Channel separation method and system

Abstract

The embodiment of the present application provides a channel separation method and system. The method comprises the following steps: an intelligent reflecting surface or a repeater between a base station and a terminal switches pilot signals to be reflected to a new codebook at a specified symbol position based on a pre-configured codebook reflection coefficient. According to the present application, the intelligent reflecting surface or the repeater switches the pilot signals to be reflected to the new codebook at the specified symbol position based on the pre-configured codebook reflection coefficient, and the code division of the time domain direct channel and the reflection channel is constructed, so that the direct channel and the reflection channel between the base station and the terminal are effectively separated, and the performance of demodulation and positioning of wireless signals is improved.

Description

Technical Field

[0001] The embodiments of the present invention relate to the field of communications, and more specifically, to a channel separation method and system. Background Technology

[0002] As a low-cost wireless signal enhancement solution, smart reflectors have become a hot research topic in both 5G and 6G mobile communication systems. With the assistance of smart reflectors, the coverage of blind spots and the rank of signals in hotspot areas can be significantly improved.

[0003] Figure 1 This is a schematic diagram of the channel between the base station and the terminal when a smart reflective surface exists in related technologies, such as... Figure 1 As shown, there is a direct channel H between the base station and the terminal. d and the reflection channel H that has passed through the intelligent reflective surface r When there are strong channels between the base station and both the smart reflector and the terminal, i.e., the H between the base station and the terminal... d and H r When both are relatively strong, H d and H r There will be time and angle offsets, which may seriously affect channel estimation and demodulation performance in some scenarios. At the same time, because it is impossible to correctly distinguish whether the channel comes directly from the base station or is reflected by the intelligent reflector, it will lead to positioning errors and other problems. Existing communication systems have not yet considered the separation of direct and reflected channels, resulting in the base station or terminal receiving mixed channels. Summary of the Invention

[0004] This invention provides a channel separation method and system to at least solve the problem in related technologies where the channels received at the base station or terminal side are mixed.

[0005] According to an embodiment of the present invention, a channel separation method is provided, comprising: a smart reflector or repeater located between a base station and a terminal, switching the reflected pilot signal to a new codebook at a specified symbol position based on a pre-configured codebook reflection coefficient.

[0006] In an exemplary embodiment, before the smart reflector or repeater switches the reflected pilot signal to a new codebook at a specified symbol position, the method further includes: the base station notifying the terminal about the configuration of the pilot signal, wherein the pilot signal appears in groups of two pilot symbols, and one or more groups of pilot symbols are configured.

[0007] In an 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 resource block (RB), and the number of resource elements (RE) occupied on each RB is the same.

[0008] In one exemplary embodiment, the pilot signal is one of the following: demodulation reference signal (DMRS), synchronization signal block (SSB), positioning reference signal (PRS), channel state information reference signal (CSI-RS), sounding reference signal (SRS), and phase tracking reference signal (PTRS).

[0009] In an exemplary embodiment, before the smart reflector or repeater switches the reflected pilot signal to a new codebook at a specified symbol position, the method further includes: the base station configuring or agreeing on a parameter set for the smart reflector or repeater, wherein the parameter set includes at least one of the following: a first parameter, a second parameter, and a third parameter; wherein the first parameter is used to indicate the codebook reflection coefficient; the second parameter is used to indicate at which pilot symbol positions the smart reflector or repeater performs codebook switching; and the third parameter is used to indicate the time for the smart reflector or repeater to perform codebook switching, wherein the time includes at least one of the following: a time slot and a pilot symbol.

[0010] In an exemplary embodiment, the smart reflector or repeater switches the reflected pilot signal to a new codebook by: the smart reflector or repeater switching the pilot signal from an old codebook to a new codebook on one of two configured pilot symbols, wherein the new codebook is the old codebook multiplied by the codebook reflection coefficient.

[0011] In an exemplary embodiment, after switching the pilot signal of the reflection channel to a new codebook at a specified symbol position, the method further includes: after receiving the pilot signal, the terminal or base station, based on the codebook on different pilot symbols of the pilot signal, separating the direct channel between the base station and the terminal and the reflection channel reflected by the smart reflector or repeater.

[0012] In an exemplary embodiment, after separating the direct channel between the base station and the terminal and the reflected channel reflected by the smart reflector or repeater, the method further includes: the terminal feeding back or jointly feeding back the measurement results of the direct channel and the reflected channel based on measurement feedback signaling.

[0013] According to another embodiment of the present invention, a channel separation system is provided, comprising: in an exemplary embodiment, a smart reflector or repeater, located between a base station and a terminal, for switching a reflected pilot signal to a new codebook at a predetermined symbol position according to a pre-configured codebook reflection coefficient.

[0014] In one exemplary embodiment, the system further includes a base station for notifying the terminal about the configuration of the pilot signal, wherein the pilot signal appears in groups of two pilot symbols, and is configured with one or more groups of pilot symbols.

[0015] In one exemplary embodiment, the system further includes: the base station, which is configured to configure a parameter set for the smart reflector or repeater, or agree on the parameter set with the smart reflector or repeater, wherein the parameter set includes: a first parameter, a second parameter, and a third parameter; wherein the first parameter is used to indicate the codebook reflection coefficient; the second parameter is used to indicate at which pilot symbol positions the smart reflector or repeater performs codebook switching; and the third parameter is used to indicate the time at which the smart reflector or repeater performs codebook switching, wherein the time includes at least one of the following: time slot, pilot symbol.

[0016] In one exemplary embodiment, the system further includes a terminal. The base station or terminal is further configured to, upon receiving the pilot signal, separate the direct channel between the base station and the terminal and the reflected channel reflected by the intelligent reflector or repeater according to the codebook on different pilot symbols of the pilot signal.

[0017] In an exemplary embodiment, the terminal is further configured to feed back or jointly feed back the measurement results of the direct channel and the reflection channel based on measurement feedback signaling.

[0018] According to yet another embodiment of the present invention, a computer-readable storage medium is also provided, wherein a computer program is stored therein, wherein the computer program is configured to perform the steps in any of the above method embodiments when executed.

[0019] According to yet another embodiment of the present invention, an electronic device is also provided, including a memory and a processor, wherein the memory stores a computer program and the processor is configured to run the computer program to perform the steps in any of the above method embodiments.

[0020] Through this invention, since the intelligent reflector or repeater will switch the reflected pilot signal to a new codebook at a specified symbol position based on the pre-configured codebook reflection coefficient, and construct the code division of the time-domain direct channel and the reflection channel, the direct channel and the reflection channel between the base station and the terminal are effectively separated, thereby improving the performance of wireless signal demodulation and positioning. Attached Figure Description

[0021] Figure 1 This is a schematic diagram of the channel between the base station and the terminal when a smart reflective surface exists in related technologies;

[0022] Figure 2 This is a flowchart of a channel separation method according to an embodiment of the present invention;

[0023] Figure 3 This is a structural block diagram of a channel separation system according to an embodiment of the present invention;

[0024] Figure 4 This is a flowchart of a channel separation method in the presence of a smart reflector according to an embodiment of the present invention;

[0025] Figure 5 This is a schematic diagram of the intelligent reflector coefficient under the configuration of a 2-symbol pilot signal according to an embodiment of the present invention;

[0026] Figure 6 This is a schematic diagram of the intelligent reflector coefficient under the configuration of 4-symbol pilot signals according to an embodiment of the present invention;

[0027] Figure 7 This is a flowchart of a downlink channel separation method according to an embodiment of the present invention;

[0028] Figure 8 This is a flowchart of an uplink channel separation method according to an embodiment of the present invention. Detailed Implementation

[0029] The embodiments of the present invention will be described in detail below with reference to the accompanying drawings and examples.

[0030] In related technologies, smart reflectors or repeaters are a low-cost solution for enhancing wireless signals, but... Figure 1 As shown, in the presence of a smart reflector or repeater, there is a direct channel H between the base station and the terminal. d and the reflection channel H through the intelligent reflective surface r This results in the base station or terminal receiving mixed channels. Therefore, embodiments of the present invention provide a channel separation method and system, which, when the aforementioned intelligent reflector or repeater is present, can effectively separate the direct channel H between the base station and the terminal. d and the channel H reflected by the intelligent reflectorr This improves demodulation and positioning performance.

[0031] This embodiment provides a channel separation method. Figure 2 This is a flowchart of a channel separation method according to an embodiment of the present invention, such as... Figure 2 As shown, the process includes the following steps:

[0032] In step S202, the intelligent reflector or repeater located between the base station and the terminal switches the reflected pilot signal to a new codebook at a specified symbol position based on the pre-configured codebook reflection coefficient.

[0033] In an exemplary embodiment, before the smart reflector or repeater switches the reflected pilot signal to a new codebook at a specified symbol position, the method further includes: the base station notifying the terminal about the configuration of the pilot signal, wherein the pilot signal appears in groups of two pilot symbols, and one or more groups of pilot symbols are configured.

[0034] In an 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 on each RB is the same.

[0035] In one exemplary embodiment, the pilot signal is one of the following: DMRS, SSB, PRS, CSI-RS, SRS, PTRS.

[0036] In an exemplary embodiment, before the smart reflector or repeater switches the reflected pilot signal to a new codebook at a specified symbol position, the method further includes: the base station configuring or agreeing on a parameter set for the smart reflector or repeater, wherein the parameter set includes at least one of the following: a first parameter, a second parameter, and a third parameter; wherein the first parameter is used to indicate the codebook reflection coefficient; the second parameter is used to indicate at which pilot symbol positions the smart reflector or repeater performs codebook switching; and the third parameter is used to indicate the time for the smart reflector or repeater to perform codebook switching, wherein the time includes at least one of the following: a time slot and a pilot symbol.

[0037] In an exemplary embodiment, the smart reflector or repeater switches the reflected pilot signal to a new codebook by: the smart reflector or repeater switching the pilot signal from an old codebook to a new codebook on one of two configured pilot symbols, wherein the new codebook is the old codebook multiplied by the codebook reflection coefficient.

[0038] In an exemplary embodiment, after switching the pilot signal of the reflection channel to a new codebook at a specified symbol position, the method further includes: after receiving the pilot signal, the terminal or base station, based on the codebook on different pilot symbols of the pilot signal, separating the direct channel between the base station and the terminal and the reflection channel reflected by the smart reflector or repeater.

[0039] In an exemplary embodiment, after separating the direct channel between the base station and the terminal and the reflected channel reflected by the smart reflector or repeater, the method further includes: the terminal feeding back or jointly feeding back the measurement results of the direct channel and the reflected channel based on measurement feedback signaling.

[0040] Through the above steps, the intelligent reflector or repeater switches the reflected pilot signal to a new codebook at the specified symbol position based on the pre-configured codebook reflection coefficients. This allows the terminal or base station to perform channel separation based on the received pilot signal. Therefore, the problem of mixed channels received at the base station or terminal side in related technologies can be solved, improving positioning accuracy.

[0041] Through the above description of the embodiments, those skilled in the art can clearly understand that the methods according to the above embodiments can be implemented by means of software plus necessary general-purpose hardware platforms. Of course, they can also be implemented by hardware, but in many cases the former is a better implementation method. Based on this understanding, the technical solution of the present invention, or the part that contributes to the prior art, can be embodied in the form of a software product. This computer software product is stored in a storage medium (such as read-only memory / random access memory (ROM / RAM), magnetic disk, optical disk), and includes several instructions to cause a terminal device (which may be a mobile phone, computer, server, or network device, etc.) to execute the methods described in the various embodiments of the present invention.

[0042] This embodiment also provides a channel separation system, which is used to implement the above embodiments and preferred embodiments; details already described will not be repeated. As used below, the term "module" can refer to a combination of software and / or hardware that implements a predetermined function. Although the apparatus described in the following embodiments is preferably implemented in software, hardware implementation, or a combination of software and hardware, is also possible and contemplated.

[0043] Figure 3 This is a structural block diagram of a channel separation system according to an embodiment of the present invention, such as... Figure 3 As shown, the system includes a smart reflector or repeater 10, a base station 20, and a terminal 30.

[0044] The intelligent reflector or repeater 10 is located between the base station and the terminal and is used to switch the reflected pilot signal to a new codebook at a specified symbol position according to the pre-configured codebook reflection coefficient.

[0045] Base station 20 is used to notify the terminal about the configuration of the pilot signal, wherein the pilot signal appears in groups of two pilot symbols, and one or more groups of pilot symbols are configured.

[0046] Terminal 30, the base station or terminal, is further configured to, after receiving the pilot signal, separate the direct channel between the base station and the terminal and the reflected channel reflected by the intelligent reflector or repeater according to the codebook on the different pilot symbols of the pilot signal.

[0047] In one exemplary embodiment, the system further includes: the base station, which is configured to configure a parameter set for the smart reflector or repeater, or agree on the parameter set with the smart reflector or repeater, wherein the parameter set includes: a first parameter, a second parameter, and a third parameter; wherein the first parameter is used to indicate the codebook reflection coefficient; the second parameter is used to indicate at which pilot symbol positions the smart reflector or repeater performs codebook switching; and the third parameter is used to indicate the time at which the smart reflector or repeater performs codebook switching, wherein the time includes at least one of the following: time slot, pilot symbol.

[0048] In an exemplary embodiment, the terminal is further configured to feed back or jointly feed back the measurement results of the direct channel and the reflection channel based on measurement feedback signaling.

[0049] It should be noted that the above modules can be implemented by software or hardware. For the latter, they can be implemented in the following ways, but are not limited to: all the above modules are located in the same processor; or, the above modules are located in different processors in any combination.

[0050] To facilitate understanding of the technical solutions provided by this invention, detailed descriptions will be given below in conjunction with specific scenario embodiments.

[0051] This invention provides a channel separation method in the presence of a smart reflector, which can effectively separate the direct channel H between the base station and the terminal. d and the channel H reflected by the intelligent reflector r This improves demodulation and positioning performance. Figure 4 This is a flowchart of a channel separation method with a smart reflector according to an embodiment of the present invention, such as... Figure 4 As shown, the method includes the following steps:

[0052] Step S401: The base station notifies the terminal of the configuration parameters of the pilot.

[0053] Specifically, the pilot configuration parameters are grouped into two consecutive symbols in the time domain, and one or more groups can be configured.

[0054] Step S402: The base station configures the parameter set for the Reconfigurable Intelligence Surface (RIS).

[0055] Specifically, this parameter set contains three parts:

[0056] 1. The first parameter indicates the codebook reflection coefficient. This parameter can indicate the RIS codebook as a whole multiplied by a scalar. This parameter can also be predefined, and the default value is -1.

[0057] 2. The second parameter indicates on which Orthogonal Frequency Division Multiplexing (OFDM) symbols the RIS codebook switches over. This parameter can also be predefined. For example, it can usually be defaulted to switching on the second symbol of two pilot symbols.

[0058] 3. The third parameter indicates the time slot and OFDM symbol of the pilot signal.

[0059] Step S403: The base station or terminal transmits a pilot signal, and the RIS switches the codebook of the reflected pilot signal on the configured symbols.

[0060] Specifically, the new switching codebook is the original codebook multiplied by a specified scalar. For example, for a 1-bit smart reflector, the codebook of the smart reflector can be multiplied by -1 on the second pilot symbol of the reference signal of two consecutive symbols. In this embodiment, other forms of codebook coefficients can also be used.

[0061] Step S404: After receiving the pilot signal, the terminal or base station separates the direct channel between the base station and the terminal and the reflected channel through the intelligent reflector according to the coefficients of the intelligent reflector configured by the base station in different symbols, and then performs channel estimation and other operations.

[0062] Step S405: If the terminal needs to report the measurement results, the terminal's resource overhead on the existing protocol or standard will double, and the measurement results of the direct channel and the reflection channel will be reported separately.

[0063] Furthermore, this embodiment also provides the possible time-domain scenarios of RIS codebook coefficient switching under 2-symbol pilot configuration and 4-symbol pilot signal configuration.

[0064] Specifically, 2-symbol pilot:

[0065] When two pilot symbols are configured, the time-domain position of one pilot symbol and the smart reflector coefficient can be used. Figure 5 express, Figure 5 The diagram shows 14 symbols (symbols 0 to 13) in a slot. The black box indicates the location of the pilot signal. If the box containing the symbol contains -1, it means that the codebook of the smart reflector at that time is the original codebook multiplied by -1.

[0066] If the direct channel between the base station and the terminal obtained after channel separation is H d The channel between the base station and the terminal, reflected by the intelligent reflector, is H. f ,So:

[0067] Figure 5 (a) and Figure 5 The synthesis channel in (b) can be represented as H d +H f

[0068] Figure 5 (c) The combined channel of symbols 0 and 1 can be represented as H d +H f The synthesized channel of symbols 4 to 13 can be represented as H d -H f .

[0069] Figure 5 (d) The combined channel of symbols 0 and 1 can be represented as H d -H f The synthesized channel of symbols 4 to 13 can be represented as H d +H f .

[0070] Specifically, 4-symbol pilots:

[0071] When four pilot symbols are configured, the time-domain position of one pilot symbol and the smart reflector coefficient can be used. Figure 6 express.

[0072] Figure 6 (a) Figure 6 (b) Figure 6 (c) Figure 6 The synthesis channel in (d) can be represented as H d +H f

[0073] Figure 6 The composite channel of symbols 0, 1, 12, and 13 in (e) can be represented as H d +H fThe synthesized channel of symbols 4 to 9 can be represented as H d -H f .

[0074] Figure 6 (f) The composite channel of symbols 0, 1, 12, and 13 can be represented as H d -H f The synthesized channel of symbols 4 to 9 can be represented as H d +H f .

[0075] It should be noted that only 2-symbol and 4-symbol DMRS configurations are shown in the embodiments of the present invention. There are many other combinations of actual configuration types. The purpose of the embodiments of the present invention is to construct the code division of the time-domain direct channel and the reflection channel by multiplying the entire RIS codebook by a coefficient, thereby achieving channel separation.

[0076] This invention also provides a downlink channel separation method. Figure 7 This is a flowchart of a downlink channel separation method according to an embodiment of the present invention, such as... Figure 7 As shown, the method includes the following steps:

[0077] Step S701: The base station notifies the terminal of the configuration parameters of the downlink pilot signal.

[0078] Specifically, the configuration parameters of the pilot signals are grouped in the time domain into two consecutive symbols. One or more groups can be configured. For example, assuming pilot signals are configured for symbols 2 and 3, the base station may instruct the intelligent reflector to multiply the entire codebook starting from symbol 3 by -1 in the parameters configured for the terminal. Alternatively, the base station and terminal may agree that the second pilot symbol of two consecutive pilot symbols is multiplied by -1. The base station can also configure the terminal's feedback, such as requiring simultaneous feedback of channel measurement results for both the direct channel and the reflected channel, including but not limited to parameters such as Reference Signal Receiving Power (RSRP), delay, and signal-to-cold ratio.

[0079] Step S702: The base station configures the parameter set for the RIS.

[0080] Specifically, this parameter set contains two or three parts:

[0081] 1. The first parameter indicates the codebook reflection coefficient. This parameter can indicate the RIS or repeater codebook multiplied by a scalar, which is assumed to be -1 here. This parameter can be agreed upon in advance and is not configured by default.

[0082] 2. The second parameter indicates which symbols the RIS codebook switches between, such as multiplying the entire codebook by -1 starting from symbol 3. This parameter can also be predefined and is not configured by default.

[0083] 3. The third parameter indicates the time when the base station needs to switch to the smart reflector. This time can be a specific time slot, a specific number of the time slot and OFDM symbol, or a specific time. There are no specific limitations here.

[0084] Step S703: The base station transmits a downlink pilot signal, and the smart reflector multiplies the entire codebook by -1 at the starting position of received symbol 3.

[0085] Step S704: After receiving the pilot signal, the terminal performs channel separation.

[0086] Specifically, assume that the pilot signals obtained by dividing the pilot signals of symbol 2 and symbol 3 by their respective mother codes are H and H respectively. ls2 H ls3 Then the direct channel between the base station and the terminal can be represented as (H ls2 +H ls3 The channel between the base station and the terminal, reflected by the intelligent reflector, can be represented as (H) / 2. ls2 -H ls3 ) / 2. The obtained direct and reflected channels can be used for subsequent channel estimation, positioning, and other operations.

[0087] Step S705: If the base station sends a signaling request to the terminal to provide feedback on the relevant measurements of the direct channel and the reflection channel respectively, the terminal needs to provide feedback at approximately twice the resource overhead. Feedback on the direct channel and the reflection channel can be provided jointly or separately.

[0088] In this embodiment, the base station configures parameters for the terminal. These configuration parameters need to include: configuration parameters for the downlink pilot signal notified to the terminal by the base station. The pilot signal needs to appear in groups of two OFDM symbols, preferably consecutive symbols. One or more groups can be configured. Considering the handover limitations of RIS, if handover on consecutive symbols cannot be achieved, then the two pilot symbols should be separated by at most one symbol. The pilots of the two symbols should occupy the same RE and RB. The pilots here can be DMRS, SSB, PRS, CSI-RS, SRS, PTRS, etc., and all of them need to appear on two symbols simultaneously.

[0089] In this embodiment, a parameter is configured for the terminal to indicate the coefficient for RIS codebook switching. The default value is -1, which can be omitted. The new codebook for RIS switching is equal to the configured coefficient multiplied by the old RIS codebook.

[0090] In this embodiment, if the base station requires the terminal to provide feedback on the direct channel and the reflection channel, such as CSI feedback, including RSRP, signal-to-dryness ratio, etc., then a signaling instruction needs to be configured to indicate whether the feedback is on the direct channel, the reflection channel, or both; the direct channel and the reflection channel can be fed back separately in groups, or they can be fed back together.

[0091] In this embodiment, the base station configures parameters for the RIS, and these configuration parameters need to include:

[0092] A parameter related to the codebook reflection coefficient, which indicates that the entire RIS codebook is multiplied by a scalar. The default value is -1, and this configuration parameter can be omitted. When the base station reflects downlink pilot signals, the intelligent reflector needs to switch to a new codebook at the specified symbol position. The new codebook = configured reflection coefficient * old codebook.

[0093] One parameter needs to indicate in which OFDM symbols the RIS switches the codebook, and the symbol positions for switching the codebook can also be agreed upon in advance. Since there are many types of pilots, the agreed-upon default values ​​should only apply to commonly used pilot signals. Due to the diversity of pilot types and configurations, this parameter cannot be omitted in most cases.

[0094] One parameter requires the base station to indicate the time when the smart reflector needs to switch. This time can be a specific time slot, a time slot with a specific OFDM symbol, or a specific time. There are no specific limitations here.

[0095] In this embodiment, if the base station requires the terminal to provide feedback on channel measurement results, the resource overhead for feedback needs to be doubled when both the direct channel and the reflected channel are fed back simultaneously. If the difference cannot be distinguished, the terminal needs to inform the base station whether its feedback comes from the measurement results of the direct channel, the reflected channel, either separately or a composite of both.

[0096] This invention also provides an uplink channel separation method. Figure 8 This is a flowchart of an uplink channel separation method according to an embodiment of the present invention, such as... Figure 8 As shown, the method includes the following steps:

[0097] Step S801: The base station notifies the terminal of the configuration parameters of the downlink pilot signal.

[0098] Specifically, the pilot signals are configured in the time domain in groups of two consecutive symbols. One or more groups can be configured. For example, pilot signals are configured in symbols 2 and 3.

[0099] Step S802: The base station configures the parameter set for the RIS.

[0100] Specifically, this parameter set contains three parts:

[0101] 1. The first parameter indicates the codebook reflection coefficient. This parameter can indicate the RIS codebook multiplied by a scalar. It can also be left unconfigured and defaults to -1.

[0102] 2. The second parameter indicates which symbols the RIS codebook switches between, such as multiplying the entire codebook by -1 starting from symbol 3. This parameter can also be predefined and is not configured by default.

[0103] 3. The third parameter indicates the time when the base station needs to switch to the smart reflector. This time can be a specific time slot, a specific number of the time slot and OFDM symbol, or a specific time. There are no specific limitations here.

[0104] Step S803: The terminal transmits an uplink pilot signal, and the smart reflector multiplies the entire codebook by -1 at the starting position of received symbol 3.

[0105] Step S804: After receiving the pilot signal, the base station performs channel separation.

[0106] Specifically, assume that the pilot signals obtained by dividing the pilot signals of symbol 2 and symbol 3 by their respective mother codes are H and H respectively. ls2 H ls3 Then the direct channel between the base station and the terminal can be represented as (H ls2 +H ls3 The channel between the base station and the terminal, reflected by the intelligent reflector, can be represented as (H) / 2. ls2 -H ls3 ) / 2. The obtained direct and reflected channels can be used for subsequent channel estimation, positioning, and other operations.

[0107] In this embodiment, the base station notifies the terminal of the configuration parameters of the uplink pilot signal. The pilots need to appear in groups of two OFDM symbols, preferably consecutive symbols. One or more groups can be configured. Considering the handover limitations of RIS, if handover on consecutive symbols cannot be achieved, then the two pilot symbols should be separated by at most one symbol. The pilots of the two symbols should occupy the same RE and RB. The pilots here can be DMRS, SRS, etc., and they all need to appear on two symbols at the same time.

[0108] In this embodiment, the base station configures a set of parameters for the RIS, and these configuration parameters need to include:

[0109] A parameter related to the codebook reflection coefficient, which indicates that the entire RIS codebook is multiplied by a scalar. The default value is -1, and this configuration parameter can be omitted. When the base station reflects the uplink pilot signal, the intelligent reflector needs to switch to a new codebook at the specified symbol position. The new codebook = configured reflection coefficient * old codebook.

[0110] One parameter needs to indicate in which OFDM symbols the RIS switches the codebook, and the symbol positions for switching the codebook can also be agreed upon in advance. Since there are many types of pilots, the agreed-upon default values ​​should only apply to commonly used pilot signals. Due to the diversity of pilot types and configurations, this parameter cannot be omitted in most cases.

[0111] One parameter requires the base station to indicate to the smart reflector the time when the handover is needed. This time can be a specific time slot, a specific label of the time slot and OFDM symbol, or a specific time. There are no specific limitations here.

[0112] It should be noted that the RIS in all the above embodiments of the present invention can be replaced with a repeater. For specific examples, please refer to the examples described in the above embodiments and exemplary implementations. This embodiment will not be repeated here.

[0113] Through the above embodiments of the present invention, by the signaling interaction between the base station, the intelligent reflector and the terminal, and the codebook change of the intelligent reflector, code division in the time domain is generated at the receiving end between the direct channel and the reflected channel, thereby simply and effectively separating the direct channel and the reflected channel passing through the intelligent reflector, achieving the purpose of improving throughput and positioning accuracy.

[0114] Embodiments of the present invention also provide a computer-readable storage medium storing a computer program, wherein the computer program is configured to perform the steps in any of the above method embodiments when executed.

[0115] In one exemplary embodiment, the aforementioned computer-readable storage medium may include, but is not limited to, various media capable of storing computer programs, such as a USB flash drive, read-only memory (ROM), random access memory (RAM), portable hard disk, magnetic disk, or optical disk.

[0116] Embodiments of the present invention also provide an electronic device including a memory and a processor, the memory storing a computer program and the processor being configured to run the computer program to perform the steps in any of the above method embodiments.

[0117] In one exemplary embodiment, the electronic device may further include a transmission device and an input / output device, wherein the transmission device is connected to the processor and the input / output device is connected to the processor.

[0118] Specific examples in this embodiment can be found in the examples described in the above embodiments and exemplary implementations, and will not be repeated here.

[0119] It is obvious to those skilled in the art that the modules or steps of the present invention described above can be implemented using general-purpose computing devices. They can be centralized on a single computing device or distributed across a network of multiple computing devices. They can be implemented using computer-executable program code, and thus can be stored in a storage device for execution by a computing device. In some cases, the steps shown or described can be performed in a different order than those described herein, or they can be fabricated as separate integrated circuit modules, or multiple modules or steps can be fabricated as a single integrated circuit module. Thus, the present invention is not limited to any particular combination of hardware and software.

[0120] The above description is merely a preferred embodiment of the present invention and is not intended to limit the invention. Various modifications and variations can be made to the present invention by those skilled in the art. Any modifications, equivalent substitutions, or improvements made within the principles of the present invention should be included within the scope of protection of the present invention.

Claims

1. A channel separation method, characterized in that, include: The intelligent reflector or repeater located between the base station and the terminal switches the reflected pilot signal to a new codebook at a specified symbol position based on the pre-configured codebook reflection coefficient. Before the intelligent reflector or repeater switches the reflected pilot signal to a new codebook at a specified symbol position, it further includes: The base station is configured with or has agreed upon a set of parameters for the smart reflector or repeater, wherein the parameter set includes: a first parameter, a second parameter, and a third parameter; wherein, The first parameter is used to indicate the codebook reflection coefficient; The second parameter is used to indicate at which pilot symbol positions the smart reflector or repeater performs codebook switching; The third parameter is used to indicate the time for the smart reflector or repeater to switch codebooks, wherein the time includes at least one of the following: time slot, pilot symbol.

2. The method according to claim 1, characterized in that, Before the intelligent reflector or repeater switches the reflected pilot signal to a new codebook at the specified symbol position, it also includes: The base station notifies the terminal about the configuration of the pilot signal, wherein the pilot signal appears in groups of two pilot symbols, and one or more groups of pilot symbols are configured.

3. The method according to claim 2, characterized in that, 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 on each RB is the same.

4. The method according to claim 1, characterized in that, The pilot signal is one of the following: DMRS, SSB, PRS, CSI-RS.

5. The method according to claim 1, characterized in that, The intelligent reflector or repeater switches the reflected pilot signal to a new codebook, including: The intelligent reflector or repeater switches the pilot signal from an old codebook to a new codebook on one of the two configured pilot symbols, wherein the new codebook is the old codebook multiplied by the codebook reflection coefficient.

6. The method according to claim 1, characterized in that, After switching the reflected pilot signal to the new codebook at the specified symbol position, the process also includes: After receiving the pilot signal, the terminal or base station separates the direct channel between the base station and the terminal and the reflected channel reflected by the intelligent reflector or repeater according to the codebook on the different pilot symbols of the pilot signal.

7. The method according to claim 6, characterized in that, After separating the direct channel between the base station and the terminal and the reflected channel reflected by the smart reflector or repeater, it also includes: The terminal feeds back the measurement results of the direct channel and the reflection channel separately or jointly based on the measurement feedback signaling.

8. A channel separation system, characterized in that, include, A smart reflector or repeater, located between a base station and a terminal, is used to switch the reflected pilot signal to a new codebook at a specified symbol position according to a pre-configured codebook reflection coefficient. The base station is further configured to configure a parameter set for the smart reflector or repeater, or to agree on the parameter set with the smart reflector or repeater, wherein the parameter set includes: a first parameter, a second parameter, and a third parameter; wherein the first parameter is used to indicate the codebook reflection coefficient; the second parameter is used to indicate at which pilot symbol positions the smart reflector or repeater performs codebook switching; the third parameter is used to indicate the time when the smart reflector or repeater performs codebook switching, wherein the time includes at least one of the following: time slot, pilot symbol.

9. The system according to claim 8, characterized in that, Also includes: A base station is used to notify the terminal about the configuration of the pilot signal, wherein the pilot signal appears in groups of two pilot symbols, and one or more groups of pilot symbols are configured.

10. The system according to claim 8, characterized in that, The base station or the terminal is further configured to, upon receiving the pilot signal, separate the direct channel between the base station and the terminal and the reflected channel reflected by the intelligent reflector or repeater according to the codebook on the different pilot symbols of the pilot signal.

11. The system according to claim 10, characterized in that, The terminal is also used to feed back the measurement results of the direct channel and the reflection channel separately or jointly based on measurement feedback signaling.

12. A computer-readable storage medium, characterized in that, The computer-readable storage medium stores a computer program, wherein the computer program, when executed by a processor, implements the steps of the method described in any one of claims 1 to 7.

13. An electronic device comprising a memory, a processor, and a computer program stored in the memory and executable on the processor, characterized in that, When the processor executes the computer program, it implements the steps of the method described in any one of claims 1 to 7.

Images