Performing mobile station called small data transmission (MT-SDT) in wireless network

Abstract

Methods, systems, and computer readable media are disclosed for performing operations including: receiving (204), by a user equipment (UE) (102) in an RRCINACTIVE state, a mobile station called small data transmission (MT-SDT) paging message from a base station of a wireless network; determining, by the UE, whether one or more conditions have been configured for transmitting data from the base station to the UE using MT-SDT; and performing at least one of: (i) upon determining that the one or more conditions have not been configured, transmitting (208), by the UE, an uplink (UL) response message to the base station indicating initiation of the MT-SDT, and receiving (210), by the UE, data from the base station using the MT-SDT, (ii) upon determining that the one or more conditions have been configured and the one or more configured conditions have been satisfied, transmitting (208), by the UE, the UL response message to the base station indicating the initiation of MT-SDT, and receiving (210), by the UE, data from the base station using MT-SDT, or (iii) upon determining that the one or more conditions have been configured and at least one of the one or more configured conditions has not been satisfied, receiving, by the UE, data from the base station in the RRCCONNECTED state.

Description

[0001] CROSS-REFERENCE TO RELATED APPLICATIONS

[0002] This application claims priority to U.S. Provisional Application No. 63 / 443,309, filed on February 3, 2023, entitled “PERFORMING MOBILE TERMINATED SMALLDATA TRANSMISSION (MT-SDT) IN A WIRELES S NETWORK,” which is incorporated herein by reference in its entirety. Background Art

[0003] Wireless communication networks provide an integrated communication platform and telecommunication services to wireless user devices. Example telecommunication services include telephony, data (e.g., voice, audio, and / or video data), messaging, Internet access, and / or other services. Wireless communication networks have radio access nodes that exchange wireless signals with wireless user devices using wireless network protocols, such as those described in various telecommunication standards promulgated by the Third Generation Partnership Project (3GPP). Summary of the Invention

[0004] According to one aspect of the present disclosure, a method includes: receiving, by a user equipment (UE) in an RRC_INACTIVE state, a mobile terminated small data transmission (MT-SDT) paging message from a base station of a wireless network; determining, by the UE, whether one or more conditions for transmitting data from the base station to the UE using MT-SDT have been configured; and performing at least one of the following: (i) when it is determined that the one or more conditions have not been configured, sending, by the UE, an uplink (UL) response message indicating initiation of MT-SDT to the base station, and receiving, by the UE, data from the base station using MT-SDT; (ii) when it is determined that the one or more conditions have been configured and the one or more configured conditions have been met, sending, by the UE, the UL response message indicating the initiation of MT-SDT to the base station, and receiving, by the UE, data from the base station using MT-SDT; or (iii) when it is determined that the one or more conditions have been configured and at least one of the one or more configured conditions has not been met, receiving, by the UE, data from the base station in an RRC_CONNECTED state.

[0005] Implementations of this aspect may include one or more of the following features.

[0006] In some implementations, the one or more conditions may include a first condition related to a radio quality of a wireless signal received by the UE from the base station.

[0007] In some implementations, the first condition is met when a reference signal received power (RSRP) of the wireless signal is greater than a threshold.

[0008] In some implementations, the first condition may be configured for both MT-SDT and Mobile Originated Small Data Transmission (MO-SDT).

[0009] In some implementations, the one or more conditions may include a second condition related to at least one of a radio bearer or a radio service used to exchange data between the base station and the UE.

[0010] In some implementations, the second condition is met when the UE determines that one or more resource blocks (RBs) indicated by the base station are configured for MT-SDT.

[0011] In some implementations, the one or more conditions can include a third condition related to selection of resources for sending the UL response message from the UE to the base station.

[0012] In some implementations, the third condition can include selecting the resource from among: a legacy random access channel (RACH) resource, a RACH resource specific to small data transmission (SDT), and a configuration grant (CG) resource specific to SDT.

[0013] In some implementations, the legacy RACH resource can be selected and can be different from one or more RACH resources specific to SDT.

[0014] In some implementations, the one or more conditions may be configured based on an RRC release message sent from the base station to the UE.

[0015] In some implementations, the one or more conditions can be configured based on the MT-SDT paging message.

[0016] In some implementations, the method may be performed by a user equipment (UE).

[0017] In some implementations, the method can be performed by at least one baseband processor.

[0018] On the other hand, a method includes: receiving, by a base station of a wireless network, data for transmission to a user equipment (UE), wherein the UE is in an RRC_INACTIVE state; sending, by the base station, a mobile station called small data transmission (MT-SDT) paging message to the UE; and performing at least one of the following: upon receiving an uplink (UL) response message indicating initiation of the MT-SDT by the UE, sending the data to the UE using the MT-SDT, or upon determining that the UE has entered the RRC_CONNECTED state, sending the data to the UE in the RRC_CONNECTED state.

[0019] Implementations of this aspect may include one or more of the following features.

[0020] In some specific implementations, the method may further include: sending, by the base station to the UE, configuration information indicating one or more conditions for transmitting the data from the base station to the UE using MT-SDT.

[0021] In some implementations, at least a portion of the configuration information may be sent from the base station to the UE via an RRC release message.

[0022] In some implementations, at least a portion of the configuration information may be sent from the base station to the UE via the MT-SDT paging message.

[0023] In some implementations, the one or more conditions may include a first condition related to a radio quality of a wireless signal received by the UE from the base station.

[0024] In some implementations, the first condition is met when a reference signal received power (RSRP) of the wireless signal is greater than a threshold.

[0025] In some implementations, the first condition can be configured for both MT-SDT and Mobile Originated Small Data Transfer (MO-SDT).

[0026] In some implementations, the one or more conditions may include a second condition related to at least one of a radio bearer or a radio service used to send data between the base station and the UE.

[0027] In some implementations, the second condition is met when the UE determines that one or more resource blocks (RBs) indicated by the base station are configured for MT-SDT.

[0028] In some implementations, the one or more conditions can include a third condition related to selection of resources for sending the UL response message from the UE to the base station.

[0029] In some implementations, the third condition can include selecting the resource from among: a legacy random access channel (RACH) resource, a RACH resource specific to small data transmission (SDT), and a configuration grant (CG) resource specific to SDT.

[0030] In some implementations, the legacy RACH resource can be selected and can be different from one or more RACH resources specific to SDT.

[0031] In some implementations, the base station can send the MT-SDT paging message in response to determining a resource block (RB) associated with the data to be sent to the UE, and determining that the RB is configured for MT-SDT.

[0032] In some implementations, the method may be performed by a base station.

[0033] In some implementations, the method can be performed by at least one baseband processor.

[0034] In another aspect, an apparatus includes one or more processors and one or more storage devices having stored thereon instructions that, when executed by the one or more processors, are operable to cause the one or more processors to perform any of the operations described herein.

[0035] In some implementations, the apparatus may be a UE.

[0036] In some implementations, the apparatus may be a base station.

[0037] In some implementations, the device can be a baseband processor.

[0038] In another aspect, a method includes receiving a paging message from a base station of a wireless network in an RRC_INACTIVE state, the paging message including a Mobile-Called Small Data Transmission (MT-SDT) indication; determining whether one or more conditions for exchanging data with the base station using MT-SDT are satisfied; and sending an uplink (UL) response message for initiating MT-SDT in the RRC_INACTIVE state based on a determination that the one or more conditions are satisfied.

[0039] Implementations of this aspect may include one or more of the following features.

[0040] In some implementations, the one or more conditions can include a first condition related to a radio quality of a wireless signal received from the base station.

[0041] In some implementations, the first condition may be satisfied when a reference signal received power (RSRP) of the wireless signal is greater than a threshold.

[0042] In some implementations, the first condition can be configured for both MT-SDT and Mobile Originated Small Data Transfer (MO-SDT).

[0043] In some implementations, the one or more conditions can include a second condition related to selection of resources for sending the UL response message to the base station.

[0044] In some implementations, the second condition can include selecting the resource from among: a legacy random access channel (RACH) resource, a RACH resource specific to small data transmission (SDT), and a configuration grant (CG) resource specific to SDT.

[0045] In some implementations, the legacy RACH resource can be selected and can be different from one or more RACH resources specific to SDT.

[0046] In some implementations, the method may include determining that the first condition is not satisfied, and initiating an RRC recovery process in response to determining that the first condition is not satisfied.

[0047] In some implementations, the UL response message can be sent using one or more resources selected based on a configuration received from the base station.

[0048] In some implementations, the configuration received from the base station can be an RRC-specific configuration.

[0049] In some implementations, the configuration received from the base station can be a system information block (SI B) broadcast configuration.

[0050] In some implementations, the method may be performed by a user equipment (UE).

[0051] In another aspect, a method includes sending a paging message including a mobile station called small data transmission (MT-SDT) indication to a UE in an RRC-INACITVE state; and receiving an uplink (UL) response message initiating an MT-SDT from the UE in the RRC-IN ACITVE state based on satisfying one or more conditions for exchanging data with the UE using the MT-SDT.

[0052] Implementations of this aspect may include one or more of the following features.

[0053] In some implementations, the one or more conditions may include a first condition related to a radio quality of a wireless signal received by the UE.

[0054] In some implementations, the first condition may be satisfied when a reference signal received power (RSRP) of the wireless signal is greater than a threshold.

[0055] In some implementations, the first condition can be configured for both MT-SDT and Mobile Originated Small Data Transfer (MO-SDT).

[0056] In some implementations, the one or more conditions can include a second condition related to selection by the UE of resources for sending the UL response message.

[0057] In some implementations, the second condition can include selecting the resource from among: a legacy random access channel (RACH) resource, a RACH resource specific to small data transmission (SDT), and a configuration grant (CG) resource specific to SDT.

[0058] In some implementations, the UE can select the legacy RACH resource, and the legacy RACH resource can be different from one or more RACH resources specific to SDT.

[0059] In some implementations, the method may include receiving data for transmission to the UE, and transmitting the data to the UE using MT-SDT.

[0060] In some implementations, the method may be performed by a base station.

[0061] In some implementations, the method can be performed by at least one baseband processor.

[0062] In another aspect, a method includes any of the operations described herein.

[0063] In another aspect, one or more baseband processors may be configured to perform any of the operations described herein.

[0064] In another aspect, a non-transitory computer storage medium is encoded with instructions that, when executed by one or more processors, cause the one or more processors to perform any of the operations described herein.

[0065] The details of one or more embodiments of these systems and methods are set forth in the accompanying drawings and description below. Other features, objects, and advantages of these systems and methods will be apparent from the description and drawings, and from the claims. BRIEF DESCRIPTION OF THE DRAWINGS

[0066] Figure 1An example wireless network is illustrated.

[0067] Figure 2 An example procedure for initiating Mobile-Terminated Small Data Transmission (MT-SDT) between a user equipment (UE) and a base station is illustrated.

[0068] Figure 3 An example procedure for determining whether MT-SDT is triggered by a UE is illustrated.

[0069] Figures 4A to 4D A flow chart illustrating an example method is shown.

[0070] Figure 5 An example UE is illustrated.

[0071] Figure 6 An example access node is illustrated. DETAILED DESCRIPTION

[0072] This disclosure sets forth various techniques for facilitating Mobile Station-Small Data Transmission (MT-SDT) in wireless networks, such as cellular networks.

[0073] In an example implementation, a base station of a wireless network sends a paging message (e.g., an MT-SDT paging message) to a user equipment (UE), indicating that data can be sent from the base station to the UE according to MT-SDT. Upon receiving the paging message, the UE determines whether to receive data from the base station according to MT-SDT or, instead, to receive data from the base station according to conventional procedures. In some implementations, the UE may make this determination based on one or more conditions specified by the wireless network (e.g., one or more conditions indicated in configuration information sent from the base station to the UE) and / or based on other considerations.

[0074] Figure 1 Illustrated is a wireless network 100 according to some implementations. The wireless network 100 includes a UE 102 and a base station 104 connected via one or more channels 106A, 106B across an air interface 108. The UE 102 and base station 104 communicate using a system that supports control for managing the UE's 102 access to the network via the base station 104.

[0075] In some implementations, the wireless network 100 may be a non-standalone (NSA) network that combines Long Term Evolution (LTE) and Fifth Generation (5G) New Radio (NR) communication standards as defined by the Third Generation Partnership Project (3GPP) technical specifications. For example, the wireless network 100 may be an E-UTRA (Evolved Universal Terrestrial Radio Access)-NR dual connectivity (EN-DC) network or an NR-EUTRA dual connectivity (NE-DC) network. However, the wireless network 100 may also be a standalone (SA) network that only combines 5G NR. In addition, other types of communication standards are possible, including future 3GPP systems (e.g., sixth generation (6G) systems), Institute of Electrical and Electronics Engineers (IEEE) 802.11 technologies (e.g., IEEE 802.11a; IEEE 802.11b; IEEE 802.11g; IEEE 802.11-2007; IEEE 802.11n; IEEE 802.11-2012; IEEE 802.11ac; or other currently or future developed IEEE 802.11 technologies), IEEE 802.16 protocols (e.g., WMAN, WiMAX, etc.), etc. Although various aspects may be described herein using terms generally associated with 5G NR, various aspects of the present disclosure may be applicable to other systems, such as 3G, 4G, and / or systems after 5G (e.g., 6G).

[0076] In wireless network 100, UE 102 and any other UEs in the system can be, for example, laptops, smartphones, tablets, machine-type devices (such as smart meters or specialized devices for healthcare, intelligent transportation systems), or any other wireless device with or without a user interface. In network 100, base station 104 provides network connectivity to a broader network (not shown) for UE 102. This UE 102 connectivity is provided via an air interface 108 within the base station service area provided by base station 104. In some implementations, this broader network can be a wide area network operated by a cellular network provider, or it can be the Internet. Each base station service area associated with base station 104 is supported by an antenna integrated with base station 104. The service area is divided into multiple sectors associated with certain antennas. Such sectors can be physically associated with fixed antennas, or can be assigned to physical areas with tunable antennas or antenna settings that can be adjusted in a beamforming process used to direct signals to specific sectors.

[0077] UE 102 includes control circuitry 110 coupled to transmit circuitry 112 and receive circuitry 114. Transmit circuitry 112 and receive circuitry 114 may each be coupled to one or more antennas. Control circuitry 110 may include various combinations of dedicated circuitry and baseband circuitry. Transmit circuitry 112 and receive circuitry 114 may be adapted to transmit and receive data, respectively, and may include radio frequency (RF) circuitry or front-end module (FEM) circuitry.

[0078] In various implementations, aspects of transmit circuitry 112, receive circuitry 114, and control circuitry 110 may be integrated in various ways to implement the operations described herein. Control circuitry 110 may be adapted or configured to perform various operations, such as those described elsewhere in this disclosure with respect to a UE.

[0079] The transmit circuitry 112 may perform various operations described herein. Additionally, the transmit circuitry 112 may transmit a plurality of multiplexed uplink physical channels. The plurality of uplink physical channels may be multiplexed according to time division multiplexing (TDM) or frequency division multiplexing (FDM) as well as carrier aggregation. The transmit circuitry 112 may be configured to receive block data from the control circuitry 110 for transmission across the air interface 108.

[0080] The receiving circuit 114 can perform various operations described in this specification. Additionally, the receiving circuit 114 can receive multiple multiplexed downlink physical channels from the air interface 108 and relay these physical channels to the control circuit 110. The multiple downlink physical channels can be multiplexed according to TDM or FDM and carrier aggregation. The transmitting circuit 112 and the receiving circuit 114 can transmit and receive both control data and content data (e.g., messages, images, videos, etc.) structured within the data blocks carried by the physical channels.

[0081] Figure 1 Also illustrated is a base station 104. In a specific implementation, the base station 104 can be an NG radio access network (RAN) or 5G RAN, E-UTRAN, a non-terrestrial cell, or a traditional RAN such as UTRAN or GERAN. As used herein, the term "NG RAN" or the like can refer to a base station 104 operating in an NR or 5G wireless network 100, and the term "E-UTRAN" or the like can refer to a base station 104 operating in an LTE or 4G wireless network 100. The UE 102 utilizes connections (or channels) 106A, 106B, each of which includes a physical communication interface or layer.

[0082] Base station 104 circuitry may include control circuitry 116 coupled to transmit circuitry 118 and receive circuitry 120. Transmit circuitry 118 and receive circuitry 120 may each be coupled to one or more antennas that may be used to enable communication over air interface 108. Transmit circuitry 118 and receive circuitry 120 may be adapted to transmit and receive data, respectively, to any UE connected to base station 104. Transmit circuitry 118 may transmit downlink physical channels including a plurality of downlink subframes. Receive circuitry 120 may receive a plurality of uplink physical channels from various UEs, including UE 102.

[0083] exist Figure 1 In the embodiment, one or more channels 106A, 106B are illustrated as air interfaces for implementing communication coupling and may conform to a cellular communication protocol, such as a GSM protocol, a CDMA network protocol, a UMTS protocol, a 3GPP LTE protocol, an advanced long term evolution (LTE-A) protocol, an LTE-based unlicensed spectrum access (LTE-U), a 5G protocol, a NR protocol, an NR-based unlicensed spectrum access (NR-U) protocol and / or any other communication protocol discussed herein. In a specific implementation, the UE 102 may directly exchange communication data via a ProSe interface. The ProSe interface may alternatively be referred to as a sidelink (SL) interface and may include one or more logical channels, including but not limited to a physical sidelink control channel (PSCCH), a physical sidelink control channel (PSCCH), a physical sidelink discovery channel (PSDCH), and a physical sidelink broadcast channel (PSBCH).

[0084] In some implementations, the UE 102 and the base station 104 can exchange data with each other according to conventional data transmission procedures, whereby the UE 102 is in a radio resource control (RRC) “connected” state (e.g., an “RRC_CONNECT ED” state) when transmitting data to and / or receiving data from the base station 104. For example, the UE 102 can initially be in an RRC “idle” or “inactive” state (e.g., an “RRC_IDLE” state or an “RRC_INACTIVE” state). Upon determining that data is to be transmitted from the base station 104 to the UE 102 according to conventional data transmission procedures, the UE 102 can transition to an RRC_CONNECTED state and receive data from the UE 102 while in the RRC_CONNECTED state. Similarly, upon determining that data is to be transmitted from the UE 102 to the base station 104 according to conventional data transmission procedures, the UE 102 can also transition to an RRC_CONNECTED state and transmit data to the base station 104 while in the RRC_CONNECTED state. Upon completion of the data exchange, UE 102 may remain in the RRC_CONNECTED state or transition back to the RRC_IDLE state or the RRC_INACTIVE state (eg, upon being released back to the RRC_IDLE state or the RRC_INACTIVE state by base station 104).

[0085] In some implementations, the UE 102 and the base station 104 can exchange data with each other according to a small data transmission (SDT) procedure, whereby the UE 102 is in an RRC_INACTIVE state when transmitting data to and / or receiving data from the base station 104. For example, the UE 102 can initially be in the RRC_INACTIVE state. Upon determining that data is to be transmitted from the base station 104 to the UE 102 according to the SDT procedure, the UE 102 can remain in the RRC_INACTIVE state and receive data from the UE 102 (e.g., without transitioning to an RRC_CONNECTED state). Similarly, upon determining that data is to be transmitted from the UE 102 to the base station 104 according to the SDT procedure, the UE 102 can also remain in the RRC_INACTIVE state and transmit data to the base station 104 (e.g., without transitioning to an RRC_CONNECTED state).

[0086] In some implementations, an SDT session that begins with a data transmission (e.g., an uplink data transmission) from the UE 102 to the base station 104 can be referred to as a mobile-originated small data transmission (MO-SDT). For example, upon receiving data for transmission to the base station 104, the UE 102 can trigger the MO-SDT and transmit the data to the base station 104 in the RRC_INACTIVE state. Subsequently, the UE 102 and the base station 104 can exchange additional data and / or uplink data using SDT.

[0087] In some implementations, an SDT session that begins with a data transmission (e.g., a downlink data transmission) from the base station 104 to the UE 102 can be referred to as a mobile-transferred small data transmission (MT-SDT). For example, upon receiving data for transmission to the UE 102, the base station 104 can trigger the MO-SDT and transmit the data to the UE 102 while the UE 102 is in the RRC_INACTIVE state. Subsequently, the UE 102 and the base station 104 can exchange downlink data and / or uplink data using SDT.

[0088] For example, data transmission using SDT can be beneficial in enabling data to be exchanged between UE 102 and base station 104 in a more efficient manner (e.g., compared to data transmission not using SDT, such as in the RRC_CONNECTED state). For example, UE 102 and / or base station 104 may consume certain resources (e.g., network resources, computing resources, memory resources, etc.) when transitioning UE 102 to and / or maintaining it in the RRC_CONNECTED state. This resource overhead can be eliminated or otherwise reduced by instead using SDT to transmit data (e.g., by avoiding or otherwise reducing the frequency with which UE 102 operates in the RRC_CONNECTED state).

[0089] In some implementations, resources can include resources in a network physical layer (e.g., "PHY") in the time / frequency domain, the code domain, or a combination thereof.

[0090] Figure 2 An example process 200 for initiating and performing SDT (eg, MT-SDT) between a UE 102 and a base station 104 is shown.

[0091] According to process 200, base station 104 receives downlink data (202) intended for transmission to UE 102. As an example, the downlink data can be received from a core network (CN) of a wireless network. In some implementations, the downlink data can be data provided by another device or system of the wireless network (e.g., another UE, a base station, or any other system or device of the wireless network) to the CN for delivery to UE 102.

[0092] Upon receiving the downlink data, the base station 104 identifies the corresponding UE 102 (e.g., the intended recipient of the downlink data) and sends a paging message 204 to the UE 102. The paging message indicates that data is available for transmission from the base station 104 to the UE 102 and that the data can be sent via MT-SDT. In some implementations, the paging message can be referred to as an MT-SDT paging message. In some implementations, the UE 102 can receive the paging message 204 while in the RRC_INACTIVE or RRC_IDLE state.

[0093] Upon receiving the paging message, UE 102 determines whether to initiate (or "trigger") MT-SDT (206). In some implementations, the UE can make this determination based on one or more conditions specified by the wireless network (e.g., one or more conditions indicated in configuration information sent from base station 104 to UE 102) and / or based on other considerations. An example process for determining whether to trigger MT-SDT is described in further detail below.

[0094] If UE 102 determines that MT-SDT should be triggered, UE 102 sends an uplink response message to base station 104, such as Figure 2 As shown (208). As an example, the uplink response message can indicate that UE 102 is available to receive data using MT-SDT (e.g., when UE 102 is in RRC_INACTIVE state). In some implementations, the uplink response message can indicate one or more network resources that can be used to receive data using MT-SDT. In addition, UE 102 performs MT-SDT procedures to prepare to receive data from base station 104. As part of the MT-SDT procedure, UE 102 can transition to (or remain in) RRC_INACTIVE state.

[0095] Upon receiving the uplink resource message, base station 104 transmits downlink data using MT-SDT to UE 102 (210). During the transmission of downlink data, UE 102 may remain in the RRC_INACTIVE state (eg, rather than transitioning to the RRC_CONNECTED state).

[0096] Alternatively, if UE 102 determines that MT-SDT should not be triggered, UE 102 initiates reception of data using conventional procedures ( Figure 2 As an example, UE 102 may transition to an RRC_CONNECTED state (e.g., by performing an RRC recovery procedure) and, while in the RRC_CONNECTED state, receive downlink data from base station 104. Furthermore, upon completion of the data exchange, UE 102 may remain in the RRC_CONNECTED state or transition back to the RRC_IDLE state or the RRC_INACTIVE state (e.g., upon being released by base station 104 to the RRC_IDLE state or the RRC_INACTIVE state).

[0097] Figure 3 1 shows a method for determining whether MT-SDT is triggered by UE 102 (e.g., in conjunction with Figure 2 206) of example process 300.

[0098] According to process 300, UE 102 receives a paging message (e.g., MT-SDT paging message) from base station 104 (block 302). This process may be similar to that described in reference to FIG. Figure 2 The process described in block 204 of FIG.

[0099] Upon receiving the paging message, UE 102 determines whether any conditions have been configured for receiving data using MT-SDT, and if so, whether those conditions have been met (block 304). In some implementations, at least one of the conditions may relate to the radio quality of wireless signals received by UE 102 from base station 104. In some implementations, at least one of the conditions may relate to a radio bearer and / or radio service used to transmit data between base station 104 and UE 102. In some implementations, at least one of the conditions may relate to selection of resources for transmitting an uplink response message from UE 102 to base station 104. Example conditions are described in further detail below.

[0100] In some implementations, at least some of the conditions can be specified in configuration information sent from the base station 104 to the UE 102. For example, at least some of the conditions can be signaled by the base station 104 to the UE 102 via RRC signaling (e.g., via an RRCRelease message sent from the base station 104 to the UE 102). As another example, at least some of the conditions can be signaled by the base station 104 to the UE 102 in a paging message (e.g., an MT-SDT paging message) sent from the base station 104 to the UE 102.

[0101] When it is determined that all conditions are met, the UE 102 initiates an MT-SDT procedure for receiving data from the base station 102 (block 306). Figure 2 As described, UE 102 may send an uplink response message to base station 102 indicating that UE 102 is available to receive data using MT-SDT. Additionally, UE 102 may remain in (or transition to) the RRC_INACTIVE state to receive data using MT-SDT.

[0102] Alternatively, upon determining that at least one of the conditions is not satisfied, the UE 102 initiates a conventional process for receiving data from the base station 102 (block 308). Figure 2 As described, UE 102 may transition to an RRC_CONNECTED state (eg, by performing an RRC recovery procedure) and receive downlink data from a base station while in the RRC_CONNECTED state.

[0103] As described above, UE 102 may determine whether to trigger MT-SDT based on one or more conditions. Example conditions and operations are described in further detail below.

[0104] Example radio quality conditions

[0105] In some implementations, at least one of the conditions can be related to the radio quality of the wireless signal received by UE 102 from base station 104.

[0106] As an example, the condition may specify that the signal is received when the reference signal received power (RSRP) of the wireless signal received from the base station 104 is greater than a threshold (eg, RSRP>RSRP 阈值 ), UE 102 may initiate MT-SDT. As another example, the condition may specify that when the reference signal received power (RSRP) of the wireless signal received from base station 104 is greater than or equal to a threshold (e.g., RSRP ≥ RSRP 阈值 ), UE 102 may initiate MT-SDT.

[0107] In some implementations, if no conditions regarding radio quality are configured (e.g., none of the configurations specify radio quality conditions for initiating MT-SDT), the UE 102 may assume that such conditions are met and initiate MT-SDT as long as the remaining conditions (if any) are met. Furthermore, the UE 102 may select resources for sending an uplink response message to the base station 104 and / or receiving data via MT-SDT using a legacy random access channel (RACH) procedure. For example, the UE 102 may select legacy random access (RA) resources for sending an uplink response message to the base station 104 and / or receiving data via MT-SDT.

[0108] Example radio quality conditions

[0109] In some implementations, at least one of the conditions can relate to a radio bearer and / or a radio service used to transmit data between the base station 104 and the UE 102 .

[0110] As an example, in some implementations, the base station 104 can trigger MT-SDT paging to the UE 102 only when downlink data arrives at an MT-SDT resource block (MT-SDT-RB). The base station 104 can signal the MT-SDT-RB to the UE 102 using various techniques. For example, the base station 104 can configure the MT-SDT-RB to the UE 102 via an RRCRelease message with SuspendConfig. As another example, the base station 104 can notify the UE 102 of the MT-SDT-RB via an MT-SDT paging message. As another example, the base station 104 can both (i) configure the MT-SDT-RB to the UE 102 via an RRCRelease message with SuspendConfig and (ii) notify the UE 102 of the MT-SDT-RB via an MT-SDT paging message.

[0111] In an implementation where the base station 104 configures the MT-SDT-RB to the UE 102 only via the RRCRelease message with SuspendConfig, the UE 102 may initiate MT-SDT upon receiving the MT-SDT paging message (assuming all other conditions are met). When the UE 102 initiates the MT-SDT procedure, the UE 102 may re-establish and resume the indicated MT-SDT-RB for MT-SDT data reception.

[0112] In an implementation where the base station 104 notifies the UE 102 of the MT-SDT-RB only via an MT-SDT paging message, the UE 102 may initiate MT-SDT upon receiving the MT-SDT paging message (assuming all other conditions are met). When the UE 102 initiates the MT-SDT process, the UE 102 may re-establish and resume the indicated MT-SDT-RB for MT-SDT data reception.

[0113] In a specific implementation in which the base station both (i) configures an MT-SDT-RB to the UE 102 via an RRCRelease message with SuspendConfig and (ii) notifies the UE 102 of the MT-SDT-RB via an MT-SDT paging message, upon receiving the MT-SDT paging message, the UE 102 initially checks whether the indicated RB is configured for the MT-SDT-RB. If the indicated RB is not a configured MT-SDT-RB or the MT-SDT paging message does not include RB information, the UE initiates a conventional RRC recovery procedure. Otherwise, the UE 102 initiates an MT-SDT procedure and resumes the MT-SDT RB for MT-SDT data reception. When resuming the MT-SDT RB for MT-SDT data reception, the UE 102 may either (i) resume the indicated RB or (ii) resume all configured MT-SDT RBs.

[0114] In at least some implementations, if UE 102 receives data indicating an RB that is not in the set of configured MT-SDT-RBs, UE 102 can assume that a failure occurred during the MT-SDT procedure and transition to the RRC_IDLE state.

[0115] Example radio quality conditions

[0116] In some implementations, at least one of the conditions can relate to selection of resources for sending an uplink response message from UE 102 to base station 104.

[0117] In general, UE 102 may select from among different resources for sending an uplink response message to base station 104. Example resources include legacy RACH resources, SDT-specific RACH resources (SDT-RA), and / or SDT-specific configuration grant (CG) resources (SDT-CG).

[0118] In some implementations, a condition may specify a process for selecting between different RA types based on radio quality. As an example, a condition may specify that when radio quality is greater than a threshold (e.g., RSRP>RSRP 阈值 ) and / or greater than or equal to a threshold (e.g., RSRP ≥ RSRP 阈值 ), UE 102 will select SDT specific RA resources. As another example, the condition may specify that when the radio quality is less than a threshold (e.g., RSRP <RSRP 阈值 ), UE 102 will select traditional RA resources. As another example, the condition may specify that when the radio quality is less than a threshold (e.g., RSRP <RSRP 阈值), UE 102 will assume that there are no available RACH resources for MT-SDT.

[0119] In some implementations, radio quality conditions can be configured per resource type. For example, UE 102 can be configured to select a particular resource type when radio quality conditions for that resource type are met. If conditions for more than one resource type are met, UE 102 can select a resource type based on implementation-specific or predefined / configured rules. For example, UE 102 can select a resource type based on a particular priority (e.g., SDT-RA resources have the highest priority, followed by SDT-RA resources, followed by legacy RA resources). As another example, UE 102 can assume that no available RACH resources are available for MT-SDT.

[0120] In some implementations, resources can be selected based on conditions associated with the radio bearer. For example, base station 104 can configure UE 102 with an association between (i) one or more MT-SDT-RBs and (ii) specific resources and / or resource types. If UE 102 can obtain MT-SDT-RB information from MT-SDT paging, UE 102 can select the indicated resources and / or resource types accordingly.

[0121] Additional sample conditions

[0122] In some implementations, at least one of the conditions can be related to concurrently configuring MT-SDT and MO-SDT.

[0123] In some implementations, the same conditions can be shared for both MT-SDT and MO-SDT.

[0124] As an example, at least one condition may specify a radio quality threshold for SDT (eg, both MT-SDT and MO-SDT), such as a threshold on RSRP (eg, as described above).

[0125] As another example, at least one condition may specify that only certain radio bearers are permitted for SDT transmission (eg, both MT-SDT and MO-SDT).

[0126] As another example, at least one condition may specify SDT-RA and / or CG-SDT resource selection for SDT transmission (eg, both MT-SDT and MO-SDT).

[0127] In some implementations, certain conditions may only apply to MO-SDT. For example, at least one condition may specify an SDT data volume threshold, such as the amount of data to be transmitted should be below a specific threshold amount for triggering MO-SDT.

[0128] In some implementations, certain conditions may only apply to MT-SDT. For example, at least one condition may specify the selection of legacy RA resources for UL response transmission.

[0129] Although example conditions are described separately herein, in practice, any condition may be implemented alone or in combination with one or more other conditions. In addition, other conditions may be implemented in addition to or in place of those described herein.

[0130] Example method:

[0131] Figure 4A A flow chart of an example method 400 is illustrated. For clarity of presentation, the following description generally describes the method 400 in the context of the other figures in this specification. For example, the method 400 may be performed at least in part by Figure 1 and Figure 5 1 and / or UE 500. It should be understood that method 400 can be performed, for example, by any suitable system, environment, software, hardware, or a combination of systems, environments, software, and hardware. In some implementations, the various steps of method 400 can be executed in parallel, in combination, in a loop, or in any order.

[0132] According to the method 400, a UE receives an MT-SDT paging message from a base station of a wireless network in an RRC_INACTIVE state (block 402).

[0133] Additionally, the UE determines whether one or more conditions for transmitting data from the base station to the UE using MT-SDT have been configured (block 404).

[0134] In addition, the UE performs at least one of the following: (i) when it is determined that one or more conditions have not been configured, the UE sends an uplink (UL) response message indicating the initiation of MT-SDT to the base station, and the UE receives data from the base station using MT-SDT, (ii) when it is determined that one or more conditions have been configured and one or more configured conditions have been met, the UE sends an UL response message indicating the initiation of MT-SDT to the base station, and the UE receives data from the base station using MT-SDT, or (iii) when it is determined that one or more conditions have been configured and at least one of the one or more configured conditions has not been met, the UE receives data from the base station in RRC_CONNECT ED state (box 406).

[0135] In some implementations, the one or more conditions may include a first condition related to a radio quality of a wireless signal received by the UE from the base station. In some implementations, the first condition is satisfied when a reference signal received power (RSRP) of the wireless signal is greater than a threshold.

[0136] In some implementations, the one or more conditions may include a second condition related to at least one of a radio bearer or a radio service used to transmit data between the base station and the UE. In some implementations, the second condition is satisfied when the UE determines that one or more resource blocks (RBs) indicated by the base station are configured for MT-SDT.

[0137] In some implementations, the one or more conditions may include a third condition related to selection of resources for sending an UL response message from the UE to the base station. In some implementations, the third condition may include selecting resources from among: legacy random access channel (RACH) resources, RACH resources specific to small data transmission (SDT), and configuration grant (CG) resources specific to SDT.

[0138] In some implementations, one or more conditions can be configured based on an RRC release message sent from the base station to the UE.

[0139] In some implementations, one or more conditions can be configured based on an MT-SDT paging message.

[0140] In some implementations, the first condition can be configured for both MT-SDT and Mobile Originated Small Data Transfer (MO-SDT).

[0141] In some implementations, a legacy RACH resource can be selected, and the legacy RACH resource can be different from one or more RACH resources specific to SDT.

[0142] In some implementations, method 400 can be performed by a user equipment (UE).

[0143] In some implementations, method 400 can be performed by at least one baseband processor.

[0144] Figure 4B A flow chart illustrating an example method 420 is shown. For clarity of presentation, the following description generally describes the method 420 in the context of other figures in this specification. For example, the method 420 may be at least partially performed by Figure 1 and Figure 64 and / or the access node 600 shown in FIG. 4. It should be understood that the method 420 may be performed by any suitable system, environment, software, hardware, or a combination of systems, environments, software, and hardware, as appropriate. In some implementations, the various steps of the method 420 may be performed in parallel, in combination, in a loop, or in any order.

[0145] According to the method 420, a base station receives data for transmission to a user equipment (UE), wherein the UE is in an RRC_INACTIVE state (block 422).

[0146] Additionally, the base station sends an MT-SDT paging message to the UE (block 424).

[0147] In addition, the base station performs at least one of: (i) upon receiving an uplink (UL) response message indicating initiation of MT-SDT by the UE, sending data to the UE using MT-SDT, or (ii) upon determining that the UE has entered the RRC_CONNECTED state, sending data to the UE in the RRC_CONNECTED state (block 426).

[0148] In some specific implementations, the method may further include: sending, by the base station to the UE, configuration information indicating one or more conditions for transmitting data from the base station to the UE using MT-SDT.

[0149] In some implementations, at least a portion of the configuration information can be sent from the base station to the UE via an RRC release message.

[0150] In some implementations, at least a portion of the configuration information can be sent from the base station to the UE via an MT-SDT paging message.

[0151] In some implementations, the one or more conditions may include a first condition related to a radio quality of a wireless signal received by the UE from the base station. In some implementations, the first condition is satisfied when a reference signal received power (RSRP) of the wireless signal is greater than a threshold.

[0152] In some implementations, the one or more conditions may include a second condition related to at least one of a radio bearer or a radio service used to transmit data between the base station and the UE. In some implementations, the second condition is satisfied when the UE determines that one or more resource blocks (RBs) indicated by the base station are configured for MT-SDT.

[0153] In some implementations, the one or more conditions may include a third condition related to selection of resources for sending an UL response message from the UE to the base station. In some implementations, the third condition may include selecting resources from among: legacy random access channel (RACH) resources, RACH resources specific to small data transmission (SDT), and configuration grant (CG) resources specific to SDT.

[0154] In some implementations, the base station can send the MT-SDT paging message in response to determining resource blocks (RBs) associated with data to be sent to the UE and determining that the RBs are configured for MT-SDT.

[0155] In some implementations, the first condition can be configured for both MT-SDT and Mobile Originated Small Data Transfer (MO-SDT).

[0156] In some implementations, a legacy RACH resource can be selected, and the legacy RACH resource can be different from one or more RACH resources specific to SDT.

[0157] In some implementations, method 420 can be performed by a base station.

[0158] In some implementations, method 420 can be performed by at least one baseband processor.

[0159] Figure 4C A flow chart illustrating an example method 440 is shown. For clarity of presentation, the following description generally describes the method 440 in the context of the other figures in this specification. For example, the method 440 may be at least partially performed by Figure 1 and Figure 5 1 and / or UE 500. It should be understood that the method 440 can be performed by any suitable system, environment, software, hardware, or a combination of systems, environments, software, and hardware, as appropriate. In some implementations, the various steps of the method 440 can be executed in parallel, in combination, in a loop, or in any order.

[0160] According to the method 440, the device receives a paging message from a base station of a wireless network in an RRC_INACTIVE state, the paging message including a Mobile-Paged Small Data Transmission (MT-SDT) indication (block 442).

[0161] The device determines whether one or more conditions are met for exchanging data with a base station using MT-SDT (block 444).

[0162] The apparatus sends an uplink (UL) response message for initiating MT-SDT in an RRC_INACTIVE state based on a determination that one or more conditions are satisfied (block 446).

[0163] In some implementations, the one or more conditions can include a first condition related to a radio quality of a wireless signal received from the base station.

[0164] In some implementations, the first condition may be satisfied when a reference signal received power (RSRP) of the wireless signal is greater than a threshold.

[0165] In some implementations, the first condition can be configured for both MT-SDT and Mobile Originated Small Data Transfer (MO-SDT).

[0166] In some implementations, the one or more conditions can include a second condition related to selection of resources for sending the UL response message to the base station.

[0167] In some implementations, the second condition can include selecting resources from among: legacy random access channel (RACH) resources, RACH resources specific to small data transmission (SDT), and configuration grant (CG) resources specific to SDT.

[0168] In some implementations, a legacy RACH resource can be selected, and the legacy RACH resource can be different from one or more RACH resources specific to SDT.

[0169] In some implementations, the method may include determining that a first condition is not satisfied, and initiating an RRC recovery procedure in response to determining that the first condition is not satisfied.

[0170] In some implementations, the UL response message can be sent using one or more resources selected based on a configuration received from the base station.

[0171] In some implementations, the configuration received from the base station can be an RRC-specific configuration.

[0172] In some implementations, the configuration received from the base station can be a system information block (SIB) broadcast configuration.

[0173] Figure 4D A flow chart illustrating an example method 460 is shown. For clarity of presentation, the following description generally describes the method 460 in the context of the other figures in this specification. For example, the method 460 may be at least partially performed by Figure 1 and Figure 64 and / or the access node 600 shown in FIG. 4. It should be understood that the method 460 may be performed by any suitable system, environment, software, hardware, or a combination of systems, environments, software, and hardware, as appropriate. In some implementations, the various steps of the method 460 may be performed in parallel, in combination, in a loop, or in any order.

[0174] According to the method 460, the device sends a paging message including a Mobile-Called Small Data Transmission (MT-SDT) indication to a UE in an RRC-INACITVE state (block 462).

[0175] Additionally, the device receives an uplink (UL) response message from the UE in the RRC-INACITVE state to initiate MT-SDT, wherein the UL response message is based on satisfying one or more conditions for exchanging data with the UE using MT-SDT (block 464).

[0176] In some implementations, the one or more conditions can include a first condition related to a radio quality of a wireless signal received by the UE.

[0177] In some implementations, the first condition may be satisfied when a reference signal received power (RSRP) of the wireless signal is greater than a threshold.

[0178] In some implementations, the first condition can be configured for both MT-SDT and Mobile Originated Small Data Transfer (MO-SDT).

[0179] In some implementations, the one or more conditions can include a second condition related to selection by the UE of resources for sending the UL response message.

[0180] In some implementations, the second condition can include selecting resources from among: legacy random access channel (RACH) resources, RACH resources specific to small data transmission (SDT), and configuration grant (CG) resources specific to SDT.

[0181] In some implementations, the UE can select legacy RACH resources, and the legacy RACH resources can be different from one or more RACH resources specific to SDT.

[0182] In some implementations, a method can include receiving data for transmission to a UE, and transmitting the data to the UE using MT-SDT.

[0183] In some implementations, method 460 can be performed by a base station.

[0184] In some implementations, method 460 can be performed by at least one baseband processor.

[0185] Example systems and devices:

[0186] Figure 5 UE 500 according to some implementations is illustrated. UE 500 may be similar to Figure 1 UE 102 and is essentially interchangeable therewith.

[0187] UE 500 can be any mobile or non-mobile computing device, such as, for example, a mobile phone, a computer, a tablet, an industrial wireless sensor (e.g., a microphone, a pressure sensor, a thermometer, a motion sensor, an accelerometer, an inventory sensor, a voltage / current meter, etc.), a video device (e.g., a camera, a camcorder, etc.), a wearable device (e.g., a smart watch), or a loose IoT device.

[0188] UE 500 may include a processor 502, RF interface circuitry 504, memory / storage 506, a user interface 508, sensors 510, driver circuitry 512, a power management integrated circuit (PMIC) 514, antenna structures 516, and a battery 518. The components of UE 500 may be implemented as integrated circuits (ICs), portions of integrated circuits, discrete electronic devices or other modules, logic components, hardware, software, firmware, or combinations thereof. Figure 5 The block diagram is intended to show a simplified view of some of the components of UE 500. However, some of the components shown may be omitted, additional components may be present, and different arrangements of the components shown may occur in other implementations.

[0189] The components of UE 500 may be coupled to various other components via one or more interconnects 520, which may represent any type of interface, input / output, bus (local, system, or extension), transmission line, trace, optical connection, etc., that allows various circuit components (on a common or different chip or chipset) to interact with each other.

[0190] The processor 502 may include processor circuits such as, for example, a baseband processor circuit (BB) 522A, a central processor unit circuit (CPU) 522B, and a graphics processor unit circuit (GPU) 522C. The processor 502 may include any type of circuit or processor circuit that executes or otherwise operates computer-executable instructions (such as program code, software modules, or functional processes from the memory / storage device 506) to cause the UE 500 to perform operations as described herein.

[0191] In some implementations, the baseband processor circuit 522A can access the communication protocol stack 524 in the memory / storage 506 to communicate over a 3GPP-compliant network. Generally speaking, the baseband processor circuit 522A can access the communication protocol stack to perform user plane functions at the physical (PHY) layer, the medium access control (MAC) layer, the radio link control (RLC) layer, the packet data convergence protocol (PDCP) layer, the service data adaptation protocol (SDAP) layer, and the PDU layer; and to perform control plane functions at the PHY layer, the MAC layer, the RLC layer, the PDCP layer, the RRC layer, and the non-access stratum layer. In some implementations, PHY layer operations can additionally / alternatively be performed by components of the RF interface circuit 504. The baseband processor circuit 522A can generate or process baseband signals or waveforms that carry information in the 3GPP-compliant network. In some implementations, the waveform used for NR can be based on cyclic prefix orthogonal frequency division multiplexing (OFDM) "CP-OFDM" in the uplink or downlink, and discrete Fourier transform spread OFDM "DFT-S-OFDM" in the uplink.

[0192] The memory / storage 506 may include one or more non-transitory computer-readable media containing instructions (e.g., the communication protocol stack 524) that are executable by one or more processors in the processor 502 to cause the UE 500 to perform the various operations described herein. The memory / storage 506 includes any type of volatile or non-volatile memory that may be distributed throughout the UE 500. In some implementations, some of the memory / storage 506 may be located on the processor 502 itself (e.g., L1 cache and L2 cache), while other memory / storage 506 may be external to the processor 502 but accessible via a memory interface. The memory / storage 506 may include any suitable volatile or non-volatile memory, such as, but not limited to, dynamic random access memory (DRAM), static random access memory (SRAM), erasable programmable read-only memory (EPROM), electrically erasable programmable read-only memory (EEPROM), flash memory, solid-state memory, or any other type of memory device technology.

[0193] The RF interface circuit 504 may include a transceiver circuit and a radio frequency front-end module (RFEM) that allow the UE 500 to communicate with other devices via a radio access network. The RF interface circuit 504 may include various components arranged in a transmit path or a receive path. These components may include, for example, switches, mixers, amplifiers, filters, synthesizer circuits, control circuits, and the like.

[0194] In the receive path, the RFEM receives the radiated signal from the air interface via the antenna structure 516 and further filters and amplifies the signal (using a low-noise amplifier). The signal is provided to the transceiver's receiver, which downconverts the RF signal to a baseband signal, which is provided to the baseband processor of the processor 502.

[0195] In the transmit path, the transceiver's transmitter upconverts the baseband signal received from the baseband processor and provides an RF signal to the RFEM. The RFEM may amplify the RF signal through a power amplifier before radiating it across the air interface via the antenna 516. In various implementations, the RF interface circuit 504 may be configured to transmit and receive signals in a manner compatible with NR access technology.

[0196] Antenna 516 may include antenna elements to convert electrical signals into radio waves to travel through the air and convert received radio waves into electrical signals. These antenna elements may be arranged into one or more antenna panels. Antenna 516 may have antenna panels that are omnidirectional, directional, or a combination thereof to enable beamforming and multiple-input, multiple-output communications. Antenna 516 may include microstrip antennas, printed antennas fabricated on the surface of one or more printed circuit boards, patch antennas, phased array antennas, and the like. Antenna 516 may have one or more panels designed for a specific frequency band, including a band in FR1 or FR2.

[0197] User interface 508 includes various input / output (I / O) devices designed to enable a user to interact with UE 500. User interface 508 includes input device circuitry and output device circuitry. Input device circuitry includes any physical or virtual component for accepting input, including, in particular, one or more physical or virtual buttons (e.g., a reset button), a physical keyboard, a keypad, a mouse, a touchpad, a touch screen, a microphone, a scanner, or a head-mounted device. Output device circuitry includes any physical or virtual component for displaying or otherwise conveying information (such as sensor readings, actuator positions, or other similar information). Output device circuitry may include any number or combination of audio or visual displays, including, in particular, one or more simple visual outputs / indicators (e.g., binary state indicators such as light-emitting diodes (LEDs) and multi-character visual outputs), or more complex outputs such as a display device or touch screen (e.g., a liquid crystal display (LCD), an LED display, a quantum dot display, a projector, etc.), where the output of characters, graphics, multimedia objects, etc. is generated or produced by the operation of UE 500.

[0198] Sensors 510 may include devices, modules, or subsystems whose purpose is to detect events or changes in their environment and to communicate information about the detected events (sensor data) to some other device, module, subsystem, etc. Examples of such sensors include, among others: an inertial measurement unit including an accelerometer, gyroscope, or magnetometer; a microelectromechanical system or nanoelectromechanical system including a three-axis accelerometer, three-axis gyroscope, or magnetometer; a fluid level sensor; a temperature sensor (e.g., a thermistor); a pressure sensor; an image capture device (e.g., a camera or lensless aperture); a light detection and ranging sensor; a proximity sensor (e.g., an infrared radiation detector, etc.); a depth sensor; an ambient light sensor; an ultrasonic transceiver; a microphone or other similar audio capture device; and the like.

[0199] The driver circuit 512 may include software and hardware elements that operate to control specific devices embedded in, attached to, or otherwise communicatively coupled to the UE 500. The driver circuit 512 may include various drivers to allow other components to interact with or control various input / output (I / O) devices that may be present in or connected to the UE 500. For example, the driver circuit 512 may include a display driver for controlling and allowing access to a display device, a touch screen driver for controlling and allowing access to a touch screen interface, a sensor driver for obtaining sensor readings from the sensor circuit 510 and controlling and allowing access to the sensor circuit 510, a driver for obtaining actuator positioning of an electromechanical component or controlling and allowing access to an electromechanical component, a camera driver for controlling and allowing access to an embedded image capture device, and an audio driver for controlling and allowing access to one or more audio devices.

[0200] The PMIC 514 may manage the power provided to various components of the UE 500. Specifically, with respect to the processor 502, the PMIC 514 may control power source selection, voltage scaling, battery charging, or DC-DC conversion.

[0201] In some implementations, the PMIC 514 can control or otherwise be part of various power saving mechanisms of the UE 500. A battery 518 can power the UE 500, but in some examples, the UE 500 can be installed in a fixed location and have a power source coupled to the grid. The battery 518 can be a lithium-ion battery, a metal-air battery such as a zinc-air battery, an aluminum-air battery, a lithium-air battery, or the like. In some implementations, such as in vehicle-based applications, the battery 518 can be a typical lead-acid automotive battery.

[0202] Figure 6An access node 600 (e.g., a base station or gNB) is illustrated according to some implementations. Access node 600 can be similar to base station 104 and substantially interchangeable therewith. Access node 600 can include a processor 602, RF interface circuitry 604, core network (CN) interface circuitry 606, memory / storage circuitry 608, and antenna structures 610.

[0203] The components of access node 600 may be coupled to various other components via one or more interconnects 612. Processor 602, RF interface circuitry 604, memory / storage circuitry 608 (including communication protocol stack 614), antenna structures 610, and interconnects 612 may be similar to those described with respect to FIG. Figure 5 Like-named elements are shown and described.For example, processor 602 may include processor circuits such as, for example, baseband processor circuitry (BB) 616A, central processor unit circuitry (CPU) 616B, and graphics processor unit circuitry (GPU) 616C.

[0204] The CN interface circuitry 606 can provide connectivity to a core network (e.g., a 5th Generation Core Network (5GC) using a 5GC-compatible network interface protocol, such as a Carrier Ethernet protocol or some other suitable protocol). Network connectivity can be provided to / from the access node 600 via optical fiber or wireless backhaul. The CN interface circuitry 606 can include one or more dedicated processors or FPGAs for communicating using one or more of the aforementioned protocols. In some implementations, the CN interface circuitry 606 can include multiple controllers for providing connectivity to other networks using the same or different protocols.

[0205] As used herein, the terms "access node," "access point," and the like may describe equipment that provides radio baseband functionality for data and / or voice connections between a network and one or more users. These access nodes may be referred to as BSs, gNBs, RAN nodes, eNBs, NodeBs, RSUs, TRxPs, or TRPs, and may include ground stations (e.g., terrestrial access points) or satellite stations that provide coverage within a geographic area (e.g., a cell). As used herein, the terms "NG RAN node" and the like may refer to access nodes 600 (e.g., gNBs) operating in NR or 5G systems, and the terms "E-UTRAN node" and the like may refer to access nodes 600 (e.g., eNBs) operating in LTE or 4G systems. Depending on the implementation, access node 600 may be implemented as one or more of the following: a dedicated physical device such as a macrocell base station, and / or a low-power (LP) base station for providing femtocells, picocells, or other similar cells with smaller coverage areas, smaller user capacity, or higher bandwidth than macrocells.

[0206] In some implementations, all or part of the access node 600 may be implemented as one or more software entities running on a server computer as part of a virtual network that may be referred to as a CRAN and / or a virtual baseband unit pool (vBBUP). In a V2X scenario, the access node 600 may be or function as a "roadside unit." The term "roadside unit" or "RSU" may refer to any traffic infrastructure entity used for V2X communication. The RSU may be implemented in or by a suitable RAN node or a stationary (or relatively stationary) UE, where an RSU implemented in or by a UE may be referred to as a "UE-type RSU," an RSU implemented in or by an eNB may be referred to as an "eNB-type RSU," an RSU implemented in or by a gNB may be referred to as a "gNB-type RSU," and so on.

[0207] For ease of description, various components may be described as performing one or more tasks. Such descriptions should be interpreted as including the phrase "configured to." Representing a component as being configured to perform one or more tasks expressly intends that the component not be interpreted under 35 U.S.C. §112(f).

[0208] For one or more embodiments, at least one of the components shown in one or more of the foregoing figures may be configured to perform one or more operations, techniques, processes, or methods described in the Examples section below. For example, the baseband circuitry described above in conjunction with one or more of the foregoing figures may be configured to operate according to one or more of the examples described below. For another example, circuitry associated with the UE, base station, network element, etc. described above in conjunction with one or more of the foregoing figures may be configured to operate according to one or more of the examples described below in the Examples section.

[0209] Another embodiment:

[0210] In the following sections, additional exemplary embodiments are provided.

[0211] Embodiment A1 includes a method comprising: receiving, by a user equipment (UE) in an RRC_INACTIVE state, a mobile station called small data transmission (MT-SDT) paging message from a base station of a wireless network; determining, by the UE, whether one or more conditions for transmitting data from the base station to the UE using MT-SDT have been configured; and performing at least one of the following: (i) when it is determined that the one or more conditions have not been configured, sending, by the UE, an uplink (UL) response message indicating the initiation of MT-SDT to the base station, and receiving, by the UE, data from the base station using MT-SDT, (ii) when it is determined that the one or more conditions have been configured and the one or more configured conditions have been met, sending, by the UE, the UL response message indicating the initiation of MT-SDT to the base station, and receiving, by the UE, data from the base station using MT-SDT, or (iii) when it is determined that the one or more conditions have been configured and at least one of the one or more configured conditions has not been met, receiving, by the UE, data from the base station in an RRC_CONNECTED state.

[0212] Embodiment A2 includes the method of embodiment A1. Additionally, the one or more conditions include a first condition related to a radio quality of a wireless signal received by the UE from the base station.

[0213] Embodiment A3 includes the method of embodiment A2. Additionally, the first condition is satisfied when a reference signal received power (RSRP) of the wireless signal is greater than a threshold.

[0214] Embodiment A4 includes the method of embodiment 3. Additionally, the first condition is configured for both MT-SDT and Mobile Originated Small Data Transmission (MO-SDT).

[0215] Embodiment A5 includes the method of embodiment A1. Additionally, the one or more conditions include a second condition related to at least one of a radio bearer or a radio service used to transmit data between the base station and the UE.

[0216] Embodiment A6 includes the method of embodiment A5. Additionally, the second condition is met when the UE determines that one or more resource blocks (RBs) indicated by the base station are configured for MT-SDT.

[0217] Embodiment A7 includes the method of embodiment A1. Additionally, the one or more conditions include a third condition related to selection of resources for sending the UL response message from the UE to the base station.

[0218] Embodiment A8 includes the method of embodiment A7. Additionally, the third condition includes selecting the resource from among: a legacy random access channel (RACH) resource, a RACH resource specific to small data transmission (SDT), and a configuration grant (CG) resource specific to SDT.

[0219] Embodiment A9 includes the method of embodiment A8. Additionally, a legacy RACH resource is selected, and the legacy RACH resource is different from the one or more RACH resources specific to SDT.

[0220] Embodiment A10 includes the method of embodiment A1. Additionally, the one or more conditions are configured based on an RRC release message sent from the base station to the UE.

[0221] Embodiment A11 includes the method of embodiment A1. Additionally, the one or more conditions are configured based on the MT-SDT paging message.

[0222] Embodiment A12 includes the method of any one of embodiments A1 to A11, wherein the method is performed by a UE.

[0223] Embodiment A13 includes the method of any one of embodiments A1 to A11, wherein the method is performed by a baseband processor.

[0224] Embodiment B1 includes an apparatus comprising one or more processors and one or more storage devices, wherein the one or more storage devices store instructions that, when executed by the one or more processors, are operable to cause the one or more processors to perform a method according to any one of embodiments A1 to A13.

[0225] Embodiment B2 includes the apparatus of embodiment B 1, wherein the apparatus is a baseband processor.

[0226] Embodiment B3 includes the apparatus of embodiment B2, wherein the apparatus is a baseband processor.

[0227] Embodiment C1 includes a non-transitory computer storage medium encoded with instructions that, when executed by one or more processors, cause the one or more processors to perform the method of any one of Embodiments A1 to A13.

[0228] Embodiment D1 comprises an apparatus comprising one or more baseband processors configured to perform the method of any one of embodiments A1 to A13.

[0229] Embodiment E1 includes a method comprising: receiving, by a base station of a wireless network, data for transmission to a user equipment (UE), wherein the UE is in an RRC_INACTIVE state; sending, by the base station, a mobile station called small data transmission (MT-SDT) paging message to the UE; and performing at least one of the following: (i) upon receiving an uplink (UL) response message indicating initiation of the MT-SDT by the UE, sending the data to the UE using the MT-SDT, or (ii) upon determining that the UE has entered the RRC_CONNECTED state, sending the data to the UE in the RRC_CONNECTED state.

[0230] Embodiment E2 includes the method of embodiment E1. Furthermore, the method includes sending, by the base station to the UE, configuration information indicating one or more conditions for transmitting the data from the base station to the UE using MT-SDT.

[0231] Embodiment E3 includes the method of embodiment E2. Additionally, at least a portion of the configuration information is sent from the base station to the UE via an RRC release message.

[0232] Embodiment E4 includes the method of embodiment E2. Additionally, at least a portion of the configuration information is sent from the base station to the UE via the MT-SDT paging message.

[0233] Embodiment E5 includes the method of embodiment E2. Additionally, the one or more conditions include a first condition related to a radio quality of a wireless signal received by the UE from the base station.

[0234] Embodiment E6 includes the method of embodiment E5. Additionally, the first condition is satisfied when a reference signal received power (RSRP) of the wireless signal is greater than a threshold.

[0235] Embodiment E7 includes the method of embodiment E6. Additionally, the first condition is configured for both MT-SDT and Mobile Originated Small Data Transfer (MO-SDT).

[0236] Embodiment E8 includes the method of embodiment E2. Additionally, the one or more conditions include a second condition related to at least one of a radio bearer or a radio service used to transmit data between the base station and the UE.

[0237] Embodiment E9 includes the method of embodiment E8. Additionally, the second condition is met when the UE determines that one or more resource blocks (RBs) indicated by the base station are configured for MT-SDT.

[0238] Embodiment E10 includes the method of embodiment E2. Additionally, the one or more conditions include a third condition related to selection of resources for sending the UL response message from the UE to the base station.

[0239] Embodiment E11 includes the method of embodiment E10. Additionally, the third condition includes selecting the resource from among: a legacy random access channel (RACH) resource, a RACH resource specific to small data transmission (SDT), and a configuration grant (CG) resource specific to SDT.

[0240] Embodiment E12 includes the method of embodiment E1. Additionally, a legacy RACH resource is selected, and the legacy RACH resource is different from the one or more RACH resources specific to SDT.

[0241] Embodiment E13 includes the method of embodiment E1. Additionally, the base station sends the MT-SDT paging message in response to determining a resource block (RB) associated with the data for transmission to the UE and determining that the RB is configured for MT-SDT.

[0242] Embodiment E14 includes the method of any one of embodiments E1 to E13, wherein the method is performed by a base station.

[0243] Embodiment E15 includes the method of any one of embodiments E1 to E13, wherein the method is performed by a baseband processor.

[0244] Embodiment F1 includes an apparatus comprising one or more processors and one or more storage devices, wherein the one or more storage devices have instructions stored thereon, the instructions being operable, when executed by the one or more processors, to cause the one or more processors to perform a method according to any one of embodiments E1 to E11.

[0245] Embodiment F2 includes the apparatus of embodiment F1, wherein the apparatus is a baseband processor.

[0246] Embodiment F3 includes the apparatus of embodiment F1, wherein the apparatus is a base station.

[0247] Embodiment G1 includes a non-transitory computer storage medium encoded with instructions that, when executed by one or more processors, cause the one or more processors to perform the method of any one of embodiments E1 to E15.

[0248] Embodiment H1 comprises an apparatus comprising one or more baseband processors configured to perform the method of any one of embodiments E1 to E15.

[0249] Embodiment H1 includes a method comprising: receiving a paging message from a base station of a wireless network in an RRC_INACTIVE state, the paging message including a mobile station called small data transmission (MT-SDT) indication; determining whether one or more conditions for exchanging data with the base station using MT-SDT are met; and based on a determination that the one or more conditions are met, sending an uplink (UL) response message for initiating MT-SDT in the RRC_INACTIVE state.

[0250] Embodiment H2 includes the method of embodiment H 1. Additionally, the one or more conditions include a first condition related to a radio quality of a wireless signal received from the base station.

[0251] Embodiment H3 includes the method of embodiment H2. In addition, the first condition is met when a reference signal received power (RSRP) of the wireless signal is greater than a threshold.

[0252] Embodiment H4 includes the method of embodiment H2. Additionally, the first condition is configured for both MT-SDT and Mobile Originated Small Data Transmission (MO-SDT).

[0253] Embodiment H5 includes the method of embodiment H2. Additionally, the one or more conditions include a second condition related to selection of resources for sending the UL response message to the base station.

[0254] Embodiment H6 includes the method of embodiment H5. In addition, the second condition includes selecting the resource from among: a legacy random access channel (RACH) resource, a RACH resource specific to small data transmission (SDT), and a configuration grant (CG) resource specific to SDT.

[0255] Embodiment H7 includes the method of embodiment H6. Additionally, the legacy RACH resources are selected, and wherein the legacy RACH resources are different from one or more RACH resources specific to SDT.

[0256] Embodiment H8 includes the method of embodiment H2. Furthermore, the method includes determining that the first condition is not satisfied, and in response to determining that the first condition is not satisfied, initiating an RRC recovery procedure.

[0257] Embodiment H9 includes the method of embodiment H 1. Additionally, the UL response message is sent using one or more resources selected based on a configuration received from the base station.

[0258] Embodiment H10 includes the method of embodiment E9. Additionally, the configuration received from the base station is an RRC-specific configuration.

[0259] Embodiment H11 includes the method of embodiment E9. Additionally, the configuration received from the base station is a system information block (SIB) broadcast configuration.

[0260] Embodiment I1 includes an apparatus comprising one or more processors and one or more storage devices, wherein the one or more storage devices store instructions that, when executed by the one or more processors, are operable to cause the one or more processors to perform a method according to any one of embodiments H1 to H11.

[0261] Embodiment I2 includes the apparatus of embodiment I1. Additionally, the apparatus is a baseband processor.

[0262] Embodiment I3 includes the apparatus of embodiment I1. In addition, the apparatus is a UE.

[0263] Embodiment J1 includes a non-transitory computer storage medium encoded with instructions that, when executed by one or more processors, cause the one or more processors to perform the method of any one of embodiments H1 to H11.

[0264] Embodiment K1 includes a method comprising: sending a paging message including a mobile station called small data transmission (MT-SDT) indication to a UE in an RRC-INACITVE state; and receiving an uplink (UL) response message for initiating MT-SDT from the UE in the RRC-INACITVE state based on satisfying one or more conditions for exchanging data with the UE using MT-SDT.

[0265] Embodiment K2 includes the method of embodiment K 1. Additionally, the one or more conditions include a first condition related to a radio quality of a wireless signal received by the UE.

[0266] Embodiment K3 includes the method of embodiment K2. In addition, the first condition is met when a reference signal received power (RSRP) of the wireless signal is greater than a threshold.

[0267] Embodiment K4 includes the method of embodiment K2. In addition, the first condition is configured for both MT-SDT and Mobile Originated Small Data Transmission (MO-SDT).

[0268] Embodiment K5 includes the method of embodiment K2. Additionally, the one or more conditions include a second condition related to selection by the UE of resources for sending the UL response message.

[0269] Embodiment K6 includes the method of embodiment K5. In addition, the second condition includes selecting the resource from among: a legacy random access channel (RACH) resource, a RACH resource specific to small data transmission (SDT), and a configuration grant (CG) resource specific to SDT.

[0270] Embodiment K7 includes the method of embodiment K6. Additionally, the UE selects the legacy RACH resource, and wherein the legacy RACH resource is different from one or more RACH resources specific to SDT.

[0271] Embodiment K8 includes the method of embodiment K1. Additionally, the method includes receiving data for transmission to the UE, and transmitting the data to the UE using MT-SDT.

[0272] Embodiment K9 includes the method of any one of embodiments K1 to K8, wherein the method is performed by a base station.

[0273] Embodiment K10 includes the method of any one of embodiments K1 to K8, wherein the method is performed by a baseband processor.

[0274] Embodiment L1 includes an apparatus comprising one or more processors and one or more storage devices, wherein the one or more storage devices store instructions that, when executed by the one or more processors, are operable to cause the one or more processors to perform a method according to any one of embodiments K1 to K10.

[0275] Embodiment L2 includes the apparatus of embodiment L1, wherein the apparatus is a baseband processor.

[0276] Embodiment L3 includes the apparatus of embodiment L1, wherein the apparatus is a base station.

[0277] Embodiment M1 includes a non-transitory computer storage medium encoded with instructions that, when executed by one or more processors, cause the one or more processors to perform the method of any one of embodiments K1 to K10.

[0278] Unless expressly stated otherwise, any of the embodiments described above may be combined with any other embodiment (or combination of embodiments). The foregoing description of one or more specific implementations provides illustration and description, but is not intended to be exhaustive or to limit the scope of the embodiments to the precise forms disclosed. Modifications and variations are possible in light of the above teachings or may be acquired from practice of the various embodiments.

[0279] Although the above embodiments have been described in considerable detail, numerous variations and modifications will become apparent to those skilled in the art once the above disclosure is fully appreciated. It is intended that the following claims be interpreted to encompass all such variations and modifications.

[0280] It is understood that the use of personally identifiable information should be subject to privacy policies and practices that are generally recognized to meet or exceed industry or government requirements for maintaining user privacy. Specifically, personally identifiable information data should be managed and processed to minimize the risk of unintentional or unauthorized access or use, and the nature of authorized use should be clearly stated to users.

Claims

1. A method comprising: Receiving a Mobile Station Called Small Data Transmission (MT-SDT) paging message from a base station of a wireless network in the RRC_INACTIVE state; determining whether one or more conditions for transmitting data from the base station using MT-SDT have been configured; as well as Do at least one of the following: (i) when determining that the one or more conditions have not been configured, sending an uplink (UL) response message indicating initiation of MT-SDT to the base station, and receiving data from the base station using MT-SDT, (ii) upon determining that the one or more conditions have been configured and the one or more configured conditions have been satisfied, sending the UL response message indicating the initiation of MT-SDT to the base station, and receiving data from the base station using MT-SDT, or (iii) upon determining that the one or more conditions have been configured and at least one of the one or more configured conditions has not been satisfied, receiving data from the base station in the RRC_CONNECTED state. 2 . The method according to claim 1 , wherein the one or more conditions include a first condition related to radio quality of a wireless signal received from the base station.

3. The method according to claim 2, wherein the first condition is met when a reference signal received power (RSRP) of the wireless signal is greater than a threshold. 4 . The method of claim 3 , wherein the first condition is configured for both MT-SDT and Mobile Originated Small Data Transmission (MO-SDT). 5 . The method of claim 1 , wherein the one or more conditions include a second condition related to at least one of a radio bearer or a radio service used to exchange data with the base station. 6 . The method according to claim 5 , wherein the second condition is satisfied when it is determined that one or more resource blocks (RBs) indicated by the base station are configured for MT-SDT.

7. The method of claim 1, wherein the one or more conditions include a third condition related to selection of resources for sending the UL response message to the base station.

8. The method of claim 7, wherein the third condition comprises selecting the resource from among: Traditional random access channel (RACH) resources, RACH resources specific to small data transmission (SDT), and SDT-specific Configuration Grant (CG) resources.

9. The method of claim 8, wherein the legacy RACH resource is selected, and wherein the legacy RACH resource is different from one or more RACH resources specific to SDT.

10. The method of claim 1, wherein the one or more conditions are configured based on an RRC release message sent from the base station.

11. The method of claim 1, wherein the one or more conditions are configured based on the MT-SDT paging message.

12. The method according to any one of claims 1 to 11, wherein the method is performed by a user equipment (UE).

13. The method according to any one of claims 1 to 11, wherein the method is performed by at least one baseband processor.

14. An apparatus comprising one or more processors and one or more storage devices, wherein the one or more storage devices have stored thereon instructions that, when executed by the one or more processors, are operable to cause the one or more processors to perform the method according to any one of claims 1 to 13. The apparatus of claim 14 , wherein the apparatus is a baseband processor.

16. The apparatus of claim 14, wherein the apparatus is a user equipment (UE).

17. A non-transitory computer storage medium encoded with instructions that, when executed by one or more processors, cause the one or more processors to perform the method of any one of claims 1 to 13.

18. A method comprising: receiving data for transmission to a user equipment (UE), wherein the UE is in an RRC_INACTIVE state; Sending a Mobile Station-Demanded Small Data Send (MT-SDT) paging message to the UE; as well as Do at least one of the following: upon receiving an uplink (UL) response message indicating initiation of MT-SDT by the UE, sending the data to the UE using MT-SDT, or When it is determined that the UE has entered the RRC_CONNECTED state, the data is sent to the UE in the RRC_CONNECTED state.

19. The method according to claim 18, further comprising: Configuration information is sent to the UE, where the configuration information indicates one or more conditions for transmitting the data to the UE using MT-SDT.

20. The method of claim 19, wherein at least a portion of the configuration information is sent to the UE via an RRC release message.

21. The method of claim 19, wherein at least a portion of the configuration information is sent to the UE via the MT-SDT paging message.

22. The method of claim 19, wherein the one or more conditions include a first condition related to a radio quality of a wireless signal received by the UE.

23. The method of claim 22, wherein the first condition is satisfied when a reference signal received power (RSRP) of the wireless signal is greater than a threshold.

24. The method of claim 22, wherein the first condition is configured for both MT-SDT and Mobile Originated Small Data Transfer (MO-SDT).

25. The method of claim 19, wherein the one or more conditions include a second condition related to at least one of a radio bearer or a radio service used to transmit data to the UE.

26. The method of claim 25, wherein the second condition is satisfied when the UE determines that one or more indicated resource blocks (RBs) are configured for MT-SDT.

27. The method of claim 19, wherein the one or more conditions include a third condition related to selection of resources for sending the UL response message from the UE.

28. The method of claim 27, wherein the third condition comprises selecting the resource from among: Traditional random access channel (RACH) resources, RACH resources specific to small data transmission (SDT), and SDT-specific Configuration Grant (CG) resources.

29. The method of claim 28, wherein the legacy RACH resource is selected, and wherein the legacy RACH resource is different from one or more RACH resources specific to SDT.

30. The method of claim 18, wherein the MT-SDT paging message is sent in response to: determining a resource block (RB) associated with the data for transmission to the UE, and It is determined that the RB is configured for MT-SDT.

31. The method according to any one of claims 18 to 30, wherein the method is performed by a base station.

32. The method according to any one of claims 18 to 30, wherein the method is performed by at least one baseband processor.

33. An apparatus comprising one or more processors and one or more storage devices, the one or more storage devices having stored thereon instructions operable when executed by the one or more processors to cause the one or more processors to perform the method according to any one of claims 18 to 32.

34. The apparatus of claim 33, wherein the apparatus is a baseband processor.

35. The apparatus of claim 33, wherein the apparatus is a base station.

36. A non-transitory computer storage medium encoded with instructions that, when executed by one or more processors, cause the one or more processors to perform the method of any one of claims 18 to 32.

37. A method comprising: receiving a paging message from a base station of the wireless network in an RRC_INACTIVE state, the paging message including a Mobile Station Called Small Data Transmission (MT-SDT) indication; determining whether one or more conditions for exchanging data with the base station using MT-SDT are satisfied; as well as Based on a determination that the one or more conditions are satisfied, an uplink (UL) response message for initiating MT-SDT is sent in the RRC_INACTIVE state.

38. The method of claim 37, wherein the one or more conditions include a first condition related to a radio quality of a wireless signal received from the base station.

39. The method of claim 38, wherein the first condition is satisfied when a reference signal received power (RSRP) of the wireless signal is greater than a threshold.

40. The method of claim 38, wherein the first condition is configured for both MT-SDT and Mobile Originated Small Data Transfer (MO-SDT).

41. The method of claim 38, wherein the one or more conditions include a second condition related to selection of resources for transmitting the UL response message to the base station.

42. The method of claim 41 , wherein the second condition comprises selecting the resource from among: Traditional random access channel (RACH) resources, RACH resources specific to small data transmission (SDT), and SDT-specific Configuration Grant (CG) resources.

43. The method of claim 42, wherein the legacy RACH resource is selected, and wherein the legacy RACH resource is different from one or more RACH resources specific to SDT.

44. The method of claim 38, further comprising: determining that the first condition is not satisfied, and In response to determining that the first condition is not satisfied, an RRC recovery procedure is initiated.

45. The method of claim 37, wherein the UL response message is sent using one or more resources selected based on a configuration received from the base station.

46. ​​The method of claim 45, wherein the configuration received from the base station is an RRC-specific configuration.

47. The method of claim 45, wherein the configuration received from the base station is a system information block (SIB) broadcast configuration.

48. The method according to any one of claims 37 to 47, wherein the method is performed by a user equipment (UE).

49. The method of any one of claims 37 to 47, wherein the method is performed by at least one baseband processor.

50. An apparatus comprising one or more processors and one or more storage devices, the one or more storage devices having instructions stored thereon, the instructions being operable when executed by the one or more processors to cause the one or more processors to perform the method according to any one of claims 37 to 47.

51. The apparatus of claim 50, wherein the apparatus is a baseband processor.

52. The apparatus of claim 50, wherein the apparatus is a user equipment (UE).

53. A non-transitory computer storage medium encoded with instructions that, when executed by one or more processors, cause the one or more processors to perform the method of any one of claims 37 to 49.

54. A method comprising: Sending a paging message including a Mobile Station Called Small Data Send (MT-SDT) indication to a UE in the RRC-INACITVE state; as well as An uplink (UL) response message initiating MT-SDT is received from the UE in the RRC-INACITVE state based on satisfying one or more conditions for exchanging data with the UE using MT-SDT.

55. The method of claim 54, wherein the one or more conditions include a first condition related to a radio quality of a wireless signal received by the UE.

56. The method of claim 55, wherein the first condition is satisfied when a reference signal received power (RSRP) of the wireless signal is greater than a threshold.

57. The method of claim 55, wherein the first condition is configured for both MT-SDT and Mobile Originated Small Data Transfer (MO-SDT).

58. The method of claim 55, wherein the one or more conditions include a second condition related to selection by the UE of resources for sending the UL response message.

59. The method of claim 58, wherein the second condition comprises selecting the resource from among: Traditional random access channel (RACH) resources, RACH resources specific to small data transmission (SDT), and SDT-specific Configuration Grant (CG) resources.

60. The method of claim 59, wherein the UE selects the legacy RACH resource, and wherein the legacy RACH resource is different from one or more RACH resources specific to SDT.

61. The method of claim 54, further comprising: receiving data for transmission to the UE, and The data is sent to the UE using MT-SDT.

62. The method according to any one of claims 54 to 61, wherein the method is performed by a base station.

63. The method of any one of claims 54 to 61, wherein the method is performed by at least one baseband processor.

64. An apparatus comprising one or more processors and one or more storage devices, wherein the one or more storage devices have instructions stored thereon, the instructions being operable when executed by the one or more processors to cause the one or more processors to perform the method according to any one of claims 54 to 63.

65. The device of claim 54, wherein the device is a baseband processor.

66. The apparatus of claim 54, wherein the apparatus is a base station.

67. A non-transitory computer storage medium encoded with instructions that, when executed by one or more processors, cause the one or more processors to perform the method of any one of claims 54 to 63.

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