WO2007108751A2 - Procédé et appareil d'un système de télécommunication - Google Patents

Procédé et appareil d'un système de télécommunication Download PDF

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Publication number
WO2007108751A2
WO2007108751A2 PCT/SE2007/000272 SE2007000272W WO2007108751A2 WO 2007108751 A2 WO2007108751 A2 WO 2007108751A2 SE 2007000272 W SE2007000272 W SE 2007000272W WO 2007108751 A2 WO2007108751 A2 WO 2007108751A2
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WO
WIPO (PCT)
Prior art keywords
streams
stream
feedback
identity
mimo
Prior art date
Application number
PCT/SE2007/000272
Other languages
English (en)
Other versions
WO2007108751A3 (fr
Inventor
Per Johan Torsner
Shyam Chakraborty
Bo Göransson
Stefan Parkvall
Original Assignee
Telefonaktiebolaget L M Ericsson (Publ)
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 Telefonaktiebolaget L M Ericsson (Publ) filed Critical Telefonaktiebolaget L M Ericsson (Publ)
Publication of WO2007108751A2 publication Critical patent/WO2007108751A2/fr
Publication of WO2007108751A3 publication Critical patent/WO2007108751A3/fr

Links

Classifications

    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
    • H04L1/00—Arrangements for detecting or preventing errors in the information received
    • H04L1/02—Arrangements for detecting or preventing errors in the information received by diversity reception
    • H04L1/06—Arrangements for detecting or preventing errors in the information received by diversity reception using space diversity
    • H04L1/0618—Space-time coding
    • H04L1/0675—Space-time coding characterised by the signaling
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
    • H04L1/00—Arrangements for detecting or preventing errors in the information received
    • H04L1/12—Arrangements for detecting or preventing errors in the information received by using return channel
    • H04L1/16—Arrangements for detecting or preventing errors in the information received by using return channel in which the return channel carries supervisory signals, e.g. repetition request signals
    • H04L1/1607—Details of the supervisory signal
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
    • H04L1/00—Arrangements for detecting or preventing errors in the information received
    • H04L1/02—Arrangements for detecting or preventing errors in the information received by diversity reception
    • H04L1/06—Arrangements for detecting or preventing errors in the information received by diversity reception using space diversity
    • H04L1/0618—Space-time coding
    • H04L1/0631—Receiver arrangements
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
    • H04L1/00—Arrangements for detecting or preventing errors in the information received
    • H04L1/12—Arrangements for detecting or preventing errors in the information received by using return channel
    • H04L1/16—Arrangements for detecting or preventing errors in the information received by using return channel in which the return channel carries supervisory signals, e.g. repetition request signals
    • H04L1/18—Automatic repetition systems, e.g. Van Duuren systems
    • H04L1/1812—Hybrid protocols; Hybrid automatic repeat request [HARQ]
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
    • H04L1/00—Arrangements for detecting or preventing errors in the information received
    • H04L1/12—Arrangements for detecting or preventing errors in the information received by using return channel
    • H04L1/16—Arrangements for detecting or preventing errors in the information received by using return channel in which the return channel carries supervisory signals, e.g. repetition request signals
    • H04L1/18—Automatic repetition systems, e.g. Van Duuren systems
    • H04L1/1829—Arrangements specially adapted for the receiver end
    • H04L1/1835—Buffer management
    • H04L1/1845—Combining techniques, e.g. code combining
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
    • 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

Definitions

  • the present invention relates to methods and arrangements in cellular mobile communication systems, in particular to achieve a limited Multiple-Input Multiple-Output (MIMO) feedback.
  • MIMO Multiple-Input Multiple-Output
  • LTE Long Term Evolution
  • HARQ Hybrid Automatic Repeat-Request
  • UE user equipment
  • the transmission can be divided into one transport block per MIMO stream. If a CRC is added for each stream, transmission failure can be detected for each stream individually. To be able to make retransmissions of individual streams one bit ACK/NACK HARQ feedback per stream is needed, i.e. 4 bits for 4x4 MIMO.
  • Performing retransmissions of individual MIMO streams can however cause additional complexity in the transmitter, especially if the streams that are not retransmitted should be used to make new transmissions of other data.
  • Some discussions therefore suggest to perform retransmissions of individual MIMO streams but not to insert new data on the successful streams. Instead these streams are left empty and the available power can be used only on the retransmitted streams. This scheme however requires an indication of which streams that are retransmitted and which are "empty" unless a blind detection can be used based on power estimation.
  • the streams are decoded one by one.
  • the interference caused by this stream can be accounted for in the decoding of the following stream. That implies that with equal coding/modulation etc for each stream the error probability decreases for each decoded stream.
  • An alternative and more feasible choice is however to transmit an increasing amount of information in each stream e.g. so that the error probability for each stream is constant.
  • four MIMO streams are shown with different information data rate for each stream. The height of each bar illustrates the information data rate.
  • the streams may be explicitly ordered (e.g. the stream ID is indicated on a control channel) or the order can be implicitly derived from the data rate such that the streams are ordered in order of increasing data rate.
  • MIMO Multiple Input Multiple Output
  • This invention aims at reducing the feedback needed for a MIMO scheme using separate encoding per stream and possibly a successive interference cancellation based receiver, and targets the interaction between MIMO and the HARQ scheme that is deployed between the transmitter and the receiver.
  • the idea is focused on LTE but could in principle be applied in any wireless system
  • the solution according to the present invention aims at exploiting the properties caused by the successive interference cancellation to minimize the HARQ ACK/NACK feedback and minimizing the signalling needed in the forward direction by not indicating explicitly which streams that are retransmitted and instead using the fact that the receiver has information about which streams that where correctly received in the previous transmission attempt.
  • the system comprises receivers and transmitters for transmission of signal streams.
  • the method comprises: encoding each stream uniquely, indicating by the receiver an identity of the latest correctly decoded uniquely encoded stream used for retransmission decision.
  • the method may further use information about previously correct received stream.
  • a successive interference cancellation scheme is used for obtaining information about previously correct received stream.
  • the streams may implicitly or explicitly be ordered in order of increasing information bit rate.
  • the streams are decoded one by one in increasing stream order. If a certain stream, having a value, is not decoded, its interference is not accounted for in the decoding of the subsequent stream and the indication comprises an identity of a highest decoded stream.
  • the feedback is encoded as a number of bits, n, such that 2 n is equal to a maximum number of streams in the system and a transmitted feedback with the value means that all streams with an identity equal to or less the certain stream are retransmitted.
  • the coding may be modified such that the absence of a Hybrid Automatic Repeat-request (HARQ) ACK or NACK feedback indicates that all streams are to be retransmitted.
  • HARQ Hybrid Automatic Repeat-request
  • the method may further comprise using a certain number of bits for encoding and for indicating retransmissions and using bit values together with the certain number of bits.
  • the signalling is realized using different code words, different modulation or any other unique signalling.
  • a length of a HARQ ACK/NACK feedback is fixed to a maximum number of streams and using a coding depending on a number of configured or active streams.
  • a number of bits are used for: indicating an ACK/NACK for each stream individually, or indicating that same value (ACK or NACK) are combined to increase the reliability of the signaling.
  • ACK or NACK same value
  • the method may further comprise retransmission of individual streams whereby not retransmitted streams are empty.
  • information about a HARQ reception in a previous transmission attempt can be used.
  • Information may be received by a receiver, which sends HARQ NACKs for a stream in a previous transmission attempt, will be retransmitted and the remaining streams will be empty.
  • the method may be employed in at least one of MIMO, multiple transmit/receive systems such as Single-lnput-Multiple-Output (SIMO), or Multiple-Input- Single-Output (MISO).
  • SIMO Single-lnput-Multiple-Output
  • MISO Multiple-Input- Single-Output
  • the invention further relates to a communications network infrastructure arrangement in a communications network adopted for transmission of data streams from a number of transmitters to a number of receivers.
  • the arrangement comprises a portion for encoding each data stream uniquely, means for obtaining an identity of the latest correctly decoded uniquely encoded stream, and means for executing a retransmission based on the obtained identity.
  • the arrangement may be arranged to communicate with a number of receive/transmit antennas.
  • the arrangement is used in a MIMO system.
  • the invention also relates to a receiver for reception of a number of uniquely encoded data streams in a wireless communication network.
  • the receiver comprises means for controlling the received streams, means for deciding the quality of controlled streams and means for generation of an indication, an identity of the latest correctly decoded uniquely encoded stream in the controlling means.
  • Fig. 1 shows four MIMO streams with different information data rate for each stream
  • Fig. 2 is a schematic MIMO system
  • Fig. 3 is a block diagram illustrating an arrangement implementing the invention.
  • Fig. 4 is a block diagram illustrating a user unit implementing the invention.
  • Fig. 2 illustrates an exemplary and simplified MIMO system 100 constructed by MTx transmit antennas 103 and N Rx receive antennas 104.
  • the antenna spacing between the Tx antennas and Rx antennas in the MIMO system in Fig. 2 is generally big enough, to guarantee the spatial un-correlation of signals.
  • MIMO architecture unit 101 first transforms a channel of data stream into M channels of parallel sub data streams; then, multiple access transform unit 102 performs multiplex processing; finally, the corresponding MTx antennas 103 transmit the signal simultaneously into the wireless channels.
  • the MIMO architecture unit 101 can adopt any one of the MIMO processing methods, such as STTC (Space Time Trellis Code), space-time block code, space-time Turbo code, BLAST code and etc.
  • STTC Space Time Trellis Code
  • the MIMO streams are implicitly or explicitly ordered in order of increasing information bit rate.
  • successive interference cancellation SIC
  • the streams are decoded one by one in increasing stream order. If a certain stream k can not be decoded, its interference can not be accounted for in the decoding of the subsequent stream k+1.
  • the probability that a stream can be decoded when the decoding of any stream with lower order has failed is therefore low (assuming that the information bitrates are increasing to exploit the gains of successive interference cancellation). It is therefore feasible to design a HARQ ACK/NACK feedback that indicates the ID of the highest decoded stream instead of indicating an ACK/NACK feedback for each stream individually.
  • the invention is not limited SIC receivers and the method of the invention can be applied as soon as a stream is decoded separately.
  • the HARQ feedback is encoded as, e.g., a number of bits n such that 2 n is equal to the maximum number of MIMO streams in the system.
  • a transmitted HARQ feedback with the value k means that all MIMO streams with an identity equal to or less then k shall be retransmitted. For 4x4 MIMO this means that 2 bits can be used instead of 4 bits for the HARQ feedback and still exploit most of the gains retransmissions of individual streams.
  • the coding may be modified so that the absence of HARQ ACK/NACK feedback indicates that all streams shall be retransmitted.
  • this signalling can be realized in many ways, e.g., as different code words, different modulation or any other unique signalling.
  • the length of the HARQ ACK/NACK feedback is fixed to the maximum number of MIMO streams but the coding used is depending on the number of currently configured or active MIMO streams. For instance, if a maximum of 4 MIMO streams are supported, the ACK/NACK feedback consists of 2 bits. When 4 MIMO streams are configured or active the 2 bits are coded as described in the first embodiment. When two MIMO streams are configured or active the two (2) bits are used to indicate the ACK/NACK for each MIMO streams individually. And when single stream transmission is used the 2 bits indicate the same value (ACK or NACK) and are combined to increase the reliability of the signalling, e.g. by means of soft combining of the two messages.
  • the maximum number of transport blocks in LTE may be 2. If 4x4 MIMO is used, then one transport block may be mapped to 2 layers (e.g. antennas). According to a third embodiment of the present invention it is assumed that retransmission of individual streams are performed and that the streams that are not retransmitted are empty, i.e. no power is transmitted on those streams.
  • the information about the HARQ reception in the previous transmission attempt is used. I.e. the receiver knows that the streams it sent HARQ NACKs for in the previous transmission attempt will be retransmitted and the other streams will be empty. This requires an interaction between HARQ and MIMO.
  • the invention may be implemented in a network node based on a MIMO system.
  • the network node may comprise a computer unit 300 for processing signals, as illustrated very simply and schematically in Fig. 3.
  • the network comprises receivers and transmitters (Fig.
  • the computer unit 300 may comprise a unit 310 for detecting the transmitted data stream, encoding/decoding each stream uniquely, a processing unit 320 for processing the data stream and indicating the identity of correctly decoded encoded streams and memory means 330 for storing data application programs.
  • Fig. 4 illustrates in a schematic block diagram a user equipment (UE) 400 implementing teachings of the present invention, wherein a processing unit 420 handles communication data and communication control information.
  • the UE 400 further comprises a volatile (e.g. RAM) 430 and/or non volatile memory (e.g. a hard disk or flash disk) 440, an interface unit 450.
  • the UE 400 may further comprise a mobile communication unit 460 with a respective connecting interface. All units in the UE can communicate with each other directly or indirectly through the processing unit 470.
  • Software for implementing the method according to the present invention may be executed within the UE 400.
  • the UE 400 may also comprise an interface 480 for communicating with an identification unit, such as a SIM card, for uniquely identifying the UE in a network and for use in the identification of the 'SIGN' (i.e. traffic counting and digital signature of the UE).
  • an identification unit such as a SIM card
  • Other features often present in UE are not shown in Fig. 4 but should be understood by the person skilled in the art, e.g. for a mobile phone: MIMO antennas 410, camera, replaceable memory, screen and buttons.
  • the computer unit according Fig. 3 may be implemented as an additional part or part of the processing unit.
  • the invention is not limited to MIMO systems and may be implemented in any multiple transmit/receive systems such as Single-lnput-Multiple-Output (SIMO) 1 Multiple-lnput- Single-Output (MISO), etc.
  • SIMO Single-lnput-Multiple-Output
  • MISO Multiple-lnput- Single-Output

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  • Engineering & Computer Science (AREA)
  • Computer Networks & Wireless Communication (AREA)
  • Signal Processing (AREA)
  • Detection And Prevention Of Errors In Transmission (AREA)
  • Reduction Or Emphasis Of Bandwidth Of Signals (AREA)

Abstract

La présente invention concerne un procédé et des appareils permettant de diminuer la signalisation dans un système de communication par réduction de la signalisation de transmission de rétroaction et/ou directe. Ce système comprend des récepteurs et des émetteurs conçus pour la transmission de flux de signaux. Chaque flux est codé. Le récepteur indique une identité du dernier flux codé de façon unique et décodé correctement.
PCT/SE2007/000272 2006-03-20 2007-03-20 Procédé et appareil d'un système de télécommunication WO2007108751A2 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
SE0600634 2006-03-20
SE0600634-0 2006-03-20

Publications (2)

Publication Number Publication Date
WO2007108751A2 true WO2007108751A2 (fr) 2007-09-27
WO2007108751A3 WO2007108751A3 (fr) 2007-12-13

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Cited By (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2010011410A2 (fr) * 2008-07-11 2010-01-28 Qualcomm Incorporated Systèmes et procédés pour une annulation d'interférence intercellule de liaison montante à l'aide de retransmissions à demande de répétition automatique hybride (harq)
US8867999B2 (en) 2009-01-26 2014-10-21 Qualcomm Incorporated Downlink interference cancellation methods
US9119212B2 (en) 2008-07-11 2015-08-25 Qualcomm Incorporated Inter-cell interference cancellation framework
WO2018084971A1 (fr) * 2016-11-02 2018-05-11 Intel Corporation Émission de couches mimo (entrées et sorties multiples) pour nr (nouvelle radio)

Citations (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US20060018259A1 (en) * 2004-07-20 2006-01-26 Tamer Kadous Mitigating ACK/NACK errors in MIMO/SIC/HARQ

Patent Citations (1)

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Publication number Priority date Publication date Assignee Title
US20060018259A1 (en) * 2004-07-20 2006-01-26 Tamer Kadous Mitigating ACK/NACK errors in MIMO/SIC/HARQ

Non-Patent Citations (2)

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Title
GRANT S. ET AL.: 'Per-antenna-rate-control (Parc) in frequency selective fading with SIC-GRAKE receiver' VEHICULAR TECHNOLOGY CONFERENCE, 2004. VTC2004-FALL. 2004 IEEE 60TH vol. 2, 26 September 2004 - 29 September 2004, pages 1458 - 1462, XP010786866 *
ZHENG H. ET AL.: 'Multiple ARQ processes for MIMO systems' PERSONAL, INDOOR AND MOBILE RADIO COMMUNICATIONS, 2002. THE 13TH IEEE INTERNATIONAL SYMPOSIUM vol. 3, 15 September 2002 - 18 September 2002, pages 1023 - 1026, XP003013607 *

Cited By (11)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2010011410A2 (fr) * 2008-07-11 2010-01-28 Qualcomm Incorporated Systèmes et procédés pour une annulation d'interférence intercellule de liaison montante à l'aide de retransmissions à demande de répétition automatique hybride (harq)
WO2010011410A3 (fr) * 2008-07-11 2010-03-18 Qualcomm Incorporated Systèmes et procédés pour une annulation d'interférence intercellule de liaison montante à l'aide de retransmissions à demande de répétition automatique hybride (harq)
TWI393412B (zh) * 2008-07-11 2013-04-11 Qualcomm Inc 細胞服務區間干擾消除框架
US8630587B2 (en) 2008-07-11 2014-01-14 Qualcomm Incorporated Inter-cell interference cancellation framework
US8639996B2 (en) 2008-07-11 2014-01-28 Qualcomm Incorporated Systems and methods for uplink inter-cell interference cancellation using hybrid automatic repeat request (HARQ) retransmissions
US9119212B2 (en) 2008-07-11 2015-08-25 Qualcomm Incorporated Inter-cell interference cancellation framework
US8867999B2 (en) 2009-01-26 2014-10-21 Qualcomm Incorporated Downlink interference cancellation methods
US10820327B2 (en) 2009-01-26 2020-10-27 Qualcomm Incorporated Downlink interference cancellation methods
US11039449B2 (en) 2009-01-26 2021-06-15 Qualcomm Incorporated Downlink interference cancellation methods
WO2018084971A1 (fr) * 2016-11-02 2018-05-11 Intel Corporation Émission de couches mimo (entrées et sorties multiples) pour nr (nouvelle radio)
EP3905564A1 (fr) * 2016-11-02 2021-11-03 Apple Inc. Émission de couches mimo (entrées et sorties multiples) pour nr (nouvelle radio)

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Publication number Publication date
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