Channel acquisition method and device, channel configuration method and device, communication equipment and storage medium
By measuring the channel information between one TRP and the terminal and using a channel estimation model, the channel information between other TRPs and the terminal is estimated, thus solving the problem of large pilot overhead and improving the system's spectral efficiency.
Patent Information
- Authority / Receiving Office
- CN · China
- Patent Type
- Applications(China)
- Current Assignee / Owner
- CHINA MOBILE COMM LTD RES INST
- Filing Date
- 2024-10-24
- Publication Date
- 2026-04-24
AI Technical Summary
The pilot overhead used for channel measurement in existing technologies is large, resulting in low system spectral efficiency.
By measuring the channel information between one TRP and the terminal, the channel estimation model is used to estimate the channel information between other TRPs and the terminal, thereby reducing pilot overhead.
While maintaining the channel estimation accuracy essentially unchanged, pilot overhead is effectively reduced and system spectral efficiency is improved.
Smart Images
Figure CN121923746A_ABST
Abstract
Description
Technical Field
[0001] This application belongs to the field of wireless technology, specifically relating to a channel acquisition method, configuration method, apparatus, communication device, and storage medium. Background Technology
[0002] Multiple Transmission and Reception Point (TRP) transmission can improve communication coverage, throughput for cell edge users, and transmission reliability. In multi-TRP scenarios, TRP cooperative transmission can be achieved through Joint Transmission (JT), or diversity transmission can be used. Currently, when performing channel measurements on different TRPs, the terminal typically receives pilot signals transmitted by different TRPs and measures the channel information between the terminal and each TRP. This indicates that the pilot signal overhead currently used for channel measurement is relatively large. Summary of the Invention
[0003] The purpose of this application is to provide a channel acquisition method, configuration method, apparatus, communication device, and storage medium to solve the problem of large pilot overhead in current channel measurement.
[0004] To solve the above-mentioned technical problems, this application is implemented as follows:
[0005] Firstly, a channel acquisition method is provided, applied to a terminal, including:
[0006] The terminal receives the first pilot signal;
[0007] The terminal measures the first channel information between the first transceiver node (TRP) and the terminal based on the first pilot signal, wherein the first TRP corresponds to the first pilot signal.
[0008] The terminal estimates the second channel information between the second TRP and the terminal based on the first channel information.
[0009] Secondly, a configuration method is provided for network-side devices, including:
[0010] Network-side devices send configuration information to the terminal;
[0011] The configuration information includes at least one of the following:
[0012] A first pilot transmission mode, wherein the first pilot transmission mode corresponds to the channel variation characteristics of the terminal;
[0013] TRP number and the order in which different TRPs transmit pilots;
[0014] Pilot configuration information.
[0015] Thirdly, a channel acquisition device is provided, applied to a terminal, comprising:
[0016] The first receiving module is used to receive the first pilot signal;
[0017] The measurement module is used to measure the first channel information between the first transceiver node (TRP) and the terminal based on the first pilot signal, wherein the first TRP corresponds to the first pilot signal.
[0018] The estimation module is used to estimate the second channel information between the second TRP and the terminal based on the first channel information.
[0019] Fourthly, a configuration device is provided for use in network-side equipment, comprising:
[0020] The first sending module is used to send configuration information to the terminal;
[0021] The configuration information includes at least one of the following:
[0022] A first pilot transmission mode, wherein the first pilot transmission mode corresponds to the channel variation characteristics of the terminal;
[0023] TRP number and the order in which different TRPs transmit pilots;
[0024] Pilot configuration information.
[0025] Fifthly, a communication device is provided, including a processor, a memory, and a program or instructions stored in the memory and executable on the processor, wherein the program or instructions, when executed by the processor, implement the steps of the method described in the first aspect, or the steps of the method described in the second aspect.
[0026] In a sixth aspect, a readable storage medium is provided, on which a program or instructions are stored, which, when executed by a processor, implement the steps of the method described in the first aspect, or the steps of the method described in the second aspect.
[0027] In a seventh aspect, a computer program product is provided, including computer instructions that, when executed by a processor, implement the steps of the method described in the first aspect, or the steps of the method described in the second aspect.
[0028] In this embodiment, the terminal can receive a first pilot signal, which corresponds to a first TRP. Based on the first pilot signal, first channel information between the first TRP and the terminal is measured, and based on the first channel information, second channel information between the second TRP and the terminal is estimated. Therefore, the channel information between other TRPs and the terminal can be estimated by measuring the channel information between one TRP and the terminal, thereby effectively reducing pilot overhead and improving system spectral efficiency while maintaining essentially the same channel estimation accuracy. Attached Figure Description
[0029] Figure 1 This is a flowchart of a channel acquisition method provided in an embodiment of this application;
[0030] Figure 2 This is a schematic diagram of data sampling points on the time-frequency domain resource grid in an embodiment of this application;
[0031] Figure 3A and Figure 3B This is a schematic diagram of a correlation-based channel estimation model in an embodiment of this application;
[0032] Figure 4 This is a flowchart of a configuration method provided in an embodiment of this application;
[0033] Figure 5 This is a schematic diagram of the channel acquisition process in a specific embodiment of this application;
[0034] Figure 6 This is a schematic diagram of the structure of a channel acquisition device provided in an embodiment of this application;
[0035] Figure 7 This is a schematic diagram of the structure of a configuration device provided in an embodiment of this application;
[0036] Figure 8 This is a schematic diagram of the structure of a communication device provided in an embodiment of this application. Detailed Implementation
[0037] The technical solutions of the embodiments of this application will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of this application, not all embodiments. Based on the embodiments of this application, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of this application.
[0038] The terms "first," "second," etc., used in the specification and claims of this application are used to distinguish similar objects and not to describe a specific order or sequence. It should be understood that such use of data can be interchanged where appropriate so that embodiments of this application can be implemented in orders other than those illustrated or described herein, and the objects distinguished by "first," "second," etc., are generally of the same class and the number of objects is not limited; for example, a first object can be one or more. Furthermore, in the specification and claims, "and / or" indicates at least one of the connected objects, and the character " / " generally indicates that the preceding and following objects are in an "or" relationship.
[0039] To address the issue of high pilot overhead in current channel measurement methods, and considering the correlation between channels between different TRPs and the same terminal, this application proposes a low-pilot-overhead channel acquisition method. This method estimates the channel information between other TRPs and the terminal by measuring the channel information between one TRP and the terminal, thereby effectively reducing pilot overhead and improving system spectral efficiency while maintaining the channel estimation accuracy essentially unchanged.
[0040] The channel correlation proposed in this application refers to the correlation between multiple TRPs and the same terminal.
[0041] The channel acquisition method, configuration method, apparatus, communication device, and storage medium provided in this application will be described in detail below with reference to the accompanying drawings and through specific embodiments and application scenarios.
[0042] Please see Figure 1 , Figure 1 This is a flowchart of a channel acquisition method provided in an embodiment of this application. This method is applied to a terminal, such as... Figure 1 As shown, the method includes the following steps:
[0043] Step 11: The terminal receives the first pilot signal;
[0044] Step 12: The terminal measures the first channel information between the first TRP and the terminal based on the first pilot signal, wherein the first TRP corresponds to the first pilot signal;
[0045] Step 13: The terminal estimates the second channel information between the second TRP and the terminal based on the first channel information.
[0046] In this embodiment, the first TRP is a TRP accessed by the terminal. The second TRP is any other TRP accessed by the terminal besides the first TRP. The second TRP can be a single TRP, i.e., the channel information between another TRP and the terminal is estimated by measuring the channel information between one TRP and the terminal; or it can include multiple TRPs, i.e., the channel information between multiple other TRPs and the terminal is estimated by measuring the channel information between one TRP and the terminal.
[0047] The first pilot corresponds to the first TRP, such as when the first TRP sends the first pilot to the terminal.
[0048] For the method of obtaining the first channel information between the first TRP and the terminal based on the first pilot measurement, existing channel measurement methods can be used, and there is no limitation on this.
[0049] Optionally, when estimating the second channel information between the second TRP and the terminal, the estimation can be based on pre-obtained channel correlation or on a pre-trained channel estimation model. This channel estimation model can be an Artificial Intelligence (AI) model.
[0050] The scheme of this application embodiment can estimate the channel information between other TRPs and the terminal by measuring the channel information between one TRP and the terminal, thereby effectively reducing pilot overhead and improving system spectrum efficiency while keeping the channel estimation accuracy basically unchanged.
[0051] Optionally, a channel estimation model can be introduced for channel estimation. The estimation of the second channel information between the second TRP and the terminal based on the first channel information can include: the terminal estimating the second channel information between the second TRP and the terminal using the channel estimation model based on the first channel information; wherein the channel estimation model is used to characterize the correlation between the channel information between the first TRP and the terminal and the channel information between the second TRP and the terminal. This channel estimation model is pre-trained. The output of the channel estimation model can include channel information between one or more TRPs and the terminal; that is, the channel information between one or more other TRPs and the terminal can be estimated based on the channel information between one TRP and the terminal. Therefore, channel estimation can be achieved accurately and efficiently using the channel estimation model.
[0052] It should be noted that the channel estimation model described above can have a one-to-one or one-to-many relationship with the TRP group accessed by the terminal. For example, when the terminal accesses two TRPs, such as TRP1 and TRP2, when using the channel estimation model for channel estimation, the channel information of TRP2 can be predicted / estimated based on the channel information of TRP1, and the channel information of TRP1 can be predicted / estimated based on the channel information of TRP2. These two prediction / estimate processes are performed alternately. Alternatively, this one-to-many relationship can involve simultaneously predicting / estimated channel information of multiple TRPs using the channel information of one TRP. For example, when a terminal accesses four TRPs, such as TRP1, TRP2, TRP3, and TRP4, a possible prediction / estimation method is to first predict / estimate the channel information of TRP2, TRP3, and TRP42 simultaneously based on the channel information of TRP1. Then, at the next moment, predict / estimate the channel information of TRP3, TRP4, and TRP1 simultaneously based on the channel information of TRP2. Then, at the next moment, predict / estimate the channel information of TRP2, TRP3, and TRP42 simultaneously based on the channel information of TRP1, and so on. These two prediction / estimation processes are performed alternately.
[0053] For example, suppose there are four TRPs: TRP1, TRP2, TRP3, and TRP4. In a one-to-one relationship, the TRP group TRP1 and TRP2 corresponds to channel estimation model 1, meaning that when a terminal accesses TRP1 and TRP2, channel estimation is performed based on channel estimation model 1. The TRP group TRP3 and TRP4 corresponds to channel estimation model 2, meaning that when a terminal accesses TRP3 and TRP4, channel estimation is performed based on channel estimation model 2. The TRP group TRP1 and TRP4 corresponds to channel estimation model 3, meaning that when a terminal accesses TRP1 and TRP4, channel estimation is performed based on channel estimation model 3. And so on. Alternatively, in a one-to-many relationship, channel estimation model 4 can correspond to TRP group 1 (containing TRP1 and TRP2), TRP group 2 (containing TRP1 and TRP3), and TRP group 3 (containing TRP3 and TRP4). That is, when a terminal accesses TRP1 and TRP2, or TRP1 and TRP3, or TRP3 and TRP4, channel estimation can be performed based on channel estimation model 4.
[0054] In one optional implementation, the channel estimation model (such as an AI model) can be trained using a radio access network model training system. This model training system can be deployed in a centralized unit (CU) and / or a distributed unit (DU) on the network side, or it can be deployed on a logical entity spanning multiple CUs. During model training, the system can pre-collect downlink channel estimation data, terminal location, sampling time, etc., corresponding to different TRPs, and train the model based on the collected data. After completing model training, the system can synchronize the trained model and its corresponding model number to the terminal and / or base station for convenient use.
[0055] For data acquisition, since the terminal position and speed remain constant, and the surrounding scattering objects remain constant, the corresponding channel remains constant. That is, the channel experienced by the terminal moving from the same location point A to another location point B with the same trajectory and speed can be considered constant. However, thermal noise during data acquisition can affect the channel. Therefore, the following data acquisition strategy can be adopted: Multiple data acquisitions are performed using the same trajectory. Within a set period, the acquisition terminal moves from the same location point to another location point multiple times with the same trajectory and speed, and sampling points are configured in the time-frequency domain according to a pre-set pilot configuration mode. Multiple samplings should be configured at equal intervals. Taking the terminal accessing two TRPs, with corresponding channels H1(t) and H2(t), as an example, the following configuration can be adopted in the time domain, with the two recorded sampling points being t. i and t , i The corresponding relationship is t i =t , i +Δt(i=1,2,…), then the schematic diagram of the collected data can be as follows Figure 2 As shown, the channel data corresponding to the channel acquisition time is recorded.
[0056] For example, assuming a terminal accesses two TRPs, TRP1 and TRP2, with corresponding channels H1(t) and H2(t), the required AI model for channel estimation can be trained as follows: Figure 3A and Figure 3B As shown. Figure 3A The model shown is {w 1j ,w 2j}(j=1,2,…), w 1j Used to estimate the location of the terminal, w 2jThis is used to characterize the correlation between channel information between a TRP and a terminal at this location and channel information between other TRPs and terminals. j represents the number of AI models used for channel estimation. For example, at time t4, model w... 1j The input information can include t1, t2, H1(t1), H2(t2), t3, t4, H1(t3), and H2(t4), and the corresponding output is the terminal position P(t4); model w 2j The input information can include t2, t3, t4, P(t2), H2(t2), P(t3), H1(t3), P(t4), and H2(t4) (this is the channel information corresponding to the measured TRP2), and the corresponding output is H1(t4), that is, obtaining the channel information corresponding to TRP1 at time t4. For example, at time t5, model w... 1j The input information can include t3, t2, H1(t3), H2(t2), t4, t5, H2(t4), and H1(t5), and the corresponding output is the terminal position P(t5); model w 2j The input information can include t3, t4, t5, P(t3), H1(t3), P(t4), H2(t4), P(t5), and H1(t5) (this is the channel information corresponding to the measured TRP1), and the corresponding output is H2(t5), that is, the channel information corresponding to TRP2 at t5 is obtained.
[0057] Figure 3B The model shown is {w j}(j=1,2,…), w j This is used to characterize the correlation between channel information between a TRP and a terminal and channel information between other TRPs and terminals, where j represents the number of AI models used for channel estimation. For example, at time t4, w j The input information can include t1, t2, H1(t1), H2(t2), t3, t4, H1(t3), and H2(t4) (this is the channel information corresponding to the measured TRP2), and the corresponding output is H1(t4), that is, the channel information corresponding to TRP1 at time t4 is obtained. For example, at time t5, w j The input information can include t3, t2, H1(t3), H2(t2), t4, t5, H2(t4), and H1(t5) (this is the channel information corresponding to the measured TRP1), and the corresponding output is H2(t5), that is, the channel information corresponding to TRP2 at t5 is obtained.
[0058] It should be pointed out that, Figure 3A and Figure 3B The model shown is for illustrative purposes only and can be adjusted according to actual needs. Figure 3A and Figure 3BThe information within the dashed box is optional input information. In addition, the input information for the channel estimation model can generally include the channel's corresponding frequency domain location and port location. If the terminal accesses multiple TRPs, the input information of the above model must include channel information between at least one TRP and the terminal, and the output information can include channel information between one or more other TRPs and the terminal.
[0059] In this embodiment, to effectively achieve channel estimation, the network side can set multiple pilot transmission modes, each corresponding to different channel variation characteristics. The smaller the channel variation characteristics, the sparser the pilots configured in the corresponding pilot transmission mode. For example, a conventional pilot transmission mode and at least two unconventional pilot transmission modes can be set. The conventional pilot transmission mode can be understood as the currently existing pilot transmission mode, and the unconventional pilot transmission mode can also be called a correlation transmission mode. In the unconventional pilot transmission mode, the channel information between one or more other TRPs and the terminal can be estimated based on the channel information between one TRP and the terminal using a channel estimation model (such as an AI model).
[0060] Optionally, after setting multiple pilot transmission modes, the network side can configure a corresponding pilot transmission mode for the terminal according to changes in the terminal channel. Before receiving the first pilot, the channel acquisition method in this embodiment may further include:
[0061] The terminal receives configuration information sent by the network-side device; wherein the configuration information may include at least one of the following:
[0062] The first pilot transmission mode corresponds to the channel variation characteristics of the terminal; different pilot transmission modes correspond to different channel variation characteristics, and the smaller the channel variation characteristics, the sparser the pilots configured in the corresponding pilot transmission mode.
[0063] TRP number and the order in which different TRPs transmit pilots;
[0064] Pilot configuration information; for example, the pilot configuration information may include at least one of the following: the period of the first pilot transmission mode, the number of pilots in the period of the first pilot transmission mode (i.e., the number of pilots in one period of the first pilot transmission mode), pilot time domain resources, etc.
[0065] This allows the terminal to know the mode of pilot transmission on the network side, the order in which different TRPs transmit pilots, etc., so as to accurately receive pilots and then estimate the channel information between one or more other TRPs and the terminal based on the measured channel information between one TRP and the terminal.
[0066] Optionally, the first pilot transmission mode can use different TRPs to transmit pilots in turn to improve the accuracy of channel estimation.
[0067] Optionally, the channel variation characteristics of the terminal may include any of the following: no change, a change less than or equal to a first value, or a change greater than a second value. The first value is less than or equal to the second value. When the change is less than or equal to the first value, it indicates a minor channel change. When the change is greater than the second value, it indicates a drastic channel change.
[0068] Optionally, considering that there is not enough channel data to support the operation of the channel estimation model when it is first started, and the model can only be supported when there is sufficient channel data, the pilot resources corresponding to the first pilot transmission mode may include a first resource part and a second resource part. The second resource part includes at least one resource sub-part. The pilot insertion situation of each resource sub-part is the same. The pilots inserted in the first resource part are denser than the pilots inserted in each resource sub-part. The pilots in the first resource part are used to obtain information to support the operation of the channel estimation model. The pilots in each resource sub-part are used to estimate the channel information between other TRPs and terminals that are different from the TRP based on the channel information between a TRP and the terminal through the channel estimation model.
[0069] For example, assuming the network side supports a maximum of one terminal accessing two TRPs simultaneously, then the network side supports a maximum of two TRPs sending pilot signals in turn. When the number of TRPs accessed by the terminal is two, bit=0 can be used to indicate that TRP1 sends pilot signals, and bit=1 can be used to indicate that TRP2 sends pilot signals. Since a certain number of channel estimation values need to be accumulated based on the input of the channel estimation model before the model can be used to infer the channel relationship, two resource parts can be configured when configuring the pilot resources corresponding to the pilot transmission mode, as shown in the first resource part and the second resource part above. The first resource part inserts relatively dense pilot signals. For example, the first resource part can be represented as the first group, in which four TRP pilot resources can be set to complete the channel estimation for different TRPs; the second resource part can be represented as the other group. To save pilot signals, the time-frequency interval of the pilot signals in the other group is larger than that in the first group, as shown in Table 1 below.
[0070] Table 1
[0071] Pilot transmission mode serial number first group other group Combination form 1 01 0101 0101 <![CDATA[0101
[0101] N1 ]]> 2 10 0101 0101 <![CDATA[0101
[0101] N2 ]]>
[0072] In Table 1 above, [] NThis indicates repetition N times. The unconventional pilot transmission modes include pilot transmission modes 1 and 2, corresponding to numbers 01 and 10 respectively; the pilot resources corresponding to pilot transmission modes 1 and 2 are such that a groupsize contains one first group and multiple other groups. In the first group, the pilot positions of the TRP can be configured in the existing manner, and in the other groups... Ni Configuration modes include N i One cycle, i = 1 or 2, the downlink pilot occupies one time slot. Therefore, the other group can contain a total of symbols. The location for inserting pilot signals. If If N1 ≥ N2, then the pilot signals inserted in pilot transmission mode 1 are sparser than those inserted in pilot transmission mode 2. Furthermore, for conventional pilot transmission mode 3, the corresponding number can be 11.
[0073] Please see Figure 4 , Figure 4 This is a flowchart illustrating a channel acquisition method provided in an embodiment of this application. This method is applied to network-side devices, such as base stations. Figure 4 As shown, the method includes the following steps:
[0074] Step 41: The network-side device sends configuration information to the terminal.
[0075] In this embodiment of the application, the configuration information may include at least one of the following:
[0076] The first pilot transmission mode corresponds to the channel variation characteristics of the terminal. The first pilot transmission mode can be configured by the network-side device according to the channel correlation of the terminal. Different pilot transmission modes correspond to different channel variation characteristics, and the smaller the channel variation characteristics, the sparser the pilots configured in the corresponding pilot transmission mode.
[0077] TRP number and the order in which different TRPs transmit pilots;
[0078] Pilot configuration information; for example, the pilot configuration information may include at least one of the following: the period of the first pilot transmission mode, the number of pilots in the period of the first pilot transmission mode (i.e., the number of pilots in one period of the first pilot transmission mode), pilot time domain resources, etc.
[0079] It should be noted that the network-side device can update the above configuration information based on changes in the terminal's access TRP and channel correlation, and then send it to the terminal.
[0080] This allows the terminal to know the mode of pilot transmission from the network side, the order in which different TRPs transmit pilots, etc., so as to accurately receive pilots. Then, based on the measured channel information between one TRP and the terminal, the channel information between one or more other TRPs and the terminal can be estimated, thereby effectively reducing pilot overhead while maintaining the channel estimation accuracy basically unchanged.
[0081] Optionally, the first pilot transmission mode may use different TRPs to transmit pilots in turn to improve the accuracy of channel estimation.
[0082] Optionally, the channel variation characteristics of the terminal may include any of the following: no change, a change less than or equal to a first value, or a change greater than a second value. The first value is less than or equal to the second value. When the change is less than or equal to the first value, it indicates a minor channel change. When the change is greater than the second value, it indicates a drastic channel change.
[0083] Optionally, considering that there is not enough channel data to support the operation of the channel estimation model when it is first started, and the model can only be supported when there is sufficient channel data, the pilot resources corresponding to the first pilot transmission mode may include a first resource part and a second resource part. The second resource part includes at least one resource sub-part. The pilot insertion situation of each resource sub-part is the same. The pilots inserted in the first resource part are denser than the pilots inserted in each resource sub-part. The pilots in the first resource part are used to obtain information to support the operation of the channel estimation model. The pilots in each resource sub-part are used to estimate the channel information between other TRPs and terminals that are different from the TRP based on the channel information between a TRP and the terminal through the channel estimation model.
[0084] Optionally, after sending configuration information to the terminal as described above, the method in this embodiment may further include:
[0085] The network-side device sends a first pilot to the terminal according to the configuration information; wherein the first pilot corresponds to a first TRP, and the first pilot is used to measure the first channel information between the first TRP and the terminal, and to estimate the second channel information between the second TRP and the terminal based on the first channel information.
[0086] In this embodiment, the first pilot transmission mode can be selected by the network-side device based on the terminal channel correlation, that is, different pilot transmission modes are selected according to different channel variation characteristics. The greater the channel correlation, the sparser the configurable pilots. Before sending configuration information to the terminal, the configuration method may further include:
[0087] The network-side device acquires a first channel correlation of a first channel and a second channel correlation of a second channel; wherein, the first channel is the channel between a third TRP and the terminal, and the second channel is the channel between a fourth TRP and the terminal; the third TRP is a TRP accessed by the terminal, which may be the same as or different from the first TRP; the fourth TRP is another TRP accessed by the terminal besides the third TRP, which may be the same as or different from the second TRP; the first channel correlation is the channel correlation of the first channel at adjacent times or the degree of channel change, which can be obtained by, but is not limited to, calculating cosine similarity; the second channel correlation is the channel correlation of the second channel at adjacent times or the degree of channel change, which can be obtained by, but is not limited to, calculating cosine similarity.
[0088] The network-side device selects a first pilot transmission mode from at least two pilot transmission modes based on the first channel correlation and the second channel correlation. The at least two pilot transmission modes satisfy the following conditions: different pilot transmission modes correspond to different channel variation characteristics, and the smaller the channel variation characteristic, the sparser the pilots configured in the corresponding pilot transmission mode. For example, thresholds can be set based on actual conditions, such as the number of thresholds depending on the number of pilot transmission modes. The matching pilot transmission mode is selected based on a comparison between the first and second channel correlations and the corresponding thresholds. The corresponding principle is: the more drastic the channel variation, i.e., the smaller the channel correlation, the denser the inserted pilots.
[0089] Optionally, the first channel correlation and the second channel correlation can be calculated by the terminal and sent to the network-side device, or they can be calculated by the network-side device itself; there is no limitation on this.
[0090] Optionally, the at least two pilot transmission modes include two pilot transmission modes (i.e., two unconventional pilot transmission modes); the selection of the first pilot transmission mode from the at least two pilot transmission modes based on the first channel correlation and the second channel correlation may include:
[0091] When the minimum of the first channel correlation and the second channel correlation is greater than the first threshold, the channel correlation is considered high. If there is no change in channel correlation, the second pilot transmission mode of the two pilot transmission modes is determined as the first pilot transmission mode. Alternatively, when the minimum of the first channel correlation and the second channel correlation is less than or equal to the first threshold, or when the maximum of the first channel correlation and the second channel correlation is greater than the second threshold, the channel correlation is considered low. If there is a significant change in channel correlation, the third pilot transmission mode of the two pilot transmission modes is determined as the first pilot transmission mode. Wherein, the first threshold is greater than the second threshold, and the pilots configured in the second pilot transmission mode are sparser than those configured in the third pilot transmission mode. By comparing the channel correlation with the threshold, a suitable pilot transmission mode can be selected quickly and accurately.
[0092] Optionally, when the maximum of the first channel correlation and the second channel correlation is less than or equal to the second threshold, the network-side device may select a conventional pilot transmission mode and transmit pilots according to the conventional pilot transmission mode.
[0093] Optionally, obtaining the first channel correlation of the first channel and the second channel correlation of the second channel may include: the network-side device receiving multiple third channel information at different times of the first channel sent by the terminal, and receiving multiple fourth channel information at different times of the second channel sent by the terminal; calculating the cosine similarity of two third channel information at adjacent times among the multiple third channel information to obtain the first channel correlation, and calculating the cosine similarity of two fourth channel information at adjacent times among the multiple fourth channel information to obtain the second channel correlation.
[0094] For example, consider a terminal accessing two TRPs, TRP1 and TRP2, with corresponding channels H1(t) and H2(t). If the channel correlation between adjacent time points is represented using cosine similarity, then when calculating the channel correlation, the two channel matrices at adjacent time points can be stretched into vectors column-wise, and the inner product of the two vectors can be divided by the product of the 2-norms of the two vectors, as shown in the following formula:
[0095]
[0096] In the above formula, H i (t) represents the channel corresponding to the terminal at time t, TRP i. i (t, t+1) represents the time correlation between TRP i and the channel corresponding to the terminal at times t and t+1.
[0097] Taking the pilot transmission modes 1 and 2 shown in Table 1 above, and the conventional pilot transmission mode 3 set on the network side as examples, pilot transmission mode 1 inserts the sparsest pilots, while pilot transmission mode 3 inserts the densest pilots. Mode 1 can be used to adapt to channels with no change, mode 2 to adapt to channels with slight changes, and mode 3 to adapt to channels with drastic changes. Since the denser the inserted pilots should be when the channel changes more drastically, a threshold δ can be set based on channel correlation. 11 and δ 21 , and δ 11 >δ 21 The pilot transmission mode can be selected as follows: 1) When min(S1(t,t+1),S2(t,t+1))>δ 11 When, pilot transmission mode 1 is selected; 2) when max(S1(t,t+1),S2(t,t+1))≤δ 21 When the pilot signal is active, pilot transmission mode 3 is selected; otherwise, pilot transmission mode 2 is selected.
[0098] The present application will now be described in conjunction with specific embodiments.
[0099] In a specific embodiment of this application, taking the terminal accessing two TRPs, namely TRP1 and TRP2, and their corresponding channels being H1(t) and H2(t), as an example, ... Figure 5 As shown, the specific channel estimation process includes:
[0100] S1: The model training system (deployment details are as described above) pre-collects downlink channel estimation data, terminal location, sampling time, etc., corresponding to different TRPs, and trains a multi-TRP-based channel estimation model based on the collected data. Afterwards, the trained model and its corresponding model number are synchronized to the terminal. The specific form of this channel estimation model can be found above and will not be repeated here.
[0101] In addition, the network side (such as the base station) can set two types of pilot transmission modes: regular transmission mode and related transmission mode (i.e., unconventional transmission mode). This related transmission mode includes, for example, pilot transmission mode 1 and pilot transmission mode 2 in Table 1 above, and sets a corresponding threshold δ for the related transmission mode. 11 and δ 21 (δ 11 >δ 21 ).
[0102] S2: The terminal accesses the network and enters the RRC-CONNECTED state.
[0103] S3: The network-side equipment selects the set of TRP nodes to be accessed by the cooperative cluster based on the Reference Signal Received Power (RSRP) and Block Error Rate (BLER) measured by the terminal, and coordinates the access to the TRPs to transmit pilot signals (such as Channel State Information Reference Signals (CSI-RS)). If the terminal accesses a single TRP, S7-S8 are executed; if the terminal accesses multiple TRPs, the corresponding threshold group is selected based on the accessed TRPs, such as δ. 11 and δ 21 And execute S4-S6, or execute S4, S5 and S8.
[0104] S4: The terminal measures the channel corresponding to the access TRP, calculates and reports the channel correlation.
[0105] S5: The network-side device compares the channel correlation reported by the terminal with the threshold, selects the corresponding pilot transmission mode based on the comparison result, sends the pilot transmission mode number to the terminal, and transmits the pilot according to the pilot transmission mode. For example, when min(S1(t,t+1),S2(t,t+1))>δ 11 When the maximum value of max(S1(t,t+1),S2(t,t+1)) ≤ δ is selected, pilot transmission mode 1 is used; when max(S1(t,t+1),S2(t,t+1)) ≤ δ 21 In such cases, pilot transmission mode 3 should be selected; otherwise, pilot transmission mode 2 should be selected.
[0106] Optionally, if the selected pilot transmission mode is the normal transmission mode, then execute S8; and if the selected pilot transmission mode is the correlated transmission mode, then execute S6.
[0107] S6: The terminal estimates the channel information between the corresponding TRP and the terminal based on the received pilot signal, and estimates the channel information between the terminal and other TRPs on the corresponding time-frequency resources based on the obtained channel estimation model.
[0108] S7: Network-side devices send pilot signals in the standard pilot signal transmission mode.
[0109] S8: The terminal estimates the channel information between the corresponding TRP and the terminal based on the received pilot signal.
[0110] S9: Subsequently, the network side updates the configuration based on the changes in the access TRP and the changes in channel correlation, including the pilot transmission mode, TRP number and corresponding pilot transmission order, pilot configuration information (such as pilot transmission mode period, number of pilots in one mode period, etc.); then repeat the above S3-S8.
[0111] It should be noted that the channel acquisition method provided in this application embodiment can be executed by a channel acquisition device or a control module within that channel acquisition device for executing the channel acquisition method. This application embodiment uses the execution of the channel acquisition method by a channel acquisition device as an example to illustrate the channel acquisition device provided in this application embodiment.
[0112] Please see Figure 6 , Figure 6 This is a schematic diagram of a channel acquisition device provided in an embodiment of this application. This device is applied to a terminal, such as... Figure 6 As shown, the channel acquisition device 60 includes:
[0113] The first receiving module 61 is used to receive the first pilot signal;
[0114] Measurement module 62 is used to measure and obtain first channel information between the first TRP and the terminal based on the first pilot, wherein the first TRP corresponds to the first pilot;
[0115] The estimation module 63 is used to estimate the second channel information between the second TRP and the terminal based on the first channel information.
[0116] Optionally, the estimation module 63 is specifically used to: estimate the second channel information between the second TRP and the terminal based on the first channel information using a channel estimation model; wherein the channel estimation model is used to characterize the correlation between the channel information between the first TRP and the terminal and the channel information between the second TRP and the terminal.
[0117] Optionally, the channel acquisition device 60 further includes:
[0118] The second receiving module is used to receive configuration information sent by the network-side device; wherein the configuration information includes at least one of the following:
[0119] A first pilot transmission mode, wherein the first pilot transmission mode corresponds to the channel variation characteristics of the terminal;
[0120] TRP number and the order in which different TRPs transmit pilots;
[0121] Pilot configuration information.
[0122] Optionally, the channel variation characteristics of the terminal include any of the following: no change, a change degree lower than or equal to a first value, or a change degree greater than a second value.
[0123] Optionally, the first pilot transmission mode uses different TRPs to transmit pilots in turn.
[0124] Optionally, the pilot resources corresponding to the first pilot transmission mode include a first resource portion and a second resource portion. The second resource portion includes at least one resource sub-part. The pilot insertion situation is the same for each resource sub-part. The pilots inserted in the first resource portion are more dense than the pilots inserted in each resource sub-part. The pilots in the first resource portion are used to obtain information supporting the operation of the channel estimation model. The pilots in each resource sub-part are used to estimate the channel information between other TRPs and terminals, which is different from the TRP, based on the channel information between a TRP and the terminal through the channel estimation model.
[0125] Optionally, the pilot configuration information includes at least one of the following: the period of the first pilot transmission mode and the number of pilots within the period of the first pilot transmission mode.
[0126] The channel acquisition device 60 of this application embodiment can achieve the above-mentioned... Figure 1 The various processes of the method embodiments shown can achieve the same technical effect, and will not be described again here to avoid repetition.
[0127] Please see Figure 7 , Figure 7 This is a schematic diagram of a configuration device provided in an embodiment of this application. This device is applied to network-side equipment, such as... Figure 7 As shown, the configuration device 70 includes:
[0128] The first sending module 71 is used to send configuration information to the terminal; wherein the configuration information includes at least one of the following:
[0129] A first pilot transmission mode, wherein the first pilot transmission mode corresponds to the channel variation characteristics of the terminal;
[0130] TRP number and the order in which different TRPs transmit pilots;
[0131] Pilot configuration information.
[0132] Optionally, the channel variation characteristics of the terminal include any of the following: no change, a change degree lower than or equal to a first value, or a change degree greater than a second value.
[0133] Optionally, the pilot resources corresponding to the first pilot transmission mode include a first resource portion and a second resource portion. The second resource portion includes at least one resource sub-part. The pilot insertion situation is the same for each resource sub-part. The pilots inserted in the first resource portion are more dense than the pilots inserted in each resource sub-part. The pilots in the first resource portion are used to obtain information supporting the operation of the channel estimation model. The pilots in each resource sub-part are used to estimate the channel information between other TRPs and terminals, which is different from the TRP, based on the channel information between a TRP and the terminal through the channel estimation model.
[0134] Optionally, the configuration device 70 also includes:
[0135] The second transmitting module is configured to transmit a first pilot to the terminal according to the configuration information; wherein the first pilot corresponds to a first TRP, and the first pilot is used to measure the first channel information between the first TRP and the terminal, and to estimate the second channel information between the second TRP and the terminal based on the first channel information.
[0136] Optionally, the configuration device 70 also includes:
[0137] The acquisition module is used to acquire the first channel correlation of the first channel and the second channel correlation of the second channel; wherein, the first channel is the channel between the third TRP and the terminal, and the second channel is the channel between the fourth TRP and the terminal;
[0138] The selection module is used to select the first pilot transmission mode from at least two pilot transmission modes based on the first channel correlation and the second channel correlation; wherein the at least two pilot transmission modes satisfy the following: different pilot transmission modes correspond to different channel change characteristics, and the smaller the channel change characteristics, the sparser the pilots configured in the corresponding pilot transmission mode.
[0139] Optionally, the at least two pilot transmission modes include two pilot transmission modes; the selection module is specifically used to: determine the second pilot transmission mode as the first pilot transmission mode when the minimum of the first channel correlation and the second channel correlation is greater than a first threshold; or, determine the third pilot transmission mode as the first pilot transmission mode when the minimum of the first channel correlation and the second channel correlation is less than or equal to the first threshold, or when the maximum of the first channel correlation and the second channel correlation is greater than a second threshold; wherein the pilots configured in the second pilot transmission mode are sparser than the pilots configured in the third pilot transmission mode.
[0140] Optionally, when the maximum of the first channel correlation and the second channel correlation is less than or equal to the second threshold, the selection module is further configured to select a conventional pilot transmission mode;
[0141] The second transmitting module is also used to transmit pilot signals according to the conventional pilot transmission mode.
[0142] Optionally, the acquisition module is specifically used for:
[0143] Receive multiple third channel information at different times from the first channel sent by the terminal, and receive multiple fourth channel information at different times from the second channel sent by the terminal;
[0144] Calculate the cosine similarity between two adjacent third channel information items in the plurality of third channel information items to obtain the first channel correlation, and calculate the cosine similarity between two adjacent fourth channel information items in the plurality of fourth channel information items to obtain the second channel correlation.
[0145] The configuration device 70 of this application embodiment can achieve the above-described... Figure 4 The various processes of the method embodiments shown can achieve the same technical effect, and will not be described again here to avoid repetition.
[0146] Optional, such as Figure 8 As shown, this application embodiment also provides a communication device 80, including a processor 81, a memory 82, and a program or instructions stored in the memory 82 and executable on the processor 81. For example, when the communication device 80 is a terminal, the program or instructions executed by the processor 81 implement the above-mentioned... Figure 1 The various processes of the channel acquisition method embodiment shown can achieve the same technical effect. When the communication device 80 is a network-side device, the program or instruction executed by the processor 81 implements the above. Figure 4 The various processes of the configuration method embodiments shown can achieve the same technical effect, and will not be described again here to avoid repetition.
[0147] This application also provides a computer program product, including computer instructions, which, when executed by a processor, can perform the above-described functions. Figure 1 or Figure 4 The various processes of the method embodiments shown can achieve the same technical effect, and will not be described again here to avoid repetition.
[0148] This application also provides a readable storage medium storing a program or instructions. When the program or instructions are executed by a processor, they can implement the various processes of the above-described channel acquisition method embodiments and achieve the same technical effect. To avoid repetition, they will not be described again here.
[0149] Computer-readable media include both permanent and non-permanent, removable and non-removable media, which can store information using any method or technology. Information can be computer-readable instructions, data structures, modules of programs, or other data. Examples of computer storage media include, but are not limited to, phase-change memory (PRAM), static random access memory (SRAM), dynamic random access memory (DRAM), other types of random access memory (RAM), read-only memory (ROM), electrically erasable programmable read-only memory (EEPROM), flash memory or other memory technologies, CD-ROM, digital versatile optical disc (DVD) or other optical storage, magnetic tape, magnetic disk storage or other magnetic storage devices, or any other non-transferable medium that can be used to store information accessible by a computing device. As defined herein, computer-readable media does not include transient computer-readable media, such as modulated data signals and carrier waves.
[0150] It should be noted that, in this document, the terms "comprising," "including," or any other variations thereof are intended to cover non-exclusive inclusion, such that a process, method, article, or apparatus that comprises a list of elements includes not only those elements but also other elements not expressly listed, or elements inherent to such a process, method, article, or apparatus. Unless otherwise specified, an element defined by the phrase "comprising one..." does not exclude the presence of other identical elements in the process, method, article, or apparatus that includes that element.
[0151] The sequence numbers of the embodiments in this application are for descriptive purposes only and do not represent the superiority or inferiority of the embodiments.
[0152] Through the above description of the embodiments, those skilled in the art can clearly understand that the methods of 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 application, 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 service classification device (which may be a mobile phone, computer, server, air conditioner, or network device, etc.) to execute the methods described in the various embodiments of this application.
[0153] The above description is only a preferred embodiment of this application. It should be noted that for those skilled in the art, several improvements and modifications can be made without departing from the principle of this application, and these improvements and modifications should also be considered within the scope of protection of this application.
Claims
1. A channel acquisition method, characterized in that, include: The terminal receives the first pilot signal; The terminal measures the first channel information between the first transceiver node (TRP) and the terminal based on the first pilot signal, wherein the first TRP corresponds to the first pilot signal. The terminal estimates the second channel information between the second TRP and the terminal based on the first channel information.
2. The method according to claim 1, characterized in that, The step of estimating the second channel information between the second TRP and the terminal based on the first channel information includes: The terminal estimates the second channel information between the second TRP and the terminal using a channel estimation model based on the first channel information; wherein, the channel estimation model is used to characterize the correlation between the channel information between the first TRP and the terminal and the channel information between the second TRP and the terminal.
3. The method according to claim 1 or 2, characterized in that, The method further includes: The terminal receives configuration information sent by the network-side device; The configuration information includes at least one of the following: A first pilot transmission mode, wherein the first pilot transmission mode corresponds to the channel variation characteristics of the terminal; TRP number and the order in which different TRPs transmit pilots; Pilot configuration information.
4. The method according to claim 3, characterized in that, The channel variation characteristics of the terminal include any of the following: no change, a change degree lower than or equal to a first value, or a change degree greater than a second value.
5. The method according to claim 3, characterized in that, The first pilot transmission mode uses different TRPs to transmit pilots in turn.
6. The method according to claim 3, characterized in that, The pilot resources corresponding to the first pilot transmission mode include a first resource portion and a second resource portion. The second resource portion includes at least one resource sub-part. The pilot insertion situation is the same for each resource sub-part. The pilots inserted in the first resource portion are more dense than the pilots inserted in each resource sub-part. The pilots in the first resource portion are used to obtain information supporting the operation of the channel estimation model. The pilots in each resource sub-part are used to estimate the channel information between other TRPs and terminals, which is different from the TRP, based on the channel information between a TRP and the terminal through the channel estimation model.
7. The method according to claim 3, characterized in that, The pilot configuration information includes at least one of the following: the period of the first pilot transmission mode and the number of pilots within the period of the first pilot transmission mode.
8. A configuration method, characterized in that, include: Network-side devices send configuration information to the terminal; The configuration information includes at least one of the following: A first pilot transmission mode, wherein the first pilot transmission mode corresponds to the channel variation characteristics of the terminal; TRP number and the order in which different TRPs transmit pilots; Pilot configuration information.
9. The method according to claim 8, characterized in that, The channel variation characteristics of the terminal include any of the following: no change, a change degree lower than or equal to a first value, or a change degree greater than a second value.
10. The method according to claim 8, characterized in that, The pilot resources corresponding to the first pilot transmission mode include a first resource portion and a second resource portion. The second resource portion includes at least one resource sub-part. The pilot insertion situation is the same for each resource sub-part. The pilots inserted in the first resource portion are more dense than the pilots inserted in each resource sub-part. The pilots in the first resource portion are used to obtain information supporting the operation of the channel estimation model. The pilots in each resource sub-part are used to estimate the channel information between other TRPs and terminals, which is different from the TRP, based on the channel information between a TRP and the terminal through the channel estimation model.
11. The method according to claim 8, characterized in that, The method further includes: The network-side device sends a first pilot to the terminal according to the configuration information; wherein the first pilot corresponds to a first TRP, and the first pilot is used to measure the first channel information between the first TRP and the terminal, and to estimate the second channel information between the second TRP and the terminal based on the first channel information.
12. The method according to claim 8, characterized in that, Before sending configuration information to the terminal, the method further includes: The network-side device acquires a first channel correlation of a first channel and a second channel correlation of a second channel; wherein, the first channel is the channel between the third TRP and the terminal, and the second channel is the channel between the fourth TRP and the terminal; The network-side device selects the first pilot transmission mode from at least two pilot transmission modes based on the first channel correlation and the second channel correlation; wherein the at least two pilot transmission modes satisfy the following: different pilot transmission modes correspond to different channel change characteristics, and the smaller the channel change characteristics, the sparser the pilots configured in the corresponding pilot transmission mode.
13. The method according to claim 12, characterized in that, The at least two pilot transmission modes include two pilot transmission modes; the step of selecting the first pilot transmission mode from the at least two pilot transmission modes based on the first channel correlation and the second channel correlation includes: When the minimum of the first channel correlation and the second channel correlation is greater than a first threshold, the second pilot transmission mode of the two pilot transmission modes is determined as the first pilot transmission mode; or, when the minimum of the first channel correlation and the second channel correlation is less than or equal to the first threshold, or when the maximum of the first channel correlation and the second channel correlation is greater than a second threshold, the third pilot transmission mode of the two pilot transmission modes is determined as the first pilot transmission mode; wherein, the pilots configured in the second pilot transmission mode are sparser than the pilots configured in the third pilot transmission mode.
14. The method according to claim 13, characterized in that, When the maximum of the first channel correlation and the second channel correlation is less than or equal to a second threshold, the method further includes: The network-side device selects the conventional pilot transmission mode and transmits pilots according to the conventional pilot transmission mode.
15. The method according to claim 12, characterized in that, The network-side device obtains the first channel correlation of the first channel and the second channel correlation of the second channel, including: The network-side device receives multiple third channel information at different times from the first channel sent by the terminal, and receives multiple fourth channel information at different times from the second channel sent by the terminal. The network-side device calculates the cosine similarity of two adjacent third channel information in the plurality of third channel information to obtain the first channel correlation, and calculates the cosine similarity of two adjacent fourth channel information in the plurality of fourth channel information to obtain the second channel correlation.
16. A channel acquisition device, characterized in that, include: The first receiving module is used to receive the first pilot signal; The measurement module is used to measure the first channel information between the first TRP and the terminal based on the first pilot, wherein the first TRP corresponds to the first pilot. The estimation module is used to estimate the second channel information between the second TRP and the terminal based on the first channel information.
17. A configuration device, characterized in that, include: The first sending module is used to send configuration information to the terminal; The configuration information includes at least one of the following: A first pilot transmission mode, wherein the first pilot transmission mode corresponds to the channel variation characteristics of the terminal; TRP number and the order in which different TRPs transmit pilots; Pilot configuration information.
18. A communication device, characterized in that, It includes a processor, a memory, and a program or instructions stored in the memory and executable on the processor, wherein the program or instructions, when executed by the processor, implement the steps of the method as claimed in any one of claims 1 to 6, or the steps of the method as claimed in any one of claims 7 to 15.
19. A readable storage medium, characterized in that, The readable storage medium stores a program or instructions that, when executed by a processor, implement the steps of the method as described in any one of claims 1 to 6, or the steps of the method as described in any one of claims 7 to 15.
20. A computer program product, characterized in that, Includes computer instructions that, when executed by a processor, implement the steps of the method as claimed in any one of claims 1 to 6, or the steps of the method as claimed in any one of claims 7 to 15.