Method executed by first node in communication system and first node

Abstract

The invention discloses a method executed by a first node in a communication system and the first node, and belongs to the technical field of wireless communication. The method comprises the following steps: receiving a first signal; and determining whether the first signal is a power normalized signal, and performing channel estimation by adopting a first mode or a second mode based on a determination result of the first signal. Based on the scheme provided by the embodiment of the invention, the channel estimation effect can be improved, and the channel estimation requirement can be better met.

Description

Technical Field

[0001] The present disclosure relates to the technical field of wireless communications, and more particularly, to a method performed by a first node in a communication system and the first node. Background Art

[0002] Considering the development of wireless communication from generation to generation, these technologies are mainly developed for services targeting people, such as voice calls, multimedia services, and data services. With the commercialization of the fifth-generation (5G) communication system, the number of connected devices is expected to grow exponentially. These will be increasingly connected to the communication network. Examples of the Internet of Things can include vehicles, robots, drones, home appliances, displays, smart sensors connected to various infrastructures, construction machinery, and factory equipment. Mobile devices are expected to develop in various forms such as augmented reality glasses, virtual reality headsets, and holographic devices. Efforts have been made to develop improved 6G communication systems in order to provide various services by connecting hundreds of billions of devices and things in the sixth-generation (6G) era. For these reasons, 6G communication systems are called super 5G systems.

[0003] The 6G communication system, which is expected to be commercialized around 2030, will have a peak data rate of tera (1,000 gigabits) bps and a radio latency of less than 100 μsec, thus being 50 times the data rate of the 5G communication system and having 1 / 10 of its radio latency.

[0004] In order to achieve such high data rates and ultra-low latency, the implementation of 6G communication systems in terahertz (e.g., 95GHz to 3THz bands) has been considered. It is expected that since the path loss and atmospheric absorption in the terahertz band are more serious than those in the millimeter wave (mmWave) band introduced in 5G, the technology that can ensure the signal transmission distance (i.e., coverage) will become more critical. As the main technology to ensure coverage, it is necessary to develop radio frequency (RF) elements, antennas, new waveforms with better coverage than orthogonal frequency division multiplexing (OFDM), beamforming and massive multiple input multiple output (MIMO), full dimensional multiple input multiple output (FD-MIMO), array antennas, and multi-antenna transmission technologies such as massive antennas. In addition, new technologies have been discussed to improve signal coverage in the terahertz band, such as metamaterial-based lenses and antennas, orbital angular momentum (OAM), and reconfigurable intelligence surface (RIS).

[0005] In addition, in order to improve spectrum efficiency and overall network performance, the following technologies have been developed for 6G communication systems: full-duplex technology for enabling uplink and downlink transmissions to use the same frequency resources simultaneously; network technology that utilizes satellites, high-altitude platform stations (HAPS), etc. in an integrated manner; improved network structure to support mobile base stations, etc., and to enable network operation optimization and automation, etc.; dynamic spectrum sharing technology with conflict avoidance based on spectrum usage prediction: using artificial intelligence (AI) in wireless communications to improve overall network operations by utilizing AI from the design stage of developing 6G and internalizing end-to-end AI support functions; and next-generation distributed computing technology that overcomes the computing power limitations of user equipment (UE) through ultra-high performance communication and computing resources achievable on the network (such as mobile edge computing (MEC), cloud, etc.). In addition, attempts are continuing to strengthen connectivity between devices, optimize networks, promote software-based network entities, and increase openness of wireless communications by designing new protocols to be used in 6G communication systems, developing mechanisms for implementing hardware-based security environments and secure use of data, and developing technologies for maintaining privacy.

[0006] It is expected that the research and development of 6G communication systems including hyperconnectivity of person to machine (P2M) and machine to machine (M2M) will bring about the next hyperconnectivity experience. In particular, services such as truly immersive extended reality (XR), high-fidelity mobile holograms, and digital replicas are expected to be provided through 6G communication systems. In addition, services such as remote surgery, industrial automation, and emergency response for enhanced safety and reliability will be provided through 6G communication systems, making the technology applicable to various fields such as industry, healthcare, automobiles, and home appliances. Summary of the invention

[0007] The purpose of the embodiments of the present disclosure is to provide a method, a first node, and a storage medium executed by a first node in a communication system that can better meet wireless communication requirements. To achieve this purpose, the technical solutions provided by the embodiments of the present disclosure are as follows:

[0008] In one aspect, an embodiment of the present disclosure provides a method performed by a first node in a communication system, the method comprising:

[0009] receiving a first signal;

[0010] determining whether the first signal is a power-normalized signal;

[0011] When the first signal is a power-normalized signal, a first method is used to perform channel estimation based on the first signal; when the first signal is a signal that has not been power-normalized, a second method is used to perform channel estimation based on the first signal.

[0012] On the other hand, an embodiment of the present disclosure provides a method performed by a second node in a communication system, the method comprising:

[0013] Sending a first signal, wherein the first signal is a power-normalized signal or a signal that is not power-normalized;

[0014] If the first signal is a power-normalized signal, the first signal is used to perform channel estimation using a first method; if the first signal is a signal that is not power-normalized, the first signal is used to perform channel estimation using a second method.

[0015] On the other hand, an embodiment of the present disclosure provides a node in a wireless communication system, the node comprising a transceiver and at least one processor coupled to the transceiver, the at least one processor being configured to execute the method provided by any embodiment of the present disclosure.

[0016] Optionally, the node is a first node, and the at least one processor is configured to execute the method performed by the first node provided in any embodiment of the present disclosure.

[0017] Optionally, the node is a second node, and the at least one processor is configured to execute the method performed by the second node provided in any embodiment of the present disclosure.

[0018] On the other hand, an embodiment of the present disclosure further provides a computer-readable storage medium, in which a computer program is stored. When the computer program is executed by a processor, the method provided by any embodiment of the present disclosure is executed.

[0019] On the other hand, a computer program product is provided. The product includes a computer program. When the computer program is executed by a processor, the method provided in any optional embodiment of the present disclosure is executed.

[0020] The beneficial effects brought about by the technical solution provided by the embodiments of the present disclosure will be introduced below in conjunction with specific embodiments. BRIEF DESCRIPTION OF THE DRAWINGS

[0021] Figure 1 A schematic diagram showing the structure of a wireless network system applicable to an embodiment of the present disclosure is shown;

[0022] Figure 2A schematic diagram of the structure of an example base station according to the present disclosure is shown;

[0023] Figure 3 A schematic diagram showing the structure of an example user equipment according to the present disclosure is shown;

[0024] Figure 4 A schematic flow chart of a method performed by a first node according to an embodiment of the present disclosure is shown;

[0025] Figure 5 A flow chart of a communication method provided by an embodiment of the present disclosure is shown;

[0026] Figure 6 A schematic diagram of a physical signal before and after normalization provided by an embodiment of the present disclosure is shown;

[0027] Figure 7 A schematic diagram showing a peak-to-average power ratio of a physical signal before and after normalization provided by an embodiment of the present disclosure;

[0028] Figure 8 A schematic structural diagram of an electronic device provided by an embodiment of the present disclosure is shown. DETAILED DESCRIPTION

[0029] Before carrying out the following specific embodiments, it may be advantageous to set forth the definitions of certain words and phrases used throughout the patent document. The term "connection" and its derivatives refer to any direct or indirect communication between two or more elements, regardless of whether those elements are in physical contact with each other. The terms "send", "receive" and "communicate" and their derivatives include both direct and indirect communication. The terms "include" and "include" and their derivatives mean unrestricted inclusion. The term "or" is compatible, meaning and / or. The phrase "associated with" and its derivatives mean including, included, interconnected with it, including, included, connected to or connected with it, coupled to or coupled with it, can communicate with it, collaborate with it, interweave, juxtapose, approach, be bound to or bound with it, have, have the property of, have to ... or have a relationship with ... etc. The term "controller" means any device, system or part thereof that controls at least one operation. Such a controller can be implemented in a hardware manner or in a combination of hardware and software and / or firmware. The functionality associated with any particular controller, whether local or remote, may be centralized or distributed. The phrase "at least one of" when used with a list of items means that different combinations of one or more of the listed items may be used, and only one item in the list may be required. For example, "at least one of A, B, and C" includes any of the following combinations: A, B, C, A and B, A and C, B and C, and only A, only B, only C. Likewise, the term "set" means one or more. Thus, a set of items may be a single item or a set of two or more items.

[0030] Moreover, various functions as described below can be implemented or supported by one or more computer programs, each of which is formed by a computer-readable program code and embodied in a computer-readable medium. The terms "application" and "program" refer to one or more computer programs, software components, instruction sets, processes, functions, objects, categories, instances, related data, or a portion thereof suitable for implementation in a suitable computer-readable program code. The phrase "computer-readable program code" includes any type of computer code, including source code, object code, and executable code. The phrase "computer-readable medium" includes any type of medium that can be accessed by a computer, such as a read-only memory (ROM), a random access memory (RAM), a hard drive, a compact disc (CD), a digital video disc (DVD), or any other type of memory. "Non-transitory" computer-readable media excludes wired, wireless, optical, or other communication links that convey instantaneous electrical signals or other signals. Non-transitory computer-readable media include media in which data can be permanently stored and media in which data can be stored and rewritten later, such as rewritable optical discs or erasable memory devices.

[0031] Definitions for certain other words and phrases are provided throughout this patent document. Those of skill in the art should understand that in many, if not most instances, such definitions apply to prior, as well as future uses of such defined words and phrases.

[0032] The figures and various embodiments used to describe the principles of the present disclosure are included herein for illustration only and should not be construed in any way as limiting the scope of the present disclosure. In addition, those skilled in the art will appreciate that the principles of the present disclosure can be implemented in any appropriately arranged wireless communication system.

[0033] The following Figures 1 to 3 Various embodiments of the present disclosure are described as being implemented in a wireless communication system. Figures 1 to 3 The description is not meant to imply physical or architectural limitations to the manner in which different embodiments may be implemented. Different embodiments of the present disclosure may be implemented in any suitably arranged communications system.

[0034] Figure 1 An example wireless network according to an embodiment of the present disclosure is shown. Figure 1 The embodiment of the wireless network shown in FIG. 1 is for illustration only. Other embodiments of the wireless network 100 may be used without departing from the scope of the present disclosure.

[0035] like Figure 1As shown, the wireless network includes a base station (next generation nodeB, gNB or gNodeB) 101, gNB 102, and gNB 103. gNB 101 communicates with gNB 102 and gNB 103. gNB 101 also communicates with at least one network 130 such as the Internet, a proprietary Internet Protocol (IP) network, or other data network.

[0036] The gNB 102 provides wireless broadband access to a network 130 for a plurality of first user equipments (UEs) within a coverage area 120 of the gNB 102. The plurality of first UEs include a UE 111 that may be located at a small business (SB); a UE 112 that may be located at an enterprise (E); a UE 113 that may be located at a WiFi hot spot (HS); a UE 114 that may be located at a first residence (R1); a UE 115 that may be located at a second residence (R2); and a UE 116 that may be a mobile device (M) such as a cellular phone, a wireless laptop, a wireless personal digital assistant (PDA), etc. The gNB 103 provides wireless broadband access to the network 130 for a plurality of second UEs within a coverage area 125 of the gNB 103. The plurality of second UEs include UE 115 and UE 116 and subscriber stations (SS, e.g., UEs) 117, 118, and 119. In some embodiments, one or more of gNBs 101 103 may communicate with each other and UE 111 116 using existing wireless communication technologies, and one or more of UE 111 119 may communicate directly with each other (e.g., UE 117 119) using other existing or proposed wireless communication technologies.

[0037] Depending on the type of network, the term "base station" or "BS" may refer to any component (or collection of components) configured to provide wireless access to a network, such as a transmit point (TP), a transmit-receive point (TRP), an enhanced (or "evolved") base station (eNodeB or eNB), a 5G base station (gNB), a macro cell, a femto cell, a wireless fidelity (WiFi) access point (AP), or other wireless capable devices. A base station may provide wireless access according to one or more wireless communication protocols, such as 3GPP 5G new radio (NR), long term evolution (LTE), LTE-Advanced (LTE A), high speed packet access (HSPA), WiFi 802.11a / b / g / n / ac, etc. For convenience, various names of base station type devices and functions are used interchangeably in this patent document to refer to network infrastructure components that provide wireless access to remote terminals. Also, depending on the network type, the term "user equipment" (UE) may refer to any component such as a mobile station (MS), a subscriber station (SS), a remote terminal, a wireless terminal, a reception point, or a user device, etc. For convenience, various names of user equipment type devices and functions are used interchangeably in this patent document to refer to a remote wireless device that wirelessly accesses a BS regardless of whether the UE is a mobile device (such as a mobile phone or a smart phone) or a remote wireless device that is generally considered to be a fixed device (such as a desktop computer or a vending machine).

[0038] Dashed lines illustrate the approximate extents of coverage areas 120 and 125, which are shown as generally circular for purposes of illustration and explanation only. It should be clearly understood that coverage areas associated with a gNB, such as coverage areas 120 and 125, may have other shapes, including irregular shapes, depending on the configuration of the gNB and variations in the wireless environment associated with natural and artificial obstacles.

[0039] As described in more detail below, one or more of the UEs 111 119 include circuitry, programming, or a combination thereof. In certain embodiments, one or more of the gNBs 101 103 include circuitry, programming, or a combination thereof.

[0040] although Figure 1 An example of a wireless network is shown, but Figure 1Various changes may be made. For example, wireless network 100 may include any number of gNBs and any number of UEs in any suitable arrangement. Moreover, gNB 101 may communicate directly with any number of UEs and provide those UEs with wireless broadband access to network 130. Similarly, each gNB 102-103 may communicate directly with network 130 and provide UEs with direct wireless broadband access to network 130. In addition, gNBs 101, 102, and / or 103 may provide access to other or additional external networks such as an external telephone network or other types of data networks.

[0041] Figure 2 An example base station according to an embodiment of the present disclosure is shown. Figure 2 The embodiment of the gNB 102 shown in FIG. is for illustration only, and Figure 1 gNBs 101 and 103 may have the same or similar configurations. However, gNBs appear in a variety of configurations, and Figure 2 The scope of the present disclosure is not limited to any particular implementation of the gNB.

[0042] like Figure 2 As shown in FIG. 1 , gNB 102 includes multiple antennas 200a 200n, multiple radio frequency (RF) transceivers 201a 201n, a transmit (TX) processing circuit 203, and a receive (RX) processing circuit 204. gNB 102 also includes a controller / processor 205, a memory 206, and a backhaul or network interface (IF) 207.

[0043] The RF transceiver 201a 201n receives incoming RF signals from the antenna 200a 200n, such as signals sent by a UE in the network 100. The RF transceiver 201a 201n down-converts the incoming RF signals to generate an intermediate frequency (IF) or baseband signal. The IF or baseband signal is sent to the RX processing circuit 204, which generates a processed baseband signal by filtering, decoding and / or digitizing the baseband or IF signal. The RX processing circuit 204 sends the processed baseband signal to the controller / processor 205 for further processing.

[0044] The TX processing circuit 203 receives analog or digital data (such as voice data, web data, email, or interactive video game data) from the controller / processor 205. The TX processing circuit 203 encodes, multiplexes, and / or digitizes the outgoing baseband data to generate a processed baseband or IF signal. The RF transceiver 201a 201n receives the outgoing processed baseband or IF signal from the TX processing circuit 203 and up-converts the baseband or IF signal to an RF signal that is transmitted via the antenna 201a 201n.

[0045] Controller / processor 205 may include one or more processors or other processing devices that control the overall operation of gNB 102. For example, controller / processor 205 may control the reception of forward channel signals and the transmission of reverse channel signals by RF transceivers 201a 201n, RX processing circuitry 204, and TX processing circuitry 203 in accordance with well-known principles. Controller / processor 205 may also support additional functionality, such as more advanced wireless communication functionality.

[0046] For example, the controller / processor 205 may support beamforming or directional routing operations, in which outgoing signals from multiple antennas 200a-200n are weighted differently to effectively steer the outgoing signals in a desired direction. Any of a variety of other functions may be supported in the gNB 102 by the controller / processor 205.

[0047] The controller / processor 205 is also capable of executing programs and other processes, such as an operating system (OS), located in the memory 206. The controller / processor 205 can move data into or out of the memory 206 as required by the executing process.

[0048] The controller / processor 205 is also connected to a backhaul or network interface 207. The backhaul or network interface 207 allows the gNB 102 to communicate with other devices or systems via a backhaul connection or via a network. The interface 207 may support communication over any appropriate (one or more) wired or wireless connections. For example, when the gNB 102 is implemented as part of a cellular communication system (such as a cellular communication system supporting 5G, LTE, or LTE A), the interface 207 may allow the gNB 102 to communicate with other gNBs via a wired or wireless backhaul connection. When the gNB 102 is implemented as an access point, the interface 207 may allow the gNB 102 to communicate over a wired or wireless local area network or over a wired or wireless connection to a larger network (such as the Internet). The interface 207 includes any appropriate structure that supports communication over a wired or wireless connection such as an Ethernet or RF transceiver.

[0049] Memory 206 is connected to controller / processor 205. A portion of memory 206 may include random access memory (RAM), and another portion of memory 206 may include flash memory or other read-only memory (ROM).

[0050] although Figure 2 An example of gNB 102 is shown, but the Figure 2 For example, gNB 102 may include any number of Figure 2 As a specific example, the access point may include multiple interfaces 207, and the controller / processor 205 may support routing functions to route data between different network addresses. As another specific example, although shown as including a single instance of TX processing circuitry 203 and a single instance of RX processing circuitry 204, the gNB 102 may include multiple instances of each (such as one for each RF transceiver). For example, Figure 2 The various components in may be combined, further subdivided, or omitted, and additional components may be added according to specific needs.

[0051] Figure 3 An example user device according to an embodiment of the present disclosure is shown. Figure 3 The embodiment of UE 116 shown in FIG. 1 is for illustration only, and Figure 1 UEs 111 115 and 117 119 may have the same or similar configurations. However, UEs may appear in a variety of configurations, and Figure 3 The scope of the present disclosure is not limited to any particular implementation of the UE.

[0052] like Figure 3 As shown in FIG. 1 , UE 116 includes an antenna 301, a radio frequency (RF) transceiver 302, a TX processing circuit 303, a microphone 304, and a receive (RX) processing circuit 305. UE 116 also includes a speaker 306, a controller or processor 307, an input / output (I / O) interface (IF) 308, an input device 309, a touch screen display 310, and a memory 311. The memory 311 includes an OS 312 and one or more applications 313.

[0053] RF transceiver 302 receives incoming RF signals transmitted by a gNB of network 100 from antenna 301. RF transceiver 302 downconverts the incoming RF signals to generate an IF or baseband signal. The IF or baseband signal is sent to RX processing circuitry 305, which generates a processed baseband signal by filtering, decoding, and / or digitizing the baseband or IF signal. RX processing circuitry 305 sends the processed baseband signal to speaker 306 (such as for voice data) or processor 307 for further processing (such as for web browsing data).

[0054] The TX processing circuit 303 receives analog or digital voice data from the microphone 304 or other outgoing baseband data (such as web data, email, or interactive video game data) from the processor 307. The TX processing circuit 303 encodes, multiplexes, and / or digitizes the outgoing baseband data to generate a processed baseband or IF signal. The RF transceiver 302 receives the outgoing processed baseband or IF signal from the TX processing circuit 303 and up-converts the baseband or IF signal to an RF signal that is transmitted via the antenna 301.

[0055] The processor 307 may include one or more processors or other processing devices and executes the OS 312 stored in the memory 311 to control the overall operation of the UE 116. For example, the processor 307 may control the reception of forward channel signals and the transmission of reverse channel signals by the RF transceiver 302, the RX processing circuit 305, and the TX processing circuit 303 according to well-known principles. In some embodiments, the processor 307 includes at least one microprocessor or microcontroller.

[0056] The processor 307 is also capable of executing other processes and programs located in the memory 311, such as a process for CSI (Channel State Information) reporting on the uplink channel. The processor 307 can move data into or out of the memory 311 as needed to execute the process. In some embodiments, the processor 307 is configured to execute the application 313 based on the OS 312 or in response to a signal received from the gNB or operator. The processor 307 is also coupled to the I / O interface 308, which provides the UE 116 with the ability to connect to other devices such as laptops and portable computers. The I / O interface 308 is the communication path between these accessories and the processor 307.

[0057] Processor 307 is also connected to touch screen display 310. A user of UE 116 may use touch screen display 310 to enter data into UE 116. Touch screen display 310 may be a liquid crystal display, light emitting diode display, or other display capable of rendering text and / or at least limited graphics, such as from a website.

[0058] The memory 311 is connected to the processor 307. A portion of the memory 311 may include RAM, and another portion of the memory 311 may include flash memory or other ROM.

[0059] although Figure 3 An example of UE 116 is shown, but the Figure 3 Make various changes. For example, Figure 3 The various components in the embodiment may be combined, further subdivided, or omitted, and additional components may be added as required. As a specific example, processor 307 may be divided into multiple processors, such as one or more central processing units (CPUs) and one or more graphics processing units (GPUs). Furthermore, although Figure 3 The UE 116 is shown configured as a mobile phone or smart phone, but the UE may be configured to operate as other types of mobile or stationary devices.

[0060] How to improve the spectrum utilization of communication systems has always been a hot topic for practitioners. In recent years, as the working frequency bands of communication systems have been moving more and more towards high frequencies, communication systems will inevitably conflict with high-frequency radar systems. However, both in terms of background theoretical knowledge and hardware structure, communication systems and radar systems have very high similarities. Therefore, in theory, the two seemingly independent systems can be integrated to achieve functional enhancement of the communication system and improvement of spectrum efficiency, achieving a mutually beneficial and win-win effect. Therefore, Integrated Sensing And Communications (ISAC) is a hot research direction in the field of communications and is also one of the candidate technologies for 6G. The core purpose of the integrated communication and perception system is to use the same set of hardware equipment to achieve the perception function of the surrounding environment at the cost of as little resource overhead as possible while ensuring basic communication functions. The perceived content includes the distance, direction, speed and even type of objects in the surrounding environment. Different from the technology of locating access terminals in traditional communication systems, integrated communication perception technology can also perceive a variety of information of non-access objects, which greatly enhances the ability of the communication system to dynamically adjust the working status (scheduling, beam management, early warning of access terminals, etc.) according to the surrounding environment.

[0061] In order to realize the perception function on the basis of ensuring communication performance, the signal used in the communication perception integration technology should have both communication and perception functions. The communication function here means that this signal can be used for frequency domain channel estimation, so as to assist data demodulation. In the communication system, in order to reduce the probability of deep fading of each subcarrier, the reference signal will be designed as a signal with constant amplitude in the frequency domain. However, in order to improve the perception range and reduce signal distortion, the reference signal with perception function is preferably a constant amplitude signal in the time domain, that is, the peak to average power ratio (PAPR) is 0dB, which results in that whether it is the linear frequency modulation signal commonly used in radar or other constant amplitude signals, the spectrum amplitude will not be strictly constant amplitude, and the difference between the highest power and the lowest power can reach more than 4dB, which makes the reference signal with perception function can also be used for channel estimation, but the reliability of its channel estimation will be reduced. Therefore, how to make the reference signal in the communication perception integration technology have both channel estimation and perception capabilities, and further improve the channel estimation capability of the signal to better meet the needs of communication perception integration is one of the technical problems that need to be solved.

[0062] In order to solve or improve one or more of the existing problems, the embodiments of the present disclosure provide a communication method (a method performed by a first node / a second node in a wireless communication system) and a corresponding node. The method can perform additional processing on the signal so that the spectrum of the processed signal is constant amplitude and has a sufficiently low peak-to-average power ratio. Channel estimation based on the processed signal can effectively improve the channel estimation result.

[0063] The method provided by the embodiments of the present disclosure can be executed by any electronic device / node. For example, the node can be a user device in a wireless communication system or a network node, wherein the network node can be a base station or other network nodes (such as a transmission / receiving point TRP).

[0064] It should be noted that some of the terms involved in the embodiments of the present disclosure may adopt the terms that already exist in the communication standards, and some of the terms may be newly added or newly defined terms. The names of these newly added or newly defined terms may also adopt other names in future communication standards, or may be described in other ways (such as a text description). The names or names of the various information / messages / parameters / configurations involved in the embodiments of the present disclosure are not unique. As long as the role of the information / message / parameter / configuration, the content contained, or the description or description of the information / message / parameter / configuration can correspond or be associated, the name or name of the information / message / parameter / configuration can be changed. For example, the configuration information in the embodiments of the present disclosure may also be referred to as the first message or other message or signal configuration information, the first information may also be indication information, the information related to sequence generation may also be referred to as sequence information, the second information may also be referred to as resource information, the resource information may be frequency domain resource information and / or time domain resource information, and the first signal may also be referred to as a perception signal, a channel estimation signal, a physical signal or other names.

[0065] The technical scheme provided by the present disclosure and the technical effects produced by the technical scheme are explained below through the description of a variety of optional implementation methods. In the absence of conflicts or contradictions, the following implementation methods can refer to, draw on or combine with each other, and the same terms, similar features and similar implementation steps in different implementation methods will not be described repeatedly. For the interaction steps between different nodes, it is possible to derive the corresponding scheme of the network node on the other side based on the description of the scheme for the network node on one side. For example, if a network node receives configuration information from another network node, it can be concluded that the other network node sends configuration information to the above-mentioned network node. In an embodiment including multiple steps, if there is no clear order of sequence for the multiple steps, the embodiment of the present disclosure does not make a unique limitation on the implementation order of the multiple steps.

[0066] The following further describes the optional implementation methods of the method provided by the present disclosure in combination with the principles of the solution provided by the present disclosure and several optional embodiments. The steps of different embodiments can be combined or replaced with each other without conflict.

[0067] Figure 4 A method performed by a first node in a wireless communication system provided by an embodiment of the present disclosure is shown. The first node is a receiving node / receiver. Optionally, the first node may be a user equipment. The first node may also be an intermediate node in the communication system, such as a relay node in a relay network. Figure 4 As shown, the method may include:

[0068] Step S410: receiving a first signal;

[0069] Step S420: Determine whether the first signal is a power-normalized signal.

[0070] Step S430: when the first signal is a power-normalized signal, use the first method to perform channel estimation based on the first signal; when the first signal is a signal that has not been power-normalized, use the second method to perform channel estimation based on the first signal.

[0071] In an embodiment of the present disclosure, a first signal is sent by a second node (which may be called a transmitter) to a first node, wherein the first signal may be a physical signal generated by the second node using a time domain resource mapping method. Optionally, the second node may generate a first sequence, map the first sequence to a time domain resource to obtain a second signal, may use the second signal as the first signal, or may power normalize the second signal to obtain the first signal.

[0072] In the embodiment of this formula, based on the first signal, environmental perception can be performed (the perceived content may include but is not limited to physical distance, direction, speed, type, etc. in the environment), and / or channel estimation can be performed, that is, the first signal can be used as a perception signal or as a reference signal.

[0073] For the convenience of description, in the embodiment of the present disclosure, the first signal may also be referred to as a received physical signal, and the third signal generated by the first node hereinafter may also be referred to as a local physical signal.

[0074] Optionally, the first signal can be used for channel estimation, and the first node can generate a local physical signal according to the configuration of the second node (such as a base station), and perform channel estimation based on the local physical signal and the received physical signal. Both the local physical signal and the received physical signal are generated through time domain resource mapping.

[0075] In the embodiments of the present disclosure, signal power normalization, which may also be referred to as signal power standardization or signal scaling, refers to normalizing the power of a signal, that is, scaling the signal, which may be the scaling of the signal amplitude (the amplitude of the signal in the frequency domain). Signal power normalization can enable different modulation methods to obtain the same average power.

[0076] Optionally, power normalization may be power normalization at a subcarrier level, that is, power normalization is performed on signals on resource elements.

[0077] By adopting this scheme, the signal amplitude of the received physical signal (i.e., the power-normalized signal generated by the second node) on all subcarriers can be the same (i.e., the signal amplitude of the normalized signal on each subcarrier within the signal bandwidth is the same), and the signal amplitude on individual subcarriers will not be low. This effectively reduces the probability of deep fading of the signal on individual subcarriers, which is beneficial to the accuracy of channel estimation.

[0078] In the disclosed embodiment, when the first node needs to perform channel estimation, it can determine whether to perform power normalization on the local physical signal when performing channel estimation by knowing whether the received physical signal is a power-normalized signal, so that the received physical signal that has not been power normalized and the local physical signal that has not been power normalized can be used for channel estimation, or the received physical signal that has been power normalized and the local physical signal that has been power normalized can be used for channel estimation to ensure the accuracy of the channel estimation result. In other words, whether the received physical signal has been power normalized will affect the subsequent operation of the first node.

[0079] The specific method for the first node to learn whether the received signal has been power normalized is not limited in the embodiment of the present disclosure. As an optional solution, the first node may explicitly learn whether the received signal has been power normalized, and the solution may include:

[0080] Receive first information, where the first information is used to indicate whether the received signal is a power-normalized signal; and determine whether the first signal is a power-normalized signal based on the first information.

[0081] In this scheme, the first information may be explicit indication information, which may be called power normalization indication information, indicating that the received signal is a power-normalized signal, or indicating that the received signal is a signal that is not power-normalized. The embodiment of the present application does not limit the form of the power normalization indication information. For example, the signal transmitter / transmitter may send configuration information to the first node before or when sending the first signal, and the configuration information may include power normalization indication information. For example, the power normalization indication information may occupy 1 bit in the configuration information, and the value of the bit is 1, indicating that power normalization is performed, and the value of the bit is 0, indicating that power normalization is not performed. Alternatively, the configuration information may be resource configuration information, for example, resource configuration information related to generating a local physical signal, and the power normalization indication information may be a newly added field in the configuration information, or may be an existing field in the resource configuration information, and the field may be redefined or reused as power normalization indication information. As an optional method, the first information may be cyclic prefix indication information. If the indication information indicates that the received physical signal is a signal with a cyclic prefix, it indicates that the signal is a power-normalized signal. Otherwise, the signal is not a power-normalized signal.

[0082] Optionally, the power normalization indication information can be non-periodic, semi-static, or periodic. That is to say, the timeliness of the power normalization indication information can be configured as needed. For example, the power normalization indication information can be only applicable to the currently received physical signal, i.e., the above-mentioned first signal, or the first information can be applicable to signals (including the above-mentioned first signal) received within a longer period of time (e.g., several time slots), and the power normalization indication information can be used to determine whether the signal for channel estimation received within the longer period of time (e.g., within several time slots after receiving the power normalization indication information) is a normalized signal, or the first information is periodically valid.

[0083] Among them, the embodiment of the present disclosure does not limit the specific configuration method of the first information. Optionally, the first information can be obtained from physical layer signaling, from MAC (Media Access Control) layer signaling, or from high-level signaling.

[0084] Optionally, the first node may also determine whether the received physical signal is a power-normalized signal in an implicit manner. For example, the first node may determine based on information agreed upon by the protocol and related to determining whether the signal is power-normalized. As an optional solution, the above determination of whether the first signal is a power-normalized signal may include:

[0085] Determining whether the received signal is a power-normalized signal based on at least one of the following:

[0086] Whether there is data to be received within the time unit (such as time slot) where the first signal is located;

[0087] Whether a demodulation reference signal is configured within the time unit where the first signal is located;

[0088] A comparison result of a bandwidth of a demodulation reference signal configured in a time slot where the first signal is located and a bandwidth of the first signal;

[0089] Whether the data received in the time slot where the first signal is located is multi-port transmission data.

[0090] In this optional solution, the first node can determine whether the first signal is a power-normalized signal according to whether there is data or signal to be received in the time unit where the first signal is located. In this way, the first node can implicitly determine whether the first signal is power-normalized by performing the above-mentioned judgment operation.

[0091] In the disclosed embodiment, optionally, if there is data or signal that needs to be demodulated within the time unit where the first signal is located, the first node needs a more accurate channel estimation result. Therefore, in order to improve the accuracy of the channel estimation, the signal used for channel estimation should be horizontal in the frequency domain. Such a signal can better meet the communication requirements. The first signal should use a signal that has been power normalized in the frequency domain. Based on this, the first node can assume whether the received first signal has been power normalized based on whether there is data and / or signal to be received within the time unit where the received signal is located. For example, if there is data to be received within the time unit and a demodulation reference signal is configured, the first node should assume that the channel estimation result is to be used for subsequent signal demodulation, and the quality of the channel estimation can affect the signal demodulation, and then affect the quality of the communication system. At this time, the first node should assume that the received signal (including the above-mentioned first signal) is a power-normalized signal.

[0092] Optionally, the first node determines that the received signal is a power-normalized signal when determining that at least one of the following is satisfied:

[0093] There is data that needs to be received within the time unit where the first signal is located;

[0094] A demodulation reference signal is configured within the time unit where the first signal is located;

[0095] The bandwidth of the demodulation reference signal configured in the time unit where the first signal is located is not greater than the bandwidth of the first signal;

[0096] The data received in the time unit where the first signal is located is not the data of the multi-port transmission.

[0097] In the embodiment of the present disclosure, the granularity / unit of the time unit is not limited in the embodiment of the present disclosure. The time domain resource occupied by the first signal is a subunit in the time unit where the first signal is located. For example, a time unit can be a time slot or a time unit of other granularity, and the subunit can be an OFDM symbol. For example, the first signal is sent by the second node on a certain symbol or symbols in time slot 1, and the time unit where the first signal received by the first node is located is time slot 1. If the first node determines that at least one of the following conditions is met: there is data to be received on other symbols in time slot 1, a demodulation reference signal is configured in time slot 1, the bandwidth of the demodulation reference signal is less than or equal to the bandwidth of the first signal, or the data received in time slot 1 is not multi-port transmitted data, the first node should assume that the first signal sent by the second node is a power-normalized signal. For example, when all of the above four items are met, the first node believes that the received first signal is a power-normalized signal. Optionally, the first node can receive DCI (Downlink Control Information) and determine whether at least one of the above four items is met based on the DCI.

[0098] In an optional embodiment of the present disclosure, the first node should assume that the first signal is obtained based on the second signal, wherein the second signal is generated by mapping the second sequence to time domain resources, and when the first signal is a signal that is not power-normalized, the first signal is the second signal, and when the first signal is a power-normalized signal, the first signal is obtained by power-normalizing the second signal.

[0099] That is, the first node should assume that the second node generates the first signal in the following manner:

[0100] Mapping the first sequence to time domain resources to obtain a second signal;

[0101] When the first signal is not a power-normalized signal, the second signal is used as the first signal. When the first signal is a power-normalized signal, the first signal is obtained by performing power normalization processing on the second signal.

[0102] The embodiments of the present disclosure do not limit the form of the sequence used to generate the second signal, and the sequence may include but is not limited to a Chirp sequence or a chaotic frequency modulation sequence. It is understandable that the second signal and the local physical signal should be generated by the same signal generation method. If the first signal is a power-normalized signal, after the second signal is generated by mapping the first sequence to time domain resources, the second signal needs to be power normalized. If the first signal is not power-normalized, the second signal is directly used as the first signal. By mapping the first sequence to the time domain to generate a physical signal, rather than mapping the resources in the frequency domain and then obtaining it through an inverse Fourier transform, the generated time domain signal can have a lower PAPR, is not easily affected by nonlinear factors, and can better meet communication needs.

[0103] Among them, the first sequence can be pre-generated by the second node, or it can be generated in real time, and the second signal can be a physical signal generated in advance, or it can be generated in real time. For example, the second node (such as a base station, or a relay node according to the configuration of the base station) can determine the resources actually occupied by the first signal to be generated, and the resources may include time domain resources and / or frequency domain resources. The second node maps the first sequence to the resources actually occupied by the first signal to be generated to obtain the second signal. If it is determined that signal power normalization is to be performed, the second signal is subjected to signal scaling processing to obtain a power-normalized first signal. If power normalization is not performed, the second signal is used as the first signal that has not been power normalized.

[0104] In order to perform channel estimation, the second node can send resource configuration information related to the resources actually occupied by the first signal to the first node. Based on the resource configuration information, the first node can receive the first signal sent by the second node on the resources actually occupied by the first signal. Correspondingly, the first node can generate a local sequence (second sequence), map the local sequence to the time domain resources actually occupied by the first signal, obtain a local physical signal, and thus perform channel estimation based on the local physical signal and the received physical signal.

[0105] In the disclosed embodiment, the resources configured to the first node may include time domain resources and frequency domain resources, and the time domain resources and frequency domain resources may be configured to the user equipment together or separately. Information related to the generation of a local physical signal may include at least one of information related to the generation of a local sequence and information related to the time domain resources actually occupied by the first signal, and these two pieces of information may be configured simultaneously or separately. For example, the base station may first configure the user equipment with information related to the generation of a local sequence, and then configure the user equipment with information related to the time domain resources actually occupied by the first signal when it is necessary to send the first signal to the user equipment.

[0106] Optionally, the resources configured in the above resource configuration information may be resources actually occupied by the first signal, or the resource configuration information includes relevant information of the resources (total resources) configured for the first node, and relevant information for determining the resources actually occupied by the first signal from the resources configured for the first node (such as information related to resources that cannot be occupied by the first signal, or information related to resources actually occupied by the first signal). In this case, the resources actually occupied by the first signal are a subset of the total resources.

[0107] In the embodiment of the present disclosure, when the first node determines that the received signal is a power-normalized signal, the first node should assume that the first signal is obtained by performing an inverse Fourier transform on the second frequency domain signal, the second frequency domain signal is obtained by performing power normalization on the first frequency domain signal, and the first frequency domain signal is obtained by performing a Fourier transform on the second signal.

[0108] Since the second signal is a time domain signal and the signal power normalization operation is performed in the frequency domain, when the second node generates the power-normalized first signal, it is necessary to first perform a time-frequency transform, i.e., a Fourier transform, on the second signal to obtain a first frequency domain signal, and then perform power normalization processing on the first frequency domain signal. The normalized second frequency signal is then subjected to an inverse Fourier transform to obtain the first signal with signal power normalization.

[0109] The specific method of power normalization processing of the first frequency domain signal is not limited by the embodiment of the present disclosure. Optionally, the first frequency domain signal can be normalized by scaling the signal amplitude according to the signal scaling factor, and the signal scaling factor can be a coefficient related to the second signal, such as the signal scaling factor can be determined based on the information of the second signal itself, or the signal scaling factor can be determined based on other methods. For example, the power normalization processing of the first frequency domain signal can be performed based on at least one of the following:

[0110] The first coefficient β; the length N of the sequence for generating the second signal, that is, the number of elements in the first sequence; and parameters related to the windowing process.

[0111] Wherein, β is associated with the transmit power of the first signal. When the second node generates the second signal, after mapping the first sequence to the time domain resource to generate the time domain signal, the signal may be scaled using the scaling factor β to meet the transmit power requirement of the signal. Based on this, when the first signal is obtained based on the second signal, because the average power of the signal is unchanged, the normalization processing of the signal may be related to the power scaling factor β.

[0112] Since the second signal is generated by mapping the first sequence to the time domain resources, the length of the sequence (that is, the number of elements in the sequence) used to generate the second sequence determines the number of sample points of the signal to be actually sent, and therefore, the power normalization processing of the signal may also be related to the length of the sequence. In addition, if the signal is windowed when the first signal is generated, the power normalization processing method may also be related to the above parameters related to the windowing processing, such as the size of the window or other parameters.

[0113] Optionally, the first frequency domain signal and / or the second frequency domain signal satisfies at least one of the following:

[0114] The first frequency domain signal and the second frequency domain signal have the same bandwidth;

[0115] The first frequency domain signal and the second frequency domain signal occupy the same subcarrier;

[0116] The signal amplitude of each subcarrier within the bandwidth of the second frequency domain signal is the same;

[0117] The signal amplitude of the second frequency domain signal is a first value, and the first value is determined based on the signal amplitudes of all subcarriers of the first frequency domain signal within its bandwidth;

[0118] The second frequency domain signal and the first frequency domain signal have the same signal phase on the same subcarrier;

[0119] The signal amplitude of the second frequency domain signal on the subcarrier outside its bandwidth is a second value;

[0120] The signal phase of the second frequency domain signal on the subcarrier outside its bandwidth is a third value;

[0121] The signal amplitude and signal behavior of the second frequency domain signal on the subcarriers outside its bandwidth are both zero.

[0122] The first value may be directly calculated based on the signal amplitude of the first frequency domain signal on all subcarriers, or may be obtained by other means. Optionally, the first value may be equal to the arithmetic mean of the signal amplitude of the first frequency domain signal on all subcarriers within its bandwidth.

[0123] In the disclosed embodiment, the signal amplitude and signal phase of the normalized second frequency domain signal on the subcarriers outside its bandwidth can be any values, that is, the second value and the third value can be any values, because the subcarriers outside the bandwidth will not affect the first signal finally obtained. Optionally, the second value and the third value can both be 0. Among them, keeping the signal amplitudes of the second frequency domain signal on all subcarriers within the bandwidth equal so that the first signal is horizontal in the frequency domain can be beneficial to channel estimation. By adopting the scheme of retaining the original phase before normalization, although the peak-to-average power ratio of the first signal in the time domain may be deteriorated, the degree of deterioration is relatively small, and the nonlinear interference in the first signal will not be significantly increased.

[0124] Optionally, if it is determined that the first signal is a power-normalized signal, the first node also needs to power-normalize the generated local physical signal when performing channel estimation, first perform Fourier transform on the local physical signal, power-normalize the transformed frequency domain signal, and calculate the channel estimation result based on the normalized frequency domain signal and the time-frequency transform result of the received physical signal. Among them, when the first node performs power normalization on the frequency domain signal corresponding to the local physical signal, optionally, the amplitude of the power-normalized frequency domain signal can be obtained by the first node by calculating the signal amplitude of the frequency domain signal on all subcarriers. Optionally, the second node can also notify the first node of the corresponding power normalization coefficient, and the first node scales the amplitude of the frequency domain signal before normalization based on the coefficient to obtain the normalized amplitude.

[0125] As an optional solution, the second frequency domain signal is obtained by remapping the signals on the subcarriers within the signal bandwidth in the first frequency signal after power normalization to the corresponding subcarriers.

[0126] Optionally, the signals (amplitude of the signals) on each subcarrier within the bandwidth of the physical signal can be taken out from the first frequency signal to form a sequence a, and a sequence b can be obtained based on sequence a, wherein the amplitude of each element in sequence b is equal to the square root of the arithmetic mean of the squares of the amplitudes of all elements in sequence a, and the phase of any element of sequence b is the same as the phase sequence of the corresponding element in the second sequence. After obtaining sequence b, sequence b can be re-mapped to each subcarrier within the bandwidth of the physical signal in order (to obtain a second frequency domain signal) and an inverse Fourier transform can be performed to obtain the first signal.

[0127] Based on the above scheme provided by the embodiment of the present disclosure, a signal after power normalization at the subcarrier level can be obtained. If the first signal is used for channel estimation, if the first signal is a power-normalized signal, the second node must notify the first node whether the first signal sent by the first node is power normalized during generation, or the first node must determine whether the received first signal is a power-normalized signal based on relevant information, because whether normalization is performed will affect the subsequent operation of the first node.

[0128] In the embodiment of the present disclosure, for a channel estimation scenario, performing channel estimation includes:

[0129] generating a third signal;

[0130] Channel estimation is performed based on the first signal and the third signal.

[0131] The channel estimation is performed based on the first signal and the third signal, including:

[0132] Performing Fourier transform on the first signal to obtain a third frequency domain signal;

[0133] Performing Fourier transform on the third signal to obtain a fourth frequency domain signal;

[0134] When it is determined that the first signal is a signal that has not been power normalized, performing channel estimation based on the third frequency domain signal and the fourth frequency domain signal;

[0135] When it is determined that the first signal is a power-normalized signal, the fourth frequency domain signal is power-normalized to obtain a fifth frequency domain signal, and channel estimation is performed based on the fifth frequency domain signal and the third frequency domain signal.

[0136] Among them, the third signal can be called a local physical signal, which is generated by the first node by mapping the second sequence to time domain resources. If the first node learns that the received signal has not been power normalized, the first node can directly perform channel estimation based on the local physical signal and the first signal. For example, the channel estimation result can be obtained by calculating the ratio of the signal amplitudes of the local physical signal and the first signal in the frequency domain. If the first node learns that the received signal has been power normalized, the first node needs to perform power normalization processing on the local physical signal, and perform channel estimation based on the power normalized signal and the first signal.

[0137] It can be understood that the first node should generate the local physical signal in the same manner as the second node generates the second signal.

[0138] Optionally, the first node may obtain second information related to generating the third signal, and generate the third signal based on the second information. The second information related to generating the signal may include third information related to generating the second sequence, and fourth information related to resources actually occupied by the signal. The first node may generate the second sequence based on the third information, and map the second sequence to time domain resources based on the fourth information to obtain the third signal.

[0139] In the embodiment of the present disclosure, the fourth information may include information related to the time domain resources actually occupied by the signal, and may also include frequency domain resources. The first node may map the second sequence to the time domain resources based on the time domain resources actually occupied by the third signal to obtain the third signal. It is understandable that the resources actually occupied by the third signal are the same as the resources actually occupied by the first signal.

[0140] The third information and the fourth information may be configured simultaneously or separately. If the first node determines whether the received physical signal is a normalized signal based on the power normalization indication information, the power normalization indication information and the fourth information may be configured simultaneously or separately. Optionally, the method may include:

[0141] Configuration information is received, where the configuration information includes resource configuration information and power normalization indication information.

[0142] Optionally, in the embodiment of the present disclosure, in the channel estimation scenario, the first signal may be a signal with a cyclic prefix by default. Of course, the second node may also send corresponding indication information to the first node, and use the indication information to notify the first node whether the first signal it receives has a cyclic prefix.

[0143] After obtaining the third information and the fourth information, the first node can generate a second sequence for generating a local physical signal based on the third information. The first node can at least determine the time domain resources actually occupied by the first signal according to the fourth information, and generate a local physical signal, i.e., a third signal, by mapping the second sequence to the time domain resources. When performing channel estimation, if the first node determines that the received physical signal is a power-normalized signal, the first node will perform power normalization processing on the third signal.

[0144] As an implementation of the present disclosure, the method may include:

[0145] receiving information related to generation of a third signal and power normalization indication information;

[0146] receiving a first signal;

[0147] generating a third signal based on information related to generation of the third signal;

[0148] Performing time-frequency transformation on the first signal to obtain a third frequency domain signal;

[0149] Performing time-frequency transformation on the third signal to obtain a fourth frequency domain signal;

[0150] If it is determined based on the power normalization indication information that the first signal is not a power-normalized signal, performing channel estimation based on the third frequency domain signal and the fourth frequency domain signal;

[0151] If it is determined based on the power normalization indication information that the first signal is a power normalized signal, the fourth frequency domain signal is power normalized to obtain a fifth frequency domain signal, and channel estimation is performed based on the fifth frequency domain signal and the third frequency domain signal. For example, the signal on each subcarrier of the fifth frequency domain signal within the signal bandwidth is divided by the signal on the corresponding subcarrier of the third frequency domain signal to obtain the frequency domain channel value on each subcarrier.

[0152] Among them, the first node normalizes the power of the fourth frequency domain signal to obtain the fifth frequency domain signal. The method of normalizing the signal power of the first frequency domain signal to the second frequency domain signal described in the previous article can be referred to, and will not be repeated here.

[0153] The present disclosure also provides an optional communication method, which may be performed by a second node in a communication system, and includes:

[0154] Sending a first signal, wherein the first signal is a power-normalized signal or a signal that is not power-normalized;

[0155] If the first signal is a power-normalized signal, the first signal is used to perform channel estimation using a first method; if the first signal is a signal that is not power-normalized, the first signal is used to perform channel estimation using a second method.

[0156] The second node may be a transmitting node / transmitter, such as a base station, and the transmitter sends a first signal for channel estimation to the receiver. The receiver may generate a local physical signal based on the received second information, and perform channel estimation based on the received first signal and the local physical signal. The receiver may perform channel estimation in different ways depending on whether the first signal is a power-normalized signal.

[0157] Optionally, the method further includes:

[0158] First information is sent, where the first information is used to indicate whether the sent signal is a power-normalized signal.

[0159] The method performed by the second node corresponds to the method performed by the first node in the above text, except that one is described from the perspective of the transmitter and the other is described from the perspective of the receiver. For other optional implementations of the method performed by the second node, reference can be made to the corresponding description in the above embodiments, which will not be repeated here.

[0160] In order to better illustrate the solution provided by the present disclosure, the solution is described in more detail below in combination with a variety of specific embodiments. The following describes some embodiments provided by the present disclosure by taking the first node as the execution subject as an example. It can be understood that the steps involved in these embodiments can also be described with the second node as the execution subject. For example, the first node receives information, which can be described as the second node sending information. For another example, the first node should assume that the first signal is generated in the following manner. Since the first signal is sent by the second node, it can be described accordingly as: the second node generates the first signal in the following manner.

[0161] The solution proposed in the embodiment of the present disclosure can make the signal have the advantages of very low peak-to-average power ratio and the lowest probability of deep fading, which can better meet the signal requirements of the integrated communication and perception system.

[0162] It should be noted that, in actual implementation, some steps in the following embodiments may be omitted or replaced by other methods that can achieve the same purpose. For example, the method for generating a sequence for generating a physical signal is not limited in this disclosure, and the acquisition or configuration of information for generating a local sequence, resources actually occupied by the signal, and other information is not limited in this disclosure, and the methods given in the embodiments of this disclosure may be adopted but are not limited to them.

[0163] As an optional embodiment, Figure 5 A schematic diagram of a process flow of a method performed by a first node provided in the present application is shown, such as Figure 5 As shown, the method may include the following steps:

[0164] S510: Acquire configuration information of a physical signal;

[0165] S520: Receive a physical signal (first signal) according to the configuration information;

[0166] S530: Generate a local physical signal in the time domain according to the configuration information;

[0167] S540: Perform channel estimation according to the received physical signal and the local physical signal.

[0168] The above configuration information may include at least one of the following:

[0169] Sequence information related to the sequence used to generate the physical signal (it can be understood that the sequence information can be interpreted as information related to the generation of the first sequence, and can also be interpreted as information related to the generation of the second sequence); resource information related to the time-frequency resources allocated to the physical signal (similarly, the resource information here can be interpreted as resource information corresponding to the local physical signal, and can also be interpreted as resource information corresponding to the received physical signal); first information.

[0170] Optionally, the above configuration information may include first information, which is power normalization indication information, and the power normalization indication information is used to indicate whether power normalization is performed on signal pairs on each resource element within the signal bandwidth during the generation process of the received signal.

[0171] Optionally, the configuration information may not include the first information. Optionally, when all of the following conditions are met, the first node assumes that the signal power of the received physical signal on each resource element is normalized during its generation process, otherwise the first node should assume that the received physical signal is not normalized during its generation process:

[0172] ① The first node needs to receive data in the time slot where the physical signal is located;

[0173] ② The first node is configured with a demodulation reference signal in the time slot where the physical signal is located;

[0174] ③The bandwidth of the configured demodulation reference signal is not greater than the bandwidth of the physical signal;

[0175] ④ The data received by the first node in the time slot where the physical signal is located is not multi-port transmitted, or the physical signal is not multi-port transmitted.

[0176] Based on the configuration of the second node, the first node can receive the physical signal sent by the base station on the transmission resource corresponding to the physical signal. As shown in step S520, the above configuration information may include resource information related to the time domain resources and / or frequency domain resources allocated for the physical signal. The first node can receive the physical signal on the corresponding resource based on the information in the configuration information. Accordingly, the first node can generate a local physical signal based on the configuration information, for example, generate a local sequence (second sequence) for generating a local physical signal according to the configuration information, and perform resource mapping on the local sequence in the time domain according to the resource information to obtain a local physical signal (third signal). The sequence type / form of the local sequence is not limited in the embodiments of the present disclosure.

[0177] After generating the local physical signal, the first node may perform channel estimation based on the local physical signal and the received physical signal. Optionally, performing signal estimation may include:

[0178] Perform Fourier transform on the local physical signal to obtain a fourth frequency domain signal; obtain a fifth frequency domain signal from the fourth frequency domain signal according to the first information (power normalization indication information); and perform channel estimation based on the received physical signal and the fifth frequency domain signal.

[0179] Among them, the power normalization indication information indicates that the power normalization of each resource element is not performed on the received physical signal during its generation process, then the fifth frequency domain signal is the fourth frequency domain signal, and if the first information indicates that the received physical signal is power normalized, the fifth frequency domain signal with the same bandwidth and occupying the same subcarrier can be generated by the fourth frequency domain signal. Optionally, the signal amplitude of the fourth frequency domain signal on each subcarrier within its bandwidth is the same, and the amplitude is the square root of the arithmetic mean of the square of the signal amplitude of the third frequency domain signal on all subcarriers within its bandwidth, and the signal phase of the fourth frequency domain signal on each subcarrier within its bandwidth is the same as the signal phase of the third frequency domain signal on the same subcarrier. That is, the frequency domain resources occupied by the third frequency domain signal and the fourth frequency domain signal before and after normalization, and the signal phase on the same subcarrier are unchanged. In addition, the signal amplitude and signal phase of the fourth frequency domain signal on each subcarrier outside its bandwidth are not limited, and can all be zero.

[0180] The channel estimation based on the received physical signal and the fifth frequency domain signal may include: performing Fourier transform on the received physical signal to obtain the third frequency domain signal; dividing the third frequency domain signal on each subcarrier within the signal bandwidth and the fifth frequency domain signal on the corresponding subcarrier to obtain the frequency domain channel value on each subcarrier. That is, the local physical signal and the received physical signal are divided in the frequency domain to obtain the signal estimation result.

[0181] Although the embodiments of the present disclosure do not limit the sequences (first sequence, second sequence) used to generate physical signals, in order to more clearly illustrate the specific steps in the scheme provided in the embodiments of the present disclosure, the sequences used to generate physical signals in some of the following embodiments will be illustrated using the Chirp sequence as an example.

[0182] Optionally, the solution provided by the embodiment of the present disclosure may include at least some of the following steps 1 to 4.

[0183] Step 1: The first node obtains configuration information

[0184] Optionally, the configuration information may include resource information. The first node may directly or indirectly obtain parameters related to generating the physical signal and / or parameters related to the resources actually occupied by the physical signal from the resource information of the configuration information. Optionally, the parameters may include but are not limited to the following:

[0185] ① The subcarrier number k with the lowest frequency in the bandwidth allocated to the physical signal start ;

[0186] ② is the subcarrier number k with the highest frequency within the bandwidth allocated to the physical signal end ;

[0187] ③ The sequence number l of the OFDM symbol assigned to the physical signal in the time slot 0 ;

[0188] ④ The number of time domain samples N allocated to the physical signal;

[0189] ⑤ The serial number D of the sample point where the first element of the physical signal is located in the OFDM symbol start (It can also be considered as an offset.) D start =0 is the first sample point in an OFDM symbol except the cyclic prefix.

[0190] Among them, k start and k end They respectively represent the index of the lowest subcarrier (minimum index number) and the index of the highest subcarrier (maximum index number) actually occupied by the physical signal, that is, the minimum index number and the maximum index number of the subcarrier actually occupied. start and k end The number of subcarriers actually occupied by the physical signal can be determined.

[0191] l 0 Indicates the index of the OFDM symbol actually occupied by the physical signal in the time slot, that is, the OFDM symbol index. According to the index, it can be determined that the physical signal is transmitted on the OFDM symbol.

[0192] The number of time domain samples N is the length of the sequence that generates the physical signal, that is, the number of elements in the sequence.

[0193] D start It is the index of the sample point of the first element of the physical signal actually sent in the first OFDM symbol actually occupied by the physical signal, and the physical signal starts to be sent at the time corresponding to the sample point.

[0194] The specific method of obtaining the various parameters listed above is not limited in the embodiment of the present disclosure, and can be directly indicated in the resource information, or can be indirectly inferred from other parameters. For example, if the sequence number p of the resource block with the lowest frequency in the bandwidth allocated to the physical signal can be obtained from the resource information, start , then k start Through k start =12p start Calculated; if the number of resource blocks M in the bandwidth allocated for the physical signal can be obtained from the resource information, then kend Through k end =k start +12M-1; if the time domain length of the physical signal, that is, the number of time domain samples N, is given as the ratio α of the length to the length of an OFDM symbol, then N can be calculated by N=[α·N FFT ] is calculated, where N FFT is the number of Fourier transform points, [·] rounded to the nearest integer; if the sample point where the first element of the physical signal is located is at the serial number D in the OFDM symbol start (i.e., the offset) is given as a proportion β of the length of an OFDM symbol, then N can be obtained by D start =[β·N FFT ] is calculated; l 0 It may be configured to the first node through configuration information, or it may be a value known by the first node by default.

[0195] Step 2: Receiving a Physical Signal

[0196] The first node receives the physical signal on the resource corresponding to the physical signal. The first node may know the resource actually occupied by the physical signal according to the resource information configured for the physical signal, and receive the physical signal on the resource. Optionally, the resource information may be configured to the first node by the second node through the configuration information of step 1, or may be configured to the first node by the second node using other configurations independent of the configuration information.

[0197] Optionally, taking the Chirp sequence as an example, the first node should assume that the received physical signal is generated in the following manner:

[0198] The first node should assume that the sequence s[n], i.e. the first sequence, is defined as:

[0199]

[0200] or

[0201]

[0202] Where N represents the length of the sequence, the value of n is the index of the element in the sequence, and n=0 represents the first element. FFT It is the number of inverse Fourier transform points and Fourier transform points, which are the parameters that must be obtained when the first node accesses the network.

[0203] Any one of the above two implementation methods can be adopted, and there is no essential difference between the two.

[0204] The first node shall assume that the sequence s[n] is mapped to the time domain resource to obtain the received physical signal. Optionally, for example, to meet the transmit power requirement, the first node shall assume that the sequence s[n] is scaled by a factor β to meet the transmit power requirement and is mapped to the lth node according to the following formula: 0 The Dth OFDM symbol start +n sample points:

[0205]

[0206] If the power normalization indication information indicates that the received physical signal does not perform signal power normalization on each resource element during its generation process, the first node shall assume that the physical signal is: x[n] = x noCP [(nN CP )modN FFT ], where mod represents the remainder operation, N CP is the number of points of the cyclic prefix.

[0207] If the power normalization indication information indicates that the received physical signal has undergone signal power normalization on each resource element during its generation process, the first node shall assume that the physical signal is generated as follows:

[0208] ① For x noCP [n] Carry out N FFT Point Fourier transform, get the first frequency domain signal X 1 [k],k=0,1,…,N FFT -1;

[0209] ②To X 1 [k] performs power normalization processing to obtain the second frequency domain signal X 2 [k];

[0210] Optional,

[0211]

[0212] in,

[0213] Where M = k end -k start +1 indicates the number of subcarriers within the signal bandwidth, that is, the number of subcarriers actually occupied by the physical signal.

[0214] ③To X 2 [k] Perform N FFT Point Fourier inverse transform to get x′ noCP [n], n = 0, 1, ..., N FFT -1;

[0215] ④Based on x′ noCP [n] obtains the physical signal x[n] = x' noCP [(nN CP )mod N FFT ], where mod represents the remainder operation.

[0216] The first node is at 0 All N OFDM symbols are received CP +N FFT The signal at the sample points and discard the first N CP data, only keep the last N FFT data, and obtain the received physical signal, recorded as y[n], n = 0, 1, ..., N FFT -1.

[0217] The signal processing method provided by the embodiment of the present disclosure has the following beneficial effects:

[0218] If power normalization is not performed, the physical signal sent by the second node can completely retain the original characteristics of the sequence, and the peak-to-average power ratio of the physical signal is very low, so that the physical signal can be sent at a higher power, thereby improving the signal-to-noise ratio; on the other hand, the very low peak-to-average power ratio can prevent the physical signal from being affected by the nonlinear characteristics of the power amplifier when passing through the power amplifier.

[0219] If power normalization is performed, the signal amplitude of the physical signal sent by the second node on all subcarriers can be the same, and the signal amplitude on individual subcarriers will not be low, which reduces the probability of deep fading on this subcarrier, which is beneficial to the accuracy of channel estimation. On the other hand, since the original phase is retained, although the peak-to-average power ratio of the physical signal in the time domain has deteriorated, the degree of deterioration is relatively small, and the nonlinear interference in the received physical signal will not be significantly increased.

[0220] As an example, Figure 6 and Figure 7 The schematic diagram shows the effect of physical signal changes in the frequency domain before and after power normalization. In this example, the normalized spectrum amplitude is adjusted to 1. Figure 6 It can be seen that after normalization, the physical signal is horizontal in the frequency domain. Figure 7 It can be seen that the PAPR of the signal (shown on the vertical axis) will be improved after normalization. Figure 7It can also be seen that if the physical signal is not power normalized, its PAPR will be very low, and the signal can have better perception capabilities. It can be seen that based on the solution provided by the embodiment of the present disclosure, it can be decided to perform power normalization or not on the physical signal according to the actual application scenario, and the physical signal can meet both perception requirements and communication requirements.

[0221] Step 3: Generate local physical signals in the time domain based on the configuration information

[0222] The order in which the first node receives the physical signal and the first node generates the physical signal is not limited in the embodiment of the present disclosure. Step 3 may include the following steps:

[0223] Step 3.1: Generate a local sequence for generating a local physical signal according to the configuration information.

[0224] Since this embodiment takes the Chirp sequence as an example, the first node may generate a local sequence in the following manner:

[0225]

[0226] or

[0227]

[0228] Any of the above two sequences can be sampled. There is no difference between the two. It only needs to use the same sequence generation method as the sending end.

[0229] Step 3.2: According to the resource information, perform resource mapping on the local sequence in the time domain to obtain a local physical signal.

[0230] Optionally, the local physical signal x can be obtained by local [n]:

[0231]

[0232] Step 4: Perform channel estimation based on the received physical signal and the local physical signal

[0233] This step 4 may include the following steps:

[0234] Step 4.1: Perform Fourier transform on the local physical signal to obtain the frequency domain signal

[0235] For local physical signal x local [n] Carry out N FFT Fourier transform of the point is used to obtain the local frequency domain signal, that is, the fourth frequency domain signal, which is recorded as X local,1 [k],k=0,1,…,N FFT -1.

[0236] Step 4.2: Generate a fifth frequency domain signal from the fourth frequency domain signal according to the power normalization indication information.

[0237] The specific method is:

[0238] (1) If the power normalization indication information indicates that the received physical signal has not been subjected to power normalization on each resource element during its generation process, the fifth frequency domain signal X local,2 [k] = X local,1 [k],k=0,1,…,N FFT -1.

[0239] (2) If the power normalization indication information indicates that the received physical signal has undergone power normalization on each resource element during its generation process, the method for generating the fifth frequency domain signal is:

[0240]

[0241] in,

[0242] Step 4.3: performing channel estimation according to the received physical signal and the fifth frequency domain signal. This step may include:

[0243] Step 4.3.1: Perform Fourier transform on the received physical signal y[n] to obtain a third frequency domain signal, denoted as Y[k], k = 0, 1, ..., N FFT -1;

[0244] Step 4.3.2: Perform signal processing on the third frequency domain signal on each subcarrier within the physical signal bandwidth and the fifth frequency domain signal on the corresponding subcarrier to obtain the frequency domain channel value on each subcarrier. The signal processing method includes but is not limited to:

[0245]

[0246] or

[0247]

[0248] in, For X local,2 The conjugate of [k].

[0249] The present disclosure also provides a node, which may include a transceiver and at least one processor coupled to the transceiver, and the at least one processor may execute the solution provided by any optional embodiment of the present disclosure. The node may be any electronic device, such as the electronic user device or a network node.

[0250] Optionally, the node may be a first node, and the at least one processor may be configured to execute any method performed by the first node provided in the embodiments of the present disclosure.

[0251] Optionally, the above-mentioned node may also be a second node, and the above-mentioned at least one processor may be configured to execute any method performed by the second node provided in the embodiments of the present disclosure.

[0252] An embodiment of the present disclosure also provides an electronic device, which includes at least one transceiver and at least one processor coupled to the at least one transceiver, and the at least one processor is configured to execute the method provided by any optional embodiment of the present disclosure.

[0253] Figure 8 A schematic diagram of the structure of an electronic device applicable to the embodiment of the present disclosure is shown in FIG. Figure 8 As shown, Figure 8 The electronic device 4000 shown includes: a processor 4001 and a memory 4003. The processor 4001 and the memory 4003 are connected, such as through a bus 4002. Optionally, the electronic device 4000 may also include a transceiver 4004, which may be used for data interaction between the electronic device and other electronic devices, such as data transmission and / or data reception. It should be noted that in actual applications, the transceiver 4004 is not limited to one, and the structure of the electronic device 4000 does not constitute a limitation on the embodiments of the present disclosure. Optionally, the electronic device may be a first network node, a second network node, or a third network node.

[0254] Processor 4001 may be a CPU (Central Processing Unit), a general-purpose processor, a DSP (Digital Signal Processor), an ASIC (Application Specific Integrated Circuit), an FPGA (Field Programmable Gate Array) or other programmable logic devices, transistor logic devices, hardware components or any combination thereof. It may implement or execute various exemplary logic blocks, modules and circuits described in conjunction with the present disclosure. Processor 4001 may also be a combination that implements computing functions, such as a combination of one or more microprocessors, a combination of a DSP and a microprocessor, etc.

[0255] The bus 4002 may include a path to transmit information between the above components. The bus 4002 may be a PCI (Peripheral Component Interconnect) bus or an EISA (Extended Industry Standard Architecture) bus. The bus 4002 may be divided into an address bus, a data bus, a control bus, etc. For ease of representation, Figure 8 Only one thick line is used in the diagram, but this does not mean that there is only one bus or only one type of bus.

[0256] The memory 4003 may be a ROM (Read Only Memory) or other types of static storage devices that can store static information and instructions, a RAM (Random Access Memory) or other types of dynamic storage devices that can store information and instructions, or an EEPROM (Electrically Erasable Programmable Read Only Memory), a CD-ROM (Compact Disc Read Only Memory) or other optical disk storage, optical disk storage (including compressed optical disk, laser disk, optical disk, digital versatile disk, Blu-ray disk, etc.), magnetic disk storage media, other magnetic storage devices, or any other medium that can be used to carry or store computer programs and can be read by a computer, without limitation herein.

[0257] The memory 4003 is used to store the computer program for executing the embodiment of the present disclosure, and the execution is controlled by the processor 4001. The processor 4001 is used to execute the computer program stored in the memory 4003 to implement the steps shown in the above method embodiment.

[0258] An embodiment of the present disclosure provides a computer-readable storage medium, on which a computer program is stored. When the computer program is executed by a processor, the steps and corresponding contents of the aforementioned method embodiment can be implemented.

[0259] The embodiments of the present disclosure also provide a computer program product, including a computer program, which can implement the steps and corresponding contents of the aforementioned method embodiments when executed by a processor.

[0260] The terms "first", "second", "third", "fourth", "1", "2", etc. (if any) in the specification and claims of the present disclosure and the above-mentioned drawings are used to distinguish similar objects, and are not necessarily used to describe a specific order or sequence. It should be understood that the numbers used in this way can be interchanged where appropriate, so that the embodiments of the present disclosure described herein can be implemented in an order other than that shown or described in the text.

[0261] It should be understood that, although the flowchart of the embodiment of the present disclosure indicates each operation step by arrows, the implementation order of these steps is not limited to the order indicated by the arrows. Unless clearly stated herein, in some implementation scenarios of the embodiment of the present disclosure, the implementation steps in each flowchart can be executed in other orders according to demand. In addition, some or all of the steps in each flowchart may include multiple sub-steps or multiple stages based on the actual implementation scenario. Some or all of these sub-steps or stages can be executed at the same time, and each sub-step or stage in these sub-steps or stages can also be executed at different times. In scenarios with different execution times, the execution order of these sub-steps or stages can be flexibly configured according to demand, and the embodiment of the present disclosure does not limit this.

[0262] The above text and drawings are provided only as examples to help readers understand the present disclosure. They are not intended and should not be interpreted as limiting the scope of the present disclosure in any way. Although certain embodiments and examples have been provided, based on the contents disclosed herein, it is obvious to those skilled in the art that the embodiments and examples shown can be changed without departing from the scope of the present disclosure, and other similar implementation means based on the technical ideas of the present disclosure are adopted, which also fall within the protection scope of the embodiments of the present disclosure.

Claims

1. A method performed by a first node in a communication system, characterized in that The method comprises: receiving a first signal; determining whether the first signal is a power-normalized signal; When the first signal is a power-normalized signal, a first method is used to perform channel estimation based on the first signal; when the first signal is a signal that has not been power-normalized, a second method is used to perform channel estimation based on the first signal.

2. The method according to claim 1, characterized in that The determining whether the first signal is a power-normalized signal comprises: receiving first information, wherein the first information is used to indicate whether the received signal is a power-normalized signal; Based on the first information, it is determined whether the first signal is a power-normalized signal.

3. The method according to claim 1, characterized in that The determining whether the first signal is a power-normalized signal comprises: Determining whether the first signal is a power-normalized signal based on at least one of the following: whether there is data that needs to be received in the time slot where the first signal is located; Whether a demodulation reference signal is configured in the time slot where the first signal is located; A comparison result of a bandwidth of a demodulation reference signal configured in a time slot where the first signal is located and a bandwidth of the first signal; Whether the data received in the time slot where the first signal is located is multi-port transmission data.

4. The method according to claim 1 or 2, characterized in that: The power normalization is power normalization at a subcarrier level.

5. The method according to any one of claims 1 to 4, characterized in that: The first signal is obtained based on the second signal, wherein the second signal is generated by mapping a second sequence to time domain resources, and when the first signal is a signal that is not power-normalized, the first signal is the second signal, and when the first signal is a power-normalized signal, the first signal is obtained by power-normalizing the second signal.

6. The method according to claim 5, characterized in that When the first signal is a power-normalized signal, the first signal is obtained by performing inverse Fourier transform on the second frequency domain signal, the second frequency domain signal is obtained by performing power normalization on the first frequency domain signal, and the first frequency domain signal is obtained by performing Fourier transform on the second signal.

7. The method according to claim 6, characterized in that The second frequency domain signal is obtained by remapping the signals on the subcarriers within the signal bandwidth in the first frequency signal after power normalization onto the corresponding subcarriers.

8. The method according to claim 6 or 7, characterized in that: The first frequency domain signal and / or the second frequency domain signal satisfies at least one of the following: The first frequency domain signal and the second frequency domain signal have the same bandwidth; The first frequency domain signal and the second frequency domain signal occupy the same subcarrier; The signal amplitude of each subcarrier within the bandwidth of the second frequency domain signal is the same; The signal amplitude of the second frequency domain signal is a first value, and the first value is determined based on the signal amplitudes of all subcarriers of the first frequency domain signal within its bandwidth; The second frequency domain signal and the first frequency domain signal have the same signal phase on the same subcarrier; The signal amplitude of the second frequency domain signal on the subcarrier outside the bandwidth thereof is a second value; The signal phase of the second frequency domain signal on the subcarrier outside its bandwidth is a third value; The signal amplitude and signal behavior of the second frequency domain signal on subcarriers outside its bandwidth are both 0.

9. The method according to any one of claims 1 to 8, characterized in that: Channel estimation includes: generating a third signal; Performing Fourier transform on the first signal to obtain a third frequency domain signal; Performing Fourier transform on the third signal to obtain a fourth frequency domain signal; When it is determined that the first signal is a signal that has not been power normalized, performing channel estimation based on the third frequency domain signal and the fourth frequency domain signal; When it is determined that the first signal is a power-normalized signal, the fourth frequency domain signal is power-normalized to obtain a fifth frequency domain signal, and channel estimation is performed based on the fifth frequency domain signal and the third frequency domain signal.

10. A method performed by a second node in a communication system, characterized in that The method comprises: Sending a first signal, wherein the first signal is a power-normalized signal or a signal that is not power-normalized; If the first signal is a power-normalized signal, the first signal is used to perform channel estimation using a first method; if the first signal is a signal that is not power-normalized, the first signal is used to perform channel estimation using a second method.

11. The method according to claim 10, characterized in that The method further comprises: First information is sent, where the first information is used to indicate whether the sent signal is a power-normalized signal.

12. A first node in a wireless communication system, characterized in that: The first node comprises a transceiver and at least one processor coupled to the transceiver, wherein the at least one processor is configured to execute the method according to any one of claims 1 to 9.

13. A second node in a wireless communication system, characterized in that: The second node comprises a transceiver and at least one processor coupled to the transceiver, wherein the at least one processor is configured to perform the method of claim 10 or 11.

14. A computer-readable storage medium, characterized in that: The storage medium stores a computer program, and when the computer program is executed by a processor, the method according to any one of claims 1 to 11 is executed.

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