Radio link failure prediction in dual connection
By configuring UE to predict and report SCG RLF, the network node can proactively manage radio link failures, enhancing communication reliability and reducing signaling overhead in dual connection wireless networks.
Patent Information
- Application Number
- PCT/CN2024/112191
- Authority / Receiving Office
- WO · WO
- Patent Type
- Applications
- Current Assignee / Owner
- Filing Date
- 2024-08-14
- Publication Date
- 2025-07-17
AI Technical Summary
Radio link failures (RLF) in dual connection (DC) scenarios are not adequately predicted, leading to communication disruptions and inefficiencies in wireless networks.
A network node transmits a configuration for secondary cell group (SCG) RLF prediction to user equipment (UE), which performs the prediction and sends the results back to the network node, allowing for proactive switching and reducing signaling overhead.
Enhances RLF prediction accuracy and reduces signaling overhead by enabling timely switching between secondary nodes, thereby improving communication reliability in dual connection scenarios.
Smart Images

Figure CN2024112191_17072025_PF_FP_ABST
Abstract
Description
RADIO LINK FAILURE PREDICTION IN DUAL CONNECTIONTECHNICAL FIELD
[0001] The present disclosure relates to wireless communications, and more specifically to network node, user equipment (UE) and methods for supporting radio link failure (RLF) prediction in dual connection (DC) .BACKGROUND
[0002] A wireless communications system may include one or multiple network communication devices, such as base stations, which may be otherwise known as an eNodeB (eNB) , a next-generation NodeB (gNB) , or other suitable terminology. Each network communication devices, such as a base station may support wireless communications for one or multiple user communication devices, which may be otherwise known as user equipment (UE) , or other suitable terminology. The wireless communications system may support wireless communications with one or multiple user communication devices by utilizing resources of the wireless communication system (e.g., time resources (e.g., symbols, slots, subframes, frames, or the like) or frequency resources (e.g., subcarriers, carriers) . Additionally, the wireless communications system may support wireless communications across various radio access technologies including third generation (3G) radio access technology, fourth generation (4G) radio access technology, fifth generation (5G) radio access technology, among other suitable radio access technologies beyond 5G (e.g., sixth generation (6G) ) .
[0003] A radio link between a network node and a UE is not always stable, and RLF may occur, which has a negative impact on the communication procedure. It is advantageous to predict the RLF in advance.SUMMARY
[0004] The present disclosure relates to network node, UE and methods that support RLF prediction in DC. With the network node, UE and methods, secondary cell group (SCG) RLF prediction in DC scenarios may be achieved.
[0005] Some implementations of a network node described herein may include a processor and a transceiver coupled to the processor, wherein the processor is configured to:transmit, via the transceiver to a UE, a configuration for SCG RLF prediction; and receive at least one result of the SCG RLF prediction via the transceiver from the UE.
[0006] In some implementations, the configuration for SCG RLF prediction comprises a first time window or a first time instance where a result of the SCG RLF prediction is to be applied.
[0007] In some implementations, the configuration for SCG RLF prediction comprises multiple time windows or multiple time instances where multiple results of the SCG RLF prediction are to be applied.
[0008] In some implementations, the processor is configured to receive the at least one result of the SCG RLF prediction together with a first indication, wherein the first indication indicates that the at least one result of the RLF prediction is for an SCG.
[0009] In some implementations, the network node comprises a master node (MN) .
[0010] In some implementations, the processor is further configured to: initiate switching from a source secondary node (SN) to a target SN based on the at least one result of the SCG RLF prediction.
[0011] In some implementations, the processor is configured to initiate switching from the source SN to the target SN by transmitting at least one of the following via the transceiver to the target SN: the at least one result of the SCG RLF prediction, or predicted measurement results related to the target SN.
[0012] In some implementations, the processor is configured to initiate switching from the source SN to the target SN by: transmitting, via the transceiver to the source SN, a request for releasing the source SN, wherein the request comprises the at least one result of the SCG RLF prediction.
[0013] In some implementations, the request further comprises a cause value indicating it is predicted that RLF will occur in a primary secondary cell (PSCell) .
[0014] In some implementations, the processor is further configured to: transmit at least one of the following via the transceiver to a serving SN: the at least one result of the SCG RLF prediction, or predicted measurement results related to a target SN.
[0015] In some implementations, the processor is configured to transmit the at least one of the following via a request message: the at least one result of the SCG RLF prediction, or the predicted measurement results related to the target SN.
[0016] In some implementations, the network node comprises a SN.
[0017] In some implementations, the processor is further configured to: receive capability information about the UE via the transceiver from an MN. In such implementations, the processor is configured to transmit the configuration for SCG RLF prediction based on the capability information.
[0018] In some implementations, the processor is configured to transmit the configuration for SCG RLF prediction by transmitting, via the transceiver to the UE, the configuration for SCG RLF prediction via a master cell group (MCG) link or an SCG link.
[0019] In some implementations, the processor is configured to receive the at least one result of the SCG RLF prediction by: receiving, via the transceiver from the UE, the at least one result of the SCG RLF prediction via an MCG link or an SCG link.
[0020] In some implementations, the processor is further configured to: determine a candidate PSCell for the UE based on the at least one result of the SCG RLF prediction.
[0021] In some implementations, the processor is further configured to: transmit a required message via the transceiver to a MN, wherein the required message comprises a third indication indicating it is predicted that RLF will occur in a PSCell.
[0022] In some implementations, the required message comprises a cause value indicating it is predicted that RLF will occur in the PSCell.
[0023] In some implementations, the processor is further configured to: transmit the at least one result of the SCG RLF prediction via the transceiver to a MN.
[0024] Some implementations of a UE described herein may include a processor and a transceiver coupled to the processor, wherein the processor is configured to: receive, via the transceiver from a network node, a configuration for SCG RLF prediction; perform the SCG RLF prediction based on the configuration; and transmit at least one result of the SCG RLF prediction via the transceiver to the network node.
[0025] In some implementations, the processor is configured to receive the configuration for SCG RLF prediction via an MCG link or an SCG link.
[0026] In some implementations, the configuration for SCG RLF prediction comprises a first time window or a first time instance where a result of the SCG RLF prediction is to be applied.
[0027] In some implementations, the processor is further configured to: after receiving the configuration for SCG RLF prediction, receive a second configuration for SCG RLF prediction via the transceiver from the network node, wherein the second configuration comprises a second time window or a second time instance where the result of the SCG RLF prediction is to be applied; and overwrite the first time window or the first time instance with the second time window or the second time instance.
[0028] In some implementations, the configuration for SCG RLF prediction comprises multiple time windows or multiple time instances where multiple results of the SCG RLF prediction are to be applied.
[0029] In some implementations, the processor is configured to transmit the at least one result of the SCG RLF prediction together with a first indication, wherein the first indication indicates that the at least one result of the RLF prediction is for an SCG.
[0030] In some implementations, the processor is configured to transmit the at least one result of the SCG RLF prediction by: transmitting, via the transceiver to the network node, the at least one result of the SCG RLF prediction via an MCG link or an SCG link.
[0031] Some implementations of a method described herein may include: transmitting, to a UE, a configuration for SCG RLF prediction; and receiving at least one result of the SCG RLF prediction from the UE.
[0032] Some implementations of a method described herein may include: receiving, from a network node, a configuration for SCG RLF prediction; performing the SCG RLF prediction based on the configuration; and transmitting at least one result of the SCG RLF prediction to the network node.
[0033] Some implementations of a processor described herein may include at least one memory and a controller coupled with the at least one memory and configured to cause the controller to: receive, via the transceiver from a network node, a configuration for SCG RLF prediction; perform the SCG RLF prediction based on the configuration; and transmit at least one result of the SCG RLF prediction via the transceiver to the network node.
[0034] It is to be understood that the summary section is not intended to identify key or essential features of embodiments of the present disclosure, nor is it intended to be used to limit the scope of the present disclosure. Other features of the present disclosure will become easily comprehensible through the following description.BRIEF DESCRIPTION OF THE DRAWINGS
[0035] Fig. 1 illustrates an example of a wireless communications system that supports RLF prediction in DC in accordance with aspects of the present disclosure;
[0036] Fig. 2 illustrates another example of a wireless communications system that supports RLF prediction in DC in accordance with aspects of the present disclosure;
[0037] Figs. 3 to 7 illustrate a signaling diagram illustrating an example process that supports RLF prediction in DC in accordance with aspects of the present disclosure, respectively;
[0038] Fig. 8 illustrates an example of a device that supports RLF prediction in DC in accordance with some aspects of the present disclosure;
[0039] Fig. 9 illustrates an example of a processor that supports RLF prediction in DC in accordance with aspects of the present disclosure; and
[0040] Figs. 10 and 11 illustrate a flowchart of a method that supports RLF prediction in DC in accordance with aspects of the present disclosure, respectively.DETAILED DESCRIPTION
[0041] Principles of the present disclosure will now be described with reference to some embodiments. It is to be understood that these embodiments are described only for the purpose of illustration and help those skilled in the art to understand and implement the present disclosure, without suggesting any limitation as to the scope of the disclosure. The disclosure described herein may be implemented in various manners other than the ones described below.
[0042] In the following description and claims, unless defined otherwise, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skills in the art to which this disclosure belongs.
[0043] References in the present disclosure to “one embodiment, ” “an example embodiment, ” “an embodiment, ” “some embodiments, ” and the like indicate that the embodiment (s) described may include a particular feature, structure, or characteristic, but it is not necessary that every embodiment includes the particular feature, structure, or characteristic. Moreover, such phrases do not necessarily refer to the same embodiment (s) . Further, when a particular feature, structure, or characteristic is described in connection with an embodiment, it is submitted that it is within the knowledge of one skilled in the art to affect such feature, structure, or characteristic in connection with other embodiments whether or not explicitly described.
[0044] It shall be understood that although the terms “first” and “second” or the like may be used herein to describe various elements, these elements should not be limited by these terms. These terms are only used to distinguish one element from another element. For example, a first element could also be termed as a second element, and similarly, a second element could also be termed as a first element, without departing from the scope of embodiments. As used herein, the term “and / or” includes any and all combinations of one or more of the listed terms.
[0045] The terminology used herein is for the purpose of describing particular embodiments only and is not intended to be limiting of example embodiments. As used herein, the singular forms “a” , “an” and “the” are intended to include the plural forms as well, unless the context clearly indicates otherwise. It will be further understood that the terms “comprises” , “comprising” , “has” , “having” , “includes” and / or “including” , when used herein, specify the presence of stated features, elements, and / or components etc., but do not preclude the presence or addition of one or more other features, elements, components and / or combinations thereof.
[0046] RLF occurs when the radio link between a network node and a UE is lost. This can happen due to various reasons. For example, a UE can declare RLF when one of the following criteria are met:
[0047] - Expiry of a radio problem timer started after indication of radio problems from the physical layer (if radio problems are recovered before the timer is expired, the UE stops the timer) ; or
[0048] - Expiry of a timer started upon triggering a measurement report for a measurement identity for which the timer has been configured while another radio problem timer is running; or
[0049] - Random access procedure failure; or
[0050] - RLC failure; or
[0051] - Detection of consistent uplink LBT failures for operation with shared spectrum channel access; or
[0052] - For IAB-MT, the reception of a BH RLF indication received from its parent node.
[0053] In DC scenarios, both MCG RLF prediction and SCG RLF prediction may be supported. It needs to study how to configure the RLF prediction for MCG and / or SCG and how to report at least one result of RLF prediction for MCG and / or SCG.
[0054] In view of the above, the present disclosure provides a solution that supports RLF prediction in DC. In this solution, a network node transmits, to a UE, a configuration for SCG RLF prediction. In turn, the network node receives at least one result of the SCG RLF prediction from the UE. It is the network node (e.g., master node or secondary node) transmitting the configuration for SCG RLF prediction to the UE that receives the at least one result of the SCG RLF prediction from the UE. Thus, the network node does not need to explicitly indicate the UE to which node to transmit the result of the SCG RLF prediction. In this way, signaling overhead may be reduced.
[0055] Aspects of the present disclosure are described in the context of a wireless communications system.
[0056] Fig. 1 illustrates an example of a wireless communications system 100 that supports RLF prediction in DC in accordance with aspects of the present disclosure. The wireless communications system 100 may include one at least one of network entities 102 (also referred to as network equipment (NE) ) , one or more terminal devices or UEs 104, a core network 106, and a packet data network 108. The wireless communications system 100 may support various radio access technologies. In some implementations, the wireless communications system 100 may be a 4G network, such as an LTE network or an LTE-advanced (LTE-A) network. In some other implementations, the wireless communications system 100 may be a 5G network, such as an NR network. In other implementations, the wireless communications system 100 may be a combination of a 4G network and a 5G network, or other suitable radio access technology including institute of electrical and electronics engineers (IEEE) 802.11 (Wi-Fi) , IEEE 802.16 (WiMAX) , IEEE 802.20. The wireless communications system 100 may support radio access technologies beyond 5G. Additionally, the wireless communications system 100 may support technologies, such as time division multiple access (TDMA) , frequency division multiple access (FDMA) , or code division multiple access (CDMA) , etc.
[0057] The network entities 102 may be dispersed throughout a geographic region to form the wireless communications system 100. One or more of the network entities 102 described herein may be or include or may be referred to as a network node, a base station (BS) , a network element, a radio access network (RAN) node, a base transceiver station, an access point, a NodeB, an eNodeB (eNB) , a next-generation NodeB (gNB) , or other suitable terminology. A network entity 102 and a UE 104 may communicate via a communication link 110, which may be a wireless or wired connection. For example, a network entity 102 and a UE 104 may perform wireless communication (e.g., receive signaling, transmit signaling) over a Uu interface. The network entities 102 may be collectively referred to as network entities 102 or individually referred to as a network entity 102. Hereinafter, some implementations of the present disclosure will be described by taking a network node and gNB as examples of the network entity 102. Thus, the network entity 102 may be used interchangeably with the network node 102 and the gNB 102.
[0058] A network entity 102 may provide a geographic coverage area 112 for which the network entity 102 may support services (e.g., voice, video, packet data, messaging, broadcast, etc. ) for one or more UEs 104 within the geographic coverage area 112. For example, a network entity 102 and a UE 104 may support wireless communication of signals related to services (e.g., voice, video, packet data, messaging, broadcast, etc. ) according to one or multiple radio access technologies. In some implementations, a network entity 102 may be moveable, for example, a satellite associated with a non-terrestrial network. In some implementations, different geographic coverage areas 112 associated with the same or different radio access technologies may overlap, but the different geographic coverage areas 112 may be associated with different network entities 102. Information and signals described herein may be represented using any of a variety of different technologies and techniques. For example, data, instructions, commands, information, signals, bits, symbols, and chips that may be referenced throughout the description may be represented by voltages, currents, electromagnetic waves, magnetic fields or particles, optical fields or particles, or any combination thereof.
[0059] The one or more UEs 104 may be dispersed throughout a geographic region of the wireless communications system 100. A UE 104 may include or may be referred to as a mobile device, a wireless device, a remote device, a remote unit, a handheld device, or a subscriber device, or some other suitable terminology. In some implementations, the UE 104 may be referred to as a unit, a station, a terminal, or a client, among other examples. Additionally, or alternatively, the UE 104 may be referred to as an internet-of-things (IoT) device, an internet-of-everything (IoE) device, or machine-type communication (MTC) device, among other examples. In some implementations, a UE 104 may be stationary in the wireless communications system 100. In some other implementations, a UE 104 may be mobile in the wireless communications system 100.
[0060] The one or more UEs 104 may be devices in different forms or having different capabilities. Some examples of UEs 104 are illustrated in Fig. 1. A UE 104 may be capable of communicating with various types of devices, such as the network entities 102, other UEs 104, or network equipment (e.g., the core network 106, the packet data network 108, a relay device, an integrated access and backhaul (IAB) node, or another network equipment) , as shown in Fig. 1. Additionally, or alternatively, a UE 104 may support communication with other network entities 102 or UEs 104, which may act as relays in the wireless communications system 100.
[0061] A UE 104 may also be able to support wireless communication directly with other UEs 104 over a communication link 114. For example, a UE 104 may support wireless communication directly with another UE 104 over a device-to-device (D2D) communication link. In some implementations, such as vehicle-to-vehicle (V2V) deployments, vehicle-to-everything (V2X) deployments, or cellular-V2X deployments, the communication link 114 may be referred to as a sidelink. For example, a UE 104 may support wireless communication directly with another UE 104 over a PC5 interface.
[0062] A network entity 102 may support communications with the core network 106, or with another network entity 102, or both. For example, a network entity 102 may interface with the core network 106 through one or more backhaul links 116 (e.g., via an S1, N2, N3, or another network interface) . The network entities 102 may communicate with each other over the backhaul links 116 (e.g., via an X2, Xn, or another network interface) . In some implementations, the network entities 102 may communicate with each other directly (e.g., between the network entities 102) . In some other implementations, the network entities 102 may communicate with each other or indirectly (e.g., via the core network 106) . In some implementations, one or more network entities 102 may include subcomponents, such as an access network entity, which may be an example of an access node controller (ANC) . An ANC may communicate with the one or more UEs 104 through one or more other access network transmission entities, which may be referred to as a radio heads, smart radio heads, or transmission-reception points (TRPs) .
[0063] In some implementations, a network entity 102 may be configured in a disaggregated architecture, which may be configured to utilize a protocol stack physically or logically distributed among two or more network entities 102, such as an integrated access backhaul (IAB) network, an open radio access network (O-RAN) (e.g., a network configuration sponsored by the O-RAN Alliance) , or a virtualized RAN (vRAN) (e.g., a cloud RAN (C-RAN) ) . For example, a network entity 102 may include one or more of a CU, a DU, a radio unit (RU) , a RAN intelligent controller (RIC) (e.g., a near-real time RIC (Near-RT RIC) , a non-real time RIC (Non-RT RIC) ) , a service management and orchestration (SMO) system, or any combination thereof.
[0064] An RU may also be referred to as a radio head, a smart radio head, a remote radio head (RRH) , a remote radio unit (RRU) , or a transmission reception point (TRP) . One or more components of the network entities 102 in a disaggregated RAN architecture may be co-located, or one or more components of the network entities 102 may be located in distributed locations (e.g., separate physical locations) . In some implementations, one or more network entities 102 of a disaggregated RAN architecture may be implemented as virtual units (e.g., a virtual CU (VCU) , a virtual DU (VDU) , a virtual RU (VRU) ) .
[0065] Split of functionality between a CU, a DU, and an RU may be flexible and may support different functionalities depending upon which functions (e.g., network layer functions, protocol layer functions, baseband functions, radio frequency functions, and any combinations thereof) are performed at a CU, a DU, or an RU. For example, a functional split of a protocol stack may be employed between a CU and a DU such that the CU may support one or more layers of the protocol stack and the DU may support one or more different layers of the protocol stack. In some implementations, the CU may host upper protocol layer (e.g., an L3, an L2) functionality and signaling (e.g., radio resource control (RRC) , service data adaption protocol (SDAP) , packet data convergence protocol (PDCP) ) . The CU may be connected to one or more DUs or RUs, and the one or more DUs or RUs may host lower protocol layers, such as an L1 (e.g., physical (PHY) layer) or an L2 (e.g., radio link control (RLC) layer, medium access control (MAC) layer) functionality and signaling, and may each be at least partially controlled by the CU.
[0066] Additionally, or alternatively, a functional split of the protocol stack may be employed between a DU and an RU such that the DU may support one or more layers of the protocol stack and the RU may support one or more different layers of the protocol stack. The DU may support one or multiple different cells (e.g., via one or more RUs) . In some implementations, a functional split between a CU and a DU, or between a DU and an RU may be within a protocol layer (e.g., some functions for a protocol layer may be performed by one of a CU, a DU, or an RU, while other functions of the protocol layer are performed by a different one of the CU, the DU, or the RU) .
[0067] A CU may be functionally split further into CU control plane (CU-CP) and CU user plane (CU-UP) functions. A CU may be connected to one or more DUs via a midhaul communication link (e.g., F1, F1-c, F1-u) , and a DU may be connected to one or more RUs via a fronthaul communication link (e.g., open fronthaul (FH) interface) . In some implementations, a midhaul communication link or a fronthaul communication link may be implemented in accordance with an interface (e.g., a channel) between layers of a protocol stack supported by respective network entities 102 that are in communication via such communication links.
[0068] The core network 106 may support user authentication, access authorization, tracking, connectivity, and other access, routing, or mobility functions. The core network 106 may be an evolved packet core (EPC) , or a 5G core (5GC) , which may include a control plane entity that manages access and mobility (e.g., a mobility management entity (MME) , an access and mobility management functions (AMF) ) and a user plane entity that routes packets or interconnects to external networks (e.g., a serving gateway (S-GW) , a packet data network (PDN) gateway (P-GW) , or a user plane function (UPF) ) . In some implementations, the control plane entity may manage non-access stratum (NAS) functions, such as mobility, authentication, and bearer management (e.g., data bearers, signal bearers, etc. ) for the one or more UEs 104 served by the one or more network entities 102 associated with the core network 106.
[0069] The core network 106 may communicate with the packet data network 108 over one or more backhaul links 116 (e.g., via an S1, N2, N3, or another network interface) . The packet data network 108 may include an application server 118. In some implementations, one or more UEs 104 may communicate with the application server 118. A UE 104 may establish a session (e.g., a protocol data unit (PDU) session, or the like) with the core network 106 via a network entity 102. The core network 106 may route traffic (e.g., control information, data, and the like) between the UE 104 and the application server 118 using the established session (e.g., the established PDU session) . The PDU session may be an example of a logical connection between the UE 104 and the core network 106 (e.g., one or more network functions of the core network 106) .
[0070] In the wireless communications system 100, the network entities 102 and the UEs 104 may use resources of the wireless communications system 100 (e.g., time resources (e.g., symbols, slots, subframes, frames, or the like) or frequency resources (e.g., subcarriers, carriers) ) to perform various operations (e.g., wireless communications) . In some implementations, the network entities 102 and the UEs 104 may support different resource structures. For example, the network entities 102 and the UEs 104 may support different frame structures. In some implementations, such as in 4G, the network entities 102 and the UEs 104 may support a single frame structure. In some other implementations, such as in 5G and among other suitable radio access technologies, the network entities 102 and the UEs 104 may support various frame structures (i.e., multiple frame structures) . The network entities 102 and the UEs 104 may support various frame structures based on one or more numerologies.
[0071] One or more numerologies may be supported in the wireless communications system 100, and a numerology may include a subcarrier spacing and a cyclic prefix. A first numerology (e.g., μ=0) may be associated with a first subcarrier spacing (e.g., 15 kHz) and a normal cyclic prefix. In some implementations, the first numerology (e.g., μ=0) associated with the first subcarrier spacing (e.g., 15 kHz) may utilize one slot per subframe. A second numerology (e.g., μ=1) may be associated with a second subcarrier spacing (e.g., 30 kHz) and a normal cyclic prefix. A third numerology (e.g., μ=2) may be associated with a third subcarrier spacing (e.g., 60 kHz) and a normal cyclic prefix or an extended cyclic prefix. A fourth numerology (e.g., μ=3) may be associated with a fourth subcarrier spacing (e.g., 120 kHz) and a normal cyclic prefix. A fifth numerology (e.g., μ=4) may be associated with a fifth subcarrier spacing (e.g., 240 kHz) and a normal cyclic prefix.
[0072] A time interval of a resource (e.g., a communication resource) may be organized according to frames (also referred to as radio frames) . Each frame may have a duration, for example, a 10 millisecond (ms) duration. In some implementations, each frame may include multiple subframes. For example, each frame may include 10 subframes, and each subframe may have a duration, for example, a 1 ms duration. In some implementations, each frame may have the same duration. In some implementations, each subframe of a frame may have the same duration.
[0073] Additionally or alternatively, a time interval of a resource (e.g., a communication resource) may be organized according to slots. For example, a subframe may include a number (e.g., quantity) of slots. The number of slots in each subframe may also depend on the one or more numerologies supported in the wireless communications system 100. For instance, the first, second, third, fourth, and fifth numerologies (i.e., μ=0, μ=1, μ=2, μ=3, μ=4) associated with respective subcarrier spacings of 15 kHz, 30 kHz, 60 kHz, 120 kHz, and 240 kHz may utilize a single slot per subframe, two slots per subframe, four slots per subframe, eight slots per subframe, and 16 slots per subframe, respectively. Each slot may include a number (e.g., quantity) of symbols (e.g., OFDM symbols) . In some implementations, the number (e.g., quantity) of slots for a subframe may depend on a numerology. For a normal cyclic prefix, a slot may include 14 symbols. For an extended cyclic prefix (e.g., applicable for 60 kHz subcarrier spacing) , a slot may include 12 symbols. The relationship between the number of symbols per slot, the number of slots per subframe, and the number of slots per frame for a normal cyclic prefix and an extended cyclic prefix may depend on a numerology. It should be understood that reference to a first numerology (e.g., μ=0) associated with a first subcarrier spacing (e.g., 15 kHz) may be used interchangeably between subframes and slots.
[0074] In the wireless communications system 100, an electromagnetic (EM) spectrum may be split, based on frequency or wavelength, into various classes, frequency bands, frequency channels, etc. By way of example, the wireless communications system 100 may support one or multiple operating frequency bands, such as frequency range designations FR1 (410 MHz –7.125 GHz) , FR2 (24.25 GHz –52.6 GHz) , FR3 (7.125 GHz –24.25 GHz) , FR4 (52.6 GHz –114.25 GHz) , FR4a or FR4-1 (52.6 GHz –71 GHz) , and FR5 (114.25 GHz –300 GHz) . In some implementations, the network entities 102 and the UEs 104 may perform wireless communications over one or more of the operating frequency bands. In some implementations, FR1 may be used by the network entities 102 and the UEs 104, among other equipment or devices for cellular communications traffic (e.g., control information, data) . In some implementations, FR2 may be used by the network entities 102 and the UEs 104, among other equipment or devices for short-range, high data rate capabilities.
[0075] FR1 may be associated with one or multiple numerologies (e.g., at least three numerologies) . For example, FR1 may be associated with a first numerology (e.g., μ=0) , which includes 15 kHz subcarrier spacing; a second numerology (e.g., μ=1) , which includes 30 kHz subcarrier spacing; and a third numerology (e.g., μ=2) , which includes 60 kHz subcarrier spacing. FR2 may be associated with one or multiple numerologies (e.g., at least 2 numerologies) . For example, FR2 may be associated with a third numerology (e.g., μ=2) , which includes 60 kHz subcarrier spacing; and a fourth numerology (e.g., μ=3) , which includes 120 kHz subcarrier spacing.
[0076] Fig. 2 illustrates another example of a wireless communications system 200 that supports RLF prediction in DC in accordance with aspects of the present disclosure. As shown in Fig. 2, the wireless communications system 200 may comprise a first network node 210, a second network node 220 and the UE 104. The UE 104 is in dual connection (DC) with the first network node 210 and the second network node 220.
[0077] In some implementations, the first network node 210 may be implemented as a master node (MN) , and the second network node 220 may be implemented as a secondary node (SN) . Alternatively, the first network node 210 may be implemented as an SN, and the second network node 220 may be implemented as an MN.
[0078] In some implementations, the first network node 210 and the second network node 220 may be collectively implemented as one of the following: a gNB, a base station, a network element, a RAN node, a base transceiver station, an access point, a NodeB, or an eNB. For example, the first network node 210 and the second network node 220 may be collectively implemented as the gNB 102 in Fig. 1.
[0079] In some implementations, each of the first network node 210 and the second network node 220 may be implemented as a gNB-DU. In such implementations, the first network node 210 and the second network node 220 may be referred to as a gNB-DU 210 and a gNB-DU 220, respectively.
[0080] In some implementations, the gNB-CU may be a logical node hosting RRC, SDAP and PDCP protocols of the gNB or RRC and PDCP protocols of the en-gNB that controls the operation of one or more gNB-DUs. The gNB-CU terminates the F1 interface connected to the gNB-DU.
[0081] In some implementations, the gNB-DU may be a logical node hosting RLC, MAC and PHY layers of the gNB or en-gNB, and its operation is partly controlled by gNB-CU. One gNB-DU supports one or multiple cells. One cell is supported by only one gNB-DU. The gNB-DU terminates the F1 interface connected with the gNB-CU.
[0082] Alternatively, in some implementations, each of the first network node 210 and the second network node 220 may be implemented as one of the following: a gNB, a base station, a network element, a RAN node, a base transceiver station, an access point, a NodeB, or an eNB. For example, the first network node 210 and the second network node 220 may be implemented as the gNB 102-1 and 102-2 in Fig. 1, respectively.
[0083] Fig. 3 illustrates a signaling diagram illustrating an example process 300 that supports RLF prediction in DC in accordance with aspects of the present disclosure. The process 300 may involve the UE 104 and the network node 102 in Fig. 1.
[0084] As shown in Fig. 3, the network node 102 transmits 310 a configuration for SCG RLF prediction to the UE 104.
[0085] In some implementations, the configuration for SCG RLF prediction may comprise a first time window or a first time instance where a result of the SCG RLF prediction is to be applied.
[0086] In some implementations, multiple RLF predictions are not allowed to configure the UE 104 at the same time instance. In such implementations, after receiving the configuration for SCG RLF prediction, the UE 104 may receive a second configuration for SCG RLF prediction from the network node 102. The second configuration may comprise a second time window or a second time instance where the result of the SCG RLF prediction is to be applied. In such implementations, the UE 104 may overwrite the first time window or the first time instance with the second time window or overwrite the first time window or the first time instance with the second time instance. In other words, the UE 104 may only perform the SCG RLF prediction based on the second configuration for SCG RLF prediction.
[0087] In some implementations, multiple RLF predictions are allowed to configure the UE 104 at the same time instance. In such implementations, the configuration for SCG RLF prediction may comprise multiple time windows or multiple time instances where multiple results of the SCG RLF prediction are to be applied. The UE 104 may predict whether RLF will occur in a PSCell in each of the multiple time windows or at each of the multiple time instances.
[0088] In some implementations, the configuration for SCG RLF prediction may further comprise a threshold for SCG RLF prediction. For example, the threshold may comprise a threshold for a signal to interference plus noise ratio (SINR) of the PSCell of the UE 104. If SINR of the PSCell of the UE 104 is less than the threshold, the UE 104 may predict that RLF will occur in the PSCell in a time window or time instance.
[0089] In some implementations, the configuration for SCG RLF prediction may further comprise an indication indicating whether a direct RLF prediction or indirect RLF prediction is to be performed.
[0090] In some implementations, the indirect RLF prediction is an RLF prediction based on temporal domain serving cell measurement predictions (e.g., SINR) . If the indirect RLF prediction is used, the UE 104 needs to predict temporal domain serving cell measurement. Regarding temporal domain serving cell measurement, the UE 104 may predict measurement results based on actual current measurement results. If so, RS resource configuration should be configured. The UE 104 performs the indirect RLF prediction on top of the actual measurement result of the RS resource configuration.
[0091] In some implementations, the direct RLF prediction is not based on temporal domain serving cell measurement predictions (e.g., SINR) . The UE 104 may directly predict whether RLF will occur in a time window or time instance.
[0092] The UE 104 performs 320 the SCG RLF prediction based on the configuration.
[0093] In the context of the present disclosure, reference to “perform SCG RLF prediction” means that the UE 104 predicts whether RLF will occur in a primary secondary cell (PSCell) of an SCG. For example, the UE 104 may predict whether RLF will occur in the PSCell in a time window or at a time instance.
[0094] In turn, the UE 104 transmits 330 at least one result of the SCG RLF prediction to the network node 102.
[0095] In some implementations, the UE 104 may transmit the at least one result of the SCG RLF prediction to the network node 102 via an MCG link or an SCG link.
[0096] In some implementations, a result of the SCG RLF prediction may comprise a first index indicating a range of a probability that RLF will occur in the PSCell in a time window or time instance.
[0097] For example, the first index may include one of values of 0-20.0 indicates a probability of 0%, which means that RLF will not occur in the PSCell in a time window or time instance. 1 indicates a probability of 1%-5%, which means a probability that RLF will occur in the PSCell in the time window or time instance is 1%-5%. 2 indicates a probability of 6%-10%, which means a probability that RLF will occur in the PSCell in the time window or time instance is 6%-10%, …, 20 indicates a probability of 96%-100%, which means a probability that RLF will occur in the PSCell in the time window or time instance is 96%-100%.
[0098] In some implementations, both the UE 104 and the network node 102 may maintain a first mapping table between the first index and the range of the probability.
[0099] Alternatively, in some implementations, a result of the SCG RLF prediction may comprise a second index indicating a level of the probability.
[0100] For example, the second index may include one of the following: zero, low, medium and high. Zero means no RLF occurrence in the PSCell. High means it is high probability of RLF occurrence in the PSCell.
[0101] In some implementations, both the UE 104 and the network node 102 may maintain a first mapping table between the second index and the level of the probability.
[0102] In the process 300, the network node 102 does not need to explicitly indicate the UE 104 to which node to transmit the result of the SCG RLF prediction. In this way, signaling overhead may be reduced.
[0103] Fig. 4 illustrates a signaling diagram illustrating an example process 400 that supports RLF prediction in DC in accordance with aspects of the present disclosure. The process 400 may be considered as an example implementation of the process 300. The process 400 may involve the UE 104, the first network node 210 and the second network node 220 in Fig. 2.
[0104] Generally, in the process 400, the first network node 210 may be implemented as an MN, and the second network node 220 may be implemented as an SN. Thus, the first network node 210 is also referred to as an MN 210, and the second network node 220 is also referred to as an SN 220.
[0105] In addition, in the process 400, the UE 104 is in dual connection with the first network node 210 and the second network node 220. For example, the UE 104 is connected with the first network node 210 and the second network node 220 via MCG and SCG, respectively.
[0106] The UE 104 is configured with measurement configuration related to L1 measurement and L3 measurement. The UE 104 transmits an L1 measurement report or L3 measurement report to the MCG or SCG.
[0107] As shown in Fig. 4, the MN 210 transmits 410, to the UE 104, a request for capability information about the UE 104.
[0108] The UE 104 transmits 420, to the MN 210, the capability information about the UE 104 based on the request.
[0109] In some implementations, the capability information about the UE 104 may comprise capability of RLF prediction of the UE 104. For example, the capability of RLF prediction of the UE 104 may indicate the UE 104 supports at least one of the following: RLF prediction, RLF prediction based on direct prediction, RLF prediction based on indirect prediction, maximum time of RLF prediction and SCG RLF prediction.
[0110] The MN 210 transmits 430 a configuration for SCG RLF prediction to the UE 104.
[0111] In some implementations, the MN 210 may transmit the configuration for SCG RLF prediction to the UE 104 via signaling radio bearer 1 (SRB1) in an MCG link.
[0112] Alternatively, in some implementations, the configuration for SCG RLF prediction may be provided by the SN 220 in the inter node RRC message and transmitted in an MN RRC message. Then, the SN 220 transmits the configuration for SCG RLF prediction from the MN 210 to the UE 104 via a split SRB1.
[0113] In some implementations, the configuration for SCG RLF prediction may further comprise a threshold for SCG RLF prediction. For example, the threshold may comprise a threshold for an SINR of the PSCell of the UE 104. If SINR of the PSCell of the UE 104 is less than the threshold, the UE 104 may predict that RLF will occur in the PSCell in a time window or time instance.
[0114] In some implementations, the configuration for SCG RLF prediction may further comprise an indication indicating whether a direct RLF prediction or indirect RLF prediction is to be performed.
[0115] In some implementations, the configuration for SCG RLF prediction may comprise a first time window or a first time instance where a result of the SCG RLF prediction is to be applied.
[0116] In some implementations, multiple RLF predictions are not allowed to configure the UE 104 at the same time instance. In such implementations, after receiving the configuration for SCG RLF prediction, the UE 104 may receive a second configuration for SCG RLF prediction from the network node 102. The second configuration may comprise a second time window or a second time instance where the result of the SCG RLF prediction is to be applied. In such implementations, the UE 104 may overwrite the first time window or the first time instance with the second time window or overwrite the first time window or the first time instance with the second time instance. In other words, the UE 104 may only perform the SCG RLF prediction based on the second configuration for SCG RLF prediction.
[0117] In some implementations, multiple RLF predictions are allowed to configure the UE 104 at the same time instance. In such implementations, the configuration for SCG RLF prediction may comprise multiple time windows or multiple time instances where multiple results of the SCG RLF prediction are to be applied. The UE 104 may predict whether RLF will occur in a PSCell in each of the multiple time windows or at each of the multiple time instances.
[0118] In some implementations, the MN 210 may also transmit a configuration for MCG RLF prediction to the UE 104.
[0119] In the context of the present disclosure, reference to “perform MCG RLF prediction” means that the UE 104 predicts whether RLF will occur in a primary cell (PCell) of an MCG. For example, the UE 104 may predict whether RLF will occur in the PCell in a time window or at a time instance.
[0120] In some implementations, the MN 210 may transmit the configuration for MCG RLF prediction together with or separate from the configuration for SCG RLF prediction. When the UE 104 reports the RLF prediction, an indication will be added to indicate the RLF prediction is for MCG or SCG.
[0121] Upon receiving the configuration for SCG RLF prediction, the UE 104 performs 440 the SCG RLF prediction based on the configuration for SCG RLF prediction.
[0122] In some implementations, if the MN 210 transmits the configuration for MCG RLF prediction to the UE 104, the UE 104 may perform the MCG RLF prediction based on the configuration for MCG RLF prediction.
[0123] In turn, the UE 104 transmits 450 at least one result of the SCG RLF prediction to the MN 210.
[0124] In some implementations, if the UE 104 performs the MCG RLF prediction, the UE 104 may also transmit at least one result of the MCG RLF prediction to the MN 210.
[0125] In some implementations, the UE 104 may transmit the at least one result of the SCG RLF prediction together with a first indication. The first indication indicates that the at least one result of the RLF prediction is for an SCG.
[0126] In some implementations, the UE 104 may also transmit measurement results related to the SCG to the MN 210.
[0127] In some implementations, the UE 104 may also transmit measurement results related to a target SN (not shown) to the MN 210.
[0128] Upon receiving the at least one result of the SCG RLF prediction, the MN 210 may initiate 460 switching from a source SN (i.e., the SN 220) to a target SN (not shown) based on the at least one result of the SCG RLF prediction.
[0129] In some implementations, the MN 210 may initiate switching from the source SN to the target SN by transmitting at least one of the following to the target SN: the at least one result of the SCG RLF prediction, or measurement results related to the target SN.
[0130] For example, the MN 210 may initiate switching from the source SN to the target SN by transmitting an SN Addition Request message to the target SN. The SN Addition Request message may be used to request the target SN to allocate resources for the UE 104. The SN Addition Request message may comprise at least one of the following: the at least one result of the SCG RLF prediction, or predicted measurement results related to the target SN.
[0131] In some implementations, if data forwarding is needed, the target SN may provide data forwarding addresses to the MN 210.
[0132] In some implementations, if the target SN agrees to allocate resources for the UE 104, the MN 210 may initiate the release of the source SN 220. For example, the MN 210 may transmit, to the source SN 220, a request for releasing the source SN 220. The request may comprise the at least one result of the SCG RLF prediction.
[0133] In some implementations, the request may further comprise a cause value indicating it is predicted that RLF will occur in a PSCell. For example, the cause value may be “SCG RLF predicted” indicating it is predicted that RLF will occur in a PSCell.
[0134] Fig. 5 illustrates a signaling diagram illustrating an example process 500 that supports RLF prediction in DC in accordance with aspects of the present disclosure. The process 500 may be considered as an example implementation of the process 300. The process 500 may involve the UE 104, the first network node 210 and the second network node 220 in Fig. 2.
[0135] Actions 410, 420, 430, 440 and 450 in the process 500 are the same as those in the process 400. Details of these actions are omitted for brevity.
[0136] The process 500 is different from the process 400 in actions 510 and 520.
[0137] As shown in Fig. 5, upon receiving the at least one result of the SCG RLF prediction, the MN 210 transmits 510 the at least one result of the SCG RLF prediction to the SN 220. Accordingly, the SN 220 receives the at least one result of the SCG RLF prediction from the MN 210.
[0138] In some implementations, optionally, the MN 210 may transmit, to the serving SN 220, measurement results related to the SCG. Accordingly, the SN 220 may receive the measurement results related to the SCG from the MN 210.
[0139] In some implementations, the MN 210 may transmit a request message to the serving SN 220. The request message may comprise the at least one result of the SCG RLF prediction. Optionally, the request message may also comprise measurement results related to the SCG. For example, the MN 210 may transmit an SgNB Modification Request message to the serving SN 220. The SgNB Modification Request message may comprise the at least one result of the SCG RLF prediction. Optionally, the SgNB Modification Request message may also comprise measurement results related to the SCG.
[0140] Upon receiving the at least one result of the SCG RLF prediction, the SN 220 may determine 520 a candidate PSCell for the UE 104 based on the at least one result of the SCG RLF prediction. Before the RLF occurs, the UE 104 may perform handover to the candidate PSCell.
[0141] Fig. 6 illustrates a signaling diagram illustrating an example process 600 that supports RLF prediction in DC in accordance with aspects of the present disclosure. The process 600 may be considered as an example implementation of the process 300. The process 600 may involve the UE 104, the first network node 210 and the second network node 220 in Fig. 2.
[0142] Generally, in the process 600, the first network node 210 may be implemented as an MN, and the second network node 220 may be implemented as an SN. Thus, the first network node 210 is also referred to as an MN 210, and the second network node 220 is also referred to as an SN 220.
[0143] In addition, in the process 600, the UE 104 is in dual connection with the first network node 210 and the second network node 220. For example, the UE 104 is connected with the first network node 210 and the second network node 220 via MCG and SCG, respectively.
[0144] The UE 104 is configured with measurement configuration related to L1 measurement and L3 measurement. The UE 104 transmits an L1 measurement report or L3 measurement report to the MCG or SCG.
[0145] As shown in Fig. 6, the MN 210 transmits 610, to the UE 104, a request for capability information about the UE 104.
[0146] The UE 104 transmits 620, to the MN 210, the capability information about the UE 104 based on the request.
[0147] In some implementations, the capability information about the UE 104 may comprise capability of RLF prediction of the UE 104. For example, the capability of RLF prediction of the UE 104 may indicate the UE 104 supports at least one of the following: RLF prediction, RLF prediction based on direct prediction, RLF prediction based on indirect prediction, maximum time of RLF prediction and SCG RLF prediction.
[0148] The MN 210 transmits 630 the capability information about the UE 104 to the SN 220.
[0149] The SN 220 transmits 640 a configuration for SCG RLF prediction to the UE 104.
[0150] In some implementations, the SN 220 may transmit the configuration for SCG RLF prediction to the UE 104 via an MCG link. For example, if SRB 3 is not configured, the SN 220 may transmit the configuration for SCG RLF prediction to the UE 104 via SRB1 in an MCG link.
[0151] Alternatively, in some implementations, the SN 220 may transmit the configuration for SCG RLF prediction to the UE 104 via an SCG link. For example, if SRB 3 is configured, the SN 220 may transmit the configuration for SCG RLF prediction to the UE 104 via SRB3 in an SCG link.
[0152] In some implementations, the configuration for SCG RLF prediction may further comprise a threshold for SCG RLF prediction. For example, the threshold may comprise a threshold for an SINR of the PSCell of the UE 104. If SINR of the PSCell of the UE 104 is less than the threshold, the UE 104 may predict that RLF will occur in the PSCell in a time window or time instance.
[0153] In some implementations, the configuration for SCG RLF prediction may further comprise an indication indicating whether a direct RLF prediction or indirect RLF prediction is to be performed.
[0154] In some implementations, the configuration for SCG RLF prediction may comprise a first time window or a first time instance where a result of the SCG RLF prediction is to be applied.
[0155] In some implementations, multiple RLF predictions are not allowed to configure the UE 104 at the same time instance. In such implementations, after receiving the configuration for SCG RLF prediction, the UE 104 may receive a second configuration for SCG RLF prediction from the network node 102. The second configuration may comprise a second time window or a second time instance where the result of the SCG RLF prediction is to be applied. In such implementations, the UE 104 may overwrite the first time window or the first time instance with the second time window or overwrite the first time window or the first time instance with the second time instance. In other words, the UE 104 may only perform the SCG RLF prediction based on the second configuration for SCG RLF prediction.
[0156] In some implementations, multiple RLF predictions are allowed to configure the UE 104 at the same time instance. In such implementations, the configuration for SCG RLF prediction may comprise multiple time windows or multiple time instances where multiple results of the SCG RLF prediction are to be applied. The UE 104 may predict whether RLF will occur in a PSCell in each of the multiple time windows or at each of the multiple time instances.
[0157] Upon receiving the configuration for SCG RLF prediction, the UE 104 performs 650 the SCG RLF prediction based on the configuration for SCG RLF prediction.
[0158] In turn, the UE 104 transmits 660 at least one result of the SCG RLF prediction to the MN 210.
[0159] In some implementations, the UE 104 may transmit at least one result of the SCG RLF prediction to the SN 220 via an MCG link. For example, if SRB 3 is not configured, the UE 104 may transmit at least one result of the SCG RLF prediction to the SN 220 via an MCG link. For example, the UE 104 may transmit at least one result of the SCG RLF prediction to the SN 220 via SRB1 in an MCG link.
[0160] Alternatively, in some implementations, the UE 104 may transmit at least one result of the SCG RLF prediction to the SN 220 via an SCG link. For example, if SRB 3 is configured, the UE 104 may transmit at least one result of the SCG RLF prediction to the SN 220 via an SCG link. For example, the UE 104 may transmit at least one result of the SCG RLF prediction to the SN 220 via SRB3 in an SCG link.
[0161] Upon receiving the at least one result of the SCG RLF prediction, the SN 220 may determine 670 a candidate PSCell for the UE 104 based on the at least one result of the SCG RLF prediction.
[0162] In some implementations, the SN 220 may initiate the SN Modification without the MN involvement. In such implementations, the SN 220 may initiate modification without the MN involvement procedure which is used to change the PSCell in case no coordination with the MN 210 is required.
[0163] Alternatively, in some implementations, the SN 220 may initiate the SN Modification with the MN involvement. In such implementations, the SN 220 may transmit a required message to the MN 210. For example, if the SN 220 would like to trigger PSCell change and a new security key is required or when the MN 210 needs to perform PDCP data recovery, the SN 220 may transmit an SN modification required message to the MN 210. The SN modification required message may indicate RRC reconfiguration needs to be performed.
[0164] In some implementations, the required message may comprise a third indication indicating it is predicted that RLF will occur in a PSCell. In some implementations, the required message may comprise a cause value indicating it is predicted that RLF will occur in the PSCell. For example, the cause value may be “SCG RLF predicted” indicating it is predicted that RLF will occur in the PSCell. For example, the SN modification required message may comprise the cause value “SCG RLF predicted” indicating it is predicted that RLF will occur in the PSCell.
[0165] Upon receiving the SN modification required message, the MN 210 may transmit an RRC reconfiguration message to the UE 104 directly. Once receiving a successful reconfiguration message, the MN 210 may transmit a confirmation message to the SN 220.
[0166] Fig. 7 illustrates a signaling diagram illustrating an example process 700 that supports RLF prediction in DC in accordance with aspects of the present disclosure. The process 700 may be considered as an example implementation of the process 300. The process 700 may involve the UE 104, the first network node 210 and the second network node 220 in Fig. 2.
[0167] Actions 610, 620, 630, 640, 650 and 660 in the process 700 are the same as those in the process 600. Details of these actions are omitted for brevity.
[0168] The process 700 is different from the process 600 in actions 710 and 720.
[0169] As shown in Fig. 7, upon receiving the at least one result of the SCG RLF prediction, the SN 220 transmits 710 the at least one result of the SCG RLF prediction to the MN 210. Accordingly, the MN 210 receives the at least one result of the SCG RLF prediction from the SN 220.
[0170] Upon receiving the at least one result of the SCG RLF prediction, the MN 210 may initiate 720 switching from a source SN (i.e., the SN 220) to a target SN (not shown) based on the at least one result of the SCG RLF prediction.
[0171] In some implementations, the MN 210 may initiate switching from the source SN to the target SN by transmitting at least one of the following to the target SN: the at least one result of the SCG RLF prediction, or predicted measurement results related to the target SN.
[0172] For example, the MN 210 may initiate switching from the source SN to the target SN by transmitting an SN Addition Request message to the target SN. The SN Addition Request message may be used to request the target SN to allocate resources for the UE 104. The SN Addition Request message may comprise at least one of the following: the at least one result of the SCG RLF prediction, or predicted measurement results related to the target SN.
[0173] In some implementations, if data forwarding is needed, the target SN may provide data forwarding addresses to the MN 210.
[0174] In some implementations, if the target SN agrees to allocate resources for the UE 104, the MN 210 may initiate the release of the source SN 220. For example, the MN 210 may transmit, to the source SN 220, a request for releasing the source SN 220. The request may comprise the at least one result of the SCG RLF prediction.
[0175] Fig. 8 illustrates an example of a device 800 that supports RLF prediction in DC in accordance with aspects of the present disclosure. The device 800 may be an example of a network entity 102 as described herein. The device 800 may support wireless communication with one or more network entities 102, UEs 104, or any combination thereof. The device 800 may include components for bi-directional communications including components for transmitting and receiving communications, such as a processor 802, a memory 804, a transceiver 806, and, optionally, an I / O controller 808. These components may be in electronic communication or otherwise coupled (e.g., operatively, communicatively, functionally, electronically, electrically) via one or more interfaces (e.g., buses) .
[0176] The processor 802, the memory 804, the transceiver 806, or various combinations thereof or various components thereof may be examples of means for performing various aspects of the present disclosure as described herein. For example, the processor 802, the memory 804, the transceiver 806, or various combinations or components thereof may support a method for performing one or more of the operations described herein.
[0177] In some implementations, the processor 802, the memory 804, the transceiver 806, or various combinations or components thereof may be implemented in hardware (e.g., in communications management circuitry) . The hardware may include a processor, a digital signal processor (DSP) , an application-specific integrated circuit (ASIC) , a field-programmable gate array (FPGA) or other programmable logic device, a discrete gate or transistor logic, discrete hardware components, or any combination thereof configured as or otherwise supporting a means for performing the functions described in the present disclosure. In some implementations, the processor 802 and the memory 804 coupled with the processor 802 may be configured to perform one or more of the functions described herein (e.g., executing, by the processor 802, instructions stored in the memory 804) .
[0178] For example, the processor 802 may support wireless communication at the device 800 in accordance with examples as disclosed herein. The processor 802 may be configured to operable to support a means for performing the following: transmitting, to a UE, a configuration for SCG RLF prediction; and receiving at least one result of the SCG RLF prediction from the UE.
[0179] Alternatively, in some implementations, the processor 802 may be configured to operable to support a means for performing the following: receiving, from a network node, a configuration for SCG RLF prediction; performing the SCG RLF prediction based on the configuration; and transmitting at least one result of the SCG RLF prediction to the network node.
[0180] The processor 802 may include an intelligent hardware device (e.g., a general-purpose processor, a DSP, a CPU, a microcontroller, an ASIC, an FPGA, a programmable logic device, a discrete gate or transistor logic component, a discrete hardware component, or any combination thereof) . In some implementations, the processor 802 may be configured to operate a memory array using a memory controller. In some other implementations, a memory controller may be integrated into the processor 802. The processor 802 may be configured to execute computer-readable instructions stored in a memory (e.g., the memory 804) to cause the device 800 to perform various functions of the present disclosure.
[0181] The memory 804 may include random access memory (RAM) and read-only memory (ROM) . The memory 804 may store computer-readable, computer-executable code including instructions that, when executed by the processor 802 cause the device 800 to perform various functions described herein. The code may be stored in a non-transitory computer-readable medium such as system memory or another type of memory. In some implementations, the code may not be directly executable by the processor 802 but may cause a computer (e.g., when compiled and executed) to perform functions described herein. In some implementations, the memory 804 may include, among other things, a basic I / O system (BIOS) which may control basic hardware or software operation such as the interaction with peripheral components or devices.
[0182] The I / O controller 808 may manage input and output signals for the device 800. The I / O controller 808 may also manage peripherals not integrated into the device 800. In some implementations, the I / O controller 808 may represent a physical connection or port to an external peripheral. In some implementations, the I / O controller 808 may utilize an operating system such as or another known operating system. In some implementations, the I / O controller 808 may be implemented as part of a processor, such as the processor 806. In some implementations, a user may interact with the device 800 via the I / O controller 808 or via hardware components controlled by the I / O controller 808.
[0183] In some implementations, the device 800 may include a single antenna 810. However, in some other implementations, the device 800 may have more than one antenna 810 (i.e., multiple antennas) , including multiple antenna panels or antenna arrays, which may be capable of concurrently transmitting or receiving multiple wireless transmissions. The transceiver 806 may communicate bi-directionally, via the one or more antennas 810, wired, or wireless links as described herein. For example, the transceiver 806 may represent a wireless transceiver and may communicate bi-directionally with another wireless transceiver. The transceiver 806 may also include a modem to modulate the packets, to provide the modulated packets to one or more antennas 810 for transmission, and to demodulate packets received from the one or more antennas 810. The transceiver 806 may include one or more transmit chains, one or more receive chains, or a combination thereof.
[0184] A transmit chain may be configured to generate and transmit signals (e.g., control information, data, packets) . The transmit chain may include at least one modulator for modulating data onto a carrier signal, preparing the signal for transmission over a wireless medium. The at least one modulator may be configured to support one or more techniques such as amplitude modulation (AM) , frequency modulation (FM) , or digital modulation schemes like phase-shift keying (PSK) or quadrature amplitude modulation (QAM) . The transmit chain may also include at least one power amplifier configured to amplify the modulated signal to an appropriate power level suitable for transmission over the wireless medium. The transmit chain may also include one or more antennas 810 for transmitting the amplified signal into the air or wireless medium.
[0185] A receive chain may be configured to receive signals (e.g., control information, data, packets) over a wireless medium. For example, the receive chain may include one or more antennas 810 for receive the signal over the air or wireless medium. The receive chain may include at least one amplifier (e.g., a low-noise amplifier (LNA) ) configured to amplify the received signal. The receive chain may include at least one demodulator configured to demodulate the receive signal and obtain the transmitted data by reversing the modulation technique applied during transmission of the signal. The receive chain may include at least one decoder for decoding the processing the demodulated signal to receive the transmitted data.
[0186] Fig. 9 illustrates an example of a processor 900 that supports RLF prediction in DC in accordance with aspects of the present disclosure. The processor 900 may be an example of a processor configured to perform various operations in accordance with examples as described herein. The processor 900 may include a controller 902 configured to perform various operations in accordance with examples as described herein. The processor 900 may optionally include at least one memory 904, such as L1 / L2 / L3 cache. Additionally, or alternatively, the processor 900 may optionally include one or more arithmetic-logic units (ALUs) 906. One or more of these components may be in electronic communication or otherwise coupled (e.g., operatively, communicatively, functionally, electronically, electrically) via one or more interfaces (e.g., buses) .
[0187] The processor 900 may be a processor chipset and include a protocol stack (e.g., a software stack) executed by the processor chipset to perform various operations (e.g., receiving, obtaining, retrieving, transmitting, outputting, forwarding, storing, determining, identifying, accessing, writing, reading) in accordance with examples as described herein. The processor chipset may include one or more cores, one or more caches (e.g., memory local to or included in the processor chipset (e.g., the processor 900) or other memory (e.g., random access memory (RAM) , read-only memory (ROM) , dynamic RAM (DRAM) , synchronous dynamic RAM (SDRAM) , static RAM (SRAM) , ferroelectric RAM (FeRAM) , magnetic RAM (MRAM) , resistive RAM (RRAM) , flash memory, phase change memory (PCM) , and others) .
[0188] The controller 902 may be configured to manage and coordinate various operations (e.g., signaling, receiving, obtaining, retrieving, transmitting, outputting, forwarding, storing, determining, identifying, accessing, writing, reading) of the processor 900 to cause the processor 900 to support various operations in accordance with examples as described herein. For example, the controller 902 may operate as a control unit of the processor 900, generating control signals that manage the operation of various components of the processor 900. These control signals include enabling or disabling functional units, selecting data paths, initiating memory access, and coordinating timing of operations.
[0189] The controller 902 may be configured to fetch (e.g., obtain, retrieve, receive) instructions from the memory 904 and determine subsequent instruction (s) to be executed to cause the processor 900 to support various operations in accordance with examples as described herein. The controller 902 may be configured to track memory address of instructions associated with the memory 904. The controller 902 may be configured to decode instructions to determine the operation to be performed and the operands involved. For example, the controller 902 may be configured to interpret the instruction and determine control signals to be output to other components of the processor 900 to cause the processor 900 to support various operations in accordance with examples as described herein. Additionally, or alternatively, the controller 902 may be configured to manage flow of data within the processor 900. The controller 902 may be configured to control transfer of data between registers, arithmetic logic units (ALUs) , and other functional units of the processor 900.
[0190] The memory 904 may include one or more caches (e.g., memory local to or included in the processor 900 or other memory, such RAM, ROM, DRAM, SDRAM, SRAM, MRAM, flash memory, etc. In some implementation, the memory 904 may reside within or on a processor chipset (e.g., local to the processor 900) . In some other implementations, the memory 904 may reside external to the processor chipset (e.g., remote to the processor 900) .
[0191] The memory 904 may store computer-readable, computer-executable code including instructions that, when executed by the processor 900, cause the processor 900 to perform various functions described herein. The code may be stored in a non-transitory computer-readable medium such as system memory or another type of memory. The controller 902 and / or the processor 900 may be configured to execute computer-readable instructions stored in the memory 904 to cause the processor 900 to perform various functions. For example, the processor 900 and / or the controller 902 may be coupled with or to the memory 904, the processor 900, the controller 902, and the memory 904 may be configured to perform various functions described herein. In some examples, the processor 900 may include multiple processors and the memory 904 may include multiple memories. One or more of the multiple processors may be coupled with one or more of the multiple memories, which may, individually or collectively, be configured to perform various functions herein.
[0192] The one or more ALUs 906 may be configured to support various operations in accordance with examples as described herein. In some implementation, the one or more ALUs 906 may reside within or on a processor chipset (e.g., the processor 900) . In some other implementations, the one or more ALUs 906 may reside external to the processor chipset (e.g., the processor 900) . One or more ALUs 906 may perform one or more computations such as addition, subtraction, multiplication, and division on data. For example, one or more ALUs 906 may receive input operands and an operation code, which determines an operation to be executed. One or more ALUs 906 be configured with a variety of logical and arithmetic circuits, including adders, subtractors, shifters, and logic gates, to process and manipulate the data according to the operation. Additionally, or alternatively, the one or more ALUs 906 may support logical operations such as AND, OR, exclusive-OR (XOR) , not-OR (NOR) , and not-AND (NAND) , enabling the one or more ALUs 906 to handle conditional operations, comparisons, and bitwise operations.
[0193] The processor 900 may support wireless communication at the device 900 in accordance with examples as disclosed herein. The processor 900 may be configured to operable to support a means for performing the following: transmitting, to a UE, a configuration for SCG RLF prediction; and receiving at least one result of the SCG RLF prediction from the UE.
[0194] Alternatively, in some implementations, the processor 900 may be configured to operable to support a means for performing the following: receiving, from a network node, a configuration for SCG RLF prediction; performing the SCG RLF prediction based on the configuration; and transmitting at least one result of the SCG RLF prediction to the network node.
[0195] Fig. 10 illustrates a flowchart of a method 1000 that supports RLF prediction in DC in accordance with aspects of the present disclosure. The operations of the method 1000 may be implemented by a device or its components as described herein. For example, the operations of the method 1000 may be performed by the network node 102 as described herein. In some implementations, the device may execute a set of instructions to control the function elements of the device to perform the described functions. Additionally, or alternatively, the device may perform aspects of the described functions using special-purpose hardware.
[0196] At 1010, the method may include transmitting, to a UE, a configuration for SCG RLF prediction. The operations of 1010 may be performed in accordance with examples as described herein. In some implementations, aspects of the operations of 1010 may be performed by a device as described with reference to Fig. 1 or 2.
[0197] At 1020, the method may include receiving at least one result of the SCG RLF prediction from the UE. The operations of 1020 may be performed in accordance with examples as described herein. In some implementations, aspects of the operations of 1020 may be performed by a device as described with reference to Fig. 1 or 2.
[0198] Fig. 11 illustrates a flowchart of a method 1100 that supports RLF prediction in DC in accordance with aspects of the present disclosure. The operations of the method 1100 may be implemented by a device or its components as described herein. For example, the operations of the method 1100 may be performed by the UE 104 as described herein. In some implementations, the device may execute a set of instructions to control the function elements of the device to perform the described functions. Additionally, or alternatively, the device may perform aspects of the described functions using special-purpose hardware.
[0199] At 1110, the method may include receiving, from a network node, a configuration for SCG RLF prediction. The operations of 1110 may be performed in accordance with examples as described herein. In some implementations, aspects of the operations of 1110 may be performed by a device as described with reference to Fig. 1 or 2.
[0200] At 1120, the method may include performing the SCG RLF prediction based on the configuration. The operations of 1120 may be performed in accordance with examples as described herein. In some implementations, aspects of the operations of 1120 may be performed by a device as described with reference to Fig. 1 or 2.
[0201] At 1130, the method may include transmitting at least one result of the SCG RLF prediction to the network node. The operations of 1130 may be performed in accordance with examples as described herein. In some implementations, aspects of the operations of 1130 may be performed by a device as described with reference to Fig. 1 or 2.
[0202] It shall be noted that implementations of the present disclosure which have been described with reference to Figs. 1 to 7 are also applicable to the device 800, the processor 900 as well as the methods 1000 and 1100.
[0203] It should be noted that the methods described herein describes possible implementations, and that the operations and the steps may be rearranged or otherwise modified and that other implementations are possible. Further, aspects from two or more of the methods may be combined.
[0204] The various illustrative blocks and components described in connection with the disclosure herein may be implemented or performed with a general-purpose processor, a DSP, an ASIC, a CPU, an FPGA or other programmable logic device, discrete gate or transistor logic, discrete hardware components, or any combination thereof designed to perform the functions described herein. A general-purpose processor may be a microprocessor, but in the alternative, the processor may be any processor, controller, microcontroller, or state machine. A processor may also be implemented as a combination of computing devices (e.g., a combination of a DSP and a microprocessor, multiple microprocessors, one or more microprocessors in conjunction with a DSP core, or any other such configuration.
[0205] The functions described herein may be implemented in hardware, software executed by a processor, firmware, or any combination thereof. If implemented in software executed by a processor, the functions may be stored on or transmitted over as one or more instructions or code on a computer-readable medium. Other examples and implementations are within the scope of the disclosure and appended claims. For example, due to the nature of software, functions described herein may be implemented using software executed by a processor, hardware, firmware, hardwiring, or combinations of any of these. Features implementing functions may also be physically located at various positions, including being distributed such that portions of functions are implemented at different physical locations.
[0206] Computer-readable media includes both non-transitory computer storage media and communication media including any medium that facilitates transfer of a computer program from one place to another. A non-transitory storage medium may be any available medium that may be accessed by a general-purpose or special-purpose computer. By way of example, non-transitory computer-readable media may include RAM, ROM, electrically erasable programmable ROM (EEPROM) , flash memory, compact disk (CD) ROM or other optical disk storage, magnetic disk storage or other magnetic storage devices, or any other non-transitory medium that may be used to carry or store desired program code means in the form of instructions or data structures and that may be accessed by a general-purpose or special-purpose computer, or a general-purpose or special-purpose processor.
[0207] As used herein, including in the claims, an article “a” before an element is unrestricted and understood to refer to “at least one” of those elements or “one or more” of those elements. The terms “a, ” “at least one, ” “one or more, ” and “at least one of one or more” may be interchangeable. As used herein, including in the claims, “or” as used in a list of items (e.g., a list of items prefaced by a phrase such as “at least one of” or “one or more of” or “one or both of” ) indicates an inclusive list such that, for example, a list of at least one of A, B, or C means A or B or C or AB or AC or BC or ABC (i.e., A and B and C) . Also, as used herein, the phrase “based on” shall not be construed as a reference to a closed set of conditions. For example, an example step that is described as “based on condition A” may be based on both a condition A and a condition B without departing from the scope of the present disclosure. In other words, as used herein, the phrase “based on” shall be construed in the same manner as the phrase “based at least in part on. Further, as used herein, including in the claims, a “set” may include one or more elements.
[0208] The description herein is provided to enable a person having ordinary skill in the art to make or use the disclosure. Various modifications to the disclosure will be apparent to a person having ordinary skill in the art, and the generic principles defined herein may be applied to other variations without departing from the scope of the disclosure. Thus, the disclosure is not limited to the examples and designs described herein but is to be accorded the broadest scope consistent with the principles and novel features disclosed herein.
Claims
1.A network node, comprising:a processor; anda transceiver coupled to the processor,wherein the processor is configured to:transmit, via the transceiver to a UE, a configuration for SCG RLF prediction; andreceive at least one result of the SCG RLF prediction via the transceiver from the UE.2.The network node of claim 1, wherein the configuration for SCG RLF prediction comprises a first time window or a first time instance where a result of the SCG RLF prediction is to be applied.3.The network node of claim 1, wherein the configuration for SCG RLF prediction comprises multiple time windows or multiple time instances where multiple results of the SCG RLF prediction are to be applied.4.The network node of claim 1, wherein the processor is configured to receive the at least one result of the SCG RLF prediction together with a first indication, wherein the first indication indicates that the at least one result of the RLF prediction is for an SCG.5.The network node of claim 1, wherein the network node comprises a master node (MN) .6.The network node of claim 5, wherein the processor is further configured to:initiate switching from a source secondary node (SN) to a target SN based on the at least one result of the SCG RLF prediction.7.The network node of claim 6, wherein the processor is configured to initiate switching from the source SN to the target SN by:transmitting at least one of the following via the transceiver to the target SN:the at least one result of the SCG RLF prediction, orpredicted measurement results related to the target SN.8.The network node of claim 6, wherein the processor is configured to initiate switching from the source SN to the target SN by:transmitting, via the transceiver to the source SN, a request for releasing the source SN, wherein the request comprises the at least one result of the SCG RLF prediction.9.The network node of claim 5, wherein the processor is further configured to:transmit at least one of the following via the transceiver to a serving secondary node (SN) :the at least one result of the SCG RLF prediction, orpredicted measurement results related to a target SN.10.The network node of claim 9, wherein the processor is configured to transmit the at least one of the following via a request message:the at least one result of the SCG RLF prediction, orthe predicted measurement results related to the target SN.11.The network node of claim 1, wherein the network node comprises a secondary node (SN) .12.The network node of claim 11, wherein the processor is further configured to:receive capability information about the UE via the transceiver from a master node (MN) ; andwherein the processor is configured to transmit the configuration for SCG RLF prediction based on the capability information.13.The network node of claim 11, wherein the processor is configured to transmit the configuration for SCG RLF prediction by:transmitting, via the transceiver to the UE, the configuration for SCG RLF prediction via a master cell group (MCG) link or an SCG link.14.The network node of claim 13, wherein the processor is configured to receive the at least one result of the SCG RLF prediction by:receiving, via the transceiver from the UE, the at least one result of the SCG RLF prediction via a master cell group (MCG) link or an SCG link.15.The network node of claim 11, wherein the processor is further configured to:determine a candidate primary secondary cell (PSCell) for the UE based on the at least one result of the SCG RLF prediction.16.The network node of claim 11, wherein the processor is further configured to:transmit a required message via the transceiver to a master node (MN) , wherein the required message comprises a second indication indicating it is predicted that RLF will occur in a primary secondary cell (PSCell) .17.The network node of claim 11, wherein the processor is further configured to:transmit the at least one result of the SCG RLF prediction via the transceiver to a master node (MN) .18.A user equipment (UE) , comprising:a processor; anda transceiver coupled to the processor,wherein the processor is configured to:receive, via the transceiver from a network node, a configuration for SCG RLF prediction;perform the SCG RLF prediction based on the configuration; andtransmit at least one result of the SCG RLF prediction via the transceiver to the network node.19.A processor for wireless communication, comprising:at least one memory; anda controller coupled with the at least one memory and configured to cause the controller to:receive, via the transceiver from a network node, a configuration for SCG RLF prediction;perform the SCG RLF prediction based on the configuration; andtransmit at least one result of the SCG RLF prediction via the transceiver to the network node.20.A method performed by a user equipment (UE) , comprising:receiving, from a network node, a configuration for SCG RLF prediction;performing the SCG RLF prediction based on the configuration; andtransmitting at least one result of the SCG RLF prediction via the transceiver to the network node.
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