WO2009133537A1 - Système et procédé pour la mise en œuvre d’un protocole de demande de répétition automatique hybride dans un système de communication sans fil à entrées et sorties multiples - Google Patents

Système et procédé pour la mise en œuvre d’un protocole de demande de répétition automatique hybride dans un système de communication sans fil à entrées et sorties multiples Download PDF

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Publication number
WO2009133537A1
WO2009133537A1 PCT/IB2009/051792 IB2009051792W WO2009133537A1 WO 2009133537 A1 WO2009133537 A1 WO 2009133537A1 IB 2009051792 W IB2009051792 W IB 2009051792W WO 2009133537 A1 WO2009133537 A1 WO 2009133537A1
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WO
WIPO (PCT)
Prior art keywords
data segment
processing
original data
symbols
processing pattern
Prior art date
Application number
PCT/IB2009/051792
Other languages
English (en)
Inventor
Ni Ma
Xiaobo Zhang
Gang Wu
Original Assignee
Nxp B.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 Nxp B.V. filed Critical Nxp B.V.
Publication of WO2009133537A1 publication Critical patent/WO2009133537A1/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
    • H04L1/18—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
    • H04L1/02—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
    • 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
    • H04L1/1874—Buffer management
    • 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
    • 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
    • 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
    • H04L1/0637—Properties of the code
    • H04L1/0668—Orthogonal systems, e.g. using Alamouti codes

Definitions

  • Embodiments of the invention relate generally to wireless communication systems and, more particularly, to techniques for implementing a hybrid automatic repeat request protocol in a multiple input multiple output wireless communication system.
  • ARQ Automatic Repeat Request Due to the potential for deteriorated channel characteristics in wireless communication systems,
  • FEC Forward Error Correction
  • 3GPP 3rd Generation Partnership Project
  • LTE Long Term Evolution
  • a multiple input multiple output (MIMO) wireless communication system utilizes at least one antenna in the transmitter and at least one antenna in the receiver and may achieve higher spectrum efficiency and link diversity.
  • a MIMO wireless communication system may use more than one antenna in the transmitter and more than one antenna in the receiver, or one antenna in the transmitter and more than one antenna in the receiver, or more than one antenna in the transmitter and one antenna in the receiver, or one antenna in the transmitter and one antenna in the receiver.
  • original data is processed into symbols and then buffered for retransmission. Because symbols contain complicated amplitude and phase data, buffering the symbols is a resource intensive operation. Embodiments of a system are described.
  • the system is a system to implement a hybrid automatic repeat request protocol in a multiple input multiple output wireless communication system.
  • the system includes a retransmission buffer and a processing unit.
  • the retransmission buffer buffers an original data segment.
  • the processing unit processes the original data segment into a plurality of symbols.
  • the buffered original data segment is transmitted to the processing unit for processing in response to an error signal that is generated from a remote receiver in response to receiver processing of the symbols.
  • Other embodiments of the system are also described.
  • Embodiments of a method are also described.
  • the method is a method for implementing a hybrid automatic repeat request protocol in a multiple input multiple output wireless communication system.
  • the method includes buffering an original data segment.
  • the method also includes processing the original data segment into a plurality of symbols.
  • the method also includes transmitting the buffered original data segment for processing in response to an error signal that is generated in response to receiver processing of the symbols.
  • Other embodiments of the method are also described.
  • the method is a method for implementing a hybrid automatic repeat request protocol in a multiple input multiple output wireless communication system.
  • the method includes encoding an original data segment for error correction.
  • the method also includes buffering the encoded data segment.
  • the method also includes processing the encoded data segment into a plurality of symbols, wherein the processing comprises modulating the encoded data segment into a plurality of symbols and coding the symbols for data communication in a multiple input multiple output wireless communication system.
  • the method also includes transmitting the buffered encoded data segment for processing into a new plurality of symbols in response to an error signal that is generated in response to receiver processing of the symbols.
  • Other embodiments of the method are also described.
  • Fig. 1 depicts a schematic block diagram of one embodiment of a multiple input multiple output wireless communication system.
  • Fig. 2 illustrates a schematic block diagram of a system to implement a hybrid automatic repeat request protocol in a multiple input multiple output wireless communication system.
  • Fig. 3 illustrates an example embodiment of the retransmission buffer of the transmitter of Fig. 2.
  • Fig. 4 illustrates a schematic flow chart diagram of one embodiment of a method for implementing a hybrid automatic repeat request protocol in a multiple input multiple output wireless communication system.
  • Fig. 1 depicts a schematic block diagram of one embodiment of a multiple input multiple output wireless communication system 100.
  • the multiple input multiple output wireless communication system 100 includes a base station 102, also referred to as an evolved Node B (eNB), and multiple mobile stations 104, also referred to as user equipments (UEs).
  • eNB evolved Node B
  • UEs user equipments
  • the eNB 102 also may be referred to generically as a transmitter and the UEs 104 may be referred to generically as the receivers.
  • the eNB also may be referred to generically as the receiver and the UEs may be referred to generically as the transmitters, depending on the direction of data communication within the wireless communication system.
  • the multiple input multiple output wireless communication system utilizes at least one antenna in the transmitter and at least one antenna in the receiver.
  • the multiple input multiple output wireless communication system may use more than one antenna in the transmitter and more than one antenna in the receiver, or one antenna in the transmitter and more than one antenna in the receiver, or more than one antenna in the transmitter and one antenna in the receiver, or one antenna in the transmitter and one antenna in the receiver.
  • the eNB 102 includes two antennas, although the eNB can include more than two antennas. In general, the eNB is responsible for coordinating communications between the eNB 102 and the UEs 104.
  • the UEs 104 are wireless communication mobile stations that support wireless operations as specified in the 3rd Generation Partnership Project (3 GPP) Long Term Evolution (LTE) system specification.
  • the UEs may have one or two antennas, although the UEs are not limited to two antennas (e.g., the UEs can include more than two antennas).
  • Other embodiments of the multiple input multiple output wireless communication system 100 may implement other wireless schemes such as the 3rd Generation Partnership Project (3GPP) Evolved High Speed Packet Access (HSPA+), WiMAX, IEEE 802.1 In, and other 3G standards or 4G standards.
  • Fig. 2 illustrates a schematic block diagram of a system 190 that is configured to implement a hybrid automatic repeat request protocol in a multiple input multiple output wireless communication system.
  • the system includes a transmitter 200 and a receiver 216.
  • the system includes several functional blocks described herein, other embodiments may include fewer or more functional blocks to implement more or less functionality.
  • the transmitter 200 includes a forward error correction data encoder 202, a retransmission buffer 204, a retransmission manager 206, a processing unit 208, and an antenna unit 214, and the receiver 216 includes an antenna unit 218 and a data processor 220.
  • the forward error correction data encoder 202 located along the signal path that is before the retransmission buffer 204 and the processing unit 208, is responsible for encoding original data segments for error correction.
  • the forward error correction data encoder utilizes, for example, block coding, convolutional coding, or both.
  • the retransmission buffer 204 is responsible for buffering the encoded data segments.
  • the retransmission buffer may be implemented in software, hardware, or a combination of software and hardware.
  • the retransmission buffer includes, for example, random access memory and disk drive.
  • the retransmission buffer buffers the encoded data segments in the same information storage format as the encoded data segments. For example, an eight bit original data segment is buffered as eight bits in the retransmission buffer.
  • the retransmission buffer buffers each encoded data segment in a plurality of blocks, according to a configuration in which the encoded data segment is organized for processing. An example of the retransmission buffer is described in more detail below with reference to Fig. 3.
  • the processing unit 208 is responsible for processing each of the encoded data segments into a plurality of symbols.
  • the processing unit includes a data converter module 210 to convert each of the encoded data segments into a plurality of symbols and a multiple input multiple output encoder module 212 to code the symbols into antenna-specific symbols.
  • the data converter module modulates each of the encoded data segments into a plurality of symbols and the multiple input multiple output encoder module spatially codes the symbols into antenna-specific symbols of a multiple input multiple output coding structure, such as Alamouti space time block code.
  • the processing unit may work according to one pattern, in which the output of the processing of the buffered encoded data segment is the same as the output of the processing of the encoded data segment.
  • the processing unit may work according to different patterns, in which the output of the processing of the buffered encoded data segment is the different from the output of the processing of the encoded data segment.
  • the pattern of the process unit includes the data conversion scheme of the data converter module and the coding scheme of the multiple input multiple output encoder module.
  • the retransmission manager 206 monitors for a Negative
  • the retransmission manager may be implemented in software, hardware, or a combination of software and hardware.
  • the antenna unit 214 includes at least one antenna and sends the symbols to the receiver 216.
  • the antenna unit 218 includes at least one antenna and receives the symbols from the transmitter 200 and forwards the symbols to the data processor 220.
  • the data processor processes the received data symbols and generates a Negative Acknowledgement (NACK) feedback signal 222 in response to an error that occurs in the processing of the symbols. For example, a NACK feedback signal is generated if the received data symbols fail a cyclic redundancy check.
  • an Acknowledgement (ACK) feedback signal is generated by the data processor and fed back to the transmitter. For example, a ACK feedback signal is generated if the received data symbols pass the cyclic redundancy check.
  • the data processor may be implemented in software, hardware, or a combination of software and hardware.
  • the forward error correction data encoder 202 encodes original data segments for error correction.
  • the retransmission buffer 204 buffers the encoded data segments.
  • the processing unit 208 converts each of the encoded data segments into a plurality of symbols and codes the symbols into antenna- specific symbols.
  • the retransmission manager 206 monitors for a Negative Acknowledgement (NACK) feedback signal 222 that is generated by the data processor 220 in response to a processing error of the symbols. If a NACK is detected, the retransmission manager triggers the retransmission of a buffered encoded data segment to the processing unit for processing.
  • the processing unit converts the buffered encoded data segment into a plurality of symbols and codes the symbols into antenna-specific symbols, which can then be transmitted, referred to generally as "retransmitted" to the receiver 216.
  • original data is processed into symbols and then buffered for retransmission.
  • the original data segments which are smaller than their corresponding symbols in terms of bits needed to represent the data, are buffered. Because symbols contain complicated amplitude and phase data, buffering the symbols is a resource intensive operation.
  • the number of symbols to be buffered may be smaller than the number of the corresponding original data segments to be buffered, the large size in terms of bits needed to represent the data of the symbols offset the number advantage of the symbols. Therefore, less memory is needed to buffer the original data segments than is needed to buffer the corresponding symbols.
  • Fig. 3 illustrates an example of the retransmission buffer 204 from Fig. 2.
  • the retransmission buffer buffers the encoded data segments in the same information storage format as the encoded data segments.
  • the retransmission buffer buffers each encoded data segment in a plurality of blocks, according to a configuration in which the encoded data segment is organized for processing.
  • the encoded data segment is buffered in the same form in which it is organized.
  • Fig. 3 depicts a retransmission buffer with two blocks labeled as B 1 and B2, with each block being four bits long.
  • the contents stored in block B 1 are the same as the contents of Dl and the contents stored in block B2 are the same as the contents of D2.
  • certain blocks of the retransmission buffer will be transmitted to the processing unit and individually processed into a new plurality of symbols.
  • the retransmission buffer may use fewer or more blocks.
  • Other embodiments of the retransmission buffer may use fewer or more portions.
  • four blocks and four portions may be used.
  • Other embodiments may use bigger or smaller blocks or portions.
  • two bits or eight bits may be used.
  • Fig. 4 depicts an example of a method for implementing a hybrid automatic repeat request protocol in a multiple input multiple output wireless communication system.
  • an original data segment is buffered and processed into a plurality of symbols.
  • decision point 404 it is determined whether an error signal is received in response to receiver processing of the symbols. If an error signal is not received, then the process returns to decision point 404.
  • the buffered original data segment is transmitted for processing.
  • Original data segments are buffered in the current scheme and modulated symbols are buffered in the exemplary conventional scheme.
  • the mathematical analysis makes assumptions as follows.
  • the size of a retransmitted symbol is the same as the size of an initial transmitted symbol. Buffering is in the scale of one codeword.
  • the length of each original codeword is D bits, a modulated symbol corresponds to M original bits, a modulated symbol occupies N bits, and generally, a modulated symbol occupies more than ten bits and a modulated symbol corresponds to less than six original bits.
  • the buffer requirement for the exemplary conventional scheme B Symbol in bits is given by:
  • Table 1 includes the five columns. From left to right, the first column is the original codeword length, the second column is the modulation order M, the third column is the modulated symbol size N, the fourth column is the buffer requirement of the exemplary conventional scheme in bits, and the fifth column is the buffer requirement of the current scheme in bits. Table 1 illustrates that the buffer requirement of the current scheme is smaller than the buffer requirement of the exemplary conventional scheme. As illustrated by this comparison, embodiments of the current scheme can effectively conserve memory resources.
  • Embodiments of the current scheme for implementing a hybrid automatic repeat request protocol can be applied to various MIMO wireless communication systems, including the 3rd Generation Partnership Project (3GPP) Long Term Evolution (LTE) system, the 3rd Generation Partnership Project (3GPP) Evolved High Speed Packet Access (HSPA+) system, WiMAX, IEEE 802.1 In, and other 3G systems or 4G systems.
  • 3GPP 3rd Generation Partnership Project
  • LTE Long Term Evolution
  • 3GPP 3rd Generation Partnership Project
  • HSPA+ High Speed Packet Access
  • WiMAX Wireless Fidelity
  • IEEE 802.1 In IEEE 802.1 In

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

Abstract

Système et procédé pour la mise en œuvre d’un protocole de demande de répétition automatique hybride dans un système de communication sans fil à entrées et sorties multiples. Ledit système comprend une mémoire tampon de retransmission et un processeur. Ladite mémoire tampon de retransmission mémorise un segment de données initial, et ledit processeur traite ce segment pour obtenir une pluralité de symboles. Le segment de données initial mis en mémoire tampon est transmis audit processeur en vue d’être traité, en réponse à un signal d’erreur généré à partir d’un récepteur distant, en réponse au traitement des symboles par ce récepteur.
PCT/IB2009/051792 2008-05-02 2009-05-01 Système et procédé pour la mise en œuvre d’un protocole de demande de répétition automatique hybride dans un système de communication sans fil à entrées et sorties multiples WO2009133537A1 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
US4983808P 2008-05-02 2008-05-02
US61/049,838 2008-05-02

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WO2009133537A1 true WO2009133537A1 (fr) 2009-11-05

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Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US20030156572A1 (en) * 2002-02-15 2003-08-21 Yan Hui Method and apparatus for providing transmit diversity with adaptive basis
EP1501210A1 (fr) * 2002-09-13 2005-01-26 Matsushita Electric Industrial Co., Ltd. Dispositif et procede de transmission radio
WO2007149049A1 (fr) * 2006-06-23 2007-12-27 Panasonic Corporation Retransmission de données dans un système à entrées multiples sorties multiples (mimo)

Patent Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US20030156572A1 (en) * 2002-02-15 2003-08-21 Yan Hui Method and apparatus for providing transmit diversity with adaptive basis
EP1501210A1 (fr) * 2002-09-13 2005-01-26 Matsushita Electric Industrial Co., Ltd. Dispositif et procede de transmission radio
WO2007149049A1 (fr) * 2006-06-23 2007-12-27 Panasonic Corporation Retransmission de données dans un système à entrées multiples sorties multiples (mimo)

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