WO2016114425A1 - Procédé de retransmission de données dans un réseau reliant une pluralité de systèmes de communication et appareil associé - Google Patents

Procédé de retransmission de données dans un réseau reliant une pluralité de systèmes de communication et appareil associé Download PDF

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Publication number
WO2016114425A1
WO2016114425A1 PCT/KR2015/000376 KR2015000376W WO2016114425A1 WO 2016114425 A1 WO2016114425 A1 WO 2016114425A1 KR 2015000376 W KR2015000376 W KR 2015000376W WO 2016114425 A1 WO2016114425 A1 WO 2016114425A1
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WIPO (PCT)
Prior art keywords
communication system
base station
data
downlink data
network
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PCT/KR2015/000376
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English (en)
Korean (ko)
Inventor
최혜영
조희정
고현수
변일무
박경민
Original Assignee
엘지전자 주식회사
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Priority to PCT/KR2015/000376 priority Critical patent/WO2016114425A1/fr
Publication of WO2016114425A1 publication Critical patent/WO2016114425A1/fr

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    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04W—WIRELESS COMMUNICATION NETWORKS
    • H04W28/00—Network traffic management; Network resource management
    • H04W28/02—Traffic management, e.g. flow control or congestion control
    • H04W28/04—Error control
    • 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
    • H04W88/08—Access point devices

Definitions

  • the present invention relates to wireless communication, and more particularly, to a method and apparatus for retransmitting data in a network interworking with a plurality of communication systems.
  • a Mult i-RAT terminal having a capability of accessing two or more radio access technologies (RAT) or black communication systems in a wireless communication system.
  • RAT radio access technologies
  • a connection ion is set to a specific RAT based on a terminal request and data transmission and reception are performed.
  • the Mult i-RAT terminal is able to access more than one RAT, it was not possible to simultaneously access the mult iple RAT. That is, even if there is a Mult i-RAT capabi l i ty, the current UE cannot simultaneously transmit and receive data through different RATs.
  • the technical problem to be achieved in the present invention is to provide a method for retransmitting data by the base station of the first communication system in a network interworking with a plurality of communication systems.
  • Another object of the present invention is to provide a base station of a first communication system for retransmitting data in a network interworking with a plurality of communication systems.
  • the method for retransmitting data by the base station of the first communication system in a network interworking with a plurality of communication systems for achieving the above technical problem the data between the base station of the first communication system and the base station of the second communication system Transmitting information related to retransmission of downlink data to be transmitted by using a bearer branched to a radio level for transmission and reception to a base station of the second communication system;
  • the information related to the retransmission of the downlink data to be transmitted using the bearer branched to the radio level indicates that the base station of the first communication system performs retransmission, an acknowledgment answer for the indication is sent to the second communication system.
  • the condition to perform the retransmission in the system may include the number of retransmission of the downlink data of the base station of the second communication system. .
  • the predetermined condition may include receiving a message for requesting retransmission of the downlink data from a base station of the second communication system.
  • the case where the predetermined condition is satisfied may include a case in which an ACK signal for the downlink data is not received until the timer started while transmitting the downlink data to the second communication system expires.
  • the message may include a sequence number of the downlink data.
  • the message may be received from the base station of the second communication system when the second communication system retransmits the downlink data a predetermined number of times but the terminal does not receive it successfully.
  • the first communication system is a seller communication system and the second communication system is a wireless local area network (WLAN) communication system.
  • WLAN wireless local area network
  • a base station of a first communication system for retransmitting data in a network interworking with a plurality of communication systems includes data between a base station of the first communication system and a base station of a second communication system.
  • a transmitter configured to transmit information related to retransmission of downlink data to be transmitted using a bearer branched to a radio level for transmission and reception to a base station of the second communication system;
  • the acknowledgment of the indication is sent to the second communication system.
  • a receiver configured to receive from a base station;
  • the transmitter may be configured to transmit downlink data to a base station of the second communication system based on the acknowledgment answer, and include a processor for controlling the transmitter to retransmit the downlink data to a terminal when a predetermined condition is satisfied.
  • a predetermined condition it may include receiving a message for requesting retransmission of the downlink data from a base station of the second communication system.
  • the predetermined condition is satisfied, the downlink until the timer started while transmitting the downlink data to the second communication system expires. It may include a case in which an ACK signal for data is not received.
  • the message may include a sequence number of the downlink data.
  • the first communication system is a seller communication system and the second communication system is a WLAN communication system.
  • the message may include a sequence number of the downlink data.
  • 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 a diagram illustrating a network structure of an Evolved Universal Mobile Telecom Systems (E-UMTS).
  • E-UMTS Evolved Universal Mobile Telecom Systems
  • FIG. 3 is a diagram illustrating a network structure for explaining an interworking structure between a first communication system (eg, a cellar communication system) and a second communication system (eg, a wireless LAN communication system).
  • a first communication system eg, a cellar communication system
  • a second communication system eg, a wireless LAN communication system
  • FIG. 4 is an exemplary diagram for explaining a concept of security in a LTE / LTE-A system.
  • FIG. 5 is a diagram illustrating Reassociat ion Procedures in an IEEE 802.11 WLAN system.
  • FIG. 6 is a diagram illustrating examples of a structure of a WiFi-Cel lular converged communication system.
  • FIG. 7 is a diagram illustrating examples without bearer splitting as radio level integrat ion-radio protocol architectures.
  • FIG. 8 is a diagram illustrating examples of bearer split as radio level integrat ion-radio protocol architectures.
  • FIG. 9 is a diagram illustrating an example of a retransmission procedure according to the present invention.
  • FIG. 10 is a diagram illustrating a procedure in the case where the AP determines a reseller transmission.
  • FIG. 11 is a diagram illustrating a procedure when an eNB of a celler network determines retransmission.
  • FIG. 12 shows fast salar data in salar-WLAN converged networks. Illustrates a procedure for the transmission.
  • FIG. 13 is a procedure for fast cellular data transmission in a celller-WLAN converged network according to FIG. 12 and is a procedure for an AP transmitting data within a specific time.
  • FIG. 14 is a procedure for fast cellular data transmission in the celller-WLAN converged network according to FIG. 12, when the AP fails to transmit data within a specific time.
  • FIG. 15 is an exemplary diagram for describing a method of adjusting a data transmission rate in a cellular-WLAN converged network.
  • a terminal collectively refers to a mobile or fixed user terminal device such as UE Jser Equipment (MSJ), MSCMobi le Stat ion (AMS), AMS (Advanced Mobi le Stat ion), or STA.
  • the base station collectively refers to any node of the network terminal that communicates with the terminal such as Node B, eNode B, Base Stat ion, and Access Point (AP).
  • Node B eNode B
  • AP Access Point
  • a user equipment may receive information from a base station through downlink ink, and the terminal may also transmit information through uplink ink.
  • 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.
  • CDMA code division mult iple access
  • FDMA frequency division mult iple access
  • TDMA time division mult iple access
  • OFDMA orthogonal frequency division mul t iple access
  • SC-FDMA SC-FDMA It can be used in various wireless access systems such as single carrier frequency division mult iple access.
  • CDMA may be implemented by radio technology such as UTRACUniversal Terrestrial Radio Access) or CDMA2000.
  • TDMA can be implemented with wireless technologies such as Global System for Mobility Communications (GSM) / General Packet Radio Service (GPRS) / Enhanced Data Rates for GSM Evolut ion (EDGE).
  • GSM Global System for Mobility Communications
  • GPRS General Packet Radio Service
  • EDGE Enhanced Data Rates for GSM Evolut ion
  • 0FDMA may be implemented with a radio technology such as IEEE 802.11 (Wi-Fi), IEEE 802.16 (WiMAX), IEEE 802-20, E-UTRAC Evolved UTRA (etc.).
  • UTRA is part of the UMTSOJniversal Mobile Telecommuni- cation Systems.
  • 3GPP (3rd Generat ion Partnership Project) LTEdong term evolut ion 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 may include one or more base stations and / Or it may include one or more terminals.
  • 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. And a receiver 190, a symbol demodulator 195, and a receive data processor 197.
  • the terminal 110 includes a transmit (Tx) data processor 165, a symbol tuner 175, a transmitter 175, a transmit / receive antenna 135, a processor 155, a memory 160, a receiver 140, A symbol demodulator 145 and a receive data processor 150 may be included.
  • 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 multiple iple input multiple output (MIMO) system. In addition, the base station 105 according to the present invention may support both a single user MIMO (MU-MUMO) MU ⁇ MUL (Mult i User-MIMO) scheme.
  • MU-MUMO single user MIMO
  • MU ⁇ MUL Modult i User-MIMO
  • the transmit data processor 115 receives the traffic data, formats the received traffic data, codes it, interleaves and modulates (or symbol 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 are frequency division multiplexed (FDM), orthogonal frequency division It may be a multiplexing (OFDM), time division multiplexing (TDM), or code division multiplexing (CDM) symbol.
  • FDM frequency division multiplexed
  • OFDM orthogonal frequency division It
  • 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 upconverts) these analog signals. As a result, a downlink signal suitable for transmission over a wireless channel is generated, and then the transmitting antenna 130 transmits the generated downlink signal to the terminal.
  • the receiving antenna 135 receives the downlink signal from the base station and provides the received signal to the receiver 140.
  • Receiver 140 adjusts the received signal (eg, filters, amplifies, and frequency downconverts), and digitizes the adjusted signal to obtain samples.
  • Symbol demodulator 145 receives received pilot symbols. Demodulate the signals to provide 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 demaps), deinterleaves, and decodes the data symbol estimates to recover the transmitted traffic data.
  • the processing by the symbol demodulator 145 and the receiving data processor 150 are complementary to the processing by the symbol modulator 120 and the transmitting data processor 115 at the base station 105, respectively.
  • the terminal 110 is on the uplink, the transmit data processor 165 processes the traffic data to provide 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.
  • the uplink signal from the terminal 110 to the receiving antenna 130 Received through the receiver, 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.
  • processor (155, 180) is a multiple controller, (control ler), multiple micro-controller (microcontrol ler), a microprocessor (microprocessor), a microcomputer (microcomputer) or the like can also be referred to.
  • the processors 155 and 180 may be implemented by hardware or firmware (fir 'are), software, or a combination thereof.
  • ASICs applicat ion speci fic integrated circuits
  • DSPs digital signal processors
  • DSPDs digital signal processing devices
  • PLDs Programmable logic devices
  • FPGAs gate programmable gate arrays
  • firmware or software may be configured to include modules, procedures, or functions for performing the functions or operations of the present invention.
  • Firmware or software configured to perform the above may be provided in 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 radio communication system are based on the lower three layers of the OSKopen system interconnect ion model, which are well known in the communication system.
  • L2 and the third layer L3.
  • the physical layer belongs to the first layer and provides an information transmission service through a physical channel.
  • RRC (Radio Resource Control) layer belongs to the third layer and provides control radio resources between the UE and the network.
  • the terminal and the base station may exchange RRC messages through the wireless communication network and the RRC layer.
  • the processor 155 of the terminal and the processor 180 of the base station process signals and data except for a function of receiving or transmitting a signal and a storing function of the terminal 110 and the base station 105, respectively.
  • the processor 155 and 180 will not be specifically described below.
  • a series of operations of the data processing round are performed instead of the function of receiving or transmitting a signal and a storage function.
  • E-UMTS Evolved Universal Mobile Telecom Systems
  • the E-UMTS may be called like an LTE system.
  • the system may be widely deployed to provide various communication services, such as voice ALV packet data, and is generally configured to function based on various techniques to be described and described in detail with reference to the following figures.
  • the E-UMTS network includes an Evolved UMTS terrestrial radio access network (E-UTRAN), an Evolved Packet Core (EPC), and one or more terminals.
  • the E-UTRAN includes one or more base stations.
  • the E / SAE gateway provides the endpoint's endpoint and mobility management functionality for the terminal.
  • the base station and the MME / SAE gateway may be connected via the S1 interface.
  • a base station is generally a fixed station that communicates with the terminal.
  • a base station may also be called an access point (AP).
  • the base station provides end points of a user plane and a control plane to the terminal.
  • a plurality of terminals may be located in one cell.
  • One base station is generally arranged per cell.
  • An interface for transmitting user traffic or control traffic may be used between the base stations.
  • downl ink refers to communication from a base station to a terminal
  • upl ink refers to communication from a terminal to a base station.
  • the MME / SAE gateway provides ciphering and integrity of distribution of paging messages to base stations, security control of idle ion mobility control, SAR bearer control and non-access stratum (NAS) signaling. It provides various functions including protect ion.
  • the SAE gateway provides several functions including the termination of U-plan packets for paging reasons, the switching of the U-plan to support terminal mobility.
  • the MME / SAE gateway 30 may be referred to herein simply as a "gateway.” However, it can be understood that this structure may include both the E gateway and the SAE gateway.
  • a plurality of nodes may be connected between the base station and the gateway through the S1 interface.
  • Base stations may be connected to each other via an X2 interface, and neighboring base stations may have a meshed network structure 3 ⁇ 4 with an X2 interface.
  • FIG. 3 is a diagram illustrating a network structure for explaining an interworking structure between a first communication system (eg, a seller communication system) and a second communication system (eg, a wireless LAN communication system).
  • a first communication system eg, a seller communication system
  • a second communication system eg, a wireless LAN communication system
  • an LTE / LTE-A system as an example of the first communication system and a WiFi system as an example of the second communication system will be described.
  • a backhaul control connect ion is established between the AP and the eNB through a backbone network (for example, P-GW or EPC (Evoed Packet Core)). Or, there may be a wireless control connect ion between the AP and the eNB.
  • the UE uses a first wireless communication scheme (eg, LTE / LTE-A) through interworking between a plurality of communication networks. ) Can simultaneously support both a first communication system (or a first communication network) and a second communication system (eg, WiFi) using a second wireless communication scheme (eg, WiFi).
  • 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 One system may be referred to as a secondary network or a secondary system, respectively.
  • the UE may be configured to simultaneously support LTE / LTE-A and WiFi (local area communication system such as WLAN / 802. 11).
  • LTE / LTE-A local area communication system such as WLAN / 802. 11
  • MUL multi-system support 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 an LTE / LTE-A system.
  • the secondary system is a network having a small coverage and may be a system for data transmission.
  • the secondary network may be, for example, a WLAN system such as WLAN or WiFi.
  • the AP which is the access point of the secondary system (e.g., WiFi), and the base station (eNB), which is the access point of the primary system (e.g., cellular communication system, such as LTE / LTE-A system), Assume that a connection (connect i on) is established.
  • the AP having a radio interface with the eNB should support not only 802.11 MAC / PHY, but also LTE protocol stack or WiMAX protocol stack for communication with the eNB, and serves as a terminal with the e NB and communicates with the eNB. can do.
  • FIG. 4 is an exemplary diagram for explaining a concept of security in an LTE / LTE-A system.
  • the HSS sends an authentication vector composed of ⁇ RAND, XRES, AUTH HSS , K ASME ⁇ to the MME, and the MME performs mutual authentication with the UE.
  • the MME stores the authentication vector and sends the RAND and AUTN HSS values to the UE.
  • the UE generates the RES, AUTNUE, and K ASME using the AKA algorithm, and then sends the RES values to the E. .
  • the UE authenticates the network by comparing the AUTNUE value generated by the UE with the AUTNRSS value received from the E, and the MME authenticates the user by comparing the XRES received from the HSS with the RES received from the UE.
  • the UE and the MME share the KASME.
  • Security relations between two UEs are defined between UE (UE) and E-UTRAN or CN (Core Network), and the first layer is described as AS (Access Stratum), which is used for RRC signaling between user and base station.
  • AS Access Stratum
  • Protect UP User Plane
  • the second layer is described as non-access stratum (NAS), which protects CP (Control Plane) signaling between the user and the MME.
  • the UE and the MME After mutual authentication and sharing the K ASME , the UE and the MME perform a NAS Securi ty Setup procedure for generating a NAS security key.
  • the NAS Security Set up is performed through a Security Mode Command I Security Mode Complete message, which is a NAS signaling message, and is initiated by the MME sending a Security Mode Co ⁇ and message to the UE.
  • the MME selects the NAS Securi ty algorithm and then obtains the integrity key ⁇ and the encryption key K NASenc from K ASME . Thereafter, a Security Mode Command message including a NAS message authentication code (NAS-MAC) generated using the selected integrity and encryption algorithm and K NAS i nt is transmitted to the UE.
  • NAS-MAC NAS message authentication code
  • the UE After receiving the Securi ty Mode Co. and message, the UE checks the integrity of the received message using a NAS Security algorithm selected by the MME and generates NAS Securi ty keys ( ⁇ and K NASenc ). Afterwards, NAS Security Setup is completed by sending the message Securi ty Command Complete to E. The Security Mode Complete message is encrypted using 11 ⁇ 2 and transmitted with the message authentication code NAS-MAC generated with ⁇ . After completing NAS Security Setup, NAS signaling messages between UE and E are transmitted with integrity check and encryption.
  • NAS Security algorithm selected by the MME and generates NAS Securi ty keys ( ⁇ and K NASenc ).
  • NAS Security Setup is completed by sending the message Securi ty Command Complete to E.
  • the Security Mode Complete message is encrypted using 11 ⁇ 2 and transmitted with the message authentication code NAS-MAC generated with ⁇ .
  • NAS signaling messages between UE and E are transmitted with integrity check and encryption.
  • the UE (UE) and MME that have completed mutual authentication calculate K eNB from K ASME and ⁇ E transmits it to eNB so that UE (UE) and eNB perform AS Security Setup procedure for AS Securi key generation. Perform.
  • AS Securi ty Setup is done through Security Mode Command I Securi ty Mode Complete message, which is an RRC signaling message.
  • the eNB starts by sending a Security Mode Co ⁇ and message to the UE.
  • the eNB obtains an integrity key 11 ⁇ 2 (; ⁇ and an encryption key 11 ⁇ 2 (:) to use for the RRC signaling message from the AS Security algorithm, and then obtains the encryption key K UPenc to be used in the user plane. And a Security Mode Command message including a Message Authentication Code for Integrity (MAC-I) generated using the IR C i nt to the UE.
  • MAC-I Message Authentication Code for Integrity
  • the UE After receiving the Security Mode Command message from the eNB, the UE checks the integrity of the received message using the AS Security algorithm selected by the eNB and generates AS Security keys (KRR Cint , l menc , jp enc ). do. After that, the AS Security Setup is completed by sending a Security Command Complete message to the eNB. This Security Mode Complete message is sent with the message authentication code MAC-I created using KRR C nt . After completing the AS Security Setup, the RRC signaling message between the UE and the eNB performs integrity check and encryption, and user plane data is transmitted with encryption.
  • connection ion procedures of the IEEE 802.11 WLAN system will be described.
  • the scanning step is divided into passive scanning and active scanning, and the terminal (for example, the STA) searches for the neighbor AP in the scanning step to store information, receives a beacon frame of the neighbor AP, and Send and receive probes and probe response frames.
  • the UE selects and synchronizes an AP among the discovered neighbor APs and collects information on the AP. Then, a beacon frame of the selected AP is received.
  • the terminal is authenticated. In the open system authentication procedure, the AP performs authentication unconditionally upon the authentication request of the terminal, and the Shared Key authentication procedure performs authentication by confirming the shared secret key. Send and receive an authentication frame.
  • the terminal is assigned an Association IDGdentif ier) through the Association Response frame, and transmits and receives an Association Request and Response frame.
  • FIG. 5 illustrates reassociation procedures in an IEEE 802.11 WLAN system. Illustrated drawing.
  • Reassociation occurs when a terminal (STA) moves to another AP coverage.
  • a terminal (STA) transmits information on a medium access control (MAC) address of a current AP to a new AP through a reassociation request frame.
  • IAPP Inter-AP Protocol
  • the new AP requests the IAPP to relay the information of the old AP, and the old AP deletes the AIDCAssociation Id) of the terminal.
  • IAPP (Inter-AP Protocol) 802.11f is a protocol for exchanging context between APs through a DS in a wireless local area network (WLAN) system, which caches the PMK information exchanged by the AP and the terminal's key used by the old AP.
  • WLAN wireless local area network
  • Disassociation Procedures of IEEE 802.11 WLAN will be briefly described. Disassociation is a notification, not a request.
  • the AP needs to disassociate the terminals (STAs) to enable the AP to be removed from the network for service or for other reasons.
  • STAs terminals
  • the STAs attempt to disassociate. Transmit a disassociation frame, which contains a reason code.
  • Beacon frame Although transmitted periodically only in the AP, if the channel is busy at the time to be transmitted, transmission may be delayed.
  • the frame control includes Duration, DA, SA, BSSID, Fragment number, Sequence information, and the frame body includes Time stamp, beacon interval, capability information, ⁇ SSID, Supported rates, DS parameter Set, TIM ⁇ IEs.
  • TIM is used as an indication (AID indication) to wake up a UE in Traffic Indication MAP, Doze mode.
  • Probe request frame used in active scanning.
  • the frame body contains ⁇ SSID, Supported Rates ⁇ IEs.
  • Probe response frame It is sent with a male answer to the probe.
  • Frame control includes Duration, DA, SA, BSSID, fragment number, Sequence, and frame body includes Time stamp, beacon interval, capability information, ⁇ SSID, supported rate, DS parameter Set ⁇ IEs.
  • Authentication frame Used for authentication request and ques- tion, it is divided into Authentication transaction Sequence because the format is same.
  • Frame contr contains Duration, DA, SA, BSSID, Fragment number, Sequence, and Frame body contains Authentication Algorithm Number, Status code, Challenge text IE.
  • Authentication Algorithm Number Open System, Shared Key, Fast BSS Transition
  • Association request frame Contains a listen interval that specifies how long to stay in the association request ⁇ 1 power saving mode.
  • Frame contr contains Duration, DA, SA, BSSID, Fragment number, Sequence, and Frame body contains Capability information, Listen Interval, ⁇ SSID, Supported Rates ⁇ IEs.
  • Association response frame A response to the Associa ion request is transmitted and assigned an AID value.
  • Frame control includes Duration, DA, SA, BSSID, fragment number, Sequence, and frame body contains Capability information, Status Code, Association ID, Supported rates IE.
  • Reassociation request frame Includes a listen interval that specifies how long to stay in power saving mode when requesting reassociation.
  • Frame control includes Duration, DA, SA, BSSID, Fragment number, Sequence, and frame body contains Capability information, Listen Interval, Current AP address, ⁇ SSID, Supported Rates ⁇ IEs.
  • Reassociation response frame The same frame as the Association response frame is used and an AID value to be used in the new AP is allocated.
  • Frame contr includes Duration, DA, SA, BSSID, fragment number, Sequence, Frame body is Capability Informat ion, Status Code, Associat ion ID, and Supported rates IE.
  • Frame contr in the disassociat ion / Deauthent icat ion frame includes Durat ion, DA, SA, SSID IE, fragment number, Sequence, and frame body contains Reason Code.
  • the above description of the IEEE 802.11 WLAN can be applied in the context of the present invention.
  • Conventional inter RAT technology is designed based on the request of the terminal, does not require interworking between the WLAN and the cellular network, the specific network server manages the WLAN information, and inter- Enable RAT handover.
  • the UE can simultaneously access the Mult iple RAT, it is possible to simultaneously access the Mult iple RAT by supporting only f low mobi 1ity / IP-f low mapping at the control network level at the radio level. It was. For this reason, the prior art did not require any control connection between the AP and the salar network, and allowed to connect to Mul t iple RAT based on the request of the terminal. Such a prior art does not accurately grasp the situation of the network, there is a limit to increase the overall network efficiency by the terminal-oriented RAT selection.
  • Radio level convergence network 1) enabling unified contr and management of the mult i-RAT of the operator, and 2) radio resource management according to real-time channel and load conditions. Improve capacity and QoE, and 3) use reliable cell network as contn) and mobi li anchor to improve QoE, minimize service interrupt ion, and more operators. There are advantages such as control.
  • Radio level convergence networks are available in both col located and non-col located deployments. [092] Through wireless level converged networks, it is easier to support tight ly-coupled management between cell networks and WLANs (for example, WiFi), and transmit delays using characteristics of cell networks and Wi-Fi networks. Procedure steps to reduce (del ay) can be considered.
  • WLANs for example, WiFi
  • Retransmission Delay In the conventional Wi-Fi, retransmission is performed after a backoff time when data transmission fails. At this time, the CW of the backoff is increased exponentially than the conventional one, and since it competes fairly with other STAs, it takes longer to retransmit. In particular, when there are a lot of STAs and a long delay for access, such a retransmission delay may occur seriously. This does not support the quality of service (QoS) requirements of the service and thus does not guarantee the QoS of the terminal. In order to solve this problem, if the data transmitted through the WiFi network fails to transmit, it may be necessary to retransmit the packet more quickly through the Overr network without retransmitting through the WiFi network.
  • QoS quality of service
  • the average rate of data split in the cell network can be determined but the dynamic rate is difficult to determine, so certain data branched to the WLAN There is a need for a method that enables faster transmission through the cellular network in case of delayed transmission. Since the data reception delay can be more accurately understood from the point of view of the receiver receiving the actual data, information about the reception delay when the receiver receives the data in the cell network in order to optimize the data transmission rate and increase the system throughput. Etc. may be necessary.
  • the present invention proposes a method for transmission in a Celler-WiFi (Cel lular / Wi-Fi) wireless level converged network.
  • the present invention proposes a method for faster transmission over a cellular network in which delay occurs or data transmission fails when specific data branched to a WLAN (for example, WiFi) is transmitted through the WLAN.
  • the present invention proposes a method for increasing system throughput by optimizing the mult i-RAT data transmission rate by using a data reception delay of a receiver receiving actual data.
  • FIG. 6 is a diagram illustrating examples of a structure of a WiFi-Cel hilar converged communication system.
  • a WiFi-Cellular converged communication system may include a cellular BS and WiFi APs, and the WiFi APs may be connected to the cellular base station through a core network.
  • a WiFi-Cellular converged communication system includes a cellar base station (eel hilar BS) and WiFi APs, and a wireless access is performed between the cellar base station and the WiFi AP through a radio access network (RAN) interface. This is possible.
  • RAN radio access network
  • a WiFi-Cel hilar converged communication system includes a cellular BS and WiFi APs. Unlike FIG.
  • a WiFi-Cel hilar converged communication system is wirelessly connected to a cellular BS through a wireless access network interface.
  • eAP can access the S ⁇ GW MMEC Mobility Management Entity via a core network interface.
  • the WiFi-Cel lular converged communication system includes a multi-RAT BS supporting both cellular and WiFi communication, the multi-RAT BS can be connected to the S-CT ⁇ E through.
  • Bearer Split refers to the ability to split (or split) a bearer on multiple eNBs, in dual connectivity.
  • the celller or the AP may configure a bearer of the terminal to simultaneously transmit / receive data of one bearer through the Overr and the AP.
  • FIG. 7 is a diagram illustrating examples not bearer split as radio level integration-radio protocol architectures.
  • FIG. 7 illustrates a case in which the eNB does not split a bearer for data to be transmitted to the UE and the AP when transmitting data to the UE and the AP.
  • the AP and the eNB do not have bearers in which data is simultaneously transmitted through respective RATs.
  • Bearers transmitted through the AP in Alt 1 ⁇ 2 Is branched through a higher layer of CN (Core Network) or PDCP (Packet Data Convergence Protocol) to transmit data to the MAC side of the AP, and in Alt 3, the eNB transmits data to the MAC side of the AP through the PDCP layer, In Alt 4, the eNB sends data to the MAC side of the AP via the Radio Link Control (RNC) layer. 2 Send.
  • RNC Radio Link Control
  • an Xn interface between the eNB and the AP needs to be defined.
  • the Xn interface is not needed.
  • the adapt ion layer needs to interwork the LTE protocol and WLAN protocol at each alt.
  • FIG. 8 is a diagram illustrating examples of bearer split as radio level integrat ion-radio protocol architectures.
  • the eNB may additionally configure a bearer for WLAN communication in addition to the bearer for data transmission to the terminal through the cell network. That is, the eNB uses separate bearers for data to be transmitted to the terminal and data to be transmitted to the AP through the cell network.
  • FIG. 8 illustrates a case in which the eNB splits bearers for data to be transmitted to the UE and the AP when the eNB transmits data to the UE and the AP.
  • the eNB has a separate bearer for data to be transmitted to the AP.
  • Al t 5 is the eNB sends data to the MAC layer of the AP through the upper layer of the Packet Data Convergence Protocol (PDCP)
  • Alt 6 is the eNB sends data to the MAC layer of the AP through the Xn interface in the PDCP layer
  • Alt 7 transmits data from the RNC (Radio Link Control) layer of the eNB to the MAC of the AP through the Xn interface
  • Alt 8 transmits data from the MAC layer of the eNB to the MAC terminal of the AP through the Xn interface.
  • PDCP Packet Data Convergence Protocol
  • Alt 7 transmits data from the RNC (Radio Link Control) layer of the eNB to the MAC of the AP through the Xn interface
  • Alt 8 transmits data from the MAC layer of the eNB to the MAC terminal of the AP through the Xn interface.
  • RNC Radio Link Control
  • the terminal when spl it data at the radio level (Radio level), the terminal is not applied in the WLAN (e.g., Wi-Fi), but is applied in the wireless communication system (e.g., LTE)
  • the data security method in the section can be applied, which has the advantage of transmitting / receiving more secure data.
  • a procedure for this is defined.
  • a terminal connected to the Cellular communication system is connected to an AP for radio level split. In this case, the initial connection process can be performed faster.
  • the present invention is assumed that a bearer is split and transmitted to an eNB of a cell network and an AP of a WLAN.
  • the present invention is RUXRadio Link Control () layer shows that data is forked, but this is for convenience and data can be transmitted / received in the PDCP or MAC layer. Therefore, the sequence number referred to in this patent may be a sequence number in RLC or a sequence number in PDCP, and additionally includes a byte number (or a properly received byte number) for retransmission in one packet or RLC SDU. You can also reduce the overhead that can be caused by retransmission units.
  • the following drawings are written in downlink (DL), but this is for convenience and may be equally applicable to uplink (UL) transmission in the terminal.
  • FIG. 9 is a diagram illustrating an example of a retransmission procedure according to the present invention.
  • the eNB of a Larger network may use branched bearers to transmit data to a terminal.
  • the eNB transmits sequence 1 and 4 (in the drawing, only the number of the sequence) to the terminal through a specific bearer through the cell network, and the sequence 2 and 5 is a cell network network. It transmits through but transmits to the terminal through the branched bearer different from the specific bearer.
  • the eNB transmits the sequence 3 to the AP through the branched bearer, and the AP transmits the sequence 3 to the terminal through the WLAN.
  • a retransmission procedure may be performed as shown in the right figure of FIG. 9.
  • the eNB transmits the sequence 6, 9 to the terminal through a specific bearer through the cell network, and the sequence 8 is transmitted through the cell network It transmits to the terminal through the branched bearer different from the specific bearer. In this case, the eNB may retransmit the sequence 3 to the terminal through the branched bearer.
  • the AP may retransmit the cell more quickly through the network without retransmitting the data through the WLAN.
  • eNB is 6, 9 When transmitting the sequence, sequence 7 is also transmitted to the AP through the branched bearer, and the AP transmits the sequence 7 to the terminal.
  • FIG. 10 is a diagram illustrating a procedure when the AP determines a mobile retransmission.
  • an eNB of a Overr network may split a bearer at a radio level to transmit and receive data with an AP, and may configure retransmission related configuration for such a bearer branch configuration (conf igurat ion).
  • conf igurat ion may be transmitted to the AP (S1010).
  • Configuration information related to retransmission of the branched bearer may include the following items 1), 2), and 3).
  • the eNB of the celller network may inform the AP about information on the number of retransmissions through the WLAN network, which is a criterion for performing retransmission from the AP to the celller network.
  • the AP may set the value of the number of retransmissions of data transmitted from the cell network to the maximum number of retransmissions of the AP, or may be independently applied.
  • the eNB of the cellular network may inform the AP of data lifetime information in RLC of the eNB of the cellular network.
  • MAC data lifetime related information can be transmitted from the AP to the eNB.
  • the eNB that receives this may determine the RLC data lifespan of the eNB and transmit information about it to the AP.
  • the AP receiving the RLC data lifetime information from the eNB may set its MAC data lifetime to a value less than or equal to the RLC data lifetime.
  • the AP may transmit a retransmission setup completion woofer message to the eNB when it is determined to set up retransmission with the eNB of the cell network (S1010).
  • the eNB of the cellular network may transmit downlink data to the AP through the branch bearer (S1020), and the AP may transmit the downlink data to the UE (UE) through the WLAN (S1030).
  • the UE sends the downlink data to the AP.
  • An ACK / NACK (Acknowl edgement / Negat i ve Acknowledgement) is transmitted to the AP (S1040).
  • the AP which receives the ACK / NACK signal for the downlink data from the terminal, may determine whether a predetermined condition for retransmission of the downlink data from the eNB to the terminal through the Overr network is satisfied (S1050). .
  • the AP that performs the retransmission related configuration with the cellular network satisfies a predetermined condition, it may determine to retransmit to the eNB of the cellular network. If the AP has retransmitted downlink data through the AP as many times as retransmissions configured by the eNB of the cell network, the next retransmission may determine to perform the cell network.
  • the eNB that has set up retransmission with the eNB of the cell network may determine to retransmit to the eNB of the saler network (without TCP ACK / NACK transmission).
  • the AP may determine to perform retransmission to the eNB of the cellular network based on the load or measured channel state of the AP as the predetermined condition.
  • the AP may determine to perform retransmission through the network when the load of the AP or a channel load report value transmitted by a specific terminal is greater than or equal to a predefined threshold value.
  • the AP may determine to perform retransmission through the cell network when a value of a received signal strength indicat ion (RSSI), which is a state of the measured channel, is equal to or less than a predetermined threshold value.
  • RSSI received signal strength indicat ion
  • the AP may determine to perform retransmission through the cell network.
  • the AP When the AP determines to perform retransmission of downlink data through the Overr network, the AP transmits a retransmission request message requesting retransmission at the RLC or MAC layer of the eNB using an interface between the AP and the eNB. It may be (S1060).
  • This retransmission request message includes a sequence number corresponding to downlink data (RLC PDU (MAC PDU) or MAC PDU), C-RNTI (Cel l Radio Network Temporary Ident if ier) or AID May be included.
  • the eNB receives a retransmission request message from the AP, the eNB performs scheduling for the UE that fails to receive the PDCP PDU, RLC PDU, or MAC PDU of the specific sequence number requested by the AP, and performs DCI (Downl Ink Control). Informat ion) transmits the format. The eNB retransmits the PDCP / RLC / MAC PDU of a specific sequence number to the UE through the Seller network to the resource scheduled for the UE that failed to receive (S1070).
  • DCI Downl Ink Control
  • FIG. 11 is a diagram illustrating a procedure when an eNB of a celler network determines retransmission.
  • the AP is responsible for downlink data transmitted from the terminal to the terminal through the branch bearer.
  • the AP transmitting the data of the bearer branched to the eNB of the Overr network receives an ACK from the receiver or fails to receive the ACK
  • the AP An AP STATUS message including ACK / NACK information may be transmitted to the eNB using an interface between the AP and the eNB (S1150).
  • the AP status message includes an indicator indicating the ACK control, a message length, ⁇ CR TI or AID, a sequence number of downlink data requiring retransmission (eg, Sequence Number 1), the number of times the AP retransmits to the terminal, and the terminal. At least one or more of the ACK / NACK signal received from ⁇ ,
  • the eNB may determine to retransmit (R1X / MAC PDU) at the PDCP / RLC / MAC layer in the PDCP / RLC / MAC layer, which is not properly transmitted through the AP (S1160) ).
  • the information transmitted in the AP status message satisfies a predetermined predetermined condition, it may be decided to retransmit the PDCP / RLC / MAC PDU. For example, when the number of retransmissions is greater than or equal to a predefined threshold value, the eNB of the Overr network may retransmit (S1170).
  • the eNB of the celller network may retransmit.
  • the eNB of the cellular network may remove the PDCP / RLC data when receiving an ACK for a predefined time buffering the PDCP / RLC data.
  • the terminal may request retransmission to the seller network.
  • the terminal receives specific data from the AP exceeding a predefined maximum number of retransmissions That is, when the UE performs the retransmission process with the AP a predetermined number of times, the UE recognizes that the link performance with the AP is poor and transmits an RLC status report to the eNB of the cell network.
  • the eNB of the cell network that receives the RLC status report from the terminal may retransmit specific data requested by the terminal in the RLC status report using the eNB of the cell network.
  • FIG. 12 is a diagram exemplarily illustrating a procedure for fast cell data transmission in a celller-WLAN converged network.
  • the eNB of the Overr network may use branched bearers to transmit data to the terminal. For example, the eNB transmits sequences 1 and 4 (only numbers of sequences in the drawing) to the UE through the bearer network through a specific bearer, and sequences 2 and 5 transmit the cell to the cell network. Transmit through the branched bearer different from the specific bearer to the terminal. Then, the eNB transmits the sequence 3 to the AP through the branched bearer, and the AP transmits the sequence 3 to the terminal through the WLAN.
  • the eNB may start a predetermined timer while transmitting downlink data corresponding to the third sequence to the AP.
  • a retransmission procedure may be performed as shown in the right figure of FIG. 12. 12 is the same as the description of the right figure described with reference to FIG. 9 and will be omitted.
  • FIG. 13 is a procedure for fast cell-seller data transmission in a Overr-WLAN converged network according to FIG. 12, and is a procedure for an AP transmitting data within a specific time.
  • step S1320 unlike the S1120, the eNB starts a predetermined timer while transmitting downlink data (downlink data for a specific sequence number) to the AP.
  • the AP sends a downlink transmission ACK message to the eNB when the AP transmits downlink data to the UE or receives ACK information indicating that the downlink data has been successfully received from the UE. It transmits (S1350).
  • the downlink transmission ACK message may reuse the aforementioned format of the AP status message. In other words, the downlink transmission ACK message may include information included in the aforementioned AP status message.
  • the eNB stops the timer when an ACK for downlink data of a specific sequence number is transmitted in a downlink transmission ACK message received from the AP.
  • FIG. 14 is a procedure for fast cell-seller data transmission in the cell-seller WLAN converged network according to FIG. 12 for a case where an AP fails to transmit data within a specific time.
  • the AP cannot transmit data of a specific sequence number of the branched bearer transmitted from the cell network to the UE. If the eNB does not receive the downlink data transmission ACK message, the eNB may transmit data of the specific sequence number to the UE.
  • the contents of S1410 to S1420 are the same as the contents of S1010 to S1020 and are omitted.
  • 13 and 14 show that the AP transmits the same downlink transmission ACK message when the AP transmits data to the UE or when the AP indicates ACK information indicating that the UE successfully received downlink data. It may also be defined as a message that distinguishes each case. For example, a DL transmission indication message indicating that the AP has transmitted downlink data to the UE may be newly defined, and the downlink transmission indication message may include a sequence of the last transmitted data. Numbers may be included.
  • the eNB of the cell network network When the eNB of the cell network network decides to transmit downlink data to the AP and transmits downlink data to the AP, and the AP transmits the downlink data for a specific terminal, the eNB of the cell network network Notifying the AP of this fact may prevent the AP from transmitting duplicate data to the UE. To this end, the eNB of the cellular network may transmit a data discard request message for discarding duplicate data to the AP (S1440). In this data discard request message, the e NB of the cell network is transmitted for a specific terminal. The sequence number of the data may be included. Upon receipt of this, the AP discards data with the same sequence number.
  • the AP may start a timer and transmit a downlink transmission request message to the e NB of the cell when the specific data transmission is not transmitted for a predetermined time in a buffer.
  • the eNB of the cell network may transmit the sequence number data transmitted in the downlink transmission request message to a specific terminal.
  • a voice response message indicating that the eNB of the cell network has transmitted data for a specific UE may be transmitted to the AP.
  • the AP receiving the ACK answer message may discard the sequence number data included in the downlink transmission request message.
  • the duplicated data may be discarded by using a conventional duplicate detect ion method.
  • 15 is an exemplary diagram for explaining a method of adjusting a data transmission rate in a Overr-WLAN converged network.
  • the Byr network determines the ratio of the cellular network and the WLAN branch data in consideration of the load and channel state of each RAT.
  • the reception delay since the data reception delay can be more accurately understood from the receiver side that actually received the data, in order to optimize the data transmission rate and increase the system throughput, the reception delay when the receiver side receives the data from the cell network. Information may be needed.
  • a receiving side For example, a terminal
  • data received from a specific RAT may be rearranged.
  • the receiving side e.g., the UE
  • the receiving side may perform data transmission or data received from a specific RAT for a specific time when the time taken to reorder data received from the specific RAT in a RLC exceeds a predefined threshold value.
  • Information on the sum of reordering time values or a ratio with a specific time (for example, a ratio between T1 and T2) may be transmitted to a transmitting side (for example, eNB and AP). For example, as shown in FIG. 15, T1, which is a time taken to rearrange a specific MAC / RLC PDU, is .
  • a split rate control message may be transmitted to the eNB of the cell network.
  • a message indicator indicating that it is a branch rate control message
  • a RAT indicator indicating a specific RAT for which the branch rate needs to be controlled
  • the receiving side may determine the sum of rearrangement times of data received from a specific RAT (eg, T1 + T2) or a ratio of rearrangement times (for a specific T time). For example, the ratio between T1 and T2) can be periodically transmitted to the transmitting side and enjoyed.
  • a message indicator indicating that it is a branch rate control message
  • a RAT indicator indicating a specific RAT to which the branch rate needs to be controlled, (Tl + T2) / T or (Tl-threshold + T2-threshold) / T or T1 + T2
  • sequence numbers (3, 8) that need to be rearranged can be sent.
  • the period may additionally transmit information about the bearer branch configuration (bearer spl it conf igurat ion).
  • a period can be added in case of real-time data that is sensitive to latency.
  • the transmitting side e.g., eNB
  • the receiving side e.g., the terminal
  • the ratio of the split data of each RAT can be adjusted. For example, if a cell rearrangement of the data transmitted by the eNB of the eNB to the AP is long, the ratio of data transmitted by the eNB to the AP through the WLAN is lowered based on the branch rate control message information transmitted by the UE. You can increase the rate at which data is sent over the network.
  • Embodiments described above are 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 components and / or features to constitute an embodiment of the invention. The order of the operations described in the embodiments of the present invention may be changed. Part of an embodiment Configurations or features may be included in other embodiments, or may be substituted for alternative configurations or features of other embodiments. 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 and apparatus for retransmitting data by a base station of a first communication system in a network interworking with a plurality of communication systems are available industrially in an LTE / LTE-A system, which is an example of a wireless communication system.

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Abstract

Un procédé de retransmission de données à partir d'une station de base d'un premier système de communication dans un réseau dans lequel une pluralité de systèmes de communication sont reliés, selon la présente invention, peut comprendre les étapes consistant à : émettre, vers une station de base d'un second système de communication, des informations relatives à des données de liaison descendante (DL) devant être transmises à l'aide d'une porteuse divisée en niveau d'accès radio pour émettre/recevoir des données entre la station de base du premier système de communication et la station de base du second système de communication; recevoir, en provenance de la station de base du second système de communication, une réponse de confirmation à une indication, lorsque les informations relatives aux données de liaison descendante devant être émises à l'aide de la porteuse divisée en niveau d'accès radio indiquent qu'une retransmission est réalisée en provenance de la station de base du premier système de communication; émettre les données de liaison descendante vers la station de base du second système de communication sur la base de la réponse de confirmation; et retransmettre les données de liaison descendante vers un terminal lorsqu'est satisfaite une condition spécifique.
PCT/KR2015/000376 2015-01-14 2015-01-14 Procédé de retransmission de données dans un réseau reliant une pluralité de systèmes de communication et appareil associé WO2016114425A1 (fr)

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