WO2021237435A1 - Appareil et procédé pour motiver un transfert vers une cellule d'ancrage 5g dans des contextes à haut débit de données - Google Patents

Appareil et procédé pour motiver un transfert vers une cellule d'ancrage 5g dans des contextes à haut débit de données Download PDF

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Publication number
WO2021237435A1
WO2021237435A1 PCT/CN2020/092232 CN2020092232W WO2021237435A1 WO 2021237435 A1 WO2021237435 A1 WO 2021237435A1 CN 2020092232 W CN2020092232 W CN 2020092232W WO 2021237435 A1 WO2021237435 A1 WO 2021237435A1
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WIPO (PCT)
Prior art keywords
anchor
handover
neighbor cell
cell
component
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PCT/CN2020/092232
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English (en)
Inventor
Yuankun ZHU
Fojian ZHANG
Chaofeng HUI
Pan JIANG
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Qualcomm Incorporated
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Publication date
Application filed by Qualcomm Incorporated filed Critical Qualcomm Incorporated
Priority to PCT/CN2020/092232 priority Critical patent/WO2021237435A1/fr
Publication of WO2021237435A1 publication Critical patent/WO2021237435A1/fr

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    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04W—WIRELESS COMMUNICATION NETWORKS
    • H04W36/00—Hand-off or reselection arrangements
    • H04W36/0005—Control or signalling for completing the hand-off
    • H04W36/0055—Transmission or use of information for re-establishing the radio link
    • H04W36/0058—Transmission of hand-off measurement information, e.g. measurement reports
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04W—WIRELESS COMMUNICATION NETWORKS
    • H04W36/00—Hand-off or reselection arrangements
    • H04W36/24—Reselection being triggered by specific parameters
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04W—WIRELESS COMMUNICATION NETWORKS
    • H04W36/00—Hand-off or reselection arrangements
    • H04W36/0005—Control or signalling for completing the hand-off
    • H04W36/0055—Transmission or use of information for re-establishing the radio link
    • H04W36/0061—Transmission or use of information for re-establishing the radio link of neighbour cell information
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04W—WIRELESS COMMUNICATION NETWORKS
    • H04W36/00—Hand-off or reselection arrangements
    • H04W36/14—Reselecting a network or an air interface
    • H04W36/144—Reselecting a network or an air interface over a different radio air interface technology

Definitions

  • the present disclosure relates generally to communication systems, and more particularly, to wireless devices configured to motivate handover to a 5G anchor cell in a high data throughput context.
  • Wireless communication systems are widely deployed to provide various telecommunication services such as telephony, video, data, messaging, and broadcasts.
  • Typical wireless communication systems may employ multiple-access technologies capable of supporting communication with multiple users by sharing available system resources. Examples of such multiple-access technologies include code division multiple access (CDMA) systems, time division multiple access (TDMA) systems, frequency division multiple access (FDMA) systems, orthogonal frequency division multiple access (OFDMA) systems, single-carrier frequency division multiple access (SC-FDMA) systems, and time division synchronous code division multiple access (TD-SCDMA) systems.
  • CDMA code division multiple access
  • TDMA time division multiple access
  • FDMA frequency division multiple access
  • OFDMA orthogonal frequency division multiple access
  • SC-FDMA single-carrier frequency division multiple access
  • TD-SCDMA time division synchronous code division multiple access
  • 5G New Radio is part of a continuous mobile broadband evolution promulgated by Third Generation Partnership Project (3GPP) to meet new requirements associated with latency, reliability, security, scalability (e.g., with Internet of Things (IoT) ) , and other requirements.
  • 3GPP Third Generation Partnership Project
  • 5G NR includes services associated with enhanced mobile broadband (eMBB) , massive machine type communications (mMTC) , and ultra reliable low latency communications (URLLC) .
  • eMBB enhanced mobile broadband
  • mMTC massive machine type communications
  • URLLC ultra reliable low latency communications
  • 5G NR may be based on the 4G Long Term Evolution (LTE) standard.
  • LTE Long Term Evolution
  • a 5G NR-capable user equipment may be connected to a serving cell.
  • the UE may be connected to a non-5G serving LTE cell in the RRC_CONNECTED state.
  • the UE will be unable to leverage its 5G NR capabilities.
  • the UE in order to acquire 5G NR service, the UE must detect a predetermined measurement condition with respect to a particular cell offering 5G NR service, and report the measurement condition to the serving cell.
  • the serving cell may require the UE to determine that a neighboring cell provides superior signal quality to the UE, and send a reporting measurement identifying the neighboring cell to the non-5G serving LTE cell.
  • the UE may be within range of one or more 5G NR anchor cells, the 5G NR anchor cells may not meet the measurement condition configured by the serving cell for handover. Consequently, the UE will be unable acquire 5G NR service even in high data throughput contexts better suited for or even demanding 5G NR features.
  • the present disclosure provides configured techniques for enabling a UE to trigger a handover to a 5G NR anchor cell when the UE detects a high data throughput context. For example, it may be desirable for a UE to generate a LTE measurement event report to trigger a handover to a 5G NR anchor cell when the UE is aware of a need for high data throughput.
  • the UE may be connected to an serving cell that does not provide 5G NR service, e.g., an LTE serving cell. Further, the UE may perform measurements on neighbor cells, identify the neighbor cells that are 5G anchor cells, and determine if any of the identified 5G anchor cells have a measurement value higher than a predetermined threshold.
  • the UE may identify that the UE is in a high data throughput context over a predetermined period of time.
  • the UE may send a measurement report to the anchor cell independent of an occurrence of a measurement condition associated with the measurement report.
  • the UE may receive a handover command for a handover to the 5G anchor cell. Consequently, the UE will be handed over to the 5G anchor cell and be able to acquire 5G service via the 5G anchor cell.
  • the 5G anchor cell is a LTE eNodeB in a Evolved Universal Mobile Telecommunications System (UMTS) Terrestrial Radio Access Network (E-UTRAN) New Radio –Dual Connectivity (ENDC) implementation
  • UMTS Evolved Universal Mobile Telecommunications System
  • E-UTRAN Evolved Universal Mobile Telecommunications System
  • E-UTRAN Evolved Universal Mobile Telecommunications System
  • E-UTRAN Evolved Universal Mobile Telecommunications System
  • E-UTRAN Evolved Universal Mobile Telecommunications System
  • E-UTRAN Evolved Universal Mobile Telecommunications System
  • E-UTRAN Evolved Universal Mobile Telecommunications System
  • E-UTRAN Evolved Universal Mobile Telecommunications System
  • E-UTRAN Evolved Universal Mobile Telecommunications System
  • E-UTRAN Evolved Universal Mobile Telecommunications System
  • E-UTRAN Evolved Universal Mobile Telecommunications System
  • E-UTRAN Evolved Universal Mobile Telecommunications System
  • E-UTRAN
  • the disclosure provides a method for motivating handover to a 5G anchor cell in a high data throughput context.
  • the method may include determining, by a wireless device connected to a non-5G serving cell, a signal measurement of an anchor neighbor cell, identifying, by the wireless device, a data throughput context, determining, by the wireless device, that the signal measurement is greater than a threshold, sending, based on the identifying and the determining, a measurement report to the anchor neighbor cell; and receiving, from the anchor neighbor cell , a handover command for a handover to the anchor neighbor cell in response to the measurement report.
  • the disclosure also provides an apparatus (e.g., a user equipment (UE) ) including a memory storing computer-executable instructions and at least one processor configured to execute the computer-executable instructions to perform the above method, an apparatus including means for performing the above method, and a non-transitory computer-readable medium storing computer-executable instructions for performing the above method.
  • UE user equipment
  • the one or more aspects comprise the features hereinafter fully described and particularly pointed out in the claims.
  • the following description and the annexed drawings set forth in detail certain illustrative features of the one or more aspects. These features are indicative, however, of but a few of the various ways in which the principles of various aspects may be employed, and this description is intended to include all such aspects and their equivalents.
  • FIG. 1 is a diagram illustrating an example of a wireless communications system and an access network.
  • FIGS. 2A, 2B, 2C, and 2D are diagrams illustrating examples of a first 5G/NR frame, DL channels within a 5G/NR subframe, a second 5G/NR frame, and UL channels within a 5G/NR subframe, respectively.
  • FIG. 3 is a diagram illustrating an example of a base station and user equipment (UE) in an access network.
  • UE user equipment
  • FIG. 4 is a diagram illustrating example communications and components of base stations and a UE.
  • FIG. 5 is a flowchart of a method of wireless communication.
  • FIG. 6 is a flowchart of a method of wireless communication.
  • FIG. 7 is a conceptual data flow diagram illustrating the data flow between different means/components in an example UE.
  • processors include microprocessors, microcontrollers, graphics processing units (GPUs) , central processing units (CPUs) , application processors, digital signal processors (DSPs) , reduced instruction set computing (RISC) processors, systems on a chip (SoC) , baseband processors, field programmable gate arrays (FPGAs) , programmable logic devices (PLDs) , state machines, gated logic, discrete hardware circuits, and other suitable hardware configured to perform the various functionality described throughput this disclosure.
  • processors in the processing system may execute software.
  • Software shall be construed broadly to mean instructions, instruction sets, code, code segments, program code, programs, subprograms, software components, applications, software applications, software packages, routines, subroutines, objects, executables, threads of execution, procedures, functions, etc., whether referred to as software, firmware, middleware, microcode, hardware description language, or otherwise.
  • the functions described may be implemented in hardware, software, or any combination thereof. If implemented in software, the functions may be stored on or encoded as one or more instructions or code on a computer-readable medium.
  • Computer-readable media includes computer storage media. Storage media may be any available media that can be accessed by a computer.
  • such computer-readable media can comprise a random-access memory (RAM) , a read-only memory (ROM) , an electrically erasable programmable ROM (EEPROM) , optical disk storage, magnetic disk storage, other magnetic storage devices, combinations of the aforementioned types of computer-readable media, or any other medium that can be used to store computer executable code in the form of instructions or data structures that can be accessed by a computer.
  • RAM random-access memory
  • ROM read-only memory
  • EEPROM electrically erasable programmable ROM
  • optical disk storage magnetic disk storage
  • magnetic disk storage other magnetic storage devices
  • combinations of the aforementioned types of computer-readable media or any other medium that can be used to store computer executable code in the form of instructions or data structures that can be accessed by a computer.
  • FIG. 1 is a diagram illustrating an example of a wireless communications system and an access network 100.
  • the wireless communications system (also referred to as a wireless wide area network (WWAN) ) includes base stations 102, UEs 104, an Evolved Packet Core (EPC) 160, and another core network 190 (e.g., a 5G Core (5GC) ) .
  • the base stations 102 may include macrocells (high power cellular base station) and/or small cells (low power cellular base station) .
  • the macrocells include base stations.
  • the small cells include femtocells, picocells, and microcells.
  • the base stations 102 configured for 4G LTE may interface with the EPC 160 through first backhaul links 132 (e.g., S1 interface) .
  • the base stations 102 configured for 5G NR may interface with core network 190 through second backhaul links 184.
  • the base stations 102 may perform one or more of the following functions: transfer of user data, radio channel ciphering and deciphering, integrity protection, header compression, mobility control functions (e.g., handover, dual connectivity) , inter-cell interference coordination, connection setup and release, load balancing, distribution for non-access stratum (NAS) messages, NAS node selection, synchronization, radio access network (RAN) sharing, multimedia broadcast multicast service (MBMS) , subscriber and equipment trace, RAN information management (RIM) , paging, positioning, and delivery of warning messages.
  • NAS non-access stratum
  • RAN radio access network
  • MBMS multimedia broadcast multicast service
  • RIM RAN information management
  • the base stations 102 may communicate directly or indirectly (e.g., through the EPC 160 or core network 190) with each other over third backhaul links 134 (e.g., X2 interface) .
  • the third backhaul links 134 may be wired or wireless.
  • the base stations 102 may wirelessly communicate with the UEs 104. Each of the base stations 102 may provide communication coverage for a respective geographic coverage area 110. There may be overlapping geographic coverage areas 110. For example, the small cell 102' may have a coverage area 110' that overlaps the coverage area 110 of one or more macro base stations 102.
  • a network that includes both small cell and macrocells may be known as a heterogeneous network.
  • a heterogeneous network may also include Home Evolved Node Bs (eNBs) (HeNBs) , which may provide service to a restricted group known as a closed subscriber group (CSG) .
  • eNBs Home Evolved Node Bs
  • HeNBs Home Evolved Node Bs
  • CSG closed subscriber group
  • the communication links 120 between the base stations 102 and the UEs 104 may include uplink (UL) (also referred to as reverse link) transmissions from a UE 104 to a base station 102 and/or downlink (DL) (also referred to as forward link) transmissions from a base station 102 to a UE 104.
  • the communication links 120 may use multiple-input and multiple-output (MIMO) antenna technology, including spatial multiplexing, beamforming, and/or transmit diversity.
  • the communication links may be through one or more carriers.
  • the base stations 102 /UEs 104 may use spectrum up to Y MHz (e.g., 5, 10, 15, 20, 100, 400, etc.
  • the component carriers may include a primary component carrier and one or more secondary component carriers.
  • a primary component carrier may be referred to as a primary cell (PCell) and a secondary component carrier may be referred to as a secondary cell (SCell) .
  • a UE 104 may include a handover motivation component 140 that is configured to motivate handover from a non-5G serving cell to a 5G anchor cell in response to a high data throughput context.
  • the non-5G serving cell and the 5G anchor cell may be examples of the base stations 102.
  • the handover motivation component 140 may include a configuration component 141 configured to receive a neighbor cell list, an anchor band component 142 configured to determine that a frequency of at least one anchor neighbor cell in the neighbor cell list corresponds to a frequency band supporting a 5G non-stand-alone network, a measurement component 143 that measures service attributes of the base stations 102.
  • the measurement component 143 may be implemented by a 4G modem of the UE 104.
  • the handover motivation component 140 may include a handover triggering component 144 and a context detection component 145.
  • the handover triggering component 144 may transmit a measurement report to the non-5G serving cell when the measurement component 143 identifies that the 5G anchor cell has a measurement value greater than a predetermined threshold and the context detection component 145 determines that the UE 104 is in a high data throughput context. Further, the handover triggering component 144 may generate and send the measurement report even though the measured service attributes of the 5G anchor cell fail to meet the condition associated with the measurement event report. In response to the measurement report, the UE may receive a handover command for a handover to the 5G anchor cell, and perform a handover from the non-5G serving cell to the 5G anchor cell.
  • one or more of the base station 102 may include a serving cell component 198.
  • the serving cell component 198 may transmit a configuration message including the neighbor cell list and transmit one or more reference signals to be used for measurements.
  • the serving cell component 198 also may transmit the handover command in response to a measurement report.
  • D2D communication link 158 may use the DL/UL WWAN spectrum.
  • the D2D communication link 158 may use one or more sidelink channels, such as a physical sidelink broadcast channel (PSBCH) , a physical sidelink discovery channel (PSDCH) , a physical sidelink shared channel (PSSCH) , and a physical sidelink control channel (PSCCH) .
  • sidelink channels such as a physical sidelink broadcast channel (PSBCH) , a physical sidelink discovery channel (PSDCH) , a physical sidelink shared channel (PSSCH) , and a physical sidelink control channel (PSCCH) .
  • sidelink channels such as a physical sidelink broadcast channel (PSBCH) , a physical sidelink discovery channel (PSDCH) , a physical sidelink shared channel (PSSCH) , and a physical sidelink control channel (PSCCH) .
  • D2D communication may be through a variety of wireless D2D communications systems, such as for example, FlashLinQ, WiMedia,
  • the wireless communications system may further include a Wi-Fi access point (AP) 150 in communication with Wi-Fi stations (STAs) 152 via communication links 154 in a 5 GHz unlicensed frequency spectrum.
  • AP Wi-Fi access point
  • STAs Wi-Fi stations
  • communication links 154 in a 5 GHz unlicensed frequency spectrum.
  • the STAs 152 /AP 150 may perform a clear channel assessment (CCA) prior to communicating in order to determine whether the channel is available.
  • CCA clear channel assessment
  • the small cell 102' may operate in a licensed and/or an unlicensed frequency spectrum. When operating in an unlicensed frequency spectrum, the small cell 102' may employ NR and use the same 5 GHz unlicensed frequency spectrum as used by the Wi-Fi AP 150. The small cell 102', employing NR in an unlicensed frequency spectrum, may boost coverage to and/or increase capacity of the access network.
  • a base station 102 may include and/or be referred to as an eNB, gNodeB (gNB) , or another type of base station.
  • Some base stations, such as gNB 180 may operate in a traditional sub 6 GHz spectrum, in millimeter wave (mmW) frequencies, and/or near mmW frequencies in communication with the UE 104.
  • mmW millimeter wave
  • mmW base station Extremely high frequency (EHF) is part of the RF in the electromagnetic spectrum.
  • EHF Extremely high frequency
  • EHF has a range of 30 GHz to 300 GHz and a wavelength between 1 millimeter and 10 millimeters. Radio waves in the band may be referred to as a millimeter wave. Near mmW may extend down to a frequency of 3 GHz with a wavelength of 100 millimeters.
  • the super high frequency (SHF) band extends between 3 GHz and 30 GHz, also referred to as centimeter wave. Communications using the mmW /near mmW radio frequency band (e.g., 3 GHz –300 GHz) has extremely high path loss and a short range.
  • the mmW base station 180 may utilize beamforming 182 with the UE 104 to compensate for the extremely high path loss and short range.
  • the base station 180 and the UE 104 may each include a plurality of antennas, such as antenna elements, antenna panels, and/or antenna arrays to facilitate the beamforming.
  • the base station 180 may transmit a beamformed signal to the UE 104 in one or more transmit directions 182'.
  • the UE 104 may receive the beamformed signal from the base station 180 in one or more receive directions 182′′ .
  • the UE 104 may also transmit a beamformed signal to the base station 180 in one or more transmit directions.
  • the base station 180 may receive the beamformed signal from the UE 104 in one or more receive directions.
  • the base station 180 /UE 104 may perform beam training to determine the best receive and transmit directions for each of the base station 180 /UE 104.
  • the transmit and receive directions for the base station 180 may or may not be the same.
  • the transmit and receive directions for the UE 104 may or may not be the same.
  • the EPC 160 may include a Mobility Management Entity (MME) 162, other MMEs 164, a Serving Gateway 166, a Multimedia Broadcast Multicast Service (MBMS) Gateway 168, a Broadcast Multicast Service Center (BM-SC) 170, and a Packet Data Network (PDN) Gateway 172.
  • MME Mobility Management Entity
  • MBMS Multimedia Broadcast Multicast Service
  • BM-SC Broadcast Multicast Service Center
  • PDN Packet Data Network
  • the MME 162 may be in communication with a Home Subscriber Server (HSS) 174.
  • HSS Home Subscriber Server
  • the MME 162 is the control node that processes the signaling between the UEs 104 and the EPC 160.
  • the MME 162 provides bearer and connection management. All user Internet protocol (IP) packets are transferred through the Serving Gateway 166, which itself is connected to the PDN Gateway 172.
  • IP Internet protocol
  • the PDN Gateway 172 provides UE IP address allocation as well as other functions.
  • the PDN Gateway 172 and the BM-SC 170 are connected to the IP Services 176.
  • the IP Services 176 may include the Internet, an intranet, an IP Multimedia Subsystem (IMS) , a PS Streaming Service, and/or other IP services.
  • the BM-SC 170 may provide functions for MBMS user service provisioning and delivery.
  • the BM-SC 170 may serve as an entry point for content provider MBMS transmission, may be used to authorize and initiate MBMS Bearer Services within a public land mobile network (PLMN) , and may be used to schedule MBMS transmissions.
  • PLMN public land mobile network
  • the MBMS Gateway 168 may be used to distribute MBMS traffic to the base stations 102 belonging to a Multicast Broadcast Single Frequency Network (MBSFN) area broadcasting a particular service, and may be responsible for session management (start/stop) and for collecting eMBMS related charging information.
  • MMSFN Multicast Broadcast Single Frequency Network
  • the core network 190 may include a Access and Mobility Management Function (AMF) 192, other AMFs 193, a Session Management Function (SMF) 194, and a User Plane Function (UPF) 195.
  • the AMF 192 may be in communication with a Unified Data Management (UDM) 196.
  • the AMF 192 is the control node that processes the signaling between the UEs 104 and the core network 190.
  • the AMF 192 provides QoS flow and session management. All user Internet protocol (IP) packets are transferred through the UPF 195.
  • the UPF 195 provides UE IP address allocation as well as other functions.
  • the UPF 195 is connected to the IP Services 197.
  • the IP Services 197 may include the Internet, an intranet, an IP Multimedia Subsystem (IMS) , a PS Streaming Service, and/or other IP services.
  • IMS IP Multimedia Subsystem
  • the base station may include and/or be referred to as a gNB, Node B, eNB, an access point, a base transceiver station, a radio base station, a radio transceiver, a transceiver function, a basic service set (BSS) , an extended service set (ESS) , a transmit reception point (TRP) , or some other suitable terminology.
  • the base station 102 provides an access point to the EPC 160 or core network 190 for a UE 104.
  • Examples of UEs 104 include a cellular phone, a smart phone, a session initiation protocol (SIP) phone, a laptop, a personal digital assistant (PDA) , a satellite radio, a global positioning system, a multimedia device, a video device, a digital audio player (e.g., MP3 player) , a camera, a game console, a tablet, a smart device, a wearable device, a vehicle, an electric meter, a gas pump, a large or small kitchen appliance, a healthcare device, an implant, a sensor/actuator, a display, or any other similar functioning device.
  • SIP session initiation protocol
  • PDA personal digital assistant
  • the UEs 104 may be referred to as IoT devices (e.g., parking meter, gas pump, toaster, vehicles, heart monitor, etc. ) .
  • the UE 104 may also be referred to as a station, a mobile station, a subscriber station, a mobile unit, a subscriber unit, a wireless unit, a remote unit, a mobile device, a wireless device, a wireless communications device, a remote device, a mobile subscriber station, an access terminal, a mobile terminal, a wireless terminal, a remote terminal, a handset, a user agent, a mobile client, a client, or some other suitable terminology.
  • FIGS. 2A-2D illustrates example diagrams 200, 230, 250, and 280 illustrating examples structures that may be used for wireless communication by UE 104, e.g., for 5G NR communication.
  • FIG. 2A is a diagram 200 illustrating an example of a first subframe within a 5G/NR frame structure.
  • FIG. 2B is a diagram 230 illustrating an example of DL channels within a 5G/NR subframe.
  • FIG. 2C is a diagram 250 illustrating an example of a second subframe within a 5G/NR frame structure.
  • FIG. 2D is a diagram 280 illustrating an example of UL channels within a 5G/NR subframe.
  • the 5G/NR frame structure may be FDD in which for a particular set of subcarriers (carrier system bandwidth) , subframes within the set of subcarriers are dedicated for either DL or UL, or may be TDD in which for a particular set of subcarriers (carrier system bandwidth) , subframes within the set of subcarriers are dedicated for both DL and UL.
  • the 5G/NR frame structure is assumed to be TDD, with subframe 4 being configured with slot format 28 (with mostly DL) , where D is DL, U is UL, and X is flexible for use between DL/UL, and subframe 3 being configured with slot format 34 (with mostly UL) .
  • slot formats 0, 1 are all DL, UL, respectively.
  • Other slot formats 2-61 include a mix of DL, UL, and flexible symbols.
  • UEs are configured with the slot format (dynamically through DL control information (DCI) , or semi-statically/statically through radio resource control (RRC) signaling) through a received slot format indicator (SFI) .
  • DCI DL control information
  • RRC radio resource control
  • SFI received slot format indicator
  • a frame (10 ms) may be divided into 10 equally sized subframes (1 ms) .
  • Each subframe may include one or more time slots.
  • Subframes may also include mini-slots, which may include 7, 4, or 2 symbols.
  • Each slot may include 7 or 14 symbols, depending on the slot configuration. For slot configuration 0, each slot may include 14 symbols, and for slot configuration 1, each slot may include 7 symbols.
  • the symbols on DL may be cyclic prefix (CP) OFDM (CP-OFDM) symbols.
  • the symbols on UL may be CP-OFDM symbols (for high data throughput scenarios) or discrete Fourier transform (DFT) spread OFDM (DFT-s-OFDM) symbols (also referred to as single carrier frequency-division multiple access (SC-FDMA) symbols) (for power limited scenarios; limited to a single stream transmission) .
  • the number of slots within a subframe is based on the slot configuration and the numerology. For slot configuration 0, different numerologies ⁇ 0 to 5 allow for 1, 2, 4, 8, 16, and 32 slots, respectively, per subframe. For slot configuration 1, different numerologies 0 to 2 allow for 2, 4, and 8 slots, respectively, per subframe.
  • the subcarrier spacing and symbol length/duration are a function of the numerology.
  • the subcarrier spacing may be equal to 2 ⁇ *15 kHz, where ⁇ is the numerology 0 to 5.
  • the symbol length/duration is inversely related to the subcarrier spacing.
  • the slot duration is 0.25 ms
  • the subcarrier spacing is 60 kHz
  • the symbol duration is approximately 16.67 ⁇ s.
  • a resource grid may be used to represent the frame structure.
  • Each time slot includes a resource block (RB) (also referred to as physical RBs (PRBs) ) that extends 12 consecutive subcarriers.
  • RB resource block
  • PRBs physical RBs
  • the resource grid is divided into multiple resource elements (REs) . The number of bits carried by each RE depends on the modulation scheme.
  • the RS may include demodulation RS (DM-RS) (indicated as Rx for one particular configuration, where 100x is the port number, but other DM-RS configurations are possible) and channel state information reference signals (CSI-RS) for channel estimation at the UE.
  • DM-RS demodulation RS
  • CSI-RS channel state information reference signals
  • the RS may also include beam measurement RS (BRS) , beam refinement RS (BRRS) , and phase tracking RS (PT-RS) .
  • BRS beam measurement RS
  • BRRS beam refinement RS
  • PT-RS phase tracking RS
  • FIG. 2B illustrates an example of various DL channels within a subframe of a frame.
  • the physical downlink control channel (PDCCH) carries DCI within one or more control channel elements (CCEs) , each CCE including nine RE groups (REGs) , each REG including four consecutive REs in an OFDM symbol.
  • a primary synchronization signal (PSS) may be within symbol 2 of particular subframes of a frame. The PSS is used by a UE 104 to determine subframe/symbol timing and a physical layer identity.
  • a secondary synchronization signal (SSS) may be within symbol 4 of particular subframes of a frame. The SSS is used by a UE to determine a physical layer cell identity group number and radio frame timing.
  • the UE can determine a physical cell identifier (PCI) . Based on the PCI, the UE can determine the locations of the aforementioned DM-RS.
  • the physical broadcast channel (PBCH) which carries a master information block (MIB) , may be logically grouped with the PSS and SSS to form a synchronization signal (SS) /PBCH block.
  • the MIB provides a number of RBs in the system bandwidth and a system frame number (SFN) .
  • the physical downlink shared channel (PDSCH) carries user data, broadcast system information not transmitted through the PBCH such as system information blocks (SIBs) , and paging messages.
  • SIBs system information blocks
  • some of the REs carry DM-RS (indicated as R for one particular configuration, but other DM-RS configurations are possible) for channel estimation at the base station.
  • the UE may transmit DM-RS for the physical uplink control channel (PUCCH) and DM-RS for the physical uplink shared channel (PUSCH) .
  • the PUSCH DM-RS may be transmitted in the first one or two symbols of the PUSCH.
  • the PUCCH DM-RS may be transmitted in different configurations depending on whether short or long PUCCHs are transmitted and depending on the particular PUCCH format used.
  • the UE may transmit sounding reference signals (SRS) .
  • the SRS may be transmitted in the last symbol of a subframe.
  • the SRS may have a comb structure, and a UE may transmit SRS on one of the combs.
  • the SRS may be used by a base station for channel quality estimation to enable frequency-dependent scheduling on the UL.
  • FIG. 2D illustrates an example of various UL channels within a subframe of a frame.
  • the PUCCH may be located as indicated in one configuration.
  • the PUCCH carries uplink control information (UCI) , such as scheduling requests, a channel quality indicator (CQI) , a precoding matrix indicator (PMI) , a rank indicator (RI) , and HARQ ACK/NACK feedback.
  • UCI uplink control information
  • the PUSCH carries data, and may additionally be used to carry a buffer status report (BSR) , a power headroom report (PHR) , and/or UCI.
  • BSR buffer status report
  • PHR power headroom report
  • FIG. 3 is a block diagram of a base station 310 in communication with a UE 350 in an access network.
  • IP packets from the EPC 160 may be provided to a controller/processor 375.
  • the controller/processor 375 implements layer 3 and layer 2 functionality.
  • Layer 3 includes a radio resource control (RRC) layer
  • layer 2 includes a service data adaptation protocol (SDAP) layer, a packet data convergence protocol (PDCP) layer, a radio link control (RLC) layer, and a medium access control (MAC) layer.
  • RRC radio resource control
  • SDAP service data adaptation protocol
  • PDCP packet data convergence protocol
  • RLC radio link control
  • MAC medium access control
  • the controller/processor 375 provides RRC layer functionality associated with broadcasting of system information (e.g., MIB, SIBs) , RRC connection control (e.g., RRC connection paging, RRC connection establishment, RRC connection modification, and RRC connection release) , inter radio access technology (RAT) mobility, and measurement configuration for UE measurement reporting; PDCP layer functionality associated with header compression /decompression, security (ciphering, deciphering, integrity protection, integrity verification) , and handover support functions; RLC layer functionality associated with the transfer of upper layer packet data units (PDUs) , error correction through ARQ, concatenation, segmentation, and reassembly of RLC service data units (SDUs) , re-segmentation of RLC data PDUs, and reordering of RLC data PDUs; and MAC layer functionality associated with mapping between logical channels and transport channels, multiplexing of MAC SDUs onto transport blocks (TBs) , demultiplexing of MAC SDU
  • the transmit (TX) processor 316 and the receive (RX) processor 370 implement layer 1 functionality associated with various signal processing functions.
  • Layer 1 which includes a physical (PHY) layer, may include error detection on the transport channels, forward error correction (FEC) coding/decoding of the transport channels, interleaving, rate matching, mapping onto physical channels, modulation/demodulation of physical channels, and MIMO antenna processing.
  • the TX processor 316 handles mapping to signal constellations based on various modulation schemes (e.g., binary phase-shift keying (BPSK) , quadrature phase-shift keying (QPSK) , M-phase-shift keying (M-PSK) , M-quadrature amplitude modulation (M-QAM) ) .
  • BPSK binary phase-shift keying
  • QPSK quadrature phase-shift keying
  • M-PSK M-phase-shift keying
  • M-QAM M-quadrature amplitude modulation
  • the coded and modulated symbols may then be split into parallel streams.
  • Each stream may then be mapped to an OFDM subcarrier, multiplexed with a reference signal (e.g., pilot) in the time and/or frequency domain, and then combined together using an Inverse Fast Fourier Transform (IFFT) to produce a physical channel carrying a time domain OFDM symbol stream.
  • IFFT Inverse Fast Fourier Transform
  • the OFDM stream is spatially precoded to produce multiple spatial streams.
  • Channel estimates from a channel estimator 374 may be used to determine the coding and modulation scheme, as well as for spatial processing.
  • the channel estimate may be derived from a reference signal and/or channel condition feedback transmitted by the UE 350.
  • Each spatial stream may then be provided to a different antenna 320 via a separate transmitter 318TX.
  • Each transmitter 318TX may modulate an RF carrier with a respective spatial stream for transmission.
  • each receiver 354RX receives a signal through its respective antenna 352.
  • Each receiver 354RX recovers information modulated onto an RF carrier and provides the information to the receive (RX) processor 356.
  • the TX processor 368 and the RX processor 356 implement layer 1 functionality associated with various signal processing functions.
  • the RX processor 356 may perform spatial processing on the information to recover any spatial streams destined for the UE 350. If multiple spatial streams are destined for the UE 350, they may be combined by the RX processor 356 into a single OFDM symbol stream.
  • the RX processor 356 then converts the OFDM symbol stream from the time-domain to the frequency domain using a Fast Fourier Transform (FFT) .
  • FFT Fast Fourier Transform
  • the frequency domain signal comprises a separate OFDM symbol stream for each subcarrier of the OFDM signal.
  • the symbols on each subcarrier, and the reference signal are recovered and demodulated by determining the most likely signal constellation points transmitted by the base station 310. These soft decisions may be based on channel estimates computed by the channel estimator 358.
  • the soft decisions are then decoded and deinterleaved to recover the data and control signals that were originally transmitted by the base station 310 on the physical channel.
  • the data and control signals are then provided to the controller/processor 359, which implements layer 3 and layer 2 functionality.
  • the controller/processor 359 can be associated with a memory 360 that stores program codes and data.
  • the memory 360 may be referred to as a computer-readable medium.
  • the controller/processor 359 provides demultiplexing between transport and logical channels, packet reassembly, deciphering, header decompression, and control signal processing to recover IP packets from the EPC 160.
  • the controller/processor 359 is also responsible for error detection using an ACK and/or NACK protocol to support HARQ operations.
  • the controller/processor 359 provides RRC layer functionality associated with system information (e.g., MIB, SIBs) acquisition, RRC connections, and measurement reporting; PDCP layer functionality associated with header compression /decompression, and security (ciphering, deciphering, integrity protection, integrity verification) ; RLC layer functionality associated with the transfer of upper layer PDUs, error correction through ARQ, concatenation, segmentation, and reassembly of RLC SDUs, re-segmentation of RLC data PDUs, and reordering of RLC data PDUs; and MAC layer functionality associated with mapping between logical channels and transport channels, multiplexing of MAC SDUs onto TBs, demultiplexing of MAC SDUs from TBs, scheduling information reporting, error correction through HARQ, priority handling, and logical channel prioritization.
  • RRC layer functionality associated with system information (e.g., MIB, SIBs) acquisition, RRC connections, and measurement reporting
  • PDCP layer functionality associated with
  • Channel estimates derived by a channel estimator 358 from a reference signal or feedback transmitted by the base station 310 may be used by the TX processor 368 to select the appropriate coding and modulation schemes, and to facilitate spatial processing.
  • the spatial streams generated by the TX processor 368 may be provided to different antenna 352 via separate transmitters 354TX. Each transmitter 354TX may modulate an RF carrier with a respective spatial stream for transmission.
  • the UL transmission is processed at the base station 310 in a manner similar to that described in connection with the receiver function at the UE 350.
  • Each receiver 318RX receives a signal through its respective antenna 320.
  • Each receiver 318RX recovers information modulated onto an RF carrier and provides the information to a RX processor 370.
  • the controller/processor 375 can be associated with a memory 376 that stores program codes and data.
  • the memory 376 may be referred to as a computer-readable medium.
  • the controller/processor 375 provides demultiplexing between transport and logical channels, packet reassembly, deciphering, header decompression, control signal processing to recover IP packets from the UE 350. IP packets from the controller/processor 375 may be provided to the EPC 160.
  • the controller/processor 375 is also responsible for error detection using an ACK and/or NACK protocol to support HARQ operations.
  • At least one of the TX processor 368, the RX processor 356, and the controller/processor 359 may be configured to perform aspects in connection with the handover motivation component 140 of FIG. 1.
  • a UE may be connected to a serving cell that does not provide 5G NR service, e.g., an LTE anchor cell. Further, the neighboring 5G NR anchor cells may not meet measurement conditions required by the serving cell for handover. As such, the UE will be unable acquire 5G NR service even in high data throughput contexts.
  • the present disclosure provides configured techniques for enabling the UE to trigger a handover to a 5G NR anchor cell when the UE is aware of a requirement for high data throughput.
  • the UE may perform measurements with respect to a plurality of neighbor cells, and determine measurement values for each neighbor cell. For instance, the UE may determine a reference signal received power (RSRP) measurement for each neighbor cell.
  • RSRP reference signal received power
  • the UE may determine that one of the neighbor cells is a 5G anchor cell, and has a measurement value greater than a predetermined threshold.
  • the UE may send a measurement report to the anchor cell independent of an occurrence of a configured event condition associated with the measurement report. For example, the UE may transmit send the measurement report in response to the anchor cell having the measurement value greater than the predetermined threshold and the data throughput context.
  • the UE may receive a handover command for a handover to the 5G anchor cell, and perform the handover to the 5G anchor cell configured to facilitate access to 5G services.
  • the 5G anchor cell may be configured to send master node RRC messages which include secondary node RRC configuration for a 5G gNB secondary node associated with the 5G anchor cell. Further, the UE may utilize the secondary node RRC configuration to acquire 5G access from the 5G gNB.
  • master node RRC messages which include secondary node RRC configuration for a 5G gNB secondary node associated with the 5G anchor cell.
  • the UE may utilize the secondary node RRC configuration to acquire 5G access from the 5G gNB.
  • the following description may be focused on motivating a handover to a 5G anchor cell, the concepts described herein may be applicable to other similar areas, such as motivating handover to any deployment architecture providing services via a master group utilizing a first radio access technology (RAT) and a secondary group utilizing a second RAT.
  • RAT radio access technology
  • a system 400 is configured to motivate handover to a 5G anchor cell in a high data throughput context.
  • the system 400 includes a UE 104 configured to connect to both an LTE network and a 5G NR network.
  • the system 400 includes a LTE eNB 410 and an ENDC network deployment 420 including a LTE eNB 422, a 5G NR gNB 424, and the EPC 160.
  • the LTE eNB 410, the LTE eNB 422, and the 5G NR gNB 424 may be examples of the base stations 102.
  • each of the LTE eNB 410, the LTE eNB 422, and the 5G NR gNB 424 may include a serving cell component 198.
  • the serving cell component 198 may transmit a configuration message 426 for a cell of the respective base station.
  • the configuration message 426 may include a neighbor cell list 427.
  • the serving cell component 198 may also transmit reference signals 428.
  • the reference signals 428 also may be referred to as pilot signals.
  • the UE 104 may cause handover from the LTE eNB 410 (i.e., the serving cell) to the LTE eNB 422 (i.e., the 5G anchor cell) in order to acquire 5G service in a high data throughput context.
  • the LTE eNB 410 i.e., the serving cell
  • the LTE eNB 422 i.e., the 5G anchor cell
  • the UE 104 is connected to the LTE eNB 410 via the communication link 430. While connected to the LTE eNB 410, the UE 104 is restricted to the LTE service offered by the LTE eNB 410. Consequently, the UE 104 may be unable to receive acceptable service in a high data throughput context given the limitations of LTE service.
  • the ENDC network deployment 420 may make use of existing LTE infrastructure for rapid deployment of 5G NR access network technology.
  • the LTE eNB 422 may act as a master serving cell for the UE 104.
  • the LTE eNB 422 may provide control plane communication and mobility management to devices connected to the ENDC network deployment 420.
  • the 5G NR gNB 424 may act as a secondary cell of a secondary cell group, and the EPC 160 may act as a core network for LTE connections to the LTE eNB 422 and 5G NR connections to the 5G NR gNB 424.
  • the UE 104 may establish the communication link 432 to the LTE eNB 410. Additionally, the UE 104 may implement dual connectivity, and establish the connection link 434 to the 5G NR gNB 424. Dual connectivity may refer to a capability of a device to establish two or more concurrent connections using different RAT types. For example, while operating in dual connectivity, the UE 104 may separately receive LTE and 5G signals from the LTE eNB 422 and the 5G NR gNB 424, respectively, and aggregate the signals to achieve a higher throughput and a more consistent network connection.
  • the communication link 432 may be a primary communication link and the communication link 434 may be a secondary communication link.
  • the UE 104 may include an application processor 440 that executes one or more applications, a 4G modem 450, and a 5G modem 460.
  • the application processor 440 may execute an operating system of the UE 104, which in turn, controls one or more user installed applications.
  • the application processor 440 may execute the configuration component 141, the anchor band component 142, the measurement component 143, the handover triggering component 144, the context detection component 145, and the access component 146.
  • the 4G modem 450 may execute 4G LTE protocols.
  • the 4G modem 450 may include the measurement component 143 configured to perform measurements of neighbor cells, which may include interfrequency LTE cells and interRAT cells.
  • the measurement component 143 may be configured to determine the RSRP of the LTE eNB 422.
  • the 5G modem 460 may execute 5G NR protocols.
  • the 4G modem 450 and 5G modem 460 may be separate chipsets and may be individually activated or deactivated.
  • the UE 104 may be in a connected mode (e.g., RRC_CONNECTED mode) , and connected to the LTE eNB 410 via the communication link 430. Further, the UE 104 may be capable of 5G access but unable to acquire 5G access given the service limitations of the LTE eNB 410.
  • the handover motivation component 140 may facilitate handover to a 5G anchor cell (e.g., the LTE eNB 422) such that the UE 104 is able to 5G access when performing dual connectivity via the ENDC network deployment 420.
  • a 5G anchor cell e.g., the LTE eNB 422
  • the handover motivation component 140 may receive the configuration message 426 (e.g., a RRC configuration message) including the neighbor cell list 427.
  • the handover motivation component 140 may determine that the LTE eNB 422 is an anchor neighbor cell based on a frequency of the LTE eNB 422 recorded in the neighbor cell list 427.
  • the handover motivation component 140 may perform inter-frequency and/or inter-RAT measurements to determine a measurement value (e.g., signal strength) of the LTE eNB 422.
  • the handover motivation component 140 may determine whether the UE 104 is in a high data throughput context. Further, the handover motivation component 140 may determine whether the LTE eNB 422 satisfies handover criteria based on the measurement value.
  • the handover motivation component 140 may determine whether the measurement value is greater than a predetermined threshold. If the UE 104 is in a high data throughput context and the measurement value is greater than the predetermined threshold, the handover motivation component 140 may send the measurement report 470 to LTE eNB 410. In some aspects, the handover motivation component 140 may send the measurement report 470 to the LTE eNB 410 to trigger a handover even when the LTE eNB 422 fails to satisfy a condition typically associated with sending the measurement report 470. Upon receipt of the measurement report 470, the serving cell component 198 of the LTE eNB 410 may send the handover command 472 to the handover motivation component 140.
  • the UE 104 may perform a handover to the LTE eNB 422 and establish the communication link 432. Further, the US 104 may leverage the LTE eNB 422 to form the communication link 434 with the 5G gNB to obtain 5G service.
  • FIG. 5 is a flowchart 500 of a method of motivating handover to a 5G anchor cell in a high data throughput context. The method may be performed by the UE 104 including the handover motivation component 140.
  • the UE 104 may be in a connected mode (e.g., RRC_CONNECTED mode) and configured with a neighbor cell list (e.g., neighbor cell list 427) including LTE cells.
  • the UE 104 may execute LTE neighbor cell measurements on one or more 5G anchor neighbor cells.
  • the UE 104 may determine the downlink schedule rate over a period of time.
  • the UE 104 may determine whether the downlink schedule rate is greater than a threshold (e.g., the downlink schedule ratio) . If the downlink schedule rate is not greater than the threshold, the UE 104 may return to block 520.
  • a threshold e.g., the downlink schedule ratio
  • the UE 104 may determine if the RSRP measured for any of the anchor neighbor cells is greater than a threshold. If the UE 104 determines that the RSRPs measured for the anchor cell are not greater than the threshold, the UE 104 may return to block 520. If the RSRP measured for an anchor neighbor cell is greater than a threshold, the UE 104 may proceed to block 560. At block 560, the UE 104 may send a measurement report identifying the anchor neighbor cell to the serving cell. At block 570, the UE 104 may perform a handover to the anchor neighbor cell.
  • FIG. 6 is a flowchart 600 of a method of motivating handover to a 5G anchor cell in a high data throughput context.
  • the method may be performed by a UE (e.g., the UE 104, which may include the memory 360 and which may be the entire UE 104 or a component of the UE 104, such as handover motivation component 140, the TX processor 368, the RX processor 356, and/or the controller/processor 359; the UE 710) .
  • a UE e.g., the UE 104, which may include the memory 360 and which may be the entire UE 104 or a component of the UE 104, such as handover motivation component 140, the TX processor 368, the RX processor 356, and/or the controller/processor 359; the UE 710 .
  • the method 600 may include determining, by a wireless device connected to a non-5G serving cell, a signal measurement of an anchor neighbor cell.
  • the measurement component 143 may determine a signal measurement corresponding to the LTE eNB 422 via a measurement process performed on the neighbor cells of the UE 104.
  • the measurement component 442 may perform the measurement process based at least in part on instructions received in a RRC reconfiguration message. Accordingly, the UE 104, the RX processor 356, and/or the controller/processor 359 executing the measurement component 143 may provide means for determining, by a wireless device connected to a non-5G serving cell, a signal measurement of an anchor neighbor cell.
  • the block 610 may optionally include determining the RSRP of a neighbor cell.
  • the measurement component 143 may determine the RSRP of the LTE eNB 422 during a measurement process performed by the measurement component 143 on the neighbor cells of the UE 104 identified within the neighbor cell list 427.
  • the block 610 may optionally include determining that the neighbor cell is a 5G anchor cell.
  • the handover triggering component 144 may determine that the LTE eNB 422 is a 5G anchor cell configured to facilitate 5G service via the ENDC network deployment 420 and the 5G NR gNB 424.
  • the UE 104 may receive the neighbor cell list 427 indicating a plurality of neighbor cells from the LTE eNB 410.
  • the anchor band component may determine that a frequency of the LTE eNB 422 within the neighbor cell list 427 corresponds to a frequency band supporting a 5G non-stand-alone network (e.g., the 5G NR gNB 424) .
  • the method 600 may include identifying, by the wireless device, a data throughput context over a predetermined period of time.
  • the context detection component 145 may determine that the UE 104 is in a high data throughput context over a particular period of time. Further, the high data throughput context may indicate that there is need to utilize the 5G capabilities (e.g., the 5G modem 460 of the UE 104) . Accordingly, the UE 104, the RX processor 356, and/or the controller/processor 359 executing the context detection component 145 may provide means for identifying, by the wireless device, a data throughput context over a predetermined period of time.
  • the block 620 may optionally include determining a downlink schedule rate over a period of time and determining that the downlink schedule rate is greater than a downlink schedule ratio.
  • the context detection component 145 may determine the downlink schedule rate over a period of time, and determine that the downlink schedule rate is greater than the downlink schedule ratio.
  • the downlink schedule ratio may be 60%, and the period of time may be twenty seconds.
  • the downlink schedule ratio may be configurable via an application programming interface (API) provided by the UE 104.
  • API application programming interface
  • the method 600 may include determining, by the wireless device, that the signal measurement is greater than a threshold.
  • the handover triggering component 144 may determine that the signal measurement of the LTE eNB 422 is greater than a predetermined threshold. Accordingly, the UE 104, the RX processor 356, and/or the controller/processor 359 executing the handover triggering component 144 may provide means for determining, by the wireless device, that the signal measurement is greater than a threshold.
  • the block 630 may optionally include determining a RSRP of the neighbor cell is greater than a predetermined threshold.
  • the handover triggering component 144 may determine that the RSRP of the LTE eNB 422, as measured by the measurement component 143 during the periodic LTE measurement process, is greater than a predetermined threshold.
  • the threshold may be -105 dBm. In some other aspects, the threshold may be configurable via an API provided by the UE 104.
  • the method 600 may include sending, based on the identifying and the determining, a measurement report to the anchor neighbor cell.
  • the UE 104 may send the measurement report 470 to the LTE eNB 410 via the communication link 434.
  • the measurement report 470 may include an identifier identifying the LTE eNB 422, or a context of the LTE eNB 422. Accordingly, the UE 104, the TX processor 368, and/or the controller/processor 359 may provide means for determining, by the wireless device, that the signal measurement is greater than a threshold.
  • the block 640 may optionally include sending the measurement report independent of an occurrence of a condition associated with the measurement report.
  • the measurement report 470 may typically be associated with a particular condition, but the UE 104 may send the measurement report to the LTE eNB 410 to trigger handover to the LTE eNB 422 even if the condition is not currently met.
  • the condition may correspond to an attribute of a serving cell (e.g., the LTE eNB 410) or a neighbor cell (e.g., LTE eNB 422) .
  • the UE 104 may send an Event A3 message to LTE eNB 410 even though the RSRP of LTE eNB 422 is not greater than the RSRP of LTE eNB 410 by a predetermined offset.
  • the UE 104 may send an Event A4 message to LTE eNB 410 even though the RSRP of LTE eNB 422 is not greater than a predetermined threshold.
  • the UE 104 may send an Event A5 message to LTE eNB 410 even though the RSRP of LTE eNB 422 is not greater than a first predetermined threshold and the RSRP of LTE eNB 410 is less than a second predetermined threshold.
  • the method 600 includes receiving, from the anchor neighbor cell, a handover command for a handover to the anchor neighbor cell in response to the measurement report.
  • the UE 104 may receive the handover command 472 from the LTE eNB 410 indicating that the UE 104 should perform a handover from the LTE eNB 410 to the LTE eNB 422.
  • the UE 104, the RX processor 356, and/or the controller/processor 359 may provide means for receiving, from the anchor neighbor cell, a handover command for a handover to the anchor neighbor cell in response to the measurement report.
  • the method 600 may optionally include connecting to the anchor neighbor cell based on the handover; and acquiring wireless service via the anchor neighbor cell.
  • the UE 104 may perform the handover to connect the LTE eNB 422 upon receipt of the handover command 472. Further, once the UE 104 is connected to the LTE eNB 422, the UE 104 may acquire 5G service from the 5G NR gNB 424, which acts as a secondary cell to the LTE eNB 422 in the ENDC network deployment 420.
  • the UE 104, the TX processor368, the RX processor 356, and/or the controller/processor 359 may provide means for receiving, from the anchor neighbor cell, a handover command for a handover to the anchor neighbor cell in response to the measurement report.
  • FIG. 7 is a conceptual data flow diagram 700 illustrating the data flow between different means/components in an example UE 710, which may be an example of the UE 104 and include the handover motivation component 140.
  • the receiver component 720 may receive downlink signals such as the configuration message 426, reference signals 428, and the handover command 472 from one or more base stations 102 (e.g., the LTE eNB 410, LTE eNB 422, and 5G gNB) .
  • the receiver component 720 may receive the configuration message 426 from the serving cell component 198 of the LTE eNB 410.
  • the receiver component 720 may provide the configuration message 426 to the configuration component 141.
  • the receiver component 720 may provide the reference signals 428 to the measurement component 143.
  • the receiver component 720 may provide the handover command 472 to the access component 146.
  • the configuration component 141 may receive the configuration message 426 from the receiver component 720.
  • the configuration component 141 may extract the neighbor cell list 427 from the configuration message 426.
  • the neighbor cell list 427 may be a list of frequencies of neighbor cells.
  • the configuration component 141 may provide the neighbor cell list 427 to the anchor band component 142.
  • the anchor band component 142 may receive the neighbor cell list 427 from the configuration component 141.
  • the anchor band component 142 may determine whether each neighbor cell is a 5G anchor cell.
  • the anchor band component 142 may determine whether a frequency of a neighbor cell is within a 5G anchor band.
  • the anchor band component 142 may determine the 5G anchor band based on a network operator 740.
  • the handover motivation component 140 may be configured with a list of anchor bands 730 for different network operators according to a mobile country code (MCC) and mobile network code (MNC) .
  • MCC mobile country code
  • MNC mobile network code
  • the anchor bands 730 may be based on licensing information for the different network operators.
  • the anchor bands 730 may be configured within the firmware of the UE 104 and/or the handover motivation component 140 and may be updated via a system update for the UE 104.
  • the anchor band component 142 may provide neighbor cells identified as 5G anchor cells to the handover triggering component 144.
  • the measurement component 143 may receive the reference signals 428 from the receiver component 720.
  • the reference signals 428 may be received periodically while operating in the connected mode.
  • the measurement component 143 may receive the neighbor cell list 427 from the configuration component 141.
  • the measurement component 143 may determine a signal strength for each cell on the neighbor cell list 427.
  • the measurement component 143 may determine signal strengths 750 (1) - (N) (e.g., RSRPs) for LTE cells including 5G anchor cells.
  • the measurement component 143 may provide the measured signal strengths to the handover triggering component 144.
  • the context detection component 145 may determine whether the UE 104 is currently in a high data throughput context.
  • the context detection component 145 may be configured to the update the downlink schedule rate over a predetermined period of time, and determine whether the downlink schedule rate is greater than a predetermined threshold (i.e., the downlink schedule ratio) .
  • a predetermined threshold i.e., the downlink schedule ratio
  • the “downlink schedule rate” may refer to the number of downlink grants assigned to a UE divided by the maximum number of downlink grants permitted by the system.
  • the maximum number of downlink grants may be determined as the product of the amount of downlink component carriers multiplied by the amount of sub-frames over the predetermined period of time.
  • the maximum number of downlink grants may be determined according one or more other methods, e.g., the maximum number of downlink grants may be provided to the UE 104.
  • the context detection component 145 determines the number of downlink grants via the PDCCH.
  • the predetermined threshold may be 60%. Alternatively, the predetermined threshold may be configurable by a system operator or device manufacturer. The context detection component 145 may provide the handover triggering component 144 with context information indicating that the UE 104 is in a high data throughput context.
  • the handover triggering component 144 may generate a measurement report to trigger a cause a handover of the UE 104 from the from the LTE eNB 410 to the LTE eNB 422.
  • the handover triggering component 144 may generate a measurement report when the context detection component 145 determines that the UE 104 is currently in a high data throughput context and a measured signal of one of the neighbor cells identified as a 5G anchor cell has a signal strength greater than a predetermined threshold.
  • the signal strength may be a RSRP value and the predetermined threshold may be -105 decibels (dBm) .
  • the measurement value or predetermined threshold may be configurable by a system operator or device manufacturer.
  • the handover triggering component 144 may provide the measurement report to the transmitter component 760.
  • the measurement report may include at least one of an identifier or a context of the LTE eNB 422.
  • the handover triggering component 144 may be configured to retrieve the RSRP values of neighbor cells as determined by the measurement component 143, determine that the LTE eNB 422 is a 5G anchor cell, and determine that LTE eNB 422 has a RSRP greater than -105 dBm. Further, the UE 104 may send the measurement report 470 to the LTE eNB 410 via the transmitter component 760 independent of an occurrence of a condition associated with the measurement report 470. In some aspects, the measurement report 470 may be a LTE measurement reporting. trigger.
  • the UE 104 may send an Event A3 message to LTE eNB 410 even though the RSRP of LTE eNB 422 is not greater than the RSRP of LTE eNB 410 by a predetermined threshold.
  • the UE 104 may send an Event A4 message to LTE eNB 410 even though the RSRP of LTE eNB 422 is not greater than a predetermined threshold.
  • the UE 104 may send an Event A5 message to LTE eNB 410 even though the RSRP of LTE eNB 422 is not greater than a first predetermined threshold and the RSRP of LTE eNB 410 is less than a second predetermined threshold.
  • the access component 146 may perform a random access procedure with the serving cell. For instance, the access component 146 may complete a random access procedure to establish the connection link 432 with the LTE eNB 422. In the case of a 5G anchor cell, the access component 146 may obtain 5G access via the anchor neighbor cell. In some aspects, in response to the measurement report 470, the receiver component 720 may receive the handover command 472 instructing the access component 146 to perform a handover to the 5G anchor cell. Upon performance of the handover, the UE 104 may be provided 5G services via the 5G NR gNB 424 in accordance with dual connectivity procedures.
  • the apparatus may include additional components that perform each of the blocks of the algorithm in the aforementioned flowcharts of FIGS. 5-6. As such, each block in the aforementioned flowcharts of FIGS. 5-6 may be performed by a component and the apparatus may include one or more of those components.
  • the components may be one or more hardware components specifically configured to carry out the stated processes/algorithm, implemented by a processor configured to perform the stated processes/algorithm, stored within a computer-readable medium for implementation by a processor, or some combination thereof
  • enabling a UE to motivate handover to a neighbor cell in a high data throughput context prevents the UE from being unable to utilize its high data throughput capabilities.
  • the UE does not require any additional configuration or customization to motivate handover to the 5G anchor.
  • the anchor cell is associated with LTE and the neighbor cell is associated with 5G NR (e.g., a 5G anchor cell)
  • the UE is capable of motivating handover to an EN-DC deployment providing 5G service.
  • Combinations such as “at least one of A, B, or C, ” “one or more of A, B, or C, ” “at least one of A, B, and C, ” “one or more of A, B, and C, ” and “A, B, C, or any combination thereof” include any combination of A, B, and/or C, and may include multiples of A, multiples of B, or multiples of C.
  • combinations such as “at least one of A, B, or C, ” “one or more of A, B, or C, ” “at least one of A, B, and C, ” “one or more of A, B, and C, ” and “A, B, C, or any combination thereof” may be A only, B only, C only, A and B, A and C, B and C, or A and B and C, where any such combinations may contain one or more member or members of A, B, or C.

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Abstract

Un équipement utilisateur (UE) peut être configuré pour motiver un transfert vers une cellule d'ancrage 5G dans un contexte à haut débit de données. Selon certains aspects, l'UE peut déterminer une mesure de signal d'une cellule voisine d'ancrage, identifier un contexte de débit de données et déterminer que la mesure de signal est supérieure à un seuil. En outre, l'UE peut envoyer un rapport de mesure à la cellule de desserte non 5G et recevoir une commande de transfert pour un transfert vers la cellule voisine d'ancrage en réponse au rapport de mesure.
PCT/CN2020/092232 2020-05-26 2020-05-26 Appareil et procédé pour motiver un transfert vers une cellule d'ancrage 5g dans des contextes à haut débit de données WO2021237435A1 (fr)

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US20170094622A1 (en) * 2014-07-10 2017-03-30 Lg Electronics Inc. Method for performing synchronization with base station in wireless communication system, and apparatus therefor
CN110089144A (zh) * 2016-12-16 2019-08-02 三星电子株式会社 用于无线通信系统中高速移动的终端的信号测量的方法和装置
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