WO2007084065A2 - Procédé et configuration dans un système de télécommunications - Google Patents

Procédé et configuration dans un système de télécommunications Download PDF

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Publication number
WO2007084065A2
WO2007084065A2 PCT/SE2007/050022 SE2007050022W WO2007084065A2 WO 2007084065 A2 WO2007084065 A2 WO 2007084065A2 SE 2007050022 W SE2007050022 W SE 2007050022W WO 2007084065 A2 WO2007084065 A2 WO 2007084065A2
Authority
WO
WIPO (PCT)
Prior art keywords
feedback information
information elements
hybrid arq
feedback
multiplexed
Prior art date
Application number
PCT/SE2007/050022
Other languages
English (en)
Other versions
WO2007084065A3 (fr
Inventor
Stefan Parkvall
Erik Dahlman
Jung-Fu Cheng
Original Assignee
Telefonaktiebolaget Lm 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 Lm Ericsson (Publ) filed Critical Telefonaktiebolaget Lm Ericsson (Publ)
Publication of WO2007084065A2 publication Critical patent/WO2007084065A2/fr
Publication of WO2007084065A3 publication Critical patent/WO2007084065A3/fr

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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
    • H04L1/12—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
    • H04L1/12—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
    • H04L2001/0092—Error control systems characterised by the topology of the transmission link
    • H04L2001/0096—Channel splitting in point-to-point links

Definitions

  • the present invention relates to methods and arrangements in cellular mobile communication systems, in particular to methods and arrangements for transmitting of multiple feedback information elements .
  • High-Speed Downlink Packet Access (HSDPA) or WCDMA enhanced uplink (HSUPA)
  • HSDPA High-Speed Downlink Packet Access
  • HSUPA WCDMA enhanced uplink
  • LTE long-term evolution
  • a base station transmits a data packet to a user equipment, e.g. a mobile terminal, which attempts to decode this packet and provides a feedback in the form of a positive acknowledgement (ACK), i.e. the packet has been correctly decoded, or a negative acknowledgement (NAK), i.e. the decoding attempt has failed.
  • ACK positive acknowledgement
  • NAK negative acknowledgement
  • the base station receives a negative acknowledgement
  • the packet is retransmitted and the terminal then tries to combine the retransmitted data packet with the data packet of the original transmission attempt to make an attempt to decode this combination.
  • a status message informing the base station about the success or failure is sent and, if needed, subsequent retransmissions may take place.
  • WCDMA enhanced uplink although the direction is reversed, i.e., the terminal transmits the packet and the base station performs the decoding
  • a transmitting station 16 transmits a packet 10 to a receiving station 17 whereupon, after a predefined time 16 for receiver processing, the receiving station 17 transmits a single bit indicating a positive or negative acknowledgement back to the transmitting station 16. In case of a transmission failure 11 when transmitting the packet to the receiving station, the receiving station 17 returns a negative feedback message 12. In cases of no transmission failures 13, the receiving station 17 returns a positive feedback message 14.
  • the time relation 16 between the packet transmission and the corresponding feedback transmission is known, it is implicitly also known which hybrid ARQ process the acknowledgement relates to; there is thus no need to include a process number in the feedback message.
  • LTE-systems will support both frequency-division duplex (FDD) and time-division duplex (TDD) as illustrated in figure 2.
  • FDD frequency-division duplex
  • TDD time-division duplex
  • uplink 21a and downlink 21b transmissions are separated in frequency.
  • uplink transmissions 21a can therefore take place regardless of whether there is a downlink transmission 21b or not.
  • uplink 23a and downlink 23b transmissions are separated in time.
  • uplink transmissions 23a cannot take place at the same time as downlink transmissions 23b (and vice versa) .
  • Yet another alternative may relate to a combined FDD/TDD transmission 22.
  • LTE-systems will also support multi-stream transmissions, also known as MIMO (multiple-input, multiple-output).
  • MIMO multiple-input, multiple-output
  • both the transmitter and the receiver are equipped with multiple antennas.
  • the feedback scheme described above assumes a fixed delay between the reception of the data transmission and the transmission of the acknowledgements .
  • Such a scheme works well in FDD, where the feedback message (the ACK or NAK) can be transmitted at any time. In TDD, however, there may not be an uplink transmission slot available when the acknowledgement should be transmitted.
  • the scheme can still be applied if the timing relation is redefined in such a way that the feedback message is transmitted at the first available uplink transmission slot after a certain time.
  • the data transmitter can then still relate the feedback messages to a given hybrid ARQ process .
  • Figure 4 illustrates an exampel where no uplink slot (UL) is available for transmitting the ACK- or NAK- feedback related to a first downlink transmission (DL) .
  • UL uplink slot
  • DL first downlink transmission
  • the feedback transmission related to said first downlink transmission can be postponed to the first available uplink slot, this would however cause an ambiguity with regard to the downlink transmission that the ACK/NAK- feedback in the uplink slot relates to.
  • the present invention aims to solve the problem of transmitting multiple feedback messages, e.g. positive or negative acknowledgements, at a single time instant without any resorting for defining multiple structures for the feedback signaling. It is thus the basic idea of the present invention to transmit multiple feedback messages, e.g. positive or negative acknowledgements, at the same time in such a way that the linkage between a certain feedback message and a certain hybrid ARQ process (and/or MIMO stream) remains unambiguous.
  • the present invention implies the advantage that, if the number of ACK/NAKs to be transmitted at a certain time instant is smaller then the maximum number the system is designed to support, the reliability of each ACK/NAK is increased (which can be translated into a lower transmission power) .
  • Figure 1 illustrates a multiple hybrid ARQ-process.
  • Figure 2 illustrates schematically FDD and TDD transmission schemes .
  • Figure 3 illustrates schematically a MIMO-transmission scheme.
  • Figure 4 illustrates problems that can occur in case of multiple transmissions in one direction without possibility to send a feedback message in the reverse direction.
  • Figure 5 illustrates a time multiplexing with multiple ACK/NAK in a single time slot.
  • Figure 6 illustrates a code multiplexing of multiple ACK/NAK in a single time slot.
  • Figures 7a and 7b show two examples of schematic illustrations of a minimum distance, whereof figure 7a shows the case of a single ACK/NAK and figure 7b shows the case of two ACK/NAK.
  • Figure 8 illustrates a part of a telecommunication network within which the present invention can be applied.
  • Yet another scenario where multiple ACK/NAKs are of interest is a packet-centric retransmission protocol.
  • multiple packets transmitted during the same time interval need one hybrid ARQ process each, i.e., multiple stop-and- wait hybrid ARQ processes for a single time slot (as opposed to only one process per time slot for HSDPA) .
  • multiple ACK/NAKs may need to be fed back at the same time instant.
  • a series of multiple independent feedback messages are transmitted in each feedback message.
  • the first feedback relates to the data transmission (or hybrid ARQ process) in slot n-k
  • the second feedback relates to the data transmission (hybrid ARQ process) in slot (n-k-1) and so on.
  • a feedback message that cannot be transmitted at the desired time instant e.g. due to the lack of an uplink slot in a TDD system, can be transmitted at a later time instant. This implies that in cases where there is only a single ACK/NAK to be transmitted some of the bit fileds in the feedback message remain unused.
  • ACK/NAK3 53 and ACK/NAK4 54 both are unused but still occupy bandwidth in the feedback channel. Furthermore, the transmission power has to be set taking the short duration of each ACK/NAK into account, while the power amplifier is not fully used during the latter part of the feedback message, i.e. related to ACK/NAK3 and ACK/NAK4, in figure 5.
  • each feedback signal 61 e.g. positive or negative acknowledgements
  • an (orthogonal) code sequence 62 e.g. a Walsh code
  • code sequences 63 related to a data transmission in slot (n-k) and code sequences 64 related to a data transmission in slot (n-k-1) are used to modulate an (orthogonal) code sequence 62, e.g. a Walsh code, such as to distinguish code sequences 63 related to a data transmission in slot (n-k) and code sequences 64 related to a data transmission in slot (n-k-1) .
  • Each hybrid ARQ process that is to be acknowledged at the same time is assigned a specific code sequence. This implies the advantage of a more efficient power usage in the typical case that feedback information needs to be transmitted only for some previous slots.
  • the probability of a misdetection of the different ACK/NAKs is smaller the smaller the number of ACK/NAKs that are to be multiplexed. This means, in terms of mutual distance between the possible signal points, that the distance is larger in the case of a single ACK/NAK (there are only two signal points, ACK or NAK) than in the case of multiple ACK/NAKs.
  • channel coding is used to encode all the ACK/NAKs that are to be transmitted at the same time.
  • a family of flexible channel codes can be used to encode the messages . The exact code to use depends on the number of ACK/NAK messages to be transmitted. Note that there is no need to additionally signal which code is adopted in the feedback channel since the sender knows how many ACK/NAKs shall be fed back. Consequently, the sender knows which of the code words the channel coder may generate. For example, as illustrated in figures 7a and 7b, only two different code words are possible if a single ACK/NAK is to be fed back.
  • the channel code is designed such that the minimum distance, d m i n , between the signal points is larger the smaller the number of simultaneous ACK/NAKs that are transmitted.
  • d min 64, for 2-7 ACK/NAKs, d min >32, and for 8-10 ACK/NAKs, d min >16.
  • the metric can serve a soft check on the reliability of the decoded results.

Landscapes

  • Engineering & Computer Science (AREA)
  • Computer Networks & Wireless Communication (AREA)
  • Signal Processing (AREA)
  • Mobile Radio Communication Systems (AREA)
  • Detection And Prevention Of Errors In Transmission (AREA)
  • Radio Transmission System (AREA)

Abstract

Procédés et configurations dans des systèmes cellulaires de communications mobiles, pour la transmission d'éléments d''information de rétroaction multiples en liaison avec des processus HARQ multiples. On transmet des messages de rétroaction multiples, par exemple accusés de réception positifs ou négatifs, en un seul instant, sans recourir à la définition de structures multiples pour la signalisation de rétroaction et de sorte que le lien entre un certain message de rétroaction et un certain processus ARQ hybride (et/ou flux MIMO) reste non ambigu.
PCT/SE2007/050022 2006-01-18 2007-01-16 Procédé et configuration dans un système de télécommunications WO2007084065A2 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
SE0600107-7 2006-01-18
SE0600107 2006-01-18

Publications (2)

Publication Number Publication Date
WO2007084065A2 true WO2007084065A2 (fr) 2007-07-26
WO2007084065A3 WO2007084065A3 (fr) 2007-09-20

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Cited By (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2009021889A2 (fr) * 2007-08-14 2009-02-19 Nokia Siemens Networks Oy Procédé et dispositif pour le traitement des données dans un réseau et système de communication comprenant ledit dispositif
WO2010015151A1 (fr) * 2008-08-07 2010-02-11 中兴通讯股份有限公司 Procédé de multiplexage d’informations
US8611265B2 (en) 2008-11-26 2013-12-17 Qualcomm Incorporated Methods and systems for performing HARQ ACK with scanning and sleep in WiMAX systems
GB2537017A (en) * 2016-02-05 2016-10-05 3G Wave Ltd Sequential ACK/NACK encoding
WO2019029173A1 (fr) * 2017-08-09 2019-02-14 Oppo广东移动通信有限公司 Procédé de détermination de longueur d'informations de réponse de rétroaction et produit associé

Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP1176761A2 (fr) * 2000-06-09 2002-01-30 Texas Instruments Incorporated Communication sans fil avec retransmission éfficace
US20040085934A1 (en) * 2002-11-01 2004-05-06 Krishna Balachandran Flexible transmission method for wireless communications
EP1565023A2 (fr) * 2004-02-14 2005-08-17 Samsung Electronics Co., Ltd. Procéde pour éffectuer HARQ en mode comprimé dans un système de communication mobile supportant paquets à haut débit (HSDPA)

Patent Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP1176761A2 (fr) * 2000-06-09 2002-01-30 Texas Instruments Incorporated Communication sans fil avec retransmission éfficace
US20040085934A1 (en) * 2002-11-01 2004-05-06 Krishna Balachandran Flexible transmission method for wireless communications
EP1565023A2 (fr) * 2004-02-14 2005-08-17 Samsung Electronics Co., Ltd. Procéde pour éffectuer HARQ en mode comprimé dans un système de communication mobile supportant paquets à haut débit (HSDPA)

Cited By (12)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2009021889A2 (fr) * 2007-08-14 2009-02-19 Nokia Siemens Networks Oy Procédé et dispositif pour le traitement des données dans un réseau et système de communication comprenant ledit dispositif
EP2028779A1 (fr) * 2007-08-14 2009-02-25 Nokia Siemens Networks Oy Procédé et dispositif de traitement ARQ hybride dans un réseau et système de communication comprenant un tel dispositif
WO2009021889A3 (fr) * 2007-08-14 2009-08-27 Nokia Siemens Networks Oy Procédé et dispositif pour le traitement des données dans un réseau et système de communication comprenant ledit dispositif
WO2010015151A1 (fr) * 2008-08-07 2010-02-11 中兴通讯股份有限公司 Procédé de multiplexage d’informations
US8537752B2 (en) 2008-08-07 2013-09-17 Zte Corporation Information multiplexing method
US8611265B2 (en) 2008-11-26 2013-12-17 Qualcomm Incorporated Methods and systems for performing HARQ ACK with scanning and sleep in WiMAX systems
GB2537017A (en) * 2016-02-05 2016-10-05 3G Wave Ltd Sequential ACK/NACK encoding
GB2537017B (en) * 2016-02-05 2020-06-03 3G Wave Ltd Sequential ACK/NACK encoding
WO2019029173A1 (fr) * 2017-08-09 2019-02-14 Oppo广东移动通信有限公司 Procédé de détermination de longueur d'informations de réponse de rétroaction et produit associé
US11115171B2 (en) 2017-08-09 2021-09-07 Guangdong Oppo Mobile Telecommunications Corp., Ltd. Method for determining length of feedback response information and related product
US11233621B2 (en) 2017-08-09 2022-01-25 Guangdong Oppo Mobile Telecommunications Corp., Ltd. Method for determining length of feedback response information and related product
US11855926B2 (en) 2017-08-09 2023-12-26 Guangdong Oppo Mobile Telecommunications Corp., Ltd. Method for determining total number of bits of feedback response information and related product

Also Published As

Publication number Publication date
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