Channel state information determination method, configuration information sending method, and apparatus

Abstract

The present application relates to the technical field of communications, and discloses a channel state information (CSI) determination method, a configuration information sending method, and an apparatus. The CSI determination method in embodiments of the present application comprises: a terminal receives first configuration information sent by a network side device, and receives, on the basis of the first configuration information, a first reference signal corresponding to P1 antenna ports and a second reference signal corresponding to P2 antenna ports, wherein P2>P1, and the first configuration information is used for configuring the first reference signal and the second reference signal; the terminal receives second configuration information, the second configuration information being used for indicating configuration of CSI reports corresponding to the P2 antenna ports; and the terminal determines CSI of the P2 antenna ports on the basis of the first reference signal or the second reference signal, and reports the CSI on the basis of the second configuration information, wherein the first reference signal is associated with K mapping relationships, and the mapping relationships are mapping relationships between the P1 antenna ports and the P2 antenna ports.

Description

Channel state information determination method, configuration information transmission method and apparatus

[0001] Cross-reference to related applications

[0002] This application claims priority to Chinese Patent Application No. 202510493694.5, filed in China on April 18, 2025, the entire contents of which are incorporated herein by reference. Technical Field

[0003] This application belongs to the field of communication technology, and specifically relates to a method for determining channel state information, a method for transmitting configuration information, and an apparatus. Background Technology

[0004] In related technologies, Channel State Information Reference Signal (CSI-RS) is commonly used for channel measurement, and the resource overhead of transmitting CSI-RS is proportional to the number of CSI-RS ports. With the development of communication technology, the number of antenna ports is increasing; for example, Release 19 increases the maximum number of supported CSI-RS ports to 128. As the number of antenna ports increases, resource overhead increases significantly. Furthermore, according to existing port mapping configuration methods, the resource overhead of pilot signals used for channel measurement (such as CSI-RS) will also increase significantly, leading to a reduction in time-frequency resources available for communication and ultimately affecting communication capacity. Summary of the Invention

[0005] This application provides a method for determining channel state information, a method for sending configuration information, and an apparatus that can solve the problem of increased resource overhead of pilots used for channel measurement in related technologies.

[0006] Firstly, a method for determining channel state information is provided, executed by a terminal, the method comprising:

[0007] The terminal receives first configuration information sent by the network-side device, and receives a first reference signal corresponding to P1 antenna ports and a second reference signal corresponding to P2 antenna ports according to the first configuration information, where P2 > P1 and P1 and P2 are both positive integers. The first configuration information is used to configure the first reference signal and the second reference signal.

[0008] The terminal receives second configuration information, which is used to indicate the configuration of the Channel State Information (CSI) report for the P2 antenna ports;

[0009] The terminal determines the CSI of the P2 antenna ports based on the first reference signal or the second reference signal, and reports the CSI based on the second configuration information;

[0010] The first reference signal is associated with K mapping relationships, which are the mapping relationships between the P1 antenna ports and the P2 antenna ports.

[0011] Secondly, a method for sending configuration information is provided, executed by a network-side device, the method comprising:

[0012] The network-side device sends the first configuration information and the second configuration information to the terminal.

[0013] Wherein, the first configuration information is used to configure a first reference signal corresponding to P1 antenna ports and a second reference signal corresponding to P2 antenna ports, where P2 > P1, and P1 and P2 are both positive integers. The first reference signal is associated with K mapping relationships, and the mapping relationship is the mapping relationship between the P1 antenna ports and the P2 antenna ports.

[0014] The second configuration information is used to indicate the configuration of the CSI reports corresponding to the P2 antenna ports.

[0015] Thirdly, a channel state information determination device is provided, comprising:

[0016] The first receiving module is used to receive first configuration information sent by the network-side device, and to receive a first reference signal corresponding to P1 antenna ports and a second reference signal corresponding to P2 antenna ports according to the first configuration information, where P2 > P1 and P1 and P2 are both positive integers. The first configuration information is used to configure the first reference signal and the second reference signal.

[0017] The second receiving module is used to receive second configuration information, which is used to indicate the configuration of CSI reports for the P2 antenna ports;

[0018] The first transmitting module is configured to determine the CSI of the P2 antenna ports based on the first reference signal or the second reference signal, and report the CSI based on the second configuration information.

[0019] The first reference signal is associated with K mapping relationships, which are the mapping relationships between the P1 antenna ports and the P2 antenna ports.

[0020] Fourthly, a configuration information transmitting device is provided, comprising:

[0021] The second sending module is used to send the first configuration information and the second configuration information to the terminal.

[0022] Wherein, the first configuration information is used to configure a first reference signal corresponding to P1 antenna ports and a second reference signal corresponding to P2 antenna ports, where P2 > P1, and P1 and P2 are both positive integers. The first reference signal is associated with K mapping relationships, and the mapping relationship is the mapping relationship between the P1 antenna ports and the P2 antenna ports.

[0023] The second configuration information is used to indicate the configuration of the CSI reports corresponding to the P2 antenna ports.

[0024] Fifthly, a communication device is provided, the device being configured to perform the steps of the method described in the first aspect, or to implement the steps of the method described in the second aspect.

[0025] In a sixth aspect, a terminal is provided, the terminal including a processor and a memory, the memory storing a program or instructions executable on the processor, the program or instructions, when executed by the processor, implementing the steps of the method as described in the first aspect.

[0026] In a seventh aspect, a terminal is provided, including a processor and a communication interface, wherein the communication interface is used for:

[0027] The system receives first configuration information sent by a network-side device, and receives a first reference signal corresponding to P1 antenna ports and a second reference signal corresponding to P2 antenna ports according to the first configuration information, where P2 > P1 and P1 and P2 are both positive integers. The first configuration information is used to configure the first reference signal and the second reference signal; and...

[0028] Receive second configuration information, which is used to indicate the configuration of CSI reports for the P2 antenna ports;

[0029] The processor is used to determine the channel state information (CSI) of the P2 antenna ports based on the first reference signal or the second reference signal, and the communication interface is used to report the CSI based on the second configuration information.

[0030] The first reference signal is associated with K mapping relationships, which are the mapping relationships between the P1 antenna ports and the P2 antenna ports.

[0031] Eighthly, a network-side device is provided, the network-side device including a processor and a memory, the memory storing a program or instructions executable on the processor, the program or instructions, when executed by the processor, implementing the steps of the method as described in the second aspect.

[0032] Ninthly, a network-side device is provided, including a processor and a communication interface, wherein the communication interface is used for:

[0033] Send the first configuration information and the second configuration information to the terminal;

[0034] Wherein, the first configuration information is used to configure a first reference signal corresponding to P1 antenna ports and a second reference signal corresponding to P2 antenna ports, where P2 > P1, and P1 and P2 are both positive integers. The first reference signal is associated with K mapping relationships, and the mapping relationship is the mapping relationship between the P1 antenna ports and the P2 antenna ports.

[0035] The second configuration information is used to indicate the configuration of the CSI reports corresponding to the P2 antenna ports.

[0036] In a tenth 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 implement the steps of the method described in the second aspect.

[0037] Eleventhly, a wireless communication system is provided, comprising: a terminal and a network-side device, wherein the terminal can be used to perform the steps of the method as described in the first aspect, and the network-side device can be used to perform the steps of the method as described in the second aspect.

[0038] In a twelfth aspect, a chip is provided, the chip including a processor and a communication interface coupled to the processor, the processor being configured to run a program or instructions to implement the steps of the method described in the first aspect, or to implement the steps of the method described in the second aspect.

[0039] In a thirteenth aspect, a computer program / program product is provided, the computer program / program product being stored in a storage medium, the computer program / program product being executed by at least one processor to implement the steps of the method as described in the first or second aspect.

[0040] In this embodiment, after receiving a first reference signal with P1 antenna ports and a second reference signal with P2 antenna ports, the terminal can determine the CSI of the P2 antenna ports based on either the first or second reference signal and send it to the network-side device. Here, P2 > P1. This allows the terminal to determine the CSI of the P2 antenna ports not only based on the second reference signal but also based on the first reference signal, which has fewer antenna ports, making the CSI determination method more flexible. Furthermore, the terminal can determine the channel state information of the P2 antenna ports corresponding to the second reference signal based on the low-overhead first reference signal, which helps save energy consumption of the network-side device and pilot overhead for channel measurement. Attached Figure Description

[0041] Figure 1 is a block diagram of a wireless communication system applicable to an embodiment of this application;

[0042] Figure 2a is a schematic diagram of one of the reference signal transmission scenarios applicable to the embodiments of this application;

[0043] Figure 2b is a second schematic diagram of a reference signal transmission scenario applicable to the embodiments of this application;

[0044] Figure 3 is a flowchart of a channel state information determination method provided in an embodiment of this application;

[0045] Figures 4a to 4g are schematic diagrams illustrating the application of the channel state information determination method provided in the embodiments of this application.

[0046] Figure 5 is a flowchart of a configuration information sending method provided in an embodiment of this application;

[0047] Figure 6 is a structural diagram of a channel state information determination device provided in an embodiment of this application;

[0048] Figure 7 is a structural diagram of a configuration information sending device provided in an embodiment of this application;

[0049] Figure 8 is a structural diagram of a communication device provided in an embodiment of this application;

[0050] Figure 9 is a structural diagram of a terminal provided in an embodiment of this application;

[0051] Figure 10 is a structural diagram of a network-side device provided in an embodiment of this application. Detailed Implementation

[0052] The technical solutions of the embodiments of this application will be clearly described below with reference to the accompanying drawings. Obviously, the described embodiments are only some, not all, of the embodiments of this application. All other embodiments obtained by those skilled in the art based on the embodiments of this application are within the scope of protection of this application.

[0053] The terms "first," "second," etc., used in this application are used to distinguish similar objects and not to describe a specific order or sequence. It should be understood that such terms can be used interchangeably 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" and "second" are generally of the same class, not limited in number; for example, the first object can be one or more. Furthermore, "or" in this application indicates at least one of the connected objects. For example, the scope of protection for "A or B" covers at least three scenarios: Scenario 1: including A but not B; Scenario 2: including B but not A; Scenario 3: including both A and B. In addition, the terms "A and / or B," "at least one of A and B," and "at least one of A or B" also cover at least the above three scenarios. The character " / " generally indicates that the preceding and following objects are in an "or" relationship.

[0054] In this application, A corresponds to B, which can be understood as a relationship between A and B.

[0055] The term "instruction" in this application can be either a direct instruction (or explicit instruction) or an indirect instruction (or implicit instruction). A direct instruction can be understood as the sender explicitly informing the receiver of specific information, the required operation, or the requested result in the instruction sent. An indirect instruction can be understood as the receiver determining the corresponding information based on the instruction sent by the sender, or making a judgment and determining the required operation or requested result based on the judgment result.

[0056] It is worth noting that the technologies described in this application are not limited to Long Term Evolution (LTE) / LTE-Advanced (LTE-A) systems, but can also be used in other wireless communication systems, such as Code Division Multiple Access (CDMA), Time Division Multiple Access (TDMA), Frequency Division Multiple Access (FDMA), Orthogonal Frequency Division Multiple Access (OFDMA), Single-carrier Frequency-Division Multiple Access (SC-FDMA), or other systems. The terms "system" and "network" in this application are often used interchangeably, and the described technologies can be used with the systems and radio technologies mentioned above, as well as with other systems and radio technologies. The following description describes New Radio (NR) systems for illustrative purposes, and the term NR is used in most of the following description; however, these technologies can also be applied to systems other than NR systems, such as 6th generation (6G) radio systems. th Generation 6G communication system.

[0057] Figure 1 shows a block diagram of a wireless communication system applicable to an embodiment of this application. The wireless communication system includes a terminal 11 and a network-side device 12. The terminal 11 can also be referred to as User Equipment (UE), and can be a mobile phone, tablet computer, laptop computer, notebook computer, personal digital assistant (PDA), handheld computer, netbook, ultra-mobile personal computer (UMPC), mobile internet device (MID), augmented reality (AR), virtual reality (VR) device, robot, wearable device, flight vehicle, vehicle user equipment (VUE), shipboard equipment, pedestrian user equipment (PUE), smart home (home devices with wireless communication capabilities, such as refrigerators, televisions, washing machines, or furniture), game console, personal computer (PC), ATM, or self-service machine, etc. Wearable devices include: smartwatches, smart bracelets, smart headphones, smart glasses, smart jewelry (smart bracelets, smart chains, smart rings, smart necklaces, smart anklets, smart anklets, etc.), smart wristbands, smart clothing, etc. Among these, in-vehicle devices can also be referred to as in-vehicle terminals, in-vehicle controllers, in-vehicle modules, in-vehicle components, in-vehicle chips, or in-vehicle units, etc. It should be noted that the specific type of terminal 11 is not limited in this application embodiment. Network-side equipment 12 may include access network equipment or core network equipment, wherein access network equipment may also be referred to as Radio Access Network (RAN) equipment, radio access network function, or radio access network unit. Access network equipment may include base stations, Wireless Local Area Network (WLAN) access points (APs), or Wireless Fidelity (WiFi) nodes, etc.Among them, base stations can be referred to as Node B (NB), Evolved Node B (eNB), Next Generation Node B (gNB), New Radio Node B (NR Node B), Access Point, Relay Base Station (RBS), Serving Base Station (SBS), Base Transceiver Station (BTS), Radio Base Station, Radio Transceiver, Basic Service Set (BSS), Extended Service Set (ESS), Home Node B (HNB), Home Evolved Node B, Transmit / Receive Point (TRP), Non-Terrestrial Network (NTN) equipment (such as satellite or high altitude platform stations). The term "base station" can be any suitable term in the field, such as "station" or any other appropriate term in the relevant field, as long as the same technical effect is achieved. The term "base station" is not limited to any specific technical term. It should be noted that the embodiments of this application only use the base station in the NR system as an example for introduction, and do not limit the specific type of base station.

[0058] Core network equipment, also known as core network nodes, core network functions, or core network elements, includes, but is not limited to, at least one of the following: Mobility Management Entity (MME), Access and Mobility Management Function (AMF), Session Management Function (SMF), User Plane Function (UPF), Policy Control Function (PCF), Policy and Charging Rules Function (PCRF), Edge Application Server Discovery Function (EASDF), Unified Data Management (UDM), Unified Data Repository (UDR), Home Subscriber Server (HSS), Centralized network configuration (CNC), Network Repository Function (NRF), Network Exposure Function (NEF), Local NEF (L-NEF), and Binding Support. Functions include BSF, Application Function (AF), Location Management Function (LMF), Gateway Mobile Location Centre (GMLC), Network Data Analytics Function (NWDAF), and Non-Terrestrial Network (NTN) equipment (such as satellite or high altitude platform station).It should be noted that the embodiments of this application only use the core network equipment in the NR system as an example for introduction, and do not limit the specific type of core network equipment. If the name of the core network equipment mentioned in the embodiments of this application changes in subsequent protocol versions (e.g., 6G), it is also within the scope of protection of this application.

[0059] Optionally, the core network equipment can be implemented by one or more functional modules in a single device, or by multiple devices working together; this application does not specifically limit this. It is understood that the aforementioned functional modules can be network elements in hardware devices, software functional modules running on dedicated hardware, or virtualized functional modules instantiated on a platform (e.g., a cloud platform).

[0060] In 5G communication systems, the introduction of massive multiple-input multiple-output (MIMO) antenna technology can significantly improve spectral efficiency, but it requires the base station to know downlink channel information in order to apply appropriate precoding to the data channel. For Frequency Division Duplex (FDD), uplink and downlink channels are not completely reciprocal, and the base station cannot directly obtain downlink channel information, requiring the terminal to feed back Channel State Information (CSI). For Time Division Duplex (TDD), although channel reciprocity exists, and channel estimation can be obtained through uplink pilots, such as Sounding Reference Signals (SRS), in some scenarios (e.g., for cell edge users), the signal-to-noise ratio of the uplink pilots is low, resulting in low accuracy of the obtained channel estimation, thus affecting user communication performance. In such cases, the terminal also needs to feed back CSI to obtain the channel information.

[0061] The network associates each CSI reporting configuration (CSI-ReportConfig) with a reference signal resource configuration (CSI-ResourceConfig) for channel measurement, an interference measurement reference signal resource configuration associated with CSI Interference Measurement (CSI-IM) resources, and / or an interference measurement reference signal resource configuration associated with Non-Zero Power CSI RS (NZP-CSI RS) resources. The terminal obtains the corresponding channel information by measuring the reference resources associated with these resource configurations, further obtains the corresponding CSI information based on the codebook configuration information and report content associated with the CSI report configuration, and provides uplink channel feedback.

[0062] The reference signal resource configuration (CSI-ResourceConfig) used for channel measurement is associated with at least one NZP CSI-RS resource set (NZP-CSI-RS-ResourceSet). For periodic and semi-persistent reporting, only one Channel State Information Reference Signal (CSI-RS) resource set is configured. For aperiodic reporting, multiple CSI-RS resource sets can be configured, but the base station will indicate which CSI-RS resource set to use for reporting. Each CSI-RS resource set will contain at least one CSI-RS resource (NZP-CSI-RS-Resource).

[0063] For periodic reporting, the base station configures it via Radio Resource Control (RRC). For semi-persistent reporting on the Physical Uplink Control Channel (PUCCH), the base station activates or deactivates it via the Medium Access Control Control Element (MAC-CE). For semi-persistent reporting on the Physical Uplink Shared Channel (PUSCH), the base station activates or deactivates it via Downlink Control Information (DCI).

[0064] The terminal will measure CSI-RS on the configured CSI-RS resources and feed back CSI according to the base station's configuration. CSI includes at least one of the following: Channel Quality Indicator (CQI), Rank Indicator (RI), Precoding Matrix Indicator (PMI), and Reference Signal Receiving Power (RSRP). PMI is reported in the form of a codebook, such as a Type-I codebook, Type-II codebook, eType-II codebook, or FeType-II codebook. It should be noted that the number of layers in PMI is the same as the number of layers indicated by RI (layers can also be understood as data streams or ranks), and the selectable values ​​for both are indicated by rank restrictions (e.g., ri-Restriction). CQI is calculated based on the reported PMI. The aforementioned CQI and PMI will be used by the base station to determine the precoding to be used for subsequent data transmission.

[0065] In order for the terminal to measure the channel, the base station needs to transmit downlink pilots. In existing NR protocols, the downlink pilot used for CSI measurements is usually CSI-RS.

[0066] In the time domain, CSI-RS resources can be configured as periodic, semi-persistent, or aperiodic. In the frequency domain, CSI-RS is typically transmitted over a frequency band, with a density that can be configured to 1 or 0.5. A density of 1 means that CSI-RS will be transmitted on all resource blocks (RBs) within the configured frequency band, while a density of 0.5 means that CSI-RS will be transmitted only on resource blocks with odd or even sequence numbers within the configured frequency band. Specifically, on each RB transmitting CSI-RS, the number of resource elements (REs) occupied by the CSI-RS is equal to the number of CSI-RS ports. Different ports on a CSI-RS resource can be multiplexed on the same time-frequency resource using code division.

[0067] For periodic or semi-persistent CSI-RS, the transmission time can be determined by the following formula (1):

[0068] in, n represents the number of time slots in a frame. f Indicates the system frame number (SFN). T represents the slot index in a frame. offsetT represents the time slot offset. CSI-RS This indicates the CSI-RS transmission cycle.

[0069] In addition, the base station also configures a power control offset for CSI-RS resources to determine the energy per resource element (EPRE) of the PDSCH, so as to be used to calculate CQI for feedback.

[0070] The antenna port index p for CSI-RS resources with no more than 32 ports is given by the following formula (2):

[0071] Where s represents the index of the code division OCC sequence used by the antenna port, N is the number of ports of the CSI-RS, and L represents the size of the CDM group used by the CSI-RS.

[0072] Prior to NR Rel-19, the maximum number of CSI-RS ports was 32. With the increase in the number of antennas, NR Rel-19 increased the maximum number of supported CSI-RS ports to 128, which is achieved through four 32-port CSI-RS resources.

[0073] In the current protocol design, the resource overhead of transmitting CSI-RS is proportional to the CSI-RS itself. In the future, as the antenna array size increases, for example to 512 ports, the resource overhead will increase significantly. To illustrate this more clearly, consider a CSI-RS with a period of 5ms, a frequency domain density of 0.5, a subcarrier spacing of 15kHz, a time slot of 1ms, consisting of 14 Orthogonal Frequency Division Multiplexing (OFDM) symbols, and 12 REs on one RB. Then, the resource overhead of a 32-port CSI-RS is 0.5*32 / 12 / 14 / 5 = 2%, while for a 512-port CSI-RS, the resource overhead is 0.5*512 / 12 / 14 / 5 = 32%. On the other hand, due to the time-varying nature of the channel, the overhead cannot be reduced by increasing the transmission period; otherwise, performance will be affected by CSI aging. Therefore, with the increase in antenna array size, the pilot overhead used for CSI measurements using existing channel measurement methods will become unacceptable.

[0074] As mentioned above, with the increasing size of antenna arrays, the pilot overhead used for CSI measurements becomes unacceptable using existing channel measurement methods. Therefore, this application proposes a channel state information determination method that can reduce the pilot overhead used for channel measurements while ensuring the performance of channel measurements.

[0075] The following section will first explain the relevant principles and concepts that may be involved in this application.

[0076] For convenience, the mathematical symbols used below are described as follows, where X H Let X represent the conjugate transpose of matrix X. -1 This represents finding the inverse of a matrix. and These represent rounding down or up on x, respectively, and mod(x,y) represents taking the remainder when x is divided by y. The relevant principles and basic processes involved in this application include the following steps:

[0077] Step 1: As shown in Figure 2a, the base station will configure and transmit a first reference signal (marked by a solid line in the figure) and a second reference signal (marked by a dashed line in the figure). The antenna port corresponding to the first reference signal in the frequency domain cell is a subset of the total antenna ports, and the transmission interval is short, for example, 5ms. The antenna port of the second reference signal corresponds to the entire set of antenna ports, and the transmission interval is longer, for example, once every 50ms. In addition, the base station needs to configure the mapping relationship between the ports of the first type of reference signal and the entire set of antenna ports. It should be noted that each transmission of the second reference signal in Figure 2a may also be multiple second reference signals (as shown in Figure 2b).

[0078] Step 2: Based on the second reference signal transmitted over a long period, the terminal can obtain the statistical covariance matrix in the spatial or spatial-frequency domain. Specifically, assume the number of antenna ports on the base station side is N. t Considering that the number of frequency domain units is N f The terminal can base its decisions on the received T second reference signals h. t (t=0,2,…,T-1), calculate the spatial frequency domain covariance matrix R according to the following formula (3):

[0079] Where h represents the spatial frequency domain channel, and its dimension is N. t N f ×1, where each element represents the channel corresponding to a specific frequency domain unit at a specific antenna port. When N f When the value is 1, the channel h degenerates into a spatial channel, and the corresponding R degenerates into a spatial covariance matrix.

[0080] Step 3: Using the estimated R obtained above, when the terminal receives the first reference signal transmitted in a short period, the channel corresponding to the full port set can be recovered. Specifically, assume that the spatial frequency domain channel corresponding to the first reference signal received by the terminal can be represented as h. s=Sh, where S is the spatial frequency domain selection matrix, with only one element in each row being 1 and the rest being 0, and h is the channel corresponding to the full port set. Then, the terminal can obtain an estimate of h according to the following formula (4):

[0081] Where I represents the identity matrix.

[0082] Step 4: The terminal determines and reports the channel state information based on the channels corresponding to the reconstructed full port set. The reporting method can be a codebook designed based on existing or future protocols, or CSI feedback based on artificial intelligence (AI) methods.

[0083] In this way, the terminal can obtain the channel corresponding to the full set of ports based on the low-overhead first reference signal (the antenna ports corresponding to the first type of reference signal in the frequency domain unit it occupies are a subset of the full set of antenna ports, so the resource overhead of each transmission is small). In addition, although the second reference signal corresponding to the full set of ports is still needed, it is mainly used to obtain statistical information, and since the statistical information remains stable over a long period of time, the transmission time interval can be longer, so the overall overhead is still small.

[0084] The channel state information determination method, apparatus, terminal, and network-side equipment provided in this application will be described in detail below with reference to the accompanying drawings and through some embodiments and application scenarios.

[0085] Please refer to Figure 3, which is a flowchart of a channel state information determination method provided in an embodiment of this application. The method is applied to a terminal. As shown in Figure 3, the method includes the following steps:

[0086] Step 301: The terminal receives the first configuration information sent by the network-side device, and receives the first reference signal corresponding to the P1 antenna ports and the second reference signal corresponding to the P2 antenna ports according to the first configuration information.

[0087] Where P2 > P1, and P1 and P2 are both positive integers. The first reference signal is associated with K mapping relationships, which are the mapping relationships between the P1 antenna ports and the P2 antenna ports.

[0088] Optionally, an antenna port can also be called a port, and may include a transmit port and a receive port. A transmit port can be understood as a virtual antenna recognized by the receiving device. Optionally, a port can refer specifically to a transmit port. For example, the reference signal transmitted by each transmit port can be an uncoded reference signal. Here, a transmit port can refer to an actual independent transceiver unit (TxRU). Optionally, a port (i.e., an antenna port) can also refer to a port after beamforming. For example, the reference signal transmitted by each port can be a precoded reference signal obtained by precoding the reference signal based on an angle vector. It is understood that if beamforming is applied to the reference signal, the number of ports can refer to the number of ports in the precoded reference signal. The number of ports in this precoded reference signal can be less than the number of transmit ports. The reference signal of each port can be transmitted through one or more frequency domain units. A receive port can be understood as the receiving antenna of the receiving device. For example, in downlink transmission, a receive port can refer to the receiving antenna of the terminal device. For example, the antenna port can be a CSI-RS port, a Demodulation Reference Signal (DMRS) port, a Sounding Reference Signal (SRS) port, etc.

[0089] In this embodiment, the first configuration information is used to configure the first reference signal and the second reference signal. Exemplarily, the first configuration information may indicate at least one of the following: the time-domain behavior (e.g., periodic, semi-persistent, or aperiodic), number of ports, resource configuration, and resource pattern of the reference signals (first reference signal and second reference signal). In some implementations, the first configuration information may be RRC, MAC-CE, DCI, or a System Information Block (SIB). Optionally, the first configuration information may be carried by multiple signaling protocols of different types.

[0090] In some implementations, the first reference signal corresponding to P1 antenna ports can also be understood as a first reference signal with P1 antenna ports, or P1 antenna ports corresponding to the first reference signal. It should be noted that the P1 antenna ports corresponding to the first reference signal can be understood as the antenna ports corresponding to the reference signal resources used to transmit the first reference signal in the frequency domain or time unit. The number of reference signal resources used to transmit the first reference signal is at least one, and the total number of antenna ports corresponding to at least one reference signal resource in the frequency domain or time unit is P1. The first reference signal can correspond to at least one reference signal resource. The P1 antenna ports corresponding to these reference signal resources in different frequency domain or time units can be different. In other words, the value of P1 can be different for different reference signal resources, and the corresponding antenna ports can also be different. For example, the first reference signal corresponds to ports #1 and #2 on reference signal resource #1, and the antenna ports corresponding to the first reference signal on reference signal resource #2 are ports #3 and #4. For example, the antenna ports corresponding to the first reference signal in different frequency domain units (or time units) may be different. For example, the first reference signal corresponds to port #1 and port #2 in frequency domain unit 1, and port #3 and port #4 in frequency domain unit 2.

[0091] The time unit can be a time slot, an orthogonal frequency division multiplex (OFDM) symbol, a frame, etc., or it can be a collection of multiple time slots, symbols, frames, etc., and this application does not make specific limitations in this regard. The frequency domain unit can be a resource element (RE) or a resource block (RB), or it can be a subband, or it can be a collection of multiple REs, RBs, or subbands, and this application does not make specific limitations in this regard.

[0092] In some implementations, the second reference signal corresponding to P2 antenna ports can also be understood as a second reference signal with P2 antenna ports, or the P2 antenna ports corresponding to the second reference signal. Optionally, the P2 antenna ports can be all antenna ports of the network-side device (e.g., a base station), or it can be understood that the network-side device includes P2 antenna ports. Alternatively, the P2 antenna ports can also be some antenna ports of the network-side device, and P2 > P1. In the embodiments of this application, the second reference signal corresponds to P2 antenna ports, and the first reference signal corresponds to P1 antenna ports, wherein there is a mapping relationship between the P1 antenna ports and the P2 antenna ports. The mapping relationship can be understood as follows: P1 antenna ports correspond to a subset of P2 antenna ports; or P1 antenna ports are a subset of P2 antenna ports, meaning P1 antenna ports are a subset of P2 antenna ports; or P1 antenna ports are mapped to a subset of P2 antenna ports; or a subset of P2 antenna ports are mapped to P1 antenna ports; or P1 antenna ports have the same index as a subset of P2 antenna ports; or P1 antenna ports are associated with a subset of P2 antenna ports corresponding to the codebook reported by the terminal, and the P2 antenna ports corresponding to the second reference signal are associated with the P2 antenna ports corresponding to the codebook reported by the terminal. For example, P1 antenna ports can be the first 5 antenna ports in P2 (i.e., P1 = 5); or P1 antenna ports can be antenna ports with odd-numbered indices in P2 (the indices of P2 antenna ports are arranged in order), etc., etc., which will not be specifically listed here.

[0093] Understandably, the mapping relationship between the P1 antenna ports corresponding to the first reference signal and the P2 antenna ports corresponding to the second reference signal includes K relationships. The P1 antenna ports corresponding to the first reference signal can be understood as the P1 antenna ports corresponding to at least one reference signal resource used to transmit the first reference signal in the frequency domain or time domain. The P1 antenna ports can be different subsets of the P2 antenna ports. In this way, the terminal can obtain channel information of different antenna ports in different frequency domains or time domains, enabling the terminal to make fuller use of the channel correlation in the frequency-spatial or time-spatial domains, and thus recover the channel information corresponding to the P2 antenna ports with higher accuracy.

[0094] For example, the P2 antenna ports include port #1, port #2, port #3, and port #4 (P2≥4), where port #1 and port #2 are subsets of the P2 antenna ports, and port #1, port #3, and port #4 are subsets of the P2 antenna ports, #2. The reference signal resources for transmitting the first reference signal include reference signal resource #1 and reference signal resource #2, where the antenna ports corresponding to reference signal resource #1 in different frequency domain units or time units are port #1 and port #2, and the antenna ports corresponding to reference signal resource #2 in different frequency domain units or time units are port #1, port #3, and port #4. Furthermore, the P1 antenna ports corresponding to the reference signal resources for transmitting the first reference signal in different frequency domain units or time units can be different subsets of the P2 antenna ports.

[0095] It should be noted that the first reference signal is associated with K mapping relationships, that is, the mapping relationship between the P1 antenna ports and the P2 antenna ports corresponding to the first reference signal includes K relationships. It can also be understood that there is a corresponding relationship between at least one reference signal resource or reference signal resource configuration used to transmit the first reference signal and the K mapping relationships.

[0096] Optionally, the first reference signal is associated with K mapping relationships, including at least one of the following:

[0097] The frequency domain unit associated with the first reference signal is associated with one of the K mapping relationships;

[0098] The time unit associated with the first reference signal is associated with one of the K mapping relationships.

[0099] It should be noted that the frequency domain unit associated with the first reference signal can be understood as a frequency domain unit used for transmitting the first reference signal, or a frequency domain unit used for receiving the first reference signal, or a frequency domain unit occupied by the first reference signal, or a frequency domain unit occupied by the reference signal resources associated with the first reference signal. Similarly, the time unit associated with the first reference signal can be understood as a time unit used for transmitting the first reference signal, or a time unit used for receiving the first reference signal, or a time unit occupied by the first reference signal, or a time unit occupied by the reference signal resources associated with the first reference signal.

[0100] In some implementations, the frequency domain unit associated with the first reference signal is associated with one of the K mapping relationships. That is, there is a mapping relationship between the P1 antenna ports corresponding to the different frequency domain units associated with the first reference signal and the P2 antenna ports corresponding to the second reference signal, and the mapping relationship is one of the K mapping relationships. It can also be understood that the P1 antenna ports corresponding to the frequency domain units associated with the first reference signal are some of the P2 antenna ports. Based on the mapping relationship, the terminal can determine the P2 antenna ports corresponding to the second reference signal.

[0101] In some implementations, the time unit associated with the first reference signal is associated with one of the K mapping relationships. That is, there is a mapping relationship between the P1 antenna ports corresponding to the first reference signal and the P2 antenna ports of the second reference signal at different time units associated with the first reference signal, and the mapping relationship is one of the K mapping relationships.

[0102] In this embodiment of the application, the terminal receives a first reference signal and a second reference signal sent by the network-side device, wherein the number of antenna ports corresponding to the first reference signal in the frequency domain unit it occupies is P1, and the number of antenna ports corresponding to the second reference signal in the frequency domain unit it occupies is P2.

[0103] It should be noted that the first reference signal can be CSI-RS, a demodulation reference signal (DMRS), or a tracking reference signal (TRS), etc.; the second reference signal can also be CSI-RS, DMRS, or TRS, and this application does not specifically limit it. The first reference signal and the second reference signal can have the same signal type, for example, the first reference signal is CSI-RS, and the second reference signal is also CSI-RS.

[0104] Optionally, the K mapping relationships between the P1 antenna ports corresponding to the first reference signal and the P2 antenna ports corresponding to the second reference signal can be sent to the terminal by the network-side device, or they can be agreed upon by the protocol or pre-configured. Therefore, based on the mapping relationships, the terminal can determine which antenna ports among the P2 antenna ports corresponding to the aforementioned P1 antenna ports.

[0105] Step 302: The terminal receives the second configuration information.

[0106] The second configuration information is used to indicate the configuration of the CSI reports corresponding to the P2 antenna ports; the terminal can also know the format of the CSI report based on the second configuration information, and thus know how to report the CSI.

[0107] For example, the second configuration information may indicate at least one of the following: the time-domain behavior of the CSI report (e.g., periodic, semi-periodic, or aperiodic), the reporting type, the frequency-domain granularity of the CSI report, the uplink resources used by the CSI report, the codebook type, and the configuration of the corresponding codebook.

[0108] Optionally, the second configuration information can be RRC, MAC-CE, DCI, or System Information Block (SIB). Optionally, the second configuration information can be carried by multiple signaling messages of different types.

[0109] Step 303: The terminal determines the CSI of the P2 antenna ports based on the first reference signal or the second reference signal, and reports the CSI based on the second configuration information.

[0110] Optionally, the CSI of the P2 antenna ports corresponding to the second reference signal can be understood as the index of the P2 ports corresponding to the reported codebook being the same as the index of the P2 antenna ports corresponding to the second reference signal.

[0111] In some implementations, after receiving a first reference signal corresponding to P1 antenna ports and a second reference signal corresponding to P2 antenna ports, the terminal determines and reports the CSI of the P2 antenna ports corresponding to the second reference signal based on the first reference signal. There is a mapping relationship between the P1 antenna ports and the P2 antenna ports corresponding to the first reference signal. P2 can be the total number of antenna ports of the network-side device, and the P1 antenna ports corresponding to the first reference signal are a subset of the total number of antenna ports of the network-side device, i.e., the P1 antenna ports are a part of the P2 antenna ports. Based on the first reference signal with P1 antenna ports and the mapping relationship, the terminal can determine the channel matrix of the total number of antenna ports of the network-side device, i.e., it can determine the channel matrix of the P2 antenna ports corresponding to the second reference signal. Therefore, the terminal can determine the CSI of the P2 antenna ports corresponding to the second reference signal and send the CSI to the network-side device. In this way, the terminal can determine the channel state information corresponding to the full antenna port based on the low-overhead first reference signal and feed it back. As a result, the network-side equipment can increase the transmission time interval of the second reference signal, that is, the transmission period of the second reference signal can be greater than the transmission period of the first reference signal. The network-side equipment does not need to frequently transmit the second reference signal based on the full antenna port, which helps to save the energy consumption of the network-side equipment and the pilot overhead used for channel measurement.

[0112] Of course, P2 can also be a subset of the antenna ports of the network-side device, where P2 > P1. The P1 antenna ports are a subset of the network-side device's antenna ports, meaning the P1 antenna ports are a part of the P2 antenna ports. Based on the first reference signal with P1 antenna ports and the mapping relationship, the terminal can determine the channel of the P2 antenna ports, and thus determine and report the channel state information of the P2 antenna ports to the network-side device. In this way, the terminal can also determine and report the channel state information corresponding to the P2 antenna ports based on the low-overhead first reference signal. This allows the network-side device to increase the transmission time interval of the second reference signal, meaning the transmission period of the second reference signal can be greater than the transmission period of the first reference signal. The network-side device then does not need to frequently transmit the second reference signal, which helps save energy consumption and pilot overhead for channel measurement.

[0113] In other implementations, after receiving a first reference signal with P1 antenna ports and a second reference signal with P2 antenna ports, the terminal can determine the CSI of the P2 antenna ports corresponding to the second reference signal based on the second reference signal and feed it back. It is understood that the number of antenna ports corresponding to the second reference signal can be all antenna ports of the network-side device, and the terminal can thus determine and feed back the CSI of the P2 antenna ports corresponding to the second reference signal based on the second reference signal.

[0114] In this embodiment, after receiving the first reference signal corresponding to P1 antenna ports and the second reference signal corresponding to P2 antenna ports, the terminal can determine the CSI of the P2 antenna ports corresponding to the second reference signal based on the first or second reference signal and send it to the network-side device. Here, P2 > P1. This allows the terminal to determine the CSI of the P2 antenna ports not only based on the second reference signal but also based on the first reference signal, which has fewer antenna ports, making the CSI determination method more flexible. Furthermore, the terminal can determine the channel state information of the P2 antenna ports corresponding to the second reference signal based on the low-overhead first reference signal. This allows the network-side device to increase the transmission interval of the second reference signal, eliminating the need for frequent transmission of the second reference signal based on the larger number of P2 antenna ports, thus saving energy consumption and pilot overhead for channel measurement.

[0115] Optionally, both the first reference signal and the second reference signal are associated with K1 reference signal resources;

[0116] The K mapping relationships are divided into K1 mapping relationship groups, and each mapping relationship group includes K2 mapping relationships. The K1 reference signal resources correspond one-to-one with the K1 mapping relationship groups. K1 and K2 are both positive integers. It can be understood that K = K1 × K2.

[0117] The mapping relationships in the mapping relationship group are used to indicate the mapping between the first antenna port and the second antenna port. The first antenna port is the antenna port corresponding to the first reference signal resource in the frequency domain unit or time unit. The P1 antenna ports include the first antenna port, the second antenna port is the antenna port corresponding to the second reference signal resource, and the P2 antenna ports include the second antenna port. Alternatively, one mapping relationship in the mapping relationship group is used to indicate the mapping relationship between the antenna ports corresponding to the first reference signal resource and the antenna ports corresponding to the second reference signal resource in different frequency domain units or different time units. The first reference signal resource is one of the K1 reference signal resources associated with the first reference signal, and the second reference signal resource is one of the K1 reference signal resources associated with the second reference signal. In this way, the mapping relationship between the first reference signal resource (used for associating with the first reference signal) and the second reference signal resource (used for associating with the second reference signal) and the antenna ports can be associated, thereby effectively defining the port mapping relationship configuration when multiple reference signal resources are used to transmit a single reference signal, which helps the terminal perform channel measurements.

[0118] Optionally, the one-to-one correspondence between the K1 reference signal resources and the K1 mapping relationship groups may be indicated by the network-side device, agreed upon by the protocol, or be a default.

[0119] Optionally, the aforementioned K1 mapping relationship groups can be identical. In this case, the network-side device only needs to indicate one mapping relationship group, thereby helping to save on network-side indication overhead. In some implementations, a mapping relationship group can also be agreed upon by the protocol.

[0120] It should be noted that in some possible implementations, K2=1 and K1=K, that is, K mapping relationships do not need to be grouped, which helps to save the indication overhead of network-side devices.

[0121] Optionally, the first reference signal is associated with K reference signal resources, and the K reference signal resources correspond one-to-one with the K mapping relationships. Understandably, the antenna ports corresponding to the K reference signal resources are also the antenna ports corresponding to the first reference signal, or in other words, there is a correspondence between the K reference signal resources and the antenna ports of the first reference signal. This defines the mapping relationship between the antenna ports corresponding to the reference signal resources used to transmit the first reference signal and the antenna ports corresponding to the second reference signal, thereby helping to standardize the reference signal transmission behavior between the terminal and network-side equipment.

[0122] It should be noted that the reference signal corresponds to at least one reference signal resource. This can be understood as the reference signal being transmitted on the at least one reference signal resource, or as the terminal receiving the reference signal on the at least one reference signal resource, or as the ports of the at least one reference signal resource constituting the ports of the reference signal, or as the reference signal being configured as the at least one reference signal resource.

[0123] Optionally, the mapping relationship is indicated by at least one of the following:

[0124] Bitmap;

[0125] First-dimensional interval and second-dimensional interval;

[0126] The index of the starting port.

[0127] For example, the network-side device sends an indication message to the terminal, which indicates the mapping relationship. The indication message includes at least one of the following: a bitmap, a first-dimensional interval, a second-dimensional interval, and an index of the starting port. This makes the indication method of the mapping relationship by the network-side device more flexible.

[0128] For example, the mapping relationship can be indicated by bitmaps. For instance, a network-side device can indicate K bitmaps, with each bitmap indicating one mapping relationship, meaning there is a one-to-one correspondence between the K bitmaps and the K mapping relationships. The specific implementation of indicating the mapping relationship using bitmaps can be found in the description of subsequent embodiments, and will not be repeated here.

[0129] Alternatively, the mapping relationship can be indicated by a first-dimensional interval and a second-dimensional interval. The first dimension can refer to the horizontal or vertical dimension of the port array composed of P2 antenna ports, and the second dimension is either the vertical or horizontal dimension of the port array. The first-dimensional interval refers to the interval between two adjacent ports of P1 antenna ports in the first dimension of the port array, and the second-dimensional interval refers to the interval between two adjacent ports of P1 antenna ports in the second dimension of the port array. For example, the network-side device can indicate K first-dimensional intervals and K second-dimensional intervals, where one first-dimensional interval and one second-dimensional interval indicate one mapping relationship, and the K first-dimensional intervals and K second-dimensional intervals correspond one-to-one with K mapping relationships. The specific implementation of indicating the mapping relationship using first-dimensional intervals and second-dimensional intervals can be found in the description of subsequent embodiments, and will not be repeated here.

[0130] Alternatively, the mapping relationship can be indicated by a first-dimensional interval, a second-dimensional interval, and a starting port index. For example, the network-side device indicates the first-dimensional interval, the second-dimensional interval, and K indices. Each frequency domain unit or time unit associated with the first reference signal corresponds to an index. The mapping relationship between the antenna port of the first reference signal transmitted in the frequency domain unit or time unit corresponding to the index and P2 antenna ports can be determined through the first-dimensional interval, the second-dimensional interval, and the index. The specific implementation of indicating the mapping relationship through the first-dimensional interval, the second-dimensional interval, and the index can be referred to the description in the subsequent embodiments, and will not be repeated here.

[0131] Optionally, when the mapping relationship is indicated by a bitmap, one bit in the bitmap corresponds to one of the P2 antenna ports; or,

[0132] One bit in the bitmap corresponds to one antenna port set, and the antenna port set includes the antenna ports among the P2 antenna ports.

[0133] For example, the bitmap includes P2 bits, and each of the P2 bits corresponds one-to-one with one of the P2 antenna ports. Of course, the number of bits included in the bitmap can be greater than P2 or less than P2. Different bits in the bitmap can correspond to different antenna ports, or at least one bit in the bitmap can correspond to the same antenna port.

[0134] For example, one bit in a bitmap can correspond to a set of antenna ports, which can be N antenna ports out of P2 antenna ports, where N < P2 and N > 1.

[0135] In this way, it is possible to indicate one antenna port out of P2 antenna ports, or multiple antenna ports out of P2 antenna ports, through the bits in the bitmap (that is, one bit corresponds to one set of antenna ports), thus making the indication of the mapping relationship more flexible.

[0136] In this embodiment of the application, the method further includes:

[0137] The terminal acquires a first set and determines the K mapping relationships based on the first set;

[0138] The first set includes the K mapping relationships.

[0139] Optionally, the first set may be sent to the terminal by the network-side device, or it may be predefined by the protocol or preconfigured. For example, the network-side device may preconfigure a set of mapping relationships (i.e., the first set), which includes the K mapping relationships. The network-side device sends the first set to the terminal, so that the terminal can obtain the K mapping relationships from the first set.

[0140] In this embodiment of the application, by pre-configuring or pre-defining the K mapping relationships in a set, the K mapping relationships can be flexibly configured with less indication overhead.

[0141] Optionally, the terminal acquires a first set and determines the K mapping relationships based on the first set, including:

[0142] The terminal acquires a first set and a first indication information, and determines the K mapping relationships from the first set based on the first indication information.

[0143] In some possible implementations, the first indication information may be used to indicate an index or identifier.

[0144] For example, the first indication information indicates K indices, which may be indices of mapping relationships included in the first set. Thus, based on the K indices, the terminal can determine the K mapping relationships from the first set.

[0145] Alternatively, the first indication information indicates K identifiers, which may be identifiers of mapping relationships included in the first set. Thus, based on the K identifiers, the terminal can determine the K mapping relationships from the first set.

[0146] In some possible implementations, the first indication information is used to indicate a mapping relationship in the first set, an antenna port index, or an antenna port index offset.

[0147] For example, the first indication information indicates a mapping relationship and K antenna port indices. The terminal can determine the K mapping relationships based on the mapping relationship and the K antenna port indices. The specific determination method can be referred to the description in the subsequent embodiments, and will not be repeated here.

[0148] For example, the first indication information indicates a mapping relationship and K antenna port index offsets. The terminal can determine the K mapping relationships based on the mapping relationship and the K antenna port index offsets. The specific determination method can be referred to the description in the subsequent embodiments, and will not be repeated here.

[0149] Optionally, the first indication information may indicate a mapping relationship from the first set using a combination number, or it may indicate a mapping relationship from the first set by indicating an index or identifier.

[0150] This method allows the terminal to determine the K mapping relationships more flexibly.

[0151] Optionally, the method further includes:

[0152] The terminal determines the correspondence between the frequency domain unit associated with the first reference signal and the K mapping relationships based on any of the following:

[0153] The index of the frequency domain cell associated with the first reference signal;

[0154] The index order of the frequency domain units associated with the first reference signal, wherein the frequency domain units are all the frequency domain units associated with the first reference signal configured by the network-side device;

[0155] The index order of the frequency domain cells associated with the first reference signal in any of the N1 discontinuous frequency domain resources configured by the network-side device;

[0156] The index of the frequency domain unit group, which is composed of frequency domain units associated with the first reference signal, wherein the frequency domain units are all frequency domain units associated with the first reference signal configured by the network-side device;

[0157] The index order of frequency domain unit groups, wherein the frequency domain unit groups are composed of frequency domain units associated with the first reference signal, and the frequency domain units are all frequency domain units associated with the first reference signal configured by the network-side device; the index order of frequency domain unit groups in any of the N2 non-contiguous frequency domain resources configured by the network side, wherein the frequency domain unit groups are composed of frequency domain units associated with the first reference signal;

[0158] Where N1 and N2 are both positive integers.

[0159] For example, in some implementations, among all frequency domain units associated with the first reference signal configured by the network-side device, K corresponding mapping relationships are determined according to the index of the frequency domain unit. For example, for a frequency domain unit with index f, it corresponds to the mod(f+f0, K)+1th mapping relationship, where f0 is a constant agreed upon by the protocol or configured by the base station.

[0160] For example, in some implementations, among all the frequency domain units associated with the first reference signal configured on the network-side device, these frequency domain units are sorted by index, so that the terminal can determine the correspondence between the frequency domain units and K mapping relationships based on the index order of the frequency domain units. For example, each of the K frequency domain units corresponds one-to-one with the K mapping relationships, and the correspondence can be indicated by the network-side device, or it can be agreed upon by protocol or determined according to certain rules, such as the configuration order of the mapping relationships.

[0161] In some implementations, the network-side device can configure N1 non-contiguous frequency domain resources for the terminal to transmit the first reference signal. Each frequency domain resource includes a frequency domain unit for transmitting the first reference signal. In any given frequency domain resource, after sorting the frequency domain units associated with the first reference signal by index, every K frequency domain units correspond one-to-one with the K mapping relationships. The mapping relationships can be indicated by the network-side device, or agreed upon by protocol, or determined according to certain rules, such as the configuration order of the mapping relationships.

[0162] In some implementations, all frequency domain units associated with the first reference signal can be grouped, for example, into groups of Q frequency domain units (Q≥K), resulting in multiple frequency domain unit groups. These frequency domain unit groups are then sorted by index, and each K frequency domain unit group corresponds one-to-one with the K mapping relationships. These mapping relationships can be indicated by the network-side device, agreed upon by a protocol, or determined according to certain rules, such as the configuration order of the mapping relationships. It should be understood that when a frequency domain unit group corresponds to a mapping relationship, it can be understood that all frequency domain units within the frequency domain unit group correspond to the mapping relationship.

[0163] In some implementations, the network-side device can configure N² non-contiguous frequency domain resources for the terminal to transmit the first reference signal. Each frequency domain resource includes frequency domain units associated with the first reference signal, and the frequency domain units included in each frequency domain resource are grouped, thus obtaining multiple frequency domain unit groups within a single frequency domain resource. Within a frequency domain resource, after sorting the frequency domain unit groups according to their indices, every K frequency domain unit groups correspond one-to-one with the K mapping relationships. These mapping relationships can be indicated by the network-side device, agreed upon by protocol, or determined according to certain rules, such as the configuration order of the mapping relationships.

[0164] In some implementations, the frequency domain units associated with the first reference signal configured by the network-side equipment can be grouped, for example, into groups of Q frequency domain units (Q≥K), resulting in multiple frequency domain unit groups. The corresponding mapping relationship can be determined according to the index of the frequency domain unit group. For example, for the frequency domain unit group with index q, it corresponds to the mod(q+q0,K)+1th mapping relationship, where q0 is a constant agreed upon by the protocol or configured by the base station.

[0165] In this embodiment, the terminal can determine the mapping relationship between the frequency domain units associated with the first reference signal and the K mapping relationships based on the above-described method. This helps the terminal determine the mapping relationship between the antenna ports of the first reference signal and the antenna ports of the second reference signal in different frequency domain units. It should be noted that the frequency domain units can be the frequency domain units corresponding to all the reference signal resources associated with the first reference signal, or the frequency domain unit corresponding to one of the reference signal resources, with the remaining frequency domain units corresponding to the reference signal resources determined in a similar manner as described above. The frequency domain units corresponding to the reference signal resources can be understood as the frequency domain units occupied by the reference signal resources. Optionally, the method further includes:

[0166] The terminal determines the correspondence between the time unit associated with the first reference signal and the K mapping relationships based on the following:

[0167] The index of the time unit associated with the first reference signal;

[0168] The index order of the time units associated with the first reference signal.

[0169] For example, in some implementations, K mapping relationships are determined according to the index of the time unit associated with the first reference signal. For instance, for a frequency domain unit with index t, it corresponds to the mod(t+t0, K)+1th mapping relationship, where t0 is a constant agreed upon by the protocol or configured by the base station.

[0170] For example, in some implementations, among all time units associated with the first reference signal, these time units are sorted by index, so that the terminal can determine the correspondence between the time units and K mapping relationships based on the index order of the time units. For example, each of the K time units corresponds one-to-one with the K mapping relationships, and the correspondence can be indicated by the network-side device, or it can be agreed upon by protocol or determined according to certain rules, such as the configuration order of the mapping relationships.

[0171] It should be noted that the time unit associated with the first reference signal can be understood as the time unit used to transmit the first reference signal, or the time unit used to receive the first reference signal, or the time unit occupied by the first reference signal, or the frequency domain unit occupied by the reference signal resource associated with the first reference signal.

[0172] In this embodiment of the application, the terminal can determine the correspondence between the time unit associated with the first reference signal and the K mapping relationships based on the above method, which helps the terminal determine the mapping relationship between the port corresponding to the first reference signal in different time units and the port of the second reference signal.

[0173] It should be noted that the time unit can be the time unit corresponding to all the reference signal resources corresponding to the first reference signal, or the time unit corresponding to one of the reference signal resources, and the time units corresponding to the remaining reference signal resources can be determined in a similar manner as described above. Here, the time unit corresponding to a reference signal resource can be understood as the time unit occupied by the reference signal resource.

[0174] The terminal determines the correspondence between the frequency domain unit and time unit associated with the first reference signal of the network-side device and the K mapping relationships based on at least one of the following:

[0175] The index of the time unit associated with the first reference signal;

[0176] The index order of the time units associated with the first reference signal;

[0177] The index of the frequency domain unit associated with the first reference signal, wherein the frequency domain unit is all the frequency domain units associated with the first reference signal configured by the network-side device;

[0178] The index order of the frequency domain units associated with the first reference signal, wherein the frequency domain units are all the frequency domain units associated with the first reference signal configured by the network-side device;

[0179] The index order of the frequency domain cells associated with the first reference signal in any of the N1 discontinuous frequency domain resources configured by the network-side device;

[0180] The index of the frequency domain unit group, which is composed of frequency domain units associated with the first reference signal, wherein the frequency domain units are all frequency domain units associated with the first reference signal configured by the network-side device;

[0181] The index order of the frequency domain unit group, wherein the frequency domain unit group is composed of frequency domain units associated with the first reference signal, and the frequency domain units are all frequency domain units associated with the first reference signal configured by the network side device;

[0182] Among the N2 discontinuous frequency domain resources configured on the network side, the index order of the frequency domain unit group in any frequency domain resource, wherein the frequency domain unit group is composed of the frequency domain units associated with the first reference signal.

[0183] Optionally, the method further includes:

[0184] The terminal determines the frequency domain unit associated with the first reference signal based on at least one of the following:

[0185] The first interval is the interval between frequency domain units associated with the first reference signal (e.g., frequency domain interval), and the frequency domain units associated with the first reference signal are evenly distributed; wherein, the first interval can be indicated by the network-side device, and the first interval can be the number of frequency domain units between two adjacent frequency domain units (i.e., the frequency domain units associated with the first reference signal).

[0186] The second interval is the interval between adjacent frequency domain unit groups (e.g., frequency domain interval), one frequency domain unit group includes M frequency domain units, the frequency domain units are the frequency domain units associated with the first reference signal, the interval between two adjacent frequency domain unit groups is the same, and M is a positive integer.

[0187] Optionally, M is an integer multiple of K. In some cases, M = K. The interval between two adjacent frequency domain cell groups (i.e., the second interval) can be indicated by the network-side device, for example, the network-side device can indicate the frequency domain density.

[0188] The specific implementation of the terminal determining the frequency domain unit associated with the first reference signal based on the first interval or the second interval can be found in the description in the subsequent embodiments, and will not be repeated here.

[0189] In this embodiment of the application, the terminal can also determine the frequency domain unit associated with the first reference signal based on the first interval or the second interval, which helps the terminal to perform measurements on the corresponding frequency domain unit.

[0190] To better understand the technical solutions provided in this application, the following specific embodiments are used to explain and illustrate the technical solutions provided in this application. It should be noted that the following embodiments are mainly illustrated using the correspondence between mapping relationships and frequency domain units as an example. It should be understood that the configuration and determination methods of mapping relationships in the following embodiments can also be applied to the case where mapping relationships correspond to time units, and will not be repeated here.

[0191] Example 1:

[0192] In this embodiment, the network-side device (hereinafter, the base station is used as an example for explanation) can indicate K bitmaps. Each frequency domain unit that transmits the first reference signal is associated with a bitmap, and a bitmap can determine a mapping relationship.

[0193] 1-1. Optionally, each bit in the bitmap corresponds to one of the P2 antenna ports (e.g., a set of all antenna ports for a base station). When a bit in the bitmap is a first value (e.g., the first value can be 1), the port corresponding to that bit (i.e., the port in this application is also the antenna port, which will not be described further) is included in the subset of ports corresponding to the first reference signal transmitted on the frequency domain unit (corresponding to the bitmap), or in other words, one port of the frequency domain unit corresponding to the first reference signal will be mapped to one of the P2 ports (e.g., a set of all ports) corresponding to the bitmap. For example, as shown in Figure 4a, each square in the figure represents a port, and the number in the square represents the index of the bit corresponding to that port. According to the bitmap in the figure, the filled ports (ports 0, 3, 4, 7) will be the subset of ports corresponding to the first reference signal transmitted on the frequency domain unit associated with the bitmap, or in other words, the filled ports will be mapped to the four ports corresponding to the first reference signal transmitted on the frequency domain unit.

[0194] Optionally, the correspondence between the bits of the index from smallest to largest and the ports can be arranged in the order of the second dimension first, then the first dimension, and finally the polarization direction. Here, the first dimension is the horizontal direction of the array, and the second dimension is the vertical direction of the array; or, the first dimension can be the vertical direction of the array, and the second dimension can be the horizontal direction of the array.

[0195] Optionally, the index of the port in the full port set corresponding to the port of the first reference signal transmitted on the frequency domain unit associated with the bitmap, whose index is i = 0, ..., P1-1, can be determined by the following formula (5): p i =P+f(i+1) (5)

[0196] Where P1 is the number of ports of the first reference signal transmitted on the frequency domain unit associated with the bitmap, which is also equal to the number of bits in the bitmap that take the first value. f(i) represents the bit number or index of the i-th bit in the bitmap that takes the first value. For example, for the bitmap b3b2b1b0 = 1100, considering the first value as 1, then f(1) = 2, f(2) = 3. P can be configured by the base station, or agreed upon by the protocol or by default, for example, P = 3000. Further, optionally, the index i is determined by the following formula (6):

[0197] Where s represents the index of the Orthogonal Cover Code (OCC) sequence used by the antenna port, j is the index of the Code Division Multiplexing (CDM) group, and L represents the size of the CDM group used by the reference signal resource. In some other possible embodiments, the antenna port p used by the first reference signal transmitted on the frequency domain unit associated with the bitmap can be indexed by the following formula (7):

[0198] Where s represents the index of the OCC sequence used by the antenna port, j is the index of the Code Division Multiplexing (CDM) group, and L represents the size of the CDM group used by the CSI-RS. P can be configured by the base station, or agreed upon by the protocol, or defaulted, for example, P = 3000. f(i) represents the bit number or index of the i-th bit in the bitmap that has the first value.

[0199] 1-2. Optionally, each bit in the Bitmap corresponds to a port set in the full port set. For example, the port set can be a pair of dual-polarized ports, or several ports that are adjacent in position. Figures 4b(a) to (e) show some possible port set patterns. The port set can be agreed upon by the protocol or indicated by the base station. When a bit in the Bitmap is a first value, it indicates that all or part of the ports in the port set corresponding to that bit are in the port set corresponding to the first reference signal transmitted on the frequency domain unit (associated with the bitmap), or at least one of the ports mapped to the first reference signal transmitted on the frequency domain unit (associated with the bitmap). The part of the ports can be indicated by the base station, or it can be determined by the protocol or rules. For example, it can be the port with the smallest port index in the port set and the port with the other polarization direction corresponding to it.

[0200] Optionally, the port set corresponds to an array, which includes a first dimension N. sub1 One port, second dimension N sub2 2N ports in total sub1 N sub2There are 2 ports (where 2 represents two polarization directions). When the bit corresponding to the port set is the first value, it means that the port with the smallest port index in the port set and the port with the other polarization direction corresponding to it will be mapped to at least one of the ports corresponding to the first reference signal transmitted on the frequency domain unit (associated with the bitmap) in the port subset, or in other words, mapped to at least one of the ports corresponding to the first reference signal transmitted on the frequency domain unit (associated with the bitmap). Further, the index of the port in the full port set corresponding to the port with the index of the first reference signal transmitted on the frequency domain unit associated with the bitmap being i = 0, ..., P1-1 can be determined by the following formula (8):

[0201] Where P1 is the number of ports transmitting the first reference signal on the frequency domain unit associated with the bitmap. N1 and N2 are the number of ports in the first and second dimensions of the array corresponding to P2 antenna ports (e.g., the full port set), respectively. f(i) represents the bit number or index of the i-th bit in the bitmap that has the first value. P can be configured by the base station, or agreed upon by the protocol, or by default, for example, P = 3000. If N... sub2 If it is divisible by N2, then in the above formula... It can be replaced with N2 / N sub2 Further, optionally, the index i can be determined by the above formula (7). In other possible embodiments, the antenna port p used by the first reference signal transmitted on the frequency domain unit associated with the bitmap can be indexed by the following formula (9):

[0202] Where s represents the index of the code division OCC sequence used by the antenna port, j is the index of the CDM group, and L represents the size of the CDM group used by the reference signal resource. P and f(i) can be found in the previous description.

[0203] Optionally, in (8) and (9), N2 can be replaced with N1, N sub1 Can be with N sub2 exchange.

[0204] 1-3. Optionally, among all frequency domain units for transmitting the first reference signal configured by the base station, after sorting by index, every K frequency domain units are in one-to-one correspondence with the K bitmaps. The correspondence may be configured by the base station, or may be specified by a protocol or determined according to a certain rule, for example, determined according to the configuration sequence of the bitmaps, where the (k+1)-th bitmap corresponds to the (k+1)-th one of the K adjacent frequency domain units for transmitting the first reference signal, and k=0,..., K-1. Exemplarily, as shown in FIG. 4c, where K=3. It should be noted that the frequency domain units for transmitting the first reference signal in the figure are continuously distributed in the frequency domain, but in some embodiments, a plurality of frequency domain units may be spaced between two adjacent frequency domain units for transmitting the first reference signal, and further, the intervals between different two adjacent frequency domain units for transmitting the first reference signal may also be different.

[0205] If the number of all frequency domain units for transmitting the first reference signal configured by the base station is not an integer multiple of K, the bitmap corresponding to the remaining K2 frequency domain units (K2<K) may be indicated by the base station, or may be specified by a protocol or determined according to a certain rule, for example, may be determined using the aforementioned rule.

[0206] In some implementations, the number of frequency domain units for transmitting the first reference signal must be a multiple of K.

[0207] 1-4. Optionally, the base station may configure a plurality of frequency domain resources that are discontinuous in the frequency domain for the terminal to transmit the first reference signal. In each frequency domain resource, after all frequency domain units for transmitting the first reference signal are sorted by index, every K frequency domain units are in one-to-one correspondence with the K bitmaps. The correspondence may be configured by the base station, or may be specified by a protocol or determined according to a certain rule, for example, determined according to the configuration sequence of the bitmaps, where the (k+1)-th bitmap corresponds to the (k+1)-th one of the K adjacent frequency domain units for transmitting the first reference signal, k=0,..., K-1, which may refer to the related description above. Exemplarily, as shown in FIG. 4d, it should be noted that the frequency domain units for transmitting the first reference signal in the figure are continuously distributed in the frequency domain, but in some embodiments, a plurality of frequency domain units may be spaced between two adjacent frequency domain units for transmitting the first reference signal, and further, the intervals between different two adjacent frequency domain units for transmitting the first reference signal may also be different. It should be noted that if the correspondence is performed in the manner in 1-3, the 3 frequency domain units of the second frequency domain resource in the figure correspond to bitmap#2, bitmap#1, and bitmap#0 respectively.

[0208] Embodiment 2:

[0209] In this embodiment, the base station may indicate K first-dimension intervals Δm kK second-dimensional intervals Δn k k = 0, ..., K-1. Each frequency domain unit transmitting the first reference signal is associated with a pair of Δm k and Δn k Correlation. Δm k and Δn k A subset of ports corresponding to the first reference signal transmitted on a frequency domain unit associated with it, or a mapping relationship between the ports corresponding to the first reference signal transmitted on a frequency domain unit associated with it and the ports among the P2 antenna ports is determined.

[0210] 2-1. Optionally, corresponding to Δm k and Δn k The port index of the full port corresponding to the port with index i = 0, ..., P1-1 of the first reference signal transmitted on a certain frequency domain unit can be determined by the following formula (10):

[0211] Where N1 and N2 are the number of ports in the first and second dimensions of the full port set, respectively. P1 is the number of ports in the port subset, and for example, P1 can be determined by the following formula: Where Δm is limited k If it is divisible, then in the formula Round up to the nearest integer to remove it. Similarly, if Δn is limited... k If it is divisible, then in the formula Round up to the nearest integer. P is a constant, which can be configured by the base station, or agreed upon by the protocol or by default, for example, P = 3000. k It can be configured by the base station for different Δm k and Δn k Different Ps can be configured k Or it may be agreed upon or defaulted to by a protocol, such as P k =0. Optionally, index i can be determined by the above formula (7). In other possible embodiments, with Δm k and Δn k The antenna port p used by the first reference signal transmitted on the associated frequency domain unit can be indexed and numbered according to the following formula (11):

[0212] Where s represents the index of the code division OCC sequence used by the antenna port, j is the index of the CDM group, and L represents the size of the CDM group used by the reference signal resource. It should be noted that in some other embodiments, formula (10) or (11) can be replaced as follows: N2 is replaced by N1, Δn k Replace the position with Δm k , Δm k Replace the position with Δnk In some possible embodiments, (10) It can be replaced by taking its remainder relative to N1N2. Similarly, in (11) It can be replaced by taking the remainder relative to N1N2.

[0213] Optionally, Δm is limited. k If N1 is divisible, then in (10) or (11) above... It can be simplified to N2 / Δn k .

[0214] It should be noted that, in this embodiment, the minimum value of the first-dimensional interval or the second-dimensional interval is 1, meaning that the first-dimensional interval or the second-dimensional interval between two adjacent ports in the first or second dimension is 1. It should be understood that if the minimum value is 0, then only Δm described above needs to be... k and Δn k Replace with Δm k +1 and Δn k +1.

[0215] 2-2. Optionally, after sorting all frequency domain units configured by the base station that transmit the first reference signal by index, each K frequency domain unit is paired with the K pairs of Δm. k and Δn k A one-to-one correspondence exists, and this correspondence can be configured by the base station, or determined by a protocol or certain rules, such as based on Δm. k and Δn k The configuration order is determined, the (k+1)th pair of Δm k and Δn k This corresponds to the (k+1)th frequency domain unit among the K adjacent frequency domain units transmitting the first reference signal, where k = 0, ..., K-1. Other relevant descriptions can be found in the description of Embodiment 1 above, and will not be repeated here.

[0216] 2-3. Optionally, the base station can configure multiple discontinuous frequency domain resources for the terminal to transmit the first reference signal. In each frequency domain resource, after all frequency domain units transmitting the first reference signal are sorted by index, every K frequency domain units are paired with the K pairs of Δm. k and Δn k A one-to-one correspondence exists, and this correspondence can be configured by the base station, or determined by a protocol or certain rules, such as based on Δm. k and Δn k The configuration order is determined, the (k+1)th pair of Δm k and Δn kThis corresponds to the (k+1)th frequency domain unit among the K adjacent frequency domain units transmitting the first reference signal, where k = 0, ..., K-1. Other relevant descriptions can be found in the description of Embodiment 1 above, and will not be repeated here.

[0217] Example 3:

[0218] In this embodiment, the base station can indicate the first dimension interval Δm, the second dimension interval Δn, and K indices Q. k (k = 0, ..., K-1). Each frequency domain element of the first transmitted reference signal is associated with one of the Q... k Corresponding. Q k Δm and Δn together determine a relationship with Q. k The port subset of the first reference signal transmitted on the associated frequency domain unit, or the determination of Q. k The mapping relationship between the port of the first reference signal transmitted on the associated frequency domain unit and the ports in the P2 antenna ports (e.g., the full port set), i.e., one of the K mapping relationships.

[0219] 3-1. Optionally, corresponding to Q k The port index of the full port corresponding to the port with index i = 0, ..., P1-1 of the first reference signal transmitted on a certain frequency domain unit can be determined by the following formula (12):

[0220] Where N1 and N2 are the number of ports in the first and second dimensions of the full port set, respectively. P1 is the number of ports in the port subset, and for example, P1 can be determined by the following formula: Where, if we restrict Δm to be divisible, then in this formula... Rounding up to the nearest integer removes the integer part. Similarly, if we restrict Δn to be divisible, then the formula... Round up to the nearest integer. Optionally, index i can be determined by formula (7) above. Q is a constant, indicated by the base station, or agreed upon by the protocol or by default, for example, Q = 3000 or 0. In other possible embodiments, Q... k The antenna port p used by the first reference signal transmitted on the associated frequency domain unit can be indexed and numbered by the following formula (13):

[0221] Where s represents the index of the code division OCC sequence used by the antenna port, j is the index of the CDM group, and L represents the size of the CDM group used by the reference signal resource. It should be noted that in some other embodiments, formula (12) or (13) can be replaced as follows: N2 is replaced by N1, Δn k Replace the position with Δm k , Δm kReplace the position with Δn k In some possible embodiments, (12) It can be replaced by the result of taking the remainder relative to N1N2. Similarly, in (13) It can be replaced by the result of taking the remainder relative to N1N2.

[0222] Optionally, if Δm is required to divide N1, then in (12) or (13) above... It can be simplified to N2 / Δn.

[0223] It should be noted that, in this embodiment, the minimum value of the first-dimensional interval or the second-dimensional interval is 1, meaning that the first-dimensional interval or the second-dimensional interval between two adjacent ports in the first or second dimension is 1. It should be understood that if the minimum value is 0, then only Δm described above needs to be... k and Δn k Replace with Δm k +1 and Δn k +1.

[0224] 3-2. Optionally, Q k This can be indicated in the following ways:

[0225] 1) Indicates or protocol default Q0, indicating the index deviation ΔQ relative to Q0. k (k=1,…,K-1), then Q k Q can be determined as follows: k =Q0+ΔQ k .

[0226] 2) Optionally, through the first index n 1,k Second index n 2,k To indicate, for example, Q can be determined by the following formula (14) or (15). k Q k =Q2+n 1,k N2+n 2,k (14)

[0227] Or, Q k =Q2+mod(n) 1,k ,Δm)N2+mod(n 2,k ,Δn) (15)

[0228] Q2 is a constant, indicated by the base station, or it can be agreed upon by the protocol or by default. For example, Q2 can be 3000 or 0.

[0229] 3) Optionally, the first dimension offset Δq1 and the second dimension offset Δq2, indicating Q0, can be determined, for example, by the following formula (16) or (17). k k = 0, ..., K-1: Q k =Q0+kΔq2N2+kΔq1 (16)

[0230] Or, Q k =Q0+mod(kΔq2,Δm)N2+mod(kΔq1,Δn) (17)

[0231] In some possible embodiments, Q0 can be indicated by indicating a first index and a second index, and then determined by (14) or (15). In some embodiments, Q0 can be agreed upon by a protocol or by default. Optionally, the base station also needs to indicate the value of K.

[0232] 4) Optional, Q k Some of these are agreed upon or defaulted to by the protocol; for example, Q0 may be agreed upon or defaulted to by the protocol.

[0233] It should be noted that for different k, Q k The correspondence between the frequency domain unit that transmits the first reference signal and the frequency domain unit is similar to that described in the previous embodiment 2.

[0234] Example 4:

[0235] In this embodiment, the base station can pre-configure or pre-define a subset of ports or a set of mapping relationships.

[0236] Optionally, the base station indicates K port subsets or mapping relationships, where each port subset or mapping relationship belongs to the aforementioned set pre-configured by the base station or pre-defined by the protocol. Each frequency domain unit transmitting the first reference signal corresponds to one of the aforementioned K port subsets or mapping relationships. The specific correspondence is described similarly to that described in Embodiment 1 above.

[0237] Optionally, the base station may indicate one from the set of mappings, and then indicate any of the following:

[0238] 1) Indicate K indices T k (k = 0, ..., K-1), each T k The mapping relationship can determine one mapping relationship, and a total of K mapping relationships can be determined. For example, assume that the indicated mapping relationship corresponds to P2 antenna ports {Port1, Port2, ..., Port...} P1}, then T kThe corresponding P2 antenna ports are {Port1+T} k Port2+T k Port P1 +T k}

[0239] 2) Indicates or protocol default T0, indicating the offset ΔT relative to T0. k (k=1,…,K-1),T0 and ΔT k It can be determined that T k For example, T k =T0+ΔT k (k = 1, ..., K-1), and then a mapping relationship can be determined with the above mapping relationship. A total of K mapping relationships can be determined. The method for determining the mapping relationship can be referred to the relevant description in the previous embodiments.

[0240] Example 5:

[0241] This embodiment mainly describes how to determine the frequency domain unit associated with the first reference signal on the frequency domain resources configured by the base station and associated with the first reference signal.

[0242] In some embodiments, frequency domain units (i.e., frequency domain units associated with the first reference signal) for transmitting the first reference signal are uniformly distributed on the frequency domain resources configured by the base station for transmitting the first reference signal. The frequency domain spacing (e.g., the number of frequency domain units between two adjacent frequency domain units for transmitting the first reference signal) can be indicated by the base station, for example, the base station can indicate the frequency domain density. Optionally, the spacing between frequency domain units can be 0, that is, two adjacent frequency domain units for transmitting the first reference signal are adjacent to each other in the frequency domain. These frequency domain units will correspond to K port subsets or port mapping relationships. The configuration of the K port subsets or port mapping relationships and the corresponding description of the relationships can be found in the relevant descriptions in the previous embodiments. Figure 4e shows an example, where each square corresponds to a frequency domain unit. The filled squares represent frequency domain units for transmitting the first reference signal, the frequency domain density is configured to be 0.5 (that is, the frequency domain spacing between frequency domain units for transmitting the first reference signal is 1 frequency domain unit), and two mapping relationships are configured, with the frequency domain units for transmitting the first reference signal corresponding to the above two mapping relationships in sequence.

[0243] In some embodiments, on the frequency domain resources configured by the base station for transmitting the first reference signal, the frequency domain units for transmitting the first reference signal are grouped into K2 consecutive frequency domain units, with the same frequency domain spacing between adjacent groups. Here, K2 is an integer multiple of K and can be indicated by the base station, where K is the number of port subsets or port mapping relationships indicated by the base station. Optionally, K2 = K. The frequency domain spacing between adjacent groups (e.g., the number of frequency domain units in the spacing) can be indicated by the base station, for example, the base station can indicate the frequency domain density. These frequency domain units will correspond to the aforementioned K port subsets or mapping relationships. The configuration of the K port subsets or mapping relationships and the corresponding descriptions can be found in the relevant descriptions in the preceding embodiments. Figure 4f shows an example where K2 = K, and two port subsets are configured. Each square in Figure 4f corresponds to one frequency domain unit. The filled squares represent the frequency domain units that transmit the first reference signal, and the frequency domain density is configured to be 0.5 (that is, the interval between the frequency domain units that transmit the first reference signal is K frequency domain units). The frequency domain units that transmit the first signal correspond to the above two port subsets in sequence.

[0244] Through this embodiment, the terminal can determine the frequency domain unit that transmits the first reference signal, and then perform measurements on the corresponding frequency domain unit.

[0245] Example 6:

[0246] In this embodiment, both the second reference signal and the first reference signal are carried through K1 reference signal resources. The base station can then indicate or agree upon K1 sets of port mapping relationships, each set containing K3 port mapping relationships, where K1*K3 = K. Each set of port mapping relationships indicates the mapping relationship between a corresponding port in one of the K1 reference signal resources used to transmit the first reference signal and a corresponding port in one of the K1 reference signal resources used to transmit the second reference signal in different frequency domain units. It should be noted that all ports of the K1 reference signal resources used to transmit the second reference signal constitute P1 ports of the first reference signal, and there is a mapping relationship between them and P2 ports. Since all ports of the K1 reference signal resources used to transmit the first reference signal constitute the ports of the first reference signal, the port mapping relationship can also be considered to implicitly indicate the mapping relationship between the P1 ports and P2 ports of the first reference signal in different frequency domain units.

[0247] Optionally, the aforementioned K1 group of port mapping relationships can be identical. In this case, the base station only needs to indicate or agree upon one group of port mapping relationships. Further, the one-to-one mapping relationship between the K1 reference signal resources used to transmit the first reference signal and the K1 reference signal resources used to transmit the second reference signal can be indicated by the base station, agreed upon by the protocol, or defaulted. The configuration method for the port mapping relationship and its mapping relationship with the frequency domain unit can be found in the aforementioned Embodiment 1. For each reference signal resource used to transmit the first reference signal, the method for determining the frequency domain unit used to transmit the first reference signal can be found in Embodiment 5.

[0248] Optionally, in some possible embodiments, K3=1, K1=K, in which case the K port mapping relationships indicated by the base station do not need to be grouped.

[0249] This embodiment provides a method for configuring port mapping relationships when transmitting a single reference signal using multiple reference signal resources. This allows the terminal to perform channel measurements with low pilot overhead based on the above configuration.

[0250] Example 7:

[0251] In this embodiment, the first reference signal is transmitted through K reference signal resources. The ports of the K reference signal resources constitute the ports of the first reference signal, or in other words, there is a mapping relationship between them. For example, a reference signal resource set (e.g., NZP-CSI-RS-ResourceSet) can be configured, containing K reference signal resources. Then, the base station configures a reporting configuration, which is associated with the reference signal resource set. The mapping relationship between the K reference signal resources and the K ports is one-to-one. It can be understood that one of the K port mapping relationships determines the mapping relationship between the port corresponding to one of the K reference signal resources and P2 ports. The corresponding method can be base station configuration, protocol agreement, or certain rule determination, such as determining it according to the configuration method. For example, the kth configured reference signal resource corresponds to the kth configured port mapping relationship.

[0252] Optionally, the K reference signal resources are configured with the same frequency domain density but with different frequency domain offsets.

[0253] Optionally, the K reference signal resources have the same number of ports. Figure 4g provides a simple example, where one square corresponds to a frequency domain cell, and a filled square indicates that a reference signal is being transmitted on that frequency domain cell. The figure shows two reference signal resources, corresponding to two mapping relationships, with each reference signal resource having a frequency domain density of 0.25. The configuration method for the port mapping relationships can be found in Examples 1-4.

[0254] This embodiment provides a method for configuring port mapping relationships when transmitting a single reference signal using multiple reference signal resources. This allows the terminal to perform channel measurements with low pilot overhead based on the above configuration.

[0255] It should be noted that the specific mathematical expressions given in the above embodiments are only for example and other equivalent implementations are possible. For example, when a parameter defaults to 0, it may not appear in the corresponding expression. This application does not limit this.

[0256] Please refer to Figure 5, which is a flowchart of another configuration information sending method provided in an embodiment of this application. The method is applied to a network-side device. As shown in Figure 5, the method includes the following steps:

[0257] Step 501: The network-side device sends the first configuration information and the second configuration information to the terminal.

[0258] Wherein, the first configuration information is used to configure a first reference signal corresponding to P1 antenna ports and a second reference signal corresponding to P2 antenna ports, where P2 > P1, and P1 and P2 are both positive integers. The first reference signal is associated with K mapping relationships, and the mapping relationship is the mapping relationship between the P1 antenna ports and the P2 antenna ports.

[0259] The second configuration information is used to indicate the configuration of the CSI reports corresponding to the P2 antenna ports.

[0260] Optionally, the first reference signal is associated with K mapping relationships, including at least one of the following:

[0261] The frequency domain unit associated with the first reference signal is associated with one of the K mapping relationships;

[0262] The time unit associated with the first reference signal is associated with one of the K mapping relationships.

[0263] Optionally, both the first reference signal and the second reference signal are associated with K1 reference signal resources;

[0264] The K mapping relationships are divided into K1 mapping relationship groups, and each mapping relationship group includes K2 mapping relationships. The K1 reference signal resources correspond one-to-one with the K1 mapping relationship groups, and K1 and K2 are both positive integers.

[0265] Wherein, the mapping relationship in the mapping relationship group is used to indicate the mapping between the first antenna port and the second antenna port, the first antenna port is the antenna port corresponding to the first reference signal resource in the frequency domain unit or time unit, the P1 antenna ports include the first antenna port, the second antenna port is the antenna port corresponding to the second reference signal resource, and the P2 antenna ports include the second antenna port;

[0266] The first reference signal resource is one of the K1 reference signal resources associated with the first reference signal, and the second reference signal resource is one of the K1 reference signal resources associated with the second reference signal.

[0267] Optionally, the first reference signal is associated with K reference signal resources, and the K reference signal resources correspond one-to-one with the K mapping relationships.

[0268] Optionally, the mapping relationship is indicated by at least one of the following:

[0269] Bitmap;

[0270] First-dimensional interval and second-dimensional interval;

[0271] The index of the starting port.

[0272] Optionally, when the mapping relationship is indicated by a bitmap, one bit in the bitmap corresponds to one of the P2 antenna ports; or,

[0273] One bit in the bitmap corresponds to one antenna port set, and the antenna port set includes the antenna ports among the P2 antenna ports.

[0274] Optionally, the method further includes:

[0275] The network-side device sends a first set and first indication information to the terminal, wherein the first indication information is used by the terminal to determine the K mapping relationships from the first set;

[0276] The first set includes the K mapping relationships.

[0277] The configuration information sending method for network-side devices provided in this application corresponds to the method for terminal-side devices described above. The relevant concepts and implementation processes involved in this application can be referred to the specific descriptions in the above embodiments, and will not be repeated in this embodiment.

[0278] In this embodiment, the network-side device sends a first reference signal with P1 antenna ports and a second reference signal with P2 antenna ports to the terminal. The terminal can then determine the Channel State Information (CSI) of the P2 antenna ports corresponding to the second reference signal based on either the first or second reference signal and send it to the network-side device. Here, P2 > P1. This allows the terminal to determine the CSI of the P2 antenna ports not only based on the second reference signal but also based on the first reference signal, which has fewer antenna ports, making the CSI determination method more flexible. Furthermore, the terminal can determine the channel state information of the P2 antenna ports corresponding to the second reference signal based on the low-overhead first reference signal, thereby helping to save power consumption of the network-side device and pilot overhead for channel measurement.

[0279] The channel state information determination method provided in this application can be executed by a channel state information determination device. This application uses the example of a channel state information determination device executing the method to illustrate the channel state information determination device provided in this application.

[0280] This application provides a channel state information determination device. As an example, the channel state information determination device can be a communication device or a component in a communication device, such as a chip. The communication device can be a terminal, a network-side device, or a server, etc. Exemplarily, the terminal can be, but is not limited to, the type of terminal 11 listed above, and the network-side device can be, but is not limited to, the type of network-side device 12 listed above. This application does not impose specific limitations.

[0281] The channel state information determination device includes a receiving module, a transmitting module, and a processing module. These modules can be implemented in software or hardware. When implemented in hardware, the processing module can be implemented by a processor. For example, the processor can include general-purpose processors, special-purpose processors, etc., such as central processing units (CPUs), microprocessors, digital signal processors (DSPs), artificial intelligence (AI) processors, graphics processing units (GPUs), application-specific integrated circuits (ASICs), network processors (NPs), field-programmable gate arrays (FPGAs), or other programmable logic devices, gate circuits, transistors, discrete hardware components, etc. The receiving and transmitting modules can be implemented by a communication interface, which can include one or more of the following: transceivers, pins, circuits, buses, radio frequency units, etc.

[0282] Specifically, referring to Figure 6, when the channel state information determination device is a terminal or a component within a terminal, the channel state information determination device 600 includes:

[0283] The first receiving module 601 is used to receive first configuration information sent by the network side device, and to receive a first reference signal corresponding to P1 antenna ports and a second reference signal corresponding to P2 antenna ports according to the first configuration information, where P2 > P1 and P1 and P2 are both positive integers. The first configuration information is used to configure the first reference signal and the second reference signal.

[0284] The second receiving module 602 is used to receive second configuration information, which is used to indicate the configuration of the CSI report corresponding to the P2 antenna ports;

[0285] The first transmitting module 603 is used to determine the CSI of the P2 antenna ports according to the first reference signal or the second reference signal, and to report the CSI according to the second configuration information;

[0286] The first reference signal is associated with K mapping relationships, which are the mapping relationships between the P1 antenna ports and the P2 antenna ports.

[0287] Optionally, the first reference signal is associated with K mapping relationships, including at least one of the following:

[0288] The frequency domain unit associated with the first reference signal is associated with one of the K mapping relationships;

[0289] The time unit associated with the first reference signal is associated with one of the K mapping relationships.

[0290] Optionally, both the first reference signal and the second reference signal are associated with K1 reference signal resources;

[0291] The K mapping relationships are divided into K1 mapping relationship groups, and each mapping relationship group includes K2 mapping relationships. The K1 reference signal resources correspond one-to-one with the K1 mapping relationship groups, and K1 and K2 are both positive integers.

[0292] Wherein, the mapping relationship in the mapping relationship group is used to indicate the mapping between the first antenna port and the second antenna port, the first antenna port is the antenna port corresponding to the first reference signal resource in the frequency domain unit or time unit, the P1 antenna ports include the first antenna port, the second antenna port is the antenna port corresponding to the second reference signal resource, and the P2 antenna ports include the second antenna port;

[0293] The first reference signal resource is one of the K1 reference signal resources associated with the first reference signal, and the second reference signal resource is one of the K1 reference signal resources associated with the second reference signal.

[0294] Optionally, the first reference signal is associated with K reference signal resources, and the K reference signal resources correspond one-to-one with the K mapping relationships.

[0295] Optionally, the mapping relationship is indicated by at least one of the following:

[0296] Bitmap;

[0297] First-dimensional interval and second-dimensional interval;

[0298] The index of the starting port.

[0299] Optionally, when the mapping relationship is indicated by a bitmap, one bit in the bitmap corresponds to one of the P2 antenna ports; or,

[0300] One bit in the bitmap corresponds to one antenna port set, and the antenna port set includes the antenna ports among the P2 antenna ports.

[0301] Optionally, the device further includes:

[0302] An acquisition module is used to acquire a first set and first indication information, and determine the K mapping relationships from the first set based on the first indication information;

[0303] The first set includes the K mapping relationships.

[0304] Optionally, the device further includes:

[0305] The first determining module is configured to determine the correspondence between the frequency domain unit associated with the first reference signal and the K mapping relationships based on any one of the following:

[0306] The index of the frequency domain cell associated with the first reference signal;

[0307] The index order of the frequency domain units associated with the first reference signal, wherein the frequency domain units are all the frequency domain units associated with the first reference signal configured by the network-side device;

[0308] The index order of the frequency domain cells associated with the first reference signal in any of the N1 discontinuous frequency domain resources configured by the network-side device;

[0309] The index of the frequency domain unit group, which is composed of frequency domain units associated with the first reference signal, wherein the frequency domain units are all frequency domain units associated with the first reference signal configured by the network-side device;

[0310] The index order of the frequency domain unit group, wherein the frequency domain unit group is composed of frequency domain units associated with the first reference signal, and the frequency domain units are all frequency domain units associated with the first reference signal configured by the network side device;

[0311] Among the N2 discontinuous frequency domain resources configured on the network side, the index order of the frequency domain unit group in any frequency domain resource, wherein the frequency domain unit group is composed of the frequency domain units associated with the first reference signal;

[0312] Where N1 and N2 are both positive integers.

[0313] Optionally, the device further includes:

[0314] The second determining module is configured to determine the frequency domain unit associated with the first reference signal based on at least one of the following:

[0315] The first interval is the interval between the frequency domain units associated with the first reference signal, and the frequency domain units associated with the first reference signal are evenly distributed.

[0316] The second interval is the interval between adjacent frequency domain unit groups. One frequency domain unit group includes M frequency domain units, which are frequency domain units associated with the first reference signal. The interval between two adjacent frequency domain unit groups is the same, and M is a positive integer.

[0317] Optionally, M is an integer multiple of K.

[0318] Optionally, the device further includes:

[0319] The second determining module is used to determine the correspondence between the time unit associated with the first reference signal and the K mapping relationships based on any one of the following:

[0320] The index of the time unit associated with the first reference signal;

[0321] The index order of the time units associated with the first reference signal.

[0322] The channel state information determination device 600 provided in this application embodiment can implement the various processes implemented in the method embodiment of FIG3 and achieve the same technical effect. To avoid repetition, it will not be described again here.

[0323] Referring to Figure 7, when the configuration information sending device is a network-side device or a component within a network-side device, the configuration information sending device 700 includes:

[0324] The second sending module 701 is used to send the first configuration information and the second configuration information to the terminal.

[0325] Wherein, the first configuration information is used to configure a first reference signal corresponding to P1 antenna ports and a second reference signal corresponding to P2 antenna ports, where P2 > P1, and P1 and P2 are both positive integers. The first reference signal is associated with K mapping relationships, and the mapping relationship is the mapping relationship between the P1 antenna ports and the P2 antenna ports.

[0326] The second configuration information is used to indicate the configuration of the CSI reports corresponding to the P2 antenna ports.

[0327] Optionally, the first reference signal is associated with K mapping relationships, including at least one of the following:

[0328] The frequency domain unit associated with the first reference signal is associated with one of the K mapping relationships;

[0329] The time unit associated with the first reference signal is associated with one of the K mapping relationships.

[0330] Optionally, both the first reference signal and the second reference signal are associated with K1 reference signal resources;

[0331] The K mapping relationships are divided into K1 mapping relationship groups, and each mapping relationship group includes K2 mapping relationships. The K1 reference signal resources correspond one-to-one with the K1 mapping relationship groups, and K1 and K2 are both positive integers.

[0332] Wherein, the mapping relationship in the mapping relationship group is used to indicate the mapping between the first antenna port and the second antenna port, the first antenna port is the antenna port corresponding to the first reference signal resource in the frequency domain unit or time unit, the P1 antenna ports include the first antenna port, the second antenna port is the antenna port corresponding to the second reference signal resource, and the P2 antenna ports include the second antenna port;

[0333] The first reference signal resource is one of the K1 reference signal resources associated with the first reference signal, and the second reference signal resource is one of the K1 reference signal resources associated with the second reference signal.

[0334] Optionally, the first reference signal is associated with K reference signal resources, and the K reference signal resources correspond one-to-one with the K mapping relationships.

[0335] Optionally, the mapping relationship is indicated by at least one of the following:

[0336] Bitmap;

[0337] First-dimensional interval and second-dimensional interval;

[0338] The index of the starting port.

[0339] Optionally, when the mapping relationship is indicated by a bitmap, one bit in the bitmap corresponds to one of the P2 antenna ports; or,

[0340] One bit in the bitmap corresponds to one antenna port set, and the antenna port set includes the antenna ports among the P2 antenna ports.

[0341] Optionally, the second sending module 701 is further configured to:

[0342] Send a first set and a first indication information to the terminal, wherein the first indication information is used by the terminal to determine the K mapping relationships from the first set;

[0343] The first set includes the K mapping relationships.

[0344] The configuration information sending device 700 provided in this application embodiment can implement the various processes implemented in the method embodiment of FIG5 and achieve the same technical effect. To avoid repetition, it will not be described again here.

[0345] As shown in Figure 8, this application embodiment also provides a communication device 800, including a processor 801 and a memory 802. The memory 802 stores a program or instructions that can run on the processor 801. For example, when the communication device 800 is a terminal, the program or instructions executed by the processor 801 implement the various steps of the above-described channel state information determination method embodiment and achieve the same technical effect. When the communication device 800 is a network-side device, the program or instructions executed by the processor 801 implement the various steps of the above-described configuration information sending method embodiment and achieve the same technical effect. To avoid repetition, further details are omitted here.

[0346] This application also provides a terminal, including a processor and a communication interface, wherein the communication interface is coupled to the processor, and the processor is used to run programs or instructions to implement the steps in the method embodiment shown in FIG3. This terminal embodiment corresponds to the above-described terminal-side method embodiment, and all implementation processes and methods of the above-described method embodiments can be applied to this terminal embodiment and can achieve the same technical effect. The terminal may be the channel state information determination device shown in FIG6. Specifically, FIG9 is a schematic diagram of the hardware structure of a terminal implementing an embodiment of this application.

[0347] The terminal 900 includes, but is not limited to, at least some of the following components: radio frequency unit 901, network module 902, audio output unit 903, input unit 904, sensor 905, display unit 906, user input unit 907, interface unit 908, memory 909, and processor 910.

[0348] Those skilled in the art will understand that the terminal 900 may also include a power supply (such as a battery) for powering various components. The power supply can be logically connected to the processor 910 through a power management system, thereby enabling functions such as charging, discharging, and power consumption management through the power management system. The terminal structure shown in Figure 9 does not constitute a limitation on the terminal. The terminal may include more or fewer components than shown, or combine certain components, or have different component arrangements, which will not be elaborated here.

[0349] It should be understood that, in this embodiment, the input unit 904 may include a graphics processor 9041 and a microphone 9042. The graphics processor 9041 processes image data of still images or videos obtained by an image capture device (such as a camera) in video capture mode or image capture mode. The display unit 906 may include a display panel 9061, which may be configured in the form of a liquid crystal display, an organic light-emitting diode, or the like. The user input unit 907 includes at least one of a touch panel 9071 and other input devices 9072. The touch panel 9071 is also called a touch screen. The touch panel 9071 may include a touch detection device and a touch controller. Other input devices 9072 may include, but are not limited to, physical keyboards, function keys (such as volume control buttons, power buttons, etc.), trackballs, mice, and joysticks, which will not be described in detail here.

[0350] In this embodiment, after receiving downlink data from the network-side device, the radio frequency unit 901 can transmit it to the processor 910 for processing; in addition, the radio frequency unit 901 can send uplink data to the network-side device. Typically, the radio frequency unit 901 includes, but is not limited to, antennas, amplifiers, transceivers, couplers, low-noise amplifiers, duplexers, etc.

[0351] The memory 909 can be used to store software programs or instructions, as well as various data. The memory 909 may primarily include a first storage area for storing programs or instructions and a second storage area for storing data. The first storage area may store the operating system, application programs or instructions required for at least one function (such as sound playback, image playback, etc.). Furthermore, the memory 909 may include volatile memory or non-volatile memory. The non-volatile memory may be read-only memory (ROM), programmable read-only memory (PROM), erasable programmable read-only memory (EPROM), electrically erasable programmable read-only memory (EEPROM), or flash memory. Volatile memory can be random access memory (RAM), static random access memory (SRAM), dynamic random access memory (DRAM), synchronous dynamic random access memory (SDRAM), double data rate synchronous dynamic random access memory (DDRSDRAM), enhanced synchronous dynamic random access memory (ESDRAM), synchronous link dynamic random access memory (SLDRAM), and direct memory bus RAM (DRRAM). The memory 909 in the embodiments of this application includes, but is not limited to, these and any other suitable types of memory.

[0352] Processor 910 may include one or more processing units; optionally, processor 910 integrates an application processor and a modem processor, wherein the application processor mainly handles operations involving the operating system, user interface, and applications, and the modem processor mainly handles wireless communication signals, such as a baseband processor. It is understood that the aforementioned modem processor may also not be integrated into processor 910.

[0353] The radio frequency unit 901 is used for:

[0354] The system receives first configuration information sent by a network-side device, and receives a first reference signal corresponding to P1 antenna ports and a second reference signal corresponding to P2 antenna ports according to the first configuration information, where P2 > P1 and P1 and P2 are both positive integers. The first configuration information is used to configure the first reference signal and the second reference signal; and...

[0355] Receive second configuration information, which is used to indicate the configuration of the CSI reports corresponding to the P2 antenna ports;

[0356] The processor 910 is configured to determine the CSI of the P2 antenna ports based on the first reference signal or the second reference signal;

[0357] The radio frequency unit 901 is also used to report the CSI according to the second configuration information;

[0358] The first reference signal is associated with K mapping relationships, which are the mapping relationships between the P1 antenna ports and the P2 antenna ports.

[0359] In this embodiment, after receiving the first reference signal corresponding to P1 antenna ports and the second reference signal corresponding to P2 antenna ports, the terminal can determine the CSI of the P2 antenna ports corresponding to the second reference signal based on either the first or second reference signal and send it to the network-side device. Here, P2 > P1. This allows the terminal to determine the CSI of the P2 antenna ports not only based on the second reference signal but also based on the first reference signal, which has fewer antenna ports, making the CSI determination method more flexible. Furthermore, the terminal can determine the channel state information of the P2 antenna ports corresponding to the second reference signal based on the low-overhead first reference signal, which helps save energy consumption of the network-side device and pilot overhead for channel measurement.

[0360] It is understood that the implementation process of each implementation method mentioned in this embodiment can refer to the relevant description of the above-mentioned channel state information determination method embodiment and achieve the same or corresponding technical effects. To avoid repetition, it will not be described again here.

[0361] This application also provides a network-side device, including a processor and a communication interface. The communication interface is coupled to the processor, and the processor is used to run programs or instructions to implement the steps of the method embodiment shown in FIG5. This network-side device embodiment corresponds to the above-described network-side device method embodiment. All implementation processes and methods of the above-described method embodiments can be applied to this network-side device embodiment and can achieve the same technical effect.

[0362] Specifically, this application embodiment also provides a network-side device, which may be the configuration information transmitting device shown in FIG7. As shown in FIG10, the network-side device 1000 includes: an antenna 101, a radio frequency device 102, a baseband device 103, a processor 104, and a memory 105. The antenna 101 is connected to the radio frequency device 102. In the uplink direction, the radio frequency device 102 receives information through the antenna 101 and sends the received information to the baseband device 103 for processing. In the downlink direction, the baseband device 103 processes the information to be transmitted and sends it to the radio frequency device 102. The radio frequency device 102 processes the received information and transmits it through the antenna 101.

[0363] The method executed by the network-side device in the above embodiments can be implemented in the baseband device 103, which includes a baseband processor.

[0364] The baseband device 103 may include at least one baseband board, on which multiple chips are disposed, as shown in FIG10. One of the chips is, for example, a baseband processor, which is connected to the memory 105 via a bus interface to call the program or instructions in the memory 105 to execute the network-side device operation shown in the above method embodiment.

[0365] The network-side device may also include a network interface 106, such as a Common Public Radio Interface (CPRI).

[0366] The radio frequency device 102 is used to: send first configuration information and second configuration information to the terminal;

[0367] Wherein, the first configuration information is used to configure a first reference signal corresponding to P1 antenna ports and a second reference signal corresponding to P2 antenna ports, where P2 > P1, and P1 and P2 are both positive integers. The first reference signal is associated with K mapping relationships, and the mapping relationship is the mapping relationship between the P1 antenna ports and the P2 antenna ports.

[0368] The second configuration information is used to indicate the configuration of the CSI reports corresponding to the P2 antenna ports.

[0369] In addition, the network-side device 1000 of this application embodiment also includes: a program or instructions stored in the memory 105 and executable on the processor 104. The processor 104 calls the program or instructions in the memory 105 to execute the methods executed by each module shown in FIG7 and achieve the same technical effect. To avoid repetition, it will not be described in detail here.

[0370] This application also provides a readable storage medium storing a program or instructions. When the program or instructions are executed by a processor, they implement the various processes of the above-described channel state information determination method or configuration information transmission method embodiments and achieve the same technical effect. To avoid repetition, they will not be described again here.

[0371] The processor mentioned above is either the processor in the terminal described in the above embodiments or the processor in the network-side device. The readable storage medium includes computer-readable storage media, such as computer read-only memory (ROM), random access memory (RAM), magnetic disk, or optical disk. In some examples, the readable storage medium may be a non-transient readable storage medium.

[0372] This application embodiment also provides a chip, which includes a processor and a communication interface. The communication interface and the processor are coupled. The processor is used to run programs or instructions to implement the various processes of the above-described channel state information determination method or configuration information transmission method embodiments, and can achieve the same technical effect. To avoid repetition, it will not be described again here.

[0373] It should be understood that the chip mentioned in the embodiments of this application may also be referred to as a system-on-a-chip, system chip, chip system, or system-on-a-chip, etc.

[0374] This application also provides a computer program / program product, which is stored in a storage medium and executed by at least one processor to implement the various processes of the above-described channel state information determination method or configuration information transmission method embodiments, and can achieve the same technical effect. To avoid repetition, it will not be described again here.

[0375] This application also provides a wireless communication system, including: a terminal and a network-side device, wherein the terminal can be used to perform the steps of the channel state information determination method as described above, and the network-side device can be used to perform the steps of the configuration information transmission method as described above.

[0376] 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. Without further limitations, 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. Furthermore, it should be noted that the scope of the methods and apparatuses in the embodiments of this application is not limited to performing functions in the order shown or discussed, but may also include performing functions substantially simultaneously or in the reverse order, depending on the functions involved. For example, the described methods may be performed in a different order than described, and various steps may be added, omitted, or combined. Additionally, features described with reference to certain examples may be combined in other examples.

[0377] From 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 computer software products plus necessary general-purpose hardware platforms, and of course, they can also be implemented by hardware. The computer software product is stored in a storage medium (such as ROM, RAM, magnetic disk, optical disk, etc.), and the computer software product includes several instructions to cause the terminal or network-side device to execute the methods described in the various embodiments of this application.

[0378] The embodiments of this application have been described above with reference to the accompanying drawings. However, this application is not limited to the specific embodiments described above. The specific embodiments described above are merely illustrative and not restrictive. Those skilled in the art can make many other implementations under the guidance of this application without departing from the spirit and scope of the claims. All of these implementations are within the protection scope of this application.

Claims

1. A method for determining channel state information, comprising: The terminal receives first configuration information sent by the network-side device, and receives a first reference signal corresponding to P1 antenna ports and a second reference signal corresponding to P2 antenna ports according to the first configuration information, where P2 > P1 and P1 and P2 are both positive integers. The first configuration information is used to configure the first reference signal and the second reference signal. The terminal receives second configuration information, which is used to indicate the configuration of the Channel State Information (CSI) report corresponding to the P2 antenna ports; The terminal determines the CSI of the P2 antenna ports based on the first reference signal or the second reference signal, and reports the CSI based on the second configuration information; The first reference signal is associated with K mapping relationships, which are the mapping relationships between the P1 antenna ports and the P2 antenna ports.

2. The method according to claim 1, wherein, The first reference signal is associated with K mapping relationships, including at least one of the following: The frequency domain unit associated with the first reference signal is associated with one of the K mapping relationships; The time unit associated with the first reference signal is associated with one of the K mapping relationships.

3. The method according to claim 1 or 2, wherein, Both the first reference signal and the second reference signal are associated with K1 reference signal resources; The K mapping relationships are divided into K1 mapping relationship groups, and each mapping relationship group includes K2 mapping relationships. The K1 reference signal resources correspond one-to-one with the K1 mapping relationship groups, and K1 and K2 are both positive integers. Wherein, the mapping relationship in the mapping relationship group is used to indicate the mapping between the first antenna port and the second antenna port, the first antenna port is the antenna port corresponding to the first reference signal resource in the frequency domain unit or time unit, the P1 antenna ports include the first antenna port, the second antenna port is the antenna port corresponding to the second reference signal resource, and the P2 antenna ports include the second antenna port; The first reference signal resource is one of the K1 reference signal resources associated with the first reference signal, and the second reference signal resource is one of the K1 reference signal resources associated with the second reference signal.

4. The method according to claim 1, wherein, The first reference signal is associated with K reference signal resources, and the K reference signal resources correspond one-to-one with the K mapping relationships.

5. The method according to any one of claims 1-4, wherein, The mapping relationship is indicated by at least one of the following: Bitmap; First-dimensional interval and second-dimensional interval; The index of the starting port.

6. The method according to claim 5, wherein, When the mapping relationship is indicated by a bitmap, one bit in the bitmap corresponds to one of the P2 antenna ports; or, One bit in the bitmap corresponds to one antenna port set, and the antenna port set includes the antenna ports among the P2 antenna ports.

7. The method according to any one of claims 1-6, further comprising: The terminal acquires a first set and first indication information, and determines the K mapping relationships from the first set based on the first indication information; The first set includes the K mapping relationships.

8. The method according to any one of claims 1-7, further comprising: The terminal determines the correspondence between the frequency domain unit associated with the first reference signal and the K mapping relationships based on any of the following: The index of the frequency domain cell associated with the first reference signal; The index order of the frequency domain units associated with the first reference signal, wherein the frequency domain units are all the frequency domain units associated with the first reference signal configured by the network-side device; The index order of the frequency domain cells associated with the first reference signal in any of the N1 discontinuous frequency domain resources configured by the network-side device; The index of the frequency domain unit group, which is composed of frequency domain units associated with the first reference signal, wherein the frequency domain units are all frequency domain units associated with the first reference signal configured by the network-side device; The index order of the frequency domain unit group, wherein the frequency domain unit group is composed of frequency domain units associated with the first reference signal, and the frequency domain units are all frequency domain units associated with the first reference signal configured by the network side device; Among the N2 discontinuous frequency domain resources configured on the network side, the index order of the frequency domain unit group in any frequency domain resource, wherein the frequency domain unit group is composed of the frequency domain units associated with the first reference signal; Where N1 and N2 are both positive integers.

9. The method according to any one of claims 1-8, further comprising: The terminal determines the frequency domain unit associated with the first reference signal based on at least one of the following: The first interval is the interval between the frequency domain units associated with the first reference signal, and the frequency domain units associated with the first reference signal are evenly distributed. The second interval is the interval between adjacent frequency domain unit groups. One frequency domain unit group includes M frequency domain units, which are frequency domain units associated with the first reference signal. The interval between two adjacent frequency domain unit groups is the same, and M is a positive integer.

10. The method according to claim 9, wherein, M is an integer multiple of K.

11. The method according to any one of claims 1-10, further comprising: The terminal determines the correspondence between the time unit associated with the first reference signal and the K mapping relationships based on any one of the following: The index of the time unit associated with the first reference signal; The index order of the time units associated with the first reference signal.

12. A method for sending configuration information, comprising: The network-side device sends the first configuration information and the second configuration information to the terminal. Wherein, the first configuration information is used to configure a first reference signal corresponding to P1 antenna ports and a second reference signal corresponding to P2 antenna ports, where P2 > P1, and P1 and P2 are both positive integers. The first reference signal is associated with K mapping relationships, and the mapping relationship is the mapping relationship between the P1 antenna ports and the P2 antenna ports. The second configuration information is used to indicate the configuration of the CSI reports corresponding to the P2 antenna ports.

13. The method according to claim 12, wherein, The first reference signal is associated with K mapping relationships, including at least one of the following: The frequency domain unit associated with the first reference signal is associated with one of the K mapping relationships; The time unit associated with the first reference signal is associated with one of the K mapping relationships.

14. The method according to claim 12 or 13, wherein, Both the first reference signal and the second reference signal are associated with K1 reference signal resources; The K mapping relationships are divided into K1 mapping relationship groups, and each mapping relationship group includes K2 mapping relationships. The K1 reference signal resources correspond one-to-one with the K1 mapping relationship groups, and K1 and K2 are both positive integers. Wherein, the mapping relationship in the mapping relationship group is used to indicate the mapping between the first antenna port and the second antenna port, the first antenna port is the antenna port corresponding to the first reference signal resource in the frequency domain unit or time unit, the P1 antenna ports include the first antenna port, the second antenna port is the antenna port corresponding to the second reference signal resource, and the P2 antenna ports include the second antenna port; The first reference signal resource is one of the K1 reference signal resources associated with the first reference signal, and the second reference signal resource is one of the K1 reference signal resources associated with the second reference signal.

15. The method according to claim 12, wherein, The first reference signal is associated with K reference signal resources, and the K reference signal resources correspond one-to-one with the K mapping relationships.

16. The method according to any one of claims 12-15, wherein, The mapping relationship is indicated by at least one of the following: Bitmap; First-dimensional interval and second-dimensional interval; The index of the starting port.

17. The method according to claim 16, wherein, When the mapping relationship is indicated by a bitmap, one bit in the bitmap corresponds to one of the P2 antenna ports; or, One bit in the bitmap corresponds to one antenna port set, and the antenna port set includes the antenna ports among the P2 antenna ports.

18. The method according to any one of claims 12-17, further comprising: The network-side device sends a first set and first indication information to the terminal, wherein the first indication information is used by the terminal to determine the K mapping relationships from the first set; The first set includes the K mapping relationships.

19. A channel state information determination device, comprising: The first receiving module is used to receive first configuration information sent by the network-side device, and to receive a first reference signal corresponding to P1 antenna ports and a second reference signal corresponding to P2 antenna ports according to the first configuration information, where P2 > P1 and P1 and P2 are both positive integers. The first configuration information is used to configure the first reference signal and the second reference signal. The second receiving module is used to receive second configuration information, which is used to indicate the configuration of the CSI report corresponding to the P2 antenna ports; The first transmitting module is configured to determine the CSI of the P2 antenna ports based on the first reference signal or the second reference signal, and report the CSI based on the second configuration information. The first reference signal is associated with K mapping relationships, which are the mapping relationships between the P1 antenna ports and the P2 antenna ports.

20. The apparatus according to claim 19, wherein, Both the first reference signal and the second reference signal are associated with K1 reference signal resources; The K mapping relationships are divided into K1 mapping relationship groups, and each mapping relationship group includes K2 mapping relationships. The K1 reference signal resources correspond one-to-one with the K1 mapping relationship groups, and K1 and K2 are both positive integers. Wherein, the mapping relationship in the mapping relationship group is used to indicate the mapping between the first antenna port and the second antenna port, the first antenna port is the antenna port corresponding to the first reference signal resource in the frequency domain unit or time unit, the P1 antenna ports include the first antenna port, the second antenna port is the antenna port corresponding to the second reference signal resource, and the P2 antenna ports include the second antenna port; The first reference signal resource is one of the K1 reference signal resources associated with the first reference signal, and the second reference signal resource is one of the K1 reference signal resources associated with the second reference signal.

21. The apparatus according to claim 19 or 20, further comprising: An acquisition module is used to acquire a first set and first indication information, and determine the K mapping relationships from the first set based on the first indication information; The first set includes the K mapping relationships.

22. The apparatus according to any one of claims 19-21, further comprising: The first determining module is configured to determine the correspondence between the frequency domain unit associated with the first reference signal and the K mapping relationships based on any one of the following: The index of the frequency domain cell associated with the first reference signal; The index order of the frequency domain units associated with the first reference signal, wherein the frequency domain units are all the frequency domain units associated with the first reference signal configured by the network-side device; The index order of the frequency domain cells associated with the first reference signal in any of the N1 discontinuous frequency domain resources configured by the network-side device; The index of the frequency domain unit group, which is composed of frequency domain units associated with the first reference signal, wherein the frequency domain units are all frequency domain units associated with the first reference signal configured by the network-side device; The index order of the frequency domain unit group, wherein the frequency domain unit group is composed of frequency domain units associated with the first reference signal, and the frequency domain units are all frequency domain units associated with the first reference signal configured by the network side device; Among the N2 discontinuous frequency domain resources configured on the network side, the index order of the frequency domain unit group in any frequency domain resource, wherein the frequency domain unit group is composed of the frequency domain units associated with the first reference signal; Where N1 and N2 are both positive integers.

23. The apparatus according to any one of claims 19-22, further comprising: The second determining module is configured to determine the frequency domain unit associated with the first reference signal based on at least one of the following: The first interval is the interval between the frequency domain units associated with the first reference signal, and the frequency domain units associated with the first reference signal are evenly distributed. The second interval is the interval between adjacent frequency domain unit groups. One frequency domain unit group includes M frequency domain units, which are frequency domain units associated with the first reference signal. The interval between two adjacent frequency domain unit groups is the same, and M is a positive integer.

24. A configuration information transmitting device, comprising: The second sending module is used to send the first configuration information and the second configuration information to the terminal. Wherein, the first configuration information is used to configure a first reference signal corresponding to P1 antenna ports and a second reference signal corresponding to P2 antenna ports, where P2 > P1, and P1 and P2 are both positive integers. The first reference signal is associated with K mapping relationships, and the mapping relationship is the mapping relationship between the P1 antenna ports and the P2 antenna ports. The second configuration information is used to indicate the configuration of the CSI reports corresponding to the P2 antenna ports.

25. The apparatus according to claim 24, wherein, The first reference signal is associated with K mapping relationships, including at least one of the following: The frequency domain unit associated with the first reference signal is associated with one of the K mapping relationships; The time unit associated with the first reference signal is associated with one of the K mapping relationships.

26. The apparatus according to claim 24 or 25, wherein, Both the first reference signal and the second reference signal are associated with K1 reference signal resources; The K mapping relationships are divided into K1 mapping relationship groups, and each mapping relationship group includes K2 mapping relationships. The K1 reference signal resources correspond one-to-one with the K1 mapping relationship groups, and K1 and K2 are both positive integers. Wherein, the mapping relationship in the mapping relationship group is used to indicate the mapping between the first antenna port and the second antenna port, the first antenna port is the antenna port corresponding to the first reference signal resource in the frequency domain unit or time unit, the P1 antenna ports include the first antenna port, the second antenna port is the antenna port corresponding to the second reference signal resource, and the P2 antenna ports include the second antenna port; The first reference signal resource is one of the K1 reference signal resources associated with the first reference signal, and the second reference signal resource is one of the K1 reference signal resources associated with the second reference signal.

27. The apparatus according to any one of claims 24-26, wherein, The second sending module is also used for: A first set and a first indication information are sent to the terminal. The first indication information is used by the terminal to determine the K mapping relationships from the first set, wherein the first set includes the K mapping relationships.

28. A terminal comprising a processor and a memory, the memory storing a program or instructions executable on the processor, the program or instructions, when executed by the processor, implementing the steps of the channel state information determination method as described in any one of claims 1-11.

29. A network-side device, comprising a processor and a memory, the memory storing a program or instructions executable on the processor, the program or instructions, when executed by the processor, implementing the steps of the configuration information transmission method as described in any one of claims 12-18.

30. A readable storage medium storing a program or instructions that, when executed by a processor, implement the steps of the channel state information determination method as described in any one of claims 1-11, or the steps of the configuration information transmission method as described in any one of claims 12-18.

31. A computer program product stored in a storage medium, the computer program product being executed by at least one processor to implement the steps of the channel state information determination method as claimed in any one of claims 1-11, or to implement the steps of the configuration information transmission method as claimed in any one of claims 12-18.

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