Transmission configuration indicator state update

Abstract

The embodiment of the invention relates to equipment, a method, a device and a computer readable storage medium for transmission configuration indicator (TCI) state updating of multiple transmission receiving point (TRP) use conditions. The method includes obtaining, at a terminal device, information from a network node regarding application of at least one TCI state associated with a reference component carrier (CC) or a bandwidth portion (BWP) for at least one target CC or BWP, and determining, based on at least one of the following, whether the at least one TCI state associated with the reference CC or BWP is applied for the at least one target CC or BWP. One or more TCI states for application to at least one target CC or BWP are determined: information, a TRP mode for a reference CC or BWP, or a TRP mode for at least one target CC or BWP.

Description

Technical Field

[0001] Embodiments of the present disclosure generally relate to the field of telecommunications, and more particularly to devices, methods, apparatuses, and computer-readable storage media for transmission configuration indicator (TCI) status update for multiple transmission reception point (TRP) use cases. Background Art

[0002] The 3rd Generation Partnership Project (3GPP) studies enhance multi-beam operation by introducing new features to facilitate common TCI status updates for multi-TRP scenarios. In addition, 3GPP plans to extend the unified TCI framework (beam indication framework for DL ​​and UL) to all multi-TRP scenarios. Summary of the invention

[0003] Generally speaking, exemplary embodiments of the present disclosure provide a solution for TCI status update for multi-TRP use cases.

[0004] In a first aspect, an apparatus is provided. The apparatus includes: at least one processor; and at least one memory storing instructions, which when executed by the at least one processor causes the apparatus to at least: obtain information about applying at least one TCI state associated with a reference CC or bandwidth part (BWP) for at least one target component carrier (CC) or BWP from a network node; and determine one or more TCI states applied to at least one target CC or BWP based on at least one of the following items: information, or a transmission reception point TRP mode for the reference CC or BWP, or a TRP mode for at least one target CC or BWP.

[0005] In a second aspect, an apparatus is provided. The apparatus comprises: at least one processor; and at least one memory storing instructions, which when executed by the at least one processor causes the apparatus to at least: send information about applying at least one TCI state associated with a reference CC or BWP to a terminal device for at least one target CC or BWP.

[0006] In a third aspect, a method is provided. The method comprises: obtaining, at a terminal device, information from a network node about applying at least one TCI state associated with a reference CC or BWP for at least one target CC or BWP; and determining one or more TCI states applied to at least one target CC or BWP based on at least one of the following items: the information, or a TRP mode for the reference CC or BWP, or a TRP mode for at least one target CC or BWP.

[0007] In a fourth aspect, a method is provided. The method comprises: sending, from a network node to a terminal device, information about applying at least one TCI state associated with a reference CC or BWP for at least one target CC or BWP.

[0008] In a fifth aspect, an apparatus is provided, comprising: a component for obtaining information about applying at least one TCI state associated with a reference CC or BWP for at least one target CC or BWP from a network node; and a component for determining one or more TCI states applied to at least one target CC or BWP based on at least one of the following items: information, or a TRP mode for the reference CC or BWP, or a TRP mode for at least one target CC or BWP.

[0009] In a sixth aspect, an apparatus is provided, comprising: means for sending information about applying at least one TCI state associated with a reference CC or BWP to at least one target CC or BWP to a terminal device.

[0010] In a seventh aspect, a computer-readable medium is provided, on which a computer program is stored. When the computer program is executed by at least one processor of a device, the device executes the method according to the third aspect or the fourth aspect.

[0011] Other features and advantages of the embodiments of the present disclosure will become apparent from the following description of specific embodiments when read in conjunction with the accompanying drawings, which illustrate, by way of example, the principles of the embodiments of the present disclosure. BRIEF DESCRIPTION OF THE DRAWINGS

[0012] The embodiments of the present disclosure are presented in an exemplary sense, and their advantages are explained in more detail below with reference to the accompanying drawings.

[0013] Figure 1 An example environment is shown in which example embodiments of the present disclosure may be implemented;

[0014] Figure 2 shows a signaling diagram of a TCI state update procedure for a multi-TRP use case according to some example embodiments of the present disclosure;

[0015] Figure 3A and 3B shows an example of TCI status update for a multi-TRP use case according to some example embodiments of the present disclosure;

[0016] Figure 4 A flowchart illustrating an example method for TCI status update for a multi-TRP use case according to some example embodiments of the present disclosure;

[0017] Figure 5A flowchart illustrating an example method for TCI status update for a multi-TRP use case according to some example embodiments of the present disclosure;

[0018] Figure 6 shows a simplified block diagram of a device suitable for implementing an example embodiment of the present disclosure; and

[0019] Figure 7 A block diagram of an example computer-readable medium is shown according to some embodiments of the present disclosure.

[0020] In the accompanying drawings, the same or similar reference numerals may denote the same or similar elements. DETAILED DESCRIPTION

[0021] The principle of the present disclosure will now be described with reference to some example embodiments. It should be understood that these embodiments are described only for illustrative purposes and to help those skilled in the art understand and implement the present disclosure, and are not intended to limit the scope of the present disclosure in any way. The embodiments described herein can be implemented in various ways different from those described below.

[0022] In the following description and claims, unless defined otherwise, all technical and scientific terms used herein may have the same meaning as commonly understood by one of ordinary skill in the art to which this disclosure belongs.

[0023] References in this disclosure to "one embodiment," "an embodiment," "an exemplary embodiment," etc. indicate that the described embodiment may include a particular feature, structure, or characteristic, but not every embodiment must include the particular feature, structure, or characteristic. Furthermore, these phrases do not necessarily refer to the same embodiment. In addition, when a particular feature, structure, or characteristic is described in conjunction with an embodiment, it is considered to be within the knowledge of those skilled in the art to affect that feature, structure, or characteristic in conjunction with other embodiments (whether or not explicitly described).

[0024] It should be understood that although the terms "first", "second", etc. can be used to describe various elements in this article, these elements should not be limited by these terms. These terms are only used to distinguish one element from another element. For example, without departing from the scope of the exemplary embodiment, the first element can be referred to as the second element, and similarly, the second element can be referred to as the first element. As used herein, the term "and / or" includes any and all combinations of one or more listed terms.

[0025] As used herein, “at least one of: ” and “at least one of ” and similar expressions, where a list of two or more elements is connected by “and” or “or”, mean at least any one element, or at least any two or more elements, or at least all elements.

[0026] As used herein, unless explicitly stated, performing a step "in response to A" does not indicate that the step is performed immediately after "A" occurs, and may include one or more intermediate steps.

[0027] The terms used herein are used only for the purpose of describing specific embodiments and are not intended to limit the example embodiments. As used herein, the singular forms "a", "an", and "the" are also intended to include the plural forms unless the context clearly indicates otherwise. It will also be understood that the terms "comprises", "comprising", "having", "having" and / or "including" when used herein specify the presence of the features, elements and / or components, etc., but do not exclude the presence or addition of one or more other features, elements, components and / or combinations thereof.

[0028] As used in this application, the term "circuitry" may refer to one, more, or all of the following:

[0029] (a) hardware circuit implementation only (such as implementation only in analog and / or digital circuits) and

[0030] (b) a combination of hardware circuitry and software, such as (where applicable):

[0031] (i) a combination of analog and / or digital hardware circuit(s) with software / firmware, and

[0032] (ii) any portion of hardware processor(s) (including digital signal processor(s)), software and memory(s) with software that work together to enable a device (such as a mobile phone or server) to perform various functions, and

[0033] (c) Hardware circuit(s) and / or processor(s) (such as microprocessor(s) or portion(s) of microprocessor(s)) that require software (e.g., firmware) to operate, but in which case the software may not be present when not required for operation.

[0034] This definition of circuitry applies to all uses of the term in this application, including any claims. As another example, as used in this application, the term circuitry also covers an implementation of only a hardware circuit or processor (or multiple processors) or a portion of a hardware circuit or processor and its (or their) accompanying software and / or firmware. For example, if applicable to a particular claim element, the term "circuitry" also covers a baseband integrated circuit or processor integrated circuit for a mobile device, or a similar integrated circuit in a server, cellular network device, or other computing or network device.

[0035] As used herein, the term "communication network" refers to a network that complies with any appropriate communication standard, such as New Radio (NR), Long Term Evolution (LTE), Advanced LTE (LTE-A), Wideband Code Division Multiple Access (WCDMA), High Speed ​​Packet Access (HSPA), Narrowband Internet of Things (NB-IoT), etc. In addition, the communication between the terminal equipment and the network node in the communication network can be performed according to any appropriate generation of communication protocols, including but not limited to the first generation (1G), the second generation (2G), 2.5G, 2.75G, the third generation (3G), the fourth generation (4G), 4.5G, the fifth generation (5G) and / or any other protocol currently known or developed in the future. The embodiments of the present disclosure can be applied to various communication systems. Due to the rapid development of communication, there will certainly be future types of communication technologies and systems, which can be used to implement the present disclosure. The scope of the present disclosure should not be considered to be limited to the above-mentioned systems.

[0036] As used herein, the term "network node" refers to a node in a communication network, via which a terminal device accesses the network and receives services from it. A network node may refer to a base station (BS) or an access point (AP), such as a NodeB (NodeB or NB), an evolved NodeB (eNodeB or eNB), a NR NB (also referred to as a gNB), a remote radio unit (RRU), a radio head (RH), a remote radio head (RRH), a relay, an integrated access and backhaul (IAB) node, a low-power node (such as a femto or micro), a non-terrestrial network (NTN) or a non-terrestrial network (such as a satellite network device, a low earth orbit (LEO) satellite and a geosynchronous orbit (GEO) satellite, an aircraft network device), etc., depending on the terminology and technology applied. In some example embodiments, a radio access network (RAN) split architecture includes a centralized unit (CU) and a distributed unit (DU) at an IAB donor node. An IAB node includes a mobile terminal (IAB-MT) portion, which behaves as a UE for a parent node, and a DU portion of an IAB node, which behaves as a base station for a next-hop IAB node.

[0037] The term "terminal device" refers to any terminal device capable of wireless communication. As an example and not limitation, the terminal device may also be referred to as a communication device, a user equipment (UE), a subscriber station (SS), a portable subscriber station, a mobile station (MS) or an access terminal (AT). The terminal device may include, but is not limited to, a mobile phone, a cellular phone, a smart phone, a voice over IP (VoIP) phone, a wireless local loop phone, a tablet computer, a wearable terminal device, a personal digital assistant (PDA), a portable computer, a desktop computer, an image capture terminal device (such as a digital camera), a game terminal device, a music storage and playback device, a vehicle-mounted wireless terminal device, a wireless endpoint, a mobile station, a laptop embedded device (LEE), a laptop mounted device (LME), a USB dongle, a smart device, a wireless client device (CPE), an Internet of Things (IoT) device, a watch or other wearable device, a head mounted display (HMD), a vehicle, a drone, medical equipment and applications (such as remote surgery), industrial equipment and applications (such as robots and / or other wireless devices running in industrial and / or automatic processing chain environments), consumer electronic devices), equipment operating on commercial and / or industrial wireless networks, etc. The terminal device may also correspond to the mobile terminal (MT) part of an IAB node (eg, a relay node).In the following description, the terms "terminal device", "communication device", "terminal", "user equipment" and "UE" are used interchangeably.

[0038] As used herein, the terms "resource", "transmission resource", "resource block", "physical resource block" (PRB), "uplink resource" or "downlink resource" may refer to any resource used to perform communication, for example, between a terminal device and a network node, such as a resource in the time domain, a resource in the frequency domain, a resource in the space domain, a resource in the code domain, or any other resource that enables communication. In the following, unless explicitly stated, resources in the frequency domain and the time domain will be used as examples of transmission resources for describing some exemplary embodiments of the present disclosure. Note that the exemplary embodiments of the present disclosure are equally applicable to other resources in other domains.

[0039] Figure 1 1 shows an example of a communication network 100 in which embodiments of the present disclosure may be implemented. Figure 1 As shown, the communication network 100 may include a terminal device 110. The terminal device 110 may also be referred to as UE 110 hereinafter.

[0040] The communication network 100 may further include a network node 120. Hereinafter, the network node 120 may also be referred to as a gNB 120. The terminal device 110 may communicate with the network node 120.

[0041] It should be understood that Figure 1The number of network nodes and terminal devices shown in FIG. 1 is given for illustrative purposes and does not imply any limitation. Communication network 100 may include any suitable number of network nodes and terminal devices.

[0042] In some example embodiments, the link from the network node 120 to the terminal device 110 may be referred to as a downlink (DL), and the link from the terminal device 110 to the network node 120 may be referred to as an uplink (UL). In the DL, the network node 120 is a transmitting (TX) device (or transmitter), and the terminal device 110 is a receiving (RX) device (or receiver). In the UL, the terminal device 110 is a TX device (or transmitter), and the network node 120 is a RX device (or receiver).

[0043] Communications in the communication environment 100 may be implemented according to any appropriate (multiple) communication protocols, including but not limited to first generation (1G), second generation (2G), third generation (3G), fourth generation (4G), fifth generation (5G), sixth generation (6G), etc. cellular communication protocols, wireless local network communication protocols (such as Institute of Electrical and Electronics Engineers (IEEE) 802.11, etc.), and / or any other protocols currently known or developed in the future. In addition, communications may utilize any appropriate wireless communication technology, including but not limited to code division multiple access (CDMA), frequency division multiple access (FDMA), time division multiple access (TDMA), frequency division duplex (FDD), time division duplex (TDD), multiple input multiple output (MIMO), orthogonal frequency division multiplexing (OFDM), discrete Fourier transform spread OFDM (DFT-s-OFDM) and / or any other technology currently known or developed in the future.

[0044] Multi-TRP scenarios have been studied in Release 17. In the multi-TRP uplink (UL) scheme, a single downlink control information (DCI) multi-TRP time division multiplexing (TDM) physical uplink control channel (PUCCH) repetition operation is specified in both frequency range 1 (FR1) and frequency range 2 (FR2).

[0045] For multi-TRP TDM PUCCH repetition operation in FR2, one PUCCH resource is used and two spatial relationship information for one PUCCH resource are activated via the Media Access Control-Control Element (MAC-CE), while for multi-TRP TDM PUCCH repetition operation in FR1, one PUCCH resource is used and two power control parameter sets for one PUCCH resource are activated via the (new) MAC-CE.

[0046] Two multi-TRP TDM PUCCH repetition schemes are supported, namely, the inter-slot repetition scheme based on slot repetition of PUCCH and the intra-slot repetition scheme based on sub-slot repetition of PUCCH.

[0047] When only multi-TRP TDM physical uplink shared channel (PUSCH) repetition operation based on a single DCI is supported, the multi-TRP TDM PUSCH repetition scheme can be based on PUSCH repetition type A and type B discussed in Release 15 and Release 16.

[0048] Multi-TRP TDM PUSCH repetition operation may be enabled using at least two sounding reference signal (SRS) resource sets configured for both codebook-based mode and non-codebook-based mode. The two SRS resource sets may have the same number of SRS resources.

[0049] In Release 17, a unified TCI framework was introduced, which means that the TCI states that so far provided the quasi co-location (QCL) assumption for the reception of downlink (DL) signals and channels can also be used to provide spatial sources for the transmission of UL signals and channels.

[0050] The unified TCI framework defines the concept of indicated TCI states. The indicated TCI states can be joint DL and UL TCI states or separate DL and separate UL TCI states. The indicated TCI states provide QCL sources (DL) and spatial sources (UL) for downlink signals and channel sets and uplink signals and channel sets, respectively. In Release 17, there can be one indicated joint DL and UL or one indicated DL and one indicated UL TCI state for a UE.

[0051] The unified TCI framework may include the following advanced features. For example, a common TCI state (also referred to as indicated TCI) for a set of signals and channels at one time. The TCI states may be a joint DL / UL TCI state or a separate DL TCI state and a separate UL TCI state, respectively. A set (or pool) of joint and / or separate TCI states may be configured by radio resource control (RRC). The MAC may activate a certain number (e.g., 8) of joint and / or separate TCI states. Prior to the indication, the first activated TCI state may be the currently indicated TCI state. The DCI may indicate that one of the activated TCI states is the indicated TCI state, which may also be considered a common TCI state.

[0052] For DCI-based TCI state indication, DCI format 1_1 / 1_2 with and without DL allocation can be used to carry the TCI state indication. The indication can be confirmed by the UE using HARQ ACK. For the application time of the beam indication, the first time slot can be at least X ms or Y symbols after the last symbol of the confirmation of the joint or separate DL / UL beam indication. The TCI field code point can be configured for both joint DL / UL or separate DL and UL cases. The TCI field code point for the joint DL / UL case can refer to the TCI state for both DL and UL, while the TCI field code point for the separate DL and UL cases can refer to a pair of DL TCI state and UL TCI state, DL TCL state and UL TCL state.

[0053] A common TCI update may refer to an update of the indicated TCI state. If the RRC-configured TCI state pool is missing in the physical downlink shared channel (PDSCH) configuration for each BWP / CC and is replaced by a reference to the RC-configured TCI state pool in the reference BWP / CC, the source reference signal (RS) of the indicated TCI state may provide the RS for the QCL of the demodulation reference signal (DM-RS) for the PDSCH, the DM-RS for the physical downlink control channel (PDCCH) and the channel state information reference signal (CSI-RS) in the configured CC set, and, if applicable, a reference for determining the UL TX spatial filter for PUSCH and SRS for dynamic grant and based on the configured grant in the configured CC set.

[0054] If an RRC-configured TCI state pool is configured in the PDSCH configuration for each BWP / CC, the source RS in each CC is associated with the source RS of the indicated TCI state to provide the RS for the QCL of the DM-RS for PDSCH, the DM-RS for PDCCH and the CSI-RS in the CC, and, if applicable, a reference for determining the UL TX spatial filter for the PUSCH and SRS in the CC for dynamic grant and based on the configured grant.

[0055] As mentioned above, the extension of the unified TCI framework for indication of multiple DL and UL TCI states can focus on the multi-TRP use case. Therefore, how to define the common TCI state update operation in the case of multiple TRPs may require further discussion.

[0056] According to some example embodiments of the present disclosure, a solution for TCI state update for multiple TRP use cases is provided. In the solution, the UE obtains information (and / or configuration) at least indicating at least one TCI state associated with a reference CC or BWP for at least one target CC or BWP, which essentially indicates, configures and / or enables the UE to determine which TCI state of the TCI state associated with or corresponding to the reference CC or BWP is applicable to the target CC or BWP. Based on at least one of the information or TRP modes for the reference CC or BWP and / or at least one target CC or BWP, the UE determines one or more TCI states to be applied to at least one target CC or BWP. In this way, an effective solution for common TCI states across CC / BWPs can be achieved without increasing control overhead and taking into account multiple TRP use cases.

[0057] It should be understood that the TRP mode used below may refer to a single TRP mode or a multi-TRP mode.

[0058] Hereinafter, exemplary embodiments of the present disclosure will be described in detail with reference to the accompanying drawings.

[0059] Reference now Figure 2 , which shows a signaling diagram 200 for communication according to some exemplary embodiments of the present disclosure. Figure 2 As shown, signaling diagram 200 involves UE 110 and gNB 120. For discussion purposes, reference is made to Figure 1 Signaling diagram 200 is described.

[0060] like Figure 2 As shown, the gNB 120 may send 202 information (and / or configuration) to the UE 110, for example, information (and / or configuration) associated with or corresponding to (multiple) TCI states. For example, the information (and / or configuration) may indicate (and / or configure) whether at least one of the two TCI states indicated by the reference CC or BWP (which may also be considered as the first CC or BWP or any other suitable / applicable CC or BWP) is to be applied to at least one target CC or BWP. The at least one target CC or BWP used hereinafter may also be referred to as at least one given CC or BWP. It should be understood that the reference CC or BWP may also be any CC or BWP in the set of CCs or BWPs.

[0061] In some example embodiments, at least one given CC or BWP and the reference CC or BWP may belong to the same CC or BWP set (list or group).It should be understood that the term CC or BWP in the present solution may also be replaced by cell.

[0062] In some example embodiments, information associated with or corresponding to (multiple) TCI states may be configured or operated for each CC or each CC subset. Alternatively or optionally, information associated with or corresponding to (multiple) TCI states may also be configured or operated for each physical channel, such as PDCCH, PDSCH, PUCCH, or PUSCH. It is also possible that the information may also be configured or operated for reference signals, such as SRS or CSI-RS. As another option, the information may also be configured or operated per transmission direction, for example, UL direction or DL ​​direction.

[0063] In some example embodiments, information associated with or corresponding to the TCI state(s) may be sent via broadcast signaling, RRC signaling, MAC-CE, or DCI to UE 110. In some other example embodiments, the information may be at least partially replaced or referred to as a configuration or pre-configuration, based on which the UE may be configured to follow some rules / conditions in order to enable the UE to determine which and / or whether TCI state applies to at least one target CC or BWP from the TCI states corresponding to the reference CC or BWP.

[0064] After obtaining the information, UE 110 may determine one or more TCI states for at least one given CC / BWP based on the information or at least one of the TRP patterns for the reference CC / BWP or the TRP patterns for at least one given CC or BWP.

[0065] It should be understood that the TRP mode used below may refer to a single TRP mode or a multiple TRP mode. The TRP mode applicable to a CC or BWP in a reference CC or BWP and / or at least one given CC / BWP may be based on a preconfigured / predetermined configuration. For example, if the multiple TRP mode is not configured in the CC or BWP, it is assumed that the single TRP mode is configured or determined in the CC or BWP. If a single TCI state is indicated or applicable in the CC or BWP, it is also possible that the single TRP mode is applicable in the CC / BWP. If at least two CORESETPoolIndex are not configured in the CC or BWP (or no CORESETPoolIndex is configured), it is also possible that the single TRP mode is applicable in the CC / BWP.

[0066] In addition, if at least two TCI states are indicated or applicable in the CC or BWP, the multi-TRP mode is applicable in the CC / BWP. In addition, if at least one SDM scheme, i.e., a multi-TRP TDM scheme or a simultaneous UL transmission scheme is configured or applicable in the CC or BWP, the multi-TRP mode is applicable in the CC or BWP. If at least two CORESETPoolIndex are configured in the CC or BWP, it is also possible that the multi-TRP mode is applicable in the CC / BWP.

[0067] In some exemplary embodiments, if UE 110 determines that two TCI states are indicated for a reference CC or BWP, and at least one given CC / BWP is configured to be applied to the two indicated TCI states, UE 110 may determine that the two indicated TCI states are applied to at least one given CC / BWP. In this case, the order of the two TCI states for the reference CC / BWP may also be indicated in the information. UE 110 may apply the two indicated TCI states based on the order.

[0068] In some other example embodiments, if UE 110 determines that two TCI states are indicated for a reference CC or BWP, and at least one given CC / BWP is configured to follow one indicated TCI state, UE 110 may determine a TCI state to be applied to at least one given CC / BWP from the two indicated TCI states, e.g., based on an index or ordering of the TCI states of the two indicated TCI states indicated from the information. For example, the information may indicate that UE 110 may follow the TCI state having the highest or lowest index of the TCI state among the two indicated TCI states.

[0069] In some example embodiments, if a reference CC / BWP is configured with a single TRP or a multi-TRP scheme and only one TCI state is indicated or applicable, the UE 110 may determine, based on the information or at least one of the TRP modes, that the indicated / applicable TCI will be applicable to at least one given CC / BWP, regardless of whether the at least one given CC / BWP is configured with a multi-TRP scheme. Hereinafter, the above-mentioned single TRP or multi-TRP scheme may include a DL / UL multi-TRP scheme, such as a single DCI, multiple DCIs and / or frequency division multiplexing (FDM) / spatial division multiplexing (SDM) / TDM and / or simultaneous UL transmission.

[0070] As another option, if the UE is configured to consider other TCI states in addition to one indicated TCI state as an additionally indicated / applicable TCI state for at least one given CC / BWP, the additional indicated / applicable TCI state may be the latest or earlier indicated / applicable TCI state. It is also possible that a default TCI state may be applied as an additionally indicated / applicable TCI state.

[0071] like Figure 3A As shown, for CC 312 (i.e., CC#1) and CC 313 (CC#2) configured with a single TRP, for two TCI states indicated by reference CC 311 (i.e., CC#0) configured with multiple TRPs, i.e., TCI states #0 and #1, if CC 312 is configured to follow the first indicated TCI state in the reference CC, TCI state #0 may be applied to CC 312, and if CC 313 is configured to follow the second indicated TCI state in the reference CC, TCI state #1 may be applied to CC 313. For CC 314 (i.e., CC#3) configured with multiple TRPs, if CC 314 is configured to follow the first and second indicated TCI states, TCI state #0 and TCI state #1 may be applied to CC 314.

[0072] In some example embodiments, if a reference CC or BWP is configured with multiple TRPs, for example, by indication of at least two control resource set (CORESET) pool indices (which may be represented as CORESETPoolIndex), UE 110 determines one or more TCI states to be used for at least one given CC / BWP based on the indicated (multiple) TCI states corresponding to at least one CORESETPoolIndex.

[0073] It should be understood that the CORESETPoolIndex used below may also be replaced by a TRP ID or a physical cell ID (PCI) or a CORESET group ID or any other suitable identifier.

[0074] In some example embodiments, if at least one given CC or BWP is not configured with multiple TRPs, which means that there is no CORESETPoolIndex configured for at least one given CC or BWP or a single CORESETPoolIndex configured for at least one given CC or BWP, the UE may assume that CORESETPoolIndex#0 or the CORESETPoolIndex with the lowest index is configured for at least one given CC / BWP. Alternatively, in this case, the UE 110 may be configured with a single CORESETPoolIndex.

[0075] As an option, if the reference CC or BWP is configured with multiple TRPs and at least one given CC or BWP is configured with a single TRP, the UE 110 may determine the indicated TCI state applicable to one of at least two CORESETPoolIndex (e.g., the indicated TCI state of CORESETPoolIndex #0 or #1 applicable to the reference CC or BWP may be used for at least one given CC BWP).

[0076] As another option, if the reference CC or BWP is configured with multiple TRPs and at least one given CC or BWP is also configured with multiple TRPs, the UE 110 may determine that the corresponding indicated TCI states corresponding to at least two CORESETPoolIndex may be used for at least one given CC or BWP. For example, the indicated TCI state corresponding to CORESETPoolIndex#0 for the reference CC or BWP may be used for CORESETPoolIndex#0 of at least one given CC or BWP, and the indicated TCI state corresponding to CORESETPoolIndex#1 for the reference CC or BWP may be used for CORESETPoolIndex#1 of at least one given CC or BWP.

[0077] like Figure 3B As shown, the reference CC 321 (i.e., CC#0) is configured with multiple TRPs through CORESETPoolIndex#0 and #1, and the TCI state corresponds to each CORESETPoolIndex. For example, TCI state #0 corresponds to CORESETPoolIndex#0, and TCI state #1 corresponds to CORESETPoolIndex#1. If CC 322 (i.e., CC#1) configured with a single TRP is configured to follow the TCI state indicated for CORESETPoolIndex#0 in the reference CC 321, TCI state #0 can be applied to CC 322. If CC 323 (i.e., CC#2) configured with a single TRP is configured to follow the TCI state indicated for CORESETPoolIndex#1 in the reference CC 321, TCI state #1 can be applied to CC 323.

[0078] In some example embodiments, switching between multiple TRPs and a single TRP, including switching from multiple TRPs to a single TRP or from a single TRP to multiple TRPs, can occur dynamically for a given channel / signal / direction on a reference CC or BWP. For example, the switching can occur by configuration, indication, or even by the number of indicated / applicable (multiple) TCI states. In this case, the switching can also be configured / specified to be applied or not applied to at least one given CC / BWP.

[0079] In some example embodiments, the indication of one or two TCI states for a reference CC or BWP, and / or any of the operations presented above and below, may also include, and / or be applicable to, cross-carrier scheduling, where the reference CC or BWP is a scheduling cell and at least one given CC or BWP is a scheduled cell, or vice versa.

[0080] In this way, an efficient solution for common TCI status across CC / BWP considering multi-TRP use cases can be achieved without increasing control overhead.

[0081] Figure 4 4 is a flowchart showing an example method 400 for TCI status update for a multi-TRP use case according to some exemplary embodiments of the present disclosure. The method 400 may be implemented at the terminal device 110, such as Figure 1 For the purpose of discussion, reference will be made to Figure 1 Method 400 is described.

[0082] At 410 , the terminal device 110 obtains information from a network node about applying at least one TCI state associated with a reference CC or BWP for at least one target CC or BWP.

[0083] At 420, the terminal device determines one or more TCI states to apply to at least one target CC or BWP based on at least one of the following: information, or a TRP mode of a reference CC or BWP, or a TCI state for at least one target CC or BWP.

[0084] In some example embodiments, the reference CC or BWP, and the at least one target CC or BWP belong to the same CC or BWP set.

[0085] In some example embodiments, the information is obtained via at least one of RRC signaling, MAC-CE, or DCI.

[0086] In some example embodiments, the information is configured per CC, per CC subset, per physical channel, per RS, or per transmission direction.

[0087] In some example embodiments, if two TCI states are indicated for a reference CC or BWP and the two TCI states are applicable to at least one target CC or BWP, the terminal device may obtain the order of the two TCI states from the information and apply the two TCI states based on the order.

[0088] In some example embodiments, if two TCI states are indicated for a reference CC or BWP and only one indicated TCI state is used for at least one target CC or BWP, the terminal device may determine a target TCI state to be applied to at least one target CC or BWP based on an index or ordering of one of the two TCI states indicated in the information.

[0089] In some example embodiments, if a single TCI state is indicated for a reference CC or BWP, the terminal device may determine that the single TCI state applies to at least one target CC or BWP.

[0090] In some example embodiments, if additional TCI states are allowed to apply to at least one target CC or BWP, the terminal device may determine the additional TCI state based on at least one of the following: a latest TCI indicated state, an earlier indicated TCI state, or a default TCI state.

[0091] In some example embodiments, if a reference CC or BWP is configured with a multi-TRP mode through at least two CORESET pool indexes, the terminal device may determine that at least one TCI state corresponding to the at least two CORESET pool indexes applies to at least one target CC or BWP.

[0092] In some example embodiments, if at least one target CC or BWP is not configured with a multi-TRP mode or is configured with a single TRP mode, the terminal device may determine that a CORESET pool index is configured for at least one target CC or BWP, the CORESET pool index being a CORESET pool index having a predefined index among at least two CORESET pool indexes, or a CORESET pool index having a lowest index among at least two CORESET pool indexes.

[0093] In some example embodiments, if at least one target CC or BWP is configured with a single TRP mode, the terminal device may determine that the one or more TCI states include a TCI state corresponding to one CORESET pool index of at least two CORESET pool indexes.

[0094] In some example embodiments, if at least one target CC or BWP is configured with a multi-TRP mode, the terminal device may determine that one or more TCI states include a first TCI state and a second TCI state, the first TCI state corresponding to a first CORESET pool index among at least two CORESET pool indexes, and the second TCI state corresponding to a second CORESET pool index among at least two CORESET pool indexes.

[0095] In some example embodiments, if switching between (multiple) multi-TRP modes and a single TRP mode, or switching between two multi-TRP modes (such as between SDM and TDM, or between SDM and SFN, or simultaneous UL transmission and TDM, etc.) occurs at a reference CC or BWP, the terminal device may determine or may be configured (i.e., via RRC) that the switching is applied to or not applied to at least one target CC or BWP. The switching in the reference CC or BWP may be done based on some dynamic indications, i.e., via DCI or MAC CE and / or based on some RRC configuration and / or based on some predefined rules.

[0096] In some example embodiments, the information (defined above) may indicate that at least one TCI state associated with a reference CC or BWP is applicable for cross-carrier scheduling, and wherein the reference CC or BWP is a scheduling cell and at least one target CC or BWP is a scheduled cell.

[0097] Figure 5 1 is a flow chart showing an example method 500 for TCI status update for a multi-TRP use case according to some example embodiments of the present disclosure. The method 500 may be implemented at a network node 120, such as Figure 1 For the purpose of discussion, reference will be made to Figure 1 Method 500 is described.

[0098] At 510, the network node sends information about applying at least one TCI state associated with a reference CC or BWP for at least one target CC or BWP to a network node.

[0099] In some example embodiments, the reference CC or BWP, and the at least one target CC or BWP belong to the same CC or BWP set.

[0100] In some example embodiments, the information is sent via at least one of RRC signaling, MAC-CE, or DCI.

[0101] In some example embodiments, the information is configured per CC, per CC subset, per physical channel, per RS, or per transmission direction.

[0102] In some example embodiments, an apparatus capable of executing method 400 (for example, implemented at terminal device 110) may include: a component for executing each step of method 400. The component may be implemented in any suitable form. For example, the component may be implemented in a circuit system or a software module.

[0103] In some example embodiments, the apparatus includes a component for obtaining information from a network node that at least one TCI state associated with a reference CC or BWP is to be applied to at least one target CC or BWP; and a component for determining one or more TCI states to be applied to at least one target CC or BWP based on the information, or at least one of a TRP mode for the reference CC or BWP or a TRP mode for at least one target CC or BWP.

[0104] In some example embodiments, the reference CC or BWP, and the at least one target CC or BWP belong to the same CC or BWP set.

[0105] In some example embodiments, the means for obtaining the information may include means for obtaining the information via at least one of RRC signaling, MAC-CE, or DCI.

[0106] In some example embodiments, the information is configured per CC, per CC subset, per physical channel, per RS, or per transmission direction.

[0107] In some example embodiments, the component for determining that one or more TCI states apply to at least one target CC or BWP may include: a component for obtaining an order of two TCI states from the information based on determining that two TCI states are indicated for a reference CC or BWP and that the two TCI states are applicable to at least one target CC or BWP, and a component for applying the two TCI states based on the order.

[0108] In some example embodiments, the means for determining that one or more TCI states apply to at least one target CC or BWP may include means for determining a target TCI state applied to at least one target CC or BWP based on an index or order of one of the two TCI states indicated in the information, based on determining that two TCI states are indicated for a reference CC or BWP and only one of the indicated TCI states is applicable to at least one target CC or BWP.

[0109] In some example embodiments, means for determining that one or more TCI states apply to at least one target CC or BWP may include means for determining that a single TCI state applies to at least one target CC or BWP based on determining that a single TCI state is indicated for a reference CC or BWP.

[0110] In some example embodiments, the component for determining that one or more TCI states apply to at least one target CC or BWP may include: a component for determining an additional TCI state based on at least one of a latest TCI indication state, an earlier indicated TCI state, or a default TCI state based on determining that the additional TCI state is allowed to be used for at least one target CC or BWP.

[0111] In some example embodiments, the component for determining that one or more TCI states are applied to at least one target CC or BWP may include: a component for determining that at least one TCI state corresponding to a CORESET pool is applied to at least one target CC or BWP based on determining that a reference CC or BWP is configured with a multi-TRP mode by controlling at least two indexed CORESET pools of a resource set.

[0112] In some example embodiments, the component for determining that one or more TCI states apply to at least one target CC or BWP may include: a component for determining that a CORESET pool index is configured for at least one target CC or BW based on determining that the at least one target CC or BWP is not configured with a multi-TRP mode or is configured with a single TRP mode, the CORESET pool index being one of at least two CORESET pools of the CORESET pools with a predefined index or at least two CORESET pools of the CORESET pools with the lowest index.

[0113] In some example embodiments, the component for determining that one or more TCI states apply to at least one target CC or BWP may include: based on determining that at least one target CC or BWP is configured with a single TRP mode, determining that a TCI state corresponding to one of at least two CORESET pools applies to at least one target CC or BWP.

[0114] In some example embodiments, a component for determining that one or more TCI states are applied to at least one target CC or BWP may include: determining, based on determining that at least one target CC or BWP is configured with a multi-TRP mode, a first TCI state corresponding to a first CORESET pool of at least two CORESET pools, and a second TCI state corresponding to a second CORESET pool of at least two CORESET pools to be applied to at least one target CC or BWP.

[0115] In some example embodiments, the apparatus may further include: means for determining, based on determining that switching between the multi-TRP mode and the single TRP mode occurs at a reference CC or BWP, whether the switching applies or does not apply to at least one target CC or BWP.

[0116] In some example embodiments, the information indicates that at least one TCI state associated with a reference CC or BWP is applicable for cross-carrier scheduling, and wherein the reference CC or BWP is a scheduling cell and the at least one target CC or BWP is a scheduled cell.

[0117] In some example embodiments, an apparatus capable of performing method 500 (e.g., implemented at network node 120) may include components for performing the various steps of method 500. The components may be implemented in any suitable form. For example, the components may be implemented in a circuit system or a software module.

[0118] In some example embodiments, the apparatus includes a component for sending information to a terminal device about applying at least one TCI state associated with a reference CC or BWP for at least one target CC or BWP, the TRP mode including a single TRP mode or a multiple TRP mode, the TRP mode being applicable to at least one of: a reference CC or BWP or at least one target CC or BWP.

[0119] In some example embodiments, the reference CC or BWP, and the at least one target CC or BWP belong to the same CC or BWP set.

[0120] In some example embodiments, the means for transmitting the information may include means for transmitting the information via at least one of RRC signaling, MAC-CE, or DCI.

[0121] In some example embodiments, the information is configured per CC, per CC subset, per physical channel, per RS, or per transmission direction.

[0122] Figure 6 6 is a simplified block diagram of a device 600 suitable for implementing an example embodiment of the present disclosure. The device 600 may be provided to implement a communication device, such as Figure 1 UE 110 or gNB 120 is shown. As shown in the figure, the device 600 includes one or more processors 610, one or more memories 620 coupled to the processor 610, and one or more communication modules 640 coupled to the processor 610.

[0123] The communication module 640 is used for two-way communication. The communication module 640 has one or more communication interfaces to facilitate communication with one or more other modules or devices. The communication interface may represent any interface necessary for communication with other network elements. In some example embodiments, the communication module 640 may include at least one antenna.

[0124] Processor 610 may be of any type suitable for the local technology network and may include one or more of the following: a general purpose computer, a special purpose computer, a microprocessor, a digital signal processor (DSP), and a processor based on a multi-core processor architecture, as non-limiting examples. Device 600 may have multiple processors, such as application specific integrated circuit chips that are time slaved to a clock of a synchronized main processor.

[0125] The memory 620 may include one or more non-volatile memories and one or more volatile memories. Examples of non-volatile memories include, but are not limited to, read-only memory (ROM) 624, electrically programmable read-only memory (EPROM), flash memory, hard disks, compact disks (CDs), digital video disks (DVDs), optical disks, laser disks, and other magnetic and / or optical memories. Examples of volatile memories include, but are not limited to, random access memory (RAM) 622, and other volatile memories that do not persist during power outages.

[0126] The computer program 630 includes computer executable instructions executed by the associated processor 610. The instructions of the program 630 may include instructions for performing the operations / actions of some example embodiments of the present disclosure. The program 630 may be stored in a memory, namely ROM 624. The processor 610 may perform any suitable actions and processes by loading the program 630 into the RAM 622.

[0127] The exemplary embodiments of the present disclosure may be implemented by means of a program 630, so that the device 600 may execute the Figures 2 to 5 Any process of the present disclosure discussed. The exemplary embodiments of the present disclosure may also be implemented by hardware or by a combination of software and hardware.

[0128] In some example embodiments, the program 630 may be tangibly embodied in a computer-readable medium that may be included in the device 600 (such as in the memory 620) or in other storage devices accessible by the device 600. The device 600 may load the program 630 from the computer-readable medium to the RAM 622 for execution. In some example embodiments, the computer-readable medium may include any type of non-transitory storage medium, such as ROM, EPROM, flash memory, hard disk, CD, DVD, etc. The term "non-transitory" as used herein is a limitation of the medium itself (i.e., tangible, not a signal), not a limitation on data storage persistence (i.e., RAM versus ROM).

[0129] Figure 7 An example of a computer readable medium 700 is shown which may be in the form of a CD, DVD or other optical storage disk. The computer readable medium 700 has a program 630 stored thereon.

[0130] Generally, various embodiments of the present disclosure may be implemented in hardware or dedicated circuits, software, logic, or any combination thereof. Some aspects may be implemented in hardware, while other aspects may be implemented in firmware or software, which may be executed by a controller, microprocessor, or other computing device. Although various aspects of the embodiments of the present disclosure are shown and described as block diagrams, flow charts, or using some other graphical representations, it should be understood that the boxes, devices, systems, techniques, or methods described herein may be implemented in hardware, software, firmware, dedicated circuits or logic, general hardware, or controllers or other computing devices, or some combination thereof, as non-limiting examples.

[0131] Some example embodiments of the present disclosure also provide at least one computer program product tangibly stored in a computer-readable medium, such as a non-transient computer-readable medium. The computer program product includes computer executable instructions, such as instructions included in a program module, which are executed in a device on a target physical or virtual processor to perform any of the above methods. In general, program modules include routines, programs, libraries, objects, classes, components, data structures, etc. that perform specific tasks or implement specific abstract data types. The functions of the program modules can be combined or split between program modules as needed in various embodiments. Machine executable instructions for program modules can be executed in local or distributed devices. In distributed devices, program modules can be located in both local and remote storage media.

[0132] The program code for executing the method of the present disclosure can be written in any combination of one or more programming languages. The program code can be provided to a processor or controller of a general-purpose computer, a special-purpose computer, or other programmable data processing device so that the program code, when executed by the processor or controller, causes the functions / operations specified in the flow chart and / or block diagram to be executed. The program code can be executed entirely on the machine, partially on the machine, as an independent software package, partially on the machine, partially on a remote machine, or entirely on a remote machine or server.

[0133] In the context of the present disclosure, computer program codes or related data may be carried by any suitable carrier, so that a device, apparatus or processor can perform the above-mentioned various processes and operations. Examples of carriers include signals, computer-readable media, etc.

[0134] The computer readable medium may be a computer readable signal medium or a computer readable storage medium. The computer readable medium may include, but is not limited to, electronic, magnetic, optical, electromagnetic, infrared or semiconductor systems, devices or apparatuses, or any suitable combination of the foregoing. More specific examples of computer readable storage media may include an electrical connection with one or more wires, a portable computer floppy disk, a hard disk, a random access memory (RAM), a read-only memory (ROM), an erasable programmable read-only memory (EPROM or flash memory), an optical fiber, a portable compact disk read-only memory (CD-ROM), an optical storage device, a magnetic storage device, or any suitable combination of the foregoing.

[0135] In addition, although the operations are described in a specific order, this should not be understood as requiring the operations to be performed in the specific order shown or in a continuous order, or performing all the operations shown to achieve the desired result. In certain cases, multi-task parallel processing may be advantageous. Similarly, although the above discussion contains several specific implementation details, these details should not be interpreted as limitations on the scope of the present disclosure, but rather descriptions of features peculiar to a particular embodiment. Unless explicitly stated, certain features described in the context of a single embodiment may also be implemented in a single embodiment in combination. On the contrary, unless explicitly stated, the various features described in the context of a single embodiment may also be implemented in multiple embodiments individually or in any suitable sub-combination.

[0136] Although the present disclosure is described in language specific to structural features and / or methodological actions, it should be understood that the present disclosure defined in the appended claims is not necessarily limited to the specific features or actions described above. Instead, the specific features and actions described above are disclosed as example forms of implementing the claims.

Claims

1. A device comprising: at least one processor; as well as at least one memory storing instructions that, when executed by the at least one processor, cause the apparatus to at least: obtaining, from a network node, information about applying, for at least one target component carrier CC or bandwidth part BWP, at least one transmission configuration indicator TCI state associated with a reference CC or BWP; as well as Determining one or more TCI states to be applied to the at least one target CC or BWP based on at least one of the following: the information, or the transmission reception point TRP pattern for the reference CC or BWP, or A TRP mode for the at least one target CC or BWP. 2 . The apparatus according to claim 1 , wherein the reference CC or BWP and the at least one target CC or BWP belong to the same CC or BWP set.

3. The apparatus according to claim 1 or 2, wherein the information is obtained via at least one of the following: Radio Resource Control (RRC) signaling, or Media Access Control - Control Element MAC-CE, or Downlink Control Information DCI.

4. The apparatus according to any one of claims 1 to 3, wherein the information is provided according to at least one of the following: Each CC, or Each CC subset, or Each physical channel, or Each reference signal, or Each transmission direction.

5. The apparatus according to any one of claims 1 to 4, wherein the at least one TCI state comprises two TCI states indicated for the reference CC or BWP, and the information comprises an order of the two TCI states, and wherein the apparatus is further caused to: determining that the two TCI states are applicable to the at least one target CC or BWP; and Based on the determining, it is determined that the one or more TCI states include the two TCI states, wherein the two TCI states are to be applied based on the order.

6. The apparatus according to any one of claims 1 to 4, wherein the at least one TCI state comprises two TCI states indicated for the reference CC or BWP, and the information comprises an index or ranking of one of the two states, and wherein the apparatus is further caused to: determining that the TCI selected from the two TCI states is applicable to the at least one target CC or BWP; and Based on the determining, determining the one or more TCI states includes the TCI state, wherein the TCI state is selected based on the index or the ranking.

7. The apparatus of any one of claims 1 to 4, wherein the at least one TCI state comprises a single TCI state, and wherein the apparatus is further caused to: Determining the one or more TCI states includes the single TCI state.

8. The apparatus of claim 6, wherein an additional TCI state is applicable to the at least one target CC or BWP, and wherein the apparatus is further caused to: Determining the one or more TCI states includes the additional TCI state, wherein the additional TCI state is based on at least one of: The most recently indicated TCI status, or TCI status indicated earlier, or The default TCI state.

9. The apparatus according to any one of claims 1 to 4, wherein the reference CC or BWP is configured with a multi-TRP mode by at least two control resource sets CPRESET pool indexes, and wherein the apparatus is further caused to: Determining the one or more TCI states includes at least one TCI state corresponding to the at least two CORESET pool indexes, the at least one TCI state being applied to the at least one target CC or BWP.

10. The apparatus of claim 9, wherein at least one target CC or BWP is not configured with a multi-TRP mode or is configured with a single TRP mode, wherein the apparatus is further caused to: Determining that a CORESET pool index is configured for the at least one target CC or BWP, the CORESET pool index being one of: a CORESET pool index having a predefined index among the at least two CORESET pool indexes, or The CORESET pool index having the lowest index among the at least two CORESET pool indexes.

11. The apparatus of claim 9, wherein the at least one target CC or BWP is configured with a single TRP mode, and wherein the apparatus is further caused to: Determining the one or more TCI states includes a TCI state corresponding to one of at least two CORESET pool indexes.

12. The apparatus according to claim 9, wherein the at least one target CC or BWP is configured with a multi-TRP mode, wherein the apparatus is further caused to: Determining the one or more TCI states includes a first TCI state and a second TCI state, wherein the first TCI state corresponds to a first CORESET pool index among the at least two CORESET pool indexes, and the second TCI state corresponds to a second CORESET pool index among the at least two CORESET pool indexes.

13. The device according to any one of claims 1 to 12, wherein the device is further configured to: It is determined that switching between the multi-TRP mode and the single TRP mode occurs at the reference CC or BWP, and it is determined that the switching is applied or not applied to the at least one target CC or BWP.

14. The apparatus according to any one of claims 1 to 12, wherein the information indicates that the at least one TCI state associated with the reference CC or BWP is applicable to cross-carrier scheduling, and wherein the reference CC or BWP is a scheduling cell and the at least one target CC or BWP is a scheduled cell.

15. The apparatus according to any one of claims 1 to 14, wherein the apparatus comprises a terminal device.

16. An apparatus comprising: at least one processor; as well as at least one memory storing instructions that, when executed by the at least one processor, cause the apparatus to at least: Information about applying at least one transmission configuration indicator (TCI) state associated with a reference CC or BWP for at least one target component carrier (CC) or bandwidth part (BWP) is sent to the terminal device. 17 . The apparatus of claim 16 , wherein the reference CC or BWP and the at least one target CC or BWP belong to the same CC or BWP set.

18. The apparatus of claim 16 or 17, wherein the information is sent via at least one of: Radio Resource Control (RRC) signaling, or Media Access Control - Control Element MAC-CE, or Downlink Control Information DCI.

19. The apparatus according to any one of claims 16 to 18, wherein the information is provided according to at least one of the following: Each CC, or Each CC subset, or Each physical channel, or Each reference signal, or Each transmission direction.

20. An apparatus according to any one of claims 16 to 19, wherein the apparatus comprises a network node.

21. A method comprising: obtaining, at the terminal device, from a network node, information about applying, for at least one target component carrier CC or bandwidth part BWP, at least one transmission configuration indicator TCI state associated with a reference CC or BWP; as well as Determining one or more TCI states to be applied to the at least one target CC or BWP based on at least one of the following: the information, or the transmission reception point TRP pattern for the reference CC or BWP, or A TRP mode for the at least one target CC or BWP.

22. A method comprising: Information about applying at least one transmission configuration indicator (TCI) state associated with a reference CC or BWP for at least one target component carrier (CC) or bandwidth part (BWP) is sent from the network node to the terminal device.

23. An apparatus comprising: means for obtaining from a network node information about applying at least one transmission configuration indicator TCI state associated with a reference CC or BWP for at least one target component carrier CC or bandwidth part BWP; as well as Means for determining one or more TCI states to apply to the at least one target CC or BWP based on at least one of: the information, or the transmission reception point TRP pattern for the reference CC or BWP, or A TRP mode for the at least one target CC or BWP.

24. An apparatus comprising: Means for sending information to a terminal device regarding application of at least one transmission configuration indicator (TCI) state associated with a reference CC or BWP for at least one target component carrier (CC) or bandwidth part (BWP).

25. A computer-readable medium comprising instructions, which, when executed by a device, cause the device to at least perform the method according to claim 21 or the method according to claim 22.

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