Inter-frequency low power wake-up signal (LP-WUS) monitoring conditions

Abstract

An apparatus comprising at least one processor; and at least one memory having instructions stored thereon. The instructions, when executed by the at least one processor, cause the apparatus to perform at least the following: configure to monitor for a low power wake-up signal (LP-WUS) and paging on a first carrier and respond to a paging received on the first carrier on at least one second carrier; determine at least one threshold, wherein the at least one threshold is derived based on at least one condition related to a channel quality of at least one of the first carrier or the at least one second carrier for monitoring the LP-WUS on the first carrier; and in response to receiving the LP-WUS or the paging on the first carrier, evaluate whether at least one channel measurement of the at least one second carrier satisfies the determined at least one threshold.

Description

Technical Field

[0001] Various example embodiments relate to low-power wake-up signals (LP-WUS) and paging, and more specifically, to configurations for receiving LP-WUS and paging on a first carrier and for responding to paging on a second carrier. Background Technology

[0002] Wireless networking offers significant advantages to user mobility. The ability to stay connected while on the move not only benefits users but also contributes to greater efficiency and productivity across society. As expectations for connection reliability, data speed, and low power consumption become increasingly demanding, technologies for wireless networking must keep pace with these expectations. Accordingly, there is ongoing interest in improving wireless networking technologies. Summary of the Invention

[0003] In various aspects, an apparatus includes: at least one processor; and at least one memory storing instructions that, when executed by the at least one processor, cause the apparatus to at least: be configured to monitor a low-power wake-up signal (LP-WUS) and a paging on a first carrier, and to respond to a paging received on at least one second carrier; determine at least one threshold based on at least one condition related to the channel quality of at least one of the first carrier or at least one second carrier for monitoring LP-WUS on the first carrier; and, in response to receiving LP-WUS or a paging on the first carrier, evaluate whether at least one channel measurement on at least one second carrier satisfies the determined at least one threshold.

[0004] In one aspect, the indication of at least one second carrier includes at least one of the following: an indication of at least one cell in which the UE should attempt to respond to a paging, an indication of at least one frequency band in which the UE should attempt to respond to a paging, or an indication of at least one frequency in which the UE should attempt to respond to a paging.

[0005] In one respect, when the paging message includes the UE's identifier, the paging is addressing the UE.

[0006] In one respect, the identifier is S-TMSI (Temporary Mobile Subscription Identifier).

[0007] In one respect, the identifier is I-RNTI (Inactive Radio Network Temporary Identifier).

[0008] In one respect, the first carrier and at least one second carrier have different frequencies.

[0009] In one respect, the first carrier and at least one second carrier are in different frequency bands.

[0010] In one aspect, the first carrier is provided by the serving cell serving the UE, and at least one second carrier is provided by at least one second cell.

[0011] In one aspect, the cell providing the first carrier and at least one cell providing at least one second carrier are provided by different base stations.

[0012] In one aspect, the cell providing the first carrier and at least one cell providing at least one second carrier are in different frequency bands.

[0013] In one aspect, at least one condition for monitoring LP-WUS on a first carrier, which is related to the channel quality of at least one of the first carrier or at least one second carrier, includes at least one of the following: an entry condition, which, if the entry condition is met, causes LP-WUS to be monitored on the first carrier; or an exit condition, which, if the exit condition is met, causes LP-WUS not to be monitored on the first carrier and causes paging timing to be monitored on the first carrier, wherein at least one threshold is determined based on at least one of the entry condition or the exit condition.

[0014] In one aspect, the entry condition includes an entry threshold, the exit condition includes an exit threshold, and at least one threshold is determined based on the entry threshold and the exit threshold.

[0015] In one aspect, at least one condition for monitoring LP-WUS on a first carrier, relating to the channel quality of at least one of the first carrier or at least one second carrier, includes an implementation-specific threshold, and at least one threshold is determined based on the implementation-specific threshold.

[0016] In one aspect, at least one condition for monitoring LP-WUS on a first carrier, relating to the channel quality of at least one of the first carrier or at least one second carrier, includes a configured threshold, and at least one threshold is determined based on the configured threshold.

[0017] In one aspect, at least one channel measurement of at least one second carrier includes measurements stored prior to receiving LP-WUS or paging on the first carrier, and an evaluation based on the stored measurements is performed.

[0018] In one aspect, at least one channel measurement of at least one second carrier includes measurements obtained after receiving LP-WUS or paging on the first carrier, and an evaluation is performed based on the obtained measurements.

[0019] In one aspect, when executed by at least one processor, the instruction also causes the device to at least perform: obtaining measurements using the UE’s primary radio based on at least one system synchronization block on at least one second carrier.

[0020] In one aspect, when executed by at least one processor, the instruction also causes the device to at least perform: initiating a random access procedure on at least one second carrier based on at least one channel measurement on at least one second carrier satisfying at least one determined threshold.

[0021] In one aspect, when executed by at least one processor, the instruction also causes the device to at least perform: initiating a random access procedure on the first carrier based on at least one channel measurement on at least one second carrier not satisfying at least one determined threshold.

[0022] In various aspects, a method in a user equipment (UE) includes: configuring to monitor a low-power wake-up signal (LP-WUS) and paging on a first carrier, and responding to a paging received on at least one second carrier; determining at least one threshold, the at least one threshold being derived based on at least one condition related to the channel quality of at least one of the first carrier or at least one second carrier for monitoring LP-WUS on the first carrier; and evaluating whether at least one channel measurement of at least one second carrier satisfies the determined at least one threshold in response to receiving LP-WUS or paging on the first carrier.

[0023] In various aspects, a non-transitory processor-readable medium stores instructions that, when executed by at least one processor of the device, cause the device to at least: be configured to monitor a low-power wake-up signal (LP-WUS) and a paging on a first carrier, and to respond to a paging received on at least one second carrier; determine at least one threshold, the at least one threshold being derived based on at least one condition related to the channel quality of at least one of the first carrier or at least one second carrier for monitoring LP-WUS on the first carrier; and, in response to receiving LP-WUS or a paging on the first carrier, evaluate whether at least one channel measurement of at least one second carrier satisfies the determined at least one threshold.

[0024] The independent claims and examples are provided in accordance with certain aspects. Further aspects are defined in the dependent claims and examples. Attached Figure Description

[0025] Some exemplary embodiments will now be described with reference to the accompanying drawings.

[0026] Figure 1 This is a diagram illustrating an example embodiment of wireless networking between a network system and a user equipment (UE) according to an aspect of this disclosure;

[0027] Figure 2 This is a diagram illustrating an example component of a network system according to this disclosure;

[0028] Figure 3 This is a diagram illustrating an example embodiment of a contention-based random access procedure according to this disclosure;

[0029] Figure 4 This is a diagram of an example embodiment of a UE's primary wireless and low-power wake-up receiver according to an aspect of this disclosure;

[0030] Figure 5 This is a diagram illustrating an example of operations for receiving LP-WUS and paging on a first carrier and for attempting to respond to paging on a second carrier, according to the present disclosure;

[0031] Figure 6 It is a block diagram including a further example of an operation according to the present disclosure for receiving LP-WUS and paging on a first carrier, and for attempting to respond to paging on a second carrier;

[0032] Figure 7 This is a diagram illustrating an example of an operation for receiving LP-WUS and paging on a first carrier, and for attempting to respond to paging on a second carrier if conditions are met, according to this disclosure;

[0033] Figure 8 This is a diagram illustrating an example of operations for receiving LP-WUS and paging on a first carrier, and for attempting to respond to paging on a second carrier if conditions are not met, according to an aspect of this disclosure;

[0034] Figure 9 This is a diagram illustrating an example of operations for receiving LP-WUS and paging on a first carrier, and for attempting to respond to paging on a second carrier after evaluating the second carrier following the reception of LP-WUS or paging; and

[0035] Figure 10 This is a diagram illustrating an example of a component of a user equipment or network device according to this disclosure. Detailed Implementation

[0036] This disclosure relates to a configuration for receiving a low-power wake-up signal (LP-WUS) and paging on a first carrier, and for responding to paging on a second carrier.

[0037] Wireless systems (e.g., 5G systems) are designed and developed for both mobile phones and vertical use cases. In addition to latency, reliability, and availability, user equipment (UE) energy efficiency is also critical for such systems. Currently, depending on individual usage time, UEs may need to be charged weekly or daily. Generally, UEs consume tens of milliwatts in RRC idle / inactive states and hundreds of milliwatts in Radio Resource Control (RRC) connected states. Designs that extend battery life are important for improving energy efficiency and a better user experience.

[0038] Energy efficiency is even more critical for UEs without a continuous power source (e.g., UEs using small rechargeable batteries and single-coin cells). In vertical use cases, sensors and actuators can be widely deployed for monitoring, measurement, and / or charging. Generally, as described in 3GPP Technical Report (TR) 38.875, their batteries are not rechargeable and are expected to last for at least several years. Wearable UEs include smartwatches, rings, electronic health-related devices, and medical monitoring devices, among others. Sustaining such UEs for 1-2 weeks with typical battery capacities is challenging.

[0039] Power consumption depends in part on the configured length of the wake-up period, such as the paging cycle. To meet the battery life requirements mentioned above, long eDRX (Extended Discontinuous Receive) cycles can be used, resulting in high latency, which is unsuitable for services requiring both long battery life and low latency. For example, in fire detection and suppression use cases, fire shutters should close and fire sprinklers should be activated by actuators within 1 to 2 seconds from when a fire is detected by a sensor; long eDRX cycles cannot meet this requirement. Therefore, eDRX is clearly unsuitable for latency-critical use cases.

[0040] In RRC IDLE / INACTIVE mode, significant UE power savings (up to 90% or more) are achieved by using LP-WUS (received by the Low Power Wake-up Receiver (LP-WUR) to trigger UE primary radio (MR) paging monitoring) compared to Idle mode DRX (I-DRX) operation (with and without Early Paging Indication (PEI)), provided sufficient relaxation is applied to MR radio resource management (RRM) measurements. As used herein, the term "relaxation" in relation to measurements means and refers to measurements being performed at a lower frequency than normally occurs. Furthermore, significant paging latency reduction and modest UE power savings are achieved compared to existing eDRX operation if the performance of LP-WUS monitoring and the corresponding paging monitoring after MR wake-up is not limited to the existing paging time window (PTW) of eDRX.

[0041] In RRC Connected mode, compared to UE power-saving techniques, moderate UE power saving gains (up to 10% or more) can be achieved by using LP-WUS / WUR to trigger UE MR physical downlink control channel (PDCCH) monitoring across different types of Extended Reality (XR) services and system load scenarios, with negligible impact on capacity. When the UE MR enters deep sleep during LP-WUS monitoring, significant UE power saving gains (up to 60% or more) and moderate user-aware throughput (UPT) improvements (up to 10% or more) are achieved for File Transfer Protocol (FTP) and Instant Messaging (IM) services. Furthermore, the 3GPP Rel-18 study indicates the feasibility of offloading serving cell RRM measurements from UE MR to LP-WUR through a reasonable evaluation methodology. Therefore, it is recommended that LP-WUS / WUR be specified in 3GPP Rel-19.

[0042] In various respects, this disclosure enables the UE to use a low-power wake-up receiver (LP-WUR) instead of a main radio (MR) in certain situations, thereby allowing the UE to reduce power consumption.

[0043] In the following description, certain specific details are set forth in order to provide a thorough understanding of the disclosed aspects. However, those skilled in the art will recognize that these aspects can be practiced without one or more of these specific details or using other methods, components, materials, etc. In other instances, well-known structures associated with transmitters, receivers, or transceivers are not shown or described in detail to avoid unnecessarily obscuring the description of the aspects.

[0044] Throughout this specification, references to “an aspect” or “one aspect” mean that a particular feature, structure, or characteristic described in connection with that aspect is included in at least one aspect. Therefore, the appearance of the phrase “in an aspect” or “in one aspect” throughout this specification does not necessarily refer to the same aspect. Furthermore, a particular feature, structure, or characteristic may be combined in any suitable manner with one or more aspects.

[0045] The embodiments described in this disclosure can be implemented in wireless networking devices, such as, but not limited to, devices utilizing Global Microwave Access Interoperability (WiMAX), Global System for Mobile Communications (GSM, 2G), GSM EDGE Radio Access Network (GERAN), General Packet Radio Service (GRPS), Universal Mobile Telecommunications System based on Basic Wideband Code Division Multiple Access (W-CDMA) (UMTS, 3G), High-Speed ​​Packet Access (HSPA), Long Term Evolution (LTE), Advanced LTE, Enhanced LTE (eLTE), 5G New Radio (5G NR), Advanced 5G, 6G (and higher), and 802.11ax (Wi-Fi 6). Here, the term "eLTE" refers to LTE evolution connected to a 5G core. LTE is also referred to as Evolved UMTS Terrestrial Radio Access (EUTRA) or Evolved UMTS Terrestrial Radio Access Network (EUTRAN).

[0046] This disclosure may use the term "serving network device" to refer to a network node or network device (or part thereof) serving a UE. As used herein, the terms "transmitting toward," "sending to," "receiving from," and "cooperating with" (and variations thereof) include communication, which may or may not involve communication via one or more intermediate devices or nodes. The term "acquiring" (and variations thereof) includes acquiring in the first case or re-acquiring after the first case. The term "connection" may mean a physical connection or a logical connection.

[0047] This disclosure uses 5G NR as an example of a wireless network, and may use smartphones and / or extended reality headsets as examples of UEs. This means, and should be understood, that these examples are merely illustrative, and this disclosure applies to other wireless networks and user equipment.

[0048] Figure 1 This is a diagram illustrating an example of wireless networking between network system 100 and user equipment (UE) 150. Network system 100 may include one or more network nodes 120, one or more servers 110, and / or one or more network devices 130 (e.g., test equipment). Network node 120 will be described in more detail below. As used herein, the term "network apparatus" may refer to any component of network system 100, such as server 110, network node 120, network device 130, any(multiple) components of the foregoing, and / or any(multiple) other components of network system 100. Examples of network apparatus include, but are not limited to, apparatuses for implementing various aspects of 5G NR, etc. This disclosure describes embodiments related to 5G NR and embodiments relating to aspects defined by the 3rd Generation Partnership Project (3GPP). However, embodiments related to other wireless networking technologies are contemplated and are covered within the scope of this disclosure.

[0049] The following description provides further details of examples of network nodes. In a 5G NR network, for example, according to Section 3.2 of 3GPP TS 38.300 V16.6.0 (2021-06) (which is incorporated herein by reference), a gNodeB (also known as a gNB) may include, for example, a node that provides New Radio (NR) user plane and control plane protocol termination toward the UE and is connected to the 5G core (5GC) via an NG interface.

[0050] gNB supports various protocol layers, such as Layer 1 (L1) – the physical layer, Layer 2 (L2) and Layer 3 (L3).

[0051] NR's Layer 2 (L2) is divided into the following sublayers: Media Access Control (MAC), Radio Link Control (RLC), Packet Data Convergence Protocol (PDCP), and Service Data Adaptation Protocol (SDAP), among which, for example: ○ The physical layer provides a transmission channel to the MAC sublayer; ○The MAC sublayer provides logical channels to the RLC sublayer; ○ The RLC sublayer provides RLC channels to the PDCP sublayer; ○ The PDCP sublayer provides radio bearers to the SDAP sublayer; ○The SDAP sublayer provides Quality of Service (QoS) flows to 5GC; ○ The control channels include the Broadcast Control Channel (BCCH) and the Physical Control Channel (PCCH).

[0052] For example, according to Section 6 of 3GPP TS 38.300 V16.6.0 (2021-06) (which is incorporated herein by reference), Layer 3 (L3) includes, for example, Radio Resource Control (RRC).

[0053] The gNB Central Unit (gNB-CU) includes, for example, logical nodes that host, for example, the gNB's Radio Resource Control (RRC), Serving Data Adaptation Protocol (SDAP), and Packet Data Convergence Protocol (PDCP), or the en-gNB's RRC and PDCP protocols. The logical nodes control the operation of one or more gNB Distributed Units (gNB-DUs). The gNB-CU terminates the connection to the gNB-DU via an F1 interface. The gNB-CU may also be referred to herein as a CU, Central Unit, Centralized Unit, or Control Unit.

[0054] A gNB-DU (gNB Distributed Unit) includes, for example, a logical node that hosts the Radio Link Control (RLC), Media Access Control (MAC), and Physical (PHY) layers of, for example, a gNB or en-gNB, and its operation is partially controlled by the gNB-CU. A gNB-DU supports one or more cells. A cell is supported by only one gNB-DU. The gNB-DU terminates at the F1 interface connected to the gNB-CU. The gNB-DU may also be referred to herein as a DU or Distributed Unit.

[0055] The gNB-CU-Control Plane (gNB-CU-CP) includes, for example, logical nodes that host the control plane portion of the gNB-CU for the RRC and PDCP protocols of the en-gNB or gNB. The gNB-CU-CP terminates the E1 interface connected to the gNB-CU-User Plane (gNB-CU-UP) and the F1-C interface connected to the gNB-DU.

[0056] The gNB-CU-User Plane (gNB-CU-UP) includes, for example, logical nodes that host, for example, the user plane portion of the gNB-CU for the en-gNB's PDCP protocol, and the user plane portions of the gNB-CU for the gNB's PDCP and SDAP protocols. For example, according to Section 3.1 of 3GPP TS 38.401 V16.6.0 (2021-07) (incorporated herein by reference), the gNB-CU-UP terminates the E1 interface connected to the gNB-CU-CP and the F1-U interface connected to the gNB-DU.

[0057] As used herein, the term "network node" may refer to any one of gNB, gNB-CU, gNB-DU, gNB-CU-CP, or gNB-CU-UP, or any combination thereof.

[0058] RAN (Radio Access Network) nodes or network nodes (such as, for example, gNB, gNB-CU, or gNB-DU, or a portion thereof) can be implemented using means, for example, having at least one processor and / or at least one memory, the at least one memory having processor-readable instructions (“programs”), the processor-readable instructions (“programs”) being configured to support and / or supply and / or process functionalities and / or features associated with the CU and / or DU, and / or at least one protocol (sub)layer of the RAN (Radio Access Network), such as layer 2 and / or layer 3. Different functional divisions between central units and distributed units are possible. The following will combine... Figure 8 Examples to describe such devices and components.

[0059] The gNB-CU and gNB-DU portions can be, for example, co-located or physically separated. The gNB-DU can even be divided into, for example, two parts, one including processing equipment and the other including antennas. The Central Unit (CU) can also be referred to as a Baseband Unit (BBU) / Radio Equipment Controller (REC) / Cloud RAN (C-RAN) / Virtual RAN (V-RAN), Open RAN (O-RAN), or a portion thereof. The Distributed Unit (DU) can also be referred to as a Remote Radio Headend (RRH) / Remote Radio Unit (RRU) / Radio Equipment (RE) / Radio Unit (RU), or a portion thereof. In the various example embodiments of this disclosure, a network node supporting at least one of the Layer 3 protocols of the Central Unit functionality or the Radio Access Network can be, for example, a gNB-CU. Similarly, a network node supporting at least one of the Layer 2 protocols of the Distributed Unit functionality or the Radio Access Network can be, for example, a gNB-DU.

[0060] A gNB-CU can support one or more gNB-DUs. A gNB-DU can support one or more cells, and therefore can support the serving cell of a user equipment (UE), or a candidate cell for procedures such as handover, dual connectivity, and / or carrier aggregation.

[0061] User equipment (UE) 150 may be or include wireless or mobile devices, devices having a wireless interface for interacting with the RAN (Radio Access Network), smartphones, in-vehicle devices, IoT devices, or M2M devices, and other types of user equipment. This UE 150 may include: at least one processor; and at least one memory including program code; wherein the at least one memory and the computer program code are configured, together with the at least one processor, to cause the device to perform at least certain operations, such as, for example, an RRC connection to the RAN. Figure 6 Examples of components describing the UE are provided below. In an embodiment, UE 150 may be configured to generate messages (e.g., including a cell ID) to be transmitted wirelessly toward the RAN (e.g., to reach and communicate with the serving cell). In an embodiment, UE 150 may generate, transmit, and receive RRC messages containing one or more RRCPDUs (Packet Data Units). Those skilled in the art will understand the RRC protocol and other processes that the UE may perform.

[0062] Continue to refer to Figure 1In an example of a 5G NR network, network system 100 provides one or more cells that define the coverage area of ​​network system 100. As described above, network system 100 may include a gNB of the 5G NR network, or may include any other means configured to control wireless communications and manage radio resources within the cells. As used herein, the term "resource" may refer to radio resources such as resource blocks (RBs), physical resource blocks (PRBs), radio frames, subframes, time slots, subbands, frequency regions, subcarriers, beams, etc. In embodiments, network node 120 may be referred to as a base station.

[0063] Figure 1 Examples are provided, and only network system 100 and UE 150 are shown. Those skilled in the art will understand that network system 100 includes... Figure 1 Components not shown in the diagram, and it will be understood that other user equipment can communicate with network system 100.

[0064] Figure 2 yes Figure 1 A block diagram of example components of network system 100. A 5G NR network can be described as an example of network system 100, and this means that the aspects described below should also apply to other types of network systems. The network system can be configured according to... Figure 1 The signals and connections shown operate to enable UE 150 to communicate with network system 100 via radio access network 225. Additionally, as shown and described herein, the network system can be divided into user plane components and functions, and control plane components and functions. Unless otherwise indicated, the terms "component," "function," and "service" are used interchangeably herein, and they can refer to instructions executed by one or more processors, and are implemented by instructions executed by one or more processors.

[0065] The following describes example functionality of the components. This example functionality is merely illustrative, and it should be understood that additional operations and functions can be performed by the components described herein. Furthermore, connections between components can be based on virtual connections over service interfaces, allowing any component to communicate with any other component. In this way, any component can act as a service "producer" for any other component acting as a service "consumer," providing services for network functionality.

[0066] For example, a core network 210 is described in the control plane of the network system. The core network 210 may include an Authentication Server Function (AUSF) 211, an Access and Mobility Management Function (AMF) 212, and a Session Management Function (SMF) 213. The core network 210 may also include a Network Slice Selection Function (NSSF) 214, a Network Open Function (NEF) 215, a Network Repository Function (NRF) 216, and a Unified Data Management Function (UDM) 217, whereby UDM 217 may include a Unified Data Repository (UDR) 224.

[0067] Additional components and functions of the core network 210 may include application functions 218, policy control functions (PCF) 219, network data analysis functions (NWDAF) 220, analytical data repository functions (ADRF) 221, management data analysis functions (MDAF) 222, and operation and management functions (OAM) 223.

[0068] The user plane includes UE 150, Radio Access Network (RAN) 225, User Plane Function (UPF) 226, and Data Network (DN) 227. RAN 225 may include a combination of Figure 1 The RAN 225 may be limited to one or more components, such as one or more network nodes. However, the RAN 225 may not be limited to such components. The UPF 226 provides connectivity for data transmitted on the RAN 225. For example, the DN 226 identifies services from service providers, internet access, and third-party services.

[0069] AMF 212 handles connectivity and mobility tasks. AUSF 211 receives authentication requests from AMF 212 and interacts with UDM 217 to authenticate and verify the network response used to determine successful authentication. SMF 213 performs Packet Data Unit (PDU) session management and manages the session context with UPF 226.

[0070] NSSF 214 can select a Network Slice Instance (NSI) and determine the allowed Network Slice Selection Assistance Information (NSSAI). This selection and determination are used to configure AMF 212 to provide services to UE 150. NEF 215 protects third-party access to network services to create specialized network services. NRF 216 acts as a repository for storing network functions to allow functions to register and discover each other.

[0071] UDM 217 generates authentication vectors for use by AUSF 211 and ADM 212, and provides user identification processing. UDM 217 can connect to UDR 224, which stores data associated with authentication, applications, etc. AF 218 provides application services (e.g., streaming services) to users. PCF 219 provides policy control functions. For example, PCF 219 can assist with network slicing and mobility management, as well as provide Quality of Service (QoS) and accounting functions.

[0072] NWDAF 220 (e.g., from UE 150 and network systems) collects data to perform network analytics and provides insights into the capabilities that leverage analytics in service delivery. ADRF 221 allows consumers to store, retrieve, and remove data and analytics. MDAF 222 provides additional data analytics services for network functions. OAM 223 provides provisioning and management processing capabilities to manage elements in or connected to the network (e.g., UE 150, network nodes, etc.).

[0073] Figure 2 These are merely examples of components of a network system, and various variations are envisioned within the scope of this disclosure. In embodiments, the network system may include... Figure 2 Other components not shown. In embodiments, the network system may not include... Figure 2 Each component is shown. In embodiments, components and connections may utilize different... Figure 2 The connections shown are used to achieve this. These and other embodiments are envisioned to be within the scope of this disclosure.

[0074] The process used for a UE to establish communication with a target cell is called a random access procedure. Random access procedures can be used for initial access, small data transmission during inactivity, transition from RRC_Inactive to RRC_Connected, beam failure recovery, connection reconstruction, handover, and cell addition, as well as other procedures that those skilled in the art will recognize.

[0075] The two types of random access procedures include contention-based random access (CBRA) and contention-free random access (CFRA). Figure 3 This is a diagram illustrating an example of a contention-based random access (CBRA) procedure. In the example shown, the signals include a random access preamble (MSG1) sent by UE 350 to network node 310 (e.g., gNodeB or a portion thereof), a random access response (MSG2) sent by network node 310 to UE 350, a scheduling transmission (MSG3) sent by UE 350 to network node 310, and a contention resolution (MSG4) sent by network node 310 to UE 350.

[0076] For MSG1, UE 350 selects the available random access preamble based on information elements in the Signal Synchronization Block (SSB). UE 350 sends the random access preamble (MSG1) to network node 310 using a specific time and frequency resource called the Random Access Opportunity (RO). UE 350 also provides the network with an identifier called the Random Access Radio Network Temporary Identifier (RA-RNTI), which allows the network to address it in the next step.

[0077] For MSG2, network node 310 detects the preamble, calculates various quantities, and sends a Physical Uplink Shared Channel (PUSCH) Uplink (UL) grant to UE 350. This is called a Random Access Response (RAR), which is sent as MSG2 addressed to UE 350 with the relevant RA-RNTI, and instructs UE 350 on the frequency and time at which it can send MSG3 on the PUSCH.

[0078] For MSG3, in response to receiving MSG2 from network node 310, UE 350 uses the UL authorization provided in the RAR to send MSG3. Because the RAR provides time resource allocation, UE 350 sends MSG3 to network node 310 at the time specified by the time resource allocation, and it is a scheduled transmission. This MSG3 can be referred to as a Radio Resource Control (RRC) Connection Request message.

[0079] For MSG4, network node 310 can send MSG4 to UE 350 for contention resolution. Contention resolution can operate in the manner specified by 3GPP for 5G NR. After the random access procedure, assuming the contention resolution is successfully resolved, UE 350 becomes connected to network node 310. After connection establishment, various procedures will be handled by gNB-CU according to CU-DU partitioning. Other aspects of contention-based random access (CBRA) will be understood by those skilled in the art.

[0080] Another type of random access procedure is Contention-Free Random Access (CFRA) (not shown). In CFRA (not shown), network node 310 sends an assigned random access preamble to UE 350. UE 350 receives the assigned random access preamble and sends a random access preamble as MSG1 to network node 310 in its random access request. MSG2 and MSG3 are then similar to those described in conjunction with CBRA. Based on the use of the assigned random access preamble, conflict resolution is not required in CFRA. Other aspects of Contention-Free Random Access (CFRA) will be understood by those skilled in the art.

[0081] As described above, according to various aspects of this disclosure, this disclosure relates to configurations for receiving a low-power wake-up signal (LP-WUS) and paging on a first carrier, and for responding to paging on a second carrier.

[0082] Now for reference Figure 4 A block diagram of a UE including a primary wireless transceiver (MR) 410 and a low-power wake-up receiver (LP-WUR) 420 is shown. In various aspects of this disclosure, to conserve power, the UE's MR 410 can be in sleep mode or deep sleep mode or be turned off, and can only be activated after the LP-WUR 420 receives a wake-up signal from the network. When needed, the network can trigger the UE to wake up the MR transceiver 410 in an event-driven manner by sending a wake-up signal to the UE, which monitors the LP-WUR 420 using the LP-WUR 420. When the UE receives the LP-WUR 420, the LP-WUR 420 can trigger the wake-up of the MR transceiver, and communication using the MR can begin. Therefore, as... Figure 4 As shown, the LP-WUR 420 wakes up the main wireless 410, but in other cases, the main wireless 410 can be turned off or remain in deep sleep mode.

[0083] In various aspects, the possible transition time for moving the MR 410 from deep sleep to on can be in the range of 400ms-800ms or even longer. Therefore, in some embodiments, the MR ramp-up time from deep sleep can be quite long. Other durations are envisioned in the embodiments.

[0084] In all respects, the low-power wake-up receiver can operate in a always-on manner with very low power consumption. In the embodiment, the LP-WUR 420 can consume significantly less power than the MR 410 by using a simple wake-up signal and by using specialized hardware capable of receiving WUS for its monitoring.

[0085] Different types of LP-WUR 420 may include envelope detectors and sequence detectors. Envelope detectors are capable of detecting on / off keying, do not have an IQ branch to perform coherent / sequence detection, and can receive LP-WUS and low-power synchronization signals (LP-SS). Sequence detectors use an IQ branch to perform coherent detection, consume more power due to the better accuracy of the crystal oscillator (XO) used to drive the phase-locked loop (PLL), and can receive system synchronization blocks (SSBs) in addition to LP-WUS. In embodiments, different types of LP-WUR 420 may include orthogonal frequency division multiplexing (OFDM) based LP-WURs capable of detecting and measuring PSS / SSS signals. These and other embodiments are contemplated to be within the scope of this disclosure.

[0086] In this embodiment, MR 410 and LP-WUR 420 can be the same physical receiver, but can be logically different. In this embodiment, LP-WUR 420 can be implemented as a separate receiver. In this embodiment, LP-WUR 420 can be implemented as a low-power mode of MR 410. For example, when LP-WUR 420 is capable of detecting and measuring SSS and / or PSS / SSS, LP-WUR 420 and MR 410 can measure the same reference signal. Implementing LP-WUR 420 as a low-power mode of MR 410 reduces implementation complexity and allows the UE to easily share information between the MR and LP-WUR because they are implemented within the same receiver / module. For example, this can reduce the UE's wake-up / synchronization time and increase LP-WUR accuracy (e.g., because better components can be used).

[0087] The combination of the main radio 410 and the LP-WUR 420 may be advantageous in other respects. For example, in one embodiment, serving cell assessment can be offloaded from the MR 410 to the LP-WUR 420 to enable high power savings. As mentioned above, depending on the type of LP-WUR, the LP-WUR 420 can carry measurements related to serving cell assessment based on either a low-power synchronization signal (LP-SS) or an SSB. In one embodiment, because the coverage of both the LP-SS and LP-SUR 420 is limited, only serving cell assessment is offloaded to the LP-WUR 420.

[0088] Figure 4 The above description is merely an example, and variations thereof are contemplated within the scope of this disclosure.

[0089] Figure 5 An example is shown of operations for receiving LP-WUS and paging on a first carrier, and for attempting to respond to paging on a second carrier.

[0090] This diagram assumes that the UE has the following characteristics: Figure 4 The primary radio and LP-WUR are shown, and the system is configured to monitor LP-WUS and paging on a first carrier, and to attempt to respond to paging on a second carrier. In an embodiment, the first carrier and the second carrier have different frequencies. In an embodiment, the first carrier and the second carrier may be in different frequency bands. In an embodiment, the first carrier may be provided by a serving cell serving the UE, and the second carrier may be provided by a second cell different from the serving cell. In an embodiment, the cell providing the first carrier and the cell providing the second carrier are provided by different base stations. In an embodiment, the cell providing the first carrier and the cell providing the second carrier are in different frequency bands.

[0091] During the first time period 510, the MR is in deep sleep, and the LP-WUR monitors and detects the LP-WUS. After the LP-WUR detects the LP-WUS, it triggers the MR to wake up, for example, as... Figure 4 As shown. During time period 522, the MR starts and performs synchronization for the first carrier. Then, during time period 524, the MR monitors for paging addressed to the UE on the first carrier and detects the paging. In this embodiment, the network initiates the paging process by sending a paging message at the paging time (PO) of the UE. The network can address multiple UEs by including a paging record for each of the multiple UEs within the paging message.

[0092] After the MR detects a paging message addressed to the UE on the first carrier, as configured, the UE attempts to respond to the paging received on the first carrier on the second carrier. During time period 532, the UE performs cell (re)selection and synchronization on the second carrier using the primary radio. During time period 534, the UE receives System Information Block 1 (SIB1) on the second carrier using the primary radio. During time period 536, the UE performs a random access procedure on the second carrier using the primary radio, for example, by sending a random access preamble. There is a possibility that the random access procedure may fail, for example, due to potentially poor channel conditions for the second carrier, or due to congestion, etc. This is discussed in conjunction with the following... Figure 6 This problem is solved in the description.

[0093] Figure 5 The above description is merely an example, and variations thereof are contemplated within the scope of this disclosure.

[0094] about Figure 5 The potential problem with this operation is that the coverage of the first carrier and the second carrier may be different, and there may be a delay after paging because the UE needs to select the second carrier to respond to paging.

[0095] A UE's lack of knowledge about the conditions of the second carrier (e.g., if the UE does not measure the second carrier) can lead to additional problems. For example, the radio conditions of the (last used) cell in the second carrier may no longer be good enough to provide access due to, for example, coverage differences between two frequency layers, which could prevent the UE from transmitting on the second carrier due to, for example, the radio conditions of the second carrier. Therefore, paging response transmission may be impossible, or paging response transmission may fail, or RRC connection establishment or RRC recovery may fail. Other problems also exist.

[0096] The following is combined with Figures 6 to 9 To describe various solutions. Figures 6 to 8Conditions related to LP-WUS monitoring and paging are involved. Conditions relating to the first and / or second carriers, such as channel quality of the first and / or second carriers, are described in more detail below. Figure 9 This relates to operations for receiving LP-WUS and paging on a first carrier, and for attempting to respond to paging on a second carrier after evaluating the second carrier following the receipt of LP-WUS or paging.

[0097] Figure 6 Examples of further operations for receiving LP-WUS and paging on a first carrier and for attempting to respond to paging on a second carrier are shown. Figure 6 Also assume that the UE has the following characteristics: Figure 4 The main radio and LP-WUR are shown, and are configured to monitor LP-WUS and paging on the first carrier, and are configured to attempt to respond to paging on the second carrier.

[0098] In various aspects of this disclosure, the UE can be configured with a carrier list, which can be represented as carrier #2, ..., carrier #N. The UE can be configured to respond to a paging received on a first carrier on one of the carriers #2, ..., carrier #N. The carrier list can be provided by the network. In embodiments, the UE can receive (and the network can transmit) the carrier list in a dedicated signal (such as in an RRC release message received by the UE when the UE is in RRC connection mode). In embodiments, the UE can receive (and the network can transmit) the carrier list in a broadcast signal (such as in a System Information Block (SIB)).

[0099] In various aspects, the UE can perform measurements on carriers in the carrier list and can evaluate conditions associated with the carriers or cells on the carriers, such as comparing the measurements to thresholds. For example, the UE can evaluate whether the Reference Signal Received Power (RSRP) and / or Reference Signal Received Quality (RSRQ) of the cells on the carriers meet thresholds. In embodiments, the measurements can be performed by the UE's primary radio. In embodiments, the measurements can be performed by the UE's LP-WUR. These and other embodiments are contemplated within the scope of this disclosure.

[0100] In all aspects, measurements and condition assessments can be performed during time period 610. During time period 610, MR is in deep sleep, and LP-WUR monitors LP-WUS.

[0101] According to various aspects of this disclosure, during time period 610, when the MR is in deep sleep mode, the MR can be woken up from time to time to measure carrier #2, ..., carrier #N, and then return to deep sleep. The measurements during time period 610 are relaxed measurements because they occur at frequencies lower than the normally occurring measurement frequencies. As an example, the relaxed measurements may be taken once every 5 measurements, once every 8 measurements, or at another measurement frequency lower than the normally occurring frequency, compared to the normal measurement frequency.

[0102] In all aspects, during time period 610, the UE evaluates conditions related to carrier #2, ..., carrier #N, for example, by comparing measurements with thresholds. If a condition is met for any of the carriers #2, ..., carrier #N, it means that the channel quality of that carrier may be sufficient to respond to paging on that carrier. If a condition is not met for any of the carriers #2, ..., carrier #N, it means that the channel quality of that carrier may be insufficient to respond to paging on that carrier.

[0103] In this embodiment, during time period 620, after the LP-WUR detects the LP-WUS, the LP-WUR may trigger or not trigger an MR wake-up depending on the condition assessment. For example, if the assessment condition is not met for any of the carriers #2, ..., #N, the LP-WUR may not trigger an MR wake-up. However, if the assessment condition is met for any of the carriers #2, ..., #N, the LP-WUR may trigger an MR wake-up, allowing the UE to respond to paging on that carrier.

[0104] Assuming that the evaluation conditions are met for at least one of carriers #2, ..., #N, then during time period 620, the MR initiates and performs synchronization for the first carrier. Then, the MR monitors for paging requests addressed to the UE on the first carrier and detects the paging.

[0105] Continue to refer to Figure 6 After the MR detects a paging addressed to the UE on the first carrier, as configured, the UE attempts to respond to the paging received on the first carrier on one of the carriers in the list of carriers that have met the evaluation conditions. As a result of the MR measurement in time period 610, the UE can select one of the carriers that has passed the condition evaluation for use in responding to the paging.

[0106] If the carrier has passed the condition evaluation, during time period 630, the UE uses the primary radio to perform cell selection and synchronization on the selected carrier, receives System Information Block 1 (SIB1) on the selected carrier, and performs a random access procedure on the selected carrier, such as sending a random access preamble.

[0107] If no carrier passes the condition assessment, during time period 640, the UE performs cell selection and synchronization on the first carrier using the primary radio, receives System Information Block 1 (SIB1) on the first carrier, and performs a random access procedure on the first carrier, for example, sending a random access preamble.

[0108] Various embodiments will now be described.

[0109] In an embodiment, the conditions may relate to a first carrier and / or carrier #2, ..., carrier #N. In an embodiment, the conditions may include an entry condition, which, if met, causes LP-WUS to be monitored on the first carrier. In an embodiment, the conditions may include an exit condition, which, if met, causes LP-WUS to not be monitored on the first carrier and causes paging timing to be monitored on the first carrier.

[0110] In an embodiment, the measurement may be based on the reference signal received power (RSRP) and / or the reference signal received quality (RSRQ).

[0111] In an embodiment, the entry conditions may include conditions where RSRP and / or RSRQ are higher than a minimum threshold.

[0112] In an embodiment, the exit condition may include RSRP and / or a condition where RSRP is below a minimum threshold.

[0113] In this embodiment, if the exit condition is met and the UE receives a paging on the first carrier, the UE can respond to the paging on the first carrier.

[0114] In this embodiment, if the conditions are met, the UE can begin monitoring LP-WUS on the first carrier.

[0115] In this embodiment, if the conditions associated with carrier #2, ..., carrier #N are not met, the UE may not monitor LP-WUS on the first carrier, but may instead monitor paging on the first carrier.

[0116] In the embodiments, the same evaluation criteria can be used to evaluate all carriers among carrier #2, ..., carrier #N.

[0117] In the embodiments, different evaluation conditions can be used to evaluate some or each of carriers #2, ..., carrier #N.

[0118] In an embodiment, the UE may receive (and the network may send) evaluation conditions in a dedicated signal (such as an RRC release message received by the UE when the UE is in RRC connection mode).

[0119] In an embodiment, the UE may receive (and the network may transmit) evaluation conditions in a broadcast signal (such as in a System Information Block (SIB)).

[0120] In an embodiment, the measurement may be based on the primary synchronization signal (PSS), the secondary synchronization signal (SSS), and / or the low-power synchronization signal (LP-SS).

[0121] Figure 6 The above description is merely an example, and variations thereof are contemplated within the scope of this disclosure.

[0122] Figure 7 This is a flowchart illustrating an example of operations for receiving LP-WUS and paging on a first carrier, and for attempting to respond to paging on a second carrier if certain conditions are met. This operation is... Figure 7 The component shown at the top performs this action; in the example shown, this component includes a user equipment (UE), a RAN node (e.g., gNB) operating in band 1, and a RAN node (e.g., gNB) operating in band 2. This component can, for example, combine... Figure 1 and Figure 2 The same components described, or other components mentioned above. These components are merely examples and there may be two different RAN nodes (e.g., gNB and gNB2) instead of just a single RAN node (e.g., gNB).

[0123] Figure 7 Assume the UE has the following characteristics: Figure 4 The main wireless and LP-WUR are shown.

[0124] In Operation 701, the UE is in RRC idle mode or RRC inactive mode and is served by a RAN node (e.g., gNB) using band 1.

[0125] In operation 702, the UE is configured to monitor LP-WUS and paging on a first carrier and respond to paging received on the first carrier on a second carrier (e.g., in band 2 of the RAN node).

[0126] Operations 703-717 involve scenarios that meet the evaluation criteria.

[0127] In operation 703, the RAN node sends LP-WUS monitoring conditions to the UE, and the UE receives the LP-WUS monitoring conditions from the RAN node. In an embodiment, the conditions may include conditions related to a first carrier (e.g., for the serving cell) and conditions related to one or more other carriers (e.g., one or more carriers from neighboring cells, which may be a second carrier).

[0128] In operation 704, the UE measures a first carrier (e.g., for the serving cell) and one or more other carriers (e.g., one or more carriers from neighboring cells) that may be a second carrier.

[0129] In operation 705, the UE evaluates the LP-WUS monitoring conditions (received in operation 703) based on the measurements obtained in operation 704.

[0130] In operation 706, the UE determines that at least one of one or more other carriers meets the LP-WUS monitoring condition, allowing the UE to attempt to respond to a paging on that carrier.

[0131] During operation 707, the UE begins monitoring LP-WUS.

[0132] In operation 708, the RAN node sends LP-WUS to the UE, and the UE receives LP-WUS from the RAN node. In an embodiment, as combined with... Figure 4 As described, LP-WUS is received by LP-WUR.

[0133] In operation 709, LP-WUS triggers the UE's MR wake-up and monitors paging on the first carrier.

[0134] In operation 710, the RAN node sends a paging message to the UE for UE addressing, and the UE receives the paging message from the RAN node. In an embodiment, the paging addresses the UE by including a UE identifier that addresses the UE. In an embodiment, the UE identifier may be a Temporary Mobile Subscription Identifier (S-TMSI). In an embodiment, the UE identifier may be an Inactive Radio Network Temporary Identifier (I-RNTI).

[0135] In operation 711, the UE determines to respond to the paging received on the first carrier on the second carrier, wherein the UE determines in operation 706 that the second carrier meets the evaluation conditions.

[0136] In operation 712, the UE evaluates cell selection or cell reselection conditions for the second carrier. In the illustrated embodiment, the UE evaluates conditions for the second carrier (in band 2) of the RAN node. The UE determines that cell selection or reselection conditions for the second carrier (e.g., gNB, band 2) are met.

[0137] In operation 713, the UE initiates an attempt to respond to a paging received on the first carrier on a second carrier (e.g., gNB, band 2). In the illustrated embodiment, the UE initiates an RRC establishment request or an RRC recovery procedure.

[0138] In operation 714, the UE sends an RRC establishment or recovery request message to the RAN node on the second carrier (e.g., gNB, band 2), and the RAN node receives the message from the UE.

[0139] In operation 715, the RAN node sends an RRC establishment or recovery message to the UE, and the UE receives the RRC establishment or recovery message from the RAN node.

[0140] In operation 716, the UE sends an RRC establishment or recovery completion message to the RAN node (e.g., gNB, band 2), and the RAN node receives the message from the UE.

[0141] In operation 717, the UE sends a paging response (e.g., a non-access stratum (NAS) message) to the RAN node (e.g., gNB2, band 2), and the RAN node receives the paging response from the UE.

[0142] Combination Figure 6 The various embodiments described are applicable to Figure 7 And it is incorporated into this chapter by reference, just as it applies to... Figure 7 The operation is the same.

[0143] Now we will describe it from various perspectives. Figure 7 The operation.

[0144] From the UE's perspective, the operation includes: receiving from a Radio Access Network (RAN) node: at least one first condition associated with the first carrier for monitoring a Low Power Wake-up Signal (LP-WUS) on the first carrier, and at least one second condition associated with at least one second carrier for monitoring LP-WUS on the first carrier (e.g., operation 703), wherein the UE is configured to monitor paging timing on the first carrier and is configured to attempt to respond to a paging received on the first carrier on one of at least one second carrier; and determining whether to monitor LP-WUS or paging based on at least one first condition and at least one second condition (e.g., operations 711 and 712). Figure 8 Operation 809).

[0145] From the perspective of the RAN node, the operation includes: sending at least one first condition associated with the first carrier for the user equipment (UE) to monitor a low-power wake-up signal (LP-WUS) on the first carrier (e.g., operation 703); and sending at least one second condition associated with at least one second carrier for the UE to monitor LP-WUS on the first carrier, wherein the UE is configured to monitor paging opportunities on the first carrier and is configured to respond to paging opportunities received on the first carrier on at least one of the second carriers (e.g., operation 703).

[0146] Figure 7 The above description is merely an example, and variations thereof are contemplated within the scope of this disclosure.

[0147] Figure 8 This is a flowchart illustrating an example of operations for receiving LP-WUS and paging on a first carrier, and for attempting to respond to paging on a second carrier if conditions are not met. The operations are... Figure 8 The component shown at the top performs this function. In the example shown, this component includes a user equipment (UE), a RAN node (e.g., gNB) operating in band 1, and a RAN node (e.g., gNB) operating in band 2. This component can, for example, combine... Figure 1 and Figure 2 The same components described, or other components mentioned above. These components are merely examples and there may be two different RAN nodes (e.g., gNB and gNB2) instead of just a single RAN node (e.g., gNB).

[0148] Figure 8 Also assume that the UE has the following characteristics: Figure 4 The main wireless and LP-WUR are shown.

[0149] In Operation 801, the UE is in RRC idle mode or RRC inactive mode and is served by a RAN node (e.g., gNB) using band 1.

[0150] After operation 802, the UE is configured to monitor LP-WUS and paging on the first carrier and respond to paging received on the first carrier on the second carrier (e.g., in band 2 of the RAN node).

[0151] Operations 803-814 involve scenarios where the evaluation conditions are not met.

[0152] In operation 803, the RAN node sends LP-WUS monitoring conditions to the UE, and the UE receives the LP-WUS monitoring conditions from the RAN node. In an embodiment, the conditions may include conditions related to a first carrier (e.g., for the serving cell) and conditions related to one or more other carriers (e.g., one or more carriers of neighboring cells, which may be a second carrier).

[0153] In operation 804, the UE measures a first carrier (e.g., for the serving cell) and one or more other carriers (e.g., one or more carriers from neighboring cells) that may be a second carrier.

[0154] In operation 805, the UE evaluates the LP-WUS monitoring conditions (received in operation 803) based on the measurements obtained in operation 804.

[0155] In operation 806, the UE determines that the LP-WUS monitoring conditions have not been met with respect to one or more other carriers, so that the UE should not attempt to respond to paging on one or more other carriers.

[0156] In operation 807, MR wake-up occurs, and the UE begins monitoring paging on the first carrier.

[0157] In operation 808, the RAN node sends a paging message to the UE for UE addressing, and the UE receives the paging message from the RAN node. In an embodiment, the paging addresses the UE by including a UE identifier that addresses the UE. In an embodiment, the UE identifier may be a Temporary Mobile Subscription Identifier (S-TMSI). In an embodiment, the UE identifier may be an Inactive Radio Network Temporary Identifier (I-RNTI).

[0158] In operation 809, the UE determines to respond to a paging received on the first carrier.

[0159] In operation 810, the UE initiates an attempt to respond to a paging received on the first carrier. In the illustrated embodiment, the UE initiates an RRC establishment request or an RRC recovery procedure.

[0160] In operation 811, the UE sends an RRC establishment or recovery request message to the RAN node on the first carrier, and the RAN node receives the message from the UE.

[0161] In operation 812, the RAN node sends an RRC establishment or recovery message to the UE, and the UE receives the RRC establishment or recovery message from the RAN node.

[0162] In operation 813, the UE sends an RRC establishment or recovery completion message to the RAN node, and the RAN node receives the message from the UE.

[0163] In operation 814, the UE sends a paging response (e.g., a Non-Access Stratum (NAS) message) to the RAN node, and the RAN node receives the paging response from the UE.

[0164] Combination Figure 6 The various embodiments described are applicable to Figure 8 And it is incorporated into this chapter by reference, just as it applies to... Figure 8 The operation is the same.

[0165] Figure 8 The operations described are merely examples, and variations thereof are contemplated within the scope of this disclosure. In embodiments, the operations may include... Figure 8 Other operations not shown. In embodiments, operations may be performed by different means. Figure 8 The boxes shown and / or Figure 8Other boxes not shown are used to perform this. These and other embodiments are contemplated within the scope of this disclosure.

[0166] Figure 9 This diagram illustrates an example of operations including receiving LP-WUS and paging on a first carrier, and attempting to respond to paging on a second carrier after evaluating the second carrier following the reception of LP-WUS or paging. This operation is... Figure 9 The component shown at the top performs this action; in the example shown, this component includes a user equipment (UE), a RAN node (e.g., gNB) operating in band 1, and a RAN node (e.g., gNB) operating in band 2. This component can, for example, combine... Figure 1 and Figure 2 The same components described, or other components mentioned above. These components are merely examples and there may be two different RAN nodes (e.g., gNB and gNB2) instead of just a single RAN node (e.g., gNB).

[0167] Figure 9 Assume the UE has the following characteristics: Figure 4 The main wireless and LP-WUR are shown.

[0168] In Operation 901, the UE is in RRC idle mode or RRC inactive mode and is served by a RAN node (e.g., gNB) using band 1.

[0169] In operation 902, the UE is configured to monitor LP-WUS and paging on a first carrier and respond to paging received on the first carrier on a second carrier (e.g., in band 2 of the RAN node).

[0170] In operation 903, the RAN node sends the LP-WUS monitoring configuration to the UE, and the UE receives the LP-WUS monitoring configuration from the RAN node. In an embodiment, the configuration may include conditions related to a first carrier (e.g., for the serving cell) and conditions related to one or more other carriers (e.g., one or more carriers from neighboring cells, which may be a second carrier). In an embodiment, as described above... Figure 6 The conditions described include entry and exit conditions, which include thresholds.

[0171] In Operation 904, the UE measures a first carrier (e.g., for the serving cell) and one or more other carriers (e.g., one or more carriers from neighboring cells, which may be the second carrier).

[0172] In Operation 905, the UE evaluates the LP-WUS monitoring conditions (received in Operation 903) based on the measurements obtained in Operation 904.

[0173] In operation 906, the UE determines that at least one of one or more other carriers meets the LP-WUS monitoring condition, allowing the UE to attempt to respond to a paging on that carrier.

[0174] During operation 907, the UE begins monitoring LP-WUS.

[0175] In operation 908, the UE uses the primary radio to begin relaxed measurements. (As mentioned above...) Figure 6 As described, relaxed measurements occur less frequently than normal measurements.

[0176] In operation 909, the RAN node (e.g., gNB, band 2) sends a reference signal (e.g., synchronization signal block (SSB)) to the UE, and the UE receives the reference signal from the RAN node.

[0177] In Operation 910, the UE utilizes relaxation to monitor one or more other carriers (e.g., gNB, band 2) and performs relaxed measurements on one or more other carriers.

[0178] In operation 911, the UE stores the measurements obtained in operation 910.

[0179] In operation 912, the RAN node sends LP-WUS to the UE, and the UE receives LP-WUS from the RAN node. In an embodiment, as combined with Figure 4 As described, LP-WUS is received by LP-WUR.

[0180] Operations 913-915 below (referred to as Option 1.1) pertain to an embodiment where the UE evaluates one or more other carriers after receiving LP-WUS. Operations 917-919 below (referred to as Option 1.2) pertain to an embodiment where the UE evaluates one or more other carriers after receiving paging.

[0181] In option 1.1, the operation may include one or both of operation 913 and operation 915.

[0182] In Operation 913, either during or after receiving LP-WUS, the UE evaluates one or more other carriers (e.g., including gNB, band 2) based on measurements stored in Operation 911.

[0183] In operation 914, the RAN node (e.g., gNB, band 2) sends a reference signal (e.g., synchronization signal block (SSB)) to the UE, and the UE receives the reference signal from the RAN node. The UE measures the received reference signal.

[0184] In operation 915, the UE evaluates one or more other carriers (e.g., including gNB, band 2) based at least on measurements obtained in operation 914. In an embodiment, the UE may also evaluate one or more other carriers based on measurements stored in operation 911.

[0185] In operation 916, the RAN node sends a paging message to the UE for UE addressing, and the UE receives the paging message from the RAN node. In an embodiment, the paging addresses the UE by including a UE identifier that addresses the UE. In an embodiment, the UE identifier may be a Temporary Mobile Subscription Identifier (S-TMSI). In an embodiment, the UE identifier may be an Inactive Radio Network Temporary Identifier (I-RNTI).

[0186] If option 1.2 is not achieved after operation 916, the operation proceeds to operation 920.

[0187] In operation 920, the UE determines to respond to a paging received on the first carrier on the second carrier, wherein the UE determines that the second carrier can be used based on the evaluation in operation 913 and / or operation 915.

[0188] In operation 921, the UE evaluates cell selection or cell reselection conditions for the second carrier. In the illustrated embodiment, the UE evaluates conditions for the second carrier (in band 2) of the RAN node. The UE determines that the cell selection or reselection conditions for the second carrier (e.g., gNB2, band 2) are met.

[0189] In operation 922, the UE initiates an attempt to respond to a paging received on the first carrier on a second carrier (e.g., gNB2, band 2). In the illustrated embodiment, the UE initiates an RRC establishment request or an RRC recovery procedure.

[0190] In Operation 923, the UE sends an RRC establishment or recovery request message to the RAN node on the second carrier (e.g., gNB2, band 2), and the RAN node receives the message from the UE.

[0191] In operation 924, the RAN node sends an RRC establishment or recovery message to the UE, and the UE receives the RRC establishment or recovery message from the RAN node.

[0192] In operation 925, the UE sends an RRC establishment or recovery completion message to the RAN node (e.g., gNB2, band 2), and the RAN node receives the message from the UE.

[0193] In operation 926, the UE sends a paging response (e.g., a non-access stratum (NAS) message) to the RAN node (e.g., gNB2, band 2), and the RAN node receives the paging response from the UE.

[0194] After operation 916, if option 1.2 is achieved, the operation proceeds to operation 917.

[0195] In option 1.2, the operation may include one or both of operation 917 and operation 919.

[0196] In Operation 917, either when or after receiving a paging request, the UE evaluates one or more other carriers (e.g., including gNB, band 2) based on measurements stored in Operation 911.

[0197] In Operation 918, the RAN node (e.g., gNB, band 2) sends a reference signal (e.g., synchronization signal block (SSB)) to the UE, and the UE receives the reference signal from the RAN node. The UE measures the received reference signal.

[0198] In operation 919, the UE evaluates one or more other carriers (e.g., including gNB, band 2) based at least on measurements obtained in operation 918. In an embodiment, the UE may also evaluate one or more other carriers based on measurements stored in operation 911.

[0199] In operation 920, the UE determines to respond to a paging received on the first carrier on the second carrier, wherein the UE determines that the second carrier can be used based on the evaluation in operation 917 and / or operation 919.

[0200] In operation 921, the UE evaluates cell selection or cell reselection conditions for the second carrier. In the illustrated embodiment, the UE evaluates conditions for the second carrier (in band 2) of the RAN node. The UE determines that the cell selection or reselection conditions for the second carrier (e.g., gNB2, band 2) are met.

[0201] Operations 921-926 are the same as those described above.

[0202] Various embodiments will now be described.

[0203] In embodiments, the evaluations at operations 913, 915, 917, and 919 are not based on any explicitly defined threshold. Instead, the UE may derive a threshold for evaluation at operations 913, 915, 917, and 919. In embodiments, the UE may derive such a threshold based on an entry threshold and / or exit threshold (if included) received in operation 903. In embodiments, the UE may derive such a threshold based on an implementation-specific threshold. In embodiments, the UE may derive such a threshold based on LP-WUS monitoring conditions received in operation 903, which may include configured thresholds. Other possibilities are contemplated within the scope of this disclosure.

[0204] In an embodiment, the evaluations at operations 913, 915, 917, and 919 may be based on the reference signal received power (RSRP) and / or the reference signal received quality (RSRQ).

[0205] In an embodiment, if the evaluation indicates that the channel quality at operations 913, 915, 917, and 919 is unsatisfactory, the UE may attempt to respond to paging on the first carrier.

[0206] Now we will describe it from various perspectives. Figure 9 The operation.

[0207] From the UE's perspective, the operation includes: configuring to monitor a low-power wake-up signal (LP-WUS) and paging on a first carrier, and responding to a paging received on the first carrier on at least one second carrier (e.g., operation 902); determining at least one threshold, the at least one threshold being derived based on at least one condition related to the channel quality of at least one of the first carrier or at least one second carrier for monitoring LP-WUS on the first carrier (e.g., operations 913, 915, 916, and / or operation 918); and evaluating whether at least one channel measurement on at least one second carrier satisfies the determined at least one threshold in response to receiving LP-WUS or paging on the first carrier (e.g., operations 913, 915, 916, and / or operation 918).

[0208] Figure 9 The above description is merely an example, and variations thereof are contemplated within the scope of this disclosure.

[0209] Now for reference Figure 10 This diagram illustrates a block diagram of example components of a UE or network device. The device includes an electronic storage device (e.g., a non-transitory processor-readable medium) 1010, a processor 1020, a memory 1050, and a network interface 1040. The various components can be communicatively coupled to each other. The processor 1020 can be and may include any type of processor, such as a single-core central processing unit (CPU), a multi-core CPU, a microprocessor, a digital signal processor (DSP), a system-on-a-chip (SoC), or any other type of processor. The memory 1050 can be a volatile type of memory (e.g., RAM) or a non-volatile type of memory (e.g., NAND flash memory). The memory 1050 includes processor-readable instructions executable by the processor 1020 to cause the device to perform various operations (including operations mentioned herein, such as...). Figures 3 to 9 (Operation).

[0210] Electronic storage device 1010 can be and includes any type of electronic storage device for storing data, such as hard disk drives, solid-state drives, and / or optical disks, as well as other types of electronic storage devices. Electronic storage device 1010 stores processor-readable instructions for causing the device to perform its operations, and stores data associated with such operations, such as data related to the 5G NR standard, and other data. Network interface 1040 can implement wireless networking technologies, such as 5G NR and / or other wireless networking technologies.

[0211] Figure 10 The components shown are merely examples, and those skilled in the art will understand that the apparatus includes other components not shown, and may include multiple of any of the components shown. These and other embodiments are contemplated within the scope of this disclosure.

[0212] Other embodiments of this disclosure include the following examples. In the following text, any "component" may be implemented by at least one processor and processor-executable instructions, unless the context otherwise indicates. Any "component" for receiving or transmitting may be implemented by a transceiver. The symbol example nx refers to any example having a value for n and a value for x.

[0213] Example 1.1: A method in a user equipment (UE) comprising: Configured to monitor low-power wake-up signals (LP-WUS) and paging on a first carrier, and to respond to paging received on the first carrier on at least one second carrier; Determine at least one threshold, said at least one threshold being derived based on at least one condition related to the channel quality of at least one of the first carrier or the at least one second carrier for monitoring the LP-WUS on the first carrier; and In response to receiving LP-WUS or paging on the first carrier, at least one channel measurement of the at least one second carrier is evaluated to determine whether it satisfies the at least one threshold.

[0214] Example 1.2: The method according to Example 1.1, wherein the indication of at least one second carrier includes at least one of the following: The UE should attempt to respond to at least one paging cell. The UE should attempt to respond to at least one frequency band of the paging, or The UE should attempt to respond to at least one frequency of the paging.

[0215] Example 1.3: According to the method of Example 1.1 or Example 1.2, where paging is addressing the UE when the paging message includes the UE's identifier.

[0216] Example 1.4: Following the method of Example 1.3, where the identifier is S-TMSI (Temporary Mobile Subscription Identifier).

[0217] Example 1.5: Following the method of Example 1.3, where the identifier is I-RNTI (Inactive Radio Network Temporary Identifier).

[0218] Example 1.6: The method according to any one of Examples 1.1 to 1.5, wherein the first carrier and at least one second carrier have different frequencies.

[0219] Example 1.7: The method according to any one of Examples 1.1 to 1.6, wherein the first carrier and at least one second carrier are in different frequency bands.

[0220] Example 1.8: Using the method from any one of Examples 1.1 to 1.7, The first carrier is provided by the serving cell serving the UE, and At least one of the second carriers is provided by at least one second cell.

[0221] Example 1.9: The method according to any one of Examples 1.1 to 1.8, wherein the cell providing the first carrier and at least one cell providing at least one second carrier are provided by different base stations.

[0222] Example 1.10: The method according to any one of Examples 1.1 to 1.9, wherein the cell providing the first carrier and at least one cell providing at least one second carrier are in different frequency bands.

[0223] Example 1.11: Based on the method of any one of Examples 1.1 through 1.10, The condition used for monitoring LP-WUS on the first carrier, and related to the channel quality of at least one of the first carrier or at least one of the second carriers, includes at least one of the following: Entry conditions: If the entry conditions are met, then LP-WUS is monitored on the first carrier, or... Exit conditions: If the exit conditions are met, LP-WUS will not be monitored on the first carrier, and paging timing will be monitored on the first carrier. At least one of the thresholds is determined based on at least one of the entry or exit conditions.

[0224] Example 1.12: Following the method in Example 1.11, The entry conditions include an entry threshold, and the exit conditions include an exit threshold. At least one of the thresholds is determined based on the entry threshold and the exit threshold.

[0225] Example 1.13: Based on the method of any one of Examples 1.1 through 1.10, The at least one condition used for monitoring LP-WUS on the first carrier, which is related to the channel quality of at least one of the first carrier or at least one second carrier, includes an implementation-specific threshold. At least one of these thresholds is determined based on implementation-specific thresholds.

[0226] Example 1.14: Based on the method of any one of Examples 1.1 through 1.10, The condition used for monitoring LP-WUS on the first carrier, and related to the channel quality of at least one of the first carrier or at least one second carrier, includes a configured threshold. At least one of the thresholds is determined based on the configured threshold.

[0227] Example 1.15: Based on the method of any one of Examples 1.1 through 1.14,

[0228] At least one channel measurement of at least one second carrier includes measurements stored prior to receiving LP-WUS or paging on the first carrier. The evaluation is performed based on stored measurements.

[0229] Example 1.16: Based on the method of any one of Examples 1.1 through 1.15, At least one channel measurement of at least one second carrier includes measurements obtained after receiving LP-WUS or paging on the first carrier. The evaluation is performed based on the measurements obtained.

[0230] Example 1.17: Based on the method in Example 1.16, it also includes: Measurements are obtained using the UE’s primary radio based on at least one system synchronization block on at least one second carrier.

[0231] Example 1.18: The method based on any one of Examples 1.1 through 1.17 also includes: A random access procedure is initiated on at least one second carrier based on at least one channel measurement satisfying at least one determined threshold.

[0232] Example 1.19: The method based on any one of Examples 1.1 through 1.17 also includes: If at least one channel measurement on at least one second carrier fails to meet at least one determined threshold, a random access procedure is initiated on the first carrier.

[0233] Example 1.20: An apparatus comprising: At least one processor; and At least one memory, on which instructions are stored, which, when executed by at least one processor, cause the device to perform the method according to any one of Examples 1.1 to 1.19.

[0234] Example 1.21: A non-transitory processor-readable medium storing instructions that, when executed by at least one processor of a device, cause the device to perform a method according to any one of Examples 1.1-1.19.

[0235] Example 2.1: An apparatus comprising: Components configured to monitor low-power wake-up signals (LP-WUS) and paging on a first carrier and to respond to a paging received on the first carrier on at least one second carrier; The component for determining at least one threshold, the at least one threshold being derived based on at least one condition related to the channel quality of at least one of the first carrier or at least one second carrier, for monitoring LP-WUS on the first carrier; and A component for evaluating whether at least one channel measurement of at least one second carrier satisfies at least one determined threshold in response to receiving LP-WUS or paging on a first carrier.

[0236] Example 2.2: The apparatus according to Example 2.1, wherein the indication of at least one second carrier includes at least one of the following: The UE should attempt to respond to at least one paging cell. The UE should attempt to respond to at least one frequency band of the paging, or The UE should attempt to respond to at least one frequency of the paging.

[0237] Example 2.3: The apparatus according to Example 2.1 or Example 2.2, wherein paging is addressing the UE when the paging message includes the identifier of the UE.

[0238] Example 2.4: The apparatus according to Example 2.3, where the identifier is S-TMSI (Temporary Mobile Subscription Identifier).

[0239] Example 2.5: The apparatus according to Example 2.3, where the identifier is I-RNTI (Inactive Radio Network Temporary Identifier).

[0240] Example 2.6: An apparatus according to any one of Examples 2.1 to 2.5, wherein the first carrier and at least one second carrier have different frequencies.

[0241] Example 2.7: An apparatus according to any one of Examples 2.1 to 2.6, wherein the first carrier and at least one second carrier are in different frequency bands.

[0242] Example 2.8: An apparatus according to any one of Examples 2.1 to 2.7, The first carrier is provided by the serving cell serving the UE, and At least one of the second carriers is provided by at least one second cell.

[0243] Example 2.9: An apparatus according to any one of Examples 2.1 to 2.8, wherein the cell providing the first carrier and at least one cell providing at least one second carrier are provided by different base stations.

[0244] Example 2.10: An apparatus according to any one of Examples 2.1 to 2.9, wherein the cell providing the first carrier and at least one cell providing at least one second carrier are in different frequency bands.

[0245] Example 2.11: An apparatus according to any one of Examples 2.1 to 2.10, The condition used for monitoring LP-WUS on the first carrier, and related to the channel quality of at least one of the first carrier or at least one of the second carriers, includes at least one of the following: Entry conditions: If the entry conditions are met, then LP-WUS is monitored on the first carrier, or... Exit conditions: If the exit conditions are met, LP-WUS will not be monitored on the first carrier, and paging timing will be monitored on the first carrier. At least one of the thresholds is determined based on at least one of the entry or exit conditions.

[0246] Example 2.12: According to the apparatus of Example 2.11, The entry conditions include an entry threshold, and the exit conditions include an exit threshold. At least one of the thresholds is determined based on the entry threshold and the exit threshold.

[0247] Example 2.13: An apparatus according to any one of Examples 2.1 to 2.10, The at least one condition used for monitoring LP-WUS on the first carrier, which is related to the channel quality of at least one of the first carrier or at least one second carrier, includes an implementation-specific threshold. At least one of these thresholds is determined based on implementation-specific thresholds.

[0248] Example 2.14: An apparatus according to any one of Examples 2.1 to 2.10, The condition used for monitoring LP-WUS on the first carrier, and related to the channel quality of at least one of the first carrier or at least one second carrier, includes a configured threshold. At least one of the thresholds is determined based on the configured threshold.

[0249] Example 2.15: An apparatus according to any one of Examples 2.1 to 2.14,

[0250] At least one channel measurement of at least one second carrier includes measurements stored prior to receiving LP-WUS or paging on the first carrier. The evaluation is performed based on stored measurements.

[0251] Example 2.16: An apparatus according to any one of Examples 2.1 to 2.15, At least one channel measurement of at least one second carrier includes measurements obtained after receiving LP-WUS or paging on the first carrier. The evaluation is performed based on the measurements obtained.

[0252] Example 2.17: The apparatus according to Example 2.16 further includes: A component for obtaining measurements using the UE’s main radio based on at least one system synchronization block on at least one second carrier.

[0253] Example 2.18: The apparatus according to any one of Examples 2.1 to 2.17 further includes: A component for initiating a random access procedure on at least one second carrier based on at least one channel measurement on at least one second carrier satisfying at least one determined threshold.

[0254] Example 2.19: The apparatus according to any one of Examples 2.1 to 2.17 further includes: A component for initiating a random access procedure on a first carrier based on at least one channel measurement on at least one second carrier failing to meet at least one determined threshold.

[0255] The embodiments and aspects disclosed herein are examples of this disclosure and may be embodied in various forms. For example, although some embodiments herein are described as separate embodiments, each embodiment herein may be combined with one or more other embodiments herein. The specific structural and functional details disclosed herein should not be construed as limiting, but rather serve as the basis for the claims and as a representative basis for teaching those skilled in the art to employ this disclosure in various aspects of virtually any suitable detailed structure. Throughout the description of the drawings, similar reference numerals may refer to similar or identical elements.

[0256] The phrases “in one aspect,” “in all aspects,” “in various aspects,” “in some aspects,” or “in other aspects” may each refer to one or more of the same or different aspects according to this disclosure. The phrase “multiple” may refer to two or more.

[0257] The phrases “in one embodiment,” “in an embodiment,” “in various embodiments,” “in some embodiments,” or “in other embodiments” may each refer to one or more of the same or different embodiments according to this disclosure. The phrase “A or B” means “(A), (B), or (A and B).” The phrase “at least one of A, B, or C” means “(A); (B); (C); (A and B); (A and C); (B and C); or (A, B, and C).”

[0258] Any method, program, algorithm, or code described herein can be translated into or expressed in a programming language or computer program. The terms "programming language" and "computer program" as used herein each include any language used to specify instructions to a computer, and include (but are not limited to) the following languages ​​and their derivatives: assembler, Basic, batch files, BCPL, C, C++, Delphi, Fortran, Java, JavaScript, machine code, operating system command languages, Pascal, Perl, PL1, Python, scripting languages, Visual Basic, meta-languages ​​that specify the program itself, and all first-, second-, third-, fourth-, fifth-, or later generation computer languages. Databases and other data modalities, as well as any other meta-languages, are also included. No distinction is made between interpreted languages, compiled languages, or languages ​​that use both compiled and interpreted methods. No distinction is made between a compiled version and a source version of a program. Therefore, a reference to a program is a reference to any and all such states, where a programming language can exist in more than one state (such as source, compilation, object, or link). References to a program can cover the actual instructions and / or the intent of those instructions.

[0259] While various aspects of this disclosure have been shown in the accompanying drawings, this is not to imply that the disclosure is limited thereto, as it implies that the disclosure is as broad as permitted by the art, and the specification is to be interpreted accordingly. Therefore, the foregoing description should not be construed as restrictive, but merely as an example of particular aspects. Other modifications will be contemplated by those skilled in the art within the scope and spirit of the appended claims.

Claims

1. A device for communication, comprising: At least one processor; as well as At least one memory, wherein instructions are stored thereon, which, when executed by the at least one processor, cause the device to perform at least the following: Configured to monitor a low-power wake-up signal LP-WUS and a paging on a first carrier, and to respond to the paging received on the first carrier on at least one second carrier; At least one threshold is determined, the at least one threshold being derived based on at least one condition related to the channel quality of at least one of the first carrier or the at least one second carrier for monitoring the LP-WUS on the first carrier; as well as In response to receiving the LP-WUS or the paging on the first carrier, an assessment is made as to whether at least one channel measurement of the at least one second carrier satisfies the determined at least one threshold.

2. The apparatus of claim 1, wherein the indication of at least one second carrier comprises at least one of the following: The user equipment (UE) should attempt to respond to the instruction of at least one cell in the paging. The UE should attempt to respond to an indication of at least one frequency band of the paging, or The UE should attempt to respond to an indication of at least one frequency of the paging.

3. The apparatus of claim 1 or claim 2, wherein the paging is addressing the UE when the paging message of the paging includes an identifier of the user equipment (UE).

4. The apparatus of claim 3, wherein the identifier is a Temporary Mobile Subscription Identifier (S-TMSI); or The identifier mentioned therein is the Inactive Wireless Network Temporary Identifier (I-RNTI).

5. The apparatus according to claim 1 or 2, wherein the first carrier and the at least one second carrier have different frequencies; or The first carrier and the at least one second carrier are in different frequency bands.

6. The apparatus according to claim 1 or 2, The first carrier is provided by the serving cell serving the user equipment (UE), and The at least one second carrier is provided by at least one second cell.

7. The apparatus according to claim 1 or 2, wherein the cell providing the first carrier and the at least one cell providing the at least one second carrier are provided by different base stations, wherein the cell providing the first carrier and the at least one cell providing the at least one second carrier are in different frequency bands.

8. The apparatus according to claim 1 or 2, The at least one condition used for monitoring LP-WUS on the first carrier, and related to the channel quality of at least one of the first carrier or the at least one second carrier, includes at least one of the following: Entry conditions, if the entry conditions are met, then LP-WUS is monitored on the first carrier, or The exit condition, if met, causes LP-WUS to cease monitoring on the first carrier and causes paging timing to be monitored on the first carrier. The at least one threshold is determined based on at least one of the entry condition or the exit condition.

9. The apparatus according to claim 1 or 2, The at least one condition used for monitoring LP-WUS on the first carrier, and related to the channel quality of at least one of the first carrier or the at least one second carrier, includes an implementation-specific threshold, and The at least one threshold is determined based on the implementation-specific threshold; or The at least one condition used for monitoring LP-WUS on the first carrier, and related to the channel quality of at least one of the first carrier or the at least one second carrier, includes a configured threshold, and The at least one threshold is determined based on the threshold configured thereon.

10. The apparatus according to claim 1 or 2, The at least one channel measurement of the at least one second carrier includes measurements stored prior to receiving the LP-WUS or the paging on the first carrier, and The evaluation is performed based on the stored measurements; or The at least one channel measurement of the at least one second carrier includes measurements obtained after receiving the LP-WUS or the paging on the first carrier, and The evaluation is performed based on the obtained measurements.

11. The apparatus of claim 10, wherein the instructions, when executed by the at least one processor, further cause the apparatus to perform at least: The measurement is obtained using the primary radio of the user equipment (UE) based on at least one system synchronization block on at least one second carrier.

12. The apparatus of claim 1 or 2, wherein the instructions, when executed by the at least one processor, further cause the apparatus to perform at least: Based on the at least one channel measurement on the at least one second carrier satisfying the at least one determined threshold, a random access procedure is initiated on the at least one second carrier; or The instructions, when executed by the at least one processor, also cause the device to perform at least the following: If the at least one channel measurement on the at least one second carrier does not meet the determined at least one threshold, a random access procedure is initiated on the first carrier.

Images