Channel separation method and system

Abstract

An embodiment of the present invention provides a channel separation method and system, which includes a reconfigurable intelligent surface or relay located between a base station and a terminal, switching a reflected pilot signal to a new codebook at a given symbol position according to a preset codebook reflection coefficient.

Description

[Technical field]

[0001] FIELD OF THE DISCLOSURE Embodiments of the present invention relate to the field of communications, and more particularly to channel separation methods and systems. [Background technology]

[0002] Reconfigurable intelligent surfaces, as a low-cost wireless signal enhancement scheme, have already become a popular research direction for Beyond 5th Generation (B5G) and 6th Generation (6G) mobile communication systems. With the help of reconfigurable intelligent surfaces, the blind spot elimination of wireless signals and the capacity of hotspot areas can be greatly improved.

[0003] FIG. 1 is a schematic diagram of a channel between a base station and a terminal in the presence of a reconfigurable intelligent surface in the related art. As shown in FIG. 1, there is a direct channel H between the base station and the terminal. d and the reflection channel H through the reconfigurable intelligent surface. r If there exists a strong channel between the base station and each of the reconfigurable intelligent surface and the terminal, that is, H between the base station and the terminal d and H r If both are strong, H d and H r There are time and angle offsets in the channel estimation and demodulation performance, which may seriously affect the channel estimation and demodulation performance in some cases. At the same time, it is not possible to correctly distinguish whether the channel is directly from the base station or is reflected by the reconfigurable intelligent surface, which causes problems such as positioning errors. In existing communication systems, the separation of the direct channel and the reflected channel is not taken into consideration, so the channels received at the base station or terminal side are mixed. Summary of the Invention [Problem to be solved by the invention]

[0004] SUMMARY OF THE PRESENTLY PREFERRED EMBODIMENTS The embodiments of the present invention provide a channel separation method and system, so as to at least solve the problem of mixed channels received at the base station or terminal side in the related art. [Means for solving the problem]

[0005] According to one embodiment of the present invention, a channel separation method is provided, comprising the step of a reconfigurable intelligent surface or relay located between a base station and a terminal switching a reflected pilot signal to a new codebook at a given symbol position according to a pre-set codebook reflection coefficient.

[0006] According to another embodiment of the present invention, there is provided a channel separation system including a reconfigurable intelligent surface or relay located between a base station and a terminal and configured to switch a reflected pilot signal to a new codebook at a given symbol position according to a pre-set codebook reflection coefficient.

[0007] According to yet another embodiment of the present invention there is further provided a computer readable storage medium having stored thereon a computer program which, when executed, is configured to perform the steps of any of the above method embodiments.

[0008] According to a further embodiment of the present invention there is further provided an electronic device comprising a memory having a computer program stored therein and a processor configured to execute said computer program to perform the steps of any of the method embodiments described above. [Brief description of the drawings]

[0009] [Figure 1] 1 is a schematic diagram of a channel between a base station and a terminal in the presence of a reconfigurable intelligent surface in the related art; [Diagram 2] 4 is a flow chart of a channel separation method according to an embodiment of the present invention. [Diagram 3]1 is a block diagram of a channel separation system according to an embodiment of the present invention; [Figure 4] 4 is a flow chart of a method for channel separation in the presence of a reconfigurable intelligent surface according to an embodiment of the present invention. [Diagram 5] FIG. 2 is a schematic diagram of coefficients of a reconfigurable intelligent surface under the condition that a two-symbol pilot signal is set according to an embodiment of the present invention; [Figure 6] FIG. 2 is a schematic diagram of coefficients of a reconfigurable intelligent surface under the condition that a four-symbol pilot signal is set according to an embodiment of the present invention; [Figure 7] 4 is a flowchart of a downlink channel separation method according to an embodiment of the present invention. [Figure 8] 4 is a flowchart of an uplink channel separation method according to an embodiment of the present invention. DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS

[0010] DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS Hereinafter, the present invention will be described in detail based on the embodiments with reference to the drawings. In the related art, a reconfigurable intelligent surface or relay is a low-cost wireless signal enhancement scheme. However, as shown in FIG. 1, when a reconfigurable intelligent surface or relay exists, a direct channel H is established between the base station and the terminal. d and the reflection channel H through the reconfigurable intelligent surface. r As a result, the channels received by the receiving base station or terminal are mixed. Therefore, in an embodiment of the present invention, a channel separation method and system are provided that are applicable to the above-mentioned case where a reconfigurable intelligent surface or relay exists, and the direct channel H between the base station and the terminal is mixed. d and the channel H reflected by a reconfigurable intelligent surface r This effectively separates the two signals, improving performance in areas such as demodulation and positioning.

[0011] In this embodiment, a channel separation method is provided. Figure 2 is a flow chart of the channel separation method according to the embodiment of the present invention, as shown in Figure 2, the flow includes the following step S202:

[0012] Step S202: A reconfigurable intelligent surface or relay located between the base station and the terminal switches the reflected pilot signal to a new codebook at a given symbol position according to a preset codebook reflection coefficient.

[0013] In one exemplary embodiment, before the reconfigurable intelligent surface or relay switches the reflected pilot signal to a new codebook at a predetermined symbol position, the base station further includes a step of notifying the terminal of a configuration regarding the pilot signal, the pilot signal appearing as a set of two pilot symbols, and one or more sets of pilot symbols being configured.

[0014] In one exemplary embodiment, the two pilot symbols are consecutive symbols or are separated by at most one pilot symbol, the pilot signals of the two pilot symbols occupy the same RB, and the number of REs occupied in each RB is the same.

[0015] In one exemplary embodiment, the pilot signal is one of the following: DMRS, SSB, PRS, CSI-RS, SRS, or PTRS.

[0016] In one exemplary embodiment, the method further includes a step in which the base station sets or negotiates a parameter set on the reconfigurable intelligent surface or relay before the reconfigurable intelligent surface or relay switches a reflected pilot signal to a new codebook at a predetermined symbol position, the parameter set including at least one of a first parameter, a second parameter, and a third parameter, the first parameter being used to indicate the codebook reflection coefficient, the second parameter being used to indicate at which pilot symbol position the reconfigurable intelligent surface or relay will perform the codebook switch, and the third parameter being used to indicate the time at which the reconfigurable intelligent surface or relay will perform the codebook switch, the time including at least one of a time slot and a pilot symbol.

[0017] In one exemplary embodiment, the step of the reconfigurable intelligent surface or relay switching the reflected pilot signal to a new codebook includes a step of the reconfigurable intelligent surface or relay switching the pilot signal from an old codebook to a new codebook at one of two set pilot symbols, the new codebook being the old codebook multiplied by the codebook reflection coefficient.

[0018] In one exemplary embodiment, after switching the pilot signal of the reflected channel to a new codebook at a predetermined symbol position, after the terminal or base station receives the pilot signal, the method further includes separating a direct channel between the base station and the terminal and a reflected channel reflected by a reconfigurable intelligent surface or relay according to the codebook at different pilot symbols of the pilot signal.

[0019] In one exemplary embodiment, after separating a direct channel between a base station and a terminal and a reflected channel reflected by a reconfigurable intelligent surface or a relay, the terminal further includes a step of feeding back measurement results of the direct channel and the reflected channel individually or collectively based on measurement feedback signaling.

[0020] Through the above steps, the reconfigurable intelligent surface or relay switches the reflected pilot signal to a new codebook at a predetermined symbol position according to the preset codebook reflection coefficient, and establishes the code division of the direct channel and the reflected channel in the time domain, so that the terminal or base station can perform channel separation according to the received pilot signal, and effectively separate the direct channel and the reflected channel between the base station and the terminal. Therefore, the problem of the mixed channels received at the base station or terminal side in the prior art can be solved, and the positioning accuracy is improved, and the effect of improving the performance of the demodulation and positioning of the wireless signal and the like is achieved.

[0021] From the above description of the embodiments, those skilled in the art can understand that the method according to the above embodiment can be realized by adding a general-purpose hardware flip form required for software, and can also be realized by hardware, but in many cases, it is preferable to implement it in the former way. Based on this, the essence of the technical aspects of the present invention or a part of the contribution to the prior art can be realized in the form of a software product, and the computer software product is stored in a storage medium (e.g., a read-only memory / random access memory (ROM / RAM), a magnetic disk, an optical disk) containing a plurality of instructions that cause a terminal device (which may be a mobile phone, a computer, a server, a network device, etc.) to execute the method according to each embodiment of the present invention.

[0022] In this embodiment, a channel separation system is further provided, which is for realizing the above embodiment and preferred embodiment, and the description of the parts already described will be omitted. The term "module" used below is a combination of software and / or hardware capable of realizing a predetermined function. Although it is preferable to realize the device described in the following embodiment by software, it is also possible to realize it by hardware or a combination of software and hardware.

[0023] 3 is a block diagram of a channel separation system according to an embodiment of the present invention. As shown in FIG. 3, the system includes a reconfigurable intelligent surface or relay 10, a base station 20, and a terminal 30.

[0024] A reconfigurable intelligent surface or relay 10 is located between the base station and the terminals and is configured to switch the reflected pilot signal to a new codebook at a given symbol position according to a pre-set codebook reflection coefficient.

[0025] The base station 20 is configured to notify the terminal of settings related to the pilot signal, the pilot signal appearing as a set of two pilot symbols, and one or more sets of pilot symbols are set.

[0026] The base station 20 or the terminal 30 is further configured, after receiving the pilot signal, to separate a direct channel between the base station and the terminal and a reflected channel reflected by a reconfigurable intelligent surface or relay according to a codebook in different pilot symbols of the pilot signal.

[0027] In one exemplary embodiment, the base station is further configured to set a parameter set to the reconfigurable intelligent surface or relay or negotiate the parameter set between the reconfigurable intelligent surface or relay, the parameter set including a first parameter, a second parameter, and a third parameter, the first parameter being used to indicate the codebook reflection coefficient, the second parameter being used to indicate at which pilot symbol position the reconfigurable intelligent surface or relay will perform codebook switching, and the third parameter being used to indicate a time at which the reconfigurable intelligent surface or relay will perform codebook switching, the time including at least one of a time slot and a pilot symbol.

[0028] In one exemplary embodiment, the terminal is further configured to feed back measurement results of the direct channel and the reflected channel, either individually or jointly, based on measurement feedback signaling.

[0029] Each of the above modules can be realized in software or hardware. When realized in hardware, the above modules can all be located in the same processor, or the above modules can be located in different processors in any combination, but is not limited to these.

[0030] In order to facilitate understanding of the technical aspects provided by the present invention, the following detailed description is given in conjunction with examples of specific scenarios.

[0031] In an embodiment of the present invention, a channel separation method in the presence of a reconfigurable intelligent surface is provided, which separates a direct channel H between a base station and a terminal. d and the channel H reflected by a reconfigurable intelligent surface rIt is possible to effectively separate the channels and improve the performance of demodulation, positioning, etc. Fig. 4 is a flowchart of a channel separation method in the presence of a reconfigurable intelligent surface according to an embodiment of the present invention. As shown in Fig. 4, the method includes the following steps S401 to S405.

[0032] Step S401: The base station notifies the terminal of pilot configuration parameters. Specifically, one or more sets of pilot configuration parameters can be set, with two consecutive symbols in the time domain regarded as one set.

[0033] Step S402: The base station sets a parameter set in a Reconfigurable Intelligence Surface (RIS).

[0034] Specifically, this parameter set includes three parts: 1. The first parameter indicates the codebook reflection coefficient, which may indicate that the RIS multiplies its entire codebook by a scalar. This parameter may be pre-defined and defaults to -1.

[0035] 2. The second parameter indicates at which OFDM symbol the RIS switches its codebook. This parameter may be pre-agreed, e.g., it may typically default to switching at the second of two pilot symbols.

[0036] 3. The third parameter indicates the time slot and OFDM symbol in which the pilot signal appears.

[0037] Step S403: The base station or the terminal transmits a pilot signal, and the RIS performs codebook switching for the reflected pilot signal at the set symbol.

[0038] Specifically, the new switched codebook is the original codebook multiplied by a specified scalar, for example, a 1-bit reconfigurable intelligent surface can multiply the reconfigurable intelligent surface codebook by -1 in the second pilot symbol of the reference signal of two consecutive symbols, and other forms of codebook coefficients can also be adopted in this embodiment.

[0039] Step S404: After the terminal or base station receives the pilot signal, according to the coefficients in different symbols of the reconfigurable intelligent surface set by the base station, separate the direct channel between the base station and the terminal and the reflected channel through the reconfigurable intelligent surface, and perform operations such as channel estimation.

[0040] Step S405: If the terminal needs to report the measurement result, it doubles the resource overhead of the terminal in the existing protocol or standard to report the measurement result of the direct channel and the reflected channel respectively.

[0041] Furthermore, in this embodiment, a time domain situation in which switching of the RIS codebook coefficients can occur under the conditions where a 2-symbol pilot signal is set and where a 4-symbol pilot signal is set will also be described.

[0042] Specifically, for a two-symbol pilot, When two pilot symbols are set, the position of the pilot symbols in the time domain and the coefficients of the reconfigurable intelligent surface can be shown in Figure 5. In Figure 5, 14 symbols (i.e., symbols 0 to 13) in one slot are shown. Here, the position where the black box exists is the position where the pilot exists, and if there is -1 in the box where this symbol exists, it means that the codebook of the reconfigurable intelligent surface at the time when the symbol exists is the original codebook multiplied by -1.

[0043]

number

[0044] Specifically, for a 4-symbol pilot, When four pilot symbols are configured, the positions of the pilot symbols in the time domain and the coefficients of the reconfigurable intelligent surface can be represented in FIG.

[0045]

number

[0046] In addition, in the embodiment of the present invention, only 2-symbol and 4-symbol DMRS settings are shown, but there are various combinations of actual setting types, and the purpose of the embodiment of the present invention is to realize channel separation by having the RIS multiply its entire codebook by one coefficient and construct code division of the direct channel and the reflected channel in the time domain.

[0047] The present invention further provides a downlink channel separation method. Figure 7 is a flow chart of a downlink channel separation method according to an embodiment of the present invention, as shown in Figure 7, the method includes the following steps S701 to S705.

[0048] Step S701: The base station notifies the terminal of the setting parameters of the downlink pilot signal.

[0049] Specifically, the setting parameters of the pilot signal may be set in one or more sets, with each set being two consecutive symbols in the time domain. For example, it is assumed that pilot signals are set in symbol 2 and symbol 3, and the parameters set by the base station to the terminal indicate that the reconfigurable intelligent surface multiplies the entire codebook from symbol 3 by -1, or the base station and the terminal agree to multiply the second pilot symbol of the two consecutive pilot symbols by -1. The base station may also set feedback from the terminal, and may request to simultaneously feed back channel measurement results of the direct channel and the reflected channel, including but not limited to parameters such as Reference Signal Receiving Power (RSRP), delay, signal-to-interference power and noise ratio.

[0050] Step S702: The base station sets a parameter set in the RIS. Specifically, this parameter set includes three parts:

[0051] 1. The first parameter indicates the codebook reflection coefficient, which may indicate that the RIS or relay multiplies its entire codebook by a scalar, here assumed to be -1. This parameter may be pre-negotiated and is not set by default.

[0052] 2. The second parameter indicates which symbols the RIS should switch its codebook between, for example multiplying the entire codebook by -1 starting at symbol 3. This parameter may be pre-negotiated and is not set by default.

[0053] 3. The third parameter indicates the switching time of the reconfigurable intelligent surface according to the instruction of the base station, which may be a specific time slot, a specific index of the time slot and OFDM symbol, or a specific time, but is not specifically limited thereto herein.

[0054] Step S703: The base station transmits a downlink pilot signal, and the reconfigurable intelligent surface multiplies the entire codebook at the starting position where symbol 3 is received by −1.

[0055] Step S704: After receiving the pilot signal, the terminal performs channel separation.

[0056]

number

[0057] Step S705: If the base station sends signaling to the terminal requesting the terminal to feed back the relevant measurement values ​​of the direct channel and the reflected channel respectively, the terminal needs about twice the resource overhead to feed back. The feedback of the direct channel and the reflected channel may be performed jointly or separately.

[0058] In this embodiment, the base station sets parameters in the terminal, and the setting parameters should include the setting parameters of the downlink pilot signal notified by the base station to the terminal, and the pilot signal should appear in two OFDM symbols, preferably consecutive symbols, as a set, and one or more sets can be set. Considering the switching restrictions of the RIS, if switching cannot be realized in consecutive symbols, the two pilot symbols are separated by a maximum of one symbol. The pilots of the two symbols occupy the same RE and RB. The pilots here may be DMRS, SSB, PRS, CSI-RS, SRS, PTRS, etc., and all of them should appear in both symbols simultaneously.

[0059] In this embodiment, a parameter indicating the switching coefficient of the RIS codebook is set in the terminal, which is set to -1 by default and can be omitted. New codebook after RIS switching = the set coefficient multiplied by the old codebook of RIS.

[0060] In this embodiment, when the base station requests the terminal to perform feedback of the direct channel and the reflected channel, such as CSI feedback including, for example, RSRP, signal-to-interference power and noise ratio, etc., it is necessary to configure signaling indicating whether the feedback here is for the direct channel, the reflected channel, or both. The direct channel and the reflected channel may be grouped and fed back separately, or may be fed back together.

[0061] In this embodiment, the base station sets parameters in the RIS, and these setting parameters must include:

[0062] Parameter for codebook reflection coefficient. This parameter can indicate that the RIS multiplies its entire codebook by a scalar, and is -1 by default. This configuration parameter is optional. When the base station transmits a downlink pilot signal, the reconfigurable intelligent surface needs to switch to a new codebook at a given symbol position, and the new codebook = configured reflection coefficient * old codebook.

[0063] A parameter indicating in which OFDM symbol the RIS switches codebooks. The symbol position where the codebooks are switched may also be pre-negotiated. Due to the large number of pilot types, the agreed default value should only be for commonly used pilot signals. Due to the variety of pilot types and settings, this parameter is most often not the default.

[0064] A parameter indicating the time when the base station instructs the reconfigurable intelligent surface to switch. This time may be a specific time slot, a specific index of the time slot+OFDM symbol, or a specific time, but is not specifically limited here.

[0065] In this embodiment, when the base station requests the terminal to feed back the channel measurement result, the feedback resource overhead needs to be increased by twice the original amount when both the direct channel and the reflected channel are fed back. If they cannot be distinguished, the terminal needs to inform the base station whether the feedback is the measurement result from the direct channel, the measurement result from the reflected channel, the measurement result fed back by both channels, or the measurement result from the combined channel of both channels.

[0066] An uplink channel separation method is further provided in an embodiment of the present invention. Figure 8 is a flow chart of an uplink channel separation method according to an embodiment of the present invention, as shown in Figure 8, it includes the following steps S801 to S804.

[0067] Step S801: The base station notifies the terminal of the setting parameters of the downlink pilot signal.

[0068] Specifically, one or more sets of pilot signals may be set, with two consecutive symbols in the time domain being regarded as one set. Assume that pilots are set in symbol 2 and symbol 3.

[0069] Step S802: The base station sets a parameter set in the RIS. Specifically, this parameter set includes three parts:

[0070] 1. The first parameter indicates the codebook reflection coefficient, which can indicate that the RIS will multiply its entire codebook by a scalar. It does not need to be set here and defaults to -1.

[0071] 2. The second parameter indicates which symbols the RIS should switch its codebook between, for example multiplying the entire codebook by -1 starting at symbol 3. This parameter may be pre-negotiated and is not set by default.

[0072] 3. The third parameter indicates the time when the base station instructs the reconfigurable intelligent surface to switch, which may be a specific time slot, a specific index of the time slot and OFDM symbol, or a specific time, but is not specifically limited here.

[0073] Step S803: The terminal transmits an uplink pilot signal, and the reconfigurable intelligent surface multiplies the entire codebook at the start position where symbol 3 is received by −1.

[0074] Step S804: After receiving the pilot signal, the base station performs channel separation.

[0075]

number

[0076] In this embodiment, the base station notifies the terminal of the configuration parameters of the uplink pilot signal. The pilots need to appear in two OFDM symbols, preferably consecutive symbols, as a set, and one or more sets can be configured. Considering the switching restrictions of the RIS, if switching cannot be realized in consecutive symbols, the two pilot symbols are separated by a maximum of one symbol. The pilots of the two symbols occupy the same RE and RB. The pilots here may be DMRS, SRS, etc., and they all need to appear in both symbols simultaneously.

[0077] In this embodiment, the base station configures a parameter set in the RIS, and these configuration parameters must include the following:

[0078] Parameter for codebook reflection coefficient. This parameter can indicate that the RIS multiplies its entire codebook by a scalar, and is -1 by default. This configuration parameter is optional. When the base station transmits an uplink pilot signal, the reconfigurable intelligent surface needs to switch to a new codebook at a given symbol position, where new codebook = configured reflection coefficient * old codebook.

[0079] A parameter indicating in which OFDM symbol the RIS switches codebooks. The symbol position where the codebooks are switched may also be pre-negotiated. Due to the large number of pilot types, the agreed default value should only be for commonly used pilot signals. Due to the variety of pilot types and settings, this parameter is most often not the default.

[0080] A parameter indicating the time when the base station instructs the reconfigurable intelligent surface to switch, which may be a specific time slot, a specific index of the time slot and OFDM symbol, or a specific time, but is not specifically limited thereto herein.

[0081] In addition, the RIS in all the above embodiments of the present invention may be replaced with a relay, and for specific examples, refer to the examples described in the above embodiments and exemplary embodiments, and detailed description will be omitted in this embodiment.

[0082] According to the above-mentioned embodiment of the present invention, through the signaling interaction between the base station, the reconfigurable intelligent surface and the terminal, and the codebook modification of the reconfigurable intelligent surface, code division in the time domain of the direct channel and the reflected channel is generated at the receiving side, so that the direct channel and the reflected channel passing through the reconfigurable intelligent surface can be simply and effectively separated, thereby achieving the objectives such as improving throughput and positioning accuracy.

[0083] In an embodiment of the present invention, there is further provided a computer readable storage medium having a computer program stored thereon, the computer program being configured, when executed, to perform the steps of any of the method embodiments described above.

[0084] In one exemplary embodiment, the computer-readable storage medium may include, but is not limited to, various media capable of storing computer programs, such as a USB, a Read-Only Memory (ROM), a Random Access Memory (RAM), a portable HDD, a magnetic disk, or an optical disk.

[0085] In an embodiment of the present invention, there is further provided an electronic device, the electronic device including a memory and a processor, the memory storing a computer program, the processor being configured to execute the computer program to perform the steps of any of the method embodiments described above.

[0086] In one exemplary embodiment, the electronic device may further include a transmission device and an input / output device, the transmission device being connected to the processor, and the input / output device being connected to the processor.

[0087] For specific examples of this embodiment, reference may be made to the examples described in the above embodiments and exemplary embodiments, and detailed description will be omitted in this embodiment.

[0088] Those skilled in the art will appreciate that each module or step of the above-described embodiments of the present invention can be implemented by a general-purpose computing device, can be centralized in one computing device, or can be distributed across a network of multiple computing devices, can be implemented by a computing device-executable program code that is stored in a storage device and executed by the computing device, and the steps disclosed or described can be executed in a different order than described herein, or can be fabricated into separate integrated circuit modules, or multiple modules or steps therein can be integrated into a single integrated circuit module. Thus, the present invention is not limited to a specific combination of hardware and software.

[0089] The above is merely a preferred embodiment of the present invention, and is not intended to limit the present invention. Those skilled in the art can make various modifications and variations to the present invention. All modifications, equivalent replacements, improvements, etc. within the principle of the present invention are included in the protection scope of the present invention.

Claims

1. An intelligent reflecting surface (IRS) or relay located between the base station and the terminal switches the reflected pilot signal to a new codebook at a predetermined symbol position according to a preset codebook reflection coefficient; The channel separation method includes:

2. before the reconfigurable intelligent surface or relay switches the reflected pilot signal to a new codebook at a given symbol position; 2. The method of claim 1, further comprising a step of the base station notifying the terminal of a setting regarding the pilot signal, the pilot signal appearing as a set of two pilot symbols, and one or more sets of pilot symbols being set.

3. 3. The method of claim 2, wherein the two pilot symbols are consecutive symbols or are separated by at most one pilot symbol, the pilot signals of the two pilot symbols occupy the same RB, and the number of REs occupied in each RB is the same.

4. The method of claim 1 , wherein the pilot signal is one of a DMRS, an SSB, a PRS, and a CSI-RS.

5. before the reconfigurable intelligent surface or relay switches the reflected pilot signal to a new codebook at a given symbol position; The method further includes a step of the base station setting or negotiating a parameter set on the reconfigurable intelligent surface or relay, the parameter set including at least any of a first parameter, a second parameter, and a third parameter; the first parameter is used to indicate the codebook reflection coefficient; a second parameter is used to indicate at which pilot symbol the reconfigurable intelligent surface or relay should switch codebooks; 3. The method of claim 2, wherein a third parameter is used to indicate a time at which the reconfigurable intelligent surface or relay performs a codebook switch, the time including at least one of a time slot and a pilot symbol.

6. The step of the reconfigurable intelligent surface or relay switching the reflected pilot signal to a new codebook comprises:

6. The method of claim 5, further comprising the step of: the reconfigurable intelligent surface or relay switching the pilot signal from an old codebook to a new codebook at one of two set pilot symbols, the new codebook being the old codebook multiplied by the codebook reflection coefficient.

7. At a given symbol position, after switching the reflected pilot signal to a new codebook, 6. The method of claim 5, further comprising: after the terminal or base station receives the pilot signal, separating a direct channel between the base station and the terminal and a reflected channel reflected by a reconfigurable intelligent surface or relay according to a codebook in different pilot symbols of the pilot signal.

8. After separating the direct channel between the base station and the terminal and the reflected channel reflected by the reconfigurable intelligent surface or relay, The method of claim 7 , further comprising the terminal feeding back measurement results of the direct channel and the reflected channel individually or jointly based on measurement feedback signaling.

9. a reconfigurable intelligent surface or relay located between the base station and the terminal and configured to switch the reflected pilot signal to a new codebook at a given symbol position according to a preset codebook reflection coefficient; A channel separation system including:

10. A base station configured to notify the terminal of a setting related to the pilot signal, the pilot signal appearing as a set of two pilot symbols, and the base station further includes one or more sets of pilot symbols configured. The system of claim 9.

11. the base station further configured to set a parameter set on the reconfigurable intelligent surface or relay or negotiate the parameter set with the reconfigurable intelligent surface or relay, the parameter set including a first parameter, a second parameter, and a third parameter; the first parameter is used to indicate the codebook reflection coefficient; a second parameter is used to indicate at which pilot symbol the reconfigurable intelligent surface or relay should switch codebooks; a third parameter is used to indicate a time when the reconfigurable intelligent surface or relay performs a codebook switch, the time including at least one of a time slot and a pilot symbol; The system of claim 10.

12. Further comprising a terminal, The base station or the terminal is further configured to separate a direct channel between the base station and the terminal and a reflected channel reflected by a reconfigurable intelligent surface or a relay according to a codebook in different pilot symbols of the pilot signal after receiving the pilot signal. The system of claim 9.

13. The terminal is further configured to feed back measurement results of the direct channel and the reflected channel individually or jointly based on measurement feedback signaling. The system of claim 12.

14. A computer-readable storage medium having stored thereon a computer program which, when executed by a processor, implements the steps of the method according to any one of claims 1 to 8.

15. 9. An electronic device comprising a memory, a processor and a computer program stored in the memory and executable on the processor, the processor implementing the steps of the method according to any one of claims 1 to 8 when it executes the computer program.

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