Communication method, terminal, network device and communication system

Abstract

The invention relates to a communication method, a terminal, network equipment and a communication system. The communication method comprises: a terminal determining a default TCI state of a first PDSCH according to a third frequency offset; wherein the third frequency offset is a first frequency offset between the first PDSCH and a PDCCH (Physical Downlink Control Channel) which schedules the first PDSCH, or the third frequency offset is a second frequency offset between the first PDSCH and a second PDSCH, and the second PDSCH is earlier than the first PDSCH in the time domain; and the terminal receives the first PDSCH according to the default TCI state. In the embodiment of the invention, the terminal can receive the first PDSCH by using a better default TCI state and a better receiving beam, so that the reliability and the spectrum efficiency of downlink transmission can be effectively improved.

Description

Communication method, terminal, network device and communication system Technical Field

[0001] The present disclosure relates to the field of communication technologies, and in particular to a communication method, a terminal, a network device, and a communication system. Background Art

[0002] The beam of downlink transmission is configured and indicated by the transmission configuration indication (TCI) status. Taking the downlink channel as an example, the beam used by the physical downlink shared channel (PDSCH) is indicated by the downlink control information (DCI). Taking the user equipment (UE) receiving PDSCH as an example, the UE first decodes the DCI and obtains the TCI status from it, thereby determining the analog beam used to receive the PDSCH. When the time interval between the physical downlink control channel (PDCCH) carrying the DCI and the PDSCH it schedules is small, due to the UE capability and the complexity of DCI decoding, sometimes the UE cannot obtain the TCI status by decoding the DCI in time. Therefore, how to receive PDSCH is an issue that needs to be considered and resolved.

[0003] Summary of the Invention

[0004] The embodiments of the present disclosure provide a communication method, a terminal, a network device, and a communication system.

[0005] According to a first aspect of an embodiment of the present disclosure, a communication method is proposed, which is executed by a terminal. The method includes:

[0006] Determining a default TCI state for a first PDSCH according to a third frequency offset; wherein the third frequency offset is a first frequency offset between the first PDSCH and a PDCCH that schedules the first PDSCH, or the third frequency offset is a second frequency offset between the first PDSCH and a second PDSCH, where the second PDSCH is earlier than the first PDSCH in the time domain;

[0007] The first PDSCH is received according to the default TCI state.

[0008] According to a second aspect of an embodiment of the present disclosure, a communication method is provided, which is performed by a network device. The method includes:

[0009] Send a first PDSCH; the first PDSCH is used for the terminal to receive according to the default TCI state of the first PDSCH, the default TCI state of the first PDSCH is determined by the terminal according to a third frequency offset, the third frequency offset is the first frequency offset between the first PDSCH and the PDCCH that schedules the first PDSCH, or the third frequency offset is the second frequency offset between the first PDSCH and the second PDSCH, and the second PDSCH is earlier than the first PDSCH in the time domain.

[0010] According to a third aspect of an embodiment of the present disclosure, a terminal is provided, including:

[0011] a processing module, configured to determine a default TCI state of a first PDSCH according to a third frequency offset; wherein the third frequency offset is a first frequency offset between the first PDSCH and a PDCCH that schedules the first PDSCH, or the third frequency offset is a second frequency offset between the first PDSCH and a second PDSCH, and the second PDSCH is earlier than the first PDSCH in the time domain;

[0012] A transceiver module is configured to receive the first PDSCH according to the default TCI state.

[0013] According to a fourth aspect of an embodiment of the present disclosure, a network device is provided, including:

[0014] A transceiver module is used to send a first PDSCH; the first PDSCH is used for the terminal to receive according to the default TCI state of the first PDSCH, the default TCI state of the first PDSCH is determined by the terminal according to a third frequency offset, and the third frequency offset is the first frequency offset between the first PDSCH and the PDCCH that schedules the first PDSCH, or the third frequency offset is the second frequency offset between the first PDSCH and the second PDSCH, and the second PDSCH is earlier than the first PDSCH in the time domain.

[0015] According to a fifth aspect of an embodiment of the present disclosure, a terminal is provided, including:

[0016] one or more processors;

[0017] The terminal is used to execute the communication method proposed in the first aspect of the embodiment of this disclosure.

[0018] According to a sixth aspect of an embodiment of the present disclosure, a network device is provided, including:

[0019] one or more processors;

[0020] The network device is used to execute the communication method proposed in the second aspect of the embodiment of the present disclosure.

[0021] According to the seventh aspect of an embodiment of the present disclosure, a communication system is proposed, comprising a terminal and a network device, wherein the terminal is configured to implement the communication method proposed in the first aspect of the embodiment of the present disclosure, and the network device is configured to implement the communication method proposed in the second aspect of the embodiment of the present disclosure.

[0022] According to an eighth aspect of an embodiment of the present disclosure, a storage medium is proposed, which stores instructions. When the instructions are executed on a communication device, the communication device executes the communication method proposed in the first aspect or the second aspect of the embodiment of the present disclosure.

[0023] In the disclosed embodiment, a terminal may determine a default TCI state for a first PDSCH based on a first frequency offset between the first PDSCH and the PDCCH that schedules the first PDSCH, or a second frequency offset between the first PDSCH and a second PDSCH, so that the terminal may use a better default TCI state and a better receive beam to receive the first PDSCH. This effectively improves downlink transmission reliability and spectrum efficiency. BRIEF DESCRIPTION OF THE DRAWINGS

[0024] In order to more clearly illustrate the technical solutions in the embodiments of the present disclosure, the following drawings required for describing the embodiments are introduced. The following drawings are merely some embodiments of the present disclosure and do not impose specific limitations on the protection scope of the present disclosure.

[0025] FIG1 is an exemplary schematic diagram of the architecture of a communication system provided according to an embodiment of the present disclosure.

[0026] FIG2 is an exemplary schematic diagram of a beam squint phenomenon provided according to an embodiment of the present disclosure.

[0027] FIG3A is a schematic diagram of an exemplary interaction of a communication method provided according to an embodiment of the present disclosure.

[0028] FIG3B is an exemplary interaction diagram of a communication method provided according to an embodiment of the present disclosure.

[0029] FIG4A is a schematic diagram of an exemplary flow chart of a communication method provided according to an embodiment of the present disclosure.

[0030] FIG4B is a schematic diagram of an exemplary flow chart of a communication method provided according to an embodiment of the present disclosure.

[0031] FIG4C is a schematic diagram of an exemplary flow chart of a communication method provided according to an embodiment of the present disclosure.

[0032] FIG5 is a schematic diagram of an exemplary flow chart of a communication method provided according to an embodiment of the present disclosure.

[0033] FIG6A is an exemplary schematic diagram of the structure of a terminal provided according to an embodiment of the present disclosure.

[0034] FIG6B is an exemplary schematic diagram of the structure of a network device provided according to an embodiment of the present disclosure.

[0035] FIG7A is an exemplary schematic diagram of the structure of a communication device provided according to an embodiment of the present disclosure.

[0036] FIG7B is an exemplary schematic diagram of the structure of a chip provided according to an embodiment of the present disclosure. DETAILED DESCRIPTION

[0037] The embodiments of the present disclosure provide a communication method, a terminal, a network device, and a communication system.

[0038] In a first aspect, an embodiment of the present disclosure proposes a communication method, which is executed by a terminal, and the method includes: determining a default TCI state of a first PDSCH based on a third frequency offset; wherein the third frequency offset is a first frequency offset between the first PDSCH and the PDCCH that schedules the first PDSCH, or the third frequency offset is a second frequency offset between the first PDSCH and a second PDSCH, and the second PDSCH is earlier than the first PDSCH in the time domain; receiving the first PDSCH according to the default TCI state.

[0039] In the above embodiment, the terminal can determine the default TCI state of the first PDSCH based on the first frequency offset between the first PDSCH and the PDCCH that schedules the first PDSCH, or the second frequency offset between the first PDSCH and the second PDSCH, so that the terminal can use a better default TCI state and a better receive beam to receive the first PDSCH. Thus, the reliability and spectrum efficiency of downlink transmission can be effectively improved.

[0040] In combination with some embodiments of the first aspect, in some embodiments, the method further includes: obtaining first information, the first information being used to indicate a first threshold value or multiple second threshold values; determining the default TCI state of the first PDSCH based on the third frequency offset includes: determining the default TCI state of the first PDSCH based on the first information and the third frequency offset.

[0041] In the above embodiment, the terminal obtains the first information and, based on the above-mentioned third frequency offset and the first threshold value or multiple second threshold values ​​indicated by the first information, can determine whether the first PDSCH and PDCCH are farther or closer in the frequency domain, which is conducive to accurately determining the default TCI state of the first PDSCH.

[0042] In combination with some embodiments of the first aspect, in some embodiments, the determining of the default TCI state of the first PDSCH based on the first information and the third frequency offset includes at least one of the following: the first frequency offset is less than or equal to the first threshold value, and the TCI state of the PDCCH is determined to be the default TCI state of the first PDSCH; the first frequency offset is less than or equal to the minimum threshold value among the multiple second threshold values, and the TCI state of the PDCCH is determined to be the default TCI state of the first PDSCH; the first frequency offset is greater than the smaller threshold value of the two second threshold values ​​and less than or equal to the larger threshold value of the two second threshold values, and the TCI state corresponding to the code point corresponding to the TCI state of the PDCCH is determined to be the default TCI state of the first PDSCH after the code point is offset by the first number of code points as the starting point, and the first number is related to at least one of the two second threshold values.

[0043] In the above embodiment, when the first frequency offset between the first PDSCH and the PDCCH that schedules the first PDSCH is less than or equal to the first threshold value, or when the first frequency offset between the first PDSCH and the PDCCH that schedules the first PDSCH is less than or equal to the minimum threshold value among multiple second threshold values, it indicates that the first PDSCH and the PDCCH are close in the frequency domain. At this time, the influence of the beam squint factor is small, and the TCI state of the PDCCH can be used as the default TCI state of the first PDSCH to receive the first PDSCH. The receiving beam corresponding to the default TCI state is close to the optimal receiving beam. In an optional implementation method, combined with the multiple second threshold values, the spatial beam offset can be determined according to the frequency offset in the frequency domain, so that the terminal can determine a better default TCI state and a better receiving beam.

[0044] In combination with some embodiments of the first aspect, in some embodiments, the method further includes: when the first frequency offset is greater than the first threshold value, ignoring the received signal of the transceiver unit (TXRU) or the antenna panel.

[0045] In the above embodiment, when the first frequency offset between the first PDSCH and the PDCCH that schedules the first PDSCH is greater than the first threshold value, it indicates that the first PDSCH is far away from the PDCCH in the frequency domain. At this time, the influence of the beam squint factor is relatively large. Using the TCI state of the PDCCH as the default TCI state of the first PDSCH to receive the first PDSCH will cause the receiving beam corresponding to the default TCI state to differ greatly from the optimal receiving beam due to beam squint, resulting in a decrease in the received signal strength. Therefore, the terminal ignores the receiving signal of the TXRU or antenna panel to ensure the reliability of downlink transmission.

[0046] In combination with some embodiments of the first aspect, determining the default TCI state of the first PDSCH based on the first information and the third frequency offset includes: determining that the TCI state of the second PDSCH that meets the first condition is the default TCI state of the first PDSCH, and the first condition includes one of the following: the second frequency offset is less than or equal to the first threshold value; the second frequency offset is less than or equal to the minimum threshold value among the multiple second threshold values.

[0047] In the above embodiment, when the second frequency offset between the first PDSCH and the second PDSCH is less than or equal to the first threshold value, or the second frequency offset between the first PDSCH and the second PDSCH is less than or equal to the minimum threshold value among multiple second threshold values, it indicates that the first PDSCH and the second PDSCH are close in the frequency domain, and it also means that the beam squint degree of the first PDSCH and the second PDSCH is basically the same. Therefore, the TCI state of the second PDSCH can be used as the default TCI state of the first PDSCH to receive the first PDSCH, and the receiving beam corresponding to the default TCI state is close to the optimal receiving beam.

[0048] In combination with some embodiments of the first aspect, in some embodiments, the first condition also includes at least one of the following: in the PDSCH received by the terminal, the second PDSCH is closest to the first PDSCH in the time domain; the second PDSCH is correctly received.

[0049] In the above embodiment, the terminal also needs to consider conditions such as whether the time domain position of the second PDSCH is close to that of the first PDSCH and whether the second PDSCH is correctly received, and use the TCI state of the second PDSCH that meets the conditions as the default TCI state of the first PDSCH, so that the terminal can use a better default TCI state and a better receiving beam to receive the first PDSCH.

[0050] In the second aspect, an embodiment of the present disclosure proposes a communication method, which is executed by a network device, and the method includes: sending a first PDSCH; the first PDSCH is used for the terminal to receive according to the default TCI state of the first PDSCH, and the default TCI state of the first PDSCH is determined by the terminal according to a third frequency offset, and the third frequency offset is the first frequency offset between the first PDSCH and the PDCCH that schedules the first PDSCH, or the third frequency offset is the second frequency offset between the first PDSCH and the second PDSCH, and the second PDSCH is earlier than the first PDSCH in the time domain.

[0051] In combination with some embodiments of the second aspect, in some embodiments, the method further includes: sending first information, wherein the first information is used to indicate a first threshold value or multiple second threshold values, and the first information is used by the terminal to determine the default TCI state of the first PDSCH.

[0052] In combination with some embodiments of the second aspect, in some embodiments, the first information is used by the terminal to determine the default TCI state of the first PDSCH through at least one of the following items: the first frequency offset is less than or equal to the first threshold value, and the TCI state of the PDCCH is determined to be the default TCI state of the first PDSCH; the first frequency offset is less than or equal to the minimum threshold value among the multiple second threshold values, and the TCI state of the PDCCH is determined to be the default TCI state of the first PDSCH; the first frequency offset is greater than the smaller threshold value of the two second threshold values ​​and less than or equal to the larger threshold value of the two second threshold values, and the TCI state corresponding to the code point corresponding to the TCI state of the PDCCH is determined to be the default TCI state of the first PDSCH after the code point is offset by the first number of code points as the starting point, and the first number is related to at least one of the two second threshold values.

[0053] In combination with some embodiments of the second aspect, in some embodiments, the first information is used by the terminal to ignore the received signal of the TXRU or antenna panel when the first frequency offset is greater than the first threshold value.

[0054] In combination with some embodiments of the second aspect, in some embodiments, the first information is used by the terminal to determine that the TCI state of the second PDSCH that meets the first condition is the default TCI state of the first PDSCH, and the first condition includes one of the following: the second frequency offset is less than or equal to the first threshold value; the second frequency offset is less than or equal to the minimum threshold value among the multiple second threshold values.

[0055] In combination with some embodiments of the second aspect, in some embodiments, the first condition also includes at least one of the following: in the PDSCH received by the terminal, the second PDSCH is closest to the first PDSCH in the time domain; the second PDSCH is correctly received.

[0056] In the third aspect, an embodiment of the present disclosure proposes a terminal, comprising: a processing module, used to determine the default TCI state of the first PDSCH based on a third frequency offset; wherein the third frequency offset is the first frequency offset between the first PDSCH and the PDCCH that schedules the first PDSCH, or the third frequency offset is the second frequency offset between the first PDSCH and the second PDSCH, and the second PDSCH is earlier than the first PDSCH in the time domain; a transceiver module, used to receive the first PDSCH according to the default TCI state.

[0057] In the fourth aspect, an embodiment of the present disclosure proposes a network device, including: a transceiver module for sending a first PDSCH; the first PDSCH is used for the terminal to receive according to the default TCI state of the first PDSCH, and the default TCI state of the first PDSCH is determined by the terminal based on a third frequency offset, and the third frequency offset is the first frequency offset between the first PDSCH and the PDCCH that schedules the first PDSCH, or the third frequency offset is the second frequency offset between the first PDSCH and the second PDSCH, and the second PDSCH is earlier than the first PDSCH in the time domain.

[0058] In a fifth aspect, an embodiment of the present disclosure proposes a terminal, comprising: one or more processors; wherein the terminal is used to execute the method described in the first aspect and the optional implementation manner of the first aspect.

[0059] In a sixth aspect, an embodiment of the present disclosure proposes a network device, comprising: one or more processors; wherein the network device is used to execute the method described in the second aspect and the optional implementation manner of the second aspect.

[0060] In the seventh aspect, an embodiment of the present disclosure proposes a communication system, which includes a terminal and a network device, wherein the terminal is configured to implement the method described in the first aspect and the optional implementation method of the first aspect, and the network device is configured to implement the method described in the second aspect and the optional implementation method of the second aspect.

[0061] In an eighth aspect, an embodiment of the present disclosure proposes a storage medium storing instructions, which, when executed on a communication device, enables the communication device to execute the method described in the first and second aspects, and the optional implementation of the first and second aspects.

[0062] In a ninth aspect, an embodiment of the present disclosure proposes a program product. When the program product is executed by a communication device, the communication device executes the method described in the first and second aspects, and the optional implementation methods of the first and second aspects.

[0063] In a tenth aspect, an embodiment of the present disclosure proposes a computer program, which, when executed on a computer, enables the computer to execute the methods described in the first and second aspects, and the optional implementations of the first and second aspects.

[0064] In an eleventh aspect, an embodiment of the present disclosure provides a chip or a chip system, wherein the chip or chip system includes a processing circuit configured to execute the method described in accordance with the first and second aspects, and the optional implementations of the first and second aspects.

[0065] It is understandable that the above-mentioned terminals, network devices, communication systems, storage media, program products, computer programs, chips, or chip systems are all used to perform the methods proposed in 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.

[0066] 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.

[0067] 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.

[0068] 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.

[0069] 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.

[0070] In the embodiments of the present disclosure, “plurality” refers to two or more.

[0071] In some embodiments, the terms "at least one," "one or more," "a plurality of," "multiple," etc. may be used interchangeably.

[0072] In some embodiments, descriptions such as "at least one of A and B," "A and / or B," "A in one case, B in another case," or "in response to one case A, in response to 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 above is also applicable when there are more branches such as A, B, and C.

[0073] 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.

[0074] 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.

[0075] 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.

[0076] In some embodiments, terms such as "in response to...", "in response to determining...", "in the case of...", "at the time of...", "when...", "if...", "if...", etc. can be used interchangeably.

[0077] 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.

[0078] In some embodiments, devices and equipment can be interpreted as physical or virtual, and their names are not limited to the names recorded in the embodiments. In some cases, they can also be understood as "equipment", "device", "circuit", "network element", "node", "function", "unit", "section", "system", "network", "chip", "chip system", "entity", "subject", etc.

[0079] In some embodiments, "network" can be interpreted as devices included in the network, such as access network equipment, core network equipment, etc.

[0080] In some embodiments, "access network device (AN device)" may also be referred to as "radio access network device (RAN device)", "base station (BS)", "radio base station", "fixed station", and in some embodiments may also be understood as "node", "access point", "transmission point (TP)", "reception point (RP)", "transmission and / or 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)", etc.

[0081] In some embodiments, "terminal" or "terminal device" may be referred to as "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.

[0082] In some embodiments, obtaining data, information, etc. may comply with the laws and regulations of the country where the data is obtained.

[0083] In some embodiments, data, information, etc. may be obtained with the user's consent.

[0084] 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.

[0085] FIG1 is a schematic diagram illustrating the architecture of a communication system according to an embodiment of the present disclosure. As shown in FIG1 , a communication system 100 includes a terminal 101 and a network device 102 .

[0086] In some embodiments, the terminal 101 includes, for example, a mobile phone, a wearable device, an Internet of Things device, a car with communication function, a smart car, a tablet computer, 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.

[0087] In some embodiments, the network device 102 includes, for example, an access network device. Optionally, the network device 102 also includes, for example, a core network device. The access network device is a node or device that connects the terminal 101 to a wireless network. The access network device may include, but is not limited to, at least one of an evolved NodeB (eNB), a next generation evolved NodeB (ng-eNB), a next generation NodeB (gNB), a NodeB (NB), a home nodeB (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 baseband unit (BBU), a mobile switching center, a base station in a 6G communication system, an open RAN, a cloud RAN, a base station in other communication systems, and an access node in a Wi-Fi system.

[0088] In some embodiments, the technical solution of the present disclosure can be applied to the Open RAN architecture. In this case, the interfaces between or within the access 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.

[0089] 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 access 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.

[0090] 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 proposed in 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 proposed in the embodiment of the present disclosure is also applicable to similar technical problems.

[0091] The following embodiments of the present disclosure may be applied to the communication system 100 shown in FIG1 , or a portion thereof, but are not limited thereto. The entities shown in FIG1 are illustrative only. The communication system may include all or part of the entities shown in FIG1 , or may include other entities outside of FIG1 . The number and form of the entities are arbitrary, and the entities may be physical or virtual. The connection relationships between the entities are illustrative only. The entities may be connected or disconnected, and the connection may be in any manner, including direct or indirect, wired or wireless.

[0092] 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 access technology (RAT), 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).

[0093] To meet the growing demand for higher data rates, wireless communications require larger bandwidth radio spectrum resources. However, existing spectrum resources in the mid- and low-frequency bands are already quite congested, leading the wireless communications field to explore higher frequency resources, such as millimeter wave (mmWave), sub-terahertz (subTHz), and terahertz (THz). Large bandwidths are relatively easy to obtain in these frequency bands, but these high-frequency resources suffer from extremely severe propagation losses, resulting in very limited transmission range and coverage. In this situation, large-scale antenna arrays must be used to extend transmission range and enhance coverage through beamforming. Due to the large aperture of the antenna array, the beams formed are narrower, with fewer multipath components, and primarily line-of-sight (LOS) transmission.

[0094] In large-scale antenna arrays, beam squint may occur under large bandwidth conditions. In other words, a given precoding vector may form beams with different directions at different frequencies (for example, different subcarriers in an orthogonal frequency-division multiplexing (OFDM) system). Figure 2 is an exemplary diagram of the beam squint phenomenon according to an embodiment of the present disclosure. As shown in Figure 2, the precoding vector The beam formed at frequency f0 points in the direction of π / 3, while at frequency The formed beam points in the direction of π / 4.

[0095] In actual transmission, the beam squint phenomenon may cause the beam formed on certain frequency resources to deviate from the expected direction, which will not only interfere with receivers in other directions (such as UE), but also cause a decrease in beamforming gain. For example, the normalized beamforming gain is defined below to quantitatively illustrate the decrease in beamforming gain caused by beam squint. Optionally, the normalized beamforming gain is the ratio of the beamforming gain taking beam squint into account (i.e., the beamforming gain in actual transmission) to the beamforming gain without taking beam squint into account. Taking the transmitting antenna array as a uniform linear array (ULA) as an example, the normalized beamforming gain can be expressed as:

[0096] in:

[0097] G(N,d,r,θ) is the normalized beamforming gain;

[0098] N is the number of antennas in the ULA array;

[0099] d is the spacing between adjacent antennas in the ULA;

[0100] θ is the direction angle of the target receiver;

[0101] r is the ratio of the target frequency to the reference frequency;

[0102] λ0 is the reference wavelength, which is the ratio of the speed of light c to the reference frequency. The reference frequency can theoretically be any frequency, with no restrictions. Typical values ​​include the following: carrier frequency; center frequency; frequencies of the center / lowest / highest subcarriers; and frequencies determined based on antenna spacing.

[0103] Clearly, the reduction in beamforming gain due to beam squint depends not only on the number of antennas in the transmit antenna array (N) and the spacing between adjacent antennas (d), but also on the frequency offset (r) and the azimuth angle (θ) of the target receiver (e.g., UE). In other words, different UEs are affected differently by beam squint. For example, UEs located in the array's boresight (θ = π / 2) are not affected at all by beam squint. UEs further from the boresight are more affected by beam squint.

[0104] On the other hand, to reduce antenna power consumption, complexity, and deployment costs, transceivers typically employ hybrid beamforming technology. This leverages the combined optimization of analog beamforming in the RF front-end and digital beamforming in the digital back-end to achieve a compromise between beamforming flexibility and cost. Furthermore, the vast majority of beamforming gain comes from analog beamforming. To maximize analog beamforming gain, the 5G NR system defines a beam management process that allows the transceiver to select the optimal analog beam from its candidate analog beams, thereby achieving precise alignment of the analog beams.

[0105] The configuration and indication of analog beams are completed by dedicated signaling. The beams for downlink transmission are configured and indicated by the transmission configuration indication (TCI) status. The beams for uplink transmission are configured and indicated by spatial relation information (spatialrelationinfo). However, due to different purposes, the beams used by different physical channels and even different reference signals are configured and indicated by different signaling. Taking the downlink channel as an example, the beams used by the physical downlink control channel (PDCCH) and the physical downlink shared channel (PDSCH) are indicated by the media access control (MAC) control element (CE) and downlink control information (DCI), respectively.

[0106] Taking the example of a UE receiving a PDSCH, the UE first decodes the DCI to obtain the TCI status, thereby determining the simulated beam used for PDSCH reception. In particular, when the time interval (K0) between the PDCCH carrying the DCI and the PDSCH it schedules is small, the UE may not be able to obtain the TCI status in time after decoding the DCI, due to UE capabilities and the complexity of DCI decoding.

[0107] In some implementations, in the above case, the UE uses the default TCI state to receive the PDSCH. In some implementations, the UE uses the TCI state of the PDCCH that schedules the PDSCH as the default TCI state of the PDSCH.

[0108] In future communication systems, such as 6G systems, large bandwidths and multiple antennas will be more widely used, making beam squint unavoidable. For a UE with severe beam squint, if K0 is small and the PDCCH and the PDSCH it schedules are far apart in the frequency domain, using the PDCCH's TCI state as the default TCI state for PDSCH reception will cause the receive beam corresponding to the default TCI state to deviate significantly from the optimal receive beam due to beam squint, reducing the received signal strength, further degrading downlink transmission reliability and spectrum efficiency.

[0109] FIG3A is an interactive diagram of a communication method according to an embodiment of the present disclosure. As shown in FIG3A , the embodiment of the present disclosure relates to a communication method, and the method includes:

[0110] Step S3101: The network device sends the first information to the terminal.

[0111] In some embodiments, the first information is used to indicate a first threshold value or multiple second threshold values. For example, the first information is used to indicate the first threshold value. For another example, the first information is used to indicate N second threshold values r offset,i , i = 0, 1,..., N - 1, r offset,0 <r offset,1 <... <roffset,N - 1, where N is an integer greater than or equal to 2. In some embodiments, the first information includes the first threshold value or multiple second threshold values.

[0112] In some embodiments, the first information is used for the terminal to determine the default TCI state of the first PDSCH. In some embodiments, the first information is used for the terminal to ignore the received signal of the transceiver unit (TXRU) or the antenna panel. In the embodiments of the present disclosure, the name of the first information is not limited, and it is, for example, "threshold indication", etc.

[0113] In some embodiments, the first information is carried in at least one of the following: DCI; MAC CE; radio resource control (RRC).

[0114] In some embodiments, step S3101 is an optional step. For example, the first information can be predefined by the protocol. For example, the above first threshold value or multiple second threshold values can be predefined by the protocol or be default values.

[0115] Step S3102: The terminal determines the default TCI state of the first PDSCH according to the first information and the first frequency offset.

[0116] In some embodiments, the terminal determines the first frequency offset, and the first frequency offset is the frequency offset between the first PDSCH and the PDCCH scheduling the first PDSCH. For example, the first frequency offset can be expressed as or or or but not limited thereto. The embodiments of the present disclosure do not limit the determination method of the first frequency offset. Among them, f PDSCH is the first frequency of the first PDSCH in the frequency domain, and f PDCCH is the second frequency of the PDCCH in the frequency domain.

[0117] In some embodiments, the first frequency is the center frequency, the lowest frequency or the highest frequency of the first PDSCH in the frequency domain.

[0118] In some embodiments, the second frequency is the center frequency, the lowest frequency, or the highest frequency of the PDCCH in the frequency domain.

[0119] In some embodiments, when the first frequency offset is less than or equal to a first threshold value, the terminal determines that the TCI state of the PDCCH is the default TCI state of the first PDSCH. According to the above embodiment, when the first frequency offset between the first PDSCH and the PDCCH that schedules the first PDSCH is less than or equal to the first threshold value, it indicates that the first PDSCH and the PDCCH are close in the frequency domain. At this time, the influence of the beam squint factor is small, and the TCI state of the PDCCH can be used as the default TCI state of the first PDSCH to receive the first PDSCH. The receiving beam corresponding to the default TCI state is close to the optimal receiving beam.

[0120] In some embodiments, when the first frequency offset is less than or equal to the minimum threshold value among multiple second threshold values, the terminal determines that the TCI state of the PDCCH is the default TCI state of the first PDSCH. According to the above embodiment, when the first frequency offset between the first PDSCH and the PDCCH that schedules the first PDSCH is less than or equal to the minimum threshold value among multiple second threshold values, it indicates that the first PDSCH and the PDCCH are close in the frequency domain. At this time, the influence of the beam squint factor is small, and the TCI state of the PDCCH can be used as the default TCI state of the first PDSCH to receive the first PDSCH. The receiving beam corresponding to the default TCI state is close to the optimal receiving beam.

[0121] In some embodiments, when the first frequency offset is greater than the smaller threshold value of the two second threshold values ​​and less than or equal to the larger threshold value of the two second threshold values, the terminal determines that the TCI state corresponding to the code point (codepoint) corresponding to the TCI state of the PDCCH is the starting point and the TCI state corresponding to the offset of the first number of code points is the default TCI state of the first PDSCH, wherein the first number is related to at least one of the two second threshold values. Optionally, the two second threshold values ​​are two adjacent threshold values ​​in the multiple second threshold values. For example, when roffset,i-1<first frequency offset≤r offset,i When (i=1,…,N-1), the TCI state corresponding to the code point corresponding to the TCI state of the PDCCH is offset by i code points starting from the code point corresponding to the TCI state of the PDCCH as the default TCI state of the first PDSCH. It is worth noting that in the above embodiment, the beams corresponding to consecutive code points are continuous in the spatial domain (or angular domain), so that the spatial beam offset can be determined based on the frequency offset in the frequency domain.

[0122] In some embodiments, when the first frequency offset is greater than the first threshold value, the terminal ignores the default TCI state of the first PDSCH (the default TCI state is considered to be unavailable). Accordingly, the terminal ignores the received signal of the transceiver unit (TXRU) or the antenna panel. According to the above embodiment, when the first frequency offset between the first PDSCH and the PDCCH that schedules the first PDSCH is greater than the first threshold value, it indicates that the first PDSCH and the PDCCH are far apart in the frequency domain. At this time, the influence of the beam squint factor is relatively large. Using the TCI state of the PDCCH as the default TCI state of the first PDSCH to receive the first PDSCH will cause the receiving beam corresponding to the default TCI state to differ greatly from the optimal receiving beam due to beam squint, resulting in a decrease in the received signal strength. Therefore, the terminal ignores the default TCI state of the first PDSCH and correspondingly ignores the received signal of the TXRU or the antenna panel to ensure the reliability of downlink transmission.

[0123] In some embodiments, step S3102 is an optional step. For example, the terminal can determine the default TCI state of the first PDSCH based on the second frequency offset between the first PDSCH and the second PDSCH, or determine the default TCI state of the first PDSCH through other optional implementation methods. For example, the terminal can ignore the default TCI state of the first PDSCH.

[0124] Step S3103: The terminal receives the first PDSCH according to the default TCI state.

[0125] In some embodiments, the network device sends the first PDSCH. Optionally, the terminal determines the analog beam used to receive the first PDSCH according to the default TCI state, thereby receiving the first PDSCH.

[0126] In some embodiments, step S3103 is an optional step. For example, the terminal may ignore the default TCI state of the first PDSCH. Accordingly, the terminal ignores the receiving signal of the TXRU or antenna panel, that is, the terminal does not receive the first PDSCH.

[0127] According to the above embodiment, when the time interval (K0) between the PDCCH carrying the DCI and the first PDSCH scheduled by it is small, the terminal can determine the default TCI state of the first PDSCH based on the first frequency offset between the first PDSCH and the PDCCH scheduling the first PDSCH, so that the terminal can use a better default TCI state and a better receive beam to receive the first PDSCH. Thus, the reliability and spectrum efficiency of downlink transmission can be effectively improved.

[0128] In some embodiments, the names of information, etc. are not limited to the names described in the embodiments, and terms such as "information", "message", "signal", "signaling", "report", "configuration", "indication", "instruction", "command", "channel", "parameter", "domain", "field", "symbol", "codebook", "codeword", "codepoint", "bit", "data", and "chip" can be used interchangeably.

[0129] In some embodiments, the terms "downlink", "physical downlink", etc. can be used interchangeably.

[0130] In some embodiments, the terms "downlink control information (DCI)", "downlink (DL) assignment", "DL DCI" and the like may be used interchangeably.

[0131] In some embodiments, the terms "physical downlink shared channel (PDSCH)", "DL data", etc. may be used interchangeably.

[0132] 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.

[0133] In some embodiments, terms such as "send", "transmit", "report", "download", "transmit", "bidirectional transmission", "send and / or receive" can be used interchangeably.

[0134] In some embodiments, terms such as "certain", "preset", "preset", "setting", "indicated", "a certain", "any", and "first" can be interchangeable. "Specific A", "preset A", "preset A", "setting A", "indicated A", "a certain 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, a certain A, any A, or first A, etc., but not limited to this.

[0135] The communication method involved in the embodiments of the present disclosure may include at least one of steps S3101 to S3103. For example, step S3101 may be implemented as an independent embodiment, step S3102 may be implemented as an independent embodiment, and step S3102 + step S3103 may be implemented as independent embodiments, but the present invention is not limited thereto.

[0136] In some embodiments, step S3101, step S3102, and step S3103 are optional, and one or more of these steps may be omitted or replaced in different embodiments.

[0137] In some embodiments, reference may be made to other optional implementations described before or after the description corresponding to FIG. 3A .

[0138] FIG3B is an interactive diagram of a communication method according to an embodiment of the present disclosure. As shown in FIG3B , the embodiment of the present disclosure relates to a communication method, and the method includes:

[0139] Step S3201: The network device sends first information to the terminal.

[0140] The optional implementation of step S3201 can refer to the optional implementation of step S3101 in Figure 3A and other related parts in the embodiment involved in Figure 3A, which will not be repeated here.

[0141] In some embodiments, the first information is used to indicate a first threshold value or a plurality of second threshold values. In some embodiments, the first information is used by the terminal to determine a default TCI state of the first PDSCH.

[0142] In some embodiments, step S3201 is an optional step.

[0143] Step S3202: The terminal determines a default TCI state of the first PDSCH according to the first information and the second frequency offset.

[0144] In some embodiments, the terminal determines a second frequency offset, where the second frequency offset is a frequency offset between the first PDSCH and the second PDSCH, where the second PDSCH is earlier than the first PDSCH in the time domain. For example, the second frequency offset can be expressed as or or or However, the present disclosure does not limit the method for determining the second frequency offset. PDSCH is the first frequency of the first PDSCH in the frequency domain, f PDSCH_j is the third frequency of the second PDSCH (numbered j) in the frequency domain. In some embodiments, the second PDSCH can be described as a historical PDSCH of the first PDSCH.

[0145] In some embodiments, the first frequency is the center frequency, the lowest frequency, or the highest frequency of the first PDSCH in the frequency domain.

[0146] In some embodiments, the third frequency is the center frequency, the lowest frequency, or the highest frequency of the second PDSCH in the frequency domain.

[0147] In some embodiments, the terminal determines that the TCI state of the second PDSCH that meets the first condition is the default TCI state of the first PDSCH. The first condition includes one of the following:

[0148] The second frequency offset is less than or equal to the first threshold;

[0149] The second frequency offset is less than or equal to a minimum threshold value among the plurality of second threshold values.

[0150] According to the above embodiment, when the second frequency offset between the first PDSCH and the second PDSCH is less than or equal to the first threshold value, or the second frequency offset between the first PDSCH and the second PDSCH is less than or equal to the minimum threshold value among multiple second threshold values, it indicates that the first PDSCH and the second PDSCH are close in the frequency domain, and it also means that the beam squint degree of the first PDSCH and the second PDSCH is basically the same. Therefore, the TCI state of the second PDSCH can be used as the default TCI state of the first PDSCH to receive the first PDSCH, and the receiving beam corresponding to the default TCI state is close to the optimal receiving beam.

[0151] In some embodiments, the first condition further includes at least one of the following:

[0152] Among the PDSCHs received by the terminal, the second PDSCH is closest to the first PDSCH in the time domain (that is, the time interval is the shortest);

[0153] The second PDSCH is correctly received.

[0154] In some embodiments, the correct reception of the second PDSCH may be described as the terminal sending an acknowledgment (ACK) of the second PDSCH.

[0155] In some embodiments, step S3202 is an optional step. For example, the terminal can determine the default TCI state of the first PDSCH based on the first frequency offset between the first PDSCH and the PDCCH that schedules the first PDSCH, or determine the default TCI state of the first PDSCH through other optional implementation methods.

[0156] Step S3203: The terminal receives the first PDSCH according to the default TCI state.

[0157] The optional implementation of step S3203 can refer to the optional implementation of step S3103 in Figure 3A and other related parts in the embodiment involved in Figure 3A, which will not be repeated here.

[0158] According to the above embodiment, when the time interval (K0) between the PDCCH carrying the DCI and the first PDSCH scheduled by it is small, the terminal can determine the default TCI state of the first PDSCH based on the second frequency offset between the first PDSCH and the second PDSCH, so that the terminal can use a better default TCI state and a better receive beam to receive the first PDSCH. Thus, the reliability and spectrum efficiency of downlink transmission can be effectively improved.

[0159] The communication method involved in the embodiments of the present disclosure may include at least one of steps S3201 to S3203. For example, step S3201 may be implemented as an independent embodiment, step S3202 may be implemented as an independent embodiment, and step S3202 + step S3203 may be implemented as independent embodiments, but the present invention is not limited thereto.

[0160] In some embodiments, step S3201, step S3202, and step S3203 are optional, and one or more of these steps may be omitted or replaced in different embodiments.

[0161] In some embodiments, reference may be made to other optional implementations described before or after the description corresponding to FIG. 3B .

[0162] 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.

[0163] It can be understood that the embodiment shown in Figure 3B determines the default TCI state of the first PDSCH based on the second frequency offset between the first PDSCH and the second PDSCH. The implementation method is simple. For example, it is only necessary to obtain the second PDSCH and the first threshold value to determine the default TCI state, and the first threshold value can be pre-defined by the protocol, which can further save indication overhead; the embodiment shown in Figure 3A determines the default TCI state of the first PDSCH based on the first frequency offset between the first PDSCH and the PDCCH that schedules the first PDSCH. It has a wide range of applicability. When there is no second PDSCH that meets the first condition, for example, when there is no second PDSCH, or there is a second PDSCH but the second PDSCH is far away from the first PDSCH in the time domain, or the second PDSCH is close to the first PDSCH in the time domain but far away in the frequency domain, etc., the default TCI state of the first PDSCH can be determined and the first PDSCH can be received according to the embodiment shown in Figure 3A.

[0164] FIG4A is a flow chart of a communication method according to an embodiment of the present disclosure. As shown in FIG4A , the embodiment of the present disclosure relates to a communication method, applied to a terminal, and comprising:

[0165] Step S4101: Obtain first information.

[0166] The optional implementation of step S4101 can refer to the optional implementation of step S3101 in Figure 3A and other related parts in the embodiment involved in Figure 3A, which will not be repeated here.

[0167] In some embodiments, the terminal receives the first information sent by the network device, but is not limited thereto, and may also receive the first information sent by other entities.

[0168] In some embodiments, the terminal obtains first information specified by the protocol.

[0169] In some embodiments, the terminal obtains the first information from an upper layer(s).

[0170] In some embodiments, the terminal performs processing to obtain the first information.

[0171] Step S4102: Determine a default TCI state of the first PDSCH according to the first information and the first frequency offset.

[0172] The optional implementation of step S4102 can refer to the optional implementation of step S3102 in Figure 3A and other related parts in the embodiment involved in Figure 3A, which will not be repeated here.

[0173] Step S4103: Receive the first PDSCH according to the default TCI state.

[0174] The optional implementation of step S4103 can refer to the optional implementation of step S3103 in Figure 3A and other related parts in the embodiment involved in Figure 3A, which will not be repeated here.

[0175] In some embodiments, step S4101, step S4102, and step S4103 are optional, and one or more of these steps may be omitted or replaced in different embodiments.

[0176] FIG4B is a flow chart of a communication method according to an embodiment of the present disclosure. As shown in FIG4B , the embodiment of the present disclosure relates to a communication method, applied to a terminal, and comprising:

[0177] Step S4201: Obtain first information.

[0178] The optional implementation of step S4201 can refer to the optional implementation of step S3201 in Figure 3B and other related parts in the embodiment involved in Figure 3B, which will not be repeated here.

[0179] In some embodiments, the terminal receives the first information sent by the network device, but is not limited thereto, and may also receive the first information sent by other entities.

[0180] In some embodiments, the terminal obtains first information specified by the protocol.

[0181] In some embodiments, the terminal obtains the first information from an upper layer(s).

[0182] In some embodiments, the terminal performs processing to obtain the first information.

[0183] Step S4202: Determine a default TCI state of the first PDSCH according to the first information and the second frequency offset.

[0184] The optional implementation of step S4202 can refer to the optional implementation of step S3202 in Figure 3B and other related parts in the embodiment involved in Figure 3B, which will not be repeated here.

[0185] Step S4203: Receive the first PDSCH according to the default TCI state.

[0186] The optional implementation of step S4203 can refer to the optional implementation of step S3203 in Figure 3B and other related parts in the embodiment involved in Figure 3B, which will not be repeated here.

[0187] In some embodiments, step S4201, step S4202, and step S4203 are optional, and one or more of these steps may be omitted or replaced in different embodiments.

[0188] FIG4C is a flow chart of a communication method according to an embodiment of the present disclosure. As shown in FIG4C , the embodiment of the present disclosure relates to a communication method, applied to a terminal, and comprising:

[0189] Step S4301: Determine a default TCI state of the first PDSCH according to the third frequency offset.

[0190] In some embodiments, the third frequency offset may be a first frequency offset between the first PDSCH and the PDCCH that schedules the first PDSCH. Therefore, the terminal determines the default TCI state of the first PDSCH according to the first frequency offset.

[0191] In some embodiments, the third frequency offset may be a second frequency offset between the first PDSCH and the second PDSCH, and the second PDSCH is earlier than the first PDSCH in the time domain. Therefore, the terminal determines the default TCI state of the first PDSCH according to the second frequency offset.

[0192] In some embodiments, the terminal obtains the first information and determines a default TCI state for the first PDSCH based on the third frequency offset and the first information. Alternatively, the terminal determines the default TCI state for the first PDSCH based on the first frequency offset and the first information. Alternatively, the terminal determines the default TCI state for the first PDSCH based on the second frequency offset and the first information.

[0193] In some embodiments, the terminal determines a default TCI state for the first PDSCH based on the third frequency offset and a first threshold value specified by the protocol (or by default). In some embodiments, the terminal determines a default TCI state for the first PDSCH based on the third frequency offset and multiple second threshold values ​​specified by the protocol (or by default).

[0194] The optional implementation of step S4301 can refer to the optional implementation of step S3102 in Figure 3A, step S3202 in Figure 3B, and other related parts in the embodiments involved in Figures 3A and 3B, which will not be repeated here.

[0195] Step S4302: Receive the first PDSCH according to the default TCI state.

[0196] The optional implementation of step S4302 can refer to the optional implementation of step S3103 in Figure 3A, step S3203 in Figure 3B, and other related parts in the embodiments involved in Figures 3A and 3B, which will not be repeated here.

[0197] FIG5 is a flow chart of a communication method according to an embodiment of the present disclosure. As shown in FIG5 , the embodiment of the present disclosure relates to a communication method applied to a network device, the method comprising:

[0198] Step S5101: Send the first information.

[0199] The optional implementation of step S5101 can refer to the optional implementation of step S3101 in Figure 3A, step S3201 in Figure 3B, and other related parts in the embodiments involved in Figures 3A and 3B, which will not be repeated here.

[0200] In some embodiments, step S5101 is an optional step. For example, the first information may be specified by a communication protocol or be a default value.

[0201] Step S5102: Send the first PDSCH.

[0202] In some embodiments, the first PDSCH is used for the terminal to receive according to the default TCI state of the first PDSCH, and the default TCI state of the first PDSCH is determined by the terminal based on a third frequency offset, and the third frequency offset is the first frequency offset between the first PDSCH and the PDCCH that schedules the first PDSCH, or the third frequency offset is the second frequency offset between the first PDSCH and the second PDSCH, and the second PDSCH is earlier than the first PDSCH in the time domain.

[0203] In some embodiments, the first information is used to indicate a first threshold value or a plurality of second threshold values.

[0204] In some embodiments, the first information is used by the terminal to determine a default TCI state of the first PDSCH, so the default TCI state of the first PDSCH is determined by the terminal based on the first information and the third frequency offset. In some embodiments, the first information is used by the terminal to ignore the received signal of the TXRU or antenna panel.

[0205] In some embodiments, the first information is used by the terminal to determine the default TCI state of the first PDSCH by at least one of the following:

[0206] The first frequency offset is less than or equal to the first threshold, determining that the TCI state of the PDCCH is the default TCI state of the first PDSCH;

[0207] The first frequency offset is less than or equal to a minimum threshold value among multiple second threshold values, and the TCI state of the PDCCH is determined to be the default TCI state of the first PDSCH;

[0208] The first frequency offset is greater than the smaller threshold value of the two second threshold values ​​and less than or equal to the larger threshold value of the above two second threshold values. The TCI state corresponding to the code point corresponding to the TCI state of the PDCCH is determined as the starting point and the offset of the first number of code points as the default TCI state of the first PDSCH. The first number is related to at least one of the above two second threshold values.

[0209] In some embodiments, the first information is used by the terminal to ignore the received signal of the TXRU or antenna panel when the first frequency offset is greater than the first threshold value.

[0210] In some embodiments, the first information is used by the terminal to determine that the TCI state of the second PDSCH that meets the first condition is the default TCI state of the first PDSCH, where the first condition includes one of the following:

[0211] The second frequency offset is less than or equal to the first threshold;

[0212] The second frequency offset is less than or equal to a minimum threshold value among the plurality of second threshold values.

[0213] In some embodiments, the first condition further includes at least one of the following:

[0214] Among the PDSCHs received by the terminal, the second PDSCH is closest to the first PDSCH in the time domain;

[0215] The second PDSCH is correctly received.

[0216] In some embodiments, the first PDSCH is used for the terminal to receive according to steps S3102 to S3103 of FIG. 3A .

[0217] In some embodiments, the first PDSCH is used for the terminal to receive according to steps S3202 to S3203 of FIG. 3B .

[0218] In some embodiments, step S5102 can be combined with steps S4102 to S4103 of Figure 4A . In some embodiments, step S5102 can be combined with steps S4202 to S4203 of Figure 4B . In some embodiments, step S5102 can be combined with steps S4301 to S4302 of Figure 4C .

[0219] The embodiments of the present disclosure further provide an apparatus for implementing any of the above methods. For example, an apparatus is provided, comprising units or modules for implementing each step performed by a terminal in any of the above methods. For another example, another apparatus is provided, comprising units or modules for implementing each step performed by a network device (e.g., an access network device) in any of the above methods.

[0220] It should be understood that the division of the various units or modules in the above device 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 device, 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.

[0221] In the embodiments of the present disclosure, the 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 the 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 and implementing 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.

[0222] Figure 6A is a structural diagram of the terminal proposed in an embodiment of the present disclosure. As shown in Figure 6A, the terminal 6100 may include: at least one of a transceiver module 6101, a processing module 6102, etc. In some embodiments, the processing module is used to determine the default TCI state of the first PDSCH based on the third frequency offset. In some embodiments, the transceiver module is used to receive the first PDSCH according to the default TCI state. Optionally, the transceiver module is used to execute at least one of the communication steps such as sending and / or receiving (for example, step S3103, step S3203, but not limited to this) executed by the terminal in any of the above methods, which will not be repeated here. Optionally, the processing module is used to execute at least one of the other steps (for example, step S3102, step S3202, but not limited to this) executed by the terminal in any of the above methods, which will not be repeated here.

[0223] Figure 6B is a schematic diagram of the structure of the network device proposed in an embodiment of the present disclosure. As shown in Figure 6B, the network device 6200 may include: at least one of a transceiver module 6201, a processing module 6202, etc. In some embodiments, the above-mentioned transceiver module is used to send the first PDSCH. Optionally, the above-mentioned transceiver module is used to perform at least one of the communication steps such as sending and / or receiving (for example, step S3101, step S3201, but not limited to this) performed by the network device in any of the above methods, which will not be repeated here. Optionally, the above-mentioned processing module is used to perform at least one of the other steps performed by the network device in any of the above methods, which will not be repeated here.

[0224] In some embodiments, the transceiver module may include a transmitting module and / or a receiving module, and the transmitting module and the receiving module may be separate or integrated. Optionally, the transceiver module may be interchangeable with the transceiver.

[0225] In some embodiments, the processing module can be a single module or can include multiple submodules. Optionally, the multiple submodules respectively execute all or part of the steps required to be executed by the processing module. Optionally, the processing module can be interchangeable with the processor.

[0226] Figure 7A is a schematic diagram of the structure of a communication device 7100 proposed in an embodiment of the present disclosure. Communication device 7100 can be a network device (e.g., an access network device), a terminal (e.g., a user equipment), a chip, a chip system, or a processor that supports a network device in implementing any of the above methods, or a chip, a chip system, or a processor that supports a terminal in implementing any of the above methods. Communication device 7100 can be used to implement the methods described in the above method embodiments. For details, please refer to the description of the above method embodiments.

[0227] As shown in FIG7A , the communication device 7100 includes one or more processors 7101. The processor 7101 may be a general-purpose processor or a dedicated processor, for example, a baseband processor or a central processing unit. The baseband processor may be used to process communication protocols and communication data, and the central processing unit may be used to control a communication device (e.g., 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 communication device 7100 is used to perform any of the above methods.

[0228] In some embodiments, the communication device 7100 further includes one or more memories 7102 for storing instructions. Optionally, all or part of the memories 7102 may be located outside the communication device 7100.

[0229] In some embodiments, the communication device 7100 further includes one or more transceivers 7103. When the communication device 7100 includes one or more transceivers 7103, the transceiver 7103 performs at least one of the communication steps such as sending and / or receiving in the above method (for example, step S3101, step S3103, step S3201, step S3203, but not limited thereto), and the processor 7101 performs at least one of the other steps (for example, step S3102, step S3202, but not limited thereto).

[0230] In some embodiments, a transceiver may include a receiver and / or a transmitter. The receiver and transmitter 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.

[0231] In some embodiments, the communication device 7100 may include one or more interface circuits 7104. Optionally, the interface circuit 7104 is connected to the memory 7102. The interface circuit 7104 may be configured to receive signals from the memory 7102 or other devices, and may be configured to send signals to the memory 7102 or other devices. For example, the interface circuit 7104 may read instructions stored in the memory 7102 and send the instructions to the processor 7101.

[0232] The communication device 7100 described in the above embodiment may be a network device or a terminal, but the scope of the communication device 7100 described in the present disclosure is not limited thereto, and the structure of the communication device 7100 may not be limited by FIG. 7A. 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) others, etc.

[0233] 7B is a schematic diagram of the structure of a chip 7200 proposed in an embodiment of the present disclosure. If the communication device 7100 can be a chip or a chip system, please refer to the schematic diagram of the structure of the chip 7200 shown in FIG7B , but the present disclosure is not limited thereto.

[0234] The chip 7200 includes one or more processors 7201 , and the chip 7200 is configured to execute any of the above methods.

[0235] In some embodiments, the chip 7200 further includes one or more interface circuits 7202. Optionally, the interface circuit 7202 is connected to the memory 7203. The interface circuit 7202 can be used to receive signals from the memory 7203 or other devices, and can be used to send signals to the memory 7203 or other devices. For example, the interface circuit 7202 can read instructions stored in the memory 7203 and send the instructions to the processor 7201.

[0236] In some embodiments, the interface circuit 7202 executes at least one of the communication steps such as sending and / or receiving in the above method (for example, step S3101, step S3103, step S3201, step S3203, but not limited to these), and the processor 7201 executes at least one of the other steps (for example, step S3102, step S3202, but not limited to these).

[0237] In some embodiments, terms such as interface circuit, interface, transceiver pin, and transceiver may be used interchangeably.

[0238] In some embodiments, the chip 7200 further includes one or more memories 7203 for storing instructions. Alternatively, all or part of the memories 7203 may be located outside the chip 7200.

[0239] The present disclosure also proposes a storage medium having instructions stored thereon. When the instructions are executed on the communication device 7100, the communication device 7100 executes any of the above methods. Optionally, the storage medium is an electronic storage medium. Optionally, the storage medium is a computer-readable storage medium, but is not limited thereto and may also be a storage medium readable by other devices. Optionally, the storage medium may be a non-transitory storage medium, but is not limited thereto and may also be a temporary storage medium.

[0240] The present disclosure also provides a program product, which, when executed by the communication device 7100, enables the communication device 7100 to perform any of the above methods. Optionally, the program product is a computer program product.

[0241] The present disclosure also proposes a computer program, which, when executed on a computer, causes the computer to perform any one of the above methods.

Claims

1. A communication method, characterized in that, performed by a terminal, the method comprising: determining a default transmission configuration indication (TCI) state of a first physical downlink shared channel (PDSCH) according to a third frequency offset; wherein, the third frequency offset is a first frequency offset between the first PDSCH and a physical downlink control channel (PDCCH) scheduling the first PDSCH, or the third frequency offset is a second frequency offset between the first PDSCH and a second PDSCH, and the second PDSCH is earlier than the first PDSCH in the time domain; receiving the first PDSCH according to the default TCI state.

2. The method according to claim 1, characterized in that, the method further comprises: obtaining first information, the first information being used to indicate a first threshold value or a plurality of second threshold values; the determining the default TCI state of the first PDSCH according to the third frequency offset comprises: determining the default TCI state of the first PDSCH according to the first information and the third frequency offset.

3. The method according to claim 2, characterized in that, the determining the default TCI state of the first PDSCH according to the first information and the third frequency offset comprises at least one of the following: when the first frequency offset is less than or equal to the first threshold value, determining the TCI state of the PDCCH as the default TCI state of the first PDSCH; when the first frequency offset is less than or equal to the minimum threshold value among the plurality of second threshold values, determining the TCI state of the PDCCH as the default TCI state of the first PDSCH; when the first frequency offset is greater than the smaller threshold value of two second threshold values and less than or equal to the larger threshold value of the two second threshold values, determining the TCI state corresponding to the code point obtained by offsetting the code point corresponding to the TCI state of the PDCCH by a first number of code points as the default TCI state of the first PDSCH, and the first number is related to at least one of the two second threshold values.

4. The method according to claim 2 or 3, characterized in that, the method further comprises: when the first frequency offset is greater than the first threshold value, ignoring the received signal of a transceiver unit (TXRU) or an antenna panel.

5. The method according to claim 2, characterized in that, the determining the default TCI state of the first PDSCH according to the first information and the third frequency offset comprises: determining the TCI state of the second PDSCH that meets a first condition as the default TCI state of the first PDSCH, and the first condition comprises one of the following: the second frequency offset is less than or equal to the first threshold value; the second frequency offset is less than or equal to the minimum threshold value among the plurality of second threshold values.

6. The method according to claim 5, characterized in that, the first condition further comprises at least one of the following: among the PDSCHs received by the terminal, the second PDSCH is the closest to the first PDSCH in the time domain; the second PDSCH is correctly received.

7. A communication method, characterized in that, performed by a network device, the method comprising: sending a first PDSCH; the first PDSCH is used for a terminal to receive according to a default TCI state of the first PDSCH, the default TCI state of the first PDSCH is determined by the terminal according to a third frequency offset, the third frequency offset is a first frequency offset between the first PDSCH and a PDCCH scheduling the first PDSCH, or the third frequency offset is a second frequency offset between the first PDSCH and a second PDSCH, and the second PDSCH is earlier than the first PDSCH in the time domain.

8. The method according to claim 7, characterized in that, the method further comprises: sending a first piece of information, the first piece of information is used to indicate a first threshold value or a plurality of second threshold values, and the first piece of information is used for the terminal to determine the default TCI state of the first PDSCH.

9. The method according to claim 8, characterized in that, the first piece of information is used for the terminal to determine the default TCI state of the first PDSCH by at least one of the following: when the first frequency offset is less than or equal to the first threshold value, determining that the TCI state of the PDCCH is the default TCI state of the first PDSCH; when the first frequency offset is less than or equal to the minimum threshold value among the plurality of second threshold values, determining that the TCI state of the PDCCH is the default TCI state of the first PDSCH; when the first frequency offset is greater than the smaller threshold value of two second threshold values and less than or equal to the larger threshold value of the two second threshold values, determining that the TCI state corresponding to the code point obtained by offsetting the code point corresponding to the TCI state of the PDCCH by a first number of code points is the default TCI state of the first PDSCH, and the first number is related to at least one of the two second threshold values.

10. The method according to claim 8 or 9, characterized in that, the first piece of information is used for the terminal to ignore the received signal of the TXRU or the antenna panel when the first frequency offset is greater than the first threshold value.

11. The method according to claim 8, characterized in that, the first piece of information is used for the terminal to determine that the TCI state of the second PDSCH satisfying a first condition is the default TCI state of the first PDSCH, and the first condition includes one of the following: the second frequency offset is less than or equal to the first threshold value; the second frequency offset is less than or equal to the minimum threshold value among the plurality of second threshold values.

12. The method according to claim 11, characterized in that, the first condition further includes at least one of the following: among the PDSCHs received by the terminal, the second PDSCH is the closest to the first PDSCH in the time domain; the second PDSCH is correctly received.

13. A terminal, characterized in that, comprising: A processing module, configured to determine a default TCI state of a first PDSCH according to a third frequency offset; wherein, the third frequency offset is a first frequency offset between the first PDSCH and a PDCCH scheduling the first PDSCH, or the third frequency offset is a second frequency offset between the first PDSCH and a second PDSCH, and the second PDSCH is earlier than the first PDSCH in the time domain; A transceiver module, configured to receive the first PDSCH according to the default TCI state.

14. A network device, characterized in that, it includes: A transceiver module, configured to transmit a first PDSCH; the first PDSCH is used for a terminal to receive according to a default TCI state of the first PDSCH, and the default TCI state of the first PDSCH is determined by the terminal according to a third frequency offset, where the third frequency offset is a first frequency offset between the first PDSCH and a PDCCH scheduling the first PDSCH, or the third frequency offset is a second frequency offset between the first PDSCH and a second PDSCH, and the second PDSCH is earlier than the first PDSCH in the time domain.

15. A terminal, characterized in that, it includes: One or more processors; wherein, the terminal is configured to execute the communication method according to any one of claims 1-6.

16. A network device, characterized in that, it includes: One or more processors; wherein, the network device is configured to execute the communication method according to any one of claims 7-12.

17. A communication system, characterized in that, it includes a terminal and a network device, wherein the terminal is configured to implement the communication method according to any one of claims 1-6, and the network device is configured to implement the communication method according to any one of claims 7-12.

18. A storage medium, the storage medium stores instructions, characterized in that, when the instructions run on a communication device, the communication device is caused to execute the communication method according to any one of claims 1-6 or any one of claims 7-12.

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