Method and apparatus for downlink transmission in physical downlink control channel

Abstract

This application relates to methods and apparatus for downlink transmissions in a physical downlink control channel. The method includes determining at least one transmission configuration indicator (TCI) state for receiving a physical downlink shared channel (PDSCH) or an aperiodic channel state information reference signal (AP CSI-RS), wherein a plurality of TCI states are activated for at least one control resource set (CORESET) in an active bandwidth part (BWP) in a serving cell; and receiving the PDSCH or the AP CSI-RS according to the determined at least one TCI state.

Description

TECHNICAL FIELD

[0001] Embodiments of the present application generally relate to wireless communication technology, and more particularly, to a method and apparatus for enhancing downlink transmission in a physical downlink control channel (e-PDCCH), in which multiple TCI states are activated for a control resource set (CORESET) in an active BWP in a serving cell. BACKGROUND

[0002] In a conventional network, only one transmission configuration indicator (TCI) state is activated for one control resource set (CORESET), and the default TCI state for a physical downlink shared channel (PDSCH) or an aperiodic channel state information reference signal (AP CSI-RS) is determined by the TCI state applied to the CORESET associated with the monitored search space, where the lowest CORESET identification number (e.g., controlResourceSetld) in the latest slot within the active BWP of the serving cell is monitored by the UE.

[0003] In a network with enhanced physical downlink control channel (e-PDCCH) transmission, multiple TCI states are configured for one CORESET, and the default TCI state for a PDSCH or an AP CSI-RS needs to be determined according to higher layer configuration. SUMMARY

[0004] Some embodiments of the present application provide a method of a user equipment (UE). The method includes determining at least one transmission configuration indicator (TCI) state for receiving a physical downlink shared channel (PDSCH) or an aperiodic channel state information reference signal (AP CSI-RS), where multiple TCI states are activated for at least one control resource set (CORESET) in an active bandwidth part (BWP) in a serving cell; and receiving the PDSCH or the AP CSI-RS according to the determined at least one TCI state.

[0005] Some embodiments of the present application provide an apparatus. The apparatus includes a non-transitory computer-readable medium having stored thereon computer- executable instructions; receiving circuitry; transmission circuitry; and a processor coupled to the non-transitory computer-readable medium, the receiving circuitry, and the transmission circuitry, wherein the computer-executable instructions cause the processor to implement the above-mentioned method for wireless communication.

[0006] The details of one or more examples are set forth in the accompanying drawings and the description below. Other features, objects, and advantages will be apparent from the description and drawings, and from the claims. BRIEF DESCRIPTION OF DRAWINGS

[0007] In order to describe the manner in which the advantages and features of the application can be obtained, a description of the application will be rendered by reference to particular embodiments thereof which are illustrated in the appended drawings. These figures are not intended to limit the scope of the application, but are intended to provide specific examples of embodiments of the application.

[0008] Figure 1 A diagram illustrating a wireless communication system in accordance with some embodiments of the application.

[0009] Figure 2A A diagram illustrating message transmission in accordance with some embodiments of the application.

[0010] Figure 2B A diagram illustrating message transmission in accordance with some embodiments of the application.

[0011] Figure 3 A flow diagram of a method for wireless communication in accordance with embodiments of the disclosure.

[0012] Figure 4 A flow diagram of a method for wireless communication in accordance with embodiments of the disclosure.

[0013] Figure 5 A flow diagram of a method for wireless communication in accordance with embodiments of the disclosure.

[0014] Figure 6 A flow diagram of a method for wireless communication in accordance with embodiments of the disclosure.

[0015] Figure 7 A flow diagram of a method for wireless communication in accordance with embodiments of the disclosure.

[0016] Figure 8 A flow diagram of a method for wireless communication in accordance with embodiments of the disclosure.

[0017] Figures 9A to 9E A flow diagram of a method for wireless communication in accordance with embodiments of the disclosure.

[0018] Figures 10A to 10E A flow diagram of a method for wireless communication in accordance with embodiments of the disclosure.

[0019] Figure 11 A block diagram of an exemplary device in accordance with some embodiments of the application. DETAILED DESCRIPTION

[0020] The detailed description set forth above discloses merely exemplary embodiments of the application and is not intended to limit the scope of the application as disclosed in the patent claims. Various modifications can be made to the specific embodiments described and suggestions thereof without departing from the spirit and scope of the application.

[0021] Reference will now be made in detail to some embodiments of this application, examples of which are illustrated in the accompanying drawings. Embodiments of this application can be provided in network architectures employing various service scenarios, such as (but not limited to) 3GPP 3G, Long Term Evolution (LTE), LTE-Advanced (LTE-A), 3GPP 4G, 3GPP 5G NR (New Radio), etc. It should be considered that the terminology used in this application may change with the development of 3GPP and related communication technologies, which should not affect the principles of this application.

[0022] Figure 1 This illustration shows a wireless communication system 100 according to some embodiments of this application. The wireless communication system 100 includes a user equipment (UE) 101, a transmit-receive point (TRP) 102, and a base station (BS) 103. Although in Figure 1 A specific number of UEs 101, TRPs 102 and BSs 103 are depicted, but it should be taken into account that any number of UEs, TRPs, BSs and core networks (CNs) may be included in the wireless communication system 100.

[0023] TRP 102 and BS 103 may be distributed across a geographical area. In some embodiments of this application, BS 103 may be referred to as an access point, access terminal, base station, basic unit, macro cell, Node B, evolved Node B (eNB), gNB, home Node B, relay node, or device, or may be described using other terms used in the art. TRP 102 may be referred to as the transmission point of BS 103.

[0024] UE 101 may include, for example (but not limited to), computing devices such as desktop computers, laptop computers, personal digital assistants (PDAs), tablet computers, smart TVs (e.g., TVs connected to the Internet), set-top boxes, game consoles, security systems (including security cameras), in-vehicle computers, network devices (e.g., routers, switches, and modems), Internet of Things (IoT) devices, or the like.

[0025] According to some embodiments of this application, UE 101 may include, for example (but not limited to), a portable wireless communication device, a smartphone, a cellular phone, a flip phone, a device with a user identity module, a personal computer, a selective call receiver, a wireless sensor, a monitoring device, or any other device capable of transmitting and receiving communication signals on a wireless network.

[0026] In some other embodiments of this application, UE 101 includes, for example (but not limited to), a wearable device, such as a smartwatch, fitness tracker, optical head-mounted display, or the like. Furthermore, UE 101 may be referred to as a user unit, mobile device, mobile station, user, terminal, mobile terminal, wireless terminal, fixed terminal, user station, user terminal, or device, or described using other terms used in the art. UE 101 may communicate with BS 103 via TRP 102.

[0027] The wireless communication system 100 is compatible with any type of network capable of transmitting and receiving wireless communication signals. For example, the wireless communication system 100 is compatible with wireless communication networks, cellular telephone networks, time division multiple access (TDMA) based networks, code division multiple access (CDMA) based networks, orthogonal frequency division multiple access (OFDMA) based networks, LTE networks, 3GPP based networks, 3GPP 5G networks, satellite communication networks, high-altitude platform networks, and / or other communication networks.

[0028] According to some existing protocols (e.g., 3GPP Release 15 and Release 16), for a control resource set (CORESET), only one Transport Configuration Indicator (TCI) state is activated, and the default TCI state for Physical Downlink Shared Channel (PDSCH) or Aperiodic Channel State Information Reference Signal (AP CSI-RS) is determined by the TCI state applied to the CORESET associated with the monitored search space, wherein the lowest CORESET identifier number (e.g., controlResourceSetId as defined in the 3GPP specification) in the most recent slot within the active BWP of the serving cell is monitored by the UE. In scenarios where multiple TCI states are configured for at least one CORESET, it is necessary to determine the default TCI state for PDSCH reception or AP CSI-RS reception.

[0029] Therefore, this disclosure will introduce details of determining the default TCI state for PDSCH reception or AP CSI-RS reception in a network with e-PDCCH, in which multiple TCI states are configured for at least one CORESET. Further details regarding embodiments of this disclosure will be described below.

[0030] Figure 2AThis is a schematic diagram illustrating communication between UE 101 and TRP 102 according to some embodiments of this application. In some network environments, TRP 102 may transmit downlink control information (DCI) 102A to UE 101. Upon receiving DCI 102A, UE 101 may determine at least one TCI state for receiving PDSCH or AP CSI-RS. Then, UE 101 may receive PDSCH or AP CSI-RS based on the determined at least one TCI state.

[0031] Figure 2B This is a schematic diagram illustrating communication between a UE 101 and two TRPs 102 according to some embodiments of this application. In some network environments, TRPs 102 may transmit DCI 102A to UE 101 respectively. After receiving DCI 102A, UE 101 may determine at least one TCI state for receiving PDSCH or AP CSI-RS. Then, UE 101 may receive PDSCH or AP CSI-RS according to the determined at least one TCI state. In some embodiments, DCI 102A transmitted from different TRPs 102 may be a copy of DCI content. In some embodiments, DCI 102A transmitted from different TRPs 102 may be different portions of DCI content.

[0032] More specifically, in these embodiments, multiple TCI states can be activated for at least one core set in the active bandwidth portion (BWP) of the serving cell of TRP 102. In other words, one or more core sets in the active BWP of the serving cell of TRP 102 can be configured with multiple TCI states. It should be noted that Figure 2A and 2B The number of TRP 102 described herein is intended to be illustrative rather than limiting.

[0033] In some embodiments, at least one TCI state for PDSCH reception can be determined. Specifically, in these embodiments, after receiving DCI 102A, UE 101 can calculate the time offset between the reception of DCI 102A and the reception of the PDSCH corresponding to DCI 102A. Then, when:

[0034] (1) When the time offset is less than a threshold (e.g., timeDurationForQCL as defined in the 3GPP specification), and UE 101 is not configured with a parameter that instructs UE 101 to apply two default TCI states based on a single DCI for multi-TRP transmissions (e.g., the higher-level parameter enableTwoDefaultTCIStates as defined in the 3GPP specification); or

[0035] (2) When the time offset is less than the threshold (e.g., timeDurationForQCL), UE 101 is configured with parameters (e.g., higher-level parameter enableTwoDefaultTCIStates), and the TCI code points activated to UE 101 for PDSCH are not mapped to the two TCI states;

[0036] UE101 can determine a specific TCI state with the lowest identifier (e.g., TCI-StateId as defined in the 3GPP specification) from multiple TCI states activated for a specific CORESET, said specific CORESET being associated with a monitored search space, wherein the lowest identifier (e.g., controlResourceSetId) in the most recent slot within the active BWP of the serving cell is monitored by UE101. UE101 can then receive the PDSCH based on a reference signal corresponding to the specific TCI state.

[0037] In other words, UE 101 can determine the quasi-co-address (QCL) parameters of the demodulation reference signal (DM-RS) port of the serving cell's PDSCH with respect to a specific TCI state with the lowest identifier number (e.g., TCI-StateId) associated with the PDCCH quasi-co-address indication for CORESET, wherein the lowest identifier number (e.g., controlResourceSetId) in the nearest time slot where one or more CORESETs within the active BWP of the serving cell are located is monitored by UE 101.

[0038] For example, three cores, designated cores #0 through #2, are configured on the active BWP of the serving cell, and the Media Access Control-Control Element (MAC-CE) activates one or more TCI states for each core. Specifically, TCI state #10 is activated for core #0, TCI states #15 and #20 are activated for core #1, and TCI states #3 and #14 are activated for core #2. DCI #0 transmitted on core #0 schedules PDSCH #0 transmission.

[0039] In this example, UE 101 monitors DCI#1 on CORESET#1 and DCI#2 on CORESET#2 in the most recent time slot. When UE 101 determines that the time offset between the reception of DCI#0 and the reception of PDSCH#0 is less than timeDurationForQCL and UE 101 is not configured with enableTwoDefaultTCIStates, UE 101 determines that the DM-RS port of PDSCH#0 is quasi-co-located with the reference signal with respect to the QCL parameters associated with TCI state #15, which is the TCI state with the lowest TCI-StateId for CORESET#1, where the lowest controlResourceSetId in the most recent time slot is monitored by UE 101.

[0040] In some embodiments, at least one TCI state for PDSCH reception can be determined. Specifically, in these embodiments, after receiving DCI 102A, UE 101 can calculate the time offset between the reception of DCI 102A and the reception of the PDSCH corresponding to DCI 102A. Then, when:

[0041] (1) When the time offset is less than a threshold (e.g., timeDurationForQCL), and UE 101 is not configured with parameters that instruct UE 101 to apply two default TCI states based on a single DCI multi-TRP transmission (e.g., higher-layer parameter enableTwoDefaultTCIStates); or

[0042] (2) When the time offset is less than the threshold (e.g., timeDurationForQCL), UE 101 is configured with parameters (e.g., higher-level parameter enableTwoDefaultTCIStates), and the TCI code points activated to UE 101 for PDSCH are not mapped to the two TCI states;

[0043] UE 101 can determine a specific TCI state for a specific CORESET, which is associated with a monitored search space, wherein the lowest identifier (e.g., controlResourceSetId) within the active BWP of the serving cell in the CORESET configured with a TCI state in the most recent slot is monitored by UE 101. UE 101 can then receive PDSCH based on a reference signal corresponding to the specific TCI state.

[0044] In other words, UE 101 can determine the DM-RS port of the serving cell's PDSCH with respect to the QCL parameters associated with the TCI state of the CORESET and the reference signal quasi-co-address, which is associated with the monitored search space, wherein the lowest identifier (e.g., controlResourceSetId) of the serving cell's active BWP in the CORESET configured with the TCI state of the most recent slot is monitored by UE 101.

[0045] For example, three cores, designated cores #0 through #2, are configured on the active BWP of the serving cell, and MAC-CE activates one or more TCI states for each core. Specifically, TCI state #10 is activated for core #0, TCI states #15 and #20 are activated for core #1, and TCI state #3 is activated for core #2. DCI #0 transmitted on core #0 is scheduled as PDSCH #0 transmission.

[0046] In this example, UE 101 monitors DCI#1 on CORESET#0, DCI#2 on CORESET#1, and DCI#3 on CORESET#2 in the most recent time slot. When UE 101 determines that the time offset between the reception of DCI#0 and the reception of PDSCH#0 is less than timeDurationForQCL, UE 101 is configured with enableTwoDefaultTCIStates and has no TCI code point containing two TCI states. UE 101 determines that the DM-RS port of PDSCH#0 is quasi-co-located with the reference signal in TCI state #10 of CORESET#0, wherein the lowest controlResourceSetId among the CORESETs configured with one TCI state (i.e., CORESET#0 and CORESET#2) is monitored by UE 101 in the most recent time slot.

[0047] In some embodiments, at least one TCI state for AP CSI-RS reception can be determined. Specifically, in these embodiments, DCI 102A can be used to trigger AP CSI-RS transmission. After receiving DCI 102A, UE 101 can calculate the offset between the last symbol of the last PDCCH carrying DCI 102A and the first symbol of the AP CSI-RS resource. The AP CSI-RS resource can be in a non-zero power channel state information reference signal (NZP-CSI-RS) resource set (e.g., NZP-CSI-RS-ResourceSet as defined in the 3GPP specification) configured without tracking reference information parameters (e.g., higher-layer parameters trs-Info as defined in the 3GPP specification). Subsequently, when the offset is less than a threshold (e.g., beamSwitchTiming reported by the UE as defined in the 3GPP specification) and there are no other downlink signals in the same symbol of the AP CSI-RS resource—meaning the PDSCH scheduled with an offset greater than or equal to the threshold (e.g., timeDurationForQCL) has the indicated TCI state—UE 101 can determine a specific TCI state with the lowest identifier (e.g., TCI-StateId) from multiple TCI states active for a specific CORESET associated with the monitored search space, where the lowest identifier (e.g., controlResourceSetId) in the most recent slot within the active BWP of the serving cell is monitored by UE 101. UE 101 can then receive AP CSI-RS based on a reference signal corresponding to the specific TCI state.

[0048] In other words, when receiving AP CSI-RS, UE 101 can apply QCL parameters associated with a specific TCI state with the lowest identifier (e.g., TCI-StateId) activated for CORESET, which is associated with the monitored search space, wherein the lowest identifier (e.g., controlResourceSetId) in the nearest time slot where one or more CORESETs within the active BWP of the serving cell are located is monitored by UE 101.

[0049] For example, three cores, namely cores #0 to core #2, are configured on the active BWP of the serving cell, and MAC-CE activates one or more TCI states for each core. Specifically, TCI states #10 and #54 are activated for core #0, TCI states #15 and #40 are activated for core #1, and TCI states #3 and #30 are activated for core #2. DCI #0 transmitted on core #1 triggers AP CSI-RS resource #0 in NZP-CSI-RS-ResourceSet #0, which is configured not to have the higher-layer parameter trs-Info.

[0050] In this example, UE 101 monitors DCI#1 on CORESET#0 and DCI#2 on CORESET#1 in the most recent time slot. When UE 101 determines that the offset between the last symbol of DCI#0 and the first symbol of CSI-RS#0 is less than beamSwitchTiming, and there are no other downlink signal transmissions indicated by TCI state in the same symbols as the transmission of CSI-RS#0, UE 101 applies the QCL parameters associated with TCI state #10 to receive CSI-RS#0, because TCI state #10 is the TCI state with the lowest TCI-StateId for CORESET#0, where the lowest controlResourceSetId in the most recent time slot is monitored by UE 101.

[0051] In some embodiments, at least one TCI state for AP CSI-RS reception can be determined. Specifically, in these embodiments, DCI 102A can be used to trigger AP CSI-RS transmission. After receiving DCI 102A, UE 101 can calculate the offset between the last symbol of the last PDCCH carrying DCI 102A and the first symbol of the AP CSI-RS resource. The AP CSI-RS resource can be in an NZP-CSI-RS resource set (e.g., NZP-CSI-RS-ResourceSet) configured to not have parameters with tracking reference information (e.g., higher-layer parameter trs-Info). Subsequently, when the offset is less than a threshold (e.g., beamSwitchTiming) and there are no other downlink signals in the same symbol of the AP CSI-RS resource—meaning the PDSCH scheduled with an offset greater than or equal to the threshold (e.g., timeDurationForQCL) has the indicated TCI state—UE 101 can determine a specific TCI state for a specific CORESET associated with the monitored search space, wherein the lowest identifier (e.g., controlResourceSetId) within the active BWP of the serving cell in the CORESET configured with a TCI state in the most recent slot is monitored by UE 101. UE 101 can then receive AP CSI-RS based on a reference signal corresponding to the specific TCI state.

[0052] In other words, when receiving AP CSI-RS, UE 101 can apply QCL parameters associated with a specific TCI state of CORESET, which is associated with the monitored search space, wherein the lowest identifier (e.g., controlResourceSetId) within the active BWP of the serving cell in a CORESET configured with a TCI state is monitored by UE 101 in the most recent time slot.

[0053] For example, three cores, namely cores #0 to core #2, are configured on the active BWP of the serving cell, and MAC-CE activates one or more TCI states for each core. Specifically, TCI states #10 and #54 are activated for core #0, TCI state #15 is activated for core #1, and TCI states #3 and #30 are activated for core #2. DCI #0 transmitted on core #1 triggers AP CSI-RS resource #0 in NZP-CSI-RS-ResourceSet #0, which is configured not to have the higher-layer parameter trs-Info.

[0054] In this example, UE 101 monitors DCI#1 on CORESET#0 and DCI#2 on CORESET#1 in the most recent time slot. When UE 101 determines that the offset between the last symbol of DCI#0 and the first symbol of CSI-RS#0 is less than beamSwitchTiming and there are no other downlink signal transmissions with the indicated TCI state in the same symbol as the transmission of CSI-RS#0, UE 101 applies the QCL parameters associated with TCI state #15 to receive CSI-RS#0, because only CORESET#1 is configured with one TCI state monitored by UE 101 in the most recent time slot (i.e., between CORESET#0 and CORESET#1).

[0055] In some embodiments, at least one TCI state for PDSCH reception can be determined. Specifically, in these embodiments, after receiving DCI 102A, UE 101 can calculate the time offset between the reception of DCI 102A and the reception of the PDSCH corresponding to DCI 102A. Then, when:

[0056] (1) When the time offset is equal to or greater than a threshold (e.g., timeDurationForQCL), the DCI format of DCI 102A does not have a TCI field, and UE 101 is not configured with a parameter (e.g., the higher-level parameter enableTwoDefaultTCIStates) that instructs UE 101 to apply two default TCI states based on a single DCI for multi-TRP transmission; or

[0057] (2) When the time offset is equal to or greater than the threshold (e.g., timeDurationForQCL), the DCI format of DCI 102A does not have a TCI field, UE 101 is configured with parameters (e.g., higher-level parameter enableTwoDefaultTCIStates), and the TCI code point activated to UE 101 for PDSCH is not mapped to two TCI states.

[0058] UE 101 can determine a specific TCI state with the lowest identifier (e.g., TCI-StateId) from multiple TCI states activated for a specific CORESET used to transmit DCI 102A. UE 101 can then receive PDSCH based on a reference signal corresponding to the specific TCI state.

[0059] In some embodiments, at least one TCI state for PDSCH reception can be determined. Specifically, in these embodiments, after receiving DCI 102A, UE 101 can calculate the time offset between the reception of DCI 102A and the reception of the PDSCH corresponding to DCI 102A. Then, when the time offset is equal to or greater than a threshold (e.g., timeDurationForQCL), the format of DCI 102A does not have a TCI field, and UE 101 is configured with parameters (e.g., higher-layer parameter enableTwoDefaultTCIStates) that instruct UE 101 to apply two default TCI states and that at least one TCI code point activated to UE 101 for PDSCH is mapped to the two TCI states. UE 101 can then determine two specific TCI states corresponding to the lowest TCI code point among the TCI code points containing the two TCI states, which are activated to UE 101 for PDSCH. UE 101 can then receive the PDSCH according to a reference signal corresponding to the two specific TCI states.

[0060] In some implementations, the format of DCI 102A without a TCI field can be configured using a parameter with a non-existent TCI (e.g., a higher-layer parameter Tci-PresentInDCI or tci-PresentInDCI-ForFormat1_2 as defined in the 3GPP specification) having a CORESET for transmitting DCI 102A, but at least one parameter with a TCI (e.g., a higher-layer parameter Tci-PresentInDCI or tci-PresentInDCI-ForFormat1_2) is configured for other CORESETs configured in the active BWP of the serving cell. In some implementations, two specific TCI states may contain spatial receiver parameters (e.g., the parameter QCL-TypeD as defined in the 3GPP specification), and UE 101 can simultaneously receive PDSCHs with different TCI states containing spatial receiver parameters.

[0061] In other words, when the higher-layer parameter Tci-PresentInDCI is set to "enabled" or at least one of the CORESET configurations for the active BWP of the serving cell is configured with the higher-layer parameter tci-PresentInDCI-ForFormat1_2, UE101 can receive MAC-CE for activating the TCI state of PDSCH. When PDSCH is scheduled by DCI 102A which does not have a TCI field, the time offset between the reception of DCI 102A and the reception of the corresponding PDSCH is equal to or greater than a threshold (e.g., timeDurationForQCL), and at least one TCI code point activated to UE1 for PDSCH is mapped to two TCI states, UE101 can determine that the DM-RS port of the serving cell's PDSCH is quasi-co-located with respect to the QCL parameters associated with the two specific TCI states, the two specific TCI states corresponding to the lowest TCI code point among the TCI code points containing the two TCI states. Furthermore, if two specific TCI states contain spatial receiver parameters (e.g., parameter QCL-TypeD), then UE101 can simultaneously receive PDSCHs with different TCI states containing spatial receiver parameters.

[0062] In some implementations, the Time Domain Resource Assignment (TDRA) field in DCI 102A may indicate an entry in the PDSCH time domain allocation list (e.g., pdsch-TimeDomainAllocationList as defined in the 3GPP specification) that does not contain the number of repetitions of PDSCH transmissions (e.g., RepNum16 as defined in the 3GPP specification), and the DM-RS port indicated in DCI 102A is within two Code Division Multiplexing (CDM) groups. Therefore, UE 101 can determine that the first TCI state of the two specific TCI states corresponds to one CDM group of the first DM-RS port indicated by DCI 102A, and the second TCI state of the two specific TCI states corresponds to another CDM group.

[0063] In some implementations, the TDRA field in DCI 102A may indicate an entry in the PDSCH time domain allocation list (e.g., pdsch-TimeDomainAllocationList) containing the number of repetitions of PDSCH transmissions (e.g., RepNum16), or UE 101 may be configured for a time-division multiplexing scheme (e.g., TDMSchemeA as defined in the 3GPP specification) by parameters of the repetition scheme (e.g., the higher-layer parameter RepSchemeEnabler defined in the 3GPP specification), and the DM-RS port indicated in DCI 102A is within a CDM group. Therefore, UE 101 can determine that the first TCI state of the two TCI states corresponds to an even-numbered PDSCH transmission timing, and the second TCI state of the two TCI states corresponds to an odd-numbered PDSCH transmission timing.

[0064] In some implementations, UE 101 can be configured to use either a first frequency division multiplexing scheme (e.g., TDMSchemeA) or a second frequency division multiplexing scheme (e.g., TDMSchemeB as defined in the 3GPP specification) via parameters of the repetition scheme (e.g., the higher-layer parameter RepSchemeEnabler). The DM-RS port is indicated within a CDM group, and the precoding granularity can be determined to be wideband. Therefore, UE 101 can determine the first... The Physical Resource Block (PRB) corresponds to the first TCI state of two specific TCI states, and the remaining... The second TCI state corresponds to the two specific TCI states. Where n PRB This is the total number of PRBs allocated to UE101.

[0065] In some implementations, UE 101 can be configured with a first frequency division multiplexing scheme (e.g., TDMSchemeA) or a second frequency division multiplexing scheme (e.g., TDMSchemeB) via parameters of the repetition scheme (e.g., the higher-layer parameter RepSchemeEnabler). The DM-RS port is indicated within a CDM group, and the precoding granularity can be determined as one of the values ​​{2, 4}. Therefore, UE 101 can determine that even-numbered precoding resource block groups (PRGs) within the allocated frequency domain resources correspond to the first TCI state of the two specific TCI states, and odd-numbered PRGs within the allocated frequency domain resources correspond to the second TCI state of the two specific TCI states.

[0066] For example, three CORESETs, CORESET#0 to CORESET#2, are configured on the active BWP of the serving cell, and MAC-CE activates a TCI state containing QCL-TypeD for PDSCH for up to eight TCI code points, as shown in Table 1 below. UE 101 can simultaneously receive PDSCHs with different TCI states containing QCL-TypeD. DCI#0 transmitted on CORESET#0 schedules PDSCH#0 transmission, and DCI#0 has no TCI field. Tci-PresentDCI is set to "disabled", and tci-PresentInDCI-ForFormat1_2 is not configured for CORESET#0. Tci-PresentInDCI is set to "enabled", or tci-PresentInDCI-ForFormat1_2 is configured for other CORESETs, which are CORESET#1 and CORESET#2.

[0067] In this example, when the time offset between the reception of DCI#0 and PDSCH#0 is greater than timeDurationForQCL, the TDRA field in DCI#0 indicates to UE 101 that the pdsch-TimeDomainAllocationList does not contain an entry for RepNumR16, and the DM-RS ports indicated to UE 101 are DM-RS port #0 and DM-RS port #2. DM-RS port #0 is in CDM group #0, and DM-RS port #2 is in CDM group #1. UE 101 determines that TCI state #12 corresponds to the DMRS port in CDM group #0, and TCI state #20 corresponds to the DMRS port in CDM group #1. This is because TCI state #12 and TCI state #20 correspond to the lowest TCI code point 001 among TCI code points 001, 010, and 101, which contain two different TCI states.

[0068]

[0069]

[0070] Table 1: TCI status activated by the active BWP of the serving cell for the PDSCH via MAC-CE

[0071] In some embodiments, at least one TCI state for PDSCH reception is determined. Specifically, in these embodiments, after receiving DCI 102A, UE 101 may calculate the time offset between the reception of DCI 102A and the reception of the PDSCH corresponding to DCI 102A. Then, when the time offset is equal to or greater than a threshold (e.g., timeDurationForQCL), the DCI format of DCI 102A does not have a TCI field, and multiple TCI states are activated for a specific CORESET used to transmit DCI 102A, UE 101 may determine two specific TCI states for that specific CORESET. UE 101 may then receive the PDSCH based on reference signals corresponding to the two specific TCI states. In some embodiments, the two specific TCI states may include spatial receiver parameters (e.g., parameter QCL-TypeD), and UE 101 may be able to simultaneously receive PDSCHs with different TCI states including spatial receiver parameters.

[0072] In other words, during e-PDCCH transmission, when two or more TCI states are activated for a CORESET used for PDCCH transmission, PDSCH scheduled by a DCI without a TCI field can also be transmitted from multiple TRPs, and UE 101 can determine that the DM-RS port of the PDSCH is quasi-co-located with respect to the reference signal with respect to the QCL parameters, regardless of which QCL parameter is applied to the CORESET used for PDCCH transmission of UE 101. When two specific TCI states contain spatial receiver parameters (e.g., parameter QCL-TypeD), UE 101 has the ability to receive simultaneously with different spatial receiver parameters (e.g., parameter QCL-TypeD).

[0073] In some implementations, the TDRA field in DCI 102A may indicate an entry in the PDSCH time domain allocation list (e.g., pdsch-TimeDomainAllocationList) that does not contain the number of repetitions of PDSCH transmissions (e.g., RepNum16), and the DM-RS port indicated in DCI 102A is within two CDM groups. Therefore, UE 101 can determine that the first TCI state of the two specific TCI states corresponds to one CDM group of the first DM-RS port indicated by DCI 102A, and the second TCI state of the two specific TCI states corresponds to another CDM group.

[0074] In some implementations, the TDRA field in DCI 102A may indicate an entry in the PDSCH time domain allocation list (e.g., pdsch-TimeDomainAllocationList) containing the number of repetitions of PDSCH transmissions (e.g., RepNum16), or UE 101 may be configured for a time-division multiplexing scheme (e.g., TDMSchemeA) by parameters of the repetition scheme (e.g., the higher-layer parameter RepSchemeEnable), and the DM-RS port indicated in DCI 102A is within a CDM group. Therefore, UE 101 can determine that the first TCI state of the two TCI states corresponds to an even-numbered PDSCH transmission timing, and the second TCI state of the two TCI states corresponds to an odd-numbered PDSCH transmission timing.

[0075] In some implementations, UE 101 can be configured to use either a first frequency division multiplexing scheme (e.g., TDMSchemeA) or a second frequency division multiplexing scheme (e.g., TDMSchemeB) via parameters of the repetition scheme (e.g., the higher-layer parameter RepSchemeEnabler). The DM-RS port can be indicated within a CDM group, and the precoding granularity can be determined to be wideband. Therefore, UE 101 can determine the first... The Physical Resource Block (PRB) corresponds to the first TCI state of two specific TCI states, and the remaining... The second TCI state corresponds to the two specific TCI states. Where n PRB This is the total number of PRBs allocated to UE 101.

[0076] In some implementations, UE 101 can be configured with a first frequency division multiplexing scheme (e.g., TDMSchemeA) or a second frequency division multiplexing scheme (e.g., TDMSchemeB) via parameters of the repetition scheme (e.g., the higher-layer parameter RepSchemeEnabler). The DM-RS port can be indicated within a CDM group, and the precoding granularity can be determined as one of the values ​​{2, 4}. Therefore, UE 101 can determine that the even-numbered precoding resource block groups (PRGs) within the allocated frequency domain resources correspond to the first TCI state of the two specific TCI states, and the odd-numbered PRGs within the allocated frequency domain resources correspond to the second TCI state of the two specific TCI states.

[0077] For example, three cores (cores #0 to #2) are configured on the active BWP of the serving cell, and MAC-CE activates two TCI states for each core. TCI states #10 and #50 are activated for core #0, TCI states #15 and #20 are activated for core #1, and TCI states #3 and #14 are activated for core #2. DCI #0 transmitted on core #2 is scheduled as PDSCH #0 transmission. Neither Tci-PresentDCI nor tci-PresentInDCI-ForFormat1_2 is configured for all cores #0 to #2.

[0078] In this example, when the time offset between the reception of DCI#0 and the reception of PDSCH#0 is greater than timeDurationForQCL, the TDRA field in DCI#0 indicates to UE 101 an entry in pdsch-TimeDomainAllocationList containing four RepNumR16 entries. UE 101 applies TCI state #3 to the first and third PDSCH transmission times and applies TCI state #14 to the second and fourth PDSCH transmission times. This is because TCI state #3 and TCI state #14 are TCI states used for transmitting the CORESET of DCI#0.

[0079] Figure 3 A flowchart illustrating a method for wireless communication according to some embodiments of this application. (Reference) Figure 3 In some embodiments of this application, method 300 is performed by a UE (e.g., UE 101).

[0080] In some embodiments, operation S301 is performed to allow the UE to determine at least one TCI state for receiving PDSCH or AP CSI-RS. In these embodiments, multiple TCI states are activated for at least one CORESET in the active BWP of the serving cell. Operation S302 is performed to allow the UE to receive PDSCH or AP CSI-RS based on the determined at least one TCI state.

[0081] Figure 4 A flowchart illustrating a method for wireless communication according to some embodiments of this application. (Reference) Figure 4 In some embodiments of this application, method 400 is performed by a UE (e.g., UE 101).

[0082] In some embodiments, operation S401 is performed to have the UE calculate the time offset between the reception of the DCI and the reception of the PDSCH corresponding to the DCI. Then, when:

[0083] (1) When the time offset is less than a threshold (e.g., timeDurationForQCL), and the UE is not configured with parameters indicating that the UE applies two default TCI states based on a single DCI multi-TRP transmission (e.g., the higher-level parameter enableTwoDefaultTCIStates); or

[0084] (2) When the time offset is less than the threshold (e.g., timeDurationForQCL), the UE is configured with parameters (e.g., higher-level parameter enableTwoDefaultTCIStates), and the TCI code points activated to the UE for PDSCH are not mapped to the two TCI states.

[0085] Operation S402 is performed to determine, by the UE, a specific TCI state with the lowest identifier (e.g., TCI-StateId) from multiple TCI states activated for a specific CORESET, said specific CORESET being associated with a monitored search space, wherein the lowest identifier (e.g., controlResourceSetId) in the most recent time slot within the active BWP of the serving cell is monitored by the UE. Operation S403 is performed to receive the PDSCH by the UE based on a reference signal corresponding to the specific TCI state.

[0086] Figure 5 A flowchart illustrating a method for wireless communication according to some embodiments of this application. (Reference) Figure 5 In some embodiments of this application, method 500 is performed by a UE (e.g., UE 101).

[0087] In some embodiments, operation S501 is performed to have the UE calculate the time offset between the reception of the DCI and the reception of the PDSCH corresponding to the DCI. Then, when:

[0088] (1) When the time offset is less than a threshold (e.g., timeDurationForQCL), and the UE is not configured with parameters indicating that the UE applies two default TCI states based on a single DCI multi-TRP transmission (e.g., the higher-level parameter enableTwoDefaultTCIStates); or

[0089] (2) When the time offset is less than the threshold (e.g., timeDurationForQCL), the UE is configured with parameters (e.g., higher-level parameter enableTwoDefaultTCIStates), and the TCI code points activated to the UE for PDSCH are not mapped to the two TCI states.

[0090] Operation S502 is performed to allow the UE to determine a specific TCI state for a specific CORESET, which is associated with a monitored search space, wherein the lowest identifier (e.g., controlResourceSetId) within the active BWP of the serving cell in the CORESET configured with a TCI state in the most recent time slot is monitored by the UE. Operation S503 is performed to allow the UE to receive the PDSCH based on a reference signal corresponding to the specific TCI state.

[0091] Figure 6 A flowchart illustrating a method for wireless communication according to some embodiments of this application. (Reference) Figure 6 In some embodiments of this application, method 600 is performed by a UE (e.g., UE 101).

[0092] In some embodiments, operation S601 is performed to have the UE calculate the offset between the last symbol of the last PDCCH carrying the DCI that triggers the AP CSI-RS transmission and the first symbol of the AP CSI-RS resource. The AP CSI-RS resource may be in an NZP-CSI-RS resource set (e.g., NZP-CSI-RS-ResourceSet) configured to not have parameters with tracking reference information (e.g., higher-layer parameter trs-Info).

[0093] Subsequently, when the offset is less than a threshold (e.g., beamSwitchTiming) and there are no other downlink signals in the same symbol of the AP CSI-RS resource—meaning the PDSCH scheduled with an offset greater than or equal to the threshold (e.g., timeDurationForQCL) has the indicated TCI state—operation S602 is performed to determine, by the UE, a specific TCI state with the lowest identifier (e.g., TCI-StateId) from multiple TCI states activated for a specific CORESET, which is associated with the monitored search space, wherein the lowest identifier (e.g., controlResourceSetId) in the most recent slot within the active BWP of the serving cell is monitored by the UE. Operation S603 is performed to allow the UE to receive AP CSI-RS based on a reference signal corresponding to the specific TCI state.

[0094] Figure 7A flowchart illustrating a method for wireless communication according to some embodiments of this application. (Reference) Figure 7 In some embodiments of this application, method 700 is performed by a UE (e.g., UE 101).

[0095] In some embodiments, operation S701 is performed to have the UE calculate the offset between the last symbol of the last PDCCH carrying the DCI that triggered the AP CSI-RS transmission and the first symbol of the AP CSI-RS resource. The AP CSI-RS resource may be in an NZP-CSI-RS resource set (e.g., NZP-CSI-RS-ResourceSet) configured to not have tracking reference information parameters (e.g., higher-layer parameter trs-Info). Subsequently, when the offset is less than a threshold (e.g., beamSwitchTiming) and there are no other downlink signals in the same symbol of the AP CSI-RS resource, which means that the PDSCH scheduled with another offset greater than or equal to the threshold (e.g., timeDurationForQCL) has the indicated TCI state, operation S702 is performed to have the UE determine the specific TCI state of a specific CORESET, which is associated with the monitored search space, wherein the lowest identifier (e.g., controlResourceSetId) within the active BWP of the serving cell in the CORESET configured with a TCI state in the most recent slot is monitored by the UE. Perform operation S703 to allow the UE to receive AP CSI-RS based on a reference signal corresponding to a specific TCI state.

[0096] Figure 8 A flowchart illustrating a method for wireless communication according to some embodiments of this application. (Reference) Figure 8 In some embodiments of this application, method 800 is performed by a UE (e.g., UE 101).

[0097] In some embodiments, operation S801 is performed to have the UE calculate the time offset between the reception of the DCI and the reception of the PDSCH corresponding to the DCI. Then, when:

[0098] (1) When the time offset is equal to or greater than a threshold (e.g., timeDurationForQCL), the DCI format of the DCI does not have a TCI field, and the UE is not configured with a parameter (e.g., the higher-level parameter enableTwoDefaultTCIStates) that instructs the UE to apply two default TCI states based on a single DCI for multi-TRP transmission; or

[0099] (2) When the time offset is equal to or greater than the threshold (e.g., timeDurationForQCL), the DCI format of the DCI does not have a TCI field, the UE is configured with parameters (e.g., higher-level parameter enableTwoDefaultTCIStates), and the TCI code point activated to the UE for PDSCH is not mapped to two TCI states.

[0100] Operation S802 is performed to determine, by the UE, a specific TCI state with the lowest identifier number (e.g., TCI-StateId) from among multiple TCI states activated for a specific CORESET used to transmit DCI. Operation S803 is performed to allow the UE to receive the PDSCH based on a reference signal corresponding to the specific TCI state.

[0101] Figure 9A A flowchart illustrating a method for wireless communication according to some embodiments of this application. (Reference) Figure 9A In some embodiments of this application, method 900 is performed by a UE (e.g., UE 101).

[0102] In some embodiments, operation S901 is performed to have the UE calculate the time offset between the reception of the DCI and the reception of the PDSCH corresponding to the DCI. Then, when the time offset is equal to or greater than a threshold (e.g., timeDurationForQCL), the DCI format of the DCI does not have a TCI field, and the UE is configured with a parameter (e.g., a higher-level parameter enableTwoDefaultTCIStates) indicating that the UE applies two default TCI states and that at least one TCI code point activated to the UE for the PDSCH is mapped to the two TCI states, operation S902 is performed to have the UE determine two specific TCI states corresponding to the lowest TCI code point among the TCI code points containing the two TCI states, which are activated to the UE for the PDSCH.

[0103] Operation S903 is performed to allow the UE to receive the PDSCH based on reference signals corresponding to two specific TCI states. In some embodiments, the format of the DCI without a TCI field can be configured using parameters of the CORESET used for transmitting the DCI that do not contain a TCI (e.g., higher-layer parameter Tci-PresentInDCI or higher-layer parameter tci-PresentInDCI-ForFormat1_2), but at least one parameter that contains a TCI (e.g., higher-layer parameter Tci-PresentInDCI or higher-layer parameter tci-PresentInDCI-ForFormat1_2) is configured for other CORESETs configured in the active BWP of the serving cell. In some embodiments, the two specific TCI states may include spatial receiver parameters (e.g., parameters of QCL-TypeD), and the UE may be able to simultaneously receive PDSCHs with different TCI states containing spatial receiver parameters.

[0104] In some implementations, the TDRA field in the DCI may indicate an entry in the PDSCH time domain allocation list (e.g., pdsch-TimeDomainAllocationList) that does not contain the number of repetitions (e.g., RepNum16) of the PDSCH transmission, and the DM-RS port indicated in the DCI is within two CDM groups. Therefore, please refer to... Figure 9B In these embodiments, the method may further include operation S903-1. Operation S903-1 is performed to determine by the UE that a first TCI state of the two specific TCI states corresponds to a CDM group of a first DM-RS port indicated by the DCI, and a second TCI state of the two specific TCI states corresponds to another CDM group.

[0105] In some implementations, the TDRA field in the DCI may indicate an entry in the PDSCH time domain allocation list (e.g., pdsch-TimeDomainAllocationList) containing the number of repetitions of PDSCH transmissions (e.g., RepNum16), or the UE may be configured for a time-division multiplexing scheme (e.g., TDMSchemeA) by parameters of the repetition scheme (e.g., the higher-layer parameter RepSchemeEnable), and the DM-RS port indicated in DCI 102A is within a CDM group. Therefore, please refer to... Figure 9C In these embodiments, the method may further include operation S903-2. Operation S903-2 is performed to determine by the UE that the first TCI state of the two TCI states corresponds to an even-numbered PDSCH transmission timing, and the second TCI state of the two TCI states corresponds to an odd-numbered PDSCH transmission timing.

[0106] In some implementations, the UE can be configured to use either a first frequency division multiplexing scheme (e.g., TDMSchemeA) or a second frequency division multiplexing scheme (e.g., TDMSchemeB) via parameters of the repetition scheme (e.g., the higher-layer parameter RepSchemeEnabler). The indicated DM-RS port is within a CDM group, and the precoding granularity can be determined to be wideband. Therefore, please refer to... Figure 9D In these embodiments, the method may further include operation S903-3. Operation S903-3 is performed to determine the first... The first TCI state corresponding to two specific TCI states, and the remaining The second TCI state corresponds to the two specific TCI states. Where n PRB This is the total number of PRBs allocated to the UE.

[0107] In some implementations, the UE can be configured to use either a first frequency division multiplexing scheme (e.g., TDMSchemeA) or a second frequency division multiplexing scheme (e.g., TDMSchemeB) via parameters of the repetition scheme (e.g., the higher-layer parameter RepSchemeEnabler), the indicated DM-RS port being within a CDM group, and the precoding granularity being determined to be one of the values ​​in {2, 4}. Therefore, please refer to... Figure 9E In these embodiments, the method may further include operation S903-4. Operation S903-4 is performed to determine by the UE that the even-numbered PRGs within the allocated frequency domain resources correspond to a first TCI state of two specific TCI states, and the odd-numbered PRGs within the allocated frequency domain resources correspond to a second TCI state of two specific TCI states.

[0108] Figure 10A A flowchart illustrating a method for wireless communication according to some embodiments of this application. (Reference) Figure 10A In some embodiments of this application, method 1000 is performed by a UE (e.g., UE 101).

[0109] In some embodiments, operation S1001 is performed to calculate the time offset between the reception of DCI and the reception of the PDSCH corresponding to DCI by the UE. Then, when the time offset is equal to or greater than a threshold (e.g., timeDurationForQCL), the DCI format of DCI does not have a TCI field, and multiple TCI states are activated for a specific CORESET used to transmit DCI, operation S1002 is performed to determine two specific TCI states for a specific CORESET by the UE.

[0110] Operation S1003 is performed to allow the UE to receive the PDSCH based on reference signals corresponding to two specific TCI states. In some implementations, the two specific TCI states may include spatial receiver parameters (e.g., parameter QCL-TypeD), and the UE may be able to simultaneously receive PDSCHs with different TCI states containing spatial receiver parameters.

[0111] In some implementations, the TDRA field in the DCI may indicate an entry in the PDSCH time domain allocation list (e.g., pdsch-TimeDomainAllocationList) that does not contain the number of repetitions (e.g., RepNum16) of the PDSCH transmission, and the DM-RS port indicated in the DCI is within two CDM groups. Therefore, please refer to... Figure 10B In these embodiments, the method may further include operation S1003-1. Operation S1003-1 is performed to determine by the UE that a first TCI state of two specific TCI states corresponds to a CDM group of a first DM-RS port indicated by the DCI, and a second TCI state of the two specific TCI states corresponds to another CDM group.

[0112] In some implementations, the TDRA field in the DCI may indicate an entry in the PDSCH time domain allocation list (e.g., pdsch-TimeDomainAllocationList) containing the number of repetitions of PDSCH transmissions (e.g., RepNum16), or the UE may be configured for a time-division multiplexing scheme (e.g., TDMSchemeA) by parameters of the repetition scheme (e.g., the higher-layer parameter RepSchemeEnable), and the DM-RS port indicated in DCI 102A is within a CDM group. Therefore, please refer to... Figure 10C In these embodiments, the method may further include operation S1003-2. Operation S1003-2 is performed to determine by the UE that the first TCI state of the two TCI states corresponds to an even-numbered PDSCH transmission timing, and the second TCI state of the two TCI states corresponds to an odd-numbered PDSCH transmission timing.

[0113] In some implementations, the UE can be configured to use either a first frequency division multiplexing scheme (e.g., TDMSchemeA) or a second frequency division multiplexing scheme (e.g., TDMSchemeB) via parameters of the repetition scheme (e.g., the higher-layer parameter RepSchemeEnabler). The DM-RS port can be designated within a CDM group, and the precoding granularity can be determined to be wideband. Therefore, please refer to... Figure 10D In these embodiments, the method may further include operation S1003-3. Operation S1003-3 is performed to determine the first... The first TCI state corresponding to two specific TCI states, and the remaining The second TCI state corresponds to the two specific TCI states. Where n PRB This is the total number of PRBs allocated to the UE.

[0114] In some implementations, the UE can be configured to use either a first frequency division multiplexing scheme (e.g., TDMSchemeA) or a second frequency division multiplexing scheme (e.g., TDMSchemeB) via parameters of the repetition scheme (e.g., the higher-layer parameter RepSchemeEnabler), the indicated DM-RS port being within a CDM group, and the precoding granularity being determined to be one of the values ​​in {2, 4}. Therefore, please refer to... Figure 10E In these embodiments, the method may further include operation S1003-4. Operation S1003-4 is performed to determine by the UE that the even-numbered PRGs within the allocated frequency domain resources correspond to a first TCI state of two specific TCI states, and the odd-numbered PRGs within the allocated frequency domain resources correspond to a second TCI state of two specific TCI states.

[0115] Figure 11 An example block diagram illustrating device 11 according to an embodiment of the present disclosure.

[0116] As in Figure 11 As shown, device 11 may include at least one non-transitory computer-readable medium ( Figure 11 (Not specified in the text), receiving circuit system 1101, transmitting circuit system 1103, and coupled to a non-transitory computer-readable medium (not specified in the text). Figure 11 The device 11 includes a processor 1105 (not specified in the text), a receiving circuit system 1101, and a transmitting circuit system 1103. The device 11 may be a UE.

[0117] Although elements such as processor 1105, transmission circuitry 1103, and receiver circuitry 1101 are described in the singular in this figure, plural forms are considered unless explicitly stated otherwise. In some embodiments of this disclosure, receiver circuitry 1101 and transmission circuitry 1103 are combined into a single device, such as a transceiver. In some embodiments of this disclosure, device 11 may further include input devices, memory, and / or other components.

[0118] In some embodiments of this disclosure, a non-transitory computer-readable medium may store computer-executable instructions thereon to cause a processor to perform the methods described above with respect to a user equipment. For example, when executed, the computer-executable instructions cause the processor 11 to interact with the receiving circuitry 1101 and the transmitting circuitry 1103 to perform actions related to… Figure 2A and 2B The operation of the UE is described in the text.

[0119] Those skilled in the art will understand that the operation of the methods described in connection with the aspects disclosed herein can be directly embodied in hardware, a software module executed by a processor, or a combination of both. The software module may reside in RAM memory, flash memory, ROM memory, EPROM memory, EEPROM memory, registers, hard disk, removable disk, CD-ROM, or any other form of storage medium known in the art. Additionally, in some aspects, the steps of the method may reside as one or more combinations or groups of code and / or instructions on a non-transitory computer-readable medium that can be incorporated into a computer program product.

[0120] Although this disclosure has been described with reference to specific embodiments thereof, many alternatives, modifications, and variations will be apparent to those skilled in the art. For example, in other embodiments, various components of the embodiments may be interchanged, added, or substituted. Furthermore, not all elements of each figure are essential for the operation of the disclosed embodiments. For example, those skilled in the art to which the disclosed embodiments pertain will be able to make and use the teachings of this disclosure by simply employing the elements of the independent claims. Therefore, the embodiments of this disclosure set forth herein are intended to be illustrative and not restrictive. Various changes may be made without departing from the spirit and scope of this disclosure.

[0121] In this document, the term "comprising" or any other variations thereof are intended to cover non-exclusive inclusion, such that a process, method, article, or apparatus that comprises a list of elements may include not only said elements but also other elements not expressly listed or inherent to the process, method, article, or apparatus. Without further constraints, an element beginning with "a" or the like does not exclude the presence of additional equivalent elements in the process, method, article, or apparatus that includes said element. Furthermore, the term "another" is defined as at least a second or more. As used herein, the terms "having" and the like are defined as "comprising".

[0122] In this document, the term "comprising" or any other variations thereof are intended to cover non-exclusive inclusion, such that a process, method, article, or apparatus that comprises a list of elements includes not only said elements but also other elements not expressly listed or inherent to the process, method, article, or apparatus. Without further constraints, elements beginning with "a" or similar do not exclude the presence of additional equivalent elements in the process, method, article, or apparatus that includes said element. Furthermore, the term "another" is defined as at least a second or more. As used herein, the terms "comprising," "having," and similar terms are defined as "comprising."

Claims

1. A method for a user equipment (UE), comprising: Calculate the offset between the last symbol of the last physical downlink control channel (PDCCH) and the first symbol of the aperiodic channel state information reference signal (AP CSI-RS) resource, wherein the last PDCCH carries link control information (DCI) for triggering APCSI-RS transmission, and the AP CSI-RS resource is in a non-zero power channel state information reference signal (NZP-CSI-RS) resource set configured to have no tracking reference information. In response to the offset being less than a threshold, at least one Transmission Configuration Indicator (TCI) state for receiving AP CSI-RS is determined, wherein multiple TCI states are activated for at least one Control Resource Set (CORESET) in the Active Bandwidth Portion (BWP) of the serving cell, and wherein determining the at least one TCI state includes: The TCI state is determined from multiple TCI states, which are activated for a specific CORESET associated with the monitored search space, wherein the lowest identifier number in the nearest slot within the active BWP of the serving cell is monitored by the UE.

2. The method of claim 1, wherein the TCI state has the lowest identifier among the plurality of TCI states.

3. The method of claim 1, wherein no other downlink signals are present in the same symbol of the AP CSI-RS resource, meaning that the PDSCH scheduled with a time offset greater than or equal to another threshold has the indicated TCI state.

4. A method for a user equipment (UE), comprising: Calculate the time offset between the reception of downlink control information (DCI) and the reception of the physical downlink shared channel (PDSCH) corresponding to the DCI; In response to the offset being equal to or greater than a threshold and the DCI format not having a Transport Configuration Indicator (TCI) field, at least one TCI state for receiving the PDSCH is determined, wherein multiple TCI states are activated for at least one Control Resource Set (CORESET) in the Active Bandwidth Portfolio (BWP) of the serving cell, and determining the at least one TCI state includes: Two specific TCI states are determined, corresponding to the lowest TCI code point among two TCI code points, which are activated to the UE for PDSCH.

5. The method of claim 4, wherein the format of the DCI without a TCI field is configured by having a parameter for transmitting a specific CORESET of the DCI with a non-existent TCI, at least one parameter with a present TCI is configured for another CORESET configured in the active BWP of the serving cell, and the UE is configured with a parameter indicating that the UE applies two default TCI states and that at least one TCI code point activated to the UE for the PDSCH is mapped to the two TCI states.

6. The method of claim 4, wherein the Time Domain Resource Assignment (TDRA) field in the DCI indicates that the PDSCH time domain allocation list does not contain an entry for the number of repetitions of PDSCH transmissions and the demodulation reference signal (DM-RS) port indicated in the DCI is within two code division multiplexing (CDM) groups, and the method further comprises: The first TCI state of the two specific TCI states is determined to correspond to a CDM group of the first DM-RS port indicated by the DCI, and the second TCI state of the two specific TCI states corresponds to another CDM group.

7. The method of claim 4, wherein the TDRA field in the DCI indicates an entry in the PDSCH time-domain allocation list containing the number of repetitions of PDSCH transmissions, or the UE is configured as a time-division multiplexing scheme through parameters of the repetition scheme, and the DM-RS port indicated in the DCI is within a CDM group, and the method further comprises: The first TCI state of the two specific TCI states is determined to correspond to an even-numbered PDSCH transmission timing, and the second TCI state of the two specific TCI states corresponds to an odd-numbered PDSCH transmission timing.

8. The method according to claim 4, wherein the UE is configured by parameters to a first frequency division multiplexing scheme or a second frequency division multiplexing scheme, the DM-RS port is indicated to be within a CDM group, and the precoding granularity is determined to be wideband, and the method further comprises: Determine the first The Physical Resource Block (PRB) corresponds to the first TCI state of the two specific TCI states, and the remaining... PRB corresponds to the second TCI state of the two specific TCI states, where This is the total number of PRBs allocated to the UE.

9. The method of claim 4, wherein the UE is configured by parameters to a first frequency division multiplexing scheme or a second frequency division multiplexing scheme, and the DM-RS port is indicated to be within a CDM group and The value is determined to be one of the values ​​in {2, 4}, and the method further includes: The even-numbered precoding resource block group (PRG) within the allocated frequency domain resources corresponds to the first TCI state of the two specific TCI states, and the odd-numbered PRG within the allocated frequency domain resources corresponds to the second TCI state of the two specific TCI states.

10. The method of claim 4, wherein the two specific TCI states contain different spatial receiver parameters, and the UE is capable of simultaneously receiving PDSCHs having different TCI states containing the spatial receiver parameters.

11. A method for a user equipment (UE), comprising: Calculate the offset between the reception of downlink control information (DCI) and the reception of the physical downlink shared channel (PDSCH) corresponding to the DCI; In response to the offset being equal to or greater than a threshold and the DCI format not having a Transport Configuration Indicator (TCI) field, at least one TCI state for receiving the PDSCH is determined, wherein multiple TCI states are activated for at least one Control Resource Set (CORESET) in the Active Bandwidth Portfolio (BWP) of the serving cell, and determining the at least one TCI state includes: Determine two specific TCI states for a specific CORESET used to transmit the PDCCH, wherein the two specific TCI states correspond to one of the following: CDM Group PDSCH transmission timing Physical Resource Block (PRB), or Precoded Resource Block Group (PRG).

12. The method of claim 11, wherein the TDRA field in the DCI indicates an entry in the PDSCH time-domain allocation list that does not contain an entry for the number of repetitions of PDSCH transmissions, and the demodulation reference signal DM-RS port indicated in the DCI is within two CDM groups, and the method further comprises: The first TCI state of the two specific TCI states is determined to correspond to the CDM group of the first DMRS port indicated by the DCI, and the second TCI state of the two specific TCI states corresponds to another CDM group.

13. The method of claim 11, wherein the TDRA field in the DCI indicates an entry in the PDSCH time-domain allocation list containing the number of repetitions of PDSCH transmissions, or the UE is configured as a first time-division multiplexing scheme by parameters of the repetition scheme and the DM-RS port indicated in the DCI is within a CDM group, and the method further comprises: The first TCI state of the two specific TCI states is determined to correspond to an even-numbered PDSCH transmission timing, and the second TCI state of the two specific TCI states corresponds to an odd-numbered PDSCH transmission timing.

14. The method of claim 11, wherein the UE is configured by parameters to a first frequency division multiplexing scheme or a second frequency division scheme, the DM-RS port is indicated within a CDM group, and the precoding granularity is determined to be wideband, and the method further comprises: Determine the first PRB corresponds to the first TCI state of the two specific TCI states, and the remaining PRB corresponds to the second TCI state of the two specific TCI states, where This is the total number of PRBs allocated to the UE.

15. The method of claim 11, wherein the UE is configured by parameters to a first frequency division multiplexing scheme or a second frequency division multiplexing scheme, and the DM-RS port is indicated to be within a CDM group and The value is determined to be one of the values ​​in {2, 4}, and the method further includes: The even-numbered PRGs within the allocated frequency domain resources correspond to the first TCI state of the two specific TCI states, and the odd-numbered PRGs within the allocated frequency domain resources correspond to the second TCI state of the two specific TCI states.

16. A device for wireless communication, comprising: At least one processor; as well as A memory coupled to the at least one processor, the at least one processor being configured such that the device: Perform the method described in any one of claims 1-15.

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