WO2026016507A1 - Reference signal measurement method and transmission/reception point (trp) selection method - Google Patents

Abstract

Provided in the embodiments of the present disclosure are a reference signal measurement method and a transmission/reception point (TRP) selection method. The reference signal measurement method comprises: by means of multiple instances of time-domain sampling, measuring multiple reference signals of multiple candidate TRPs to obtain measurement results for the multiple reference signals, wherein the measurement results are used for determining, from among the multiple candidate TRPs, a target TRP combination that provides services for a user equipment.

Description

Methods for measuring reference signals and methods for selecting Transmitter-Receiver Nodes (TRPs).

Cross-reference to related applications

This disclosure is based on and claims priority to Chinese patent application CN202410968403.9, filed on July 18, 2024, entitled “Method for measuring reference signal and method for selecting transmission and reception node TRP”, the entire contents of which are incorporated herein by reference.

Technical Field

This disclosure relates to the field of communications, and more specifically, to a method for measuring a reference signal and a method for selecting a Transmitter Receiver (TRP).

Background Technology

In cell-free networks, multiple Transmission/Reception Points (TRPs) can simultaneously serve a user. For coherent joint transmission, multiple base stations send the same data signal to the user, and these signals are coherently superimposed upon arrival at the user's end, significantly improving coverage and throughput for edge users. However, when multiple TRPs serve a single user, factors such as user movement, synchronization errors, or channel variations may prevent the signals from coherently superimposing. This can lead to deep fading in the user's received signal, characterized by drastic fluctuations in signal strength due to the superposition of multiple signals, resulting in a significant decrease in the amplitude of the received signal.

In fifth-generation mobile communication technology, to improve the service quality for users at the network coverage edge, multiple transmission nodes can simultaneously serve a single user, a technique known as multi-transmitter-receiver node (mTRP). mTRP requires selecting multiple Transmission Nodes (TRPs) to serve the user, and the current approach selects these nodes based on signal strength. However, during coherent transmission, even with slow user movement, the received signal strength can change rapidly. Therefore, the current TRP selection scheme cannot address the problem of deep fading in the user's received signal.

There is no good solution to the above problems in the relevant technologies.

Summary of the Invention

This disclosure provides a method for measuring a reference signal and a method for selecting a Transmitter Receiver (TRP), in order to at least solve the technical problem that TRP selection schemes in related technologies cannot improve deep fading of user received signals.

According to one embodiment of this disclosure, a method for measuring reference signals is provided. The method includes: measuring multiple reference signals of multiple candidate transmit-receive nodes (TRPs) through multiple time-domain sampling to obtain measurement results of multiple reference signals, wherein the measurement results are used to determine a target TRP combination that provides services to a user equipment from the multiple candidate TRPs.

According to another embodiment of this disclosure, a method for selecting a Transmission Receiver Node (TRP) is provided. The method includes: acquiring measurement results of multiple reference signals transmitted by a User Equipment (UE), wherein the measurement results are obtained by the UE through multiple time-domain sampling of multiple reference signals of multiple candidate TRPs; and determining a target TRP combination for providing services to the UE from the multiple candidate TRPs based on the measurement results.

According to yet another embodiment of this disclosure, a computer-readable storage medium is also provided, which stores a computer program, wherein the computer program is executed by a processor to perform the steps in any of the above method embodiments.

According to yet another embodiment of this disclosure, an electronic device is also provided, including a memory and a processor, the memory storing a computer program, the processor being configured to run the computer program to perform the steps in any of the above method embodiments.

According to yet another embodiment of this disclosure, a computer program product is also provided, including a computer program that, when executed by a processor, implements the steps in any of the above method embodiments.

Through the embodiments of this application, the reference signals of multiple nodes are combined and sampled multiple times. The optimal node combination is selected by combining the sampling results of multiple time domains, thereby improving the overall signal quality and solving the technical problem that the TRP selection scheme in related technologies cannot improve the deep fading of the user's received signal.

Attached Figure Description

Figure 1 is a hardware structure block diagram of a mobile terminal for a reference signal measurement method according to an embodiment of the present disclosure;

Figure 2 is a flowchart of a method for measuring a reference signal according to an embodiment of the present disclosure;

Figure 3 is a flowchart of a method for selecting a Transmission Receiver Node (TRP) according to an embodiment of the present disclosure;

Figure 4 is an overall flowchart of the TRP selection method according to an embodiment of the present disclosure;

Figure 5 is a schematic diagram (a) of the time-frequency resources occupied by the reference signals of multiple TRPs in one embodiment of this disclosure;

Figure 6 is a schematic diagram (II) of the time-frequency resources occupied by the reference signals of multiple TRPs in one embodiment of this disclosure;

Figure 7 is a schematic diagram of a reference signal being transmitted according to a preset period in one embodiment of the present disclosure;

Figure 8 is a schematic diagram of continuous transmission of a reference signal in one embodiment of the present disclosure.

Detailed Implementation

The embodiments of this disclosure will be described in detail below with reference to the accompanying drawings and examples.

It should be noted that the terms "first," "second," etc., in the specification, claims, and drawings of this disclosure are used to distinguish similar objects and are not necessarily used to describe a specific order or sequence.

The method embodiments provided in this disclosure can be executed in a mobile terminal, computer terminal, or similar computing device. Taking a computer terminal as an example, FIG1 is a hardware structure block diagram of a mobile terminal for measuring a reference signal according to an embodiment of this disclosure. As shown in FIG1, the hardware board may include one or more (only one is shown in FIG1) processors 12 (processors 12 may include, but are not limited to, processing devices such as microprocessors MCUs or programmable logic devices FPGAs) and a memory 14 for storing data. The computer terminal may also include a transmission device 16 for communication functions and an input/output device 18. It will be understood by those skilled in the art that the structure shown in FIG1 is only illustrative and does not limit the structure of the computer terminal. For example, the computer terminal may also include more or fewer components than shown in FIG1, or have a different configuration than shown in FIG1.

The memory 14 can be used to store computer programs, such as application software programs and modules, like the computer program corresponding to the reference signal measurement method in this embodiment. The processor 12 executes various functional applications and the reference signal measurement method by running the computer program stored in the memory 14, i.e., implementing the method described above. The memory 14 may include high-speed random access memory, and may also include non-volatile memory, such as one or more magnetic storage devices, flash memory, or other non-volatile solid-state memory. In some instances, the memory 14 may further include memory remotely located relative to the processor 12, and these remote memories can be connected to a computer terminal via a network. Examples of such networks include, but are not limited to, the Internet, corporate intranets, local area networks, mobile communication networks, and combinations thereof.

The transmission device 16 is used to receive or send data via a network. Specific examples of the network described above may include a wireless network provided by a telecommunications provider. In one example, the transmission device 16 includes a Network Interface Controller (NIC), which can connect to other network devices via a base station to communicate with the Internet. In another example, the transmission device 16 may be a Radio Frequency (RF) module, used for wireless communication with the Internet.

This disclosure embodiment can operate in a cell-free network, whose network architecture includes: a base station, a transmission/reception point (TRP), and user equipment. The base station can coordinate communication between multiple TRPs, and the TRPs provide services to the user equipment. Alternatively, the base station can be replaced by a primary TRP among the multiple TRPs.

This embodiment provides a method for measuring a reference signal, which can be run on the aforementioned mobile terminal or other user equipment. Figure 2 is a flowchart of the method for measuring a reference signal according to an embodiment of this disclosure. As shown in Figure 2, the process includes the following steps:

Step S202: By performing multiple time-domain sampling, multiple reference signals of multiple candidate transmit-receive nodes (TRPs) are measured to obtain the measurement results of the multiple reference signals. The measurement results are used to determine the target TRP combination that provides services to the user equipment from the multiple candidate TRPs.

In this embodiment of the disclosure, the above steps can be used to combine and sample the reference signals of multiple nodes, and the optimal node combination can be selected by combining the sampling results of multiple time domains. This can improve the overall signal quality and solve the technical problem that the TRP selection scheme in related technologies cannot improve the deep fading of the user's received signal.

The entity performing the above steps can be a user device in a non-cellular network, such as a mobile terminal or a computer terminal, but this disclosure is not limited to this.

In one exemplary embodiment, the reference signal may be a Channel State Information-Reference Signal (CSI-RS), a Demodulation Reference Signal, or other forms of reference signal, and this disclosure does not limit this.

In some embodiments, the measurement results include at least one of the following: Reference Signal Received Power (RSRP); Received Signal Strength Indicator (RSSI); Received Signal Amplitude; Received Signal Phase; Symbol Information of the Received Signal.

In an exemplary embodiment, the symbol information of the received signal can be represented as:
x _i,m = h _i,m s _i,m = αe ^jθ ;

Where x i,m  represents the symbol information (detection result) of the received signal of the m-th TRP in the i-th time domain sampling period, s i,m  represents the reference signal transmitted by the m-th TRP in the i-th reference signal transmission period, h i,m represents the channel between the user equipment and the m-th TRP in the i-th reference signal transmission period, α represents the received signal amplitude, and ejθ represents the received signal phase.

In some embodiments, before step S202, the method further includes: step S200, receiving downlink signaling sent by a base station, wherein the downlink signaling carries resource configuration information of the plurality of reference signals, and the resource configuration information is used to instruct the user equipment to receive the plurality of reference signals.

In one exemplary embodiment, the downlink signaling includes broadcast messages such as a Synchronization signal/Physical Broadcast Channel Block (SS/PBCH Block), Downlink Control Information (DCI), Radio Resource Control (RRC) signaling, and Medium Access Control (MAC CE).

In some embodiments, the resource configuration information includes at least one of the following: time domain information, frequency domain information, and code domain information.

In some embodiments, the time-domain resources and/or frequency-domain resources of the plurality of reference signals are the same.

In one exemplary embodiment, the plurality of reference signals may occupy the same time-frequency resources, or the plurality of reference signals may be divided into multiple groups, with each group of reference signals occupying the same time-frequency resources. The plurality of reference signals corresponding to the same time-frequency resources may be transmitted in a code division multiple access (CDMA) manner, that is, the plurality of reference signal sequences are mutually orthogonal.

In an exemplary embodiment, different reference signals or different groups of reference signals can be distinguished by time-domain resources and frequency-domain resources, thereby ensuring that the user equipment can detect and distinguish multiple reference signals.

In some embodiments, the plurality of reference signals in step S202 are transmitted by the plurality of candidate TRPs according to a preset period; or, the plurality of reference signals are transmitted continuously in the time domain by the plurality of candidate TRPs. Continuous or multiple transmissions of the reference signals enable the user equipment to perform multiple time-domain samplings on each reference signal, avoiding large fluctuations in the detection results within a short period and improving the accuracy of the detection results.

In some embodiments, step S202 may include: performing multiple time-domain samplings on each of the plurality of reference signals according to a preset period and a preset resource configuration to obtain multiple measurement results for each reference signal within multiple time-domain sampling periods, wherein each measurement result corresponds to one time-domain sampling period and one reference signal.

In an exemplary embodiment, assuming there are M candidate TRPs, after receiving reference signals transmitted by the M candidate TRPs, the user equipment can obtain the measurement results of the M reference signals. Let _xi,j be the measurement result of the j-th reference signal in the i-th time-domain sampling period, where 1≤i≤T, 1≤j≤M, T is the number of times the reference signal is transmitted (i.e., the total number of periods), and M is the number of reference signals from different TRPs that can be received within one period. Then, for the i-th reference signal transmission period, the user can obtain a total of M measurement results: xi _,1 , xi _,2 , ..., xi _,M .

In some embodiments, the method may further include the following steps:

Step S204: Combine the multiple candidate TRPs to obtain multiple candidate TRP combinations, wherein each candidate TRP combination contains a preset number of candidate TRPs;

Step S206: The measurement results of the reference signals corresponding to all candidate TRPs in each candidate TRP combination are calculated according to a preset calculation method to obtain the calculation result of each candidate TRP combination. The calculation result of the candidate TRP combination is used to determine the target TRP combination from the multiple candidate TRP combinations.

In this embodiment, multiple candidate TRP combinations are determined by permutation and combination of all possible TRP combinations. For example, if the total number of candidate TRPs is M, and the preset number (i.e., the number of target TRPs) is K, then K target TRPs need to be selected from the M candidate TRPs. In this case, there are a total of [number missing] candidate TRP combinations. A combination, in which, This represents the number of combinations of choosing K elements from M elements, where K is less than or equal to M.

In some embodiments, the preset quantity may include multiple values, or the preset quantity may be set to empty, in which case all possible candidate TRP combinations can be traversed. The number of candidate TRPs included in a single candidate TRP combination can be set to a traversal from 1 to M. For example, assuming there are a total of M candidate TRPs, and at least one target TRP is selected to serve the user, then there are a total of There are several candidate TRP combinations, and a calculation result can be obtained for each candidate TRP combination.

In this embodiment, step S206 is used to select an optimal result from all candidate TRP combinations. The calculation method will also be different based on the difference in the way the optimal result is measured.

In some embodiments, the preset calculation method and the preset quantity are notified to the user equipment by the base station via downlink signaling.

In some embodiments, step S206 may include the following steps:

Step S2062: According to the preset first calculation method, the measurement results of the reference signals corresponding to all candidate TRPs in each candidate TRP combination in each time domain sampling period are calculated to obtain multiple first calculation results, wherein each first calculation result corresponds to a candidate TRP combination and a time domain sampling period.

Step S2064: According to the preset second calculation method, the first calculation result of each candidate TRP combination in all time domain sampling periods is calculated to obtain the calculation result of each candidate TRP combination.

In some embodiments, step S2062 includes at least one of the following:

For each time-domain sampling period, determine the superposition result of the measurement results of all reference signals corresponding to each candidate TRP combination;

For each time-domain sampling period, determine the average value of the measurement results of all reference signals corresponding to each candidate TRP combination;

For each time-domain sampling period, determine the magnitude of the superposition result of the measurement results of all reference signals corresponding to each candidate TRP combination;

For each time-domain sampling period, determine the average value of the magnitude of the superposition of the measurement results of all reference signals corresponding to each candidate TRP combination;

For each time-domain sampling period, determine the superposition result of the magnitudes of the measurement results of all reference signals corresponding to each candidate TRP combination;

For each time-domain sampling period, the average value of the magnitude of the measurement results of all reference signals corresponding to each candidate TRP combination is determined.

In an exemplary embodiment, the first calculation result is the superposition result of multiple measurement results. Assuming that the TRP indices included in the j-th candidate TRP combination are represented by the set A _{_j}, the first calculation result y_{_i,j} of the j-th candidate TRP combination in the i-th time domain sampling period can be expressed as:

In some embodiments, step S2064 includes at least one of the following:

Determine the superposition result of the modulus values of the first operation results of each candidate TRP combination across all time domain sampling periods;

Determine the average value of the modulus of the first computation result for each candidate TRP combination across all time-domain sampling periods;

Determine the superposition result of the first operation results of each candidate TRP combination across all time domain sampling periods;

Determine the average value of the first computation result for each candidate TRP combination across all time-domain sampling periods;

Determine the variance of the first computation result/magnitude of the first computation result for each candidate TRP combination across all time-domain sampling periods;

Determine the standard deviation of the first computation result/the modulus of the first computation result for each candidate TRP combination across all time-domain sampling periods;

Determine the range of the first operation result/first operation result modulus for each candidate TRP combination across all time domain sampling periods.

In an exemplary embodiment, assuming the user equipment measures T time-domain sampling periods, the second computation result _yj corresponding to the j-th candidate TRP combination can be expressed as at least one of the following:

The result of superimposing the moduli of multiple first operation results:

The average of the moduli of multiple first operation results:

The result of superimposing multiple first operation results:

The average of multiple first operation results:

Where y _{_i,j} is the first computation result of the j-th candidate TRP combination in the i-th time domain sampling period.

In one exemplary embodiment, to ensure the robustness of data transmission for the selected TRP combination, the computation result can also be a measure of the stability of multiple cycle measurement results.

In an exemplary embodiment, assuming the user equipment measures T time-domain sampling periods, the second operation result _yj corresponding to the j-th candidate TRP combination can also be expressed as at least one of the following:

Variance of multiple first operation results:

The range of multiple first operation results: y _{_j} = y _{_max,j} - y _{_min,j};

Standard deviations of multiple first operation results:

in, Let y_max _,j = max_i |y_i _,j | represent the average value of the first operation result of the j-th candidate TRP group in multiple time-domain sampling periods, _and let _{y_min,j} = _{min_i} | _{y_i,j} | represent the maximum value of the first operation result of the j-th candidate TRP group in multiple time-domain sampling periods.

In this embodiment, the correspondence between the reference signal and the candidate TRP can be transparent or opaque to the user equipment side. If the user equipment is not aware of the correspondence between the two, the user equipment can report the measurement results, calculation results or the selected combination of reference signals to the base station. If the user can be aware of the correspondence between the two, the user equipment can directly select the target TRP combination and report it to the base station.

In some embodiments, the method further includes: step S208A, determining the target TRP combination based on the calculation results of the plurality of candidate TRP combinations, and reporting the target TRP combination to the base station.

In this embodiment, the user equipment can select a target TRP combination for reporting based on the calculation result. For example, when the calculation result is the mean, the user can select the candidate TRP combination with the largest mean as the target TRP combination and report it; when the calculation result is the variance, the user can select the candidate TRP combination with the smallest variance as the target TRP combination and report it.

In some embodiments, the user can also select the optimal TRP combination based on multiple calculation results. For example, the selection can be based on both the mean and variance simultaneously. The specific selection method and selection conditions can be set according to user needs and are not limited here.

In some embodiments, the method further includes: step S208B, reporting the calculation results of the plurality of candidate TRP combinations to the base station, so that the base station determines the target TRP combination from the plurality of candidate TRPs based on the calculation results of the plurality of candidate TRP combinations.

In this embodiment, the user side may only report the calculation results. For example, the base station instructs the user side to report the optimal L calculation results via signaling. The calculation results can be any one of the results described in the above embodiments, or any combination of several results. For example, the user side may report the mean and variance of the top L candidate TRP combinations with the largest mean, according to the base station's instruction. However, this disclosure is not limited to this, and the reporting method and content adopted by the user equipment can be flexibly configured by the base station via signaling.

In some embodiments, the method further includes: step S208C, directly reporting the measurement results to the base station, and then the base station determining the target TRP combination based on the measurement results.

In some embodiments, the candidate TRP combinations can be identified by the reference signal indices. That is, the user side does not need to concern itself with the correspondence between TRPs and reference signals; it only needs to determine the detection results of each reference signal, the calculation results of each reference signal combination, or the optimal reference signal combination. The base station then determines the optimal TRP combination based on the correspondence between the reference signals and TRPs.

In this embodiment of the disclosure, reference signals from multiple nodes can be combined and sampled multiple times. By integrating the sampling results from multiple time domains, the optimal node combination can be selected, thereby improving the overall signal quality and solving the technical problem that the TRP selection scheme in related technologies cannot improve the deep fading of user received signals.

In one exemplary embodiment, the user only reports the calculation results. For example, the base station instructs the user to report the optimal L calculation results via signaling. The calculation results can be any one of the above-mentioned items, or any combination of several items. For example, the user can report the mean and variance of the top L TRP combinations with the largest mean, as instructed by the base station.

This embodiment provides a method for selecting a Transmission Receiver Node (TRP), which can operate in a 6G architecture (such as a non-cellular network) and is used to manage and control a base station or master TRP with multiple TRPs. Figure 3 is a flowchart of the method for selecting a Transmission Receiver Node (TRP) according to an embodiment of this disclosure. As shown in Figure 3, the process includes the following steps:

Step S302: Obtain the measurement results of multiple reference signals sent by the user equipment, wherein the measurement results are obtained by the user equipment through multiple time-domain sampling of multiple reference signals of multiple candidate transmit-receive nodes (TRPs).

Step S304: Determine the target TRP combination for providing services to the user equipment from multiple candidate TRPs based on the measurement results.

In this embodiment of the disclosure, through the above steps S302 to S304, the reference signals of multiple nodes can be combined and sampled multiple times on the user side. On the base station side, the optimal node combination is selected by integrating the sampling results of multiple time domains, thereby improving the overall signal quality and solving the technical problem that the TRP selection scheme in related technologies cannot improve the deep fading of the user's received signal.

In some embodiments, the measurement results include at least one of the following: Reference Signal Received Power (RSRP); Received Signal Strength Indicator (RSSI); Received Signal Amplitude; Received Signal Phase; and Symbol Information of the Received Signal.

In an exemplary embodiment, the symbol information of the received signal can be represented as:
x _i,m = h _i,m s _i,m = αe ^jθ ;

Where x _{_i,m} represents the symbol information (detection result) of the received signal of the m-th TRP in the i-th time-domain sampling period, s _{_i,m} represents the reference signal transmitted by the m-th TRP in the i-th reference signal transmission period, h _{_i,m} represents the channel between the user equipment and the m-th TRP in the i-th reference signal transmission period, α is the received signal amplitude, and e^{^jθ} is the received signal phase. The symbol information can also be written in sequence form to represent the symbol information of the reference signal over a period of time.

In some embodiments, the method further includes: step S300, sending downlink signaling to the user equipment and the plurality of candidate TRPs, wherein the downlink signaling carries resource configuration information of the plurality of reference signals.

In this embodiment, the base station can control the communication resources for transmitting reference signals for each candidate TRP through downlink signaling, thereby ensuring that the user equipment can detect the reference signals of multiple TRPs and enable the user equipment to perform combined measurement of the reference signals of multiple TRPs.

In one exemplary embodiment, downlink signaling includes broadcast messages such as SS/PBCH, DCI, RRC signaling, and MAC CE.

In some embodiments, the resource configuration information includes at least one of the following: time domain information, frequency domain information, and code domain information.

In some embodiments, the time-domain resources and/or frequency-domain resources of the plurality of reference signals are the same.

In one exemplary embodiment, the plurality of reference signals may occupy the same time-frequency resources, or the plurality of reference signals may be divided into multiple groups, with each group of reference signals occupying the same time-frequency resources. The plurality of reference signals corresponding to the same time-frequency resources may be transmitted using Code Division Multiple Access (CDMA), meaning the plurality of reference signal sequences are mutually orthogonal.

In an exemplary embodiment, different reference signals or different groups of reference signals can be distinguished by time-domain resources and frequency-domain resources, thereby ensuring that the user equipment can detect and distinguish multiple reference signals.

In some embodiments, step S304 may include the following steps:

Step S3042: Combine the multiple candidate TRPs to obtain multiple candidate TRP combinations, wherein each candidate TRP combination contains a preset number of candidate TRPs;

Step S3044: Calculate the measurement results of the reference signals corresponding to all candidate TRPs in each candidate TRP combination according to the preset calculation method to obtain the calculation result of each candidate TRP combination;

Step S3046: Determine the target TRP combination from the plurality of candidate TRP combinations based on the calculation results of the candidate TRP combinations.

In some embodiments, steps S3042 and S3044 can also be implemented on the user-side equipment, whereby the base station directly obtains the calculation results of each subsequent TRP combination reported by the user equipment and executes step S3046.

In some embodiments, steps S3042 to S3046 can also be implemented in the user equipment, and the base station can directly obtain the target TRP combination processed according to the above steps from the user equipment.

In some embodiments, step S3044 above may include the following steps:

Step S3044-2: According to the preset first calculation method, the measurement results of the reference signals corresponding to all candidate TRPs in each candidate TRP combination in each time domain sampling period are calculated to obtain multiple first calculation results, wherein each first calculation result corresponds to one candidate TRP combination and one time domain sampling period;

Step S3044-4: According to the preset second calculation method, the first calculation result of each candidate TRP combination in all time domain sampling periods is calculated to obtain the calculation result of each candidate TRP combination.

In some embodiments, step S3044-2 may include at least one of the following:

For each time-domain sampling period, determine the superposition result of the measurement results of all reference signals corresponding to each candidate TRP combination;

For each time-domain sampling period, determine the average value of the measurement results of all reference signals corresponding to each candidate TRP combination;

For each time-domain sampling period, determine the magnitude of the superposition result of the measurement results of all reference signals corresponding to each candidate TRP combination;

For each time-domain sampling period, determine the average value of the magnitude of the superposition of the measurement results of all reference signals corresponding to each candidate TRP combination;

For each time-domain sampling period, determine the superposition result of the magnitudes of the measurement results of all reference signals corresponding to each candidate TRP combination;

For each time-domain sampling period, the average value of the magnitude of the measurement results of all reference signals corresponding to each candidate TRP combination is determined.

In some embodiments, step S3044-4 may include at least one of the following:

Determine the superposition result of the modulus values of the first operation results of each candidate TRP combination across all time domain sampling periods;

Determine the average value of the modulus of the first computation result for each candidate TRP combination across all time-domain sampling periods;

Determine the superposition result of the first operation results of each candidate TRP combination across all time domain sampling periods;

Determine the average value of the first computation result for each candidate TRP combination across all time-domain sampling periods;

Determine the variance of the first computation result/magnitude of the first computation result for each candidate TRP combination across all time-domain sampling periods;

Determine the standard deviation of the first computation result/the modulus of the first computation result for each candidate TRP combination across all time-domain sampling periods;

Determine the range of the first operation result/first operation result modulus for each candidate TRP combination across all time domain sampling periods.

In this embodiment of the disclosure, multiple TRP reference signals can be combined and sampled multiple times. The optimal TRP combination can be selected by combining the sampling results of multiple time domains, thereby improving the overall signal quality and solving the technical problem that the TRP selection scheme in related technologies cannot improve the deep fading of the user's received signal.

The various embodiments in this disclosure can be applied to a 6G network architecture, which includes a base station, a TRP, and user equipment, wherein the base station can dynamically select one or more TRPs to provide services to each user equipment.

Figure 4 is an overall flowchart of the TRP selection method according to an embodiment of the present disclosure. As shown in Figure 4, the process includes the following steps:

In step S402, multiple candidate TRPs send downlink reference signals to the user equipment;

Step S404: The user equipment measures each reference signal;

Step S406: The user equipment reports the result to the base station.

In this embodiment, the reported result in step S406 may include at least one of the following: measurement result, calculation result of combining measurement results, reference signal combination selected according to the calculation result, and TRP combination.

In some embodiments, assuming there are M candidate TRPs, the M candidate TRPs will simultaneously (or within the same time domain sampling period) send downlink reference signals to the user equipment, and the user equipment will detect a total of M downlink reference signals.

In some embodiments, each TRP transmits downlink reference signals carrying different sequence information, such as its own identification identifier and different orthogonal codes. Even if M reference signals are received by the user simultaneously, the user can detect the measurement results of each of the M reference signals and correlate the measurement results with the reference signals. Therefore, the user equipment can clearly know the correspondence between each reference signal and each measurement result.

In some embodiments, the correspondence between the M reference signals and the M TRPs is transparent to the user. The user equipment only needs to obtain the measurement results corresponding to these M reference signals, without needing to obtain the correspondence between the reference signals and the TRPs.

Figure 5 is a schematic diagram (I) of the time-frequency resources occupied by the reference signals of multiple TRPs in one embodiment of the present disclosure. As shown in Figure 5, multiple reference signals may occupy the same or different time-frequency resources.

In this embodiment, the M reference signals transmitted by the M TRPs can occupy the same time-frequency resources. Since the reference signals transmitted by each TRP occupy the same time-frequency resources, in order to ensure that the user equipment can detect all the reference signals, the M reference signals are transmitted in a code division multiple access (CDMA) manner, that is, the reference signal sequences transmitted by different TRPs are orthogonal to each other, and the orthogonal sequences are used to help the user equipment perform reception and detection.

In an exemplary embodiment, as shown in FIG5a, assuming M=8, the 8 reference signals occupy the same time-frequency resources, then 8 orthogonal sequences are required, namely CDM8. Each sequence requires 8 resource elements (REs) to carry it, and each RE carries one element of the orthogonal sequence.

In one exemplary embodiment, the orthogonal sequence carried over these 8 resource units is shown in Table 1 below.

Table 1:

In another exemplary embodiment, the orthogonal sequence carried in these 8 resource units can also be the result of multiplying two orthogonal sequences, as shown in Table 2.

Table 2:

This disclosure provides only two implementation methods for orthogonal sequences, but it does not restrict the sequences used for each reference signal, as long as the user can simultaneously detect reference signals sent by different TRPs.

In some embodiments, among the reference signals transmitted by the M TRPs, only a portion of the reference signals occupy the same time-frequency resources.

In one exemplary embodiment, as shown in Figures 5b and 5c, assuming there are 8 TRPs and 8 reference signals to be transmitted, Figure 5b divides the reference signals into 2 groups, with each group of 4 reference signals occupying the same time-frequency resources. The reference signals occupying the same time-frequency resources are distinguished using code division multiple access (CDMA). Each group of reference signals uses 4 orthogonal codes, referred to as CDM4. Figure 5c divides the reference signals into 4 groups, with each group of reference signals using 2 orthogonal codes, referred to as CDM2.

In an exemplary embodiment, the time-frequency resources occupied by all reference signals transmitted by the M TRPs can be different, as shown in FIG5d. The user can distinguish the reference signals transmitted by different TRPs based on the time-frequency resources.

Figure 6 is a schematic diagram (II) of the time-frequency resources occupied by the reference signals of multiple TRPs in one embodiment of this disclosure. As shown in Figure 6, the multiple reference signals occupy different time-domain resources but the same frequency-domain resources.

In this embodiment, the transmission of the M TRP reference signals can be performed using time-domain code division. Multiple reference signals occupy only one subcarrier in the frequency domain, utilizing the time-domain bandwidth for code division multiple access.

In this embodiment of the disclosure, in order to enhance the robustness of TRP selection, the reference signal can be continuously transmitted or periodically transmitted over multiple time domain periods.

Figure 7 is a schematic diagram of the transmission of reference signals according to a preset period in one embodiment of the present disclosure. As shown in Figure 7, the reference signals of multiple TRPs can be transmitted multiple times according to a preset time domain period. In each period, multiple TRPs can transmit reference signals according to the time and frequency resources in the above embodiment.

In this embodiment, the transmission period of the reference signal on the TRP side can be N symbols, time slots, subframes, frames, etc., and this disclosure does not impose any limitations on this. The time domain sampling period on the user equipment side is the same as the transmission period, and can also be N symbols, time slots, subframes, frames, etc.

Figure 8 is a schematic diagram of continuous transmission of reference signals in one embodiment of the present disclosure. As shown in Figure 8, reference signals of multiple TRPs can be continuously transmitted in the time domain.

In this embodiment, multiple TRPs can continuously transmit downlink reference signals within a preset time period, allowing the user to perform multiple time-domain samplings and obtain multiple measurement results.

In the embodiments of this disclosure, the time-frequency resources, orthogonal sequence, and transmission/sampling period occupied by the reference signal are configured by the base station through uplink signaling. For example, downlink signaling may include broadcast messages, such as Physical Broadcast Channel/Synchronization Block, Downlink Control Information (DCI), Radio Resource Control (RRC) signaling, Media Access Control Unit (MAC) CE, etc. This disclosure does not limit the form of the reference signal; for example, the reference signal may include: Channel State Information Reference Signal (CSI-RS), demodulation reference signal, or other forms of reference signal.

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 this disclosure, in essence, 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 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 this disclosure.

Embodiments of this disclosure also provide a computer-readable storage medium storing a computer program, wherein the computer program is executed by a processor to perform the steps in any of the above method embodiments.

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 drive, magnetic disk, or optical disk.

Embodiments of this disclosure 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.

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.

Embodiments of this disclosure also provide a computer program product, including a computer program that, when executed by a processor, implements the steps of the methods described in various embodiments of this disclosure.

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.

It is obvious to those skilled in the art that the modules or steps of this disclosure 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 presented 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, this disclosure is not limited to any particular combination of hardware and software.

The above description is merely an exemplary embodiment of this disclosure and is not intended to limit this disclosure. Various modifications and variations can be made to this disclosure by those skilled in the art. Any modifications, equivalent substitutions, improvements, etc., made within the principles of this disclosure should be included within the scope of protection of this disclosure.

Claims (26)

A method for measuring a reference signal, the method comprising: By performing multiple time-domain samplings, multiple reference signals of multiple candidate Transmitter Receiver Nodes (TRPs) are measured to obtain the measurement results of the multiple reference signals. The measurement results are used to determine the target TRP combination that provides services to the User Equipment from the multiple candidate TRPs. According to the method of claim 1, the measurement result includes at least one of the following: Reference signal received power; Received signal strength indication; Received signal amplitude; Received signal phase; Symbolic information of the received signal. The method according to claim 1, wherein the method further comprises: The user equipment receives downlink signaling sent by the base station, wherein the downlink signaling carries resource configuration information of the plurality of reference signals, and the resource configuration information is used to instruct the user equipment to receive the plurality of reference signals. According to the method of claim 3, the resource configuration information includes at least one of the following: time domain information, frequency domain information, and code domain information. According to the method of claim 1, the time-domain resources and/or frequency-domain resources of the plurality of reference signals are the same. According to the method of claim 1, wherein, The plurality of reference signals are sent by the plurality of candidate TRPs according to a preset period; or, The plurality of reference signals are transmitted continuously in the time domain by the plurality of candidate TRPs. According to the method of claim 1, wherein measuring multiple reference signals of multiple candidate transmit-receive nodes (TRPs) through multiple time-domain sampling to obtain measurement results of the multiple reference signals includes: Each of the plurality of reference signals is sampled multiple times in the time domain according to a preset period and a preset resource configuration, so as to obtain multiple measurement results of each reference signal in multiple time domain sampling periods, wherein each measurement result corresponds to one time domain sampling period and one reference signal. The method according to claim 1, wherein the method further comprises: The plurality of candidate TRPs are combined to obtain a plurality of candidate TRP combinations, wherein each candidate TRP combination contains a preset number of candidate TRPs; The measurement results of the reference signals corresponding to all candidate TRPs in each candidate TRP combination are calculated according to a preset calculation method to obtain the calculation result of each candidate TRP combination. The calculation result of the candidate TRP combination is used to determine the target TRP combination from the plurality of candidate TRP combinations. According to the method of claim 8, the preset calculation method and the preset quantity are notified to the user equipment by the base station via downlink signaling. According to the method of claim 8, the step of performing calculations on the measurement results of the reference signals corresponding to all candidate TRPs within each candidate TRP combination according to a preset calculation method to obtain the calculation result of each candidate TRP combination includes: According to a preset first calculation method, the measurement results of the reference signals corresponding to all candidate TRPs in each candidate TRP combination are calculated in each time domain sampling period to obtain multiple first calculation results, wherein each first calculation result corresponds to one candidate TRP combination and one time domain sampling period; According to the preset second calculation method, the first calculation result of each candidate TRP combination in all time domain sampling periods is calculated to obtain the calculation result of each candidate TRP combination. According to the method of claim 10, wherein, according to a preset first calculation method, the measurement results of the reference signals corresponding to all candidate TRPs in each candidate TRP combination in each time domain sampling period are calculated to obtain a plurality of first calculation results, including at least one of the following: For each time-domain sampling period, determine the superposition result of the measurement results of all reference signals corresponding to each candidate TRP combination; For each time-domain sampling period, determine the average value of the measurement results of all reference signals corresponding to each candidate TRP combination; For each time-domain sampling period, determine the magnitude of the superposition result of the measurement results of all reference signals corresponding to each candidate TRP combination; For each time-domain sampling period, determine the average value of the magnitude of the superposition of the measurement results of all reference signals corresponding to each candidate TRP combination; For each time-domain sampling period, determine the superposition result of the magnitudes of the measurement results of all reference signals corresponding to each candidate TRP combination; For each time-domain sampling period, the average value of the magnitude of the measurement results of all reference signals corresponding to each candidate TRP combination is determined. According to the method of claim 10, the calculation of the first calculation result of each candidate TRP combination in all time domain sampling periods according to a preset second calculation method, to obtain the calculation result of each candidate TRP combination, includes at least one of the following: Determine the superposition result of the modulus values of the first operation results of each candidate TRP combination across all time domain sampling periods; Determine the average value of the modulus of the first computation result for each candidate TRP combination across all time-domain sampling periods; Determine the superposition result of the first operation results of each candidate TRP combination across all time domain sampling periods; Determine the average value of the first computation result for each candidate TRP combination across all time-domain sampling periods; Determine the variance of the first computation result/magnitude of the first computation result for each candidate TRP combination across all time-domain sampling periods; Determine the standard deviation of the first computation result/the modulus of the first computation result for each candidate TRP combination across all time-domain sampling periods; Determine the range of the first operation result/first operation result modulus for each candidate TRP combination across all time domain sampling periods. The method according to claim 8, wherein the method further comprises: The target TRP combination is determined based on the calculation results of multiple candidate TRP combinations, and the target TRP combination is reported to the base station. The method according to claim 8, wherein the method further comprises: The calculation results of the multiple candidate TRP combinations are reported to the base station so that the base station can determine the target TRP combination from the multiple candidate TRPs based on the calculation results of the multiple candidate TRP combinations. A method for selecting a Transmitter Receiver (TRP), the method comprising: The measurement results of multiple reference signals transmitted by the user equipment are obtained, wherein the measurement results are obtained by the user equipment through multiple time-domain sampling of multiple reference signals of multiple candidate transmit-receive nodes (TRPs). Based on the measurement results, a target TRP combination for providing services to the user equipment is determined from a plurality of candidate TRPs. The method according to claim 15, wherein the measurement result includes at least one of the following: Reference signal received power; Received signal strength indication; Received signal amplitude; Received signal phase; Symbolic information of the received signal. The method according to claim 15, wherein the method further comprises: Downlink signaling is sent to the user equipment and the plurality of candidate TRPs, wherein the downlink signaling carries resource configuration information of the plurality of reference signals. According to the method of claim 17, the resource configuration information includes at least one of the following: time domain information, frequency domain information, and code domain information. The method according to claim 15, wherein the time-domain resources and/or frequency-domain resources of the plurality of reference signals are identical. The method of claim 15, wherein determining a target TRP combination for serving the user equipment from a plurality of candidate TRPs based on the measurement results includes: The plurality of candidate TRPs are combined to obtain a plurality of candidate TRP combinations, wherein each candidate TRP combination contains a preset number of candidate TRPs; The measurement results of the reference signals corresponding to all candidate TRPs in each candidate TRP combination are calculated according to the preset calculation method to obtain the calculation result of each candidate TRP combination; The target TRP combination is determined from the plurality of candidate TRP combinations based on the calculation results of the candidate TRP combinations. According to the method of claim 20, the step of performing calculations on the measurement results of the reference signals corresponding to all candidate TRPs within each candidate TRP combination according to a preset calculation method to obtain the calculation result of each candidate TRP combination includes: According to a preset first calculation method, the measurement results of the reference signals corresponding to all candidate TRPs in each candidate TRP combination are calculated in each time domain sampling period to obtain multiple first calculation results, wherein each first calculation result corresponds to one candidate TRP combination and one time domain sampling period; According to the preset second calculation method, the first calculation result of each candidate TRP combination in all time domain sampling periods is calculated to obtain the calculation result of each candidate TRP combination. According to the method of claim 21, wherein, according to a preset first calculation method, the measurement results of the reference signals corresponding to all candidate TRPs in each candidate TRP combination in each time domain sampling period are calculated to obtain a plurality of first calculation results, including at least one of the following: For each time-domain sampling period, determine the superposition result of the measurement results of all reference signals corresponding to each candidate TRP combination; For each time-domain sampling period, determine the average value of the measurement results of all reference signals corresponding to each candidate TRP combination; For each time-domain sampling period, determine the magnitude of the superposition result of the measurement results of all reference signals corresponding to each candidate TRP combination; For each time-domain sampling period, determine the average value of the magnitude of the superposition of the measurement results of all reference signals corresponding to each candidate TRP combination; For each time-domain sampling period, determine the superposition result of the magnitudes of the measurement results of all reference signals corresponding to each candidate TRP combination; For each time-domain sampling period, the average value of the magnitude of the measurement results of all reference signals corresponding to each candidate TRP combination is determined. According to the method of claim 21, wherein, according to a preset second calculation method, the first calculation result of each candidate TRP combination in all time-domain sampling periods is calculated to obtain the calculation result of each candidate TRP combination, including at least one of the following: Determine the superposition result of the modulus values of the first operation results of each candidate TRP combination across all time domain sampling periods; Determine the average value of the modulus of the first computation result for each candidate TRP combination across all time-domain sampling periods; Determine the superposition result of the first operation results of each candidate TRP combination across all time domain sampling periods; Determine the average value of the first computation result for each candidate TRP combination across all time-domain sampling periods; Determine the variance of the first computation result/magnitude of the first computation result for each candidate TRP combination across all time-domain sampling periods; Determine the standard deviation of the first computation result/the modulus of the first computation result for each candidate TRP combination across all time-domain sampling periods; Determine the range of the first operation result/first operation result modulus for each candidate TRP combination across all time domain sampling periods. A computer-readable storage medium storing a computer program, wherein the computer program, when executed by a processor, performs the method according to any one of claims 1 to 23. An electronic device includes a memory and a processor, the memory storing a computer program, and the processor being configured to run the computer program to perform the method according to any one of claims 1 to 23. A computer program product comprising a computer program that, when executed by a processor, implements the steps of the method according to any one of claims 1 to 23.