Method for parameter configuration for frequency modulation

Abstract

Wireless communication methods, systems, and devices for parameter configuration for frequency modulation. A wireless communication method includes transmitting an uplink (UL) signal, where the UL signal is modulated according to a particular carrier frequency based on an event associated with a first downlink (DL) reference signal (RS).

Description

Technical Field

[0001] This document generally relates to wireless communication. Background Technology

[0002] With the development of global high-speed train (HST) networks, HST scenarios have become important New Radio (NR) 5G deployment scenarios, especially in Asia. Considering the extremely high speed of HST and the limited coverage of a single NR-TRP (NR-TRP) station, multiple TRPs and remote radio heads (RRHs) are widely used to establish single-frequency networks (SFNs), where mobility between different TRPs (RRHs) is transparent from the user equipment (UE) perspective (i.e., the potential complexity of handover functionality should be avoided). From a system perspective, there are narrow cells along the HST railway.

[0003] In HST scenarios, train speeds can reach 350 km / h or even higher. In HST, UE communication performance becomes a serious issue. As usual, operators deploy numerous gNBs along the HST railway. Handover between gNBs is complex, and simultaneously, considering the rapid movement of the HST, multiple TRP / RRHs belong to a single SFN, such as... Figure 1 As shown. From the UE's perspective, when the UE passes through the SFN, there is no cell-level mobility / handover.

[0004] exist Figure 1 In this scenario, multiple TRPs / RRHs (e.g., RRH0, RRH1, RRH2, and RRH3) simultaneously transmit downlink (DL) signals to the UE in the SFN. Since the UE may experience different fading depending on the TRP / RRH, the UE can achieve significant diversity gain.

[0005] However, there are different Doppler shifts between each of the different TRP / RRHs and the UE. Furthermore, when the TRP / RRHs have the same center frequency, from the UE's perspective, the center frequencies of the DL signals from each of the TRP / RRHs can be different. In this case, severe inter-symbol interference (ISI) may occur for adjacent subcarriers in Orthogonal Frequency Division Multiplexing (OFDM). Summary of the Invention

[0006] This document relates to methods, systems, and devices for configuring parameters for frequency modulation.

[0007] This disclosure relates to a wireless communication method for use in a wireless terminal. The wireless communication method includes:

[0008] Send uplink UL signal,

[0009] Specifically, the UL signal is modulated according to a specific carrier frequency based on events associated with the first downlink DL reference signal RS.

[0010] Various embodiments may preferably implement the following features:

[0011] Preferably, the event is indicated by one of the following: the UL signal does not refer to the first DL RS or to the local carrier frequency, or the first DL RS is not configured and the specific carrier frequency is the local carrier frequency or the carrier frequency of the wireless terminal.

[0012] Preferably, the event is that the UL signal is associated with the first DL RS, and the specific carrier frequency is the carrier frequency of the first DL RS.

[0013] Preferably, the first DL RS is received no later than or before the command to send or schedule the UL signal.

[0014] Preferably, at least one sample of the first DL RS is received no later than or before the command to send the UL signal or the command to send the UL signal is dispatched.

[0015] Preferably, a specific carrier frequency is applied based on an effective time, which is determined based on a command associated with the first DL RS, a command associated with the parameter status of the first DL RS, or at least one sample of the first DL RS.

[0016] Preferably, the UL signal is sent no earlier than or after the effective time, and the specific carrier frequency is the carrier frequency of the first DL RS.

[0017] Preferably, the UL signal is sent no later than or before the effective time; and the specific carrier frequency is not determined based on the first DL RS or based on the most recently used carrier frequency.

[0018] Preferably, the first DL RS is determined based on the state of a first parameter applied to the UL signal.

[0019] Preferably, the first DL RS is a reference RS in the first parameter state and is associated with at least one of the carrier frequency or Doppler shift.

[0020] Preferably, the first DL RS is associated with a QCL type parameter that includes at least one of the carrier frequency or Doppler shift.

[0021] Preferably, the first DL RS is associated with QCL-TYPEA, QCL-TYPEB, or QCL-TYPEC.

[0022] Preferably, the first DL RS is configured by Radio Resource Control (RRC) signaling or activated by Media Access Control (MAC-CE) command.

[0023] Preferably, the RRC signaling or MAC-CE command is applied to the cell or carrier component, and the UL signal is in the cell or carrier component.

[0024] Preferably, the first DL RS is configured in at least one of the uplink physical control channel (PUCCH) configuration signaling, the uplink physical shared channel (PUSCH) configuration signaling, or the sounding reference signal (SRS) configuration signaling, or is configured for at least one of PUCCH resources, PUCCH resource groups, PUCCH resource sets, SRS resources, or SRS resource sets.

[0025] Preferably, the first DL RS is a Channel State Information (CSI) RS or a Tracking RS (TRS) for tracking.

[0026] Preferably, the first DL RS is configured with a physical cell index and a reference RS regarding QCL type parameters.

[0027] Preferably, the first DL RS is configured with a second parameter state, wherein the second parameter state includes a physical cell index and a reference RS regarding QCL type parameters.

[0028] Preferably, the parameter state including the first DL RS is activated using a third parameter state, which includes a reference RS regarding the QCL type parameter.

[0029] Preferably, the QCL assumption of the first DL RS is determined based on the third parameter state, or the third parameter state is applied to the first DL RS.

[0030] Preferably, the parameter state including the first DL RS is activated for the downlink physical control channel PDCCH, downlink physical shared channel PDSCH, uplink physical control channel PUCCH, or uplink physical shared channel PUSCH.

[0031] Preferably, the parameter state including the first DL RS is determined based on at least one of the following:

[0032] This corresponds to the hybrid automatic repeat request acknowledgment (HARQ-Ack) message of the PDSCH that carries the parameter state of the MAC-CE, including the activation of the first DL RS.

[0033] RS transmission timing, or

[0034] DL control information that triggers the transmission of the first DL RS.

[0035] Preferably, the QCL type parameter includes Doppler frequency shift.

[0036] Preferably, the reference RS is the synchronization signal block SSB.

[0037] Preferably, the frequency offset parameter is configured or activated for the UL signal, the first DL RS, or a parameter state including the first DL RS, and wherein the UL signal is further modulated according to the frequency offset parameter.

[0038] Preferably, the frequency offset parameter is associated with a timestamp or time-domain step size.

[0039] Preferably, the first DL RS or the parameter state including the first DL RS is associated with a timestamp or time-domain step.

[0040] Preferably, the timestamp or time-domain step size is configured by RRC signaling or MAC-CE command.

[0041] Preferably, the parameter status is the quasi-co-located QCL status, the transmission configuration indication (TCI) status, spatial relationship information, RS, reference RS, physical random access channel (PRACH), spatial filter, or precoding.

[0042] This disclosure relates to a wireless communication method for use in a wireless network node. The wireless communication method includes:

[0043] Send the first downlink DL reference signal RS to the wireless terminal, and

[0044] Receive uplink UL signal from wireless terminal.

[0045] Specifically, the UL signal is modulated according to a specific carrier frequency based on the event associated with the first DL RS.

[0046] Various embodiments may preferably implement the following features:

[0047] Preferably, the event is indicated by one of the following: the UL signal does not refer to the first DL RS or to the local carrier frequency, or the first DL RS is not configured and the specific carrier frequency is the local carrier frequency or the carrier frequency of the wireless terminal.

[0048] Preferably, the event is that the UL signal is associated with the first DL RS, and the specific carrier frequency is the carrier frequency of the first DL RS.

[0049] Preferably, the first DL RS is sent no later than or before the command to receive or schedule the UL signal.

[0050] Preferably, at least one sample of the first DL RS is sent no later than or before the command to receive or schedule the UL signal.

[0051] Preferably, a specific carrier frequency is applied based on an effective time, which is determined based on a command associated with the first DL RS, a command associated with the parameter status of the first DL RS, or at least one sample of the first DL RS.

[0052] Preferably, the UL signal is received no earlier than or after the effective time, and the specific carrier frequency is the carrier frequency of the first DL RS.

[0053] Preferably, the UL signal is received no later than or before the effective time; and the specific carrier frequency is not determined based on the first DL RS or based on the most recently used carrier frequency.

[0054] Preferably, the first DL RS is determined based on the state of a first parameter applied to the UL signal.

[0055] Preferably, the first DL RS is a reference RS in the first parameter state and is associated with at least one of the carrier frequency or Doppler shift.

[0056] Preferably, the first DL RS is associated with a QCL type parameter that includes at least one of the carrier frequency or Doppler shift.

[0057] Preferably, the first DL RS is associated with QCL-TYPEA, QCL-TYPEB, or QCL-TYPEC.

[0058] Preferably, the first DL RS is configured by Radio Resource Control (RRC) signaling or activated by Media Access Control (MAC-CE) command.

[0059] Preferably, the RRC signaling or MAC-CE command is applied to the cell or carrier component, and the UL signal is in the cell or carrier component.

[0060] Preferably, the first DL RS is configured in at least one of the uplink physical control channel (PUCCH) configuration signaling, the uplink physical shared channel (PUSCH) configuration signaling, or the sounding reference signal (SRS) configuration signaling, or is configured for at least one of PUCCH resources, PUCCH resource groups, PUCCH resource sets, SRS resources, or SRS resource sets.

[0061] Preferably, the first DL RS is a Channel State Information (CSI) RS or a Tracking RS (TRS) for tracking.

[0062] Preferably, the first DL RS is configured with a physical cell index and a reference RS regarding QCL type parameters.

[0063] Preferably, the first DL RS is configured with a second parameter state, wherein the second parameter state includes a physical cell index and a reference RS regarding QCL type parameters.

[0064] Preferably, the parameter state including the first DL RS is activated using a third parameter state, which includes a reference RS regarding the QCL type parameter.

[0065] Preferably, the QCL assumption of the first DL RS is determined based on the third parameter state, or the third parameter state is applied to the first DL RS.

[0066] Preferably, the parameter state including the first DL RS is activated for the downlink physical control channel PDCCH, downlink physical shared channel PDSCH, uplink physical control channel PUCCH, or uplink physical shared channel PUSCH.

[0067] Preferably, the parameter state including the first DL RS is determined based on at least one of the following:

[0068] This corresponds to the hybrid automatic repeat request acknowledgment (HARQ-Ack) message of the PDSCH that carries the parameter state of the MAC-CE, including the activation of the first DL RS.

[0069] RS transmission timing, or

[0070] DL control information that triggers the transmission of the first DL RS.

[0071] Preferably, the QCL type parameter includes Doppler frequency shift.

[0072] Preferably, the reference RS is the synchronization signal block SSB.

[0073] Preferably, the frequency offset parameter is configured or activated for the UL signal, the first DL RS, or a parameter state including the first DL RS, and wherein the UL signal is further modulated according to the frequency offset parameter.

[0074] Preferably, the frequency offset parameter is associated with a timestamp or time-domain step size.

[0075] Preferably, the first DL RS or the parameter state including the first DL RS is associated with a timestamp or time-domain step.

[0076] Preferably, the timestamp or time-domain step size is configured by RRC signaling or MAC-CE command.

[0077] Preferably, the parameter status is the quasi-co-located QCL status, the transmission configuration indication (TCI) status, spatial relationship information, RS, reference RS, physical random access channel (PRACH), spatial filter, or precoding.

[0078] This disclosure relates to a wireless communication method for use in a wireless terminal. The wireless communication method includes:

[0079] Receive downlink DL signal,

[0080] The DL signal is associated with at least one fourth parameter state, and

[0081] Among them, at least one of the fourth parameter states includes at least one second DL reference signal RS with respect to the first quasi-co-located QCL type parameter.

[0082] Various embodiments may preferably implement the following features:

[0083] Preferably, the first QCL type parameter includes Doppler frequency shift.

[0084] Preferably, the frequency offset parameter between the DL signal and at least one second DL RS is configured via RRC signaling or MAC-CE command.

[0085] Preferably, with respect to the first QCL type parameter, at least one third DL RS that is in at least one fourth parameter state and is not associated with the UL signal is ignored.

[0086] Preferably, the second DL RS is associated with the UL signal.

[0087] Preferably, the first QCL type parameter is QCL-TYPEA, QCL-TYPEB, or QCL-TYPEC.

[0088] Preferably, one of the at least four parameter states further includes a third DLRS with respect to the second QCL type parameter, wherein the second QCL type parameter does not include Doppler frequency shift and includes Doppler spread.

[0089] Preferably, the second QCL type parameter further includes at least one of average delay or delay spread.

[0090] Preferably, the first QCL type parameters include Doppler spread and Doppler frequency shift.

[0091] Preferably, the second DL RS is configured with a physical cell index and a reference RS regarding the third QCL type parameters.

[0092] Preferably, the second DL RS is configured with a fifth parameter state, wherein the fifth parameter state includes a physical cell index and a reference RS regarding the third QCL type parameter.

[0093] Preferably, the parameter state including the second DL RS is activated using a sixth parameter state, which includes a reference RS with respect to the third QCL type parameter.

[0094] Preferably, the QCL assumption of the second DL RS is determined based on the sixth parameter state, or the sixth parameter state is applied to the second DL RS.

[0095] Preferably, the parameter state including the second DL RS is activated for the downlink physical control channel PDCCH, downlink physical shared channel PDSCH, uplink physical control channel PUCCH, or uplink physical shared channel PUSCH.

[0096] Preferably, the parameter state including the second DL RS is determined based on at least one of the following:

[0097] This corresponds to the PDSCH hybrid automatic repeat request acknowledgment HARQ-Ack message that carries the MAC-CE command carrying the parameter state of the second DL RS for activation.

[0098] RS transmission timing, or

[0099] DL control information that triggers the transmission of the second DL RS.

[0100] Preferably, the third QCL type parameter includes Doppler frequency shift.

[0101] Preferably, the frequency offset parameter is configured or activated for the DL signal, the second DL RS, or a parameter state including the second DL RS, and wherein the DL signal is further received according to the frequency offset parameter.

[0102] Preferably, the frequency offset parameter is associated with a timestamp or time-domain step size.

[0103] Preferably, at least one of the fourth parameter states is associated with a timestamp or time-domain step.

[0104] Preferably, the timestamp or time-domain step can be configured by RRC signaling or MAC-CE command.

[0105] Preferably, the parameter status is the quasi-co-located QCL status, the transmission configuration indication (TCI) status, spatial relationship information, RS, reference RS, physical random access channel (PRACH), spatial filter, or precoding.

[0106] This disclosure relates to a wireless communication method for use in a wireless network node. The wireless communication method includes:

[0107] Send downlink DL signals to the wireless terminal.

[0108] The DL signal is associated with at least one fourth parameter state, and

[0109] Among them, at least one of the fourth parameter states includes at least one second DL reference signal RS with respect to the first quasi-co-located QCL type parameter.

[0110] Various embodiments may preferably implement the following features:

[0111] Preferably, the first QCL type parameter includes Doppler frequency shift.

[0112] Preferably, the frequency offset parameter between the DL signal and at least one second DL RS is configured via RRC signaling or MAC-CE command.

[0113] Preferably, with respect to the first QCL type parameter, at least one third DL RS that is in at least one fourth parameter state and is not associated with the UL signal is ignored.

[0114] Preferably, the second DL RS is associated with the UL signal.

[0115] Preferably, the first QCL type parameter is QCL-TYPEA, QCL-TYPEB, or QCL-TYPEC.

[0116] Preferably, one of the at least four parameter states further includes a third DLRS with respect to the second QCL type parameter, wherein the second QCL type parameter does not include Doppler frequency shift and includes Doppler spread.

[0117] Preferably, the second QCL type parameter further includes at least one of average delay or delay spread.

[0118] Preferably, the first QCL type parameters include Doppler spread and Doppler frequency shift.

[0119] Preferably, the second DL RS is configured with a physical cell index and a reference RS regarding the third QCL type parameters.

[0120] Preferably, the second DL RS is configured with a fifth parameter state, wherein the fifth parameter state includes a physical cell index and a reference RS regarding the third QCL type parameter.

[0121] Preferably, the parameter state including the second DL RS is activated using a sixth parameter state, which includes a reference RS with respect to the third QCL type parameter.

[0122] Preferably, the QCL assumption of the second DL RS is determined based on the sixth parameter state, or the sixth parameter state is applied to the second DL RS.

[0123] Preferably, the parameter state including the second DL RS is activated for the downlink physical control channel PDCCH, downlink physical shared channel PDSCH, uplink physical control channel PUCCH, or uplink physical shared channel PUSCH.

[0124] Preferably, the parameter state including the second DL RS is determined based on at least one of the following:

[0125] This corresponds to the PDSCH hybrid automatic repeat request acknowledgment HARQ-Ack message that carries the MAC-CE command carrying the parameter state of the second DL RS for activation.

[0126] RS transmission timing, or

[0127] DL control information that triggers the transmission of the second DL RS.

[0128] Preferably, the third QCL type parameter includes Doppler frequency shift.

[0129] Preferably, the frequency offset parameter is configured or activated for the DL signal, the second DL RS, or a parameter state including the second DL RS, and wherein the DL signal is further transmitted according to the frequency offset parameter.

[0130] Preferably, the frequency offset parameter is associated with a timestamp or time-domain step size.

[0131] Preferably, at least one of the fourth parameter states is associated with a timestamp or time-domain step.

[0132] Preferably, the timestamp or time-domain step can be configured by RRC signaling or MAC-CE command.

[0133] Preferably, the parameter status is the quasi-co-located QCL status, the transmission configuration indication (TCI) status, spatial relationship information, RS, reference RS, physical random access channel (PRACH), spatial filter, or precoding.

[0134] This disclosure relates to a wireless terminal, comprising:

[0135] The communication unit is configured as follows:

[0136] Send uplink UL signal,

[0137] Specifically, the UL signal is modulated according to a specific carrier frequency based on events associated with the first downlink DL reference signal RS.

[0138] Various embodiments may preferably implement the following features:

[0139] Preferably, the wireless terminal further includes a processor configured to perform any of the aforementioned wireless communication methods for the wireless terminal.

[0140] This disclosure relates to a wireless network node, including:

[0141] The communication unit is configured as follows:

[0142] Send the first downlink DL reference signal RS to the wireless terminal, and

[0143] Receive uplink UL signal from wireless terminal.

[0144] Specifically, the UL signal is modulated according to a specific carrier frequency based on the event associated with the first DL RS.

[0145] Various embodiments may preferably implement the following features:

[0146] Preferably, the wireless network node further includes a processor configured to perform any of the aforementioned wireless communication methods for the wireless network node.

[0147] This disclosure relates to a wireless terminal, comprising:

[0148] The communication unit is configured as follows:

[0149] Receive downlink DL signal,

[0150] The DL signal is associated with at least one fourth parameter state, and

[0151] Among them, at least one of the fourth parameter states includes at least one second DL reference signal RS with respect to the first quasi-co-located QCL type parameter.

[0152] Various embodiments may preferably implement the following features:

[0153] Preferably, the wireless terminal further includes a processor configured to perform any of the aforementioned wireless communication methods for the wireless terminal.

[0154] This disclosure relates to a wireless network node, including:

[0155] The communication unit is configured as follows:

[0156] Send downlink DL signals to the wireless terminal.

[0157] The DL signal is associated with at least one fourth parameter state, and

[0158] Among them, at least one of the fourth parameter states includes at least one second DL reference signal RS with respect to the first quasi-co-located QCL type parameter.

[0159] Various embodiments may preferably implement the following features:

[0160] Preferably, the wireless network node further includes a processor configured to perform any of the aforementioned wireless communication methods for the wireless network node.

[0161] This disclosure relates to a computer program product including computer-readable program medium code stored thereon, which, when executed by a processor, causes the processor to implement the aforementioned wireless communication method. Attached Figure Description

[0162] The exemplary embodiments disclosed herein relate to features that will become apparent from the following description taken in conjunction with the accompanying drawings. Exemplary systems, methods, apparatuses, and computer program products are disclosed herein according to various embodiments. However, it should be understood that these embodiments are presented by way of example and not limitation, and that various modifications may be apparent to those skilled in the art who have read this disclosure while remaining within the scope of this disclosure.

[0163] Therefore, this disclosure is not limited to the exemplary embodiments and applications described and illustrated herein. Additionally, the specific order and / or hierarchy of steps in the methods disclosed herein are merely exemplary methods. Based on design preferences, the specific order or hierarchy of steps in the disclosed methods or processes may be rearranged while remaining within the scope of this disclosure. Therefore, those skilled in the art will understand that the methods and techniques disclosed herein present various steps or actions in a sample order, and that this disclosure is not limited to the specific order or hierarchy presented, unless otherwise expressly stated.

[0164] The above and other aspects and their embodiments are described in more detail in the accompanying drawings, description and claims.

[0165] Figure 1 An example of a high-speed train scenario is shown.

[0166] Figure 2 An example of a schematic diagram of a wireless terminal according to an embodiment of the present disclosure is shown.

[0167] Figure 3 An example of a schematic diagram of a wireless network node according to an embodiment of the present disclosure is shown.

[0168] Figure 4 An example of Doppler shift caused by high-speed movement of the HST according to an embodiment of the present invention is shown.

[0169] Figure 5 An example of pre-compensating the carrier frequency of DL signals from different TRP / RRHs according to an embodiment of the present disclosure is shown.

[0170] Figure 6 An example of a frequency pre-compensation process in an SFN according to an embodiment of the present disclosure is shown.

[0171] Figure 7 An example of a frequency pre-compensation process in an SFN according to an embodiment of the present disclosure is shown.

[0172] Figure 8 An example of a dynamic TRS configuration for frequency tracking according to an embodiment of this disclosure is shown.

[0173] Figure 9 An example of a time-domain mode configuration having one or more parameter states with one or more time-domain steps is shown according to an embodiment of the present disclosure.

[0174] Figure 10 An example of a time-domain mode configuration of a timestamp according to an embodiment of this disclosure is shown. Detailed Implementation

[0175] Figure 2This is a schematic diagram relating to a wireless terminal 20 according to an embodiment of the present disclosure. The wireless terminal 20 may be a user equipment (UE), mobile phone, laptop, tablet computer, e-book reader, or portable computer system, and is not limited thereto. The wireless terminal 20 may include a processor 200 (such as a microprocessor or application-specific integrated circuit (ASIC)), a storage unit 210, and a communication unit 220. The storage unit 210 may be any data storage device storing program code 212 accessed and executed by the processor 200. Embodiments of the storage unit 212 include, but are not limited to, a subscriber identity module (SIM), read-only memory (ROM), flash memory, random-access memory (RAM), hard disk, and optical data storage devices. The communication unit 220 may be a transceiver and is used to send and receive signals (e.g., messages or packets) according to the processing results of the processor 200. In embodiments, the communication unit 220 communicates via... Figure 2 At least one antenna 222 shown transmits and receives signals.

[0176] In this embodiment, storage unit 210 and program code 212 may be omitted, and processor 200 may include storage unit with the stored program code.

[0177] The processor 200 may implement any of the steps in the exemplary embodiment on the wireless terminal 20, for example by executing program code 212.

[0178] Communication unit 220 may be a transceiver. Alternatively or additionally, communication unit 220 may be combined with a transmitting unit and a receiving unit configured to transmit signals to and receive signals from a wireless network node (e.g., a base station).

[0179] Figure 3This is a schematic diagram relating to a wireless network node 30 according to an embodiment of the present disclosure. The wireless network node 30 may be a satellite, base station (BS), network entity, mobility management entity (MME), serving gateway (S-GW), packet data network (PDN) gateway (P-GW), radio access network (RAN), next-generation RAN (NG-RAN), data network, core network, or radio network controller (RNC), and is not limited thereto. The wireless network node 30 may include a processor 300 such as a microprocessor or ASIC, a storage unit 310, and a communication unit 320. The storage unit 310 may be any data storage device storing program code 312 accessed and executed by the processor 300. Examples of storage units 312 include, but are not limited to, SIM, ROM, flash memory, RAM, hard disk, and optical data storage devices. The communication unit 320 may be a transceiver and is used to send and receive signals (e.g., messages or packets) according to the processing results of the processor 300. In this example, the communication unit 320 communicates via… Figure 3 At least one antenna 322 shown transmits and receives signals.

[0180] In this embodiment, the storage unit 310 and the program code 312 may be omitted. The processor 300 may include a storage unit containing the stored program code.

[0181] The processor 300 can implement any of the steps described in the exemplary embodiments on the wireless network node 30, for example by executing program code 312.

[0182] The communication unit 320 may be a transceiver. Alternatively or additionally, the communication unit 320 may be combined with a transmitting unit and a receiving unit configured to transmit signals to and receive signals from a wireless terminal (e.g., a user equipment).

[0183] In this disclosure, the definition of "parameter state" is equivalent to Quasi-Co-located (QCL) state, Transmission Configuration Indicator (TCI) state, Spatial Relationship (also known as Spatial Relationship Information), Reference Signal (RS), Reference RS, Physical Random Access Channel (PRACH), Spatial Filter, or Precoding.

[0184] Specifically:

[0185] The definition of "parameter status identifier" is equivalent to QCL status index, TCI status index, spatial relationship index, reference signal index, spatial filter index, or precoding index.

[0186] RS includes Channel State Information Reference Signal (CSI-RS), Synchronization Signal Block (SSB) (also known as SS / PBCH), Demodulation Reference Signal (DMRS), Sounding Reference Signal (SRS), or Physical Random Access Channel (PRACH).

[0187] Specifically, the spatial filter can be a spatial filter on the UE side or the gNB side, and the spatial filter is also called a spatial domain filter.

[0188] Note that in this disclosure, "spatial relationship information" consists of one or more reference RSs, which are used to represent the same or quasi-co-located "spatial relationship" between the target "RS or channel" and one or more reference RSs.

[0189] Note that in this disclosure, "spatial relation" means beam, spatial parameter, or spatial domain filter.

[0190] Note that in this disclosure, a “QCL ​​state” consists of one or more reference RSs and their corresponding QCL type parameters, wherein the QCL type parameters include at least one or a combination of the following: [1] Doppler spread, [2] Doppler frequency shift, [3] delay spread, [4] average delay, [5] average gain, and [6] spatial parameters (also referred to as spatial Rx parameters). In this disclosure, a “TCI state” is equivalent to a “QCL ​​state”. In this disclosure, “QCL-TypeA”, “QCL-TypeB”, “QCL-TypeC” and “QCL-TypeD” are defined as follows.

[0191] - "QCL-TypeA": {Doppler frequency shift, Doppler spread, average delay, delay spread}

[0192] - "QCL-TypeB": {Doppler frequency shift, Doppler spread}

[0193] - "QCL-TypeC": {Doppler frequency shift, average delay}

[0194] - "QCL-TypeD": {Space Rx parameter}

[0195] Note that in this disclosure, "UL signal" (i.e., uplink signal) can be uplink physical control channel (PUCCH), uplink physical shared channel (PUSCH), PRACH, or SRS.

[0196] Note that in this disclosure, "DL signal" (i.e., downlink signal) can be downlink physical control channel (PDCCH), downlink physical shared channel (PDSCH), or CSI-RS.

[0197] Note that in this disclosure, “DL RS” (i.e., downlink reference signal) can be DMRS, SSB, SS / PBCH, CSI-RS or CSI-RS for tracking (which is also called tracking RS (TRS)).

[0198] Note that in this disclosure, “UL RS” (i.e., uplink reference signal) can be DMRS, PRACH, or SRS.

[0199] Note that in this disclosure, a “time unit” can be a sub-symbol, symbol, time slot, subframe, frame, or transmission timing.

[0200] Note that in this disclosure, "frequency shift" can be either Doppler frequency shift or Doppler shift.

[0201] Note that in this disclosure, "frequency offset parameter" can be either a Doppler frequency shift offset parameter or a Doppler offset parameter.

[0202] HST speeds can reach up to 350 km / h, and may increase to 500 km / h or higher in the future. Therefore, the Doppler shift introduced by the high-speed movement of HSTs becomes a serious problem for wireless communication performance (e.g., severe inter-carrier interference (ISI)). Figure 4 An example of a Doppler shift introduced by high-speed movement of the HST according to an embodiment of the present invention is shown. Figure 4 In the middle, TRs T0 and T1 (e.g., Figure 1 The RRH0 and RRH1 shown in the diagram both transmit data to the UE with a center frequency f. c The DL signal. Because of the Doppler frequency shift Δf between TRP T0 and UE. DP0 Unlike the Doppler frequency shift Δf between TRP T1 and UE DP1 Therefore, the UE (e.g., the UE's DL receiver) can receive signals with a center frequency f from TRP T0. c +Δf DP0 The DL signal, and receive from TRP T1 with a center frequency f c +Δf DP1 DL signal.

[0203] To eliminate ISI, each of the TRP / RRHs can pre-compensate the center carrier frequency point (which can be simply referred to as the carrier frequency) of its DL signal based on the corresponding Doppler frequency shift, and from the UE's perspective, the carrier frequencies of DL signals from different TRP / RRHs may be the same or consistent after being affected by the Doppler frequency shift in practice. Figure 5 An example of pre-compensating the carrier frequency of DL signals from different TRP / RRHs according to embodiments of this disclosure is shown. Figure 5 In the process, TRP T0 sends a signal with center frequency f to the UE. c -Δf DP0 The DL signal, and TRP T1 sends a signal with center frequency f to the UE. c -Δf DP1 The DL signal. Due to Doppler frequency shift, from the UE's perspective, the carrier frequency of the DL signal received from both TRP T0 and T1 becomes the same / consistent.

[0204] When using TRP to pre-compensate the carrier frequency, some potential issues may need to be discussed. The following examples illustrate these potential problems:

[0205] 1. It may be necessary to consider the reference RS indication used for UL transmission. In order to estimate the Doppler shift corresponding to the TRP / RRH (rather than a mixture of the Doppler shift between the TRP / RRH and the UE and the frequency offset introduced by the UE's local oscillator), a reference RS from the TRP can be indicated so that the carrier frequency of subsequent UL transmissions is consistent with the carrier frequency of the reference RS received by the UE.

[0206] 2. Considering that the HST passes through multiple TRPs / RRHs sequentially, a semi-static or non-periodic tracking RS (TRS, also known as CSI-RS for tracking) may be an option. For example, when the UE approaches a new TRP, the new TRP can activate the corresponding TRS and deactivate the previous TRS accordingly.

[0207] 3. For both the gNB and UE sides, the application and timing of frequency precompensation for DL ​​or UL transmissions should be consistent. If the TRP / RRH and UE follow a unique frequency precompensation for all DL and UL transmissions within a given time period, then the TRS should be UE-specific, not cell-specific. Therefore, from a system perspective, the overall RS overhead can be very large.

[0208] 4. For frequency precompensation, a similar QCL / QCL relationship between the DL and UL signals may need to be considered (including one or more applicable types and associated requirements). As previously mentioned, there may be some gap between the reference RS and the target RS in terms of center frequency, and a corresponding definition of this association between the reference RS and the target RS should be specified.

[0209] In this embodiment, a new framework for frequency precompensation parameter indication and new parameter definition is introduced.

[0210] When the UE receives a DL signal transmitted from the TRP, it determines the frequency shift between the UE and the TRP in the received DL signal based on the Doppler shift and the carrier frequency offset between the UE and the TRP's carrier frequency (also known as the center frequency offset) (e.g., caused by the oscillators of the UE and the TRP). In this case, the UE cannot estimate the Doppler shift separately. To estimate the Doppler shift, the UE can modulate the carrier frequency of the UL signal within a precise range (e.g., ±0.1 PPM observed over a 1 ms time period) compared to the carrier frequency of the DL signal received from the TRP. As a result, when the TRP receives this UL signal, the carrier frequency offset between the center frequencies of the UE and the TRP is removed in the UL signal, and the Doppler shift between the UE and the TRP is doubled. Therefore, the TRP can estimate the Doppler shift between the UE and the TRP based on the carrier frequency offset between the carrier frequency of the received UL signal and the local carrier frequency (e.g., double the Doppler shift).

[0211] In this embodiment, the UL signal may be associated with the DL RS in terms of carrier frequency or Doppler shift. In other words, the UL signal is associated with the DL RS used to measure the carrier frequency or Doppler shift (e.g., for subsequent UL / DL communication). In this embodiment, the UL signal is modulated according to the carrier frequency of the DL RS. For example, the carrier frequency of the UL signal may be modulated according to the carrier frequency of the DL RS. Additionally, the DL RS is received T1 time units before or no later than the command to transmit or schedule the UL signal, where T1 is an integer. Furthermore, at least X1 samples of the DL RS are received before or no later than the command to transmit or schedule the UL signal, where X1 is an integer.

[0212] In this embodiment, the effective time of the DL RS carrier frequency is T2 time units after the event, where the effective time is determined based on a command associated with the DL RS (e.g., activating the DL RS) and a command associated with the parameter state including the first DL RS or X2 samples of the DL RS (e.g., activating it), where T2 and X2 are integers. For example, the effective time of the DL RS carrier frequency is T2 time units after X2 samples of the DL RS, starting 3ms after the transmission of the Hybrid Automatic Repeat Request Acknowledgment (HARQ-ACK) message, which corresponds to the PDSCH carrying the command to activate the DL RS. Furthermore, the command is a MAC-CE command.

[0213] In this embodiment, a previous carrier frequency can be reused before the effective time of T3 time units following the event determined by the command to activate the DL RS or X3 samples of the DL RS, where T3 and X3 are integers. For example, the previous carrier frequency could be the most recently used carrier frequency of the UE, or the most recently used carrier frequency by the UE.

[0214] In an embodiment, when the UE is indicated that the carrier frequency of the UL signal does not refer to any DL RS or to the local carrier frequency or to the DL RS not being configured, the UL signal (e.g., the carrier frequency of the UL signal) can be modulated based on the local carrier frequency or the UE's carrier frequency.

[0215] In the embodiment, the UE observes the carrier frequency of the modulated UL signal within ±0.1 PPM in a 1 ms time period, compared to the carrier frequency of the received DL RS.

[0216] On the one hand, how to determine the DL RS associated with the UL signal is a topic to be discussed.

[0217] In an embodiment, the DL RS associated with the UL signal is determined based on the parameter states applied to the UL signal. For example, the DL RS associated with the UL signal is a reference RS in the parameter states applied to the UL signal, wherein the reference RS is associated with at least one of the carrier frequency or the Doppler shift. In an embodiment, the DL RS is associated with a QCL type parameter that includes at least one of the carrier frequency or the Doppler shift. In an embodiment, the DL RS is associated with QCL-TypeA, QCL-TypeB, or QCL-TypeC.

[0218] In embodiments, the DL RS associated with the UL signal is configured by Radio Resource Control (RRC) signaling or activated by Media Access Control-Effective Control Unit (MAC-CE) command. For example, DL RS is configured or activated for a cell (e.g., RRC signaling configures DL RS for a cell, or MAC-CE command activates DL RS for a cell), where the transmission of the UL signal or carrier frequency determination is based on the DL RS. Furthermore, the definition of "cell" is equivalent to that of a carrier component.

[0219] In the embodiments, for the uplink physical control channel (PUCCH), the DL RS associated with the UL signal is configured in the RRC parameter PUCCH configuration signaling (i.e., PUCCH-Config), or configured for PUCCH resources, PUCCH resource groups, or PUCCH resource sets.

[0220] In this embodiment, for PUSCH, the DL RS associated with the UL signal is configured in the RRC parameter PUSCH configuration signaling (i.e., PUSCH-Config).

[0221] In an embodiment, for SRS, the DL RS associated with the UL signal is configured in the RRC parameter SRS configuration signaling (i.e., SRS-Config), or configured for an SRS resource or SRS resource set.

[0222] In this embodiment, the DL RS associated with the UL signal is a CSI-RS used for tracking, also known as a TRS.

[0223] In this embodiment, parameters related to frequency precompensation can be configured or specified for subsequent DL transmissions from different TRPs.

[0224] In an embodiment, the DL signal for subsequent DL transmissions may be associated with two or more reference parameter states regarding QCL type parameters (e.g., including carrier frequency or Doppler shift). In an embodiment, the two associated reference parameter states include two reference DL RSs regarding QCL type parameters. In an embodiment, the frequency offset parameter between the DL signal and at least one of the reference DL RSs may be configured by RRC signaling or activated by a MAC-CE command. In an embodiment, within the two configured reference DL RSs, the reference DL RS not associated with the (previous) UL signal is ignored regarding QCL type parameters (e.g., including carrier frequency or Doppler shift). In an embodiment, the DL RS associated with the (previous) UL signal is used to determine the QCL type parameters (e.g., including carrier frequency or Doppler shift) for subsequent DL transmissions. In an embodiment, the QCL type parameter may be QCL-TypeA, QCL-TypeB, or QCL-TypeC.

[0225] In an embodiment, the DL signal transmitted subsequently may be associated with only one reference parameter state regarding a QCL type parameter including a Doppler shift. For example, the associated reference parameter state may include a reference DL RS regarding a QCL type parameter including a Doppler shift. In this embodiment, from the UE's perspective, the carrier frequency of signaling (e.g., DL signals) transmitted from another serving TRP (rather than the TRP sending the only reference DL RS regarding a QCL type parameter including a Doppler shift) should be pre-compensated and aligned with the reference DL RS. In an embodiment, the DL signal may be associated with a new QCL type parameter that includes Doppler spread but not a Doppler shift (e.g., QCL type: {Doppler spread}). In an embodiment, the new QCL type parameter may also include at least one of average delay or delay spread. For example, the new QCL type parameter may be a QCL type representing one of {Doppler spread}, {Doppler spread, average delay}, {Doppler spread, average spread}, or {Doppler spread, average delay, delay spread}. In this embodiment, the DL signal is associated with parameter states that include two reference DL RSs for Doppler spread, but only one reference DL RS for Doppler shift. In this embodiment, the Doppler shift can be determined based on the single reference DL RS for Doppler shift, and the Doppler spread can be determined based on both of the two reference DL RSs for Doppler spread.

[0226] Figure 6 An example of a frequency pre-compensation process in an SFN according to an embodiment of this disclosure is shown. Figure 6 In this context, there exist two TRPs, T0 and T1, serving the UE in the SFN (e.g., Figure 1 The diagram shows RRH (RRH0 and RRH1), where the carrier frequencies of TRP (T0 and T1) are both frequencies f. c Note that TRP T0 and T1 have different local frequency offsets (also known as carrier frequency errors). In this embodiment, the frequency offset Δf OC_T0_T1 This represents the carrier frequency offset between the local frequency offsets of TRP T0 and T1. Additionally, the frequency offset Δf OC_T0_UE This represents the carrier frequency difference Δf between the carrier frequencies of TRP T0 and the UE. OC_T1_UE The frequency offset Δf represents the carrier frequency difference between TRP T1 and the UE's carrier frequency. DP0 This represents the Doppler frequency shift from TRP T0 to UE, and the frequency offset Δf. DP1 This indicates the Doppler frequency shift from TRP T1 to UE.

[0227] exist Figure 6 In the process, TRP T0 sends reference DL RS RS0 to the UE, and from the UE's perspective, the carrier frequency of reference DL RS RS0 (e.g., the carrier frequency of reference DL RS RS0 received by the UE) can be expressed as:

[0228] f c +Δf DP0 +Δf OC_T0_UE

[0229] Similarly, TRP T1 sends reference DL RS RS1 to the UE, and from the UE's perspective, the carrier frequency of reference DL RS RS1 (e.g., the carrier frequency of reference DL RS RS1 received by the UE) can be expressed as:

[0230] f c +Δf DP1 +Δf OC_T1_UE

[0231] Next, the UE sends the UL signal ULS0 (e.g., PUSCH or SRS) to both TRP T0 and T1. Note that the UL signal ULS0 utilizes the carrier frequency of DL RS RS0 (i.e., f c +Δf DP0 +Δf OC_T0_UE Modulation is performed.

[0232] From the perspective of TRP T0, this is due to the frequency offset Δf between the carrier frequencies of the UE and TRP T0. OC_T0_UE Since it was revoked, the carrier frequency of the UL signal ULS0 becomes f. c +2Δf DP0 Under these conditions, TRP T0 can estimate the frequency shift Δf. DP0 .

[0233] From the perspective of TRP T1, the carrier frequency of the UL signal ULS0 is f. c +Δf DP0 +Δf DP1 +Δf OC_T0_T1 In this embodiment, the frequency offset Δf DP0 and Δf OC_T0_T1 This is known in TRP T1 because TRP T1 can be indicated (e.g., configured) for the frequency offset Δf estimated in TRP T0. DP0 Furthermore, the frequency offset Δf can be estimated by tracking the TRS of TRP T1. OC_T0_T1 (Or TRP T0 and T1 are synchronized via a dedicated optical fiber). Therefore, the frequency offset Δf can be estimated accordingly. DP1 .

[0234] The UE also sends a UL signal ULS1 (e.g., PRACH or SRS) to both TRP T0 and T1, where the UL signal ULS1 utilizes a local carrier frequency (e.g., the carrier frequency f of TRP T0). c Modulation is performed.

[0235] From the perspective of TRP T0, the carrier frequency of the UL signal ULS1 is f. c +Δf DP0 +Δf OC_T0_UE Because the frequency offset Δf is estimated based on the UL signal ULS0. DP0 Therefore, for example, the frequency offset Δf can be estimated using TRP T0. OC_T0_UE .

[0236] From the perspective of TRP T1, the carrier frequency of the UL signal ULS1 is f. c +Δf DP1 +Δf OC_T1_UE Because the frequency offset Δf is estimated based on the UL signal ULS0. DP1 Therefore, for example, the frequency offset Δf can be estimated using TRP T1. OC_T1_UE .

[0237] Based on the estimated frequency offset Δf DP0 , Δf DP1 , Δf OC_T0_UE and Δf OC_T1_UE DL communication (e.g., DL signal DLS) from TRP T0 and T1 can be pre-compensated. In an embodiment, the DL signal is PDSCH. In the example, the carrier frequency of the DL signal DLS from TRP T0 is pre-compensated to f. c -Δf DP0 -Δf OC_T0_UE Furthermore, the carrier frequency of the DL signal DLS from TRP T1 is pre-compensated to f. c -Δf DP1 -Δf OC_T1_UE Through pre-compensation, the DL transmission from TRP T0 and T1 is synchronized with the UE's local carrier frequency (i.e., carrier frequency f). c This is consistent with the results. For example, when a UE receives a DL signal (DLS) in an SFN, inter-carrier interference caused by different Doppler frequency shifts can be eliminated. Furthermore, regarding Doppler frequency shifts, the DMRS transmitted by the DL can be quasi-co-located with both reference DLRSs RS0 and RS1.

[0238] Figure 7 An example of a frequency pre-compensation process in an SFN according to an embodiment of the present disclosure is shown. Figure 7 The embodiments shown can be similar to Figure 6 The embodiments shown herein therefore use the same symbols for signals and components with similar functions. Figure 7 In this context, there exist two TRPs, T0 and T1, serving the UE in the SFN (e.g., Figure 1 The diagram shows RRH (RRH0 and RRH1), where the carrier frequencies of TRP (T0 and T1) are both frequencies f. c Note that TRP T0 and T1 have different local frequency offsets. In this embodiment, the frequency offset Δf OC_T0_T1 This represents the carrier frequency offset between the local frequency offsets of TRP T0 and T1. Additionally, the frequency offset Δf OC_T0_UE This represents the carrier frequency difference Δf between the carrier frequencies of TRP T0 and the UE. OC_T1_UE The frequency offset Δf represents the carrier frequency difference between TRP T1 and the UE's carrier frequency. DP0 This represents the Doppler frequency shift from TRP T0 to UE, and the frequency offset Δf. DP1 This indicates the Doppler frequency shift from TRP T1 to UE.

[0239] exist Figure 7 In the process, TRP T0 sends reference DL RS RS0 to the UE, and from the UE's perspective, the carrier frequency of reference DL RS RS0 (e.g., the carrier frequency of reference DL RS RS0 received by the UE) can be expressed as:

[0240] f c +Δf DP0 +Δf OC_T0_UE

[0241] Note, for example, regarding Doppler shift, TRP T1 does not send a reference DL RS to the UE.

[0242] Next, the UE sends the UL signal ULS0 (e.g., PUSCH or SRS) to both TRP T0 and T1. Note that the UL signal ULS0 utilizes the carrier frequency of DL RS RS0 (i.e., f c +Δf DP0 +Δf OC_T0_UE Modulation is performed.

[0243] From the perspective of TRP T0, this is due to the frequency offset Δf between the carrier frequencies of the UE and TRP T0. OC_T0_UE Since it was revoked, the carrier frequency of the UL signal ULS0 becomes f. c +2Δf DP0 Under these conditions, TRP T0 can estimate the frequency shift Δf. DP0 .

[0244] From the perspective of TRP T1, the carrier frequency of the UL signal ULS0 is f. c +Δf DP0 +Δf DP1 +Δf OC_T0_T1 In this embodiment, the frequency offset Δf DP0 and Δf OC_T0_T1 This is known in TRP T1, for example, because TRP T1 can be used to indicate the frequency offset Δf estimated in TRP T0. DP0 Furthermore, the frequency offset Δf can be estimated by tracking the TRS of TRP T1. OC_T0_T1 (Or TRP T0 and T1 are synchronized via a dedicated optical fiber). Therefore, the frequency offset Δf can be estimated accordingly. DP1 .

[0245] exist Figure 7 In the embodiment shown, the UE no longer sends a UL signal modulated using the local carrier frequency to both TRP T0 and T1 (e.g., Figure 6 The UL signal ULS1 is shown in the image.

[0246] exist Figure 7 In this process, DL communication (e.g., DL signal DLS) from TRP T0 is not pre-compensated. That is, TRP T0 sends DLSf to the UE using frequency DLSf. c The modulated DL signal. Furthermore, the DL communication from TRP T1 (e.g., the DL signal DLS) is offset by an estimated frequency shift Δf. DP0 , Δf DP1 and Δf OC_T0_T1 Pre-compensated. In this embodiment, the DL signal is PDSCH. In this embodiment, the carrier frequency of the DL signal DLS from TRP T1 is pre-compensated to f. c +Δf DP0 -Δf DP1 +Δf OC_T0_T1 Through pre-compensation, from the UE's perspective, the DL transmissions from TRP T0 and T1 are consistent with the carrier frequency. As a result, for example, when the UE receives the DL signal DLS in the SFN, inter-carrier interference caused by different Doppler frequency shifts can also be eliminated. Moreover, regarding Doppler frequency shift, the DMRS of the DL transmission can be quasi-co-located with the reference DL RS RS0.

[0247] To enable non-cell-level mobility / handover when the UE passes through the SFN, the TRS configuration used for frequency tracking may need to be updated frequently, for example, from Figure 1The diagram shows RRH RRH0 to RRH RRH1. The number of TRS that a UE needs to monitor or track within a given time period is limited. However, from the perspective of an SFN system, the total number of TRS can be large because there may be sufficient TRP / RRH. Therefore, for an SFN system, a dynamic TRS configuration for frequency tracking can be considered.

[0248] In this embodiment, the TRS can be configured with a physical cell index and a reference RS regarding QCL type parameters via RRC signaling or MAC-CE commands.

[0249] In this embodiment, the physical cell index can be used to indicate neighboring cells of the TRS, and the reference RS in the neighboring cells is assumed to be the reference RS of the TRS with respect to the QCL type parameters. In this embodiment, the QCL type parameters can be Doppler frequency shift or spatial parameters. In this embodiment, the reference RS is the SSB.

[0250] In an embodiment, the TRS may be configured with parameter states, which include a physical cell index and a reference RS regarding QCL type parameters.

[0251] In this embodiment, the TRS can be semi-static, and the semi-static TRS can be activated using parameter state PS_A via a MAC-CE command. In this embodiment, another parameter state PS_B, including the semi-static TRS, is activated via parameter state PS_A, and the parameter state PS_B of the semi-static TRS (e.g., QCL assumption) is determined based on parameter state PS_A, or state PS_A is applied to the TRS. In this embodiment, parameter state PS_B can be indicated or activated for PDCCH or PDSCH transmissions.

[0252] In this embodiment, the TRS can be aperiodic. In this embodiment, the aperiodic TRS can be activated by the MAC-CE using parameter states.

[0253] In an embodiment, the parameter state of TRS is determined based on at least one of the following.

[0254] 1. A HARQ-ACK message corresponding to the PDSCH that carries the MAC-CE command used to activate the TRS parameter status;

[0255] 2. The timing of TRS transmission; and

[0256] 3. For example, DCI is triggered when TRS is aperiodic.

[0257] Figure 8 An example of a dynamic TRS configuration for frequency tracking according to embodiments of this disclosure is shown. Figure 8In this configuration, multiple parameter states (e.g., one or more TCI states) are configured by RRC signaling, some of which are configured with a TRS as a reference RS regarding QCL type parameters (e.g., Figure 8 (The hollow circles shown in the image), and some of them are not configured with TRS (e.g., Figure 8 (The circle with horizontal stripes shown in the image). In addition, multiple PCIs (e.g., Figure 8 The circle with vertical stripes shown is configured as a pool. In this embodiment, the TRS is not configured with parameter states.

[0258] exist Figure 8 In this context, at least one of the parameter states with a TRS is activated by a corresponding reference parameter state (e.g., one of the parameter states without a TRS) and a corresponding PCI. In other words, at least one parameter state of a TRS (e.g., at least one QCL hypothesis) is determined (e.g., associated with) based on the corresponding reference parameter state and the corresponding PCI.

[0259] exist Figure 8 In this embodiment, at least one of the at least one active parameter state is indicated for PDSCH transmission. For example, at least one of the at least one active parameter state can be selected for application to PDSCH transmission.

[0260] In an embodiment, Doppler frequency shift can be eliminated by using a frequency pre-compensation method. In an embodiment, one or more reference RS and target signals (e.g., reference DL RS RS0 and signals from...) Figure 6 The carrier frequency of the DL signal (DLS) of TRP T0 shown in Figure 7 may be different. In embodiments, a frequency offset configuration between the reference RS and the target signal can be performed, and the UE can further compensate for the frequency offset of the target signal when the target signal is received (e.g., demodulated). In embodiments employing a frequency offset configuration between the reference RS (without frequency pre-compensation) and the DL transmission (e.g., PDSCH transmission, or DMRS of PDSCH transmission) (with frequency compensation), a cell-specific TRS can be enabled in the SFN instead of a UE-specific TRS.

[0261] In this embodiment, the frequency offset parameter of the reference RS can be associated with the parameter state, for example, via RRC signaling or MAC-CE command. In this embodiment, the reference RS can be a corresponding RS with respect to at least the Doppler shift or a specific RS in the parameter state. In an embodiment applied to the parameter state of the target signal, the carrier frequency or Doppler shift of the target signal is determined based on the reference RS and the frequency offset parameter. Note that in this embodiment, the frequency offset parameter is directly configured with / associated with the parameter state.

[0262] In this embodiment, frequency offset parameters are configured or activated for a reference RS via RRC signaling or MAC-CE commands. In this embodiment, the frequency offset parameters are applied to the transmission of the target signal when the transmission of the target signal is determined based on the reference RS for which the frequency offset parameters are configured or activated. In this embodiment, the frequency offset parameters are not directly configured with a parameter state or associated with a parameter state.

[0263] In embodiments where the target signal is a DL signal, for example, the UE can receive the DL signal based on the sum of the carrier frequency of the reference RS and a configured frequency offset (e.g., indicated by a frequency offset parameter). For example, a PDSCH transmission utilizes parameter states including the TRS with respect to the Doppler shift and the configured frequency offset (parameter) for indication. On the UE side, the frequency estimate of the TRS is 1.001 GHz, and the configured frequency offset is -0.002 GHz. Therefore, the UE assumes that the carrier frequency used for the PDSCH transmission is 0.999 GHz, which is used for one or more subsequent demodulations.

[0264] In embodiments where the target signal is a UL signal, the UL signal can be modulated using a carrier frequency determined based on the carrier frequency of a reference RS and a configured frequency offset (e.g., indicated by a frequency offset parameter). For example, an SRS transmission is indicated using a parameter state that includes a TRS as a reference RS for frequency pre-compensation and a configured frequency offset (parameter). On the UE side, the carrier frequency estimated for the TRS is 1.000 GHz, and the configured frequency offset is -0.002 GHz. In this case, the carrier frequency modulated for the SRS transmission could be 0.998 GHz. In this embodiment, the error in the actual carrier frequency used for the SRS transmission may need to be within a certain range.

[0265] In an embodiment, the target signal may be a DL RS, a DL data channel (e.g., PDSCH), and / or a DL control channel (e.g., PDCCH).

[0266] In an embodiment, the target signal may be a UL RS, a UL data channel (e.g., PUSCH), and / or a UL control channel (e.g., PUCCH).

[0267] In HST scenarios, the movement path and speed of the UE (UE in HST) can be stable. Therefore, a frequency offset parameter and / or reference RS with respect to at least one of the Doppler frequency shift or carrier frequency can be predetermined. That is, the time-domain mode of the frequency offset parameter and / or reference RS can be configured to reduce signaling overhead and improve transmission performance by utilizing continuous time-domain pre-compensation.

[0268] In an embodiment, a set of frequency offset parameters, one or more parameter states, and / or one or more reference RSs are configured, and one of the set of frequency offset parameters, one or more parameter states, and / or reference RSs is associated with a timestamp and / or a time-domain step size. In an embodiment, the step size between two adjacent timestamps can be configurable or predefined (e.g., 10 ms). In an embodiment, the start point of the timestamp is determined according to at least one of the following:

[0269] 1. HARQ-ACK message for PDSCH corresponding to the MAC-CE command that carries the activation configuration (e.g., the activation associated parameter state);

[0270] 2. The PDSCH carrying the MAC-CE command that activates the configuration (e.g., the associated parameter state); and

[0271] 3. Trigger the DCI command with the frequency offset parameter or reference RS configuration.

[0272] In this embodiment, the timestamp is configurable. In other words, the offset from the HARQ-ACK of receiving or transmitting the corresponding command to the time point using pre-configured frequency offset parameters, parameter states, and / or pre-configured reference RS can be configured.

[0273] Figure 9 An example of a time-domain mode configuration having one or more parameter states with one or more time-domain steps is shown according to an embodiment of the present disclosure, wherein one or more parameter states (e.g., parameter states PS1, PS2, and PS4) include one or more reference RSs with respect to at least one of Doppler shift or carrier frequency. Figure 9 In this configuration, the time-domain step size is explicitly configured to 10ms, and the parameter states PS1, PS2, and PS4 are applied to PDSCH transmissions starting from 0ms, 10ms, 20ms, and 30ms, respectively.

[0274] Figure 10 An example of a time-domain mode configuration of a timestamp according to an embodiment of the present disclosure is shown, wherein one or more parameter states (e.g., parameter states PS1, PS2, and PS4) include one or more reference RSs with respect to at least one of Doppler shift or carrier frequency. Figure 10 In this configuration, each parameter state is configured with one or more timestamps. For example, parameter state PS1, which includes TRS-1, is applied to PDSCH transmissions starting from a timestamp of 0ms; parameter state PS2, which includes TRS-6, is applied to PDSCH transmissions starting from a timestamp of 20ms; and parameter state PS4, which includes TRS-8, is applied to PDSCH transmissions starting from a timestamp of 30ms.

[0275] While various embodiments of this disclosure have been described above, it should be understood that they are presented merely as examples and not as limitations. Similarly, various figures may depict exemplary architectures or configurations, provided to enable those skilled in the art to understand the exemplary features and functionality of this disclosure. However, such a person will understand that this disclosure is not limited to the exemplary architectures or configurations shown, but can be implemented using various alternative architectures and configurations. Additionally, as will be understood by those skilled in the art, one or more features of one embodiment may be combined with one or more features of another embodiment described herein. Therefore, the breadth and scope of this disclosure should not be limited by any of the exemplary embodiments described above.

[0276] It should also be understood that any reference to elements in this document using designations such as "first," "second," etc., generally does not restrict the number or order of these elements. Rather, these designations may be used herein as a convenient means of distinguishing two or more elements or instances of elements. Therefore, a reference to the first element and the second element does not imply that only two elements can be used, or that the first element must somehow precede the second element.

[0277] Additionally, those skilled in the art will understand that information and signals can be represented using any of a variety of different techniques and processes. For example, data, instructions, commands, information, signals, bits, and symbols (as may be referenced in the description above) can be represented by voltage, current, electromagnetic waves, magnetic fields or particles, light fields or particles, or any combination thereof.

[0278] Those skilled in the art will further understand that any of the various illustrative logic blocks, units, processors, devices, circuits, methods, and functions described in conjunction with the aspects disclosed herein may be implemented by electronic hardware (e.g., digital implementation, analog implementation, or a combination of both), firmware, various forms of program or design code incorporating instructions (which may be referred to herein as "software" or "software unit"), or any combination of these techniques.

[0279] To clearly illustrate this interchangeability of hardware, firmware, and software, various illustrative components, blocks, units, circuits, and steps have been described above in general terms of their functionality. Whether this functionality is implemented as hardware, firmware, software, or a combination of these technologies depends on the specific application and design constraints imposed on the system as a whole. Skilled artisans can implement the described functionality in various ways for each specific application, but such implementation decisions do not depart from the scope of this disclosure. According to various embodiments, processors, devices, components, circuits, structures, machines, units, etc., can be configured to perform one or more of the functions described herein. The terms “configured to” or “configured for” as used herein with respect to a particular operation or function refer to processors, devices, components, circuits, structures, machines, units, etc., that are physically constructed, programmed, and / or arranged to perform the specified operation or function.

[0280] Furthermore, those skilled in the art will understand that the various illustrative logic blocks, units, devices, components, and circuits described herein can be implemented within or executed by an integrated circuit (IC), which may include a general-purpose processor, a digital signal processor (DSP), an application-specific integrated circuit (ASIC), a field-programmable gate array (FPGA), or other programmable logic devices, or any combination thereof. Logic blocks, units, and circuits may further include antennas and / or transceivers for communication with various components within a network or device. A general-purpose processor may be a microprocessor, but alternatively, the processor may be any conventional processor, controller, or state machine. The processor may also be implemented as a combination of computing devices, such as a combination of a DSP and a microprocessor, a combination of multiple microprocessors, a combination of one or more microprocessors with a digital signal processor core, or any other suitable configuration to perform the functions described herein. If implemented in software, the functions may be stored as one or more instructions or code on a computer-readable medium. Therefore, the steps of the methods or algorithms disclosed herein can be implemented as software stored on a computer-readable medium.

[0281] Computer-readable media include both computer storage media and communication media, with the latter including any medium that can be enabled to transfer computer programs or code from one place to another. Storage media can be any available medium that is accessible to a computer. By way of example, and not limitation, such computer-readable media may include RAM, ROM, EEPROM, CD-ROM or other optical disc storage devices, magnetic disk storage devices or other magnetic storage devices, or any other medium that can be used to store desired program code in the form of instructions or data structures and that is accessible to a computer.

[0282] In this document, as used herein, the term "unit" refers to software, firmware, hardware, and any combination of such elements for performing the associated functions described herein. Additionally, for the purposes of discussion, various units are described as discrete modules; however, as will be apparent to those skilled in the art, according to embodiments of this disclosure, two or more units may be combined to form a single unit performing associated functions.

[0283] Additionally, in embodiments of this disclosure, memory or other storage devices and communication components may be employed. It should be understood that, for clarity, embodiments of this disclosure have been described above with reference to different functional units and processors. However, it will be apparent that any suitable functional distribution among different functional units, processing logic elements, or domains may be used without departing from this disclosure. For example, functions shown to be performed by separate processing logic elements or controllers may be performed by the same processing logic element or controller. Therefore, references to specific functional units are merely references to suitable means for providing the described functionality and do not indicate a strict logical or physical structure or organization.

[0284] Various modifications to the embodiments described in this disclosure will be apparent to those skilled in the art, and the general principles defined herein can be applied to other embodiments without departing from the scope of this disclosure. Therefore, this disclosure is not intended to be limited to the embodiments shown herein, but is accorded the widest scope consistent with the novel features and principles disclosed herein, as set forth in the foregoing claims.

Claims

1. A wireless communication method for use in a wireless terminal, applied in a single-frequency network scenario containing multiple switching points (TRPs), comprising: One or more uplink UL signals are transmitted so that the plurality of TRPs can estimate the frequency offset based on the one or more UL signals. The estimated frequency offset is used to perform frequency pre-compensation on the downlink signals transmitted to the wireless terminal. Wherein, the first UL signal in one or more UL signals is modulated using the carrier frequency of the first downlink DL reference signal RS to enable the plurality of TRPs to estimate the Doppler frequency shift, wherein the carrier frequency of the first DL RS is determined based on events associated with the first UL signal and the first downlink DL reference signal RS. The second UL signal in one or more UL signals is modulated using a local carrier frequency or the carrier frequency of a wireless terminal to enable the plurality of TRPs to estimate the carrier frequency offset. The local carrier frequency or the carrier frequency of the wireless terminal is determined based on an event indicated as one of the following: the carrier frequency of the second UL signal does not refer to the first DL RS, the carrier frequency of the second UL signal refers to the local carrier frequency, or the first DL RS is not configured.

2. The wireless communication method of claim 1, wherein the carrier frequency of the first DL RS is applied according to an effective time, the effective time being determined based on a command associated with the first DL RS, a command associated with a parameter state including the first DL RS, or at least one sample of the first DL RS.

3. The wireless communication method according to claim 1, wherein the first DL RS is determined based on a first parameter state applied to the first UL signal.

4. The wireless communication method according to claim 3, wherein the first DL RS is a reference RS in the first parameter state and is associated with at least one of carrier frequency or Doppler shift.

5. The wireless communication method according to any one of claims 1-4, wherein the first DL RS is configured with a physical cell index and a reference RS regarding QCL type parameters.

6. The wireless communication method according to any one of claims 1-4, wherein the parameter state of the first DL RS is activated by a third parameter state, the third parameter state including a reference RS with respect to QCL type parameters.

7. The wireless communication method according to claim 6, wherein the QCL assumption of the first DLRS is determined according to the third parameter state, or the third parameter state is applied to the first DLRS.

8. The wireless communication method according to claim 6, wherein the parameter state including the first DL RS is activated for the downlink physical control channel PDCCH, downlink physical shared channel PDSCH, uplink physical control channel PUCCH or uplink physical shared channel PUSCH.

9. The wireless communication method according to claim 7 or 8, wherein the parameter state of the first DL RS is determined based on at least one of the following: This corresponds to the HARQ-Ack message of the PDSCH that carries the parameter state of the MAC-CE, including the activation of the first DL RS. RS transmission timing, or The DL control information that triggers the transmission of the first DL RS.

10. A wireless communication method for use in a wireless network node, applied in a single-frequency network scenario containing multiple transfer points (TRPs), comprising: Send the first downlink DL reference signal RS to the wireless terminal; One or more uplink UL signals are received from the wireless terminal to estimate the frequency offset based on the one or more UL signals. The estimated frequency offset is used to perform frequency pre-compensation on the downlink signals transmitted to the wireless terminal. Wherein, the first UL signal in one or more UL signals is modulated using the carrier frequency of a first downlink DL reference signal RS to enable the plurality of TRPs to estimate the Doppler frequency shift, wherein the carrier frequency of the first DL RS is determined based on events associated with the first UL signal and the first DL RS. The second UL signal in one or more UL signals is modulated using a local carrier frequency or the carrier frequency of a wireless terminal to enable the plurality of TRPs to estimate the carrier frequency offset. The local carrier frequency or the carrier frequency of the wireless terminal is determined based on an event indicated as one of the following: the carrier frequency of the second UL signal does not refer to the first DL RS, the carrier frequency of the second UL signal refers to the local carrier frequency, or the first DL RS is not configured.

11. The wireless communication method of claim 10, wherein the carrier frequency of the first DL RS is applied according to an effective time, the effective time being determined based on a command associated with the first DL RS, a command associated with a parameter state including the first DL RS, or at least one sample of the first DL RS.

12. The wireless communication method of claim 10, wherein the first DL RS is determined based on a first parameter state applied to the first UL signal.

13. The wireless communication method of claim 12, wherein the first DL RS is a reference RS in the first parameter state and is associated with at least one of carrier frequency or Doppler shift.

14. The wireless communication method according to any one of claims 10-13, wherein the first DL RS is configured with a physical cell index and a reference RS regarding QCL type parameters.

15. The wireless communication method according to any one of claims 10-13, wherein the first DL RS is configured with a second parameter state, and wherein the second parameter state includes a physical cell index and a reference RS regarding QCL type parameters.

16. The wireless communication method according to any one of claims 10-13, wherein the parameter state of the first DL RS is activated by a third parameter state, the third parameter state including a reference RS with respect to QCL type parameters.

17. The wireless communication method of claim 16, wherein the QCL assumption of the first DL RS is determined according to the third parameter state, or the third parameter state is applied to the first DL RS.

18. The wireless communication method according to claim 16, wherein the parameter state including the first DLRS is activated for the downlink physical control channel PDCCH, downlink physical shared channel PDSCH, uplink physical control channel PUCCH, or uplink physical shared channel PUSCH.

19. The wireless communication method according to claim 17 or 18, wherein the parameter state of the first DL RS is determined based on at least one of the following: This corresponds to the hybrid automatic repeat request acknowledgment (HARQ-Ack) message of the PDSCH that carries the parameter state of the MAC-CE, including the activation of the first DL RS. RS transmission timing, or The DL control information that triggers the transmission of the first DL RS.

20. A wireless terminal, applied in a single-frequency network scenario including multiple conversion points (TRPs), comprising a processor and a storage unit, wherein the processor is configured to execute program code in the storage unit to perform the following operations: One or more uplink UL signals are transmitted so that the plurality of TRPs can estimate the frequency offset based on the one or more UL signals. The estimated frequency offset is used to perform frequency pre-compensation on the downlink signals transmitted to the wireless terminal. in, The first UL signal, one of the one or more UL signals, is modulated using the carrier frequency of a first downlink DL reference signal RS and used to estimate the Doppler frequency shift. The carrier frequency of the first DL RS is determined based on events associated with the first UL signal and the first downlink DL reference signal RS. The second UL signal in the one or more UL signals is modulated using a local carrier frequency or the carrier frequency of the wireless terminal and used to estimate the carrier frequency offset. The local carrier frequency or the carrier frequency of the wireless terminal is determined based on an event indicated as one of the following: the carrier frequency of the second UL signal does not refer to the first DLRS, the carrier frequency of the second UL signal refers to the local carrier frequency, or the first DLRS is not configured.

21. A wireless terminal, comprising a processor and a storage unit, the processor being configured to execute program code in the storage unit to implement the wireless communication method of any one of claims 2 to 9.

22. A wireless network node, applied in a single-frequency network scenario including multiple transfer points (TRPs), comprising a processor and a storage unit, the processor being configured to execute program code in the storage unit to perform the following operations: Send the first downlink DL reference signal RS to the wireless terminal, and One or more uplink UL signals are received from the wireless terminal to estimate the frequency offset based on the one or more UL signals. The estimated frequency offset is used to perform frequency pre-compensation on the downlink signals transmitted to the wireless terminal. in, The first UL signal, one of the one or more UL signals, is modulated using the carrier frequency of a first downlink DL reference signal RS and used to estimate the Doppler frequency shift. The carrier frequency of the first DL RS is determined based on events associated with the first UL signal and the first DL RS. The second UL signal in the one or more UL signals is modulated using a local carrier frequency or the carrier frequency of the wireless terminal and used to estimate the carrier frequency offset. The local carrier frequency or the carrier frequency of the wireless terminal is determined based on an event indicated as one of the following: the carrier frequency of the second UL signal does not refer to the first DLRS, the carrier frequency of the second UL signal refers to the local carrier frequency, or the first DLRS is not configured.

23. A wireless network node comprising a processor and a storage unit, the processor being configured to execute program code in the storage unit to implement the wireless communication method of any one of claims 11 to 19.

24. A computer program product comprising computer-readable program medium code stored thereon, the code causing the processor, when executed by a processor, to perform the method of any one of claims 1 to 19.

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