Method and apparatus for on-demand paging

Abstract

A method and apparatus for on-demand paging is provided. The wireless device determines a paging group of the wireless device. The wireless device receives, from a network, a configuration for a paging request. The wireless device transmits, to the network, a paging request including information related to the paging group of the wireless device. The wireless device monitors a paging occasion.

Description

METHOD AND APPARATUS FOR ON-DEMAND PAGING

[0001] The present disclosure relates to a method and apparatus for on-demand paging.

[0002] 3rd generation partnership project (3GPP) long-term evolution (LTE) is a technology for enabling high-speed packet communications. Many schemes have been proposed for the LTE objective including those that aim to reduce user and provider costs, improve service quality, and expand and improve coverage and system capacity. The 3GPP LTE requires reduced cost per bit, increased service availability, flexible use of a frequency band, a simple structure, an open interface, and adequate power consumption of a terminal as an upper-level requirement.

[0003] Work has started in international telecommunication union (ITU) and 3GPP to develop requirements and specifications for new radio (NR) systems. 3GPP has to identify and develop the technology components needed for successfully standardizing the new RAT timely satisfying both the urgent market needs, and the more long-term requirements set forth by the ITU radio communication sector (ITU-R) international mobile telecommunications (IMT)-2020 process. Further, the NR should be able to use any spectrum band ranging at least up to 100 GHz that may be made available for wireless communications even in a more distant future.

[0004] The NR targets a single technical framework addressing all usage scenarios, requirements and deployment scenarios including enhanced mobile broadband (eMBB), massive machine-type-communications (mMTC), ultra-reliable and low latency communications (URLLC), etc. The NR shall be inherently forward compatible.

[0005] A UE belongs to a single paging group / sub-group. Network does not know whether UEs belonging to a specific paging group / sub-group is camping on or not. Therefore, the gNB broadcasts the Paging information for all paging groups / subgroups when it is received from the core network.

[0006] For example, only UEs which belong to paging group #1 or #2 are camping on a cell. The cell only needs to transmit the Paging information when the paging is generated for UE belonging to the paging group #1 or #2. However, the cell does not know that, and wastes radio resource transmitting the Paging information even for UEs which not belong to the paging group #1 or #2.

[0007] Therefore, studies for on-demand paging are required.

[0008] In an aspect, a method is provided. The method comprises: determining, by a wireless device, a paging group of the wireless device; receiving, by the wireless device from a network, a configuration for a paging request; transmitting, by the wireless device to the network, a paging request including information related to the paging group of the wireless device; and monitoring, by the wireless device, a paging occasion.

[0009] In another aspect, an apparatus for implementing the above method is provided.

[0010] The present disclosure can have various advantageous effects.

[0011] According to some embodiments of the present disclosure, the wireless device could efficiently perform on-demand paging procedure.

[0012] For example, network can save its power and radio resource by not transmitting the paging information for a specific paging group / sub-group which has not requested the paging transmission.

[0013] For example, although the UE power consumption slightly increases due to the requirement to send MSG1 for the paging request, the power saving resulting from the reduction in false alarms received by UE can somewhat compensate for this.

[0014] For example, by performing a paging request per paging group, the wireless device could obtain a higher NES gain than a paging request per wireless device.

[0015] According to some embodiments of the present disclosure, the wireless communication system could provide an efficient solution for on-demand paging.

[0016] Advantageous effects which can be obtained through specific embodiments of the present disclosure are not limited to the advantageous effects listed above. For example, there may be a variety of technical effects that a person having ordinary skill in the related art can understand and / or derive from the present disclosure. Accordingly, the specific effects of the present disclosure are not limited to those explicitly described herein, but may include various effects that may be understood or derived from the technical features of the present disclosure.

[0017] FIG. 1 shows an example of a communication system to which implementations of the present disclosure is applied.

[0018] FIG. 2 shows an example of wireless devices to which implementations of the present disclosure is applied.

[0019] FIG. 3 shows an example of a wireless device to which implementations of the present disclosure is applied.

[0020] FIG. 4 shows another example of wireless devices to which implementations of the present disclosure is applied.

[0021] FIG. 5 shows an example of UE to which implementations of the present disclosure is applied.

[0022] FIGS. 6 and 7 show an example of protocol stacks in a 3GPP based wireless communication system to which implementations of the present disclosure is applied.

[0023] FIG. 8 shows a frame structure in a 3GPP based wireless communication system to which implementations of the present disclosure is applied.

[0024] FIG. 9 shows a data flow example in the 3GPP NR system to which implementations of the present disclosure is applied.

[0025] FIG. 10 shows an example of a method for on-demand paging, according to some embodiments of the present disclosure.

[0026] FIG. 11 shows an example of a method for on-demand paging.

[0027] FIG. 12 shows an example of a method for on-demand paging.

[0028] The following techniques, apparatuses, and systems may be applied to a variety of wireless multiple access systems. Examples of the multiple access systems include a code division multiple access (CDMA) system, a frequency division multiple access (FDMA) system, a time division multiple access (TDMA) system, an orthogonal frequency division multiple access (OFDMA) system, a single carrier frequency division multiple access (SC-FDMA) system, and a multicarrier frequency division multiple access (MC-FDMA) system. CDMA may be embodied through radio technology such as universal terrestrial radio access (UTRA) or CDMA2000. TDMA may be embodied through radio technology such as global system for mobile communications (GSM), general packet radio service (GPRS), or enhanced data rates for GSM evolution (EDGE). OFDMA may be embodied through radio technology such as institute of electrical and electronics engineers (IEEE) 802.11 (Wi-Fi), IEEE 802.16 (WiMAX), IEEE 802.20, or evolved UTRA (E-UTRA). UTRA is a part of a universal mobile telecommunications system (UMTS). 3rd generation partnership project (3GPP) long term evolution (LTE) is a part of evolved UMTS (E-UMTS) using E-UTRA. 3GPP LTE employs OFDMA in DL and SC-FDMA in UL. LTE-advanced (LTE-A) is an evolved version of 3GPP LTE.

[0029] For convenience of description, implementations of the present disclosure are mainly described in regards to a 3GPP based wireless communication system. However, the technical features of the present disclosure are not limited thereto. For example, although the following detailed description is given based on a mobile communication system corresponding to a 3GPP based wireless communication system, aspects of the present disclosure that are not limited to 3GPP based wireless communication system are applicable to other mobile communication systems.

[0030] For terms and technologies which are not specifically described among the terms of and technologies employed in the present disclosure, the wireless communication standard documents published before the present disclosure may be referenced.

[0031] In the present disclosure, "A or B" may mean "only A", "only B", or "both A and B". In other words, "A or B" in the present disclosure may be interpreted as "A and / or B". For example, "A, B or C" in the present disclosure may mean "only A", "only B", "only C", or "any combination of A, B and C".

[0032] In the present disclosure, slash ( / ) or comma (,) may mean "and / or". For example, "A / B" may mean "A and / or B". Accordingly, "A / B" may mean "only A", "only B", or "both A and B". For example, "A, B, C" may mean "A, B or C".

[0033] In the present disclosure, "at least one of A and B" may mean "only A", "only B" or "both A and B". In addition, the expression "at least one of A or B" or "at least one of A and / or B" in the present disclosure may be interpreted as same as "at least one of A and B".

[0034] In addition, in the present disclosure, "at least one of A, B and C" may mean "only A", "only B", "only C", or "any combination of A, B and C". In addition, "at least one of A, B or C" or "at least one of A, B and / or C" may mean "at least one of A, B and C".

[0035] Also, parentheses used in the present disclosure may mean "for example". In detail, when it is shown as "control information (PDCCH)", "PDCCH" may be proposed as an example of "control information". In other words, "control information" in the present disclosure is not limited to "PDCCH", and "PDCCH" may be proposed as an example of "control information". In addition, even when shown as "control information (i.e., PDCCH)", "PDCCH" may be proposed as an example of "control information".

[0036] Technical features that are separately described in one drawing in the present disclosure may be implemented separately or simultaneously.

[0037] Although not limited thereto, various descriptions, functions, procedures, suggestions, methods and / or operational flowcharts of the present disclosure disclosed herein can be applied to various fields requiring wireless communication and / or connection (e.g., 5G) between devices.

[0038] Hereinafter, the present disclosure will be described in more detail with reference to drawings. The same reference numerals in the following drawings and / or descriptions may refer to the same and / or corresponding hardware blocks, software blocks, and / or functional blocks unless otherwise indicated.

[0039] FIG. 1 shows an example of a communication system to which implementations of the present disclosure is applied.

[0040] The 5G usage scenarios shown in FIG. 1 are only exemplary, and the technical features of the present disclosure can be applied to other 5G usage scenarios which are not shown in FIG. 1.

[0041] Three main requirement categories for 5G include (1) a category of enhanced mobile broadband (eMBB), (2) a category of massive machine type communication (mMTC), and (3) a category of ultra-reliable and low latency communications (URLLC).

[0042] Partial use cases may require a plurality of categories for optimization and other use cases may focus only upon one key performance indicator (KPI). 5G supports such various use cases using a flexible and reliable method.

[0043] eMBB far surpasses basic mobile Internet access and covers abundant bidirectional work and media and entertainment applications in cloud and augmented reality. Data is one of 5G core motive forces and, in a 5G era, a dedicated voice service may not be provided for the first time. In 5G, it is expected that voice will be simply processed as an application program using data connection provided by a communication system. Main causes for increased traffic volume are due to an increase in the size of content and an increase in the number of applications requiring high data transmission rate. A streaming service (of audio and video), conversational video, and mobile Internet access will be more widely used as more devices are connected to the Internet. These many application programs require connectivity of an always turned-on state in order to push real-time information and alarm for users. Cloud storage and applications are rapidly increasing in a mobile communication platform and may be applied to both work and entertainment. The cloud storage is a special use case which accelerates growth of uplink data transmission rate. 5G is also used for remote work of cloud. When a tactile interface is used, 5G demands much lower end-to-end latency to maintain user good experience. Entertainment, for example, cloud gaming and video streaming, is another core element which increases demand for mobile broadband capability. Entertainment is essential for a smartphone and a tablet in any place including high mobility environments such as a train, a vehicle, and an airplane. Other use cases are augmented reality for entertainment and information search. In this case, the augmented reality requires very low latency and instantaneous data volume.

[0044] In addition, one of the most expected 5G use cases relates a function capable of smoothly connecting embedded sensors in all fields, i.e., mMTC. It is expected that the number of potential Internet-of-things (IoT) devices will reach 204 hundred million up to the year of 2020. An industrial IoT is one of categories of performing a main role enabling a smart city, asset tracking, smart utility, agriculture, and security infrastructure through 5G.

[0045] URLLC includes a new service that will change industry through remote control of main infrastructure and an ultra-reliable / available low-latency link such as a self-driving vehicle. A level of reliability and latency is essential to control a smart grid, automatize industry, achieve robotics, and control and adjust a drone.

[0046] 5G is a means of providing streaming evaluated as a few hundred megabits per second to gigabits per second and may complement fibre-to-the-home (FTTH) and cable-based broadband (or DOCSIS). Such fast speed is needed to deliver TV in resolution of 4K or more (6K, 8K, and more), as well as virtual reality and augmented reality. Virtual reality (VR) and augmented reality (AR) applications include almost immersive sports games. A specific application program may require a special network configuration. For example, for VR games, gaming companies need to incorporate a core server into an edge network server of a network operator in order to minimize latency.

[0047] Automotive is expected to be a new important motivated force in 5G together with many use cases for mobile communication for vehicles. For example, entertainment for passengers requires high simultaneous capacity and mobile broadband with high mobility. This is because future users continue to expect connection of high quality regardless of their locations and speeds. Another use case of an automotive field is an AR dashboard. The AR dashboard causes a driver to identify an object in the dark in addition to an object seen from a front window and displays a distance from the object and a movement of the object by overlapping information talking to the driver. In the future, a wireless module enables communication between vehicles, information exchange between a vehicle and supporting infrastructure, and information exchange between a vehicle and other connected devices (e.g., devices accompanied by a pedestrian). A safety system guides alternative courses of a behaviour so that a driver may drive more safely drive, thereby lowering the danger of an accident. The next stage will be a remotely controlled or self-driven vehicle. This requires very high reliability and very fast communication between different self-driven vehicles and between a vehicle and infrastructure. In the future, a self-driven vehicle will perform all driving activities and a driver will focus only upon abnormal traffic that the vehicle cannot identify. Technical requirements of a self-driven vehicle demand ultra-low latency and ultra-high reliability so that traffic safety is increased to a level that cannot be achieved by human being.

[0048] A smart city and a smart home / building mentioned as a smart society will be embedded in a high-density wireless sensor network. A distributed network of an intelligent sensor will identify conditions for costs and energy-efficient maintenance of a city or a home. Similar configurations may be performed for respective households. All of temperature sensors, window and heating controllers, burglar alarms, and home appliances are wirelessly connected. Many of these sensors are typically low in data transmission rate, power, and cost. However, real-time HD video may be demanded by a specific type of device to perform monitoring.

[0049] Consumption and distribution of energy including heat or gas is distributed at a higher level so that automated control of the distribution sensor network is demanded. The smart grid collects information and connects the sensors to each other using digital information and communication technology so as to act according to the collected information. Since this information may include behaviours of a supply company and a consumer, the smart grid may improve distribution of fuels such as electricity by a method having efficiency, reliability, economic feasibility, production sustainability, and automation. The smart grid may also be regarded as another sensor network having low latency.

[0050] Mission critical application (e.g., e-health) is one of 5G use scenarios. A health part contains many application programs capable of enjoying benefit of mobile communication. A communication system may support remote treatment that provides clinical treatment in a faraway place. Remote treatment may aid in reducing a barrier against distance and improve access to medical services that cannot be continuously available in a faraway rural area. Remote treatment is also used to perform important treatment and save lives in an emergency situation. The wireless sensor network based on mobile communication may provide remote monitoring and sensors for parameters such as heart rate and blood pressure.

[0051] Wireless and mobile communication gradually becomes important in the field of an industrial application. Wiring is high in installation and maintenance cost. Therefore, a possibility of replacing a cable with constructible wireless links is an attractive opportunity in many industrial fields. However, in order to achieve this replacement, it is necessary for wireless connection to be established with latency, reliability, and capacity similar to those of the cable and management of wireless connection needs to be simplified. Low latency and a very low error probability are new requirements when connection to 5G is needed.

[0052] Logistics and freight tracking are important use cases for mobile communication that enables inventory and package tracking anywhere using a location-based information system. The use cases of logistics and freight typically demand low data rate but require location information with a wide range and reliability.

[0053] Referring to FIG. 1, the communication system 1 includes wireless devices 100a to 100f, base stations (BSs) 200, and a network 300. Although FIG. 1 illustrates a 5G network as an example of the network of the communication system 1, the implementations of the present disclosure are not limited to the 5G system, and can be applied to the future communication system beyond the 5G system.

[0054] The BSs 200 and the network 300 may be implemented as wireless devices and a specific wireless device may operate as a BS / network node with respect to other wireless devices.

[0055] The wireless devices 100a to 100f represent devices performing communication using radio access technology (RAT) (e.g., 5G new RAT (NR)) or LTE) and may be referred to as communication / radio / 5G devices. The wireless devices 100a to 100f may include, without being limited to, a robot 100a, vehicles 100b-1 and 100b-2, an extended reality (XR) device 100c, a hand-held device 100d, a home appliance 100e, an IoT device 100f, and an artificial intelligence (AI) device / server 400. For example, the vehicles may include a vehicle having a wireless communication function, an autonomous driving vehicle, and a vehicle capable of performing communication between vehicles. The vehicles may include an unmanned aerial vehicle (UAV) (e.g., a drone). The XR device may include an AR / VR / Mixed Reality (MR) device and may be implemented in the form of a head-mounted device (HMD), a head-up display (HUD) mounted in a vehicle, a television, a smartphone, a computer, a wearable device, a home appliance device, a digital signage, a vehicle, a robot, etc. The hand-held device may include a smartphone, a smart pad, a wearable device (e.g., a smartwatch or a smart glasses), and a computer (e.g., a notebook). The home appliance may include a TV, a refrigerator, and a washing machine. The IoT device may include a sensor and a smart meter.

[0056] In the present disclosure, the wireless devices 100a to 100f may be called user equipment's (UEs). A UE may include, for example, a cellular phone, a smartphone, a laptop computer, a digital broadcast terminal, a personal digital assistant (PDA), a portable multimedia player (PMP), a navigation system, a slate personal computer (PC), a tablet PC, an ultrabook, a vehicle, a vehicle having an autonomous traveling function, a connected car, an UAV, an AI module, a robot, an AR device, a VR device, an MR device, a hologram device, a public safety device, an MTC device, an IoT device, a medical device, a FinTech device (or a financial device), a security device, a weather / environment device, a device related to a 5G service, or a device related to a fourth industrial revolution field.

[0057] The UAV may be, for example, an aircraft availed by a wireless control signal without a human being onboard.

[0058] The VR device may include, for example, a device for implementing an object or a background of the virtual world. The AR device may include, for example, a device implemented by connecting an object or a background of the virtual world to an object or a background of the real world. The MR device may include, for example, a device implemented by merging an object or a background of the virtual world into an object or a background of the real world. The hologram device may include, for example, a device for implementing a stereoscopic image of 360 degrees by recording and reproducing stereoscopic information, using an interference phenomenon of light generated when two laser lights called holography meet.

[0059] The public safety device may include, for example, an image relay device or an image device that is wearable on the body of a user.

[0060] The MTC device and the IoT device may be, for example, devices that do not require direct human intervention or manipulation. For example, the MTC device and the IoT device may include smart meters, vending machines, thermometers, smart bulbs, door locks, or various sensors.

[0061] The medical device may be, for example, a device used for the purpose of diagnosing, treating, relieving, curing, or preventing disease. For example, the medical device may be a device used for the purpose of diagnosing, treating, relieving, or correcting injury or impairment. For example, the medical device may be a device used for the purpose of inspecting, replacing, or modifying a structure or a function. For example, the medical device may be a device used for the purpose of adjusting pregnancy. For example, the medical device may include a device for treatment, a device for operation, a device for (in vitro) diagnosis, a hearing aid, or a device for procedure.

[0062] The security device may be, for example, a device installed to prevent a danger that may arise and to maintain safety. For example, the security device may be a camera, a closed-circuit TV (CCTV), a recorder, or a black box.

[0063] The FinTech device may be, for example, a device capable of providing a financial service such as mobile payment. For example, the FinTech device may include a payment device or a point of sales (POS) system.

[0064] The weather / environment device may include, for example, a device for monitoring or predicting a weather / environment.

[0065] The wireless devices 100a to 100f may be connected to the network 300 via the BSs 200. An AI technology may be applied to the wireless devices 100a to 100f and the wireless devices 100a to 100f may be connected to the AI server 400 via the network 300. The network 300 may be configured using a 3G network, a 4G (e.g., LTE) network, a 5G (e.g., NR) network, and a beyond-5G network. Although the wireless devices 100a to 100f may communicate with each other through the BSs 200 / network 300, the wireless devices 100a to 100f may perform direct communication (e.g., sidelink communication) with each other without passing through the BSs 200 / network 300. For example, the vehicles 100b-1 and 100b-2 may perform direct communication (e.g., vehicle-to-vehicle (V2V) / vehicle-to-everything (V2X) communication). The IoT device (e.g., a sensor) may perform direct communication with other IoT devices (e.g., sensors) or other wireless devices 100a to 100f.

[0066] Wireless communication / connections 150a, 150b and 150c may be established between the wireless devices 100a to 100f and / or between wireless device 100a to 100f and BS 200 and / or between BSs 200. Herein, the wireless communication / connections may be established through various RATs (e.g., 5G NR) such as uplink / downlink communication 150a, sidelink communication (or device-to-device (D2D) communication) 150b, inter-base station communication 150c (e.g., relay, integrated access and backhaul (IAB)), etc. The wireless devices 100a to 100f and the BSs 200 / the wireless devices 100a to 100f may transmit / receive radio signals to / from each other through the wireless communication / connections 150a, 150b and 150c. For example, the wireless communication / connections 150a, 150b and 150c may transmit / receive signals through various physical channels. To this end, at least a part of various configuration information configuring processes, various signal processing processes (e.g., channel encoding / decoding, modulation / demodulation, and resource mapping / de-mapping), and resource allocating processes, for transmitting / receiving radio signals, may be performed based on the various proposals of the present disclosure.

[0067] Here, the radio communication technologies implemented in the wireless devices in the present disclosure may include narrowband internet-of-things (NB-IoT) technology for low-power communication as well as LTE, NR and 6G. For example, NB-IoT technology may be an example of low power wide area network (LPWAN) technology, may be implemented in specifications such as LTE Cat NB1 and / or LTE Cat NB2, and may not be limited to the above-mentioned names. Additionally and / or alternatively, the radio communication technologies implemented in the wireless devices in the present disclosure may communicate based on LTE-M technology. For example, LTE-M technology may be an example of LPWAN technology and be called by various names such as enhanced machine type communication (mMTC). For example, LTE-M technology may be implemented in at least one of the various specifications, such as 1) LTE Cat 0, 2) LTE Cat M1, 3) LTE Cat M2, 4) LTE non-bandwidth limited (non-BL), 5) LTE-MTC, 6) LTE Machine Type Communication, and / or 7) LTE M, and may not be limited to the above-mentioned names. Additionally and / or alternatively, the radio communication technologies implemented in the wireless devices in the present disclosure may include at least one of ZigBee, Bluetooth, and / or LPWAN which take into account low-power communication, and may not be limited to the above-mentioned names. For example, ZigBee technology may generate personal area networks (PANs) associated with small / low-power digital communication based on various specifications such as IEEE 802.15.4 and may be called various names.

[0068] FIG. 2 shows an example of wireless devices to which implementations of the present disclosure is applied.

[0069] Referring to FIG. 2, a first wireless device 100 and a second wireless device 200 may transmit / receive radio signals to / from an external device through a variety of RATs (e.g., LTE and NR). In FIG. 2, {the first wireless device 100 and the second wireless device 200} may correspond to at least one of {the wireless device 100a to 100f and the BS 200}, {the wireless device 100a to 100f and the wireless device 100a to 100f} and / or {the BS 200 and the BS 200} of FIG. 1.

[0070] The first wireless device 100 may include one or more processors 102 and one or more memories 104 and additionally further include one or more transceivers 106 and / or one or more antennas 108. The processor(s) 102 may control the memory(s) 104 and / or the transceiver(s) 106 and may be configured to implement the descriptions, functions, procedures, suggestions, methods and / or operational flowcharts described in the present disclosure. For example, the processor(s) 102 may process information within the memory(s) 104 to generate first information / signals and then transmit radio signals including the first information / signals through the transceiver(s) 106. The processor(s) 102 may receive radio signals including second information / signals through the transceiver(s) 106 and then store information obtained by processing the second information / signals in the memory(s) 104. The memory(s) 104 may be connected to the processor(s) 102 and may store a variety of information related to operations of the processor(s) 102. For example, the memory(s) 104 may store software code including commands for performing a part or the entirety of processes controlled by the processor(s) 102 or for performing the descriptions, functions, procedures, suggestions, methods and / or operational flowcharts described in the present disclosure. Herein, the processor(s) 102 and the memory(s) 104 may be a part of a communication modem / circuit / chip designed to implement RAT (e.g., LTE or NR). The transceiver(s) 106 may be connected to the processor(s) 102 and transmit and / or receive radio signals through one or more antennas 108. Each of the transceiver(s) 106 may include a transmitter and / or a receiver. The transceiver(s) 106 may be interchangeably used with radio frequency (RF) unit(s). In the present disclosure, the first wireless device 100 may represent a communication modem / circuit / chip.

[0071] The second wireless device 200 may include one or more processors 202 and one or more memories 204 and additionally further include one or more transceivers 206 and / or one or more antennas 208. The processor(s) 202 may control the memory(s) 204 and / or the transceiver(s) 206 and may be configured to implement the descriptions, functions, procedures, suggestions, methods and / or operational flowcharts described in the present disclosure. For example, the processor(s) 202 may process information within the memory(s) 204 to generate third information / signals and then transmit radio signals including the third information / signals through the transceiver(s) 206. The processor(s) 202 may receive radio signals including fourth information / signals through the transceiver(s) 106 and then store information obtained by processing the fourth information / signals in the memory(s) 204. The memory(s) 204 may be connected to the processor(s) 202 and may store a variety of information related to operations of the processor(s) 202. For example, the memory(s) 204 may store software code including commands for performing a part or the entirety of processes controlled by the processor(s) 202 or for performing the descriptions, functions, procedures, suggestions, methods and / or operational flowcharts described in the present disclosure. Herein, the processor(s) 202 and the memory(s) 204 may be a part of a communication modem / circuit / chip designed to implement RAT (e.g., LTE or NR). The transceiver(s) 206 may be connected to the processor(s) 202 and transmit and / or receive radio signals through one or more antennas 208. Each of the transceiver(s) 206 may include a transmitter and / or a receiver. The transceiver(s) 206 may be interchangeably used with RF unit(s). In the present disclosure, the second wireless device 200 may represent a communication modem / circuit / chip.

[0072] Hereinafter, hardware elements of the wireless devices 100 and 200 will be described more specifically. One or more protocol layers may be implemented by, without being limited to, one or more processors 102 and 202. For example, the one or more processors 102 and 202 may implement one or more layers (e.g., functional layers such as physical (PHY) layer, media access control (MAC) layer, radio link control (RLC) layer, packet data convergence protocol (PDCP) layer, radio resource control (RRC) layer, and service data adaptation protocol (SDAP) layer). The one or more processors 102 and 202 may generate one or more protocol data units (PDUs) and / or one or more service data unit (SDUs) according to the descriptions, functions, procedures, suggestions, methods and / or operational flowcharts disclosed in the present disclosure. The one or more processors 102 and 202 may generate messages, control information, data, or information according to the descriptions, functions, procedures, suggestions, methods and / or operational flowcharts disclosed in the present disclosure. The one or more processors 102 and 202 may generate signals (e.g., baseband signals) including PDUs, SDUs, messages, control information, data, or information according to the descriptions, functions, procedures, suggestions, methods and / or operational flowcharts disclosed in the present disclosure and provide the generated signals to the one or more transceivers 106 and 206. The one or more processors 102 and 202 may receive the signals (e.g., baseband signals) from the one or more transceivers 106 and 206 and acquire the PDUs, SDUs, messages, control information, data, or information according to the descriptions, functions, procedures, suggestions, methods and / or operational flowcharts disclosed in the present disclosure.

[0073] The one or more processors 102 and 202 may be referred to as controllers, microcontrollers, microprocessors, or microcomputers. The one or more processors 102 and 202 may be implemented by hardware, firmware, software, or a combination thereof. As an example, one or more application specific integrated circuits (ASICs), one or more digital signal processors (DSPs), one or more digital signal processing devices (DSPDs), one or more programmable logic devices (PLDs), or one or more field programmable gate arrays (FPGAs) may be included in the one or more processors 102 and 202. descriptions, functions, procedures, suggestions, methods and / or operational flowcharts disclosed in the present disclosure may be implemented using firmware or software and the firmware or software may be configured to include the modules, procedures, or functions. Firmware or software configured to perform the descriptions, functions, procedures, suggestions, methods and / or operational flowcharts disclosed in the present disclosure may be included in the one or more processors 102 and 202 or stored in the one or more memories 104 and 204 so as to be driven by the one or more processors 102 and 202. The descriptions, functions, procedures, suggestions, methods and / or operational flowcharts disclosed in the present disclosure may be implemented using firmware or software in the form of code, commands, and / or a set of commands.

[0074] The one or more memories 104 and 204 may be connected to the one or more processors 102 and 202 and store various types of data, signals, messages, information, programs, code, instructions, and / or commands. The one or more memories 104 and 204 may be configured by read-only memories (ROMs), random access memories (RAMs), electrically erasable programmable read-only memories (EPROMs), flash memories, hard drives, registers, cash memories, computer-readable storage media, and / or combinations thereof. The one or more memories 104 and 204 may be located at the interior and / or exterior of the one or more processors 102 and 202. The one or more memories 104 and 204 may be connected to the one or more processors 102 and 202 through various technologies such as wired or wireless connection.

[0075] The one or more transceivers 106 and 206 may transmit user data, control information, and / or radio signals / channels, mentioned in the descriptions, functions, procedures, suggestions, methods and / or operational flowcharts disclosed in the present disclosure, to one or more other devices. The one or more transceivers 106 and 206 may receive user data, control information, and / or radio signals / channels, mentioned in the descriptions, functions, procedures, suggestions, methods and / or operational flowcharts disclosed in the present disclosure, from one or more other devices. For example, the one or more transceivers 106 and 206 may be connected to the one or more processors 102 and 202 and transmit and receive radio signals. For example, the one or more processors 102 and 202 may perform control so that the one or more transceivers 106 and 206 may transmit user data, control information, or radio signals to one or more other devices. The one or more processors 102 and 202 may perform control so that the one or more transceivers 106 and 206 may receive user data, control information, or radio signals from one or more other devices.

[0076] The one or more transceivers 106 and 206 may be connected to the one or more antennas 108 and 208 and the one or more transceivers 106 and 206 may be configured to transmit and receive user data, control information, and / or radio signals / channels, mentioned in the descriptions, functions, procedures, suggestions, methods and / or operational flowcharts disclosed in the present disclosure, through the one or more antennas 108 and 208. In the present disclosure, the one or more antennas may be a plurality of physical antennas or a plurality of logical antennas (e.g., antenna ports).

[0077] The one or more transceivers 106 and 206 may convert received radio signals / channels, etc., from RF band signals into baseband signals in order to process received user data, control information, radio signals / channels, etc., using the one or more processors 102 and 202. The one or more transceivers 106 and 206 may convert the user data, control information, radio signals / channels, etc., processed using the one or more processors 102 and 202 from the base band signals into the RF band signals. To this end, the one or more transceivers 106 and 206 may include (analog) oscillators and / or filters. For example, the transceivers 106 and 206 can up-convert OFDM baseband signals to a carrier frequency by their (analogy) oscillators and / or filters under the control of the processors 102 and 202 and transmit the up-converted OFDM signals at the carrier frequency. The transceivers 106 and 206 may receive OFDM signals at a carrier frequency and down-convert the OFDM signals into OFDM baseband signals by their (analogy) oscillators and / or filters under the control of the transceivers 102 and 202.

[0078] In the implementations of the present disclosure, a UE may operate as a transmitting device in uplink (UL) and as a receiving device in downlink (DL). In the implementations of the present disclosure, a BS may operate as a receiving device in UL and as a transmitting device in DL. Hereinafter, for convenience of description, it is mainly assumed that the first wireless device 100 acts as the UE, and the second wireless device 200 acts as the BS. For example, the processor(s) 102 connected to, mounted on or launched in the first wireless device 100 may be configured to perform the UE behaviour according to an implementation of the present disclosure or control the transceiver(s) 106 to perform the UE behaviour according to an implementation of the present disclosure. The processor(s) 202 connected to, mounted on or launched in the second wireless device 200 may be configured to perform the BS behaviour according to an implementation of the present disclosure or control the transceiver(s) 206 to perform the BS behaviour according to an implementation of the present disclosure.

[0079] In the present disclosure, a BS is also referred to as a node B (NB), an eNodeB B (eNB), or a gNB.

[0080] FIG. 3 shows an example of a wireless device to which implementations of the present disclosure is applied.

[0081] The wireless device may be implemented in various forms according to a use-case / service (refer to FIG. 1).

[0082] Referring to FIG. 3, wireless devices 100 and 200 may correspond to the wireless devices 100 and 200 of FIG. 2 and may be configured by various elements, components, units / portions, and / or modules. For example, each of the wireless devices 100 and 200 may include a communication unit 110, a control unit 120, a memory unit 130, and additional components 140. The communication unit 110 may include a communication circuit 112 and transceiver(s) 114. For example, the communication circuit 112 may include the one or more processors 102 and 202 of FIG. 2 and / or the one or more memories 104 and 204 of FIG. 2. For example, the transceiver(s) 114 may include the one or more transceivers 106 and 206 of FIG. 2 and / or the one or more antennas 108 and 208 of FIG. 2. The control unit 120 is electrically connected to the communication unit 110, the memory 130, and the additional components 140 and controls overall operation of each of the wireless devices 100 and 200. For example, the control unit 120 may control an electric / mechanical operation of each of the wireless devices 100 and 200 based on programs / code / commands / information stored in the memory unit 130. The control unit 120 may transmit the information stored in the memory unit 130 to the exterior (e.g., other communication devices) via the communication unit 110 through a wireless / wired interface or store, in the memory unit 130, information received through the wireless / wired interface from the exterior (e.g., other communication devices) via the communication unit 110.

[0083] The additional components 140 may be variously configured according to types of the wireless devices 100 and 200. For example, the additional components 140 may include at least one of a power unit / battery, input / output (I / O) unit (e.g., audio I / O port, video I / O port), a driving unit, and a computing unit. The wireless devices 100 and 200 may be implemented in the form of, without being limited to, the robot (100a of FIG. 1), the vehicles (100b-1 and 100b-2 of FIG. 1), the XR device (100c of FIG. 1), the hand-held device (100d of FIG. 1), the home appliance (100e of FIG. 1), the IoT device (100f of FIG. 1), a digital broadcast terminal, a hologram device, a public safety device, an MTC device, a medicine device, a FinTech device (or a finance device), a security device, a climate / environment device, the AI server / device (400 of FIG. 1), the BSs (200 of FIG. 1), a network node, etc. The wireless devices 100 and 200 may be used in a mobile or fixed place according to a use-example / service.

[0084] In FIG. 3, the entirety of the various elements, components, units / portions, and / or modules in the wireless devices 100 and 200 may be connected to each other through a wired interface or at least a part thereof may be wirelessly connected through the communication unit 110. For example, in each of the wireless devices 100 and 200, the control unit 120 and the communication unit 110 may be connected by wire and the control unit 120 and first units (e.g., 130 and 140) may be wirelessly connected through the communication unit 110. Each element, component, unit / portion, and / or module within the wireless devices 100 and 200 may further include one or more elements. For example, the control unit 120 may be configured by a set of one or more processors. As an example, the control unit 120 may be configured by a set of a communication control processor, an application processor (AP), an electronic control unit (ECU), a graphical processing unit, and a memory control processor. As another example, the memory 130 may be configured by a RAM, a DRAM, a ROM, a flash memory, a volatile memory, a non-volatile memory, and / or a combination thereof.

[0085] FIG. 4 shows another example of wireless devices to which implementations of the present disclosure is applied.

[0086] Referring to FIG. 4, wireless devices 100 and 200 may correspond to the wireless devices 100 and 200 of FIG. 2 and may be configured by various elements, components, units / portions, and / or modules.

[0087] The first wireless device 100 may include at least one transceiver, such as a transceiver 106, and at least one processing chip, such as a processing chip 101. The processing chip 101 may include at least one processor, such a processor 102, and at least one memory, such as a memory 104. The memory 104 may be operably connectable to the processor 102. The memory 104 may store various types of information and / or instructions. The memory 104 may store a software code 105 which implements instructions that, when executed by the processor 102, perform the descriptions, functions, procedures, suggestions, methods and / or operational flowcharts disclosed in the present disclosure. For example, the software code 105 may implement instructions that, when executed by the processor 102, perform the descriptions, functions, procedures, suggestions, methods and / or operational flowcharts disclosed in the present disclosure. For example, the software code 105 may control the processor 102 to perform one or more protocols. For example, the software code 105 may control the processor 102 may perform one or more layers of the radio interface protocol.

[0088] The second wireless device 200 may include at least one transceiver, such as a transceiver 206, and at least one processing chip, such as a processing chip 201. The processing chip 201 may include at least one processor, such a processor 202, and at least one memory, such as a memory 204. The memory 204 may be operably connectable to the processor 202. The memory 204 may store various types of information and / or instructions. The memory 204 may store a software code 205 which implements instructions that, when executed by the processor 202, perform the descriptions, functions, procedures, suggestions, methods and / or operational flowcharts disclosed in the present disclosure. For example, the software code 205 may implement instructions that, when executed by the processor 202, perform the descriptions, functions, procedures, suggestions, methods and / or operational flowcharts disclosed in the present disclosure. For example, the software code 205 may control the processor 202 to perform one or more protocols. For example, the software code 205 may control the processor 202 may perform one or more layers of the radio interface protocol.

[0089] FIG. 5 shows an example of UE to which implementations of the present disclosure is applied.

[0090] Referring to FIG. 5, a UE 100 may correspond to the first wireless device 100 of FIG. 2 and / or the first wireless device 100 of FIG. 4.

[0091] A UE 100 includes a processor 102, a memory 104, a transceiver 106, one or more antennas 108, a power management module 110, a battery 1112, a display 114, a keypad 116, a subscriber identification module (SIM) card 118, a speaker 120, and a microphone 122.

[0092] The processor 102 may be configured to implement the descriptions, functions, procedures, suggestions, methods and / or operational flowcharts disclosed in the present disclosure. The processor 102 may be configured to control one or more other components of the UE 100 to implement the descriptions, functions, procedures, suggestions, methods and / or operational flowcharts disclosed in the present disclosure. Layers of the radio interface protocol may be implemented in the processor 102. The processor 102 may include ASIC, other chipset, logic circuit and / or data processing device. The processor 102 may be an application processor. The processor 102 may include at least one of a digital signal processor (DSP), a central processing unit (CPU), a graphics processing unit (GPU), a modem (modulator and demodulator). An example of the processor 102 may be found in SNAPDRAGONTMseries of processors made by Qualcomm®, EXYNOSTMseries of processors made by Samsung®, A series of processors made by Apple®, HELIOTMseries of processors made by MediaTek®, ATOMTMseries of processors made by Intel®or a corresponding next generation processor.

[0093] The memory 104 is operatively coupled with the processor 102 and stores a variety of information to operate the processor 102. The memory 104 may include ROM, RAM, flash memory, memory card, storage medium and / or other storage device. When the embodiments are implemented in software, the techniques described herein can be implemented with modules (e.g., procedures, functions, etc.) that perform the descriptions, functions, procedures, suggestions, methods and / or operational flowcharts disclosed in the present disclosure. The modules can be stored in the memory 104 and executed by the processor 102. The memory 104 can be implemented within the processor 102 or external to the processor 102 in which case those can be communicatively coupled to the processor 102 via various means as is known in the art.

[0094] The transceiver 106 is operatively coupled with the processor 102, and transmits and / or receives a radio signal. The transceiver 106 includes a transmitter and a receiver. The transceiver 106 may include baseband circuitry to process radio frequency signals. The transceiver 106 controls the one or more antennas 108 to transmit and / or receive a radio signal.

[0095] The power management module 110 manages power for the processor 102 and / or the transceiver 106. The battery 112 supplies power to the power management module 110.

[0096] The display 114 outputs results processed by the processor 102. The keypad 116 receives inputs to be used by the processor 102. The keypad 16 may be shown on the display 114.

[0097] The SIM card 118 is an　integrated circuit　that is intended to　securely store the　international mobile subscriber identity　(IMSI) number and its related　key, which are used to identify and authenticate subscribers on　mobile telephony　devices (such as　mobile phones　and　computers). It is also possible to store contact information on many SIM cards.

[0098] The speaker 120 outputs sound-related results processed by the processor 102. The microphone 122 receives sound-related inputs to be used by the processor 102.

[0099] FIGS. 6 and 7 show an example of protocol stacks in a 3GPP based wireless communication system to which implementations of the present disclosure is applied.

[0100] In particular, FIG. 6 illustrates an example of a radio interface user plane protocol stack between a UE and a BS and FIG. 7 illustrates an example of a radio interface control plane protocol stack between a UE and a BS. The control plane refers to a path through which control messages used to manage call by a UE and a network are transported. The user plane refers to a path through which data generated in an application layer, for example, voice data or Internet packet data are transported. Referring to FIG. 6, the user plane protocol stack may be divided into Layer 1 (i.e., a PHY layer) and Layer 2. Referring to FIG. 7, the control plane protocol stack may be divided into Layer 1 (i.e., a PHY layer), Layer 2, Layer 3 (e.g., an RRC layer), and a non-access stratum (NAS) layer. Layer 1, Layer 2 and Layer 3 are referred to as an access stratum (AS).

[0101] In the 3GPP LTE system, the Layer 2 is split into the following sublayers: MAC, RLC, and PDCP. In the 3GPP NR system, the Layer 2 is split into the following sublayers: MAC, RLC, PDCP and SDAP. The PHY layer offers to the MAC sublayer transport channels, the MAC sublayer offers to the RLC sublayer logical channels, the RLC sublayer offers to the PDCP sublayer RLC channels, the PDCP sublayer offers to the SDAP sublayer radio bearers. The SDAP sublayer offers to 5G core network quality of service (QoS) flows.

[0102] In the 3GPP NR system, the main services and functions of the MAC sublayer include: mapping between logical channels and transport channels; multiplexing / de-multiplexing of MAC SDUs belonging to one or different logical channels into / from transport blocks (TB) delivered to / from the physical layer on transport channels; scheduling information reporting; error correction through hybrid automatic repeat request (HARQ) (one HARQ entity per cell in case of carrier aggregation (CA)); priority handling between UEs by means of dynamic scheduling; priority handling between logical channels of one UE by means of logical channel prioritization; padding. A single MAC entity may support multiple numerologies, transmission timings and cells. Mapping restrictions in logical channel prioritization control which numerology(ies), cell(s), and transmission timing(s) a logical channel can use.

[0103] Different kinds of data transfer services are offered by MAC. To accommodate different kinds of data transfer services, multiple types of logical channels are defined, i.e., each supporting transfer of a particular type of information. Each logical channel type is defined by what type of information is transferred. Logical channels are classified into two groups: control channels and traffic channels. Control channels are used for the transfer of control plane information only, and traffic channels are used for the transfer of user plane information only. Broadcast control channel (BCCH) is a downlink logical channel for broadcasting system control information, paging control channel (PCCH) is a downlink logical channel that transfers paging information, system information change notifications and indications of ongoing public warning service (PWS) broadcasts, common control channel (CCCH) is a logical channel for transmitting control information between UEs and network and used for UEs having no RRC connection with the network, and dedicated control channel (DCCH) is a point-to-point bi-directional logical channel that transmits dedicated control information between a UE and the network and used by UEs having an RRC connection. Dedicated traffic channel (DTCH) is a point-to-point logical channel, dedicated to one UE, for the transfer of user information. A DTCH can exist in both uplink and downlink. In downlink, the following connections between logical channels and transport channels exist: BCCH can be mapped to broadcast channel (BCH); BCCH can be mapped to downlink shared channel (DL-SCH); PCCH can be mapped to paging channel (PCH); CCCH can be mapped to DL-SCH; DCCH can be mapped to DL-SCH; and DTCH can be mapped to DL-SCH. In uplink, the following connections between logical channels and transport channels exist: CCCH can be mapped to uplink shared channel (UL-SCH); DCCH can be mapped to UL-SCH; and DTCH can be mapped to UL-SCH.

[0104] The RLC sublayer supports three transmission modes: transparent mode (TM), unacknowledged mode (UM), and acknowledged node (AM). The RLC configuration is per logical channel with no dependency on numerologies and / or transmission durations. In the 3GPP NR system, the main services and functions of the RLC sublayer depend on the transmission mode and include: transfer of upper layer PDUs; sequence numbering independent of the one in PDCP (UM and AM); error correction through ARQ (AM only); segmentation (AM and UM) and re-segmentation (AM only) of RLC SDUs; reassembly of SDU (AM and UM); duplicate detection (AM only); RLC SDU discard (AM and UM); RLC re-establishment; protocol error detection (AM only).

[0105] In the 3GPP NR system, the main services and functions of the PDCP sublayer for the user plane include: sequence numbering; header compression and decompression using robust header compression (ROHC); transfer of user data; reordering and duplicate detection; in-order delivery; PDCP PDU routing (in case of split bearers); retransmission of PDCP SDUs; ciphering, deciphering and integrity protection; PDCP SDU discard; PDCP re-establishment and data recovery for RLC AM; PDCP status reporting for RLC AM; duplication of PDCP PDUs and duplicate discard indication to lower layers. The main services and functions of the PDCP sublayer for the control plane include: sequence numbering; ciphering, deciphering and integrity protection; transfer of control plane data; reordering and duplicate detection; in-order delivery; duplication of PDCP PDUs and duplicate discard indication to lower layers.

[0106] In the 3GPP NR system, the main services and functions of SDAP include: mapping between a QoS flow and a data radio bearer; marking QoS flow ID (QFI) in both DL and UL packets. A single protocol entity of SDAP is configured for each individual PDU session.

[0107] In the 3GPP NR system, the main services and functions of the RRC sublayer include: broadcast of system information related to AS and NAS; paging initiated by 5GC or NG-RAN; establishment, maintenance and release of an RRC connection between the UE and NG-RAN; security functions including key management; establishment, configuration, maintenance and release of signaling radio bearers (SRBs) and data radio bearers (DRBs); mobility functions (including: handover and context transfer, UE cell selection and reselection and control of cell selection and reselection, inter-RAT mobility); QoS management functions; UE measurement reporting and control of the reporting; detection of and recovery from radio link failure; NAS message transfer to / from NAS from / to UE.

[0108] FIG. 8 shows a frame structure in a 3GPP based wireless communication system to which implementations of the present disclosure is applied.

[0109] The frame structure shown in FIG. 8 is purely exemplary and the number of subframes, the number of slots, and / or the number of symbols in a frame may be variously changed. In the 3GPP based wireless communication system, OFDM numerologies (e.g., subcarrier spacing (SCS), transmission time interval (TTI) duration) may be differently configured between a plurality of cells aggregated for one UE. For example, if a UE is configured with different SCSs for cells aggregated for the cell, an (absolute time) duration of a time resource (e.g., a subframe, a slot, or a TTI) including the same number of symbols may be different among the aggregated cells. Herein, symbols may include OFDM symbols (or CP-OFDM symbols), SC-FDMA symbols (or discrete Fourier transform-spread-OFDM (DFT-s-OFDM) symbols).

[0110] Referring to FIG. 8, downlink and uplink transmissions are organized into frames. Each frame has Tf= 10ms duration. Each frame is divided into two half-frames, where each of the half-frames has 5ms duration. Each half-frame consists of 5 subframes, where the duration Tsfper subframe is 1ms. Each subframe is divided into slots and the number of slots in a subframe depends on a subcarrier spacing. Each slot includes 14 or 12 OFDM symbols based on a cyclic prefix (CP). In a normal CP, each slot includes 14 OFDM symbols and, in an extended CP, each slot includes 12 OFDM symbols. The numerology is based on exponentially scalable subcarrier spacing △f = 2u*15 kHz.

[0111] Table 1 shows the number of OFDM symbols per slot Nslotsymb, the number of slots per frameNframe,uslot, and the number of slots per subframe Nsubframe,uslotfor the normal CP, according to the subcarrier spacing △f = 2u*15 kHz.

[0112] uNslotsymbNframe,uslotNsubframe,uslot01410111420221440431480841416016

[0113] Table 2 shows the number of OFDM symbols per slot Nslotsymb, the number of slots per frameNframe,uslot, and the number of slots per subframe Nsubframe,uslotfor the extended CP, according to the subcarrier spacing △f = 2u*15 kHz.

[0114] uNslotsymbNframe,uslotNsubframe,uslot212404

[0115] A slot includes plural symbols (e.g., 14 or 12 symbols) in the time domain. For each numerology (e.g., subcarrier spacing) and carrier, a resource grid ofNsize,ugrid,x*NRBscsubcarriers andNsubframe,usymbOFDM symbols is defined, starting at common resource block (CRB)Nstart,ugridindicated by higher-layer signaling (e.g., RRC signaling), whereNsize,ugrid,xis the number of resource blocks (RBs) in the resource grid and the subscript x is DL for downlink and UL for uplink.NRBscis the number of subcarriers per RB. In the 3GPP based wireless communication system,NRBscis 12 generally. There is one resource grid for a given antenna portp, subcarrier spacing configurationu, and transmission direction (DL or UL). The carrier bandwidthNsize,ugridfor subcarrier spacing configurationuis given by the higher-layer parameter (e.g., RRC parameter). Each element in the resource grid for the antenna portpand the subcarrier spacing configurationuis referred to as a resource element (RE) and one complex symbol may be mapped to each RE. Each RE in the resource grid is uniquely identified by an indexkin the frequency domain and an indexlrepresenting a symbol location relative to a reference point in the time domain. In the 3GPP based wireless communication system, an RB is defined by 12 consecutive subcarriers in the frequency domain.

[0116] In the 3GPP NR system, RBs are classified into CRBs and physical resource blocks (PRBs). CRBs are numbered from 0 and upwards in the frequency domain for subcarrier spacing configurationu. The center of subcarrier 0 of CRB 0 for subcarrier spacing configurationucoincides with 'point A' which serves as a common reference point for resource block grids. In the 3GPP NR system, PRBs are defined within a bandwidth part (BWP) and numbered from 0 toNsizeBWP,i-1, where i is the number of the bandwidth part. The relation between the physical resource block nPRBin the bandwidth part i and the common resource block nCRBis as follows: nPRB= nCRB+NsizeBWP,i, whereNsizeBWP,iis the common resource block where bandwidth part starts relative to CRB 0. The BWP includes a plurality of consecutive RBs. A carrier may include a maximum of N (e.g., 5) BWPs. A UE may be configured with one or more BWPs on a given component carrier. Only one BWP among BWPs configured to the UE can active at a time. The active BWP defines the UE's operating bandwidth within the cell's operating bandwidth.

[0117] The NR frequency band may be defined as two types of frequency range, i.e., FR1 and FR2. The numerical value of the frequency range may be changed. For example, the frequency ranges of the two types (FR1 and FR2) may be as shown in Table 3 below. For ease of explanation, in the frequency ranges used in the NR system, FR1 may mean "sub 6 GHz range", FR2 may mean "above 6 GHz range," and may be referred to as millimeter wave (mmW).

[0118] Frequency Range designationCorresponding frequency rangeSubcarrier SpacingFR1450MHz - 6000MHz15, 30, 60kHzFR224250MHz - 52600MHz60, 120, 240kHz

[0119] As mentioned above, the numerical value of the frequency range of the NR system may be changed. For example, FR1 may include a frequency band of 410MHz to 7125MHz as shown in Table 4 below. That is, FR1 may include a frequency band of 6GHz (or 5850, 5900, 5925 MHz, etc.) or more. For example, a frequency band of 6 GHz (or 5850, 5900, 5925 MHz, etc.) or more included in FR1 may include an unlicensed band. Unlicensed bands may be used for a variety of purposes, for example for communication for vehicles (e.g., autonomous driving).

[0120] Frequency Range designationCorresponding frequency rangeSubcarrier SpacingFR1410MHz - 7125MHz15, 30, 60kHzFR224250MHz - 52600MHz60, 120, 240kHz

[0121] In the present disclosure, the term "cell" may refer to a geographic area to which one or more nodes provide a communication system, or refer to radio resources. A "cell" as a geographic area may be understood as coverage within which a node can provide service using a carrier and a "cell" as radio resources (e.g., time-frequency resources) is associated with bandwidth which is a frequency range configured by the carrier. The "cell" associated with the radio resources is defined by a combination of downlink resources and uplink resources, for example, a combination of a DL component carrier (CC) and a UL CC. The cell may be configured by downlink resources only, or may be configured by downlink resources and uplink resources. Since DL coverage, which is a range within which the node is capable of transmitting a valid signal, and UL coverage, which is a range within which the node is capable of receiving the valid signal from the UE, depends upon a carrier carrying the signal, the coverage of the node may be associated with coverage of the "cell" of radio resources used by the node. Accordingly, the term "cell" may be used to represent service coverage of the node sometimes, radio resources at other times, or a range that signals using the radio resources can reach with valid strength at other times.

[0122] In CA, two or more CCs are aggregated. A UE may simultaneously receive or transmit on one or multiple CCs depending on its capabilities. CA is supported for both contiguous and non-contiguous CCs. When CA is configured, the UE only has one RRC connection with the network. At RRC connection establishment / re-establishment / handover, one serving cell provides the NAS mobility information, and at RRC connection re-establishment / handover, one serving cell provides the security input. This cell is referred to as the primary cell (PCell). The PCell is a cell, operating on the primary frequency, in which the UE either performs the initial connection establishment procedure or initiates the connection re-establishment procedure. Depending on UE capabilities, secondary cells (SCells) can be configured to form together with the PCell a set of serving cells. An SCell is a cell providing additional radio resources on top of special cell (SpCell). The configured set of serving cells for a UE therefore always consists of one PCell and one or more SCells. For dual connectivity (DC) operation, the term SpCell refers to the PCell of the master cell group (MCG) or the primary SCell (PSCell) of the secondary cell group (SCG). An SpCell supports PUCCH transmission and contention-based random access, and is always activated. The MCG is a group of serving cells associated with a master node, comprised of the SpCell (PCell) and optionally one or more SCells. The SCG is the subset of serving cells associated with a secondary node, comprised of the PSCell and zero or more SCells, for a UE configured with DC. For a UE in RRC_CONNECTED not configured with CA / DC, there is only one serving cell comprised of the PCell. For a UE in RRC_CONNECTED configured with CA / DC, the term "serving cells" is used to denote the set of cells comprised of the SpCell(s) and all SCells. In DC, two MAC entities are configured in a UE: one for the MCG and one for the SCG.

[0123] FIG. 9 shows a data flow example in the 3GPP NR system to which implementations of the present disclosure is applied.

[0124] Referring to FIG. 9, "RB" denotes a radio bearer, and "H" denotes a header. Radio bearers are categorized into two groups: DRBs for user plane data and SRBs for control plane data. The MAC PDU is transmitted / received using radio resources through the PHY layer to / from an external device. The MAC PDU arrives to the PHY layer in the form of a transport block.

[0125] In the PHY layer, the uplink transport channels UL-SCH and RACH are mapped to their physical channels PUSCH and PRACH, respectively, and the downlink transport channels DL-SCH, BCH and PCH are mapped to PDSCH, PBCH and PDSCH, respectively. In the PHY layer, uplink control information (UCI) is mapped to PUCCH, and downlink control information (DCI) is mapped to PDCCH. A MAC PDU related to UL-SCH is transmitted by a UE via a PUSCH based on an UL grant, and a MAC PDU related to DL-SCH is transmitted by a BS via a PDSCH based on a DL assignment.

[0126] Hereinafter, technical features related to Paging are described. Sections of 3GPP TS 38.304 v18.2.0 may be referred.

[0127] Discontinuous Reception for paging

[0128] The UE may use Discontinuous Reception (DRX) in RRC_IDLE and RRC_INACTIVE state in order to reduce power consumption. The UE monitors one paging occasion (PO) per DRX cycle. A PO is a set of PDCCH monitoring occasions and can consist of multiple time slots (e.g. subframe or OFDM symbol) where paging DCI can be sent (TS 38.213 [4]). One Paging Frame (PF) is one Radio Frame and may contain one or multiple PO(s) or starting point of a PO. A L2 U2N Relay UE monitors the paging occasions of its PC5-RRC connected L2 U2N Remote UEs. In this case, the DRX cycle and UE ID mentioned in this clause refer to those of the L2 U2N Remote UE.

[0129] In multi-beam operations, the UE assumes that the same paging message and the same Short Message are repeated in all transmitted beams and thus the selection of the beam(s) for the reception of the paging message and Short Message is up to UE implementation. The paging message is same for both RAN initiated paging and CN initiated paging.

[0130] The UE initiates RRC Connection Resume procedure upon receiving RAN initiated paging. If the UE receives a CN initiated paging in RRC_INACTIVE state, the UE moves to RRC_IDLE and informs NAS. However, if a L2 U2N Relay UE in RRC_INACTIVE state receives a CN initiated paging for a L2 U2N Remote UE, the L2 U2N Relay UE does not move to RRC_IDLE state.

[0131] - The L2 U2N Remote UE does not need to monitor the PO in order to receive the paging message.

[0132] - While the SDT procedure is ongoing in RRC_INACTIVE state, the UE monitors the PO in order to receive only the Short Message as specified in TS 38.331 [3].

[0133] The PF and PO for paging are determined by the following formulae:

[0134] SFN for the PF is determined by:

[0135] (SFN + PF_offset) mod T = (T div N)*(UE_ID mod N)

[0136] Index (i_s), indicating the index of the PO is determined by:

[0137] i_s = floor (UE_ID / N) mod Ns

[0138] The PDCCH monitoring occasions for paging are determined according topagingSearchSpaceandfirstPDCCH-MonitoringOccasionOfPOandnrofPDCCH-MonitoringOccasionPerSSB-InPOifconfigured. WhenSearchSpaceId= 0 is configured forpagingSearchSpace, the PDCCH monitoring occasions for paging are same as for RMSI.

[0139] WhenSearchSpaceId= 0 is configured forpagingSearchSpace, Ns is either 1 or 2. For Ns = 1, there is only one PO which starts from the first PDCCH monitoring occasion for paging in the PF. For Ns = 2, PO is either in the first half frame (i_s = 0) or the second half frame (i_s = 1) of the PF.

[0140] WhenSearchSpaceIdother than 0 is configured forpagingSearchSpace,the UE monitors the (i_s + 1)thPO. A PO is a set of 'S*X ' consecutive PDCCH monitoring occasions where 'S' is the number of actual transmitted SSBs determined according tossb-PositionsInBurstinSIB1and X is thenrofPDCCH-MonitoringOccasionPerSSB-InPOif configured or is equal to 1 otherwise. The [x*S+K]thPDCCH monitoring occasion for paging in the PO corresponds to the Kthtransmitted SSB, where x=0,1, .. ,X-1, K=1,2, .. ,S. The PDCCH monitoring occasions for paging which do not overlap with UL symbols (determined according totdd-UL-DL-ConfigurationCommon) are sequentially numbered from zero starting from the first PDCCH monitoring occasion for paging in the PF. WhenfirstPDCCH-MonitoringOccasionOfPOis present, the starting PDCCH monitoring occasion number of (i_s + 1)thPO is the (i_s + 1)thvalue of thefirstPDCCH-MonitoringOccasionOfPOparameter; otherwise, it is equal to i_s * S*X. If X > 1, when the UE detects a PDCCH transmission addressed to P-RNTI within its PO, the UE is not required to monitor the subsequent PDCCH monitoring occasions for this PO.

[0141] - A PO associated with a PF may start in the PF or after the PF.

[0142] - The PDCCH monitoring occasions for a PO can span multiple radio frames. WhenSearchSpaceIdother than 0 is configured forpaging-SearchSpacethe PDCCH monitoring occasions for a PO can span multiple periods of the paging search space.

[0143] The following parameters are used for the calculation of PF and i_s above:

[0144] T: DRX cycle of the UE.

[0145] If the UE does not operate in eDRX as defined:

[0146] - T is determined by the shortest of the UE specific DRX value configured by RRC (if any), the UE specific DRX value configured by upper layers (if any), and a default DRX value broadcast in system information. For L2 U2N Relay UE, T for a L2 U2N Remote UE is determined by the shortest of the UE specific DRX value provided in PC5-RRC signalling and a default DRX value broadcast in system information.

[0147] In RRC_IDLE state, if the UE operates in eDRX and eDRX is configured by upper layers, i.e., TeDRX,CN:

[0148] - If TeDRX,CNis no longer than 1024 radio frames:

[0149] - T = TeDRX,CN;

[0150] - else:

[0151] - During CN configured PTW, T is determined by the shortest of UE specific DRX value, if configured by upper layers, and the default DRX value broadcast in system information.

[0152] In RRC_INACTIVE state, if the UE operates in eDRX and eDRX is configured by RRC, i.e., TeDRX, RAN(if any), and upper layers, i.e., TeDRX,CN:

[0153] - If both TeDRX,CNand used TeDRX, RANare no longer than 1024 radio frames:

[0154] - T = min{TeDRX, RAN, TeDRX,CN}.

[0155] - If TeDRX,CNis no longer than 1024 radio frames and no TeDRX, RANis configured or used:

[0156] - T is determined by the shortest of UE specific DRX value configured by RRC and TeDRX,CN.

[0157] - If TeDRX,CNis longer than 1024 radio frames:

[0158] - If TeDRX, RANis not configured or used:

[0159] - During CN configured PTW, T is determined by the shortest of the UE specific DRX value configured by RRC, the UE specific DRX value configured by upper layers (if any), and a default DRX value broadcast in system information. Outside the CN configured PTW, T is determined by the UE specific DRX value configured by RRC;

[0160] - else if used TeDRX, RANis no longer than 1024 radio frames:

[0161] - During CN configured PTW, T is determined by the shortest of the UE specific DRX value, if configured by upper layers and TeDRX, RAN, and a default DRX value broadcast in system information. Outside the CN configured PTW, T is determined by TeDRX, RAN;

[0162] - else if used TeDRX, RANis longer than 1024 radio frames:

[0163] - During the overlapped part of CN configured PTW and RAN configured PTW, T is determined by the shortest of the UE specific DRX value configured by RRC, the UE specific DRX value configured by upper layers (if any), and a default DRX value broadcast in system information;

[0164] - During CN configured PTW and outside RAN configured PTW, T is determined by the shortest of the UE specific DRX value configured by upper layers (if any), and a default DRX value broadcast in system information;

[0165] - Outside CN configured PTW and during RAN configured PTW, T is determined by the UE specific DRX value configured by RRC.

[0166] N: number of total paging frames in T

[0167] Ns: number of paging occasions for a PF

[0168] PF_offset: offset used for PF determination

[0169] UE_ID:

[0170] If the UE operates in eDRX:

[0171] - 5G-S-TMSI mod 4096

[0172] else:

[0173] - 5G-S-TMSI mod 1024

[0174] ParametersNs,nAndPagingFrameOffset,nrofPDCCH-MonitoringOccasionPerSSB-InPO, and the length of default DRX Cycle are signaled inSIB1. The values of N and PF_offset are derived from the parameternAndPagingFrameOffset. The parameterfirstPDCCH-MonitoringOccasionOfPOis signalled inSIB1for paging in the BWP configured byinitialDownlinkBWP.For paging in a DL BWP other than the BWP configured byinitialDownlinkBWP, the parameterfirst-PDCCH-MonitoringOccasionOfPOis signaled in the corresponding BWP configuration.

[0175] If the UE has no 5G-S-TMSI, for instance when the UE has not yet registered onto the network, the UE shall use as default identity UE_ID = 0 in the PF and i_s formulas above.

[0176] 5G-S-TMSI is a 48 bit long bit string. 5G-S-TMSI shall in the formulae above be interpreted as a binary number where the left most bit represents the most significant bit.

[0177] In RRC_INACTIVE state, if the UE supportsinactiveStatePO-Determinationand the network broadcastsranPagingInIdlePOwith value "true", the UE shall use the same i_s as for RRC_IDLE state. Otherwise, the UE determines the i_s based on the parameters and formula above.

[0178] In RRC_INACTIVE state, if used eDRX value configured by upper layers is no longer than 1024 radio frames, the UE shall use the same i_s as for RRC_IDLE state.

[0179] In RRC_INACTIVE state, if used eDRX value configured by upper layers is longer than 1024 radio frames, during CN PTW, the UE shall use the same i_s as for RRC_IDLE state. Outside CN PTW, the UE shall use the i_s for RRC_INACTIVE state.

[0180] Paging Early Indication

[0181] The UE may use Paging Early Indication (PEI) in RRC_IDLE and RRC_INACTIVE states in order to reduce power consumption. If PEI configuration is provided in system information, the UE in RRC_IDLE or RRC_INACTIVE state supporting PEI (except for the UEs expecting MBS group notification) can monitor PEI using PEI parameters in system information according to the procedure described below.

[0182] IflastUsedCellOnlyis configured in system information of a cell, the UE monitors PEI in this cell only if the UE most recently receivedRRCReleasewithoutnoLastCellUpdatein this cell. Otherwise (i.e., iflastUsedCellOnlyis not configured in system information of a cell), the UE monitors PEI in the camped cell.

[0183] The UE monitors one PEI occasion per DRX cycle. A PEI occasion (PEI-O) is a set of PDCCH monitoring occasions (MOs) and can consist of multiple time slots (e.g. subframes or OFDM symbols) where PEI can be sent. In multi-beam operations, the UE assumes that the same PEI is repeated in all transmitted beams and thus the selection of the beam(s) for the reception of the PEI is up to UE implementation.

[0184] The time location of PEI-O for UE's PO is determined by a reference point and an offset:

[0185] - The reference point is the start of a reference frame determined by a frame-level offset from the start of the first PF of the PF(s) associated with the PEI-O, provided bypei-FrameOffsetin SIB1;

[0186] - The offset is a symbol-level offset from the reference point to the start of the first PDCCH MO of this PEI-O, provided byfirstPDCCH-MonitoringOccasionOfPEI-Oin SIB1.

[0187] If one PEI-O is associated with POs of two PFs, the two PFs are consecutive PFs calculated by the parameters PF_offset, T, Ns, and N. The first PF of the PFs associated with the PEI-O is provided by (SFN for PF) - floor (iPO / Ns)*T / N.

[0188] The PDCCH MOs for PEI are determined according topei-SearchSpace,pei-FrameOffset,firstPDCCH-MonitoringOccasionOfPEI-OandnrofPDCCH-MonitoringOccasionPerSSB-InPOifconfigured. WhenSearchSpaceId= 0 is configured forpei-SearchSpace, the PDCCH MOs for PEI are same as for RMSI. UE determines first PDCCH MO for PEI-O based onpei-FrameOffsetandfirstPDCCH-MonitoringOccasionOfPEI-O, as for the case withSearchSpaceId> 0 configured.

[0189] WhenSearchSpaceId= 0 is configured forpei-SearchSpace, the UE monitors the PEI-O according tosearchSpaceZero. WhenSearchSpaceIdother than 0 is configured forpei-SearchSpace,the UE monitors the PEI-O according to the search space with the configuredSearchSpaceId.

[0190] A PEI occasion is a set of 'S*X' consecutive PDCCH MOs, where 'S' is the number of actual transmitted SSBs determined according tossb-PositionsInBurstinSIB1, and X is thenrofPDCCH-MonitoringOccasionPerSSB-InPOif configured or is equal to 1 otherwise. The [x*S+K]thPDCCH MO for PEI in the PEI-O corresponds to the Kthtransmitted SSB, where x=0,1, .. ,X-1, K=1,2, .. ,S. The PDCCH MOs for PEI which do not overlap with UL symbols (determined according totdd-UL-DL-ConfigurationCommon) are sequentially numbered from zero starting from the first PDCCH MO for PEI in the PEI-O. When the UE detects a PEI within its PEI-O, the UE is not required to monitor the subsequent MO(s) associated with the same PEI-O.

[0191] If the UE detects PEI and the PEI indicates the subgroup the UE belongs to monitor its associated PO, the UE monitors the associated PO. If the UE does not detect PEI on the monitored PEI occasion or the PEI does not indicate the subgroup the UE belongs to monitor its associated PO, the UE is not required to monitor the associated PO.

[0192] If the UE is unable to monitor the PEI occasion (i.e. all valid PDCCH MO for PEI) corresponding to its PO, e.g. during cell re-selection, the UE monitors the associated PO.

[0193] In RRC_INACTIVE state, when the UE uses the same i-_s as for RRC_IDLE state as specified in clause 7.1, the UE shall use the same iPOas for RRC_IDLE state. Otherwise, the UE determines the iPObased on the formula.

[0194] Subgrouping

[0195] If PEI and subgrouping are configured, UEs monitoring the same PO can be divided into one or more subgroups. With subgrouping, the UE monitors the associated PO if the corresponding bit for subgroup the UE belongs to is indicated as 1 by PEI corresponding to its PO.

[0196] The following parameters are used for the determination of subgroup ID:

[0197] -subgroupsNumPerPO: total number of subgroups for both CN assigned subgrouping (if any) and UE_ID based subgrouping (if any) in a PO, which is broadcasted in system information;

[0198] -subgroupsNumForUEID: number of subgroups for UE_ID based subgrouping in a PO, which is broadcasted in system information.

[0199] UE's subgroup can be either assigned by CN or formed based on UE_ID:

[0200] - IfsubgroupsNumForUEIDis absent insubgroupConfig, the subgroup ID based on CN assigned subgrouping, if available for the UE, is used in the cell.

[0201] - If bothsubgroupsNumPerPOandsubgroupsNumForUEIDare configured, andsubgroupsNumForUEIDhas the same value assubgroupsNumPerPO, the subgroup ID based on UE_ID based subgrouping is used in the cell.

[0202] - If bothsubgroupsNumPerPOandsubgroupsNumForUEIDare configured, andsubgroupsNumForUEID<subgroupsNumPerPO:

[0203] - The subgroup ID based on CN assigned subgrouping, if available for the UE, is used in the cell;

[0204] - Otherwise, the subgroup ID based on UE_ID based subgrouping is used in the cell.

[0205] If a UE has no CN assigned subgroup ID or does not support CN assigned subgrouping, and there is no configuration forsubgroupsNumForUEID, the UE monitors the associated PO.

[0206] CNassignedsubgrouping

[0207] Paging with CN assigned subgrouping is used in the cell which supports CN assigned subgrouping. A UE supporting CN assigned subgrouping in RRC_IDLE or RRC_INACTIVE state can be assigned a subgroup ID (between 0 to 7) by AMF through NAS signalling. The UE belonging to the assigned subgroup ID monitors its associated PEI which indicates the paged subgroup(s).

[0208] UE_ID basedsubgrouping

[0209] Paging with UE_ID based subgrouping is used in the cell which supports UE_ID based subgrouping.

[0210] If the UE is not configured with a CN assigned subgroup ID, or if the UE configured with a CN assigned subgroup ID is in a cell supporting only UE_ID based subgrouping, the subgroup ID of the UE is determined by the formula below:

[0211] SubgroupID = (floor(UE_ID / (N*Ns)) mod subgroupsNumForUEID) + (subgroupsNumPerPO - subgroupsNumForUEID),

[0212] where:

[0213] N: number of total paging frames in T, which is the DRX cycle of RRC_IDLE state

[0214] Ns: number of paging occasions for a PF

[0215] UE_ID: 5G-S-TMSI mod X, where X is 32768, if eDRX is applied; otherwise, X is 8192

[0216] subgroupsNumForUEID: number of subgroups for UE_ID based subgrouping in a PO, which is broadcasted in system information

[0217] In RRC_INACTIVE state with CN configured PTW the SubgroupID used outside CN PTW is the same as the SubgroupID used inside CN PTW.

[0218] The UE belonging to the SubgroupID monitors its associated PEI which indicates the paged subgroup(s).

[0219] Meanwhile, a UE belongs to a single paging group / sub-group. Network does not know whether UEs belonging to a specific paging group / sub-group is camping on or not. Therefore, the gNB broadcasts the Paging information for all paging groups / subgroups when it is received from the core network.

[0220] For example, only UEs which belong to paging group #1 or #2 are camping on a cell. The cell only needs to transmit the Paging information when the paging is generated for UE belonging to the paging group #1 or #2. However, the cell does not know that, and wastes radio resource transmitting the Paging information even for UEs which not belong to the paging group #1 or #2.

[0221] Therefore, studies for on-demand paging are required.

[0222] Hereinafter, a method for on-demand paging, according to some embodiments of the present disclosure, will be described with reference to the following drawings.

[0223] The following drawings are created to explain specific embodiments of the present disclosure. The names of the specific devices or the names of the specific signals / messages / fields shown in the drawings are provided by way of example, and thus the technical features of the present disclosure are not limited to the specific names used in the following drawings. Herein, a wireless device may be referred to as a user equipment (UE).

[0224] FIG. 10 shows an example of a method for on-demand paging, according to some embodiments of the present disclosure.

[0225] In particular, FIG. 10 shows an example of a method performed by a wireless device in a wireless communication system.

[0226] In step S1001, the wireless device may determine a paging group of the wireless device.

[0227] For example, the wireless device may determine a paging group identity or a paging subgroup identity based on UE identity.

[0228] For another example, a paging group identity or a paging subgroup identity can be assigned by network.

[0229] For example, the wireless device may determine whether to transmit the paging request to network based on the paging group or the paging subgroup.

[0230] For example, if the wireless device determines to request paging transmission, the wireless device may select random access resource corresponding to the paging group or the paging subgroup.

[0231] In step S1002, the wireless device may receive, from a network, a configuration for a paging request.

[0232] For example, the configuration for the paging request may include a configuration for MSG1 based paging request.

[0233] For example, the configuration for the paging request may include a configuration of dedicated RACH occasion for paging request.

[0234] For example, the configuration for the paging request may include a configuration of dedicated RACH preamble for paging request.

[0235] For example, the configuration for the paging request may include information needed for the wireless device to derive the paging group or the paging subgroup from the UE identity.

[0236] For example, the configuration for the paging request can be transmitted via system information.

[0237] For example, different dedicated RACH occasion or random access preamble can be configured for different paging group or different paging subgroup.

[0238] For example, the wireless device may determine RACH occasion and / or random access preamble corresponding the paging group or the paging subgroup.

[0239] In step S1003, the wireless device may transmit, to the network, a paging request including information related to the paging group of the wireless device.

[0240] For example, the paging request may include a request for a paging message for one or more wireless devices included in the paging group.

[0241] For example, the wireless device may receive, from the network, paging poll information.

[0242] For example, the paging poll information may inform whether a paging request for paging transmission from the network is needed or not.

[0243] For example, the wireless device may determine whether to transmit the paging request to the network, based on the paging poll information.

[0244] For example, the paging poll information may be included in a paging early indication.

[0245] For example, the paging poll information may be transmitted per paging group. For example, the paging poll information may be transmitted per paging subgroup.

[0246] For example, the paging poll information may include i) information informing that a paging request is needed for a first paging group and ii) information informing that a paging request is not needed for a second paging group. For example, the wireless device may initiate transmission of the paging request including information related to the paging group of the wireless device, based on that the wireless device belongs to the first paging group.

[0247] For example, the paging request may include a random access preamble. For example, the wireless device could transmit the random access preamble which is allocated for the paging request.

[0248] For example, the wireless device may monitor a random access response, after transmitting the paging request. The wireless device may consider that the paging request is successfully completed upon receiving the random access response.

[0249] For example, the wireless device may select a random access resource corresponding to the paging group of the wireless device. The random access preamble may be transmitted based on the selected random access resource.

[0250] In step S1004, the wireless device may monitor a paging occasion.

[0251] For example, the wireless device may receive the paging message from the paging occasion.

[0252] For example, the network may provide the paging message only for the paging group, only when at least one wireless device included in the paging group transmits the paging request. That is, if non of the wireless device included in a certain paging group transmits the paging request to the network, the network may not provide the paging message for the certain group.

[0253] According to some embodiments of the present disclosure, the wireless device may determine a paging sub-group of the wireless device. The wireless device may transmit, to the network, a paging request including information related to the paging sub-group of the wireless device. The wireless device may monitor a paging occasion.

[0254] According to some embodiments of the present disclosure, the wireless device may be in communication with at least one of a user equipment, a network, or an autonomous vehicle other than the wireless device.

[0255] Hereinafter, technical features related to on-demand paging are described.

[0256] If UE receives a poll indicator from network, the UE transmits a random access preamble to the network using random access resource corresponding to its paging group / sub-group.

[0257] Poll indicator

[0258] The poll indicator can be transmitted per paging (sub-)group.

[0259] The poll indicator for a paging (sub-)group indicates whether UE belonging to the paging (sub-)group needs to request the paging transmission from the network. For example, If the poll indicator is set to TRUE for a paging (sub-)group, or if the poll indicator is present for a paging (sub-)group, UE belonging to the paging (sub-)group transmits a paging request to the network. If the poll indicator is set to FALSE for a paging (sub-)group, or if the poll indicator is absent for a paging (sub-)group, UE belonging to the paging (sub-)group considers that it can receive paging without requesting the paging transmission.

[0260] A single poll indicator can be transmitted for all paging (sub-)groups. In this case, the poll indicator indicates that all UEs need to request the paging transmission from the network.

[0261] The poll indicator can be transmitted in the paging early indication, e.g. via paging DCI.

[0262] Paging request

[0263] UE can request Paging transmission from network by transmitting a random access preamble to the network using random access resource corresponding to its paging group / sub-group.

[0264] After transmitting the random access preamble to the network, the UE monitors random access response.

[0265] If the random access response is received in response to the random access preamble transmission, the UE considers the paging request successfully completed.

[0266] Paging (sub-)group for polling

[0267] UE determines a paging (sub-)group identity for polling based on its UE identity

[0268] Alternatively, a paging (sub-)group identity can be assigned by network. For instance, UE is configured with a CN assigned (sub-)group identity for polling.

[0269] UE determines whether to transmit the paging request to network based on the poll indicator corresponding to its paging (sub-)group identity for polling.

[0270] If UE determines to request paging transmission, it selects random access resource corresponding to its paging (sub-)group identity for polling.

[0271] Paging request configuration

[0272] The paging request configuration contains configuration for MSG1 based Paging request.

[0273] The paging request configuration contains configuration of dedicated RACH occasion for paging request.

[0274] The paging request configuration contains configuration of dedicated RACH preamble for paging request.

[0275] The paging request configuration contains information needed for UE to derive the paging (sub-)group identity from the UE identity, e.g. the number of (sub-)groups.

[0276] The paging request configuration can be transmitted via system information.

[0277] For different paging (sub-)group for polling, different dedicated RACH occasion / preamble can be configured.

[0278] UE determines RACH occasion and / or RACH preamble corresponding its paging (sub-)group identity according to the Paging request configuration.

[0279] FIG. 11 shows an example of a method for on-demand paging.

[0280] In particular, FIG. 11 shows an example of a method performed by UE#1 and UE#2 in a wireless communication system.

[0281] In step S1101, UE#1 and UE#2 in RRC_IDLE receives the Paging request configuration from network.

[0282] In step S1102, UE#1 and UE#2 calculate the paging (sub-)group identity based on their UE identity. The paging (sub-)group identity of UE#1 and UE#2 are group#1 and group#2, respectively.

[0283] In step S1103, UE#1 and UE#2 receives the Paging poll information from network. In the Paging poll information, the poll indicator is present only for paging (sub-)group#1 and paging (sub-)group#3, i.e. no poll indicator for paging (sub-)group#2.

[0284] In step S1104, UE#2 considers that it does not need to request paging transmission. UE#1 selects a random access resource corresponding to the paging (sub-)group#1 according to the paging request configuration. UE#1 transmits a random access preamble to the network using the selected random access resource. No UE which belongs to paging (sub-)group#3 is camping on the network. The network becomes aware that there are no UEs belonging to the paging (sub-)group#3 through the paging polling. The network does not transmit the paging information for UEs belonging to the paging (sub-)group#3.

[0285] In step S1105, UE#1 and UE#2 monitors the paging occasion.

[0286] FIG. 12 shows an example of a method for on-demand paging.

[0287] In particular, FIG. 12 shows an example of a method performed by a wireless device in a wireless communication system.

[0288] In step S1201, the wireless device may determine a paging group.

[0289] In step S1202, the wireless device may receive a configuration for paging request, which includes configuration for dedicated random access resource for paging request.

[0290] In step S1203, the wireless device may receive a paging poll indicator for the paging group.

[0291] In step S1204, the wireless device may select random access resource corresponding to the paging group.

[0292] In step S1205, the wireless device may transmit a random access preamble using the selected random access resource.

[0293] Some of the detailed steps shown in the examples of FIGS. 10 - 12 may not be essential steps and may be omitted. In addition to the steps shown in FIGS. 10 - 12, other steps may be added, and the order of the steps may vary. Some of the above steps may have their own technical meaning.

[0294] Hereinafter, an apparatus for on-demand paging, according to some embodiments of the present disclosure, will be described. Herein, the apparatus may be a wireless device (100 or 200) in FIGS. 2, 3, 5, and 10.

[0295] For example, a wireless device may perform methods described above. The detailed description overlapping with the above-described contents could be simplified or omitted.

[0296] Referring to FIG. 5, a wireless device 100 may include a processor 102, a memory 104, and a transceiver 106.

[0297] According to some embodiments of the present disclosure, the processor 102 may be configured to be coupled operably with the memory 104 and the transceiver 106.

[0298] For example, the wireless device may include at least one transceiver, at least one processor, and at least one memory operably connectable to the at least one processor and storing instructions that, based on being executed by the at least one processor, perform operations.

[0299] The operations comprise: determining a paging group of the wireless device; receiving, from a network, a configuration for a paging request; transmitting, to the network, a paging request including information related to the paging group of the wireless device; and monitoring a paging occasion.

[0300] For example, the paging request may include a request for a paging message for one or more wireless devices included in the paging group.

[0301] For example, the operations further comprise: receiving, from the network, paging poll information.

[0302] For example, the paging poll information informs whether a paging request for paging transmission from the network is needed or not.

[0303] For example, the operations further comprise: determining whether to transmit the paging request to the network, based on the paging poll information.

[0304] For example, the paging poll information is included in a paging early indication.

[0305] For example, the paging poll information is transmitted per paging group.

[0306] For example, the paging poll information includes i) information informing that a paging request is needed for a first paging group and ii) information informing that a paging request is not needed for a second paging group.

[0307] For example, the operations further comprise: initiating transmission of the paging request including information related to the paging group of the wireless device, based on that the wireless device belongs to the first paging group.

[0308] For example, the paging request includes a random access preamble.

[0309] For example, the operations further comprise: monitoring a random access response, after transmitting the paging request; and considering that the paging request is successfully completed upon receiving the random access response.

[0310] For example, the operations further comprise: selecting a random access resource corresponding to the paging group of the wireless device, wherein the random access preamble is transmitted based on the selected random access resource.

[0311] For example, the operations further comprise: determining a paging sub-group of the wireless device; and transmitting, to the network, a paging request including information related to the paging sub-group of the wireless device.

[0312] For example, the processor may be adapted to be in communication with at least one of a user equipment, a network, or an autonomous vehicle other than the wireless device.

[0313] Hereinafter, a processor for a wireless device for on-demand paging, according to some embodiments of the present disclosure, will be described.

[0314] The processor may be adapted to control the wireless device to perform operations.

[0315] The operations comprise: determining a paging group of the wireless device; receiving, from a network, a configuration for a paging request; transmitting, to the network, a paging request including information related to the paging group of the wireless device; and monitoring a paging occasion.

[0316] For example, the paging request may include a request for a paging message for one or more wireless devices included in the paging group.

[0317] For example, the operations further comprise: receiving, from the network, paging poll information.

[0318] For example, the paging poll information informs whether a paging request for paging transmission from the network is needed or not.

[0319] For example, the operations further comprise: determining whether to transmit the paging request to the network, based on the paging poll information.

[0320] For example, the paging poll information is included in a paging early indication.

[0321] For example, the paging poll information is transmitted per paging group.

[0322] For example, the paging poll information includes i) information informing that a paging request is needed for a first paging group and ii) information informing that a paging request is not needed for a second paging group.

[0323] For example, the operations further comprise: initiating transmission of the paging request including information related to the paging group of the wireless device, based on that the wireless device belongs to the first paging group.

[0324] For example, the paging request includes a random access preamble.

[0325] For example, the operations further comprise: monitoring a random access response, after transmitting the paging request; and considering that the paging request is successfully completed upon receiving the random access response.

[0326] For example, the operations further comprise: selecting a random access resource corresponding to the paging group of the wireless device, wherein the random access preamble is transmitted based on the selected random access resource.

[0327] For example, the operations further comprise: determining a paging sub-group of the wireless device; and transmitting, to the network, a paging request including information related to the paging sub-group of the wireless device.

[0328] For example, the processor may be adapted to control the wireless device to be in communication with at least one of a user equipment, a network, or an autonomous vehicle other than the wireless device.

[0329] Hereinafter, a non-transitory computer-readable medium has stored thereon a plurality of instructions for on-demand paging, according to some embodiments of the present disclosure, will be described.

[0330] According to some embodiment of the present disclosure, the technical features of the present disclosure could be embodied directly in hardware, in a software executed by a processor, or in a combination of the two. For example, a method performed by a wireless device in a wireless communication may be implemented in hardware, software, firmware, or any combination thereof. For example, a software may reside in RAM memory, flash memory, ROM memory, EPROM memory, EEPROM memory, registers, hard disk, a removable disk, a CD-ROM, or any other storage medium.

[0331] Some example of storage medium is coupled to the processor such that the processor can read information from the storage medium. In the alternative, the storage medium may be integral to the processor. The processor and the storage medium may reside in an ASIC. For another example, the processor and the storage medium may reside as discrete components.

[0332] The computer-readable medium may include a tangible and non-transitory computer-readable storage medium.

[0333] For example, non-transitory computer-readable media may include random access memory (RAM) such as synchronous dynamic random access memory (SDRAM), read-only memory (ROM), non-volatile random access memory (NVRAM), electrically erasable programmable read-only memory (EEPROM), FLASH memory, magnetic or optical data storage media, or any other medium that can be used to store instructions or data structures. Non-transitory computer-readable media may also include combinations of the above.

[0334] In addition, the method described herein may be realized at least in part by a computer-readable communication medium that carries or communicates code in the form of instructions or data structures and that can be accessed, read, and / or executed by a computer.

[0335] According to some embodiment of the present disclosure, a non-transitory computer-readable medium has stored thereon a plurality of instructions. The stored a plurality of instructions may be executed by a processor of a wireless device. The stored a plurality of instructions may cause the wireless device to perform operations.

[0336] The operations comprise: determining a paging group of the wireless device; receiving, from a network, a configuration for a paging request; transmitting, to the network, a paging request including information related to the paging group of the wireless device; and monitoring a paging occasion.

[0337] For example, the paging request may include a request for a paging message for one or more wireless devices included in the paging group.

[0338] For example, the operations further comprise: receiving, from the network, paging poll information.

[0339] For example, the paging poll information informs whether a paging request for paging transmission from the network is needed or not.

[0340] For example, the operations further comprise: determining whether to transmit the paging request to the network, based on the paging poll information.

[0341] For example, the paging poll information is included in a paging early indication.

[0342] For example, the paging poll information is transmitted per paging group.

[0343] For example, the paging poll information includes i) information informing that a paging request is needed for a first paging group and ii) information informing that a paging request is not needed for a second paging group.

[0344] For example, the operations further comprise: initiating transmission of the paging request including information related to the paging group of the wireless device, based on that the wireless device belongs to the first paging group.

[0345] For example, the paging request includes a random access preamble.

[0346] For example, the operations further comprise: monitoring a random access response, after transmitting the paging request; and considering that the paging request is successfully completed upon receiving the random access response.

[0347] For example, the operations further comprise: selecting a random access resource corresponding to the paging group of the wireless device, wherein the random access preamble is transmitted based on the selected random access resource.

[0348] For example, the operations further comprise: determining a paging sub-group of the wireless device; and transmitting, to the network, a paging request including information related to the paging sub-group of the wireless device.

[0349] For example, the stored a plurality of instructions may cause the wireless device to be in communication with at least one of a user equipment, a network, or an autonomous vehicle other than the wireless device.

[0350] Hereinafter, a method performed by a base station (BS) for on-demand paging, according to some embodiments of the present disclosure, will be described.

[0351] The method comprises: transmitting, by a network to the wireless device, a configuration for a paging request; receiving, by the network from the wireless device, a paging request including information related to the paging group of the wireless device; and providing, by the network to the wireless device, a paging message for the paging group.

[0352] Hereinafter, a base station (BS) for on-demand paging, according to some embodiments of the present disclosure, will be described.

[0353] The BS may include a transceiver, a memory, and a processor operatively coupled to the transceiver and the memory.

[0354] The processor may be adapted to control the transceiver to perform operations.

[0355] The operations comprise: transmitting, to the wireless device, a configuration for a paging request; receiving, from the wireless device, a paging request including information related to the paging group of the wireless device; and providing, to the wireless device, a paging message for the paging group.

[0356] The present disclosure can have various advantageous effects.

[0357] According to some embodiments of the present disclosure, the wireless device could efficiently perform on-demand paging procedure.

[0358] For example, network can save its power and radio resource by not transmitting the paging information for a specific paging group / sub-group which has not requested the paging transmission.

[0359] For example, although the UE power consumption slightly increases due to the requirement to send MSG1 for the paging request, the power saving resulting from the reduction in false alarms received by UE can somewhat compensate for this.

[0360] For example, by performing a paging request per paging group, the wireless device could obtain a higher NES gain than a paging request per wireless device.

[0361] According to some embodiments of the present disclosure, the wireless communication system could provide an efficient solution for on-demand paging.

[0362] Advantageous effects which can be obtained through specific embodiments of the present disclosure are not limited to the advantageous effects listed above. For example, there may be a variety of technical effects that a person having ordinary skill in the related art can understand and / or derive from the present disclosure. Accordingly, the specific effects of the present disclosure are not limited to those explicitly described herein, but may include various effects that may be understood or derived from the technical features of the present disclosure.

[0363] Claims in the present disclosure can be combined in a various way. For instance, technical features in method claims of the present disclosure can be combined to be implemented or performed in an apparatus, and technical features in apparatus claims can be combined to be implemented or performed in a method. Further, technical features in method claim(s) and apparatus claim(s) can be combined to be implemented or performed in an apparatus. Further, technical features in method claim(s) and apparatus claim(s) can be combined to be implemented or performed in a method. Other implementations are within the scope of the following claims.

Claims

1.A method, comprising:determining, by a wireless device, a paging group of the wireless device;receiving, by the wireless device from a network, a configuration for a paging request;transmitting, by the wireless device to the network, a paging request including information related to the paging group of the wireless device; andmonitoring, by the wireless device, a paging occasion.2.The method of claim 1,wherein the paging request includes a request for a paging message for one or more wireless devices included in the paging group.3.The method of claim 1, wherein the method further comprising:receiving, by the wireless device from the network, paging poll information.4.The method of claim 3,wherein the paging poll information informs whether a paging request for paging transmission from the network is needed or not.5.The method of claim 3, wherein the method further comprising:determining, by the wireless device, whether to transmit the paging request to the network, based on the paging poll information.6.The method of claim 3,wherein the paging poll information is included in a paging early indication.7.The method of claim 3,wherein the paging poll information is transmitted per paging group.8.The method of claim 3,wherein the paging poll information includes i) information informing that a paging request is needed for a first paging group and ii) information informing that a paging request is not needed for a second paging group.9.The method of claim 8, wherein the method further comprising:initiating, by the wireless device, transmission of the paging request including information related to the paging group of the wireless device, based on that the wireless device belongs to the first paging group.10.The method of claim 1,wherein the paging request includes a random access preamble.11.The method of claim 10, wherein the method further comprising:monitoring, by the wireless device, a random access response, after transmitting the paging request; andconsidering, by the wireless device, that the paging request is successfully completed upon receiving the random access response.12.The method of claim 10, wherein the method further comprising:selecting, by the wireless device, a random access resource corresponding to the paging group of the wireless device,wherein the random access preamble is transmitted based on the selected random access resource.13.The method of claim 1, wherein the method further comprising:determining, by a wireless device, a paging sub-group of the wireless device; andtransmitting, by the wireless device to the network, a paging request including information related to the paging sub-group of the wireless device.14.The method of claim 1,wherein the wireless device is in communication with at least one of a user equipment, a network, or an autonomous vehicle other than the wireless device.15.A wireless device, comprising:at least one transceiver;at least one processor; andat least one memory operably connectable to the at least one processor and storing instructions that, based on being executed by the at least one processor, perform operations comprising:determining a paging group of the wireless device;receiving, from a network, a configuration for a paging request;transmitting, to the network, a paging request including information related to the paging group of the wireless device; andmonitoring a paging occasion.16.The wireless device of claim 15,wherein the paging request includes a request for a paging message for one or more wireless devices included in the paging group.17.The wireless device of claim 15, wherein the operations further comprising:receiving, from the network, paging poll information.18.The wireless device of claim 17,wherein the paging poll information informs whether a paging request for paging transmission from the network is needed or not.19.The wireless device of claim 17, wherein the operations further comprising:determining whether to transmit the paging request to the network, based on the paging poll information.20.The wireless device of claim 17,wherein the paging poll information is included in a paging early indication.21.The wireless device of claim 17,wherein the paging poll information is transmitted per paging group.22.The wireless device of claim 17,wherein the paging poll information includes i) information informing that a paging request is needed for a first paging group and ii) information informing that a paging request is not needed for a second paging group.23.The wireless device of claim 22, wherein the operations further comprising:initiating transmission of the paging request including information related to the paging group of the wireless device, based on that the wireless device belongs to the first paging group.24.The wireless device of claim 15,wherein the paging request includes a random access preamble.25.The wireless device of claim 24, wherein the operations further comprising:monitoring a random access response, after transmitting the paging request; andconsidering that the paging request is successfully completed upon receiving the random access response.26.The wireless device of claim 24, wherein the operations further comprising:selecting a random access resource corresponding to the paging group of the wireless device,wherein the random access preamble is transmitted based on the selected random access resource.27.The wireless device of claim 15, wherein the operations further comprising:determining a paging sub-group of the wireless device; andtransmitting, to the network, a paging request including information related to the paging sub-group of the wireless device.28.The wireless device of claim 15,wherein the wireless device is in communication with at least one of a user equipment, a network, or an autonomous vehicle other than the wireless device.29.A processor for a wireless device in a wireless communication system, wherein the processor is adapted to control the wireless device to perform operations comprising:determining a paging group of the wireless device;receiving, from a network, a configuration for a paging request;transmitting, to the network, a paging request including information related to the paging group of the wireless device; andmonitoring a paging occasion.30.A non-transitory computer-readable medium having stored thereon a plurality of instructions, which, when executed by a processor of a wireless device, cause the wireless device to perform operations, the operations comprising:determining a paging group of the wireless device;receiving, from a network, a configuration for a paging request;transmitting, to the network, a paging request including information related to the paging group of the wireless device; andmonitoring a paging occasion.31.A method, the method comprising,transmitting, by a network to the wireless device, a configuration for a paging request;receiving, by the network from the wireless device, a paging request including information related to the paging group of the wireless device; andproviding, by the network to the wireless device, a paging message for the paging group.32.A base station, comprising:a transceiver;a memory; andat least one processor operatively coupled to the transceiver and the memory, and adapted to perform operations, the operations comprising:transmitting, to the wireless device, a configuration for a paging request;receiving, from the wireless device, a paging request including information related to the paging group of the wireless device; andproviding, to the wireless device, a paging message for the paging group.

Images