WO2021243551A1 - Techniques de transfert intercellulaire ou de redirection d'équipement d'utilisateur de 4g à 5g (sa) - Google Patents

Techniques de transfert intercellulaire ou de redirection d'équipement d'utilisateur de 4g à 5g (sa) Download PDF

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Publication number
WO2021243551A1
WO2021243551A1 PCT/CN2020/093893 CN2020093893W WO2021243551A1 WO 2021243551 A1 WO2021243551 A1 WO 2021243551A1 CN 2020093893 W CN2020093893 W CN 2020093893W WO 2021243551 A1 WO2021243551 A1 WO 2021243551A1
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WIPO (PCT)
Prior art keywords
base station
threshold
network
wireless communication
rsrp
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PCT/CN2020/093893
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English (en)
Inventor
Ying Wang
Ye Liu
Wulin WANG
Chaofeng HUI
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Qualcomm Incorporated
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Priority to PCT/CN2020/093893 priority Critical patent/WO2021243551A1/fr
Publication of WO2021243551A1 publication Critical patent/WO2021243551A1/fr

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    • 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
    • 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
    • H04W36/00222—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 different packet switched [PS] network technologies, e.g. transferring data sessions between LTE and WLAN or LTE and 5G

Definitions

  • aspects of the present disclosure relate generally to wireless communication systems, and more particularly, to techniques for handover and redirection of a UE from 4G network service to 5G (SA) network service.
  • SA 5G
  • Certain aspects of the technology discussed below can enable and provide enhanced communication features and techniques for communication systems, including high performance, high reliability, low latency, low complexity, power-efficient device operations, and aiding devices to discover, select, recover, handover, and use network service.
  • Wireless communication networks are widely deployed to provide various communication services such as voice, video, packet data, messaging, broadcast, and the like. These wireless networks may be multiple-access networks capable of supporting multiple users by sharing the available network resources. Such networks, which are usually multiple access networks, support communications for multiple users by sharing the available network resources.
  • a wireless communication network may include a number of base stations or node Bs that can support communication for a number of user equipments (UEs) .
  • a UE may communicate with a base station via downlink and uplink.
  • the downlink (or forward link) refers to the communication link from the base station to the UE
  • the uplink (or reverse link) refers to the communication link from the UE to the base station.
  • a base station may transmit data and control information on the downlink to a UE and/or may receive data and control information on the uplink from the UE.
  • a transmission from the base station may encounter interference due to transmissions from neighbor base stations or from other wireless radio frequency (RF) transmitters.
  • RF radio frequency
  • a transmission from the UE may encounter interference from uplink transmissions of other UEs communicating with the neighbor base stations or from other wireless RF transmitters. This interference may degrade performance on both the downlink and uplink.
  • a method of wireless communication can include determining, by a UE, that a reference signal reference power (RSRP) associated with a second base station is less than a first threshold while the UE is registered in a first wireless communication network associated with a first base station.
  • the method can also include triggering, by the UE, a registration procedure to register the UE in a second wireless communication network associated with the second base station upon determining that the RSRP associated with the second base station is greater than a second threshold.
  • RSRP reference signal reference power
  • an apparatus configured for wireless communication.
  • the apparatus can include means for determining that a RSRP associated with a second base station is less than a first threshold while a UE is registered in a first wireless communication network associated with a first base station.
  • the apparatus can also include means for triggering a registration procedure to register the UE in a second wireless communication network associated with the second base station upon determining that the RSRP associated with the second base station is greater than a second threshold.
  • a non-transitory computer-readable medium having program code recorded thereon is provided.
  • the program code can include program code executable by a computer for causing the computer to determine that a RSRP associated with a second base station is less than a first threshold while a UE is registered in a first wireless communication network associated with a first base station.
  • the program code can also include program code executable by the computer for causing the computer to trigger a registration procedure to register the UE in a second wireless communication network associated with the second base station upon determining that the RSRP associated with the second base station is greater than a second threshold.
  • an apparatus configured for wireless communication.
  • the apparatus includes at least one processor, and a memory coupled to the processor.
  • the at least one processor can be configured to determine that a RSRP associated with a second base station is less than a first threshold while a UE is registered in a first wireless communication network associated with a first base station.
  • the at least one processor can also be configured to trigger a registration procedure to register the UE in a second wireless communication network associated with the second base station upon determining that the RSRP associated with the second base station is greater than a second threshold.
  • FIG. 1 is a block diagram illustrating details of a wireless communication system according to some aspects of the present disclosure.
  • FIG. 2 is a block diagram conceptually illustrating a design of a base station and a UE configured according to some aspects of the present disclosure.
  • FIG. 3 is a block diagram illustrating a method for handover and redirection of a UE from non-5G (SA) network service to 5G (SA) network service according to some aspects of the present disclosure.
  • FIG. 4 is a diagram illustrating operations performed by a UE as part of a handover and redirection procedure from non-5G (SA) network service, e.g., 4G/LTE network service, to 5G(SA) network service according to some aspects of the present disclosure.
  • SA non-5G
  • SA 4G/LTE network service
  • FIG. 5 is a block diagram conceptually illustrating a design of a UE configured according to some aspects of the present disclosure.
  • This disclosure relates generally to providing or participating in communication as between two or more wireless devices in one or more wireless communications systems, also referred to as wireless communications networks.
  • the techniques and apparatus may be used for wireless communication networks such as code division multiple access (CDMA) networks, time division multiple access (TDMA) networks, frequency division multiple access (FDMA) networks, orthogonal FDMA (OFDMA) networks, single-carrier FDMA (SC-FDMA) networks, LTE networks, GSM networks, 5 th Generation (5G) or new radio (NR) networks (sometimes referred to as “5G NR” networks/systems/devices) , as well as other communications networks.
  • CDMA code division multiple access
  • TDMA time division multiple access
  • FDMA frequency division multiple access
  • OFDMA orthogonal FDMA
  • SC-FDMA single-carrier FDMA
  • LTE long-term evolution
  • GSM Global System for Mobile communications
  • 5G 5 th Generation
  • NR new radio
  • a CDMA network may implement a radio technology such as universal terrestrial radio access (UTRA) , cdma2000, and the like.
  • UTRA includes wideband-CDMA (W-CDMA) and low chip rate (LCR) .
  • CDMA2000 covers IS-2000, IS-95, and IS-856 standards.
  • a TDMA network may, for example implement a radio technology such as GSM.
  • 3GPP defines standards for the GSM EDGE (enhanced data rates for GSM evolution) radio access network (RAN) , also denoted as GERAN.
  • GERAN is the radio component of GSM/EDGE, together with the network that joins the base stations (for example, the Ater and Abis interfaces) and the base station controllers (A interfaces, etc. ) .
  • the radio access network represents a component of a GSM network, through which phone calls and packet data are routed from and to the public switched telephone network (PSTN) and Internet to and from subscriber handsets, also known as user terminals or user equipments (UEs) .
  • PSTN public switched telephone network
  • UEs subscriber handsets
  • a mobile phone operator's network may comprise one or more GERANs, which may be coupled with Universal Terrestrial Radio Access Networks (UTRANs) in the case of a UMTS/GSM network.
  • UTRANs Universal Terrestrial Radio Access Networks
  • An operator network may also include one or more LTE networks, and/or one or more other networks.
  • the various different network types may use different radio access technologies (RATs) and radio access networks (RANs) .
  • RATs radio access technologies
  • RANs radio access networks
  • An OFDMA network may implement a radio technology such as evolved UTRA (E-UTRA) , IEEE 802.11, IEEE 802.16, IEEE 802.20, flash-OFDM and the like.
  • E-UTRA evolved UTRA
  • GSM Global System for Mobile Communications
  • LTE long term evolution
  • UTRA, E-UTRA, GSM, UMTS and LTE are described in documents provided from an organization named “3rd Generation Partnership Project” (3GPP)
  • cdma2000 is described in documents from an organization named “3rd Generation Partnership Project 2” (3GPP2) .
  • 3GPP 3rd Generation Partnership Project
  • 3GPP long term evolution LTE
  • UMTS universal mobile telecommunications system
  • the 3GPP may define specifications for the next generation of mobile networks, mobile systems, and mobile devices.
  • the present disclosure is concerned with the evolution of wireless technologies from LTE, 4G, 5G, NR, and beyond with shared access to wireless spectrum between networks using a collection of new and different radio access technologies or radio air interfaces.
  • 5G networks contemplate diverse deployments, diverse spectrum, and diverse services and devices that may be implemented using an OFDM-based unified, air interface. To achieve these goals, further enhancements to LTE and LTE-A are considered in addition to development of the new radio technology for 5G NR networks.
  • the 5G NR will be capable of scaling to provide coverage (1) to a massive Internet of things (IoTs) with an ultra-high density (e.g., ⁇ 1M nodes/km 2 ) , ultra-low complexity (e.g., ⁇ 10s ofbits/sec) , ultra-low energy (e.g., ⁇ 10+years of battery life) , and deep coverage with the capability to reach challenging locations; (2) including mission-critical control with strong security to safeguard sensitive personal, financial, or classified information, ultra-high reliability (e.g., ⁇ 99.9999%reliability) , ultra-low latency (e.g., ⁇ 1 ms) , and users with wide ranges of mobility or lack thereof; and (3) with enhanced mobile broadband including extreme high capacity (e.g., ⁇ 10 Tbps/km 2 ) , extreme data rates (e.g., multi-Gbps rate, 100+Mbps user experienced rates) , and deep awareness with advanced discovery and optimizations.
  • IoTs Internet of things
  • 5G NR devices, networks, and systems may be implemented to use optimized OFDM-based waveform features. These features may include scalable numerology and transmission time intervals (TTIs) ; a common, flexible framework to efficiently multiplex services and features with a dynamic, low-latency time division duplex (TDD) /frequency division duplex (FDD) design; and advanced wireless technologies, such as massive multiple input, multiple output (MIMO) , robust millimeter wave (mmWave) transmissions, advanced channel coding, and device-centric mobility.
  • TTIs transmission time intervals
  • TDD dynamic, low-latency time division duplex
  • FDD frequency division duplex
  • advanced wireless technologies such as massive multiple input, multiple output (MIMO) , robust millimeter wave (mmWave) transmissions, advanced channel coding, and device-centric mobility.
  • Scalability of the numerology in 5G NR with scaling of subcarrier spacing, may efficiently address operating diverse services across diverse spectrum and diverse deployments.
  • subcarrier spacing may occur with 15 kHz, for example over 1, 5, 10, 20 MHz, and the like bandwidth.
  • subcarrier spacing may occur with 30 kHz over 80/100 MHz bandwidth.
  • the subcarrier spacing may occur with 60 kHz over a 160 MHz bandwidth.
  • subcarrier spacing may occur with 120 kHz over a 500MHz bandwidth.
  • the scalable numerology of 5G NR facilitates scalable TTI for diverse latency and quality of service (QoS) requirements. For example, shorter TTI may be used for low latency and high reliability, while longer TTI may be used for higher spectral efficiency.
  • QoS quality of service
  • 5G NR also contemplates a self-contained integrated subframe design with uplink/downlink scheduling information, data, and acknowledgement in the same subframe.
  • the self-contained integrated subframe supports communications in unlicensed or contention-based shared spectrum, adaptive uplink/downlink that may be flexibly configured on a per-cell basis to dynamically switch between uplink and downlink to meet the current traffic needs.
  • LTE terminology may be used as illustrative examples in portions of the description below; however, the description is not intended to be limited to LTE applications.
  • the present disclosure is concerned with shared access to wireless spectrum between networks using different radio access technologies or radio air interfaces, such as those of5G NR.
  • wireless communication networks adapted according to the concepts herein may operate with any combination of licensed or unlicensed spectrum depending on loading and availability. Accordingly, it will be apparent to one of skill in the art that the systems, apparatus and methods described herein may be applied to other communications systems and applications than the particular examples provided.
  • Implementations may range from chip-level or modular components to non-modular, non-chip-level implementations and further to aggregated, distributed, or OEM devices or systems incorporating one or more described aspects.
  • devices incorporating described aspects and features may also necessarily include additional components and features for implementation and practice of claimed and described embodiments. It is intended that innovations described herein may be practiced in a wide variety of implementations, including both large/small devices, chip-level components, multi-component systems (e.g. RF-chain, communication interface, processor) , distributed arrangements, end-user devices, etc. of varying sizes, shapes, and constitution.
  • FIG. 1 shows wireless network 100 for communication according to some embodiments.
  • Wireless network 100 may, for example, comprise a 5G wireless network.
  • components appearing in FIG. 1 are likely to have related counterparts in other network arrangements including, for example, cellular-style network arrangements and non-cellular-style-network arrangements (e.g., device to device or peer to peer or ad hoc network arrangements, etc. ) .
  • Wireless network 100 illustrated in FIG. 1 includes a number of base stations 105 and other network entities.
  • a base station may be a station that communicates with the UEs and may also be referred to as an evolved node B (eNB) , a next generation eNB (gNB) , an access point, and the like.
  • eNB evolved node B
  • gNB next generation eNB
  • Each base station 105 may provide communication coverage for a particular geographic area.
  • the term “cell” can refer to this particular geographic coverage area of a base station and/or a base station subsystem serving the coverage area, depending on the context in which the term is used.
  • base stations 105 may be associated with a same operator or different operators (e.g., wireless network 100 may comprise a plurality of operator wireless networks) , and may provide wireless communications using one or more of the same frequencies (e.g., one or more frequency bands in licensed spectrum, unlicensed spectrum, or a combination thereof) as a neighboring cell.
  • an individual base station 105 or UE 115 may be operated by more than one network operating entity.
  • each base station 105 and UE 115 may be operated by a single network operating entity.
  • a base station may provide communication coverage for a macro cell or a small cell, such as a pico cell or a femto cell, and/or other types of cell.
  • a macro cell generally covers a relatively large geographic area (e.g., several kilometers in radius) and may allow unrestricted access by UEs with service subscriptions with the network provider.
  • a small cell such as a pico cell, would generally cover a relatively smaller geographic area and may allow unrestricted access by UEs with service subscriptions with the network provider.
  • a small cell such as a femto cell, would also generally cover a relatively small geographic area (e.g., a home) and, in addition to unrestricted access, may also provide restricted access by UEs having an association with the femto cell (e.g., UEs in a closed subscriber group (CSG) , UEs for users in the home, and the like) .
  • a base station for a macro cell may be referred to as a macro base station.
  • a base station for a small cell may be referred to as a small cell base station, a pico base station, a femto base station or a home base station. In the example shown in FIG.
  • base stations 105d and 105e are regular macro base stations, while base stations 105a-105c are macro base stations enabled with one of 3 dimension (3D) , full dimension (FD) , or massive MIMO. Base stations 105a-105c take advantage of their higher dimension MIMO capabilities to exploit 3D beamforming in both elevation and azimuth beamforming to increase coverage and capacity.
  • Base station 105f is a small cell base station which may be a home node or portable access point.
  • a base station may support one or multiple (e.g., two, three, four, and the like) cells.
  • Wireless network 100 may support synchronous or asynchronous operation.
  • the base stations may have similar frame timing, and transmissions from different base stations may be approximately aligned in time.
  • the base stations may have different frame timing, and transmissions from different base stations may not be aligned in time.
  • networks may be enabled or configured to handle dynamic switching between synchronous or asynchronous operations.
  • UEs 115 are dispersed throughout the wireless network 100, and each UE may be stationary or mobile.
  • a mobile apparatus is commonly referred to as user equipment (UE) in standards and specifications promulgated by the 3rd Generation Partnership Project (3GPP)
  • UE user equipment
  • 3GPP 3rd Generation Partnership Project
  • a mobile station MS
  • 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 (AT) , a mobile terminal, a wireless terminal, a remote terminal, a handset, a terminal, a user agent, a mobile client, a client, a gaming device, an augmented reality device, vehicular component device/module, or some other suitable terminology.
  • AT access terminal
  • a “mobile” apparatus or UE need not necessarily have a capability to move, and may be stationary.
  • Some non-limiting examples of a mobile apparatus such as may comprise embodiments of one or more of UEs 115, include a mobile, a cellular (cell) phone, a smart phone, a session initiation protocol (SIP) phone, a wireless local loop (WLL) station, a laptop, a personal computer (PC) , a notebook, a netbook, a smart book, a tablet, and a personal digital assistant (PDA) .
  • a mobile such as may comprise embodiments of one or more of UEs 115, include a mobile, a cellular (cell) phone, a smart phone, a session initiation protocol (SIP) phone, a wireless local loop (WLL) station, a laptop, a personal computer (PC) , a notebook, a netbook, a smart book, a tablet, and a personal digital assistant (PDA) .
  • PDA personal digital assistant
  • a mobile apparatus may additionally be an “Internet of things” (IoT) or “Internet of everything” (IoE) device such as an automotive or other transportation vehicle, a satellite radio, a global positioning system (GPS) device, a logistics controller, a drone, a multi-copter, a quad-copter, a smart energy or security device, a solar panel or solar array, municipal lighting, water, or other infrastructure; industrial automation and enterprise devices; consumer and wearable devices, such as eyewear, a wearable camera, a smart watch, a health or fitness tracker, a mammal implantable device, gesture tracking device, medical device, a digital audio player (e.g., MP3 player) , a camera, a game console, etc.
  • IoT Internet of things
  • IoE Internet of everything
  • a UE may be a device that includes a Universal Integrated Circuit Card (UICC) .
  • a UE may be a device that does not include a UICC.
  • UEs that do not include UICCs may also be referred to as IoE devices.
  • a UE may also be a machine specifically configured for connected communication, including machine type communication (MTC) , enhanced MTC (eMTC) , narrowband IoT (NB-IoT) and the like.
  • MTC machine type communication
  • eMTC enhanced MTC
  • NB-IoT narrowband IoT
  • UEs 115e-115k illustrated in FIG. 1 are examples of various machines configured for communication that access wireless network 100.
  • a mobile apparatus such as UEs 115, may be able to communicate with any type of the base stations, whether macro base stations, pico base stations, femto base stations, relays, and the like.
  • a lightning bolt e.g., communication link
  • UEs may operate as base stations or other network nodes in some scenarios.
  • Backhaul communication between base stations of wireless network 100 may occur using wired and/or wireless communication links.
  • base stations 105a-105c serve UEs 115a and 115b using 3D beamforming and coordinated spatial techniques, such as coordinated multipoint (CoMP) or multi-connectivity.
  • Macro base station 105d performs backhaul communications with base stations 105a-105c, as well as small cell, base station 105f.
  • Macro base station 105d also transmits multicast services which are subscribed to and received by UEs 115c and 115d.
  • Such multicast services may include mobile television or stream video, or may include other services for providing community information, such as weather emergencies or alerts, such as Amber alerts or gray alerts.
  • Wireless network 100 of embodiments supports mission critical communications with ultra-reliable and redundant links for mission critical devices, such UE 115e, which is a drone. Redundant communication links with UE 115e include from macro base stations 105d and 105e, as well as small cell base station 105f.
  • UE 115f thermometer
  • UE 115g smart meter
  • UE 115h wearable device
  • Wireless network 100 may also provide additional network efficiency through dynamic, low-latency TDD/FDD communications, such as in a vehicle-to-vehicle (V2V) mesh network between UEs 115i-115k communicating with macro base station 105e.
  • V2V vehicle-to-vehicle
  • FIG. 2 shows a block diagram of a design of a base station 105 and a UE 115, which may be any of the base stations and one of the UEs in FIG. 1.
  • base station 105 may be small cell base station 105f in FIG. 1
  • UE 115 may be UE 115c or 115D operating in a service area of base station 105f, which in order to access small cell base station 105f, would be included in a list of accessible UEs for small cell base station 105f.
  • Base station 105 may also be a base station of some other type. As shown in FIG. 2, base station 105 may be equipped with antennas 234a through 234t, and UE 115 may be equipped with antennas 252a through 252r for facilitating wireless communications.
  • transmit processor 220 may receive data from data source 212 and control information from controller/processor 240.
  • the control information may be for the physical broadcast channel (PBCH) , physical control format indicator channel (PCFICH) , physical hybrid-ARQ (automatic repeat request) indicator channel (PHICH) , physical downlink control channel (PDCCH) , enhanced physical downlink control channel (EPDCCH) , MTC physical downlink control channel (MPDCCH) , etc.
  • the data may be for the PDSCH, etc.
  • Transmit processor 220 may process (e.g., encode and symbol map) the data and control information to obtain data symbols and control symbols, respectively.
  • Transmit processor 220 may also generate reference symbols, e.g., for the primary synchronization signal (PSS) and secondary synchronization signal (SSS) , and cell-specific reference signal.
  • Transmit (TX) multiple-input multiple-output (MIMO) processor 230 may perform spatial processing (e.g., precoding) on the data symbols, the control symbols, and/or the reference symbols, if applicable, and may provide output symbol streams to modulators (MODs) 232a through 232t. Each modulator 232 may process a respective output symbol stream (e.g., for OFDM, etc. ) to obtain an output sample stream.
  • TX multiple-input multiple-output
  • MIMO multiple-input multiple-output
  • Each modulator 232 may process a respective output symbol stream (e.g., for OFDM, etc. ) to obtain an output sample stream.
  • Each modulator 232 may additionally or alternatively process (e.g., convert to analog, amplify, filter, and upconvert) the output sample stream to obtain a downlink signal.
  • Downlink signals from modulators 232a through 232t may be transmitted via antennas 234a through 234t, respectively.
  • the antennas 252a through 252r may receive the downlink signals from base station 105 and may provide received signals to demodulators (DEMODs) 254a through 254r, respectively.
  • Each demodulator 254 may condition (e.g., filter, amplify, downconvert, and digitize) a respective received signal to obtain input samples.
  • Each demodulator 254 may further process the input samples (e.g., for OFDM, etc. ) to obtain received symbols.
  • MIMO detector 256 may obtain received symbols from demodulators 254a through 254r, perform MIMO detection on the received symbols if applicable, and provide detected symbols.
  • Receive processor 258 may process (e.g., demodulate, deinterleave, and decode) the detected symbols, provide decoded data for UE 115 to data sink 260, and provide decoded control information to controller/processor 280.
  • transmit processor 264 may receive and process data (e.g., for the physical uplink shared channel (PUSCH) ) from data source 262 and control information (e.g., for the physical uplink control channel (PUCCH) ) from controller/processor 280. Transmit processor 264 may also generate reference symbols for a reference signal. The symbols from transmit processor 264 may be precoded by TX MIMO processor 266 if applicable, further processed by modulators 254a through 254r (e.g., for SC-FDM, etc. ) , and transmitted to base station 105.
  • data e.g., for the physical uplink shared channel (PUSCH)
  • control information e.g., for the physical uplink control channel (PUCCH)
  • controller/processor 280 e.g., for the physical uplink control channel (PUCCH)
  • Transmit processor 264 may also generate reference symbols for a reference signal.
  • the symbols from transmit processor 264 may be precoded by TX MIMO processor 266 if applicable,
  • the uplink signals from UE 115 may be received by antennas 234, processed by demodulators 232, detected by MIMO detector 236 if applicable, and further processed by receive processor 238 to obtain decoded data and control information sent by UE 115.
  • Processor 238 may provide the decoded data to data sink 239 and the decoded control information to controller/processor 240.
  • Controllers/processors 240 and 280 may direct the operation at base station 105 and UE 115, respectively. Controller/processor 240 and/or other processors and modules at base station 105 and/or controller/processor 280 and/or other processors and modules at UE 115 may perform or direct the execution of various processes for the techniques described herein, such as to perform or direct the execution illustrated in FIG. 3, and/or other processes for the techniques described herein. Memories 242 and 282 may store data and program codes for base station 105 and UE 115, respectively. Scheduler 244 may schedule UEs for data transmission on the downlink and/or uplink.
  • Wireless communications systems operated by different network operating entities may share spectrum.
  • a network operating entity may be configured to use an entirety of a designated shared spectrum for at least a period of time before another network operating entity uses the entirety of the designated shared spectrum for a different period of time.
  • certain resources e.g., time
  • a network operating entity may be allocated certain time resources reserved for exclusive communication by the network operating entity using the entirety of the shared spectrum.
  • the network operating entity may also be allocated other time resources where the entity is given priority over other network operating entities to communicate using the shared spectrum.
  • These time resources, prioritized for use by the network operating entity may be utilized by other network operating entities on an opportunistic basis if the prioritized network operating entity does not utilize the resources. Additional time resources may be allocated for any network operator to use on an opportunistic basis.
  • Access to the shared spectrum and the arbitration of time resources among different network operating entities may be centrally controlled by a separate entity, autonomously determined by a predefined arbitration scheme, or dynamically determined based on interactions between wireless nodes of the network operators.
  • UE 115 and base station 105 may operate in a shared radio frequency spectrum band, which may include licensed or unlicensed (e.g., contention-based) frequency spectrum.
  • UEs 115 or base stations 105 may traditionally perform a medium-sensing procedure to contend for access to the frequency spectrum.
  • UE 115 or base station 105 may perform a listen before talk (LBT) procedure such as a clear channel assessment (CCA) prior to communicating in order to determine whether the shared channel is available.
  • LBT listen before talk
  • CCA clear channel assessment
  • a CCA may include an energy detection procedure to determine whether there are any other active transmissions.
  • a device may infer that a change in a received signal strength indicator (RSSI) of a power meter indicates that a channel is occupied.
  • RSSI received signal strength indicator
  • a CCA also may include detection of specific sequences that indicate use of the channel.
  • another device may transmit a specific preamble prior to transmitting a data sequence.
  • an LBT procedure may include a wireless node adjusting its own backoff window based on the amount of energy detected on a channel and/or the acknowledge/negative-acknowledge (ACK/NACK) feedback for its own transmitted packets as a proxy for collisions.
  • ACK/NACK acknowledge/negative-acknowledge
  • a UE such as UE 115, may obtain wireless network service from various wireless communication networks using various types of radio access technology (RAT) .
  • RAT radio access technology
  • a network may be associated with one or more base stations that utilize the same RAT utilized by the associated network.
  • the wireless communication network may provide wireless network service to a UE through associated base stations.
  • 5G NR technology exhibits many improvements over legacy non-5G NR technology as well as over technology that is a mixture of5G NR technology and legacy non-5G NR technology.
  • a RAT that includes only 5G NR technology may be referred to as a RAT that operates in a standalone (SA) mode of 5G NR.
  • SA standalone
  • a RAT may be referred to as 5G (SA) .
  • a RAT that includes a mixture of 5G NR technology and non-5G NR technology, such as 4G or a particular type of LTE technology may be referred to as a RAT that operates in a non-standalone (NSA) mode of 5G NR.
  • NSA non-standalone
  • a 5G (NSA) network may be a network that includes a primary/anchor base station that utilizes 4G/LTE technology and also includes a secondary base station that utilizes 5G (SA) technology.
  • non-5G NR technology may refer to any technology that does not include 5G NR.
  • non-5G technology may include LTE (or a particular type of LTE, such as LTE Advanced (LTE-A) , LTE in unlicensed spectrum (LTE-U) , etc. ) , 4G, WCDMA, CDMA2000, GSM, TD-SCDMA, IS-95, to name only a few.
  • a UE may be configured to prefer 5G (SA) network service over 5G (NSA) network service or non-5G network service. For example, when 5G (SA) network service becomes available while a UE is receiving non-5G (SA) network service, the UE may attempt to get 5G (SA) network service to make use of the many advantages of 5G (SA) technology. In other words, even when a UE is currently receiving reliable 4G/LTE network service from a 4G/LTE network, the UE may still attempt to obtain 5G (SA) network service when the 5G (SA) network service becomes available from a 5G (SA) network.
  • the process of transitioning from one type of network service, such as 5G (NSA) network service or non-5G network service, to another type of network service, such as 5G (SA) may be referred to as a handover and/or redirection process.
  • Prior techniques for handover and redirection of a UE from non-5G (SA) network service, e.g., 5G (NSA) network service or 4G/LTE network service, to 5G (SA) network service yield unfavorable operations in some instances.
  • SA non-5G
  • NSA 5G
  • 4G/LTE network service 4G/LTE network service
  • prior techniques may not trigger a handover or redirection process, and instead may cause a UE to remain in a 4G/LTE network for a long period of time even after 5G (SA) network service becomes available.
  • prior techniques may not trigger a handover or redirection process when reliable 4G/LTE network service is received by the UE and/or when a signal power associated with the 5G (SA) network does not exceed some predetermined fixed threshold.
  • a UE may not quickly handover or redirect to a preferred 5G (SA) network and instead may remain in a 4G/LTE network for a longer-than-necessary amount of time. This often results in poor user experience with the UE.
  • SA 5G
  • FIG. 3 shows a block diagram illustrating a method for handover and/or redirection of a UE from non-5G (SA) network service to 5G (SA) network service according to some aspects of the present disclosure.
  • Aspects of method 300 may be implemented with various other aspects of this disclosure described with respect to FIGS. 1-2 and 4-5, such as a mobile device/UE.
  • controller/processor 280 of UE 115 may control UE 115 to perform method 300.
  • FIG. 5 is a block diagram conceptually illustrating a design of a UE configured according to some aspects of the present disclosure.
  • UE 115 may include various structures, hardware, and components, such as those illustrated for UE 115 of FIG. 2.
  • UE 115 includes controller/processor 280, which operates to execute logic or computer instructions stored in memory 282.
  • the controller/processor 280 can also control components of UE 115 that provide the features and functionality of UE 115.
  • UE 115 under control of controller/processor 280, transmits and receives signals via wireless radios 501a-r and antennas 252a-r.
  • Wireless radios 501a-r include various components and hardware, as illustrated in FIG. 2 for UE 115, including modulator/demodulators 254a-r, MIMO detector 256, receive processor 258, transmit processor 264, and TX MIMO processor 266.
  • the controller/processor 280 can be provided with digital signals obtained from sampling received analog wireless signals for purposes of controlling communication operations.
  • FIG. 3 illustrates a method 300 that may be performed by a wireless communication device, such as a UE 115.
  • Method 300 includes, at block 302, determining, by a UE, that a reference signal reference power (RSRP) associated with a second base station is less than a first threshold while the UE is registered in a first wireless communication network associated with a first base station.
  • RSRP reference signal reference power
  • method 300 includes triggering, by the UE, a registration procedure to register the UE in a second wireless communication network associated with the second base station upon determining that the RSRP associated with the second base station is greater than a second threshold.
  • the actions shown at blocks 302 and 304 of method 300 may be a subset of the overall operations performed by a UE to handover or redirect to a 5G (SA) network from a non-5G (SA) network.
  • SA 5G
  • SA non-5G
  • the relationship between the actions shown at blocks 302 and 304 of method 300 and other operations that are performed by a UE to handover or redirect to a 5G (SA) network from a non-5G (SA) network may become more evident from a discussion of the overall operations performed by a UE to handover or redirect to a 5G (SA) network from a non-5G (SA) network.
  • FIG. 4 is a diagram illustrating operations performed by a UE as part of a handover and/or redirection procedure from non-5G (SA) network service, e.g., 4G/LTE network service, to 5G(SA) network service according to some aspects of the present disclosure.
  • FIG. 4 shows a UE 402, a 4G/LTE base station 404, and a 5G (SA) base station 406.
  • a 5G (SA) base station 406 may refer to a base station that utilizes 5G (SA) RAT and that is part of a 5G (SA) network.
  • a 4G/LTE base station 404 may refer to a base station that utilizes 4G/LTE RAT.
  • 4G/LTE base station 404 may be part of a 4G/LTE network or part of a 5G (NSA) network.
  • UE 402 and 4G/LTE base station 404 may be configured to communicate information, such as user data and/or measurement configuration data, back and forth to each other.
  • UE 402 may be registered for service in a 4G/LTE wireless communication network associated with 4G/LTE base station 404 and/or may have a radio resource control (RRC) connection with 4G/LTE base station 404.
  • RRC radio resource control
  • UE 402 may have a RRC connection with a network associated with 4G/LTE base station 404 to transmit/receive information to/from 4G/LTE base station 404, e.g., to upload and/or download information.
  • UE 402 may perform measurements of parameters associated with 5G (SA) base station 406 while it is registered for service in a 4G/LTE wireless communication network associated with 4G/LTE base station 404.
  • measurements of parameters associated with 5G (SA) base station 406 may be triggered while UE 402 is registered for service in a 4G/LTE wireless communication network associated with 4G/LTE base station 404.
  • UE 402 may trigger and/or perform the measurements of parameters associated with 5G (SA) base station 406, as is illustrated in FIG. 4 with communication 412 between UE 402 and 5G (SA) base station 406.
  • 5G (SA) base station 406 may trigger the UE to perform measurements of parameters associated with 5G (SA) base station 406, as is illustrated in FIG.
  • UE 402 may receive, detect, and/or measure a RSRP associated with 5G (SA) base station 406.
  • UE 402 may make a decision 413 based on processing of the RSRP associated with 5G (SA) base station 406. For example, UE 402 may make a decision 413 as to whether or not the RSRP associated with 5G (SA) base station 406 is less than, equal to, or greater than a first threshold, shown in FIG. 4 as threshold “thresholdNR. ”
  • UE 402 may determine at decision 413 that a measured RSRP associated with 5G (SA) base station 406 is less than (or equal to) the “thresholdNR” threshold used at decision 413.
  • the determination made at decision 413 may be performed while UE 402 is registered in a 4G/LTE network associated with 4G/LTE base station 404.
  • the foregoing actions, such as the determination made at decision 413 may correspond to actions shown at block 302 of FIG. 3, such as the determining, by a UE, that a RSRP associated with a second base station is less than a first threshold.
  • the determination made by UE 402 at decision 413 that the measured RSRP associated with 5G (SA) base station 406 is less than (or equal to) the “thresholdNR” threshold used at decision 413 may correspond to the determination that a RSRP associated with a second base station is less than a first threshold, as shown at block 302 of FIG. 3.
  • the RSRP associated with 5G (SA) base station 406 may correspond to the RSRP shown at block 302 of FIG. 3
  • the thresholdNR threshold used at decision 413 may correspond to the first threshold shown at block 302 of FIG. 3.
  • the first base station shown at block 302 of FIG. 3 may not be a 5G (SA) base station.
  • the first base station shown at block 302 of FIG. 3 may be 4G/LTE base station 404, which may be part of a 4G/LTE network or part of a 5G (NSA) network.
  • the first wireless communication network shown at block 302 of FIG. 3 may be a 4G/LTE network.
  • 4G/LTE base station 404 may be referred to as a primary/anchor base station.
  • the second base station shown at block 302 of FIG. 3 may be a 5G (SA) base station.
  • the second base station shown at block 302 of FIG. 3 may be 5G (SA) base station 406, which may be part of a 5G (SA) network.
  • SA 5G
  • UE 402 may make another decision 414 upon determining at decision 413 that the RSRP associated with 5G (SA) base station 406 is less than (or equal to) the thresholdNR threshold used at decision 413. For example, UE 402 may make a decision 414 as to whether or not the RSRP associated with 5G (SA) base station 406 is less than, equal to, or greater than a second threshold, shown in FIG. 4 as threshold “CUST_THRESHOLD_NR. ”
  • UE 402 may determine at decision 414 that the measured RSRP associated with 5G (SA) base station 406 is less than (or equal to) the “CUST_THRESHOLD_NR” threshold used at decision 414. In some aspects, upon determining at decision 414 that the RSRP associated with 5G (SA) base station 406 is less than (or equal to) the CUST_THRESHOLD_NR threshold used at decision 414, UE 402 may not proceed with attempting to handover or redirect to a 5G (SA) network. Instead, UE 402 may wait until another measurement of parameters associated with 5G (SA) base station 406 is triggered before returning to decision 413.
  • SA 5G
  • UE 402 may determine at decision 414 that the measured RSRP associated with 5G (SA) base station 406 is greater than the “CUST_THRESHOLD_NR” threshold used at decision 414.
  • the foregoing actions such as the determination made at decision 414, may correspond to actions shown at block 304 of FIG. 3, such as the determining, by the UE, that the RSRP associated with a second base station is greater than a second threshold.
  • the determination made by UE 402 at decision 414 that the measured RSRP associated with 5G (SA) base station 406 is greater than the “CUST_THRESHOLD_NR” threshold used at decision 414 may correspond to the determination that the RSRP associated with the second base station is greater than the second threshold, as shown at block 304 of FIG. 3.
  • the CUST_THRESHOLD_NR threshold used at decision 414 may correspond to the second threshold shown at block 304 of FIG. 3.
  • UE 402 may transmit to the first base station, e.g., 4G/LTE base station 404, a measurement report message 415 associated with the first threshold, e.g., the thresholdNR threshold.
  • the transmitted measurement report message 415 may be and/or may include an indication that the RSRP associated with the second base station, e.g., 5G (SA) base station 406, is greater than the first threshold, e.g., the thresholdNR threshold.
  • the transmitted indication may be an “Event B1” indication and/or an “Event B2” indication, as is illustrated in FIG. 4 as being included in measurement report message 415.
  • inclusion of the “Event B1” indication in the measurement report message 415 may indicate that the RSRP associated with the 5G (SA) base station 406, e.g., the second base station, is greater than the thresholdNR threshold, e.g., the first threshold.
  • SA 5G
  • inclusion of the“Event B2” indication in the measurement report message 415 may indicate that the RSRP associated with the 5G (SA) base station 406 is greater than the thresholdNR threshold and that an RSRP associated with the 4G/LTE base station 404, e.g., the first base station, is less than another (third) threshold.
  • transmission of measurement report message 415 may also be triggered based on decision 413.
  • UE 402 may determine at decision 413 that a measured RSRP associated with 5G (SA) base station 406 is greater than the “thresholdNR” threshold used at decision 413.
  • UE 402 may transmit to 4G/LTE base station 404 measurement report message 415.
  • 4G/LTE base station 404 in response to receiving the measurement report message 415, 4G/LTE base station 404, e.g., the first base station, may send to UE 402 a message 416, e.g., the MobilityFromEUTRACommand message or RRCConnectionRelease with redirectedCarrierInfo nr-r15 message shown in FIG. 4.
  • UE 402 may receive the message 416 sent by 4G/LTE base station 404.
  • the received message 416 may itself be and/or may include an indication to register UE 402 in the 5G (SA) network associated with 5G (SA) base station 406, e.g., a second wireless communication network associated with the second base station.
  • the received message 416 and/or any indications provided with message 416 may be associated with, e.g., based on or responsive to, the transmitted measurement report message 415, the Event B1 indication, and/or the Event B2 indication.
  • UE 402 may trigger a registration procedure with 5G (SA) base station 406 to register UE 402 in a 5G (SA) network so that UE 402 may receive 5G (SA) network service.
  • SA 5G
  • UE 402 may trigger a registration procedure to register UE 402 for service in a second wireless communication network associated with the second base station, e.g., the 5G (SA) network associated with 5G (SA) base station 406.
  • the registration procedure to register UE 402 in a 5G (SA) network associated with 5G (SA) base station 406 may be triggered upon, based on, or responsive to, UE 402 receiving message 416 and/or any indications provided with message 416 from 4G/LTE base station 404, such as the indication to register UE 402 in the 5G (SA) network associated with 5G (SA) base station 406.
  • the registration procedure to register UE 402 in a 5G (SA) network associated with 5G (SA) base station 406 may also be triggered based on, or responsive to, the determination made by UE 402 at decision 414.
  • UE 402 may trigger the registration procedure to register UE 402 in a 5G (SA) network associated with 5G (SA) base station 406, e.g., a second wireless communication network associated with the second base station, upon determining that the RSRP associated with the 5G (SA) base station 406 is greater than a second threshold, such as at decision 414.
  • the foregoing actions may correspond to actions shown at block 304 of FIG. 3, such as the triggering, by the UE, of a registration procedure to register the UE in a second wireless communication network associated with the second base station upon determining that the RSRP associated with the second base station is greater than a second threshold.
  • the triggered registration procedure with 5G (SA) base station 406 shown in FIG. 4 may correspond to the triggered registration procedure shown at block 304 of FIG. 3.
  • the registration procedure triggered by UE 402 with 5G (SA) base station 406 to register UE 402 in a 5G (SA) network associated with 5G (SA) base station 406 may include various operations.
  • the triggered registration procedure may include communication 417 between UE 402 and 5G (SA) base station 406 so that UE 402 may acquire the target 5G (SA) base station 406 technology.
  • the triggered registration procedure may also include UE 402 transmitting a message 418 indicating that an RRC connection configuration between UE 402 and 5G (SA) base station 406 is complete.
  • the second threshold e.g., the CUST_THRESHOLD_NR threshold used at decision 414
  • a value of the second threshold may be adjusted from a first value to a second value that is different than the first value.
  • the value of the second threshold may be adjusted from a first value to a second value after the UE determines at decision 414 that the measured RSRP associated with 5G (SA) base station 406 is less than (or equal to) the currently used second threshold, e.g., the “CUST_THRESHOLD_NR” threshold used at decision 414.
  • the second threshold e.g., the CUST_THRESHOLD_NR threshold used at decision 414
  • the first threshold e.g., the thresholdNR threshold used at decision 413.
  • the first threshold e.g., the thresholdNR threshold used at decision 413
  • the first threshold may be a fixed threshold.
  • the first threshold may be preset by a wireless communication network or a wireless communication specification, such as a 3GPP specification, to a value and may not be adjusted from that value.
  • the first threshold and/or the second threshold may be provided to UE 402 by 4G/LTE base station 404.
  • 4G/LTE base station 404 may transmit to UE 402 a message 411, e.g., a measurement configuration message, that includes the first threshold and/or the second threshold.
  • 4G/LTE base station 404 may provide to UE 402 the first threshold and/or the second threshold in a message transmitted from 4G/LTE base station 404 to UE 402 as part of communication 410.
  • techniques for handover and redirection of a UE from 4G network service to 5G (SA) network service may include a UE determining that a RSRP associated with a second base station is less than a first threshold while the UE is registered in a first wireless communication network associated with a first base station.
  • Techniques for handover and redirection of a UE from 4G network service to 5G (SA) network service may also include triggering a registration procedure to register the UE in a second wireless communication network associated with the second base station upon determining that the RSRP associated with the second base station is greater than a second threshold.
  • Techniques for handover and redirection of a UE from 4G network service to 5G (SA) network service may include additional aspects, such as any single aspect or any combination of aspects described below and/or in connection with one or more other processes described elsewhere herein.
  • the UE may transmit to the first base station a measurement report associated with the first threshold upon determining that the RSRP associated with the second base station is greater than the second threshold.
  • the UE may receive from the first base station an indication to register the UE in the second wireless communication network associated with the second base station, wherein the received indication is associated with the transmitted measurement report, and wherein the registration procedure is triggered upon receiving the indication from the first base station.
  • the second threshold may be adjustable.
  • the first base station may not be a 5G (SA) base station.
  • SA 5G
  • the second base station may be a 5G (SA) base station.
  • SA 5G
  • the functional blocks and modules described herein may comprise processors, electronics devices, hardware devices, electronics components, logical circuits, memories, software codes, firmware codes, etc., or any combination thereof.
  • features discussed herein may be implemented via specialized processor circuitry, via executable instructions, and/or combinations thereof.
  • DSP digital signal processor
  • ASIC application specific integrated circuit
  • FPGA field programmable gate array
  • a general-purpose processor may be a microprocessor, but in the alternative, the processor may be any conventional processor, controller, microcontroller, or state machine.
  • a processor may also be implemented as a combination of computing devices, e.g., a combination of a DSP and a microprocessor, a plurality of microprocessors, one or more microprocessors in conjunction with a DSP core, or any other such configuration.
  • a software module may reside in RAM memory, flash memory, ROM memory, EPROM memory, EEPROM memory, registers, hard disk, a removable disk, a CD-ROM, or any other form of storage medium known in the art.
  • An exemplary storage medium is coupled to the processor such that the processor can read information from, and write information to, the storage medium.
  • the storage medium may be integral to the processor.
  • the processor and the storage medium may reside in an ASIC.
  • the ASIC may reside in a user terminal.
  • the processor and the storage medium may reside as discrete components in a user terminal.
  • the functions described may be implemented in hardware, software, firmware, or any combination thereof. If implemented in software, the functions may be stored on or transmitted over as one or more instructions or code on a computer-readable medium.
  • Computer-readable media includes both computer storage media and communication media including any medium that facilitates transfer of a computer program from one place to another. Computer-readable storage media may be any available media that can be accessed by a general purpose or special purpose computer.
  • such computer-readable media can comprise RAM, ROM, EEPROM, CD-ROM or other optical disk storage, magnetic disk storage or other magnetic storage devices, or any other medium that can be used to carry or store desired program code means in the form of instructions or data structures and that can be accessed by a general-purpose or special-purpose computer, or a general-purpose or special-purpose processor.
  • a connection may be properly termed a computer-readable medium.
  • the software is transmitted from a website, server, or other remote source using a coaxial cable, fiber optic cable, twisted pair, or digital subscriber line (DSL) , then the coaxial cable, fiber optic cable, twisted pair, or DSL, are included in the definition of medium.
  • DSL digital subscriber line
  • Disk and disc includes compact disc (CD) , laser disc, optical disc, digital versatile disc (DVD) , hard disk, solid state disk, and blu-ray disc where disks usually reproduce data magnetically, while discs reproduce data optically with lasers. Combinations of the above should also be included within the scope of computer-readable media.
  • the term “and/or, ” when used in a list of two or more items means that any one of the listed items can be employed by itself, or any combination of two or more of the listed items can be employed.
  • the composition can contain A alone; B alone; C alone; A and B in combination; A and C in combination; B and C in combination; or A, B, and C in combination.

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  • Engineering & Computer Science (AREA)
  • Computer Networks & Wireless Communication (AREA)
  • Signal Processing (AREA)
  • Mobile Radio Communication Systems (AREA)

Abstract

La présente invention concerne des techniques de communication sans fil qui incluent des techniques de transfert intercellulaire ou de redirection d'un UE d'un service de réseau 4G à un service de réseau 5G (SA). Un UE peut déterminer qu'un RSRP associé à une seconde station de base est inférieur à un premier seuil pendant que l'UE est enregistré dans un premier réseau de communication sans fil associé à une première station de base. L'UE peut également déclencher une procédure d'enregistrement pour enregistrer l'UE dans un second réseau de communication sans fil associé à la seconde station de base lorsqu'il est déterminé que le RSRP associé à la seconde station de base est supérieur à un second seuil. D'autres aspects et caractéristiques sont également revendiqués et décrits.
PCT/CN2020/093893 2020-06-02 2020-06-02 Techniques de transfert intercellulaire ou de redirection d'équipement d'utilisateur de 4g à 5g (sa) WO2021243551A1 (fr)

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