EP2859773A1 - Transmissions à destination de dispositifs à grande vitesse - Google Patents

Transmissions à destination de dispositifs à grande vitesse

Info

Publication number
EP2859773A1
EP2859773A1 EP20120878373 EP12878373A EP2859773A1 EP 2859773 A1 EP2859773 A1 EP 2859773A1 EP 20120878373 EP20120878373 EP 20120878373 EP 12878373 A EP12878373 A EP 12878373A EP 2859773 A1 EP2859773 A1 EP 2859773A1
Authority
EP
European Patent Office
Prior art keywords
communication device
transmission
transmissions
reference symbols
data symbols
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.)
Withdrawn
Application number
EP20120878373
Other languages
German (de)
English (en)
Other versions
EP2859773A4 (fr
Inventor
Chunye Wang
Peter Skov
Lilei Wang
Li Zhang
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Nokia Solutions and Networks Oy
Original Assignee
Nokia Solutions and Networks Oy
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by Nokia Solutions and Networks Oy filed Critical Nokia Solutions and Networks Oy
Publication of EP2859773A1 publication Critical patent/EP2859773A1/fr
Publication of EP2859773A4 publication Critical patent/EP2859773A4/fr
Withdrawn legal-status Critical Current

Links

Classifications

    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04B—TRANSMISSION
    • H04B7/00—Radio transmission systems, i.e. using radiation field
    • H04B7/02—Diversity systems; Multi-antenna system, i.e. transmission or reception using multiple antennas
    • H04B7/04—Diversity systems; Multi-antenna system, i.e. transmission or reception using multiple antennas using two or more spaced independent antennas
    • H04B7/0413—MIMO systems
    • H04B7/0456—Selection of precoding matrices or codebooks, e.g. using matrices antenna weighting
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04B—TRANSMISSION
    • H04B7/00—Radio transmission systems, i.e. using radiation field
    • H04B7/02—Diversity systems; Multi-antenna system, i.e. transmission or reception using multiple antennas
    • H04B7/04—Diversity systems; Multi-antenna system, i.e. transmission or reception using multiple antennas using two or more spaced independent antennas
    • H04B7/06—Diversity systems; Multi-antenna system, i.e. transmission or reception using multiple antennas using two or more spaced independent antennas at the transmitting station
    • H04B7/0686—Hybrid systems, i.e. switching and simultaneous transmission
    • H04B7/0689—Hybrid systems, i.e. switching and simultaneous transmission using different transmission schemes, at least one of them being a diversity transmission scheme
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
    • H04L5/00—Arrangements affording multiple use of the transmission path
    • H04L5/0001—Arrangements for dividing the transmission path
    • H04L5/0014—Three-dimensional division
    • H04L5/0023—Time-frequency-space
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
    • H04L5/00—Arrangements affording multiple use of the transmission path
    • H04L5/003—Arrangements for allocating sub-channels of the transmission path
    • H04L5/0048—Allocation of pilot signals, i.e. of signals known to the receiver
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04W—WIRELESS COMMUNICATION NETWORKS
    • H04W72/00—Local resource management
    • H04W72/20—Control channels or signalling for resource management
    • H04W72/23—Control channels or signalling for resource management in the downlink direction of a wireless link, i.e. towards a terminal

Definitions

  • the multi-antenna transmission of reference symbols according to identical precoding as that used for data symbols in the same resource block, and the use of such reference signals at the receiver to demodulate the data signals, has been proposed as an enhanced technique for improving performance in a radio communication system.
  • a method comprising: in response to an indication that a communication device is changing its physical location at a rate above a predetermined threshold, selecting for transmissions to said communication device a transmission mode according to which: data symbols are transmitted together with reference symbols ac- cording to the same precoding as said data symbols; data symbols and reference symbols share a common precoding matrix over a plurality of resource blocks; and multi-layer transmissions involve the transmission of reference symbols for a plurality of layers via shared pairs of resource elements using orthogonal cover codes according to which no despreading is required at the communication device.
  • said transmission mode further comprises selecting a set of resource blocks for transmissions to said communication device without taking channel conditions into account.
  • the method further comprises informing said communication of the selection of said transmission mode for transmissions to said communication device.
  • the method further comprises informing said communication device of a scheduled transmission to said communication device without explicitly identifying the resource allocation type for said scheduled transmission.
  • the method further comprises informing said communica- tion device of a scheduled multi-layer transmission to said communication device without explicitly identifying the antenna ports, scrambling identity and number of layers for said multi-layer transmission.
  • a method comprising: receiving at a communication device from an access network an indication of the selection for transmissions from said access network to said communication device a transmission mode according to which: data symbols are transmitted together with reference symbols according to the same precoding as said data symbols; data symbols and reference symbols share a common precoding matrix over a plurality of resource blocks; and multi-layer transmissions involve the trans- mission of reference symbols for a plurality of layers via shared pairs of resource elements using orthogonal cover codes according to which no despreading is required at the communication device.
  • the method further comprises receiving information about a scheduled transmission to said communication device, and identifying the resources allocated to the scheduled transmission using the resource allocation type pre-specified for transmissions according to said transmission mode.
  • the method further comprises receiving information about a scheduled multi-layer transmission to said communication device, and processing the sig- nals of said multi-layer transmission according to the antenna ports, scrambling identity and number of layers pre-specified for multi-layer transmissions according to said transmission mode.
  • an apparatus comprising: a processor and memory incfud- ing computer program code, wherein the memory and computer program code are configured to, with the processor, cause the apparatus to: in response to an indication that a communication device is changing its physical location at a rate above a predetermined threshold, select for transmissions to said communication device a transmission mode according to which: data symbols are transmitted together with reference symbols ac- cording to the same precoding as said data symbols; data symbols and reference symbols share a common precoding matrix over a plurality of resource blocks; and multi-layer transmissions involve the transmission of reference symbols for a plurality of layers via shared pairs of resource elements using orthogonal cover codes according to which no despreading is required at the communication device.
  • said transmission mode further comprises selecting a set of resource blocks for transmissions to said communication device without taking channel conditions into account.
  • the memory and computer program code are further configured to, with the processor, cause the apparatus to: inform said communication of the selection of said transmission mode for transmissions to said communication device.
  • the memory and computer program code are further con- figured to, with the processor, cause the apparatus to: inform said communication device of a scheduled transmission to said communication device without explicitly identifying the resource allocation type for said scheduled transmission.
  • the memory and computer program code are further con- figured to, with the processor, cause the apparatus to: inform said communication device of a scheduled multi-layer transmission to said communication device without explicitly identifying the antenna ports, scrambling identity and number of layers for said multi-layer transmission.
  • an apparatus comprising: a processor and memory includ- ing computer program code, wherein the memory and computer program code are configured to, with the processor, cause the apparatus to: receive at a communication device from an access network an indication of the selection for transmissions from said access network to said communication device a transmission mode according to which: data symbols are transmitted together with reference symbols according to the same precoding as said data symbols; data symbols and reference symbols share a common precoding matrix over a plurality of resource blocks; and multi-layer transmissions involve the transmission of reference symbols for a plurality of layers via shared pairs of resource elements using orthogonal cover codes according to which no despreading is required at the communication device.
  • the memory and computer program code are further configured to, with the processor, cause the apparatus to: receive information about a scheduled transmission to said communication device, and identifying the resources allocated to the scheduled transmission using the resource allocation type pre-specified for transmissions according to said transmission mode.
  • the memory and computer program code are further configured to, with the processor, cause the apparatus to: receive information about a scheduled multi-layer transmission to said communication device, and processing the signals of said multi-layer transmission according to the antenna ports, scrambling identity and number of layers pre-specified for multi-layer transmissions according to said transmission mode.
  • a computer program product comprising program code means which when loaded into a computer controls the computer to: in response to an indication that a communication device is changing its physical location at a rate above a predetermined threshold, select for transmissions to said communication device a trans- mission mode according to which: data symbols are transmitted together with reference symbols according to the same precoding as said data symbols; data symbols and reference symbols share a common precoding matrix over a plurality of resource blocks; and multi-layer transmissions involve the transmission of reference symbols for a plurality of layers via shared pairs of resource elements using orthogonal cover codes according to which no despreading is required at the communication device.
  • a computer program product comprising program code means which when loaded into a computer controls the computer to: receive at a commu- nication device from an access network an indication of the selection for transmissions from said access network to said communication device a transmission mode according to which: data symbols are transmitted together with reference symbols according to the same precoding as said data symbols; data symbols and reference symbols share a common precoding matrix over a plurality of resource blocks; and multi-layer transmis- sions involve the transmission of reference symbols for a plurality of layers via shared pairs of resource elements using orthogonal cover codes according to which no de- spreading is required at the communication device.
  • Figure 1 illustrates an example of a cellular network in which embodiments of the present invention are implemented
  • Figure 2 illustrates an example of apparatus for use at user equipment in Figure 1 ;
  • Figure 3 illustrates an example of apparatus for use at eNodeB in Figure 1 ;
  • Figure 4 illustrates an example of an enhanced transmission technique for transmitting data symbols;
  • Figure 5 illustrates an example of transmitting reference symbols in a multi-layer transmission technique according to an embodiment of the present invention
  • Figure 6 illustrates an example of operations at a network access node in accordance with an embodiment of the present invention
  • Figure 7 illustrates an example of operations at a user equipment of Figure 1 in accordance with an embodiment of the present invention.
  • Figures 8 and 9 illustrate the achievement in performance improvement through the use of a transmission mode that does not require dispreading of reference signals at the re-ordinatever.
  • Embodiments of the invention are described in detail below, by way of example only, in the context of a cellular network operating in accordance with an E-UTRAN standard.
  • FIG 1 illustrates an example of a cellular network in which embodiments of the present invention can be implemented.
  • the cellular network includes cells 4 with transceivers at respective eNodeBs (eNBs). Only nine cells are shown in Figure 1 , but a mobile telecommunication network will typically comprise tens of thousands of cells.
  • Each eNB 2 is connected by a wired link to a core network (not shown).
  • FIG 2 shows a schematic view of an example of user equipment 8 that may be used for communicating with the eNBs 2 of Figure 1 via a wireless interface.
  • the user equipment (UE) 8 may be used for various tasks such as making and receiving phone calls, for receiving and sending data from and to a data network and for experiencing, for example, multimedia or other content.
  • the UE 8 may be any device capable of at least sending or receiving radio signals to or from the eNBs 2 of Figure 1.
  • Non-limiting examples include a mobile station (MS), a portable computer provided with a wireless interface card or other wireless interface facility, personal data assistant (PDA) provided with wireless communication capabilities, or any combinations of these or the like.
  • the UE 8 may communicate via an appropriate radio interface arrangement of the UE 8.
  • the interface arrangement may be provided for example by means of a radio part and associated antenna arrangement.
  • the antenna arrangement may be arranged internally or externally to the UE 8, and may include a plural- ity of antennas capable of operating in the kind of multi-layer transmission scheme described below.
  • the UE 8 may be provided with at least one data processing entity 203 and at least one memory or data storage entity 217 for use in tasks it is designed to perform.
  • the data processor 213 and memory 217 may be provided on an appropriate circuit board 219 and/or in chipsets.
  • the user may control the operation of the UE 8 by means of a suitable user interface such as key pad 201 , voice commands, touch sensitive screen or pad, combinations thereof or the like.
  • a display 215, a speaker and a microphone may also be provided.
  • the UE 8 may comprise appropriate connectors ⁇ either wired or wireless) to other devices and/or for connecting external accessories, for example hands-free equipment, thereto.
  • UE 8 may also be a relay node configured to relay transmissions from eNB 2 to one or more communication devices.
  • FIG 3 shows an example of apparatus for use at the eNBs 2 of Figure 1 and for serving the ceil 4 in which UE 8 is located.
  • the apparatus comprises a radio frequency antenna array 301 configured to receive and transmit radio frequency signals; radio frequency interface circuitry 303 configured to interface the radio frequency signals received and transmitted by the 8-antenna array 301 and the data processor 306.
  • the radio frequency interface circuitry 303 may also be known as a transceiver.
  • the apparatus also comprises an interface 309 via which it can send and receive information to and from one or more other network nodes.
  • the data processor 306 is configured to process signals from the radio frequency interface circuitry 303, control the radio frequency interface circuitry 303 to generate suitable RF signals to communicate information to the UE 6 via the wireless communications link, and also to exchange information with other network nodes via the interface 309.
  • the memory 307 is used for storing data, parameters and instructions for use by the data processor 306. It would be appreciated that the apparatus shown in each of figures 2 and 3 described above may comprise further elements which are not directly involved with the embodiments of the invention described hereafter.
  • the downlink transmission of data to a communication device on a physical downlink shared channel involves a MAC (medium access control) scheduler at eNB 2 allocating radio resources in the time-frequency domain to said downlink transmission of data to said communication device.
  • the bandwidth available to eNB 2 is divided up into physical resource blocks (PRBs), wherein each physical resource block consists of a grid of 84 resource elements comprising 7 consecutive OFDM time symbols for each of 12 contiguous OFDM sub-carriers).
  • PRBs physical resource blocks
  • the MAC scheduler assigns PRBs in pairs of 2 consecutive PRBs in the time domain.
  • the downlink (DL) physical processing chain involves generating complex-valued modula- tion symbols (data and reference symbols).
  • the process of generating these complex valued modulation symbols includes: scrambling of coded bits, and modulation of the scrambled bits.
  • the complex-valued modulation symbols are next mapped onto one or more transmission layers (antenna ports), according to whether the transmission is to be a single layer transmission or a multi-layer transmission.
  • the physical processing next involves deciding on a precoding matrix for the com- plex-valued modulation symbols (both data symbols and reference symbols) of each transmission layer (antenna port).
  • the precoding matrix maps the stream of complex-valued modulation symbols for the antenna port onto the 8 antennas.
  • different precoding matrices are used for each antenna ports.
  • reference symbols for UE-specific reference signals (DM-RS) as described at Section 6.10.3 of 3GPP TS36.211 ) of antenna port N are subjected to the same precoding as the complex-valued modulation data symbols for antenna port N.
  • This non-codebook-based transmission technique does not use predefined precoding ma- trices for the precoding at eNB 2 and deprecoding at UE 8.
  • eNB 2 freely selects downlink transmission weights for each antenna of the antenna array, without being restricted to one of a limited predefined number of combinations.
  • UE 8 demodulates the signals detected on time-frequency resources allocated to data symbols according to information derived by UE 8 from the DM-RS that UE 8 knows have been transmitted with the same precoding as the data signals.
  • the physical processing next involves mapping the modulation symbols for each antenna port to the resource elements of the resource blocks assigned to the transmission by the MAC scheduler, and finally involves generating complex-valued time-domain OFDM signals for each of the eight antennas in accordance with the one or more precoding matrices decided for the transmission.
  • eNB 2 generally selects Transmission Mode 8 or Transmission Mode 9 defined at 3GPP TS 36.213 V10.1.0, Section 7.1 for transmissions to UEs.
  • Both the dual layer transmission scheme of said Transmission Mode 8 and the spatial multiplexing transmission scheme of said Transmission Mode 9 are characterised by: (a) using respective sets of DM-RS reference symbols for each layer (antenna port), and using code division multi- plexing (CDM) to differentiate the respective sets of DM-RS reference symbols transmitted on common time-frequency resources; and (b) deciding respective precoding matrices for each PRB bandwidth.
  • CDM code division multi- plexing
  • eNB 2 selects a new "high-speed" transmission mode for transmissions to UE 8, as described below.
  • Such an indication may, for example, be the result of eNB 2 continuously estimating the UE's moving speed from information available to eNB 2, or may be a message from UE 8 reporting the detection of high-speed movement at UE 8.
  • eNB 2 notifies UE 8 of a switch to this new "high-speed" transmission mode (STEP 604 of Figure 6 and STEP 702 of Figure 7).
  • UE 8 is aware of the characteristics (as discussed below) of this new "high-speed” transmission mode; and as mentioned below, informing UE 8 of the switch to the new "high-speed” transmission mode reduces the amount of information that eNB 2 needs to explicitly specify in downlink control information (DCI) for each scheduled PDSCH transmission according to the new "high-speed” transmission mode.
  • DCI downlink control information
  • the new "high-speed" transmission mode exclusively involves either a single layer transmission (Rank 1 transmission) or a dual layer transmission (Rank 2 transmission).
  • the single layer transmission uses antenna port 7 mentioned at 3GPP TS 36.213 V10.1.0, Section 7.1.
  • the dual layer transmission involves using two new antenna ports X and Y that reuse the resource elements of ports 7 and 8 mentioned at 3GPP TS 36.213 V10.1.0, Section 7.1.
  • the common location in a pair 42 of PRBs 44 of the resource elements 46 commonly used for both reference symbols for antenna port 7 and reference symbols for antenna port 8 is illustrated in Figure 5.
  • special orthogonal cover codes are used for the reference symbols for ports X and Y that do not require a despreading procedure at UE 8.
  • OCCs is [0 1] for port X and [1 0] for port Y.
  • [w71 w72] and [w81 w82] are the OCCs for antenna ports 7 and 8, respectively; and s7 and s8 are predetermined reference symbols for antenna ports 7 and 8, respec- lively.
  • the remaining resource elements 46 of the pair 42 of PRBs 44 are used for data symbols etc..
  • the new "high-speed" transmission mode also involves using the same precoding matrix (beamforming vector) across all PRBs allocated to the transmission to UE 8.
  • UE 8 rec- ognises the above-mentioned notification of a switch to the new "high-speed" transmission mode as an instruction to start reporting an average of the detected channel conditions across the whole of the bandwidth on which it receives transmissions from eNB 2, instead of making respective reports for each PRB bandwidth on which UE 8 receives transmissions from eNB 2.
  • eNB 2 decides on a common precoding matrix (or matrices for a dual-layer transmission) for all allocated PRBs based on these reports of average channel conditions from UE 8.
  • the new "high-speed" transmission mode also involves eNB 2 calculating the precoding matrix (beamforming vector) according to long-term channel state information received from UE 8. This involves eNB 2 measuring the channel(s) for UE 8 based on either measurements of transmissions by UE 8 on the physical uplink shared channel (PUSH) or measurements of uplink sounding reference signals (UL SRS) transmitted by UE 8, and then averaging the measurements over time to derive long term channel state information for UE 8.
  • PUSH physical uplink shared channel
  • UL SRS uplink sounding reference signals
  • the new "high-speed" transmission mode also involves: scheduling time-frequency re- sources (PRBs) i.e. performing frequency domain packet scheduling (FDPS), without taking channel conditions into account,; and exclusively using resource allocation type 1 for the assignment of PRBs, which involves selecting a contiguous set of PRB pairs, and for which the minimum size of the allocated resource is 2 or more PRB pairs.
  • PRBs time-frequency re- sources
  • FDPS frequency domain packet scheduling
  • eNB 2 For each scheduled single-layer or dual-layer transmission to UE 8, eNB 2 transmits downlink control information (DCI) to UE 8 (STEPS 606 and 608 of Figure 6; and STEPS 704 and 706 of Figure 7).
  • DCI downlink control information
  • eNB 2 For a single-layer transmission according to the new high-speed transmission mode, eNB 2 uses DCI Format 1A as defined at Section 5.3.3.1.3 of GPP TS 36.212 V10.5.0; and for a dual-layer transmission according to the new "high-speed" transmission scheme, eNB 2 uses a simplified version (as described below) of DCI Format 2C as defined at Section 5.3.3.1.5C of GPP TS 36.212 V10.5.0.
  • DCI Format A indicates to UE 8 that the transmission is a single layer transmission using antenna port 7 (and that port 8 is unused and that no de-spreading of the DM-RS is required before channel estimation).
  • DCI Format 2C indicates to UE 8 that the transmission is a dual-layer transmission using two antenna ports X and Y that use the resource elements of antenna ports 7 and 8, and that special OCCs are used according to which no despreading of the DM-RS is required, as described above.
  • the modifications to DCI Format 2C as defined at Section 5.3.3.1.3 of GPP TS 36.212 V10.5.0 include the following: (a) removing the 1-bit resource allocation header (which is redundant for the new "high-speed transmission mode, because only resource allocation type 1 is used); and (b) removing the 3-bit information element that explicitly indicates the antenna ports, the scrambling identity and the number of layers.
  • allocation type 2 i.e. allocating PRBs at selected frequencies based on CQI or CSI feedback, is found to be less effective in high speed scenarios.
  • UE 8 For a scheduled single-layer transmission, UE 8 identifies the resources allocated to the scheduled transmission using the resource allocation type pre-specified for the new "high-speed" transmission mode (STEP 710); and for a scheduled multi-layer transmission, UE 8 both identifies the resources allocated to the scheduled transmission using the resource allocation type pre-specified for the new "high-speed” transmission mode, and processes the signals of the multi-layer transmission according to the antenna ports, scrambling identity and number of layers pre-specified for multi-layer transmissions according to the new high-speed transmission mode (STEP 708).
  • UE 8 is a relay node located on a high speed train, and the train relay node 8 functions to relay data from eNB 2 to individual communication devices on the high-speed train.
  • eNB is configured to allocate all PRBs in said TTI (i.e. all 50PRBs in the case of a 10MHz system) to transmissions to said train relay node 8.
  • This technique has the advantage that the downlink control information to the train relay node 8 for that TTI does not need to include a resource allocation bit mask, whereby the overhead for downlink control information can be significantly reduced.
  • eNB 2 could allocate all of the TTIs for that short period to transmissions to the train relay node 8.
  • eNB 2 could allocate all TTIs for that short period to transmissions to the train relay nodes 8 of the two high speed trains, and schedule the two train relay nodes 8 alternatively in the time domain, e.g.
  • TTIs even-numbered subframes
  • TTIs odd-numbered subframes
  • Figures 8 and 9 together illustrate how this can achieve an improvement in performance.
  • Figure 8 shows error rates for transmissions involving the despreading of DM-RS at the receiver
  • Figure 9 shows error rates for transmissions without despreading of DM-RS at the receiver.
  • the above-described operations may require data processing in the various entities.
  • the data processing may be provided by means of one or more data processors.
  • various entities described in the above embodiments may be implemented within a single or a plurality of data processing entities and/or data processors.
  • Appropriately adapted computer program code product may be used for implementing the embodiments, when loaded to a computer.
  • the program code product for providing the operation may be stored on and provided by means of a carrier medium such as a carrier disc, card or tape. A possibility is to download the program code product via a data network. Implementation may be provided with appropriate software in a server.
  • the embodiments of the invention may be implemented as a chipset, in other words a series of integrated circuits communicating among each other.
  • the chipset may comprise microprocessors arranged to run code, application specific integrated circuits (ASICs), or programmable digital signal processors for performing the operations described above.
  • ASICs application specific integrated circuits
  • programmable digital signal processors for performing the operations described above.
  • Embodiments of the invention may be practiced in various components such as integrated circuit modules.
  • the design of integrated circuits is by and large a highly automated pro- cess.
  • Complex and powerful software tools are available for converting a logic level design into a semiconductor circuit design ready to be etched and formed on a semiconductor substrate.
  • Programs such as those provided by Synopsys, Inc. of Mountain View, California and Cadence Design, of San Jose, California automatically route conductors and locate components on a semiconductor chip using well established rules of design as well as libraries of pre stored design modules.
  • the resultant design in a standardized electronic format (e.g., Opus, GDSII, or the like) may be transmitted to a semiconductor fabrication facility or "fab" for fabrication.
  • a standardized electronic format e.g., Opus, GDSII, or the like

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

Abstract

L'invention porte sur une technique consistant à : en réponse à une indication qu'un dispositif de communication change sa position physique à une vitesse supérieure à un seuil prédéterminé, sélectionner, pour des transmissions à destination dudit dispositif de communication, un mode de transmission selon lequel : des symboles de données sont transmis ensemble avec des symboles de référence conformément au même précodage que lesdits symboles de données ; des symboles de données et des symboles de référence partagent une matrice de précodage commune sur une pluralité de blocs de ressource ; et des transmissions multicouches comprennent la transmission de symboles de référence pour une pluralité de couches par l'intermédiaire de paires partagées d'éléments de ressource utilisant des codes de recouvrement orthogonaux conformément auxquels aucun désétalement n'est requis au niveau du dispositif de communication.
EP12878373.5A 2012-06-07 2012-06-07 Transmissions à destination de dispositifs à grande vitesse Withdrawn EP2859773A4 (fr)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
PCT/CN2012/076611 WO2013181831A1 (fr) 2012-06-07 2012-06-07 Transmissions à destination de dispositifs à grande vitesse

Publications (2)

Publication Number Publication Date
EP2859773A1 true EP2859773A1 (fr) 2015-04-15
EP2859773A4 EP2859773A4 (fr) 2016-01-06

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Publication number Priority date Publication date Assignee Title
US11956645B2 (en) * 2020-03-24 2024-04-09 Qualcomm Incorporated Detection of high speed train scenario and indication of high speed train (HST) mode

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CN101389064A (zh) * 2007-09-12 2009-03-18 瑞峰兴有限公司 无线传输语音数据的方法及系统
US8260356B2 (en) * 2009-06-18 2012-09-04 Samsung Electronics Co., Ltd. Method and system for indicating method used to scramble dedicated reference signals
US8582516B2 (en) 2009-11-09 2013-11-12 Qualcomm Incorporated Reference signaling for a high-mobility wireless communication device
MX2012007390A (es) * 2010-01-20 2012-07-23 Ericsson Telefon Ab L M Metodo de mapeo de puerto de antena y dispositivo para desmodular señales de referencia.

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EP2859773A4 (fr) 2016-01-06

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