Methods, apparatuses and computer programs

Abstract

There is provided a method, apparatus and computer program for causing an apparatus to perform: receiving first information from a network access node, the first information indicating that the apparatus is to set a first transmission configuration indicator, TCI, state as an active TCI state of the apparatus; receiving second information from the network access node, the second information indicating that the network access node will not transmit at least one reference signal for synchronization for an indicated duration; transmitting a request to the network access node for transmission of the at least one reference signal for synchronization; and receiving the at least one reference signal for synchronization from the network access node based on the request.

Description

Technical Field

[0001] This application relates to an apparatus, method, and computer program for signaling associated with setting the Transmission Configuration Indicator (TCI) state to an active TCI state. Background Technology

[0002] A communication system can be viewed as a facility that enables a communication session between two or more entities (such as user terminals, base stations, and / or other nodes) by providing carrier waves between various entities involved in the communication path. For example, a communication system can be provided by means of a communication network and one or more compatible communication devices. The communication session can include, for example, data communications used to carry the communication, such as voice, video, email, text messaging, multimedia, and / or content data. Non-limiting examples of the services provided include two-way or multi-way calling, data communication, or multimedia services, and access to data network systems such as the Internet.

[0003] Communication systems and associated equipment typically operate according to a given standard or specification that defines what the various entities associated with the system are allowed to do and how they should be implemented. The communication protocols and / or parameters used for connectivity are also usually defined. An example of a communication system is UTRAN (Universal Mobile Telecommunications Services Terrestrial Radio Access Network, e.g., 3G Radio). Other examples are the Long Term Evolution (LTE) of Universal Mobile Telecommunications System (UMTS) radio access technology, and so-called 5G or New Radio (NR) networks. NR is being standardized by the 3rd Generation Partnership Project (3GPP). Summary of the Invention

[0004] According to a first aspect, an apparatus is provided, comprising: at least one processor; and at least one memory including code, which, when executed by the at least one processor, causes the apparatus to: receive first information from a network access node, the first information indicating that the apparatus intends to set a first Transmission Configuration Indicator (TCI) state to an active TCI state; receive second information from the network access node, the second information indicating that the network access node will not transmit at least one reference signal for synchronization for an indicated duration; send a request to the network access node for transmission of the at least one reference signal for synchronization; and receive the at least one reference signal for synchronization from the network access node based on the request.

[0005] According to a second aspect, an apparatus is provided, the apparatus comprising components for performing the following: receiving first information from a network access node, the first information indicating that the apparatus intends to set a first Transmission Configuration Indicator (TCI) state to an active TCI state; receiving second information from the network access node, the second information indicating that the network access node will not transmit at least one reference signal for synchronization for an indicated duration; sending a request to the network access node for transmission of at least one reference signal for synchronization; and receiving at least one reference signal for synchronization from the network access node based on the request.

[0006] According to a third aspect, a method for a device is provided, the method comprising: receiving first information from a network access node, the first information indicating that the device intends to set a first Transmission Configuration Indicator (TCI) state to an active TCI state of the device; receiving second information from the network access node, the second information indicating that the network access node will not transmit at least one reference signal for synchronization for an indicated duration; sending a request to the network access node for transmission of at least one reference signal for synchronization; and receiving at least one reference signal for synchronization from the network access node based on the request.

[0007] According to a fourth aspect, an apparatus is provided, comprising: a receiving circuit system for receiving first information from a network access node, the first information indicating that the apparatus intends to set a first Transmission Configuration Indicator (TCI) state to an active TCI state; a receiving circuit system for receiving second information from the network access node, the second information indicating that the network access node will not transmit at least one reference signal for synchronization for an indicated duration; a transmitting circuit system for transmitting a request to the network access node for transmission of at least one reference signal for synchronization; and a receiving circuit system for receiving at least one reference signal for synchronization from the network access node based on the request.

[0008] The following items may apply to any one of the first to fourth aspects (e.g., one or more aspects, including all aspects).

[0009] The first and second messages can be received via the same signaling process.

[0010] The first and second information can be received through different signaling processes.

[0011] At least one of the first or second information can be received via the media access control control element.

[0012] At least one of the first or second information can be received via downlink control information.

[0013] The device can also be configured to perform time-frequency synchronization based on at least one reference signal to perform at least one of the following: activating a first TCI state or switching from a second TCI state to a first TCI state.

[0014] The device can also be made to: provide the device's capability information to a network access node, wherein the capability information indicates whether the device is able to request the transmission of a synchronization signal block and / or whether the device is able to perform time-frequency synchronization based on at least one reference signal.

[0015] According to a fifth aspect, an apparatus is provided, comprising: at least one processor; and at least one memory including code, which, when executed by the at least one processor, causes the apparatus to: send first information to a user equipment, the first information indicating that the user equipment intends to set a first Transmission Configuration Indicator (TCI) state to an active TCI state of the user equipment; send second information to the user equipment, the second information indicating that the apparatus will not transmit at least one reference signal for synchronization for an indicated duration; receive a request from the user equipment for transmission of at least one reference signal for synchronization; and based on the request, transmit at least one reference signal for synchronization to the user equipment.

[0016] According to a sixth aspect, an apparatus is provided, the apparatus comprising components for performing the following: sending first information to a user equipment, the first information indicating that the user equipment intends to set a first Transmission Configuration Indicator (TCI) state to an active TCI state of the user equipment; sending second information to the user equipment, the second information indicating that the apparatus will not transmit at least one reference signal for synchronization for an indicated duration; receiving a request from the user equipment for transmission of at least one reference signal for synchronization; and transmitting at least one reference signal for synchronization to the user equipment based on the request.

[0017] According to a seventh aspect, a method of apparatus is provided, the method comprising: sending first information to a user equipment, the first information indicating that the user equipment intends to set a first Transmission Configuration Indicator (TCI) state to an active TCI state of the user equipment; sending second information to the user equipment, the second information indicating that the apparatus will not transmit at least one reference signal for synchronization for an indicated duration; receiving a request from the user equipment for transmission of at least one reference signal for synchronization; and transmitting at least one reference signal for synchronization to the user equipment based on the request.

[0018] According to an eighth aspect, an apparatus is provided, comprising: a transmitting circuit system for transmitting first information to a user equipment, the first information indicating that the user equipment intends to set a first transmission configuration indicator (TCI) state to an active TCI state of the user equipment; a transmitting circuit system for transmitting second information to the user equipment, the second information indicating that the apparatus will not transmit at least one reference signal for synchronization for an indicated duration; a receiving circuit system for receiving a request from the user equipment for transmission of at least one reference signal for synchronization; and a transmitting circuit system for transmitting at least one reference signal for synchronization to the user equipment based on the request.

[0019] The following items may apply to any one of the above aspects from fifth to eighth (e.g., one or more aspects, including all aspects).

[0020] The device can also be made to determine that the device is not configured to send a reference signal during a predetermined duration during which the first information is sent, wherein sending the second information is performed based on the determination.

[0021] The first and second messages can be sent via the same signaling process.

[0022] The first and second information can be sent via different signaling processes.

[0023] At least one of the first or second information can be sent via the media access control control element.

[0024] At least one of the first or second information can be sent via downlink control information.

[0025] The device can also be made to perform: receiving capability information of the user equipment from the user equipment, wherein the capability information indicates whether the user equipment is able to request the transmission of a reference signal.

[0026] The following items may apply to any one of the first to eighth aspects (e.g., one or more aspects, including all aspects).

[0027] The second information includes at least one of the following: an indication of the time when the network access node will send at least one reference signal; an indication of the time when the network access node will send at least one reference signal before it; an instruction to avoid signaling the network access node to request the transmission of the reference signal; or an indication that the network access node has been triggered to send the reference signal and / or whether the device is capable of performing time-frequency synchronization based on at least one reference signal.

[0028] According to one aspect, a non-transitory computer-readable medium is provided comprising program instructions that, when executed by a device, cause the device to perform at least the method according to any one of the preceding aspects.

[0029] Many different embodiments have been described above. It should be understood that other embodiments may be provided by combination of any two or more of the embodiments described above. Attached Figure Description

[0030] Embodiments will now be described by way of example only with reference to the accompanying drawings, in which:

[0031] Figure 1 Representations of a network system according to some example embodiments are shown;

[0032] Figure 2 A representation of a control device according to some example embodiments is shown;

[0033] Figure 3 A representation of an apparatus according to some example embodiments is shown;

[0034] Figures 4 to 6 The illustration shows an example timing when the TCI status activation command is sent;

[0035] Figures 7 to 10 The diagram illustrates the implementation example signaling; and

[0036] Figures 11 to 17 Example methods that can be performed by the apparatus described herein are illustrated. Detailed Implementation

[0037] In general, this application relates to an apparatus, method, and computer program for signaling associated with setting the Transmission Configuration Indicator (TCI) state to an active TCI state. This signaling can be used to initially activate the TCI state and / or to perform a change to the currently active TCI state. For clarity and brevity, the TCI state signaling may be referred to as TCI state activation signaling. However, it should be understood that any one of these TCI operations is encompassed by this expression.

[0038] More specifically, several methods for improving the efficiency of the TCI state activation signaling process are described below, which can reduce the time required for TCI state activation. Reducing the time required for TCI state activation is directly related to reducing the time required to allocate resources to the UE after such activation, which translates to reduced service interruptions for the UE.

[0039] In the method described below, a network access node is provided that signals a TCI state change activation signaling to a user equipment (UE) and information indicating whether the network access node intends to (e.g., is scheduled to) transmit a reference signal that can be used for synchronization with a new TCI state for a predetermined duration. The UE can use this information to avoid sending a request for on-demand transmission of the reference signal (e.g., when the reference signal is intended to be transmitted for the predetermined duration), or to trigger the transmission of a request for on-demand transmission of the reference signal earlier (e.g., if the reference signal is not intended to be transmitted for the predetermined duration).

[0040] The following discussion further explores a scenario where, after the network access node (NAT) signals the UE to activate the TCI state, the UE provides the NAT with information indicating whether it has synchronized with one or more reference signals in time and frequency. The NAT can use this information to perform resource allocation, as resources can be allocated to the UE when it is synchronized with the NAT. Similar to the examples above, the NAT can also provide the UE with information indicating whether it intends to send reference signals that can be used for synchronization with the new TCI state within a predetermined duration. However, it should be understood that network devices may avoid sending such information.

[0041] Although these concepts will be discussed in more detail later, Figure 1 An example communication environment 100 in which example embodiments of the present disclosure may be implemented is shown.

[0042] In communication environment 100, multiple communication devices (including user equipment 110 and 115 (also referred to herein as "terminals" or "terminal devices") and network device 120 (also referred to herein as "network access node")) can communicate with each other. Network device 120 can serve a coverage area referred to as cell 125. User equipment 110 can access the communication network via cell 125. In some example embodiments, both user equipment 110 and network device 120 can be configured to implement beamforming technology and communicate with each other via multiple beams.

[0043] The term "terminal device" refers to any terminal device capable of wireless communication. By way of example and not limitation, a terminal device may also be referred to as a communication device, user equipment (UE), subscriber station (SS), portable subscriber station, mobile device, mobile station (MS), or access terminal (AT). Terminal devices may include, but are not limited to, mobile phones, cellular phones, smartphones, VoIP phones, wireless local loop phones, tablets, wearable terminal devices, personal digital assistants (PDAs), portable computers, desktop computers, image capture terminal devices (such as digital cameras), gaming terminal devices, music storage and playback devices, in-vehicle wireless terminal devices, wireless endpoints, mobile stations, laptop embedded devices (LEEs), laptop mounted devices (LMEs), USB adapters, smart devices, wireless customer premises equipment (CPEs), machine-type communication (MTC) devices, Internet of Things (IoT) devices, watches or other wearable devices, head-mounted displays (HMDs), vehicles, drones, medical devices and applications (e.g., remote surgery), industrial devices and applications (e.g., robots and / or other wireless devices operating in industrial and / or automated processing chain environments), consumer electronics devices, devices operating on commercial and / or industrial wireless networks, etc. Terminal devices may also correspond to the mobile terminal (MT) portion of an IAB node (e.g., a relay node). In the following description, the terms "terminal device," "communication device," "terminal," "user equipment," "user equipment," and "UE" are used interchangeably.

[0044] As used herein, the terms "network device" and "network access node" are used interchangeably and refer to a node in a communication network through which terminal devices can access the network and receive services. A network device can refer to a base station (BS) or access point (AP), such as a Node B (NodeB or NB), an evolved Node B (eNodeB or eNB), an NR NB (also known as a gNB), a Remote Radio Unit (RRU), a Radio Header (RH), a Remote Radio Header (RRH), a relay, an Integrated Access and Backhaul (IAB) node, a low-power node (such as a femtosecond or picosecond), a non-terrestrial network (NTN), or a non-terrestrial network device (such as satellite network equipment, low Earth orbit (LEO) satellites and geostationary orbit (GEO) satellites, aircraft network equipment, etc.), depending on the terminology and technology applied. In some example embodiments, the Radio Access Network (RAN) split architecture includes a centralized unit (CU) and a distributed unit (DU) at the IAB donor node. The IAB node consists of: the mobile terminal (IAB-MT) part, which behaves like a UE to the parent node; and the DU part of the IAB node, which behaves like a base station to the next-hop IAB node.

[0045] In some example embodiments, the link from network device 120 to user equipment 110 or 115 is referred to as DL, while the link from user equipment 110 or 115 to network device 120 is referred to as UL. The link is also referred to herein as a “channel.” In DL, network device 120 is a Tx device (or transmitter), and user equipment 110 or 115 is an Rx device (or receiver). In UL, user equipment 110 or 115 is a Tx device (or transmitter), and network device 120 is an Rx device (or receiver). The link between user equipment 110 and another user equipment (not shown) is referred to as a sidelink (SL). In SL, one user equipment is a Tx device (or transmitter), and the other user equipment is an Rx device (or receiver).

[0046] Communication in communication environment 100 can be implemented according to any suitable communication protocol(s), including but not limited to cellular communication protocols such as first-generation (1G), second-generation (2G), third-generation (3G), fourth-generation (4G), fifth-generation (5G), and sixth-generation (6G), wireless local area network communication protocols such as IEEE 802.11, and / or any other currently known or to be developed in the future. Furthermore, communication can utilize any suitable wireless communication technology, including but not limited to: Code Division Multiple Access (CDMA), Frequency Division Multiple Access (FDMA), Time Division Multiple Access (TDMA), Frequency Division Duplex (FDD), Time Division Duplex (TDD), Multiple-Input Multiple-Output (MIMO), Orthogonal Frequency Division Multiplexing (OFDM), Discrete Fourier Transform Spread Spectrum OFDM (DFT-s-OFDM), and / or any other currently known or to be developed in the future.

[0047] 3GPP networks (such as Figure 1 (As shown) The Transmission Configuration Indicator (TCI) state is used to indicate the current transmission configuration for decoding the Physical Downlink Shared Channel (PDSCH). Specifically, the TCI state is an indication of the quasi-co-addressable (QCL) relationship between the downlink reference signal in the CSI reference signal set and the demodulation reference signal (DMRS) port of the Physical Downlink Shared Channel (PDSCH). In other words, the TCI state establishes a QCL relationship between the target reference signal and the source reference signal. The TCI state can be particularly useful for beamforming and multi-beam transmission.

[0048] The network access node can initially activate the TCI state of the UE by sending a command to the UE to activate the TCI state. This will cause the UE to set the signaled TCI state as one of the UE's "active" TCI states.

[0049] A network access node can dynamically change the current TCI state (e.g., the so-called "active TCI state") maintained at the UE by sending signaling to the UE to instruct the UE to change its active TCI state to the target TCI state. The TCI state change will allow the UE to reconfigure its decoding parameters to correctly receive data on a new beam corresponding to the second TCI state.

[0050] The TCI states that will be active at the UE can be indicated to the UE by the network access node using information elements included in the Media Access Control (MAC-CE) element transmitted on the PDSCH. Additionally, the network access node can use downlink control information (DCI) to indicate to the UE that the UE should switch TCI states. The TCI states indicated via DCI are part of the multiple active TCI states maintained at the UE.

[0051] The target TCI state can be "known" or "unknown".

[0052] During the period from the last transmission of the reference signal resource in the Layer 1 Reference Signal Received Power (L1-RSRP) measurement report for the target downlink TCI state to the completion of the active downlink TCI state handover (where the reference signal resource is the reference signal of the target downlink TCI state, or the reference signal QCL of the target downlink TCI state), the target TCI state is considered known: • The downlink TCI state switching command is received within 1280ms after the last transmission of the reference signal resource used for beam reporting or measurement; • Before the UE receives the downlink TCI state switching command, the UE has already sent at least one L1-RSRP report of the target downlink TCI state; • The target downlink TCI state remains detectable during the downlink TCI state transition period; and • During the downlink TCI switching period, the synchronization signal block (SSB) associated with the downlink TCI state remains detectable.

[0053] When these conditions are not met, the downlink TCI state is considered unknown.

[0054] Figure 2 It is shown that a network device 120 (such as Figure 1An example of a control device 200 that performs the operation of the network device. The control device may include: at least one random access memory (RAM) 211a, at least one read-only memory (ROM) 211b, at least one processor 212, 213, and an input / output interface 214. At least one processor 212, 213 may be coupled to RAM 211a and ROM 211b. At least one processor 212, 213 may be configured to execute appropriate software code 215. Software code 215 may, for example, allow the execution of one or more steps to perform one or more aspects of a particular aspect. Software code 215 may be stored in ROM 211b. Control device 200 may be interconnected with another control device 200 that controls another function of the network device. In some embodiments, each function of the network device includes control device 200. In some exemplary embodiments, device 200 may be implemented at network device 120, or may be network device 120 itself.

[0055] Figure 3 An example of terminal 300 is shown, such as Figure 1 User equipment 110 and 115 are shown. Terminal 300 can be provided by any device capable of transmitting and receiving wireless signals, such as the user equipment described herein. Terminal 300 can provide communication, for example, for carrying data for communication. Communication can be one or more of voice, email, text messages, multimedia, data, machine data, etc.

[0056] Terminal 300 can receive signals via air or wireless interface 307 through appropriate means for receiving, and can transmit signals via appropriate means for transmitting wireless signals. Figure 3 In the diagram, the transceiver device is schematically represented by block 306. The transceiver device 306 can be provided, for example, via a wireless component and an associated antenna arrangement. The antenna arrangement can be located inside or outside the mobile device.

[0057] Terminal 300 may be equipped with at least one processor 301, at least one ROM 302a, at least one RAM 302b, and other possible components 303 for software and hardware-assisted execution of the tasks it is designed to perform, including control over access systems (as described above). Figure 1 and Figure 2The network device described provides access to a network access system and other communication devices, and facilitates communication with them. At least one processor 301 is coupled to RAM 302b and ROM 302a. At least one processor 301 can be configured to execute appropriate software code 308. The software code 308 may, for example, allow the execution of one or more aspects. The software code 308 can be stored in ROM 302a.

[0058] Processors, storage devices, and other related control devices can be housed in appropriate circuit boards and / or chipsets. This feature is indicated by reference numeral 304. The device may optionally have a user interface, such as a keypad 305, a touch-sensitive screen or touchpad, or a combination thereof. Depending on the type of device, one or more of a display, speaker, and microphone may optionally be provided.

[0059] In some exemplary embodiments, terminal 300 may be an apparatus including at least one processor and at least one memory storing instructions, which, when executed by the at least one processor, cause user equipment 110, 115 to perform the examples or embodiments described in this document.

[0060] In 5G New Radio (NR), time and frequency synchronization can be acquired based on the UE (e.g., ...). Figure 1 and Figure 3 (As shown) Search and detect from network access nodes (such as Figure 1 and Figure 2 The reference signal (such as the synchronization signal block (SSB) shown).

[0061] The SSB comprises a synchronization signal section and a broadcast section. The synchronization signal section includes the primary synchronization signal (PSS) and the secondary synchronization signal (SSS), which are collectively referred to as synchronization signals in this document. The broadcast section includes the Physical Broadcast Channel (PBCH) and the demodulation reference signal (DMRS) used for PBCH demodulation. The MIB in the PBCH provides information about when SIB1 is scheduled.

[0062] More specifically, performing a partial cell search of the SSB by the UE may include performing at least one of the following features:

[0063] PSS detection: PSS is a predetermined sequence modulated using a predetermined binary phase shift keying (BPSK) scheme. PSS serves as a marker indicating where network access node information can be found within the time-frequency grid. Therefore, the UE can use the detected PSS to help locate network access node information within the time-frequency grid.

[0064] SSS detection: SSS is another predetermined sequence modulated using the BPSK scheme. The time-frequency location of the SSS can be determined based on information collected from the PSS. The UE can also use the detected SSS to assist in locating network access node information in the time-frequency grid.

[0065] DMRS detection for the Physical Broadcast Channel (PBCH): DMRS is a type of signal whose time-frequency location and content are known to both the network access node and the UE once the UE knows the Physical Cell Identity (PCI) of the cell over which the SSB transmits. DMRS allows the UE to determine the impact of the radio channel on signal amplitude and phase in order to predict and recover relevant received signals for unknown content. DMRS detection helps the UE correctly demodulate signals on the Physical Broadcast Channel (PBCH).

[0066] PBCH Demodulation: The PBCH physical channel comprises information / signals located at multiple time-frequency locations. Information broadcast on the PBCH can be demodulated and decoded using an estimate of the radio channel calculated from PBCHDMRS. This information may include a Master Information Block (MIB) and at least one System Information Block (SIB). At least one SIB may be included within the MIB. For example, SIB1 scheduling information may be included within the MIB.

[0067] Although SSBs are currently broadcast periodically, some 3GPP discussions have considered shortening the current cycle of these transmissions and supplementing this reduction by sending additional SSBs on demand (e.g., in response to requests for SSB transmissions). This aims to conserve transmission resources. An on-demand SSB transmission request can be considered a request to send an SSB signal to a network access node.

[0068] In the context of TCI state switching, existing radio resource management requirements in 3GPP define that after a UE receives a MAC-CE associated with a target TCI state (e.g., a TCI state indication for the Physical Downlink Control Channel (PDCCH) or PDSCH, or activation of a TCI state for the PDSCH), the UE must first synchronize with the SSB after a predetermined period of time. Only after synchronization with the SSB is complete is the UE considered capable of using these target TCI states and can be allocated resources for transmission and / or reception by the network access node.

[0069] This is like Figure 4 As shown.

[0070] Figure 4 This is a timeline illustrating actions related to the user interface (UE).

[0071] At time t1, the UE receives the MAC-CE TCI state activation command.

[0072] After a predetermined time period, the UE receives multiple SSBs during time t2.

[0073] At time t3, the UE receives downlink control information on the physical downlink control channel. This downlink control information includes a TCI indication. Subsequently, the UE receives signaling on the PDSCH.

[0074] Figure 5A and Figure 5B The diagram illustrates how the introduction of On-Demand SSB would affect the process. Figure 5A and Figure 5B reuse Figure 4 The tag.

[0075] Figure 5A The illustration depicts a scenario where an on-demand SSB request is received at the network access node at time t0. Figure 5A This causes the SSB to be sent before time t2. The UE is unaware of this scheduled time, leading to uncertainty in the time-frequency synchronization time.

[0076] Figure 5B The illustration depicts a scenario where the network access node is not provided with an on-demand SSB transmission request from another UE at time t0. Instead, the network access node waits until it receives the on-demand SSB transmission request from the UE at time t1', and then sends the requested SSB after the TCI state activation signaling at time t2'. This may cause the UE to perform time-frequency synchronization very late, resulting in a later allocation of resources to the UE after the TCI state activation signaling.

[0077] like Figure 5A and Figure 5B As shown, the use of on-demand SSB transmission may introduce significant uncertainty regarding when the UE is considered to be in time-frequency synchronization with the reference signal after TCI state activation. This could lead to reduced efficiency in the TCI state activation process because the network access node will not allocate resources corresponding to the newly activated TCI state until it knows that the UE is in time-frequency synchronization with the newly activated TCI state reference signal.

[0078] Similar issues to the SSB mentioned above also apply to other reference signals that can be used for synchronization after the UE is in TCI state activation. For example, in the case of uplink TCI state switching delay or active uplink TCI state list delay, after the UE receives the TCI activation command via MAC-CE, the UE synchronizes with the Path Loss Reference Signal (PL-RS) before the TCI state switching delay is considered complete. The PL-RS can be an SSB or a Channel State Information Reference Signal (CSI-RS).

[0079] Therefore, changing the transmission timing of the SSB (e.g., by changing the period of the SSB transmission) may affect the TCI state change method.

[0080] For example, if an SSB is scheduled to be transmitted within that time frame, or if another UE has already requested the transmission of an SSB, the UE can be configured to wait for an SSB signal for a predetermined amount of time after receiving a TCI state change command. If the SSB is not received within that time frame, the UE can send a request for SSB transmission to the network access node, and the network access node can then transmit the SSB based on that request.

[0081] However, such a process may lead to uncertainty in the time required for the TCI state change operation to complete, which may reduce the efficiency of the process.

[0082] The following aims to address at least one of the problems mentioned above.

[0083] Specifically, the following aims to provide the UE with information indicating whether the SSB or another reference signal that can be used for TCI state change time-frequency synchronization will be transmitted within x seconds. The UE can use this information to determine whether to avoid requesting the transmission of the SSB (or any other suitable reference signal) or to signal the request for transmission of the SSB (or any other suitable reference signal) earlier. The “other” reference signal and / or “any other suitable reference signal” can be considered any signal capable of performing time-frequency synchronization. For example, the signal can be any unencrypted signal and / or a signal that the UE is configured to decrypt.

[0084] The following also considers the case where the TCI state change command does not require the UE to perform new time-frequency synchronization, and the method used in this case.

[0085] These scenarios, such as Figures 7 to 17 As shown. In particular, Figures 7 to 10 The illustrations show implementation examples demonstrating various features of one or more methods described in this article, while Figures 11 to 17 Example methods that can be performed by the apparatus described herein are shown. Figures 11 to 17 The illustrations highlight the features and principles shown in the various implementation examples.

[0086] In the implementation example, Figures 7 to 8 The diagram illustrates a method that can be performed when a network access node instructs another network access node to send at least one reference signal within a predetermined time period for time-frequency (e.g., time and frequency) synchronization of the TCI state activated at the UE. Figure 9 The diagram illustrates a method that can be executed when a network access node instructs another network access node not to send at least one reference signal for a predetermined duration. Figure 10The diagram illustrates a method that can be used when the UE does not need to perform time-frequency synchronization after the TCI state activation command is received.

[0087] Figure 7 This involves a scenario where the network access node has already received a request to perform on-demand SSB transmission at time t0 before sending the TCI state activation command to the UE. This is relative to... Figure 6 An explanation was given. Figure 6 and Figure 4 The only difference is the addition of a marker time t0.

[0088] Figure 7 The illustration depicts at least one example method that can be implemented by network access node 701 and / or UE 702. Figure 7 In the example, the network access node notifies the UE whose active TCI state is about to change that the SSB will be sent soon (e.g., within a predetermined duration and / or at a specific time).

[0089] It should be understood that, despite Figure 7 The example refers to an instance where a TCI state change process is being executed, but the same approach can be performed when the process is an initial TCI state activation process.

[0090] During period 7001, network access node 701 transmits a reference signal. The reference signal can be received by UE 702. UE 702 can perform one or more measurements on the reference signal received at UE 702 according to the measurement configuration at UE 702.

[0091] During 7002, UE 702 sends a signaling notification to network access node 701. This signaling may include a report based on measurements performed on a reference signal received at the UE. The report may be sent according to the report configuration. The report may include a Layer 1 (L1) Reference Signal Received Power (RSRP) report. For example, the signaling of 7002 may include one or more values ​​corresponding to at least one RSRP measurement performed on the reference signal.

[0092] During 7003, the network access node determines, based on the report received during 7002, that the active TCI status maintained at the UE should be updated.

[0093] During 7003, network access node 701 can also determine that network access node 701 intends to send an SSB in the next x seconds, where the value x can be configured by the operator (e.g., via operation and management functions), set by 3GPP specifications, or determined in any other way.

[0094] As a result of an SSB transmission request from a UE (e.g., from another UE besides UE 702) and / or as a result of a configuration defining when a network access node is configured to send SSBs, network access node 701 may intend to send an SSB within the next x seconds. In the former case (e.g., where the SSB is intended to be sent by the network node as a result of a request from another UE), the request from the other UE may be received within a time period T during which the network access node determines that the active TCI state list maintained at UE 702 should be updated. The value of T may be set by the specification and / or configured by the operator.

[0095] During period 7004, network access node 701 signals to UE 702. This signaling may include a command to change the active TCI state maintained at UE 702. The signaling may also include information instructing network access node 701 to send an SSB in the near future. In other words, the signaling may also include information instructing network access node 701 to send an SSB within the next x seconds (e.g., within a predetermined duration). It should be understood that the predetermined duration may be indicated by a simple binary indication of the expected transmission time and / or that the SSB will be sent within the maximum duration.

[0096] During period 7005, UE 702 waits to receive at least one SSB sent by the network access node. For example, during period 7005, UE 702 avoids sending an SSB request to the network access node for the network access node to send.

[0097] During 7006, UE 702 receives at least one SSB transmission from network access node 701. UE 702 performs time-frequency synchronization with network access node 701 based on the received at least one SSB transmission.

[0098] During 7007, the UE activates the TCI state indicated by the command in 7004.

[0099] This could involve sending information to the network access node instructing the UE to be in time-frequency synchronization with a reference signal corresponding to another TCI state. This could take the form of a Hybrid Automatic Repeat Request (HARQ), a measurement report, or something similar.

[0100] Although not shown, after the UE activates the TCI state indicated in the TCI state activation command, the network access node can allocate resources based on the active TCI state maintained at the UE. Resource allocation can be instructed to the UE via a DCI command, whereby the UE is instructed to switch to the active TCI state.

[0101] Figure 7The network access node can utilize MAC-CE to perform TCI state switching or TCI state activation to provide the UE with the time for the next on-demand SSB transmission. This is useful when the network access node has received an on-demand SSB transmission request from (multiple) other UEs or has determined that it will send an "aperiodic" SSB (without a request from any UE), and expects to perform the SSB transmission when it coincides with the time when the UE has received the TCI state switching or TCI state activation and expects to perform time-frequency synchronization.

[0102] Figure 8 Another example is illustrated, which can be performed by at least one network access node 801 and / or UE 802. In this example, the network access node indicates to the UE at least one reference signal that can be used by the UE for time-frequency synchronization, instead of an SSB.

[0103] It should be understood that, despite Figure 8 The example refers to an instance where a TCI state change process is being executed, but the same approach can be performed when the process is changed to an initial TCI state activation process.

[0104] During step 8001, network access node 801 transmits a reference signal. This reference signal can be received by UE 802. UE 802 can perform one or more measurements on the reference signal received at UE 802 according to its measurement configuration.

[0105] During 8002, UE 802 sends a signaling notification to network access node 801. This signaling may include a report based on measurements performed on a reference signal received at the UE. The report may be sent according to the report configuration. The report may include a Layer 1 (L1) Reference Signal Received Power (RSRP) report. For example, the signaling of 8002 may include one or more values ​​corresponding to at least one RSRP measurement performed on the reference signal.

[0106] During 8003, the network access node determines, based on the report received during 8002, that the active TCI state maintained at the UE should be updated. In other words, during 8003, it is determined that at least one of the active TCI states maintained at the UE should be changed to another TCI state.

[0107] During 8003, network access node 801 can also determine that network access node 801 does not intend to send an SSB in the next x seconds, but will instead send another reference signal in the next x seconds, where the value of x can be configured by the operator (e.g., via operation and management functions), set by 3GPP specifications, or determined in any other way.

[0108] During period 8004, network access node 801 sends a signaling notification to UE 802. This signaling may include a command to change the active TCI state maintained at UE 802. The signaling may also include information instructing network access node 801 to send another reference signal in the near future. In other words, the signaling may also include information instructing network access node 801 to send another reference signal within the next x seconds.

[0109] During 8005, UE 802 waits to receive another reference signal sent by the network access node.

[0110] During period 8006, UE 802 receives another reference signal from network access node 801. UE 802 performs time-frequency synchronization with network access node 801 based on the received other reference signal.

[0111] During 8007, the UE activates the TCI state indicated by the command in 8004. This may involve sending information to the network access node instructing the UE to be in time-frequency synchronization with a reference signal corresponding to another TCI state. This can take the form of Hybrid Automatic Repeat Request (HARQ), measurement reports, etc.

[0112] Although not shown, after the UE activates the TCI state indicated in the TCI state activation command, the network access node can allocate resources based on the active TCI state maintained at the UE. Resource allocation can be instructed to the UE via a DCI command, whereby the UE is instructed to switch to the active TCI state.

[0113] exist Figure 8 In the example, the network access node may have recently sent an SSB (e.g., just before the TCI state switching command was sent). In this case, after the network access node sends a MAC-CE to the UE with a TCI state switching or TCI state activation command, the network access node can send a temporary reference signal (e.g., a path loss reference signal). The MAC-CE for TCI state switching or TCI state activation may include details of the temporary reference signal. Furthermore, the downlink control information (DCI) scheduling the PDSCH carrying the aforementioned TCI state activation command can schedule and / or trigger the transmission of this temporary reference signal and instruct the UE to use the reference signal for time / frequency synchronization for the TCI state to be activated.

[0114] Figure 9 Another example is illustrated, which can be performed by at least one network access node 901 and / or UE 902. In this example, the network access node instructs the UE that it will not send a reference signal that can be used for time-frequency synchronization within the next x milliseconds (e.g., within a predetermined time period).

[0115] It should be understood that, despite Figure 9 The example refers to an instance where a TCI state change process is being executed, but the same approach can be used when the process is an initial TCI state activation process.

[0116] During period 9001, network access node 901 transmits a reference signal. The reference signal can be received by UE 902. UE 902 can perform one or more measurements on the reference signal received at UE according to the measurement configuration at UE 902.

[0117] During 9002, UE 902 sends a signaling notification to network access node 901. This signaling may include a report based on measurements performed on a reference signal received at the UE. The report may be sent according to the report configuration. The report may include a Layer 1 (L1) Reference Signal Received Power (RSRP) report. For example, the signaling of 9002 may include one or more values ​​corresponding to at least one RSRP measurement performed on the reference signal.

[0118] During period 9003, the network access node determines, based on the report received during period 9002, that the active TCI state maintained at the UE should be updated. In other words, during period 9003, it is determined that at least one of the active TCI states maintained at the UE should be changed to another TCI state.

[0119] During 9003, network access node 901 can also determine that network access node 901 does not intend to send any reference signal that can be used for time-frequency synchronization of another TCI state in the next x seconds, where the value of x can be configured by the operator (e.g., via operation and management functions), set by 3GPP specifications, or determined in any other way.

[0120] During period 9004, network access node 901 sends a signaling notification to UE 902. This signaling may include a command to change the active TCI state maintained at UE 902. The signaling may also include information instructing network access node 901 not to send any reference signals that could be used for time-frequency synchronization of another TCI state for the next x seconds.

[0121] Although not shown, between 9004 and 9005, the UE can determine whether time-frequency synchronization needs to be performed for another TCI state. When it is determined that time-frequency synchronization is not required, the method can be based on... Figure 10 The example continues. When it is determined that time-frequency synchronization is indeed necessary, UE 902 proceeds to 9005.

[0122] During 9005, UE 902, based on signaling from 9004, signals a request to transmit a reference signal for time-frequency synchronization with another TCI state. For example, based on this information instructing the network access node not to transmit any of the aforementioned reference signals, the UE can send an on-demand SSB transmission request to the network access node 901. This transmission of the on-demand SSB transmission request can be executed regardless of any timers running on the UE that control when the SSB transmission request will be executed. In other words, based on this information instructing the network access node not to transmit any of the aforementioned reference signals, the UE can override any existing timers associated with the on-demand SSB transmission request.

[0123] During 9006, network access node 901 sends a reference signal for time-frequency synchronization at the UE based on the signaling of 9005.

[0124] During 9007, UE 902 performs time-frequency synchronization with network access node 901 based on another received reference signal.

[0125] Furthermore, during 9008, the UE activates the TCI state indicated by the command in 9004. This may involve sending information to the network access node instructing the UE to be in time-frequency synchronization with a reference signal corresponding to another TCI state. This can take the form of Hybrid Automatic Repeat Request (HARQ), measurement reports, etc.

[0126] Although not shown, after the UE activates the TCI state indicated in the TCI state activation command, the network access node can allocate resources based on the active TCI state maintained at the UE. Resource allocation can be instructed to the UE via a DCI command, whereby the UE is instructed to switch to the active TCI state.

[0127] In other variations of the above, the network access node can be configured to transmit only SSB beams with which the target TCI state has a QCL relationship, based on a request for SSB transmission received from a UE that has been instructed to perform a TCI state change (e.g., the network access node does not transmit SSB beams with a target TCI state that does not have a QCL to be activated at the UE). This can be advantageous because less time-frequency synchronization is required for SSB transmissions for TCI state changes compared to current practices. This approach can be particularly useful when the network access node receives on-demand SSB requests only from one specific direction.

[0128] In another example, when the target TCI state is a known TCI, the UE may not need to perform time-frequency synchronization. In this case, the UE does not send an SSB transmission request. See below for reference. Figure 10 Further explanation.

[0129] In another example, the UE can provide information in the L1-RSRP report indicating the reference signal with which it synchronizes before the TCI state switch. When the network access node determines that the target TCI state to be activated at the UE (such as that sent in MAC-CE) is associated with the reference signal with which the UE has already indicated its synchronization in the L1-RSRP report, on-demand SSB or temporary reference signal transmission is no longer required. In this case, the UE does not send a request for SSB transmission.

[0130] In this scenario, the UE can synchronize with the reference signal for y seconds. When y seconds have elapsed, the network access node can be configured to send an SSB and / or another reference signal so that the UE can perform time-frequency synchronization after a TCI state change.

[0131] These subsequent examples involve scenarios where the UE does not need to perform time-frequency synchronization after a TCI state change. In this case, the network access node does not need to send an SSB (or any other reference signal) for this purpose.

[0132] For example, during the L1-RSRP measurement and evaluation period, the UE may determine that the RSRP difference between two reference signals measured by the UE is less than a threshold amount (e.g., less than z dB). In this case, the UE can omit the measurement information associated with one of these reference signals from the L1-RSRP report when at least one of the following conditions is met: • The TCI state associated with the reference signal that the UE has already measured is an unknown (e.g., inactive) TCI state. • The reference signal that the UE has measured has no QCL relationship with the reference signal corresponding to the TCI state, which is part of the UE's list of active TCI states.

[0133] The network access node can use the omitted information to infer that the omitted reference signal is unrelated to any future mobility process and / or change of the TCI state(s) activated at the UE.

[0134] In another example, the UE can include information in the L1-RSRP report indicating that the UE is synchronizing with a specific RS, and time-frequency synchronization is no longer required (and therefore SSB transmission is not required) in the following cases: • The reference signal that the UE has measured has a QCL relationship with the reference signal of the TCI state, which is part of the UE's list of active TCI states. • The reference signal is associated with a TCI state, which is a known TCI state; • The reference signal and the reference signal associated with a known TCI state have a QCL relationship.

[0135] These examples are about Figure 10 The implementation example is used to illustrate this.

[0136] Figure 10 At least one example of the above examples is shown, in which the UE does not need to perform time-frequency synchronization as part of a TCI state change. Figure 10 The diagram can be implemented by network access node 1001 and / or UE 1002.

[0137] During period 10001, network access node 1001 transmits a reference signal. The reference signal can be received by UE 1002. UE 1002 can perform one or more measurements on the reference signal received at UE 1002 according to the measurement configuration at UE 1002.

[0138] During period 10002, UE 1002 sends a signaling notification to network access node 1001. This signaling may include a report based on measurements performed on a reference signal received at the UE. The report may be sent according to a report configuration. The report may include a Layer 1 (L1) Reference Signal Received Power (RSRP) report. For example, the signaling of 10002 may include one or more values ​​corresponding to at least one RSRP measurement performed on the reference signal. The signaling of 10002 may be based on a first active TCI state associated with the first reference signal.

[0139] During period 10003, network access node 1001 sends a MAC-CE to UE 1002, which includes information indicating one or more TCI states that will be activated at UE 1002. In this example, the MAC-CE indicates that a second TCI state (associated with a second reference signal) and a third TCI state (associated with a third reference signal) will be activated at UE 1002.

[0140] During period 10004, network access node 1001 sends reference signal 4 and reference signal 5, wherein reference signal 4 has a QCL relationship with reference signal 2, and reference signal 5 has no QCL relationship with any of the reference signals 1 to 3.

[0141] During period 10005, UE 1002 sends a signaling notification to network access node 1001. This signaling may include a report based on measurements performed on a reference signal received at the UE during period 10004. The report may be sent according to the report configuration. The report may include a Layer 1 (L1) Reference Signal Received Power (RSRP) report. For example, the signaling of 10005 may include one or more values ​​corresponding to at least one RSRP measurement performed on the reference signal. The signaling of 10005 may be based on reference signal 4 instead of reference signal 5.

[0142] During period 10006, network access node 1001 uses the report from 10005 to determine that the UE has synchronized with the new TCI state. Based on this determination, network access node 1001 can continue to allocate resources to the UE corresponding to the new TCI state.

[0143] As mentioned above, Figures 7 to 10 The features of the example are about Figures 11 to 17 The following example illustrates this.

[0144] Figures 11 to 17 It shows in Figure 7 One or more example methods can be deployed in the implementation examples.

[0145] exist Figure 11 and Figure 12 In the example, the network access node notifies the UE of the time when the next SSB will be sent. This information can be indicated using at least one of a MAC-CE for TCI state switching or a MAC-CE for TCI state activation. The next SSB can be sent as a result of a request from another UE or as a result of the network access node's configuration (e.g., sending SSBs aperiodically).

[0146] Figure 11 The illustration depicts one or more methods that can be performed by a device. The device may include a UE. The device may be included in the UE. The UE may be as described above regarding... Figure 3 As stated above.

[0147] During 1101, the device receives first information from the network access node, the first information indicating that the device wants to set the first active transmission configuration indicator (TCI) state to the active TCI state of the device.

[0148] During 1102, the device receives second information from the network access node, which indicates that the network access node will send at least one synchronization signal block within the indicated duration.

[0149] During 1103, the device receives at least one synchronization signal block based on the received information before activating the first TCI state.

[0150] Activating the first TCI state may include: signaling to the network access node a hybrid automatic repeat request and / or acknowledgment and / or measurement report referencing the first TCI state. Activating the first TCI state may include instructing the network access node that the device is time-frequency synchronized with a reference signal corresponding to the first TCI state. Activating the first TCI state may include receiving resource allocation information for resources that have a quasi-co-addressable relationship with the resources of the reference signal corresponding to the first TCI state.

[0151] In this example (and other examples in this specification), it should be understood that when a reference signal is associated with a TCI state, the reference signal can correspond to a TCI state. In other words, when the mapping that associates a reference signal with a TCI state is maintained, the reference signal can correspond to a TCI state. This mapping can also maintain the association between signals quasi-co-located with the reference signal corresponding to the TCI state.

[0152] Figure 12 The illustration depicts one or more methods that can be performed by a device. The device may include a network access node. The device may be included within a network access node. The network access node may be combined as described above. Figure 2 As stated above.

[0153] During 1201, the device sends a first message to the user equipment, indicating that the user equipment wants to set the first active Transport Configuration Indicator (TCI) state to the active TCI state of the user equipment. The user equipment can be... Figure 11 User equipment in the system.

[0154] During 1202, the device sends a second message to the user equipment, indicating that the device will send at least one synchronization signal block within the indicated duration.

[0155] During 1203, the device sends at least one synchronization signal block based on the second information.

[0156] Figure 12 The device can receive a request to send a synchronization signal block from another user equipment, wherein sending second information is performed based on the received request. In other words, 1202 can depend on (e.g., rely on). Figure 12 The device determines that it has received a request to perform an SSB transmission within the indicated duration. However, it should be understood that 1202 may be performed based on other criteria being met. For example, even if an on-demand SSB request has not yet been received from another UE, the network access node may determine that it is scheduled to send an SSB within the indicated duration (e.g., based on timer expiration and / or based on an established period, etc.).

[0157] Figure 12 The device can determine that it is configured to send a synchronization signal block during a predetermined duration during which the first information is sent, wherein the sending of the second information is performed based on this determination.

[0158] The following items are applicable Figures 11 to 12The second information may include at least one of the following: an indication of when the network access node will send at least one synchronization block; an indication of when the network access node will send at least one synchronization block before it; an instruction to avoid signaling the network access node to a request for the transmission of a synchronization block; or an indication that the network access node has been triggered to send a synchronization block.

[0159] exist Figures 13 to 14 In the example, the network access node informs the UE of the time when a temporary reference signal (e.g., a path loss reference signal) will be transmitted after the most recent SSB transmission. The temporary reference signal can be used for time-frequency synchronization. For example, information about the temporary reference signal can be indicated using at least one of a MAC-CE for TCI state switching or a MAC-CE for TCI state activation.

[0160] Figure 13 The illustration depicts one or more methods that can be performed by a device. The device may include a UE. The device may be included in the UE. The UE may be as described above regarding... Figure 3 As stated above.

[0161] During 1301, the device receives first information from the network access node, the first information indicating that the device wants to set the first active transmission configuration indicator (TCI) state to the active TCI state of the device.

[0162] During 1302, the device receives second information from the network access node, the second information indicating that the network access node will send at least one reference signal within the indicated duration, wherein the at least one reference signal does not include a synchronization signal block.

[0163] During 1303, the device receives at least one reference signal based on the received information before activating the first TCI state.

[0164] Activating the first TCI state may include signaling to the network access node a hybrid automatic repeat request and / or acknowledgment and / or measurement report referencing the first TCI state. Activating the first TCI state may include instructing the network access node that the device is time-frequency synchronized with a reference signal corresponding to the first TCI state. Activating the first TCI state may include receiving resource allocation information for resources that have a quasi-co-addressable relationship with the resources of the reference signal corresponding to the first TCI state.

[0165] The device can also perform time-frequency synchronization based on at least one reference signal to perform at least one of the following: activating a first TCI state or switching from a second TCI state to a first TCI state.

[0166] The device can provide network access nodes with its capability information, which indicates whether the device can request the transmission of a synchronization signal block and / or whether the device can perform time-frequency synchronization based on at least one reference signal.

[0167] Figure 14 The illustration depicts one or more methods that can be performed by a device. The device may include a network access node. The device may be included within a network access node. The network access node may be combined as described above. Figure 2 As stated above.

[0168] During step 1401, the device sends a first message to the user equipment, indicating that the user equipment wishes to set the first active Transport Configuration Indicator (TCI) state to its active TCI state. The user equipment can be... Figure 13 User equipment in the system.

[0169] During 1402, the device sends a second message to the user equipment, the second message indicating that the device will send at least one reference signal within the indicated duration, wherein the at least one reference signal does not include a synchronization signal block.

[0170] During 1403, the device transmits at least one reference signal based on the second information.

[0171] Figure 14 The device can determine that it is configured to transmit a reference signal during a predetermined duration for which the first information is transmitted, wherein the transmission of the second information is performed based on this determination.

[0172] The device can receive capability information from the user equipment, which indicates whether the user equipment is able to request the transmission of a reference signal.

[0173] exist Figures 13 to 14 In any of the examples, the second information may include at least one of the following: an indication of the time when the network access node will send at least one reference signal; an indication of the time when the network access node will send at least one reference signal before it; an instruction to avoid signaling the network access node to the request for the transmission of the reference signal; or an indication that the network access node has been triggered to send the reference signal and / or whether the device is capable of performing time-frequency synchronization based on at least one reference signal.

[0174] exist Figures 15 to 16In the example, the network access node notifies the UE that it will not send an SSB and / or other temporary reference signals for time-frequency synchronization within a predetermined time frame (e.g., within a predetermined duration). The UE can determine whether time-frequency synchronization needs to be performed, and if the UE determines that time-frequency synchronization needs to be performed, the UE causes an on-demand SSB request to be sent to the network access node. Information regarding the temporary reference signals can be indicated, for example, using at least one of a MAC-CE for TCI state switching or a MAC-CE for TCI state activation.

[0175] Figure 15 The illustration depicts one or more methods that can be performed by a device. The device may include a UE. The device may be included in the UE. The UE may be as described above regarding... Figure 3 As stated above.

[0176] During 1501, the device receives first information from the network access node, the first information indicating that the device wants to set the first transmission configuration indicator (TCI) state to the active TCI state of the device.

[0177] During period 1502, the device receives second information from the network access node, which indicates that the network access node will not send at least one reference signal for synchronization during the indicated duration.

[0178] During step 1503, the device sends a request to the network access node for the transmission of at least one reference signal used for synchronization.

[0179] During 1504, the device receives at least one reference signal for synchronization from the network access node based on the request.

[0180] Activating the first TCI state may include: signaling to the network access node a hybrid automatic repeat request and / or acknowledgment and / or measurement report referencing the first TCI state. Activating the first TCI state may also include: instructing the network access node that the device is time-frequency synchronized with a reference signal corresponding to the first TCI state. Activating the first TCI state may further include: receiving resource allocation information for resources that have a quasi-co-addressable relationship with the resources of the reference signal corresponding to the first TCI state.

[0181] The device can also perform time-frequency synchronization based on at least one reference signal to perform at least one of the following: activating a first TCI state or switching from a second TCI state to a first TCI state.

[0182] The device can provide network access nodes with its capability information, which indicates whether the device can request the transmission of a synchronization signal block and / or whether the device can perform time-frequency synchronization based on at least one reference signal.

[0183] The following items are applicable Figure 11 and Figure 13 Any one of the examples (e.g., one or more examples, including all examples).

[0184] Based on the reception of the second information, the device can avoid sending requests for synchronization signal block transmissions to the network access node. For example, when the second information indicates the time when the network access node will transmit an SSB or another reference signal, the device can determine that the time is within a predetermined duration of the reception of the TCI state change, and based on this determination, avoid sending requests for on-demand SSB transmissions.

[0185] The following items are applicable Figure 11 , Figure 13 and Figure 15 Any one of the examples (e.g., one or more examples, including all examples).

[0186] The first and second messages can be received via the same signaling process.

[0187] The first and second information can be received through different signaling processes.

[0188] At least one of the first or second information can be received via the media access control control element.

[0189] At least one of the first or second information can be received via downlink control information.

[0190] The device can also be configured to perform time-frequency synchronization based on at least one synchronization signal block to perform at least one of the following: initially activating a first TCI state or switching from a second TCI state to a first TCI state.

[0191] The device (e.g., the UE) may have previously indicated to the network access node that it is capable of using information similar to the second piece of information, so that the network access node does not waste resources providing it to a UE that cannot effectively utilize it. Therefore, the device may provide the network access node with its capability information, which indicates whether the device is capable of requesting synchronization signal block transmission.

[0192] Figure 16 The illustration depicts one or more methods that can be performed by a device. The device may include a network access node. The device may be included within a network access node. The network access node may be combined as described above. Figure 2 As stated above.

[0193] During 1601, the device sends a first message to the user equipment, the first message indicating that the user equipment wants to set the first transmission configuration indicator (TCI) state to the active TCI state of the user equipment.

[0194] During 1602, the device sends a second message to the user equipment, indicating that the device will not send at least one reference signal for synchronization during the indicated duration.

[0195] During 1603, the device receives a request from the user equipment for the transmission of at least one reference signal for synchronization.

[0196] During 1604, the device sends at least one reference signal for synchronization to the user equipment based on the request.

[0197] Figure 16 The device can determine that it is not configured to send a reference signal during a predetermined duration when the first information is sent, wherein sending the second information is performed based on this determination.

[0198] The device can receive capability information from the user equipment, which indicates whether the user equipment is able to request the transmission of a reference signal.

[0199] exist Figures 15 to 16 In any of the examples, the second information may include at least one of the following: an indication of the time when the network access node will send at least one reference signal; an indication of the time when the network access node will send at least one reference signal before it; an instruction to avoid signaling the network access node to the request for the transmission of the reference signal; or an indication that the network access node has been triggered to send the reference signal and / or whether the device is capable of performing time-frequency synchronization based on at least one reference signal.

[0200] The following items are applicable Figure 12 , Figure 14 and Figure 16 Any one of the examples (e.g., one or more examples, including all examples).

[0201] The first and second messages can be sent via the same signaling process.

[0202] The first and second information can be sent via different signaling processes.

[0203] At least one of the first or second information can be sent via the media access control control element.

[0204] At least one of the first or second information can be sent via downlink control information.

[0205] As described above, the device corresponding to the network access node can receive capability information, which indicates the UE's ability to efficiently receive and / or use the second information. For example, the device can receive capability information of the user equipment, wherein the capability information indicates whether the user equipment is able to request the transmission of a synchronization signal block.

[0206] As mentioned above, there can be a situation where the UE does not need to perform time-frequency synchronization after receiving the TCI state activation command and / or TCI state switching command, because the UE has already been time-frequency synchronized to signal on resources based on the active TCI state to be maintained at the UE. The following examples illustrate at least one example method that can be performed in this situation.

[0207] Figure 17 The illustration depicts one or more methods that can be performed by a device. The device may include a UE. The device may be included in the UE. The UE may be as described above regarding... Figure 3 As stated above.

[0208] During 1701, the device receives first information from the network access node, the first information indicating that the device wants to set the first active transmission configuration indicator (TCI) state to the active TCI state of the device.

[0209] During 1702, when the first information is received, the device determines that it includes time-frequency synchronization information for the first TCI state.

[0210] During 1703, the device activates the first TCI state based on this determination, without performing time-frequency synchronization with the first reference signal corresponding to the first TCI state.

[0211] Activating the first TCI state can be done as described above. Figures 11 to 16 Any one of them.

[0212] Activating the first TCI state may include performing at least one signal quality metric measurement on the first reference signal and / or another reference signal quasi-co-located with the first reference signal before receiving the first information, and sending a measurement report to the network access node including at least one value corresponding to the at least one signal quality metric. The measurement report may include a Layer 1 reference signal received power report.

[0213] Figure 17The device can receive a second reference signal from a network access node and determine that the second reference signal corresponds to at least one of the following: a reference signal having a quasi-co-address relationship with a reference signal corresponding to a TCI state activated at the device; a reference signal having a quasi-co-address relationship with a reference signal corresponding to a TCI state known to the device; or a reference signal associated with a reference signal corresponding to a TCI state known to the device. Based on this determination, the device can send information to the network access node indicating that the device is synchronized with the first reference signal.

[0214] In other words, when at least one of the following conditions is met, the UE can indicate in the L1-RSRP report that it is synchronizing with the reference signal (which can be explicitly identified by the UE), and T / F synchronization is no longer required, and therefore SSB transmission is not required: (i) The reference signal measured by the UE has a QCL relationship with the reference signal of the TCI state, which is maintained as an active TCI state at the UE (e.g., the TCI state is on the active TCI list maintained at the UE). (ii) A reference signal is associated with a TCI state (e.g., via mapping as described above), which is a known TCI state at the UE; or (iii) The reference signal has a QCL relationship with the reference signal associated with the TCI state, which is a known TCI state at the UE.

[0215] It should be understood that since the first information relates to activating the first TCI state (e.g., which corresponds to the first TCI reference signal), the reference signal in i) may correspond to a different reference signal than the first reference signal (e.g., the first TCI state is not on the list of active TCI states before the first information is received). However, the first reference signal may be the reference signal mentioned in ii) and iii) because the first TCI state may be a "known TCI state" before the second information is received, although it should be understood that in some examples, the first reference signal may not be the reference signal mentioned in ii) and iii).

[0216] Sending information instructing the device to synchronize with the first reference signal may include sending information instructing the device to synchronize with the first reference signal using a measurement report (e.g., using the L1-RSRP report described above).

[0217] The device can receive a third reference signal from a network access node, receive a fourth reference signal from the network access node, determine a corresponding value of a signal quality metric representing each of the third and fourth reference signals, determine that the corresponding values ​​differ from each other by less than a threshold amount, and determine at least one of the following: the fourth reference signal corresponds to a reference signal corresponding to a TCI state unknown to the device, or the fourth reference signal has no quasi-co-address relationship with a reference signal corresponding to a TCI state activated at the device. Based on the first two determinations, the device sends a measurement report to the network access node, which omits the signal quality metric information related to the fourth reference signal. In this example, the third reference signal can be a first reference signal or another reference signal. The signal quality metric can include at least one of reference signal received power or reference signal received quality.

[0218] The measurement report sent, which omits information related to the fourth reference signal, may include a corresponding value for a signal quality metric representing the third reference signal.

[0219] As described above, the measurement report may include a Layer 1 reference signal received power report.

[0220] At least one of the second reference signal, the third reference signal, or the fourth reference signal is the first reference signal or another reference signal that has a quasi-co-address relationship with the first reference signal.

[0221] Although not shown, it should be understood that it is possible to exist with Figure 17 The network access node interacts with the device. This network access node can determine its identity based on 1703 signaling. Figure 17 The UE is time-frequency synchronized with an appropriate reference signal (e.g., a first reference signal corresponding to a first TCI state), and based on this determination, resources are allocated to the UE based on the activation of the first TCI state at the UE (e.g., resources with a QCL relationship to the resource set of the TCI state). This allocation can be signaled to the UE. Figure 17 The UE can send and / or receive signals according to the allocation of signal notification.

[0222] It should be understood that, Figures 11 to 17In the example, after the UE activates a TCI state signaled by the network access node (e.g., as part of an initial TCI state activation command and / or as part of a TCI state switching command), the network access node can allocate resources to the UE based on the activated TCI state for at least one of uplink or downlink communication. In other words, the network access node can allocate resources to the UE where these resources are associated with the activated TCI state (e.g., via a mapping between the TCI state and a resource pool identifying the resources, and / or via a mapping between a reference signal of the TCI state and a resource pool identifying the resources). The allocation of resources can be instructed to the UE. For example, the allocation of resources can be instructed to the UE via a DCI command, where the UE is instructed to switch to the active TCI state. The UE can then use the allocated resources for communication.

[0223] It should be understood that these devices may include or be coupled to other units or modules, such as wireless components or wireless headends for transmission and / or reception. Although these devices are described as a single entity, different modules and memories may be implemented in one or more physical or logical entities.

[0224] It should be noted that while some embodiments have been described for 5G networks, similar principles can be applied to other networks and communication systems. Therefore, although certain embodiments have been described by way of example with reference to certain example architectures of wireless networks, technologies, and standards, these embodiments can be applied to any other suitable form of communication system besides those shown and described herein.

[0225] It should also be noted that although exemplary embodiments have been described above, various changes and modifications can be made to the disclosed solutions without departing from the scope of the present invention.

[0226] As used herein, “at least one of the following: ” and “at least one of the following: ” and similar wording (where the list of two or more elements is connected by “and” or “or”) means at least any one of these elements, or at least any two or more of these elements, or at least all of these elements.

[0227] Generally, various embodiments can be implemented in hardware or special-purpose circuit systems, software, logic, or any combination thereof. Some aspects of this disclosure can be implemented in hardware, while others can be implemented in firmware or software that can be executed by a controller, microprocessor, or other computing device, but this disclosure is not limited thereto. While various aspects of this disclosure may be shown and described as block diagrams, flowcharts, or using some other graphical representation, it should be understood that, as non-limiting examples, the blocks, devices, systems, techniques, or methods described herein can be implemented in hardware, software, firmware, special-purpose circuits or logic, general-purpose hardware or controllers or other computing devices, or some combination thereof.

[0228] As used herein, the term "circuit system" may refer to one or more or all of the following: (a) Hardware circuit implementation only (such as implementation in analog and / or digital circuit systems only), and (b) A combination of hardware circuitry and software, such as (if applicable): (i) A combination of (multiple) analog and / or digital hardware circuit systems with software / firmware, and (ii) Any part of a hardware processor (including a digital signal processor), software, and memory (including a plurality of) that works together to enable a device such as a mobile phone or server to perform various functions, and (c) (Multiple) hardware circuits and / or (multiple) processors, such as (multiple) microprocessors or a portion thereof, which require software (e.g., firmware) to operate, but may be absent when operation is not required.

[0229] This definition of circuit system applies to all uses of the term herein, including in any claim. As another example, as used herein, the term circuit system also covers implementations of hardware circuitry or processors (or processors) or portions thereof and their accompanying software and / or firmware. For instance, if applicable to a particular claim element, the term circuit system also covers baseband integrated circuits or processor integrated circuits for mobile devices, or similar integrated circuits in servers, cellular network devices, or other computing or networking devices.

[0230] The exemplary embodiments of this disclosure can be implemented by computer software executable by the data processor of a mobile device, such as in a processor entity, or by hardware, or by a combination of software and hardware. Computer software or programs (also referred to as program products, including software routines, applets, and / or macros) can be stored in any device-readable data storage medium, and they include program instructions for performing a specific task. A computer program product may include one or more computer-executable components that, when the program is run, are configured to perform the embodiments. The one or more computer-executable components may be at least one piece of software code or a portion thereof.

[0231] Furthermore, it should be noted in this regard that any block of the logic flow shown in the figure can represent a program step, or an interconnected logic circuit, block and function, or a combination of program steps and logic circuits, blocks and functions. Software can be stored on physical media implemented within a processor, such as memory chips or memory blocks; magnetic media, such as hard disks or floppy disks; and optical media, such as DVDs and their data variants, CDs, etc. The physical medium is a non-transitory medium.

[0232] As used herein, the term “non-transient” refers to a limitation on the medium itself (i.e., tangible, not signaling), rather than a limitation on the persistence of data storage (e.g., RAM vs. ROM).

[0233] The memory can be of any type suitable for the local technical environment and can be implemented using any suitable data storage technology, such as semiconductor-based memory devices, magnetic memory devices and systems, optical memory devices and systems, fixed memory, and removable memory. The data processor can be of any type suitable for the local technical environment and can include one or more of the following as non-limiting examples: general-purpose computers, special-purpose computers, microprocessors, digital signal processors (DSPs), application-specific integrated circuits (ASICs), FPGAs, gate-level circuits, and processors based on multi-core processor architectures.

[0234] The various exemplary embodiments of this disclosure can be implemented in a variety of components, such as integrated circuit modules. The design of integrated circuits is largely a highly automated process. Complex and powerful software tools can be used to translate logic-level designs into semiconductor circuit designs for etching and formation on semiconductor substrates.

[0235] The independent claims define the scope of protection sought by the various exemplary embodiments of this disclosure. Exemplary embodiments and features (if any) described in this disclosure that are not within the scope of the independent claims shall be interpreted as examples that aid in understanding the various exemplary embodiments of this disclosure.

[0236] The foregoing description provides a complete and informative description of various exemplary embodiments of the present disclosure by way of non-limiting and illustrative examples. However, various modifications and adjustments will become apparent to those skilled in the art when read in conjunction with the accompanying drawings and claims, given the foregoing description. Nevertheless, all such modifications and similar alterations to the teachings will still fall within the scope of the various exemplary embodiments of the present disclosure set forth in the claims. As a non-limiting and illustrative example, another exemplary embodiment exists, which includes a combination of one or more exemplary embodiments with any other exemplary embodiments previously discussed.

Claims

1. A device for communication, comprising: At least one processor; as well as At least one memory, including code, which, when executed by the at least one processor, causes the device to perform: The device receives first information from the network access node, the first information indicating that the device wants to set the first transmission configuration indicator (TCI) state to the active TCI state of the device. The network access node receives second information indicating that it will not send at least one reference signal for synchronization during the indicated duration. Send a request to the network access node for the transmission of at least one reference signal for synchronization; as well as Based on the request, the at least one reference signal for synchronization is received from the network access node.

2. The apparatus of claim 1, wherein the first information and the second information are received via the same signaling process and / or via different signaling processes; and At least one of the first information or the second information is received via a media access control element and / or via downlink control information.

3. The apparatus according to any one of the preceding claims, wherein the apparatus is further caused to perform at least one of the following: Time-frequency synchronization is performed based on the at least one reference signal to perform at least one of the following: activating the first TCI state or switching from the second TCI state to the first TCI state; or The network access node is provided with capability information of the device, wherein the capability information indicates whether the device is able to request the transmission of a synchronization signal block and / or whether the device is able to perform time-frequency synchronization based on the at least one reference signal.

4. A device for communication, comprising: At least one processor; as well as At least one memory, including code, which, when executed by the at least one processor, causes the device to perform: Send a first message to the user equipment, the first message indicating that the user equipment wants to set the first transmission configuration indicator (TCI) state to the active TCI state of the user equipment; Send a second message to the user equipment, the second message indicating that the device will not send at least one reference signal for synchronization during the indicated duration; Receive a request from the user equipment for the transmission of at least one reference signal for synchronization; as well as Based on the request, at least one reference signal for synchronization is sent to the user equipment.

5. The apparatus of claim 4, wherein the apparatus is further caused to perform: It is determined that the device is not configured to transmit the reference signal within a predetermined duration during which the first information is transmitted, wherein the transmission of the second information is performed based on the determination.

6. The apparatus of claim 4, wherein the first information and the second information are transmitted via the same signaling process and / or via different signaling processes; and The first information or the second information is transmitted via a media access control element and / or via downlink control information.

7. The apparatus according to any one of claims 4 to 6, wherein the apparatus is further caused to perform: Receive capability information from the user equipment, wherein the capability information indicates whether the user equipment is able to request reference signal transmission.

8. The apparatus according to any one of claims 4 to 6, wherein the second information comprises at least one of the following: The network access node will send an indication of the time for sending the at least one reference signal; The network access node will indicate the time at which it previously sent the at least one reference signal; Avoid sending signals to the network access node to notify the request for reference signal transmission; or The network access node has been triggered to send a reference signal and / or an indication of whether the device is capable of performing time-frequency synchronization based on the at least one reference signal.

9. A method for an apparatus for communication, the method comprising: The device receives first information from the network access node, the first information indicating that the device wants to set the first transmission configuration indicator (TCI) state to the active TCI state of the device. The network access node receives second information indicating that it will not send at least one reference signal for synchronization during the indicated duration. Send a request to the network access node for the transmission of at least one reference signal for synchronization; as well as Based on the request, the at least one reference signal for synchronization is received from the network access node.

10. A method for an apparatus for communication, the method comprising: Send a first message to the user equipment, the first message indicating that the user equipment wants to set the first transmission configuration indicator (TCI) state to the active TCI state of the user equipment; Send a second message to the user equipment, the second message indicating that the device will not send at least one reference signal for synchronization during the indicated duration; Receive a request from the user equipment for the transmission of at least one reference signal for synchronization; as well as Based on the request, at least one reference signal for synchronization is sent to the user equipment.

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