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WO2013063781A1 - Transmissions entre plusieurs cellules - Google Patents

Transmissions entre plusieurs cellules Download PDF

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Publication number
WO2013063781A1
WO2013063781A1 PCT/CN2011/081731 CN2011081731W WO2013063781A1 WO 2013063781 A1 WO2013063781 A1 WO 2013063781A1 CN 2011081731 W CN2011081731 W CN 2011081731W WO 2013063781 A1 WO2013063781 A1 WO 2013063781A1
Authority
WO
WIPO (PCT)
Prior art keywords
data unit
cell
physical layer
duplicate
communication device
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/CN2011/081731
Other languages
English (en)
Inventor
Peter Skov
Chunye Wang
Lilei Wang
Xiaoyi 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 Siemens 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 Siemens Networks Oy filed Critical Nokia Siemens Networks Oy
Priority to PCT/CN2011/081731 priority Critical patent/WO2013063781A1/fr
Publication of WO2013063781A1 publication Critical patent/WO2013063781A1/fr
Anticipated expiration legal-status Critical
Ceased legal-status Critical Current

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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
    • H04B7/022—Site diversity; Macro-diversity

Definitions

  • a mobile telecommunication network comprising an array of cells can be used to provide mobile telecommunication services to a communication device.
  • Examples of mobile telecommunication services include communication of voice, electronic mail (email), text messages, data, multimedia etc..
  • a mobile telecommunication network typically operates in accordance with a wireless standard. Examples include GSM (Global System for Mobile) EDGE (Enhanced Data for GSM Evolution) Radio Access Networks (GERAN), Universal Terrestrial Radio Access Networks (UTRAN), and evolved Universal Terrestrial Radio Access Networks (EUTRAN).
  • GSM Global System for Mobile
  • EDGE Enhanced Data for GSM Evolution
  • GERAN Universal Terrestrial Radio Access Networks
  • UTRAN Universal Terrestrial Radio Access Networks
  • EUTRAN evolved Universal Terrestrial Radio Access Networks
  • One downlink transmission technique aimed at reducing transmission errors involves coordinating signals from a plurality of transmission points associated with a single cell.
  • One downlink transmission technique involving the coordination of signals from transmission points in different cells includes coordinating the transmission points at the Physical Layer of the Open Systems Interconnection (OSI) model.
  • OSI Open Systems Interconnection
  • a method comprising: in a cellular communications system involving the transfer of data units to a physical layer from a higher layer for communication to a communication device: processing at the physical layer for a first cell a data unit of which a duplicate is also processed at the physical layer for another, second cell; and transmitting to said communication device an indication of the processing at the physical layer of said data unit and said duplicate of said data unit, which indication triggers the communication device to configure itself to recover said data unit from signals transmitted by both said first and second cells.
  • an apparatus for use at a radio access network entity in a cellular communications system involving the transfer of data units to a physical layer from a higher layer for communication to a communication device
  • said apparatus comprising: a processor and memory including computer program code, wherein the memory and computer program code are configured to, with the processor, cause the apparatus to: process at the physical layer for a first cell a data unit of which a duplicate is also processed at the physical layer for another, second cell; and transmit to said communication device an indication of the processing at the physical layer of said data unit and said duplicate of said data unit, which indication triggers the communication device to configure itself to recover said data unit from signals transmitted by both said first and second cells.
  • a computer program product comprising program code means which when loaded into a computer controls the computer to: process at the physical layer for a first cell a data unit of which a duplicate is also processed at the physical layer for another, second cell; and transmit to said communication device an indication of the processing at the physical layer of said data unit and said duplicate of said data unit, which indication triggers the communication device to configure itself to recover said data unit from signals transmitted by both said first and second cells.
  • said indication is included in downlink control information for at least the first cell signal corresponding to said data unit.
  • a common data unit identifier is included in both downlink control information for the first cell signal corresponding to said data unit, and downlink control information for the second cell signal corresponding to said duplicate of said data unit.
  • one or more cell identifiers recognisable to the communication device as cell identifiers associated with the transmission by said first and second cells of signals corresponding to a data unit and its duplicate are included in both the downlink control information for the first cell signal corresponding to said data unit, and the downlink control information for the second cell signal corresponding to said duplicate of said data unit.
  • One embodiment includes receiving from said communication device an indication of an error in the recovery of said data unit from said first and second cell signals, and deciding whether to (i) retransmit said data unit from one of said first and second cells or (ii) retransmit said data unit and a duplicate of said unit from said first and second cells.
  • One embodiment includes scheduling the transmission from said first cell of a signal for said data unit independently of the scheduling of the transmission from said second cell of a signal for said duplicate.
  • said processing of said data unit at the physical layer for said first cell is performed without coordination to the processing of said duplicate at the physical layer for said second cell.
  • a method comprising: in a cellular communications system involving the transfer of data units to a physical layer from a higher layer for communication to a communication device: detecting at said communication device an indication of the processing at the physical layer for a first cell of a data unit and the processing at the physical layer for a second cell of said duplicate of said data unit; and in response to said detecting, configuring the communication device to recover said data unit from signals transmitted by both said first and second cells.
  • an apparatus for use at a communication device in a cellular communications system involving the transfer of data units to a physical layer from a higher layer for communication to said communication device comprising: a processor and memory including computer program code, wherein the memory and computer program code are configured to, with the processor, cause the apparatus to: check at said communication device for an indication of the processing at the physical layer for a first cell of a data unit and the processing at the physical layer for a second cell of said duplicate of said data unit; and in response to any detection of said indication, configure the communication device to recover said data unit from signals transmitted by both said first and second cells.
  • a computer program product comprising program code means which when loaded into a computer controls the computer to: check at said communication device for an indication of the processing at the physical layer for a first cell of a data unit and the processing at the physical layer for a second cell of said duplicate of said data unit; and in response to any detection of said indication, configure the communication device to recover said data unit from signals transmitted by both said first and second cells.
  • One embodiment includes: separately decoding the first and second signals corresponding to said data unit and said duplicate; and combining the bits resulting from said decoding.
  • One embodiment includes: performing a transmission error check on the result of said combining.
  • One embodiment includes: in the event of an error in the recovery of said data unit from said first and second cell signals for said data unit and said duplicate;
  • the transmission from said first cell of a signal for said data unit is scheduled independently of the transmission from said second cell of a signal for said duplicate.
  • said processing of said data unit at the physical layer for said first cell is performed without coordination to the processing of said duplicate at the physical layer for said second cell.
  • Figure 1 illustrates a plurality of cells under the control of one eNodeB
  • Figure 2 illustrates the functional entities of the eNodeB of Figure 1 ;
  • Figure 3 schematically illustrates an example of an apparatus suitable for use at the eNodeB of Figure 1 ;
  • Figure 4 schematically illustrates an example of an apparatus suitable for use at the remote radio units of Figure 1 ;
  • Figure 5 schematically illustrates an example of an apparatus suitable for use at the user equipment of Figure 1 ;
  • Figure 6 illustrates an example of operations at the eNodeB of Figure ;
  • Figure 7 illustrates an example of operations at the user equipment of Figure 1.
  • FIG. 1 illustrates a pair of overlapping cells A and B of a mobile telecommunication network (MTN) under the control of a single eNodeB (eNB) 4. Only two cells are shown in Figure 1 , but a mobile telecommunication network will typically comprise tens of thousands of cells.
  • MTN mobile telecommunication network
  • eNB eNodeB
  • the eNB 4 includes respective Data Link Layer (Layer 2 of the OSI Model) functional entities 22/24 and Physical Layer (Layer 1 of the OSI Model) functional entities 26 for each cell that the eNB 4 controls.
  • the Data Link Layer entities include Radio Link Control (RLC) sub-layer entities 22 and Medium Access Control (MAC) sub-layer entities 24,
  • RLC Radio Link Control
  • MAC Medium Access Control
  • the Physical Layer entities 26 process data units from the respective Data Link Layer entities 22/24 into signals for transmission by respective remote radio units (RRUs) 2 connected to the eNB 4 by respective fixed wired links.
  • Figure 3 shows a schematic partially sectioned view of an example of user equipment 6 that may be used for receiving transmissions from cells A and B.
  • the user equipment (UE) 6 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 6 may be any device capable of at least receiving radio signals from cells A and B.
  • 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 6 may communicate via an appropriate radio interface arrangement of the UE 6.
  • 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 6.
  • the UE 6 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 6 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 6 may comprise appropriate connectors (either wired or wireless) to other devices and/or for connecting external accessories, for example hands-free equipment, thereto.
  • FIG. 4 shows an example of apparatus for use at the RRUs 2.
  • the apparatus comprises a radio frequency antenna 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 antenna 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 the eNB 4.
  • 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.
  • Figure 4 shows an example of apparatus for use at the eNB 4.
  • the apparatus comprises an interface 406 via which it can communicate via a wired link with the RRUs and other network entities (not shown).
  • the data processor 402 is configured to process downlink data received at the interface 406 and send signals via the interface 406 to the RRUs 2 for wireless transmission by the RRUs 2.
  • the memory 404 is used for storing data, parameters and instructions for use by the data processor 402.
  • the apparatus shown in each of figures 3, 4 and 5 and described above may comprise further elements which are not directly involved with the embodiments of the invention described hereafter.
  • a Packet Data Convergence Protocol (PDCP - OSI Model Layer 3) packet data unit (PDU) is received as an RLC service data unit (SDU) at the RLC entity 22a for cell A.
  • the RLC entity 22a for cell A adds the RLC SDU to its transmission buffer.
  • the RLC entity 22a for cell A segments the RLC SDU into a plurality of RLC PDUs, adds a RLC header to each PLC PDU, passes the RLC PDUs to the MAC entity 24a for cell A and passes an exact duplicate of the RLC PDUs to the MAC entity 24b for cell B (STEP 602 of Figure 6).
  • the MAC entities 24a, 24b for cells A and B perform identical segmentation of each RLC PDU into identical sets of smaller data units (codewords) (STEPS 604A and 604B of Figure 6) and these smaller data units are processed at the Physical Layer entities 26a, 26b for cells A and B.
  • codewords is processed at the Physical Layer entity into a signal for transmission to the communication device from the respective cell via the Physical Downlink Shared Channel (PDSCH) for the respective cell.
  • PDSCH Physical Downlink Shared Channel
  • the transmission of these PDSCH signals is accompanied by (i) downlink control information (DCI) for the PDSCH signals, including the modulation and coding scheme (MCS) for the respective PDSCH signal, and the radio-resources (time-frequency resources) scheduled for the respective PDSCH signal, and (ii) an indication that the same codeword is being processed at the Physical Layer entities of both cells A and B and transmitted as PDSCH signals by both cells A and B (STEPS 606A and 606B of Figure 6).
  • DCI downlink control information
  • MCS modulation and coding scheme
  • UE 6 configures itself to perform soft-combining on the results of turbo- decoding the respective PDSCH signals detected on those scheduled resources (STEPS 704 and 706 of Figure 7). Reduction in transmission errors can be achieved with soft-combining, because it is possible that each of the two PDSCH signals could not on its own be processed back into a data unit without error, but that the soft combination of the two PDSCH signals could be proceed back into a data unit without error.
  • the result of the error check on the soft combination of the two PDSCH signals is communicated back to both cell A and cell B according to a Hybrid ARQ (HARQ) technique (STEP 708 of Figure 7).
  • HARQ Hybrid ARQ
  • a retransmission of a codeword that has failed the error check could be made from only one of cells A and B or from both of cells A and B, in accordance with a decision by the eNodeB 4.
  • Information about which PDSCH signal transmitted by cell B is for the same codeword as a PDSCH signal transmitted by cell A could, for example, be communicated using a combination of (i) an indicator in the carrier indicator field (GIF) included in the downlink control information (DC1) format for the purpose of cross-carrier scheduling in a carrier aggregation technique, and the HARQ processing number also included in downlink control information.
  • GIF carrier indicator field
  • DC1 downlink control information
  • Some of the CIF bits that are provided in the DC) Format for cross-carrier scheduling purposes but are not actually completely used for cross-carrier scheduling purposes are used to indicate to UE 6 that the PDSCH signal to which the DCI relates is for a codeword that is also being transmitted as a PDSCH signal by cell B.
  • an additional HARQ machine is constructed for streams of codewords transmitted by both cells A and B (i.e. in addition and separate to any HARQ machines constructed for streams of codewords transmitted by cell A only or cell B only).
  • PDSCH signals from cells A and B that are accompanied by respective DCI including both (a) the above- mentioned CIF indication of the joint transmission of the same codeword by cells A and B and (b) the same HARQ processing number, are recognised by UE 6 as PDSCH signals for the same codeword and are subjected to the soft-combining operation described above.
  • information about which cell B PDSCH signal is for the same codeword as a PDSCH signal transmitted by cell A could be provided by including in the DCI for each codeword transmission a MAC PDU index for that codeword.
  • the UE configures itself to process the cell A and B PDSCH signals accompanied by said downlink control information as described above, i.e. by performing soft- combining on the results of turbo-decoding those PDSCH signals.
  • the above-mentioned techniques may or may not be accompanied by additional coordination at the Physical Layer.
  • the exact transmission parameters (such as physical resource block allocation, MCS selection, redundancy version, and TTI index) for the two PDSCH signals (i.e.
  • the above-described technique is that the reduction in transmission errors achievable by soft-combining of transmissions from a plurality of transmission points can be realised without the need for coordination of scheduling decisions, link adaptation and precoding.
  • 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.
  • 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 process.

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

Abstract

L'invention a trait à une technique comprenant, dans un système de communications cellulaires qui implique le transfert d'unités de données destinées à être communiquées à un dispositif de communication en rejoignant une couche physique tout en partant d'une couche supérieure : le traitement, sur la couche physique et pour une première cellule, d'une unité de données dont le double est également traité sur la couche physique pour une autre cellule, autrement dit une seconde cellule; et la transmission audit dispositif de communication d'une indication du traitement sur la couche physique de ladite unité de données et de son double, cette indication déclenchant la configuration autonome du dispositif de communication dans le but de récupérer l'unité de données dans les signaux transmis par la première et la seconde cellule.
PCT/CN2011/081731 2011-11-03 2011-11-03 Transmissions entre plusieurs cellules Ceased WO2013063781A1 (fr)

Priority Applications (1)

Application Number Priority Date Filing Date Title
PCT/CN2011/081731 WO2013063781A1 (fr) 2011-11-03 2011-11-03 Transmissions entre plusieurs cellules

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
PCT/CN2011/081731 WO2013063781A1 (fr) 2011-11-03 2011-11-03 Transmissions entre plusieurs cellules

Publications (1)

Publication Number Publication Date
WO2013063781A1 true WO2013063781A1 (fr) 2013-05-10

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PCT/CN2011/081731 Ceased WO2013063781A1 (fr) 2011-11-03 2011-11-03 Transmissions entre plusieurs cellules

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Citations (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN101027858A (zh) * 2004-09-22 2007-08-29 三星电子株式会社 无线承载信息及使用其的网络的信号发送方法
WO2010149293A1 (fr) * 2009-06-26 2010-12-29 Deutsche Telecom Ag Procédé et programme de modification de canal dans une cellule d'un réseau d'accès radio mobile

Patent Citations (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN101027858A (zh) * 2004-09-22 2007-08-29 三星电子株式会社 无线承载信息及使用其的网络的信号发送方法
WO2010149293A1 (fr) * 2009-06-26 2010-12-29 Deutsche Telecom Ag Procédé et programme de modification de canal dans une cellule d'un réseau d'accès radio mobile

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