System and method for determining beam state of a downlink signal in a link recovery procedure - Patents.com

Abstract

A system and method are disclosed for simultaneously updating beam information and power control for channels and reference signals in downlink signaling and uplink signaling after receiving a base station response in a link recovery procedure. In one embodiment, an exemplary wireless communication method includes receiving, by a wireless communication device, a response for link recovery from a wireless communication node, and determining, by the wireless communication device according to the downlink reference signal, a beam state of the downlink signal, a defined number of time units after receiving the response for link recovery.

Description

[Technical field]

[0001] The present disclosure relates generally to wireless communications, and more particularly to a system and method for determining beam states of a downlink signal in a link recovery procedure. [Background technology]

[0002] In 5G New Radio Access Technology (NR), analog beamforming is introduced into mobile networks to enhance the robustness of high frequency (e.g., above 6 GHz) communications. However, directional transmission under analog beamforming limits multipath diversity and makes high frequency communications vulnerable to channel variations (e.g., human or vehicular interference). Summary of the Invention [Means for solving the problem]

[0003] The exemplary implementations disclosed herein are intended to solve one or more problems associated with the prior art and provide additional features that will be readily apparent by reference to the following detailed description in conjunction with the accompanying drawings. According to various implementations, exemplary systems, methods, devices, and computer program products are disclosed herein. However, these implementations are presented by way of example and not limitation, and it will be apparent to those skilled in the art upon reading this disclosure that various modifications to the disclosed implementations can be made while remaining within the scope of this disclosure.

[0004] In one implementation, a method performed by a wireless communication device includes receiving, by the wireless communication device, a response for link recovery from a wireless communication node, and determining, by the wireless communication device according to a downlink reference signal, a beam state of the downlink signal, a defined number of time units after receiving the response for link recovery.

[0005] The method includes at least one of: the downlink RS is indicated by random access preamble signaling or medium access control-control element (MAC-CE) signaling, or the downlink RS is from a set of candidate RSs associated with the downlink signal.

[0006] The method includes determining, by the wireless communication device, a beam state of an uplink signal according to a last occurring physical random access channel (PRACH) transmission or a downlink RS.

[0007] A method, wherein at least one of a beam state of an uplink signal or a beam state of a downlink signal comprises a spatial filter, and for a primary cell (PCell), the beam state of the uplink signal is determined according to a most recently occurred PRACH transmission, and for a secondary cell (SCell) or a cell having at least one of two or more RS sets or two or more candidate RS sets for beam failure detection, the beam state of the uplink signal is determined according to a downlink RS, or the beam state of the uplink signal is determined according to a downlink RS from a set of candidate RSs associated with the uplink signal.

[0008] The method, wherein the downlink signal includes at least one of a physical downlink control channel (PDCCH), a physical downlink shared channel (PDSCH), or a channel state information reference signal (CSI-RS).

[0009] The method includes the uplink signal including at least one of a physical uplink control channel (PUCCH), a physical uplink shared channel (PUSCH), or a sounding reference signal (SRS).

[0010] The method includes determining, by the wireless communication device, a power control parameter of the uplink signal, the power control parameter including at least one of a path loss RS, an open loop parameter, or a closed loop index.

[0011] The method includes determining, by the wireless communication device, a path loss RS according to a downlink RS or a downlink RS from a set of candidate RSs associated with the downlink signal.

[0012] The method includes determining, by the wireless communication device, open-loop parameters according to an open-loop parameter having a specific index, where at least one of: the specific index is zero, a minimum or first value, or a maximum or last value; the open-loop parameter includes at least one of a target power or a coefficient; the open-loop parameter having the specific index is from a group associated with the uplink signal; or the specific index is determined according to group information or a type of a control resource set (CORESET) of the uplink signal.

[0013] The method, wherein when the uplink signal is associated with group information having an index of Y or a Yth type of control resource set (CORESET), the method further includes at least one of: determining, by the wireless communication device, open-loop parameters according to an open-loop parameter having a particular index, the particular index being Y or Y-1; or determining, by the wireless communication device, the open-loop parameters according to an open-loop parameter having a Yth lowest index, a Yth index, a Yth highest index, or a Yth last index.

[0014] The method includes determining, by the wireless communication device, a closed-loop index according to a specific value, the specific value being zero, a minimum or first value, or a maximum or last value; a closed-loop index of the UL signal is determined according to group information associated with the uplink signal or a type of a control resource set (CORESET) of the uplink signal; a closed-loop value associated with the closed-loop index is reset; or a closed-loop value associated with the closed-loop index is determined according to at least one of a ramp-up value of a physical random access channel (PRACH) transmission, a transmit power control (TPC) command in downlink control information (DCI) signaling carrying a response for link recovery, or a TPC command in DCI signaling associated with the uplink signal.

[0015] The method includes placing at least one of the downlink signal or the uplink signal in a component carrier (CC) in a CC list or a bandwidth portion (BWP) in a BWP list.

[0016] The method includes determining, by the wireless communication device, a CC list, where the CC list is determined as including one or more CCs for which one or more beam states are indicated simultaneously for one or more downlink or uplink signals by one signaling, or the CC list is determined as including one or more CCs for which one or more beam states are applied simultaneously to one or more downlink or uplink signals in accordance with Radio Resource Control (RRC) parameters for indicating the CC list, or the CC list is determined in accordance with RRC parameters for indicating a CC list with simultaneous spatial relationship or spatial filter update for the uplink signal.

[0017] The method includes determining, by the wireless communication device, a beam state of a downlink signal in a first component carrier (CC) or a first bandwidth portion (BWP) according to a second downlink RS associated with the downlink RS, where at least one of: the second downlink RS and the downlink signal are in the first CC or first BWP, the second downlink RS is associated with the downlink RS via a radio resource control (RRC) configuration or a medium access control-control element (MAC-CE) command, the second downlink RS and the downlink RS have the same RS index, the second downlink RS is determined according to at least one of an RS index of the downlink RS or an offset configured via RRC or medium access control-control element (MAC-CE) signaling, or the second downlink RS corresponds to a quasi-co-location (QCL) type assumption.

[0018] A method, wherein the number of defined time units is at least one of 28, determined according to a radio resource control (RRC) configured for beam state updates, or an RRC configuration associated with a component carrier (CC) or bandwidth portion (BWP) carrying a response for link recovery.

[0019] A method, in which a subcarrier spacing (SCS) corresponding to a defined number of time units is determined according to at least one of: a minimum of one or more SCSs for one or more component carriers (CCs) or bandwidth portions (BWPs) with link failure and a CC or BWP carrying a response for link recovery, a minimum of one or more SCSs for one or more CCs or BWPs with link failure, or a minimum of one or more SCSs for one or more CCs or BWPs in a CC list determined according to a radio resource control (RRC) parameter to indicate a CC list with simultaneous updating of beam state.

[0020] A method, wherein the number of defined time units is determined according to at least one of a component carrier (CC) or bandwidth portion (BWP) having a minimum of one or more SCS values ​​for one or more CCs or BWPs with link failure and a CC or BWP carrying a response for link recovery, a CC or BWP having a minimum of one or more SCS values ​​for one or more CCs or BWPs with link failure, or a CC or BWP having a minimum of one or more SCS values ​​for one or more CCs or BWPs in a CC list determined according to a radio resource control (RRC) parameter to indicate a CC list with simultaneous updating of beam state.

[0021] The method further includes determining, by the wireless communication device according to the downlink RS, a beam state of the downlink signal starting from a first slot a defined number of time units after receiving a response for link recovery, the first slot being determined according to at least one of a component carrier (CC) or bandwidth portion (BWP) carrying the response for link recovery, or one or more CCs or BWPs with link failure.

[0022] The method further includes determining, by the wireless communication device, a beam state of the uplink signal according to a downlink RS starting from a last occurring physical random access channel (PRACH) transmission or a first slot a defined number of time units after receiving a response for link recovery, where the first slot is determined according to at least one of a component carrier (CC) or bandwidth portion (BWP) carrying the response for link recovery, or one or more CCs or BWPs in which there is a link failure.

[0023] The method, wherein after receiving a response for link recovery, one or more previously generated channel state information (CSI) reports are withdrawn; or, a control resource set (CORESET) of the same type corresponds to the same CORESET pool identifier (ID) or is not configured with a CORESET pool ID.

[0024] A method, wherein a downlink or uplink signal and a set of candidate RSs associated with the downlink or uplink signal are associated with a type of group information or control resource set (CORESET).

[0025] The method further comprises at least one of: the group information includes information grouping one or more RSs, a resource set, a beam state set, a panel, a subarray, an antenna group, an antenna port group, a group of antenna ports, a beam group, a physical cell index (PCI), a transmission receiving point (TRP) index, a CORESET pool identifier (ID), or a set of capabilities of the wireless communication device; the resource set includes an RS set for beam failure detection; or the capability set includes a number of antenna ports or a number of layers.

[0026] 11. The method, wherein the type of group information or CORESET is associated with at least one of a transmission configuration indicator (TCI) state or group of TCI states, a CORESET or physical downlink control channel (PDCCH), a first type of physical downlink shared channel (PDSCH), a configuration grant (CG) PDSCH, a physical uplink control channel (PUCCH) resource or group of PUCCH resources, a first type of physical uplink shared channel (PUSCH), a CG PUSCH, a channel state information RS (CSI-RS) or group of CSI-RS, or a sounding RS (SRS) resource or group of SRS.

[0027] A method, wherein a CORESET is comprised of group information or a CORESET pool identifier (ID).

[0028] 13. A method, comprising at least one of: a first type of PDSCH is scheduled by a first CORESET or a first PDCCH, and the first CORESET or a CORESET associated with the first PDCCH is associated with group information; or corresponds to a type of CORESET, and the type of group information or CORESET is configured in a radio resource control (RRC) configuration for a CG PDSCH; or a CG PDSCH is initiated by a second CORESET or a second PDCCH, and the second CORESET or a CORESET associated with the second PDCCH is associated with group information or corresponds to a type of CORESET.

[0029] 13. A method, comprising at least one of: a first type of PUSCH is scheduled by a first CORESET or a first PDCCH, and the first CORESET or a CORESET associated with the first PDCCH is associated with group information; or corresponds to a type of CORESET, and the type of group information or CORESET is configured in a radio resource control (RRC) configuration for a CG PUSCH; or a CG PUSCH is initiated by a second CORESET or a second PDCCH, and the second CORESET or a CORESET associated with the second PDCCH is associated with group information or corresponds to a type of CORESET.

[0030] A method, wherein a CSI-RS or a group of CSI-RS is indicated by command signaling to share one or more beam states that are the same as a beam state of a first PDCCH or a first PDSCH.

[0031] A method, wherein an SRS or group of SRSs is indicated by command signaling to share one or more beam states that are the same as a beam state of a first PUCCH or a first PUSCH.

[0032] A method, wherein when a physical cell index (PCI) is associated with a beam state, a physical downlink control channel (PDCCH) or a control resource set (CORESET), a physical random access channel (PRACH) configuration is associated with group information or a type of CORESET.

[0033] 11. The method, wherein when a downlink RS is identified from a first RS set associated with a PRACH configuration, a PRACH corresponding to the downlink RS is transmitted according to a mapping between at least one RS in the first RS set and a PRACH transmission opportunity.

[0034] A method, wherein a channel quality corresponding to a second RS set associated with the PRACH configuration is worse than a threshold.

[0035] The method includes determining, by the wireless communication device, a beam state of an uplink signal associated with group information or a type of CORESET according to a most recently occurring physical random access channel (PRACH) transmission.

[0036] The method provides or enables a beam state indicating a unified transmission configuration indicator (TCI) status of a serving cell.

[0037] In another implementation, a method performed by a wireless communication node includes transmitting, by the wireless communication node, a response for link recovery to a wireless communication device, and causing the wireless communication device to determine, according to a downlink reference signal, a beam state of a downlink signal, a defined number of time units after receiving the response for link recovery.

[0038] These and other aspects and their implementations are described in more detail in the drawings, specification, and claims. [Brief description of the drawings]

[0039] Various exemplary implementations of the present solution are described in detail below with reference to the following figures or drawings. The drawings are provided for illustrative purposes only and merely show exemplary implementations of the present solution to facilitate the reader's understanding of the present solution. Thus, the drawings should not be considered as limiting the breadth, scope, or applicability of the present solution. Please note that for clarity and ease of illustration, the drawings are not necessarily drawn to scale.

[0040] [Figure 1] FIG. 1 illustrates an example cellular communication network in which the techniques and other aspects disclosed herein may be implemented in accordance with implementations of the present disclosure.

[0041] [Diagram 2] FIG. 2 illustrates a block diagram of an example base station and user equipment device in accordance with some implementations of the disclosure.

[0042] [Diagram 3] FIG. 3 illustrates an example of contention-free based link recovery in PCell, PSCell, SCell, and / or TRP-specific BFR according to some implementations of the present disclosure.

[0043] [Figure 4] FIG. 4 illustrates an example method for determining a beam state for a DL signal according to some implementations of the present disclosure.

[0044] [Diagram 5] FIG. 5 illustrates another example method for determining a beam state for a DL signal according to some implementations of the present disclosure.

[0045] [Figure 6] FIG. 6 illustrates an example implementation of a UE updating beam state / information and power control for DL ​​and / or UL signals after receiving a BS response in accordance with some implementations of the present disclosure.

[0046] [Figure 7] FIG. 7 illustrates an example TRP-specific link recovery procedure according to some implementations of the present disclosure.

[0047] [Figure 8] FIG. 8 illustrates a framework for association between a type of group information or CORESET and a set of RSs and a group of DL / UL signals according to some implementations of the present disclosure.

[0048] [Figure 9] FIG. 9 illustrates a framework for PRACH association for a set of candidate RSs in a PRACH-based inter-cell link recovery procedure according to some implementations of the present disclosure. DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS

[0049] In order to enable those skilled in the art to make and use the present solution, various exemplary implementations of the present solution are described below with reference to the accompanying drawings. As will be apparent to those skilled in the art, after reading this disclosure, various modifications or changes to the examples described herein can be made without departing from the scope of the present solution. Thus, the present solution is not limited to the exemplary implementations and applications described and illustrated herein. Furthermore, the specific order or hierarchy of steps in the methods disclosed herein is merely an example approach. Based on design preferences, the specific order or hierarchy of steps of the disclosed methods or processes can be rearranged while remaining within the scope of the present solution. Thus, those skilled in the art will understand that the methods and techniques disclosed herein present various steps or operations in a sample order, and that the present solution is not limited to the specific order or hierarchy presented, unless otherwise specified.

[0050] FIG. 1 illustrates an exemplary wireless communication network and / or system 100 in which the techniques disclosed herein according to implementations of the present disclosure may be implemented. In the following description, the wireless communication network 100 may be any wireless network, such as a cellular network or a narrowband Internet of Things (NB-IoT) network, and is referred to herein as "network 100." Such an exemplary network 100 includes a base station (BS) 102 and a user equipment device (UE) 104 that can communicate with each other via a communication link 110 (e.g., a wireless communication channel), and clusters of cells 126, 130, 132, 134, 136, 138, and 140 that overlap a geographic region 101. In FIG. 1, the BS 102 and the UE 104 are contained within the respective geographic boundaries of the cell 126. Each of the other cells 130, 132, 134, 136, 138, and 140 may include at least one base station operating in its assigned bandwidth to provide adequate wireless coverage to an intended user.

[0051] For example, the BS 102 may operate in an assigned channel transmission bandwidth to provide adequate coverage to the UE 104. The BS 102 and the UE 104 may communicate via a downlink (DL) radio frame 118 and an uplink (UL) radio frame 124, respectively. Each radio frame 118 / 124 may be further divided into subframes 120 / 127 that may include data symbols 122 / 128. In this disclosure, the BS 102 and the UE 104 are generally described herein as non-limiting examples of "communication nodes" capable of implementing the methods disclosed herein. Such communication nodes may be capable of wireless and / or wired communication in accordance with various implementations of the present solution.

[0052] 2 illustrates a block diagram of an exemplary wireless communication system 200 for transmitting and receiving wireless communication signals, e.g., OFDM / OFDMA signals, in accordance with some implementations of the present solution. System 200 may include components and elements configured to support known or conventional operational features that need not be described in detail herein. In one exemplary implementation, system 200 may be used to communicate (e.g., transmit and receive) data symbols in a wireless communication environment, such as wireless communication environment 100 of FIG. 1, as described above.

[0053] The system 200 generally includes a BS 202 and a UE 204. The BS 202 includes a BS transceiver module 210, a BS antenna 212, a BS processor module 214, a BS memory module 216, and a network communication module 218, each of which is coupled and interconnected with each other as needed via a data communication bus 220. The UE 204 includes a UE transceiver module 230, a UE antenna 232, a UE memory module 234, and a UE processor module 236, each of which is coupled and interconnected with each other as needed via a data communication bus 240. The BS 202 communicates with the UE 204 via a communication channel 250, which can be any wireless channel or other medium suitable for the transmission of data as described herein.

[0054] As will be appreciated by those skilled in the art, system 200 may further include any number of modules other than those shown in FIG. 2. Those skilled in the art will appreciate that the various example blocks, modules, circuits, and processing logic described in connection with the implementations disclosed herein may be implemented in hardware, computer readable software, firmware, or any practical combination thereof. To clearly illustrate this interchangeability and compatibility of hardware, firmware, and software, the various example components, blocks, modules, circuits, and steps are described generally in terms of their functionality. Whether such functionality is implemented as hardware, firmware, or software may depend on the particular application and design constraints imposed on the overall system. Those familiar with the concepts described herein may implement such functionality in a manner suitable for each particular application, but such implementation decisions should not be interpreted as limiting the scope of the present disclosure.

[0055] According to some implementations, the UE transceiver 230 may be referred to herein as an "uplink" transceiver 230 including a radio frequency (RF) transmitter and an RF receiver, each with circuitry coupled to an antenna 232. Alternatively, a duplexing switch (not shown) may couple the uplink transmitter or receiver to the uplink antenna in a time-duplexing manner. Similarly, according to some implementations, the BS transceiver 210 may be referred to herein as a "downlink" transceiver 210 including an RF transmitter and an RF receiver, each with circuitry coupled to an antenna 212. Alternatively, a downlink duplexing switch may couple the downlink transmitter or receiver to the downlink antenna 212 in a time-duplexing manner. The operation of the two transceiver modules 210 and 230 may be coordinated in time such that the downlink transmitter is coupled to the downlink antenna 212 at the same time that the uplink receiving circuitry is coupled to the uplink antenna 232 for receiving transmissions over the wireless transmission link 250. In some implementations, there is truncated time synchronization with a minimum guard time between changes in duplex direction.

[0056] The UE transceiver 230 and the base station transceiver 210 are configured to communicate over a wireless data communication link 250 and cooperate with a suitably configured RF antenna arrangement 212 / 232 capable of supporting a particular wireless communication protocol and modulation scheme. In some example implementations, the UE transceiver 210 and the base station transceiver 210 are configured to support industry standards, such as Long Term Evolution (LTE), the emerging 5G standard, and the like. However, it will be appreciated that the present disclosure is not necessarily limited to application to a particular standard and associated protocol. Rather, the UE transceiver 230 and the base station transceiver 210 may be configured to support alternative or additional wireless data communication protocols, including future standards or variants thereof.

[0057] According to various implementations, the BS 202 may be, for example, an evolved Node B (eNB), a serving eNB, a target eNB, a femto station, or a pico station. In some implementations, the UE 204 may be embodied in various types of user devices, such as a mobile phone, a smartphone, a personal digital assistant (PDA), a tablet, a laptop computer, a wearable computing device, etc. The processor modules 214 and 236 may be implemented or realized using a general purpose processor, a content addressable memory, a digital signal processor, an application specific integrated circuit, a field programmable gate array, any suitable programmable logic device, discrete gate or transistor logic, discrete hardware components, or any combination thereof designed to perform the functions described herein. Thus, the processor may be realized as a microprocessor, a controller, a microcontroller, a state machine, etc. The processor may also be implemented as a combination of computing devices, such as a combination of a digital signal processor and a microprocessor, multiple microprocessors, one or more microprocessors in combination with a digital signal processor core, or any other such configuration.

[0058] Furthermore, the steps of the method or algorithm described in connection with the implementations disclosed herein may be embodied directly in hardware, firmware, software modules executed by the processor modules 214 and 236, respectively, or any practical combination thereof. The memory modules 216 and 234 may be realized as RAM memory, flash memory, ROM memory, EPROM memory, EEPROM memory, registers, hard disk, removable disk, CD-ROM, or any other form of storage medium known in the art. In this regard, the memory modules 216 and 234 may be coupled to the processor modules 210 and 230, respectively, such that the processor modules 210 and 230 can read information from and write information to the memory modules 216 and 234, respectively. The memory modules 216 and 234 may also be integrated into their respective processor modules 210 and 230. In some implementations, each of the memory modules 216 and 234 may include a cache memory for storing temporary variables or other intermediate information during execution of instructions executed by the processor modules 210 and 230, respectively. Each of the memory modules 216 and 234 may also include non-volatile memory for storing instructions executed by the processor modules 210 and 230, respectively.

[0059] The network communications module 218 generally represents hardware, software, firmware, processing logic, and / or other components of the base station 202 that enable bidirectional communication between the base station transceiver 210 and other network components and communication nodes configured to communicate with the base station 202. For example, the network communications module 218 may be configured to support Internet or WiMAX traffic. In a typical arrangement, but not limited to, the network communications module 218 provides an 802.3 Ethernet interface so that the base station transceiver 210 can communicate with a conventional Ethernet-based computer network. In this manner, the network communications module 218 may include a physical interface for connecting to a computer network (e.g., a Mobile Switching Center (MSC)). The terms "configured for," "configured to," and conjugations thereof, as used herein with respect to a specified operation or function, refer to a device, component, circuit, structure, machine, signal, etc. that is physically configured, programmed, formatted, and / or arranged to perform the specified operation or function.

[0060] High frequency communication protocols (e.g., ultra-wideband or wideband) suffer from propagation losses. To combat such losses, antenna arrays using massive multiple-input multiple-output (MIMO) (e.g., 1024 antenna elements configured for one antenna) and beamforming training techniques are employed to achieve beam alignment to increase antenna gain. Variable phase shift-based beamforming training targets the identification of the best pattern for subsequent data transmission given a pre-specified beam pattern. To support such antenna arrays and maintain low implementation costs, analog phase shifters may be used to implement mm-wave beamforming. Using analog phase shifters results in a finite number of controlled phase and modulus constraints placed on the antenna elements.

[0061] Analog beamforming enhances robustness for high frequency communication but is subject to channel variations. To improve such channel robustness, link recovery procedures (also called beam recovery procedures or beam failure recovery (BFR)) may be adopted in 5G NR. In some embodiments, BFR allows a UE to initiate event-driven reporting of beam failure events and identify new beams for subsequent data transmission. Link recovery procedures may be applied to primary cell (PCell), primary secondary cell (PSCell), secondary cell (SCell), and / or multi-transmit / receive point (TRP) operation (regardless of whether the cell is a PCell or a SCell).

[0062] FIG. 3 illustrates an example of contention-free based link recovery in PCell, PSCell, SCell, and / or TRP-specific BFR according to some implementations of the present disclosure. In operation 302, the UE may detect beam failure. The UE may detect beam failure using a block error rate (BLER) determined by measuring one or more DL reference signals (RS). If the BLER of all (or a portion) of the DL RSs meets a threshold within a configured window, the UE may indicate link failure using a medium access control (MAC) control element (CE). In these embodiments, the UE determines link failure on the MAC layer. In other embodiments, the UE may receive an indication indicating link failure from a physical (PHY) layer. The UE may increment a counter (e.g., BFI_COUNTER) by a defined amount (e.g., 1) for each indication of beam failure. If the UE determines that the BFI_COUNTER meets a threshold, the UE may determine that a beam failure event has occurred.

[0063] In operation 304, the UE may identify a new candidate beam. One or more DL RSs may be / include the candidate RS. The UE may identify a candidate beam (or a candidate DL RS) by measuring a layer 1 (L1) reference signal received power (RSRP). If the L1-RSRP associated with the DL RS meets a threshold, the DL RS may be identified as a new candidate beam. If the channel quality of multiple DL RSs meets a threshold, any DL RS may be selected as a candidate beam (e.g., randomly).

[0064] In operation 306, the UE may initiate a physical random access channel (PRACH)-based link recovery request (e.g., beam failure recovery request BFRQ, link failure recovery request). If a beam failure event is declared and / or at least one new candidate beam is found, the UE initiates the link recovery request. The UE transmits the BFRQ to the BS. For PCell (or PSCell) link recovery, the UE may initiate one or more PRACH transmissions associated with the selected RS beam candidate (e.g., beam candidate from step 304). For SCell link recovery and TRP-specific link recovery (e.g., for multi-TRP operation), the UE may transmit a MAC-CE for the BFR carrying the failed carrier component (CC) index. The UE may also transmit a new candidate beam (e.g., from step 304) for each failed CC via the UL shared channel (UL-SCH) and / or PUSCH. If UL-SCH and / or PUSCH are not available and / or cannot accommodate MAC-CE for BFR, the UE may transmit a dedicated service requirement (SR) (also referred to as PUCCH-BFR or link recovery request in PUCCH) via PUCCH. In operation 308, the BS may respond to the BFRQ request. The UE may receive the BS response (e.g., link recovery response) and then determine the beam state of the downlink signal. In some embodiments, after the UE receives the BS response, one or more previously generated CSI reports are discarded. Additionally or alternatively, the same type of control resource set (CORESET) may correspond to the same CORESET pool identifier (ID) or may not be configured with a CORESET pool ID.

[0065] For link recovery procedures in the unified transmission configuration indicator (TCI) framework, the UE may update beam states / information and power control for various channels and RSs in DL and UL after receiving a BS response. In the unified TCI framework, the physical downlink control channel (PDCCH), physical downlink shared channel (PDSCH), channel state information reference signal (CSI-RS), physical uplink control channel (PUCCH), physical uplink shared channel (PUSCH), and sounding reference signal (SRS) can be associated with the same TCI state / beam (including quasi-co-location (QCL) state, TCI state, spatial relationship, RS, spatial filter, and / or precoding). Thus, updating the TCI state / beam (e.g., QCL state, TCI state, spatial relationship, RS, spatial filter, and / or precoding) simultaneously improves the link recovery procedures in the unified TCI framework.

[0066] For clarity of specification, the spatial filter (or spatial domain filter) may be a UE spatial filter and / or a BS spatial filter. Furthermore, the spatial relationship (or spatial relationship information including beams, spatial parameters, and / or spatial domain filters) includes one or more reference RSs that represent the same or QCL spatial relationship between the target RS (or channel) and one or more reference RSs. The QCL state may include one or more reference RSs and corresponding QCL type parameters (e.g., Doppler spread, Doppler shift, delay spread, average delay, average gain, and spatial Rx parameters). The QCL state may include QCL hypotheses such as QCL-TypeA indicating Doppler shift, Doppler spread, average delay, delay spread parameters, QCL-TypeB indicating Doppler shift and Doppler spread parameters, QCL-TypeC indicating Doppler shift and average delay parameters, and QCL-TypeD indicating spatial Rx parameters.

[0067] It should be understood that, as described herein, a beam state may be interchanged with a beam, a QCL state, a transmission configuration indicator (TCI) state, a spatial relationship (which may also be referred to as spatial relationship information), an RS, a spatial filter, and / or a precoding. Additionally, unless otherwise indicated, a PCell may be interchangeable with a primary cell (e.g., a PSCell) in a corresponding cell group. Additionally, a link recovery may be interchangeable with a beam recovery, and a PRACH may be interchangeable with a random access preamble. As described herein, a time unit may be interchangeable with a subsymbol, a symbol, a slot, a frame, or a transmission opportunity. Similarly, as described herein, an open-loop parameter includes at least one of a target power (e.g., p0) and a coefficient (e.g., alpha). It should be understood that if a DL or UL signal is not configured with group information or is not associated with a type of control resource set (CORESET), the DL or UL signal may be associated with a value of group information equal to zero or a first type of group information, respectively.

[0068] The UE may receive the TCI state according to the downlink control information (DCI). The TCI state may include the QCL relationship between DL RSs. Thus, as used herein, the TCI state may be interchangeable with the QCL state. Similarly, the definition of the transmit / transmit (Tx) beam may be interchangeable with the QCL state, the TCI state, the spatial relationship state, the DL RS, the UL signal, the Tx spatial filter, and / or the Tx precoding. The definition of the receive / receive (Rx) beam may be interchangeable with the QCL state, the TCI state, the spatial relationship state, the spatial filter, the Rx spatial filter, and / or the Rx precoding. The definition of the beam ID may be interchangeable with the QCL state index, the TCI state index, the spatial relationship state index, the RS index, the spatial filter index, and / or the precoding index. The physical downlink control channel (PDCCH) is a physical channel that carries the DCI information. Thus, as described herein, the DCI and the PDCCH may be interchangeable.

[0069] RS may include channel state information reference signals (CSI-RS), synchronization signal blocks (SSBs) (or synchronization signals (SS) / physical broadcast channel (PBCH)), demodulation reference signals (DMRS), sounding reference signals (SRS), and PRACH. As used herein, RS may also include DL RS and / or UL signals. By way of example, DL RS includes CSI-RS, SSB, DMRS (e.g., DL DMRS). UL signals include SRS, DMRS (e.g., UL DMRS), and PRACH. In general, UL signals may include PUCCH, PUSCH, and / or SRS transmissions. Similarly, DL signals may include PDCCH, PDSCH, and / or CSI-RS transmissions.

[0070] Updating the QCL / TCI state / beam simultaneously means considering various forms of latency (e.g., latency associated with the UE decoding the BS response and beam update, and latency after receiving the BS response (for PCEll, PSCell, SCell, and mTRP)). Furthermore, the timeline of the beam update may be based on the beam application time of the TCI (state) update within the unified TCI and / or the timeline of the BFR.

[0071] FIG. 4 illustrates an example method for determining a beam state of a DL signal according to some implementations of the present disclosure. In operation 402, the UE may receive a response for link recovery from the BS. For PCell (or PSCell) link recovery, the UE may receive the BS response by monitoring the PDCCH in a dedicated CORESET and / or a dedicated search space for link recovery (or beam recovery) according to a QCL parameter associated with the candidate DL RS. The CORESET is a resource set used to convey control information. The QCL parameters may include at least one of a Doppler spread, a Doppler shift, a delay spread, an average delay, an average gain, or a spatial parameter (which may also be considered as a spatial Rx parameter). For SCell link recovery (or TRP-specific link recovery for multi-TRP operation), the UE may receive the BS response by receiving DCI / PDCCH signaling scheduling a PUSCH transmission with the same hybrid automatic repeat request (HARQ) process number (and a toggled new data indicator (NDI) field) as the transmission of the PUSCH carrying the MAC-CE for the BFR. When the UE detects the BS response, the UE may update the QCL assumptions for one or more CORESETs and can update the spatial filter (or spatial domain filter) for the PUCCH resources. The response for link recovery includes at least one of PDCCH signaling in a dedicated CORESET and / or dedicated search space for link recovery (or beam recovery), DCI / PDCCH signaling with a toggled new data indicator (NDI) field, and / or scheduling a PUSCH transmission with the same HARQ process (e.g., the same HARQ process number) as the PUSCH carrying the MAC-CE for BFR.

[0072] In operation 404, the UE may determine the beam state of the DL signal at / after a defined number of time units after receiving a response for link recovery according to the candidate DL RS. After the defined number of time units after receiving the BS response, the UE may determine the beam state of the DL signal (e.g., including CORESET, PDSCH, and PDCCH in CSI-RS) according to the candidate DL RS (e.g., the candidate beam in step 304 of FIG. 3) indicated by the random access preamble signaling (e.g., PRACH signaling) and / or MAC-CE signaling. The beam state of the DL signal may include a spatial filter. Additionally or alternatively, the UE determines the beam state of the DL signal according to the candidate DL RS from a set (e.g., a new set) of candidate RSs associated with the DL signal (e.g., a new candidate RS set).

[0073] The UE may determine the beam state of the UL signal (e.g., including PUCCH, PUSCH, and SRS) according to the candidate DL RS candidates or also the previous (or latest) PRACH transmission, and the beam state of the UL signal includes a spatial filter. Additionally or alternatively, the UE may determine the beam state of the UL signal according to the candidate DL RS from a new candidate RS set (e.g., candidate RS) associated with the UL signal. For a PCell / PSCell, the beam state of the UL signal may be determined according to the previous (latest) PRACH transmission and may include a spatial filter. For example, the UL signal may be transmitted using the same spatial domain filter as the previous PRACH transmission. For a SCell or cell with two or more beam failure detection RS sets (e.g., for beam failure detection) and / or one or more candidate RS sets (for new beam candidate beam identification), the beam state of the UL signal may be determined according to the candidate DL RS and may include a spatial filter.

[0074] The UE may update the power for the UL signal after receiving the BS response (e.g., after a defined number of time units after receiving the BS response to the BFRQ in step 308 of FIG. 3). For example, the UE may determine a power control parameter for the UL signal (e.g., a UL power control parameter, or alternatively, a power control parameter). The power control parameter may include at least one of a path loss RS, an open loop parameter, or a closed loop index. For clarity of specification, the closed loop index may be interchangeable with the power control adjustment state.

[0075] The path loss RS of the UL signal may be determined according to the candidate DL RS (e.g., the candidate beam of step 304). Additionally or alternatively, the path loss RS of the UL signal may be determined according to a new candidate DL RS (e.g., a new set of RSs or candidate RSs) from the RS set associated with the UL signal. In an example, the UL signal may be associated with a group information or type of CORESET (e.g., may correspond to a TRP), and the new candidate RS set may be associated with the respective group information or type of CORESET. If both the UL signal and the new candidate RS set are associated with the same group information or the same / single CORESET type, the UE may determine that the new candidate RS set is associated with the UL signal. The group information (e.g., specific to a TRP) may include information grouping one or more reference signals, a resource set, a beam state set, a panel, a subarray, an antenna group, an antenna port group, a group of antenna ports, a beam group, a physical cell index (PCI), a TRP index, a CORESET pool ID, and / or a UE capability set. The resource set may include an RS set of resources for beam failure detection, and the UE capability set may include the capabilities of the UE (e.g., the number of antenna ports (e.g., SRS antenna ports) and / or the number of layers (e.g., for PUSCH or PDSCH)).

[0076] The open-loop parameters of the UL signal may be determined according to the open-loop parameters having a specific index. The specific index may be zero, a minimum (first value), and / or a maximum (last value). The open-loop parameters may include a target power (e.g., p0) and / or a coefficient (e.g., alpha). The UE may determine the open-loop parameters of the UL signal according to the open-loop parameters (having a specific index) from a group associated with the UL signal. For example, given multiple groups, each associated with group information and / or a type of CORESET, the UL signal may be associated with the group information and / or the type of CORESET. That is, the UE may determine the specific index associated with the open-loop parameters according to the group information of the UL signal and / or the type of CORESET of the UL signal. When the UL signal is associated with group information having an index of Y (and Y is an integer), or a type of the Yth CORESET, the UE may determine the open-loop parameters according to the open-loop parameters having a specific index. The specific index may be Y or Y-1. Additionally or alternatively, the UE may determine the open-loop parameters according to the open-loop parameters having the Yth smallest index, the Yth index, the Yth largest index, and / or the Yth last index (e.g., Yth index count backwards from the last index). In an example, there may be two types of UL signals. Each UL signal may be associated with a CORESET Pool ID. Thus, the open-loop parameters of the UL signal associated with a first CORESET Pool ID (e.g., CORESET Pool ID=0) are determined according to the open-loop parameters of index=0. The open-loop parameters of the UL signal associated with a second CORESET Pool ID (e.g., CORESET Pool ID=1) are determined according to the open-loop parameters of index=1.

[0077] The UE may determine the closed-loop index of the UL signal according to a specific value. The specific value may be zero, minimum (first value), and / or maximum (last value). The UE may also determine the closed-loop index of the UL signal according to the type of group information associated with the UL signal and / or the CORESET associated with the UL signal. If the UL signal is associated with the Yth group information or the Yth CORESET, the specific value may refer to minimum Y, 1-Yth, and / or Y-1 when Y is an integer. In an example, there may be two types of UL signals. Each UL signal may be associated with a CORESET Pool ID. Thus, the closed-loop index of the UL signal associated with the first CORESET Pool ID (e.g., CORESET Pool ID=0) is 0. The closed-loop index of the UL signal associated with the second CORESET Pool ID (e.g., CORESET Pool ID=1) is 1.

[0078] The UE may also determine the closed-loop index of the UL signal by setting a value of the closed-loop associated with the closed-loop index to 0 (e.g., reset the value of the closed-loop index). In an example, there may be two closed loops associated with the UE, each having a unique index. The closed-loop associated with the closed-loop index of the UL signal may be reset. Additionally or alternatively, the closed-loop associated with the closed-loop index of the UL signal may be reset to zero. The UE may also use a transmission power control (TPC) command in the DCI signaling associated with the DL signal to determine the value of the closed-loop associated with the closed-loop index. Additionally or alternatively, the UE may determine the value of the closed-loop index associated with the closed loop according to a ramp-up value of a PRACH transmission (e.g., the last PRACH transmission before a BS response) and / or a TPC command in a DCI carrying a BS response (e.g., a response for link recovery). For example, if the UL signal is the first UL signal after a defined number of symbols from the last symbol of the first PDCCH reception, the UE determines the value of the closed-loop index corresponding to the UL signal. The UE may determine the value according to the ramp-up value of the previous PRACH transmission and the TPC command in a DCI format with cyclic redundancy check (CRC) scrambling with a Radio Network Temporary Identifier (RNTI) (e.g., C-RNTI and / or MCS-C-RNTI) that the UE detected in the first PDCCH reception in the search space set provided by recoverySearchSpaceId.

[0079] 5 illustrates another exemplary method for determining a beam state of a DL signal according to some implementations of the present disclosure. At 502, the BS may transmit a response for link recovery to the UE. In some embodiments, the BS may transmit the response for link recovery in response to receiving a BFRQ indicating that the UE has identified a beam failure event and that the UE has identified a candidate beam. The response for link recovery may cause the UE to determine a beam state of the DL signal according to the candidate DL RS at / after a defined number of time units after receiving the response for link recovery.

[0080] 6 illustrates an example implementation of a UE updating both beam control and power control for both DL and UL signals after receiving a BS response (e.g., BS response to BFRQ in step 308) according to some implementations of the present disclosure. As shown, the BS may transmit a response 606 to the BFRQ at time 602. After receiving a BS response for the BFRQ at time 602 (e.g., link recovery or MAC-CE for PRACH) a defined number of symbols (e.g., at time 604), the UE updates the beam state 608 and power control 610 simultaneously.

[0081] The UE may determine the beam state of the DL signal according to the candidate DL RS starting from the first slot after a defined number of time units after receiving the BS response. The first slot may be determined according to the component carrier (CC) or bandwidth portion (BWP) carrying the BS response, and / or one or more CCs or BWPs with link failure. The UE may also determine the beam state of the UL signal according to the last occurring PRACH transmission and / or the candidate DL RS. The UE may determine the beam state of the UK signal starting from the first time slot after a defined number of time units after receiving the BS response. As mentioned above, the first time slot may be determined according to the CC or BWP carrying the BS response, and / or one or more CCs or BWPs with link failure.

[0082] The updated beam states (e.g., QCL hypotheses determined according to candidate DL RSs from the new candidate RS set) may correspond to candidate DL RSs to be applied to DL signals including PDCCH, PDSCH, and / or CSI-RS. The updated beam states (e.g., spatial filters determined according to candidate DL RSs or previous PRACH transmissions) may also correspond to candidate DL RSs to be applied to UL signals including PUCCH, PUSCH, and / or SRS. As shown, updated beam states 608 corresponding to candidate DL RSs and / or previous PRACH transmissions (e.g., PRACH transmissions prior to the BS response 606 at time 602) are applied to both DL signals (including PDCCH, PDSCH, and / or CSI-RS) and UL signals (PUCCH, PUSCH, and / or SRS).

[0083] As shown, in addition to updating the beam state 608, the UE may update the power control 610 (e.g., the path loss RS, the open loop parameters, and / or the closed loop index), which applies to UL signals including the PUCCH, the PUSCH, and / or the SRS.

[0084] Although FIG. 6 illustrates a defined number of symbols between time 602 and time 604, it should be understood that the time between time 602 and time 604 can be any time unit including subsymbols, slots, subframes, frames, or transmission opportunities. In some embodiments, the defined number of time units is 28. In other embodiments, the defined number of time units is a radio resource control (RRC) configured for DCI-based beam state update. Additionally or alternatively, the defined number of time units is an RRC configured in a CC or bandwidth portion (BWP) carrying a response for link recovery (e.g., a BS response to a BFRQ in operation 308). For example, a beam application time may be configured per BWP per CC. Thus, the defined time is determined according to a configured beam application time in an active BWP carrying a BS response. In other embodiments, each of the time units may include an orthogonal frequency division multiplexing (OFDM) symbol or a time slot.

[0085] The timeline (e.g., number of time units) of the beam update may be based on a subcarrier spacing (SCS). The UE may determine an SCS according to a minimum value of one or more SCSs for one or more CCs or BWPs (e.g., active DL BWPs) with beam failure (or link failure) and a CC or BWP carrying a BS response (e.g., a response for link recovery). The UE may also determine an SCS corresponding to a minimum value of one or more SCSs for one or more CCs or BWPs with link failure (e.g., active DL BWPs). The UE may also determine an SCS corresponding to a minimum value of one or more SCSs for one or more CCs or BWPs in a CC list. The UE may determine a CC list according to an RRC parameter. The RRC parameter may be used to indicate a CC list for simultaneous beam state updates on multiple CCs. In an example, the UE may determine a minimum value of SCSs for active BWPs in a CC with beam failure. In another example, the UE may determine a minimum value of SCSs for active BWPs or CCs in a CC list.

[0086] The timeline of the beam update (e.g., the number of time units until the beam state is updated / applied) may also be based on the CC or BWP with the minimum value of one or more SCS for one or more CCs or BWPs with link failure and the CC or BWP carrying a response for link recovery (e.g., BS response). The timeline of the beam update may also be based on the CC or BWP with the minimum value of one or more SCS for one or more CCs or BWPs with link failure. Furthermore, the number of time units may be determined by the UE based on the CC or BWP with the minimum value of one or more SCS for one or more CCs or BWPs in the CC list. The UE may determine the CC list according to the RRC parameter. The RRC parameter may be used to indicate the CC list for simultaneous beam state update on multiple CCs.

[0087] Improving the link recovery procedure in the unified TCI framework may also include simultaneously updating the QCL / TCI state / beam in the case of carrier aggregation (CA) and component carrier (CC). In a carrier aggregation (CA) scenario, DL and UL signals are placed in a CC in the list or a BWP in the BWP list. The UE may update the QCL / TCI state / beam for DL ​​and UL channels across CCs (e.g., across two CCs) by determining a QCL-TypeA or QCL-TypeC assumption in a target CC in the CC list based on a new candidate DL RS beam in the reference CC. The reference CC may be a CC where a DL RS corresponding to a candidate DL RS is placed.

[0088] The UE may determine the CC list as including one or more CCs for which one or more beam states for one or more DL signals and one or more UL signals are simultaneously indicated by a single signal. For example, the beam states for different DL or UL signals may be simultaneously updated / indicated using a single command such as MAC-CE or DCI signaling. The UE may also determine the CC list according to the RRC parameters used to indicate the CC list as including one or more CCs for which one or more beam states are simultaneously applied to one or more DL or UL signals. For example, the RRC parameters may correspond to the same CC list as the simultaneous TCI update list (e.g., simultaneous TCI-UpdateList1 or simultaneous TCI-UpdateList2) for PDSCH and / or PDCCH to save RRC parameter overhead. The UE may also determine the UL signal of the CC list according to the RRC parameters used to indicate the CC list with simultaneous spatial relationship or spatial filter update.

[0089] The UE may determine the beam state of the DL signal in the first CC or first BWP according to the second DL RS associated with the candidate DL RS. In some embodiments, the second DL RS and the DL signal are in the first CC or first BWP. In some embodiments, the second DL RS is associated with the candidate DL RS via an RRC configuration and / or a MAC-CE command. In some embodiments, the second DL RS and the candidate DL RS have the same RS index. In some embodiments, the second DL RS is determined according to the RS index of the candidate DL RS and / or an offset configured via RRC or MAC-CE signaling. For example, if the offset is configured to be 10 and the RS index of the candidate DL RS is 20, the second DL RS may be 30 (e.g., offset + candidate DL RS). In some embodiments, the second DL RS may correspond to a QCL type assumption such as QCL-TypeA.

[0090] The UE may also improve the link recovery procedure in the unified TCI framework by updating the QCL / TCI state / beam simultaneously in both single-TRP (sTRP) and multi-TRP operations. The UE may divide the DL channel, UL channel, and RS into two or more groups via explicit signaling. Each group (and its group information) may correspond to a TRP. Thus, the UE may update the beam (state / information) and power control according to each TRP.

[0091] For multi-TRP operation (e.g., determining associations between DL / UL signals and candidate DL RSs), the DL / UL signals and candidate RS sets may be associated with group information (e.g., the same group information for each TRP) or a type of CORESET (e.g., corresponding / specific to the same TRP).

[0092] FIG. 7 illustrates an example TRP-specific link recovery procedure according to some implementations of the present disclosure. Operation 702 may be similar to operation 302 of FIG. 3 in structure and functionality. In operation 702, the UE detects a beam failure in an RS set (e.g., RS set 712). Operation 704 may be similar to operation 304 of FIG. 3 in structure and functionality. In operation 704, the UE identifies a candidate RS set (e.g., RS set 714) for a new beam identification. Operation 706 may be similar to operation 306 in structure and functionality. In operation 706, the UE transmits a link recovery request to the BS (e.g., BFRQ) via PUCCH signaling and MAC-CE. The link recovery request may include the SR and candidate beams 716. Operation 708 may be similar to operation 308 of FIG. 3 in structure and functionality. In operation 708, the UE receives the BS response and may perform a behavior / action / procedure. As shown, the UE updates DL and UL signals 718. Each of the RS sets 712, RS sets 714, SR+ candidates 716, and DL / UL signals 718 may be associated with a certain type of CORESET 720 via the RRC parameters CORESETPoolID and / or group information. Based on the framework, a candidate beam (or candidate DL RS) may be applied to DL and UL signals 718 associated with the same group information and / or the same type of CORESET (e.g., to determine PL-RS and beam state).

[0093] As described herein, the same type of CORESET may correspond to the same CORESET pool ID (and / or the same TRP). Furthermore, the group information may include information grouping one or more reference signals, a resource set, a beam state set, a panel, a subarray, an antenna group, an antenna port group, a group of antenna ports, a beam group, a physical cell index (PCI), a TRP index, a CORSET pool ID, and / or a UE capability set. The resource set may include resources of a beam failure detection RS set, and the UE capability set includes a UE capability (e.g., the number of antenna ports (e.g., SRS antenna ports) and / or the number of layers (e.g., for PUSCH or PDSCH)). The group information may represent a UE panel and one or more features associated with the UE panel. Furthermore, the group information may represent (or correspond to) a TRP and one or more features associated with the TRP.

[0094] Referring to FIG. 8, a framework for association between one type of group information / CORESET and RS sets and groups of DL / UL signals according to some implementations of the present disclosure is shown. RS set 812 may correspond to RS set 712 of FIG. 7, and RS set 814 may correspond to RS set 714 of FIG. 7. As shown, one type of group information or CORESET may be associated with a TCI state and / or a TCI state group. Each TCI state may be associated with an individual type of group information or an individual CORESET. Additionally or alternatively, to save / minimize / reduce RRC overhead, one TCI state group may be associated with an individual type of group information or an individual CORESET. Additionally or alternatively, one type of group information or CORESET may be associated with a CORESET and / or a PDCCH 802. A CORESET may be composed of group information or a CORESET pool ID that may be used to indicate (or correspond to) a TRP in a multi-TRP environment.

[0095] Additionally or alternatively, the group information or a type of CORESET can be associated with a first type of PDSCH 804 (e.g., a PDSCH scheduled by a DCI such as DCI format 1_0 / 1 / 2). In these embodiments, if a CORESET is associated with one type of CORESET (e.g., CORESET Pool ID=0, or not configured with a CORESET Pool ID), the PDSCH scheduled by a DCI in the CORESET can be associated with the same type of CORESET (e.g., CORESET Pool ID=0). The first type of PDSCH can be scheduled by a first CORESET or a first PDCCH, and the CORESET associated with the first CORESET or the first PDCCH is associated with the group information or corresponds (or matches) to a type of CORESET. The group information or a type of CORESET can be associated with a configured grant (CG) PDSCH 804. In these embodiments, the group information or type of CORESET can be configured in the RRC configuration for the CG PDSCH (e.g., for Type-I CG PDSCH in NR). The CG PDSCH may be initiated by the first CORESET and / or the first PDCCH. The CORESET associated with the first CORESET or the first PDCCH that initiated the CG PDSCH may be associated with the group information and may correspond to the type of CORESET (e.g., for Type-II CG PDSCH in NR). In an example, if a CORESET is associated with group information (e.g., CORESET pool ID or PCI), the PDSCH initiated by a PDCCH in the CORESET may be associated with the same group information.

[0096] Additionally or alternatively, a type of group information or CORESET may be associated with a PUCCH resource and / or a PUCCH resource group 806. The association between a type of group information or CORESET may be per PUCCH resource group. Thus, each PUCCH resource in a group may be associated with a type of group information and / or a CORESET.

[0097] Additionally or alternatively, the group information or type of CORESET can be associated with a first type of PUSCH 808 (e.g., a PUSCH scheduled by a DCI such as DCI format 1_0 / 1 / 2). In these embodiments, if a CORESET is associated with one type of CORESET (e.g., CORESET pool ID=1), a PDSCH scheduled by a DCI in the CORESET can be associated with the same type of CORESET (e.g., CORESET pool ID=1). The first type of PUSCH can be scheduled by a first CORESET or a first PDCCH. Here, the CORESET associated with the first CORESET or the first PDCCH is associated with the group information or corresponds to the type of CORESET. The group information or type of CORESET (sometimes referred to interchangeably as "type of CORESET" or type of CORESET") can be associated with a CG PUSCH 808. In these embodiments, the group information or type of CORESET can be configured in the RRC configuration for the CG PUSCH (e.g., for Type-I CG PUSCH in NR). The CG PUSCH may be initiated by the first CORESET and / or the first PDCCH. The CORESET associated with the first CORESET or the first PDCCH that initiated the CG PUSCH may be associated with the group information or may correspond to the type of CORESET (e.g., for Type-II CG PUSCH in NR). In an example, if the CORESET is associated with group information (e.g., CORESET pool ID or PCI), the CG PUSCH initiated by the PDCCH in the CORESET may be associated with the same group information.

[0098] Additionally or alternatively, some type of group information or CORESET may be associated with CSI-RS resources and / or groups of CSI-RS resources 810. The CSI-RS resources and / or CSI-RS resource groups may be indicated by command signaling (e.g., using a flag) to share one or more beam states that are the same as beam states of the PDCCH and / or PDSCH signaling.

[0099] Additionally or alternatively, some type of group information or CORESET can be associated with SRS resources and / or groups of SRS resources 816. The SRS resources and / or SRS resource groups can be indicated by command signaling (e.g., using a flag) to share the same one or more beam states as the beam states of the PUCCH and / or PUSCH signaling.

[0100] The UE may also improve link recovery procedures in the unified TCI framework by simultaneously updating the QCL / TCI state / beam in one serving cell served by at least two PCells (e.g., inter-cell link recovery procedure). The UE may be configured with two TCI states for inter-cell beam management / mobility. Each TCI state may correspond to a specific group information or type of CORESET. For PCell (or PSCell) link recovery procedures, the UE may use cell-specific PRACH-based transmissions in inter-cell multi-TRP operation. If the PCI is associated with beam state, PDCCH, and / or CORESET, the PRACH configuration (based on the last PRACH transmission) may be associated with the group information or type of CORESET.

[0101] 9 illustrates a framework for PRACH association for candidate RS sets in a PRACH-based inter-cell link recovery procedure according to some implementations of the present disclosure. Each group (e.g., first group 902 and second group 904) in FIG. 9 may correspond to one cell (e.g., a serving cell and / or a non-serving cell (e.g., a TRP with a different PCI than the serving cell). As illustrated, when a beam failure event corresponding to RS set 912 (corresponding to RS set 712 in FIG. 7) is identified in a cell and further a new candidate RS is identified from RS set 914 (corresponding to RS set 714 in FIG. 7), the candidate DL is selected as the candidate DL. The PRACH corresponding to the RS is transmitted according to a mapping 920 between at least one RS in the new candidate RS set and the PRACH transmission opportunity. If the channel quality meets a threshold (e.g., threshold channel quality), the channel quality may correspond to the RS set (e.g., RS set 914) associated with the PRACH configuration. In an example, the RS set (e.g., RS set 914) may correspond to a beam failure detection RS set. Thus, the channel quality corresponding to the beam failure is worse (or inferior) than the threshold. Since BLER may be an exemplary metric in detecting beam failure, the BLER associated with the channel quality is worse (or inferior) than the metric.

[0102] The UE may determine the beam state (e.g., spatial filter) for the UL signal according to the PRACH transmission (e.g., corresponding to the same group information / PCI) associated with the UL signal. That is, the beam state of the UL signal associated with the type of group information or CORESET may be determined according to the last occurring PRACH transmission. In these embodiments, a beam state indicating a unified TCI state of the serving cell (e.g., PCell / PSCell) may be provided and / or enabled.

[0103] Although various implementations of the present solution have been described above, it should be understood that they are presented only as examples and not as limitations. Similarly, various figures may depict example architectures or configurations provided to enable those skilled in the art to appreciate example features and functionality of the present solution. However, such a person will appreciate that the solution is not limited to the depicted example architectures or configurations, but can be implemented using various alternative architectures and configurations. Furthermore, as will be appreciated by those skilled in the art, one or more features of one implementation can be combined with one or more features of another implementation described herein. Thus, the breadth and scope of the present disclosure should not be limited by any of the exemplary implementations described above.

[0104] It is also understood that any reference to an element herein using a designation such as "first," "second," etc., does not generally limit the quantity or order of those elements. Rather, these designations may be used herein as a convenient means of distinguishing between two or more elements or instances of an element. Thus, a reference to a first and a second element does not imply that only two elements may be used or that the first element must precede the second element in any way.

[0105] Furthermore, those skilled in the art will understand that information and signals may be represented using any of a variety of different technologies and techniques. For example, the data, instructions, commands, information, signals, bits and symbols that may be referred to in the above description may be represented by voltages, currents, electromagnetic waves, magnetic fields or particles, optical fields or particles, or any combination thereof.

[0106] Those skilled in the art will further appreciate that any of the various example logic blocks, modules, processors, means, circuits, methods, and functions described in connection with the aspects disclosed herein can be implemented by electronic hardware (e.g., digital implementations, analog implementations, or a combination of the two), firmware, various forms of programs or design code incorporating instructions (for convenience, referred to herein as "software" or "software modules"), or any combination of these technologies. To clearly illustrate this interchangeability of hardware, firmware, and software, various example components, blocks, modules, circuits, and steps have been described above generally in terms of their functionality. Whether such functionality is implemented as hardware, firmware, or software, or a combination of these technologies, depends on the particular application and design constraints imposed on the overall system. Those skilled in the art may implement the described functionality in various ways for each particular application, but such implementation decisions are not intended to depart from the scope of the present disclosure.

[0107] Further, those skilled in the art will appreciate that the various example logic blocks, modules, devices, components, and circuits described herein can be implemented in or executed by an integrated circuit (IC), which may include a general purpose processor, a digital signal processor (DSP), an application specific integrated circuit (ASIC), a field programmable gate array (FPGA) or other programmable logic device, or any combination thereof. The logic blocks, modules, and circuits may further include an antenna and / or a transceiver for communicating with various components in a network or device. The general purpose processor may be a microprocessor, although in alternative examples, the processor may be any conventional processor, controller, or state machine. The processor may also be implemented as a combination of computing devices, such as a combination of a DSP and a microprocessor, multiple microprocessors, one or more microprocessors in combination with a DSP core, or any other suitable configuration for performing the functions described herein.

[0108] When implemented in software, the functions can be stored as one or more instructions or codes on a computer-readable medium. Thus, the steps of a method or algorithm disclosed herein can be implemented as software stored in a computer-readable medium. Computer-readable media includes both computer storage media and communication media, including any medium that can enable a computer program or code to be transferred from one place to another. A storage medium can be any available medium that can be accessed by a computer. By way of example, and not limitation, such computer-readable media can include RAM, ROM, EEPROM, CD-ROM or other optical disk storage, magnetic disk storage or other magnetic storage devices, or any other medium that can be used to store desired program code in the form of instructions or data structures and that can be accessed by a computer.

[0109] The term "module" as used herein refers to software, firmware, hardware, and any combination of these elements for performing the associated functions described herein. Moreover, for purposes of explanation, various modules are described as individual modules. However, as would be apparent to one skilled in the art, two or more modules may be combined to form a single module that performs associated functions according to implementations of the present solution.

[0110] Further, memory or other storage devices and communication components may be used in the implementation of the solution. It will be appreciated that for clarity, the above description has described the implementation of the solution with reference to different functional units and processors. However, it will be apparent that any suitable distribution of functionality between different functional units, processing logic elements or domains may be used without detracting from the solution. For example, functions shown to be performed by separate processing logic elements or controllers may be performed by the same processing logic element or controller. Thus, references to specific functional units do not indicate a strict logical or physical structure or organization, but merely to suitable means for providing the described functionality.

[0111] Various modifications to the implementations described in this disclosure will be readily apparent to those skilled in the art, and the general principles defined herein can be applied to other implementations without departing from the scope of the present disclosure. Thus, the present disclosure is not intended to be limited to the implementations shown herein, but is to be accorded the widest scope consistent with the novel features and principles disclosed herein, as set forth in the following claims.

Claims

1. 1. A method, comprising: receiving, by the wireless communication device, a response for link recovery from the wireless communication node; determining, by the wireless communication device according to a downlink reference signal (RS), a beam state of a downlink signal, a defined number of time units after receiving a response for the link recovery; A method comprising:

2. The downlink RS is indicated by a random access preamble signaling or a medium access control and control element (MAC-CE) signaling; or the downlink RS is from a set of candidate RSs associated with the downlink signal; The method of claim 1 , further comprising at least one of:

3. The method of claim 1 , comprising determining, by the wireless communication device, a beam state of an uplink signal according to a last occurring physical random access channel (PRACH) transmission or the downlink RS.

4. At least one of the beam states of the uplink signal or the beam states of the downlink signal comprises a spatial filter. For a primary cell (PCell), the beam state of the uplink signal is determined according to the last-occurred PRACH transmission. For a secondary cell (SCell) or a cell having at least one of two or more RS sets or two or more candidate RS sets for beam failure detection, the beam state of the uplink signal is determined according to the downlink RS; or the beam state of the uplink signal is determined according to the downlink RS from a set of candidate RSs associated with the uplink signal; The method of claim 3, wherein at least one of

5. 10. The method of claim 1, wherein the downlink signal comprises at least one of a physical downlink control channel (PDCCH), a physical downlink shared channel (PDSCH), or a channel state information reference signal (CSI-RS).

6. 4. The method of claim 3, wherein the uplink signal comprises at least one of a physical uplink control channel (PUCCH), a physical uplink shared channel (PUSCH), or a sounding reference signal (SRS).

7. 4. The method of claim 3, comprising determining, by the wireless communication device, a power control parameter of the uplink signal, the power control parameter comprising at least one of a path loss RS, an open loop parameter, or a closed loop index.

8. The method of claim 7, comprising determining, by the wireless communication device, the path loss RS according to the downlink RS or the downlink RS from a set of candidate RSs associated with the downlink signal.

9. determining, by the wireless communication device, the open-loop parameters according to an open-loop parameter having a particular index; The particular index is zero, a minimum or first value, or a maximum or last value. The open loop parameters comprise at least one of a target power or a coefficient. The open-loop parameter having the particular index is from a group associated with the uplink signal; or The specific index is determined according to the type of group information or control resource set (CORESET) of the uplink signal; The method of claim 7, further comprising at least one of:

10. If the uplink signal is associated with group information having an index of Y or a Y-th type of control resource set (CORESET), the method includes: determining, by the wireless communication device, the open-loop parameters according to an open-loop parameter having a specific index, the specific index being Y or Y-1; or determining, by the wireless communication device, the open-loop parameters according to an open-loop parameter having a Y-th lowest index, a Y-th index, a Y-th highest index, or a Y-th last index; The method of claim 7 , further comprising at least one of:

11. determining, by the wireless communication device, the closed-loop index according to a particular value; The particular value is zero, a minimum or first value, or a maximum or last value. The closed-loop index of a UL signal is determined according to group information associated with the uplink signal or a type of a control resource set (CORESET) of the uplink signal. The closed-loop value associated with the closed-loop index is reset; or the value of the closed loop associated with the closed loop index is determined according to at least one of a ramp-up value of a Physical Random Access Channel (PRACH) transmission, a transmit power control (TPC) command in a downlink control information (DCI) signaling carrying a response for the link recovery, or a TPC command in a DCI signaling associated with the uplink signal. The method of claim 7, further comprising at least one of:

12. 4. The method of claim 3, wherein at least one of the downlink signal or the uplink signal is placed in a component carrier (CC) in a CC list or a bandwidth part (BWP) in a BWP list.

13. determining, by the wireless communication device, the CC list; The CC list is determined as including one or more CCs for which one or more beam states are simultaneously indicated by a single signaling for one or more downlink or uplink signals, or The CC list is determined as including one or more CCs for which one or more beam states are simultaneously applied to one or more downlink or uplink signals according to a Radio Resource Control (RRC) parameter for indicating the CC list; or The method of claim 12 , wherein the CC list is determined according to an RRC parameter for indicating CC lists with simultaneous spatial relationships or spatial filter updates for the uplink signal.

14. determining, by the wireless communication device, the beam state of the downlink signal in a first component carrier (CC) or a first bandwidth portion (BWP) according to a second downlink RS associated with the downlink RS; The second downlink RS and the downlink signal are in the first CC or a first BWP. the second downlink RS is associated with the downlink RS via a Radio Resource Control (RRC) configuration or a Medium Access Control-Control Element (MAC-CE) command; the second downlink RS and the downlink RS have the same RS index; The second downlink RS is determined according to at least one of an RS index of the downlink RS or an offset configured via RRC or Media Access Control and Control Element (MAC-CE) signaling; or the second downlink RS corresponds to a quasi-co-location (QCL) type assumption; The method of claim 1 , further comprising at least one of:

15. 2. The method of claim 1 , wherein the number of defined time units is at least one of 28, determined according to a radio resource control (RRC) configured for beam state updates, or an RRC configuration associated with a component carrier (CC) or bandwidth portion (BWP) carrying the response for the link recovery.

16. The subcarrier spacing (SCS) corresponding to the number of time units defined above is: one or more component carriers (CCs) or bandwidth portions (BWPs) with link failures, and one or more SCS minimums for the CCs or BWPs carrying a response for said link recovery; A minimum of one or more SCSs for one or more CCs or BWPs with link failures, or A minimum value of one or more SCSs for one or more CCs or BWPs in a CC list determined according to a radio resource control (RRC) parameter for indicating a CC list with simultaneous updating of beam status. The method of claim 1 , wherein the at least one of the following is determined:

17. The number of time units defined above is: a component carrier (CC) or bandwidth portion (BWP) having a minimum of one or more SCSs for one or more CCs or BWPs with link failure and a response for said link recovery; A CC or BWP with one or more SCS minimums for one or more CCs or BWPs with link failures, or A CC or BWP having a minimum value of one or more SCSs for one or more CCs or BWPs in a CC list determined according to a radio resource control (RRC) parameter for indicating a CC list with simultaneous updating of beam status. The method of claim 1 , wherein the at least one of the following is determined:

18. determining, by the wireless communication device according to the downlink RS, the beam state of the downlink signal starting from a first slot after the defined number of time units after receiving a response for the link recovery; The first slot comprises: A component carrier (CC) or bandwidth portion (BWP) carrying the response for the link recovery; or One or more CCs or BWPs with link failures The method of claim 1 , wherein the at least one of the following is determined:

19. determining, by the wireless communication device, the beam state of the uplink signal according to the downlink RS starting from a first slot after a last occurring physical random access channel (PRACH) transmission or the defined number of time units after receiving a response for the link recovery; The first slot comprises: A component carrier (CC) or bandwidth portion (BWP) carrying the response for the link recovery; or One or more CCs or BWPs with link failures The method of claim 3 , wherein the at least one of the following is determined:

20. one or more previously generated channel state information (CSI) reports are withdrawn after receiving the response for the link recovery; or A set of controlled resources (CORESET) of the same type corresponds to the same CORESET pool identifier (ID) or is not configured with a CORESET pool ID. The method of claim 1 , further comprising at least one of:

21. The method of claim 2 or 3, wherein the downlink or uplink signal and the set of candidate RSs associated with the downlink or uplink signal are associated with a type of group information or control resource set (CORESET).

22. The group information comprises at least one of information grouping one or more RSs, a resource set, a beam state set, a panel, a subarray, an antenna group, an antenna port group, a group of antenna ports, a beam group, a physical cell index (PCI), a transmit / receive point (TRP) index, a CORESET pool identifier (ID), or a set of capabilities of the wireless communication device; The resource set comprises an RS set for beam failure detection; or The set of capabilities comprises a plurality of antenna ports or a plurality of layers.

22. The method of claim 21 , wherein at least one of

23. The type of the group information or the CORESET is: a transmission configuration indicator (TCI) state or group of TCI states; CORESET or Physical Downlink Control Channel (PDCCH); a first type of physical downlink shared channel (PDSCH); Configured Grant (CG) PDSCH, a physical uplink control channel (PUCCH) resource or a group of PUCCH resources; A first type of physical uplink shared channel (PUSCH); C.G. P.S.H. A channel state information RS (CSI-RS) or a group of CSI-RS, or Sounding RS (SRS) resource or group of SRS The method of claim 21 , wherein the method is associated with at least one of:

24. 24. The method of claim 23, wherein the CORESET is comprised of group information or a CORESET pool identifier (ID).

25. The first type of the PDSCH is scheduled by a first CORESET or a first PDCCH, and the first CORESET or a CORESET associated with the first PDCCH is associated with the group information or corresponds to a type of the CORESET; The group information or the type of the CORESET is configured in a radio resource control (RRC) configuration for a CG PDSCH; or The CG PDSCH is initiated by a second CORESET or a second PDCCH, and the second CORESET or a CORESET associated with the second PDCCH is associated with the group information or corresponds to a type of the CORESET; 24. The method of claim 23, wherein at least one of

26. The first type of the PUSCH is scheduled by a first CORESET or a first PDCCH, and the first CORESET or a CORESET associated with the first PDCCH is associated with the group information or corresponds to a type of the CORESET; The group information or the type of the CORESET is configured in a radio resource control (RRC) configuration for CG PUSCH; or The CG PUSCH is initiated by a second CORESET or a second PDCCH, and the second CORESET or a CORESET associated with the second PDCCH is associated with the group information or corresponds to a type of the CORESET; 24. The method of claim 23, wherein at least one of

27. The method of claim 23, wherein the CSI-RS or the group of CSI-RS is indicated by command signaling to share one or more beam states that are the same as a beam state of a first PDCCH or a first PDSCH.

28. 24. The method of claim 23, wherein the SRS or the group of SRSs is indicated by command signaling to share one or more beam states that are the same as a beam state of a first PUCCH or a first PUSCH.

29. 2. The method of claim 1, wherein if a physical cell index (PCI) is associated with the beam state, a physical downlink control channel (PDCCH), or a control resource set (CORESET), a physical random access channel (PRACH) configuration is associated with group information or a type of the CORESET.

30. 30. The method of claim 29, wherein once the downlink RS is identified from a first RS set associated with the PRACH configuration, a PRACH corresponding to the downlink RS is transmitted according to a mapping between at least one RS in the first RS set and a PRACH transmission opportunity.

31. 31. The method of claim 30, wherein a channel quality corresponding to a second RS set associated with the PRACH configuration is worse than a threshold.

32. 30. The method of claim 29, comprising determining a beam state of an uplink signal associated with the group information or the type of CORESET according to a last occurring Physical Random Access Channel (PRACH) transmission by the wireless communication device.

33. 30. The method of claim 29, wherein a beam state indicative of a unified transmission configuration indicator (TCI) status for a serving cell is provided or enabled.

34. 1. A method, comprising: transmitting, by the wireless communication node, a response for link recovery to the wireless communication device; determining a beam state of a downlink signal according to a downlink reference signal (RS), the wireless communication device a defined number of time units after receiving a response for the link recovery; A method comprising:

35. 35. A non-transitory computer readable medium storing instructions that, when executed by at least one processor, cause the at least one processor to perform the method of any one of claims 1 to 34.

36. 35. Apparatus comprising at least one processor configured to carry out the method of any one of claims 1 to 34.

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