User equipment, base station and common beam determination method

Abstract

A user equipment (UE), a base station and a common beam determination method are provided. The method of common beam determination by a UE includes the UE determining one or more transmission configuration indication (TCI) states from a base station, wherein the one or more TCI states include one or more reference signals (RSs), the UE determining one or more beams from the base station, wherein the one or more beams are used for a multi-beam operation, the UE identifying one or more common beams from the one or more beams according to the one or more RSs, and the UE using the one or more common beams for downlink (DL) reception and uplink (UL) transmission in the multi-beam operation. This defines a unified common beam indication for DL and UL in a multi-beam operation.

Description

Technical Field

[0001] This invention relates to the field of wireless communication systems operating in multiple-input multiple-output (MIMO) systems, and more specifically, to methods for determining user equipment (UE), base stations, and common beams, which can enhance the design of common beams for data and control transmission / reception in downlink (DL) and uplink (UL) in multi-beam transmission. Background Technology

[0002] Wireless communication systems are widely deployed to provide various types of communication content, such as voice, video, packet data, messaging, and broadcasting. These systems may be able to support communication with multiple users by sharing available system resources (e.g., time, frequency, and power). Examples of such multiple access systems include fourth-generation (4G) systems such as Long Term Evolution (LTE) systems and fifth-generation (5G) systems, which may be called New Radio (NR) systems. These systems may employ technologies such as Code Division Multiple Access (CDMA), Time Division Multiple Access (TDMA), Frequency Division Multiple Access (FDMA), Orthogonal Frequency Division Multiple Access (OFDMA), or Discrete Fourier Transform Extended OFDM (DFT-S-OFDM). A wireless multiple access communication system may include multiple base stations or network access nodes, each supporting communication from multiple communication devices simultaneously, which may also be referred to as User Equipment (UE).

[0003] A wireless communication network may include base stations that can support communication for the UE. The UE can communicate with the base station via downlink (DL) and uplink (UL). DL refers to the communication link from the base station to the UE, and UL refers to the communication link from the UE to the base station.

[0004] Multiple-input multiple-output (MIMO) is an effective method to enhance radio link capacity due to the multiplexing of transmit and receive antennas. MIMO refers to a practical technique that simultaneously transmits and receives multiple data signals on the same radio channel, greatly improving spectral efficiency. However, the DL and UL beam indication mechanisms in multi-beam transmission operating in MIMO systems remain unresolved issues.

[0005] Therefore, there is a need for a user equipment (UE), base station, and common beam determination method that can solve the problems in the prior art, define a unified common beam indication for data and control the transmission / reception of DL and UL in multi-beam operation, enhance the common beam design for data and control transmission / reception of DL and UL in multi-beam operation, provide good communication performance, and / or provide high reliability. Summary of the Invention

[0006] One object of the present invention is to provide a method for determining a user equipment (UE), base station, and common beam, which can solve the problems in the prior art, define a unified common beam indication for data and control the transmission / reception of DL and UL in multi-beam operation, enhance the common beam design for data and control transmission / reception of DL and UL in multi-beam operation, provide good communication performance, and / or provide high reliability.

[0007] In a first aspect of the invention, a method for a user equipment (UE) to determine a common beam is provided, characterized in that it includes: the UE determining one or more Transmission Configuration Indication (TCI) states from a base station, wherein the one or more TCI states include one or more reference signals (RS); the UE determining one or more beams from the base station, wherein the one or more beams are used for multi-beam operation; the UE identifying one or more common beams from the one or more beams based on the one or more RSs; and the UE using the one or more common beams for downlink DL reception and uplink UL transmission in the multi-beam operation.

[0008] In one embodiment of the invention, the one or more common beams are indicated according to the one or more RSs associated with the one or more beams.

[0009] In one embodiment of the present invention, the base station is configured with only one TCI state.

[0010] In one embodiment of the invention, when there is only one RS in a TCI state, the RS is associated with the common beam of both the DL reception and / or the UL transmission in the multi-beam operation.

[0011] In one embodiment of the present invention, the RS includes DL RS and / or UL RS.

[0012] In one embodiment of the present invention, the DL RS includes Channel State Information (CSI RS).

[0013] In one embodiment of the present invention, the UL RS includes a detection reference signal SRS.

[0014] In one embodiment of the invention, the common beam is indicated using Radio Resource Control (RRC) signaling and Media Access Control (MAC) control element (CE) signaling.

[0015] In one embodiment of the present invention, the TCI state is activated by MAC CE signaling, and the downlink control information (DCI) field is used to indicate a beam in a TCL state.

[0016] In one embodiment of the invention, when the indicator beam in the TCI state is not the common beam, and if there are other common beams associated with the RS in the TCI state, the UE uses the common beam with the lowest index in the TCI state to perform the DL reception and UL transmission in the multi-beam operation.

[0017] In one embodiment of the present invention, when the UE is configured with the beam associated with the RS of the TCI state, the method further includes the UE determining the mapping between the beam and the RS.

[0018] In one embodiment of the present invention, the UE identifying the one or more common beams from the one or more beams based on the one or more RSs includes: the UE identifying the one or more common beams from the beams based on the mapping between the beams and the RSs.

[0019] In one embodiment of the present invention, the RS includes parameters, the parameters including at least one of the following: number of bits; or time slot of the UL signal received by the base station.

[0020] In one embodiment of the present invention, the UE determines the mapping between the beam and the RS through system information.

[0021] In one embodiment of the present invention, the UE identifies one or more common beams from the beams according to the mapping between the beam and the RS, comprising: the UE performing beam measurement on the beam according to the mapping between the beam and the RS; the UE reporting the beam measurement to the base station; the UE receiving a first indication of the one or more common beams from the base station, wherein the first indication of the one or more common beams includes a first selection of the one or more common beams by the base station based on the beam measurement.

[0022] In one embodiment of the present invention, the UE identifies one or more common beams from the beams according to the mapping between the beam and the RS, including: the UE performing a UL beam scan; the UE sending the UL RS configured by the TCI state to the base station; and the UE receiving a second indication of the one or more common beams from the base station, wherein the second indication of the one or more common beams includes a second selection of the one or more common beams by the base station according to the UL RS.

[0023] In one embodiment of the invention, the one or more common beams depend on the associated UL RS, wherein the UL RS is the signal most recently received by the base station.

[0024] In one embodiment of the present invention, the TCI state is activated by MAC CE signaling, and the downlink control information (DCI) field is applied to indicate that the one or more beams are in the one or more TCI states during the scheduling time.

[0025] In one embodiment of the present invention, when one or more indicator beams in one or more TCI states during the scheduling time are not the one or more common beams, in the multi-beam operation, the UE uses the most recently indicated common beam for the DL reception and the UL transmission before the scheduling time.

[0026] In one embodiment of the present invention, the method is performed in a joint common beam indication mode, a separate common beam indication mode, a hybrid common beam indication mode, or a default common beam indication mode.

[0027] In one embodiment of the present invention, when the method is performed in the joint common beam indication mode, the UE uses the same common beam for the DL reception and the UL transmission in the multi-beam operation.

[0028] In one embodiment of the present invention, for the joint common beam indication method, both the DL reception and the UL transmission are indicated by only one common beam. When only one RS is in a single TCI state, the RS is associated with the common beam used for the DL reception and the UL transmission.

[0029] In one embodiment of the present invention, the RS is the DL RS or the UL RS.

[0030] In one embodiment of the invention, for the joint common beam indication method, a combination of K beams associated with a flag is used to identify the common beam, where K is greater than 1.

[0031] In one embodiment of the present invention, if several of the K beams are the common beam, the common beam is determined by the flag value corresponding to each beam.

[0032] In one embodiment of the invention, if the DL RS provides the common beam, the base station selects a beam associated with the number of bits in the flag via a reported CSI from the UE; if the UL RS provides the common beam, the base station selects a beam associated with the number of bits in the flag via an SRS from the UE. The selected beam depends on the associated uplink signal received at the base station in the most recently received signal including the reported CSI or the SRS. A combination of K beams and flags is used to identify whether the indicated beam is the common beam.

[0033] In one embodiment of the present invention, for the joint common beam indication method, each beam is used for one time slot unit, and the base station selects the beam by the most recently received signal including CSI or SRS reports. Each signal received by the base station corresponds to a time slot, and the base station identifies whether the selected beam is the common beam by the correspondence between the time slot and the beam.

[0034] In one embodiment of the present invention, when the method is executed in the separated common beam indication mode, in the multi-beam operation, the UE applies independent common beams for the DL reception and the UL transmission, respectively.

[0035] In one embodiment of the invention, one or more RSs in M ​​TCIs provide a quasi-co-located QCL assumption for the DL reception, one or more RSs in N TCIs provide a spatial filter for the UL transmission, and one or more candidate common beams for the DL reception and the UL transmission are respectively included in the M TCIs and the N TCIs, wherein M is greater than or equal to 1 and N is greater than or equal to 1.

[0036] In one embodiment of the invention, for the DL reception or the UL transmission, when there is only one TCI state, the TCL state includes only one RS to provide the QCL assumption for the DL reception or the spatial filter for the UL transmission, and the beam associated with the RS is the common beam of the DL reception or the UL transmission in the multi-beam operation.

[0037] In one embodiment of the invention, when the RS is associated with a plurality of K DL beams and L UL beams contained in the TCI state, the RS is configured to indicate whether the K×L beam pairs include the one or more common beams.

[0038] In one embodiment of the invention, when the method is performed in the separated common beam indication mode and when only one TCI state contains only one RS providing a reference for the QCL or the spatial filter, the beam associated with the RS is the common beam used for the DL reception or the UL transmission.

[0039] In one embodiment of the present invention, when the method is executed in the separated common beam indication mode and when the base station performs beam scanning, the UE performs beam measurement. After measuring the beam, the UE sends the UL RS to the base station at the time slot position associated with the measured beam. The base station measures the UL RS and selects the optimal UL beam to obtain a beam pair.

[0040] In one embodiment of the invention, when the method is executed in the Separated Common Beam Indication mode and there is only one TCI state, the DL beam associated with the DL RS and the UL beam associated with the UL RS are both configured in the TCI state.

[0041] In one embodiment of the invention, when the method is executed in the separated common beam indication mode and there is only one TCI state, and if the indicated DL beam and the indicated UL beam of the indicated beam pair are not the DL common beam and the UL common beam, the UE uses the common beam with the lowest beam pair index for the DL reception and the UL transmission in the multi-beam operation in the TCI state.

[0042] In one embodiment of the invention, when the method is executed in the separated common beam indication mode and there is only one TCI state, if the indicated beam pair is not the common beam, but the indicated DL beam or indicated UL beam in the indicated beam pair is a DL common beam or a UL common beam, the UE uses the common beam with the lowest beam pair index for DL ​​and UL indication in the TCI state, wherein the lowest beam pair includes the DL or UL common beam associated with the indicated common beam pair.

[0043] In one embodiment of the present invention, when the method is executed in the separated common beam indication mode, when the UE is configured with multiple TCI states, when the common beam does not exist in the indicated TCI state, and if the indicated DL beam and the indicated UL beam of the indicated beam pair are not the DL common beam and the UL common beam, the UE performs the DL reception and the UL transmission using the latest indicated common beam before the scheduling time.

[0044] In one embodiment of the present invention, when the method is executed in the separated common beam indication mode, when the UE is configured with multiple TCI states, when the common beam does not exist in the indicated TCI state, and if the DL beam or UL beam of the indicated common beam pair is the common beam, the UE performs the DL reception and the UL transmission using the latest indicated common beam before the scheduling time, wherein the indicated common beam includes the DL or UL common beam associated with the indicated common beam pair during the scheduling time.

[0045] In one embodiment of the present invention, when the method is executed in the hybrid common beam indication mode, the UE uses a first type of common beam and a second type of common beam, wherein the first type of common beam is configured for the DL reception and the UL transmission in the multi-beam operation, and the second type of common beam is configured only for the DL reception or the UL transmission in the multi-beam operation.

[0046] In one embodiment of the invention, one or more RSs configured in one or more TCLs provide the first type of common beam and the second type of common beam.

[0047] In one embodiment of the invention, when the RS is associated with a plurality of K DL beams and L UL beams, the S beam is applied to the DL reception and the UL transmission included in the TCI state, and the RS is configured to indicate whether the K multiplied by L plus S beam pairs include one or more common beams.

[0048] In one embodiment of the present invention, the first type of common beam and the second type of common beam have different priorities.

[0049] In one embodiment of the present invention, the first type of common beam has a higher priority than the second type of common beam.

[0050] In one embodiment of the present invention, when the common beam in the TCI state does not exist, the first type of common beam and the second type of common beam with higher priority configuration included in the TCI state indicated by the most recent scheduling time are regarded as the common beam.

[0051] In one embodiment of the present invention, the base station configures a time window for the UE to distinguish whether the common beam or the common beam pair is valid.

[0052] In one embodiment of the present invention, if the first type of common beam is present not only during the window period, the UE uses the common beam with the lowest index in the TCI state for the DL reception and UL transmission in the multi-beam operation; and / or if the window period contains only the second type of common beam, the UE uses the common beam with the lowest beam pair index in the TCI state for the DL reception and UL transmission in the multi-beam operation.

[0053] In one embodiment of the invention, when the method is executed in the hybrid common beam indication mode, K multiplied by L beam pairs are obtained by combining K DL beams associated with multiple DL RSs and L UL beams associated with multiple UL RSs, and a total of K multiplied by L plus S beams / pairs are available for the DL reception and the UL transmission.

[0054] In one embodiment of the invention, when the method is executed in the hybrid common beam indication mode, if there is a selected beam with an index from the first beam to the s-th beam, the UE uses the RS to measure the beam and provides the common beam only for the DL reception or the UL transmission; and / or if there is a selected beam with an index from the first beam pair to K times the L-th beam pair, the UE uses the RS to measure the beam and provides the common beam for the DL reception and the UL transmission.

[0055] In one embodiment of the present invention, when the method is executed in the default common beam indication mode, when the DL and UL default beams are aligned, the UE uses one or more default common beams as the one or more common beams.

[0056] In one embodiment of the invention, the one or more default common beams include the latest common beam with the lowest index included in one of the scheduling times.

[0057] In a second aspect of the invention, a method for a base station to determine a common beam includes: the base station configuring one or more Transmission Configuration Indication (TCI) states to a user equipment (UE), wherein the one or more TCI states include one or more reference signals (RS); the base station configuring one or more beams to the UE, wherein the one or more beams are used for multi-beam operation; the base station identifying one or more common beams from the one or more beams based on the one or more RSs; and the base station using the one or more common beams for downlink DL reception and uplink UL transmission in the multi-beam operation.

[0058] In one embodiment of the invention, the one or more common beams are indicated according to the one or more RSs associated with the one or more beams.

[0059] In one embodiment of the present invention, the base station is configured with only one TCI state.

[0060] In one embodiment of the invention, when there is only one RS in a TCI state, the RS is associated with the common beam of both the DL reception and / or the UL transmission in the multi-beam operation.

[0061] In one embodiment of the present invention, the RS includes DL RS and / or UL RS.

[0062] In one embodiment of the present invention, the DL RS includes Channel State Information (CSI RS).

[0063] In one embodiment of the present invention, the UL RS includes a detection reference signal SRS.

[0064] In one embodiment of the invention, Radio Resource Control (RRC) signaling and Media Access Control (MAC) control element (CE) signaling are used to indicate the common beam.

[0065] In one embodiment of the present invention, the TCI state is activated by MAC CE signaling, and the downlink control information (DCI) field is used to indicate a beam in a TCL state.

[0066] In one embodiment of the invention, when the indicator beam in the TCI state is not the common beam, and if there are other common beams associated with the RS in the TCI state, the UE uses the common beam with the lowest index in the TCI state to perform the DL reception and UL transmission in the multi-beam operation.

[0067] In one embodiment of the present invention, when the method is performed in a joint common beam indication mode, the UE uses the same common beam for both DL reception and UL transmission in the multi-beam operation.

[0068] In one embodiment of the present invention, the base station identifying the one or more common beams from the one or more beams based on the one or more RSs includes: the base station identifying the one or more common beams from the beams based on the mapping between the beams and the RSs.

[0069] In one embodiment of the present invention, the RS includes parameters, the parameters including at least one of the following: number of bits; or time slot of the UL signal received by the base station.

[0070] In one embodiment of the present invention, the base station determines the mapping between the beam and the RS through system information.

[0071] In one embodiment of the present invention, the base station identifies one or more common beams from the beams according to the mapping between the beam and the RS, including: the base station receiving beam measurement of the beam according to the mapping between the beam and the RS transmitted by the UE; and the base station sending a first indication of the one or more common beams to the UE, wherein the first indication of the one or more common beams includes a first selection of the one or more common beams by the base station according to the beam measurement.

[0072] In one embodiment of the present invention, the base station identifies one or more common beams from the beams according to the mapping between the beam and the RS, including: the base station receiving a UL RS configured in the TCI state from the UE; the base station measuring the UL RS from the UE; and the base station sending a second indication of the one or more common beams to the UE, wherein the second indication of the one or more common beams includes a second selection of the one or more common beams by the base station based on the UL RS.

[0073] In one embodiment of the invention, the one or more common beams depend on the associated UL RS, wherein the UL RS is the signal most recently received by the base station.

[0074] In one embodiment of the present invention, the TCI state is activated by MAC CE signaling, and the downlink control information (DCI) field is applied to indicate that the one or more beams are in the one or more TCI states during the scheduling time.

[0075] In one embodiment of the present invention, when one or more indicator beams in one or more TCI states during the scheduling time are not the one or more common beams, in the multi-beam operation, the UE uses the most recently indicated common beam for the DL reception and the UL transmission before the scheduling time.

[0076] In one embodiment of the present invention, the method is performed in a joint common beam indication mode, a separate common beam indication mode, a hybrid common beam indication mode, or a default common beam indication mode.

[0077] In one embodiment of the present invention, when the method is performed in the joint common beam indication mode, the UE uses the same common beam for the DL reception and the UL transmission in the multi-beam operation.

[0078] In one embodiment of the present invention, for the joint common beam indication method, both the DL reception and the UL transmission are indicated by only one common beam. When only one RS is in a single TCI state, the RS is associated with the common beam used for the DL reception and the UL transmission.

[0079] In one embodiment of the present invention, the RS is the DL RS or the UL RS.

[0080] In one embodiment of the invention, for the joint common beam indication method, a combination of K beams associated with a flag is used to identify the common beam, where K is greater than 1.

[0081] In one embodiment of the present invention, if several of the K beams are the common beam, the common beam is determined by the flag value corresponding to each beam.

[0082] In one embodiment of the invention, if the DL RS provides the common beam, the base station selects a beam associated with the number of bits in the flag via a reported CSI from the UE; if the UL RS provides the common beam, the base station selects a beam associated with the number of bits in the flag via an SRS from the UE. The selected beam depends on the associated uplink signal received at the base station in the most recently received signal including the reported CSI or the SRS. A combination of K beams and flags is used to identify whether the indicated beam is the common beam.

[0083] In one embodiment of the present invention, for the joint common beam indication method, each beam is used for one time slot unit, and the base station selects the beam by the most recently received signal including CSI or SRS reports. Each signal received by the base station corresponds to a time slot, and the base station identifies whether the selected beam is the common beam by the correspondence between the time slot and the beam.

[0084] In one embodiment of the present invention, when the method is executed in the separated common beam indication mode, in the multi-beam operation, the UE applies independent common beams for the DL reception and the UL transmission, respectively.

[0085] In one embodiment of the invention, one or more RSs in M ​​TCIs provide a quasi-co-located QCL assumption for the DL reception, one or more RSs in N TCIs provide a spatial filter for the UL transmission, and one or more candidate common beams for the DL reception and the UL transmission are respectively included in the M TCIs and the N TCIs, wherein M is greater than or equal to 1 and N is greater than or equal to 1.

[0086] In one embodiment of the invention, for the DL reception or the UL transmission, when there is only one TCI state, the TCL state includes only one RS to provide the QCL assumption for the DL reception or the spatial filter for the UL transmission, and the beam associated with the RS is the common beam of the DL reception or the UL transmission in the multi-beam operation.

[0087] In one embodiment of the invention, when the RS is associated with a plurality of K DL beams and L UL beams contained in the TCI state, the RS is configured to indicate whether the K×L beam pairs include the one or more common beams.

[0088] In one embodiment of the invention, when the method is performed in the separated common beam indication mode and when only one TCI state contains only one RS providing a reference for the QCL or the spatial filter, the beam associated with the RS is the common beam used for the DL reception or the UL transmission.

[0089] In one embodiment of the present invention, when the method is executed in the separated common beam indication mode and when the base station performs beam scanning, the UE performs beam measurement. After measuring the beam, the UE sends the UL RS to the base station at the time slot position associated with the measured beam. The base station measures the UL RS and selects the optimal UL beam to obtain a beam pair.

[0090] In one embodiment of the invention, when the method is executed in the Separated Common Beam Indication mode and there is only one TCI state, the DL beam associated with the DL RS and the UL beam associated with the UL RS are both configured in the TCI state.

[0091] In one embodiment of the invention, when the method is executed in the separated common beam indication mode and there is only one TCI state, and if the indicated DL beam and the indicated UL beam of the indicated beam pair are not the DL common beam and the UL common beam, the UE uses the common beam with the lowest beam pair index for the DL reception and the UL transmission in the multi-beam operation in the TCI state.

[0092] In one embodiment of the invention, when the method is executed in the separated common beam indication mode and there is only one TCI state, if the indicated beam pair is not the common beam, but the indicated DL beam or indicated UL beam in the indicated beam pair is a DL common beam or a UL common beam, the UE uses the common beam with the lowest beam pair index for DL ​​and UL indication in the TCI state, wherein the lowest beam pair includes the DL or UL common beam associated with the indicated common beam pair.

[0093] In one embodiment of the present invention, when the method is executed in the separated common beam indication mode, when the UE is configured with multiple TCI states, when the common beam does not exist in the indicated TCI state, and if the indicated DL beam and the indicated UL beam of the indicated beam pair are not the DL common beam and the UL common beam, the UE performs the DL reception and the UL transmission using the latest indicated common beam before the scheduling time.

[0094] In one embodiment of the present invention, when the method is executed in the separated common beam indication mode, when the UE is configured with multiple TCI states, when the common beam does not exist in the indicated TCI state, and if the DL beam or UL beam of the indicated common beam pair is the common beam, the UE performs the DL reception and the UL transmission using the latest indicated common beam before the scheduling time, wherein the indicated common beam includes the DL or UL common beam associated with the indicated common beam pair during the scheduling time.

[0095] In one embodiment of the present invention, when the method is executed in the hybrid common beam indication mode, the UE uses a first type of common beam and a second type of common beam, wherein the first type of common beam is configured for the DL reception and the UL transmission in the multi-beam operation, and the second type of common beam is configured only for the DL reception or the UL transmission in the multi-beam operation.

[0096] In one embodiment of the invention, one or more RSs configured in one or more TCLs provide the first type of common beam and the second type of common beam.

[0097] In one embodiment of the invention, when the RS is associated with a plurality of K DL beams and L UL beams, the S beam is applied to the DL reception and the UL transmission included in the TCI state, and the RS is configured to indicate whether the K multiplied by L plus S beam pairs include one or more common beams.

[0098] In one embodiment of the present invention, the first type of common beam and the second type of common beam have different priorities.

[0099] In one embodiment of the present invention, the first type of common beam has a higher priority than the second type of common beam.

[0100] In one embodiment of the present invention, when the common beam in the TCI state does not exist, the first type of common beam and the second type of common beam with higher priority configuration included in the TCI state indicated by the most recent scheduling time are regarded as the common beam.

[0101] In one embodiment of the present invention, the base station configures a time window for the UE to distinguish whether the common beam or the common beam pair is valid.

[0102] In one embodiment of the present invention, if the first type of common beam is present not only during the window period, the UE uses the common beam with the lowest index in the TCI state for the DL reception and UL transmission in the multi-beam operation; and / or if the window period contains only the second type of common beam, the UE uses the common beam with the lowest beam pair index in the TCI state for the DL reception and UL transmission in the multi-beam operation.

[0103] In one embodiment of the invention, when the method is executed in the hybrid common beam indication mode, K multiplied by L beam pairs are obtained by combining K DL beams associated with multiple DL RSs and L UL beams associated with multiple UL RSs, and a total of K multiplied by L plus S beams / pairs are available for the DL reception and the UL transmission.

[0104] In one embodiment of the invention, when the method is executed in the hybrid common beam indication mode, if there is a selected beam with an index from the first beam to the s-th beam, the UE uses the RS to measure the beam and provides the common beam only for the DL reception or the UL transmission; and / or if there is a selected beam with an index from the first beam pair to K times the L-th beam pair, the UE uses the RS to measure the beam and provides the common beam for the DL reception and the UL transmission.

[0105] In one embodiment of the present invention, when the method is executed in the default common beam indication mode, when the DL and UL default beams are aligned, the UE uses one or more default common beams as the one or more common beams.

[0106] In one embodiment of the invention, the one or more default common beams include the latest common beam with the lowest index included in one of the scheduling times.

[0107] In a third aspect of the invention, a user equipment (UE) for common beam determination includes a memory, a transceiver, and a processor coupled to the memory and the transceiver. The processor is configured to determine one or more Transmission Configuration Indication (TCI) states from a base station, wherein the one or more TCI states include one or more reference signals (RS); determine one or more beams from the base station, wherein the one or more beams are used for multi-beam operation; identify one or more common beams from the one or more beams based on the one or more RSs; and use the one or more common beams for downlink DL reception and uplink UL transmission in the multi-beam operation.

[0108] In one embodiment of the present invention, the processor is configured to perform the above-described method.

[0109] In a fourth aspect of the invention, a base station for common beam determination includes a memory, a transceiver, and a processor coupled to the memory and the transceiver. The processor is configured to configure one or more Transmission Configuration Indicator (TCI) states to a User Equipment (UE), wherein the one or more TCI states include one or more Reference Signals (RS); configure one or more beams to the UE, wherein the one or more beams are used for multi-beam operation; identify one or more common beams from the one or more beams based on the one or more RSs; and use the one or more common beams for downlink (DL) reception and uplink (UL) transmission in the multi-beam operation.

[0110] In one embodiment of the present invention, the processor is configured to perform the above-described method.

[0111] In a fifth aspect of the invention, thereon a non-transitory machine-readable storage medium having instructions stored thereon, characterized in that, when the instructions are executed by a computer, the computer performs the above-described method.

[0112] In a sixth aspect of the invention, a chip includes a processor configured to invoke and run a computer program stored in a memory to cause a device on which the chip is mounted to perform the methods described above.

[0113] In a seventh aspect of the invention, a computer-readable storage medium stores a computer program, wherein the computer program causes a computer to perform the above-described method.

[0114] In an eighth aspect of the invention, a computer program product includes a computer program, wherein the computer program causes a computer to perform the methods described above.

[0115] In a ninth aspect of the invention, there is a computer program that causes a computer to perform the above-described method. Attached Figure Description

[0116] To further illustrate the technical solutions of the embodiments of the present invention, the accompanying drawings required for describing the embodiments will be briefly introduced below. Obviously, the following drawings are only some embodiments of the present invention. For any person skilled in the art, other drawings can be obtained based on the following drawings without creative effort.

[0117] Figure 1 This is a schematic diagram of beam indication in multiple-input multiple-output (MIMO) multi-beam transmission.

[0118] Figure 2 This is a block diagram of one or more user equipment (UE) and base station (e.g., gNB) communicating in a communication network system according to an embodiment of the present invention.

[0119] Figure 3 This is a flowchart of a common beam determination method performed by a user equipment (UE) according to an embodiment of the present invention.

[0120] Figure 4 This is a flowchart of a common beam determination method performed by a base station according to an embodiment of the present invention.

[0121] Figure 5 This is a schematic diagram illustrating an example of common beam determination when a common beam is not present in the Transmission Configuration Indication (TCI) state, according to an embodiment of the present invention.

[0122] Figure 6 This is a schematic diagram illustrating an example of common beam determination when there is no common beam in the TCI state, as per an embodiment of the present invention.

[0123] Figure 7 This is a schematic diagram illustrating an example of common beam determination when a common beam does not exist in the TCI state, according to an embodiment of the present invention.

[0124] Figure 8 This is a block diagram of a system for wireless communication according to an embodiment of the present invention. Detailed Implementation

[0125] The technical aspects, structural features, achieved objectives, and effects of the embodiments of the present invention will be described in detail below with reference to the accompanying drawings. Specifically, the terminology used in the embodiments of the present invention is only for illustrating the purpose of the embodiments and is not intended to limit the present invention.

[0126] Multi-beam operation in Multiple-Input Multiple-Output (MIMO):

[0127] One primary goal of beam management enhancement is to reduce latency and overhead. Beam management can include three outputs: beam measurement, beam reporting, and beam indication. First, base stations such as the gNB are expected to scan multiple candidate beams for further management and send these candidate beams to the User Equipment (UE). The UE measures the candidate beams according to certain performance criteria. Then, after performing beam measurement, the UE reports the beam measurements that meet the performance criteria to the gNB for further implementation. Finally, the gNB selects the optimal beam to indicate the transmission of the Physical Downlink Shared Channel (PDSCH).

[0128] Figure 1 The diagram illustrates beam indication in multi-beam transmission in Multiple-Input Multiple-Output (MIMO). Figure 1 The illustration shows the establishment of a beam link between a base station, such as a gNB, and a UE to enhance beam indication. In current technologies such as Relase-15 New Radio (NR), dynamic beam indication for the PDSCH aims to reduce latency and overhead. Dynamic beam indication is based on the Transmission Configuration Indication (TCI) state associated with the Downlink Reference Signal (DL-RS), namely the Synchronization Signal Block (SSB) and Channel State Information-RS (CSI-RS). PDSCH beam indication is dynamically triggered by Downlink Control Information (DCI) carried on the Physical Downlink Control Channel (PDCCH). The UE applies the indication beam and switches the receive (RX) beam after successfully decoding the DCI format. Furthermore, in Relase-15, NR supports beam indication for PDSCH transmission by using a 3-bit TCI field in the scheduling DCI. The scheduling DCI can provide the spatial quasi-co-location (QCL) relationship between the DL-RS and PDSCH demodulation reference signal (DM-RS) ports. Specifically, the gNB configures a TCI state pool in higher-layer parameters (e.g., PDSCH-Config), which is associated with multiple candidate beams via Radio Resource Control (RRC). Then, the gNB activates candidate TCI states via Media Access Control (MAC) Control Element (CE) signaling to map these states to code points in the DCI field. Finally, the gNB indicates a TCI state for the DM-RS port of the PDSCH via DCI signaling.

[0129] Figure 1It also states that the UE can only apply the indicated beam after decoding the scheduled DCI and applying the Rx beam switching. Therefore, the UE needs sufficient time to decode the PDCCH, and a time offset equal to or greater than a predefined threshold, such as timeDurationForQCL, is required, where the threshold is based on the reported UE capability. Furthermore, in Relase-15 / 16, higher-layer parameters, such as tci-PresentInDCI / tci-PresentInDCI-ForFormat1_2, are set to "Enabled" for the CORESET of the scheduled PDSCH. For DL ​​beam indication, if a TCI field is present in the DCI, the time offset between the reception of the DL DCI and the corresponding PDSCH is equal to or greater than a predefined threshold, such as timeDurationForQCL, and the DM-RS of the PDSCH performs QCL with the DL-RS in the indicated TCI state. Otherwise, the predefined QCL assumption of the PDSCH, i.e., the default beam, is naturally used. When a TCI is present but the time offset between the received DL DCI and the corresponding PDSCH is less than a predefined threshold, such as timeDurationForQCL, the UE assumes the QCL of the lowest controlResourceSetId in the latest time slot containing one or more CORESETs within the active bandwidth portion (BWP) of the serving cell. In some cases, the TCI field does not always appear in the DCI. If the TCI field is not present in the DCI, the QCL assumption of the PDSCH follows the CORESET transmitted via PDCCH.

[0130] In version 15, spatial relation information is configured by higher-level parameters, such as spatialRelationInfo for uplink (UL) beam indication. This spatial relation information provides the RS, which the UE uses to form a UL transmission (TX) beam for a target signal for which spatial relation information has been configured. For the Physical Uplink Control Channel (PUCCH) and Sounding Reference Signal (SRS), spatial relation information can provide direct spatial assumptions, while for the Physical Uplink Channel (PUSCH), the UE indirectly obtains spatial relation information from the PUCCH (PUSCH scheduled using DCI format 0_0) or SRS resources. However, in versions 15 / 16, the DL and UL beam indication mechanisms are designed separately. This can present problems such as latency and signaling overhead due to the need for two sets of RRC and MAC CE signaling to configure and indicate the beams of the PDSCH and PUSCH.

[0131] In current technology, the PDSCH indication is scheduled by the DCI format of the PDCCH transmitted on the CORESET, while for the UL indication, the SRS and PUCCH beam indications can be directly obtained through SpatialRelationInfo and PUCCH-SpatialRelationInfo, respectively. Unlike SRS and PUCCH, the PUSCH beam is indicated by the Scheduling Request Indicator (SRI) in the DCI. In Release 15 / 16, DL and UL beams are indicated separately, meaning the gNB uses different signaling configurations for TCI and SpatialRelationInfo. A unified TCI frame is introduced to eliminate large signaling overhead. Furthermore, according to the future work project of Relase-17, due to the limitations of the radio frequency (RF) analog beam control components, and the enhanced beam limiting of DL reception and UL transmission, it is difficult for the UE to use different beams to receive and transmit signals for different physical channels. Therefore, in some embodiments of the present invention, it is advantageous to design a common beam for DL ​​and UL beam indications.

[0132] Similar to Release 15 / 16, the default beam supports PDCCH, PDSCH, PUCCH, PUSCH, and SRS. When tci-PresentInDCI is absent or the scheduling offset is less than the threshold timeDurationForQCL, the default beam is the QCL assumption of the lowest controlResourceSetId in the latest time slot monitored by the UE in the TCI state. When the UE is provided with enableDefaultBeamPlForPUSCH0_0, enableDefaultBeamPlForSRS, or enableDefaultBeamPlForPUCCH, the default beam is the QCL assumption of the CORESET with the lowest controlResourceSetId. As can be seen from the above, multiple DL and UL channels can apply a single default beam indicated by the gNB to reduce the signaling overhead of beam indication. However, in Release 15 / 16, the design of the default beam is complex and not suitable for all situations because the RS of the DL and UL default beams are not always aligned, which may cause ambiguity for the UE regarding the implementation of the common beam.

[0133] Some embodiments of this invention propose methods for a unified TCI framework for DL ​​and UL beam indication. Some embodiments of this invention provide a unified common beam design for DL ​​reception and UL transmission in multi-beam operation. In this disclosure, several solutions are proposed to support a unified common beam indication design, including joint common beam indication design scenarios, separate common beam indication design scenarios, and hybrid common beam indication design scenarios. Furthermore, a default common beam indication design scenario is also considered and proposed. The unified common beam design includes common beam identification design and common beam indication. For all three cases, the mapping between the configuration beam and the number of bits, or the mapping between the configuration beam and the time slots of the uplink signal received by the base station (e.g., gNB), aims to distinguish whether the configuration beam is a common beam. Then, methods are proposed to determine the common beam for different scenarios when the common beam in the transmission configuration indication (TCI) is absent.

[0134] The beneficial effects of some embodiments of the present invention include at least one of the following: 1. Defining a unified common beam indication for uplink and downlink in multi-beam transmission, considering different common beam indication scenarios. 2. Proposing several common beam identification designs to distinguish whether the indicated mean is a common beam, and proposing different common beam indication methods for different scenarios.

[0135] Figure 2 The illustration shows one or more user equipment (UE) 10 and base station (e.g., gNB) 20 provided in some embodiments of the present invention for communication in a communication network system 30. The communication network system 30 is, for example, a multiple-input multiple-output (MIMO) system. The communication network system 30 includes one or more UEs 10 and a base station 20. One or more UEs 10 may include a memory 12, a transceiver 13, and a processor 11 coupled to the memory 12 and transceiver 13. The base station 20 may include a memory 22, a transceiver 23, and a processor 21 coupled to the memory 22 and transceiver 23. The processor 11 or 21 may be configured to implement the suggested functions, procedures, and / or methods described herein. A radio interface protocol layer may be implemented in the processor 11 or 21. The memory 12 or 22 is operatively coupled to the processor 11 or 21 and stores various information to operate the processor 11 or 21. The transceiver 13 or 23 is operatively coupled to the processor 11 or 21 and transmits and / or receives radio signals.

[0136] Processor 11 or 21 may include application-specific integrated circuits (ASICs), other chipsets, logic circuits, and / or data processing devices. Memory 12 or 22 may include read-only memory (ROM), random access memory (RAM), flash memory, memory cards, storage media, and / or other storage devices. Transceiver 13 or 23 may include baseband circuitry for processing radio frequency signals. When embodiments are implemented in software, the techniques described herein can be implemented using modules (e.g., procedures, functions, etc.) that perform the functions described herein. Modules may be stored in memory 12 or 22 and executed by processor 11 or 21. Memory 12 or 22 may be implemented within or outside processor 11 or 21, in which case they may be communicatively coupled to processor 11 or 21 in various ways known in the art.

[0137] In some embodiments, the processor 11 is configured to determine one or more Transmission Configuration Indication (TCI) states from the base station 20, wherein the one or more TCI states include one or more reference signals (RS); determine one or more beams from the base station 20, wherein the one or more beams are used for multi-beam operation; identify one or more common beams from the one or more beams based on the one or more RSs; and use the one or more common beams for downlink (DL) reception and uplink (UL) transmission in the multi-beam operation. This can solve the problems in the prior art by defining a unified common beam indication for data and controlling the transmission / reception of DL and UL in multi-beam operation, enhancing the common beam design for data and control transmission / reception of DL and UL in multi-beam operation, providing good communication performance, and / or providing high reliability.

[0138] In some embodiments, the processor 21 is configured to configure one or more Transmission Configuration Indication (TCI) states to the UE 20, wherein the one or more TCI states include one or more reference signals (RS); configure one or more beams to the UE 20, wherein the one or more beams are used for multi-beam operation; identify one or more common beams from the one or more beams based on the one or more RSs; and use the one or more common beams for downlink (DL) reception and uplink (UL) transmission in the multi-beam operation. This can solve the problems in the prior art by defining a unified common beam indication for data and controlling the transmission / reception of DL and UL in multi-beam operation, enhancing the common beam design for data and control transmission / reception of DL and UL in multi-beam operation, providing good communication performance, and / or providing high reliability.

[0139] Figure 3The illustration shows a method 200 for common beam determination performed by a user equipment (UE) according to an embodiment of the present invention. In some embodiments, method 200 includes: step 202, the UE determines one or more Transmission Configuration Indication (TCI) states from a base station, wherein the one or more TCI states include one or more reference signals (RS); step 204, the UE determines one or more beams from the base station, wherein the one or more beams are used for multi-beam operation; step 206: the UE identifies one or more common beams from the one or more beams based on the one or more RSs; step 208: the UE uses the one or more common beams for downlink DL reception and uplink UL transmission in the multi-beam operation. This can solve the problems in the prior art, define a unified common beam indication for data and control the transmission / reception of DL and UL in multi-beam operation, enhance the common beam design for data and control transmission / reception of DL and UL in multi-beam operation, provide good communication performance, and / or provide high reliability.

[0140] Figure 4 The illustration depicts a method 300 for common beam determination performed by a base station according to an embodiment of the present invention. In some embodiments, method 300 includes: step 302, the base station configuring one or more Transmission Configuration Indication (TCI) states to a user equipment (UE), wherein the one or more TCI states include one or more reference signals (RS); step 304, the base station configuring one or more beams to the UE, wherein the one or more beams are used for multi-beam operation; step 306: the base station identifying one or more common beams from the one or more beams based on the one or more RSs; and step 308: the base station using the one or more common beams for downlink (DL) reception and uplink (UL) transmission in the multi-beam operation. This can solve the problems in the prior art, define a unified common beam indication for data and control the transmission / reception of DL and UL in multi-beam operation, enhance the common beam design for data and control transmission / reception of DL and UL in multi-beam operation, provide good communication performance, and / or provide high reliability.

[0141] In one embodiment of the invention, the one or more common beams are indicated according to the one or more RSs associated with the one or more beams. In one embodiment of the invention, the base station is configured with only one TCI state. In one embodiment of the invention, when there is only one RS in a TCI state, the RS is associated with the common beam of both the DL reception and / or the UL transmission in the multi-beam operation. In one embodiment of the invention, the RS includes a DL RS and / or a UL RS. In one embodiment of the invention, the DL RS includes a Channel State Information (CSI) RS. In one embodiment of the invention, the UL RS includes a Sounding Reference Signal (SRS). In one embodiment of the invention, the common beam is indicated using Radio Resource Control (RRC) signaling and Media Access Control (MAC) Control Element (CE) signaling. In one embodiment of the invention, the TCI state is activated by MAC CE signaling, and the Downlink Control Information (DCI) field is used to indicate the beam in a TCL state. In one embodiment of the invention, when the indicator beam in the TCI state is not the common beam, and if there are other common beams associated with the RS in the TCI state, the UE uses the common beam with the lowest index in the TCI state for the DL reception and UL transmission in the multi-beam operation. In another embodiment of the invention, when the UE is configured with the beam associated with the RS in the TCI state, the method further includes the UE determining a mapping between the beam and the RS.

[0142] In one embodiment of the present invention, the UE identifying the one or more common beams from the one or more beams based on the one or more RS includes: the UE identifying the one or more common beams from the beams based on the mapping between the beams and the RS. In one embodiment of the present invention, the RS includes parameters, the parameters including at least one of the following: number of bits; or time slot of the UL signal received by the base station. In one embodiment of the present invention, the UE determines the mapping between the beams and the RS through system information. In one embodiment of the present invention, the UE identifying the one or more common beams from the beams based on the mapping between the beams and the RS includes: the UE performing beam measurement on the beams based on the mapping between the beams and the RS; the UE reporting the beam measurement to the base station; the UE receiving a first indication of the one or more common beams from the base station, wherein the first indication of the one or more common beams includes a first selection of the one or more common beams by the base station based on the beam measurement. In one embodiment of the present invention, the UE identifies one or more common beams from the beams according to the mapping between the beam and the RS, including: the UE performing a UL beam scan; the UE sending the UL RS configured by the TCI state to the base station; and the UE receiving a second indication of the one or more common beams from the base station, wherein the second indication of the one or more common beams includes a second selection of the one or more common beams by the base station according to the UL RS.

[0143] In one embodiment of the invention, the one or more common beams depend on the associated UL RS, wherein the UL RS is the most recently received signal by the base station. In one embodiment of the invention, the TCI state is activated by MACCE signaling, and the downlink control information (DCI) field is applied to indicate that the one or more beams are in the one or more TCI states during the scheduling time. In one embodiment of the invention, when one or more indicated beams in the one or more TCI states during the scheduling time are not the one or more common beams, in the multi-beam operation, the UE uses the most recently indicated common beam for DL ​​reception and UL transmission before the scheduling time. In one embodiment of the invention, the method is performed in a joint common beam indication mode, a separate common beam indication mode, a hybrid common beam indication mode, or a default common beam indication mode.

[0144] In one embodiment of the invention, when the method is executed in the joint common beam indication mode, the UE uses the same common beam for both DL reception and UL transmission in the multi-beam operation. In another embodiment of the invention, for the joint common beam indication mode, both DL reception and UL transmission are indicated by only one common beam, and when only one RS is in a single TCI state, that RS is associated with the common beam used for both DL reception and UL transmission. In another embodiment of the invention, the RS is either the DL RS or the UL RS.

[0145] In one embodiment of the invention, for the joint common beam indication method, a combination of K beams associated with a flag is used to identify the common beam, where K is greater than 1. In one embodiment of the invention, if several of the K beams are the common beam, the common beam is determined using the flag value corresponding to each beam. In one embodiment of the invention, if the DL RS provides the common beam, the base station selects the beam associated with the number of bits in the flag via a reported CSI from the UE; if the UL RS provides the common beam, the base station selects the beam associated with the number of bits in the flag via an SRS from the UE. The selected beam depends on the associated uplink signal received at the base station in the most recently received signal including the reported CSI or the SRS. The combination of the K beams and the flag is used to identify whether the indicated beam is the common beam. In one embodiment of the present invention, for the joint common beam indication method, each beam is used for one time slot unit, and the base station selects the beam by the most recently received signal including CSI or SRS reports. Each signal received by the base station corresponds to a time slot, and the base station identifies whether the selected beam is the common beam by the correspondence between the time slot and the beam.

[0146] In one embodiment of the invention, when the method is executed in the separated common beam indication mode, in the multi-beam operation, the UE applies independent common beams for the DL reception and the UL transmission, respectively. In one embodiment of the invention, one or more RSs in M ​​TCIs provide a quasi-co-location QCL assumption for the DL reception, one or more RSs in N TCIs provide a spatial filter for the UL transmission, and one or more candidate common beams for the DL reception and the UL transmission are respectively included in the M TCIs and the N TCIs, where M is greater than or equal to 1 and N is greater than or equal to 1. In one embodiment of the invention, for the DL reception or the UL transmission, when there is only one TCI state, the TCL state includes only one RS to provide the QCL assumption for the DL reception or the spatial filter for the UL transmission, and the beam associated with the RS is the common beam for the DL reception or the UL transmission in the multi-beam operation. In one embodiment of the invention, when the RS is associated with a plurality of K DL beams and L UL beams contained in the TCI state, the RS is configured to indicate whether the K×L beam pairs include the one or more common beams.

[0147] In one embodiment of the invention, when the method is executed in the separated common beam indication mode and when only one TCI state contains only one RS providing a reference for the QCL or the spatial filter, the beam associated with the RS is the common beam used for the DL reception or the UL transmission. In one embodiment of the invention, when the method is executed in the separated common beam indication mode and when the base station performs beam scanning, the UE performs beam measurement. After measuring the beam, the UE transmits the UL RS to the base station at the time slot location associated with the measured beam. The base station measures the UL RS and selects the optimal UL beam to obtain a beam pair. In one embodiment of the invention, when the method is executed in the separated common beam indication mode and there is only one TCI state, both the DL beam associated with the DL RS and the UL beam associated with the UL RS are configured in the TCI state. In one embodiment of the invention, when the method is executed in the separated common beam indication mode and there is only one TCI state, and if the indicated DL beam and the indicated UL beam of the indicated beam pair are not the DL common beam and the UL common beam, the UE uses the common beam with the lowest beam pair index for the DL reception and the UL transmission in the multi-beam operation in the TCI state.

[0148] In one embodiment of the invention, when the method is executed in the separated common beam indication mode and there is only one TCI state, if the indicated beam pair is not the common beam, but the indicated DL beam or indicated UL beam in the indicated beam pair is a DL common beam or a UL common beam, the UE uses the common beam with the lowest beam pair index for DL ​​and UL indication in the TCI state, wherein the lowest beam pair includes the DL or UL common beam associated with the indicated common beam pair. In one embodiment of the invention, when the method is executed in the separated common beam indication mode, when the UE is configured with multiple TCI states, when the common beam is not present in the indicated TCI state, and if neither the indicated DL beam nor the indicated UL beam of the indicated beam pair is a DL common beam or a UL common beam, the UE performs the DL reception and the UL transmission using the latest indicated common beam before the scheduling time. In one embodiment of the invention, when the method is executed in the separated common beam indication mode, when the UE is configured with multiple TCI states, when the common beam is not present in the indicated TCI state, and if the DL beam or UL beam of the indicated common beam pair is the common beam, the UE performs the DL reception and the UL transmission using the latest indicated common beam before the scheduling time, wherein the indicated common beam includes the DL or UL common beam associated with the indicated common beam pair during the scheduling time. In one embodiment of the invention, when the method is executed in the hybrid common beam indication mode, the UE uses a first type of common beam and a second type of common beam, wherein the first type of common beam is configured for the DL reception and the UL transmission in the multi-beam operation, and the second type of common beam is configured only for the DL reception or the UL transmission in the multi-beam operation.

[0149] In one embodiment of the invention, one or more RSs configured in one or more TCLs provide the first type of common beam and the second type of common beam. In one embodiment of the invention, when the RS is associated with multiple K DL beams and L UL beams, an S beam is applied to the DL reception and UL transmission included in the TCI state, and the RS is configured to indicate whether a K multiplied by L plus S beam pair includes one or more common beams. In one embodiment of the invention, the first type of common beam and the second type of common beam have different priorities. In one embodiment of the invention, the first type of common beam has a higher priority than the second type of common beam. In one embodiment of the invention, when the common beam does not exist in the TCI state, the first type of common beam and the second type of common beam with higher priority included in the TCI state indicated by the most recent scheduling time are considered as the common beam. In one embodiment of the invention, the base station configures a time window for the UE to distinguish whether the common beam or the common beam pair is valid. In one embodiment of the present invention, if the first type of common beam is present not only during the window period, the UE uses the common beam with the lowest index in the TCI state for the DL reception and UL transmission in the multi-beam operation; and / or if the window period contains only the second type of common beam, the UE uses the common beam with the lowest beam pair index in the TCI state for the DL reception and UL transmission in the multi-beam operation.

[0150] In one embodiment of the invention, when the method is executed in the hybrid common beam indication mode, K multiplied by L beam pairs are obtained by combining K DL beams associated with multiple DL RSs and L UL beams associated with multiple UL RSs, and a total of K multiplied by L plus S beams / pairs are available for the DL reception and the UL transmission. In one embodiment of the invention, when the method is executed in the hybrid common beam indication mode, if there is a selected beam with an index from the first beam to the s-th beam, the UE measures the beam with the RS to provide the common beam only for the DL reception or the UL transmission; and / or if there is a selected beam with an index from the first beam pair to K multiplied by the L-th beam pair, the UE measures the beam with the RS to provide the common beam for the DL reception and the UL transmission. In one embodiment of the invention, when the method is executed in the default common beam indication mode, when the DL and UL default beams are aligned, the UE uses one or more default common beams as the one or more common beams. In one embodiment of the invention, the one or more default common beams include the latest common beam with the lowest index included in one of the scheduling times. In the following embodiments, the first beam refers to beam1, and the s-th beam refers to the beam in the following embodiments.

[0151] In some embodiments, the unified common beam design for DL ​​and UL beam indication includes a joint common beam indication mode, a separate common beam indication mode, and a hybrid common beam indication mode. For the joint common beam indication mode, different DL and UL channels use the same common beam. For separate common beam indication, independent common beams are applied for DL ​​and UL indication respectively; for example, one common beam is used for DL ​​transmission. For hybrid common beam indication, two common beams are configured for both downlink and uplink, i.e., one common beam is configured for both downlink and uplink, while another type of ordinary beam is configured only for DL ​​or UL indication. Furthermore, a default common beam indication mode is also considered and proposed. Regarding the unified common beam design for DL ​​and UL beam indication, this design is based on a common beam identification design and a common beam indication design. Furthermore, in some embodiments of the invention, beams are all associated with RS. One RS can represent one beam, but a beam can be represented by multiple RSs, and the RS indication of the beam is indicated by TCI. In other words, the source reference RS in TCI state provides a common beam for DL ​​reception (e.g., PDSCH reception), where TCI is indicated by QCL.

[0152] Joint common beam indication of DL and UL:

[0153] For joint common beam indication, DL and UL transmissions are indicated by only one common beam. For joint common beam indication, the source RS in the TCI state provides a common beam for PDSCH reception and PUSCH transmission. The beam indication directly references the associated source reference RS without loss of generality. Some embodiments assume that K (K≥1) beams are configured for multi-beam transmission. When only one source RS is in a single TCI state, i.e., K=1, the source RS is associated with the common beam used for DL ​​and UL transmissions, where the source RS can be a DL RS (e.g., CSI_RS) or a UL RS (e.g., SRS).

[0154] Common beam identification design:

[0155] In some embodiments, the gNB and UE are configured with multiple beams associated with multiple RSs, i.e., K > 1. In this scenario, some embodiments introduce a set flag = {flag1, flag2, ..., flagK} to distinguish whether the indicated beam is a common beam. Specifically, some embodiments associate the parameter flagi with the i-th beam, which, for simplicity, is further denoted as beami, where i = 1, 2, ..., K. If beami is a common beam, some embodiments set flagi = 1; otherwise, flagi = 0. As shown in Table 1, there are multiple candidate common beams, and beam2, beam3, and beamK, associated with flag2 = 1, flag3 = 1, and flagK = 1, are candidate common beams.

[0156] Table 1:

[0157] Beam Index logo <![CDATA[Beam1]]> <![CDATA[flag1=0]]> <![CDATA[Beam2]]> <![CDATA[flag2=1]]> <![CDATA[Beam3]]> <![CDATA[flag3=1]]> …… …… <![CDATA[Beam K-1 ]]> <![CDATA[flag K-1 =0]]> <![CDATA[Beam K ]]> <![CDATA[flag K =1]]>

[0158] One advantage of some embodiments is that the common beam can be easily identified through the combination of K beams associated with the flag. Without the definition of the flag, the UE may confuse the common beam with other beams.

[0159] The relationship between the beam index and the flag value, as well as the relationship between the beam index and the time slot index (as shown in Table 2), is communicated to the UE via system information. Upon receiving a beam scan from the gNB, the UE performs a CSI measurement and then reports the measurement result to the gNB. Based on the reported CSI measurement, the gNB selects the beam associated with the number of bits in the flag. Since one or more UL RSs (i.e., SRSs) are configured in the TCI state, when the UE performs a UL beam scan, the uplink signal received by the gNB is the SRS, not the reported CSI measurement. The proposed design can also be applied to scenarios where, after measuring the SRS received from the UE, the gNB sends an SRS Resource Indicator (SRI) to indicate the indicated beam to the UE. The indicated beam depends on the associated uplink signal, which is the signal most recently received by the base station.

[0160] Furthermore, for joint beam identification, some embodiments propose a design based on a time-domain resource allocation field to distinguish whether the indicated beam is a common beam. Multiple source RSs and multiple beams included in the TCI state are associated with multiple source RSs. Some embodiments also assume that K beams are configured for multi-beam transmission. K time slot locations are configured for DL ​​and UL transmission. Specifically, as shown in Table 2, some embodiments introduce a set slot = {slot1, slot2, ..., slotK}, where each parameter in slot refers to the time slot location assigned to the indicated beam.

[0161] Table 2:

[0162] Beam Index logo <![CDATA[Beam1]]> <![CDATA[slot1]]> <![CDATA[Beam2]]> <![CDATA[slot2]]> <![CDATA[Beam3]]> <![CDATA[slot3]]> …… …… <![CDATA[Beam K-1 ]]> <![CDATA[slot K-1 ]]> <![CDATA[Beam K ]]> <![CDATA[slot K ]]>

[0163] Similarly, for designs based on the time-domain resource allocation field, when the gNB performs a beam scan, the UE performs beam measurements and then reports them to the gNB at the time slot location associated with the measured beam. When the gNB receives the reported beam measurement (CSI measurement) at the time slot location, the gNB selects the associated beam. For UL scans, the UE sends a UL-RS to the gNB at the relevant time slot location to perform beam measurements. The indicated beam depends on the associated uplink signal, which is the signal most recently received by the gNB.

[0164] Common beam indication design:

[0165] In Relase-15 / 16NR, the gNB configures multiple TCI states for the UE via higher-layer parameters such as PDSCH-Config for multi-beam transmission. After activating one or more TCI states via MAC CE signaling, the DCI field is applied to indicate the beam used for DL ​​reception. When the UE is configured with one TCI state, beam indication can be achieved using only RRC signaling and MAC CE signaling. In other words, when one or more TCIs are activated, all configured RSs are activated, i.e., the provided beams are also activated. When the UE is configured with multiple TCI states, more than one TCI state is activated, and the DCI field carried by the PDCCH is used to schedule DL reception. That is, the DCI signaling selects a state, and the UE uses the beam associated with the RS configured with the selected TCI (indicated by the TCI in some embodiments of the present invention) in the scheduling DCI field.

[0166] If neither the indicated DL beam nor the indicated UL beam of the beam pair is a DL common beam or a UL common beam, the UE uses the common beam with the lowest beam pair index in the TCI state for DL ​​and UL indication. As shown in Table 5, when the index of the indicated beam pair is 2, it consists of DL Beam1 and UL beam2. Neither DL Beam1 nor UL beam2 is a common beam used for DL ​​and UL beam indication, and the beam pair with index L+1 is used as the common beam.

[0167] If the indicated beam pair is not a normal beam, but the indicating DL beam or UL beam of the indicating beam pair is a DL common beam or a UL common beam, the UE uses the common beam with the lowest beam pair index for DL ​​and UL indication in TCI state, where the lowest beam pair includes the DL or UL common beam associated with the indicated common beam pair. As shown in Table 5, when the index of the indicating beam pair is 2L+2, it consists of DL Beam3 and UL beam2, where DL Beam3 is the common beam of DL, and the beam pair with index 2L+1 is used as the common beam.

[0168] In some embodiments, when only one TCI state is configured by the gNB, if the indicated beam is not a common beam, and if other common beams associated with the reference RS exist in the TCI state, the UE uses the common beam with the lowest index in the TCI for DL ​​and UL indication. For example, it is also assumed that beam2, beam3, and beamK are common beams provided in the TCI. If the beam indicated in the beam index of both schemes (Tables 1 and 2) is beam4 (a non-common beam), since all beams are provided by the RS configured in the TCI, all beams are activated when the TCI is activated by MAC CE. The common beam with the lowest index among the active beams is selected, i.e., beam2. However, the beam indicated in the TCI state of the scheduling DCI does not always exist. When multiple TCI states are configured via RRC, a problem may arise if the RS in the TCI state does not provide any candidate common beams; that is, none of the RSs in the indicated TCI state are associated with a candidate common beam. In this case, RRC reconfiguration results in signaling overhead. In some embodiments, when the common beam is not present in the indicated TCI state, the UE performs DL reception and UL transmission using the most recently indicated common beam before the scheduling time. For example, as Figure 5 As shown, there is no common beam in the TCI at scheduling time n, and the UE uses the common beam indicated by time n-2.

[0169] Separate common beam indication for DL ​​and UL:

[0170] For separate common beam indication, some embodiments assume that the source RS in M ​​TCIs provides the QCL assumption for DL ​​transmission, while the source RS in N TCIs provides the spatial filter for UL transmission, where M>=1 and N>=1. Candidate common beams for DL ​​reception and UL transmission are included in M ​​TCIs and N TCIs, respectively.

[0171] Common beam identification design:

[0172] For DL ​​reception or UL transmission, when there is only one TCI state (i.e., M=N=1) containing only one source RS to provide a reference for the QCL or spatial filter, the beam associated with the source RS is the common beam used for DL ​​or UL transmission.

[0173] Now consider the case where each TCI state contains multiple source reference signals. In this case, both the TCI state for DL ​​indication and the TCI state for UL indication have multiple source RSs (i.e., DL-RS and UL-RS). Each DL (UL) beam directly points to its associated DL (UL) source RS. Some embodiments assume that the UE is configured with K DL beams and L UL beams. Some embodiments introduce a set of K parameters, DLCommonbeamflag, i.e., DLCommonbeamflag = {Dlflag1, Dlflag2, ..., DlflagK}, to indicate whether the indicated DL beam associated with the reference RS is a common beam, and a set of L parameters, ULCommonbeamflag, i.e., ULCommonbeamflag = {Ulflag1, Ulflag2, ..., UlflagL}, to indicate whether the indicated UL beam associated with the source RS is a common beam. For DL ​​(UL) transmission, some embodiments have flagi = 1 when the beam with index DL Beami (UL Beami) is a candidate common beam; otherwise, flagi = 0. As shown in Table 3, DL beam2, DL beam3, and DL beamK are candidate common beams for DL ​​transmission, and UL beam1 and UL beamL are candidate beams for uplink transmission. Note that K and L are not always the same.

[0174] Table 3:

[0175]

[0176]

[0177] By combining K DL beams associated with multiple DL RSs and L UL beams associated with multiple UL RSs, some embodiments can obtain a total of K×L beam pairs, six of which are common beams. As shown in Table 4, the set commonbeampairflag = {pairflag1,pairflag2,...,pairflagKL} is introduced to indicate whether the beam pair is a common beam.

[0178] Table 4:

[0179]

[0180] As shown in Table 4, a common beam pair flag is configured to indicate whether a beam pair is a common beam. When the gNB performs a beam scan, the UE performs beam measurement, selects the best beam, and reports it to the gNB. Simultaneously, the UE performs a UL beam scan, and the gNB measures the UL-RS received from the UE and selects the best beam. After the DL and UL scans, the beam pairs associated with the beam pair index are indicated based on the most recently received CSI report and the UL reference RS. The indicated beam pairs are configured with a common beam pair flag. In Table 4, beam pairs with Pairflagi=1, i=L+1, 2L, 2L+1, 3×L, (K-1)L+1, or K×L are explicitly indicated as common beams.

[0181] Furthermore, Table 5 illustrates the design for separate common beam identification based on the time-domain resource allocation domain. Multiple reference RSs exist, associated with multiple K DL beams and L UL beams contained in the TCI state. K×L time slot positions are used to indicate whether a beam pair is a common beam. Specifically, some embodiments introduce a set slot = {slot1, slot2, ..., slotKL}, where each parameter in the time slot refers to the time slot position allocated to beam transmission, and the beam index is associated with the K×L parameters in the time slot. Some embodiments also assume that DL beam2, DL beam3, and DL beamK associated with the DL reference RS are candidate common beams, and UL beam1 and UL beamL associated with the UL reference RS are candidate beams for UL transmission.

[0182] Table 5:

[0183]

[0184] For designs based on the time-domain resource allocation domain, when the gNB performs beam scanning, the UE performs beam measurement. After measuring the beam, the UE sends a UL reference RS to the gNB at the time slot location associated with the measured beam. The gNB measures the UL reference RS and selects the optimal UL beam, ultimately obtaining a beam pair. For example, when the UE measures DL beam2 and reports it to the gNB, the UE then sends a UL RS to the gNB from time slot L+1 to time slot 2×L to perform UL beam measurement. If the best UL beam is associated with time slot L+1 or time slot 2×L, the resulting beam pair is a common beam.

[0185] Common beam indication design:

[0186] Similar to the embodiments described above, when the UE is configured with one TCI state, beam indication can be achieved using only RRC signaling and MAC CE signaling. When the UE is configured with multiple TCI states, more than one TCI state is activated. The DL receives the TCI indication from the scheduling DCI field.

[0187] If neither the indicated DL beam nor the indicated UL beam of the beam pair is a DL common beam or a UL common beam, the UE uses the common beam with the lowest beam pair index in the TCI state for DL ​​and UL indication. As shown in Table 5, when the index of the indicated beam pair is 2, it consists of DL Beam1 and UL beam2. Neither DL Beam1 nor UL beam2 is a common beam used for DL ​​and UL beam indication, and the beam pair with index L+1 is used as the common beam.

[0188] If the indicated beam pair is not a common beam, but the indicating DL or UL beam of the indicated beam pair is a DL common beam or a UL common beam, the UE uses the common beam with the lowest beam pair index for DL ​​and UL indication in TCI state, where the lowest beam pair includes the DL or UL common beam associated with the indicated common beam pair. As shown in Table 5, when the index of the indicated beam pair is 2L+2, it consists of DL Beam3 and UL Beam2, where DL Beam3 is the common beam of DL, and the beam pair with index 2L+1 is used as the common beam.

[0189] The relationship between the beam pair index and the set common beam pair flag value, as well as the relationship between the beam pair index and the time slot index, can be communicated to the UE via system information. In some embodiments, when the UE is configured with multiple TCI states, the indicated TCI state is selected by the scheduling DCI field after the TCI state is activated. However, since the candidate common beam is provided by the reference RS in multiple TCI states configured via RRC, the indicated beam in the TCI state of the scheduling DCI does not always exist. If the reference RS in the indicated TCI state does not provide a common beam, a problem may occur, i.e., any reference RS in a TCI state is not associated with a candidate common beam. In this case, RRC reconfiguration results in signaling overhead. Figure 6 In the context of scheduling, when the indicated beam at time n is beam pair 1 and there is no candidate common beam in the indicated TCI state, the common beam indicated at time n-1 is used as the common beam. Therefore, when the common beam does not exist in the indicated TCI state, if neither the indicated DL beam nor the indicated UL beam of the indicated beam pair is a DL common beam or a UL common beam, the UE will use the latest indicated common beam to perform DL reception and UL transmission before the scheduling time.

[0190] In some embodiments, when the reference RS for DL ​​transmission and the reference RS for UL transmission are configured separately, the DL-RS is associated only with the DL candidate common beam, and the UL-RS is associated only with the UL candidate common beam. In this scenario, it may lead to the problem of the indicated beam pair including either the UL common beam or the DL common beam, for example, the beam pair indexed as 1 and the beam pair indexed as L+2 in Table 5. Figure 6 As shown, when the beam indicated in scheduling n is beam pair 1 and there is no candidate common beam in the TCI state, the common beam indicated in time slot n-2 is used as the common beam. Therefore, in some embodiments, when the common beam does not exist in the indicated TCI state, and the DL or UL beam of the indicated common beam pair is the common beam, the UE performs DL reception and UL transmission using the latest indicated common beam before scheduling time n, wherein the indicated common beam includes the DL or UL common beam associated with the indicated common beam pair in scheduling time n.

[0191] Hybrid common beam indication of DL and UL

[0192] For hybrid common beam indication, there are two types of common beam configurations for DL ​​and UL. One type of common beam is configured for both DL and UL, referred to as Type 1 for simplicity, while the other type of common beam is configured only for either DL or UL, referred to as Type 2 for simplicity. In other words, the RS configured in TCI provides a common beam for DL ​​reception, a common beam for UL transmission, and a common beam for both DL reception and UL transmission.

[0193] Common beam identification design:

[0194] Similar to the embodiments described above, multiple RSs are configured in TCI state, and multiple beams directly reference the associated RSs. The UE is configured with K DL beams and L UL beams. In addition, some embodiments assume that S beams can be used for DL ​​reception and UL transmission, where Kc is a common beam. Similar to Tables 3 and 4, it is assumed that DL beam2, DL beam3, and DL beamK are candidate common beams for DL ​​reception, and UL beam1 and UL beamL are candidate beams for uplink transmission. The K DL beams associated with multiple DL RSs and the L UL beams associated with multiple UL RSs are combined to obtain K×L beam pairs, of which 6 are common beams. Therefore, in some embodiments, a total of K×L+S beams (pairs) can be used for DL ​​and UL transmission, where Kc+6 are common beams (beam pairs).

[0195] As shown in Table 6, a set flag = {flag1, flag2, ..., flagKL+S} is introduced to indicate whether a beam or beam pair is a common beam. In some embodiments, flagi = 1 when the common beam with index Beami (Beam pairii) is a candidate common beam; otherwise, flagi = 0. Assuming Kc = 2, beam1 and beam2 are candidate common beams for DL ​​and UL transmissions.

[0196] Furthermore, some embodiments propose designs based on time-domain resource allocation fields. Similarly, K×L+S time slot positions are configured to distinguish whether beams (beam pairs) are common beams. Specifically, we introduce set slot = {slot1, slot2, ..., slotKL+S}, where each parameter in slot represents a time slot position, and the beam index is associated with the K×L parameter in the time slot.

[0197] Table 6:

[0198] Beam (beam pair) index logo Time slot <![CDATA[Beam pair1]]> <![CDATA[flag1=0]]> <![CDATA[slot1]]> <![CDATA[Beam pair2]]> <![CDATA[flag2=0]]> <![CDATA[slot2]]> …… … … <![CDATA[Beam pair KL ]]> <![CDATA[flag KL =1]]> <![CDATA[slot K×L ]]> <![CDATA[Beam1]]> <![CDATA[flag KL+1 =1]]> <![CDATA[slot K×L+1 ]]> <![CDATA[Beam2]]> <![CDATA[flag KL+2 =1]]> <![CDATA[slot K×L+1 ]]> <![CDATA[Beam 3]]> <![CDATA[flag KL+3 =0]]> <![CDATA[slot K×L+1 ]]> …… …… …… <![CDATA[Beam S ]]> <![CDATA[flag KL+S =0]]> <![CDATA[slot K×L+S ]]>

[0199] For hybrid common beam scenarios, the two common beam identification designs based on the introduction of flags and time-domain resource allocation fields are similar to the embodiments described above. When the gNB performs beam scanning, the UE performs beam measurement and selects the optimal beam. If the index of the selected beam is from Beam1 to BeamS, i.e., the UE measures the beam with RS, providing a common beam only for DL ​​or UL, the identification design is similar to the embodiments described above. If the index of the selected beam is from Beam pair1 to Beam pairKL, i.e., the UE uses RS to measure the beam, providing a common beam for DL ​​reception and UL transmission, the identification design is similar to the embodiments described above.

[0200] Standard beam pointing design:

[0201] Similar to the above embodiments, when the UE is configured with one TCI state, beam indication can be achieved using only RRC signaling and MAC CE signaling. When the UE is configured with multiple TCI states, multiple TCI states are activated, and the UE decodes the indicator beam associated with the RS carrying the scheduling DCI field.

[0202] If neither the indicated DL beam nor the indicated UL beam of the beam pair is a DL common beam or a UL common beam, the UE uses the common beam with the lowest beam pair index in the TCI state for DL ​​and UL indication. As shown in Table 5, when the index of the indicated beam pair is 2, it consists of DL Beam1 and UL beam2. Neither DL Beam1 nor UL beam2 is a common beam used for DL ​​and UL beam indication, and the beam pair with index L+1 is used as the common beam.

[0203] If the indicated beam pair is not a common beam, but the indicating DL or UL beam of the indicated beam pair is a DL common beam or a UL common beam, the UE uses the common beam with the lowest beam pair index for DL ​​and UL indication in TCI state, where the lowest beam pair includes the DL or UL common beam associated with the indicated common beam pair. As shown in Table 5, when the index of the indicated beam pair is 2L+2, it consists of DL Beam3 and UL Beam2, where DL Beam3 is the common beam of DL, and the beam pair with index 2L+1 is used as the common beam.

[0204] There may be two types of common beams in a TCI state. Therefore, it is necessary to distinguish the priorities of different types of common beams. To further reduce latency and signaling overhead, type 1 common beams are predefined as having a higher priority than type 2 common beams. The relationship between beam (beam pair) indices and commonbeampair flag values, the relationship between beam (beam pair) indices and slots, and the priorities of type 1 and type 2 common beams are communicated to the UE through system information.

[0205] If neither the indicated DL beam nor the indicated UL beam of the beam pair is a DL common beam or a UL common beam, the UE uses the common beam with the lowest beam pair index in the TCI state for DL ​​and UL indication. As shown in Table 5, when the index of the indicated beam pair is 2, it consists of DL Beam1 and UL beam2. Neither DL Beam1 nor UL beam2 is a common beam used for DL ​​and UL beam indication, and the beam pair with index L+1 is used as the common beam.

[0206] If the indicated beam pair is not a common beam, but the indicating DL or UL beam of the indicated beam pair is a DL common beam or a UL common beam, the UE uses the common beam with the lowest beam pair index for DL ​​and UL indication in TCI state, where the lowest beam pair includes the DL or UL common beam associated with the indicated common beam pair. As shown in Table 5, when the index of the indicated beam pair is 2L+2, it consists of DL Beam3 and UL beam2, where DL Beam3 is the common beam of DL, and the beam pair with index 2L+1 is used as the common beam.

[0207] A common beam in a TCI state is not always present. If the RS in a TCI state does not provide a common beam, a problem may arise where no RS in the active TCI state is associated with a candidate common beam. In this case, RRC reconfiguration results in signaling overhead. The two common beams with higher priority configurations included in the TCI state indicated by the latest scheduling time are considered common beams. Since type 1 or type 2 common beams do not always appear at the same time intervals—for example, the latest type 1 common beam may have been received a long time ago—it cannot be considered an applicable common beam. Therefore, the gNB configures a time window Tw for the UE to distinguish between them. Figure 7 Whether the common beam or beam pair is valid.

[0208] At scheduling time n, if a common beam is not present in the indicated TCI, the UE determines the common beam using the latest Type 1 indicated common beam before scheduling time n. If a Type 1 common beam is configured within time window Tw, for example... Figure 7 If the time window Tw contains not only type 1 common beams, the UE adopts the same scheme as in the above embodiment. If the time window Tw contains only type 2 common beams, the UE adopts the same scheme as in the above embodiment.

[0209] Default common beam indication for DL ​​and UL:

[0210] The default beam-based indication is typically used in Release-15 / 16. In Release-15 / 16, the default value for DL ​​reception is the QCL assumption of the monitored core set with the lowest index in the most recent time slot, while for the default PUCCH / PUSCH Tx beam, the UE references the TCI state of the configured core set with the lowest index. Therefore, the DL and UL default beams are not always aligned. Furthermore, the reference RS resources for both the DL and UL default beams in Release-15 / 16 are the DL RS, lacking flexibility.

[0211] In some embodiments, for the default beam indication design, due to the misalignment between the DL and UL default beams as proposed in Release-15 / 16, the default common beam can only be used as the common beam when the DL and UL default beams are aligned. Furthermore, considering the case where the DL and UL default beams are aligned, according to the rules for default beams in Release-15 / 16, the default common beam is the indication beam included in the TCI state of the latest scheduling time indication. For example, Figure 5In this context, the default common beam is beam1 indicated by time n-1, not the common beam. However, some embodiments may also obtain the default common beam if another common point does exist within scheduling time n; otherwise, the default common beam needs to be found before time n. Therefore, in some embodiments, the default common beam is the latest common beam with the lowest index contained within one of the scheduling times.

[0212] The commercial benefits of some embodiments are as follows: 1. Solving problems in the prior art. 2. Enhancing the common beam design for data and control transmission / reception in downlink (DL) and uplink (UL) in multi-beam transmission. 3. Defining a unified common beam indication for UL and DL in multi-beam transmission. 4. Considering different common beam indication scenarios. 5. Proposing several common beam identification designs to distinguish whether the indication mean is a common beam. 6. Proposing different common beam indication methods for different scenarios. 7. Providing good communication performance. 8. Providing high reliability. 9. Some embodiments of the present invention are applicable to 5G-NR chipset suppliers, V2X communication system development suppliers, automobile manufacturers (including cars, trains, trucks, buses, bicycles, motorcycles, helmets, etc.), drone manufacturers, smartphone manufacturers, public safety communication equipment manufacturers, and AR / VR device manufacturers (e.g., for gaming, conferences / seminars, educational purposes). Some embodiments of the present invention are combinations of "technologies / processes" that can be adopted in 3GPP specifications to create the final product. Some embodiments of the present invention propose technical mechanisms.

[0213] Figure 8 This is a block diagram of a system for wireless communication according to an embodiment of the present invention. The embodiments described herein can be implemented in the system using any suitably configured hardware and / or software. Figure 8 An example system 700 for one embodiment is shown, comprising radio frequency (RF) circuitry 710, baseband circuitry 720, application circuitry 730, memory / storage device 740, display 750, camera 760, sensor 770, and input / output (I / O) interface 780, all of which are coupled to each other at least as shown. The application circuitry 730 may include, for example, but not limited to, circuitry of one or more single-core or multi-core processors. The processor may include any combination of a general-purpose processor and a dedicated processor such as a graphics processor, application processor, etc. The processor may be coupled to the memory / storage device and configured to execute instructions stored in the memory / storage device to enable various applications and / or operating systems running on the system.

[0214] The baseband circuit 720 may include, for example, but not limited to, circuitry of one or more single-core or multi-core processors. The processor may include a baseband processor. The baseband circuitry can handle various radio control functions that enable communication with one or more radio networks via RF circuitry. Radio control functions may include, but are not limited to, signal modulation, encoding, decoding, RF shifting, etc. In some embodiments, the baseband circuitry can provide communication compatible with one or more radio technologies. For example, in some embodiments, the baseband circuitry may support communication with the Evolved Universal Terrestrial Radio Access Network (EUTRAN) and / or other Wireless Metropolitan Area Networks (WMAN), Wireless Local Area Networks (WLAN), and Wireless Personal Area Networks (WPAN). Embodiments in which the baseband circuitry is configured to support radio communication with more than one radio protocol may be referred to as a multi-mode baseband circuitry.

[0215] In various embodiments, the baseband circuit 720 may include circuitry that operates with a signal not strictly considered to be at the baseband frequency. For example, in some embodiments, the baseband circuitry may include circuitry that operates with a signal having an intermediate frequency (IF) between the baseband frequency and the radio frequency (RF). The RF circuitry 710 may use modulated electromagnetic radiation transmitted through a non-solid-state medium to achieve communication with a wireless network. In various embodiments, the RF circuitry may include switches, filters, amplifiers, etc., to facilitate communication with a wireless network. In various embodiments, the RF circuitry 710 may include circuitry that operates with a signal not strictly considered to be at the radio frequency (RF). For example, in some embodiments, the RF circuitry may include circuitry that operates with a signal having an intermediate frequency (IF) between the baseband frequency and the RF.

[0216] In various embodiments, the transmitter circuitry, control circuitry, or receiver circuitry discussed above with respect to user equipment, eNB, or gNB may be wholly or partially embodied in one or more of the RF circuitry, baseband circuitry, and / or application circuitry. As used herein, “circuit” may refer to, be part of, or include: a special-purpose integrated circuit (ASIC), electronic circuitry, a processor (shared, dedicated, or grouped) and / or memory (shared, dedicated, or grouped), combinational logic circuitry, and / or other suitable hardware elements that provide the described functionality. In some embodiments, the electronic device circuitry may be implemented in one or more software or firmware modules, or the functionality associated with the circuitry may be implemented by one or more software or firmware modules. In some embodiments, some or all of the components of the baseband circuitry, application circuitry, and / or memory / storage device may be implemented together on a system-on-a-chip (SOC). The memory / storage device 740 may be used to load and store, for example, messages and / or instructions for the system. The memory / storage device used in one embodiment may include any combination of suitable volatile memory such as dynamic random access memory (DRAM) and / or non-volatile memory such as flash memory.

[0217] In various embodiments, I / O interface 780 may include one or more user interfaces designed to enable user interaction with the system, and / or peripheral interface designed to enable peripheral components to interact with the system. User interfaces may include, but are not limited to, physical keyboards or keypads, touchpads, speakers, microphones, etc. Peripheral interface may include, but are not limited to, non-volatile memory ports, universal serial bus (USB) ports, audio jacks, and power interfaces. In various embodiments, sensor 770 may include one or more sensing devices to determine environmental conditions and / or location information related to the system. In some embodiments, sensors may include, but are not limited to, gyroscope sensors, accelerometers, proximity sensors, ambient light sensors, and positioning units. Positioning units may also be part of or interact with baseband and / or RF circuitry to communicate with components of positioning networks such as Global Positioning System (GPS) satellites.

[0218] In various embodiments, display 750 may include displays such as liquid crystal displays and touch screen displays. In various embodiments, system 700 may be a mobile computing device, such as, but not limited to, laptop computing devices, tablet computing devices, netbooks, ultrabooks, smartphones, etc. In various embodiments, the system may have more or fewer components and / or different architectures. Where appropriate, the methods described herein may be implemented as computer programs. Computer programs may be stored on storage media such as non-transitory storage media.

[0219] Those skilled in the art will understand that each of the units, algorithms, and steps described and disclosed in the embodiments of the present invention is implemented using electronic hardware or a combination of software and electronic hardware for a computer. Whether a function operates in hardware or software depends on the conditions of the application and the design requirements of the technical plan. Those skilled in the art can implement the functionality for each specific application in different ways, and such implementations should not exceed the scope of the present invention. Those skilled in the art will understand that they can refer to the operation of the systems, devices, and units in the embodiments mentioned above, as the operation of the systems, devices, and units mentioned above is substantially the same. For ease of description and simplicity, these operation processes will not be described in detail.

[0220] It should be understood that the systems, apparatuses, and methods disclosed in the embodiments of the present invention can be implemented in other ways. The above embodiments are merely exemplary. The division of units is based solely on logical function, while other divisions may exist in practice. It is possible for multiple units or elements to be combined or integrated in another system. Certain features may also be omitted or skipped. On the other hand, the mutual coupling, direct coupling, or communication coupling shown or discussed operates through some ports, apparatuses, or units, whether indirectly or communicatively by means of electrical, mechanical, or other kinds of means.

[0221] The units used for illustration as separate elements may or may not be physically separate. The units used for display may or may not be physical units, i.e., located in one location or distributed across multiple network units. Some or all of the units may be used depending on the purpose of the embodiment. Furthermore, each functional unit in each embodiment may be integrated into a processing unit, physically independent, or integrated into a processing unit together with two or more units.

[0222] If a software functional unit is implemented and used and sold as a product, it can be stored in a readable storage medium in a computer. Based on this understanding, the technical solutions proposed in this invention can be implemented substantially or partially as software products. Alternatively, a portion of a technical solution that is advantageous to conventional technology can be implemented as a software product. The software product in the computer is stored in a storage medium containing multiple commands for a computing device (e.g., a personal computer, server, or network device) to execute all or some of the steps disclosed in the embodiments of this invention. The storage medium includes a USB flash drive, a portable hard disk, read-only memory (ROM), random access memory (RAM), a floppy disk, or other types of media capable of storing program code.

[0223] Although the invention has been described in conjunction with embodiments considered to be the most practical and preferred embodiments, it should be understood that the invention is not limited to the disclosed embodiments, but is intended to cover various arrangements made without departing from the broadest interpretation of the appended claims.

Claims

1. A method for public beam determination by a user equipment (UE), characterized in that, Comprising: The UE determines one or more transmission configuration indication, TCI, states from a base station, wherein the one or more TCI states comprise one or more reference signals, RSs; The UE determines one or more beams from the base station, wherein the one or more beams are used for a multi-beam operation; The UE identifies one or more common beams from the one or more beams according to the one or more RSs; And The UE uses the one or more common beams for downlink, DL, reception and uplink, UL, transmission in the multi-beam operation; Wherein the one or more common beams are indicated according to the one or more RSs associated with the one or more beams; when there is only one RS in one TCI state, the RS is related to the common beams for both the DL reception and the UL transmission in the multi-beam operation; the RSs comprise DL RSs and UL RSs; the DL RSs comprise channel state information, CSI, RSs, and the UL RSs comprise sounding reference signals, SRSs; the common beams are indicated using radio resource control, RRC, signaling and medium access control, MAC, control element, CE, signaling, and all configured RSs are activated when the one or more TCIs are activated; Wherein the one or more common beams are identified by a joint relationship with the CSI RSs and SRSs configured in the one or more TCI states and are used as spatial QCL sources for both the DL and the UL after TCI state activation; the common beams are used to determine the beams used for the UL transmission without increasing independent uplink reference signal resources; the UE further updates beam selection according to the TCI states and the CSI RSs and SRSs associated therewith on the basis of the common beams for continuous DL reception and UL transmission in multiple time units.

2. The method of claim 1, wherein, There is only one TCI state configured by the base station.

3. The method of claim 1, wherein, The one TCI state is activated by MAC CE signaling, and a downlink control information, DCI, field is used to indicate the beam in one TCI state.

4. The method of claim 3, wherein, When the indicated beam in the one TCI state is not the common beam, and if there are other common beams associated with the RS in the TCI state, the UE uses the common beam with the lowest index in the TCI state for the DL reception and the UL transmission in the multi-beam operation.

5. The method of claim 1, wherein, When the UE is configured with the beam associated with the RS of the TCI state, the method further comprises that the UE determines a mapping between the beam and the RS.

6. The method of claim 5, wherein, The UE identifies the one or more common beams from the one or more beams according to the one or more RSs comprises that: The UE identifies the one or more common beams from the beam according to the mapping between the beam and the RS.

7. The method of claim 5, wherein, The RS comprises a parameter, and the parameter comprises at least one of: A number of bits; or A slot of a UL signal received by the base station.

8. The method of claim 5, wherein, The UE determines a mapping between the beams and the RSs through system information.

9. The method of claim 6, wherein, The UE identifies the one or more common beams from the beams according to the mapping of the beams and the RSs, including: The UE performs beam measurement on the beams according to the mapping of the beams and the RSs. The UE reports the beam measurement to the base station. The UE receives a first indication of the one or more common beams from the base station, wherein the first indication of the one or more common beams includes a first selection of the one or more common beams by the base station according to the beam measurement.

10. The method of claim 6, wherein, The UE identifies the one or more common beams from the beams according to the mapping of the beams and the RSs, including: The UE performs UL beam sweeping. The UE sends the TCI state configured UL RS to the base station; and The UE receives a second indication of the one or more common beams from the base station, wherein the second indication of the one or more common beams includes a second selection of the one or more common beams by the base station according to the UL RS.

11. The method of claim 10, wherein, The one or more common beams depend on the associated UL RS, wherein the UL RS is the most recently received signal by the base station.

12. The method of claim 5, wherein, The TCI state is activated by MAC CE signaling, and a downlink control information (DCI) field indicates that the one or more beams are in the one or more TCI states at a scheduling time.

13. The method of claim 12, wherein, When one or more of the one or more TCI states in the scheduling time are not the one or more common beams, in the multi-beam operation, the UE uses the latest indicated common beam before the scheduling time for the DL reception and the UL transmission.

14. The method of claim 1, wherein, The method is performed in a joint common beam indication mode, a separate common beam indication mode, a hybrid common beam indication mode, or a default common beam indication mode.

15. The method of claim 14, wherein, When the method is performed in the joint common beam indication mode, the UE uses the same common beam for the DL reception and the UL transmission in the multi-beam operation.

16. The method of claim 14, wherein, For the joint common beam indication mode, both the DL reception and the UL transmission are indicated by only one common beam, and when only one RS is in a single TCI state, the RS is related to the common beam used for the DL reception and the UL transmission.

17. The method of claim 16, wherein, The RS is the DL RS or the UL RS.

18. The method of claim 14, wherein, For the joint common beam indication mode, a combination of K beams associated with a flag is used to identify the common beam, wherein K is greater than 1.

19. The method of claim 18, wherein, If several beams of the K beams are the common beam, the common beam is determined by a flag value corresponding to each beam.

20. The method of claim 19, wherein, If the DL RS provides the common beam, the base station selects the beam associated with the number of bits in the flag by reporting CSI from the UE, if the UL RS provides the common beam, the base station selects the beam associated with the number of bits in the flag by SRS from the UE, the selected beam depends on the associated uplink signal received at the base station in the last received signal including the reported CSI or the SRS, K beams are used to identify whether the indicated beam is the common beam or not.

21. The method of claim 14, wherein, For the joint common beam indication mode, each beam is used for one time slot unit, the base station selects the beam by the last received signal including the reported CSI or the SRS, each signal received by the base station corresponds to one time slot, and the selected beam is identified as the common beam or not by the correspondence between the time slot and the beam.

22. The method of claim 14, wherein, When the method is performed in the separate common beam indication mode, in the multi-beam operation, the UE applies independent common beams for the DL reception and the UL transmission respectively.

23. The method of claim 22, wherein, Wherein the one or more RSs in the M TCI provide a quasi-co-location QCL assumption for the DL reception, the one or more RSs in the N TCI provide a spatial filter for the UL transmission, and one or more candidate common beams for the DL reception and the UL transmission are respectively contained in the M TCI and the N TCI, wherein M is greater than or equal to 1, and N is greater than or equal to 1.

24. The method of claim 22, wherein, For the DL reception or the UL transmission, when there is only one TCI state, the TCL state only includes one RS to provide a QCL assumption for the DL reception or a spatial filter for the UL transmission, and the beam associated with the RS is the common beam for the DL reception or the UL transmission in the multi-beam operation.

25. The method of claim 22, wherein, When the RS is associated with a plurality of K DL beams and L UL beams contained in the TCI state, the RS is configured to indicate whether KxL beam pairs include the one or more common beams.

26. The method of claim 14, wherein, When the method is performed in the separate common beam indication mode and when there is only one TCI state containing only one RS for QCL or spatial filter reference, the beam associated with the RS is the common beam for the DL reception or the UL transmission.

27. The method of claim 14, wherein, When the method is performed in the separate common beam indication mode and when the base station performs beam sweeping, the UE performs beam measurement, after measuring the beam, the UE sends the UL RS to the base station at the time slot position associated with the measured beam, the base station measures the UL RS and selects the best UL beam to obtain a beam pair.

28. The method of claim 14, wherein, When the method is performed in the separate common beam indication mode and there is only one TCI state, the DL beam associated with the DL RS and the UL beam associated with the UL RS are both configured in the TCI state.

29. The method of claim 14, wherein, When the method is performed in the separate common beam indication mode and there is only one TCI state, and if the indicated DL beam and the indicated UL beam of the indicated beam pair are neither a DL common beam nor a UL common beam, the UE uses the common beam with the lowest beam pair index for the DL reception and the UL transmission in the multi-beam operation in the TCI state.

30. The method of claim 14, wherein, When the method is performed in the separate common beam indication mode and there is only one TCI state, if the indicated beam pair is not the common beam, but the indicated DL beam or the indicated UL beam in the indicated beam pair is a DL common beam or a UL common beam, the UE uses the common beam with the lowest beam pair index for DL and UL indication in the TCI state, wherein the lowest beam pair includes the DL or UL common beam related to the indicated common beam pair.

31. The method of claim 14, wherein, When the method is performed in the separate common beam indication mode, when the UE is configured with multiple TCI states, when the common beam does not exist in the indicated TCI state, and if the indicated DL beam and the indicated UL beam of the indicated beam pair are neither a DL common beam nor a UL common beam, the UE performs the DL reception and the UL transmission using the latest indicated common beam before the scheduled time.

32. The method of claim 14, wherein, When the method is performed in the separate common beam indication mode, when the UE is configured with multiple TCI states, when the common beam does not exist in the indicated TCI state, and if the DL beam or the UL beam of the indicated common beam pair is the common beam, the UE performs the DL reception and the UL transmission using the latest indicated common beam before the scheduled time, wherein the indicated common beam includes the DL or UL common beam related to the indicated common beam pair within the scheduled time.

33. The method of claim 14, wherein, When the method is performed in the hybrid common beam indication mode, the UE uses a first type of common beam and a second type of common beam, wherein the first type of common beam is configured for the DL reception and the UL transmission in the multi-beam operation, and the second type of common beam is configured only for the DL reception or the UL transmission in the multi-beam operation.

34. The method of claim 33, wherein, One or more RSs configured in one or more TCLs provide the first type of common beam and the second type of common beam.

35. The method of claim 33, wherein, When the RS is associated with a plurality of K DL beams, L UL beams, and S beams are applied to the DL reception and the UL transmission included in the TCI state, the RS is configured to indicate whether K times L plus S beam pairs include one or more common beams.

36. The method of claim 33, wherein, The first type of common beam and the second type of common beam have different priorities.

37. The method of claim 36, wherein, The priority of the first type of common beam is higher than that of the second type of common beam.

38. The method of claim 36, wherein, when the common beam in the TCI state does not exist, the first type of common beam and the second type of common beam contained in the TCI state of the latest scheduling time indication are considered as the common beam.

39. The method of claim 36, wherein, The base station configures a time window for the UE to distinguish whether the common beam or the pair of common beams is valid.

40. The method of claim 36, wherein, If there is only the first type of common beam in the window time, the UE uses the common beam with the lowest index in the TCI state for the DL reception and the UL transmission in the multi-beam operation; and / or if the window time only contains the second type of common beam, the UE uses the common beam with the lowest beam pair index in the TCI state for the DL reception and the UL transmission in the multi-beam operation.

41. The method of claim 14, wherein, When the method is performed in the hybrid common beam indication mode, K times L beam pairs are obtained by combining K DL beams associated with a plurality of DL RS and L UL beams associated with a plurality of UL RS, and there are K times L plus S beams / pairs in total available for the DL reception and the UL transmission.

42. The method of claim 14, wherein, When the method is performed in the hybrid common beam indication mode, if there is one selected beam, the index of which is from the first beam to the s-th beam, the UE measures the beam with the RS, only provides the common beam for the DL reception or the UL transmission; and / or if there is a selected beam with an index from the first beam pair to the K times the L-th beam pair, the UE measures the beam with the RS, and provides the common beam for the DL reception and the UL transmission.

43. The method of claim 14, wherein, When the method is performed in the default common beam indication mode, when the DL and UL default beam pairs are aligned, the UE uses one or more default common beams as the one or more common beams.

44. The method of claim 43, wherein, The one or more default common beams include the latest common beam with the lowest index contained in one of the scheduling times. 45.A method for public beam determination by a base station, the method comprising: Comprising: The base station configures one or more transmission configuration indication (TCI) states for a user equipment (UE), wherein the one or more TCI states include one or more reference signals (RSs); The base station configures one or more beams for the UE, wherein the one or more beams are used for multi-beam operation; The base station identifies one or more common beams from the one or more beams according to the one or more RSs; and The base station configures one or more transmission configuration indication (TCI) states for a user equipment (UE), wherein the one or more TCI states include one or more reference signals (RSs); The base station configures one or more beams for the UE, wherein the one or more beams are used for multi-beam operation; The base station identifies one or more common beams from the one or more beams according to the one or more RSs; and The base station uses the one or more common beams for downlink, DL, reception and uplink, UL, transmission in the multi-beam operation; wherein the one or more common beams are indicated according to the one or more RSs associated with the one or more beams; when there is only one RS in one TCI state, the RS is related to the common beams for both the DL reception and the UL transmission in the multi-beam operation; the RSs include DL RSs and UL RSs; the DL RSs include channel state information, CSI, RSs, and the UL RSs include sounding reference signals, SRSs; the common beams are indicated using radio resource control, RRC, signaling and medium access control, MAC, control element, CE, signaling, and when the one or more TCIs are activated, all configured RSs are activated; wherein the one or more common beams are identified by a joint relationship with the configured CSI RSs and SRSs in the one or more TCI states, and are used as spatial QCL sources for both the DL and the UL after the TCI states are activated; the common beams are used to determine the beams used for the UL transmission without increasing independent uplink reference signal resources; the UE further updates beam selection based on the TCI states and the CSI RSs and SRSs associated therewith for continuous DL reception and UL transmission in multiple time units on the basis of the common beams.

46. The method of claim 45, wherein, The base station configures only one TCI state.

47. The method of claim 44, wherein, The one TCI state is activated by MAC CE signaling, and a downlink control information, DCI, field is used to indicate the beam in the one TCI state.

48. The method of claim 47, wherein, When the indicated beam in the one TCI state is not the common beam, and if there are other common beams associated with the RS in the TCI state, the UE uses the common beam with the lowest index in the TCI state for the DL reception and the UL transmission in the multi-beam operation.

49. The method of claim 48, wherein, When the method is performed in a joint common beam indication mode, the UE uses the same common beam for the DL reception and the UL transmission in the multi-beam operation.

50. The method of claim 49, wherein, The base station identifies the one or more common beams from the one or more beams according to the one or more RSs, including: The base station identifies the one or more common beams from the beams according to the mapping of the beams to the RSs.

51. The method of claim 49, wherein, The RSs include parameters, the parameters including at least one of: a number of bits; or a slot of an UL signal received by the base station.

52. The method of claim 49, wherein, The base station determines the mapping between the beams and the RSs through system information.

53. The method of claim 50, wherein, The base station identifies the one or more common beams from the beams according to the mapping of the beams to the RSs, including: The base station receives beam measurements of the beams according to the mapping of the beams to the RSs transmitted by the UE; and The base station receives beam measurements of the beams according to the mapping of the beams to the RSs transmitted by the UE; and The base station sends a first indication of the one or more common beams to the UE, wherein the first indication of the one or more common beams comprises a first selection of the one or more common beams by the base station according to the beam measurements.

54. The method of claim 50, wherein, The base station identifies the one or more common beams from the beams according to the mapping of the beams to the RSs comprises: The base station receives a configuration of UL RSs in the TCI states from the UE; The base station measures the UL RSs from the UE; and The base station sends a second indication of the one or more common beams to the UE, wherein the second indication of the one or more common beams comprises a second selection of the one or more common beams by the base station according to the UL RSs.

55. The method of claim 54, wherein, The one or more common beams depend on the associated UL RSs, wherein the UL RSs are the most recently received signals by the base station.

56. The method of claim 45, wherein, The TCI states are activated by MAC CE signaling, and a downlink control information (DCI) field indicates that the one or more beams are in the one or more TCI states for a scheduling time.

57. The method of claim 56, wherein, When one or more of the one or more TCI states in the scheduling time indicates beams that are not the one or more common beams, in the multi-beam operation, the UE uses the latest indicated common beams for the DL reception and the UL transmission before the scheduling time.

58. The method of claim 45, wherein, The method is performed in a joint common beam indication mode, a separate common beam indication mode, a hybrid common beam indication mode, or a default common beam indication mode.

59. The method of claim 58, wherein, When the method is performed in the joint common beam indication mode, the UE uses the same common beams for the DL reception and the UL transmission in the multi-beam operation.

60. The method of claim 58, wherein, For the joint common beam indication mode, both the DL reception and the UL transmission are indicated by only one common beam, and when there is only one RS in a single TCI state, the RS is associated with the common beam for the DL reception and the UL transmission.

61. The method of claim 60, wherein, The RS is the DL RS or the UL RS.

62. The method of claim 58, wherein, For the joint common beam indication mode, a combination of K beams associated with a flag is used to identify the common beams, where K is greater than 1.

63. The method of claim 62, wherein, If several beams of the K beams are the common beams, the common beams are determined by the flag values corresponding to each beam.

64. The method of claim 63, wherein, If the DL RS provides the common beams, the base station selects beams associated with a number of bits in the flag by reporting CSI from the UE, and if the UL RS provides the common beams, the base station selects beams associated with a number of bits in the flag by SRS from the UE, and the selected beams depend on the associated uplink signals received at the base station in the most recently received signals including the reporting CSI or the SRS, and a combination of K beams and a flag is used to identify whether the indicated beams are the common beams.

65. The method of claim 58, wherein, For the joint common beam indication mode, each beam is used for one time slot unit, the base station selects the beam through the latest received signal including reporting CSI or SRS, each signal received by the base station corresponds to one time slot, and whether the selected beam is the common beam is identified through the correspondence between the time slot and the beam.

66. The method of claim 58, wherein, When the method is executed in the separate common beam indication mode, in the multi-beam operation, the UE applies independent common beams for the DL reception and the UL transmission respectively.

67. The method of claim 66, wherein, The one or more RSs in the M TCIs provide a quasi-co-location (QCL) assumption for the DL reception, the one or more RSs in the N TCIs provide a spatial filter for the UL transmission, and one or more candidate common beams for the DL reception and the UL transmission are respectively contained in the M TCIs and the N TCIs, where M is greater than or equal to 1, and N is greater than or equal to 1.

68. The method of claim 66, wherein, For the DL reception or the UL transmission, when there is only one TCI state, the TCI state only includes one RS to provide a QCL assumption for the DL reception or a spatial filter for the UL transmission, and the beam associated with the RS is the common beam for the DL reception or the UL transmission in the multi-beam operation.

69. The method of claim 66, wherein, When the RS is associated with a plurality of K DL beams and L UL beams contained in the TCI state, the RS is configured to indicate whether K×L beam pairs include the one or more common beams.

70. The method of claim 58, wherein, When the method is executed in the separate common beam indication mode and when there is only one TCI state containing only one RS providing a reference for QCL or spatial filter, the beam associated with the RS is the common beam for the DL reception or the UL transmission.

71. The method of claim 58, wherein, When the method is executed in the separate common beam indication mode and when the base station performs beam sweeping, the UE performs beam measurement, after measuring the beams, the UE sends the UL RS to the base station at a time slot position associated with the measured beam, the base station measures the UL RS and selects the best UL beam to obtain a beam pair.

72. The method of claim 58, wherein, When the method is executed in the separate common beam indication mode and there is only one TCI state, the DL beam associated with the DL RS and the UL beam associated with the UL RS are both configured in the TCI state.

73. The method of claim 58, wherein, When the method is executed in the separate common beam indication mode and there is only one TCI state, and if the indicated DL beam and the indicated UL beam of the indicated beam pair are neither the DL common beam nor the UL common beam, the UE uses the common beam with the lowest beam pair index in the TCI state for the DL reception and the UL transmission in the multi-beam operation.

74. The method of claim 58, wherein, When the method is performed in the separate common beam indication mode and only one TCI state, if the indicated beam pair is not the common beam, but the indicated DL beam or the indicated UL beam in the indicated beam pair is the DL common beam or the UL common beam, the UE uses the common beam with the lowest beam pair index in the TCI state for the DL and UL indication, wherein the lowest beam pair includes the DL or UL common beam related to the indicated common beam pair.

75. The method of claim 58, wherein, When the method is performed in the separate common beam indication mode, when the UE is configured with multiple TCI states, when the common beam does not exist in the indicated TCI state, and if the indicated DL beam and the indicated UL beam of the indicated beam pair are not the DL common beam and the UL common beam, the UE performs the DL reception and the UL transmission using the latest indicated common beam before the scheduling time.

76. The method of claim 58, wherein, When the method is performed in the separate common beam indication mode, when the UE is configured with multiple TCI states, when the common beam does not exist in the indicated TCI state, and if the DL beam or the UL beam of the indicated common beam pair is the common beam, the UE performs the DL reception and the UL transmission using the latest indicated common beam before the scheduling time, wherein the indicated common beam includes the DL or UL common beam related to the indicated common beam pair within the scheduling time.

77. The method of claim 58, wherein, When the method is performed in the hybrid common beam indication mode, the UE uses a first type of common beam and a second type of common beam, wherein the first type of common beam is configured for the DL reception and the UL transmission in the multi-beam operation, and the second type of common beam is configured only for the DL reception or the UL transmission in the multi-beam operation.

78. The method of claim 77, wherein, One or more RSs configured in one or more TCLs provide the first type of common beam and the second type of common beam.

79. The method of claim 77, wherein, When the RS is associated with a plurality of K DL beams, L UL beams, and S beams are applied to the DL reception and the UL transmission included in the TCI state, the RS is configured to indicate whether K times L plus S beam pairs include one or more common beams.

80. The method of claim 77, wherein, The first type of common beam and the second type of common beam have different priorities.

81. The method of claim 80, wherein, The priority of the first type of common beam is higher than that of the second type of common beam.

82. The method of claim 80, wherein, When the common beam in the TCI state does not exist, the first type of common beam and the second type of common beam with higher priority included in the TCI state indicated by the latest scheduling time are considered as the common beam.

83. The method of claim 80, wherein, The base station configures a time window for the UE to distinguish whether the common beam or the common beam pair is valid.

84. The method of claim 80, wherein, If there are not only the first type of common beams in the window time, the UE uses the common beam with the lowest index in the TCI state for the DL reception and the UL transmission in the multi-beam operation; and / or if the window time only contains the second type of common beams, the UE uses the common beam with the lowest beam pair index in the TCI state for the DL reception and the UL transmission in the multi-beam operation.

85. The method of claim 58, wherein, When the method is performed in the mixed common beam indication mode, K times L beam pairs are obtained by combining K DL beams associated with a plurality of DL RS and L UL beams associated with a plurality of UL RS, and there are K times L plus S beams / pairs in total available for the DL reception and the UL transmission.

86. The method of claim 58, wherein, When the method is performed in the mixed common beam indication mode, if there is a selected beam, the index of which is from the first beam to the s-th beam, the UE measures the beam with the RS, only provides the common beam for the DL reception or the UL transmission; and / or if there is a selected beam with an index from the first beam pair to the K times the L-th beam pair, the UE measures the beam with the RS, provides the common beam for the DL reception and the UL transmission.

87. The method of claim 58, wherein, When the method is performed in the default common beam indication mode, when the DL and UL default beam pairs are aligned, the UE uses one or more default common beams as the one or more common beams.

88. The method of claim 87, wherein, The one or more default common beams include the latest common beam with the lowest index contained in one of the scheduling times.

89. A user equipment (UE) for public beam determination, comprising: Comprising: a memory; a transceiver; and a processor coupled to the memory and the transceiver; wherein the processor is configured to perform the method of any one of claims 1 to 44.

90. A base station for public beam determination, the base station comprising: Comprising: a memory; a transceiver; and a processor coupled to the memory and the transceiver; wherein the processor is configured to perform the method of any one of claims 45 to 88.

91. A non-transitory machine-readable storage medium having instructions stored thereon, When the instructions are executed by a computer, the computer performs the method of any one of claims 1 to 88.

92. A chip, comprising: Comprising: a processor configured to invoke and run a computer program stored in a memory to cause a device installed with the chip to perform the method as claimed in any one of claims 1 to 88.

93. A computer-readable storage medium, characterized in that, A computer program is stored, wherein the computer program causes a computer to perform the method as claimed in any one of claims 1 to 88.

94. A computer program product, characterized in that, A computer program is stored, wherein the computer program causes a computer to perform the method as claimed in any one of claims 1 to 88.

95. A computer program characterised in that, The computer program causes a computer to perform the method as claimed in any one of claims 1 to 88. The computer program causes a computer to perform the method as claimed in any one of claims 1 to 88.

Images