Random access channel triggered bandwidth part switching
By enabling RACH triggered autonomous bandwidth part switching, RedCap UEs can access RACH occasions, overcoming the challenge of initiating PRACH procedures in wireless communication systems, thus reducing delays and signaling overhead.
Patent Information
- Application Number
- PCT/CN2023/113966
- Authority / Receiving Office
- WO · WO
- Patent Type
- Applications
- Current Assignee / Owner
- Filing Date
- 2023-08-21
- Publication Date
- 2025-02-27
AI Technical Summary
In wireless communication systems, RedCap UEs face challenges when attempting to initiate a PRACH procedure due to the lack of physical RACH occasions in their configured bandwidth parts, leading to potential radio link failures and increased signaling overhead.
The method involves enabling RACH triggered autonomous bandwidth part switching, allowing the UE to transition from a non-initial bandwidth part without RACH occasions to another non-initial or initial bandwidth part that includes RACH occasions, thereby ensuring access to necessary resources for the PRACH procedure.
This approach enables RedCap UEs to successfully initiate and complete PRACH procedures without triggering acquisition and cell selection processes, thereby reducing communication delays and signaling overhead.
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Figure CN2023113966_27022025_PF_FP_ABST
Abstract
Description
RANDOM ACCESS CHANNEL TRIGGERED BANDWIDTH PART SWITCHING
[0001] FIELD OF THE DISCLOSURE
[0002] Aspects of the present disclosure generally relate to wireless communication and to techniques and apparatuses for random access channel (RACH) triggered bandwidth part (BWP) switching.BACKGROUND
[0003] Wireless communication systems are widely deployed to provide various telecommunication services such as telephony, video, data, messaging, and broadcasts. Typical wireless communication systems may employ multiple-access technologies capable of supporting communication with multiple users by sharing available system resources (e.g., bandwidth, transmit power, or the like) . 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 promulgated by the Third Generation Partnership Project (3GPP) .
[0004] A wireless network may include one or more network nodes that support communication for wireless communication devices, such as a user equipment (UE) or multiple UEs. A UE may communicate with a network node via downlink communications and uplink communications. “Downlink” (or “DL” ) refers to a communication link from the network node to the UE, and “uplink” (or “UL” ) refers to a communication link from the UE to the network node. Some wireless networks may support device-to-device communication, such as via a local link (e.g., a sidelink (SL) , a wireless local area network (WLAN) link, and / or a wireless personal area network (WPAN) link, among other examples) .
[0005] The above multiple access technologies have been adopted in various telecommunication standards to provide a common protocol that enables different UEs to communicate on a municipal, national, regional, and / or global level. New Radio (NR) , which may be referred to as 5G, is a set of enhancements to the LTE mobile standard promulgated by the 3GPP. NR is designed to better support mobile broadband internet access by improving spectral efficiency, lowering costs, improving services, making use of new spectrum, and better integrating with other open standards using orthogonal frequency division multiplexing (OFDM) with a cyclic prefix (CP) (CP-OFDM) on the downlink, using CP-OFDM and / or single-carrier frequency division multiplexing (SC-FDM) (also known as discrete Fourier transform spread OFDM (DFT-s-OFDM) ) on the uplink, as well as supporting beamforming, multiple-input multiple-output (MIMO) antenna technology, and carrier aggregation. As the demand for mobile broadband access continues to increase, further improvements in LTE, NR, and other radio access technologies remain useful.SUMMARY
[0006] In some aspects, a method of wireless communication performed by a user equipment (UE) includes communicating, with a network node, in a first bandwidth part, wherein the first bandwidth part is a non-initial bandwidth part configured without a first physical random access channel (RACH) occasion; transitioning, from the first bandwidth part to a second bandwidth part, to access a second physical RACH occasion of the second bandwidth part, wherein the second bandwidth part is another non-initial bandwidth part; and transmitting a RACH communication in the second bandwidth part using the second physical RACH occasion of the second bandwidth part.
[0007] In some aspects, a method of wireless communication performed by a UE includes communicating, with a network node, in a first bandwidth part, wherein the first bandwidth part is a non-initial bandwidth part configured without a first physical RACH occasion; transitioning, from the first bandwidth part to a second bandwidth part, to access a second physical RACH occasion of the second bandwidth part, wherein the second bandwidth part is outside a channel bandwidth of the UE in the first bandwidth part, and wherein the second bandwidth part is an initial bandwidth part; and transmitting a RACH communication in the second bandwidth part using the second physical RACH occasion of the second bandwidth part.
[0008] In some aspects, a method of wireless communication performed by a network node includes communicating, with a UE, in a first bandwidth part, wherein the first bandwidth part is a non-initial bandwidth part configured without a first physical RACH occasion; and receiving a RACH communication in a second bandwidth part using a second physical RACH occasion of a second bandwidth part, wherein the second bandwidth part is another non-initial bandwidth part.
[0009] In some aspects, a method of wireless communication performed by a network node includes communicating, with a UE, in a first bandwidth part, wherein the first bandwidth part is a non-initial bandwidth part configured without a first physical RACH occasion; and receiving a RACH communication in a second bandwidth part using a second physical RACH occasion of the second bandwidth part, wherein the second bandwidth part is outside a channel bandwidth of the UE in the first bandwidth part, and wherein the second bandwidth part is an initial bandwidth part.
[0010] In some aspects, a UE for wireless communication includes one or more memories; and one or more processors, coupled to the one or more memories, the one or more processors individually or collectively configured to: communicate, with a network node, in a first bandwidth part, wherein the first bandwidth part is a non-initial bandwidth part configured without a first physical RACH occasion; transition, from the first bandwidth part to a second bandwidth part, to access a second physical RACH occasion of the second bandwidth part, wherein the second bandwidth part is another non-initial bandwidth part; and transmit a RACH communication in the second bandwidth part using the second physical RACH occasion of the second bandwidth part.
[0011] In some aspects, a UE for wireless communication includes one or more memories; and one or more processors, coupled to the one or more memories, the one or more processors individually or collectively configured to: communicate, with a network node, in a first bandwidth part, wherein the first bandwidth part is a non-initial bandwidth part configured without a first physical RACH occasion; transition, from the first bandwidth part to a second bandwidth part, to access a second physical RACH occasion of the second bandwidth part, wherein the second bandwidth part is outside a channel bandwidth of the UE in the first bandwidth part, and wherein the second bandwidth part is an initial bandwidth part; and transmit a RACH communication in the second bandwidth part using the second physical RACH occasion of the second bandwidth part.
[0012] In some aspects, a network node for wireless communication includes one or more memories; and one or more processors, coupled to the one or more memories, the one or more processors individually or collectively configured to: communicate, with a UE, in a first bandwidth part, wherein the first bandwidth part is a non-initial bandwidth part configured without a first physical RACH occasion; and receive a RACH communication in a second bandwidth part using a second physical RACH occasion of a second bandwidth part, wherein the second bandwidth part is another non-initial bandwidth part.
[0013] In some aspects, a network node for wireless communication includes one or more memories; and one or more processors, coupled to the one or more memories, the one or more processors individually or collectively configured to: communicate, with a UE, in a first bandwidth part, wherein the first bandwidth part is a non-initial bandwidth part configured without a first physical RACH occasion; and receive a RACH communication in a second bandwidth part using a second physical RACH occasion of the second bandwidth part, wherein the second bandwidth part is outside a channel bandwidth of the UE in the first bandwidth part, and wherein the second bandwidth part is an initial bandwidth part.
[0014] In some aspects, an apparatus for wireless communication includes means for communicating, with a network node, in a first bandwidth part, wherein the first bandwidth part is a non-initial bandwidth part configured without a first physical RACH occasion; means for transitioning, from the first bandwidth part to a second bandwidth part, to access a second physical RACH occasion of the second bandwidth part, wherein the second bandwidth part is another non-initial bandwidth part; and means for transmitting a RACH communication in the second bandwidth part using the second physical RACH occasion of the second bandwidth part.
[0015] In some aspects, an apparatus for wireless communication includes means for communicating, with a network node, in a first bandwidth part, wherein the first bandwidth part is a non-initial bandwidth part configured without a first physical RACH occasion; means for transitioning, from the first bandwidth part to a second bandwidth part, to access a second physical RACH occasion of the second bandwidth part, wherein the second bandwidth part is outside a channel bandwidth of the apparatus in the first bandwidth part, and wherein the second bandwidth part is an initial bandwidth part; and means for transmitting a RACH communication in the second bandwidth part using the second physical RACH occasion of the second bandwidth part.
[0016] In some aspects, an apparatus for wireless communication includes means for communicating, with a UE, in a first bandwidth part, wherein the first bandwidth part is a non-initial bandwidth part configured without a first physical RACH occasion; and means for receiving a RACH communication in a second bandwidth part using a second physical RACH occasion of a second bandwidth part, wherein the second bandwidth part is another non-initial bandwidth part.
[0017] In some aspects, an apparatus for wireless communication includes means for communicating, with a UE, in a first bandwidth part, wherein the first bandwidth part is a non-initial bandwidth part configured without a first physical RACH occasion; and means for receiving a RACH communication in a second bandwidth part using a second physical RACH occasion of the second bandwidth part, wherein the second bandwidth part is outside a channel bandwidth of the UE in the first bandwidth part, and wherein the second bandwidth part is an initial bandwidth part.
[0018] In some aspects, a non-transitory computer-readable medium storing a set of instructions for wireless communication includes one or more instructions that, when executed by one or more processors of a UE, cause the UE to: communicate, with a network node, in a first bandwidth part, wherein the first bandwidth part is a non-initial bandwidth part configured without a first physical RACH occasion; transition, from the first bandwidth part to a second bandwidth part, to access a second physical RACH occasion of the second bandwidth part, wherein the second bandwidth part is another non-initial bandwidth part; and transmit a RACH communication in the second bandwidth part using the second physical RACH occasion of the second bandwidth part.
[0019] In some aspects, a non-transitory computer-readable medium storing a set of instructions for wireless communication includes one or more instructions that, when executed by one or more processors of an UE, cause the UE to: communicate, with a network node, in a first bandwidth part, wherein the first bandwidth part is a non-initial bandwidth part configured without a first physical RACH occasion; transition, from the first bandwidth part to a second bandwidth part, to access a second physical RACH occasion of the second bandwidth part, wherein the second bandwidth part is outside a channel bandwidth of the UE in the first bandwidth part, and wherein the second bandwidth part is an initial bandwidth part; and transmit a RACH communication in the second bandwidth part using the second physical RACH occasion of the second bandwidth part.
[0020] In some aspects, a non-transitory computer-readable medium storing a set of instructions for wireless communication includes one or more instructions that, when executed by one or more processors of a network node, cause the network node to: communicate, with a UE, in a first bandwidth part, wherein the first bandwidth part is a non-initial bandwidth part configured without a first physical RACH occasion; and receive a RACH communication in a second bandwidth part using a second physical RACH occasion of a second bandwidth part, wherein the second bandwidth part is another non-initial bandwidth part.
[0021] In some aspects, a non-transitory computer-readable medium storing a set of instructions for wireless communication includes one or more instructions that, when executed by one or more processors of a network node, cause the network node to: communicate, with a UE, in a first bandwidth part, wherein the first bandwidth part is a non-initial bandwidth part configured without a first physical RACH occasion; and receive a RACH communication in a second bandwidth part using a second physical RACH occasion of the second bandwidth part, wherein the second bandwidth part is outside a channel bandwidth of the UE in the first bandwidth part, and wherein the second bandwidth part is an initial bandwidth part.
[0022] Aspects generally include a method, apparatus, system, computer program product, non-transitory computer-readable medium, user equipment, base station, network entity, network node, wireless communication device, and / or processing system as substantially described herein with reference to and as illustrated by the drawings and specification.
[0023] The foregoing has outlined rather broadly the features and technical advantages of examples according to the disclosure in order that the detailed description that follows may be better understood. Additional features and advantages will be described hereinafter. The conception and specific examples disclosed may be readily utilized as a basis for modifying or designing other structures for carrying out the same purposes of the present disclosure. Such equivalent constructions do not depart from the scope of the appended claims. Characteristics of the concepts disclosed herein, both their organization and method of operation, together with associated advantages, will be better understood from the following description when considered in connection with the accompanying figures. Each of the figures is provided for the purposes of illustration and description, and not as a definition of the limits of the claims.
[0024] While aspects are described in the present disclosure by illustration to some examples, those skilled in the art will understand that such aspects may be implemented in many different arrangements and scenarios. Techniques described herein may be implemented using different platform types, devices, systems, shapes, sizes, and / or packaging arrangements. For example, some aspects may be implemented via integrated chip embodiments or other non-module-component based devices (e.g., end-user devices, vehicles, communication devices, computing devices, industrial equipment, retail / purchasing devices, medical devices, and / or artificial intelligence devices) . Aspects may 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 described aspects and features may include additional components and features for implementation and practice of claimed and described aspects. For example, 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) . It is intended that aspects described herein may be practiced in a wide variety of devices, components, systems, distributed arrangements, and / or end-user devices of varying size, shape, and constitution.BRIEF DESCRIPTION OF THE DRAWINGS
[0025] So that the above-recited features of the present disclosure can be understood in detail, a more particular description, briefly summarized above, may be had by reference to aspects, some of which are illustrated in the appended drawings. It is to be noted, however, that the appended drawings illustrate only certain typical aspects of this disclosure and are therefore not to be considered limiting of its scope, for the description may admit to other equally effective aspects. The same reference numbers in different drawings may identify the same or similar elements.
[0026] Fig. 1 is a diagram illustrating an example of a wireless network, in accordance with the present disclosure.
[0027] Fig. 2 is a diagram illustrating an example of a network node in communication with a user equipment (UE) in a wireless network, in accordance with the present disclosure.
[0028] Fig. 3 is a diagram illustrating an example disaggregated base station architecture, in accordance with the present disclosure.
[0029] Fig. 4 is a diagram illustrating an example of a four-step random access channel (RACH) procedure, in accordance with the present disclosure.
[0030] Fig. 5 is a diagram illustrating an example of a bandwidth part (BWP) resource allocation, in accordance with the present disclosure.
[0031] Figs. 6A-6C are diagrams illustrating an example associated with RACH triggered BWP switching, in accordance with the present disclosure.
[0032] Fig. 7 is a diagram illustrating an example process performed, for example, at a UE or an apparatus of a UE, in accordance with the present disclosure.
[0033] Fig. 8 is a diagram illustrating an example process performed, for example, at a UE or an apparatus of a UE, in accordance with the present disclosure.
[0034] Fig. 9 is a diagram illustrating an example process performed, for example, at a network node or an apparatus of a network node, in accordance with the present disclosure.
[0035] Fig. 10 is a diagram illustrating an example process performed, for example, at a network node or an apparatus of a network node, in accordance with the present disclosure.
[0036] Fig. 11 is a diagram of an example apparatus for wireless communication, in accordance with the present disclosure.
[0037] Fig. 12 is a diagram of an example apparatus for wireless communication, in accordance with the present disclosure.DETAILED DESCRIPTION
[0038] In some communications systems, a channel bandwidth may be divided into a set of bandwidth parts (BWPs) on which different user equipment (UEs) can communicate. A network node can configure different BWPs with different characteristics, such as configuring a BWP as an initial BWP (e.g., a BWP on which UEs can obtain initial access) or a non-initial BWP (e.g., a BWP to which a UE can transfer after obtaining initial access) . Additionally, or alternatively, the network node can configure some BWPs with physical random access channel (RACH) (PRACH) occasions for performing RACH procedures and other BWPs without PRACH occasions. A reduced capability (RedCap) UE, as described in more detail herein, may operate in a connected mode on radio resource control (RRC) -dedicated non-initial uplink BWP that is configured without PRACH occasions, which may be set as a first active uplink BWP.
[0039] When a RedCap UE attempts to initiate a PRACH procedure and an initial uplink BWP for RedCap UEs is configured within a channel bandwidth of the UE (e.g., when the UE is operating on the non-initial uplink BWP configured without PRACH occasions) , the UE can autonomously switch to the initial uplink BWP to access physical RACH occasions (ROs) of the initial uplink BWP. The UE may use the ROs of the initial uplink BWP for a PRACH procedure (e.g., to transmit a RACH message) . Alternatively, when the initial uplink BWP for RedCap UEs is not configured or is not within a channel bandwidth of the UE, the UE cannot switch to the initial uplink BWP. As a result, the UE may fail to initiate or complete a PRACH procedure, which may result in a radio link failure (RLF) , a beam failure, an out-of-sync (OOS) state, a failure to receive or transmit data, or a scheduling request failure. Accordingly, the UE may re-initiate acquisition and cell selection, which may result in a communication delay and / or utilization of excess network resources for signaling overhead associated with the acquisition and cell selection procedure.
[0040] Some aspects described herein enable RACH triggered autonomous BWP switching to non-initial BWPs to access ROs. For example, when the UE is to initiate a PRACH procedure (e.g., transmit a RACH communication) in a non-initial BWP that is not configured with ROs, the UE may switch to a configured non-initial BWP that is configured with ROs (e.g., rather than attempting and failing to switch to an initial BWP that is outside a channel bandwidth or that is not configured) . Additionally, or alternatively, the UE may autonomously update a channel bandwidth and switch to an initial BWP (e.g., that was otherwise outside of the channel bandwidth of the UE) . In this way, the UE ensures that the UE can access ROs for performing a RACH procedure. Based at least in part on enabling autonomous BWP switching and / or channel bandwidth modification, the UE avoids triggering an acquisition and cell selection procedure, thereby avoiding dropped communication, communication delay, and / or utilization of excess network resources for signaling overhead.
[0041] Various aspects of the disclosure are described more fully hereinafter with reference to the accompanying drawings. This disclosure may, however, be embodied in many different forms and should not be construed as limited to any specific structure or function presented throughout this disclosure. Rather, these aspects are provided so that this disclosure will be thorough and complete, and will fully convey the scope of the disclosure to those skilled in the art. One skilled in the art should appreciate that the scope of the disclosure is intended to cover any aspect of the disclosure disclosed herein, whether implemented independently of or combined with any other aspect of the disclosure. For example, an apparatus may be implemented or a method may be practiced using any number of the aspects set forth herein. In addition, the scope of the disclosure is intended to cover such an apparatus or method which is practiced using other structure, functionality, or structure and functionality in addition to or other than the various aspects of the disclosure set forth herein. It should be understood that any aspect of the disclosure disclosed herein may be embodied by one or more elements of a claim.
[0042] Several aspects of telecommunication systems will now be presented with reference to various apparatuses and techniques. These apparatuses and techniques will be described in the following detailed description and illustrated in the accompanying drawings by various blocks, modules, components, circuits, steps, processes, algorithms, or the like (collectively referred to as “elements” ) . These elements may be implemented using hardware, software, or combinations thereof. Whether such elements are implemented as hardware or software depends upon the particular application and design constraints imposed on the overall system.
[0043] While aspects may be described herein using terminology commonly associated with a 5G or New Radio (NR) radio access technology (RAT) , aspects of the present disclosure can be applied to other RATs, such as a 3G RAT, a 4G RAT, and / or a RAT subsequent to 5G (e.g., 6G) .
[0044] Fig. 1 is a diagram illustrating an example of a wireless network 100, in accordance with the present disclosure. The wireless network 100 may be or may include elements of a 5G (e.g., NR) network and / or a 4G (e.g., Long Term Evolution (LTE) ) network, among other examples. The wireless network 100 may include one or more network nodes 110 (shown as a network node 110a, a network node 110b, a network node 110c, and a network node 110d) , a UE 120 or multiple UEs 120 (shown as a UE 120a, a UE 120b, a UE 120c, a UE 120d, and a UE 120e) , and / or other entities. A network node 110 is a network node that communicates with UEs 120. As shown, a network node 110 may include one or more network nodes. For example, a network node 110 may 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, a network node 110 may be a disaggregated network node (sometimes referred to as a disaggregated base station) , meaning that the 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) ) .
[0045] In some examples, a network node 110 is or includes a network node that communicates with UEs 120 via a radio access link, such as an RU. In some examples, a network node 110 is or includes a network node that communicates with other network nodes 110 via a fronthaul link or a midhaul link, such as a DU. In some examples, a network node 110 is or includes a network node that communicates with other network nodes 110 via a midhaul link or a core network via a backhaul link, such as a CU. In some examples, a network node 110 (such as an aggregated network node 110 or a disaggregated network node 110) may include multiple network nodes, such as one or more RUs, one or more CUs, and / or one or more DUs. A network node 110 may include, for example, an NR base station, an LTE base station, a Node B, an eNB (e.g., in 4G) , a gNB (e.g., in 5G) , an access point, a transmission reception point (TRP) , a DU, an RU, a CU, a mobility element of a network, a core network node, a network element, a network equipment, a RAN node, or a combination thereof. In some examples, the network nodes 110 may be interconnected to one another or to one or more other network nodes 110 in the wireless network 100 through various types of fronthaul, midhaul, and / or backhaul interfaces, such as a direct physical connection, an air interface, or a virtual network, using any suitable transport network.
[0046] In some examples, a network node 110 may provide communication coverage for a particular geographic area. In the Third Generation Partnership Project (3GPP) , the term “cell” can refer to a coverage area of a network node 110 and / or a network node subsystem serving this coverage area, depending on the context in which the term is used. A network node 110 may provide communication coverage for a macro cell, a pico cell, a femto cell, and / or another type of cell. A macro cell may cover a relatively large geographic area (e.g., several kilometers in radius) and may allow unrestricted access by UEs 120 with service subscriptions. A pico cell may cover a relatively small geographic area and may allow unrestricted access by UEs 120 with service subscriptions. A femto cell may cover a relatively small geographic area (e.g., a home) and may allow restricted access by UEs 120 having association with the femto cell (e.g., UEs 120 in a closed subscriber group (CSG) ) . A network node 110 for a macro cell may be referred to as a macro network node. A network node 110 for a pico cell may be referred to as a pico network node. A network node 110 for a femto cell may be referred to as a femto network node or an in-home network node. In the example shown in Fig. 1, the network node 110a may be a macro network node for a macro cell 102a, the network node 110b may be a pico network node for a pico cell 102b, and the network node 110c may be a femto network node for a femto cell 102c. A network node may support one or multiple (e.g., three) cells. In some examples, a cell may not necessarily be stationary, and the geographic area of the cell may move according to the location of a network node 110 that is mobile (e.g., a mobile network node) .
[0047] In some aspects, the terms “base station” or “network node” may refer to an aggregated base station, a disaggregated 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, a DU, an 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 terms “base station” or “network node” may refer to one device configured to perform one or more functions, such as those described herein in connection with the network node 110. In some aspects, the terms “base station” or “network node” may refer to a plurality of devices configured to perform the one or more functions. For example, in some distributed systems, each of a quantity of different devices (which may be located in the same geographic location or in different geographic locations) may be configured to perform at least a portion of a function, or to duplicate performance of at least a portion of the function, and the terms “base station” or “network node” may refer to any one or more of those different devices. In some aspects, the terms “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 may be instantiated on a single device. In some aspects, the terms “base station” or “network node” may refer to one of the base station functions and not another. In this way, a single device may include more than one base station.
[0048] The wireless network 100 may include one or more relay stations. A relay station is a network node that can receive a transmission of data from an upstream node (e.g., a network node 110 or a UE 120) and send a transmission of the data to a downstream node (e.g., a UE 120 or a network node 110) . A relay station may be a UE 120 that can relay transmissions for other UEs 120. In the example shown in Fig. 1, the network node 110d (e.g., a relay network node) may communicate with the network node 110a (e.g., a macro network node) and the UE 120d in order to facilitate communication between the network node 110a and the UE 120d. A network node 110 that relays communications may be referred to as a relay station, a relay base station, a relay network node, a relay node, a relay, or the like.
[0049] The wireless network 100 may be a heterogeneous network that includes network nodes 110 of different types, such as macro network nodes, pico network nodes, femto network nodes, relay network nodes, or the like. These different types of network nodes 110 may have different transmit power levels, different coverage areas, and / or different impacts on interference in the wireless network 100. For example, macro network nodes may have a high transmit power level (e.g., 5 to 40 watts) whereas pico network nodes, femto network nodes, and relay network nodes may have lower transmit power levels (e.g., 0.1 to 2 watts) .
[0050] A network controller 130 may couple to or communicate with a set of network nodes 110 and may provide coordination and control for these network nodes 110. The network controller 130 may communicate with the network nodes 110 via a backhaul communication link or a midhaul communication link. The network nodes 110 may communicate with one another directly or indirectly via a wireless or wireline backhaul communication link. In some aspects, the network controller 130 may be a CU or a core network device, or may include a CU or a core network device.
[0051] The UEs 120 may be dispersed throughout the wireless network 100, and each UE 120 may be stationary or mobile. A UE 120 may include, for example, an access terminal, a terminal, a mobile station, and / or a subscriber unit. A UE 120 may be a cellular phone (e.g., a smart phone) , 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, a camera, a gaming device, a netbook, a smartbook, an ultrabook, a medical device, a biometric device, a wearable device (e.g., a smart watch, smart clothing, smart glasses, a smart wristband, smart jewelry (e.g., a smart ring or a smart bracelet) ) , an entertainment device (e.g., a music device, a video device, and / or a satellite radio) , a vehicular component or sensor, a smart meter / sensor, industrial manufacturing equipment, a global positioning system device, a UE function of a network node, and / or any other suitable device that is configured to communicate via a wireless or wired medium.
[0052] Some UEs 120 may be considered machine-type communication (MTC) or evolved or enhanced machine-type communication (eMTC) UEs. An MTC UE and / or an eMTC UE may include, for example, a robot, an unmanned aerial vehicle, a remote device, a sensor, a meter, a monitor, and / or a location tag, that may communicate with a network node, 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 a Customer Premises Equipment. A UE 120 may be included inside a housing that houses components of the UE 120, such as processor components and / or memory components. In some examples, the processor components and the memory components may be coupled together. For example, the processor components (e.g., one or more processors) and the memory components (e.g., a memory) may be operatively coupled, communicatively coupled, electronically coupled, and / or electrically coupled.
[0053] In general, any number of wireless networks 100 may be deployed in a given geographic area. Each wireless network 100 may support a particular RAT and may operate on one or more frequencies. A RAT may be referred to as a radio technology, an air interface, or the like. A frequency may be referred to as a carrier, a frequency channel, or the like. Each frequency may support a single RAT in a given geographic area in order to avoid interference between wireless networks of different RATs. In some cases, NR or 5G RAT networks may be deployed.
[0054] 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 a network node 110 as an intermediary to communicate with one another) . For example, the UEs 120 may communicate using peer-to-peer (P2P) communications, device-to-device (D2D) communications, a vehicle-to-everything (V2X) protocol (e.g., which may include a vehicle-to-vehicle (V2V) protocol, a vehicle-to-infrastructure (V2I) protocol, or a vehicle-to-pedestrian (V2P) protocol) , and / or a mesh network. In such examples, a UE 120 may perform scheduling operations, resource selection operations, and / or other operations described elsewhere herein as being performed by the network node 110.
[0055] Devices of the wireless network 100 may communicate using the electromagnetic spectrum, which may be subdivided by frequency or wavelength into various classes, bands, channels, or the like. For example, devices of the wireless network 100 may communicate using one or more operating bands. In 5G NR, two initial operating bands have been identified as frequency range designations FR1 (410 MHz –7.125 GHz) and FR2 (24.25 GHz –52.6 GHz) . It should be understood that although a portion of FR1 is greater than 6 GHz, FR1 is often referred to (interchangeably) as a “Sub-6 GHz” band in various documents and articles. A similar nomenclature issue sometimes occurs with regard to FR2, which is often referred to (interchangeably) as a “millimeter wave” band in documents and articles, despite being different from the extremely high frequency (EHF) band (30 GHz –300 GHz) which is identified by the International Telecommunications Union (ITU) as a “millimeter wave” band.
[0056] The frequencies between FR1 and FR2 are often referred to as mid-band frequencies. Recent 5G NR studies have identified an operating band for these mid-band frequencies as frequency range designation FR3 (7.125 GHz –24.25 GHz) . Frequency bands falling within FR3 may inherit FR1 characteristics and / or FR2 characteristics, and thus may effectively extend features of FR1 and / or FR2 into mid-band frequencies. In addition, higher frequency bands are currently being explored to extend 5G NR operation beyond 52.6 GHz. For example, three higher operating bands have been identified as 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.
[0057] With the above examples in mind, unless specifically stated otherwise, it should be understood that the term “sub-6 GHz” or the like, if used herein, may broadly represent frequencies that may be less than 6 GHz, may be within FR1, or may include mid-band frequencies. Further, unless specifically stated otherwise, it should be understood that the term “millimeter wave” or the like, if used herein, may broadly represent frequencies that may include mid-band frequencies, may be within FR2, FR4, FR4-a or FR4-1, and / or FR5, or may be within the EHF band. It is contemplated that the frequencies included in these operating bands (e.g., FR1, FR2, FR3, FR4, FR4-a, FR4-1, and / or FR5) may be modified, and techniques described herein are applicable to those modified frequency ranges.
[0058] In some aspects, the UE 120 may include a communication manager 140. As described in more detail elsewhere herein, the communication manager 140 may communicate, with a network node, in a first bandwidth part, wherein the first bandwidth part is a non-initial bandwidth part configured without a first physical RACH occasion; transition, from the first bandwidth part to a second bandwidth part, to access a second physical RACH occasion of the second bandwidth part, wherein the second bandwidth part is another non-initial bandwidth part; and transmit a RACH communication in the second bandwidth part using the second physical RACH occasion of the second bandwidth part. Additionally, or alternatively, the communication manager 140 may communicate, with a network node, in a first bandwidth part, wherein the first bandwidth part is a non-initial bandwidth part configured without a first physical RACH occasion; transition, from the first bandwidth part to a second bandwidth part, to access a second physical RACH occasion of the second bandwidth part, wherein the second bandwidth part is outside a channel bandwidth of the UE in the first bandwidth part, and wherein the second bandwidth part is an initial bandwidth part; and transmit a RACH communication in the second bandwidth part using the second physical RACH occasion of the second bandwidth part. Additionally, or alternatively, the communication manager 140 may perform one or more other operations described herein.
[0059] In some aspects, the network node 110 may include a communication manager 150. As described in more detail elsewhere herein, the communication manager 150 may communicate, with a UE, in a first bandwidth part, wherein the first bandwidth part is a non-initial bandwidth part configured without a first physical RACH occasion; and receive a RACH communication in a second bandwidth part using a second physical RACH occasion of a second bandwidth part, wherein the second bandwidth part is another non-initial bandwidth part. Additionally, or alternatively, the communication manager 150 may communicate, with a UE, in a first bandwidth part, wherein the first bandwidth part is a non-initial bandwidth part configured without a first physical RACH occasion; and receive a RACH communication in a second bandwidth part using a second physical RACH occasion of the second bandwidth part, wherein the second bandwidth part is outside a channel bandwidth of the UE in the first bandwidth part, and wherein the second bandwidth part is an initial bandwidth part. Additionally, or alternatively, the communication manager 150 may perform one or more other operations described herein.
[0060] As indicated above, Fig. 1 is provided as an example. Other examples may differ from what is described with regard to Fig. 1.
[0061] Fig. 2 is a diagram illustrating an example 200 of a network node 110 in communication with a UE 120 in a wireless network 100, in accordance with the present disclosure. The network node 110 may be equipped with a set of antennas 234a through 234t, such as T antennas (T ≥ 1) . The UE 120 may be equipped with a set of antennas 252a through 252r, such as R antennas (R ≥ 1) . The network node 110 of example 200 includes one or more radio frequency components, such as antennas 234 and a modem 232. In some examples, a network node 110 may include an interface, a communication component, or another component that facilitates communication with the UE 120 or another network node. Some network nodes 110 may not include radio frequency components that facilitate direct communication with the UE 120, such as one or more CUs, or one or more DUs.
[0062] At the network node 110, a transmit processor 220 may receive data, from a data source 212, intended for the UE 120 (or a set of UEs 120) . The transmit processor 220 may select one or more modulation and coding schemes (MCSs) for the UE 120 based at least in part on one or more channel quality indicators (CQIs) received from that UE 120. The network node 110 may process (e.g., encode and modulate) the data for the UE 120 based at least in part on the MCS (s) selected for the UE 120 and may provide data symbols for the UE 120. The transmit processor 220 may process system information (e.g., for semi-static resource partitioning information (SRPI) ) and control information (e.g., CQI requests, grants, and / or upper layer signaling) and provide overhead symbols and control symbols. The transmit processor 220 may generate reference symbols for reference signals (e.g., a cell-specific reference signal (CRS) or a demodulation reference signal (DMRS) ) and synchronization signals (e.g., a primary synchronization signal (PSS) or a secondary synchronization signal (SSS) ) . A transmit (TX) multiple-input multiple-output (MIMO) processor 230 may perform spatial processing (e.g., precoding) on the data symbols, the control symbols, the overhead symbols, and / or the reference symbols, if applicable, and may provide a set of output symbol streams (e.g., T output symbol streams) to a corresponding set of modems 232 (e.g., T modems) , shown as modems 232a through 232t. For example, each output symbol stream may be provided to a modulator component (shown as MOD) of a modem 232. Each modem 232 may use a respective modulator component to process a respective output symbol stream (e.g., for OFDM) to obtain an output sample stream. Each modem 232 may further use a respective modulator component to process (e.g., convert to analog, amplify, filter, and / or upconvert) the output sample stream to obtain a downlink signal. The modems 232a through 232t may transmit a set of downlink signals (e.g., T downlink signals) via a corresponding set of antennas 234 (e.g., T antennas) , shown as antennas 234a through 234t.
[0063] At the UE 120, a set of antennas 252 (shown as antennas 252a through 252r) may receive the downlink signals from the network node 110 and / or other network nodes 110 and may 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 through 254r. For example, each received signal may be provided to a demodulator component (shown as DEMOD) of a modem 254. Each modem 254 may use a respective demodulator component to condition (e.g., filter, amplify, downconvert, and / or digitize) a received signal to obtain input samples. Each modem 254 may use a demodulator component to further process the input samples (e.g., for OFDM) to obtain received symbols. A MIMO detector 256 may obtain received symbols from the modems 254, may perform MIMO detection on the received symbols if applicable, and may provide detected symbols. A receive processor 258 may process (e.g., demodulate and decode) the detected symbols, may provide decoded data for the UE 120 to a data sink 260, and may provide decoded control information and system information to a controller / processor 280. The term “controller / processor” may refer to one or more controllers, one or more processors, or a combination thereof. A channel processor may determine a reference signal received power (RSRP) parameter, a received signal strength indicator (RSSI) parameter, a reference signal received quality (RSRQ) parameter, and / or a CQI parameter, among other examples. In some examples, one or more components of the UE 120 may be included in a housing 284.
[0064] The network controller 130 may include a communication unit 294, a controller / processor 290, and a memory 292. The network controller 130 may include, for example, one or more devices in a core network. The network controller 130 may communicate with the network node 110 via the communication unit 294.
[0065] One or more antennas (e.g., antennas 234a through 234t and / or antennas 252a through 252r) may include, or may be included within, one or more antenna panels, one or more antenna groups, one or more sets of antenna elements, and / or one or more antenna arrays, among other examples. An antenna panel, an antenna group, a set of antenna elements, and / or an antenna array 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 one or more antenna elements coupled to one or more transmission and / or reception components, such as one or more components of Fig. 2.
[0066] On the uplink, at the UE 120, a transmit processor 264 may receive and process data from a data source 262 and control information (e.g., for reports that include RSRP, RSSI, RSRQ, and / or CQI) from the controller / processor 280. The transmit processor 264 may generate reference symbols for one or more reference signals. The symbols from the transmit processor 264 may be precoded by a TX MIMO processor 266 if applicable, further processed by the modems 254 (e.g., for DFT-s-OFDM or CP-OFDM) , and transmitted to the network node 110. In some examples, the modem 254 of the UE 120 may include a modulator and a demodulator. In some examples, the UE 120 includes a transceiver. The transceiver may include any combination of the antenna (s) 252, the modem (s) 254, the MIMO detector 256, the receive processor 258, the transmit processor 264, and / or the TX MIMO processor 266. The transceiver may be used by a processor (e.g., the controller / processor 280) and the memory 282 to perform aspects of any of the methods described herein (e.g., with reference to Figs. 6A-12) .
[0067] At the network node 110, the uplink signals from UE 120 and / or other UEs may be received by the antennas 234, processed by the modem 232 (e.g., a demodulator component, shown as DEMOD, of the modem 232) , detected by a MIMO detector 236 if applicable, and further processed by a receive processor 238 to obtain decoded data and control information sent by the UE 120. The receive processor 238 may provide the decoded data to a data sink 239 and provide the decoded control information to the controller / processor 240. The network node 110 may include a communication unit 244 and may communicate with the network controller 130 via the communication unit 244. The network node 110 may include a scheduler 246 to schedule one or more UEs 120 for downlink and / or uplink communications. In some examples, the modem 232 of the network node 110 may include a modulator and a demodulator. In some examples, the network node 110 includes a transceiver. The transceiver may include any combination of the antenna (s) 234, the modem (s) 232, the MIMO detector 236, the receive processor 238, the transmit processor 220, and / or the TX MIMO processor 230. The transceiver may be used by a processor (e.g., the controller / processor 240) and the memory 242 to perform aspects of any of the methods described herein (e.g., with reference to Figs. 6A-12) .
[0068] The controller / processor 240 of the network node 110, the controller / processor 280 of the UE 120, and / or any other component (s) of Fig. 2 may perform one or more techniques associated with RACH triggered BWP switching, as described in more detail elsewhere herein. For example, the controller / processor 240 of the network node 110, the controller / processor 280 of the UE 120, and / or any other component (s) of Fig. 2 may perform or direct operations of, for example, process 700 of Fig. 7, process 800 of Fig. 8, process 900 of Fig. 9, process 1000 of Fig. 10, and / or other processes as described herein. The memory 242 and the memory 282 may store data and program codes for the network node 110 and the UE 120, respectively. In some examples, the memory 242 and / or the 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, the one or more instructions, when executed (e.g., directly, or after compiling, converting, and / or interpreting) by one or more processors of the network node 110 and / or the UE 120, may cause the one or more processors, the UE 120, and / or the network node 110 to perform or direct operations of, for example, process 700 of Fig. 7, process 800 of Fig. 8, process 900 of Fig. 9, process 1000 of Fig. 10, and / or other processes as described herein. In some examples, executing instructions may include running the instructions, converting the instructions, compiling the instructions, and / or interpreting the instructions, among other examples.
[0069] In some aspects, the UE 120 includes means for communicating, with a network node, in a first bandwidth part, wherein the first bandwidth part is a non-initial bandwidth part configured without a first physical RACH occasion; means for transitioning, from the first bandwidth part to a second bandwidth part, to access a second physical RACH occasion of the second bandwidth part, wherein the second bandwidth part is another non-initial bandwidth part; and / or means for transmitting a RACH communication in the second bandwidth part using the second physical RACH occasion of the second bandwidth part. In some aspects, the UE 120 includes means for communicating, with a network node, in a first bandwidth part, wherein the first bandwidth part is a non-initial bandwidth part configured without a first physical RACH occasion; means for transitioning, from the first bandwidth part to a second bandwidth part, to access a second physical RACH occasion of the second bandwidth part, wherein the second bandwidth part is outside a channel bandwidth of the UE 120 in the first bandwidth part, and wherein the second bandwidth part is an initial bandwidth part; and / or means for transmitting a RACH communication in the second bandwidth part using the second physical RACH occasion of the second bandwidth part. The means for the UE 120 to perform operations described herein may include, for example, one or more of communication manager 140, antenna 252, modem 254, MIMO detector 256, receive processor 258, transmit processor 264, TX MIMO processor 266, controller / processor 280, or memory 282.
[0070] In some aspects, the network node 110 includes means for communicating, with a UE, in a first bandwidth part, wherein the first bandwidth part is a non-initial bandwidth part configured without a first physical RACH occasion; and / or means for receiving a RACH communication in a second bandwidth part using a second physical RACH occasion of a second bandwidth part, wherein the second bandwidth part is another non-initial bandwidth part. In some aspects, the network node 110 includes means for communicating, with a UE, in a first bandwidth part, wherein the first bandwidth part is a non-initial bandwidth part configured without a first physical RACH occasion; and / or means for receiving a RACH communication in a second bandwidth part using a second physical RACH occasion of the second bandwidth part, wherein the second bandwidth part is outside a channel bandwidth of the UE in the first bandwidth part, and wherein the second bandwidth part is an initial bandwidth part. The means for the network node 110 to perform operations described herein may include, for example, one or more of 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.
[0071] In some aspects, an individual processor may perform all of the functions described as being performed by the one or more processors. In some aspects, one or more processors may collectively perform a set of functions. For example, a first set of (one or more) processors of the one or more processors may perform a first function described as being performed by the one or more processors, and a second set of (one or more) processors of the one or more processors may perform a second function described as being performed by the one or more processors. The first set of processors and the second set of processors may be the same set of processors or may be different sets of processors. Reference to “one or more processors” should be understood to refer to any one or more of the processors described in connection with Fig. 2. Reference to “one or more memories” should be understood to refer to any one or more memories of a corresponding device, such as the memory described in connection with Fig. 2. For example, functions described as being performed by one or more memories can be performed by the same subset of the one or more memories or different subsets of the one or more memories.
[0072] While blocks in Fig. 2 are illustrated as distinct components, the functions described above with respect to the blocks may be implemented in a single hardware, software, or combination component or in various combinations of components. For example, the functions described with respect to the transmit processor 264, the receive processor 258, and / or the TX MIMO processor 266 may be performed by or under the control of the controller / processor 280.
[0073] As indicated above, Fig. 2 is provided as an example. Other examples may differ from what is described with regard to Fig. 2.
[0074] Deployment of communication systems, such as 5G NR systems, may be arranged in multiple manners with various components or constituent parts. In a 5G NR system, or network, a network node, a network entity, a mobility element of a network, a RAN node, a core network node, a network element, a base station, or a network equipment may be implemented in an aggregated or disaggregated architecture. For example, a base station (such as a Node B (NB) , an evolved NB (eNB) , an NR base station, a 5G NB, an access point (AP) , a TRP, or a cell, among other examples) , or one or more units (or one or more components) performing base station functionality, may be implemented as an aggregated base station (also known as a standalone base station or a monolithic base station) or a disaggregated base station. “Network entity” or “network node” may refer to a disaggregated base station, or to one or more units of a disaggregated base station (such as one or more CUs, one or more DUs, one or more RUs, or a combination thereof) .
[0075] An aggregated base station (e.g., an aggregated network node) may 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 unit) . A disaggregated base station (e.g., a disaggregated network node) may be configured to utilize a protocol stack that is physically or logically distributed among two or more units (such as one or more CUs, one or more DUs, or one or more RUs) . In some examples, a 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 throughout one or multiple other network nodes. The DUs may be implemented to communicate with one or more RUs. Each of the CU, DU, and RU also can be implemented as virtual units, such as a virtual central unit (VCU) , a virtual distributed unit (VDU) , or a virtual radio unit (VRU) , among other examples.
[0076] Base station-type operation or network design may consider aggregation characteristics of base station functionality. For example, disaggregated base stations may be utilized in an IAB network, an open radio access network (O-RAN (such as the network configuration sponsored by the O-RAN Alliance) ) , or a virtualized radio access network (vRAN, also known as a cloud radio access network (C-RAN) ) to facilitate scaling of communication systems by separating base station functionality into one or more units that can be individually deployed. A disaggregated base station may include functionality implemented across two or more units at various physical locations, as well as functionality implemented for at least one unit virtually, which can enable flexibility in network design. The various units of the disaggregated base station can be configured for wired or wireless communication with at least one other unit of the disaggregated base station.
[0077] Fig. 3 is a diagram illustrating an example disaggregated base station architecture 300, in accordance with the present disclosure. The disaggregated base station architecture 300 may include a CU 310 that can communicate directly with a core network 320 via a backhaul link, or indirectly with the core network 320 through one or more disaggregated control units (such as a 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) . A CU 310 may communicate with one or more DUs 330 via respective midhaul links, such as through F1 interfaces. Each of the DUs 330 may communicate with one or more RUs 340 via respective fronthaul links. Each of the RUs 340 may communicate with one or more UEs 120 via respective radio frequency (RF) access links. In some implementations, a UE 120 may be simultaneously served by multiple RUs 340.
[0078] Each of the units, including the CUs 310, the DUs 330, the RUs 340, as well as the Near-RT RICs 325, the Non-RT RICs 315, and the SMO Framework 305, may include one or more interfaces or be coupled with one or more interfaces configured to receive or transmit signals, data, or information (collectively, signals) via a wired or wireless transmission medium. Each of the units, or an associated processor or controller providing instructions to one or multiple communication interfaces of the respective unit, can be configured to communicate with one or more of the other units via the transmission medium. In some examples, each of the units can include a wired interface, configured to receive or transmit signals over a wired transmission medium to one or more of the other units, and a wireless interface, which may include a receiver, a transmitter or transceiver (such as an RF transceiver) , configured to receive or transmit signals, or both, over a wireless transmission medium to one or more of the other units.
[0079] In some aspects, the CU 310 may host one or more higher layer control functions. Such control functions can include RRC functions, packet data convergence protocol (PDCP) functions, or service data adaptation protocol (SDAP) functions, among other examples. Each control function can be implemented with an interface configured to communicate signals with other control functions hosted by the CU 310. The CU 310 may be configured to handle user plane functionality (for example, Central Unit –User Plane (CU-UP) functionality) , control plane functionality (for example, Central Unit –Control Plane (CU-CP) functionality) , or a combination 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. A CU-UP unit can communicate bidirectionally with a CU-CP unit via an interface, such as the E1 interface when implemented in an O-RAN configuration. The CU 310 can be implemented to communicate with a DU 330, as necessary, for network control and signaling.
[0080] Each DU 330 may correspond to a logical unit that includes one or more base station functions to control the operation of one or more RUs 340. In some aspects, the DU 330 may host one or more of a radio link control (RLC) layer, a medium access control (MAC) layer, and one or more high physical (PHY) layers depending, at least in part, on a functional split, such as a functional split defined by the 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, among other examples. In some aspects, the DU 330 may further host one or more low PHY layers, such as implemented by one or more modules for a fast Fourier transform (FFT) , an inverse FFT (iFFT) , digital beamforming, or PRACH extraction and filtering, among other examples. Each layer (which also may be referred to as a module) can be implemented with an interface configured to communicate signals with other layers (and modules) hosted by the DU 330, or with the control functions hosted by the CU 310.
[0081] Each RU 340 may implement lower-layer functionality. In some deployments, an RU 340, controlled by a DU 330, may correspond to a logical node that hosts RF processing functions or low-PHY layer functions, such as performing an FFT, performing an iFFT, digital beamforming, or PRACH extraction and filtering, among other examples, based on a functional split (for example, a functional split defined by the 3GPP) , such as a lower layer functional split. In such an architecture, each RU 340 can be operated to handle over the air (OTA) communication with one or more UEs 120. In some implementations, real-time and non-real-time aspects of control and user plane communication with the RU (s) 340 can be controlled by the corresponding DU 330. In some scenarios, this configuration can enable each DU 330 and the CU 310 to be implemented in a cloud-based RAN architecture, such as a vRAN architecture.
[0082] The SMO Framework 305 may be configured to support RAN deployment and provisioning of non-virtualized and virtualized network elements. For non-virtualized network elements, the SMO Framework 305 may be configured to support the deployment of dedicated physical resources for RAN coverage requirements, which may be managed via an operations and maintenance interface (such as an O1 interface) . For virtualized network elements, the SMO Framework 305 may be configured to interact with a cloud computing platform (such as an open cloud (O-Cloud) platform 390) to perform network element life cycle management (such as to instantiate virtualized network elements) via a cloud computing platform interface (such as an O2 interface) . Such virtualized network elements can include, but are not limited to, CUs 310, DUs 330, RUs 340, non-RT RICs 315, and Near-RT RICs 325. In some implementations, the SMO Framework 305 can communicate with a hardware aspect of a 4G RAN, such as an open eNB (O-eNB) 311, via an O1 interface. Additionally, in some implementations, the SMO Framework 305 can communicate directly with each of one or more RUs 340 via a respective O1 interface. The SMO Framework 305 also may include a Non-RT RIC 315 configured to support functionality of the SMO Framework 305.
[0083] The Non-RT RIC 315 may be configured to include a logical function that enables non-real-time control and optimization of RAN elements and resources, Artificial Intelligence / Machine Learning (AI / ML) workflows including model training and updates, or policy-based guidance of applications / features in the Near-RT RIC 325. The Non-RT RIC 315 may be coupled to or communicate with (such as via an A1 interface) the Near-RT RIC 325. The Near-RT RIC 325 may be configured to include a logical function that enables near-real-time control and optimization of RAN elements and resources via data collection and actions over an interface (such as via an E2 interface) connecting one or more CUs 310, one or more DUs 330, or both, as well as an O-eNB, with the Near-RT RIC 325.
[0084] 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 external servers. Such information may be utilized by the Near-RT RIC 325 and may be received at the SMO Framework 305 or the Non-RT RIC 315 from non-network data sources or from network functions. In some examples, the Non-RT RIC 315 or the 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 for performance and employ AI / ML models to perform corrective actions through the SMO Framework 305 (such as reconfiguration via an O1 interface) or via creation of RAN management policies (such as A1 interface policies) .
[0085] As indicated above, Fig. 3 is provided as an example. Other examples may differ from what is described with regard to Fig. 3.
[0086] Fig. 4 is a diagram illustrating an example 400 of a four-step random access procedure, in accordance with the present disclosure. As shown in Fig. 4, a network node 110 and a UE 120 may communicate with one another to perform the four-step random access procedure.
[0087] As shown by reference number 405, the network node 110 may transmit, and the UE 120 may receive, one or more synchronization signal blocks (SSBs) and random access configuration information. In some examples, the random access configuration information may be transmitted in and / or indicated by system information (e.g., in one or more system information blocks (SIBs) ) and / or an SSB, such as for contention-based random access (CBRA) . Additionally, or alternatively, the random access configuration information may be transmitted in an RRC message and / or a physical downlink control channel (PDCCH) order message that triggers a RACH procedure, such as for contention-free random access (CFRA) . The random access configuration information may include one or more parameters to be used in the random access procedure, such as one or more parameters for transmitting a random access message (RAM) and / or one or more parameters for receiving a random access response (RAR) .
[0088] As shown by reference number 410, the UE 120 may transmit a RAM, which may include a preamble (sometimes referred to as a random access preamble, a PRACH preamble, or a RAM preamble) . The message that includes the preamble may be referred to as a “message 1, ” “msg1, ” “MSG1, ” a “first message, ” or an “initial message” in a four-step random access procedure. The random access message may include a random access preamble identifier.
[0089] As shown by reference number 415, the network node 110 may transmit an RAR as a reply to the preamble. The message that includes the RAR may be referred to as “message 2, ” “msg2, ” “MSG2, ” or a “second message” in a four-step random access procedure. In some examples, the RAR may indicate the detected random access preamble identifier (e.g., received from the UE 120 in msg1) . Additionally, or alternatively, the RAR may indicate a resource allocation to be used by the UE 120 to transmit message 3 (msg3) .
[0090] In some examples, as part of the second step of the four-step random access procedure, the network node 110 may transmit a PDCCH communication for the RAR. The PDCCH communication may schedule a physical downlink shared channel (PDSCH) communication that includes the RAR. For example, the PDCCH communication may indicate a resource allocation for the PDSCH communication. Also as part of the second step of the four-step random access procedure, the network node 110 may transmit the PDSCH communication for the RAR, as scheduled by the PDCCH communication. The RAR may be included in a MAC protocol data unit (PDU) of the PDSCH communication.
[0091] As shown by reference number 420, the UE 120 may transmit an RRC connection request message. The RRC connection request message may be referred to as “message 3, ” “msg3, ” “MSG3, ” or a “third message” of a four-step random access procedure. In some examples, the RRC connection request may include a UE identifier, uplink control information (UCI) , and / or a physical uplink shared channel (PUSCH) communication (e.g., an RRC connection request) .
[0092] As shown by reference number 425, the network node 110 may transmit an RRC connection setup message. The RRC connection setup message may be referred to as “message 4, ” “msg4, ” “MSG4, ” or a “fourth message” of a four-step random access procedure. In some examples, the RRC connection setup message may include the detected UE identifier, a timing advance value, and / or contention resolution information. As shown by reference number 430, if the UE 120 successfully receives the RRC connection setup message, the UE 120 may transmit a hybrid automatic repeat request (HARQ) acknowledgment (ACK) .
[0093] As indicated above, Fig. 4 is provided as an example. Other examples may differ from what is described with regard to Fig. 4.
[0094] In some examples, a network node may serve different UEs of different categories and / or different UEs that support different capabilities. For example, the network node may serve a first category of UEs that have a less advanced capability (e.g., a lower capability and / or a reduced capability) and a second category of UEs that have a more advanced capability (e.g., a higher capability) . A UE of the first category may have a reduced feature set compared to UEs of the second category, and may be referred to as a RedCap UE, a low tier UE, and / or an NR-Lite UE, among other examples. A UE of the first category may be, for example, an MTC UE, an eMTC UE, and / or an IoT UE, as described above in connection with Fig. 1. A UE of the second category may have an advanced feature set compared to UEs of the second category, and may be referred to as a baseline UE, a high tier UE, an NR UE, and / or a premium UE, among other examples. In some examples, a UE of the first category has capabilities that satisfy requirements of a first (earlier) wireless communication standard but not a second (later) wireless communication standard, while a UE of the second category has capabilities that satisfy requirements of the second (later) wireless communication standard (and also the first wireless communication standard, in some cases) .
[0095] For example, UEs of the first category may support a lower maximum MCS than UEs of the second category (e.g., quadrature phase shift keying (QPSK) or the like as compared to 256-quadrature amplitude modulation (QAM) or the like) , may support a lower maximum transmit power than UEs of the second category, may have a less advanced beamforming capability than UEs of the second category (e.g., may not be capable of forming as many beams as UEs of the second category) , may require a longer processing time than UEs of the second category, may include less hardware than UEs of the second category (e.g., fewer antennas, fewer transmit antennas, and / or fewer receive antennas) , and / or may not be capable of communicating on as wide of a maximum bandwidth part as UEs of the second category, among other examples. Additionally, or alternatively, UEs of the second category may be capable of communicating using a shortened transmission time interval (TTI) (e.g., a slot length of 1 ms or less, 0.5 ms, 0.25 ms, 0.125 ms, 0.0625 ms, or the like, depending on a sub-carrier spacing) , and UEs of the first category may not be capable of communicating using the shortened TTI.
[0096] Fig. 5 is a diagram illustrating an example 500 of a bandwidth part resource allocation, in accordance with the present disclosure.
[0097] As shown in Fig. 5, a communication system may configure a set of resources of a carrier. For example, a network node (not shown) may configure a carrier bandwidth (BW) of 100 megahertz (MHz) and a non-RedCap channel bandwidth of 100 MHz. In other words, non-RedCap UEs may be configured with a channel bandwidth that covers the whole carrier bandwidth. In contrast, the network node may configure a RedCap channel bandwidth, for RedCap UEs, of 20 MHz. Within the carrier, the network node may configure a set of BWPs. For example, the network node may configure a first RedCap BWP (BWP1) 502, a second RedCap BWP (BWP2) 504, a non-RedCap BWP (BWP3) 506, and a BWP for both RedCap and non-RedCap UEs (e.g., an initial BWP) 508. In this case, BWP1 502 and BWP3 506 are configured without ROs, but BWP2 504 and the initial BWP 508 are configured with ROs. When a UE (e.g., a RedCap UE) is operating in BWP1 502, the UE cannot fall back to the initial BWP 508 from BWP1 502 (e.g., to transmit a RACH communication) based at least in part on the initial BWP 508 being outside a channel bandwidth of the UE when the UE is operating in BWP1 502. Similarly, the UE cannot fall back to BWP2 504 (e.g., to transmit a RACH communication) , even though BWP2 504 is within the channel bandwidth for RedCap UEs, based at least in part on BWP2 504 not being configured as the initial BWP. In contrast, non-RedCap UEs operating in BWP3 506 can fall back to the initial BWP 508 based at least in part on non-RedCap UEs having a non-RedCap channel bandwidth that includes the initial BWP 508.
[0098] As indicated above, Fig. 5 is provided as an example. Other examples may differ from what is described with respect to Fig. 5.
[0099] In some communications systems, a channel bandwidth may be divided into a set of BWPs on which different UEs can communicate. A network node can configure different BWPs with different characteristics, such as configuring a BWP as an initial BWP (e.g., a BWP on which UEs can obtain initial access) or a non-initial BWP (e.g., a BWP to which a UE can transfer after obtaining initial access) . Additionally, or alternatively, the network node can configure some BWPs with ROs for performing RACH procedures and other BWPs without ROs. A RedCap UE, which may be configured with a channel bandwidth that is less than a carrier bandwidth, may operate in a connected mode on an RRC-dedicated non-initial uplink BWP that is configured without ROs, which may be set as a first active uplink BWP.
[0100] When a RedCap UE attempts to initiate a PRACH procedure and an initial uplink BWP for RedCap UEs is configured within a channel bandwidth of the UE (e.g., when the UE is operating on the non-initial uplink BWP configured without PRACH occasions) , the UE can autonomously switch to the initial uplink BWP to access ROs of the initial uplink BWP. The UE may use the ROs of the initial uplink BWP for a PRACH procedure (e.g., to transmit a RACH message) . In contrast, when the initial uplink BWP for RedCap UEs is not configured or is not within a channel bandwidth of the UE, the UE cannot switch to the initial uplink BWP. As a result, the UE may fail to initiate or complete a PRACH procedure, which may result in an RLF, a beam failure, an OOS state, a failure to receive or transmit data, or a scheduling request failure. Accordingly, the UE may re-initiate acquisition and cell selection, which may result in a communication delay and / or utilization of excess network resources for signaling overhead associated with the acquisition and cell selection procedure.
[0101] Some aspects described herein enable RACH triggered autonomous BWP switching to non-initial BWPs to access ROs. For example, when the UE is to initiate a PRACH procedure (e.g., transmit a RACH communication) in a non-initial BWP that is not configured with ROs, the UE may switch to a configured non-initial BWP that is configured with ROs (e.g., rather than attempting and failing to switch to an initial BWP that is outside a channel bandwidth or that is not configured) . Additionally, or alternatively, the UE may autonomously update a channel bandwidth and switch to an initial BWP (e.g., that was otherwise outside of the channel bandwidth of the UE) . In this way, the UE ensures that the UE can access ROs for performing a RACH procedure. Based at least in part on enabling autonomous BWP switching and / or channel bandwidth modification, the UE avoids triggering an acquisition and cell selection procedure, thereby avoiding dropped communication, communication delay, and / or utilization of excess network resources for signaling overhead.
[0102] Figs. 6A-6C are diagrams illustrating an example 600 associated with random access channel triggered bandwidth part switching, in accordance with the present disclosure. As shown in Fig. 6A, example 600 includes communication between a network node 110 and a UE 120. In some aspects, the UE 120 may be a RedCap UE. Although some aspects are described in terms of RedCap UEs, it is contemplated that aspects described herein may apply to other types of UEs with configured channel bandwidths.
[0103] As further shown in Fig. 6A, and by reference number 602, the network node 110 may configure communications for the UE 120. For example, the UE 120 may receive signaling from the network node 110 identifying a communication configuration. In some aspects, the UE 120 may receive information identifying a configuration of a channel bandwidth. For example, the network node 110 may transmit information identifying a set of non-active dedicated BWPs to which the UE 120 can transition from a dedicated BWP. In this case, the network node 110 may include, in a configuration message, a parameter ded_UL_BWPs_with_RO {} to identify the non-dedicated BWPs that have ROs that the UE 120 can use for a PRACH procedure. Additionally, or alternatively, the network node 110 may identify one or more parameters associated with the non-dedicated BWPs, such as a bandwidth part identifier (e.g., BWP_ID with a value corresponding to an uplink bandwidth part identifier of, for example, a combined uplink and downlink bandwidth part) . Additionally, or alternatively, the UE 120 may be configured with a number of feature combination preambles for a BWP (e.g., Num_Feature_Combination_Preambles_RedCap with a value corresponding to a number of preambles per SSB (numberOfPreambles PerSSB-ForThisPartition-R17) if another parameter FeatureCombinationPreambles-r17 is configured with a FeatureCombination-r17 and with RedCap-r17 set to true or else with a value of 0) . Additionally, or alternatively, the UE 120 may be configured with a number of legacy preambles (e.g., a parameter Num_Legacy_Preambles with a value that corresponds to a parameter totalNumberOfRA-Preambles of a RACH-ConfigCommon element) . Additionally, or alternatively, the UE 120 may be configured with a parameter indicating whether CFRA is configured (e.g., a parameter Is_CFRA_Configured with a value that corresponds to whether CFRA is marked in a RACH-ConfigDedicated element) . Additionally, or alternatively, the UE 120 may be configured with a parameter indicating whether a BWP is a default BWP (e.g., a parameter Is_Default_BWP with a value that corresponds to whether a downlink BWP with the same identifier as the uplink BWP is marked as a defaultDownlinkBWP-ID in a configuration element) .
[0104] In some aspects, the network node 110 may configure a priority to a BWP. For example, when the network node 110 configures non-active dedicated uplink (UL) BWPs in connection with the information element ded_UL_BWPs_with_RO {} , the network node 110 may assign priority values to different BWPs (e.g., indicating a prioritization with which the UE 120 is to transition to the non-active dedicated UL BWPs) . Additionally, or alternatively, UE 120 may use a rule or a static configuration (e.g., in a standard or specification) to select between a plurality of non-active dedicated UL BWPs. For example, the UE 120 may use a rule in which the UE 120 prioritizes BWPs based at least in part on an identifier of a default BWP, whether CBRA or CFRA is configured in a BWP, a proximity of RACH resources in a time domain (e.g., on which BWP will the UE 120 next have an opportunity to transmit a RACH communication) , or a RACH configuration parameter (e.g., a number of preambles configured for RACH, a maximum number of RACH retransmission opportunities, a power ramping step value, etc. ) , among other examples.
[0105] Other parameters that the network node 110 may configure may include a transmit off power, a transmit on / off time mask, an error vector magnitude parameter, a carrier leakage parameter, an in-band emission (IBE) parameter, a phase continuity configuration, an out-of-band configuration, a spurious emission metric, a transmit intermodulation parameter, a reference sensitivity parameter, a maximum input level parameter, an adjacent channel selectivity parameter, an in-band-blocking (IBB) criterion, an out-of-band (OOB) criterion, a narrow-band blocking criterion, a spurious response metric, or an intermodulation characteristic, among other examples. In some aspects, the network node 110 may use a system information message (e.g., a SIB) , downlink control information (DCI) , a MAC control element (CE) (MAC-CE) , or dedicated RRC signaling to convey information indicating the non-active dedicated UL BWPs, a prioritization thereof, a configuration, or a rule for determining a prioritization.
[0106] As an example, as shown in Fig. 6B, the network node 110 may configure a cell bandwidth of greater than 20 MHz. The network node 110 may configure a UE-specific channel bandwidth for the UE 120 of 20 MHz (e.g., a channel bandwidth less than the cell bandwidth) . The network node 110 may configure a set of BWPs within the cell bandwidth. For example, within the UE-specific channel bandwidth, the network node 110 may configure a first BWP (BWP1) 680, a second BWP (BWP2) 682, and a third BWP (BWP3) 684. Outside of the UE-specific channel bandwidth, the network node 110 may configure an initial BWP 686 for RedCap UEs and an initial BWP 688 for non-RedCap UEs. Each of the BWPs may be a downlink and uplink BWP, in some aspects. BWP1 680 may be an active BWP for the UE 120 (e.g., in which the UE is operating in a connected mode) and may be configured without ROs, but with a non-cell defining (NCD) -SSB in a downlink BWP component of BWP1 680. In contrast, BWP2 682 and BWP3 684 may be configured as non-active dedicated BWPs that include ROs and NCD-SSBs. The initial BWP 686 for RedCap UEs may be configured with ROs and the initial BWP 688 for non-RedCap UEs may be configured with ROs and with a control resource set (CORSET) 0 and a cell defining (CD) -SSB. Although some aspects are described in terms of the example configuration of Fig. 6B, other configurations are contemplated.
[0107] In some aspects, the network node 110 may configure the UE 120 with a channel bandwidth. For example, the network node 110 may configure the UE 120 with a first channel bandwidth that covers an active BWP and one or more non-active dedicated BWPs. Additionally, or alternatively, when the UE 120 does not support being configured with a plurality of BWPs, the network node 110 may configure the UE 120 with a second channel bandwidth that the UE 120 can adopt to transition to a second BWP. For example, the network node 110 may configure the UE 120 with a second channel bandwidth that covers a RedCap initial BWP of the UE 120. In this case, as described herein, the UE 120 may autonomously switch to the second channel bandwidth to access an RO of the RedCap initial BWP. In some aspects, the network node 110 may convey information identifying a first or second channel bandwidth using a system information message, DCI, a MAC-CE, or dedicated RRC signaling.
[0108] Returning to Fig. 6A, as shown by reference number 604, the UE 120 and the network node 110 may communicate on a first BWP. For example, based at least in part on the network node 110 configuring a cell, the UE 120 may transmit and / or receive on the BWP1 (e.g., a non-initial BWP without ROs configured) . In some aspects, during communication on the first BWP, the UE 120 may determine to initiate a PRACH procedure. For example, the UE 120 may detect a communication issue, such as a poor connection or a lack of resources on the first BWP.
[0109] As further shown in Fig. 6A, and by reference number 606, the UE 120 may transition from the first BWP to a second BWP. For example, the UE 120 may determine to transition to the second BWP to access an RO that is configured on the second BWP (e.g., when ROs are not configured on the first BWP) . In some aspects, the UE 120 may transition to a non-dedicated BWP as the second BWP. For example, when the UE 120 is configured with a set of non-active dedicated BWPs, which are configured within a UE-specific channel bandwidth of the UE (e.g., a bandwidth of the UE when the UE is operating on an active BWP) , the UE 120 may select one of the non-active BWPs as the second BWP to which to transition. In some aspects, the UE 120 may select a non-dedicated BWP based at least in part on a prioritization. For example, when the UE 120 receives (e.g., via dedicated RRC signaling or another signaling pathway) a prioritization of non-active dedicated BWPs, the UE 120 may select a BWP based at least in part on the prioritization. Additionally, or alternatively, the UE 120 may select the BWP based at least in part on a static configuration or rule (e.g., that is signaled by the network node 110 or defined in a specification or standard) , as described above. For example, the UE 120 may select the BWP based at least in part on a BWP identifier, whether CBRA or CFRA is configured, or other factors, as described above.
[0110] In some aspects, the UE 120 may follow an autonomous procedure for switching BWPs. For example, the UE 120 may select an uplink BWP with a highest priority for transmitting RACH and may switch the active uplink and downlink BWP identifier to the selected uplink BWP (and a corresponding downlink BWP) . In this case, the UE 120 may attempt to transmit a RACH communication (e.g., RACH MSG1) on an RO tagged to an NCD_SSB to initiate a PRACH procedure. In some aspects, when the PRACH procedure fails, the UE 120 may attempt one or more retransmissions. For example, the UE 120 may attempt to retransmit a RACH communication on the selected BWP for a threshold quantity of instances. After a maximum quantity of retransmission attempts is reached, the UE 120 may transition to an out-of-synchronization (OOS) state (and may attempt re-acquisition and initial access) . Additionally, or alternatively, the UE 120 switch to a next dedicated non-active BWP in a priority order and attempt to transmit the RACH communication on the next dedicated non-active BWP (and may continue to attempt to transmit or retransmit the RACH communication until all dedicated non-active BWPs have been tried before transitioning to the OOS state) .
[0111] In some aspects, the UE 120 may autonomously change a UE bandwidth to transition from a first BWP to a second BWP. For example, when the UE 120 does not support a plurality of configured BWPs (e.g., an active BWP and a set of non-active BWPs, as described above) , the UE 120 may flexibly select a different channel bandwidth. In this case, the UE 120 may adjust the channel bandwidth such that a new channel bandwidth of the UE 120 covers a RedCap initial BWP. For example, as shown in Fig. 6C, the UE 120 is configured with a first channel bandwidth that covers a BWP1 690, which does not include an RO. When the UE 120 determines to transmit a RACH communication, the UE 120 may autonomously switch to a second channel bandwidth that covers the RedCap initial BWP 692, which includes an RO. In this case, the UE 120 transitions to the RedCap initial BWP 692 as a second BWP with which to use an RO to transmit a RACH communication. For example, the UE 120 may use a second bandwidth, configured by the network node 110 as described above, to access the RedCap initial BWP 692 and transmit the RACH communication. In this case, the second bandwidth may cover an entirety of a channel bandwidth or only a subset of a channel bandwidth (e.g., a subset that includes the RedCap initial BWP 692) .
[0112] As further shown in Fig. 6A, and by reference number 608, the UE 120 and the network node 110 may communicate on a second BWP. For example, the UE 120 may transmit a RACH communication on a second BWP, which may be a configured dedicated BWP or an initial access BWP. Additionally, or alternatively, the UE 120 may receive one or more RACH response communications on the second BWP.
[0113] As indicated above, Figs. 6A-6C are provided as examples. Other examples may differ from what is described with respect to Figs. 6A-6C.
[0114] Fig. 7 is a diagram illustrating an example process 700 performed, for example, at a UE or an apparatus of a UE, in accordance with the present disclosure. Example process 700 is an example where the apparatus or the UE (e.g., UE 120) performs operations associated with RACH triggered BWP switching.
[0115] As shown in Fig. 7, in some aspects, process 700 may include communicating, with a network node, in a first bandwidth part, wherein the first bandwidth part is a non-initial bandwidth part configured without a first physical RACH occasion (block 710) . For example, the UE (e.g., using reception component 1102, transmission component 1104, and / or communication manager 1106, depicted in Fig. 11) may communicate, with a network node, in a first bandwidth part, wherein the first bandwidth part is a non-initial bandwidth part configured without a first physical RACH occasion, as described above.
[0116] As further shown in Fig. 7, in some aspects, process 700 may include transitioning, from the first bandwidth part to a second bandwidth part, to access a second physical RACH occasion of the second bandwidth part, wherein the second bandwidth part is another non-initial bandwidth part (block 720) . For example, the UE (e.g., using communication manager 1106, depicted in Fig. 11) may transition, from the first bandwidth part to a second bandwidth part, to access a second physical RACH occasion of the second bandwidth part, wherein the second bandwidth part is another non-initial bandwidth part, as described above.
[0117] As further shown in Fig. 7, in some aspects, process 700 may include transmitting a RACH communication in the second bandwidth part using the second physical RACH occasion of the second bandwidth part (block 730) . For example, the UE (e.g., using transmission component 1104 and / or communication manager 1106, depicted in Fig. 11) may transmit a RACH communication in the second bandwidth part using the second physical RACH occasion of the second bandwidth part, as described above.
[0118] Process 700 may include additional aspects, such as any single aspect or any combination of aspects described below and / or in connection with one or more other processes described elsewhere herein.
[0119] In a first aspect, the UE is configured, in a data structure, with information identifying a set of non-active dedicated bandwidth parts within a channel bandwidth of the UE in the first bandwidth part, and the information includes at least one of a bandwidth part identifier parameter, a feature combination preamble parameter, a legacy preamble parameter, a contention-free random access parameter, or a bandwidth part type parameter.
[0120] In a second aspect, alone or in combination with the first aspect, transitioning from the first bandwidth part to the second bandwidth part comprises selecting the second bandwidth part from the set of non-active dedicated bandwidth parts based at least in part on the information.
[0121] In a third aspect, alone or in combination with one or more of the first and second aspects, the second bandwidth part is associated with a particular priority value, and the particular priority value is based at least in part on a configuration or a static rule.
[0122] In a fourth aspect, alone or in combination with one or more of the first through third aspects, transitioning from the first bandwidth part to the second bandwidth part comprises selecting the second bandwidth part from a set of non-active dedicated bandwidth parts based at least in part on the particular priority value.
[0123] In a fifth aspect, alone or in combination with one or more of the first through fourth aspects, process 700 includes receiving signaling identifying the configuration of the particular priority value, wherein the signaling includes at least one of a system information message, a downlink control information message, a MAC CE message, or a radio resource control message.
[0124] In a sixth aspect, alone or in combination with one or more of the first through fifth aspects, the static rule is based at least in part on at least one of a default bandwidth part parameter, a contention based random access parameter, a contention free random access parameter, a RACH resource location parameter, a RACH configuration parameter, or a transmit power parameter.
[0125] In a seventh aspect, alone or in combination with one or more of the first through sixth aspects, process 700 includes determining a RACH procedure failure on the second bandwidth part, and transitioning to an out-of-service state.
[0126] In an eighth aspect, alone or in combination with one or more of the first through seventh aspects, process 700 includes determining a RACH procedure failure on the second bandwidth part, transitioning to a third bandwidth part within a channel bandwidth of the UE in the second bandwidth part, and transmitting another RACH communication on the third bandwidth part.
[0127] Although Fig. 7 shows example blocks of process 700, in some aspects, process 700 may include additional blocks, fewer blocks, different blocks, or differently arranged blocks than those depicted in Fig. 7. Additionally, or alternatively, two or more of the blocks of process 700 may be performed in parallel.
[0128] Fig. 8 is a diagram illustrating an example process 800 performed, for example, at a UE or an apparatus of a UE, in accordance with the present disclosure. Example process 800 is an example where the apparatus or the UE (e.g., UE 120) performs operations associated with RACH triggered BWP switching.
[0129] As shown in Fig. 8, in some aspects, process 800 may include communicating, with a network node, in a first bandwidth part, wherein the first bandwidth part is a non-initial bandwidth part configured without a first physical RACH occasion (block 810) . For example, the UE (e.g., using reception component 1102, transmission component 1104, and / or communication manager 1106, depicted in Fig. 11) may communicate, with a network node, in a first bandwidth part, wherein the first bandwidth part is a non-initial bandwidth part configured without a first physical RACH occasion, as described above.
[0130] As further shown in Fig. 8, in some aspects, process 800 may include transitioning, from the first bandwidth part to a second bandwidth part, to access a second physical RACH occasion of the second bandwidth part, wherein the second bandwidth part is outside a channel bandwidth of the UE in the first bandwidth part, and wherein the second bandwidth part is an initial bandwidth part (block 820) . For example, the UE (e.g., using communication manager 1106, depicted in Fig. 11) may transition, from the first bandwidth part to a second bandwidth part, to access a second physical RACH occasion of the second bandwidth part, wherein the second bandwidth part is outside a channel bandwidth of the UE in the first bandwidth part, and wherein the second bandwidth part is an initial bandwidth part, as described above.
[0131] As further shown in Fig. 8, in some aspects, process 800 may include transmitting a RACH communication in the second bandwidth part using the second physical RACH occasion of the second bandwidth part (block 830) . For example, the UE (e.g., using transmission component 1104 and / or communication manager 1106, depicted in Fig. 11) may transmit a RACH communication in the second bandwidth part using the second physical RACH occasion of the second bandwidth part, as described above.
[0132] Process 800 may include additional aspects, such as any single aspect or any combination of aspects described below and / or in connection with one or more other processes described elsewhere herein.
[0133] In a first aspect, the UE is configured to update the channel bandwidth in connection with transitioning to the second bandwidth part.
[0134] In a second aspect, alone or in combination with the first aspect, the UE is configured to update the channel bandwidth such that the channel bandwidth includes the second bandwidth part.
[0135] In a third aspect, alone or in combination with one or more of the first and second aspects, a new channel bandwidth for communication on the second bandwidth part is equal to the second bandwidth part.
[0136] In a fourth aspect, alone or in combination with one or more of the first through third aspects, UE is configured to update the channel bandwidth based at least in part on a value signaled via network or a statically pre-configured value.
[0137] In a fifth aspect, alone or in combination with one or more of the first through fourth aspects, UE is configured to set a parameter in connection with updating the channel bandwidth for the second bandwidth part, the parameter being associated with at least one of a maximum output power, a maximum output power reduction, a minimum output power, a transmit off power, a transmit on / off time mask, an error vector magnitude, a carrier leakage, an in-band emission, a phase continuity configuration, an out of band configuration, a spurious emission metric, or a transmit intermodulation.
[0138] In a sixth aspect, alone or in combination with one or more of the first through fifth aspects, UE is configured to set a parameter based at least in part on the channel bandwidth when operating in the second bandwidth part, wherein the parameter is associated with at least one of a reference sensitivity, a maximum input level, an adjacent channel selectivity, an in-band blocking criterion, an out-of-band blocking criterion, a narrow-band blocking criterion, a spurious response metric, or an intermodulation characteristic.
[0139] Although Fig. 8 shows example blocks of process 800, in some aspects, process 800 may include additional blocks, fewer blocks, different blocks, or differently arranged blocks than those depicted in Fig. 8. Additionally, or alternatively, two or more of the blocks of process 800 may be performed in parallel.
[0140] Fig. 9 is a diagram illustrating an example process 900 performed, for example, at a network node or an apparatus of a network node, in accordance with the present disclosure. Example process 900 is an example where the apparatus or the network node (e.g., network node 110) performs operations associated with RACH triggered BWP switching.
[0141] As shown in Fig. 9, in some aspects, process 900 may include communicating, with a UE, in a first bandwidth part, wherein the first bandwidth part is a non-initial bandwidth part configured without a first physical RACH occasion (block 910) . For example, the network node (e.g., using reception component 1202, transmission component 1204, and / or communication manager 1206, depicted in Fig. 12) may communicate, with a UE, in a first bandwidth part, wherein the first bandwidth part is a non-initial bandwidth part configured without a first physical RACH occasion, as described above.
[0142] As further shown in Fig. 9, in some aspects, process 900 may include receiving a RACH communication in a second bandwidth part using a second physical RACH occasion of a second bandwidth part, wherein the second bandwidth part is another non-initial bandwidth part (block 920) . For example, the network node (e.g., using reception component 1202 and / or communication manager 1206, depicted in Fig. 12) may receive a RACH communication in a second bandwidth part using a second physical RACH occasion of a second bandwidth part, wherein the second bandwidth part is another non-initial bandwidth part, as described above.
[0143] Process 900 may include additional aspects, such as any single aspect or any combination of aspects described below and / or in connection with one or more other processes described elsewhere herein.
[0144] In a first aspect, process 900 includes configuring the UE with information identifying a set of non-active dedicated bandwidth parts within a channel bandwidth of the UE in the first bandwidth part, and the information includes at least one of a bandwidth part identifier parameter, a feature combination preamble parameter, a legacy preamble parameter, a contention-free random access parameter, or a bandwidth part type parameter.
[0145] In a second aspect, alone or in combination with the first aspect, the second bandwidth part is associated with a particular priority value, and the particular priority value is based at least in part on a configuration or a static rule.
[0146] In a third aspect, alone or in combination with one or more of the first and second aspects, process 900 includes transmitting signaling identifying the configuration of the particular priority value, wherein the signaling includes at least one of a system information message, a downlink control information message, a MAC-CE message, or a radio resource control message.
[0147] In a fourth aspect, alone or in combination with one or more of the first through third aspects, the static rule is based at least in part on at least one of a default bandwidth part parameter, a contention based random access parameter, a contention free random access parameter, a RACH resource location parameter, a RACH configuration parameter, or a transmit power parameter.
[0148] Although Fig. 9 shows example blocks of process 900, in some aspects, process 900 may include additional blocks, fewer blocks, different blocks, or differently arranged blocks than those depicted in Fig. 9. Additionally, or alternatively, two or more of the blocks of process 900 may be performed in parallel.
[0149] Fig. 10 is a diagram illustrating an example process 1000 performed, for example, at a network node or an apparatus of a network node, in accordance with the present disclosure. Example process 1000 is an example where the apparatus or the network node (e.g., network node 110) performs operations associated with RACH triggered BWP switching.
[0150] As shown in Fig. 10, in some aspects, process 1000 may include communicating, with a UE, in a first bandwidth part, wherein the first bandwidth part is a non-initial bandwidth part configured without a first physical RACH occasion (block 1010) . For example, the network node (e.g., using reception component 1202, transmission component 1204, and / or communication manager 1206, depicted in Fig. 12) may communicate, with a UE, in a first bandwidth part, wherein the first bandwidth part is a non-initial bandwidth part configured without a first physical RACH occasion, as described above.
[0151] As further shown in Fig. 10, in some aspects, process 1000 may include receiving a RACH communication in a second bandwidth part using a second physical RACH occasion of the second bandwidth part, wherein the second bandwidth part is outside a channel bandwidth of the UE in the first bandwidth part, and wherein the second bandwidth part is an initial bandwidth part (block 1020) . For example, the network node (e.g., using reception component 1202 and / or communication manager 1206, depicted in Fig. 12) may receive a RACH communication in a second bandwidth part using a second physical RACH occasion of the second bandwidth part, wherein the second bandwidth part is outside a channel bandwidth of the UE in the first bandwidth part, and wherein the second bandwidth part is an initial bandwidth part, as described above.
[0152] Process 1000 may include additional aspects, such as any single aspect or any combination of aspects described below and / or in connection with one or more other processes described elsewhere herein.
[0153] In a first aspect, a new channel bandwidth for communication on the second bandwidth part is equal to the second bandwidth part.
[0154] Although Fig. 10 shows example blocks of process 1000, in some aspects, process 1000 may include additional blocks, fewer blocks, different blocks, or differently arranged blocks than those depicted in Fig. 10. Additionally, or alternatively, two or more of the blocks of process 1000 may be performed in parallel.
[0155] Fig. 11 is a diagram of an example apparatus 1100 for wireless communication, in accordance with the present disclosure. The apparatus 1100 may be a UE, or a UE may include the apparatus 1100. In some aspects, the apparatus 1100 includes a reception component 1102, a transmission component 1104, and / or a communication manager 1106, which may be in communication with one another (for example, via one or more buses and / or one or more other components) . In some aspects, the communication manager 1106 is the communication manager 140 described in connection with Fig. 1. As shown, the apparatus 1100 may communicate with another apparatus 1108, such as a UE or a network node (such as a CU, a DU, an RU, or a base station) , using the reception component 1102 and the transmission component 1104.
[0156] In some aspects, the apparatus 1100 may be configured to perform one or more operations described herein in connection with Figs. 6A-6C. Additionally, or alternatively, the apparatus 1100 may be configured to perform one or more processes described herein, such as process 700 of Fig. 7, process 800 of Fig. 8, or a combination thereof. In some aspects, the apparatus 1100 and / or one or more components shown in Fig. 11 may include one or more components of the UE described in connection with Fig. 2. Additionally, or alternatively, one or more components shown in Fig. 11 may be implemented within one or more components described in connection with Fig. 2. Additionally, or alternatively, one or more components of the set of components may be implemented at least in part as software stored in one or more memories. 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 one or more controllers or one or more processors to perform the functions or operations of the component.
[0157] The reception component 1102 may receive communications, such as reference signals, control information, data communications, or a combination thereof, from the apparatus 1108. The reception component 1102 may provide received communications to one or more other components of the apparatus 1100. In some aspects, the reception component 1102 may perform signal processing on the received communications (such as filtering, amplification, demodulation, analog-to-digital conversion, demultiplexing, deinterleaving, de-mapping, equalization, interference cancellation, or decoding, among other examples) , and may provide the processed signals to the one or more other components of the apparatus 1100. In some aspects, the reception component 1102 may include one or more antennas, one or more modems, one or more demodulators, one or more MIMO detectors, one or more receive processors, one or more controllers / processors, one or more memories, or a combination thereof, of the UE described in connection with Fig. 2.
[0158] The transmission component 1104 may transmit communications, such as reference signals, control information, data communications, or a combination thereof, to the apparatus 1108. In some aspects, one or more other components of the apparatus 1100 may generate communications and may provide the generated communications to the transmission component 1104 for transmission to the apparatus 1108. In some aspects, the transmission component 1104 may perform signal processing on the generated communications (such as filtering, amplification, modulation, digital-to-analog conversion, multiplexing, interleaving, mapping, or encoding, among other examples) , and may transmit the processed signals to the apparatus 1108. In some aspects, the transmission component 1104 may include one or more antennas, one or more modems, one or more modulators, one or more transmit MIMO processors, one or more transmit processors, one or more controllers / processors, one or more memories, or a combination thereof, of the UE described in connection with Fig. 2. In some aspects, the transmission component 1104 may be co-located with the reception component 1102 in one or more transceivers.
[0159] The communication manager 1106 may support operations of the reception component 1102 and / or the transmission component 1104. For example, the communication manager 1106 may receive information associated with configuring reception of communications by the reception component 1102 and / or transmission of communications by the transmission component 1104. Additionally, or alternatively, the communication manager 1106 may generate and / or provide control information to the reception component 1102 and / or the transmission component 1104 to control reception and / or transmission of communications.
[0160] The reception component 1102 and / or the transmission component 1104 may communicate, with a network node, in a first bandwidth part, wherein the first bandwidth part is a non-initial bandwidth part configured without a first physical RACH occasion. The communication manager 1106 may transition, from the first bandwidth part to a second bandwidth part, to access a second physical RACH occasion of the second bandwidth part, wherein the second bandwidth part is another non-initial bandwidth part. The transmission component 1104 may transmit a RACH communication in the second bandwidth part using the second physical RACH occasion of the second bandwidth part.
[0161] The reception component 1102 may receive signaling identifying the configuration of the particular priority value wherein the signaling includes at least one of: a system information message, a downlink control information message, a MAC CE message, or a radio resource control message. The communication manager 1106 may determine a RACH procedure failure on the second bandwidth part. The communication manager 1106 may transition to an out-of-service state. The communication manager 1106 may determine a RACH procedure failure on the second bandwidth part. The communication manager 1106 may transition to a third bandwidth part within a channel bandwidth of the UE in the second bandwidth part. The transmission component 1104 may transmit another RACH communication on the third bandwidth part.
[0162] The reception component 1102 and / or the transmission component 1104 may communicate, with a network node, in a first bandwidth part, wherein the first bandwidth part is a non-initial bandwidth part configured without a first physical RACH occasion. The communication manager 1106 may transition, from the first bandwidth part to a second bandwidth part, to access a second physical RACH occasion of the second bandwidth part, wherein the second bandwidth part is outside a channel bandwidth of the UE in the first bandwidth part, and wherein the second bandwidth part is an initial bandwidth part. The transmission component 1104 may transmit a RACH communication in the second bandwidth part using the second physical RACH occasion of the second bandwidth part.
[0163] The number and arrangement of components shown in Fig. 11 are provided as an example. In practice, there may be additional components, fewer components, different components, or differently arranged components than those shown in Fig. 11. Furthermore, two or more components shown in Fig. 11 may be implemented within a single component, or a single component shown in Fig. 11 may be implemented as multiple, distributed components. Additionally, or alternatively, a set of (one or more) components shown in Fig. 11 may perform one or more functions described as being performed by another set of components shown in Fig. 11.
[0164] Fig. 12 is a diagram of an example apparatus 1200 for wireless communication, in accordance with the present disclosure. The apparatus 1200 may be a network node, or a network node may include the apparatus 1200. In some aspects, the apparatus 1200 includes a reception component 1202, a transmission component 1204, and / or a communication manager 1206, which may be in communication with one another (for example, via one or more buses and / or one or more other components) . In some aspects, the communication manager 1206 is the communication manager 150 described in connection with Fig. 1. As shown, the apparatus 1200 may communicate with another apparatus 1208, such as a UE or a network node (such as a CU, a DU, an RU, or a base station) , using the reception component 1202 and the transmission component 1204.
[0165] In some aspects, the apparatus 1200 may be configured to perform one or more operations described herein in connection with Figs. 6A-6C. Additionally, or alternatively, the apparatus 1200 may be configured to perform one or more processes described herein, such as process 900 of Fig. 9, process 1000 of Fig. 10, or a combination thereof. In some aspects, the apparatus 1200 and / or one or more components shown in Fig. 12 may include one or more components of the network node described in connection with Fig. 2. Additionally, or alternatively, one or more components shown in Fig. 12 may be implemented within one or more components described in connection with Fig. 2. Additionally, or alternatively, one or more components of the set of components may be implemented at least in part as software stored in one or more memories. 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 one or more controllers or one or more processors to perform the functions or operations of the component.
[0166] The reception component 1202 may receive communications, such as reference signals, control information, data communications, or a combination thereof, from the apparatus 1208. The reception component 1202 may provide received communications to one or more other components of the apparatus 1200. In some aspects, the reception component 1202 may perform signal processing on the received communications (such as filtering, amplification, demodulation, analog-to-digital conversion, demultiplexing, deinterleaving, de-mapping, equalization, interference cancellation, or decoding, among other examples) , and may provide the processed signals to the one or more other components of the apparatus 1200. In some aspects, the reception component 1202 may include one or more antennas, one or more modems, one or more demodulators, one or more MIMO detectors, one or more receive processors, one or more controllers / processors, one or more memories, or a combination thereof, of the network node described in connection with Fig. 2. In some aspects, the reception component 1202 and / or the transmission component 1204 may include or may be included in a network interface. The network interface may be configured to obtain and / or output signals for the apparatus 1200 via one or more communications links, such as a backhaul link, a midhaul link, and / or a fronthaul link.
[0167] The transmission component 1204 may transmit communications, such as reference signals, control information, data communications, or a combination thereof, to the apparatus 1208. In some aspects, one or more other components of the apparatus 1200 may generate communications and may provide the generated communications to the transmission component 1204 for transmission to the apparatus 1208. In some aspects, the transmission component 1204 may perform signal processing on the generated communications (such as filtering, amplification, modulation, digital-to-analog conversion, multiplexing, interleaving, mapping, or encoding, among other examples) , and may transmit the processed signals to the apparatus 1208. In some aspects, the transmission component 1204 may include one or more antennas, one or more modems, one or more modulators, one or more transmit MIMO processors, one or more transmit processors, one or more controllers / processors, one or more memories, or a combination thereof, of the network node described in connection with Fig. 2. In some aspects, the transmission component 1204 may be co-located with the reception component 1202 in one or more transceivers.
[0168] The communication manager 1206 may support operations of the reception component 1202 and / or the transmission component 1204. For example, the communication manager 1206 may receive information associated with configuring reception of communications by the reception component 1202 and / or transmission of communications by the transmission component 1204. Additionally, or alternatively, the communication manager 1206 may generate and / or provide control information to the reception component 1202 and / or the transmission component 1204 to control reception and / or transmission of communications.
[0169] The reception component 1202 and / or the transmission component 1204 may communicate, with a UE, in a first bandwidth part, wherein the first bandwidth part is a non-initial bandwidth part configured without a first physical RACH occasion. The reception component 1202 may receive a RACH communication in a second bandwidth part using a second physical RACH occasion of a second bandwidth part, wherein the second bandwidth part is another non-initial bandwidth part.
[0170] The communication manager 1206 may configure the UE with information identifying a set of non-active dedicated bandwidth parts within a channel bandwidth of the UE in the first bandwidth part. The transmission component 1204 may transmit signaling identifying the configuration of the particular priority value wherein the signaling includes at least one of: a system information message, a downlink control information message, a MAC CE message, or a radio resource control message.
[0171] The reception component 1202 and / or the transmission component 1204 may communicate, with a UE, in a first bandwidth part, wherein the first bandwidth part is a non-initial bandwidth part configured without a first physical RACH occasion. The reception component 1202 may receive a RACH communication in a second bandwidth part using a second physical RACH occasion of the second bandwidth part, wherein the second bandwidth part is outside a channel bandwidth of the UE in the first bandwidth part, and wherein the second bandwidth part is an initial bandwidth part.
[0172] The number and arrangement of components shown in Fig. 12 are provided as an example. In practice, there may be additional components, fewer components, different components, or differently arranged components than those shown in Fig. 12. Furthermore, two or more components shown in Fig. 12 may be implemented within a single component, or a single component shown in Fig. 12 may be implemented as multiple, distributed components. Additionally, or alternatively, a set of (one or more) components shown in Fig. 12 may perform one or more functions described as being performed by another set of components shown in Fig. 12.
[0173] The following provides an overview of some Aspects of the present disclosure:
[0174] Aspect 1: A method of wireless communication performed by a user equipment (UE) , comprising: communicating, with a network node, in a first bandwidth part, wherein the first bandwidth part is a non-initial bandwidth part configured without a first physical random access channel (RACH) occasion; transitioning, from the first bandwidth part to a second bandwidth part, to access a second physical RACH occasion of the second bandwidth part, wherein the second bandwidth part is another non-initial bandwidth part; and transmitting a RACH communication in the second bandwidth part using the second physical RACH occasion of the second bandwidth part.
[0175] Aspect 2: The method of Aspect 1, wherein the UE is configured, in a data structure, with information identifying a set of non-active dedicated bandwidth parts within a channel bandwidth of the UE in the first bandwidth part, and wherein the information includes at least one of: a bandwidth part identifier parameter, a feature combination preamble parameter, a legacy preamble parameter, a contention-free random access parameter, or a bandwidth part type parameter.
[0176] Aspect 3: The method of Aspect 2, wherein transitioning from the first bandwidth part to the second bandwidth part comprises: selecting the second bandwidth part from the set of non-active dedicated bandwidth parts based at least in part on the information.
[0177] Aspect 4: The method of any of Aspects 1-3, wherein the second bandwidth part is associated with a particular priority value, and wherein the particular priority value is based at least in part on a configuration or a static rule.
[0178] Aspect 5: The method of Aspect 4, wherein transitioning from the first bandwidth part to the second bandwidth part comprises: selecting the second bandwidth part from a set of non-active dedicated bandwidth parts based at least in part on the particular priority value.
[0179] Aspect 6: The method of Aspect 4, further comprising: receiving signaling identifying the configuration of the particular priority value, wherein the signaling includes at least one of: a system information message, a downlink control information message, a medium access control (MAC) control element message, or a radio resource control message.
[0180] Aspect 7: The method of Aspect 4, wherein the static rule is based at least in part on at least one of: a default bandwidth part parameter, a contention based random access parameter, a contention free random access parameter, a RACH resource location parameter, a RACH configuration parameter, or a transmit power parameter.
[0181] Aspect 8: The method of any of Aspects 1-7, further comprising: determining a RACH procedure failure on the second bandwidth part; and transitioning to an out-of-service state.
[0182] Aspect 9: The method of any of Aspects 1-8, further comprising: determining a RACH procedure failure on the second bandwidth part; transitioning to a third bandwidth part within a channel bandwidth of the UE in the second bandwidth part; and transmitting another RACH communication on the third bandwidth part.
[0183] Aspect 10: A method of wireless communication performed by a user equipment (UE) , comprising: communicating, with a network node, in a first bandwidth part, wherein the first bandwidth part is a non-initial bandwidth part configured without a first physical random access channel (RACH) occasion; transitioning, from the first bandwidth part to a second bandwidth part, to access a second physical RACH occasion of the second bandwidth part, wherein the second bandwidth part is outside a channel bandwidth of the UE in the first bandwidth part, and wherein the second bandwidth part is an initial bandwidth part; and transmitting a RACH communication in the second bandwidth part using the second physical RACH occasion of the second bandwidth part.
[0184] Aspect 11: The method of Aspect 10, wherein the UE is configured to update the channel bandwidth in connection with transitioning to the second bandwidth part.
[0185] Aspect 12: The method of any of Aspects 10-11, wherein the UE is configured to update the channel bandwidth such that the channel bandwidth includes the second bandwidth part.
[0186] Aspect 13: The method of any of Aspects 10-12, wherein a new channel bandwidth for communication on the second bandwidth part is equal to the second bandwidth part.
[0187] Aspect 14: The method of any of Aspects 10-13, wherein UE is configured to update the channel bandwidth based at least in part on a value signaled via network or a statically pre-configured value.
[0188] Aspect 15: The method of any of Aspects 10-14, wherein UE is configured to set a parameter in connection with updating the channel bandwidth for the second bandwidth part, the parameter being associated with at least one of: a maximum output power, a maximum output power reduction, a minimum output power, a transmit off power, a transmit on / off time mask, an error vector magnitude, a carrier leakage, an in-band emission, a phase continuity configuration, an out of band configuration, a spurious emission metric, or a transmit intermodulation.
[0189] Aspect 16: The method of any of Aspects 10-15, wherein UE is configured to set a parameter based at least in part on the channel bandwidth when operating in the second bandwidth part, wherein the parameter is associated with at least one of: a reference sensitivity, a maximum input level, an adjacent channel selectivity, an in-band blocking criterion, an out-of-band blocking criterion, a narrow-band blocking criterion, a spurious response metric, or an intermodulation characteristic.
[0190] Aspect 17: A method of wireless communication performed by a network node, comprising: communicating, with a user equipment (UE) , in a first bandwidth part, wherein the first bandwidth part is a non-initial bandwidth part configured without a first physical random access channel (RACH) occasion; and receiving a RACH communication in a second bandwidth part using a second physical RACH occasion of a second bandwidth part, wherein the second bandwidth part is another non-initial bandwidth part.
[0191] Aspect 18: The method of Aspect 17, further comprising: configuring the UE with information identifying a set of non-active dedicated bandwidth parts within a channel bandwidth of the UE in the first bandwidth part, and wherein the information includes at least one of: a bandwidth part identifier parameter, a feature combination preamble parameter, a legacy preamble parameter, a contention-free random access parameter, or a bandwidth part type parameter. wherein the information includes at least one of: a bandwidth part identifier parameter, a feature combination preamble parameter, a legacy preamble parameter, a contention-free random access parameter, or a bandwidth part type parameter.
[0192] Aspect 19: The method of any of Aspects 17-18, wherein the second bandwidth part is associated with a particular priority value, and wherein the particular priority value is based at least in part on a configuration or a static rule.
[0193] Aspect 20: The method of Aspect 19, further comprising: transmitting signaling identifying the configuration of the particular priority value, wherein the signaling includes at least one of: a system information message, a downlink control information message, a medium access control (MAC) control element message, or a radio resource control message.
[0194] Aspect 21: The method of Aspect 19, wherein the static rule is based at least in part on at least one of: a default bandwidth part parameter, a contention based random access parameter, a contention free random access parameter, a RACH resource location parameter, a RACH configuration parameter, or a transmit power parameter.
[0195] Aspect 22: A method of wireless communication performed by a network node, comprising: communicating, with a user equipment (UE) , in a first bandwidth part, wherein the first bandwidth part is a non-initial bandwidth part configured without a first physical random access channel (RACH) occasion; and receiving a RACH communication in a second bandwidth part using a second physical RACH occasion of the second bandwidth part, wherein the second bandwidth part is outside a channel bandwidth of the UE in the first bandwidth part, and wherein the second bandwidth part is an initial bandwidth part.
[0196] Aspect 23: The method of Aspect 22, wherein a new channel bandwidth for communication on the second bandwidth part is equal to the second bandwidth part.
[0197] Aspect 24: An apparatus for wireless communication at a device, the apparatus comprising one or more processors; one or more memories coupled with the one or more processors; and instructions stored in the one or more memories and executable by the one or more processors to cause the apparatus to perform the method of one or more of Aspects 1-23.
[0198] Aspect 25: An apparatus for wireless communication at a device, the apparatus comprising one or more memories and one or more processors coupled to the one or more memories, the one or more processors configured to cause the device to perform the method of one or more of Aspects 1-23.
[0199] Aspect 26: An apparatus for wireless communication, the apparatus comprising at least one means for performing the method of one or more of Aspects 1-23.
[0200] Aspect 27: A non-transitory computer-readable medium storing code for wireless communication, the code comprising instructions executable by one or more processors to perform the method of one or more of Aspects 1-23.
[0201] Aspect 28: 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 of one or more of Aspects 1-23.
[0202] Aspect 29: A device for wireless communication, the device comprising a processing system that includes one or more processors and one or more memories coupled with the one or more processors, the processing system configured to cause the device to perform the method of one or more of Aspects 1-23.
[0203] Aspect 30: An apparatus for wireless communication at a device, the apparatus comprising one or more memories and one or more processors coupled to the one or more memories, the one or more processors individually or collectively configured to cause the device to perform the method of one or more of Aspects 1-23.
[0204] The foregoing disclosure provides illustration and description but is not intended to be exhaustive or to limit the aspects to the precise forms disclosed. Modifications and variations may be made in light of the above disclosure or may be acquired from practice of the aspects.
[0205] As used herein, the term “component” is intended to be broadly construed as hardware and / or a combination of hardware and software. “Software” shall be construed broadly to mean instructions, instruction sets, code, code segments, program code, programs, subprograms, software modules, applications, software applications, software packages, routines, subroutines, objects, executables, threads of execution, procedures, and / or functions, among other examples, whether referred to as software, firmware, middleware, microcode, hardware description language, or otherwise. As used herein, a “processor” is implemented in hardware and / or a combination of hardware and software. It will be apparent that systems and / or methods described herein may be implemented in different forms of hardware and / or a combination of hardware and software. The actual specialized control hardware or software code used to implement these systems and / or methods is not limiting of the aspects. Thus, the operation and behavior of the systems and / or methods are described herein without reference to specific software code, since those skilled in the art will understand that software and hardware can be designed to implement the systems and / or methods based, at least in part, on the description herein.
[0206] The hardware and data processing apparatus used to implement the various illustrative logics, logical blocks, modules and circuits described in connection with the aspects disclosed herein may be implemented or performed with a general purpose single-or multi-chip processor, a digital signal processor (DSP) , an application specific integrated circuit (ASIC) , a field programmable gate array (FPGA) or other programmable logic device, discrete gate or transistor logic, discrete hardware components, or any combination thereof designed to perform the functions described herein. A general purpose processor may be a microprocessor, or any conventional processor, controller, microcontroller, or state machine. A processor also may be implemented as a combination of computing devices, for example, a combination of a DSP and a microprocessor, a plurality of microprocessors, one or more microprocessors in conjunction with a DSP core, or any other such configuration. In some aspects, particular processes and methods may be performed by circuitry that is specific to a given function.
[0207] As used herein, “satisfying a threshold” may, depending on the context, refer to a value being 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, not equal to the threshold, or the like.
[0208] Even though particular combinations of features are recited 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 recited in the claims and / or disclosed in the specification. The disclosure of various aspects includes each dependent claim in combination with every other claim in the claim set. As used herein, a phrase referring to “at least one of” a list of items refers to any combination of those items, including single members. 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 multiples of the same element (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) .
[0209] No element, act, or instruction used herein should be construed as critical or essential unless explicitly described as such. Also, as used herein, the articles “a” and “an” are intended to include one or more items and may be used interchangeably with “one or more. ” Further, as used herein, the article “the” is intended to include one or more items referenced in connection with the article “the” and may be used interchangeably with “the one or more. ” Furthermore, as used herein, the terms “set” and “group” are intended to include one or more items and may be used interchangeably with “one or more. ” Where only one item is intended, the phrase “only one” or similar language is used. Also, as used herein, the terms “has, ” “have, ” “having, ” or the like are intended to be open-ended terms that do not limit an element that they modify (e.g., an element “having” A may also have B) . Further, the phrase “based on” is intended to mean “based, at least in part, on” unless explicitly stated otherwise. Also, as used herein, the term “or” is intended to be inclusive when used in a series and may be used interchangeably with “and / or, ” unless explicitly stated otherwise (e.g., if used in combination with “either” or “only one of” ) .
Claims
1.An apparatus for wireless communication, comprising:one or more memories; andone or more processors, coupled to the one or more memories, the one or more processors individually or collectively configured to:communicate, with a network node, in a first bandwidth part, wherein the first bandwidth part is a non-initial bandwidth part configured without a first physical random access channel (RACH) occasion;transition, from the first bandwidth part to a second bandwidth part, to access a second physical RACH occasion of the second bandwidth part, wherein the second bandwidth part is another non-initial bandwidth part; andtransmit a RACH communication in the second bandwidth part using the second physical RACH occasion of the second bandwidth part.2.The apparatus of claim 1, wherein the apparatus is configured, in a data structure, with information identifying a set of non-active dedicated bandwidth parts within a channel bandwidth of the apparatus in the first bandwidth part, andwherein the information includes at least one of:a bandwidth part identifier parameter,a feature combination preamble parameter,a legacy preamble parameter,a contention-free random access parameter, ora bandwidth part type parameter.3.The apparatus of claim 2, wherein the one or more processors, to cause the apparatus to transition from the first bandwidth part to the second bandwidth part, are configured to cause the apparatus to:select the second bandwidth part from the set of non-active dedicated bandwidth parts based at least in part on the information.4.The apparatus of claim 1, wherein the second bandwidth part is associated with a particular priority value, and wherein the particular priority value is based at least in part on a configuration or a static rule.5.The apparatus of claim 4, wherein the one or more processors, to cause the apparatus to transition from the first bandwidth part to the second bandwidth part, are configured to cause the apparatus to:select the second bandwidth part from a set of non-active dedicated bandwidth parts based at least in part on the particular priority value.6.The apparatus of claim 4, wherein the one or more processors are further configured to cause the apparatus to:receive signaling identifying the configuration of the particular priority value,wherein the signaling includes at least one of:a system information message,a downlink control information message,a medium access control (MAC) control element message, ora radio resource control message.7.The apparatus of claim 4, wherein the static rule is based at least in part on at least one of:a default bandwidth part parameter,a contention based random access parameter,a contention free random access parameter,a RACH resource location parameter,a RACH configuration parameter, ora transmit power parameter.8.The apparatus of claim 1, wherein the one or more processors are further configured to cause the apparatus to:determine a RACH procedure failure on the second bandwidth part; andtransition to an out-of-service state.9.The apparatus of claim 1, wherein the one or more processors are further configured to cause the apparatus to:determine a RACH procedure failure on the second bandwidth part;transition to a third bandwidth part within a channel bandwidth of the apparatus in the second bandwidth part; andtransmit another RACH communication on the third bandwidth part.10.An apparatus for wireless communication, comprising:one or more memories; andone or more processors, coupled to the one or more memories, the one or more processors individually or collectively configured to:communicate, with a network node, in a first bandwidth part, wherein the first bandwidth part is a non-initial bandwidth part configured without a first physical random access channel (RACH) occasion;transition, from the first bandwidth part to a second bandwidth part, to access a second physical RACH occasion of the second bandwidth part, wherein the second bandwidth part is outside a channel bandwidth of the apparatus in the first bandwidth part, and wherein the second bandwidth part is an initial bandwidth part; andtransmit a RACH communication in the second bandwidth part using the second physical RACH occasion of the second bandwidth part.11.The apparatus of claim 10, wherein the apparatus is configured to update the channel bandwidth in connection with transitioning to the second bandwidth part.12.The apparatus of claim 10, wherein the apparatus is configured to update the channel bandwidth such that the channel bandwidth includes the second bandwidth part.13.The apparatus of claim 10, wherein a new channel bandwidth for communication on the second bandwidth part is equal to the second bandwidth part.14.The apparatus of claim 10, wherein apparatus is configured to update the channel bandwidth based at least in part on a value signaled via network or a statically pre-configured value.15.The apparatus of claim 10, wherein apparatus is configured to set a parameter in connection with updating the channel bandwidth for the second bandwidth part, the parameter being associated with at least one of:a maximum output power,a maximum output power reduction,a minimum output power,a transmit off power,a transmit on / off time mask,an error vector magnitude,a carrier leakage,an in-band emission,a phase continuity configuration,an out of band configuration,a spurious emission metric, ora transmit intermodulation.16.The apparatus of claim 10, wherein apparatus is configured to set a parameter based at least in part on the channel bandwidth when operating in the second bandwidth part, wherein the parameter is associated with at least one of:a reference sensitivity,a maximum input level,an adjacent channel selectivity,an in-band blocking criterion,an out-of-band blocking criterion,a narrow-band blocking criterion,a spurious response metric, oran intermodulation characteristic.17.An apparatus for wireless communication, comprising:one or more memories; andone or more processors, coupled to the one or more memories, the one or more processors individually or collectively configured to:communicate, with a user equipment (UE) , in a first bandwidth part, wherein the first bandwidth part is a non-initial bandwidth part configured without a first physical random access channel (RACH) occasion; andreceive a RACH communication in a second bandwidth part using a second physical RACH occasion of a second bandwidth part, wherein the second bandwidth part is another non-initial bandwidth part.18.The apparatus of claim 17, wherein the one or more processors are further configured to cause the apparatus to:configure the UE with information identifying a set of non-active dedicated bandwidth parts within a channel bandwidth of the UE in the first bandwidth part, andwherein the information includes at least one of:a bandwidth part identifier parameter,a feature combination preamble parameter,a legacy preamble parameter,a contention-free random access parameter, ora bandwidth part type parameter.19.The apparatus of claim 17, wherein the second bandwidth part is associated with a particular priority value, and wherein the particular priority value is based at least in part on a configuration or a static rule.20.The apparatus of claim 19, wherein the one or more processors are further configured to cause the apparatus to:transmit signaling identifying the configuration of the particular priority value,wherein the signaling includes at least one of:a system information message,a downlink control information message,a medium access control (MAC) control element message, ora radio resource control message.21.The apparatus of claim 19, wherein the static rule is based at least in part on at least one of:a default bandwidth part parameter,a contention based random access parameter,a contention free random access parameter,a RACH resource location parameter,a RACH configuration parameter, ora transmit power parameter.22.An apparatus for wireless communication, comprising:one or more memories; andone or more processors, coupled to the one or more memories, the one or more processors individually or collectively configured to:communicate, with a user equipment (UE) , in a first bandwidth part, wherein the first bandwidth part is a non-initial bandwidth part configured without a first physical random access channel (RACH) occasion; andreceive a RACH communication in a second bandwidth part using a second physical RACH occasion of the second bandwidth part, wherein the second bandwidth part is outside a channel bandwidth of the UE in the first bandwidth part, and wherein the second bandwidth part is an initial bandwidth part.23.The apparatus of claim 22, wherein a new channel bandwidth for communication on the second bandwidth part is equal to a bandwidth of the second bandwidth part.
Citation Information
Patent Citations
User equipment for obtaining a band width part for a random access, a network node, and corresponding methods in a wireless communication network
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Initial access procedure using preconfigured resources
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Techniques and apparatuses for configuring an uplink bandwidth part for a random access channel (RACH) procedure
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RACH timeline incorporating bandwidth part switch to receive a synchronization signal block
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