Ping-pong handover or redirection detection and avoidance

Abstract

Aspects of the present disclosure generally relate to wireless communications. In some aspects, a user equipment (UE) may compare an external list of ping-pong handover or redirection maintained by an access point with an internal list of ping-pong handover or redirection maintained by the UE. The UE may indicate a previous ping-pong handover or redirection between a first network node and a second network node based at least in part on the external list indicating a previous ping-pong handover or redirection between the first network node and the second network node and the internal list indicating a previous ping-pong handover or redirection between the first network node and the second network node, both the external list and the internal list indicate a previous ping-pong handover or redirection between the first network node and the second network node, or both the external list and the internal list do not indicate a previous ping-pong handover or redirection between the first network node and the second network node, a ping-pong detection criterion is identified for a handover or redirection between the first network node and the second network node. Numerous other aspects are described.

Description

Technical Field

[0001] Aspects of the present disclosure relate generally to wireless communications, and to techniques and apparatus for ping-pong handover or redirection detection and avoidance. Background Art

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

[0003] A wireless network may include one or more base stations that support communications for a user equipment (UE) or multiple UEs. A UE may communicate with a base station via downlink communications and uplink communications. A "downlink" (or "DL") refers to the communication link from a base station to a UE, and an "uplink" (or "UL") refers to the communication link from a UE to a base station.

[0004] The above-mentioned multiple access technologies have been adopted in various telecommunication standards to provide a common protocol that enables different UEs to communicate at a city, country, region and / or global level. New Radio (NR) (which may be 5G) is a set of enhancements to the LTE mobile standard promulgated by 3GPP. NR is designed to better integrate with other open standards by improving spectrum efficiency, reducing costs, improving services, utilizing new spectrum, and using orthogonal frequency division multiplexing (OFDM) (CP-OFDM) with cyclic prefix (CP) on the downlink, using CP-OFDM and / or single carrier frequency division multiplexing (SC-FDM) (also known as discrete Fourier transform spread OFDM (DFT-s-OFDM)) on the uplink, and supporting beamforming, multiple input multiple output (MIMO) antenna technology and carrier aggregation, so as to better support mobile broadband Internet access. As the demand for mobile broadband access continues to increase, further improvements in LTE, NR and other radio access technologies remain useful. Summary of the invention

[0005] Some aspects described herein relate to a method of wireless communication performed by a user equipment (UE). The method may include comparing an external list of ping-pong handovers or redirections maintained by an access point and an internal list of ping-pong handovers or redirections maintained by the UE. The method may include identifying a ping-pong detection criterion for a handover or redirection between a first network node and a second network node based at least in part on the external list indicating a previous ping-pong handover or redirection between a first network node and a second network node, the internal list indicating a previous ping-pong handover or redirection between the first network node and the second network node, the external list and the internal list both indicating a previous ping-pong handover or redirection between the first network node and the second network node, or neither the external list nor the internal list indicating a previous ping-pong handover or redirection between the first network node and the second network node.

[0006] Some aspects described herein relate to a method of wireless communication performed by a UE. The method may include obtaining a configuration indicating one or more measurement conditions associated with a reporting event. The method may include obtaining an indication that the reporting event is associated with a handover or redirection between a first network node and a second network node. The method may include obtaining an indication that the handover or redirection between the first network node and the second network node is a ping-pong handover or redirection. The method may include applying one or more other measurement conditions to avoid the ping-pong handover or redirection.

[0007] Some aspects described herein relate to an apparatus for wireless communication performed by a UE. The apparatus may include a memory and one or more processors coupled to the memory. The one or more processors may be configured to compare an external list of ping-pong switches or redirections maintained by an access point and an internal list of ping-pong switches or redirections maintained by the UE. The one or more processors may be configured to identify a ping-pong detection criterion for a switch or redirection between a first network node and a second network node based at least in part on the external list indicating a previous ping-pong switch or redirection between a first network node and a second network node, the internal list indicating a previous ping-pong switch or redirection between the first network node and the second network node, the external list and the internal list both indicating a previous ping-pong switch or redirection between the first network node and the second network node, or neither the external list nor the internal list indicating a previous ping-pong switch or redirection between the first network node and the second network node.

[0008] Some aspects described herein relate to an apparatus for wireless communication performed by a UE. The apparatus may include a memory and one or more processors coupled to the memory. The one or more processors may be configured to obtain a configuration indicating one or more measurement conditions associated with a reporting event. The one or more processors may be configured to obtain an indication that the reporting event is associated with a handover or redirection between a first network node and a second network node. The one or more processors may be configured to obtain an indication that the handover or redirection between the first network node and the second network node is a ping-pong handover or redirection. The one or more processors may be configured to apply one or more other measurement conditions to avoid a ping-pong handover or redirection.

[0009] Some aspects described herein relate to a non-transitory computer-readable medium storing an instruction set for wireless communication by a UE. The instruction set, when executed by one or more processors of the UE, may cause the UE to compare an external list of ping-pong handovers or redirections maintained by an access point and an internal list of ping-pong handovers or redirections maintained by the UE. The instruction set, when executed by one or more processors of the UE, may cause the UE to identify a ping-pong detection criterion for a handover or redirection between a first network node and a second network node based at least in part on the external list indicating a previous ping-pong handover or redirection between a first network node and a second network node, the internal list indicating a previous ping-pong handover or redirection between the first network node and the second network node, the external list and the internal list both indicating a previous ping-pong handover or redirection between the first network node and the second network node, or neither the external list nor the internal list indicating a previous ping-pong handover or redirection between the first network node and the second network node.

[0010] Some aspects described herein relate to a non-transitory computer-readable medium storing an instruction set for wireless communication performed by a UE. The instruction set, when executed by one or more processors of the UE, may cause the UE to obtain a configuration indicating one or more measurement conditions associated with a reporting event. The instruction set, when executed by one or more processors of the UE, may cause the UE to obtain an indication that the reporting event is associated with a handover or redirection between a first network node and a second network node. The instruction set, when executed by one or more processors of the UE, may cause the UE to obtain an indication that the handover or redirection between the first network node and the second network node is a ping-pong handover or redirection. The instruction set, when executed by one or more processors of the UE, may cause the UE to apply one or more other measurement conditions to avoid a ping-pong handover or redirection.

[0011] Some aspects described herein relate to an apparatus for wireless communication. The apparatus may include means for comparing an external list of ping-pong handovers or redirections maintained by an access point and an internal list of ping-pong handovers or redirections maintained by the apparatus. The apparatus may include means for identifying a ping-pong detection criterion for a handover or redirection between a first network node and a second network node based at least in part on the external list indicating a previous ping-pong handover or redirection between the first network node and the second network node, the internal list indicating a previous ping-pong handover or redirection between the first network node and the second network node, both the external list and the internal list indicating a previous ping-pong handover or redirection between the first network node and the second network node, or neither the external list nor the internal list indicating a previous ping-pong handover or redirection between the first network node and the second network node.

[0012] Some aspects described herein relate to an apparatus for wireless communication. The apparatus may include means for obtaining a configuration indicating one or more measurement conditions associated with a reporting event. The apparatus may include means for obtaining an indication that the reporting event is associated with a handover or redirection between a first network node and a second network node. The apparatus may include means for obtaining an indication that the handover or redirection between the first network node and the second network node is a ping-pong handover or redirection. The apparatus may include means for applying one or more other measurement conditions to avoid the ping-pong handover or redirection.

[0013] Aspects generally include methods, apparatus, systems, computer program products, non-transitory computer readable media, user equipment, base stations, wireless communication devices, and / or processing systems as fully described herein with reference to and as illustrated by the accompanying drawings.

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

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

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

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

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

[0019] Figure 3 is a diagram illustrating an example of a switching procedure according to the present disclosure.

[0020] Figure 4 is a diagram illustrating an example associated with ping-pong switching or redirection detection according to the present disclosure.

[0021] Figure 5 is a diagram illustrating an example associated with ping-pong switching or redirection avoidance according to the present disclosure.

[0022] Figure 6is a diagram illustrating an example associated with ping-pong switching or redirection detection according to the present disclosure.

[0023] Figure 7 is a diagram illustrating an example associated with ping-pong switching or redirection avoidance according to the present disclosure.

[0024] Figure 8 is a diagram illustrating an example process associated with ping-pong switching or redirection detection according to the present disclosure.

[0025] Fig. 9 is a diagram illustrating an example process associated with ping-pong switching or redirection avoidance according to the present disclosure.

[0026] Fig.10 is a diagram of an example apparatus for wireless communications according to the present disclosure. DETAILED DESCRIPTION

[0027] The various aspects of the present disclosure are described more fully below with reference to the accompanying drawings. However, the present disclosure can be embodied in many different forms, and should not be construed as being limited to any specific structure or function presented throughout the present disclosure. Instead, these aspects are provided so that the present disclosure will be thorough and complete, and the protection scope of the present disclosure will be fully conveyed to those skilled in the art. It will be appreciated by those skilled in the art that the scope of the present disclosure is intended to cover any aspect of the present disclosure disclosed herein, whether it is implemented independently or in combination with any other aspect of the present disclosure. For example, any number of aspects set forth herein may be used to implement a device or practice method. In addition, the scope of the present disclosure is intended to cover such devices or methods implemented using other structures, functions, or structures and functions in addition to or different from the various aspects of the disclosure set forth herein. It should be understood that any aspect of the disclosure disclosed herein may be embodied by one or more elements of the present invention.

[0028] Several aspects of telecommunication systems will now be presented with reference to various devices and techniques. These devices and techniques will be described in the following detailed description and illustrated in the accompanying drawings by various blocks, modules, components, circuits, steps, processes, algorithms, etc. (collectively referred to as "elements"). These elements can be implemented using hardware, software, or a combination thereof. Whether these elements are implemented as hardware or software depends on the specific application and the design constraints imposed on the overall system.

[0029] Although aspects may be described herein using terminology generally associated with 5G or new radio (NR) radio access technology (RAT), aspects of the present disclosure may be applied to other RATs, such as 3G RAT, 4G RAT, and / or post-5G RATs (e.g., 6G).

[0030] Figure 1 1 is a diagram illustrating an example of a wireless network 100 according to the present disclosure. The wireless network 100 may be or may include elements of a 5G (e.g., NR) network and / or a 4G (e.g., Long Term Evolution (LTE)) network, etc. The wireless network 100 may include one or more base stations 110 (shown as BS110a, BS110b, BS110c, and BS110d), a user equipment (UE) 120 or multiple UEs 120 (shown as UE 120a, UE 120b, UE 120c, UE 120d, and UE 120e), and / or other network entities. The base station 110 is an entity that communicates with the UE 120. The base station 110 (sometimes referred to as a BS) may include, for example, an NR base station, an LTE base station, a Node B, an eNB (e.g., in 4G), a gNB (e.g., in 5G), an access point, and / or a transmit receive point (TRP). Each base station 110 may provide communication coverage for a specific geographic area. In the 3rd Generation Partnership Project (3GPP), the term "cell" can refer to the coverage area of ​​a base station 110 and / or a base station subsystem serving the coverage area, depending on the context in which the term is used.

[0031] The base station 110 may provide communication coverage for a macro cell, a pico cell, a femto cell, and / or another type of cell. A macro cell may cover a relatively large geographic area (e.g., a radius of several kilometers) and may allow unrestricted access by a UE 120 with a service subscription. A pico cell may cover a relatively small geographic area and may allow unrestricted access by a UE 120 with a service subscription. A femto cell may cover a relatively small geographic area (e.g., a home) and may allow restricted access by a UE 120 associated with the femto cell (e.g., a UE 120 in a closed subscriber group (CSG)). A base station 110 for a macro cell may be referred to as a macro base station. A base station 110 for a pico cell may be referred to as a pico base station. A base station 110 for a femto cell may be referred to as a femto base station or a home base station. In Figure 1 In the example shown in , BS 110a may be a macro base station for macro cell 102a, BS 110b may be a pico base station for pico cell 102b, and BS 110c may be a femto base station for femto cell 102c. A base station may support one or more (eg, three) cells.

[0032] In some aspects, the term "base station" (e.g., base station 110) or "network entity" may refer to a converged base station, a decomposed base station, an integrated access and backhaul (IAB) node, a relay node, and / or one or more components thereof. For example, in some aspects, a "base station" or "network node" may refer to a central unit (CU), a distributed unit (DU), a radio unit (RU), a near real-time (near-RT) RAN intelligent controller (RIC), or a non-real-time (non-RT) RIC, or a combination thereof. In some aspects, the term "base station" or "network entity" may refer to one device configured to perform one or more functions, such as those described herein in conjunction with base station 110. In some aspects, the term "base station" or "network node" may refer to a plurality of devices configured to perform one or more functions. For example, in some distributed systems, each of a number of different devices (which may be located in the same geographic location or in different geographic locations) may be configured to perform at least a portion of a function, or to repeat the performance of at least a portion of the function, and the term "base station" or "network node" may refer to any one or more of these different devices. In some aspects, the term "base station" or "network node" may refer to one or more virtual base stations and / or one or more virtual base station functions. For example, in some aspects, two or more base station functions may be instantiated on a single device. In some aspects, the term "base station" or "network node" may refer to one of the base station functions but not the other. In this way, a single device may include more than one base station.

[0033] In some examples, the cells may not necessarily be stationary, and the geographic area of ​​the cells may move depending on the location of the mobile base station 110 (e.g., a mobile base station). In some examples, the base stations 110 may be interconnected with each other and / or to one or more other base stations 110 or network nodes (not shown) in the wireless network 100 using any suitable transport network over various types of backhaul interfaces (such as direct physical connections or virtual networks).

[0034] The wireless network 100 may include one or more relay stations. A relay station is an entity that receives transmissions of data from an upstream station (e.g., a base station 110 or a UE 120) and transmits the transmissions of data to a downstream station (e.g., a UE 120 or a base station 110). A relay station may be a UE 120 that is capable of relaying transmissions for other UEs 120. Figure 1 In the example shown in FIG. 1 , BS 110d (eg, a relay base station) may communicate with BS 110a (eg, a macro base station) and UE 120d to facilitate communication between BS 110a and UE 120d. Base station 110 that relays communication may be referred to as a relay station, relay base station, relay, or the like.

[0035] The wireless network 100 may be a heterogeneous network that includes different types of base stations 110, such as macro base stations, pico base stations, femto base stations, relay base stations, etc. These different types of base stations 110 may have different transmit power levels, different coverage areas, and / or different impacts on interference in the wireless network 100. For example, a macro base station may have a high transmit power level (e.g., 5 watts to 40 watts), while a pico base station, a femto base station, and a relay base station may have a lower transmit power level (e.g., 0.1 watt to 2 watts).

[0036] A network controller 130 may be coupled to or in communication with a set of base stations 110 and may provide coordination and control for the base stations. The network controller 130 may communicate with the base stations 110 via a backhaul communication link. The base stations 110 may communicate directly with each other or indirectly via a wireless backhaul communication link or a wired backhaul communication link.

[0037] UE 120 may be distributed throughout wireless network 100, and each UE 120 may be stationary or mobile. UE 120 may include, for example, an access terminal, a terminal, a mobile station, and / or a subscriber unit. UE 120 may be a cellular phone (e.g., a smart phone), a personal digital assistant (PDA), a wireless modem, a wireless communication device, a handheld device, a laptop computer, a cordless phone, a wireless local loop (WLL) station, a tablet computer, a camera, a gaming device, a netbook, a smartbook, an ultrabook, a medical device, a biometric device, a wearable device (e.g., a smart watch, smart clothing, smart glasses, a smart wristband, smart jewelry (e.g., a smart ring or a smart bracelet)), an entertainment device (e.g., a music device, a video device, and / or a satellite radio), a vehicle component or sensor, a smart meter / sensor, an industrial manufacturing equipment, a global positioning system device, and / or any other suitable device configured to communicate via a wireless medium.

[0038] Some UEs 120 may be considered as machine type communication (MTC) or evolved or enhanced machine type communication (eMTC) UEs. MTC UEs and / or eMTC UEs may include, for example, robots, drones, remote devices, sensors, meters, monitors, and / or location tags, which may communicate with a base station, another device (e.g., a remote device), or some other entity. Some UEs 120 may be considered as Internet of Things (IoT) devices, and / or may be implemented as NB-IoT (narrowband IoT) devices. Some UEs 120 may be considered as customer premises equipment. UE 120 may be included inside a housing that houses components of UE 120, such as a processor component and / or a memory component. In some examples, the processor component and the memory component may be coupled together. For example, a processor component (e.g., one or more processors) and a memory component (e.g., a memory) may be operationally coupled, communicatively coupled, electronically coupled, and / or electrically coupled.

[0039] In general, any number of wireless networks 100 may be deployed in a given geographic area. Each wireless network 100 may support a specific RAT and may operate on one or more frequencies. RAT may be referred to as a radio technology, air interface, etc. Frequency may be referred to as a carrier, frequency channel, etc. Each frequency may support a single RAT in a given geographic area to avoid interference between wireless networks of different RATs. In some cases, NR or 5G RAT networks may be deployed.

[0040] In some examples, two or more UEs 120 (e.g., shown as UE 120a and UE 120e) may communicate directly using one or more side link channels (e.g., without using base station 110 as an intermediary to communicate with each other). For example, UE 120 may communicate using peer-to-peer (P2P) communication, device-to-device (D2D) communication, vehicle-to-everything (V2X) protocols (e.g., which may include vehicle-to-vehicle (V2V) protocols, vehicle-to-infrastructure (V2I) protocols, or vehicle-to-pedestrian (V2P) protocols), and / or mesh networks. In such examples, UE 120 may perform scheduling operations, resource selection operations, and / or other operations described elsewhere herein as being performed by base station 110.

[0041] The devices of the wireless network 100 may communicate using an electromagnetic spectrum, which may be subdivided into various categories, bands, channels, etc., based on frequency or wavelength. For example, the devices of the wireless network 100 may communicate using one or more operating bands. In 5G NR, two initial operating bands have been identified as frequency ranges designated FR1 (410 MHz-7.125 GHz) and FR2 (24.25 GHz-52.6 GHz). It should be understood that, although a portion of FR1 is greater than 6 GHz, FR1 is often (interchangeably) referred to as the "below 6 GHz" band in various documents and articles. A similar naming problem sometimes occurs with respect to FR2, which is often (interchangeably) referred to as the "millimeter wave" band in documents and articles, although different from the extremely high frequency (EHF) band (30 GHz-300 GHz) identified as the "millimeter wave" band by the International Telecommunication Union (ITU).

[0042] Frequencies between FR1 and FR2 are generally referred to as mid-band frequencies. Recent 5G NR research has identified the operating bands for these mid-band frequencies as frequency range designation FR3 (7.125GHz-24.25GHz). The bands falling within FR3 can inherit FR1 characteristics and / or FR2 characteristics, so the features of FR1 and / or FR2 can be effectively extended to mid-band frequencies. In addition, higher frequency bands are currently being explored to extend 5G NR operations to more than 52.6GHz. For example, three higher operating bands have been identified as frequency range designations FR4a or FR4-1 (52.6GHz-71 GHz), FR4 (52.6GHz-114.25GHz) and FR5 (114.25GHz-300GHz). Each of these higher frequency bands falls within the EHF band.

[0043] With the above examples in mind, unless otherwise specifically stated, it should be understood that the terms "below 6 GHz," etc., if used herein, may broadly refer to frequencies that may be below 6 GHz, may be within FR1, or may include mid-band frequencies. Additionally, unless otherwise specifically stated, it should be understood that the terms "millimeter wave," etc., if used herein, may broadly refer to frequencies that may include mid-band frequencies, may be within FR2, FR4, FR4-a or FR4-1, and / or FR5, or may be within the EHF band. It is contemplated that the frequencies included in these operating bands (e.g., FR1, FR2, FR3, FR4, FR4-a, FR4-1, and / or FR5) may be modified, and the techniques described herein are applicable to those modified frequency ranges.

[0044] In some aspects, UE 120 may include communication manager 140. As described in more detail elsewhere herein, communication manager 140 may compare an external list of ping-pong handovers or redirections maintained by an access point and an internal list of ping-pong handovers or redirections maintained by the UE; and identify a ping-pong detection criterion for a handover or redirection between the first network node and the second network node based at least in part on the external list indicating a previous ping-pong handover or redirection between the first network node and the second network node, the internal list indicating a previous ping-pong handover or redirection between the first network node and the second network node, both the external list and the internal list indicating a previous ping-pong handover or redirection between the first network node and the second network node, or neither the external list nor the internal list indicating a previous ping-pong handover or redirection between the first network node and the second network node. Additionally or alternatively, communication manager 140 may perform one or more other operations described herein.

[0045] In some aspects, the communication manager 140 may obtain a configuration indicating one or more measurement conditions associated with the reporting event; obtain an indication that the reporting event is associated with a handover or redirection between the first network node and the second network node; obtain an indication that the handover or redirection between the first network node and the second network node is a ping-pong handover or redirection; and apply one or more other measurement conditions to avoid the ping-pong handover or redirection. Additionally or alternatively, the communication manager 140 may perform one or more other operations described herein.

[0046] As indicated above, Figure 1 Other examples can be found in the Figure 1 Different than described.

[0047] Figure 2 2 is a diagram illustrating an example 200 of base station 110 communicating with UE 120 in wireless network 100 according to the present disclosure. Base station 110 may be equipped with a set of antennas 234a to 234t, such as T antennas (T≥1). UE 120 may be equipped with a set of antennas 252a to 252r, such as R antennas (R≥1).

[0048] At the base station 110, the transmit processor 220 may receive data intended for the UE 120 (or a set of UEs 120) from the data source 212. The transmit processor 220 may select one or more modulation and coding schemes (MCS) for the UE 120 based at least in part on one or more channel quality indicators (CQI) received from the UE 120. The base station 110 may process (e.g., encode and modulate) the data for the UE 120 based at least in part on the MCS selected for the UE 120, and may provide data symbols for the UE 120. The transmit processor 220 may process system information (e.g., for semi-static resource allocation information (SRPI)) and control information (e.g., CQI requests, grants, and / or upper layer signaling), and provide overhead symbols and control symbols. The transmit processor 220 may generate reference symbols for reference signals (e.g., cell-specific reference signals (CRS) or demodulation reference signals (DMRS)) and synchronization signals (e.g., primary synchronization signals (PSS) or secondary synchronization signals (SSS)). The transmit (TX) multiple-input multiple-output (MIMO) processor 230 may perform spatial processing (e.g., pre-decoding) on ​​data symbols, control symbols, overhead symbols, and / or reference symbols, where applicable, and may provide a set of output symbol streams (e.g., T output symbol streams) to a corresponding set of modems 232 (e.g., T modems) (shown as modems 232a to 232t). For example, each output symbol stream may be provided to a modulator component (shown as MOD) of the modem 232. Each modem 232 may process a corresponding output symbol stream (e.g., for OFDM) using a corresponding modulator component to obtain an output sample stream. Each modem 232 may further process (e.g., convert to analog, amplify, filter, and / or up-convert) the output sample stream using a corresponding modulator component to obtain a downlink signal. The modems 232a to 232t may transmit a set of downlink signals (e.g., T downlink signals) via a corresponding set of antennas 234 (e.g., T antennas) (shown as antennas 234a to 234t).

[0049] At the UE 120, a set of antennas 252 (shown as antennas 252a to 252r) may receive downlink signals from the base station 110 and / or other base stations 110 and may provide a set of received signals (e.g., R received signals) to a set of modems 254 (e.g., R modems) (shown as modems 254a to 254r). For example, each received signal may be provided to a demodulator component (shown as DEMOD) of the modem 254. Each modem 254 may use a corresponding demodulator component to condition (e.g., filter, amplify, downconvert, and / or digitize) the received signal to obtain input samples. Each modem 254 may use a demodulator component to further process the input samples (e.g., for OFDM) to obtain received symbols. A MIMO detector 256 may obtain received symbols from the modem 254, may perform MIMO detection on the received symbols where applicable, and may provide detected symbols. The receive processor 258 may process (e.g., demodulate and decode) the detected symbols, may provide decoded data for the UE 120 to the data sink 260, and may provide decoded control information and system information to the controller / processor 280. The term "controller / processor" may refer to one or more controllers, one or more processors, or a combination thereof. The channel processor may determine a reference signal received power (RSRP) parameter, a received signal strength indicator (RSSI) parameter, a reference signal received quality (RSRQ) parameter, and / or a CQI parameter, among other things. In some examples, one or more components of the UE 120 may be included in the housing 284.

[0050] The network controller 130 may include a communication unit 294, a controller / processor 290, and a memory 292. The network controller 130 may include, for example, one or more devices in a core network. The network controller 130 may communicate with the base station 110 via the communication unit 294.

[0051] One or more antennas (e.g., antennas 234a to 234t and / or antennas 252a to 252r) may include or be included within one or more antenna panels, one or more antenna groups, one or more sets of antenna elements, and / or one or more antenna arrays, etc. Antenna panels, antenna groups, sets of antenna elements, and / or antenna arrays may include one or more antenna elements (in a single housing or multiple housings), sets of coplanar antenna elements, sets of non-coplanar antenna elements, and / or be coupled to one or more transmit and / or receive components (such as, Figure 2 One or more antenna elements of one or more components in.

[0052] On the uplink, at the UE 120, a transmit processor 264 may receive and process data from a data source 262 and control information from a controller / processor 280 (e.g., for reports including RSRP, RSSI, RSRQ, and / or CQI). The transmit processor 264 may generate reference symbols for one or more reference signals. The symbols from the transmit processor 264 may be pre-decoded by the TX MIMO processor 266, where applicable, further processed by the modem 254 (e.g., for DFT-s-OFDM or CP-OFDM), and transmitted to the base station 110. In some examples, the modem 254 of the UE 120 may include a modulator and a demodulator. In some examples, the UE 120 includes a transceiver. The transceiver may include any combination of an antenna 252, a modem 254, a MIMO detector 256, a receive processor 258, a transmit processor 264, and / or a TX MIMO processor 266. The transceiver may be used by a processor (eg, controller / processor 280) and memory 282 to perform the functions described herein (eg, with reference to Figures 4 to 10 ) or any aspects of any of the methods described herein.

[0053] At the base station 110, uplink signals from the UE 120 and / or other UEs may be received by the antenna 234, processed by the modem 232 (e.g., a demodulator component of the modem 232 shown as DEMOD), detected by the MIMO detector 236 (if applicable), and further processed by the receive processor 238 to obtain decoded data and control information transmitted by the UE 120. The receive processor 238 may provide the decoded data to the data sink 239 and the decoded control information to the controller / processor 240. The base station 110 may include a communication unit 244 and may communicate with the network controller 130 via the communication unit 244. The base station 110 may include a scheduler 246 to schedule one or more UEs 120 for downlink and / or uplink communications. In some examples, the modem 232 of the base station 110 may include a modulator and a demodulator. In some examples, the base station 110 includes a transceiver. The transceiver may include any combination of antenna 234, modem 232, MIMO detector 236, receive processor 238, transmit processor 220, and / or TX MIMO processor 230. The transceiver may be used by a processor (e.g., controller / processor 240) and memory 242 to perform operations described herein (e.g., with reference to Figures 4 to 10 ) or any aspects of any of the methods described herein.

[0054] The controller / processor 240 of the base station 110, the controller / processor 280 of the UE 120, and / or Figure 2 Any other components of the controller / processor 240 of the base station 110, the controller / processor 280 of the UE 120, and / or Figure 2 Any other component of the Figure 8 The process of 800 Fig. 9 900 and / or operations of other processes as described herein. Memory 242 and memory 282 may store data and program codes for base station 110 and UE 120, respectively. In some examples, memory 242 and / or memory 282 may include a non-transitory computer-readable medium that stores one or more instructions (e.g., code and / or program code) for wireless communication. For example, the one or more instructions, when executed by one or more processors of base station 110 and / or UE 120 (e.g., directly executed, or executed after compilation, conversion, and / or interpretation), may cause the one or more processors, UE 120, and / or base station 110 to perform or direct, for example, Figure 8 The process of 800 Fig. 9 The process 900 and / or operations of other processes as described herein. In some examples, executing instructions may include running instructions, converting instructions, compiling instructions, and / or interpreting instructions, among others.

[0055] In some aspects, UE 120 includes means for comparing (e.g., using controller / processor 280, memory 282, etc.) an external list of ping-pong handovers or redirections maintained by the access point and an internal list of ping-pong handovers or redirections maintained by the UE; and / or means for identifying (e.g., using controller / processor 280, memory 282, etc.) a ping-pong detection criterion for a handover or redirection between the first network node and the second network node based at least in part on the external list indicating a previous ping-pong handover or redirection between the first network node and the second network node, the internal list indicating a previous ping-pong handover or redirection between the first network node and the second network node, both the external list and the internal list indicating a previous ping-pong handover or redirection between the first network node and the second network node, or neither the external list nor the internal list indicating a previous ping-pong handover or redirection between the first network node and the second network node. Means for UE 120 to perform operations described herein may include, for example, one or more of communications manager 140, antenna 252, modem 254, MIMO detector 256, receive processor 258, transmit processor 264, TX MIMO processor 266, controller / processor 280, or memory 282.

[0056] In some aspects, UE 120 includes means for obtaining (e.g., using antenna 252, modem 254, MIMO detector 256, receive processor 258, controller / processor 280, memory 282, etc.) a configuration indicating one or more measurement conditions associated with a reporting event; means for obtaining (e.g., using antenna 252, modem 254, MIMO detector 256, receive processor 258, controller / processor 280, memory 282, etc.) an indication that the reporting event is associated with a handover or redirection between a first network node and a second network node; means for obtaining (e.g., using antenna 252, modem 254, MIMO detector 256, receive processor 258, controller / processor 280, memory 282, etc.) an indication that the handover or redirection between the first network node and the second network node is a ping-pong handover or redirection; means for applying (e.g., using controller / processor 280, memory 282, etc.) one or more other measurement conditions to avoid a ping-pong handover or redirection. Means for UE 120 to perform operations described herein may include, for example, one or more of communications manager 140, antenna 252, modem 254, MIMO detector 256, receive processor 258, transmit processor 264, TX MIMO processor 266, controller / processor 280, or memory 282.

[0057] Although Figure 2 The blocks in the 200 and 210 are illustrated as distinct components, but the functionality described above with respect to these blocks may be implemented in a single hardware, software, or combined component or in various combinations of components. For example, the functionality described with respect to the transmit processor 264, the receive processor 258, and / or the TX MIMO processor 266 may be performed by or under the control of the controller / processor 280.

[0058] As indicated above, Figure 2 Other examples can be found in the Figure 2 Different than described.

[0059] Figure 3 is a diagram illustrating an example 300 of a handover procedure according to the present disclosure.

[0060] like Figure 3As shown, the handover procedure may involve UE 305, source network node (NN) 310, target network node 315, user plane function (UPF) device 320 and access and mobility management function (AMF) device 325. UE 305 may correspond to UE 120 described elsewhere herein. Source network node 310 and / or target network node 315 may correspond to network node 110 described elsewhere herein. UPF device 320 and / or AMF device 325 may correspond to network controller 130 described elsewhere herein. UE 305 and source network node 310 may be connected via a serving cell or a source cell (e.g., may have radio resource control (RRC)), and UE 305 may experience a handover to target network node 315 via a target cell. UPF device 320 and / or AMF device 325 may be located within a core network. Source network node 310 and target network node 315 may be in communication with the core network for mobility support and user plane functions. In some cases, the handover procedure may be a make-before-break (MBB) handover procedure. In some cases, the MBB handover procedure may include an enhanced MBB (eMBB) handover procedure.

[0061] As shown, the handover procedure may include a handover preparation phase 330, a handover execution phase 335, and a handover completion phase 340. During the handover preparation phase 330, the UE 305 may report measurements that prepare the source network node 310 and / or the target network node 315 for the handover and trigger the execution of the handover. During the handover execution phase 335, the UE 305 may perform the handover by performing a random access procedure with the target network node 315 and establishing an RRC connection with the target network node 315. During the handover completion phase 340, the source network node 310 may forward stored communications associated with the UE 305 to the target network node 315, and the UE 305 may be released from the connection with the source network node 310.

[0062] As indicated by reference numeral 345, UE 305 may perform one or more measurements and may send a measurement report to source network node 310 based at least in part on performing one or more measurements (e.g., serving cell measurements and / or neighbor cell measurements). The measurement report may indicate, for example, a reference signal received power (RSRP) parameter, a reference signal received quality (RSRQ) parameter, a received signal strength indicator (RSSI) parameter, and / or a signal to interference plus noise ratio (SINR) parameter (e.g., for a serving cell and / or one or more neighbor cells). Source network node 310 may use the measurement report to determine whether to trigger a handover to target network node 315. For example, if one or more measurements satisfy a condition, source network node 310 may trigger a handover of UE 305 to target network node 315.

[0063] As indicated by reference numeral 350, source network node 310 and target network node 315 may communicate with each other to prepare for a handover of UE 305. As part of the handover preparation, source network node 310 may send a handover request to target network node 315 to instruct target network node 315 to prepare for the handover. Source network node 310 may communicate radio resource control (RRC) context information associated with UE 305 and / or configuration information associated with UE 305 to target network node 315. Target network node 315 may prepare for the handover by reserving resources for UE 305. After reserving resources, target network node 315 may send an acknowledgment (ACK) to source network node 310 in response to the handover request.

[0064] As indicated by reference numeral 355, source network node 310 may send an RRC reconfiguration message to UE 305. The RRC reconfiguration message may include a handover command instructing UE 305 to perform a handover procedure from source network node 310 to target network node 315. The handover command may include information associated with target network node 315, such as a random access channel (RACH) preamble assignment for accessing target network node 315. Receipt of the RRC reconfiguration message including the handover command by UE 305 may trigger the start of a handover execution phase 335.

[0065] As indicated by reference numeral 360, during a handover execution phase 335 of the handover, UE 305 may perform the handover by performing a random access procedure with target network node 315 (e.g., including synchronization with target network node 315) while continuing to communicate with source network node 310. For example, when UE 305 performs the random access procedure with target network node 315, UE 305 may send uplink data, uplink control information, or an uplink reference signal (e.g., a sounding reference signal) to source network node 310, and / or may receive downlink data, downlink control information, and / or downlink reference signals from source network node 310.

[0066] As indicated by reference numeral 365, after successfully establishing a connection with the target network node 315 (e.g., via a random access procedure), the UE may send an RRC reconfiguration complete message to the target network node 315. Receipt of the RRC reconfiguration message by the target network node 315 may trigger the start of the handover completion phase 340.

[0067] As indicated by reference numeral 370, source network node 310 and target network node 315 may communicate with each other to prepare to release a connection between source network node 310 and UE 305. In some aspects, target network node 315 may determine that the connection between source network node 310 and UE 305 is to be released, such as after receiving an RRC reconfiguration message from UE 305. In this case, target network node 315 may send a handover connection setup complete message to source network node 310. The handover connection setup complete message may cause source network node 310 to stop sending data to UE 305 and / or stop receiving data from UE 305. Additionally or alternatively, the handover connection setup complete message may cause source network node 310 to forward communications associated with UE 305 to target network node 315 and / or notify target network node 315 of the status of one or more communications with UE 305. For example, source network node 310 may forward buffered downlink communications (e.g., downlink data) for UE 305 and / or uplink communications (e.g., uplink data) received from UE 305 to target network node 315. Additionally or alternatively, source network node 310 may notify target network node 315 about a Packet Data Convergence Protocol (PDCP) state associated with UE 305 and / or a sequence number to be used for downlink communications with UE 305.

[0068] As indicated by reference numeral 375, target network node 315 may send an RRC reconfiguration message to UE 305 to instruct UE 305 to release the connection with source network node 310. Upon receiving the instruction to release the connection with source network node 310, UE 305 may cease communicating with source network node 310. For example, UE 305 may refrain from sending uplink communications to source network node 310 and / or may refrain from monitoring downlink communications from source network node 310.

[0069] As indicated by reference numeral 380, the UE may send an RRC reconfiguration complete message to the target network node 315 to indicate that the connection between the source network node 310 and the UE 305 is being released or has been released.

[0070] As shown by reference numeral 385, the target network node 315, the UPF device 320 and / or the AMF device 325 can communicate to switch the user plane path of the UE 305 from the source network node 310 to the target network node 315. Before switching the user plane path, downlink communications for the UE 305 can be routed to the source network node 310 through the core network. After the user plane path is switched, downlink communications for the UE 305 can be routed to the target network node 315 through the core network. Upon completing the switching of the user plane path, the AMF device 325 can send an end marker message to the source network node 310 to inform the completion of the user plane path switching. As shown by reference numeral 390, the target network node 315 and the source network node 310 can communicate to release the source network node 310.

[0071] As part of the handover procedure, UE 305 may maintain simultaneous connections with source network node 310 and target network node 315 during time period 395. Time period 395 may start at the beginning of handover execution phase 335 when UE 305 performs a random access procedure with target network node 315 (e.g., after a handover command from source network node 310 is received by UE 305). Time period 395 may end after releasing the connection between UE 305 and source network node 310 (e.g., after UE 305 receives an instruction from target network node 315 to release source network node 310). By maintaining simultaneous connections with source network node 310 and target network node 315, the handover procedure may be performed with zero or minimal interruption to communications, thereby reducing latency.

[0072] In some cases, UE 305 may report one or more measurements (e.g., channel measurements). UE 305 may report one or more measurements based at least in part on the occurrence of a reporting event. In some cases, the measurements may include RSRP measurements, RSRQ measurements, and / or SINR measurements. Some example reporting events are described below. However, reporting events are not limited to the examples provided.

[0073] In some cases, the reporting event may be event A1. Event A1 may be triggered when the serving cell measurement becomes greater than a threshold. In some cases, event A1 may be used to cancel an ongoing mobility procedure. This may be necessary if the UE 305 moves toward a cell edge and triggers a mobility procedure, but then moves back into good coverage before the mobility procedure has completed.

[0074] In some cases, the reporting event may be event A2. Event A2 may be triggered when the serving cell measurement becomes less than a threshold. In some cases, event A2 may be used to trigger a mobile procedure when UE 305 moves toward a cell edge. Event A2 may not involve any neighboring cell measurements, so it may be used to trigger a blind mobile procedure. Alternatively, it may be used to trigger a group of neighboring cell measurements, which may then be used for a measurement-based mobile procedure. For example, a network node may configure measurement gaps and inter-frequency or inter-system measurements after event A2 has been triggered. Therefore, when coverage conditions are relatively poor and there is a high probability that a handover will be required, UE 305 may only need to complete inter-frequency or inter-system measurements.

[0075] In some cases, the reporting event may be event A3. Event A3 may be triggered when the neighboring cell measurement becomes larger than the special cell measurement by a certain offset. The special cell may be the primary serving cell of a master cell group (MCG) or a secondary cell group (SCG). The offset may be positive or negative. Event A3 may be used for intra-frequency or inter-frequency switching procedures. After the A2 reporting event is triggered, the UE 305 may be configured with a measurement gap and event A3 for inter-frequency switching. Event A3 may provide a switching trigger mechanism based at least in part on relative measurement results. For example, it may be configured to be triggered when the RSRP of a neighboring cell is stronger than the RSRP of a special cell.

[0076] In some cases, the reporting event may be event A4. Event A4 may be triggered when a neighboring cell measurement becomes greater than a threshold. Event A4 may be used for a mobility procedure that does not rely on the coverage of the current serving cell. For example, a load balancing procedure may decide to move UE 305 away from the current serving cell due to load conditions rather than radio conditions. In this case, UE 305 may only need to verify that a candidate target cell provides sufficient coverage.

[0077] In some cases, the reporting event may be event A5. Event A5 may be triggered when the special cell measurement becomes less than a first threshold and the neighboring cell measurement becomes greater than a second threshold. Event A5 may be used for intra-frequency or inter-frequency handover procedures. After the A2 reporting event is triggered, the UE 305 may be configured with a measurement gap and event A5 for inter-frequency handover. Event A5 may provide a handover triggering mechanism based on absolute measurement results. For example, when the current special cell becomes weak and it is necessary to change to another cell that may not meet the criteria for event A3 handover, it may be used to trigger a time-critical handover.

[0078] In some cases, the reporting event may be event A6. Event A6 may be triggered when the neighboring cell measurement becomes larger than the secondary cell measurement by a certain offset. The offset may be positive or negative. This measurement reporting event is applicable to carrier aggregation (e.g., the condition of having a secondary service cell in addition to the primary service cell). Event A6 may be used for a secondary cell exchange procedure. For example, if the primary cell and the secondary cell carrier use different antennas with different azimuths, it may be necessary to exchange the secondary cell. When UE305 moves within the coverage of the primary service cell, this may result in a change in the best secondary cell.

[0079] In some cases, the reporting event may be event B1. Event B1 may be triggered when a neighboring inter-system cell measurement becomes greater than a threshold. Event B1 may be used for inter-system mobility procedures that do not rely on the coverage of the current serving cell. For example, a load balancing procedure decides to leave the NR network and move away from the UE 305 due to load conditions rather than radio conditions. In this case, the UE 305 only needs to verify that the candidate target cell provides sufficient coverage.

[0080] In some cases, the reporting event may be event B2. Event B2 may be triggered when the primary serving cell measurement becomes less than a first threshold, while the neighboring inter-system cell measurement becomes greater than a second threshold. Event B2 may be used to trigger an inter-system mobility procedure when the primary serving cell becomes weak. Inter-system neighbor cell measurements may be used to ensure that the target cell provides adequate coverage.

[0081] As described above, these reporting events are provided as examples only. Reporting events are not limited to the A1, A2, A3, A4, A5, A6, B1, and B2 reporting events described above. In some aspects, the term "greater than a threshold value" means "greater than a threshold value, or greater than or equal to a threshold value". Similarly, the term "less than a threshold value" means "less than a threshold value, or less than or equal to a threshold value".

[0082] In some cases, the handover procedures described herein may result in a ping-pong handover or redirection. "Ping-pong handover or redirection" may refer to UE 305 switching between a source cell (e.g., source network node 310) and a target cell (e.g., target network node 315) multiple times. For example, UE 305 may switch between source network node 310 and target network node 315 multiple times within a certain period of time. This may produce a ping-pong (e.g., back and forth) effect.

[0083] In some cases, ping-pong switching or redirection may occur between an LTE network (e.g., a 4G network) and an NR network (e.g., a 5G network). For example, a first network node 310 (e.g., a source node or a serving node) may be associated with an LTE network, and a second network node 315 (e.g., a target node) may be associated with an NR network. The UE 305 may switch between the first network node 310 associated with the LTE network and the second network node 315 associated with the NR network multiple times within a certain period of time, thereby generating a ping-pong switching or redirection effect between the two networks.

[0084] In some cases, the B1 threshold may be configured to be close to the LTE side and the NR side. For example, it may be easy for the UE 305 to meet the B1 criteria for both the first network node 310 associated with the LTE network and the second network node 315 associated with the NR network. Therefore, the UE 305 may switch between the first network node 310 and the second network node 315 without violating the event B1 reporting condition.

[0085] In some cases, ping-pong switching or redirection may affect call execution. For example, ping-pong switching or redirection may cause missed calls or dropped calls. In some cases, ping-pong switching or redirection may affect data services. For example, UE 305 may experience a delay in the form of data pauses. In some cases, a user interface associated with UE 305 may be converted between an LTE interface and a 5G interface. This may even occur when UE 305 is stationary. Therefore, ping-pong switching or redirection may produce an undesirable experience for the user of UE 305.

[0086] Techniques and apparatus for ping-pong handover or redirection detection and avoidance are described herein. In some aspects, the UE 305 may compare an external list of ping-pong handovers or redirections maintained by an access point and an internal list of ping-pong handovers or redirections maintained by the UE 305. The UE 305 may identify a ping-pong detection criterion for a handover or redirection between the first network node 310 and the second network node 315 based at least in part on the external list indicating a previous ping-pong handover or redirection between the first network node 310 and the second network node 315, the internal list indicating a previous ping-pong handover or redirection between the first network node and the second network node, the external list and the internal list both indicating a previous ping-pong handover or redirection between the first network node and the second network node, or neither the external list nor the internal list indicating a previous ping-pong handover or redirection between the first network node and the second network node. In some aspects, the UE 305 may obtain a configuration indicating one or more measurement conditions associated with a reporting event. The UE 305 may obtain an indication that the reporting event is associated with a handover or redirection between the first network node and the second network node. UE 305 may obtain an indication that the handover or redirection between the first network node and the second network node is a ping-pong handover or redirection.UE 305 may apply one or more other measurement conditions associated with another reporting event to avoid a ping-pong handover or redirection.

[0087] As described above, ping-pong handover or redirection conditions may have a negative impact on the performance of UE 305. For example, ping-pong handover or redirection may result in dropped calls, missed calls and / or delayed data services for UE 305. Using the techniques and devices described herein, UE 305 may be configured to detect ping-pong handover or redirection and / or avoid ping-pong handover or redirection. Therefore, UE 305 may not switch between network nodes, or may switch between network nodes less frequently, thereby improving the performance of UE 305.

[0088] As indicated above, Figure 3 Other examples can be found in the Figure 3 Different than described.

[0089] Figure 4 is a diagram illustrating an example 400 of ping-pong switching or redirection detection according to the present disclosure.

[0090] As shown in conjunction with reference numeral 405, UE 305 can compare the external list of ping-pong handovers and redirections with the internal list of ping-pong handovers and redirections. The external list of ping-pong handovers and redirections can be maintained by the access point. The internal list of ping-pong handovers and redirections can be maintained by UE 305.

[0091] In some aspects, UE 305 may obtain an external list of ping-pong switching and redirection from an access point. For example, an access point may send an external list of ping-pong switching and redirection, and UE 305 may receive the external list. In some aspects, the external list of ping-pong switching and redirection may be an original equipment manufacturer (OEM) list of ping-pong switching and redirection. In some aspects, the OEM list of ping-pong switching and redirection may be an OEM cell global identifier (CGI) list of ping-pong switching and redirection. In some aspects, the external list of ping-pong switching and redirection may be a list of previous ping-pong switching and redirection detected by the access point. For example, an access point may detect a ping-pong switching or redirection (e.g., between a first network node 310 and a second network node 315), and may record the ping-pong switching or redirection in an external list of ping-pong switching and redirection.

[0092] In some aspects, the internal list of ping-pong handovers and redirections may be maintained and stored by the UE 305. For example, the internal list of ping-pong handovers and redirections may be stored in a memory of the UE 305. In some aspects, the internal list of ping-pong handovers and redirections may be a list of previous ping-pong handovers and redirections detected by the UE 305. For example, the UE 305 may detect a ping-pong handover or redirection (e.g., between the first network node 310 and the second network node 315) and may record the ping-pong handover or redirection in an external list of ping-pong handovers and redirections.

[0093] In some aspects, the external list and / or internal list of ping-pong switching and redirection may indicate a ping-pong switching or redirection between a pair of devices (or other device combinations). For example, the external list and / or internal list may indicate that a ping-pong switching or redirection has occurred between the first network node 310 and the second network node 315. As described above, the first network node 310 may be an NR-based network node or an LTE-based network node, and the second network node 315 may be the other of the NR-based network node and the LTE-based network node. In some aspects, the external list and / or internal list of ping-pong switching and redirection may indicate each device associated with a previous ping-pong switching or redirection. For example, the external list and / or internal list may indicate that the first network node 310 is associated with a previous ping-pong switching or redirection.

[0094] As shown in conjunction with reference number 410, UE 305 may identify a ping-pong detection criterion for a handover or redirection between first network node 310 and second network node 315 based at least in part on an external list indicating a previous ping-pong handover or redirection between first network node 310 and second network node 315, an internal list indicating a previous ping-pong handover or redirection between the first network node and the second network node, both the external list and the internal list indicating a previous ping-pong handover or redirection between the first network node and the second network node, or neither the external list nor the internal list indicating a previous ping-pong handover or redirection between the first network node and the second network node. For example, UE 305 may identify the ping pong detection criteria based at least in part on an external list indicating a previous ping pong handover or redirection between first network node 310 and second network node 315, an internal list indicating a previous ping pong handover or redirection between the first network node and the second network node, both the external list and the internal list indicating a previous ping pong handover or redirection between the first network node and the second network node, or neither the external list nor the internal list indicating a previous ping pong handover or redirection between the first network node and the second network node. Additionally or alternatively, UE 305 may identify the ping pong detection criteria based at least in part on one or more other factors or conditions.

[0095] In some aspects, the UE 305 may determine whether the external list of ping-pong handovers and redirections and / or the internal list of ping-pong handovers and redirections indicate a previous ping-pong handover or redirection between the first network node 310 and the second network node 315. For example, the UE 305 may compare the external list and the internal list (as described above in conjunction with reference numeral 405), and may determine whether both the external list and the internal list indicate a previous ping-pong handover or redirection, whether only the external list indicates a previous ping-pong handover or redirection, whether only the internal list indicates a previous ping-pong handover or redirection, or whether neither the external list nor the internal list indicates a previous ping-pong handover or redirection. The UE 305 may determine a ping-pong detection criterion to be applied to a current or future ping-pong detection based at least in part on the comparison.

[0096] In some aspects, UE 305 may identify a first ping-pong detection criterion based at least in part on the fact that both the external list and the internal list indicate a previous ping-pong handover or redirection between first network node 310 and second network node 315. In some aspects, the first ping-pong detection criterion may be associated with a high degree of strictness. For example, the first ping-pong detection criterion may indicate that a single handover or redirection between first network node 310 and second network node 315 should be classified as a ping-pong handover or redirection. Since both the external list and the internal list indicate that a previous ping-pong handover or redirection between first network node 310 and second network node 315 occurred, the probability that a current or future handover or redirection between first network node 310 and second network node 315 is a ping-pong handover or redirection may be high.

[0097] In some aspects, UE 305 may identify a second ping-pong detection criterion based at least in part on the fact that only one of the external list or the internal list indicates a previous ping-pong handover or redirection between first network node 310 and second network node 315. In some aspects, the second ping-pong detection criterion may be associated with a medium degree of strictness. In some aspects, the second ping-pong detection criterion may indicate that a certain number of handovers or redirections between first network node 310 and second network node 315 within a certain time period should be classified as ping-pong handovers or redirections. For example, the second ping-pong detection criterion may indicate that two handovers or redirections within the time period indicate ping-pong handovers or redirections. Since only one of the external list and the internal list indicates that a previous ping-pong occurred between first network node 310 and second network node 315, the probability that a current or future handover or redirection between first network node 310 and second network node 315 is a ping-pong handover or redirection may be medium.

[0098] In some aspects, UE 305 may identify a third ping-pong detection criterion based at least in part on the fact that both the external list and the internal list do not indicate a previous ping-pong handover or redirection between the first network node 310 and the second network node 315. In some aspects, the third ping-pong detection criterion may be associated with a low degree of strictness. In some aspects, the third ping-pong detection criterion may indicate that a certain number of handovers or redirections between the first network node 310 and the second network node 315 within a certain time period should be classified as ping-pong handovers or redirections. For example, the third ping-pong detection criterion may indicate that four handovers or redirections within the time period indicate ping-pong handovers or redirections. Since both the external list and the internal list do not indicate that a previous ping-pong handover or redirection between the first network node 310 and the second network node 315 occurred, the probability that the current or future handover or redirection between the first network node 310 and the second network node 315 is a ping-pong handover or redirection may be low.

[0099] In some aspects, UE 305 may record a ping-pong handover or redirection between first network node 310 and second network node 315 based at least in part on identifying the ping-pong handover or redirection. For example, UE 305 may detect a ping-pong handover or redirection condition based at least in part on one or more of the ping-pong detection criteria, and may record the cell and frequency of first network node 310 and the cell and frequency of second network node 315 in an internal list as a ping-pong handover or redirection combination.

[0100] In some aspects, UE 305 may record the ping-pong combination based at least in part on detecting that a third criterion has been met (e.g., both the external list and the internal list indicate a previous ping-pong handover or redirection). For example, UE 305 may record the cell and frequency of first network node 310 and the cell and frequency of second network node 315 as a ping-pong handover or redirection combination based at least in part on a single handover or redirection from first network node 310 to second network node 315.

[0101] In some aspects, UE 305 may record the ping-pong combination based at least in part on detecting that a second criterion has been met (e.g., only one of the external list and the internal list indicates a previous ping-pong handover or redirection). For example, UE 305 may record the cell and frequency of first network node 310 and the cell and frequency of second network node 315 as a ping-pong handover or redirection combination based at least in part on at least two handovers or redirections from first network node 310 to second network node 315 occurring within the time period.

[0102] In some aspects, UE 305 may record the ping-pong combination based at least in part on detecting that a third criterion has been met (e.g., neither the external list nor the internal list indicates a previous ping-pong handover or redirection). For example, UE 305 may record the cell and frequency of first network node 310 and the cell and frequency of second network node 315 as a ping-pong handover or redirection combination based at least in part on at least four handovers or redirections from first network node 310 to second network node 315 occurring within the time period.

[0103] In some aspects, the UE 305 may maintain a single timer for ping-pong handover or redirection detection. For example, the UE 305 may use the same timer to apply the first ping-pong detection criterion, the second ping-pong detection criterion, and / or the third ping-pong detection criterion.

[0104] As described above, ping-pong handover or redirection conditions may have a negative impact on the performance of UE 305. For example, ping-pong handover or redirection may result in dropped calls, missed calls and / or delayed data services for UE 305. Using the techniques and devices described herein, UE 305 may be configured to detect ping-pong handover or redirection and / or avoid ping-pong handover or redirection. Therefore, UE 305 may not switch between network nodes, or may switch between network nodes less frequently, thereby improving the performance of UE 305.

[0105] As indicated above, Figure 4 Other examples can be found in the Figure 4 Different than described.

[0106] Figure 5 is a diagram illustrating an example 500 of ping-pong switching or redirection avoidance according to the present disclosure.

[0107] As shown in conjunction with reference numeral 505, UE 305 may obtain a configuration indicating one or more measurement conditions associated with a reporting event. The reporting event may correspond to one or more of the reporting events described above. For example, the reporting event may be event A2 or event B2. The one or more measurement conditions may be referred to herein as "measurement conditions". Thus, the measurement conditions may include a single measurement condition or multiple measurement conditions.

[0108] In some aspects, the measurement condition may include one or more channel measurement conditions, such as one or more channel measurement thresholds. For example, the measurement condition may include an RSRP threshold, an RSRQ threshold, and / or an SINR threshold associated with the reporting event. In some aspects, different reporting events may be associated with different measurement conditions or thresholds. For example, event B1 may be associated with a first measurement condition including a first RSRP threshold, a first RSRQ threshold, and / or a first SINR threshold, and event B2 may be associated with a second measurement condition including a second RSRP threshold, a second RSRQ threshold, and / or a second SINR threshold. The second measurement condition may be stricter than the first measurement condition. For example, the second RSRQ threshold may be stricter (e.g., higher) than the first RSRP threshold. In some aspects, if the second measurement condition is unlikely to result in a ping-pong switch or redirection condition, the second measurement condition may be "stricter" than the first measurement condition.

[0109] As shown in conjunction with reference numeral 510, UE 305 may obtain an indication that the reporting event is associated with a handover or redirection between first network node 310 and second network node 315. For example, UE 305 may determine that the reporting event is associated with a handover or redirection between first network node 310 and second network node 315.

[0110] In a first example, as described above, event B1 may be triggered when a measurement associated with a neighboring inter-system cell becomes greater than a threshold. UE 305 may determine that a handover or redirection from first network node 310 to second network node 315 corresponds to an event B1 report. For example, UE 305 may determine a handover or redirection based at least in part on a measurement associated with a neighboring inter-system cell becoming greater than a threshold.

[0111] In a second example, as described above, event A2 may be triggered when a serving cell measurement becomes less than a threshold. UE 305 may determine that a handover or redirection from first network node 310 to second network node 315 corresponds to an event A2 report. For example, UE 305 may determine a handover or redirection based at least in part on a measurement associated with a serving cell becoming less than a threshold.

[0112] In some aspects, the UE 305 may determine that the reporting event is associated with a handover or redirection between the first network node 310 and the second network node 315 based at least in part on a time threshold (e.g., a threshold time period). For example, the UE 305 may determine that the reporting event is associated with the handover or redirection based at least in part on a time period between the reporting event and the handover or redirection being less than a threshold, or less than or equal to a threshold. Alternatively, the UE 305 may determine that the reporting event is not associated with the handover or redirection based at least in part on a time period between the reporting event and the handover or redirection being greater than a threshold, or greater than or equal to a threshold.

[0113] In some aspects, the UE 305 may determine whether the handover or redirection is a NR2L handover or redirection and / or a L2NR handover or redirection. Example features of NR2L and L2NR handovers or redirections are described in conjunction with Table 1.

[0114] Table 1: NR2L and L2NR switching

[0115]

[0116] As shown in conjunction with reference numeral 515, UE 305 may obtain an indication that the handover or redirection between first network node 310 and second network node 315 is a ping-pong handover or redirection. For example, UE 305 may determine that the handover or redirection between first network node 310 and second network node 315 is a ping-pong handover or redirection as described above in conjunction with example 400.

[0117] As shown in conjunction with reference numeral 520, UE 305 may apply one or more other measurement conditions to avoid or mitigate ping-pong switching or redirection. One or more other measurement conditions may be referred to herein as "other measurement conditions". Thus, the other measurement conditions may include a single other measurement condition or multiple other measurement conditions. As described above, the other measurement conditions may be stricter than the measurement conditions (e.g., the configured measurement conditions).

[0118] In the first example above, UE 305 may determine that the handover or redirection is associated with event B1. For example, the handover or redirection may be associated with a reporting event that is caused by a measurement associated with an adjacent inter-system cell becoming greater than a threshold. However, UE 305 may not apply the measurement condition associated with event B1. Instead, UE 305 may apply a measurement condition associated with event B2 (e.g., an internal B2 measurement condition). The internal B2 measurement condition may be the same as the measurement condition associated with event B2, or may be based at least in part on the measurement condition associated with event B2. Since the internal B2 measurement condition is stricter than the measurement condition configured for event B1, UE 305 is less likely to identify the handover or redirection as a ping-pong handover or redirection.

[0119] In some aspects, the UE 305 may initiate a ping-pong timer associated with event Bl. The UE 305 may apply internal B2 measurement conditions during an active state of the ping-pong timer for event Bl (eg, while the ping-pong timer is running) for evaluating a ping-pong handover or redirection event.

[0120] In some aspects, UE 305 may determine to avoid ping-pong handover or redirection if a serving cell (e.g., a cell associated with first network node 310) is in good radio frequency (RF) conditions. In some aspects, "avoiding" or "mitigating" ping-pong handover or redirection may include not performing or attempting not to perform a handover or redirection between first network node 310 and second network node 315 (e.g., from first network node 310 to second network node 315). For example, UE 305 may detect a handover or redirection situation involving multiple handovers or redirections between first network node 310 and second network node 315, but may "avoid" or "mitigate" ping-pong handover or redirection by not performing any additional handovers or redirections between first network node 310 and second network node 315.

[0121] In the example where the serving cell is an NR serving cell, the RSRP threshold, RSRQ threshold, or SINR threshold associated with the internal B2 measurement condition may be greater than the RSRP measurement, RSRQ measurement, or SINR measurement of the serving cell, respectively. In the example where the serving cell is an LTE serving cell, the RSRP threshold or RSRQ threshold associated with the internal B2 measurement condition may be greater than the RSRP measurement or RSRQ measurement of the serving cell, respectively.

[0122] In some aspects, the threshold condition of the target cell (e.g., a cell associated with the second network node 315) may be more stringent than the internal B2 measurement condition. In an example where the serving cell is an NR serving cell, the RSRP threshold, RSRQ threshold, or SINR threshold associated with the internal B2 measurement condition may be lower than the RSRP measurement, RSRQ measurement, or SINR measurement of the serving cell, respectively. In an example where the serving cell is an LTE serving cell, the RSRP threshold or RSRQ threshold associated with the internal B2 measurement condition may be lower than the RSRP measurement or RSRQ measurement of the serving cell, respectively.

[0123] In the second example above, UE 305 may determine that the handover or redirection is associated with event A2. For example, the handover or redirection may be associated with a reporting event generated due to a serving cell measurement becoming less than a threshold. However, UE 305 may not apply the configured measurement conditions associated with the A2 reporting event. Instead, UE 305 may apply one or more internal A2 measurement conditions. The internal A2 measurement conditions may be based at least in part on the configured measurement conditions of event A2. Since the internal A2 measurement conditions are stricter than the configured event A2 measurement conditions, UE 305 is less likely to identify the handover or redirection as a ping-pong handover or redirection.

[0124] In some aspects, the UE 305 may initiate a ping-pong timer associated with event A2. The UE 305 may apply internal A2 measurement conditions during an active state of the ping-pong timer for event A2 (eg, when the ping-pong timer is running) for evaluating a ping-pong handover or redirection event.

[0125] In some aspects, in an example where the serving cell is an NR serving cell, the RSRP threshold, RSRQ threshold, or SINR threshold associated with the internal A2 measurement condition may be lower than the lowest RSRP measurement, RSRQ measurement, or SINR measurement of the serving cell, respectively. In an example where the serving cell is an LTE serving cell, the RSRP threshold or RSRQ threshold associated with the internal B2 measurement condition may be lower than the lowest RSRP measurement or RSRQ measurement of the serving cell, respectively.

[0126] In some aspects, even after applying one or more other measurement conditions, it may not be possible to avoid or mitigate switching or redirection. In this case, UE 305 may identify one or more additional measurement conditions to avoid ping-pong switching or redirection. For example, UE 305 may determine to perform switching or redirection to a third network node. In one example, UE 305 may select a third network node that is not associated with any previous ping-pong switching or redirection. In another example, UE 305 may select a third network node that is not associated with a previous ping-pong switching or redirection using the first network node 310 or the second network node 315. UE 305 may be configured to prioritize the selection of the third network node based at least in part on a previous switching or redirection associated with the third network node. In some aspects, UE 305 may increase the severity of other measurement conditions. Increasing the severity of other measurement conditions may further reduce the possibility that switching or redirection is a ping-pong switching or redirection. For example, UE 305 may increase the RSRP, RSRQ and / or SINR thresholds of the internal B2 measurement condition or the internal A2 measurement condition to avoid ping-pong switching or redirection.

[0127] In a first example scenario, a first cell associated with a first network node 310 may be an NR cell, and a second cell associated with a second network node 315 may be an LTE cell. The first cell may be configured with an LTE neighbor and may be configured for event B1. The second cell may be configured with an NR neighbor and may be configured for event B1. UE 305 may camp on the first cell. For NR neighbors, the RSRP of the first cell may be higher than the B1 threshold of the second cell. For LTE neighbors, the RSRP of the second cell may be higher than the B1 threshold of the first cell. UE 305 may be in a stationary state. After several handovers or redirections between the first cell and the second cell, UE 305 may stay in the first cell or the second cell for a period of time. In this example, UE 305 may not report a B1 event after several handovers or redirections occur.

[0128] In a second example scenario, a first cell associated with the first network node 310 may be an NR cell, and a second cell associated with the second network node 315 may be an LTE cell. The first cell may be configured for event A2. The second cell may be configured for event B1. UE 305 may camp on the first cell. The RSRP of the first cell may be lower than the A2 threshold of the second cell. The RSRP of the second cell may be higher than the B1 threshold of the first cell. UE 305 may be in a stationary state. After several handovers or redirections between the first cell and the second cell, UE 305 may stay in the first cell or the second cell for a period of time. In this example, UE 305 may not report an A2 event after several handovers or redirections occur.

[0129] As described above, ping-pong handover or redirection conditions may have a negative impact on the performance of UE 305. For example, ping-pong handover or redirection may result in dropped calls, missed calls and / or delayed data services for UE 305. Using the techniques and devices described herein, UE 305 may be configured to detect ping-pong handover or redirection and / or avoid ping-pong handover or redirection. Therefore, UE 305 may not switch between network nodes, or may switch between network nodes less frequently, thereby improving the performance of UE 305.

[0130] As indicated above, Figure 5 Other examples can be found in the Figure 5 Different than described.

[0131] Figure 6 is a diagram illustrating an example 600 of ping-pong switching or redirection avoidance according to the present disclosure.

[0132] As shown in conjunction with reference numeral 605, the UE 305 may obtain an external list of ping-pong handovers or redirections. The external list of ping-pong handovers or redirections may be received from the access point. The external list of ping-pong handovers or redirections may be a combination of the above. Figure 4 An external list of ping-pong switching or redirection as described in Example 400 described in.

[0133] As shown in conjunction with reference numeral 610, the UE 305 may obtain an internal list of ping-pong handovers or redirections. The internal list of ping-pong handovers or redirections may be stored at the UE 305. The internal list of ping-pong handovers or redirections may be the combination of the above. Figure 4 An internal list of ping-pong switching or redirection as described in Example 400 described in.

[0134] As shown in conjunction with reference numeral 615, UE 305 may perform a comparison of an external list of ping-pong handovers or redirections and an internal list of ping-pong handovers or redirections. For example, UE 305 may compare the external list with the internal list, as shown in conjunction with Figure 4 As described with reference number 405 described above.

[0135] As indicated in conjunction with reference numeral 620, the UE 305 can determine, based at least in part on the comparison, that a previous ping-pong handover or redirection condition between the first network node 310 and the second network node 315 is identified in both the external list and the internal list of ping-pong handovers or redirections.

[0136] As shown in conjunction with reference numeral 625, UE 305 may apply the first criterion based at least in part on both the external list and the internal list indicating a previous ping-pong handover or redirection between first network node 310 and second network node 315. As described herein, the first criterion may be associated with a high degree of strictness. For example, the first criterion may indicate that a single handover or redirection between first network node 310 and second network node 315 should be classified as a ping-pong handover or redirection.

[0137] As indicated in conjunction with reference numeral 630, the UE 305 can determine, based at least in part on the comparison, that a previous ping-pong handover or redirection condition between the first network node 310 and the second network node 315 is identified in an external list of ping-pong handovers or redirections.

[0138] As shown in conjunction with reference numeral 635, UE 305 may apply a second criterion based at least in part on only the external list indicating a previous ping-pong handover or redirection between first network node 310 and second network node 315. As described herein, the second criterion may be associated with a medium level of strictness. For example, the second criterion may indicate that two handovers or redirections within the time period indicate a ping-pong handover or redirection.

[0139] As indicated in conjunction with reference numeral 640, the UE 305 can determine, based at least in part on the comparison, that a previous ping-pong handover or redirection condition between the first network node 310 and the second network node 315 is identified in an internal list of ping-pong handovers or redirections.

[0140] As shown in conjunction with reference numeral 645, UE 305 may apply a second criterion based at least in part on only the internal list indicating a previous ping-pong handover or redirection between first network node 310 and second network node 315. As described herein, the second criterion may be associated with a medium level of strictness. For example, the second criterion may indicate that two handovers or redirections within the time period indicate a ping-pong handover or redirection.

[0141] As shown in conjunction with reference numeral 650, UE 305 may determine based at least in part on the comparison that a previous ping-pong handover or redirection condition between first network node 310 and second network node 315 was identified neither in an external list of ping-pong handovers or redirections nor in its internal list.

[0142] As shown in conjunction with reference numeral 655, UE 305 may apply a third criterion based at least in part on the fact that both the external list and the internal list do not indicate a previous ping-pong handover or redirection between first network node 310 and second network node 315. As described herein, the third criterion may be associated with a low degree of stringency. For example, the third criterion may indicate that four handovers or redirections within the time period indicate a ping-pong handover or redirection.

[0143] As indicated above, Figure 6 Other examples can be found in the Figure 6 Different than described.

[0144] Figure 7 are diagrams illustrating examples 700 and 705 of ping-pong switching or redirection avoidance according to the present disclosure.

[0145] In a first example 700, as shown in conjunction with reference numeral 710, a UE 305 may communicate with a first cell (eg, associated with a network node 310) using a first frequency.

[0146] As shown in conjunction with reference numeral 715, the UE 305 may receive an event Bl report associated with the second frequency.

[0147] As shown in conjunction with reference numeral 720, UE 305 may communicate with a second cell (e.g., associated with network node 315) using a second frequency. For example, UE 305 may perform a handover or redirection from a first cell to a second cell. UE 305 may determine whether the handover or redirection from the first cell to the second cell is associated with a ping-pong event. For example, if the time period between event B1 reporting and the handover or redirection is less than, or less than or equal to a time period threshold, UE 305 may determine that the handover or redirection is associated with a ping-pong event. Alternatively, if the time period between event B1 reporting and the handover or redirection is greater than, or greater than or equal to a time period threshold, UE 305 may determine that the handover or redirection is not associated with a ping-pong event.

[0148] As shown in conjunction with reference numeral 725, the UE 305 can apply internal B2 measurement conditions (described herein) based at least in part on determining that the handover or redirection is associated with a ping-pong event. The UE 305 can apply the internal B2 measurement conditions to avoid or mitigate ping-pong handovers or redirections.

[0149] In a second example 705, as shown in conjunction with reference numeral 730, the UE 305 may communicate with a first cell (eg, associated with the network node 310) using a first frequency.

[0150] As shown in conjunction with reference numeral 735, the UE 305 may receive an event A2 report.

[0151] As shown in conjunction with reference numeral 740, UE 305 may communicate with a second cell (e.g., associated with network node 315) using a second frequency. For example, UE 305 may perform a handover or redirection from a first cell to a second cell. UE 305 may determine whether the handover or redirection from the first cell to the second cell is associated with a ping-pong event. For example, if the time period between event A2 reporting and the handover or redirection is less than, or less than or equal to a time period threshold, UE 305 may determine that the handover or redirection is associated with a ping-pong event. Alternatively, if the time period between event A2 reporting and the handover or redirection is greater than, or greater than or equal to a time period threshold, UE 305 may determine that the handover or redirection is not associated with a ping-pong event.

[0152] As shown in conjunction with reference numeral 745, the UE 305 can utilize a minimum RSRP threshold to prevent A2 events. For example, the UE 305 can apply a minimum RSRP threshold (described herein) to event A2 to avoid or mitigate ping-pong handovers or redirections.

[0153] As indicated above, Figure 7 Other examples can be found in the Figure 7 Different than described.

[0154] Figure 8 is a diagram illustrating an example process 800 performed, for example, by a UE in accordance with the present disclosure. Example process 800 is an example of a UE (eg, UE 120) performing operations associated with ping-pong handover or redirection detection and avoidance.

[0155] like Figure 8 As shown, in some aspects, process 800 may include comparing an external list of ping-pong switches or redirections maintained by an access point with an internal list of ping-pong switches or redirections maintained by a UE (block 810). For example, a UE (e.g., using Fig.10 The communication manager 140 and / or comparison component 1008 depicted in FIG. 1008 ) compares an external list of ping-pong handovers or redirections maintained by the access point and an internal list of ping-pong handovers or redirections maintained by the UE, as described above with reference to, for example, Figure 4 , Figure 5 , Figure 6 and / or Figure 7 As described.

[0156] like Figure 8 As further shown in FIG. 8 , in some aspects, process 800 may include identifying a ping-pong detection criterion for a handover or redirection between the first network node and the second network node based at least in part on an external list indicating a previous ping-pong handover or redirection between the first network node and the second network node, an internal list indicating a previous ping-pong handover or redirection between the first network node and the second network node, both the external list and the internal list indicating a previous ping-pong handover or redirection between the first network node and the second network node, or neither the external list nor the internal list indicating a previous ping-pong handover or redirection between the first network node and the second network node (block 820). For example, a UE (e.g., using Fig.10 The communication manager 140 and / or identification component 1010 depicted in FIG. 1 may identify a ping-pong detection criterion for a handover or redirection between the first network node and the second network node based at least in part on an external list indicating a previous ping-pong handover or redirection between the first network node and the second network node, an internal list indicating a previous ping-pong handover or redirection between the first network node and the second network node, both the external list and the internal list indicating a previous ping-pong handover or redirection between the first network node and the second network node, or neither the external list nor the internal list indicating a previous ping-pong handover or redirection between the first network node and the second network node, as described above with reference to, for example Figure 4 , Figure 5 , Figure 6 and / or Figure 7 As described.

[0157] Process 800 may include additional aspects, such as any single aspect or any combination of aspects described below and / or in conjunction with one or more other processes described elsewhere herein.

[0158] In a first aspect, identifying a ping-pong detection criterion includes identifying a first ping-pong detection criterion based at least in part on both the external list and the internal list indicating a previous ping-pong handover or redirection between the first network node and the second network node, identifying a second ping-pong detection criterion based at least in part on only one of the external list or the internal list indicating a previous ping-pong handover or redirection between the first network node and the second network node, or identifying a third ping-pong detection criterion based at least in part on neither the external list nor the internal list indicating a previous ping-pong handover or redirection between the first network node and the second network node.

[0159] In a second aspect, alone or in combination with the first aspect, the first ping-pong detection criteria indicates identifying a ping-pong handover or redirection condition based at least in part on a single handover or redirection occurrence between the first network node and the second network node.

[0160] In a third aspect, alone or in combination with one or more of the first and second aspects, process 800 includes detecting a single handover or redirection occurrence between a first network node and a second network node, and indicating a cell and frequency of the first network node and a cell and frequency of the second network node in an internal list as a ping-pong handover or redirection combination based at least in part on detecting the single handover or redirection occurrence.

[0161] In a fourth aspect, alone or in combination with one or more of the first to third aspects, the second ping-pong detection criteria indicates identifying a ping-pong handover or redirection condition based at least in part on two or more handovers or redirections occurring between the first network node and the second network node within a certain time period.

[0162] In a fifth aspect, alone or in combination with one or more of the first to fourth aspects, process 800 includes detecting two or more handovers or redirections between a first network node and a second network node within the time period, and indicating a cell and frequency of the first network node and a cell and frequency of the second network node in an internal list as a ping-pong handover or redirection combination based at least in part on detecting two or more handovers or redirections within the time period.

[0163] In a sixth aspect, alone or in combination with one or more of the first to fifth aspects, the third ping-pong detection criteria indicates identifying a ping-pong switching or redirection condition based at least in part on four or more switching or redirection occurrences between the first network node and the second network node within a certain time period.

[0164] In a seventh aspect, alone or in combination with one or more of the first to sixth aspects, process 800 includes detecting four or more handover or redirection occurrences between a first network node and a second network node within the time period, and indicating a cell and frequency of the first network node and a cell and frequency of the second network node in an internal list as a ping-pong handover or redirection combination based at least in part on detecting four or more handover occurrences within the time period.

[0165] In an eighth aspect, either alone or in combination with one or more of the first to seventh aspects, the first network node is a Long Term Evolution (LTE) based network node or a New Radio (NR) based network node, and the second network node is the other of the LTE based network node or the NR based network node.

[0166] although Figure 8 An example block diagram of process 800 is shown, but in some aspects, process 800 may include Figure 8Additional blocks, fewer blocks, different blocks, or blocks arranged in a different manner than those depicted in the process 800. Additionally or alternatively, two or more blocks of the blocks of process 800 may be performed in parallel.

[0167] Fig. 9 is a diagram illustrating an example process 900 performed, for example, by a UE in accordance with the present disclosure. Example process 900 is an example of a UE (eg, UE 120) performing operations associated with ping-pong handover or redirection detection and avoidance.

[0168] like Fig. 9 As shown, in some aspects, process 900 may include obtaining a configuration indicating one or more measurement conditions associated with a reporting event (block 910). Fig.10 The communication manager 140 and / or obtaining component 10 14) depicted in FIG. 1 may obtain a configuration indicating one or more measurement conditions associated with a reporting event, as described above with reference to, for example, Figure 4 , Figure 5 , Figure 6 and / or Figure 7 As described.

[0169] like Fig. 9 As further shown, in some aspects, process 900 may include obtaining an indication that the reporting event is associated with a handover or redirection between the first network node and the second network node (block 920). Fig.10 The communication manager 140 and / or obtaining component 1014 depicted in FIG. 100 may obtain an indication that the reporting event is associated with a handover or redirection between a first network node and a second network node, as described above with reference to, for example, Figure 4 , Figure 5 , Figure 6 and / or Figure 7 As described.

[0170] like Fig. 9 As further shown, in some aspects, process 900 may include obtaining an indication that a handover or redirection between a first network node and a second network node is a ping-pong handover or redirection (block 930). Fig.10 The communication manager 140 and / or obtaining component 1014 depicted in FIG. 1 may obtain an indication that the handover or redirection between the first network node and the second network node is a ping-pong handover or redirection, as described above with reference to, for example, Figure 4 , Figure 5 , Figure 6 and / or Figure 7 As described.

[0171] like Fig. 9As further shown, in some aspects, process 900 may include applying one or more other measurement conditions to avoid ping-pong switching or redirection (block 940). Fig.10 The communication manager 140 and / or the initiating component 10 16 depicted in FIG. 10A may apply one or more other measurement conditions to avoid ping-pong switching or redirection, as described above with reference to, for example, Figure 4 , Figure 5 , Figure 6 and / or Figure 7 As described.

[0172] Process 900 may include additional aspects, such as any single aspect or any combination of aspects described below and / or in conjunction with one or more other processes described elsewhere herein.

[0173] In a first aspect, process 900 includes determining not to perform a ping-pong handover or a redirection based at least in part on applying one or more other measurement conditions.

[0174] In a second aspect, either alone or in combination with the first aspect, obtaining an indication that the handover or redirection between the first network node and the second network node is a ping-pong handover or redirection comprises determining that a time interval between a reporting event and the handover or redirection is less than a threshold time interval.

[0175] In a third aspect, alone or in combination with one or more of the first and second aspects, the one or more other measurement conditions are more stringent than the one or more measurement conditions.

[0176] In a fourth aspect, alone or in combination with one or more of the first to third aspects, one or more other measurement conditions are associated with another reporting event.

[0177] In a fifth aspect, alone or in combination with one or more of the first to fourth aspects, the reporting event is a B1 reporting event and the other reporting event is an internal B2 reporting event.

[0178] In a sixth aspect, either alone or in combination with one or more of the first to fifth aspects, process 900 includes initiating a timer associated with a reporting event, and applying one or more other measurement conditions during an active state of the timer to avoid ping-pong switching or redirection.

[0179] In the seventh aspect, alone or in combination with one or more of the first to sixth aspects, one or more other measurement conditions include a reference signal received power (RSRP) threshold, a reference signal received quality (RSRQ) threshold, or a signal to interference plus noise ratio (SINR) threshold, which are respectively greater than the RSRP measurement, RSRQ measurement, or SINR measurement of the second network node.

[0180] In the eighth aspect, alone or in combination with one or more of the first to seventh aspects, one or more other measurement conditions include a reference signal received power (RSRP) threshold, a reference signal received quality (RSRQ) threshold, or a signal to interference plus noise ratio (SINR) threshold, which are respectively less than the RSRP measurement, RSRQ measurement, or SINR measurement of the first network node.

[0181] In a ninth aspect, alone or in combination with one or more of the first to eighth aspects, the reporting event is an A2 reporting event.

[0182] In a tenth aspect, either alone or in combination with one or more of the first to ninth aspects, process 900 includes initiating a timer associated with a reporting event, and applying one or more other measurement conditions during an active state of the timer to avoid ping-pong switching or redirection.

[0183] In the eleventh aspect, alone or in combination with one or more of the first to tenth aspects, one or more other measurement conditions include an RSRP threshold, an RSRQ threshold, or an SINR threshold, which is respectively less than the lowest RSRP measurement, the lowest RSRQ measurement, or the lowest SINR measurement of the second network node.

[0184] In a twelfth aspect, either alone or in combination with one or more of the first to eleventh aspects, process 900 includes performing a handover or redirection to a third network node, or changing a measurement condition threshold, based at least in part on the ping-pong handover or redirection not being avoided by applying one or more other measurement conditions.

[0185] In a thirteenth aspect, alone or in combination with one or more of the first to twelfth aspects, the third network node is not associated with a previous handover or redirection condition.

[0186] although Fig. 9 An example block diagram of process 900 is shown, but in some aspects, process 900 may include Fig. 9 Additional blocks, fewer blocks, different blocks, or blocks arranged in a different manner than those depicted in the process 900. Additionally or alternatively, two or more of the blocks in the process 900 may be performed in parallel.

[0187] Fig.101 is a diagram of an exemplary apparatus 1000 for wireless communication. Apparatus 1000 may be a UE, or a UE may include apparatus 1000. In some aspects, apparatus 1000 includes a receiving component 1002 and a sending component 1004 that may communicate with each other (e.g., via one or more buses and / or one or more other components). As shown, apparatus 1000 may communicate with another apparatus 1006 (such as a UE, a base station, or another wireless communication device) using receiving component 1002 and sending component 1004. As further shown, apparatus 1000 may include a communication manager 140. Communication manager 140 may include one or more of a comparison component 1008, an identification component 1010, a recording component 1012, an acquisition component 1014, or an initiation component 1016, etc.

[0188] In some aspects, the apparatus 1000 may be configured to perform Figures 4 to 7 Additionally or alternatively, the apparatus 1000 may be configured to perform one or more processes described herein, such as Figure 8 The process of 800 Fig. 9 In some aspects, the apparatus 1000 and / or Fig.10 One or more of the components shown may include a combination of Figure 2 Additionally or alternatively, Fig.10 One or more of the components shown may be combined with Figure 2 Additionally or alternatively, one or more components in the component set may be implemented at least in part as software stored in a memory. For example, a component (or a portion of a component) may be implemented as instructions or code stored in a non-transitory computer-readable medium and may be executed by a controller or processor to perform the function or operation of the component.

[0189] The receiving component 1002 may receive communications, such as reference signals, control information, data communications, or combinations thereof, from the device 1006. The receiving component 1002 may provide the received communications to one or more other components of the device 1000. In some aspects, the receiving component 1002 may perform signal processing (such as filtering, amplification, demodulation, analog-to-digital conversion, demultiplexing, deinterleaving, demapping, equalization, interference cancellation, or decoding) on ​​the received communications and may provide the processed signals to one or more other components of the device 1000. In some aspects, the receiving component 1002 may include combining Figure 2 One or more antennas, modems, demodulators, MIMO detectors, receive processors, controllers / processors, memories, or combinations thereof of the described UE.

[0190] The transmitting component 1004 may transmit communications, such as reference signals, control information, data communications, or combinations thereof, to the device 1006. In some aspects, one or more other components of the device 1000 may generate communications and may provide the generated communications to the transmitting component 1004 for transmission to the device 1006. In some aspects, the transmitting component 1004 may perform signal processing (such as filtering, amplification, modulation, digital-to-analog conversion, multiplexing, interleaving, mapping, or encoding, etc.) on the generated communications and may transmit the processed signals to the device 1006. In some aspects, the transmitting component 1004 may include combining Figure 2 One or more antennas, modems, modulators, transmit MIMO processors, transmit processors, controllers / processors, memories, or combinations thereof of the described UE. In some aspects, the transmit component 1004 can be co-located with the receive component 1002 in a transceiver.

[0191] Comparing component 1008 can compare an external list of ping-pong handovers or redirections maintained by the access point and an internal list of ping-pong handovers or redirections maintained by the UE. Identifying component 1010 can identify a ping-pong detection criterion for a handover or redirection between the first network node and the second network node based at least in part on the external list indicating a previous ping-pong handover or redirection between the first network node and the second network node, the internal list indicating a previous ping-pong handover or redirection between the first network node and the second network node, both the external list and the internal list indicating a previous ping-pong handover or redirection between the first network node and the second network node, or neither the external list nor the internal list indicating a previous ping-pong handover or redirection between the first network node and the second network node.

[0192] The identification component 1010 can detect a single handover or redirection occurrence between the first network node and the second network node. The recording component 1012 can indicate the cell and frequency of the first network node and the cell and frequency of the second network node in an internal list as a ping-pong handover or redirection combination based at least in part on detecting the single handover or redirection occurrence.

[0193] The identification component 1010 can detect that two or more handovers or redirections occur between the first network node and the second network node within a certain time period. The recording component 1012 can indicate the cell and frequency of the first network node and the cell and frequency of the second network node in an internal list as a ping-pong handover or redirection combination based at least in part on detecting that two or more handovers or redirections occur within the time period.

[0194] The identifying component 1010 can detect four or more handover or redirection occurrences between the first network node and the second network node within a time period. The recording component 1012 can indicate the cell and frequency of the first network node and the cell and frequency of the second network node in an internal list as a ping-pong handover or redirection combination based at least in part on detecting four or more handover occurrences within the time period.

[0195] The obtaining component 1014 may obtain a configuration indicating one or more measurement conditions associated with the reporting event. The obtaining component 1014 may obtain an indication that the reporting event is associated with a handover or redirection between the first network node and the second network node. The obtaining component 1014 may obtain an indication that the handover or redirection between the first network node and the second network node is a ping-pong handover or redirection. The obtaining component 1014 may apply one or more other measurement conditions to avoid a ping-pong handover or redirection.

[0196] The identification component 1010 can determine not to perform a ping-pong handover or redirection based at least in part on applying one or more other measurement conditions.

[0197] The initiating component 1016 can initiate a timer associated with the reporting event. The initiating component 1016 can apply one or more other measurement conditions during the active state of the timer to avoid ping-pong switching or redirection.

[0198] The initiating component 1016 can initiate a timer associated with the reporting event. The initiating component 1016 can apply one or more other measurement conditions during the active state of the timer to avoid ping-pong switching or redirection.

[0199] The initiating component 1016 can perform a handover or redirection to a third network node based at least in part on the ping-pong handover or redirection not being avoided by applying one or more other measurement conditions, or changing the measurement condition threshold.

[0200] Fig.10 The number and arrangement of components shown are provided as examples. In practice, there may be Fig.10 Additional components, fewer components, different components, or components arranged in a different manner than those shown. Fig.10 Two or more components shown may be implemented in a single component, or Fig.10 The single component shown may be implemented as multiple distributed components. Additionally or alternatively, Fig.10 The illustrated set (one or more) of components may be described as being executable by Fig.10 Another group of components shown performs one or more functions.

[0201] The following provides an overview of some aspects of the disclosure:

[0202] Aspect 1: A method of wireless communication performed by a user equipment (UE), comprising: comparing an external list of ping-pong switches or redirections maintained by an access point and an internal list of ping-pong switches or redirections maintained by the UE; and identifying a ping-pong detection criterion for a switch or redirection between a first network node and a second network node based at least in part on the external list indicating a previous ping-pong switch or redirection between the first network node and the second network node, the internal list indicating a previous ping-pong switch or redirection between the first network node and the second network node, the external list and the internal list both indicating a previous ping-pong switch or redirection between the first network node and the second network node, or neither the external list nor the internal list indicating a previous ping-pong switch or redirection between the first network node and the second network node.

[0203] Aspect 2: A method according to Aspect 1, wherein identifying the ping-pong detection criterion includes: identifying a first ping-pong detection criterion at least in part based on both the external list and the internal list indicating the previous ping-pong switch or redirection between the first network node and the second network node; identifying a second ping-pong detection criterion at least in part based on only one of the external list or the internal list indicating the previous ping-pong switch or redirection between the first network node and the second network node; or identifying a third ping-pong detection criterion at least in part based on neither the external list nor the internal list indicating the previous ping-pong switch or redirection between the first network node and the second network node.

[0204] Aspect 3: The method according to aspect 2, wherein the first ping-pong detection criteria indicates identifying a ping-pong handover or redirection condition based at least in part on a single handover or redirection occurring between the first network node and the second network node.

[0205] Aspect 4: The method according to Aspect 3 also includes detecting the occurrence of the single handover or redirection between the first network node and the second network node, and indicating the cell and frequency of the first network node and the cell and frequency of the second network node in the internal list as a ping-pong handover or redirection combination based at least in part on detecting the occurrence of the single handover or redirection.

[0206] Aspect 5: The method according to aspect 2, wherein the second ping-pong detection criteria indicates that a ping-pong handover or redirection condition is identified based at least in part on two or more handovers or redirections occurring between the first network node and the second network node within a certain time period.

[0207] Aspect 6: The method according to Aspect 5 also includes detecting that the two or more handovers or redirections occur between the first network node and the second network node within the time period, and indicating the cell and frequency of the first network node and the cell and frequency of the second network node in the internal list as a ping-pong handover or redirection combination based at least in part on detecting that the two or more handovers or redirections occur within the time period.

[0208] Aspect 7: The method according to aspect 2, wherein the third ping-pong detection criteria indicates that a ping-pong handover or redirection condition is identified based at least in part on four or more handovers or redirections occurring between the first network node and the second network node within a certain time period.

[0209] Aspect 8: The method according to Aspect 7 also includes detecting that the four or more handovers or redirections occur between the first network node and the second network node within the time period, and indicating the cell and frequency of the first network node and the cell and frequency of the second network node in the internal list as a ping-pong handover or redirection combination based at least in part on detecting that the four or more handovers occur within the time period.

[0210] Aspect 9: A method according to any one of Aspects 1 to 8, wherein the first network node is a Long Term Evolution (LTE)-based network node or a New Radio (NR)-based network node, and the second network node is the other of the LTE-based network node or the NR-based network node.

[0211] Aspect 10: A method of wireless communication performed by a user equipment (UE), comprising: obtaining a configuration indicating one or more measurement conditions associated with a reporting event; obtaining an indication that the reporting event is associated with a switch or redirection between a first network node and a second network node; obtaining an indication that the switch or redirection between the first network node and the second network node is a ping-pong switch or redirection; and applying one or more other measurement conditions to avoid the ping-pong switch or redirection.

[0212] Aspect 11: The method according to aspect 10, further comprising determining not to perform the ping-pong switch or redirection based at least in part on applying the one or more other measurement conditions.

[0213] Aspect 12: A method according to any one of Aspects 10 to 11, wherein obtaining the indication that the handover or redirection between the first network node and the second network node is a ping-pong handover or redirection includes determining that a time interval between the reporting event and the handover or redirection is less than a threshold time interval.

[0214] Aspect 13: The method according to any one of aspects 10 to 12, wherein the one or more other measurement conditions are more stringent than the one or more measurement conditions.

[0215] Aspect 14: The method according to any one of aspects 10 to 13, wherein the one or more other measurement conditions are associated with another reporting event.

[0216] Aspect 15: The method according to aspect 14, wherein the reporting event is a B1 reporting event and the another reporting event is an internal B2 reporting event.

[0217] Aspect 16: The method according to aspect 14 further includes: initiating a timer associated with the reporting event; and applying the one or more other measurement conditions during an active state of the timer to avoid the ping-pong switch or redirection.

[0218] Aspect 17: A method according to Aspect 14, wherein the one or more other measurement conditions include a reference signal received power (RSRP) threshold, a reference signal received quality (RSRQ) threshold, or a signal to interference plus noise ratio (SINR) threshold, which are respectively greater than the RSRP measurement, RSRQ measurement, or SINR measurement of the second network node.

[0219] Aspect 18: A method according to Aspect 14, wherein the one or more other measurement conditions include a reference signal received power (RSRP) threshold, a reference signal received quality (RSRQ) threshold, or a signal to interference plus noise ratio (SINR) threshold, which are respectively less than the RSRP measurement, RSRQ measurement, or SINR measurement of the first network node.

[0220] Aspect 19: A method according to any one of aspects 10 to 18, wherein the reporting event is an A2 reporting event.

[0221] Aspect 20: The method according to aspect 19 further includes: initiating a timer associated with the reporting event; and applying the one or more other measurement conditions during an active state of the timer to avoid the ping-pong switch or redirection.

[0222] Aspect 21: A method according to Aspect 19, wherein the one or more other measurement conditions include a reference signal received power (RSRP) threshold, a reference signal received quality (RSRQ) threshold, or a signal to interference plus noise ratio (SINR) threshold, which are respectively less than the lowest RSRP measurement, the lowest RSRQ measurement, or the lowest SINR measurement of the second network node.

[0223] Aspect 22: The method according to any one of aspects 10 to 21 further comprises performing a handover or redirection to a third network node, or changing a measurement condition threshold, based at least in part on the ping-pong handover or redirection not being avoided by applying the one or more other measurement conditions.

[0224] Aspect 23: The method according to aspect 22, wherein the third network node is not associated with a previous handover or redirection condition.

[0225] Aspect 24: An apparatus for wireless communication at a device, comprising: a processor; a memory coupled to the processor; and instructions stored in the memory and executable by the processor to cause the apparatus to perform one or more of the methods described in Aspects 1 to 9.

[0226] Aspect 25: An apparatus for wireless communication, comprising a memory and one or more processors coupled to the memory, the one or more processors configured to perform the method according to one or more of aspects 1 to 9.

[0227] Aspect 26: An apparatus for wireless communication, comprising at least one means for performing the method according to one or more of aspects 1 to 9.

[0228] Aspect 27: A non-transitory computer-readable medium storing code for wireless communication, the code comprising instructions executable by a processor to perform the method according to one or more of aspects 1 to 9.

[0229] Aspect 28: A non-transitory computer-readable medium storing an instruction set for wireless communication, the instruction set comprising one or more instructions that, when executed by one or more processors of a device, cause the device to perform one or more of the methods described in aspects 1 to 9.

[0230] Aspect 29: An apparatus for wireless communication at a device, comprising: a processor; a memory coupled to the processor; and instructions stored in the memory and executable by the processor to cause the apparatus to perform one or more of the methods described in aspects 10 to 23.

[0231] Aspect 30: An apparatus for wireless communication, comprising a memory and one or more processors coupled to the memory, the one or more processors configured to perform the method according to one or more of aspects 10 to 23.

[0232] Aspect 31: An apparatus for wireless communication, comprising at least one means for performing the method according to one or more of aspects 10 to 23.

[0233] Aspect 32: A non-transitory computer-readable medium storing code for wireless communication, the code comprising instructions executable by a processor to perform the method according to one or more of aspects 10 to 23.

[0234] Aspect 33: A non-transitory computer-readable medium storing an instruction set for wireless communication, the instruction set comprising one or more instructions that, when executed by one or more processors of a device, cause the device to perform one or more of the methods described in aspects 10 to 23.

[0235] While the foregoing disclosure provides illustration and description, it is not intended to be exhaustive or to limit the aspects to the precise forms disclosed. Modifications and variations are possible in light of the above disclosure or may be acquired from practice of these aspects.

[0236] As used herein, the term "component" is intended to be broadly interpreted as hardware, and / or a combination of hardware and software. Whether referred to as software, firmware, middleware, microcode, hardware description language or other names, "software" should be broadly interpreted as meaning instructions, instruction sets, codes, code segments, program codes, programs, subroutines, software modules, applications, software applications, software packages, routines, subroutines, objects, executable files, threads implemented, processes and / or functions, etc. As used herein, "processors" are implemented in hardware and / or a combination of hardware and software. It will be clear that the systems and / or methods described herein can be implemented by different forms of hardware and / or a combination of hardware and software. The actual dedicated control hardware or software code used to implement these systems and / or methods does not limit various aspects. Therefore, the operation and behavior of the systems and / or methods are not described herein with reference to specific software codes, because those skilled in the art will understand that software and hardware can be designed to implement the systems and / or methods based at least in part on the description herein.

[0237] As used herein, "satisfying a threshold" may refer to a value being greater than a threshold, greater than or equal to a threshold, less than a threshold, less than or equal to a threshold, equal to a threshold, not equal to a threshold, etc., depending on the context.

[0238] Although specific combinations of features are set forth in the claims and / or disclosed in the specification, these combinations are not intended to limit the disclosure of various aspects. Many of these features can be combined in a manner that is not specifically described in the claims and / or is not disclosed in the specification. The disclosure of various aspects includes each dependent claim combined with each other claim in the claim set. As used herein, the phrase "at least one of" the list of items refers to any combination of these items (which includes a single member). As an example, "at least one of a, b or c" is intended to cover a, b, c, a+b, a+c, b+c and a+b+c, as well as any combination with multiple identical elements (e.g., a+a, a+a+a, a+a+b, a+a+c, a+b+b, a+c+c, b+b, b+b+b, b+b+c, c+c and c+c+c, or any other ordering of a, b and c).

[0239] Any element, action or instruction used herein should not be interpreted as critical or essential unless explicitly stated as such. In addition, as used herein, the articles "a" and "a kind of" are intended to include one or more items and can be used interchangeably with "one or more". In addition, as used herein, the article "said" is intended to include one or more items connected to the article "said" and can be used interchangeably with "one or more". In addition, as used herein, the terms "set" and "group" are intended to include one or more items and can be used interchangeably with "one or more". If only one item is intended to be referred to, the phrase "only one" or similar terms will be used. In addition, as used herein, the terms "having" and the like are intended to be open terms that do not limit the elements they modify (e.g., an element "having" A may also have B). In addition, the phrase "based on" is intended to mean "based at least in part on", unless explicitly stated otherwise. Furthermore, as used herein, the term "or" when used in a series is intended to be open-ended and used interchangeably with "and / or" unless expressly stated otherwise (eg, if used in conjunction with "either" or "only one of").

Claims

1. An apparatus for wireless communication at a user equipment (UE), comprising: Memory; and one or more processors coupled to the memory, the one or more processors configured to: comparing an external list of ping-pong handovers or redirections maintained by an access point with an internal list of ping-pong handovers or redirections maintained by the UE; as well as A ping-pong detection criterion is identified for a handover or redirection between the first network node and the second network node based at least in part on the external list indicating a previous ping-pong handover or redirection between the first network node and the second network node, the internal list indicating a previous ping-pong handover or redirection between the first network node and the second network node, the external list and the internal list both indicating a previous ping-pong handover or redirection between the first network node and the second network node, or neither the external list nor the internal list indicates a previous ping-pong handover or redirection between the first network node and the second network node.

2. The apparatus of claim 1 , wherein to identify the ping-pong detection criteria, the one or more processors are configured to: identifying a first ping-pong detection criterion based at least in part on both the external list and the internal list indicating the previous ping-pong handover or redirection between the first network node and the second network node; identifying a second ping-pong detection criterion based at least in part on only one of the external list or the internal list indicating the previous ping-pong handover or redirection between the first network node and the second network node; or A third ping-pong detection criterion is identified based at least in part on both the external list and the internal list not indicating the previous ping-pong handover or redirection between the first network node and the second network node.

3. The apparatus of claim 2, wherein the first ping-pong detection criteria indicates identifying a ping-pong handover or redirection condition based at least in part on a single handover or redirection occurring between the first network node and the second network node.

4. The apparatus of claim 3, wherein the one or more processors are further configured to: detecting that the single handover or redirection between the first network node and the second network node occurs; and The cell and frequency of the first network node and the cell and frequency of the second network node are indicated in the internal list as a ping-pong handover or redirection combination based at least in part on detecting that the single handover or redirection occurs.

5. The apparatus of claim 2, wherein the second ping-pong detection criteria indicates identifying a ping-pong handover or redirection condition based at least in part on two or more handovers or redirections occurring between the first network node and the second network node within a period of time.

6. The apparatus of claim 5, wherein the one or more processors are further configured to: detecting that the two or more handovers or redirections between the first network node and the second network node occur within the time period; and Indicating the cell and frequency of the first network node and the cell and frequency of the second network node in the internal list as a ping-pong handover or redirection combination based at least in part on detecting the two or more handovers or redirections occur within the time period.

7. The apparatus of claim 2, wherein the third ping-pong detection criteria indicates identifying a ping-pong handover or redirection condition based at least in part on four or more handovers or redirections occurring between the first network node and the second network node within a time period.

8. The apparatus of claim 7, wherein the one or more processors are further configured to: detecting that the four or more handovers or redirections occur between the first network node and the second network node within the time period; and The cell and frequency of the first network node and the cell and frequency of the second network node are indicated in the internal list as a ping-pong handover or redirection combination based at least in part on detecting the four or more handover occurrences within the time period.

9. The apparatus of claim 1 , wherein the first network node is a Long Term Evolution (LTE) based network node or a New Radio (NR) based network node, and the second network node is the other of the LTE based network node or the NR based network node.

10. An apparatus for wireless communication at a user equipment (UE), comprising: Memory; and one or more processors coupled to the memory, the one or more processors configured to: Obtaining a configuration indicating one or more measurement conditions associated with a reporting event; obtaining an indication that the reporting event is associated with a handover or redirection between a first network node and a second network node; obtaining an indication that the handover or redirection between the first network node and the second network node is a ping-pong handover or redirection; as well as One or more other measurement conditions are applied to avoid the ping-pong switching or redirection.

11. The apparatus of claim 10, wherein the one or more processors are further configured to determine not to perform the ping-pong switch or redirection based at least in part on applying the one or more other measurement conditions.

12. The apparatus of claim 10, wherein in order to obtain the indication that the handover or redirection between the first network node and the second network node is a ping-pong handover or redirection, the one or more processors are configured to determine that a time interval between the reporting event and the handover or redirection is less than a threshold time interval.

13. The apparatus of claim 10, wherein the one or more other measurement conditions are more stringent than the one or more measurement conditions. The apparatus of claim 10 , wherein the one or more other measurement conditions are associated with another reporting event.

15. The apparatus of claim 14, wherein the reporting event is a B1 reporting event and the another reporting event is an internal B2 reporting event.

16. The apparatus of claim 14, wherein the one or more processors are further configured to: Initiating a timer associated with the reporting event; and The one or more other measurement conditions are applied during an active state of the timer to avoid the ping-pong switching or redirection.

17. The apparatus of claim 14, wherein the one or more other measurement conditions include a reference signal received power (RSRP) threshold, a reference signal received quality (RSRQ) threshold, or a signal to interference plus noise ratio (SINR) threshold, and the reference signal received power (RSRP) threshold, the reference signal received quality (RSRQ) threshold, or the signal to interference plus noise ratio (SINR) threshold is greater than the RSRP measurement, RSRQ measurement, or SINR measurement of the second network node, respectively.

18. The apparatus of claim 14, wherein the one or more other measurement conditions include a reference signal received power (RSRP) threshold, a reference signal received quality (RSRQ) threshold, or a signal to interference plus noise ratio (SINR) threshold, and the reference signal received power (RSRP) threshold, the reference signal received quality (RSRQ) threshold, or the signal to interference plus noise ratio (SINR) threshold is less than the RSRP measurement, RSRQ measurement, or SINR measurement of the first network node, respectively.

19. The apparatus of claim 14, wherein the reporting event is an A2 reporting event.

20. The apparatus of claim 19, wherein the one or more processors are further configured to: Initiating a timer associated with the reporting event; and The one or more other measurement conditions are applied during an active state of the timer to avoid the ping-pong switching or redirection.

21. The apparatus of claim 19, wherein the one or more other measurement conditions include a reference signal received power (RSRP) threshold, a reference signal received quality (RSRQ) threshold, or a signal to interference plus noise ratio (SINR) threshold, and the reference signal received power (RSRP) threshold, the reference signal received quality (RSRQ) threshold, or the signal to interference plus noise ratio (SINR) threshold is less than a lowest RSRP measurement, a lowest RSRQ measurement, or a lowest SINR measurement of the second network node, respectively.

22. The apparatus of claim 10, wherein the one or more processors are further configured to perform a handover or redirection to a third network node, or change a measurement condition threshold, based at least in part on the ping-pong handover or redirection not being avoided by applying the one or more other measurement conditions.

23. The apparatus of claim 22, wherein the third network node is not associated with a previous handover or redirection condition.

24. A method of wireless communication performed by a user equipment (UE), comprising: comparing an external list of ping-pong handovers or redirections maintained by an access point with an internal list of ping-pong handovers or redirections maintained by the UE; as well as A ping-pong detection criterion is identified for a handover or redirection between the first network node and the second network node based at least in part on the external list indicating a previous ping-pong handover or redirection between the first network node and the second network node, the internal list indicating a previous ping-pong handover or redirection between the first network node and the second network node, the external list and the internal list both indicating a previous ping-pong handover or redirection between the first network node and the second network node, or neither the external list nor the internal list indicates a previous ping-pong handover or redirection between the first network node and the second network node.

25. The method of claim 24, wherein identifying the ping-pong detection criteria comprises: identifying a first ping-pong detection criterion based at least in part on both the external list and the internal list indicating the previous ping-pong handover or redirection between the first network node and the second network node; identifying a second ping-pong detection criterion based at least in part on only one of the external list or the internal list indicating the previous ping-pong handover or redirection between the first network node and the second network node; or A third ping-pong detection criterion is identified based at least in part on both the external list and the internal list not indicating the previous ping-pong handover or redirection between the first network node and the second network node.

26. The method of claim 25, wherein the first ping-pong detection criteria indicates identifying a ping-pong handover or redirection condition based at least in part on a single handover or redirection occurring between the first network node and the second network node.

27. The method of claim 25, wherein the second ping-pong detection criteria indicates identification of a ping-pong handover or redirection condition based at least in part on two or more handovers or redirections occurring between the first network node and the second network node within a time period.

28. The method of claim 25, wherein the third ping-pong detection criteria indicates identification of a ping-pong handover or redirection condition based at least in part on four or more handovers or redirections occurring between the first network node and the second network node within a time period.

29. A method of wireless communication performed by a user equipment (UE), comprising: obtaining a configuration indicating one or more measurement conditions associated with a reporting event; obtaining an indication that the reporting event is associated with a handover or redirection between the first network node and the second network node; obtaining an indication that the handover or redirection between the first network node and the second network node is a ping-pong handover or redirection; as well as One or more other measurement conditions are applied to avoid the ping-pong switching or redirection.

30. The method of claim 29, further comprising determining not to perform the ping-pong switch or redirection based at least in part on applying the one or more other measurement conditions.

31. The method of claim 29, wherein obtaining the indication that the handover or redirection between the first network node and the second network node is a ping-pong handover or redirection comprises determining that a time interval between the reporting event and the handover or redirection is less than a threshold time interval.

32. The method of claim 29, wherein the one or more other measurement conditions are more stringent than the one or more measurement conditions.

33. The method of claim 29, wherein the one or more other measurement conditions are associated with another reporting event.

34. The method of claim 33, wherein the reporting event is a B1 reporting event and the another reporting event is an internal B2 reporting event.

35. The method of claim 33, wherein the reporting event is an A2 reporting event.

Images