WO2015072648A1 - 복수의 통신시스템이 연동되는 통신 환경에서 신호를 전송 및 수신하는 방법과 이를 위한 장치 - Google Patents
복수의 통신시스템이 연동되는 통신 환경에서 신호를 전송 및 수신하는 방법과 이를 위한 장치 Download PDFInfo
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- WO2015072648A1 WO2015072648A1 PCT/KR2014/006150 KR2014006150W WO2015072648A1 WO 2015072648 A1 WO2015072648 A1 WO 2015072648A1 KR 2014006150 W KR2014006150 W KR 2014006150W WO 2015072648 A1 WO2015072648 A1 WO 2015072648A1
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- Prior art keywords
- communication system
- base station
- transmission
- terminal
- downlink
- Prior art date
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- 238000004891 communication Methods 0.000 title claims abstract description 245
- 238000000034 method Methods 0.000 title claims description 99
- 230000005540 biological transmission Effects 0.000 claims abstract description 201
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- 230000004044 response Effects 0.000 claims description 16
- 230000010267 cellular communication Effects 0.000 claims description 4
- 230000008054 signal transmission Effects 0.000 claims 3
- 238000010586 diagram Methods 0.000 description 28
- 230000001413 cellular effect Effects 0.000 description 25
- 150000002500 ions Chemical class 0.000 description 20
- 238000005516 engineering process Methods 0.000 description 14
- 230000006870 function Effects 0.000 description 9
- 238000010295 mobile communication Methods 0.000 description 5
- 238000012545 processing Methods 0.000 description 4
- 230000000694 effects Effects 0.000 description 3
- 230000002776 aggregation Effects 0.000 description 2
- 238000004220 aggregation Methods 0.000 description 2
- 238000006243 chemical reaction Methods 0.000 description 2
- 239000003795 chemical substances by application Substances 0.000 description 2
- 230000009977 dual effect Effects 0.000 description 2
- 238000013507 mapping Methods 0.000 description 2
- 230000002093 peripheral effect Effects 0.000 description 2
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Classifications
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04W—WIRELESS COMMUNICATION NETWORKS
- H04W48/00—Access restriction; Network selection; Access point selection
- H04W48/16—Discovering, processing access restriction or access information
-
- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04W—WIRELESS COMMUNICATION NETWORKS
- H04W24/00—Supervisory, monitoring or testing arrangements
- H04W24/02—Arrangements for optimising operational condition
-
- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04W—WIRELESS COMMUNICATION NETWORKS
- H04W48/00—Access restriction; Network selection; Access point selection
- H04W48/08—Access restriction or access information delivery, e.g. discovery data delivery
- H04W48/12—Access restriction or access information delivery, e.g. discovery data delivery using downlink control channel
-
- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04W—WIRELESS COMMUNICATION NETWORKS
- H04W48/00—Access restriction; Network selection; Access point selection
- H04W48/18—Selecting a network or a communication service
-
- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04W—WIRELESS COMMUNICATION NETWORKS
- H04W48/00—Access restriction; Network selection; Access point selection
- H04W48/20—Selecting an access point
-
- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04W—WIRELESS COMMUNICATION NETWORKS
- H04W74/00—Wireless channel access
- H04W74/08—Non-scheduled access, e.g. ALOHA
- H04W74/0833—Random access procedures, e.g. with 4-step access
-
- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04W—WIRELESS COMMUNICATION NETWORKS
- H04W88/00—Devices specially adapted for wireless communication networks, e.g. terminals, base stations or access point devices
- H04W88/02—Terminal devices
- H04W88/06—Terminal devices adapted for operation in multiple networks or having at least two operational modes, e.g. multi-mode terminals
-
- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04W—WIRELESS COMMUNICATION NETWORKS
- H04W84/00—Network topologies
- H04W84/02—Hierarchically pre-organised networks, e.g. paging networks, cellular networks, WLAN [Wireless Local Area Network] or WLL [Wireless Local Loop]
- H04W84/10—Small scale networks; Flat hierarchical networks
- H04W84/12—WLAN [Wireless Local Area Networks]
Definitions
- the present invention relates to wireless communication, and more particularly, to a method and apparatus for transmitting and receiving signals in a communication environment in which a plurality of communication systems are interlocked.
- a multi-RAT terminal having the capability of accessing two or more radio access technology (RAT) or black communication systems.
- RAT radio access technology
- a connection to a specific RAT is established and data is transmitted and received based on a terminal request.
- the multi-RAT terminal cannot simultaneously access multiple RATs. That is, even if the current terminal has a multi-RAT capability, it is not possible to simultaneously transmit and receive data through different RATs.
- the conventional multi-RAT technology does not require interworking between the WLAN and the cellular network, there is a problem of low overall system efficiency.
- the UE can simultaneously access the multiple RATs, it is possible to simultaneously access the multiple RATs by supporting only the flow mobility / IP-flow mapping at the network level without control at the radio level. For this reason, the prior art did not require any control connection between the AP and the cellular network, and has been progressed based on the request of the terminal.
- the technical problem to be achieved in the present invention is to provide a method for a terminal to receive a downlink signal in a communication environment in which a plurality of communication systems are interlocked.
- Another object of the present invention is to provide a method for transmitting an uplink signal by a terminal in a communication environment in which a plurality of communication systems are interworked.
- Another object of the present invention is to provide a terminal for receiving a downlink signal in a communication environment in which a plurality of communication systems work together.
- Another object of the present invention is to provide a terminal for transmitting an uplink signal in a communication environment in which a plurality of communication systems interwork.
- a method of receiving a downlink signal by a terminal in a communication environment in which a plurality of communication systems are interlocked may include the terminal through a first communication system link from a base station of a first communication system. Receiving base station list information of a second communication system adjacent to the network; And turning on the second communication system mode based on the base station list information of the second communication system when the quality of the downlink signal received from the base station of the first communication system does not satisfy the threshold continuously for a predetermined number of times.
- beacon signal or the probe response message includes: And an indicator indicating to support downlink transmission of the first communication system, wherein the base station list information of the second communication system is determined by a base station of the second communication system by a downlink (DL) of the first communication system link. Or it may include an indicator indicating whether to support the transmission of the uplink (UU).
- the method may indicate to the base station of the first communication system that a downlink signal will be received from a base station supporting downlink transmission of the first communication system.
- the method may further include transmitting the indicator.
- the method includes performing an association at ion procedure with a base station supporting downlink transmission of the first communication system; And receiving downlink data or system information of a base station of the first communication system through a second communication system link from a base station supporting downlink transmission of the first communication system.
- the method may further include transmitting uplink data through the first communication system link to a base station of the first communication system.
- the first communication system may be a seller communication system and the second communication system may be a wireless LAN communication system, and a base station supporting downlink transmission of the first communication system may be connected through a link of the first communication system.
- a base station belonging to a second communication system capable of transmitting a received downlink signal to the terminal.
- a method of transmitting a link signal terminal is upstream in a communication environment in which the interlocking plurality of communication systems, to achieve another aspect of the 'is to search for a base station of a first communication system having a threshold value or more of the signal strength step; Receiving base station list information of a second communication system adjacent to the terminal through a first communication system link from the retrieved base station of the first communication system; Turning on a second communication system mode in a case where transmission of RAC!
- KRandom Access CHannel to the base station of the searched first communication system fails a predetermined number of times; Receiving a beacon signal including an indicator indicating to support uplink transmission of the first communication system from a base station included in the base station list information of the second communication system; And recognizing that no uplink transmission or only downlink transmission is possible on the first communication system link based on the beacon signal, wherein base station list information of the second communication system is determined by the second communication system.
- the base station may include an indicator indicating whether the base station supports downlink (DL) or uplink (UL) transmission on the first communication system link.
- the method includes performing an association at ion procedure with a base station supporting uplink transmission of the first communication system; And a RACH signal or a connection establishment request message to a base station supporting uplink transmission of the first communication system.
- the base station supporting uplink transmission of the first communication system includes: And a base station belonging to the second communication system for receiving an uplink signal to be transmitted to the first communication system and transmitting the received uplink signal to a base station of the searched first communication system, wherein the first communication system is a cellular communication system and the second communication system.
- the communication system may be a WLAN communication system.
- a terminal receiving a downlink signal in a communication environment in which a plurality of communication systems are interworked is connected to the terminal through a first communication system link from a base station of a first communication system.
- a receiver for receiving base station list information of an adjacent second communication system And turning on the second communication system mode based on the base station list information of the second communication system when the quality of the downlink signal received from the base station of the first communication system does not meet the threshold continuously for a predetermined number of times. and a processor configured to disconnect a second communication system link from a base station supporting downlink transmission of the first communication system included in the base station list of the second communication system after the second communication system mode turn on.
- the beacon signal or the probe answer message is the first And an indicator indicating to support downlink transmission of a first communication system, wherein the base station list information of the second communication system is determined by a base station of the second communication system or a downlink (DL) or uplink of the first communication system link. It may include an indicator indicating whether to support transmission of a link (UL).
- a terminal for transmitting an uplink signal in a communication environment in which a plurality of communication systems are interlocked includes: a processor for searching for a base station of a first communication system having a signal strength of a threshold or more; And a receiver for receiving base station list information of a second communication system adjacent to the terminal from a first base station of the searched first communication system via a first communication system link, wherein the processor is predetermined as a base station of the searched first communication system.
- the RACH Random Access CHannel
- Indicating to support uplink transmission Receiving a beacon signal including an indicator, wherein the processor recognizes that uplink transmission through the first communication system link is not possible or only downlink transmission is possible based on the beacon signal, and is a base station of the second communication system;
- the list information may include an indicator indicating whether the base station of the second communication system supports downlink (DL) or uplink (UL) transmission on the first communication system link.
- a terminal capable of simultaneously accessing a WLAN (WiFi) and a cellular network may perform a peripheral Wi-Fi system in a situation in which DL reception or UL transmission of the cellular network is difficult.
- Wi-Fi Wireless Fidelity
- a cellular network may perform a peripheral Wi-Fi system in a situation in which DL reception or UL transmission of the cellular network is difficult.
- FIG. 1 is a block diagram showing the configuration of a base station 105 and a terminal 110 in a wireless communication system 100.
- FIG. 2 is an exemplary diagram for explaining an IP flow-based WiFi mobi l i ty.
- FIG. 3 is a diagram illustrating a network structure for explaining an interworking structure between a first communication system (ie, a cellar communication system) and a second communication system (wireless LAN communication system).
- a first communication system ie, a cellar communication system
- a second communication system wireless LAN communication system
- FIG. 4 is a diagram illustrating a network structure of WiFi-Cel hilar interworking according to the present invention.
- FIG. 5 is an exemplary diagram for explaining a scenario of a WiFi-Cel lular converged network.
- FIG. 6 is an exemplary diagram for describing a method of recognizing a terminal when only UL UL transmission is possible.
- FIG. 7 is an exemplary diagram for describing a method of recognizing a terminal when only DL transmission is possible through a cell.
- FIG. 8 is an exemplary diagram for describing a procedure for initial attach by an MS when only cell UL transmission is possible.
- FIG. 9 is an exemplary diagram for explaining a cell search procedure according to movement of a UE in a situation where only UL UL transmission is possible.
- FIG. 10 is an exemplary diagram for explaining an example of an initial attach procedure of a terminal in a situation where only DL DL transmission is possible.
- FIG. 11 is an exemplary diagram for explaining another example of an initial attach procedure of a terminal in a situation where only DL DL transmission is possible.
- FIG. 12 is a diagram for explaining a procedure for establishing a UL link to WiFi according to the movement of a terminal in a situation where only DL DL transmission is possible.
- FIG. 13 is an exemplary view for explaining a method of entering a radio link failure which improves a problem of the existing LTE system scheme.
- FIG. 14 is another exemplary view for explaining a cell search procedure according to movement of a terminal in a situation where only a UL UL transmission is possible.
- FIG. 15 is another exemplary diagram for explaining a procedure for establishing a UL link to WiFi according to a movement of a terminal in a situation where only cell DL transmission is possible.
- a terminal collectively refers to a mobile or fixed user terminal device such as UE Jser Equipment), MSCMobile Station), AMSC Advanced Mobile Station).
- the base station collectively refers to any node of the network side that communicates with the terminal such as a Node B, an eNode B, a Base Station, and an Access Point (AP).
- AP Access Point
- a user equipment may receive information from a base station through a downlink, and the terminal may also transmit information through an uplink.
- the information transmitted or received by the terminal includes data and various control information, and various physical channels exist according to the type and purpose of the information transmitted or received by the terminal.
- CDM code division multiple access FDMA
- frequency division multiple access FDMA
- time division multiple access TDMA
- orthogonal frequency division multiple access FDMA
- SC to FDMA single carrier frequency division multiple access
- CDMA may be implemented by a radio technology such as UTRAOJni versa 1 Terrestrial Radio Access) or CDMA2000.
- TDMA may be implemented with a wireless technology such as Global System for Mobile Communications (GSM) / Gener a 1 Packet Radio Service (GPRS) / Enhanced Data Rates for GSM Evolution (EDGE).
- GSM Global System for Mobile Communications
- GPRS Packet Radio Service
- EDGE Enhanced Data Rates for GSM Evolution
- 0FDMA may be implemented in a wireless technology such as IEEE 802.11 (Wi-Fi), IEEE 802.16 (WiMAX), IEEE 802-20, E to UTRA (Evolved UTRA).
- UTRA is part of the UMTSOJniversal Mobile Telecx munications System.
- 3rd Generation Partnership Project (3GPP) long term evolution (LTE) is part of Evolved UMTS (E-UMTS) using E—UTRA and employs 0FDMA in downlink and SC-FDMA in uplink.
- LTE-A Advanced is an evolution of 3GPP LTE.
- FIG. 1 is a block diagram showing the configuration of a base station 105 and a terminal 110 in a wireless communication system 100.
- the wireless communication system 100 includes one or more base stations and / or one or more terminals. can do.
- the base station 105 includes a transmit (Tx) data processor 115, a symbol modulator 120, a transmitter 125, a transmit / receive antenna 130, a processor 180, and a memory 185.
- the receiver 190 may include a symbol demodulator 195 and a reception data processor 197.
- the terminal 110 includes a transmit (Tx) data processor 165, a symbol modulator 170, a transmitter 175, a transmit / receive antenna 135, a processor 155, a memory 160, a receiver 140, and a symbol.
- Demodulator 145 receive data processor 150.
- the base station 105 and the terminal 110 are provided with a plurality of transmit and receive antennas. Accordingly, the base station 105 and the terminal 110 according to the present invention support a MIMC Multiple Input Multiple Output (MIC) system. In addition, the base station 105 according to the present invention may support both the SU-MIM0 (Single User-MIMO) and the MU-MIM0 (Multi User-MIMO) schemes.
- SU-MIM0 Single User-MIMO
- MU-MIM0 Multi User-MIMO
- the transmit data processor 115 receives the traffic data, formats the received traffic data, codes it, interleaves and modulates (or thimble maps) the coded traffic data, and modulates symbols. ("Data symbols").
- the symbol modulator 120 receives and processes these data symbols and pilot symbols to provide a stream of symbols.
- the symbol modulator 120 multiplexes the data and pilot symbols and sends it to the transmitter 125.
- each transmission symbol may be a data symbol, a pilot symbol, or a signal value of zero.
- pilot symbols may be sent continuously. Pilot symbols may be frequency division multiplexing (FDM), orthogonal frequency division multiplexing (OFDM), time division multiplexing (TDM), or code division multiplexing (CDM) symbols.
- FDM frequency division multiplexing
- OFDM orthogonal frequency division multiplexing
- TDM time division multiplexing
- CDM code division multiplexing
- Transmitter 125 receives the stream of symbols and converts it into one or more analog signals, and further adjusts (eg, amplifies, filters, and frequency upconverting) these analog signals. As a result, a downlink signal suitable for transmission over a wireless channel is generated, and the transmission antenna 130 transmits the generated downlink signal to the terminal.
- the receiving antenna 135 is a downlink from the base station
- the signal is received and provided to the receiver 140.
- Receiver 140 adjusts the received signal (eg, filtering, amplifying, and frequency downconverting), and digitizes the adjusted signal to obtain samples.
- the symbol demodulator 145 demodulates the received pilot symbols and provides them to the processor 155 for channel estimation.
- the symbol demodulator 145 also receives a frequency equality estimate for the downlink from the processor 155 and performs data demodulation on the received data symbols to obtain data (which are estimates of the transmitted data symbols). Obtain symbol estimates and provide data symbol estimates to receive (Rx) data processor 150. Receive data processor 150 demodulates (ie, symbol de-maps), deinterleaves, and decodes the data symbol estimates to recover the transmitted traffic data.
- symbol demodulator 145 and receive data processor 150 are complementary to the processing by symbol modulator 120 and transmit data processor 115 at base station 105, respectively.
- the terminal 110 on the uplink, the transmit data processor 165 processes the traffic data, and provides data symbols.
- the symbol modulator 170 may receive and multiplex data symbols, perform modulation, and provide a stream of symbols to the transmitter 175.
- Transmitter 175 receives and processes the stream of symbols to generate an uplink signal.
- the transmit antenna 135 transmits the generated uplink signal to the base station 105.
- an uplink signal is received from the terminal 110 through the receiving antenna 130, and the receiver 190 processes the received uplink signal to obtain samples.
- the symbol demodulator 195 then processes these samples to provide received pilot symbols and data symbol estimates for the uplink.
- the received data processor 197 processes the data symbol estimates to recover the traffic data sent from the terminal 110.
- Processors 155 and 180 of each of terminal 110 and base station 105 instruct (eg, control, coordinate, manage, etc.) operation at terminal 110 and base station 105, respectively.
- Respective processors 155 and 180 may be connected with memory units 160 and 185 that store program codes and data.
- Memory 160, 185 is coupled to processor 180 to store operating systems, applications, and general files.
- the processor (155, 180) is a controller (micro), It may also be referred to as a controller, a microprocessor, a microcomputer, or the like. Meanwhile, the processors 155 and 180 may be implemented by hardware or firmware, software, or a combination thereof. When implementing an embodiment of the present invention using hardware, ASICs pplication specific integrated circuits (DSICs) or digital signal processors (DSPs), digital signal processing devices (DSPDs), programmable logic devices (PIDs), Field programmable gate arrays (FPGAs) and the like may be included in the processors 155 and 180.
- DSICs application specific integrated circuits
- DSPs digital signal processors
- DSPDs digital signal processing devices
- PIDs programmable logic devices
- FPGAs Field programmable gate arrays
- the pipware or software may be configured to include modules, procedures, or functions for performing the functions or operations of the present invention.
- Firmware or software specifically configured to carry out the invention may be provided within the processors 155 and 180 or stored in the memory 160 and 185 to be driven by the processor 155 and 180.
- the layers of the air interface protocol between the terminal and the base station in the wireless communication system are based on the lower three layers of the OSKopen system interconnection model, which is well known in the communication system, based on the first three layers (Ll second layer (L2)). And a third layer (L3)
- the physical layer belongs to the first layer and provides an information transmission service through a physical channel
- a Radio Resource Control (RRC) layer belongs to the third layer and Providing control radio resources between networks
- a terminal and a base station can exchange RRC messages via a wireless communication network and an RRC layer.
- the processor 155 of the terminal and the processor 180 of the base station process signals and data except for a function and a storage function of the terminal 110 and the base station 105 respectively for receiving or transmitting a signal.
- the processor 155 180 will not be specifically described below.
- a series of operations such as a function of receiving or transmitting a signal and a data processing other than a storage function are performed.
- a terminal having a capability of accessing two or more radio access technologies is referred to as a multi-RAT terminal in the present invention. It will be referred to, but abbreviated as terminal.
- RATs radio access technologies
- In order to access a specific RAT it is possible to set a connection ion to a specific RAT and perform data transmission / reception based on a terminal request.
- Information can be exchanged between heterogeneous networks using an ANDSF server.
- FIG. 2 is an exemplary diagram for explaining IP flow based WiFi mobility.
- IFOM IP Flow Mobility: 3GPP (Rel-10) standard describes 3G / WiFi Seamless Off load, WLAN offloading technology of DSMIPv6-based IP Flow unit, DSMIPv6 (Dual Stack Mobile IPv6) terminal and network It provides a solution that supports IPv4 and IPv6 simultaneously. Due to the diversification of mobile communication networks, the adoption of IPv6 has expanded, and mobility support has emerged as a core technology, so even the existing IPv4 network needs mobility support, so it is adopting DSMIPv6. In addition, the terminal provides a client-based MIP technology that detects its movement and informs the agent. HA is an agent that manages mobility of mobile node, and there exists Flow Binding Table and Binding Cache table. If PMIPv6 is used, IF0M uses only DSMIPv6 because of the dull problem that IP flow unit management is difficult.
- MAPC0N Multi Access PDN Connectivity: Simultaneous multiple PDN connect ivi ty to different APNs, and as a protocol independent technology, ⁇ , GTP, DSMIPv6 can be used. All data flows that were being transmitted through one PDN are moved.
- FIG. 3 is a diagram illustrating a network structure for explaining an interworking structure between a first communication system (ie, a cellar communication system) and a second communication system (wireless LAN communication system).
- a first communication system ie, a cellar communication system
- a second communication system wireless LAN communication system
- LTE system which is one of cellar communication systems corresponding to the first communication system
- WiFi system which is one of the wireless LAN communication systems corresponding to the second communication system
- a backhaul control connect ion is established between the AP and the eNB through a backbone network (eg, P—GW or Evolved Packet Core (EPC)).
- a backbone network eg, P—GW or Evolved Packet Core (EPC)
- EPC Evolved Packet Core
- a first communication system (or first communication) using a first wireless communication scheme through interworking between a plurality of communication networks.
- Network and a second communication system (or a second communication network) using both wireless communication methods can be simultaneously supported.
- the first communication network or the first communication system is referred to as a primary network or a primary system, respectively, and the second communication network or the second communication system is referred to as a secondary network or a secondary system, respectively.
- secondary system can be called.
- the UE may be configured to simultaneously support LTE (or LTE-A) and WiFi (local area communication system such as WLAN / 802.11).
- LTE Long Term Evolution
- WiFi local area communication system
- Such a UE may be referred to herein as a multi-system capability UE.
- the primary system has wider coverage and may be a network for transmission of control information.
- An example of a primary system may be a WiMAX or LTE (LTE-A) system.
- the secondary system is a network having a small coverage, it may be a system for data transmission.
- the secondary network may be, for example, a WLAN system such as WLAN or WiFi.
- the entity in charge of interworking assumes the cell as an entity in the network, and assumes that interworking functions are implemented in the following three entities.
- Mobility Management Entity (MME)-reuse existing entity
- the interworking function is related to an interworking related procedure that may occur between an eNB-UE or an eNB- AP, and the entity managing the interworking stores / manages AP information.
- eNB / MME / I ⁇ E stores / manages information of APs under its coverage.
- the AP and the primary system for example, a cellular communication system such as an LTE system or a WiMAX system
- a secondary system for example, WiFi
- eNBs base stations
- an AP having a radio interface with an eNB is also called an eAP.
- the eAP should support not only 802.11 MAC / PHY but also LTE protocol stack or WiMAX protocol stack for communication with eNB, which means that eNB can communicate with eNB.
- FIG. 4 is a diagram illustrating a network structure of WiFi-Cel hilar interworking according to the present invention.
- a dual mode or mul ti-RAT terminal can more efficiently implement a WiFi-cel lular converged network in an environment where a terminal capable of simultaneously transmitting and receiving WiFi and Cel lular networks exists.
- the cellular network can manage the information of the AP according to the following four methods.
- eNB uses a wireless control connection (wi reless control connect ion) with the AP
- the eNB means controlling the AP using a wireless control connection with the AP.
- ⁇ means controlling the AP using a control connection between E and the AP (ie, the s condary system).
- the AP is controlled by using a control connection between the IWME and the AP (that is, the secondary system).
- FIG. 5 is an exemplary diagram for explaining a scenario of a WiFi-Cel lular converged network.
- the scenario 1 in FIG. 5 is a cell-only access scenario of a terminal.
- a definition of a pre-chain is required.
- AP information management for interworking is performed at the network level (eel iular-WiFi), and WiFi dicoverage and WiFi network access are performed at the devi ce level (cel lular-devi ce-WiFi).
- 2 -1 to 2 -3 represent WiFi automatic switching of the user plane (U-Plane), WiFi automatic switching of f low, WiFi automatic switching of the bearer, and WiFi automatic switching of data, respectively, between the cell and the WiFi.
- bandwidth segregation is automatic switching for each flow (service / IP flow), such as 2 -2, and different flows are transmitted through different RATs.
- the automatic conversion for each flow may be one or more service / IP flow (s). That is, the conversion may be a flow unit (2 -2-1) or a data radio (or EPS) bearer switching (2 -2-2).
- Bandwidth aggregation enables transmission through different RATs in data units even if the flow is the same as 2 -3.
- Performance Enhancement eg, 3D Beamforming
- Positional Constraints eg, Cell of a Base Station (edge, indoor
- Performance Enhancement eg, 3D Beamforming
- Positional Constraints eg, Cell of a Base Station (edge, indoor
- the UE should be able to recognize that the region can only receive the DL, through which it is necessary to minimize unnecessary RACH (Random Access Channel) procedure or the initial access procedure. That is, in this case, the terminal needs to use only downlink (DL) in the Byr system.
- RACH Random Access Channel
- the terminal may sufficiently transmit the UL signal to the base station, but DL reception may be difficult due to a lack of transmission power or performance of the base station.
- the terminal should be able to recognize that the region is a region capable of only UL transmission, through which the cell should be able to receive DL information through Wi-Fi. That is, in this case, the UE needs to use only uplink (UL) in the cellar system.
- UL uplink
- the base station in the cell knows in advance the information on the region in which the UL or the UL transmission of the terminal over the cell network by the channel information collected from the terminal in the past cell or operator setting in advance. Assume
- the present invention provides an environment in which a terminal capable of simultaneously accessing a WLAN and an eel hilar can transmit and receive cell #ler network data through a surrounding Wi-Fi system in a situation where DL reception or UL transmission of a Overr network is difficult. How to do it.
- the technique of the present invention is a specific area (eg, urban area, cell boundary, indoor) when the terminal is able to receive or transmit only one link of DL or UL of the mobile network due to geographical, physical characteristics or network conditions.
- AP is installed to propose to operate as a system that supports the UL or DL link of the cell link, and defines the procedure of the terminal to use the child.
- RLF radio link failure
- the terminal may determine that a radio link failure occurs when the following problem occurs in the radio link.
- the UE periodically receives RS from the eNB in a physical channel (I? Eference). If the quality of the signal is detected below the threshold, it may be determined that out-of-sync has occurred in the physical channel. When this out-of-sync occurs a certain number of times in succession, it informs RRC. Receiving an out-of-sync message from the physical layer, the RRC drives the timer T310 and waits for the physical channel to be resolved while the T310 is running. If the RRC receives a message from the physical layer that a certain number of consecutive in-syncs have occurred from the physical layer while the T310 is running, the RRC determines that the physical channel problem has been resolved and stops the driving witness T310. . However, if no in-sync message is received until T310 expires, the RRC determines that a radio link failure has occurred.
- random access resource selection (Random Access Resource select ion)-> Random Access Preamble transmission (Random Access Preamble transmission)-> Random Access Response recept ion (Random Access Response recept ion) )-> Contention Resolut ion.
- the entire process is referred to as one random access process. If this process is not successfully completed, the user waits for the back off time and performs the next random access process. However, if this random access process is attempted a predetermined number of times (for example, preambleTransMax) but is not successful, it is notified to the RRC, and the RRC determines that a radio link failure has occurred.
- preambleTransMax for example, preambleTransMax
- the UE retransmits an RLC PDU that has not been successfully transmitted when using an AM (Acknowl edged Mode) RLC in the RLC layer.
- AM Acknowl edged Mode
- the RRC informs the RRC, and the RRC determines that an RLF has occurred.
- the RRC determines the occurrence of a radio link failure for three reasons as described above.
- RRC connection ion reestablishment which is a procedure for reestablishing the RRC connection with the eNB, is performed.
- FIG. 6 is an exemplary diagram for describing a method of recognizing a terminal when only UL UL transmission is possible.
- a base station (eNB) of a celler network is a subject that manages or operates an interworking between the celler network and a WiFi network with information about an area where the eNB cannot transmit DLs to the cell.
- Transmit to IWE S610.
- the IWE obtains information on the region where the DL can not be transmitted from the base station (eNB) in each cell.
- the IWE exchanges information on whether the A Access Point of the WiFi network supports the DL transmission, and can determine whether an AP supports the DL transmission (S620).
- each AP is their saelreul multiple supporting DL transmission to the IWE be informed whether or not (i.e., whether the line to pass the DL signal received from the eNB to the UE) ', IWE is to obtain this information (S620).
- a base station (eNB) of a cellar network cannot transmit system information (System Informat ion, SI) of the cellar network to a terminal in an area where cell cell DL transmission is not possible.
- SI System Informat ion
- a beacon signal including an indicator indicating a DL transmission support may be received from at least one AP of the neighboring APs (S640).
- the UE may recognize that this region is an area in which only UL transmission is possible for the cell or DL transmission is impossible for the cell. Recognizing this fact, the UE cannot receive a DL signal directly from an eNB located in a cell where DL transmission is impossible. As shown in FIG.
- the AP when the AP receives a cell toll DL signal (for example, system information of the cell tolerant network) from the eNB, the AP transmits the cell to the UE, and the terminal sends a cell to the cell DL signal (eg, from the AP).
- a cell toll DL signal for example, system information of the cell tolerant network
- FIG. 7 is an exemplary diagram for explaining a method of recognizing a terminal when only DL DL transmission is possible.
- a base station (eNB) of a Byr network is an IWE that manages or operates an interworking between the celller network and a WiFi network for information on an area where a UL UL transmission of a terminal is impossible. It transmits to (S710).
- the IWE obtains information on the area where the UL can not be transmitted from the base station (eNB) in each cell.
- IWE is the AP (Access of WiFi network) Point) and information on whether or not to support the UL UL transmission may be exchanged to determine which AP supports the UL UL transmission (S720).
- Each AP informs the IWE whether it supports UL transmission to the cell (that is, whether it can transmit the UL signal received from the UE to the eNB), and the IWE acquires this information (S720).
- a UE in a region where the UL UL transmission is not possible cannot transmit a RACH (Random Access CHannel) or a RACH preamble through the Overr network.
- the terminal may receive system information including information on the neighboring AP from the eNB (S730).
- the RACH is transmitted to enter the network, the maximum number of retries are attempted until the RACH transmission is successful. If you attempt to transmit a RACH as many times as the maximum number of retries and fail, turn on WiFi, or check whether the cell is capable of DL transmission only or cell is not UL UL transmission before falling into a radio link failure (RLF).
- RLF radio link failure
- a beacon signal including an indicator indicating a UL transmission support may be received from at least one AP of the neighboring APs (S750).
- the UE may recognize that this region is an area where only DL transmission is possible, which is impossible for UL transmission. Recognizing this fact, the UE performs an association procedure with any one of the APs in neighboring APs (S770), and transmits a signal for performing an initial access process to the AP (S780). The AP receives the initial access signal from the terminal and delivers it to the eNB (S780).
- FIG. 8 is an exemplary diagram for describing a procedure for initial attach by an UE when only cell UL transmission is possible.
- a base station (eNB) of a cellar network may manage or operate an interworking between the cellar network and a WiFi network with information about a region where the eNB is unable to transmit a cell DL. Transmit to IWE (S810).
- the IWE obtains information on the region where the DL can not be transmitted from the base station (eNB) in each cell.
- the IWE may determine whether an AP supports cell DL transmission by exchanging information on whether the A Access Point) of the WiFi network supports the DL transmission (S820).
- Each AP has its own IWE Whether the processor supports DL transmission (i.e., whether the DL signal received from the eNB can be transmitted to the UE) is informed, and the IWE acquires this information (S820).
- a base station (eNB) of a cellar network cannot transmit system information (System Informat ion, SI) of the cellar network to a terminal in an area where cell DL transmission is impossible.
- the terminal when the power is turned on, starting the sal search, if the Sal of the DL signal strength is more than a certain intensity is detected, turn on the WiFi and performs the WiFi scanning (S830) .
- the WiFi scanning when searching for the AP supporting the DL DL transmission, the UE may recognize that the corresponding region is an area where only UL UL transmission is possible and the DL DL transmission is not possible with the cell (S840).
- the UE receives a beacon signal including an indicator indicating the support of the DL transmission from the at least one AP of the neighbor AP (S840), it may be confirmed that the cell is in an area where DL transmission is impossible (S860). . Recognizing this fact, the UE cannot directly receive the DL signal from the eNB in the region where the DL transmission is impossible.
- the UE may receive the system information of the eNB through the AP even though the terminal does not perform the association procedure with the AP (method 1). .
- the AP may transmit the system information of the eNB to the terminal at the request of the terminal (S880).
- the UE needs to perform an Associ at ion procedure with the AP in order to support DL transmission to the cell (S870).
- the UE may transmit a RACH preamble to the eNB using the cell UL link (S890).
- FIG. 9 is an exemplary diagram for describing a sal search procedure according to movement of a terminal in a situation where only UL UL transmission is possible.
- a base station (eNB) of a Overr network may be configured to manage or operate interworking between the celller network and the WiFi network for information on a region where the eNB cannot transmit DLs to the cell. Transmit to IWE (S910).
- the IWE obtains information on the region where the DL transmission is impossible from the base station (eNB) in each cell.
- the IWE exchanges information about whether the cellular network supports DL transmission with the AP (Access Point) of the WiFi network, so as to determine whether the AP supports DL transmission with the cell (S920).
- Each AP informs the IWE whether it supports DL transmission to the cell (that is, whether it can deliver the DL signal received from the eNB to the UE), and the IWE acquires this information (S920).
- Saller The base station (eNB) of the network may transmit neighboring AP list information including information on cell system information, support of DL DL transmission to the AP, or information on whether to support cell UL transmission to the UE in an RRC_Connected state (S930). ).
- the UE in the RRC_Connected state continuously determines that the quality of the DL signal of the eNB of the cell network is less than or equal to a predetermined threshold (for example, a predetermined number of consecutive DL out-of-syncs occur). If there is an AP that supports DL transmission to the cell, the cell turns on WiFi and searches for an AP (S950).
- the terminal may transmit a probe request message to the searched AP (S960), and may receive a probe response message or a beacon signal from the AP including an indicator indicating the DL transmission as a response to the probe request message (S970). .
- the UE When the UE receives a probe answering message or a beacon signal including an indicator indicating the cell to support DL transmission from the AP, it may be confirmed that the UE is in an area where DL reception is not possible from the cell (eNB) (S980). .
- the UE needs to perform an Associat ion procedure with the AP in order to receive DL transmission from the cell (S985). Thereafter, the terminal receives the DL DL data or the SR system information from the AP (S990). The UE may directly transmit UL data to the eNB using the cell UL link (S995).
- FIG. 10 is an exemplary diagram for explaining an example of an initial attach procedure of a terminal in a situation in which only DL DL transmission is possible.
- the base station (eNB) of the cellar network is an IWE that manages or operates interworking between the cellar network and the WiFi network for information on a region where the terminal cannot transmit UL UL.
- S1010 is transmitted to.
- the IWE obtains information on UL non-transmitable regions from a cell base station (eNB) in each cell.
- the IWE exchanges information on whether the WLAN supports AKAccess Point) and the UL UL transmission, so as to determine which AP supports the UL UL transmission (S1020).
- Each AP informs the IWE whether it supports UL transmission to the cell (that is, whether it can transmit the UL signal received from the UE to the eNB), and the IWE acquires this information (S1020).
- a cell searcher system starts a cell search (cell search) and finds a cell having a certain intensity or more and includes neighbor AP list information from the eNB. (S1030) can be received.
- UE receives the received cell Based on the system information, it may be recognized that there is an AP supporting cell UL transmission in the corresponding cell (S1030).
- a UE in a region where cellular UL transmission is not possible cannot transmit a random access channel (RAC) or a RACH preamble through a cellular network.
- the RACH is transmitted to enter the network, and a maximum number of retries is attempted until the RACH transmission is successful (S1040). If the attempt to transmit the RACH as many times as the maximum retry attempts fails, the WiFi is turned on (S1050).
- the terminal may perform WiFi scanning, search for an AP supporting the UL UL transmission as a result of the execution, and receive a beacon signal including an indicator indicating support for UL transmission of the cell from the found AP ( S1060).
- the UE may recognize that this region is a region where only UL transmission is possible or a region where UL transmission is not possible through the cell (S1070).
- the UE performs an association procedure with the discovered AP (S1080), and transmits a RACH, RACH preamble, or connection establishment request message to the AP (S1085).
- the AP delivers the RACH, RACH preamble, or connect ion establishment request message received from the UE to the eNB (S1085).
- the UE By performing this procedure, if the UE is located in an area where UL transmission is not possible for the cell, the UE transmits an UL message for performing an initial attach procedure after association with the AP through WiFi (S1085), and responds to this. May receive from the base station eNB of the cell network (S1090).
- FIG. 11 is an exemplary diagram for explaining another example of an initial attach procedure of a terminal in a situation where only DL transmission may be performed using a cell.
- a base station (eNB) of a cellular network manages interworking between the cellular network and a WiFi network with information about a region in which cell UL UL transmission is not possible. Transmit to IWE (S1110).
- the IWE obtains information on UL non-transmitable regions from a cell base station (eNB) in each cell.
- the IWE may determine whether an AP supports the UL UL transmission by exchanging information on whether the A Access Point of the WiFi network supports the UL transmission with the cell (S1120).
- Each AP informs the IWE whether it supports UL transmission to the cell (that is, whether it can deliver the UL signal received from the UE to the eNB), and the IWE acquires this information (S1120).
- Multi-RAT UE when the power is turned on, cell search (cell search), a cell having a specific strength or more can be found, and cell information including neighbor AP list information can be received from the eNB (S1130).
- the UE turns on WiFi after recognizing that there is an AP supporting cell UL transmission in the corresponding cell on the basis of the received saler system information (S1140).
- the terminal may perform WiFi scanning, search for an AP supporting the saluler UL transmission as a result of the execution, and receive a beacon signal including an indicator indicating the Overr UL transmission support from the searched AP ( S1150).
- a UE in a region where cellular UL transmission is not possible cannot transmit a RACH (Random Access CHannel) or a RACH preamble through the cellular network. If the UE recognizes that it is an area where the UL UL transmission is impossible, the UE may try to transmit the RACH to check the UL link condition of the cell (S1160).
- the UE determines that the region is a region where UL transmission is not possible for the cell or a region where only DL transmission is possible for the cell (S1170). After confirming this fact, the UE performs an association procedure with the retrieved AP (S1180), and transmits a RACH, RACH preamble, or connect ion establ ishment request message to the AP (S1185).
- the AP delivers the RACH, RACH preamble, or connect ion establ ishment request message received from the UE to the eNB (S1185).
- the response message may be received from the base station eNB of the cell network (S1190).
- the base station (eNB) of the cellar network is an IWE that manages or operates an interworking call between the cellar network and the WiFi network for information on a region where the UL UL transmission of the terminal is impossible.
- S1210 is transmitted to.
- the IWE obtains information on UL non-transmitable regions from a cell base station (eNB) in each cell.
- the IWE may determine whether an AP supports the UL UL transmission by exchanging information on whether the AKAccess Point of the WiFi network supports the UL transmission of the cell (S1220).
- Each AP informs the IWE whether it supports UL transmission to the cell (that is, whether it can transmit the UL signal received from the UE to the eNB), and the IWE acquires this information (S1220).
- a base station (eNB) of a cellular network transmits neighbor AP list information including information on cellular system information, cellular DL transmission support for the AP, or information on whether to support UL UL transmission to a UE in an RRC_Connected state in advance. Can be given (S1230).
- the UE in the RRC.Connected state may receive downlink data from the eNB of the cell network (S1240).
- the UE attempts to transmit the UL data (S1250) and the UL data transmission fails when the UE recognizes that there is a UL transmission support AP in the cell, the UE turns on WiFi and searches for the AP (S1260).
- the terminal may transmit a probe request message to the searched AP (S1270), and may receive a probe response message or a beacon signal including an indicator indicating a UL transmission to the cell as a response to the probe request message (S1275).
- the terminal receives a probe response message or a beacon signal including an indicator indicating cell UL transmission support from the AP it may be confirmed that the UE is in an area where the UL transmission is not possible from the eNB (S1280). .
- the UE After confirming this fact, the UE performs an association procedure with the searched AP (S1285), and can directly receive downlink data from the eNB (S1290), but UL data transmission is performed through the AP.
- the AP transmits the information to the eNB (S1295).
- a terminal capable of simultaneously accessing a celller and Wi-Fi enters an area capable of only a DL DL transmission or a UL UL transmission
- corresponding cell information is available through the cell system information.
- the eNB when the eNB transmits AP list information belonging to a cell, whether or not a link is supported for each AP for each AP (for example, support for supporting a DL DL or supporting a cell UL transmission) ) Can be sent along with the indicator.
- the indicator may be set to 1 bit size.
- the terminal Upon entering the cell in which the indication indicating whether the cellular link is supported is set, the terminal may first search for Wi—Fi to recover the radio link when the cell detects a DL or UL link problem.
- the AP list information may be a message type for transmitting neighbor AP informat ion information as a broadcast message or a system information block (SIB) type.
- SIB system information block
- the AP transmits a Cel lular capabi li ty in its beacon message.
- the element may be defined and included and transmitted to the terminal.
- the Cel lular capability element may include an indicator indicating whether the cell supports the DL transmission support or the cellular UL transmission.
- the DL radio link quality is continuously measured, and when a continuous out-of-sync is detected from the physical layer that does not exceed a predetermined threshold Qout, it indicates a radio link problem. do.
- the terminal when the terminal detects that the link state of the DL or UL is not good, the terminal enters a radio link failure (RLF).
- RLF radio link failure
- a terminal in an environment in which cell DL transmission is not possible needs to be prevented from entering a radio link failure using only DL radio link quality as in the prior art.
- FIG. 13 is an exemplary diagram for explaining a method of entering a radio link failure which improves the problems of the conventional LTE system scheme.
- a method of restoring a DL or UL link through WiFi may be defined. That is, as described above with reference to FIGS. 6 to 12, in the case of a problem with the DL or UL link or a situation, a procedure for recovering the DL or UL link through WiFi during the f i rst phase may be performed.
- the UE may instruct the cell to continue transmission for the UL or DL even if the cell goes to the radio problem detection step for the DL or UL transmission.
- the UE in the R C_Connected state it operates as a normal operat ion and detects a problem in the radio link.
- the UE detects a DL link problem, the UE notifies it through the UL link, and the UE searches for a DL transmission support AP by previously receiving a cell and establishes a connection.
- the terminal When the terminal detects a UL link problem, the terminal continuously monitors data received through the DL link. When the signal strength of the received data exceeds a threshold Qin, the UE searches for a UL transmission supported AP through a previously received cell and establishes a connection.
- FIG. 14 is another exemplary diagram for describing a sal search procedure according to movement of a terminal in a situation where only UL UL transmission is possible.
- a base station (eNB) of a cellar network may manage or operate an interworking between the cellar network and a WiFi network with information about a region where the eNB cannot perform DL transmission. Transmit to IWE (S1410).
- the IWE obtains information on the region where the DL can not be transmitted from the base station (eNB) in each cell.
- the IWE exchanges information on whether the AKAccess Point of the WiFi network supports DL transmission with the cell and can determine whether an AP supports DL transmission with the cell (S1420).
- Each AP informs the IWE whether it supports DL transmission to the cell (that is, whether it can deliver the DL signal received from the eNB to the UE), and the IWE acquires this information (S1420).
- the base station (eNB) of the Seller network may transmit neighboring AP list information including information on cell system information, support for cell DL transmission to the AP, or information on support for cell UL transmission to the UE in RRC_Connected state in advance. (S1430).
- the UE cannot receive downlink data directly from the eNB because the UE is located in an area where the cell cannot transmit DL (S1440).
- the terminal in the RRC_Connected state determines that the quality of the DL signal of the base station eNB of the cell network is less than or equal to a predetermined threshold for a predetermined number of consecutive times (for example, a predetermined number of consecutive DL out-of ⁇ ). sync)), if there is an AP supporting the DL transmission in the cell, the WiFi is turned on and the AP is searched (S1450).
- the terminal transmits a probe request message to the discovered AP (S1460), and a probe response message including an indicator indicating a DL transmission as a response to the probe request message;
- a beacon signal may be received from the AP (S1470).
- the UE When the UE receives a probe response message or a beacon signal including an indicator indicating support for transmitting DL DL from the AP, it may be confirmed that the UE is in an area where it is impossible to receive DL DL from the eNB (S1475). .
- the UE may transmit a content indicating that the DL signal is to be received through the AP to the eNB through the UL link (S1480). That is, the UE informs that it is difficult to receive DL from the eNB but does not enter RRL, but receives data through WiFi (S1480). Thereafter, the UE may perform an association procedure with the AP in order to receive DL transmission from the cell (S1485). Thereafter, the terminal receives the DL DL data or the cellular system information from the AP (S1490). In operation S1495, the UE may directly transmit UL data to the eNB using the cell UL link.
- 15 is another exemplary view for explaining a procedure for establishing a UL link to WiFi according to the movement of a terminal in a situation where only DL DL transmission is possible.
- the base station (eNB) of the Overr network is an IWE that manages or operates interworking between the celller network and the WiFi network for information on a region where the UL UL of the terminal cannot be transmitted.
- S1510 is transmitted to.
- the IWE obtains information on UL non-transmitable regions from a cell base station (eNB) in each cell.
- the IWE exchanges information on whether the AP supports the UL UL transmission with the AP (Access Point) of the WiFi network, and may determine whether the AP supports UL transmission through the cell (S1520).
- Each AP informs the IWE whether it supports UL transmission to the cell (that is, whether it can transmit the UL signal received from the UE to the eNB), and the IWE acquires this information (S1520).
- a base station (eNB) of a cellar network transmits neighbor AP list information including information on a Byr system information, support for a DL DL for a AP, or support for a saluler UL transmission to a terminal in an RRC_Connected state in advance. Can be given (S1530).
- the UE in the RRC_Connected state may receive downlink data from the base station eNB of the cell network (S1540).
- the UE attempts to transmit UL data (S1550) and recognizes that there is a cell transmitting UL UL support AP in the corresponding cell when the UL data transmission fails, the UE turns on WiFi and searches for an AP (S1560).
- the terminal transmits a probe request message to the discovered AP (S1565), for the probe request message
- a probe answer message or a beacon signal including an indicator indicating a UL transmission may be received from the AP (S1570).
- the terminal receives a probe answer message or a beacon signal including an indicator indicating cell UL transmission support from the AP, it may be confirmed that the UE is in an area where the UL transmission is not possible from the base station ( e NB) (S1580). ). The UE determines that UL transmission through the UL link is difficult but does not enter RRL, but transmits UL data through WiFi (S1580).
- the UE After confirming this fact, the UE performs an association procedure with the retrieved AP (S1585), and can directly receive downlink data from the eNB (S1590), but UL data transmission is performed by the AP. After that, the AP delivers the information to the eNB (S1595).
- a terminal capable of simultaneously accessing a WLAN (WiFi) and a cellular network may perform a peripheral Wi-Fi system in a situation where DL reception or UL transmission of the cellular network is difficult.
- Wi-Fi Wireless Fidelity
- the communication performance can be significantly improved.
- Embodiments described above are those in which the components and features of the present invention are combined in a predetermined form. Each component or feature is to be considered optional unless stated otherwise. Each component or feature may be embodied in a form that is not combined with other components or features. It is also possible to combine some of the components and / or features to form an embodiment of the invention. The order of the operations described in the embodiments of the present invention may be changed. Some configurations or features of one embodiment may be included in another embodiment or may be substituted for components or features of another embodiment. It is obvious that the claims may be combined to form an embodiment by combining claims that do not have an explicit citation relationship in the claims or as new claims by post-application correction.
- a method for transmitting an uplink signal in a communication environment in which a plurality of communication systems is interworked can be used industrially in a wireless communication system such as 3GPP LTE-A.
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KR1020167011525A KR101754671B1 (ko) | 2013-11-15 | 2014-07-09 | 복수의 통신시스템이 연동되는 통신 환경에서 신호를 전송 및 수신하는 방법과 이를 위한 장치 |
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US10419969B2 (en) * | 2014-11-06 | 2019-09-17 | Nokia Solutions And Networks Oy | Interface functionality for RAN-WLAN radio aggregation |
JP6870987B2 (ja) * | 2014-11-07 | 2021-05-12 | 京セラ株式会社 | 基幹ネットワーク装置、無線端末、及び基地局 |
US9936524B2 (en) * | 2014-12-24 | 2018-04-03 | Intel Corporation | Random access procedure for handover |
US9820331B1 (en) * | 2015-02-11 | 2017-11-14 | Sprint Spectrum L.P. | UE-context release in response to failure of air interface communication |
EP3254520B1 (en) * | 2015-03-03 | 2020-10-21 | Huawei Technologies Co. Ltd. | Device, node and methods in a wireless communication network |
US10917164B2 (en) * | 2016-11-10 | 2021-02-09 | Cable Television Laboratories, Inc. | Systems and methods for ultra reliable low latency communications |
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Also Published As
Publication number | Publication date |
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KR20160075549A (ko) | 2016-06-29 |
KR101754671B1 (ko) | 2017-07-10 |
US10075904B2 (en) | 2018-09-11 |
US20160286470A1 (en) | 2016-09-29 |
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