WO2022231245A1 - 무선 통신 시스템에서 e2 노드 제어를 위한 장치 및 방법 - Google Patents
무선 통신 시스템에서 e2 노드 제어를 위한 장치 및 방법 Download PDFInfo
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Definitions
- the present disclosure relates to an apparatus and method for E2 node control by RIC in a radio access network.
- the present disclosure relates to an apparatus and method for controlling an E2 node through an E2 message conforming to an open radio access network (O-RAN) standard of a wireless communication system.
- OF-RAN open radio access network
- the 5G communication system or the pre-5G communication system is called a 4G network after (Beyond 4G Network) communication system or an LTE (Long Term Evolution) system after (Post LTE) system.
- the 5G communication system is being considered for implementation in a very high frequency (mmWave) band (eg, such as a 60 gigabyte (60 GHz) band).
- mmWave very high frequency
- FD-MIMO Full Dimensional MIMO
- array antenna, analog beam-forming, and large scale antenna technologies are being discussed.
- an evolved small cell in the 5G communication system, an evolved small cell, an advanced small cell, a cloud radio access network (cloud radio access network, cloud RAN), an ultra-dense network (ultra-dense network) , Device to Device communication (D2D), wireless backhaul, moving network, cooperative communication, Coordinated Multi-Points (CoMP), and reception interference cancellation (interference cancellation) Technology development is underway.
- cloud radio access network cloud radio access network
- ultra-dense network ultra-dense network
- D2D Device to Device communication
- wireless backhaul moving network
- cooperative communication Coordinated Multi-Points (CoMP), and reception interference cancellation (interference cancellation) Technology development is underway.
- CoMP Coordinated Multi-Points
- FQAM Hybrid Frequency Shift Keying and Quadrature Amplitude Modulation
- SWSC Sliding Window Superposition Coding
- ACM Advanced Coding Modulation
- FBMC Filter Bank Multi Carrier
- NOMA Non Orthogonal Multiple Access
- SCMA Sparse Code Multiple Access
- the 5G system To meet the demand for wireless data traffic, the 5G system, NR (new radio or next radio), has been commercialized, providing high data rate services to users through the 5G system like 4G, and also for the Internet of Things and specific purposes. It is expected that wireless communication services for various purposes, such as services requiring high reliability, can be provided.
- O-RAN open radio access network
- O-RAN open radio access network
- the present disclosure provides an apparatus and method for a radio access network (RAN) intelligent controller (RIC) to perform control of an E2 node in a wireless communication system.
- RAN radio access network
- RIC radio controller
- the present disclosure also provides an apparatus and method for setting an E2 node by the RIC to a specific mode such that the E2 node operates under the control of the RIC.
- a method performed by a radio access network (RAN) intelligent controller includes a process of receiving a report message from an E2 node, a process of generating a control message based on the report message, and , transmitting the control message to the E2 node, the control message includes a RAN configuration related to the E2 node, and the report message is a UE assistance transmitted from a user equipment (UE). It may include at least one of UE assistance information and UE expected behavior related information transmitted from an Access and Mobility Management Function (AMF).
- AMF Access and Mobility Management Function
- the method performed by the E2 node includes transmitting a report message to a radio access network (RAN) intelligent controller (RIC) and receiving a control message generated based on the report message from the E2 node, and , the control message includes a RAN configuration related to the E2 node, and the report message includes UE assistance information and Access and Mobility Management Function (AMF) transmitted from user equipment (UE). It may include at least one of UE expected behavior-related information transmitted from RAN
- RAN radio access network
- RIC radio access network intelligent controller
- AMF Access and Mobility Management Function
- a device of a radio access network (RAN) intelligent controller includes at least one transceiver and at least one processor, the at least one transceiver to receive a report message from an E2 node. control, generate a control message based on the report message, and control the at least one transceiver to transmit the control message to the E2 node, wherein the control message includes a RAN configuration associated with the E2 node.
- the report message may include at least one of UE assistance information transmitted from user equipment (UE) and UE expected behavior related information transmitted from Access and Mobility Management Function (AMF). .
- an apparatus performed by an E2 node includes at least one transceiver and at least one processor, wherein the at least one processor is a radio access network (RAN) intelligent controller (RIC). transmits a report message to and controls the at least one transceiver to receive a control message generated based on the report message from the E2 node, wherein the control message includes a RAN configuration associated with the E2 node and, the report message may include at least one of UE assistance information transmitted from user equipment (UE) and information related to expected UE behavior transmitted from Access and Mobility Management Function (AMF).
- UE user equipment
- AMF Access and Mobility Management Function
- the apparatus and method according to various embodiments of the present disclosure enable a radio access network (RAN) intelligent controller (RIC) to control the E2 node.
- RAN radio access network
- RIC radio controller
- FIG. 1 shows an example of a 4th generation (4G) Long Term Evolution (LTE) core system.
- 4G 4th generation
- LTE Long Term Evolution
- FIG. 2A shows an example of a 5th generation (5G) non-standard alone (NSA) system.
- 5G 5th generation
- NSA non-standard alone
- 2B shows an example of an architecture for O-RAN.
- FIG. 3 illustrates a protocol stack of an E2 application protocol message in a wireless access network according to various embodiments of the present disclosure.
- FIG. 4 illustrates an example of a connection between a base station and a radio access network intelligence controller (RIC) in a radio access network according to various embodiments of the present disclosure.
- RIC radio access network intelligence controller
- FIG. 5 illustrates a configuration of a device in a wireless access network according to various embodiments of the present disclosure.
- FIG. 6 illustrates logical functions related to an E2 message of an E2 node and an RIC in a radio access network according to various embodiments of the present disclosure.
- FIG. 7 illustrates examples of sharing UE Context or Cell Context information between a CU node and an RIC according to various embodiments of the present disclosure.
- FIG. 8 illustrates signaling for sharing Expected UE Behavior and UE assistance information information among UE context information between an E2 node and an RIC according to various embodiments of the present disclosure.
- FIG. 9 shows an example of information delivery through an AMF, a Core Network Assistance Information information element (IE) and a next generation application protocol (NGAP) UE Context Modification Request message to an O-CU-CP according to various embodiments of the present disclosure; .
- IE Core Network Assistance Information information element
- NGAP next generation application protocol
- FIG. 10 illustrates an example of information transfer by a UE through an RRC message of a UEAssistanceInformation IE to an O-CU-CP according to various embodiments of the present disclosure.
- FIG. 11 illustrates a subscription procedure and RIC indication signaling between an E2 node and an RIC according to embodiments of the present disclosure.
- FIG. 12 illustrates an example of a format of a RIC event trigger definition according to embodiments of the present disclosure.
- FIG. 13 shows an example of a format of a RIC indication header according to embodiments of the present disclosure.
- FIG. 14 illustrates examples of a format of an RIC indication message according to embodiments of the present disclosure.
- the present disclosure relates to an apparatus and method for performing a subscription procedure between a device in a radio access network (RAN) and a device controlling the RAN in a wireless communication system.
- the present disclosure relates to an apparatus and method for measuring performance for each terminal on an E2 interface in a radio access network, and resource management for each slice of a base station.
- the present disclosure relates to a container-based measurement message delivery apparatus and method when a service event for a base station conforming to an open radio access network (O-RAN) standard using an E2 message of a wireless communication system occurs.
- OF-RAN open radio access network
- an expression of greater than or less than may be used, but this is only a description for expressing an example. It's not about exclusion. Conditions described as 'more than' may be replaced with 'more than', conditions described as 'less than', and conditions described as 'more than and less than' may be replaced with 'more than and less than'.
- the present disclosure describes various embodiments using terms used in some communication standards (eg, 3rd Generation Partnership Project (3GPP), open radio access network (O-RAN)), but this is an example for description Various embodiments of the present disclosure may be easily modified and applied in other communication systems.
- 3GPP 3rd Generation Partnership Project
- OFDRAN open radio access network
- 3GPP is a joint research project between mobile communication-related organizations and aims to create a 3G mobile communication system standard - applicable worldwide - within the scope of the IMT-2000 project of the International Telecommunication Union (ITU). 3GPP was established in December 1998, and the 3GPP standard is based on the advanced GSM standard, and includes radio, core network, and service architecture all in the scope of standardization.
- an open radio access network is a 3GPP NE (network entity) and nodes constituting a base station, RU (radio unit), DU (digital unit), CU (central unit)-CP (control plane) ) and CU-UP (user plane) are newly defined as O(O-RAN)-RU, O-DU, O-CU-CP, and O-CU-UP, respectively, and additionally NRT (near-real- time) RIC (radio access network intelligent controller) was standardized.
- the present disclosure is to support an operator specific service model in the E2 interface where the RIC requests a service from the O-DU, O-CU-CP, or O-CU-UP.
- O-RU, O-DU, O-CU-CP, and O-CU-UP may be understood as objects constituting a RAN that can operate according to the O-RAN standard, and as an E2 node (node). may be referred to.
- An interface with objects constituting the RAN that can operate according to the O-RAN standard between the RIC and E2 nodes uses an E2AP (application protocol).
- the RIC is a logical node capable of collecting information on a cell site transmitted/received between the UE and the O-DU, O-CU-CP, or O-CU-UP.
- RIC may be implemented in the form of a server centrally located in one physical location. Connections can be made through Ethernet between O-DU and RIC, between O-CU-CP and RIC, and between O-CU-UP and RIC. For this, interface standards for communication between O-DU and RIC, between O-CU-CP and RIC, and between O-CU-UP and RIC were required, and E2-DU, E2-CU-CP, E2-CU- The definition of message standards such as UP and procedures between O-DU, O-CU-CP, O-CU-UP and RIC is required.
- differentiated service support is required for users in a virtualized network, and by concentrating call processing messages/functions generated in O-RAN on RIC, E2-DU to support services for a wide range of cell coverage, It is necessary to define the function of the messages of E2-CU-CP and E2-CU-UP.
- the RIC may communicate with the O-DU, O-CU-CP, and O-CU-UP using the E2 interface, and may set an event generation condition by generating and transmitting a subscription message. Specifically, the RIC generates an E2 subscription request message and transmits an E2 subscription request message to an E2 node (eg, O-CU-CP, O-CU-UP, O-DU). You can set the processing event. In addition, after setting the EVENT, the E2 node transmits the Subscription Request Response message delivered to the RIC.
- E2 node eg, O-CU-CP, O-CU-UP, O-DU.
- the E2 node may transmit the current state to the RIC through an E2 indication/report.
- the RIC may provide control for O-DU, O-CU-CP, and O-CU-UP using an E2 control message.
- Various embodiments of the present disclosure propose an E2 indication message for transmitting UE-unit measurement information for each period set in a subscription event condition in O-DU.
- various embodiments of the present disclosure propose a message for controlling a resource transmitted from the RIC to the O-DU.
- FIG. 1 shows an example of a 4th generation (4G) Long Term Evolution (LTE) core system.
- 4G 4th generation
- LTE Long Term Evolution
- the LTE core system includes a base station 110 , a terminal 120 , a serving gateway (S-GW) 130 , a packet data network gateway (P-GW) 140 , and a mobility management entity (MME). 150 , a home subscriber server (HSS) 160 , and a policy and charging rule function (PCRF) 170 .
- S-GW serving gateway
- P-GW packet data network gateway
- MME mobility management entity
- HSS home subscriber server
- PCRF policy and charging rule function
- the base station 110 is a network infrastructure that provides a wireless connection to the terminal 120 .
- the base station 110 is a device that performs scheduling by collecting state information such as a buffer state, available transmission power, and channel state of the terminal 110 .
- the base station 110 has coverage defined as a certain geographic area based on a distance capable of transmitting a signal.
- the base station 110 is connected to the MME 150 through an S1-MME interface.
- the base station 110 is an 'access point (AP)', an 'eNodeB (eNodeB)', a 'wireless point', a 'transmission/reception point, TRP)' or other terms having an equivalent technical meaning may be referred to.
- AP 'access point
- eNodeB eNodeB
- TRP 'transmission/reception point
- the terminal 120 is a device used by a user and performs communication with the base station 110 through a wireless channel. In some cases, the terminal 120 may be operated without the user's involvement. That is, at least one of the terminal 120 and the terminal 130 is a device that performs machine type communication (MTC) and may not be carried by the user.
- the terminal 120 is a terminal other than 'user equipment (UE)', 'mobile station', 'subscriber station', customer-premises equipment (CPE) ' It may be referred to as a 'remote terminal', 'wireless terminal', or 'user device' or other terms having an equivalent technical meaning.
- the S-GW 130 provides a data bearer, and creates or controls the data bearer according to the control of the MME 150 .
- the S-GW 130 processes a packet arriving from the base station 110 or a packet to be forwarded to the base station 110 .
- the S-GW 130 may perform an anchoring role during handover between base stations of the terminal 120 .
- the P-GW 140 may function as a connection point with an external network (eg, an Internet network).
- the P-GW 140 allocates an Internet Protocol (IP) address to the terminal 120 and serves as an anchor for the S-GW 130 .
- the P-GW 140 may apply the QoS (Quality of Service) policy of the terminal 120 and manage account data.
- IP Internet Protocol
- the MME 150 manages the mobility of the terminal 120 .
- the MME 150 may perform authentication for the terminal 120 , bearer management, and the like. That is, the MME 150 is in charge of mobility management and various control functions for the terminal.
- the MME 150 may interwork with a serving GPRS support node (SGSN).
- SGSN serving GPRS support node
- the HSS 160 stores key information and a subscriber profile for authentication of the terminal 120 .
- the key information and the subscriber profile are transmitted from the HSS 160 to the MME 150 when the terminal 120 accesses the network.
- the PCRF 170 defines a rule for policy and charging.
- the stored information is transferred from the PCRF 180 to the P-GW 140, and the P-GW 140 controls the terminal 120 based on the information provided from the PCRF 180 (eg, QoS management, charging, etc.). ) can be done.
- a carrier aggregation (hereinafter, 'CA') technology a plurality of component carriers are combined, and one terminal transmits and receives a signal using the plurality of component carriers at the same time. It is a technology that increases the efficiency of use.
- the terminal and the base station can transmit and receive signals using wideband using a plurality of component carriers in uplink (UL) and downlink (DL), respectively, and in this case, each component carrier is different from each other. located in the frequency band.
- the uplink refers to a communication link in which the terminal transmits a signal to the base station
- the downlink refers to a communication link in which the base station transmits a signal to the terminal.
- the number of uplink component carriers and downlink component carriers may be different from each other.
- one terminal is connected to a plurality of different base stations and transmits and receives signals simultaneously using carriers in each of a plurality of base stations located in different frequency bands. It is a technology to increase the frequency use efficiency of The terminal provides a service using a first base station (eg, a base station that provides services using LTE technology or 4G mobile communication technology) and a second base station (eg, NR (new radio) technology or 5G (5th generation) mobile communication technology). It can transmit and receive traffic by being simultaneously connected to the base station that provides it. In this case, the frequency resources used by each base station may be located in different bands.
- NSA non-standalone
- 2A shows an example of a 5G NSA system.
- the 5G NSA system includes an NR RAN 210a , an LTE RAN 210b , a terminal 220 , and an EPC 250 .
- the NR RAN 210a and the LTE RAN 210b are connected to the EPC 150, and the terminal 220 may receive a service from any one or both of the NR RAN 210a and the LTE RAN 210b at the same time.
- the NR RAN 210a includes at least one NR base station
- the LTE RAN 210b includes at least one LTE base station.
- the NR base station may be referred to as a '5G node (5th generation node)', a 'next generation nodeB (gNB)', or other terms having an equivalent technical meaning.
- the NR base station may have a structure divided into a CU (central unit) and a DU (digital unit), and the CU has a structure separated into a CU-CP (control plane) unit and a CU-UP (user plane) unit.
- CU-CP control plane
- CU-UP user plane
- the terminal 220 performs radio resource control (RRC) access through a first base station (eg, a base station belonging to the LTE RAN 210b), and functions provided in a control plane. (eg, connection management, mobility management, etc.) can be serviced.
- RRC radio resource control
- the terminal 220 may be provided with an additional radio resource for transmitting and receiving data through the second base station (eg, a base station belonging to the NR RAN 210a).
- This dual connectivity technology using LTE and NR may be referred to as EN-DC (evolved universal terrestrial radio access (E-UTRA) - NR dual connectivity).
- EN-DC evolved universal terrestrial radio access
- NR-E-UTRA dual connectivity a dual connectivity technology in which a first base station uses NR technology and a second base station uses LTE technology is referred to as NR-E-UTRA dual connectivity (NE-DC).
- NE-DC NR-E-UTRA dual connectivity
- various embodiments may be applied to other various types of multi-connection and carrier aggregation technologies.
- various embodiments are applicable even when the first system using the first communication technology and the second system using the second communication technology are implemented in one device or when the first base station and the second base station are located in the same geographic location. can
- E2 node may be assumed to be in the O-RAN Stand Alone mode.
- E2-SM-KPIMON key performance indicator (KPI) monitoring
- the eNB in the deployment of the O-RAN non-standalone mode, the eNB is connected to the EPC through the S1-C/S1-U interface, and is connected to the O-CU-CP and the X2 interface.
- O-CU-CP for O-RAN standalone mode deployment (deployment) may be connected to the 5GC (5G core) through the N2 / N3 interface.
- the control plane includes a transport network layer and a radio network layer.
- the transport network layer includes a physical layer 310 , a data link layer 320 , an internet protocol (IP) 330 , and a stream control transmission protocol (SCTP) 340 .
- IP internet protocol
- SCTP stream control transmission protocol
- the radio network layer includes the E2AP (350).
- the E2AP 350 is used to deliver a subscription message, an indication message, a control message, a service update message, and a service query message, SCTP 340 and IP 330 are transmitted in a higher layer (higher layer).
- FIG. 4 illustrates an example of a connection between a base station and a radio access network intelligence controller (RIC) in a radio access network according to various embodiments of the present disclosure.
- RIC radio access network intelligence controller
- the RIC 440 is connected to the O-CU-CP 420 , the O-CU-UP 410 , and the O-DU 430 .
- RIC 440 is a device for customizing RAN functionality (functionality) for a new service or regional resource optimization (regional resource optimization).
- RIC 440 is a network intelligence (network intelligence) (eg, policy enforcement (policy enforcement), handover optimization (handover optimization)), resource assurance (resource assurance) (eg, radio-link management), improvement functions such as advanced self-organized-network (SON) and resource control (eg, load balancing, slicing policy) and the like.
- network intelligence network intelligence
- policy enforcement policy enforcement
- handover optimization handover optimization
- resource assurance resource assurance
- SON advanced self-organized-network
- resource control eg, load balancing, slicing policy
- the RIC 440 may communicate with the O-CU-CP 420 , the O-CU-UP 410 , and the O-DU 430 .
- the RIC 440 can be connected to each node through E2-CP, E2-UP, and E2-DU interfaces.
- E2-CP E2-CP
- E2-UP E2-UP
- E2-DU interface between the O-CU-CP and the DU and between the O-CU-UP and the DU
- F1 interface an interface between the O-CU-CP and the DU and between the O-CU-UP and the DU
- DU and O-DU, CU-CP and O-CU-CP, and CU-UP and O-CU-UP may be used interchangeably.
- a plurality of RICs may exist according to various embodiments.
- the plurality of RICs may be implemented as a plurality of hardware located in the same physical location or may be implemented through virtualization using one piece of hardware.
- FIG. 5 illustrates a configuration of an apparatus according to various embodiments of the present disclosure.
- the structure illustrated in FIG. 5 may be understood as a configuration of a device having at least one function among RIC, O-CU-CP, O-CU-UP, and O-DU of FIG. 5 .
- RIC RIC
- O-CU-CP O-CU-CP
- O-CU-UP O-CU-UP
- O-DU O-DU of FIG. 5
- '... wealth' '...
- 'group' means a unit for processing at least one function or operation, which may be implemented as hardware or software, or a combination of hardware and software.
- the core network device includes a communication unit 510 , a storage unit 520 , and a control unit 530 .
- the communication unit 510 provides an interface for performing communication with other devices in the network. That is, the communication unit 510 converts a bit string transmitted from the core network device to another device into a physical signal, and converts a physical signal received from the other device into a bit string. That is, the communication unit 510 may transmit and receive signals. Accordingly, the communication unit 510 may be referred to as a modem, a transmitter, a receiver, or a transceiver. In this case, the communication unit 510 enables the core network device to communicate with other devices or systems through a backhaul connection (eg, a wired backhaul or a wireless backhaul) or through a network.
- a backhaul connection eg, a wired backhaul or a wireless backhaul
- the storage unit 520 stores data such as a basic program, an application program, and setting information for the operation of the core network device.
- the storage unit 520 may be configured as a volatile memory, a non-volatile memory, or a combination of a volatile memory and a non-volatile memory.
- the storage unit 520 provides the stored data according to the request of the control unit 530 .
- the controller 530 controls overall operations of the core network device. For example, the control unit 530 transmits and receives a signal through the communication unit 510 . Also, the controller 530 writes and reads data in the storage 520 . To this end, the controller 530 may include at least one processor. According to various embodiments, the controller 530 may control the device to perform operations according to various embodiments described in the present disclosure.
- FIG. 6 illustrates logical functions related to an E2 message of an E2 node and an RIC in a radio access network according to various embodiments of the present disclosure.
- the RIC 640 and the E2 node 610 may transmit or receive an E2 message to each other.
- the E2 node 610 may be an O-CU-CP, an O-CU-UP, an O-DU, or a base station.
- the communication interface of the E2 node may be determined according to the type of the E2 node 610 .
- the E2 node 610 may communicate with another E2 node 616 through an E1 interface or an F1 interface.
- the E2 node 610 may communicate with the E2 node 616 through an X2 interface or an XN interface.
- the E2 node 610 performs communication through an S1 interface or a next generation application protocol (NGAP) interface (ie, an interface between a next generation (NG) RAN node and an Access and Mobility Management Function (AMF)).
- NGAP next generation application protocol
- AMF Access and Mobility Management Function
- the E2 node 610 may include an E2 node function 612 .
- the E2 node function 612 is a function corresponding to a specific xApp (application S/W) 646 installed in the RIC 640 .
- application S/W application S/W
- the KPI monitor collection S/W is installed in the RIC 640, and the E2 node 610 generates the KPI parameters and then sends the E2 message including the KPI parameters to the RIC ( E2 node function 612 forwarding to E2 termination 642 located at 640 .
- the E2 node 610 may include a radio resource management (RRM) 614 .
- the E2 node 610 may manage the resources provided to the wireless network for the terminal.
- the E2 end 642 located in the RIC 640 is the end of the RIC 640 for the E2 message. After interpreting the E2 message delivered by the E2 node 610, the E2 message is delivered to the xApp 646. perform the function A DB (database) 644 located in the RIC 640 may be used for the E2 end 624 or xApp 616 .
- the E2 node 610 illustrated in FIG. 6 is an end of at least one interface, and may be understood as an end of messages transmitted to a terminal, a neighboring base station, and a core network.
- Embodiments of the present disclosure propose a method of transmitting UE-related information transmitted from the core network to the E2 node and UE-related information transmitted from the UE through the RAN to the near-RT RIC through E2SM-RC REPORT.
- RIC may be near-RT RIC.
- the CU node is an O-CU, and stores UE Assistance information received through RRC of UEs and Core Network Assistance Information (Expected UE Behavior) of the UE received from AMF.
- the stored terminal information may be delivered to the RIC by the E2 REPORT message.
- the CU node may receive a UE Assistance information message from the UE.
- the CU node may receive a UE Assistance information message from higher layer signaling (eg, radio resource control (RRC) signaling).
- RRC radio resource control
- the UE Assistance information message may be used to indicate UE assistance information to the network.
- the signaling radio bearer It may be SRB1 or SRB3 'UEAssistanceInformation' of standard 3GPP TS 38.331 may be referred to.
- the UE Assistance information message may be configured as shown in Tables 1 and 2 below.
- ⁇ DRX-Preference-r16 SEQUENCE ⁇ preferredDRX-InactivityTimer-r16 ENUMERATED ⁇ ms0, ms1, ms2, ms3, ms4, ms5, ms6, ms8, ms10, ms20, ms30, ms40, ms50, ms60, ms80, ms100, ms200, ms300, ms500, ms750, ms1280, ms1920, ms2560, spare9, spare8, spare7, spare6, spare5, spare4, spare3, spare2, spare1 ⁇ OPTIONAL, preferredDRX-LongCycle-r16 ENUMERATED ⁇ ms10, ms20, ms32, ms40, ms60, ms64, ms70, ms80, ms128, ms160, ms256, ms320, ms512
- affectedCarrierFreqList Indicates a list of NR carrier frequencies that are affected by IDC problem.
- affectedCarrierFreqCombList Indicates a list of NR carrier frequency combinations that are affected by IDC problems due to Inter-Modulation Distortion and harmonics from NR when configured with UL CA.
- delayBudgetReport Indicates the UE-preferred adjustment to connected mode DRX.
- interferenceDirection Indicates the direction of IDC interference. Value nr indicates that only NR is victim of IDC interference, value other indicates that only another radio is victim of IDC interference and value both indicates that both NR and another radio are victims of IDC interference.
- the other radio refers to either the ISM radio or GNSS (see TR 36.816 [44]).
- minSchedulingOffsetPreference Indicates the UE's preferences on minimumSchedulingOffset of cross-slot scheduling for power saving.
- preferredDRX-InactivityTimer Indicates the UE's preferred DRX inactivity timer length for power saving. Value in ms (milliseconds). ms0 corresponds to 0, ms1 corresponds to 1 ms, ms2 corresponds to 2 ms, and so on. If the field is absent from the DRX-Preference IE, it is interpreted as the UE having no preference for the DRX inactivity timer.
- preferredDRX-InactivityTimer only applies to the default DRX group.
- preferredDRX-LongCycle Indicates the UE's preferred long DRX cycle length for power saving. Value in ms. ms10 corresponds to 10 ms, ms20 corresponds to 20 ms, ms32 corresponds to 32 ms, and so on. If preferredDRX-ShortCycle is provided, the value of preferredDRX-LongCycle shall be a multiple of the preferredDRX-ShortCycle value. If the field is absent from the DRX-Preference IE, it is interpreted as the UE having no preference for the long DRX cycle.
- preferredDRX-ShortCycle Indicates the UE's preferred short DRX cycle length for power saving. Value in ms. ms2 corresponds to 2ms, ms3 corresponds to 3 ms, ms4 corresponds to 4 ms, and so on. If the field is absent from the DRX-Preference IE, it is interpreted as the UE having no preference for the short DRX cycle.
- preferredDRX-ShortCycleTimer Indicates the UE's preferred short DRX cycle timer for power saving. Value in multiples of preferredDRX-ShortCycle .
- a value of 1 corresponds to preferredDRX-ShortCycle
- a value of 2 corresponds to 2 * preferredDRX-ShortCycle and so on.
- the field is absent from the DRX-Preference IE, it is interpreted as the UE having no preference for the short DRX cycle timer.
- a preference for the short DRX cycle is indicated when a preference for the short DRX cycle timer is indicated.
- preferredK0 Indicates the UE's preferred value of k0 (slot offset between DCI and its scheduled PDSCH - see TS 38.214 [19], clause 5.1.2.1) for cross-slot scheduling for power saving. Value is defined for each subcarrier spacing (numerology) in units of slots.
- sl1 corresponds to 1 slot
- sl2 corresponds to 2 slots
- sl4 corresponds to 4 slots, and so on.
- a value for a subcarrier spacing is absent, it is interpreted as the UE having no preference on k0 for cross-slot scheduling for that subcarrier spacing.
- the field is absent from the MinSchedulingOffsetPreference IE, it is interpreted as the UE having no preference on k0 for cross-slot scheduling.
- preferredK2 Indicates the UE's preferred value of k2 (slot offset between DCI and its scheduled PUSCH - see TS 38.214 [19], clause 6.1.2.1) for cross-slot scheduling for power saving.
- sl1 corresponds to 1 slot
- sl2 corresponds to 2 slots
- sl4 corresponds to 4 slots, and so on. If a value for a subcarrier spacing is absent, it is interpreted as the UE having no preference on k2 for cross-slot scheduling for that subcarrier spacing. If the field is absent from the MinSchedulingOffsetPreference IE, it is interpreted as the UE having no preference on k2 for cross-slot scheduling.
- preferredRRC-State Indicates the UE's preferred RRC state. The value idle is indicated if the UE prefers to be released from RRC_CONNECTED and transition to RRC_IDLE.
- the value inactive is indicated if the UE prefers to be released from RRC_CONNECTED and transition to RRC_INACTIVE.
- the value connected is indicated if the UE prefers to revert an earlier indication to leave RRC_CONNECTED state.
- the value outOfConnected is indicated if the UE prefers to be released from RRC_CONNECTED and has no preferred RRC state to transition to.
- the value connected can only be indicated if the UE is configured with connectedReporting .
- reducedBW-FR1 Indicates the UE's preference on reduced configuration corresponding to the maximum aggregated bandwidth across all downlink carrier(s) and across all uplink carrier(s) of FR1, to address overheating or power saving.
- the aggregated bandwidth across all downlink carrier(s) of FR1 is the sum of bandwidth of active downlink BWP(s) across all activated downlink carrier(s) of FR1.
- the aggregated bandwidth across all uplink carrier(s) of FR1 is the sum of bandwidth of active uplink BWP(s) across all activated uplink carrier(s) of FR1. If the field is absent from the MaxBW-Preference IE or the OverheatingAssistance IE, it is interpreted as the UE having no preference on the maximum aggregated bandwidth of FR1.
- this maximum aggregated bandwidth includes carrier(s) of FR1 of both the NR MCG and the SCG. This maximum aggregated bandwidth only includes carriers of FR1 of the SCG in (NG)EN-DC. Value mhz0 is not used when indicated to address overheating.
- this maximum aggregated bandwidth includes carrier(s) of FR1 of the cell group that this UE assistance information is associated with. The aggregated bandwidth can only range up to the current active configuration when indicated to address power savings.
- reducedBW-FR2 Indicates the UE's preference on reduced configuration corresponding to the maximum aggregated bandwidth across all downlink carrier(s) and across all uplink carrier(s) of FR2, to address overheating or power saving.
- the aggregated bandwidth across all downlink carrier(s) of FR2 is the sum of bandwidth of active downlink BWP(s) across all activated downlink carrier(s) of FR2.
- the aggregated bandwidth across all uplink carrier(s) of FR2 is the sum of bandwidth of active uplink BWP(s) across all activated uplink carrier(s) of FR2. If the field is absent from the MaxBW-Preference IE or the OverheatingAssistance IE, it is interpreted as the UE having no preference on the maximum aggregated bandwidth of FR2.
- this maximum aggregated bandwidth includes carrier(s) of FR2 of both the NR MCG and the NR SCG.
- This maximum aggregated bandwidth only includes carriers of FR2 of the SCG in (NG)EN-DC.
- this maximum aggregated bandwidth includes carrier(s) of FR2 of the cell group that this UE assistance information is associated with.
- the aggregated bandwidth can only range up to the current active configuration when indicated to address power savings.
- reducedCCsDL Indicates the UE's preference on reduced configuration corresponding to the maximum number of downlink SCells indicated by the field, to address overheating or power saving. When indicated to address overheating, this maximum number includes both SCells of the NR MCG and PSCell/SCells of the SCG.
- This maximum number only includes PSCell/SCells of the SCG in (NG)EN-DC.
- this maximum number includes PSCell/SCells of the cell group that this UE assistance information is associated with.
- the maximum number of downlink SCells can only range up to the current active configuration when indicated to address power savings.
- reducedCCsUL Indicates the UE's preference on reduced configuration corresponding to the maximum number of uplink SCells indicated by the field, to address overheating or power saving.
- this maximum number includes both SCells of the NR MCG and PSCell/SCells of the SCG. This maximum number only includes PSCell/SCells of the SCG in (NG)EN-DC.
- this maximum number When indicated to address power saving, this maximum number includes PSCell/SCells of the cell group that this UE assistance information is associated with.
- the maximum number of uplink SCells can only range up to the current active configuration when indicated to address power savings.
- reducedMIMO-LayersFR1-DL Indicates the UE's preference on reduced configuration corresponding to the maximum number of downlink MIMO layers of each serving cell operating on FR1 indicated by the field, to address overheating or power saving. This field is allowed to be reported only when UE is configured with serving cells operating on FR1.
- the maximum number of downlink MIMO layers can only range up to the maximum number of MIMO layers configured across all activated downlink carrier(s) of FR1 in the cell group when indicated to address power savings.
- reducedMIMO-LayersFR1-UL Indicates the UE's preference on reduced configuration corresponding to the maximum number of uplink MIMO layers of each serving cell operating on FR1 indicated by the field, to address overheating or power saving. This field is allowed to be reported only when UE is configured with serving cells operating on FR1.
- the maximum number of uplink MIMO layers can only range up to the maximum number of MIMO layers configured across all activated uplink carrier(s) of FR1 in the cell group when indicated to address power savings.
- reducedMIMO-LayersFR2-DL Indicates the UE's preference on reduced configuration corresponding to the maximum number of downlink MIMO layers of each serving cell operating on FR2 indicated by the field, to address overheating or power saving.
- This field is allowed to be reported only when UE is configured with serving cells operating on FR2.
- the maximum number of downlink MIMO layers can only range up to the maximum number of MIMO layers configured across all activated downlink carrier(s) of FR2 in the cell group when indicated to address power savings.
- reducedMIMO-LayersFR2-UL Indicates the UE's preference on reduced configuration corresponding to the maximum number of uplink MIMO layers of each serving cell operating on FR2 indicated by the field, to address overheating or power saving. This field is allowed to be reported only when UE is configured with serving cells operating on FR2.
- the maximum number of uplink MIMO layers can only range up to the maximum number of MIMO layers configured across all activated uplink carrier(s) of FR2 in the cell group when indicated to address power savings.
- referenceTimeInfoPreference Indicates whether the UE prefers being provisioned with the timing information specified in the IE ReferenceTimeInfo .
- sl-QoS-FlowIdentity This identity uniquely identifies one sidelink QoS flow between the UE and the network in the scope of UE, which is unique for different destination and cast type.
- sl-UE-AssistanceInformationNR Indicates the traffic characteristic of sidelink logical channel(s), specified in the IE SL-TrafficPatternInfo, that are setup for NR sidelink communication.
- type1 Indicates the preferred amount of increment/decrement to the long DRX cycle length with respect to the current configuration. Value in number of milliseconds. Value ms40 corresponds to 40 milliseconds, msMinus40 corresponds to -40 milliseconds and so on.
- victimSystemType Indicate the list of victim system types to which IDC interference is caused from NR when configured with UL CA. Value gps , glonass , bds , galileo and navIC indicates the type of GNSS. Value wlan indicates WLAN and value bluetooth indicates Bluetooth.
- SL-TrafficPatternInfo field descriptions messageSize Indicates the maximum TB size based on the observed traffic pattern.
- timingOffset This field indicates the estimated timing for a packet arrival in a sidelink logical channel. Specifically, the value indicates the timing offset with respect to subframe#0 of SFN#0 in milliseconds.
- trafficPeriodicity This field indicates the estimated data arrival periodicity in a sidelink logical channel. Value ms20 corresponds to 20 ms, ms50 corresponds to 50 ms and so on.
- the CU node may receive Expected UE behavior information from the AMF.
- the CU node may receive the Core Network Assistance Information message from the AMF.
- the message may include Expected UE behavior information.
- 'Expected UE Behavior' of standard 3GPP TS 38.413 may be referenced.
- the IE is predictable to support the NG-RAN node (eg, optimal RRC connection time or RRC_INACTIVE state transition and RNA (RAN-based Notification Area) configuration (eg, determination of size and shape of RNA)) It may indicate the operation of the UE with activity and / or mobility operation.
- Expected HO Interval O ENUMERATED (sec15, sec30, sec60, sec90, sec120, sec180, long-time, 10) Indicates the expected time interval between inter NG-RAN node handovers. If "long-time" is included, the interval between inter NG-RAN node handovers is expected to be longer than 180 seconds.
- Expected UE Mobility O ENUMERATED (stationary, mobile, 7) Indicates whether the UE is expected to be stationary or mobile.
- Expected UE Moving Trajectory 0..1 Indicates the UE's expected geographical movement.
- the CU node may perform the E2 Report service based on at least one of UE assistance information obtained from the UE or Expected UE Behavior obtained from the AMF.
- the CU node may transmit UE context information and cell context information to the RIC.
- the CU node may transmit the collected information (ie, at least one of UE assistance information information or Expected UE Behavior obtained from AMF) to the RIC.
- FIG. 8 illustrates signaling for sharing Expected UE Behavior and UE assistance information information among UE context information between an E2 node and an RIC according to various embodiments of the present disclosure.
- the E2 node may be an O-CU.
- the SET UP procedure, the RIC subscription procedure, the RIC indication message transmission procedure, and the RIC control message transmission procedure have been sequentially described, various embodiments of the present disclosure are not limited to the above-described sequence and procedure. does not In some embodiments of the present disclosure, the E2 node and the RIC may independently perform the E2 configuration procedure. In some embodiments of the present disclosure, the E2 node and the RIC may independently perform a subscription procedure. According to another embodiment of the present disclosure, as described above, the E2 setup response message may include a subscription request message. In some embodiments, the E2 node and the RIC may independently perform the RIC indication procedure.
- the E2 node may deliver UE context information to the RIC INDICATION message defined in E2SM RAN CONTROL according to the UE Context Transfer event trigger condition set by the RIC.
- UE Context information includes at least one of the following information, but is not limited to such UE information.
- Expected UE Behavior information is a message that the gNB receives from the AMF and is received by the gNB as the following NG Interface messages.
- Expected UE Behavior information includes Expected HO Interval information, Expected UE Mobility information, and Expected UE Moving Trajectory information (NG-RAN CGI, Time Stayed in Cell) specified in 3GPP TS 38.413. For example, information in Table 3 may be referred to.
- Expected HO Interval information indicates an expected time interval between handovers between NG-RAN nodes. If "long time” is included, the handover interval between NG-RAN nodes can be expected to be 180 seconds or more.
- Expected UE Mobility information indicates whether the UE is in a stationary state or in a mobile state.
- the Expected UE Moving Trajectory information (eg, up to 16 pieces) indicates the expected geographic movement of the UE.
- the Expected UE Moving Trajectory information may include a list of visited cells and non-visited cells. In the list, the visited cells are listed in the order they were visited by the UE, and the most recent cell may be first in the list. An unvisited cell may be included immediately after the associated visited cell.
- the Expected UE Moving Trajectory information is included with respect to the visited cell and may include information indicating the time (seconds) that the UE stays in the cell. As an example, if the UE stays in the cell for x seconds (x is an integer less than or equal to 4095), the IE may be set to x. Also, if the UE stays in the cell for more than 4095 seconds, the IE may be set to 4095.
- Expected UE Behavior or UE Assistance Information may be delivered to the RIC from the E2 node (eg, gNB or gNB-CU) through E2SM-RC RIC Indication. It is possible to indicate which information is delivered to the RIC through the setting of the parameter ID value. For example, when the parameter ID is 7, information included in the corresponding parameter may be Expected UE Behavior information. Also, for example, when the parameter ID is 8, information included in the corresponding parameter may be UE Assistance Information information.
- FIG. 9 shows an example of information delivery through a next generation application protocol (NGAP) UE Context Modification Request message to the Core Network Assistance Information IE by the AMF to the O-CU-CP according to various embodiments of the present disclosure.
- NGAP next generation application protocol
- the AMF may provide a Core Network Assistance Information IE to the NG-RAN node to support the determination of the NG-RAN node whether the UE can be transmitted as RRC_INACTIVE.
- the Core Network Assistance Information IE may include the following information.
- the UE registration area may be considered in the NG-RAN node when configuring the RNA.
- the UE specific discontinuous reception (DRX) and UE Identity Index values may be used by the NG-RAN node for RAN paging.
- the periodic registration update timer may be considered in the NG-RAN node to configure the periodic RNA update timer.
- the NG-RAN node may consider the expected UE behavior to help determine the UE RRC state transition.
- the Core Network Assistance Information IE may be configured as follows.
- Rangebound Explanation maxnoofTAIforInactive Maximum no. of TAIs for RRC Inactive. Value is 16.
- the UE Identity Index value may be configured as follows.
- the periodic registration update timer may be configured as follows.
- Bits 5 to 1 represent the binary coded timer value.
- Bits 6 to 8 define the timer value unit for the Periodic Registration Update Timer as follows: Bits 876 000 value is incremented in multiples of 10 minutes 001 value is incremented in multiples of 1 hour 010 value is incremented in multiples of 10 hours 011 value is incremented in multiples of 2 seconds 100 value is incremented in multiples of 30 seconds 101 value is incremented in multiples of 1 minute 111 value indicates that the timer is deactivated. Other values shall be interpreted as multiples of 1 hour in this version of the protocol.
- the AMF may transmit a UE Context Modification Request message to a CU node (eg, O-CU-CP).
- the CU node may transmit a UE Context Modification Response message to the AMF.
- the Core Network Assistance Information IE delivers Expected UE Activity Behavior information, and the Expected UE Activity Behavior includes Expected HO Interval information, Expected UE Mobility information, and Expected UE Moving Trajectory information.
- the cell information where the location was located and the time information the UE stayed are listed in the most recent order. For example, Table 3 may be referred to as Expected UE behavior.
- the procedure is only an example, and the Expected UE behavior according to embodiments of the present disclosure may be used in other procedures.
- the message of the following procedures may be used for the N2 message between the AMF and the NG-RAN node (eg, gNB) including the Expected UE behavior.
- delivery of Expected UE behavior may be delivered through the IE of “CN Assisted RAN Parameters Tuning”.
- the IE may be used to assist parameter tuning in the NG-RAN node.
- the CN Assisted RAN Parameters Tuning IE may be configured as follows.
- This IE may be present in case the Core Network Assistance Information for RRC INACTIVE IE is not included and is ignored otherwise.
- FIG. 10 illustrates an example of information transfer by a UE through an RRC message of a UEAssistanceInformation IE to an O-CU-CP according to various embodiments of the present disclosure.
- a base station eg, gNB, gNB-CU, CU-CP
- a terminal ie, UE
- the terminal may transmit a UEAssistanceInformation message to the base station.
- UEAssistanceInformation may include UEAssistanceInformation-IEs.
- Table 1 and Table 2 may be referred to.
- the UE information of the UE Assistance Information corresponds to the configuration preference option or current state information of the UE.
- the UE Assistance Information may include DelayBudgetReport.
- DelayBudgetReport means terminal preference option information for adjustment of a C-DRX (connected mode DRX) cycle.
- the UE Assistance Information may include OverheatingAssistance: terminal preference option information for whether or not the terminal heats up and control when heat is generated.
- 11 illustrates a subscription procedure and RIC indication signaling between an E2 node and an RIC according to embodiments of the present disclosure.
- 11 illustrates a subscription procedure and a RIC Indication (REPORT) procedure between an E2 node and an RIC according to embodiments of the present disclosure.
- REPORT RIC Indication
- the RIC may transmit a RIC subscription request message to the E2 node.
- the E2 node may be O-CU-CP, O-CU-UP, or O-CU-DU.
- the E2 node may transmit a RIC subscription response message (RIC Subscription Response) to the RIC.
- the E2 node installs the Event TriggerDefinition defined in the subscription request message (RIC Subscription Request).
- the E2 node may transmit a RIC indication message to the Near RT RIC.
- Each E2 node may identify an event set for the corresponding E2 node through a subscription procedure.
- the RIC indication message may include Expected UE Behavior information.
- the RIC indication message may include UE Assistance Information.
- a parameter ID value among parameter lists included in the indication message format may indicate Expected UE Behavior or UE Assistance Information.
- Expected UE Behavior or UE Assistance Information corresponding to the parameter ID value may be included in the RIC indication message.
- 3GPP TS 38.331 in case of UE Assistance Information
- 3GPP TS 38.413 in case of Expected UE Behavior
- 12 illustrates an example of a format of a RIC event trigger definition according to embodiments of the present disclosure. 12 illustrates an example of a RIC service subscription request (RIC Subscription Request) procedure and message according to embodiments of the present disclosure.
- RIC Subscription Request RIC Subscription Request
- the near-RT RIC may transmit a RIC subscription request message to a base station (eg, gNB).
- RIC subscription request message may include a message type (message type), RIC request (request) ID, RAN function (function) ID, RIC subscription details (RIC subscription details).
- Information on RIC subscription details may include a RIC event trigger definition. That is, in FIG. 12, the format of the RIC Event Trigger Definition is shown in the RIC SUBSCRIPTION REQUEST message specified in the O-RAN standard. RIC Event Trigger Definition may be defined according to each RIC and SERVICE MODEL supported by RAN. Embodiments of the present disclosure propose a procedure for selecting Expected UE Behavior information and UE Assistance Information satisfying TRIGGERING CONDITION from among UE context related information that varies depending on the UE state of the RAN.
- a Message Type of the subscription message is the type number specified in the specification for each message type.
- RIC Request ID is an ID that uniquely manages the message in RIC.
- the RAN Function ID is an ID that identifies the FUNCTION that is the target of CONTROL in the E2 Node.
- the RIC Event Trigger Definition IE is defined in the form of the Event Trigger Definition Format defined in the Service Model in detail for the message. In this disclosure, the IE for the Event Trigger Definition Format is exemplified as E2SM-RC Event Trigger Definition Format 1, but the IE name may be different depending on the Service Model.
- Event Trigger Definition Format 1 indicates a condition list for designating an IE of a specific event, and the present disclosure exemplifies the IE as shown in the following UE event [Table 9], but the IE name is in the Service Model Thus, they may be different.
- the UE ID Report Triggering Condition is defined as a UE Event from among the condition values (RRC State Change List, UE Events List) defined in the CHOICE Condition that specifies the condition.
- UE Event Interface Type specifies the network interface in which the related event occurs
- Message Type is defined as Expected UE Behavior and UE Assistance Information specified in the 3GPP standard, respectively.
- the UE Event Name is the name of the event that the Message Type occurs for each Interface Type.
- FIG. 13 shows an example of a format of a RIC indication header according to embodiments of the present disclosure. Referring to FIG. 13 , an example of a RIC Indication Header message in a RIC REPORT service (RIC Indication) procedure according to embodiments of the present disclosure is described.
- RIC Indication RIC REPORT service
- a base station may transmit an E2 RIC indication message to the Near-RT RIC.
- the RIC Indication message specified in the O-RAN standard may include RIC Indication header information.
- the RIC Indication message may be different for each E2 service model, and may be defined for each E2 service model.
- the RIC Indication Header may include an E2SM Indication header format defined as a detailed message in the Service Model.
- the RIC Indication Header according to embodiments of the present disclosure may be defined as Indication Header Format 1 of E2SM-RC REPORT Service.
- Indication Header Format 1 of the detailed E2SM-RC REPORT SERVICE may include a Subscription ID designating a specific subscription, an ID of an E2 node, and a Condition ID.
- the Condition ID optionally specifies the Condition when a specific Condition is used.
- FIG. 14 illustrates examples of a format of an RIC indication message according to embodiments of the present disclosure.
- the E2 indication message is a Message Type, RIC Request ID, RIC Function ID, RIC Action ID, RIC Indication SN (optional), RIC Indication Type, RIC Indication Header, RIC Indication message, RIC Call process ID (optional) ) may be included.
- RIC indication message includes a UE Group ID, UE ID and Parameter List according to the E2SM-RC REPORT SERVICE indication format.
- a Parameter List may contain one or more sets. Each set is defined by Parameter ID, Parameter Name and Parameter Value. The set may include Expected UE Behavior Parameter ID and UE Assistance Information IE defined in this disclosure, and Expected UE Behavior Parameter ID and UE Assistance Information IE may be defined as shown in Table 10 below.
- 15 illustrates an example of a procedure in which E2SM-RC and E2SM-KPM services are performed together according to embodiments of the present disclosure.
- 15 shows an example in which Expected UE Behavior and UE Assistance Information are applied to an indication format and applied to AI/ML when the E2SM-RC and E2SM-KPM service models are applied according to embodiments of the present disclosure.
- Expected UE behavior information and UE assistance information information delivered as the RIC indication message may be stored in the UE state DB. The stored information is managed for each specific UE ID, so that machine learning can be performed by the AI/ML Host.
- Expected UE behavior information is as follows.
- UE Mobility An indication of whether the UE (UE) is a stationary UE or a mobile UE.
- the Near-RT RIC can configure the RAN by predicting the mobility of the UE based on Expected UE Behavior information on which machine learning is performed by the AI/ML Host.
- the Near-RT RIC can be set to TAC: Tracking Area Code, set to Narrow TAC when the terminal is a stationary UE, and set to Wide TAC in the case of a mobile UE.
- the Near-RT RIC may configure the RAN.
- the Near-RT RIC may instruct a control method when the terminal is overheating based on whether or not the terminal is heated and the terminal preference information for controlling when the heat is generated.
- the Near-RT RIC may control the Carrier Aggregation Carrier Component based on the reducedMaxCCs supported by the UE.
- embodiments of the present disclosure are not limited to one RAN, but by collecting explicit UE information and previous histories from multiple RANs through RIC of O-RAN, an open platform, through big data-based AI learning Efficiency can be maximized.
- the framework between the E2 node and the RIC can be summarized as follows.
- E2 node eg, gNB, gNB-CU, gNB-CU-CP
- the collected information eg, UE Expected Behavior information, UE Assistance information
- RIC processes information for each terminal or terminal group through the collected information (eg, category classification such as terminal vendor, model (model), RFSP, slice, etc.)
- RIC performs control or configuration (selection of parameters or algorithm options) optimized for the corresponding terminal (or terminal group)
- RIC, E2 node transmits control parameter, configuration command (or recommendation) message for RAN
- E2 node acquires the performance result in RAN and feeds back to RIC
- RIC performs correction and update of database policy and AI learning results based on feedback results. RIC reflects the corrected and updated results in subsequent controls/commands/recommendations
- RIC and gNB are as follows.
- Step 1) UE information corresponds to Expected UE Behavior (Mobility characteristics).
- UE Mobility An indication of whether the UE (UE) is a stationary UE or a mobile UE.
- Step 3 The RIC identifies the mobility characteristics of the terminal from the terminal information of the first step.
- RIC to RAN configuration is as follows.
- TAC Tracking Area Code
- the UE in the RRC_Idle state may receive CN paging while performing idle mobility (TA update).
- TAC settings usually have the following tradeoff relationships:
- Narrow TAC increases the TA update frequency, but in CN paging, paging can be broadcast to a small number of cells. (Reduce network CN/gNB paging load)
- RIC may configure RAN according to Expected UE Behavior (Mobility characteristic).
- RIC may be set to Narrow TAC in the case of a stationary UE, and may be set to Wide TAC in the case of a Mobile UE (control to determine the number of cells within the same TAC).
- the RIC can control the cell configuration of the TAC with the Expected UE Moving Trajectory information of the UE. For example, it is assumed that the TAC is configured with 6 cells (Random TAC: Cell 1/2/3/4/5/6). At this time, the TA update may occur frequently because it does not match the moving trajectory of the terminal. RIC can configure TAC based on Expected UE Moving Trajectory (eg, cell 1/11/21/31/41/51/61) The moving trajectory of the terminal and the TAC configuration match well, so the frequency of TA update is reduced can do.
- Expected UE Moving Trajectory eg, cell 1/11/21/31/41/51/61
- the above-mentioned examples can be applied individually to a specific terminal, and the RIC function is applied by AI learning by processing information for each terminal or terminal group, (categorized into categories such as terminal vendor, model (model), RFSP, and Slice) It may include an action to On the other hand, when all UEs within a cell are affected by a terrain feature or a road (bus route, subway), etc., a method commonly applied to all UEs may also be understood as an embodiment of the present disclosure.
- RNA RAN Notification Area
- the UE in the RRC_Inactive state may receive RAN paging while performing idle mobility (RNA update).
- RAN settings generally have the following tradeoff relationships:
- RNA update frequency when RAN paging, paging should be broadcast to many cells. (Increase network gNB paging load)
- Narrow RNA increases the RNA update frequency, but it can broadcast paging to a small number of cells during RAN paging. (reduce network gNB paging load)
- RIC can configure RNA according to Expected UE Behavior (Mobility characteristics) of the UE.
- RIC may be set to Narrow RNA in the case of a stationary UE, and may be set to Wide RNA in the case of a Mobile UE (control to determine the number of cells within the same RNA).
- the RIC can control the cell configuration of the RNA with the Expected UE Moving Trajectory information of the UE even in the case of RNA of the same width.
- RNA is composed of 6 cells (Random RNA composition: Cell 1/2/3/4/5/6).
- the RNA configuration does not match the moving trajectory of the terminal, so RNA updates may occur frequently.
- RIC may construct RNA based on the Expected UE Moving Trajectory (eg, cell 1/11/21/31/41/51/61). In this case, since the RIC coincides with the moving trajectory of the terminal at a relatively high rate, the frequency of RNA update may be reduced than before.
- the RIC function is an operation of applying AI learning to information processing for each terminal or terminal group, (categorized into categories such as terminal vendor, model (model), RFSP, and Slice) may include
- categories such as terminal vendor, model (model), RFSP, and Slice
- a method commonly applied to all UEs may also be understood as an embodiment of the present disclosure.
- the UE in the RRC_CONNECTED state may perform measurement according to a measurement configuration and report a measurement result.
- the RIC may acquire information such as target cell information, measurement cell information, and black cell information according to the mobility of the terminal in advance through the information of the terminal.
- the RIC may provide a measurement configuration suitable for the UE based on the target cell ID, the Measurement Object target cell ID, and the Black cell ID of the mobility information.
- the RIC performs machine learning and updates the result, thereby providing a RAN configuration that more closely matches the operation of an actual UE (or group of UEs).
- UE Assistance information corresponds to a configuration preference option or current state information of a terminal.
- DelayBudgetReport Terminal preference option information for adjustment of C-DRX cycle
- OverheatingAssistance Terminal preference option information on whether or not the terminal is overheating and control when overheating
- ReleasePreference UE call release (RRC release)
- RRC Idle UE preference option information (RRC Idle, RRC connected)
- the RIC may determine configuration preference options or current state information from UE Assistance information.
- RIC to RAN configuration is as follows.
- OverheatingAssistance Terminal preference option information on whether or not the terminal is overheating and control when overheating
- the RIC may indicate a method of deactivating or releasing CC of a CC of another frequency while leaving a CC of a certain frequency.
- the RIC may transmit to the RAN (gNB) a method of deactivating or selecting a CC releasing CC based on colocation/non-colocation information of the corresponding CC.
- gNB RAN
- the RAN may transmit a feedback of the performance result to the RIC.
- the feedback result may include the effect of resolving the heat (continuance of resolving the heat problem after the time taken to resolve the heat, etc.) when deactivation or CC release is performed based on each setting method.
- RIC calibrates and updates database policies and AI learning results.
- the RIC may reflect the corrected and updated results in subsequent controls/commands/recommendations.
- the RIC is a logical node, but may be an independent device implemented in hardware.
- signaling may be performed through an individual E2 node and an E2 interface through a device in which the RIC function is implemented.
- the RIC may transmit a message to the DU node or receive a message from the DU node.
- the RIC may transmit a message to the CU node or receive a message from the CU. If the CU node is separated from the CP (control plane) and the UP (user plane), the RIC may transmit a message to the CU-CP node or receive a message from the CU-CP. In addition, the RIC may transmit a message to the CU-UP node or receive a message from the CU-UP.
- RIC may be implemented together with a CU node. That is, an apparatus performing RIC may be configured to perform a function of a CU node.
- the device performing RIC may be configured to perform the function of the CU-CP.
- the RIC is implemented in one device (or adjacent device) with the CU-CP, signaling between two logical nodes and delay time accordingly can be further reduced.
- the CU node and the device performing the RIC function may acquire UE Assistance information and Expected UE Behavior.
- the device may generate RAN settings such as paging configuration information, RNA configuration information, and measurement configuration information through an internal acquisition procedure through FIGS. 13 to 15 , and transmit the RAN settings to a corresponding DU.
- IPC cost may be reduced.
- the cost for message relay may be reduced. Since RIC performs everything except message delivery, interoperability problems between vendors can be resolved.
- an intelligent function of the RIC may be upgraded to replace a specific function between DUs and CU-UPs.
- E2 control messages can be individually defined based on the RAN function supportable for each E2 node. have.
- RIC utilizes the existing E2SM-NI and E2SM-KPM, and O-CU-CP, O-CU-UP, O using the RRC E2 control message relaying the control message -Can control the entire DU.
- efficient management can be performed. In particular, effective load balancing can be achieved in a service area where vendors overlap.
- the RIC exemplifies near-RT, but embodiments of the present disclosure are not limited thereto.
- Embodiments of the present disclosure obtain UE Assistance information and Expected UE Behavior and use them to efficiently configure RAN, and non-RT RIC also collects and collects UE Assistance information and Expected UE Behavior.
- the RAN can be configured (eg, paging configuration, RNA configuration, measurement configuration).
- Non-Real Time RIC refers to the orchestration and automation functions described by the O-RAN Alliance for non-real-time intelligent management of RAN (Radio Access Network) functions.
- the main goal of Non-RT RIC is to provide guidelines, parameters, policies, and AI/ML models to support non-real-time radio resource management, optimization of upper layer procedures, and policy optimization of RAN, and to support the operation of near-RT RIC functions. will do In RAN to achieve higher level non-real-time goals.
- Non-RT RIC capabilities may include service and policy management, RAN analysis, and model training for near real-time RIC.
- Non-RT RIC can communicate with the near-RT RIC element of RAN via A1 interface. Using the A1 interface, Non-RT RIC can facilitate policy provision for individual UEs or groups of UEs. Non-RT RIC monitors and provides basic feedback on policy status from near-RT RIC. Non-RT RIC may provide reinforcement information required by near-RT RIC. Non-RT RIC can work with near-RT RIC to facilitate ML model training, deployment and inference.
- the NON RT RIC function can partially utilize and extend the existing infrastructure of an SMO (eg, Open Network Automation Platform (ONAP) or Management and Orchestration (MANO)) to support non-real-time control of a Radio Access Network (RAN).
- SMO Open Network Automation Platform
- MANO Management and Orchestration
- Non-RT RIC may be included in Service Management and Orchestration (SMO).
- SMO Service Management and Orchestration
- Non-RT RIC can be implemented as a function inside the SMO.
- the SMO may be connected to each node (O-DU, O-CU, O-CU-UP, O-CU-CP) of the O-RAN through the O1 interface.
- UE Assistance information and Expected UE Behavior may be delivered to the non-RT RIC through the O1 interface.
- the CU node may transmit UE Assistance information collected from the UE to the SMO through the O1 interface.
- UE Assistance information is delivered to non-RT RIC through SMO.
- the CU node may transmit the Expected UE Behavior collected from the UE to the SMO through the O1 interface.
- Expected UE behavior is delivered to non-RT RIC through SMO.
- the SMO may be connected to not only each node of the O-RAN, but also an entity of the core network (eg, EPC, 5GC, which are the core of 3GPP). SMO can be connected through the core network of 5GC/EPC and a management interface. The SMO may obtain information on Expected UE Behavior directly from the AMF. The SMO may deliver directly acquired information to the non-RT RIC.
- EPC entity of the core network
- 5GC which are the core of 3GPP
- 3GPP 3GPP
- the SMO may obtain information on Expected UE Behavior directly from the AMF.
- the SMO may deliver directly acquired information to the non-RT RIC.
- Non-RT RIC and near RT RIC can be connected through A1 interface.
- Policy information (hereinafter, A1 Policy) may be provided through the A1 interface.
- Assistance information and Expected UE Behavior may be delivered to the non-RT RIC through the A1 interface. That is, as described with reference to FIGS. 7 to 15 , the near RT RIC may acquire Assistance information and Expected UE Behavior, and provide the acquired information to the non-RT RIC again through the A1 interface.
- Expected UE Behavior information is information that the gNB (or gNB-CU) receives from the AMF and is delivered to the gNB as G Interface messages.
- Expected UE Behavior information includes Expected HO Interval information, Expected UE Mobility information, and Expected UE Moving Trajectory information (NG-RAN CGI, Time Stayed in Cell) specified in 3GPP TS 38.413. For example, information in Table 3 may be referred to.
- Expected HO Interval information indicates an expected time interval between handovers between NG-RAN nodes. When “long time” is included, the handover interval between NG-RAN nodes can be expected to be 180 seconds or more.
- Expected UE Mobility information indicates whether the UE is in a stationary state or in a mobile state.
- the Expected UE Moving Trajectory information (eg, up to 16 pieces) indicates the expected geographic movement of the UE.
- the Expected UE Moving Trajectory information may include a list of visited cells and non-visited cells. In the list, the visited cells are listed in the order they were visited by the UE, and the most recent cell may be first in the list. An unvisited cell may be included immediately after the associated visited cell.
- the Expected UE Moving Trajectory information is included with respect to the visited cell and may include information indicating the time (seconds) that the UE stays in the cell. As an example, if the UE stays in the cell for x seconds (x is an integer less than or equal to 4095), the IE may be set to x. Also, if the UE stays in the cell for more than 4095 seconds, the IE may be set to 4095.
- the UE information of the UE Assistance Information corresponds to the configuration preference option or current state information of the UE.
- UE Assistance Information may include DelayBudgetReport.
- DelayBudgetReport means terminal preference option information for adjustment of a C-DRX (connected mode DRX) cycle.
- the UE Assistance Information may include OverheatingAssistance: terminal preference option information for whether or not the terminal heats up and control when heat is generated.
- the non-RT RIC may acquire at least one of Expected UE Behavior and UE Assistance Information through the O1 interface or the A1 interface.
- Expected UE Behavior or UE Assistance Information may be obtained through the same interface or may be obtained through different interfaces.
- Expected UE Behavior may be obtained through the O1 interface, or UE Assistance Information may be obtained through the A1 interface.
- Expected UE Behavior may be obtained through the A1 interface, or UE Assistance Information may be obtained through the O1 interface.
- Expected UE Behavior and UE Assistance Information may be obtained through the A1 interface, or Expected UE Behavior may be additionally obtained through the O1 interface. Examples of interfaces to be obtained may be changed within obvious limits.
- the non RT RIC may perform AI/ML in a scale unit larger than that of the near RT RIC based on the acquired information.
- the non RT RIC may generate configuration information of a relatively larger scale than the RAN configuration in the near RT RIC, based on the acquired information.
- non-RT RIC predicts the mobility of the UE based on Expected UE Behavior information on which machine learning is performed by the AI/ML Host, and configures the RAN ( configure) can be done.
- the location of the AI/ML host may be located in a non-RT RIC.
- non-RT RIC can be set to TAC: Tracking Area Code, set to Narrow TAC in case the terminal is a stationary UE, and set to Wide TAC in case of a mobile UE.
- non-RT RIC is a larger scale, and can configure TAC for a specific UE.
- non-RT RIC may not configure TAC for a specific UE for a certain period of time.
- the non-RT RIC may not set the TAC for a specific UE for a certain period of time.
- the non-RT RIC may set the TAC in units of time in units of hours/days/weeks when a movement path is expected for a specific UE.
- the non-RT RIC may configure the RAN.
- the non-RT RIC may instruct the control method when the terminal is overheating based on the terminal preference information on whether the terminal is overheating and whether the terminal is overheating.
- the non-RT RIC may control the Carrier Aggregation Carrier Component based on the reducedMaxCCs supported by the UE.
- non-RT RIC is a larger scale, and can configure CA settings for a specific UE.
- non-RT RIC may limit the maximum number of CCs during CA for a specific UE for a long time.
- non-RT RIC may limit the maximum number of available antennas for a specific UE for a long time.
- the RAN configuration by non-RT RIC may be transmitted to each E2 node through at least one of an O1 interface or an A1 interface, as information is acquired.
- the non-RT RIC may provide the RAN configuration to the gNB-CU via the near-RT RIC.
- the non-RT RIC may provide the RAN configuration to the gNB-CU, which is an individual E2 node, through SMO.
- a computer-readable storage medium storing one or more programs (software modules) may be provided.
- One or more programs stored in the computer-readable storage medium are configured to be executable by one or more processors in an electronic device (device).
- One or more programs include instructions for causing an electronic device to execute methods according to embodiments described in a claim or specification of the present disclosure.
- Such programs include random access memory, non-volatile memory including flash memory, read only memory (ROM), electrically erasable programmable ROM (electrically erasable programmable read only memory, EEPROM), magnetic disc storage device, compact disc-ROM (CD-ROM), digital versatile discs (DVDs), or other It may be stored in an optical storage device or a magnetic cassette. Alternatively, it may be stored in a memory composed of a combination of some or all thereof. In addition, each configuration memory may be included in plurality.
- non-volatile memory including flash memory, read only memory (ROM), electrically erasable programmable ROM (electrically erasable programmable read only memory, EEPROM), magnetic disc storage device, compact disc-ROM (CD-ROM), digital versatile discs (DVDs), or other It may be stored in an optical storage device or a magnetic cassette. Alternatively, it may be stored in a memory composed of a combination of some or all thereof. In addition, each configuration memory may be included in plurality.
- the program is transmitted through a communication network consisting of a communication network such as the Internet, an intranet, a local area network (LAN), a wide area network (WAN), or a storage area network (SAN), or a combination thereof. It may be stored on an attachable storage device that can be accessed. Such a storage device may be connected to a device implementing an embodiment of the present disclosure through an external port. In addition, a separate storage device on the communication network may be connected to the device implementing the embodiment of the present disclosure.
- a communication network such as the Internet, an intranet, a local area network (LAN), a wide area network (WAN), or a storage area network (SAN), or a combination thereof. It may be stored on an attachable storage device that can be accessed.
- Such a storage device may be connected to a device implementing an embodiment of the present disclosure through an external port.
- a separate storage device on the communication network may be connected to the device implementing the embodiment of the present disclosure.
- the present disclosure relates to an apparatus and method for E2 node control by RIC in a radio access network.
- the present disclosure relates to an apparatus and method for controlling an E2 node through an E2 message conforming to an open radio access network (O-RAN) standard of a wireless communication system.
- OF-RAN open radio access network
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Abstract
Description
UEAssistanceInformation message -- ASN1START -- TAG-UEASSISTANCEINFORMATION-START UEAssistanceInformation ::= SEQUENCE { criticalExtensions CHOICE { ueAssistanceInformation UEAssistanceInformation-IEs, criticalExtensionsFuture SEQUENCE {} } } UEAssistanceInformation-IEs ::= SEQUENCE { delayBudgetReport OPTIONAL, lateNonCriticalExtension OCTET STRING OPTIONAL, nonCriticalExtension UEAssistanceInformation-v1540-IEs OPTIONAL } DelayBudgetReport::= CHOICE { type1 ENUMERATED { msMinus1280, msMinus640, msMinus320, msMinus160,msMinus80, msMinus60, msMinus40, msMinus20, ms0, ms20,ms40, ms60, ms80, ms160, ms320, ms640, ms1280}, ... } UEAssistanceInformation-v1540-IEs ::= SEQUENCE { overheatingAssistance OverheatingAssistance OPTIONAL, nonCriticalExtension UEAssistanceInformation-v1610-IEs OPTIONAL } OverheatingAssistance ::= SEQUENCE { reducedMaxCCs ReducedMaxCCs-r16 OPTIONAL, reducedMaxBW-FR1 ReducedMaxBW-FRx-r16 OPTIONAL, reducedMaxBW-FR2 ReducedMaxBW-FRx-r16 OPTIONAL, reducedMaxMIMO-LayersFR1 SEQUENCE { reducedMIMO-LayersFR1-DL MIMO-LayersDL, reducedMIMO-LayersFR1-UL MIMO-LayersUL } OPTIONAL, reducedMaxMIMO-LayersFR2 SEQUENCE { reducedMIMO-LayersFR2-DL MIMO-LayersDL, reducedMIMO-LayersFR2-UL MIMO-LayersUL } OPTIONAL } ReducedAggregatedBandwidth ::= ENUMERATED {mhz0, mhz10, mhz20, mhz30, mhz40, mhz50, mhz60, mhz80, mhz100, mhz200, mhz300, mhz400} UEAssistanceInformation-v1610-IEs ::= SEQUENCE { idc-Assistance-r16 IDC-Assistance-r16 OPTIONAL, drx-Preference-r16 DRX-Preference-r16 OPTIONAL, maxBW-Preference-r16 MaxBW-Preference-r16 OPTIONAL, maxCC-Preference-r16 MaxCC-Preference-r16 OPTIONAL, maxMIMO-LayerPreference-r16 MaxMIMO-LayerPreference-r16 OPTIONAL, minSchedulingOffsetPreference-r16 MinSchedulingOffsetPreference-r16 OPTIONAL, releasePreference-r16 ReleasePreference-r16 OPTIONAL, sl-UE-AssistanceInformationNR-r16 SL-UE-AssistanceInformationNR-r16 OPTIONAL, referenceTimeInfoPreference-r16 BOOLEAN OPTIONAL, nonCriticalExtension SEQUENCE {} OPTIONAL } IDC-Assistance-r16 ::= SEQUENCE { affectedCarrierFreqList-r16 AffectedCarrierFreqList-r16 OPTIONAL, affectedCarrierFreqCombList-r16 AffectedCarrierFreqCombList-r16 OPTIONAL, ... } AffectedCarrierFreqList-r16 ::= SEQUENCE (SIZE (1.. maxFreqIDC-r16)) OF AffectedCarrierFreq-r16 AffectedCarrierFreq-r16 ::= SEQUENCE { carrierFreq-r16 ARFCN-ValueNR, interferenceDirection-r16 ENUMERATED {nr, other, both, spare} } AffectedCarrierFreqCombList-r16 ::= SEQUENCE (SIZE (1..maxCombIDC-r16)) OF AffectedCarrierFreqComb-r16 AffectedCarrierFreqComb-r16 ::= SEQUENCE { affectedCarrierFreqComb-r16 SEQUENCE (SIZE (2..maxNrofServingCells)) OF ARFCN-ValueNR OPTIONAL, victimSystemType-r16 VictimSystemType-r16 } VictimSystemType-r16 ::= SEQUENCE { gps-r16 ENUMERATED {true} OPTIONAL, glonass-r16 ENUMERATED {true} OPTIONAL, bds-r16 ENUMERATED {true} OPTIONAL, galileo-r16 ENUMERATED {true} OPTIONAL, navIC-r16 ENUMERATED {true} OPTIONAL, wlan-r16 ENUMERATED {true} OPTIONAL, bluetooth-r16 ENUMERATED {true} OPTIONAL, ... } DRX-Preference-r16 ::= SEQUENCE { preferredDRX-InactivityTimer-r16 ENUMERATED { ms0, ms1, ms2, ms3, ms4, ms5, ms6, ms8, ms10, ms20, ms30, ms40, ms50, ms60, ms80, ms100, ms200, ms300, ms500, ms750, ms1280, ms1920, ms2560, spare9, spare8, spare7, spare6, spare5, spare4, spare3, spare2, spare1} OPTIONAL, preferredDRX-LongCycle-r16 ENUMERATED { ms10, ms20, ms32, ms40, ms60, ms64, ms70, ms80, ms128, ms160, ms256, ms320, ms512, ms640, ms1024, ms1280, ms2048, ms2560, ms5120, ms10240, spare12, spare11, spare10, spare9, spare8, spare7, spare6, spare5, spare4, spare3, spare2, spare1 } OPTIONAL, preferredDRX-ShortCycle-r16 ENUMERATED { ms2, ms3, ms4, ms5, ms6, ms7, ms8, ms10, ms14, ms16, ms20, ms30, ms32, ms35, ms40, ms64, ms80, ms128, ms160, ms256, ms320, ms512, ms640, spare9, spare8, spare7, spare6, spare5, spare4, spare3, spare2, spare1 } OPTIONAL, preferredDRX-ShortCycleTimer-r16 INTEGER (1..16) OPTIONAL } MaxBW-Preference-r16 ::= SEQUENCE { reducedMaxBW-FR1-r16 ReducedMaxBW-FRx-r16 OPTIONAL, reducedMaxBW-FR2-r16 ReducedMaxBW-FRx-r16 OPTIONAL } MaxCC-Preference-r16 ::= SEQUENCE { reducedMaxCCs-r16 ReducedMaxCCs-r16 OPTIONAL } MaxMIMO-LayerPreference-r16 ::= SEQUENCE { reducedMaxMIMO-LayersFR1-r16 SEQUENCE { reducedMIMO-LayersFR1-DL-r16 INTEGER (1..8), reducedMIMO-LayersFR1-UL-r16 INTEGER (1..4) } OPTIONAL, reducedMaxMIMO-LayersFR2-r16 SEQUENCE { reducedMIMO-LayersFR2-DL-r16 INTEGER (1..8), reducedMIMO-LayersFR2-UL-r16 INTEGER (1..4) } OPTIONAL } MinSchedulingOffsetPreference-r16 ::= SEQUENCE { preferredK0-r16 SEQUENCE { preferredK0-SCS-15kHz-r16 ENUMERATED {sl1, sl2, sl4, sl6} OPTIONAL, preferredK0-SCS-30kHz-r16 ENUMERATED {sl1, sl2, sl4, sl6} OPTIONAL, preferredK0-SCS-60kHz-r16 ENUMERATED {sl2, sl4, sl8, sl12} OPTIONAL, preferredK0-SCS-120kHz-r16 ENUMERATED {sl2, sl4, sl8, sl12} OPTIONAL } OPTIONAL, preferredK2-r16 SEQUENCE { preferredK2-SCS-15kHz-r16 ENUMERATED {sl1, sl2, sl4, sl6} OPTIONAL, preferredK2-SCS-30kHz-r16 ENUMERATED {sl1, sl2, sl4, sl6} OPTIONAL, preferredK2-SCS-60kHz-r16 ENUMERATED {sl2, sl4, sl8, sl12} OPTIONAL, preferredK2-SCS-120kHz-r16 ENUMERATED {sl2, sl4, sl8, sl12} OPTIONAL } OPTIONAL } ReleasePreference-r16 ::= SEQUENCE { preferredRRC-State-r16 ENUMERATED {idle, inactive, connected, outOfConnected} } ReducedMaxBW-FRx-r16 ::= SEQUENCE { reducedBW-DL-r16 ReducedAggregatedBandwidth, reducedBW-UL-r16 ReducedAggregatedBandwidth } ReducedMaxCCs-r16 ::= SEQUENCE { reducedCCsDL-r16 INTEGER (0..31), reducedCCsUL-r16 INTEGER (0..31) } SL-UE-AssistanceInformationNR-r16 ::= SEQUENCE (SIZE (1..maxNrofTrafficPattern-r16)) OF SL-TrafficPatternInfo-r16 SL-TrafficPatternInfo-r16::= SEQUENCE { trafficPeriodicity-r16 ENUMERATED {ms20, ms50, ms100, ms200, ms300, ms400, ms500, ms600, ms700, ms800, ms900, ms1000}, timingOffset-r16 INTEGER (0..10239), messageSize-r16 BIT STRING (SIZE (8)), sl-QoS-FlowIdentity-r16 SL-QoS-FlowIdentity-r16 } -- TAG-UEASSISTANCEINFORMATION-STOP -- ASN1STOP |
UEAssistanceInformation field descriptions |
affectedCarrierFreqList Indicates a list of NR carrier frequencies that are affected by IDC problem. |
affectedCarrierFreqCombList Indicates a list of NR carrier frequency combinations that are affected by IDC problems due to Inter-Modulation Distortion and harmonics from NR when configured with UL CA. |
delayBudgetReport Indicates the UE-preferred adjustment to connected mode DRX. |
interferenceDirection Indicates the direction of IDC interference. Value nr indicates that only NR is victim of IDC interference, value other indicates that only another radio is victim of IDC interference and value both indicates that both NR and another radio are victims of IDC interference. The other radio refers to either the ISM radio or GNSS (see TR 36.816 [44]). |
minSchedulingOffsetPreference Indicates the UE's preferences on minimumSchedulingOffset of cross-slot scheduling for power saving. |
preferredDRX-InactivityTimer Indicates the UE's preferred DRX inactivity timer length for power saving. Value in ms (millisecond). ms0 corresponds to 0, ms1 corresponds to 1 ms, ms2 corresponds to 2 ms, and so on. If the field is absent from the DRX-Preference IE, it is interpreted as the UE having no preference for the DRX inactivity timer. If secondary DRX group is configured, the preferredDRX-InactivityTimer only applies to the default DRX group. |
preferredDRX-LongCycle Indicates the UE's preferred long DRX cycle length for power saving. Value in ms. ms10 corresponds to 10ms, ms20 corresponds to 20 ms, ms32 corresponds to 32 ms, and so on. If preferredDRX-ShortCycle is provided, the value of preferredDRX-LongCycle shall be a multiple of the preferredDRX-ShortCycle value. If the field is absent from the DRX-Preference IE, it is interpreted as the UE having no preference for the long DRX cycle. |
preferredDRX-ShortCycle Indicates the UE's preferred short DRX cycle length for power saving. Value in ms. ms2 corresponds to 2ms, ms3 corresponds to 3 ms, ms4 corresponds to 4 ms, and so on. If the field is absent from the DRX-Preference IE, it is interpreted as the UE having no preference for the short DRX cycle. |
preferredDRX-ShortCycleTimer Indicates the UE's preferred short DRX cycle timer for power saving. Value in multiples of preferredDRX-ShortCycle. A value of 1 corresponds to preferredDRX-ShortCycle, a value of 2 corresponds to 2 * preferredDRX-ShortCycle and so on. If the field is absent from the DRX-Preference IE, it is interpreted as the UE having no preference for the short DRX cycle timer. A preference for the short DRX cycle is indicated when a preference for the short DRX cycle timer is indicated. |
preferredK0Indicates the UE's preferred value of k0 (slot offset between DCI and its scheduled PDSCH - see TS 38.214 [19], clause 5.1.2.1) for cross-slot scheduling for power saving. Value is defined for each subcarrier spacing (numerology) in units of slots. sl1 corresponds to 1 slot, sl2 corresponds to 2 slots, sl4 corresponds to 4 slots, and so on. If a value for a subcarrier spacing is absent, it is interpreted as the UE having no preference on k0 for cross-slot scheduling for that subcarrier spacing. If the field is absent from the MinSchedulingOffsetPreference IE, it is interpreted as the UE having no preference on k0 for cross-slot scheduling. |
preferredK2 Indicates the UE's preferred value of k2 (slot offset between DCI and its scheduled PUSCH - see TS 38.214 [19], clause 6.1.2.1) for cross-slot scheduling for power saving. Value is defined for each subcarrier spacing (numerology) in units of slots. sl1 corresponds to 1 slot, sl2 corresponds to 2 slots, sl4 corresponds to 4 slots, and so on. If a value for a subcarrier spacing is absent, it is interpreted as the UE having no preference on k2 for cross-slot scheduling for that subcarrier spacing. If the field is absent from the MinSchedulingOffsetPreference IE, it is interpreted as the UE having no preference on k2 for cross-slot scheduling. |
preferredRRC-State Indicates the UE's preferred RRC state. The value idle is indicated if the UE prefers to be released from RRC_CONNECTED and transition to RRC_IDLE. The value inactive is indicated if the UE prefers to be released from RRC_CONNECTED and transition to RRC_INACTIVE. The value connected is indicated if the UE prefers to revert an earlier indication to leave RRC_CONNECTED state. The value outOfConnected is indicated if the UE prefers to be released from RRC_CONNECTED and has no preferred RRC state to transition to. The value connected can only be indicated if the UE is configured with connectedReporting. |
reducedBW-FR1 Indicates the UE's preference on reduced configuration corresponding to the maximum aggregated bandwidth across all downlink carrier(s) and across all uplink carrier(s) of FR1, to address overheating or power saving. This field is allowed to be reported only when UE is configured with serving cell(s) operating on FR1. The aggregated bandwidth across all downlink carrier(s) of FR1 is the sum of bandwidth of active downlink BWP(s) across all activated downlink carrier(s) of FR1. The aggregated bandwidth across all uplink carrier(s) of FR1 is the sum of bandwidth of active uplink BWP(s) across all activated uplink carrier(s) of FR1. If the field is absent from the MaxBW-Preference IE or the OverheatingAssistance IE, it is interpreted as the UE having no preference on the maximum aggregated bandwidth of FR1. When indicated to address overheating, this maximum aggregated bandwidth includes carrier(s) of FR1 of both the NR MCG and the SCG. This maximum aggregated bandwidth only includes carriers of FR1 of the SCG in (NG)EN-DC. Value mhz0 is not used when indicated to address overheating. When indicated to address power saving, this maximum aggregated bandwidth includes carrier(s) of FR1 of the cell group that this UE assistance information is associated with. The aggregated bandwidth can only range up to the current active configuration when indicated to address power savings. |
reducedBW-FR2 Indicates the UE's preference on reduced configuration corresponding to the maximum aggregated bandwidth across all downlink carrier(s) and across all uplink carrier(s) of FR2, to address overheating or power saving. This field is allowed to be reported only when UE is configured with serving cell(s) operating on FR2. The aggregated bandwidth across all downlink carrier(s) of FR2 is the sum of bandwidth of active downlink BWP(s) across all activated downlink carrier(s) of FR2. The aggregated bandwidth across all uplink carrier(s) of FR2 is the sum of bandwidth of active uplink BWP(s) across all activated uplink carrier(s) of FR2. If the field is absent from the MaxBW-Preference IE or the OverheatingAssistance IE, it is interpreted as the UE having no preference on the maximum aggregated bandwidth of FR2. When indicated to address overheating, this maximum aggregated bandwidth includes carrier(s) of FR2 of both the NR MCG and the NR SCG. This maximum aggregated bandwidth only includes carriers of FR2 of the SCG in (NG)EN-DC. When indicated to address power saving, this maximum aggregated bandwidth includes carrier(s) of FR2 of the cell group that this UE assistance information is associated with. The aggregated bandwidth can only range up to the current active configuration when indicated to address power savings. |
reducedCCsDL Indicates the UE's preference on reduced configuration corresponding to the maximum number of downlink SCells indicated by the field, to address overheating or power saving. When indicated to address overheating, this maximum number includes both SCells of the NR MCG and PSCell/SCells of the SCG. This maximum number only includes PSCell/SCells of the SCG in (NG)EN-DC. When indicated to address power saving, this maximum number includes PSCell/SCells of the cell group that this UE assistance information is associated with. The maximum number of downlink SCells can only range up to the current active configuration when indicated to address power savings. |
reducedCCsUL Indicates the UE's preference on reduced configuration corresponding to the maximum number of uplink SCells indicated by the field, to address overheating or power saving. When indicated to address overheating, this maximum number includes both SCells of the NR MCG and PSCell/SCells of the SCG. This maximum number only includes PSCell/SCells of the SCG in (NG)EN-DC. When indicated to address power saving, this maximum number includes PSCell/SCells of the cell group that this UE assistance information is associated with. The maximum number of uplink SCells can only range up to the current active configuration when indicated to address power savings. |
reducedMIMO-LayersFR1-DL Indicates the UE's preference on reduced configuration corresponding to the maximum number of downlink MIMO layers of each serving cell operating on FR1 indicated by the field, to address overheating or power saving. This field is allowed to be reported only when UE is configured with serving cells operating on FR1. The maximum number of downlink MIMO layers can only range up to the maximum number of MIMO layers configured across all activated downlink carrier(s) of FR1 in the cell group when indicated to address power savings. |
reducedMIMO-LayersFR1-UL Indicates the UE's preference on reduced configuration corresponding to the maximum number of uplink MIMO layers of each serving cell operating on FR1 indicated by the field, to address overheating or power saving. This field is allowed to be reported only when UE is configured with serving cells operating on FR1. The maximum number of uplink MIMO layers can only range up to the maximum number of MIMO layers configured across all activated uplink carrier(s) of FR1 in the cell group when indicated to address power savings. |
reducedMIMO-LayersFR2-DL Indicates the UE's preference on reduced configuration corresponding to the maximum number of downlink MIMO layers of each serving cell operating on FR2 indicated by the field, to address overheating or power saving. This field is allowed to be reported only when UE is configured with serving cells operating on FR2. The maximum number of downlink MIMO layers can only range up to the maximum number of MIMO layers configured across all activated downlink carrier(s) of FR2 in the cell group when indicated to address power savings. |
reducedMIMO-LayersFR2-UL Indicates the UE's preference on reduced configuration corresponding to the maximum number of uplink MIMO layers of each serving cell operating on FR2 indicated by the field, to address overheating or power saving. This field is allowed to be reported only when UE is configured with serving cells operating on FR2. The maximum number of uplink MIMO layers can only range up to the maximum number of MIMO layers configured across all activated uplink carrier(s) of FR2 in the cell group when indicated to address power savings. |
referenceTimeInfoPreference Indicates whether the UE prefers being provisioned with the timing information specified in the IE ReferenceTimeInfo. |
sl-QoS-FlowIdentity This identity uniquely identifies one sidelink QoS flow between the UE and the network in the scope of UE, which is unique for different destination and cast type. |
sl-UE-AssistanceInformationNR Indicates the traffic characteristic of sidelink logical channel(s), specified in the IE SL-TrafficPatternInfo, that are setup for NR sidelink communication. |
type1 Indicates the preferred amount of increment/decrement to the long DRX cycle length with respect to the current configuration. Value in number of milliseconds. Value ms40 corresponds to 40 milliseconds, msMinus40 corresponds to -40 milliseconds and so on. |
victimSystemType Indicate the list of victim system types to which IDC interference is caused from NR when configured with UL CA. Value gps, glonass, bds, galileo and navIC indicates the type of GNSS. Value wlan indicates WLAN and value bluetooth indicates Bluetooth. |
SL-TrafficPatternInfo field descriptions |
messageSize Indicates the maximum TB size based on the observed traffic pattern. The value refers to the index of TS 38.321 [3], table 6.1.3.1-2. |
timingOffset This field indicates the estimated timing for a packet arrival in a sidelink logical channel. Specifically, the value indicates the timing offset with respect to subframe#0 of SFN#0 in milliseconds. |
trafficPeriodicity This field indicates the estimated data arrival periodicity in a sidelink logical channel. Value ms20 corresponds to 20 ms, ms50 corresponds to 50 ms and so on. |
IE/Group Name | Presence | Range | IE type and reference | Semantics description |
Expected UE Activity Behaviour | O | 9.3.1.94 | ||
Expected HO Interval | O | ENUMERATED (sec15, sec30, sec60, sec90, sec120, sec180, long-time, ...) | Indicates the expected time interval between inter NG-RAN node handovers. If "long-time" is included, the interval between inter NG-RAN node handovers is expected to be longer than 180 seconds. | |
Expected UE Mobility | O | ENUMERATED (stationary, mobile, ...) | Indicates whether the UE is expected to be stationary or mobile. | |
Expected UE Moving Trajectory | 0..1 | Indicates the UE's expected geographical movement. | ||
>Expected UE Moving Trajectory Item | 1..<maxnoofCellsUEMovingTrajectory> | Includes list of visited and non-visited cells, where visited cells are listed in the order the UE visited them with the most recent cell being the first in the list. Non-visited cells are included immediately after the visited cell they are associated with. | ||
>>NG-RAN CGI | M | 9.3.1.73 | ||
>>Time Stayed in Cell | O | INTEGER (0..4095) | Included for visited cells and indicates the time a UE stayed in a cell in seconds. If the UE stays in a cell more than 4095 seconds, this IE is set to 4095. |
IE/GroupName | Presence | Range | IE type and reference | Semantics description |
UE Identity Index Value | M | 9.3.3.23 | ||
UE Specific DRX | O | PagingDRX9.3.1.90 | ||
Periodic Registration Update Timer | M | 9.3.3.24 | ||
MICO Mode Indication | O | 9.3.1.23 | ||
TAI List for RRC Inactive | 1 | |||
> TAI List for RRC Inactive Item | 1..<masnoofTAIforInactive> | |||
>> TAI | M | 9.3.3.11 | ||
Expected UE Behaviour | O | 9.3.1.93 |
Rangebound | Explanation |
maxnoofTAIforInactive | Maximum no. of TAIs for RRC Inactive. Value is 16. |
IE/GroupName | Presence | Range | IE type and reference | Semantics description |
CHOICE UE Identity Index Value | ||||
>Index Length 10 | ||||
>>Index Length 10 | M | BIT STRING (SIZE(10)) | Coded as specified in TS 38.304 [12] and TS 36.304 [29] |
IE/GroupName | Presence | Range | IE type and reference | Semantics description |
Periodic Registration Update Timer | M | BIT STRING (SIZE(8)) | Bits 5 to 1 represent the binary coded timer value.Bits 6 to 8 define the timer value unit for the Periodic Registration Update Timer as follows: Bits 876 000 value is incremented in multiples of 10 minutes 001 value is incremented in multiples of 1 hour 010 value is incremented in multiples of 10 hours 011 value is incremented in multiples of 2 seconds 100 value is incremented in multiples of 30 seconds 101 value is incremented in multiples of 1 minute 111 value indicates that the timer is deactivated. Other values shall be interpreted as multiples of 1 hour in this version of the protocol. |
IE/GroupName | Presence | Range | IE type and reference | Semantics description |
Expected UE Behaviour | O | 9.3.1.93 | This IE may be present in case the Core Network Assistance Information for RRC INACTIVE IE is not included and is ignored otherwise. |
Interface Type | Message Type | UE Event Name |
NGAP | Expected UE Behavior | Expected UE Behavior |
RRC | UE Assistance Information | UE Assistance Information |
Parameter ID | Parameter Name | Parameter Type | Parameter Definition | Parameter Description |
1 | O-RAN UE ID | OCTET STRING | O-RAN UE ID structure as per <ref> | Call Setup, Release and Modify Event` |
... | ... | ... | ... | ... |
7 | Expected UE behavior | OCTET STRING | Expected UE Behavior IE in TS 38.413 9.3.1.93 | |
8 | UE assistance information | OCTET STRING | UE Assistance Information TS 38.331 |
Claims (15)
- RIC(RAN(radio access network) intelligent controller)에 의해 수행되는 방법에 있어서,E2 노드로부터 보고 메시지를 수신하는 과정과,상기 보고 메시지에 기반하여 제어 메시지를 생성하는 과정과,상기 제어 메시지를 상기 E2 노드에게 전송하는 과정을 포함하고,상기 제어 메시지는, 상기 E2 노드와 관련된 RAN 구성(configuration)을 포함하고,상기 보고 메시지는, UE(user equipment)로부터 전송된 UE 보조 정보(UE assistance information)와 AMF(Access and Mobility management Function)로부터 전송된 UE 예상 행동 관련 정보 중 적어도 하나를 포함하는 방법.
- 청구항 1에 있어서, 상기 UE 보조 정보는, C-DRX(connected-discontinuous reception) 주기의 조정에 관한 상기 UE의 선호 옵션 정보 선호 옵션 정보 및 발열 발생 여부 및 발열 제어에 대한 상기 UE의 선호 옵션 정보를 포함하는 방법.
- 청구항 1에 있어서, 상기 UE 예상 행동 관련 정보는 상기 AMF의 N2 메시지 중에서 코어 네트워크 보조 정보(Core Network Assistance Information) 또는 CN-보조 RAN 파라미터 튜닝(CN Assisted RAN parameters tuning)의 IE로부터 전달되는 방법.
- 청구항 1에 있어서, 상기 UE 예상 행동 관련 정보는 핸드오버 예상 시간 정보, UE의 상태가 고정인지 이동 중인지 여부를 나타내는 정보, UE의 지리적 이동과 관련된 정보를 포함하는 방법.
- 청구항 1에 있어서,상기 E2 노드는 gNB(gNodeB), gNB-CU(centralized unit), 또는 gNB-CU-CP(control plane)이고,상기 RAN 구성은 상기 보고 메시지에 기반하여 생성되고,상기 RAN 구성은 RAN 페이징(paging) 구성, RNA(RAN notification area) 구성, 측정 구성(measurement configuration) 중 적어도 하나를 포함하는 방법.
- 청구항 1에 있어서,상기 UE 예상 행동 관련 정보는 상기 UE가 이전에 방문한 셀들 및 방문하지 않은 셀들을 나타내는 예상 UE 이동 궤적의 정보를 포함하는 방법.
- 청구항 1에 있어서,상기 UE 예상 행동 관련 정보는 상기 UE가 각각의 방문한 셀에 머문 시간의 길이를 나타내는 정보를 포함하는 방법.
- E2 노드에 의해 수행되는 방법에 있어서,RIC(RAN(radio access network) intelligent controller)에게 보고 메시지를 전송하는 과정과,상기 보고 메시지에 기반하여 생성된 제어 메시지를 상기 E2 노드로부터 수신하는 과정을 포함하고,상기 제어 메시지는, 상기 E2 노드와 관련된 RAN 구성(configuration)을 포함하고,상기 보고 메시지는, UE(user equipment)로부터 전송된 UE 보조 정보(UE assistance information)와 AMF(Access and Mobility management Function)로부터 전송된 UE 예상 행동 관련 정보 중 적어도 하나를 포함하는 방법.
- 청구항 8에 있어서, 상기 UE 보조 정보는, C-DRX(connected-discontinuous reception) 주기의 조정에 관한 상기 UE의 선호 옵션 정보 선호 옵션 정보 및 발열 발생 여부 및 발열 제어에 대한 상기 UE의 선호 옵션 정보를 포함하는 방법.
- 청구항 8에 있어서, 상기 UE 예상 행동 관련 정보는 상기 AMF의 N2 메시지 중에서 코어 네트워크 보조 정보(Core Network Assistance Information) 또는 CN-보조 RAN 파라미터 튜닝(CN Assisted RAN parameters tuning)의 IE로부터 전달되는 방법.
- 청구항 8에 있어서, 상기 UE 예상 행동 관련 정보는 핸드오버 예상 시간 정보, UE의 상태가 고정인지 이동 중인지 여부를 나타내는 정보, UE의 지리적 이동과 관련된 정보를 포함하는 방법.
- 청구항 8에 있어서,상기 E2 노드는 gNB(gNodeB), gNB-CU(centralized unit), 또는 gNB-CU-CP(control plane)이고,상기 RAN 구성은 상기 보고 메시지에 기반하여 생성되고,상기 RAN 구성은 RAN 페이징(paging) 구성, RNA(RAN notification area) 구성, 측정 구성(measurement configuration) 중 적어도 하나를 포함하는 방법.
- 청구항 8에 있어서,상기 UE 예상 행동 관련 정보는,상기 UE가 이전에 방문한 셀들 및 방문하지 않은 셀들을 나타내는 예상 UE 이동 궤적의 정보, 또는,상기 UE가 각각의 방문한 셀에 머문 시간의 길이를 나타내는 정보 중 적어도 하나를 포함하는 방법.
- RIC(RAN(radio access network) intelligent controller)의 장치에 있어서,적어도 하나의 송수신기와,적어도 하나의 프로세서를 포함하고,상기 적어도 하나의 프로세서는 청구항 1 내지 청구항 7 중 하나의 항에 따른 방법을 수행하도록 구성된 장치.
- E2 노드의 장치에 있어서,적어도 하나의 송수신기와,적어도 하나의 프로세서를 포함하고,상기 적어도 하나의 프로세서는 청구항 8 내지 청구항 13 중 하나의 항에 따른 방법을 수행하도록 구성된 장치.
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"3 Generation Partnership Project; Technical Specification Group Radio Access Network; NG-RAN; NG Application Protocol (NGAP) (Release 16)", 3GPP STANDARD; TECHNICAL SPECIFICATION; 3GPP TS 38.413, 3RD GENERATION PARTNERSHIP PROJECT (3GPP), MOBILE COMPETENCE CENTRE ; 650, ROUTE DES LUCIOLES ; F-06921 SOPHIA-ANTIPOLIS CEDEX ; FRANCE, vol. RAN WG3, no. V16.5.0, 9 April 2021 (2021-04-09), Mobile Competence Centre ; 650, route des Lucioles ; F-06921 Sophia-Antipolis Cedex ; France , pages 1 - 473, XP052000763 * |
"3rd Generation Partnership Project; Technical Specification Group Radio Access Network; NR; Radio Resource Control (RRC) protocol specification (Release 16)", 3GPP STANDARD; TECHNICAL SPECIFICATION; 3GPP TS 38.331, 3RD GENERATION PARTNERSHIP PROJECT (3GPP), MOBILE COMPETENCE CENTRE ; 650, ROUTE DES LUCIOLES ; F-06921 SOPHIA-ANTIPOLIS CEDEX ; FRANCE, vol. RAN WG2, no. V16.4.1, 30 March 2021 (2021-03-30), Mobile Competence Centre ; 650, route des Lucioles ; F-06921 Sophia-Antipolis Cedex ; France , pages 1 - 949, XP052000246 * |
3GPP TS 38.331 |
3GPP TS 38.413 |
ANONYMOUS: "O-RAN SOFTWARE COMMUNITY "A" RELEASE REQUIREMENTS. O-RAN SC Ver A SW Requirements ", 3GPP, 24 June 2020 (2020-06-24), XP055980442 * |
See also references of EP4301056A4 |
Cited By (2)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
WO2024112327A1 (en) * | 2022-11-22 | 2024-05-30 | Altiostar Networks India Private Limited | Methods for deriving periodic ran notification area (rna) update timer (t380) for rrc-inactive ues |
WO2024149162A1 (zh) * | 2023-01-10 | 2024-07-18 | 中国移动通信有限公司研究院 | 一种信息订阅方法及装置、通信设备 |
Also Published As
Publication number | Publication date |
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KR20220146984A (ko) | 2022-11-02 |
US20230224689A1 (en) | 2023-07-13 |
CN117204070A (zh) | 2023-12-08 |
EP4301056A4 (en) | 2024-08-07 |
EP4301056A1 (en) | 2024-01-03 |
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