WO2025148272A1

WO2025148272A1 - Methods, devices, and systems for application of transmission configuration indicator

Info

Publication number: WO2025148272A1
Application number: PCT/CN2024/107054
Authority: WO
Inventors: Jing Shi; Shuaihua KOU; Xianghui HAN
Original assignee: ZTE Corp
Current assignee: ZTE Corp
Priority date: 2024-07-23
Filing date: 2024-07-23
Publication date: 2025-07-17
Anticipated expiration: 2027-01-23

Abstract

The present disclosure describes methods, system, and devices for application of transmission configuration indicator (TCI). One method includes interpreting, by a user equipment (UE), a transmission configuration indicator (TCI) state indication in a downlink control information (DCI) based on hybrid automatic repeat request acknowledgement (HARQ-ACK) feedback for multiple physical downlink shared channel (PDSCH) transmissions scheduled by the DCI, wherein: the multiple PDSCH transmissions are transmitted on at least one cell or carrier (CC), and the TCI state indication corresponds to at least one CC list for simultaneous unified TCI update.

Description

METHODS, DEVICES, AND SYSTEMS FOR APPLICATION OF TRANSMISSION CONFIGURATION INDICATOR

TECHNICAL FIELD

The present disclosure is directed generally to wireless communications. Particularly, the present disclosure relates to methods, devices, and systems for application of transmission configuration indicator (TCI) .

BACKGROUND

Wireless communication technologies are moving the world toward an increasingly connected and networked society. High-speed and low-latency wireless communications rely on efficient network resource management and allocation between user equipment and wireless access network nodes (including but not limited to base stations) . A new generation network is expected to provide high speed, low latency and ultra-reliable communication capabilities and fulfill the requirements from different industries and users.

In some wireless communication systems, a downlink control information (DCI) -based beam indication for a user equipment (UE) -dedicated physical downlink control channel (PDCCH) and the associated physical downlink shared channel (PDSCH) may be introduced via a transmission configuration indicator (TCI) field in a DCI, so as to reduce the corresponding beam indication latency and overhead. There are various issues/problems associated with such system. For example, in an acknowledgement (ACK) mechanism for the beam indication with multi-cell/carrier scheduling DCI, there are some issues associated with how to apply the TCI state indication.

The present disclosure describes various embodiments for application of TCI, addressing at least one of the issues/problems discussed in the present disclosure, increasing efficiency of DCI-based beam indication mechanism, increasing performance of wireless communication, and/or improving the field of telecommunication.

SUMMARY

This document relates to methods, systems, and devices for wireless communication, and more specifically, for application of transmission configuration indicator (TCI) . The various embodiments in the present disclosure may be beneficial to enhance efficiency of beam indication mechanism, increase the overall transmission efficiency and speed, and/or boost performance of the wireless communication.

In one embodiment, the present disclosure describes a method for wireless communication, performed by a wireless communication device. The method includes interpreting, by a user equipment (UE) , a transmission configuration indicator (TCI) state indication in a downlink control information (DCI) based on hybrid automatic repeat request acknowledgement (HARQ-ACK) feedback for multiple physical downlink shared channel (PDSCH) transmissions scheduled by the DCI, wherein: the multiple PDSCH transmissions are transmitted on at least one cell or carrier (CC) , and the TCI state indication corresponds to at least one CC list for simultaneous unified TCI update.

In one embodiment, the present disclosure describes another method for wireless communication, performed by a wireless communication node. The method includes interpreting, by a base station, a transmission configuration indicator (TCI) state indication in a downlink control information (DCI) based on hybrid automatic repeat request acknowledgement (HARQ-ACK) feedback for multiple physical downlink shared channel (PDSCH) transmissions scheduled by the DCI, wherein: the multiple PDSCH transmissions are transmitted on at least one cell or carrier (CC) , and the TCI state indication corresponds to at least one CC list for simultaneous unified TCI update.

In some other embodiments, an apparatus for wireless communication may include a memory storing instructions and at least one processing circuitry in communication with the memory. When the at least one processing circuitry executes the instructions, the at least one processing circuitry is configured to carry out the above methods.

In some other embodiments, a device for wireless communication may include a memory storing instructions and at least one processing circuitry in communication with the memory. When the at least one processing circuitry executes the instructions, the at least one processing circuitry is configured to carry out the above methods.

In some other embodiments, a computer-readable medium comprising instructions which, when executed by a computer, cause the computer to carry out the above methods. The computer-readable medium may be a non-transitory computer-readable medium.

The above and other aspects and their implementations are described in greater detail in the drawings, the descriptions, and the claims.

BRIEF DESCRIPTION OF THE DRAWINGS

FIG. 1 shows an example of a wireless communication system include one wireless network node and one or more user equipment.

FIG. 2 shows an example of a network node.

FIG. 3 shows an example of a user equipment.

FIG. 4A shows a flow diagram of a method for wireless communication.

FIG. 4B shows a flow diagram of another method for wireless communication.

FIG. 5A shows a schematic diagram of an embodiment in the present disclosure.

FIG. 5B shows a schematic diagram of another embodiment in the present disclosure.

FIG. 6 shows a schematic diagram of another embodiment in the present disclosure.

FIG. 7 shows a schematic diagram of another embodiment in the present disclosure.

FIG. 8 shows a schematic diagram of another embodiment in the present disclosure.

DETAILED DESCRIPTION

The present disclosure will now be described in detail hereinafter with reference to the accompanied drawings, which form a part of the present disclosure, and which show, by way of illustration, specific examples of embodiments. Please note that the present disclosure may, however, be embodied in a variety of different forms and, therefore, the covered or claimed subject matter is intended to be construed as not being limited to any of the embodiments to be set forth below.

Throughout the specification and claims, terms may have nuanced meanings suggested or implied in context beyond an explicitly stated meaning. Likewise, the phrase “in one embodiment” or “in some embodiments” as used herein does not necessarily refer to the same embodiment and the phrase “in another embodiment” or “in other embodiments” as used herein does not necessarily refer to a different embodiment. The phrase “in one implementation” or “in some implementations” as used herein does not necessarily refer to the same implementation and the phrase “in another implementation” or “in other implementations” as used herein does not necessarily refer to a different implementation. It is intended, for example, that claimed subject matter includes combinations of exemplary embodiments or implementations in whole or in part.

In general, terminology may be understood at least in part from usage in context. For example, terms, such as “and” , “or” , or “and/or, ” as used herein may include a variety of meanings that may depend at least in part upon the context in which such terms are used. Typically, “or” if used to associate a list, such as A, B or C, is intended to mean A, B, and C, here used in the inclusive sense, as well as A, B or C, here used in the exclusive sense. In addition, the term “one or more” or “at least one” as used herein, depending at least in part upon context, may be used to describe any feature, structure, or characteristic in a singular sense or may be used to describe combinations of features, structures or characteristics in a plural sense. Similarly, terms, such as “a” , “an” , or “the” , again, may be understood to convey a singular usage or to convey a plural usage, depending at least in part upon context. In addition, the term “based on” or “determined by” may be understood as not necessarily intended to convey an exclusive set of factors and may, instead, allow for existence of additional factors not necessarily expressly described, again, depending at least in part on context.

The present disclosure describes methods and devices for application of transmission configuration indicator (TCI) .

The 5th Generation mobile communication technology (5G) or further 6th Generation mobile communication technology (6G) face more and more demands. Based on the current development trend, 5G systems are developing supports on features of enhanced mobile broadband (eMBB) , ultra-reliable low-latency communication (URLLC) , and massive machine-type communication (mMTC) . Optionally, Artificial Intelligence/Machine Learning (AI/ML) can be used in 5G, 6G or further wireless communication system to improve the efficiency of communication system.

In some wireless communication systems, a downlink control information (DCI) -based beam indication for a user equipment (UE) -dedicated physical downlink control channel (PDCCH) and the associated physical downlink shared channel (PDSCH) may be introduced via a transmission configuration indicator (TCI) field in a DCI, so as to reduce the corresponding beam indication latency and overhead. In some implementations, to ensure that the NW and the UE are aligned in terms of TCI state for a CC or all CCs in the same CC list, an acknowledgement (ACK) mechanism for the beam indication is supported via the ACK associated with the PDSCH. The present disclosure describes various embodiment on how to apply the TCI state indication, for example, in case above mechanism is also supported by multi-cell/carrier scheduling DCI. In the present disclosure, a CC may refer to a component carrier, a carrier, or a cell.

In some implementations, as downlink (DL) and uplink (UL) beam indication share similar characteristics, a unified TCI (uTCI) based framework for DL and UL beam indication is supported where UL TCI is used to represent UL spatial relation. Depending on whether DL and UL share the same TCI (e.g. in relation to the beam correspondence assumption supported by the UE) , a UE may be configured with either joint DL/UL TCI (where DL and UL share the same TCI state hence a single TCI state update applies to both) or separate DL/UL TCI (which includes the signalling of DL-only, UL-only, and DL+UL TCI state update) . When tci-PresentInDCI is set as 'enabled' or tci-PresentDCI-1-2 is configured for a core resource set (CORESET) , a UE configured with dl-OrJointTCI-StateList with activated TCI-State or ul-TCI-StateList with activated TCI-UL-State receives DCI format 1_1/1_2 providing indicated TCI-State (s) and/or TCI-UL-State (s) for a CC or all CCs in the same CC list configured by simultaneousU-TCI-UpdateList1-r17, simultaneousU-TCI-UpdateList2-r17, simultaneousU-TCI-UpdateList3-r17, simultaneousU-TCI-UpdateList4-r17. When a UE configured with dl-OrJointTCI-StateList would transmit a PUCCH with positive HARQ-ACK or a PUSCH with positive HARQ-ACK corresponding to the DCI carrying the TCI State indication and without DL assignment, or corresponding to the PDSCH scheduled by the DCI carrying the TCI State indication, and if the indicated TCI State (s) is/are different from the previously indicated one(s) , the indicated TCI-State (s) and/or TCI-UL-State (s) should be applied starting from the first slot that is at least beamAppTime symbols after the last symbol of the PUCCH or the PUSCH, and if the UE receives more than one indicated TCI state for a CC/BWP to be applied starting from the first slot that is at least beamAppTime symbols after the last symbol of the PUCCH or the PUSCH, the indicated TCI state carried in the latest DCI in time corresponding to positive HARQ-ACK value is applied. The first slot and the beamAppTime symbols are both determined on the active BWP with the smallest SCS among the BWP (s) from the CCs applying the indicated TCI-State (s) or TCI-UL-State (s) that are active at the end of the PUCCH or the PUSCH carrying the positive HARQ-ACK.

In some implementations, to reduce the control overhead, it may be beneficial to extend from single-cell scheduling to multi-cell PUSCH/PDSCH scheduling by a single DCI. When multi-cell/carrier scheduling by a single DCI format (e.g. DCI format 0_3/1_3, wherein DCI format 0_3 is the UL grant for multi-carrier/cell scheduling, DCI format 1_3 is the DL assignment for multi-carrier/cell scheduling) is introduced for a set of cells, DCI size of DCI format 0_3/1_3 is counted on one cell among the set of cells, BD/CCE of DCI format 0_3/1_3 is counted on one cell among the set of cells, Search space of DCI format 0_3/1_3 is configured on one cell of the set of cells and associated with the search space of the scheduling cell with the same search space ID. For each field in the DCI format 0_3/1_3, the field type could be one of following types: Type-1A field that a single field indicating common information to all the co-scheduled cells, Type-1B field that a single field indicating independent information to each of co-scheduled cells via joint indication; Type-1C field that a single field indicating an information to only one of co-scheduled cells; Type-2 field that separate blocks of a field used for indicating independent information to each of the co-scheduled cells.

In some implementations, TCI field in DCI format 1_3 may be Type-1B field, and entries for each CC may be interpreted based on the target bandwidth parts (BWPs) per cell. When unified TCI framework is configured, DCI format 1_3 may also update unified TCI state, and there may be issues/problems associated with how to interpret TCI field in DCI format 1_3 if unified TCI is configured and the HARQ-ACK feedback for the multiple PDSCHs are not all positive HARQ-ACK.

FIG. 1 shows a wireless communication system 100 including a wireless network node (or a wireless communication node) 118 and one or more user equipment (UE) (or a wireless communication device or terminal) 110. The wireless network node may include a network base station, which may be a nodeB (NB, e.g., a gNB, eNB, or xNB) in a mobile telecommunications context. Each of the UE may wirelessly communicate with the wireless network node via one or more radio channels 115 for downlink/uplink communication. For example, a first UE 110 may wirelessly communicate with a wireless network node 118 via a channel including a plurality of radio channels during a certain period of time. The network base station 118 may send high layer signaling to the UE 110. The high layer signaling may include configuration information for communication between the UE and the base station. In one implementation, the high layer signaling may include a radio resource control (RRC) message.

FIG. 2 shows an example of electronic device 200 to implement a network base station. The example electronic device 200 may include radio transmitting/receiving (Tx/Rx) circuitry 208 to transmit/receive communication with UEs and/or other base stations. The electronic device 200 may also include network interface circuitry 209 to communicate the base station with other base stations and/or a core network, e.g., optical or wireline interconnects, Ethernet, and/or other data transmission mediums/protocols. The electronic device 200 may optionally include an input/output (I/O) interface 206 to communicate with an operator or the like.

The electronic device 200 may also include system circuitry 204. System circuitry 204 may include processor (s) 221 and/or memory 222. Memory 222 may include an operating system 224, instructions 226, and parameters 228. Instructions 226 may be configured for the one or more of the processors 124 to perform the functions of the network node. The parameters 228 may include parameters to support execution of the instructions 226. For example, parameters may include network protocol settings, bandwidth parameters, radio frequency mapping assignments, and/or other parameters.

FIG. 3 shows an example of an electronic device to implement a terminal device 300 (for example, user equipment (UE) ) . The UE 300 may be a mobile device, for example, a smart phone or a mobile communication module disposed in a vehicle. The UE 300 may include communication interfaces 302, a system circuitry 304, an input/output interfaces (I/O) 306, a display circuitry 308, and a storage 309. The display circuitry may include a user interface 310. The system circuitry 304 may include any combination of hardware, software, firmware, or other logic/circuitry. The system circuitry 304 may be implemented, for example, with one or more systems on a chip (SoC) , application specific integrated circuits (ASIC) , discrete analog and digital circuits, and other circuitry. The system circuitry 304 may be a part of the implementation of any desired functionality in the UE 300. In that regard, the system circuitry 304 may include logic that facilitates, as examples, decoding and playing music and video, e.g., MP3, MP4, MPEG, AVI, FLAC, AC3, or WAV decoding and playback; running applications; accepting user inputs; saving and retrieving application data; establishing, maintaining, and terminating cellular phone calls or data connections for, as one example, internet connectivity; establishing, maintaining, and terminating wireless network connections, Bluetooth connections, or other connections; and displaying relevant information on the user interface 310. The user interface 310 and the inputs/output (I/O) interfaces 306 may include a graphical user interface, touch sensitive display, haptic feedback or other haptic output, voice or facial recognition inputs, buttons, switches, speakers and other user interface elements. Additional examples of the I/O interfaces 306 may include microphones, video and still image cameras, temperature sensors, vibration sensors, rotation and orientation sensors, headset and microphone input /output jacks, Universal Serial Bus (USB) connectors, memory card slots, radiation sensors (e.g., IR sensors) , and other types of inputs.

Referring to FIG. 3, the communication interfaces 302 may include a Radio Frequency (RF) transmit (Tx) and receive (Rx) circuitry 316 which handles transmission and reception of signals through one or more antennas 314. The communication interface 302 may include one or more transceivers. The transceivers may be wireless transceivers that include modulation /demodulation circuitry, digital to analog converters (DACs) , shaping tables, analog to digital converters (ADCs) , filters, waveform shapers, filters, pre-amplifiers, power amplifiers and/or other logic for transmitting and receiving through one or more antennas, or (for some devices) through a physical (e.g., wireline) medium. The transmitted and received signals may adhere to any of a diverse array of formats, protocols, modulations (e.g., QPSK, 16-QAM, 64-QAM, or 256-QAM) , frequency channels, bit rates, and encodings. As one specific example, the communication interfaces 302 may include transceivers that support transmission and reception under the 2G, 3G, BT, WiFi, Universal Mobile Telecommunications System (UMTS) , High Speed Packet Access (HSPA) +, 4G /Long Term Evolution (LTE) , 5G standards, 6G, and/or any further generation standards. The techniques described below, however, are applicable to other wireless communications technologies whether arising from the 3rd Generation Partnership Project (3GPP) , GSM Association, 3GPP2, IEEE, or other partnerships or standards bodies.

Referring to FIG. 3, the system circuitry 304 may include one or more processors 321 and memories 322. The memory 322 stores, for example, an operating system 324, instructions 326, and parameters 328. The processor 321 is configured to execute the instructions 326 to carry out desired functionality for the UE 300. The parameters 328 may provide and specify configuration and operating options for the instructions 326. The memory 322 may also store any BT, WiFi, 3G, 4G, 5G, 6G, or other data that the UE 300 may send, or has received, through the communication interfaces 302. In various implementations, a system power for the UE 300 may be supplied by a power storage device, such as a battery or a transformer.

The present disclosure describes various embodiment for application of transmission configuration indicator (TCI) , which may be implemented, partly or totally, by the network base station and/or the user equipment described above in FIGs. 2-3. The various embodiments in the present disclosure may enable efficient wireless transmission in the telecommunication system, which may increase the resource utilization efficiency and/or boost wireless communication performance.

Referring to FIG. 4A, the present disclosure describes various embodiments of a method 400 for wireless communication. The method 400 may be performed by a wireless communication device (e.g., a user equipment) . The method 400 may include step 410, interpreting, by a user equipment (UE) , a transmission configuration indicator (TCI) state indication in a downlink control information (DCI) based on hybrid automatic repeat request acknowledgement (HARQ-ACK) feedback for multiple physical downlink shared channel (PDSCH) transmissions scheduled by the DCI, wherein: the multiple PDSCH transmissions are transmitted on at least one cell or carrier (CC) , and/or the TCI state indication corresponds to at least one CC list for simultaneous unified TCI update.

Referring to FIG. 4B, the present disclosure describes various embodiments of a method 450 for wireless communication. The method 450 may be performed by a wireless communication node (e.g., a base station or a radio access network (RAN) ) . The method 450 may include step 460, interpreting, by a base station, a transmission configuration indicator (TCI) state indication in a downlink control information (DCI) based on hybrid automatic repeat request acknowledgement (HARQ-ACK) feedback for multiple physical downlink shared channel (PDSCH) transmissions scheduled by the DCI, wherein: the multiple PDSCH transmissions are transmitted on at least one cell or carrier (CC) , and/or the TCI state indication corresponds to at least one CC list for simultaneous unified TCI update.

In various embodiments in the present disclosure, a CC may refer to anyone of a carrier, a cell, or a carrier component.

In some implementations, optionally or additional to any one or any combinations of one or more implementations or embodiments in the present disclosure, the multiple PDSCH transmissions are transmitted on at least one CC in a CC set configured for multi-CC scheduling; and/or the multiple PDSCH transmissions are transmitted on one CC .

In some implementations, optionally or additional to any one or any combinations of one or more implementations or embodiments in the present disclosure, the multiple PDSCH transmissions are transmitted on at least one CC in the CC set; and/or CCs in the CC set are configured in a CC list, or same as all CCs in a CC list.

In some implementations, optionally or additional to any one or any combinations of one or more implementations or embodiments in the present disclosure, in response to the HARQ-ACK feedback for the multiple PDSCH transmissions comprising at least one positive HARQ-ACK (ACK) : the TCI state indication is applied to all CCs in the CC set or CC list; the TCI state indication is applied to all CCs in the CC set or CC list, except a CC in which negative HARQ-ACK (NACK) is received; and/or the TCI state indication is only applied to the CC in the CC set or CC list in which ACK is received.

In various embodiments, ACK may refer to positive HARQ-ACK, and NACK may refer to negative HARQ-ACK.

In some implementations, optionally or additional to any one or any combinations of one or more implementations or embodiments in the present disclosure, in response to the HARQ-ACK feedback for the multiple PDSCH transmissions comprising all ACK, the TCI state indication is applied to all CCs in the CC set or CC list.

In some implementations, optionally or additional to any one or any combinations of one or more implementations or embodiments in the present disclosure, in response to the HARQ-ACK feedback for the multiple PDSCH transmissions comprising at least one ACK for a pre-defined CC, the TCI state indication is applied to all CCs in the CC set or CC list, wherein the pre-defined CC comprises one of the following: a reference CC, a CC with a lowest index among the scheduled CCs, a CC with a highest index among the scheduled CCs, or a pre-configured CC.

In some implementations, optionally or additional to any one or any combinations of one or more implementations or embodiments in the present disclosure, the multiple PDSCH transmissions are transmitted on at least one CC in the CC set; and/or CCs in the CC set are configured in more than one CC lists.

In some implementations, optionally or additional to any one or any combinations of one or more implementations or embodiments in the present disclosure, in response to the HARQ-ACK feedback for the multiple PDSCH transmissions comprising at least one ACK: the TCI state indication is applied to all CCs in the CC set; the TCI state indication is applied to all CCs in the CC set, except a CC in which NACK is received; the TCI state indication is only applied to CC in the CC set in which ACK is received; the TCI state indication is applied to all CCs in the more than one CC lists; the TCI state indication is applied to all CCs in one or more CC list in the more than one CC lists in which ACK is received; the TCI state indication is applied to all CCs in either the CC set or one or more CC list in the more than one CC lists in which ACK is received, except a CC in which NACK is received; the TCI state indication is applied to all CCs in both the CC set and one or more CC list in the more than one CC lists in which ACK is received; and/or the TCI state indication is applied to all CCs in both the CC set and one or more CC list in the more than one CC lists in which ACK is received, except a CC in which NACK is received.

In some implementations, optionally or additional to any one or any combinations of one or more implementations or embodiments in the present disclosure, in response to the HARQ-ACK feedback for the multiple PDSCH transmissions comprising all ACK, the TCI state indication is applied to all CCs in the CC set.

In some implementations, optionally or additional to any one or any combinations of one or more implementations or embodiments in the present disclosure, in response to the HARQ-ACK feedback for the multiple PDSCH transmissions comprising at least one positive ACK for a pre-defined CC, the TCI state indication is applied to all CCs in the CC set, wherein the pre-defined CC comprises one of the following: a reference CC, a CC with a lowest index among the scheduled CCs, a CC with a highest index among the scheduled CCs, and/or a pre-configured CC.

In some implementations, optionally or additional to any one or any combinations of one or more implementations or embodiments in the present disclosure, the multiple PDSCH transmissions are transmitted on one CC; and/or the CC is configured in a CC list.

In some implementations, optionally or additional to any one or any combinations of one or more implementations or embodiments in the present disclosure, in response to the HARQ-ACK feedback for the multiple PDSCH transmissions comprising at least one ACK: the TCI state indication is applied to all CCs in the CC list; or the TCI state indication is applied to all CCs in the CC list, except a CC in which NACK is received.

In some implementations, optionally or additional to any one or any combinations of one or more implementations or embodiments in the present disclosure, in response to the HARQ-ACK feedback for the multiple PDSCH transmissions comprising all ACK, the TCI state indication is applied to all CCs in the CC list.

In some implementations, optionally or additional to any one or any combinations of one or more implementations or embodiments in the present disclosure, in response to the HARQ-ACK feedback for the multiple PDSCH transmissions comprising at least one ACK for a reference PDSCH, the TCI state indication is applied to all CCs in the CC list, wherein the reference PDSCH comprises one of the following: a PDSCH with a lowest index among the scheduled multiple PDSCH transmissions, a PDSCH with a highest index among the scheduled multiple PDSCH transmissions, or a pre-configured PDSCH.

In some implementations, optionally or additional to any one or any combinations of one or more implementations or embodiments in the present disclosure, in response to a number of ACKs in the HARQ-ACK feedback for the multiple PDSCH transmissions satisfying a per-defined condition, the TCI state indication is applied to all CCs in the CC list, wherein the pre-defined condition comprises at least one of the following: being larger than a number of NACKs in the HARQ-ACK feedback for the multiple PDSCH transmissions, being no smaller than a number of NACKs in the HARQ-ACK feedback for the multiple PDSCH transmissions, being larger than 50%, being no smaller than 50%, being larger than a threshold, and/or being no smaller than a threshold.

The present disclosure describes various exemplary embodiments for application of TCI in a wireless communication system, and the exemplary embodiments merely serve as examples and do not pose limitations. Any steps and/or operations in one same embodiment/implementation or more than one different embodiments/implementation in the present disclosure may be combined or arranged in any amount or order, as desired. Two or more of the steps and/or operations may be performed in parallel. Embodiments and implementations in the disclosure may be used separately or combined in any order. Further, each of the methods (or embodiments) may be implemented by processing circuitry (e.g., one or more processors or one or more integrated circuits) . In various embodiments as described below, a “cell” may be referred to as a “CC” (i.e., a carrier or a cell) .

Embodiment Set I

The present disclosure describes various embodiments for application of TCI. In some implementations, for DCI format 1_1/1_2 used for single carrier/cell scheduling, unified TCI update may be supported for carrier aggregation (CA) , i.e., unified TCI update may be indicated by single DCI for multiple CCs. Based on the unified TCI update for CA with DCI format 1_1/1_2, it has been already supported that indicated TCI state is applied not only for scheduled cell but also for non-scheduled cell. In some implementations, the indicated TCI-State (s) and/or TCI-UL-State (s) (unified TCI update) may be applied for when ACK is feedback for the PDSCH after a time offset.

In some implementations, for DCI format 1_3 used for multi-carrier/cell scheduling, when tci-PresentInDCI is set as 'enabled' or tci-PresentDCI-1-2 is configured for the CORESET, a UE configured with dl-OrJointTCI-StateList with activated TCI-State or ul-TCI-StateList with activated TCI-UL-State receives DCI format 1_1/1_2/1_3 providing indicated TCI-State (s) and/or TCI-UL-State (s) for a CC or all CCs in the same CC list configured by simultaneousU-TCI-UpdateList1-r17, simultaneousU-TCI-UpdateList2-r17, simultaneousU-TCI-UpdateList3-r17, simultaneousU-TCI-UpdateList4-r17. The DCI format 1_3 provides indicated TCI state (s) and/or TCI-UL-State (s) for the CC (s) in a scheduledCellListDCI-1-3 if the UE is scheduled by the DCI format 1_3 to receive PDSCH at least on one serving cell in the scheduledCellListDCI-1-3.

For one scenario (Scenario#1) , the cells in one cell set for multiple cells scheduling are configured in a CC list, or same as the CCs in a CC list for unified TCI updates. For example, cell 0, 1 are configured as a cell set for multi-cell scheduling, cell 0, 1, 2, 3 are also configured as a CC list for uTCI update. For example, cell 0, 1, 2, 3 are configured as a cell set for multi-cell scheduling, cell 0, 1, 2, 3 are also configured as a CC list for uTCI update. As shown in FIG. 5A, cell 0, 1, 2, 3 are configured as a cell set#1 for DCI format 1_3 (scheduledCellListDCI-1-3) , and cell 0, 1, 2, 3 are also configured as a CC list for uTCI update (simultaneousU-TCI-UpdateList1-r17) .

For one case (Case 1) , only one PDSCH is scheduled by DCI format 1_3 at a time, the indicated TCI-State (s) and/or TCI-UL-State (s) may be applied for when ACK is feedback for the PDSCH after a time offset (e.g., applied starting from the first slot that is at least N symbols after the last symbol of the PUCCH or the PUSCH, wherein N could be configured/reported by RRC signalling, e.g., beamAppTime or other parameter) .

For another case (Case 2) , multiple PDSCHs are scheduled by DCI format 1_3 at a time, the HARQ-ACK feedback for the scheduled PDSCHs may comprise all positive HARQ-ACK (ACK) , all negative HARQ-ACK (NACK) , or mixed ACK and NACK. In some implementations, it is not clear whether/how to apply the indicated TCI-State (s) and/or TCI-UL-State (s) for the CC (s) in a scheduledCellListDCI-1-3. In some implementations, based on current mechanism, only one PDSCH on a CC is scheduled by a single cell/carrier scheduling DCI (SC-DCI) , there are no multiple PDSCH multi-cell/carrier scheduling DCI (MC-DCI) . For example, in case two PDSCHs on two cells are scheduled by DCI format 1_3, with ACK feedback for one PDSCH and NACK for another PDSCH, it is not clear how to apply the TCI-State (s) and/or TCI-UL-State (s) provided by a TCI codepoint for the CC (s) in a scheduledCellListDCI-1-3.

The present disclosure describes various embodiments for applying TCI state indication in DCI (e.g., in DCI format 1_3) by one of following methods (options) , when unified TCI is configured and the HARQ-ACK feedback for the multiple PDSCHs are not all positive HARQ-ACK.

For one option (Option 1) , one method includes applying TCI state indication in DCI (e.g., in DCI format 1_3) to all CCs in the cell set or CC list if at least one ACK is received.

For another option (Option 2) , one method includes applying TCI state indication in DCI (e.g., in DCI format 1_3) to all CCs in the cell set or CC list except the CC with NACK received.

For another option (Option 3) , one method includes applying TCI state indication in DCI (e.g., in DCI format 1_3) to the CCs in the cell set or CC list only with ACK received.

For another option (Option 4) , one method includes applying TCI state indication in DCI (e.g., in DCI format 1_3) to the CCs in the cell set or CC list if ACK received for all scheduled PDSCHs/CCs.

For another option (Option 5) , one method includes applying TCI state indication in DCI (e.g., in DCI format 1_3) to Apply to all CCs in the cell set if one ACK is received for a cell/carrier which is the reference cell/carrier, or the cell/carrier with lowest/highest index.

For another option (Option 12) , the exemplary method may include applying TCI state indication in DCI (e.g., in DCI format 1_3) to the CCs in the CC list if the number of PDSCHs/CCs with ACK feedback is larger or no less than the number of PDSCHs/CCs with NACK feedback, or is larger or no less than a threshold.

For one non-limiting example (example#1) , referring to FIG. 5B, Cell 0, 1, 2, 3 are configured as a cell set for DCI format 1_3 (scheduledCellListDCI-1-3) , and cell 0, 1, 2, 3 are also configured as a CC list for uTCI update (simultaneousU-TCI-UpdateList1-r17) . Multiple PDSCHs (e.g. cell #0, 1, 2) are scheduled by DCI format 1_3 at a time; the HARQ-ACK feedback for the scheduled PDSCHs may comprise all positive HARQ-ACK, all negative HARQ-ACK, or mixed ACK and NACK. This particularly non-limiting example may include ACK for cell#0, NACK for cell#1, NACK for cell#2. TCI state indication in DCI (e.g., in DCI format 1_3) may be applied by one of following options when unified TCI is configured and the HARQ-ACK feedback for the multiple PDSCHs are not all positive HARQ-ACK.

For one option (Option 1) , the exemplary method may include applying TCI state indication in DCI (e.g., in DCI format 1_3) to all CCs in the cell set or CC list if at least one ACK is received. With respect to example#1, the exemplary method may apply to cell #0, 1, 2, 3. The legacy mechanism based on SC-DCI allows to indicate the TCI update of multiple CCs based on SC-DCI scheduling for one PDSCH, one ACK feedback for the PDSCH can be used to confirm the TCI update. When multiple PDSCHs scheduled by DCI format 1_3 and at least one positive HARQ-ACK for one of the multiple PDSCHs is feedback, TCI states for all CCs in the CC list are applied. E.g. TCI state (s) and/or TCI-UL-State (s) for the CC (s) in a scheduledCellListDCI-1-3 are applied if at least one positive HARQ-ACK is feedback for the PDSCH at least on one serving cell in the scheduledCellListDCI-1-3.

For another option (Option 2) , the exemplary method may include applying TCI state indication in DCI (e.g., in DCI format 1_3) to all CCs in the cell set or CC list except the CC with NACK received. With respect to example#1, the exemplary method may apply to cell #0, 3. If a NACK is feedback for a CC, it means that the CC may have poor channel quality or other issues. In this case, the TCI of the CC should not be updated, or the TCI indication is not updated if the NACK is feedback, in accordance with the current SC-DCI scheduling with NACK feedback. E.g. TCI state (s) and/or TCI-UL-State (s) for the CC (s) in a scheduledCellListDCI-1-3 are applied except the CC with negative HARQ-ACK for the scheduled PDSCH on the CC.

For another option (Option 3) , the exemplary method may include applying TCI state indication in DCI (e.g., in DCI format 1_3) to the CCs in the cell set or CC list only with ACK received. With respect to example#1, the exemplary method may apply to cell #0. Since the feedback for the scheduled multiple PDSCHs on multiple cells comprises ACK and NACK, that is, it is uncertain whether to apply the TCI states for the non-scheduled cell. It is better not to apply for the sake of safety, while it is applied in the Option 1 and Option 2. E.g. TCI state (s) and/or TCI-UL-State (s) for the CC (s) in a scheduledCellListDCI-1-3 are applied except the CC with negative HARQ-ACK for the scheduled PDSCH on the CC and the CC without scheduled PDSCH.

For another option (Option 4) , the exemplary method may include applying TCI state indication in DCI (e.g., in DCI format 1_3) to the CCs in the cell set or CC list if ACK received for all scheduled PDSCHs/CCs. With respect to example#1, the exemplary method may not apply to any cell. That is, do not apply to the CCs in the cell set if at least one NACK is received. E.g. TCI state (s) and/or TCI-UL-State (s) for the CC (s) in a scheduledCellListDCI-1-3 are applied if positive HARQ-ACK is feedback for all the PDSCH (s) on at least one serving cell in the scheduledCellListDCI-1-3.

For another option (Option 5) , the exemplary method may include applying TCI state indication in DCI (e.g., in DCI format 1_3) to all CCs in the cell set or CC list if one ACK is received for a cell which is the reference cell, or the cell with lowest/highest index of the scheduled cells or the configured cells in the cell set. In some implementations, the reference cell is predefined, or is configured by RRC signalling. In some implementations, the reference cell may be one cell in the cell set, and the DCI size and PDCCH monitoring of the multi-cell scheduling DCI is counted on the reference cell. In some implementations, some legacy mechanism based on SC-DCI may allow to indicate the TCI update of multiple CCs based on SC-DCI scheduling for one PDSCH; and one ACK feedback for the PDSCH may be used to confirm the TCI update, therefore one cell/CC of the multiple cells/CCs scheduled by MC-DCI may be selected as the basis for determination whether to apply the TCI updates based on the HARQ-ACK feedback of the cell/CC. It can also be regarded as a special case in Option 1. With respect to example#1, the method may apply to cell #0, 1, 2, 3 when referring to the lowest cell index (cell#0) ; or do not apply for any cell when referring to reference cell#1. E.g. TCI state (s) and/or TCI-UL-State (s) for the CC (s) in a scheduledCellListDCI-1-3 are applied if the UE is scheduled by the DCI format 1_3 to receive PDSCH at least on one serving cell in the scheduledCellListDCI-1-3, and one positive HARQ-ACK is feedback for the PDSCH on a cell which is a reference cell or cell with the smallest serving cell index among the scheduled cells indicated by a scheduled cells indicator field or a frequency domain resource assignment field.

For another option (Option 12) , the exemplary method may include applying TCI state indication in DCI (e.g., in DCI format 1_3) to the CCs in the CC list if the number of PDSCHs/CCs with ACK feedback is larger or no less than the number of PDSCHs/CCs with NACK feedback, or is larger or no less than a threshold. For example, the threshold may be 50%or other value. With respect to example#1, the exemplary method may not apply to any cell because there the number of PDSCHs with ACK feedback is less than the number of PDSCHs with NACK feedback. E.g. TCI state (s) and/or TCI-UL-State (s) for the CC (s) in a CC list are applied if multiple PDSCHs on multi-cell are scheduled on more than one CC and the number of PDSCHs with ACK feedback is larger or no less than the number of PDSCHs with NACK feedback.

Various embodiments described in the present disclosure may have the following benefits: when unified TCI framework is configured, DCI format 1_3 can also update unified TCI state, TCI state indication in DCI format 1_3 is determined by feedback of one, partial or all cell (s) with ACK (s) if unified TCI is configured and the HARQ-ACK feedback for the multiple PDSCHs are not all positive HARQ-ACK. It is benefit to keep the same understanding between a base station (e.g., gNB) and a UE on the application of TCI updates in case multiple PDSCHs on multiple cells are scheduled by a single DCI.

Embodiment Set II

The present disclosure describes various embodiments for application of TCI. For another scenario (Scenario#2) , the cells in one cell set for multiple cells scheduling are configured in different CC lists for unified TCI updates. That is, the cells in one cell set for multiple cells scheduling may be configured in more than one CC list for unified TCI updates. As shown in FIG. 6, cell 0, 1, 2, 3 are configured as a cell set for DCI format 1_3 (scheduledCellListDCI-1-3) , cell 0, 1, 4, 5 are also configured as a CC list for uTCI update (simultaneousU-TCI-UpdateList1-r17) ; and cell 2, 3, 6, 7 are also configured as another CC list for uTCI update (simultaneousU-TCI-UpdateList2-r17) .

For one option (Option 1) , one method includes applying TCI state indication in DCI (e.g., in DCI format 1_3) to all CCs in the cell set if at least one ACK is received.

For another option (Option 2) , one method includes applying TCI state indication in DCI (e.g., in DCI format 1_3) to all CCs in the cell set except the CC with NACK received.

For another option (Option 3) , one method includes applying TCI state indication in DCI (e.g., in DCI format 1_3) to the CCs in the cell set only with ACK received.

For another option (Option 4) , one method includes applying TCI state indication in DCI (e.g., in DCI format 1_3) to the CCs in the cell set or all CCs in the more than one CC lists if ACK received for all scheduled PDSCHs/CCs.

For another option (Option 5) , one method includes applying TCI state indication in DCI (e.g., in DCI format 1_3) to all CCs in the cell set or all CCs in the more than one CC lists if one ACK is received for a cell which is the reference cell, or the cell with lowest/highest index.

For another option (Option 12) , the exemplary method may include applying TCI state indication in DCI (e.g., in DCI format 1_3) to the CCs in the CC list (s) if the number of PDSCHs/CCs with ACK feedback is larger or no less than the number of PDSCHs/CCs with NACK feedback, or is larger or no less than a threshold.

For another option (Option 6) , one method includes applying TCI state indication in DCI (e.g., in DCI format 1_3) to all CCs in the CC lists if at least one CC list comprising the at least one CC in the cell set if at least one ACK is received.

For another option (Option 7) , one method includes applying TCI state indication in DCI (e.g., in DCI format 1_3) to all CCs in a CC list comprising the at least one CC in the cell set if at least one ACK is received, or the TCI state indication in DCI (e.g., in DCI format 1_3) is applied to all CCs in a CC list if at least one ACK is received for a CC in the CC list.

For another option (Option 8) , one method includes applying TCI state indication in DCI (e.g., in DCI format 1_3) to all CCs in the cell set and CC lists comprising the at least one CC in the cell set if ACK is received for the CC, and except the CC with NACK received.

For another option (Option 9) , one method includes applying TCI state indication in DCI (e.g., in DCI format 1_3) to the CCs in a CC list and also in the cell set comprising the at least one CC in the cell set if ACK is received for the CC.

For one non-limiting example (example#3) , referring to FIG. 6, multiple PDSCHs (e.g. cell#1, 2) are scheduled by DCI format 1_3 at a time, while each scheduled cell belongs to different CC list (cell list1, cell list2) ; the HARQ-ACK feedback for the scheduled PDSCHs may comprise all positive HARQ-ACK, all negative HARQ-ACK, or mixed ACK and NACK, wherein for this particular example#3, ACK for cell#1 and NACK for cell#2. In some implementations, it is not clear whether/how to apply the indicated TCI-State (s) and/or TCI-UL-State (s) for the CC (s) in the cell set#1 and/or the CC list1, 2. In some implementations, based on current mechanism, only one PDSCH on a CC is scheduled by a single cell/carrier scheduling DCI (SC-DCI) , there are no multiple PDSCH multi-cell/carrier scheduling DCI (MC-DCI) . For example, in case two PDSCHs on two cells are scheduled by DCI format 1_3, with ACK feedback for one PDSCH and NACK for another PDSCH, it is not clear how to apply the TCI-State (s) and/or TCI-UL-State (s) provided by a TCI codepoint for the CC (s) in a cell set for multi-cell scheduling and/or CC lists for uTCI update.

With respect to example#2, the present disclosure describes various embodiments for applying TCI state indication in DCI (e.g., in DCI format 1_3) by one of following methods (options) , when unified TCI is configured and the HARQ-ACK feedback for the multiple PDSCHs are not all positive HARQ-ACK.

For one option (Option 1) , the exemplary method may include applying TCI state indication in DCI (e.g., in DCI format 1_3) to all CCs in the cell set if at least one ACK is received. With respect to example#2, the exemplary method may apply to cell #0, 1, 2, 3. The legacy mechanism based on SC-DCI allows to indicate the TCI update of multiple CCs based on SC-DCI scheduling for one PDSCH, one ACK feedback for the PDSCH can be used to confirm the TCI update. When multiple PDSCHs scheduled by DCI format 1_3 and at least one positive HARQ-ACK for one of the multiple PDSCHs is feedback, TCI states for all CCs in the CC list are applied. E.g. TCI state (s) and/or TCI-UL-State (s) for the CC (s) in a scheduledCellListDCI-1-3 are applied if at least one positive HARQ-ACK is feedback for the PDSCH at least on one serving cell in the scheduledCellListDCI-1-3, regardless the cells in the cell set are configured into one or multiple CC lists for uTCI updates.

For another option (Option 6) , the exemplary method may include applying TCI state indication in DCI (e.g., in DCI format 1_3) to all CCs in the CC lists if at least one CC list comprising the at least one CC in the cell set if at least one ACK is received. With respect to example#2, the exemplary method may apply to cell #0, 1, 2, 3, 4, 5, 6, 7. The legacy mechanism based on SC-DCI allows to indicate the TCI update of multiple CCs based on SC-DCI scheduling for one PDSCH, one ACK feedback for the PDSCH can be used to confirm the TCI update. When multiple PDSCHs scheduled by DCI format 1_3 and at least one positive HARQ-ACK for one of the multiple PDSCHs is feedback, TCI states for all CCs in the CC lists comprising the at least one CC in the cell set are applied. E.g. TCI state (s) and/or TCI-UL-State (s) for the CC (s) in CC list1 and list2 are applied if at least one positive HARQ-ACK is feedback for the PDSCH at least on one serving cell in the cell set#1.

For another option (Option 7) , the exemplary method may include applying TCI state indication in DCI (e.g., in DCI format 1_3) to all CCs in a CC list comprising the at least one CC in the cell set if at least one ACK is received, or the TCI state indication in DCI (e.g., in DCI format 1_3) is applied to all CCs in a CC list if at least one ACK is received for a CC in the CC list. With respect to example#2, the exemplary method may apply to cell #0, 1, 4, 5. That is, the CC list are applied in case one CC of the CCs within cell set is scheduled and positive HARQ-ACK is feedback, and the CC is configured in the CC list. The legacy mechanism based on SC-DCI allows to indicate the TCI update of multiple CCs based on SC-DCI scheduling for one PDSCH, one ACK feedback for the PDSCH can be used to confirm the TCI update. When multiple PDSCHs scheduled by DCI format 1_3 and at least one positive HARQ-ACK for one of the multiple PDSCHs on at least one cell is feedback, TCI states for all CCs in CC list1 comprising the at least one cell with ACK feedback in the cell set are applied. E.g. TCI state (s) and/or TCI-UL-State (s) for the CC (s) in CC list1 are applied if at least one positive HARQ-ACK is feedback for the PDSCH at least on one serving cell in the cell set#1.

For another option (Option 2) , the exemplary method may include applying TCI state indication in DCI (e.g., in DCI format 1_3) to all CCs in the cell set except the CC with NACK received. With respect to example#2, the exemplary method may apply to cell #0, 1, 3. If a NACK is feedback for a CC, it means that the CC may have poor channel quality or other issues. In this case, the TCI of the CC should not be updated, or the TCI indication is not updated if the NACK is feedback, in accordance with the current SC-DCI scheduling with NACK feedback. E.g. TCI state (s) and/or TCI-UL-State (s) for the CC (s) in a scheduledCellListDCI-1-3 are applied except the CC with negative HARQ-ACK for the scheduled PDSCH on the CC.

For another option (Option 8) , the exemplary method may include applying TCI state indication in DCI (e.g., in DCI format 1_3) to all CCs in the cell set and CC lists comprising the at least one CC in the cell set if ACK is received for the CC, and except the CC with NACK received. With respect to example#2, the exemplary method may apply to cell #0, 1, 3, 4, 5. If a NACK is feedback for a CC, it means that the CC may have poor channel quality or other issues. In this case, the TCI of the CC should not be updated, or the TCI indication is not updated if the NACK is feedback, in accordance with the current SC-DCI scheduling with NACK feedback. E.g. TCI state (s) and/or TCI-UL-State (s) for the CC (s) in a cell set#1 and CC list1 are applied except the cell 2 with negative HARQ-ACK for the scheduled PDSCH on the CC.

For another option (Option 3) , the exemplary method may include applying TCI state indication in DCI (e.g., in DCI format 1_3) to the CCs in the cell set and/or CC lists only with ACK received. With respect to example#2, the exemplary method may apply to cell #1. Since the feedback for the scheduled multiple PDSCHs on multiple cells comprises ACK and NACK, that is, it is uncertain whether to apply the TCI states for the non-scheduled cell. It is better not to apply for the sake of safety. E.g. TCI state (s) and/or TCI-UL-State (s) for the CC (s) in cell set#1 and/or CC list1/2 are applied except the CC with negative HARQ-ACK for the scheduled PDSCH on the CC and the CC without scheduled PDSCH.

For another option (Option 4) , the exemplary method may include applying TCI state indication in DCI (e.g., in DCI format 1_3) to the CCs in the cell set and/or CC lists if ACK received for all scheduled PDSCHs/CCs. With respect to example#2, the exemplary method may not apply to any cell. That is, do not apply to the CCs in the cell set and/or CC lists if at least one NACK is received. E.g. TCI state (s) and/or TCI-UL-State (s) for the CC (s) in the cell set and/or CC lists are applied if positive HARQ-ACK is feedback for all the PDSCH (s) on at least one serving cell in the cell set.

For another option (Option 5) , the exemplary method may include applying TCI state indication in DCI (e.g., in DCI format 1_3) to all CCs in the cell set and/or CC lists if one ACK is received for a cell which is the reference cell, or the cell with lowest/highest index of the scheduled cells or the configured cells in the cell set. In some implementations, the reference cell is predefined, or is configured by RRC signalling. In some implementations, the reference cell may be one cell in the cell set, and the DCI size and PDCCH monitoring of the multi-cell scheduling DCI is counted on the reference cell.

The legacy mechanism based on SC-DCI allows to indicate the TCI update of multiple CCs based on SC-DCI scheduling for one PDSCH, one ACK feedback for the PDSCH can be used to confirm the TCI update, therefore one cell/CC of the multiple cells/CCs scheduled by MC-DCI can be selected as the basis for determination whether to apply the TCI updates based on the HARQ-ACK feedback of the cell/CC. It can also be regarded as a special case in Option 1. With respect to example#2, the exemplary method may apply to cell #0, 1, 2, 3, 4, 5, 6, 7 when referring to reference cell#1; Or do not apply for any cell when referring to the lowest cell index (cell#0) . E.g. TCI state (s) and/or TCI-UL-State (s) for the CC (s) in the cell set and/or CC lists are applied if the UE is scheduled by the DCI format 1_3 to receive PDSCH at least on one serving cell in the cell set, and one positive HARQ-ACK is feedback for the PDSCH on a cell which is a reference cell or cell with the smallest serving cell index among the scheduled cells indicated by Scheduled cells indicator field or Frequency domain resource assignment field.

For another option (Option 12) , the exemplary method may include applying TCI state indication in DCI (e.g., in DCI format 1_3) to the CCs in the CC list (s) if the number of PDSCHs/CCs with ACK feedback is larger or no less than the number of PDSCHs/CCs with NACK feedback, or is larger or no less than a threshold. For example, the threshold may be 50%or other value. With respect to example#1, the exemplary method may apply to all cells/CCs because there the number of PDSCHs with ACK feedback is no less than the number of PDSCHs with NACK feedback. E.g. TCI state (s) and/or TCI-UL-State (s) for the CC (s) in CC list (s) are applied if multiple PDSCHs on multi-cell are scheduled on more than one CC and the number of PDSCHs with ACK feedback is larger or no less than the number of PDSCHs with NACK feedback.

For another option (Option 9) , the exemplary method may include applying TCI state indication in DCI (e.g., in DCI format 1_3) to the CCs in a CC list and also in the cell set comprising the at least one CC in the cell set if ACK is received for the CC. Alternatively, only the CCs in the CC list are applied in case one CC of the CCs within cell set is scheduled and positive HARQ-ACK is feedback, and the CC is configured in the CC list. With respect to example#2, the exemplary method may apply to cell #0, 1. If an ACK is feedback for a CC, the TCI of the CC and the corresponding CC list can be updated and further restricted in the cell set. E.g. TCI state (s) and/or TCI-UL-State (s) for the CC (s) in a cell set#1 and also in CC list1 are applied based on the cell 1 with positive HARQ-ACK feedback for the scheduled PDSCH on cell 1.

Various embodiments described in the present disclosure may have the following benefits: when unified TCI framework is configured, DCI format 1_3 can also update unified TCI state, TCI state indication in DCI format 1_3 is determined by feedback of one, partial or all cell (s) with ACK (s) if unified TCI is configured and the HARQ-ACK feedback for the multiple PDSCHs are not all positive HARQ-ACK. It is benefit to keep the same understanding between gNB and UE on the application of TCI updates in case multiple PDSCHs on multiple cells are scheduled by a single DCI.

Embodiment Set III

The present disclosure describes various embodiments for application of TCI. For another scenario (Scenario#3, which is similar to Scenario #2) , the cells in one cell set for multiple cells scheduling are different with the CCs in a CC list for unified TCI updates. That is, the cells in one cell set for multiple cells scheduling may be configured in more than one CC list for unified TCI updates.

For another option (Option 4) , one method includes applying TCI state indication in DCI (e.g., in DCI format 1_3) to the CCs in the cell set if ACK received for all scheduled PDSCHs/CCs.

For another option (Option 5) , one method includes applying TCI state indication in DCI (e.g., in DCI format 1_3) to all CCs in the cell set if one ACK is received for a cell which is the reference cell, or the cell with lowest/highest index.

For another option (Option 10) , one method includes applying TCI state indication in DCI (e.g., in DCI format 1_3) to the CCs in a CC list and also in the cell set comprising the at least one CC in the cell set if ACK is received for the CC, and except the CC with NACK received.

For one non-limiting example (example#4) , referring to FIG. 7, multiple PDSCHs (e.g. cell#1, 2) are scheduled by DCI format 1_3 at a time, while two scheduled cells belong to one CC list1; the HARQ-ACK feedback for the scheduled PDSCHs may comprise all positive HARQ-ACK, all negative HARQ-ACK, or mixed ACK and NACK, wherein for this particular example#3, ACK for cell#1 and NACK for cell#2. In some implementations, it is not clear whether/how to apply the indicated TCI-State (s) and/or TCI-UL-State (s) for the CC (s) in the cell set#1 and/or the CC list1, 2. In some implementations, based on current mechanism, only one PDSCH on a CC is scheduled by a single cell/carrier scheduling DCI (SC-DCI) , there are no multiple PDSCH multi-cell/carrier scheduling DCI (MC-DCI) . For example, in case two PDSCHs on two cells are scheduled by DCI format 1_3, with ACK feedback for one PDSCH and NACK for another PDSCH, it is not clear how to apply the TCI-State (s) and/or TCI-UL-State (s) provided by a TCI codepoint for the CC (s) in a cell set for multi-cell scheduling and/or CC lists for uTCI update.

With respect to example#3, the present disclosure describes various embodiments for applying TCI state indication in DCI (e.g., in DCI format 1_3) by one of following methods (options) , when unified TCI is configured and the HARQ-ACK feedback for the multiple PDSCHs are not all positive HARQ-ACK.

For one option (Option 1) , the exemplary method may include applying TCI state indication in DCI (e.g., in DCI format 1_3) to all CCs in the cell set if at least one ACK is received. With respect to example#3, the exemplary method may apply to cell #0, 1, 2, 3. The legacy mechanism based on SC-DCI allows to indicate the TCI update of multiple CCs based on SC-DCI scheduling for one PDSCH, one ACK feedback for the PDSCH can be used to confirm the TCI update. When multiple PDSCHs scheduled by DCI format 1_3 and at least one positive HARQ-ACK for one of the multiple PDSCHs is feedback, TCI states for all CCs in the CC list are applied. E.g. TCI state (s) and/or TCI-UL-State (s) for the CC (s) in a scheduledCellListDCI-1-3 are applied if at least one positive HARQ-ACK is feedback for the PDSCH at least on one serving cell in the scheduledCellListDCI-1-3, regardless the cells in the cell set are configured into one or multiple CC lists for uTCI updates.

For another option (Option 6) , the exemplary method may include applying TCI state indication in DCI (e.g., in DCI format 1_3) to all CCs in the CC lists if at least one CC list comprising the at least one CC in the cell set if at least one ACK is received. With respect to example#3, the exemplary method may apply to cell #0, 1, 2, 3, 4, 5, 6, 7. The legacy mechanism based on SC-DCI allows to indicate the TCI update of multiple CCs based on SC-DCI scheduling for one PDSCH, one ACK feedback for the PDSCH can be used to confirm the TCI update. When multiple PDSCHs scheduled by DCI format 1_3 and at least one positive HARQ-ACK for one of the multiple PDSCHs is feedback, TCI states for all CCs in the CC lists comprising the at least one CC in the cell set are applied. E.g. TCI state (s) and/or TCI-UL-State (s) for the CC (s) in CC list1 and list2 are applied if at least one positive HARQ-ACK is feedback for the PDSCH at least on one serving cell in the cell set#1.

For another option (Option 7) , the exemplary method may include applying TCI state indication in DCI (e.g., in DCI format 1_3) to all CCs in a CC list comprising the at least one CC in the cell set if at least one ACK is received, or the TCI state indication in DCI (e.g., in DCI format 1_3) is applied to all CCs in a CC list if at least one ACK is received for a CC in the CC list. With respect to example#3, the exemplary method may apply to cell #0, 1, 2, 5. That is, the CC list are applied in case one CC of the CCs within cell set is scheduled and positive HARQ-ACK is feedback, and the CC is configured in the CC list. The legacy mechanism based on SC-DCI allows to indicate the TCI update of multiple CCs based on SC-DCI scheduling for one PDSCH, one ACK feedback for the PDSCH can be used to confirm the TCI update. When multiple PDSCHs scheduled by DCI format 1_3 and at least one positive HARQ-ACK for one of the multiple PDSCHs on at least one cell is feedback, TCI states for all CCs in CC list1 comprising the at least one cell with ACK feedback in the cell set are applied. E.g. TCI state (s) and/or TCI-UL-State (s) for the CC (s) in CC list1 are applied if at least one positive HARQ-ACK is feedback for the PDSCH at least on one serving cell in the cell set#1.

For another option (Option 2) , the exemplary method may include applying TCI state indication in DCI (e.g., in DCI format 1_3) to all CCs in the cell set except the CC with NACK received. With respect to example#3, the exemplary method may apply to cell #0, 1, 3. If a NACK is feedback for a CC, it means that the CC may have poor channel quality or other issues. In this case, the TCI of the CC should not be updated, or the TCI indication is not updated if the NACK is feedback, in accordance with the current SC-DCI scheduling with NACK feedback. E.g. TCI state (s) and/or TCI-UL-State (s) for the CC (s) in a scheduledCellListDCI-1-3 are applied except the CC with negative HARQ-ACK for the scheduled PDSCH on the CC.

For another option (Option 8) , the exemplary method may include applying TCI state indication in DCI (e.g., in DCI format 1_3) to all CCs in the cell set and CC lists comprising the at least one CC in the cell set if ACK is received for the CC, and except the CC with NACK received. With respect to example#3, the exemplary method may apply to cell #0, 1, 3, 5. If a NACK is feedback for a CC, it means that the CC may have poor channel quality or other issues. In this case, the TCI of the CC should not be updated, or the TCI indication is not updated if the NACK is feedback, in accordance with the current SC-DCI scheduling with NACK feedback. E.g. TCI state (s) and/or TCI-UL-State (s) for the CC (s) in a cell set#1 and CC list1 are applied except the cell 2 with negative HARQ-ACK for the scheduled PDSCH on the CC.

For another option (Option 3) , the exemplary method may include applying TCI state indication in DCI (e.g., in DCI format 1_3) to the CCs in the cell set and/or CC lists only with ACK received. With respect to example#3, the exemplary method may apply to cell #1. Since the feedback for the scheduled multiple PDSCHs on multiple cells comprises ACK and NACK, that is, it is uncertain whether to apply the TCI states for the non-scheduled cell. It is better not to apply for the sake of safety. E.g. TCI state (s) and/or TCI-UL-State (s) for the CC (s) in cell set#1 and/or CC list1/2 are applied except the CC with negative HARQ-ACK for the scheduled PDSCH on the CC and the CC without scheduled PDSCH.

For another option (Option 4) , the exemplary method may include applying TCI state indication in DCI (e.g., in DCI format 1_3) to the CCs in the cell set and/or CC lists if ACK received for all scheduled PDSCHs/CCs. With respect to example#3, the exemplary method may not apply to any cell. That is, do not apply to the CCs in the cell set and/or CC lists if at least one NACK is received. E.g. TCI state (s) and/or TCI-UL-State (s) for the CC (s) in the cell set and/or CC lists are applied if positive HARQ-ACK is feedback for all the PDSCH (s) on at least one serving cell in the cell set.

The legacy mechanism based on SC-DCI allows to indicate the TCI update of multiple CCs based on SC-DCI scheduling for one PDSCH, one ACK feedback for the PDSCH can be used to confirm the TCI update, therefore one cell/CC of the multiple cells/CCs scheduled by MC-DCI can be selected as the basis for determination whether to apply the TCI updates based on the HARQ-ACK feedback of the cell/CC. It can also be regarded as a special case in Option 1. With respect to example#3, the exemplary method may apply to cell #0, 1, 2, 3, 4, 5, 6, 7 when referring to reference cell#1; Or do not apply for any cell when referring to the lowest cell index (cell#0) . E.g. TCI state (s) and/or TCI-UL-State (s) for the CC (s) in the cell set and/or CC lists are applied if the UE is scheduled by the DCI format 1_3 to receive PDSCH at least on one serving cell in the cell set, and one positive HARQ-ACK is feedback for the PDSCH on a cell which is a reference cell or cell with the smallest serving cell index among the scheduled cells indicated by Scheduled cells indicator field or Frequency domain resource assignment field.

For another option (Option 9) , the exemplary method may include applying TCI state indication in DCI (e.g., in DCI format 1_3) to the CCs in a CC list and also in the cell set comprising the at least one CC in the cell set if ACK is received for the CC. Atlernatively, only the CCs in the CC list and also in the cell set are applied in case one CC of the CCs within cell set is scheduled and positive HARQ-ACK is feedback. With respect to example#3, the exemplary method may apply to cell #0, 1, 2. If an ACK is feedback for a CC, the TCI of the CC and the corresponding CC list can be updated and further restricted in the cell set. E.g. TCI state (s) and/or TCI-UL-State (s) for the CC (s) in a cell set#1 and also in CC list1 are applied based on the cell 1 with positive HARQ-ACK feedback for the scheduled PDSCH on cell 1.

For another option (Option 10) , the exemplary method may include applying TCI state indication in DCI (e.g., in DCI format 1_3) to the CCs in a CC list and also in the cell set comprising the at least one CC in the cell set if ACK is received for the CC, and except the CC with NACK received. Alternatively, only the CCs in the CC list and also in the cell set are applied in case one CC of the CCs within cell set is scheduled and positive HARQ-ACK is feedback, and except the CC of the CCs within cell set is scheduled and negative HARQ-ACK is feedback. With respect to example#3, the exemplary method may apply to cell #0, 1. If an ACK is feedback for a CC, the TCI of the CC and the corresponding CC list can be updated and further restricted in the cell set. If a NACK is feedback for a CC, it means that the CC may have poor channel quality or other issues. In this case, the TCI of the CC should not be updated, or the TCI indication is not updated if the NACK is feedback, in accordance with the current SC-DCI scheduling with NACK feedback. E.g. TCI state (s) and/or TCI-UL-State (s) for the CC (s) in a cell set#1 and also in CC list1 are applied based on the cell 1 with ACK feedback for the scheduled PDSCH on cell 1, except the cell 2 with NACK feedback.

Embodiment Set IV

The present disclosure describes various embodiments for application of TCI. For another scenario (Scenario#4) , one cell in a CC list for unified TCI updates is also configured with multi-PDSCH scheduling (pdsch-TimeDomainAllocationListForMultiPDSCH) . As shown in FIG. 8, cell 0 is configured with multi-PDSCH scheduling, and cell 0, 1, 2, 3 are configured as a CC list for uTCI update (simultaneousU-TCI-UpdateList1-r17) .

In some implementations, for a single slot PDSCH, the indicated TCI state (s) may be based on the activated TCI states in the slot with the scheduled PDSCH. For a multi-slot PDSCH or the UE is configured with higher layer parameter pdsch-TimeDomainAllocationListForMultiPDSCH, the indicated TCI state (s) may be based on the activated TCI states in the first slot with the scheduled PDSCH (s) , and UE may expect the activated TCI states are the same across the slots with the scheduled PDSCH (s) .

In some implementations, for DCI format 1_1/1_2 used for single carrier/cell scheduling, unified TCI update is supported for CA, i.e., unified TCI update may be indicated by single DCI for multiple CCs. Based on the unified TCI update for CA with DCI format 1_1/1_2, it has been already supported that indicated TCI state is applied not only for scheduled cell but also for non-scheduled cell. In some implementations, the indicated TCI-State (s) and/or TCI-UL-State (s) (unified TCI update) should be applied for if ACK is feedback for the PDSCH after a time offset.

In some implementations, for scenario#4, in case multiple PDSCHs on cell 0 is scheduled, and the feedback may comprise all positive HARQ-ACK, all negative HARQ-ACK, or mixed ACK and NACK. In some implementations, it is not clear whether/how to apply the indicated TCI-State (s) and/or TCI-UL-State (s) for the CC (s) in CC list1 comprising cell 0, 1, 2, 3.

The present disclosure describes various embodiments for applying TCI state indication in DCI (e.g., in DCI format 1_1/1_2) by one of following methods (options) , when unified TCI is configured and the HARQ-ACK feedback for the multiple PDSCHs on one cell are not all positive HARQ-ACK.

For one option (Option 0) , a restriction may be applied that the UE does not expect the number of PDSCH scheduled on one cell is more than one in case multi-PDSCH scheduling is configured on the cell. That is, if a UE is configured with pdsch-TimeDomainAllocationListForMultiPDSCH in which one or more rows contain multiple SLIVs for PDSCH on a DL BWP of a serving cell, and the UE is receiving a DCI carrying the TCI-State indication, the UE does not expect that the number of indicated SLIVs in the row of the pdsch-TimeDomainAllocationListForMultiPDSCH by the DCI is more than one.

For another option (Option 1) , one method includes applying TCI state indication in DCI (e.g., in DCI format 1_1/1_2) to all CCs in the CC list if at least one ACK is received.

For another option (Option 4) , one method includes applying TCI state indication in DCI (e.g., in DCI format 1_1/1_2) to the CCs in the CC list if ACK received for all scheduled PDSCHs.

For another option (Option 5) , one method includes applying TCI state indication in DCI (e.g., in DCI format 1_1/1_2) to all CCs in the CC list if one ACK is received for a PDSCH which is the reference PDSCH, or the PDSCH with lowest/highest index.

For another option (Option 11) , one method includes applying TCI state indication in DCI (e.g., in DCI format 1_1/1_2) to all CCs in the CC list if at least one ACK for a PDSCH is received, and except the CC with at least one NACK received.

For another option (Option 12) , one method includes applying TCI state indication in DCI (e.g., in DCI format 1_1/1_2) to the CCs in the CC list if the number of PDSCHs with ACK feedback is larger or no less than the number of PDSCHs with NACK feedback, or is larger or no less than a threshold.

For one non-limiting example (example#4) , referring to FIG. 8, Cell 0 is configured with multi-PDSCHs scheduling, and cell 0, 1, 2, 3 are also configured as a CC list for uTCI update (simultaneousU-TCI-UpdateList1-r17) . Multiple PDSCHs are scheduled by DCI format 1_1/1_2 at a time; the HARQ-ACK feedback for the scheduled PDSCHs may comprise all positive HARQ-ACK, all negative HARQ-ACK, or mixed ACK and NACK. This particularly non-limiting example may include ACK for PDSCH1, NACK for PDSCH2, NACK for PDSCH3, and NACK for PDSCH4.

With respect to example#2, the present disclosure describes various embodiments for applying TCI state indication in DCI (e.g., in DCI format 1_1/1_2) by one of following methods (options) , when unified TCI is configured and the HARQ-ACK feedback for the multiple PDSCHs on one cell are not all positive HARQ-ACK.

For one option (Option 1) , the exemplary method may include applying TCI state indication in DCI (e.g., in DCI format 1_1/1_2) to all CCs in the cell list if at least one ACK is received. With respect to example#4, the exemplary method may apply to cell #0, 1, 2, 3. The legacy mechanism based on SC-DCI allows to indicate the TCI update of multiple CCs based on SC-DCI scheduling for one PDSCH, one ACK feedback for the PDSCH can be used to confirm the TCI update. When multiple PDSCHs scheduled by DCI format 1_1/1_2 and at least one positive HARQ-ACK for one of the multiple PDSCHs is feedback, TCI states for all CCs in the CC list are applied. E.g. TCI state (s) and/or TCI-UL-State (s) for the CC (s) in a CC list are applied if at least one positive HARQ-ACK is feedback for the PDSCH at least on one serving cell in the CC list.

For another option (Option 4) , the exemplary method may include applying TCI state indication in DCI (e.g., in DCI format 1_1/1_2) to the CCs in the CC list if ACK received for all scheduled PDSCHs. With respect to example#4, the exemplary method may not apply to any cell. That is, do not apply to the CCs in the CC list if at least one NACK is received. E.g. TCI state (s) and/or TCI-UL-State (s) for the CC (s) in a CC list are applied if positive HARQ-ACK is feedback for all the PDSCH (s) on the CC in the CC list.

For another option (Option 5) , the exemplary method may include applying TCI state indication in DCI (e.g., in DCI format 1_1/1_2) to all CCs in the CC list if one ACK is received for a PDSCH which is the reference PDSCH, or the PDSCH with lowest/highest index of the scheduled PDSCHs. In some implementations, the reference cell is predefined, or is configured by RRC signalling. In some implementations, the reference cell may be one cell in the cell set, and the DCI size and PDCCH monitoring of the multi-cell scheduling DCI is counted on the reference cell.

In some implementations, the legacy mechanism based on SC-DCI allows to indicate the TCI update of multiple CCs based on SC-DCI scheduling for one PDSCH, one ACK feedback for the PDSCH can be used to confirm the TCI update, therefore one PDSCH of the multiple PDSCHs scheduled can be selected as the basis for determination whether to apply the TCI updates based on the HARQ-ACK feedback of the PDSCH . It can also be regarded as a special case in Option 1. With respect to example#4, the exemplary method may apply to cell #0, 1, 2, 3 when referring to the lowest PDSCH index (PDSCH1) ; Or do not apply for any cell when referring to reference PDSCH2. E.g. TCI state (s) and/or TCI-UL-State (s) for the CC (s) in a CC list are applied if the UE is scheduled with multi-PDSCH on one CC which is in the CC list, and one positive HARQ-ACK is feedback for the PDSCH which is a reference PDSCH or the PDSCH with the smallest index among the scheduled PDSCHs indicated by time domain resource assignment field.

For another option (Option 11) , the exemplary method may include applying TCI state indication in DCI (e.g., in DCI format 1_1/1_2) to all CCs in the CC list if at least one ACK for a PDSCH is received, and except the CC with at least one NACK received. With respect to example#4, the exemplary method may apply to cell #1, 2, 3. If a NACK is feedback for a CC, it means that the CC may have poor channel quality or other issues. In this case, the TCI of the CC should not be updated, or the TCI indication is not updated if the NACK is feedback, in accordance with the current SC-DCI scheduling with NACK feedback. E.g. TCI state (s) and/or TCI-UL-State (s) for the CC (s) in a CC list are applied except the CC with negative HARQ-ACK for the scheduled PDSCH on the CC.

For another option (Option 12) , the exemplary method may include applying TCI state indication in DCI (e.g., in DCI format 1_1/1_2) to the CCs in the CC list if the number of PDSCHs with ACK feedback is larger or no less than the number of PDSCHs with NACK feedback, or is larger or no less than a threshold. For example, the threshold may be 50%or other value. With respect to example#4, the exemplary method may not apply to any cell because the number of PDSCHs with ACK feedback is less than the number of PDSCHs with NACK feedback. E.g. TCI state (s) and/or TCI-UL-State (s) for the CC (s) in a CC list are applied if multi-PDSCH is scheduled on one CC and the number of PDSCHs with ACK feedback is larger or no less than the number of PDSCHs with NACK feedback.

Various embodiments described in the present disclosure may have the following benefits: when unified TCI framework is configured, DCI format 1_1/1_2 can also update unified TCI state with multi-PDSCH scheduling configured, TCI state indication in DCI format 1_1/1_2 is determined by feedback of one, partial or all cell (s) with ACK (s) if unified TCI is configured and the HARQ-ACK feedback for the multiple PDSCHs are not all positive HARQ-ACK. It is benefit to keep the same understanding between gNB and UE on the application of TCI updates in case multiple PDSCHs on one cell are scheduled by a single DCI.

The present disclosure describes methods, apparatus, and computer-readable medium for application of TCI. The present disclosure addressed the issues with DCI-based beam indication mechanism in a wireless communication system. The methods, devices, and computer-readable medium described in the present disclosure may facilitate the performance of carrier based communication, thus improving efficiency and overall performance. The methods, devices, and computer-readable medium described in the present disclosure may improves the overall efficiency of the wireless communication systems.

In some other embodiments, a computer-readable medium comprising instructions which, when executed by a computer, cause the computer to carry out the above methods. The computer-readable medium may be referred as non-transitory computer-readable media (CRM) that stores data for extended periods such as a flash drive or compact disk (CD) , or for short periods in the presence of power such as a memory device or random access memory (RAM) . In some embodiments, computer-readable instructions may be included in a software, which is embodied in one or more tangible, non-transitory, computer-readable media. Such non-transitory computer-readable media can be media associated with user-accessible mass storage as well as certain short-duration storage that are of non-transitory nature, such as internal mass storage or ROM. The software implementing various embodiments of the present disclosure can be stored in such devices and executed by a processor (or processing circuitry) . A computer-readable medium can include one or more memory devices or chips, according to particular needs. The software can cause the processor (including CPU, GPU, FPGA, and the like) to execute particular processes or particular parts of particular processes described herein, including defining data structures stored in RAM and modifying such data structures according to the processes defined by the software. In various embodiments in the present disclosure, the term “processor” may mean one processor that performs the defined functions, steps, or operations or a plurality of processors that collectively perform defined functions, steps, or operations, such that the execution of the individual defined functions may be divided amongst such plurality of processors.

Reference throughout this specification to features, advantages, or similar language does not imply that all of the features and advantages that may be realized with the present solution should be or are included in any single implementation thereof. Rather, language referring to the features and advantages is understood to mean that a specific feature, advantage, or characteristic described in connection with an embodiment is included in at least one embodiment of the present solution. Thus, discussions of the features and advantages, and similar language, throughout the specification may, but do not necessarily, refer to the same embodiment.

Furthermore, the described features, advantages and characteristics of the present solution may be combined in any suitable manner in one or more embodiments, for non-limiting examples, a portion from one or more embodiment may be combined with another portion of other embodiments. One of ordinary skill in the relevant art will recognize, in light of the description herein, that the present solution can be practiced without one or more of the specific features or advantages of a particular embodiment. In other instances, additional features and advantages may be recognized in certain embodiments that may not be present in all embodiments of the present solution.

Claims

A method for wireless communication, performed by a wireless communication device, comprising:

interpreting, by a user equipment (UE) , a transmission configuration indicator (TCI) state indication in a downlink control information (DCI) based on hybrid automatic repeat request acknowledgement (HARQ-ACK) feedback for multiple physical downlink shared channel (PDSCH) transmissions scheduled by the DCI, wherein:

the multiple PDSCH transmissions are transmitted on at least one cell or carrier (CC) , and

the TCI state indication corresponds to at least one CC list for simultaneous unified TCI update.
A method for wireless communication, performed by a wireless communication node, comprising:

interpreting, by a base station, a transmission configuration indicator (TCI) state indication in a downlink control information (DCI) based on hybrid automatic repeat request acknowledgement (HARQ-ACK) feedback for multiple physical downlink shared channel (PDSCH) transmissions scheduled by the DCI, wherein:

the multiple PDSCH transmissions are transmitted on at least one cell or carrier (CC) , and

the TCI state indication corresponds to at least one CC list for simultaneous unified TCI update.
The method according to any of claims 1 to 2, wherein:

the multiple PDSCH transmissions are transmitted on at least one CC in a CC set configured for multi-CC scheduling; or

the multiple PDSCH transmissions are transmitted on one CC .
The method according to any of claims 3, wherein:

the multiple PDSCH transmissions are transmitted on at least one CC in the CC set; and

CCs in the CC set are configured in a CC list, or same as all CCs in a CC list.
The method according to claim 3 and 4, wherein:

in response to the HARQ-ACK feedback for the multiple PDSCH transmissions comprising at least one positive HARQ-ACK (ACK) :

the TCI state indication is applied to all CCs in the CC set or CC list;

the TCI state indication is applied to all CCs in the CC set or CC list, except a CC in which negative HARQ-ACK (NACK) is received; or

the TCI state indication is only applied to the CC in the CC set or CC list in which ACK is received.
The method according to claim 3 and 4, wherein:

in response to the HARQ-ACK feedback for the multiple PDSCH transmissions comprising all ACK, the TCI state indication is applied to all CCs in the CC set or CC list.
The method according to claim 3 and 4, wherein:

in response to the HARQ-ACK feedback for the multiple PDSCH transmissions comprising at least one ACK for a pre-defined CC, the TCI state indication is applied to all CCs in the CC set or CC list,

wherein the pre-defined CC comprises one of the following: a reference CC, a CC with a lowest index among the scheduled CCs, a CC with a highest index among the scheduled CCs, or a pre-configured CC.
The method according to claim 3, wherein:

the multiple PDSCH transmissions are transmitted on at least one CC in the CC set; and

CCs in the CC set are configured in more than one CC lists.
The method according to any of claims 3 and 8, wherein:

in response to the HARQ-ACK feedback for the multiple PDSCH transmissions comprising at least one ACK:

the TCI state indication is applied to all CCs in the CC set;

the TCI state indication is applied to all CCs in the CC set, except a CC in which NACK is received;

the TCI state indication is only applied to CC in the CC set in which ACK is received;

the TCI state indication is applied to all CCs in the more than one CC lists;

the TCI state indication is applied to all CCs in a CC list when ACK is received for a CC in the CC list;

the TCI state indication is applied to all CCs in either the CC set or one or more CC list in the more than one CC lists in which ACK is received, except a CC in which NACK is received;

the TCI state indication is applied to all CCs in both the CC set and one or more CC list in the more than one CC lists in which ACK is received; or

the TCI state indication is applied to all CCs in both the CC set and one or more CC list in the more than one CC lists in which ACK is received, except a CC in which NACK is received.
The method according to any of claims 3 and 8, wherein:

in response to the HARQ-ACK feedback for the multiple PDSCH transmissions comprising all ACK, the TCI state indication is applied to all CCs in the CC set or all CCs in the more than one CC lists.
The method according to any of claims 3 and 8, wherein:

in response to the HARQ-ACK feedback for the multiple PDSCH transmissions comprising at least one positive ACK for a pre-defined CC, the TCI state indication is applied to all CCs in the CC set or all CCs in the more than one CC lists,

wherein the pre-defined CC comprises one of the following: a reference CC, a CC with a lowest index among the scheduled CCs, a CC with a highest index among the scheduled CCs, or a pre-configured CC.
The method according to claim 3, wherein:

the multiple PDSCH transmissions are transmitted on one CC; and

the CC is configured in a CC list.
The method according to claim 12, wherein:

in response to the HARQ-ACK feedback for the multiple PDSCH transmissions comprising at least one ACK:

the TCI state indication is applied to all CCs in the CC list; or

the TCI state indication is applied to all CCs in the CC list, except a CC in which NACK is received.
The method according to claim 12, wherein:

in response to the HARQ-ACK feedback for the multiple PDSCH transmissions comprising all ACK, the TCI state indication is applied to all CCs in the CC list.
The method according to claim 12, wherein:

in response to the HARQ-ACK feedback for the multiple PDSCH transmissions comprising at least one ACK for a reference PDSCH, the TCI state indication is applied to all CCs in the CC list,

wherein the reference PDSCH comprises one of the following: a PDSCH with a lowest index among the scheduled multiple PDSCH transmissions, a PDSCH with a highest index among the scheduled multiple PDSCH transmissions, or a pre-configured PDSCH.
The method according to claim 12, wherein:

in response to a number of ACKs in the HARQ-ACK feedback for the multiple PDSCH transmissions satisfying a per-defined condition, the TCI state indication is applied to all CCs in the CC list,

wherein the pre-defined condition comprises at least one of the following:

being larger than a number of NACKs in the HARQ-ACK feedback for the multiple PDSCH transmissions,

being no smaller than a number of NACKs in the HARQ-ACK feedback for the multiple PDSCH transmissions,

being larger than 50%,

being no smaller than 50%,

being larger than a threshold, or

being no smaller than a threshold.
A wireless communications apparatus comprising at least one processor and a memory, wherein the at least one processor is configured to read code from the memory and implement a method recited in any of claims 1 to 16.
A computer program product comprising a computer-readable program medium code stored thereupon, the computer-readable program medium code, when executed by at least one processor, causing the at least one processor to implement a method recited in any of claims 1 to 16.