Communication method and apparatus

Abstract

A communication method and apparatus, which relate to the technical field of communications. In the method, a terminal can learn a first bandwidth by means of first information, thereby sending or receiving a PTRS on the first bandwidth. The first bandwidth is determined on the basis of the PSD of the PTRS, that is, the first bandwidth used to send or receive the PTRS may match an actual channel condition, e.g., the current phase noise level. In this way, the phase noise error compensation performance can be guaranteed when a PTRS in a first bandwidth is used to perform phase noise suppression, thereby improving the demodulation performance.

Description

A communication method and apparatus

[0001] This application claims priority to Chinese Patent Application No. 202411434483.6, filed on October 14, 2024, entitled "A Communication Method and Apparatus", the entire contents of which are incorporated herein by reference. Technical Field

[0002] This application relates to the field of communication technology, and in particular to a communication method and apparatus. Background Technology

[0003] High frequencies (such as those above 6 GHz, mainly including 28 GHz, 39 GHz, 60 GHz, and 73 GHz) have become a hot topic of research and development in the industry due to their abundant frequency resources, used to address the ever-increasing communication demands. High frequencies can provide large bandwidth and highly integrated antenna arrays for high throughput. However, high-frequency communication suffers from severe mid-frequency distortion problems, such as phase noise (PHN), carrier frequency offset (CFO), and Doppler shift. To estimate and compensate for phase noise, a phase tracking reference signal (PTRS) is introduced into high-frequency communication. The frequency domain density of the PTRS can affect the accuracy of estimation and compensation caused by phase noise. However, network devices are unaware of current channel conditions, such as phase noise, when configuring the frequency domain density of the PTRS, which affects the performance of phase noise error compensation. Summary of the Invention

[0004] This application provides a communication method and apparatus that can ensure phase noise error compensation performance and improve demodulation performance.

[0005] Firstly, a communication method is provided. This method can be executed by a terminal, or by a module applied to the terminal (such as a processor, chip, or chip system), or by a logical node, logical module, or software capable of implementing all or part of the terminal's functions. Taking the application of this method to a terminal as an example, the terminal can receive first information, which indicates a first bandwidth. The first bandwidth is used to transmit PTRS, and the first bandwidth is determined based on the phase noise power spectral density (PSD) of the PTRS. In this way, the terminal can send or receive PTRS on the first bandwidth.

[0006] As can be seen, in the above embodiments, the terminal can obtain the first bandwidth through the first information, and thus can send or receive PTRS on the first bandwidth. The first bandwidth is determined based on the PSD of the PTRS, meaning that the first bandwidth used for sending or receiving PTRS can match the actual channel conditions, such as the current phase noise level. On one hand, this ensures phase noise error compensation performance and improves demodulation performance when using PTRS within the first bandwidth for phase noise suppression. For example, if the network device configures a corresponding frequency domain density for the terminal without knowing the current channel conditions, and this frequency domain density is too sparse, then even after using PTRS mapped to the frequency domain density for phase noise estimation and using the phase noise estimation result for phase compensation, phase noise error may still exist. That is, phase noise error compensation performance cannot be guaranteed when using PTRS within the frequency domain resources for phase noise suppression, and demodulation performance cannot be improved. On the other hand, this can reduce the overhead of frequency domain resource configuration and improve spectral efficiency. For example, if the network device configures a corresponding frequency domain density for the terminal without knowing the current channel conditions, and this frequency domain density is too fine, it may lead to an excessively large frequency domain configuration, increasing overhead and thus reducing spectral efficiency.

[0007] In one possible implementation, the method further includes: the terminal receiving second information, the second information indicating a second bandwidth, the second bandwidth being used to transmit PTRS. Thus, the terminal can transmit or receive PTRS on the second bandwidth, the PTRS in the second bandwidth being used to determine a PSD, the PSD being used to determine N first candidate bandwidths, the N first candidate bandwidths including the first bandwidth, and N being a positive integer.

[0008] As can be seen from the above embodiments, the terminal can obtain the second bandwidth through the second information, and thus can send or receive PTRS on the second bandwidth. When the terminal sends PTRS on the second bandwidth, the network device can use the PTRS in the second bandwidth to determine the PSD, that is, the network device uses continuous PTRS in the frequency domain to determine the PSD, which can improve the estimation accuracy of phase noise, thereby helping the network device to determine N first candidate bandwidths based on the PSD. When the terminal receives PTRS on the second bandwidth, the terminal can use the PTRS in the second bandwidth to determine the PSD, that is, the terminal uses continuous PTRS in the frequency domain to determine the PSD, which can improve the estimation accuracy of phase noise, thereby helping the terminal to determine N first candidate bandwidths based on the PSD.

[0009] In one possible implementation, the method further includes: the terminal sending third information, which indicates N first candidate bandwidths.

[0010] As can be seen from the above embodiments, the terminal can report N first candidate bandwidths, which is beneficial for the network device to select the first bandwidth from the N first candidate bandwidths.

[0011] In one possible implementation, the second bandwidth is determined based on the maximum measurement bandwidth supported by the terminal and / or the bandwidth scheduled for the terminal by the network device, wherein the maximum measurement bandwidth supported by the terminal is the bandwidth for measuring phase noise.

[0012] In one possible implementation, the method further includes: the terminal receiving fourth information, which indicates at least one of the following: the modulation and coding scheme scheduled by the network device for the terminal, the modulation order scheduled by the network device for the terminal, the bandwidth scheduled by the network device for the terminal, or the number of spatial streams scheduled by the network device for the terminal. The fourth information and the PSD are used to determine N first candidate bandwidths.

[0013] As can be seen, in the above embodiments, the terminal can receive fourth information, which helps the terminal to know the scheduling requirements of the network device. This allows the terminal to better determine the N first candidate bandwidths by combining the scheduling requirements of the network device and the PSD, reducing the situation where the candidate bandwidth determined by the terminal based solely on the PSD does not match the scheduling requirements of the network device, and improving the efficiency of determining the candidate bandwidth.

[0014] In one possible implementation, the third information is also used to indicate N measurement results corresponding to N first candidate bandwidths, each of the N measurement results being obtained based on a reference signal, and each of the N measurement results including at least one of the following: modulation coding method, modulation order, or signal quality.

[0015] As can be seen from the above embodiments, the terminal can also report N measurement results corresponding to N first candidate bandwidths to the network device, so that the network device can know the measurement results corresponding to each first candidate bandwidth, which is beneficial for the network device to better select the bandwidth for PTRS transmission by combining the corresponding measurement results.

[0016] In one possible implementation, the method further includes: the terminal receiving fifth information, which indicates the correspondence between M second candidate bandwidths and M bit indices, or the fifth information indicates the correspondence between M second candidate bandwidths, M bit indices, and M measurement results. Wherein, the M second candidate bandwidths belong to N first candidate bandwidths, the M measurement results belong to N measurement results, the bit index of the first information belongs to the M bit indices, and the first bandwidth is the candidate bandwidth corresponding to the bit index of the first information among the M second candidate bandwidths.

[0017] As can be seen from the above embodiments, the terminal can obtain the corresponding correspondence through the fifth information. In this way, the terminal can obtain the first bandwidth used for PTRS transmission based on the bit index and correspondence of the first information, ensuring that the terminal and network device have a consistent understanding of 'the first bandwidth used for PTRS transmission', thereby enabling correct decoding of PTRS.

[0018] In one possible implementation, the PTRS in the first bandwidth is mapped onto at least one symbol, and the at least one symbol is also mapped onto a first demodulation reference signal (DMRS).

[0019] As can be seen, in the above embodiments, PTRS and DMRS can share symbols. On one hand, using PTRS with shared symbols with DMRS for phase noise estimation can improve the estimation accuracy of inter-subcarrier interference (ICI) caused by phase noise. On the other hand, using PTRS with shared symbols with DMRS for phase noise estimation can reduce the common phase error (CPE) caused by phase noise, thereby improving the performance of the dual-symbol DMRS in desuperimposed orthogonal cover code (OCC) in the time domain. Furthermore, using PTRS with shared symbols with DMRS for phase noise estimation can reduce ICI caused by phase noise, thereby improving the signal-to-interference-plus-noise ratio (SINR) of the DMRS.

[0020] In one possible implementation, the third bandwidth used to transmit the first DMRS is determined based on the first bandwidth and the bandwidth scheduled by the network device for the terminal.

[0021] In one possible implementation, the first DMRS intercepts the second DMRS based on a first bandwidth, and the second DMRS is determined based on the bandwidth scheduled by the network device for the terminal. Alternatively, the first DMRS is determined based on a fourth bandwidth, which is determined based on the first bandwidth and the bandwidth scheduled by the network device for the terminal, and the fourth bandwidth is not mapped to PTRS.

[0022] Secondly, a communication method is provided. This method can be executed by a network device, or by a module applied to the network device (such as a processor, chip, or chip system), or by a logical node, logical module, or software capable of implementing all or part of the functions of the network device. Taking the application of this method to a network device as an example, in this method, the network device can send first information, which indicates a first bandwidth. The first bandwidth is used to transmit PTRS, and the first bandwidth is determined based on the PSD of the PTRS. In this way, the network device can send or receive PTRS on the first bandwidth.

[0023] As can be seen, in the above embodiments, the network device can send first information, enabling the terminal to obtain the first bandwidth through the first information, thereby allowing it to send or receive PTRS on the first bandwidth. The first bandwidth is determined based on the PSD of the PTRS; that is, the first bandwidth used for sending or receiving PTRS can match the actual channel conditions, such as the current phase noise level. On one hand, this ensures phase noise error compensation performance and improves demodulation performance when using PTRS within the first bandwidth for phase noise suppression. For example, if the network device configures a corresponding frequency domain density for the terminal without knowing the current channel conditions, and this frequency domain density is too sparse, then even after using PTRS mapped to the frequency domain density for phase noise estimation and using the phase noise estimation result for phase compensation, phase noise errors may still exist. In other words, phase noise error compensation performance cannot be guaranteed when using PTRS within the frequency domain resources for phase noise suppression, nor can demodulation performance be improved. On the other hand, this reduces the overhead of frequency domain resource configuration and improves spectral efficiency. For example, if a network device configures a terminal with a certain frequency domain density without knowing the current channel conditions, and this frequency domain density is too fine, it may lead to an excessively large frequency domain configuration, which will increase the overhead and reduce the spectrum efficiency.

[0024] In one possible implementation, the method further includes: the network device sending second information, the second information indicating a second bandwidth, the second bandwidth being used to transmit PTRS. Thus, the network device can send or receive PTRS on the second bandwidth, the PTRS in the second bandwidth being used to determine a PSD, the PSD being used to determine N first candidate bandwidths, the N first candidate bandwidths including the first bandwidth, and N being a positive integer.

[0025] As can be seen, in the above embodiments, the network device can send second information, enabling the terminal to obtain the second bandwidth through the second information, thereby allowing it to send or receive PTRS on the second bandwidth. When the terminal sends PTRS on the second bandwidth, the network device can use the PTRS in the second bandwidth to determine the PSD, that is, the network device uses continuous PTRS in the frequency domain to determine the PSD. This can improve the estimation accuracy of phase noise, thus facilitating the network device to determine N first candidate bandwidths based on the PSD. When the terminal receives PTRS on the second bandwidth, the terminal can use the PTRS in the second bandwidth to determine the PSD, that is, the terminal uses continuous PTRS in the frequency domain to determine the PSD. This can improve the estimation accuracy of phase noise, thus facilitating the terminal to determine N first candidate bandwidths based on the PSD.

[0026] In one possible implementation, the method further includes: the network device receiving third information, which is used to indicate N first candidate bandwidths.

[0027] As can be seen, in the above embodiments, the network device can know N first candidate bandwidths, which is beneficial for the network device to select the first bandwidth from the N first candidate bandwidths.

[0028] In one possible implementation, the second bandwidth is determined based on the maximum measurement bandwidth supported by the terminal and / or the bandwidth scheduled for the terminal by the network device, wherein the maximum measurement bandwidth supported by the terminal is the bandwidth for measuring phase noise.

[0029] In one possible implementation, the method further includes: the network device sending fourth information, which indicates at least one of the following: the modulation and coding scheme scheduled by the network device for the terminal, the modulation order scheduled by the network device for the terminal, the bandwidth scheduled by the network device for the terminal, or the number of spatial streams scheduled by the network device for the terminal. The fourth information and the PSD are used to determine N first candidate bandwidths.

[0030] As can be seen, in the above embodiments, the network device can send fourth information, which helps the terminal to know the scheduling requirements of the network device through the fourth information. In this way, the terminal can better determine the N first candidate bandwidths by combining the scheduling requirements of the network device and the PSD, reducing the situation where the candidate bandwidth determined by the terminal only refers to the PSD does not match the scheduling requirements of the network device, and improving the efficiency of determining the candidate bandwidth.

[0031] In one possible implementation, the third information is also used to indicate N measurement results corresponding to N first candidate bandwidths, each of the N measurement results being obtained based on a reference signal, and each of the N measurement results including at least one of the following: modulation coding method, modulation order, or signal quality.

[0032] As can be seen from the above embodiments, the network device can also obtain N measurement results corresponding to N first candidate bandwidths, so that the network device can obtain the measurement results corresponding to each first candidate bandwidth, which is beneficial for the network device to better select the bandwidth for PTRS transmission by combining the corresponding measurement results.

[0033] In one possible implementation, the method further includes: the network device sending fifth information, which indicates the correspondence between M second candidate bandwidths and M bit indices, or the fifth information indicates the correspondence between M second candidate bandwidths, M bit indices, and M measurement results. Wherein, the M second candidate bandwidths belong to N first candidate bandwidths, the M measurement results belong to N measurement results, the bit index of the first information belongs to the M bit indices, and the first bandwidth is the candidate bandwidth corresponding to the bit index of the first information among the M second candidate bandwidths.

[0034] As can be seen from the above embodiments, the network device can send fifth information, enabling the terminal to obtain the corresponding correspondence through the fifth information. In this way, the terminal can obtain the first bandwidth used for PTRS transmission based on the bit index and correspondence of the first information, ensuring that the terminal and the network device have a consistent understanding of 'the first bandwidth used for PTRS transmission', thereby enabling correct decoding of PTRS.

[0035] In one possible implementation, the PTRS in the first bandwidth is mapped onto at least one symbol, and the first DMRS is also mapped onto the at least one symbol.

[0036] As can be seen, in the above embodiments, PTRS and DMRS can share a common symbol. On one hand, using the PTRS with the same symbol as the DMRS for phase noise estimation can improve the estimation accuracy of ICI caused by phase noise. On the other hand, using the PTRS with the same symbol as the DMRS for phase noise estimation can reduce CPE caused by phase noise, thereby improving the time-domain OCC performance of the dual-symbol DMRS. Furthermore, using the PTRS with the same symbol as the DMRS for phase noise estimation can reduce ICI caused by phase noise, thereby improving the SINR of the DMRS.

[0037] In one possible implementation, the third bandwidth used for transmitting DMRS is determined based on the first bandwidth and the bandwidth scheduled by the network device for the terminal.

[0038] In one possible implementation, the first DMRS intercepts the second DMRS based on a first bandwidth, and the second DMRS is determined based on the bandwidth scheduled by the network device for the terminal. Alternatively, the first DMRS is determined based on a fourth bandwidth, which is determined based on the first bandwidth and the bandwidth scheduled by the network device for the terminal, and the fourth bandwidth is not mapped to PTRS.

[0039] Thirdly, a communication method is provided. This method can be executed by a terminal, or by a module applied to the terminal (such as a processor, chip, or chip system), or by a logical node, logical module, or software capable of implementing all or part of the terminal's functions. Taking the application of this method to a terminal as an example, the terminal can receive sixth information, which indicates a fifth bandwidth used for transmitting PTRS. Thus, the terminal can send or receive PTRS on the fifth bandwidth, where the PTRS in the fifth bandwidth is mapped to at least one symbol, and at least one symbol is also mapped to a third DMRS.

[0040] As can be seen from the above embodiments, the terminal can obtain the fifth bandwidth through the sixth information, thereby enabling it to transmit or receive PTRS on the first bandwidth. The PTRS in the fifth bandwidth is mapped to at least one symbol, and at least one symbol is also mapped to a third DMRS, meaning that PTRS and DMRS can share a symbol. From one perspective, using the PTRS that shares a symbol with the DMRS for phase noise estimation can improve the estimation accuracy of ICI caused by phase noise. From another perspective, using the phase noise estimation of the PTRS that shares a symbol with the DMRS can reduce CPE caused by phase noise, thereby improving the performance of OCC decomposition in the time domain for the dual-symbol DMRS. From yet another perspective, using the phase noise estimation of the PTRS that shares a symbol with the DMRS can reduce ICI caused by phase noise, thereby improving the SINR of the DMRS.

[0041] In one possible implementation, the sixth bandwidth used to transmit the third DMRS is determined based on the fifth bandwidth and the bandwidth scheduled by the network device for the terminal.

[0042] In one possible implementation, the third DMRS intercepts the second DMRS based on the fifth bandwidth, and the second DMRS is determined based on the bandwidth scheduled by the network device for the terminal. Alternatively, the third DMRS is determined based on the seventh bandwidth, which is based on the fifth bandwidth and the bandwidth scheduled by the network device for the terminal, and the seventh bandwidth is not mapped to PTRS.

[0043] Fourthly, a communication method is provided. This method can be executed by a network device, or by a module (e.g., processor, chip, or chip system) applied to the network device, or by a logical node, logical module, or software capable of implementing all or part of the functions of the network device. Taking the application of this method to a network device as an example, in this method, the network device can send a sixth message indicating a fifth bandwidth, which is used to transmit PTRS. Thus, the network device can send or receive PTRS on the fifth bandwidth, where the PTRS in the fifth bandwidth is mapped to at least one symbol, and at least one symbol is also mapped to a third DMRS.

[0044] As can be seen, in the above embodiments, the network device can send sixth information, enabling the terminal to obtain the fifth bandwidth through the sixth information, thereby allowing it to send or receive PTRS on the first bandwidth. The PTRS in the fifth bandwidth is mapped to at least one symbol, and at least one symbol is also mapped to a third DMRS, meaning the PTRS and DMRS can share a symbol. From one perspective, using the PTRS with the shared symbol for phase noise estimation can improve the estimation accuracy of ICI caused by phase noise. From another perspective, using the PTRS with the shared symbol for phase noise estimation can reduce CPE caused by phase noise, thereby improving the performance of OCC decomposition in the time domain for the dual-symbol DMRS. Furthermore, using the PTRS with the shared symbol for phase noise estimation can reduce ICI caused by phase noise, thereby improving the SINR of the DMRS.

[0045] In one possible implementation, the sixth bandwidth used to transmit the third DMRS is determined based on the fifth bandwidth and the bandwidth scheduled by the network device for the terminal.

[0046] In one possible implementation, the third DMRS intercepts the second DMRS based on the fifth bandwidth, and the second DMRS is determined based on the bandwidth scheduled by the network device for the terminal. Alternatively, the third DMRS is determined based on the seventh bandwidth, which is based on the fifth bandwidth and the bandwidth scheduled by the network device for the terminal, and the seventh bandwidth is not mapped to PTRS.

[0047] Fifthly, a communication device is provided, comprising units, modules, or means for implementing the methods described in any one of the first, second, third, or fourth aspects. The communication device may be a terminal, a module of a terminal (e.g., a processor, chip, or chip system), or a logical node, logical module, or software capable of implementing all or part of the terminal's functions. Alternatively, the communication device may be a network device, a module of a network device (e.g., a processor, chip, or chip system), or a logical node, logical module, or software capable of implementing all or part of the network device's functions.

[0048] A sixth aspect provides a communication device including at least one processor. The at least one processor is configured to cause the communication device to perform the method described in any one of the first, second, third, or fourth aspects. The communication device may be a terminal, a module of a terminal (e.g., a processor, chip, or chip system), or a logical node, logical module, or software capable of implementing all or part of the terminal's functions. Alternatively, the communication device may be a network device, a module of a network device (e.g., a processor, chip, or chip system), or a logical node, logical module, or software capable of implementing all or part of the network device's functions. The at least one processor can execute computer programs or instructions stored in a memory to cause the aforementioned method to be performed. The memory may be included in the communication device or located outside the communication device. Furthermore, the communication device may also include an interface.

[0049] In a seventh aspect, a computer-readable storage medium is provided, which stores computer instructions or programs that, when executed, cause a computer to perform the method as described in any one of the first, second, third, or fourth aspects.

[0050] Eighthly, a computer program product is provided, comprising: a computer program or program that, when executed by a computer, causes the computer to perform the method as described in any one of the first, second, third, or fourth aspects.

[0051] A ninth aspect provides a chip including at least one processor and an interface. The processor is configured to execute computer instructions or programs, which, when run, cause the chip to perform the method described in any one of the first, second, third, or fourth aspects. The processor may execute computer programs or instructions stored in memory to cause the described method to be performed. The memory may be included in the chip or located externally. Furthermore, the chip may also include an interface.

[0052] A tenth aspect provides a communication system comprising a terminal for performing the method as described in any one of the first aspects and a network device for performing the method as described in any one of the second aspects.

[0053] Eleventhly, a communication system is provided, comprising a terminal for performing the method as described in any one of the third aspects and a network device for performing the method as described in any one of the fourth aspects. Attached Figure Description

[0054] Figure 1 shows the basic architecture of a communication system;

[0055] Figure 2 is a flowchart illustrating a communication method provided in an embodiment of this application;

[0056] Figure 3 is a schematic diagram of a common symbol for DMRS and PTRS provided in an embodiment of this application;

[0057] Figure 4 is a schematic diagram of another common symbol for DMRS and PTRS provided in an embodiment of this application;

[0058] Figure 5 is a flowchart illustrating another communication method provided in an embodiment of this application;

[0059] Figure 6 is a flowchart illustrating another communication method provided in an embodiment of this application;

[0060] Figure 7 is a flowchart illustrating another communication method provided in an embodiment of this application;

[0061] Figure 8 is a schematic diagram of the structure of a communication device provided in an embodiment of this application;

[0062] Figure 9 is a schematic diagram of the structure of another communication device provided in an embodiment of this application. Detailed Implementation

[0063] The technical solutions in the embodiments of this application will be described below with reference to the accompanying drawings. The terms "system" and "network" in the embodiments of this application can be used interchangeably. Unless otherwise stated, " / " indicates that the objects before and after are in an "or" relationship; for example, A / B can represent A or B. "And / or" in this application is merely a description of the relationship between related objects, indicating that three relationships can exist. For example, A and / or B can represent: A alone, A and B simultaneously, and B alone, where A and B can be singular or plural. Furthermore, in the description of this application, unless otherwise stated, "multiple" refers to two or more. "At least one of the following" or similar expressions refer to any combination of these items, including any combination of single or plural items. For example, at least one of a, b, or c can represent: a, b, c, ab, ac, bc, or abc, where a, b, and c can be one or multiple. Furthermore, to facilitate a clear description of the technical solutions in the embodiments of this application, the terms "first" and "second" are used in the embodiments of this application to distinguish between network elements and similar items with essentially the same function. Those skilled in the art will understand that the terms "first" and "second" do not limit the quantity or execution order, and that "first" and "second" are not necessarily different. Additionally, the numbering of steps in the various embodiments described in this application is only for distinguishing different steps and is not intended to limit the order of steps.

[0064] References to "one embodiment" or "some embodiments" in the embodiments described in this application mean that one or more embodiments of this application include a specific feature, structure, or characteristic described in connection with that embodiment. Therefore, the phrases "in one embodiment," "in some embodiments," "in other embodiments," "in still other embodiments," etc., appearing in different parts of this specification do not necessarily refer to the same embodiment, but rather mean "one or more, but not all, embodiments," unless otherwise specifically emphasized. The terms "comprising," "including," "having," and variations thereof mean "including but not limited to," unless otherwise specifically emphasized.

[0065] The following detailed embodiments further illustrate the objectives, technical solutions, and beneficial effects of this application. It should be understood that the following are merely specific embodiments of this application and are not intended to limit the scope of protection of this application. Any modifications, equivalent substitutions, improvements, etc., made based on the technical solutions of this application should be included within the scope of protection of this application.

[0066] In the various embodiments of this application, unless otherwise specified or in case of logical conflict, the terminology and / or descriptions of different embodiments are consistent and can be referenced by each other. The technical features of different embodiments can be combined to form new embodiments according to their inherent logical relationship.

[0067] The method provided in this application can be applied to various communication systems, such as Internet of Things (IoT) systems, narrowband Internet of Things (NB-IoT) systems, long-term evolution (LTE) systems, 5th-generation (5G) communication systems, new radio (NR) systems, or new communication systems emerging in future communication developments. IoT networks may include, but are not limited to, vehicle-to-everything (V2X) networks. Communication methods in V2X systems can be collectively referred to as vehicle-to-everything (V2X), where X can represent anything. For example, V2X can include: vehicle-to-vehicle (V2V) communication, vehicle-to-infrastructure (V2I) communication, vehicle-to-pedestrian (V2P) communication, or vehicle-to-network (V2N) communication, etc. The method provided in this application embodiment can also be applied to non-terrestrial network (NTN) communication (also known as non-land network communication), or scenarios where NTN and terrestrial network (TN) are integrated.

[0068] The method provided in this application embodiment can be applied to wireless local area network (WLAN) systems, such as Wi-Fi.

[0069] The method provided in this application can be applied between two entities in a communication system, such as one entity sending information to or receiving information sent by the other entity. In a wireless communication system, communication devices are included, and these devices can communicate wirelessly using air interface resources. Air interface resources may include at least one of time-domain resources, frequency-domain resources, code resources, and spatial resources; this application does not limit this. For example, the aforementioned two entities may include a network device and a terminal, or may include a chip that can be placed in a network device and a chip that can be placed in a terminal, etc. Of course, as standards or products advance, other types of entities may emerge subsequently; this application does not limit this.

[0070] The basic architecture of the communication system provided in the embodiments of this application is described below. The communication system provided in this application may include one or more network devices and one or more terminals.

[0071] The following explanation uses the system architecture shown in Figure 1 as an example. In Figure 1, the communication system includes a network device 10 and a terminal 20 that communicates with the network device 10.

[0072] It should be noted that the number of network devices and terminals in Figure 1 is merely illustrative and should not be considered as a specific limitation of this application. The terminals and network devices involved in the system architecture will be described in detail below.

[0073] I. Terminal

[0074] The terminal can be a device or module that accesses the aforementioned communication system and has corresponding communication functions. Specifically, the terminal can refer to user equipment (UE), access terminal, user unit, user station, mobile station, mobile station, remote station, remote terminal, mobile device, terminal, wireless communication equipment, user agent, user equipment, or roadside unit (RSU). The terminal may contain communication modules, circuits, or chips that perform corresponding communication functions. The terminal may also be configured with program instructions for performing corresponding communication functions.

[0075] For example, a terminal can be a drone, an Internet of Things (IoT) device, a station (ST) in a wireless local area network (WLAN), a cellular phone, a smartphone, a cordless phone, a wireless data card, a tablet computer, a session initiation protocol (SIP) phone, a wireless local loop (WLL) station, a personal digital assistant (PDA) device, a laptop computer, a machine type communication (MTC) terminal, a handheld device with wireless communication capabilities, a computing device or other processing device connected to a wireless modem, an in-vehicle device, a wearable device (also known as a wearable smart device), a virtual reality (VR) terminal, an augmented reality (AR) terminal, a wireless terminal in remote medical care, a wireless terminal in industrial control, a wireless terminal in self-driving, a wireless terminal in a smart grid, or a wireless terminal in transportation safety. Wireless terminals in smart cities, smart homes, and transportation vehicles with wireless communication capabilities, as well as communication modules, are examples of wireless terminals. Terminals can also be used in 5G systems or next-generation communication systems; this application does not limit the specific application to these applications.

[0076] The embodiments of this application do not limit the device form of the terminal. The device used to implement the functions of the terminal can be the terminal itself; it can also be a device that supports the terminal in implementing the functions, such as a chip system. The device can be installed in the terminal or used in conjunction with the terminal. In the embodiments of this application, the chip system can be composed of chips or can include chips and other discrete devices.

[0077] II. Network Equipment

[0078] The network device can be a device or module located on the network side of the aforementioned communication system and possessing corresponding communication functions. The network device can be a device deployed in a radio access network (RAN) to provide wireless communication functions for terminals. The network device may contain communication modules, circuits, or chips that perform the corresponding communication functions. The network device may also be configured with program instructions for performing the corresponding communication functions and corresponding program instructions.

[0079] In one possible scenario, network equipment can be devices with base station functions, such as evolved NodeBs (eNodeBs), transmitting and receiving points (TRPs), transmitting points (TPs), next-generation NodeBs (gNBs), base stations in future mobile communication systems, integrated access and backhaul (IAB) nodes, and non-terrestrial network equipment, i.e., equipment that can be deployed on high-altitude platforms or satellites. Network equipment can also be transmitting and receiving points (TRPs), base stations, and various forms of control nodes, such as network controllers and wireless controllers. Specifically, network equipment can be various forms of macro base stations, micro base stations (also known as small cells) in heterogeneous network (HetNet) scenarios, relay stations, access points (APs), radio network controllers (RNCs), node Bs (NBs), base station controllers (BSCs), base transceiver stations (BTSs), home base stations (e.g., home evolved node Bs, or home node Bs (HNBs)), baseband units (BBUs) and remote radio units (RRUs) in distributed base station scenarios, transmitting and receiving points (TRPs), transmitting points (TPs), mobile switching centers, etc., and can also be base station antenna panels. Control nodes can connect to multiple base stations and configure resources for multiple terminals covered by multiple base stations. In systems employing different wireless access technologies, the names of devices with base station functions may differ. For example, it could be a gNB in ​​5G, or a network-side device in a network after 5G, or a network device in a future evolved public land mobile network (PLMN) network, or a device that performs base station functions in device-to-device (D2D) communication, machine-to-machine (M2M) communication, or vehicle-to-everything (V2X) communication, etc. This application does not limit the specific name of the network device.Network equipment can also be open RAN (O-RAN or ORAN), baseband pool (BBU pool) and RRU under cloud radio access network (CRAN), etc.

[0080] In another possible scenario, multiple network devices collaborate to assist terminals in achieving wireless access, with each network device performing a portion of the base station's functions. For example, network devices may include a central unit (CU), a distributed unit (DU), a CU-control plane (CP), a CU-user plane (UP), or a radio unit (RU). CUs and DUs can be separate entities or included in the same network element, such as a baseband unit (BBU). RUs may be included in radio equipment or radio units, such as remote radio units (RRUs), active antenna units (AAUs), or remote radio heads (RRHs). It is understood that network devices can be CU nodes, DU nodes, or devices comprising both CU and DU nodes. Furthermore, CUs can be classified as network devices in the access network (RAN) or in the core network (CN), without limitation.

[0081] In different systems, CU (or CU-CP and CU-UP), DU, or RU may have different names, but those skilled in the art will understand their meaning. For example, in an ORAN system, CU can also be called O-CU (open CU), DU can also be called O-DU, CU-CP can also be called O-CU-CP, CU-UP can also be called O-CU-UP, and RU can also be called O-RU. For ease of description, this application uses CU, CU-CP, CU-UP, DU, and RU as examples. Any of the units among CU (or CU-CP, CU-UP), DU, and RU in this application can be implemented through software modules, hardware modules, or a combination of software and hardware modules.

[0082] In this embodiment, the form of the network device is not limited. The device used to implement the function of the network device can be the network device itself, or it can be a device that supports the network device in implementing the function, such as a chip system. The device can be installed in the network device or used in conjunction with the network device.

[0083] In this embodiment, the terminal and the network device can communicate via an air interface link. This air interface link can be categorized into uplink (UL) and downlink (DL) based on the direction of data transmission. Uplink data from the terminal to the base station can be transmitted on the UL, while downlink data from the base station to the terminal can be transmitted on the DL.

[0084] To facilitate understanding of the content of this solution, some terms used in the embodiments of this application will be explained below, so that those skilled in the art can understand them. This part is only for the purpose of understanding and should not be regarded as a specific limitation of this application.

[0085] I. Measurement Results

[0086] In this application, the measurement result is obtained by measuring a reference signal. For example, it may include at least one of the following: modulation coding scheme, modulation order, or signal quality.

[0087] The reference signal can be used for one or more of the following: channel estimation, channel measurement, time synchronization, and frequency synchronization. For example, the reference signal can be a channel state information reference signal (CSI-RS) or other reference signals, such as a sounding reference signal (SRS) or a positioning reference signal (PRS), etc., without limitation.

[0088] Optionally, the modulation and coding scheme can be a modulation and coding scheme (MCS).

[0089] Optionally, signal quality may include at least one of the following: reference signal received power (RSRP), reference signal received quality (RSRQ), received signal strength indicator (RSSI), signal to interference plus noise ratio (SINR), or channel quality indicator (CQI), etc.

[0090] II. PTRS

[0091] In this application, the PTRS within a certain bandwidth (such as the first bandwidth, second bandwidth, or fourth bandwidth below) is continuous in the frequency domain. That is, the PTRS in this application is a block PTRS. In the following text, unless otherwise specified, PTRS can be understood as a PTRS that is continuous in the frequency domain or a block PTRS. Optionally, before transmitting PTRS on a certain bandwidth, the terminal or network device can generate PTRS based on a predefined method.

[0092] For example, the process by which a terminal generates PTRS based on a predefined method is as follows:

[0093] 1. The terminal generates a sequence of odd or even length based on a certain bandwidth (such as the first bandwidth, second bandwidth, or fourth bandwidth below).

[0094] Optionally, the length of sequence 1 can be less than or equal to the bandwidth. Sequence 1 can be a Zadoff-Chu (ZC) sequence or any other predefined sequence, which is not limited in this application.

[0095] Optionally, when the length of sequence 1 is odd, the terminal can pad sequence 1 to an even-length sequence, such as a multiple of 12. Alternatively, the terminal can truncate a portion of sequence 1, such as sequence 2, where the length of sequence 2 is even.

[0096] 2. The terminal performs a cyclic expansion on either sequence 1 or sequence 2. For example, it copies the last N elements of sequence 1 and places or appends them before the first element of sequence 1. Alternatively, it copies the last M elements of sequence 2 and places or appends them before the first element of sequence 2.

[0097] Where N and M can be positive integers.

[0098] 3. The terminal performs Fourier transform processing on either Sequence 1 or Sequence 2 after cyclic expansion.

[0099] 4. The terminal maps either Sequence 1 or Sequence 2, which has undergone Fourier transform processing, onto the aforementioned bandwidth.

[0100] For example, the process by which a network device generates PTRS based on a predefined method is as follows:

[0101] 1. The network device generates a sequence of odd or even lengths based on a certain bandwidth (such as the first bandwidth, second bandwidth, or fourth bandwidth below).

[0102] Optionally, the length of sequence 1 can be less than or equal to the bandwidth. Sequence 1 can be a Zadoff-Chu (ZC) sequence or any other predefined sequence, which is not limited in this application.

[0103] Optionally, when the length of sequence 1 is odd, the network device can pad sequence 1 to an even-length sequence, such as a multiple of 12. Alternatively, the network device can truncate a portion of sequence 1, such as sequence 2, where the length of sequence 2 is even.

[0104] 2. The network device performs a cyclic extension on either Sequence 1 or Sequence 2. For example, it copies the last N elements of Sequence 1 and places or appends them before the first element of Sequence 1. Alternatively, it copies the last M elements of Sequence 2 and places or appends them before the first element of Sequence 2.

[0105] Where N and M can be positive integers.

[0106] 3. The network device performs Fourier transform processing on either Sequence 1 or Sequence 2 after cyclic expansion.

[0107] 4. The network device maps either Sequence 1 or Sequence 2, which has undergone Fourier transform processing, onto the aforementioned bandwidth.

[0108] The embodiments of this application are described in detail below. The executing entities involved in the embodiments of this application can be a first communication device and a second communication device. The first communication device or the second communication device can be any two devices capable of communication shown in Figure 1. The specific names of the first communication device and the second communication device are not limited in the embodiments of this application. As an example, the first communication device can be a terminal or a chip or functional module of a terminal, etc., and the second communication device can be a network device or a chip or functional module of a network device, etc. As another example, the first communication device can be a network device or a chip or functional module of a network device, and the second communication device can be a terminal or a chip or functional module of a terminal. As yet another example, the first communication device and the second communication device can be different terminals, etc. Specific forms of the first communication device and the second communication device will not be listed here. For ease of description, the embodiments of this application are described using the first communication device as a terminal and the second communication device as a network device as an example, and this should not be considered a limitation of this application.

[0109] Referring to Figure 2, which is a flowchart illustrating a communication method provided in an embodiment of this application, the method includes, but is not limited to, the following steps:

[0110] 201. The network device sends first information, which is used to indicate a first bandwidth. The first bandwidth is used to transmit PTRS and is determined based on the PSD of PTRS.

[0111] Accordingly, the terminal receives the first information.

[0112] For example, the first information can be carried in radio resource control (RRC) signaling, downlink control information (DCI), media access control-control element (MAC CE), or other signaling, without limitation. Here, the RRC signaling can be RRC reconfiguration signaling or other RRC signaling, without limitation. In one possible implementation, when the first information is carried in RRC signaling, the first information can be called configuration information, such as RRC reconfiguration information. When the first information is carried in DCI signaling, DCI can also schedule the terminal to receive data, etc., without limitation in this application.

[0113] The following example illustrates how to determine the first bandwidth.

[0114] Optionally, the first bandwidth can be determined by the terminal or network device based on the PSD, or it can be predefined; this application does not limit this. When the first bandwidth is determined by the terminal based on the PSD, the specific process can be referred to in case ①. When the first bandwidth is determined by the network device based on the PSD, the specific process can be referred to in case ②.

[0115] Case ①: The first bandwidth is determined by the terminal based on the PSD, which may include the following steps A1 to A3, wherein:

[0116] Step A1: The network device sends a second message, which indicates a second bandwidth used for PTRS transmission.

[0117] Accordingly, the terminal receives the second information.

[0118] For example, the second information can be carried in RRC signaling, DCI, MAC CE, or other signaling, without limitation. Here, the RRC signaling can be RRC configuration signaling or other RRC signaling, without limitation. In one possible implementation, when the second information is carried in RRC signaling, the second information can be called configuration information, such as RRC configuration information.

[0119] Optionally, the second bandwidth can be indicated by different values ​​of the second information, by different values ​​of some bits in the second information, by different values ​​of at least one field in the second information, or by different values ​​of some bits of at least one field in the second information; this application does not limit this. For example, the second bandwidth can be indicated by the bit index of the second information, or in other words, the second bandwidth can be indicated by at least one bit of the second information. Assuming the bit index or at least one bit of the second information has a value of 000, the second bandwidth is 48 MHz. Assuming the bit index or at least one bit of the second information has a value of 001, the second bandwidth is 60 MHz, and so on.

[0120] Optionally, the second information can also be used to indicate other content besides the second bandwidth. For example, the second information can also be used to indicate at least one of the following: the number of transport layers mapped by the PTRS, the index of the transport layer mapped by the PTRS, or the time-domain resources occupied by the PTRS, etc. The time-domain resources can be a continuous or discontinuous resource in the time domain, such as symbols. For example, assuming the time-domain resources occupied by the PTRS are symbols, the time-domain resources occupied by the PTRS can be indicated by a symbol index set or a starting symbol index, etc., and this application does not limit this.

[0121] The following example illustrates how to determine the second bandwidth.

[0122] Optionally, the second bandwidth can be determined based on the maximum measurement bandwidth supported by the terminal and / or the bandwidth scheduled for the terminal by the network device. Alternatively, it can be predefined, which is not limited in this application. In this way, the terminal can improve the estimation accuracy of phase noise when determining the PSD based on the PTRS in the second bandwidth, thereby facilitating the terminal to determine N first candidate bandwidths based on the PSD.

[0123] The maximum measurement bandwidth supported by the terminal is the bandwidth used by the terminal to measure phase noise. In other words, the maximum measurement bandwidth supported by the terminal is the bandwidth that the terminal expects to use to measure phase noise.

[0124] Optionally, the maximum measurement bandwidth supported by the terminal can be indicated to the network device by the terminal directly or indirectly. For example, the maximum measurement bandwidth supported by the terminal can be carried in RRC signaling (such as UE capability information signaling) or uplink control information (UCI), which is not limited here.

[0125] Step A2: The network device sends PTRS on the second bandwidth.

[0126] Accordingly, the terminal receives PTRS on the second bandwidth.

[0127] Step A3: The terminal determines the PSD based on the PTRS in the second bandwidth, and determines N first candidate bandwidths based on the PSD. The N first candidate bandwidths include the first bandwidth, and N is a positive integer.

[0128] The terminal can determine N first candidate bandwidths in the following ways:

[0129] Method 1: The terminal receives the fourth information, and can then determine N first candidate bandwidths based on the PSD and the fourth information. Optionally, the terminal can also determine the N first candidate bandwidths based on other information (such as power consumption, capacity, etc.). The specific methods for determining the N first candidate bandwidths will be illustrated below, but will not be described here.

[0130] Method 2: If the terminal does not receive the fourth information, it can determine N first candidate bandwidths based on the PSD. Optionally, the terminal can also determine N first candidate bandwidths based on other information (such as power consumption, capacity, etc.). The specific methods for determining the N first candidate bandwidths will be illustrated below, but will not be described here.

[0131] Optionally, in method 1 or method 2 above, the fourth information can be used to indicate at least one of the following: the modulation and coding scheme scheduled by the network device for the terminal, the modulation order scheduled by the network device for the terminal, the bandwidth (or data transmission bandwidth) scheduled by the network device for the terminal, or the number of spatial streams scheduled by the network device for the terminal. Optionally, the fourth information can be carried in the same signaling or different signaling as the second information above. The signaling here can be RRC signaling, DCI, MAC CE or other signaling, and is not limited here.

[0132] Scenario ②: The first bandwidth is determined by the network device based on the PSD, which may include the following steps B1 to B3, wherein:

[0133] Step B1: The network device sends a second message, which indicates a second bandwidth used for PTRS transmission.

[0134] Accordingly, the terminal receives the second information.

[0135] Step B1 can be similar to step A1 in case ① above, and will not be described in detail here.

[0136] Step B2: The terminal sends PTRS on the second bandwidth.

[0137] Accordingly, the network equipment receives PTRS on the second bandwidth.

[0138] Step B3: The network device determines the PSD based on the PTRS in the second bandwidth, and determines N first candidate bandwidths based on the PSD. The N first candidate bandwidths include the first bandwidth, and N is a positive integer.

[0139] The following examples illustrate the specific methods for determining the N first candidate bandwidths in either scenario ① or scenario ②.

[0140] For example, suppose a terminal or network device determines N first candidate bandwidths based on the PSD and capacity. For instance, the terminal can determine N1 candidate bandwidths based on the PSD, where N1 is a positive integer. The terminal can then calculate the error vector magnitude (EVM) that can be reduced by phase noise suppression at different candidate bandwidths among the N1 candidate bandwidths. EVM is the square root of the ratio of the average power of the error vector to the average power of the reference signal. The N1 candidate bandwidths can correspond to N1 EVMs. For example, taking any one of the N1 EVMs (denoted as EVM1), the terminal can determine the achievable MCS based on the difference between the total EVM and EVM1. If the difference between the total EVM and EVM1 corresponds to this MCS, the terminal can determine the MCS based on this correspondence and the difference between the total EVM and EVM1, and then calculate the achievable capacity based on the PTRS overhead in the candidate bandwidth corresponding to this MCS and EVM1. In other words, N1 candidate bandwidths can correspond to N1 achievable capacities. Thus, the terminal can select the N candidate bandwidths with the largest achievable capacity under different MCSs from the N1 candidate bandwidths as the N first candidate bandwidths.

[0141] Optionally, the total EVM can be determined based on at least one of the following: the modulation and coding scheme scheduled by the network device for the terminal, the modulation order scheduled by the network device for the terminal, the bandwidth scheduled by the network device for the terminal, or the number of spatial streams scheduled by the network device for the terminal. Alternatively, it can be described as follows: the total EVM is determined based on fourth information. For example, the terminal can determine the total EVM based on the fourth information, such as the modulation and coding scheme scheduled by the network device for the terminal corresponding to an EVM range, where the total EVM can be any value within the EVM range. In this case, it can be considered that the terminal determines N first candidate bandwidths based on PSD, the fourth information, and other information (such as power consumption, capacity, etc.), or the network device determines it based on at least one of the following: the modulation and coding scheme scheduled by the network device for the terminal, the modulation order scheduled by the network device for the terminal, the bandwidth scheduled by the network device for the terminal, or the number of spatial streams scheduled by the network device for the terminal, PSD, and other information (such as power consumption, capacity, etc.). Alternatively, the total EVM can be determined based on a reference signal; for example, the terminal or network device can determine the SINR based on a reference signal, and thus determine the total EVM based on the SINR. In this case, it can be viewed as: the terminal or network device determines N first candidate bandwidths based on PSD and other information (such as power consumption, capacity, etc.).

[0142] Optionally, in case ① above (i.e., the first bandwidth is determined by the terminal based on the PSD), the terminal may also report N first candidate bandwidths. For example, the terminal sends third information, which is used to indicate the N first candidate bandwidths. Optionally, the above third information may be carried in RRC signaling, UCI, MAC CE or other signaling, and is not limited here.

[0143] Optionally, the third information can also be used to indicate the N measurement results corresponding to the N first candidate bandwidths. For example, in mode 2 of the above case ① (i.e., the terminal does not receive the fourth information and determines the N first candidate bandwidths based on the PSD), the third information can also be used to indicate the N measurement results corresponding to the N first candidate bandwidths.

[0144] The following describes several possible correspondences between the first candidate bandwidth and the measurement results.

[0145] Table 1 illustrates the one-to-one correspondence between the first candidate bandwidth and the measurement result. Specifically, in Table 1, when the first candidate bandwidth is candidate bandwidth 1, the measurement result is measurement result 1. When the first candidate bandwidth is candidate bandwidth 2, the measurement result is measurement result 2.

[0146] Table 1

[0147] Table 2 illustrates the one-to-many relationship between the first candidate bandwidth and the measurement results. Specifically, in Table 2, when the first candidate bandwidth is candidate bandwidth 1, the measurement results include measurement results 1 to measurement results N. When the first candidate bandwidth is candidate bandwidth 2, the measurement results include measurement results 1 to measurement results N.

[0148] Table 2

[0149] Table 3 illustrates the many-to-one relationship between the first candidate bandwidth and the measurement result. Specifically, in Table 3, when the first candidate bandwidth is candidate bandwidth 1 and candidate bandwidth 2, the measurement result is measurement result 1. When the first candidate bandwidth is candidate bandwidth 2 and candidate bandwidth 3, the measurement result is measurement result 2.

[0150] Table 3

[0151] Table 4 illustrates the many-to-many relationship between the first candidate bandwidth and the measurement results. Specifically, in Table 4, when the first candidate bandwidth is candidate bandwidth 1 and candidate bandwidth 2, the measurement results include measurement result 1 and measurement result 2. When the first candidate bandwidth is candidate bandwidth 2 and candidate bandwidth 3, the measurement results include measurement result 2 and measurement result 3.

[0152] Table 4

[0153] The following example illustrates how to determine the above measurement results.

[0154] Optionally, each of the N measurement results described above is obtained based on a reference signal. As an example, the terminal can measure the reference signal to obtain N measurement results. For instance, the terminal can measure the reference signal multiple times over a period of time to obtain N measurement results. As another example, the network device can measure the reference signal to obtain N measurement results. For instance, the network device can measure the reference signal multiple times over a period of time to obtain N measurement results. In this case, the network device can also send the N measurement results to the terminal. For example, the N measurement results can be carried in the same signaling or different signaling along with the second information described above. This signaling can be RRC signaling, DCI, MAC CE, or other signaling, and is not limited here.

[0155] Among the above N measurement results, each measurement result includes at least one of the following: modulation coding method, modulation order, or signal quality.

[0156] The following example illustrates how the first bandwidth is indicated by the first information.

[0157] Optionally, the first bandwidth can be indicated by different values ​​of the first information or by different values ​​of some bits in the first information. This application does not limit this.

[0158] For example, the first bandwidth can be indicated by at least one bit of the first information, or in other words, the first bandwidth can be indicated by the bit index of the first information. For instance, if the bit index of the first information or the value of at least one bit is 000, the first bandwidth is 48 MHz. If the bit index of the first information or the value of at least one bit is 001, the first bandwidth is 60 MHz, and so on.

[0159] Optionally, the bit index of the first information can belong to M bit indices, where M is a positive integer. In this case, the first bandwidth is the candidate bandwidth corresponding to the bit index of the first information among the M second candidate bandwidths, that is, the terminal can determine the first bandwidth from the M second candidate bandwidths based on the fifth information and the bit index of the first information. As an example, there is a correspondence between the M bit indices and the M second candidate bandwidths, and the terminal can determine the first bandwidth based on this correspondence and the bit index of the first information. As another example, there is a correspondence between the M bit indices, the M second candidate bandwidths, and the M measurement results, and the terminal can determine the first bandwidth based on this correspondence and the bit index of the first information.

[0160] Optionally, the correspondence between the M bit indices and the M second candidate bandwidths, or the correspondence between the M bit indices, the M second candidate bandwidths, and the M measurement results, can be indicated to the terminal by the network device directly or indirectly, or predefined, without limitation here.

[0161] For example, a network device can send fifth information. As one example, the network device learns of N first candidate bandwidths through third information, or the network device learns of N first candidate bandwidths and N measurement results corresponding to the N first candidate bandwidths through third information, and can then send fifth information indicating the correspondence between M second candidate bandwidths and M bit indices. For example, the fifth information includes M second candidate bandwidths, and the network device can notify or indicate the correspondence between the M second candidate bandwidths and the M bit indices through the order of the M second candidate bandwidths in the fifth information, etc. As another example, the network device learns of N first candidate bandwidths and N measurement results corresponding to the N first candidate bandwidths through third information, and can then send fifth information indicating the correspondence between the M second candidate bandwidths, the M bit indices, and the M measurement results. Here, the M second candidate bandwidths belong to the N first candidate bandwidths, and the M measurement results belong to the N measurement results.

[0162] Optionally, the fifth information can be carried in RRC signaling, DCI, MAC CE, or other signaling, without limitation. Here, the RRC signaling can be RRC configuration signaling or other RRC signaling, without limitation. In one possible implementation, when the fifth information is carried in RRC signaling, the fifth information can be called configuration information, such as RRC configuration information.

[0163] Optionally, the M bit indices may have a one-to-one correspondence with at least one of the M second candidate bandwidths and the M measurement results.

[0164] For example, the M second candidate bandwidths are associated one-to-one with the M bit indices in descending or ascending order of the M bit indices. For instance, in Table 5, when the bit index is 000, the second candidate bandwidth is 48MHz. When the bit index is 001, the second candidate bandwidth is 60MHz. When the bit index is 010, the second candidate bandwidth is 36MHz, and so on.

[0165] Table 5

[0166] For example, the M second candidate bandwidths are associated one-to-one with the M bit indices in descending or ascending order of the M bit indices, and the M measurement results are also associated one-to-one with the M bit indices in descending or ascending order of the M bit indices. For instance, in Table 6, when the bit index is 000, the second candidate bandwidth is 48MHz, and the measurement result is measurement result 1. When the bit index is 001, the second candidate bandwidth is 60MHz, and the measurement result is measurement result 2. When the bit index is 010, the second candidate bandwidth is 36MHz, and the measurement result is measurement result 3, and so on.

[0167] Table 6

[0168] For example, the M second candidate bandwidths are associated one-to-one with the M bit indices in descending or ascending order of the M bit indices, and the M measurement results are associated many-to-one with the M bit indices in descending or ascending order of the M bit indices. For instance, in Table 7, when the bit index is 000, the second candidate bandwidth is 48MHz, and the measurement results are measurement result 1 and measurement result 2. When the bit index is 001, the second candidate bandwidth is 60MHz, and the measurement results are measurement result 2 and measurement result 3. When the bit index is 010, the second candidate bandwidth is 36MHz, and the measurement results are measurement result 3 and measurement result 4, and so on.

[0169] Table 7

[0170] The following example illustrates the relationship between PTRS in the first bandwidth and PTRS in the second bandwidth.

[0171] Optionally, the length of the PTRS in the first bandwidth can be different from the length of the PTRS in the second bandwidth. It can also be described as: the PTRS in the first bandwidth and the PTRS in the second bandwidth are different. For ease of distinction, the PTRS in the first bandwidth can be called the first PTRS, and the PTRS in the second bandwidth can be called the second PTRS. The first PTRS and the second PTRS can be different. For example, the first PTRS is shorter than the second PTRS. That is, the first PTRS is a truncated version of the second PTRS. Alternatively, the first PTRS and the second PTRS can be the same. For example, the first PTRS and the second PTRS are both generated from the same sequence, the difference being that the lengths of the first PTRS and the second PTRS are different.

[0172] After step 201, there are two possible implementation methods: Implementation method 1: the terminal transmits PTRS on the first bandwidth; Implementation method 2: the network device transmits PTRS on the first bandwidth. This application does not limit which implementation method is adopted.

[0173] 202. The terminal sends or receives PTRS on the first bandwidth.

[0174] Accordingly, the network device transmits or receives PTRS on the first bandwidth. For example, the terminal transmits PTRS on the first bandwidth, and the network device receives PTRS on the first bandwidth. Alternatively, the terminal receives PTRS on the first bandwidth, and the network device transmits PTRS on the first bandwidth.

[0175] Optionally, the PTRS in the first bandwidth can be used for phase noise suppression. For example, the terminal transmits PTRS on the first bandwidth, thereby enabling the network device to receive PTRS on the first bandwidth and then perform phase noise suppression based on the PTRS in the first bandwidth. Alternatively, the network device transmits PTRS on the first bandwidth, thereby enabling the terminal to receive PTRS on the first bandwidth and then perform phase noise suppression based on the PTRS in the first bandwidth.

[0176] Optionally, the PTRS in the first bandwidth may be mapped onto at least one symbol, and the first DMRS may also be mapped onto at least one symbol.

[0177] Optionally, the third bandwidth used to transmit the first DMRS can be determined based on the first bandwidth and the bandwidth scheduled by the network device for the terminal. For example, the first DMRS is intercepted by the second DMRS based on the first bandwidth, and the second DMRS is determined based on the bandwidth scheduled by the network device for the terminal. Alternatively, the first DMRS is determined based on a fourth bandwidth, which is determined based on the first bandwidth and the bandwidth scheduled by the network device for the terminal, and the fourth bandwidth is not mapped to PTRS.

[0178] The following section, with reference to the accompanying diagram, explains how to generate the first DMRS.

[0179] For example, a terminal or network device can determine a second DMRS based on the bandwidth scheduled for the terminal by the network device, and then intercept the second DMRS based on the first bandwidth to obtain the first DMRS. For instance, the terminal or network device can remove / truncate some elements in the second DMRS based on the first bandwidth to obtain the first DMRS. In this way, the terminal or network device can perform resource element (RE) mapping on the first DMRS.

[0180] For example, in Figure 3, the terminal or network device can determine the bandwidth occupied by the second DMRS based on the bandwidth B_data scheduled by the network device for the terminal. If the granularity is a resource block (RB), the total length of the bandwidth is 12 * B_data REs. Because the second DMRS is a comb mapping, the actual number of REs mapped to the second DMRS needs to be multiplied by the comb factor f_comb. If f_comb = 1 / 2, the length P of the second DMRS is 12 * B_data * 1 / 2, meaning the bandwidth occupied by the second DMRS is 12 * B_data * 1 / 2. Assume the length of the first bandwidth is Q REs, and the second DMRS is [x1, x2, x3, ..., x...]. P Terminals or network devices can block / intercept [x1,x2,x3,…,x] P The second DMRS contains Q / 2 elements. The terminal or network device can remove / truncate any Q / 2 elements in the second DMRS; this application does not limit this.

[0181] For example, a terminal or network device can determine a fourth bandwidth based on a first bandwidth and the bandwidth scheduled by the network device for the terminal, where the fourth bandwidth is not mapped to a PTRS. In this way, the terminal or network device can determine a first DMRS based on the fourth bandwidth, thereby enabling RE mapping of the first DMRS.

[0182] For example, in Figure 4, the terminal or network device can determine the fourth bandwidth based on the first bandwidth and the bandwidth scheduled by the network device for the terminal. Assume the fourth bandwidth includes bandwidth 1 (B_DMRS1), and optionally, it may also include bandwidth 2 (B_DMRS2). Because the second DMRS is a comb mapping, the actual number of REs to be mapped for the DMRS needs to be multiplied by the comb factor f_comb. If f_comb = 1 / 2, the length W of the DMRS mapped to bandwidth 1 is 12 * B_DMRS1 * 1 / 2, and the length Y of the DMRS mapped to bandwidth 2 is 12 * B_DMRS2 * 1 / 2.

[0183] It should be understood that Figure 3 or Figure 4 describes an example of the first DMRS being transmitted through antenna ports 1000, 1001, 1002, and 1003. If there are more antenna ports, the method of mapping DMRS on these antenna ports can refer to the process described in Figure 3 or Figure 4, and will not be elaborated here. The antenna port used to transmit the DMRS can be referred to as the DMRS port. Figure 3 or Figure 4 describes an example of mapping DMRS on a single symbol or two symbols. If there are more symbols, the method of mapping DMRS on these symbols can refer to the process described in Figure 3 or Figure 4, and will not be elaborated here.

[0184] As can be seen, in the above embodiments, PTRS and DMRS can share a common symbol. Thus, when using the PTRS with the same symbol as the DMRS for phase noise estimation, the estimation accuracy of ICI caused by phase noise can be improved, and the CPE caused by phase noise can be reduced, thereby improving the performance of the dual-symbol DMRS in solving OCC in the time domain. Furthermore, it can also reduce ICI caused by phase noise, thereby improving the SINR of the DMRS.

[0185] The method embodiment shown in Figure 2 above includes many possible implementation schemes. Some of these implementation schemes will be illustrated below with reference to either Figure 5 or Figure 6. Any related concepts, operations, or logical relationships not explained in Figure 5 or Figure 6 can be referred to the corresponding descriptions in the embodiments shown in Figure 2, and therefore will not be repeated here.

[0186] Referring to Figure 5, which is a flowchart illustrating another communication method provided in an embodiment of this application, the method includes, but is not limited to, the following steps:

[0187] 501. The network device sends a second message, which indicates a second bandwidth used for PTRS transmission.

[0188] Accordingly, the terminal receives the second information.

[0189] 502. The network device sends PTRS on the second bandwidth.

[0190] Accordingly, the terminal receives PTRS on the second bandwidth.

[0191] 503. The terminal determines the PSD based on the PTRS in the second bandwidth, and determines N first candidate bandwidths based on the PSD. The N first candidate bandwidths include the first bandwidth, and N is a positive integer.

[0192] Following step 503, two options are possible. Option 1 includes steps 504 and 505. Option 2 may include steps 506 to 508. This application does not limit which option to use.

[0193] 504. The terminal sends third information, which is used to indicate N first candidate bandwidths, where N is 1.

[0194] Accordingly, the network device receives third-party information.

[0195] 505. The network device sends first information, which indicates the first bandwidth, and the first bandwidth is used to transmit PTRS.

[0196] Accordingly, the terminal receives the first information.

[0197] 506. The terminal sends third information, which is used to indicate N first candidate bandwidths and N measurement results corresponding to the N first candidate bandwidths, where N is an integer greater than 1.

[0198] Accordingly, the network device receives third-party information.

[0199] 507. The network device sends a fifth message, which is used to indicate the correspondence between M second candidate bandwidths and M bit indices, or the fifth message is used to indicate the correspondence between M second candidate bandwidths, M bit indices and M measurement results, where the M second candidate bandwidths belong to N first candidate bandwidths and the M measurement results belong to N measurement results.

[0200] Accordingly, the terminal receives the fifth piece of information.

[0201] 508. The terminal receives the first information, the bit index of the first information belongs to M bit indices, and determines the first bandwidth from M second candidate bandwidths based on the fifth information and the bit index of the first information. The first bandwidth is used to transmit PTRS.

[0202] Accordingly, the network device sends the first message.

[0203] 509. The network device sends PTRS on the first bandwidth.

[0204] Accordingly, the terminal receives PTRS on the first bandwidth.

[0205] As can be seen from the above embodiments, the first bandwidth is determined by the terminal based on the PSD. This means that the first bandwidth used for transmitting or receiving PTRS can match the actual channel conditions, such as the current phase noise level. This ensures phase noise error compensation performance and improves demodulation performance when using PTRS within the first bandwidth for phase noise suppression. Simultaneously, it reduces the overhead of frequency domain resource allocation and improves spectral efficiency.

[0206] Referring to Figure 6, which is a flowchart illustrating another communication method provided in an embodiment of this application, the method includes, but is not limited to, the following steps:

[0207] 601. The network device sends a second message, which indicates a second bandwidth used for PTRS transmission.

[0208] Accordingly, the terminal receives the second information.

[0209] 602. The terminal sends PTRS on the second bandwidth.

[0210] Accordingly, the network equipment receives PTRS on the second bandwidth.

[0211] 603. The network device determines the PSD based on the PTRS in the second bandwidth, and determines N first candidate bandwidths based on the PSD. The N first candidate bandwidths include the first bandwidth, and N is a positive integer.

[0212] Following step 603, two options are possible. Option 1 includes step 604. Option 2 may include steps 605 and 606. This application does not specify which option to use.

[0213] 604. The network device sends first information, which is used to indicate the first bandwidth, and the first bandwidth is used to transmit PTRS.

[0214] Accordingly, the terminal receives the first information.

[0215] 605. The network device sends a fifth message, which indicates the correspondence between the M second candidate bandwidths and the M bit indices, and the M second candidate bandwidths belong to the N first candidate bandwidths.

[0216] Accordingly, the terminal receives the fifth piece of information.

[0217] 606. The terminal receives the first information, the bit index of the first information belongs to M bit indices, and determines the first bandwidth from M second candidate bandwidths based on the fifth information and the bit index of the first information. The first bandwidth is used to transmit PTRS.

[0218] Accordingly, the network device sends the first message.

[0219] 607. The network device sends PTRS on the first bandwidth.

[0220] Accordingly, the terminal receives PTRS on the first bandwidth.

[0221] As can be seen from the above embodiments, the first bandwidth is determined by the network device based on the PSD. This means that the first bandwidth used for transmitting or receiving PTRS can match the actual channel conditions, such as the current phase noise level. This ensures phase noise error compensation performance and improves demodulation performance when using PTRS within the first bandwidth for phase noise suppression. Simultaneously, it reduces the overhead of frequency domain resource allocation and improves spectral efficiency.

[0222] Referring to Figure 7, which is a flowchart illustrating another communication method provided in an embodiment of this application, the method includes, but is not limited to, the following steps:

[0223] 701. The network device sends a sixth message, which indicates a fifth bandwidth used to transmit PTRS. The PTRS in the fifth bandwidth is mapped on at least one symbol, and the third DMRS is also mapped on at least one symbol.

[0224] Accordingly, the terminal receives the sixth piece of information.

[0225] For example, the sixth information can be carried in RRC signaling, DCI, MAC CE, or other signaling, without limitation. Here, RRC signaling can be RRC reconfiguration signaling or other RRC signaling, without limitation. In one possible implementation, when the sixth information is carried in RRC signaling, the sixth information can be called configuration information, such as RRC reconfiguration information. When the sixth information is carried in DCI signaling, DCI can also schedule the terminal to receive data, etc., without limitation in this application.

[0226] The way the sixth information indicates the fifth bandwidth can be referred to the way the first information indicates the first bandwidth in Figure 2, and will not be elaborated here.

[0227] The method for determining the fifth bandwidth is described below.

[0228] As an example, the fifth bandwidth can be an existing bandwidth and / or a newly defined bandwidth. The existing bandwidth can be the bandwidth used for PTRS transmission in an existing version of the communication standard, while the newly defined bandwidth can be the bandwidth used for PTRS transmission in a future communication standard. Alternatively, the fifth bandwidth can be determined by the terminal or network device based on the PSD. The process involved in 'the fifth bandwidth being determined by the terminal or network device based on the PSD' can be referred to the relevant descriptions in Figures 2, 5, or 6, and will not be elaborated upon here.

[0229] As an example, the fifth bandwidth can be a predefined bandwidth.

[0230] The relationship between the fifth bandwidth and the sixth bandwidth used to transmit the third DMRS is illustrated below with an example.

[0231] Optionally, the sixth bandwidth used to transmit the third DMRS can be determined based on the fifth bandwidth and the bandwidth scheduled by the network device for the terminal. For example, the third DMRS is obtained by intercepting the second DMRS based on the fifth bandwidth, and the second DMRS is determined based on the bandwidth scheduled by the network device for the terminal. Alternatively, the third DMRS is determined based on the seventh bandwidth, which is determined based on the fifth bandwidth and the bandwidth scheduled by the network device for the terminal, and the seventh bandwidth is not mapped to PTRS. The method by which the terminal or network device generates the third DMRS can be referred to Figure 3 or Figure 4 above, and will not be elaborated here.

[0232] After step 701, there are two possible implementation methods: Implementation method 1: the terminal transmits PTRS on the fifth bandwidth; Implementation method 2: the network device transmits PTRS on the fifth bandwidth. This application does not limit which implementation method is adopted.

[0233] 702. The terminal sends or receives PTRS on the fifth bandwidth.

[0234] Accordingly, network devices transmit or receive PTRS on the fifth bandwidth. For example, a terminal transmits PTRS on the fifth bandwidth, and a network device receives PTRS on the fifth bandwidth. Alternatively, a terminal receives PTRS on the fifth bandwidth, and a network device transmits PTRS on the fifth bandwidth.

[0235] Optionally, the PTRS in the fifth bandwidth can be used for phase noise suppression. For example, the terminal transmits PTRS on the fifth bandwidth, enabling the network device to receive PTRS on the fifth bandwidth, and thus perform phase noise suppression based on the PTRS in the fifth bandwidth. Alternatively, the network device transmits PTRS on the fifth bandwidth, enabling the terminal to receive PTRS on the fifth bandwidth, and thus perform phase noise suppression based on the PTRS in the fifth bandwidth.

[0236] As can be seen, in the above embodiments, PTRS and DMRS can share a common symbol. Thus, when using the PTRS with the same symbol as the DMRS for phase noise estimation, the estimation accuracy of ICI caused by phase noise can be improved, and the CPE caused by phase noise can be reduced, thereby improving the performance of the dual-symbol DMRS in solving OCC in the time domain. Furthermore, it can also reduce ICI caused by phase noise, thereby improving the SINR of the DMRS.

[0237] It is understood that, in order to achieve the aforementioned functions, the device includes corresponding hardware structures and / or software modules for performing each function. Those skilled in the art should readily recognize that, based on the units and algorithm steps of the examples described in conjunction with the embodiments disclosed herein, this application can be implemented in hardware or a combination of hardware and computer software. Whether a function is executed in hardware or by computer software driving hardware depends on the specific application and design constraints of the technical solution. Those skilled in the art can use different methods to implement the described functions for each specific application, but such implementation should not be considered beyond the scope of this application.

[0238] This application embodiment can divide the terminal or network device into functional modules according to the above method examples. For example, each function can be divided into its own functional modules, or two or more functions can be integrated into one processing module. The integrated module can be implemented in hardware or as a software functional module. It should be noted that the module division in this application embodiment is illustrative and only represents one logical functional division. In actual implementation, there may be other division methods.

[0239] Referring to Figure 8, which is a schematic diagram of a communication device provided in an embodiment of this application, the communication device 800 can be applied to the methods shown in any of the embodiments illustrated in Figures 2 to 7. As shown in Figure 8, the communication device 800 includes a processing module 801 and a transceiver module 802. The processing module 801 may be one or more processors, and the transceiver module 802 may be a transceiver or a communication interface. The communication device can be used to implement the terminal or network device involved in any of the above method embodiments, or to implement the functions of the network element involved in any of the above method embodiments. The network element or network function may be a network component in a hardware device, a software function running on dedicated hardware, or a virtualization function instantiated on a platform (e.g., a cloud platform). Optionally, the communication device 800 may also include a storage module 803 for storing the program code and data of the communication device 800. It should be understood that regardless of whether these functional modules are subdivided or combined, the general flow performed by the communication device 800 in implementing any of the above method embodiments is the same. For example, the transceiver module 802 in the aforementioned communication device 800 may include a receiving module and / or a transmitting module. Of course, the transceiver module may also be called a communication module. In one implementation, each module may have its own program code (or program instructions). When the program code corresponding to each module is run on the processor, it causes the unit to execute the corresponding process to achieve the corresponding function.

[0240] In one example, the communication device functions as a terminal or as a chip applied within a terminal, i.e., a chip used in a terminal, and executes the steps performed by the terminal in the above method embodiments. The transceiver module 802 is used to specifically execute the sending and / or receiving actions performed by the terminal in any of the embodiments shown in Figures 2 to 7, for example, supporting the terminal in performing other processes of the technology described herein. The processing module 801 can be used to support the communication device 800 in performing the processing actions in the above method embodiments, for example, supporting the terminal in performing other processes of the technology described herein.

[0241] For example, transceiver module 802 is configured to: receive first information, the first information indicating a first bandwidth, the first bandwidth being used to transmit PTRS, the first bandwidth being determined based on the PSD of PTRS; and transmit or receive PTRS on the first bandwidth.

[0242] Optionally, the transceiver module 802 is further configured to: receive second information, the second information being used to indicate a second bandwidth, the second bandwidth being used to transmit PTRS; transmit or receive PTRS on the second bandwidth, the PTRS in the second bandwidth being used to determine PSD, the PSD being used to determine N first candidate bandwidths, the N first candidate bandwidths including the first bandwidth, where N is a positive integer.

[0243] Optionally, the transceiver module 802 is also used to send third information, which is used to indicate N first candidate bandwidths.

[0244] Optionally, the transceiver module 802 is further configured to receive fourth information, which indicates at least one of the following: the modulation and coding scheme scheduled by the network device for the terminal, the modulation order scheduled by the network device for the terminal, the bandwidth scheduled by the network device for the terminal, or the number of spatial streams scheduled by the network device for the terminal. The fourth information and the PSD are used to determine N first candidate bandwidths.

[0245] Optionally, the transceiver module 802 is further configured to receive fifth information, which indicates the correspondence between the M second candidate bandwidths and the M bit indices, or the fifth information indicates the correspondence between the M second candidate bandwidths, the M bit indices, and the M measurement results. Wherein, the M second candidate bandwidths belong to the N first candidate bandwidths, the M measurement results belong to the N measurement results, the bit index of the first information belongs to the M bit indices, and the first bandwidth is the candidate bandwidth corresponding to the bit index of the first information among the M second candidate bandwidths.

[0246] For example, transceiver module 802 is configured to: receive sixth information indicating a fifth bandwidth for transmitting PTRS; and transmit or receive PTRS on the fifth bandwidth, wherein the PTRS in the fifth bandwidth is mapped onto at least one symbol, and at least one symbol is also mapped onto a third DMRS.

[0247] In one example, when the communication device functions as a network device or as a chip applied within a network device (i.e., a chip used in a network device), it executes the steps performed by the network device in the above method embodiments. The transceiver module 802 is used to specifically execute the sending and / or receiving actions performed by the network device in any of the embodiments shown in Figures 2 to 7, for example, supporting the network device in performing other processes of the technology described herein. The processing module 801 can be used to support the communication device 800 in performing the processing actions in the above method embodiments, for example, supporting the network device in performing other processes of the technology described herein.

[0248] For example, transceiver module 802 is configured to: send first information, the first information indicating a first bandwidth, the first bandwidth being used to transmit PTRS, the first bandwidth being determined based on the PSD of PTRS; and send or receive PTRS on the first bandwidth.

[0249] Optionally, the transceiver module 802 is further configured to: send second information, the second information being used to indicate a second bandwidth, the second bandwidth being used to transmit PTRS; send or receive PTRS on the second bandwidth, the PTRS in the second bandwidth being used to determine PSD, the PSD being used to determine N first candidate bandwidths, the N first candidate bandwidths including the first bandwidth, where N is a positive integer.

[0250] Optionally, the transceiver module 802 is also used to receive third information, which is used to indicate N first candidate bandwidths.

[0251] Optionally, the transceiver module 802 is further configured to transmit fourth information, which indicates at least one of the following: the modulation and coding scheme scheduled by the network device for the terminal, the modulation order scheduled by the network device for the terminal, the bandwidth scheduled by the network device for the terminal, or the number of spatial streams scheduled by the network device for the terminal. The fourth information and the PSD are used to determine N first candidate bandwidths.

[0252] Optionally, the transceiver module 802 is further configured to transmit fifth information, which indicates the correspondence between the M second candidate bandwidths and the M bit indices, or the fifth information indicates the correspondence between the M second candidate bandwidths, the M bit indices, and the M measurement results. Wherein, the M second candidate bandwidths belong to the N first candidate bandwidths, the M measurement results belong to the N measurement results, the bit index of the first information belongs to the M bit indices, and the first bandwidth is the candidate bandwidth corresponding to the bit index of the first information among the M second candidate bandwidths.

[0253] For example, transceiver module 802 is configured to: send a sixth message indicating a fifth bandwidth for transmitting PTRS; and send or receive PTRS on the fifth bandwidth, wherein the PTRS in the fifth bandwidth is mapped on at least one symbol, and at least one symbol is also mapped to a third DMRS.

[0254] In one possible implementation, when the aforementioned device is a chip, such as a modem chip, a system-on-chip (SoC) chip containing a modem core, or a system-in-package (SIP) chip; or, when the aforementioned device is a communication module, the transceiver module 802 can be a communication interface, pins, or circuits. The communication interface can be used to input data to be processed to the processor and can output the processor's processing results. Specifically, the communication interface can be a general-purpose input / output (GPIO) interface, which can connect to multiple peripheral devices (such as a liquid crystal display (LCD), camera, radio frequency (RF) module, antenna, etc.). The communication interface is connected to the processor via a bus.

[0255] The processing module 801 can be a processing circuit, which can be one or more processors, or all or part of the circuitry in one or more processors used for control and / or processing. The processing circuit or processor can execute computer execution instructions stored in the storage module to cause the chip to execute the methods involved in any of the embodiments shown in Figures 2 to 7. Further, the processor can include a controller, an arithmetic logic unit (ALU), and registers. For example, the controller is mainly responsible for instruction decoding and issuing control signals for the operations corresponding to the instructions. The ALU is mainly responsible for performing fixed-point or floating-point arithmetic operations, shift operations, and logical operations, and can also perform address operations and conversions. The registers are mainly responsible for storing register operands and intermediate operation results temporarily stored during instruction execution. In specific implementations, the processor's hardware architecture can be an application-specific integrated circuit (ASIC) architecture, a microprocessor without interlocked piped stages architecture (MIPS) architecture, an advanced reduced instruction set machine (RISC) machine (ARM) architecture, or a network processor (NP) architecture, etc. The processor can be single-core or multi-core. The storage module can be an internal storage module of the chip, such as a register or cache. Alternatively, the storage module can be an external storage module, such as read-only memory (ROM) or other types of static storage devices that can store static information and instructions, or random access memory (RAM).

[0256] It should be noted that the functions of the processor and interface can be implemented through hardware design, software design, or a combination of hardware and software; no restrictions are imposed here.

[0257] Figure 9 is a schematic diagram of another communication device provided in an embodiment of this application. It is understood that the communication device 910 includes necessary means such as modules, units, elements, circuits, or interfaces, appropriately configured together to execute this solution. The communication device 910 can be the aforementioned terminal or network device, or a component (e.g., a chip) within these devices, used to implement the methods described in the above method embodiments. The communication device 910 includes one or more processors 911. The processor 911 can be a general-purpose processor or a dedicated processor, for example, a baseband processor or a central processing unit. The baseband processor can be used to process communication protocols and communication data, while the central processing unit can be used to control the communication device (e.g., a terminal, network device, or chip), execute software programs, and process data from the software programs.

[0258] Optionally, in one design, the processor 911 may include a program 913 (sometimes also referred to as code or instructions), which can be executed on the processor 911 to cause the communication device 910 to perform the methods described in the above embodiments. In yet another possible design, the communication device 910 includes circuitry (not shown in FIG. 9) for implementing the terminal, network device, and other functions described in the above embodiments. Optionally, the communication device 910 may include one or more memories 912 storing a program 914 (sometimes also referred to as code or instructions), which can be executed on the memory 912 to cause the communication device 910 to perform the methods described in the above method embodiments.

[0259] Optionally, data may also be stored in the processor 911 and / or the memory 912. The processor and memory may be configured separately or integrated together.

[0260] Optionally, if the communication device 910 is a terminal or network device, it may also include a transceiver 915 and / or an antenna 916. The processor 911, sometimes referred to as a processing unit, controls the communication device (e.g., a terminal or network device). The transceiver 915, sometimes referred to as a transceiver unit, transceiver, or transceiver circuit, is used to implement the transmission and reception functions of the communication device via the antenna 916. Optionally, the transceiver 915 may include a receiver and / or a transmitter. The receiver may be referred to as a receiving unit, receiver, or receiving circuit. The transmitter may be referred to as a transmitting unit, transmitter, or transmitting circuit.

[0261] Optionally, if the communication device 910 is a chip for a terminal or network device, the transceiver 915 can be a transceiver circuit, such as an input / output interface or a transceiver interface.

[0262] This application also provides a communication device, which includes at least one processor; wherein the at least one processor is configured to perform the method described in any one of the embodiments shown in FIG2 to FIG7.

[0263] This application also provides a computer-readable storage medium storing computer instructions that, when executed, cause the computer to perform the method described in any of the embodiments shown in Figures 2 to 7.

[0264] This application also provides a computer program product, which includes computer program code. When the computer program code is run, it causes the computer to perform the method described in any one of the embodiments shown in Figures 2 to 7.

[0265] This application also provides a chip, which includes at least one processor and an interface. The processor is used to read and execute instructions stored in a memory. When the instructions are executed, the chip causes the chip to perform the method described in any one of the embodiments shown in Figures 2 to 7.

[0266] Optionally, the processing performed by a single execution entity (terminal or network device) shown in any of the above embodiments can also be divided into multiple execution entities, which can be logically and / or physically separated. For example, the processing performed by the network device can be divided into execution by at least one of CU, DU, and RU.

[0267] Furthermore, the various embodiments of this application are merely illustrative examples of executing all the steps included, and should not be considered as specific limitations on this application. For example, the order of steps in various embodiments can be simply changed according to their function and internal logic; or, for example, all steps in various embodiments can be executed, or only a portion of them can be executed, as long as the same function as in the embodiments of this application can be achieved.

[0268] In this application, "send" and "receive" indicate the direction of signal transmission. For example, "send information to a network device" can be understood as the destination of the information being the network device, which can include direct transmission via the air interface or indirect transmission via the air interface from other units or modules. "Receive information from a network device" can be understood as the source of the information being the network device, which can include direct reception from the network device via the air interface or indirect reception from the network device via the air interface from other units or modules. "Send" can also be understood as the "output" of the chip interface, and "receive" can also be understood as the "input" of the chip interface.

[0269] In other words, sending and receiving can occur between devices, such as between network devices and terminals; or they can occur within a device, such as between components, modules, chips, software modules, or hardware modules within a device via a bus, wiring, or interface.

[0270] In the embodiments of this application, "when," "if," "if," and "in the case of" all refer to the device making corresponding processing under certain objective circumstances, and are not limited to a time, nor do they require the device to perform a judgment action when it is implemented, nor do they imply any other limitations.

[0271] In this application, the words “example,” “exemplarily,” “for example,” or “such as” are used to indicate that something is an example, illustration, or description. Any embodiment or design described as “example,” “exemplarily,” “for example,” or “such as” in this application should not be construed as being more preferred or advantageous than other embodiments or designs. Specifically, the use of the words “example,” “exemplarily,” “for example,” or “such as” is intended to present the relevant concepts in a specific manner.

[0272] The above description is merely a specific embodiment of this application, but the scope of protection of this application is not limited thereto. Any variations or substitutions that can be easily conceived by those skilled in the art within the scope of the technology disclosed in this application should be included within the scope of protection of this application. Therefore, the scope of protection of this application should be determined by the scope of the claims.

Claims

1. A communication method characterized by comprising: include: Receive first information, the first information is used to indicate a first bandwidth, the first bandwidth is used to transmit a phase tracking reference signal PTRS, and the first bandwidth is determined based on the phase noise power spectral density of the PTRS; Transmit or receive the PTRS on the first bandwidth.

2. The method of claim 1, wherein, The method further includes: Receive second information, the second information being used to indicate a second bandwidth, the second bandwidth being used to transmit the PTRS; The PTRS is transmitted or received on the second bandwidth, the PTRS in the second bandwidth is used to determine the phase noise power spectral density, the phase noise power spectral density is used to determine N first candidate bandwidths, the N first candidate bandwidths include the first bandwidth, and N is a positive integer.

3. The method of claim 2, wherein, The method further includes: Send a third message, which is used to indicate the N first candidate bandwidths.

4. The method of claim 2, wherein, The second bandwidth is determined based on the maximum measurement bandwidth supported by the terminal and / or the bandwidth scheduled for the terminal by the network device, wherein the maximum measurement bandwidth supported by the terminal is the bandwidth for measuring phase noise by the terminal.

5. The method according to any one of claims 2-4, characterized in that, The method further includes: Receive fourth information, the fourth information being used to indicate at least one of the following: the modulation and coding scheme scheduled by the network device for the terminal, the modulation order scheduled by the network device for the terminal, the bandwidth scheduled by the network device for the terminal, or the number of spatial streams scheduled by the network device for the terminal; The fourth information and the phase noise power spectral density are used to determine the N first candidate bandwidths.

6. The method of claim 3, wherein, The third information is also used to indicate the N measurement results corresponding to the N first candidate bandwidths, each of the N measurement results being obtained based on a reference signal, and each of the N measurement results including at least one of the following: modulation coding method, modulation order, or signal quality.

7. The method according to any one of claims 2-6, characterized in that, The method further includes: Receive fifth information, the fifth information being used to indicate the correspondence between M second candidate bandwidths and M bit indices, or the fifth information being used to indicate the correspondence between M second candidate bandwidths, M bit indices, and M measurement results; Wherein, the M second candidate bandwidths belong to the N first candidate bandwidths, the M measurement results belong to the N measurement results, the bit index of the first information belongs to the M bit indices, and the first bandwidth is the candidate bandwidth corresponding to the bit index of the first information among the M second candidate bandwidths.

8. The method according to any one of claims 1 to 7, characterized in that, The PTRS in the first bandwidth is mapped onto at least one symbol, and the at least one symbol is also mapped onto a first demodulation reference signal DMRS.

9. The method of claim 8, wherein, The third bandwidth used to transmit the first DMRS is determined based on the first bandwidth and the bandwidth scheduled by the network device for the terminal.

10. The method according to claim 8 or 9, characterized in that, The first DMRS intercepts the second DMRS based on the first bandwidth, and the second DMRS is determined based on the bandwidth scheduled by the network device for the terminal; or... The first DMRS is determined based on a fourth bandwidth, which is determined based on the first bandwidth and the bandwidth scheduled by the network device for the terminal. The fourth bandwidth is not mapped to the PTRS.

11. A communication method characterized by comprising: include: Send first information, the first information being used to indicate a first bandwidth, the first bandwidth being used to transmit a phase tracking reference signal PTRS, the first bandwidth being determined based on the phase noise power spectral density of the PTRS; Transmit or receive the PTRS on the first bandwidth.

12. The method of claim 11, wherein, The transmission of the first information, which indicates the first bandwidth, includes: Send a second message, the second message being used to indicate a second bandwidth, the second bandwidth being used to transmit the PTRS; The PTRS is transmitted or received on the second bandwidth, the PTRS in the second bandwidth is used to determine the phase noise power spectral density, the phase noise power spectral density is used to determine N first candidate bandwidths, the N first candidate bandwidths include the first bandwidth, and N is a positive integer.

13. The method of claim 12, wherein, The method further includes: Receive third information, which is used to indicate the N first candidate bandwidths.

14. The method of claim 12, wherein, The second bandwidth is determined based on the maximum measurement bandwidth supported by the terminal and / or the bandwidth scheduled for the terminal by the network device, wherein the maximum measurement bandwidth supported by the terminal is the bandwidth for measuring phase noise by the terminal.

15. The method according to any one of claims 12-14, characterized in that, The method further includes: Send a fourth message, the fourth message being used to indicate at least one of the following: the modulation and coding scheme scheduled by the network device for the terminal, the modulation order scheduled by the network device for the terminal, the bandwidth scheduled by the network device for the terminal, or the number of spatial streams scheduled by the network device for the terminal; The fourth information and the phase noise power spectral density are used to determine the N first candidate bandwidths.

16. The method of claim 13, wherein, The third information is also used to indicate the N measurement results corresponding to the N first candidate bandwidths, each of the N measurement results being obtained based on a reference signal, and each of the N measurement results including at least one of the following: modulation coding method, modulation order, or signal quality.

17. The method according to any of claims 12-16, characterized by, The method further includes: Send a fifth message, which is used to indicate the correspondence between M second candidate bandwidths and M bit indices, or the fifth message is used to indicate the correspondence between M second candidate bandwidths, M bit indices and M measurement results; Wherein, the M second candidate bandwidths belong to the N first candidate bandwidths, the M measurement results belong to the N measurement results, the bit index of the first information belongs to the M bit indices, and the first bandwidth is the candidate bandwidth corresponding to the bit index of the first information among the M second candidate bandwidths.

18. The method of any of claims 12-17, wherein, The PTRS in the first bandwidth is mapped onto at least one symbol, and the at least one symbol is also mapped onto a first demodulation reference signal DMRS.

19. The method of claim 18, wherein, The third bandwidth used to transmit the first DMRS is determined based on the first bandwidth and the bandwidth scheduled by the network device for the terminal.

20. The method according to claim 18 or 19, characterized in that, The first DMRS intercepts the second DMRS based on the first bandwidth, and the second DMRS is determined based on the bandwidth scheduled by the network device for the terminal; or... The first DMRS is determined based on the fourth bandwidth, which is determined based on the first bandwidth and the bandwidth scheduled by the network device for the terminal. The fourth bandwidth is not mapped to PTRS.

21. A method of communication, comprising: include: Receive sixth information, the sixth information indicating a fifth bandwidth, the fifth bandwidth being used to transmit the phase tracking reference signal PTRS; The PTRS is transmitted or received on the fifth bandwidth, wherein the PTRS in the fifth bandwidth is mapped on at least one symbol, and the at least one symbol is also mapped to a third demodulation reference signal DMRS.

22. The method of claim 21, wherein, The sixth bandwidth used to transmit the third DMRS is determined based on the fifth bandwidth and the bandwidth scheduled by the network device for the terminal.

23. The method according to claim 21 or 22, characterized in that, The third DMRS is obtained by intercepting the second DMRS based on the fifth bandwidth, and the second DMRS is determined based on the bandwidth scheduled by the network device for the terminal; or... The third DMRS is determined based on the seventh bandwidth, which is determined based on the fifth bandwidth and the bandwidth used by the network device for terminal scheduling. The seventh bandwidth is not mapped to the PTRS.

24. A method of communication, comprising: include: Send a sixth message, the sixth message indicating a fifth bandwidth, the fifth bandwidth being used to transmit the Phase Tracking Reference Signal (PTRS); The PTRS is transmitted or received on the fifth bandwidth, wherein the PTRS in the fifth bandwidth is mapped on at least one symbol, and the at least one symbol is also mapped to a demodulation reference signal DMRS.

25. The method of claim 24, wherein, The sixth bandwidth used to transmit the third DMRS is determined based on the fifth bandwidth and the bandwidth scheduled by the network device for the terminal.

26. The method of claim 24 or 25, wherein, The third DMRS is obtained by intercepting the second DMRS based on the fifth bandwidth, and the second DMRS is determined based on the bandwidth scheduled by the network device for the terminal; or... The third DMRS is determined based on the seventh bandwidth, which is determined based on the fifth bandwidth and the bandwidth used by the network device for terminal scheduling. The seventh bandwidth is not mapped to the PTRS.

27. A communications device, characterized by It includes units or modules for implementing the method as described in any one of claims 1-10, or units or modules for implementing the method as described in any one of claims 11-20, or units or modules for implementing the method as described in any one of claims 21-23, or units or modules for implementing the method as described in any one of claims 24-26.

28. A communications device, characterized by The communication device includes at least one processor; wherein the at least one processor is configured to cause the communication device to perform the method of any one of claims 1-10, or, the at least one processor is configured to cause the communication device to perform the method of any one of claims 11-20, or, the at least one processor is configured to cause the communication device to perform the method of any one of claims 21-23, or, the at least one processor is configured to cause the communication device to perform the method of any one of claims 24-26.

29. A computer-readable storage medium, characterized in that, The computer-readable storage medium stores computer instructions or programs that, when executed, cause the computer to perform the method as claimed in any one of claims 1-10, or cause the computer to perform the method as claimed in any one of claims 11-20, or cause the computer to perform the method as claimed in any one of claims 21-23, or cause the computer to perform the method as claimed in any one of claims 24-26.

30. A computer program product, characterised in that, The computer program product includes: a computer program that, when run by a computer, causes the computer to perform the method as described in any one of claims 1-10, or causes the computer to perform the method as described in any one of claims 11-20, or causes the computer to perform the method as described in any one of claims 21-23, or causes the computer to perform the method as described in any one of claims 24-26.

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