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WO2014165690A1 - Mecanisme de detection de porteuse virtuelle pour une evolution a long terme (lte) - Google Patents

Mecanisme de detection de porteuse virtuelle pour une evolution a long terme (lte) Download PDF

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Publication number
WO2014165690A1
WO2014165690A1 PCT/US2014/032855 US2014032855W WO2014165690A1 WO 2014165690 A1 WO2014165690 A1 WO 2014165690A1 US 2014032855 W US2014032855 W US 2014032855W WO 2014165690 A1 WO2014165690 A1 WO 2014165690A1
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WIPO (PCT)
Prior art keywords
enb
transmission
confirmation
subsequent
notification
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Ceased
Application number
PCT/US2014/032855
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English (en)
Inventor
Alexei Davydov
Vadim Sergeyev
Gregory Morozov
Apostolos Papathanassiou
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Intel IP Corp
Original Assignee
Intel IP Corp
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Priority claimed from US14/141,179 external-priority patent/US20140301354A1/en
Application filed by Intel IP Corp filed Critical Intel IP Corp
Priority to HK16104927.2A priority Critical patent/HK1216952B/zh
Priority to PCT/US2014/032855 priority patent/WO2014165690A1/fr
Priority to CN201480011258.XA priority patent/CN105027469B/zh
Publication of WO2014165690A1 publication Critical patent/WO2014165690A1/fr
Anticipated expiration legal-status Critical
Ceased legal-status Critical Current

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    • Y02D—CLIMATE CHANGE MITIGATION TECHNOLOGIES IN INFORMATION AND COMMUNICATION TECHNOLOGIES [ICT], I.E. INFORMATION AND COMMUNICATION TECHNOLOGIES AIMING AT THE REDUCTION OF THEIR OWN ENERGY USE
    • Y02D30/00—Reducing energy consumption in communication networks
    • Y02D30/70—Reducing energy consumption in communication networks in wireless communication networks

Definitions

  • the main performance limiting factor is interference.
  • the interference results from transmissions of neighboring base stations (BSs)/evolved Node Bs (eNBs).
  • BSs base stations
  • eNBs evolved Node Bs
  • the current approach is to coordinate transmissions of eNBs in several cells so the cells do not affect, or at least have less impact on, the reception of users in neighboring cells.
  • LTE provides various mechanisms for such coordination in
  • CoMP Coordinated Multipoint
  • FIG. 1 illustrates a wireless network according to an embodiment
  • FIG. 2 illustrates a flow chart of a method for provide virtual carrier sensing for LTE according to an embodiment
  • FIG. 3 is a message flow diagram illustrating method for providing a notification based on virtual carrier sensing for LTE according to an embodiment
  • FIG. 4 is a message flow diagram illustrating method for providing a confirmation to a notification based on virtual carrier sensing for LTE according to an embodiment
  • Fig. 5 illustrates an evolved Node B (eNB) according to an embodiment
  • FIG. 6 illustrates a block diagram of an example machine for providing virtual carrier sensing mechanism for LTE according to an embodiment.
  • a mechanism is provided to coordinate interference from neighboring eNBs when there is poor connectivity between the eNBs. Potential downlink transmissions are detected in the neighboring cell similar to virtual carrier sensing used in WiFi. Interference mitigation according to an embodiment may be implemented with coordinating eNBs that do not have backhaul link. Therefore, the interference mitigation according to an embodiment is more robust and provides system performance improvement even for simple deployments.
  • radio frame collisions may occur when simultaneous transmissions from several stations to the same or different stations interfere with each other thus becoming impossible to decode.
  • an exchange of short control frames is used prior to sending the large frame with the data payload.
  • RTS Request to Send
  • CTS Clear to Send
  • Each of these frames contains an indication of a time interval that the transmission would occupy.
  • Fig. 1 illustrates a wireless network 100 according to an embodiment.
  • evolved Node B one i.e., eNB l 110
  • eNB2 120 is the interfering cell.
  • UE 2 122 experiences interference 114 from eNBl 110 and UE 1 112 experiences interference 124 from eNB2 120.
  • eNB small cell eNBs
  • BTS base transceiver stations
  • eNBs evolved node Bs
  • SC-eNBs small cell evolved node Bs
  • Base transceiver station (BTS) may also refer to radio base station (BS), node B (in third generation (3G) networks, or base station (BS).
  • BS radio base station
  • BS node B
  • 3G third generation
  • BS base station
  • eNB will be used herein.
  • LTE uses a backhaul link 130 between the coordinated eNBs 110, 120 to provide coordination between eNBs 110, 120 using CoMP (Coordinated Multipoint) specifications.
  • CoMP Coordinated Multipoint
  • the eNBs 110, 120 may be connected over the backhaul link 130 to a radio network controller (RNC) 140.
  • RNC radio network controller
  • the eNBs i.e., eNBl 110 and eNB2 120, may include a controller and thus the RNC 140 may not be provided.
  • the connectivity provided by the backhaul link 130 between the coordinating eNBs 110, 120 may fail if the connection is absent, if delay associated with the backhaul link 130 presents a problem or if the backhaul link 130 has insufficient throughput performance. In these cases, the CoMP approach fails.
  • the interference 114, 124 has even more impact in the deployment with small cells due to use of a very large number of small cell eNBs (SC-eNBs) and the inability of operators to provide a predetermined backhaul connectivity between them.
  • SC-eNBs small cell eNBs
  • Fig. 2 illustrates a flow chart 200 of a method for provide virtual carrier sensing for LTE according to an embodiment.
  • Enabling downlink interference coordination involves interfering eNB 2 being aware of potential downlink transmission from eNBl to UE 1 in the home cell, the cell provided by eNBl .
  • eNB 1 sends a notification of subsequent DL transmission to the UE 1 in the downlink 210.
  • the notification includes information of how many sub frames will be used by the subsequent transmission, and which frequency resources, physical resource blocks (PRBs), will be used.
  • PRBs physical resource blocks
  • the notification may be transmitted in the Downlink Control Information (DCI) field in order to enable the UE 1 to process the notification quickly, e.g., within up to 4 sub frames.
  • DCI Downlink Control Information
  • the eNB2 cannot hear this notification because the eNB2 is also transmitting in the same time-frequency resources.
  • UE 1 sends a confirmation of the received DL notification 220. In this confirmation, the UE 1 includes information of the DL frame resources that eNBl plans to use when sending data to UE 1.
  • eNB2 can overhear the confirmation, decode it and extract the information of the DL resources that eNB 1 is planning to use 230.
  • a determination is made whether eNB2 is already transmitting in the indicated DL resources 240. If not 242, eNB2 marks the indicated DL resources as busy and refrains from transmitting in those resources 250. If yes 244, a determination is made whether the eNB2 was going to occupy these resources itself to transmit data to UE 2 260. If not 262, the eNB2 does not reschedule the transmission to alternative resources 270. If yes 264, the eNB2 reschedules the transmission using alternative resources so that interference with eNB l to UE 1 transmission is avoided 280.
  • Fig. 3 is a message flow diagram 300 illustrating method for providing a notification based on virtual carrier sensing for LTE according to an embodiment.
  • two eNBs are shown: eNBl 310 and eNB2 320.
  • the eNBl 310 and eNB2 320 may operate in accordance with a Third Generation Partnership Project (3GPP) LTE/LTE-A (Long Term Evolution/Long Term Evolution- Advanced) or other suitable wireless wide area network (WWAN) protocol, and may include a configuration to provide wireless network communications in operation with an evolved packet core (EPC) 360, for communication of data to an Internet Protocol (IP) network 370.
  • 3GPP Third Generation Partnership Project
  • LTE/LTE-A Long Term Evolution/Long Term Evolution- Advanced
  • WWAN wireless wide area network
  • EPC evolved packet core
  • IP Internet Protocol
  • Both eNBl 310 and eNB2 320 plan to transmit to their respective UEs, UE 1 312 and UE 2 322, and, in accordance with their plans, transmissions are going to overlap in frequency.
  • the eNBl 310 sends a notification 330 to UE 1 312.
  • the potential eNBl/UE 1 transmission 340 is shown overlapping with the planned eNB2/UE 2 transmission 350.
  • Fig. 4 is a message flow diagram 400 illustrating method for providing a confirmation to a notification based on virtual carrier sensing for LTE according to an embodiment.
  • UE 1 412 sends a confirmation 460 to eNBl 410.
  • the eNBl 410 and eNB2 420 may again provide wireless network communications in operation with an evolved packet core (EPC) 460, for communication of data to an Internet Protocol (IP) network 470.
  • EPC evolved packet core
  • IP Internet Protocol
  • eNB2 420 overhears the confirmation 480 sent by UE 1 412.
  • the eNB2 420 may thus reschedule its planned transmission to the UE 2 422.
  • the reschedule eNB2/UE 2 transmission 450 does not overlap with the potential eNBl/UE 1 transmission 440.
  • Fig. 5 illustrates an evolved Node B (eNB) 500 according to an embodiment.
  • the eNB 500 contains at least one radio transmitter 510, receiver 512, an antenna system 514, a control section 516, memory 518 and a power supply 520.
  • the control section 516 of the eNB 500 may include a controller 530.
  • the controller may be arranged to provide resource management and logic control functions for allowing eNBs to directly communicate with each other.
  • the controller 530 of the eNB 500 may also provide functions including radio resource management (RRM), radio bearer control, radio admission control (access control), connection mobility management, resource scheduling between UEs and eNB radios, scheduling and transmitting messages (incoming calls and connection requests), broadcast information coordination (system information), and measurement reporting (to assist in handover decisions).
  • RRM radio resource management
  • the controller 530 is further arranged to transmit PDSCH data and DM-RS to the UE(s).
  • the controller 530 Upon receiving CQI feedback from the UE(s), the controller 530 is arranged to apply and/or adjust the MCS and include the applied and/or adjusted MCS to the next PDSCH.
  • the eNB 500 may operate as a standalone device or may be connected (e.g., networked) to other machines.
  • the controller 530 may be capable of executing instructions (sequential or otherwise) that specify actions to be taken by the eNB 500.
  • the term "controller” shall also be taken to include any collection of machines that individually or jointly execute a set (or multiple sets) of instructions to perform any one or more of the methodologies discussed herein.
  • At least a part of one or more computer systems may be configured by firmware or software (e.g., instructions, an application portion, or an application) as a module that operates to perform specified operations.
  • the software may reside on at least one machine readable medium.
  • the software when executed by the underlying hardware of the module, causes the hardware to perform the specified operations.
  • At least one machine readable medium 580 may be used to store one or more sets of data structures or instructions 582 (e.g., software) embodying or utilized by any one or more of the techniques or functions described herein.
  • the instructions 582 may also reside, at least partially, on additional machine readable memories such as memory 518, or within the controller 530 during execution thereof by the eNB 500.
  • additional machine readable memories such as memory 518, or within the controller 530 during execution thereof by the eNB 500.
  • one or any combination of the controller 530, the memory 518, etc. may constitute machine readable media.
  • the machine readable medium 580 is illustrated as a single medium, the term "machine readable medium" may include a single medium or multiple media (e.g., a centralized or distributed database, and/or associated caches and servers) that configured to store the one or more instructions 582.
  • machine readable medium may include any medium that is capable of storing, encoding, or carrying instructions for execution by the eNB 500 and that cause the eNB 500 to perform any one or more of the techniques of the present disclosure, or that is capable of storing, encoding or carrying data structures used by or associated with such instructions.
  • Non- limiting machine readable medium examples may include solid-state memories, and optical and magnetic media.
  • machine readable media may include: non- volatile memory, such as semiconductor memory devices (e.g., Electrically Programmable Read-Only Memory (EPROM), Electrically Erasable Programmable Read-Only Memory (EEPROM)) and flash memory devices; magnetic disks, such as internal hard disks and removable disks; magneto-optical disks; and CD-ROM and DVD-ROM disks.
  • the instructions 582 may further be transmitted or received over bus 552 utilizing any one of a number of transfer protocols (e.g., frame relay, internet protocol (IP), transmission control protocol (TCP), user datagram protocol (UDP), hypertext transfer protocol (HTTP), etc.).
  • transfer protocols e.g., frame relay, internet protocol (IP), transmission control protocol (TCP), user datagram protocol (UDP), hypertext transfer protocol (HTTP), etc.
  • FIG. 6 illustrates a block diagram of an example machine 600 for providing virtual carrier sensing mechanism for LTE according to an embodiment upon which any one or more of the techniques (e.g.,
  • the machine 600 may operate as a standalone device or may be connected (e.g., networked) to other machines. In a networked deployment, the machine 600 may operate in the capacity of a server machine and/or a client machine in server-client network environments. In an example, the machine 600 may act as a peer machine in peer-to-peer (P2P) (or other distributed) network environment.
  • the machine 600 may be a personal computer (PC), a tablet PC, a set-top box (STB), a Personal Digital Assistant (PDA), a mobile telephone, a web appliance, a network router, switch or bridge, or any machine capable of executing instructions (sequential or otherwise) that specify actions to be taken by that machine.
  • PC personal computer
  • PDA Personal Digital Assistant
  • machine shall also be taken to include any collection of machines that individually or jointly execute a set (or multiple sets) of instructions to perform any one or more of the methodologies discussed herein, such as cloud computing, software as a service (SaaS), other computer cluster configurations.
  • cloud computing software as a service
  • SaaS software as a service
  • Examples, as described herein, may include, or may operate on, logic or a number of components, modules, or mechanisms.
  • Modules are tangible entities (e.g., hardware) capable of performing specified operations and may be configured or arranged in a certain manner.
  • circuits may be arranged (e.g., internally or with respect to external entities such as other circuits) in a specified manner as a module.
  • at least a part of one or more computer systems (e.g., a standalone, client or server computer system) or one or more hardware processors 602 may be configured by firmware or software (e.g., instructions, an application portion, or an application) as a module that operates to perform specified operations.
  • the software may reside on at least one machine readable medium.
  • the software when executed by the underlying hardware of the module, causes the hardware to perform the specified operations.
  • module is understood to encompass a tangible entity, be that an entity that is physically constructed, specifically configured (e.g., hardwired), or temporarily (e.g., transitorily) configured (e.g., programmed) to operate in a specified manner or to perform at least part of any operation described herein.
  • modules are temporarily configured, a module need not be instantiated at any one moment in time.
  • the modules comprise a general-purpose hardware processor 602 configured using software; the general-purpose hardware processor may be configured as respective different modules at different times.
  • Software may accordingly configure a hardware processor, for example, to constitute a particular module at one instance of time and to constitute a different module at a different instance of time.
  • application or variants thereof, is used expansively herein to include routines, program modules, programs, components, and the like, and may be implemented on various system configurations, including single-processor or multiprocessor systems, microprocessor-based electronics, single-core or multi-core systems, combinations thereof, and the like.
  • application may be used to refer to an embodiment of software or to hardware arranged to perform at least part of any operation described herein.
  • Machine 600 may include a hardware processor 602 (e.g., a central processing unit (CPU), a graphics processing unit (GPU), a hardware processor core, or any combination thereof), a main memory 604 and a static memory 606, at least some of which may communicate with others via an interlink (e.g., bus) 608.
  • the machine 600 may further include a display unit 610, an alphanumeric input device 612 (e.g., a keyboard), and a user interface (UI) navigation device 614 (e.g., a mouse).
  • the display unit 610, input device 612 and UI navigation device 614 may be a touch screen display.
  • the machine 600 may additionally include a storage device (e.g., drive unit) 616, a signal generation device 618 (e.g., a speaker), a network interface device 620, and one or more sensors 621, such as a global positioning system (GPS) sensor, compass, accelerometer, or other sensor.
  • the machine 600 may include an output controller 628, such as a serial (e.g., universal serial bus (USB), parallel, or other wired or wireless (e.g., infrared (I )) connection to communicate or control one or more peripheral devices (e.g., a printer, card reader, etc.).
  • a serial e.g., universal serial bus (USB)
  • parallel e.g., parallel, or other wired or wireless (e.g., infrared (I ) connection to communicate or control one or more peripheral devices (e.g., a printer, card reader, etc.).
  • I infrared
  • the storage device 616 may include at least one machine readable medium 622 on which is stored one or more sets of data structures or instructions 624 (e.g., software) embodying or utilized by any one or more of the techniques or functions described herein.
  • the instructions 624 may also reside, at least partially, additional machine readable memories such as main memory 604, static memory 606, or within the hardware processor 602 during execution thereof by the machine 600.
  • main memory 604, static memory 606, or the storage device 616 may constitute machine readable media.
  • machine readable medium 622 is illustrated as a single medium, the term “machine readable medium” may include a single medium or multiple media (e.g., a centralized or distributed database, and/or associated caches and servers) that configured to store the one or more instructions 624.
  • machine readable medium may include a single medium or multiple media (e.g., a centralized or distributed database, and/or associated caches and servers) that configured to store the one or more instructions 624.
  • machine readable medium may include any medium that is capable of storing, encoding, or carrying instructions for execution by the machine 600 and that cause the machine 600 to perform any one or more of the techniques of the present disclosure, or that is capable of storing, encoding or carrying data structures used by or associated with such instructions.
  • Non- limiting machine readable medium examples may include solid-state memories, and optical and magnetic media.
  • machine readable media may include: non- volatile memory, such as semiconductor memory devices (e.g., Electrically Programmable Read-Only Memory (EPROM), Electrically Erasable Programmable Read-Only Memory (EEPROM)) and flash memory devices; magnetic disks, such as internal hard disks and removable disks; magneto-optical disks; and CD-ROM and DVD-ROM disks.
  • non- volatile memory such as semiconductor memory devices (e.g., Electrically Programmable Read-Only Memory (EPROM), Electrically Erasable Programmable Read-Only Memory (EEPROM)) and flash memory devices
  • EPROM Electrically Programmable Read-Only Memory
  • EEPROM Electrically Erasable Programmable Read-Only Memory
  • flash memory devices e.g., electrically Erasable Programmable Read-Only Memory (EEPROM)
  • EPROM Electrically Programmable Read-Only Memory
  • EEPROM Electrically Erasable Programmable Read-Only Memory
  • flash memory devices e.g., electrically Erasable Programmable
  • the instructions 624 may further be transmitted or received over a communications network 626 using a transmission medium via the network interface device 620 utilizing any one of a number of transfer protocols (e.g., frame relay, internet protocol (IP), transmission control protocol (TCP), user datagram protocol (UDP), hypertext transfer protocol (HTTP), etc.).
  • Example communication networks may include a local area network (LAN), a wide area network (WAN), a packet data network (e.g., the Internet), mobile telephone networks ((e.g., channel access methods including Code Division Multiple Access (CDMA), Time-division multiple access (TDMA), Frequency-division multiple access (FDMA), and Orthogonal Frequency Division Multiple Access (OFDMA) and cellular networks such as Global System for Mobile
  • GSM Global System for Mobile Communications
  • UMTS Universal Mobile Telecommunications System
  • CDMA 2000 lx* standards and Long Term Evolution (LTE) Plain Old Telephone
  • POTS Plain Old Telephone
  • IEEE Institute of Electrical and Electronics Engineers
  • WiFi IEEE 802.11 standards
  • WiMax® IEEE 802.16 standards
  • P2P peer-to-peer
  • the network interface device 620 may include one or more physical jacks (e.g., Ethernet, coaxial, or phone jacks) or one or more antennas to connect to the communications network 626.
  • the network interface device 620 may include a plurality of antennas to wirelessly communicate using at least one of single- input multiple-output (SIMO), multiple-input multiple-output (MIMO), or multiple-input single-output (MISO) techniques.
  • SIMO single- input multiple-output
  • MIMO multiple-input multiple-output
  • MISO multiple-input single-output
  • transmission medium shall be taken to include any intangible medium that is capable of storing, encoding or carrying instructions for execution by the machine 600, and includes digital or analog
  • embodiments may include fewer features than those disclosed in a particular example.
  • the following claims are hereby incorporated into the Detailed Description, with a claim standing on its own as a separate embodiment.
  • the scope of the embodiments disclosed herein is to be determined with reference to the appended claims, along with the full scope of equivalents to which such claims are entitled.

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Abstract

Conformément à des modes de réalisation, la présente invention vise d'une manière générale à permettre la détection de porteuse virtuelle pour une évolution à long terme (LTE). Dans certains modes de réalisation, un premier nœud B évolué (eNB) envoie une notification d'une transmission en liaison descendante (DL) ultérieure à un premier équipement utilisateur (UE) dans une liaison descendante. Dans la liaison montante, le premier UE envoie une confirmation de la notification de liaison descendante (DL) reçue. Un second eNB entend par hasard la confirmation, la décode et extrait les informations des ressources de liaison descendante (DL) que le premier eNB a prévu d'utiliser. Si le second eNB n'effectue pas déjà une transmission dans les ressources de liaison descendante (DL) indiquées, le second eNB marque les ressources de liaison descendante (DL) indiquées comme occupées et s'abstient d'effectuer une transmission dans ces ressources. Le second eNB peut ensuite replanifier sa transmission à l'aide de ressources alternatives de telle sorte qu'un brouillage provenant du second eNB1 peut être évité.
PCT/US2014/032855 2013-04-04 2014-04-03 Mecanisme de detection de porteuse virtuelle pour une evolution a long terme (lte) Ceased WO2014165690A1 (fr)

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HK16104927.2A HK1216952B (zh) 2013-04-04 2014-04-03 针对长期演进(lte)的虚拟载波检测机制
PCT/US2014/032855 WO2014165690A1 (fr) 2013-04-04 2014-04-03 Mecanisme de detection de porteuse virtuelle pour une evolution a long terme (lte)
CN201480011258.XA CN105027469B (zh) 2013-04-04 2014-04-03 针对长期演进(lte)的虚拟载波检测机制

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US201361808597P 2013-04-04 2013-04-04
US61/808,597 2013-04-04
US14/141,179 2013-12-26
US14/141,179 US20140301354A1 (en) 2013-04-04 2013-12-26 Virtual carrier sensing mechanism for long term evolution (lte)
PCT/US2014/032855 WO2014165690A1 (fr) 2013-04-04 2014-04-03 Mecanisme de detection de porteuse virtuelle pour une evolution a long terme (lte)

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