Methods and apparatuses for adaptation of channel parameter tracking in 5g NR systems

Abstract

A method performed by a wireless device or a UE incudes receiving from a network node, a configuration and / or an indication of a channel state information reference signal, CSI-RS, or Tracking Reference Signal, TRS, resource The method further comprises receiving a configuration and / or an indication and / or a scheduling of a downlink, DL, channel or a reference signal, RS, transmission for which a source RS for Quasi-Co-Located, QCL, assumption(s) in said CSI-RS or TRS resource, or a configuration and / or an indication and / or a scheduling of an uplink, UL, channel or RS transmission, wherein a reference for computing or estimating a pathloss for calculation of an UL transmit, Tx, power is said CSI-RS or TRS resource. The method further comprises receiving a physical, PHY layer signaling, or a medium access control, MAC, layer signaling, or a higher layer signaling for updating or for leading to an update of one or more transmission configuration indication, TCI-State(s) or an update of QCL assumption(s) of said CSI-RS or TRS resource. The method further comprises applying said update of said QCL assumption(s) or TCI-State(s) to said CSI-RS or TRS resource or resource(s) in said CSI-RS or TRS resource set, and determining or obtaining value(s) of at least one of the following from said CSI-RS or TRS resource. The method further comprises applying at least one of said determined or obtained values after the application of said QCL assumption(s) or TCI-State(s) to said CSI-RS or TRS resource.

Description

[0001] Methods and Apparatuses for Adaptation of Channel Parameter Tracking in 5G NR Systems

[0002] TECHNICAL FIELD

[0003] The present disclosure relates to the field of wireless telecommunications, and particularly to methods and apparatuses for dynamic switching of reference signals used for tracking in the downlink of a radio communication network and the adaptation of the tracking process for various parameters measured or computed from such reference signals.

[0004] BACKGROUND

[0005] The radio access technology (RAT) in fifth generation (5G) mobile communications system, also known as 5G new radio (NR), provides a higher level of performance and flexibility than the previous generations of mobile communications systems. 5G mobile communications has been driven by the need to provide ubiquitous connectivity for applications as diverse automotive communication, remote control with feedback, video downloads, as well as data applications for Internet-of-Things (loT) devices, machine type communication (MTC) devices, etc. 5G wireless technology brings several main benefits, such as faster speed, shorter delays and increased connectivity. The third-generation partnership project (3GPP) provides the complete system specification for the 5G network architecture, which includes at least a radio access network (RAN), core transport networks (CN) and service capabilities.

[0006] Figure 1 illustrates a simplified schematic view of an example of a wireless communications network 100 including a core network (CN) 110 and a radio access network (RAN) 120. The RAN 120 is shown including a plurality of network nodes or radio base stations, which in 5G are called gNBs. Three radio base stations are depicted gNB1 , gNB2 and gNB3. Each gNB serves an area called a coverage area or a cell. Figure 1 illustrates 3 cells 121 , 122 and 123, each served by its own gNB, gNB1 , gNB2 and gNB3, respectively. It should be mentioned that the network 100 may include any number of cells and gNBs. The radio base stations, or network nodes serve users within a cell. In 4G or LTE, a radio base station is called an eNB, in 3G or UMTS, a radio base station is called an eNodeB, and BS in other radio access technologies. A user or a user equipment (UE) may be a wireless or a mobile terminal device or a stationary communication device. A mobile terminal device or a UE may also be an loT device, an MTC device, etc. loT devices may include wireless sensors, software, actuators, and computer devices. They can be imbedded into mobile devices, motor vehicle, industrial equipment, environmental sensors, medical devices, aerial vehicles and more, as well as network connectivity that enables these devices to collect and exchange data across an existing network infrastructure.

[0007] Referring back to Figure 1 , each cell is shown including UEs and loT devices. gNB1 in cell 121 serves UE1 121 A, UE2 121 B and loT device 121C. Similarly, gNB2 in cell 121 serves UE3 122A, UE4 122B and loT device 122C, and gNB3 in cell 123 serves UE5 123A, UE6 123B and loT device 123C. The network 100 may include any number of UEs and loT devices or any other types of devices. The devices communicate with the serving gNB(s) in the uplink and the gNB(s) communicate with the devices in the downlink. The respective base station gNB1 to gNB3 may be connected to the CN 120, e.g., via the S1 interface, via respective backhaul links 111 , 121 D, 122D, 123D, which are schematically depicted in Fig. 1 by the arrows pointing to “core”. The core network 120 may be connected to one or more external networks, such as the Internet. The gNBs may be connected to each other via the S1 interface or the X2 interface or the XN interface in 5G, via respective interface links 121 E, 122E and 123E, which is depicted in the figure by the arrows pointing to gNBs.

[0008] For data transmission, a physical resource grid may be used. The physical resource grid may comprise a set of resource elements (REs) to which various physical channels and physical signals are mapped. For example, the physical channels may include the physical downlink, uplink and / or sidelink (SL) shared channels (PDSCH, PUSCH, PSSCH) carrying user specific data, also referred to as downlink, uplink or sidelink payload data, the physical broadcast channel (PBCH) carrying for example a master information block (MIB) and a system information block (SIB), the physical downlink, uplink and / or sidelink control channels (PDCCH, PUCCH, PSCCH) carrying for example the downlink control information (DCI), the uplink control information (UCI) or the sidelink control information (SCI). For the uplink, the physical channels may further include the physical random-access channel (PRACH or RACH) used by UEs for accessing the network once a UE is synchronized and obtains the MIB and SIB. The physical signals may comprise reference signals (RS), synchronization signals (SSs) and the like. The resource grid may comprise a frame or radio frame having a certain duration, like 10 milliseconds, in the time domain and having a given bandwidth in the frequency domain. The radio frame may have a certain number of subframes of a predefined length, e.g., 2 subframes with a length of 1 millisecond. Each subframe may include one or more slots of a number of OFDM symbols depending on the cyclic prefix (CP) length. In 5G, each slot consists of 14 OFDM symbols or 12 OFDM symbols based on normal CP and extended CP respectively. A frame may also consist of a smaller number of OFDM symbols, e.g., when utilizing shortened transmission time intervals (TTIs) or a mini-slot / non-slot-based frame structure comprising just a few OFDM symbols. Slot aggregation is supported in 5G NR and hence data transmission can be scheduled to span one or multiple slots. Slot format indication informs a UE whether an OFDM symbol is downlink, uplink or flexible / special.

[0009] The wireless communication network system may be any single-tone or multicarrier system using frequency-division multiplexing, like the orthogonal frequency-division multiplexing (OFDM) system, the orthogonal frequency-division multiple access (OFDMA) system, or any other Discrete Fourier Transform (DFT) based signal with or without CP, e.g., DFT-spread OFDM (DFT-s-OFDM). Other waveforms, like non-orthogonal waveforms for multiple access, e.g., filter-bank multicarrir (FBMC), generalized frequency division multiplexing (GFDM) or universal filtered multi carrier (LIFMC), may also be used. The wireless communication system may operate, e.g., in accordance with the LTE-Advanced Pro standard, the 5G or NR (New Radio) standard or any other standard using any of the aforementioned waveforms.

[0010] The wireless communications network system depicted in Figure 1 may be a heterogeneous network having two distinct overlaid networks, a network of macro cells with each macro cell including a macro base station, like base station gNB1 to gNB3, and a network of small cell base stations (not shown in Figure 1), like femto- or pico-base stations. In addition to the above described wireless network also non-terrestrial wireless communication networks exist including spaceborne transceivers, like satellites, and / or airborne transceivers, like unmanned aircraft systems. The non-terrestrial wireless communication network or system may operate in a similar way as the terrestrial system described above with reference to Figure 1 , for example in accordance with the LTE-advanced pro standard or the 5G or NR, standard.

[0011] In the wireless communications network system such as the one depicted schematically in Figure 1 , multi-antenna techniques may be used, e.g., in accordance with LTE, NR or any other communication system, to improve user data rates, link reliability, cell coverage and network capacity. To support multi-stream or multi-layer transmissions, linear precoding is used in the physical layer of the communication system. Linear precoding is performed by a precoder matrix which maps layers of data to antenna ports. The precoding may be seen as a generalization of beamforming, which is a technique to spatially direct or focus a data transmission towards an intended receiver. The precoder matrix to be used at the gNB to map the data to the transmit antenna ports is decided using channel state information, CSI.

[0012] In the wireless communications network system as described above, such as LTE or New Radio (5G), various physical channels are defined for the communication of data payload and control information. In addition, various reference signals are also designed for purposes such as link adaptation and management, demodulation, frame synchronization, cell search, phase tracking, among others. A gNodeB (or gNB or base station) transmits to one or more users in the downlink. A user equipment (UE) or mobile terminal transmits to one or more base stations in the uplink. In the sidelink, two or more user equipments may be involved in communication. The data payload is transmitted via the physical downlink shared channel (PDSCH) in the downlink (DL), via the physical uplink shared channel (PLISCH) in the uplink (UL) and via the physical sidelink shared channel (PSSCH) in the sidelink (SL), of a wireless network. The control information is typically transmitted via the physical downlink control channel (PDCCH) in the downlink (DL), via the physical uplink control channel (PLICCH) in the uplink (UL) and via the physical sidelink control channel (PSCCH) in the sidelink (SL), of a wireless network. The physical broadcast channel (PBCH) is transmitted along with the synchronization signals (SS) in the downlink as a SS / PBCH block to aid in cell search and downlink synchronization. The physical sidelink broadcast channel (PSBCH) in the sidelink is similar in structure and functionality to the PBCH. The physical random access channel (PRACH) in the uplink is characterized by the PRACH preamble and is used for uplink synchronization. The PDSCH, PDCCH, PBCH, PUSCH, PUCCH, PSSCH, PSCCH and PSBCH are provided with DeModulation Reference Signals (DMRS) for coherent demodulation of the channel. The number of DMRS antenna ports during a given instance of transmission of the channel is equal to the number of layers transmitted. A layer of the transmission of a channel can be referred to using the DMRS port associated with it.

[0013] The transmission of the channel state information reference signals (CSI-RS) in the DL by the network plays a crucial role in initiating, maintaining, adapting, and recovering communication links. The following tasks are few among their uses in a wireless network: estimation of the DL channel for adaptation of link parameters such a spatial precoder, modulation order and coding scheme, measurement and reporting of suitable spatial beam(s) for communication, tracking of various parameters required for communication such as average delay, delay spread, Doppler shift / spread, DL pathloss, etc. and recovering a link after its “failure”. In this invention disclosure, issues related to channel parameter tracking from DL RSs are addressed. Various proposals for dynamic switching of DL tracking reference signals and the maneuvers that follow for adapting the tracking process of the tracked parameters are provided in this invention disclosure.

[0014] In millimeter wave (mmWave) frequencies (frequency range 2 (FR2)), i.e., frequencies above 6 GHz, in general, wireless communication between communication devices is performed with spatially selective / directive transmissions and receptions called beams. The term ‘beam’ is used in the following to denote a spatially selective / directive transmission of an outgoing signal or reception of an incoming signal which is achieved by precoding / filtering the signal at the antenna ports of the device with a set of coefficients. The word precoding or filtering may refer to processing of the signal in the analog or digital domain. The set of coefficients used to spatially direct a transmission / reception in a certain direction may differ from one direction to another direction. The term ‘Tx beam’ denotes a spatially selective / directive transmission and the term ‘Rx beam’ denotes a spatially selective / directive reception. The set of coefficients used to precode / filter the transmission or reception is denoted by the term ‘spatial filter’. The term ‘spatial filter’ is used interchangeably with the term ‘beam direction’ in this document as the spatial filter coefficients determine the direction in which a transmission / reception is spatially directed to.

[0015] The term ‘higher layer’ in the following, when used in isolation, denotes any communication layer above the physical layer in the protocol stack.

[0016] The term serving cell and carrier component (CC) may be used interchangeably in this disclosure as a serving cell configured for a UE and is usually a separate physical carrier with a certain carrier frequency. Depending on the frequency of a component carrier / serving cell, the size of the cell and the beamformed reference signals may vary. Each serving cell or component carrier comprises / VBWP> 1 bandwidth parts (BWP) which is a set of frequency domain resources. At any given time instant in a serving cell, the UE may receive physical layer transmissions from a TRP or any other network element in one of the configured BWPs in the DL in the cell and may perform transmissions in one of the configured BWPs in the UL in the cell.

[0017] It is to be noted that any mention of an action performed by a network node such as a gNodeB (gNB) can also be performed by any other element of the network and hence any concerned statement shall be read as such.

[0018] SUMMARY

[0019] It is an objective of the embodiments herein to provide methods and apparatuses for reference signal enhancements for channel parameter tracking in a wireless communications network such as advanced 5G networks.

[0020] According to an aspect of some embodiments herein, there is provided a method performed by a wireless device or a UE, the method comprising:

[0021] • receiving from a network node, o a configuration and / or an indication of a Channel State Information reference signal, CSI-RS, or Tracking Reference Signal, TRS, resource, o a configuration and / or an indication and / or a scheduling of a downlink, DL, channel or a reference signal, RS, transmission for which a source RS for Quasi-Co- Located, QCL, assumption(s) in said CSI-RS or TRS resource, or a configuration and / or an indication and / or a scheduling of an uplink, UL, channel or RS transmission, wherein a reference for computing or estimating a pathloss for calculation of an UL transmit, Tx, power is said CSI-RS or TRS resource, and o a physical, PHY layer signaling, or a medium access control, MAC, layer signaling, or a higher layer signaling for updating or for leading to an update of one or more transmission configuration indication, TCI-State(s) or an update of QCL assumption(s) of said CSI-RS or TRS resource; the method further comprising:

[0022] • applying said update of said QCL assumption(s) or TCI-State(s) to said CSI-RS or TRS resource, at a predetermined or a specified time instant after reception of said signaling,

[0023] • determining or obtaining value(s) of at least one of the following from said CSI-RS or TRS resource up to, at or before an application of said QCL assumption(s) or TCI- State(s): o channel parameter(s) corresponding to said QCL assumption(s) associated with said at least one DL channel or RS, and o one or more pathloss estimate(s), and

[0024] • using or applying at least one of said determined or obtained values after the application of said QCL assumption(s) or TCI-State(s) to said CSI-RS or TRS resource for a specified or predetermined time duration ga, at least for one of the following purposes: o a reception of (port(s) of) said DL channel or RS, or o a determination of a transmit, Tx, power for a transmission of said UL channel or RS.

[0025] According to another aspect of some embodiments herein, there is provided a method performed by a wireless device or a UE, the method comprising: receiving from a network node,

[0026] ■ a configuration and / or an indication of a CSI-RS or TRS resource,

[0027] ■ a configuration and / or an indication and / or a scheduling of a downlink, DL, channel or a reference signal, RS, transmission for which a source RS for Quasi- Co-Located, QCL, assumption(s) in said CSI-RS or TRS resource, or a configuration and / or an indication and / or a scheduling of an uplink, UL, channel or RS transmission, wherein a reference for computing or estimating a pathloss for calculation of an UL transmit, Tx, power is said CSI-RS or TRS resource,

[0028] ■ a first physical layer, PHY-, signaling, or a first MAC signaling or a first higher layer signaling for deactivating said CSI-RS or TRS resource, and

[0029] ■ an indication along with said first signaling or via a different signaling that activates or reactivates said CSI-RS or TRS resource; determining or obtaining value(s) of at least one of the following from said CSI-RS or TRS resource up to, at or before its deactivation: o one or more channel parameter(s) at least corresponding to the QCL assumption(s) associated with said at least one DL channel or RS, o pathloss estimate(s), and using or applying at least one of said determined or obtained value(s) after the deactivation of said CSI-RS or TRS resource for a specified or predetermined time duration ga, at least for one of the following purposes: o the reception of (port(s) of) said DL channel or RS, or o the determination of the Tx power for the transmission of said UL channel or RS.

[0030] According to yet another aspect of some embodiments herein, there is provided a method performed by a wireless device or a UE, the method comprising:

[0031] • receiving from a network node: o a configuration and / or indication indicating a first CSI-RS or TRS resource and a second CSI-RS or TRS resource, and wherein both first and second CSI-RS or TRS resource are configured for tracking with periodic or semi-persistent timedomain behavior, o a configuration, indication and / or scheduling of a DL channel or RS transmission for which the source RS for the QCL assumption(s) is said CSI-RS or TRS resource, or a configuration, indication and / or scheduling of an UL channel or RS transmission, wherein the reference to compute or estimate the pathloss for calculation of an UL Tx power is said first CSI-RS or TRS resource, o a first PHY-, MAC or a higher layer signaling that deactivates said first CSI-RS or TRS resource, and o an indication along with said first signaling or via a different signaling that activates said second CSI-RS or TRS resource; and

[0032] • updating o at least one QCL assumption for the reception of said DL channel or RS, or o a pathloss reference for said UL channel or RS, wherein the update is performed after the signalling that activates said second CSI-RS or TRS resource.

[0033] According to yet another aspect of some embodiments herein, there is provided a method performed by a network node the method comprising:

[0034] - transmitting to a wireless device or a User Equipment, UE:

[0035] ■ a configuration and / or indication of a CSI-RS or TRS resource,

[0036] ■ a configuration, indication and / or scheduling of a DL channel (e.g., PDSCH or PDCCH) or RS (e.g., CSI-RS) transmission for which the source RS for the QCL assumption(s) is said CSI-RS or TRS resource, or a configuration, indication and / or scheduling of an UL channel (e.g., PUSCH or PUCCH) or RS (e.g., SRS) transmission, wherein the reference to compute or estimate the pathloss for calculation of an UL Tx power is said CSI-RS or TRS resource, and

[0037] ■ a PHY-, MAC or a higher layer signaling that update or leads to an update of the TCI-State(s) or QCL assumption(s) of said CSI-RS or TRS resource; for enabling the UE to apply said update of QCL assumption(s) or TCI-State(s) to said CSI-RS or TRS resource , at a predetermined or specified time instant after reception of said signaling, and determine or obtain value(s) of at least one of the following from said CSI-RS or TRS resource up to, at or before the application of said QCL assumption(s) or TCI-State(s): o channel parameter(s) at least corresponding to the QCL assumption(s) associated with said at least one DL channel or RS, o pathloss estimate(s), and use at least one of said determined or obtained values after the application of said QCL assumption(s) or TCI-State(s) to said CSI-RS or TRS resource for a specified or predetermined time duration ga, at least for one of the following purposes: o the reception of (port(s) of) said DL channel or RS, or o the determination of the transmit, Tx, power for the transmission of said UL channel or RS. According to yet another aspect of some embodiments herein, there is provided a method performed by a network node, the method comprising: transmitting to a user equipment, a configuration and / or indication of a CSI-RS or TRS resource, a configuration, indication and / or scheduling of a DL channel (e.g., PDSCH or PDCCH) or RS (e.g., CSI-RS) transmission for which the source RS for the QCL assumption(s) is said CSI-RS or TRS resource, or a configuration, indication and / or scheduling of an UL channel (e.g., PLISCH or PLICCH) or RS (e.g., SRS) transmission, wherein the reference to compute or estimate the pathloss for calculation of an UL Tx power is said CSI-RS or TRS resource, a first PHY-, MAC or a higher layer signaling that deactivates said CSI-RS or TRS resource, and an indication along with said first signaling or via a different signaling that activates / reactivates said CSI-RS or TRS resource; for enabling the UE to determine or obtain value(s) of at least one of the following from said CSI-RS or TRS resource up to, at or before its deactivation: o channel parameter(s) at least corresponding to the QCL assumption(s) associated with said at least one DL channel or RS, o pathloss estimate(s), and use at least one of said determined or obtained value(s) after the deactivation of said CSI-RS or TRS resource for a specified or predetermined time duration ga, at least for one of the following purposes: o the reception of (port(s) of) said DL channel or RS, or o the determination of the Tx power for the transmission of said UL channel or RS.

[0038] According to yet another aspect of some embodiments herein, there is provided a method performed by a network node the method comprising: transmitting to a user equipment, or a wireless device:

[0039] • a configuration and / or indication indicating a first CSI-RS or TRS resource and a second CSI-RS or TRS resource, and wherein both first and second CSI-RS or TRS resource are configured for tracking with periodic or semi-persistent time-domain behavior, • a configuration, indication and / or scheduling of a DL channel or RS transmission for which the source RS for the QCL assumption(s) is said CSI-RS or TRS resource, or a configuration, indication and / or scheduling of an UL channel or RS transmission, wherein the reference to compute or estimate the pathloss for calculation of an UL Tx power is said first CSI-RS or TRS resource,

[0040] • a first PHY-, MAC or a higher layer signaling that deactivates said first CSI-RS or TRS resource, and

[0041] • an indication along with said first signaling or via a different signaling that activates said second CSI-RS or TRS resource; for enabling the UE to update

[0042] • at least one QCL assumption for the reception of said DL channel or RS, or

[0043] • a pathloss reference for said UL channel or RS, wherein the update is performed after the signaling that activates said second CSI-RS or TRS resource.

[0044] There is also provided a wireless device or a UE configured to perform the method according to some embodiments.

[0045] There is also provided a network node configured to perform the method according to some embodiments.

[0046] There is also provided a computer program comprising instructions which when executed on at least one processor of the U E, cause the at least said one processor to carry out the actions or method steps presented herein.

[0047] There is also provided a computer program comprising instructions which when executed on at least one processor of the network node, cause the at least said one processor to carry out the method steps presented herein.

[0048] A carrier is also provided containing the computer program, wherein the carrier is one of a computer readable storage medium, an electronic signal, optical signal, or a radio signal.

[0049] An advantage of the embodiments herein is to reduce the latency with which reference signals fortracking and the corresponding parameter tracking at the UE currently adapt to UE mobility. An understanding of the adaptations for the tracking reference signal transmissions and the tracking process between the network and the UE are necessary for accurate channel parameter tracking and reliable DL and UL transmissions.

[0050] Additional advantages of the embodiments herein are provided in the detailed description of this disclosure.

[0051] BRIEF DESCRIPTION OF THE DRAWINGS

[0052] Embodiments of the present invention are now described in further detail with reference to the accompanying drawings, in which:

[0053] Fig. 1 shows a schematic representation of a wireless communications system;

[0054] Fig. 2 illustrates an example of the possible QCL types indicated / assumed for the RSs used for tracking by some embodiments herein;

[0055] Fig. 3 illustrates an example timeline of the adaptation of the QCL assumptions for tracking reference signals and the corresponding UE behavior according to some embodiments herein;

[0056] Fig. 4 illustrates a flowchart of a method performed by a wireless device (or UE) according to some embodiments herein;

[0057] Fig. 5 illustrates a flowchart of a method performed by a wireless device (or UE) according to some embodiments herein;

[0058] Fig. 6 illustrates a flowchart of a method performed by a wireless device (or UE) according to some embodiments herein;

[0059] Fig. 7 illustrates a flowchart of a method performed by a network node according to some embodiments herein;

[0060] Fig. 8 illustrates a flowchart of a method performed by a network node according to some embodiments herein;

[0061] Fig. 9 illustrates a flowchart of a method performed by a network node according to some embodiments herein;

[0062] Fig. 10 illustrates a schematic of a wireless device (such as a user equipment);

[0063] Fig. 11 illustrates a schematic of a network node; DETAILED DESCRIPTION

[0064] In the following, a detailed description of the exemplary embodiments is described in conjunction with the drawings, in several scenarios to enable easier understanding of the solution(s) described herein.

[0065] In certain embodiments, the wireless device, or user equipment, UE, is configured to receive from a network node a configuration of one or more Transmission Configuration Indication - State(s), TCI-state(s). In another embodiment, the UE is configured with a configuration of one or more TCI-state(s) via a known rule, e.g., the rule is described in the NR standards. The configuration of a TCI-state comprises at least one of the following:

[0066] 1. one or more reference signals and one or more quasi-colocation, QCL, assumption or setting type per reference signal,

[0067] 2. one or more reference signals, RSs, to be used a pathloss reference (the pathloss estimate computed from said RS(s) is used to compute Tx power for UL channels or RSs),

[0068] 3. one or more transmit power settings.

[0069] Depending on the indicated setting(s), the TCI-State is a DL TCI-State, an UL TCI-State or a joint TCI-State. A TCI-State is a DL TCI-State if the configuration comprises reception settings - one of more reference signals and one or more QCL assumption or setting type for each reference signal. A DL TCI state does not comprise the second and third settings mentioned above. The setting(s) in a DL TCI-State are applied by the UE to DL channels or RSs (the setting(s) in a DL TCI-State are applied for the reception of DL channels or RSs). A TCI-State is an UL TCI-State if the configuration comprises transmission settings, i.e. , the second and / or third setting(s) mentioned above. An UL TCI state does not comprise the first setting(s). The setting(s) in an UL TCI-State are applied by the UE to UL channels or RSs (setting(s) in an UL TCI-State are applied for the transmission of UL channels or RSs). A TCI-State is a joint TCI-State if the configuration comprises the first setting and, second and / or third setting(s). The setting(s) in a joint TCI-State can be applied by the UE to both UL and DL channels / RSs.

[0070] In certain embodiments, the UE is configured to apply one or more DL TCI-State(s), i.e., the reception setting(s) that are provided in the one or more TCI-State(s), for the reception of a DL reference signal or DL channel (e.g., the Physical Downlink Shared Channel, PDSCH, or the Physical Downlink Control Channel, PDCCH). The phrase “application of a TCI-State to a DL reference signal or channel” by the UE has the same meaning as “application of the QCL assumption(s) or setting(s) provided in the TCI- State for the reception of said DL reference signal or channel.”

[0071] Two antenna ports are said to be quasi co-located (QCL-ed) if the large-scale properties of the channel over which a symbol on one antenna port is conveyed can be inferred from the channel over which a symbol on the other antenna port is conveyed. The large-scale properties include one or more of delay spread, Doppler spread, Doppler shift, average gain, average delay, and spatial Rx parameters.

[0072] The QCL assumption(s) are performed / applied between ports of two different reference signals, or between ports of a reference signal and (DeModulation Reference Signal) ports of a physical channel, such as the Physical Downlink Control Channel or the Physical Downlink Shared Channel. The UE may infer one or more large scale channel properties of a channel or reference signal from that / those reference signal which provides the QCL, i.e. , the source RS for QCL.

[0073] The phrase “A DL / SL channel or RS ‘A’ (or the respective port(s)) is QCL-ed, or assumed to be QCL-ed, with an RS ‘b’ (or the respective port(s)) in terms of ‘Doppler shift’ and ‘delay spread’,” implies that said parameters (or channel parameters) for the reception, demodulation, decoding or processing of (said port(s) of) DL / SL channel or RS ‘A’ can be determined, inferred or derived from (the channel corresponding to / the channel corresponding to the port(s) of) RS ‘b’. Here, (port(s) of) RS 'b' is referred to as the QCL source, or source RS, that provides the reference for the measurement of said channel parameters or simply parameters. The (port(s) of the) DL / SL channel or RS 'A' is the target.

[0074] Four different QCL types are defined in the current NR standards to indicate with respect to which parameters QCL assumption(s) is / are to be performed / applied:

[0075] Type A: {Doppler shift, Doppler spread, average delay, delay spread}

[0076] Type B: {Doppler shift, Doppler spread}

[0077] Type C: {Doppler shift, average delay}

[0078] Type D: {Spatial Rx parameter}

[0079] A channel or RS ‘X’ that is QCL-ed, or assumed to be QCL-ed, with a DL RS resource ‘b’ with respect to QCL type ‘A’ implies that the Doppler shift, Doppler spread, average delay, and delay spread for said channel (or the DM RS ports of said channel) or RS ‘X’ can be obtained or derived from (the channel corresponding to) DL RS resource ‘b’. A channel or RS ‘X’ that is QCL-ed, or assumed to be QCL-ed, with a DL RS resource ‘b’ with respect to QCL type ‘D’ implies that the channel (or the DMRS ports of said channel) or RS ‘X’ and DL RS resource ‘b’ can be received by the UE with the same spatial receive filter. QCL type ‘D’ is typically applicable to UEs that are capable of receive, Rx, beamforming (for instance, a UE implementing a hybrid or analog beamforming network).

[0080] A TCI state comprises one or more CSI-RS or SSB resources as source RS(s) along with the QCL assumption(s) for each source RS. The RS in the TCI-state is usually a RS that the UE has measured before, so that it can use it as a reference to receive the (port(s) of) target signal or target channel. An RS provided in a TCI-State along with a QCL assumption type can be called as a source RS for QCL.

[0081] A TCI-State comprises at least the following: a RS ‘rT with QCL type ‘XT, and / or a RS ‘r2’ with QCL type ‘X2’, wherein ‘XT, ‘X2’ can be one of ‘A’, ‘B’, ‘C’ or ‘D’. The application of the TCI-State to a DL channel or RS means that the UE performs the QCL assumption(s) as provided in the TCI- State, i.e. , the UE assumes that said DL channel or RS is QCL-ed,

[0082] - with RS ‘rT with respect to QCL type ‘XT, if RS ‘rT with QCL type ‘XT is provided in the TCI-State,

[0083] - with RS ‘r2’ with respect to QCL type ‘X2’, if RS ‘r2’ with QCL type ‘X2’ is provided in the TCI -State.

[0084] In certain embodiments, the RS ‘rT and ‘r2’ can be a CSI-RS (e.g., a NZP CSI-RS resource) or a SSB.

[0085] Similarly, the application / performing of a QCL assumption to a DL channel or RS denotes an assumption that said DL channel or RS is QCL-ed with an indicated / specified RS T with respect to an indicated / specified / predetermined QCL type ‘X’ (where ‘X’ can be one of ‘A’, ‘B’, ‘C’ or ‘D’).

[0086] This can also be termed as performing a QCL association. In the above examples, the RS T can be a CSI-RS (e.g., a NZP CSI-RS resource) or a SSB.

[0087] In some examples, the TCI-State (a joint or UL TCI-State) may comprise a RS as a reference for the computation, estimation or calculation of a pathloss estimate by the UE and / or power control setting(s) or variable(s) used to compute an UL transmit, Tx, power. The application of the TCI-State to a UL channel or RS means that, the UE uses the RS provided in the TCI-State as a reference for the determination of a pathloss estimate, which is used for the calculation of an UL Tx power for the transmission of said UL channel or RS, and / or the UE uses the power control setting(s) provided in the TCI-State for the calculation of an UL Tx power for the transmission of said UL channel or RS.

[0088] In certain embodiments, the RS indicated as a reference for the computation of a pathloss estimate can be a CSI-RS (e.g., a CSI-RS resource or a NZP CSI-RS resource) or an SSB.

[0089] In certain embodiments, the UE is configured to receive a configuration of one or more DL RS resources for tracking, wherein the one or more DL RS resources are provided in one or more resource sets. In some examples, the network indicates that the resource(s) is / are used by the UE for tracking. In some examples, the configuration for the resources comprises a parameter ‘trs-lnfo’ that indicates that the associated resource(s) is / are for tracking.

[0090] In certain cases, ‘tracking’ may refer to the usage of the RS resource(s) by the UE for the determination, measurement or estimation of time / frequency parameters related to the channel. It may also refer to the determination, measurement or estimation of one or more large-scale channel properties or parameters (or referred to as ‘channel parameters’ in some cases in this disclosure). Such determination, measurement or estimation may be performed over one or more transmission occasions of said RS resource(s).

[0091] In some examples, the resource(s) configured for tracking are non-zero-power (NZP) CSI-RS resource(s).

[0092] In certain embodiments, the UE is configured to receive a configuration of resource(s) for tracking in one or more resource set(s). A resource set may be provided either by the higher layer parameter ‘NZP-CSI-RS-ResourceSet’ configured with the parameter ‘trs-lnfo’, or by the higher layer parameter ‘trs-ResourceSetConfig’. The resources provided in a NZP CSI-RS resource set configured with the parameter ‘trslnfo’ are called CSI-RS for tracking in the following, and the resources provided in ‘trs-ResourceSetConfig’ are called TRS in the following. In certain embodiments, a CSI-RS for tracking is configured to the UE which is transmitted when the RRC is in ‘connected’ mode, and the TRS is configured and transmitted when the RRC is in ‘idle’ or ‘inactive’ mode.

[0093] In certain embodiments, the UE is configured with up to two or four resources for tracking in a resource set.

[0094] In certain embodiments, CSI-RS for tracking or TRS resource(s) or resource set(s) is / are configured with a periodic time-domain behavior. This allows the UE to continuously track parameters such as Doppler shift / spread, delay parameters, pathloss, etc. without interruption. The interruption happens only when there is a RRC reconfiguration which results in a different beam and QCL parameters of the CSI-RS or TRS.

[0095] In certain embodiments, CSI-RS for tracking or TRS resource(s) or resource set(s) is / are configured with aperiodic time-domain behavior. Aperiodic tracking RSs typically have periodic tracking RSs as QCL sources. This is typically used to reactivate transmissions in discontinuous reception (DRX) scenarios.

[0096] In certain embodiments, the UE is configured to receive a configuration of at least one CSI- RS resource set that is / are configured with a parameter ‘repetition’ set to ‘on’. All the resources configured in the set are then transmitted by a network node with the same spatial domain transmit filter.

[0097] The CSI-RS for tracking or TRS acts as the primary RS used in providing the QCL assumptions for most DL channel receptions and for CSI-RS used in CSI acquisition and / or DL Tx beam management (CSI-RS configured without the parameter ‘repetition’ or with the parameter ‘repetition’ set to ‘off’).

[0098] The RSs used for channel parameter tracking are typically periodic (aperiodic CSI-RS for tracking or TRS is QCL-ed with periodic TRSs) and have ‘good’ frequency domain density and bandwidth (higher bandwidth than that of SSBs), which are well suited for the estimation of channel Doppler and delay parameters with high accuracy. Up to four periodic RSs can be configured for tracking that are associated resource-wise with up to four SSBs via QCL type ‘C’ and / or ‘D’, if applicable. With up to 64 or 128 SSBs configurable for a cell across various subcarrier spacings in the 5G NR numerology to cover the entire cell area, the RSs used for tracking can be understood to be tracking channel parameters within a certain subset of the cell coverage area corresponding to the SSBs that the RSs for tracking are associated with. While SSBs are used for cell identification and synchronization, the RSs for tracking form the next step before data transmission: high resolution tracking of channel parameters for a subset of beams corresponding to the configured SSBs (i.e., a subset of the cell coverage area that it is located in) to facilitate reliable DL / LIL physical channel transmissions. The UE is avoided from tracking channel parameters for a wide range of SSBs (typically from SSBs with lower received power that are aimed at other areas of the cell), which thereby reduces UE complexity. However, this might also lead to a disadvantage when the UE is mobile. As the UE moves, the strongest SSBs that are associated with the UE may also change. Along with that, the SSBs associated with the RSs for tracking also need to change to track the ‘right’ SSBs for tracking and channel receptions / transmissions. However, since the update of TCI- States or QCL assumptions for the RSs for tracking is possible only via RRC signaling that has significant latency, the channel parameter tracking may not be able to keep up with UEs of higher mobility, especially in cells with a higher number of SSBs that are highly spatially selective. The smaller number of the RSs for tracking and the slow update of the TCI-states, in this case, acts as a bottleneck for accurate large scale channel parameter tracking which is subsequently crucial for the reliability of downlink channel transmissions and uplink transmissions.

[0099] To address the aforementioned issues, this invention proposes several enhancements for semi-persistent tracking or periodic tracking signals with dynamically switchable reception settings. In addition, UE maneuvers to adapt to the disruptions in the tracking process are also provided.

[0100] MAC-CE- or PDCCH-based TCI-State signaling

[0101] In certain embodiments, the UE is configured to, receive a PDCCH or a Medium Access Control - Control Element (MAC-CE) message from a network node that indicates one or more TCI-State(s) providing reception setting(s) for one or more resources or resource sets of a DL reference signal, RS, and / or providing transmission setting(s) for one or more resources or resource sets of an UL RS, wherein said resource(s) or resource set(s) of the DL / UL RS is / are configured with periodic or semi- persistent time-domain behavior, and

[0102] - apply o said reception setting(s) for the reception of said resource(s) or resource set(s) of the DL reference signal, and / or o said transmission setting(s) for the transmission of said resource(s) or resource set(s) of the UL reference signal.

[0103] In certain embodiments, the UE is configured to, receive a PDCCH or a Medium Access Control - Control Element (MAC-CE) message from a network node that indicates one or more TCI-State(s) for one or more resources or resource sets of a DL reference signal, RS, and / or one or more resources or resource sets of an UL RS, wherein said resource(s) or resource set(s) of the DL / UL RS is / are configured with periodic or semi-persistent time-domain behavior, and apply said one or more TCI-State(s) to o said resource(s) or resource set(s) of the DL reference signal, and / or o said resource(s) or resource set(s) of the UL reference signal.

[0104] In certain embodiments, a resource set of a DL or UL reference signal comprises one or more resources of said DL or UL reference signal.

[0105] In certain embodiments, the DL reference signal is the CSI-RS or the TRS.

[0106] In certain embodiments, the UL reference signal is a sounding reference signal, SRS.

[0107] In certain embodiments, the TCI-state comprises one or more reference signals and for each reference signal one or more quasi-colocation (QCL) assumption / setting type, which refer to the reception setting(s). The QCL assumption(s) or setting(s) are reception setting(s) provided for the reception of the one or more resources or resource sets of the DL reference signal at the UE.

[0108] In certain embodiments, the TCI-state comprises: one or more reference signals used as pathloss reference(s), and / or power control settings.

[0109] The pathloss reference(s) and / or power control settings are transmission setting(s) and provided for the transmission of the one or more resources or resource sets of the UL reference signal. They may be used to compute the UL Tx power for the transmission of said resource(s) or resource set(s) of said UL reference signal.

[0110] In certain embodiments, the one or more DL RS resource(s) or resource set(s) is / are configured for tracking. In some examples, said DL resource(s) or resource set(s) are CSI-RS resource(s) or resource set(s). This may mean that the resource(s) or resource set(s) is / are configured with ‘trslnfo’. In some other examples, said DL resource(s) or resource set(s) are TRS resource(s) or resource set(s) configured via the higher layer parameter ‘trs- ResourceSetConfig’.

[0111] In certain embodiments, the UE is configured with N CSI-RS or TRS resource(s) via a higher layer (e.g., RRC).

[0112] In certain embodiments, it is configured to receive a PDCCH or MAC-CE message that comprises at least the ID(s) of M < N TCI-State(s). After receiving the PDCCH or MAC-CE message, the UE applies the m-th TCI-State indicated in the PDCCH or MAC-CE message to an m-th CSI-RS resource or TRS resource (for e.g., with respect to an increasing order of the resource ID / index among the N resource(s)). In some examples, the CSI-RS or TRS resource(s) is / are periodic or semi-persistent.

[0113] In certain embodiments, the UE is configured with N CSI-RS resources or TRS resources in a cell.

[0114] In certain embodiments, the UE is configured with N resource(s) in a CSI-RS or TRS resource set, i.e., the CSI-RS or TRS resource set comprises N resources.

[0115] In some options, the ID(s) or index / indices corresponding to the M CSI-RS or TRS resource(s) to which the M indicated TCI-State(s) is / are applied, is / are also provided in the PDCCH or MAC-CE message.

[0116] Update of QCL assumptions without TCI-State indication

[0117] In certain embodiments, the UE is configured with N > M CSI-RS resources or TRS resources, and configured to

[0118] • receive a PDCCH or a MAC-CE message from a network node indicating at least the I D(s) of M > 1 synchronization signal block (SSB) resources, and

[0119] • perform a QCL assumption or association between M configured CSI-RS or TRS resources and the M indicated SSB resources.

[0120] In certain embodiments, the UE is configured to

[0121] • receive a PDCCH or a MAC-CE message from a network node indicating at least o the ID(s) of M > 1 synchronization signal block (SSB) resources, o the ID(s) of M CSI-RS or TRS resources, and

[0122] • perform / apply a QCL assumption or association between the M indicated CSI-RS or TRS resources and the M indicated SSB resources.

[0123] In certain cases, the CSI-RS or TRS resource(s) are configured for tracking. This may mean that the CSI-RS resource(s) or the resource set(s) that they belong to may be configured with the parameter ‘trslnfo’ or the TRS resource(s) or the resource set(s) that they belong to may be configured via the higher layer parameter ‘trs-ResourceSetConfig’.

[0124] In certain embodiments, the UE is configured with N > M CSI-RS or TRS resources, and configured to

[0125] • receive a PDCCH or a MAC-CE message from a network node, wherein the PDCCH or the MAC-CE message indicates at least o the ID(s) of M > 1 synchronization signal block (SSB) resources, and o the ID(s) of M > 1 CSI-RS resources, and

[0126] • perform / apply a QCL assumption or association between o M configured CSI-RS or TRS resources and the M indicated SSB resources, and o M configured CSI-RS or TRS resources and the M indicated CSI-RS resources.

[0127] In some examples, the / V configured CSI-RS / TRS resources are for tracking. In some options, the indicated M CSI-RS resources are not configured for tracking. In a few other examples, the M indicated CSI-RS resources are different from any of the N configured CSI-RS or TRS resources.

[0128] In certain embodiments, the UE is configured to

[0129] • receive a PDCCH or a MAC-CE message from a network node indicating at least o the ID(s) of M > 1 synchronization signal block (SSB) resources, o the I D(s) of M CSI-RS resources, o the ID(s) of M CSI-RS resources for tracking or TRS resources, and

[0130] • to perform / apply a QCL assumption or association between the o the M indicated CSI-RS resources for tracking or TRS resources and the M indicated SSB resources in the PDCCH or the MAC-CE message, and o the M indicated CSI-RS resources for tracking or TRS resources and the M indicated CSI-RS resources in the PDCCH or the MAC-CE message.

[0131] In some options, the indicated M CSI-RS resources are not configured for tracking and are different from the indicated M CSI-RS resources for tracking or TRS resources. In certain embodiments, the M CSI-RS or TRS resources provided in a PDCCH or MAC-CE message indicate M < N resources from N configured CSI-RS or TRS resources.

[0132] In certain cases, the CSI-RS or TRS resource(s) for which TCI-State(s) or the QCL assumptions are applied / performed (the CSI-RS / TRS resource(s) that is / are the target in the QCL assumption) is / are configured with periodic or semi-persistent time-domain behavior.

[0133] In certain embodiments, the UE is configured to receive a PHY-, MAC- or higher layer signaling that updates or leads to an update of the TCI-State or the QCL assumption(s) of a CSI-RS / TRS resource, when said resource is active. In this case, the resource (or the resource set that the resource belongs to) may be configured with semi-persistent timedomain behavior.

[0134] Following the reception of the PDCCH or the MAC-CE message, the UE assumes that the M CSI-RS or TRS resource(s) / resource set(s), indicated by the PDCCH or the MAC-CE, or configured via a higher layer, are QCL-ed with the M SSB resource(s) indicated in the PDCCH or the MAC-CE message via at least one of the four QCL types: ‘A’, ‘B’, ‘C’, ‘D’. In certain examples, the QCL type used in the QCL assumption is QCL type ‘C’, and if applicable, QCL type ‘D’.

[0135] In certain embodiments, the PDCCH or MAC-CE message indicates the QCL type(s) that the UE shall use for the QCL assumption used between the CSI-RS or TRS resource(s) and the indicated SSB resource(s). In some examples, the indication is a x-bit field in the PDCCH or the MAC-CE, where x > 1. A value of a0for the field may indicate that the UE shall assume that the CSI-RS / TRS resource(s) are QCL-ed with the SSB resource(s) via QCL type ‘C’. A value of a for the field may indicate that the UE shall assume that the CSI-RS / TRS resource(s) are QCL-ed with the SSB resource(s) via QCL type ‘C’, and if applicable, QCL type ‘D’. In certain examples, the size of % is 1.

[0136] Following the reception of the PDCCH or the MAC-CE message, the UE assumes that M CSI- RS resource(s) for tracking or TRS resource(s) indicated by the PDCCH or the MAC-CE or configured via a higher layer, is / are QCL-ed with the M CSI-RS resource(s) indicated in the PDCCH or the MAC-CE message via at least one of the four QCL types: ‘A’, ‘B’, ‘C’, ‘D’. In certain examples, the QCL type used in the QCL assumption is QCL type ‘D’, if applicable. In certain cases, the CSI-RS resource(s) that serve as the QCL source is / are not configured for tracking.

[0137] In certain examples, the QCL type used in the association between the M CSI-RS resource(s) for tracking or M TRS resource(s) and the M SSB resource(s) is QCL type ‘C’, and the QCL type used in the QCL assumption or association between the M CSI-RS resource(s) for tracking or M TRS resource(s) and the M CSI-RS resource(s) (in some examples, these resource(s) is / are not configured for tracking) is QCL type ‘D’.

[0138] In certain examples, the CSI-RS resource(s) that is / are not configured for tracking is / are configured with the higher layer parameter ‘repetition’.

[0139] In certain embodiments, the UE assumes that an indicated or configured CSI-RS resource for tracking or TRS resource is QCL-ed via QCL type ‘C’ with an indicated SSB resource, while retaining any QCL type ‘D’ assumption that said CSI-RS / TRS resource already has. In certain examples, this UE behavior is enabled via a PDCCH or MAC-CE signaling from a network node.

[0140] In certain embodiments, the UE is configured to receive a PDCCH or MAC-CE message from a network node activating or deactivating the transmission of one or more resources / resource sets of TRS or CSI-RS configured for tracking.

[0141] In certain embodiments, the UE is configured to receive one or more TCI-States for DL resource(s) / resource set(s) that is / are active (for e.g., CSI-RS for tracking or TRS), in a PDCCH or MAC-CE message. In certain examples, said RS is configured with semi-persistent time-domain behavior.

[0142] An example of the possible QCL types indicated / assumed for the RSs used for tracking by some embodiments herein is provided in Figure 2.

[0143] Calibration of tracking parameters after QCL updates

[0144] The UE tracks several large-scale channel parameters across various DL reference signals. The QCL types associated with a source RS and / or the pathloss reference usage of a source RS enables the UE to derive the corresponding channel parameter(s) from said RS, and uses them for channel estimation, demodulation of a signal or channel, link adaptation, beam management, synchronization, UL power control, etc. For example, the parameters such as ‘Doppler spread’, ‘delay spread’ and spatial Rx parameter (if applicable) are required for the demodulation of the PxSCH (QCL type ‘A’, ‘D’ if applicable). For the reception of CSI-RS resources without ‘repetition’, spatial Rx parameters, if applicable, are required with timefrequency parameter references (QCL type ‘C’ and / or ‘B’, ‘D’ if applicable) for the processing at the UE. Any disruption in the estimation of the parameters tracked from these RSs, for example due to beam changes, mobility or changes in the configuration of the RSs used for tracking, would result in affecting the reliability of the DL reception of channels and RSs, and UL power control. Therefore, the following aspects need to be considered when modifying the transmission of tracking RSs via any network signaling:

[0145] The disruption of the tracking of the parameters derived from the CSI-RS for tracking or TRS, and the disruption in the usage of said parameters for the reception of signals and channels that use CSI-RS for tracking or TRS as a QCL source RS.

[0146] In certain embodiments, the UE is configured to determine, estimate, measure or track at least one of the following parameters:

[0147] Pathloss,

[0148] - Average gain,

[0149] - Average delay,

[0150] Delay spread,

[0151] Doppler spread,

[0152] Doppler shift, from a CSI-RS / TRS resource. In this disclosure, they may also be mentioned as ‘channel parameters’ in certain instances.

[0153] These parameters may correspond to the channel on which the port(s) of the CSI-RS or TRS resource is conveyed.

[0154] In certain embodiments, the UE is configured to determine, estimate, measure or track at least one of the following from a CSI-RS or TRS resource:

[0155] One or more channel parameters corresponding to a QCL assumption with a DL channel or RS, Pathloss.

[0156] In certain embodiments, the UE is configured to receive a configuration or an indication indicating a DL RS resource / resource set, and receive a transmission of a DL channel or CSI-RS transmission that is QCL-ed with said DL RS resource or a DL RS resource from said DL RS resource set with respect to one or more channel parameters.

[0157] Said channel parameters shall be at least one of the following: pathloss, average gain, average delay, delay spread, Doppler spread, Doppler shift, spatial Rx parameters. In certain examples, the parameter(s) with respect to which the QCL is assumed for a DL channel or CSI-RS with a DL RS resource is provided via a QCL-type. For instance, the QCL-type may be type ‘A’, ‘B’, ‘C’ or ‘D’.

[0158] The estimate or measurement of one or more of the above parameters may be used by the UE for the demodulation, decoding or reception of a DL channel or RS. The parameter(s) used for the demodulation, decoding or reception may be determined based on the QCL type.

[0159] In certain embodiments, the UE is configured to receive a configuration or an indication of a DL RS resource / resource set, and perform the transmission of a UL channel or RS that uses the pathloss estimate or measurement from said DL RS resource or a DL RS resource from said DL RS resource set to determine a Tx power for the transmission of said UL channel or RS.

[0160] In some examples, the DL RS resource / resource set is a CSI-RS or TRS resource / resource set. In some examples, the CSI-RS resource / resource set is configured for tracking. This may mean that the CSI-RS resource / resource set is configured with the parameter ‘trslnfo’ or the TRS resource / resource set is configured via the higher layer parameter ‘trs- ResourceSetConfig’.

[0161] In some examples, said CSI-RS or TRS is configured with periodic or semi-persistent time domain behavior.

[0162] In certain embodiments, the UE is configured to reset the determination, estimation, measurement or tracking of one or more parameters from a CSI-RS or TRS resource after the reception of a PHY-, MAC- or a higher layer signaling that either updates a TCI-State and / or QCL assumptions of said CSI-RS / TRS resource, or activates or deactivates the transmission of said CSI-RS / TRS resource (or the resource set that the resource belongs to). In certain embodiments, the reset of an estimation, measurement or tracking of a parameter from a reference signal, RS, resource involves at least one of the following: the tracking of the parameter from the RS resource is performed until a predetermined or specified time instance of reset and re-started thereafter, at least one value related to the estimate(s) or measurement(s) of said parameter from the RS resource is / are set to zero at, before or after a predetermined or specified time instance of reset, at least one value related to the history of estimate(s) or measurement(s) of said parameter from the RS resource is cleared or set to zero at, before or after a predetermined or specified time instance of reset.

[0163] In certain embodiments, an activation signaling for a semi-persistent CSI-RS / TRS resource / resource set may be received when the CSI-RS / TRS resource / resource set is active.

[0164] In certain examples, the activation signaling provides one or more TCI-States that are applied by the UE to the activated resource(s). In detail, the signaling may provide M > 1 TCI-States for M CSI-RS / TRS resource(s) activated by it. If a CSI-RS or TRS resource set is activated by the signaling, the signaling provides as many TCI-States as the number of resources in the CSI-RS / TRS resource set.

[0165] In certain embodiments, the UE is configured to receive a PHY-, MAC- or a higher layer signaling that activates at least one semi-persistent CSI-RS / TRS resource or resource set along with a signaling or indication that deactivates the same resource(s) or resource set(s). This type of signaling ensures continuity of the parameter estimation for semi-persistent CSI- RS / TRS resources. If there is discontinuity of the transmission of the CSI-RS / TRS resource from which large-scale parameters are derived, the loss of the parameter tracking may lead to instability in the decoding of channels and RSs that have said resource as a QCL source RS. Therefore, activating a semi-persistent resource along with its deactivation ensures the continuity of the transmission.

[0166] In some examples, the activation and deactivation signaling are obtained via a single MAC- CE message or PDCCH. In some other examples, the deactivation signaling is obtained in a first MAC-CE message or a first PDCCH, and the activation signaling is obtained in a second MAC-CE message or a second PDCCH. In certain options, the first and second MAC-CE messages are received in the same PDSCH. In certain embodiments, after receiving said signaling(s), the transmission of the indicated CSI-RS / TRS resource or resource set(s) is deactivated and then subsequently activated by applying the indicated TCI-States.

[0167] In some examples, the activated / deactivated CSI-RS / TRS resource or resource set is configured for tracking (the CSI-RS / TRS resource or resource set is configured with the parameter ‘trslnfo’ or configured using the parameter ‘trs-ResourceSetConfig’).

[0168] In certain embodiments, the UE is configured to receive a PHY-, MAC- or a higher layer signaling that indicates at least,

[0169] M > 1 TCI-State(s), or

[0170] ID(s) of M > 1 SSB resource(s) and / or M > 1 CSI-RS resource(s) that are not configured for tracking, for updating the QCL assumptions for M > 1 CSI-RS resources for tracking or TRS resources configured with semi-persistent time domain behavior, when said resource(s) are active.

[0171] In certain examples, the received signaling may comprise a flag or a bit for the activation of said resource(s) or a resource set associated with the resource(s).

[0172] After the reception of said signaling, the UE applies the indicated TCI-State(s) to said M CSI-RS resources for tracking or TRS resources, or assumes that the indicated M SSB(s) and / or CSI-RS resource(s) are QCL-ed with said M CSI-RS resource(s) for tracking or TRS resource(s), with respect to an indicated or specified / predetermined QCL type.

[0173] With such a signaling, the UE can continually transmit semi-persistent resources without any interruption of the transmission by applying a TCI-State change.

[0174] In certain embodiments, TCI-State(s) or QCL assumption(s) is / are applied by the UE to CSI- RS / TRS resource(s) / resource set(s) at least after gslots> 0 slots or gms> 0 ms after at least one of the following events: the reception of the PHY-, MAC or higher layer signaling which o provides the TCI-State(s) or QCL assumption(s) for said CSI-RS / TRS resource(s) / resource set(s), or o activates said CSI-RS / TRS resource(s) / resource set(s), the transmission of an acknowledgement (for e.g., Hybrid Automatic Repeat Request, HARQ, Acknowledgement, ACK, message) corresponding to the PDSCH / PDCCH that comprises the PHY-, MAC or higher-layer signaling which o provides the TCI-State(s) or QCL assumption(s) for said CSI-RS / TRS resource(s) / resource set(s), or o activates said CSI-RS / TRS resource(s) / resource set(s).

[0175] In certain embodiments, the time instance for the reset of the estimation, measurement or tracking of a parameter from a RS resource / resource set is the same as the slot or symbol or time instant at which a TCI-State update or QCL assumption update is applied / performed to / for said RS resource / resource set. In certain examples, the resource / resource set may be a CSI- RS / TRS resource / resource set configured for tracking.

[0176] In certain embodiments, the value of gslotsor gmsis provided by the specifications, i.e., it is known to the UE. In certain examples, the value is dependent on at least the numerology of the waveform used for the transmission of at least the CSI-RS resource(s) or TRS resource(s), or the numerology of the waveform used in the DL, in general.

[0177] While the reset of the estimation, tracking or measurement process for a parameter is discussed above, their consequences for the usage of the estimated value of said parameter for channels and RSs that use the parameters for the reception or transmission are discussed in the following.

[0178] An illustration timeline of the adaptation of the QCL assumptions for tracking reference signals and the corresponding UE behaviour according to some embodiments herein is provided in Figure 3.

[0179] It is to be noted that, any reference to an instance or a point in time in this disclosure may denote a point in time, or denote a slot, a symbol or a subframe in a radio frame. A combination of any number of radio frame structures or parameters, and / or units of time may be used to express the value of an instance or a point in time.

[0180] In certain embodiments, the UE is configured to

[0181] • receive a PHY-, MAC- or a higher layer signaling that either o updates or results in an update of TCI-State(s) and / or QCL assumption(s) or association(s) of a periodic or semi-persistent CSI-RS or TRS resource, or o activates or deactivates the transmission of a semi-persistent CSI-RS or TRS resource, and

[0182] • use a parameter determined, measured, estimated or tracked from said CSI-RS or TRS resource for o the reception of (port(s) of) a DL channel or RS, or o for the computation of a Tx power of a UL channel or RS.

[0183] In certain embodiments, the UE receives the PHY-, MAC- or a higher layer signaling that either updates or leads to an update of TCI-State(s) and / or QCL assumption(s) of said CSI-RS or TRS resource, or activates or deactivates the transmission of said CSI-RS or TRS resource, at a time instance tq.

[0184] In certain embodiments, the UE is configured to use a previously estimated or computed value of a channel parameter from a CSI-RS or TRS resource for the reception of a DL channel or RS, or the computation of a Tx power of a UL channel or RS, after the UE receives a PHY-, MAC- or a higher layer signaling that either updates or leads to an update of TCI-State(s) and / or QCL assumption(s) of said CSI-RS or TRS resource, or activates or deactivates the transmission of said CSI-RS or TRS resource.

[0185] According to the above embodiment, the UE is configured to use a previously estimated or computed value of a channel parameter from a CSI-RS or TRS resource for its intended purpose(s) after the time instance tq.

[0186] In certain examples, said DL channel or RS is assumed by the UE to be QCL-ed or is QCL- ed with said CSI-RS resource or TRS resource.

[0187] In certain examples, said CSI-RS or TRS resource is used / indicated / configured as a pathloss reference RS for said UL channel or RS.

[0188] In certain examples, the UE is configured to use a previously determined, estimated, tracked or computed value of a channel parameter from a CSI-RS or TRS resource for the reception of a DL channel or RS, or the computation of a Tx power of a UL channel or RS, starting from one of the following time instances (labeled ts): the time instance of application of a TCI-State or QCL assumption for the CSI-RS resource or TRS resource, or the time instance of deactivation or activation of the CSI-RS or TRS resource, or the instance of reset of estimation / tracking of said parameter, or an instance after the reset of estimation / tracking of said parameter, until a predetermined or specified instance of time (labeled te) that occurs after one of the above instances.

[0189] In certain embodiments, the duration between tqand tsis a predetermined value or fixed in the specifications, i.e., it is known to the UE. In certain instances, tq- ts> 0, i.e., the time instance tsappears after tq.

[0190] In certain embodiments, the previously determined, estimated, tracked or computed value of said parameter from said CSI-RS or TRS resource is the value of said parameter determined / estimated / computed / tracked before ts.

[0191] In certain embodiments, the UE is configured to report a UE capability value that is related to ts, teor the difference between them (te- ts).

[0192] In certain embodiments, the duration between tsand te(labeled gc) is fixed in the specifications, i.e., it is known to the UE.

[0193] In certain embodiments, the value of gcis provided in terms of slot(s), symbol(s) or millisecond(s).

[0194] In certain embodiments, the UE is configured to use a value of a channel parameter estimated or computed from a CSI-RS or TRS resource o between time instances tsand te, or o at te, for the reception of a DL channel or RS, or for the computation of a Tx power of a UL channel or RS after time instance te.

[0195] In certain embodiments, the UE is configured to apply a current or latest value of a parameter determined, estimated or computed from a CSI-RS or TRS resource for the reception of a DL channel or RS, or for the computation of a Tx power of a UL channel or RS after time instance te-

[0196] In the above methods, the DL channel or RS is QCL-ed with said CSI-RS or TRS resource and / or the UL channel or RS uses said CSI-RS or TRS resource as a pathloss reference.

[0197] In certain embodiments, the UE is configured to:

[0198] • receive from a network node, o a configuration and / or indication providing a CSI-RS or TRS resource or a CSI-RS or TRS resource set comprising one or more CSI-RS or TRS resources, and o a configuration, indication and / or scheduling of a DL channel (e.g., PDSCH or PDCCH) or RS (e.g., CSI-RS) transmission for which the source RS for the QCL assumption(s) is said CSI-RS or TRS resource, or a resource from said CSI-RS or TRS resource set, or o a configuration, indication and / or scheduling of an UL channel (e.g., PUSCH or PUCCH) or RS (e.g., SRS) transmission, wherein the reference to compute or estimate the pathloss for calculation of an UL Tx power is said CSI-RS or TRS resource, or a resource from said CSI-RS or TRS resource set, o a PHY-, MAC or a higher layer signaling that updates or leads to an update of the TCI-State(s) or QCL assumption(s) of said CSI-RS or TRS resource or resource(s) in said CSI-RS or TRS resource set,

[0199] • apply said update of QCL assumption(s) or TCI-State(s) to said CSI-RS or TRS resource or resource(s) in said CSI-RS or TRS resource set, at a predetermined or specified time instant after reception of said signaling, and

[0200] • determine or obtain value(s) of at least one of the following from said CSI-RS or TRS resource or resource set up to, at or before the application of said QCL assumption(s) or TCI-State(s), o channel parameter(s) at least corresponding to the QCL assumption(s) associated with said at least one DL channel or RS, o pathloss estimate(s), and

[0201] • use at least one of said determined or obtained values after the application of said QCL assumption(s) or TCI-State(s) to said CSI-RS or TRS resource or resource(s) in said CSI- RS or TRS resource set for a specified or predetermined time duration ga, at least for one of the following purposes: o the reception of (port(s) of) said DL channel or RS, or o the determination of the transmit, Tx, power for the transmission of said UL channel or RS.

[0202] In certain embodiments, the UE is configured to perform a reset of a determination, estimation, measurement or tracking of one or more channel parameters or pathloss from a CSI-RS or TRS resource / resource set at, before or after the application of an update of QCL assumption(s) or TCI-State(s) for said CSI-RS or TRS resource / resource set.

[0203] The UE behavior(s) that the process of reset may involve is described above in this invention disclosure.

[0204] In certain embodiments, the specified or predetermined duration gais provided in terms of slots, ms or symbols. This may be provided in the specifications and may be dependent on the numerology used for the transmission of the CSI-RS or TRS or the numerology used for DL transmissions, in general.

[0205] In certain embodiments, the CSI-RS or TRS resource / resource set is configured with periodic or semi-persistent time-domain behavior. In some examples, the resource / resource set is configured for tracking.

[0206] The above scheme can be applied to a DL RS for tracking that is always active (periodic timedomain behavior) with just TCI-State changes to it via lower layers. A possible timeline of events involved for such a scheme is provided in Figure 2. If semi-persistent tracking RS is to be enabled, the following needs to be done.

[0207] In certain embodiments, the UE is configured to: receive from a network node, o a configuration and / or indication of a CSI-RS or TRS resource or a CSI-RS or TRS resource set comprising one or more CSI-RS or TRS resources, and o a configuration, indication and / or scheduling of a DL channel (e.g., PDSCH or PDCCH) or RS (e.g., CSI-RS) transmission for which the source RS for the QCL assumption(s) is said CSI-RS or TRS resource, or a resource from said CSI-RS or TRS resource set, or o a configuration, indication and / or scheduling of an UL channel (e.g., PUSCH or PUCCH) or RS (e.g., SRS) transmission, wherein the reference to compute or estimate the pathloss for calculation of an UL Tx power is said CSI-RS or TRS resource, or a resource from said CSI-RS or TRS resource set, o a first PHY-, MAC or a higher layer signaling that deactivates said CSI-RS or TRS resource / resource set, o an indication along with said first signaling or via a different signaling that activates / reactivates said CSI-RS or TRS resource / resource set, and determining or obtaining value(s) of at least one of the following from said CSI-RS or TRS resource or resource set up to, at or before its deactivation: o channel parameter(s) at least corresponding to the QCL assumption(s) associated with said at least one DL channel or RS, o pathloss estimate(s), and using at least one of said determined or obtained value(s) after the deactivation of said CSI-RS or TRS resource or resource set for a specified or predetermined time duration ga, at least for one of the following purposes: o the reception of (port(s) of) said DL channel or RS, or o the determination of the Tx power for the transmission of said UL channel or RS.

[0208] In certain embodiments, a reset of the estimation, tracking or measurement process for a channel parameter or pathloss is performed after the deactivation signaling is received.

[0209] In certain embodiments, the CSI-RS or TRS resource / resource set is configured with periodic or semi-persistent time-domain behavior. In some examples, the resource / resource set is configured for tracking.

[0210] In certain embodiments, a CSI-RS or TRS resource / resource set is deactivated via a first signaling and reactivated via the same signaling or via a second / different signaling. In an example, a MAC-CE message or PDCCH may indicate the deactivation and the reactivation / activation (a subsequent activation, for instance) of the CSI-RS resource / resource set. In a second example, the signaling for deactivation and the reactivation are received in separate MAC-CE messages or PDCCHs. In an option of the second example, both MAC-CE messages are received in the same PDSCH.

[0211] In certain embodiments, the UE is configured to use one or more channel parameters determined, estimated, measured or tracked up to, at or before the deactivation of said CSI- RS or TRS resource / resource set for a predetermined or specified duration that starts at gp> 0 slots / symbols / ms after at least one of the following: the deactivation of said CSI-RS or TRS resource / resource set, the reactivation of said CSI-RS or TRS resource / resource set, and ends gq> 0 slots / symbols / ms after the reactivation of said CSI-RS or TRS resource / resource set. In certain examples, gp> 0 and / or gq> 0.

[0212] In certain embodiments, the UE is configured to:

[0213] • receive from a network node, o a configuration and / or indication indicating a first CSI-RS or TRS resource or resource set and a second CSI-RS or TRS resource or resource set, wherein a CSI-RS or TRS resource set comprises one or more CSI-RS or TRS resources, and o a configuration, indication and / or scheduling of a DL channel (e.g., PDSCH or PDCCH) or RS (e.g., CSI-RS) transmission for which the source RS for the QCL assumption(s) is said CSI-RS or TRS resource, or a resource from said first CSI-RS or TRS resource set, or o a configuration, indication and / or scheduling of an UL channel (e.g., PLISCH or PLICCH) or RS (e.g., SRS) transmission, wherein the reference to compute or estimate the pathloss for calculation of an UL Tx power is said first CSI-RS or TRS resource, or a resource from said first CSI-RS or TRS resource set, o a first PHY-, MAC or a higher layer signaling that deactivates said first CSI-RS or TRS resource / resource set, o an indication along with said first signaling or via a different signaling that activates said second CSI-RS or TRS resource / resource set, and

[0214] • update o at least one QCL assumption for the reception of (port(s) of) said DL channel (e.g., PDSCH or PDCCH) or RS (e.g., CSI-RS), or o a pathloss reference for said UL channel or RS (e.g., PUSCH, PUCCH or SRS), wherein the update is performed after the signalling that activates said second CSI-RS or TRS resource / resource set.

[0215] In certain embodiments, the first CSI-RS or TRS resource / resource set is deactivated via the first signaling and a second CSI-RS or TRS resource / resource set is activated via the same signaling or via a second / different signaling. In one option, the first CSI-RS or TRS is deactivated and the second CSI-RS or TRS is activated by the same MAC-CE message or PDCCH. In a second option, the first CSI-RS or TRS is deactivated by a first MAC-CE message or PDCCH and the second CSI-RS or TRS is activated by a second MAC-CE message or PDCCH. In a further example of the second option, the first and second MAC-CE messages may be obtained in the same PDSCH. In certain embodiments, the first and second CSI-RS or TRS resources / resource sets are configured with periodic or semi-persistent time-domain behavior. In some examples, they are configured for tracking.

[0216] In certain embodiments, the second or different signaling is received before or after said first signaling.

[0217] If the UE receives the activation signaling for a CSI-RS or TRS resource / resource set, the UE performs its reception after the reception of the activation signaling, i.e., it is transmitted by the network after the activation signaling.

[0218] If the UE receives the deactivation signaling for a CSI-RS or TRS resource / resource set, it denotes that the transmission of the CSI-RS or TRS is to be stopped by the network and the UE will not receive it.

[0219] The signaling that activates a CSI-RS or TRS resource / resource set may also provide TCI- States or QCL assumption(s) to be applied to the said CSI-RS or TRS resource(s).

[0220] From the above, the second possibility requires QCL changes for all the channels and RSs that were using the deactivated first CSI-RS resource / resource set as QCL source(s).

[0221] In certain embodiments, the UE is configured to update: at least one QCL assumption for the reception of (port(s) of) said DL channel (e.g., PDSCH or PDCCH) or RS (e.g., CSI-RS) wherein said second CSI-RS or TRS resource or a resource from said second CSI-RS or TRS resource set is updated as the QCL source, or a pathloss reference for said UL channel or RS (e.g., PUSCH, PUCCH or SRS) wherein said second CSI-RS or TRS resource or a resource from said second CSI-RS or TRS resource set is updated as pathloss reference.

[0222] In certain embodiments, the UE is configured to assume a DL channel / RS is QCL-ed with the deactivated first CSI-RS or TRS resource or a resource from the resource set, or obtain a pathloss estimate / measurement for an UL channel or RS transmission from the deactivated first CSI-RS or TRS resource or a resource from the resource set, during at least one of the following instances: a predetermined or specified duration after the deactivation of said first CSI-RS or TRS resource / resource set, or a predetermined or a specified duration after the activation of said second CSI-RS or TRS resource / resource set.

[0223] In certain embodiments, the UE is configured to assume QCL or use the pathloss estimate(s) from the deactivated first CSI-RS or TRS resource / resource set for a predetermined or specified duration that starts at > 0 slots / symbols / ms after the deactivation of said first CSI- RS or TRS resource / resource set and ends g2> 0 slots / symbols / ms after the activation of said first or second CSI-RS or TRS resource / resource set. In certain examples, g2> 0. In certain examples, g}> 0. The value(s) of g , g2and / or the duration between them may be provided in the specifications, i.e. , known to the UE.

[0224] The retaining of QCL assumptions and pathloss reference after deactivation of the first CSI- RS or TRS resource / resource set may happen up to a certain duration after the reactivation of the next resource / resource set for transmission. This helps the estimate from the activated resource / resource set to stabilize and offers directives to the UE to preserve continuity of various channel parameter estimates at the UE even with disruptions in the RSs that provide the estimates.

[0225] UE-initiated beam switch for RSs used in tracking

[0226] In the methods described above, the network modifies the QCL setting(s) of the RSs used for tracking without any initiation by the UE. The decision for the update completely rests with the network. It is possible for the UE to initiate this process via DL measurements, especially SSB.

[0227] In certain embodiments, the UE is configured to transmit to a network node, via PUSCH or PUCCH, an indication of at least one TCI-State. In some examples, said at least one TCI- State is indicated for CSI-RS or TRS resource(s).

[0228] In certain embodiments, after the transmission of above signaling, the UE receives a signaling via PHY-, MAC or RRC layer that indicates an update of the TCI-State of at least one CSI-RS or TRS resource with said at least one TCI-State in the indication transmitted by the UE.

[0229] In certain embodiments, the UE is configured to transmit to a network node, via PUSCH or PUCCH, an indication that denotes at least one of the following:

[0230] - At least one ID / index of a SSB,

[0231] - At least one ID / index of a CSI-RS resource. In certain embodiments, after the transmission of above signaling, the UE shall receive a signaling via PHY-, MAC or RRC layer from a network node, for the update of a QCL assumption of at least one CSI-RS or TRS resource, wherein said at least one SSB or CSI- RS in the indication transmitted by the UE is / are used as the QCL source RS.

[0232] In some examples, the signaling from the network node that comprises SSB and / or CSI-RS resource I D(s), may also comprise the QCL type(s) to be used in the QCL assumption.

[0233] In some examples, the indicated CSI-RS resource(s) may be configured with ‘repetition’.

[0234] In some examples, the UE is configured to assume that said at least one CSI-RS or TRS resource is QCL-ed with said at least one SSB via QCL type ‘C’ and / or QCL type ‘D’, if applicable.

[0235] In some examples, the UE is configured to assume that said at least one CSI-RS or TRS resource is QCL-ed with said at least one CSI-RS resource configured without repetition via QCL type ‘D’, if applicable.

[0236] In certain embodiments, the UE is configured to transmit to a network node, via PUSCH or PUCCH, an indication that denotes at least one TCI-State.

[0237] In this disclosure, the CSI-RS resources involved in the discussions are non-zero-power (NZP) CSI-RS resources, unless specified to be of zero power (ZP).

[0238] In this disclosure, the reception of a configuration of a channel or RS resource or resource set by a communication device, or UE, may imply the reception of information by the communication device regarding transmission(s) or reception(s) of said channel or RS resource or resource set. The information / configuration may be received via a higher layer in certain instances (e.g., configuration obtained via RRC layer). For example, the information may be regarding at least one of the following that is / are used in the transmission / reception of said channel or RS resource or resource set: mapping or allocation of time / frequency / spatial resources, modulation / coding / rate-matching information, QCL assumption(s) / TCI-State(s), power control, pathloss reference, and so on. In some cases, the configuration is provided by a network node. In this disclosure, the reception of an indication of a channel or RS resource or resource set by a communication device, or UE, may imply the reception of information by the communication device regarding at least one of the following that is / are used in the transmission(s) or reception(s) of said channel or RS resource or resource set: triggering or activating transmission(s) / reception(s), indicating TCI-State(s) / QCL assumption(s), port(s) used for transmission(s), mapping or allocation of time / frequency / spatial resource(s), power control, pathloss reference and so on. In some examples, the indication is obtained via the PHY-layer (e.g., via PDCCH) or the MAC-layer (e.g., MAC-CE). In some cases, the indication is provided by a network node.

[0239] Referring to Figure 4, there is illustrated a method performed by a wireless device or a UE, according to some of the previously described embodiments. The method is performed by the wireless device or UE (1000), the method comprising:

[0240] • receiving (401) from a network node, o a configuration and / or an indication of a channel state information reference signal, CSI-RS, or Tracking Reference Signal, TRS, resource, o a configuration and / or an indication and / or a scheduling of a downlink, DL, channel or a reference signal, RS, transmission for which a source RS for Quasi-Co- Located, QCL, assumption(s) is said CSI-RS or TRS resource, or a configuration and / or an indication and / or a scheduling of an uplink, UL, channel or RS transmission, wherein a reference for computing or estimating a pathloss for calculation of an UL transmit, Tx, power in said CSI-RS or TRS resource, and o a physical, PHY layer signaling, or a medium access control, MAC, layer signaling, or a higher layer signaling for updating or for leading to an update of one or more transmission configuration indication, TCI-State(s) or an update of QCL assumption(s) of said CSI-RS or TRS resource; the method further comprising:

[0241] • applying (402) said update of said QCL assumption(s) or TCI-State(s) to said CSI-RS or TRS resource, at a predetermined or a specified time instant after reception of said signaling,

[0242] • determining or obtaining (403) value(s) of at least one of the following from said CSI- RS or TRS resource up to, at or before an application of said QCL assumption(s) or TCI-State(s): o channel parameter(s) corresponding to said QCL assumption(s) associated with said at least one DL channel or RS, and o one or more pathloss estimate(s), and • using or applying (404) at least one of said determined or obtained values after the application of said QCL assumption(s) or TCI-State(s) to said CSI-RS or TRS resource for a specified or predetermined time duration ga, at least for one of the following purposes: o a reception of (port(s) of) said DL channel or RS, or o a determination of a transmit, Tx, power for a transmission of said UL channel or RS.

[0243] Referring to Figure 5, there is illustrated a method performed by a wireless device according to some of the previously described embodiments. The method is performed by the wireless device or UE (1000), the method comprising: receiving (501) from a network node,

[0244] ■ a configuration and / or an indication of a CSI-RS or TRS resource ,

[0245] ■ a configuration and / or an indication and / or a scheduling of a downlink, DL, channel or a reference signal, RS, transmission for which a source RS for Quasi- Co-Located, QCL, assumption(s) in said CSI-RS or TRS resource, or a configuration and / or an indication and / or a scheduling of an uplink, UL, channel or RS transmission, wherein a reference for computing or estimating a pathloss for calculation of an UL transmit, Tx, power is said CSI-RS or TRS resource,

[0246] ■ a first physical layer, PHY-, signaling, or a first MAC signaling or a first higher layer signaling for deactivating said CSI-RS or TRS resource, and

[0247] ■ an indication along with said first signaling or via a different signaling that activates or reactivates said CSI-RS or TRS resource; determining or obtaining (502) value(s) of at least one of the following from said CSI- RS or TRS resource up to, at or before its deactivation: o one or more channel parameter(s) at least corresponding to the QCL assumption(s) associated with said at least one DL channel or RS, o pathloss estimate(s), and using or applying (503) at least one of said determined or obtained value(s) after the deactivation of said CSI-RS or TRS resource or resource set for a specified or predetermined time duration ga, at least for one of the following purposes: o the reception of (port(s) of) said DL channel or RS, or o the determination of the Tx power for the transmission of said UL channel or RS. Referring to Figure 6, there is illustrated a method performed by a wireless device according to some of the previously described embodiments. The method is performed by the wireless device or UE (1000), the method comprising:

[0248] • receiving (601) from a network node: o a configuration and / or indication indicating a first CSI-RS or TRS resource and a second CSI-RS or TRS resource, and wherein both first and second CSI-RS or TRS resource / resource set are configured for tracking with periodic or semi- persistent time-domain behavior, o a configuration, indication and / or scheduling of a DL channel or RS transmission for which the source RS for the QCL assumption(s) is said CSI-RS or TRS resource, or a configuration, indication and / or scheduling of an UL channel or RS transmission, wherein the reference to compute or estimate the pathloss for calculation of an UL Tx power is said first CSI-RS or TRS resource, o a first PHY-, MAC or a higher layer signaling that deactivates said first CSI-RS or TRS resource, and o an indication along with said first signaling or via a different signaling that activates said second CSI-RS or TRS resource; and

[0249] • updating (602) o at least one QCL assumption for the reception of said DL channel or RS, or o a pathloss reference for said UL channel or RS, wherein the update is performed after the signalling that activates said second CSI-RS or TRS resource.

[0250] In order to perform the previously described processes or method steps performed by the wireless device or UE, there is also provided a wireless device. Figure 10 illustrates a simplified block diagram depicting a wireless device or UE 1000. The wireless device 1000 comprises a processor 1010 or processing circuit or a processing module or a processor means 1010; a receiver circuit or receiver module 1040; a transmitter circuit or transmitter module 1050; a memory module 1020, a transceiver circuit or transceiver module 1030 which may include the transmitter circuit 1050 and the receiver circuit 1040. The wireless device 1000 further comprises an antenna system 1060 which includes antenna circuitry for transmitting and receiving signals to / from at least the network node or other wireless device(s). The antenna system employs beamforming as previously described.

[0251] The wireless device 1000 may belong to any radio access technology including 4G or LTE, LTE-A, 5G, advanced 5G or a combination thereof that support beamforming technology. The wireless device comprising the processor and the memory contains instructions executable by the processor, whereby the wireless device 1000 is operative or is configured to perform any one of the embodiments related to the wireless device as previously described.

[0252] The processing module / circuit 1010 includes a processor, microprocessor, an application specific integrated circuit (ASIC), field programmable gate array (FPGA), or the like, and may be referred to as the “processor.” The processor 1010 controls the operation of the wireless device and its components. Memory (circuit or module) 1020 includes a random-access memory (RAM), a read only memory (ROM), and / or another type of memory to store data and instructions that may be used by processor 1010. In general, it will be understood that the wireless device 1000 in one or more embodiments includes fixed or programmed circuitry that is configured to carry out the operations in any of the embodiments disclosed herein.

[0253] In at least one such example, the processor 1010 includes a microprocessor, microcontroller, DSP, ASIC, FPGA, or other processing circuitry that is configured to execute computer program instructions from a computer program stored in a non-transitory computer-readable medium that is in or is accessible to the processing circuitry. Here, “non-transitory” does not necessarily mean permanent or unchanging storage, and may include storage in working or volatile memory, but the term does connote storage of at least some persistence. The execution of the program instructions specially adapts or configures the processing circuitry to carry out the operations disclosed in this disclosure relating to the wireless device. Further, it will be appreciated that the wireless device 1000 may comprise additional components.

[0254] The wireless device 1000 by means of processor 1010 executes instructions contained in the memory 1020 whereby the wireless device is operative to perform any one of the previously described embodiments related to the actions performed by the wireless device, some of which are presented in anyone of appended claims1-22.

[0255] There is also provided a computer program comprising instructions which when executed by the processor 1010 of the wireless device cause the processor 1010 to carry out the method according to any one of the previously described embodiments.

[0256] Referring to Figure 7, there is illustrated a method performed by a network node (1100) according to some of the previously described embodiments. The method comprising:

[0257] - transmitting (701) to a wireless device or a User Equipment, UE:

[0258] ■ a configuration and / or indication of a CSI-RS or TRS resource, ■ a configuration, indication and / or scheduling of a DL channel (e.g., PDSCH or PDCCH) or RS (e.g., CSI-RS) transmission for which the source RS for the QCL assumption(s) is said CSI-RS or TRS resource, or a configuration, indication and / or scheduling of an UL channel (e.g., PLISCH or PLICCH) or RS (e.g., SRS) transmission, wherein the reference to compute or estimate the pathloss for calculation of an UL Tx power is said CSI-RS or TRS resource, and

[0259] ■ a PHY-, MAC or a higher layer signaling that updates or leads to an update of the TCI-State(s) or QCL assumption(s) of said CSI-RS or TRS resource; for enabling the UE to (702): apply said update of QCL assumption(s) or TCI-State(s) to said CSI-RS or TRS resource, at a predetermined or specified time instant after reception of said signaling, and determine or obtain value(s) of at least one of the following from said CSI-RS or TRS resource up to, at or before the application of said QCL assumption(s) or TCI-State(s): o channel parameter(s) at least corresponding to the QCL assumption(s) associated with said at least one DL channel or RS, o pathloss estimate(s), and use at least one of said determined or obtained values after the application of said QCL assumption(s) or TCI-State(s) to said CSI-RS or TRS resource for a specified or predetermined time duration ga, at least for one of the following purposes: o the reception of (port(s) of) said DL channel or RS, or o the determination of the transmit, Tx, power for the transmission of said UL channel or RS.

[0260] Referring to Figure 8, there is illustrated a method performed by a network node (1100) according to some of the previously described embodiments. The method comprising: transmitting (801) to a wireless device or a UE, a configuration and / or indication of a CSI-RS or TRS resource, a configuration, indication and / or scheduling of a DL channel (e.g., PDSCH or PDCCH) or RS (e.g., CSI-RS) transmission for which the source RS for the QCL assumption(s) is said CSI-RS or TRS resource, or a configuration, indication and / or scheduling of an UL channel (e.g., PUSCH or PUCCH) or RS (e.g., SRS) transmission, wherein the reference to compute or estimate the pathloss for calculation of an UL Tx power is said CSI-RS or TRS resource, a first PHY-, MAC or a higher layer signaling that deactivates said CSI-RS or TRS resource, and an indication along with said first signaling or via a different signaling that activates / reactivates said CSI-RS or TRS resource; for enabling (802) the UE to: determine or obtain value(s) of at least one of the following from said CSI-RS or TRS resource up to, at or before its deactivation: o channel parameter(s) at least corresponding to the QCL assumption(s) associated with said at least one DL channel or RS, o pathloss estimate(s), and use at least one of said determined or obtained value(s) after the deactivation of said CSI-RS or TRS resource for a specified or predetermined time duration ga, at least for one of the following purposes: o the reception of (port(s) of) said DL channel or RS, or o the determination of the Tx power for the transmission of said UL channel or RS.

[0261] Referring to Figure 9, there is illustrated a method performed by a network node (1100) according to some of the previously described embodiments. The method comprising: transmitting (901) to a user equipment (1000), o a configuration and / or indication indicating a first CSI-RS or TRS resource and a second CSI-RS or TRS resource, and wherein both first and second CSI-RS or TRS resource are configured for tracking with periodic or semi-persistent time-domain behavior, o a configuration, indication and / or scheduling of a DL channel or RS transmission for which the source RS for the QCL assumption(s) is said CSI-RS or TRS resource, or a configuration, indication and / or scheduling of an UL channel or RS transmission, wherein the reference to compute or estimate the pathloss for calculation of an UL Tx power is said first CSI-RS or TRS resource, o a first PHY-, MAC or a higher layer signaling that deactivates said first CSI-RS or TRS resource, and o an indication along with said first signaling or via a different signaling that activates said second CSI-RS or TRS resource; for enabling (902) the UE to update at least one QCL assumption for the reception of said DL channel or RS, or • a pathloss reference for said UL channel or RS, wherein the update is performed after the signaling that activates said second CSI-RS or TRS resource.

[0262] In order to perform the previously described process or method steps performed by the network node there is also provided a network node. Figure 11 illustrates a block diagram depicting a network node 1100. The network node 1100 comprises a processor 1110 or processing circuit or a processing module or a processor means 1110; a receiver circuit or receiver module 1140; a transmitter circuit or transmitter module 1150; a memory module 1120, a transceiver circuit or transceiver module 1130 which may include the transmitter circuit 1150 and the receiver circuit 1140. The network node 1100 further comprises an antenna system 1160 which includes antenna circuitry for transmitting and receiving signals to / from at least the wireless device. The antenna system employs beamforming as previously described.

[0263] The network node 1100 may belong to any radio access technology including 4G or LTE, LTE- A, 5G, advanced 5G or a combination thereof that support beamforming technology. The network device comprising the processor and the memory contains instructions executable by the processor, whereby the network node 1100 is operative or is configured to perform any one of the embodiments related to the network node 1100 as previously described.

[0264] The processing module / circuit 1110 includes a processor, microprocessor, an application specific integrated circuit (ASIC), field programmable gate array (FPGA), or the like, and may be referred to as the “processor.” The processor 1110 controls the operation of the network node and its components. Memory (circuit or module) 1120 includes a random-access memory (RAM), a read only memory (ROM), and / or another type of memory to store data and instructions that may be used by processor 1110. In general, it will be understood that the network node in one or more embodiments includes fixed or programmed circuitry that is configured to carry out the operations in any of the embodiments disclosed herein.

[0265] In at least one such example, the processor 1110 includes a microprocessor, microcontroller, DSP, ASIC, FPGA, or other processing circuitry that is configured to execute computer program instructions from a computer program stored in a non-transitory computer-readable medium that is in or is accessible to the processing circuitry. Here, “non-transitory” does not necessarily mean permanent or unchanging storage, and may include storage in working or volatile memory, but the term does connote storage of at least some persistence. The execution of the program instructions specially adapts or configures the processing circuitry to carry out the operations disclosed in this disclosure relating to the wireless device. Further, it will be appreciated that the wireless device 1100 may comprise additional components. The network node 1100 may also be viewed as a Transmitter and Receiver Point (TRP).

[0266] The network node 1100 by means of processor 1110 executes instructions contained in the memory 1120 whereby the network node 1100 is operative to perform any one of the previously described embodiments related to the actions performed by the network node, some of which are presented in some embodiments as described.

[0267] There is also provided a computer program comprising instructions which when executed by the processor 1110 of the network node cause the processor 1110 to carry out the method according to some embodiments as described.

[0268] According to some embodiments herein, a method performed by a wireless device or User Equipment, UE, is proposed, the method comprising:

[0269] • receiving from a network node, o a configuration and / or an indication of a channel state information reference signal, CSI-RS, or Tracking Reference Signal, TRS, resource, o a configuration and / or an indication and / or a scheduling of a downlink, DL, channel or a reference signal, RS, transmission for which a source RS for Quasi-Co- Located, QCL, assumption(s) is said CSI-RS or TRS resource, or a configuration and / or an indication and / or a scheduling of an uplink, UL, channel or RS transmission, wherein a reference for computing or estimating a pathloss for calculation of an UL transmit, Tx, power in said CSI-RS or TRS resource, and o a physical, PHY layer signaling, or a medium access control, MAC, layer signaling, or a higher layer signaling for updating or for leading to an update of one or more transmission configuration indication, TCI-State(s) or an update of QCL assumption(s) of said CSI-RS or TRS resource; the method further comprising:

[0270] • applying said update of said QCL assumption(s) or TCI-State(s) to said CSI-RS or TRS resource, at a predetermined or a specified time instant after reception of said signaling,

[0271] • determining or obtaining value(s) of at least one of the following from said CSI-RS or TRS resource up to, at or before an application of said QCL assumption(s) or TCI- State(s): o channel parameter(s) corresponding to said QCL assumption(s) associated with said at least one DL channel or RS, and o one or more pathloss estimate(s), and • using or applying at least one of said determined or obtained values after the application of said QCL assumption(s) or TCI-State(s) to said CSI-RS or TRS resource for a specified or predetermined time duration ga, at least for one of the following purposes: o a reception of (port(s) of) said DL channel or RS, or o a determination of a transmit, Tx, power for a transmission of said UL channel or RS.

[0272] According to some embodiments herein, the UE is configured to

[0273] • receive the PDCCH or MAC-CE message comprising at least the ID(s) of M < N TCI- State(s), and

[0274] • apply the m-th indicated TCI-State to an m-th CSI-RS resource or TRS resource with respect to an increasing order of the CSI-RS or TRS resource ID / index, wherein N CSI-RS or TRS resources are configured to the UE via a higher layer.

[0275] According to some embodiments herein, the UE is configured with N > M CSI-RS or TRS resources, and configured to

[0276] • receive a PDCCH or a MAC-CE message from a network node, wherein the PDCCH or the MAC-CE message indicates at least o the ID(s) of M > 1 synchronization signal block (SSB) resources, and / or o the ID(s) of M > 1 CSI-RS resources, and

[0277] • perform or apply a QCL assumption or association between o M configured CSI-RS or TRS resources and the M indicated SSB resources, and / or o M configured CSI-RS or TRS resources and the M indicated CSI-RS resources.

[0278] According to some embodiments herein, the QCL type used in the QCL assumption is provided in the PDCCH or MAC-CE message.

[0279] According to some embodiments herein, a method performed by a UE is proposed, the method comprising: receiving from a network node,

[0280] ■ a configuration and / or an indication of a CSI-RS or TRS resource,

[0281] ■ a configuration and / or an indication and / or a scheduling of a downlink, DL, channel or a reference signal, RS, transmission for which a source RS for Quasi- Co-Located, QCL, assumption(s) in said CSI-RS or TRS resource, or a configuration and / or an indication and / or a scheduling of an uplink, UL, channel or RS transmission, wherein a reference for computing or estimating a pathloss for calculation of an UL transmit, Tx, power is said CSI-RS or TRS resource,

[0282] ■ a first physical layer, PHY-, signaling, or a first MAC signaling or a first higher layer signaling for deactivating said CSI-RS or TRS resource, and

[0283] ■ an indication along with said first signaling or via a different signaling that activates or reactivates said CSI-RS or TRS resource; determining or obtaining value(s) of at least one of the following from said CSI-RS or TRS resource up to, at or before its deactivation: o one or more channel parameter(s) at least corresponding to the QCL assumption(s) associated with said at least one DL channel or RS, o pathloss estimate(s), and using or applying at least one of said determined or obtained value(s) after the deactivation of said CSI-RS or TRS resource for a specified or predetermined time duration ga, at least for one of the following purposes: o the reception of (port(s) of) said DL channel or RS, or o the determination of the Tx power for the transmission of said UL channel or RS.

[0284] According to some embodiments herein, the UE is configured to perform a reset of a determination, estimation, measurement or tracking of one or more channel parameters or pathloss from a CSI-RS or TRS resource / resource set at, before or after the application of an update of QCL assumption(s) or TCI-State(s) for said CSI-RS or TRS resource / resource set.

[0285] According to some embodiments herein, the reset of an estimation, measurement or tracking of a parameter from a reference signal, RS, resource involves at least one of the following: the tracking of the parameter from the RS resource is performed until a predetermined or specified time instance of reset and re-started thereafter, at least one value related to the estimate(s) or measurement(s) of said parameter from the RS resource is / are set to zero at, before or after a predetermined or specified time instance of reset, at least one value related to the history of estimate(s) or measurement(s) of said parameter from the RS resource is cleared or set to zero at, before or after a predetermined or specified time instance of reset. According to some embodiments herein, the UE is configured to use a previously determined, estimated, tracked or computed value of a channel parameter from a CSI-RS or TRS resource for the reception of a DL channel or RS, or the computation of a Tx power of a UL channel or RS, starting from one of the following time instances, labeled ts. the time instance of application of a TCI-State or QCL assumption for the CSI-RS resource or TRS resource, or the time instance of deactivation or activation of the CSI-RS or TRS resource, or the instance of reset of estimation / tracking of said parameter, or an instance after the reset of estimation / tracking of said parameter, until a predetermined or specified instance of time, labeled te, that occurs after one of the above instances, wherein said previous value of the channel parameter is determined / estimated / computed / tracked before ts.

[0286] According to some embodiments herein, the UE is configured to use a value of a channel parameter estimated or computed from a CSI-RS or TRS resource between time instances tsand te, or at te, for the reception of a DL channel or RS, or for the computation of a Tx power of a UL channel or RS after time instance te.

[0287] According to some embodiments herein, the duration between tsand teis fixed in the NR specifications, i.e. , it is known to the UE.

[0288] According to some embodiments herein, the duration between tsand teis given by ga.

[0289] According to some embodiments herein, the UE is configured to apply a current or latest value of a parameter determined, estimated or computed from a CSI-RS or TRS resource for the reception of said DL channel or RS, or for the computation of a Tx power of said UL channel or RS after time instance te.

[0290] According to some embodiments herein, said CSI-RS or TRS resource(s) / resource set is configured

[0291] • for tracking (for e.g., CSI-RS resource / resource set configured with parameter ‘trslnfo’ or TRS resource set configured using ‘trs-ResourceSetConfig’), and / or with periodic or semi-persistent time-domain behavior.

[0292] According to some embodiments herein, the TCI-State(s) or QCL assumption(s) is / are applied by the UE to CSI-RS / TRS resource(s) / resource set(s) at least after gslots> 0 slots or gms> 0 ms after at least one of the following events:

[0293] • the reception of the PHY-, MAC or higher layer signaling which o provides the TCI-State(s) or QCL assumption(s) for said CSI-RS / TRS resource(s) / resource set(s), or o activates said CSI-RS / TRS resource(s) / resource set(s),

[0294] • the transmission of an acknowledgement (for e.g., Hybrid Automatic Repeat Request, HARQ, Acknowledgement, ACK, message) corresponding to the PDSCH / PDCCH that comprises the PHY-, MAC or higher-layer signaling which o provides the TCI-State(s) or QCL assumption(s) for said CSI-RS / TRS resource(s) / resource set(s), or o activates said CSI-RS / TRS resource(s) / resource set(s).

[0295] According to some embodiments herein, the UE is configured to use one or more channel parameters determined, estimated, measured or tracked up to, at or before the deactivation of said CSI-RS or TRS resource / resource set for a predetermined or specified duration that starts at gp> 0 slots / symbols / ms after at least one of the following: the deactivation of said CSI-RS or TRS resource / resource set, the reactivation / activation of said CSI-RS or TRS resource / resource set, and ends gq> 0 slots / symbols / ms after the reactivation of said CSI-RS or TRS resource / resource set. In certain examples, gp> 0.

[0296] According to some embodiments herein, a MAC-CE message or a PDCCH indicates the deactivation and the reactivation / activation of the CSI-RS resource / resource set.

[0297] According to some embodiments herein, a method performed by a user equipment is proposed, the method comprising:

[0298] • receiving from a network node: o a configuration and / or indication indicating a first CSI-RS or TRS resource and a second CSI-RS or TRS resource, and wherein both first and second CSI-RS or TRS resource are configured for tracking with periodic or semi-persistent timedomain behavior, o a configuration, indication and / or scheduling of a DL channel or RS transmission for which the source RS for the QCL assumption(s) is said CSI-RS or TRS resource, or a configuration, indication and / or scheduling of an UL channel or RS transmission, wherein the reference to compute or estimate the pathloss for calculation of an UL Tx power is said first CSI-RS or TRS resource, o a first PHY-, MAC or a higher layer signaling that deactivates said first CSI-RS or TRS resource, and o an indication along with said first signaling or via a different signaling that activates said second CSI-RS or TRS resource; and

[0299] • updating o at least one QCL assumption for the reception of said DL channel or RS, or o a pathloss reference for said UL channel or RS, wherein the update is performed after the signalling that activates said second CSI-RS or TRS resource.

[0300] According to some embodiments herein, the UE is configured to update: at least one QCL assumption for the reception of (port(s) of) said DL channel or RS wherein said second CSI-RS or TRS resource or a resource from said second CSI-RS or TRS resource set is updated as the QCL source, or a pathloss reference for said UL channel or RS wherein said second CSI-RS or TRS resource or a resource from said second CSI-RS or TRS resource set is updated as pathloss reference.

[0301] According to some embodiments herein, the UE is configured to assume a DL channel / RS is QCL-ed with the deactivated first CSI-RS or TRS resource or a resource from the resource set, or obtain a pathloss estimate / measurement for an UL channel or RS transmission from the deactivated first CSI-RS or TRS resource or a resource from the resource set, during at least one of the following instances: a predetermined or specified duration after the deactivation of said first CSI-RS or TRS resource / resource set, or a predetermined or a specified duration after the activation of said second CSI-RS or TRS resource / resource set. According to some embodiments herein, the UE is configured to assume QCL or use the pathloss estimate(s) from the deactivated first CSI-RS or TRS resource / resource set for a predetermined or specified duration that starts at > 0 slots / symbols / ms after the deactivation of said first CSI-RS or TRS resource / resource set and ends g2> 0 slots / symbols / ms after the activation of said first or second CSI-RS or TRS resource / resource set, wherein g , g2and / or the duration between them is / are provided by the specifications.

[0302] According to some embodiments herein, the UE is configured to receive an indication of one or more TCI-States or QCL assumptions along with a PHY, MAC or higher layer signaling that activates a CSI-RS or TRS resource or resource set, and apply said one or more TCI-States or QCL assumptions to said activated CSI-RS or TRS resource or resource set.

[0303] According to some embodiments herein, said DL channel or RS is PDSCH, PDCCH or CSI- RS, and said UL channel or RS is PUSCH, PUCCH or SRS.

[0304] According to some embodiments herein, a method performed by a network node is proposed, the method comprising, transmitting to a user equipment,

[0305] ■ a configuration and / or indication of a CSI-RS or TRS resource,

[0306] ■ a configuration, indication and / or scheduling of a DL channel (e.g., PDSCH or PDCCH) or RS (e.g., CSI-RS) transmission for which the source RS for the QCL assumption(s) is said CSI-RS or TRS resource, or a configuration, indication and / or scheduling of an UL channel (e.g., PUSCH or PUCCH) or RS (e.g., SRS) transmission, wherein the reference to compute or estimate the pathloss for calculation of an UL Tx power is said CSI-RS or TRS resource, and

[0307] ■ a PHY-, MAC or a higher layer signaling that updates or leads to an update of the TCI-State(s) or QCL assumption(s) of said CSI-RS or TRS resource; for enabling the UE to apply said update of QCL assumption(s) or TCI-State(s) to said CSI-RS or TRS resource, at a predetermined or specified time instant after reception of said signaling, and determine or obtain value(s) of at least one of the following from said CSI-RS or TRS resource up to, at or before the application of said QCL assumption(s) or TCI-State(s): o channel parameter(s) at least corresponding to the QCL assumption(s) associated with said at least one DL channel or RS, o pathloss estimate(s), and use at least one of said determined or obtained values after the application of said QCL assumption(s) or TCI-State(s) to said CSI-RS or TRS resource for a specified or predetermined time duration ga, at least for one of the following purposes: o the reception of (port(s) of) said DL channel or RS, or o the determination of the transmit, Tx, power for the transmission of said UL channel or RS.

[0308] According to some embodiments herein, a method performed by a network node is proposed, the method comprising, transmitting to a user equipment, a configuration and / or indication of a CSI-RS or TRS resource, a configuration, indication and / or scheduling of a DL channel (e.g., PDSCH or PDCCH) or RS (e.g., CSI-RS) transmission for which the source RS for the QCL assumption(s) is said CSI-RS or TRS resource, or a configuration, indication and / or scheduling of an UL channel (e.g., PUSCH or PUCCH) or RS (e.g., SRS) transmission, wherein the reference to compute or estimate the pathloss for calculation of an UL Tx power is said CSI-RS or TRS resource, a first PHY-, MAC or a higher layer signaling that deactivates said CSI-RS or TRS resource, and an indication along with said first signaling or via a different signaling that activates / reactivates said CSI-RS or TRS resource; for enabling the UE to determine or obtain value(s) of at least one of the following from said CSI-RS or TRS resource up to, at or before its deactivation: o channel parameter(s) at least corresponding to the QCL assumption(s) associated with said at least one DL channel or RS, o pathloss estimate(s), and use at least one of said determined or obtained value(s) after the deactivation of said CSI-RS or TRS resource for a specified or predetermined time duration ga, at least for one of the following purposes: o the reception of (port(s) of) said DL channel or RS, or the determination of the Tx power for the transmission of said UL channel or RS. According to some embodiments herein, a method performed by a network node is proposed, the method comprising, transmitting to a user equipment, o a configuration and / or indication indicating a first CSI-RS or TRS resource and a second CSI-RS or TRS resource, and wherein both first and second CSI-RS or TRS resource are configured for tracking with periodic or semi-persistent time-domain behavior, o a configuration, indication and / or scheduling of a DL channel or RS transmission for which the source RS for the QCL assumption(s) is said CSI-RS or TRS resource, or a configuration, indication and / or scheduling of an UL channel or RS transmission, wherein the reference to compute or estimate the pathloss for calculation of an UL Tx power is said first CSI-RS or TRS resource, o a first PHY-, MAC or a higher layer signaling that deactivates said first CSI-RS or TRS resource, and o an indication along with said first signaling or via a different signaling that activates said second CSI-RS or TRS resource; for enabling the UE to update

[0309] • at least one QCL assumption for the reception of said DL channel or RS, or

[0310] • a pathloss reference for said UL channel or RS, wherein the update is performed after the signaling that activates said second CSI-RS or TRS resource.

[0311] Several advantages of the described embodiments in this disclosure are achieved as previously described and which include significantly reducing the feedback overhead and the computational complexity at the wireless device for enhancements on tracking reference signals.

[0312] Reference throughout this specification to “an example” or “exemplary” means that a particular feature, structure, or characteristic described in connection with the example is included in at least one embodiment of the present technology. Thus, appearances of the phrases “in an example” or the word “exemplary” in various places throughout this specification are not necessarily all referring to the same embodiment.

[0313] In this disclosure, the term “PHY layer signaling” may refer to a signaling received via the PHY layer, for e.g., via a PDCCH or PDSCH. The PDCCH may comprise a DCI that provides said signaling. In this disclosure, the term “MAC layer signaling” may refer to a signaling received via the MAC layer, for e.g., a MAC Control Element (MAC-CE) message.

[0314] In this disclosure, the term “higher layer signaling”, in some cases, may refer to a signaling received via the RRC layer. It may refer to a configuration obtained via a RRC layer.

[0315] Throughout this disclosure, the word "comprise" or “comprising” has been used in a nonlimiting sense, i.e. meaning "consist at least of". Although specific terms may be employed herein, they are used in a generic and descriptive sense only and not for purposes of limitation. The embodiments herein may be applied in any wireless systems including LTE or 4G, LTE- A (or LTE-Advanced), 5G, advanced 5G, WiMAX, WiFi, satellite communications, TV broadcasting etc.

Claims

CLAIMS1 . A method performed by a wireless device or a User Equipment, UE, the method comprising:• receiving from a network node, o a configuration and / or an indication of a channel state information reference signal, CSI-RS, or Tracking Reference Signal, TRS, resource, o a configuration and / or an indication and / or a scheduling of a downlink, DL, channel or a reference signal, RS, transmission for which a source RS for Quasi-Co- Located, QCL, assumption(s) is said CSI-RS or TRS resource, or a configuration and / or an indication and / or a scheduling of an uplink, UL, channel or RS transmission, wherein a reference for computing or estimating a pathloss for calculation of an UL transmit, Tx, power in said CSI-RS or TRS resource, and o a physical, PHY layer signaling, or a medium access control, MAC, layer signaling, or a higher layer signaling for updating or for leading to an update of one or more transmission configuration indication, TCI-State(s) or an update of QCL assumption(s) of said CSI-RS or TRS resource; the method further comprising:• applying said update of said QCL assumption(s) or TCI-State(s) to said CSI-RS or TRS resource, at a predetermined or a specified time instant after reception of said signaling,• determining or obtaining value(s) of at least one of the following from said CSI-RS or TRS resource up to, at or before an application of said QCL assumption(s) or TCI- State(s): o channel parameter(s) corresponding to said QCL assumption(s) associated with said at least one DL channel or RS, and o one or more pathloss estimate(s), and• using or applying at least one of said determined or obtained values after the application of said QCL assumption(s) or TCI-State(s) to said CSI-RS or TRS resource for a specified or predetermined time duration ga, at least for one of the following purposes: o a reception of (port(s) of) said DL channel or RS, or o a determination of a transmit, Tx, power for a transmission of said UL channel or RS.

2. The method according to claim 1 comprising:- receiving a physical downlink control channel, PDCCH or a medium access control - control element, MAC-CE, message comprising identifiers ID(s) of M < N TCI-State(s), and- applying an m-th indicated TCI-State to an m-th CSI-RS resource or TRS resource with respect to an increasing order of the CSI-RS or TRS resource ID, wherein N CSI- RS or TRS resources are configured to the UE via a higher layer, and m = 0, ..., M - 1,3. The method according to claim 1 or claim 2, wherein the UE is configured with N > M CSI- RS or TRS resources, and the method further comprises:- receiving a PDCCH or a MAC-CE message from the network node, wherein the PDCCH or the MAC-CE message indicates at least:- ID(s) of M > 1 synchronization signal block (SSB) resources, and / or- D(s) of M > 1 CSI-RS resources, and- performing or applying a QCL assumption or association between: o M configured CSI-RS or TRS resources and the M indicated synchronization signal block, SSB, resources, and / or o M configured CSI-RS or TRS resources and the M indicated CSI-RS resources.

4. The method according to claim 3, wherein a QCL type used in the QCL assumption is provided in the PDCCH or MAC-CE message.

5. A method performed by a wireless device or a User Equipment, UE, the method comprising: receiving from a network node,■ a configuration and / or an indication of a CSI-RS or TRS resource,■ a configuration and / or an indication and / or a scheduling of a downlink, DL, channel or a reference signal, RS, transmission for which a source RS for Quasi- Co-Located, QCL, assumption(s) in said CSI-RS or TRS resource, or a configuration and / or an indication and / or a scheduling of an uplink, UL, channel or RS transmission, wherein a reference for computing or estimating a pathloss for calculation of an UL transmit, Tx, power is said CSI-RS or TRS resource,■ a first physical layer, PHY-, signaling, or a first MAC signaling or a first higher layer signaling for deactivating said CSI-RS or TRS resource, and■ an indication along with said first signaling or via a different signaling that activates or reactivates said CSI-RS or TRS resource; determining or obtaining value(s) of at least one of the following from said CSI-RS or TRS resource up to, at or before its deactivation: o one or more channel parameter(s) at least corresponding to the QCL assumption(s) associated with said at least one DL channel or RS, o pathloss estimate(s), and using or applying at least one of said determined or obtained value(s) after the deactivation of said CSI-RS or TRS resource for a specified or predetermined time duration ga, at least for one of the following purposes: o the reception of (port(s) of) said DL channel or RS, or o the determination of the Tx power for the transmission of said UL channel or RS.

6. The method according to claims 1-4 or claim 5 comprising: performing a reset of a determination, estimation, measurement or tracking of one or more channel parameters or pathloss from a CSI-RS or TRS resource / resource set at, before or after the application of an update of QCL assumption(s) or TCI-State(s) for said CSI-RS or TRS resource / resource set.

7. The method according to claim 6 wherein, the reset of an estimation, measurement or tracking of a parameter from a reference signal, RS, resource involves at least one of the following: a tracking of the parameter from the RS resource is performed until a predetermined or specified time instance of reset and re-started thereafter, at least one value related to the estimate(s) or measurement(s) of said parameter from the RS resource is / are set to zero at, before or after a predetermined or specified time instance of reset, at least one value related to the history of estimate(s) or measurement(s) of said parameter from the RS resource is cleared or set to zero at, before or after a predetermined or specified time instance of reset.

8. The method according to anyone of claims 1-4 or claims 5-7 wherein, the UE is configured to use a previously determined, estimated, tracked, or computed value of a channel parameter from a CSI-RS or TRS resource for a reception of a DL channel or RS, or a computation of a Tx power of a UL channel or RS, starting from one of the following time instances, labeled ts. a time instance of application of a TCI-State or QCL assumption for the CSI-RS resource or TRS resource, or a time instance of deactivation or activation of the CSI-RS or TRS resource, or an instance of reset of estimation / tracking of said parameter, or an instance after the reset of estimation / tracking of said parameter, until a predetermined or specified instance of time, labeled te, that occurs after one of the above instances, wherein said previous value of the channel parameter is determined / estimated / computed / tracked before ts.

9. The method according to claim 8 wherein, the UE is configured to use a value of a channel parameter estimated or computed from a CSI-RS or TRS resource between time instances tsand te, or- at te, for a reception of a DL channel or RS, or for the computation of a Tx power of a UL channel or RS after time instance te.

10. The method according to claim 8 or 9 wherein, a duration between tsand teis fixed to a specific value in the new radio, NR, specifications.

11. The method according to anyone of claims 8-10, wherein, the duration between tsand teis given by ga.

12. The method according to anyone of claims 8-11 , wherein, the UE is configured to apply a current or latest value of a parameter determined, estimated or computed from a CSI-RS or TRS resource for the reception of said DL channel or RS, or for the computation of a Tx power of said UL channel or RS after time instance te.

13. The method according to anyone of the preceding claims, wherein, said CSI-RS or TRS resource(s) / resource set is configured• for tracking (for e.g., CSI-RS resource / resource set configured with a parameter ‘trslnfo’ or TRS resource set configured using ‘trs-ResourceSetConfig’), and / or• with periodic or semi-persistent time-domain behavior.

14. The method according to anyone of claims 1-4 or 5-13, wherein, said TCI-State(s) or QCL assumption(s) is / are applied by the UE to CSI-RS / TRS resource(s) / resource set(s) at least after gslots> 0 slots or gms> 0 ms after at least one of the following events:• the reception of the PHY-, MAC or higher layer signaling which o provides the TCI-State(s) or QCL assumption(s) for said CSI-RS / TRS resource(s) / resource set(s), or o activates said CSI-RS / TRS resource(s) / resource set(s),• the transmission of an acknowledgement (for e.g., Hybrid Automatic Repeat Request, HARQ, Acknowledgement, ACK, message) corresponding to the PDSCH / PDCCH that comprises the PHY-, MAC or higher-layer signaling which o provides the TCI-State(s) or QCL assumption(s) for said CSI-RS / TRS resource(s) / resource set(s), or o activates said CSI-RS / TRS resource(s) / resource set(s).

15. The method according to anyone of claims 1-4 or 5-14 wherein, the UE is configured to use one or more channel parameters determined, estimated, measured or tracked up to, at or before the deactivation of said CSI-RS or TRS resource / resource set for a predetermined or specified duration that starts at gp> 0 slots / symbols / ms after at least one of the following: a deactivation of said CSI-RS or TRS resource / resource set, a reactivation / activation of said CSI-RS or TRS resource / resource set, and ends gq> 0 slots / symbols / ms after the reactivation of said CSI-RS or TRS resource / resource set.

16. The method according to anyone of claims 5-15 wherein, a MAC-CE message or a PDCCH indicates a deactivation and a reactivation / activation of the CSI-RS resource / resource set.

17. A method performed by a wireless device or a User Equipment, UE, the method comprising:• receiving from a network node: o a configuration and / or indication indicating a first CSI-RS or TRS resource and a second CSI-RS or TRS resource, and wherein both first and second CSI-RS or TRS resource are configured for tracking with periodic or semi-persistent timedomain behavior, o a configuration, indication and / or scheduling of a DL channel or RS transmission for which the source RS for the QCL assumption(s) is said CSI-RS or TRS resource, or a configuration, indication and / or scheduling of an UL channel or RS transmission, wherein the reference to compute or estimate the pathloss for calculation of an UL Tx power is said first CSI-RS or TRS resource, o a first PHY-, MAC or a higher layer signaling that deactivates said first CSI-RS or TRS resource, and o an indication along with said first signaling or via a different signaling that activates said second CSI-RS or TRS resource; and• updating o at least one QCL assumption for the reception of said DL channel or RS, or o a pathloss reference for said UL channel or RS, wherein the update is performed after the signalling that activates said second CSI-RS or TRS resource.

18. The method according to claim 17 wherein, the UE is configured to update: at least one QCL assumption for the reception of (port(s) of) said DL channel or RS wherein said second CSI-RS or TRS resource or a resource from said second CSI-RS or TRS resource set is updated as the QCL source, or a pathloss reference for said UL channel or RS wherein said second CSI-RS or TRS resource or a resource from said second CSI-RS or TRS resource set is updated as pathloss reference.

19. The method according to claim 17 or 18 wherein, the UE is configured to- assume a DL channel / RS is QCL-ed with the deactivated first CSI-RS or TRS resource or a resource from the resource set, or- obtain a pathloss estimate / measurement for an UL channel or RS transmission from the deactivated first CSI-RS or TRS resource or a resource from the resource set, during at least one of the following instances: a predetermined or specified duration after the deactivation of said first CSI-RS or TRS resource / resource set, or a predetermined or a specified duration after the activation of said second CSI-RS or TRS resource / resource set.

20. The method according to anyone of claims 17-19 wherein, the UE is configured to assume a QCL or use the pathloss estimate(s) from the deactivated first CSI-RS or TRS resource / resource set for a predetermined or specified duration that starts at> 0 slots / symbols / ms after the deactivation of said first CSI-RS or TRS resource / resource set and ends g2> 0 slots / symbols / ms after the activation of said first or second CSI-RS or TRS resource / resource set, wherein g , g2and / or the duration between them is / are provided by the NR specifications.

21. The method according to anyone of claims 17-20 wherein, the UE is configured to receive an indication of one or more TCI-States or QCL assumptions along with a PHY, MAC or higher layer signaling that activates a CSI-RS or TRS resource or resource set, and apply said one or more TCI-States or QCL assumptions to said activated CSI-RS or TRS resource or resource set.

22. The method according to anyone of claims 1-4, 5-16 or 17-21 , wherein, said DL channel or RS is PDSCH, PDCCH or CSI-RS, and said UL channel or RS is PUSCH, PUCCH or SRS.

23. A method performed by a network node, the method comprising,- transmitting to a wireless device or a User Equipment, UE:■ a configuration and / or indication of a CSI-RS or TRS resource,■ a configuration, indication and / or scheduling of a DL channel (e.g., PDSCH or PDCCH) or RS (e.g., CSI-RS) transmission for which the source RS for the QCL assumption(s) is said CSI-RS or TRS resource, or a configuration, indicationand / or scheduling of an UL channel (e.g., PLISCH or PLICCH) or RS (e.g., SRS) transmission, wherein the reference to compute or estimate the pathloss for calculation of an UL Tx power is said CSI-RS or TRS resource, and■ a PHY-, MAC or a higher layer signaling that updates or leads to an update of the TCI-State(s) or QCL assumption(s) of said CSI-RS or TRS resource; for enabling the UE to apply said update of QCL assumption(s) or TCI-State(s) to said CSI-RS or TRS resource, at a predetermined or specified time instant after reception of said signaling, and determine or obtain value(s) of at least one of the following from said CSI-RS or TRS resource up to, at or before the application of said QCL assumption(s) or TCI-State(s): o channel parameter(s) at least corresponding to the QCL assumption(s) associated with said at least one DL channel or RS, o pathloss estimate(s), and use at least one of said determined or obtained values after the application of said QCL assumption(s) or TCI-State(s) to said CSI-RS or TRS resource for a specified or predetermined time duration ga, at least for one of the following purposes: o the reception of (port(s) of) said DL channel or RS, or o the determination of the transmit, Tx, power for the transmission of said UL channel or RS.

24. A method performed by a network node, the method comprising, transmitting to a user equipment, a configuration and / or indication of a CSI-RS or TRS resource, a configuration, indication and / or scheduling of a DL channel (e.g., PDSCH or PDCCH) or RS (e.g., CSI-RS) transmission for which the source RS for the QCL assumption(s) is said CSI-RS or TRS resource, or a configuration, indication and / or scheduling of an UL channel (e.g., PUSCH or PUCCH) or RS (e.g., SRS) transmission, wherein the reference to compute or estimate the pathloss for calculation of an UL Tx power is said CSI-RS or TRS resource, a first PHY-, MAC or a higher layer signaling that deactivates said CSI-RS or TRS resource, and an indication along with said first signaling or via a different signaling that activates / reactivates said CSI-RS or TRS resource;for enabling the UE to determine or obtain value(s) of at least one of the following from said CSI-RS or TRS resource up to, at or before its deactivation: o channel parameter(s) at least corresponding to the QCL assumption(s) associated with said at least one DL channel or RS, o pathloss estimate(s), and use at least one of said determined or obtained value(s) after the deactivation of said CSI-RS or TRS resource for a specified or predetermined time duration ga, at least for one of the following purposes: s o the reception of (port(s) of) said DL channel or RS, or o the determination of the Tx power for the transmission of said UL channel or RS.

25. A method performed by a network node, the method comprising, transmitting to a user equipment, or a wireless device: o a configuration and / or indication indicating a first CSI-RS or TRS resource and a second CSI-RS or TRS resource, and wherein both first and second CSI-RS or TRS resource are configured for tracking with periodic or semi-persistent time-domain behavior, o a configuration, indication and / or scheduling of a DL channel or RS transmission for which the source RS for the QCL assumption(s) is said CSI-RS or TRS resource, or a configuration, indication and / or scheduling of an UL channel or RS transmission, wherein the reference to compute or estimate the pathloss for calculation of an UL Tx power is said first CSI-RS or TRS resource, o a first PHY-, MAC or a higher layer signaling that deactivates said first CSI-RS or TRS resource, and o an indication along with said first signaling or via a different signaling that activates said second CSI-RS or TRS resource; for enabling the UE to update• at least one QCL assumption for the reception of said DL channel or RS, or• a pathloss reference for said UL channel or RS, wherein the update is performed after the signaling that activates said second CSI-RS or TRS resource.

26. A wireless device (1000) or a UE comprising a processor (1010) and a memory (1020) containing instructions executable by said processor (1010), whereby the wireless device (1000) is operative to perform anyone of the subject matter of anyone of claims1-22.

27. A network node (1100) comprising a processor (1110) and a memory (1120) containing instructions executable by said processor (1110), whereby the network node (1100) is operative to perform anyone of the subject matter of anyone of claims claim 23-25.

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