CN117296367A - Measurement in NTN communication - Google Patents
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Abstract
One disclosure of the present specification provides a method for a User Equipment (UE) to perform non-terrestrial network (NTN) communication. The method comprises the following steps: receiving a synchronization signal from a network; receiving system information related to NTN from a network based on the UE connecting to a base station via an NTN satellite; transmitting a Random Access Channel (RACH) to the network; receiving a Random Access (RA) response message from the network; receiving measurement information from a network, wherein the measurement information includes information about a measurement time point of measurement of the UE; determining a measurable point in time when an elevation angle of the target satellite exceeds a threshold value based on orbit information of the target satellite; based on the measurement time point being earlier than the measurable point in time, sending a failure message to the network; and performing the measurement at a measurable point in time.
Description
Technical Field
The present description relates to mobile communications.
Background
Third generation partnership project (3 GPP) Long Term Evolution (LTE) is a technology for implementing high-speed packet communication. Many schemes have been proposed for LTE targets, including those aimed at reducing user and provider costs, improving quality of service, and extending and improving coverage and system capacity. The 3GPP LTE requires reduced cost per bit, increased service availability, flexible use of frequency bands, simple structure, open interface, and proper power consumption of the terminal as upper layer requirements.
Work has begun in the International Telecommunications Union (ITU) and 3GPP to develop requirements and specifications for New Radio (NR) systems. The 3GPP must identify and develop the technical components required to successfully standardize the new RAT in time to meet the emergency market needs, and the ITU radio communications sector (ITU-R) International Mobile Telecommunications (IMT) -2020 procedure puts longer-term demands. Furthermore, NR should be able to use any spectrum band at least up to 100GHz, even in the further future NR may be used for wireless communication.
The NR goal is to address a single technical framework of all usage scenarios, requirements and deployment scenarios, including enhanced mobile broadband (emmbb), large-scale machine type communication (emtc), ultra-reliable low latency communication (URLLC), etc. NR should have inherent forward compatibility.
Disclosure of Invention
Technical problem
In NTN communication, a method for measuring the elevation angle of a target satellite needs to be considered.
Technical proposal
Allowing the terminal to measure when the target satellite is above a certain altitude.
Advantageous effects
The present specification may have various effects.
For example, through the procedure disclosed in the present specification, the target satellite can be efficiently measured using elevation angle information, thereby preventing system performance from being degraded and saving terminal power.
The effects that can be obtained by the specific examples of the present specification are not limited to the effects listed above. For example, various technical effects may exist that one of ordinary skill in the relevant art may understand or derive. Thus, the specific effects of the present specification are not limited to those explicitly described herein, and may include various effects that can be understood or derived from the technical features of the present specification.
Drawings
Fig. 1 illustrates an example of a communication system to which an implementation of the present disclosure is applied.
Fig. 2 illustrates an example of a wireless device employing an implementation of the present disclosure.
Fig. 3 illustrates an example of a wireless device employing an implementation of the present disclosure.
Fig. 4 shows an example of a UE to which an implementation of the present disclosure is applied.
Fig. 5a to 5c are exemplary diagrams illustrating an exemplary architecture of a service for next generation mobile communication.
Fig. 6 shows an example of subframe types in NR.
Fig. 7 is an exemplary diagram showing an example of SS blocks in NR.
Fig. 8 is an exemplary diagram showing an example of beam scanning in NR.
Fig. 9 shows an example of an initial access procedure for NTN communication according to an embodiment of the present specification.
Fig. 10 is an exemplary diagram illustrating an example of NTN.
Fig. 11 shows an example of satellite elevation angle.
Fig. 11 shows an example of case 1.
Fig. 12 shows an example of case 1.
Fig. 13 shows an example of case 2.
Fig. 14 shows an example of case 3.
Fig. 15 shows a procedure of a UE according to the disclosure of the present specification.
Detailed Description
The following techniques, apparatuses and systems may be applied to various wireless multiple access systems. Examples of multiple-access systems include Code Division Multiple Access (CDMA) systems, frequency Division Multiple Access (FDMA) systems, time Division Multiple Access (TDMA) systems, orthogonal Frequency Division Multiple Access (OFDMA) systems, single carrier frequency division multiple access (SC-FDMA) systems, and multiple carrier frequency division multiple access (MC-FDMA) systems. CDMA may be embodied by a radio technology such as Universal Terrestrial Radio Access (UTRA) or CDMA 2000. TDMA may be implemented by radio technologies such as global system for mobile communications (GSM), general Packet Radio Service (GPRS), or enhanced data rates for GSM evolution (EDGE). OFDMA may be implemented by radio technologies such as Institute of Electrical and Electronics Engineers (IEEE) 802.11 (Wi-Fi), IEEE 802.16 (Wi MAX), IEEE 802.20, or evolved UTRA (E-UTRA). UTRA is part of Universal Mobile Telecommunications System (UMTS). The third generation partnership project (3 GPP) Long Term Evolution (LTE) is part of evolved UMTS (E-UMTS) that uses E-UTRA. 3GPP LTE employs OFDMA in DL and SC-FDMA in UL. The evolution of 3GPP LTE includes LTE-A (advanced), LTE-A Pro and/or 5G NR (New radio).
For ease of description, implementations of the present disclosure are described primarily with respect to 3 GPP-based wireless communication systems. However, 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 3 GPP-based wireless communication system, aspects of the present disclosure are not limited to the 3 GPP-based wireless communication system and are applicable to other mobile communication systems.
For terms and techniques not specifically described in terms and techniques employed in the present disclosure, reference may be made to a wireless communication standard document published before the present disclosure.
In this disclosure, "a or B" may mean "a only", "B only", 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 represent "a only", "B only", "C only" or any combination of "A, B and C".
In this disclosure, a slash (/) or comma (,) may represent "and/or". For example, "A/B" may mean "A and/or B". Thus, "a/B" may mean "a only", "B only" or "both a and B". For example, "A, B, C" may represent "A, B or C".
In the present disclosure, "at least one of a and B" may mean "a only", "B only", or "both a and B". Furthermore, 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 being the same as "at least one of a and B".
Further, in the present disclosure, at least one of "A, B and C" may represent "a only", "B only", "C only", or any combination of "A, B and C". In addition, "at least one of A, B or C" or "A, B and/or at least one of C" may mean "at least one of A, B and C".
In addition, brackets used in this disclosure may represent "for example". Specifically, when it is displayed as "control information (PDCCH)", the "PDCCH" may be proposed as an example of the "control information". In other words, the "control information" in the present disclosure is not limited to the "PDCCH", and the "PDCCH" may be proposed as an example of the "control information". Further, even when shown as "control information (i.e., PDCCH)", the "PDCCH" may be proposed as an example of the "control information".
Features that are separately described in one drawing of the present disclosure may be implemented separately or simultaneously.
Although not limited thereto, the various descriptions, functions, procedures, suggestions, methods and/or operational flowcharts of the present disclosure disclosed herein may be applied to various fields that require wireless communication and/or connection (e.g., 5G) between devices.
Hereinafter, the present disclosure will be described in more detail with reference to the accompanying drawings. Unless otherwise indicated, like reference numerals in the following figures and/or descriptions may refer to like and/or corresponding hardware, software, and/or functional blocks.
Fig. 1 illustrates an example of a communication system to which an implementation of the present disclosure is applied.
The 5G usage scenario shown in fig. 1 is merely exemplary, and the technical features of the present disclosure may be applied to other 5G usage scenarios not shown in fig. 1.
Three main demand categories of 5G include (1) the category of enhanced mobile broadband (emmbb), (2) the category of large-scale machine type communication (mctc), and (3) the category of Ultra Reliable Low Latency Communication (URLLC).
Referring to fig. 1, a communication system 1 includes wireless devices 100a to 100f, a Base Station (BS) 200, and a network 300. Although fig. 1 shows a 5G network as an example of a network of the communication system 1, embodiments of the present disclosure are not limited to a 5G system, and may be applied to future communication systems beyond a 5G system.
BS200 and network 300 may be implemented as wireless devices and a particular wireless device may operate as a BS/network node relative to other wireless devices.
Wireless devices 100 a-100 f represent devices that perform communications using a Radio Access Technology (RAT) (e.g., 5G New RAT (NR)) or LTE, and may be referred to as communication/radio/5G devices. Wireless devices 100 a-100 f may include, but are not limited to, robots 100a, vehicles 100b-1 and 100b-2, augmented reality (XR) devices 100c, handheld devices 100d, home appliances 100e, ioT devices 100f, and Artificial Intelligence (AI) devices/servers 400. For example, the vehicles may include vehicles having wireless communication functions, autonomous driving vehicles, and vehicles capable of performing communication between vehicles. The vehicle may include an Unmanned Aerial Vehicle (UAV) (e.g., an unmanned aerial vehicle). The XR device may comprise an AR/VR/Mixed Reality (MR) device, and may be implemented in the form of a head-mounted device (HMD), head-up display (HUD) mounted in a vehicle, television, smart phone, computer, wearable device, home appliance device, digital signage, vehicle, robot, or the like. Handheld devices may include smart phones, smart tablets, wearable devices (e.g., smart watches or smart glasses), and computers (e.g., notebooks). Home appliances may include televisions, refrigerators, and washing machines. IoT devices may include sensors and smart meters.
In this disclosure, the wireless devices 100a through 100f may be referred to as User Equipment (UE). The UE may include, for example, a cellular phone, a smart phone, a laptop computer, a digital broadcast terminal, a Personal Digital Assistant (PDA), a Portable Multimedia Player (PMP), a navigation system, a tablet Personal Computer (PC), a tablet PC, a super-host, a vehicle with autonomous driving functions, a connected car, a UAV, an AI module, a robot, an AR device, a VR device, an MR device, a holographic device, a public safety device, an MTC device, an IoT device, a medical device, a financial technology device (or financial device), a security device, a weather/environmental device, a device related to 5G services, or a device related to the fourth industrial revolution field.
The UAV may be, for example, an aircraft associated with wireless control signals, without a man.
VR devices may include, for example, devices for implementing objects or contexts of a virtual world. AR devices may include devices implemented, for example, by connecting a virtual world object or context to a real world object or context. MR devices may comprise devices implemented, for example, by incorporating virtual world objects or backgrounds into real world objects or backgrounds. The hologram device may include, for example, a device for realizing a 360-degree stereoscopic image by recording and reproducing stereoscopic information, which uses an interference phenomenon of light generated when two lasers called holograms meet.
The public safety device may comprise, for example, an image relay device or an image device that is wearable on the body of the user.
MTC devices and IoT devices may be devices that do not require direct human intervention or manipulation, for example. For example, MTC devices and IoT devices may include smart meters, vending machines, thermometers, smart light bulbs, door locks, or various sensors.
The medical device may be, for example, a device for diagnosing, treating, alleviating, curing or preventing a disease. For example, the medical device may be a device for diagnosing, treating, alleviating or correcting a lesion or injury. For example, the medical device may be a device for inspecting, replacing or modifying a structure or function. For example, the medical device may be a device for regulating pregnancy. For example, the medical device may comprise a device for therapy, a device for operation, a device for (in vitro) diagnosis, a hearing aid or a device for surgery.
The safety device may be, for example, a device that is mounted to prevent possible hazards and to remain safe. For example, the security device may be a camera, a Closed Circuit TV (CCTV), a recorder, or a black box.
The financial and technological device may be, for example, a device capable of providing financial services such as mobile payment. For example, the financial and scientific device may include a payment device or a point of sale (POS) system.
The weather/environment means may comprise, for example, means for monitoring or predicting the weather/environment.
The wireless devices 100a to 100f may connect to the network 300 via the BS 200. 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 super 5G network. Although the wireless devices 100a to 100f may communicate with each other through the BS 200/network 300, the wireless devices 100a to 100f may perform direct communication (e.g., side-uplink communication) with each other without passing through the BS 200/network 300. For example, the vehicles 100b-1 and 100b-2 may perform direct communications (e.g., vehicle-to-vehicle (V2V)/vehicle-to-everything (V2X) communications). An IoT device (e.g., a sensor) may perform direct communication with other IoT devices (e.g., sensors) or other wireless devices 100 a-100 f.
Wireless communications/connections 150a, 150b, and 150c may be established between wireless devices 100 a-100 f and/or between wireless devices 100 a-100 f and BS200 and/or between BS 200. Herein, wireless communications/connections may be established over various RATs (e.g., 5G NR), such as uplink/downlink communications 150a, side-link communications (or device-to-device (D2D) communications) 150b, inter-base station communications 150c (e.g., relay, integrated Access and Backhaul (IAB)), and so on. The wireless devices 100a to 100f and the BS 200/wireless devices 100a to 100f may transmit/receive radio signals to/from each other through the wireless communication/connection 150a, 150b, and 150c. For example, the wireless communication/connections 150a, 150b, and 150c may transmit/receive signals over various physical channels. To this end, at least a part of various configuration information configuration procedures, various signal processing procedures (e.g., channel coding/decoding, modulation/demodulation, and resource mapping/demapping) and resource allocation procedures for transmitting/receiving radio signals may be performed based on various suggestions of the present disclosure.
AI refers to a field of research artificial intelligence or a method of creating AI, and machine learning is a field of designating various problems solved in the field of definition AI and a method field of solving them. Machine learning is also defined as an algorithm that improves the performance of a task by a steady experience of the task.
Robots refer to machines that automatically process or operate a given task by their own capabilities. In particular, robots that have the ability to recognize environments and self-determine to perform actions may be referred to as intelligent robots. Robots may be classified into industry, medical, home, military, etc. according to use or field of use. The robot may perform various actual operations, such as moving a robot joint with an actuator or a motor. The mobile robot also comprises wheels, brakes, propellers, etc. on the drive, allowing it to travel on the ground or fly in the air.
Autonomous driving refers to the technique of self-driving, and an autonomous vehicle means a vehicle that is driven without control of a user or under control of a minimum user. For example, autonomous driving may include maintaining a lane in motion, automatically adjusting speed, such as adaptive cruise control, automatic driving along a set route, and automatically setting a route when a destination is set. Vehicles cover vehicles equipped with an internal combustion engine, hybrid vehicles equipped with an internal combustion engine and an electric motor, and electric vehicles equipped with an electric motor, and may include trains, motorcycles, and the like, as well as automobiles. An autonomous vehicle may be considered a robot with autonomous driving functions.
Augmented reality is collectively referred to as VR, AR, and MR. VR technology provides objects and real world background solely through Computer Graphics (CG) images. AR technology provides a virtual CG image on top of a real object image. MR technology is CG technology that combines virtual objects into the real world. MR technology is similar to AR technology in that they together display real and virtual objects. However, there is a difference in AR technology in which a virtual object is used as a complementary form of a real object, whereas in MR technology, a virtual object and a real object are used as equal personalities.
The NR supports multiple parameter sets (and/or multiple subcarrier spacings (SCS)) to support various 5G services. For example, if the SCS is 15kHz, then wide area can be supported in the legacy cellular band, and if the SCS is 30kHz/60kHz, then dense cities, lower latency, and wider carrier bandwidth can be supported. If the SCS is 60kHz or higher, a bandwidth of greater than 24.25GHz can be supported to overcome phase noise.
The NR frequency bands can be defined as two types of frequency ranges, FR1 and FR2. The values of the frequency ranges may vary. For example, the frequency ranges of the two types (FR 1 and FR 2) may be as shown in table 1. For ease of explanation, in the frequency range used in the NR system, FR1 may represent "sub-6 GHz range", FR2 may represent "higher than 6GHz range", and may be referred to as millimeter wave (mmW).
TABLE 1
| Frequency range assignment | Corresponding frequency range | Subcarrier spacing |
| FR1 | 450MHz-6000MHz | 15、30kHz、60kHz |
| FR2 | 24250MHz-52600MHz | 60、120、240kHz |
As described above, the value of the frequency range of the NR system can be changed. For example, FR1 may include a frequency band of 410MHz to 7125MHz as shown in table 2 below. That is, FR1 may include a frequency band of 6GHz (or 5850, 5900, 5925MHz, etc.) or higher. For example, 6GHz (or 5850, 5900, 5925MHz, etc.) or more bands included in FR1 may include unlicensed bands. The unlicensed frequency band may be used for various purposes, such as for communication of vehicles (e.g., autonomous driving).
TABLE 2
| Frequency range assignment | Corresponding frequency range | Subcarrier spacing |
| FR1 | 410MHz-7125MHz | 15、30kHz、60kHz |
| FR2 | 24250MHz-52600MHz | 60、120、240kHz |
Here, radio communication techniques implemented in wireless devices in the present disclosure may include narrowband internet of things (NB-Io T) 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 names. Additionally and/or alternatively, radio communication techniques implemented in wireless devices in the present disclosure may communicate based on LTE-M techniques. For example, LTE-M technology may be an example of LPWAN technology, and may be referred to by various names such as enhanced machine type communication (eMTC). For example, LTE-M technology may be implemented in at least one of 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 communications, and/or 7) LTE M, and may not be limited to the above names. Additionally and/or alternatively, radio communication techniques implemented in a wireless device in the present disclosure may include at least one of ZigBee, bluetooth, and/or LPWAN that allows for low power communications, and may not be limited to the above names. For example, zigBee technology may generate Personal Area Networks (PANs) associated with small/low power digital communications based on various specifications, such as IEEE 802.15.4, and may be referred to by various names.
Fig. 2 illustrates an example of a wireless device employing an implementation of the present disclosure.
Referring to fig. 2, the first wireless device 100 and the second wireless device 200 may transmit/receive radio signals to/from external devices through various RATs (e.g., LTE and NR).
In fig. 2, { first wireless device 100 and second wireless device 200} may correspond to at least one of { wireless devices 100a to 100f and BS200}, { wireless devices 100a to 100f and wireless devices 100a to 100f } and/or { BS200 and BS200} of fig. 1.
The first wireless device 100 may include at least one transceiver, such as transceiver 106, at least one processing chip (such as processing chip 101), and/or one or more antennas 108.
The processing chip 101 may include at least one processor, such as processor 102, and at least one memory, such as memory 104. Memory 104 is illustratively shown in fig. 2 as being included in processing chip 101. Additionally and/or alternatively, the memory 104 may be placed external to the processing chip 101.
The processor 102 may control the memory 104 and/or the transceiver 106 and may be configured to implement the descriptions, functions, procedures, suggestions, methods, and/or operational flowcharts described in this disclosure. For example, the processor 102 may process the information within the memory 104 to generate first information/signals and then transmit radio signals including the first information/signals through the transceiver 106. The processor 102 may receive a radio signal including the second information/signal through the transceiver 106 and then store information obtained by processing the second information/signal in the memory 104.
The memory 104 may be operatively connected to the processor 102. Memory 104 may store various types of information and/or instructions. The memory 104 may store software code 105 implementing instructions that, when executed by the processor 102, perform the descriptions, functions, procedures, suggestions, methods, and/or operational flowcharts disclosed in this 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 execute one or more protocols. For example, the software code 105 may control the processor 102 to execute one or more layers of a radio interface protocol.
Herein, the processor 102 and the memory 104 may be part of a communication modem/circuit/chip designed to implement a RAT (e.g., LTE or NR). The transceiver 106 may be coupled to the processor 102 and transmit and/or receive radio signals via one or more antennas 108. Each of the transceivers 106 may include a transmitter and/or a receiver. The transceiver 106 may be used interchangeably with a Radio Frequency (RF) unit. In this disclosure, the first wireless device 100 may represent a communication modem/circuit/chip.
The second wireless device 200 may include at least one transceiver, such as transceiver 206, at least one processing chip (such as processing chip 201), and/or one or more antennas 208.
The processing chip 201 may include at least one processor, such as processor 202, and at least one memory, such as memory 204. Memory 204 is illustratively shown in fig. 2 as being included in processing chip 201. Additionally and/or alternatively, the memory 204 may be placed external to the processing chip 201.
The processor 202 may control the memory 204 and/or the transceiver 206 and may be configured to implement the descriptions, functions, procedures, suggestions, methods, and/or operational flowcharts described in this disclosure. For example, the processor 202 may process the information within the memory 204 to generate a third information/signal and then transmit a radio signal including the third information/signal through the transceiver 206. The processor 202 may receive a radio signal including the fourth information/signal via the transceiver 106 and then store information obtained by processing the fourth information/signal in the memory 204.
The memory 204 may be operatively connected to the processor 202. Memory 204 may store various types of information and/or instructions. Memory 204 may store software code 205 that implements instructions that, when executed by processor 202, perform the descriptions, functions, procedures, suggestions, methods, and/or operational flowcharts disclosed in this disclosure. For example, software code 205 may implement instructions that when executed by processor 202 perform the descriptions, functions, procedures, suggestions, methods, and/or operational flowcharts disclosed in this disclosure. For example, software code 205 may control processor 202 to execute one or more protocols. For example, software code 205 may control processor 202 to execute one or more layers of a radio interface protocol.
Herein, the processor 202 and the memory 204 may be part of a communication modem/circuit/chip designed to implement a RAT (e.g., LTE or NR). The transceiver 206 may be coupled to the processor 202 and transmit and/or receive radio signals via one or more antennas 208. Each of the transceivers 206 may include a transmitter and/or a receiver. The transceiver 206 may be used interchangeably with RF units. In this disclosure, the second wireless device 200 may represent a communication modem/circuit/chip.
Hereinafter, hardware elements of the wireless devices 100 and 200 will be described in more detail. One or more protocol layers may be implemented by, but are not 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 a Physical (PHY) layer, a Medium Access Control (MAC) layer, a Radio Link Control (RLC) layer, a Packet Data Convergence Protocol (PDCP) layer, a Radio Resource Control (RRC) layer, and a Service Data Adaptation Protocol (SDAP) layer). In accordance with the descriptions, functions, procedures, suggestions, methods, and/or operational flow diagrams disclosed in this disclosure, one or more processors 102 and 202 may generate one or more Protocol Data Units (PDUs) and/or one or more Service Data Units (SDUs). One or more processors 102 and 202 may generate messages, control information, data, or information in accordance with the descriptions, functions, procedures, suggestions, methods, and/or operational flowcharts disclosed in this 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 signals (e.g., baseband signals) from the one or more transceivers 106 and 206 and obtain 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.
The one or more processors 102 and 202 may be referred to as a controller, microcontroller, microprocessor, or microcomputer. One or more of the 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. The descriptions, functions, procedures, suggestions, methods and/or operational flowcharts disclosed in this disclosure may be implemented using firmware or software, and the firmware or software may be configured to include modules, procedures or functions. Firmware or software configured to perform the descriptions, functions, procedures, suggestions, methods, and/or operational flow diagrams disclosed in this disclosure may be included in one or more processors 102 and 202 or stored in one or more memories 104 and 204 to be driven by one or more processors 102 and 202. The descriptions, functions, procedures, suggestions, methods and/or operational flowcharts disclosed in this disclosure may be implemented using firmware or software in the form of codes, commands and/or a set of commands.
One or more memories 104 and 204 may be coupled to one or more processors 102 and 202 and store various types of data, signals, messages, information, programs, code, instructions, and/or commands. One or more of the memories 104 and 204 may be configured by read-only memory (ROM), random-access memory (RAM), electrically erasable programmable read-only memory (EPROM), flash memory, a hard drive, registers, a cache, a computer-readable storage medium, and/or combinations thereof. The one or more memories 104 and 204 may be located internal and/or external to 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 by various techniques, such as a wired or wireless connection.
One or more transceivers 106 and 206 may transmit the user data, control information, and/or radio signals/channels mentioned in the descriptions, functions, procedures, suggestions, methods, and/or operational flowcharts disclosed in this disclosure to one or more other devices. One or more transceivers 106 and 206 may receive the user data, control information, and/or radio signals/channels mentioned in the descriptions, functions, procedures, suggestions, methods, and/or operational flowcharts disclosed in this disclosure from one or more other devices. For example, one or more transceivers 106 and 206 may be coupled to 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 such 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 such that the one or more transceivers 106 and 206 may receive user data, control information, or radio signals from one or more other devices.
One or more transceivers 106 and 206 may be connected to one or more antennas 108 and 208, and one or more transceivers 106 and 206 may be configured to transmit and receive the user data, control information, and/or radio signals/channels referred to in the descriptions, functions, procedures, suggestions, methods, and/or operational flowcharts disclosed in this disclosure through one or more antennas 108 and 208. In the present disclosure, one or more of antennas 108 and 208 may be multiple physical antennas or multiple logical antennas (e.g., antenna ports).
The one or more transceivers 106 and 206 may convert the received user data, control information, radio signals/channels, etc. from RF band signals to baseband signals using the one or more processors 102 and 202 to process the received user data, control information, radio signals/channels, etc. The one or more transceivers 106 and 206 may convert user data, control information, radio signals/channels, etc., processed using the one or more processors 102 and 202 from baseband signals to RF band signals. To this end, one or more of the transceivers 106 and 206 may comprise (analog) oscillators and/or filters. For example, the one or more transceivers 106 and 206 may up-convert the OFDM baseband signal to an OFDM signal through their (analog) oscillators and/or filters under the control of the one or more processors 102 and 202 and transmit the up-converted OFDM signal at a carrier frequency. The one or more transceivers 106 and 206 may receive the OFDM signal at a carrier frequency and down-convert the OFDM signal to an OFDM baseband signal through their (analog) oscillators and/or filters under the control of the one or more processors 102 and 202.
In embodiments of the present disclosure, a UE may operate as a transmitting device in the Uplink (UL) and a receiving device in the Downlink (DL). In an embodiment of the present disclosure, the BS may operate as a receiving device in UL and a transmitting device in DL. Hereinafter, for convenience of description, it is mainly assumed that the first wireless device 100 functions as a UE and the second wireless device 200 functions as a BS. For example, according to implementations of the present disclosure, the processor(s) 102 connected to the first wireless device 100, installed on the first wireless device 100, or initiated in the first wireless device 100 may be configured to perform UE actions, or control the transceiver 106 to perform UE actions according to implementations of the present disclosure. The processor 202 connected to the second wireless device 200, installed on the second wireless device 200, or initiated in the second wireless device 200 may be configured to perform BS behaviors according to implementations of the present disclosure or control the transceiver 206 to perform BS behaviors according to implementations of the present disclosure.
In the present disclosure, a BS is also referred to as a Node B (NB), an evolved node B (eNB), or a gNB.
Fig. 3 illustrates an example of a wireless device employing an implementation of the present disclosure.
A wireless device may be implemented in various forms according to use cases/services (refer to fig. 1).
Referring to fig. 3, wireless devices 100 and 200 may correspond to wireless devices 100 and 200 of fig. 2 and may be configured by various elements, assemblies, 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 an additional component 140. The communication unit 110 may include a communication circuit 112 and a transceiver 114. For example, the communication circuit 112 may include one or more processors 102 and 202 of fig. 2 and/or one or more memories 104 and 204 of fig. 2. For example, transceiver 114 may include one or more transceivers 106 and 206 of fig. 2 and/or one or more antennas 108 and 208 of fig. 2. The control unit 120 is electrically connected to the communication unit 110, the memory unit 130, and the additional components 140, and controls the overall operation of each of the wireless devices 100 and 200. For example, the control unit 120 may control the electrical/mechanical operation of each of the wireless devices 100 and 200 based on programs/codes/commands/information stored in the memory unit 130. The control unit 120 may transmit information stored in the memory unit 130 to the outside (e.g., other communication devices) through a wireless/wired interface via the communication unit 110, or store information received from the outside (e.g., other communication devices) through a wireless/wired interface in the memory unit 130 via the communication unit 110.
The add-on component 140 may be configured differently depending on the type of wireless devices 100 and 200. For example, the additional component 140 may include at least one of a power supply unit/battery, an input/output (I/O) unit (e.g., an audio I/O port, a video I/O port), a driving unit, and a computing unit. The wireless devices 100 and 200 may be implemented in the form of, but not limited to, robots (100 a of fig. 1), vehicles (100 b-1 and 100 b-2), XR devices (100 c of fig. 1), handheld devices (100 d of fig. 1), home appliances (100 e), ioT devices (100 f of fig. 1), digital broadcast terminals, hologram devices, public safety devices, MTC devices, medical devices, financial technology devices (or financial devices), security devices, climate/environmental devices, AI servers/devices (400 of fig. 1), BSs (200 of fig. 1), network nodes, etc. Wireless devices 100 and 200 may be used in mobile or stationary locations depending on the use case/service.
In fig. 3, the various elements, assemblies, units/portions and/or modules in wireless devices 100 and 200 may be connected to each other in their entirety by wired interfaces, or at least a portion thereof may be connected wirelessly by 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 a wire, and the control unit 120 and the first units (e.g., 130 and 140) may be wirelessly connected by the communication unit 110. Each element, component, unit/section, and/or module within wireless devices 100 and 200 may also 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 graphics processing unit, and a memory control processor. As another example, the memory unit 130 may be configured by RAM, DRAM, ROM, flash memory, volatile memory, non-volatile memory, and/or combinations thereof.
Fig. 4 shows an example of a UE to which an implementation of the present disclosure is applied.
Referring to fig. 4, the ue 100 may correspond to the first wireless device 100 of fig. 2 and/or the wireless device 100 or 200 of fig. 3.
UE 100 includes a processor 102, a memory 104, a transceiver 106, one or more antennas 108, a power management module 110, a battery 112, a display 114, a keypad 116, a Subscriber Identity Module (SIM) card 118, a speaker 120, and a microphone 122.
The processor 102 may be configured to implement the descriptions, functions, procedures, suggestions, methods, and/or operational flowcharts disclosed in this 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. The radio interface protocol layer may be implemented in the processor 102. The processor 102 may include an 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). Examples of processor 102 may be found in a processor such as Manufactured snapdagon TM Serial processor, by->Manufactured EXYNOS TM Serial processor, by->Manufactured A series processor, consists of +.>HELIO prepared by TM Serial processor, by->Manufactured ATOM TM Found in a series of processors or corresponding next generation processors.
Memory 104 is operably coupled to processor 102 and stores various information to operate processor 102. The memory 104 may include ROM, RAM, flash memory, memory cards, storage media, and/or other storage devices. When the embodiments are implemented in software, the techniques described herein may be implemented with modules (e.g., procedures, functions, and so on) that perform the descriptions, functions, procedures, suggestions, methods, and/or operational flow diagrams disclosed in this disclosure. These modules may be stored in the memory 104 and executed by the processor 102. The memory 104 may be implemented within the processor 102 or external to the processor 102, in which case they can be communicatively coupled to the processor 102 via various means as is known in the art.
Transceiver 106 is operably coupled to processor 102 and transmits and/or receives radio signals. 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 one or more antennas 108 to transmit and/or receive radio signals.
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.
The display 114 outputs results of processing by the processor 102. The keypad 116 receives input to be used by the processor 102. A keyboard 116 may be displayed on the display 114.
SIM card 118 is an integrated circuit intended to securely store an International Mobile Subscriber Identity (IMSI) number and its associated keys for identifying and authenticating subscribers on mobile telephone devices, such as mobile telephones and computers. Contact information may also be stored on many SIM cards.
Speaker 120 outputs sound correlation results that are processed by processor 102. Microphone 122 receives sound related inputs to be used by processor 102.
Fig. 5a to 5c are exemplary diagrams illustrating an exemplary architecture of a service for next generation mobile communication.
Referring to fig. 5a, the ue is connected to LTE/LTE-a based cells and NR based cells in a DC (dual connectivity) manner.
The NR based cells are connected to a core network for existing 4G mobile communications, i.e. the NR based cells are connected to an Evolved Packet Core (EPC).
Referring to fig. 5b, unlike fig. 6a, the LTE/LTE-a based cell is connected to a core network for 5G mobile communication, i.e., the LTE/LTE-a based cell is connected to a Next Generation (NG) core network.
The service method based on the architecture shown in fig. 5a and 5b is called NSA (non-independent).
Referring to fig. 5c, the ue is connected only to NR based cells. The service method based on this architecture is called SA (independent).
Meanwhile, in NR, reception from a base station can be considered to use a downlink subframe, and transmission to the base station uses an uplink subframe. The method may be applied to paired and unpaired spectrum. A pair of spectrum is meant to include two carrier spectrum for downlink and uplink operation. For example, in a pair of spectrums, one carrier may include a downlink band and an uplink band paired with each other.
Fig. 6 shows an example of subframe types in NR.
The TTI (transmission time interval) shown in fig. 6 may be referred to as a subframe or slot for NR (or new RAT). The subframes (or slots) of fig. 6 may be used in a TDD system of NR (or new RAT) to minimize data transmission delay. As shown in fig. 6, a subframe (or slot) includes 14 symbols, such as a current subframe. The front symbols of a subframe (or slot) may be used for a DL control channel and the rear symbols of a subframe (or slot) may be used for a UL control channel. The remaining symbols may be used for DL data transmission or UL data transmission. According to the subframe (or slot) structure, downlink transmission and uplink transmission may be sequentially performed in one subframe (or slot). Accordingly, downlink data may be received within a subframe (or time slot), and an uplink acknowledgement (ACK/NACK) may be transmitted within the subframe (or time slot). The structure of such subframes (or slots) may be referred to as self-contained subframes (or slots). When such a structure of subframes (or slots) is used, the time taken for receiving erroneous data is reduced, so that the final data transmission delay can be minimized. In such a self-contained subframe (or slot) structure, a time gap from a transmit mode to a receive mode or from a receive mode to a transmit mode may be required during the transition. For this, some OFDM symbols when switching from DL to UL in the subframe structure may be set as a Guard Period (GP).
< support of various parameter sets >
In the next generation system, as wireless communication technology advances, a plurality of parameter sets may be provided to the UE.
The parameter set may be defined by a length of a Cyclic Prefix (CP) and a subcarrier spacing. One cell may provide multiple parameter sets to the UE. When the index of the parameter set is denoted by μ, the subcarrier spacing and the corresponding CP length may be expressed as follows:
TABLE 3
| μ | Δf＝2μ·15[kHz] | CP |
| 0 | 15 | Normal state |
| 1 | 30 | Normal state |
| 2 | 60 | Normal, extended |
| 3 | 120 | Normal state |
| 4 | 240 | Normal state |
In the case of the normal CP, when the index of the parameter set is represented by μ, the number of OLDM symbols (N slot symb ) Number of slots per frame (N frame,μ slot ) And the number of slots per subframe (N subfrmae,μ slot ) Expressed as shown in the following table.
TABLE 4
| μ | N slot symb | Nf rame,μ slot | N subfrmae,μ slot |
| 0 | 14 | 10 | 1 |
| 1 | 14 | 20 | 2 |
| 2 | 14 | 40 | 4 |
| 3 | 14 | 80 | 8 |
| 4 | 14 | 160 | 16 |
| 5 | 14 | 320 | 32 |
In the case of the extended CP, when the index of the parameter set is represented by μ, the number of OLDM symbols (N slot symb ) Number of slots per frame (N frame,μ slot ) And the number of slots per subframe (N subfrmae,μ slot ) Expressed as shown in the following table.
TABLE 5
| μ | N slot symb | Nf rame,μ slot | N subfrmae,μ slot |
| 2 | 12 | 40 | 4 |
Meanwhile, in the next generation mobile communication, each symbol within the symbols may be used as a downlink or an uplink, as shown in the following table. In the following table, the uplink is denoted by U, and the downlink is denoted by D. In the following table, X represents a symbol that can be flexibly used in uplink or downlink.
TABLE 6
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< NR to SS Block >
The SS block (SS/PBCH block: SSB) includes information required for initial access of the terminal in the 5G NR, i.e., a Physical Broadcast Channel (PBCH), including a Master Information Block (MIB) and synchronization signals (Synchronization Signal, SS) (PSS and SSs).
In addition, multiple SSBs may be bundled to define an SS burst, and multiple SS bursts may be bundled to define an SS burst set. Assuming that each SSB is beamformed in a particular direction, several SSBs in an SS burst set are designed to support terminals that exist in different directions, respectively.
Fig. 7 is an exemplary diagram showing an example of SS blocks in NR.
Referring to fig. 7, SS bursts are transmitted every predetermined period. Correspondingly, the terminal receives the SS block and performs cell detection and measurement.
Meanwhile, in 5G NR, beam scanning is performed for SS. This will be described with reference to fig. 8.
Fig. 8 is an exemplary diagram showing an example of beam scanning in NR.
The base station transmits each SS block in an SS burst while performing beam scanning according to time. In this case, several SS blocks in the SS burst set are transmitted to support terminals existing in different directions, respectively.
< non-terrestrial network >
A non-terrestrial network refers to a network or network segment that uses RF resources on a satellite (or UAS platform).
NTN provides two common scenarios for access to user devices: transparent payloads and regenerated payloads.
NTN is generally characterized by the following elements:
-one or several satellite gateways connecting a non-terrestrial network to a public data network
GEO satellites are fed by one or more satellite gateways deployed over a satellite target coverage (e.g., area or even large Liu Fugai). We assume that the UEs in the cell are served by only one satellite gateway.
-non GEO satellites continuously served by one or several satellite gateways at a time. The system ensures service and feeder link continuity between successive service satellite gateways of sufficient duration to continue mobility anchoring and handoff.
Feeder link or radio link between satellite gateway and satellite (or UAS platform)
-a traffic link or wireless link between the user equipment and the satellite (or UAS platform).
Satellite (or UAS platform) that can implement transparent or regenerative (on-board processing) payloads. The satellite (or UAS platform) generates beams that typically generate several beams over a given service area defined by its field of view. The coverage area of a beam is typically elliptical. The field of view of a satellite (or UAS platform) depends on the onboard antenna pattern and the minimum elevation angle.
Transparent payload: radio frequency filtering, frequency conversion and amplification. Thus, the waveform signal repeated by the payload is unchanged.
-regenerating the payload: radio frequency filtering, frequency conversion and amplification, demodulation/decoding, switching and/or routing, encoding/modulation. This effectively equates to having all or part of the base station functionality (e.g., gNB) on the satellite (or UAS platform).
-inter-satellite links (ISL) optionally in the case of satellite constellations. This would require a regenerated payload on the satellite. ISL can operate in the RF frequency or optical band.
The user equipment is served by satellites (or UAS platforms) within the target service area.
Table 7 shows the type of NTN.
TABLE 7
Typically, GEO satellites and UASs are used to provide continental, regional, or local services. Typically, the constellation of LEOs and MEOs is used to provide services in both the northern hemisphere and the southern hemisphere. In some cases, the constellation may even provide global coverage including polar regions. For the latter, this requires proper orbital tilt, adequate beam generation and inter-satellite links.
< non-terrestrial network >
Fig. 9 shows an example of an initial access procedure for NTN communication according to an embodiment of the present specification.
In the example of fig. 9, TN (GW) refers to an NTN base station. NTN (satellite) means NTN satellite.
A TN (GW) may transmit a synchronization signal to an NTN satellite, and the NTN satellite may transmit the synchronization signal to the UE.
A TN (GW) may transmit system information to an NTN satellite, which may transmit system information to a UE.
For reference, the system information may be obtained specifically as in the following examples.
Acquisition of System Information (SI) is described.
The System Information (SI) is divided into a Master Information Block (MIB) and a plurality of System Information Blocks (SIBs). Here:
the MIB has a period of 80ms, is always sent on the BCH, is repeated within 80ms, and includes the parameters required to obtain systemiformationblocktype 1 (SIB 1) from the cell;
SIB1 is transmitted on DL-SCH periodically and repeatedly. SIB1 contains information about availability and scheduling (e.g., periodicity, SI window size) of other SIBs. It also indicates whether these (i.e., other SIBs) are provided on a periodic broadcast basis or on demand. If other SIBs are provided on demand, SIB1 contains information for the terminal to perform SI request;
SIBs other than SIB1 are carried in the System Information (SI) message sent on the DL-SCH. Each SI message is sent within a periodically occurring time domain window (referred to as an SI window).
In the example of fig. 9, the system information may include information about satellite ephemeris information, common TA-related parameter information, and the effective duration of the related information or UL synchronization information.
The UE may transmit RACH (random access channel) to TN (GW), and TN (GW) may transmit RACH to NTN satellite. The UE may transmit an initial control message through the RACH.
A TN (GW) may send a Random Access (RA) response message to the NTN satellite, and the NTN satellite may send the RA response message to the UE.
After transmitting the RA response message, the TN (GW) may transmit data and/or control signals to the NTN satellite, and the NTN satellite may transmit data and/or control signals to the UE.
< problems to be solved by the disclosure of the present specification >
Fig. 10 is an exemplary diagram illustrating an example of NTN.
NR-based NTN (non-terrestrial network) communication is a method for efficiently providing a communication service to an area where terrestrial network service is not provided through satellites (geosynchronous satellite GEO, low orbit satellite LEO, etc.), as shown in fig. 10. In the case of transparent satellites, the satellites amplify signals transmitted from ground base stations (g NB-NTN gateways). And in the case of regenerative satellites, the satellites perform the functions of a terrestrial base station such as routing, encoding and decoding modulation. The NTN terminal functions as a GPS and periodically receives the position, time and velocity information of the NTN satellites.
Fig. 11 shows an example of satellite elevation angle.
Fig. 11 shows the satellite elevation angle of the target satellite (satellite 2). The terminal may need to measure the signal of the target satellite (satellite 2). At this time, the network may configure SMTC (SSB measurement time configuration) or MG (measurement gap) to the terminal to measure signals from adjacent or expected adjacent satellites. The terminal may measure the signal of the target satellite using SMTC or MG.
Typically, the terminal may measure the signal of the target satellite when the elevation angle of the target satellite is 10 degrees.
If the target satellite is at or below the horizon or the elevation angle of the target satellite is less than a certain angle (e.g., 10 degrees), the terminal may not be able to measure the signal of the target satellite.
However, if SMTC or MG is configured without considering the altitude of the target satellite, a problem may occur in that the terminal cannot measure the signal of the target satellite.
< disclosure of the present specification >
The disclosure described later in this specification may be implemented in one or more combinations (e.g., combinations including at least one of the following descriptions). Each of the figures represents an embodiment of the present disclosure, but the embodiments of the figures may also be implemented in combination with each other.
The description of the methods presented in the disclosure of this specification may include one or more combinations of operations/configurations/steps described below. The methods described below may be performed or used in combination or complementarily.
5G NR NTN (non-terrestrial network) was introduced to provide communication services using satellites. In the coverage hole of the existing ground network (TN). The satellite/aircraft comprises: transparent satellites/aircraft, like the repeaters in existing TNs, perform simple signal amplification, and regenerative satellites/aircraft can perform the role of ground base stations. Although this description assumes satellites, especially transparent satellites, this description may also apply to regenerative satellites or aerial vehicles.
A terminal receiving service from the NTN may need to measure reference signals of neighboring satellites when the satellites move or the terminal moves. At this time, the network must configure SMTC (SSB measurement time configuration) or MG (measurement gap) to measure signals from satellites adjacent to or expected to be adjacent to the terminal. However, depending on the type of information used (location of the terminal, delay) or the body (network or terminal), the starting point of the SMTC/MG and the operating procedure of the SMTC/MG associated with the terminal may vary.
In this specification, the specification proposes a terminal and network operation that can be used to prevent performance degradation, reduce complexity, and save power when the terminal needs to measure signals from surrounding satellites/beams. Before explaining the specific details, it should be noted that in the 5G NR NTN operation, the position information of the terminal using the GNSS and the orbit information of the satellite may be used, and the terminal may calculate the delay and the distance using the orbit information of the target satellite. In addition, for convenience, the present specification explains when specific information (e.g., the location of a terminal) can be used, and when it cannot be used, as in case 1, case 2, and case 3 below. However, the following may be a series of operation procedures depending on reporting capabilities of the terminal, or may be independent operations depending on future standards. In other words, each case is a separate environment depending on the terminal and network conditions and settings, and the proposed method can also be applied independently.
1. Case 1
Case 1 is a case where the terminal reports only delay information (delay difference between the current service satellite and the target satellite or delay difference between the target satellite and the terminal) to the network or the network does not know exactly the starting point of SMTC/MG.
In this case, since the network must configure the start point of SMTC/MG using only delay information of the terminal, an exact point of time may not be configured. For example, in fig. 10, the terminal may measure the signal of the satellite when the elevation angle of the satellite 2 is generally 10 degrees or more. However, when SMTC/MG points are configured considering only delay information, satellites may be lower than the horizon or the elevation angle of the satellites may be less than 10 degrees, and thus the terminal cannot measure signals from the satellites.
The above-described altitude angle of 10 degrees refers to a minimum altitude angle threshold value at which the terminal can measure the target satellite, and an altitude angle of 10 degrees is an example and the minimum altitude angle threshold value is not limited to 10 degrees. This applies not only to this case 1 but also to cases 2 to 4 described later.
If the network configures SMTC/MG at a time when satellite measurement is impossible, the terminal cannot measure a signal of a target satellite or receive data from a service satellite, and thus, performance degradation may occur or the terminal may attempt to perform nonsensical SSB reception. To prevent this problem, the terminal may attempt each of the following operations.
(1) Example 1
The terminal directly calculates a measurement point (e.g., a point having an altitude of 10 degrees) using orbit information of the satellite and attempting measurement. If the SMTC/MG or zone of the network notification is earlier than the measurement point, the terminal may report a message indicating that the measurement at that point is not possible or has failed. In addition, if measurement fails after attempting measurement at a directly calculated measurement point, the operation of embodiment 2 or 3 may be performed.
(2) Example 2
The terminal attempts to measure the satellite at the point in time of the network notification (when SMTC/MG is configured, or at a specific point in time of the network notification), and if the measurement of the satellite fails, the terminal may report and request to the network to reconfigure SMTC/MG.
(3) Example 3
The terminal attempts to measure at this point and if the measurement fails, the terminal may attempt to measure the satellite for a certain period of time instead of every MG/SMTC. At this time, the specific period may be adjusted to be faster or slower, such as an exponential backoff. In addition, it may be adjusted to a fixed period longer than the SMTC/MG period. As shown in fig. 11, the process may be patterned. The terminal may report a message informing that the measurement for the MG/SMTC point is skipped, a message reporting a measurement failure, and a message indicating that the measurement period will be adjusted in the future.
(4) Example 4
If the signal strength for the SMTC/MG duration reported by the terminal is below a certain threshold, or the network does not receive the terminal's report, the network determines that the terminal is not well visible to the satellite or is not visible and increases the SMTC/MG period.
The above-described embodiment 1, embodiment 2 and embodiment 3 are independent operations, not a series of sequential operations, and may be combined operations.
The following figures are prepared to explain specific examples of the present specification. Since names of specific devices or specific signals/messages/fields depicted in the drawings are provided as examples, technical features of the present specification are not limited to specific names used in the following drawings.
Fig. 12 shows an example of case 1.
If the network fails to configure the correct SMTC/MG starting point, the following operations i), ii) or iii) may be initiated).
i) The terminal can independently determine a measurement point (time) of the target satellite using orbit information of the satellite. The terminal may repeatedly determine the measurement point of the target satellite at a specific period of time of the network configuration.
ii) if the measurement fails after attempting to measure the target satellite, the terminal may report the failure to the network and request a reconfiguration of SMTC or MG.
iii) After attempting to measure the target satellite, the terminal may adjust the measurement period if the measurement fails. The terminal may attempt measurement for a specific period of time of the network configuration, and if the measurement fails, the terminal may adjust the measurement period.
If the network fails to configure the correct SMTC/MG starting point, the operation may be terminated.
2. Case 2
Case 2 is when the terminal reports the location information of the terminal to the network, or when the network knows the location of the terminal, which is the case when the network can calculate the point in time when the terminal is visible (e.g., the altitude of the target satellite reaches a threshold value, e.g., 10 degrees) from the location of the terminal (e.g., calculation considering the location of the target satellite and a specific point in the current service satellite area).
(1) Example 5
In this case, the network may configure the SMTC/MG for the terminal after calculating the start point of the SMTC/MG, taking into account the positions of all the terminals and satellites. The starting point may be, for example, a time that considers the time at which the target satellite reaches the point at which the altitude becomes a threshold (e.g., 10 degrees) and a delay.
Alternatively, since excessive load may occur on the network, the network may calculate the start point of SMTC/MG only for terminals (terminals judged to be located at the edge of the service area) whose signal strengths of the serving cells (satellites) are lower than a certain threshold, and then provide the start point of SMTC/MG to the terminals.
Alternatively, the network may calculate the location of a specific or random point at the edge of the service area and the location of the satellite and inform the unique terminal located in the corresponding area (cell) of the valid starting point of the SMTC.
Fig. 13 shows an example of case 2.
When the network directly uses the location information of the terminal, an operation described later may be initiated.
The starting point of SMTC or MG may be configured by considering the positions of all terminals (or terminals whose signal strengths are below a certain threshold) and the positions of satellites.
The operation may be terminated when the network directly uses the location information of the terminal.
3. Case 3
Case 3 is the case where the terminal reports delay information and predicts the time when measurement of the target satellite will be possible. The time at which it is predicted that the measurement of the target satellite will be possible may be the point at which the target satellite reaches the altitude becomes a threshold (e.g., 10 degrees), and the terminal may start SMTC/MG from that point.
(1) Example 6
The terminal may use the satellite orbit information provided by the network to calculate and report the time at which the measurement was made. The terminal may report 'measurement_report' to the network, which includes such information as { cellid=x, salellid=x2, measurement_time= [ y ] ms }. In this way, it is possible that the terminal may report the Measurement of the target satellite after a certain time (measurement_time).
Alternatively, the terminal may report an absolute time based on UTC (coordinated universal time/global time coordination) instead of a specific time.
Fig. 14 shows an example of case 3.
When the terminal reports a measurable point in time, the following operations may be initiated:
the terminal may report to the network the points at which measurements are possible.
The operation may be terminated when the terminal is able to report a possible point in time for the measurement.
4. Case 4
Case 4 is a case where the terminal calculates a measurement time (for example, a time when the altitude of the satellite to the satellite becomes a threshold (for example, 10 degrees)) at which the terminal is expected to be able to measure the target satellite, and reports delay difference information of the target satellite to the network in consideration of the measurement time.
(1) Example 7
The terminal may use the satellite orbit information provided by the network to calculate a measurable point (e.g., a point when the altitude of the satellite to the satellite becomes a threshold (e.g., 10 degrees)).
In order for the network to configure SMTC/MG, information such as the delay difference between the satellite and the terminal reported by the terminal may be required.
The terminal may report to the network the delay differences of satellites that have reached or approached the calculated measurable point.
Alternatively, the terminal may report the delay difference to the network only for nearby satellites that may be measured based on the calculated measurable points in time.
The terminal reporting may be done at the request of the network. Alternatively, the terminal may report to the network periodically. The terminal may calculate a delay difference using ephemeris information of satellites included in system information such as SIB and report the delay difference to the network. The terminal may calculate an elevation angle and a delay difference of the satellite using ephemeris information of the satellite and a terminal position derived by GNSS (global navigation satellite system). In addition, the ephemeris information of the satellite includes information about the position where the satellite will move in the future, so that it can be predicted how the elevation angle and delay difference of the satellite will change in the future.
In other words, the network may report delay differences from the terminal only for the measurable satellites and use the delay differences only for the measurable satellites to configure SMTC or MG in the terminal.
If the satellite arrives at a location where the terminal is able to measure the satellite signal, the terminal may report the delay difference to the network. That is, the terminal calculates a measurable time at which measurement of the predicted target satellite is possible, and the terminal may report the delay difference to the network at the measurable time. The terminal may report the delay differential to the network under a trigger condition that the target satellite arrives at a measurable location. Case 3 is a case where the terminal reports the measurable time to the network, and case 4 is a case where the terminal reports the delay difference to the network at the measurable time.
If the network does not receive a report of the delay difference of the terminal with respect to a specific satellite, the network may immediately recognize that measurement for the satellite is impossible and instruct the terminal to report the delay difference of surrounding satellites including the specific satellite after a specific time.
Cases 1 to 4 do not specify the mode of the terminal. The above-described operation can be applied regardless of the terminal mode.
Examples of specific implementations of this specification based on terminal mode may be:
for example, in case 1, when the terminal is in an idle mode or an inactive mode, the terminal may determine SMTC or MG measurement time and attempt measurement based on ephemeris information of satellites provided through SIBs and the position of the terminal acquired through the terminal GNSS. At this time, an operation may be performed to adjust the measurement timing to be periodic or aperiodic.
For example, in case 4, when the terminal is in connected mode, the network may request delay information between the terminal and surrounding satellites from the terminal to configure SMTC or MG. The terminal may calculate the time delay difference and elevation angle with surrounding satellites based on ephemeris information of satellites provided through SIB and terminal position acquired by terminal GNSS. At this time, the terminal may report delay information to the network only for satellites whose elevation angles are above a certain angle.
Fig. 15 shows a procedure of a UE according to the disclosure of the present specification.
The ue may receive a synchronization signal from the network.
The UE may receive system information related to NTN from the network based on the UE connecting to the network via an NTN satellite.
The ue may send RACH (random access channel) to the network.
The ue may receive an RA (random access) response message from the network.
The ue may receive measurement information from the network.
The measurement information may include information about a measurement point of measurement of the UE.
The ue may determine a measurable point in time at which the altitude of the target satellite exceeds a threshold based on the orbit information of the target satellite.
The ue may send a failure message to the network based on the measurement point being earlier than the measurable point.
The ue may perform the measurement at a measurable point.
The measurement information may include information about SMTC (SSB measurement timing configuration) or MG (measurement gap).
The measurement information may include information about a measurement period of measurement of the UE.
The UE may adjust the measurement period based on the UE failing to measure at the measurable point.
The UE may report the adjustment of the measurement period to the network.
The threshold may be 10 degrees.
Hereinafter, an apparatus for providing mobile communication according to some embodiments of the present specification will be described.
For example, the device may include a processor, a transceiver, and a memory.
For example, a processor may be configured to be operably coupled with a memory and a processor.
The processor performs operations comprising: receiving a synchronization signal from a network; receiving, from the network, system information related to NTN based on the UE connecting to the network via an NTN satellite; transmitting RACH (random access channel) to the network; receiving an RA (random access) response message from the network; receiving measurement information from the network, wherein the measurement information includes information about a measurement point of measurement of the UE; determining a measurable point in time at which the altitude of the target satellite exceeds a threshold based on orbit information of the target satellite; sending a failure message to the network based on the measurement point being earlier than the measurable point; and performing a measurement at the measurable point.
Hereinafter, a processor for providing NTN (non-terrestrial network) communication in a wireless communication system according to some embodiments of the present specification will be described.
The processor performs operations comprising: receiving a synchronization signal from a network; receiving, from the network, system information related to NTN based on the UE connecting to the network via an NTN satellite; transmitting RACH (random access channel) to the network; receiving an RA (random access) response message from the network; receiving measurement information from the network, wherein the measurement information includes information about a measurement point of measurement of the UE; determining a measurable point in time at which the altitude of the target satellite exceeds a threshold based on orbit information of the target satellite; sending a failure message to the network based on the measurement point being earlier than the measurable point; and performing a measurement at the measurable point.
Hereinafter, a non-transitory computer readable medium storing one or more instructions for providing mobile communication according to some embodiments of the present specification will be described.
According to some embodiments of the present disclosure, the technical features of the present disclosure may be directly implemented as hardware, software executed by a processor, or a combination of the two. For example, in wireless communications, the methods performed by the wireless device may be implemented in hardware, software, firmware, or any combination thereof. For example, the software may reside in RAM memory, flash memory, ROM memory, EPROM memory, EEPROM memory, registers, hard disk, a removable disk, a CD-ROM, or other storage medium.
Some examples of the storage medium are 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. As another example, the processor and the storage medium may reside as discrete components.
Computer readable media may include tangible and non-volatile computer readable storage media.
For example, the non-volatile computer-readable medium may include Random Access Memory (RAM), such as Synchronous Dynamic Random Access Memory (SDRAM), read-only memory (ROM), or non-volatile random access memory (NVRAM). Read-only memory (EEPROM), flash memory, magnetic or optical data storage media, or other medium that may be used to store instructions or data structures. The non-volatile computer readable medium may also include a combination of the above.
Furthermore, the methods described herein may be implemented, at least in part, by a computer-readable communication medium that carries or carries code in the form of instructions or data structures and that can be accessed, read, and/or executed by a computer.
According to some embodiments of the present disclosure, a non-transitory computer-readable medium has one or more instructions stored thereon. The stored one or more instructions may be executable by a processor of the UE.
The stored one or more instructions cause the processor to perform operations comprising: receiving a synchronization signal from a network; receiving system information related to NTN from a network based on the UE connecting to the network via an NTN satellite; transmitting RACH (random access channel) to the network; receiving an RA (random access) response message from the network; receiving measurement information from a network, wherein the measurement information includes information about a measured measurement point of a measurement of the UE; determining a measurable point in time at which an altitude of the target satellite exceeds a threshold value based on the orbit information of the target satellite; based on the measurement point being earlier than the measurable point, sending a failure message to the network; and performing the measurement at the measurable point.
The present specification may have various effects.
For example, through the procedure disclosed in the present specification, the target satellite can be efficiently measured using elevation angle information, thereby preventing system performance from being degraded and saving terminal power.
The effects that can be obtained by the specific examples of the present specification are not limited to the effects listed above. For example, various technical effects may exist that one of ordinary skill in the relevant art may understand or derive. Thus, the specific effects of the present specification are not limited to those explicitly described herein, and may include various effects that can be understood or derived from the technical features of the present specification.
The claims described herein may be combined in various ways. For example, the technical features of the method claims of the present specification may be implemented in combination as an apparatus, and the technical features of the apparatus claims of the present specification may be implemented in combination as a method. Furthermore, the technical features of the method claims of the present specification and the technical features of the apparatus claims may be combined to be implemented as an apparatus, and the technical features of the method claims and the technical features of the apparatus claims of the present specification may be combined and implemented as a method. Other embodiments are within the scope of the following claims.
Claims (12)
1. A method for performing NTN (non-terrestrial network) communication by a UE (user equipment), the method comprising:
receiving a synchronization signal from a network;
receiving, from the network, system information related to NTN based on the UE connecting to the network via an NTN satellite;
transmitting RACH (random access channel) to the network;
receiving an RA (random access) response message from the network;
the measurement information is received from the network,
wherein the measurement information includes information about a measurement point for measurement of the UE;
determining a measurable point in time at which an altitude of a target satellite exceeds a threshold based on orbit information of the target satellite;
sending a failure message to the network based on the measurement point being earlier than the measurable point; and
measurements are performed at the measurable points.
2. The method according to claim 1,
wherein the measurement information includes information about SMTC (SSB measurement timing configuration) or MG (measurement gap).
3. The method of claim 1, further comprising:
wherein the measurement information includes information about a measurement period for measurement of the UE,
the measurement period is adjusted based on the UE failing to measure at the measurable point.
4. A method according to claim 3, further comprising:
reporting the adjustment of the measurement period to the network.
5. The method according to claim 1,
wherein the threshold is 10 degrees.
6. A UE (user equipment) for performing NTN (non-terrestrial network) communication, comprising:
a transceiver; and
the processor may be configured to perform the steps of,
wherein the processor performs operations comprising:
receiving a synchronization signal from a network;
receiving, from the network, system information related to NTN based on the UE connecting to the network via an NTN satellite;
transmitting RACH (random access channel) to the network;
receiving an RA (random access) response message from the network;
the measurement information is received from the network,
wherein the measurement information includes information about a measurement point for measurement of the UE;
determining a measurable point in time at which an altitude of a target satellite exceeds a threshold based on orbit information of the target satellite;
sending a failure message to the network based on the measurement point being earlier than the measurable point; and
measurements are performed at the measurable points.
7. The UE of claim 6,
wherein the measurement information includes information about SMTC (SSB measurement timing configuration) or MG (measurement gap).
8. The UE of claim 6, further comprising:
wherein the measurement information includes information about a measurement period for measurement of the UE,
wherein the operations further comprise: the measurement period is adjusted based on the UE failing to measure at the measurable point.
9. The UE of claim 8,
wherein the operations further comprise: reporting the adjustment of the measurement period to the network.
10. The UE of claim 6,
wherein the threshold is 10 degrees.
11. An apparatus in mobile communication, comprising:
at least one processor; and
at least one memory storing instructions and operatively electrically connected to the at least one processor, the operations performed based on execution of the instructions by the at least one processor comprising:
receiving a synchronization signal from a network;
receiving, from the network, system information related to NTN based on the device being connected to the network via an NTN satellite;
transmitting RACH (random access channel) to the network;
receiving an RA (random access) response message from the network;
the measurement information is received from the network,
wherein the measurement information comprises information about a measurement point for measurement of the device;
Determining a measurable point in time at which an altitude of a target satellite exceeds a threshold based on orbit information of the target satellite;
sending a failure message to the network based on the measurement point being earlier than the measurable point; and
measurements are performed at the measurable points.
12. A non-transitory computer readable storage medium having recorded instructions,
wherein the instructions, based on execution by one or more processors, cause the one or more processors to:
receiving a synchronization signal from a network;
receiving NTN-related system information from the network based on a device comprising the non-transitory computer-readable storage medium connecting to the network via an NTN satellite;
transmitting RACH (random access channel) to the network;
receiving an RA (random access) response message from the network;
the measurement information is received from the network,
wherein the measurement information comprises information about measurement points for the device measurements;
determining a measurable point in time at which an altitude of a target satellite exceeds a threshold based on orbit information of the target satellite;
sending a failure message to the network based on the measurement point being earlier than the measurable point; and
Measurements are performed at the measurable points.
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| KR10-2021-0060545 | 2021-05-11 | ||
| KR10-2022-0002997 | 2022-01-07 | ||
| KR20220002997 | 2022-01-07 | ||
| PCT/KR2022/006664 WO2022240142A1 (en) | 2021-05-11 | 2022-05-10 | Measurement in ntn communication |
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| Publication Number | Publication Date |
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| CN117296367A true CN117296367A (en) | 2023-12-26 |
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| CN202280033842.XA Pending CN117296367A (en) | 2021-05-11 | 2022-05-10 | Measurement in NTN communication |
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