WO2020222595A1 - Gestion de liaison latérale à l'aide d'informations de commande de liaison latérale et d'attribution de ressources - Google Patents

Gestion de liaison latérale à l'aide d'informations de commande de liaison latérale et d'attribution de ressources Download PDF

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Publication number
WO2020222595A1
WO2020222595A1 PCT/KR2020/005839 KR2020005839W WO2020222595A1 WO 2020222595 A1 WO2020222595 A1 WO 2020222595A1 KR 2020005839 W KR2020005839 W KR 2020005839W WO 2020222595 A1 WO2020222595 A1 WO 2020222595A1
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Prior art keywords
sci
sidelink
transmission
processor
priority
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PCT/KR2020/005839
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English (en)
Inventor
Youngdae Lee
Hanbyul Seo
Giwon Park
Jongyoul LEE
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Lg Electronics Inc.
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Publication of WO2020222595A1 publication Critical patent/WO2020222595A1/fr

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    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04W—WIRELESS COMMUNICATION NETWORKS
    • H04W4/00—Services specially adapted for wireless communication networks; Facilities therefor
    • H04W4/30—Services specially adapted for particular environments, situations or purposes
    • H04W4/40—Services specially adapted for particular environments, situations or purposes for vehicles, e.g. vehicle-to-pedestrians [V2P]
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
    • H04L67/00—Network arrangements or protocols for supporting network services or applications
    • H04L67/01—Protocols
    • H04L67/131—Protocols for games, networked simulations or virtual reality
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04W—WIRELESS COMMUNICATION NETWORKS
    • H04W72/00—Local resource management
    • H04W72/20—Control channels or signalling for resource management
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04W—WIRELESS COMMUNICATION NETWORKS
    • H04W76/00—Connection management
    • H04W76/10—Connection setup
    • H04W76/14—Direct-mode setup
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04W—WIRELESS COMMUNICATION NETWORKS
    • H04W72/00—Local resource management
    • H04W72/50—Allocation or scheduling criteria for wireless resources
    • H04W72/56—Allocation or scheduling criteria for wireless resources based on priority criteria
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04W—WIRELESS COMMUNICATION NETWORKS
    • H04W76/00—Connection management
    • H04W76/10—Connection setup
    • H04W76/11—Allocation or use of connection identifiers
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04W—WIRELESS COMMUNICATION NETWORKS
    • H04W92/00—Interfaces specially adapted for wireless communication networks
    • H04W92/16—Interfaces between hierarchically similar devices
    • H04W92/18—Interfaces between hierarchically similar devices between terminal devices

Definitions

  • the present disclosure relates to management of sidelink using sidelink control information (SCI) and resource allocation.
  • SCI sidelink control information
  • 5G new radio is a new radio access technology (RAT) developed by 3rd generation partnership project (3GPP) for the 5G (fifth generation) mobile network. It was designed to be the global standard for the air interface of 5G networks.
  • 3GPP 3rd generation partnership project
  • 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.
  • eMBB enhanced mobile broadband
  • mMTC massive machine-type-communications
  • URLLC ultra-reliable and low latency communications
  • the NR shall be inherently forward compatible.
  • V2X communication is the passing of information from a vehicle to any entity that may affect the vehicle, and vice versa. It is a vehicular communication system that incorporates other more specific types of communication as vehicle-to-infrastructure (V2I), vehicle-to-network (V2N), vehicle-to-vehicle (V2V), vehicle-to-pedestrian (V2P), vehicle-to-device (V2D) and vehicle-to-grid (V2G).
  • V2I vehicle-to-infrastructure
  • V2N vehicle-to-network
  • V2V vehicle-to-vehicle
  • V2P vehicle-to-pedestrian
  • V2D vehicle-to-device
  • V2G vehicle-to-grid
  • An aspect of the present disclosure is to provide a method and apparatus for allocating and/or determining a priority for transmission of control information.
  • Another aspect of the present disclosure is to provide a method and apparatus for transmission of control information for sidelink management, particularly without scheduling data.
  • a method for a first wireless device in a wireless communication system includes determining that data is not available for a logical channel, determining a priority for transmission of sidelink control information (SCI), and transmitting, to a second wireless device, the SCI including the priority.
  • SCI sidelink control information
  • an apparatus for implementing the above method is provided.
  • the present disclosure can have various advantageous effects.
  • a UE can transmit control information (e.g., SCI) for sidelink management with appropriate priority.
  • control information e.g., SCI
  • a UE can reserve a resource and transmit control information (e.g., SCI) for a direct link with other UE, in particular when the UE has no data to be transmitted to the other UE.
  • control information e.g., SCI
  • the system can reliably manage a direct link between two UEs performing sidelink communication.
  • FIG. 1 shows examples of 5G usage scenarios to which the technical features of the present disclosure can be applied.
  • FIG. 2 shows an example of a wireless communication system to which the technical features of the present disclosure can be applied.
  • FIG. 3 shows an example of a wireless communication system to which the technical features of the present disclosure can be applied.
  • FIG. 4 shows another example of a wireless communication system to which the technical features of the present disclosure can be applied.
  • FIG. 5 shows a block diagram of a user plane protocol stack to which the technical features of the present disclosure can be applied.
  • FIG. 6 shows a block diagram of a control plane protocol stack to which the technical features of the present disclosure can be applied.
  • FIG. 7 shows another example of a wireless communication system to which the technical features of the present disclosure can be applied.
  • FIG. 8 shows a UE to which the technical features of the present disclosure can be applied.
  • FIG. 9 shows an example of a method for a first wireless device to which the technical features of the present disclosure can be applied.
  • FIG. 10 shows an example of a method for performing sidelink communication for a UE to which the technical features of the present disclosure can be applied.
  • FIG. 11 shows an example of an AI device to which the technical features of the present disclosure can be applied.
  • FIG. 12 shows an example of an AI system to which the technical features of the present disclosure can be applied.
  • the technical features described below may be used by a communication standard by the 3rd generation partnership project (3GPP) standardization organization, a communication standard by the institute of electrical and electronics engineers (IEEE), etc.
  • the communication standards by the 3GPP standardization organization include long-term evolution (LTE) and/or evolution of LTE systems.
  • LTE long-term evolution
  • LTE-A LTE-advanced
  • LTE-A Pro LTE-A Pro
  • NR 5G new radio
  • the communication standard by the IEEE standardization organization includes a wireless local area network (WLAN) system such as IEEE 802.11a/b/g/n/ac/ax.
  • WLAN wireless local area network
  • the above system uses various multiple access technologies such as orthogonal frequency division multiple access (OFDMA) and/or single carrier frequency division multiple access (SC-FDMA) for downlink (DL) and/or uplink (UL).
  • OFDMA orthogonal frequency division multiple access
  • SC-FDMA single carrier frequency division multiple access
  • OFDMA and SC-FDMA may be used for DL and/or UL.
  • implementations of the present disclosure are mainly described in regards to a 3GPP based wireless communication system.
  • the technical features of the present disclosure are not limited thereto.
  • 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.
  • a or B may mean “only A”, “only B”, or “both A and B”.
  • a or B in the present disclosure may be interpreted as “A and/or B”.
  • A, B or C in the present disclosure may mean “only A”, “only B”, “only C”, or "any combination of A, B and C”.
  • slash (/) or comma (,) may mean “and/or”.
  • A/B may mean “A and/or B”.
  • A/B may mean "only A”, “only B”, or “both A and B”.
  • A, B, C may mean "A, B or C”.
  • At least one of A and B may mean “only A”, “only B” or “both A and B”.
  • 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”.
  • At least one of A, B and C may mean “only A”, “only B”, “only C”, or “any combination of A, B and C”.
  • 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”.
  • parentheses used in the present disclosure may mean “for example”.
  • control information PDCCH
  • PDCCH PDCCH
  • PDCCH PDCCH
  • FIG. 1 shows examples of 5G usage scenarios to which the technical features of the present disclosure can be applied.
  • 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.
  • the three main requirements areas of 5G include (1) enhanced mobile broadband (eMBB) domain, (2) massive machine type communication (mMTC) area, and (3) ultra-reliable and low latency communications (URLLC) area.
  • eMBB enhanced mobile broadband
  • mMTC massive machine type communication
  • URLLC ultra-reliable and low latency communications
  • KPI key performance indicator
  • eMBB focuses on across-the-board enhancements to the data rate, latency, user density, capacity and coverage of mobile broadband access.
  • the eMBB aims ⁇ 10 Gbps of throughput.
  • eMBB far surpasses basic mobile Internet access and covers rich interactive work and media and entertainment applications in cloud and/or augmented reality.
  • Data is one of the key drivers of 5G and may not be able to see dedicated voice services for the first time in the 5G era.
  • the voice is expected to be processed as an application simply using the data connection provided by the communication system.
  • the main reason for the increased volume of traffic is an increase in the size of the content and an increase in the number of applications requiring high data rates.
  • Streaming services (audio and video), interactive video and mobile Internet connectivity will become more common as more devices connect to the Internet. Many of these applications require always-on connectivity to push real-time information and notifications to the user.
  • Cloud storage and applications are growing rapidly in mobile communication platforms, which can be applied to both work and entertainment.
  • Cloud storage is a special use case that drives growth of uplink data rate.
  • 5G is also used for remote tasks on the cloud and requires much lower end-to-end delay to maintain a good user experience when the tactile interface is used.
  • cloud games and video streaming are another key factor that increases the demand for mobile broadband capabilities. Entertainment is essential in smartphones and tablets anywhere, including high mobility environments such as trains, cars and airplanes.
  • Another use case is augmented reality and information retrieval for entertainment.
  • augmented reality requires very low latency and instantaneous data amount.
  • mMTC is designed to enable communication between devices that are low-cost, massive in number and battery-driven, intended to support applications such as smart metering, logistics, and field and body sensors.
  • mMTC aims ⁇ 10 years on battery and/or ⁇ 1 million devices/km2.
  • mMTC allows seamless integration of embedded sensors in all areas and is one of the most widely used 5G applications.
  • IoT internet-of-things
  • Industrial IoT is one of the areas where 5G plays a key role in enabling smart cities, asset tracking, smart utilities, agriculture and security infrastructures.
  • URLLC will make it possible for devices and machines to communicate with ultra-reliability, very low latency and high availability, making it ideal for vehicular communication, industrial control, factory automation, remote surgery, smart grids and public safety applications.
  • URLLC aims ⁇ 1ms of latency.
  • URLLC includes new services that will change the industry through links with ultra-reliability / low latency, such as remote control of key infrastructure and self-driving vehicles.
  • the level of reliability and latency is essential for smart grid control, industrial automation, robotics, drones control and coordination.
  • 5G can complement fiber-to-the-home (FTTH) and cable-based broadband (or DOCSIS) as a means of delivering streams rated from hundreds of megabits per second to gigabits per second.
  • This high speed can be required to deliver TVs with resolutions of 4K or more (6K, 8K and above) as well as virtual reality (VR) and augmented reality (AR).
  • VR and AR applications include mostly immersive sporting events. Certain applications may require special network settings. For example, in the case of a VR game, a game company may need to integrate a core server with an edge network server of a network operator to minimize delay.
  • Automotive is expected to become an important new driver for 5G, with many use cases for mobile communications to vehicles. For example, entertainment for passengers demands high capacity and high mobile broadband at the same time. This is because future users will continue to expect high-quality connections regardless of their location and speed.
  • Another use case in the automotive sector is an augmented reality dashboard.
  • the driver can identify an object in the dark on top of what is being viewed through the front window through the augmented reality dashboard.
  • the augmented reality dashboard displays information that will inform the driver about the object's distance and movement.
  • the wireless module enables communication between vehicles, information exchange between the vehicle and the supporting infrastructure, and information exchange between the vehicle and other connected devices (e.g., devices accompanied by a pedestrian).
  • the safety system allows the driver to guide the alternative course of action so that he can drive more safely, thereby reducing the risk of accidents.
  • the next step will be a remotely controlled vehicle or self-driving vehicle. This requires a very reliable and very fast communication between different self-driving vehicles and between vehicles and infrastructure. In the future, a self-driving vehicle will perform all driving activities, and the driver will focus only on traffic that the vehicle itself cannot identify.
  • the technical requirements of self-driving vehicles require ultra-low latency and high-speed reliability to increase traffic safety to a level not achievable by humans.
  • Smart cities and smart homes which are referred to as smart societies, will be embedded in high density wireless sensor networks.
  • the distributed network of intelligent sensors will identify conditions for cost and energy-efficient maintenance of a city or house. A similar setting can be performed for each home.
  • Temperature sensors, windows and heating controllers, burglar alarms and appliances are all wirelessly connected. Many of these sensors typically require low data rate, low power and low cost.
  • real-time high-definition (HD) video may be required for certain types of devices for monitoring.
  • the smart grid interconnects these sensors using digital information and communication technologies to collect and act on information. This information can include supplier and consumer behavior, allowing the smart grid to improve the distribution of fuel, such as electricity, in terms of efficiency, reliability, economy, production sustainability, and automated methods.
  • the smart grid can be viewed as another sensor network with low latency.
  • the health sector has many applications that can benefit from mobile communications.
  • Communication systems can support telemedicine to provide clinical care in remote locations. This can help to reduce barriers to distance and improve access to health services that are not continuously available in distant rural areas. It is also used to save lives in critical care and emergency situations.
  • Mobile communication based wireless sensor networks can provide remote monitoring and sensors for parameters such as heart rate and blood pressure.
  • Wireless and mobile communications are becoming increasingly important in industrial applications. Wiring costs are high for installation and maintenance. Thus, the possibility of replacing a cable with a wireless link that can be reconfigured is an attractive opportunity in many industries. However, achieving this requires that wireless connections operate with similar delay, reliability, and capacity as cables and that their management is simplified. Low latency and very low error probabilities are new requirements that need to be connected to 5G.
  • Logistics and freight tracking are important use cases of mobile communications that enable tracking of inventory and packages anywhere using location based information systems. Use cases of logistics and freight tracking typically require low data rates, but require a large range and reliable location information.
  • FIG. 2 shows an example of a wireless communication system to which the technical features of the present disclosure can be applied.
  • the wireless communication system may include a first device 210 and a second device 220.
  • the first device 210 includes a base station, a network node, a transmitting UE, a receiving UE, a wireless device, a wireless communication device, a vehicle, a vehicle equipped with an autonomous driving function, a connected car, a drone, an unmanned aerial vehicle (UAV), an artificial intelligence (AI) module, a robot, an AR device, a VR device, a mixed reality (MR) device, a hologram device, a public safety device, an MTC device, an IoT device, a medical device, a fin-tech device (or, a financial device), a security device, a climate/environmental device, a device related to 5G services, or a device related to the fourth industrial revolution.
  • UAV unmanned aerial vehicle
  • AI artificial intelligence
  • MR mixed reality
  • hologram device a public safety device
  • MTC device an IoT device
  • medical device a fin-tech device (or, a financial device)
  • a security device a climate/environmental device, a device
  • the second device 220 includes a base station, a network node, a transmitting UE, a receiving UE, a wireless device, a wireless communication device, a vehicle, a vehicle equipped with an autonomous driving function, a connected car, a drone, a 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 fin-tech device (or, a financial device), a security device, a climate/environmental device, a device related to 5G services, or a device related to the fourth industrial revolution.
  • the UE may include a mobile phone, a smart phone, a laptop computer, a digital broadcasting terminal, a personal digital assistant (PDA), a portable multimedia player (PMP), a navigation device, a slate personal computer (PC), a tablet PC, an ultrabook, a wearable device (e.g., a smartwatch, a smart glass, a head mounted display (HMD)) .
  • the HMD may be a display device worn on the head.
  • the HMD may be used to implement AR, VR and/or MR.
  • the drone may be a flying object that is flying by a radio control signal without a person boarding it.
  • the VR device may include a device that implements an object or background in the virtual world.
  • the AR device may include a device that implements connection of an object and/or a background of a virtual world to an object and/or a background of the real world.
  • the MR device may include a device that implements fusion of an object and/or a background of a virtual world to an object and/or a background of the real world.
  • the hologram device may include a device that implements a 360-degree stereoscopic image by recording and playing stereoscopic information by utilizing a phenomenon of interference of light generated by the two laser lights meeting with each other, called holography.
  • the public safety device may include a video relay device or a video device that can be worn by the user's body.
  • the MTC device and the IoT device may be a device that do not require direct human intervention or manipulation.
  • the MTC device and the IoT device may include a smart meter, a vending machine, a thermometer, a smart bulb, a door lock and/or various sensors.
  • the medical device may be a device used for the purpose of diagnosing, treating, alleviating, handling, or preventing a disease.
  • the medical device may be a device used for the purpose of diagnosing, treating, alleviating, or correcting an injury or disorder.
  • the medical device may be a device used for the purpose of inspecting, replacing or modifying a structure or function.
  • the medical device may be a device used for the purpose of controlling pregnancy.
  • the medical device may include a treatment device, a surgical device, an (in vitro) diagnostic device, a hearing aid and/or a procedural device, etc.
  • a security device may be a device installed to prevent the risk that may occur and to maintain safety.
  • the security device may include a camera, a closed-circuit TV (CCTV), a recorder, or a black box.
  • the fin-tech device may be a device capable of providing financial services such as mobile payment.
  • the fin-tech device may include a payment device or a point of sales (POS).
  • the climate/environmental device may include a device for monitoring or predicting the climate/environment.
  • the first device 210 may include at least one or more processors, such as a processor 211, at least one memory, such as a memory 212, and at least one transceiver, such as a transceiver 213.
  • the processor 211 may perform the functions, procedures, and/or methods of the present disclosure described below.
  • the processor 211 may perform one or more protocols. For example, the processor 211 may perform one or more layers of the air interface protocol.
  • the memory 212 is connected to the processor 211 and may store various types of information and/or instructions.
  • the transceiver 213 is connected to the processor 211 and may be controlled to transmit and receive wireless signals.
  • the second device 220 may include at least one or more processors, such as a processor 221, at least one memory, such as a memory 222, and at least one transceiver, such as a transceiver 223.
  • the processor 221 may perform the functions, procedures, and/or methods of the present disclosure described below.
  • the processor 221 may perform one or more protocols. For example, the processor 221 may perform one or more layers of the air interface protocol.
  • the memory 222 is connected to the processor 221 and may store various types of information and/or instructions.
  • the transceiver 223 is connected to the processor 221 and may be controlled to transmit and receive wireless signals.
  • the memory 212, 222 may be connected internally or externally to the processor 211, 221, or may be connected to other processors via a variety of technologies such as wired or wireless connections.
  • the first device 210 and/or the second device 220 may have more than one antenna.
  • antenna 214 and/or antenna 224 may be configured to transmit and receive wireless signals.
  • FIG. 3 shows an example of a wireless communication system to which the technical features of the present disclosure can be applied.
  • FIG. 3 shows a system architecture based on an evolved-UMTS terrestrial radio access network (E-UTRAN).
  • E-UTRAN evolved-UMTS terrestrial radio access network
  • the aforementioned LTE is a part of an evolved-UTMS (e-UMTS) using the E-UTRAN.
  • e-UMTS evolved-UTMS
  • the wireless communication system includes one or more user equipment (UE) 310, an E-UTRAN and an evolved packet core (EPC).
  • the UE 310 refers to a communication equipment carried by a user.
  • the UE 310 may be fixed or mobile.
  • the UE 310 may be referred to as another terminology, such as a mobile station (MS), a user terminal (UT), a subscriber station (SS), a wireless device, etc.
  • MS mobile station
  • UT user terminal
  • SS subscriber station
  • wireless device etc.
  • the E-UTRAN consists of one or more evolved NodeB (eNB) 320.
  • the eNB 320 provides the E-UTRA user plane and control plane protocol terminations towards the UE 10.
  • the eNB 320 is generally a fixed station that communicates with the UE 310.
  • the eNB 320 hosts the functions, such as inter-cell radio resource management (RRM), radio bearer (RB) control, connection mobility control, radio admission control, measurement configuration/provision, dynamic resource allocation (scheduler), etc.
  • RRM inter-cell radio resource management
  • RB radio bearer
  • connection mobility control such as connection mobility control
  • radio admission control such as measurement configuration/provision
  • the eNB 320 may be referred to as another terminology, such as a base station (BS), a base transceiver system (BTS), an access point (AP), etc.
  • BS base station
  • BTS base transceiver system
  • AP access point
  • a downlink (DL) denotes communication from the eNB 320 to the UE 310.
  • An uplink (UL) denotes communication from the UE 310 to the eNB 320.
  • a sidelink (SL) denotes communication between the UEs 310.
  • a transmitter may be a part of the eNB 320, and a receiver may be a part of the UE 310.
  • the transmitter may be a part of the UE 310, and the receiver may be a part of the eNB 320.
  • the transmitter and receiver may be a part of the UE 310.
  • the EPC includes a mobility management entity (MME), a serving gateway (S-GW) and a packet data network (PDN) gateway (P-GW).
  • MME hosts the functions, such as non-access stratum (NAS) security, idle state mobility handling, evolved packet system (EPS) bearer control, etc.
  • NAS non-access stratum
  • EPS evolved packet system
  • the S-GW hosts the functions, such as mobility anchoring, etc.
  • the S-GW is a gateway having an E-UTRAN as an endpoint.
  • MME/S-GW 330 will be referred to herein simply as a "gateway," but it is understood that this entity includes both the MME and S-GW.
  • the P-GW hosts the functions, such as UE Internet protocol (IP) address allocation, packet filtering, etc.
  • IP Internet protocol
  • the P-GW is a gateway having a PDN as an endpoint.
  • the P-GW is connected to an external network.
  • the UE 310 is connected to the eNB 320 by means of the Uu interface.
  • the UEs 310 are interconnected with each other by means of the PC5 interface.
  • the eNBs 320 are interconnected with each other by means of the X2 interface.
  • the eNBs 320 are also connected by means of the S1 interface to the EPC, more specifically to the MME by means of the S1-MME interface and to the S-GW by means of the S1-U interface.
  • the S1 interface supports a many-to-many relation between MMEs / S-GWs and eNBs.
  • FIG. 4 shows another example of a wireless communication system to which the technical features of the present disclosure can be applied.
  • FIG. 4 shows a system architecture based on a 5G NR.
  • the entity used in the 5G NR (hereinafter, simply referred to as "NR") may absorb some or all of the functions of the entities introduced in FIG. 3 (e.g., eNB, MME, S-GW).
  • the entity used in the NR may be identified by the name "NG" for distinction from the LTE/LTE-A.
  • the wireless communication system includes one or more UE 410, a next-generation RAN (NG-RAN) and a 5th generation core network (5GC).
  • the NG-RAN consists of at least one NG-RAN node.
  • the NG-RAN node is an entity corresponding to the eNB 320 shown in FIG. 3.
  • the NG-RAN node consists of at least one gNB 421 and/or at least one ng-eNB 422.
  • the gNB 421 provides NR user plane and control plane protocol terminations towards the UE 410.
  • the ng-eNB 422 provides E-UTRA user plane and control plane protocol terminations towards the UE 410.
  • the 5GC includes an access and mobility management function (AMF), a user plane function (UPF) and a session management function (SMF).
  • AMF hosts the functions, such as NAS security, idle state mobility handling, etc.
  • the AMF is an entity including the functions of the conventional MME.
  • the UPF hosts the functions, such as mobility anchoring, protocol data unit (PDU) handling.
  • PDU protocol data unit
  • the UPF an entity including the functions of the conventional S-GW.
  • the SMF hosts the functions, such as UE IP address allocation, PDU session control.
  • the gNBs 421 and ng-eNBs 422 are interconnected with each other by means of the Xn interface.
  • the gNBs 421 and ng-eNBs 422 are also connected by means of the NG interfaces to the 5GC, more specifically to the AMF by means of the NG-C interface and to the UPF by means of the NG-U interface.
  • layers of a radio interface protocol between the UE and the network may be classified into a first layer (L1), a second layer (L2), and a third layer (L3) based on the lower three layers of the open system interconnection (OSI) model that is well-known in the communication system.
  • OSI open system interconnection
  • NR supports multiple numerology (or, subcarrier spacing (SCS)) to support various 5G services. For example, when the SCS is 15 kHz, wide area in traditional cellular bands may be supported. When the SCS is 30 kHz/60 kHz, dense-urban, lower latency and wider carrier bandwidth may be supported. When the SCS is 60 kHz or higher, a bandwidth greater than 24.25 GHz may be supported to overcome phase noise.
  • SCS subcarrier spacing
  • 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.
  • the frequency ranges of the two types may be as shown in Table 1 below.
  • FR1 may mean "sub 6 GHz range”
  • FR2 may mean "above 6 GHz range”
  • mmW millimeter wave
  • 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, 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).
  • FIG. 5 shows a block diagram of a user plane protocol stack to which the technical features of the present disclosure can be applied.
  • FIG. 6 shows a block diagram of a control plane protocol stack to which the technical features of the present disclosure can be applied.
  • the user/control plane protocol stacks shown in FIG. 5 and FIG. 6 are used in NR. However, user/control plane protocol stacks shown in FIG. 5 and FIG. 6 may be used in LTE/LTE-A without loss of generality, by replacing gNB/AMF with eNB/MME.
  • the PHY layer offers information transfer services to media access control (MAC) sublayer and higher layers.
  • the PHY layer offers to the MAC sublayer transport channels. Data between the MAC sublayer and the PHY layer is transferred via the transport channels. Between different PHY layers, i.e., between a PHY layer of a transmission side and a PHY layer of a reception side, data is transferred via the physical channels.
  • the MAC sublayer belongs to L2.
  • the main services and functions of the MAC sublayer include mapping between logical channels and transport channels, multiplexing/de-multiplexing of MAC service data units (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), priority handling between UEs by means of dynamic scheduling, priority handling between logical channels of one UE by means of logical channel prioritization (LCP), etc.
  • the MAC sublayer offers to the radio link control (RLC) sublayer logical channels.
  • RLC radio link control
  • the RLC sublayer belong to L2.
  • the RLC sublayer supports three transmission modes, i.e. transparent mode (TM), unacknowledged mode (UM), and acknowledged mode (AM), in order to guarantee various quality of services (QoS) required by radio bearers.
  • TM transparent mode
  • UM unacknowledged mode
  • AM acknowledged mode
  • the main services and functions of the RLC sublayer depend on the transmission mode.
  • the RLC sublayer provides transfer of upper layer PDUs for all three modes, but provides error correction through ARQ for AM only.
  • LTE/LTE-A the RLC sublayer provides concatenation, segmentation and reassembly of RLC SDUs (only for UM and AM data transfer) and re-segmentation of RLC data PDUs (only for AM data transfer).
  • the RLC sublayer provides segmentation (only for AM and UM) and re-segmentation (only for AM) of RLC SDUs and reassembly of SDU (only for AM and UM). That is, the NR does not support concatenation of RLC SDUs.
  • the RLC sublayer offers to the packet data convergence protocol (PDCP) sublayer RLC channels.
  • PDCP packet data convergence protocol
  • the PDCP sublayer belong to L2.
  • the main services and functions of the PDCP sublayer for the user plane include header compression and decompression, transfer of user data, duplicate detection, PDCP PDU routing, retransmission of PDCP SDUs, ciphering and deciphering, etc.
  • the main services and functions of the PDCP sublayer for the control plane include ciphering and integrity protection, transfer of control plane data, etc.
  • the service data adaptation protocol (SDAP) sublayer belong to L2.
  • the SDAP sublayer is only defined in the user plane.
  • the SDAP sublayer is only defined for NR.
  • the main services and functions of SDAP include, mapping between a QoS flow and a data radio bearer (DRB), and marking QoS flow ID (QFI) in both DL and UL packets.
  • the SDAP sublayer offers to 5GC QoS flows.
  • a radio resource control (RRC) layer belongs to L3.
  • the RRC layer is only defined in the control plane.
  • the RRC layer controls radio resources between the UE and the network.
  • the RRC layer exchanges RRC messages between the UE and the BS.
  • the main services and functions of the RRC layer include broadcast of system information related to AS and NAS, paging, establishment, maintenance and release of an RRC connection between the UE and the network, security functions including key management, establishment, configuration, maintenance and release of radio bearers, mobility functions, QoS management functions, UE measurement reporting and control of the reporting, NAS message transfer to/from NAS from/to UE.
  • the RRC layer controls logical channels, transport channels, and physical channels in relation to the configuration, reconfiguration, and release of radio bearers.
  • a radio bearer refers to a logical path provided by L1 (PHY layer) and L2 (MAC/RLC/PDCP/SDAP sublayer) for data transmission between a UE and a network.
  • Setting the radio bearer means defining the characteristics of the radio protocol layer and the channel for providing a specific service, and setting each specific parameter and operation method.
  • Radio bearer may be divided into signaling RB (SRB) and data RB (DRB).
  • SRB signaling RB
  • DRB data RB
  • An RRC state indicates whether an RRC layer of the UE is logically connected to an RRC layer of the E-UTRAN.
  • RRC_CONNECTED when the RRC connection is established between the RRC layer of the UE and the RRC layer of the E-UTRAN, the UE is in the RRC connected state (RRC_CONNECTED). Otherwise, the UE is in the RRC idle state (RRC_IDLE).
  • RRC_INACTIVE is additionally introduced.
  • RRC_INACTIVE may be used for various purposes. For example, the massive machine type communications (MMTC) UEs can be efficiently managed in RRC_INACTIVE. When a specific condition is satisfied, transition is made from one of the above three states to the other.
  • a predetermined operation may be performed according to the RRC state.
  • RRC_IDLE public land mobile network (PLMN) selection, broadcast of system information (SI), cell re-selection mobility, core network (CN) paging and discontinuous reception (DRX) configured by NAS may be performed.
  • PLMN public land mobile network
  • SI system information
  • CN core network
  • DRX discontinuous reception
  • the UE shall have been allocated an identifier (ID) which uniquely identifies the UE in a tracking area. No RRC context stored in the BS.
  • the UE has an RRC connection with the network (i.e. E-UTRAN/NG-RAN).
  • Network-CN connection (both C/U-planes) is also established for UE.
  • the UE AS context is stored in the network and the UE.
  • the RAN knows the cell which the UE belongs to.
  • the network can transmit and/or receive data to/from UE.
  • Network controlled mobility including measurement is also performed.
  • RRC_IDLE Most of operations performed in RRC_IDLE may be performed in RRC_INACTIVE. But, instead of CN paging in RRC_IDLE, RAN paging is performed in RRC_INACTIVE. In other words, in RRC_IDLE, paging for mobile terminated (MT) data is initiated by core network and paging area is managed by core network. In RRC_INACTIVE, paging is initiated by NG-RAN, and RAN-based notification area (RNA) is managed by NG-RAN. Further, instead of DRX for CN paging configured by NAS in RRC_IDLE, DRX for RAN paging is configured by NG-RAN in RRC_INACTIVE.
  • DRX for CN paging configured by NAS in RRC_IDLE
  • DRX for RAN paging is configured by NG-RAN in RRC_INACTIVE.
  • 5GC-NG-RAN connection (both C/U-planes) is established for UE, and the UE AS context is stored in NG-RAN and the UE.
  • NG-RAN knows the RNA which the UE belongs to.
  • the NAS layer is located at the top of the RRC layer.
  • the NAS control protocol performs the functions, such as authentication, mobility management, security control.
  • FIG. 7 shows another example of a wireless communication system to which the technical features of the present disclosure can be applied.
  • wireless devices 710 and 720 may correspond to the wireless devices 210 and 220 of FIG. 2 and may be configured by various elements, components, units/portions, and/or modules.
  • the first wireless device 710 may include at least one transceiver, such as a transceiver 711, and at least one processing chip, such as a processing chip 712.
  • the processing chip 712 may include at least one processor, such a processor 713, and at least one memory, such as a memory 714.
  • the memory 714 may be operably connectable to the processor 713.
  • the memory 714 may store various types of information and/or instructions.
  • the memory 714 may store a software code 715 which implements instructions that, when executed by the processor 713, perform the descriptions, functions, procedures, suggestions, methods and/or operational flowcharts disclosed in the present disclosure.
  • the software code 715 may implement instructions that, when executed by the processor 713, perform the descriptions, functions, procedures, suggestions, methods and/or operational flowcharts disclosed in the present disclosure.
  • the software code 715 may control the processor 713 to perform one or more protocols.
  • the software code 715 may control the processor 713 may perform one or more layers of the radio interface protocol.
  • the second wireless device 720 may include at least one transceiver, such as a transceiver 721, and at least one processing chip, such as a processing chip 722.
  • the processing chip 722 may include at least one processor, such a processor 723, and at least one memory, such as a memory 724.
  • the memory 724 may be operably connectable to the processor 723.
  • the memory 724 may store various types of information and/or instructions.
  • the memory 724 may store a software code 725 which implements instructions that, when executed by the processor 723, perform the descriptions, functions, procedures, suggestions, methods and/or operational flowcharts disclosed in the present disclosure.
  • the software code 725 may implement instructions that, when executed by the processor 723, perform the descriptions, functions, procedures, suggestions, methods and/or operational flowcharts disclosed in the present disclosure.
  • the software code 725 may control the processor 723 to perform one or more protocols.
  • the software code 725 may control the processor 723 may perform one or more layers of the radio interface protocol.
  • FIG. 8 shows a UE to which the technical features of the present disclosure can be applied.
  • a UE includes a processor 810, a power management module 811, a battery 812, a display 813, a keypad 814, a subscriber identification module (SIM) card 815, a memory 820, a transceiver 830, one or more antennas 831, a speaker 840, and a microphone 841.
  • SIM subscriber identification module
  • the processor 810 may be configured to implement the descriptions, functions, procedures, suggestions, methods and/or operational flowcharts disclosed in the present disclosure.
  • the processor 810 may be configured to control one or more other components of the UE 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 810.
  • the processor 810 may include ASIC, other chipset, logic circuit and/or data processing device.
  • the processor 810 may be an application processor.
  • the processor 810 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).
  • DSP digital signal processor
  • CPU central processing unit
  • GPU graphics processing unit
  • modem modulator and demodulator
  • processor 810 may be found in SNAPDRAGON TM series of processors made by Qualcomm ® , EXYNOS TM series of processors made by Samsung ® , A series of processors made by Apple ® , HELIO TM series of processors made by MediaTek ® , ATOM TM series of processors made by Intel ® or a corresponding next generation processor.
  • the power management module 811 manages power for the processor 810 and/or the transceiver 830.
  • the battery 812 supplies power to the power management module 811.
  • the display 813 outputs results processed by the processor 810.
  • the keypad 814 receives inputs to be used by the processor 810.
  • the keypad 814 may be shown on the display 813.
  • the SIM card 815 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.
  • IMSI international mobile subscriber identity
  • the memory 820 is operatively coupled with the processor 810 and stores a variety of information to operate the processor 810.
  • the memory 820 may include read-only memory (ROM), random access memory (RAM), flash memory, memory card, storage medium and/or other storage device.
  • the transceiver 830 is operatively coupled with the processor 810, and transmits and/or receives a radio signal.
  • the transceiver 830 includes a transmitter and a receiver.
  • the transceiver 830 may include baseband circuitry to process radio frequency signals.
  • the transceiver 830 controls the one or more antennas 831 to transmit and/or receive a radio signal.
  • the speaker 840 outputs sound-related results processed by the processor 810.
  • the microphone 841 receives sound-related inputs to be used by the processor 810.
  • V2X Vehicle-to-everything
  • V2X communication two types of PC5 reference points exist: the LTE based PC5 reference point, and the NR based PC5 reference point.
  • a UE may use either type of PC5 or both for V2X communication depending on the services the UE supports.
  • the V2X communication over PC5 reference point supports roaming and inter-public land mobile network (PLMN) operations.
  • V2X communication over PC5 reference point is supported when UE is "served by NR or E-UTRA" or when the UE is "not served by NR or E-UTRA".
  • a UE is authorized to transmit and receive V2X messages when it has valid authorization and configuration.
  • the V2X communication over PC5 reference point has the following characteristics:
  • V2X communication over LTE based PC5 reference point is connectionless, i.e., broadcast mode at access stratum (AS) layer, and there is no signaling over PC5 for connection establishment.
  • AS access stratum
  • V2X communication over NR based PC5 reference point supports broadcast mode, groupcast mode, and unicast mode at AS layer.
  • the UE will indicate the mode of communication for a V2X message to the AS layer.
  • Signaling over control plane over PC5 reference point for unicast mode communication management is supported.
  • V2X services communication support between UEs over PC5 user plane.
  • IP - V2X messages are exchanged between UEs over PC5 user plane. Both internet protocol (IP) based and non-IP based V2X messages are supported over PC5 reference point. For IP based V2X messages, only IP version 6 (IPv6) is used. IP version 4 (IPv4) is not supported.
  • IPv6 IP version 6
  • IPv4 IP version 4
  • UE decides on the type of PC5 reference point and Tx Profile to use for the transmission of a particular packet based on the configuration.
  • the communication over the emergency PDU session shall be prioritized over V2X communication over PC5 reference point.
  • Broadcast mode of communication is supported over both LTE based PC5 reference point and NR based PC5 reference point. Therefore, when broadcast mode is selected for transmission over PC5 reference point, PC5 RAT selection needs to be performed based on configuration.
  • broadcast mode is the only supported communication mode.
  • the broadcast mode also supports enhanced QoS handling.
  • Groupcast mode of communication is only supported over NR based PC5 reference point.
  • Unicast mode of communication is only supported over NR based PC5 reference point.
  • application layer initiates a V2X service which requires PC5 unicast communication
  • the UE establishes a PC5 unicast link with the corresponding UE.
  • V2X layer of the transmitting UE indicates to AS layer whether the message is for PC5-S signaling message (i.e., Direct Communication Accept, Link Layer Identifier Update Request/Response, Disconnect Request/Response) or service data transmission when it sends message over the established PC5 link.
  • PC5-S signaling message i.e., Direct Communication Accept, Link Layer Identifier Update Request/Response, Disconnect Request/Response
  • service data transmission when it sends message over the established PC5 link.
  • V2X layer of receiving UE handles message if it is PC5-S signaling message whilst the V2X layer of receiving UE forwards the message to the upper layer if it is application data message.
  • the unicast mode supports per-flow QoS model.
  • each UEs self-assign PC5 link identifier and associate the PC5 link identifier with the unicast link profile for the established unicast link.
  • the PC5 link identifier is a unique value within the UE.
  • the unicast link profile identified by PC5 link identifier includes application layer identifier and Layer-2 ID of UE A, application layer identifier and Layer-2 ID of UE B and a set of PC5 QoS flow identifier(s) (PFI(s)).
  • Each PFI is associated with QoS parameters (i.e., PC5 QoS indicator (PQI) and optionally range).
  • the PC5 link identifier and PFI(s) are unchanged values for the established unicast link regardless of the change of application layer identifier and Layer-2 ID.
  • the UE uses PFI to indicate the PC5 QoS flow to AS layer, therefore AS layer identifies the corresponding PC5 QoS flow even if the source and/or destination Layer-2 IDs are changed due to, e.g., privacy support.
  • the UE uses PC5 link identifier to indicate the PC5 unicast link to V2X application layer, therefore V2X application layer identifies the corresponding PC5 unicast link even if there are more than one unicast link associated with one service type (e.g., the UE establishes multiple unicast links with multiple UEs for a same service type).
  • Each UE has one or more Layer-2 IDs for V2X communication over PC5 reference point, consisting of:
  • Source and destination Layer-2 IDs are included in layer-2 frames sent on the layer-2 link of the PC5 reference point identifying the layer-2 source and destination of these frames.
  • Source Layer-2 IDs are always self-assigned by the UE originating the corresponding layer-2 frames.
  • the selection of the source and destination Layer-2 ID(s) by a UE depends on the communication mode of V2X communication over PC5 reference point for this layer-2 link, as described below in detail.
  • the source Layer-2 IDs may differ between different communication modes.
  • the UE configures a link local IPv6 address to be used as the source IP address.
  • the UE may use this IP address for V2X communication over PC5 reference point without sending Neighbor Solicitation and Neighbor Advertisement message for Duplicate Address Detection.
  • the source Layer-2 ID shall be changed over time and shall be randomized.
  • the source IP address shall also be changed over time and shall be randomized. The change of the identifiers of a source UE must be synchronized across layers used for PC5, e.g., when the application layer identifier changes, the source Layer-2 ID and the source IP address need to be changed.
  • the UE For broadcast mode of V2X communication over PC5 reference point, the UE is configured with the destination Layer-2 ID(s) to be used for V2X services.
  • the destination Layer-2 ID for a V2X communication is selected based on the configuration.
  • the UE self-selects a source Layer-2 ID.
  • the UE may use different source Layer-2 IDs for different types of PC5 reference points, i.e., LTE based PC5 and NR based PC5.
  • the V2X application layer may provide group identifier information.
  • the UE converts the provided group identifier into a destination Layer-2 ID.
  • the UE determines the destination Layer-2 ID based on configuration of the mapping between service type (e.g., PSID/ITS-AID) and Layer-2 ID.
  • the UE self-selects a source Layer-2 ID.
  • the destination Layer-2 ID used depends on the communication peer, which is discovered during the establishment of the unicast link.
  • the initial signaling for the establishment of the unicast link may use a default destination Layer-2 ID associated with the service type (e.g., PSID/ITS-AID) configured for unicast link establishment.
  • Layer-2 IDs are exchanged, and should be used for future communication between the two UEs.
  • the UE needs to maintain a mapping between the application layer identifiers and the source Layer-2 IDs used for the unicast links, as the V2X application layer does not use the Layer-2 IDs. This allows the change of source Layer-2 ID without interrupting the V2X applications.
  • the source Layer-2 ID(s) of the unicast link(s) shall be changed if the link(s) was used for V2X communication with the changed application layer identifiers.
  • a UE may establish multiple unicast links with a peer UE and use the same or different source Layer-2 IDs for these unicast links.
  • Radio link failure related actions are described. Section 5.3.10 of 3GPP TS 38.331 V15.5.0 can be referred.
  • the UE For detection of physical layer problems in RRC_CONNECTED, the UE shall:
  • the UE upon receiving N311 consecutive "in-sync" indications for the SpCell from lower layers while T310 is running, the UE shall:
  • the UE maintains the RRC connection without explicit signalling, i.e., the UE maintains the entire radio resource configuration.
  • the UE For detection of radio link failure, the UE shall:
  • the UE shall:
  • a UE measures signals transmitted by the base station. Then, a lower layer (e.g., physical layer) of a UE determines in-sync or out-of-sync and periodically indicates in-sync (IS) or out-of-sync (OOS) to an upper layer (e.g., RRC layer) of the UE. Based on the number of out-of-sync indications, the upper layer of the UE determines whether the radio link failure occurs or not.
  • a lower layer e.g., physical layer
  • IS in-sync
  • OOS out-of-sync
  • a UE e.g., RX UE
  • TX UE may be connected to another UE (e.g., TX UE) via a PC5-RRC connection and receive sidelink data from the TX UE.
  • the RX UE may measure the sidelink control information (SCI) transmitted by the TX UE for the PC5-RRC connection and then determine in-sync and/or out-of-sync based on the received SCI.
  • the TX UE may transmit the SCI only when SL data transmission occurs. Therefore, the RX UE may not receive the SCI sometimes. In this case, it is not clear how the RX UE can determine in-sync or out-of-sync based on the SCI.
  • SCI without SL data needs to be transmitted with appropriate priority for sidelink management.
  • the detailed operation for transmission of the SCI is not currently agreed.
  • the method in perspective of the wireless device described below may be performed by first device 210 shown in FIG. 2, the first wireless device 710 shown in FIG. 7 and/or the UE shown in FIG. 8.
  • the method in perspective of the wireless device described below may be performed by control of the processor 211 included in the first device 210 shown in FIG. 2, by control of the processor 713 included in the first wireless device 710 shown in FIG. 7 and/or by control of the processor 810 included in the UE shown in FIG. 8.
  • FIG. 9 shows an example of a method for a first wireless device to which the technical features of the present disclosure can be applied.
  • step S900 the wireless devise determines that data is not available for a logical channel.
  • step S910 the wireless device determines a priority for transmission of SCI.
  • the priority may be configured by a network and/or pre-configured by a pre-configuration stored in the first wireless device. According to implementations of the present disclosure, the priority may be a lowest priority and/or a highest priority. According to implementations of the present disclosure, the priority may inform transmission of the SCI without transmitting the data.
  • a value of the priority may be 1.
  • the SCI may inform that a sidelink shared channel (SL-SCH) is not transmitted.
  • the SCI may indicate an ID which informs that a SL-SCH transmission is not transmitted.
  • the ID may include at least one of a source ID, a destination ID and/or an ID associated with a unicast link between the first wireless device and the second wireless device.
  • step S920 the first wireless device transmits, to a second wireless device, the SCI including the priority.
  • the SCI may be transmitted by using a sidelink resource reserved based on a sidelink resource reservation.
  • the sidelink resource may not been reserved in a time duration after latest transmission of the SCI.
  • the time duration may correspond to a SCI period.
  • the first wireless device may be in communication with at least one of a mobile device, a network, and/or autonomous vehicles other than the wireless device.
  • the SCI transmission mentioned above may be related to reporting of sidelink channel state information (SL-SCI).
  • SCI sidelink channel state information
  • operation of the UE, specifically MAC entity of the UE may be as follows.
  • the MAC entity shall for each sidelink process:
  • 3> select the number of HARQ retransmissions from the allowed numbers that are configured by RRC in sl - MaxTxTransNumPSSCH included in sl - PSSCH -TxConfigList and, if configured by RRC, overlapped in sl - MaxTxTransNumPSSCH indicated in sl - CBR - PSSCH - TxConfigList for the highest priority of the logical channel(s) allowed on the carrier and the chanel busy ratio (CBR) measured by lower if CBR measurement results are available or the corresponding sl - defaultTxConfigIndex configured by RRC if CBR measurement results are not available;
  • CBR chanel busy ratio
  • 3> select an amount of frequency resources within the range that is configured by RRC between sl - MinSubChannelNumPSSCH and sl -MaxSubChannelNumPSSCH included in sl - PSSCH - TxConfigList and, if configured by RRC, overlapped between sl - MinSubChannelNumPSSCH and sl - MaxSubChannelNumPSSCH indicated in sl - CBR - PSSCH - TxConfigList for the highest priority of the logical channel(s) allowed on the carrier and the CBR measured by lower if CBR measurement results are available or the corresponding sl -defaultTxConfigIndex configured by RRC if CBR measurement results are not available;
  • PDB packet delay budget
  • PSCCH physical sidelink control channel
  • PSSCH physical sidelink shared channel
  • the MAC entity includes at most one Sidelink HARQ entity for transmission on SL-SCH, which maintains a number of parallel sidelink processes.
  • a sidelink process may be configured for transmissions of multiple MAC PDUs.
  • a delivered sidelink grant and its associated sidelink transmission information are associated with a sidelink process.
  • Each sidelink process supports one TB.
  • the sidelink HARQ entity shall:
  • 5> set the priority to the value of the highest priority of the logical channel(s) and a MAC CE, if any, if included, in the MAC PDU;
  • PFCH physical sidelink feedback channel
  • sidelink transmission information may be included in a SCI for a SL-SCH transmission.
  • the sidelink transmission information may consist of sidelink HARQ information including NDI, redundancy version (RV), sidelink process ID, source layer-1 ID and destination layer-1 ID, and sidelink QoS information including a priority, a communication range and location information.
  • sidelink HARQ information including NDI, redundancy version (RV), sidelink process ID, source layer-1 ID and destination layer-1 ID, and sidelink QoS information including a priority, a communication range and location information.
  • the SCI may include sidelink CSI reporting MAC control element (CE).
  • CE sidelink CSI reporting MAC control element
  • the sidelink CSI reporting MAC CE may be identified by a MAC subheader with logical channel ID (LCID).
  • LCID logical channel ID
  • the priority of the sidelink CSI reporting MAC CE may be fixed to '1'.
  • the sidelink CSI reporting MAC CE is defined as follows:
  • This field indicates the derived value of the rank indicator for sidelink CSI reporting.
  • the length of the field is 1 bit;
  • This field indicates the derived value of the channel quality indicator for sidelink CSI reporting.
  • the length of the field is 4 bit;
  • FIG. 10 shows an example of a method for performing sidelink communication for a UE to which the technical features of the present disclosure can be applied.
  • the first UE may establish a connection with network (e.g., gNB).
  • the first UE may perform initial access towards the cell.
  • the first UE and the cell may perform random access procedure.
  • the first UE may establish and/or resume a connection with the network and enters RRC_CONNECTED.
  • the first UE may perform AS security activation upon receiving security mode command from the network.
  • the first UE may configure radio bearers and radio configuration upon receiving RRC reconfiguration and/or resumes radio bearers and radio configuration upon receiving RRC resume.
  • the first UE may be configured with a SCI period for management of the direct link by the network and/or pre-configuration.
  • step S1002 the first UE and the second UE, e.g., RX UE, establish PC5-RRC connection.
  • step S1004 the first UE establishes a direct link with the second UE for sidelink unicast transmission and/or for sidelink groupcast transmission.
  • one or more resource pools may be configured for sidelink transmissions on the direct link.
  • the resource pools may be configured on the same BWP of the same carrier, different BWPs of the same carrier, and/or different carriers.
  • the resource pools may be associated with the direct link, e.g., with a pair of a source ID and destination ID, and/or a link ID.
  • the first UE may inform the second UE about configuration of the SCI period.
  • step S1008 the second UE starts PC5 RLM.
  • step S1010 the first UE transmits SCI to the second UE.
  • the SCI may indicate link ID.
  • the SCI may indicate a certain SCI period, e.g., the next SCI period. During the indicated SCI period, if data is not available for STCH associated with one of the resource pools, the first UE may not transmit a SCI.
  • the SCI may indicate time duration which starts from the SCI transmission or transmission of a MAC PDU indicated by the SCI. During the time duration, if data is not available for STCH associated with one of the resource pools, the first UE may not transmit a SCI.
  • step S1012 the first UE transmits a SL-SCH to the second UE.
  • the SL-SCH may be scheduled by the SCI.
  • the first UE may transmit SCI and a MAC PDU on the SL-SCH to the second UE via at least one resource pool.
  • the first UE may transmit multiple SCIs and multiple MAC PDUs to the second UE on the SL-SCH.
  • Each MAC PDU may be indicated and scheduled based on the SCI.
  • the first UE may transmit the SCI and a MAC PDU on the SL-SCH based on the SCI by using the resource.
  • the HARQ entity of the first UE may trigger the transmission of the SCI and a MAC PDU for a HARQ process.
  • different SCIs transmitted to the second UE may indicate different IDs of the same ID type.
  • different SCIs may indicate different source layer-2 IDs, different destination layer-2 IDs, and/or different link IDs. But, different IDs may be associated with the direct link between the first UE and the second UE.
  • the ID may be a particular ID indicating PC5 RLM or no SCI transmission.
  • the first UE may start a timer for a SCI period. Upon expiry of the timer, the first UE may restart a timer for a next SCI period. In FIG. 18, the timer starts upon transmission of the first SCI to the second UE.
  • the second UE may consider the SCI transmission for management of the direct link.
  • the second UE may not transmit HARQ feedback to the first UE.
  • the second UE may start a timer for a SCI period. Upon expiry of the timer, the first UE may restart a timer for a next SCI period.
  • the second UE determines either in-sync and/or out-of-sync based on each of the SCIs and provides each indication to an upper layer of the second UE for every SCI period, e.g., whenever the timer expires.
  • the second UE may determine out-of-sync for the SCI period. Alternatively, in this case the second UE may determine in-sync for the SCI period.
  • the second UE may determine in-sync for the indicated SCI period if the second UE receives a SCI which indicates a certain SCI period, e.g., the next SCI period, and if any SCI is not received for the indicated SCI period.
  • the second UE may start the time duration from the SCI transmission or transmission of a MAC PDU indicated by the SCI. During the time duration, if any SCI is not received for time duration, the second UE may determine in-sync for the time duration.
  • the upper layer (e.g., RRC layer) of the second UE may determine whether link failure occurs or not for the direct link if a certain number of out-of-sync indications occur consecutively.
  • the second UE may indicate the number of out-of-sync indications to the first UE and/or the network.
  • the second UE may consider the direct link is released.
  • step S1016 the data is available for link ID in the first UE.
  • step S1018 the first UE transmits SCI to the second UE.
  • the SCI may indicate the link ID.
  • step S1020 the first UE transmits a SL-SCH to the second UE.
  • the SL-SCH may be scheduled by the SCI.
  • the second UE determines either in-sync and/or out-of-sync based on each of the SCIs and provides each indication to an upper layer of the second UE for every SCI period, e.g., whenever the timer expires.
  • step S1024 data is not available for link ID in the first UE.
  • step S1026 if data is not available for any STCH associated with one of the resource pools, and if a resource has been not reserved on any of the resource pools within the SCI period after the latest SCI transmission, the first UE triggers SL resource reservation procedure for a SCI transmission in which the UE reserves at least one resource on one of the resource pools associated with the direct link by associating a particular priority to this SCI transmission.
  • step S1028 the first UE transmits SCI to the second UE.
  • the SCI may indicate the link ID and/or no data transmission.
  • the particular priority may be a priority configured by the network and/or pre-configuration.
  • the particular priority may be a certain fixed priority for this type of SCI transmission (i.e., for PC5 RLM or for no SL-SCH transmission).
  • the particular priority may be the highest priority and/or the lowest priority.
  • the SCI may indicate the particular priority to the RX UE.
  • the HARQ entity of the first UE may trigger transmission of the SCI without triggering SL-SCH transmission.
  • the SCI may indicate PC5 RLM, no SL-SCH transmission and/or no HARQ feedback.
  • the SCI may indicate a particular ID which is used to indicate PC5 RLM, no SL-SCH transmission and/or no HARQ feedback.
  • the particular ID may be one of the IDs associated with the direct link, e.g., the source layer-2 ID, the destination layer-2 ID and/or the link ID.
  • the UE may reserve a new resource on any of the resource pools within the SCI period after the latest SCI transmission for a certain MAC PDU. If the new resource is reserved for a certain MAC PDU, the UE may cancel the previously reserved resource for this SCI transmission and/or stops this SCI transmission.
  • the first UE may transmit the SCI by using the resource and may skip SL-SCH transmission indicated by the SCI.
  • the HARQ entity of the first UE may trigger transmission of the SCI without triggering SL-SCH transmission.
  • the SCI may indicate PC5 RLM, no SL-SCH transmission and/or no HARQ feedback.
  • the SCI may indicate a particular ID which is used to indicate PC5 RLM, no SL-SCH transmission and/or no HARQ feedback.
  • the particular ID may be one of the IDs associated with the direct link, e.g., the source layer-2 ID, the destination layer-2 ID, and/or the link ID.
  • the first UE may transmit the SCI and SL-SCH transmission by using the resource.
  • the HARQ entity of the first UE may create a MAC PDU having no MAC SDU and trigger transmission of the MAC PDU on the SL-SCH based on the SCI.
  • the MAC PDU may include a MAC header indicating one of the IDs, PC5 RLM and/or no SL data without MAC SDU.
  • the MAC PDU may include a MAC header indicating a MAC CE indicating one of the IDs, PC5 RLM and/or no SL data.
  • the MAC header may include the particular LCID value allocated for no SL data or SCI only transmission.
  • the MAC header may include the particular source (SRC) value and the particular destination (DST) value allocated for no SL data or SCI only transmission.
  • step S1030 the second UE determines either in-sync and/or out-of-sync based on each of the SCIs and provides each indication to an upper layer of the second UE for every SCI period, e.g., whenever the timer expires.
  • SCI may be replaced by a reference signal and/or any type of a physical channel for PC5 RLM.
  • sidelink resource allocation may be performed as follows.
  • the TX UE may transmit sidelink UE information to the network.
  • the sidelink UE information may include at least one of the followings: traffic pattern of service A, TX carriers and/or RX carriers mapped to service A, QoS information related to service A (e.g., 5QI, PPPP, PPPR, QCI value), service type of service A (e.g., unicast, groupcast, broadcast) and destination related to service A and/or another UE (e.g., destination ID, destination index or UE ID mapped to service A and/or the another UE).
  • QoS information related to service A e.g., 5QI, PPPP, PPPR, QCI value
  • service type of service A e.g., unicast, groupcast, broadcast
  • destination related to service A and/or another UE e.g., destination ID, destination index or UE ID mapped to service A and/or the another UE.
  • the network may construct sidelink configuration.
  • the sidelink configuration may include at least one of the followings: one or more resource pools for service A and/or unicast transmission with another UE and Sidelink buffer status report (BSR) configuration such as mapping between a logical channel group (LCG) and one or more QoS values or mapping between a LCG and the service type of Service A.
  • BSR Sidelink buffer status report
  • the network may signal the sidelink configuration to the TX UE and then the TX UE may configure lower layers with sidelink configuration.
  • the TX UE may trigger scheduling request (SR) for sidelink signaling (e.g., a particular PSCCH or sidelink connection establishment), so that the TX UE transmits PUCCH resource mapped to sidelink signaling. If PUCCH resource is not configured, the TX UE may perform random access procedure as the scheduling request. If an uplink grant is given at a result of the SR, the TX UE may transmit sidelink BSR to the network.
  • the sidelink BSR may indicate at least a destination index or UE Index, a LCG, and a buffer size corresponding to the destination service, the destination group or the destination UE.
  • the destination index may address the destination service, the destination group or the destination UE.
  • the UE index may address the destination/RX UE.
  • the network may transmit a sidelink grant to the TX UE, e.g., by sending DCI in PDCCH.
  • the DCI may include an allocated sidelink resource, the destination index and/or UE index.
  • the index may be used to indicate the service A and/or the RX UE, explicitly or implicitly. If the TX UE receives the DCI, the TX UE may use the sidelink grant for transmission to the TX UE.
  • the TX UE may autonomously select or reselect sidelink resources to create a sidelink grant used for transmission to the RX UE.
  • the present disclosure may be applied to various future technologies, such as AI.
  • AI refers to artificial intelligence and/or the field of studying methodology for making it.
  • Machine learning is a field of studying methodologies that define and solve various problems dealt with in AI.
  • Machine learning may be defined as an algorithm that enhances the performance of a task through a steady experience with any task.
  • An artificial neural network is a model used in machine learning. It can mean a whole model of problem-solving ability, consisting of artificial neurons (nodes) that form a network of synapses.
  • An ANN can be defined by a connection pattern between neurons in different layers, a learning process for updating model parameters, and/or an activation function for generating an output value.
  • An ANN may include an input layer, an output layer, and optionally one or more hidden layers. Each layer may contain one or more neurons, and an ANN may include a synapse that links neurons to neurons.
  • each neuron can output a summation of the activation function for input signals, weights, and deflections input through the synapse.
  • Model parameters are parameters determined through learning, including deflection of neurons and/or weights of synaptic connections.
  • the hyper-parameter means a parameter to be set in the machine learning algorithm before learning, and includes a learning rate, a repetition number, a mini batch size, an initialization function, etc.
  • the objective of the ANN learning can be seen as determining the model parameters that minimize the loss function.
  • the loss function can be used as an index to determine optimal model parameters in learning process of ANN.
  • Machine learning can be divided into supervised learning, unsupervised learning, and reinforcement learning, depending on the learning method.
  • Supervised learning is a method of learning ANN with labels given to learning data. Labels are the answers (or result values) that ANN must infer when learning data is input to ANN.
  • Unsupervised learning can mean a method of learning ANN without labels given to learning data.
  • Reinforcement learning can mean a learning method in which an agent defined in an environment learns to select a behavior and/or sequence of actions that maximizes cumulative compensation in each state.
  • Machine learning which is implemented as a deep neural network (DNN) that includes multiple hidden layers among ANN, is also called deep learning. Deep learning is part of machine learning. In the following, machine learning is used to mean deep learning.
  • DNN deep neural network
  • FIG. 11 shows an example of an AI device to which the technical features of the present disclosure can be applied.
  • the AI device 1100 may be implemented as a stationary device or a mobile device, such as a TV, a projector, a mobile phone, a smartphone, a desktop computer, a notebook, a digital broadcasting terminal, a PDA, a PMP, a navigation device, a tablet PC, a wearable device, a set-top box (STB), a digital multimedia broadcasting (DMB) receiver, a radio, a washing machine, a refrigerator, a digital signage, a robot, a vehicle, etc.
  • a stationary device such as a TV, a projector, a mobile phone, a smartphone, a desktop computer, a notebook, a digital broadcasting terminal, a PDA, a PMP, a navigation device, a tablet PC, a wearable device, a set-top box (STB), a digital multimedia broadcasting (DMB) receiver, a radio, a washing machine, a refrigerator, a digital signage, a robot, a vehicle, etc.
  • DMB digital
  • the AI device 1100 may include a communication part 1110, an input part 1120, a learning processor 1130, a sensing part 1140, an output part 1150, a memory 1160, and a processor 1170.
  • the communication part 1110 can transmit and/or receive data to and/or from external devices such as the AI devices and the AI server using wire and/or wireless communication technology.
  • the communication part 1110 can transmit and/or receive sensor information, a user input, a learning model, and a control signal with external devices.
  • the communication technology used by the communication part 1110 may include a global system for mobile communication (GSM), a code division multiple access (CDMA), an LTE/LTE-A, a 5G, a WLAN, a Wi-Fi, Bluetooth TM , radio frequency identification (RFID), infrared data association (IrDA), ZigBee, and/or near field communication (NFC).
  • GSM global system for mobile communication
  • CDMA code division multiple access
  • LTE/LTE-A Long Term Evolution
  • 5G Fifth Generation
  • WLAN Fifth Generation
  • Wi-Fi Wireless Fidelity
  • Bluetooth TM Bluetooth TM
  • RFID radio frequency identification
  • IrDA infrared data association
  • ZigBee ZigBe
  • the input part 1120 can acquire various kinds of data.
  • the input part 1120 may include a camera for inputting a video signal, a microphone for receiving an audio signal, and a user input part for receiving information from a user.
  • a camera and/or a microphone may be treated as a sensor, and a signal obtained from a camera and/or a microphone may be referred to as sensing data and/or sensor information.
  • the input part 1120 can acquire input data to be used when acquiring an output using learning data and a learning model for model learning.
  • the input part 1120 may obtain raw input data, in which case the processor 1170 or the learning processor 1130 may extract input features by preprocessing the input data.
  • the learning processor 1130 may learn a model composed of an ANN using learning data.
  • the learned ANN can be referred to as a learning model.
  • the learning model can be used to infer result values for new input data rather than learning data, and the inferred values can be used as a basis for determining which actions to perform.
  • the learning processor 1130 may perform AI processing together with the learning processor of the AI server.
  • the learning processor 1130 may include a memory integrated and/or implemented in the AI device 1100. Alternatively, the learning processor 1130 may be implemented using the memory 1160, an external memory directly coupled to the AI device 1100, and/or a memory maintained in an external device.
  • the sensing part 1140 may acquire at least one of internal information of the AI device 1100, environment information of the AI device 1100, and/or the user information using various sensors.
  • the sensors included in the sensing part 1140 may include a proximity sensor, an illuminance sensor, an acceleration sensor, a magnetic sensor, a gyro sensor, an inertial sensor, an RGB sensor, an IR sensor, a fingerprint recognition sensor, an ultrasonic sensor, an optical sensor, a microphone, a light detection and ranging (LIDAR), and/or a radar.
  • the output part 1150 may generate an output related to visual, auditory, tactile, etc.
  • the output part 1150 may include a display unit for outputting visual information, a speaker for outputting auditory information, and/or a haptic module for outputting tactile information.
  • the memory 1160 may store data that supports various functions of the AI device 1100.
  • the memory 1160 may store input data acquired by the input part 1120, learning data, a learning model, a learning history, etc.
  • the processor 1170 may determine at least one executable operation of the AI device 1100 based on information determined and/or generated using a data analysis algorithm and/or a machine learning algorithm. The processor 1170 may then control the components of the AI device 1100 to perform the determined operation. The processor 1170 may request, retrieve, receive, and/or utilize data in the learning processor 1130 and/or the memory 1160, and may control the components of the AI device 1100 to execute the predicted operation and/or the operation determined to be desirable among the at least one executable operation. The processor 1170 may generate a control signal for controlling the external device, and may transmit the generated control signal to the external device, when the external device needs to be linked to perform the determined operation.
  • the processor 1170 may obtain the intention information for the user input and determine the user's requirements based on the obtained intention information.
  • the processor 1170 may use at least one of a speech-to-text (STT) engine for converting speech input into a text string and/or a natural language processing (NLP) engine for acquiring intention information of a natural language, to obtain the intention information corresponding to the user input.
  • STT speech-to-text
  • NLP natural language processing
  • At least one of the STT engine and/or the NLP engine may be configured as an ANN, at least a part of which is learned according to a machine learning algorithm.
  • At least one of the STT engine and/or the NLP engine may be learned by the learning processor 1130 and/or learned by the learning processor of the AI server, and/or learned by their distributed processing.
  • the processor 1170 may collect history information including the operation contents of the AI device 1100 and/or the user's feedback on the operation, etc.
  • the processor 1170 may store the collected history information in the memory 1160 and/or the learning processor 1130, and/or transmit to an external device such as the AI server.
  • the collected history information can be used to update the learning model.
  • the processor 1170 may control at least some of the components of AI device 1100 to drive an application program stored in memory 1160. Furthermore, the processor 1170 may operate two or more of the components included in the AI device 1100 in combination with each other for driving the application program.
  • FIG. 12 shows an example of an AI system to which the technical features of the present disclosure can be applied.
  • an AI server 1220 a robot 1210a, an autonomous vehicle 1210b, an XR device 1210c, a smartphone 1210d and/or a home appliance 1210e is connected to a cloud network 1200.
  • the robot 1210a, the autonomous vehicle 1210b, the XR device 1210c, the smartphone 1210d, and/or the home appliance 1210e to which the AI technology is applied may be referred to as AI devices 1210a to 1210e.
  • the cloud network 1200 may refer to a network that forms part of a cloud computing infrastructure and/or resides in a cloud computing infrastructure.
  • the cloud network 1200 may be configured using a 3G network, a 4G or LTE network, and/or a 5G network. That is, each of the devices 1210a to 1210e and 1220 consisting the AI system may be connected to each other through the cloud network 1200.
  • each of the devices 1210a to 1210e and 1220 may communicate with each other through a base station, but may directly communicate with each other without using a base station.
  • the AI server 1220 may include a server for performing AI processing and a server for performing operations on big data.
  • the AI server 1220 is connected to at least one or more of AI devices constituting the AI system, i.e., the robot 1210a, the autonomous vehicle 1210b, the XR device 1210c, the smartphone 1210d and/or the home appliance 1210e through the cloud network 1200, and may assist at least some AI processing of the connected AI devices 1210a to 1210e.
  • the AI server 1220 can learn the ANN according to the machine learning algorithm on behalf of the AI devices 1210a to 1210e, and can directly store the learning models and/or transmit them to the AI devices 1210a to 1210e.
  • the AI server 1220 may receive the input data from the AI devices 1210a to 1210e, infer the result value with respect to the received input data using the learning model, generate a response and/or a control command based on the inferred result value, and transmit the generated data to the AI devices 1210a to 1210e.
  • the AI devices 1210a to 1210e may directly infer a result value for the input data using a learning model, and generate a response and/or a control command based on the inferred result value.
  • the AI devices 1210a to 1210e to which the technical features of the present disclosure can be applied will be described.
  • the AI devices 1210a to 1210e shown in FIG. 12 can be seen as specific embodiments of the AI device 1100 shown in FIG. 11.
  • the present disclosure can have various advantageous effects.
  • a UE can transmit control information (e.g., SCI) for sidelink management with appropriate priority.
  • control information e.g., SCI
  • a UE can reserve a resource and transmit control information (e.g., SCI) for a direct link with other UE, in particular when the UE has no data to be transmitted to the other UE.
  • control information e.g., SCI
  • the system can reliably manage a direct link between two UEs performing sidelink communication.

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  • Computer Networks & Wireless Communication (AREA)
  • Signal Processing (AREA)
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Abstract

L'invention concerne un procédé et un appareil de gestion de liaison latérale à l'aide d'informations de commande de liaison latérale (SCI) et d'attribution de ressources dans un système de communication sans fil. Un premier dispositif sans fil détermine que des données ne sont pas disponibles pour un canal logique, détermine une priorité pour la transmission d'informations de commande de liaison latérale (SCI), et transmet, à un second dispositif sans fil, les SCI comprenant la priorité.
PCT/KR2020/005839 2019-05-02 2020-05-04 Gestion de liaison latérale à l'aide d'informations de commande de liaison latérale et d'attribution de ressources WO2020222595A1 (fr)

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WO2022098208A1 (fr) * 2020-11-09 2022-05-12 엘지전자 주식회사 Procédé et appareil de réalisation d'une opération de réévaluation de ressources dans un système nr v2x
CN116325827A (zh) * 2020-12-30 2023-06-23 Oppo广东移动通信有限公司 设置方法、终端设备和网络设备
WO2022179496A1 (fr) * 2021-02-26 2022-09-01 Telefonaktiebolaget Lm Ericsson (Publ) Dispositif terminal, nœud de réseau et procédés à l'intérieur de celui-ci pour une configuration drx

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