Channel characteristic map determination method and device

Abstract

The invention discloses a channel characteristic map determination method and device, relates to the field of communication, and can determine a high-precision channel characteristic map. In the method, a terminal device and / or an access network device senses an environment based on sensing devices such as a radar, an infrared sensor, a camera, a point cloud laser scanner and the like and a communication pilot signal to sense material information of a scatterer and relative position information of the scatterer and the terminal device and / or the access network device; and the information is sent to the channel feature map management device through a first message, and the channel feature map management device determines a channel feature map according to the first message, so that a high-precision channel feature map is obtained.

Description

Technical Field

[0001] The present application relates to the field of communications, and in particular to a method and device for determining a channel characteristic map. Background Art

[0002] In the development from the fifth generation (5G) mobile communication system to the sixth generation (6G) mobile communication system, the contradiction between the surge in wireless channel dimensions and the limited pilot measurement resources has become increasingly serious, resulting in huge challenges for high-precision measurement of wireless channels. In order to solve the problem of limited pilot measurement resources in wireless communication systems, channel feature maps can be used to achieve channel measurement with low pilot overhead.

[0003] In the related technology, channel twin technology can be used to obtain a channel characteristic map. Specifically, the channel characteristic map can be obtained based on a deterministic channel modeling scheme. However, this method is highly dependent on the accuracy of environmental modeling. When the actual environment is relatively complex, the accuracy of the channel characteristic map obtained by this method is low. Summary of the invention

[0004] The present application provides a method and device for determining a channel characteristic map, which can determine a high-precision channel characteristic map.

[0005] In order to achieve the above objectives, the embodiments of the present application provide the following technical solutions:

[0006] In a first aspect, the present application provides a channel characteristic map determination method, which is applied to a channel characteristic map management device, the method comprising: the channel characteristic map management device receives a first message from an access network device, the first message includes first information, and the first message also includes at least one of second information and third information; the first information indicates the material or electromagnetic coefficient of the first scatterer, the second information indicates the relative position relationship between the first scatterer and the first terminal device; the third information indicates the relative position relationship between the first scatterer and the access network device; then the channel characteristic map management device determines the channel characteristic map according to the first message, the channel characteristic map including multiple grids at a geographical location and channel characteristic information corresponding to each of the multiple grids.

[0007] Optionally, the channel characteristic map can be understood as a database for storing channel characteristics based on geographic location, and the channel characteristics include at least one of channel statistical covariance matrix information, channel angle power spectrum information, channel power delay spectrum information, and channel path loss information. Optionally, the channel characteristic map can also store other information that characterizes the spatial domain, time domain, frequency domain, angle domain, Doppler domain, and delay domain characteristics of the channel, and the embodiments of the present application are not limited to this.

[0008] The second information or the third information can determine the position of the first scatterer to determine the channel characteristic map. The channel characteristic map can be as follows: Figure 4 As shown, the physical cell is divided into two-dimensional or three-dimensional grid points, and each grid stores the channel characteristics based on the geographical location. The material or electromagnetic coefficient of the first scatterer can improve the accuracy of electromagnetic calculation, thereby improving the accuracy of the channel characteristic map.

[0009] In a possible implementation, the method also includes: a channel characteristic map management device receives a first channel characteristic map request message from an access network device, the first channel characteristic map request message requests sending a channel characteristic map corresponding to a first terminal device or an access network device; the channel characteristic map management device sends a channel characteristic map response message to the access network device, the channel characteristic map response message includes a channel characteristic map corresponding to the first terminal device or the access network device.

[0010] For example, the channel characteristic map management device sends the channel characteristic map or the channel characteristic map grid index within the coverage of the access network device according to the first channel characteristic map request message; or sends the channel characteristic map or the channel characteristic map grid index within the coverage of other access network devices adjacent to the access network device; or sends the channel characteristic map or the channel characteristic map grid index corresponding to the grid where the first terminal device is located; or sends the channel characteristic map or the channel characteristic map grid index corresponding to the grid within a certain distance range of the first terminal device. In this way, the access network device can obtain the required high-precision channel characteristic map information and realize channel measurement with low pilot overhead.

[0011] In a possible implementation manner, the first message further includes profile information of the first scatterer.

[0012] Optionally, the profile information of the first scatterer can be represented by coordinates. When the first scatterer is a dynamic scatterer, the channel characteristic map management device can determine the area where the first scatterer changes dynamically based on the profile information of the first scatterer. In this way, the channel characteristic map management device can update the channel characteristic map of the dynamically changing area, further improve the accuracy of the channel characteristic map, and does not update all the channel characteristic maps, saving resources.

[0013] In a possible implementation, the first message further includes channel multipath information, and the channel multipath information includes at least one of multipath quantity information, multipath angle spread information, and multipath delay spread information.

[0014] Optionally, the channel characteristic map management device can determine the multipath complex area and the multipath simple area according to the channel multipath information, and construct or update the channel characteristic map using different methods for different areas, so as to obtain a high-precision channel characteristic map in a simple and efficient manner.

[0015] For example, for complex multipath areas, a full-wave simulation method with higher computational complexity is used to construct a channel characteristic map to obtain a high-precision channel characteristic map; for simple multipath areas, a ray tracing method with lower computational complexity is used to construct a channel characteristic map, which can also obtain a high-precision channel characteristic map and reduce the requirements for computing resources and time.

[0016] In a possible implementation, the first message also includes configuration information of the access network device, the configuration information of the access network device includes location information of the access network device and / or antenna information of the access network device, and the antenna information includes at least one of antenna height information, antenna size information, antenna type information, antenna downtilt angle information, antenna pattern information, and antenna main lobe direction information. In this way, the channel characteristic map management device can also determine the channel characteristic map according to the configuration information of the access network device, further improving the accuracy of the channel characteristic map.

[0017] In a possible implementation, the first message also includes at least one of a mobile identifier of the first scatterer, mobile speed information of the first scatterer, and mobile direction information of the first scatterer. In this way, the channel characteristic map management device can determine whether the first scatterer is moving according to the mobile identifier of the first scatterer, and determine information such as the mobile speed and mobile direction of the first scatterer, and determine the dynamically changing area of ​​the first scatterer according to this information. In this way, the channel characteristic map management device can update the channel characteristic map of the dynamically changing area, further improve the accuracy of the channel characteristic map, and does not update all the channel characteristic maps, saving resources.

[0018] In a possible implementation, the first message also includes a first channel measurement result; the first channel measurement result includes at least one of channel state information, channel statistical covariance matrix information, channel angle power spectrum information, channel power delay spectrum information, and channel path loss information.

[0019] Optionally, the first channel measurement result also includes other information characterizing the spatial domain, time domain, frequency domain, angle domain, Doppler domain, and delay domain characteristics of the channel, which is not limited in this embodiment of the present application.

[0020] In this way, the channel characteristic map management device can directly update the channel characteristic data of the corresponding grid according to the first channel measurement result, and can efficiently obtain a high-precision channel characteristic map.

[0021] In one possible implementation, before receiving the first message, it includes: sending a first request to the access network device, the first request instructing the access network device to send the first message; or, sending a second request to the first terminal device, the second request instructing the first terminal device to send a second message, the second message includes the first information and the second information.

[0022] Optionally, the channel characteristic map management device may send the first request within a certain time interval. Exemplarily, the first request is sent every hour. Optionally, when the multiple scatterers sensed by the channel characteristic map management device have not moved, the time interval for sending the first request may be extended, such as sending the first request once every 24 hours. When the multiple scatterers sensed by the channel characteristic map management device move, the time interval for sending the first request may be shortened, such as sending the first request once every 10 minutes. Alternatively, the second request may be sent every hour. Optionally, when the multiple scatterers sensed by the channel characteristic map management device have not moved, the time interval for sending the second request may be extended, such as sending the second request once every 24 hours. When the multiple scatterers sensed by the channel characteristic map management device move, the time interval for sending the second request may be shortened, such as sending the second request once every 10 minutes. In this way, the channel characteristic map can be updated in a timely manner while reducing the amount of data processed by the channel characteristic map management device.

[0023] In the second aspect, the present application provides a channel characteristic map construction method, which is applied to an access network device, and the method includes: sending a first message to a channel characteristic map management device, the first message includes first information, and the first message also includes at least one of second information and third information; the first information indicates the material or electromagnetic coefficient of the first scatterer, and the second information indicates the relative position relationship between the first scatterer and the first terminal device; the third information indicates the relative position relationship between the first scatterer and the access network device.

[0024] In a possible implementation manner, the method further includes: receiving a second message from the first terminal device, where the second message includes the first information and the second information.

[0025] In a possible implementation, the method also includes: sending a first channel characteristic map request message to a channel characteristic map management device, the first channel characteristic map request message requesting to send a channel characteristic map corresponding to a first terminal device or an access network device; receiving a first channel characteristic map response message from the channel characteristic map management device, the first channel characteristic map response message including a channel characteristic map corresponding to the first terminal device or the access network device.

[0026] In a possible implementation, the method also includes: receiving a second channel characteristic map request message from the first terminal device, the second channel characteristic map request message requesting to send a channel characteristic map corresponding to the first terminal device; sending a second channel characteristic map response message to the first terminal device, the second channel characteristic map response message including the channel characteristic map corresponding to the first terminal device.

[0027] In a possible implementation manner, the first message further includes fourth information, where the fourth information indicates a profile of the first scatterer.

[0028] In a possible implementation manner, the second message further includes fourth information, where the fourth information indicates a profile of the first scatterer.

[0029] In a possible implementation manner, the first message further includes channel multipath information, where the channel multipath information indicates at least one of multipath quantity information, angle spread information, and delay spread information.

[0030] In a possible implementation, the second message also includes channel multipath information of the location of the first terminal device, and the channel multipath information indicates at least one of multipath quantity information, angle spread information, and delay spread information.

[0031] In one possible implementation, the first message also includes access network device configuration information; the access network device configuration information includes at least one of access network device location information, access network device antenna height, access network device antenna size, access network device antenna type, access network device antenna downtilt angle, access network device antenna radiation pattern, and access network device antenna main lobe direction.

[0032] In a possible implementation manner, the first message further includes at least one of a first scatterer movement identifier, a first scatterer movement speed, and a first scatterer movement direction.

[0033] In a possible implementation manner, the second message further includes at least one of a first scatterer movement identifier, a first scatterer movement speed, and a first scatterer movement direction.

[0034] In a possible implementation, the first message also includes a first channel measurement result; the first channel measurement result includes at least one of channel state information, channel statistical covariance matrix information, channel angle power spectrum information, channel power delay spectrum information, and channel path loss information.

[0035] In a possible implementation manner, before sending the first message, the process includes:

[0036] A first request is received, where the first request instructs the access network device to send a first message.

[0037] In a third aspect, the present application provides a channel feature map construction method, which is applied to a first terminal device, the method comprising: sending a second message to an access network device, the second message comprising first information and second information; the first information indicates a material or electromagnetic coefficient of a first scatterer, and the second information indicates a relative position relationship between the first scatterer and the first terminal device;

[0038] In a possible implementation, the method also includes: sending a second channel characteristic map request message to the access network device, the second channel characteristic map request message requests sending a channel characteristic map corresponding to the first terminal device; receiving a channel characteristic map response message from the access network device, the channel characteristic map response message includes a channel characteristic map corresponding to the first terminal device.

[0039] In a possible implementation manner, the second message further includes fourth information, where the fourth information indicates a profile of the first scatterer.

[0040] In a possible implementation manner, the second message further includes channel multipath information, where the channel multipath information indicates at least one of multipath quantity information, angle spread information, and delay spread information.

[0041] In a possible implementation manner, the second message further includes at least one of a first scatterer movement identifier, a first scatterer movement speed, and a first scatterer movement direction.

[0042] In a fourth aspect, the present application provides a communication device, comprising a processor and an interface circuit, the interface circuit being used to receive signals from other communication devices and transmit them to the processor or to send signals from the processor to other communication devices, the processor being used to implement any of the methods described in any one of the first to third aspects above through logic circuits or execution code instructions.

[0043] In a fifth aspect, the present application provides a computer-readable storage medium, in which a computer program or instruction is stored. When the computer program or instruction is executed by a communication device, the method described in any one of the first to third aspects above is implemented.

[0044] In a sixth aspect, the present application provides a chip system comprising a processor and an input / output port, the processor being used to implement the channel characteristic map determination method of any of the above aspects, and the input / output port being used to implement the transceiver functions involved in the channel characteristic map determination method of any of the above aspects.

[0045] In one possible design, the chip system also includes a memory, which is used to store program instructions and data for implementing functions involved in the channel characteristic map determination method of any of the above aspects.

[0046] The chip system may be composed of chips, or may include chips and other discrete devices.

[0047] In a seventh aspect, a communication system is provided, which includes one or more terminal devices, one or more access network devices, and a channel characteristic map management device.

[0048] In an eighth aspect, a computer program product is provided, which includes a computer program or an instruction, and when the computer program or the instruction is executed on a computer, the computer executes the channel characteristic map determination method according to any of the above aspects.

[0049] The technical effects corresponding to the second to eighth aspects and any one of the implementation methods in the second to eighth aspects can be referred to the technical effects corresponding to any one of the implementation methods in the above-mentioned first aspect, and will not be repeated here. BRIEF DESCRIPTION OF THE DRAWINGS

[0050] Figure 1 It is a schematic diagram of a channel characteristic map determined in the related art.

[0051] Figure 2 It is a schematic diagram of a communication system provided in an embodiment of the present application.

[0052] Figure 3 It is a communication system interaction diagram provided in an embodiment of the present application.

[0053] Figure 4 It is a schematic diagram of a channel characteristic map provided in an embodiment of the present application.

[0054] Figure 5 It is a flow chart of a channel characteristic map determination method provided in an embodiment of the present application.

[0055] Figure 6 It is a coordinate schematic diagram provided in an embodiment of the present application.

[0056] Figure 7 This is another coordinate schematic diagram provided in an embodiment of the present application.

[0057] Figure 8 This is another channel characteristic map schematic diagram provided in an embodiment of the present application.

[0058] Fig. 9 This is a flow chart of another channel characteristic map determination method provided in an embodiment of the present application.

[0059] Fig.10 It is a structural diagram of a communication device provided in an embodiment of the present application.

[0060] Fig.11It is a structural diagram of another communication device provided in an embodiment of the present application. DETAILED DESCRIPTION

[0061] The terms "including" and "having" and any variations thereof mentioned in the description of the embodiments of the present application are intended to cover non-exclusive inclusions. For example, a process, method, system, product or device including a series of steps or units is not limited to the listed steps or units, but may optionally include other steps or units that are not listed, or may optionally include other steps or units that are inherent to these processes, methods, products or devices.

[0062] It should be noted that, in the embodiments of the present application, words such as "exemplary" or "for example" are used to indicate examples, illustrations or descriptions. Any embodiment or design described as "exemplary" or "for example" in the embodiments of the present application should not be interpreted as being more preferred or more advantageous than other embodiments or designs. Specifically, the use of words such as "exemplary" or "for example" is intended to present related concepts in a specific way.

[0063] In the description of the embodiments of the present application, unless otherwise specified, the meaning of "multiple" refers to two or more. The "and / or" in this article is only a description of the association relationship of the associated objects, indicating that there can be three relationships. For example, A and / or B can mean: A exists alone, A and B exist at the same time, and B exists alone.

[0064] In the embodiments of the present application, at least one can also be described as one or more, and multiple can be two, three, four or more, which is not limited in the present application.

[0065] In the embodiments of the present application, for a technical feature, the technical features in the technical feature are distinguished by "first", "second", "third", "A", "B", "C" and "D", and there is no order of precedence or size between the technical features described by the "first", "second", "third", "A", "B", "C" and "D".

[0066] Digital twin technology is crucial in the development process from 5G, 5G advanced to 6G. Digital twin technology is an important technology for depicting the physical world, simulating the physical world, optimizing the physical world, and visualizing the physical world in the virtual world. In the digital twin system, the physical world provides perception data for building the virtual world; the virtual world provides simulation data to guide the system design and algorithm optimization of the physical world.

[0067] For digital twin systems, the construction of channel twins is one of the core links. Channel twins are real, objective, and complete mappings of physical channel information in digital space, including geometric models and physical models. With the advent of the 6G mobile communication era, the system bandwidth has increased, the number of terminal device antennas has increased, and the network load has increased. The contradiction between the surge in wireless channel dimensions and the limited pilot measurement resources has become increasingly serious, resulting in huge challenges for high-precision measurement of wireless channels. In order to solve the problem of limited pilot measurement resources in wireless communication systems, channel feature maps can be used to achieve channel measurement with low pilot overhead.

[0068] In some embodiments, Figure 1 As shown, the measured data of some areas can be obtained by measuring the channel characteristics, and the interpolation data of other areas can be obtained according to the interpolation algorithm based on the measured data, so as to determine the channel characteristic map of the entire area. However, this method is difficult to measure data, and the accuracy of the channel characteristic map of some areas is low.

[0069] In other embodiments, a channel characteristic map may be obtained through channel twin technology. Specifically, a channel characteristic map may be constructed based on a deterministic channel modeling scheme of the map. Combined with a priori environmental maps, electromagnetic simulation calculations are used to simulate direct radiation, reflection, diffraction, transmission, and scattering of communication multipaths to obtain a deterministic channel model, and the channel characteristic map is determined based on the deterministic channel model.

[0070] However, this method is highly dependent on the accuracy of environmental modeling. The environmental modeling accuracy of existing commercial maps is often low, only at the meter level. The deterministic channel model is not accurate enough, and the channel feature map constructed based on the deterministic channel model has low accuracy. In addition, electromagnetic simulation calculations currently usually use ray tracing methods. When the actual environment is relatively complex, the deterministic channel model based on ray tracing is often not accurate enough, and the channel feature map constructed based on the deterministic channel model has low accuracy.

[0071] To solve the above technical problems, the embodiment of the present application provides a method for determining a channel characteristic map, in which the terminal device and / or access network device senses the environment based on sensing devices such as radar, infrared sensor, camera, point cloud laser scanner, and communication pilot signal, and senses the material of the scatterer, the relative position information between the scatterer and the terminal device and / or access network device, and other first messages, and sends the first message to the channel characteristic map management device, which determines the channel characteristic map (also called channel knowledge map, channel spectrum, channel map, etc.) according to the first message. Thus, a high-precision channel characteristic map is obtained.

[0072] Optionally, the scatterers described in the embodiments of the present application include objects that can directly irradiate, reflect, scatter, refract, or diffract signals, etc., and can affect the original propagation direction of the signals.

[0073] Figure 2 FIG. 1 is a schematic diagram of the architecture of a communication system 1000 used in an embodiment of the present application. Figure 2 As shown, the communication system includes a radio access network (RAN) 100, wherein the RAN 100 includes at least one RAN node (such as Figure 2 110a and 110b in the figure, collectively referred to as 110), and may also include at least one terminal (such as Figure 2 RAN 100 may also include other RAN nodes, such as wireless relay equipment and / or wireless backhaul equipment ( Figure 2 The terminal 120 is connected to the RAN node 110 in a wireless manner. Terminals and RAN nodes can be connected to each other by wire or wireless. The communication system 1000 may also include a core network 200. The RAN node 110 is connected to the core network 200 in a wireless or wired manner. The core network device in the core network 200 and the RAN node 110 in the RAN 100 may be independent and different physical devices, or may be the same physical device that integrates the logical functions of the core network device and the logical functions of the RAN node.

[0074] The embodiment of the present application also includes a channel feature map management device ( Figure 2 (not shown), the channel characteristic map management device can determine the channel characteristic map. The channel characteristic map management device can be located in a core network element or an access network device or other device, and the embodiment of the present application does not make specific restrictions on this.

[0075] RAN100 may be an evolved universal terrestrial radio access (E-UTRA) system, a new radio (NR) system, a future radio access system defined in the 3rd Generation Partnership Project (3GPP), or a WiFi system. RAN100 may also include two or more of the above different radio access systems. RAN100 may also be an open RAN (O-RAN).

[0076] RAN node, also known as access network equipment, RAN entity or access node, is used to help terminals access the communication system wirelessly. In one application scenario, the RAN node can be a base station (base stat ion), an evolved NodeB (eNodeB), a transmission reception point (TRP), a next-generation base station (next generation NodeB, gNB) in the fifth generation (5th generation, 5G) mobile communication system, a next-generation base station in the sixth generation (6th generation, 6G) mobile communication system, a base station in a future mobile communication system, or an access node in a WiFi system. RAN nodes can be macro base stations (such as Figure 2 110a), or a micro base station or an indoor station (such as Figure 2 110b) in the figure, it can also be a relay node or a host node.

[0077] In another application scenario, the cooperation of multiple RAN nodes can be used to help the terminal achieve wireless access, and different RAN nodes respectively implement part of the functions of the base station. For example, the RAN node can be a centralized unit (CU), a distributed unit (DU) or a radio unit (RU). The CU here completes the functions of the radio resource control protocol and the packet data convergence protocol (PDCP) of the base station, and can also complete the function of the service data adaptation protocol (SDAP); the DU completes the functions of the radio link control layer and the medium access control (MAC) layer of the base station, and can also complete the functions of part of the physical layer or all of the physical layer. For the specific description of the above-mentioned various protocol layers, please refer to the relevant technical specifications of 3GPP. RU can be used to implement the transceiver function of the radio frequency signal. CU and DU can be two independent RAN nodes, or they can be integrated in the same RAN node, for example, integrated in the baseband unit (BBU). The RU may be included in a radio frequency device, such as a remote radio unit (RRU) or an active antenna unit (AAU). The CU may be further divided into two types of RAN nodes: a CU-control plane and a CU-user plane.

[0078] In different systems, RAN nodes may have different names. For example, in an O-RAN system, CU may be called an open CU (open CU, O-CU), DU may be called an open DU (open DU, O-DU), and RU may be called an open RU (open RU, O-RU). The RAN node in the embodiment of the present application may be implemented by a software module, a hardware module, or a combination of a software module and a hardware module. For example, the RAN node may be a server loaded with a corresponding software module. The embodiments of the present application do not limit the specific technology and specific device form adopted by the RAN node. For the convenience of description, the following description takes a base station as an example of a RAN node.

[0079] A terminal is a device with wireless transceiver function, which can send signals to a base station or receive signals from a base station. A terminal can also be called a terminal device, user equipment (UE), a mobile station, a mobile terminal, etc. The terminal can be widely used in various scenarios, for example, device-to-device (D2D), vehicle-to-everything (V2X) communication, machine-type communication (MTC), Internet of Things (IOT), virtual reality, augmented reality, industrial control, automatic driving, telemedicine, smart grid, smart furniture, smart office, smart wear, smart transportation, smart city, etc. The terminal can be a mobile phone, a tablet computer, a computer with wireless transceiver function, a wearable device, a vehicle, an airplane, a ship, a robot, a mechanical arm, a smart home device, etc. The embodiments of the present application do not limit the specific technology and specific device form adopted by the terminal.

[0080] Base stations and terminals can be fixed or movable. Base stations and terminals can be deployed on land, including indoors or outdoors, handheld or vehicle-mounted; they can also be deployed on the water surface; they can also be deployed on airplanes, balloons, and artificial satellites. The embodiments of this application do not limit the application scenarios of base stations and terminals.

[0081] The roles of the base station and the terminal can be relative, for example, Figure 2The helicopter or drone 120i in the figure can be configured as a mobile base station. For the terminal 120j that accesses the wireless access network 100 through 120i, the terminal 120i is a base station; but for the base station 110a, 120i is a terminal, that is, 110a and 120i communicate through the wireless air interface protocol. Of course, 110a and 120i can also communicate through the interface protocol between base stations. In this case, relative to 110a, 120i is also a base station. Therefore, base stations and terminals can be collectively referred to as communication devices. Figure 2 110a and 110b in the figure may be referred to as communication devices having base station functions. Figure 2 120a-120j in the figure can be called communication devices with terminal functions.

[0082] Base stations and terminals, base stations and base stations, and terminals and terminals can communicate through authorized spectrum, unauthorized spectrum, or both; they can communicate through spectrum below 6 gigahertz (GHz), spectrum above 6 GHz, or spectrum below 6 GHz and spectrum above 6 GHz. The embodiments of the present application do not limit the spectrum resources used for wireless communication.

[0083] In the embodiments of the present application, the functions of the base station may also be performed by a module (such as a chip) in the base station, or by a control subsystem including the base station function. The control subsystem including the base station function here may be a control center in the above-mentioned application scenarios such as smart grid, industrial control, smart transportation, and smart city. The functions of the terminal may also be performed by a module (such as a chip or a modem) in the terminal, or by a device including the terminal function.

[0084] The technical solution provided in the embodiment of the present application can be applied to wireless communication between communication devices. Wireless communication between communication devices may include: wireless communication between core network elements and base stations, wireless communication between core network elements and terminals, wireless communication between base stations, wireless communication between base stations and terminals, and wireless communication between terminals. In the embodiment of the present application, the term "wireless communication" can also be referred to as "communication", and the term "communication" can also be described as "data transmission", "information transmission" or "transmission".

[0085] In the present application, the base station sends a downlink signal or downlink information to the terminal, and the downlink information is carried on a downlink channel; the terminal sends an uplink signal or uplink information to the base station, and the uplink information is carried on an uplink channel.

[0086] like Figure 3As shown, the terminal and the base station include a radio resource control (RRC) signaling interaction module (also referred to as an RRC entity), and information between the terminal and the base station can be transmitted via RRC signaling (RRC entity).

[0087] The terminal and the base station also include a medium access control (MAC) signaling interaction module (also called a MAC entity), and the terminal and the base station can transmit information via MAC control element (MAC control element) signaling (MAC entity).

[0088] The terminal and the base station also include a physical layer (PHY) signaling and data interaction module (also called a PHY entity). The terminal and the base station can interact through a physical downlink control channel (PDCCH), a physical downlink shared channel (PDSCH), a physical uplink control channel (PUCCH), and a physical uplink shared channel (PUSCH).

[0089] Optionally, the terminal or base station may further include other modules (or protocol entities) to implement the solution provided in the embodiment of the present application.

[0090] Optionally, the core network may include an access and mobility management function (AMF) entity, and the base station and the AMF communicate through the next generation core (NG-C) interface. The core network also includes a location management function (LMF) entity, which is used to estimate the location of the terminal and determine the channel feature map.

[0091] Alternatively, in another possible implementation, the core network further includes a map management function (MMF) entity, which can determine the channel characteristic map. The AMF and LMF / MMF communicate via an NLs interface.

[0092] Optionally, the channel characteristic map can be understood as a database for storing channel characteristics based on geographic location, wherein the channel characteristics include at least one of channel statistical covariance matrix information, channel angle power spectrum information, channel power delay spectrum information, and channel path loss information.

[0093] Optionally, the channel characteristic map may also store other information characterizing the spatial domain, time domain, frequency domain, angle domain, Doppler domain, and delay domain characteristics of the channel, which is not limited in the embodiments of the present application.

[0094] like Figure 4 An example of a channel characteristic map is shown. In the channel characteristic map, the physical cell can be divided into two-dimensional grid points, and each grid stores the channel characteristics of the location in the form of a matrix, vector, or scalar. Optionally, the physical cell can be divided into three-dimensional grid points, and each grid stores the channel characteristics of the location in the form of a matrix, vector, or scalar, which is not limited in the embodiments of the present application. It should be understood that the edge of each grid point is not necessarily a straight line, and grid areas of different shapes can also be divided according to different specific geographical locations.

[0095] Exemplarily, each grid in the channel characteristic map stores at least one of the channel statistical covariance matrix information, channel angle power spectrum information, channel power delay spectrum information, and channel path loss information of the corresponding geographical location area. The channel statistical covariance matrix information is represented in the form of a matrix, the channel angle power spectrum information and the channel power delay spectrum information are represented in the form of a vector, and the channel path loss information is represented in the form of a scalar.

[0096] Optionally, the channel characteristic map also corresponds to a channel characteristic map grid index.

[0097] Exemplarily, each grid point in the channel characteristic map corresponds to a number. Figure 4 As shown, the grid number of the first row and the first column is 1, and the grid stores the channel feature 1 of the corresponding position, the grid number of the first row and the second column is 2, and the grid stores the channel feature 2 of the corresponding position, ... The grid number of the ath row and the bth column is n, and the grid stores the channel feature n of the corresponding position, and so on. Each number corresponds to the channel feature in the grid. As shown in Table 1:

[0098] Table 1

[0099]

[0100]

[0101] For example, Figure 5The figure is a flow chart of the channel characteristic map determination method provided in the embodiment of the present application. The channel characteristic map determination method can be applied to Figure 2 The communication system shown.

[0102] like Figure 5 As shown, the channel characteristic map determination method includes the following steps:

[0103] S101. The channel characteristic map management apparatus sends a first request to an access network device, or sends a second request to a first terminal device.

[0104] The channel characteristic map management device may determine the channel characteristic map. Specifically, the channel characteristic map management device may construct the channel characteristic map, or may update the channel characteristic map in the original channel characteristic map.

[0105] In one embodiment, the channel characteristic map management device may be configured with a three-dimensional high-precision map, and the channel characteristic map management device determines the channel characteristic map based on the three-dimensional high-precision map.

[0106] Optionally, the channel characteristic map management device can be located in a core network element or in an access network device (or base station), and the embodiments of the present application do not impose specific restrictions on this.

[0107] Optionally, the channel characteristic map management apparatus may send a new radio positioning protocol annex (NRPPa) message carrying the first request to the access network device.

[0108] The first request may instruct the access network device to send a first message to the channel characteristic map management apparatus. The first message includes a plurality of information required to determine the channel characteristic map within the coverage of the access network device.

[0109] Optionally, the channel characteristic map management apparatus may carry the second request in an LTE positioning protocol (LPP) message sent to the first terminal device.

[0110] The second request may instruct the first terminal device to send a second message to the channel characteristic map management apparatus. The second message also includes a plurality of information required to determine the channel characteristic map within a certain area centered on the first terminal device.

[0111] In one embodiment, the embodiment of the present application may not include step S101 and directly execute step S102.

[0112] S102: The first terminal device sends a second message to the access network device according to the first request. Correspondingly, the access network device receives the second message from the first terminal device.

[0113] Optionally, the first terminal device may send a second message to the access network device via RRC, PUSCH, MAC-CE, PUCCH, etc.

[0114] Optionally, the first terminal device may send the second message within a certain time interval. Exemplarily, the second message is sent once every hour.

[0115] Optionally, when the multiple scatterers sensed by the first terminal device do not move, the time interval for sending the second message can be extended, such as sending the second message once every 24 hours. When the multiple scatterers sensed by the first terminal device move, the time interval for sending the second message can be shortened, such as sending the second message once every 10 minutes.

[0116] Optionally, when the density of terminal devices is relatively high, a terminal device is selected in a certain area and the second message is sent. Exemplarily, a terminal device may be selected in every 5 cubic meters to send the second message to the access network device.

[0117] Optionally, the second message may include first information and second information, wherein the first information may indicate the material or electromagnetic coefficient of the first scatterer.

[0118] Optionally, the material of the first scatterer may be concrete, glass, metal, plastic, vegetation, etc.

[0119] For example, when the material of the first scatterer is concrete, the first information may be 1; when the material of the first scatterer is glass, the first information may be 2; when the material of the first scatterer is metal, the first information may be 3; when the material of the first scatterer is plastic, the first information may be 4; when the material of the first scatterer is vegetation, the first information may be 5. It should be understood that the material of the first scatterer may also be indicated in other ways, for example, when the first scatterer is concrete, the first information may be a, indicating that the material of the first scatterer is concrete, and the embodiments of the present application do not impose specific limitations on this.

[0120] Optionally, the electromagnetic coefficient of the first scatterer may include parameters such as dielectric constant, conductivity, and reflectivity of the first scatterer.

[0121] For example, the first scatterer is concrete, the dielectric constant of the concrete is 6, the conductivity is 8 μS / cm, and the reflectivity is 50%. Then the first information may be "dielectric constant: 6+2i, conductivity: 8 μS / cm, reflectivity: 50%".

[0122] The second information may indicate a relative position relationship between the first scatterer and the first terminal device, wherein the relative position relationship between the first scatterer and the first terminal device may be represented by relative coordinates between the first scatterer and the first terminal device.

[0123] Optional, such as Figure 6 As shown, the first terminal device can establish a three-dimensional coordinate system (x1, y1, z1) with the first terminal device as a reference point to represent the relative position relationship between the first scatterer and the first terminal device. Optionally, the first terminal device can send the three-dimensional coordinate system to the access network device, and the access network device can subsequently establish a global three-dimensional coordinate system based on the three-dimensional coordinate systems of multiple terminal devices.

[0124] Exemplarily, the position of the first terminal device is (0, 0, 0), and the coordinates of the first scatterer are (1, 0, 0), which may indicate that the first scatterer is located 1 m in front of the first terminal device.

[0125] As another example, the position of the first terminal device is (0, 0, 0), and the coordinates of the second scatterer are (0, 1, 0), which can indicate that the second scatterer is located 1 meter to the right of the first terminal device.

[0126] Optionally, the first terminal device may also establish a three-dimensional coordinate system (x1, y1, z1) with the first scatterer as a reference point to indicate the relative position relationship between the first scatterer and the first terminal device. This embodiment of the application does not impose any specific limitation on this.

[0127] Optionally, the second message may further include fourth information, wherein the fourth information may indicate the profile of the first scatterer.

[0128] Optionally, the outline of the first scatterer may be the coordinates of each vertex of the first scatterer, wherein the coordinates are located in a three-dimensional coordinate system (x1, y1, z1) established with the first terminal device as a reference point.

[0129] For example, if the first scatterer is a rectangular office building, the outline of the office building can be represented by the coordinates of the eight vertices of the office building.

[0130] Optionally, the second message may further include channel multipath information of the location of the first terminal device, wherein the channel multipath information indicates at least one of multipath quantity information, multipath angle extension information, and multipath delay extension information.

[0131] Exemplarily, the multipath quantity information at the location of the first terminal device is 3, the multipath angle extension information is 25°, and the multipath delay extension information is 200ns.

[0132] Optionally, when the number of channel multipaths at the location of the first terminal device is greater than or equal to the multipath number threshold, or the angle extension information is greater than or equal to the angle threshold, or the multipath delay extension information is greater than or equal to the delay threshold, it can indicate that the first terminal device is in a complex multipath environment, otherwise it is in a simple multipath environment.

[0133] Exemplarily, the multipath quantity threshold may be 10, the multipath angle threshold may be 40°, and the multipath delay threshold may be 400ns, and the location of the first terminal device is a simple multipath environment.

[0134] For another example, the multipath quantity information of the location where the second terminal device is located is 3, the multipath angle extension information is 45°, and the multipath delay extension information is 200ns. Among them, the multipath angle extension information is greater than the multipath angle threshold. Then the location where the second terminal device is located is a multipath complex environment.

[0135] In one embodiment, the second message may also include a multipath complex environment indication identifier of the location of the first terminal device.

[0136] Exemplarily, when the first terminal device is located in a multipath complex environment, the multipath complex environment indication flag may be 1; when the first terminal device is located in a multipath simple environment, the multipath complex environment indication flag may be 0.

[0137] Optionally, the second message may further include at least one of a movement identifier of the first scatterer, a movement speed of the first scatterer, and a movement direction of the first scatterer.

[0138] The movement flag of the first scatterer indicates whether the first scatterer is moving. Exemplarily, when the first scatterer is in a moving state, the movement flag of the first scatterer may be 1; when the first scatterer is in a stationary state, the movement flag of the first scatterer may be 0.

[0139] The moving speed of the first scatterer represents the moving speed of the first scatterer. Exemplarily, the moving speed of the first scatterer is 10 m / s.

[0140] The moving direction of the first scatterer can be represented by the x-axis direction, the y-axis direction, and the z-axis direction in a three-dimensional coordinate system established with the first terminal device as the origin. Exemplarily, the moving direction of the first scatterer is the x-axis direction.

[0141] Optionally, the second message may be obtained by the first terminal device through sensing the environment based on sensing devices such as radar, infrared sensor, camera, point cloud laser scanner, and communication pilot signal.

[0142] S103: The access network device sends a first message to the channel characteristic map management apparatus. Correspondingly, the channel characteristic map management apparatus receives the first message from the access network device.

[0143] Optionally, the access network device may send the first message within a certain time interval. Exemplarily, the first message is sent once every hour.

[0144] Optionally, when the multiple scatterers sensed by the access network device do not move, the time interval for sending the first message can be extended, such as sending the first message once every 24 hours. When the multiple scatterers sensed by the access network device move, the time interval for sending the first message can be shortened, such as sending the first message once every 10 minutes.

[0145] In one embodiment, the access network device can transparently transmit the second message from the first terminal device to the channel feature map management device. That is, the first message is the second message from the first terminal device. The second message can be specifically described in the above step 102, which will not be repeated here.

[0146] In another embodiment, the access network device may process the second message from the first terminal device to obtain the first message, and send the first message to the channel characteristic map management device.

[0147] Optionally, the first message may include the first information, and the first message may also include at least one of the second information and the third information.

[0148] The first information may indicate the material or electromagnetic coefficient of the first scatterer, the second information may indicate the relative position relationship between the first scatterer and the first terminal device, and the third information may indicate the relative position relationship between the first scatterer and the access network device.

[0149] In one embodiment, the access network device may sense the relative position relationship between the first scatterer and the access network device.

[0150] Optionally, the access network device may establish a three-dimensional coordinate system (x1, y1, z1) with the access network device as a reference point to indicate the relative position relationship between the first scatterer and the access network device.

[0151] Exemplarily, the position of the access network device is (0, 0, 0), and the coordinates of the first scatterer are (1, 0, 0), which may indicate that the first scatterer is located 1 m in front of the access network device.

[0152] As another example, the position of the access network device is (0, 0, 0), and the coordinates of the second scatterer are (0, 1, 0), which can indicate that the second scatterer is located 1 m to the right of the access network device.

[0153] In another embodiment, the access network device may receive a plurality of second information from a plurality of terminal devices, and obtain the relative position relationship between the first scatterer and the access network device according to the plurality of second information.

[0154] There may be multiple terminal devices near the first scatterer, and each terminal device can sense the relative position relationship between the first scatterer and itself within a preset range. Therefore, when multiple terminal devices are close to each other, the first scatterer may be sensed by multiple terminal devices and sent to the access network device. The access network device can process the received multiple first scatterer coordinates to obtain a coordinate of the first scatterer relative to the access network device.

[0155] For example, Figure 7 As shown, the first terminal device establishes a three-dimensional coordinate system (x1, y1, z1) with the first terminal device as a reference point. The second information sent by the first terminal device includes the coordinates of the first terminal device as (0, 0, 0) and the coordinates of the first scatterer as (1, 0, 0).

[0156] The second terminal device establishes a three-dimensional coordinate system (x2, y2, z2) with the second terminal device as a reference point. The second information sent by the second terminal device includes the coordinates of the second terminal device as (0, 0, 0) and the coordinates of the first scatterer as (0, -1, 0).

[0157] Optionally, the access network device can receive the second information sent from the first terminal device and the second information sent from the second terminal device, and establish a three-dimensional coordinate system with the access network device as a reference point based on the second information sent from the first terminal device and the second information sent from the second terminal device to obtain the relative position relationship between the first scatterer and the access network device.

[0158] For example, Figure 7 As shown, a three-dimensional coordinate system (x3, y3, z3) is established with the second terminal device as a reference point, the coordinates of the access network device are (0, 0, 0), the coordinates of the first terminal device are (-2, -1, 0), and the coordinates of the second terminal device are (-1, 0, 0). According to the relative positional relationship between the first scatterer and the first terminal device and the relative positional relationship between the first scatterer and the second terminal device, the coordinates of the first scatterer relative to the access network device can be obtained as (-1, -1, 0).

[0159] Optionally, the first message may also include channel multipath information within the coverage of the access network device. The channel multipath information indicates at least one of multipath quantity information, angle spread information, and delay spread information. Within the coverage of the access network device, the channel multipath information at different locations may be different.

[0160] Specifically, the access network device may receive channel multipath information from the location of the first terminal device, and determine the channel multipath information within the coverage of the access network device according to the channel multipath information at the location of at least one terminal device.

[0161] Optionally, the access network device may also determine a multipath complex area within the coverage of the access network device according to multipath complex environment indications of locations of multiple terminal devices.

[0162] Exemplarily, if the access network device receives a multipath complex environment indication of the locations of the first terminal device, the second terminal device, the third terminal device, and the fourth terminal device. Among them, the locations of the first terminal device, the second terminal device, and the third terminal device are multipath complex environments, and the location of the fourth terminal device is a multipath simple environment. Then the area formed by the first terminal device, the second terminal device, and the third terminal device is a multipath complex area, and the other areas in the access network device coverage area are multipath simple areas.

[0163] Optionally, the first message may further include at least one of a moving identifier of the first scatterer, a moving speed of the first scatterer, and a moving direction of the first scatterer. The moving identifier of the first scatterer and the moving speed of the first scatterer may be specifically referred to the description in step S102, which will not be repeated here.

[0164] Optionally, the moving direction of the first scatterer may be represented by an x-axis direction, a y-axis direction, and a z-axis direction in a three-dimensional coordinate system established with the access network device as the origin.

[0165] Exemplarily, the movement flag of the first scatterer is 1, indicating that the first scatterer is in a moving state, the moving speed of the first scatterer is 10 m / s, and the moving direction of the first scatterer is the x-axis direction.

[0166] Optionally, the first message may further include configuration information of the access network device, wherein the configuration information of the access network device includes location information of the access network device and / or antenna information of the access network device.

[0167] Optionally, the antenna information of the access network device may include at least one of antenna height information, antenna size information, antenna type information, antenna downtilt angle information, antenna pattern information and antenna main lobe direction information.

[0168] The antenna height information indicates the vertical distance from the antenna for receiving and sending signals in the access network device to the geoid (or mean sea level).

[0169] Optionally, the antenna size information includes the length, width and height information of the antenna, which can be represented by coordinates.

[0170] Exemplarily, a three-dimensional coordinate system is established with the center position of the access network device as the origin, and the antenna size information can be represented by the coordinates of each vertex of the antenna.

[0171] The antenna type information may include ultra-long wave antenna, long wave antenna, medium wave antenna, short wave antenna, ultra-short wave antenna, and microwave antenna. It should be understood that the above antenna classification is based on the classification of the antenna working wavelength, and can also be classified in other ways, such as according to the working properties of the antenna, it can be divided into transmitting antenna and receiving antenna, and the embodiments of the present application do not make specific restrictions on this.

[0172] Antenna pattern information refers to the graph of the relative field strength of the radiation field changing with direction at a preset distance from the antenna, usually represented by two mutually perpendicular plane patterns in the direction of the antenna's maximum radiation. Antenna main lobe direction information is the direction of the maximum radiation beam on the antenna pattern.

[0173] Optionally, the first message may also include a first channel measurement result.

[0174] Optionally, the first channel measurement result indicates a channel measurement result of a location where a terminal device with a high signal to interference and noise ratio (SINR) is located, and the channel measurement result is a measured channel measurement result. The first channel measurement result may include at least one of channel state information, channel statistical covariance matrix information, channel angle power spectrum information, channel power delay spectrum information, and channel path loss information.

[0175] Optionally, the first channel measurement result also includes other information characterizing the spatial domain, time domain, frequency domain, angle domain, Doppler domain, and delay domain characteristics of the channel, which is not limited in this embodiment of the present application.

[0176] Specifically, the access network device can measure the channel through pilot signals such as a channel sounding reference signal (SRS) and a channel state information reference signal (CSI-RS) to obtain channel measurement data. Among them, the access network device can receive an SRS from a first terminal device, and the access network device can analyze the received SRS to estimate the channel measurement data. Alternatively, the access network device can also send a CSI-RS to the first terminal device, and the first terminal device can estimate the channel measurement data by receiving and decoding the CSI-RS. After the first terminal device estimates the channel measurement data, it can send the channel measurement data to the access network device.

[0177] Optionally, the access network device may calculate the signal to interference plus noise ratio of the channel at the location of each terminal device based on the channel measurement data; when the signal to interference plus noise ratio of the channel at the location of the terminal device is higher than a preset threshold, the access network device may calculate the first channel measurement result at the location of the terminal device based on the channel measurement data.

[0178] Specifically, the access network device may calculate the first channel measurement result by using a space-alternating generalized expectation-maximization (SAGE) algorithm according to the first channel measurement data.

[0179] It should be understood that the access network device may also calculate the first channel measurement result according to other algorithms, and the embodiment of the present application does not impose any specific limitation on this.

[0180] Optionally, the first message may be obtained by the access network device through sensing the environment based on sensing devices such as radar, infrared sensor, camera, point cloud laser scanner, and communication pilot signal.

[0181] S104. The channel characteristic map management device determines a channel characteristic map according to the first message.

[0182] The channel characteristic map includes a plurality of grids at a geographical location and channel characteristic information corresponding to each of the plurality of grids.

[0183] Optionally, the channel characteristic map management device determines different channel characteristic maps at different frequency points according to the first message.

[0184] Optionally, when the channel characteristic map management device is located in a core network element, the channel characteristic map management device may include a spectrum management unit MMF, and the MMF may determine the channel characteristic map according to the first message. Alternatively, the channel characteristic map management device may include an access and mobility management unit AMF, and the AMF may also determine the channel characteristic map according to the first message.

[0185] Optionally, the channel characteristic map management device may also determine the channel characteristic map through other units or network elements, and this embodiment of the present application does not specifically limit this.

[0186] In one embodiment, the channel characteristic map management device may construct a channel characteristic map according to the first message.

[0187] Exemplarily, the channel characteristic map management device may construct a channel characteristic map according to the material or electromagnetic coefficient of the first scatterer, and the relative position relationship between the first scatterer and the access network device and / or the first terminal device.

[0188] As another example, the channel characteristic map management device can construct a channel characteristic map based on the material or electromagnetic coefficient of the first scatterer, the relative position relationship between the first scatterer and the access network device and / or the first terminal device, channel multipath information, and configuration information of the access network device.

[0189] As another example, the channel characteristic map management device can construct a channel characteristic map based on the material or electromagnetic coefficient of the first scatterer, the relative position relationship between the first scatterer and the access network device and / or the first terminal device, channel multipath information, configuration information of the access network device, contour information of the first scatterer, the movement identification of the first scatterer, the movement speed information of the first scatterer, and the movement direction information of the first scatterer.

[0190] Among them, the material or electromagnetic coefficient of the first scatterer can improve the accuracy of electromagnetic calculations, and constructing a channel characteristic map based on the above-mentioned other first messages can effectively improve the accuracy of channel characteristic map construction.

[0191] Optionally, the channel characteristic map management device can construct the channel characteristic map by using full-wave simulation, ray tracing and other methods. Among them, the channel characteristic map constructed by the full-wave simulation method has a high computational complexity, and the requirements for computing resources and time are relatively high, and the obtained channel characteristic map has a high accuracy. The channel characteristic map constructed by the ray tracing method has a low computational complexity, and the requirements for computing resources and time are relatively low, and the obtained channel characteristic map has a high efficiency.

[0192] Optionally, the channel characteristic map management device may also construct channel characteristic maps for multipath complex areas and multipath simple areas using different methods, so as to obtain high-precision channel characteristic maps simply and efficiently.

[0193] For example, for complex multipath areas, a full-wave simulation method with higher computational complexity is used to construct a channel characteristic map to obtain a high-precision channel characteristic map; for simple multipath areas, a ray tracing method with lower computational complexity is used to construct a channel characteristic map, which can also obtain a high-precision channel characteristic map and reduce the requirements for computing resources and time.

[0194] In another embodiment, the channel characteristic map management device may also update the channel characteristic map according to the first message.

[0195] Exemplarily, the channel characteristic map management device may update the channel characteristic map according to the material or electromagnetic coefficient of the first scatterer, and the relative position relationship between the first scatterer and the access network device and / or the first terminal device.

[0196] As another example, the channel characteristic map management device can update the channel characteristic map based on the material or electromagnetic coefficient of the first scatterer, the relative position relationship between the first scatterer and the access network device and / or the first terminal device, channel multipath information, and configuration information of the access network device.

[0197] As another example, the channel characteristic map management device can update the channel characteristic map based on the material or electromagnetic coefficient of the first scatterer, the relative position relationship between the first scatterer and the access network device and / or the first terminal device, channel multipath information, configuration information of the access network device, contour information of the first scatterer, the movement identification of the first scatterer, the movement speed information of the first scatterer, and the movement direction information of the first scatterer.

[0198] As another example, the channel characteristic map management device can update the channel characteristic map according to the first channel measurement result. In this way, the channel characteristic map management device does not need to use full-wave simulation, ray tracing and other methods to calculate the channel characteristic information, and the update speed is fast.

[0199] Among them, the material or electromagnetic coefficient of the first scatterer can improve the accuracy of electromagnetic calculations, and updating the channel characteristic map according to the above-mentioned other first messages can effectively improve the accuracy of channel characteristic map construction.

[0200] Optionally, the channel characteristic map management device may update all channel characteristic maps according to the first message, or may update part of the channel characteristic maps according to the first message.

[0201] Optionally, the channel characteristic map management device may only update the grids corresponding to the areas including dynamic changes in the channel characteristic map.

[0202] For example, Figure 8 As shown, the channel characteristic map includes a first scatterer, a second scatterer, a third scatterer and a fourth scatterer, wherein the first scatterer, the second scatterer and the third scatterer are dynamic scatterers. For example, they are a moving car, a bicycle, etc. The area formed by the lines connecting the first scatterer, the second scatterer and the third scatterer is a dynamically changing area M, and the channel characteristic map management device can only update the channel characteristic map of the grid including the dynamically changing area M. The dynamically changing area M can be determined based on the contour information of the first scatterer, the second scatterer and the third scatterer, such as determining the dynamically changing area M based on the contour coordinates of the first scatterer, the second scatterer and the third scatterer.

[0203] Optionally, the channel characteristic map management device may update the channel characteristic map according to the first message through full-wave simulation, ray tracing and other methods.

[0204] Specifically, according to the first message, the channel characteristic information of the grid including the dynamically changing area M is calculated through full-wave simulation, ray tracing and other methods, and the channel characteristic information of the corresponding grid in the channel characteristic map is updated to the calculated channel characteristic information.

[0205] Alternatively, when the first message includes the first channel measurement result, the channel characteristic map management device may update the channel characteristic information of the grid corresponding to the location of the first terminal device with a high signal-to-noise ratio in the channel characteristic map to the channel characteristic information of the grid corresponding to the location of the first terminal device in the first channel measurement result. In this way, the channel characteristic map management device does not need to obtain the channel characteristic information through complex calculations, and the update speed is fast.

[0206] S105. The access network device sends a first channel characteristic map request message to the channel characteristic map management apparatus.

[0207] Optionally, the first channel characteristic map request message may be a request for all channel characteristic maps, or a request for a channel characteristic map of an area covered by an access network device, or a request for a channel characteristic map within the coverage area of ​​other access network devices adjacent to the access network device, or a request for a channel characteristic map of the location of the first terminal device, or a request for a channel characteristic map corresponding to a grid within a certain distance range of the first terminal device. The first channel characteristic map request message may be a request for a channel characteristic map of other locations, and the embodiments of the present application do not impose specific restrictions on this.

[0208] Exemplarily, the channel characteristic map includes 9 grids, the access network device coverage area includes grids 1 to 6, and the first terminal device is located in the second grid. The first channel characteristic map request message can request the channel characteristic maps of all 9 grids, or request the channel characteristic maps of grids 1 to 6 in the access network device coverage area, or request the channel characteristic map located in the second grid.

[0209] S106. The channel characteristic map management device sends a channel characteristic map corresponding to the access network device to the access network device.

[0210] Optionally, the channel characteristic map management device may send the channel characteristic map to the access network device, or may send the channel characteristic map grid index to the access network device.

[0211] S107. The first terminal device sends a second channel characteristic map request message to the access network device.

[0212] Optionally, the second channel characteristic map request message may be a request for all channel characteristic maps, or a request for a channel characteristic map of the location of the first terminal device, or a request for a channel characteristic map corresponding to a grid within a certain distance range of the first terminal device. The second channel characteristic map request message may be a request for a channel characteristic map of other locations, and the embodiments of the present application do not impose specific restrictions on this.

[0213] Exemplarily, the channel characteristic map includes 9 grids, and the first terminal device is located in the second grid. The second channel characteristic map request message can request the channel characteristic maps of all 9 grids, or request the channel characteristic map located in the second grid, or request the channel characteristic map located in the fifth grid.

[0214] S108. The access network device sends a channel characteristic map corresponding to the first terminal device to the first terminal device.

[0215] Optionally, the access network device may send a channel characteristic map corresponding to the first terminal device to the first terminal device via RRC, MAC-CE, PDSCH, PDCCH, etc.

[0216] Optionally, the access network device may send a channel characteristic map to the first terminal device, or may send a channel characteristic map grid index to the first terminal device.

[0217] In one embodiment, steps S105-S108 are merely an example, and the embodiment of the present application may not include steps S105-S108, and the embodiment of the present application does not make any specific limitations.

[0218] In this way, the access network device or the first terminal device can obtain the required high-precision channel characteristic map, implement channel measurement with low pilot overhead, and solve the problem of limited pilot measurement resources in the wireless communication system.

[0219] Optionally, the access network equipment can design a dynamic refined codebook that matches the regional channel characteristics based on the high-precision channel characteristic map to improve the codebook accuracy; design a regionalized pilot mode to reduce pilot overhead. The access network equipment can also obtain a priori channel information based on the high-precision channel characteristic map and obtain high-dimensional channel information through extremely low-dimensional measurements. For example: enable high-precision Bayesian channel estimation with hot start; design an observation matrix to reduce the number of observations required for compressed sensing channel estimation, etc.

[0220] Optionally, after the channel characteristic map is constructed, the method flow chart of the channel characteristic map management device updating the channel characteristic map according to the first channel measurement information can be as follows: Fig. 9 As shown, the channel feature map updating method can be applied to Figure 2 The communication system shown.

[0221] like Fig. 9 As shown, the channel characteristic map determination method includes the following steps:

[0222] S201. The first terminal device sends a channel reference signal to an access network device.

[0223] Optionally, the first terminal device may send an SRS to the access network device.

[0224] S202: The access network device calculates a channel measurement result and sends it to a channel characteristic map management device.

[0225] Optionally, the access network device may analyze the SRS from the first terminal device to estimate channel measurement data.

[0226] Optionally, the access network device may also send the CSI-RS to the first terminal device, and the first terminal device may estimate the channel measurement data by receiving and decoding the CSI-RS. After the first terminal device estimates the channel measurement data, it may send the channel measurement data to the access network device. The present application does not specifically limit the method for obtaining the channel measurement data.

[0227] Optionally, the access network device may also calculate the signal to interference plus noise ratio of the channel at the location of each terminal device based on the channel measurement data. When the signal to interference plus noise ratio of the channel at the location of the terminal device is higher than a preset threshold, the access network device may calculate the first channel measurement result at the location of the terminal device based on the channel measurement data.

[0228] Specifically, the access network device may calculate the first channel measurement result by using the SAGE algorithm according to the first channel measurement data.

[0229] It should be understood that the access network device may also calculate the first channel measurement result according to other algorithms, and the embodiment of the present application does not impose any specific limitation on this.

[0230] S203: The channel characteristic map management device updates the channel characteristic map according to the first channel measurement result.

[0231] Optionally, the channel characteristic map management device can update the channel characteristic information of the grid corresponding to the location of the first terminal device with a high signal-to-noise ratio in the channel characteristic map to the channel characteristic information of the grid corresponding to the location of the first terminal device in the first channel measurement result. In this way, the channel characteristic map management device does not need to obtain the channel characteristic information through complex calculations, and the update speed is fast.

[0232] It should be noted that the above-mentioned multiple embodiments can be combined and the combined scheme can be implemented. Optionally, some operations in the process of each method embodiment are optionally combined, and / or the order of some operations is optionally changed. In addition, the execution order between the steps of each process is only exemplary and does not constitute a limitation on the execution order between the steps. There can also be other execution orders between the steps. It is not intended to indicate that the execution order is the only order in which these operations can be performed. Ordinary technicians in this field will think of many ways to reorder the operations of this article. In addition, it should be pointed out that the process details involved in a certain embodiment of this article are also applicable to other embodiments in a similar manner, or different embodiments can be used in combination.

[0233] It is understandable that in order to implement the functions in the above embodiments, the channel feature map management device, the access network device and the terminal include hardware structures and / or software modules corresponding to the execution of each function. It should be easy for those skilled in the art to realize that, in combination with the units and method steps of each example described in the embodiments disclosed in this application, the present application can be implemented in the form of hardware or a combination of hardware and computer software. Whether a function is executed in the form of hardware or computer software driving hardware depends on the specific application scenario and design constraints of the technical solution.

[0234] Fig.10 and Fig.11 A schematic diagram of the structure of a possible communication device provided for an embodiment of the present application. These communication devices can be used to implement the functions of the channel characteristic map management device, terminal or access network device in the above method embodiment, and thus can also achieve the beneficial effects possessed by the above method embodiment. In an embodiment of the present application, the communication device can be a channel characteristic map management device, a terminal, or an access network device, or a module (such as a chip) applied to a channel characteristic map management device, a terminal or an access network device.

[0235] like Fig.10 As shown, the communication device 1300 includes a processing unit 1310 and a transceiver unit 1320. The communication device 1300 is used to implement the above Figure 5 , Fig. 9 The functions of the channel characteristic map management device, terminal or access network equipment in the method embodiment shown in FIG.

[0236] When the communication device 1300 is used to implement Figure 5The functions of the channel characteristic map management device in the method embodiment shown are: the transceiver unit 1320 is used to send a first request to the access network device and / or send a second request to the first terminal device; the transceiver unit 1320 is also used to receive a first message from the access network device; the transceiver unit 1320 is also used to receive a first channel characteristic map request message from the access network device, and in response to the message, send a corresponding channel characteristic map to the access network device. The processing unit 1310 is used to perform processing-related functions. For example, the processing unit 1310 can be used to perform Figure 5 All operations except the sending and receiving operations performed by the communication device in the illustrated embodiment, and / or other processes used to support the technology described herein, such as determining a channel characteristic map according to the first message.

[0237] When the communication device 1300 is used to implement Figure 5 The functions of the access network device in the method embodiment shown are as follows: the transceiver unit 1320 is used to receive a first request from a channel characteristic map management device, and in response to the request, sends a first message to the channel characteristic map management device; the transceiver unit 1320 is also used to receive a second message from a first terminal device; the transceiver unit 1320 is also used to send a first channel characteristic map request message to the channel characteristic map management device, and receive the requested channel characteristic map; the transceiver unit 1320 is also used to receive a second channel characteristic map request message from the first terminal device, and in response to the message, sends a corresponding channel characteristic map to the first terminal device. The processing unit 1310 is used to execute processing-related functions. For example, the processing unit 1310 can be used to execute Figure 5 All operations except the sending and receiving operations performed by the communication device in the illustrated embodiment, and / or other processes used to support the technology described herein, such as obtaining the first message according to the second message.

[0238] When the communication device 1300 is used to implement Figure 5 In the method embodiment shown, the functions of the first terminal device are: the transceiver unit 1320 is used to receive a second request from the channel characteristic map management device, and in response to the request, send a second message to the access network device; the transceiver unit 1320 is also used to send a second channel characteristic map request message to the access network device and receive the requested channel characteristic map; the processing unit 1310 is used to perform processing related functions. For example, the processing unit 1310 can be used to perform Figure 5 All operations except the transceiver operations performed by the communication device in the illustrated embodiment, and / or other processes for supporting the technology described herein.

[0239] When the communication device 1300 is used to implement Fig. 9In the method embodiment shown, the functions of the channel feature map management device are: the transceiver unit 1320 is used to receive the first channel measurement result from the access network device; the processing unit 1310 is used to perform processing related functions. For example, the processing unit 1310 can be used to perform Figure 5 All operations except the transceiver operations performed by the communication device in the illustrated embodiment, and / or other processes used to support the technology described herein, such as determining a channel characteristic map according to the first channel measurement result.

[0240] When the communication device 1300 is used to implement Fig. 9 In the method embodiment shown, the functions of the access network device are: the transceiver unit 1320 is used to receive the channel reference signal from the first terminal device; the transceiver unit 1320 is also used to send the first channel measurement result to the channel feature map management device. The processing unit 1310 is used to perform processing related functions. For example, the processing unit 1310 can be used to perform Figure 5 All operations except the transceiver operations performed by the communication device in the illustrated embodiment, and / or other processes used to support the technology described herein, such as obtaining a first channel measurement result according to a channel reference signal.

[0241] When the communication device 1300 is used to implement Fig. 9 In the method embodiment shown, the functions of the first terminal device are: the transceiver unit 1320 is used to send a channel reference signal to the access network device; the processing unit 1310 is used to perform processing related functions. For example, the processing unit 1310 can be used to perform Figure 5 All operations except the transceiver operations performed by the communication device in the illustrated embodiment, and / or other processes for supporting the technology described herein.

[0242] For more detailed description of the processing unit 1310 and the transceiver unit 1320, please refer to Figure 5 and Fig. 9 The processing unit 1310 and the transceiver unit 1320 may also perform other steps, and the specific implementation may refer to the method embodiment, which will not be described here.

[0243] Optionally, the transceiver unit 1320 may be a transceiver, and the transceiver may include an antenna and a radio frequency circuit, etc.

[0244] The processing unit 1310 may be a processor (or a processing circuit), such as a baseband processor, which may include one or more CPUs.

[0245] like Fig.11As shown, the communication device 1400 includes a processor 1410 and an interface circuit 1420. The processor 1410 and the interface circuit 1420 are coupled to each other. It is understood that the interface circuit 1420 can be a transceiver or an input-output interface. Optionally, the communication device 1400 may also include a memory 1430 for storing instructions executed by the processor 1410 or storing input data required by the processor 1410 to execute instructions or storing data generated after the processor 1410 executes instructions.

[0246] When the communication device 1400 is used to implement Figure 5 or Fig. 9 When the method shown in the above is performed, the processor 1410 is used to implement the function of the above processing unit 1310, and the interface circuit 1420 is used to implement the function of the above transceiver unit 1320.

[0247] When the above-mentioned communication device is a chip applied to a channel characteristic map management device, the channel characteristic map management device chip realizes the function of the channel characteristic map management device in the above-mentioned method embodiment. The channel characteristic map management device chip receives information from the access network device, which can be understood as the information is first received by other modules in the channel characteristic map management device (such as a radio frequency module or an antenna), and then sent to the channel characteristic map management device chip by these modules. The channel characteristic map management device chip sends information to the access network device, which can be understood as the information is first sent to other modules in the channel characteristic map management device (such as a radio frequency module or an antenna), and then sent to the access network device and / or terminal by these modules.

[0248] When the above-mentioned communication device is a chip applied to a terminal, the terminal chip implements the functions of the terminal in the above-mentioned method embodiment. The terminal chip receives information from the access network device, which can be understood as the information is first received by other modules in the terminal (such as a radio frequency module or an antenna), and then sent to the terminal chip by these modules. The terminal chip sends information to the access network device, which can be understood as the information is first sent to other modules in the terminal (such as a radio frequency module or an antenna), and then sent to the access network device by these modules.

[0249] When the above-mentioned communication device is a chip applied to an access network device, the access network device chip implements the functions of the access network device in the above-mentioned method embodiment. The access network device chip receives information from the terminal and / or the channel characteristic map management device, which can be understood as the information is first received by other modules in the access network device (such as a radio frequency module or an antenna), and then sent to the access network device chip by these modules. The access network device chip sends information to the terminal and / or the channel characteristic map management device, which can be understood as the information is sent to other modules in the access network device (such as a radio frequency module or an antenna), and then sent to the terminal and / or the channel characteristic map management device by these modules.

[0250] Fig.10 or Fig.11 The communication device shown is only an example and in actual applications the communication device may have more Fig.10 or Fig.11 More or fewer components may be shown, two or more components may be combined, or there may be a different configuration of components.

[0251] In the present application, when entity A sends information to entity B, it can be that A sends it directly to B, or that A sends it indirectly to B through other entities. Similarly, when entity B receives information from entity A, it can be that entity B directly receives the information sent by entity A, or that entity B indirectly receives the information sent by entity A through other entities. Entities A and B here can be RAN nodes or terminals, or modules inside RAN nodes or terminals. The sending and receiving of information can be information interaction between a RAN node and a terminal, for example, information interaction between a base station and a terminal; the sending and receiving of information can also be information interaction between two RAN nodes, for example, information interaction between a CU and a DU; the sending and receiving of information can also be information interaction between different modules inside a device, for example, information interaction between a terminal chip and other modules of the terminal, or information interaction between an access network chip and other modules in the access network, or information interaction between a channel characteristic map management device chip and other modules in the channel characteristic map management device.

[0252] It is understandable that the processor in the embodiments of the present application may be a central processing unit (CPU), or other general-purpose processors, digital signal processors (DSP), application specific integrated circuits (ASIC), field programmable gate arrays (FPGA) or other programmable logic devices, transistor logic devices, hardware components or any combination thereof. The general-purpose processor may be a microprocessor or any conventional processor.

[0253] The method steps in the embodiments of the present application can be implemented in hardware or in software instructions that can be executed by a processor. The software instructions can be composed of corresponding software modules, and the software modules can be stored in random access memory, flash memory, read-only memory, programmable read-only memory, erasable programmable read-only memory, electrically erasable programmable read-only memory, register, hard disk, mobile hard disk, CD-ROM or any other form of storage medium known in the art. An exemplary storage medium is coupled to the processor so that the processor can read information from the storage medium and write information to the storage medium. The storage medium can also be a component of the processor. The processor and the storage medium can be located in an ASIC. In addition, the ASIC can be located in a base station or a terminal. The processor and the storage medium can also be present in a base station or a terminal as discrete components.

[0254] In the above embodiments, it can be implemented in whole or in part by software, hardware, firmware or any combination thereof. When implemented by software, it can be implemented in whole or in part in the form of a computer program product. The computer program product includes one or more computer programs or instructions. When the computer program or instruction is loaded and executed on a computer, the process or function described in the embodiment of the present application is executed in whole or in part. The computer may be a general-purpose computer, a special-purpose computer, a computer network, a network device, a user device or other programmable device. The computer program or instruction may be stored in a computer-readable storage medium, or transmitted from one computer-readable storage medium to another computer-readable storage medium, for example, the computer program or instruction may be transmitted from one website site, computer, server or data center to another website site, computer, server or data center by wired or wireless means. The computer-readable storage medium may be any available medium that a computer can access or a data storage device such as a server, data center, etc. that integrates one or more available media. The available medium may be a magnetic medium, for example, a floppy disk, a hard disk, a tape; it may also be an optical medium, for example, a digital video disc; it may also be a semiconductor medium, for example, a solid-state hard disk. The computer-readable storage medium may be a volatile or nonvolatile storage medium, or may include both volatile and nonvolatile types of storage media.

[0255] In the various embodiments of the present application, unless otherwise specified or provided for in any logical conflict, the terms and / or descriptions between the different embodiments are consistent and may be referenced to each other, and the technical features in the different embodiments may be combined to form new embodiments according to their inherent logical relationships.

Claims

1. A channel characteristic map determination method, applied to a channel characteristic map management device, characterized in that: include: Receiving a first message from an access network device, wherein the first message includes first information, and the first message also includes at least one of second information and third information; The first information indicates the material or electromagnetic coefficient of the first scatterer, the second information indicates the relative position relationship between the first scatterer and the first terminal device; the third information indicates the relative position relationship between the first scatterer and the access network device; A channel characteristic map is determined according to the first message, where the channel characteristic map includes a plurality of grids at a geographical location and channel characteristic information corresponding to each of the plurality of grids.

2. The method according to claim 1, characterized in that: The method further comprises: Receiving a first channel characteristic map request message from the access network device, wherein the first channel characteristic map request message requests to send a channel characteristic map corresponding to a first terminal device or the access network device; A channel characteristic map response message is sent to the access network device, where the channel characteristic map response message includes the channel characteristic map corresponding to the first terminal device or the access network device.

3. The method according to claim 1 or 2, characterized in that: The first message also includes profile information of the first scatterer.

4. The method according to any one of claims 1 to 3, characterized in that: The first message also includes channel multipath information, and the channel multipath information includes at least one of multipath quantity information, multipath angle spread information, and multipath delay spread information.

5. The method according to any one of claims 1 to 4, characterized in that: The first message also includes configuration information of the access network device, the configuration information of the access network device includes location information of the access network device and / or antenna information of the access network device, the antenna information includes at least one of antenna height information, antenna size information, antenna type information, antenna downtilt angle information, antenna pattern information and antenna main lobe direction information.

6. The method according to any one of claims 1 to 5, characterized in that: The first message also includes at least one of a moving identifier of the first scatterer, moving speed information of the first scatterer, and moving direction information of the first scatterer.

7. The method according to any one of claims 1 to 6, characterized in that: The first message also includes a first channel measurement result; the first channel measurement result includes at least one of channel state information, channel statistical covariance matrix information, channel angle power spectrum information, channel power delay spectrum information, and channel path loss information.

8. The method according to any one of claims 1 to 7, characterized in that: Before receiving the first message, the method includes: Sending a first request to the access network device, where the first request instructs the access network device to send the first message; or, A second request is sent to the first terminal device, where the second request instructs the first terminal device to send a second message, where the second message includes the first information and second information.

9. A channel feature map construction method, applied to access network equipment, characterized in that: include: A first message is sent to a channel characteristic map management device, wherein the first message includes first information, and the first message also includes at least one of second information and third information; the first information indicates the material or electromagnetic coefficient of the first scatterer, and the second information indicates the relative position relationship between the first scatterer and the first terminal device; the third information indicates the relative position relationship between the first scatterer and the access network device.

10. The method according to claim 9, characterized in that The method further includes: receiving a second message from the first terminal device, wherein the second message includes the first information and second information.

11. The method according to claim 9 or 10, characterized in that: The method further comprises: Sending a first channel characteristic map request message to a channel characteristic map management device, wherein the first channel characteristic map request message requests sending a channel characteristic map corresponding to a first terminal device or an access network device; A first channel characteristic map response message is received from a channel characteristic map management device, where the first channel characteristic map response message includes a channel characteristic map corresponding to the first terminal device or the access network device.

12. The method according to any one of claims 9 to 11, characterized in that: The method further comprises: receiving a second channel characteristic map request message from the first terminal device, wherein the second channel characteristic map request message requests to send a channel characteristic map corresponding to the first terminal device; A second channel characteristic map response message is sent to the first terminal device, where the second channel characteristic map response message includes a channel characteristic map corresponding to the first terminal device.

13. The method according to any one of claims 9 to 12, characterized in that: The first message further includes fourth information indicating a first scatterer profile.

14. The method according to any one of claims 9 to 13, characterized in that: The second message further includes fourth information indicating a first scatterer profile.

15. The method according to any one of claims 9 to 14, characterized in that: The first message also includes channel multipath information, where the channel multipath information indicates at least one of multipath quantity information, angle spread information, and delay spread information.

16. The method according to any one of claims 9 to 15, characterized in that: The second message also includes channel multipath information of the location of the first terminal device, and the channel multipath information indicates at least one of multipath quantity information, angle extension information, and delay extension information.

17. The method according to any one of claims 9 to 16, characterized in that: The first message also includes access network device configuration information; The access network device configuration information includes at least one of the access network device location information, the access network device antenna height, the access network device antenna size, the access network device antenna type, the access network device antenna downtilt angle, the access network device antenna radiation pattern, and the access network device antenna main lobe direction.

18. The method according to any one of claims 9 to 17, characterized in that: The first message also includes at least one of a first scatterer movement identifier, a first scatterer movement speed, and a first scatterer movement direction.

19. The method according to any one of claims 9 to 18, characterized in that: The second message also includes at least one of a first scatterer movement identifier, a first scatterer movement speed, and a first scatterer movement direction.

20. The method according to any one of claims 9 to 19, characterized in that: The first message also includes a first channel measurement result; the first channel measurement result includes at least one of channel state information, channel statistical covariance matrix information, channel angle power spectrum information, channel power delay spectrum information, and channel path loss information.

21. The method according to any one of claims 9 to 20, characterized in that: Before sending the first message, the method includes: A first request is received, where the first request instructs the access network device to send the first message.

22. A channel feature map construction method, applied to a first terminal device, characterized in that: include: Sending a second message to the access network device, where the second message includes the first information and the second information; The first information indicates the material or electromagnetic coefficient of the first scatterer, and the second information indicates the relative position relationship between the first scatterer and the first terminal device.

23. The method according to claim 22, characterized in that The method further comprises: Sending a second channel characteristic map request message to the access network device, wherein the second channel characteristic map request message requests sending a channel characteristic map corresponding to the first terminal device; A channel characteristic map response message is received from the access network device, where the channel characteristic map response message includes a channel characteristic map corresponding to the first terminal device.

24. The method according to claim 22 or 23, characterized in that The second message further includes fourth information indicating a first scatterer profile.

25. The method according to any one of claims 22 to 24, characterized in that: The second message also includes channel multipath information, where the channel multipath information indicates at least one of multipath quantity information, angle spread information, and delay spread information.

26. The method according to any one of claims 22 to 25, characterized in that: The second message also includes at least one of a first scatterer movement identifier, a first scatterer movement speed, and a first scatterer movement direction.

27. A communication device, characterized in that: It includes a processor and an interface circuit, wherein the interface circuit is used to receive signals from other communication devices and transmit them to the processor or send signals from the processor to other communication devices, and the processor is used to implement the method as described in any one of claims 1 to 8, or implement the method as described in any one of claims 9-21, or implement the method as described in any one of claims 22-26 through a logic circuit or executing code instructions.

28. A computer-readable storage medium, characterized in that: The storage medium stores a computer program or instruction. When the computer program or instruction is executed by the communication device, it implements the method as described in any one of claims 1 to 8, or implements the method as described in any one of claims 9 to 21, or implements the method as described in any one of claims 22 to 26.

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