WO2022041095A1

WO2022041095A1 - Techniques for re-ordering radio access network priorities

Info

Publication number: WO2022041095A1
Application number: PCT/CN2020/111997
Authority: WO
Inventors: Chaofeng HUI; Bing LENG; Guojing LIU
Original assignee: Qualcomm Incorporated
Priority date: 2020-08-28
Filing date: 2020-08-28
Publication date: 2022-03-03

Abstract

Methods, systems, and devices for wireless communications are described. A user equipment (UE) may establish a connection with a first radio access network (RAN) (e.g., a shared RAN), where the first RAN may be associated with a first operator and a second operator. The UE may transmit, to the first RAN, a request to setup an internet protocol multimedia subsystem (IMS) call, and receive a radio resource control (RRC) release message during an IMS call setup procedure. The RRC release message may indicate a set of RANs, where each RAN of the set of RANs is assigned a priority. The UE may re-assign one or more of the assigned priorities associated with one or more RANs and the UE may establish a connection with a second RAN based on the re-assigned one or more priorities. Upon establishing a connection with the second RAN, the UE may perform the IMS call.

Description

TECHNIQUES FOR RE-ORDERING RADIO ACCESS NETWORK PRIORITIES

FIELD OF TECHNOLOGY

The following relates to wireless communications, including techniques for re-ordering radio access network (RAN) priorities.

BACKGROUND

Wireless communications systems are widely deployed to provide various types of communication content such as voice, video, packet data, messaging, broadcast, and so on. These systems may be capable of supporting communication with multiple users by sharing the available system resources (e.g., time, frequency, and power) . Examples of such multiple-access systems include fourth generation (4G) systems such as Long Term Evolution (LTE) systems, LTE-Advanced (LTE-A) systems, or LTE-A Pro systems, and fifth generation (5G) systems which may be referred to as New Radio (NR) systems. These systems may employ technologies such as code division multiple access (CDMA) , time division multiple access (TDMA) , frequency division multiple access (FDMA) , orthogonal frequency division multiple access (OFDMA) , or discrete Fourier transform spread orthogonal frequency division multiplexing (DFT-S-OFDM) . A wireless multiple-access communications system may include one or more base stations or one or more network access nodes, each simultaneously supporting communication for multiple communication devices, which may be otherwise known as user equipment (UE) .

In some wireless communications systems, an operator may combine resources with one or more other operators to deploy a shared radio access network (RAN) , where the shared RAN may provide services (e.g., 5G services) to one or more UEs that may connect to the shared RAN. In some implementations, a shared RAN may be connected to an independent operator core network, or multiple operator core networks. In some cases, a UE may initiate a procedure to perform one or more communications, such as an internet protocol (IP) multimedia subsystem (IMS) call while connected to the shared RAN. Conventional techniques for the UE to perform the one or more communications (e.g., the IMs call) may be deficient.

SUMMARY

The described techniques relate to improved methods, systems, devices, and apparatuses that support techniques for re-ordering radio access network (RAN) priorities. Generally, the described techniques provide for a user equipment (UE) to reorder a list that includes multiple RANs (e.g., base stations) that are each assigned a priority. A UE may be connected to a first RAN (e.g., a shared RAN) and the UE may determine to perform a communication, such as an internet protocol (IP) multimedia subsystem (IMS) call. Upon this determination the UE may transmit an indication to the first RAN that the UE has determined to perform the communication. In response, the first RAN may transmit, to the UE, a radio resource control (RRC) release message that includes a list of multiple RANs (e.g., neighboring RANs, the first RAN) , where the list may indicate a priority assigned to each RAN in the list. In some cases, upon receiving the RRC release message, the UE may re-prioritize the RANs, so that the UE may perform the communications via a particular RAN, such as the RAN associated with the subscriber identify module (SIM) card the UE is configured with.

For example, the UE may establish a connection with a first RAN (e.g., the shared RAN) , where the first RAN may be associated with a first operator and a second operator. The UE may transmit, to the first RAN, a request to perform an IMS call as part of an IMS call setup procedure, and receive a RRC release message in response to the request and during the IMS call setup procedure. The RRC release message may indicate a set of RANs, where each RAN of the set of RANs is assigned a priority. In some cases, the RRC release message may indicate the set of RANs implicitly via a set of frequencies each associated with a RAN, where each frequency is assigned a priority. The UE may re-assign one or more of the assigned priorities associated with one or more RANs of the set of RANs, and the UE may establish a connection with a second RAN based on the re-assigned one or more priorities. Upon establishing a connection with the second RAN, the UE may perform the IMS call, or continue to perform an IMS call setup procedure, or both.

A method of wireless communications at a UE is described. The method may include establishing a connection with a first RAN, the first RAN associated with a first operator and a second operator, transmitting, to the first RAN, a request to setup an IMS call as part of an IMS call setup procedure, receiving a radio resource control release message during the IMS call setup procedure, the radio resource control release message indicating a set of frequencies each associated with a RAN, where each frequency of the set of frequencies is assigned a priority, re-assigning one or more of the assigned priorities associated with one or more frequencies of the set of frequencies, and establishing a connection with a second RAN based on the re-assigned one or more priorities.

An apparatus for wireless communications at a UE is described. The apparatus may include a processor, memory coupled with the processor, and instructions stored in the memory. The instructions may be executable by the processor to cause the apparatus to establish a connection with a first RAN, the first RAN associated with a first operator and a second operator, transmit, to the first RAN, a request to setup an IMS call as part of an IMS call setup procedure, receive a radio resource control release message during the IMS call setup procedure, the radio resource control release message indicating a set of frequencies each associated with a RAN, where each frequency of the set of frequencies is assigned a priority, re-assign one or more of the assigned priorities associated with one or more frequencies of the set of frequencies, and establish a connection with a second RAN based on the re-assigned one or more priorities.

Another apparatus for wireless communications at a UE is described. The apparatus may include means for establishing a connection with a first RAN, the first RAN associated with a first operator and a second operator, transmitting, to the first RAN, a request to setup an IMS call as part of an IMS call setup procedure, receiving a radio resource control release message during the IMS call setup procedure, the radio resource control release message indicating a set of frequencies each associated with a RAN, where each frequency of the set of frequencies is assigned a priority, re-assigning one or more of the assigned priorities associated with one or more frequencies of the set of frequencies, and establishing a connection with a second RAN based on the re-assigned one or more priorities.

A non-transitory computer-readable medium storing code for wireless communications at a UE is described. The code may include instructions executable by a processor to establish a connection with a first RAN, the first RAN associated with a first operator and a second operator, transmit, to the first RAN, a request to setup an IMS call as part of an IMS call setup procedure, receive a radio resource control release message during the IMS call setup procedure, the radio resource control release message indicating a set of frequencies each associated with a RAN, where each frequency of the set of frequencies is assigned a priority, re-assign one or more of the assigned priorities associated with one or more frequencies of the set of frequencies, and establish a connection with a second RAN based on the re-assigned one or more priorities.

Some examples of the method, apparatuses, and non-transitory computer-readable medium described herein may further include operations, features, means, or instructions for determining that the UE may be configured with a subscriber identity module card associated with the first operator, the first operator associated with the second RAN, the second operator associated with a third RAN.

In some examples of the method, apparatuses, and non-transitory computer-readable medium described herein, re-assigning the one or more of the assigned priorities further may include operations, features, means, or instructions for re-assigning the second RAN with a higher priority than the first RAN based on determining that the UE may be configured with a subscriber identity module card associated with the first operator.

In some examples of the method, apparatuses, and non-transitory computer-readable medium described herein, re-assigning the one or more of the assigned priorities further may include operations, features, means, or instructions for removing the priority associated with the third RAN based on determining that the UE may be configured with a subscriber identity module card associated with the first operator.

In some examples of the method, apparatuses, and non-transitory computer-readable medium described herein, re-assigning the one or more of the assigned priorities further may include operations, features, means, or instructions for re-assigning the third RAN with a lower priority than the first RAN, or the second RAN, or both based on determining that the UE may be configured with a subscriber identity module card associated with the first operator.

Some examples of the method, apparatuses, and non-transitory computer-readable medium described herein may further include operations, features, means, or instructions for performing the requested IMS call via the second RAN based on establishing the connection with the second RAN.

Some examples of the method, apparatuses, and non-transitory computer-readable medium described herein may further include operations, features, means, or instructions for re-establishing the connection with the first RAN based on completing the performance of the requested IMS call.

Some examples of the method, apparatuses, and non-transitory computer-readable medium described herein may further include operations, features, means, or instructions for determining, while connected with the second RAN, whether the second RAN or the first RAN provides a stronger connection to the UE.

Some examples of the method, apparatuses, and non-transitory computer-readable medium described herein may further include operations, features, means, or instructions for remaining connected to the second RAN following the requested IMS call based on determining that the second RAN provides the UE with the stronger connection.

Some examples of the method, apparatuses, and non-transitory computer-readable medium described herein may further include operations, features, means, or instructions for remaining connected to the second RAN may be based on the UE leaving a coverage area served by the first RAN.

Some examples of the method, apparatuses, and non-transitory computer-readable medium described herein may further include operations, features, means, or instructions for re-establishing the connection with the first RAN following the requested IMS call based on determining that the first RAN provides the UE with the stronger connection.

In some examples of the method, apparatuses, and non-transitory computer-readable medium described herein, the first operator may be associated with a first set of public land mobile networks (PLMN) , the second operator may be associated with a second set of PLMNs, and the first RAN may be associated with the first set of PLMNs and the second set of PLMNs.

BRIEF DESCRIPTION OF THE DRAWINGS

FIG. 1 illustrates an example of a system for wireless communications that supports techniques for re-ordering radio access network (RAN) priorities in accordance with aspects of the present disclosure.

FIG. 2 illustrates an example of a system for wireless communications that supports techniques for re-ordering RAN priorities in accordance with aspects of the present disclosure.

FIG. 3 illustrates an example of a process flow that supports techniques for re-ordering RAN priorities in accordance with aspects of the present disclosure.

FIG. 4 illustrates an example of a process flow that supports techniques for re-ordering RAN priorities in accordance with aspects of the present disclosure.

FIGs. 5 and 6 show block diagrams of devices that support techniques for re-ordering RAN priorities in accordance with aspects of the present disclosure.

FIG. 7 shows a block diagram of a communications manager that supports techniques for re-ordering RAN priorities in accordance with aspects of the present disclosure.

FIG. 8 shows a diagram of a system including a device that supports techniques for re-ordering RAN priorities in accordance with aspects of the present disclosure.

FIGs. 9 through 11 show flowcharts illustrating methods that support techniques for re-ordering RAN priorities in accordance with aspects of the present disclosure.

DETAILED DESCRIPTION

In some wireless communications systems, some operators may combine resources, such as resources provided by a core network of the operator, with resources provided by one or more other operators to deploy a radio access network (RAN) . A RAN that operates under the resources of multiple operators may be referred to as a shared RAN. The shared RAN may provide services (e.g., 5G services) to user equipments (UEs) that are connected to the shared RAN. For example, a first operator and a second operator may combine resources to enable a shared RAN. A UE that is served by either the first operator or the second operator may connect to and camp on the shared RAN. As such, many UEs may camp on the shared RAN.

In some cases, a UE that is camped on the shared RAN may determine to perform an internet protocol (IP) multimedia subsystem (IMS) call, or some other communication. The UE may transmit, to the shared RAN, an indication that the UE has an IMS call to perform. In some cases, the indication may be a request to perform the IMS call. In response, the shared RAN may transmit an radio resource control (RRC) release message to the UE. In some cases, the RRC release message may serve to release the UE from the connection with the shared RAN so that the UE may establish a connection with a non-shared RAN, such as a RAN associated with the operator of the UE. The UE may experience greater success performing the IMS call while connected to a non-shared RAN compared to when the UE is connected to a shared RAN because the shared RAN may serve many UEs served by more than one operator which may cause the shared RAN to have limited available resources. In some cases, the RRC release message may include a priority list, determined by the shared RAN, that ranks the shared RAN and one or more neighboring RANs (e.g., non-shared RANs, or shared RANs, or both) by priority, where at least one of the neighboring RANs included in the list may be a RAN associated with an operator of the UE. Based on the priority list, the UE may connect with the RAN that is indicated as having the highest priority to perform the IMS call.

In some implementations, the shared RAN may be configured to indicate that the shared RAN has the highest priority. As such, upon receiving the RRC release message, the UE may determine to remain connected (or re-establish a connection) with the shared RAN because the shared RAN was assigned the highest priority. The UE may attempt to perform the IMS call via the shared RAN. However, because many UEs may camp on the shared RAN, resources of the shared RAN may be limited. As such, the likelihood that the UE is able to successfully perform the IMS call while connected to the shared RAN may be low.

To improve reliability and efficiency in the network, the UE may be configured to re-order the priorities of the RANs in the list. In some cases, the UE may re-order the priorities based on the SIM card in the UE. For example, the UE may determine that the SIM card in the UE is associated with a first operator. As such, the UE may re-prioritize the RANs such that a RAN included in the list that is associated with the first operator (e.g., a non-shared RAN) is assigned the highest priority and the shared RAN is assigned a lower priority. In some cases, the UE may remove any RAN from the list that is associated with an operator that does not serve the UE. In this way, the UE may connect to a RAN associated with the operator that serves the UE, that the UE assigned the highest priority, so that the UE may perform the IMS call with a higher rate of success.

Particular aspects of the subject matter described herein may be implemented to realize one or more advantages. The described techniques may support improvements in a UE performing communications when initially camped on a shared RAN by improving reliability, and efficiency, other advantages. As such, supported techniques may include improved network operations and, in some examples, may promote network efficiencies, among other benefits.

Aspects of the disclosure are initially described in the context of wireless communications systems. Aspects are then described with respect to process flows. Aspects of the disclosure are further illustrated by and described with reference to apparatus diagrams, system diagrams, and flowcharts that relate to techniques for re-ordering RAN priorities.

FIG. 1 illustrates an example of a wireless communications system 100 that supports techniques for re-ordering RAN priorities in accordance with aspects of the present disclosure. The wireless communications system 100 may include one or more base stations 105, one or more UEs 115, and a core network 130. In some examples, the wireless communications system 100 may be a Long Term Evolution (LTE) network, an LTE-Advanced (LTE-A) network, an LTE-A Pro network, or a New Radio (NR) network. In some examples, the wireless communications system 100 may support enhanced broadband communications, ultra-reliable (e.g., mission critical) communications, low latency communications, communications with low-cost and low-complexity devices, or any combination thereof.

The base stations 105 may be dispersed throughout a geographic area to form the wireless communications system 100 and may be devices in different forms or having different capabilities. The base stations 105 and the UEs 115 may wirelessly communicate via one or more communication links 125. Each base station 105 may provide a coverage area 110 over which the UEs 115 and the base station 105 may establish one or more communication links 125. The coverage area 110 may be an example of a geographic area over which a base station 105 and a UE 115 may support the communication of signals according to one or more radio access technologies.

The UEs 115 may be dispersed throughout a coverage area 110 of the wireless communications system 100, and each UE 115 may be stationary, or mobile, or both at different times. The UEs 115 may be devices in different forms or having different capabilities. Some example UEs 115 are illustrated in FIG. 1. The UEs 115 described herein may be able to communicate with various types of devices, such as other UEs 115, the base stations 105, or network equipment (e.g., core network nodes, relay devices, integrated access and backhaul (IAB) nodes, or other network equipment) , as shown in FIG. 1.

The base stations 105 may communicate with the core network 130, or with one another, or both. For example, the base stations 105 may interface with the core network 130 through one or more backhaul links 120 (e.g., via an S1, N2, N3, or other interface) . The base stations 105 may communicate with one another over the backhaul links 120 (e.g., via an X2, Xn, or other interface) either directly (e.g., directly between base stations 105) , or indirectly (e.g., via core network 130) , or both. In some examples, the backhaul links 120 may be or include one or more wireless links.

One or more of the base stations 105 described herein may include or may be referred to by a person having ordinary skill in the art as a base transceiver station, a radio base station, an access point, a radio transceiver, a NodeB, an eNodeB (eNB) , a next-generation NodeB or a giga-NodeB (either of which may be referred to as a gNB) , a Home NodeB, a Home eNodeB, or other suitable terminology.

A UE 115 may include or may be referred to as a mobile device, a wireless device, a remote device, a handheld device, or a subscriber device, or some other suitable terminology, where the “device” may also be referred to as a unit, a station, a terminal, or a client, among other examples. A UE 115 may also include or may be referred to as a personal electronic device such as a cellular phone, a personal digital assistant (PDA) , a tablet computer, a laptop computer, or a personal computer. In some examples, a UE 115 may include or be referred to as a wireless local loop (WLL) station, an Internet of Things (IoT) device, an Internet of Everything (IoE) device, or a machine type communications (MTC) device, among other examples, which may be implemented in various objects such as appliances, or vehicles, meters, among other examples.

The UEs 115 described herein may be able to communicate with various types of devices, such as other UEs 115 that may sometimes act as relays as well as the base stations 105 and the network equipment including macro eNBs or gNBs, small cell eNBs or gNBs, or relay base stations, among other examples, as shown in FIG. 1.

The UEs 115 and the base stations 105 may wirelessly communicate with one another via one or more communication links 125 over one or more carriers. The term “carrier” may refer to a set of radio frequency spectrum resources having a defined physical layer structure for supporting the communication links 125. For example, a carrier used for a communication link 125 may include a portion of a radio frequency spectrum band (e.g., a bandwidth part (BWP) ) that is operated according to one or more physical layer channels for a given radio access technology (e.g., LTE, LTE-A, LTE-A Pro, NR) . Each physical layer channel may carry acquisition signaling (e.g., synchronization signals, system information) , control signaling that coordinates operation for the carrier, user data, or other signaling. The wireless communications system 100 may support communication with a UE 115 using carrier aggregation or multi-carrier operation. A UE 115 may be configured with multiple downlink component carriers and one or more uplink component carriers according to a carrier aggregation configuration. Carrier aggregation may be used with both frequency division duplexing (FDD) and time division duplexing (TDD) component carriers.

Signal waveforms transmitted over a carrier may be made up of multiple subcarriers (e.g., using multi-carrier modulation (MCM) techniques such as orthogonal frequency division multiplexing (OFDM) or discrete Fourier transform spread OFDM (DFT-S-OFDM) ) . In a system employing MCM techniques, a resource element may consist of one symbol period (e.g., a duration of one modulation symbol) and one subcarrier, where the symbol period and subcarrier spacing are inversely related. The number of bits carried by each resource element may depend on the modulation scheme (e.g., the order of the modulation scheme, the coding rate of the modulation scheme, or both) . Thus, the more resource elements that a UE 115 receives and the higher the order of the modulation scheme, the higher the data rate may be for the UE 115. A wireless communications resource may refer to a combination of a radio frequency spectrum resource, a time resource, and a spatial resource (e.g., spatial layers or beams) , and the use of multiple spatial layers may further increase the data rate or data integrity for communications with a UE 115.

The time intervals for the base stations 105 or the UEs 115 may be expressed in multiples of a basic time unit which may, for example, refer to a sampling period of T _s = 1/ (Δf _max·N _f) seconds, where Δf _max may represent the maximum supported subcarrier spacing, and N _f may represent the maximum supported discrete Fourier transform (DFT) size. Time intervals of a communications resource may be organized according to radio frames each having a specified duration (e.g., 10 milliseconds (ms) ) . Each radio frame may be identified by a system frame number (SFN) (e.g., ranging from 0 to 1023) .

Each frame may include multiple consecutively numbered subframes or slots, and each subframe or slot may have the same duration. In some examples, a frame may be divided (e.g., in the time domain) into subframes, and each subframe may be further divided into a number of slots. Alternatively, each frame may include a variable number of slots, and the number of slots may depend on subcarrier spacing. Each slot may include a number of symbol periods (e.g., depending on the length of the cyclic prefix prepended to each symbol period) . In some wireless communications systems 100, a slot may further be divided into multiple mini-slots containing one or more symbols. Excluding the cyclic prefix, each symbol period may contain one or more (e.g., N _f) sampling periods. The duration of a symbol period may depend on the subcarrier spacing or frequency band of operation.

A subframe, a slot, a mini-slot, or a symbol may be the smallest scheduling unit (e.g., in the time domain) of the wireless communications system 100 and may be referred to as a transmission time interval (TTI) . In some examples, the TTI duration (e.g., the number of symbol periods in a TTI) may be variable. Additionally or alternatively, the smallest scheduling unit of the wireless communications system 100 may be dynamically selected (e.g., in bursts of shortened TTIs (sTTIs) ) .

Physical channels may be multiplexed on a carrier according to various techniques. A physical control channel and a physical data channel may be multiplexed on a downlink carrier, for example, using one or more of time division multiplexing (TDM) techniques, frequency division multiplexing (FDM) techniques, or hybrid TDM-FDM techniques. A control region (e.g., a control resource set (CORESET) ) for a physical control channel may be defined by a number of symbol periods and may extend across the system bandwidth or a subset of the system bandwidth of the carrier. One or more control regions (e.g., CORESETs) may be configured for a set of the UEs 115. For example, one or more of the UEs 115 may monitor or search control regions for control information according to one or more search space sets, and each search space set may include one or multiple control channel candidates in one or more aggregation levels arranged in a cascaded manner. An aggregation level for a control channel candidate may refer to a number of control channel resources (e.g., control channel elements (CCEs) ) associated with encoded information for a control information format having a given payload size. Search space sets may include common search space sets configured for sending control information to multiple UEs 115 and UE-specific search space sets for sending control information to a specific UE 115.

In some examples, a base station 105 may be movable and therefore provide communication coverage for a moving geographic coverage area 110. In some examples, different geographic coverage areas 110 associated with different technologies may overlap, but the different geographic coverage areas 110 may be supported by the same base station 105. In other examples, the overlapping geographic coverage areas 110 associated with different technologies may be supported by different base stations 105. The wireless communications system 100 may include, for example, a heterogeneous network in which different types of the base stations 105 provide coverage for various geographic coverage areas 110 using the same or different radio access technologies.

The wireless communications system 100 may be configured to support ultra-reliable communications or low-latency communications, or various combinations thereof. For example, the wireless communications system 100 may be configured to support ultra-reliable low-latency communications (URLLC) or mission critical communications. The UEs 115 may be designed to support ultra-reliable, low-latency, or critical functions (e.g., mission critical functions) . Ultra-reliable communications may include private communication or group communication and may be supported by one or more mission critical services such as mission critical push-to-talk (MCPTT) , mission critical video (MCVideo) , or mission critical data (MCData) . Support for mission critical functions may include prioritization of services, and mission critical services may be used for public safety or general commercial applications. The terms ultra-reliable, low-latency, mission critical, and ultra-reliable low-latency may be used interchangeably herein.

In some examples, a UE 115 may also be able to communicate directly with other UEs 115 over a device-to-device (D2D) communication link 135 (e.g., using a peer-to-peer (P2P) or D2D protocol) . One or more UEs 115 utilizing D2D communications may be within the geographic coverage area 110 of a base station 105. Other UEs 115 in such a group may be outside the geographic coverage area 110 of a base station 105 or be otherwise unable to receive transmissions from a base station 105. In some examples, groups of the UEs 115 communicating via D2D communications may utilize a one-to-many (1: M) system in which each UE 115 transmits to every other UE 115 in the group. In some examples, a base station 105 facilitates the scheduling of resources for D2D communications. In other cases, D2D communications are carried out between the UEs 115 without the involvement of a base station 105.

The core network 130 may provide user authentication, access authorization, tracking, Internet Protocol (IP) connectivity, and other access, routing, or mobility functions. The core network 130 may be an evolved packet core (EPC) or 5G core (5GC) , which may include at least one control plane entity that manages access and mobility (e.g., a mobility management entity (MME) , an access and mobility management function (AMF) ) and at least one user plane entity that routes packets or interconnects to external networks (e.g., a serving gateway (S-GW) , a Packet Data Network (PDN) gateway (P-GW) , or a user plane function (UPF) ) . The control plane entity may manage non-access stratum (NAS) functions such as mobility, authentication, and bearer management for the UEs 115 served by the base stations 105 associated with the core network 130. User IP packets may be transferred through the user plane entity, which may provide IP address allocation as well as other functions. The user plane entity may be connected to the network operators IP services 150. The network operators IP services 150 may include access to the Internet, Intranet (s) , an IP Multimedia Subsystem (IMS) , or a Packet-Switched Streaming Service.

Some of the network devices, such as a base station 105, may include subcomponents such as an access network entity 140, which may be an example of an access node controller (ANC) . Each access network entity 140 may communicate with the UEs 115 through one or more other access network transmission entities 145, which may be referred to as radio heads, smart radio heads, or transmission/reception points (TRPs) . Each access network transmission entity 145 may include one or more antenna panels. In some configurations, various functions of each access network entity 140 or base station 105 may be distributed across various network devices (e.g., radio heads and ANCs) or consolidated into a single network device (e.g., a base station 105) .

The wireless communications system 100 may operate using one or more frequency bands, typically in the range of 300 megahertz (MHz) to 300 gigahertz (GHz) . Generally, the region from 300 MHz to 3 GHz is known as the ultra-high frequency (UHF) region or decimeter band because the wavelengths range from approximately one decimeter to one meter in length. The UHF waves may be blocked or redirected by buildings and environmental features, but the waves may penetrate structures sufficiently for a macro cell to provide service to the UEs 115 located indoors. The transmission of UHF waves may be associated with smaller antennas and shorter ranges (e.g., less than 100 kilometers) compared to transmission using the smaller frequencies and longer waves of the high frequency (HF) or very high frequency (VHF) portion of the spectrum below 300 MHz.

The wireless communications system 100 may utilize both licensed and unlicensed radio frequency spectrum bands. For example, the wireless communications system 100 may employ License Assisted Access (LAA) , LTE-Unlicensed (LTE-U) radio access technology, or NR technology in an unlicensed band such as the 5 GHz industrial, scientific, and medical (ISM) band. When operating in unlicensed radio frequency spectrum bands, devices such as the base stations 105 and the UEs 115 may employ carrier sensing for collision detection and avoidance. In some examples, operations in unlicensed bands may be based on a carrier aggregation configuration in conjunction with component carriers operating in a licensed band (e.g., LAA) . Operations in unlicensed spectrum may include downlink transmissions, uplink transmissions, P2P transmissions, or D2D transmissions, among other examples.

A base station 105 or a UE 115 may be equipped with multiple antennas, which may be used to employ techniques such as transmit diversity, receive diversity, multiple-input multiple-output (MIMO) communications, or beamforming. The antennas of a base station 105 or a UE 115 may be located within one or more antenna arrays or antenna panels, which may support MIMO operations or transmit or receive beamforming. For example, one or more base station antennas or antenna arrays may be co-located at an antenna assembly, such as an antenna tower. In some examples, antennas or antenna arrays associated with a base station 105 may be located in diverse geographic locations. A base station 105 may have an antenna array with a number of rows and columns of antenna ports that the base station 105 may use to support beamforming of communications with a UE 115. Likewise, a UE 115 may have one or more antenna arrays that may support various MIMO or beamforming operations. Additionally or alternatively, an antenna panel may support radio frequency beamforming for a signal transmitted via an antenna port.

Beamforming, which may also be referred to as spatial filtering, directional transmission, or directional reception, is a signal processing technique that may be used at a transmitting device or a receiving device (e.g., a base station 105, a UE 115) to shape or steer an antenna beam (e.g., a transmit beam, a receive beam) along a spatial path between the transmitting device and the receiving device. Beamforming may be achieved by combining the signals communicated via antenna elements of an antenna array such that some signals propagating at particular orientations with respect to an antenna array experience constructive interference while others experience destructive interference. The adjustment of signals communicated via the antenna elements may include a transmitting device or a receiving device applying amplitude offsets, phase offsets, or both to signals carried via the antenna elements associated with the device. The adjustments associated with each of the antenna elements may be defined by a beamforming weight set associated with a particular orientation (e.g., with respect to the antenna array of the transmitting device or receiving device, or with respect to some other orientation) .

A UE 115 may establish a connection with a first RAN (e.g., a shared RAN, shared base station 105) , where the first RAN may be associated with a first operator and a second operator. The UE 115 may transmit, to the first RAN, a request to perform an IMS call as part of an IMS call setup procedure, and the UE 115 may receive, from the first RAN, an RRC release message in response to the request and during the IMS call setup procedure. The RRC release message may indicate a set of RANs (e.g., or a set of frequencies each associated with a RAN) , where each RAN of the set of RANs is assigned a priority. The priority may indicate to the UE 115 which RAN the UE should attempt to connect to first. The UE 115 may re-assign one or more of the assigned priorities associated with one or more RANs of the set of RANs based on an operator that serves the UE 115. The UE 115 may establish a connection with a second RAN (e.g., a RAN associated with the operator of the UE 115) based on the re-assigned one or more priorities. Upon establishing a connection with the second RAN, the UE 115 may perform the IMS call.

FIG. 2 illustrates an example of a wireless communications system 200 that supports techniques for re-ordering RAN priorities in accordance with aspects of the present disclosure. The wireless communications system 200 may include core networks 205-a and 205-b, base stations 105-a, 105-b, and 105-c and UEs 115-a and 115-b, which may be examples of base stations 105 and UEs 115 as described with reference to FIG. 1. The base stations may each serve a different geographic coverage area, where the coverage areas may overlap. In some cases, one or more of the UEs 115 may re-order a list of priorities associated with base stations 105-a, 105-b, and 105-c. Additionally or alternatively, other wireless devices, such as a base station 105, or some combination of the base stations 105, may implement a priority re-assignment procedure.

Wireless communications system 200 may include core networks 205-a and 205-b where each may provide services to UEs 115 who are connected to a base station 105 (e.g., RAN) served by the core network 205. Each core network 205 may be operated by a different operator (e.g., China Telecom, China Unicom) . Each core network 205 may serve one or more base stations 105, where each base station 105 may be connected to core network 205 via a backhaul link 220. For example, base station 105-a may be connected to core network 205-a via backhaul link 220-a, base station 105-b may be connected to core network 205-a via backhaul link 220-b and to core network 205-b via backhaul link 220-c, and base station 105-c may be connected to core network 205-c via backhaul link 220-d. As such, base stations 105-a and 105-c may each be served by a single core network 205, where the core networks 205 that serve each of base station 105-a and 105-c are different.

Base station 105-b may be referred to as a shared base station 105 (e.g., shared RAN) because base station 105-b is served by more than one core network 205. In some cases, a core network 205 may combine resources (e.g., time resources, frequency resources) with one or more other core networks 205 to enable a shared base station 105. In some implementations, core networks 205 may combine resources with one or more other core networks 205 to efficiently extend the coverage, such as 5G network coverage, of each core network 205. For example, UEs 115 that are served by either core network 205-a or 205-b may connect to shared base station 105-b to receive the 5G coverage, or some other coverage. As such, the resources of a non-shared base station 105 (e.g., base station 105-a and 105-c) may be conserved, such as for non-5G communications.

Each core network 205 may be assigned a different public land mobile network (PLMN) identifier to distinguish the core networks 205. As such, each base station 105 may also be assigned a PLMN based on the PLMN of the core network 205 that serves the base station. For example, core network 205-a may be assigned a first PLMN ID, such as 460-11, and core network 205-b may be assigned a second PLMN ID, such as 460-01. As base station 105-a is served only by core network 205-a, base station 105-a may be assigned the first PLMN ID, and as base station 105-c is served only by core network 205-b, base station 105-c may be assigned the second PLMN ID. As base station 105-b is a shared base station 105, base station 105-b may be assigned a combination of the first PLMN ID and the second PLMN ID. For example, base station 105-b may be assigned a PLMN ID of 460-01/460-11 (or 460-11/460-01) . In some cases, core network 205-a may be associated with a first set of PLMNs, core network 205-b may be associated with a second set of PLMNs, and base station 105-b may be associated with the first set and the second set.

A UE 115 that is served by an operator associated with core network 105-a may connect to base station 105-a and communicate via communications link 210-a or base station 105-b and communicate over communications link 210-b. A UE 115 that is served by an operator associated with core network 105-b may connect to base station 105-c and communicate over communications link 210-d or base station 105-b and communicate over communications link 210-c. In some cases, UEs 115 may be configured to connect to and camp on a shared network that is at least partially served by an operator associated with the UE 115, such as base station 105-b. For example, UEs 115 may connect to and camp on shared base station 105-b even if the UEs 115 can connect to a non-shared base station 105 (e.g., base station 105-a, or base station 105-c) . In some cases, base station 105-b may serve more UEs 115 than either base station 105-a or 105-c because UEs 115 that are served by core network 205-a and UEs 115 that are served by core network 205-b may both connect to the shared base station 105-b. As such, when a UE 115 has a communication to perform, such as an IMS call, the UE 115 may be released from the shared base station 105-b and re-directed to a neighboring base station 105 (e.g., base station 105-a or base station 105-c depending on the operator of the UE 115) with sufficient resources (e.g., radio resources) so that the UE 115 may perform the IMS call with a higher rate of success as compared to performing the IMS call via shared base station 105-b because the shared base station 105-b may have limited available resources due to the large number of UEs 115 shared base station 105-b serves.

For example, UE 115-a may be served by core network 105-a and may camp on base station 105-b. UE 115-a may determine to perform or be triggered to perform an IMS call. Upon this determination, UE 115-a may transmit an indication of the IMS call, such as a request to perform the IMS call, to shared base station 105-b. In response, base station 105-b may transmit an RRC release message to UE 115-a that may initiate UE 115-a to release from base station 105-b so that UE 115-a may connect to a neighboring base station 105 to perform the IMS call. In some cases, base station 105-b may include, within the RRC release message, a list of base stations 105, such as neighboring base stations 105, where the list may indicate a priority associated with each base station 105 in the list. In some cases, the priorities may be implicitly indicated or explicitly indicated. For example, the base station 105 may be ordered in the list, where the order indicates the priority of the base station 105 based on the location of the base station 105 within the list. In some cases, the priorities may be indicated in relation to the frequencies associated with each base station 105. For example, the list may be a list of frequencies (e.g., FreqPriorityNR list) , where the list indicates the priority of each frequency, and thus, the priority of each neighboring base station 105. For example, each base station 105 in wireless communications system 200 may operate using a different frequency. Base station 105-a may use a first frequency (F1) , base station 105-c may use a second frequency (F2) , and base station 105-b may use a third frequency (F3) . The frequency priority list may order the frequencies to indicate which base station 105 has the highest priority. The UE 115 may use the frequency priority list to determine which base station 105 to connect with to perform the IMS call.

Shared base station 105-b may determine the priorities associated with each base station 105. In some cases, shared base station 105-b may be configured to assign itself the highest priority. For example, shared base station 105-b may transmit the RRC release message with a frequency priority list that indicates the third frequency (e.g., the frequency associated with shared base station 105-b) as the highest priority (e.g., F3>F1=F2, F3>F2>F1, or F3>F1>F2) . The UE 115 may recognize that the shared base station 105-b is assigned the highest priority and re-connect (or remain connected) to the shared base station 105-b to perform the IMS call via the shared base station 105-b. However, as described herein, the shared base station 105-b may have limited available resources due to the high number of UEs 115 camped on shared base station 105-b. As such, the UE 115 may have relatively poor success in completing the IMS call while connected to shared base station 105-b due to insufficient resources (e.g., radio resources) .

To improve reliability and efficiency in the network, a UE 115 may be configured to re-prioritize the base stations 105 (e.g., the frequencies) in the list. For example, the UE 115 may re-prioritize the base stations 105 such that the UE 115 is re-directed to a non-shared base station 105. In some cases, the re-prioritization may be based on the operator of the UE 115, where the UE 115 may re-prioritize to assign the highest priority to a base station that is associated with the operator of the UE 115. In some cases, the UE 115 may determine the operator of the UE 115 based on a subscriber entity module (SIM) card in the UE 115 because the SIM card includes an indication (e.g., an international mobile subscriber identity (IMSI) ) of an operator serving the UE 115. A UE 115 may determine which operator is serving the UE 115 based on the SIM card in the UE 115, and the UE 115 may re-order the base stations 105 in the priority list to indicate that a base station 105 that is served only by the operator of the UE 115 has the highest priority.

For example, UE 115-a and UE 115-b may each be camped on shared base station 105-b, where UE 115-a is served by core network 205-a and UE 115-b is served by core network 205-b. Each UE 115 may determine, at some point (e.g., at the same time, or different times) , to perform an IMS call, and each may transmit a request to perform the IMS call to base station 105-b (e.g., via communication links 210-b and 210-c) . Each UE 115 may receive an RRC release message from shared base station 105-b that releases or initiates a release of connection with base station 105-b and includes the priority list, where the shared base station 105-b is indicated as having the highest priority in the list. Each UE 115 may determine, prior to, during, or in response to receiving the RRC release message, which SIM card each UE 115 has. For example, UE 115-a may determine that it has a SIM card associated with core network 205-a, where base station 105-a is served only my core network 205-a, and UE 115-b may determine that it has a SIM card associated with core network 205-b, where base station 105-c is served only by core network 205-b. As such, each UE 115 may perform a re-assignment procedure, where the re-assignment procedures performed by each UE 115 may be independent of one another. UE 115-a may re-assign at least the priority of base station 105-a to have the highest priority (e.g., F1>F3>F2 or F1>F3=F2) and UE 115-b may re-assign at least the priority of base station 105-c to have the highest priority (e.g., F2>F3>F1 or F2>F3=F1) .

In some cases, a UE 115 may drop one or more base stations 105 from the priority list that the UE 115 is unable to connect to, or the UE 115 may re-assign these base stations 105 has having the lowest priority. For example, because UE 115-a is served by core network 205-a, UE 115-a may be unable to connect to any base station 105 served only by core network 205-b, such as base station 105-c. Similarly, as UE 115-b is served by core network 205-b, UE 115-b may be unable to connect to any base station 105 that is served only by core network 205-a, such as base station 105-a. As such, UE 115-a may drop base station 105-c (e.g., or the frequency associated with base station 105-c, F2) from the frequency priority list, or UE 115-a may re-assign base station 105-c to have the lowest priority (e.g., F1>F3, F1>F3>F2 or F1>F3=F2) . UE 115-b may drop base station 105-a (e.g., or the frequency associated with base station 105-a, F1) from the frequency priority list, or UE 115-b may re-assign base station 105-a to have the lowest priority (e.g., F2>F3, F2>F3>F1, or F2>F3=F1) .

Each UE 115 may connect to the base station 105 with the highest priority according to the re-ordered priority list. For example, UE 115-a may perform a handover procedure with base station 105-a to perform the IMS call via base station 105-a over communication link 210-a, and UE 115-b may perform a handover procedure with base station 105-c to perform the IMS call via base station 105-c over communication link 210-d. In some cases, upon completion of the IMS call, each UE 115 may be released from the non-shared base station 105 (e.g., base station 105-a, or base station 105-c) , and re-connect to shared base station 105-b. In some cases, each UE 115 may re-order the priority list each time the UE 115 has an IMS call to perform. In some cases, the UE 115 may be configured to automatically re-connect with shared base station 105-b following the IMS call, or the UE 115 may be configured to re-connect with shared base station 105-b if shared base station 105-b meets one or more conditions. For example, the UE 115 may determine whether base station 105-b or a non-shared base station 105 provides a stronger connection (e.g., such as a stronger 5G connection, or stronger overall connection) to the UE 115. If the UE 115 determines that shared base station 105-b provides the stronger connection, the UE 115 may re-connect to shared base station 105-b.

In some cases, a UE 115 may remain connected to the non-shared base station 105 the UE 115 connected to perform the IMS call after completion of the IMS call. For example, a UE 115 may determine that the non-shared base station 105 provides the UE 115 with the stronger connection as compared to the connection provided by shared base station 105-b. In some cases, the UE 115 may remain connected to the non-shared base station 105 following the IMS call based on the non-shared base station 105 providing the stronger connection to the UE 115. In some cases, the UE 115 may remain connected to the non-shared base station 105 based on the UE 115 moving out of the coverage area of shared base station 105-b.

FIG. 3 illustrates an example of a process flow 300 that supports techniques for re-ordering RAN priorities in accordance with aspects of the present disclosure. The process flow 300 may illustrate an example IMS call procedure. For example, UE 115-c may perform an IMS call procedure with base station 105-d and base station 105-e that may include UE 115-c re-ordering priorities associated with base stations 105-d, 105-e, or both. Base stations 105-d and 105-e, as well as UE 115-c may be examples of the corresponding wireless devices described with reference to FIGs. 1 and 2. In some cases, instead of UE 115-c implementing the IMS call procedure, a different type of wireless device (e.g., a base station 105) may perform the IMS call procedure, or priority re-ordering procedure, or both. Alternative examples of the following may be implemented, where some steps are performed in a different order than described or are not performed at all. In some cases, steps may include additional features not mentioned below, or further steps may be added.

In some wireless communications, such as the wireless communications system as described with reference to FIG. 2, may include one or more shared base stations 105 (e.g., shared RANs) , one or more non-shared base stations 105 (e.g., non-shared RANs) , or both. A shared base station 105 may refer to a base station 105 that is provided resources from more than one operator (or core network) and a non-shared base station 105 may refer to a base station that is provided resources by one operator (or core network) . For example, base station 105-d may be a shared base station 105 and base station 105-e may be a non-shared base station 105.

At 305, UE 115-c may establish a connection with base station 105-d (e.g., a first RAN) , where base station 105-d is associated with a first operator and a second operator which results in base station 105-d being a shared base station 105. In some implementations, the first operator is associated with a first set of PLMNs, the second operator is associated with a second set of PLMNs, and base station 105-d is associated with the first set of PLMNs and the second set of PLMNs.

At 310, UE 115-c may transmit, to base station 105-d, a request to setup an IMS call as part of an IMS call setup procedure.

At 315, UE 115-c may receive, from base station 105-d, an RRC release message during the IMS call setup procedure. In some cases, UE 115-c may receive the RRC release message in response to the request. The RRC release message may indicate a set of frequencies (e.g., a list of frequencies) each associated with a base station, where each frequency of the set of frequencies is assigned a priority. For example, the set of frequencies may include at least a frequency associated with base station 105-d and a frequency associated with base station 105-e, where each of the two frequencies may be different and each may be assigned a priority. In some cases, the set of frequencies may include a frequency associated with a third base station 105 (not depicted in FIG. 3) . In some cases, the frequency associated with base station 105-d may be higher than the frequency associated with base station 105-e.

In some cases, UE 115-c may determine that UE 115-c is configured with a SIM card associated with the first operator. In some cases, base station 105-e may be a non-shared base station 105 served by the first operator, where the first operator may serve one or more non-shared base stations 105, one or more shared base stations 105, or both. In some cases, the second operator may serve one or more non-shared base stations 105 (not depicted in FIG. 3) , one or more shared base stations 105, or both. For example, the second operator may be associated with the third base station 105 (e.g., a third RAN) not depicted in FIG. 3.

At 320, UE 115-c may re-assign one or more of the assigned priorities associated with one or more frequencies of the plurality of frequencies. In some implementations, UE 115-c may re-assign base station 105-e (e.g., the frequency associated with base station 105-e) with a higher priority than base station 105-d (e.g., the frequency associated with base station 105-d) based on determining that UE 115-c is configured with a SIM card associated with the first operator, where base station 105-e is served by the first operator. In some implementations, UE 115-c may remove the priority associated with the third base station 105 based on determining that UE 115-c is configured with a SIM card associated with the first operator. For example, because UE 115-c is configured with a first operator SIM card, UE 115-c may not be able to connect to the third base station 105 that is served by only the second operator. As such, UE 115-c may remove the frequency (e.g., priority) associated with the third base station 105. In some cases, UE 115-c may re-assign the third base station 105 with a lower priority than base station 105-d, or base station 105-e, or both based on determining that UE 115-c is configured with a SIM card associated with the first operator. For example, rather than removing the priority associated with the third base station 105, UE 115-c may re-assign the priority associated with the third base station as a low (e.g., lowest) priority.

At 325, UE 115-c may establish a connection with base station 105-e based on the re-assigned one or more priorities. UE 115-c may perform the requested IMS call via base station 105-e based on establishing a connection with base station 105-e. In some implementations, UE 115-c may re-establish a connection with base station 105-d based on completing the performance of the requested IMS call.

In some cases, UE 115-c may determine, while connected with base station 105-e, whether base station 105-e or base station 105-d provides a stronger connection to UE 115-c. UE 115-c may remain connected to base station 105-e following the requested IMS call based on determining that base station 105-e provides UE 115-c with the stronger connection. In some cases, remaining connected to base station 105-e is based on UE 115-c leaving a coverage area served by base station 105-d. In some cases, UE 115-c may re-establish the connection with base station 105-d following the requested IMS call based on determining that base station 105-d provided UE 115-c with a stronger connection.

FIG. 4 illustrates an example of a process flow 400 that supports techniques for re-ordering RAN priorities in accordance with aspects of the present disclosure. The process flow 400 (e.g., call flow) may illustrate an example IMS call procedure. For example, UE 115-d may perform an IMS call procedure with base station 105-f and base station 105-g that may include UE 115-d re-ordering priorities associated with base stations 105-f, 105-g, or both. Base stations 105-f and 105-g, as well as UE 115-d may be examples of the corresponding wireless devices described with reference to FIGs. 1 through 3. In some cases, instead of UE 115-d implementing the IMS call procedure, a different type of wireless device (e.g., a base station 105) may perform the IMS call procedure, or priority re-ordering procedure, or both. Alternative examples of the following may be implemented, where some steps are performed in a different order than described or are not performed at all. In some cases, steps may include additional features not mentioned below, or further steps may be added.

At 405, UE 115-d may successfully camp on a shared network and successfully register an IMS service. For example, UE 115-d may establish a connection with base station 105-f, where base station 105-f is a shared network.

At 410, UE 115-d may identify a mobile originated (MO) and/or mobile terminated (MT) call trigger. For example, UE 115-d may receive a trigger to perform an MO and/or MT call.

At 415, UE 115-d may transmit, to base station 105-f, a request to setup an IMS call as part of an IMS call setup procedure. For example, UE 115-d may transmit an invite message, such as an session initiation protocol (SIP) invite message (e.g., IMS_SIP_INVITE) , to base station 105-f.

At 420, UE 115-d may receive, from base station 105-f a trying message (e.g., TRYING (100) ) , in response to the invite message. The trying message may indicate that base station 105-f is attempting to reach UE 115-d. In some cases, the trying message may be part of the IMS call setup procedure.

At 425, UE 115-d may receive, from base station 105-f, an RRC connection release message that may include a set of priorities (e.g., FreqPriorityList) , where each priority in the set is associated with a different base station 105 as described with reference to FIG. 3. In some cases, the set of priorities may be a set of frequencies, where each frequency is associated with a different base station 105, and each frequency is assigned a priority. In some case, the priority list may indicate that base station 105-f is assigned the highest priority in the list.

At 430, UE 115-d may re-order (e.g., re-assign, re-prioritize) the list of priorities. For example, as described with reference to FIG. 3, UE 115-d may re-order the list based on the SIM card that UE 115-d is configured with. For example, UE 115-d may be configured with a SIM card that is associated with a first operator. UE 115-d may determine that base station 105-g is a non-shared base station 105 served only by the first operator. As such, UE 115-d may re-order the priorities to assign the base station 105-g the highest priority.

At 435, UE 115-d may perform a handover procedure to establish a connection with base station 105-g. In some cases, UE 115-d may establish the connection with base station 105-g based on re-ordering the priorities where base station 105-g is associated with the highest priority.

At 440, UE 115-d may successfully setup an IMS call voice session with base station 105-g such that UE 115-d may perform the MO or MT IMS call.

FIG. 5 shows a block diagram 500 of a device 505 that supports techniques for re-ordering RAN priorities in accordance with aspects of the present disclosure. The device 505 may be an example of aspects of a UE 115 as described herein. The device 505 may include a receiver 510, a communications manager 515, and a transmitter 520. The device 505 may also include a processor. Each of these components may be in communication with one another (e.g., via one or more buses) .

The receiver 510 may receive information such as packets, user data, or control information associated with various information channels (e.g., control channels, data channels, and information related to techniques for re-ordering RAN priorities, etc. ) . Information may be passed on to other components of the device 505. The receiver 510 may be an example of aspects of the transceiver 820 described with reference to FIG. 8. The receiver 510 may utilize a single antenna or a set of antennas.

The communications manager 515 may establish a connection with a first RAN, the first RAN associated with a first operator and a second operator, transmit, to the first RAN, a request to setup an IMS call as part of an IMS call setup procedure, receive a RRC release message during the IMS call setup procedure, the RRC release message indicating a set of frequencies each associated with a RAN, where each frequency of the set of frequencies is assigned a priority, re-assign one or more of the assigned priorities associated with one or more frequencies of the set of frequencies, and establish a connection with a second RAN based on the re-assigned one or more priorities. The communications manager 515 may be an example of aspects of the communications manager 810 described herein.

The communications manager 515, or its sub-components, may be implemented in hardware, code (e.g., software or firmware) executed by a processor, or any combination thereof. If implemented in code executed by a processor, the functions of the communications manager 515, or its sub-components may be executed by a general-purpose 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 in the present disclosure.

The communications manager 515, or its sub-components, may be physically located at various positions, including being distributed such that portions of functions are implemented at different physical locations by one or more physical components. In some examples, the communications manager 515, or its sub-components, may be a separate and distinct component in accordance with various aspects of the present disclosure. In some examples, the communications manager 515, or its sub-components, may be combined with one or more other hardware components, including but not limited to an input/output (I/O) component, a transceiver, a network server, another computing device, one or more other components described in the present disclosure, or a combination thereof in accordance with various aspects of the present disclosure.

The transmitter 520 may transmit signals generated by other components of the device 505. In some examples, the transmitter 520 may be collocated with a receiver 510 in a transceiver module. For example, the transmitter 520 may be an example of aspects of the transceiver 820 described with reference to FIG. 8. The transmitter 520 may utilize a single antenna or a set of antennas.

The communications manager 515 as described herein may be implemented to realize one or more potential advantages. One implementation may allow the device 505 to more reliably and efficiently perform an IMS call when the device 505 is initially camped on a shared network. For example, a device 505 may re-order a priority list to allow the device 505 to connected to a different RAN than was initially indicated as having the highest priority to allow the device 505 to perform the IMS call via a non-shared RAN, where performing the IMS call via the non-shared RAN may be more reliable than performing the IMS call via a shared RAN.

Based on implementing the priority re-ordering techniques as described herein, a processor of a UE 115 (e.g., controlling the receiver 510, the transmitter 520, or the transceiver 820 as described with reference to FIG. 8) may increase reliability and efficiency in the performance of an IMS call between a UE 115 and a base station 105.

FIG. 6 shows a block diagram 600 of a device 605 that supports techniques for re-ordering RAN priorities in accordance with aspects of the present disclosure. The device 605 may be an example of aspects of a device 505, or a UE 115 as described herein. The device 605 may include a receiver 610, a communications manager 615, and a transmitter 645. The device 605 may also include a processor. Each of these components may be in communication with one another (e.g., via one or more buses) .

The receiver 610 may receive information such as packets, user data, or control information associated with various information channels (e.g., control channels, data channels, and information related to techniques for re-ordering RAN priorities, etc. ) . Information may be passed on to other components of the device 605. The receiver 610 may be an example of aspects of the transceiver 820 described with reference to FIG. 8. The receiver 610 may utilize a single antenna or a set of antennas.

The communications manager 615 may be an example of aspects of the communications manager 515 as described herein. The communications manager 615 may include a first RAN connection manager 620, an IMS call request manager 625, a RRC message receiver 630, a priority manager 635, and a second RAN connection manager 640. The communications manager 615 may be an example of aspects of the communications manager 810 described herein.

The first RAN connection manager 620 may establish a connection with a first RAN, the first RAN associated with a first operator and a second operator. The IMS call request manager 625 may transmit, to the first RAN, a request to setup an IMS call as part of an IMS call setup procedure. The RRC message receiver 630 may receive a RRC release message during the IMS call setup procedure, the RRC release message indicating a set of frequencies each associated with a RAN, where each frequency of the set of frequencies is assigned a priority. The priority manager 635 may re-assign one or more of the assigned priorities associated with one or more frequencies of the set of frequencies. The second RAN connection manager 640 may establish a connection with a second RAN based on the re-assigned one or more priorities.

The transmitter 645 may transmit signals generated by other components of the device 605. In some examples, the transmitter 645 may be collocated with a receiver 610 in a transceiver module. For example, the transmitter 645 may be an example of aspects of the transceiver 820 described with reference to FIG. 8. The transmitter 645 may utilize a single antenna or a set of antennas.

FIG. 7 shows a block diagram 700 of a communications manager 705 that supports techniques for re-ordering RAN priorities in accordance with aspects of the present disclosure. The communications manager 705 may be an example of aspects of a communications manager 515, a communications manager 615, or a communications manager 810 described herein. The communications manager 705 may include a first RAN connection manager 710, an IMS call request manager 715, a RRC message receiver 720, a priority manager 725, a second RAN connection manager 730, a SIM card manager 735, and an IMS call manager 740. Each of these modules may communicate, directly or indirectly, with one another (e.g., via one or more buses) .

The first RAN connection manager 710 may establish a connection with a first RAN, the first RAN associated with a first operator and a second operator. The IMS call request manager 715 may transmit, to the first RAN, a request to setup an IMS call as part of an IMS call setup procedure. The RRC message receiver 720 may receive a RRC release message during the IMS call setup procedure, the RRC release message indicating a set of frequencies each associated with a RAN, where each frequency of the set of frequencies is assigned a priority. The priority manager 725 may re-assign one or more of the assigned priorities associated with one or more frequencies of the set of frequencies. The second RAN connection manager 730 may establish a connection with a second RAN based on the re-assigned one or more priorities.

The SIM card manager 735 may determine that the UE is configured with a subscriber identity module card associated with the first operator, the first operator associated with the second RAN, the second operator associated with a third RAN. In some examples, the priority manager 725 may re-assign the second RAN with a higher priority than the first RAN based on determining that the UE is configured with a subscriber identity module card associated with the first operator. In some examples, the priority manager 725 may remove the priority associated with the third RAN based on determining that the UE is configured with a subscriber identity module card associated with the first operator. In some examples, the priority manager 725 may re-assign the third RAN with a lower priority than the first RAN, or the second RAN, or both based on determining that the UE is configured with a subscriber identity module card associated with the first operator.

The IMS call manager 740 may perform the requested IMS call via the second RAN based on establishing the connection with the second RAN. In some examples, the first RAN connection manager 710 may re-establish the connection with the first RAN based on completing the performance of the requested IMS call.

In some examples, the second RAN connection manager 730 may determine, while connected with the second RAN, whether the second RAN or the first RAN provides a stronger connection to the UE. In some examples, the second RAN connection manager 730 may remain connected to the second RAN following the requested IMS call based on determining that the second RAN provides the UE with the stronger connection. In some examples, the second RAN connection manager 730 may remain connected to the second RAN is based on the UE leaving a coverage area served by the first RAN.

In some examples, the first RAN connection manager 710 may re-establish the connection with the first RAN following the requested IMS call based on determining that the first RAN provides the UE with the stronger connection.

In some cases, the first operator is associated with a first set of PLMNs, the second operator is associated with a second set of PLMNs, and the first RAN is associated with the first set of PLMNs and the second set of PLMNs.

FIG. 8 shows a diagram of a system 800 including a device 805 that supports techniques for re-ordering RAN priorities in accordance with aspects of the present disclosure. The device 805 may be an example of or include the components of device 505, device 605, or a UE 115 as described herein. The device 805 may include components for bi-directional voice and data communications including components for transmitting and receiving communications, including a communications manager 810, an I/O controller 815, a transceiver 820, an antenna 825, memory 830, and a processor 840. These components may be in electronic communication via one or more buses (e.g., bus 845) .

The communications manager 810 may establish a connection with a first RAN, the first RAN associated with a first operator and a second operator, transmit, to the first RAN, a request to setup an IMS call as part of an IMS call setup procedure, receive a RRC release message during the IMS call setup procedure, the RRC release message indicating a set of frequencies each associated with a RAN, where each frequency of the set of frequencies is assigned a priority, re-assign one or more of the assigned priorities associated with one or more frequencies of the set of frequencies, and establish a connection with a second RAN based on the re-assigned one or more priorities.

The I/O controller 815 may manage input and output signals for the device 805. The I/O controller 815 may also manage peripherals not integrated into the device 805. In some cases, the I/O controller 815 may represent a physical connection or port to an external peripheral. In some cases, the I/O controller 815 may utilize an operating system such as

or another known operating system. In other cases, the I/O controller 815 may represent or interact with a modem, a keyboard, a mouse, a touchscreen, or a similar device. In some cases, the I/O controller 815 may be implemented as part of a processor. In some cases, a user may interact with the device 805 via the I/O controller 815 or via hardware components controlled by the I/O controller 815.

The transceiver 820 may communicate bi-directionally, via one or more antennas, wired, or wireless links as described above. For example, the transceiver 820 may represent a wireless transceiver and may communicate bi-directionally with another wireless transceiver. The transceiver 820 may also include a modem to modulate the packets and provide the modulated packets to the antennas for transmission, and to demodulate packets received from the antennas.

In some cases, the wireless device may include a single antenna 825. However, in some cases the device may have more than one antenna 825, which may be capable of concurrently transmitting or receiving multiple wireless transmissions.

The memory 830 may include random-access memory (RAM) and read-only memory (ROM) . The memory 830 may store computer-readable, computer-executable code 835 including instructions that, when executed, cause the processor to perform various functions described herein. In some cases, the memory 830 may contain, among other things, a basic I/O system (BIOS) which may control basic hardware or software operation such as the interaction with peripheral components or devices.

The processor 840 may include an intelligent hardware device, (e.g., a general-purpose processor, a DSP, a CPU, a microcontroller, an ASIC, an FPGA, a programmable logic device, a discrete gate or transistor logic component, a discrete hardware component, or any combination thereof) . In some cases, the processor 840 may be configured to operate a memory array using a memory controller. In other cases, a memory controller may be integrated into the processor 840. The processor 840 may be configured to execute computer-readable instructions stored in a memory (e.g., the memory 830) to cause the device 805 to perform various functions (e.g., functions or tasks supporting techniques for re-ordering RAN priorities) .

The code 835 may include instructions to implement aspects of the present disclosure, including instructions to support wireless communications. The code 835 may be stored in a non-transitory computer-readable medium such as system memory or other type of memory. In some cases, the code 835 may not be directly executable by the processor 840 but may cause a computer (e.g., when compiled and executed) to perform functions described herein.

FIG. 9 shows a flowchart illustrating a method 900 that supports techniques for re-ordering RAN priorities in accordance with aspects of the present disclosure. The operations of method 900 may be implemented by a UE 115 or its components as described herein. For example, the operations of method 900 may be performed by a communications manager as described with reference to FIGs. 5 through 8. In some examples, a UE may execute a set of instructions to control the functional elements of the UE to perform the functions described below. Additionally or alternatively, a UE may perform aspects of the functions described below using special-purpose hardware.

At 905, the UE may establish a connection with a first RAN, the first RAN associated with a first operator and a second operator. The operations of 905 may be performed according to the methods described herein. In some examples, aspects of the operations of 905 may be performed by a first RAN connection manager as described with reference to FIGs. 5 through 8.

At 910, the UE may transmit, to the first RAN, a request to setup an IMS call as part of an IMS call setup procedure. The operations of 910 may be performed according to the methods described herein. In some examples, aspects of the operations of 910 may be performed by an IMS call request manager as described with reference to FIGs. 5 through 8.

At 915, the UE may receive a RRC release message during the IMS call setup procedure, the RRC release message indicating a set of frequencies each associated with a RAN, where each frequency of the set of frequencies is assigned a priority. The operations of 915 may be performed according to the methods described herein. In some examples, aspects of the operations of 915 may be performed by a RRC message receiver as described with reference to FIGs. 5 through 8.

At 920, the UE may re-assign one or more of the assigned priorities associated with one or more frequencies of the set of frequencies. The operations of 920 may be performed according to the methods described herein. In some examples, aspects of the operations of 920 may be performed by a priority manager as described with reference to FIGs. 5 through 8.

At 925, the UE may establish a connection with a second RAN based on the re-assigned one or more priorities. The operations of 925 may be performed according to the methods described herein. In some examples, aspects of the operations of 925 may be performed by a second RAN connection manager as described with reference to FIGs. 5 through 8.

FIG. 10 shows a flowchart illustrating a method 1000 that supports techniques for re-ordering RAN priorities in accordance with aspects of the present disclosure. The operations of method 1000 may be implemented by a UE 115 or its components as described herein. For example, the operations of method 1000 may be performed by a communications manager as described with reference to FIGs. 5 through 8. In some examples, a UE may execute a set of instructions to control the functional elements of the UE to perform the functions described below. Additionally or alternatively, a UE may perform aspects of the functions described below using special-purpose hardware.

At 1005, the UE may establish a connection with a first RAN, the first RAN associated with a first operator and a second operator. The operations of 1005 may be performed according to the methods described herein. In some examples, aspects of the operations of 1005 may be performed by a first RAN connection manager as described with reference to FIGs. 5 through 8.

At 1010, the UE may transmit, to the first RAN, a request to setup an IMS call as part of an IMS call setup procedure. The operations of 1010 may be performed according to the methods described herein. In some examples, aspects of the operations of 1010 may be performed by an IMS call request manager as described with reference to FIGs. 5 through 8.

At 1015, the UE may receive a RRC release message during the IMS call setup procedure, the RRC release message indicating a set of frequencies each associated with a RAN, where each frequency of the set of frequencies is assigned a priority. The operations of 1015 may be performed according to the methods described herein. In some examples, aspects of the operations of 1015 may be performed by a RRC message receiver as described with reference to FIGs. 5 through 8.

At 1020, the UE may determine that the UE is configured with a subscriber identity module card associated with the first operator, the first operator associated with the second RAN, the second operator associated with a third RAN. The operations of 1020 may be performed according to the methods described herein. In some examples, aspects of the operations of 1020 may be performed by a SIM card manager as described with reference to FIGs. 5 through 8.

At 1025, the UE may re-assign one or more of the assigned priorities associated with one or more frequencies of the set of frequencies. The operations of 1025 may be performed according to the methods described herein. In some examples, aspects of the operations of 1025 may be performed by a priority manager as described with reference to FIGs. 5 through 8.

At 1030, the UE may establish a connection with a second RAN based on the re-assigned one or more priorities. The operations of 1030 may be performed according to the methods described herein. In some examples, aspects of the operations of 1030 may be performed by a second RAN connection manager as described with reference to FIGs. 5 through 8.

FIG. 11 shows a flowchart illustrating a method 1100 that supports techniques for re-ordering RAN priorities in accordance with aspects of the present disclosure. The operations of method 1100 may be implemented by a UE 115 or its components as described herein. For example, the operations of method 1100 may be performed by a communications manager as described with reference to FIGs. 5 through 8. In some examples, a UE may execute a set of instructions to control the functional elements of the UE to perform the functions described below. Additionally or alternatively, a UE may perform aspects of the functions described below using special-purpose hardware.

At 1105, the UE may establish a connection with a first RAN, the first RAN associated with a first operator and a second operator. The operations of 1105 may be performed according to the methods described herein. In some examples, aspects of the operations of 1105 may be performed by a first RAN connection manager as described with reference to FIGs. 5 through 8.

At 1110, the UE may transmit, to the first RAN, a request to setup an IMS call as part of an IMS call setup procedure. The operations of 1110 may be performed according to the methods described herein. In some examples, aspects of the operations of 1110 may be performed by an IMS call request manager as described with reference to FIGs. 5 through 8.

At 1115, the UE may receive a RRC release message during the IMS call setup procedure, the RRC release message indicating a set of frequencies each associated with a RAN, where each frequency of the set of frequencies is assigned a priority. The operations of 1115 may be performed according to the methods described herein. In some examples, aspects of the operations of 1115 may be performed by a RRC message receiver as described with reference to FIGs. 5 through 8.

At 1120, the UE may re-assign one or more of the assigned priorities associated with one or more frequencies of the set of frequencies. The operations of 1120 may be performed according to the methods described herein. In some examples, aspects of the operations of 1120 may be performed by a priority manager as described with reference to FIGs. 5 through 8.

At 1125, the UE may establish a connection with a second RAN based on the re-assigned one or more priorities. The operations of 1125 may be performed according to the methods described herein. In some examples, aspects of the operations of 1125 may be performed by a second RAN connection manager as described with reference to FIGs. 5 through 8.

At 1130, the UE may perform the requested IMS call via the second RAN based on establishing the connection with the second RAN. The operations of 1130 may be performed according to the methods described herein. In some examples, aspects of the operations of 1130 may be performed by an IMS call manager as described with reference to FIGs. 5 through 8.

It should be noted that the methods described herein describe possible implementations, and that the operations and the steps may be rearranged or otherwise modified and that other implementations are possible. Further, aspects from two or more of the methods may be combined.

Although aspects of an LTE, LTE-A, LTE-A Pro, or NR system may be described for purposes of example, and LTE, LTE-A, LTE-A Pro, or NR terminology may be used in much of the description, the techniques described herein are applicable beyond LTE, LTE-A, LTE-A Pro, or NR networks. For example, the described techniques may be applicable to various other wireless communications systems such as Ultra Mobile Broadband (UMB) , Institute of Electrical and Electronics Engineers (IEEE) 802.11 (Wi-Fi) , IEEE 802.16 (WiMAX) , IEEE 802.20, Flash-OFDM, as well as other systems and radio technologies not explicitly mentioned herein.

Information and signals described herein may be represented using any of a variety of different technologies and techniques. For example, data, instructions, commands, information, signals, bits, symbols, and chips that may be referenced throughout the description may be represented by voltages, currents, electromagnetic waves, magnetic fields or particles, optical fields or particles, or any combination thereof.

The various illustrative blocks and components described in connection with the disclosure herein may be implemented or performed with a general-purpose processor, a DSP, an ASIC, a CPU, an 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, but in the alternative, the processor may be any processor, controller, microcontroller, or state machine. A processor may also be implemented as a combination of computing devices (e.g., a combination of a DSP and a microprocessor, multiple microprocessors, one or more microprocessors in conjunction with a DSP core, or any other such configuration) .

The functions described herein may be implemented in hardware, software executed by a processor, firmware, or any combination thereof. If implemented in software executed by a processor, the functions may be stored on or transmitted over as one or more instructions or code on a computer-readable medium. Other examples and implementations are within the scope of the disclosure and appended claims. For example, due to the nature of software, functions described herein may be implemented using software executed by a processor, hardware, firmware, hardwiring, or combinations of any of these. Features implementing functions may also be physically located at various positions, including being distributed such that portions of functions are implemented at different physical locations.

Computer-readable media includes both non-transitory computer storage media and communication media including any medium that facilitates transfer of a computer program from one place to another. A non-transitory storage medium may be any available medium that may be accessed by a general-purpose or special-purpose computer. By way of example, and not limitation, non-transitory computer-readable media may include RAM, ROM, electrically erasable programmable ROM (EEPROM) , flash memory, compact disk (CD) ROM or other optical disk storage, magnetic disk storage or other magnetic storage devices, or any other non-transitory medium that may be used to carry or store desired program code means in the form of instructions or data structures and that may be accessed by a general-purpose or special-purpose computer, or a general-purpose or special-purpose processor. Also, any connection is properly termed a computer-readable medium. For example, if the software is transmitted from a website, server, or other remote source using a coaxial cable, fiber optic cable, twisted pair, digital subscriber line (DSL) , or wireless technologies such as infrared, radio, and microwave, then the coaxial cable, fiber optic cable, twisted pair, DSL, or wireless technologies such as infrared, radio, and microwave are included in the definition of computer-readable medium. Disk and disc, as used herein, include CD, laser disc, optical disc, digital versatile disc (DVD) , floppy disk and Blu-ray disc where disks usually reproduce data magnetically, while discs reproduce data optically with lasers. Combinations of the above are also included within the scope of computer-readable media.

As used herein, including in the claims, “or” as used in a list of items (e.g., a list of items prefaced by a phrase such as “at least one of” or “one or more of” ) indicates an inclusive list such that, for example, a list of at least one of A, B, or C means A or B or C or AB or AC or BC or ABC (i.e., A and B and C) . Also, as used herein, the phrase “based on” shall not be construed as a reference to a closed set of conditions. For example, an example step that is described as “based on condition A” may be based on both a condition A and a condition B without departing from the scope of the present disclosure. In other words, as used herein, the phrase “based on” shall be construed in the same manner as the phrase “based at least in part on. ”

In the appended figures, similar components or features may have the same reference label. Further, various components of the same type may be distinguished by following the reference label by a dash and a second label that distinguishes among the similar components. If just the first reference label is used in the specification, the description is applicable to any one of the similar components having the same first reference label irrespective of the second reference label, or other subsequent reference label.

The description set forth herein, in connection with the appended drawings, describes example configurations and does not represent all the examples that may be implemented or that are within the scope of the claims. The term “example” used herein means “serving as an example, instance, or illustration, ” and not “preferred” or “advantageous over other examples. ” The detailed description includes specific details for the purpose of providing an understanding of the described techniques. These techniques, however, may be practiced without these specific details. In some instances, known structures and devices are shown in block diagram form in order to avoid obscuring the concepts of the described examples.

The description herein is provided to enable a person having ordinary skill in the art to make or use the disclosure. Various modifications to the disclosure will be apparent to a person having ordinary skill in the art, and the generic principles defined herein may be applied to other variations without departing from the scope of the disclosure. Thus, the disclosure is not limited to the examples and designs described herein, but is to be accorded the broadest scope consistent with the principles and novel features disclosed herein.

Claims

A method for wireless communications at a user equipment (UE) , comprising:

establishing a connection with a first radio access network, the first radio access network associated with a first operator and a second operator;

transmitting, to the first radio access network, a request to setup an internet protocol multimedia subsystem call as part of an internet protocol multimedia subsystem call setup procedure;

receiving a radio resource control release message during the internet protocol multimedia subsystem call setup procedure, the radio resource control release message indicating a plurality of frequencies each associated with a radio access network, wherein each frequency of the plurality of frequencies is assigned a priority;

re-assigning one or more of the assigned priorities associated with one or more frequencies of the plurality of frequencies; and

establishing a connection with a second radio access network based at least in part on the re-assigned one or more priorities.
The method of claim 1, further comprising:

determining that the UE is configured with a subscriber identity module card associated with the first operator, the first operator associated with the second radio access network, the second operator associated with a third radio access network.
The method of claim 2, wherein re-assigning the one or more of the assigned priorities further comprises:

re-assigning the second radio access network with a higher priority than the first radio access network based at least in part on determining that the UE is configured with a subscriber identity module card associated with the first operator.
The method of claim 2, wherein re-assigning the one or more of the assigned priorities further comprises:

removing the priority associated with the third radio access network based at least in part on determining that the UE is configured with a subscriber identity module card associated with the first operator.
The method of claim 2, wherein re-assigning the one or more of the assigned priorities further comprises:

re-assigning the third radio access network with a lower priority than the first radio access network, or the second radio access network, or both based at least in part on determining that the UE is configured with a subscriber identity module card associated with the first operator.
The method of claim 1, further comprising:

performing the requested internet protocol multimedia subsystem call via the second radio access network based at least in part on establishing the connection with the second radio access network.
The method of claim 6, further comprising:

re-establishing the connection with the first radio access network based at least in part on completing the performance of the requested internet protocol multimedia subsystem call.
The method of claim 1, further comprising:

determining, while connected with the second radio access network, whether the second radio access network or the first radio access network provides a stronger connection to the UE.
The method of claim 8, further comprising:

remaining connected to the second radio access network following the requested internet protocol multimedia subsystem call based at least in part on determining that the second radio access network provides the UE with the stronger connection.
The method of claim 9, wherein:

remaining connected to the second radio access network is based on the UE leaving a coverage area served by the first radio access network.
The method of claim 8, further comprising:

re-establishing the connection with the first radio access network following the requested internet protocol multimedia subsystem call based at least in part on determining that the first radio access network provides the UE with the stronger connection.
The method of claim 1, wherein the first operator is associated with a first set of public land mobile networks, the second operator is associated with a second set of public land mobile networks, and the first radio access network is associated with the first set of public land mobile networks and the second set of public land mobile networks.
An apparatus for wireless communications at a user equipment (UE) , comprising:

a processor,

memory coupled with the processor; and

instructions stored in the memory and executable by the processor to cause the apparatus to:

establish a connection with a first radio access network, the first radio access network associated with a first operator and a second operator;

transmit, to the first radio access network, a request to setup an internet protocol multimedia subsystem call as part of an internet protocol multimedia subsystem call setup procedure;

receive a radio resource control release message during the internet protocol multimedia subsystem call setup procedure, the radio resource control release message indicating a plurality of frequencies each associated with a radio access network, wherein each frequency of the plurality of frequencies is assigned a priority;

re-assign one or more of the assigned priorities associated with one or more frequencies of the plurality of frequencies; and

establish a connection with a second radio access network based at least in part on the re-assigned one or more priorities.
The apparatus of claim 13, wherein the instructions are further executable by the processor to cause the apparatus to:

determine that the UE is configured with a subscriber identity module card associated with the first operator, the first operator associated with the second radio access network, the second operator associated with a third radio access network.
The apparatus of claim 14, wherein the instructions to re-assign the one or more of the assigned priorities further are executable by the processor to cause the apparatus to:

re-assign the second radio access network with a higher priority than the first radio access network based at least in part on determining that the UE is configured with a subscriber identity module card associated with the first operator.
The apparatus of claim 14, wherein the instructions to re-assign the one or more of the assigned priorities further are executable by the processor to cause the apparatus to:

remove the priority associated with the third radio access network based at least in part on determining that the UE is configured with a subscriber identity module card associated with the first operator.
The apparatus of claim 14, wherein the instructions to re-assign the one or more of the assigned priorities further are executable by the processor to cause the apparatus to:

re-assign the third radio access network with a lower priority than the first radio access network, or the second radio access network, or both based at least in part on determining that the UE is configured with a subscriber identity module card associated with the first operator.
The apparatus of claim 13, wherein the instructions are further executable by the processor to cause the apparatus to:

perform the requested internet protocol multimedia subsystem call via the second radio access network based at least in part on establishing the connection with the second radio access network.
The apparatus of claim 18, wherein the instructions are further executable by the processor to cause the apparatus to:

re-establish the connection with the first radio access network based at least in part on completing the performance of the requested internet protocol multimedia subsystem call.
The apparatus of claim 13, wherein the instructions are further executable by the processor to cause the apparatus to:

determine, while connected with the second radio access network, whether the second radio access network or the first radio access network provides a stronger connection to the UE.
The apparatus of claim 20, wherein the instructions are further executable by the processor to cause the apparatus to:

remain connected to the second radio access network following the requested internet protocol multimedia subsystem call based at least in part on determining that the second radio access network provides the UE with the stronger connection.
The apparatus of claim 21, wherein remaining connected to the second radio access network is based on the UE leaving a coverage area served by the first radio access network.
The apparatus of claim 20, wherein the instructions are further executable by the processor to cause the apparatus to:

re-establish the connection with the first radio access network following the requested internet protocol multimedia subsystem call based at least in part on determining that the first radio access network provides the UE with the stronger connection.
The apparatus of claim 13, wherein the first operator is associated with a first set of public land mobile networks, the second operator is associated with a second set of public land mobile networks, and the first radio access network is associated with the first set of public land mobile networks and the second set of public land mobile networks.
An apparatus for wireless communications at a user equipment (UE) , comprising:

means for establishing a connection with a first radio access network, the first radio access network associated with a first operator and a second operator;

means for transmitting, to the first radio access network, a request to setup an internet protocol multimedia subsystem call as part of an internet protocol multimedia subsystem call setup procedure;

means for receiving a radio resource control release message during the internet protocol multimedia subsystem call setup procedure, the radio resource control release message indicating a plurality of frequencies each associated with a radio access network, wherein each frequency of the plurality of frequencies is assigned a priority;

means for re-assigning one or more of the assigned priorities associated with one or more frequencies of the plurality of frequencies; and

means for establishing a connection with a second radio access network based at least in part on the re-assigned one or more priorities.
The apparatus of claim 25, further comprising:

means for determining that the UE is configured with a subscriber identity module card associated with the first operator, the first operator associated with the second radio access network, the second operator associated with a third radio access network.
The apparatus of claim 26, wherein the means for re-assigning the one or more of the assigned priorities further comprises:

means for re-assigning the second radio access network with a higher priority than the first radio access network based at least in part on determining that the UE is configured with a subscriber identity module card associated with the first operator.
The apparatus of claim 26, wherein the means for re-assigning the one or more of the assigned priorities further comprises:

means for removing the priority associated with the third radio access network based at least in part on determining that the UE is configured with a subscriber identity module card associated with the first operator.
The apparatus of claim 26, wherein the means for re-assigning the one or more of the assigned priorities further comprises:

means for re-assigning the third radio access network with a lower priority than the first radio access network, or the second radio access network, or both based at least in part on determining that the UE is configured with a subscriber identity module card associated with the first operator.
The apparatus of claim 25, further comprising:

means for performing the requested internet protocol multimedia subsystem call via the second radio access network based at least in part on establishing the connection with the second radio access network.
The apparatus of claim 30, further comprising:

means for re-establishing the connection with the first radio access network based at least in part on completing the performance of the requested internet protocol multimedia subsystem call.
The apparatus of claim 25, further comprising:

means for determining, while connected with the second radio access network, whether the second radio access network or the first radio access network provides a stronger connection to the UE.
The apparatus of claim 32, further comprising:

means for remaining connected to the second radio access network following the requested internet protocol multimedia subsystem call based at least in part on determining that the second radio access network provides the UE with the stronger connection.
The apparatus of claim 33, wherein remaining connected to the second radio access network is based on the UE leaving a coverage area served by the first radio access network.
The apparatus of claim 32, further comprising:

means for re-establishing the connection with the first radio access network following the requested internet protocol multimedia subsystem call based at least in part on determining that the first radio access network provides the UE with the stronger connection.
The apparatus of claim 25, wherein the first operator is associated with a first set of public land mobile networks, the second operator is associated with a second set of public land mobile networks, and the first radio access network is associated with the first set of public land mobile networks and the second set of public land mobile networks.
A non-transitory computer-readable medium storing code for wireless communications at a user equipment (UE) , the code comprising instructions executable by a processor to:

establish a connection with a first radio access network, the first radio access network associated with a first operator and a second operator;

transmit, to the first radio access network, a request to setup an internet protocol multimedia subsystem call as part of an internet protocol multimedia subsystem call setup procedure;

receive a radio resource control release message during the internet protocol multimedia subsystem call setup procedure, the radio resource control release message indicating a plurality of frequencies each associated with a radio access network, wherein each frequency of the plurality of frequencies is assigned a priority;

re-assign one or more of the assigned priorities associated with one or more frequencies of the plurality of frequencies; and

establish a connection with a second radio access network based at least in part on the re-assigned one or more priorities.
The non-transitory computer-readable medium of claim 37, wherein the instructions are further executable to:

determine that the UE is configured with a subscriber identity module card associated with the first operator, the first operator associated with the second radio access network, the second operator associated with a third radio access network.
The non-transitory computer-readable medium of claim 38, wherein the instructions to re-assign the one or more of the assigned priorities further are executable to:

re-assign the second radio access network with a higher priority than the first radio access network based at least in part on determining that the UE is configured with a subscriber identity module card associated with the first operator.
The non-transitory computer-readable medium of claim 38, wherein the instructions to re-assign the one or more of the assigned priorities further are executable to:

remove the priority associated with the third radio access network based at least in part on determining that the UE is configured with a subscriber identity module card associated with the first operator.
The non-transitory computer-readable medium of claim 38, wherein the instructions to re-assign the one or more of the assigned priorities further are executable to:

re-assign the third radio access network with a lower priority than the first radio access network, or the second radio access network, or both based at least in part on determining that the UE is configured with a subscriber identity module card associated with the first operator.
The non-transitory computer-readable medium of claim 37, wherein the instructions are further executable to:

perform the requested internet protocol multimedia subsystem call via the second radio access network based at least in part on establishing the connection with the second radio access network.
The non-transitory computer-readable medium of claim 42, wherein the instructions are further executable to:

re-establish the connection with the first radio access network based at least in part on completing the performance of the requested internet protocol multimedia subsystem call.
The non-transitory computer-readable medium of claim 37, wherein the instructions are further executable to:

determine, while connected with the second radio access network, whether the second radio access network or the first radio access network provides a stronger connection to the UE.
The non-transitory computer-readable medium of claim 44, wherein the instructions are further executable to:

remain connected to the second radio access network following the requested internet protocol multimedia subsystem call based at least in part on determining that the second radio access network provides the UE with the stronger connection.
The non-transitory computer-readable medium of claim 45, wherein remaining connected to the second radio access network is based on the UE leaving a coverage area served by the first radio access network.
The non-transitory computer-readable medium of claim 44, wherein the instructions are further executable to:

re-establish the connection with the first radio access network following the requested internet protocol multimedia subsystem call based at least in part on determining that the first radio access network provides the UE with the stronger connection.
The non-transitory computer-readable medium of claim 37, wherein the first operator is associated with a first set of public land mobile networks, the second operator is associated with a second set of public land mobile networks, and the first radio access network is associated with the first set of public land mobile networks and the second set of public land mobile networks.