Method and apparatus for wireless communication

Abstract

The present application provides a method and apparatus for wireless communication, which solves the problem that a communication system with large propagation delay and high device mobility, such as NTN, cannot meet the phase continuity requirement when performing channel estimation based on DMRS bundling due to a phase offset. The method includes a step of determining, by a terminal device, a plurality of frequency compensation segments within a first time period based on first information, the first information being related to DMRS bundling for joint channel estimation, the first time period including a time-domain window corresponding to at least one of the DMRS bundlings, and the terminal device pre-compensating for an uplink channel corresponding to the first time period based on the plurality of frequency compensation segments.

Description

[Technical Field]

[0001] This application claims priority to a Chinese patent application bearing application number 2023102248123 and entitled "Method and Apparatus for Wireless Communication," filed with the China Patent Office on March 10, 2023, the entire contents of which are incorporated herein by reference.

[0002] TECHNICAL FIELD This application relates to the field of communications, and more particularly to methods and apparatus for wireless communications. [Background technology]

[0003] Some communication systems (e.g., non-terrestrial network (NTN) systems) are characterized by large propagation delays and strong device mobility. In such communication systems, when devices perform joint channel estimation based on demodulation reference signal (DMRS) bundling, phase continuity within a specified time-domain window may not be ensured. For example, in NTN systems, satellite movement may result in rapid changes in Doppler shift and time delay, so DMRS bundling corresponds to a relatively large phase offset within the time-domain window. Summary of the Invention [Problem to be solved by the invention]

[0004] The present application provides a method and apparatus for wireless communication. Hereinafter, various aspects according to embodiments of the present application will be described. [Means for solving the problem]

[0005] In a first aspect, a method for wireless communication is provided, the method including: a step in which a terminal device determines a plurality of frequency compensation segments within a first time period based on first information, the first information being related to DMRS bundling for joint channel estimation, the first time period including a time domain window corresponding to at least one of the DMRS bundlings; and a step in which the terminal device performs pre-compensation on an uplink channel corresponding to the first time period based on the plurality of frequency compensation segments.

[0006] In some embodiments, the first information is used to determine one or more of the following: a time-domain location of the first time period; an event that disrupts phase continuity within the first time period; an A-TDW within the first time period; and a C-TDW within the first time period.

[0007] In some embodiments, the event that disrupts phase continuity within the first time period comprises updating a TA, the TA comprising a common TA and / or a TA corresponding to the terminal device.

[0008] In some embodiments, the plurality of frequency compensation segments are determined based on the A-TDW and / or the C-TDW within the first time period, and the magnitude of the A-TDW and the magnitude of the C-TDW are dynamically adjusted based on the moving speed and / or antenna switching of satellites in the NTN system.

[0009] In some embodiments, the time domain window corresponding to the DMRS bundling is determined based on the relative position of the terminal device and a satellite in the NTN system.

[0010] In some embodiments, the relative position of the satellite and the terminal device includes an elevation angle of the terminal device with respect to the satellite, and the duration T of the time domain window corresponding to the DMRS bundling satisfies the condition T=K×θ, where θ represents the elevation angle, K represents a proportionality coefficient, and K>0.

[0011] In some embodiments, the first time period includes a plurality of the DMRS bundlings, and each frequency compensation segment in the plurality of frequency compensation segments corresponds to one or more of the DMRS bundlings, respectively.

[0012] In some embodiments, the first information is further used to indicate boundaries of the plurality of frequency compensation segments, and the method further includes a step of the terminal device determining whether to update a TA based on the boundaries of the plurality of frequency compensation segments.

[0013] In some embodiments, the plurality of frequency compensation segments includes a first frequency compensation segment, and before the terminal device performs pre-compensation on an uplink channel corresponding to the first time period based on the plurality of frequency compensation segments, the method further includes a step in which the terminal device determines a first compensation value corresponding to the first frequency compensation segment, the first compensation value being related to a frequency offset within the first frequency compensation segment.

[0014] In some embodiments, the first compensation value is determined based on one or more of the following information: a time domain position of the first frequency compensation segment within the first time period; a downlink channel received by the terminal device prior to the first time period; one or more DMRS symbols of a first time domain unit within the first frequency compensation segment; a second compensation value corresponding to a second frequency compensation segment preceding the first frequency compensation segment; and an adjustment factor related to phase continuity of the first frequency compensation segment.

[0015] In some embodiments, the first frequency compensation segment is a first frequency compensation segment within the first time period, the first compensation value is determined based on a downlink channel received by the terminal device before the first time period, and all time domain units in the first frequency compensation segment perform the pre-compensation based on the first compensation value.

[0016] In some embodiments, the first frequency compensation segment is a frequency compensation segment other than a first frequency compensation segment within the first time period, the first compensation value is determined based on a second compensation value corresponding to a second frequency compensation segment preceding the first frequency compensation segment, and all time domain units in the first frequency compensation segment perform the pre-compensation based on the first compensation value.

[0017] In some embodiments, the first compensation value is determined based on one or more DMRS symbols of a first time domain unit in the first frequency compensation segment, and time domain units other than the first time domain unit in the first frequency compensation segment perform the pre-compensation based on the first compensation value.

[0018] In some embodiments, the first compensation value is determined based on an adjustment factor related to phase continuity of the first frequency compensation segment, the adjustment factor related to the first frequency compensation segment and the position of the first frequency compensation segment within the first time period.

[0019] In some embodiments, the first time period includes M first frequency compensation segments, and a compensation value of an i-th first frequency compensation segment among the M first frequency compensation segments is

number

number

[0020] In some embodiments, the frequency offset is related to a phase offset corresponding to the first frequency compensation segment, and the phase offset is determined based on one or more of a Doppler shift due to relative motion between the terminal equipment and network equipment and a time drift associated with the terminal equipment and network equipment.

[0021] In some embodiments, the first information is transmitted by one or more of DCI, RRC signaling, and SIB information.

[0022] In some embodiments, the method further includes a step in which the terminal equipment transmits second information to a network device, the second information being used to indicate whether the terminal equipment has the capability to support the pre-compensation.

[0023] In a second aspect, a method for wireless communication is provided, comprising: a step in which a network device transmits first information to a terminal device, the first information being used by the terminal device to determine a plurality of frequency compensation segments within a first time period, the first information being related to DMRS bundling for joint channel estimation, the first time period being related to a time domain position corresponding to the DMRS bundling, and the plurality of frequency compensation segments being used by the terminal device to perform pre-compensation on an uplink channel corresponding to the first time period.

[0024] In some embodiments, the first information is used to determine one or more of the following: a time-domain location of the first time period; an event that disrupts phase continuity within the first time period; an A-TDW within the first time period; and a C-TDW within the first time period.

[0025] In some embodiments, the event that disrupts phase continuity within the first time period comprises updating a TA, the TA comprising a common TA and / or a TA corresponding to the terminal device.

[0026] In some embodiments, the plurality of frequency compensation segments are determined based on the A-TDW and / or the C-TDW within the first time period, and the magnitude of the A-TDW and the magnitude of the C-TDW are dynamically adjusted based on the moving speed and / or antenna switching of satellites in the NTN system.

[0027] In some embodiments, the time domain window corresponding to the DMRS bundling is determined based on the relative position of the terminal device and a satellite in the NTN system.

[0028] In some embodiments, the relative position of the satellite and the terminal device includes an elevation angle of the terminal device with respect to the satellite, and the duration T of the time domain window corresponding to the DMRS bundling satisfies the condition T=K×θ, where θ represents the elevation angle, K represents a proportionality coefficient, and K>0.

[0029] In some embodiments, the first time period includes a plurality of the DMRS bundlings, and each frequency compensation segment in the plurality of frequency compensation segments corresponds to one or more of the DMRS bundlings, respectively.

[0030] In some embodiments, the first information is further used to indicate boundaries of the plurality of frequency compensation segments, and the method further includes a step of the network device determining whether to restrict TA updates based on the boundaries of the plurality of frequency compensation segments.

[0031] In some embodiments, the first information is transmitted by one or more of DCI, RRC signaling, and SIB information.

[0032] In some embodiments, the method further includes the step of the network equipment receiving second information transmitted from a terminal equipment, the second information being used to indicate whether the terminal equipment has the capability to support the pre-compensation.

[0033] In a third aspect, there is provided an apparatus for wireless communication, the apparatus being a terminal device, the terminal device including: a determination unit for determining a plurality of frequency compensation segments within a first time period based on first information, the first information being related to DMRS bundling for joint channel estimation, the first time period including a time domain window corresponding to at least one of the DMRS bundling; and a compensation unit for performing pre-compensation on an uplink channel corresponding to the first time period based on the plurality of frequency compensation segments.

[0034] In a fourth aspect, there is provided an apparatus for wireless communication, the apparatus being a network device, the network device including a transmitting unit for transmitting first information to a terminal device, the first information being used by the terminal device to determine a plurality of frequency compensation segments within a first time period, the first information being related to DMRS bundling for joint channel estimation, the first time period including a time domain window corresponding to at least one of the DMRS bundlings, and the plurality of frequency compensation segments being used by the terminal device to perform pre-compensation for an uplink channel corresponding to the first time period.

[0035] In a fifth aspect, there is provided a communications device including a memory and a processor, wherein the memory is used to store a program, and the processor is used to call the program in the memory to perform the method of the first or second aspect.

[0036] In a sixth aspect, there is provided an apparatus including a processor for calling a program from a memory to perform a method according to the first or second aspect.

[0037] In a seventh aspect, there is provided a chip including a processor for calling a program from a memory to cause a device to which the chip is attached to carry out the method according to the first or second aspect.

[0038] In an eighth aspect, there is provided a computer-readable storage medium having stored thereon a program for causing a computer to execute the method according to the first or second aspect.

[0039] In a ninth aspect, there is provided a computer program product comprising a program for causing a computer to carry out a method according to the first or second aspect.

[0040] In a tenth aspect, there is provided a computer program causing a computer to carry out the method according to the first or second aspect. [Effects of the Invention]

[0041] In an embodiment of the present application, a terminal device determines a plurality of frequency compensation segments within a first time period based on first information. That is, the terminal device segments the first time period based on the first information, and the segmentation is used for pre-compensation of an uplink channel. The first information is related to DMRS bundling included in the first time period, so that the requirement for phase continuity of DMRS bundling is taken into account when performing pre-compensation and segmentation for the first time period, which is advantageous for performing joint channel estimation based on DMRS bundling in a communication system such as an NTN system. [Brief explanation of the drawings]

[0042] [Figure 1] 1 illustrates a wireless communication system applied to an embodiment of the present application. [Figure 2] 1 is an NTN system applied to an embodiment of the present application. [Figure 3] 1 is another NTN system applied to an embodiment of the present application. [Figure 4] 2 is a schematic diagram of a time domain window corresponding to a DMRS applied to an embodiment of the present application; [Figure 5] 1 is a flowchart of a method for wireless communication according to an embodiment of the present application. [Figure 6] 4 is a flowchart of another method for wireless communication according to an embodiment of the present application. [Figure 7] 1 is a schematic diagram of one possible embodiment of a method according to an embodiment of the present application. [Figure 8] 3 is a schematic diagram of another possible embodiment of the method according to the present invention; [Figure 9] 1 is a schematic diagram of yet another possible embodiment of a method according to an embodiment of the present application; [Figure 10] 1 is a structural schematic diagram of an apparatus for wireless communication according to an embodiment of the present application; [Figure 11] FIG. 2 is a structural schematic diagram of another apparatus for wireless communication according to an embodiment of the present application; [Figure 12] 1 is a structural schematic diagram of a communication device according to an embodiment of the present application; DETAILED DESCRIPTION OF THE INVENTION

[0043] Hereinafter, the technical solutions of the embodiments of the present application will be described with reference to the drawings of 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 that a person skilled in the art can obtain based on the embodiments of the present application without any creative work fall within the scope of protection of the present application.

[0044] Embodiments of the present application may be applied to various communication systems, such as a global system of mobile communications (GSM) system, a code division multiple access (CDMA) system, a wideband code division multiple access (WCDMA) system, a general packet radio service (GPRS), a long term evolution (LTE) system, an advanced long term evolution (LTE-A) system, a new radio (NR) system, an evolution of an NR system, an LTE-based access to unlicensed spectrum (LTE-U) system, an NR-based access to unlicensed spectrum (NR-U) system, an NTN system, a universal mobile telecommunication system (UMTS), a wireless local area network (WLAN), a wireless fidelity (WFI), a wireless local area network (WLAN), a wireless cellular ... The present invention may be applicable to wireless fidelity (WiFi) and fifth-generation (5G) communication systems. Embodiments of the present application may also be applicable to other communication systems, such as future communication systems. The future communication systems may be, for example, sixth-generation (6G) mobile communication systems or satellite communication systems.

[0045] Conventional communication systems have limitations in the number of connections they can support and are easy to implement. However, with the development of communication technologies, communication systems can support not only traditional cellular communication but also one or more other types of communication. For example, a communication system can support one or more of device-to-device (D2D) communication, machine-to-machine (M2M) communication, machine-type communication (MTC), enhanced device-type communication (eMTC), vehicle-to-vehicle (V2V) communication, and vehicle-to-everything (V2X) communication, etc., and embodiments of the present application can also be applied to communication systems supporting the above communication methods.

[0046] The communication system in the embodiments of the present application can be applied to a carrier aggregation (CA) scenario, a dual connectivity (DC) scenario, and a standalone (SA) networking scenario.

[0047] The communication system according to the embodiment of the present application may be applied to an unlicensed spectrum, which may also be considered a shared spectrum, or may be applied to a licensed spectrum, which may also be considered a dedicated spectrum.

[0048] Embodiments of the present application may be applied to terrestrial networks (TN) systems and NTN systems, which may include, for example, 4G-based NTN systems, NR-based NTN systems, internet of things (IoT)-based NTN systems, and narrowband internet of things (NB-IoT)-based NTN systems.

[0049] A communication system may include one or more terminal devices, which may also be referred to as user equipment (UE), access terminal, user unit, user station, mobile station, mobile station (MS), mobile terminal (MT), remote station, remote terminal, mobile device, user terminal, terminal, wireless communication device, user agent, or user equipment.

[0050] In some embodiments, the terminal device may be a station (ST) in a WLAN, a cellular phone, a cordless phone, a session initiation protocol (SIP) phone, a wireless local loop (WLL) station, a personal digital assistant (PDA) device, a handheld device with wireless communication capabilities, a computing device or other processing device connected to a wireless modem, an in-vehicle device, a wearable device, a terminal device in a next generation communication system (e.g., an NR system) or a terminal device in a future public land mobile network (PLMN), etc.

[0051] In some embodiments, a terminal device may refer to a device that provides a user with voice and / or data connectivity. For example, the terminal device may be a handheld device with wireless connectivity, an in-vehicle device, etc. As some specific examples, the terminal device may be a mobile phone, a tablet PC (Pad), a laptop, a palmtop PC, a mobile internet device (MID), a wearable device, a virtual reality (VR) device, an augmented reality (AR) device, a wireless terminal in industrial control, a wireless terminal in self-driving, a wireless terminal in remote medical surgery, a wireless terminal in a smart grid, a wireless terminal in transportation safety, a wireless terminal in a smart city, a wireless terminal in a smart home, etc.

[0052] In some embodiments, the terminal equipment may be located on land. For example, the terminal equipment may be located indoors or outdoors. In some embodiments, the terminal equipment may be located on water, for example, on a steamship. In some embodiments, the terminal equipment may be located in the air, for example, on an airplane, a balloon, or a satellite.

[0053] In addition to the terminal device, the communication system may further include one or more network devices. The network device in the present embodiment may be a device for communicating with the terminal device, and may also be referred to as an access network device or a radio access network device. The network device may be, for example, a base station. The network device in the present embodiment may refer to a radio access network (RAN) node (or device) that allows the terminal device to access the wireless network. The base station may broadly cover or be replaced with various names such as a Node B (Node B), evolved Node B (eNB), next generation Node B (gNB), relay station, access point, transmitting and receiving point (TRP), transmitting point (TP), primary base station MeNB, secondary base station SeNB, multi-standard radio (MSR) node, home base station, network controller, access node, radio node, access point (AP), transmission node, transceiver node, base band unit (BBU), remote radio unit (RRU), active antenna unit (AAU), remote radio head (RRH), central unit (CU), distributed unit (DU), positioning node, etc. The base station may be a macro base station, a micro base station, a relay node, a donor node, or the like, or a combination thereof. The base station may also refer to a communication module, modem, or chip installed in the aforementioned device or apparatus, etc. The base station may also be a mobile switching center and a device that functions as a base station in D2D, V2X, and M2M communications, a network side device in a 6G network, or a device that functions as a base station in a future communication system.The base station can support networks of the same or different access technologies, and the embodiments of the present application do not limit the specific technologies adopted by the network equipment and the specific equipment configurations.

[0054] A base station may be fixed or mobile. For example, a helicopter or a drone may be configured as a mobile base station, and one or more cells may move based on the location of the mobile base station. In another example, a helicopter or a drone may be configured as a device for communicating with another base station.

[0055] In some deployments, the network equipment in the embodiments of the present application may refer to a CU or a DU, or may include a CU and a DU. The gNB may further include an AAU.

[0056] By way of non-limiting example, in some embodiments of the present application, the network equipment may have mobile characteristics, e.g., the network equipment may be a mobile equipment. In some embodiments of the present application, the network equipment may be a satellite or balloon station. In some embodiments of the present application, the network equipment may also be a base station located at a location such as on land or in a body of water.

[0057] In an embodiment of the present application, a network device can provide a service to a cell, and a terminal device communicates with the network device through transmission resources (e.g., frequency domain resources, i.e., spectrum resources) used by the cell. The cell may be a cell corresponding to the network device (e.g., a base station), and the cell may belong to a macro base station or a base station corresponding to a small cell. The small cell here may include a metro cell, a micro cell, a pico cell, a femto cell, etc. These small cells are characterized by a small coverage range and low transmission power and are adapted to provide high-rate data transmission services.

[0058] 1 is a schematic diagram of a communication system architecture according to an embodiment of the present application. As shown in FIG. 1, the communication system 100 may include a network device 110, which may be a device that communicates with terminal devices 120 (also referred to as communication terminals or terminals). The network device 110 may provide communication coverage in a specific geographic area and communicate with terminal devices located within the coverage area.

[0059] The communication system 100 shown in FIG. 1 exemplarily illustrates one network device and two terminal devices, and in some embodiments of the present application, the communication system 100 may include multiple network devices, and the coverage range of each network device may include other numbers of terminal devices, and this is not limited to the embodiments of the present application.

[0060] Illustratively, Figure 2 is a schematic diagram of the architecture of the NTN system. As shown in Figure 2, the satellite radio access network 200 includes a satellite 210, a service link 220, a feeder link 230, a terminal device 240, a gateway 250, and a network 260 including a base station and a core network.

[0061] Satellite 210 is a space-based vehicle. Service link 220 refers to the link between satellite 210 and terminal equipment 240. Feeder link 230 refers to the link between gateway 250 and satellite 210. Earth-based gateway 250 connects satellite 210 to a base station or core network, the specifics of which are determined based on the architecture choice.

[0062] The NTN architecture shown in Figure 2 is a bent-pipe transponder architecture, in which the base station is located on Earth behind the gateway 250, and the satellite 210 functions as a relay. The satellite 210 acts as a repeater, forwarding signals from the feeder link 230 to the service link 220, or forwarding signals from the service link 220 to the feeder link 230. In other words, the satellite 210 does not have base station functionality, and communication between the terminal equipment 240 and the base stations in the network 260 must be performed using the satellite 210.

[0063] For example, Figure 3 is a schematic diagram of another architecture of an NTN system. As shown in Figure 3, a satellite radio access network 300 includes a satellite 310, a service link 320, a feeder link 330, a terminal device 340, a gateway 350, and a network 360. Compared to Figure 2, in Figure 3, a base station 312 is provided on the satellite 310, and the network 360 behind the gateway 350 only includes a core network.

[0064] The NTN architecture shown in Figure 3 is a regenerative transponder architecture. In this architecture, a satellite 310 carries a base station 312 and can be directly connected to an Earth-based core network using a link. The satellite 310 has the functionality of a base station, and terminal equipment 340 can communicate directly with the satellite 310. Therefore, the satellite 310 may be referred to as a network equipment.

[0065] The communication system of the architecture shown in Figures 2 and 3 may include multiple network devices, and the coverage range of each network device may include other numbers of terminal devices, and this is not limited in the embodiments of the present application.

[0066] In the embodiments of the present application, the wireless communication systems shown in Figures 1 to 3 may further include other network entities such as a mobility management entity (MME), an access and mobility management function (AMF), etc., and the embodiments of the present application are not limited thereto.

[0067] It should be understood that in the embodiments of the present application, a device having a communication function in a network / system can be referred to as a communication device. Taking the communication system 100 shown in Fig. 1 as an example, the communication device may include a network device 110 and a terminal device 120 having a communication function, where the network device 110 and the terminal device 120 may be the above-mentioned specific devices, and detailed descriptions thereof will be omitted here. The communication device may also include other devices in the communication system 100, such as other network entities such as a network controller, a mobility management entity, etc., and the embodiments of the present application are not limited thereto.

[0068] For ease of understanding, some related technical knowledge regarding the embodiments of the present application will be explained first. Hereinafter, the related technologies can be arbitrarily combined with the technical solutions of the embodiments of the present application as optional means, and they all fall within the protection scope of the embodiments of the present application. The embodiments of the present application include at least some of the following contents:

[0069] As communication technology develops, communication systems (e.g., 5G) have the market potential to integrate satellite and terrestrial network infrastructure. For example, 5G standards have made NTN, including the satellite segment, part of the 5G connectivity infrastructure of the well-known 3rd generation partnership project (3GPP®).

[0070] Communication satellites are classified by orbital height into low Earth orbit (LEO), medium Earth orbit (MEO), geostationary Earth orbit (GEO), and high elliptical orbit (HEO). LEO is an orbit centered on the Earth with an altitude of 2,000 km or less, or with at least 11.25 periods per day, and an eccentricity of less than 0.25. Most artificial objects in outer space are located in LEO. LEO satellites move around the Earth at high speed (mobility) but on predictable or determinable orbits.

[0071] Satellites at different orbital altitudes have different orbital periods.

[0072] LEO: Typical altitudes are 250km to 1,500km, with orbital periods of 90 to 120 minutes.

[0073] MEO: Typical altitudes are 5,000km to 25,000km, with orbital periods of 3 hours to 15 hours.

[0074] GEO: Altitude is approximately 35,786 km, and the orbital period is 24 hours.

[0075] NTN refers to a network or network segment that uses radio frequency (RF) resources on a satellite or unmanned aerial system (UAS) platform. Typical NTN scenarios for accessing terminal equipment involve NTN transparent payloads or NTN regenerative payloads. Figures 2 and 3 above show two NTN system architectures, taking satellites as examples. The bent-pipe transponder architecture shown in Figure 2 corresponds to the NTN transparent payload, while the regenerative transponder architecture shown in Figure 3 corresponds to the NTN regenerative payload.

[0076] In the NTN system, the NTN node (e.g., a satellite) is located several hundred kilometers above the Earth's surface, and the round trip time (RTT) from the terminal equipment to the satellite is relatively long. Therefore, the round trip time from the terminal equipment to the NTN node is much higher than the round trip time from the terminal equipment to the network equipment in a terrestrial network. In the relevant specifications, the propagation time delay from the terminal equipment (UE) to the satellite can be seen in Table 1.

[0077] Table 1 Propagation time delay between UE and satellite

[0078] [Table 1]

[0079] When NTN network uses satellite radio frequency resources for communication, communication satellites at different orbital heights move at different speeds relative to the Earth, for example, LEO satellites in low orbit move at high speeds, while GEO satellites in high orbits are stationary relative to the Earth.

[0080] The data transmission method in the NTN system can be compared to the TN system. In the data transmission process, the signal used for uplink and downlink data demodulation is DMRS. In the NR system, there are two DMRS designs: pre-DMRS and additional DMRS.

[0081] The pre-DMRS is the first signal to appear. Within each scheduling time unit, the first appearance of the DMRS should be as close to the start of scheduling as possible. For slot-based scheduling transmissions (e.g., Type A), the pre-DMRS pilot should be located after the physical downlink control channel (PDCCH) region. That is, the pre-DMRS position is usually determined by the PDCCH configuration. If the PDCCH occupies the previous two orthogonal frequency division multiplexing (OFDM) symbols, the DMRS starts from the third symbol. If the PDCCH occupies the three previous OFDM symbols, the DMRS starts from the fourth symbol. For non-slotted scheduling transmissions (e.g., Type B), the scheduling unit is less than one slot, so the pre-DMRS pilot starts transmitting from the first symbol of the scheduling region.

[0082] The additional DMRS is a repetition of the pre-DMRS. In medium- to high-speed mobile scenarios, it is necessary to insert more DMRS pilot symbols within the scheduling duration to ensure the accuracy of channel time-varying estimation. Therefore, NR adopts a combination of pre-DMRS and additional DMRS. Specifically, the pattern of the additional DMRS pilots in each group is a repetition of the pre-DMRS pilots, that is, the additional DMRS pilots and pre-DMRS pilots in each group occupy the same subcarriers and the same number of OFDM symbols.

[0083] Rel-17 introduces joint channel estimation across multiple consecutive slots to achieve coverage extension. Joint channel estimation can jointly estimate the DMRSs of multiple consecutive slots, improving the accuracy of channel estimation and thereby effectively improving the coverage performance of the corresponding channel. For example, for a terminal device at the cell edge, the channel condition between it and the network equipment is poor and the signal-to-interference-and-noise ratio level on the terminal device side is low. The network equipment can adopt joint channel estimation to improve the accuracy of uplink channel estimation, improving the demodulation performance of the received signal and thereby improving the corresponding channel coverage.

[0084] In joint channel estimation, the network equipment configures relevant signaling to instruct the terminal equipment to perform DMRS bundling during uplink transmission. The main constraints of DMRS bundling are maintaining power consistency and phase continuity. To support DMRS bundling, the relevant technical specifications impose limited phase continuity requirements. For example, technical specification TS 38.101-1 [3] requires that for a DMRS bundling configuration supporting frequency division duplexing (FDD) frequency bands and 16 slots, the maximum allowable phase difference between slot 0 and any slot "p" to which DMRS bundling is applied is 30°C. For a DMRS bundling configuration supporting FDD frequency bands and 8 slots or less, the maximum allowable phase difference between any two consecutive slots to which DMRS bundling is applied (e.g., slot "p-1" and slot "p") must not exceed 25°C.

[0085] To specify the duration of channel bundling, a configured time domain window (C-TDW) is introduced in joint channel estimation. The C-TDW may also be called the nominal TDW. Generally, the duration of a TDW can be expressed as the number of consecutive slots. Except for the last C-TDW, the duration of each C-TDW can be given by higher layer configuration.

[0086] In the standardization of joint channel estimation, various time-domain window design structures are considered for various types of DMRS bundling. A two-stage structure combining a C-TDW and an actual time-domain window (A-TDW) is commonly used for joint channel estimation. The terminal device can determine the A-TDW for DMRS bundling based on specific principles based on the C-TDW configured by the base station. For example, the first A-TDW starts from the first symbol of the channel transmission and ends before an event occurs. An event is an event that may disrupt power integrity or phase continuity. These events include discarding or canceling transmission events defined under the Rel-15 / 16 collision rules, as well as other factors that may disrupt the defined power integrity or phase continuity. After an event occurs, the terminal device can determine whether to activate a new A-TDW based on its configuration, event type, and its own capabilities. The A-TDW also terminates when the channel transmission ends.

[0087] Taking physical uplink shared channel (PUSCH) transmission as an example, a terminal device defines a C-TDW and an A-TDW when transmitting a PUSCH. The C-TDW includes one or more consecutive slots, and one or more C-TDWs jointly cover all PUSCH repeated transmissions in the time domain. Furthermore, one or more A-TDWs can be implicitly determined within each C-TDW, and the PUSCH transmission for which joint channel estimation can actually be performed is determined by the A-TDW. That is, it is desirable for the network device to ensure that the terminal device maintains power consistency and phase continuity in each A-TDW.

[0088] For ease of understanding, the following will be described in detail with reference to FIG. 4, taking the time domain window of DMRS bundling corresponding to PUSCH repetitive transmission as an example.

[0089] Referring to Figure 4, the time domain window of the DMRS bundling includes 16 slots, the number of PUSCH repetitions is 16, and the length of the C-TDW is configured as 4 slots, i.e., all PUSCH repetitions are covered by the four C-TDWs within the time domain window.

[0090] Continuing to refer to Figure 4, the start and end slots of the A-TDW are both related to the C-TDW and the event. As shown in Figure 4, the A-TDW does not cover repeated transmissions corresponding to an event. The start slot of the A-TDW may be the start slot of each C-TDW or the slot following the event. The end slot of the A-TDW may be the end slot of each C-TDW or the slot before the event occurs. Therefore, within one C-TDW, an A-TDW is generated after the event ends.

[0091] The above describes DMRS bundling for joint channel estimation with reference to Figure 4. The current DMRS bundling standard is defined based on the TN system. Because the round-trip delay variation in the TN system is very small, the phase continuity required by the specification can be maintained when the terminal device does not perform autonomous TA adjustment during the A-TDW period. However, for communication systems with relatively high mobility, such as the NTN mentioned above, the phase continuity requirement based on DMRS bundling in the above specification cannot be ensured to be met due to network characteristics such as large propagation delay and device movement.

[0092] Taking the NTN system as an example, the distance between the satellite and the terminal equipment is long, resulting in a large transmission time delay. Large propagation delays result in large timing advance (TA) values, which can lead to misalignment between the downlink and uplink sequences and potentially misalignment between the downlink slot index on the network equipment side and the uplink slot index on the terminal equipment side. Furthermore, rapid satellite movement also causes rapid changes in delay, requiring the terminal equipment to frequently adjust the TA to compensate for the time domain. That is, a fast satellite movement speed can cause large changes in the round-trip delay, resulting in phase discontinuity and time synchronization loss. Changes in round-trip delay result in time drift. Time drift can also be called timing drift or time delay drift. The terminal equipment phase shifts due to time drift. Phase offset is a phase shift. The phase shift due to time drift can be calculated using the following formula:

number

[0093] where φ is the phase shift, Δf is the channel bandwidth, and ΔT is the maximum round trip delay variation.

[0094] In the NTN system, communication devices can derive time drift to determine phase shift. For service links, the time drift can be derived based on the terminal device's position and satellite ephemeris, and for feeder links, the time drift can be derived based on the common TA drift.

[0095] Taking the NTN system as an example, the relative movement between the satellite and the terminal equipment results in a relatively high Doppler shift. To maintain frequency synchronization, the terminal equipment needs to pre-compensate for the frequency offset caused by the high Doppler shift. The high speed of low-orbit satellites in particular also causes rapid changes in Doppler shift. Both the high Doppler shift and the rapid changes in Doppler shift result in an offset in the phase of the terminal equipment transmitting the uplink channel. The phase shift caused by the Doppler shift is mainly due to the frequency drift during the repetition period. Specifically, the phase shift caused by the Doppler shift can be calculated using the following formula:

number

[0096] where φ is the phase shift, f is the Doppler shift, and t is the duration.

[0097] To summarize, in communication systems such as NTN, the phase offset of the terminal equipment is affected by Doppler shift and time drift and is much larger than the phase offset in TN systems.

[0098] In such communication systems, when a communication device performs joint channel estimation based on DMRS bundling, it may not be possible to ensure phase continuity within a specified time-domain window. If the terminal device does not perform frequency pre-compensation, the change in Doppler shift is the main cause of phase difference. For example, if the terminal device does not update the frequency pre-compensation value during the TDW period of LEO-1200, the phase difference will not meet the phase difference requirement of DMRS bundling.

[0099] To solve some of the above problems, an embodiment of the present application provides a method for wireless communication, which allows a terminal device to consider the phase continuity requirement of DMRS bundling when performing pre-compensation and segmentation for a first time period, and is advantageous for performing joint channel estimation based on DMRS bundling in a communication system such as NTN. Hereinafter, a method embodiment of the present application will be described in detail with reference to FIG. 5.

[0100] Referring to FIG. 5, in step S510, the terminal device determines a plurality of frequency compensation segments in a first time period based on first information.

[0101] The terminal equipment is a device that communicates with any of the network devices described above. In some embodiments, the terminal equipment may be a device that communicates with an airborne platform via a service link in an NTN system, or may be a gateway that communicates with an airborne platform via a feeder link. The airborne platform may be, for example, a satellite or an unmanned aerial vehicle system.

[0102] A network device is a communication device that provides network services to terminal devices. In some embodiments, the network device that communicates with the terminal devices may be a satellite in an NTN system.

[0103] The terminal device may receive the first information dynamically configured by the network device, or may determine the first information based on a pre-configuration or pre-definition of the network device, and is not limited thereto.

[0104] In some embodiments, the network device can transmit the first information to the terminal device in various manners. For example, the network device can indicate the first information to the terminal device by downlink control information (DCI). For another example, the network device can transmit the first information to the terminal device by radio resource control (RRC) signaling. For another example, the network device can perform predefinition by RRC signaling and further indicate related parameter values ​​by DCI. For another example, the network device can transmit the first information to the terminal device by system information block (SIB) information.

[0105] The first information can be used to assist the terminal device in performing operations related to DMRS bundling. In some embodiments, the first information may include information such as the duration of DMRS bundling, configuration information for C-TDW, or events within the DMRS bundling window. The terminal device can transmit uplink channels based on this information. For example, the terminal device can repeatedly transmit a PUSCH to the network device using time-domain resources corresponding to the DMRS bundling, thereby facilitating the network device to perform joint channel estimation. That is, the first information may be related to DMRS bundling for joint channel estimation. For example, the terminal device can determine the start and end slots of the A-TDW within the DMRS bundling window based on the first information, thereby determining the time period during which power consistency and phase continuity need to be ensured. For example, the terminal device can determine events indicated by the network device based on the first information, thereby determining the time-domain window structure within the DMRS bundling window.

[0106] As can be seen from the above, the DMRS bundling window is a time domain window corresponding to the DMRS bundling, and resources corresponding to the time domain window may be used for repeated transmission of an uplink channel. In some embodiments, the uplink channel may be a PUSCH or a physical uplink control channel (PUCCH).

[0107] The first information may further be used to determine a first time period during which the terminal device needs to perform time-frequency pre-compensation. As described above, in an NTN system, the terminal device needs to perform time-frequency pre-compensation on the uplink channel to reduce phase discontinuity and time asynchrony caused by large propagation delays and high Doppler shifts. The first time period may be a time-domain resource in which the terminal device transmits an uplink channel based on one or more DMRS bundlings. Therefore, the first time period may be determined based on the time-domain resource of the uplink channel that needs to be transmitted, or may be determined based on the DMRS bundling window corresponding to the uplink channel. For example, if the terminal device needs to transmit 16 repetitions of the PUCCH, the first time period may correspond to 16 slot resources. For example, the first time period may be determined based on the DMRS bundling window of the uplink channel of the terminal device.

[0108] The first time period may include a time-domain window corresponding to at least one DMRS bundling. For example, the first time period may include only a time-domain window corresponding to one DMRS bundling. That is, the first time period is one DMRS bundling window. For example, the first time period may extend beyond multiple DMRS bundling windows, thereby allowing the terminal device to determine multiple frequency compensation segments and perform corresponding time-frequency pre-compensation.

[0109] In some embodiments, the time domain window corresponding to DMRS bundling may be determined based on the relative positions of a satellite and a terminal device in an NTN system. For example, the duration of the DMRS bundling window may be determined based on the elevation angle between the satellite and the terminal device. The elevation angle between the satellite and the terminal device is the elevation angle of the terminal device relative to the satellite. The elevation angle is the angle between the line connecting the satellite and the terminal device and the ground, i.e., the elevation angle of the satellite relative to the ground, or the angle of elevation above the ground plane. The value of the elevation angle ranges from 0° to 90°.

[0110] In a possible embodiment, the duration of the DMRS bundling window may be determined based on the elevation angle. The elevation angle is proportional to the bundling time. The larger the elevation angle, the longer the DMRS bundling time. For example, if T represents the duration of the DMRS bundling window, T may be determined based on the following condition: T=K×θ can be satisfied, where θ is the elevation angle between the satellite and the terminal device, and K is a proportionality coefficient, where K>0.

[0111] The first information is used to determine one or more of the first time periods, facilitating the terminal device to segment the first time period based on pre-compensation. Such information may be, for example, a time-domain position of the first time period, an event that disrupts phase continuity within the first time period, an A-TDW within the first time period, or a C-TDW within the first time period. In a possible embodiment, the first information may directly indicate such information, or may be used by the terminal device to determine such information.

[0112] The event that disrupts phase continuity within the first time period may include multiple types of events described above, and may also include a TA update. The TA includes a common TA and / or a TA corresponding to a terminal device. A TA corresponding to a terminal device may be referred to as a specific TA. The terminal device may update the common TA or the specific TA during or within each DMRS bundling window. For example, in an NTN system, the terminal device can manage its specific TA based on information such as satellite ephemeris, a global navigation satellite system (GNSS), and network configuration. Specifically, the terminal device can update and derive its own specific TA and common TA based on satellite ephemeris information and related RRC parameters, respectively. TA fluctuations at the terminal device side may cause phase discontinuity during uplink transmission.

[0113] The A-TDW and C-TDW within the first time period may be related to the mobility information and / or coverage performance of the network equipment. Exemplarily, in an NTN system, the magnitude of the TDW may be dynamically adjusted based on the mobility speed of the satellite. That is, the magnitude of the A-TDW and the magnitude of the C-TDW may be dynamically adjusted based on the mobility speed of the satellite in the NTN system. For example, the terminal equipment may determine the configuration parameters of the C-TDW based on the mobility information of the satellite. The terminal equipment may determine the magnitude of the A-TDW based on the C-TDW and the occurrence time of an event. Exemplarily, in an NTN system, the coverage performance of the satellite may be adjusted by satellite antenna switching. Therefore, the magnitude of the A-TDW and the magnitude of the C-TDW may further be dynamically adjusted based on the satellite antenna switching in the NTN system. Exemplarily, in an NTN system, the magnitude of the TDW may further be dynamically adjusted by comprehensively considering the mobility speed and antenna switching of the satellite.

[0114] In one possible embodiment, antenna switching is the trigger event for DMRS bundling, where the A-TDW of DMRS bundling ends within the C-TDW. By combining antenna switching and DMRS bundling, coverage gaps can be eliminated when IP-based voice transmission (voice over internet protocol, VoIP) transmits PUSCH. When using DMRS bundling, the antenna switching possibilities are limited due to phase continuity and power consistency during the TDW of DMRS bundling. Therefore, antenna switching can only be performed at the boundary of DMRS beams. A small antenna switching interval (e.g., 20 ms for uplink VoIP) can utilize more spatial diversity within the transmission time, while a large TDW can provide more channel estimation gain. Therefore, when DMRS bundling and antenna switching are combined, the required signal-to-noise ratio (SNR) does not decrease with the increase in the TDW, as with the antenna switching interval. When the A-TDW and inter-antenna switching are equal to a certain value, the satellite coverage performance can achieve an optimal tradeoff between spatial diversity gain, channel coding gain, and joint channel estimation gain. This shows that when A-TDW is jointly determined by C-TDW and the antenna switching interval, it contributes to achieving an optimal trade-off between the channel estimation phase continuity requirement and the large spatial diversity gain of antenna switching.

[0115] In some embodiments, the terminal device may determine the time-domain location of the first time period based on the first information. The time-domain location of the first time period may refer to the start time-domain location and end time-domain location of the first time period, the start time-domain location and duration of the first time period, the duration and end time-domain location of the first time period, or the start and end time-domain location and duration of the first time period. For example, the first information includes information on multiple contiguous DMRS bundling windows, and the terminal device may determine the duration of the first time period based on the continuity of adjacent DMRS bundling windows. If the first time period spans time-domain windows corresponding to multiple DMRS bundlings, the time-domain location of the first time period may be determined based on the multiple time-domain windows. For example, the first information may indicate only related information corresponding to one DMRS bundling, and the first time period may coincide with the time-domain window corresponding to the DMRS bundling.

[0116] In some embodiments, the terminal device may determine a phase continuity disrupting event and a C-TDW within the first time period based on the first information, e.g., based on indication information associated with each DMRS bundling in the network device, the terminal device may determine a power integrity and phase continuity disrupting event and a C-TDW within the first time period.

[0117] In some embodiments, the terminal device may determine the A-TDW within the first time period based on first information, for example, each DMRS bundling window and its corresponding event, and C-TDW configuration information.

[0118] The terminal device may determine a plurality of frequency compensation segments within the first time period based on the first information. The frequency compensation segments refer to time periods in which pre-compensation is performed on uplink channels and may also be referred to as UL segments or UL segmentation. The terminal device may directly segment the first time period based on the first information, or may segment the first time period based on the information determined by the first information.

[0119] In some embodiments, the terminal device can directly segment based on the first information. That is, the network device can indicate the first time period and its segmentation scheme to the terminal device through the first information. In one possible embodiment, the network device can configure multiple frequency compensation segments through DCI. In another possible embodiment, the network device can indicate or configure multiple frequency compensation segments to the terminal device through RRC signaling. In another possible embodiment, the network device can configure the terminal device with a predefined bundling parameter (bundling size) or a set bundling parameter subset through RRC signaling, and then indicate a specified value of the subset through DCI.

[0120] In some embodiments, the terminal device may perform precompensation update based on an instruction from the network device. The network device may use the first information to indicate time domain resources for uplink channel repeat transmission. The terminal device may specify precompensation update timing by configuring the time domain resources. In a possible embodiment, when the terminal device performs uplink channel repeat transmission based on multiple consecutive slots, precompensation update is prohibited within a segment of consecutive slots and precompensation update is only permitted during each time period. The length of each time period may be configured by the network device through RRC signaling. The network device may determine the length of the time period based on a drift rate. In an NTN system, the drift rate may be estimated based on satellite ephemeris.

[0121] In some embodiments, the terminal device may segment the first time period based on the time domain location of the first time period or the events within the first time period, the A-TDW, and the C-TDW, as described in more detail below with reference to FIG.

[0122] Note that an update between frequency compensation segments by a terminal device may be defined as an event that causes power consistency and phase continuity to be lost, and this definition may be specified in higher layers.

[0123] In step S520, the terminal device pre-compensates an uplink channel corresponding to a first time period based on a plurality of frequency compensation segments.

[0124] The terminal device maintains time and frequency continuity within each frequency compensation segment by performing pre-compensation based on multiple frequency compensation segments. In some embodiments, the terminal device may perform pre-compensation for each frequency compensation segment based on multiple segmentation of the first time period. In some embodiments, the terminal device may perform pre-compensation for some of the frequency compensation segments based on multiple segmentation of the first time period. In some embodiments, if the first time period is multiple consecutive slots, the terminal device may segment based on the slots.

[0125] In one possible embodiment, the terminal device can use pre-compensation to maintain continuity in time and frequency within each frequency compensation segment, but not continuity within different frequency compensation segments. In another possible embodiment, the terminal device can use pre-compensation to maintain continuity in time and frequency within multiple frequency compensation segments.

[0126] The terminal device may perform pre-compensation for each frequency compensation segment through channel estimation and / or frequency offset estimation. In some embodiments, if the path loss and Doppler shift of uplink and downlink transmissions are similar, the terminal device may estimate them based on the received downlink channel. Based on the channel response estimated via the downlink, a frequency offset value is determined using the DMRS symbol, thereby performing pre-compensation. The frequency offset value may be used to determine the compensation value for pre-compensation. The compensation value may also be referred to as a pre-compensation value or pre-compensation number. In some embodiments, the terminal device may perform frequency offset estimation and frequency compensation based on one or more DMRS symbols in the first time domain unit within the frequency compensation segment. The first time domain unit may be the first slot. In some embodiments, the terminal device may determine the compensation value for the current frequency compensation segment based on the compensation status of adjacent frequency compensation segments. In some embodiments, the terminal device may set corresponding adjustment factors for multiple frequency compensation segments based on phase continuity. Each frequency compensation segment corresponding to the adjustment factor may be the same, or each frequency compensation segment may be different.

[0127] The terminal device can perform pre-compensation for each frequency compensation segment in various ways. The pre-compensation method may be determined based on the time domain position of the first frequency compensation segment within the first time period. Details will be described later with reference to FIGS. 7 to 9.

[0128] Before the terminal device performs pre-compensation for multiple frequency compensation segments based on the first information, it must further notify the network device of whether it supports segmentation and pre-compensation. That is, the network device transmits first information for segmentation and pre-compensation to the terminal device to determine whether the terminal device has the capability of segmentation and pre-compensation. In some embodiments, the terminal device may transmit second information to the network device. The second information is used to indicate whether the terminal device has the capability to support segmentation and pre-compensation. That is, for joint channel estimation based on DMRS bundling, the network device supports the terminal device reporting a capability indication for segmentation and pre-compensation.

[0129] As can be seen from FIG. 5, the terminal device can perform segmentation and pre-compensation on the uplink channel within the first time period. The segmentation and pre-compensation may include time and frequency pre-compensation. As mentioned above, time misalignment and frequency offset all cause phase offsets, and segmentation and pre-compensation can ensure phase continuity when the network device performs joint channel estimation. If the terminal device directly performs pre-compensation on the first time period consisting of one or more DMRS bundling windows, the compensation value may not be able to avoid events that disrupt phase continuity.

[0130] Fig. 5 explains the method of the present embodiment from the perspective of the terminal device, and below, the method will be explained from the perspective of the interaction between the terminal device and the network device with reference to Fig. 6. Note that for the sake of brevity, the explanation of the names shown in Fig. 5 will be omitted.

[0131] 6, in step S610, the terminal device transmits second information to the network device. As described above, the second information is used to report the capabilities of the terminal device to the network device.

[0132] In some embodiments, the second information is further used by the terminal device to instruct the network device to determine whether to update the TA based on the segmentation of the frequency compensation segment. When the terminal device determines whether to update the TA based on the boundary of the frequency compensation segment, the network device can restrict the TA update of the terminal device within the frequency compensation segment, thereby ensuring phase continuity within the frequency compensation segment. For example, the network device can instruct the terminal device to update its TA during the DMRS bundling window and prevent the occurrence of unexpected events via an RRC instruction. In this case, the frequency compensation segments in the DMRS bundling window are contiguous. That is, the DMRS bundling window corresponds to one frequency compensation segment. The terminal device can determine the frequency compensation value for the entire DMRS period through a single frequency offset estimation.

[0133] In step S620, the network device transmits the first information to the terminal device, which has already been described in step S510 of Fig. 5, and therefore will not be described here.

[0134] As described above, the terminal device may directly determine a plurality of frequency compensation segments based on the first information of the network device, or may segment the first time slot based on the first information. Whether configured by the network device or determined by the terminal device, segmentation can be based on a plurality of pieces of information determined by the first information as described above. A specific segmentation method will be described below with reference to FIG. 7.

[0135] In some embodiments, the segmentation of the multiple frequency compensation segments may be determined based on the time-domain position of the first time period and an event that disrupts phase continuity within the first time period. Specifically, the start time-domain position of the first frequency compensation segment in the multiple frequency compensation segments may be determined based on the start position of the first time period. The end time-domain position of the first frequency compensation segment may be determined based on an event within the first time period. That is, when an event occurs, the frequency compensation segment ends. After the event ends, a new frequency compensation segment is generated. The end time-domain position of the last frequency compensation segment in the multiple frequency compensation segments may be determined based on the end position of the first time period. As shown in FIG. 7, the first time period includes 16 slots for repeated transmission of the PUSCH. Three events are included in the first time period, located in the fifth slot, the eleventh slot, and the last slot, respectively. Based on the above principle, the first time period shown in FIG. 7 includes three frequency compensation segments. The first frequency compensation segment covers the first through fourth slots, the second frequency compensation segment covers the sixth through tenth slots, and the third frequency compensation segment covers the twelfth through fifteenth slots.

[0136] In some embodiments, the segmentation of the multiple frequency compensation segments may be further determined based on the A-TDW within the first time period. The A-TDW may be determined by the terminal device based on the C-TDW of DMRS bundling and an event, and the frequency compensation segments may be determined based on the time period corresponding to the A-TDW. In possible embodiments, the frequency compensation segments may be greater than, equal to, or smaller than the A-TDW. In possible embodiments, the frequency compensation segments may include one or more A-TDWs. As shown in FIG. 7, the first frequency compensation segment is equal to the first A-TDW. The second and third frequency compensation segments each include two A-TDWs. Note that if the network device instructs to prevent the occurrence of a sudden event within a specific time domain window, the multiple frequency compensation segments may be consecutive even if the uplink segmentation is based on the A-TDW.

[0137] In some embodiments, the segmentation of the multiple frequency compensation segments is further determined based on the C-TDW and an event for the first time period. The C-TDW may cover all time domain windows corresponding to DMRS bundling. The frequency compensation segments may correspond to one or more C-TDWs based on the event. In a possible embodiment, the frequency compensation segments may be greater than or less than the C-TDW. As shown in FIG. 7, the first frequency compensation segment is equal to the first C-TDW. The second and third frequency compensation segments each correspond to two C-TDWs. Note that if the network device instructs to prevent the occurrence of a sudden event within a specific time domain window, the multiple frequency compensation segments may be consecutive even if the uplink segmentation is based on the C-TDW.

[0138] In some embodiments, the segmentation scheme of the multiple frequency compensation segments may be further determined based on a time-domain window corresponding to a DMRS bundling. For example, a frequency compensation segment can span one or more DMRS bundling windows if the phases are continuous and there are no discontinuities due to TA adjustments or events. That is, if the first time period includes multiple DMRS bundlings, each frequency compensation segment in the multiple frequency compensation segments can correspond to one or more DMRS bundlings. For example, the first time period in FIG. 7 includes only one DMRS bundling window, and all three frequency compensation segments correspond to one DMRS bundling. For example, if the first time period includes multiple DMRS bundling windows, and the adjacent slots of two or more DMRS bundling windows are all phase-continuous, the frequency compensation segment can correspond to two or more DMRS bundlings with continuous phases.

[0139] In some embodiments, when the network device directly indicates boundaries of the plurality of frequency compensation segments using the first information, the terminal device can further determine whether to update the TA based on the boundaries of the plurality of frequency compensation segments. That is, the terminal device can determine when to adjust or update the TA based on the segmentation scheme of the plurality of frequency compensation segments. For the network device, the network device can restrict the TA update of the terminal device in the frequency compensation segment. For example, the network device can determine whether to restrict the TA update based on the boundaries of the plurality of frequency compensation segments.

[0140] The above describes the segmentation method of the multiple frequency compensation segments within the first time period, and the terminal device compensates for the multiple frequency compensation segments based on the segmentation. The compensation methods for each frequency compensation segment may be the same or different.

[0141] Typically, to ensure phase continuity, the terminal equipment must calculate and precompensate the uplink channel before repeated transmission. To better precompensate the frequency compensation segment, a compensation value must be determined by accurately estimating the frequency offset. The compensation value may be related to the frequency offset. The frequency offset generates a phase offset corresponding to the first frequency compensation segment, thereby causing phase discontinuity. Therefore, frequency precompensation for the uplink channel can improve phase continuity. As described above, the phase offset may be determined based on the Doppler shift due to the relative motion between the terminal equipment and the network equipment, and also based on the time drift between the terminal equipment and the network equipment. After precompensation, the residual frequency offset of the terminal equipment is preferably 0.1 PPM. The frequency offset is primarily determined by the terminal equipment's local crystal oscillator. That is, the residual frequency offset can be obtained based on the inaccuracy of the combination of the terminal equipment's local oscillator location, the terminal equipment's autonomous time based on the terminal equipment's position and the ephemeris information of the serving satellite, and the frequency precompensation compensation value.

[0142] Among the multiple frequency compensation segments in the first time period, the frequency compensation segment for which the terminal device needs to perform pre-compensation may be referred to as the first frequency compensation segment. That is, the first frequency compensation segment may represent each frequency compensation segment of the multiple frequency compensation segments. The compensation value corresponding to the first frequency compensation segment is the first compensation value. Before performing pre-compensation for the first frequency compensation segment, the terminal device may determine the first compensation value corresponding to the first frequency compensation segment.

[0143] As described above, the terminal device performs pre-compensation using channel estimation and / or frequency offset estimation. That is, the first compensation value may be determined based on, for example, one or more pieces of information: a time-domain position of the first frequency compensation segment within the first time period, a downlink channel received by the terminal device prior to the first time period, one or more DMRS symbols of the first time-domain unit within the first frequency compensation segment, a second compensation value corresponding to a second frequency compensation segment preceding the first frequency compensation segment, and an adjustment factor related to phase continuity of the first frequency compensation segment.

[0144] It should be noted that the time domain unit referred to in the embodiments of the present application may be a slot, a symbol, or any other specified time domain unit, and is not limited thereto.

[0145] In some embodiments, if the first frequency compensation segment is the first frequency compensation segment in the first time period, the first compensation value may be determined based on a downlink channel received by the terminal device before the first time period. That is, the terminal device may perform initial frequency estimation based on the downlink channel in the first slot and determine the first compensation value accordingly. Furthermore, all time domain units in the first frequency compensation segment may be pre-compensated based on the first compensation value. As described above, when starting transmission, assuming that the path loss and Doppler shift in the uplink transmission and the downlink transmission are consistent, the terminal device may determine the first compensation value based on the channel response estimated by the downlink. Based on the first compensation value, the terminal device may perform frequency offset pre-compensation for all time domain units in the first frequency compensation segment. In this case, the first slot starting from the first frequency compensation segment and subsequent slots or symbols within the slot have the initial frequency offset compensation value.

[0146] In some embodiments, the terminal device may determine the compensation value of each subsequent frequency compensation segment based on the compensation value of the first frequency compensation segment. That is, if the first frequency compensation segment is a frequency compensation segment other than the first frequency compensation segment, the first compensation value may be determined based on the second compensation value corresponding to the second frequency compensation segment preceding the first frequency compensation segment. In this case, all time domain units in the first frequency compensation segment are pre-compensated based on the first compensation value. The second frequency compensation segment preceding the first frequency compensation segment refers to the second frequency compensation segment being generated before the first frequency compensation segment in the time domain. The terminal device first pre-compensates the second frequency compensation segment, and then pre-compensates the first frequency compensation segment. The second frequency compensation segment may be the first frequency compensation segment in the first time period, or may be a frequency compensation segment other than the last frequency compensation segment.

[0147] In one possible embodiment, when the terminal device performs frequency offset compensation for the first frequency compensation segment, the terminal device can perform pre-compensation based on the estimation result of the previous frequency compensation segment. Specifically, the terminal device can estimate a first compensation value for the first frequency compensation segment based on the frequency offset estimated in the previous frequency compensation segment. For example, for the three frequency compensation segments in FIG. 7, the second frequency compensation segment can determine a corresponding compensation value based on the compensation result of the first frequency compensation segment, and the third frequency compensation segment can determine a corresponding compensation value based on the compensation result of the second frequency compensation segment.

[0148] In another possible embodiment, after the terminal device performs pre-compensation for the first frequency compensation segment, the corresponding compensation values ​​for each subsequent frequency compensation segment can all be determined based on the compensation result of the first frequency compensation segment.

[0149] For example, a terminal device may perform pre-compensation on the first frequency compensation segment after channel estimation or frequency offset estimation based on multiple DMRS symbols in the first slot. Each subsequent frequency compensation segment may add one phase continuity adjustment factor when compensating based on the frequency offset estimation result of the previous segment, thereby performing frequency compensation in the subsequent frequency compensation segment. That is, for the first subsequent frequency compensation segment, the first compensation value may be determined based on the compensation result of the previous segment and the adjustment factor. In a possible embodiment, the adjustment factor may be related to the first frequency compensation segment and its position within the first time period. For example, if the first time period includes M first frequency compensation segments, the adjustment factor of the i-th first frequency compensation segment among the M first frequency compensation segments may be

number

number

[0150] In some embodiments, a terminal device can perform frequency offset estimation based on the first time domain unit of each frequency compensation segment to obtain a corresponding compensation value. If the time domain unit is a slot, the first slot of each frequency compensation segment can be used as a frequency offset estimation slot to compensate for the frequency offset after that segment. As described above, in a DMRS bundling window, the time that disrupts power consistency and phase continuity is the interval between multiple frequency compensation segments. Because the phase is discontinuous, each frequency compensation segment may correspond to a different compensation value.

[0151] In one possible embodiment, the first frequency compensation segment may be any frequency compensation segment within the first time period. The terminal device may perform frequency offset estimation using consecutive DMRS symbols during each frequency compensation segment or in the first slot of each frequency compensation segment. That is, the first compensation value may be determined based on one or more DMRS symbols in the first slot of the first frequency compensation segment. Based on the first compensation value, the terminal device may perform pre-compensation for other slots after the first frequency compensation segment.

[0152] Taking the first time period as an example of one DMRS bundling window, when the terminal device performs frequency offset estimation based on the DMRS symbol, it can determine the frequency offset within the first frequency compensation segment based on the following method.

[0153] Assuming that the DMRS bundles N slots and each frequency compensation segment is associated with M(i) slots, frequency offset estimation is performed for some symbols occupied by the DMRS in M(i,1) slots of each frequency compensation segment, where M(i,1) represents the first slot of the ith frequency compensation segment.

[0154] The terminal device transmits the uplink after performing an inverse fast Fourier transform (IFFT) at N points. Within the first time slot for the uplink, the multiple consecutive DMRS pilot signals s(k) in M(i,1) are as follows:

number

[0155] However, X nis the DMRS pilot signal, N is the number of sample points of the DMRS pilot symbol, n represents the number of N sample points in the time domain, k represents the number of N sample points in the frequency domain, exp() represents the exponential function with base e, and j represents the imaginary unit. The parameters already defined will not be described in detail below. The time-domain impulse response h(τ,t) of the multipath channel can be expressed as follows:

number

[0156] where ip is the number of multipaths and h i (t) is the impulse response of the ith path, and τ i is the time delay of the ith path, and δ(τ-τ i ) is the impulse response function.

[0157] Within the DMRS bundling window, an intervening event may cause a phase discontinuity, requiring the terminal device to estimate and compensate for the frequency offset for each frequency compensation segment individually. The terminal device can perform frequency offset estimation for multiple DMRS symbols in the first slot within a frequency compensation segment, and the estimated frequency offset is used for frequency offset compensation in subsequent slots.

[0158] Specifically, the corresponding frequency offset is defined as Δf. A 2N-point sequence is obtained based on the multiple pilot signals in the first slot.

number

[0159] where r(k) represents a sequence of length 2N, k represents a number, and n(k) represents noise.

[0160] The nth element R of the first N-point discrete Fourier transform (DFT) 1n is as follows:

number

[0161] nth element R of the second half of the N-point DFT 2n is as follows:

number

[0162] Finally, several symbols are averaged and optimized to estimate the frequency offset.

number

[0163] however,

number

number

number

number

[0164] After each frequency compensation segment estimates the frequency offset, pre-compensation can be performed on other slots or symbol bits in the segment, thereby maintaining phase and power continuity. The compensation value corresponding to each frequency compensation segment may be determined based on the frequency offset. For example, the slot signal after the i-th frequency compensation segment may be pre-multiplied by a pre-compensation number.

number

[0165] where Δf i represents the frequency offset of the i-th frequency compensation segment.

[0166] Phase discontinuity may occur due to TA adjustments or other events occurring in multiple frequency compensation segments. When the compensation value of the first frequency compensation segment is determined based on the compensation result of the previous frequency compensation segment, an adjustment parameter can be added based on the pre-compensation number. The adjustment parameter is the aforementioned adjustment coefficient. For example, the slot after the i-th UL segment is pre-multiplied by the pre-compensation number.

number

[0167] however,

number

[0168] In some embodiments, the frequency offset estimation and compensation process for each frequency compensation segment may be the same. For example, all frequency offset estimations within the first time slot use the compensation value from the first frequency compensation segment. Also, for example, all frequency compensation segments use the compensation value from the first slot, which is used for the frequency offset compensation scheme for subsequent slots.

[0169] The above describes pre-compensation of multiple frequency compensation segments with reference to various methods for determining the first compensation value. For ease of understanding, several possible compensation methods will be described in detail below with reference to FIGS. 7 to 9. In FIGS. 7 to 9, the terminal device includes all three frequency compensation segments within a first time period in which it performs PUSCH repetitive transmission over 16 slots. The compensation methods for the three frequency compensation segments in FIGS. 7 and 9 are different, while the compensation method for the three frequency compensation segments in FIG. 8 is the same.

[0170] Referring to Figure 7, in the first frequency compensation segment, the terminal device performs initial frequency estimation based on the downlink channel. Based on the initial frequency estimation, the terminal device performs frequency offset pre-compensation for the slots of the first frequency compensation segment. In the second and third frequency compensation segments, the terminal device determines the first slot as the frequency offset estimation slot and obtains a compensation value. Based on the compensation value, the terminal device compensates for slots other than the first slot in the frequency compensation segment. That is, pre-compensation cannot be performed for the frequency offset estimation slot.

[0171] Referring to Figure 8, the first slots of the three frequency compensation segments are all frequency offset estimation slots, and the terminal device obtains the compensation value of the corresponding frequency compensation segment based on the frequency offset estimation slot, and compensates the slots other than the first slot in the frequency compensation segment.

[0172] Referring to FIG. 9, in the first frequency compensation segment, the terminal device can perform initial frequency estimation based on the downlink channel, and estimate the frequency offset using the first slot as a frequency offset estimation slot.

[0173] After the terminal device performs initial frequency estimation based on the downlink channel, all slots of the first frequency compensation segment can perform pre-compensation based on the determined first compensation value. Corresponding compensation values ​​for the second and third frequency compensation segments can be determined by adding adjustment factors based on the first compensation value. All slots of the second and third frequency compensation segments perform pre-compensation based on the determined compensation value. Therefore, all slots in the first time period are pre-compensated.

[0174] When the terminal device sets the first slot of the first frequency compensation segment as the frequency offset estimation slot, it performs pre-compensation for the other slots of the first frequency compensation segment based on the determined first compensation value. All slots of the second frequency compensation segment and the third frequency compensation segment similarly perform pre-compensation based on the first compensation value and adjustment coefficient. Therefore, all slots other than the first slot in the first time period perform pre-compensation.

[0175] Above, a method embodiment of the present application has been described in detail with reference to Figures 5 to 9. Hereinafter, an apparatus embodiment of the present application will be described in detail with reference to Figures 10 to 12. It should be understood that the description of the apparatus embodiment corresponds to the description of the method embodiment, so that the parts not described in detail can be referred to the previous method embodiment.

[0176] 10 is a structural schematic diagram of a wireless communication device according to an embodiment of the present application. The device 1000 may be any of the terminal devices described above. The device 1000 shown in FIG. 10 includes a determining unit 1010 and a compensating unit 1020.

[0177] The determining unit 1010 may be used to determine a plurality of frequency compensation segments within a first time period based on first information, where the first information is related to DMRS bundling for joint channel estimation, and the first time period includes a time-domain window corresponding to at least one DMRS bundling.

[0178] The compensation unit 1020 may be used to perform pre-compensation on an uplink channel corresponding to a first time period based on the plurality of frequency compensation segments.

[0179] Optionally, the first information is used to determine one or more of the following information: a time-domain location of the first time period; an event that disrupts phase continuity within the first time period; an A-TDW within the first time period; and a C-TDW within the first time period.

[0180] Optionally, the event that disrupts phase continuity within the first time period includes updating a TA, where the TA includes a common TA and / or a TA corresponding to the terminal device.

[0181] Optionally, the multiple frequency compensation segments are determined based on the A-TDW and / or C-TDW within the first time period, and the magnitude of the A-TDW and the magnitude of the C-TDW are dynamically adjusted based on the moving speed and / or antenna switching of the satellite in the NTN system.

[0182] Optionally, the time domain window corresponding to the DMRS bundling is determined based on the relative positions of the satellites and the terminal equipment in the NTN system.

[0183] Optionally, the relative position of the satellite and the terminal equipment includes an elevation angle of the terminal equipment relative to the satellite, and the duration T of the time domain window corresponding to the DMRS bundling satisfies the condition T=K×θ, where θ represents the elevation angle, K represents a proportionality coefficient, and K>0.

[0184] Optionally, the first time period includes a plurality of DMRS bundlings, and each frequency compensation segment in the plurality of frequency compensation segments corresponds to one or more of the DMRS bundlings, respectively.

[0185] Optionally, the first information is further used to indicate boundaries of a plurality of frequency compensation segments, and the determining unit 1010 is further used to determine whether to update the TA based on the boundaries of the plurality of frequency compensation segments.

[0186] Optionally, the plurality of frequency compensation segments includes a first frequency compensation segment, and the determining unit 1010 is further used to determine a first compensation value corresponding to the first frequency compensation segment, the first compensation value being related to a frequency offset within the first frequency compensation segment.

[0187] Optionally, the first compensation value is determined based on one or more of the following information: a time domain position of the first frequency compensation segment within the first time period; a downlink channel received by the terminal device prior to the first time period; one or more DMRS symbols of a first time domain unit within the first frequency compensation segment; a second compensation value corresponding to a second frequency compensation segment prior to the first frequency compensation segment; and an adjustment factor related to phase continuity of the first frequency compensation segment.

[0188] Optionally, the first frequency compensation segment is a first frequency compensation segment within a first time period, the first compensation value is determined based on a downlink channel received by the terminal device before the first time period, and all time domain units in the first frequency compensation segment perform pre-compensation based on the first compensation value.

[0189] Optionally, the first frequency compensation segment is a frequency compensation segment other than the first frequency compensation segment within the first time period, and the first compensation value is determined based on a second compensation value corresponding to a second frequency compensation segment preceding the first frequency compensation segment, and pre-compensation is performed on the first compensation value based on all time domain units in the first frequency compensation segment.

[0190] Optionally, the first compensation value is determined based on one or more DMRS symbols of a first time domain unit in the first frequency compensation segment, and time domain units other than the first time domain unit in the first frequency compensation segment are pre-compensated based on the first compensation value.

[0191] Optionally, the first compensation value is determined based on an adjustment factor related to phase continuity of the first frequency compensation segment, the adjustment factor related to the first frequency compensation segment and the position of the first frequency compensation segment within the first time period.

[0192] Optionally, the first time period includes M first frequency compensation segments, and the compensation value of the i-th first frequency compensation segment among the M first frequency compensation segments is:

number

number

[0193] Optionally, the frequency offset is related to a phase offset corresponding to the first frequency compensation segment, and the phase offset is determined based on one or more of a Doppler shift due to relative motion between the terminal equipment and the network equipment and a time drift associated with the terminal equipment and the network equipment.

[0194] Optionally, the first information is transmitted by one or more of DCI, RRC signaling, and SIB information.

[0195] Optionally, the apparatus 1000 may further include a transmitting unit, which is used for transmitting second information to the network equipment, and the second information is used for indicating whether the terminal equipment has the ability to support pre-compensation.

[0196] 11 is a structural schematic diagram of a wireless communication device according to another embodiment of the present application. The device 1100 may be any of the network devices mentioned above. The device 1100 shown in FIG. 11 includes a transmitting unit 1110.

[0197] The transmitting unit 1110 may be used to transmit first information to a terminal device, the first information being used by the terminal device to determine a plurality of frequency compensation segments within a first time period, the first information being related to DMRS bundling for joint channel estimation, the first time period including a time domain window corresponding to at least one DMRS bundling, and the plurality of frequency compensation segments being used by the terminal device to perform pre-compensation on an uplink channel corresponding to the first time period.

[0198] Optionally, the first information is used to determine one or more of the following information: a time-domain location of the first time period; an event that disrupts phase continuity within the first time period; an A-TDW within the first time period; and a C-TDW within the first time period.

[0199] Optionally, the event that disrupts phase continuity within the first time period includes updating a TA, where the TA includes a common TA and / or a TA corresponding to the terminal device.

[0200] Optionally, the multiple frequency compensation segments are determined based on the A-TDW and / or C-TDW within the first time period, and the magnitude of the A-TDW and the magnitude of the C-TDW are dynamically adjusted based on the moving speed and / or antenna switching of the satellite in the NTN system.

[0201] Optionally, the time domain window corresponding to the DMRS bundling is determined based on the relative positions of the satellites and the terminal equipment in the NTN system.

[0202] Optionally, the relative position of the satellite and the terminal equipment includes an elevation angle of the terminal equipment relative to the satellite, and the duration T of the time domain window corresponding to the DMRS bundling satisfies the condition T=K×θ, where θ represents the elevation angle, K represents a proportionality coefficient, and K>0.

[0203] Optionally, the first time period includes a plurality of DMRS bundlings, and each frequency compensation segment in the plurality of frequency compensation segments corresponds to one or more DMRS bundlings, respectively.

[0204] Optionally, the first information may be further used to indicate boundaries of a plurality of frequency compensation segments, and the apparatus 1100 may further include a determination unit, which may be used to determine whether to limit the update of the TA based on the boundaries of the plurality of frequency compensation segments.

[0205] Optionally, the first information is transmitted by one or more of DCI, RRC signaling, and SIB information.

[0206] Optionally, the apparatus 1100 further includes a receiving unit, which may be used to receive second information transmitted from the terminal equipment, and the second information is used to indicate whether the terminal equipment has the capability to support pre-compensation.

[0207] FIG. 12 shows a structural diagram of a communication device according to an embodiment of the present application. The dashed lines in FIG. 12 indicate that the unit or module is optional. The device 1200 can be used to implement the method described in the above method embodiment. The device 1200 can be a chip, a terminal device, or a network device.

[0208] The device 1200 may include one or more processors 1210. The processor 1210 can support the device 1200 in implementing the methods described in the method embodiments above. The processor 1210 may be a general-purpose processor or a special-purpose processor. For example, the processor may be a central processing unit (CPU). Alternatively, the processor may be another general-purpose processor, a digital signal processor (DSP), an application-specific integrated circuit (ASIC), a field programmable gate array (FPGA) or other programmable logic device, a discrete gate or transistor logic device, a discrete hardware component, or the like. A general-purpose processor may be a microprocessor, or the processor may be any conventional processor, or the like.

[0209] The apparatus 1200 may further include one or more memories 1220. The memories 1220 store programs that, when executed by the processor 1210, cause the processor 1210 to perform the methods described in the method embodiments above. The memory 1220 may be separate from the processor 1210 or may be integrated into the processor 1210.

[0210] The apparatus 1200 may further include a transceiver 1230. The processor 1210 may communicate with other devices or chips via the transceiver 1230. For example, the processor 1210 may transmit and receive data to and from other devices or chips via the transceiver 1230.

[0211] An embodiment of the present application further provides a computer-readable storage medium for storing a program, which can be applied to a terminal device or a network device according to the embodiment of the present application, and the program causes a computer to execute the method performed by the terminal device or the network device according to each embodiment of the present application.

[0212] In some embodiments, the computer-readable storage medium may be any available medium that can be read by a computer, or a data storage device that integrates one or more available media, such as a server, a data center, etc. The available medium may be a magnetic medium (e.g., a floppy disk, a hard disk, a tape), an optical medium (e.g., a digital versatile disk (DVD)), or a semiconductor medium (e.g., a solid state disk (SSD)).

[0213] An embodiment of the present application further provides a computer program product, the computer program product including a program that can be applied to a terminal device or a network device according to an embodiment of the present application, the program causing a computer to execute a method performed by the terminal device or the network device according to each embodiment of the present application.

[0214] The above embodiments may be implemented in whole or in part by software, hardware, firmware, or any combination thereof. When implemented in software, all or in part may be implemented in the form of a computer program product. The computer program product includes one or more computer instructions. When the computer program instructions are loaded and executed on a computer, they generate all or some of the procedures or functions described in the embodiments of the present application. The computer may be a general-purpose computer, a special-purpose computer, a computer network, or other programmable device. The computer instructions may be stored on a computer-readable storage medium or transmitted from one computer-readable storage medium to another. For example, the computer instructions may be transmitted from one website, computer, server, or data center to another website, computer, server, or data center via wire (e.g., coaxial cable, fiber optic, digital subscriber line (DSL)) or wireless (e.g., infrared, radio, microwave, etc.).

[0215] The embodiments of the present application further provide a computer program, which is applicable to the terminal device or network device according to the embodiments of the present application, and causes a computer to execute the method performed by the terminal device or network device according to each embodiment of the present application.

[0216] In this application, the terms "system" and "network" may be used interchangeably. Furthermore, the terms used in this application are used only to interpret specific embodiments of the present application and are not intended to limit the present application. The terms "first," "second," "third," "fourth," etc. in the specification, claims, and drawings of this application are used to distinguish between different objects, not to describe a particular order. Furthermore, the terms "include," "have," and any variations thereof are intended to cover a non-exclusive inclusion.

[0217] In the embodiments of the present application, the term "indicate" may refer to a direct indication, an indirect indication, or an association relationship. For example, when A indicates B, A may directly indicate B, e.g., indicate that B can be obtained by A, or A may indirectly indicate B, e.g., indicate C, indicate that B can be obtained by C, or indicate that there is an association relationship between A and B.

[0218] In the embodiments of the present application, the term "correspondence" may indicate that there is a direct or indirect correspondence relationship between the two, or that there is an association relationship between the two, or a relationship such as showing and being shown, setting and being set, etc.

[0219] In the embodiments of the present application, "predefined" or "preconfigured" may be realized by pre-storing a corresponding code, form, or format capable of instructing related information in a device (including, for example, a terminal device and a network device), and the present application does not limit the specific implementation form. For example, predefined may refer to being defined in a protocol.

[0220] In the embodiments of the present application, the "protocol" may refer to a standard protocol in the communications field, and may include, for example, an LTE protocol, an NR protocol, and related protocols applied to future communications systems, but is not limited thereto in the present application.

[0221] In the embodiments of the present application, determining B based on A does not mean determining B based only on A, but B may be determined based on A and / or other information.

[0222] In the examples of the present application, the term "and / or" simply describes the relationship between related objects and indicates that three types of relationships exist, for example, A and / or B includes three cases: the presence of only A, the simultaneous presence of A and B, and the presence of only B. In addition, in this specification, the symbol " / " generally indicates that the related objects before and after it are in an "or" relationship.

[0223] In various embodiments of the present application, the order of the numbers of the above processes does not indicate the order of execution, and the order of execution of each process should be determined based on its function and inherent logic, and does not constitute any limitation on the implementation process of the embodiments of the present application.

[0224] It should be understood that in some embodiments of the present application, the disclosed systems, devices, and methods may be realized in other forms. For example, the device embodiments described above are merely exemplary, and the segmentation of the units is merely one logical function segmentation. In actual implementation, other segmentation schemes may be adopted, for example, multiple units or components may be combined or integrated into another system, or some features may be ignored or not implemented. Furthermore, the shown or discussed mutual couplings or direct couplings or communication connections may be indirect couplings or communication connections via some interfaces, devices, or units, and may be electrical, mechanical, or other forms.

[0225] The units described as separate components may or may not be physically separate, and as units, the components represented may or may not be physical units, i.e., they may be located in one place or distributed across multiple network units. Some or all of the units can be selected based on actual needs to achieve the objectives of the means of this embodiment.

[0226] Furthermore, each functional unit in each embodiment of the present application may be integrated into one processing unit, each unit may exist physically separately, or two or more units may be integrated into one unit.

[0227] Although specific embodiments of the present application have been described above, the scope of protection of the present application is not limited thereto, and all modifications and substitutions that can be easily conceived by those skilled in the art without departing from the technical scope disclosed in the present application fall within the scope of protection of the present application. Therefore, the scope of protection of the present application should be in accordance with the scope of protection of the claims. [Explanation of symbols]

[0228] 100 Communication Systems 110 Network Equipment 120 Terminal Equipment 200 Satellite Radio Access Network 210 satellite 220 Service Link 230 Feeder Link 240 Terminal Equipment 250 Gateway 260 Network 300 Satellite Radio Access Network 310 satellite 312 Base Station 320 Service Link 330 Feeder Link 340 Terminal Equipment 350 Gateway 360 Network 1000 devices 1010 Decision Unit 1020 Compensation Units 1100 equipment 1110 Transmitting Unit 1200 equipment 1210 processor 1220 memory 1230 Transmitter / Receiver

Claims

1. 1. A method for wireless communication, comprising: determining, by the terminal device, a plurality of frequency compensation segments within a first time period based on first information, the first information relating to demodulation reference signal (DMRS) bundling for joint channel estimation, the first time period including a time domain window corresponding to at least one of the DMRS bundlings; and a step in which the terminal device performs pre-compensation on an uplink channel corresponding to the first time period based on the plurality of frequency compensation segments.

2. The first information is a time domain position of the first time period; an event that disrupts phase continuity within the first time period; an actual time domain window A-TDW within the first time period; and 2. The method of claim 1, wherein one of the configured time domain windows C-TDW within the first time period is used to determine the plurality of pieces of information.

3. 3. The method of claim 2, wherein an event that disrupts phase continuity within the first time period includes updating a timing advance (TA), the TA including a common TA and / or a TA corresponding to the terminal equipment.

4. 3. The method of claim 2, wherein the plurality of frequency compensation segments are determined based on the A-TDW and / or the C-TDW within the first time period, and the magnitude of the A-TDW and the magnitude of the C-TDW are dynamically adjusted based on the moving speed and / or antenna switching of a satellite in a non-terrestrial network (NTN) system.

5. The method according to any one of claims 1 to 4, characterized in that the time domain window corresponding to the DMRS bundling is determined based on the relative position of the terminal device and a satellite in an NTN system.

6. The relative position of the satellite and the terminal device includes an elevation angle of the terminal device with respect to the satellite, and the duration T of a time domain window corresponding to the DMRS bundling is The condition T = K × θ is satisfied, 6. The method of claim 5, wherein θ represents the elevation angle, K represents a proportionality coefficient, and K>0.

7. 7. The method according to claim 1, wherein the first time period includes a plurality of the DMRS bundlings, and each frequency compensation segment in the plurality of frequency compensation segments corresponds to one or more of the DMRS bundlings.

8. The first information is further used to indicate boundaries of the plurality of frequency compensation segments, and the method further comprises:

8. The method according to claim 1, further comprising the step of: the terminal device determining whether to update a time interval (TA) based on boundaries of the plurality of frequency compensation segments.

9. The plurality of frequency compensation segments includes a first frequency compensation segment, and before the terminal device performs pre-compensation on an uplink channel corresponding to the first time period based on the plurality of frequency compensation segments, the method includes:

9. The method according to claim 1, further comprising a step of the terminal device determining a first compensation value corresponding to the first frequency compensation segment, the first compensation value being related to a frequency offset within the first frequency compensation segment.

10. The first compensation value is a time domain position within the first time period of the first frequency compensation segment; a downlink channel received by the terminal device before the first time period; one or more DMRS symbols of a first time domain unit within the first frequency compensation segment; a second compensation value corresponding to a second frequency compensation segment preceding the first frequency compensation segment; and 10. The method of claim 9, wherein the first frequency compensation segment is determined based on one or more of an adjustment factor related to phase continuity of the first frequency compensation segment.

11. 11. The method of claim 10, wherein the first frequency compensation segment is a first frequency compensation segment within the first time period, the first compensation value is determined based on a downlink channel received by the terminal device before the first time period, and all time domain units in the first frequency compensation segment perform the pre-compensation based on the first compensation value.

12. 11. The method of claim 10, wherein the first frequency compensation segment is a frequency compensation segment other than a first frequency compensation segment within the first time period, the first compensation value is determined based on a second compensation value corresponding to a second frequency compensation segment preceding the first frequency compensation segment, and all time domain units in the first frequency compensation segment perform the pre-compensation based on the first compensation value.

13. 11. The method of claim 10, wherein the first compensation value is determined based on one or more DMRS symbols of a first time domain unit in the first frequency compensation segment, and time domain units other than the first time domain unit in the first frequency compensation segment perform the pre-compensation based on the first compensation value.

14. 11. The method of claim 10, wherein the first compensation value is determined based on an adjustment factor related to phase continuity of the first frequency compensation segment, the adjustment factor related to the first frequency compensation segment and a position of the first frequency compensation segment within the first time period.

15. The first time period includes M first frequency compensation segments, and a compensation value of an i-th first frequency compensation segment among the M first frequency compensation segments is [Equation 1] where: [Equation 2] 15. The method of claim 14, wherein Δf represents an adjustment factor that keeps the phase of the i-th first frequency compensation segment continuous, Δf represents a frequency offset of the i-th first frequency compensation segment, and j represents an imaginary unit.

16. The frequency offset is related to a phase offset corresponding to the first frequency compensation segment, the phase offset being: Doppler shift due to relative motion between the terminal device and the network device; 10. The method of claim 9, wherein the time drift is determined based on one or more of the terminal equipment and a time drift associated with the network equipment.

17. 17. The method according to any one of claims 1 to 16, characterized in that the first information is transmitted by one or more of the following: Downlink Control Information (DCI), Radio Resource Control (RRC) signaling, System Message Block (SIB) information.

18. 18. The method of claim 1, further comprising the step of the terminal device transmitting second information to a network device, the second information being used to indicate whether the terminal device has the capability to support the pre-compensation.

19. 1. A method for wireless communication, comprising: The method includes a step of transmitting first information from a network device to a terminal device, the first information being used by the terminal device to determine a plurality of frequency compensation segments within a first time period, the first information being related to demodulation reference signal (DMRS) bundling for joint channel estimation, the first time period including a time domain window corresponding to at least one of the DMRS bundlings; The method for wireless communication, wherein the plurality of frequency compensation segments are used by the terminal device to perform pre-compensation on an uplink channel corresponding to the first time period.

20. The first information is a time domain position of the first time period; an event that disrupts phase continuity within the first time period; an actual time domain window A-TDW within the first time period; and 20. The method of claim 19, wherein one of the configured time domain windows C-TDW within the first time period is used to determine the plurality of pieces of information.

21. 21. The method of claim 20, wherein an event that disrupts phase continuity within the first time period includes updating a timing advance (TA), the TA including a common TA and / or a TA corresponding to the terminal device.

22. The method of claim 20, characterized in that the plurality of frequency compensation segments are determined based on the A-TDW and / or C-TDW within the first time period, and the magnitude of the A-TDW and the magnitude of the C-TDW are dynamically adjusted based on the moving speed and / or antenna switching of a satellite in a non-terrestrial network (NTN) system.

23. The method according to any one of claims 19 to 22, characterized in that the time domain window corresponding to the DMRS bundling is determined based on the relative position of the terminal device and a satellite in an NTN system.

24. The relative position of the satellite and the terminal device includes an elevation angle of the terminal device with respect to the satellite, and the duration T of a time domain window corresponding to the DMRS bundling is The condition T = K × θ is satisfied, 24. The method of claim 23, wherein θ represents the elevation angle, K represents a proportionality coefficient, and K>0.

25. 25. The method of claim 19, wherein the first time period includes a plurality of the DMRS bundlings, and each frequency compensation segment in the plurality of frequency compensation segments corresponds to one or more of the DMRS bundlings.

26. The first information is further used to indicate boundaries of the plurality of frequency compensation segments, and the method further comprises:

26. The method of claim 19, further comprising the step of: the network equipment determining whether to restrict TA updates based on boundaries of the plurality of frequency compensation segments.

27. 27. The method according to any one of claims 19 to 26, characterized in that the first information is transmitted by one or more of Downlink Control Information (DCI), Radio Resource Control (RRC) signaling, System Message Block (SIB) information.

28. 28. The method of claim 19, further comprising receiving, by the network equipment, second information sent from a terminal device, the second information being used to indicate whether the terminal device has the capability to support the pre-compensation.

29. 1. An apparatus for wireless communication, comprising: The device is a terminal device, and the terminal device comprises: a determining unit for determining a plurality of frequency compensation segments within a first time period based on first information, the first information relating to demodulation reference signal (DMRS) bundling for joint channel estimation, the first time period including a time domain window corresponding to at least one of the DMRS bundlings; a compensation unit for performing pre-compensation on an uplink channel corresponding to the first time period based on the plurality of frequency compensation segments.

30. 1. An apparatus for wireless communication, the apparatus being a network device, the network device comprising: a transmitting unit for transmitting first information to a terminal device, the first information being used by the terminal device to determine a plurality of frequency compensation segments within a first time period, the first information being related to demodulation reference signal (DMRS) bundling for joint channel estimation, the first time period including a time domain window corresponding to at least one of the DMRS bundlings; The apparatus for wireless communication, wherein the plurality of frequency compensation segments are used by the terminal device to perform pre-compensation on an uplink channel corresponding to the first time period.

31. A communication device comprising: a memory; and a processor, wherein the memory is used to store a program; and the processor is used to call the program in the memory and execute the method of any one of claims 1 to 28.

32. A communication device, characterized in that it comprises a processor for calling a program from a memory to perform the method of any one of claims 1 to 28.

33. A chip comprising a processor for causing a device to which the chip is attached to execute the method according to any one of claims 1 to 28 by calling a program from a memory.

34. A computer-readable storage medium having stored thereon a program for causing a computer to carry out the method according to any one of claims 1 to 28.

35. A computer program product, characterized in that it comprises a program for causing a computer to carry out the method according to any one of claims 1 to 28.

36. A computer program, characterized in that when run on a computer, it causes the computer to carry out the method according to any one of claims 1 to 28.

Images