Communication method and apparatus, communication device, and storage medium

Abstract

Embodiments of the present disclosure provide a communication method and apparatus, a communication device, and a storage medium. The method comprises: sending configuration information, the configuration information being used for indicating the number of downlink phase tracking reference signal (PTRS) ports, and a downlink PTRS being used for estimating and compensating for phase noise (PN) generated by a local oscillator used by at least one radio frequency chain, thereby achieving accurate estimation of and compensation for phase noise.

Description

Communication method and device, communication equipment and storage medium Technical Field

[0001] The present disclosure relates to the field of communication technology, and in particular to a communication method and apparatus, a communication device, and a storage medium. Background Art

[0002] The millimeter wave band offers enormous bandwidth, high transmission rates, and short wavelengths, facilitating the integration of antenna components. These advantages have made millimeter wave wireless communication technology a hot topic. However, millimeter waves also have significant drawbacks, such as being easily obstructed by obstacles and being extremely sensitive to phase noise (PN).

[0003] Summary of the Invention

[0004] Under different local oscillator architectures, network equipment indicates the number of downlink phase tracking reference signal (PTRS) ports to the terminal, enabling the terminal to determine the corresponding PTRS time-frequency domain density configuration based on the number of PTRS ports, thereby achieving accurate PN estimation and compensation, and improving the overall system performance.

[0005] According to a first aspect of an embodiment of the present disclosure, a communication method is provided, which is performed by a network device, the method comprising: sending configuration information, the configuration information being used to indicate the number of downlink PTRS ports, the downlink PTRS being used to estimate and compensate for a PN generated by a local oscillator used by at least one RF chain.

[0006] According to a second aspect of an embodiment of the present disclosure, a communication method is provided, which is executed by a terminal, and the method includes: receiving configuration information, where the configuration information is used to indicate the number of downlink PTRS ports; based on the number of downlink PTRS ports, determining the time-frequency domain density configuration of the downlink PTRS; wherein the downlink PTRS is used to estimate and compensate for the PN generated by the local oscillator used by at least one RF chain.

[0007] According to a third aspect of an embodiment of the present disclosure, a communication device is provided that can be applied to a network device. The communication device includes: a sending module configured to send configuration information, the configuration information being used to indicate the number of downlink PTRS ports, and the downlink PTRS being used to estimate and compensate for the PN generated by a local oscillator used by at least one RF chain.

[0008] According to a fourth aspect of an embodiment of the present disclosure, a communication device is provided, which can be applied to a terminal, and the communication device includes: a receiving module, configured to receive configuration information, where the configuration information is used to indicate the number of downlink PTRS ports; a processing module, configured to determine the time-frequency domain density configuration of the downlink PTRS based on the number of downlink PTRS ports; wherein the downlink PTRS is used to estimate and compensate for the PN generated by the local oscillator used by at least one RF chain.

[0009] According to a fifth aspect of the embodiments of the present disclosure, a communication device, such as a network device or a terminal, is provided. The communication device includes: at least one processor; and a memory coupled to the at least one processor, the memory storing executable instructions that, when executed by the at least one processor, cause the communication device to perform the method described in any one of the first and second aspects and their embodiments.

[0010] According to a sixth aspect of the embodiments of the present disclosure, a storage medium is provided, wherein instructions are stored in the storage medium, and when the instructions are executed in a communication device, the communication device executes the method as described in any one of the first aspect, the second aspect, and the embodiments thereof.

[0011] The storage medium stores instructions, which, when executed by a processor, perform the method according to any one of the first aspect, the second aspect, and the embodiments thereof.

[0012] According to a seventh aspect of the embodiments of the present disclosure, a computer program or computer program product is provided. The computer program or computer program product includes code. When the instructions are executed by a processor, the method as described in any one of the first aspect, the second aspect, and the embodiments thereof is performed.

[0013] The embodiments of the present disclosure can achieve accurate estimation and compensation of PN.

[0014] It should be understood that the above general description and the following detailed description are merely exemplary and explanatory and do not constitute limitations on the embodiments of the present disclosure. BRIEF DESCRIPTION OF THE DRAWINGS

[0015] The accompanying drawings, which are incorporated in and constitute a part of this specification, illustrate embodiments consistent with the present invention and, together with the description, serve to explain the principles of the embodiments of the present invention.

[0016] FIG1 is a schematic diagram of an architecture of a communication system provided according to an embodiment of the present disclosure.

[0017] FIG2 is a schematic diagram of an OFDM system affected by PN in a centralized local oscillator architecture according to an embodiment of the present disclosure.

[0018] FIG3 is a schematic diagram of an OFDM system affected by PN in a distributed local oscillator architecture according to an embodiment of the present disclosure.

[0019] FIG4 is an exemplary interaction diagram of a communication method provided according to an embodiment of the present disclosure.

[0020] FIG5A is a schematic structural diagram of a network device provided according to an embodiment of the present disclosure.

[0021] FIG5B is another schematic diagram of the structure of a network device provided according to an embodiment of the present disclosure.

[0022] FIG6 is an exemplary flowchart of a communication method performed on a network device side according to an embodiment of the present disclosure.

[0023] FIG7 is an exemplary flowchart of a method for executing communication on a terminal side according to an embodiment of the present disclosure.

[0024] FIG8 is an exemplary structural diagram of a communication device provided according to an embodiment of the present disclosure.

[0025] FIG9 is a schematic structural diagram of a communication device provided according to an embodiment of the present disclosure. DETAILED DESCRIPTION

[0026] Embodiments of the present disclosure provide a communication method and apparatus, a communication device, and a storage medium.

[0027] In a first aspect, the present disclosure provides a communication method, which is performed by a network device. The method includes: sending configuration information, where the configuration information is used to indicate the number of downlink PTRS ports, and the downlink PTRS is used to estimate and compensate for the PN generated by the local oscillator used by at least one RF chain.

[0028] In the disclosed embodiments, the network device indicates the number of downlink PTRS ports to the terminal, enabling the terminal to determine the corresponding downlink PTRS time-frequency density configuration based on the number of downlink PTRS ports. This time-frequency density configuration is more conducive to the terminal accurately estimating and compensating for PN, thereby improving overall system performance.

[0029] In combination with some embodiments of the first aspect, in some embodiments, the configuration information includes at least one of the following: the maximum number of downlink PTRS ports; the number of transmission configuration indication (TCI) states; the number of code division multiplexing (CDM) groups corresponding to the demodulation reference signal (DMRS) ports.

[0030] In combination with some embodiments of the first aspect, in some embodiments, sending configuration information includes at least one of the following: sending downlink PTRS configuration information, the downlink PTRS configuration information includes the maximum number of downlink PTRS ports and / or the number of CDM groups corresponding to the DMRS ports; sending downlink control information (downlink control information, DCI), DCI is used to indicate the number of TCI states.

[0031] In combination with some embodiments of the first aspect, in some embodiments, the number of downlink PTRS ports is 1 or N, where N is an integer greater than or equal to 2.

[0032] In combination with some embodiments of the first aspect, in some embodiments, when the maximum number of downlink PTRS ports is configured to be 1, the number of downlink PTRS ports is 1.

[0033] In combination with some embodiments of the first aspect, in some embodiments, when the maximum number of downlink PTRS ports is configured as N and N is equal to 2, when the number of TCI states is equal to 2 and the number of CDM groups corresponding to the DMRS ports is equal to 2, the number of downlink PTRS ports is 2; or, when the number of TCI states is equal to 1 and / or the number of CDM groups corresponding to the DMRS ports is equal to 1, the number of downlink PTRS ports is 1.

[0034] In combination with some embodiments of the first aspect, in some embodiments, when the number of downlink PTRS ports is 2, the two downlink PTRS ports are respectively associated with the lowest index DMRS port in the two DMRS port groups indicating the TCI state.

[0035] In combination with some embodiments of the first aspect, in some embodiments, the number of downlink PTRS ports is 1, corresponding to a first time-frequency domain density configuration; the number of downlink PTRS ports is N, corresponding to a second time-frequency domain density configuration.

[0036] In combination with some embodiments of the first aspect, in some embodiments, the second time-frequency domain density configuration includes: time domain density and frequency domain density; the value of the time domain density is one of the following: 6, 4, 2; the value of the frequency domain density is one of the following: 1, 2.

[0037] In combination with some embodiments of the first aspect, in some embodiments, the second time-frequency domain density configuration includes at least one of the following: the modulation and coding scheme (MCS) of the downlink PTRS scheduling is greater than or equal to the first MCS threshold and less than the second MCS threshold, and the time domain density value is 6; the MCS of the downlink PTRS scheduling is greater than or equal to the second MCS threshold and less than the third MCS threshold, and the time domain density value is 4; the MCS of the downlink PTRS scheduling is greater than or equal to the third MCS threshold and less than the fourth MCS threshold, and the time domain density value is 2.

[0038] In combination with some embodiments of the first aspect, in some embodiments, the second time-frequency domain density configuration includes at least one of the following: the bandwidth of the downlink PTRS scheduling is greater than or equal to the first bandwidth threshold and less than the second bandwidth threshold, and the value of the frequency domain density is 1; the bandwidth of the downlink PTRS scheduling is greater than or equal to the second bandwidth threshold and less than the third bandwidth threshold, and the value of the frequency domain density is 2.

[0039] In a second aspect, the present disclosure implements a communication method, which is executed by a terminal, and the method includes: receiving configuration information, where the configuration information is used to indicate the number of downlink PTRS ports; determining the time-frequency domain density configuration of the downlink PTRS based on the number of downlink PTRS ports; wherein the downlink PTRS is used to estimate and compensate for the PN generated by the local oscillator used by at least one RF chain.

[0040] In combination with some embodiments of the second aspect, in some embodiments, the configuration information includes at least one of the following: the maximum number of downlink PTRS ports; the number of TCI states; the number of code CDM groups corresponding to the DMRS ports.

[0041] In combination with some embodiments of the second aspect, in some embodiments, receiving configuration information includes at least one of the following: receiving downlink PTRS configuration information, the downlink PTRS configuration information includes the maximum number of downlink PTRS ports and / or the number of CDM groups corresponding to the DMRS ports; receiving DCI, the DCI includes the number of TCI states.

[0042] In combination with some embodiments of the second aspect, in some embodiments, the number of downlink PTRS ports is 1 or N, where N is an integer greater than or equal to 2.

[0043] In combination with some embodiments of the second aspect, in some embodiments, when the maximum number of downlink PTRS ports is configured to be 1, the number of downlink PTRS ports is configured to be 1.

[0044] In combination with some embodiments of the second aspect, in some embodiments, when the maximum number of downlink PTRS ports is configured as N and N is equal to 2, when the number of TCI states is equal to 2 and the number of CDM groups corresponding to the DMRS ports is equal to 2, the number of downlink PTRS ports is 2; or, when the number of TCI states is equal to 1 and / or the number of CDM groups corresponding to the DMRS ports is equal to 1, the number of downlink PTRS ports is 1.

[0045] In combination with some embodiments of the second aspect, in some embodiments, when the number of downlink PTRS ports is 2, the two downlink PTRS ports are respectively associated with the lowest index DMRS port in the two DMRS port groups indicating the TCI state.

[0046] In combination with some embodiments of the second aspect, in some embodiments, the time-frequency domain density configuration of the downlink PTRS is determined based on the number of downlink PTRS ports, including: when the number of downlink PTRS ports is 1, determining the time-frequency domain density configuration as the first time-frequency domain density configuration; or, when the number of downlink PTRS ports is N, determining the time-frequency domain density configuration as the second time-frequency domain density configuration.

[0047] In the disclosed embodiment, under different local oscillator architectures, due to the different effects of PN on the transmitted signal, the time-frequency domain density configuration range of the downlink PTRS required by the terminal for PN estimation and compensation is different. Under the centralized local oscillator architecture, since CPE on all subcarriers occupies the majority of the phase noise, PN elimination (also known as estimation and compensation) requires a smaller frequency domain density of PTRS and a larger time domain density. Under the distributed local oscillator architecture, since the phase deflections caused by the new interference items on different subcarriers are different, it is not possible to eliminate only CPE, so PN elimination requires a larger frequency domain density of PTRS, while the time domain density can be reduced due to the shortening of the symbol length. By configuring different time-frequency domain density configurations for different local oscillator architectures, the terminal can be more accurate when performing PN estimation and compensation, further improving system performance.

[0048] In combination with some embodiments of the second aspect, in some embodiments, the second time-frequency domain density configuration includes: time domain density and frequency domain density; the value of the time domain density is one of the following: 6, 4, 2; the value of the frequency domain density is one of the following: 1, 2.

[0049] In combination with some embodiments of the second aspect, in some embodiments, the second time-frequency domain density configuration includes at least one of the following: the MCS of the downlink PTRS scheduling is greater than or equal to the first MCS threshold and less than the second MCS threshold, and the time domain density value is 6; the MCS of the downlink PTRS scheduling is greater than or equal to the second MCS threshold and less than the third MCS threshold, and the time domain density value is 4; the MCS of the downlink PTRS scheduling is greater than or equal to the third MCS threshold and less than the fourth MCS threshold, and the time domain density value is 2.

[0050] In combination with some embodiments of the second aspect, in some embodiments, the second time-frequency domain density configuration includes at least one of the following: the bandwidth of the downlink PTRS scheduling is greater than or equal to the first bandwidth threshold and less than the second bandwidth threshold, and the value of the frequency domain density is 1; the bandwidth of the downlink PTRS scheduling is greater than or equal to the second bandwidth threshold and less than the third bandwidth threshold, and the value of the frequency domain density is 2.

[0051] In a third aspect, the present disclosure provides a communication device that can be applied to a network device. The communication device includes: a sending module configured to send configuration information, the configuration information is used to indicate the number of downlink PTRS ports, and the downlink PTRS is used to estimate and compensate for the PN generated by the local oscillator used by at least one RF chain.

[0052] In combination with some embodiments of the third aspect, in some embodiments, the configuration information includes at least one of the following: the maximum number of downlink PTRS ports; the number of TCI states; the number of CDM groups corresponding to the DMRS ports.

[0053] In combination with some embodiments of the third aspect, in some embodiments, the sending module is configured to perform at least one of the following: sending downlink PTRS configuration information, the downlink PTRS configuration information includes the maximum number of downlink PTRS ports and / or the number of CDM groups corresponding to the DMRS ports; sending DCI, DCI is used to indicate the number of TCI states.

[0054] In combination with some embodiments of the third aspect, in some embodiments, the number of downlink PTRS ports is 1 or N, where N is an integer greater than or equal to 2.

[0055] In combination with some embodiments of the third aspect, in some embodiments, when the maximum number of downlink PTRS ports is configured to be 1, the number of downlink PTRS ports is 1.

[0056] In combination with some embodiments of the third aspect, in some embodiments, when the maximum number of downlink PTRS ports is configured as N and N is equal to 2, when the number of TCI states is equal to 2 and the number of CDM groups corresponding to the DMRS ports is equal to 2, the number of downlink PTRS ports is 2; or, when the number of TCI states is equal to 1 and / or the number of CDM groups corresponding to the DMRS ports is equal to 1, the number of downlink PTRS ports is 1.

[0057] In combination with some embodiments of the third aspect, in some embodiments, when the number of downlink PTRS ports is 2, the two downlink PTRS ports are respectively associated with the lowest index DMRS port in the two DMRS port groups indicating the TCI state.

[0058] In combination with some embodiments of the third aspect, in some embodiments, the number of downlink PTRS ports is 1 corresponding to the first time-frequency domain density configuration; or, the number of downlink PTRS ports is N corresponding to the second time-frequency domain density configuration.

[0059] In combination with some embodiments of the third aspect, in some embodiments, the second time-frequency domain density configuration includes: time domain density and frequency domain density; the value of the time domain density is one of the following: 6, 4, 2; the value of the frequency domain density is one of the following: 1, 2.

[0060] In combination with some embodiments of the third aspect, in some embodiments, the second time-frequency domain density configuration includes at least one of the following: the MCS of the downlink PTRS scheduling is greater than or equal to the first MCS threshold and less than the second MCS threshold, and the time domain density value is 6; the MCS of the downlink PTRS scheduling is greater than or equal to the second MCS threshold and less than the third MCS threshold, and the time domain density value is 4; the MCS of the downlink PTRS scheduling is greater than or equal to the third MCS threshold and less than the fourth MCS threshold, and the time domain density value is 2.

[0061] In combination with some embodiments of the third aspect, in some embodiments, the second time-frequency domain density configuration includes at least one of the following: the bandwidth of the downlink PTRS scheduling is greater than or equal to the first bandwidth threshold and less than the second bandwidth threshold, and the value of the frequency domain density is 1; the bandwidth of the downlink PTRS scheduling is greater than or equal to the second bandwidth threshold and less than the third bandwidth threshold, and the value of the frequency domain density is 2.

[0062] In a fourth aspect, the present disclosure provides a communication device that can be used in a terminal. The communication device includes: a receiving module configured to receive configuration information indicating the number of downlink PTRS ports; a processing module configured to determine a time-frequency density configuration of the downlink PTRS based on the number of downlink PTRS ports; wherein the downlink PTRS is used to estimate and compensate for a PN generated by a local oscillator used by at least one radio frequency chain.

[0063] In combination with some embodiments of the fourth aspect, in some embodiments, the configuration information includes at least one of the following: the maximum number of downlink PTRS ports; the number of TCI states; the number of code CDM groups corresponding to the DMRS ports.

[0064] In combination with some embodiments of the fourth aspect, in some embodiments, the receiving module is configured to perform at least one of the following: receiving downlink PTRS configuration information, the downlink PTRS configuration information including the maximum number of downlink PTRS ports and / or the number of CDM groups corresponding to the DMRS ports; receiving DCI, the DCI including the number of TCI states.

[0065] In combination with some embodiments of the fourth aspect, in some embodiments, the number of downlink PTRS ports is 1 or N, where N is an integer greater than or equal to 2.

[0066] In combination with some embodiments of the fourth aspect, in some embodiments, when the maximum number of downlink PTRS ports is configured to be 1, the number of downlink PTRS ports is configured to be 1.

[0067] In combination with some embodiments of the fourth aspect, in some embodiments, when the maximum number of downlink PTRS ports is configured as N and N is equal to 2, when the number of TCI states is equal to 2 and the number of CDM groups corresponding to the DMRS ports is equal to 2, the number of downlink PTRS ports is 2; or, when the number of TCI states is equal to 1 and / or the number of CDM groups corresponding to the DMRS ports is equal to 1, the number of downlink PTRS ports is 1.

[0068] In combination with some embodiments of the fourth aspect, in some embodiments, when the number of downlink PTRS ports is 2, the two downlink PTRS ports are respectively associated with the lowest index DMRS port in the two DMRS port groups indicating the TCI state.

[0069] In combination with some embodiments of the fourth aspect, in some embodiments, the processing module is configured to, when the number of downlink PTRS ports is 1, determine the time-frequency domain density configuration as the first time-frequency domain density configuration; or, when the number of downlink PTRS ports is N, determine the time-frequency domain density configuration as the second time-frequency domain density configuration.

[0070] In combination with some embodiments of the fourth aspect, in some embodiments, the second time-frequency domain density configuration includes: time domain density and frequency domain density; the value of the time domain density is one of the following: 6, 4, 2; the value of the frequency domain density is one of the following: 1, 2.

[0071] In combination with some embodiments of the fourth aspect, in some embodiments, the second time-frequency domain density configuration includes at least one of the following: the MCS of the downlink PTRS scheduling is greater than or equal to the first MCS threshold and less than the second MCS threshold, and the time domain density value is 6; the MCS of the downlink PTRS scheduling is greater than or equal to the second MCS threshold and less than the third MCS threshold, and the time domain density value is 4; the MCS of the downlink PTRS scheduling is greater than or equal to the third MCS threshold and less than the fourth MCS threshold, and the time domain density value is 2.

[0072] In combination with some embodiments of the fourth aspect, in some embodiments, the second time-frequency domain density configuration includes at least one of the following: the bandwidth of the downlink PTRS scheduling is greater than or equal to the first bandwidth threshold and less than the second bandwidth threshold, and the value of the frequency domain density is 1; the bandwidth of the downlink PTRS scheduling is greater than or equal to the second bandwidth threshold and less than the third bandwidth threshold, and the value of the frequency domain density is 2.

[0073] In a fifth aspect, embodiments of the present disclosure provide a communications device, such as a terminal or network device. The communications device includes: at least one processor; and a memory coupled to the at least one processor, the memory storing executable instructions that, when executed by the at least one processor, cause the communications device to perform any of the methods described in the first aspect, the second aspect, and their embodiments.

[0074] In a sixth aspect, an embodiment of the present disclosure provides a storage medium having stored therein instructions that, when executed in a communication device, cause the communication device to execute the method as described in any one of the first aspect, the second aspect, and the embodiments thereof.

[0075] In a seventh aspect, a computer program or computer program product is provided. The computer program or computer program product includes code. When the instructions are executed by a processor, the method according to any one of the first aspect, the second aspect, and the embodiments thereof is performed.

[0076] It is understandable that the above-mentioned communication devices, communication equipment, storage media, computer programs, and computer program products are all used to execute the methods provided by the embodiments of the present disclosure. Therefore, the beneficial effects that can be achieved can refer to the beneficial effects of the corresponding methods and will not be repeated here.

[0077] The present disclosure provides a communication method and apparatus, a communication device, and a storage medium. In some embodiments, the terms "communication method" and "PTRS configuration method," "PTRS time-frequency resource density determination method," and "information processing method" are interchangeable, and the terms "communication device" and "PTRS configuration device" and "information processing device" are interchangeable.

[0078] The embodiments of the present disclosure are not exhaustive and are merely illustrative of some embodiments, and are not intended to be a specific limitation on the scope of protection of the present disclosure. In the absence of contradiction, each step in a certain embodiment can be implemented as an independent embodiment, and the steps can be arbitrarily combined. For example, a solution after removing some steps in a certain embodiment can also be implemented as an independent embodiment, and the order of the steps in a certain embodiment can be arbitrarily exchanged. In addition, the optional implementation methods in a certain embodiment can be arbitrarily combined; in addition, the embodiments can be arbitrarily combined. For example, some or all steps of different embodiments can be arbitrarily combined, and a certain embodiment can be arbitrarily combined with the optional implementation methods of other embodiments.

[0079] In each embodiment of the present disclosure, unless otherwise specified or provided for by logic, the terms and / or descriptions between the embodiments are consistent and can be referenced by each other. The technical features in different embodiments can be combined to form a new embodiment based on their inherent logical relationships.

[0080] The terms used in the embodiments of the present disclosure are only for the purpose of describing specific embodiments and are not intended to limit the present disclosure.

[0081] In the embodiments of the present disclosure, unless otherwise specified, elements expressed in the singular, such as "a", "an", "the", "above", "said", "the", "the", etc., may mean "one and only one", or "one or more", "at least one", etc. For example, when using articles such as "a", "an", "the" in English in translation, the noun following the article may be understood as a singular expression or a plural expression.

[0082] In the embodiments of the present disclosure, “plurality” refers to two or more.

[0083] In some embodiments, the terms "at least one", "one or more", etc. can be used interchangeably.

[0084] In some embodiments, descriptions such as "at least one of A and B," "A and / or B," "in one case A, in another case B," or "in one case A, in another case B" may include the following technical solutions depending on the situation: in some embodiments, A (A is executed independently of B); in some embodiments, B (B is executed independently of A); in some embodiments, execution is selected from A and B (A and B are selectively executed); and in some embodiments, A and B (both A and B are executed). The same applies when there are more branches such as A, B, and C.

[0085] In some embodiments, "A or B" and other descriptions may include the following technical solutions depending on the situation: in some embodiments, A (A is executed independently of B); in some embodiments, B (B is executed independently of A); in some embodiments, execution is selected from A and B (A and B are selectively executed). The above is also applicable when there are more branches such as A, B, C, etc.

[0086] The prefixes such as "first" and "second" in the embodiments of the present disclosure are only used to distinguish different description objects and do not constitute any restriction on the position, order, priority, quantity or content of the description objects. For the statement of the description object, please refer to the description in the context of the claims or embodiments, and no unnecessary restriction should be constituted due to the use of prefixes. For example, if the description object is a "field", the ordinal number before the "field" in the "first field" and the "second field" does not limit the position or order between the "fields". "First" and "second" do not limit whether the "fields" they modify are in the same message, nor do they limit the order of the "first field" and the "second field". For another example, if the description object is a "level", the ordinal number before the "level" in the "first level" and the "second level" does not limit the priority between the "levels". For another example, the number of description objects is not limited by the ordinal number and can be one or more. Taking "first device" as an example, the number of "devices" can be one or more. In addition, the objects modified by different prefixes can be the same or different. For example, if the description object is "device", then the "first device" and the "second device" can be the same device or different devices, and their types can be the same or different; for another example, if the description object is "information", then the "first information" and the "second information" can be the same information or different information, and their contents can be the same or different.

[0087] In some embodiments, “including A,” “comprising A,” “used to indicate A,” and “carrying A” can be interpreted as directly carrying A or indirectly indicating A.

[0088] In some embodiments, terms such as "...", "determine...", "in the case of...", "at the time of...", "when...", "if...", "if...", etc. can be used interchangeably.

[0089] In some embodiments, terms such as "greater than", "greater than or equal to", "not less than", "more than", "more than or equal to", "not less than", "higher than", "higher than or equal to", "not less than", and "above" can be replaced with each other, and terms such as "less than", "less than or equal to", "not greater than", "less than", "less than or equal to", "not more than", "lower than", "lower than or equal to", "not higher than", and "below" can be replaced with each other.

[0090] In some embodiments, devices, etc. can be interpreted as physical or virtual, and their names are not limited to the names recorded in the embodiments. Terms such as "device", "equipment", "device", "circuit", "network element", "node", "function", "unit", "section", "system", "network", "chip", "chip system", "entity", and "subject" can be used interchangeably.

[0091] In some embodiments, "network" can be interpreted as devices included in the network (for example, access network equipment, core network equipment, data network equipment, etc.).

[0092] In some embodiments, the terms "access network device (AN device)", "radio access network device (RAN device)", "base station (BS)", "radio base station" "fixed station", "node", "access point", "transmission point (TP)", "reception point (RP)", "transmission / reception point (TRP)", "panel", "antenna panel", "antenna array", "cell", "macro cell", "small cell", "femto cell", "pico cell", "sector", "cell group", "serving cell", "carrier", "component carrier", "bandwidth part (BWP)" and the like may be used interchangeably.

[0093] In some embodiments, the terms "terminal", "terminal device", "user equipment (UE)", "user terminal", "mobile station (MS)", "mobile terminal (MT)", subscriber station, mobile unit, subscriber unit, wireless unit, remote unit, mobile device, wireless device, wireless communication device, remote device, mobile subscriber station, access terminal, mobile terminal, wireless terminal, remote terminal, handset, user agent, mobile client, client, etc. can be used interchangeably.

[0094] In some embodiments, the access network device, the core network device, or the network device can be replaced by a terminal. For example, the various embodiments of the present disclosure can also be applied to a structure in which the communication between the access network device, the core network device, or the network device and the terminal is replaced by communication between multiple terminals (for example, device-to-device (D2D), vehicle-to-everything (V2X), etc.). In this case, it is also possible to set the structure in which the terminal has all or part of the functions of the access network device. In addition, terms such as "uplink" and "downlink" can also be replaced by terms corresponding to communication between terminals (for example, "side"). For example, uplink channels, downlink channels, etc. can be replaced by side channels, and uplinks, downlinks, etc. can be replaced by side links.

[0095] In some embodiments, the terminal may be replaced by an access network device, a core network device, or a network device. In this case, the access network device, the core network device, or the network device may have a structure that has all or part of the functions of the terminal.

[0096] In some embodiments, the access network device may also be referred to as an access network function, an access network element, etc.

[0097] In some embodiments, core network devices may also be referred to as core network functions, core networks, core network elements, etc. Furthermore, in some embodiments, each network device in the core network may also be referred to as a network function, a network element, etc.

[0098] In some embodiments, obtaining data, information, etc. may comply with the laws and regulations of the country where the data is obtained.

[0099] In some embodiments, data, information, etc. may be obtained with the user's consent.

[0100] In addition, each element, each row, or each column in the table of the embodiment of the present disclosure can be implemented as an independent embodiment, and the combination of any elements, any rows, and any columns can also be implemented as an independent embodiment.

[0101] Figure 1 is a schematic diagram of an architecture of a communication system provided according to an embodiment of the present disclosure. As shown in Figure 1, the communication system 100 includes a terminal 101 and a network device 102. The network device 102 may be an access network device.

[0102] In some embodiments, the terminal 101 includes, for example, a mobile phone, a wearable device, an Internet of Things (IoT) device, a car with communication function, a smart car, a tablet computer (Pad), a computer with wireless transceiver function, a virtual reality (VR) terminal device, an augmented reality (AR) terminal device, a wireless terminal device in industrial control, a wireless terminal device in self-driving, a wireless terminal device in remote medical surgery, a wireless terminal device in a smart grid, a wireless terminal device in transportation safety, a wireless terminal device in a smart city, and at least one of a wireless terminal device in a smart home, but is not limited thereto.

[0103] In some embodiments, the access network device, for example, may be a node or device that accesses a terminal to a wireless network. The access network device may include an evolved NodeB (eNB), a next generation evolved NodeB (ng-eNB), a next generation NodeB (gNB), a node B (NB), a home node B (HNB), a home evolved nodeB (HeNB), a wireless backhaul device, a radio network controller (RNC), a base station controller (BSC), a base transceiver station (BTS), a base band unit (BBU), a mobile switching center, a base station in a 6G communication system, an open base station (Open RAN), a cloud base station (Cloud RAN), a satellite base station, a base station in other communication systems, and at least one of an access node in a Wi-Fi system, but is not limited thereto.

[0104] In some embodiments, the technical solution of the present disclosure can be applied to the Open RAN architecture. In this case, the interfaces within the network devices involved in the embodiments of the present disclosure can be transformed into internal interfaces of the Open RAN, and the processes and information interactions between these internal interfaces can be implemented through software or programs.

[0105] In some embodiments, the access network device can be composed of a centralized unit (CU) and a distributed unit (DU), where the CU can also be called a control unit. The CU-DU structure can be used to split the protocol layer of the network device, with the functions of some protocol layers centrally controlled by the CU, and the functions of the remaining part or all of the protocol layers distributed in the DU, which is centrally controlled by the CU, but is not limited to this.

[0106] It can be understood that the communication system described in the embodiment of the present disclosure is for the purpose of more clearly illustrating the technical solution of the embodiment of the present disclosure, and does not constitute a limitation on the technical solution provided by the embodiment of the present disclosure. Ordinary technicians in this field can know that with the evolution of the system architecture and the emergence of new business scenarios, the technical solution provided by the embodiment of the present disclosure is also applicable to similar technical problems.

[0107] The following embodiments of the present disclosure may be applied to the communication system 100 shown in Figure 1, or a portion thereof, but are not limited thereto. The entities shown in Figure 1 are illustrative only. The communication system may include all or part of the entities shown in Figure 1, or may include other entities outside of Figure 1. The number and form of the entities may be arbitrary. The connection relationship between the entities is illustrative only. The entities may be connected or disconnected, and the connection may be in any manner, including direct or indirect, wired or wireless.

[0108] The embodiments of the present disclosure can be applied to Long Term Evolution (LTE), LTE-Advanced (LTE-A), LTE-Beyond (LTE-B), SUPER 3G, IMT-Advanced, 4th generation mobile communication system (4G), 5th generation mobile communication system (5G), 5G New Radio (NR), Future Radio Access (FRA), New Radio (NR), New Radio Access (NX), Future Generation Radio Access (FX), Global System for Mobile Communications (GSM (registered trademark)), CDMA2000, Ultra Mobile Broadband (UMB), IEEE 802.11 (Wi-Fi (registered trademark)), IEEE 802.16 (WiMAX (registered trademark)), IEEE 802.20, Ultra-WideBand (UWB), Bluetooth (registered trademark), Public Land Mobile Network (PLMN) networks, Device-to-Device (D2D) systems, Machine-to-Machine (M2M) systems, Internet of Things (IoT) systems, Vehicle-to-Everything (V2X), systems utilizing other communication methods, and next-generation systems based on and extending these methods. Furthermore, multiple systems may be combined (for example, a combination of LTE or LTE-A with 5G).

[0109] The millimeter wave band offers enormous bandwidth, high transmission rates, and short wavelengths, facilitating the integration of antenna components. These advantages have made millimeter wave wireless communication technology highly sought after. However, millimeter waves also have significant drawbacks, such as being easily obstructed by obstacles and being highly sensitive to PN.

[0110] In communication systems, network equipment typically uses a centralized local oscillator (LO) architecture, employing only a single local oscillator (LO) and a small number of antennas. All DMRS antenna ports are coherent, requiring only a single PTRS port. In this centralized LO architecture, PN affects OFDM signals in two ways: one is the common phase error (CPE), which causes all subcarrier signals to have the same phase shift; the other is the interference caused by the phase noise of adjacent subcarriers superimposed on the current subcarrier signal, known as inter-carrier interference (ICI).

[0111] However, with the advancement of wireless communication technology, the local oscillator (LO) architecture in communication systems has evolved, with the introduction of distributed LO architectures. For example, massive multiple-input, multiple-output (MIMO) OFDM systems typically employ a distributed LO architecture. In a distributed LO architecture, each RF chain is connected to a dedicated LO, resulting in the transmitted signals from different RF chains experiencing independent PN. Consequently, PN affects the OFDM signal in three ways: first, all subcarriers experience the same phase rotation, known as CPE; second, the signal from the adjacent m-th subcarrier, affected by phase noise, is added to the current k-th subcarrier, known as ICI; and third, the current k-th subcarrier experiences a phase shift related to subcarrier index k, resulting in different phase shifts for different subcarriers, a new interference term. Therefore, the PN cancellation algorithm for high-frequency millimeter-wave OFDM systems using a distributed LO architecture cannot simply consider CPE cancellation, as in traditional centralized LO architectures. The PTRS should not be too sparsely spaced in the frequency domain. In addition, millimeter waves will use larger subcarrier spacing, the time domain symbols will be greatly shortened, PN may no longer change symbol by symbol in the time domain, and the arrangement of PTRS in the time domain may no longer be too dense.

[0112] This shows that the PTRS density requirements in the frequency and time domains differ for centralized and distributed LO architectures. Therefore, how terminals estimate and compensate for PN for different LO architectures is an urgent issue to be addressed.

[0113] Before further describing the embodiments of the present disclosure in detail, the nouns and terms involved in the embodiments of the present disclosure are explained. The nouns and terms involved in the embodiments of the present disclosure are subject to the following interpretations.

[0114] 1. Phase Noise (PN)

[0115] PN is the phase error between the local oscillator (LO) and the actual carrier signal. This means the phase of the sine wave generated by the LO varies randomly over time, causing the power spectral density of the generated carrier to spread. PN is typically characterized in the frequency domain. At a fixed frequency offset from the carrier frequency, PN is expressed as the ratio of the noise power within a 1Hz bandwidth at that frequency to the carrier signal power, expressed in dBc / Hz.

[0116] In wireless communication systems, PN is introduced at the upconversion and downconversion locations due to imperfect oscillators. In the discrete time domain, the effects of PN are observed as multiplicative noise on OFDM signals. PN is introduced when the baseband signal is multiplied by the high-frequency carrier generated by the oscillator for frequency upconversion. PN is also introduced at the receiver during the downconversion of the passband signal to baseband.

[0117] 2. Centralized Local Oscillator Architecture

[0118] The central local oscillator architecture means that multiple RF chains (also called RF links) share the local oscillator, and the phase noise multiplied by the signals on all transmitting antennas is the same, and the phase noise multiplied by the signals on all receiving antennas is the same.

[0119] FIG2 is a schematic diagram of an OFDM system affected by PN under a centralized local oscillator architecture provided according to an embodiment of the present disclosure. As shown in FIG2 , assuming that each antenna represents a baseband port, the OFDM system uses multiple antennas to achieve multiplexing gain. The baseband processing unit 211 at the transmitting end is connected to multiple transmitting antennas 212, and the baseband processing unit 221 at the receiving end is connected to multiple receiving antennas 222. During the up-conversion process of the baseband signal, PN is introduced due to the non-ideal characteristics of the oscillator, and reaches the receiving end after passing through the multipath channel and being affected by additive white Gaussian noise. PN is also introduced during the down-conversion process at the receiving end. Due to the use of a centralized local oscillator architecture, the PN multiplied by the signals on all transmitting antennas (or receiving antennas) is the same. Therefore, the impact of PN on the transmitted signal includes CPE and ICI.

[0120] 3. Distributed Local Oscillator Architecture

[0121] The distributed local oscillator architecture means that multiple radio frequency links have dedicated local oscillators, and different local oscillators generate different PNs.

[0122] FIG3 is a schematic diagram of an OFDM system affected by PN under a distributed local oscillator architecture according to an embodiment of the present disclosure. As shown in FIG3 , the PN multiplied by the signal on each transmitting antenna 212 (or receiving antenna 222) is no longer the same. For example, the PN corresponding to the transmitting antenna 212 is 1i (i=1, ..., m, ..., n, n is the number of transmitting antennas 212, m<n), the receiving antenna 222 corresponds to PN 2j (j=1, ..., m, ..., n, n is the number of receiving antennas 222, m<n), PN 1i or PN 2j The two factors (CPE and ICI) that affect PN on transmitted signals have increased from three (CPE, ICI, and new interference) to three (CPE, ICI, and new interference). The emergence of new interference also makes PN in the distributed local oscillator architecture more difficult to track and compensate.

[0123] Figure 4 is an exemplary interaction diagram of a communication method according to an embodiment of the present disclosure. This embodiment of the present disclosure relates to a communication method, which is applied to a communication system 100, including an access network device and a terminal. As shown in Figure 4, the method includes steps S410 to S420.

[0124] In step S410 , the network device sends configuration information.

[0125] In some embodiments, the network device may employ a centralized local oscillator architecture, in which N radio frequency chains share a single local oscillator, where N is an integer greater than or equal to 2. For example, FIG5A is a schematic diagram of a structure of a network device according to an embodiment of the present disclosure. As shown in FIG5A , two radio frequency chains 51 of a network device (e.g., a base station) use a single local oscillator (PN). In this case, the network device requires a downlink PTRS port to estimate and compensate for the PN generated by the local oscillator.

[0126] In some embodiments, the network device may adopt a distributed local oscillator architecture, in which case the N RF chains correspond one to one with the N local oscillators. For example, FIG5B is another structural diagram of a network device provided according to an embodiment of the present disclosure. As shown in FIG5B , taking N=2 as an example, the two RF chains 51 of the network device (such as a base station) use their own local oscillators PN1 and PN2, and PN1 and PN2 are independent of each other. At this time, the network device requires two downlink PTRS ports to respectively estimate and compensate for the PN generated by their respective local oscillators. For example, N>2, the N RF chains of the network device (such as a base station) use their own local oscillators PN1, PN2, ...PN N , PN1, PN2, ...PN N In this case, the network device requires N downlink PTRS ports to estimate and compensate for the PN generated by their respective local oscillators. In some embodiments, the value of N can be 2, 4, 8, 16, etc.

[0127] In some embodiments, the terminal receives configuration information.

[0128] In some embodiments, the configuration information is used to indicate the number of downlink PTRS ports.

[0129] In some embodiments, the downlink PTRS is used to track and compensate for the PN generated by one or N local oscillators in the network device.

[0130] In some embodiments, the configuration information includes at least one of the following: a maximum number of downlink PTRS ports, a number of TCI states, and a number of CDM groups corresponding to DMRS ports. For example, the maximum number of downlink PTRS port groups may be a higher-level parameter maxNrofPorts.

[0131] It should be noted that the CDM group corresponding to the DMRS port may also be called a DMRS port group.

[0132] In some embodiments, the number of downlink PTRS ports may be indicated by radio resource control (RRC) configuration information, or may be indicated by both RRC configuration information and DCI.

[0133] In some embodiments, the network device sends downlink PTRS configuration information (ie, RRC configuration information).

[0134] In one embodiment, the downlink PTRS configuration information includes the maximum number of downlink PTRS ports.

[0135] In one embodiment, the downlink PTRS configuration information includes the maximum number of downlink PTRS ports and the number of CDM groups corresponding to the DMRS ports.

[0136] In some embodiments, the network device sends DCI. In one embodiment, the DCI includes the number of TCI states.

[0137] In some embodiments, under the centralized local oscillator architecture, the network device may have one downlink PTRS port. Therefore, the network device may use one downlink PTRS port to send downlink PTRS. In this case, the number of downlink PTRS ports indicated by the configuration information is one.

[0138] In some embodiments, under the above-described distributed local oscillator architecture, the network device may have N downlink PTRS ports. Therefore, the network device may use the N downlink PTRS ports to send downlink PTRS. In this case, the number of downlink PTRS ports indicated by the configuration information is N.

[0139] In some embodiments, the number of PTRS ports is related to the number of PN sources. In the case of a distributed local oscillator architecture, the number of PN sources can be N, such as 2, 4, 8, 16, etc. In this case, the number of downlink PTRS ports can be N, such as 2, 4, 8, 16, etc. Therefore, when sending downlink PTRS, the network device can use 2 downlink PTRS ports, or 4 downlink PTRS ports, 8 downlink PTRS ports, 16 downlink PTRS ports, etc. Of course, as communication systems evolve, the number of antennas in communication devices can be further increased, and larger-scale antenna arrays can be used. In this case, the number N of downlink PTRS ports can also be increased accordingly. Therefore, the embodiment of the present disclosure does not specifically limit the number of downlink PTRS ports.

[0140] In step S420, the terminal determines the time-frequency domain density configuration of the downlink PTRS based on the number of downlink PTRS ports.

[0141] In some embodiments, the terminal receives configuration information and determines the number of downlink PTRS ports based on the configuration information. In one embodiment, the terminal determines the number of downlink PTRS ports based on the maximum number of downlink PTRS ports, the number of TCI states, and the number of CDM groups corresponding to the DMRS ports.

[0142] In some embodiments, when the maximum number of downlink PTRS ports is configured as 1, the terminal determines that the number of downlink PTRS ports is 1.

[0143] In some embodiments, when the maximum number of downlink PTRS ports is configured as 2 and at least one of the number of TCI states and the number of CDM groups corresponding to the DMRS ports is equal to 1, the terminal determines that the number of downlink PTRS ports is 1.

[0144] In some embodiments, when the terminal determines that the number of downlink PTRS ports is 1, it considers that the network device adopts a centralized local oscillator architecture.

[0145] In some embodiments, when the terminal determines that the number of downlink PTRS ports is 1, the downlink PTRS port is associated with the DMRS port with the lowest index among the DMRS ports allocated for the physical downlink share channel (PDSCH). In some embodiments, when the maximum number of downlink PTRS ports is configured as 2, the number of TCI states is equal to 2, and the number of CDM groups corresponding to the DMRS ports is equal to 2, the terminal determines that the number of downlink PTRS ports is 2.

[0146] In some embodiments, when the terminal determines that the number of downlink PTRS ports is 2, it considers that the network device adopts a distributed local oscillator architecture.

[0147] In some embodiments, when the terminal determines that the number of downlink PTRS ports is 2, the two downlink PTRS ports are respectively associated with the lowest-indexed DMRS ports in the CDM groups corresponding to the DMRS ports of the two indicated TCI states (e.g., the first TCI state and the second TCI state). Exemplarily, in one case, the higher-layer parameter maxNrofPorts is set to 1. In this case, the terminal determines that the number of downlink PTRS ports is 1. In another case, the higher-layer parameter maxNrofPorts is set to 2, and the number of TCI states indicated by the DCI and the number of CDM groups corresponding to the DMRS ports are both 2. In this case, the terminal determines that the number of downlink PTRS ports is 2. Then, the terminal will receive downlink PTRSs sent by the two downlink PTRS ports. These two downlink PTRS ports are respectively associated with the lowest-indexed DMRS ports in the CDM groups corresponding to the DMRS ports corresponding to the two TCI states.

[0148] It should be noted that the above-mentioned "the lowest index DMRS port in the CDM group corresponding to the DMRS ports of the two indicated TCI states" can also be described as: "the lowest index DMRS port among the DMRS ports of the two indicated TCI states", "the lowest index DMRS port among the DMRS ports corresponding to the indicated first TCI state and the second TCI state", etc., and the embodiments of the present disclosure do not make specific limitations.

[0149] For example, in one case, the higher-layer parameter maxNrofPorts is configured to 2, the number of TCI states indicated by the DCI is 1, and the number of CDM groups corresponding to the DMRS port is 2. In this case, the terminal determines that the number of downlink PTRS ports is 1. In another case, the higher-layer parameter maxNrofPorts is set to 2, the number of TCI states indicated by the DCI is 2, and the number of CDM groups corresponding to the DMRS port is 1. In this case, the terminal determines that the number of downlink PTRS ports is 1.

[0150] In some embodiments, when the maximum number of downlink PTRS ports is configured as 4, and at least one of the number of TCI states and the number of CDM groups corresponding to the DMRS ports is equal to 1 or 2, the terminal determines that the number of downlink PTRS ports is 1 or 2.

[0151] In some embodiments, when the maximum number of downlink PTRS ports is configured as 4, the number of TCI states is equal to 4, and the number of CDM groups corresponding to the DMRS ports is equal to 4, the terminal determines that the number of downlink PTRS ports is 4.

[0152] In some embodiments, when the terminal determines that the number of downlink PTRS ports is 4, the 4 downlink PTRS ports are respectively associated with the lowest index DMRS port in the CDM group corresponding to the 4 DMRS ports indicating the TCI state.

[0153] Exemplarily, in one case, the high-level parameter maxNrofPorts is set to 4, and the number of TCI states indicated by the DCI and the number of CDM groups corresponding to the DMRS port are both 4. In this case, the terminal determines that the downlink PTRS port is 4. Then. The terminal will receive the downlink PTRS sent by 4 downlink PTRS ports. These 4 downlink PTRS ports are respectively associated with the lowest-indexed DMRS port in the CDM group corresponding to the DMRS port corresponding to the 4 TCI states. In another case, the high-level parameter maxNrofPorts is set to 4, the number of TCI states indicated by the DCI is 1 or 2, and the number of CDM groups corresponding to the DMRS port is 4. In this case, the terminal determines that the number of downlink PTRS ports is 1 or 2. In yet another case, the high-level parameter maxNrofPorts is set to 4, the number of TCI states indicated by the DCI is 4, and the number of CDM groups corresponding to the DMRS port is 1 or 2. In this case, the terminal determines that the number of downlink PTRS ports is 1 or 2.

[0154] In some embodiments, when the maximum number of downlink PTRS ports is configured to be 8, and at least one of the number of TCI states and the number of CDM groups corresponding to the DMRS ports is equal to 1, 2 or 4, the terminal determines that the number of downlink PTRS ports is 1, 2 or 4.

[0155] In some embodiments, when the maximum number of downlink PTRS ports is configured as 8, the number of TCI states is equal to 8, and the number of CDM groups corresponding to the DMRS ports is equal to 8, the terminal determines that the number of downlink PTRS ports is 8.

[0156] In some embodiments, when the terminal determines that the number of downlink PTRS ports is 8, the 8 downlink PTRS ports are respectively associated with the lowest-indexed DMRS port in the CDM group corresponding to the 8 DMRS ports indicating the TCI state.

[0157] Exemplarily, in one case, the high-level parameter maxNrofPorts is set to 8, and the number of TCI states indicated by the DCI and the number of CDM groups corresponding to the DMRS ports are both 8. In this case, the terminal determines that the downlink PTRS ports are 8. Then. The terminal will receive the downlink PTRS sent by 8 downlink PTRS ports. These 8 downlink PTRS ports are respectively associated with the lowest-indexed DMRS ports in the CDM groups corresponding to the DMRS ports corresponding to the 8 TCI states. In another case, the high-level parameter maxNrofPorts is set to 8, the number of TCI states indicated by the DCI is 1, 2 or 4, and the number of CDM groups corresponding to the DMRS ports is 8. In this case, the terminal determines that the number of downlink PTRS ports is 1, 2 or 4. In yet another case, the high-level parameter maxNrofPorts is set to 8, the number of TCI states indicated by the DCI is 8, and the number of CDM groups corresponding to the DMRS ports is 1, 2 or 4. In this case, the terminal determines that the number of downlink PTRS ports is 1, 2 or 4.

[0158] In some embodiments, the time-frequency domain density configuration of the downlink PTRS is different for different numbers of PTRS ports. The terminal can determine the corresponding time-frequency domain density configuration of the downlink PTRS according to the number of downlink PTRS ports.

[0159] In some embodiments, when the number of downlink PTRS ports is 1, the time-frequency domain density configuration of the downlink PTRS may be a first time-frequency domain density configuration. Since the network device adopts a centralized local oscillator architecture when the number of downlink PTRS ports is 1, the downlink PTRS with the first time-frequency domain density configuration has a lower frequency domain density and a higher time domain density.

[0160] In some embodiments, when the number of downlink PTRS ports is N, the time-frequency domain density configuration of the downlink PTRS may be a second time-frequency domain density configuration. Since the network device adopts a distributed local oscillator architecture when the number of downlink PTRS ports is N, the downlink PTRS with the second time-frequency domain density configuration has a higher frequency domain density and a lower time domain density.

[0161] In some embodiments, the time-frequency domain density configuration of the downlink PTRS includes time-domain density and frequency-domain density. The first time-frequency domain density configuration includes a first time-domain density and a first frequency-domain density. The second time-frequency domain density configuration includes a second time-domain density and a second frequency-domain density.

[0162] In some embodiments, the first time-frequency domain density configuration includes a first time-domain density and a first frequency-domain density, wherein the first time-domain density has a value of one of the following: 4, 2, or 1; and the first frequency-domain density has a value of one of the following: 2 or 4.

[0163] In some embodiments, the terminal may determine the first time domain density according to the MSC scheduled by the downlink PTRS. Exemplarily, the mapping relationship between the MSC scheduled by the downlink PTRS and the first time domain density may be as shown in Table 1 below. MSC The value of the MSC for downlink PTRS scheduling, ptrs-MCS i (i=1, 2, 3, 4) are the first MSC threshold, the second MCS threshold, the third MCS threshold and the fourth MCS threshold respectively.

[0164] In some embodiments, the terminal may determine the first time domain density according to the bandwidth of the downlink PTRS scheduling. For example, the mapping relationship between the bandwidth of the downlink PTRS scheduling and the first frequency domain density may be as shown in Table 2 below. RB N is the bandwidth value of downlink PTRS scheduling, Rbi (i=0, 1) are the first bandwidth threshold and the second bandwidth threshold respectively.

[0165] Table 1

[0166] Table 2

[0167] In some embodiments, the second time-frequency domain density configuration includes a second time-domain density and a second frequency-domain density, wherein the second time-domain density is one of the following: 6, 4, or 2; and the second frequency-domain density is one of the following: 1 or 2.

[0168] In some embodiments, the terminal may determine the second time domain density according to the MSC scheduled by the downlink PTRS. For example, the mapping relationship between the MSC scheduled by the downlink PTRS and the second time domain density may be as shown in Table 3 below.

[0169] In some embodiments, the terminal may determine the second time domain density based on the bandwidth scheduled by the downlink PTRS. For example, the mapping relationship between the bandwidth scheduled by the downlink PTRS and the second frequency domain density may be as shown in Table 4 below.

[0170] Table 3

[0171] Table 4

[0172] In some embodiments, the aforementioned table may be an RRC table, that is, the time-frequency domain density of the downlink PTRS is configured to the terminal via RRC signaling. This eliminates the need to add additional fields to the DCI; instead, only two new RRC tables are needed to indicate the PTRS time-frequency domain density ranges corresponding to different numbers of PTRS ports under different local oscillator architectures, with minimal changes to the communication protocol. Furthermore, by adding new RRC tables, different PTRS time-frequency domain density configuration ranges can be defined for different scenarios, providing strong scalability.

[0173] The communication method involved in the embodiments of the present disclosure may include at least one of steps S410 to S420. For example, step S410 may be implemented as an independent embodiment. For example, step S420 may be implemented as an independent embodiment. It should be noted that the possible independent embodiments consisting of one or more steps from steps S410 to S420 are not limited to these.

[0174] In the disclosed embodiments, the network device indicates the number of downlink PTRS ports to the terminal, enabling the terminal to determine the corresponding downlink PTRS time-frequency density configuration based on the number of downlink PTRS ports. This time-frequency density configuration is more conducive to the terminal accurately estimating and compensating for PN, thereby improving overall system performance.

[0175] Furthermore, in the disclosed embodiments, under different local oscillator architectures, due to the different effects of PN on the transmitted signal, the time-frequency domain density configuration ranges of the downlink PTRS required for PN estimation and compensation by the terminal are different. Under the centralized local oscillator architecture, since CPE on all subcarriers occupies the majority of the phase noise, the frequency domain density of the PTRS required for PN elimination is relatively small, while the time domain density is relatively large. Under the distributed local oscillator architecture, since the phase deflections caused by the new interference terms on different subcarriers are different, it is not possible to eliminate only CPE. Therefore, the frequency domain density of the PTRS required for PN elimination is relatively large, while the time domain density can be reduced due to the shortening of the symbol length. By configuring different time-frequency domain density configurations for different local oscillator architectures, the terminal can estimate and compensate for PN more accurately, further improving system performance.

[0176] In some embodiments, the names of information, etc. are not limited to the names described in the embodiments, "information", "message", etc.

[0177] The terms "message", "signal", "signaling", "report", "configuration", "indication", "instruction", "command", "channel", "parameter", "domain", "field", "symbol", "symbol", "codebook", "codeword", "codepoint", "bit", "data", "program", and "chip" are used interchangeably.

[0178] In some embodiments, terms such as "moment", "time point", "time", and "time position" can be replaced with each other, and terms such as "duration", "period", "time window", "window", and "time" can be replaced with each other.

[0179] In some embodiments, "obtain", "get", "get", "receive", "transmit", "bidirectional transmission", "send and / or receive" can be interchangeable, and can be interpreted as receiving from other entities, obtaining from protocols, obtaining from higher layers, obtaining by self-processing, autonomous implementation, etc.

[0180] In some embodiments, terms such as "send", "transmit", "report", "download", "transmit", "bidirectional transmission", "send and / or receive" can be used interchangeably.

[0181] In some embodiments, terms such as "certain", "preset", "preset", "setting", "indicated", "some", "any", and "first" can be interchangeable. "Specific A", "preset A", "preset A", "setting A", "indicated A", "some A", "any A", and "first A" can be interpreted as A pre-specified in a protocol, etc., or as A obtained through setting, configuration, or indication, etc., or as specific A, some A, any A, or first A, etc., but not limited to this.

[0182] In some embodiments, the determination or judgment can be performed by a value represented by 1 bit (0 or 1), or by a true or false value (Boolean value) represented by true or false, or by comparison of numerical values ​​(for example, comparison with a predetermined value), but is not limited thereto.

[0183] Figure 6 is an exemplary flow chart of a communication method performed on a network device according to an embodiment of the present disclosure. This embodiment of the present disclosure relates to a communication method, which is applied to a network device. As shown in Figure 6, the method includes step S610.

[0184] In step S610, configuration information is sent.

[0185] The optional implementation of step S610 can refer to the optional implementation of step S410 in Figure 4 and other related parts in the embodiment involved in Figure 4, which will not be repeated here.

[0186] In some embodiments, the network device (such as an access network device) sends configuration information to the terminal, but is not limited thereto, and the configuration information may also be sent to other entities.

[0187] FIG7 is an exemplary flow chart of a method for performing communication on a terminal side according to an embodiment of the present disclosure. The embodiment of the present disclosure relates to a communication method, which is applied to a terminal. As shown in FIG7 , the method includes steps S710 to S720.

[0188] In step S710 , configuration information is received.

[0189] The optional implementation of step S710 can refer to the optional implementation of step S410 in Figure 4 and other related parts in the embodiment involved in Figure 4, which will not be repeated here.

[0190] In some embodiments, the terminal receives configuration information sent by a network device (such as an access network device), but is not limited thereto and may also receive configuration information sent from other entities.

[0191] In step S720, the time-frequency domain density configuration of the downlink PTRS is determined based on the number of downlink PTRS ports.

[0192] The optional implementation of step S720 can refer to the optional implementation of step S420 in Figure 4 and other related parts in the embodiment involved in Figure 4, which will not be repeated here.

[0193] In the communication method involved in the embodiments of the present disclosure, to solve the problem of "indicating the number of PTRS ports" (Problem 1) and the problem of "indicating the density range of each PTRS in the time and frequency domain" (Problem 2) under different local oscillator architectures, the embodiments of the present disclosure provide specific solutions, respectively, making the PTRS configuration more conducive to PN estimation and compensation under the current local oscillator architecture, and improving the overall performance of the system. The technical solutions and specific scenarios for solving the two problems are respectively given below:

[0194] In some embodiments, the distributed local oscillator architecture described in Problem 1 requires indicating the number of PTRS ports and associated DMRS ports to the mid-terminal during downlink transmission. This issue arises because the number of PTRS ports is related to the number of PN sources. When there are multiple independent PN sources, i.e., multiple local oscillators in a distributed local oscillator architecture, each PN source requires a PTRS port for PN estimation.

[0195] Then, the high-level parameter maxNrofPorts configures the maximum number of downlink PTRS antenna ports in each TCI state. If maxNrofPorts is set to 1, the number of scheduled PTRS ports is 1. If maxNrofPorts is set to 2, and the number of TCI states indicated by the DCI and the number of CDM groups corresponding to the DMRS ports are both 2, the terminal will receive two PTRS ports, which are associated with the lowest-indexed DMRS port in the DMRS port group corresponding to the 2 TCI states. If maxNrofPorts is set to 2, the number of TCI states indicated by the DCI is 2, but the number of CDM groups corresponding to the DMRS ports is 1, the terminal will receive 1 PTRS port, which is associated with the lowest-indexed DMRS port in the DMRS ports allocated for PDSCH.

[0196] Here are some examples:

[0197] On the network device (e.g., access network device), taking the distributed local oscillator architecture shown in Figure 5B as an example, two RF chains use their own local oscillators. Therefore, two PTRS ports are required in the downlink to estimate and compensate for the PN generated by their respective local oscillators. The high-level parameter maxNrofPorts is set to 2, and the number of TCI states indicated by the DCI and the number of CDM groups corresponding to the DMRS ports are both 2. The terminal will receive two PTRS ports, which are respectively associated with the lowest-indexed DMRS port in the two DMRS port groups corresponding to the TCI states (which can be recorded as the first DMRS port group and the second DMRS port group).

[0198] In some embodiments, different PTRS time-frequency domain density configuration ranges are required under different local oscillator architectures in Problem 2. The solution is to add new PTRS time-frequency domain density configuration tables for the distributed local oscillator architecture in the protocol, such as Table 3 and Table 4 above. The terminal determines whether to search the RRC tables corresponding to the centralized local oscillator architecture (such as Table 1 and Table 2 above, refer to Table 5.1.6.3-1-1 and Table 5.1.6.3-2-1 in 3GPP TS 38.214) or the RRC tables corresponding to the distributed local oscillator architecture (such as Table 3 and Table 4 above) based on the number of downlink PTRS ports, and then searches for the PTRS time-frequency domain density in the corresponding table in combination with the scheduled MCS and the scheduled bandwidth.

[0199] Here are some examples:

[0200] The network device (such as the access network device) side still takes the distributed local oscillator architecture shown in FIG5B as an example. The two RF chains use their own local oscillators, the high-level parameter maxNrofPorts is set to 2, and the number of TCI states indicated by the DCI and the number of CDM groups corresponding to the DMRS port are both 2. The terminal will receive two PTRS ports, which are respectively associated with the lowest index DMRS port in the DMRS port groups corresponding to the two TCI states (which can be recorded as the first DMRS port group and the second DMRS port group).

[0201] When the terminal learns that there are two PTRS ports that need to be received, it believes that the network device side is a distributed local oscillator architecture. Therefore, the time-frequency domain density of these two PTRS ports will be determined by looking up Table 3 and Table 4 based on the scheduled MCS and the scheduled bandwidth.

[0202] In the embodiments of the present disclosure, some or all of the steps and their optional implementations may be arbitrarily combined with some or all of the steps in other embodiments, or may be arbitrarily combined with the optional implementations of other embodiments.

[0203] The embodiments of the present disclosure also provide an apparatus for implementing any of the above methods. For example, the embodiments of the present disclosure provide an apparatus. The apparatus includes units or modules for implementing each step performed by a terminal in any of the above methods. As another example, another apparatus is provided, including units or modules for implementing each step performed by a network device (e.g., an access network device or a core network device) in any of the above methods.

[0204] It should be understood that the division of the various units or modules in the above devices is merely a division of logical functions. In actual implementation, they may be fully or partially integrated into a physical entity, or they may be physically separated. In addition, the units or modules in the device may be implemented in the form of a processor calling software: for example, the device includes a processor, the processor is connected to a memory, and the memory stores instructions. The processor calls the instructions stored in the memory to implement any of the above methods or implement the functions of the various units or modules of the above devices, wherein the processor is, for example, a general-purpose processor, such as a central processing unit (CPU) or a microprocessor, and the memory is a memory within the device or a memory outside the device. Alternatively, the units or modules in the device can be implemented in the form of hardware circuits, and the functions of some or all of the units or modules can be realized by designing the hardware circuits. The above-mentioned hardware circuits can be understood as one or more processors; for example, in one implementation, the above-mentioned hardware circuit is an application-specific integrated circuit (ASIC), which realizes the functions of some or all of the above units or modules by designing the logical relationship of the components in the circuit; for example, in another implementation, the above-mentioned hardware circuit can be realized by a programmable logic device (PLD). Taking a field programmable gate array (FPGA) as an example, it can include a large number of logic gate circuits, and the connection relationship between the logic gate circuits is configured by configuring the configuration file, thereby realizing the functions of some or all of the above units or modules. All units or modules of the above devices can be realized in the form of software called by the processor, or in the form of hardware circuits, or in part by the form of software called by the processor, and the rest by hardware circuits.

[0205] In the embodiments of the present disclosure, a processor is a circuit with signal processing capabilities. In one implementation, the processor can be a circuit with instruction reading and execution capabilities, such as a central processing unit (CPU), a microprocessor, a graphics processing unit (GPU) (which can be understood as a microprocessor), or a digital signal processor (DSP). In another implementation, the processor can implement certain functions through the logical relationship of a hardware circuit. The logical relationship of the above-mentioned hardware circuit is fixed or reconfigurable. For example, the processor is a hardware circuit implemented by an application-specific integrated circuit (ASIC) or a programmable logic device (PLD), such as an FPGA. In a reconfigurable hardware circuit, the process of the processor loading a configuration document to implement the hardware circuit configuration can be understood as the process of the processor loading instructions to implement the functions of some or all of the above units or modules. In addition, it can also be a hardware circuit designed for artificial intelligence, which can be understood as an ASIC, such as a neural network processing unit (NPU), a tensor processing unit (TPU), a deep learning processing unit (DPU), etc.

[0206] FIG8 is an exemplary structural diagram of a communication device according to an embodiment of the present disclosure. As shown in FIG8 , the communication device 800 may include at least one of a receiving module 801 , a processing module 802 , and a sending module 803 .

[0207] In some embodiments, the communication device 800 may be set in a network device. In this case, the communication device 800 includes a sending module 803 .

[0208] In some embodiments, the sending module 803 is configured to send configuration information, where the configuration information is used to indicate the number of downlink PTRS ports, and the downlink PTRS is used to estimate and compensate for PN generated by a local oscillator used by at least one RF chain.

[0209] In some embodiments, the configuration information includes at least one of the following: the maximum number of downlink PTRS ports; the number of TCI states; and the number of CDM groups corresponding to the DMRS ports.

[0210] In some embodiments, the sending module 803 is configured to perform at least one of the following: sending downlink PTRS configuration information, the downlink PTRS configuration information includes the maximum number of downlink PTRS ports and / or the number of CDM groups corresponding to the DMRS ports; sending DCI, DCI is used to indicate the number of TCI states.

[0211] In some embodiments, the number of downlink PTRS ports is 1 or N, where N is an integer greater than or equal to 2.

[0212] In some embodiments, when the maximum number of downstream PTRS ports is configured as 1, the number of downstream PTRS ports is 1.

[0213] In some embodiments, when the maximum number of downlink PTRS ports is configured as N and N=2, when the number of TCI states is equal to 2 and the number of CDM groups corresponding to the DMRS ports is equal to 2, the number of downlink PTRS ports is 2; or, when the number of TCI states is equal to 1 and / or the number of CDM groups corresponding to the DMRS ports is equal to 1, the number of downlink PTRS ports is 1.

[0214] In some embodiments, when the number of downlink PTRS ports is 2, the two downlink PTRS ports are respectively associated with the lowest index DMRS port in the two DMRS port groups indicating the TCI state.

[0215] In some embodiments, the number of downlink PTRS ports is 1, corresponding to a first time-frequency domain density configuration; or, the number of downlink PTRS ports is N, corresponding to a second time-frequency domain density configuration.

[0216] In some embodiments, the second time-frequency domain density configuration includes: time domain density and frequency domain density; the value of the time domain density is one of the following: 6, 4, 2; the value of the frequency domain density is one of the following: 1, 2.

[0217] In some embodiments, the second time-frequency domain density configuration includes at least one of the following: the MCS of the downlink PTRS scheduling is greater than or equal to the first MCS threshold and less than the second MCS threshold, and the time domain density value is 6; the MCS of the downlink PTRS scheduling is greater than or equal to the second MCS threshold and less than the third MCS threshold, and the time domain density value is 4; the MCS of the downlink PTRS scheduling is greater than or equal to the third MCS threshold and less than the fourth MCS threshold, and the time domain density value is 2.

[0218] In some embodiments, the second time-frequency domain density configuration includes at least one of the following: the bandwidth of the downlink PTRS scheduling is greater than or equal to the first bandwidth threshold and less than the second bandwidth threshold, and the value of the frequency domain density is 1; the bandwidth of the downlink PTRS scheduling is greater than or equal to the second bandwidth threshold and less than the third bandwidth threshold, and the value of the frequency domain density is 2.

[0219] In some embodiments, the communication device 800 may be provided in a terminal. In this case, the communication device 800 includes a receiving module 801 and a processing module 802 .

[0220] In some embodiments, the receiving module 801 is configured to receive configuration information, where the configuration information is used to indicate the number of downlink PTRS ports; the processing module 802 is configured to determine the time-frequency domain density configuration of the downlink PTRS based on the number of downlink PTRS ports; wherein the downlink PTRS is used to estimate and compensate for the PN generated by the local oscillator used by at least one RF chain.

[0221] In some embodiments, the configuration information includes at least one of the following: the maximum number of downlink PTRS ports; the number of TCI states; and the number of code CDM groups corresponding to the DMRS ports.

[0222] In some embodiments, the receiving module 801 is configured to perform at least one of the following: receiving downlink PTRS configuration information, the downlink PTRS configuration information including the maximum number of downlink PTRS ports and / or the number of CDM groups corresponding to the DMRS ports; receiving DCI, the DCI including the number of TCI states.

[0223] In some embodiments, the number of downlink PTRS ports is 1 or N, where N is an integer greater than or equal to 2.

[0224] In some embodiments, when the maximum number of downlink PTRS ports is configured as 1, the number of downlink PTRS ports is configured as 1.

[0225] In some embodiments, when the maximum number of downlink PTRS ports is configured as N and N=2, when the number of TCI states is equal to 2 and the number of CDM groups corresponding to the DMRS ports is equal to 2, the number of downlink PTRS ports is 2; or, when the number of TCI states is equal to 1 and / or the number of CDM groups corresponding to the DMRS ports is equal to 1, the number of downlink PTRS ports is 1.

[0226] In some embodiments, when the number of downlink PTRS ports is 2, the two downlink PTRS ports are respectively associated with the lowest index DMRS port in the two DMRS port groups indicating the TCI state.

[0227] In some embodiments, the processing module 802 is configured to determine that the time-frequency domain density configuration is a first time-frequency domain density configuration when the number of downlink PTRS ports is 1; or, when the number of downlink PTRS ports is N, determine that the time-frequency domain density configuration is a second time-frequency domain density configuration.

[0228] In some embodiments, the second time-frequency domain density configuration includes: time domain density and frequency domain density; the value of the time domain density is one of the following: 6, 4, 2; the value of the frequency domain density is one of the following: 1, 2.

[0229] In some embodiments, the second time-frequency domain density configuration includes at least one of the following: the MCS of the downlink PTRS scheduling is greater than or equal to the first MCS threshold and less than the second MCS threshold, and the time domain density value is 6; the MCS of the downlink PTRS scheduling is greater than or equal to the second MCS threshold and less than the third MCS threshold, and the time domain density value is 4; the MCS of the downlink PTRS scheduling is greater than or equal to the third MCS threshold and less than the fourth MCS threshold, and the time domain density value is 2.

[0230] In some embodiments, the second time-frequency domain density configuration includes at least one of the following: the bandwidth of the downlink PTRS scheduling is greater than or equal to the first bandwidth threshold and less than the second bandwidth threshold, and the value of the frequency domain density is 1; the bandwidth of the downlink PTRS scheduling is greater than or equal to the second bandwidth threshold and less than the third bandwidth threshold, and the value of the frequency domain density is 2.

[0231] Figure 9 is a schematic diagram of the structure of a communication device provided according to an embodiment of the present disclosure. Communication device 900 can be a network device (e.g., an access network device), a terminal, a chip, a chip system, or a processor that supports a network device to implement any of the above methods, or a chip, a chip system, or a processor that supports a terminal to implement any of the above communication methods. Communication device 900 can be used to implement the communication method described in the above method embodiment. For details, please refer to the description of the above method embodiment.

[0232] As shown in Figure 9, the communication device 900 includes one or more processors 901. The processor 901 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, and the central processing unit can be used to control the communication device (such as a base station, a baseband chip, a terminal device, a terminal device chip, a DU or a CU, etc.), execute programs, and process program data. The processor 901 is used to call instructions to enable the communication device 900 to execute any of the above communication methods.

[0233] In some embodiments, the communication device 900 further includes one or more memories 902 for storing instructions. Optionally, all or part of the memories 902 may be located outside the communication device 900.

[0234] In some embodiments, the communication device 900 further includes one or more transceivers 903. When the communication device 900 includes one or more transceivers 903, the communication steps such as sending and receiving in the above method are performed by the transceiver 903, and the other steps are performed by the processor 901.

[0235] In some embodiments, a transceiver may include a receiver and a transmitter, which may be separate or integrated. Optionally, the terms transceiver, transceiver unit, transceiver, and transceiver circuit may be used interchangeably; the terms transmitter, transmitting unit, transmitter, and transmitting circuit may be used interchangeably; and the terms receiver, receiving unit, receiver, and receiving circuit may be used interchangeably.

[0236] Optionally, the communication device 900 further includes one or more interface circuits 904, which are connected to the memory 902. The interface circuits 904 may be configured to receive signals from the memory 902 or other devices, and may be configured to send signals to the memory 902 or other devices. For example, the interface circuits 904 may read instructions stored in the memory 902 and send the instructions to the processor 901.

[0237] The communication device 900 described in the above embodiments may be an access network device, a core network device, an external network device, or a terminal, but the scope of the communication device 900 described in the embodiments of the present disclosure is not limited thereto, and the structure of the communication device 900 may not be limited by FIG. 9 . The communication device may be an independent device or may be part of a larger device. For example, the communication device may be: (1) an independent integrated circuit IC, or a chip, or a chip system or subsystem; (2) a collection of one or more ICs, optionally, the above IC collection may also include a storage component for storing data or programs; (3) an ASIC, such as a modem; (4) a module that can be embedded in other devices; (5) a receiver, a terminal device, an intelligent terminal device, a cellular phone, a wireless device, a handheld device, a mobile unit, an in-vehicle device, a network device, a cloud device, an artificial intelligence device, etc.; (6) other devices.

[0238] The embodiments of the present disclosure further provide a storage medium having instructions stored thereon. When the instructions are executed on the communication device 900, the communication device 900 executes any one of the above communication methods. Optionally, the storage medium is an electronic storage medium. Optionally, the storage medium is a computer-readable storage medium, but may also be a storage medium readable by other devices. Optionally, the storage medium may be a non-transitory storage medium, but may also be a transient storage medium.

[0239] The embodiment of the present disclosure further provides a program product, which, when executed by the communication device 900, enables the communication device 900 to perform any of the above communication methods. Optionally, the program product is a computer program product.

[0240] The embodiment of the present disclosure further provides a computer program, which, when executed on a computer, enables the computer to execute any one of the above communication methods.

[0241] Other embodiments of the present invention will readily occur to those skilled in the art after considering the specification and practicing the invention disclosed herein. This disclosure is intended to cover any variations, uses, or adaptations of the invention that follow from the general principles of the invention and include common knowledge or customary techniques in the art not disclosed herein. The description and examples are to be considered as exemplary only, with the true scope and spirit of the invention being indicated by the following claims.

[0242] It should be understood that the present invention is not limited to the exact construction described above and shown in the drawings, and that various modifications and changes may be made without departing from the scope thereof. The scope of the present invention is limited only by the appended claims.

Claims

1. A communication method, performed by a network device, the method comprising: Configuration information is sent, where the configuration information is used to indicate the number of downlink phase tracking reference signal PTRS ports, where the downlink PTRS is used to estimate and compensate for phase noise PN generated by a local oscillator used by at least one radio frequency chain.

2. The method according to claim 1, wherein: The configuration information includes at least one of the following: Maximum number of downstream PTRS ports; The number of transmission configuration indication TCI states; The number of code division multiplexing (CDM) groups corresponding to the demodulation reference signal (DMRS) port.

3. The method according to claim 2, wherein: The sending of configuration information includes at least one of the following: Sending downlink PTRS configuration information, where the downlink PTRS configuration information includes a maximum number of downlink PTRS ports and / or a number of CDM groups corresponding to the DMRS ports; Send downlink control information DCI, where the DCI is used to indicate the number of the TCI states.

4. The method according to any one of claims 1 to 3, wherein: The number of the downlink PTRS ports is 1 or N, where N is an integer greater than or equal to 2.

5. The method according to claim 4, wherein: When the maximum number of downstream PTRS ports is configured as 1, the number of downstream PTRS ports is 1.

6. The method according to claim 4, wherein: When the maximum number of downstream PTRS ports is configured as N and N is equal to 2, When the number of TCI states is equal to 2 and the number of CDM groups corresponding to the DMRS port is equal to 2, the number of downlink PTRS ports is 2; or, When the number of TCI states is equal to 1 and / or the number of CDM groups corresponding to the DMRS port is equal to 1, the number of downlink PTRS ports is 1.

7. The method according to claim 6, wherein: When the number of the downlink PTRS ports is 2, the two downlink PTRS ports are respectively associated with the lowest index DMRS ports in the two DMRS port groups indicating the TCI state.

8. The method according to any one of claims 4 to 7, wherein: The number of the downlink PTRS ports is 1, corresponding to a first time-frequency domain density configuration; or, the number of the downlink PTRS ports is N, corresponding to a second time-frequency domain density configuration.

9. The method according to claim 8, wherein: The second time-frequency domain density configuration includes: time domain density and frequency domain density; the value of the time domain density is one of the following: 6, 4, 2; the value of the frequency domain density is one of the following: 1, 2.

10. The method according to claim 9, wherein: The second time-frequency domain density configuration includes at least one of the following: The modulation and coding strategy MCS of the downlink PTRS scheduling is greater than or equal to the first MCS threshold and less than the second MCS threshold, and the value of the time domain density is 6; The MCS of the downlink PTRS scheduling is greater than or equal to the second MCS threshold and less than the third MCS threshold, and the value of the time domain density is 4; The MCS of the downlink PTRS scheduling is greater than or equal to the third MCS threshold and less than the fourth MCS threshold, and the time domain density is 2.

11. The method according to claim 9, wherein: The second time-frequency domain density configuration includes at least one of the following: The bandwidth of the downlink PTRS scheduling is greater than or equal to the first bandwidth threshold and less than the second bandwidth threshold, and the value of the frequency domain density is 1; The bandwidth of the downlink PTRS scheduling is greater than or equal to the second bandwidth threshold and less than the third bandwidth threshold, and the value of the frequency domain density is 2.

12. A communication method, executed by a terminal, the method comprising: Receive configuration information, where the configuration information is used to indicate the number of downlink phase tracking reference signal PTRS ports; Determining a time-frequency domain density configuration of a downlink PTRS based on the number of the downlink PTRS ports; The downlink PTRS is used to estimate and compensate for the phase noise PN generated by a local oscillator used by at least one radio frequency chain, and the radio frequency chain corresponds to the local oscillator in a one-to-one manner.

13. The method according to claim 12, wherein: The configuration information includes at least one of the following: Maximum number of downstream PTRS ports; The number of transmission configuration indication TCI states; The number of code division multiplexing (CDM) groups corresponding to the demodulation reference signal (DMRS) port.

14. The method according to claim 13, wherein: The receiving configuration information includes at least one of the following: Receive downlink PTRS configuration information, where the downlink PTRS configuration information includes a maximum number of downlink PTRS ports and / or a number of CDM groups corresponding to the DMRS ports; A DCI is received, the DCI including the number of the TCI states.

15. The method according to any one of claims 12 to 14, wherein: The number of the downlink PTRS ports is 1 or N, where N is an integer greater than or equal to 2.

16. The method according to claim 15, wherein: When the maximum number of downstream PTRS ports is configured as 1, the number of downstream PTRS ports is configured as 1.

17. The method according to claim 15, wherein: When the maximum number of downstream PTRS ports is configured as N and N is equal to 2, When the number of TCI states is equal to 2 and the number of CDM groups corresponding to the DMRS port is equal to 2, the number of downlink PTRS ports is 2; or, When the number of TCI states is equal to 1 and / or the number of CDM groups corresponding to the DMRS port is equal to 1, the number of downlink PTRS ports is 1.

18. The method according to claim 17, wherein: When the number of the downlink PTRS ports is 2, the two downlink PTRS ports are respectively associated with the lowest index DMRS ports in the two DMRS port groups indicating the TCI state.

19. The method according to any one of claims 15 to 18, wherein: The determining, based on the number of the downlink PTRS ports, the time-frequency domain density configuration of the downlink PTRS includes: When the number of the downlink PTRS ports is 1, determining that the time-frequency domain density configuration is a first time-frequency domain density configuration; or, When the number of the downlink PTRS ports is N, the time-frequency domain density configuration is determined to be a second time-frequency domain density configuration.

20. The method according to claim 19, wherein: The second time-frequency domain density configuration includes: time domain density and frequency domain density; the value of the time domain density is one of the following: 6, 4, 2; the value of the frequency domain density is one of the following: 1, 2.

21. The method according to claim 20, wherein: The second time-frequency domain density configuration includes at least one of the following: The modulation and coding strategy MCS of the downlink PTRS scheduling is greater than or equal to the first MCS threshold and less than the second MCS threshold, and the value of the time domain density is 6; The MCS of the downlink PTRS scheduling is greater than or equal to the second MCS threshold and less than the third MCS threshold, and the value of the time domain density is 4; The MCS of the downlink PTRS scheduling is greater than or equal to the third MCS threshold and less than the fourth MCS threshold, and the value of the time domain density is 2.

22. The method according to claim 20, wherein: The second time-frequency domain density configuration includes at least one of the following: The bandwidth of the downlink PTRS scheduling is greater than or equal to the first bandwidth threshold and less than the second bandwidth threshold, and the value of the frequency domain density is 1; The bandwidth of the downlink PTRS scheduling is greater than or equal to the second bandwidth threshold and less than the third bandwidth threshold, and the value of the frequency domain density is 2.

23. A communication device, comprising: The sending module is configured to send configuration information, wherein the configuration information is used to indicate the number of downlink phase tracking reference signal PTRS ports, and the downlink PTRS is used to estimate and compensate for the phase noise PN generated by the local oscillator used by at least one RF chain, and the RF chain corresponds to the local oscillator one by one.

24. A communication device, comprising: A receiving module, configured to receive configuration information, where the configuration information is used to indicate the number of downlink phase tracking reference signal PTRS ports; A processing module, configured to determine a time-frequency domain density configuration of a downlink PTRS based on the number of the downlink PTRS ports; The downlink PTRS is used to estimate and compensate for the phase noise PN generated by a local oscillator used by at least one radio frequency chain, and the radio frequency chain corresponds to the local oscillator in a one-to-one manner.

25. A communication device comprising: at least one processor; A memory coupled to the at least one processor, the memory storing executable instructions, wherein when the executable instructions are executed by the at least one processor, the communication device executes the method according to any one of claims 1 to 22.

26. A storage medium, wherein: The storage medium stores instructions, which, when executed in a communication device, enable the communication device to execute the method according to any one of claims 1 to 22.

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