Method, apparatus and communication device for determining transmission mode

Abstract

The present application provides a method, an apparatus, and a communication device for determining a transmission mode in the field of communication, the method including determining a single frequency network transmission mode by a target indication manner, where the target indication manner includes one of an RRC signaling indication manner, a TCI state indication manner, a manner in which configured or indicated target parameters satisfy predetermined parameter requirements, and an indication manner in which a PDCCH adopts an SFN transmission mode.

Description

[Technical Field]

[0001] (CROSS-REFERENCE TO RELATED APPLICATIONS) This invention claims priority to a Chinese patent application entitled "Method, Apparatus and Communication Device for Determining Transmission Mode," filed with the China Patent Office on September 29, 2020, bearing application number 202011051668.0, the entire contents of which are incorporated herein by reference.

[0002] FIELD OF THE INVENTION Embodiments of the present invention relate to the field of communications, and more particularly to a method, apparatus and communication device for determining a transmission mode. [Background technology]

[0003] In some cases, Radio Resource Control (RRC) upper layer and physical layer configurations may indicate and distinguish between various Multiple Transmission and Reception Point (MTRP) transmission modes, such as spatial division multiplex (SDM), frequency division multiplex (FDM), time division multiplex (TDM), etc.

[0004] However, currently, it is not possible to indicate the MTRP transmission mode of a single frequency network (SFN), which is disadvantageous for the network and terminals to perform corresponding processing operations. Summary of the Invention [Problem to be solved by the invention]

[0005] The embodiments of the present application provide a method, an apparatus and a communication device for determining a transmission mode, which can determine the MTRP transmission mode of a single frequency network type. [Means for solving the problem]

[0006] According to a first aspect, there is provided a method for determining a transmission mode to be implemented by a communication device, the method including: determining a single frequency network (SFN) transmission mode through a target indication manner, where the target indication manner includes one of a radio resource control (RRC) signaling indication manner, a target transmission configuration indication state (TCI) state indication manner, a manner in which configured or indicated target parameters satisfy predetermined parameter requirements, and an indication manner in which a physical downlink control channel (PDCCH) adopts the SFN transmission mode.

[0007] According to a second aspect, there is provided an apparatus for determining a transmission mode, the apparatus comprising: a determining module for determining a single frequency network (SFN) transmission mode through a target indication manner, where the target indication manner includes one of a radio resource control (RRC) signaling indication manner, a target transmission configuration indication state (TCI) state indication manner, a manner in which configured or indicated target parameters satisfy predetermined parameter requirements, and an indication manner in which a physical downlink control channel (PDCCH) adopts the SFN transmission mode.

[0008] According to a third aspect, there is provided a terminal device, the terminal device including a processor, a memory, and a program or instructions stored in the memory and operable to run on the processor, the program or instructions being operable when executed by the processor to implement the steps of the method of the first aspect.

[0009] According to a fourth aspect, there is provided a network device comprising a processor, a memory, and a program or instructions stored in the memory and operable to run on the processor, the program or instructions, when executed by the processor, implementing the steps of the method of the first aspect.

[0010] According to a fifth aspect, there is provided a readable storage medium having stored thereon a program or instructions which, when executed by a processor, implements the steps of the method according to the first aspect.

[0011] According to a sixth aspect, there is provided a computer program product comprising a processor, a memory, and a program or instructions stored in the memory and operable to run on the processor, the program or instructions being operable when executed by the processor to implement the steps of the method of the first aspect.

[0012] According to a seventh aspect, there is provided a chip, the chip including a processor and a communication interface, the communication interface coupled to the processor, the processor running a program or instructions and adapted to implement the method of the first aspect. [Effects of the Invention]

[0013] The embodiments of the present application provide a method, an apparatus and a communication device for determining a transmission mode, which determine a single-frequency network transmission mode by a target indication method, where the target indication method includes one of an RRC signaling indication method, a TCI state indication method, a method in which configured or indicated target parameters meet predetermined parameter requirements, and an indication method in which PDCCH adopts SFN transmission mode, and can determine a single-frequency network type MTRP transmission mode. [Brief explanation of the drawings]

[0014] The drawings described herein are used to provide further understanding of the present application, constitute a part of the present application, and the illustrative embodiments and the description thereof are used to interpret the present application and are not to be construed as unduly limiting the present application. [Figure 1] 1 shows a block diagram of a wireless communication system to which an embodiment of the present application can be applied. [Figure 2] 3 is a schematic flowchart of a method for determining a transmission mode according to one embodiment of the present invention; [Figure 3] 3 is a schematic flowchart of a method for determining a transmission mode according to one embodiment of the present invention; [Figure 4] 3 is a schematic flowchart of a method for determining a transmission mode according to one embodiment of the present invention; [Figure 5] 3 is a schematic flowchart of a method for determining a transmission mode according to one embodiment of the present invention; [Figure 6a] 3 is a schematic flowchart of a method for determining a transmission mode according to one embodiment of the present invention; [Figure 6b] FIG. 1 is a schematic diagram of merging duplicate references. [Figure 7] 3 is a schematic flowchart of a method for determining a transmission mode according to one embodiment of the present invention; [Figure 8] 3 is a schematic flowchart of a method for determining a transmission mode according to one embodiment of the present invention; [Figure 9a] 3 is a schematic flowchart of a method for determining a transmission mode according to one embodiment of the present invention; [Figure 9b] FIG. 1 is a schematic diagram of offset pre-correction in SFN transmission mode. [Figure 10] 3 is a schematic flowchart of a method for determining a transmission mode according to one embodiment of the present invention; [Figure 11] 3 is a schematic flowchart of a method for determining a transmission mode according to one embodiment of the present invention; [Figure 12] 1 is a structural schematic diagram of an apparatus for determining a transmission mode according to one embodiment of the present invention; [Figure 13] FIG. 2 is a structural schematic diagram of a communication device according to another embodiment of the present invention; [Figure 14] FIG. 2 is a structural schematic diagram of a network device according to another embodiment of the present invention; [Figure 15] FIG. 2 is a structural schematic diagram of a terminal device according to another embodiment of the present invention; DETAILED DESCRIPTION OF THE INVENTION

[0015] The following clearly and completely describes the technical solutions in the embodiments of the present application, in conjunction with the drawings in the embodiments of the present application, and it is obvious that the described embodiments are only some of the embodiments of the present application, and not all of the embodiments. All other embodiments obtained by those skilled in the art based on the embodiments of the present application without any creative efforts fall within the scope of protection of the present application.

[0016] The terms "first," "second," etc. in the specification and claims of this application are intended to distinguish between similar objects and are not intended to describe a particular order or sequence. It should be understood that such terms, when used, are interchangeable where appropriate, so that embodiments of this application may be performed in orders other than those illustrated or described herein. Note that "and / or" in the specification and claims indicates at least one of the connected objects, and the character " / " generally indicates an "or" relationship between the related objects.

[0017] It should be noted that the techniques described in the embodiments of the present application are not limited to Long Term Evolution (LTE) / LTE-Advanced (LTE-A) systems, but can also be applied to other wireless communication systems, such as Code Division Multiple Access (CDMA), Time Division Multiple Access (TDMA), Frequency Division Multiple Access (FDMA), Orthogonal Frequency Division Multiple Access (OFDMA), Single-carrier Frequency-Division Multiple Access (SC-FDMA), and other systems. The terms "system" and "network" in the embodiments of the present application are always used interchangeably, and the described techniques may be used in the above-mentioned systems and radio technologies as well as other systems and radio technologies. However, although the following description describes New Radio (NR) systems for illustrative purposes and uses NR terminology in most of the following description, these technologies may also be used in applications other than NR system applications, such as sixth generation (6G) systems. th This may be applied to 6G (6th Generation) communication systems.

[0018] 1 shows a block diagram of a wireless communication system to which the embodiments of the present application can be applied. The wireless communication system includes a terminal 11 and a network side device 12. Here, the terminal 11 may be referred to as a terminal device or user equipment (UE), and may be a terminal side device such as a mobile phone, a tablet personal computer (PDA), a laptop computer (also called a notebook computer), a personal digital assistant (PDA), a palmtop computer, a netbook, an ultra-mobile personal computer (UMPC), a mobile internet device (MID), a wearable device, a vehicle-mounted equipment (VUE), a pedestrian-mounted equipment (PUE), etc., and wearable devices include a bracelet, an earphone, glasses, etc. It should be noted that the specific type of the terminal 11 in the embodiments of the present application is not limited.The network side device 12 may be a base station or a core network, where the base station may be called a Node B, an evolved Node B, an access point, a base transceiver station (BTS), a radio base station, a radio transceiver, a basic service set (BSS), an extended service set (ESS), a B node, an evolved B node (eNB), a home B node, a home evolved B node, a WLAN access point, a WiFi node, a transmitting and receiving point (TRP), a macro base station, a pico base station, a relay station, a remote radio unit (RRU), a remote radio head (RRH), etc., or any other appropriate term in the art. As long as the same technical effect is achieved, the base station is not limited to a specific technical term. For illustrative purposes, the embodiments of this application only take base stations in an NR system as examples, and do not limit the specific type of base station.

[0019] The following describes in detail the method for determining a transmission mode according to the embodiments of the present application in accordance with specific embodiments and application scenarios thereof, in conjunction with the drawings.

[0020] As shown in FIG. 2, one embodiment of the present invention provides a method 200 for determining a transmission mode, which may be performed by a terminal device and / or a network device, in other words, the method may be performed by software or hardware installed in the terminal device and / or the network device, and the method includes the following steps:

[0021] S202: Determine a single frequency network transmission mode according to a target indication method.

[0022] The SFN transmission mode includes that in the deployment of SFN, multiple RRHs are connected to one BBU, so that the terminal does not need to frequently switch base stations during high-speed movement. Based on this, it is necessary to distinguish whether to adopt the SFN transmission mode. This step determines whether to adopt the single frequency network SFN transmission mode according to the following target indication method:

[0023] The target indication method includes one of a radio resource control (RRC) signaling indication method, a target transmission configuration indication state (TCI) state indication method, a method in which the configured or indicated target parameters satisfy a predetermined parameter requirement, and an indication method in which the physical downlink control channel (PDCCH) adopts the SFN transmission mode.

[0024] In the method for determining a transmission mode according to an embodiment of the present invention, the execution body may be a terminal device or a network device, and determining a single frequency network (SFN) transmission mode according to the above-mentioned target indication manner includes the following implementation manner:

[0025] If the execution entity is a network device, the network device instructs the UE of the SFN transmission mode according to the target indication method, and if the execution entity is a UE, the UE determines the SFN transmission mode according to the target indication method, thereby determining the MTRP transmission mode of the SFN format, and the network device and the terminal device can transmit or receive data according to the SFN transmission mode, and can ensure that the network and the terminal correctly understand whether to implement the SFN mode. If the terminal correctly understands that the network adopts the SFN transmission mode to transmit a physical downlink shared channel (PDSCH) or a physical downlink control channel (PDCCH), the terminal performs corresponding channel monitoring.

[0026] As shown in FIG. 3, one embodiment of the present invention provides a method 300 for determining a transmission mode, which may be performed by a terminal device and / or a network device, in other words, the method may be performed by software or hardware installed in the terminal device and / or the network device, and the method includes the following steps:

[0027] S302: If the target indication method is an RRC signaling indication method, SFN indication information for indicating the SFN transmission mode is arranged in the RRC signaling, and whether to adopt the SFN transmission mode is determined according to the SFN indication information.

[0028] In the method for determining a transmission mode according to an embodiment of the present invention, the execution body may be a terminal device or a network device. When this step is performed by a network device, the network device configures the RRC signaling, configures SFN indication information in the RRC signaling to indicate the SFN transmission mode, sends the RRC signaling to the UE, and determines whether to adopt the SFN transmission mode according to the SFN indication information.

[0029] When this step is performed by a UE, the UE receives RRC signaling, in which SFN indication information for indicating the SFN transmission mode is configured, and the UE determines whether the network adopts the SFN transmission mode to transmit PDSCH or PDCCH according to the SFN indication information.

[0030] S304: Enable the SFN transmission mode through first signaling.

[0031] Here, the first signaling is indicated by a Medium Access Control Element (MAC CE) or Downlink Control Information (DCI), for example, the SFN transmission mode may be enabled by a target field in the MAC CE or DCI.

[0032] For example, in step S302, the SFN transmission mode may be determined according to the format of the RRC signaling, and an "sfn" field indicating the SFN transmission mode may be added to the RRC RepetitionSchemeConfig information element, where the RRC signaling may be configured to select one from fdm-TDM, slotBased, and sfn, and the configuration format of the sfn field may be ENUMERATED or SetupRelease. If the network configures the "sfn" field in the RRC message, SFN transmission is enabled.

[0033] In one implementation, SFN transmission is enabled if the network places an "sfn" field in the RRC message in step S304 and activates it by a specific field for SFN transmission in MAC CE, or if the network places an "sfn" field in the RRC message in step S304 and implicitly indicates it by other already defined related MAC CE signaling, such as MAC CE signaling for activating or indicating TCI state.

[0034] In another implementation, in step S304, SFN transmission is enabled if the network places an "sfn" field in the RRC message and indicates it by a specific DCI field for SFN transmission.

[0035] In another implementation, in step S304, SFN transmission is enabled if the network places an “sfn” field in the RRC message and implicitly indicates it by other already defined related DCI signaling, for example, DCI signaling for indicating the TCI state.

[0036] In the method for determining a transmission mode according to an embodiment of the present invention, when the target indication method is an RRC signaling indication method, SFN indication information for indicating the SFN transmission mode is disposed in the RRC signaling, and the SFN indication information is used to determine whether to adopt the SFN transmission mode, thereby determining an MTRP transmission mode of SFN type. Thus, the network device and the terminal device can transmit or receive data based on the SFN transmission mode, and can ensure that the network and terminal parties correctly understand whether to implement the SFN mode.

[0037] As shown in FIG. 4, one embodiment of the present invention provides a method 400 for determining a transmission mode, which may be performed by a terminal device and / or a network device, in other words, the method may be performed by software or hardware installed in the terminal device and / or the network device, and the method includes the following steps:

[0038] S402: Determine the SFN transmission mode according to the first target TCI state indication manner.

[0039] The target indication method is a target transmission configuration indication (TDMA). a TCI (Tuning Indicator) state indication scheme, and the target TCI state is a first target TCI state, and the first target TCI state is associated with a first target Quasi Co-location-type (QCL-type), where the first target QCL-type is: a first QCL-Type whose included element is delay spread; a second QCL-Type whose elements are mean delay and delay spread; A third QCL-Type whose elements are Doppler spread, mean delay and delay spread; The included elements include at least one QCL-type of Doppler offset, Doppler spread, and a fourth QCL-type that is delay spread.

[0040] Quasi co-location (QCL) means that the average delay, delay spread, Doppler offset, Doppler spread, and spatial reception parameters of the channel experienced by a symbol on a certain antenna port can also be estimated by a single antenna port. New Radio (NR) has four different types of QCL relationships to accommodate different transmission scenarios.

[0041] 1) QCL-TypeA, {Doppler offset, Doppler spread, average delay, delay spread}.

[0042] 2) QCL-TypeB, {Doppler offset, Doppler spread}.

[0043] 3) QCL-TypeC, {Doppler offset, average delay}.

[0044] 4) QCL-TypeD, {spatial receiving parameters}.

[0045] Typically, a tracking reference signal (TRS) is configured in the DMRS as being used for QCL reference in the form of QCL-Type A. The TCI is used to indicate the QCL reference relationship between the reference signals. In an MTRP scenario, two TCI states are typically indicated simultaneously. A maximum of two QCL reference sources are included in one TCI state, and the QCL-Types corresponding to the two QCL reference sources in one TCI state cannot be the same. If two QCL reference sources are associated with one TCI state, the QCL-Type of one of the QCL reference sources must be QCL-Type D.

[0046] The following describes TCI state allocation using an example, in which one TCI state is indicated for the DMRS of the PDSCH by the DCI, and this TCI state is associated with two QCL reference sources, one TRS resource and one CSI-RS for BM resource, respectively. Here, the TRS resource corresponds to QCL-Type A, and the CSI-RS for BM resource corresponds to QCL-Type D.

[0047] However, this step may also be understood as determining the SFN transmission mode based on the first target TCI state when the first target QCL-type is newly defined in addition to the above four QCL types and the first target TCI state is associated with the first target QCL-type.

[0048] In one implementation, the first target TCI state may be configured or indicated by RRC, MAC CE, or DCI, and if this step is performed by a network device, the network device may configure or indicate the first target TCI state by RRC, MAC CE, or DCI, and indicate the SFN transmission mode by the first target TCI state. Correspondingly, if this step is performed by a UE, the UE receives the first target TCI state configured or indicated by the network device by RRC, MAC CE, or DCI, and determines whether the network adopts the SFN transmission mode to transmit the PDSCH or PDCCH.

[0049] In one implementation, when a first preset condition is met, this step is executed, i.e., when a first preset condition is met, the SFN transmission mode is determined according to the first target TCI state, where the first preset condition is: For a PDSCH or a PDCCH, a TCI state associated with the first target QCL-type exists in the TCI state configured by RRC; For a PDSCH, a TCI state associated with the first target QCL-type exists in the TCI states activated by the MAC CE; and For a PDCCH, a TCI state associated with the first target QCL-type exists in the TCI state indicated by the MAC CE; For PDSCH, the TCI state indicated by DCI includes a TCI state associated with the first target QCL-type.

[0050] For example, various possible first target QCL-types that can be newly defined are as follows:

[0051] QCL-TypeE1, whose included element is {Delay Spread}.

[0052] QCL-TypeE2, whose included elements are {average delay, delay spread}.

[0053] QCL-TypeE3, whose included elements are {Doppler spread, mean delay, delay spread}.

[0054] QCL-TypeE4, whose included elements are {Doppler offset, Doppler spread, delay spread}.

[0055] In one implementation, the DMRS of the PDSCH or PDCCH may refer to the TRS in the manner of QCL-Type E1 / E2 / E3.

[0056] In one implementation, the TRS may refer to the TRS in the manner of QCL-Type E1 / E2 / E3.

[0057] In one implementation, a CSI Reference Signal (CSI-RS) may refer to the TRS in the QCL-Type E1 / E2 / E3 format.

[0058] In one implementation, the DMRS of the PDSCH / PDCCH may refer to the TRS in the QCL-Type E4 scheme.

[0059] In one implementation, the CSI-RS may refer to the TRS in the manner of QCL-TypeE4.

[0060] For example, in case 1, RRC configures eight TCI states for PDCCH or PDSCH, which are TCI state 1, TCI state 2, ..., TCI state 8, respectively. Here, if TCI state 2 is associated with one QCL reference source, which is TRS resource 2, and the QCL-Type is QCL-TypeE3, the SFN transmission mode is enabled.

[0061] In case 2, RRC configures 10 TCI states for PDSCH, which are TCI state 1, TCI state 2, ..., TCI state 10, respectively. Here, TCI state 2 is associated with one QCL source, which is TRS resource 2, and the QCL-Type is QCL-TypeE3. From these 10 TCI states, the MAC CE activates TCI state 1 to TCI state 8. Since TCI state 2 is present in the eight TCI states activated by the MAC CE, the SFN transmission mode is enabled.

[0062] In case 3, RRC configures 10 TCI states for the PDCCH, which are TCI state 1, TCI state 2, ..., TCI state 10, respectively. Here, TCI state 2 is associated with one QCL source, which is TRS resource 2, and the QCL-Type is QCL-TypeE3. If the MAC CE indicates TCI state 2 from these 10 TCI states as the QCL reference for the PDCCH DMRS, the SFN transmission mode is enabled.

[0063] In case 4, RRC configures 10 TCI states for the PDSCH, which are TCI state 1, TCI state 2, ..., TCI state 10, respectively. Here, TCI state 2 is associated with one QCL source, which is TRS resource 2, and the QCL-Type is QCL-TypeE3. If the MAC CE activates TCI state 1 to TCI state 8 from these 10 TCI states, and the DCI finally indicates TCI state 2 from the eight TCI states activated by the MAC CE as the QCL reference for the PDSCH DMRS, the SFN transmission mode is enabled.

[0064] In the above cases 1 to 4, the newly defined TCI state is only QCL-TypeE3 as an example, and QCL-TypeE3 can be replaced with any other newly defined TCI state.

[0065] In the method for determining a transmission mode according to an embodiment of the present invention, when the target indication manner is a target TCI state indication manner and the target TCI state is a first target TCI state, the first target TCI state is associated with the first target quasi-collocation type QCL-type, and the newly defined QCL-type can indicate an MTRP transmission mode of SFN type, thereby allowing the network device and the terminal device to transmit or receive data based on the SFN transmission mode and ensuring that the network and terminal devices correctly understand whether the other party implements the SFN mode.

[0066] As shown in FIG. 5, one embodiment of the present invention provides a method 500 for determining a transmission mode, which may be performed by a terminal device and / or a network device, in other words, the method may be performed by software or hardware installed in the terminal device and / or the network device, and the method includes the following steps:

[0067] S502: Determine the SFN transmission mode according to the second target TCI state.

[0068] Here, the target indication method is a target TCI state indication method, and the target TCI state is a second target TCI state, and the second target TCI state is related to a target association relationship between an uplink signal and a downlink signal, and an element included in the target association relationship between the uplink signal and the downlink signal includes a Doppler offset, for example, a Doppler offset.

[0069] In one implementation, the second target TCI state may be configured or indicated by RRC, MAC CE, or DCI, and if this step is performed by a network device, the network device may configure or indicate the second target TCI state by RRC, MAC CE, or DCI, and indicate the SFN transmission mode by the second target TCI state. Accordingly, if this step is performed by a UE, the UE determines whether the network adopts the SFN transmission mode to transmit the PDSCH or PDCCH by receiving the second target TCI state configured or indicated by the network device by RRC, MAC CE, or DCI.

[0070] In one implementation, this step is performed when a second preset condition is met, i.e., when the second preset condition is met, the SFN transmission mode is determined according to the second target TCI state.

[0071] Here, the second preset condition is: For a PDSCH or a PDCCH, a TCI state configured by RRC exists that is related to the target association relationship between the uplink signal and the downlink signal; For a PDSCH, a TCI state associated with a target association relationship between the uplink signal and the downlink signal exists in the TCI state activated by the MAC CE; For a PDCCH, a TCI state indicated by a MAC CE exists that is related to the target association relationship between the uplink signal and the downlink signal; For PDSCH, the TCI state indicated by DCI includes at least one of: a TCI state associated with the target association relationship between the uplink signal and the downlink signal.

[0072] For example, the association relationship is {Doppler offset}. When the association relationship between the uplink signal and the downlink signal is available, it includes, but is not limited to, that the uplink Sounding Reference Signal (SRS) is associated with the Doppler offset of the downlink TRS, that the DMRS of the PUSCH or PUCCH is associated with the Doppler offset of the downlink TRS, etc.

[0073] As shown in FIG. 6a, one embodiment of the present invention provides a method 600 for determining a transmission mode, which may be performed by a terminal device and / or a network device, in other words, the method may be performed by software or hardware installed in the terminal device and / or the network device, and the method includes the following steps:

[0074] S602: Determine the SFN transmission mode according to the third target TCI state.

[0075] Wherein, the target indication manner is a target TCI state indication manner, the target TCI state is a third target TCI state, the plurality of downlink reference signal resources associated with the third target TCI state include at least two target downlink reference signal resources, and the QCL-Type corresponding to the target downlink reference signal resources is not QCL-Type D. This step may be understood as defining a new TCI state, that is, the third target TCI state is used to determine the SFN transmission mode.

[0076] In one implementation, the third target TCI state may be configured or indicated by RRC, MAC CE, or DCI, and if this step is performed by a network device, the network device may configure or indicate the third target TCI state by RRC, MAC CE, or DCI, and indicate the SFN transmission mode by the third target TCI state. Accordingly, if this step is performed by a UE, the UE determines whether the network adopts the SFN transmission mode to transmit the PDSCH or PDCCH by receiving the third target TCI state configured or indicated by the network device by RRC, MAC CE, or DCI.

[0077] In one implementation, this step is performed when a third preset condition is met, i.e., when the third preset condition is met, the SFN transmission mode is determined according to a third target TCI state.

[0078] Here, the third preset condition is: The third target TCI state exists in the TCI state configured by RRC for the PDSCH or the PDCCH; the third target TCI state exists in the TCI states activated by the MAC CE for the PDSCH; For a PDCCH, the third target TCI state exists in the TCI state indicated by the MAC CE; and for a PDSCH, the third target TCI state exists in a TCI state indicated by a DCI.

[0079] In one implementation, when the QCL-Types corresponding to the target downlink reference signal resources are the same, one of the downlink reference signal resources corresponding to the same QCL-Type is an anchor point, and the anchor point is preset according to a predetermined rule or instructed by a network. The QCL-Types corresponding to the target downlink reference signal resources may be different. Here, presetting according to a predetermined rule may mean, for example, setting a higher-order reference signal resource of a predetermined TCI state as the anchor point.

[0080] In one implementation, after determining the single frequency network SFN transmission mode through the target indication manner, the method may further include concatenating and referencing overlapping elements of the at least two target downlink reference signal resource QCL-Types.

[0081] An example is given to explain that the new TCI state format is as follows:

[0082] 1) Four TRS resources are associated with the TCI state: TRS resource 1 corresponding to QCL-TypeA, TRS resource 2 corresponding to QCL-TypeA, CSI-RS resource 3 corresponding to QCL-TypeD, and CSI-RS resource 4 corresponding to QCL-TypeD.

[0083] 2) Four TRS resources are associated with the TCI state: TRS resource 1 corresponding to QCL-TypeA, TRS resource 2 corresponding to QCL-TypeE1, CSI-RS resource 3 corresponding to QCL-TypeD, and CSI-RS resource 4 corresponding to QCL-TypeD.

[0084] In the above 2), only QCL-Type E1 is given as an example, but QCL-Type E1 can be replaced with any other newly defined QCL-Type, such as one or more of the newly defined QCL-Types E1 to E4 described in the example of FIG.

[0085] In case 1), there are two TRS resources that both correspond to QCL-TypeA, so one of the TRS resources needs to be set as an anchor point to provide the complete QCL-TypeA reference, while the TRS resource that is not the anchor point is only used to provide some QCL reference items such as {delay spread} or {average delay, delay spread} or {Doppler spread, average delay, delay spread}, or {Doppler offset, Doppler spread, delay spread} in QCL-TypeA.

[0086] For example, it may include the following: if the MAC CE or DCI indicates TRS resource 1 as the anchor point, TRS resource 1 provides the complete QCL-TypeA reference item {Doppler offset, Doppler spread, mean delay, delay spread}, while TRS resource 2 provides only {delay spread}, or {mean delay, delay spread}, or {Doppler spread, mean delay, delay spread}, or {Doppler offset, Doppler spread, delay spread}, and CSI-RS resource 3 and CSI-RS resource 4 provide the corresponding {spatial parameters}, respectively.

[0087] For example, the TRS resource corresponding to the QCL-Type parameter with the highest sequence number may be silently determined to be the anchor point according to the order of sequence numbers of the upper layer QCL-Type parameters. For example, if the upper layer parameter qcl-Type1 corresponds to TRS resource 1, the upper layer parameter qcl-Type2 corresponds to CSI-RS resource 3, the upper layer parameter qcl-Type3 corresponds to TRS resource 2, and the upper layer parameter qcl-Type4 corresponds to CSI-RS resource 4, TRS resource 1 provides the complete QCL-TypeA reference items {Doppler offset, Doppler spread, mean delay, delay spread} as the anchor point, while TRS resource 2 provides only {delay spread}, {mean delay, delay spread}, {Doppler spread, mean delay, delay spread}, or {Doppler offset, Doppler spread, delay spread}, and CSI-RS resource 3 and CSI-RS resource 4 provide the corresponding {spatial parameters}, respectively.

[0088] In addition, in both cases 1) and 2), if multiple reference signals whose reference type is not QCL-Type D provide overlapping QCL reference items, the terminal must integrate both of them during processing. Taking case 2) as an example below, QCL-Type A corresponds to TRS resource 1, and TRS resource 2 corresponds to QCL-Type E1, so the overlapping QCL reference item in both is {delay spread}. Therefore, during processing, the terminal must integrate the delay spread provided by TRS resource 1 and the delay spread provided by TRS resource 2 to calculate a single combined delay spread, as shown in Figure 6b below. Type integration processing is also performed in other cases. For example, if both TRS resource 1 and TRS resource 2 provide Doppler spread, the terminal must similarly combine both pieces of information to calculate a single combined Doppler spread.

[0089] The step of determining the SFN transmission mode according to the third target TCI state will be described using an example. For example, in case 1, RRC configures eight TCI states for the PDCCH or PDSCH, which are TCI state 1, TCI state 2, ..., TCI state 8, respectively. Here, when four QCL reference sources, which are TRS resource 1 corresponding to QCL-Type A, TRS resource 2 corresponding to QCL-Type A, CSI-RS resource 3 corresponding to QCL-Type D, and CSI-RS resource 4 corresponding to QCL-Type D, respectively, are associated with TCI state 1, the SFN transmission mode is enabled.

[0090] In Case 2, RRC configures 10 TCI states for the PDSCH, namely, TCI state 1, TCI state 2, ..., TCI state 10. Here, TCI state 1 is associated with four QCL reference sources, namely, TRS resource 1 corresponding to QCL-TypeA, TRS resource 2 corresponding to QCL-TypeA, CSI-RS resource 3 corresponding to QCL-TypeD, and CSI-RS resource 4 corresponding to QCL-TypeD. The MAC CE activates TCI state 1 to TCI state 8 from these 10 TCI states. Since TCI state 1 exists among the eight TCI states activated by the MAC CE, the SFN transmission mode is enabled.

[0091] In Case 3, RRC configures 10 TCI states for the PDCCH, namely, TCI state 1, TCI state 2, ..., TCI state 10. Here, TCI state 1 is associated with four QCL reference sources, namely, TRS resource 1 corresponding to QCL-TypeA, TRS resource 2 corresponding to QCL-TypeA, CSI-RS resource 3 corresponding to QCL-TypeD, and CSI-RS resource 4 corresponding to QCL-TypeD. When the MAC CE indicates TCI state 1 from these 10 TCI states as the QCL reference for the PDCCH DMRS, the SFN transmission mode is enabled.

[0092] In Case 4, RRC configures 10 TCI states for the PDSCH, namely, TCI state 1, TCI state 2, ..., TCI state 10. Here, TCI state 1 is associated with four QCL reference sources, namely, TRS resource 1 corresponding to QCL-TypeA, TRS resource 2 corresponding to QCL-TypeA, CSI-RS resource 3 corresponding to QCL-TypeD, and CSI-RS resource 4 corresponding to QCL-TypeD. If the MAC CE activates TCI state 1 to TCI state 8 from these 10 TCI states and the DCI finally indicates TCI state 1 from the eight TCI states activated by the MAC CE as the QCL reference for the PDSCH DMRS, the SFN transmission mode is enabled.

[0093] The method for determining a transmission mode according to an embodiment of the present invention may define a new TCI state format for determining an SFN transmission mode.

[0094] As shown in FIG. 7, one embodiment of the present invention provides a method 700 for determining a transmission mode, which may be performed by a terminal device and / or a network device, in other words, the method may be performed by software or hardware installed in the terminal device and / or the network device, and the method includes the following steps:

[0095] S702: If the target indication method is a method in which the configured or indicated target parameters satisfy a predetermined parameter requirement, the predetermined parameter requirement is that the target Code Division Multiplex (CDM) group number of the PDSCH Demodulation Reference Signal (DMRS) port indicated by the DCI is a predetermined group number, the corresponding TCI State number is a predetermined type, and there is no predetermined enabled parameter configuration in the RRC configuration parameters.

[0096] For example, in one implementation, if the DCI indicates that the CDM group number of a PDSCH DMRS port(s) is 1 and the corresponding TCI State number is 2, and there is no higher layer parameter configuration RepSchemeEnabler, then the SFN transmission mode is enabled.

[0097] As shown in FIG. 8, one embodiment of the present invention provides a method 800 for determining a transmission mode, which may be performed by a terminal device and / or a network device, in other words, the method may be performed by software or hardware installed in the terminal device and / or the network device, and the method includes the following steps:

[0098] S802: If the target indication method is an indication method for the PDCCH to adopt the SFN transmission mode, when the PDCCH is transmitted using the SFN transmission mode, implicitly indicate that the PDSCH adopts the SFN transmission mode.

[0099] When this step is performed by a network device, the network device implicitly instructs the UE that the PDSCH is also transmitted in the SFN format by adopting the SFN transmission mode to transmit the PDCCH. Accordingly, when this step is performed by a UE, if the PDCCH received by the UE is transmitted in the SFN transmission mode, the UE desires that the PDSCH be transmitted in the SFN format as well.

[0100] As shown in FIG. 9a, one embodiment of the present invention provides a method 900 for determining a transmission mode, which may be performed by a terminal device and / or a network device, in other words, the method may be performed by software or hardware installed in the terminal device and / or the network device, and the method includes the following steps:

[0101] S902: When adopting the SFN transmission mode, determine whether to use the offset pre-compensation function in the target case.

[0102] Figure 9b shows a schematic diagram of offset pre-compensation in SFN transmission mode. In an SFN network, multiple remote radio heads (RRHs) are connected to a single base station (BBU). Thus, a terminal moving at high speed does not need to frequently switch base stations. However, multiple remote radio heads transmit the same data to the terminal. Because the terminal and the remote radio heads are located at different positions, the delay, power, and Doppler shift of the signals transmitted by the multiple remote radio heads arriving at the terminal are different. In particular, the difference in Doppler shift significantly impacts the terminal's data demodulation performance. For example, in a high-speed train scenario, if a terminal moves between two remote radio heads, the Doppler offset experienced by the terminal from left remote radio head 1 is Δf1, and the Doppler offset experienced by the terminal from right remote radio head 2 is Δf2. In this case, Δf1 and Δf2 are close but opposite in sign, preventing the terminal from correctly demodulating the received data.

[0103] To solve the problem that the terminal is affected by multiple Doppler offsets, the base station can estimate the Doppler offset based on the uplink signal and perform pre-correction when the terminal receives data, and the general steps are as follows:

[0104] Step 1: RRH1 and RRH2 transmit synchronization signal and PBCH block (SSB) resource sets SSB1 and SSB2, respectively.

[0105] Step 2: The terminal roughly estimates offsets Δf1 and Δf2 based on SSB1 and SSB2, respectively, and adjusts the crystal frequency based on the offset estimation result of SSB1 or SSB2. For example, the terminal adjusts the crystal frequency to fc+Δf1 (fc is the base station crystal frequency) based on the SSB1 estimation result Δf1.

[0106] Step 3: RRH1 and RRH2 transmit TRS resource sets TRS1 and TRS2, respectively.

[0107] Step 4: The terminal accurately estimates the current offsets Δf1' and Δf2' based on TRS1 and TRS2, respectively (when not considering the SSB and TRS estimation error cases, Δf1' = 0 and Δf2' = Δf2 - Δf1), and adjusts the crystal oscillator frequency based on the offset estimation result of TRS1 or TRS2. For example, based on the estimation result Δf1' of TRS1, the crystal oscillator frequency is adjusted to fc + Δf1 + Δf1'.

[0108] Step 5: The terminal transmits an uplink SRS reference signal at frequency fc+Δf1+Δf1′, and the base station estimates the Doppler offsets Δf1 and Δf2 based on the SRS reference signal or other reference signals.

[0109] Step 6: The base station keeps the downlink frequency of RRH1 as fc, adjusts the downlink frequency of RRH2 to fc+Δf1-Δf2, and transmits downlink PDSCH data.

[0110] Step seven: The terminal receives the downlink PDSCH data.

[0111] Since the Doppler offset has already been pre-corrected in step 6, there is no significant opposite Doppler offset in the downlink PDSCH data received by the terminal in step 7. If the estimation error is not taken into account, the Doppler offset value of the two symbols is cleared to 0. In this step, if a target is determined to use the offset pre-correction function, the terminal can correctly demodulate the received data.

[0112] This step may include determining to use the offset pre-correction function when the SFN transmission mode is adopted, i.e., when the network explicitly or implicitly indicates that the SFN transmission mode is adopted for transmission, the offset pre-correction function is also enabled.

[0113] wherein the target case includes one of the following:

[0114] If a second signaling is arranged or indicated to indicate to the network that the offset pre-correction function is enabled.

[0115] When the network equipment performs this step, the network equipment instructs the UE to use the offset pre-correction function by sending second signaling to the UE to indicate that the offset pre-correction function is enabled. In response, when the UE performs this step, the UE decides to use the offset pre-correction function by receiving the second signaling sent by the network equipment to indicate that the offset pre-correction function is enabled. The network equipment may configure or instruct this second signaling by RRC, MAC CE, or DCI network.

[0116] In addition, the network may be configured or instructed to provide signaling to indicate that the offset pre-correction function is not enabled or turned off, and when the UE receives this signaling, the UE decides to not enable or turn off the offset pre-correction function.

[0117] The TCI state indicated by the third signaling is related to an association relationship between an uplink signal and a downlink signal, and the elements of the association relationship include a Doppler offset. The TCI state indicated by the third signaling may be related to an association relationship between an uplink reference signal and a downlink reference signal, and an element of the association relationship may include a Doppler offset; or the TCI state indicated by the third signaling may be related to an association relationship between an uplink physical channel and a downlink reference signal, and an element of the association relationship may include a Doppler offset.

[0118] A second target QCL-Type is associated with the TCI state indicated by the fourth signaling, and the element corresponding to the second target QCL-Type does not include a Doppler offset.

[0119] The fifth signaling indicates a target tracking reference signal TRS or a target synchronization signal block SSB resource as an anchor point for adjusting the carrier frequency and / or timing, for example: The fifth signaling indicates 0 or no indication: it indicates that "offset pre-correction" is not turned on.

[0120] The fifth signaling indicates 1: indicates that the UE needs to reference the RS corresponding to the first TCI state in codepoint {TCI state1, TCI state2} as the anchor point, and indicates that "offset pre-correction" is enabled.

[0121] The fifth signaling indicates 2: indicates that the UE needs to reference the RS corresponding to the second TCI state in codepoint {TCI state1, TCI state2} as the anchor point, and indicates that "offset pre-correction" is enabled.

[0122] Similar to the second signaling, when this step is performed by a network equipment, the network equipment can instruct the UE whether to use the offset pre-correction function by sending the third signaling, the fourth signaling, or the fifth signaling to the UE. Correspondingly, when this step is performed by the UE, the UE determines whether to use the offset pre-correction function by receiving the third signaling, the fourth signaling, or the fifth signaling configured or instructed by the network equipment.

[0123] The third signaling, the fourth signaling, and the fifth signaling may be configured or indicated by RRC, MAC CE, or DCI. The third signaling, the fourth signaling, and the fifth signaling may employ the same signaling or different signaling.

[0124] In one implementation, when determining to use the offset pre-correction function, the uplink frequency may be adjusted based on the Doppler offset in the TCI state corresponding to the DMRS of the PDSCH or PDCCH. For example, when determining to use the offset pre-correction function, the UE may adjust the uplink frequency based on the Doppler offset in the TCI state corresponding to the DMRS of the PDSCH or PDCCH.

[0125] Therefore, the method for determining a transmission mode according to an embodiment of the present invention can determine an SFN transmission mode and determine whether to turn on offset pre-correction in various explicit or implicit manners, and facilitate the network and the terminal to perform corresponding processing.

[0126] As shown in FIG. 10, one embodiment of the present invention provides a method 1000 for determining a transmission mode, which may be performed by a terminal device and / or a network device, in other words, the method may be performed by software or hardware installed in the terminal device and / or the network device, and the method includes the following steps:

[0127] S1002: Determine a single frequency network (SFN) transmission mode according to a target indication method.

[0128] This step can be performed using the description of the embodiment shown in FIG. 2, and will not be further described here.

[0129] When the SFN transmission mode is adopted, if the RRC parameters include a certain parameter, the same transmission block is transmitted by multiple slot-level PDSCHs, and the PDSCHs of each slot are all transmitted in the SFN transmission mode.

[0130] One implementation does not allow higher layers to populate certain validation parameters, such as the SlotBased-r16 field.

[0131] In one implementation, if a predetermined enabling parameter is configured, the predetermined enabling parameter is not enabled, for example, if a higher layer configures the SlotBased-r16 field, it is silently not enabled, or if a higher layer configures the SlotBased-r16 field, SlotBased-r16 only applies to PDSCH-TimeDomainResourceAllocations in pdsch-TimeDomainAllocationList that do not include the RepNumR16 parameter.

[0132] The method for determining a transmission mode according to an embodiment of the present invention can combine SFN and slot-based overlap transmission schemes.

[0133] As shown in FIG. 11, one embodiment of the present invention provides a method 1100 for determining a transmission mode, which may be performed by a terminal device and / or a network device, in other words, the method may be performed by software or hardware installed in the terminal device and / or the network device, and the method includes the following steps:

[0134] S1102: Determine a single frequency network (SFN) transmission mode according to a target indication method.

[0135] S1104: If the SFN transmission mode is adopted, the fourth TCI state is applied.

[0136] Here, the plurality of downlink reference signal resources associated with the fourth TCI state include at least two target downlink reference signal resources, and the QCL-Type corresponding to the target downlink reference signal resources is not QCL-Type D.

[0137] In one implementation, if the QCL-Type corresponding to the target downlink reference signal resource is the same, one of the multiple downlink reference signal resources corresponding to the same QCL-Type is an anchor point, which is pre-configured or indicated by the network.

[0138] In one implementation, after determining the single frequency network SFN transmission mode through the target indication manner, the method further includes jointly referencing overlapping elements in the at least two target downlink reference signal resource QCL-Types.

[0139] It should be noted that in the method for determining a transmission mode according to the embodiment of the present application, the execution body may be a device for determining a transmission mode, or a control module for executing and loading the method in the device. In the embodiment of the present application, the execution and loading of the method for determining a transmission mode by the device for determining a transmission mode is taken as an example to describe the method for determining a transmission mode according to the embodiment of the present application.

[0140] 12 is a structural schematic diagram of an apparatus for determining a transmission mode according to an embodiment of the present invention. As shown in FIG.

[0141] The determining module 1201 is used to determine a single frequency network (SFN) transmission mode through a target indication manner, where the target indication manner includes one of a radio resource control (RRC) signaling indication manner, a target transmission configuration indication state (TCI) state indication manner, a manner in which the configured or indicated target parameters satisfy a predetermined parameter requirement, and an indication manner in which the physical downlink control channel (PDCCH) adopts the SFN transmission mode.

[0142] In one implementation, the apparatus 1200 for determining a transmission mode may further include a selection module for selecting at least one of the target performance schemes to determine the SFN transmission mode.

[0143] In one implementation, when the target indication method is an RRC signaling indication method, SFN indication information for indicating the SFN transmission mode is arranged in the RRC signaling, and the determination module 1201 is used to determine whether to adopt the SFN transmission mode according to the SFN indication information.

[0144] In one implementation, when SFN indication information for indicating the SFN transmission mode is configured in the RRC signaling, the determination module 1201 is further used to enable the SFN transmission mode by first signaling, where the first signaling is indicated by a media access control unit (MAC CE) or downlink control information (DCI).

[0145] In one implementation, when the target indication method is a target TCI state indication method and the target TCI state is a first target TCI state, the first target TCI state is associated with a first target quasi-collocation type QCL-type, where the first target QCL-type includes at least one of a first QCL-type whose elements are delay spread, a second QCL-type whose elements are mean delay and delay spread, a third QCL-type whose elements are Doppler spread, mean delay and delay spread, and a fourth QCL-type whose elements are Doppler offset, Doppler spread and delay spread.

[0146] In one implementation, the determining module 1201 is used to determine the SFN transmission mode according to the first target TCI state when a first preset condition is met, where the first preset condition includes at least one of: for a physical downlink shared channel (PDSCH) or a physical downlink control channel (PDCCH), a TCI state associated with the first target QCL-type exists in a TCI state configured by RRC; for a PDSCH, a TCI state associated with the first target QCL-type exists in a TCI state activated by a MAC CE; for a PDCCH, a TCI state associated with the first target QCL-type exists in a TCI state indicated by a MAC CE; and for a PDSCH, a TCI state associated with the first target QCL-type exists in a TCI state indicated by a DCI.

[0147] In one implementation, when the target indication manner is a target TCI state indication manner and the target TCI state is a second target TCI state, the second target TCI state is related to a target association relationship between an uplink signal and a downlink signal, where an element included in the target association relationship between the uplink signal and the downlink signal includes a Doppler offset.

[0148] In one implementation, the determining module 1201 is used to determine the SFN transmission mode according to the second target TCI state when a second preset condition is met, where the second preset condition includes at least one of: for a PDSCH or a PDCCH, a TCI state associated with the target-related relationship between the uplink and downlink signals exists in a TCI state configured by RRC; for a PDSCH, a TCI state associated with the target-related relationship between the uplink and downlink signals exists in a TCI state activated by a MAC CE; for a PDCCH, a TCI state associated with the target-related relationship between the uplink and downlink signals exists in a TCI state indicated by a MAC CE; and for a PDSCH, a TCI state associated with the target-related relationship between the uplink and downlink signals exists in a TCI state indicated by a DCI.

[0149] In one implementation, when the target indication manner is a target TCI state indication manner and the target TCI state is a third target TCI state, the multiple downlink reference signal resources associated with the third target TCI state include at least two target downlink reference signal resources, and the QCL-Type corresponding to the target downlink reference signal resources is not QCL-Type D.

[0150] In one implementation manner, the determining module 1201 is used to determine the SFN transmission mode according to a third target TCI state if a third preset condition is met, where the third preset condition includes at least one of the following: for a physical downlink shared channel (PDSCH) or a physical downlink control channel (PDCCH), the third target TCI state exists in a TCI state configured by RRC; for a PDSCH, the third target TCI state exists in a TCI state activated by a MAC CE; for a PDCCH, the third target TCI state exists in a TCI state indicated by a MAC CE; and for a PDSCH, the third target TCI state exists in a TCI state indicated by a DCI.

[0151] In one implementation, if the QCL-Type corresponding to the target downlink reference signal resource is the same, one of the multiple downlink reference signal resources corresponding to the same QCL-Type is an anchor point, which is pre-configured or indicated by the network.

[0152] In one implementation, the determination module 1201 is further used to associate and reference overlapping elements in the at least two target downlink reference signal resource QCL-Types after determining the single frequency network SFN transmission mode according to the target indication manner.

[0153] In one implementation, when the target indication method is a method in which the configured or indicated target parameters satisfy a predetermined parameter requirement, the predetermined parameter requirement is that the target code division multiplexing CDM group number of the PDSCH demodulation reference signal DMRS port indicated by the DCI is a predetermined group number, the corresponding TCI State number is a predetermined type, and there is no predetermined enabled parameter configuration in the RRC configuration parameters.

[0154] In one implementation, when the target indication method is an indication method for the PDCCH to adopt the SFN transmission mode, the determination module 1201 is used to implicitly indicate that the PDSCH adopts the SFN transmission mode when the PDCCH is transmitted using the SFN transmission mode.

[0155] In one implementation, if the RRC parameters include a certain parameter, the same transport block is transmitted by multiple slot-level PDSCHs, and the PDSCHs in each slot are all transmitted in the SFN transmission mode.

[0156] In one implementation, if a predetermined enabling parameter is configured, the predetermined enabling parameter is not enabled.

[0157] In one implementation, the determination module 1201 is further used to determine the use of an offset pre-correction function in the case of a target when the SFN transmission mode is adopted, where the case of the target includes one of the following cases: a second signaling is configured or indicated to indicate that the offset pre-correction function is enabled; the TCI state indicated by the third signaling is related to an association relationship between an uplink signal and a downlink signal, and the element of the association relationship includes a Doppler offset; a TCI state indicated by the fourth signaling is associated with a second target QCL-Type, and the element corresponding to the second target QCL-Type does not include a Doppler offset; or a fifth signaling indicates a target tracking reference signal TRS or a target synchronization signal block SSB resource as an anchor point for adjusting carrier frequency and / or timing.

[0158] In one implementation, if it is decided to use the offset pre-compensation function, the uplink frequency is adjusted based on the Doppler offset in the TCI state corresponding to the DMRS of the PDSCH or PDCCH.

[0159] In one implementation, the determining module 1201 is further used to apply a fourth TCI state when the SFN transmission mode is adopted, where the plurality of downlink reference signal resources associated with the fourth TCI state include at least two target downlink reference signal resources, and the QCL-Type corresponding to the target downlink reference signal resources is not QCL-Type D.

[0160] In one implementation, if the QCL-Type corresponding to the target downlink reference signal resource is the same, one of the multiple downlink reference signal resources corresponding to the same QCL-Type is an anchor point, which is pre-configured or indicated by the network.

[0161] In one implementation, the determination module 1201 is further used to associate and reference overlapping elements of the at least two target downlink reference signal resource QCL-Types after determining the single frequency network SFN transmission mode according to the target indication manner.

[0162] The device for determining a transmission mode in the embodiments of the present application may be a device, or may be a component, integrated circuit, or chip in a terminal. This device may be a mobile electronic device or a non-mobile electronic device. For example, the mobile electronic device may be a mobile phone, a tablet PC, a laptop, a palmtop computer, an in-vehicle electronic device, a wearable device, an ultra-mobile personal computer (UMPC), a netbook, or a personal digital assistant (PDA), and the non-mobile electronic device may be a server, a network-attached storage (NAS), a personal computer (PC), a television (TV), a teller machine, or a self-service machine, and the embodiments of the present application are not specifically limited.

[0163] The device for determining the transmission mode in the embodiment of the present application may be a device having an operating system, which may be the Android operating system, the iOS operating system, or other possible operating systems, and the embodiment of the present application is not specifically limited.

[0164] The apparatus 1200 according to an embodiment of the present invention may refer to a flow corresponding to the method 200-1100 according to the embodiment of the present invention, and each unit / module and other operations and / or functions in this apparatus 1200 can be used to realize the corresponding flow in the method 200-1100, respectively, and can achieve the same or equivalent technical effects, and for the sake of brevity, will not be further described here.

[0165] Optionally, as shown in Figure 13, an embodiment of the present application further provides a communication device 1300, which includes a processor 1301, a memory 1302, and a program or instruction stored in the memory 1302 and operable on the processor 1301. For example, when the communication device 1300 is a terminal, the program or instruction can be executed by the processor 1301 to implement each process of the embodiment of the method for determining a transmission mode, and the same technical effect can be achieved. When the communication device 1300 is a network-side device, the program or instruction can be executed by the processor 1301 to implement each process of the embodiment of the method for determining a transmission mode, and the same technical effect can be achieved. In order to avoid repetition, no further description will be given here.

[0166] Specifically, an embodiment of the present application further provides a network side device. As shown in Fig. 14, the network side device 1400 includes an antenna 1401, a radio frequency device 1402, and a baseband device 1403. The antenna 1401 and the radio frequency device 1402 are connected to each other. In the uplink direction, the radio frequency device 1402 receives information through the antenna 1401 and transmits the received information to the baseband device 1403 for processing. In the downlink direction, the baseband device 1403 processes the information to be transmitted and transmits it to the radio frequency device 1402, and the radio frequency device 1402 processes the received information and then transmits it through the antenna 1401.

[0167] The above frequency band processing device may be located in a baseband device 1403, and the method performed by the network side equipment in the above embodiments may be implemented in the baseband device 1403, which includes a processor 1404 and a memory 1405.

[0168] The baseband device 1403 may include, for example, at least one baseband board, on which multiple chips are installed, and as shown in this figure, one of the chips is, for example, a processor 1404, which is connected to a memory 1405, and calls the program in the memory 1405 to perform the operations of the network equipment shown in the above method embodiments.

[0169] The baseband device 1403 may further include a network interface 1406, which is used to exchange information with the radio frequency device 1402, and this interface is, for example, a common public radio interface (abbreviated as CPRI).

[0170] Specifically, the network side device of the embodiment of the present invention further includes instructions or programs stored in the memory 1405 and operable on the processor 1404, and the processor 1404 invokes the instructions or programs in the memory 1405 to perform determining the single frequency network SFN transmission mode through a target indication manner, where the target indication manner includes one of a radio resource control (RRC) signaling indication manner, a target transmission configuration indication state (TCI) state indication manner, a manner in which the configured or indicated target parameters satisfy predetermined parameter requirements, and an indication manner in which the physical downlink control channel (PDCCH) adopts the SFN transmission mode.

[0171] In one implementation, when the target indication method is an RRC signaling indication method, SFN indication information for indicating the SFN transmission mode is arranged in the RRC signaling, and determining the single frequency network SFN transmission mode according to the target indication method includes determining whether to adopt the SFN transmission mode according to the SFN indication information.

[0172] In one implementation, when SFN indication information for indicating the SFN transmission mode is configured in the RRC signaling, the SFN transmission mode is enabled by a first signaling, where the first signaling is indicated by a media access control unit (MAC CE) or downlink control information (DCI).

[0173] In one implementation, when the target indication method is a target TCI state indication method and the target TCI state is a first target TCI state, the first target TCI state is associated with a first target quasi-collocation type QCL-type, where the first target QCL-type includes at least one of a first QCL-type whose elements are delay spread, a second QCL-type whose elements are mean delay and delay spread, a third QCL-type whose elements are Doppler spread, mean delay and delay spread, and a fourth QCL-type whose elements are Doppler offset, Doppler spread and delay spread.

[0174] In one implementation manner, determining the single frequency network SFN transmission mode in the target indication manner includes determining the SFN transmission mode according to the first target TCI state if a first preset condition is met, where the first preset condition includes at least one of: for a physical downlink shared channel (PDSCH) or a physical downlink control channel (PDCCH), a TCI state associated with the first target QCL-type exists in a TCI state configured by RRC; for a PDSCH, a TCI state associated with the first target QCL-type exists in a TCI state activated by a MAC CE; for a PDCCH, a TCI state associated with the first target QCL-type exists in a TCI state indicated by a MAC CE; and for a PDSCH, a TCI state associated with the first target QCL-type exists in a TCI state indicated by a DCI.

[0175] In one implementation, when the target indication manner is a target TCI state indication manner and the target TCI state is a second target TCI state, the second target TCI state is related to a target association relationship between an uplink signal and a downlink signal, where an element included in the target association relationship between the uplink signal and the downlink signal includes a Doppler offset.

[0176] In one implementation, determining a single frequency network SFN transmission mode through a target indication manner includes determining the SFN transmission mode according to the second target TCI state if a second preset condition is met, wherein the second preset condition includes at least one of: for a PDSCH or a PDCCH, a TCI state associated with the target-related relationship between the uplink and downlink signals exists in a TCI state configured by RRC; for a PDSCH, a TCI state associated with the target-related relationship between the uplink and downlink signals exists in a TCI state activated by a MAC CE; for a PDCCH, a TCI state associated with the target-related relationship between the uplink and downlink signals exists in a TCI state indicated by a MAC CE; and for a PDSCH, a TCI state associated with the target-related relationship between the uplink and downlink signals exists in a TCI state indicated by a DCI.

[0177] In one implementation, when the target indication manner is a target TCI state indication manner and the target TCI state is a third target TCI state, the multiple downlink reference signal resources associated with the third target TCI state include at least two target downlink reference signal resources, and the QCL-Type corresponding to the target downlink reference signal resources is not QCL-Type D.

[0178] In one implementation manner, determining the single frequency network SFN transmission mode through the target indication manner includes determining the SFN transmission mode according to a third target TCI state if a third preset condition is met, where the third preset condition includes at least one of: for a physical downlink shared channel (PDSCH) or a physical downlink control channel (PDCCH), the third target TCI state exists in a TCI state configured by RRC; for a PDSCH, the third target TCI state exists in a TCI state activated by a MAC CE; for a PDCCH, the third target TCI state exists in a TCI state indicated by a MAC CE; and for a PDSCH, the third target TCI state exists in a TCI state indicated by a DCI.

[0179] In one implementation, if the QCL-Type corresponding to the target downlink reference signal resource is the same, one of the multiple downlink reference signal resources corresponding to the same QCL-Type is an anchor point, which is pre-configured or indicated by the network.

[0180] In one implementation, after determining the single frequency network SFN transmission mode through the target indication method, the method further performs a joint reference to overlapping elements in the at least two target downlink reference signal resource QCL-Types.

[0181] In one implementation, when the target indication method is a method in which the configured or indicated target parameters satisfy a predetermined parameter requirement, the predetermined parameter requirement is that the target code division multiplexing CDM group number of the PDSCH demodulation reference signal DMRS port indicated by the DCI is a predetermined group number, the corresponding TCI State number is a predetermined type, and there is no predetermined enabled parameter configuration in the RRC configuration parameters.

[0182] In one implementation, when the target indication manner is an indication manner that the PDCCH adopts the SFN transmission mode, determining the single frequency network SFN transmission mode according to the target indication manner includes implicitly indicating that the PDSCH adopts the SFN transmission mode when the PDCCH is transmitted using the SFN transmission mode.

[0183] In one implementation, if the RRC parameters include a certain parameter, the same transport block is transmitted by multiple slot-level PDSCHs, and the PDSCHs in each slot are all transmitted in the SFN transmission mode.

[0184] In one implementation, if a predetermined enabling parameter is configured, the predetermined enabling parameter is not enabled.

[0185] In one implementation, when the SFN transmission mode is adopted, the method further includes determining to use an offset pre-correction function in the case of a target, where the case of the target includes one of the following cases: a second signaling is configured or indicated to indicate that the offset pre-correction function is enabled; the TCI state indicated by the third signaling is related to an association relationship between an uplink signal and a downlink signal, and the element of the association relationship includes a Doppler offset; a second target QCL-Type is associated with the TCI state indicated by the fourth signaling, and the element corresponding to the second target QCL-Type does not include a Doppler offset; and a fifth signaling indicates a target tracking reference signal TRS or a target synchronization signal block SSB resource as an anchor point for adjusting carrier frequency and / or timing.

[0186] In one implementation, if it is decided to use the offset pre-compensation function, the uplink frequency is adjusted based on the Doppler offset in the TCI state corresponding to the DMRS of the PDSCH or PDCCH.

[0187] In one implementation, when the SFN transmission mode is adopted, a fourth TCI state is further applied, where the plurality of downlink reference signal resources associated with the fourth TCI state include at least two target downlink reference signal resources, and the QCL-Type corresponding to the target downlink reference signal resources is not QCL-Type D.

[0188] In one implementation, if the QCL-Type corresponding to the target downlink reference signal resource is the same, one of the multiple downlink reference signal resources corresponding to the same QCL-Type is an anchor point, which is pre-configured or indicated by the network.

[0189] In one implementation, after determining the single frequency network SFN transmission mode through the target indication manner, the processor 1404 further performs a joint reference to the overlapping elements of the at least two target downlink reference signal resources QCL-Type. The specific steps performed by the processor 1404 are the same as those performed in each step of the method 200-1100, and can achieve the same technical effects. To avoid repetition, they will not be further described herein.

[0190] FIG. 15 is a schematic diagram of the terminal hardware structure for implementing an embodiment of the present application.

[0191] The terminal device 1500 includes components such as, but not limited to, a radio frequency unit 1501, a network module 1502, an audio output unit 1503, an input unit 1504, a sensor 1505, a display unit 1506, a user input unit 1507, an interface unit 1508, a memory 1509, and a processor 1510.

[0192] As will be understood by those skilled in the art, the terminal device 1500 may further include a power source (e.g., a battery) for powering each component, and the power source may be logically connected to the processor 1510 by a power management system, thereby enabling the power management system to realize functions such as charge / discharge management and power consumption management. The terminal device structure shown in the figure does not constitute a limitation on the terminal device, and the terminal device may include more or fewer components than those shown, or a combination of some components, or a different arrangement of components, which will not be further described here.

[0193] It should be understood that in the embodiment of the present application, the input unit 1504 may include a graphics processing unit (GPU) 15041 and a microphone 15042, and the graphics processor 15041 processes image data of still or video images captured by an image capture device (e.g., a camera) in a video capture mode or an image capture mode. The display unit 1506 may include a display panel 15061, and the display panel 15061 may be arranged in the form of a liquid crystal display, an organic light-emitting diode, or the like. The user input unit 1507 includes a touch panel 15071 and other input devices 15072. The touch panel 15071 is also called a touch screen. The touch panel 15071 may include two parts: a touch detection device and a touch controller. The other input devices 15072 may include, but are not limited to, a physical keyboard, function keys (e.g., volume control buttons, switch buttons, etc.), a trackball, a mouse, and a control lever, which will not be further described herein.

[0194] In the embodiment of the present application, the radio frequency unit 1501 receives downlink data from the network side device, then processes the data in the processor 1510, and transmits uplink data to the network side device. Generally, the radio frequency unit 1501 includes, but is not limited to, an antenna, at least one amplifier, a transceiver, a coupler, a low-noise amplifier, a duplexer, etc.

[0195] The memory 1509 may be used to store software programs or instructions and various data. The memory 1509 may primarily include a program or instruction storage area and a data storage area, where the program or instruction storage area can store an operating system, an application program or instructions required for at least one function (e.g., audio playback function, image playback function, etc.), etc. The memory 1509 may include high-speed random access memory or nonvolatile memory, where the nonvolatile memory may be read-only memory (ROM), programmable read-only memory (PROM), erasable programmable read-only memory (EPROM), electrically erasable programmable read-only memory (EEPROM), or flash memory. For example, the memory 1509 may be at least one magnetic disk memory device, flash memory device, or other nonvolatile solid-state memory device.

[0196] The processor 1510 may include one or more processing units. Optionally, the processor 1510 may integrate an application processor and a modem processor. Here, the application processor mainly processes an operating system, a user interface, and application programs or instructions, and the modem processor mainly processes wireless communication, such as a baseband processor. As can be appreciated, the modem processor does not have to be integrated into the processor 1510.

[0197] Here, the processor 1510 may be used to determine the single frequency network (SFN) transmission mode through a target indication scheme, where the target indication scheme includes one of a radio resource control (RRC) signaling indication scheme, a target transmission configuration indication state (TCI) state indication scheme, a scheme in which the configured or indicated target parameters satisfy a predetermined parameter requirement, and an indication scheme in which the physical downlink control channel (PDCCH) adopts the SFN transmission mode.

[0198] In one implementation, when the target indication method is an RRC signaling indication method, SFN indication information for indicating the SFN transmission mode is arranged in the RRC signaling, and determining the single frequency network SFN transmission mode according to the target indication method includes determining whether to adopt the SFN transmission mode according to the SFN indication information.

[0199] In one implementation, when SFN indication information for indicating the SFN transmission mode is configured in the RRC signaling, the SFN transmission mode is enabled by a first signaling, where the first signaling is indicated by a media access control unit (MAC CE) or downlink control information (DCI).

[0200] In one implementation, when the target indication method is a target TCI state indication method and the target TCI state is a first target TCI state, the first target TCI state is associated with a first target quasi-collocation type QCL-type, where the first target QCL-type includes at least one of a first QCL-type whose elements are delay spread, a second QCL-type whose elements are mean delay and delay spread, a third QCL-type whose elements are Doppler spread, mean delay and delay spread, and a fourth QCL-type whose elements are Doppler offset, Doppler spread and delay spread.

[0201] In one implementation manner, determining the single frequency network SFN transmission mode in the target indication manner includes determining the SFN transmission mode according to the first target TCI state if a first preset condition is met, where the first preset condition includes at least one of: for a physical downlink shared channel (PDSCH) or a physical downlink control channel (PDCCH), a TCI state associated with the first target QCL-type exists in a TCI state configured by RRC; for a PDSCH, a TCI state associated with the first target QCL-type exists in a TCI state activated by a MAC CE; for a PDCCH, a TCI state associated with the first target QCL-type exists in a TCI state indicated by a MAC CE; and for a PDSCH, a TCI state associated with the first target QCL-type exists in a TCI state indicated by a DCI.

[0202] In one implementation, when the target indication manner is a target TCI state indication manner and the target TCI state is a second target TCI state, the second target TCI state is related to a target association relationship between an uplink signal and a downlink signal, where an element included in the target association relationship between the uplink signal and the downlink signal includes a Doppler offset.

[0203] In one implementation, determining a single frequency network SFN transmission mode through a target indication manner includes determining the SFN transmission mode according to the second target TCI state if a second preset condition is met, wherein the second preset condition includes at least one of: for a PDSCH or a PDCCH, a TCI state associated with the target-related relationship between the uplink and downlink signals exists in a TCI state configured by RRC; for a PDSCH, a TCI state associated with the target-related relationship between the uplink and downlink signals exists in a TCI state activated by a MAC CE; for a PDCCH, a TCI state associated with the target-related relationship between the uplink and downlink signals exists in a TCI state indicated by a MAC CE; and for a PDSCH, a TCI state associated with the target-related relationship between the uplink and downlink signals exists in a TCI state indicated by a DCI.

[0204] In one implementation, when the target indication manner is a target TCI state indication manner and the target TCI state is a third target TCI state, the multiple downlink reference signal resources associated with the third target TCI state include at least two target downlink reference signal resources, and the QCL-Type corresponding to the target downlink reference signal resources is not QCL-Type D.

[0205] In one implementation manner, determining the single frequency network SFN transmission mode through the target indication manner includes determining the SFN transmission mode according to a third target TCI state if a third preset condition is met, where the third preset condition includes at least one of: for a physical downlink shared channel (PDSCH) or a physical downlink control channel (PDCCH), the third target TCI state exists in a TCI state configured by RRC; for a PDSCH, the third target TCI state exists in a TCI state activated by a MAC CE; for a PDCCH, the third target TCI state exists in a TCI state indicated by a MAC CE; and for a PDSCH, the third target TCI state exists in a TCI state indicated by a DCI.

[0206] In one implementation, if the QCL-Type corresponding to the target downlink reference signal resource is the same, one of the multiple downlink reference signal resources corresponding to the same QCL-Type is an anchor point, which is pre-configured or indicated by the network.

[0207] In one implementation, after determining the single frequency network SFN transmission mode through the target indication method, the method further performs a joint reference to overlapping elements in the at least two target downlink reference signal resource QCL-Types.

[0208] In one implementation, when the target indication method is a method in which the configured or indicated target parameters satisfy a predetermined parameter requirement, the predetermined parameter requirement is that the target code division multiplexing CDM group number of the PDSCH demodulation reference signal DMRS port indicated by the DCI is a predetermined group number, the corresponding TCI State number is a predetermined type, and there is no predetermined enabled parameter configuration in the RRC configuration parameters.

[0209] In one implementation, when the target indication manner is an indication manner that the PDCCH adopts the SFN transmission mode, determining the single frequency network SFN transmission mode according to the target indication manner includes implicitly indicating that the PDSCH adopts the SFN transmission mode when the PDCCH is transmitted using the SFN transmission mode.

[0210] In one implementation, if the RRC parameters include a certain parameter, the same transport block is transmitted by multiple slot-level PDSCHs, and the PDSCHs in each slot are all transmitted in the SFN transmission mode.

[0211] In one implementation, if a predetermined enabling parameter is configured, the predetermined enabling parameter is not enabled.

[0212] In one implementation, when the SFN transmission mode is adopted, the method further includes determining to use an offset pre-correction function in the case of a target, where the case of the target includes one of the following cases: a second signaling is configured or indicated to indicate that the offset pre-correction function is enabled; the TCI state indicated by the third signaling is related to an association relationship between an uplink signal and a downlink signal, and the element of the association relationship includes a Doppler offset; a second target QCL-Type is associated with the TCI state indicated by the fourth signaling, and the element corresponding to the second target QCL-Type does not include a Doppler offset; and a fifth signaling indicates a target tracking reference signal TRS or a target synchronization signal block SSB resource as an anchor point for adjusting carrier frequency and / or timing.

[0213] In one implementation, if it is decided to use the offset pre-compensation function, the uplink frequency is adjusted based on the Doppler offset in the TCI state corresponding to the DMRS of the PDSCH or PDCCH.

[0214] In one implementation, when the SFN transmission mode is adopted, a fourth TCI state is further applied, where the plurality of downlink reference signal resources associated with the fourth TCI state include at least two target downlink reference signal resources, and the QCL-Type corresponding to the target downlink reference signal resources is not QCL-Type D.

[0215] In one implementation, if the QCL-Type corresponding to the target downlink reference signal resource is the same, one of the multiple downlink reference signal resources corresponding to the same QCL-Type is an anchor point, which is pre-configured or indicated by the network.

[0216] In one implementation, after determining the single frequency network SFN transmission mode through the target indication manner, further performs concatenated reference to the overlapping elements of the at least two target downlink reference signal resource QCL-Types. The terminal device 1500 of the embodiment of the present invention may refer to the flow corresponding to the method 200-1100 of the embodiment of the present invention, and each unit / module and the above-mentioned other operations and / or functions in the terminal device 1500 are respectively used to realize the corresponding flow in the method 200-1100, and can achieve the same or equivalent technical effects, and for brevity, will not be further described herein.

[0217] The embodiments of the present application further provide a readable storage medium, on which a program or instruction is stored, which, when executed by a processor, can realize each process of the embodiment of the method for determining a transmission mode, and achieve the same technical effect. In order to avoid repetition, no further description will be given here.

[0218] The processor may be the processor in the electronic device described in the above embodiment. The readable storage medium may include a computer-readable storage medium, such as a computer read-only memory (ROM), a random access memory (RAM), a magnetic disk, or an optical disk.

[0219] The embodiments of the present application further provide a chip, the chip including a processor and a communication interface, the communication interface is coupled to the processor, and the processor is used to run a program or instruction to realize each process of the embodiments of the method for determining a transmission mode, and can achieve the same technical effect. In order to avoid repetition, no further description will be given here.

[0220] It should be understood that the chips referred to in the embodiments of this application may be referred to as system level chips, system chips, chip systems, or system-on-chips.

[0221] An embodiment of the present application further provides a computer program product, the computer program product including a processor, a memory, and a program or instruction stored in the memory and operable to run on the processor, the program or instruction implementing the steps of the method according to the first aspect when executed by the processor.

[0222] It should be noted that, in this specification, the terms "comprise," "include," "includes," or any other variations thereof are intended to cover the non-exclusive "comprise," whereby a process, method, article, or apparatus comprising a set of elements not only includes those elements, but also other elements not expressly listed or inherent in such process, method, article, or apparatus. Absent further limitations, an element defined by the phrase "comprises one of" does not preclude the presence of other identical elements in the process, method, article, or apparatus comprising that element. It should be noted that the scope of the methods and apparatuses in the embodiments of this application is not limited to performing functions in the order shown or discussed, but may include performing functions in an essentially simultaneous manner or in the reverse order based on the functions involved. For example, the described method may be performed in a different order than described, and various steps may be added, omitted, or combined. Furthermore, features described with reference to some examples may be combined in other examples.

[0223] As will be apparent to those skilled in the art from the above description of the embodiments, the methods of the above embodiments can be realized in the form of software and a necessary general-purpose hardware platform. Of course, they can also be realized in hardware, but in many cases the former is a more preferred embodiment. Based on this understanding, the technical solution of the present application, in substance or in part contributing to the prior art, may be embodied in the form of a software product. This computer software product is stored in a storage medium (e.g., ROM / RAM, magnetic disk, optical disk) and includes some instructions for causing a terminal (which may be a mobile phone, computer, server, network device, etc.) to execute the methods described in each embodiment of the present application.

[0224] Although the embodiments of the present application have been described above in conjunction with the drawings, the present application is not limited to the above specific embodiments. The above specific embodiments are merely illustrative and not limiting. Those skilled in the art can implement many forms under the guidance of the present application as long as they do not deviate from the spirit and scope of protection of the claims, and all of them fall within the scope of protection of the present application.

Claims

1. A method for determining a transmission mode to be implemented by a terminal device, comprising: determining whether to adopt a single frequency network (SFN) transmission mode according to a radio resource control (RRC) signaling indication manner; SFN indication information for indicating the SFN transmission mode is arranged in the RRC signaling, The determining whether to adopt the SFN transmission mode according to the RRC signaling indication manner includes: determining whether to adopt an SFN transmission mode according to the SFN indication information; The method comprises: and enabling the SFN transmission mode by first signaling; wherein the first signaling is indicated by a MAC CE (Media Access Control Entity) or a DCI (Downlink Control Information).

2. The MAC CE is a MAC CE for activating or indicating a TCI state, Or, The method of claim 1 , wherein the DCI is a DCI for indicating a TCI state.

3. The method according to claim 1 , wherein, when the RRC parameters include a predetermined parameter, the same transport block is transmitted by multiple slot-level PDSCHs, and the PDSCHs of each slot are all transmitted in the SFN transmission mode.

4. The method comprises: When adopting the SFN transmission mode, the method further includes determining, in a target case, to use an offset pre-correction function, where in the target case, A second signaling is arranged or indicated to indicate that an offset pre-correction function is enabled; and The TCI state indicated by the third signaling is related to an association relationship between an uplink signal and a downlink signal, and the elements of the association relationship include a Doppler offset; A second target QCL-Type is associated with the TCI state indicated by the fourth signaling, and an element corresponding to the second target QCL-Type does not include a Doppler offset; and indicating a target tracking reference signal (TRS) or a target synchronization signal block (SSB) resource as an anchor point for adjusting a carrier frequency and / or timing by the fifth signaling.

5. The method of claim 4 , wherein when determining to use the offset pre-correction function, the uplink frequency is adjusted based on a Doppler offset in a TCI state corresponding to a DMRS of a PDSCH or a PDCCH.

6. The method comprises: The method of claim 1, further comprising: applying a fourth TCI state when the SFN transmission mode is adopted, wherein at least two target downlink reference signal resources exist among the plurality of downlink reference signal resources associated with the fourth TCI state, and a QCL-Type corresponding to the target downlink reference signal resource is non-QCL-Type D.

7. A method for determining a transmission mode to be implemented by a network device, comprising: determining whether to adopt an SFN transmission mode according to an RRC signaling indication manner; SFN indication information for indicating the SFN transmission mode is arranged in the RRC signaling, The determining whether to adopt the SFN transmission mode according to the RRC signaling indication manner includes: determining whether to adopt an SFN transmission mode according to the SFN indication information; The method comprises: and enabling the SFN transmission mode by first signaling; wherein the first signaling is indicated by a MAC CE or a DCI.

8. The MAC CE is a MAC CE for activating or indicating a TCI state, Or, The method of claim 7, wherein the DCI is a DCI for indicating a TCI state.

9. The method described in claim 7, wherein when the RRC parameters include a predetermined parameter, the same transmission block is transmitted by multiple slot-level PDSCHs, and the PDSCHs of each slot are all transmitted in the SFN transmission mode.

10. The method according to claim 1, When adopting the SFN transmission mode, the method further includes determining, in a target case, to use an offset pre-correction function, where in the target case, A second signaling is arranged or indicated to indicate that an offset pre-correction function is enabled; and The TCI state indicated by the third signaling is related to an association relationship between an uplink signal and a downlink signal, and the elements of the association relationship include a Doppler offset; A second target QCL-Type is associated with the TCI state indicated by the fourth signaling, and an element corresponding to the second target QCL-Type does not include a Doppler offset; The method according to claim 7, further comprising one of indicating a target tracking reference signal TRS or a target synchronization signal block SSB resource by the fifth signaling as an anchor point for adjusting a carrier frequency and / or timing.

11. The method of claim 10, wherein when it is determined to use the offset pre-correction function, the uplink frequency is adjusted based on a Doppler offset in a TCI state corresponding to the DMRS of the PDSCH or PDCCH.

12. The method according to claim 1, 8. The method of claim 7, further comprising: applying a fourth TCI state when the SFN transmission mode is adopted, wherein at least two target downlink reference signal resources exist among the plurality of downlink reference signal resources associated with the fourth TCI state, and a QCL-Type corresponding to the target downlink reference signal resource is non-QCL-Type D.

13. A terminal device comprising a processor, a memory, and a program or instructions stored in said memory and running on said processor for carrying out the method for determining a transmission mode according to any one of claims 1 to 6.

14. A network device comprising a processor, a memory, and a program or instructions stored in said memory and runnable on said processor for carrying out the method for determining a transmission mode according to any one of claims 7 to 12.

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