WO2022000470A1 - Procédé et appareil pour gérer un transfert intercellulaire entre technologies d'accès radio - Google Patents

Procédé et appareil pour gérer un transfert intercellulaire entre technologies d'accès radio Download PDF

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Publication number
WO2022000470A1
WO2022000470A1 PCT/CN2020/100139 CN2020100139W WO2022000470A1 WO 2022000470 A1 WO2022000470 A1 WO 2022000470A1 CN 2020100139 W CN2020100139 W CN 2020100139W WO 2022000470 A1 WO2022000470 A1 WO 2022000470A1
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WIPO (PCT)
Prior art keywords
cell
handover
lte
lte cell
measurement report
Prior art date
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PCT/CN2020/100139
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English (en)
Inventor
Chaofeng HUI
Bing LENG
Liang Xue
Tong Wu
Huawen CHEN
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Qualcomm Incorporated
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Publication date
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Priority to PCT/CN2020/100139 priority Critical patent/WO2022000470A1/fr
Publication of WO2022000470A1 publication Critical patent/WO2022000470A1/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
    • H04W36/0083—Determination of parameters used for hand-off, e.g. generation or modification of neighbour cell lists
    • H04W36/0085—Hand-off measurements
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
    • H04L65/00—Network arrangements, protocols or services for supporting real-time applications in data packet communication
    • H04L65/10—Architectures or entities
    • H04L65/1016—IP multimedia subsystem [IMS]
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
    • H04L65/00—Network arrangements, protocols or services for supporting real-time applications in data packet communication
    • H04L65/1066—Session management
    • H04L65/1069—Session establishment or de-establishment
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
    • H04L65/00—Network arrangements, protocols or services for supporting real-time applications in data packet communication
    • H04L65/1066—Session management
    • H04L65/1101—Session protocols
    • H04L65/1104—Session initiation protocol [SIP]
    • 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
    • H04W36/0011—Control or signalling for completing the hand-off for data sessions of end-to-end connection
    • H04W36/0022—Control or signalling for completing the hand-off for data sessions of end-to-end connection for transferring data sessions between adjacent core network technologies
    • H04W36/00224—Control or signalling for completing the hand-off for data sessions of end-to-end connection for transferring data sessions between adjacent core network technologies between packet switched [PS] and circuit switched [CS] network technologies, e.g. circuit switched fallback [CSFB]
    • H04W36/00226—Control or signalling for completing the hand-off for data sessions of end-to-end connection for transferring data sessions between adjacent core network technologies between packet switched [PS] and circuit switched [CS] network technologies, e.g. circuit switched fallback [CSFB] wherein the core network technologies comprise IP multimedia system [IMS], e.g. single radio voice call continuity [SRVCC]
    • 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

Definitions

  • the present disclosure relates generally to communication systems, and more particularly, to method and apparatus for managing handover between different radio access technologies (RAT) , particularly between 4G Long Term Evolution (LTE) cells and 5G New Radio (NR) cells while voice over internet protocol (IP) (VoIP) call.
  • RAT radio access technologies
  • LTE Long Term Evolution
  • NR 5G New Radio
  • IP internet protocol
  • 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
  • Some aspects of 5G NR may be based on the 4G Long Term Evolution (LTE) standard.
  • LTE Long Term Evolution
  • a method, a computer-readable medium, and an apparatus may be user equipment (UE) and LTE cells that may block a handover from the LTE cell to a 5G NR Cell while an internet protocol (IP) multimedia subsystem (IMS) call service is provided via the LTE cell.
  • the LTE cell may transmit an instruction to modify a radio resource control (RRC) connection, and the instruction to modify the RRC connection may include a measurement control to trigger a handover to a 5G New Radio (NR) cell if the UE measures that a reference signal of the 5G NR cell is above a threshold value.
  • RRC radio resource control
  • handing over UE to the 5G NR cell may terminate the IMS call service when the 5G NR cell does not support the IMS call service.
  • the UE may block the handover process to the 5G NR cell by blocking a transmission of a measurement report of neighboring cells to the LTE cell or filtering out the measurements of neighboring 5G NR cells in the measurement report of the neighboring cells.
  • the LTE cell may block the initiation of the handover process to the 5G NR cell by excluding a measurement control to trigger a handover to the 5G NR cell in an instruction to modify the RRC connection, or ignoring the handover to the 5G NR cell indicated in the measurement report received from the UE.
  • 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.
  • FIG. 2A is a diagram illustrating an example of a first frame, in accordance with various aspects of the present disclosure.
  • FIG. 2B is a diagram illustrating an example of DL channels within a subframe, in accordance with various aspects of the present disclosure.
  • FIG. 2C is a diagram illustrating an example of a second frame, in accordance with various aspects of the present disclosure.
  • FIG. 2D is a diagram illustrating an example of UL channels within a subframe, in accordance with various aspects of the present disclosure.
  • 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 call flow diagram of a method of wireless communication.
  • 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 diagram illustrating an example of a hardware implementation for an example apparatus.
  • FIG. 8 is a diagram illustrating an example of a hardware implementation for an example apparatus.
  • 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 throughout 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 first backhaul links 132, the second backhaul links 184, and 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) .
  • 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, WiMedia, Bluetooth, ZigBe
  • 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, e.g., in a 5 GHz unlicensed frequency spectrum or the like.
  • AP Wi-Fi access point
  • STAs Wi-Fi stations
  • communication links 154 e.g., in a 5 GHz unlicensed frequency spectrum or the like.
  • 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 unlicensed frequency spectrum (e.g., 5 GHz, or the like) 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.
  • the small cell 102' employing NR in an unlicensed frequency spectrum, may boost coverage to and/or increase capacity of the access network.
  • the electromagnetic spectrum is often subdivided, based on frequency/wavelength, into various classes, bands, channels, etc.
  • two initial operating bands have been identified as frequency range designations FR1 (410 MHz –7.125 GHz) and FR2 (24.25 GHz –52.6 GHz) .
  • the frequencies between FR1 and FR2 are often referred to as mid-band frequencies.
  • FR1 is often referred to (interchangeably) as a “sub-6 GHz” band in various documents and articles.
  • FR2 which is often referred to (interchangeably) as a “millimeter wave” band in documents and articles, despite being different from the extremely high frequency (EHF) band (30 GHz –300 GHz) which is identified by the International Telecommunications Union (ITU) as a “millimeter wave” band.
  • EHF extremely high frequency
  • ITU International Telecommunications Union
  • sub-6 GHz or the like if used herein may broadly represent frequencies that may be less than 6 GHz, may be within FR1, or may include mid-band frequencies.
  • millimeter wave or the like if used herein may broadly represent frequencies that may include mid-band frequencies, may be within FR2, or may be within the EHF band.
  • 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 frequencies, and/or near millimeter wave frequencies in communication with the UE 104.
  • the gNB 180 may be referred to as a millimeter wave base station.
  • the millimeter wave base station 180 may utilize beamforming 182 with the UE 104 to compensate for the 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 quality of service (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 Packet Switch (PS) Streaming (PSS) Service, and/or other IP services.
  • IMS IP Multimedia Subsystem
  • PS Packet Switch
  • 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.
  • the UE 104 and/or the base station 180 may be configured to manage cell handover between different RATs, particularly, between LTE cells and 5G NR cells while the UE is on a VoIP call (198) .
  • LTE cells and 5G NR cells the concepts described herein may be applicable to other similar areas, such as LTE-A, CDMA, GSM, and other wireless technologies.
  • 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 frequency division duplexed (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 time division duplexed (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.
  • FDD frequency division duplexed
  • TDD time division duplexed
  • 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 F is flexible for use between DL/UL, and subframe 3 being configured with slot format 34 (with mostly UL) . While subframes 3, 4 are shown with slot formats 34, 28, respectively, any particular subframe may be configured with any of the various available slot formats 0-61. 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 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 4 allow for 1, 2, 4, 8, and 16 slots, respectively, per subframe. For slot configuration 1, different numerologies 0 to 2 allow for 2, 4, and 8 slots, respectively, per subframe. Accordingly, for slot configuration 0 and numerology ⁇ , there are 14 symbols/slot and 2 ⁇ slots/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 4.
  • 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.
  • Each BWP may have a particular numerology.
  • 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 R x 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 PDCCH within one BWP may be referred to as a control resource set (CORESET) . Additional BWPs may be located at greater and/or lower frequencies across the channel bandwidth.
  • 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 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. Based on the physical layer identity and the physical layer cell identity group number, 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 (also referred to as SS block (SSB) ) .
  • MIB master information 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 hybrid automatic repeat request (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 198 of FIG. 1.
  • At least one of the TX processor 316, the RX processor 370, and the controller/processor 375 may be configured to perform aspects in connection with 198 of FIG. 1.
  • EPS evolved packet system
  • TAU LTE tracking area update
  • the LTE cells redirect the UE back to NR cell due to measurement report during an LTE tracking area update (TAU) procedure. That is, according to the mobile network with the LTE RAT and the 5G NR RAT configuration, initiating an IMS call on the UE registered to the 5G NR cell may initiate the handover to the LTE cell since the 5G NR cell does not support the VoIP call.
  • the UE may transmit a request for tracking area update, and the LTE cell may send a RRC connection reconfiguration instruction with a measurement control to the UE.
  • the UE may prepare and transmit a measurement report, which may indicate the LTE cell to initiate a handover to the 5G NR cell.
  • VoIP call fail since NR cell may not support a voice over NR (VoNR) at current stage.
  • VoIP voice over NR
  • PSHO packet switched handover
  • a handover back to the SA NR cell based on the UE indication in the measurement report to handover to the NR cell would cause the VoIP call failure since the SA NR cell may not have the VoNR capabilities.
  • FIG. 4 is a call flow diagram 400 of a method of wireless communication.
  • redirecting the UE 402 to 5G NR cell 404 is not reasonable when LTE cell 406 is in critical voice call setup procedure. That is, not all 5G NR core network support the VoNR functions, redirecting the UE 402, that is provided with VoIP call via LTE cell 406, to the 5G NR cell 404 is not reasonable because the UE 402 may lose the critical VoIP call service that was provided via the LTE cell 406.
  • the first aspects of disclosure which provides that when UE 402 handover to LTE and doing TAU, let UE 402 block report B1 event until the call ends.
  • a dedicate bearer could be only assigned in LTE network, and the 5G NR network could not modify PDU session to add QoS flow for the PDU session.
  • the voice /video real-time transport protocol (RTP) packet could be sent through LTE network.
  • the UE 402 is connected and registered to a 5G NR cell 404, which is a SA 5G NR cell 404, and also registered to the IMS service via the 5G NR cell 404.
  • the user of the UE 402 initiates an VoIP call via the UE 402.
  • the UE 402 transmits a request for VoIP call to the 5G NR cell 404, in response to the user of the UE 402 initiating the VoIP call.
  • the UE 402 may receive a mobile originated (MO) call, and initiate a VoIP call.
  • the UE 402 may follow certain session initiation protocol (SIP) , and transmit an IMS_SIP_INVITE request to the 5G NR cell 404, indicating that the UE 402 is being invited to participate in a call session.
  • SIP session initiation protocol
  • the 5G NR cell 404 may instruct the UE 402 to initiate a handover to an LTE cell 406, since the 5G NR cell 404 does not support the VoIP call.
  • the 5G NR cell 404 may transmit a Mobility From NR Command message to the UE 402, initiating a handover procedure to move the UE 402 to a cell using other RAT, such as the LTE.
  • the Mobility From NR Command message may include the radio resources that have been allocated for the UE 402 in the target LTE cell 406, based on previous measurement reports.
  • the UE 402 and the LTE cell 406 may reconfigure the RRC connection and complete the handover process.
  • the LTE cell 406 may transmit an RRC Connection Reconfiguration message to the UE 402 to handover the UE 402 to the LTE cell 406 by modifying the RRC connection.
  • the UE 402 may transmit an RRC Connection Reconfiguration complete message to the LTE cell 406, indicating that the handover is completed.
  • the UE 402 may transmit a TAU request to update the tracking area.
  • the LTE cell 406 may transmit an RRC Connection Reconfiguration message including a measurement control.
  • the measurement control may indicate and/or configure a set of handover events to other RAT.
  • the set of handover events may include an A1 event, an A2 event, and a B1 event.
  • the A1 event may be triggered when the serving cell becomes better than a threshold.
  • the UE may stop measuring for the other RAT.
  • the A2 event may be triggered when the serving cell becomes worse than a threshold.
  • the UE may start measuring for the other RAT.
  • the B1 event may be triggered when a neighboring cell becomes better than a threshold. Then the B1 event is triggered, the UE may initiate the inter-RAT handover to the other RAT.
  • the UE 402 may determine whether the IMS call is provided via the LTE cell 406. If the UE 402 determines that the IMS call is provided via the LTE cell 406, the UE 402 may determine to block an initiation of a handover process from the LTE cell 406 to 5G NR cell 404 at 423.
  • the UE 402 may block transmitting a B1 event to the LTE cell 406, which may initiate the LTE cell 406 to handover UE 402 to the 5G NR cell 404, based on determining that the IMS call is provided via the LTE cell 406. For example, the UE 402 may block transmitting the B1 event to the LTE cell 406 by two different approaches. First, the UE 402 may simply block transmitting the measurement report with the B1 event. That is, the UE 402 may generate the measurement report and when the measurement report triggers the B1 event, the UE 402 may determine not to transmit the measurement report with the B1 event.
  • the UE 402 may generate a measurement report with reference signals received from neighboring 5G NR cells filtered out. That is, UE 402 may filter out the measurements of the reference signals received from the neighboring 5G NR cells, and the measurement report would not trigger a B1 event.
  • the UE 402 may transmit a measurement report without the B1 event to the LTE cell 406. Accordingly, the LTE cell 406 may receive the measurement report without the B1 event from the UE 402, and therefore, the LTE cell 406 may not instruct the UE 402 to handover to the 5G NR cell 404.
  • the UE 402 and the LTE cell 406 may complete the TAU and successfully setup the VoIP call. Accordingly the UE 402 may be able to successfully set up the VoIP call with the LTE cell 406 without handing over UE 402 to the 5G NR cell 404.
  • the LTE cell 406 shall not trigger sending a measurement control with B1 event for NR cell 404 to UE 402 when found there is an ongoing IMS call for the UE 402.
  • the LTE cell 406 may configure measurement control with B1 event for 5G NR cell 404 during the IMS call procedure, by receiving the measurement report containing the 5G NR cell 404 from the UE 402, the LTE cell 406 may ignore the B1 event and not trigger the inter-RAT handover to 5G NR cell 404 if there is an ongoing IMS call.
  • the LTE cell 406 may also take certain steps to block the handover process of the UE 402 to the 5G NR cell 404.
  • the LTE cell 406 may determine whether the IMS call is provided via the LTE cell 406 to the UE 402.
  • the LTE cell 406 may receive IMS call information from the corresponding IMS core network.
  • the LTE cell 406 may, at 420, transmit the measurement control without the B1 event. Accordingly, the UE 402 may generate measurement report without the B1 event, and therefore, the UE 402 may transmit the measurement report without the B1 event (426) .
  • the LTE cell 406 may, at 420, transmit the measurement control with the B1 event, and when, at 432, the UE 402 transmits a measurement report with the B1 event to the LTE cell 406, the LTE cell 406 may determine, at 434, to ignore the B1 event in the measurement report received from the UE 402. Accordingly, the UE 402 and the LTE cell 406 may complete the TAU and successfully setup the VoIP call at 428. Accordingly, the UE 402 may be able to successfully set up the VoIP call with the LTE cell 406 without handing over UE 402 to the 5G NR cell 404.
  • the UE may have a good NR cell coverage area and a little weaker LTE cell coverage area from a neighboring compared to the NR cell.
  • the UE may successfully setup the voice call over LTE despite the better cell coverage area of the NR cell.
  • the OTA messages captured from the UE may also show that 1) the measurement control is not received from the LTE cell, 2) the measurement report does not include the B1 event, or 3) the LTE cell ignores the measurement control with B1 received from the UE.
  • FIG. 5 is a flowchart 500 of a method of wireless communication.
  • the method may be performed by a UE (e.g., the UE 104; the apparatus 702) .
  • the UE may receive, from LTE cell, an RRC connection reconfiguration instruction including measurement control to trigger a handover (420) .
  • 502 may be performed by a RRC and handover component 742.
  • the UE may determine whether an IMS call service is provided via the LTE cell. For example, 504 may be performed by an IMS component 740.
  • the UE may generate and transmit a measurement report of reference signals received from neighboring cells including 5G NR cells. For example, 506 may be performed by an RS measurement component 744.
  • the UE may block an initiation of the handover process from the LTE cell to the 5G NR cell (423) .
  • 508 may be performed by the RRC and handover component 742.
  • the UE may block transmission of the measurement report of neighboring cells’ reference signals that triggers B1 event to the LTE cell (424) .
  • 510 may be performed by the RS measurement component 744.
  • the UE may generate a measurement report with reference signals received from neighboring 5G NR cells filtered out (425) .
  • 510 may be performed by the RS measurement component 744.
  • the UE may transmit measurement report without B1 event to the LTE cell (426) .
  • 512 may be performed by the RS measurement component 744.
  • the UE may successfully setup the VoIP call with the LTE cell (428) .
  • 516 may be performed by the RS measurement component 744.
  • FIG. 6 is a flowchart 600 of a method of wireless communication.
  • the method may be performed by a base station (e.g., the base station 102/180; the apparatus 802.
  • the base station may transmit, to the UE, the RRC connection reconfiguration instruction including measurement control to trigger a handover (420) .
  • 602 may be performed by an RRC and handover component 842.
  • the base station may receive, from the UE, the measurement report from the UE indicating a handover to a 5G NR cell (432) .
  • 604 may be performed by the RRC and handover component 842.
  • the base station may determine whether the IMS call service is provided via the LTE cell (430) .
  • 606 may be performed by an IMS component 840.
  • the base station may ignore the handover to the 5G NR cell indicated in the measurement report received from the UE (434) .
  • 608 may be performed by the RRC and handover component 842.
  • the base station may successfully setup the VoIP call with the UE (428) .
  • 609 may be performed by the IMS component 840.
  • the base station may initiate the handover to the 5G NR cell as indicated in the measurement report received from the UE.
  • 610 may be performed by the RRC and handover component 842.
  • the base station may determine whether the IMS call service is provided via the LTE cell (430) .
  • 612 may be performed by the IMS component 840.
  • the base station may transmit, to the UE, the RRC connection reconfiguration instruction without a measurement control to trigger a handover (420) .
  • 614 may be performed by the RRC and handover component 842.
  • the base station may receive, from the UE, the measurement report from the UE without the handover to the 5G NR cell (426) .
  • 616 may be performed by the RRC and handover component 842.
  • FIG. 7 is a diagram 700 illustrating an example of a hardware implementation for an apparatus 702.
  • the apparatus 702 is a UE and includes a cellular baseband processor 704 (also referred to as a modem) coupled to a cellular RF transceiver 722 and one or more subscriber identity modules (SIM) cards 720, an application processor 706 coupled to a secure digital (SD) card 708 and a screen 710, a Bluetooth module 712, a wireless local area network (WLAN) module 714, a Global Positioning System (GPS) module 716, and a power supply 718.
  • the cellular baseband processor 704 communicates through the cellular RF transceiver 722 with the UE 104 and/or BS 102/180.
  • the cellular baseband processor 704 may include a computer-readable medium /memory.
  • the computer-readable medium /memory may be non-transitory.
  • the cellular baseband processor 704 is responsible for general processing, including the execution of software stored on the computer-readable medium /memory.
  • the software when executed by the cellular baseband processor 704, causes the cellular baseband processor 704 to perform the various functions described supra.
  • the computer-readable medium /memory may also be used for storing data that is manipulated by the cellular baseband processor 704 when executing software.
  • the cellular baseband processor 704 further includes a reception component 730, a communication manager 732, and a transmission component 734.
  • the communication manager 732 includes the one or more illustrated components.
  • the components within the communication manager 732 may be stored in the computer-readable medium /memory and/or configured as hardware within the cellular baseband processor 704.
  • the cellular baseband processor 704 may be a component of the UE 350 and may include the memory 360 and/or at least one of the TX processor 368, the RX processor 356, and the controller/processor 359.
  • the apparatus 702 may be a modem chip and include just the baseband processor 704, and in another configuration, the apparatus 702 may be the entire UE (e.g., see 350 of FIG. 3) and include the aforediscussed additional modules of the apparatus 702.
  • the communication manager 732 includes an IMS component 740 that is configured to determine whether an IMS call service is provided via the LTE cell and successfully setup the VoIP call with the LTE cell, e.g., as described in connection with 504 and 516.
  • the communication manager 732 further includes an RRC and handover component 742 that is configured to receive, from LTE cell, RRC connection reconfiguration instruction including measurement control to trigger a handover and block an initiation of the handover process from the LTE cell to the 5G NR cell, e.g., as described in connection with 502 and 508.
  • the communication manager 732 further includes an RS measurement component 744 that is configured to generate and transmit a measurement report of reference signals received from neighboring cells including 5G NR cells, block transmission of the measurement report of neighboring cells’ reference signals that triggers B1 event to the LTE cell, and generate a measurement report with reference signals received from neighboring 5G NR cells filtered out and transmit the measurement report without B1 event to the LTE cell, e.g., as described in connection with 506, 510, 512, and 514.
  • RS measurement component 744 is configured to generate and transmit a measurement report of reference signals received from neighboring cells including 5G NR cells, block transmission of the measurement report of neighboring cells’ reference signals that triggers B1 event to the LTE cell, and generate a measurement report with reference signals received from neighboring 5G NR cells filtered out and transmit the measurement report without B1 event to the LTE cell, e.g., as described in connection with 506, 510, 512, and 514.
  • the apparatus may include additional components that perform each of the blocks of the algorithm in the aforementioned flowcharts of FIGs. 4 and 5. As such, each block in the aforementioned flowcharts of FIGs. 4 and 5 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.
  • the apparatus 702 includes means for receiving an instruction to modify an RRC connection from an LTE cell, the instruction including a measurement control to trigger a handover to a 5G NR cell, means for determining whether an IMS call service is provided via the LTE cell, and means for blocking an initiation of a handover process from the LTE cell to the 5G NR cell based on the determination that the IMS call is provided via the LTE cell.
  • the aforementioned means may be one or more of the aforementioned components of the apparatus 702 configured to perform the functions recited by the aforementioned means.
  • the apparatus 702 may include the TX Processor 368, the RX Processor 356, and the controller/processor 359.
  • the aforementioned means may be the TX Processor 368, the RX Processor 356, and the controller/processor 359 configured to perform the functions recited by the aforementioned means.
  • FIG. 8 is a diagram 800 illustrating an example of a hardware implementation for an apparatus 802.
  • the apparatus 802 is a BS and includes a baseband unit 804.
  • the baseband unit 804 may communicate through a cellular RF transceiver with the UE 104.
  • the baseband unit 804 may include a computer-readable medium /memory.
  • the baseband unit 804 is responsible for general processing, including the execution of software stored on the computer-readable medium /memory.
  • the software when executed by the baseband unit 804, causes the baseband unit 804 to perform the various functions described supra.
  • the computer-readable medium /memory may also be used for storing data that is manipulated by the baseband unit 804 when executing software.
  • the baseband unit 804 further includes a reception component 830, a communication manager 832, and a transmission component 834.
  • the communication manager 832 includes the one or more illustrated components.
  • the components within the communication manager 832 may be stored in the computer-readable medium /memory and/or configured as hardware within the baseband unit 804.
  • the baseband unit 804 may be a component of the BS 310 and may include the memory 376 and/or at least one of the TX processor 316, the RX processor 370, and the controller/processor 375.
  • the communication manager 832 includes an IMS component 840 that is configured to determine whether the IMS call service is provided via the LTE cell and setup the VoIP call with the UE, e.g., as described in connection with 606, 609, and 612.
  • the communication manager 832 further includes an RRC and handover component 842 that is configured to transmit, to the UE, the RRC connection reconfiguration instruction with or without the measurement control to trigger a handover, receive, from the UE, the measurement report from the UE with or without a handover to the 5G NR cell, ignore the handover to the 5G NR cell indicated in the measurement report received from the UE, and initiate the handover to the 5G NR cell as indicated in the measurement report received from the UE, e.g., as described in connection with 602, 604, 608, 610, 612, 614, and 616.
  • the apparatus may include additional components that perform each of the blocks of the algorithm in the aforementioned flowcharts of FIGs. 4 and 6. As such, each block in the aforementioned flowcharts of FIGs. 4 and 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.
  • the apparatus 802 includes means for determining whether an IMS call service is provided to a UE via the LTE cell, means for blocking an initiation of a handover process from the LTE cell to a 5G NR cell based on the determination that the IMS call is provided to the UE via the LTE cell, and means for transmitting an instruction to modify an RRC connection from the LTE cell, the instruction including a measurement control to trigger a handover to the 5G NR cell based on the determination that the IMS call is not provided to the UE via the LTE cell.
  • the aforementioned means may be one or more of the aforementioned components of the apparatus 802 configured to perform the functions recited by the aforementioned means.
  • the apparatus 802 may include the TX Processor 316, the RX Processor 370, and the controller/processor 375.
  • the aforementioned means may be the TX Processor 316, the RX Processor 370, and the controller/processor 375 configured to perform the functions recited by the aforementioned means.
  • UE user equipment
  • LTE cells that may block a handover from the LTE cell to a 5G NR Cell while an internet protocol (IP) multimedia subsystem (IMS) call service is provided via the LTE cell.
  • IP internet protocol
  • IMS internet protocol multimedia subsystem
  • the LTE cell may transmit an instruction to modify a radio resource control (RRC) connection, and the instruction to modify the RRC connection may include a measurement control to trigger a handover to a 5G New Radio (NR) cell if the UE measures that a reference signal of the 5G NR cell is above a threshold value.
  • RRC radio resource control
  • handing over UE to the 5G NR cell may terminate the IMS call service when the 5G NR cell does not support the IMS call service.
  • the UE may block the handover process to the 5G NR cell by blocking a transmission of a measurement report of neighboring cells to the LTE cell or filtering out the measurements of neighboring 5G NR cells in the measurement report of the neighboring cells.
  • the LTE cell may block the initiation of the handover process to the 5G NR cell by excluding a measurement control to trigger a handover to the 5G NR cell in an instruction to modify the RRC connection, or ignoring the handover to the 5G NR cell indicated in the measurement report received from the UE.
  • the UE may have a good NR cell coverage area and a little weaker LTE cell coverage area compared to the neighboring NR cell.
  • the UE registered to the 5G NR SA network may make a voice call, and the UE may be handed over to the LTE cell and successfully setup the voice call over LTE cell despite the better cell coverage area of the NR cell.
  • the over the air (OTA) messages captured from the UE may also show that 1) the measurement control is not received from the LTE cell, 2) the measurement report does not include the B1 event, or 3) the LTE cell ignores the measurement control with B1 received from the UE.
  • OTA over the air
  • 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.
  • LTE network shall not trigger send measurement control with B1 event for NR to UE when found there is an ongoing IMS call for this UE.
  • LTE network configure measurement control with B1 event for NR during IMS call procedure, by receiving measurement report contains NR rat from UE, it shall ignore the B1 event and not trigger inter-RAT handover to NR if there is an ongoing IMS call
  • the UE may have a good NR cell coverage area and a little weaker LTE cell coverage area compared to the neighboring NR cell.
  • the UE may successfully setup the voice call over LTE despite the better cell coverage area of the NR cell.
  • the OTA messages captured from the UE may also show that 1) the measurement control is not received from the LTE cell, 2) the measurement report does not include the B1 event, or 3) the LTE cell ignores the measurement control with B1 received from the UE.

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Abstract

La présente invention concerne un appareil de communication sans fil qui comprend des UE et des cellules LTE qui peuvent bloquer un transfert intercellulaire de la cellule LTE vers une cellule NR 5G pendant la fourniture d'un service d'appel IMS par l'intermédiaire de la cellule LTE. L'UE peut bloquer le processus de transfert intercellulaire vers la cellule NR 5G en bloquant une transmission d'un rapport de mesure de cellules voisines vers la cellule LTE ou en filtrant les mesures de cellules NR 5G voisines dans le rapport de mesure des cellules voisines. La cellule LTE peut bloquer l'initiation du processus de transfert intercellulaire vers la cellule NR 5G en excluant une commande de mesure pour déclencher un transfert intercellulaire vers la cellule NR 5G dans une instruction pour modifier la connexion RRC ou en ignorant le transfert intercellulaire vers la cellule NR 5G indiqué dans le rapport de mesure reçu en provenance de l'UE.
PCT/CN2020/100139 2020-07-03 2020-07-03 Procédé et appareil pour gérer un transfert intercellulaire entre technologies d'accès radio WO2022000470A1 (fr)

Priority Applications (1)

Application Number Priority Date Filing Date Title
PCT/CN2020/100139 WO2022000470A1 (fr) 2020-07-03 2020-07-03 Procédé et appareil pour gérer un transfert intercellulaire entre technologies d'accès radio

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CN107529199A (zh) * 2017-10-24 2017-12-29 广东工业大学 Ims注册及语音业务提供方法、***、设备及存储介质
WO2018146056A1 (fr) * 2017-02-07 2018-08-16 Telefonaktiebolaget Lm Ericsson (Publ) Traduction de support
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WO2020036366A1 (fr) * 2018-08-13 2020-02-20 Samsung Electronics Co., Ltd. Procédé et appareil de prise en charge d'une tranche de réseau lorsqu'un équipement utilisateur se déplace entre des réseaux 4g et 5g
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WO2018231813A1 (fr) * 2017-06-13 2018-12-20 Intel IP Corporation Systèmes, procédés et dispositifs de reprise d'un système existant dans un système de communication sans fil
CN107529199A (zh) * 2017-10-24 2017-12-29 广东工业大学 Ims注册及语音业务提供方法、***、设备及存储介质
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