Method for tracking reference signal (TRS) enhancements

Abstract

Some embodiments include apparatuses, methods, and computer program products for tracking reference signal (TRS) support for high-speed use cases of 5G communications in a single frequency network (SFN), where a user equipment (UE) can measure a Doppler shift of a combined signal from two or more transmission reception points (TRPs) of the 5G communication system. A 5G NodeB (gNB) can transmit periodic, semi-persistent (SP), or aperiodic TRSs with high measurement density, which the UE uses to measure the Doppler shift of the combined signal. For example, the gNB can: trigger the aperiodic TRS based on a downlink assignment; and / or schedule to transmit a semi-persistent TRS or a periodically reduced periodicity TRS using lower layer signaling. In some embodiments, the gNB can measure the Doppler shift based on an uplink signal and transmit the TRS based on pre-compensating the Doppler frequency.

Description

Background Technology Technical Field

[0002] The described implementation scheme involves 5G wireless communication as a whole, including high-speed applications.

[0003] Related fields

[0004] 5G wireless communication systems include a Channel State Information-Reference Signal (CSI-RS) used to track User Equipment (UE) connected to the 5G wireless network via a 5G NodeB (gNB) or 5G base station. This CSI-RS may include a Tracking Reference Signal (TRS) to facilitate accurate time and frequency offset tracking. Challenges arise in high-speed use cases when the 5G wireless network employs a Single-Frequency Network (SFN) mode. Summary of the Invention

[0005] A 5G Node B (gNB) can transmit a periodic Tracking Reference Signal (TRS) from the Channel State Information-Reference Signal (CSI-RS) to a User Equipment (UE) using that periodic TRS to determine the Doppler offset. The UE uses this Doppler offset to decode data in the 5G transmission (e.g., the Physical Downlink Shared Channel (PDSCH)) that may have been offset in frequency due to the Doppler effect. In high-speed use cases, such as high-speed rail scenarios, where the UE is moving at high speed between two or more Transmitter Receiver Points (TRPs) (e.g., gNBs), the 5G wireless network employs a Single-Frequency Network (SFN) mode to reduce the number of handovers experienced by the UE. In SFN mode, the UE receives a combined signal at the same frequency, where the combined signal includes contributions from at least two TRPs. When the UE uses the periodic TRS to determine the Doppler offset and applies that Doppler offset to the combined TRP signal, decoding fails because the Doppler offset of the combined signal changes much faster at high speeds compared to the Doppler offset of a single TRP signal at high speeds. In some solutions, the periodicity of periodic TRS is reduced, resulting in more frequent transmission of periodic TRS. However, this increases both network power consumption and UE power consumption.

[0006] Some implementations include apparatus, methods, and computer program products supporting TRS for high-speed use cases of 5G communications in an SFN, wherein a UE can measure the Doppler offset of a combined signal from two or more TRPs from the 5G communication system. The gNB can transmit periodic, semi-permanent (SP), or aperiodic TRSs with high measurement density, which the UE uses to measure the Doppler offset of the combined signal. For example, the gNB can: trigger the aperiodic TRS based on downlink allocation; and / or use lower-layer signaling to schedule the transmission of semi-permanent TRSs or periodically reduced TRSs. In some implementations, the gNB can measure the Doppler offset based on uplink signals and transmit periodic TRSs based on a pre-compensated Doppler frequency (e.g., with a phase shift).

[0007] Some implementations include a gNB, for example, receiving an uplink reference signal from a user equipment (UE) (such as a smartphone), and making a first determination based at least on the received uplink reference signal: the Doppler offset has met a threshold. Meeting this threshold indicates that the Doppler offset has changed significantly compared to a previous Doppler offset, and that the UE may be moving at high speed. Based on this first determination, some implementations include using downlink allocation or a lower-layer protocol to enable periodic, SP, or aperiodic TRS with high measurement density, and transmitting the periodic, SP, or aperiodic TRS to the UE in the SFN. To transmit the aperiodic TRS, some implementations include triggering the aperiodic TRS based on the downlink allocation, wherein the aperiodic TRS shares one or more quasi-co-located (QCL) parameters (e.g., sharing the same beam) with the Physical Downlink Shared Channel (PDSCH) signal triggered by the downlink allocation, wherein the aperiodic TRS enables the UE to decode the PDSCH signal, which includes a combined signal from the gNB in ​​the SFN and a second gNB of the device.

[0008] Some implementations include determining a time slot offset for an aperiodic TRS, wherein the time slot offset is the same as the time slot offset of the PDSCH signal, transmitting a second consecutive time slot comprising one or more aperiodic TRSs, and receiving a HARQ-ACK signal based on the last symbol of the last aperiodic TRS of the one or more aperiodic TRSs. Some implementations include determining a time slot offset for an aperiodic TRS, wherein the time slot offset is different from the time slot offset of the PDSCH signal, transmitting an aperiodic TRS in a first time slot, transmitting a second consecutive time slot comprising one or more aperiodic TRSs, and receiving a HARQ-ACK signal based on the last symbol of the PDSCH signal.

[0009] Some implementations include using a Media Access Control (MAC) element (CE) to activate the SP-TRS when the Doppler offset of the combined signal in the SFN changes rapidly. The minimum periodicity of the SP-TRS is less than or equal to the periodicity of the periodic TRS. When the Doppler offset no longer changes rapidly, some implementations include using the MAC CE to deactivate the SP-TRS.

[0010] When the Doppler offset used for combining signals changes rapidly, some implementations include using MAC CE or downlink control information (DCI) to reduce the periodicity of the periodic TRS; determining that the second Doppler offset no longer changes rapidly based on a second uplink reference signal received from the UE; and using MAC CE or DCI to increase the periodicity of the periodic TRS. Attached Figure Description

[0011] The accompanying drawings, which are incorporated herein and form part of the specification, illustrate the disclosed contents and, together with the specification, further serve to explain the principles of this disclosure and enable those skilled in the art to make and use it.

[0012] Figure 1A An exemplary system with a single transmit-receive point (TRP) is shown according to some embodiments of this disclosure.

[0013] Figure 1B An exemplary system in a single-frequency network (SFN) according to some embodiments of the present disclosure is shown.

[0014] Figure 2 The diagram illustrates the Doppler shift variations for single and combined TRP signals according to some embodiments of this disclosure.

[0015] Figure 3 A block diagram of an exemplary wireless system for an enhanced TRS in an SFN having combined signals, according to some embodiments of the present disclosure, is shown.

[0016] Figure 4 A non-periodic tracking reference signal (TRS) according to some embodiments of this disclosure is shown.

[0017] Figure 5 An exemplary wireless system for transmitting an enhanced TRS in an SFN having combined signals, according to some embodiments of the present disclosure, is shown.

[0018] Figure 6 An exemplary wireless system method for receiving an enhanced TRS in an SFN having combined signals, according to some embodiments of the present disclosure, is shown.

[0019] Figure 7An electronic device for implementing periodic TRS based on pre-compensated Doppler shift is shown according to some embodiments of the present disclosure.

[0020] Figure 8 A method for transmitting periodic TRS based on pre-compensated Doppler offset in an exemplary wireless system according to some embodiments of the present disclosure is shown.

[0021] Figure 9 A method for receiving periodic TRS based on pre-compensated Doppler is shown according to some embodiments of the present disclosure.

[0022] Figure 10 An electronic device for implementing periodic TRS based on pre-compensated Doppler shift in non-SFN measurements is shown according to some embodiments of the present disclosure.

[0023] Figure 11 It is an exemplary computer system for implementing some implementation schemes or parts thereof.

[0024] This disclosure is described with reference to the accompanying drawings. In the drawings, the same reference numerals generally indicate the same or similarly functional elements. Furthermore, the leftmost numeral of the reference numerals generally appears first in the drawings. Detailed Implementation

[0025] Wireless communication systems supporting high-speed use cases in single-frequency network (SFN) mode encounter problems due to Doppler shift. For example, electronic devices of users moving on high-speed tracks may struggle to maintain wireless service provided by the wireless communication system. Figure 1A An exemplary system 100 with a single transmit / receive point (TRP) (such as a 5G node B (gNB)) is shown according to some embodiments of the present disclosure. Figure 1A This is an example of a non-SFN system where User Equipment (UE) 120 in a moving vehicle communicates with TRP 110 via beam 115. UE 120 receives a periodic tracking reference signal (TRS) from TRP 110 and uses the periodic TRS to measure Doppler offset. UE 120 uses this Doppler offset to decode Physical Downlink Shared Channel (PDSCH) signals transmitted from TRP 110, which may be offset in frequency or phase due to the Doppler effect.

[0026] Figure 1BAn exemplary system 130 in an SFN according to some embodiments of this disclosure is illustrated. The 5G wireless network includes two or more TRPs, but only TRP 140 and TRP 150 are depicted. Both TRP 140 and TRP 150 communicate with UE 135 located in a high-speed orbit on a single frequency via beams 145 and 155, respectively. Therefore, UE 135 receives a combined signal from both TRP 140 and TRP 150. In some embodiments, there may be more than two TRPs (e.g., more than two gNBs).

[0027] Figure 2 The results show the data based on UE speed, maximum Doppler offset, and... Figure 1B Figures 230 and 260 show the simulated Doppler offset variations of single and combined TRP signals at distances Ds 160 and Dmin 170, respectively. These Doppler offset measurements from TRP 140 and TRP 150 do not change rapidly and are therefore fairly accurate in decoding and acquiring downlink data. However, Figure 200 shows that the Doppler offset of the combined signal from TRP 140 and TRP 150 changes rapidly. Some solutions involve reducing the periodicity of the periodic TRC, making the periodic TRC sent more frequently, but those solutions increase the power consumption of the network (e.g., TRP 140 and TRP 150) and UE 135. UE 135 can be a computing electronic device, such as a smartphone, a cellular phone, and for simplicity, may include other computing devices, including but not limited to laptops, desktop computers, tablets, personal assistants, routers, monitors, televisions, printers, and accessories.

[0028] Some implementations include TRS-supported apparatus, methods, and computer program products for high-speed use cases of 5G communications in SFN, wherein the user equipment (UE) can measure the Doppler shift of a combined signal from two or more TRPs from the 5G communication system. Figure 3 A block diagram of an exemplary wireless system 300 for an enhanced TRS in an SFN having combined signals, according to some embodiments of the present disclosure, is shown. For convenience and not limitation, it may be utilized Figure 1B To describe the elements Figure 3 .

[0029] For example, system 300 could be Figure 1BThe TRP 140, TRP 150, or UE 135 may be used, where the TRP can be a gNB. System 300 may include a processor 310, a transceiver 320, a communication infrastructure 330, a memory 335, and an antenna 325, which together perform the following operations: enabling TRS support for high-speed use cases of 5G communication in the SFN. The transceiver 320 transmits and receives 5G wireless communication signals and may be coupled to the antenna 325. The communication infrastructure 330 may be a bus. The memory 335 may include random access memory (RAM) and / or cache, and may include control logic components (e.g., computer software), computer instructions, and / or data. When executing computer instructions, the processor 310 may be configured to perform the functionality described herein to resolve the Doppler effect of the TRS signal. The antenna 325 coupled to the transceiver 320 may include one or more antennas, which may be the same or different types.

[0030] To address the challenge of UEs measuring the rapidly changing Doppler offset of combined signals, the gNB can transmit periodic or aperiodic TRS with high measurement density, which the UE uses to measure the Doppler offset of the combined signals. For example, the gNB can trigger the aperiodic TRS based on downlink allocation or higher-layer signaling. In another example, the gNB can use lower-layer signaling to schedule the transmission of semi-permanent (SP)-TRS or periodically decreasing TRS. In some implementations, Channel State Information-Reference Signal (CSI-RS) is used to transmit the TRS. In some implementations, Demodulation Reference Signal (DMRS) can be used to transmit the TRS.

[0031] In some implementations, the UE measures Doppler offset based on aperiodic TRS based on downlink allocation (e.g., physical downlink control channel (PDCCH)). For example, the gNB may indicate in the downlink control information (DCI) of the PDCCH signal that one or more aperiodic TRSs can be transmitted in the same beam (e.g., with the same quasi-co-address (QCL)) sharing the physical downlink channel (PDSCH signal), wherein the PDSCH signal is triggered by the same downlink allocation (e.g., the same PDCCH).

[0032] Figure 4 A non-periodic TRS according to some embodiments of this disclosure is illustrated. For convenience, and not limitation, elements of the preceding figures may be used to describe the data. Figure 4 In some implementations, downlink allocation transmitted by the gNB can be based on, as needed, such as... Figure 4The diagram shows a 1-slot format, a 2-slot format, or both. Schematic 400 depicts triggering scheme 1 including a PDCCH 405, which indicates a slot offset 415 between the PDCCH 405 and a slot including a first aperiodic TRS 445a. In triggering scheme 1, the slot offset 415 is also the same for PDSCH 420 triggered by PDCCH 405. PDSCH 420 includes aperiodic TRSs 445a to 445f, the second slot 425 includes one or more aperiodic TRSs 445g to 445l, and the processing delay 430 represents the delay before the UE transmits ACK 440 (e.g., HARQ / ACK). Figure 4 As shown, TRS 445a to 445f and TRS 445g to 1 are carried by predetermined corresponding resource elements, which can be indicated in the PDCCH.

[0033] During operation, Figure 1B The TRP 140 can determine, based on uplink reference signals (e.g., SRS, uplink DMRS), that the Doppler offset is changing rapidly and the UE may be moving at high speed. In response to this determination, the TRP 140 transmits PDCCH405. Figure 1B UE 135 receives PDCCH 405 and at least determines that there are two consecutive time slots including aperiodic TRS 445a to 445l and a time slot offset 415, which indicates that the time slot includes the first aperiodic TRS 445a. As an example, UE 135 accesses PDSCH 420 and buffers data from PDSCH 420, which may include combined signals from TRP 140 and TRP 150. In some implementations, there may be more than two TRPs (e.g., more than two gNBs). Once UE 135 determines the Doppler offset based on one or more of the aperiodic TRS 445a to 445f, UE 135 uses the Doppler offset to decode the buffered data. For example, UE 135 may use one or more of the aperiodic TRS 445a to 445f of PDSCH 420 to determine the Doppler offset. In some implementations, UE 135 (e.g., UE 135, processor 310 of system 300) measures the average Doppler measurement based on one or more of the aperiodic TRS 445a to 445f. UE 135 processes the information and uses the last symbol of the last aperiodic TRS 445l as the basis for processing these confirmations. In some implementations, UE 135 uses one or more of the aperiodic TRS 445g to 445l to calculate the average Doppler offset measurement.

[0034] In some embodiments, UE 135 uses one or more aperiodic TRS 445a to 445f instead of periodic TRS to measure Doppler shift. In some embodiments, UE 135 uses one or more aperiodic TRS 445 along with periodic TRS (not shown) to measure Doppler shift (e.g., including Doppler shift measurements based on periodic TRS to determine the average Doppler shift).

[0035] Schematic diagram 450 depicts triggering scheme 2 including PDCCH 455, which indicates a time slot offset 465 between PDCCH 455 and time slots including first aperiodic TRS 495a to f. In triggering scheme 2, time slot offset 465 is different from the time slot offset of PDSCH 475, and therefore, PDSCH 475 is located in a second consecutive time slot. PDSCH 475 is also triggered by PDCCH 455. First time slot 470 includes aperiodic TRS 495a to 495f, PDSCH 475 includes one or more aperiodic TRS 495g to 495l, and processing delay 480 represents the delay before transmitting ACK 490 (e.g., HARQ / ACK). For example, Figure 1B TRP 140 can transmit PDCCH 455. UE 135 in Figure 1 receives PDCCH 455 and at least determines that there are two consecutive time slots including aperiodic TRS 495a to 495l and a time slot offset 465, which indicates that the time slot includes the first aperiodic TRS 495a. As an example, UE 135 accesses PDSCH 475 and buffers data from PDSCH 475, which may include combined signals from TRP 140 and TRP 150.

[0036] Once UE 135 determines the Doppler offset based on one or more of the aperiodic TRS 495a to 495l, UE 135 uses the Doppler offset to decode the buffered data. For example, UE 135 can use the aperiodic TRS 495 of PDSCH 475 to determine the Doppler offset. In some embodiments, UE 135 (e.g., UE 135, processor 310 of system 300) measures the average Doppler measurement based on one or more of the aperiodic TRS 495a to 445l. UE 135 processes the information and uses the last symbol of PDSCH 475 as the basis for processing these confirmations. In some embodiments, UE 135 uses one or more of the aperiodic TRS 495g to 495f to calculate the average Doppler offset measurement.

[0037] In some embodiments, UE 135 uses one or more aperiodic TRS 495 instead of periodic TRS to measure Doppler offset. In some embodiments, UE 135 uses one or more aperiodic TRS 495g to 495l along with periodic TRS to measure Doppler offset (e.g., including Doppler offset measurements based on periodic TRS to determine the average Doppler offset).

[0038] Figure 5 A method 500 for transmitting an enhanced TRS in an SFN having combined signals, according to some embodiments of the present disclosure, is illustrated. For convenience and not limitation, elements of the preceding figures may be used to describe the method. Figure 5 For example, method 500 can be derived from... Figure 3 System 300 Figure 1B Execute on gNB, TRP 140 or TRP 150.

[0039] At 510, system 300 determines whether the Doppler offset measurement is changing rapidly. For example, system 300 may check the uplink probe reference signal (SRS) or uplink demodulation reference signal (DMRS) to make this determination. When it is determined that the Doppler offset measurement is changing rapidly (e.g., one or more thresholds are met), method 500 proceeds to 520. Otherwise, method 500 proceeds to 550.

[0040] At 520, system 300 determines whether an aperiodic TRS is triggered based on a downlink allocation (e.g., PDCCH), wherein the aperiodic TRS is located in the same beam (e.g., the same quasi-co-located (QCLed)) as the Physical Downlink Shared Channel (PDSCH) triggered by the same downlink allocation. When an aperiodic TRS is triggered based on a downlink allocation, (see...) Figure 4 Method 500 proceeds accordingly to generate, as shown in the diagram. Figure 4 The aperiodic TRS shown in the diagram, after which method 500 returns to 510. Otherwise, method 500 proceeds to 530.

[0041] At 530, system 300 determines whether to use information from the Media Access Control (MAC) control element (CE) to activate the semi-permanent (SP)-TRS. If the SP-TRS is to be activated, system 300 uses the MAC CE at layer 2 to activate and deactivate the SP-TRS as needed in a 1-slot format, a 2-slot format, or both. The minimum periodicity of the SP-TRS is less than or equal to the periodicity of the periodic TRS. By using the MAC CE at layer 2 to activate (and subsequently deactivate) the SP-TRS, system 300 is able to provide a higher Doppler measurement density (e.g., allowing the UE to perform more frequent Doppler offset measurements and thus determine more accurate Doppler offset measurements for decoding PDSCH data, which includes combined signals). If the SP-TRS is activated, method 500 returns to 510 after generating the SP-TRS. If the SP-TRS is not activated, method 500 proceeds to 540.

[0042] At 540, system 300 uses information from the MAC CE or downlink control information (DCI) to configure a periodic TRS with a smaller periodicity. Using MAC CE or DCI avoids the need for Radio Resource Control (RRC) reconfiguration, which requires a longer time frame. In some implementations, system 300 configures a periodic TRS with a larger periodicity when the UE is not moving rapidly (see 560 below), and a periodic TRS with a smaller periodicity when the UE is moving rapidly (e.g., when the Doppler offset of the combined signal changes rapidly). By adjusting the periodicity of the periodic TRS via MAC CE or DCI compared to reconfiguring using RRC, system 300 achieves network and UE power savings. System 300 uses MAC CE or DCI to configure a periodic TRS with a smaller periodicity, and method 500 returns to 510 after generating the periodic TRS.

[0043] Returning to 510, when system 300 determines that the Doppler offset is not changing rapidly, method 500 proceeds to 550.

[0044] At 550, if SP-TRS is activated at 530, then system 300 uses MAC CE to disable SP-TRS, and method 500 returns to 510. Otherwise, method 500 proceeds to 560.

[0045] At 560, system 300 uses MAC CE or DCI to configure a periodic TRS with a large periodicity, and method 500 returns to 510.

[0046] Figure 6A method 600 for receiving an enhanced TRS in an SFN having combined signals, according to some embodiments of the present disclosure, is illustrated. For convenience and not limitation, elements of the preceding figures may be used to describe the method. Figure 6 For example, method 600 can be derived from... Figure 3 System 300 or Figure 1B UE 135 execution.

[0047] At 605, system 300 transmits an indication of whether the UE (e.g., UE 135) can support aperiodic TRS based on downlink allocation. Accordingly, the gNB receiving this indication can continue to use downlink allocation (e.g., PDCCH) to transmit aperiodic TRS to help UE 135 determine a more accurate Doppler offset of the combined signal in the SFN.

[0048] At 610, system 300 determines from the physical downlink control channel (PDCCH) that one or more aperiodic TRSs exist in the same beam as the physical downlink shared channel (PDSCH) (e.g., based on downlink allocation).

[0049] At 615, system 300 detects whether the time slot offset configured by gNB for the time slot including the first aperiodic TRS (e.g., 445a) is the same as the time slot offset of PDSCH. If these time slot offsets are the same (e.g., Figure 4 If the schematic diagram 400 and trigger scheme 1 are met, then method 600 proceeds to 620. Otherwise, method 600 proceeds to 645.

[0050] At position 620, system 300 accesses PDSCH and buffers PDSCH data.

[0051] At 625, system 300 is based on one or more of the aperiodic TRS (e.g., Figure 4 The non-periodic TRS445a to 445f measures the Doppler shift; in some examples, the UE determines... Figure 4 The average of the measured Doppler shifts of one or more of the non-periodic TRS 445a to 445f.

[0052] At 630, system 300 uses the measured Doppler offset (or the average of the measured Doppler offsets) determined at 625 to decode the buffered PDSCH data, wherein the PDSCH data is a combined signal (e.g., a combined signal of at least TRP 140 and TRP 150).

[0053] At 635, system 300 determines that the second consecutive time slot includes an aperiodic TRS. In some embodiments, system 300 uses aperiodic TRS 445g to 445l to determine the measured Doppler offset, such as averaging the measured Doppler offset based on one or more aperiodic TRS 445g to 445l, wherein the measured Doppler offset is located at 625.

[0054] At 640, system 300 reports an acknowledgment (e.g., HARQ-ACK) based on the last symbol of the last aperiodic TRS (e.g., aperiodic TRS445l) of the second consecutive time slot.

[0055] Returning to 645, system 300 has determined the time slot offset configured by gNB for the time slot including the first aperiodic TRS (e.g., 495a) and the time slot offset of PDSCH (e.g., Figure 4 The diagram 450 and trigger scheme 2 are different.

[0056] At 650, system 300 is based on aperiodic TRS (e.g., Figure 4 One or more of the non-periodic TRS (495a to 495f) measure the Doppler offset; in some instances, system 300 (e.g., UE 135) determines the average value of the measured Doppler offset.

[0057] At 655, system 300 uses the measured Doppler offset (or the average of the measured Doppler offsets) at 650 to decode data in a second consecutive time slot of PDSCH (e.g., PDSCH 475), where the PDSCH data includes signals from two or more TRPs (e.g., gNB, TRP 140, TRP 150). In some embodiments, system 300 is based on an aperiodic TRS (e.g., Figure 4 One or more of the non-periodic TRS (495g to 495l) measures the second Doppler shift; in some examples, system 300 (e.g., UE 135) buffers PDSCH data to determine Figure 4 The average of one or more of the non-periodic TRS 495g to 495l measured Doppler offsets. System 300 may use a second Doppler offset (or a second averaged Doppler offset) to decode data in PDSCH 475. In some embodiments, system 300 uses a combination of the measured Doppler offset (e.g., at 650) and the second Doppler offset to decode buffered PDSCH data including a combined signal.

[0058] At 660, system 300 reports an acknowledgment (e.g., HARQ-ACK) based on the last symbol of the PDSCH data (e.g., the last symbol of PDSCH 475).

[0059] Figure 7 Example 700 of an electronic device for implementing periodic TRS based on pre-compensated Doppler shift according to some embodiments of the present disclosure is shown. For convenience, and not limitation, elements of the preceding figures can be used to describe the device. Figure 7 Example 700 includes UE 705, gNB1 710, and gNB2 715. Each of these electronic devices can be Figure 3 System 300. UE 705 can be Figure 1B UE 135, while each of gNB1 710 and gNB2 715 can be Figure 1B TRP 140 or TRP 150.

[0060] At 720, the periodicity of periodic TRS, slot offset, and other parameters can be configured.

[0061] At 725, UE 705 transmits the first UL signal; gNB1 710 and gNB2 715 receive the first uplink signal (e.g., SRS or uplink DMRS) associated with UE 705.

[0062] At 730 and 735, gNB1 710 and gNB2 715 measure Doppler offset based on a first uplink signal received from 725 (e.g., a first received SRS or uplink DMRS).

[0063] At 740, gNB1 710 and gNB2 715 use the corresponding Doppler offsets determined at 730 and 735 to adjust the periodic TRS and accordingly transmit a periodic TRS instance #1 with a first indication. For example, this adjustment may include applying a phase shift using the determined Doppler offsets from 730 and 735 to create and transmit the periodic TRS instance #1. Therefore, the periodic TRS instance #1 can be a periodic TRS based on pre-compensated Doppler in the SFN. In some embodiments, the first indication enables the gNB and UE to maintain the same understanding as to whether the periodic TRS is based on a given uplink signal (e.g., the first UL signal at 725) or on a different uplink signal (e.g., a subsequent uplink signal 760 subsequently received by gNB1 710 and / or gNB2 715).

[0064] At 745, UE 705 uses periodic TRS instance #1 to determine the Doppler offset measurement. Furthermore, UE 705 uses a first indication to determine whether the Doppler offset measurement can be combined with a previous Doppler offset measurement (e.g., averaged with the previous Doppler offset measurement).

[0065] At 750, gNB1 710 and gNB2 715 transmit periodic TRS instance #2 based on the same pre-compensated Doppler (e.g., based on the same Doppler offset determined at 730 and 735, respectively) and a second indication.

[0066] At 755, UE 705 uses periodic TRS instance #2 based on the same pre-compensated Doppler in the SFN mode to determine the Doppler offset measurement for periodic TRS instance #2. UE 705 uses a second indication to determine that periodic TRS instance #2 is based on pre-compensated Doppler in the same SFN mode as at 740, and when the data is based on a combined signal, UE 705 may include the Doppler offset measurement of periodic instance #2 in the averaging calculation to determine a more accurate Doppler offset in the SFN. Otherwise, as further discussed below, UE 705 will not include periodic TRS instance #2 in the averaging calculation.

[0067] At 760, UE 705 transmits a second UL signal; gNB1 710 and gNB2 715 receive a second uplink signal (e.g., SRS or uplink DMRS) associated with UE 705.

[0068] At 765 and 770, gNB1 710 and / or gNB2 715 measure Doppler offset based on the received second uplink signal (e.g., second received SRS or uplink DMRS), respectively.

[0069] At 775, gNB1 710 and gNB2 715 use the corresponding Doppler offsets determined at 765 and 770 to adjust the periodic TRS and accordingly transmit periodic TRS instance #3. For example, this adjustment may include applying different phase shifts using the determined Doppler offsets from 765 and 770 to create and transmit periodic TRS instance #3. Therefore, this periodic TRS instance #3 can be a periodic TRS based on different pre-compensated Dopplers in the SFN. In some implementations, gNB1 710 and gNB2 715 also transmit a third indication to maintain the same understanding with UE 705 regarding whether the periodic TRS is based on a given uplink signal or on a different uplink signal (e.g., a subsequent uplink signal subsequently received by gNB1 710 and / or gNB2 715).

[0070] At 780, UE 705 uses periodic TRS instance #3 based on different pre-compensated Dopplers in the SFN mode to determine a third Doppler offset measurement for periodic TRS instance #2. UE 705 uses a third indicator to determine that periodic TRS instance #3 is based on different pre-compensated Dopplers in the same SFN mode as at 775, and when the data is based on a combined signal, UE 705 may omit the Doppler offset measurement of periodic instance #3 from the averaging calculation to determine a more accurate Doppler offset in the SFN.

[0071] Figure 8 A method 800 for transmitting periodic TRS based on pre-compensated Doppler offset in an exemplary wireless system according to some embodiments of the present disclosure is shown. For convenience, and not limitation, elements of the preceding figures may be used to describe the system. Figure 8 Method 800 can be derived from... Figure 3 System 300 Figure 1B This is performed by the gNB, TRP 140, and / or TRP 150. For example, the gNB may employ a Doppler Measurement Limit (DMR) as an indicator transmitted with each periodic TRS, where the DMR indicates whether the periodic TRS is based on the same UL signal or a different UL signal for offset measurement. The value of the DMR allows the UE to determine whether the Doppler offset measurement based on the periodic TRS can be averaged (or not averaged) with previous Doppler offset measurements. The DMR can be configured by RRC layer signaling for each periodic TRS or periodic TRS resource set.

[0072] At 810, system 300 estimates the first Doppler offset based on the first uplink signal (e.g., Figure 7 (725, 730 and 735).

[0073] At 820, system 300 determines a first instance of periodic TRS based on a first pre-compensated Doppler in a single-frequency network (SFN), wherein the first instance of the first periodic TRS is based at least on a first Doppler offset.

[0074] At 830, system 300 enables DMR for each periodic TRS.

[0075] At 840, system 300 transmits periodic TRS instance #1 (e.g., based on the first pre-compensated Doppler and the first DMR value) Figure 7 (740), and the first DMR value indicates that the received user equipment (UE) should not include: a first instance of periodic TRS based on the first pre-compensated Doppler and a calculation including previous periodic TRS. For example, the first DMR value can be enabled. This directs to Figure 7UE 705 indicates that UE 705 should not include previous Doppler offset measurements with the Doppler offset measurements of periodic TRS instance #1. Figure 7 (at position 745), because TRS instance #1 based on pre-compensated Doppler in SFN mode is based on Figure 7 The new UL signal at position 725.

[0076] At 850, system 300 transmits periodic TRS instance #2 based on the first pre-compensated Doppler and second DMR values ​​(e.g., Figure 7 750), where the second DMR value (e.g., not enabled) indicates that the received UE may include (e.g., in Figure 7 (at position 755): Doppler shift measurement of periodic TRS instance #2 based on first pre-compensated Doppler and calculation of periodic TRS instance #1 based on first pre-compensated Doppler. This is because both periodic TRS instances #1 and #2 are based on... Figure 7 The same UL signal at 725.

[0077] At 860, system 300 estimates the second Doppler offset based on the second uplink signal (e.g., Figure 7 (760, 765, 770).

[0078] At 870, system 300 determines periodic TRS instance #3 based on the second pre-compensated Doppler in the SFN, at least based on the second Doppler offset.

[0079] At 880, system 300 transmits periodic TRS instance #3 based on the second pre-compensated Doppler and the third DMR value (e.g., Figure 7 775), where the third DMR value indicates that the received UE should not include: periodic TRS instance #3 based on the second pre-compensated Doppler and calculations including previous periodic TRS. For example, the third DMR value can be enabled. This directs... Figure 7 UE 705 indicates that UE 705 should not include previous Doppler offset measurements with the Doppler offset measurements of periodic TRS instance #3. Figure 7 (at position 780), because TRS instance #3 based on the second pre-compensated Doppler in SFN mode is based on Figure 7 The second UL signal at 760 is different from the first UL signal at 725.

[0080] Figure 9 A method 900 for receiving periodic TRS based on pre-compensated Doppler is illustrated according to some embodiments of the present disclosure. For convenience, and not limitation, elements of the preceding figures may be used to describe the method. Figure 9 Method 900 can be performed by the UE (such as...) Figure 1B UE 135 or Figure 7 UE 705) Figure 3 The system executed a 300 error.

[0081] At 910, system 300 receives periodic TRS and Doppler measurement limitation (DMR) (e.g., Figure 7 (e.g., 740, 750, or 775). This DMR can be configured by higher-level signaling (e.g., RRC signaling).

[0082] At 920, system 300 determines whether the DMR is enabled. If the DMR is enabled, method 900 proceeds to 930. Otherwise, method 900 proceeds to 940.

[0083] At 930, if system 300 determines that DMR is enabled, then system 300 uses a periodic TRS to measure the Doppler shift without averaging previous Doppler shift measurements with this Doppler shift. For example, the periodic TRS could be... Figure 7 Periodic TRS instances #1 or #3.

[0084] At 940, if system 300 determines that DMR is not enabled, it uses a periodic TRS to measure the Doppler shift; the measured Doppler shift can be averaged with a previous Doppler shift measurement. For example, the periodic TRS could be periodic TRS instance #2.

[0085] In some implementations, the gNB can indicate the use of specific uplink signals (such as specific SRS) and tag these specific uplink signals for Doppler estimation purposes. Tagging for DMR can be accomplished via RRC signaling at Layer 3 or using MAC CE at Layer 2, but to indicate different events. Instead of including DMR with each periodic TRS as previously described, DMR is sent to tag specific uplink signals, such as specific SRS, and these specific uplink signals are tagged for Doppler estimation purposes. Figure 7 As an example, the first uplink signal used for offset measurement at 725 and the second uplink signal used for offset measurement at 760 can each be labeled as a Doppler estimated SRS with an indication (e.g., DMR). For a periodic TRS instance located between the two labeled Doppler estimated SRS instances, the UE (e.g., UE705) can perform averaging to estimate the Doppler offset (e.g., at 755, since both 745 and 755 are located at...). Figure 7The UE 705 cannot perform averaging for periodic TRS instances that cross the two marked Doppler estimated SRS instances 725 and 760. For example, the UE 705 cannot perform Doppler offset measurement averaging using the Doppler offset measurement at 755 and the Doppler offset measurement at 780 because they cross (e.g., cross the boundary) the marked Doppler estimated SRS instance 760. In some embodiments, DMR is included only for specific uplink signals (e.g., SRS and DMRS). In some embodiments, DMR is included for each specific uplink signal, where the value of the DMR indicates whether the uplink signal is specifically marked for Doppler estimation.

[0086] In some implementations, when the periodic TRS is a source association of the marked Doppler estimated SRS, the UE applies the same Doppler offset measurement (e.g., frequency offset), meaning the UE transmits the marked Doppler estimated SRS on the uplink based on the received periodic TRS (e.g., a periodic TRS not based on pre-compensated Doppler in the SFN). In some implementations, when the marked Doppler estimated SRS is a source association of the periodic TRS, the UE interprets the periodic TRS transmission as Doppler offset pre-compensation based on the gNB.

[0087] In some implementations, the gNB can be configured using RRC signaling at Layer 3, with a filter window size used to average Doppler measurements of periodic TRS. In one example, the starting point for this filter window size can be predefined (e.g., the first instance of a periodic TRS, or configured by higher-layer signaling such as RRC signaling). For periodic TRS within these filter windows, the UE measures the Doppler offset based on the averaged instances of periodic TRS. For TRS spanning the filter window, the UE can independently measure the Doppler offset based on each instance of periodic TRS (e.g., without averaging with previous Doppler offset measurements).

[0088] Figure 10 Example 1000 of some embodiments according to this disclosure is shown, wherein electronic equipment implements periodic TRS based on pre-compensated Doppler shift in non-SFN measurements. For convenience and not limitation, elements of the preceding figures can be used to describe the invention. Figure 10 Example 1000 includes UE 1005, gNB1 1010, and gNB2 1015. The UE can be UE 705, and the gNB can be either gNB1 710 or gNB2 715. Each of these electronic devices can be Figure 3 System 300. UE705 can be Figure 1BUE 135, while each of gNB1 710 and gNB2 715 can be Figure 1B The TRP 140 or TRP 150. In one example, the UE can individually measure the Doppler offset from the periodic TRS instance from the gNB (e.g., in a non-SFN manner) and report the Doppler offset back to the respective gNBs. Each of these gNBs can determine the pre-compensated Doppler and transmit downlink signals in an SFN manner.

[0089] At position 1020, the periodicity of periodic TRS, slot offset, and other parameters can be configured. For example, when channel measurement resources are based on periodic TRS, the gNB can configure the reporting amount to be the Doppler offset for each report.

[0090] At position 1025, gNB1 1010 periodically transmits TRS1 to UE 1005.

[0091] At 1030, UE 1005 determines the Doppler offset measurement of periodic TRS1.

[0092] At position 1035, gNB2 1015 periodically transmits TRS2 to UE 1005.

[0093] At 1040, UE 1005 determines the Doppler offset measurement of periodic TRS2.

[0094] At position 1045, UE 1005 transmits a Doppler offset report from periodic TRS1 measurements to gNB1 1010. In some implementations, the report is determined independently for each periodic TRS; in other implementations, the UE may report Doppler offsets measured for multiple periodic TRS resource sets. Furthermore, the UE may report differential Doppler offset measurements between two TRPs. In some implementations, UE 1005 reports the measured Doppler offsets via the Physical Uplink Control Channel (PUCCH), the Physical Uplink Shared Channel (PUSCH), or via MAC CE. The determination of whether UE 1005 reports Doppler offset measurements for each periodic TRS can be configured by higher-layer signaling (e.g., RRC signaling) or via DCI.

[0095] At 1050, UE 1005 transmits a Doppler offset report from TRS2 to gNB2 1015. In some implementations, the report is determined independently for each periodic TRS; in other implementations, the UE may report Doppler offsets measured for multiple periodic TRS resource sets. Furthermore, the UE may report differential Doppler offset measurements between two TRPs. In some implementations, UE 1005 reports the measured Doppler offsets via PUCCH, PUSCH, or via MAC CE. The determination of whether UE 1005 reports Doppler offset measurements for each periodic TRS can be configured by higher-layer signaling (e.g., RRC signaling) or via DCI.

[0096] At 1055, gNB1 1010 determines the pre-compensated Doppler offset based on the report received at 1045 and transmits a DL signal with that pre-compensated Doppler offset (e.g., within the PDSCH). Similarly, gNB2 1015 determines the pre-compensated Doppler offset based on the report received at 1050 and transmits a DL signal with that pre-compensated Doppler offset (e.g., within the PDSCH). Note that the downlink signal at 1055 can be a combined signal in SFN mode.

[0097] At 1060, UE 1005 receives downlink combined signals from gNB1 1010 and gNB2 1015.

[0098] Various implementation schemes may, for example, use one or more computer systems such as Figure 11 The computer system 1100 shown is used for implementation. The computer system 1100 can be any well-known computer capable of performing the functions described herein. For example, but not limited to, as shown in reference... Figure 1B The gNB, TRP, and user equipment mentioned herein include, but are not limited to, electronic devices such as smartphones, personal digital assistants (PDAs), cellular phones, laptops, desktop computers, and / or other devices and / or components. The gNB, TRP, and / or UE may include, for example... Figure 3 The functions and / or shown in system 300 Figure 5 Method 500 Figure 6 Method 600 Figure 7 Methods Figure 8 Method 800 Figure 9 Methods and Figure 10 One or all of the methods. For example, computer system 1100 can be used in wireless devices to support enhanced TRS to support high-speed use cases of 5G wireless communication in SFN.

[0099] Computer system 1100 includes one or more processors (also referred to as central processing units or CPUs), such as processor 1104. Processor 1104 is connected to communication infrastructure or bus 1106. Computer system 1100 also includes user input / output devices 1103, such as monitors, keyboards, pointing devices, etc., that communicate with communication infrastructure 1106 via user input / output interface 1102. Computer system 1100 also includes main memory or primary memory 1108, such as random access memory (RAM). Main memory 1108 may include one or more levels of cache. Main memory 1108 stores control logic components (e.g., computer software) and / or data.

[0100] The computer system 1100 may also include one or more auxiliary storage devices or memories 1110. Auxiliary storage 1110 may include, for example, a hard disk drive 1112 and / or a removable storage device or removable storage drive 1114. The removable storage drive 1114 may be a floppy disk drive, tape drive, optical disk drive, optical storage device, tape backup device, and / or any other storage device / drive.

[0101] Removable storage drive 1114 can interact with removable storage unit 1118. Removable storage unit 1118 includes a computer-usable or readable storage device on which computer software (control logic components) and / or data are stored. Removable storage unit 1118 can be a floppy disk, magnetic tape, optical disc, DVD, optical storage disk, and / or any other computer data storage device. Removable storage drive 1114 reads and / or writes to removable storage unit 1118 in a well-known manner.

[0102] According to some implementations, auxiliary storage 1110 may include other means, methods, or other approaches for allowing computer system 1100 to access computer programs and / or other instructions and / or data. Such means, tools, or other methods may include, for example, removable storage unit 1122 and interface 1120. Examples of removable storage unit 1122 and interface 1120 may include program boxes and box interfaces (such as those found in video game devices), removable memory chips (such as EPROM or PROM) and associated sockets, memory sticks and USB ports, memory cards and associated memory card slots, and / or any other removable storage unit and associated interface.

[0103] Computer system 1100 may also include a communication or network interface 1124. Communication interface 1124 enables computer system 1100 to communicate and interact with any combination of remote devices, remote networks, remote entities, etc. (individually and collectively referred to by reference numeral 1128). For example, communication interface 1124 may allow computer system 1100 to communicate with remote device 1128 via communication path 1126, which may be wired and / or wireless, and may include any combination of LAN, WAN, Internet, etc. Control logic components and / or data may be transmitted to and from computer system 1100 via communication path 1126.

[0104] The operations described in the foregoing embodiments can be implemented with a wide variety of configurations and architectures. Therefore, some or all of the operations described in the foregoing embodiments can be performed in hardware, software, or both. In some embodiments, tangible, non-transitory means or articles of art include tangible, non-transitory computer-usable or readable media on which control logic components (software) are stored, also referred to herein as computer program products or program storage devices. This includes, but is not limited to, computer system 1100, main memory 1108, secondary memory 1110, and removable storage units 1118 and 1122, and tangible articles of art embodying any combination thereof. When executed by one or more data processing devices (such as computer system 1100), such control logic components cause such data processing devices to operate as described herein.

[0105] Based on the teachings contained in this disclosure, it will be apparent to those skilled in the art how to use [other methods]. Figure 11 The embodiments of this disclosure may be made and used with data processing devices, computer systems, and / or computer architectures other than those shown herein. Specifically, the embodiments may operate with software, hardware, and / or operating system implementations other than those described herein.

[0106] It should be understood that the Detailed Description section, rather than the Summary and Abstract section, is intended to interpret the claims. The Summary and Abstract section may set forth one or more, but not all, exemplary embodiments of this disclosure as contemplated by the inventors, and therefore is not intended to limit this disclosure or the appended claims in any way.

[0107] Although this disclosure has been described herein with reference to exemplary embodiments in exemplary fields and applications, it should be understood that this disclosure is not limited thereto. Other embodiments and modifications are possible and are within the scope and spirit of this disclosure. For example, and without limiting the generality of this paragraph, embodiments are not limited to the software, hardware, firmware, and / or entities shown in the figures and / or described herein. Furthermore, embodiments (whether or not explicitly described herein) have significant utility for fields and applications beyond those described herein.

[0108] The specific implementation has been described here using functional building blocks that illustrate the implementation of specific functions and their relationships. For ease of description, the boundaries of these functional building blocks have been arbitrarily defined herein. Alternative boundaries may be defined as long as the specified functions and relationships (or their equivalents) are performed appropriately. Furthermore, alternative implementations may use sequences of functional blocks, steps, operations, methods, etc., that differ from those described herein.

[0109] References to “an implementation,” “implementation,” “exemplary implementation,” or similar phrases herein indicate that the described implementation may include specific feature structures, structures, or characteristics, but each implementation need not necessarily include such feature structures, structures, or characteristics. Furthermore, such terminology need not refer to the same implementation. Additionally, when a specific feature structure, structure, or characteristic is described in connection with an implementation, whether or not it is explicitly mentioned or described herein, such feature structure, structure, or characteristic must be within the knowledge of a person skilled in the art to incorporate it into other implementations.

[0110] The breadth and scope of this disclosure should not be limited by any of the exemplary embodiments described above, but should be defined solely by the appended claims and their equivalents.

Claims

1. A first electronic device, comprising: A transceiver configured to transmit and receive 5G wireless communications; A processor, coupled to the transceiver and configured to: The transceiver is used to receive uplink reference signals from user equipment (UE); The determination is based at least on the uplink reference signal: the Doppler offset has met the threshold. After the determination, a plurality of aperiodic tracking reference signals (TRS) with high measurement density are triggered, wherein the plurality of aperiodic TRS share the same quasi-co-address (QCL) parameters with the Physical Downlink Shared Channel (PDSCH) signal triggered by downlink allocation; A first time slot offset is determined, the time slot including the first aperiodic TRS among the plurality of aperiodic TRS, wherein the first time slot offset is the same as the second time slot offset of the PDSCH signal; Using the transceiver and the downlink allocation, the plurality of aperiodic TRSs are transmitted to the UE via a single-frequency network (SFN), wherein the plurality of aperiodic TRSs enable the UE to decode the PDSCH signal, the PDSCH signal comprising a combined signal from the first electronic device and the second electronic device in the SFN; and The HARQ-ACK signal is received based on the last symbol of the last aperiodic TRS among the plurality of aperiodic TRS.

2. The electronic device of claim 1, wherein the processor is further configured to: Based on the second uplink reference signal received from the UE, it is determined that the second Doppler offset has met the second threshold. After determining that the second threshold is met, a second plurality of aperiodic TRS are triggered, the second plurality of aperiodic TRS sharing the second QCL parameter with the second PDSCH signal triggered by the second downlink allocation; Determine a third time slot offset for a second time slot, the second time slot comprising a subset of the second plurality of aperiodic TRS, wherein the third time slot offset differs from a fourth time slot offset of the second PDSCH signal; and The transceiver is used to transmit the subset of the second plurality of aperiodic TRS in the second time slot.

3. The electronic device of claim 2, wherein the processor is further configured to: The second HARQ-ACK signal is received based on the last symbol of the second PDSCH signal.

4. The electronic device of claim 1, wherein the processor is further configured to: Based on the second uplink reference signal received from the UE, it is determined that the second Doppler offset has met the second threshold. After determining that the second threshold is met, it is determined that a second plurality of aperiodic TRS will not be triggered. The second plurality of aperiodic TRS shares the second QCL parameter with the second PDSCH signal triggered by the second downlink allocation. After determining that the second plurality of aperiodic TRS will not be triggered, a media access control (MAC) control element (CE) is used to activate a semi-permanent TRS (SP-TRS), wherein the minimum periodicity of the SP-TRS is less than or equal to the minimum periodicity of the periodic TRS.

5. The electronic device of claim 1, wherein, in order to transmit the plurality of aperiodic TRSs, the processor is further configured to: The transceiver is used to transmit a second consecutive time slot, the second consecutive time slot including the last of the plurality of aperiodic TRS.

6. A method for a 5G node B (gNB), comprising: Receive uplink reference signals from user equipment (UE); The determination is based at least on the uplink reference signal: the Doppler offset has met the threshold. After the determination, a plurality of aperiodic tracking reference signals (TRS) with high measurement density are triggered, wherein the plurality of aperiodic TRS share the same quasi-co-address (QCL) parameters with the Physical Downlink Shared Channel (PDSCH) signal triggered by downlink allocation; A first time slot offset is determined, the time slot including the first aperiodic TRS among the plurality of aperiodic TRS, wherein the first time slot offset is the same as the second time slot offset of the PDSCH signal; In a single-frequency network (SFN), the plurality of aperiodic TRS are transmitted to the UE, wherein the plurality of aperiodic TRS enable the UE to decode a combined signal from the gNB and the second gNB in ​​the SFN; as well as The HARQ-ACK signal is received based on the last symbol of the last aperiodic TRS among the plurality of aperiodic TRS.

7. The method according to claim 6, further comprising: Based on the second uplink reference signal received from the UE, it is determined that the second Doppler offset has met the second threshold. After determining that the second threshold is met, a second plurality of aperiodic TRS are triggered, the second plurality of aperiodic TRS sharing the second QCL parameter with the second PDSCH signal triggered by the second downlink allocation; Determine the third time slot offset of the second time slot, the second time slot including a subset of the second plurality of aperiodic TRS, wherein the third time slot offset is different from the fourth time slot offset of the second PDSCH signal; as well as Transmit the subset of the second plurality of aperiodic TRS in the second time slot.

8. The method according to claim 7, further comprising: The second HARQ-ACK signal is received based on the last symbol of the second PDSCH signal.

9. The method according to claim 6, further comprising: Based on the second uplink reference signal received from the UE, it is determined that the second Doppler offset has met the second threshold. After determining that the second threshold is met, it is determined that a second plurality of aperiodic TRS will not be triggered. The second plurality of aperiodic TRS shares the second QCL parameter with the second PDSCH signal triggered by the second downlink allocation. After determining that the second plurality of aperiodic TRS will not be triggered, a media access control (MAC) control element (CE) is used to activate a semi-permanent TRS (SP-TRS), wherein the minimum periodicity of the SP-TRS is less than or equal to the minimum periodicity of the periodic TRS.

10. The method of claim 6, wherein transmitting the plurality of aperiodic TRS comprises: The second consecutive time slot is transmitted, the second consecutive time slot including the last of the plurality of aperiodic TRS.

11. A non-transitory computer-readable medium storing instructions, said instructions, when executed by a processor of a 5G Node B (gNB), causing the processor to perform operations, said operations including: Receive uplink reference signals from user equipment (UE); The determination is based at least on the uplink reference signal: the Doppler offset has met the threshold. Based on the determination, a plurality of aperiodic tracking reference signals (TRS) with high measurement density are triggered, wherein the plurality of aperiodic TRS share the same quasi-co-address (QCL) parameters with the Physical Downlink Shared Channel (PDSCH) signal triggered by downlink allocation; A first time slot offset is determined, the time slot including the first aperiodic TRS among the plurality of aperiodic TRS, wherein the first time slot offset is the same as the second time slot offset of the PDSCH signal; In a single-frequency network (SFN), the plurality of aperiodic TRS are transmitted to the UE, wherein the plurality of aperiodic TRS enable the UE to decode a combined signal from the gNB and the second gNB in ​​the SFN; as well as The HARQ-ACK signal is received based on the last symbol of the last aperiodic TRS among the plurality of aperiodic TRS.

12. The non-transitory computer-readable medium of claim 11, wherein the operation further comprises: Based on the second uplink reference signal received from the UE, it is determined that the second Doppler offset has met the second threshold. After determining that the second threshold is met, it is determined that a second plurality of aperiodic TRS will not be triggered. The second plurality of aperiodic TRS shares the second QCL parameter with the second PDSCH signal triggered by the second downlink allocation. After determining that the second plurality of aperiodic TRS will not be triggered, a media access control (MAC) control element (CE) is used to activate a semi-permanent TRS (SP-TRS), wherein the minimum periodicity of the SP-TRS is less than or equal to the minimum periodicity of the periodic TRS.

13. The non-transitory computer-readable medium of claim 11, wherein the operation further comprises: The second consecutive time slot is transmitted, the second consecutive time slot including the last of the plurality of aperiodic TRS.

14. The non-transitory computer-readable medium of claim 11, wherein the operation further comprises: Based on the second uplink reference signal received from the UE, it is determined that the second Doppler offset has met the second threshold. After determining that the second threshold is met, a second plurality of aperiodic TRS are triggered, the second plurality of aperiodic TRS sharing the second QCL parameter with the second PDSCH signal triggered by the second downlink allocation; Determine the third time slot offset of the second time slot, the second time slot including a subset of the second plurality of aperiodic TRS, wherein the third time slot offset is different from the fourth time slot offset of the second PDSCH signal; as well as Transmit the subset of the second plurality of aperiodic TRS in the second time slot.

15. The non-transitory computer-readable medium of claim 14, wherein the operation further comprises: The second HARQ-ACK signal is transmitted based on the last symbol of the second PDSCH signal.

Images