Paging reception for user equipment in idle and inactive states

Abstract

The invention relates to paging reception of user equipment in idle and inactive states. A network device (e.g., a user equipment (UE), a new radio NB (gNB), or other network component) may handle or generate a one-step or two-step paging reception based on a sub-state in an idle mode. The UE may enter an idle state to achieve reduced power consumption of the battery, and further reduce power consumption by monitoring only the PDCCH in response to operating in any camp-on state, and eliminating processing of paging messages while in the any camp-on state.

Description

[0001] CROSS-REFERENCE TO RELATED APPLICATIONS

[0002] This application is a divisional application of the invention patent application with international application number PCT / US2019 / 05317, international application date September 26, 2019, date of entry into the Chinese national phase February 10, 2021, Chinese national application number 201980053930.4, and invention name “Paging reception of user equipment in idle and inactive states”.

[0003] This application claims the benefit of U.S. Provisional Application No. 62 / 737,671, filed September 27, 2018, entitled “PAGING RECEPTION FOR USER EQUIPMENT IN IDLE AND INACTIVE STATE,” the contents of which are incorporated herein by reference in their entirety. Technical Field

[0004] The present disclosure relates to wireless technology and, more particularly, to paging reception in idle and inactive states. Background Art

[0005] Mobile communications have made remarkable progress over the past two decades, evolving from early voice systems to today's highly complex, integrated communications platforms. 5G, or New Radio (NR), the next generation of wireless communications, is poised to deliver ubiquitous connectivity and access to information and the ability to share data globally. NR is envisioned as a unified framework designed to meet a wide range of, and sometimes conflicting, performance standards and provide services for very different application areas, ranging from enhanced mobile broadband (eMBB) to massive machine-type communications (mMTC) and ultra-reliable low-latency communications (URLLC), to name a few. In general, NR will evolve based on the 3rd Generation Partnership Project (3GPP) Long Term Evolution (LTE-Advanced) technology, along with additional enhanced radio access technologies (RATs) to enable seamless and faster wireless connectivity solutions.

[0006] A major enhancement to LTE in Rel-13 was the ability for cellular networks to operate in unlicensed spectrum via Licensed Assisted Access (LAA). 3GPP has since considered access to unlicensed spectrum as a promising solution to the increasing volume of wireless data traffic. One of the key considerations for LTE operating in unlicensed spectrum is ensuring fair coexistence with existing systems such as wireless local area networks (WLANs), a primary focus of LAA standardization work since Rel-13.

[0007] Following the trend of LTE enhancements, research on NR-based access to unlicensed spectrum (NR-Unlicensed) is underway, starting from 3GPP Release (Rel)-15. The channel access mechanism aspect is one of the basic building blocks of NR-Unlicensed for deployment options. In addition to meeting regulatory requirements, the adoption of Listen Before Talk (LBT) in LTE-based LAA systems is also critical to achieving fair coexistence with adjacent systems sharing the unlicensed spectrum. In order to provide a global solution with a unified framework, NR-based Unlicensed access will also use a channel access mechanism based on LBT. Since wideband operation is one of the key building blocks for realizing NR-Unlicensed operation, it is crucial to support mechanisms that will promote wideband operation by utilizing dynamic bandwidth adaptation in an effective manner. BRIEF DESCRIPTION OF THE DRAWINGS

[0008] Figure 1 is a block diagram illustrating an example of a user equipment (UE) and a gNB or access node in a network having network components that can be used in conjunction with various embodiments (aspects) described herein.

[0009] Figure 2 is a block diagram illustrating a system that may be employed at a UE or gNB according to various embodiments described herein.

[0010] Figure 3 is another block diagram illustrating two-step or one-step paging reception based on UE sub-state according to various embodiments described herein.

[0011] Figure 4 is another block diagram illustrating sub-state transitions within the Idle and Inactive states according to various embodiments described herein.

[0012] Figure 5 is a block diagram illustrating an exemplary process flow for power reduction in idle mode according to various embodiments described herein. DETAILED DESCRIPTION

[0013] The present disclosure will now be described with reference to the accompanying drawings, wherein similar figures are used to refer to similar elements throughout the text, and the structures and devices shown therein need not be drawn to scale. As used herein, the terms "component", "system", "interface" etc. are intended to refer to entities, hardware, software (e.g., in execution) and / or firmware related to a computer. For example, a component can be a processor (e.g., a microprocessor, a controller or other processing device), a process running on a processor, a controller, an object, an executable file, a program, a storage device, a computer, a tablet computer and / or a user equipment (e.g., a mobile phone, etc.) with a processing device. By way of example, an application and a server running on a server can also be a component. One or more components can reside in a process, and a component can be located on a computer and / or distributed between two or more computers. This article can describe a set of elements or other sets of components, wherein the term "set" can be interpreted as "one or more".

[0014] In addition, these components can execute from various computer-readable storage media having various data structures stored thereon, such as using modules, for example. Components can communicate via local and / or remote processes, such as according to signals having one or more data packets (e.g., data from one component interacts with another component in a local system, a distributed system, and / or throughout a network, such as the Internet, a local area network, a wide area network, or a similar network with other systems via signals).

[0015] As another example, a component can be a device that has a specific function, where the specific function is provided by mechanical components that operate through electrical or electronic circuitry, where the electrical or electronic circuitry can be operated by software applications or firmware applications executed by one or more processors. The one or more processors can be internal or external to the device and can execute at least a portion of the software or firmware application. As another example, a component can be a device that provides a specific function through electronic components without the need for mechanical components; the electronic components can include one or more processors to execute at least a portion of the software and / or firmware that provides the electronic components with their functions.

[0016] The use of the word "exemplary" is intended to present concepts in a concrete manner. As used in this application, the term "or" is intended to mean an inclusive "or" rather than an exclusive "or." That is, unless otherwise specified or clear from the context, "X employs A or B" is intended to mean any natural inclusive permutation. That is, if X employs A; X employs B; or X employs both A and B, then "X employs A or B" is satisfied in any of the foregoing cases. In addition, the articles "a" and "an" as used in this application and the appended claims should generally be construed to mean "one or more," unless otherwise specified or clear from the context to be directed to the singular. Furthermore, to the extent that the terms "comprising," "including," "having," "having," "with," or variations thereof are used in the detailed description and claims, such terms are intended to be inclusive in a manner similar to the term "comprising." Furthermore, where one or more numbered items are discussed (e.g., "a first X," "a second X," etc.), generally, the one or more numbered items can be different or they can be the same, but in some cases, the context may indicate that they are different or that they are the same.

[0017] As used herein, the term "circuit" may refer to, may be a part of, or may include an application specific integrated circuit (ASIC), an electronic circuit, a processor (shared, dedicated, or group), or associated memory (shared, dedicated, or group) operably coupled to the circuit that executes one or more software or firmware programs, a combinational logic circuit, or other suitable hardware components that provide the described functionality. In some embodiments, the circuit may be implemented in one or more software or firmware modules, or the functionality associated with the circuit may be implemented by one or more software or firmware modules. In some embodiments, the circuit may include logic components that may operate at least partially in hardware.

[0018] The embodiments described herein may be implemented into a system or network device using any suitably configured hardware and / or software. Figure 1The architecture of a system 100 of a network according to an embodiment of the present invention is shown. System 100 is shown to include user equipment (UE) 101 and UE 102. As used herein, the term "user equipment" or "UE" may refer to a device with radio communication capabilities and may describe a remote user of network resources in a communication network. In addition, the term "user equipment" or "UE" may be considered synonymous with and may be referred to as a client, mobile phone, mobile device, mobile terminal, user terminal, mobile unit, mobile station, mobile user, subscriber, user, remote station, access agent, user agent, receiver, radio equipment, reconfigurable radio equipment, reconfigurable mobile device, etc. In addition, the term "user equipment" or "UE" may include any type of wireless / wired device or any computing device that includes a wireless communication interface. In this example, UEs 101 and 102 are shown as smartphones (e.g., handheld touchscreen mobile computing devices that can connect to one or more cellular networks), but may also include any mobile or non-mobile computing device, such as consumer electronic devices, cellular phones, smartphones, feature phones, tablets, wearable computer devices, personal digital assistants (PDAs), pagers, wireless handheld devices, desktop computers, laptop computers, in-vehicle infotainment (IVI), in-car entertainment (ICE) devices, instrument clusters (ICs), heads-up display (HUD) devices, on-board diagnostic (OBD) devices, dashtop mobile equipment (DME), mobile data terminals (MDTs), electronic engine management systems (EEMS), electronic / engine electronic control units (ECUs), electronic / engine electronic control modules (ECMs), embedded systems, microcontrollers, control modules, engine management systems (EMS), connected or “smart” appliances, machine type communication (MTC) devices, machine-to-machine (M2M), Internet of Things (IoT) devices, etc.

[0019] In some embodiments, either UE 101 or UE 102 may comprise an Internet of Things (IoT) UE, which may include a network access layer designed for low-power IoT applications that utilize short-lived UE connections. The IoT UE may utilize technologies such as machine-to-machine (M2M) or machine-type communication (MTC) to exchange data with an MTC server or device via a public land mobile network (PLMN), proximity-based services (ProSe), or device-to-device (D2D) communications, a sensor network, or an IoT network. The M2M or MTC data exchange may be a machine-initiated data exchange. The IoT network describes interconnected IoT UEs, which may include uniquely identifiable embedded computing devices (within the Internet infrastructure) with short-lived connections. The IoT UE may execute background applications (e.g., keep-alive messages, status updates, etc.) to facilitate connectivity to the IoT network.

[0020] UE 101 and UE 102 may be configured to connect or communicatively couple to a radio access network (RAN) 110. RAN 110 may be, for example, an Evolved Universal Mobile Telecommunications System (UMTS) Terrestrial Radio Access Network (E-UTRAN), a Next Generation RAN (NGRAN), or some other type of RAN. UE 101 and UE 102 utilize connection (or channel) 103 and connection (or channel) 104, respectively, each of which includes a physical communication interface or layer (discussed in further detail below). As used herein, the term "channel" may refer to any tangible or intangible transmission medium for transmitting data or data streams. The term "channel" may be synonymous and / or equivalent to "communication channel," "data communication channel," "transmission channel," "data transmission channel," "access channel," "data access channel," "link," "data link," "carrier," "radio frequency carrier," and / or any other similar terms representing a path or medium through which data is transmitted. Additionally, the term "link" may refer to a connection between two devices over a radio access technology (RAT) for the purpose of transmitting and receiving information. In this example, connection 103 and connection 104 are shown as air interfaces to achieve communication coupling and can be consistent with cellular communication protocols, such as the Global System for Mobile Communications (GSM) protocol, the Code Division Multiple Access (CDMA) network protocol, the Push-to-Talk (PTT) protocol, the Cellular PTT protocol (POC), the Universal Mobile Telecommunications System (UMTS) protocol, the 3GPP Long Term Evolution (LTE) protocol, the Fifth Generation (5G) protocol, the New Radio (NR) protocol, etc.

[0021] In this embodiment, UEs 101 and 102 may also exchange communication data directly via the ProSe interface 105. The ProSe interface 105 may alternatively be referred to as a sidelink (SL) interface comprising one or more logical channels, including but not limited to a physical sidelink control channel (PSCCH), a physical sidelink shared channel (PSSCH), a physical sidelink discovery channel (PSDCH), and a physical sidelink broadcast channel (PSBCH). In various implementations, the SL interface 105 may be used for vehicular applications and communication technologies, which are generally referred to as V2X systems. V2X is a communication mode in which UEs (e.g., UEs 101, 102) communicate with each other directly via the PC5 / SL interface 105, and may occur when UEs 101, 102 are served by RAN nodes 111, 112 or when one or more UEs are outside the coverage area of RAN 110. V2X can be categorized into four different types: vehicle-to-vehicle (V2V), vehicle-to-infrastructure (V2I), vehicle-to-network (V2N), and vehicle-to-pedestrian (V2P). These V2X applications can use "cooperative awareness" to provide smarter services to end users. For example, vehicle UEs (vUEs) 101, 102, RAN nodes 111, 112, application servers 130, and pedestrian UEs 101, 102 can collect knowledge of their local environment (e.g., information received from other vehicles or nearby sensor equipment) to process and share this knowledge in order to provide smarter services such as cooperative collision warnings, autonomous driving, etc. In these specific implementations, the UEs 101, 102 can be implemented as / used as vehicle embedded communication systems (VECS) or vUEs.

[0022] UE 102 is shown configured to access access point (AP) 106 (also referred to as "WLAN node 106," "WLAN 106," "WLAN termination 106," or "WT 106," etc.) via connection 107. Connection 107 may include a local wireless connection, such as a connection consistent with any IEEE 802.11 protocol, wherein AP 106 may include Wireless Fidelity. router. In this example, AP 106 is shown connected to the Internet without being connected to the core network of the wireless system (described in further detail below). In various embodiments, UE 102, RAN 110, and AP 106 can be configured to utilize LTE-WLAN aggregation (LWA) operation and / or WLAN LTE / WLAN radio level operation integrated with IPsec tunneling (LWIP). LWA operation may involve RAN nodes 111, 112 configuring UE 102 in the RRC_CONNECTED state to utilize radio resources of LTE and WLAN. LWIP operation may involve UE 102 using WLAN radio resources (e.g., connection 107) via an Internet Protocol security (IPsec) protocol tunnel to authenticate and encrypt packets (e.g., Internet Protocol (IP) packets) sent over connection 107. IPsec tunneling may include encapsulating the entire original IP packet and adding a new packet header, thereby protecting the original header of the IP packet.

[0023] The RAN 110 may include one or more access nodes that enable connection 103 and connection 104. As used herein, the terms "access node," "access point," and the like may describe equipment that provides radio baseband functionality for data and / or voice connections between a network and one or more users. These access nodes may be referred to as base stations (BSs), Node Bs, evolved Node Bs (eNBs), next generation Node Bs (gNBs), RAN nodes, roadside units (RSUs), and the like, and may include ground stations (e.g., terrestrial access points) or satellite stations that provide coverage within a geographic area (e.g., a cell). The term "roadside unit" or "RSU" may refer to any transport infrastructure entity implemented in or by a gNB / eNB / RAN node or a stationary (or relatively stationary) UE, where an RSU implemented in or by a UE may be referred to as a "UE-type RSU" and an RSU implemented in or by an eNB may be referred to as an "eNB-type RSU." The RAN 110 may include one or more RAN nodes for providing macro cells, such as the macro RAN node 111, and one or more RAN nodes for providing femto cells or pico cells (e.g., cells with smaller coverage, smaller user capacity, or higher bandwidth than macro cells), such as the low power (LP) RAN node 112.

[0024] Either RAN node 111 or RAN node 112 may terminate the air interface protocol and may be the first point of contact for UE 101 or UE 102. In some embodiments, either RAN node 111 or 112 may fulfill various logical functions of the RAN 110, including, but not limited to, functions of a radio network controller (RNC), such as radio bearer management, uplink and downlink dynamic radio resource management, data packet scheduling, and mobility management.

[0025] According to some embodiments, UE 101 and UE 102 may be configured to communicate with each other or with any of RAN nodes 111 and 112 over a multi-carrier communication channel using orthogonal frequency division multiplexing (OFDM) communication signals according to various communication techniques, such as, but not limited to, orthogonal frequency division multiple access (OFDMA) communication techniques (e.g., for downlink communication) or single-carrier frequency division multiple access (SC-FDMA) communication techniques (e.g., for uplink and ProSe or sidelink communication), although the scope of the embodiments is not limited in this respect. The OFDM signal may include multiple orthogonal subcarriers.

[0026] In some embodiments, a downlink resource grid can be used for downlink transmissions from either RAN node 111 or RAN node 112 to UE 101 or UE 102, while uplink transmissions can utilize similar techniques. The grid can be a time-frequency grid, referred to as a resource grid or time-frequency resource grid, which represents the physical resources in the downlink per time slot. This type of time-frequency plane representation is common for OFDM systems, making radio resource allocation intuitive. Each column and row of the resource grid corresponds to an OFDM symbol and an OFDM subcarrier, respectively. The duration of the resource grid in the time domain corresponds to a time slot in a radio frame. The smallest time-frequency unit in the resource grid is represented as a resource element. Each resource grid includes multiple resource blocks, which describe the mapping of certain physical channels to resource elements. Each resource block includes a collection of resource elements. In the frequency domain, this can represent the minimum amount of resources that can currently be allocated. Such resource blocks are used to transmit several different physical downlink channels.

[0027] The physical downlink shared channel (PDSCH) can carry user data and higher-layer signaling to UEs 101 and 102. The physical downlink control channel (PDCCH) can carry information about the transport format and resource allocation related to the PDSCH channel. It can also inform UEs 101 and 102 of the transport format, resource allocation, and H-ARQ (Hybrid Automatic Repeat Request) information related to the uplink shared channel. Typically, downlink scheduling (allocation of control and shared channel resource blocks to UE 102 within a cell) can be performed on either RAN node 111 or 112 based on channel quality information fed back from either UE 101 or 102. Downlink resource allocation information can be sent on the PDCCH for (e.g., allocated to) each of UEs 101 and 102.

[0028] PDCCH can use control channel elements (CCE) to transmit control information. Before being mapped to resource elements, the PDCCH complex-valued symbols can first be organized into quadruples, which can then be arranged using a sub-block interleaver for rate matching. One or more of these CCEs can be used to transmit each PDCCH, where each CCE can correspond to a set of four physical resource elements of nine, called resource element groups (REGs). Four quadrature phase shift keying (QPSK) symbols can be mapped to each REG. Depending on the size of the downlink control information (DCI) and the channel conditions, one or more CCEs can be used to transmit the PDCCH. There may be four or more different PDCCH formats defined in LTE with different numbers of CCEs (e.g., aggregation levels, L=1, 2, 4, 8, etc.).

[0029] Some embodiments may use the concept of resource allocation for control channel information, which is an extension of the above concept. For example, some embodiments may utilize an enhanced physical downlink control channel (EPDCCH) that uses PDSCH resources for control information transmission. One or more enhanced control channel elements (ECCEs) may be used to transmit EPDCCH. Similar to the above, each ECCE may correspond to a set of four physical resource elements of nine, referred to as an enhanced resource element group (EREG). In some cases, an ECCE may have other numbers of EREGs.

[0030] RAN 110 is shown as being communicatively coupled to a core network (CN) 120 via an S1 interface 113. In an embodiment, CN 120 may be an evolved packet core (EPC) network, a next generation packet core (NPC) network, or some other type of CN. In this embodiment, S1 interface 113 is divided into two parts: an S1-U interface 114, which carries traffic data between RAN nodes 111 and 112 and a serving gateway (S-GW) 122; and an S1-Mobility Management Entity (MME) interface 115, which is a signaling interface between RAN nodes 111 and 112 and MME 121. The embodiments herein are also applicable to the 5G system architecture in a new radio (NR) access network, as also mentioned in TS 23.501.

[0031] In this embodiment, CN 120 includes MME 121, S-GW 122, Packet Data Network (PDN) Gateway (P-GW) 123, and Home Subscriber Server (HSS) 124. MME 121 can be similar in function to the control plane of a conventional Serving General Packet Radio Service (GPRS) Support Node (SGSN). MME 121 can manage mobility aspects of access, such as gateway selection and tracking area list management. HSS 124 can include a database for network users, including subscription-related information to support network entities in handling communication sessions. Depending on the number of mobile subscribers, the capacity of the devices, the organization of the network, etc., CN 120 can include one or more HSSs 124. For example, HSS 124 can provide support for routing / roaming, authentication, authorization, naming / addressing resolution, location dependency, etc.

[0032] The S-GW 122 may terminate the S1 interface 113 toward the RAN 110 and route data packets between the RAN 110 and the CN 120. Additionally, the S-GW 122 may be the local mobility anchor for inter-RAN node handovers and may also provide an anchor for inter-3GPP mobility. Other responsibilities may include lawful interception, charging, and enforcement of certain policies.

[0033] The P-GW 123 may terminate the SGi interface toward the PDN. The P-GW 123 may route data packets between the EPC network 120 and external networks, such as a network including an application server 130 (alternatively referred to as an application function (AF)), via an Internet Protocol (IP) interface 125. Generally speaking, the application server 130 may be an element that provides applications that use IP bearer resources with the core network (e.g., UMTS packet service (PS) domain, LTE PS data services, etc.). In this embodiment, the P-GW 123 is shown as being communicatively coupled to the application server 130 via the IP communication interface 125. The application server 130 may also be configured to support one or more communication services (e.g., Voice over Internet Protocol (VoIP) sessions, PTT sessions, group communication sessions, social networking services, etc.) for the UE 101 and UE 102 via the CN 120.

[0034] P-GW 123 may also be a node for policy enforcement and charging data collection. Policy and Charging Rules Function (PCRF) 126 is the policy and charging control element of CN 120. In a non-roaming scenario, there may be a single PCRF in the Home Public Land Mobile Network (HPLMN) associated with the UE's Internet Protocol Connectivity Access Network (IP-CAN) session. In a roaming scenario with local traffic breakout, there may be two PCRFs associated with the UE's IP-CAN session: a Home PCRF (H-PCRF) in the HPLMN and a Visited PCRF (V-PCRF) in the Visited Public Land Mobile Network (VPLMN). PCRF 126 may be communicatively coupled to application server 130 via P-GW 123. Application server 130 may signal PCRF 126 to indicate a new service flow and select appropriate quality of service (QoS) and charging parameters. PCRF 126 may provide the rules to a Policy and Charging Enforcement Function (PCEF) (not shown) using the appropriate Traffic Flow Template (TFT) and QoS Class of Identifier (QCI), as specified by application server 130, which initiates QoS and charging.

[0035] See also Figure 2, a block diagram of a system / device 200 that can be employed at a UE (e.g., UE 101 / 102) or another network device (e.g., gNB / eNB 111 / 112) to facilitate one or more aspects / implementations herein. System 200 may include: one or more processors 210 (e.g., one or more baseband processors, such as one or more baseband processors discussed in conjunction with other figures), including processing circuitry and associated interfaces; transceiver circuitry 220 (e.g., including part or all of RF circuitry, which may include transmitter circuitry (e.g., associated with one or more transmit chains) and / or receiver circuitry (e.g., associated with one or more receive chains), where the transmitter circuitry and the receiver circuitry may employ common circuit elements, different circuit elements, or a combination thereof); and memory 230 (which may include any of a variety of storage media and may store instructions and / or data associated with one or more of processor 210 or transceiver circuitry 220).

[0036] If there is no data traffic activity for an extended period of time, the device 200 may transition to the RRC_Idle state (also known as idle mode), in which it is disconnected from the network and does not perform operations such as channel quality feedback, handover, etc.; or alternatively transition to the RRC_INACTIVE state, in which it monitors paging messages with the previous communication configuration stored when it was previously connected (RRC_CONNECTED). The UE can also monitor paging in the RRC_INACTIVE state. The main difference between the idle and inactive states is that the UE stores the previous configuration (and this is not necessarily mainly the paging configuration) and the RNA update process. The device 200 enters a very low power state and it performs paging reception in which the device wakes up again periodically to listen to the network and then enters low power again. The device 200 cannot receive data in this state and in order to receive data, it must transition back to the RRC_Connected state.

[0037] The tasks in the RRC_IDLE and RRC_INACTIVE states can be broken down into three processes: PLMN selection; cell selection and reselection; and location registration and Notification Area (RNA) updates over the Radio Access Network (RAN). PLMN selection, cell reselection, and location registration are common to both the RRC_IDLE and RRC_INACTIVE states. RNA updates apply only to the RRC_INACTIVE state. When, for example, the UE 101 selects a new PLMN, the UE 101 transitions from RRC_INACTIVE to RRC_IDLE.

[0038] When the UE is switched on, a public land mobile network (PLMN) is selected by the non-access stratum (NAS). For the selected PLMN, the associated radio access technology (RAT) can be set as indicated in 3GPP TS 23.122. The NAS provides the access stratum (AS) with a list of equivalent PLMNs (if available) for cell selection and cell reselection. With cell selection, the UE 101 searches for a suitable cell of the selected PLMN, selects that cell to provide available services, and monitors its control channel. This process is referred to as or defined as "camping on / being camped on a cell."

[0039] The UE 101 may then register its presence in the tracking area of the selected cell through a NAS registration procedure.As a result of a successful location registration, the selected PLMN then becomes the registered PLMN according to 3GPP TS 23.122.

[0040] If UE 101 finds a more suitable cell, it reselects to that cell and camps on it according to the cell reselection criteria. If the new cell does not belong to at least one tracking area to which the UE is registered, a location registration is performed. In the RRC_INACTIVE state, if the new cell does not belong to a configured RNA, an RNA update procedure is performed.

[0041] UE 101 may search for a higher priority PLMN at regular intervals as described in 3GPP TS 23.122 and search for a suitable cell when another PLMN has been selected by the NAS. UEs (e.g., 101, 102) that have only services that do not require registration do not perform registration. Although UE 101 is used in the discussion herein, any UE or UE 102 may be referred to or applicable, and the embodiments / descriptive aspects herein are not necessarily limited to, for example, any UE or any base station gNB or eNB (e.g., 111).

[0042] The purpose of camping on a cell in the RRC_IDLE and RRC_INACTIVE states is fourfold: a) it enables the UE to receive system information from the PLMN; b) when registered and if the UE wishes to establish an RRC connection or resume a suspended RRC connection, the UE can do so by initially accessing the network on the control channel of the cell on which the UE is camped; c) if the network needs to send a message or deliver data to a registered UE, it knows (in most cases) the set of tracking areas (in the RRC_IDLE state) or RNAs (in the RRC_INACTIVE state) in which the UE 101 is camped (note: it can then send a "paging" message for the UE 101 on the control channels of all cells in the corresponding set of areas, which the UE then receives and can respond to); and d) it enables the UE to receive ETWS and CMAS notifications.

[0043] The following three levels of service are provided when the UE 101 is in the RRC_IDLE state: - Limited service (emergency calls, ETWS, and CMAS on acceptable cells); - Normal service (for public use on suitable cells); - Operator service (for operators only on reserved cells). The following two levels of service are provided when the UE is in the RRC_INACTIVE state: - Normal service (for public use on suitable cells); - Operator service (for operators only on reserved cells).

[0044] When transitioning from RRC_CONNECTED to RRC_IDLE state or RRC_INACTIVE state, UE 101 attempts to camp on a suitable cell, for example, based on redirectedCarrierInfo (if included in the RRCRelease message used for the transition). If UE 101 cannot find a suitable cell, UE 101 may camp on any suitable cell of the indicated RAT. This may also occur at power-up, not just when transitioning from Connected to IDLE / INACTIVE. If the RRCRelease message does not include redirectedCarrierInfo, the UE should attempt to select a suitable cell on the NR carrier. If no suitable cell is found according to the above method, the UE should perform cell selection using the stored information to find a suitable cell to camp on.

[0045] When the UE returns to the RRC_IDLE state after moving from the camped on any cell state to the RRC_CONNECTED state, the UE shall attempt to camp on an acceptable cell based on the redirectedCarrierInfo (if included in the RRCRelease message). If the UE cannot find an acceptable cell, the UE is allowed to camp on any acceptable cell of the indicated radio access technology (RAT). If the RRCRelease message does not contain redirectedCarrierInfo, the UE 101 may attempt to select an acceptable cell on the NR frequency. If an acceptable cell is not found according to the above method, the UE continues to search for an acceptable cell of any PLMN in any cell selection state.

[0046] When a UE in an idle or inactive state receives a paging message, it first receives a physical downlink control channel (PDCCH) downlink control information (DCI) for radio resource allocation for a radio resource control (RRC) paging message, and then receives the RRC paging message in a physical data channel or a physical downlink shared channel (PDSCH) using the allocated radio resources. Power conservation of the UE 101 in an idle or inactive state is important for enhancing power conservation or reducing power consumption during paging reception, which is the goal of the embodiments herein.

[0047] The UE behavior in idle and inactive states (modes) is defined in 3GPP specification TS 38.304. The idle state and the inactive state are a type of UE power saving state. The sub-states of the UE in the idle state / mode and the inactive state / mode can be defined as "normal camped state" or "camped on / in any cell state". INACTIVE is not in the "camped on any cell state". For example, if the UE cannot find a suitable cell (a cell of a PLMN in which the UE can successfully register) according to the UE's subscription, the UE is in the camped on any cell state in an acceptable cell. From an RF perspective, the suitable cell must also be acceptable. In addition, in both cases (i.e., normal camped state and camped on any cell state), the UE 101 receives paging, for example, because paging reception includes two steps (i.e., PDCCH DCI reception and associated PDSCH reception through allocated radio resources). However, according to the embodiment of this invention, based on the sub-state, the UE only needs to perform one-step reception or two-step reception.

[0048] When camped normally (normal camped / in normal camping state), UE 101 performs the following tasks: - monitors the paging channel of the cell according to the information broadcast in the system information block SIB1 as specified in clause 7; - monitors the relevant system information as specified in TS 38.331; - performs necessary measurements for the cell reselection evaluation process; - performs the cell reselection evaluation process on the following occasions / triggers: 1) UE internal triggering to meet the performance as specified in TS 38.133; 2) when the information on the broadcast control channel (BCCH) used for the cell reselection evaluation process has been modified.

[0049] The Camped on Any Cell state applies only to the RRC_IDLE state or idle mode. In this state, the UE performs the following tasks: - Monitors the cell's paging channel based on the information broadcast in SIB1 as specified in clause 7. There are different reasons for monitoring the paging channel for the Camped on Any Cell state and the Camped on Any Cell state – for paging messages for incoming DL traffic (for Camped on Any Cell only), and for indications of the presence of warning messages and system information changes (for both states). The UE also performs the following tasks: - Monitors relevant system information as specified in TS 38.331; - Performs necessary measurements for the cell reselection evaluation procedure; - Performs the cell reselection evaluation procedure on the following occasions / triggers: 1) UE internal trigger to meet the requirements as specified in TS 38.133; 2) When the information on the BCCH used for the cell reselection evaluation procedure has been modified; - Periodically tries all frequencies of all RATs supported by the UE to find a suitable cell. If a suitable cell is found, the UE 101 moves to the Camped on Any Cell state.

[0050] In various embodiments herein, paging reception can be enhanced depending on the UE's sub-states in idle and inactive modes. When in the normal camp state, two-step paging reception (i.e., PDCCH DCI reception and associated PDSCH reception using allocated radio resources) is applied to UE 101. When in the camp on any cell state, one-step paging reception (i.e., only PDCCH DCI reception) is applied to UE 101. By applying one-step paging reception to the UE in the camp on any cell state, less power is consumed than when two-step paging reception is always applied in both sub-states.

[0051] See also Figure 3 , shows an exemplary process flow 300 for paging reception in idle mode, according to an embodiment. At 302, UE 101 determines its sub-state in idle and inactive states. Figure 4How to determine its sub-states is also shown in FIG, which complies with the definition of suitable cells and acceptable cells as defined in TS 38.304, where the details of sub-clauses 5.2.3.2 and 5.3.1 may be referred to in 3GPP TS 38.304 of Release 15 or higher.

[0052] At 304, UE 101 determines whether it is in the normal camp state. If so, the UE is in the normal camp state, it is able to receive calls and transition to the connected state, thus monitoring whether it is contacted or not. If so, UE 101 receives / processes paging in two steps at 306 (i.e., first receives the paging PDCCH DCI, and then receives the paging message in the PDSCH using the resources allocated via the PDCCH DCI). If UE 101 is not in the normal camp state sub-state, UE 101 determines at 308 whether it is in the camp on any cell state. If in the camp on any cell state, UE 101 selects a cell regardless of the public land mobile network (PLMN). This is the case where UE 101 is not on a subscribed network cell, but uses any cell from which it can receive messages such as early warning messages (e.g., ETWS messages, CMAS messages, etc.) or indications of system information changes. Therefore, if UE 101 is not in the normal camped state sub-state and UE 101 is in the camped on any cell state, UE 101 receives paging in one step (i.e., only receives paging PDCCH DCI) at 310. Here, UE 101 only monitors the PDCCH for at least one of the following conditions: an indication of the presence of an early warning system message or a system information change indication in the PDCCH.

[0053] If the UE is neither in the normal camped state nor in the camped on any cell state, the UE 101 processes the flow to 312, where the UE follows the specified behavior defined in 3GPP TS 38.304. To enable one-step paging reception for the UE 101 in the camped on any cell state at 310, the network (or eNB / gNB 111 or other network component) may ensure that there is no callback to the UE 101 initial emergency call while the UE 101 is in the camped on any cell state and all other required information is sent only via the paging PDCCH DCI.

[0054] Depending on the UE's sub-states, such as idle and inactive, two-step paging reception or one-step paging reception can be performed. Two-step paging reception can be performed when UE 101 is in a normal camped state, for example, while one-step paging reception can be performed when UE 101 is camped on any cell. Two-step paging reception is performed by first receiving a paging PDCCH DCI and then receiving a paging PDSCH using allocated radio resources. One-step paging reception is performed by receiving only the paging PDCCH DCI. In one-step reception, only one physical channel is monitored or evaluated. In two-step reception, two physical channels are monitored or evaluated when a communication message is received.

[0055] Similarly, the eNB or gNB 111 may partition the information to be in a paging message and provide it in the PDCCH or DCI of the PDCCH. For example, the paging message may include a UE identifier, while the PDCCH includes an indication of the presence of an early warning message (e.g., ETWS, CMAS, etc.) or a system information change indication. Thus, the eNB or gNB 111 may generate PDCCH DCI based on or for a UE in the camped on any cell state to monitor only the PDCCH and not need to evaluate the paging message. The paging message may still include a UE identifier, but the UE does not examine or process it when in the camped on any cell state and only monitors the PDCCH.

[0056] See also Figure 4 , shows an exemplary process flow 400 illustrating sub-state transitions in the Idle and Inactive states according to TS 38.304 section 5.2.6 version 15 or higher.

[0057] Cells are categorized based on the services they provide: acceptable cells and suitable cells. An "acceptable cell" is a cell on which a UE can camp to obtain limited services (initiating emergency calls and receiving ETWS and CMAS notifications). Such a cell must meet the following requirements, which are the minimum set of requirements for initiating emergency calls and receiving ETWS and CMAS notifications in an NR network: - The cell must not be barred, see subclause 5.3.1 of TS 38.304; - The cell selection criteria must be met, see subclause 5.2.3.2 of TS 38.304.

[0058] A cell is considered "suitable" if the following conditions are met: a) the cell is part of any of the following: - a selected PLMN, or: - a registered PLMN, or - a PLMN in the equivalent PLMN list; b) - the cell selection criteria are met, see subclause 5.2.3.2 of TS 38.304; based on the latest information provided by NAS: - the cell is not barred, see subclause 5.3.1; the cell is part of at least one Tracking Area (TA) but is not part of the list of "prohibited tracking areas" as defined in TS22.261, which list belongs to the PLMNs that meet the first bullet point above.

[0059] If the UE has an ongoing emergency call, then as a result of the substate determination, all acceptable cells of the PLMN are considered suitable for the duration of the emergency call. If the UE is in the normal camp substate 402, the UE 101 receives paging in two steps (i.e., first receiving the paging PDCCH DCI, and then receiving the paging message in the PDSCH via the allocated resources via the PDCCH DCI). The UE 101 in this state 402 can then move from idle / inactive to being in connected mode 404. The cell is a barred cell (if it is so indicated in the system information). The cell is a reserved cell (if it is so indicated in the system information).

[0060] If UE 101 is not in the normal camped state sub-state and the UE is in the camped on any cell state 406, UE 101 receives paging in one step (i.e., only receives the paging PDCCH DCI). If UE 101 is neither in the normal camped state nor in the camped on any cell state, the UE follows the specified behavior defined in 3GPP TS 38.304. It should be noted that in order to achieve one-step paging reception for UEs in the camped on any cell state, the network should ensure that there is no callback for the UE's initial emergency call while the UE is in the camped on any cell state and all other required information is sent only via the paging PDCCH DCI.

[0061] In the event that no suitable cell is found and no acceptable cell is found, the UE state may move to any cell selection 408. If the UE is in camped on any cell 406, it may leave idle when an emergency call is initiated at 410. If the UE 101 loses coverage of the registered PLMN, a new PLMN is either automatically selected (auto mode) or the user is provided with an indication of available PLMNs so that manual selection can be performed (manual mode).

[0062] Table 1 presents the UE non-access stratum (NAS) and UE access stratum in RRC_IDLE state and RRC_INACTIVE state. Functional division between (AS) .

[0063]

[0064]

[0065] The following three levels of service are provided by the network to the UE when it is in RRC_IDLE state: limited service (emergency calls, ETWS and CMAS on acceptable cells); normal service (for public use on suitable cells); and operator service (for operators only on reserved cells).

[0066] The following two levels of service are provided by the network to the UE while it is in the RRC_INACTIVE state: normal service (for public use on suitable cells); and operator service (for operators only on reserved cells).

[0067] Cell selection is performed by one of two processes: initial cell selection (without a priori knowledge of which RF channels are NR carriers); and cell selection by leveraging stored information.

[0068] During the initial cell selection process (without a priori knowledge of which RF channels are NR carriers), the UE scans all RF channels in the NR band based on its ability to find a suitable cell. On each carrier frequency, the UE only needs to search for the strongest cell. Once a suitable cell is found, it is selected.

[0069] Cell selection using stored information requires stored carrier frequency information and, optionally, information about cell parameters from previously received measurement control information elements or from previously detected cells. Once the UE has found a suitable cell, it selects that cell. If no suitable cell is found, the initial cell selection process in a) is started.

[0070] When Srxlev>0 and Squal>0, the cell selection criterion S within the normal coverage range is met, where Srxlev=Q rxlevmeas –(Q rxlevmin +Q rxlevminoffset )–P compensation -Qoffset temp And Squal=Q qualmeas –(Q qualmin +Q qualminoffset )-Qoffset temp .

[0071] in:

[0072]

[0073]

[0074] As a result of periodic searches for higher priority PLMNs when camped normally in a VPLMN, the signaled value Q is only applied when evaluating cells for cell selection. rxlevminoffset and Q qualminoffset During this periodic search for a higher priority PLMN, the UE may check the S criteria of a cell using parameter values stored from different cells of the higher priority PLMN.

[0075] There are two mechanisms that allow operators to impose cell reservations or access restrictions. The first mechanism uses cell status and indications of special reservations to control the cell selection and reselection process. The second mechanism (known as Unified Access Control TS 38.331) allows UEs using selected access categories or access identities to be prevented from sending initial access messages for load control reasons.

[0076] The cell status and cell reservation are indicated in the MasterInformationBlock or SystemInformationBlockType1 (SIB1) message by the following three fields: i) cellBarred (IE type: "Barred" or "Not Barred") indicated in the MasterInformationBlock message (for multiple PLMNs indicated in SIB1, this field is common to all PLMNs); cellReservedForOperatorUse (IE type: "Reserved" or "Not Reserved") (indicated in the SystemInformationBlockType1 message. For multiple PLMNs indicated in SIB1, this field is specified for each PLMN); and cellReservedForOtherUse (IE type: "Reserved" or "Not Reserved") indicated in the SystemInformationBlockType1 message (for multiple PLMNs indicated in SIB1, this field is common to all PLMNs).

[0077] See also Figure 5 , illustrates an exemplary process flow 500 of a network device (e.g., user equipment (UE), new radio NB (gNB), 5GC component / network device, etc.) that can process, generate, or monitor new radio (NR) communications via a 5G network system (5GS) to perform operations for reducing power consumption while camped on any cell.

[0078] At 502, a process flow begins entering an idle mode to achieve reduced power consumption compared to being in idle mode alone or compared to being in a normal resident state.

[0079] At 504, process flow continues with performing either two-step page reception or one-step page reception based on which sub-state of idle mode the process is operating in.

[0080] In other embodiments, the process flow includes performing a two-step paging reception in response to being in a normal camp state and performing a one-step paging reception in response to being in a camp on any cell state. The process flow includes monitoring only the physical downlink control channel (PDCCH) in response to operating in the camp on any cell state of idle mode. This includes processing information on the physical downlink control channel (PDCCH) as a one-step paging reception.

[0081] As used in this specification, the term "processor" may refer to substantially any computational processing unit or device, including but not limited to a single-core processor; a single processor with software multi-threaded execution capability; a multi-core processor; a multi-core processor with software multi-threaded execution capability; a multi-core processor with hardware multi-threading technology; a parallel platform; and a parallel platform with distributed shared memory. In addition, a processor may refer to an integrated circuit, an application-specific integrated circuit, a digital signal processor, a field programmable gate array, a programmable logic controller, a complex programmable logic device, discrete gate or transistor logic, discrete hardware components, or any combination thereof designed to perform the functions and / or processes described herein. The processor may utilize nanoscale architectures, such as, but not limited to, molecular and quantum dot-based transistors, switches, and gates, in order to optimize space usage or enhance the performance of a mobile device. The processor may also be implemented as a combination of computational processing units.

[0082] Embodiments (implementations) may include subject matter such as a method, an apparatus for performing the actions or blocks of the method, and at least one machine-readable medium comprising instructions that, when executed by a machine (e.g., a processor with memory, an application-specific integrated circuit (ASIC), a field-programmable gate array (FPGA), etc.), cause the machine to perform the actions of a method or apparatus or system for concurrent communication using multiple communication technologies according to the embodiments and examples described herein.

[0083] A first embodiment is an apparatus configured to be employed in a user equipment (UE) for new radio (NR) communications. The apparatus includes one or more processors configured to: enter an idle mode to achieve reduced battery power consumption; and in response to operating in a camped-on-any-cell state of the idle mode, monitor only a physical downlink control channel (PDCCH). A radio frequency (RF) interface is configured to provide data for receiving NR communications to the RF circuitry.

[0084] A second embodiment may include the first embodiment, wherein the one or more processors are further configured to enter the idle mode by entering a camp on any cell state in response to selecting a cell regardless of a public land mobile network (PLMN) identity.

[0085] A third embodiment may include the first embodiment or the second embodiment, wherein the one or more processors are further configured to determine whether to perform two-step paging reception or one-step paging reception based on which substate of the idle mode the communication operation is in when power is being supplied.

[0086] A fourth embodiment may include any one of the first to third embodiments, wherein the one or more processors are further configured to: perform two-step paging reception in response to being in a normal camp state, and perform one-step paging reception in response to being in a camped on any cell state.

[0087] The fifth embodiment may include any one of the first to fourth embodiments, wherein the one or more processors are further configured to: perform two-step paging reception by processing a first reception of a paging PDCCH and processing a second reception of a paging physical downlink shared channel (PDSCH) based on the allocated radio resources of the downlink control information (DCI) of the PDCCH.

[0088] The sixth embodiment may include any one of the first to fifth embodiments, wherein the one or more processors are further configured to: perform one-step paging reception only by processing the DCI of the PDCCH when receiving NR communication.

[0089] A seventh embodiment may include any one of the first to sixth embodiments, wherein the one or more processors are further configured to reduce power in paging reception by monitoring the presence of early warning system messages and system information change indications only in the PDCCH.

[0090] An eighth embodiment may include any one of the first to seventh embodiments, wherein the one or more processors are further configured to: in response to being in a normal camp state, determine the UE identifier in the paging message in the PDSCH based on the DCI of the PDCCH.

[0091] A ninth embodiment is a computer-readable storage device storing executable instructions that, in response to execution, cause one or more processors of a user equipment (UE) for New Radio (NR) communications to perform operations. These operations include: entering an idle mode to achieve reduced power consumption; and performing two-step paging reception or one-step paging reception based on which substate of the idle mode the process is operating in.

[0092] The tenth embodiment may include the ninth embodiment, wherein the operations further comprise: performing two-step paging reception in response to being in a normal camped state; and performing one-step paging reception in response to being in a camped on any cell state.

[0093] An eleventh embodiment may include any one of the ninth to tenth embodiments, wherein the operations further comprise: monitoring only a physical downlink control channel (PDCCH) in response to operating in a camp-on-any-cell state of an idle mode.

[0094] A twelfth embodiment may include any one of the ninth to eleventh embodiments, wherein the operations further include: processing information of a physical downlink control channel (PDCCH) as one-step paging reception.

[0095] A thirteenth embodiment may include any one of the ninth to twelfth embodiments, wherein the operations further comprise: processing information of a paging message of a physical downlink shared channel (PDSCH) and information of a PDCCH as part of two-step paging reception.

[0096] The fourteenth embodiment may include any one of the ninth to thirteenth embodiments, wherein the information of the PDCCH includes at least one of the following: an early warning system message or a system information change indication, the early warning system message including an Earthquake and Tsunami Warning System (ETWS) message or a Commercial Mobile Alert System (CMAS) message.

[0097] The fifteenth embodiment may include any one of the ninth to fourteenth embodiments, wherein the operations further include: reducing power while camped in any cell by monitoring early warning system messages and system information change indications only in the PDCCH.

[0098] The sixteenth embodiment may include any one of the ninth to fifteenth embodiments, wherein the operations further include: in response to not finding an acceptable cell, performing one-step paging reception by extracting only one of the following: an early warning system message or a system information change indication from a PDCCH.

[0099] A seventeenth embodiment may include any one of the ninth to sixteenth embodiments, wherein the operations further comprise: extracting one of the following: an early warning system message or a system information change indication from a PDCCH without processing a paging message.

[0100] An eighteenth embodiment is an apparatus configured to be employed in a next-generation Node B (gNB) for new radio (NR) communications, the apparatus comprising: one or more processors configured to: generate a paging message for a UE in a normal camped state; and generate a physical downlink control channel (PDCCH) including information enabling a UE in a camped-on-any-cell state to monitor only the PDCCH. A radio frequency (RF) interface is configured to provide data for transmitting NR communications including one or more of the following: a paging message or a PDCCH to the RF circuit.

[0101] The nineteenth embodiment may include the eighteenth embodiment, wherein the one or more processors are further configured to provide information from the paging message to the PDCCH to enable a UE in a camp-on-any-cell state to monitor only the PDCCH.

[0102] A twentieth embodiment includes any one of the eighteenth to nineteenth embodiments, wherein the one or more processors are further configured to enable the UE to perform one-step paging reception based on the PDCCH in response to being in a camped on any cell state.

[0103] In addition, the various aspects or features described herein can be implemented as methods, devices or products using standard programming and / or engineering techniques. As used herein, the term "product" is intended to cover computer programs that can be accessed from any computer-readable device, carrier or medium. For example, computer-readable media may include, but are not limited to, magnetic storage devices (e.g., hard disks, floppy disks, magnetic strips), optical disks (e.g., compact disks (CDs), digital versatile disks (DVDs), etc.), smart cards, and flash memory devices (e.g., EPROMs, cards, sticks, key drives, etc.). In addition, the various storage media described herein may represent one or more devices and / or other machine-readable media for storing information. The term "machine-readable medium" may include, but is not limited to, wireless channels and various other media capable of storing, containing and / or carrying instructions and / or data. In addition, a computer program product may include a computer-readable medium having one or more instructions or codes that are operable to cause a computer to perform the functions described herein.

[0104] Communication media embodies computer-readable instructions, data structures, program modules, or other structured or unstructured data in a data signal, such as a modulated data signal, such as a carrier wave, or other transport mechanism, and includes any information delivery or transmission media. The term "modulated data signal" or signal refers to a signal that has one or more characteristics set or changed in such a manner as to encode information in one or more signals. By way of example, and not limitation, communication media includes wired media, such as a wired network or direct-wired connection, and wireless media, such as acoustic, RF, infrared, and other wireless media.

[0105] An exemplary storage medium may be coupled to a processor so that the processor can read information from the storage medium and write information to the storage medium. In an alternative, the storage medium may be integrated with the processor. Furthermore, in some aspects, the processor and the storage medium may reside in an ASIC. Additionally, the ASIC may reside in a user terminal. In an alternative, the processor and the storage medium may reside in a user terminal as discrete components. Additionally, in some aspects, the processes and / or actions of the method or algorithm may reside on a machine-readable medium and / or computer-readable medium as one or any combination or set of codes and / or instructions and may be incorporated into a computer program product.

[0106] In this regard, although the subject matter disclosed herein has been described in conjunction with various embodiments and corresponding drawings, it should be understood that other similar embodiments may be used or modifications and additions may be made to the described embodiments to perform the same, similar, alternative, or alternative functions of the disclosed subject matter without departing from the described embodiments. Accordingly, the disclosed subject matter should not be limited to any single embodiment described herein, but rather should be construed in accordance with the breadth and scope of the claims appended hereto.

[0107] In particular, with respect to the various functions performed by the aforementioned components (assemblies, devices, circuits, systems, etc.), unless otherwise indicated, terms used to describe such components (including references to "means") are intended to correspond to any component or structure that performs the specified function of the component (e.g., functionally equivalent), even if not structurally equivalent to the disclosed structure that performs the function in the exemplary embodiments of the present disclosure shown herein. In addition, while particular features have been disclosed with respect to only one of several embodiments, for any given or particular application, such features may be combined with one or more other features of other embodiments, as may be desirable and advantageous.

Claims

1. A baseband processor comprising a memory coupled to one or more processors, the one or more processors being configured to: In response to operating in a camped-on-any-cell state, monitoring a paging physical downlink control channel (PDCCH) for communications; performing one-step paging reception based on operating in the camp-on-anycell state, wherein the one-step paging reception is performed in response to being in the camp-on-anycell state by processing only downlink control information (DCI) of the PDCCH when receiving the communication; and The communication is received in response to the one-step paging reception.

2. The baseband processor of claim 1 , wherein the one or more processors are further configured to: Prior to monitoring the paging PDCCH, in response to selecting a cell regardless of a public land mobile network (PLMN) identity, an idle mode is entered.

3. The baseband processor of claim 2, wherein the one or more processors are further configured to determine whether to perform the one-step paging reception based on a substate of the idle mode. 4 . The baseband processor of claim 1 , wherein the one-step paging is further performed by monitoring the presence of an early warning system message and a system information change indication only in the PDCCH. 5 . The baseband processor of claim 4 , wherein the early warning system message comprises an Earthquake and Tsunami Warning System (ETWS) message or a Commercial Mobile Alert System (CMAS) message.

6. The baseband processor of claim 4, wherein the one or more processors are further configured to: In response to not finding an acceptable cell while monitoring the PDCCH, the one-step paging reception is performed by extracting only one of the early warning system message or the system information change indication. 7 . The baseband processor of claim 1 , wherein the one or more processors are further configured to monitor only the PDCCH in response to operating in the camp-on-any-cell state of idle mode.

8. A user equipment (UE), comprising: Memory; one or more processors coupled to the memory and configured to: In response to operating in a camped-on-any-cell state, monitoring a paging physical downlink control channel (PDCCH) for communications; performing one-step paging reception based on operating in the camped-on-any-cell state, wherein the one-step paging reception is performed in response to being in the camped-on-any-cell state by processing only downlink control information (DCI) of the PDCCH when receiving the communication; as well as The communication is received in response to the one-step paging reception.

9. The UE of claim 8, wherein the one or more processors are further configured to: Prior to monitoring the paging PDCCH, in response to selecting a cell regardless of a public land mobile network (PLMN) identity, an idle mode is entered.

10. The UE of claim 9, wherein the one or more processors are further configured to determine to perform the one-step paging reception based on a substate of the idle mode.

11. The UE according to claim 8, wherein the one-step paging is further performed by monitoring the presence of an early warning system message and a system information change indication only in the PDCCH. 12 . The UE according to claim 11 , wherein the early warning system message comprises an Earthquake and Tsunami Warning System (ETWS) message or a Commercial Mobile Alert System (CMAS) message.

13. The UE of claim 11 , wherein the one or more processors are further configured to: In response to not finding an acceptable cell while monitoring the PDCCH, the one-step paging reception is performed by extracting only one of the early warning system message or the system information change indication.

14. The UE of claim 8, wherein the one or more processors are further configured to monitor only the PDCCH in response to operating in the camp-on-any-cell state of idle mode.

15. A method for user equipment (UE), the method comprising: In response to operating in a camped-on-any-cell state, monitoring a paging physical downlink control channel (PDCCH) for communications; performing one-step paging reception based on operating in the camped-on-any-cell state, wherein the one-step paging reception is performed in response to being in the camped-on-any-cell state by processing only downlink control information (DCI) of the PDCCH when receiving the communication; as well as The communication is received in response to the one-step paging reception.

16. The method according to claim 15, further comprising: Prior to monitoring the paging PDCCH, in response to selecting a cell regardless of a public land mobile network (PLMN) identity, an idle mode is entered.

17. The method according to claim 16, further comprising: The one-step paging reception is performed based on a sub-state of the idle mode.

18. The method of claim 15, wherein the one-step paging is further performed by monitoring the presence of an early warning system message and a system information change indication only in the PDCCH.

19. The method of claim 18, wherein the early warning system message comprises an Earthquake and Tsunami Warning System (ETWS) message or a Commercial Mobile Alert System (CMAS) message.

20. The method of claim 18, further comprising: In response to not finding an acceptable cell while monitoring the PDCCH, the one-step paging reception is performed by extracting only one of the early warning system message or the system information change indication.

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