Patent Description:
Aspects of the present disclosure generally relate to wireless communication and to techniques for a high priority route selection descriptor selection timer.

Typical wireless communication systems may employ multiple-access technologies capable of supporting communication with multiple users by sharing available system resources (for example, bandwidth, transmit power, etc.).

The "downlink" (or forward link) refers to the communication link from the BS to the UE, and the "uplink" (or reverse link) refers to the communication link from the UE to the BS. As will be described in more detail herein, a BS may be referred to as a Node B, an LTE evolved nodeB (eNB), a gNB, an access point (AP), a radio head, a transmit receive point (TRP), a New Radio (NR) BS, a <NUM> NodeB, or the like.

Multiple access technologies have been adopted in various telecommunication standards to provide a common protocol that enables different UEs to communicate on a municipal, national, regional, and even global level. NR, which also may be referred to as <NUM>, is a set of enhancements to the LTE mobile standard promulgated by the 3GPP. NR is designed to better support mobile broadband Internet access by improving spectral efficiency, lowering costs, improving services, making use of new spectrum, and better integrating with other open standards using orthogonal frequency-division multiplexing (OFDM) with a cyclic prefix (CP) (CP-OFDM) on the downlink (DL), using CP-OFDM or SC-FDM (for example, also known as discrete Fourier transform spread OFDM (DFT-s-OFDM)) on the uplink (UL) (or a combination thereof), as well as supporting beamforming, multiple-input multiple-output (MIMO) antenna technology, and carrier aggregation.

<NPL>) relates to a UE procedure for associating applications to PDU sessions based on URSP. The document specifies establishing a new PDU session by a UE using values specified by a selected RSD within a URSP rule; if the PDU session is accepted, the UE associates an application executing on the UE with the new PDU session; if the PDU session request is rejected, the UE selects another comination of values in the currently selected RSD, i.e. the next RSD in the order of RSD precedence, i.e. priority.

<CIT> relates to establishing a PDU session for accessing a local data network by a UE based on URSP rules.

One innovative aspect of the subject matter described in this disclosure can be implemented in a method of wireless communication performed by an apparatus of a user equipment (UE). The method may include transmitting a first protocol data unit (PDU) session establishment request message to establish a first PDU session for an application associated with the UE. The method may include receiving a PDU session establishment accept message for the first PDU session based on the PDU session establishment request message. The method may include initiating a route selection descriptor (RSD) selection timer based on a first RSD priority associated with the first PDU session establishment request message being lower than a second RSD priority for the application. The method may include transmitting, after expiration of at least one of the RSD selection timer or a periodic re-evaluation timer, a second PDU session establishment request message to establish a second PDU session for the application. The second PDU session establishment request message may be associated with the second RSD priority.

In some aspects, the second RSD priority for the application is a highest RSD priority indicated in a UE route selection policy for the application. In some aspects, transmitting the second PDU session establishment request message to establish the second PDU session for the application includes transmitting the second PDU session establishment request message to establish the second PDU session while being connected to the first PDU session. In some aspects, the method further includes receiving a PDU session establishment accept message for the second PDU session based on the second PDU session establishment request message and releasing the first PDU session based on receiving the PDU session establishment accept message for the second PDU session.

In some aspects, the method further includes receiving a PDU session establishment reject message for the second PDU session based on the PDU session establishment request message, transmitting a third PDU session establishment request message to establish the second PDU session for the application, receiving a PDU session establishment accept message for the second PDU session based on the third PDU session establishment request message, and reinitiating the RSD selection timer based on a third RSD priority associated with the third PDU session establishment request message being lower than the second RSD priority for the application. In some aspects, a time duration of the RSD selection timer is greater than two minutes and less than a time duration of the periodic re-evaluation timer.

In some aspects, transmitting the second PDU session establishment request includes transmitting the second PDU session establishment request based on expiration of at least one of the RSD selection timer or a periodic re-evaluation timer. In some implementations, transmitting the second PDU session establishment request includes automatically transmitting the second PDU session establishment request based on expiration of at least one of the RSD selection timer or a periodic re-evaluation timer. In some aspects, transmitting the second PDU session establishment request includes transmitting the second PDU session establishment request based on receiving, via a user interface (UI) of the UE, input from a user indicating approval to transmit the second PDU session establishment request. In some aspects, the method includes displaying, after expiration of at least one of the RSD selection timer or a periodic re-evaluation timer, a request for approval to transmit the second PDU session establishment request, the request being displayed via the UI of the UE. In some aspects, receiving the input from the user indicating approval includes receiving the input from the user indicating approval based on displaying the request for approval. In some aspects a duration of the RSD selection timer duration is signaled to the UE by a network component. In some aspects, a duration of the RSD selection timer is based on user input received via the UI or based on a configuration of the UE.

Another innovative aspect of the subject matter described in this disclosure can be implemented in an apparatus of a UE for wireless communication. The apparatus of the UE may include a first interface to output a first signal for transmitting a first PDU session establishment request message to establish a first PDU session for an application associated with the UE. The apparatus of the UE may include the first interface or a second interface to obtain a PDU session establishment accept message for the first PDU session based on the PDU session establishment request message. The apparatus of the UE may include a processing system to initiate an RSD selection timer based on a first RSD priority associated with the first PDU session establishment request message being lower than a second RSD priority for the application. The apparatus of the UE may include the first interface to output a second signal for transmitting, after expiration of at least one of the RSD selection timer or a periodic re-evaluation timer, a second PDU session establishment request message to establish a second PDU session for the application. The second PDU session establishment request message may be associated with the second RSD priority. In some aspects, the apparatus of the UE may perform or implement any one or more of the aspects described in connection with the method above or elsewhere herein.

Another innovative aspect of the subject matter described in this disclosure can be implemented in a non-transitory computer-readable medium. The non-transitory computer-readable medium may store one or more instructions for wireless communication. The one or more instructions, when executed by one or more processors of a UE, may cause the one or more processors to transmit a first PDU session establishment request message to establish a first PDU session for an application associated with the UE. The one or more instructions, when executed by one or more processors of a UE, may cause the one or more processors to receive a PDU session establishment accept message for the first PDU session based on the PDU session establishment request message. The one or more instructions, when executed by one or more processors of a UE, may cause the one or more processors to initiate an RSD selection timer based on a first RSD priority associated with the first PDU session establishment request message being lower than a second RSD priority for the application. The one or more instructions, when executed by one or more processors of a UE, may cause the one or more processors to transmit, after expiration of at least one of the RSD selection timer or a periodic re-evaluation timer, a second PDU session establishment request message to establish a second PDU session for the application. The second PDU session establishment request message may be associated with the second RSD priority. In some aspects, the one or more instructions, when executed by one or more processors of the UE, may cause the one or more processors to perform or implement any one or more of the aspects described in connection with the method above or elsewhere herein.

Another innovative aspect of the subject matter described in this disclosure can be implemented in an apparatus for wireless communication. The apparatus may include means for means for transmitting a first PDU session establishment request message to establish a first PDU session for an application associated with the UE. The apparatus may include means for receiving a PDU session establishment accept message for the first PDU session based on the PDU session establishment request message. The apparatus may include means for initiating an RSD selection timer based on a first RSD priority associated with the first PDU session establishment request message being lower than a second RSD priority for the application. The apparatus may include means for transmitting, after expiration of at least one of the RSD selection timer or a periodic re-evaluation timer, a second PDU session establishment request message to establish a second PDU session for the application. The second PDU session establishment request message is associated with the second RSD priority. In some aspects, the apparatus may perform or implement any one or more of the aspects described in connection with the method above or elsewhere herein.

Aspects generally include a method, apparatus, system, computer program product, non-transitory computer-readable medium, user equipment, base station, wireless communication device, or processing system as substantially described herein with reference to and as illustrated by the accompanying drawings.

The following description is directed to certain implementations for the purposes of describing the innovative aspects of this disclosure. However, a person having ordinary skill in the art will readily recognize that the teachings herein can be applied in a multitude of different ways. Some of the examples in this disclosure are based on wireless and wired local area network (LAN) communication according to the Institute of Electrical and Electronics Engineers (IEEE) <NUM> wireless standards, the IEEE <NUM> Ethernet standards, and the IEEE <NUM> Powerline communication (PLC) standards. However, the described implementations may be implemented in any device, system or network that is capable of transmitting and receiving radio frequency signals according to any of the wireless communication standards, including any of the IEEE <NUM> standards, the Bluetooth® standard, code division multiple access (CDMA), frequency division multiple access (FDMA), time division multiple access (TDMA), Global System for Mobile communications (GSM), GSM/General Packet Radio Service (GPRS), Enhanced Data GSM Environment (EDGE), Terrestrial Trunked Radio (TETRA), Wideband-CDMA (W-CDMA), Evolution Data Optimized (EV-DO), 1xEV-DO, EV-DO Rev A, EV-DO Rev B, High Speed Packet Access (HSPA), High Speed Downlink Packet Access (HSDPA), High Speed Uplink Packet Access (HSUPA), Evolved High Speed Packet Access (HSPA+), Long Term Evolution (LTE), AMPS, or other known signals that are used to communicate within a wireless, cellular or internet of things (IOT) network, such as a system utilizing <NUM>, <NUM> or <NUM>, or further implementations thereof, technology.

A user equipment (UE) may configure a protocol data unit (PDU) session establishment parameter according the content of a selected route selection descriptor (RSD) for an application associated with the UE. The application may be a software application client installed on the UE or a cloud-based application accessed by the UE, such as a video application, a messaging application, a productivity application, a gaming application, a map or positioning application, or another type of application. Additionally, the application may be a software application or industrial application installed on an Internet of Things (IoT) device or a cloud-based application accessed by the IoT device or industrial IoT (IIoT) device, such as an automation application, an augmented reality (AR) or virtual reality (VR) application, an infrastructure application, a robotics-related application, a maintenance application, a security application, or another type of application. An RSD may have various components, such as a session service and continuity (SSC) mode, a network slice selection, a data network name (DNN), a PDU session type, or access type, among other examples.

The UE (or an application of the UE) may request a connection to a network slicing instance of a core network (such as a <NUM> core network) by transmitting a PDU session request to the core network (for example, a network controller of the core network implementing an access and mobility management (AMF) function). During a PDU session setup procedure, the UE may use an RSD (and the RSD components associated with the RSD) to set up a PDU session and to connect to a network slicing instance.

If the core network (for example, the network controller of the core network implementing the AMF function) rejects the PDU session establishment request (for example, for insufficient resources for a specific slice, for an unsupported SSC mode, or for insufficient resources for a specific slice and a DNN, among other examples), the PDU session is not established. The UE may retry the PDU session establishment request until the core network (for example, the network controller of the core network implementing the AMF function) accepts the request.

For each PDU session establishment request, the UE may try a different RSD according to a priority order. The core network (for example, the network controller of the core network implementing the AMF function) may reject a PDU session establishment request having a high RSD priority for load balancing purposes or for other reasons. The UE may first transmit a PDU session establishment request with a highest RSD priority for the application (for example, as indicated in a UE route selection policy (URSP) for the application) and may continue with subsequent PDU session establishment requests in a descending RSD priority. If a PDU session establishment request having an RSD priority that is lower than the highest RSD priority for the application is accepted, the PDU session is established and the UE is given no opportunity to request PDU session establishment with a higher RSD priority. The PDU session with the lower RSD priority may result in poor user experience for the application, reduced data rates and reliability for the application, or increased latency for the application, among other examples.

Some aspects described herein provide techniques and apparatuses for a high priority route selection descriptor selection timer. A PDU session may be established for an application associated with a UE. If the PDU session is associated with a lower RSD priority than the highest RSD priority for the application, the UE may initiate an RSD selection timer. After expiration of the RSD selection timer, the UE may try to establish another PDU session for the application with the highest RSD priority for the application. If another PDU session with the highest RSD priority is accepted, the UE may release the initial PDU session with the lower RSD priority and establish a new PDU session with the highest RSD priority.

Particular implementations of the subject matter described in this disclosure can be implemented to realize one or more of the following potential advantages. The RSD selection timer may enable the UE to attempt to obtain a PDU session with a highest RSD priority for an application associated with the UE even after a PDU session was established with a lower RSD priority. This may increase the user experience of the application, may increase data rates and reliability for the application, may decrease latency of the application, may increase quality of service (QoS) for the application, or may decrease power consumption, among other examples. Moreover, the duration of the RSD selection timer may be shorter than a duration of a periodic re-evaluation timer, which enables the UE to attempt to obtain a PDU session with a highest RSD priority for the application more quickly than if the UE solely relies on the periodic re-evaluation timer.

<FIG> is a block diagram illustrating an example of a wireless network <NUM>. A BS is an entity that communicates with UEs and also may be referred to as a base station, a NR BS, a Node B, a gNB, a <NUM> node B (NB), an access point, a transmit receive point (TRP), or the like. In 3GPP, the term "cell" can refer to a coverage area of a BS, a BS subsystem serving this coverage area, or a combination thereof, depending on the context in which the term is used.

A BS may provide communication coverage for a macro cell, a pico cell, a femto cell, another type of cell, or a combination thereof. A macro cell may cover a relatively large geographic area (for example, several kilometers in radius) and may allow unrestricted access by UEs with service subscription. A femto cell may cover a relatively small geographic area (for example, a home) and may allow restricted access by UEs having association with the femto cell (for example, UEs in a closed subscriber group (CSG)). A BS may support one or multiple (for example, three) cells.

In some examples, the BSs may be interconnected to one another as well as to one or more other BSs or network nodes (not shown) in the wireless network <NUM> through various types of backhaul interfaces, such as a direct physical connection, a virtual network, or a combination thereof using any suitable transport network.

Wireless network <NUM> also may include relay stations. A relay station is an entity that can receive a transmission of data from an upstream station (for example, a BS or a UE) and send a transmission of the data to a downstream station (for example, a UE or a BS). A relay station also may be a UE that can relay transmissions for other UEs. A relay BS also may be referred to as a relay station, a relay base station, a relay, etc..

Wireless network <NUM> may be a heterogeneous network that includes BSs of different types, for example, macro BSs, pico BSs, femto BSs, relay BSs, etc. These different types of BSs may have different transmit power levels, different coverage areas, and different impacts on interference in wireless network <NUM>. For example, macro BSs may have a high transmit power level (for example, <NUM> to <NUM> Watts) whereas pico BSs, femto BSs, and relay BSs may have lower transmit power levels (for example, <NUM> to <NUM> Watts).

The BSs also may communicate with one another, for example, directly or indirectly via a wireless or wireline backhaul.

UEs <NUM> (for example, 120a, 120b, 120c) may be dispersed throughout wireless network <NUM>, and each UE may be stationary or mobile. A UE also may be referred to as an access terminal, a terminal, a mobile station, a subscriber unit, a station, etc. A UE may be a cellular phone (for example, a smart phone), a personal digital assistant (PDA), a wireless modem, a wireless communication device, a handheld device, a laptop computer, a cordless phone, a wireless local loop (WLL) station, a tablet, a camera, a gaming device, a netbook, a smartbook, an ultrabook, a medical device or equipment, biometric sensors/devices, wearable devices (smart watches, smart clothing, smart glasses, smart wrist bands, smart jewelry (for example, smart ring, smart bracelet)), an entertainment device (for example, a music or video device, or a satellite radio), a vehicular component or sensor, smart meters/sensors, industrial manufacturing equipment, a global positioning system device, or any other suitable device that is configured to communicate via a wireless or wired medium.

MTC and eMTC UEs include, for example, robots, drones, remote devices, sensors, meters, monitors, location tags, etc., that may communicate with a base station, another device (for example, remote device), or some other entity. A wireless node may provide, for example, connectivity for or to a network (for example, a wide area network such as Internet or a cellular network) via a wired or wireless communication link. Some UEs may be considered Internet-of-Things (IoT) devices or may be implemented as NB-IoT (narrowband internet of things) devices. UE <NUM> may be included inside a housing that houses components of UE <NUM>, such as processor components, memory components, similar components, or a combination thereof.

A RAT also may be referred to as a radio technology, an air interface, etc. A frequency also may be referred to as a carrier, a frequency channel, etc. Each frequency may support a single RAT in a given geographic area in order to avoid interference between wireless networks of different RATs.

In some examples, access to the air interface may be scheduled, where a scheduling entity (for example, a base station) allocates resources for communication among some or all devices and equipment within the scheduling entity's service area or cell.

That is, in some examples, a UE may function as a scheduling entity, scheduling resources for one or more subordinate entities (for example, one or more other UEs). A UE may function as a scheduling entity in a peer-to-peer (P2P) network, in a mesh network, or another type of network.

In some aspects, two or more UEs <NUM> (for example, shown as UE 120a and UE 120e) may communicate directly using one or more sidelink channels (for example, without using a base station <NUM> as an intermediary to communicate with one another). For example, the UEs <NUM> may communicate using P2P communications, device-to-device (D2D) communications, a vehicle-to-everything (V2X) protocol (which may include a vehicle-to-vehicle (V2V) protocol, a vehicle-to-infrastructure (V2I) protocol, or similar protocol), a mesh network, or similar networks, or combinations thereof. In this case, the UE <NUM> may perform scheduling operations, resource selection operations, as well as other operations described elsewhere herein as being performed by the base station <NUM>.

For example, devices of wireless network <NUM> may communicate using an operating band having a first frequency range (FR1), which may span from <NUM> to <NUM>, or may communicate using an operating band having a second frequency range (FR2), which may span from <NUM> to <NUM>. Thus, unless specifically stated otherwise, it should be understood that the term "sub-<NUM>" or the like, if used herein, may broadly represent frequencies less than <NUM>, frequencies within FR1, or mid-band frequencies (for example, greater than <NUM>). Similarly, unless specifically stated otherwise, it should be understood that the term "millimeter wave" or the like, if used herein, may broadly represent frequencies within the EHF band, frequencies within FR2, or mid-band frequencies (for example, less than <NUM>).

<FIG> is a block diagram illustrating an example <NUM> of a base station <NUM> in communication with a UE <NUM>. In some aspects, base station <NUM> and UE <NUM> may respectively be one of the base stations and one of the UEs in wireless network <NUM> of <FIG>.

At base station <NUM>, a transmit processor <NUM> may receive data from a data source <NUM> for one or more UEs, select one or more modulation and coding schemes (MCS) for each UE based at least in part on channel quality indicators (CQIs) received from the UE, process (for example, encode and modulate) the data for each UE based at least in part on the MCS(s) selected for the UE, and provide data symbols for all UEs. The transmit processor <NUM> also may process system information (for example, for semi-static resource partitioning information (SRPI), etc.) and control information (for example, CQI requests, grants, upper layer signaling, etc.) and provide overhead symbols and control symbols. The transmit processor <NUM> also may generate reference symbols for reference signals (for example, the cell-specific reference signal (CRS)) and synchronization signals (for example, the primary synchronization signal (PSS) and secondary synchronization signal (SSS)). A transmit (TX) multiple-input multiple-output (MIMO) processor <NUM> may perform spatial processing (for example, precoding) on the data symbols, the control symbols, the overhead symbols, or the reference symbols, if applicable, and may provide T output symbol streams to T modulators (MODs) 232a through 232t. Each modulator <NUM> may process a respective output symbol stream (for example, for OFDM, etc.) to obtain an output sample stream. Each modulator <NUM> may further process (for example, convert to analog, amplify, filter, and upconvert) the output sample stream to obtain a downlink signal.

At UE <NUM>, antennas 252a through 252r may receive the downlink signals from base station <NUM> or other base stations and may provide received signals to demodulators (DEMODs) 254a through 254r, respectively. Each demodulator <NUM> may condition (for example, filter, amplify, downconvert, and digitize) a received signal to obtain input samples. Each demodulator <NUM> may further process the input samples (for example, for OFDM, etc.) to obtain received symbols. A receive processor <NUM> may process (for example, demodulate and decode) the detected symbols, provide decoded data for UE <NUM> to a data sink <NUM>, and provide decoded control information and system information to a controller or processor (controller/processor) <NUM>. A channel processor may determine reference signal received power (RSRP), received signal strength indicator (RSSI), reference signal received quality (RSRQ), CQI, etc. In some aspects, one or more components of UE <NUM> may be included in a housing.

Antennas (such as antennas 234a through 234t and/or antennas 252a through 252r) may include, or may be included within, one or more antenna panels, antenna groups, sets of antenna elements, or antenna arrays, among other examples. An antenna panel, an antenna group, a set of antenna elements, or an antenna array may include one or more antenna elements. An antenna panel, an antenna group, a set of antenna elements, or an antenna array may include a set of coplanar antenna elements or a set of non-coplanar antenna elements. An antenna panel, an antenna group, a set of antenna elements, or an antenna array may include antenna elements within a single housing and/or antenna elements within multiple housings. An antenna panel, an antenna group, a set of antenna elements, or an antenna array may include one or more antenna elements coupled to one or more transmission and/or reception components, such as one or more components of <FIG>.

On the uplink, at UE <NUM>, a transmit processor <NUM> may receive and process data from a data source <NUM> and control information (for example, for reports including RSRP, RSSI, RSRQ, CQI, etc.) from controller/processor <NUM>. Transmit processor <NUM> also may generate reference symbols for one or more reference signals. The symbols from transmit processor <NUM> may be precoded by a TX MIMO processor <NUM> if applicable, further processed by modulators 254a through 254r (for example, for DFT-s-OFDM or CP-OFDM), and transmitted to base station <NUM>. In some aspects, a modulator and a demodulator (such as MOD/DEMOD <NUM>) of the UE <NUM> may be included in a modem of the UE <NUM>. The transceiver may include any combination of antenna(s) <NUM>, modulators or demodulators <NUM>, MIMO detector <NUM>, receive processor <NUM>, transmit processor <NUM>, or TX MIMO processor <NUM>. The transceiver may be used by a processor (such as the controller/processor <NUM>) and memory <NUM> to perform aspects of any of the methods described herein (for example, as described with reference to <FIG>).

Receive processor <NUM> may provide the decoded data to a data sink <NUM> and the decoded control information to a controller or processor (i.e., controller/processor) <NUM>. The base station <NUM> may include communication unit <NUM> and communicate to network controller <NUM> via communication unit <NUM>. In some aspects, a modulator and a demodulator (such a MOD/DEMOD <NUM>) of the base station <NUM> may be included in a modem of the base station <NUM>. The transceiver may include any combination of antenna(s) <NUM>, modulators or demodulators <NUM>, MIMO detector <NUM>, receive processor <NUM>, transmit processor <NUM>, or TX MIMO processor <NUM>. The transceiver may be used by a processor (such as controller/processor <NUM>) and memory <NUM> to perform aspects of any of the methods described herein (for example, as described with reference to <FIG>). The network controller <NUM> may include communication unit <NUM>, a controller or processor (i.e., controller/processor) <NUM>, and memory <NUM>.

In some implementations, controller/processor <NUM> may be a component of a processing system. A processing system may generally refer to a system or series of machines or components that receives inputs and processes the inputs to produce a set of outputs (which may be passed to other systems or components of, for example, the UE <NUM>). For example, a processing system of the UE <NUM> may refer to a system including the various other components or subcomponents of the UE <NUM>.

The processing system of the UE <NUM> may interface with other components of the UE <NUM>, and may process information received from other components (such as inputs or signals), output information to other components, etc. For example, a chip or modem of the UE <NUM> may include a processing system, a first interface to receive or obtain information, and a second interface to output, transmit or provide information. In some cases, the first interface may refer to an interface between the processing system of the chip or modem and a receiver, such that the UE <NUM> may receive information or signal inputs, and the information may be passed to the processing system. In some cases, the second interface may refer to an interface between the processing system of the chip or modem and a transmitter, such that the UE <NUM> may transmit information output from the chip or modem. A person having ordinary skill in the art will readily recognize that the second interface also may obtain or receive information or signal inputs, and the first interface also may output, transmit or provide information.

In some implementations, controller/processor <NUM> may be a component of a processing system. A processing system may generally refer to a system or series of machines or components that receives inputs and processes the inputs to produce a set of outputs (which may be passed to other systems or components of, for example, the BS <NUM>). For example, a processing system of the BS <NUM> may refer to a system including the various other components or subcomponents of the BS <NUM>.

The processing system of the BS <NUM> may interface with other components of the BS <NUM>, and may process information received from other components (such as inputs or signals), output information to other components, etc. For example, a chip or modem of the BS <NUM> may include a processing system, a first interface to receive or obtain information, and a second interface to output, transmit or provide information. In some cases, the first interface may refer to an interface between the processing system of the chip or modem and a receiver, such that the BS <NUM> may receive information or signal inputs, and the information may be passed to the processing system. In some cases, the second interface may refer to an interface between the processing system of the chip or modem and a transmitter, such that the BS <NUM> may transmit information output from the chip or modem. A person having ordinary skill in the art will readily recognize that the second interface also may obtain or receive information or signal inputs, and the first interface also may output, transmit or provide information.

The controller/processor <NUM> of base station <NUM>, the controller/processor <NUM> of UE <NUM>, or any other component(s) of <FIG> may perform one or more techniques associated with a high priority route selection descriptor selection timer, as described in more detail elsewhere herein. For example, the controller/processor <NUM> of base station <NUM>, the controller/processor <NUM> of UE <NUM>, or any other component(s) (or combinations of components) of <FIG> may perform or direct operations of, for example, process <NUM> of <FIG> or other processes as described herein. The memories <NUM> and <NUM> may store data and program codes for base station <NUM> and UE <NUM>, respectively. A scheduler <NUM> may schedule UEs for data transmission on the downlink, the uplink, or a combination thereof.

The stored program codes, when executed by the controller/processor <NUM> or other processors and modules at UE <NUM>, may cause the UE <NUM> to perform operations described with respect to process <NUM> of <FIG> or other processes as described herein. A scheduler <NUM> may schedule UEs for data transmission on the downlink, the uplink, or a combination thereof.

In some aspects, UE <NUM> may include means for means for transmitting a PDU session establishment request message to establish a first PDU session for an application associated with the UE, means for receiving a PDU session establishment accept message for the first PDU session based on the PDU session establishment request message, means for initiating a RSD selection timer based on a first RSD priority associated with the first PDU session establishment request message being lower than a second RSD priority for the application, means for transmitting, after expiration of at least one of the RSD selection timer or a periodic re-evaluation timer, a second PDU session establishment request message to establish a second PDU session for the application, where the second PDU session establishment request message is associated with the second RSD priority, or the like, or combinations thereof. In some aspects, such means may include one or more components of UE <NUM> described in connection with <FIG>.

While blocks in <FIG> are illustrated as distinct components, the functions described herein with respect to the blocks may be implemented in a single hardware, software, or combination component or in various combinations of components. For example, the functions described with respect to the transmit processor <NUM>, the receive processor <NUM>, the TX MIMO processor <NUM>, or another processor may be performed by or under the control of controller/processor <NUM>.

<FIG> is a diagram illustrating an example <NUM> of a high priority RSD selection timer. As shown in <FIG>, example <NUM> includes communication between a UE (a UE <NUM>) and a plurality of network components (network controllers <NUM>) such as an AMF, and UPF1-UPF3. The UE and the network components may communicate via a base station (base station <NUM>). The UE and the base station may be included in a wireless network such as wireless network <NUM> described herein.

As shown in <FIG>, a UE may transmit multiple PDU session establishment requests to a network controller implementing an AMF function in a core network, such as a <NUM> core network. The PDU session establishment requests may be associated with an application of the UE. If the PDU session establishment request associated with the highest RSD priority for the application is rejected, the UE may accept a PDU session having a lower RSD priority and may initiate an RSD selection timer. After expiration of at least one of the RSD selection timer or a periodic re-evaluation timer, the UE may transmit another PDU session establishment request to attempt to establish another PDU session having the highest RSD priority for the application. If the PDU session establishment request is rejected, the UE may restart or reinitiate the RSD selection timer and may continue to transmit PDU session establishment requests for the highest RSD priority accordingly. If a PDU session establishment request for the highest RSD priority is accepted, the UE may establish the PDU session and release the PDU session having the lower RSD priority.

The UE may be communicatively connected and registered with a RAN of the wireless network. In some aspects, the UE may perform a random access channel (RACH) procedure to register with the RAN, for example, via a base station of the RAN. The RAN may include a <NUM> NG-RAN or another type of RAN. The RAN may include a distributed or disaggregated RAN (D-RAN) configuration, an open RAN (O-RAN) configuration, or another type of RAN configuration.

The RAN may include a <NUM> access node, which includes an access node controller (ANC). The access node controller may be a centralized unit (CU) of a distributed or disaggregated RAN. In some aspects, a backhaul interface to a <NUM> core network may terminate at the access node controller. The <NUM> core network may include a <NUM> control plane component (the AMF component or the network controller implementing the AMF function) and a plurality of <NUM> user plane components (the UPF components or the network controllers implementing the UPF components). The backhaul interface for one or both of the <NUM> control plane and the <NUM> user plane may terminate at the access node controller. Additionally, or alternatively, a backhaul interface to one or more neighbor access nodes (e.g., another <NUM> access node and/or an LTE access node) may terminate at the access node controller.

The access node controller may include and may communicate with one or more transmit receive points (TRPs - also referred to as distributed or disaggregated units (DUs)) via an F1 Control (F1-C) interface, an F1 User (F1-U) interface, or another type of interface. In some aspects, a DU may correspond to a base station described herein. For example, different DUs may be included in different base stations. Additionally, or alternatively, multiple DUs may be included in a single base station. In some aspects, a base station may include a CU or ANC, may one or more DUs, or a combination thereof.

A DU may be connected to a single access node controller or to multiple access node controllers. In some aspects, a dynamic configuration of split logical functions may be present within the architecture of a distributed or disaggregated RAN. For example, a packet data convergence protocol (PDCP) layer, a radio link control (RLC) layer, and/or a medium access control (MAC) layer may be configured to terminate at the access node controller or at a DU.

At <NUM>, an application executing, running, or operating on the UE may generate a request for a network connection such as a PDU session. The application may be a software application client installed on the UE or a cloud-based application accessed by the UE, such as a video application, a messaging application, a productivity application, a gaming application, a map or positioning application, or another type of application. Additionally, the application may be a software application or industrial application installed on an IoT device or a cloud-based application accessed by the IoT device or IIoT device, such as an automation application, an AR or VR application, an infrastructure application, a robotics-related application, a maintenance application, a security application, or another type of application.

At <NUM>, the modem may obtain the request for the network connection from the application and may generate a PDU session establishment request. In some aspects, the modem of the UE generates the PDU session establishment request based on the request for the network connection. The UE may use the PDU session establishment request to request a connection to a network slicing instance of a core network (such as a <NUM> core network) by transmitting (or the modem of the UE may output for transmission) a PDU session establishment request to the core network (for example, the AMF) via the base station of the wireless network. During a PDU session setup procedure, the UE may use an RSD (and the RSD components associated with the RSD) to set up a PDU session and to connect to a network slicing instance of the core network.

In some aspects, the UE may attempt to request the best RSD for the network connection for the application. This may be referred to as the highest priority RSD for the application. Which RSD is the "best RSD" for the application may depend on the type of application, the type of traffic that is to be transferred by the application and the network, quality of service (QoS) parameters for the application, a combination thereof, or other parameters. As an example, the highest priority RSD for an application that prioritizes low latency (such as a gaming application or a video calling application) may be an RSD that provides the lowest latency for the UE. As another example, the highest priority RSD for an application that prioritizes throughput (such as a video streaming application or a large file downloading application) may be an RSD that provides the highest throughput for the UE.

At <NUM>, the AMF provides a UPF selection request to the UPF associated with the RSD indicated in the PDU session establishment request (UPF1 and RSD#<NUM>, respectively, in this example). The UPF receives the UPF selection request and determines whether the UPF can support the network connection with the UE for the application on the network slice associated with the UPF. Examples of parameters or criteria that the UPF may base the determination on include the quantity or number of connections that the UPF is providing or servicing (for example, at the time that the UPF receives the UPF selection request), the available bandwidth at the UPF (for example, for the requested network slice associated with the RSD, the DNN associated with the RSD, or a combination thereof), whether the UPF supports the SSC associated with the RSD, whether the UPF can support the throughput parameters for the application of the UE (which may be indicated in the UPF selection request), and whether the UPF can support the latency parameters for the application of the UE (which may be indicated in the UPF selection request), among other examples. However, the UPF may consider other parameters and criteria in addition to, or alternatively to, the parameters and criteria described herein.

At <NUM>, the AMF transmits a PDU session establishment rejection communication to the UE. The UE may receive (or the modem of the UE may obtain) the PDU session establishment rejection communication from the AMF (for example, via a base station in the wireless network). The PDU session establishment rejection communication may be based on the AMF receiving an indication that the UPF has rejected the specific RSD requested by the UE. The PDU session establishment rejection communication may indicate the PDU session establishment request is rejected and may provide a reason for the rejection. For example, the PDU session establishment rejection communication may indicate that the PDU session establishment request is rejected for insufficient resources for the specific network slice associated with the requested RSD, for an unsupported SSC mode, or for insufficient resources for the specific network slice associated with the requested RSD and a DNN, among other examples.

At <NUM>, the UE (or the modem of the UE) may generate a second PDU session establishment request. In some aspects, the modem of the UE generates the second PDU session establishment request based on receiving the PDU session establishment rejection communication from the AMF. The UE may transmit (or the modem of the UE may output for transmission) the second PDU session establishment request to request a connection to a network slicing instance of the core network associated with a second RSD (RSD#<NUM>). This gives the UE the opportunity to still attempt to establish the network connection for the application of the UE with a lower priority RSD. The second RSD may be a second highest priority for the application.

At <NUM>, the AMF provides a UPF selection request to the UPF associated with the RSD indicated in the second PDU session establishment request (UPF2 and RSD#<NUM>, respectively, in this example). The UPF receives the UPF selection message and determines whether the UPF can support the network connection with the UE for the application on the network slice associated with the UPF. Examples of parameters or criteria that the UPF may base the determination on include the quantity or number of connections that the UPF is providing or servicing (for example, at the time that the UPF receives the UPF selection request), the available bandwidth at the UPF (for example, for the requested network slice associated with the RSD, the DNN associated with the RSD, or a combination thereof), whether the UPF supports the SSC associated with the RSD, whether the UPF can support the throughput parameters for the application of the UE (which may be indicated in the UPF selection request), and whether the UPF can support the latency parameters for the application of the UE (which may be indicated in the UPF selection request), among other examples. However, the UPF may consider other parameters and criteria in addition to, or alternatively to, the parameters and criteria described herein.

At <NUM>, the AMF transmits a PDU session establishment rejection communication to the UE. The UE may receive (or the modem of the UE may obtain) the PDU session establishment rejection communication from the AMF (for example, via a base station in the wireless network). The PDU session establishment rejection communication may be based on the AMF receiving an indication that the UPF has rejected the specific RSD requested by the UE (RSD#<NUM>). The PDU session establishment rejection communication may indicate the second PDU session establishment request is rejected and may provide a reason for the rejection. For example, the PDU session establishment rejection communication may indicate that the second PDU session establishment request is rejected for insufficient resources for the specific network slice associated with the requested RSD (RSD#<NUM>), for an unsupported SSC mode, or for insufficient resources for the specific network slice associated with the requested RSD and a DNN, among other examples.

At <NUM>, the UE (or the modem of the UE) may generate a third PDU session establishment request. In some aspects, the modem of the UE generates the third PDU session establishment request based on receiving the PDU session establishment rejection communication from the AMF for the second PDU session establishment request. The UE may transmit (or the modem of the UE may output for transmission) the third PDU session establishment request to request a connection to a network slicing instance of the core network associated with a third RSD (RSD#<NUM>). This gives the UE the opportunity to still attempt to establish the network connection for the application of the UE with a lower priority RSD. The second RSD may be a third highest priority for the application.

At <NUM>, the AMF provides a UPF selection request to the UPF associated with the RSD indicated in the third PDU session establishment request (UPF3 and RSD#<NUM>, respectively, in this example). The UPF receives the UPF selection message and determines whether the UPF can support the network connection with the UE for the application on the network slice associated with the UPF. Examples of parameters or criteria that the UPF may base the determination on include the quantity or number of connections that the UPF is providing or servicing (for example, at the time that the UPF receives the UPF selection request), the available bandwidth at the UPF (for example, for the requested network slice associated with the RSD, the DNN associated with the RSD, or a combination thereof), whether the UPF supports the SSC associated with the RSD, whether the UPF can support the throughput parameters for the application of the UE (which may be indicated in the UPF selection request), and whether the UPF can support the latency parameters for the application of the UE (which may be indicated in the UPF selection request), among other examples. However, the UPF may consider other parameters and criteria in addition to, or alternatively to, the parameters and criteria described herein.

At <NUM>, the AMF transmits a PDU session establishment acceptance communication to the UE. The UE may receive (or the modem of the UE may obtain) the PDU session establishment acceptance communication from the AMF (for example, via a base station in the wireless network). The PDU session establishment acceptance communication indicates that the third PDU session establishment request with the third RSD (RSD#<NUM>) is accepted. The UE may establish the network connection (the PDU session) for the application using the network slice associated with the third RSD (RSD#<NUM>).

It is noted that the quantity of the proceeding sequence of PDU session establishment requests is an example and other quantities are within the scope of the present disclosure. The UE may continue to try RSDs to establish the network connection with the core network in descending priority order of the RSDs until a PDU session establishment request is accepted by the core network. The priority order of RSDs for a particular application may be indicated in a UE route selection policy for the application, which may be stored by the UE.

At <NUM>, the UE (or the modem of the UE) initiates or starts an RSD selection timer (RSDSelectionTimer). In some aspects, the UE initiates the RSD selection timer based on the RSD, that was used to establish the network connection (the PDU session) with the core network (UPF3), being a lower priority than the highest priority RSD for the application. In other words, the UE may initiate the RSD selection timer based on determining that the priority of the RSD, that was used to establish the network connection (the PDU session) with the core network (UPF3), is lower than the highest priority RSD for the application. The network connection (or PDU session) with the lower RSD priority may result in poor user experience for the application, reduced data rates and reliability for the application, or increased latency for the application, among other examples.

The UE may further initiate the RSD selection timer based on signaling from the network. For example, the AMF (or a base station) may transmit a communication that configures the RSD selection timer for the UE (in other words, that indicates that the UE is to initiate the RSD selection timer if the highest priority RSD for an application is not obtained).

The RSD selection timer includes a timer at the expiration of which permits the UE to attempt to reselect a higher priority RSD for the application associated with the UE. The RSD selection timer may enable the UE to attempt to obtain a PDU session with a highest RSD priority for the application associated with the UE even after the PDU session was established with the lower priority RSD. This may increase the user experience of the application, may increase data rates and reliability for the application, may decrease latency of the application, may increase QoS for the application, or may decrease power consumption, among other examples. The UE may also initiate a periodic re-evaluation timer. The duration of the RSD selection timer may be shorter than a duration of the periodic re-evaluation timer, which enables the UE to attempt to obtain a PDU session with a highest RSD priority for the application more quickly than if the UE solely relies on the periodic re-evaluation timer. In some aspects, the duration of the RSD selection timer is greater than two minutes and less than the time duration of the periodic re-evaluation timer. In some aspects, the duration of the RSD selection timer is another duration. In some aspects, the duration of the periodic re-evaluation timer is five minutes, ten minutes, or is configured based on UE implementation.

In some aspects, the duration of the RSD selection timer is signaled to the UE by a component of the wireless network such as a base station. The AMF may provide an indication of the duration of the RSD selection timer to the base station, which transmits the indication of the duration to the UE. The base station may transmit the indication of the duration of the RSD selection timer at the time that the UE connects to the wireless network, at the time that the network connection (the PDU session) for the application is established, or at another time.

In some aspects, the duration of the RSD selection timer is based on input to the UE. For example, the UE may provide a user interface (UI) that is accessed by a user of the UE via a display of the UE. The user may provide input to the UE via the UI. The input may indicate a selection of the duration for the RSD selection timer. The user may select an initial duration and may change the duration of the RSD selection time via the UI. In some aspects, the duration of the RSD selection timer is based on a configuration of the UE, which may be installed on the UE at (or prior to) the time that the UE is provisioned and deployed into the wireless network.

At <NUM>, the UE may determine whether the RSD selection timer (RSDSelectionTimer) has expired. At <NUM>, the UE may determine whether the periodic re-evaluation timer has expired. If the UE determines that neither of the RSD selection timer or the periodic re-evaluation timer have expired, the UE may continue to wait or monitor the RSD selection timer and the periodic re-evaluation timer have for expiration.

The UE may determine whether the RSD selection timer has expired based on monitoring a count-down (or a count-up) of the RSD selection timer. For example, the UE may initiate the RSD selection timer to a duration of three minutes, and may count down the three minutes until the RSD selection timer reaches zero. The UE may determine that the RSD selection timer has expired based on determining that the RSD selection timer has reached zero. As another example, the UE may initiate the RSD selection timer to zero, and may count up from zero until the RSD selection timer reaches a threshold timer duration (for example, four minutes). The UE may determine that the RSD selection timer has expired based on determining that the RSD selection timer has reached four minutes.

Similarly, the UE may determine whether the periodic re-selection timer has expired based on monitoring a count-down (or a count-up) of the periodic re-selection timer. For example, the UE may initiate the periodic re-selection timer to a duration of fifteen minutes, and may count down the fifteen minutes until the periodic re-selection timer reaches zero. The UE may determine that the periodic re-selection timer has expired based on determining that the periodic re-selection timer has reached zero. As another example, the UE may initiate the periodic re-selection timer to zero, and may count up until the periodic re-selection timer reaches a threshold timer duration (for example, eight minutes). The UE may determine that the periodic re-selection timer has expired based on determining that the periodic re-selection timer has reached eight minutes.

At <NUM>, after expiration of at least one of the RSD selection timer or the periodic re-evaluation timer, the UE may transmit (or the modem of the UE may output for transmission) a PDU session establishment request for the application. The PDU session establishment request is associated with the highest priority RSD associated with the application. This gives the UE another opportunity to try and obtain the highest priority RSD after expiration of at least one of the RSD selection timer or the periodic re-evaluation timer.

The UE may transmit the PDU session establishment request after expiration of at least one of the RSD selection timer or the periodic re-evaluation timer based on the network configuring the UE to retry the highest priority RSD in aspects where the highest priority RSD was previously rejected for a PDU session of an application of the UE. The UE may transmit the PDU session establishment request to establish a second network connection (a PDU session) for the application. The UE may maintain the established network connection (the established PDU session) for the application while attempting to establish the second network connection for the application so as to maintain service for the application and to not interrupt the user experience of the application.

At <NUM>, the AMF provides a UPF selection request to the UPF associated with the RSD indicated in the PDU session establishment request (UPF1 and RSD#<NUM>, respectively, in this example). The UPF receives the UPF selection message and determines whether the UPF can support the network connection with the UE for the application on the network slice associated with the UPF. Examples of parameters or criteria that the UPF may base the determination on include the quantity or number of connections that the UPF is providing or servicing (for example, at the time that the UPF receives the UPF selection request), the available bandwidth at the UPF (for example, for the requested network slice associated with the RSD, the DNN associated with the RSD, or a combination thereof), whether the UPF supports the SSC associated with the RSD, whether the UPF can support the throughput parameters for the application of the UE (which may be indicated in the UPF selection request), and whether the UPF can support the latency parameters for the application of the UE (which may be indicated in the UPF selection request), among other examples. However, the UPF may consider other parameters and criteria in addition to, or alternatively to, the parameters and criteria described herein.

At <NUM>, the AMF transmits a PDU session establishment acceptance communication to the UE. The PDU session establishment acceptance communication indicates that the PDU session establishment request with the highest priority RSD (RSD#<NUM>) is accepted. The UE may establish the network connection (the PDU session) for the application using the network slice associated with the highest priority RSD (RSD#<NUM>). Once the network connection (PDU session) is established, the UE may release the network connection (the PDU session) with the lower priority RSD for the application.

If instead the PDU session establishment request for the highest priority RSD is again rejected by the core network, the UE may again initiate (reinitiate) the RSD selection timer and the periodic re-evaluation timer. In these aspects, the UE may perform the operations described in connection with <NUM>-<NUM> to subsequently attempt to obtain the highest priority RSD for the application.

<FIG> is a diagram illustrating an example process <NUM> performed, for example, by a UE. The process <NUM> is an example where the UE (such as UE <NUM>, among other examples) performs operations associated with a high priority route selection descriptor selection timer.

As shown in <FIG>, in some aspects, the process <NUM> may include transmitting a first PDU session establishment request message to establish a first PDU session for an application associated with the UE (block <NUM>). For example, the UE (such as, using receive processor <NUM>, transmit processor <NUM>, controller/processor <NUM>, memory <NUM>, or another component) may transmit a first PDU session establishment request message to establish a first PDU session for an application associated with the UE, as described herein.

As shown in <FIG>, in some aspects, the process <NUM> may include receiving a PDU session establishment accept message for the first PDU session based on the PDU session establishment request message (block <NUM>). For example, the UE (such as, using receive processor <NUM>, transmit processor <NUM>, controller/processor <NUM>, memory <NUM>, or another component) may receive a PDU session establishment accept message for the first PDU session based on the PDU session establishment request message, as described herein.

As shown in <FIG>, in some aspects, the process <NUM> may include initiating an RSD selection timer based on a first RSD priority associated with the first PDU session establishment request message being lower than a second RSD priority for the application (block <NUM>). For example, the UE (such as, using receive processor <NUM>, transmit processor <NUM>, controller/processor <NUM>, memory <NUM>, or another component) may initiate an RSD selection timer based on a first RSD priority associated with the first PDU session establishment request message being lower than a second RSD priority for the application, as described herein.

As shown in <FIG>, in some aspects, the process <NUM> may include transmitting, after expiration of at least one of the RSD selection timer or a periodic re-evaluation timer, a second PDU session establishment request message to establish a second PDU session for the application, where the second PDU session establishment request message is associated with the second RSD priority (block <NUM>). For example, the UE (for example, using receive processor <NUM>, transmit processor <NUM>, controller/processor <NUM>, memory <NUM>, or another component) may transmit, after expiration of at least one of the RSD selection timer or a periodic re-evaluation timer, a second PDU session establishment request message to establish a second PDU session for the application, as described herein. In some aspects, the second PDU session establishment request message is associated with the second RSD priority.

The process <NUM> may include additional aspects, such as any single aspect or any combination of aspects described below or in connection with one or more other processes described elsewhere herein.

In a first aspect, the second RSD priority for the application is a highest RSD priority indicated in a UE route selection policy for the application. In a second additional aspect, alone or in combination with the first aspect, transmitting the second PDU session establishment request message to establish the second PDU session for the application includes transmitting the second PDU session establishment request message to establish the second PDU session while being connected to the first PDU session. In a third additional aspect, alone or in combination with one or more of the first and second aspects, the process <NUM> includes receiving a PDU session establishment accept message for the second PDU session based on the second PDU session establishment request message; and releasing the first PDU session based on receiving the PDU session establishment accept message for the second PDU session.

In a fourth additional aspect, alone or in combination with one or more of the first through third aspects, the process <NUM> includes receiving a PDU session establishment reject message for the second PDU session based on the PDU session establishment request message; transmitting a third PDU session establishment request message to establish the second PDU session for the application; receiving a PDU session establishment accept message for the second PDU session based on the third PDU session establishment request message; and reinitiating the RSD selection timer based on a third RSD priority associated with the third PDU session establishment request message being lower than the second RSD priority for the application. In a fifth additional aspect, alone or in combination with one or more of the first through fourth aspects, a time duration of the RSD selection timer is greater than two minutes and less than a time duration of the periodic re-evaluation timer.

In a sixth aspect, alone or in combination with one or more of the first through fifth aspects, transmitting the second PDU session establishment request includes transmitting the second PDU session establishment request based on expiration of at least one of the RSD selection timer or a periodic re-evaluation timer. In some implementations, transmitting the second PDU session establishment request includes automatically transmitting the second PDU session establishment request based on expiration of at least one of the RSD selection timer or a periodic re-evaluation timer. In a seventh aspect, alone or in combination with one or more of the first through sixth aspects, transmitting the second PDU session establishment request includes transmitting the second PDU session establishment request based on receiving, via a user interface (UI) of the UE, input from a user indicating approval to transmit the second PDU session establishment request.

In an eighth aspect, alone or in combination with one or more of the first through seventh aspects, process <NUM> includes displaying, after expiration of at least one of the RSD selection timer or a periodic re-evaluation timer, a request for approval to transmit the second PDU session establishment request, the request being displayed via the UI of the UE. In a ninth aspect, alone or in combination with one or more of the first through eighth aspects, receiving the input from the user indicating approval includes receiving the input from the user indicating approval based on displaying the request for approval.

In a tenth aspect, alone or in combination with one or more of the first through ninth aspects, a duration of the RSD selection timer duration is signaled to the UE by a network component. In an eleventh aspect, alone or in combination with one or more of the first through tenth aspects, a duration of the RSD selection timer is based on user input received via the UI or based on a configuration of the UE.

Although <FIG> shows example blocks of the process <NUM>, in some aspects, the process <NUM> may include additional blocks, fewer blocks, different blocks, or differently arranged blocks than those depicted in <FIG>. Additionally, or alternatively, two or more of the blocks of the process <NUM> may be performed in parallel.

<FIG> is a diagram illustrating an example <NUM> of a high priority RSD selection timer. As shown in <FIG>, a UE may transmit multiple PDU session establishment requests to a network controller implementing an AMF function in a core network, such as a <NUM> core network. The PDU session establishment requests may be associated with an application of the UE. If the PDU session establishment request associated with the highest RSD priority for the application is rejected, the UE may accept a PDU session having a lower RSD priority and may initiate an RSD selection timer.

After expiration of at least one of the RSD selection timer or a periodic re-evaluation timer, the UE may display a notification to the user of the UE on the display screen of the UE. The notification may include a request for input such as a request to approve an RSD reselection attempt to establish another PDU session having the highest RSD priority for the application. The user may provide input to the UE indicating acceptance or approval of the RSD reselection attempt, or may provide input to reject the RSD reselection attempt. The UE may receive input indicating approval or acceptance, and accordingly may transmit another PDU session establishment request to attempt to establish another PDU session having the highest RSD priority for the application. If the PDU session establishment request is rejected, the UE may restart the RSD selection timer and may continue to transmit PDU session establishment requests for the highest RSD priority accordingly. If a PDU session establishment request for the highest RSD priority is accepted, the UE may establish the PDU session and release the PDU session having the lower RSD priority.

In this way, the switch to a higher priority RSD may be decided by the user and selected by the user from the user interface (UI) of the UE. The request for approval to attempt or initiate the RSD reselection is based on a recommendation received from the modem of the UE. This causes the notification to be opened on the UI informing the user that a higher priority RSD service for the application may be available. The user may decide to accept or reject the reselection based on throughput and latency of the connected RSD priority. If the user accepts, the modem of the UE sends a new PDU session establishment request with the associated high priority RSD. If the network accepts the request, the high priority RSD is associated with the application in a new PDU session. The previous PDU session with the lower priority RSD may be released.

As shown in <FIG>, operations may be performed associated with <NUM>-<NUM>. The operations performed in connection with <NUM>-<NUM> are similar to the operations described in connection with <NUM>-<NUM> of <FIG>. The UE may be communicatively connected and registered with a RAN of the wireless network. In some aspects, the UE may perform a RACH procedure to register with the RAN, for example, via a base station of the RAN. The RAN may include a <NUM> NG-RAN or another type of RAN. The RAN may include a D-RAN configuration, an O-RAN configuration, or another type of RAN configuration.

At <NUM>, the UE may display, after expiration of at least one of the RSD selection timer or a periodic re-evaluation timer, a request for user input (for example, approval from the user) to transmit another PDU session establishment request to retry establishing a network connection (a PDU session) with the highest priority RSD for the application. The UE may display the request (or may cause the request to be displayed) via the UI of the UE. The request may indicate that a higher priority RSD (or a higher priority service for the application) may be available, and may request the user to approve or accept (or retry) an attempt to obtain the higher priority service for the application.

At <NUM>, the UE may receive input from the user indicating approval to retry establishing a network connection (a PDU session) with the highest priority RSD for the application. In some aspects, the UE receives the input from the user via the UI and based on displaying the request via the UI for approval. Additionally, or alternatively, the user may use the UI to provide input to set or modify a configuration for the UE associated with RSD reselection. The configuration may indicate that the UE is to retry establishing a network connection (a PDU session) with the highest priority RSD for applications where the highest priority RSD was previously rejected. In these aspects, the UE may retry establishing a network connection (a PDU session) with the highest priority RSD for the application based on the configuration.

At <NUM>, the UE may transmit (or the modem of the UE may output for transmission) a PDU session establishment request for the application. The PDU session establishment request is associated with the highest priority RSD associated with the application. This gives the UE another opportunity to try and obtain the highest priority RSD after expiration of at least one of the RSD selection timer or the periodic re-evaluation timer. The UE may transmit the PDU session establishment request based on the configuration or based on the input received from the user via the UI of the UE (for example, indicating approval for the retry attempt).

Modifications and variations may be made in light of this disclosure or may be acquired from practice of the aspects.

"Software" shall be construed broadly to mean instructions, instruction sets, code, code segments, program code, programs, subprograms, software modules, applications, software applications, software packages, routines, subroutines, objects, executables, threads of execution, procedures, or functions, among other examples, whether referred to as software, firmware, middleware, microcode, hardware description language, or otherwise. As used herein, a processor is implemented in hardware or a combination of hardware and software. It will be apparent that systems or methods described herein may be implemented in different forms of hardware or a combination of hardware and software. The actual specialized control hardware or software code used to implement these systems or methods is not limiting of the aspects. Thus, the operation and behavior of the systems or methods were described herein without reference to specific software code-it being understood that software and hardware can be designed to implement the systems or methods based, at least in part, on the description herein.

As used herein, satisfying a threshold may refer to a value being greater than the threshold, greater than or equal to the threshold, less than the threshold, less than or equal to the threshold, equal to the threshold, not equal to the threshold, or the like.

The various illustrative logics, logical blocks, modules, circuits and algorithm processes described in connection with the aspects disclosed herein may be implemented as electronic hardware, computer software, or combinations of both. The interchangeability of hardware and software has been described generally, in terms of functionality, and illustrated in the various illustrative components, blocks, modules, circuits and processes described herein.

The hardware and data processing apparatus used to implement the various illustrative logics, logical blocks, modules and circuits described in connection with the aspects disclosed herein may be implemented or performed with a general purpose single- or multi-chip processor, a digital signal processor (DSP), an application specific integrated circuit (ASIC), a field programmable gate array (FPGA) or other programmable logic device, discrete gate or transistor logic, discrete hardware components, or any combination thereof designed to perform the functions described herein. A general purpose processor may be a microprocessor, or any conventional processor, controller, microcontroller, or state machine. A processor also may be implemented as a combination of computing devices, for example, a combination of a DSP and a microprocessor, a plurality of microprocessors, one or more microprocessors in conjunction with a DSP core, or any other such configuration. In some aspects, particular processes and methods may be performed by circuitry that is specific to a given function.

Aspects of the subject matter described in this specification also can be implemented as one or more computer programs, i.e., one or more modules of computer program instructions, encoded on a computer storage media for execution by, or to control the operation of, data processing apparatus.

Combinations should also be included within the scope of computer-readable media.

Various modifications to the aspects described in this disclosure may be readily apparent to those skilled in the art, and the generic principles defined herein may be applied to other aspects without departing from the scope of this disclosure, as defined by the appended set of claims.

Certain features that are described in this specification in the context of separate aspects also can be implemented in combination in a single aspect. Conversely, various features that are described in the context of a single aspect also can be implemented in multiple aspects separately or in any suitable subcombination. Moreover, although features may be described herein as acting in certain combinations and even initially claimed as such, one or more features from a claimed combination can in some cases be excised from the combination, and the claimed combination may be directed to a subcombination or variation of a subcombination.

Claim 1:
A method of wireless communication performed by an apparatus of a user equipment, UE, comprising:
transmitting (<NUM>) a first protocol data unit, PDU, session establishment request message to establish a first PDU session for an application associated with the UE;
receiving (<NUM>) a PDU session establishment accept message for the first PDU session based on the PDU session establishment request message;
initiating (<NUM>) a route selection descriptor, RSD, selection timer based on a first RSD priority associated with the first PDU session establishment request message being lower than a second RSD priority for the application; and
transmitting (<NUM>), after expiration of at least one of the RSD selection timer or a periodic re-evaluation timer, a second PDU session establishment request message to establish a second PDU session for the application,
wherein the second PDU session establishment request message is associated with the second RSD priority.