[go: up one dir, main page]

WO2014089051A1 - Commande de mobilité de connexion améliorée pour réseaux à petites cellules - Google Patents

Commande de mobilité de connexion améliorée pour réseaux à petites cellules Download PDF

Info

Publication number
WO2014089051A1
WO2014089051A1 PCT/US2013/072833 US2013072833W WO2014089051A1 WO 2014089051 A1 WO2014089051 A1 WO 2014089051A1 US 2013072833 W US2013072833 W US 2013072833W WO 2014089051 A1 WO2014089051 A1 WO 2014089051A1
Authority
WO
WIPO (PCT)
Prior art keywords
wtru
tca
cell
base station
target cell
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Ceased
Application number
PCT/US2013/072833
Other languages
English (en)
Inventor
Joseph M. Murray
Athmane Touag
Jean-Louis Gauvreau
Yuying Dai
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
InterDigital Patent Holdings Inc
Original Assignee
InterDigital Patent Holdings Inc
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by InterDigital Patent Holdings Inc filed Critical InterDigital Patent Holdings Inc
Publication of WO2014089051A1 publication Critical patent/WO2014089051A1/fr
Anticipated expiration legal-status Critical
Ceased legal-status Critical Current

Links

Classifications

    • 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
    • H04W36/0079—Transmission or use of information for re-establishing the radio link in case of hand-off failure or rejection
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04W—WIRELESS COMMUNICATION NETWORKS
    • H04W36/00—Hand-off or reselection arrangements
    • H04W36/24—Reselection being triggered by specific parameters
    • H04W36/32—Reselection being triggered by specific parameters by location or mobility data, e.g. speed data
    • H04W36/322—Reselection being triggered by specific parameters by location or mobility data, e.g. speed data by location data
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04W—WIRELESS COMMUNICATION NETWORKS
    • H04W36/00—Hand-off or reselection arrangements
    • H04W36/24—Reselection being triggered by specific parameters
    • H04W36/32—Reselection being triggered by specific parameters by location or mobility data, e.g. speed data
    • H04W36/324—Reselection being triggered by specific parameters by location or mobility data, e.g. speed data by mobility data, e.g. speed data
    • 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
    • H04W36/00837—Determination of triggering parameters for hand-off
    • H04W36/008375—Determination of triggering parameters for hand-off based on historical data

Definitions

  • Connection mobility control is concerned with managing radio resources of cells of a wireless network and radio resources of wireless transmit/receive units (WTRUs) using the wireless network.
  • the WTRU may need to change which cell of the wireless network the WTRU is communicating with due to the WTRU moving or due to other WTRUs changing their use of the wireless network.
  • Wireless networks are becoming increasingly complex to meet the demands of ever increasing bandwidth and services demanded by the users.
  • Some wireless networks are using many more cells where the cell size is smaller, and some cells are using dynamic shared spectrum (DSS).
  • DSS dynamic shared spectrum
  • the small cells may offer more services than the large cells and the small cells may overlap and may be from different providers.
  • the smaller cell sizes provide less time for the WTRU to be handed over from the current cell to a new cell before the WTRU can no longer communicate with the current cell.
  • DSS dynamic shared spectrum
  • the use of DSS may mean that the configuration of the cell has changed and the WTRU may not be able to communicate with the cell without knowing the cell's current configuration.
  • the methods may include receiving a location information of a wireless transmit/receive unit WTRU.
  • the method may include determining a location of the WTRU.
  • the methods may include determining a target cell area TCA for the WTRU based on the location information of the WTRU.
  • the TCA comprises one or more target cells.
  • the methods may further include transmitting at least one target cell to the WTRU.
  • Apparatuses and methods on a WTRU are disclosed for enhancing connection mobility control for small cell networks, the methods may include receiving a target cell area TCA from a base station.
  • the TCA may include one or more target cells.
  • the methods may include responding to a radio link failure (RLF) or handover failure by selecting a target cell from the TCA, and transmitting a connection reestablishment request to the selected target cell.
  • RLF radio link failure
  • FIG. 1A is a system diagram of an example communications system in which one or more disclosed embodiments may be implemented
  • FIG. IB is a system diagram of an example wireless transmit/receive unit (WTRU) that may be used within the communications system illustrated in FIG. 1A;
  • WTRU wireless transmit/receive unit
  • FIG. 1C is a system diagram of an example radio access network and an example core network that may be used within the communications system illustrated in FIG. 1A;
  • FIG. 2 illustrates a wireless network 200 and a WTRU. Illustrated in FIG. 2 is a WTRU 102, base stations 114, and cells 202;
  • FIG. 3A illustrates handover occurrence frequency vs. cell radius for different speeds of the user equipment (UE) 300 according to a simulation;
  • FIG. 3B illustrates small cell mobility radio link failure rates (RLF)
  • FIG. 3C illustrates RLF rate vs. measurement window size/report interval for small cell radius of 50 meters 340 according to a simulation
  • FIG. 3D illustrates RLF percentages at different HO stages for a small cell radius of 50m
  • FIG. 4 illustrates a system for adaptive measurement reporting
  • FIG. 5 illustrates a signaling diagram according to some embodiments
  • FIG. 6 illustrates a mobile WTRU 202 traveling from cell 202n to cell 202m;
  • FIG. 7 illustrates a WTRU and base station according to some disclosed embodiments
  • FIG. 8 illustrates a candidate target cell list 800 according to some embodiments
  • FIG. 9 illustrates a wireless network 900 with a target cell area of bordering cells according to some embodiments
  • FIG. 10 illustrates a wireless network 1000 with a target cell area of cells of a predicted trajectory 1008 of a WTRU 102 according to some embodiments
  • FIG. 11 illustrates a wireless network 1100 with a target cell area of cells based on a predicted trajectory 1108 of a WTRU 102 according to some embodiments
  • FIG. 12 illustrates a wireless network 1200 with a target cell area of cells based on a predicted trajectory 1208 of a WTRU 102 according to some embodiments
  • FIG. 13 illustrates an example of a WTRU and a base station signaling regarding an explicit route
  • FIG. 14 illustrates an example of mobility reporting and proactive base station preparation according to some embodiments
  • FIG. 15 is an example of an enhanced handover according to some disclosed embodiments
  • FIG. 16 is an example of an enhanced handover according to some disclosed embodiments.
  • FIG. 17 is an example of an enhanced RRC connection re- establishment method according to some disclosed embodiments.
  • FIG. 18 is an example of an enhanced RRC connection re- establishment method according to some disclosed embodiments.
  • FIG. 19 illustrates an example of a method of enhanced RRC connection re-establishment with an unprepared base station according to some embodiments
  • FIG. 20 illustrates an example of a method of enhanced RRC connection re-establishment with an unprepared base station according to some embodiments
  • FIG. 21 illustrates an example of a method 2100 of RRC connection re-establishment with a macro cell layer according to some disclosed embodiments
  • FIG. 22 illustrates an example of an automatic neighbor relation
  • FIG. 23 illustrates an example of a simulation test bed layout 2300 used to generate disclosed simulation results
  • FIG. 24 illustrates downlink and uplink link budget calculations used to generate disclosed simulation results.
  • FIG. 1A is a diagram of an example communications system 100 in which one or more disclosed embodiments may be implemented.
  • the communications system 100 may be a multiple access system that provides content, such as voice, data, video, messaging, broadcast, etc., to multiple wireless users.
  • the communications system 100 may enable multiple wireless users to access such content through the sharing of system resources, including wireless bandwidth.
  • the communications systems 100 may employ one or more channel access methods, such as code division multiple access (CDMA), time division multiple access (TDMA), frequency division multiple access (FDMA), orthogonal FDMA (OFDMA), single-carrier FDMA (SC-FDMA), and the like.
  • CDMA code division multiple access
  • TDMA time division multiple access
  • FDMA frequency division multiple access
  • OFDMA orthogonal FDMA
  • SC-FDMA single-carrier FDMA
  • the communications system 100 may include wireless transmit/receive units (WTRUs) 102a, 102b, 102c, 102d, a radio access network (RAN) 104, a core network 106, a public switched telephone network (PSTN) 108, the Internet 110, and other networks 112, though it will be appreciated that the disclosed embodiments contemplate any number of WTRUs, base stations, networks, and/or network elements.
  • WTRUs 102a, 102b, 102c, 102d may be any type of device configured to operate and/or communicate in a wireless environment.
  • the WTRUs 102a, 102b, 102c, 102d may be configured to transmit and/or receive wireless signals and may include user equipment (UE), a mobile station, a fixed or mobile subscriber unit, a pager, a cellular telephone, a personal digital assistant (PDA), a smartphone, a laptop, a netbook, a personal computer, a wireless sensor, consumer electronics, and the like.
  • UE user equipment
  • PDA personal digital assistant
  • smartphone a laptop
  • netbook a personal computer
  • a wireless sensor consumer electronics, and the like.
  • the communications systems 100 may also include a base station
  • Each of the base stations 114a, 114b may be any type of device configured to wirelessly interface with at least one of the WTRUs 102a, 102b, 102c, 102d to facilitate access to one or more communication networks, such as the core network 106, the Internet 110, and/or the networks 112.
  • the base stations 114a, 114b may be a base transceiver station (BTS), a Node-B, an eNode B, a Home Node B, a Home eNode B, a site controller, an access point (AP), a wireless router, and the like.
  • BTS base transceiver station
  • AP access point
  • the base station 114a may be part of the RAN 104, which may also include other base stations and/or network elements (not shown), such as a base station controller (BSC), a radio network controller (RNC), relay nodes, etc.
  • BSC base station controller
  • RNC radio network controller
  • the base station 114a and/or the base station 114b may be configured to transmit and/or receive wireless signals within a particular geographic region, which may be referred to as a cell (not shown).
  • the cell may further be divided into cell sectors. For example, the cell associated with the base station 114a may be divided into three sectors.
  • the base station 114a may include three transceivers, i.e., one for each sector of the cell.
  • the base station 114a may employ multiple -input multiple output (MIMO) technology and, therefore, may utilize multiple transceivers for each sector of the cell.
  • MIMO multiple -input multiple output
  • the base stations 114a, 114b may communicate with one or more of the WTRUs 102a, 102b, 102c, 102d over an air interface 116, which may be any suitable wireless communication link (e.g., radio frequency (RF), microwave, infrared (IR), ultraviolet (UV), visible light, etc.).
  • the air interface 116 may be established using any suitable radio access technology (RAT).
  • RAT radio access technology
  • the communications system 100 may be a multiple access system and may employ one or more channel access schemes, such as CDMA, TDMA, FDMA, OFDMA, SC-FDMA, and the like.
  • the base station 114a in the RAN 104 and the WTRUs 102a, 102b, 102c may implement a radio technology such as Universal Mobile Telecommunications System (UMTS) Terrestrial Radio Access (UTRA), which may establish the air interface 116 using wideband CDMA (WCDMA).
  • WCDMA may include communication protocols such as High-Speed Packet Access (HSPA) and/or Evolved HSPA (HSPA+).
  • HSPA may include High-Speed Downlink Packet Access (HSDPA) and/or High-Speed Uplink Packet Access (HSUPA).
  • the base station 114a and the WTRUs are identical to the base station 114a and the WTRUs.
  • E-UTRA Evolved UMTS Terrestrial Radio Access
  • LTE Long Term Evolution
  • LTE-A LTE-Advanced
  • 102b, 102c may implement radio technologies such as IEEE 802.16 (i.e., Worldwide Interoperability for Microwave Access (WiMAX)), CDMA2000, CDMA2000 IX, CDMA2000 EV-DO, Interim Standard 2000 (IS-2000), Interim Standard 95 (IS-95), Interim Standard 856 (IS-856), Global System for Mobile communications (GSM), Enhanced Data rates for GSM Evolution (EDGE), GSM EDGE (GERAN), and the like.
  • IEEE 802.16 i.e., Worldwide Interoperability for Microwave Access (WiMAX)
  • CDMA2000, CDMA2000 IX, CDMA2000 EV-DO Code Division Multiple Access 2000
  • IS-95 IS-95
  • IS-856 Interim Standard 856
  • GSM Global System for Mobile communications
  • GSM Global System for Mobile communications
  • EDGE Enhanced Data rates for GSM Evolution
  • GERAN GSM EDGERAN
  • the base station 114b in FIG. 1A may be a wireless router, Home
  • Node B, Home eNode B, or access point may utilize any suitable RAT for facilitating wireless connectivity in a localized area, such as a place of business, a home, a vehicle, a campus, and the like.
  • the base station 114b and the WTRUs 102c, 102d may implement a radio technology such as IEEE 802.11 to establish a wireless local area network (WLAN).
  • the base station 114b and the WTRUs 102c, 102d may implement a radio technology such as IEEE 802.15 to establish a wireless personal area network (WPAN).
  • WLAN wireless local area network
  • WPAN wireless personal area network
  • the base station 114b and the WTRUs 102c, 102d may utilize a cellular-based RAT (e.g., WCDMA, CDMA2000, GSM, LTE, LTE-A, etc.) to establish a picocell or femtocell.
  • a cellular-based RAT e.g., WCDMA, CDMA2000, GSM, LTE, LTE-A, etc.
  • the base station 114b may have a direct connection to the Internet 110.
  • the base station 114b may not be required to access the Internet 110 via the core network 106.
  • the RAN 104 may be in communication with the core network 106, which may be any type of network configured to provide voice, data, applications, and/or voice over internet protocol (V oIP) services to one or more of the WTRUs 102a, 102b, 102c, 102d.
  • the core network 106 may provide call control, billing services, mobile location-based services, pre-paid calling, Internet connectivity, video distribution, etc., and/or perform high-level security functions, such as user authentication.
  • the RAN 104 and/or the core network 106 may be in direct or indirect communication with other RANs that employ the same RAT as the RAN 104 or a different RAT.
  • the core network 106 may also be in communication with another RAN (not shown) employing a GSM radio technology.
  • the core network 106 may also serve as a gateway for the WTRUs
  • the PSTN 108 may include circuit- switched telephone networks that provide plain old telephone service (POTS).
  • POTS plain old telephone service
  • the Internet 110 may include a global system of interconnected computer networks and devices that use common communication protocols, such as the transmission control protocol (TCP), user datagram protocol (UDP) and the internet protocol (IP) in the TCP/IP internet protocol suite.
  • TCP transmission control protocol
  • UDP user datagram protocol
  • IP internet protocol
  • the networks 112 may include wired or wireless communications networks owned and/or operated by other service providers.
  • the networks 112 may include another core network connected to one or more RANs, which may employ the same RAT as the RAN 104 or a different RAT.
  • Some or all of the WTRUs 102a, 102b, 102c, 102d in the communications system 100 may include multi-mode capabilities, i.e., the WTRUs 102a, 102b, 102c, 102d may include multiple transceivers for communicating with different wireless networks over different wireless links.
  • the WTRU 102c shown in FIG. 1A may be configured to communicate with the base station 114a, which may employ a cellular -based radio technology, and with the base station 114b, which may employ an IEEE 802 radio technology.
  • FIG. IB is a system diagram of an example WTRU 102.
  • the WTRU 102 may include a processor 118, a transceiver 120, a transmit/receive element 122, a speaker/microphone 124, a keypad 126, a display/touchpad 128, non-removable memory 106, removable memory 132, a power source 134, a global positioning system (GPS) chipset 136, and other peripherals 138.
  • GPS global positioning system
  • the processor 118 may be a general purpose processor, a special purpose processor, a conventional processor, a digital signal processor (DSP), a plurality of microprocessors, one or more microprocessors in association with a DSP core, a controller, a microcontroller, Application Specific Integrated Circuits (ASICs), Field Programmable Gate Array (FPGAs) circuits, any other type of integrated circuit (IC), a state machine, and the like.
  • the processor 118 may perform signal coding, data processing, power control, input/output processing, and/or any other functionality that enables the WTRU 102 to operate in a wireless environment.
  • the processor 118 may be coupled to the transceiver 120, which may be coupled to the transmit/receive element 122. While FIG. IB depicts the processor 118 and the transceiver 120 as separate components, it will be appreciated that the processor 118 and the transceiver 120 may be integrated together in an electronic package or chip.
  • the transmit/receive element 122 may be configured to transmit signals to, or receive signals from, a base station (e.g., the base station 114a) over the air interface 116.
  • a base station e.g., the base station 114a
  • the transmit/receive element 122 may be an antenna configured to transmit and/or receive RF signals.
  • the transmit/receive element 122 may be an emitter/detector configured to transmit and/or receive IR, UV, or visible light signals, for example.
  • the transmit/receive element 122 may be configured to transmit and receive both RF and light signals. It will be appreciated that the transmit/receive element 122 may be configured to transmit and/or receive any combination of wireless signals.
  • the WTRU 102 may include any number of transmit/receive elements 122. More specifically, the WTRU 102 may employ MIMO technology. Thus, in one embodiment, the WTRU 102 may include two or more transmit/receive elements 122 (e.g., multiple antennas) for transmitting and receiving wireless signals over the air interface 116.
  • the transceiver 120 may be configured to modulate the signals that are to be transmitted by the transmit/receive element 122 and to demodulate the signals that are received by the transmit/receive element 122.
  • the WTRU 102 may have multi-mode capabilities.
  • the transceiver 120 may include multiple transceivers for enabling the WTRU 102 to communicate via multiple RATs, such as UTRA and IEEE 802.11, for example.
  • the processor 118 of the WTRU 102 may be coupled to, and may receive user input data from, the speaker/microphone 124, the keypad 126, and/or the display/touchpad 128 (e.g., a liquid crystal display (LCD) display unit or organic light-emitting diode (OLED) display unit).
  • the processor 118 may also output user data to the speaker/microphone 124, the keypad 126, and/or the display/touchpad 128.
  • the processor 118 may access information from, and store data in, any type of suitable memory, such as the non-removable memory 106 and/or the removable memory 132.
  • the non-removable memory 106 may include random-access memory (RAM), read-only memory (ROM), a hard disk, or any other type of memory storage device.
  • the removable memory 132 may include a subscriber identity module (SIM) card, a memory stick, a secure digital (SD) memory card, and the like.
  • SIM subscriber identity module
  • SD secure digital
  • the processor 118 may access information from, and store data in, memory that is not physically located on the WTRU 102, such as on a server or a home computer (not shown).
  • the processor 118 may receive power from the power source 134, and may be configured to distribute and/or control the power to the other components in the WTRU 102.
  • the power source 134 may be any suitable device for powering the WTRU 102.
  • the power source 134 may include one or more dry cell batteries (e.g., nickel-cadmium (NiCd), nickel-zinc (NiZn), nickel metal hydride (NiMH), lithium-ion (Li-ion), etc.), solar cells, fuel cells, and the like.
  • the processor 118 may also be coupled to the GPS chipset 136, which may be configured to provide location information (e.g., longitude and latitude) regarding the current location of the WTRU 102.
  • location information e.g., longitude and latitude
  • the WTRU 102 may receive location information over the air interface 116 from a base station (e.g., base stations 114a, 114b) and/or determine its location based on the timing of the signals being received from two or more nearby base stations. It will be appreciated that the WTRU 102 may acquire location information by way of any suitable location- determination method while remaining consistent with an embodiment.
  • the processor 118 may further be coupled to other peripherals 138, which may include one or more software and/or hardware modules that provide additional features, functionality and/or wired or wireless connectivity.
  • the peripherals 138 may include an accelerometer, an e-compass, a satellite transceiver, a digital camera (for photographs or video), a universal serial bus (USB) port, a vibration device, a television transceiver, a hands free headset, a Bluetooth® module, a frequency modulated (FM) radio unit, a digital music player, a media player, a video game player module, an Internet browser, and the like.
  • the peripherals 138 may include an accelerometer, an e-compass, a satellite transceiver, a digital camera (for photographs or video), a universal serial bus (USB) port, a vibration device, a television transceiver, a hands free headset, a Bluetooth® module, a frequency modulated (FM) radio unit, a digital music player, a media player, a video game player
  • FIG. 1C is a system diagram of the RAN 104 and the core network
  • the RAN 104 may employ an E-UTRA radio technology to communicate with the WTRUs 102a, 102b, 102c over the air interface 116.
  • the RAN 104 may also be in communication with the core network 106.
  • the RAN 104 may include eNode-Bs 140a, 140b, 140c, though it will be appreciated that the RAN 104 may include any number of eNode-Bs while remaining consistent with an embodiment.
  • the eNode-Bs 140a, 140b, 140c may each include one or more transceivers for communicating with the WTRUs 102a, 102b, 102c over the air interface 116.
  • the eNode-Bs 140a, 140b, 140c may implement MIMO technology.
  • the eNode-B 140a for example, may use multiple antennas to transmit wireless signals to, and receive wireless signals from, the WTRU 102a.
  • Each of the eNode-Bs 140a, 140b, 140c may be associated with a particular cell (not shown) and may be configured to handle radio resource management decisions, handover decisions, scheduling of users in the uplink and/or downlink, and the like. As shown in FIG. 1C, the eNode-Bs 140a, 140b, 140c may communicate with one another over an X2 interface.
  • the core network 106 shown in FIG. 1C may include a mobility management gateway (MME) 142, a serving gateway 144, and a packet data network (PDN) gateway 146. While each of the foregoing elements are depicted as part of the core network 106, it will be appreciated that any one of these elements may be owned and/or operated by an entity other than the core network operator.
  • MME mobility management gateway
  • PDN packet data network
  • the MME 142 may be connected to each of the eNode-Bs 142a,
  • the MME 142 may be responsible for authenticating users of the WTRUs 102a, 102b, 102c, bearer activation/deactivation, selecting a particular serving gateway during an initial attach of the WTRUs 102a, 102b, 102c, and the like.
  • the MME 142 may also provide a control plane function for switching between the RAN 104 and other RANs (not shown) that employ other radio technologies, such as GSM or WCDMA.
  • the serving gateway 144 may be connected to each of the eNode Bs
  • the serving gateway 144 may generally route and forward user data packets to/from the WTRUs 102a, 102b, 102c.
  • the serving gateway 144 may also perform other functions, such as anchoring user planes during inter-eNode B handovers, triggering paging when downlink data is available for the WTRUs 102a, 102b, 102c, managing and storing contexts of the WTRUs 102a, 102b, 102c, and the like.
  • the serving gateway 144 may also be connected to the PDN gateway 146, which may provide the WTRUs 102a, 102b, 102c with access to packet-switched networks, such as the Internet 110, to facilitate communications between the WTRUs 102a, 102b, 102c and IP-enabled devices.
  • the PDN gateway 146 may provide the WTRUs 102a, 102b, 102c with access to packet-switched networks, such as the Internet 110, to facilitate communications between the WTRUs 102a, 102b, 102c and IP-enabled devices.
  • the core network 106 may facilitate communications with other networks.
  • the core network 106 may provide the WTRUs 102a, 102b, 102c with access to circuit- switched networks, such as the PSTN 108, to facilitate communications between the WTRUs 102a, 102b, 102c and traditional land-line communications devices.
  • the core network 106 may include, or may communicate with, an IP gateway (e.g., an IP multimedia subsystem (IMS) server) that serves as an interface between the core network 106 and the PSTN 108.
  • IMS IP multimedia subsystem
  • the core network 106 may provide the WTRUs 102a, 102b, 102c with access to the networks 112, which may include other wired or wireless networks that are owned and/or operated by other service providers.
  • FIG. 2 illustrates a wireless network 200 and a WTRU 102.
  • FIG. 2 Illustrated in FIG. 2 is a WTRU 102, base stations 114, and cells 202.
  • the base stations 114c through 114i may be base stations 114 for the corresponding small cells 202c through 202i.
  • the base station 114j may be a base station for a macro cell 202j.
  • the wireless network 200 may not include a macro cell 202j.
  • the base stations 114 may serve the corresponding cell 220. In some embodiments, more than one base station 114 may be used to serve a cell 202.
  • the cells 220c through 220j may overlap.
  • Overlapping cells 202 may cause increased inter-cell interference because the WTRU 102 may cross the coverage area of the cell 202 that the WTRU 102 is attached to, which may cause the WTRU 102 to transmit in a cell 202 in which the WTRU 102 is not attached. Additionally, overlapping cells 202 may cause the WTRU 102 to ping-pong between cells 202 since the cell 202 the WTRU 102 is attached to may have the same signal strength in portions of the cell 202 as a neighboring cell 202. For example, the signal strength of cell 202f may be stronger than the signal strength of cell 202c to which the WTRU 102 is attached.
  • Small changes in the position of the WTRU 102 may result in the signal of the cell 202 that the WTRU 102 is not attached to becoming stronger than the signal that the WTRU 102 is attached to, so the WTRU 102 may handover between the two cells 202.
  • One or more of the base stations 114 may use dynamic shared spectrum (DSS).
  • the wireless network 200 may be a heterogeneous wireless network.
  • the base stations 114c through 114i may provide services that are not provided by the macro cell 114 j .
  • one or more of base stations 114c through 114i may provide 256QAM and the base station 114j may not provide 256QAM.
  • the base stations 114 may be from different networks that are deployed in the same area. In some embodiments, one or more of the base stations 114 may not be open or available to the WTRU 102.
  • base station 114c may be from a first public land mobile network (PLMN), and base station 114h may be from a second PLMN. The second PLMN may not permit roaming from WTRUs 102 of the first PLMN.
  • the WTRU 102 may perform measurements and/or reporting for cells 220 that the WTRU 102 is not permitted to use. In some embodiments, the WTRU 102 may perform measurements and/or reporting for two or more cells 220 that overlap. For example, as illustrated in FIG.
  • the WTRU 102 may be in the area of small cells 202c, 202d, 202f, and macro cell 202j.
  • the WTRU 102 may perform a measurement and/or reporting that includes small cells 202c, 202d, 202f, and macro cell 202j.
  • the cell 220 with the strongest signal for the WTRU 102 may not always be open for use by the WTRU 102.
  • the WTRU 102 may be mobile. In some embodiments, the WTRU
  • the WTRU 102 may be mobile by being transported by a transportation machine such as an automobile, bicycle, motorcycle, or airplane.
  • the WTRU 102 may be mobile by being transported by the user (not illustrated) of the WTRU 102.
  • the user may be walking or running.
  • the WTRU 102 may be signaling the base station 114c.
  • the WTRU 102 may be signaling the base station 114c.
  • a WTRU 102 may be said to be associated with the base station 114c.
  • a WTRU 102 may need to switch to or handover (HO) to a different base station 114.
  • the WTRU 102 is attached to base station 114c. If the WTRU 102 moves, it may need to attach (or be handed-over) to a different base station 114 such as base station 114f.
  • the frequency of HOs in a wireless network 200 may depend on the mobility of the WTRU 102, the size of the cell 202, and the activity of the user of the WTRU 102.
  • WTRUs 102 may be handed-over to a macro cell 202j. However, if the small base stations 114c through 114i operate in a different spectrum than the macro base station 114j or use DSS, then the WTRU 102 may receive services from the small base stations 114c through 114i that the WTRU 102 cannot receive from the macro base station 114 j . For example, in the case of offloading, it may be desirable for the WTRU 102 to remain attached to a core network (for example, core network 106 of FIG.
  • a core network for example, core network 106 of FIG.
  • a network operator may only have small base stations 114c through 114i available for the WTRU 102 to attach to.
  • FIG. 3A illustrates handover occurrence frequency vs. cell radius for different speeds of the user equipment (UE) 300 according to a simulation. Illustrated in FIG. 3A is a handover occurrence per UE per second 302 on the vertical axis, and cell radius 304 on the horizontal axis.
  • the UE may be a WTRU 102.
  • 3A illustrates that for a UE connected to small cell networks 114c through 114i, which may be employed in dynamic shared spectrum (DSS), the frequency of HOs may increase for smaller sized cells. Additionally, the HO signaling by the wireless network 200 and the UE may be increased as a result of the increased number of HOs.
  • DSS dynamic shared spectrum
  • FIG. 3B illustrates small cell mobility radio link failure rates (RLF)
  • FIG. 3B Illustrated in FIG. 3B is RLFs per UE per second 322 on the vertical axis, and cell radius 324 on the horizontal axis 324. There are three different bars 326, 328, 330 corresponding respectively to 30 km/h, 60 km/h, and 90 km/h for the speed of the UE. For example, with a cell radius of 50 meters and a UE speed of 60 km/hour, the expected number of RLFs per UE per second is 0.038.
  • 3B illustrates that mobile UEs in a wireless network 200 with small cells 220c through 220i are more likely to move out of the coverage range of the small base stations 114c through 114i that the UE is attached to before the HO is triggered or the HO command is received by the UE, which may result in an increase in RLF/HO failure rate.
  • FIG. 3C illustrates RLF rate vs. measurement window size/report interval for small cell radius of 50 meters 340 according to a simulation. Illustrated in FIG. 3C is RLFs per UE per second 342 on the vertical axis, and UE speed 344 on the horizontal axis. There are two different measurement window sizes 346 and 348 corresponding respectively to a measurement window size of 100 ms and 200 ms and report interval of 120 ms and 240 ms. For example, with a measurement window size of 200 ms and report interval of 240 ms, the expected RLF per UE per second is 0.038.
  • FIG. 3C illustrates RLF rate vs. measurement window size/report interval for small cell radius of 50 meters 340 according to a simulation. Illustrated in FIG. 3C is RLFs per UE per second 342 on the vertical axis, and UE speed 344 on the horizontal axis. There are two different measurement window sizes 346 and 348 corresponding respectively to a measurement window
  • 3C illustrates that the RLF failure rate may be lowered in wirelessly networks 200 with small cells 220c through 220i when the measure window size and report interval are reduced. Additionally, in some embodiments, the PCell may drop below a configured threshold s-Measure parameter more often, which will require the UE to perform and report more measurements.
  • FIG. 3D illustrates RLF percentages at different HO stages for a small cell radius of 50m. Illustrated in FIG. 3D is RLF percentage at different stages 362 on the vertical axis, and HO Stage 364 on the horizontal axis. There are three different stages. HO Stage 1: Before HO triggered at the eNB. HO Stage 2: After HO triggered at the eNB but before the HO command successfully received by the UE. HO Stage 3: After the HO command is received by the UE but before the HO complete is successfully sent by the UE to the cell 202. There are three different bars 366, 368, 370 corresponding respectively to 30 km/h, 60 km/h, and 90 km/h for the speed of the UE.
  • FIG. 3D illustrates that mobile UEs in a wireless network 200 with small cells 220c through 220i are more likely to move out of the coverage range of the small base stations 114c through 114i that the UE is attached to before the HO is triggered or the HO command is received by the UE, which may result in an increase in RLF/HO failure rate.
  • FIG. 4 illustrates a system for adaptive measurement reporting.
  • the WTRU 102 may include one or more of the following: a location 402, a speed or mobility 404, a measurement interval 406, measure reporting interval 408, measurement group 409, scaling factor 410, event 1 412, and event 2 414.
  • the location 402 may be a location as discussed above.
  • the location 402 may be a location determined from a GPS chipset 136.
  • the speed or mobility 404 may be a speed or mobility determination.
  • the speed or mobility 404 may be categories such as stationary, low mobility, medium mobility, or high mobility. Stationary may correspond to the WTRU 102 being relatively stationary.
  • Low mobility may correspond to the WTRU 102 moving a relatively low speed in comparison to an area of the cells 202.
  • low mobility may correspond to a user of the WTRU 102 walking.
  • Medium mobility may correspond to medium mobility such as a user bicycling or driving at a relatively slow speed.
  • High mobility may correspond to the WTRU 102 moving at relatively high speed such as in an automobile relative to an area of the cells 202.
  • the speed or mobility 404 may be a speed that is determined by the WTRU 102 or received from the base station 114.
  • the measurement interval 406 may be an interval or frequency for the WTRU 102 to collect measurements of base stations 114.
  • the measure reporting interval 408 may be an interval or frequency for the WTRU 102 to report measurements to the base station 114.
  • the measurement group 409 may be a group of base stations 114 for the WTRU 102 to take measurements of and/or to report measurements to.
  • the scaling factor 410 may be a factor for scaling the measure interval 406 and/or the measurement reporting interval 408.
  • the scaling factor may be medium or high, which may be signaled via a MeasConfig information element (IE) (not illustrated).
  • IE MeasConfig information element
  • the event 1 412 may be an event that is triggered at the WTRU
  • the event 2 414 may be an event that is triggered at the WTRU 102. Any of the above may be transmitted to the WTRU 102 from the base station 114.
  • the base station 114 may determine a speed or mobility 404 of the WTRU 102 and transmit the speed or mobility 404 to the WTRU 102.
  • the base station 114 may include one or more of the following a location 416, an area or range 418, and a cell type 420.
  • the location 402 may be a location as discussed above.
  • the area or range 418 may be an area or range of the base station 114.
  • the area or range 418 may be determined by the base station 114.
  • the cell type 420 may be a type of cell. For example, cell type may include small and macro.
  • WTRU 102 may be configured to adapt the measurement interval 406 and/or measurement reporting interval 408 for taking measurements and reporting measurements to one or more base stations 114.
  • the WTRU 102 may be configured to adapt the measurement group 409 which may include base stations 114 from which to take measurements and base stations 114 to which report measurements should be transmitted.
  • the WTRU 102 may be configured to adapt the measurement interval 406 and/or measurement reporting interval 408 based on one or more of the following: the speed or mobility 404 of the WTRU 102, the location of the WTRU 102, and the signal strength/quality of the downlink signal from a base station 114.
  • the WTRU 102 may base the measurement interval 406 and/or measurement reporting interval 408 on the speed or mobility 404 of the WTRU 102. For example, if the WTRU 102 starts to become more mobile, the measurement interval 406 and/or measurement reporting interval 408 may be reduced, which will increase the frequency of taking measurements and/or reporting measurements.
  • the WTRU 102 may be configured to scale down the measurement interval 406 and/or measurement reporting interval 408 when the WTRU 102 is near an edge of a cell 202.
  • the WTRU 102 may determine that it is near the edge of cell based on the location 402 of the WTRU 102 and the location 416 and/or area or range 418 of the base station 114.
  • the base station 114 may send to the WTRU 102 the location 416 and/or area or range 418 of the base station 114 via dedicated or broadcast signaling.
  • the WTRU 102 may be configured to scale down the measurement interval 406 and/or measurement reporting interval 408 on the condition when a downlink signal strength/quality is below a threshold.
  • the WTRU 102 may trigger event 1 412 on the condition that the speed or mobility 404 of the WTRU 102 is higher than a certain threshold. The WTRU 102 may only trigger event 1 if the WTRU 102 is connected to a small cell 202c through 202i.
  • the base station 114 may configure the WTRU 102 with a default measurement interval 406 and/or measurement reporting interval 408. In some embodiment, the base station 114 may configure the WTRU 102 with scaling factors, which may be default scaling factors. For example, the scaling factors may be sf-medium or sf- high signaled to the WTRU 102 from the base station 114.
  • the WTRU 102 may be configured to monitor whether or not the WTRU 102 is associated with or connected to a small cell 202c through 202i. If the WTRU 102 is connected to a small cell 202c through 202i, then the WTRU 102 may start to monitor the speed or mobility 404 of the WTRU 102.
  • the WTRU 102 may trigger event 1 and may scale down the measurement interval 406 and/or measurement reporting interval 408.
  • the scale may be based on predetermined scaling factors, scaling factors determined at the WTRU 102, or scaling factors received by the WTRU 102.
  • the WTRU 102 may send a configuration report to the base station 114.
  • the WTRU 102 may scale up the measurement interval 406 and/or measurement reporting interval 408 using a scaling factor which may be the inverse of the scaling factor used to scale down the measurement interval 406 and/or measurement reporting interval 408.
  • the WTRU 102 may send a message to the base station 114 reporting the measurement configuration which may include the measurement interval 406 and/or measurement reporting interval 408.
  • the WTRU 102 may trigger event 2 414 if the
  • WTRU 102 is connected to a small cell 202c through 202i and the WTRU 102 is approaching the geo-location of the edge of the cell 202c through 202i.
  • the base station 114 may configure the
  • the base station 114 may configure the WTRU 102 with scaling factors to use to adjust the measurement interval 406 and/or measurement reporting interval 408.
  • the base station 114 may configure the
  • the WTRU 102 may monitor for being connected to a small cell 202c through 202i.
  • the WTRU 102 may receive the location 416 and area or range 418 of the base station 114.
  • the WTRU 102 may monitor the location 402 of the WTRU 102 when the WTRU 102 detects that the WTRU 102 is connected to a small cell 202c through 202i. If the WTRU 102 detects that it is near the edge of the small cell 202c through 202i, then the WTRU 102 may trigger event 2 414.
  • the WTRU 102 may scale up the measurement interval 406 and/or measurement reporting interval 408.
  • the WTRU 102 may send an indication message to the base station 114 of the state of event 1 412 and/or event 2 414.
  • the WTRU 102 may indicate the triggering of event 1 412 and/or event 2 414 to the base station 114, which may respond with a scaling factor to change the measurement interval 406 and/or measurement reporting interval 408 or with a value for the measurement interval 406 and/or measurement reporting interval 408.
  • the WTRU 102 may reduce RLF and/or HO failure by adapting the measurement interval 406 and/or measurement reporting interval 408. In some embodiments, the WTRU 102 may adapt the measurement interval 406 and/or measurement reporting interval 408 based on an amount of power needed to take measurements and transmit measurement reports and/or based on an amount and available of signaling available to the WTRU 102.
  • FIG. 5 illustrates a signaling diagram according to some embodiments.
  • the WTRU 102 may transmit to the base station 114 an indication of an event 502, which may be event 1 412 and/or event 2 414.
  • the base station 114 may then determine an interval or scaling factor 506 for the WTRU 102.
  • the base station 114 may then transmit the interval or scaling factor to the WTRU 102 at 504.
  • FIG. 6 illustrates a mobile WTRU 202 traveling from cell 202n to cell 202m. Illustrated in FIG. 6 is a first base station 114n, a second base station 114m, the corresponding cells 202n, 202m, communication 602, communication 604, and WTRU 102.
  • the WTRU 102 travels 606 from the first cell 202n to the second cell 202m, but has not handed-over to the second base station 114m due to the speed with which the WTRU 102 traveled.
  • the communication 604 is a reliable communication.
  • the communication 602 may be an unreliable communication 602.
  • the WTRU 102 may experience an RLF or HO failure due to WTRU 102 traveling 606.
  • FIG. 7 illustrates a WTRU 102 and base station 114m according to some disclosed embodiments. Illustrated in FIG. 7 are base station 114n, base station 114m, and a WTRU 102.
  • the base station 114m may include a target cell area 702 and information 708.
  • the target cell area (TCA) 702 may include WTRU 704 and cell area 706.
  • the TCA 702 may be cell areas 706 that are target cells for the WTRU 704 to connect to from the base station 114m.
  • the TCA 702 may include two or more target cells.
  • the TCA 702 may include one or more target cells.
  • the TCA 702 may include a priority for each of the cell areas 706, which may be target cells.
  • the WTRU 102 may include information 720.
  • Information 720 may include the location of the WTRU 102, the speed of the WTRU 102, measurements collected by the WTRU 102, wireless network information such as the location of cells 202, street topology, statistics related to the WTRU 102 past behavior with handovers, such as a number of RLFs and handover failures.
  • the WTRU 102 may be configured to transmit the information 720 to the base station 114m.
  • the base station 114n may include information 740.
  • the base station 114n may store, transmit, retrieve, or receive information 740.
  • Information 740 may include information regarding the WTRU 102 and/or the base station 114n.
  • information 740 may include information included in the target cell list 800 of FIG. 8.
  • Information 740 may include information related to the WTRU 102 such as the location of the WTRU 102, the speed of the WTRU 102, measurements collected by the WTRU 102, wireless network information such as the location of cells 202, street topology, statistics related to the WTRU 102 past behavior with handovers, such as a number of RLFs and handover failures.
  • the base station 114n may be configured to send information 740 to the base station 114m. In some embodiments, the base station 114n may send the information 740 to the base station 114m via the X2 interface.
  • the base station 114n may be configured to determine a target cell area 702 for the WTRU 102. In some embodiments, the base station 114n may determine a TCA 702 for each WTRU 102 that is associated with the base station 114m.
  • the base station 114m may determine the TCA 702 based on one or more of the following: the location of the WTRU 102, the location of cells 202, the location of base stations 114, measurements collected by one or more WTRU 102, measurements collected by the other base stations 114, a street topology, deployment information regarding the wireless network 200, tracking area, success/failure rate of past handovers of the WTRU 102 and/or other WTRUs 102, a predicted trajectory of the WTRU 102, information maintained in the neighbour relation table (NRT), information obtained from neighboring base stations 114m, such as via an X2 interface.
  • NRT neighbour relation table
  • the predicted trajectory of the WTRU 102 may be based on locations of the WTRU 102 and/or based on predicted future locations of the WTRU 102.
  • the base station 114m may predict future locations of the WTRU 102 based on information 720 the WTRU 102 may send to the base station 202 such as a route the user of the WTRU 102 intends to follow that may be from a GPS mapping application and/or the base station 202 may determine a predicted future locations based on other information such as where other WTRUs 102 have traveled after being where the WTRU 102 is.
  • the base station 202 may predict a further location of the WTRU 102 based on information of transportation systems.
  • the base station 202 may have information regarding the roads, trails, and rail ways.
  • the base station 202 may determine that the WTRU 102 is likely on a train or highway and predict a future location based on the geography of the railway or highway and, in some embodiments, on past locations of the WTRU 102.
  • the base station 114 may determine a TCA
  • the base station 114 may determine a TCA 702 for a WTRU 102 based on a speed of the WTRU 102 exceeding a threshold value, or a link quality of the connection between the base station 114 and the WTRU 102 falling below a threshold.
  • the base station 114 may be configured to transmit the TCA 702 periodically to the WTRU 102.
  • the base station 114n may be configured to transmit the TCA 702 to the WTRU 102.
  • FIG. 8 illustrates a candidate target cell list 800 according to some embodiments.
  • the candidate target cell list 800 may include a celllD 802, carrierFreq 804, GeoLocation 806, and CellCoverage 808.
  • the celllD 802 may be an identification of the cell 202 that may be according to one or more standards for wireless networks 200.
  • the carrierFreq 804 may be a frequency used by the cell 202 with celllD 802.
  • the GeoLocation 806 may be a geographic location of the cell 202 with celllD 802.
  • the CellCoverage 808 may be a coverage of the cell 202 with celllD 802.
  • the TCA 702 may be transmitted to the WTRU 102 via the candidate target cell list 800.
  • the candidate target cell list 800 may be transmitted to the WTRU 102 in an information element.
  • the candidate target cell list 800 may be signaled via a handover command such as RRCConnectionReconfiguration which may include the mobilityControlInfo.
  • the base station 114 may be configured to rank the target cells 202 based on information available to the base station 114. For example, the base station 114 may rank the target cells 202 based on how likely the WTRU 102 will be able to successfully handover to the target cell 202.
  • FIG. 9 illustrates a wireless network 900 with a target cell area of bordering cells according to some embodiments. Illustrated in FIG. 9 is a WTRU 102, a predicted trajectory 908 of the WTRUs 102, a primary cell 902, prepared neighbor cells 906, unprepared neighbor cells 904, and cell areas 202.
  • the primary cell 902 may be a base station 114 that the WTRU 102 is currently attached to.
  • the prepared neighbor cells 906 may be cells that are determined to be part of the target cell area (TCA) and may have context of the WTRU 102 sent to them, the unprepared neighbor cells 904 may be cells that are not part of the TCA and that have not had context information regarding the WTRU 102 sent to them.
  • the predicted trajectory 908 may be a predicted motion of the WTRU 102.
  • the primary cell 902 may determine the TCA, which may include the prepared neighbor cells 906.
  • the primary cell 902 may signal the TCA to the WTRU 102.
  • the WTRU 102 may not be able to handover to a cell on the TCA due to the motion of the WTRU 102 illustrated by the motion vector 908.
  • FIG. 10 illustrates a wireless network 1000 with a target cell area of cells of a predicted trajectory 1008 of a WTRU 102 according to some embodiments. Illustrated in FIG. 10 is a WTRU 102, a predicted trajectory 1008 of the WTRUs 102, a primary cell 1002, prepared neighbor cells 1004, unprepared neighbor cells 1006, and cell areas 202.
  • the primary cell 1002 may determine a target cell area (TCA).
  • TCA target cell area
  • the primary cell 1002 may determine a TCA based on the predicted trajectory 1008 of the WTRU 102.
  • the TCA may include the prepared neighbor cells 1004.
  • the primary cell 1002 may determine the TCA and then prepare the cells of the TCA by sending the context information of the WTRU 102 to the cells of the TCA. As illustrated in FIG. 10, the WTRU 102 may receive the TCA from the primary cell 1002. The primary cell 1002 may select one of the neighbor cells 104 for the WTRU 102 to handover to. In some embodiments, the primary cell 1002 may select one of the prepared neighbor cells 1004 to handover to from the primary cell 1002. The handover may have an increased chance of success because the WTRU 102 may be closer to the prepared neighbor cells 1004 due to the TCA being determined based on a predicted trajectory 1008 of the WTRU 102.
  • the WTRU 102 may select another cell from the TCA to handover to. In some embodiments, if the hand over fails, the WTRU 102 may select another cell from the TCA to continue handover or for connection reestablishment. In some embodiments, the TCA may be determined by another base station. In some embodiments, the TCA may be determined by another node of the wireless network 1000 such as a core node of the network.
  • FIG. 11 illustrates a wireless network 1100 with a target cell area of cells based on a predicted trajectory 1108 of a WTRU 102 according to some embodiments. Illustrated in FIG. 11 is a WTRU 102, a predicted trajectory 1108 of the WTRUs 102, a primary cell 1102, prepared neighbor cells 1104, unprepared neighbor cells 1106, and cell areas 202.
  • the WTRU 102 may be moving along a main street in a left trajectory.
  • the primary cell 1102 may determine the predicted trajectory 1108 based on information regarding the streets and the previous movement of the WTRU 102 or a direction of the WTRU 102.
  • the primary cell 1102 may then determine the predicted trajectory 1108.
  • the TCA may be determined based on other known transportation paths such as waterways, bike paths, railroads, fly ways, etc.
  • the primary cell 1102 may determine the target cell area (TCA) based on the predicted trajectory 1108 and/or the information regarding the streets and the previous movement of the WTRU 102. The primary cell 1102 may prioritize the cells within the TCA based on a determined likely hood of the WTRU 102 being able to handover to the cells of the TCA. [0113] The primary cell 1102 may prepare the prepared neighbor cells
  • the primary cell 1102 may send the TCA to the WTRU 102.
  • the primary cell 1102 may send a cell 1104, 1106 for the WTRU 102 to hand over to.
  • the WTRU 102 may attempt to handover to the received cell 1104, 1106. If the WTRU 102 fails to hand over to the received cell 1104, 1106 to handover to, the WTRU 102 may select one of the target cells form the TCA based on how likely a handover to the cell 1104, 1106 is. For example, the WTRU 102 may select a target cell from the TCA based on a geographic proximity. As illustrated in FIG.
  • the WTRU 102 may have an improved chance of handing over to a prepared neighbor cell 1104 because the prepared neighbor cells were selected based on where the WTRU 102 is predicted to be when a handover is needed.
  • the primary cell 1102 may be configured to determine a new TCA if the WTRU 102 varies from the predicted trajectory 1108.
  • FIG. 12 illustrates a wireless network 1200 with a target cell area of cells based on a predicted trajectory 1208 of a WTRU 102 according to some embodiments. Illustrated in FIG. 12 is a WTRU 102, a predicted trajectory 1208 of the WTRUs 102, a primary cell 1202, prepared neighbor cells 1204, unprepared neighbor cells 1206, cell areas 202, explicit target destination 1210, explicit route 1212, and actual high traffic 1214.
  • the explicit target destination 1210 may be determined from a direction generating application.
  • the explicit route 1212 may be determined from a direction generating application.
  • the explicit route 1212 may be turn by turn instructions for a user of the WTRU 102 to follow.
  • the high traffic 1214 may be received by the primary cell 1202 or another node of the wireless network 1200. In some embodiments, a node of the wireless network 1200 may determine the actual high traffic 1214.
  • the primary cell 1202 may determine the predicted trajectory 1208 based on directions representing the explicit route 1212.
  • the WTRU 102 may send the explicit route 1212 to the primary cell 1202 or to anther node of the wireless network 1200.
  • the primary cell 1202 may determine the target cell area (TCA) based on the predicted trajectory 1208.
  • TCA target cell area
  • the primary cell 1202 may determine the TCA based on the explicit route 1212. For example, the primary cell 1202 may receive a next turn instruction and select target cells based on an area or proximity of target cells to the next turn.
  • a network entity of the wireless network 1200 may maintain the explicit route 1212 of the WTRU 102 and send a TCA to the primary cell 1202 and/or a predicted trajectory 1208.
  • the WTRU 102 may update the primary cell 1202 and/or the network entity with new explicit routes 1212 or deviations from the explicit route 1212.
  • the WTRU 102 may be configured to select for measuring and handing over one or more prepared neighbor cells 1204 based on information contained in the TCA, which may be sent in a CandidateTargetCellList IE, and based on information related to the WTRU 102 such as the location and speed of the WTRU 102 as well as wireless network preferences.
  • the information regarding the prepared neighbor cells 1204 may include the geo-location of the different prepared neighbor cells 1204 as well as their cell coverage.
  • the primary cell 1202 may select the target cell based on the explicit target destination 1210.
  • FIG. 13 illustrates an example of a WTRU and a base station signaling regarding an explicit route.
  • the call flow may begin with the RRM/RRC 1304 requesting 1312 a GPS application 1302 for explicit route information if available.
  • the base station 1308 may request the explicit route information from the WTRU 102.
  • the GPS application 1302 may determine a route 1310.
  • the explicit route may be sent to the RRM/RRC 1304 at 1314.
  • the RRM/RRC 1304 may send the explicit route to the stack 1306 at 1324.
  • the explicit route 1316 may be transmitted to the base station 1308 at 1316.
  • the base station 1308 may determine a TCA 1320.
  • the base station 1308 may determine a TCA 1320.
  • the 1308 may transmit the TCA to the stack 1306 at 1318.
  • the stack 1306 may send the TCA to the RRM/RRC 1304.
  • the base station 1308 may send a cell from the TCA to hand over to. If the WTRU 102 fails to handover to the cell received from the base station 1308 to hand over to, the WTRU 102 may use the TCA to select a target cell and update its measurements and mobility at 1322.
  • the base station 1308 does not compute the TCA, but the TCA is computed by a network entity.
  • FIG. 14 illustrates an example of mobility reporting and proactive base station preparation according to some embodiments.
  • the flow may being with the WTRU 102 transmitting a UEMobility information 1402 to the primary base station 1404.
  • the UEMobility information 1402 may be a category or scalar number, such as low, medium, high, or 20 km/hour.
  • the primary base station 1404 may determine whether or not to prepare target base stations at 1406. On a condition that the primary base station 1404 determines to prepare a target base station 1410, the primary base station 1404 transmits a proactivepreparationrequest 1408 to the target base station 1410.
  • the proactivepreparationrequest 1408 may include information regarding the WTRU 102 that may lessen the time needed for the WTRU 102 to attach to the target base station 1410. On a condition that the primary base station 1404 determines to prepare one or more target base stations 1410, the primary base station 1404 may prepare one or more target base stations 1410.
  • FIG. 15 is an example of an enhanced handover according to some disclosed embodiments.
  • the flow may begin with the WTRU 102 and the source cell/eNB 1502 signaling data transfer 1508.
  • the flow may continue with a handover decision being made by the source cell/eNB 1502 at 1510.
  • the flow may continue with a handover request being made to the target cell/eNB #1 1504 at 1512.
  • the flow may continue with the target cell eNB #1 signaling a handover request acknowledge 1514.
  • the flow may continue with
  • RRCConnectionReconfiguration being signaled from the source cell/eNB 1502 to the WTRU 102.
  • the flow may continue with the source cell/eNB 1502 signaling SN status transfer 1518 to the target Cell/eNB #1 1504.
  • the flow may continue with the source cell/eNB 1502 data forwarding 1520.
  • the flow may continue with the WTRU 102 signaling RACH 1522 to the target cell/eNB #1 1504 at 1522.
  • T304 expiry at 1524. A timer T304 may expire.
  • the WTRU 102 may determine by the expiration of the timer T304 that a handover to target cell/eNB #1 1504 may fail and/or that the WTRU 102 should determine another target cell from the TCA to attempt to handover to.
  • the flow continues with the WTRU 102 signaling the target cell/eNB #2 with RACH 1526.
  • the WTRU 102 may have selected the target cell/eNB #2 from the TCA.
  • the flow may continue with the target cell/eNB #2 responding with RACH response 1528.
  • the flow may continue with the target cell/eNB #2 signaling context request 1530.
  • the target cell/eNB #2 may request a context of the WTRU from the target cell/eNB #1.
  • the flow may continue with the source cell/eNB 1502 responding with context request acknowledge 1532.
  • the flow may continue with the source cell/eNB 1502 signaling SN status transfer 1534.
  • the flow may continue with the source cell/eNB signaling data forwarding 1536.
  • the flow may continue with the WTRU 102 signaling to the target cell/eNB #2 RRCConnectionReconfigurationComplete 1538.
  • the flow may continue with data transfer 1540 between the WTRU 102 and the target Cell/eNB #2 1506.
  • the 1524 may be conditioned on whether or not the WTRU 102 received the TCA, which may be sent in a CandidateTargetCellList IE.
  • the WTRU 102 may determine whether or not to perform enhanced handover procedure of responding to T304 expiry based on a mobility state of the WTRU 102, services provided to the WTRU 102, load on the macro cell, etc.
  • the WTRU 102 may set timer T304 upon reception of the RRCConnectionReconfiguration message at 1516 with mobilityControlInfo, which may be a handover command. If the HO does not complete successfully before expiration of the timer, the HO is considered to have failed. To reduce the probability of the WTRU 102 moving out of the coverage range of the source cell/eNB 1502 before the timer expires, the value of timer T304 can be optionally scaled using a speed- dependent scale factor such as the sf-Medium or sf-High scale factors signaled via the MeasConfig IE.
  • a speed- dependent scale factor such as the sf-Medium or sf-High scale factors signaled via the MeasConfig IE.
  • the legacy HO procedure Upon T304 expiry without enchanced handover, the legacy HO procedure would commence with the RRC Connection Re-Establishment procedure.
  • the enhanced procedure may allow the WTRU 102 to attempt to complete the HO with another the target cell/eNB #2 1506 from the list of candidate target cells. This procedure can continue until HO completion with all cells in the list of candidate target cells has been attempted. For example, the timer T304 may have been reset at RACH 1526. If T304 expiry had occurred, then the WTRU 102 may have selected another target Cell/eNB from the list of candidate target cells and attempted to handover to the new target cell.
  • FIG. 16 is an example of an enhanced handover according to some disclosed embodiments.
  • the flow may begin with the WTRU 102 and the source cell/eNB 1602 signaling data transfer 1612.
  • the flow may continue with a handover decision being made by the source cell/eNB 1604 at 1614.
  • the flow may continue with a handover request being made to the target cell/eNB #1 1606 at 1616.
  • the flow may continue with the target cell eNB #1 signaling a handover request acknowledge 1618.
  • the flow may continue with
  • the timer T3xx may be started upon reception of the RRCConnectionReconfiguration 1620.
  • the flow may continue with the source cell/eNB 1604 signaling SN status transfer 1622 to the target Cell eNB #1 1606.
  • the flow may continue with the source cell/eNB 1604 signaling data forwarding 1624.
  • the flow may continue with the WTRU 102 signaling RACH 1626 to the target cell/eNB #1 1606 at 1626.
  • the WTRU 102 may set timer T304 upon reception of RRCConnectionReconfiguration 1620.
  • the flow may continue with T304 expiry at 1628.
  • a timer T304 may expire.
  • the WTRU 102 may determine by the expiration of the timer T304 that a handover to target cell/eNB #1 1604 may fail and/or that the WTRU 102 should determine another target cell from the TCA to attempt to handover to.
  • the flow continues with the WTRU 102 signaling the target cell/eNB #2 1608 with RACH 1630.
  • the flow may continue with the T3xx expiry 1632.
  • the WTRU 102 may determine that the amount of time to try to handover has exceeded a threshold and that it should commence the RRC Connection Re- Establishment procedures with target cell/eNB #3 1610.
  • the WTRU 102 may use a new counter to limit the number of reestablishment attempts.
  • the WTRU 102 may attempt to re-establish connection with source cell/eNB 1604.
  • the flow may continue with 1634, 1636, 1638, 1640, and 1642, which may be a RRC Connection re-establishment procedure according to one or more standard methods of RRC Connnection re-establishment.
  • the flow may continue with data transfer 1644 between the WTRU 102 and target cell/eNB #3 1610.
  • FIG. 17 is an example of an enhanced RRC connection re- establishment method 1700 according to some disclosed embodiments.
  • the WTRU 102 may have been connected to cell 1 1704, which may be a small cell.
  • the WTRU 102 may be attempting to re-establish the connection between the WTRU 102 and cell 1 1704 after a RLF or HO failure.
  • the flow may begin with the WTRU 102 signaling
  • the WTRU 102 may determine whether or not to perform the enhanced RRC connection reestablish.
  • the WTRU 102 may determine whether or not to perform the enhanced RRC connection re-establishment based on any of the following: a mobility of the WTRU 102, service provided to the WTRU 102, load on a macro cell, the presence or absence of the CandidateTargetCellLis IE (or TCA), etc. For example, the WTRU 102 may need a service provided by a small cell and so enter the enhanced RRC connection re-establishment to attempt to connect to a small cell.
  • the WTRU 102 may determine not to enter the enhanced RRC connection re-establishment if the WTRU 102 is highly mobile and determines that it is unlikely that the WTRU 102 will be able to re-establish a connection with a small cell. On the condition that the WTRU 102 determines not to perform the enhanced an RRC connection re-establishment, then the WTRU 102 may enter the RRCJDLE mode.
  • the WTRU may set timer T301 upon transmission of the
  • timer T301 can be optionally scaled using a speed- dependent scale factor; such as the sf-Medium or sf-High scale factors signaled via the MeasConfig IE.
  • the flow continues with T301 expiry 1710.
  • the WTRU 102 may determine that the re-establishment has failed if no response is received from cell 1 1704 when the T301 expiry occurs.
  • the flow may continue with RRCConnectionRestablishmentRequest 1712.
  • the WTRU 102 may be configured to determine another cell to attempt to reestablish a connection with.
  • the WTRU 102 may select cells from the TCA.
  • the WTRU 102 may determine to select a macro cell.
  • RRCConnectionRestablishment 1714 The flow may continue with the WTRU 102 transmitting RRCConnectionReestablishmentComplete 1716. If cell 2 1706 had not responded with RRCConnectionReestablishment 1714, then the WTRU 102 may have selected another cell to attempt to reconnect with from the TCA.
  • FIG. 18 is an example of an enhanced RRC connection re- establishment method 1800 according to some disclosed embodiments.
  • the WTRU 102 may have been connected to cell 1 1802, which may be a small cell.
  • the WTRU 102 may be attempting to re-establish the connection between the WTRU 102 and cell 1 1802 after a RLF or HO failure.
  • the method 1800 may begin with the WTRU 102 signaling
  • the WTRU 102 may be in an RRC connected mode 1808.
  • the WTRU 102 may determine whether or not to perform the enhanced RRC connection re-establish. [0139]
  • the WTRU 102 may set timer T301 upon transmission of the
  • the method 1800 continues with T301 expiry 1814.
  • the WTRU 102 may determine that the re-establishment has failed if no response is received from cell 1 1802 when the T301 expiry occurs.
  • the method 1800 may continue with RRCConnectionRestablishmentRequest 1816.
  • the WTRU 102 may be configured to determine another cell to attempt to reestablish a connection with.
  • the WTRU 102 may select cells from the TCA.
  • the method 1800 may continue with cell 2 1804 transmitting
  • the WTRU 102 may be configured to determine another cell to attempt to reestablish a connection with.
  • the WTRU 102 may select cells from the TCA.
  • the method 1800 continues with T3xx expiry 1820.
  • the WTRU 102 may then enter into RRCJDLE 1810.
  • the flow may continue with 1822, 1824, and 1826 which may be according to one or more standards upon the WTRU 102 leaving RRC_CONNECTED.
  • the WTRU 102 may select cell 3 1806 based on the TCA, or a macro cell, or based on receiving information regarding cell 3 1806 from beacon or information signals.
  • FIG. 19 illustrates an example of a method 1900 of enhanced RRC connection re-establishment with an unprepared base station according to some embodiments.
  • the method 1900 begins with the WTRU 102 being associated with a serving-eNB 1904.
  • the method 1900 continues with a WTRU 102 detecting an RLF 1910.
  • the method 1900 continues with the WTRU 102 making a cell selection 1912 meeting a serving cell criterion.
  • the method 1900 continues with a RACH procedure 1914 between the WTRU 102 and the Nb-eNB 1902.
  • the method 1900 continues with the WTRU 102 transmitting an RRCConnectionReestablishment Request (Serving-eNB ID) 1916 to the Nb-eNB 1902.
  • RRCConnectionReestablishment Request Server-eNB ID
  • the Nb-eNB 1902 may not find a context for the WTRU 102 so that the Nb-eNB 1902 may be unprepared for the WTRU 102.
  • the method 1900 may continue with the Nb-eNB 1902 sending an X2AP: reset-HO required 1918 via the X2 interface to the server-eNB 1904.
  • the Nb-eNB 1902 may be configured to request from a serving-eNB 1904 a handover request from the server-eNB 1904 so that the Nb-eNB 1902 can complete a handover with the WTRU 102.
  • the method 1900 continues with the serving-eNB 1904 sending a handover request 1920 to the Nb-eNB 1902.
  • the Nb-eNB 1902 may now have the context of the WTRU 102.
  • the method 1900 may continue with admission control 1922.
  • the method 1900 may continue with handover request Ack 1924.
  • the method 1900 may continue with RRCConnectionReestablishment 1926.
  • the Nb-eNB 1902 may now reestablish a connection with the WTRU 102 since the Nb-eNB 1902 has received the context of the WTRU 102 from the serving-eNB 1904.
  • the method 1900 may continue with SN status transfer 1928.
  • the method 1900 may continue with forward user data 1930.
  • the method 1900 may continue with RRCConnectionRestablishment complete 1932.
  • the WTRU 102 may complete reestablishment since the Nb-eNB 1902 requested the context of the WTRU 102 from the serving-eNB 1904.
  • the method 1900 may continue with user packet data DL/UL 1934.
  • the method 1900 may continue with path switch request 1936.
  • the method 1900 may continue with modify bearer request 1938.
  • the SGW 1908 may now switch DL path 1940.
  • the method 1900 may continue with modify bearer response 1942.
  • the method 1900 may continue with path switch request acknowledgement 1944.
  • the method 1900 may continue with context release 1946.
  • the method 1900 may continue with release resource 1948.
  • the unprepared base station may obtain the WTRU 102 context by sending a reset-HO required to a serving base station.
  • FIG. 20 illustrates an example of a method 2000 of enhanced RRC connection re-establishment with an unprepared base station according to some embodiments.
  • the method 2000 begins with the WTRU 102 being associated with a serving-eNB (not illustrated).
  • the method 2000 may continue with the WTRU 102 transmitting RRCConnectionReestablishmentRequest 2006.
  • the cell/eNB 1 2002 may not have a context for the WTRU 102.
  • the cell/eNB 1 2002 may be configured to determine a base station that does have the context of the WTRU 102 and to send the identification of the base station with the context of the WTRU 102 to the WTRU 102 for the WTRU 102 to re-establish an RRC connection with.
  • the WTRU 102 may be configured to receive the RRCConnectionReestablishmentReject (with UE redirection information) and to then try to reestablish RRC connection with the UE redirection information received.
  • the method 2000 continues with
  • RRCConnectionReestablishmentRequest 2010 may continue with the Cell/eNB 2 2004 with the WTRU 102 context transmitting RRCConnectionReestablishment 2012.
  • the method 2000 may continue with the WTRU 102 transmitting RRCConnectionReestablsihementComplete 2014.
  • a WTRU 102 may be re-directed by a base station without the context of the WTRU 102 to a base station with the context of the WTRU 102.
  • FIG. 21 illustrates an example of a method 2100 of RRC connection re-establishment with a macro cell layer according to some disclosed embodiments.
  • the source Cell/eNB 2102 may be a small cell.
  • the macro cell/eNB 2104 may be a macro cell.
  • the method 2100 may begin with data transfer 2106 between the WTRU 102 and the source cell/eNB 2102.
  • the method 2100 may continue with the WTRU 102 transmitting UEMobilitylnfo 2108 to the source cell eNB 2102.
  • the UEMobilitylnfo 2108 may include information related to the mobility of the WTRU 102 such as a mobility state of the WTRU 102, which may include stationary, low mobility, medium mobility, and high mobility.
  • the method 2100 may continue with the source cell/eNB 2102 determining a handover preparation decision 2110.
  • the source cell/eNB 2102 may be configured to determine whether or not to prepare a macro cell/eNB 2104 for handover of the WTRU 102. The determination may be based on the UEMobilitylnfo 2108 as well as other information related to whether or not the WTRU 102 may be served by handing off to a macro cell/eNB 2104 rather than another small cell.
  • the method 2100 continues with the source cell/eNB 2102 determining to prepare the macro cell/eNB 2104 for handing over the WTRU 102. On the condition that the source cell/eNB 2102 determines not to prepare the macro cell/eNB 2104 for handing over then the method may end.
  • the method 2100 continues with the source cell eNB 2102 sending proactive preparation 2112 to the macro cell/eNB 2104.
  • the method 2100 continues with the macro cell/eNB 2104 sending proactive preparation acknowledgement 2114.
  • the macro cell/eNB 2104 may be prepared for handing over the WTRU 102.
  • the method 2100 may continue with RLF/HO failure 2116.
  • WTRU 102 may experience a RLF/HO failure with the source cell/eNB 2102.
  • the WTRU 102 may determine to reestablish RRC connection with the macro cell/eNB 2104 rather than the source cell/eNB 2102.
  • the method 2100 may continue with RRCConnectionReestablishmentRequest 2118.
  • the method 2100 may continue with RRCConnectionReestablishment 2120.
  • the macro cell/eNB 2104 may be able to reestablish RRC connection with the WTRU 102 because the source cell/eNB 2102 proactively prepared the macro cell/eNB 2104.
  • the method 2100 may continue with RRCConnectionReestablishmentComplete 2122.
  • the method 2100 may continue with RRCConnectionReconfiguration 2124.
  • the macro cell/eNB 2104 may need to reconfigure the RRC connection according to the macro cell/eNB 2104.
  • the method 2100 may continue with RRCConnectionReconfigurationComplete 2126.
  • the method 2100 may continue with data transfer 2128.
  • the WTRU 102 was able to reestablish RRC connection with the macro cell.
  • the WTRU 102 may attempt to reestablish RRC connection with one or more small cells prior to attempting to reestablish RRC connection with a macro cell.
  • the one or more small cells may be selected from the candidateTargetCellList IE or TCA.
  • the candidatetargetcelllist may include a priority order which the WTRU 102 uses to select the small cell.
  • FIG. 22 illustrates an example of an automatic neighbor relation
  • ANR Adreliable and Mobile communications
  • the base station 2202 may be a eNobeB.
  • the base station 2202 may include ANR function 2204 and neighbor relation table 2206.
  • the neighbor relation table 2206 may maintain neighbors of a WTRU 102 and/or neighbors of the base station 2202.
  • the ANR function 2204 may be configured to manage the neighbor relation table 2206.
  • the neighbor detection function 2224 may be configured to find new neighbors and add them to the NRT 2206.
  • Neighbor removal function 2220 may be configured to remove outdated neighbor relations (NR) 2226.
  • the ANR function 2204 may be configured to use information from cells broadcasting their identity on a global level, such as E-UTRAN Cell Global Identifier (ECGI).
  • the base station 2202 may be configured to instruct the WTRU 102 as part of a normal call procedure to perform measurements on neighbor cells.
  • the base station 2202 may use different policies for instructing the WTRU 102 to do measurements, and when to report them to the base station 2202.
  • ECGI info reported by the WTRU 102 may be processed by the ANR function 2204 and used to update the NRT 2206.
  • the neighbor blacklist function 2208 may be configured to blacklist cells of non-preferred networks for WTRU 102 to prevent HO to an "unsuitable" cell for the WTRU 102.
  • the NRT 2206 may include an attribute for NR 2226 of whether or not the NR 2226 is blacklisted.
  • the base station 2202 may signal the blacklisted cells to the WTRU 102 as part of the measurement configuration. For example, referring back to FIG. 2, base station 114c may be from a first public land mobile network (PLMN), and base station 114h may be from a second PLMN. The second PLMN may not permit roaming from WTRUs 102 of the first PLMN. Cell 202h may then be black listed for WTRU 102.
  • PLMN public land mobile network
  • the physical cell identifiers (PCI) of base stations 2202 and channel of operation may change infrequently.
  • the blacklisted cells 2210 may be configured on a semi-static basis via the O&M interface 2240.
  • the PCI may change more frequently and the base station 2202 may be reconfigured more frequently.
  • the blacklist associated with the NRT 2206 may be used.
  • an existing attribute of the NRT 2206 such as No HO may be used to indicate blacklisted cells.
  • PCI filtering may be used.
  • the source base station 114c may request the WTRU 102 perform system information (SI) acquisition and reporting for neighbor cells, prior to issuing a HO command.
  • SI system information
  • the source base station 114c may then filter out the PCIs corresponding to unsuitable cells 202 such as cells from different PLNM that do not permit roaming.
  • PCI filtering can be accomplished at the source base station 114c by setting the No HO field in the NRT 2206 for cells 202 that are unsuitable for HO.
  • the source base station 114c may proactively configure SI reporting, to reduce latency in triggering a HO.
  • the WTRU 102 may autonomously read the
  • the WTRU 102 may filter measurements such that the reports would only include measurements for suitable cells 202 such as cells with ECGIs that correspond to the selected PLMN or an equivalent PLMN of the WTRU 102.
  • the WTRU 102 may maintain a location-dependent history of PCIs corresponding to suitable cells 202 and report the suitable cells 202 to the base station 114c, and, in some embodiments, report the suitable cells 202 to the base station 114c without performing measurements.
  • FIG. 23 illustrates an example of a simulation test bed layout 2300 used to generate disclosed simulation results.
  • An OPNET® simulation test bed layout 2300 was used to simulate the WTRU 2304 mobility operations within small cells. Illustrated in FIG. 23 is a simulation example test bed layout 2300.
  • the example test bed layout includes, cells 2308 with a cell size of 100m in radius, WTRU 2304 is moving with random direction at 60km/h 2302 within the rectangle which is composed of 16 overlapped cells 2308 each having one base station 2306.
  • FIG. 24 illustrates a table of settings 2400 for the simulation test bed layout 2300 used in FIG. 23.
  • a new carrier type may be used for enhanced connection mobility control for new or modified information elements.
  • the base stations and WTRU may use information elements added to NCT to exchange information.
  • Different signaling types may be used. For example, system information blocks (SIB), dedicated signaling, and/or inclusion in the master information block (MIB), may be used.
  • SIB system information blocks
  • MIB master information block
  • information elements for enhanced mobility may be used through SIB broadcasting.
  • the serving base station may periodically broadcast through SIBs.
  • the serving base station may be configured to use new broadcasting.
  • the serving base station may be configured to broadcast the information elements for enhanced connection mobility control.
  • the WTRU may be able to acquire the information elements more quickly or more frequently.
  • the following information for enhanced connection mobility control may be included in one more or more new information elements.
  • a cell type that indicates if the base station is one of the following: small cell, macro cell, Femto cell, indoor cell, or outdoor cell.
  • the WTRU may be configured to use the cell type to select a new cell during HO or reselection procedure. For example, an outdoor WTRU may determine to not consider indoor cells or femto cells as a new cell.
  • a cell geo-location may be included in one or more new or modified information elements.
  • the WTRU may use the geo-location for enhanced mobility connection mobility and measurement procedures as described herein.
  • a cell geo-location range may be used in one more new or modified information elements.
  • the cell geo-location may be used for mobility and measurement procedure as described herein.
  • a small cell operation rules may be used in one or more new or modified information elements.
  • the small cell operation rules may include the scaling factors and their related thresholds as described herein.
  • a cell's island information which may include a cell's island identification and common cell configuration may be used in one or more new or modified information elements.
  • a radio access network (RAN) provider identification may be used in one or more new or modified information elements.
  • the RAN provider identification may include infrastructure provider identification.
  • a WTRU may use this information in its selection of a new cell when HO or cell reselection as disclosed herein.
  • the serving base station may broadcast, through system information blocks (SIBs), the neighbor cells' information regarding enhanced mobility.
  • SIBs system information blocks
  • the information may include all or part of the above listed information.
  • the WTRU may use this information in selecting candidate cells to start measuring and ranking for the HO and cell reselection procedures.
  • the neighbor cell information may also include cell configuration.
  • the cell configuration information may include carrier information which may include center frequency and carrier bandwidth.
  • the WTRU may use this information, in the context of non-static bandwidth of the carriers, to synchronize and access the carrier.
  • the cell configuration information may include carrier type which may refer to the operation in that carrier including fully reserved for cellular operation, licensed shared carrier operation (LTE/LTE, LTE/WIFI%), and open to all users operation.
  • the WTRU may use this information, with respect to its own capabilities, to select the candidate cells for mobility procedures. For example, a WTRU that does not have a capability to operate on a carrier may have a second operating WIFI system, so it may not select the cell operating in LTE/WIFI licensed shared carrier or an open to all users carrier.
  • the cell configuration information may include cell configuration including cell specific RACH information to speedup mobility procedure to the cell, allowable UE maximum transmit power, UE power mask, and Actual Access channel information, which may include Listen before talk mechanism, CSMA WiFi like mechanism, and silent period configuration.
  • a cell's configuration which may include frequency and cell geo-location range, may change dynamically.
  • the base station may send the changed cell configuration of the base station to all its neighbor base stations. Every neighbor base station receiving that updated configuration may dynamically update the corresponding SIB broadcast. Alternatively, every neighbor base station receiving that received the updated configuration may form a SIB including only the newly updated information. The base station may then only broadcast an SIB including updated information to WTRUs.
  • the information elements for enhanced mobility may be sent to a
  • the base station may be configured to use dedicated signaling to send to a WTRU that just handed over to the base station one or more of the following: the geo-location range, the small cell operation rules, neighbor cell's information in order for the WTRU in high speed to start measuring and ranking for the purpose of HO procedure.
  • the base station may use dedicated signaling to send one or more of the following WTRU specific information.
  • a WTRU dedicated TCA may be used for a specific WTRU for its mobility procedures as disclosed herein.
  • a WTRU dedicated RAN Providers Identification list representing the identification of infrastructure providers that are allowed for a specific WTRU to connect to. The list may depend on the UE user profile such as its monthly plan.
  • a WTRU dedicated small cell operation rules that may include the scaling factors and their related thresholds and can be used by a WTRU for its mobility procedures as disclosed herein.
  • cells configuration which may include frequency and/or cell geo-location range, may change dynamically.
  • the base station may be configured to send the cell configuration of base station to the neighbors of the base stations on a condition that the cell configuration changes.
  • Neighbor base stations receiving that updated configuration may send a dedicated signal to WTRUs to notify the WTRUs of the updated configuration.
  • the base station may send dedicated signals to a WTRU based on one or more of the following conditions: the time for the cell to broadcast the updated information is longer than a threshold time, the WTRU is in high mobility toward the cell that has updated its configuration, and the WTRU is approaching the cell range with a certain threshold distance toward the cell that has updated its configuration.
  • the base station may include enhanced cell information in an MIB, which may enable a highly mobile WTRU to acquire the information.
  • the enhanced cell information may include one or more of the following: cell identification, network identification (PLMN), cell type, and RAN provider identification.
  • the information for enhanced mobility disclosed herein may be in separate fields in the MIB or combined and coded into one or more joint fields.
  • the WTRU may use the MIB information in its mobility procedure.
  • the information for enhanced mobility may be used only for small cells.
  • connection mobility control Various numbered embodiments are provided below for connection mobility control.
  • Embodiment 1 A method of connection mobility control CMC, the method comprising: determining location information of a wireless transmit/receive unit WTRU; determining a target cell area TCA for the WTRU based on the location information of the WTRU, wherein the TCA comprises one or more target cells; and transmitting the TCA to the WTRU.
  • Embodiment 2 The method of embodiment 1, further comprising: receiving a request from a target cell of the TCA for a context of the WTRU, wherein the target cell received a RACH message from the WTRU.
  • Embodiment 3. The method of any of embodiments 1 or 2, wherein the determining the location information comprises receiving the location information of the WTRU from the WTRU and determining the location of the WTRU at least based on the received location information.
  • Embodiment 4 The method of any of embodiments 1-3, wherein the received location includes a projected trajectory of the WTRU.
  • Embodiment 5 The method of any of embodiments 1-4, wherein the determining the location information comprises determining the location information of the WTRU based at least on a measurement report from the
  • the measurement report includes one or more measurements of cells.
  • Embodiment 6 The method of any of embodiments 1-5, further comprising determining a projected trajectory of the WTRU.
  • Embodiment 7 The method of any of embodiments 1-6, wherein at least one of the one or more target cells is a small cell network.
  • Embodiment 8 The method of any of embodiments 1-7, wherein a spectrum used by at least one of the one or more target cells is a dynamic shared spectrum DSS.
  • Embodiment 9 The method of any of embodiments 1-8, wherein the TCA is determined without use of measurements of the one or more target cells taken from the WTRU.
  • Embodiment 10 The method of any of embodiments 1-9, further comprising selecting a target cell from the TCA and providing the selected target cell with the context of the WTRU.
  • Embodiment 11 The method of any of embodiments 1-10, further comprising: transmitting the TCA to the WTRU; and transmitting to each of the one or more target cells a context of the WTRU.
  • Embodiment 12 The method of any of embodiments 1-11, further comprising: receiving a speed of the WTRU, and wherein determining further comprises determining the TCA based on the speed of the WTRU.
  • Embodiment 13 The method of any of embodiments 1-12, further comprising: transmitting the TCA to the WTRU; and receiving a measurement report from the WTRU, wherein the measurement report includes measurements of one or more of the one or more target cells of the TCA.
  • Embodiment 14 The method of any of embodiments 1-13, wherein the determining the target cell area TCA further comprises: on a condition of an event, determining the TCA for the WTRU based on the location information of the WTRU, wherein the event is at least one of: a change in a mobility of the WTRU or the WTRU associating with a small cell, and wherein transmitting the TCA further comprises: on the condition of the event, transmitting the TCA to the WTRU.
  • Embodiment 15 The method of any of embodiments 1-14, wherein the determining the location information further comprises: determining the location information of the WTRU and an explicit route of the WTRU; and wherein the determining the TCA further comprises: determining the TCA based on the received explicit route of the WTRU.
  • Embodiment 16 The method of any of embodiments 1-14, further comprising: receiving mobility information from the WTRU; and wherein the determining the TCA further comprises: on a condition that the mobility information indicates the that WTRU is mobile, determining the TCA based on the received mobility, wherein the mobility information indicates whether or not the WTRU is mobile.
  • Embodiment 17 The method of Embodiment 1, wherein the method is carried out on at least one of a eNodeB, base station, a network device, or a wireless transmit and receive unit, a base transceiver station (BTS), a Home Node B, a Home eNode B, a site controller, an access point (AP), or a wireless router.
  • BTS base transceiver station
  • AP access point
  • Embodiment 18 A base station configured to implement the method as in any one of embodiments 1-17.
  • Embodiment 19 A method on a wireless transmit/receive unit, WTRU, of connection mobility control CMC, the method comprising: receiving a target cell area, TCA, from a base station, wherein the TCA comprises one or more target cells; and in response to a radio link failure (RLF) or handover failure, selecting a target cell from the TCA, and transmitting a connection reestablishment request to the selected target cell.
  • WTRU wireless transmit/receive unit
  • Embodiment 20 The method of embodiment 19, further comprising: on a condition of not receiving a connection reestablishment from the selected target cell, selecting another target cell from the TCA, and transmitting a connection reestablishment request to the another target cell.
  • Embodiment 21 The method of embodiment 19 or 20, wherein the selecting further comprises: on the condition of not receiving a connection reestablishment from the selected target cell, transmitting a connection request to a macro cell.
  • Embodiment 22 The method of any of embodiments 19-21, wherein the macro cell received a context of the WTRU based on the WTRU sending measurements to the base station.
  • Embodiment 23 The method of any of embodiments 19-22, wherein the selecting further comprises: selecting the target cell from the TCA based on a projected trajectory of the WTRU.
  • Embodiment 24 The method of any of embodiments 19-23, wherein at least one of the one or more target cells is a small cell network.
  • Embodiment 25 The method of any of embodiments 19-24, further comprising: measuring reception strength of one or more cells based on a measurement interval, wherein the measure interval is adjusted according to a scaling factor indicative of a mobility of the WTRU.
  • Embodiment 26 A device for connection mobility control CMC, the device comprising: a processor configured to determine location information of a wireless transmit/receive unit WTRU, and determine a target cell area TCA for the WTRU based on the location information of the WTRU, wherein the TCA comprises one or more target cells; a transmitter configured to transmit the TCA to the WTRU.
  • a processor configured to determine location information of a wireless transmit/receive unit WTRU, and determine a target cell area TCA for the WTRU based on the location information of the WTRU, wherein the TCA comprises one or more target cells; a transmitter configured to transmit the TCA to the WTRU.
  • a device for connection mobility control CMC comprising: a receiver configured to receive a location information of a wireless transmit and receive unit, WTRU; a processor configured to determine a target cell area TCA for the WTRU based on the location information of the WTRU, wherein the TCA comprises one or more target cells; a transmitter configured to transmit the TCA to the WTRU.
  • Embodiment 28 The device of embodiments 26 or 27, wherein the device is one of: a eNodeB, base station, a network device, or a wireless transmit and receive unit, a base transceiver station (BTS), a Home Node B, a Home eNode B, a site controller, an access point (AP), or a wireless router.
  • BTS base transceiver station
  • AP access point
  • Examples of computer- readable storage media include, but are not limited to, a read only memory (ROM), a random access memory (RAM), a register, cache memory, semiconductor memory devices, magnetic media such as internal hard disks and removable disks, magneto-optical media, and optical media such as CD-ROM disks, and digital versatile disks (DVDs).
  • ROM read only memory
  • RAM random access memory
  • register cache memory
  • semiconductor memory devices magnetic media such as internal hard disks and removable disks, magneto-optical media, and optical media such as CD-ROM disks, and digital versatile disks (DVDs).
  • a processor in association with software may be used to implement a radio frequency transceiver for use in a WTRU, UE, terminal, base station, RNC, or any host computer.

Landscapes

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

Abstract

L'invention porte sur un procédé de fonctionnement d'un appareil pour améliorer la commande de mobilité de connexion pour des réseaux à petites cellules, qui peut consister à recevoir des informations de localisation d'une unité d'émission/réception sans fil (WTRU). Selon certains modes de réalisation, le procédé peut consister à déterminer les informations de localisation de la WTRU. Le procédé peut consister à déterminer une zone de cellules cibles (TCA) pour la WTRU sur la base des informations de localisation de la WTRU. La TCA comprend une ou plusieurs cellules cibles. Le procédé peut consister en outre à transmettre au moins une cellule cible à la WTRU. Un procédé sur une WTRU peut consister à recevoir une zone de cellules cibles (TCA) en provenance d'une station de base. La TCA peut comprendre une ou plusieurs cellules cibles. Le procédé peut consister à répondre à une défaillance de liaison radio (RLF) ou à un échec de transfert intercellulaire par sélection d'une cellule cible dans la TCA, et transmission d'une requête de rétablissement de connexion à la cellule cible sélectionnée. Détails supplémentaires : la BTS de desserte calcule une liste de cellules cibles candidates (TCA, principalement un NCL ou un sous-ensemble de celui-ci) sur la base d'une multitude de critères tels que la topologies des rues, l'historique d'échecs HO précédents ou de la vitesse de BTS de la TCA, conjointement avec les contexte de l'UE, via l'interface X2 (en les préparant ainsi pour HO). La priorité des BTS est établie en fonction de la probabilité de l'occurence de HO. En cas d'échec de HO (p.ex., expiration T304), l'UE utilise un second RACH vers la cellule cible candidate qui peut être préparée ou non préparée. Si une cellule non préparée reçoit un RACH de l'UE, elle renvoie un transfert de rénitialisation à la cellule desservie.
PCT/US2013/072833 2012-12-03 2013-12-03 Commande de mobilité de connexion améliorée pour réseaux à petites cellules Ceased WO2014089051A1 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
US201261732806P 2012-12-03 2012-12-03
US61/732,806 2012-12-03

Publications (1)

Publication Number Publication Date
WO2014089051A1 true WO2014089051A1 (fr) 2014-06-12

Family

ID=49887231

Family Applications (1)

Application Number Title Priority Date Filing Date
PCT/US2013/072833 Ceased WO2014089051A1 (fr) 2012-12-03 2013-12-03 Commande de mobilité de connexion améliorée pour réseaux à petites cellules

Country Status (1)

Country Link
WO (1) WO2014089051A1 (fr)

Cited By (20)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US9265086B2 (en) 2013-10-10 2016-02-16 Qualcomm Incorporated Addressing radio link failures in wireless communication systems
WO2016082940A1 (fr) * 2014-11-24 2016-06-02 Telefonaktiebolaget Lm Ericsson (Publ) Procédé et nœud de réseau pour la prise en charge d'opérations de transfert
WO2016119876A1 (fr) * 2015-01-30 2016-08-04 Telefonaktiebolaget Lm Ericsson (Publ) Transfert dans un scenario à grande vitesse
WO2016209553A1 (fr) * 2015-06-25 2016-12-29 Qualcomm Incorporated Préparation de transfert intercellulaire évolué de dispositif mobile dans un réseau de communication sans fil
JPWO2016013647A1 (ja) * 2014-07-25 2017-04-27 京セラ株式会社 基地局及び移動局
WO2017162276A1 (fr) * 2016-03-23 2017-09-28 Telefonaktiebolaget Lm Ericsson (Publ) Système d'atténuation de perte de capacité dans un scénario à haute vitesse
US9848362B2 (en) 2015-01-30 2017-12-19 Telefonaktiebolaget Lm Ericsson (Publ) Radio cell arrangement in high speed scenario
WO2018053766A1 (fr) * 2016-09-22 2018-03-29 广东欧珀移动通信有限公司 Procédé de communication, dispositif terminal, et dispositif de réseau
WO2018059560A1 (fr) 2016-09-30 2018-04-05 Huawei Technologies Co., Ltd. Procédé et appareil destinés à desservir des dispositifs de communication mobile à l'aide de protocoles de tunnellisation
WO2018094255A1 (fr) * 2016-11-18 2018-05-24 Qualcomm Incorporated Techniques de sélection d'une technologie d'accès radio sur une bande de spectre radiofréquence sans licence pour desservir une classe de trafic
WO2018172600A1 (fr) * 2017-03-23 2018-09-27 Nokia Technologies Oy Gestion de cellules candidates au transfert
US10251088B2 (en) 2015-04-09 2019-04-02 At&T Mobility Ii Llc Facilitating load balancing in wireless heterogeneous networks
WO2019133048A1 (fr) * 2017-12-30 2019-07-04 Intel Corporation Procédés et dispositifs de communication sans fil
WO2020065126A2 (fr) 2018-09-25 2020-04-02 Nokia Solutions And Networks Oy Préparation de contexte pour transferts intercellulaires conditionnels consécutifs
WO2020116938A1 (fr) * 2018-12-05 2020-06-11 삼성전자 주식회사 Procédé et dispositif pour réaliser un transfert intercellulaire dans un système de communication sans fil
EP3709709A4 (fr) * 2017-11-10 2020-11-25 Beijing Xiaomi Mobile Software Co., Ltd. Procédé et dispositif de transfert intercellulaire de véhicule aérien sans pilote, et station de base
US10993160B2 (en) 2017-09-05 2021-04-27 British Telecommunications Public Limited Company Cellular telecommunications network
US11044637B2 (en) 2016-09-27 2021-06-22 Nokia Technologies Oy Multi-cell allocation
WO2024191824A1 (fr) * 2023-03-10 2024-09-19 Cisco Technology, Inc. Rapports de voisinage directionnels pour optimisation d'itinérance
EP4302525A4 (fr) * 2021-03-04 2025-01-22 LG Electronics Inc. Procédé et appareil destinés à effectuer un transfert intercellulaire sur la base d'un modèle ai dans un système de communication sans fil

Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US20040152480A1 (en) * 2002-11-22 2004-08-05 Telefonaktiebolaget Lm Ericsson (Publ) Method and apparatus for generating a neighbor cell list
WO2008042906A2 (fr) * 2006-10-03 2008-04-10 Qualcomm Incorporated Transfert intercellulaire vers une cellule d'une station de base cible dans un système de communication sans fil
US20100075677A1 (en) * 2008-09-22 2010-03-25 QALCOMM Incorporated Methods and systems for selecting a target bs with the best service supported in wimax handover

Patent Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US20040152480A1 (en) * 2002-11-22 2004-08-05 Telefonaktiebolaget Lm Ericsson (Publ) Method and apparatus for generating a neighbor cell list
WO2008042906A2 (fr) * 2006-10-03 2008-04-10 Qualcomm Incorporated Transfert intercellulaire vers une cellule d'une station de base cible dans un système de communication sans fil
US20100075677A1 (en) * 2008-09-22 2010-03-25 QALCOMM Incorporated Methods and systems for selecting a target bs with the best service supported in wimax handover

Non-Patent Citations (2)

* Cited by examiner, † Cited by third party
Title
ALCATEL-LUCENT ET AL: "Mobility Failure Handling", 3GPP DRAFT; R2-081449_MOBILITY_FAILURE_HANDLING, 3RD GENERATION PARTNERSHIP PROJECT (3GPP), MOBILE COMPETENCE CENTRE ; 650, ROUTE DES LUCIOLES ; F-06921 SOPHIA-ANTIPOLIS CEDEX ; FRANCE, vol. RAN WG2, no. Shenzhen, China; 20080320, 20 March 2008 (2008-03-20), XP050139197 *
HUAWEI: "MRO Signalling Requirements", 3GPP DRAFT; R3-091107, 3RD GENERATION PARTNERSHIP PROJECT (3GPP), MOBILE COMPETENCE CENTRE ; 650, ROUTE DES LUCIOLES ; F-06921 SOPHIA-ANTIPOLIS CEDEX ; FRANCE, no. San Francisco, USA; 20090429, 29 April 2009 (2009-04-29), XP050341480 *

Cited By (43)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US9265086B2 (en) 2013-10-10 2016-02-16 Qualcomm Incorporated Addressing radio link failures in wireless communication systems
EP3174360A4 (fr) * 2014-07-25 2018-03-21 Kyocera Corporation Station de base et station mobile
JPWO2016013647A1 (ja) * 2014-07-25 2017-04-27 京セラ株式会社 基地局及び移動局
US10142892B2 (en) 2014-07-25 2018-11-27 Kyocera Corporation Base station and user terminal performing connection reestablishment processing
WO2016082940A1 (fr) * 2014-11-24 2016-06-02 Telefonaktiebolaget Lm Ericsson (Publ) Procédé et nœud de réseau pour la prise en charge d'opérations de transfert
WO2016119876A1 (fr) * 2015-01-30 2016-08-04 Telefonaktiebolaget Lm Ericsson (Publ) Transfert dans un scenario à grande vitesse
US9848362B2 (en) 2015-01-30 2017-12-19 Telefonaktiebolaget Lm Ericsson (Publ) Radio cell arrangement in high speed scenario
US9860807B2 (en) 2015-01-30 2018-01-02 Telefonaktiebolaget Lm Ericsson (Publ) Handover in high speed scenario
US10251088B2 (en) 2015-04-09 2019-04-02 At&T Mobility Ii Llc Facilitating load balancing in wireless heterogeneous networks
US10798611B2 (en) 2015-04-09 2020-10-06 At&T Intellectual Property I, L.P. Facilitating load balancing in wireless heterogeneous networks
WO2016209553A1 (fr) * 2015-06-25 2016-12-29 Qualcomm Incorporated Préparation de transfert intercellulaire évolué de dispositif mobile dans un réseau de communication sans fil
WO2017162276A1 (fr) * 2016-03-23 2017-09-28 Telefonaktiebolaget Lm Ericsson (Publ) Système d'atténuation de perte de capacité dans un scénario à haute vitesse
WO2018053766A1 (fr) * 2016-09-22 2018-03-29 广东欧珀移动通信有限公司 Procédé de communication, dispositif terminal, et dispositif de réseau
US10945196B2 (en) 2016-09-22 2021-03-09 Guangdong Oppo Mobile Telecommunications Corp., Ltd. Communications method, terminal device and network device
US11044637B2 (en) 2016-09-27 2021-06-22 Nokia Technologies Oy Multi-cell allocation
US10652784B2 (en) 2016-09-30 2020-05-12 Huawei Technologies Co., Ltd. Method and apparatus for serving mobile communication devices using tunneling protocols
WO2018059560A1 (fr) 2016-09-30 2018-04-05 Huawei Technologies Co., Ltd. Procédé et appareil destinés à desservir des dispositifs de communication mobile à l'aide de protocoles de tunnellisation
EP3510809A4 (fr) * 2016-09-30 2019-07-17 Huawei Technologies Co., Ltd. Procédé et appareil destinés à desservir des dispositifs de communication mobile à l'aide de protocoles de tunnellisation
CN109952784A (zh) * 2016-11-18 2019-06-28 高通股份有限公司 用于在免许可射频频谱带上选择无线接入技术以用于为一类业务进行服务的技术
CN109952784B (zh) * 2016-11-18 2021-06-15 高通股份有限公司 用于在免许可频带上选择无线接入技术的方法和装置
US10716047B2 (en) 2016-11-18 2020-07-14 Qualcomm Incorporated Techniques for selecting a radio access technology over an unlicensed radio frequency spectrum band for serving a class of traffic
WO2018094255A1 (fr) * 2016-11-18 2018-05-24 Qualcomm Incorporated Techniques de sélection d'une technologie d'accès radio sur une bande de spectre radiofréquence sans licence pour desservir une classe de trafic
US11343722B2 (en) 2017-03-23 2022-05-24 Nokia Technologies Oy Management of handover candidate cells
WO2018172600A1 (fr) * 2017-03-23 2018-09-27 Nokia Technologies Oy Gestion de cellules candidates au transfert
US10993160B2 (en) 2017-09-05 2021-04-27 British Telecommunications Public Limited Company Cellular telecommunications network
EP3709709A4 (fr) * 2017-11-10 2020-11-25 Beijing Xiaomi Mobile Software Co., Ltd. Procédé et dispositif de transfert intercellulaire de véhicule aérien sans pilote, et station de base
US11665611B2 (en) 2017-11-10 2023-05-30 Beijing Xiaomi Mobile Software Co., Ltd. Method and device for unmanned aerial vehicle handover and base station
EP4138456A1 (fr) * 2017-11-10 2023-02-22 Beijing Xiaomi Mobile Software Co., Ltd. Procédé et dispositif de transfert intercellulaire de véhicule aérien sans pilote, et station de base
US12075306B2 (en) 2017-11-10 2024-08-27 Beijing Xiaomi Mobile Software Co., Ltd. Method and device for unmanned aerial vehicle handover and base station
US11641644B2 (en) 2017-12-30 2023-05-02 Intel Corporation Methods and devices for wireless communications
WO2019133048A1 (fr) * 2017-12-30 2019-07-04 Intel Corporation Procédés et dispositifs de communication sans fil
EP3827615A4 (fr) * 2018-09-25 2022-04-27 Nokia Solutions and Networks Oy Préparation de contexte pour transferts intercellulaires conditionnels consécutifs
CN112740754A (zh) * 2018-09-25 2021-04-30 诺基亚通信公司 连续有条件切换的上下文准备
US11930416B2 (en) 2018-09-25 2024-03-12 Nokia Solutions And Networks Oy Context preparation for consecutive conditional handovers
WO2020065126A2 (fr) 2018-09-25 2020-04-02 Nokia Solutions And Networks Oy Préparation de contexte pour transferts intercellulaires conditionnels consécutifs
CN112740754B (zh) * 2018-09-25 2024-09-13 诺基亚通信公司 连续有条件切换的上下文准备
KR20200068458A (ko) * 2018-12-05 2020-06-15 삼성전자주식회사 무선 통신 시스템에서 핸드오버를 수행하는 방법 및 장치
WO2020116938A1 (fr) * 2018-12-05 2020-06-11 삼성전자 주식회사 Procédé et dispositif pour réaliser un transfert intercellulaire dans un système de communication sans fil
US11997550B2 (en) 2018-12-05 2024-05-28 Samsung Electronics Co., Ltd Method and device for performing handover in wireless communication system
KR102734950B1 (ko) * 2018-12-05 2024-11-28 삼성전자주식회사 무선 통신 시스템에서 핸드오버를 수행하는 방법 및 장치
US12439474B2 (en) 2018-12-05 2025-10-07 Samsung Electronics Co., Ltd. Method and device for performing handover in wireless communication system
EP4302525A4 (fr) * 2021-03-04 2025-01-22 LG Electronics Inc. Procédé et appareil destinés à effectuer un transfert intercellulaire sur la base d'un modèle ai dans un système de communication sans fil
WO2024191824A1 (fr) * 2023-03-10 2024-09-19 Cisco Technology, Inc. Rapports de voisinage directionnels pour optimisation d'itinérance

Similar Documents

Publication Publication Date Title
WO2014089051A1 (fr) Commande de mobilité de connexion améliorée pour réseaux à petites cellules
JP7595737B2 (ja) 通信システム、端末装置およびＳｇＮＢ
US11051219B2 (en) Method and apparatus for controlling mobility for cell having small cell service area in mobile communication system
US11070996B2 (en) Method for controlling wireless link and wireless connection of terminal in wireless communication system, and apparatus supporting same
US10674521B2 (en) Method and apparatus for transmitting and receiving data in wireless communication system
EP3585129B1 (fr) Procédé et dispositif permettant de transmettre un message d'informations de défaillance de groupe scg dans un système de communication sans fil
US9749910B2 (en) Method and apparatus for transmitting user equipment group information in wireless communication system
JP6074109B2 (ja) 無線通信システムにおけるトラフィックステアリングのための補助情報を適用するための方法及び装置
JP6082817B2 (ja) 複数の無線接続技術を支援する端末が無線リンク失敗の発生時に回復する方法及びそのための装置
JP6174263B2 (ja) ユーザ端末及び基地局
US10154438B2 (en) Method and apparatus for performing interworking between 3GPP and WLAN for dual connectivity in wireless communication system
JP6110565B2 (ja) セル訪問履歴伝送方法及びその無線装備
EP2781123B1 (fr) Réalisation d'un équilibrage de charge de mobilité et d'une optimisation de robustesse de mobilité entre des n uds d'accès pour seulement un sous-ensemble d'équipements d'utilisateurs
US20130183971A1 (en) Systems And/Or Methods For Providing Relay Mobility
US20160095004A1 (en) Rrc re-establishment on secondary enodeb for dual connectivity
US20210345150A1 (en) Method and device for configuring and reporting measurement for lte/nr interworking in wireless communication system
JP2016524419A (ja) 訪問セル履歴伝送方法及びその無線装備
WO2015133954A1 (fr) Orientation de sélection de mobilité et/ou d'accès entre des cellules
EP3518582B1 (fr) Procédé et terminal pour effectuer une procédure de resélection de cellule
US9867105B2 (en) Method and apparatus for transmitting message in wireless communication system
JP6371008B2 (ja) 通信方法、セルラ基地局及び無線ｌａｎ終端ノード
US10986485B2 (en) Method for measuring mobility state of terminal and apparatus for supporting same
Abuelgasim et al. High Speed Mobility Management Performance in a Real LTE Scenario
WO2025111557A1 (fr) Procédés et appareil de signalement de mesure sur la base d'une prédiction de temps de séjour dans une cellule
HK1175630A (en) Ferforming measurements in wireless communications using multiple carriers

Legal Events

Date Code Title Description
121 Ep: the epo has been informed by wipo that ep was designated in this application

Ref document number: 13815222

Country of ref document: EP

Kind code of ref document: A1

DPE1 Request for preliminary examination filed after expiration of 19th month from priority date (pct application filed from 20040101)
NENP Non-entry into the national phase

Ref country code: DE

122 Ep: pct application non-entry in european phase

Ref document number: 13815222

Country of ref document: EP

Kind code of ref document: A1