WO2008125923A1 - Indication de procédés de retransmission dans des systèmes multifaisceaux - Google Patents

Indication de procédés de retransmission dans des systèmes multifaisceaux Download PDF

Info

Publication number
WO2008125923A1
WO2008125923A1 PCT/IB2007/053536 IB2007053536W WO2008125923A1 WO 2008125923 A1 WO2008125923 A1 WO 2008125923A1 IB 2007053536 W IB2007053536 W IB 2007053536W WO 2008125923 A1 WO2008125923 A1 WO 2008125923A1
Authority
WO
WIPO (PCT)
Prior art keywords
transmission
beams
retransmission
retransmission process
transmission beams
Prior art date
Application number
PCT/IB2007/053536
Other languages
English (en)
Inventor
Matthew P. J. Baker
Timothy J. Moulsley
Original Assignee
Koninklijke Philips Electronics N.V.
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 Koninklijke Philips Electronics N.V. filed Critical Koninklijke Philips Electronics N.V.
Priority to EP07826237A priority Critical patent/EP2057773A1/fr
Publication of WO2008125923A1 publication Critical patent/WO2008125923A1/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
    • H04L1/12—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
    • H04L1/1867—Arrangements specially adapted for the transmitter end
    • H04L1/1887—Scheduling and prioritising arrangements
    • 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
    • H04B7/0602—Diversity systems; Multi-antenna system, i.e. transmission or reception using multiple antennas using two or more spaced independent antennas at the transmitting station using antenna switching
    • H04B7/0608—Antenna selection according to transmission parameters
    • 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
    • H04B7/0613—Diversity systems; Multi-antenna system, i.e. transmission or reception using multiple antennas using two or more spaced independent antennas at the transmitting station using simultaneous transmission
    • H04B7/0615—Diversity systems; Multi-antenna system, i.e. transmission or reception using multiple antennas using two or more spaced independent antennas at the transmitting station using simultaneous transmission of weighted versions of same signal
    • H04B7/0617—Diversity systems; Multi-antenna system, i.e. transmission or reception using multiple antennas using two or more spaced independent antennas at the transmitting station using simultaneous transmission of weighted versions of same signal for beam forming
    • 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
    • H04B7/0613—Diversity systems; Multi-antenna system, i.e. transmission or reception using multiple antennas using two or more spaced independent antennas at the transmitting station using simultaneous transmission
    • H04B7/0667—Diversity systems; Multi-antenna system, i.e. transmission or reception using multiple antennas using two or more spaced independent antennas at the transmitting station using simultaneous transmission of delayed versions of same signal
    • H04B7/0671—Diversity systems; Multi-antenna system, i.e. transmission or reception using multiple antennas using two or more spaced independent antennas at the transmitting station using simultaneous transmission of delayed versions of same signal using different delays between antennas
    • 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
    • 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
    • H04L1/1867—Arrangements specially adapted for the transmitter end
    • H04L1/1893—Physical mapping 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
    • H04L1/02—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
    • H04L1/0625—Transmitter arrangements

Definitions

  • the present invention relates to a method, computer program product, system, transmitter device and receiver device for indicating a retransmission process in a multi-beam transmission system.
  • MIMO Multiple Input Multiple Output
  • MIMO systems use multiple inputs and multiple outputs from a single channel. These systems are defined by spatial diversity and spatial multiplexing. Spatial diversity is known as receiver (Rx) and transmitter (Tx) diversity. Signal copies are transferred from another antenna or received at more than one antenna. With spatial multiplexing the system is able to carry more than one spatial data stream over one frequency simultaneously.
  • MIMO was established in IEEE 802.1 In, 802.16-2004 and 802.16e as well as in 3 rd Generation Partnership Project (3GPP). Further standards which include MIMO are IEEE 802.20 and 802.22.
  • MIMO channels have multiple links and operate on the same frequency.
  • the challenge of this technology is separation and equalization of all the signal paths.
  • Spatial multiplexing can provide higher capacity but no better signal quality. Instead of improving signal quality, spatial multiplexing may decrease it. Spatial diversity improves the signal quality and achieves a higher signal-to-noise ratio at the receiver-side. Especially in extensive network areas, spatial multiplexing may be pushed to its limits. The larger the network environment is, the higher the signal strength has to be.
  • the available time, frequency and spatial diversity can be exploited using space-time codes, space-frequency codes or a combination thereof.
  • space-time block codes are known as a way of gaining diversity in systems with multiple antennas.
  • a block of symbols is transformed and transmitted from one antenna and the same data with a different transformation is transmitted from another antenna.
  • the concept can be generalized into the frequency domain as space- frequency block codes or can be extended to cover both time and frequency.
  • Alamouti scheme as described for example in S. M. Alamouti, "A simple transmitter diversity scheme for wireless communications", IEEE J. Select. Areas Commun., vol. 16, no. 8, pp. 1451-1458, Oct. 1998, and a single receiver antenna
  • the received SNR becomes ((hi) 2 + (Ii2) 2 )/n 2 . This means that (at least in principle) all the received power can be recovered.
  • Space-time codes additionally improve the performance and make spatial diversity useable.
  • the signal copy is not only transmitted from another antenna but also at another time. This delayed transmission is called delayed diversity.
  • Space-time codes combine spatial and temporal signal copies which are multiplexed in two data chains.
  • Fig. 3 shows a schematic block diagram of a conventional transmitter in a multi-beam transmission system.
  • four HARQ processes are supplied to a data packet selection unit 20 and selectively switched to two beamformers 32, 34.
  • data packets from any HARQ retransmission process can be selected for transmission on any beam and at any time.
  • UTRA Universal Mobile Telecommunications System Terrestrial Radio Access
  • WCDMA Wideband Code Division Multiple Access
  • FDD Frequency Division Duplex
  • D-TxAA Double Transmit Antenna Array
  • STTD Space-Time Transmit Diversity
  • D-TxAA is derived from an existing closed loop transmit diversity scheme (TxAA mode 1) where the mobile terminal signals to the network complex weights which should be applied to the signals from each of two transmit antennas.
  • TxAA mode 1 an existing closed loop transmit diversity scheme
  • two different data streams are transmitted using orthogonal weight vectors, one weight vector being based on those transmitted from the mobile terminal, and the other vector being derived deterministically from the first.
  • Orthogonal pilot channels are transmitted from each antenna of the respective base station device (i.e., Node B in UMTS terminology).
  • Feedback information (FBI) for the first beam is derived by the terminal device (i.e. user equipment (UE) in UMTS terminology) and transmitted to the base station device, indicating the desired beamforming vector.
  • UE user equipment
  • the first beam is transmitted using a restricted code book of weight vectors (for example the codebook currently used for TxAA mode 1).
  • the identity of the antenna weight vector for the first beam is signaled to the UE on the High-Speed Shared Control Channel (HS-SCCH).
  • HS-SCCH High-Speed Shared Control Channel
  • the second beam is transmitted using a deterministic phase vector which is orthonormal to the vector for the first beam.
  • Channel quality information is signaled by the terminal device to the base station device, enabling the base station device to derive a different rate for each of the two beams.
  • the transmissions on the two beams are comprised of separate codewords, each being protected by a dedicated cyclic redundancy code (CRC). This further implies that independent HARQ retransmission schemes (such as the hybrid automatic repeat request (HARQ) scheme) operate on the two beams.
  • CRC cyclic redundancy code
  • the decoding time available for the terminal device to decode a packet is unchanged from previous releases of UMTS HSDPA (High-Speed Downlink Packet Access). This implies that the constraint on the minimum number of retransmission processes in existence applies independently per beam for D-TxAA. In HSDPA, five parallel retransmission processes are needed (eight are actually provided) in order to ensure full channel utilization during the decoding time of the terminal device.
  • Full flexibility requires enough signaling bits to indicate the transmission of any of the retransmission processes or none on either of the beams. For example, for a total of N retransmission processes, where N is equal to the number of beams multiplied by the number of processes required on a single beam, full flexibility requires the ability to signal N+l values (one of N processes or none) for the first beam, and N values (one of N-I processes or none) for the second beam, i.e., a total of N(N+ 1) values. For five processes, this results in 110 values, requiring 7 signaling bits.
  • An object of the present invention is to provide transmission or signaling mechanism by means of which retransmission performance can be improved and signaling overhead for indicating the identity of retransmission processes transmitted on different beams can be reduced.
  • mapping and processing steps can be implemented by providing respective mapping and/or processing units at the transmitter device.
  • the detecting unit of the receiver device may be arranged to detect data packets associated with at least one of said retransmission processes, wherein the retransmission control unit if the receiver device may be arranged to request a retransmission based on the signaled combination and an incorrect reception of at least one of said data packets.
  • the invention may be implemented using concrete hardware units, or alternative as a computer program product, e.g., embodied on a computer-readable medium or downloadable from network system, comprising code means for generating the steps of the above method when run on a computer device, e.g., provided at a respective transmitter or receiver device.
  • a computer program product e.g., embodied on a computer-readable medium or downloadable from network system, comprising code means for generating the steps of the above method when run on a computer device, e.g., provided at a respective transmitter or receiver device.
  • Fig. 1 shows an exemplary packet transmission sequence according to a first embodiment
  • Fig. 2 shows an exemplary packet transmission sequence according to a second embodiment
  • Fig. 3 shows a schematic block diagram of a transmitter in a conventionalmulti-beam transmission system
  • Fig. 4 shows a schematic block diagram of a transmitter according to an embodiment.
  • ARQ Automatic retransmission request
  • ACK acknowledgement
  • CRC checksum
  • NAK negative acknowledgment
  • chase combining if the terminal device (i.e., UE) detects that a data packet has been received in error, it will send a NAK to the sending base station device (i.e., Node B). Rather than discarding the erroneous packet, it will be stored. In the event the retransmitted packet is also received in error, the previous packet and the current packet will be combined in a attempt to recover from the data errors. Each time a packet is resent, the same coding scheme is used. Eventually the packet will either be received without error and the terminal device will recover from the errors, or the maximum number of resends will be reached and error recovery will be left to higher protocol levels. IR is similar to chase combining. However, retransmitted data is coded using additional redundant information to improve the chances that the packet will be received either without errors or with enough errors removed to enable combing with previous packets to allow error correction.
  • reduced retransmission signaling overhead can be achieved by applying a predetermined relationship between HARQ process IDs and transmission beams.
  • each beam is allocated a predetermined subset of the available HARQ retransmission processes, for example mapping processes Pl and P2 to beam Bl and processes P3 and P4 to beam B2.
  • the proposed scheme leads to a total number of eight combinations, only a reduced number of three bits is required for the signaling.
  • the number of signaling bits required to indicate the HARQ process IDs to the terminal device is reduced from N 2 +N to (N/2) 2 +N.
  • the signal-to-interference-plus-noise ratio (SINR) of the first beam will be higher than the SINR of the second beam, as the first beam is formed using the optimally-derived and requested beamforming weight vector transmitted by the terminal device. Therefore, for sub-frames when no process is transmitted on beam Bl, the mapping of the other processes to the beams would be reversed, so that transmissions take place on beam Bl. This implies a modification to the signaling combinations, as shown for example below:
  • the proposed signaling scheme enables the number of signaling bits required to be reduced and/or the number of available processes to be increased.
  • the proposed signaling can support seven processes per beam with just six signaling bits, while the conventional method can only support five processes per beam with seven signaling bits.
  • a first exemplary sequence of packet transmissions on the two beams according to the first embodiment is shown in Fig. 1 , where the numerals denote the HARQ process ID and the letters denote the packet ID on a given process.
  • the packet A on HARQ process P3 is retransmitted three times.
  • the second retransmission which occurs in sub-frame No. 5, takes place on beam Bl, as no packets are then being transmitted on beam Bl.
  • the next retransmission in sub-frame No. 7, reverts to beam B2, as a packet is transmitted from HARQ process Pl on beam Bl.
  • the next packet on HARQ process P3, packet 3B is also able to be transmitted on beam Bl, as there are no packets from processes Pl or P2 requiring to be transmitted in sub- frame No. 9.
  • packets are transmitted on both beams in sub-frames when there is only a single codeword (HARQ process) available for transmission.
  • packet 3A in sub-frame No. 5 and packet 2C in sub-frame No. 8 are both transmitted on both beams simultaneously, as there is in each case only one HARQ process with data available for transmission.
  • This decorrelation transformation may be: scrambling interleaving - a space time block code (STBC), or a space frequency block code (SFBC), such as the well-known Alamouti scheme, otherwise known as STTD (Space-Time Transmit Diversity) in UMTS.
  • STBC space time block code
  • SFBC space frequency block code
  • the possibilities of using either selection of beam Bl or the decorrelated diversity mode can also be incorporated in the signaling scheme for indicating the HARQ process ID described above.
  • two signaling values can be provided to indicate that the packet is either transmitted on beam Bl or is transmitted using a predetermined decorrelated diversity mode such as STTD applied to the two beams.
  • the signaling values and numbers of bits required in this case are shown in the two following tables:
  • the number of signaling bits required then becomes (N/2) +2N, as shown in the table below.
  • Fig. 4 shows a schematic block diagram of a transmitter according to an embodiment for simultaneously transmitting information via two beams.
  • a mapping unit 10 is provided, which can handle four HARQ retransmission processes and which is adapted to define a predetermined mapping relationship between each retransmission process and each transmission beam.
  • a signaling unit 50 is provided for indicating the retransmission process by signaling a respective combination derived from the mapping relationship.
  • mapping unit 10 data from any HARQ retransmission process can be mapped to any beam generated by respective beamformers 32, 34 which control at least one of signal phases and signal amplitudes at respective antenna structures.
  • This mapping relationship can be predetermined, while a control unit 40 can be adapted to decide whether to use a different mapping, e.g., to map a concerned retransmission process to the strongest beam if there is no transmission on other transmission beams.
  • the control unit 40 may also control the selection of data packets to be transmitted on each beam. This can be achieved by a data packet selection unit 22 (e.g. with a multiplexing functionality) which is controlled by the control unit 40.
  • the signaling unit 50 may then indicate which HARQ retransmission processes are associated with transmitted data packets.
  • the multi-beam mode of transmission for a single packet can be used when the signal-to-noise ratio becomes too low for the system to support a satisfactory data rate on one or both beams independently.
  • this can be seen as a possible fallback mode for D-TxAA when the number of supportable layers drops.
  • the conventional assumption for the fallback mode of D-TxAA is closed- loop TxAA mode 1 , but this does not necessarily capture the maximum signal energy from all paths in the channel, as one beam would carry no signal.
  • a system operating in accordance with the invention might transmit a codeword of one retransmission process on two beams simultaneously using a space-time block code, while a codeword of a second retransmission process could be transmitted simultaneously on the third beam.
  • an efficient signaling mechanism has been described with a predetermined mapping relationship between retransmission processes and transmission beams, for indicating the identities of retransmission processes being transmitted on each beam.
  • Another aspect of the invention provides a mode of transmission with improved performance for frames in which only a single retransmission process has data available for transmission in a multi-beam transmission system, by making a suitable selection of the available beams, or using a decorrelated diversity mode (such as a space-time or space-frequency block code).
  • the present invention can be applied to any wireless communication multi-beam or multi-antenna system involving retransmission.
  • any kind of space-time coding, space-frequency coding or combined space-time-frequency coding could be used to explore the desired multi-site diversity effects.
  • the above embodiments may thus vary within the scope of the attached claims.

Landscapes

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

Abstract

La présente invention concerne un mécanisme de signalisation efficace avec une relation de mappage prédéterminée entre des procédés de retransmission et des faisceaux de transmission pour indiquer les identités des procédés de retransmission sur chaque faisceau. Selon un autre aspect, l'invention concerne un mode de transmission à performance améliorée pour des trames dans lesquelles un seul procédé de retransmission comprend des données disponibles pour la retransmission dans un système de transmission multifaisceaux, en faisant une sélection appropriée de faisceaux disponibles, ou en utilisant un mode diversité décorrélé (tel qu'un codage de bloc spatio-temporel ou spatio-fréquentiel).
PCT/IB2007/053536 2006-08-21 2007-09-03 Indication de procédés de retransmission dans des systèmes multifaisceaux WO2008125923A1 (fr)

Priority Applications (1)

Application Number Priority Date Filing Date Title
EP07826237A EP2057773A1 (fr) 2006-08-21 2007-09-03 Indication de procédés de retransmission dans des systèmes multifaisceaux

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
EP06119263 2006-08-21
EP06119263.9 2006-08-21

Publications (1)

Publication Number Publication Date
WO2008125923A1 true WO2008125923A1 (fr) 2008-10-23

Family

ID=39589108

Family Applications (1)

Application Number Title Priority Date Filing Date
PCT/IB2007/053536 WO2008125923A1 (fr) 2006-08-21 2007-09-03 Indication de procédés de retransmission dans des systèmes multifaisceaux

Country Status (3)

Country Link
EP (1) EP2057773A1 (fr)
RU (1) RU2009110149A (fr)
WO (1) WO2008125923A1 (fr)

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US9392616B2 (en) 2006-10-31 2016-07-12 Telefonaktiebolaget Lm Ericsson (Publ) HARQ in spatial multiplexing MIMO system
CN107896121A (zh) * 2016-09-29 2018-04-10 华为技术有限公司 一种信息传输方法、装置及系统
WO2019013444A1 (fr) * 2017-07-13 2019-01-17 삼성전자 주식회사 Procédé et appareil d'émission-réception combinée utilisant la diversité de faisceaux dans un système de communication sans fil

Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP1404048A1 (fr) * 2002-09-30 2004-03-31 Lucent Technologies Inc. Mécanismes de signalisation dans des schémas MIMO HARQ pour systèmes de communication sans fil
US20060107167A1 (en) * 2004-11-16 2006-05-18 Samsung Electronics Co., Ltd. Multiple antenna communication system using automatic repeat request error correction scheme
EP1788742A1 (fr) * 2004-09-13 2007-05-23 Matsushita Electric Industrial Co., Ltd. Système automatique de commande de requête de re-transmission et méthode de re-transmission pour système mimo-ofdm
EP1819088A2 (fr) * 2006-02-09 2007-08-15 Samsung Electronics Co., Ltd. Procédé et système de planification d'utilisateurs dans un système MIMO en fonction d'un nombre d'antennes déterminés par le récepteur

Patent Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP1404048A1 (fr) * 2002-09-30 2004-03-31 Lucent Technologies Inc. Mécanismes de signalisation dans des schémas MIMO HARQ pour systèmes de communication sans fil
EP1788742A1 (fr) * 2004-09-13 2007-05-23 Matsushita Electric Industrial Co., Ltd. Système automatique de commande de requête de re-transmission et méthode de re-transmission pour système mimo-ofdm
US20060107167A1 (en) * 2004-11-16 2006-05-18 Samsung Electronics Co., Ltd. Multiple antenna communication system using automatic repeat request error correction scheme
EP1819088A2 (fr) * 2006-02-09 2007-08-15 Samsung Electronics Co., Ltd. Procédé et système de planification d'utilisateurs dans un système MIMO en fonction d'un nombre d'antennes déterminés par le récepteur

Cited By (10)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US9392616B2 (en) 2006-10-31 2016-07-12 Telefonaktiebolaget Lm Ericsson (Publ) HARQ in spatial multiplexing MIMO system
US9866353B2 (en) 2006-10-31 2018-01-09 Telefonaktiebolaget Lm Ericsson (Publ) HARQ in spatial multiplexing MIMO system
US10326563B2 (en) 2006-10-31 2019-06-18 Telefonaktiebolaget Lm Ericsson (Publ) HARQ in spatial multiplexing MIMO system
US11101942B2 (en) 2006-10-31 2021-08-24 Telefonaktiebolaget Lm Ericsson (Publ) HARQ in spatial multiplexing MIMO system
US11777670B2 (en) 2006-10-31 2023-10-03 Telefonaktiebolaget Lm Ericsson (Publ) HARQ in spatial multiplexing MIMO system
CN107896121A (zh) * 2016-09-29 2018-04-10 华为技术有限公司 一种信息传输方法、装置及系统
WO2019013444A1 (fr) * 2017-07-13 2019-01-17 삼성전자 주식회사 Procédé et appareil d'émission-réception combinée utilisant la diversité de faisceaux dans un système de communication sans fil
CN110832785A (zh) * 2017-07-13 2020-02-21 三星电子株式会社 在无线通信系统中应用波束分集的收发方法和装置
CN110832785B (zh) * 2017-07-13 2022-08-09 三星电子株式会社 在无线通信系统中应用波束分集的收发方法和装置
US11451267B2 (en) 2017-07-13 2022-09-20 Samsung Electronics Co., Ltd. Transreceiving method and apparatus applying beam diversity in wireless communication system

Also Published As

Publication number Publication date
RU2009110149A (ru) 2010-09-27
EP2057773A1 (fr) 2009-05-13

Similar Documents

Publication Publication Date Title
US10348613B2 (en) Primary and secondary stations in radio communication system
KR100926400B1 (ko) 무선 통신 방법 및 무선 통신 시스템 및 수신 장치 및 송신장치
KR101270986B1 (ko) 무선통신장치 및 무선통신방법
JP4464836B2 (ja) マルチアンテナ通信装置の通信方法及びマルチアンテナ通信装置
JP4068625B2 (ja) 通信のシステム、方法及びデバイス
US8023524B2 (en) Cooperative relay system enabling simultaneous broadcast-unicast operation with efficient automatic repeat request functionality
EP2013985B1 (fr) Appareil et procédé de commutation entre une fonction mimo mono-utilisateur et multi-utilisateurs dans un réseau sans fil
CN104022853B (zh) 无线通信设备及其重发修改方法
KR101449890B1 (ko) 무선 통신 시스템 및 무선 통신 방법
CN101107803B (zh) 发送装置和发送方法
WO2009088167A1 (fr) Procédé de retransmission de signaux dans un système mimo employant un schéma harq
EP1792461A1 (fr) Procede et appareil d'equilibrage maximum du debit d'informations en fonction de la qualite de service, dans un systeme mimo
WO2009052233A1 (fr) Retransmission de demande de répétition automatique hybride à multiples entrées multiples sorties à mise en forme de faisceau
WO2008018468A1 (fr) appareil de transmission radio multi-antenne et procédé de transmission radio multi-antenne
JPWO2008142733A1 (ja) データ再送方法及び，これを適用する無線通信システム
JP4105917B2 (ja) 無線送信装置及び無線送信方法
WO2008125923A1 (fr) Indication de procédés de retransmission dans des systèmes multifaisceaux
KR101253175B1 (ko) 적응적 맵퍼를 이용한 복합 자동 재전송 방법 및 이를이용한 송신기
JP5223915B2 (ja) 移動通信システム及びその通信方法並びに送信局
KR20060074284A (ko) 다수의 안테나를 이용한 통신 시스템에서 패킷 재전송 방법
JP2008187707A (ja) 移動通信システム及びその通信方法並びに送信局
Yu et al. Hybrid ARQ scheme for space-time coded MIMO systems
CN101399639A (zh) Mimo空间复用系统中harq的方法和装置

Legal Events

Date Code Title Description
121 Ep: the epo has been informed by wipo that ep was designated in this application

Ref document number: 07826237

Country of ref document: EP

Kind code of ref document: A1

WWE Wipo information: entry into national phase

Ref document number: 2007826237

Country of ref document: EP

NENP Non-entry into the national phase

Ref country code: DE

ENP Entry into the national phase

Ref document number: 2009110149

Country of ref document: RU

Kind code of ref document: A