Resource configuration and selection for downlink small data transmission

Abstract

Aspects of the present disclosure generally relate to wireless communications. In some aspects, a user equipment (UE) may receive, from a network node, an indication that the UE is to perform a mobile termination (MT) small data transmission (SDT) (MT-SDT) operation. In response to the indication, the UE may transmit a communication to the network node using: a first uplink resource associated with a Mobile Initiation (MO) SDT (MO-SDT) configuration for use based at least in part on satisfying one or more conditions, or based at least in part on a second uplink resource associated with a random access configuration used without configuring the MO-SDT configuration for the UE, or based at least in part on not satisfying the one or more conditions or based at least in part on a second uplink resource associated with the random access configuration. Numerous other aspects are described.

Description

Technical Field

[0001] Aspects of the present disclosure relate generally to wireless communications, and to techniques and apparatus for resource configuration and selection for downlink small data transmissions. Background Art

[0002] Wireless communication systems are widely deployed to provide a variety of telecommunication services, such as telephony, video, data, messaging, and broadcasting. Typical wireless communication systems may employ multiple access technologies that can support communication with multiple users by sharing available system resources (e.g., bandwidth, transmit power, etc.). Examples of such multiple access technologies include code division multiple access (CDMA) systems, time division multiple access (TDMA) systems, frequency division multiple access (FDMA) systems, orthogonal frequency division multiple access (OFDMA) systems, single carrier frequency division multiple access (SC-FDMA) systems, time division synchronous code division multiple access (TD-SCDMA) systems, and long term evolution (LTE). LTE / LTE-Advanced is a set of enhancements to the Universal Mobile Telecommunications System (UMTS) mobile standard promulgated by the Third Generation Partnership Project (3GPP).

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

[0004] The above-mentioned multiple access technologies have been adopted in various telecommunication standards to provide a common protocol that enables different UEs to communicate at a city, country, region 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 3GPP. NR is designed to better support mobile broadband Internet access by using orthogonal frequency division multiplexing (OFDM) (CP-OFDM) with a cyclic prefix (CP) 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, and supporting beamforming, multiple input multiple output (MIMO) antenna technology and carrier aggregation to improve spectrum efficiency, reduce costs, improve services, utilize new spectrum, and better integrate with other open standards. As the demand for mobile broadband access continues to increase, further improvements in LTE, NR and other radio access technologies remain useful. Summary of the invention

[0005] Some aspects described herein relate to a method of wireless communication performed by a user equipment (UE). The method may include: receiving an indication from a network node that the UE is to perform a mobile terminated (MT) small data transmission (SDT) (MT-SDT) operation. The method may include: in response to the indication, sending a communication to the network node using: a first uplink resource associated with a mobile originated (MO) SDT (MO-SDT) configuration that is used based at least in part on satisfying one or more conditions, or a second uplink resource associated with a random access configuration that is used based at least in part on not satisfying the one or more conditions or at least in part on not configuring the MO-SDT configuration for the UE.

[0006] Some aspects described herein relate to a method of wireless communication performed by a network node. The method may include: sending an indication to a UE that the UE is to perform MT-SDT operations. The method may include: in response to the indication, receiving communications associated with the UE using: a first uplink resource associated with a MO-SDT configuration that is used based at least in part on satisfying one or more conditions, or a second uplink resource associated with a random access configuration that is used based at least in part on not satisfying the one or more conditions or at least in part on not configuring the MO-SDT configuration for the UE.

[0007] Some aspects described herein relate to a UE for wireless communication. The user equipment may include a memory and one or more processors coupled to the memory. The one or more processors may be configured to: receive an indication from a network node that the UE is to perform MT-SDT operations. The one or more processors may be configured to: in response to the indication, send a communication to the network node using: a first uplink resource associated with a MO-SDT configuration that is used based at least in part on satisfying one or more conditions, or a second uplink resource associated with a random access configuration that is used based at least in part on not satisfying the one or more conditions or at least in part on not configuring the MO-SDT configuration for the UE.

[0008] Some aspects described herein relate to a network node for wireless communication. The network node may include a memory and one or more processors coupled to the memory. The one or more processors may be configured to: send an indication to a UE that the UE will perform an MT-SDT operation. The one or more processors may be configured to: in response to the indication, receive a communication associated with the UE using: a first uplink resource associated with an MO-SDT configuration that is used based at least in part on satisfying one or more conditions, or a second uplink resource associated with a random access configuration that is used based at least in part on not satisfying the one or more conditions or at least in part on not configuring an MO-SDT configuration for the UE.

[0009] Some aspects described herein relate to a non-transitory computer-readable medium storing an instruction set for wireless communication by a UE. The instruction set, when executed by one or more processors of the UE, may cause the UE to receive an indication from a network node that the UE will perform an MT-SDT operation. The instruction set, when executed by one or more processors of the UE, may cause the UE to: in response to the indication, send a communication to the network node using: a first uplink resource associated with an MO-SDT configuration that is used based at least in part on satisfying one or more conditions, or a second uplink resource associated with a random access configuration that is used based at least in part on not satisfying the one or more conditions or at least in part on not configuring an MO-SDT configuration for the UE.

[0010] Some aspects described herein relate to a non-transitory computer-readable medium storing an instruction set for wireless communication by a network node. The instruction set, when executed by one or more processors of the network node, may cause the network node to send an indication to a UE that the UE will perform an MT-SDT operation. The instruction set, when executed by one or more processors of the network node, may cause the network node to: in response to the indication, receive communications associated with the UE using: a first uplink resource associated with an MO-SDT configuration that is used based at least in part on satisfying one or more conditions, or a second uplink resource associated with a random access configuration that is used based at least in part on not satisfying the one or more conditions or at least in part on not configuring an MO-SDT configuration for the UE.

[0011] Some aspects described herein relate to an apparatus for wireless communication. The apparatus may include means for receiving an indication from a network node that the apparatus is to perform MT-SDT operations. The apparatus may include means for sending a communication to the network node, in response to the indication, using: first uplink resources associated with a MO-SDT configuration for use based at least in part on satisfying one or more conditions, or second uplink resources associated with a random access configuration for use based at least in part on not satisfying the one or more conditions or based at least in part on not configuring the MO-SDT configuration for the apparatus.

[0012] Some aspects described herein relate to an apparatus for wireless communication. The apparatus may include means for sending an indication to a UE that the UE will perform MT-SDT operations. The apparatus may include means for receiving, in response to the indication, communications associated with the UE using: first uplink resources associated with a MO-SDT configuration for use based at least in part on satisfying one or more conditions, or second uplink resources associated with a random access configuration for use based at least in part on not satisfying the one or more conditions or at least in part on not configuring a MO-SDT configuration for the UE.

[0013] The various aspects generally include methods, apparatus, systems, computer program products, non-transitory computer-readable media, user equipment, base stations, network entities, network nodes, wireless communication devices and / or processing systems as fully described herein with reference to the drawings and description and as illustrated in the drawings and description.

[0014] The features and technical advantages of examples according to the present disclosure have been outlined quite broadly above so that the following specific embodiments may be better understood. Additional features and advantages will be described below. The disclosed concepts and specific examples may be easily used as a basis for modifying or designing other structures for achieving the same purpose of the present disclosure. Such equivalent constructions do not depart from the scope of the appended claims. The characteristics of the concepts disclosed herein, both in terms of their organization and method of operation, and the associated advantages will be better understood by considering the following description in conjunction with the accompanying drawings. Each of the figures in the accompanying drawings is provided for the purpose of illustration and description and not as a definition of limitations to the claims.

[0015] Although various aspects are described in the present disclosure by illustrating some examples, it will be understood by those skilled in the art that such aspects can be implemented in many different arrangements and scenarios. The technology described herein can be implemented using different platform types, devices, systems, shapes, sizes and / or packaging arrangements. For example, some aspects can be implemented via integrated chip implementations or other devices based on non-module components (e.g., end-user devices, vehicles, communication equipment, computing equipment, industrial equipment, retail / shopping equipment, medical equipment, and / or artificial intelligence devices). Various aspects can be implemented in chip-level components, modular components, non-modular components, non-chip-level components, device-level components and / or system-level components. The equipment incorporating the various aspects and features described may include additional components and features for implementing and practicing the various aspects claimed and described. For example, the transmission and reception of wireless signals may include one or more components (e.g., hardware components, including antennas, radio frequency (RF) chains, power amplifiers, modulators, buffers, processors, interleavers, adders and / or summers) for analog and digital purposes. The various aspects described herein are intended to be practiced in various devices, components, systems, distributed arrangements, and / or end-user devices of various sizes, shapes and configurations. BRIEF DESCRIPTION OF THE DRAWINGS

[0016] In order to fully understand the above-mentioned features of the present disclosure, a more specific description of the invention briefly summarized above can be obtained by referring to various aspects (some of which are illustrated in the accompanying drawings). However, it should be noted that the accompanying drawings only illustrate certain typical aspects of the present disclosure and are therefore not to be considered as limiting the scope thereof, as the specification may admit of other equally effective aspects. The same reference numerals in different drawings may identify the same or similar elements.

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

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

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

[0020] Figure 4 An example of a wireless network in which a UE can support additional communication modes according to the present disclosure is illustrated.

[0021] Figure 5 is a diagram illustrating an example of a two-step random access procedure associated with small data transmission (SDT) according to the present disclosure.

[0022] Figure 6is a diagram illustrating an example of a four-step random access procedure associated with SDT according to the present disclosure.

[0023] Figure 7 is a diagram illustrating an example of a Configuration Grant (CG) SDT (CG-SDT) procedure according to the present disclosure.

[0024] Figure 8 is a diagram of an example associated with resource configuration and selection for downlink small data transmission according to the present disclosure.

[0025] Fig. 9 is a diagram illustrating an example process performed, for example, by a UE according to the present disclosure.

[0026] Fig.10 is a diagram illustrating an example process, for example, performed by a network node, according to the present disclosure.

[0027] Fig.11 is a diagram of an example apparatus for wireless communications according to the present disclosure.

[0028] Fig.12 is a diagram of an example apparatus for wireless communications according to the present disclosure. DETAILED DESCRIPTION

[0029] The various aspects of the present disclosure are described more fully below with reference to the accompanying drawings. However, the present disclosure can be embodied in many different forms, and should not be interpreted as being limited to any specific structure or function presented throughout the present disclosure. On the contrary, these aspects are provided so that the present disclosure will be thorough and complete, and the scope of the present disclosure will be fully conveyed to those skilled in the art. It should be understood by those skilled in the art that the scope of the present disclosure is intended to cover any aspect of the present disclosure disclosed herein, whether it is implemented independently or in combination with any other aspect of the present disclosure. For example, any number of aspects set forth herein may be used to implement a device or practice method. In addition, the scope of the present disclosure is intended to cover such devices or methods implemented using other structures, functions, or structures and functions in addition to or different from 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 the claims.

[0030] Several aspects of telecommunication systems will now be presented with reference to various devices and techniques. These devices 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, etc. (collectively referred to as "elements"). These elements can be implemented using hardware, software, or a combination thereof. Whether these elements are implemented as hardware or software depends on the specific application and the design constraints imposed on the overall system.

[0031] Although various aspects may be described herein using terms generally associated with 5G or new radio (NR) radio access technology (RAT), various aspects of the present disclosure may be applicable to other RATs, such as 3G RAT, 4G RAT, and / or post-5G RATs (e.g., 6G).

[0032] Figure 1 1 is a diagram illustrating an example of a wireless network 100 according to the present disclosure. The wireless network 100 may be a 5G (e.g., NR) network and / or a 4G (e.g., Long Term Evolution (LTE)) network, or may include elements of a 5G (e.g., NR) network and / or elements of a 4G (e.g., Long Term Evolution (LTE)) network, etc. The wireless network 100 may include one or more network nodes 110 (shown as network node 110a, network node 110b, network node 110c, and network node 110d), user equipment (UE) 120 or multiple UEs 120 (shown as UE 120a, UE 120b, UE 120c, UE 120d, and UE 120e), and / or other entities. The network node 110 is a network node that communicates with the UE 120. As shown in the figure, the network node 110 may include one or more network nodes. For example, the network node 110 may be a converged network node, which means that the converged 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). For another example, the network node 110 may be a decomposed network node (sometimes referred to as a decomposed base station), which means that the network node 110 is configured to utilize a protocol stack that is physically or logically distributed between 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)).

[0033] In some examples, the network node 110 is or includes a network node (such as an RU) that communicates with the UE 120 via a radio access link. In some examples, the network node 110 is or includes a network node (such as a DU) that communicates with other network nodes 110 via a fronthaul link or a midhaul link. In some examples, the network node 110 is or includes a network node (such as a CU) that communicates with other network nodes 110 via a midhaul link or communicates with the core network via a backhaul link. In some examples, the network node 110 (such as an aggregated network node 110 or a decomposed network node 110) may include multiple network nodes, such as one or more RUs, one or more CUs, and / or one or more DUs. The 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 transmit receive point (TRP), a DU, a 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, network nodes 110 may be interconnected to each other or to one or more other network nodes 110 in wireless network 100 via various types of fronthaul, midhaul, and / or backhaul interfaces (such as direct physical connections, air interfaces, or virtual networks) using any suitable transport network.

[0034] In some examples, the network node 110 may provide communication coverage for a particular geographic area. In the Third Generation Partnership Project (3GPP), the term "cell" may refer to the coverage area of ​​the network node 110 and / or the network node subsystem serving the coverage area, depending on the context in which the term is used. The 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., a radius of several kilometers) and may allow unrestricted access by a UE 120 with a service subscription. A pico cell may cover a relatively small geographic area and may allow unrestricted access by a UE 120 with a service subscription. A femto cell may cover a relatively small geographic area (e.g., a home) and may allow restricted access by a UE 120 associated with the femto cell (e.g., a UE 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. The network node 110 for a femto cell may be referred to as a femto network node or a home network node. Figure 1In the example shown, network node 110a may be a macro network node for macro cell 102a, network node 110b may be a pico network node for pico cell 102b, and network node 110c may be a femto network node for femto cell 102c. The network node may support one or more (e.g., three) cells. In some examples, the cells may not necessarily be stationary, and the geographic area of ​​the cells may move depending on the location of the mobile network node 110 (e.g., a mobile network node).

[0035] In some aspects, the term "base station" or "network node" may refer to a converged base station, a decomposed base station, an integrated access and backhaul (IAB) node, a relay node, or one or more components thereof. For example, in some aspects, a "base station" or "network node" may refer to a CU, a DU, a RU, a near real-time (near RT) RAN intelligent controller (RIC), or a non-real-time (non-RT) RIC, or a combination thereof. In some aspects, the term "base station" or "network node" may refer to a device configured to perform one or more functions (such as those described herein in conjunction with the network node 110). In some aspects, the term "base station" or "network node" may refer to a plurality of devices configured to perform one or more functions. For example, in some distributed systems, each of a number of different devices (which may be located in the same geographic location or in different geographic locations) may be configured to perform at least a portion of a function, or to repeat the execution of at least a portion of the function, and the term "base station" or "network node" may refer to any one or more of these different devices. In some aspects, the term "base station" or "network node" may refer to one or more virtual base stations or one or more virtual base station functions. For example, in some aspects, two or more base station functions may be instantiated on a single device. In some aspects, the term "base station" or "network node" may refer to one of the base station functions but not another base station function. In this way, a single device may include more than one base station.

[0036] The wireless network 100 may include one or more relay stations. A relay station is a network node that can receive transmissions of data from an upstream node (e.g., a network node 110 or a UE 120) and transmit transmissions of data to a downstream node (e.g., a UE 120 or a network node 110). A relay station may be a UE 120 that is capable of relaying transmissions for other UEs 120. Figure 1 In the example shown, a network node 110d (e.g., a relay network node) may communicate with a network node 110a (e.g., a macro network node) and a UE 120d to facilitate communications 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, etc.

[0037] The wireless network 100 may be a heterogeneous network that includes different types of network nodes 110, such as macro network nodes, pico network nodes, femto network nodes, relay network nodes, etc. These different types of network nodes 110 may have different transmit power levels, different coverage areas, and / or different impacts on interference in the wireless network 100. For example, a macro network node may have a high transmit power level (e.g., 5 watts to 40 watts), while a pico network node, a femto network node, and a relay network node may have a lower transmit power level (e.g., 0.1 watt to 2 watts).

[0038] The network controller 130 may be coupled to or in communication with a set of network nodes 110 and may provide coordination and control for the 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 also communicate directly with each other or indirectly via a wireless backhaul communication link or a wired backhaul communication link. In some aspects, the network controller 130 may be or may include a CU or a core network device.

[0039] UE 120 can be distributed throughout the wireless network 100, and each UE 120 can be stationary or mobile. UE 120 can include, for example, an access terminal, a terminal, a mobile station and / or a subscriber unit. UE 120 can 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 computer, 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 vehicle component or sensor, a smart meter / sensor, an industrial manufacturing equipment, a global positioning system device, a UE function of a network node and / or any other suitable device configured to communicate via a wireless or wired medium.

[0040] Some UEs 120 may be considered as machine type communication (MTC) or evolved or enhanced machine type communication (eMTC) UEs. MTC UEs and / or eMTC UEs may include, for example, robots, drones, remote devices, sensors, meters, monitors, and / or location tags, which may communicate with a network node, another device (e.g., a remote device), or some other entity. Some UEs 120 may be considered as Internet of Things (IoT) devices, and / or may be implemented as NB-IoT (narrowband IoT) devices. Some UEs 120 may be considered as customer premises equipment. UE 120 may be included inside a housing that houses components of UE 120, such as a processor component and / or a memory component. In some examples, the processor component and the memory component may be coupled together. For example, a processor component (e.g., one or more processors) and a memory component (e.g., a memory) may be operably coupled, communicatively coupled, electronically coupled, and / or electrically coupled.

[0041] In general, any number of wireless networks 100 may be deployed in a given geographic area. Each wireless network 100 may support a specific RAT and may operate on one or more frequencies. RAT may be referred to as a radio technology, air interface, etc. Frequency may be referred to as a carrier, frequency channel, etc. Each frequency may support a single RAT in a given geographic area to avoid interference between wireless networks of different RATs. In some cases, NR or 5G RAT networks may be deployed.

[0042] In some examples, actions described herein as being performed by network node 110 may be performed by multiple different network nodes. For example, a configuration action may be performed by a first network node (e.g., CU or DU), and a radio communication action may be performed by a second network node (e.g., DU or RU).

[0043] As used herein, "sending" a communication from network node 110 to UE 120 may refer to sending directly (e.g., from network node 110 to UE 120) or indirectly via one or more other network nodes or devices. For example, if network node 110 is a DU, indirect transmission to UE 120 may include the DU sending the communication to the RU and the RU sending the communication to UE 120. Similarly, "sending" a communication from UE 120 to network node 110 may refer to sending directly (e.g., from UE 120 to network node 110) or indirectly via one or more other network nodes or devices. For example, if network node 110 is a DU, indirect transmission to network node 110 may include the UE 120 sending the communication to the RU and the RU sending the communication to the DU.

[0044] In some examples, two or more UEs 120 (e.g., shown as UE 120a and UE 120e) may communicate directly using one or more sidelink channels (e.g., without using network node 110 as an intermediary to communicate with each other). For example, UE 120 may communicate using peer-to-peer (P2P) communication, device-to-device (D2D) communication, vehicle-to-everything (V2X) protocols (e.g., which may include vehicle-to-vehicle (V2V) protocols, vehicle-to-infrastructure (V2I) protocols, or vehicle-to-pedestrian (V2P) protocols), and / or mesh networks. In such examples, UE 120 may perform scheduling operations, resource selection operations, and / or other operations described elsewhere herein as being performed by network node 110.

[0045] The devices of the wireless network 100 may communicate using an electromagnetic spectrum that may be subdivided into various categories, bands, channels, etc., based on frequency or wavelength. For example, the 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 (interchangeably) referred to as the "below 6 GHz" band in various documents and articles. A similar naming problem sometimes occurs with respect to FR2, which is often (interchangeably) referred to as the "millimeter wave" band in documents and articles, although different from the extremely high frequency (EHF) band (30 GHz-300 GHz) identified as the "millimeter wave" band by the International Telecommunication Union (ITU).

[0046] Frequencies between FR1 and FR2 are generally referred to as mid-band frequencies. Recent 5G NR research has identified the operating bands for these mid-band frequencies as frequency range designation FR3 (7.125GHz-24.25GHz). The bands falling within FR3 can inherit FR1 characteristics and / or FR2 characteristics, so the features of FR1 and / or FR2 can be effectively extended to mid-band frequencies. In addition, higher frequency bands are currently being explored to extend 5G NR operations to more than 52.6GHz. For example, three higher operating bands have been identified as frequency range designations FR4a or FR4-1 (52.6GHz-71GHz), FR4 (52.6GHz-114.25GHz) and FR5 (114.25GHz-300GHz). Each of these higher frequency bands falls within the EHF band.

[0047] In view of the above examples, unless otherwise specifically stated, it should be understood that if the term "below 6 GHz" or the like is used herein, the term may broadly refer to frequencies that may be lower than 6 GHz, may be within FR1, or may include mid-band frequencies. In addition, unless otherwise specifically stated, it should be understood that if the term "millimeter wave" or the like is used herein, the term may broadly refer to 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 the techniques described herein are applicable to those modified frequency ranges.

[0048] In some aspects, the UE 120 may include a communications manager 140. As described in greater detail elsewhere herein, the communications manager 140 may receive an indication from a network node that the UE is to perform a mobile terminated (MT) small data transmission (SDT) (MT-SDT) operation; and in response to the indication, send communications to the network node using: a first uplink resource associated with a mobile originated (MO) SDT (MO-SDT) configuration that is used based at least in part on satisfying one or more conditions, or a second uplink resource associated with a random access configuration that is used based at least in part on not satisfying the one or more conditions or at least in part on not configuring the MO-SDT configuration for the UE. Additionally or alternatively, the communications manager 140 may perform one or more other operations described herein.

[0049] 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 send an indication to a UE that the UE is to perform MT-SDT operations; and in response to the indication, receive communications associated with the UE using: a first uplink resource associated with a MO-SDT configuration that is used based at least in part on satisfying one or more conditions, or a second uplink resource associated with a random access configuration that is used based at least in part on not satisfying the one or more conditions or at least in part on not configuring a MO-SDT configuration for the UE. Additionally or alternatively, the communication manager 150 may perform one or more other operations described herein.

[0050] As indicated above, Figure 1 are provided as examples. Other examples can be found in the Figure 1 The examples described are different.

[0051] Figure 22 is a diagram illustrating an example 200 of a network node 110 communicating with a UE 120 in a wireless network 100 according to the present disclosure. The network node 110 may be equipped with a set of antennas 234a to 234t, such as T antennas (T≥1). The UE 120 may be equipped with a set of antennas 252a to 252r, such as R antennas (R≥1). The network node 110 of example 200 includes one or more radio frequency components, such as an antenna 234 and a modem 254. In some examples, the 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 a radio frequency component that facilitates direct communication with the UE 120, such as one or more CUs or one or more DUs.

[0052] At the network node 110, the transmit processor 220 may receive data intended for the UE 120 (or a set of UEs 120) from the data source 212. The transmit processor 220 may select one or more modulation and coding schemes (MCS) for the UE 120 based at least in part on one or more channel quality indicators (CQI) received from the 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 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 allocation 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., cell-specific reference signals (CRS) or demodulation reference signals (DMRS)) and synchronization signals (e.g., primary synchronization signals (PSS) or secondary synchronization signals (SSS)). The transmit (TX) multiple-input multiple-output (MIMO) processor 230 may perform spatial processing (e.g., pre-coding) on ​​data symbols, control symbols, overhead symbols, and / or reference symbols, where 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 to 232t). For example, each output symbol stream may be provided to a modulator component (shown as MOD) of the modem 232. Each modem 232 may process a corresponding output symbol stream (e.g., for OFDM) using a corresponding modulator component to obtain an output sample stream. Each modem 232 may also process (e.g., convert to analog, amplify, filter, and / or up-convert) the output sample stream using a corresponding modulator component to obtain a downlink signal. The modems 232a to 232t may transmit a set of downlink signals (e.g., T downlink signals) via a set of corresponding antennas 234 (e.g., T antennas) (shown as antennas 234a to 234t).

[0053] At the UE 120, a set of antennas 252 (shown as antennas 252a to 252r) may receive 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 to 254r). For example, each received signal may be provided to a demodulator component (shown as DEMOD) of the modem 254. Each modem 254 may use a corresponding demodulator component to condition (e.g., filter, amplify, downconvert, and / or digitize) the 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 modem 254, may perform MIMO detection on the received symbols where applicable, and may provide detected symbols. The receive processor 258 may process (e.g., demodulate and decode) the detected symbols, may provide decoded data for the UE 120 to the data sink 260, and may provide decoded control information and system information to the controller / processor 280. The term "controller / processor" may refer to one or more controllers, one or more processors, or a combination thereof. The 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 things. In some examples, one or more components of the UE 120 may be included in the housing 284.

[0054] 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.

[0055] One or more antennas (e.g., antennas 234a to 234t and / or antennas 252a to 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, etc. Antenna panels, antenna groups, sets of antenna elements, and / or antenna arrays may include one or more antenna elements (in a single housing or multiple housings), sets of coplanar antenna elements, sets of non-coplanar antenna elements, and / or coupled to one or more transmit and / or receive components (such as antennas). Figure 2 One or more antenna elements of one or more components).

[0056] On the uplink, at the UE 120, the transmit processor 264 may receive and process data from the data source 262 and control information from the controller / processor 280 (e.g., for reports including RSRP, RSSI, RSRQ, and / or CQI). The transmit processor 264 may generate reference symbols for one or more reference signals. The symbols from the transmit processor 264 may be pre-decoded by the TX MIMO processor 266, where applicable, further processed by the modem 254 (e.g., for DFT-s-OFDM or CP-OFDM), and sent 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 an antenna 252, a modem 254, a MIMO detector 256, a receive processor 258, a transmit processor 264, and / or a TX MIMO processor 266. The transceiver may be used by a processor (eg, controller / processor 280) and memory 282 to perform the functions described herein (eg, with reference to Figures 8 to 12 )Aspects of any of the methods described herein.

[0057] At the network node 110, uplink signals from the UE 120 and / or other UEs may be received by the antenna 234, processed by the modem 232 (e.g., a demodulator component (shown as DEMOD) of the modem 232), detected by the MIMO detector 236 (where applicable), and further processed by the receive processor 238 to obtain decoded data and control information transmitted by the UE 120. The receive processor 238 may provide the decoded data to the data sink 239 and 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 communication and / or uplink communication. 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 antenna 234, modem 232, MIMO detector 236, receive processor 238, transmit processor 220, and / or TX MIMO processor 230. The transceiver may be used by a processor (e.g., controller / processor 240) and memory 242 to perform operations described herein (e.g., with reference to Figures 8 to 12 )Aspects of any of the methods described herein.

[0058] The controller / processor 240 of the network node 110, the controller / processor 280 of the UE 120, and / or Figure 2 Any other components of the UE 120 may perform one or more techniques associated with resource configuration and selection for downlink small data transmission, 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 Figure 2 Any other component of the Fig. 9 The process of 900 Fig.10 1000 and / or operations of other processes as described herein. Memory 242 and memory 282 may store data and program codes for network node 110 and UE 120, respectively. In some examples, memory 242 and / or memory 282 may include a non-transitory computer-readable medium storing one or more instructions (e.g., code and / or program code) for wireless communication. For example, the one or more instructions, when executed (e.g., directly, or after compilation, conversion, and / or interpretation) by one or more processors of network node 110 and / or UE 120, may cause the one or more processors, UE 120, and / or network node 110 to perform or direct, for example, Fig. 9 The process of 900 Fig.10 The process 1000 and / or operations of other processes as described herein. In some examples, executing instructions may include running instructions, converting instructions, compiling instructions, and / or interpreting instructions, among others.

[0059] In some aspects, the UE 120 includes: means for receiving an indication from a network node that the UE is to perform MT-SDT operations; and / or means for sending a communication to the network node in response to the indication using: a first uplink resource associated with a MO-SDT configuration to be used based at least in part on satisfying one or more conditions, or a second uplink resource associated with a random access configuration to be used based at least in part on not satisfying the one or more conditions or based at least in part on not configuring a MO-SDT configuration for the UE. Means for the UE 120 to perform operations described herein may include, for example, one or more of the following: a communications manager 140, an antenna 252, a modem 254, a MIMO detector 256, a receive processor 258, a transmit processor 264, a TX MIMO processor 266, a controller / processor 280, or a memory 282.

[0060] In some aspects, the network node 110 includes: means for sending, for a UE, an indication that the UE is to perform MT-SDT operations; and / or means for, in response to the indication, receiving communications associated with the UE using: first uplink resources associated with a MO-SDT configuration used based at least in part on satisfying one or more conditions, or second uplink resources associated with a random access configuration used based at least in part on not satisfying the one or more conditions or based at least in part on not configuring a MO-SDT configuration for the UE. In some aspects, means for the network node 110 to perform operations described herein may include, for example, one or more of the following: a communications manager 150, a transmit processor 220, a TX MIMO processor 230, a modem 232, an antenna 234, a MIMO detector 236, a receive processor 238, a controller / processor 240, a memory 242, or a scheduler 246.

[0061] Although Figure 2 The blocks in the 200 and 210 are illustrated as distinct components, but the functionality described above for these blocks may be implemented in a single hardware, software, or combined component or in various combinations of components. For example, the functionality described for 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.

[0062] As indicated above, Figure 2 are provided as examples. Other examples can be found in the Figure 2 The examples described are different.

[0063] The deployment of a communication system (such as a 5G NR system) can be arranged with various components or components in a variety of ways. 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 network equipment can be implemented in an aggregated or decomposed architecture. For example, a base station (such as a node B (NB), an evolved NB (eNB), an NR BS, a 5G NB, an access point (AP), a TRP or a cell, etc.) or one or more units (or one or more components) that perform base station functionality can be implemented as an aggregated base station (also called an independent base station or a monolithic base station) or a decomposed base station. "Network entity" or "network node" may refer to a decomposed base station or one or more units of a decomposed base station (such as one or more CUs, one or more DUs, one or more RUs or a combination thereof).

[0064] An aggregated base station (e.g., an aggregated network node) may be configured to utilize a radio protocol stack physically or logically integrated within a single RAN node (e.g., within a single device or unit). A decomposed base station (e.g., a decomposed network node) may be configured to utilize a protocol stack physically or logically distributed between 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 across one or more other network nodes. A DU may be implemented to communicate with one or more RUs. Each of the CU, DU, and RU may also be implemented as a virtual unit, such as a virtual central unit (VCU), a virtual distributed unit (VDU), or a virtual radio unit (VRU), and the like.

[0065] Base station type operations or network designs may take into account the aggregated nature of base station functionality. For example, a decomposed base station may be utilized in an IAB network, an open radio access network (O-RAN (such as a network configuration initiated by the O-RAN Alliance)), or a virtualized radio access network (vRAN, also known as a cloud radio access network (C-RAN)) to facilitate the scaling of a communication system by separating base station functionality into one or more units that can be deployed separately. A decomposed base station may include functionality implemented across two or more units at various physical locations, as well as functionality implemented virtually for at least one unit, which may enable flexibility in network design. Individual units of a decomposed base station may be configured for wired or wireless communication with at least one other unit of the decomposed base station.

[0066] Figure 3 3 is a diagram illustrating an example decomposed base station architecture 300 according to the present disclosure. The decomposed base station architecture 300 may include a CU 310, which may communicate directly with a core network 320 via a backhaul link, or indirectly with the core network 320 through one or more decomposed 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). The CU 310 may communicate with one or more DUs 330 via respective midhaul links, such as via an F1 interface. 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 served simultaneously by multiple RUs 340.

[0067] Each of the units (including CU 310, DU 330, RU 340) and the near-RT RIC 325, non-RT RIC 315, and SMO framework 305 may include or be coupled to one or more interfaces configured to receive or transmit signals, data, or information (collectively referred to as signals) via a wired or wireless transmission medium. Each of the units or an associated processor or controller that provides instructions to one or more communication interfaces of the corresponding unit may be configured to communicate with one or more of the other units via a transmission medium. In some examples, each of the units may include a wired interface and a wireless interface, the wired interface being configured to receive signals or transmit signals to one or more of the other units via a wired transmission medium, the wireless interface being configured to receive signals or transmit signals to one or more of the other units via a wired transmission medium, or both.

[0068] In some aspects, CU 310 may host one or more higher layer control functions. Such control functions may include radio resource control (RRC) functions, packet data convergence protocol (PDCP) functions, or service data adaptation protocol (SDAP) functions, etc. Each control function may be implemented using an interface that is configured to communicate signals with other control functions hosted by CU 310. CU 310 may be configured to handle user plane functionality (e.g., central unit-user plane (CU-UP) functionality), control plane functionality (e.g., central unit-control plane (CU-CP) functionality), or a combination thereof. In some specific implementations, CU 310 may be logically divided into one or more CU-UP units and one or more CU-CP units. When implemented in an O-RAN configuration, the CU-UP unit may communicate bidirectionally with the CU-CP unit via an interface (such as an E1 interface). As needed, CU 310 may be implemented to communicate with DU 330 for network control and signaling.

[0069] Each DU 330 may correspond to a logical unit that includes one or more base station functions for controlling 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 MAC layer, and one or more high physical (PHY) layers, at least in part, according to a functional partitioning (such as that defined by 3GPP). In some aspects, one or more high PHY layers may be implemented by one or more modules for forward error correction (FEC) encoding and decoding, scrambling, modulation and demodulation, etc. In some aspects, the DU 330 may also host one or more low PHY layers, such as one or more modules for fast Fourier transform (FFT), inverse FFT (iFFT), digital beamforming or physical random access channel (PRACH) extraction and filtering, etc. Each layer (which may also be referred to as a module) may be implemented using an interface that is configured to communicate signals with other layers (and modules) hosted by the DU 330 or with control functions hosted by the CU 310.

[0070] Each RU 340 may implement lower layer functionality. In some deployments, the RU 340 controlled by the DU 330 may correspond to a logical node that hosts RF processing functions, or low PHY layer functions (such as performing FFT, performing iFFT, digital beamforming, or PRACH extraction and filtering, etc.) based on functional splitting (e.g., functional splitting defined by 3GPP). In this architecture, each RU 340 may be operated to handle over-the-air (OTA) communications with one or more UEs 120. In some specific implementations, real-time and non-real-time aspects of control plane communications and user plane communications with the RU 340 may be controlled by the corresponding DU 330. In some scenarios, this configuration may enable each DU 330 and CU 310 to be implemented in a cloud-based RAN architecture such as a vRAN architecture.

[0071] The SMO framework 305 may be configured to support RAN deployment and provisioning of non-virtualized network elements 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 operation 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 lifecycle management (such as instantiating virtualized network elements) via a cloud computing platform interface (such as an O2 interface). Such virtualized network elements may include, but are not limited to, CU 310, DU 330, RU 340, non-RT RIC 315, and near-RT RIC 325. In some specific implementations, the SMO framework 305 may communicate with hardware aspects of the 4G RAN (such as an open eNB (O-eNB) 311) via the O1 interface. Additionally, in some implementations, the SMO framework 305 can communicate directly with each of the one or more RUs 340 via a corresponding O1 interface. The SMO framework 305 can also include a non-RT RIC 315 configured to support the functionality of the SMO framework 305.

[0072] The non-RT RIC 315 may be configured to include logic functions that enable non-real-time control and optimization of RAN elements and resources, artificial intelligence / machine learning (AI / ML) workflows including model training and updating, or policy-based guidance of applications / features in the near-RT RIC 325. The non-RT RIC 315 may be coupled to or in communication with the near-RT RIC 325 (such as via an A1 interface). The near-RT RIC 325 may be configured to include logic functions that enable near-real-time control and optimization of RAN elements and resources via data collection and actions through an interface (such as via an E2 interface) that connects one or more CUs 310, one or more DUs 330, or both, and the O-eNB with the near-RT RIC 325.

[0073] In some implementations, in order to generate an AI / ML model to be deployed in the near-RT RIC 325, the non-RT RIC 315 may receive parameters or external enrichment information from an external server. Such information may be utilized by the near-RT RIC 325 and may be received from a non-network data source or from a network function at the SMO framework 305 or the non-RT RIC 315. 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 of performance and employ AI / ML models to perform corrective actions through the SMO framework 305 (such as via reconfiguration of the O1 interface) or via the creation of RAN management policies (such as A1 interface policies).

[0074] As indicated above, Figure 3 are provided as examples. Other examples can be found in the Figure 3 The examples described are different.

[0075] Figure 4 An example 400 of a wireless network (e.g., wireless network 100) in which a UE (e.g., UE 120) can support additional communication modes according to the present disclosure is illustrated. The UE can be communicatively connected to one or more network nodes 110 in the wireless network. For example, the UE can be connected to one or more network nodes 110 in a dual connectivity configuration. In this case, the first network node 110 can serve the UE as a primary node, and the second network node 110 can serve the UE as a secondary node.

[0076] like Figure 4 As illustrated, the UE may support a connected communication mode (e.g., RRC connected mode 402), an idle communication mode (e.g., RRC idle mode 404), and an inactive communication mode (e.g., RRC inactive mode 406). The RRC connected mode 402 may be referred to herein as the RRC active mode. The RRC inactive mode 406 may reside functionally between the RRC connected mode 402 and the RRC idle mode 404.

[0077] The UE may transition between different modes based at least in part on various commands and / or communications received from one or more network nodes 110. For example, the UE may transition from RRC connected mode 402 or RRC inactive mode 406 to RRC idle mode 404 based at least in part on receiving an RRCRelease communication. For another example, the UE may transition from RRC connected mode 402 to RRC inactive mode 406 based at least in part on receiving an RRCRelease communication with suspendConfig. For another example, the UE may transition from RRC idle mode 404 to RRC connected mode 402 based at least in part on receiving an RRCSetupRequest communication. For another example, the UE may transition from RRC inactive mode 406 to RRC connected mode 402 based at least in part on receiving an RRCResumeRequest communication.

[0078] When transitioning to the RRC inactive mode 406, the UE and / or one or more network nodes 110 may store the UE context (e.g., access stratum (AS) context and / or higher layer configuration). This permits the UE and / or one or more network nodes 110 to apply the stored UE context when the UE transitions from the RRC inactive mode 406 to the RRC connected mode 402 to resume communication with the one or more network nodes 110, which reduces the latency of transitioning to the RRC connected mode 402 relative to transitioning from the RRC idle mode 404 to the RRC connected mode 402.

[0079] In some cases, the UE may be communicatively connected with a new primary node (e.g., a primary node that is different from the last serving primary node when the UE transitions to the RRC idle mode 404 or the RRC inactive mode 406) when transitioning to the RRC connected mode 402. In this case, the new primary node may be responsible for identifying the secondary node for the UE in the dual connectivity configuration.

[0080] In some cases, the UE 120 may be enabled to send and / or receive one or more communications (e.g., uplink communications and / or downlink communications) while operating in the RRC idle mode 404 or the RRC inactive mode 406. For example, the UE 120 may be configured to perform SDT operations while operating in the RRC idle mode 404 or the RRC inactive mode 406, as described in greater detail elsewhere herein.

[0081] In some cases, the UE may support SDT communications. For example, (e.g., as combined with Figure 5 The two-step random access channel (RACH) procedure depicted and described herein and (e.g., as combined with Figure 6The four-step random access channel (RACH) procedure depicted and described herein can both be applied to random access (RA) SDT in RRC inactive mode. UE 120 can re-establish at least SDTPDCP and recover SDT radio bearers (RBs) configured for small data. In subsequent data transmissions (after successful contention resolution), the UE can monitor dynamic grants (DGs) by cell radio network temporary identifiers (C-RNTIs) in a separate common search space (CSS) in RA-SDT (if configured). From the perspective of RRC, an RRC release message can be sent at the end of the SDT session to terminate the SDT procedure.

[0082] The configuration of the Configuration Grant (CG) resources for UE MO-SDT may be included in the RRC release message. The RRC release message may also be used to reconfigure or release CG-SDT resources when UE 120 is in RRC inactive mode. The configuration of the CG resources may include a type 1 CG configuration (e.g., as defined by a wireless communication standard (such as 3GPP) or otherwise determined). The network configuration may support multiple CG-SDT configurations per carrier in RRC inactive mode. For CG-SDT, subsequent data transmissions may use the CG resources for new data transmissions or the DG for retransmissions.

[0083] In some examples, UE 120 may be enabled to send uplink communications using MO-SDT procedures (e.g., when operating in RRC inactive mode 406). Uplink SDT may be used interchangeably with MO-SDT herein. In some examples, UE 120 may be enabled to receive downlink communications using MT-SDT procedures (e.g., when operating in RRC inactive mode 406). MT-SDT may be used interchangeably with downlink SDT herein.

[0084] As indicated above, Figure 4 are provided as examples. Other examples can be found in the Figure 4 The examples described are different.

[0085] Figure 5 5 is a diagram illustrating an example 500 of a two-step random access procedure associated with SDT according to the present disclosure. Figure 5 As shown, the network node 110 and the UE 120 may communicate with each other to perform the SDT two-step random access procedure. In some examples, the SDT two-step random access procedure may be associated with a RA-SDT configuration, such as an uplink RA-SDT configuration or a downlink RA-SDT configuration.

[0086] As shown by reference numeral 505, network node 110 may send an RRC release communication (e.g., RRCRelease), and UE 120 may receive the RRC release communication (e.g., RRCRelease). The RRC release communication may be an RRCRelease communication with suspendConfig. In some examples, the RRC release communication may indicate a RA-SDT configuration. For example, the RRC release communication may indicate an uplink (or MO) RA-SDT configuration to be used by UE 120 to initiate an uplink SDT (e.g., when UE 120 is operating in RRC inactive mode). Additionally or alternatively, the RRC release communication may indicate a downlink (or MT) RA-SDT configuration to be used for MT-SDT (e.g., when UE 120 is operating in RRC inactive mode). As shown by reference numeral 510, UE 120 may transition to RRC inactive mode based on receiving the RRC release communication.

[0087] For example, for a conventional (e.g., non-SDT) random access configuration, the network node 110 may send one or more synchronization signal blocks (SSBs) and random access configuration information, 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 (e.g., non-SDT random access configuration information) may be sent in (e.g., in one or more system information blocks (SIBs)) system information and / or SSBs and / or indicated by the system information and / or SSBs, such as for contention-based random access. Additionally or alternatively, the random access configuration information may be sent in an RRC message and / or a physical downlink control channel (PDCCH) command message that triggers a RACH procedure, such as for contention-free random access. The random access configuration information may include one or more parameters to be used in a two-step random access procedure, such as one or more parameters for sending a random access message (RAM) and / or receiving a random access response (RAR) to a RAM.

[0088] In some examples, as shown by reference numeral 515, the network node 110 may send a paging communication, and the UE 120 may receive the paging communication. For example, the UE 120 may receive a paging communication for an MT-SDT procedure. The paging communication may indicate that the network (e.g., the network node 110) has downlink data to send to the UE 120. In some examples, the paging communication may include an SDT indication (e.g., indicating that the downlink data is associated with a downlink or MT, SDT procedure). In some examples, the paging communication may include an indication of a preamble dedicated to an SDT random access procedure.

[0089] As shown in reference numeral 520, UE 120 may send a RAM preamble, and network node 110 may receive the RAM preamble. As shown in reference numeral 525, UE 120 may send a RAM payload, and network node 110 may receive the RAM payload. As shown, as part of the initial (or first) step of the SDT two-step random access procedure, UE 120 may send a RAM preamble and a RAM payload to network node 110. In some examples, RAM may be referred to as message A, msgA, a first message, or an initial message in a two-step random access procedure. In addition, in some examples, the RAM preamble may be referred to as a message A preamble, a msgA preamble, a preamble, or a PRACH preamble, and the RAM payload may be referred to as a message A payload, a msgA payload, or a payload. In some examples, RAM may include some or all of the contents of message 1 (msg1) and message 3 (msg3) of the four-step random access procedure described in more detail below. For example, the RAM preamble may include some or all of the contents of message 1 (e.g., a PRACH preamble), and the RAM payload may include some or all of the contents of message 3 (e.g., a UE identifier, uplink control information (UCI), and / or a physical uplink shared channel (PUSCH) transmission).

[0090] In some examples, the RAM payload may include an RRC resume request communication (e.g., RRCResumeRequest). In some examples, the RAM payload may include uplink data. In some examples, the RAM payload may include a buffer status report (BSR) associated with UE 120. For example, the BSR may be included in a medium access control (MAC) control element (MAC-CE).

[0091] In some examples, the RA-SDT procedure may be associated with UE context relocation. For example, the first network node 110 receiving the RAM payload may be different from the second network node 110 that sends the RRC release communication (e.g., as described above in conjunction with reference number 505). In an example of RA-SDT with UE context relocation, the first network node 11- may communicate with the second network node 110 to obtain UE context information associated with the UE 120. For example, the UE context information may include information for establishing a communication connection with the RAN, such as a protocol data unit (PDU) session context, security keys, mobility restrictions and / or UE capabilities, etc. As described above, the first network node 110 may store the UE context information associated with the UE 120 based on the UE 120 transitioning to the RRC inactive mode. The second network node 110 may send a retrieve UE context request (e.g., based on the second network node 110 receiving the RAM payload), and the first network node 110 may receive the retrieve UE context request (e.g., based on the second network node 110 receiving the RAM payload). First network node 110 may send a retrieve UE context response communication indicating UE context information, and second network node 110 may receive a retrieve UE context response communication indicating UE context information. Second network node 110 may communicate with one or more core network nodes (e.g., an access and mobility function (AMF) or a user plane function (UPF)) to establish a connection associated with UE 120.

[0092] In other examples, first network node 110 may retain UE context information. In such examples, first network node 110 may send a partial UE context transfer communication (e.g., in response to the retrieve UE context request), and second network node may receive the partial UE context transfer communication (e.g., in response to the retrieve UE context request). Second network node 110 may establish a SDTRLC entity for communicating with UE 120 based on information included in the partial UE context transfer communication. First network node 110 may retain a PDCP entity associated with UE 120 at first network node 110.

[0093] As indicated by reference numeral 530, the network node 110 may receive the RAM preamble transmitted by the UE 120. If the network node 110 successfully receives and decodes the RAM preamble, the network node 110 may then receive and decode the RAM payload.

[0094] As shown by reference numeral 535, the network node 110 may send a RAR (sometimes referred to as a RAR message). As shown, the network node 110 may send a RAR message as part of the second step of the two-step random access procedure. In some examples, the RAR message may be referred to as message B, msgB, or the second message in the two-step random access procedure. The RAR message may include some or all of the contents of message 2 (msg2) and message 4 (msg4) of the four-step random access procedure. For example, the RAR message may include a detected PRACH preamble identifier, a detected UE identifier, a timing advance value, and / or contention resolution information.

[0095] As part of the second step of the two-step random access procedure, the network node 110 may send a PDCCH communication for the RAR. The PDCCH communication may schedule a physical downlink shared channel (PDSCH) communication including the RAR. For example, the PDCCH communication may indicate a resource allocation for the PDSCH communication (e.g., in downlink control information (DCI)). In the RA-SDT procedure, the RAR may not include RRC communications or RRC information. For example, the RAR may indicate contention resolution information for the SDT procedure, but may not cause the UE 120 to transition out of the RRC inactive mode. In other words, after receiving the RAR, the UE 120 may remain in the RRC inactive mode.

[0096] As part of the second step of the two-step random access procedure, the network node 110 may send a PDSCH communication for the RAR as scheduled by the PDCCH communication, as shown by reference numeral 540. The RAR may be included in the MAC PDU of the PDSCH communication. In some examples, as shown by reference numeral 545, if the UE 120 successfully receives the RAR, the UE 120 may send a hybrid automatic repeat request (HARQ) acknowledgment (ACK).

[0097] like Figure 5As shown, based on performing the RA-SDT procedure, the UE 120 may be enabled to send an uplink SDT and / or receive an MT-SDT. For example, as shown by reference numeral 550, for an MO-SDT procedure (e.g., MO-SDT), if the UE 120 successfully receives the RAR, the UE 120 may send uplink data (e.g., uplink small data having a size less than or equal to the MO-SDT threshold). As shown by reference numeral 555, the network node 110 may send downlink data in response to the uplink data (e.g., downlink small data having a size less than or equal to the MT-SDT threshold), and the UE 120 may receive downlink data in response to the uplink data (e.g., downlink small data having a size less than or equal to the MT-SDT threshold). Alternatively, for an MT-SDT procedure (e.g., MT-SDT), the network node 110 may send downlink data to the UE 120 after sending the RAR. For example, the downlink data may be scrambled with the C-RNTI. The C-RNTI may be indicated via the RAR. UE 120 may use the C-RNTI to decode downlink data.

[0098] like Figure 5 As shown, UE 120 and network node 110 may continue to exchange SDT communications. As shown by reference numeral 560, to end the session associated with the SDT procedure, network node 110 may send an RRC release communication, and UE 120 may receive the RRC release communication. The RRC release communication may be an RRC release communication with suspendConfig. The RRC release communication may cause UE 120 to release or suspend the RA-SDT configuration used for the above-mentioned random access procedure.

[0099] As indicated above, Figure 5 are provided as examples. Other examples can be found in the Figure 5 The examples described are different.

[0100] Figure 6 6 is a diagram illustrating an example 600 of a four-step random access procedure associated with SDT according to the present disclosure. Figure 6 As shown, the network node 110 and the UE 120 may communicate with each other to perform the SDT four-step random access procedure. In some examples, the SDT four-step random access procedure may be associated with a RA-SDT configuration (such as an uplink RA-SDT configuration or a downlink RA-SDT configuration).

[0101] As shown by reference numeral 605, the network node 110 may send an RRC release communication (e.g., RRCRelease), and the UE 120 may receive the RRC release communication (e.g., RRCRelease). The RRC release communication may be an RRCRelease communication with a suspendConfig. In some examples, the RRC release communication may indicate a RA-SDT configuration. For example, the RRC release communication may indicate an uplink (or MO) RA-SDT configuration to be used by the UE 120 to initiate an uplink SDT (e.g., when the UE 120 is operating in an RRC inactive mode). Additionally or alternatively, the RRC release communication may indicate a downlink (or MT) RA-SDT configuration to be used for MT-SDT (e.g., when the UE 120 is operating in an RRC inactive mode). As shown by reference numeral 610, the UE 120 may transition to an RRC inactive mode based on receiving the RRC release communication.

[0102] For example, for a conventional (e.g., non-SDT) random access configuration, the network node 110 may send one or more SSBs and random access configuration information, and the UE 120 may receive one or more SSBs and random access configuration information. In some examples, the random access configuration information may be sent in system information and / or SSBs (e.g., in one or more SIBs) and / or indicated by the system information and / or SSBs, such as for contention-based random access. Additionally or alternatively, the random access configuration information may be sent in an RRC message and / or a PDCCH command message that triggers a RACH procedure, such as for contention-free random access. 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 sending a RAM and / or one or more parameters for receiving a RAR. In some examples, the RA-SDT procedure may or may not be associated with UE context relocation, as described above in conjunction with Figure 5 Describe in more detail.

[0103] In some examples, as shown by reference numeral 615, the network node 110 may send a paging communication, and the UE 120 may receive the paging communication. For example, the UE 120 may receive a paging communication for an MT-SDT procedure. The paging communication may indicate that the network (e.g., the network node 110) has downlink data to send to the UE 120. In some examples, the paging communication may include an SDT indication (e.g., indicating that the downlink data is associated with a downlink or MT, SDT procedure). In some examples, the paging communication may include an indication of a preamble dedicated to an SDT random access procedure.

[0104] As shown by reference numeral 620, UE 120 may send a RAM, which may include a preamble (sometimes referred to as a random access preamble, a PRACH preamble, or a RAM preamble). The message including the preamble may be referred to as message 1, msg1, MSG1, a first message, or an initial message in the four-step random access procedure. The random access message may include a random access preamble identifier.

[0105] As shown by reference numeral 625, the network node 110 may send a RAR as a response to the preamble. The message including the RAR may be referred to as message 2, msg2, MSG2, or a second message in the four-step random access procedure. In some examples, the RAR may indicate a 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 send message 3 (msg3).

[0106] In some examples, as part of the second step of the four-step random access procedure, the network node 110 may send a PDCCH communication for the RAR. The PDCCH communication may schedule a PDSCH communication including 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 send a PDSCH communication for the RAR as scheduled by the PDCCH communication. The RAR may be included in the MAC PDU of the PDSCH communication.

[0107] As shown by reference numeral 630, UE 120 may send uplink communications. For example, the uplink communications may be an RRC connection request message. The uplink communications message may be referred to as message 3, msg3, MSG3, or the third message of the SDT four-step random access procedure. In some examples, the uplink communications request may include a UE identifier, a UCI, and / or a PUSCH communication (e.g., an RRC connection request). In some examples, the uplink communications may include an RRC recovery request communication (e.g., RRCResumeRequest). In some examples, the uplink communications may include uplink data. In some examples, the uplink communications may include a BSR associated with UE 120. For example, the BSR may be included in a MAC-CE.

[0108] As shown by reference numeral 635, the network node 110 may send a response. The response may be referred to as message 4, msg4, MSG4, or the fourth message of the SDT four-step random access procedure. In some examples, the response may include a detected UE identifier, a timing advance value, and / or contention resolution information. In the RA-SDT procedure, the response may not include RRC communication or RRC information. For example, the response may indicate contention resolution information for the SDT procedure, but may not cause the UE 120 to transition out of the RRC inactive mode. In other words, after receiving the response, the UE 120 may remain in the RRC inactive mode. In some examples, as shown by reference numeral 640, if the UE 120 successfully receives the RRC connection establishment message, the UE 120 may send a HARQ ACK.

[0109] like Figure 6 As shown, based on performing the RA-SDT procedure, the UE 120 may be enabled to send an uplink SDT and / or receive an MT-SDT. For example, as shown by reference numeral 645, for an MO-SDT procedure (e.g., MO-SDT), if the UE 120 successfully receives the response, the UE 120 may send uplink data (e.g., uplink small data having a size less than or equal to the MO-SDT threshold). As shown by reference numeral 650, the network node 110 may send downlink data (e.g., downlink small data having a size less than or equal to the MT-SDT threshold) in response to the uplink data, and the UE 120 may receive downlink data (e.g., downlink small data having a size less than or equal to the MT-SDT threshold) in response to the uplink data. Alternatively, for an MT-SDT procedure (e.g., MT-SDT), the network node 110 may send downlink data to the UE 120 after sending the response. For example, the downlink data may be scrambled with the C-RNTI. The C-RNTI may be indicated via the RAR. UE 120 may use the C-RNTI to decode downlink data.

[0110] like Figure 6 As shown, UE 120 and network node 110 may continue to exchange SDT communications. As shown by reference numeral 655, to end the session associated with the SDT procedure, network node 110 may send an RRC release communication, and UE 120 may receive the RRC release communication. The RRC release communication may be an RRC release communication with suspendConfig. The RRC release communication may cause UE 120 to release or suspend the RA-SDT configuration used for the above-mentioned random access procedure.

[0111] As indicated above, Figure 6 are provided as examples. Other examples can be found in the Figure 6 The examples described are different.

[0112] Figure 7 700 is a diagram illustrating an example of a CG-SDT procedure according to the present disclosure. Figure 7 As shown, network node 110 and UE 120 may communicate with each other to perform a CG-SDT procedure. CG communication may include periodic uplink communication configured for UE 120, so that network node 110 does not need to transmit a separate DCI to schedule each uplink communication, thereby saving signaling overhead. In some examples, the CG-SDT procedure may be associated with a CG-SDT configuration (such as an uplink CG-SDT configuration or a downlink CG-SDT configuration).

[0113] As shown by reference numeral 705, the network node 110 may send a CG-SDT configuration, and the UE 120 may receive the CG-SDT configuration. For example, the CG-SDT configuration may indicate a resource allocation for a CG-SDT procedure. In some examples, the CG-SDT configuration may be included in an RRC release communication (such as an RRC release communication with SuspendConfig). The CG-SDT configuration identifying the SDT CG may indicate (e.g., in the time domain, frequency domain, spatial domain, and / or code domain) resource allocation and / or a periodicity associated with the resource allocation. The SDT CG may identify a resource or a set of resources that the UE 120 may use to send an SDT uplink communication (e.g., data and / or control information). For example, the CG-SDT configuration may identify a resource allocation for a PUSCH. In some aspects, the CG-SDT configuration may identify a resource pool or multiple resource pools that may be used by the UE 120 for uplink transmissions.

[0114] In some aspects, the CG-SDT configuration may configure contention-free SDT CG communications with resources dedicated for UE 120 to send SDT uplink communications. In such examples, the CG-SDT configuration may indicate resource allocations (e.g., in the time domain, frequency domain, spatial domain, and / or code domain) dedicated for UE 120 to use to send SDT uplink communications. As shown by reference numeral 710, UE 120 may transition to the RRC inactive mode based on receiving an RRC release communication.

[0115] In some examples, as shown by reference numeral 715, the network node 110 can send a paging communication, and the UE 120 can receive the paging communication. For example, the UE 120 can receive the paging communication of the MT-SDT procedure. The paging communication can indicate that the network (e.g., the network node 110) has downlink data to send to the UE 120. In some examples, the paging communication can include an SDT indication (e.g., indicating that the downlink data is associated with a downlink or MT, SDT procedure).

[0116] As shown by reference numeral 720, UE 120 may send MO-SDT communications using the CG indicated by the CG-SDT configuration, and network node 110 may receive MO-SDT communications using the CG indicated by the CG-SDT configuration. In some examples, the MO-SDT communications may be in response to paging communications (e.g., in MT-SDT procedures). In other examples, UE 120 may send MO-SDT communications based on having uplink data to send to network node 110. In some examples, the MO-SDT communications may include RRC recovery request communications.

[0117] As shown by reference numeral 725, the network node 110 may send a downlink communication in response to the MO-SDT communication, and the UE 120 may receive the downlink communication in response to the MO-SDT communication. In some examples, the downlink communication may include an ACK for the MO-SDT communication. In other examples, the downlink communication may request a retransmission of the MO-SDT communication. In some examples, such as in the MT-SDT procedure, the downlink communication may include a grant (e.g., a dynamic grant) for scheduling SDT downlink communications. For example, the downlink communication may include an indication of a C-RNTI associated with future SDT downlink communications. In the CG-SDT procedure, the downlink communication may not include RRC communications or RRC information. For example, the downlink communication may not cause the UE 120 to transition out of the RRC inactive mode. In other words, after receiving the downlink communication, the UE 120 may remain in the RRC inactive mode.

[0118] like Figure 7 As shown, the UE 120 may be enabled to send an uplink SDT and / or receive an MT-SDT. For example, as shown by reference numeral 730, for an MO-SDT procedure (e.g., MO-SDT), if the UE 120 successfully receives a downlink communication from the network node 110, the UE 120 may send uplink data (e.g., uplink small data having a size less than or equal to the MO-SDT threshold). As shown by reference numeral 735, the network node 110 may send downlink data in response to the uplink data (e.g., downlink small data having a size less than or equal to the MT-SDT threshold), and the UE 120 may receive downlink data in response to the uplink data (e.g., downlink small data having a size less than or equal to the MT-SDT threshold). Alternatively, for an MT-SDT procedure (e.g., MT-SDT), the network node 110 may send downlink data to the UE 120 after sending the response (e.g., as scheduled by a grant included in the downlink communication). For example, the C-RNTI may be used to scramble the downlink data. The UE 120 may use the C-RNTI to decode the downlink data.

[0119] like Figure 7 As shown, UE 120 and network node 110 may continue to exchange SDT communications. As shown by reference numeral 740, to end the session associated with the SDT procedure, network node 110 may send an RRC release communication, and UE 120 may receive the RRC release communication. The RRC release communication may be an RRC release communication with suspendConfig. The RRC release communication may cause UE 120 to release or suspend the CG-SDT configuration used for the above-mentioned random access procedure.

[0120] As indicated above, Figure 7 are provided as examples. Other examples can be found in the Figure 7 The examples described are different.

[0121] As described above, RA-SDT procedures with or without UE context relocation may be supported. In addition, UE 120 may be configured with both a MO-SDT configuration and a MT-SDT configuration. Additionally, an SDT configuration may be associated with different types of configurations, e.g., a RA-SDT configuration (e.g., with or without UE context relocation) or a CG-SDT configuration. Each type of configuration may be associated with corresponding (e.g., different) restrictions or constraints. For example, CG resources used for SDT may only be used by UE 120 within a cell in which UE 120 receives an RRC release communication and transitions to an RRC inactive mode.

[0122] Additionally, the UE 120 may be triggered to receive MT-SDT communications via paging communications that include an SDT indication (e.g., an MT-SDT indication). However, the UE 120 may not expect to receive MT-SDT communications in paging communications. The UE 120 may respond to paging communications via uplink communications, and may expect to receive MT-SDT communications in response to the uplink communications. However, the UE 120 may be enabled to respond to paging communications using either the RA-SDT procedure or the CG-SDT procedure. Therefore, it may not be clear under what conditions or scenarios the UE 120 will respond to paging communications that include an SDT indication using a given SDT procedure.

[0123] In addition, the UE 120 may receive a paging communication including an SDT indication from any network node 110 that is geographically located within a RAN notification area (RNA). An RNA may also be referred to as a paging area. For example, the UE 120 may receive paging communications that trigger MT-SDT procedures from multiple network nodes within a given RNA. Therefore, the UE 120 may not be clear about which SDT uplink resources and / or SDT configuration to use to respond to a paging communication from a given network node 110.

[0124] Some techniques and apparatus described herein enable resource configuration and selection for downlink small data transmission. For example, UE 120 may receive an indication from network node 110 that UE 120 is to perform MT-SDT operation (e.g., the indication may be included in a paging communication). In response to the indication (e.g., in response to the paging communication), UE 120 may send an uplink communication to network node 110. The uplink communication may use a first uplink resource associated with a MO-SDT configuration (e.g., a MO RA-SDT configuration or a MO CG-SDT configuration) based at least in part on satisfying one or more conditions. Alternatively, the uplink communication may use a second uplink resource associated with a random access configuration (e.g., a non-SDT random access configuration) based at least in part on not satisfying the one or more conditions or at least in part on not configuring the MO-SDT configuration for UE 120.

[0125] For example, uplink communications may use resources associated with a CG MO-SDT configuration (e.g., referred to herein as a CG-SDT configuration in some cases) based at least in part on satisfying a first one or more of the one or more conditions. Uplink communications may use resources associated with a random access SDT configuration based at least in part on not satisfying the first one or more conditions and at least in part on satisfying a second one or more of the one or more conditions. Uplink communications may use resources associated with a random access configuration based at least in part on not satisfying the first one or more conditions and the second one or more conditions.

[0126] Thus, use conditions for various MO-SDT configurations for responding to paging communications that trigger MT-SDT procedures may be defined. This may improve efficiency in resource utilization because UE 120 may be enabled to respond to paging communications that trigger MT-SDT procedures using resources configured for the MO-SDT procedures (e.g., thereby eliminating the need to configure or allocate additional resources for the MT-SDT procedures). Additionally, this may reduce signaling overhead, latency, and / or power consumption that would otherwise be associated with the MT-SDT procedures due to configuration and / or use of additional resources (e.g., to be used by UE 120 to respond to paging communications). Furthermore, by defining the use of various MO-SDT configurations to be used when different network nodes 110 trigger MT-SDT operations, this may improve mobility and enhance wireless communication coverage for SDT reception and / or transmission.

[0127] Figure 8 8 is a diagram of an example 800 associated with resource configuration and selection for downlink small data transmission according to the present disclosure. Figure 8As shown, one or more network nodes (e.g., one or more network nodes 110) may communicate with a UE (e.g., UE 120). In some aspects, network node 110 and UE 120 may be part of a wireless network (e.g., wireless network 100). In some aspects, actions described as being performed by network node 110 may be performed by multiple different network nodes. For example, a configuration action may be performed by a first network node (e.g., CU and / or DU), and a radio communication action may be performed by a second network node (e.g., DU and / or RU). UE 120 and network node 110 may be performed in a manner similar to that of FIG. Figure 8 The operations shown are performed after a wireless connection has been established.

[0128] In some aspects, as shown by reference numeral 805, the UE 120 may (e.g., using the transmit component 1104, the communication manager 140, the controller / processor 280, the transmit processor 264, the TX MIMO processor 266, the MOD 254, the antenna 252, and / or the memory 282) transmit a capability report, and the network node 110 may receive (directly or via one or more other network nodes) the capability report. In some aspects, the capability report may indicate that the UE supports performing SDT procedures. For example, the capability report may indicate that the UE 120 supports performing MO-SDT communications and / or MT-SDT communications. In some aspects, the UE 120 may be configured to perform MO-SDT communications and / or MT-SDT communications based at least in part on transmitting the capability report, as described in more detail elsewhere herein. In some aspects, the UE capability report may be included in a UE assistance information (UAI) communication. The UAI communication may indicate mobility information (e.g., indicating whether the UE is moving or stationed), etc.

[0129] As shown by reference numeral 810, the network node 110 may transmit (directly or via one or more other network nodes) configuration information (e.g., using the communication manager 150, the transmit component 1204, the controller / processor 240, the transmit processor 220, the TX MIMO processor 230, the MOD 232, the antenna 234, and / or the memory 242), and the UE 120 may receive the configuration information. In some aspects, the UE 120 may receive the configuration information via one or more of system information (SI) signaling (e.g., via one or more SIBs), RRC signaling, one or more MAC-CEs and / or DCIs, etc. In some aspects, the configuration information may include an indication of one or more configuration parameters for the UE 120 to select (e.g., that the UE 120 has stored and / or that was previously indicated by the network node 110 or another network device), and / or explicit configuration information for the UE 120 to configure itself, etc.

[0130] In some aspects, the configuration information may indicate that the UE is to select uplink resources from resources associated with a MO-SDT configuration or from resources associated with a RACH configuration (e.g., a non-SDT random access configuration) to respond to a paging communication that triggers a MT-SDT procedure (e.g., a MT SDT procedure). In some aspects, the configuration information may indicate one or more conditions (or values ​​of thresholds associated with the one or more conditions) to be used by the UE 120 to determine which configuration is to be associated with the response to the paging communication. In some other aspects, the one or more conditions (or values ​​of thresholds associated with the one or more conditions) may be defined by a wireless communication standard (such as 3GPP) or otherwise determined (e.g., and not signaled to the UE 120).

[0131] For example, the configuration information may indicate a first one or more conditions associated with selecting resources associated with an uplink CG-SDT configuration, a second one or more conditions associated with selecting resources associated with an uplink RA-SDT configuration, and / or a third one or more conditions associated with selecting resources from a random access configuration, and so on. In some aspects, the configuration information may indicate a priority order associated with different uplink configurations that will be used to respond to paging communications that trigger the MT-SDT procedure. For example, the configuration information may indicate that the UE 120 will first attempt to select resources from the uplink CG-SDT configuration (e.g., because these resources may be dedicated to the UE 120 and timing alignment with the network node 110 may have been established). The configuration information may indicate that if the UE 120 cannot (or is not allowed to) select resources from the CG-SDT configuration (e.g., because the first one or more conditions are not met), the UE 120 will attempt to select resources from the uplink RA-SDT configuration. The configuration information may indicate that if UE 120 cannot (or is not allowed) to select resources from the RA-SDT configuration (eg, because the second one or more conditions are not met), then UE 120 will attempt to select resources from the random access configuration. The above conditions are described in more detail elsewhere herein.

[0132] In some aspects, the configuration information may indicate an uplink CG-SDT configuration, an uplink RA-SDT configuration, and / or a random access configuration. The uplink RA-SDT configuration may include a two-step SDT random access configuration and / or a four-step SDT random access configuration. Similarly, the random access configuration may include a two-step random access configuration and / or a four-step random access configuration.

[0133] In some aspects, the configuration information may include configuration information associated with MT-SDT operations or procedures. For example, the configuration information may indicate resources associated with MT-SDT operations (e.g., downlink resources and / or uplink resources). In some aspects, the configuration information may indicate one or more parameters associated with MT-SDT operations (e.g., power control parameters, timing control parameters, and / or other communication parameters). The configuration information may be associated with at least one of system information signaling, radio resource control signaling, MAC-Ce signaling, and / or downlink control information signaling, etc. In other words, the downlink resource configuration and uplink resource configuration for MT-SDT configuration may be signaled by the network node 110 via SI, RRC, MAC-CE, and / or DCI, etc.

[0134] In some aspects, the configuration information may indicate that PRACH resources (e.g., PRACH preambles) associated with MO-SDT configurations will be associated with MT-SDT operations. For example, the configuration information may indicate that PRACH resources configured for RA-SDT procedures may be shared with PRACH resources configured for MT-SDT procedures.

[0135] In some aspects, the configuration information may include information associated with one or more timers associated with MT-SDT operations (e.g., MT-SDT procedures). The one or more timers may include an SDT timing alignment timer, a session timer for an MT-SDT session, a fault detection timer, an inactivity timer, and / or other SDT-specific timers described herein. Information associated with one or more timers (e.g., the duration of the one or more timers) may be indicated to UE 120 via RRC signaling, MAC-CE signaling, and / or DCI signaling, etc. For example, the one or more timers may be dedicated to UE 120 (e.g., may be specific to UE 120). Therefore, SI signaling may not be used to indicate information associated with one or more timers. In some aspects, the information associated with one or more timers is associated with at least one of: a reference SSB (synchronization and PBCH block) or other downlink reference signal for tracking loops and measurements; a set of thresholds for timer verification; an indication of a timing difference between serving network nodes of UE 120; a message or set of criteria that triggers UE 120 to report auxiliary information, the auxiliary information being used for timing control and / or mobility management and measurement relaxation, etc.

[0136] In some aspects, the configuration information may indicate power control information for uplink communications associated with MT-SDT operations. The power control information may be associated with closed-loop power control and / or open-loop power control. For example, a power control (e.g., closed-loop and / or open-loop) procedure may be supported for uplink transmission of an MT-SDT procedure. Information associated with a power control procedure may be indicated via the configuration information. For example, the power control information may include a power control command. The UE 120 may receive an indication of a power control command via MAC-CE signaling and / or DCI signaling, etc. In some aspects, the configuration information may include open-loop power control information and closed-loop power control information for uplink communications associated with one or more network nodes 120 that support an MT-SDT procedure, an MO-SDT procedure, and / or an RA procedure associated with the UE 120.

[0137] In some aspects, the configuration information may indicate timing control information for uplink communications associated with MT-SDT operations. For example, the configuration information may indicate that a timing control (e.g., closed-loop timing control or open-loop timing control) procedure is supported for uplink transmission of the MT-SDT procedure. For example, the timing control information may include a timing advance command. The UE 120 may receive the timing advance command via MAC-CE signaling or DCI signaling. As another example, the timing control information may include a system frame timing difference (SFTD) between the network node 110 and one or more other network nodes or multiple other network nodes (e.g., between the serving network node 110 of the UE 120 and a neighboring network node 110). The UE 120 may receive an indication of the SFTD via unicast signaling, multicast signaling, and / or broadcast signaling.

[0138] In some aspects, the configuration information may include open-loop timing control information and closed-loop timing control information for DL ​​communications and UL communications associated with one or more network nodes 120 that support MT-SDT procedures, MO-SDT procedures, and / or random access procedures associated with UE 120. In some aspects, the timing control information may include: an indication of a timing advance command; configuration of reference SSBs (synchronization and PBCH blocks) or other DL RSs for tracking loops and measurements; information on timing control associated with multiple serving network nodes of UE 120; a message or set of criteria that triggers the UE to report timing advance information; and / or a message or set of criteria that triggers the UE to report assistance information used for timing control, mobility management, and measurement relaxation, etc.

[0139] In some aspects, the configuration information may include a path loss reference signal configuration. Changes to one or more path loss reference signal configurations associated with MT-SDT operation may be signaled to the UE 120. For example, the UE 120 may receive the path loss reference signal configuration and / or modifications to the path loss reference signal configuration via RRC signaling, MAC-CE signaling, and / or DCI signaling.

[0140] In some aspects, the configuration information indicates a simplified radio resource management (RRM) measurement configuration for MT-SDT operation. The simplified RRM measurement configuration may also be referred to as RRM measurement relaxation. For example, the simplified RRM measurement configuration may be associated with a longer interval between measurements (e.g., a longer interval of a Tdetect parameter, a Tevaluate parameter, and / or a Tmeasure parameter) and / or associated with different thresholds or requirements for co-frequency neighbor cell measurements and / or hetero-frequency neighbor cell measurements, etc. RRM measurement relaxation may enable UE 120 to save power associated with MT-SDT operation. In some aspects, UE 120 may be configured with a simplified RRM measurement configuration based at least in part on sending UAI communications. For example, UAI communications (e.g., as described above in conjunction with reference numeral 805) may indicate mobility information associated with UE 120. In low mobility scenarios and / or when UE 120 is not located near the geographic edge of a cell (e.g., as indicated by UAI communications), UE 120 may be configured with a simplified RRM measurement configuration for MT-SDT.

[0141] In some aspects, the configuration information may indicate simplified downlink control channel monitoring (e.g., PDCCH monitoring) or simplified timeline configuration. For example, the UE 120 may be configured with simplified PDCCH monitoring (e.g., PDCCH skipping and / or search space set group (SSSG) switching) and / or timeline relaxation (cross-slot scheduling using a k0 parameter with a value greater than 1) for MT-SDT procedures. The UE 120 may receive an indication of the simplified downlink control channel monitoring or the simplified timeline configuration via RRC signaling, MAC-CE signaling, and / or DCI signaling. For example, the simplified PDCCH monitoring or timeline relaxation may be configured for the UE 120 (e.g., which is capable of MT-SDT) via RRC signaling, MAC-CE signaling, and / or DCI signaling (e.g., when the UE 120 sends UAI or does not send UAI).

[0142] In some aspects, the configuration information may indicate a semi-persistent scheduling (SPS) or semi-static resource for a downlink channel (e.g., PDSCH) associated with MT-SDT operation, the semi-persistent scheduling (SPS) or semi-static resource being based at least in part on satisfying one or more conditions. For example, due to a change in the mobility state of UE 120 within the RNA of UE 120, the SPS or semi-static resource allocation for PDSCH may not be configured or activated for MT-SDT unless the one or more conditions are met. In some aspects, the SPS or semi-static resource allocation for PDSCH may not be configured or activated for MT-SDT unless all of the one or more conditions are met. In other examples, the SPS or semi-static resource allocation for PDSCH may not be configured or activated for MT-SDT unless a specific number or a specific combination of conditions are met.

[0143] The one or more conditions associated with the SPS or semi-static resource allocation for PDSCH configured or activated for MT-SDT may include a first condition associated with whether an uplink communication is successfully sent by the UE 120 and / or successfully received by the UE 120. For example, the first condition may be satisfied if an RRC resume request communication (e.g., an RRC resume request in response to a paging communication that triggers MT-SDT operation) sent by the UE 120 is received by the network node 110. The one or more conditions associated with the SPS or semi-static resource allocation for PDSCH configured or activated for MT-SDT may include a second condition associated with whether mobility information and a link state associated with the UE 120 are reported to the network node 110. For example, the second condition may be satisfied if the UE 120 sends a mobility state and a link quality to the network node 110 (e.g., indicating that the UE 120 is associated with low mobility and is not located at a cell edge). For example, if the mobility state of UE 120 indicates high mobility and / or the link quality (eg, RSRP measurement) is less than a cell edge threshold, the second condition may not be met.

[0144] The one or more conditions associated with SPS or semi-static resource allocation for PDSCH configured or activated for MT-SDT may include a third condition associated with whether a paging communication and any subsequent downlink communication associated with MT-SDT operation is received from the network node 110 (e.g., not another network node 110). For example, the third condition may be satisfied if a paging indication for MT-SDT, an MT-SDT message, and a subsequent downlink message are sent by the (same) network node 110. The one or more conditions associated with SPS or semi-static resource allocation for PDSCH configured or activated for MT-SDT may include a fourth condition associated with whether a measured value of a downlink reference signal (e.g., a reference SSB or another reference signal) satisfies an SPS threshold (e.g., RSRPThreshold-sps). For example, the fourth condition may be associated with the RSRP of the downlink path loss reference signal satisfying a pre-configured RSRPThreshold-sps threshold (e.g., the threshold indicated by the network node 110 to the UE 120).

[0145] The one or more conditions associated with SPS or semi-static resource allocation for PDSCH configured or activated for MT-SDT may include a fifth condition associated with whether UE 120 is configured with uplink resources (e.g., valid uplink resources) to provide HARQ feedback associated with MT-SDT operation, which occurs before the SDT timing alignment timer and / or HARQ RTT expires. For example, if UE 120 is configured with valid uplink resources to send HARQ feedback and subsequent downlink messages for MT-SDT before the SDT specific timing alignment timer expires, the fifth condition may be satisfied. The SDT specific timing alignment timer may control the amount of time that the timing alignment between UE 120 and network node 110 is valid (e.g., after UE 120 receives an RRC release communication with SuspendConfig). The one or more conditions associated with the SPS or semi-static resource allocation for PDSCH configured or activated for MT-SDT may include a sixth condition associated with whether the SDT timer has expired, which is started after the initial transmission of the MT-SDT operation. The SDT timer may be referred to as an SDT error detection timer. The SDT timer may control the duration of the MT-SDT operation and may be started after the UE 120 receives the initial transmission or reception associated with the MT-SDT operation. If the SDT timer has not expired, the sixth condition may be met. If the time has expired, the sixth condition may not be met. The one or more conditions associated with the SPS or semi-static resource allocation for PDSCH configured or activated for MT-SDT may include a seventh condition associated with whether the serving network node for SPS or semi-static MT-SDT communication is a network node in the RNA of the UE, from which the UE receives an RRC release message and transitions to an RRC inactive state to perform the MT-SDT procedure.

[0146] UE 120 may configure itself based at least in part on the configuration information.In some aspects, UE 120 may be configured to perform one or more operations described herein based at least in part on the configuration information.

[0147] As shown by reference numeral 815, the network node 110 may send an RRC release communication (e.g., using the communication manager 150, the transmission component 1204, the controller / processor 240, the transmission processor 220, the TX MIMO processor 230, the MOD 232, the antenna 234 and / or the memory 242), and the UE 120 may receive the RRC release communication (e.g., using the communication manager 140, the receiving component 1102, the antenna 252, the DEMOD 254, the MIMO detector 256, the receiving processor 258, the controller / processor 280 and / or the memory 282). The RRC release communication may be an RRC release communication with SuspendConfig. As described in more detail elsewhere herein, the RRC release communication may indicate one or more MO-SDT configurations, such as an uplink CG-SDT configuration and / or an uplink RA-SDT configuration, etc. In some aspects, the RRC release communication may indicate some or all of the above configuration information. The network node 110 that sends the RRC release communication may be referred to herein as the “anchor” network node 110 for the UE 120 .

[0148] As shown by reference numeral 820, UE 120 may transition to RRC inactive mode based at least in part on receiving an RRC release communication. For example, for the operations described below, UE 120 may operate in RRC inactive mode. In some aspects, for the operations described below, UE 120 may operate in RRC idle mode.

[0149] As shown by reference numeral 825, the UE 120 may receive (e.g., using the communication manager 140, the receiving component 1102, the antenna 252, the DEMOD 254, the MIMO detector 256, the receiving processor 258, the controller / processor 280, and / or the memory 282) an indication that the UE 120 will perform MT-SDT operations (e.g., MT-SDT operations), and the network node 110 (or another network node 110) may send an indication that the UE 120 will perform MT-SDT operations (e.g., MT-SDT operations). For example, the indication that the UE 120 will perform MT-SDT operations may be included in a paging signal. For example, the paging signal may include an SDT indication (e.g., an indication that the MT-SDT operation will be performed). For example, the paging signal may indicate to the UE 120 that the network node 110 has downlink data to send to the UE 120. The SDT indication may indicate that the UE 120 is to perform MT-SDT operations to receive downlink data (e.g., indicating that the UE 120 is to remain in an RRC inactive mode while receiving downlink data). The network node 110 that sends the paging signal may be referred to herein as a “serving” network node 110. In some aspects, the anchor network node 110 and the serving network node 110 may be the same network node 110 (or may be associated with the same DU or CU). In other aspects, the anchor network node 110 and the serving network node 110 may be different network nodes 110.

[0150] As shown by reference numeral 830, the UE 120 may select (e.g., using the communication manager 140, the resource selection component 1108, the controller / processor 280, and / or the memory 282) one or more uplink resources to be used by the UE 120 to send uplink communications associated with MT-SDT operations. For example, the uplink communications may include an RRCResumeRequest communication, an indication of a UE identifier of the UE 120, one or more uplink communications (e.g., a MO-SDT communication, a UAI, a MAC-CE including a BSR, a power headroom report (PHR), and / or a channel state information (CSI) report), and / or an uplink response to a downlink communication (e.g., a UCI and / or a MAC-CE), etc.

[0151] For example, as described above, UE 120 may be configured with CG-SDT resources, such as CG PUSCH resources, DMRS resources, and / or physical uplink control channel (PUCCH) resources, etc. Additionally or alternatively, UE 120 may be configured with RA-SDT resources, such as resources for msg1 / msg3 of a four-step RACH procedure, resources for msgA / msg3 fallback of a two-step RACH procedure, and / or PUCCH resources, etc. Additionally or alternatively, UE 120 may be configured with resources for a RACH procedure (e.g., a non-SDT RACH procedure). In some aspects, PRACH resources supporting a two-step RACH procedure (RA-SDT and / or non-SDT RACH) and a four-step RACH procedure (RA-SDT and / or non-SDT RACH) may be shared or may be configured separately for UE 120. UE 120 may select resources from the CG-SDT resources. The RA-SDT resources or RACH procedure resources are based at least in part on whether one or more conditions are met.

[0152] In some aspects, the UE 120 may select a first uplink resource associated with a MO-SDT configuration (e.g., CG-SDT or RA-SDT) based at least in part on satisfying the one or more conditions. The UE 120 may select a second uplink resource associated with a random access configuration based at least in part on not satisfying the one or more conditions or at least in part on not configuring the MO-SDT configuration for the UE 120. In some aspects, the UE 120 may select a resource to be associated with an MT-SDT operation from a CG-SDT (e.g., a CG MO-SDT configuration) based at least in part on satisfying a first one or more conditions of the one or more conditions. The UE 120 may select a resource to be associated with an MT-SDT operation from a RA-SDT (e.g., a random access SDT configuration) based at least in part on not satisfying the first one or more conditions and at least in part on satisfying a second one or more conditions of the one or more conditions. The UE 120 may select a resource to be associated with an MT-SDT operation from a random access configuration based at least in part on not satisfying the first one or more conditions and the second one or more conditions. In some aspects, UE 120 may select resources to be associated with MT-SDT operation from the random access configuration based at least in part on satisfying the third one or more conditions.

[0153] In other words, UE 120 may first attempt to select uplink resources from the CG-SDT configuration. If UE 120 cannot select resources from the CG-SDT configuration (or if UE 120 is not configured with the CG-SDT configuration), UE 120 may attempt to select uplink resources from the RA-SDT configuration. If UE 120 cannot select resources from the RA-SDT configuration (or if UE 120 is not configured with the RA-SDT configuration), UE 120 may attempt to select uplink resources from a random access configuration (e.g., a non-SDT random access configuration).

[0154] For example, if CG-SDT resources are configured on the uplink for transmission for UE 120 in RRC idle mode in RRC inactive mode, then if the first one or more conditions are met, the CG-SDT resources will be selected by UE 120 performing MT-SDT. For example, the first one or more conditions associated with selecting resources from the CG-SDT configuration may include a first condition associated with whether the network node 110 is a serving network node from which the UE 120 receives an RRC communication (e.g., an RRC release communication with SuspendConfig) that causes the UE 120 to transition to RRC inactive mode. For example, the first condition may be associated with whether the serving network node selected by the UE 120 for an SDT (e.g., MO-SDT, MT-SDT, or a combination of MO-SDT and MT-SDT) procedure is a serving network node from which the UE 120 receives an RRC release message that causes the UE 120 to transition to RRC inactive mode. In other words, the first condition may be associated with whether a paging indication for MT-SDT (e.g., as described above in conjunction with reference numeral 825), an MT-SDT message, and subsequent downlink control and / or data messages are sent by the network node 110 from which the UE receives an RRC release (e.g., as described above in conjunction with reference numeral 815) and transitions to the RRC inactive mode to perform the MT-SDT procedure. For example, if the UE 120 receives an RRC release communication with SuspendConfig and paging signaling that triggers the MT-SDT procedure from the same network node 110, the first condition may be satisfied. If the UE 120 receives an RRC release communication with SuspendConfig and paging signaling that triggers the MT-SDT procedure from different network nodes 110, the first condition may not be satisfied.

[0155] The first one or more conditions associated with selecting resources from the CG-SDT configuration may include a second condition associated with whether a CG MO-SDT configuration is received from a serving network node. For example, the second condition may be associated with whether the CG-SDT resources for the UE are configured by a network node 110, and the UE receives an RRC release (e.g., as described above in conjunction with reference number 815) from the network node and transitions to an RRC inactive mode to perform MT-SDT procedures. The second condition may be satisfied if the UE 120 receives configuration of CG-SDT resources and an RRC release communication with SuspendConfig from the same network node 110. The second condition may not be satisfied if the UE 120 receives configuration of CG-SDT resources and an RRC release communication with SuspendConfig from different network nodes 110.

[0156] The first one or more conditions associated with selecting resources from the CG-SDT configuration may include a third condition associated with whether the amount of data of pending uplink data across all SDT radio bearers satisfies one or more uplink data volume thresholds (e.g., DataVolumeThreshold-cg-PUSCH). For example, the third condition may be associated with whether the amount of data of pending uplink data across all SDT radio bearers satisfies a set of uplink data volume thresholds associated with MO-SDT and / or MT-SDT. For example, the third condition may be associated with whether the amount of data of pending UL data across all SDT radio bearers is less than or equal to a pre-configured DataVolumeThreshold-cg-PUSCH indicated by the serving network node 110. If the amount of data satisfies the uplink data volume threshold, the third condition may be satisfied. If the amount of data does not satisfy the uplink data volume threshold, the third condition may not be satisfied.

[0157] The first one or more conditions associated with selecting resources from the CG-SDT configuration may include a fourth condition associated with whether a measured value of a downlink reference signal (e.g., a reference SSB or another reference signal) satisfies one or more uplink CG thresholds (e.g., RSRPThreshold-cg-PUSCH). For example, the fourth condition may be associated with whether the measured value of the downlink reference signal satisfies a threshold set for link quality assessment, the threshold set being associated with MO-SDT and / or MT-SDT. For example, the fourth condition may be associated with whether the RSRP of the downlink path loss reference signal is greater than or equal to a pre-configured RSRPThreshold-cg-PUSCH indicated by the serving network node 110. The UE 120 may measure the RSRP of the downlink path loss reference signal via measuring an SSB, a CSI reference signal (CSI-RS), a tracking reference signal (TRS), a positioning reference signal (PRS), a received signal strength (RSS), a wake-up signal, a low-power wake-up signal, and / or another downlink reference signal sent by the serving network node 110. If the RSRP of the downlink reference signal satisfies the uplink CG threshold, the fourth condition may be satisfied. If the RSRP of the downlink reference signal does not satisfy the uplink CG threshold, the fourth condition may not be satisfied.

[0158] The first one or more conditions associated with selecting resources from the CG-SDT configuration may include a fifth condition associated with whether the SDT timing alignment timer expires. For example, the fifth condition may be associated with whether the SDT timing alignment timer, or the HARQ round trip time (RTT) timer, or a combination thereof expires. For example, the fifth condition may be associated with whether the SDT specific timing alignment timer is valid before the initial transmission and retransmission of the CG-SDT communication. The SDT timing alignment timer may be associated with the amount of time that the timing alignment between the UE 120 and the network node 110 (e.g., the serving network node 110) is valid. The SDT timing alignment timer may be started by the UE 120 after the UE 120 receives the RRC release communication. For example, if the SDT timing alignment timer has not expired, the fifth condition may be met. If the SDT timing alignment timer expires, the fifth condition may not be met.

[0159] The first one or more conditions associated with selecting resources from the CG-SDT configuration may include a sixth condition associated with whether the radio resources (e.g., time domain resources, frequency domain resources, space domain resources and / or code domain resources) associated with the resources selected from the CG-SDT configuration at least partially overlap with the radio resources of another communication, which has a higher priority than the uplink communication (e.g., CG-SDT communication). For example, the sixth condition may be associated with whether any CG-SDT transmission overlaps or conflicts with other prioritized uplink channels or signal transmissions (e.g., PRACH transmissions or PUCCH transmissions) or downlink channels or signal receptions (e.g., SSB, SI and / or paging) (e.g., in the time domain). The sixth condition may be satisfied if the time domain resources associated with the resources selected from the CG-SDT configuration do not overlap with the time domain resources of another communication (e.g., CG-SDT communication) having a higher priority than the uplink communication. The sixth condition may not be satisfied if the time domain resources associated with the resources selected from the CG-SDT configuration at least partially overlap with the time domain resources of another communication (eg, CG-SDT communication) having a higher priority than the uplink communication.

[0160] In some aspects, UE 120 may select uplink resources from the CG-SDT configuration only if the first condition, the second condition, the third condition, the fourth condition, the fifth condition, and the sixth condition described above are met. In other words, if any of the above conditions is not met, UE 120 may not select uplink resources from the CG-SDT configuration for MT-SDT operation. In other aspects, if the number of conditions met meets a threshold, UE 120 may select uplink resources from the CG-SDT configuration for MT-SDT operation. For another example, if a specific combination of conditions is met, UE 120 may select uplink resources from the CG-SDT configuration for MT-SDT operation.

[0161] If CG-SDT resources are not configured on UE 120, or CG-SDT resources are configured but UE 120 does not select them for CG PUSCH transmission (i.e., because the first one or more conditions described above are not met), UE 120 may attempt to select RA-SDT resources for performing MT-SDT operations. For example, if RA-SDT resources are configured on the uplink for UE 120 in RRC inactive mode or RRC idle mode for MO-SDT transmission, UE 120 may select RA-SDT resources for performing MT-SDT operations if the second one or more conditions are met.

[0162] For example, the second one or more conditions associated with selecting resources from the RA-SDT configuration may include a first condition associated with one or more network nodes from which the UE 120 receives an indication that the UE will perform MT-SDT operations (e.g., a paging signal as described above in conjunction with reference numeral 825), an RRC communication that causes the UE 120 to transition to an RRC inactive mode (e.g., an RRC release communication described above in conjunction with reference numeral 815), and a RA-SDT configuration, the one or more network nodes being included in an RNA associated with the UE 120. For example, the first condition may be associated with one or more network nodes within the RNA of the UE 120 from which the UE 120 receives an indication that the UE 120 will receive an MT-SDT message, an RRC release message that causes the UE 120 to transition to an RRC inactive mode to perform an MT-SDT procedure, configuration for MT-SDT and RA-SDT, and subsequent downlink and uplink communications associated with the configured MT-SDT and RA-SDT procedures. In other words, UE 120 may receive an RRC release communication from the anchor network node, may receive a paging signal from the last serving network node, and may receive a RA-SDT configuration from the serving network node. The anchor network node, the last serving network node, and the serving network node may be the same network node 110 or may be different network nodes 110. The first condition may be associated with whether the anchor network node, the last serving network, and the serving network node are all geographically located within the RNA of UE 120. For example, if the anchor network node, the last serving network, and the serving network node are all geographically located within the RNA of UE 120, the first condition may be satisfied. If at least one of the anchor network node, the last serving network, or the serving network node is not geographically located within the RNA of UE 120, the first condition may not be satisfied.

[0163] The second one or more conditions associated with selecting resources from the RA-SDT configuration may include a second condition associated with whether the amount of data of pending uplink data across all SDT radio bearers satisfies one or more uplink data volume thresholds (e.g., DataVolumeThreshold-ra-sdt). For example, the second condition may be associated with whether the amount of data of pending uplink data across all SDT radio bearers satisfies a set of uplink data volume thresholds configured for MT-SDT and / or RA-SDT, and so on. For example, the second condition may be associated with whether the amount of data of pending UL data across all SDT radio bearers is not greater than a pre-configured DataVolumeThreshold-ra-sdt indicated by the network node 110 (e.g., indicated by the serving network node). If the amount of data satisfies the uplink data volume threshold, the second condition may be satisfied. If the amount of data does not satisfy the uplink data volume threshold, the second condition may not be satisfied.

[0164] The second one or more conditions associated with selecting resources from the RA-SDT configuration may include a third condition associated with whether a measured value of a downlink reference signal (e.g., an SSB or another reference signal) satisfies one or more random access SDT thresholds (e.g., RSRPThreshold-ra-sdt). For example, the third condition may be associated with whether the measured value of the downlink reference signal satisfies a threshold set for link quality assessment, the threshold set being associated with MT-SDT and / or RA-SDT, and the like. For example, the third condition may be associated with whether the RSRP of the downlink path loss reference signal is greater than or equal to a pre-configured RSRPThreshold-ra-sdt indicated by the serving network node 110. The UE 120 may measure the RSRP of the downlink path loss reference signal via measuring an SSB, a CSI-RS, a TRS, a PRS, an RSS, a wake-up signal, a low-power wake-up signal, and / or another downlink reference signal sent by the serving network node 110. The third condition may be satisfied if the RSRP of the downlink reference signal satisfies the random access SDT threshold. If the RSRP of the downlink reference signal does not satisfy the random access SDT threshold, the third condition may not be satisfied.

[0165] The second one or more conditions associated with selecting resources from the RA-SDT configuration may include a fourth condition associated with whether the radio resources associated with the uplink resources selected from the RA-SDT configuration overlap at least partially with the radio resources of another communication, the other communication having a higher priority than the RA-SDT communication. For example, the fourth condition may be associated with whether the radio resources associated with MT-SDT and RA-SDT overlap with the radio resources of another communication having a higher priority than the SDT communication. For example, the fourth condition may be associated with whether the RA-SDT transmission overlaps or conflicts with other prioritized uplink channels or signal transmissions or downlink channels or signal receptions (e.g., SSB, SI, or paging) (e.g., in the time domain). For example, if the time domain resources associated with the resources selected from the RA-SDT configuration do not overlap with the time domain resources of another communication (e.g., RA-SDT communication) having a higher priority than the uplink communication, the fourth condition may be satisfied. The fourth condition may not be satisfied if time domain resources associated with the resources selected from the RA-SDT configuration at least partially overlap with time domain resources of another communication (eg, RA-SDT communication) having a higher priority than the uplink communication.

[0166] In some aspects, UE 120 may select uplink resources from the RA-SDT configuration only if the first, second, third, and fourth conditions described above are met. In other words, if any of the above conditions are not met, UE 120 may not select uplink resources from the RA-SDT configuration for MT-SDT operation. In other aspects, if the number of conditions met meets a threshold, UE 120 may select uplink resources from the RA-SDT configuration for MT-SDT operation. For another example, if a specific combination of conditions is met, UE 120 may select uplink resources from the RA-SDT configuration for MT-SDT operation.

[0167] If the CG-SDT resources and the RA-SDT resources are not available (e.g., not configured, not selected, or invalid) to the UE 120, the UE 120 may attempt to select an uplink resource configured for a RACH procedure (e.g., a four-step RACH procedure or a two-step RACH procedure) that may be selected by the UE for performing the MT-SDT procedure. In some aspects, the UE 120 may select an uplink resource from a random access configuration (e.g., a non-SDT random access configuration) based at least in part on satisfying a third one or more conditions.

[0168] The satisfied third one or more conditions associated with selecting resources from the random access configuration may include a first condition associated with one or more network nodes from which the UE 120 receives an indication that the UE will perform MT-SDT operations (e.g., a paging signal as described above in conjunction with reference numeral 825), RRC communications that cause the UE 120 to transition to an RRC inactive mode (e.g., an RRC release communication described above in conjunction with reference numeral 815), and the random access configuration, the one or more network nodes being included in an RNA associated with the UE 120. For example, the first condition may be associated with one or more network nodes within the RNA of the UE 120 from which the UE 120 receives an indication that the UE 120 will receive an MT-SDT message for MT-SDT operations, an RRC release message that causes the UE 120 to transition to an RRC inactive mode to perform MT-SDT operations, configuration for random access and MT-SDT, and subsequent downlink and / or uplink communications associated with the configured MT-SDT and RA procedures. In other words, UE 120 may receive an RRC release communication from the anchor network node, may receive a paging signal from the last serving network node, and may receive a random access configuration from the serving network node. The anchor network node, the last serving network node, and the serving network node may be the same network node 110 or may be different network nodes 110. The first condition may be associated with whether the anchor network node, the last serving network, and the serving network node are all geographically located within the RNA of UE 120. For example, if the anchor network node, the last serving network, and the serving network node are all geographically located within the RNA of UE 120, the first condition may be satisfied. If at least one of the anchor network node, the last serving network, or the serving network node is not geographically located within the RNA of UE 120, the first condition may not be satisfied.

[0169] The satisfied third one or more conditions associated with selecting a resource from the random access configuration may include a second condition associated with whether a measured value of a downlink reference signal (e.g., an SSB or another reference signal) satisfies one or more SDT thresholds (e.g., RSRPThreshold-sdt). For example, the second condition may be associated with whether the measured value of the downlink reference signal satisfies a threshold set for link quality assessment, the threshold set being associated with MT-SDT and / or a random access procedure, etc. For example, the second condition may be associated with whether the RSRP of a downlink path loss reference signal is greater than or equal to a pre-configured RSRPThreshold-sdt indicated by the serving network node 110. The UE 120 may measure the RSRP of the downlink path loss reference signal via measuring an SSB, a CSI-RS, a TRS, a PRS, an RSS, a wake-up signal, a low-power wake-up signal, and / or another downlink reference signal sent by the serving network node 110. The second condition may be satisfied if the RSRP of the downlink reference signal satisfies the SDT threshold. If the RSRP of the downlink reference signal does not satisfy the SDT threshold, the second condition may not be satisfied.

[0170] The third one or more conditions that are satisfied associated with selecting resources from the random access configuration may include a third condition associated with whether the radio resources associated with the uplink resources associated with the random access configuration overlap at least partially with the radio resources of another communication that has a higher priority than the random access communication. For example, the third condition may be associated with whether the random access transmission overlaps or conflicts with other prioritized uplink channels or signal transmissions or downlink channels or signal receptions (e.g., SSB, SI, or paging) (e.g., in the time domain). For example, if the time domain resources associated with the resources selected from the random access configuration do not overlap with the time domain resources of another communication (e.g., random access communication) that has a higher priority than the uplink communication, the third condition may be satisfied. If the time domain resources associated with the resources selected from the random access configuration overlap at least partially with the time domain resources of another communication (e.g., random access communication) that has a higher priority than the uplink communication, the third condition may not be satisfied.

[0171] In some aspects, UE 120 may select uplink resources from the random access configuration only if the first condition, the second condition, and the third condition described above are met. In other words, if any of the above conditions is not met, UE 120 may not select uplink resources from the random access configuration for MT-SDT operation. In other aspects, if the number of conditions met meets a threshold, UE 120 may select uplink resources from the random access configuration for MT-SDT operation. For another example, if a specific combination of conditions is met, UE 120 may select uplink resources from the random access configuration for MT-SDT operation. If UE 120 cannot select resources from a CG-SDT configuration, a RA-SDT configuration, or a random access configuration, UE 120 may terminate or suspend MT-SDT operation.

[0172] As shown by reference numeral 835, the UE 120 may use the uplink resources selected by the UE 120 to send a response (e.g., a response to the paging signal) (e.g., using the communication manager 140, the transmission component 1104, the controller / processor 280, the transmission processor 264, the TX MIMO processor 266, the MOD 254, the antenna 252 and / or the memory 282), and the network node 110 may use the uplink resources selected by the UE 120 to receive the response (e.g., a response to the paging signal) (e.g., as described in more detail elsewhere herein). For example, the response may be an uplink communication. In some aspects, the response may be or may be included in an RRC recovery request communication. In some aspects, the UE 120 may send the response based on configuration information (e.g., power control information or timing control information, etc., as described in more detail elsewhere herein). Additionally or alternatively, the response may include additional information associated with the SDT procedure, as described in more detail elsewhere herein. For example, the response may be a CG communication (e.g., if resources in a CG-SDT configuration are selected). For another example, the response may be a RA-SDT communication (e.g., if resources in a RA-SDT configuration are selected). For another example, the response may be a RACH communication (e.g., if resources in a random access configuration are selected).

[0173] As shown by reference numeral 840, the network node 110 may transmit downlink communications (e.g., MT-SDT communications) (e.g., using the communication manager 150, the transmit component 1204, the controller / processor 240, the transmit processor 220, the TX MIMO processor 230, the MOD 232, the antenna 234, and / or the memory 242), and the UE 120 may receive the downlink communications (e.g., MT-SDT communications) (e.g., using the communication manager 140, the receive component 1102, the antenna 252, the DEMOD 254, the MIMO detector 256, the receive processor 258, the controller / processor 280, and / or the memory 282). In some aspects, the UE 120 may transition to an RRC idle mode, an RRC inactive mode, or an RRC connected mode based at least in part on the downlink communications. As shown by reference numeral 845, UE 120 may send MO-SDT communications (e.g., in response to MT-SDT communications), and network node 110 may receive MO-SDT communications (e.g., in response to MT-SDT communications). In other words, an SDT session may be initiated for MT-SDT operations based at least in part on UE 120 selecting uplink resources and sending responses. After successfully completing the MT-SDT session, UE 120 may be configured or instructed to transition to RRC idle mode (e.g., via RRCRelease), RRC inactive mode (e.g., via RRCRelease or RRCReject), or RRC connected mode (e.g., via RRCResume or RRCSetup).

[0174] In some aspects, the MT-SDT session may be terminated by the network (e.g., network node 110) or UE 120. For example, early termination of the MT-SDT session may be initiated by the network and / or UE 120. For example, as shown by reference numeral 850, UE 120 may detect a termination event. UE 120 may terminate the session based at least in part on detecting the termination event. For example, detecting the termination event may include: detecting that an SDT inactivity timer has expired before detecting or decoding a downlink control communication associated with MT-SDT operation. For example, UE 120 may terminate the session based at least in part on not detecting any PDCCH communication or failing to decode any PDCCH communication before expiration of an SDT specific inactivity timer (e.g., where the SDT specific inactivity timer may be configured by an anchor network node or a serving network node via SI signaling, RRC signaling, and / or MAC-CE signaling).

[0175] Additionally or alternatively, detecting the termination event may include: detecting that a measurement value of a downlink signal (e.g., an SSB or another reference signal) does not satisfy an SDT measurement value threshold. For example, the UE 120 may terminate the session based at least in part on an RSRP measurement of a downlink path loss reference being less than an SDT specific RSRP threshold (e.g., which is configured by an anchor network node or a serving network node via SI signaling, RRC signaling, and / or MAC-CE signaling). Additionally or alternatively, detecting the termination event may include: detecting that an SDT timing alignment timer and / or HARQ RTT has expired before the UE 120 sends feedback information for downlink communications associated with MT-SDT operations. For example, the UE 120 may terminate the session based at least in part on the expiration of a timing alignment timer before the UE 120 sends HARQ feedback to a PDSCH of an MT-SDT communication or other downlink message from a serving network node during the session.

[0176] Additionally or alternatively, detecting the termination event may include: selecting another network node to be associated with MT-SDT operation, and detecting a failure associated with the other network node obtaining context information associated with the UE. For example, the UE 120 may terminate the session based at least in part on the UE 120 reselecting another network node, wherein the other network node is unable to obtain the UE context information of the UE 120 from the last serving network node. Additionally or alternatively, detecting the termination event may include: detecting that the geographic location of the UE 120 is outside the RNA associated with the MT-SDT operation. For example, the UE 120 may terminate the session based at least in part on the UE 120 moving out of the RNA or if any network node in the RNA supporting MT-SDT cannot reach the UE 120.

[0177] Additionally or alternatively, detecting the termination event may include receiving a system information communication or an emergency notification communication (e.g., an earthquake and tsunami warning system (ETWS) communication or a commercial mobile alert system (CMAS) communication) that at least partially overlaps with a downlink communication associated with the session in the time domain. For example, UE 120 may terminate the session based at least in part on receiving a paging message for SI modification, ETWS communication, and / or CMAS communication, etc., which conflicts with one or more PDCCH and / or PDSCH receptions of the session (e.g., at least partially overlaps in the time domain).

[0178] Additionally or alternatively, detecting the termination event may include detecting that an SDT fault detection timer has expired. For example, UE 120 may terminate the session based at least in part on the expiration of the SDT fault detection timer, wherein the SDT specific fault detection timer may be configured by the anchor network node or the serving network node via SI signaling, RRC signaling, and / or MAC-CE signaling. Additionally or alternatively, detecting the termination event may include detecting that the number of PRACH preamble transmissions performed by UE 120 meets a threshold. For example, UE 120 may terminate the session based at least in part on a MAC entity of UE 120 detecting that the number of PRACH preamble transmissions performed by UE 120 meets a configured maximum PRACH preamble transmission threshold. Additionally or alternatively, detecting the termination event may include detecting that the number of retransmissions performed by UE 120 meets a threshold. For example, UE 120 may terminate the session based at least in part on an RLC entity of UE 120 detecting that the number of retransmissions performed by UE 120 (or an RLC entity) meets a configured maximum retransmission threshold.

[0179] Additionally or alternatively, detecting the termination event may include detecting that a response to an uplink communication (e.g., an initial PUSCH communication) has not been received by the UE 120. For example, the UE 120 may terminate the session based at least in part on not receiving a response from the network after an initial PUSCH transmission of the session. For example, the UE 120 may terminate the session based at least in part on not receiving a response to a UE communication for an RRC resume request (e.g., which may be mandatory for MT-SDT), a common control channel (CCCH) message (e.g., which may be mandatory for MO-SDT), and / or a random access message carrying an indication of the identity of the UE 120 (e.g., which may be mandatory for contention resolution of RA), etc. Additionally or alternatively, detecting the termination event may include detecting that a power headroom of the UE 120 does not satisfy an SDT power headroom threshold. For example, UE 120 may terminate the session based at least in part on a power headroom of UE 120 being less than or equal to an SDT-specific threshold (eg, configured by the anchor network node or the serving network node via RRC signaling and / or MAC-CE signaling).

[0180] In some aspects, based at least in part on terminating the session early, UE 120 may send a communication indicating that the session has been terminated, and network node 110 may receive a communication indicating that the session has been terminated. In some aspects, as shown by reference numeral 855, UE 120 may receive an RRC release communication (e.g., that it terminates the session), and network node 110 may send an RRC release communication (e.g., that it terminates the session).

[0181] Thus, use conditions for various MO-SDT configurations for responding to paging communications that trigger MT-SDT procedures may be defined. This may improve efficiency in resource utilization because UE 120 may be enabled to respond to paging communications that trigger MT-SDT procedures using resources configured for the MO-SDT procedures (e.g., thereby eliminating the need to configure or allocate additional resources for the MT-SDT procedures). Additionally, this may reduce signaling overhead, latency, and / or power consumption that would otherwise be associated with the MT-SDT procedures due to configuration and / or use of additional resources (e.g., to be used by UE 120 to respond to paging communications). Furthermore, by defining the use of various MO-SDT configurations to be used when different network nodes 110 trigger MT-SDT operations, this may improve mobility and enhance wireless communication coverage for SDT reception and / or transmission.

[0182] As indicated above, Figure 8 are provided as examples. Other examples can be found in relation to Figure 8 The examples described are different.

[0183] Fig. 9 is a diagram illustrating an example process 900, performed, for example, by a UE, according to the present disclosure. Example process 900 is an example of operations in which a UE (eg, UE 120) performs resource configuration and selection for downlink SDT.

[0184] like Fig. 9 As shown, in some aspects, process 900 may include receiving an indication from a network node that the UE is to perform MT-SDT operations (block 910). Fig.11 The depicted communications manager 140 and / or receiving component 1102) can receive an indication from a network node that the UE is to perform MT-SDT operations, as described above.

[0185] like Fig. 9 As shown, in some aspects, process 900 may optionally include: selecting resources to be used for the MT-SDT operation from the MO-SDT configuration or the random access configuration (block 920). Fig.11The depicted communication manager 140 and / or resource selection component 1108) may select resources to be used for the MT-SDT operation from a MO-SDT configuration or a random access configuration. For example, the UE may determine whether a first one or more conditions are met. If the first one or more conditions are met (e.g., "yes"), the UE may select one or more resources from a CG-SDT configuration for the MT-SDT operation. If the first one or more conditions are not met (e.g., "no"), the UE may determine whether a second one or more conditions are met. If the second one or more conditions are met (e.g., "yes"), the UE may select one or more resources from a RA-SDT configuration for the MT-SDT operation. If the second one or more conditions are not met (e.g., "no"), the UE may select one or more resources from a random access (e.g., RACH) configuration.

[0186] like Fig. 9 As further shown, in some aspects, process 900 may include, in response to the indication, sending a communication to the network node using: a first uplink resource associated with a MO-SDT configuration for use based at least in part on satisfying one or more conditions, or a second uplink resource associated with a random access configuration for use based at least in part on not satisfying the one or more conditions or based at least in part on not configuring a MO-SDT configuration for the UE (block 930). For example, the UE (e.g., using Fig.11 The depicted communication manager 140 and / or sending component 1104) may, in response to the indication, send communications to the network node using: a first uplink resource associated with a MO-SDT configuration (e.g., the CG-SDT configuration or the RA-SDT configuration) that is used based at least in part on satisfying one or more conditions (e.g., the first one or more conditions and / or the second one or more conditions), or a second uplink resource associated with a random access configuration that is used based at least in part on not satisfying the one or more conditions or at least in part on not configuring the MO-SDT configuration for the UE, as described above.

[0187] Process 900 may include additional aspects, such as any single aspect or any combination of aspects described below and / or in conjunction with one or more other processes described elsewhere herein.

[0188] In a first aspect, the UE operates in an RRC idle mode or an RRC inactive mode. In a second aspect, alone or in combination with the first aspect, the indication that the UE will perform the MT-SDT operation is included in a paging signal. In a third aspect, alone or in combination with one or more of the first and second aspects, the communication is included in an RRC recovery request communication. In a fourth aspect, alone or in combination with one or more of the first to third aspects, the MT-SDT operation is associated with a downlink SDT operation, and wherein the MO-SDT configuration is associated with an uplink SDT configuration.

[0189] In a fifth aspect, alone or in combination with one or more of the first to fourth aspects, the MO-SDT configuration includes at least one of a CG-SDT configuration or a RA-SDT configuration.

[0190] In the sixth aspect, alone or in combination with one or more of the first to fifth aspects, the MO-SDT configuration includes a CG-SDT configuration or a random access SDT configuration, and wherein the communication is associated with: the CG-SDT configuration associated with the communication based at least in part on satisfying a first one or more of the one or more conditions, the RA-SDT configuration associated with the communication based at least in part on not satisfying the one or more conditions and at least in part on satisfying a second one or more of the one or more conditions, or the random access configuration associated with the communication based at least in part on not satisfying the first one or more conditions and the second one or more conditions.

[0191] In the seventh aspect, alone or in combination with one or more of the first to sixth aspects, the first one or more conditions include at least one of the following: a first condition, which is associated with whether the network node is a serving network node, and the UE receives an RRC release communication from the serving network node that causes the UE to transition to RRC inactive mode; a second condition, which is associated with whether the CG-SDT configuration is received from the serving network node; a third condition, which is associated with whether the amount of pending uplink data across all SDT radio bearers satisfies one or more uplink data amount thresholds; a fourth condition, which is associated with whether the measured value of the downlink reference signal satisfies one or more uplink CG thresholds; a fifth condition, which is associated with whether the SDT timing alignment timer or HARQ RTT expires; or a sixth condition, which is associated with whether the radio resources associated with the first uplink resources at least partially overlap with the radio resources of another communication, and the other communication has a higher priority than the communication.

[0192] In the eighth aspect, alone or in combination with one or more of the first to seventh aspects, the second one or more conditions include at least one of the following: a first condition, the first condition is associated with one or more network nodes, the one or more network nodes include the network node, the UE receives the indication that the UE will perform the MT-SDT operation, the RRC release communication that causes the UE to transition to RRC inactive mode, and the random access SDT configuration from the network node, and the network node is included in the RNA associated with the UE; a second condition, the second condition is associated with whether the amount of pending uplink data across all SDT radio bearers satisfies one or more uplink data amount thresholds; a third condition, the third condition is associated with whether the measured value of the downlink reference signal satisfies one or more random access SDT thresholds; or a fourth condition, the fourth condition is associated with whether the radio resources associated with the first uplink resources at least partially overlap with the radio resources of another communication, and the other communication has a higher priority than the communication.

[0193] In the ninth aspect, alone or in combination with one or more of the first to eighth aspects, the communication is associated with the random access configuration and is also at least partially based on satisfying a third one or more conditions, wherein the third one or more conditions include at least one of the following: a first condition, the first condition is associated with one or more network nodes, the one or more network nodes include the network node, the UE receives the indication that the UE will perform the MT-SDT operation, the RRC release communication that causes the UE to transition to RRC inactive mode, and the random access configuration from the network node, and the network node is included in the RNA associated with the UE; a second condition, the second condition is associated with whether the measured value of the downlink reference signal satisfies one or more SDT thresholds; or a third condition, the third condition is associated with whether the radio resources associated with the second uplink resources at least partially overlap with the radio resources of another communication, and the other communication has a higher priority than the communication.

[0194] In a tenth aspect, alone or in combination with one or more of the first to ninth aspects, the process 900 includes receiving configuration information associated with the MT-SDT operation.

[0195] In an eleventh aspect, alone or in combination with one or more of the first to tenth aspects, the configuration information indicates that a PRACH resource associated with the MO-SDT configuration or the random access configuration is to be shared with the MT-SDT operation.

[0196] In a twelfth aspect, alone or in combination with one or more of the first to eleventh aspects, the configuration information is associated with at least one of system information signaling, radio resource control signaling, MAC-CE signaling, or downlink control information signaling.

[0197] In the thirteenth aspect, either alone or in combination with one or more of the first to twelfth aspects, the configuration information includes information associated with one or more timers, the one or more timers being associated with at least one of the MT-SDT operation, the MO-SDT configuration or the random access configuration, and wherein the information associated with the one or more timers is associated with at least one of radio resource control signaling, MAC control element signaling or downlink control information signaling.

[0198] In a fourteenth aspect, either alone or in combination with one or more of the first to thirteenth aspects, the configuration information comprises power control information for downlink communications or uplink communications associated with the MT-SDT operation, the downlink communications or uplink communications comprising the communication.

[0199] In the fifteenth aspect, either alone or in combination with one or more of the first to fourteenth aspects, the power control information includes a power control command, and wherein receiving the configuration information includes: receiving an indication of the power control command via at least one of MAC control element signaling or downlink control information signaling.

[0200] In a sixteenth aspect, either alone or in combination with one or more of the first to fifteenth aspects, the configuration information comprises timing control information of a downlink communication or an uplink communication associated with the MT-SDT operation, the downlink communication or the uplink communication comprising the communication.

[0201] In the seventeenth aspect, alone or in combination with one or more of the first to sixteenth aspects, the timing control information includes at least one of the following: a timing advance command; configuration of a reference signal associated with a tracking loop and measurement; information on timing control associated with multiple serving network nodes of the UE; information associated with reporting timing advance information; or information associated with reporting auxiliary information, which auxiliary information is used for timing control or mobility management and measurement relaxation.

[0202] In the eighteenth aspect, alone or in combination with one or more of the first to seventeenth aspects, the timing control information includes the SFTD between the network node and other network nodes or multiple other network nodes, and wherein receiving the configuration information includes: receiving an indication of the SFTD via at least one of unicast signaling, multicast signaling or broadcast signaling.

[0203] In the nineteenth aspect, alone or in combination with one or more of the first to eighteenth aspects, the configuration information includes a path loss reference signal configuration, and wherein receiving the configuration information includes: receiving the path loss reference signal configuration or a modification of the path loss reference signal configuration via at least one of radio resource control signaling, MAC-CE signaling, or downlink control information signaling.

[0204] In a twentieth aspect, either alone or in combination with one or more of the first to nineteenth aspects, process 900 includes sending a UAI communication indicating mobility information associated with the UE, wherein the configuration information indicates a simplified RRM measurement configuration based at least in part on sending the UAI communication.

[0205] In aspect 21, either alone or in combination with one or more of aspects 1 to 20, the configuration information indicates a simplified downlink control channel monitoring or timeline configuration, and wherein receiving the configuration information comprises: receiving the simplified downlink control channel monitoring or timeline configuration via at least one of radio resource control signaling, MAC-CE signaling, or downlink control information signaling.

[0206] In aspect 22, either alone or in combination with one or more of aspects 1 to 21, the configuration information indicates an SPS or semi-static resource for a downlink channel associated with the MT-SDT operation, the SPS or semi-static resource being based at least in part on satisfying a second one or more conditions.

[0207] In the twenty-third aspect, alone or in combination with one or more of the first to twenty-second aspects, the second one or more conditions include at least one of the following: a first condition, the first condition is associated with whether the communication including the RRC recovery message is successfully sent; a second condition, the second condition is associated with whether the mobility information and link quality status associated with the UE are reported to the network node; a third condition, the third condition is associated with whether the indication for any subsequent downlink communication or uplink communication associated with the MT-SDT operation is received from the network node; a fourth condition, the fourth condition is associated with whether the measurement value of the downlink reference signal satisfies the conditions for link quality assessment. and a threshold for timing alignment timer verification, which is configured for SPS or semi-static communication; a fifth condition, which is associated with whether the UE is configured with uplink resources to provide HARQ feedback associated with the MT-SDT operation, and the HARQ feedback occurs before the SDT timing alignment timer expires; a sixth condition, which is associated with whether the SDT error detection timer has expired, and the SDT error detection timer is started after the initial transmission or reception of the MT-SDT operation; or a seventh condition, which is associated with whether the network node is a serving network node for the UE and whether it is included in the RNA associated with the UE.

[0208] In the twenty-fourth aspect, either alone or in combination with one or more of the first to twenty-third aspects, process 900 includes receiving downlink communications associated with the MT-SDT operation from the network node, and transitioning to at least one of an RRC idle mode, an RRC inactive mode, or an RRC connected mode based at least in part on the downlink communications.

[0209] In a twenty-fifth aspect, either alone or in combination with one or more of aspects 1 to 24, the MT-SDT operation is associated with a session, and process 900 includes: detecting a termination event, and terminating the session based at least in part on detecting the termination event. In a twenty-sixth aspect, either alone or in combination with one or more of aspects 1 to 25, detecting the termination event includes: detecting that an SDT inactivity timer has expired before detecting or decoding a downlink control communication associated with the MT-SDT operation. In a twenty-seventh aspect, either alone or in combination with one or more of aspects 1 to 26, detecting the termination event includes: detecting that a measurement value of a downlink signal does not satisfy an SDT measurement value threshold.

[0210] In the twenty-eighth aspect, either alone or in combination with one or more of the first to twenty-seventh aspects, detecting the termination event includes: detecting that the SDT timing alignment timer has expired before sending feedback information for downlink communications associated with the MT-SDT operation. In the twenty-ninth aspect, either alone or in combination with one or more of the first to twenty-eighth aspects, detecting the termination event includes: selecting another network node to be associated with the MT-SDT operation, and detecting a failure associated with the other network node obtaining context information associated with the UE. In the thirtieth aspect, either alone or in combination with one or more of the first to twenty-ninth aspects, detecting the termination event includes: detecting that the geographic location of the UE is outside the RNA associated with the MT-SDT operation.

[0211] In the thirty-first aspect, alone or in combination with one or more of the first to thirtieth aspects, detecting the termination event includes: receiving a system information communication or an emergency notification communication that at least partially overlaps with a downlink communication associated with the session in the time domain. In the thirty-second aspect, alone or in combination with one or more of the first to thirty-first aspects, detecting the termination event includes: detecting that an SDT fault detection timer has expired. In the thirty-third aspect, alone or in combination with one or more of the first to thirty-second aspects, detecting the termination event includes: detecting that the number of PRACH preamble code transmissions performed by the UE meets a threshold.

[0212] In aspect thirty-four, alone or in combination with one or more of aspects one to thirty-three, detecting the termination event comprises: detecting that the number of retransmissions performed by the UE satisfies a threshold. In aspect thirty-five, alone or in combination with one or more of aspects one to thirty-four, detecting the termination event comprises: detecting that a response to the communication has not been received by the UE. In aspect thirty-six, alone or in combination with one or more of aspects one to thirty-five, detecting the termination event comprises: detecting that a power headroom of the UE does not satisfy an SDT power headroom threshold.

[0213] although Fig. 9 An example block diagram of process 900 is shown, but in some aspects, process 900 may include Fig. 9 The blocks depicted may be additional blocks, fewer blocks, different blocks, or blocks arranged in a different manner than those depicted. Additionally or alternatively, two or more of the blocks of process 900 may be performed in parallel.

[0214] Fig.10is a diagram illustrating an example process 1000, performed, for example, by a network node, in accordance with the present disclosure. The example process 1000 is an example of operations in which a network node (eg, network node 110) performs resource configuration and selection for downlink SDT.

[0215] like Fig.10 As shown, in some aspects, process 1000 may include: sending an indication to a UE that the UE will perform MT-SDT operations (block 1010). For example, a network node (e.g., using Fig.12 The depicted communications manager 150 and / or transmitting component 1204) can transmit, for a UE, an indication that the UE is to perform MT-SDT operations, as described above.

[0216] like Fig.10 As further shown, in some aspects, process 1000 may include, in response to the indication, receiving communications associated with the UE using: first uplink resources associated with the MO-SDT configuration that are used based at least in part on satisfying one or more conditions, or second uplink resources associated with the random access configuration that are used based at least in part on not satisfying the one or more conditions or based at least in part on not configuring the MO-SDT configuration for the UE (block 1020). For example, the network node (e.g., using Fig.12 The depicted communication manager 150 and / or receiving component 1202) may, in response to the indication, receive communications associated with the UE using: a first uplink resource associated with the MO-SDT configuration that is used based at least in part on satisfying one or more conditions, or a second uplink resource associated with the random access configuration that is used based at least in part on not satisfying the one or more conditions or at least in part on not configuring the MO-SDT configuration for the UE, as described above.

[0217] Process 1000 may include additional aspects, such as any single aspect or any combination of aspects described below and / or in conjunction with one or more other processes described elsewhere herein.

[0218] In a first aspect, the UE operates in an RRC idle mode or an RRC inactive mode. In a second aspect, alone or in combination with the first aspect, the indication that the UE will perform the MT-SDT operation is included in a paging signal. In a third aspect, alone or in combination with one or more of the first and second aspects, the communication is included in an RRC recovery request communication. In a fourth aspect, alone or in combination with one or more of the first to third aspects, the MT-SDT operation is associated with an MT SDT operation, and wherein the MO-SDT configuration is associated with an MO SDT configuration. In a fifth aspect, alone or in combination with one or more of the first to fourth aspects, the MO-SDT configuration includes at least one of a CG MO-SDT configuration or a random access SDT configuration.

[0219] In the sixth aspect, alone or in combination with one or more of the first to fifth aspects, the MO-SDT configuration includes a CG MO-SDT configuration or a random access SDT configuration, and wherein the communication is associated with: the CG MO-SDT configuration associated with the communication at least partially based on satisfying a first one or more of the one or more conditions, the random access SDT configuration associated with the communication at least partially based on not satisfying the one or more conditions and at least partially based on satisfying a second one or more of the one or more conditions, or the random access configuration associated with the communication at least partially based on not satisfying the first one or more conditions and the second one or more conditions.

[0220] In the seventh aspect, alone or in combination with one or more of the first to sixth aspects, the first one or more conditions include at least one of the following: a first condition, which is associated with whether the network node is a serving network node that sends an RRC communication that causes the UE to transition to RRC inactive mode; a second condition, which is associated with whether the serving network node sends the CG MO-SDT configuration; a third condition, which is associated with whether the amount of pending uplink data across all SDT radio bearers satisfies an uplink data amount threshold; a fourth condition, which is associated with whether the measured value of the downlink reference signal satisfies the uplink CG threshold; a fifth condition, which is associated with whether the SDT timing alignment timer expires; or a sixth condition, which is associated with whether the time domain resources associated with the first uplink resources at least partially overlap with the time domain resources of another communication, which has a higher priority than the communication.

[0221] In the eighth aspect, alone or in combination with one or more of the first to seventh aspects, the second one or more conditions include at least one of the following: a first condition, the first condition is associated with one or more network nodes, the one or more network nodes include the network node, the network node sends the following: the indication that the UE will perform the MT-SDT operation, the RRC communication that causes the UE to transition to RRC inactive mode, and the random access SDT configuration, and the network node is included in the RNA associated with the UE; a second condition, the second condition is associated with whether the amount of pending uplink data across all SDT radio bearers satisfies the uplink data amount threshold; a third condition, the third condition is associated with whether the measured value of the downlink reference signal satisfies the random access SDT threshold; or a fourth condition, the fourth condition is associated with whether the time domain resources associated with the first uplink resource at least partially overlap with the time domain resources of another communication, and the other communication has a higher priority than the communication.

[0222] In the ninth aspect, alone or in combination with one or more of the first to eighth aspects, the communication is associated with the random access configuration and is also at least partially based on satisfying a third one or more conditions, wherein the third one or more conditions include at least one of the following: a first condition, which is associated with one or more network nodes, the one or more network nodes including the network node, which sends the following: the indication that the UE will perform the MT-SDT operation, the RRC communication that causes the UE to transition to RRC inactive mode, and the random access configuration, and the network node is included in the RNA associated with the UE; a second condition, which is associated with whether the measured value of the downlink reference signal satisfies the SDT threshold; or a third condition, which is associated with whether the time domain resources associated with the second uplink resources at least partially overlap with the time domain resources of another communication, and the other communication has a higher priority than the communication.

[0223] In a tenth aspect, alone or in combination with one or more of the first to ninth aspects, process 1000 includes: sending configuration information associated with the MT-SDT operation to the UE. In an eleventh aspect, alone or in combination with one or more of the first to tenth aspects, the configuration information indicates that the PRACH resources associated with the MO-SDT configuration will be associated with the MT-SDT operation. In a twelfth aspect, alone or in combination with one or more of the first to eleventh aspects, the configuration information is associated with at least one of system information signaling, radio resource control signaling, MAC-CE signaling, or downlink control information signaling.

[0224] In the thirteenth aspect, either alone or in combination with one or more of the first to twelfth aspects, the configuration information includes information associated with one or more timers, the one or more timers are associated with the MT-SDT operation, and wherein the information associated with the one or more timers is associated with at least one of radio resource control signaling, MAC-CE signaling, or downlink control information signaling.

[0225] In a fourteenth aspect, alone or in combination with one or more of the first to thirteenth aspects, the configuration information includes power control information for uplink communications associated with the MT-SDT operation, the uplink communications including the communications. In a fifteenth aspect, alone or in combination with one or more of the first to fourteenth aspects, the power control information includes a power control command, and wherein sending the configuration information includes: sending an indication of the power control command via at least one of MAC-CE signaling or downlink control information signaling.

[0226] In a sixteenth aspect, either alone or in combination with one or more of the first to fifteenth aspects, the configuration information comprises timing control information of an uplink communication associated with the MT-SDT operation, the uplink communication comprising the communication. In a seventeenth aspect, either alone or in combination with one or more of the first to sixteenth aspects, the timing control information comprises a timing advance command, and wherein sending the configuration information comprises: sending an indication of the timing advance command via at least one of MAC-CE signaling or downlink control information signaling. In an eighteenth aspect, either alone or in combination with one or more of the first to seventeenth aspects, the timing control information comprises a SFTD between the network node and another network node or multiple other network nodes, and wherein sending the configuration information comprises: sending an indication of the SFTD via at least one of unicast signaling, multicast signaling, or broadcast signaling.

[0227] In the nineteenth aspect, alone or in combination with one or more of the first to eighteenth aspects, the configuration information includes a path loss reference signal configuration, and wherein sending the configuration information includes: sending the path loss reference signal configuration or a modification of the path loss reference signal configuration via at least one of radio resource control signaling, MAC-CE signaling, or downlink control information signaling.

[0228] In a twentieth aspect, either alone or in combination with one or more of the first to nineteenth aspects, process 1000 includes receiving a UAI communication indicating mobility information associated with the UE, wherein the configuration information indicates a simplified RRM measurement configuration based at least in part on sending the UAI communication.

[0229] In aspect 21, either alone or in combination with one or more of aspects 1 to 20, the configuration information indicates a simplified downlink control channel monitoring or timeline configuration, and wherein sending the configuration information comprises sending the simplified downlink control channel monitoring or timeline configuration via at least one of radio resource control signaling, MAC-CE signaling or downlink control information signaling.

[0230] In aspect 22, either alone or in combination with one or more of aspects 1 to 21, the configuration information indicates an SPS or semi-static resource for a downlink channel associated with the MT-SDT operation, the SPS or semi-static resource being based at least in part on satisfying a second one or more conditions.

[0231] In the twenty-third aspect, alone or in combination with one or more of the first to twenty-second aspects, the second one or more conditions include at least one of the following: a first condition, the first condition is associated with whether the communication is successfully received by the network node; a second condition, the second condition is associated with whether the mobility information and link quality status associated with the UE are received by the network node; a third condition, the third condition is associated with whether the network node sends the indication and any subsequent downlink communication associated with the MT-SDT operation; a fourth condition, the fourth condition is associated with whether the measured value of the downlink reference signal meets the SPS threshold; a fifth condition, the fifth condition is associated with whether the UE is configured with uplink resources to provide HARQ feedback associated with the MT-SDT operation, and the HARQ feedback occurs before the expiration of the SDT timing alignment timer; or a sixth condition, the sixth condition is associated with whether the SDT timer has expired, and the SDT timer is started after the initial transmission of the MT-SDT operation.

[0232] In a twenty-fourth aspect, alone or in combination with one or more of the first to twenty-third aspects, process 1000 includes sending downlink communications associated with the MT-SDT operation.

[0233] In a twenty-fifth aspect, alone or in combination with one or more of the first to twenty-fourth aspects, the MT-SDT operation is associated with a session, and process 1000 includes: detecting a termination event, and terminating the session based at least in part on detecting the termination event.

[0234] although Fig.10 An example block diagram of process 1000 is shown, but in some aspects, process 1000 may include Fig.10The blocks depicted may be additional blocks, fewer blocks, different blocks, or blocks arranged in a different manner than those depicted. Additionally or alternatively, two or more of the blocks of process 1000 may be performed in parallel.

[0235] Fig.11 1 is a diagram of an example apparatus 1100 for wireless communication according to the present disclosure. The apparatus 1100 may be a UE, or the UE may include the apparatus 1100. In some aspects, the apparatus 1100 includes a receiving component 1102 and a sending component 1104 that may communicate with each other (e.g., via one or more buses and / or one or more other components). As shown, the apparatus 1100 may communicate with another apparatus 1106 (such as a UE, a base station, or another wireless communication device) using the receiving component 1102 and the sending component 1104. As further shown, the apparatus 1100 may include a communication manager 140. The communication manager 140 may include one or more of a resource selection component 1108 and / or a mode handling component 1110, etc.

[0236] In some aspects, the apparatus 1100 may be configured to perform Figure 8 Additionally or alternatively, the apparatus 1100 may be configured to perform one or more of the processes described herein (such as Fig. 9 In some aspects, Fig.11 The device 1100 and / or one or more components shown may include a combination of Figure 2 Additionally or alternatively, Fig.11 One or more of the components shown may be combined with Figure 2 Additionally or alternatively, one or more components in the set of components may be implemented at least in part as software stored in a memory. For example, a component (or a portion of a component) may be implemented as instructions or code stored in a non-transitory computer-readable medium and can be executed by a controller or processor to perform the function or operation of the component.

[0237] The receiving component 1102 may receive communications from the device 1106, such as reference signals, control information, data communications, or combinations thereof. The receiving component 1102 may provide the received communications to one or more other components of the device 1100. In some aspects, the receiving component 1102 may perform signal processing (such as filtering, amplification, demodulation, analog-to-digital conversion, demultiplexing, deinterleaving, demapping, equalization, interference cancellation, or decoding, etc.) on the received communications and may provide the processed signals to one or more other components of the device 1100. In some aspects, the receiving component 1102 may include combining Figure 2One or more antennas, modems, demodulators, MIMO detectors, receive processors, controllers / processors, memories, or combinations thereof of the described UE.

[0238] The transmitting component 1104 may transmit communications, such as reference signals, control information, data communications, or combinations thereof, to the device 1106. In some aspects, one or more other components of the device 1100 may generate communications and may provide the generated communications to the transmitting component 1104 for transmission to the device 1106. In some aspects, the transmitting component 1104 may perform signal processing (such as filtering, amplification, modulation, digital-to-analog conversion, multiplexing, interleaving, mapping, or encoding, etc.) on the generated communications and may transmit the processed signals to the device 1106. In some aspects, the transmitting component 1104 may include combining Figure 2 One or more antennas, modems, modulators, transmit MIMO processors, transmit processors, controllers / processors, memories, or combinations thereof of the described UE. In some aspects, the transmit component 1104 can be co-located with the receive component 1102 in a transceiver.

[0239] The receiving component 1102 can receive an indication from the network node that the UE will perform MT-SDT operations. The sending component 1104 can, in response to the indication, send a communication to the network node using: a first uplink resource associated with a MO-SDT configuration for use based at least in part on satisfying one or more conditions, or a second uplink resource associated with a random access configuration for use based at least in part on not satisfying the one or more conditions or at least in part on not configuring a MO-SDT configuration for the UE.

[0240] Resource selecting component 1108 can select the first uplink resource or the second uplink resource based at least in part on determining whether the one or more conditions are satisfied.

[0241] The receiving component 1102 may receive configuration information associated with the MT-SDT operation. The sending component 1104 may send a UAI communication indicating mobility information associated with the UE, wherein the configuration information indicates a simplified RRM measurement configuration based at least in part on sending the UAI communication. The receiving component 1102 may receive a downlink communication associated with the MT-SDT operation from the network node. The mode handling component 1110 may transition to at least one of an RRC idle mode, an RRC inactive mode, or an RRC connected mode based at least in part on the downlink communication.

[0242] Fig.11 The number and arrangement of components shown are provided as examples. In practice, there may be Fig.11Additional components, fewer components, different components, or components arranged in a different manner than those shown. Fig.11 Two or more components shown may be implemented in a single component, or Fig.11 The single component shown may be implemented as multiple distributed components. Additionally or alternatively, Fig.11 The component set (one or more components) shown may be described as being executable by Fig.11 Another component shown may be a collection of components that perform one or more functions.

[0243] Fig.12 1 is a diagram of an example apparatus 1200 for wireless communication according to the present disclosure. Apparatus 1200 may be a network node, or a network node may include apparatus 1200. In some aspects, apparatus 1200 includes a receiving component 1202 and a sending component 1204 that may communicate with each other (e.g., via one or more buses and / or one or more other components). As shown, apparatus 1200 may communicate with another apparatus 1206 (such as a UE, a base station, or another wireless communication device) using receiving component 1202 and sending component 1204. As further shown, apparatus 1200 may include a communication manager 150. Communication manager 150 may include a determining component 1208, among other things.

[0244] In some aspects, the apparatus 1200 may be configured to perform Figure 8 Additionally or alternatively, the apparatus 1200 may be configured to perform one or more of the processes described herein (such as Fig.10 In some aspects, Fig.12 The device 1200 and / or one or more components shown may include a combination of Figure 2 Additionally or alternatively, Fig.12 One or more of the components shown may be combined with Figure 2 Additionally or alternatively, one or more components in the set of components may be implemented at least in part as software stored in a memory. For example, a component (or a portion of a component) may be implemented as instructions or code stored in a non-transitory computer-readable medium and can be executed by a controller or processor to perform the function or operation of the component.

[0245] The receiving component 1202 may receive communications, such as reference signals, control information, data communications, or combinations thereof, from the device 1206. The receiving component 1202 may provide the received communications to one or more other components of the device 1200. In some aspects, the receiving component 1202 may perform signal processing (such as filtering, amplification, demodulation, analog-to-digital conversion, demultiplexing, deinterleaving, demapping, equalization, interference cancellation, or decoding, etc.) on the received communications and may provide the processed signals to one or more other components of the device 1200. In some aspects, the receiving component 1202 may include combining Figure 2 One or more antennas, modems, demodulators, MIMO detectors, receive processors, controllers / processors, memories, or combinations thereof, of the described network nodes.

[0246] The transmitting component 1204 may transmit communications, such as reference signals, control information, data communications, or combinations thereof, to the device 1206. In some aspects, one or more other components of the device 1200 may generate communications and may provide the generated communications to the transmitting component 1204 for transmission to the device 1206. In some aspects, the transmitting component 1204 may perform signal processing (such as filtering, amplification, modulation, digital-to-analog conversion, multiplexing, interleaving, mapping, or encoding, etc.) on the generated communications and may transmit the processed signals to the device 1206. In some aspects, the transmitting component 1204 may include combining Figure 2 One or more antennas, modems, modulators, transmit MIMO processors, transmit processors, controllers / processors, memories, or combinations thereof of the described network nodes. In some aspects, the transmit component 1204 can be co-located with the receive component 1202 in a transceiver.

[0247] The sending component 1204 can send an indication to the UE that the UE will perform MT-SDT operations. The receiving component 1202 can receive communications associated with the UE using, in response to the indication, a first uplink resource associated with the MO-SDT configuration for use based at least in part on satisfying one or more conditions, or a second uplink resource associated with the random access configuration for use based at least in part on not satisfying the one or more conditions or at least in part on not configuring the MO-SDT configuration for the UE.

[0248] The determining component 1208 can determine the one or more conditions.The determining component 1208 can determine the MO-SDT configuration and / or the random access configuration.

[0249] The sending component 1204 can send configuration information associated with the MT-SDT operation to the UE.

[0250] Receiving component 1202 can receive a UAI communication indicating mobility information associated with the UE, wherein the configuration information indicates a simplified RRM measurement configuration based at least in part on sending the UAI communication.

[0251] Transmitting component 1204 can transmit downlink communications associated with the MT-SDT operation.

[0252] Fig.12 The number and arrangement of components shown are provided as examples. In practice, there may be Fig.12 Additional components, fewer components, different components, or components arranged in a different manner than those shown. Fig.12 Two or more components shown may be implemented in a single component, or Fig.12 The single component shown may be implemented as multiple distributed components. Additionally or alternatively, Fig.12 The component set (one or more components) shown may be described as being executable by Fig.12 Another component shown may be a collection of components that perform one or more functions.

[0253] The following provides an overview of some aspects of the disclosure:

[0254] Aspect 1: A method of wireless communication performed by a user equipment (UE), the method comprising: receiving an indication from a network node that the UE will perform a mobile terminated (MT) small data transmission (SDT) (MT-SDT) operation; and in response to the indication, sending communications to the network node using: a first uplink resource associated with a mobile originated (MO) SDT (MO-SDT) configuration that is used at least in part based on satisfying one or more conditions, or a second uplink resource associated with a random access configuration that is used at least in part based on not satisfying the one or more conditions or at least in part based on not configuring the MO-SDT configuration for the UE.

[0255] Aspect 2: The method according to aspect 1, wherein the UE operates in a radio resource control (RRC) idle mode or an RRC inactive mode.

[0256] Aspect 3: The method according to any one of aspects 1 to 2, wherein the indication that the UE is to perform the MT-SDT operation is included in a paging signal.

[0257] Aspect 4: The method according to any one of aspects 1 to 3, wherein the communication is included in a radio resource control (RRC) resumption request communication.

[0258] Aspect 5: The method according to any one of aspects 1 to 4, wherein the MT-SDT operation is associated with a downlink SDT operation, and wherein the MO-SDT configuration is associated with an uplink SDT configuration.

[0259] Aspect 6: The method according to any one of aspects 1 to 5, wherein the MO-SDT configuration includes at least one of a configuration grant (CG) SDT (CG-SDT) configuration or a random access SDT (RA-SDT) configuration.

[0260] Aspect 7: A method according to any one of Aspects 1 to 6, wherein the MO-SDT configuration includes a configuration grant (CG) SDT (CG-SDT) configuration or a random access SDT (RA-SDT) configuration, and wherein the communication is associated with: the CG-SDT uplink SDT configuration associated with the communication based at least in part on satisfying a first one or more of the one or more conditions; the random access SDT configuration associated with the communication based at least in part on not satisfying the first one or more conditions and at least in part on satisfying a second one or more of the one or more conditions; or the random access configuration associated with the communication based at least in part on not satisfying the first one or more conditions and the second one or more conditions.

[0261] Aspect 8: A method according to Aspect 7, wherein the first one or more conditions include at least one of the following: a first condition, the first condition is associated with whether the network node is a serving network node, and the UE receives a radio resource control (RRC) release message from the serving network node that causes the UE to transition to RRC inactive mode; a second condition, the second condition is associated with whether the CG-SDT configuration is received from the serving network node; a third condition, the third condition is associated with whether the amount of pending uplink data across all SDT radio bearers satisfies one or more uplink data amount thresholds, and the one or more uplink data amount thresholds are associated with the MO-SDT configuration or the a fourth condition, the fourth condition being associated with whether the measured value of the downlink reference signal satisfies one or more thresholds for link quality assessment, the one or more thresholds being associated with the MO-SDT configuration or at least one of the MT-SDT operations; a fifth condition, the fifth condition being associated with whether at least one of an SDT timing alignment timer or a hybrid automatic repeat request (HARQ) round trip time (RTT) timer expires; or a sixth condition, the sixth condition being associated with whether the radio resources associated with the first uplink resources at least partially overlap with the radio resources of another communication, the other communication having a higher priority than the communication.

[0262] Aspect 9: A method according to any one of aspects 7 to 8, wherein the second one or more conditions include at least one of the following: a first condition, the first condition is associated with one or more network nodes, the one or more network nodes include the network node, the UE receives the indication that the UE will perform the MT-SDT operation, the radio resource control (RRC) release message that causes the UE to transition to RRC inactive mode, and the configuration for the MT-SDT operation or the RA-SDT configuration from the network node, and the network node is included in a radio access network (RAN) notification area (RNA) associated with the UE; a second condition, the second condition is associated with a radio access network (RAN) across all SDT radio A third condition is associated with whether the amount of pending uplink data carried by the electronic carrier satisfies one or more uplink data amount thresholds, and the one or more uplink data amount thresholds are associated with at least one of the MO-SDT configuration or the MT-SDT operation; a third condition is associated with whether the measured value of the downlink reference signal satisfies one or more thresholds for link quality assessment, and the one or more thresholds are associated with at least one of the MO-SDT configuration or the MT-SDT operation; or a fourth condition is associated with whether the radio resources associated with the first uplink resources at least partially overlap with the radio resources of another communication, and the other communication has a higher priority than the communication.

[0263] Aspect 10: A method according to any one of Aspects 7 to 9, wherein the communication is associated with the random access configuration and is also at least partially based on satisfying a third one or more conditions, wherein the third one or more conditions include at least one of the following: a first condition, the first condition is associated with one or more network nodes, the one or more network nodes include the network node, the UE receives from the network node the indication that the UE will perform the MT-SDT operation, a radio resource control (RRC) release message that causes the UE to transition to RRC inactive mode, a configuration for the MT-SDT operation or the RA-SDT configuration, and the network node is included in a radio access network (RAN) notification area (RNA) associated with the UE; a second condition, the second condition is associated with whether the measured value of the downlink reference signal satisfies one or more thresholds for link quality assessment, the one or more thresholds are associated with at least one of the MT-SDT operation or the random access configuration; or a third condition, the third condition is associated with whether the radio resources associated with the second uplink resource at least partially overlap with the radio resources of another communication, and the other communication has a higher priority than the communication.

[0264] Aspect 11: According to the method according to any one of aspects 1 to 10, the method further comprises: receiving configuration information associated with the MT-SDT operation.

[0265] Aspect 12: The method according to aspect 11, wherein the configuration information indicates that a physical random access channel (PRACH) resource associated with the MO-SDT configuration or the random access configuration is to be shared with the MT-SDT operation.

[0266] Aspect 13: The method according to any one of aspects 11 to 12, wherein the configuration information is associated with at least one of system information signaling, radio resource control signaling, medium access control (MAC) control element signaling, or downlink control information signaling.

[0267] Aspect 14: A method according to any one of Aspects 11 to 13, wherein the configuration information includes information associated with one or more timers, the one or more timers are associated with the MT-SDT operation, and wherein the information associated with one or more timers is associated with at least one of radio resource control signaling, medium access control (MAC) control element signaling, or downlink control information signaling.

[0268] Aspect 15: The method according to any one of aspects 11 to 14, wherein the configuration information includes power control information for uplink communications associated with the MT-SDT operation, the uplink communications including the communications.

[0269] Aspect 16: A method according to Aspect 15, wherein the power control information includes a power control command, and wherein receiving the configuration information includes: receiving an indication of the power control command via at least one of medium access control (MAC) control element signaling or downlink control information signaling.

[0270] Aspect 17: The method according to any one of aspects 11 to 16, wherein the configuration information includes timing control information of downlink communication or uplink communication associated with the MT-SDT operation, the downlink communication or the uplink communication including the communication.

[0271] Aspect 18: A method according to Aspect 17, wherein the timing control information includes at least one of the following: a timing advance command; configuration of a reference signal associated with a tracking loop and measurement; information on timing control associated with multiple serving network nodes of the UE; information associated with reporting timing advance information; or information associated with reporting auxiliary information, the auxiliary information being used for timing control or mobility management and measurement relaxation.

[0272] Aspect 19: A method according to any one of Aspects 17 to 18, wherein the timing control information includes a system frame timing difference (SFTD) between the network node and other network nodes or multiple other network nodes, and wherein receiving the configuration information includes: receiving an indication of the SFTD via at least one of unicast signaling, multicast signaling or broadcast signaling.

[0273] Aspect 20: A method according to any one of Aspects 11 to 19, wherein the configuration information includes a path loss reference signal configuration, and wherein receiving the configuration information includes: receiving the path loss reference signal configuration or a modification to the path loss reference signal configuration via at least one of radio resource control signaling, medium access control (MAC) control element signaling, or downlink control information signaling.

[0274] Aspect 21: According to any one of Aspects 11 to 20, the method further includes: sending UE assistance information (UAI) communication indicating mobility information associated with the UE, wherein the configuration information indicates a simplified radio resource management (RRM) measurement configuration at least in part based on sending the UAI communication.

[0275] Aspect 22: A method according to any one of Aspects 11 to 21, wherein the configuration information indicates simplified downlink control channel monitoring or timeline configuration, and wherein receiving the configuration information includes: receiving the simplified downlink control channel monitoring or timeline configuration via at least one of radio resource control signaling, medium access control (MAC) control element signaling, or downlink control information signaling.

[0276] Aspect 23: A method according to any one of Aspects 11 to 22, wherein the configuration information indicates semi-persistent scheduling (SPS) or semi-static resources for a downlink channel associated with the MT-SDT operation, and the semi-persistent scheduling (SPS) or semi-static resources are at least partially based on satisfying a second one or more conditions.

[0277] Aspect 24: A method according to aspect 23, wherein the second one or more conditions include at least one of the following: a first condition, the first condition is associated with whether the communication including a radio resource control (RRC) recovery message is successfully sent; a second condition, the second condition is associated with whether the mobility information and link quality status associated with the UE are reported to the network node; a third condition, the third condition is associated with whether the indication for any subsequent downlink or uplink communication associated with the MT-SDT operation is received from the network node; a fourth condition, the fourth condition is associated with whether the measurement value of the downlink reference signal satisfies a threshold for link quality assessment and timing alignment timer verification, the threshold being S PS or semi-static communication configuration; a fifth condition, the fifth condition is associated with whether the UE is configured with valid uplink resources to provide a hybrid automatic repeat request (HARQ) feedback associated with the MT-SDT operation, and the hybrid automatic repeat request (HARQ) feedback occurs before the SDT timing alignment timer expires; a sixth condition, the sixth condition is associated with whether the SDT error detection timer has expired, and the SDT error detection timer is started after the initial transmission or reception of the MT-SDT operation; or a seventh condition, the seventh condition is associated with whether the network node is a serving network node of the UE and whether it is included in a radio access network (RAN) notification area (RNA) associated with the UE.

[0278] Aspect 25: According to the method described in any one of Aspects 1 to 24, the method also includes: receiving downlink communications associated with the MT-SDT operation from the network node; and transitioning to at least one of a radio resource control (RRC) idle mode, an RRC inactive mode, or an RRC connected mode based at least in part on the downlink communications.

[0279] Aspect 26: The method according to any one of aspects 1 to 25, wherein the MT-SDT operation is associated with a session, the method further comprising: detecting a termination event; and terminating the session based at least in part on detecting the termination event.

[0280] Aspect 27: The method according to aspect 26, wherein detecting the termination event comprises: detecting that an SDT inactivity timer has expired before detecting or decoding a downlink control communication associated with the MT-SDT operation.

[0281] Aspect 28: The method according to any one of aspects 26 to 27, wherein detecting the termination event includes: detecting that the measurement value of the downlink signal does not meet one or more SDT measurement value thresholds.

[0282] Aspect 29: The method according to any one of aspects 26 to 28, wherein detecting the termination event comprises: detecting that an SDT timing alignment timer has expired before sending feedback information for downlink communications associated with the MT-SDT operation.

[0283] Aspect 30: A method according to any one of Aspects 26 to 29, wherein detecting the termination event comprises: selecting another network node to be associated with the MT-SDT operation; and detecting a failure associated with the other network node obtaining context information associated with the UE.

[0284] Aspect 31: The method according to any one of aspects 26 to 30, wherein detecting the termination event comprises detecting that the geographical location of the UE is outside a radio access network (RAN) notification area (RNA) associated with the MT-SDT operation.

[0285] Aspect 32: The method according to any one of aspects 26 to 31, wherein detecting the termination event comprises: receiving a system information communication or an emergency notification communication that at least partially overlaps with a downlink communication associated with the session in the time domain.

[0286] Aspect 33: The method according to any one of aspects 26 to 32, wherein detecting the termination event comprises: detecting that an SDT fault detection timer has expired.

[0287] Aspect 34: A method according to any one of Aspects 26 to 33, wherein detecting the termination event includes: detecting that a number of physical random access channel (PRACH) preamble code transmissions performed by the UE meets a threshold.

[0288] Aspect 35: A method according to any one of aspects 26 to 34, wherein detecting the termination event comprises: detecting that a number of retransmissions performed by the UE satisfies a threshold.

[0289] Aspect 36: The method according to any one of aspects 26 to 35, wherein detecting the termination event includes: detecting that a response to the communication has not been received by the UE.

[0290] Aspect 37: The method according to any one of aspects 26 to 36, wherein detecting the termination event includes: detecting that the power headroom of the UE does not meet an SDT power headroom threshold.

[0291] Aspect 38: A method of wireless communication performed by a network node: the method comprising: sending an indication to a user equipment (UE) that the UE will perform a mobile terminated (MT) small data transmission (SDT) (MT-SDT) operation; and in response to the indication, receiving communications associated with the UE using: a first uplink resource associated with a mobile originated (MO) SDT (MO-SDT) configuration that is used at least in part based on satisfying one or more conditions, or a second uplink resource associated with a random access configuration that is used at least in part based on not satisfying the one or more conditions or at least in part based on not configuring the MO-SDT configuration for the UE.

[0292] Aspect 39: The method according to aspect 38, wherein the UE operates in a radio resource control (RRC) idle mode or an RRC inactive mode.

[0293] Aspect 40: The method according to any one of aspects 38 to 39, wherein the indication that the UE is to perform the MT-SDT operation is included in a paging signal.

[0294] Aspect 41: A method according to any one of aspects 38 to 40, wherein the communication is included in a radio resource control (RRC) resumption request communication.

[0295] Aspect 42: The method according to any one of aspects 38 to 41, wherein the MT-SDT operation is associated with a downlink SDT operation, and wherein the MO-SDT configuration is associated with an uplink SDT configuration.

[0296] Aspect 43: The method according to any one of aspects 38 to 42, wherein the MO-SDT configuration includes at least one of a configuration grant (CG) SDT (CG-SDT) configuration or a random access SDT (RA-SDT) configuration.

[0297] Aspect 44: A method according to any one of Aspects 38 to 43, wherein the MO-SDT configuration includes a configuration grant (CG) SDT (CG-SDT) configuration or a random access SDT (RA-SDT) configuration, and wherein the communication is associated with: the CG-SDT configuration associated with the communication based at least in part on satisfying a first one or more of the one or more conditions; the RA-SDT configuration associated with the communication based at least in part on not satisfying the first one or more conditions and at least in part on satisfying a second one or more of the one or more conditions; or the random access configuration associated with the communication based at least in part on not satisfying the first one or more conditions and the second one or more conditions.

[0298] Aspect 45: A method according to aspect 44, wherein the first one or more conditions include at least one of the following: a first condition, the first condition is associated with whether the network node is a serving network node, and the UE receives a radio resource control (RRC) release message from the serving network node that causes the UE to transition to RRC inactive mode; a second condition, the second condition is associated with whether the CG-SDT configuration is received from the serving network node; a third condition, the third condition is associated with whether the amount of pending uplink data across all SDT radio bearers satisfies one or more uplink data amount thresholds, and the one or more uplink data amount thresholds are associated with the MO-SDT configuration or A fourth condition is associated with whether the measured value of the downlink reference signal satisfies one or more thresholds for link quality assessment, and the one or more thresholds are associated with the MO-SDT configuration or at least one of the MT-SDT operations; a fifth condition is associated with whether at least one of the SDT timing alignment timer or the hybrid automatic repeat request (HARQ) round trip time (RTT) timer expires; or a sixth condition is associated with whether the radio resources associated with the first uplink resources at least partially overlap with the radio resources of another communication, and the other communication has a higher priority than the communication.

[0299] Aspect 46: A method according to any one of aspects 44 to 45, wherein the second one or more conditions include at least one of the following: a first condition, the first condition is associated with one or more network nodes, the one or more network nodes include the network node, the UE receives the indication that the UE will perform the MT-SDT operation, the radio resource control (RRC) release message that causes the UE to transition to RRC inactive mode, and the configuration for the MT-SDT operation or the RA-SDT configuration from the network node, and the network node is included in a radio access network (RAN) notification area (RNA) associated with the UE; a second condition, the second condition is associated with a non-RTD across all SDT The first condition is associated with whether the amount of pending uplink data carried by the first uplink line satisfies one or more uplink data amount thresholds, and the one or more uplink data amount thresholds are associated with at least one of the MO-SDT configuration or the MT-SDT operation; a third condition is associated with whether the measured value of the downlink reference signal satisfies one or more thresholds for link quality assessment, and the one or more thresholds are associated with at least one of the MO-SDT configuration or the MT-SDT operation; or a fourth condition is associated with whether the radio resources associated with the first uplink resources at least partially overlap with the radio resources of another communication, and the other communication has a higher priority than the communication.

[0300] Aspect 47: A method according to any one of Aspects 44 to 46, wherein the communication is associated with the random access configuration and is also at least partially based on satisfying a third one or more conditions, wherein the third one or more conditions include at least one of the following: a first condition, the first condition is associated with one or more network nodes, the one or more network nodes include the network node, the UE receives from the network node the indication that the UE will perform the MT-SDT operation, a radio resource control (RRC) release message that causes the UE to transition to RRC inactive mode, a configuration for the MT-SDT operation or the RA-SDT configuration, and the network node is included in a radio access network (RAN) notification area (RNA) associated with the UE; a second condition, the second condition is associated with whether the measured value of the downlink reference signal satisfies one or more thresholds for link quality assessment, the one or more thresholds are associated with at least one of the MT-SDT operation or the random access configuration; or a third condition, the third condition is associated with whether the radio resources associated with the second uplink resources at least partially overlap with the radio resources of another communication, and the other communication has a higher priority than the communication.

[0301] Aspect 48: According to the method according to any one of aspects 38 to 47, the method further includes: sending configuration information associated with the MT-SDT operation to the UE.

[0302] Aspect 49: The method according to aspect 48, wherein the configuration information indicates that a physical random access channel (PRACH) resource associated with the MO-SDT configuration or the random access configuration is to be shared with the MT-SDT operation.

[0303] Aspect 50: A method according to any one of aspects 48 to 49, wherein the configuration information is associated with at least one of system information signaling, radio resource control signaling, medium access control (MAC) control element signaling, or downlink control information signaling.

[0304] Aspect 51: A method according to any one of Aspects 48 to 50, wherein the configuration information includes information associated with one or more timers, the one or more timers are associated with the MT-SDT operation, the MO-SDT configuration or the random access configuration, and wherein the information associated with one or more timers is associated with at least one of radio resource control signaling, medium access control (MAC) control element signaling or downlink control information signaling.

[0305] Aspect 52: A method according to any one of aspects 48 to 51, wherein the configuration information includes power control information for downlink communication or uplink communication associated with the MT-SDT operation, the downlink communication or the uplink communication including the communication.

[0306] Aspect 53: A method according to Aspect 52, wherein the power control information includes a power control command, and wherein sending the configuration information includes: sending an indication of the power control command via at least one of medium access control (MAC) control element signaling or downlink control information signaling.

[0307] Aspect 54: A method according to any one of aspects 48 to 53, wherein the configuration information includes timing control information of downlink communication or uplink communication associated with the MT-SDT operation, the downlink communication or the uplink communication including the communication.

[0308] Aspect 55: A method according to Aspect 54, wherein the timing control information includes a timing advance command, and wherein sending the configuration information includes: sending an indication of the timing advance command via at least one of medium access control (MAC) control element signaling or downlink control information signaling.

[0309] Aspect 56: A method according to any one of Aspects 54 to 55, wherein the timing control information includes a system frame timing difference (SFTD) between the network node and other network nodes or multiple other network nodes, and wherein sending the configuration information includes: sending an indication of the SFTD via at least one of unicast signaling, multicast signaling or broadcast signaling.

[0310] Aspect 57: A method according to any one of Aspects 48 to 56, wherein the configuration information includes a path loss reference signal configuration, and wherein sending the configuration information includes: sending the path loss reference signal configuration or a modification to the path loss reference signal configuration via at least one of radio resource control signaling, medium access control (MAC) control element signaling, or downlink control information signaling.

[0311] Aspect 58: According to any one of Aspects 48 to 57, the method also includes: receiving UE assistance information (UAI) communication indicating mobility information associated with the UE, wherein the configuration information indicates a simplified radio resource management (RRM) measurement configuration based at least in part on sending the UAI communication.

[0312] Aspect 59: A method according to any one of Aspects 48 to 58, wherein the configuration information indicates a simplified downlink control channel monitoring or timeline configuration, and wherein sending the configuration information includes: sending the simplified downlink control channel monitoring or timeline configuration via at least one of radio resource control signaling, medium access control (MAC) control element signaling, or downlink control information signaling.

[0313] Aspect 60: A method according to any one of Aspects 48 to 59, wherein the configuration information indicates semi-persistent scheduling (SPS) or semi-static resources for a downlink channel associated with the MT-SDT operation, and the semi-persistent scheduling (SPS) or semi-static resources are at least partially based on satisfying a second one or more conditions.

[0314] Aspect 61: A method according to aspect 60, wherein the second one or more conditions include at least one of the following: a first condition, the first condition is associated with whether the communication is successfully received by the network node; a second condition, the second condition is associated with whether the mobility information and link quality status associated with the UE are received by the network node; a third condition, the third condition is associated with whether the network node sends the indication and any subsequent downlink communication associated with the MT-SDT operation; a fourth condition, the fourth condition is associated with whether the measured value of the downlink reference signal meets the SPS threshold; a fifth condition, the fifth condition is associated with whether the UE is configured with uplink resources to provide hybrid automatic repeat request (HARQ) feedback associated with the MT-SDT operation, and the hybrid automatic repeat request (HARQ) feedback occurs before the expiration of the SDT timing alignment timer; or a sixth condition, the sixth condition is associated with whether the SDT timer has expired, and the SDT timer is started after the initial transmission of the MT-SDT operation.

[0315] Aspect 62: The method according to any one of aspects 38 to 61, the method further comprising: sending downlink communications associated with the MT-SDT operation.

[0316] Aspect 63: A method according to any one of aspects 38 to 62, wherein the MT-SDT operation is associated with a session, the method further comprising: detecting a termination event; and terminating the session based at least in part on detecting the termination event.

[0317] Aspect 64: An apparatus for performing wireless communications at a device, the apparatus comprising: a processor; a memory coupled to the processor; and instructions stored in the memory and executable by the processor to cause the apparatus to perform one or more of the methods described in Aspects 1 to 37.

[0318] Aspect 65: A device for wireless communication, the device comprising a memory and one or more processors coupled to the memory, the one or more processors configured to perform the method according to one or more of aspects 1 to 37.

[0319] Aspect 66: An apparatus for wireless communication, the apparatus comprising at least one component for performing the method according to one or more of aspects 1 to 37.

[0320] Aspect 67: A non-transitory computer-readable medium storing code for wireless communication, the code comprising instructions executable by a processor to perform the method according to one or more of aspects 1 to 37.

[0321] Aspect 68: A non-transitory computer-readable medium storing an instruction set for wireless communication, the instruction set comprising one or more instructions that, when executed by one or more processors of a device, cause the device to perform one or more of the methods described in aspects 1 to 37.

[0322] Aspect 69: An apparatus for wireless communication at a device, the apparatus comprising: a processor; a memory coupled to the processor; and instructions stored in the memory and executable by the processor to cause the apparatus to perform one or more of the methods described in Aspects 38 to 63.

[0323] Aspect 70: An apparatus for wireless communication, the apparatus comprising a memory and one or more processors coupled to the memory, the one or more processors configured to perform the method according to one or more of aspects 38 to 63.

[0324] Aspect 71: An apparatus for wireless communication, the apparatus comprising at least one component for performing the method according to one or more of aspects 38 to 63.

[0325] Aspect 72: A non-transitory computer-readable medium storing code for wireless communication, the code comprising instructions executable by a processor to perform the method according to one or more of aspects 38 to 63.

[0326] Aspect 73: A non-transitory computer-readable medium storing an instruction set for wireless communication, the instruction set comprising one or more instructions that, when executed by one or more processors of a device, cause the device to perform one or more of the methods described in aspects 38 to 63.

[0327] 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 various aspects.

[0328] As used herein, the term "component" is intended to be broadly interpreted as hardware, and / or a combination of hardware and software. Whether referred to as software, firmware, middleware, microcode, hardware description language or other names, "software" should be broadly interpreted as meaning instructions, instruction sets, codes, code segments, program codes, programs, subroutines, software modules, applications, software applications, software packages, routines, subroutines, objects, executable files, execution threads, procedures and / or functions, etc. As used herein, "processor" is implemented by a combination of hardware and / or hardware and software. It will be apparent that the system and / or method described herein can be implemented by a combination of hardware and / or hardware and software in different forms. The actual dedicated control hardware or software code used to implement these systems and / or methods does not limit various aspects. Therefore, the operation and behavior of the system and / or method are not described herein with reference to specific software codes, because it will be understood by those skilled in the art that software and hardware can be designed to implement the system and / or method based at least in part on the description herein.

[0329] As used herein, "satisfying a threshold" may refer to a value being greater than a threshold, greater than or equal to a threshold, less than a threshold, less than or equal to a threshold, equal to a threshold, not equal to a threshold, etc., depending on the context.

[0330] Although the specific combination of features is stated 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 can be combined in a manner not specifically stated in the claims and / or not disclosed in the specification. The disclosure of various aspects includes each dependent claim combined with each other claim in the claim set. As used herein, the phrase "at least one of" the list of items refers to any combination of these items (it includes a single member). As an example, "at least one of a, b or c" is intended to cover a, b, c, a+b, a+c, b+c and a+b+c, and any combination with multiple identical elements (for example, 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 sorting of a, b and c).

[0331] Any element, action or instruction used herein should not be interpreted as key or necessary, unless clearly stated. In addition, as used herein, the article "one" is intended to include one or more items, and can be used interchangeably with "one or more". In addition, as used herein, the article "said" is intended to include one or more items connected to the article "said", and can be used interchangeably with "one or more". In addition, as used herein, the terms "set" and "group" are intended to include one or more items, and can be used interchangeably with "one or more". If you only want to refer to a project, the phrase "only one" or similar terms will be used. In addition, as used herein, the terms "have", "have", "have" etc. are intended to be open terms, which do not limit the elements they modify (for example, "the element of having" A can also have B). In addition, the phrase "based on" is intended to mean "based at least in part", unless explicitly stated otherwise. In addition, as used herein, the term "or" is intended to be open when used in a series, and can be used interchangeably with "and / or", unless otherwise explicitly stated (for example, if used in combination with "any" or "only one").

Claims

1. A method of wireless communication performed by a user equipment (UE), the method comprising: receiving an indication from a network node that the UE is to perform a mobile terminated (MT) small data transmission (SDT) (MT-SDT) operation; as well as In response to the indication, sending a communication to the network node using: a first uplink resource associated with a mobile originated (MO) SDT (MO-SDT) configuration for use based at least in part on satisfying one or more conditions, or A second uplink resource associated with the random access configuration is used based at least in part on not satisfying the one or more conditions or based at least in part on not configuring a MO-SDT configuration for the UE.

2. The method of claim 1, wherein the MO-SDT configuration comprises a configuration grant (CG) SDT (CG-SDT) configuration or a random access SDT configuration (RA-SDT), and wherein the communication is associated with: the CG-SDT configuration associated with the communication based at least in part on satisfying a first one or more conditions of the one or more conditions; the RA-SDT configuration associated with the communication based at least in part on not satisfying the first one or more conditions and at least in part on satisfying a second one or more of the one or more conditions; or The random access configuration associated with the communication based at least in part on failure to satisfy the first one or more conditions and the second one or more conditions.

3. The method of claim 2, wherein the first one or more conditions include at least one of the following: a first condition, the first condition being associated with whether the network node is a serving network node, the UE receiving a radio resource control (RRC) release message from the serving network node causing the UE to transition to an RRC inactive mode, a second condition, the second condition being associated with whether the CG-SDT configuration is received from the serving network node, a third condition associated with whether a data amount of pending uplink data across all SDT radio bearers satisfies one or more uplink data amount thresholds, the one or more uplink data amount thresholds being associated with at least one of the MO-SDT configuration or the MT-SDT operation, a fourth condition, the fourth condition being associated with whether a measurement value of a downlink reference signal satisfies one or more thresholds for link quality assessment, the one or more thresholds being associated with at least one of the MO-SDT configuration or the MT-SDT operation, a fifth condition, the fifth condition being associated with whether at least one of an SDT timing alignment timer or a hybrid automatic repeat request (HARQ) round trip time (RTT) timer expires, or A sixth condition associated with whether a radio resource associated with the first uplink resource at least partially overlaps with a radio resource of another communication, the other communication having a higher priority than the communication.

4. The method according to any one of claims 2 to 3, wherein the second one or more conditions include at least one of the following: a first condition, the first condition being associated with one or more network nodes, the one or more network nodes including the network node from which the UE receives the indication that the UE will perform the MT-SDT operation, a radio resource control (RRC) release message that causes the UE to transition to an RRC inactive mode, and a configuration for the MT-SDT operation or the RA-SDT configuration, the network node being included in a radio access network (RAN) notification area (RNA) associated with the UE, a second condition associated with whether a data volume of pending uplink data across all SDT radio bearers satisfies one or more uplink data volume thresholds, the one or more uplink data volume thresholds being associated with at least one of the MO-SDT configuration or the MT-SDT operation, a third condition, the third condition being associated with whether a measurement value of a downlink reference signal satisfies one or more thresholds for link quality assessment, the one or more thresholds being associated with at least one of the MO-SDT configuration or the MT-SDT operation, or A fourth condition associated with whether a radio resource associated with the first uplink resource at least partially overlaps with a radio resource of another communication, the other communication having a higher priority than the communication.

5. The method of any one of claims 2 to 4, wherein the communication is associated with the random access configuration based at least in part on satisfying a third one or more conditions, wherein the third one or more conditions include at least one of the following: a first condition, the first condition being associated with one or more network nodes, the one or more network nodes including the network node from which the UE receives the indication that the UE will perform the MT-SDT operation, a radio resource control (RRC) release message that causes the UE to transition to an RRC inactive mode, a configuration for the MT-SDT operation or the RA-SDT configuration, the network node being included in a radio access network (RAN) notification area (RNA) associated with the UE, a second condition, wherein the second condition is associated with whether a measurement value of a downlink reference signal satisfies one or more thresholds for link quality assessment, wherein the one or more thresholds are associated with at least one of the MT-SDT operation or the random access configuration, or A third condition associated with whether a radio resource associated with the second uplink resource at least partially overlaps with a radio resource of another communication, the other communication having a higher priority than the communication.

6. The method according to any one of claims 1 to 5, further comprising: Configuration information associated with the MT-SDT operation is received via at least one of system information signaling, radio resource control signaling, medium access control (MAC) control element signaling, or downlink control information signaling.

7. The method of claim 6, wherein the configuration information indicates that a physical random access channel (PRACH) resource associated with the MO-SDT configuration or the random access configuration is to be shared with the MT-SDT operation.

8. The method according to any one of claims 6 to 7, wherein the configuration information comprises information associated with one or more timers, the one or more timers being associated with at least one of the MT-SDT operation, the MO-SDT configuration or the random access configuration, and The information associated with one or more timers is associated with at least one of the radio resource control signaling, the MAC control element signaling, or the downlink control information signaling.

9. The method according to any one of claims 6 to 8, wherein the configuration information comprises power control information of downlink communication or uplink communication associated with the MT-SDT operation, the downlink communication or the uplink communication comprising the communication.

10. The method according to any one of claims 6 to 9, wherein the configuration information comprises timing control information of downlink communication or uplink communication associated with the MT-SDT operation, the downlink communication or the uplink communication comprising the communication.

11. The method of claim 10, wherein the timing control information comprises at least one of: Timed advance order, Configuration of reference signals associated with tracking loops and measurements; Timing control information associated with multiple serving network nodes of the UE; Information associated with reporting timing advance information; or Information associated with reporting assistance information used for timing control or mobility management and measuring slack.

12. The method according to any one of claims 10 to 11, wherein the timing control information comprises a system frame timing difference (SFTD) between the network node and another network node or multiple other network nodes, and wherein receiving the configuration information comprises: An indication of the SFTD is received via at least one of unicast signaling, multicast signaling, or broadcast signaling.

13. The method according to any one of claims 1 to 12, wherein the MT-SDT operation is associated with a session, the method further comprising: Detect termination events; as well as The session is terminated based at least in part on detecting the termination event.

14. The method of claim 13, wherein detecting the termination event comprises detecting at least one of: Prior to detecting or decoding a downlink control communication associated with said MT-SDT operation, an SDT inactivity timer has expired, The measured value of the downlink signal does not meet the SDT measurement value threshold, Prior to sending feedback information for downlink communications associated with the MT-SDT operation, an SDT timing alignment timer has expired, The geographical location of the UE is outside a Radio Access Network (RAN) Notification Area (RNA) associated with the MT-SDT operation, a system information communication or an emergency notification communication at least partially overlapping in the time domain with a downlink communication associated with the session, The SDT fault detection timer has expired. a number of physical random access channel (PRACH) preamble transmissions performed by the UE satisfies a threshold, a number of retransmissions performed by the UE satisfies a threshold, a response to the communication has not been received by the UE, or The power headroom of the UE does not meet the SDT power headroom threshold.

15. A method of wireless communication performed by a network node, the method comprising: sending, to a user equipment (UE), an indication that the UE will perform a mobile terminated (MT) small data transmission (SDT) (MT-SDT) operation; as well as In response to the indication, receiving a communication associated with the UE using: a first uplink resource associated with a mobile originated (MO) SDT (MO-SDT) configuration for use based at least in part on satisfying one or more conditions, or A second uplink resource associated with the random access configuration is used based at least in part on not satisfying the one or more conditions or based at least in part on not configuring a MO-SDT configuration for the UE.

16. The method of claim 15, wherein the MO-SDT configuration comprises a Configuration Grant (CG) SDT (CG-SDT) configuration or a Random Access SDT (RA-SDT) configuration, and wherein the communication is associated with: the CG-SDT configuration associated with the communication based at least in part on satisfying a first one or more conditions of the one or more conditions; the RA-SDT configuration associated with the communication based at least in part on not satisfying the first one or more conditions and at least in part on satisfying a second one or more of the one or more conditions; or The random access configuration associated with the communication based at least in part on failure to satisfy the first one or more conditions and the second one or more conditions.

17. A user equipment (UE) for wireless communication, the user equipment (UE) comprising: Memory; and one or more processors coupled to the memory and configured to: Receiving from the network node that the UE will perform a Mobile Terminated (MT) Small Data Transmission (SDT) (MT-SDT) Instructions for operation; and In response to the indication, sending a communication to the network node using: a first uplink resource associated with a mobile originated (MO) SDT (MO-SDT) configuration for use based at least in part on satisfying one or more conditions, or A second uplink resource associated with the random access configuration is used based at least in part on not satisfying the one or more conditions or based at least in part on not configuring a MO-SDT configuration for the UE.

18. The UE of claim 17, wherein the MO-SDT configuration comprises a CG-SDT configuration or a RA-SDT configuration, and wherein the communication is associated with: the CG-SDT configuration associated with the communication based at least in part on satisfying a first one or more conditions of the one or more conditions; the RA-SDT configuration associated with the communication based at least in part on not satisfying the first one or more conditions and at least in part on satisfying a second one or more of the one or more conditions; or The random access configuration associated with the communication based at least in part on failure to satisfy the first one or more conditions and the second one or more conditions.

19. The UE of claim 18, wherein the first one or more conditions include at least one of the following: a first condition associated with whether the network node is a serving network node from which the UE receives a radio resource control (RRC) communication causing the UE to transition to an RRC inactive mode, a second condition, the second condition being associated with whether the CG-SDT configuration is received from the serving network node, a third condition, the third condition being associated with whether a data amount of pending uplink data across all SDT radio bearers satisfies an uplink data amount threshold, a fourth condition, the fourth condition being associated with whether the measured value of the downlink reference signal satisfies the uplink CG threshold, A fifth condition, the fifth condition being associated with whether the SDT timing alignment timer expires, or A sixth condition, the sixth condition being associated with whether a time domain resource associated with the first uplink resource at least partially overlaps with a time domain resource of another communication, the other communication having a higher priority than the first communication.

20. The UE according to any one of claims 18 to 19, wherein the second one or more conditions include at least one of the following: a first condition, the first condition being associated with one or more network nodes, the one or more network nodes including the network node from which the UE receives the indication that the UE is to perform the MT-SDT operation, a radio resource control (RRC) communication that causes the UE to transition to an RRC inactive mode, and the random access SDT configuration, the network node being included in a radio access network (RAN) notification area (RNA) associated with the UE, a second condition associated with whether a data amount of pending uplink data across all SDT radio bearers satisfies one or more uplink data amount thresholds, A third condition, the third condition being associated with whether the measured value of the downlink reference signal satisfies one or more random access SDT thresholds, or A fourth condition associated with whether a radio resource associated with the first uplink resource at least partially overlaps with a radio resource of another communication, the other communication having a higher priority than the communication.

21. The UE of any one of claims 18 to 20, wherein the communication is associated with the random access configuration further based at least in part on satisfying a third one or more conditions, wherein the third one or more conditions include at least one of the following: a first condition, the first condition being associated with one or more network nodes, the one or more network nodes including the network node from which the UE receives the indication that the UE is to perform the MT-SDT operation, a radio resource control (RRC) communication that causes the UE to transition to an RRC inactive mode, and the random access configuration, the network node being included in a radio access network (RAN) notification area (RNA) associated with the UE, a second condition, wherein the second condition is associated with whether the measured value of the downlink reference signal satisfies one or more SDT thresholds, or A third condition associated with whether a radio resource associated with the second uplink resource at least partially overlaps with a radio resource of another communication, the other communication having a higher priority than the communication.

22. The UE according to any one of claims 17 to 21, wherein the one or more processors are further configured to: Configuration information associated with the MT-SDT operation is received.

23. The UE of claim 22, wherein the configuration information comprises a path loss reference signal configuration, and wherein to receive the configuration information, the one or more processors are configured to: The path loss reference signal configuration or a modification to the path loss reference signal configuration is received via at least one of radio resource control signaling, medium access control (MAC) control element signaling, or downlink control information signaling.

24. The UE according to any one of claims 22 to 23, wherein the one or more processors are further configured to: sending a UE assistance information (UAI) communication indicating mobility information associated with the UE, Wherein the configuration information indicates a simplified radio resource management (RRM) measurement configuration based at least in part on sending the UAI communication.

25. The UE according to any one of claims 22 to 24, wherein the configuration information indicates simplified downlink control channel monitoring or timeline configuration, and wherein in order to receive the configuration information, the one or more processors are configured to: The simplified downlink control channel monitoring or timeline configuration is received via at least one of radio resource control signaling, medium access control (MAC) control element signaling, or downlink control information signaling.

26. The UE according to any one of claims 22 to 25, wherein the configuration information indicates a semi-persistent scheduling (SPS) or a semi-static resource for a downlink channel associated with the MT-SDT operation, the semi-persistent scheduling (SPS) or the semi-static resource being based at least in part on satisfying a second one or more conditions, wherein the second one or more conditions include at least one of the following: a first condition associated with whether the communication including a radio resource control (RRC resume) message is successfully sent, a second condition, the second condition being associated with whether to report mobility information and a link quality status associated with the UE to the network node, a third condition associated with whether the indication is received from the network node for any subsequent downlink or uplink communication associated with the MT-SDT operation, a fourth condition, the fourth condition being associated with whether a measurement value of a downlink reference signal satisfies a threshold for link quality assessment and timing alignment timer verification, the threshold being configured for SPS or semi-static communication, a fifth condition, the fifth condition being associated with whether the UE is configured with valid uplink resources to provide hybrid automatic repeat request (HARQ) feedback associated with the MT-SDT operation, the hybrid automatic repeat request (HARQ) feedback occurring before an SDT timing alignment timer expires, a sixth condition, the sixth condition being associated with whether an SDT error detection timer has expired, the SDT error detection timer being started after an initial transmission or reception of the MT-SDT operation, or A seventh condition, the seventh condition is associated with whether the network node is a serving network node of the UE and is included in a radio access network (RAN) notification area (RNA) associated with the UE.

27. The UE according to any one of claims 17 to 26, wherein the MT-SDT operation is associated with a session, wherein the one or more processors are further configured to: Detecting termination events; and The session is terminated based at least in part on detecting the termination event.

28. The UE of claim 27, wherein to detect the termination event, the one or more processors are configured to detect at least one of: Prior to detecting or decoding a downlink control communication associated with said MT-SDT operation, an SDT inactivity timer has expired, The measured value of the downlink signal does not meet the SDT measurement value threshold, Prior to sending feedback information for downlink communications associated with the MT-SDT operation, an SDT timing alignment timer has expired, The geographical location of the UE is outside a Radio Access Network (RAN) Notification Area (RNA) associated with the MT-SDT operation, a system information communication or an emergency notification communication at least partially overlapping in the time domain with a downlink communication associated with the session, The SDT fault detection timer has expired. a number of physical random access channel (PRACH) preamble transmissions performed by the UE satisfies a threshold, a number of retransmissions performed by the UE satisfies a threshold, a response to the communication has not been received by the UE, or The power headroom of the UE does not meet the SDT power headroom threshold.

29. A network node for wireless communication, the network node comprising: Memory; and one or more processors coupled to the memory and configured to: sending, to a user equipment (UE), an indication that the UE will perform a mobile terminated (MT) small data transmission (SDT) (MT-SDT) operation; and In response to the indication, receiving a communication associated with the UE using: a first uplink resource associated with a mobile originated (MO) SDT (MO-SDT) configuration for use based at least in part on satisfying one or more conditions, or A second uplink resource associated with the random access configuration is used based at least in part on not satisfying the one or more conditions or based at least in part on not configuring a MO-SDT configuration for the UE.

30. The network node of claim 29, wherein the communication is included in a Radio Resource Control (RRC) resume request communication.

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