Random access response configuration for lower layer triggered mobility

Abstract

Various aspects of the present disclosure generally relate to wireless communications. In some aspects, a user equipment (UE) may receive a physical downlink control channel (PDCCH) command from a first serving cell. The UE may transmit a physical random access channel (PRACH) transmission to the candidate cell. The UE may receive a random access response (RAR) configuration for a random access response (RAR) transmission on one of a first serving cell, a second serving cell, or a candidate cell. Numerous other aspects are described.

Description

Technical Field

[0001] All aspects of this disclosure relate to wireless communication in general, and to techniques and apparatus for configuring random access responses. Background Technology

[0002] Wireless communication systems are widely deployed to provide a variety of telecommunications services, such as telephone, video, data, messaging, and broadcasting. Typical wireless communication systems employ multiple access technologies that enable communication with multiple users by sharing available system resources (e.g., bandwidth, transmit power, etc.). Examples of such multiple access technologies include Code Division Multiple Access (CDMA) systems, Time Division Multiple Access (TDMA) systems, Frequency Division Multiple Access (FDMA) systems, Orthogonal Frequency Division Multiple Access (OFDMA) systems, Single Carrier Frequency Division Multiple Access (SC-FDMA) systems, Time Division Synchronous Code Division Multiple Access (TD-SCDMA) systems, and Long Term Evolution (LTE). LTE / LTE-Advanced is a set of enhancements to the Universal Mobile Telecommunications System (UMTS) mobile standard issued by the 3rd Generation Partnership Project (3GPP).

[0003] A wireless network may include one or more network nodes that support communication for wireless communication devices, such as user equipment (UE) or multiple UEs. A UE may communicate with network nodes via downlink and uplink communication. A "downlink" (or "DL") refers to the communication link from the network node to the UE, and an "uplink" (or "UL") refers to the communication link from the UE to the network node. Some wireless networks may support device-to-device communication, such as via local links (e.g., sidelinks (SL), wireless local area network (WLAN) links, and / or wireless personal area network (WPAN) links, etc.).

[0004] The aforementioned multiple access technologies have been adopted in various telecommunications standards to provide a common protocol that enables different UEs to communicate at the city, country, region, and / or global levels. New Radio (NR) (which may be referred to as 5G) is a set of enhancements to the LTE mobile standard issued by 3GPP. NR is designed to better support mobile broadband internet access by using Orthogonal Frequency Division Multiplexing (OFDM) with a Cyclic Prefix (CP) on the downlink (CP-OFDM), and CP-OFDM and / or Single Carrier Frequency Division Multiplexing (SC-FDM) (also known as Discrete Fourier Transform Extended OFDM (DFT-s-OFDM)) on the uplink, as well as supporting beamforming, multiple-input multiple-output (MIMO) antenna technologies and carrier aggregation to improve spectral efficiency, reduce costs, improve service, utilize new spectrum, and better integrate with other open standards. Further improvements to LTE, NR, and other radio access technologies remain useful as the demand for mobile broadband access continues to increase. Summary of the Invention

[0005] Some aspects described herein relate to a user equipment (UE) for wireless communication. The UE may include memory and one or more processors coupled to the memory. The one or more processors may be configured to receive physical downlink control channel (PDCCH) commands from a first serving cell. The one or more processors may be configured to send physical random access channel (PRACH) transmissions to a candidate cell. The one or more processors may be configured to receive RAR configurations for sending random access response (RAR) transmissions on one of the first serving cell, a second serving cell, or a candidate cell.

[0006] Some aspects described herein relate to a network node for wireless communication. The network node may include memory and one or more processors coupled to the memory. One or more processors may be configured to transmit PDCCH commands. One or more processors may be configured to configure a UE to transmit PRACH transmissions to a candidate cell. One or more processors may be configured to output RAR configurations for RAR transmissions on one of a first serving cell, a second serving cell, or a candidate cell.

[0007] Some aspects described herein relate to a method for wireless communication performed by a UE. The method may include receiving a PDCCH command from a first serving cell. The method may include sending a PRACH transmission to a candidate cell. The method may include receiving a RAR configuration for RAR transmission on one of the first serving cell, a second serving cell, or a candidate cell.

[0008] Some aspects described herein relate to a method for wireless communication performed by a network node. The method may include sending a PDCCH command. The method may include configuring a UE to send PRACH transmissions to a candidate cell. The method may include outputting a RAR configuration for RAR transmissions on one of a first serving cell, a second serving cell, or a candidate cell.

[0009] Some aspects described herein relate to a non-transitory computer-readable medium storing a set of instructions for wireless communication by a UE. When executed by one or more processors of the UE, the set of instructions enables the UE to receive a PDCCH command from a first serving cell. When executed by one or more processors of the UE, the set of instructions enables the UE to send a PRACH transmission to a candidate cell. When executed by one or more processors of the UE, the set of instructions enables the UE to receive a RAR configuration for RAR transmission on one of the first serving cell, a second serving cell, or a candidate cell.

[0010] Some aspects described herein relate to a non-transitory computer-readable medium storing a set of instructions for wireless communication by a network node. When executed by one or more processors of the network node, the set of instructions enables the network node to send PDCCH commands. When executed by one or more processors of the network node, the set of instructions enables the network node to configure a UE to send PRACH transmissions to a candidate cell. When executed by one or more processors of the network node, the set of instructions enables the network node to output a RAR configuration for RAR transmissions on one of a first serving cell, a second serving cell, or a candidate cell.

[0011] Some aspects described herein relate to an apparatus for wireless communication. The apparatus may include components for receiving PDCCH commands from a first serving cell. The apparatus may include components for transmitting PRACH transmissions to a candidate cell. The apparatus may include components for receiving RAR configurations for RAR transmissions on one of the first serving cell, a second serving cell, or a candidate cell.

[0012] Some aspects described herein relate to an apparatus for wireless communication. The apparatus may include components for transmitting PDCCH commands. The apparatus may include components for configuring a UE to transmit PRACH transmissions to a candidate cell. The apparatus may include components for outputting a RAR configuration for RAR transmissions on one of a first serving cell, a second serving cell, or a candidate cell.

[0013] The entirety of the categories includes methods, apparatus, systems, computer program products, non-transitory computer-readable media, UEs, base stations, network entities, network nodes, wireless communication devices, and / or processing systems as fully described herein with reference to the accompanying drawings and description and illustrated as illustrated in the drawings and description.

[0014] The features and technical advantages of the examples according to this disclosure have been summarized rather extensively above in order to provide a better understanding of the detailed description that follows. Additional features and advantages will be described below. The disclosed concepts and specific examples can be readily used as the basis for modifying or designing other structures for achieving the same purpose of this disclosure. Such equivalent constructions do not depart from the scope of the appended claims. The characteristics of the concepts disclosed herein, in both their organization and manner of operation, and the associated advantages, will be better understood by considering the following description in conjunction with the accompanying drawings. Each of the drawings provided is for illustrative and descriptive purposes and not as a definition of limitation of the claims.

[0015] While aspects are described herein by way of example, those skilled in the art will understand that such aspects can be implemented in many different arrangements and scenarios. The techniques described herein can be implemented using different platform types, devices, systems, shapes, sizes, and / or package arrangements. For example, some aspects can be implemented via integrated chip implementations or other devices based on non-modular components (e.g., end-user equipment, vehicles, communication equipment, computing devices, industrial equipment, retail / procurement equipment, medical devices, and / or artificial intelligence devices). Aspects can be implemented in chip-level components, modular components, non-modular components, non-chip-level components, device-level components, and / or system-level components. Devices incorporating the described aspects and features may include additional components and features for implementing and practicing the claimed and described aspects. For example, the transmission and reception of wireless signals may include one or more components for analog and digital purposes (e.g., hardware components including antennas, radio frequency (RF) chains, power amplifiers, modulators, buffers, processors, interleavers, adders, and / or summers). The aspects described herein are intended to be practiced in a wide variety of devices, components, systems, distributed arrangements, and / or end-user equipment of various sizes, shapes, and configurations. Attached Figure Description

[0016] To gain a full understanding of the foregoing features of this disclosure, a more specific description of the invention, briefly outlined above, can be obtained by referring to various aspects, some of which are illustrated in the accompanying drawings. However, it should be noted that the drawings illustrate only certain typical aspects of this disclosure and are therefore not to be considered as limiting its scope, as the description acknowledges other equally valid aspects. The same reference numerals in different drawings may identify the same or similar elements.

[0017] Figure 1 This is a diagram illustrating an example of a wireless network according to the present disclosure.

[0018] Figure 2 This is a diagram illustrating an example of communication between a network node and a user equipment (UE) in a wireless network according to the present disclosure.

[0019] Figure 3 This is a diagram illustrating an example decomposed base station architecture according to this disclosure.

[0020] Figure 4 This is a diagram illustrating examples of physical channels and reference signals in a wireless network according to this disclosure.

[0021] Figure 5 This is a diagram illustrating an example of Layer 1 / Layer 2 Triggered Mobility (LTM) according to this disclosure.

[0022] Figure 6This is a diagram illustrating an example of a random access response configuration associated with LTM according to this disclosure.

[0023] Figure 7 This is a diagram illustrating an example procedure performed by a UE according to this disclosure, for example.

[0024] Figure 8 This is a diagram illustrating an example process performed, for example, by a network node according to this disclosure.

[0025] Figure 9 This is a diagram of an example device for wireless communication according to the present disclosure.

[0026] Figure 10 This is a diagram of an example device for wireless communication according to the present disclosure. Detailed Implementation

[0027] Layer 1 (L1) / Layer 2 (L2) triggered mobility (LTM) allows network devices such as user equipment (UEs) to move seamlessly between network cells. In LTM, handover between network cells can be initiated by the UE based on measurements performed by the UE's L1 radio interface and L2 radio access technology. When the UE detects a weak signal in one cell, it can initiate a handover to another cell with a stronger signal.

[0028] A UE can initiate communication with a network cell using the Physical Random Access Channel (PRACH). For example, the UE can send a PRACH preamble to the cell, and the network cell can respond to the UE by sending a Physical Downlink Control Channel (PDCCH) command containing information such as time and frequency resources for PRACH communication. The network cell can respond to PRACH communication by sending a Random Access Response (RAR). The RAR may include information that the UE can use to communicate with the network cell via PRACH, such as a timing advance (TA) identifier and a random access preamble identifier, etc.

[0029] Although LTM supports PRACH transmission, handover to a neighboring cell may result in PRACH communication being sent to a different network cell (“new network cell”) than the network cell that sent the PDCCH command (“initial network cell”). This can create ambiguity for the UE, making it unclear whether the RAR will be sent from the new network cell or the initial network cell. This could lead to the UE missing the RAR transmission, for example, if it requests the RAR from the wrong network cell.

[0030] Some of the techniques and apparatus described herein enable a UE to receive PDCCH commands from a first serving cell, send PRACH transmissions to a candidate cell, and receive RAR configurations for RAR transmissions on one of the first serving cell, a second serving cell, or a candidate cell. Therefore, the UE is more likely to receive RAR transmissions, which can improve network performance by reducing, for example, the number of PRACH retransmissions.

[0031] The techniques and apparatus described herein enable network nodes to send PDCCH commands to configure the UE to send PRACH transmissions to candidate cells and output RAR configurations for RAR transmissions on one of the first serving cell, the second serving cell, or the candidate cell. By doing so, the network node can indicate to the UE which cell will respond to the PRACH transmission by sending RARs to the UE, which can lead to improved network performance because it reduces the number of PRACH transmissions from the UE.

[0032] Various aspects of this disclosure are described more fully below with reference to the accompanying drawings. However, this disclosure can be embodied in many different forms and should not be construed as limited to any particular structure or function presented throughout this disclosure. Rather, these aspects are provided so that this disclosure will be comprehensive and complete, and will fully convey the scope of protection of this disclosure to those skilled in the art. Those skilled in the art will appreciate that the scope of this disclosure is intended to cover any aspect of the disclosure herein, whether implemented independently or in combination with any other aspect of this disclosure. For example, any number of aspects set forth herein may be used to implement an apparatus or practice. Furthermore, the scope of this disclosure is intended to cover such apparatuses or methods practiced using structures, functions, or structures and functions other than or different from the various aspects of the disclosure set forth herein. It should be understood that any aspect of the disclosure herein may be embodied by one or more elements of the claims.

[0033] Various devices and techniques will now be used to illustrate several aspects of a telecommunications system. These devices and techniques will be described in detail below and illustrated in the accompanying drawings by various boxes, modules, components, circuits, steps, processes, or algorithms (collectively, “elements”). These elements may be implemented using hardware, software, or a combination thereof. Whether such elements are implemented as hardware or software depends on the specific application and the design constraints imposed on the system as a whole.

[0034] Although terms generally associated with 5G or New Radio (NR) Radio Access Technology (RAT) may be used herein to describe aspects, aspects of this disclosure may be applied to other RATs, such as 3G RAT, 4G RAT and / or 5G and later (e.g., 6G) RATs.

[0035] Figure 1 This is a diagram illustrating an example of a wireless network 100 according to the present disclosure. The wireless network 100 may be a 5G (e.g., NR) network and / or a 4G (e.g., Long Term Evolution (LTE)) network, or may include elements of a 5G (e.g., NR) network and / or elements of a 4G (e.g., LTE) network, etc. The wireless network 100 may include one or more network nodes 110 (shown as network node 110a, network node 110b, network node 110c, and network node 110d), one or more UEs 120 (shown as UE 120a, UE 120b, UE 120c, UE 120d, and UE 120e), and / or other entities. Network node 110 is a network node that communicates with UE 120. As shown, network node 110 may include one or more network nodes. For example, network node 110 can be an aggregated network node, meaning that the aggregated network node is configured to utilize a radio protocol stack that is physically or logically integrated within a single radio access network (RAN) node (e.g., within a single device or unit). As another example, network node 110 can be a decomposed network node (sometimes referred to as a decomposed base station), meaning that network node 110 is configured to utilize a protocol stack that is physically or logically distributed among two or more nodes (such as one or more central units (CUs), one or more distributed units (DUs), or one or more radio units (RUs)).

[0036] In some examples, network node 110 is or includes network nodes (such as RUs) that communicate with UE 120 via a radio access link. In some examples, network node 110 is or includes network nodes (such as DUs) that communicate with other network nodes 110 via a fronthaul or midhaul link. In some examples, network node 110 is or includes network nodes (such as CUs) that communicate with other network nodes 110 via a midhaul link or with the core network via a backhaul link. In some examples, network node 110 (such as aggregated network node 110 or decomposed network node 110) may include multiple network nodes, such as one or more RUs, one or more CUs, and / or one or more DUs. Network node 110 may include, for example, NR base stations, LTE base stations, Node Bs, eNBs (e.g., in 4G), gNBs (e.g., in 5G), access points, Transmit / Receive Points (TRPs), DUs, RUs, CUs, network mobility elements, core network nodes, network elements, network equipment, RAN nodes, or combinations thereof. In some examples, network nodes 110 can interconnect with each other or with one or more other network nodes 110 in the wireless network 100 using any suitable transport network through various types of fronthaul interfaces, midhaul interfaces, and / or backhaul interfaces (such as direct physical connections, air interfaces, or virtual networks).

[0037] In some examples, network node 110 may provide communication coverage for a specific geographic area. In the 3rd Generation Partnership Project (3GPP), depending on the context in which the term is used, the term "cell" may refer to the coverage area of ​​network node 110 and / or the network node subsystem serving that coverage area. Network node 110 may provide communication coverage for macrocells, picocells, femtocells, and / or another type of cell. A macrocell may cover a relatively large geographic area (e.g., with a radius of several kilometers) and may allow unrestricted access by UE 120 with a service subscription. A picocell may cover a relatively small geographic area and may allow unrestricted access by UE 120 with a service subscription. A femtocell may cover a relatively small geographic area (e.g., a home) and may allow restricted access by UE 120 associated with the femtocell (e.g., UE 120 in a Closed Subscriber Group (CSG)). Network node 110 used for macrocells may be referred to as a macro network node. Network node 110 used for picocells may be referred to as a pico network node. The network node 110 used for femtocells can be referred to as a femtocell network node or a home network node. Figure 1In the example shown, network node 110a can be a macro network node for macro cell 102a, network node 110b can be a pico network node for pico cell 102b, and network node 110c can be a femto network node for femto cell 102c. Network nodes can support one or more (e.g., three) cells. In some examples, the cells may not necessarily be stationary, and the geographical area of ​​the cells may move depending on the location of the mobile network node 110 (e.g., a mobile network node).

[0038] In some aspects, the term "base station" or "network node" may refer to an aggregated base station, a decomposed base station, an integrated access and backhaul (IAB) node, a relay node, or one or more components thereof. For example, in some aspects, "base station" or "network node" may refer to a CU, DU, RU, a near real-time (near RT) RAN intelligent controller (RIC), or a non-real-time (non-RT) RIC, or a combination thereof. In some aspects, the term "base station" or "network node" may refer to a device configured to perform one or more functions (such as those described herein in conjunction with network node 110). In some aspects, the term "base station" or "network node" may refer to multiple devices configured to perform one or more functions. For example, in some distributed systems, each of a number of different devices (which may be located in the same geographical location or different geographical locations) may be configured to perform at least a portion of a function, or repeatedly perform at least a portion of that function, and the term "base station" or "network node" may refer to any one or more of these different devices. In some aspects, the term "base station" or "network node" may refer to one or more virtual base stations or one or more virtual base station functions. For example, in some aspects, two or more base station functions can be instantiated on a single device. In some aspects, the term "base station" or "network node" may refer to one base station function rather than another. In this way, a single device can include more than one base station.

[0039] Wireless network 100 may include one or more relay stations. A relay station is a network node that can receive data transmissions from upstream nodes (e.g., network node 110 or UE 120) and transmit data to downstream nodes (e.g., UE 120 or network node 110). A relay station may be a UE 120 that can relay transmissions for other UE 120s. Figure 1 In the example shown, network node 110d (e.g., a relay network node) can communicate with network node 110a (e.g., a macro network node) and UE 120d to facilitate communication between network node 110a and UE 120d. The network node 110 for relay communication may be referred to as a relay station, relay base station, relay network node, relay node, repeater, etc.

[0040] Wireless network 100 can be a heterogeneous network, comprising different types of network nodes 110, such as macro network nodes, pico network nodes, femto network nodes, relay network nodes, etc. These different types of network nodes 110 may have different transmit power levels, different coverage areas, and / or different effects on interference in wireless network 100. For example, macro network nodes may have high transmit power levels (e.g., 5 watts to 40 watts), while pico network nodes, femto network nodes, and relay network nodes may have lower transmit power levels (e.g., 0.1 watts to 2 watts).

[0041] Network controller 130 may be coupled to or communicate with a group of network nodes 110, and may provide coordination and control for these network nodes 110. Network controller 130 may communicate with network nodes 110 via a backhaul or midhaul link. Network nodes 110 may also communicate directly with each other, or indirectly via a wireless or wired backhaul link. In some aspects, network controller 130 may be a CU or a core network device, or may include a CU or a core network device.

[0042] UE 120 may be distributed throughout the wireless network 100, and each UE 120 may be stationary or mobile. UE 120 may include, for example, access terminals, terminals, mobile stations, and / or subscriber units. UE 120 may be a cellular phone (e.g., a smartphone), a personal digital assistant (PDA), a wireless modem, a wireless communication device, a handheld device, a laptop computer, a cordless phone, a wireless local loop (WLL) station, a tablet computer, a camera, a gaming device, a netbook, a smartbook, an ultrabook, a medical device, a biometric device, a wearable device (e.g., a smartwatch, smart clothing, smart glasses, a smart wristband, smart jewelry (e.g., a smart ring or smart bracelet)), an entertainment device (e.g., a music device, a video device, and / or a satellite radio), a vehicle component or sensor, a smart meter / sensor, industrial manufacturing equipment, a GPS device, a UE function of a network node, and / or any other suitable device configured to communicate via wireless or wired media.

[0043] Some UEs 120 may be considered Machine-Type Communication (MTC) or Evolved or Enhanced Machine-Type Communication (eMTC) UEs. MTC UEs and / or eMTC UEs may include, for example, robots, drones, remote devices, sensors, meters, monitors, and / or location tags that can communicate with network nodes, another device (e.g., a remote device), or some other entity. Some UEs 120 may be considered Internet of Things (IoT) devices and / or may be implemented as NB-IoT (Narrowband IoT) devices. Some UEs 120 may be considered customer premises equipment. UEs 120 may be included within a housing that houses the components of the UE 120, such as processor components and / or memory components. In some examples, the processor components and memory components may be coupled together. For example, the processor components (e.g., one or more processors) and memory components (e.g., memory) may be operatively coupled, communicatively coupled, electronically coupled, and / or electrically coupled.

[0044] Generally, any number of wireless networks 100 can be deployed in a given geographical area. Each wireless network 100 can support a specific RAT and can operate on one or more frequencies. A RAT may be referred to as a radio technology, air interface, etc. A frequency may be referred to as a carrier, frequency channel, etc. Each frequency in a given geographical area can support a single RAT to avoid interference between wireless networks using different RATs. In some cases, NR or 5G RAT networks can be deployed.

[0045] In some examples, two or more UEs 120 (e.g., shown as UE 120a and UE 120e) may communicate directly using one or more sidelink channels (e.g., without using network node 110 as an intermediary device to communicate with each other). For example, UE 120 may communicate using peer-to-peer (P2P) communication, device-to-device (D2D) communication, vehicle-to-everything (V2X) protocols (e.g., which may include vehicle-to-vehicle (V2V) protocols, vehicle-to-infrastructure (V2I) protocols, or vehicle-to-pedestrian (V2P) protocols) and / or mesh networks. In such examples, UE 120 may perform scheduling operations, resource selection operations, and / or other operations described elsewhere herein as being performed by network node 110.

[0046] Devices in Wireless Network 100 can communicate using the electromagnetic spectrum, which can be subdivided into various categories, bands, channels, etc., based on frequency or wavelength. For example, devices in Wireless Network 100 can communicate using one or more operating frequency bands. In 5G NR, two initial operating frequency bands have been designated as frequency ranges FR1 (410MHz to 7.125GHz) and FR2 (24.25GHz to 52.6GHz). It should be understood that although a portion of FR1 is greater than 6GHz, FR1 is often (interchangeably) referred to as the “sub-6GHz” band in various documents and articles. Similar naming issues sometimes occur with FR2, which is often (interchangeably) referred to as the “millimeter wave” band in documents and articles, although this is different from the Extremely High Frequency (EHF) band (30GHz–300GHz) designated as a “millimeter wave” band by the International Telecommunication Union (ITU).

[0047] The frequencies between FR1 and FR2 are generally referred to as intermediate frequency (IF) bands. Recent 5G NR studies have designated the operating bands for these IF bands as the frequency range designation FR3 (7.125 GHz – 24.25 GHz). Bands falling within FR3 can inherit FR1 and / or FR2 characteristics, thus effectively extending the features of FR1 and / or FR2 to IF band frequencies. Furthermore, higher frequency bands are currently being explored to extend 5G NR operation beyond 52.6 GHz. For example, three higher operating frequency bands have been designated as the frequency range designations FR4a or FR4-1 (52.6 GHz – 71 GHz), FR4 (52.6 GHz – 114.25 GHz), and FR5 (114.25 GHz – 300 GHz). Each of these higher frequency bands falls within the EHF band.

[0048] Considering the examples above, unless otherwise specifically stated, it should be understood that if the term "below 6 GHz" is used herein, it can broadly refer to frequencies below 6 GHz, within FR1, or including intermediate frequency bands. Furthermore, unless otherwise specifically stated, it should be understood that if the term "millimeter wave" is used herein, it can broadly refer to frequencies that can include intermediate frequency bands, within FR2, FR4, FR4-a, or FR4-1 and / or FR5, or within the EHF band. Modifications to the frequencies included in these operating frequency bands (e.g., FR1, FR2, FR3, FR4, FR4-a, FR4-1, and / or FR5) are contemplated, and the techniques described herein are applicable to those modified frequency ranges.

[0049] In some respects, UE 120 may include a communications manager 140. As described in more detail elsewhere herein, communications manager 140 may receive PDCCH commands from a first serving cell; send PRACH transmissions to a candidate cell; and receive RAR configurations for RAR transmissions on one of the first serving cell, a second serving cell, or a candidate cell. Additionally or alternatively, communications manager 140 may perform one or more other operations described herein.

[0050] In some respects, network node 110 may include communication manager 150. As described in more detail elsewhere herein, communication manager 150 may send PDCCH commands; configure the UE to send PRACH transmissions to candidate cells; and output RAR configurations for RAR transmissions on one of the first serving cell, the second serving cell, or the candidate cell. Additionally or alternatively, communication manager 150 may perform one or more other operations described herein.

[0051] As indicated above, Figure 1 This is provided as an example. Other examples are available with reference to [the relevant information]. Figure 1 The examples described are different.

[0052] Figure 2 This is a diagram illustrating example 200 of communication between network node 110 and UE 120 in a wireless network 100 according to the present disclosure. Network node 110 may be equipped with a set of antennas 234a to 234t, such as T antennas (T≥1). UE 120 may be equipped with a set of antennas 252a to 252r, such as R antennas (R≥1). Network node 110 of example 200 includes one or more radio frequency components, such as antennas 234 and modems 232. In some examples, network node 110 may include an interface, communication components, or another component facilitating communication with UE 120 or another network node. Some network nodes 110 may not include radio frequency components facilitating direct communication with UE 120, such as one or more CUs or one or more DUs.

[0053] At network node 110, transmitting processor 220 can receive data from data source 212 intended for use by UE 120 (or a group of UEs 120). Transmitting processor 220 can select one or more modulation and decoding schemes (MCS) for UE 120, at least in part, based on one or more Channel Quality Indicators (CQIs) received from UE 120. Network node 110 can process (e.g., encode and modulate) the data for UE 120, at least in part, based on the MCS selected for UE 120, and can provide data symbols for UE 120. Transmitting processor 220 can process system information (e.g., for semi-static resource allocation information (SRPI)) and control information (e.g., CQI requests, grants, and / or upper-layer signaling), and provide overhead symbols and control symbols. Transmitting processor 220 can generate reference symbols for reference signals (e.g., cell-specific reference signals (CRS) or demodulation reference signals (DMRS)) and synchronization signals (e.g., primary synchronization signal (PSS) or secondary synchronization signal (SSS)). The transmit (TX) multiple-input multiple-output (MIMO) processor 230 can perform spatial processing (e.g., pre-decoding) on ​​data symbols, control symbols, overhead symbols, and / or reference symbols, where applicable, and can provide a set of output symbol streams (e.g., T output symbol streams) to a set of corresponding modems 232 (e.g., T modems) (shown as modems 232a to 232t). For example, each output symbol stream can be provided to a modulator component (shown as MOD) of modem 232. Each modem 232 can use a corresponding modulator component to process the corresponding output symbol stream (e.g., for OFDM) to obtain an output sample stream. Each modem 232 can also use a corresponding modulator component to process the output sample stream (e.g., convert to analog, amplify, filter, and / or up-convert) to obtain a downlink signal. Modems 232a to 232t can transmit a set of downlink signals (e.g., T downlink signals) via a set of corresponding antennas 234 (e.g., T antennas) (shown as antennas 234a to 234t).

[0054] At UE 120, a set of antennas 252 (shown as antennas 252a to 252r) can receive downlink signals from network node 110 and / or other network nodes 110 and can provide a set of received signals (e.g., R received signals) to a set of modems 254 (e.g., R modems) (shown as modems 254a to 254r). For example, each received signal can be provided to a demodulator component (shown as DEMOD) of modem 254. Each modem 254 can use a corresponding demodulator component to condition (e.g., filter, amplify, downconvert, and / or digitize) the received signal to obtain an input sample. Each modem 254 can use the demodulator component to further process the input sample (e.g., for OFDM) to obtain a received symbol. MIMO detector 256 can obtain the received symbols from modem 254, perform MIMO detection on the received symbols where applicable, and provide the detected symbols. The receiver processor 258 can process (e.g., demodulate and decode) the detected symbols, provide the decoded data for UE 120 to data sink 260, and provide the decoded control information and system information to controller / processor 280. The term "controller / processor" can refer to one or more controllers, one or more processors, or a combination thereof. The channel processor can determine Reference Signal Received Power (RSRP) parameters, Received Signal Strength Indicator (RSSI) parameters, Reference Signal Received Quality (RSRQ) parameters, and / or CQI parameters, etc. In some examples, one or more components of UE 120 may be included in housing 284.

[0055] Network controller 130 may include communication unit 294, controller / processor 290, and memory 292. Network controller 130 may include one or more devices, for example, in a core network. Network controller 130 may communicate with network node 110 via communication unit 294.

[0056] One or more antennas (e.g., antennas 234a to 234t and / or antennas 252a to 252r) may include one or more antenna panels, one or more antenna groups, a set or more sets of antenna elements and / or one or more antenna arrays, etc., or may be included within one or more antenna panels, one or more antenna groups, a set or more sets of antenna elements and / or one or more antenna arrays, etc. Antenna panels, antenna groups, a set of antenna elements and / or antenna arrays may include one or more antenna elements (within a single housing or multiple housings), a set of coplanar antenna elements, a set of non-coplanar antenna elements and / or be coupled to one or more transmitting and / or receiving components (such as...) Figure 2 One or more antenna elements (one or more components in a )

[0057] On the uplink, at UE 120, the transmit processor 264 can receive and process data from data source 262 and control information from controller / processor 280 (e.g., for reporting including RSRP, RSSI, RSRQ, and / or CQI). The transmit processor 264 can generate reference symbols for one or more reference signals. The symbols from the transmit processor 264 can be pre-decoded by the TX MIMO processor 266 where applicable, further processed by the modem 254 (e.g., for DFT-s-OFDM or CP-OFDM), and transmitted to network node 110. In some examples, the modem 254 of UE 120 may include a modulator and demodulator. In some examples, UE 120 includes a transceiver. The transceiver may include any combination of antenna 252, modem 254, MIMO detector 256, receive processor 258, transmit processor 264, and / or TX MIMO processor 266. The transceiver may be used by a processor (e.g., controller / processor 280) and memory 282 to execute this document (e.g., reference). Figures 4 to 10 ( ) any aspect of the method described in the method.

[0058] At network node 110, uplink signals from UE 120 and / or other UEs may be received by antenna 234, processed by modem 232 (e.g., demodulator component of modem 232 (shown as DEMOD)), detected by MIMO detector 236 (where applicable), and further processed by receive processor 238 to obtain decoded data and control information transmitted by UE 120. Receive processor 238 may provide the decoded data to data sink 239 and the decoded control information to controller / processor 240. Network node 110 may include communication unit 244 and may communicate with network controller 130 via communication unit 244. Network node 110 may include scheduler 246 to schedule one or more UEs 120 for downlink and / or uplink communication. In some examples, modem 232 of network node 110 may include modulator and demodulator. In some examples, network node 110 includes transceiver. The transceiver may include any combination of antenna 234, modem 232, MIMO detector 236, receive processor 238, transmit processor 220, and / or TX MIMO processor 230. The transceiver may be used by a processor (e.g., controller / processor 240) and memory 242 to execute this document (e.g., reference). Figures 4 to 10 ( ) any aspect of the method described in the method.

[0059] The controller / processor 240 of network node 110, the controller / processor 280 of UE 120 and / or Figure 2 Any other component may perform one or more technologies associated with the RAR configuration, as described in more detail elsewhere herein. For example, the controller / processor 240 of network node 110, the controller / processor 280 of UE 120, and / or Figure 2 Any other component that can execute or direct, for example Figure 7 The process 700 Figure 8 The operation of process 800 and / or other processes as described herein. Memory 242 and memory 282 may store data and program code for network node 110 and UE 120, respectively. In some examples, memory 242 and / or memory 282 may include a non-transitory computer-readable medium storing one or more instructions (e.g., code and / or program code) for wireless communication. For example, these one or more instructions may cause one or more processors, UE 120 and / or network node 110 to perform or direct, for example, when executed by one or more processors of network node 110 and / or UE 120 (e.g., directly, or after compilation, transformation and / or interpretation). Figure 7 The process 700 Figure 8 The operation of process 800 and / or other processes as described herein. In some examples, the execution instructions may include run instructions, transform instructions, compile instructions and / or interpret instructions, etc.

[0060] In some aspects, UE 120 includes components for receiving PDCCH commands from a first serving cell; components for sending PRACH transmissions to a candidate cell; and / or components for receiving RAR configurations for RAR transmissions on one of the first serving cell, a second serving cell, or a candidate cell. Components enabling UE 120 to perform the operations described herein may include, for example, one or more of the following: a communication manager 140, an antenna 252, a modem 254, a MIMO detector 256, a receive processor 258, a transmit processor 264, a TX MIMO processor 266, a controller / processor 280, or a memory 282.

[0061] In some aspects, network node 110 includes components for transmitting PDCCH commands; components for configuring UE 120 to transmit PRACH transmissions to candidate cells; and / or components for outputting RAR configurations for RAR transmissions on one of the first serving cell, the second serving cell, or the candidate cell. Components enabling network node 110 to perform the operations described herein may include, for example, one or more of the following: communication manager 150, transmit processor 220, TX MIMO processor 230, modem 232, antenna 234, MIMO detector 236, receive processor 238, controller / processor 240, memory 242, or scheduler 246.

[0062] Although Figure 2 The boxes in the diagram are illustrated as different components, but the functions described above with respect to these boxes may be implemented in a single hardware, software, or combined component, or in various combinations of components. For example, the functions described with respect to transmit processor 264, receive processor 258, and / or TX MIMO processor 266 may be performed by or under the control of controller / processor 280.

[0063] As indicated above, Figure 2 This is provided as an example. Other examples are available with reference to [the relevant information]. Figure 2 The examples described are different.

[0064] The deployment of communication systems such as 5G NR systems can be arranged in a variety of ways using various components or parts. In a 5G NR system or network, network nodes, network entities, network mobility elements, RAN nodes, core network nodes, network elements, base stations, or network equipment can be implemented in aggregated or decomposed architectures. For example, base stations (such as Node B (NB), evolved NB (eNB), NR base stations, 5G NB, access points (APs), TRPs, or cells, etc.) or one or more units (or components) performing base station functions can be implemented as aggregated base stations (also known as standalone base stations or monolithic base stations) or decomposed base stations. A "network entity" or "network node" can refer to a decomposed base station or one or more units of a decomposed base station (such as one or more CUs, one or more DUs, one or more RUs, or combinations thereof).

[0065] Aggregated base stations (e.g., aggregated network nodes) can be configured to utilize a radio protocol stack that is physically or logically integrated within a single RAN node (e.g., within a single device or cell). Decomposed base stations (e.g., decomposed network nodes) can be configured to utilize a protocol stack that is physically or logically distributed across two or more cells (such as one or more CUs, one or more DUs, or one or more RUs). In some examples, the CU may be implemented within a network node, and one or more DUs may be co-located with the CU, or alternatively, may be geographically or virtually distributed across one or more other network nodes. DUs may be implemented to communicate with one or more RUs. Each of the CU, DU, and RU may also be implemented as a virtual cell, such as a Virtual Central Unit (VCU), a Virtual Distributed Unit (VDU), or a Virtual Radio Unit (VRU), etc.

[0066] Base station type operation or network design can take into account the aggregation characteristics of base station functionality. For example, decomposed base stations can be utilized in IAB networks, Open Radio Access Networks (O-RAN (such as network configurations initiated by the O-RAN Alliance)), or Virtualized Radio Access Networks (vRAN, also known as Cloud Radio Access Networks (C-RAN)) to facilitate the scaling of communication systems by separating base station functionality into one or more units that can be deployed independently. Decomposed base stations can include functionality implemented by two or more units across various physical locations, as well as functionality virtually implemented for at least one unit, which enables flexibility in network design. The various units of a decomposed base station can be configured for wired or wireless communication with at least one other unit of the decomposed base station.

[0067] Figure 3 This is an illustration of an example disaggregated base station architecture 300 according to this disclosure. The disaggregated base station architecture 300 may include a CU 310, which may communicate directly with the core network 320 via a backhaul link, or indirectly with the core network 320 via one or more disaggregated control units (such as near-RT RIC 325 via an E2 link, or a non-RT RIC 315 associated with a Service Management and Orchestration (SMO) framework 305, or both). The CU 310 may communicate with one or more DUs 330 via a corresponding midhaul link (such as via an F1 interface). Each DU 330 may communicate with one or more RUs 340 via a corresponding fronthaul link. Each RU 340 may communicate with one or more UEs 120 via a corresponding radio frequency (RF) access link. In some implementations, a UE 120 may be served simultaneously by multiple RUs 340.

[0068] Each unit in the clusters (including CU 310, DU 330, RU 340), as well as the near-RT RIC 325, non-RT RIC 315, and SMO frame 305, may include or be coupled to one or more interfaces configured to receive or transmit signals, data, or information (collectively, signals) via wired or wireless transmission media. Each unit in the cluster, or an associated processor or controller providing instructions to one or more communication interfaces of the corresponding unit, may be configured to communicate with one or more units in other clusters via transmission media. In some examples, each unit in the cluster may include a wired interface and a wireless interface configured to receive signals via a wired transmission media or transmit signals to one or more units in other clusters, and the wireless interface may include a receiver, transmitter, or transceiver (such as an RF transceiver) configured to receive signals via a wireless transmission media or transmit signals to one or more units in other clusters, or both.

[0069] In some aspects, the CU 310 can host one or more higher-level control functions. Such control functions may include Radio Resource Control (RRC) functions, Packet Data Convergence Protocol (PDCP) functions, or Service Data Adaptation Protocol (SDAP) functions, etc. Each control function can be implemented using an interface configured to signal to other control functions hosted by the CU 310. The CU 310 can be configured to handle user plane functions (e.g., Central Unit-User Plane (CU-UP) functions), control plane functions (e.g., Central Unit-Control Plane (CU-CP) functions), or combinations thereof. In some implementations, the CU 310 can be logically split into one or more CU-UP units and one or more CU-CP units. When implemented in an O-RAN configuration, the CU-UP units can communicate bidirectionally with the CU-CP units via an interface such as an E1 interface. The CU 310 can be implemented to communicate with the DU 330 for network control and signaling purposes, as needed.

[0070] Each DU 330 may correspond to a logic unit that includes one or more base station functions for controlling the operation of one or more RU 340s. In some aspects, the DU 330 may host one or more of the Radio Link Control (RLC) layer, the Media Access Control (MAC) layer, and one or more high physical (PHY) layers, at least in part, according to functional splits (such as those defined by 3GPP). In some aspects, the one or more high PHY layers may be implemented by one or more modules for forward error correction (FEC) encoding and decoding, scrambling, and modulation and demodulation, etc. In some aspects, the DU 330 may also host one or more low PHY layers, such as those implemented by one or more modules for Fast Fourier Transform (FFT), Inverse FFT (iFFT), Digital Beamforming, or PRACH extraction and filtering, etc. Each layer (which may also be referred to as a module) may be implemented using an interface configured to communicate signals with other layers (and modules) hosted by the DU 330 or with control functions hosted by the CU 310.

[0071] Each RU 340 can implement lower-layer functions. In some deployments, an RU 340 controlled by a DU 330 can correspond to a logical node that hosts RF processing functions or low-PHY layer functions, such as performing FFT, performing iFFT, digital beamforming, or PRACH extraction and filtering, based on function splitting (e.g., function splitting defined by 3GPP) (such as lower-layer function splitting). In such architectures, each RU 340 can be operated to handle over-the-air (OTA) communications with one or more UE 120s. In some specific implementations, the real-time and non-real-time aspects of control plane and user plane communications with the RU 340 can be controlled by the corresponding DU 330. In some scenarios, this configuration allows each DU 330 and CU 310 to be implemented in a cloud-based RAN architecture, such as a vRAN architecture.

[0072] The SMO framework 305 can be configured to support RAN deployment and provisioning of both non-virtualized and virtualized network elements. For non-virtualized network elements, the SMO framework 305 can be configured to support the deployment of dedicated physical resources for RAN coverage requirements, which can be managed via operation and maintenance interfaces such as the O1 interface. For virtualized network elements, the SMO framework 305 can be configured to interact with cloud computing platforms such as the Open Cloud (O-Cloud) platform 390 to perform network element lifecycle management (such as instantiating virtualized network elements) via cloud computing platform interfaces such as the O2 interface. Such virtualized network elements may include, but are not limited to, CU 310, DU 330, RU 340, non-RT RIC 315, and near-RTTRIC 325. In some specific implementations, the SMO framework 305 may communicate with the hardware aspects of the 4G RAN, such as the Open eNB (O-eNB) 311, via the O1 interface. Additionally, in some implementations, the SMO framework 305 can communicate directly with each of one or more RUs 340 via a corresponding O1 interface. The SMO framework 305 may also include a non-RT RIC 315 configured to support the functionality of the SMO framework 305.

[0073] The non-RT RIC 315 can be configured to include logical functions that enable non-real-time control and optimization of RAN elements and resources, including artificial intelligence / machine learning (AI / ML) workflows for model training and updates, or policy-based guidance for applications / features in the near-RT RIC 325. The non-RT RIC 315 can be coupled to or communicate with the near-RT RIC 325, such as via an A1 interface. The near-RT RIC 325 can be configured to include logical functions that enable near real-time control and optimization of RAN elements and resources via an interface, such as an E2 interface, through data collection and actions, connecting one or more CU 310s, one or more DU 330s, or both, and O-eNBs to the near-RT RIC 325.

[0074] In some implementations, to generate AI / ML models to be deployed in the near-RT RIC 325, the non-RT RIC 315 may receive parameters or external enrichment information from an external server. This information can be utilized by the near-RT RIC 325 and can be received from non-network data sources or network functions at the SMO framework 305 or the non-RT RIC 315. In some examples, the non-RT RIC 315 or near-RT RIC 325 may be configured to tune RAN behavior or performance. For example, the non-RT RIC 315 may monitor long-term trends and patterns in performance and employ AI / ML models to perform corrective actions via the SMO framework 305 (such as reconfiguration via the O1 interface) or via the creation of RAN management policies (such as A1 interface policies).

[0075] As indicated above, Figure 3 This is provided as an example. Other examples are available with reference to [the relevant information]. Figure 3 The examples described are different.

[0076] Figure 4 This is a diagram illustrating example 400 of a physical channel and reference signal in a wireless network according to this disclosure. For example... Figure 4 As shown, the downlink channel and downlink reference signal can carry information from network node 110 to UE 120, and the uplink channel and uplink reference signal can carry information from UE 120 to network node 110.

[0077] As shown in the figure, downlink channels may include a PDCCH carrying downlink control information (DCI), a physical downlink shared channel (PDSCH) carrying downlink data, or a physical broadcast channel (PBCH) carrying system information, among other examples. In some aspects, PDSCH communication may be scheduled by PDCCH communication. As further shown, uplink channels may include a physical uplink control channel (PUCCH) carrying uplink control information (UCI), a physical uplink shared channel (PUSCH) carrying uplink data, or a PRACH for initial network access, etc. In some aspects, UE 120 may send acknowledgment (ACK) or negative acknowledgment (NACK) feedback (e.g., ACK / NACK feedback or ACK / NACK information) in the UCI on the PUCCH and / or PUSCH.

[0078] As further illustrated, downlink reference signals may include synchronization signal blocks (SSBs), channel state information (CSI) reference signals (CSI-RS), DMRS, positioning reference signals (PRS), or phase tracking reference signals (PTRS), etc. As also illustrated, uplink reference signals may include sounding reference signals (SRS), DMRS, or PTRS, etc.

[0079] The SSB can carry information for initial network acquisition and synchronization, such as the primary synchronization signal (PSS), secondary synchronization signal (SSS), PBCH, and PBCH DMRS. The SSB is sometimes referred to as a synchronization signal / PBCH (SS / PBCH) block. In some respects, network node 110 can transmit multiple SSBs on multiple corresponding beams, and the SSBs can be used for beam selection.

[0080] The CSI-RS can carry information for downlink channel estimation (e.g., downlink CSI acquisition), which can be used for scheduling, link adaptation, or beam management, etc. Network node 110 can configure a set of CSI-RS for UE 120, and UE 120 can measure this configured set of CSI-RS. Based at least in part on these measurements, UE 120 can perform channel estimation and report channel estimation parameters to network node 110 (e.g., in a CSI report), such as Channel Quality Indicator (CQI), Pre-decoding Matrix Indicator (PMI), CSI-RS Resource Indicator (CRI), Layer Indicator (LI), Rank Indicator (RI), or Reference Signal Received Power (RSRP), etc. Network node 110 can use CSI reports to select transmission parameters for downlink communication to UE 120, such as the number of transmission layers (e.g., rank), pre-decoding matrix (e.g., pre-decoder), modulation and decoding scheme (MCS), or refinement of downlink beams (e.g., using beam refinement or beam management procedures), etc.

[0081] The DMRS can carry information used to estimate the radio channel for demodulating the associated physical channel (e.g., PDCCH, PDSCH, PBCH, PUCCH, or PUSCH). The design and mapping of the DMRS can be specific to the physical channel it is used to estimate. The DMRS is UE-specific, can be beamformed, can be confined to scheduled resources (e.g., not transmitted over broadband), and can be transmitted only when necessary. As shown, the DMRS is used for both downlink and uplink communication.

[0082] PTRS can carry information for compensating oscillator phase noise. Typically, phase noise increases with the oscillator carrier frequency. Therefore, PTRS can be used at high carrier frequencies (such as millimeter-wave frequencies) to mitigate phase noise. PTRS can be used to track the phase of the local oscillator and to achieve suppression of phase noise and common phase error (CPE). As shown, PTRS is used for both downlink communication (e.g., on PDSCH) and uplink communication (e.g., on PUSCH).

[0083] The PRS can carry information for improving the Observed Time Difference of Arrival (OTDOA) positioning performance of the UE 120 by performing timing or ranging measurements based on signals transmitted by network node 110. For example, the PRS can be a pseudo-random quadrature phase shift keying (QPSK) sequence mapped diagonally with frequency and time offsets to avoid conflicts with cell-specific reference signals and control channels (e.g., PDCCH). Generally, the PRS can be designed to improve the detectability of the UE 120, which may need to detect downlink signals from multiple neighboring network nodes to perform OTDOA-based positioning. Therefore, the UE 120 can receive PRS from multiple cells (e.g., a reference cell and one or more neighboring cells) and can report the Reference Signal Time Difference (RSTD) based on the OTDA measurements associated with the PRS received from the multiple cells. In some aspects, network node 110 can then calculate the positioning of the UE 120 based on the RSTD measurements reported by the UE 120.

[0084] The SRS can carry information for uplink channel estimation, which can be used for scheduling, link adaptation, pre-decoder selection, or beam management, etc. Network node 110 can configure one or more SRS resource sets for UE 120, and UE 120 can transmit SRS on the configured SRS resource sets. The SRS resource sets can have configurable uses, such as uplink CSI acquisition, downlink CSI acquisition for reciprocity-based operation, uplink beam management, etc. Network node 110 can measure the SRS, perform channel estimation at least in part based on these measurements, and use the SRS measurements to configure communication with UE 120.

[0085] As indicated above, Figure 4 This is provided as an example. Other examples are available with reference to [the relevant information]. Figure 4 The examples described are different.

[0086] Figure 5 This is an illustration of example 500 of LTM according to this disclosure. LTM allows the UE to maintain communication with the network while moving between network cells, such as between an initial cell 505 and one or more candidate cells 510A-510C. The initial cell 505 may include a network cell with which the UE 120 has already communicated and which has sent PDCCH commands to the UE 120. The candidate cells 510A-510C may include neighboring cells relative to the initial cell 505. In some cases, one or more of the candidate cells 510A-510C may have a stronger signal than the initial cell 505. A change in signal strength between the UE 120 and the initial cell 505 may be a result of the UE moving away from the initial cell 505.

[0087] In LTM, the handover from initial cell 505 to one of candidate cells 510A-510C can be initiated by UE 120 based on measurements performed by UE 120's radio interface (L1) and radio access technology (L2). When UE 120 detects a weak signal on initial cell 505, UE 120 can initiate a handover to a candidate cell with a stronger signal among candidate cells 510A-510C. Initial cell 505 can be referred to as the serving cell, and initial cell 505 and candidate cells 510A-510C can be special cells (SpCells).

[0088] As shown in Example 500, UE 120 is moving toward candidate cell 510A. If measurements indicate that candidate cell 510A has the strongest signal, UE 120 may initiate a handover from initial cell 505 to candidate cell 510A.

[0089] Before handover to candidate cell 510A, initial cell 505 may have already sent a PDCCH command to UE 120. After handover, UE 120 may have already sent a PRACH transmission to candidate cell 510A. Therefore, UE 120 may have sent a PRACH transmission to a cell other than the cell that sent the PDCCH command (i.e., initial cell 505) (i.e., candidate cell 510A), creating ambiguity that the UE does not know whether the RAR will be sent from initial cell 505 or candidate cell 510A. This could cause UE 120 to miss the RAR transmission, for example, if UE 120 seeks the RAR transmission from, for example, initial cell 505. The RAR may include information that UE 120 can use to communicate with candidate cell 510A via PRACH, such as TA identifier, power control indication, and random access preamble identifier, etc. The TA identifier may include a physical identifier or a logical cell identifier. The RAR may include transmission control indication (TCI) state-activated MAC control element (MAC-CE) signaling.

[0090] Some of the techniques and apparatus described herein enable UE 120 to receive PDCCH commands from a first serving cell (such as initial cell 505), send PRACH transmissions to candidate cells (such as candidate cell 510A), and receive RAR configurations for RAR transmissions on the first serving cell, a second serving cell (such as candidate cell 510B or 510C), or one of the candidate cells. Therefore, UE 120 is more likely to receive RAR transmissions, which can improve network performance by reducing, for example, the number of PRACH retransmissions.

[0091] Some of the techniques and apparatus described herein enable network node 110 to send PDCCH commands to configure the UE to send PRACH transmissions to a candidate cell (such as candidate cell 510A) and output RAR configurations for RAR transmissions on a first serving cell (such as initial cell 505), a second serving cell (such as one of candidate cells 510B or 510C), or one of the candidate cells. By doing so, network node 110 can indicate to UE 120 which cell will respond to the PRACH transmissions by sending RARs to UE 120, which can lead to improved network performance because it can reduce the number of PRACH transmissions from UE 120.

[0092] As indicated above, Figure 5 This is provided as an example. Other examples are available relative to... Figure 5 The examples described are different.

[0093] Figure 6 This is a diagram illustrating an example 600 associated with a RAR configuration for LTM according to this disclosure. (See diagram for example.) Figure 6As shown, a UE (such as UE 120) can communicate with an initial cell (such as initial cell 505) and a candidate cell (such as candidate cell 510A). In some cases, the initial cell and the candidate cell are each part of a different network node 110. In some cases, network node 110 may include multiple serving cells (referred to as "first serving cell" and "second serving cell"), and one or more serving cells of network node 110 may act as an initial cell or a candidate cell, etc.

[0094] As shown by reference numeral 605 in the attached figure, the initial cell can send PDCCH commands, and the UE can receive PDCCH commands. The PDCCH commands can contain information for PRACH communication between the UE and the initial cell or candidate cells, such as time and frequency resources.

[0095] As shown by reference numeral 610 in the attached figure, the UE can transmit UE capabilities, and the initial cell, candidate cells, and / or combinations thereof can receive UE capabilities. UE capabilities can indicate whether the UE supports simultaneous operation on the initial cell and candidate cells. In some aspects, UE capabilities can indicate that the UE can only support PRACH transmission in candidate cells with RAR, the UE can only support PRACH transmission in candidate cells without RAR, or the UE can support both PRACH transmission in candidate cells with RAR and PRACH transmission in candidate cells without RAR. In the absence of UE capability indication, the UE can default to supporting a predetermined scheme: only supporting PRACH transmission in candidate cells with RAR, only supporting PRACH transmission in candidate cells without RAR, or supporting both PRACH transmission in candidate cells with RAR and PRACH transmission in candidate cells without RAR.

[0096] As shown by reference numeral 615 in the attached figure, the initial cell can transmit RAR configuration, and the UE can receive RAR configuration. RAR configuration can configure the UE to receive RAR transmissions from the initial cell or a candidate cell. In some aspects, RAR configuration configures the UE to receive RAR transmissions on the initial cell. In some aspects, RAR configuration can include a first time offset for the RAR window. The RAR window can define the time period during which the UE can expect to receive RAR transmissions, the time period during which the candidate cell can transmit RAR transmissions, and / or combinations thereof, etc. The first time offset can define a predetermined number of symbols or time slots, or a predetermined amount of time, of RAR transmission relative to the end of PRACH transmission. In some aspects, RAR configuration can also include a second time offset for the RAR window. The second time offset can define a predetermined number of symbols or time slots, or a predetermined amount of time, of RAR transmission relative to the end of PRACH transmission. In some aspects, RAR configuration configures the UE to receive RAR transmissions on a candidate cell.

[0097] In some aspects, RAR configuration may be based at least in part on whether the UE supports simultaneous operation on the initial cell and candidate cells. For example, if the UE supports simultaneous operation on the initial cell and candidate cells, the RAR configuration may include at least in part an interruption gap caused by misalignment of one or more of the center frequencies of the beam, downlink or uplink channel, or bandwidth portion between the candidate cell and the initial cell. The interruption gap may define the time period between transmissions on the initial cell and the candidate cell. In some aspects, RAR configuration may include at least in part a prioriability indicating that the UE does not support simultaneous operation on the initial cell and candidate cells. Prioritization may be at least in part based on cell type. For example, in some aspects, prioritization may give priority to one cell among the initial cell and candidate cells over the other. In some aspects, prioritization may be at least in part based on communication direction. For example, in some aspects, prioritization may give priority to one direction of downlink or uplink communication over the other. In some aspects, prioritization may be at least in part based on channel type. For example, in some respects, prioritization can make one channel of PRACH, PUCCH, PUSCH, and SRS take precedence over another channel of PRACH, PUCCH, PUSCH, and SRS. In some respects, prioritization can be based at least in part on physical layer values.

[0098] As shown by reference numeral 620 in the attached figure, the UE can switch to communication via candidate cells. In some aspects, the UE can perform an LTM handover procedure to communicate via candidate cells. The LTM handover procedure may include measuring the signals transmitted from multiple candidate cells and switching to the candidate cell with the highest signal strength.

[0099] As shown by reference numeral 625 in the attached figure, the UE can send PRACH transmissions, and the candidate cell can receive PRACH transmissions. PRACH transmissions can be sent from the UE to the candidate cell based on a PDCCH command sent from the initial cell and received at the UE.

[0100] As shown by reference numeral 630 in the attached figure, the initial cell or candidate cell can transmit RAR transmissions, and the UE can receive RAR transmissions. In some aspects, the UE can receive RAR transmissions according to the RAR configuration. For example, in some aspects, the RAR configuration can indicate that the RAR will be transmitted from the first serving cell of the initial cell. In some aspects, the RAR configuration can indicate that the RAR will be transmitted from the second serving cell of the initial cell. In some aspects, the RAR configuration can indicate that the RAR will be transmitted from the candidate cell. In some aspects, for example, when the PDCCH commands used for RPACH and RAR are in the same serving cell, the UE can apply the same beam or TCI of the PDCCH commands to receive the RAR transmissions. In some aspects, for example, when the PDCCH commands used for RPACH and RAR are in different serving cells, the UE can apply the DMRS antenna port quasi-co-address (QCL) attribute of the control resource set (CORESET) associated with the type 1 PDCCH common search space (CSS) set used to receive PDCCH commands to receive the RAR transmissions. In some respects, RAR configuration can configure the UE to receive RAR transmissions on a second serving cell, which may be a different serving cell from the first serving cell and the candidate cell.

[0101] Therefore, using Example 600, the UE can be configured to receive RAR transmissions from the same cell that sent the PDCCH command or from a different cell that may have already received the PRACH transmission. Furthermore, using Example 600, the UE can be configured to receive RAR transmissions from the initial cell or a candidate cell. Therefore, the UE will not spend time or resources searching for RARs from the wrong cell.

[0102] As indicated above, Figure 6 This is provided as an example. Other examples are available relative to... Figure 6 The examples described are different.

[0103] Figure 7 This is a diagram illustrating an example procedure 700 performed by a UE according to this disclosure. Example procedure 700 is an example in which a UE (e.g., UE 120) performs operations associated with RAR configuration.

[0104] like Figure 7 As shown, in some aspects, process 700 may include receiving a PDCCH command from a first serving cell (block 710). For example, the UE (e.g., using...) Figure 9 The receiving component 902 and / or communication manager 906 depicted herein can receive PDCCH commands from the first serving cell, as described above.

[0105] like Figure 7As further shown, in some aspects, process 700 may include sending a PRACH transmission to the candidate cell (box 720). For example, the UE (e.g., using...) Figure 9 The transmitting component 904 and / or the communication manager 906 described above can transmit PRACH messages to candidate cells.

[0106] like Figure 7 Further shown, in some aspects, process 700 may include receiving RAR configuration (block 730) for RAR transmission on one of the first serving cell, the second serving cell, or the candidate cell. For example, the UE (e.g., using...) Figure 9 The receiving component 902 and / or communication manager 906 depicted herein may receive RAR configuration for RAR transmission on one of the first serving cell, the second serving cell, or the candidate cell, as described above.

[0107] Process 700 may include additional aspects, such as any single aspect or any combination of aspects described below and / or in conjunction with one or more other process descriptions elsewhere herein.

[0108] In the first aspect, the RAR configuration is used to receive RAR transmissions on the first serving cell.

[0109] In the second aspect, either alone or in combination with the first aspect, the RAR configuration includes a first time offset for the RAR window.

[0110] In the third aspect, either alone or in combination with one or more of the first and second aspects, the first time offset defines a predetermined number of symbols or time slots, or a predetermined amount of time, from the end of PRACH transmission.

[0111] In the fourth aspect, either alone or in combination with one or more of the first to third aspects, the RAR configuration includes a second time offset for the RAR window.

[0112] In the fifth aspect, either alone or in combination with one or more of the first to fourth aspects, the second time offset defines a predetermined number of symbols or time slots, or a predetermined amount of time, from the end of PRACH transmission.

[0113] In the sixth aspect, either alone or in combination with one or more of the first to fifth aspects, process 700 includes receiving RAR transmissions according to the RAR configuration by applying the same beam or TCI of the PDCCH command to the RAR transmission.

[0114] In the seventh aspect, either alone or in combination with one or more of the first to sixth aspects, process 700 includes receiving RAR transmissions according to the RAR configuration by applying the DMRS antenna port QCL attribute of the CORESET associated with the type 1 PDCCH CSS set used for receiving PDCCH commands to the RAR transmission.

[0115] In the eighth aspect, either alone or in combination with one or more of the first to seventh aspects, the RAR configuration is used to receive RAR transmissions on the second serving cell.

[0116] In the ninth aspect, either alone or in combination with one or more of the first to eighth aspects, process 700 includes receiving RAR transmissions according to the RAR configuration by applying the DMRS antenna port QCL attribute of the CORESET associated with the type 1 PDCCH CSS set used for receiving PDCCH commands to the RAR transmission.

[0117] In the tenth aspect, either alone or in combination with one or more of the first to ninth aspects, the RAR configuration is used to receive RAR transmissions on candidate cells.

[0118] In the eleventh aspect, RAR transmission includes a TA identifier, either alone or in combination with one or more of the first to tenth aspects.

[0119] In the twelfth aspect, either alone or in combination with one or more of the first to eleventh aspects, the TA identifier includes a physical cell identifier or a logical cell identifier.

[0120] In the thirteenth aspect, either alone or in combination with one or more of the first to twelfth aspects, the RAR transmission includes a power control instruction.

[0121] In the fourteenth aspect, alone or in combination with one or more of the first to thirteenth aspects, RAR sends MAC-CE signaling including TCI state activation.

[0122] In the fifteenth aspect, either alone or in combination with one or more of the first to fourteenth aspects, process 700 includes sending an indication to one or more of the first serving cell or candidate cells whether the UE supports the ability to operate simultaneously on the first serving cell and the candidate cells.

[0123] In the sixteenth aspect, either alone or in combination with one or more of the first to fifteenth aspects, the RAR configuration includes at least in part an interruption gap based on indicating that the UE does not support the ability to operate simultaneously on the first serving cell and the candidate cell.

[0124] In the seventeenth aspect, either alone or in combination with one or more of the first to sixteenth aspects, the RAR configuration also includes at least in part a misalignment gap between the candidate cell and the first serving cell based on one or more of the center frequency of the beam, downlink or uplink channel, or a portion of the bandwidth.

[0125] In the eighteenth aspect, either alone or in combination with one or more of the first to seventeenth aspects, the RAR configuration also includes at least in part a priori indication that the UE does not support the ability to operate simultaneously on the first serving cell and the candidate cell.

[0126] In the nineteenth aspect, priority is given, either alone or in combination with one or more of the first to eighteenth aspects, based at least in part on cell type, and one of the first serving cell and candidate cells is given priority over the other of the first serving cell and candidate cells.

[0127] In the twentieth aspect, either alone or in combination with one or more of the first to nineteenth aspects, priority is given at least in part based on the direction of communication, and one direction of downlink or uplink communication takes precedence over another direction of downlink or uplink communication.

[0128] In aspect 21, priority is given, either alone or in combination with one or more of aspects 1 to 20, based at least in part on channel type, and one of PRACH, PUCCH, PUSCH and SRS is given priority over another of PRACH, PUCCH, PUSCH and SRS.

[0129] In aspect twenty-two, either alone or in combination with one or more of aspects one through twenty-one, priority is given at least in part based on physical layer values.

[0130] although Figure 7 An example box of process 700 is shown, but in some respects, process 700 may include... Figure 7 The boxes depicted in the diagram may be fewer, different, or arranged differently than additional boxes, boxes, or boxes in a different manner. Alternatively, two or more boxes in the process 700 may be executed in parallel.

[0131] Figure 8 This is a diagram illustrating an example process 800 performed by a network node, for example, according to this disclosure. Example process 800 is an example in which a network node (e.g., network node 110) performs operations associated with RAR configuration in an LTM.

[0132] like Figure 8As shown, in some aspects, process 800 may include sending a PDCCH command (box 810). For example, a network node (e.g., using...) Figure 10 The transmitting component 1004 and / or the communication manager 1006 depicted above can transmit PDCCH commands as described above.

[0133] like Figure 8 As further shown, in some aspects, process 800 may include configuring the UE to send PRACH transmissions to candidate cells (block 820). For example, a network node (e.g., using...) Figure 10 The communication manager 1006 described above can configure the UE to send PRACH transmissions to candidate cells.

[0134] like Figure 8 Further shown, in some aspects, process 800 may include outputting a RAR configuration (box 830) for RAR transmission on one of the first serving cell, the second serving cell, or the candidate cell. For example, a network node (e.g., using...) Figure 10 The transmitting component 1004 and / or the communication manager 1006 described above can output RAR configurations for RAR transmission on one of the first serving cell, the second serving cell, or the candidate cell.

[0135] Process 800 may include additional aspects, such as any single aspect or any combination of aspects described below and / or in conjunction with one or more other process descriptions elsewhere herein.

[0136] In the first aspect, the RAR configuration is used to send RAR transmissions from the first serving cell.

[0137] In the second aspect, either alone or in combination with the first aspect, the RAR configuration includes a first time offset for the RAR window.

[0138] In the third aspect, either alone or in combination with one or more of the first and second aspects, the first time offset defines a predetermined number of symbols or time slots, or a predetermined amount of time, from the end of PRACH transmission.

[0139] In the fourth aspect, either alone or in combination with one or more of the first to third aspects, the RAR configuration includes a second time offset for the RAR window.

[0140] In the fifth aspect, either alone or in combination with one or more of the first to fourth aspects, the second time offset defines a predetermined number of symbols or time slots, or a predetermined amount of time, from the end of PRACH transmission.

[0141] In the sixth aspect, either alone or in combination with one or more of the first to fifth aspects, process 800 includes configuring the UE to apply the same beam or TCI of the PDCCH command to RAR transmission.

[0142] In the seventh aspect, either alone or in combination with one or more of the first to sixth aspects, process 800 includes configuring the UE to apply the DMRS antenna port QCL attribute of the CORESET associated with the type 1 PDCCH CSS set used for receiving PDCCH commands to RAR transmission.

[0143] In the eighth aspect, either alone or in combination with one or more of the first to seventh aspects, the RAR configuration is used for the UE to receive RAR transmissions on the second serving cell.

[0144] In the ninth aspect, alone or in combination with one or more of the first to eighth aspects, process 800 includes configuring the UE to apply the DMRS antenna port QCL attribute of the CORESET associated with the type 1 PDCCH CSS set used for receiving PDCCH commands to RAR transmission.

[0145] In the tenth aspect, either alone or in combination with one or more of the first to ninth aspects, the RAR configuration is used for the UE to receive RAR transmissions on candidate cells.

[0146] In the eleventh aspect, alone or in combination with one or more of the first to tenth aspects, RAR includes the TA identifier.

[0147] In the twelfth aspect, either alone or in combination with one or more of the first to eleventh aspects, the TA identifier includes a physical cell identifier or a logical cell identifier.

[0148] In the thirteenth aspect, alone or in combination with one or more of the first to twelfth aspects, the RAR includes a power control indication.

[0149] In the fourteenth aspect, alone or in combination with one or more of the first to thirteenth aspects, the RAR includes TCI status indication MAC-CE signaling.

[0150] In the fifteenth aspect, either alone or in combination with one or more of the first to fourteenth aspects, process 800 includes configuring the UE to send an indication to one or more of the first serving cell or candidate cells whether the UE supports the ability to operate simultaneously on the first serving cell and the candidate cells.

[0151] In the sixteenth aspect, either alone or in combination with one or more of the first to fifteenth aspects, the RAR configuration includes at least in part an interruption gap based on indicating that the UE does not support the ability to operate simultaneously on the first serving cell and the candidate cell.

[0152] In the seventeenth aspect, either alone or in combination with one or more of the first to sixteenth aspects, the RAR configuration also includes at least in part a misalignment gap between the candidate cell and the first serving cell based on one or more of the center frequency of the beam, downlink or uplink channel, or a portion of the bandwidth.

[0153] In the eighteenth aspect, either alone or in combination with one or more of the first to seventeenth aspects, the RAR configuration also includes at least in part a priori indication that the UE does not support the ability to operate simultaneously on the first serving cell and the candidate cell.

[0154] In the nineteenth aspect, priority is given, either alone or in combination with one or more of the first to eighteenth aspects, based at least in part on cell type, and one of the first serving cell and candidate cells is given priority over the other of the first serving cell and candidate cells.

[0155] In the twentieth aspect, either alone or in combination with one or more of the first to nineteenth aspects, priority is given at least in part based on the direction of communication, and one direction of downlink or uplink communication takes precedence over another direction of downlink or uplink communication.

[0156] In aspect 21, priority is given, either alone or in combination with one or more of aspects 1 to 20, based at least in part on channel type, and one of PRACH, PUCCH, PUSCH and SRS is given priority over another of PRACH, PUCCH, PUSCH and SRS.

[0157] In aspect twenty-two, either alone or in combination with one or more of aspects one through twenty-one, priority is given at least in part based on physical layer values.

[0158] although Figure 8 An example box of process 800 is shown, but in some respects, process 800 may include... Figure 8 The boxes depicted in the diagram may be fewer, different, or arranged differently than additional boxes. Alternatively, two or more boxes in the process 800 may be executed in parallel.

[0159] Figure 9This is a diagram of an example device 900 for wireless communication according to the present disclosure. Device 900 may be a UE, or a UE may include device 900. In some aspects, device 900 includes a receiving component 902, a transmitting component 904, and / or a communication manager 906, which can communicate with each other (e.g., via one or more buses and / or one or more other components). In some aspects, communication manager 906 is combined with... Figure 1 The communication manager 140 is described. As shown, the device 900 can communicate with another device 908 (such as a UE or a network node (such as a CU, DU, RU or base station)) using the receiving component 902 and the transmitting component 904.

[0160] In some respects, device 900 can be configured to perform the functions described herein. Figures 4 to 6 One or more operations described herein. Additionally or alternatively, apparatus 900 may be configured to perform one or more processes described herein, such as Figure 7 The process is 700. In some respects, Figure 9 The illustrated device 900 and / or one or more components may include a combination Figure 2 One or more components of the UE described. Additionally or alternatively, Figure 9 One or more components shown can be combined Figure 2 Implementation within one or more components described. Additionally or alternatively, one or more of the components in a set may be implemented at least partially as software stored in memory. For example, a component (or a portion of a component) may be implemented as instructions or code stored in a non-transitory computer-readable medium and executable by a controller or processor to perform the function or operation of the component.

[0161] Receiver 902 may receive communications from device 908, such as reference signals, control information, data communications, or combinations thereof. Receiver 902 may provide the received communications to one or more other components of device 900. In some aspects, receiver 902 may perform signal processing on the received communications (such as filtering, amplification, demodulation, analog-to-digital conversion, demultiplexing, deinterleaving, demapping, equalization, interference cancellation, or decoding, etc.) and may provide the processed signals to one or more other components of device 900. In some aspects, receiver 902 may include combinations of... Figure 2 The described UE includes a modem, demodulator, MIMO detector, receiver processor, controller / processor, memory, one or more antennas, or a combination thereof.

[0162] Transmitting component 904 can transmit communications, such as reference signals, control information, data communications, or combinations thereof, to device 908. In some aspects, one or more other components of device 900 can generate communications and provide the generated communications to transmitting component 904 for transmission to device 908. In some aspects, transmitting component 904 can perform signal processing (such as filtering, amplification, modulation, digital-to-analog conversion, multiplexing, interleaving, mapping, or encoding, etc.) on the generated communications and can transmit the processed signals to device 908. In some aspects, transmitting component 904 may include combinations of... Figure 2 The described UE includes a modem, modulator, transmit MIMO processor, transmit processor, controller / processor, memory, one or more antennas, or combinations thereof. In some aspects, the transmit component 904 may be co-located with the receive component 902 in a transceiver.

[0163] The communication manager 906 may support the operation of the receiving component 902 and / or the transmitting component 904. For example, the communication manager 906 may receive information associated with configuring the reception of communications by the receiving component 902 and / or the transmission of communications by the transmitting component 904. Additionally or alternatively, the communication manager 906 may generate control information and / or provide control information to the receiving component 902 and / or the transmitting component 904 to control the reception and / or transmission of communications.

[0164] The receiving component 902 can receive PDCCH commands from the first serving cell. The transmitting component 904 can transmit PRACH commands to a candidate cell. The receiving component 902 can receive RAR configurations for RAR transmissions on one of the first serving cell, the second serving cell, or the candidate cell. The receiving component 902 can receive RAR transmissions according to the RAR configuration by applying the same beam or TCI of the PDCCH command to the RAR transmission. The receiving component 902 can receive RAR transmissions according to the RAR configuration by applying the DMRS antenna port QCL attribute of the CORESET associated with the Type 1 PDCCH CSS set used for receiving PDCCH commands to the RAR transmission. The receiving component 902 can receive RAR transmissions according to the RAR configuration by applying the DMRS antenna port QCL attribute of the CORESET associated with the Type 1 PDCCH CSS set used for receiving PDCCH commands to the RAR transmission.

[0165] The transmitting component 904 can send an indication to one or more of the first serving cell or candidate cells whether the UE supports the ability to operate simultaneously on the first serving cell and the candidate cells.

[0166] Figure 9 The number and arrangement of components shown are provided as an example. In reality, they can exist in... Figure 9The components shown are compared to additional components, fewer components, different components, or components arranged in a different manner. Furthermore, Figure 9 The two or more components shown can be implemented within a single component, or Figure 9 The single component shown can be implemented as multiple distributed components. Additionally or alternatively, Figure 9 The set (one or more) components shown can perform actions described by Figure 9 The other set of components shown performs one or more functions.

[0167] Figure 10 This is a diagram of an example device 1000 for wireless communication according to the present disclosure. Device 1000 may be a network node, or a network node may include device 1000. In some aspects, device 1000 includes a receiving component 1002, a transmitting component 1004, and / or a communication manager 1006, which can communicate with each other (e.g., via one or more buses and / or one or more other components). In some aspects, communication manager 1006 is combined with... Figure 1 The communication manager 150 is described. As shown, the device 1000 can communicate with another device 1008 (such as a UE or a network node (such as a CU, DU, RU or base station)) using the receiving component 1002 and the transmitting component 1004.

[0168] In some respects, device 1000 can be configured to perform the functions described herein. Figures 4 to 6 One or more operations described herein. Additionally or alternatively, the apparatus 1000 may be configured to perform one or more processes described herein, such as Figure 8 The process is 800. In some respects, Figure 10 The illustrated device 1000 and / or one or more components may include a combination Figure 2 One or more components of the described network node. Additionally or alternatively, Figure 10 One or more components shown can be combined Figure 2 Implementation within one or more components described. Additionally or alternatively, one or more of the components in a set may be implemented at least partially as software stored in memory. For example, a component (or a portion of a component) may be implemented as instructions or code stored in a non-transitory computer-readable medium and executable by a controller or processor to perform the function or operation of the component.

[0169] Receiver 1002 may receive communications from device 1008, such as reference signals, control information, data communications, or combinations thereof. Receiver 1002 may provide the received communications to one or more other components of device 1000. In some aspects, receiver 1002 may perform signal processing (such as filtering, amplification, demodulation, analog-to-digital conversion, demultiplexing, deinterleaving, demapping, equalization, interference cancellation, or decoding, etc.) on the received communications and may provide the processed signals to one or more other components of device 1000. In some aspects, receiver 1002 may include combinations of... Figure 2 The described network node includes a modem, demodulator, MIMO detector, receiver processor, controller / processor, memory, one or more antennas, or combinations thereof. In some aspects, receiver component 1002 and / or transmitter component 1004 may include or be included in a network interface. The network interface may be configured to acquire and / or output signals for device 1000 via one or more communication links, such as backhaul links, midhaul links, and / or fronthaul links.

[0170] Transmitting component 1004 may transmit communications, such as reference signals, control information, data communications, or combinations thereof, to device 1008. In some aspects, one or more other components of device 1000 may generate communications and provide the generated communications to transmitting component 1004 for transmission to device 1008. In some aspects, transmitting component 1004 may perform signal processing (such as filtering, amplification, modulation, digital-to-analog conversion, multiplexing, interleaving, mapping, or encoding, etc.) on the generated communications and may transmit the processed signals to device 1008. In some aspects, transmitting component 1004 may include combinations of... Figure 2 The described network node includes a modem, modulator, transmit MIMO processor, transmit processor, controller / processor, memory, one or more antennas, or combinations thereof. In some aspects, the transmit component 1004 may be co-located with the receive component 1002 in a transceiver.

[0171] The communication manager 1006 may support the operation of the receiving component 1002 and / or the transmitting component 1004. For example, the communication manager 1006 may receive information associated with configuring the reception of communications by the receiving component 1002 and / or the transmission of communications by the transmitting component 1004. Additionally or alternatively, the communication manager 1006 may generate control information and / or provide control information to the receiving component 1002 and / or the transmitting component 1004 to control the reception and / or transmission of communications.

[0172] Transmitting component 1004 can transmit PDCCH commands. Communication manager 1006 can configure the UE to transmit PRACH to candidate cells. Transmitting component 1004 can output RAR configuration for RAR transmission on one of the first serving cell, the second serving cell, or the candidate cell.

[0173] The Communication Manager 1006 can configure the UE to apply the same beam or TCI of the PDCCH command to RAR transmission. The Communication Manager 1006 can configure the UE to apply the DMRS antenna port QCL attribute of the CORESET associated with the Type 1 PDCCH CSS set used for receiving PDCCH commands to RAR transmission. The Communication Manager 1006 can configure the UE to apply the DMRS antenna port QCL attribute of the CORESET associated with the Type 1 PDCCH CSS set used for receiving PDCCH commands to RAR transmission. The Communication Manager 1006 can configure the UE to send an indication to one or more of the first serving cell or candidate cells whether the UE supports the ability to operate simultaneously on the first serving cell and candidate cells.

[0174] Figure 10 The number and arrangement of components shown are provided as an example. In reality, they can exist in... Figure 10 The components shown are compared to additional components, fewer components, different components, or components arranged in a different manner. Furthermore, Figure 10 The two or more components shown can be implemented within a single component, or Figure 10 The single component shown can be implemented as multiple distributed components. Additionally or alternatively, Figure 10 The set (one or more) components shown can perform actions described by Figure 10 The other set of components shown performs one or more functions.

[0175] The following provides an overview of some aspects of this disclosure:

[0176] Aspect 1: A method for wireless communication performed by a UE, the method comprising: receiving a PDCCH command from a first serving cell; sending a PRACH transmission to a candidate cell; and receiving a RAR configuration for RAR transmission on one of the first serving cell, a second serving cell, or the candidate cell.

[0177] Aspect 2: According to the method of aspect 1, wherein the RAR configuration is used to receive the RAR transmission on the first serving cell.

[0178] Aspect 3: According to the method of aspect 2, the RAR configuration includes a first time offset for the RAR window.

[0179] Aspect 4: According to the method of aspect 3, wherein the first time offset defines a predetermined number of symbols or time slots, or a predetermined amount of time, from the end of the PRACH transmission.

[0180] Aspect 5: According to the method of aspect 3, wherein the RAR configuration includes a second time offset for the RAR window.

[0181] Aspect 6: According to the method of aspect 5, wherein the second time offset defines a predetermined number of symbols or time slots, or a predetermined amount of time, from the end of the PRACH transmission.

[0182] Aspect 7: The method according to aspect 2 further includes receiving the RAR transmission according to the RAR configuration by applying the same beam or TCI of the PDCCH command to the RAR transmission.

[0183] Aspect 8: The method according to aspect 2 further includes receiving the RAR transmission according to the RAR configuration by applying the DMRS antenna port QCL attribute of the CORESET associated with the type 1 PDCCH CSS set for receiving the PDCCH command to the RAR transmission.

[0184] Aspect 9: The method according to any one of Aspects 1 to 8, wherein the RAR configuration is used to receive the RAR transmission on the second serving cell.

[0185] Aspect 10: The method according to aspect 9 further includes receiving the RAR transmission according to the RAR configuration by applying the DMRS antenna port QCL attribute of the CORESET associated with the type 1 PDCCH CSS set for receiving the PDCCH command to the RAR transmission.

[0186] Aspect 11: The method according to any one of Aspects 1 to 10, wherein the RAR configuration is used to receive the RAR transmission on the candidate cell.

[0187] Aspect 12: The method according to aspect 11, wherein the RAR transmission includes a TA identifier.

[0188] Aspect 13: According to the method of aspect 12, the TA identifier includes a physical cell identifier or a logical cell identifier.

[0189] Aspect 14: The method according to aspect 11, wherein the RAR transmission includes a power control indication.

[0190] Aspect 15: The method according to aspect 11, wherein the RAR transmits signaling including TCI state-activated media access control (MAC) control element (MAC-CE).

[0191] Aspect 16: The method according to aspect 11 further includes sending an indication to one or more of the first serving cell or the candidate cells whether the UE supports the ability to operate simultaneously on the first serving cell and the candidate cells.

[0192] Aspect 17: The method according to aspect 16, wherein the RAR configuration includes at least in part an interruption gap indicating that the UE does not support the capability of simultaneous operation on the first serving cell and the candidate cell.

[0193] Aspect 18: According to the method of aspect 17, the RAR configuration further includes, at least in part, the interruption gap between the candidate cell and the first serving cell based on one or more of the center frequency of the beam, downlink or uplink channel, or a portion of the bandwidth.

[0194] Aspect 19: The method according to aspect 16, wherein the RAR configuration further includes at least in part a priori priority based on indicating that the UE does not support simultaneous operation on the first serving cell and the candidate cell.

[0195] Aspect 20: The method according to aspect 19, wherein the prioritization is based at least in part on cell type, and one of the first serving cell and the candidate cells is given priority over the other of the first serving cell and the candidate cells.

[0196] Aspect 21: The method according to aspect 19, wherein the prioritization is at least partially based on the communication direction and prioritizes one communication direction of downlink or uplink communication over another communication direction of downlink or uplink communication.

[0197] Aspect 22: The method according to aspect 19, wherein the prioritization is based at least in part on the channel type and one of the PRACH, Physical Uplink Control Channel (PUCCH), Physical Uplink Shared Channel (PUSCH), and Sound Reference Signal (SRS) is given priority over another of the PRACH, the PUCCH, the PUSCH, and the SRS.

[0198] Aspect 23: The method according to aspect 19, wherein the prioritization is based at least in part on physical layer values.

[0199] Aspect 24: A method for wireless communication performed by a network node, the method comprising: sending a PDCCH command; configuring a UE to send PRACH transmissions to a candidate cell; and outputting a RAR configuration for RAR transmissions on one of a first serving cell, a second serving cell, or the candidate cell.

[0200] Aspect 25: The method according to aspect 24, wherein the RAR configuration is used to send the RAR transmission from the first serving cell.

[0201] Aspect 26: According to the method of aspect 25, the RAR configuration includes a first time offset for the RAR window.

[0202] Aspect 27: According to the method of aspect 26, wherein the first time offset defines a predetermined number of symbols or time slots, or a predetermined amount of time, from the end of the PRACH transmission.

[0203] Aspect 28: According to the method of aspect 26, the RAR configuration includes a second time offset for the RAR window.

[0204] Aspect 29: According to the method of aspect 28, wherein the second time offset defines a predetermined number of symbols or time slots, or a predetermined amount of time, from the end of the PRACH transmission.

[0205] Aspect 30: The method according to aspect 25 further includes configuring the UE to apply the same beam or TCI of the PDCCH command to the RAR transmission.

[0206] Aspect 31: The method according to aspect 25 further includes configuring the UE to apply the DMRS antenna port QCL attribute of the CORESET associated with the type 1 PDCCH CSS set for receiving the PDCCH command to the RAR transmission.

[0207] Aspect 32: The method according to any one of Aspects 24 to 31, wherein the RAR configuration is used for the UE to receive the RAR transmission on the second serving cell.

[0208] Aspect 33: The method according to aspect 32 further includes configuring the UE to apply the DMRS antenna port QCL attribute of the CORESET associated with the type 1 PDCCH CSS set for receiving the PDCCH command to the RAR transmission.

[0209] Aspect 34: The method according to any one of Aspects 24 to 33, wherein the RAR configuration is used for the UE to receive the RAR transmission on the candidate cell.

[0210] Aspect 35: The method according to aspect 34, wherein the RAR includes a TA identifier.

[0211] Aspect 36: According to the method of aspect 35, the TA identifier includes a physical cell identifier or a logical cell identifier.

[0212] Aspect 37: The method according to aspect 34, wherein the RAR includes a power control indication.

[0213] Aspect 38: The method according to aspect 34, wherein the RAR includes TCI status indication media access control (MAC) control element (MAC-CE) signaling.

[0214] Aspect 39: The method according to aspect 34 further includes configuring the UE to send an indication to one or more of the first serving cell or the candidate cells whether the UE supports the ability to operate simultaneously on the first serving cell and the candidate cells.

[0215] Aspect 40: The method according to aspect 39, wherein the RAR configuration includes at least in part an interruption gap indicating that the UE does not support the capability of simultaneous operation on the first serving cell and the candidate cell.

[0216] Aspect 41: According to the method of aspect 40, the RAR configuration further includes, at least in part, the interruption gap caused by the misalignment between the candidate cell and the first serving cell, based on one or more of the center frequency of the beam, downlink or uplink channel, or a portion of the bandwidth.

[0217] Aspect 42: The method according to aspect 39, wherein the RAR configuration further includes at least in part a priori priority based on indicating that the UE does not support simultaneous operation on the first serving cell and the candidate cell.

[0218] Aspect 43: The method according to aspect 42, wherein the prioritization is based at least in part on cell type, and one of the first serving cell and the candidate cells is given priority over the other of the first serving cell and the candidate cells.

[0219] Aspect 44: The method according to aspect 42, wherein the prioritization is at least partially based on the communication direction and prioritizes one communication direction of downlink or uplink communication over another communication direction of downlink or uplink communication.

[0220] Aspect 45: The method according to aspect 42, wherein the prioritization is based at least in part on the channel type, and one of the PRACH, Physical Uplink Control Channel (PUCCH), Physical Uplink Shared Channel (PUSCH), and Sound Reference Signal (SRS) is given priority over another of the PRACH, the PUCCH, the PUSCH, and the SRS.

[0221] Aspect 46: The method according to aspect 42, wherein the prioritization is based at least in part on physical layer values.

[0222] Aspect 47: An apparatus for wireless communication at a device, the apparatus comprising: a processor; a memory coupled to the processor; and instructions stored in the memory and executable by the processor to cause the apparatus to perform the method according to one or more of aspects 1 to 46.

[0223] Aspect 48: An apparatus for wireless communication, the apparatus comprising a memory and one or more processors coupled to the memory, the one or more processors being configured to perform the method according to one or more of aspects 1 to 46.

[0224] Aspect 49: An apparatus for wireless communication, the apparatus comprising at least one component for performing the method according to one or more of aspects 1 to 46.

[0225] Aspect 50: A non-transitory computer-readable medium storing code for wireless communication, said code including instructions executable by a processor to perform the methods described in one or more of aspects 1 to 46.

[0226] Aspect 51: A non-transitory computer-readable medium storing a set of instructions for wireless communication, the set of instructions comprising one or more instructions that, when executed by one or more processors of a device, cause the device to perform the method according to one or more of aspects 1 to 46.

[0227] While the foregoing disclosure provides examples and descriptions, it is not intended to be exhaustive or to limit the aspects to the precise form disclosed. Modifications and variations may be made based on the foregoing disclosure, or from practice in these areas.

[0228] As used herein, the term "component" is intended to be interpreted broadly as hardware and / or a combination of hardware and software. Whether referred to as software, firmware, middleware, microcode, hardware description language, or other names, "software" should be interpreted broadly as meaning instructions, instruction sets, code, code segments, program code, programs, subroutines, software modules, applications, software applications, software packages, routines, subroutines, objects, executable files, threads of execution, procedures, and / or functions, etc. As used herein, a "processor" is implemented in hardware and / or a combination of hardware and software. It will be apparent to those skilled in the art that the systems and / or methods described herein can be implemented in various forms of hardware and / or combinations of hardware and software. The actual dedicated control hardware or software code used to implement these systems and / or methods is not limiting in any way. Therefore, no specific software code is referred to in this document to describe the operation and behavior of the systems and / or methods, as those skilled in the art will understand that the software and hardware can be designed, at least in part, based on the descriptions herein, to implement the systems and / or methods.

[0229] As used in this article, depending on the context, "meeting the threshold" can refer to a value greater than the threshold, greater than or equal to the threshold, less than the threshold, less than or equal to the threshold, equal to the threshold, or not equal to the threshold.

[0230] Although specific combinations of features are set forth in the claims and / or disclosed in the specification, these combinations are not intended to limit the disclosure of various aspects. Many of these features may be combined in ways not specifically set forth in the claims and / or disclosed in the specification. The disclosure of various aspects includes each dependent claim in combination with each other claim in the claim set. As used herein, the phrase “at least one of” in the list of items refers to any combination of these items (including a single member). As an example, “at least one of a, b, or c” is intended to cover a, b, c, a+b, a+c, b+c, and a+b+c, as well as any combination with multiple identical elements (e.g., a+a, a+a+a, a+a+b, a+a+c, a+b+b, a+c+c, b+b, b+b+b, b+b+c, c+c, and c+c+c, or any other ordering of a, b, and c).

[0231] No element, action, or instruction used herein should be construed as critical or necessary unless explicitly stated otherwise. Furthermore, as used herein, the articles “a” and “one” are intended to include one or more items and are interchangeable with “one or more.” Furthermore, as used herein, the article “described” is intended to include one or more items mentioned in connection with the article “described” and is interchangeable with “one or more.” Furthermore, as used herein, the terms “group” and “cluster” are intended to include one or more items and are interchangeable with “one or more.” If only one item is desired, the phrase “only one” or similar terminology is used. Furthermore, as used herein, the terms “have,” “possess,” “have,” etc., are intended to be open-ended terms that do not limit the elements they modify (e.g., an element “having” A may also have B). Furthermore, the phrase “based on” is intended to mean “at least partially based on” unless otherwise explicitly stated. Furthermore, as used herein, the term “or” is intended to be open-ended when used in a series and is interchangeable with “and / or” unless otherwise explicitly stated (e.g., if used in conjunction with “any” or “only one”).

Claims

1. A user equipment (UE) for wireless communication, the user equipment (UE) comprising: Memory; as well as One or more processors coupled to the memory, the one or more processors being configured to: Receive physical downlink control channel (PDCCH) commands from the first serving cell; Send Physical Random Access Channel (PRACH) transmissions to candidate cells; as well as Receive RAR configuration for random access response (RAR) sent on one of the first serving cell, the second serving cell, or the candidate cell.

2. The UE according to claim 1, wherein the RAR configuration is used to receive the RAR transmission on the first serving cell.

3. The UE of claim 2, wherein the RAR configuration includes a first time offset for the RAR window.

4. The UE of claim 3, wherein the first time offset defines a predetermined number of symbols or time slots, or a predetermined amount of time, from the end of the PRACH transmission.

5. The UE of claim 3, wherein the RAR configuration includes a second time offset for the RAR window.

6. The UE of claim 5, wherein the second time offset defines a predetermined number of symbols or time slots, or a predetermined amount of time, from the end of the PRACH transmission.

7. The UE of claim 2, wherein the one or more processors are further configured to receive the RAR transmission according to the RAR configuration by applying the same beam or transmit control indication of the PDCCH command to the RAR transmission.

8. The UE of claim 2, wherein the one or more processors are further configured to receive the RAR transmission according to the RAR configuration by applying a demodulation reference signal antenna port quasi-co-address attribute of a control resource set associated with a type 1 PDCCH common search space set for receiving the PDCCH command to the RAR transmission.

9. The UE according to claim 1, wherein the RAR configuration is used to receive the RAR transmission on the second serving cell.

10. The UE of claim 9, wherein the one or more processors are further configured to receive the RAR transmission according to the RAR configuration by applying a demodulation reference signal antenna port quasi-co-address attribute of a control resource set associated with a type 1 PDCCH common search space set for receiving the PDCCH command to the RAR transmission.

11. The UE according to claim 1, wherein the RAR configuration is used to receive the RAR transmission on the candidate cell.

12. The UE of claim 11, wherein the RAR transmission includes a timing advance identifier.

13. The UE according to claim 12, wherein the timing advance identifier includes a physical cell identifier or a logical cell identifier.

14. The UE of claim 11, wherein the RAR transmission includes a power control indication.

15. The UE of claim 11, wherein the RAR transmission includes transmitting a control indication state-activated media access control (MAC) control element (MAC-CE) signaling.

16. The UE of claim 11, wherein the one or more processors are further configured to send an indication to one or more of the first serving cell or the candidate cells whether the UE supports the ability to operate simultaneously on the first serving cell and the candidate cells.

17. The UE of claim 16, wherein the RAR configuration includes, at least in part, an interruption gap indicating that the UE does not support the capability of simultaneous operation on the first serving cell and the candidate cell.

18. The UE of claim 17, wherein the RAR configuration further includes, at least in part, the interruption gap based on one or more of the center frequency of a beam, a downlink or uplink channel, or a portion of the bandwidth, when the candidate cell and the first serving cell are misaligned.

19. The UE of claim 16, wherein the RAR configuration further includes at least in part a priori priority based on indicating that the UE does not support simultaneous operation on the first serving cell and the candidate cell.

20. The UE of claim 19, wherein the prioritization is at least partially based on cell type and prioritizes one of the first serving cell and the candidate cells over the other of the first serving cell and the candidate cells.

21. The UE of claim 19, wherein the prioritization is at least partially based on communication direction and prioritizes one communication direction of downlink or uplink communication over another communication direction of downlink or uplink communication.

22. The UE of claim 19, wherein the prioritization is based at least in part on channel type and prioritizes one of the PRACH, Physical Uplink Control Channel (PUCCH), Physical Uplink Shared Channel (PUSCH), and Sounding Reference Signal (SRS) over another of the PRACH, PUCCH, PUSCH, and SRS.

23. The UE of claim 19, wherein the prioritization is at least partially based on physical layer values.

24. A network node for wireless communication, the network node comprising: Memory; as well as One or more processors coupled to the memory, the one or more processors being configured to: Send the Physical Downlink Control Channel (PDCCH) command; Configure the user equipment (UE) to send physical random access channel (PRACH) transmissions to candidate cells; as well as Outputs the RAR configuration for sending a random access response (RAR) on one of the first serving cell, the second serving cell, or the candidate cell.

25. The network node of claim 24, wherein the RAR configuration is used to send the RAR transmission from the first serving cell, and wherein the RAR configuration includes a first time offset for the RAR window, the first time offset defining a predetermined number of symbols or time slots, or a predetermined amount of time, from the end of the PRACH transmission.

26. The network node of claim 25, wherein the RAR configuration includes a second time offset for the RAR window, the second time offset defining a predetermined number of symbols or time slots, or a predetermined amount of time, from the end of the PRACH transmission.

27. The network node of claim 24, wherein the RAR configuration is for the UE to receive the RAR transmission on the second serving cell, wherein the one or more processors are further configured to configure the UE to apply a demodulation reference signal antenna port quasi-co-address attribute of a control resource set associated with a type 1 PDCCH common search space set for receiving the PDCCH command to the RAR transmission.

28. The network node of claim 24, wherein the RAR configuration is for the UE to receive the RAR transmission on the candidate cell, wherein the one or more processors are further configured to configure the UE to send an indication to one or more of the first serving cell or the candidate cell whether the UE supports the ability to operate simultaneously on the first serving cell and the candidate cell.

29. A method for wireless communication performed by a user equipment (UE), the method comprising: Receive physical downlink control channel (PDCCH) commands from the first serving cell; Send Physical Random Access Channel (PRACH) transmissions to candidate cells; as well as Receive RAR configuration for random access response (RAR) sent on one of the first serving cell, the second serving cell, or the candidate cell.

30. A method for wireless communication performed by a network node, the method comprising: Send the Physical Downlink Control Channel (PDCCH) command; Configure the user equipment (UE) to send physical random access channel (PRACH) transmissions to candidate cells; as well as Outputs the RAR configuration for sending a random access response (RAR) on one of the first serving cell, the second serving cell, or the candidate cell.

Images