WO2008069574A1 - Appareil et procédé d'émission et de réception d'un signal d'accusé de réception dans un système de communication mobile - Google Patents

Appareil et procédé d'émission et de réception d'un signal d'accusé de réception dans un système de communication mobile Download PDF

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Publication number
WO2008069574A1
WO2008069574A1 PCT/KR2007/006285 KR2007006285W WO2008069574A1 WO 2008069574 A1 WO2008069574 A1 WO 2008069574A1 KR 2007006285 W KR2007006285 W KR 2007006285W WO 2008069574 A1 WO2008069574 A1 WO 2008069574A1
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WIPO (PCT)
Prior art keywords
signal
reception
success
acknowledgment signal
failure
Prior art date
Application number
PCT/KR2007/006285
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English (en)
Inventor
Heesoo Lee
Hyun-Kyu Chung
Original Assignee
Electronics And Telecommunications Research Institute
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
Priority claimed from KR1020070118517A external-priority patent/KR100953567B1/ko
Application filed by Electronics And Telecommunications Research Institute filed Critical Electronics And Telecommunications Research Institute
Priority to US12/517,968 priority Critical patent/US8149769B2/en
Publication of WO2008069574A1 publication Critical patent/WO2008069574A1/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
    • H04L1/20—Arrangements for detecting or preventing errors in the information received using signal quality detector

Definitions

  • the present invention relates to an apparatus and method of transmitting and receiving a reception acknowledgment (ACK) signal in a mobile communication system, and more particularly, to an apparatus and method of transmitting and receiving a reception acknowledgment signal having improved performance of receiving by using non-uniformity between an ACK signal and a negative ACK (NACK) signal.
  • ACK reception acknowledgment
  • NACK negative ACK
  • a wireless channel in a mobile communication system has very low reliability due to effects such as fading.
  • data transmitted via such a wireless channel may not be decoded successfully at a receiving end.
  • the receiving end should inform a transmitting end whether the decoding is successful so that transmitted data can be re-transmitted when necessary.
  • a channel for informing whether the reception is successful is called an ACK/NACK channel.
  • a reception success signal informing when the reception is successful at a receiving end is an ACK signal and a reception failure signal informing when reception has failed is called a NACK signal.
  • ACK/NACK information is generally 1 bit information.
  • the ACK/NACK signal is transmitted separately, the ACK/NACK signal is transmitted by performing B inary Phase Shift Keying (BPSK) modulation.
  • BPSK B inary Phase Shift Keying
  • a signal of 1 is transmitted for the ACK signal, and a signal of - 1 is transmitted for the NACK signal, a signal of
  • V? is transmitted for the ACK signal and a signal of
  • a reception signal of a receiving end y is as given by Equation 1. [5] L Equation 1 J
  • AWGN Additive White Gaussian Noise
  • the ACK/NACK signal may be transmitted with a very low error rate.
  • a data transmission rate differs according to the quality of a wireless channel.
  • adaptive modulation and coding is mainly used.
  • a required packet error rate should be considered.
  • a required transmission delay and required packet error rate are generally different according to types of data service.
  • a packet scheduler considers a quality of a wireless channel and transmits data at the highest data transmission rate from among data transmission rates that provide a lower error rate than the required packet error rate.
  • Such a required packet error rate is generally much lower than 0.5.
  • the frequency of transmitting an ACK signal is greater than that of an NACK signal.
  • the present invention provides an apparatus and method of transmitting and receiving which can increase the probability of correctly receiving an ACK/NACK signal in a wireless communication system by using a wide difference between the transmission frequency of the ACK signal and the transmission frequency of the NACK signal, that is, a non-uniformity between the ACK signal and the NACK signal.
  • FIG. 1 is a block diagram of an apparatus for receiving a reception acknowledgment signal according to a first embodiment of the present invention
  • FIG. 2 is a flowchart of a method of receiving a reception acknowledgment signal according to the first embodiment of the present invention
  • FIG. 3 is a flowchart of transmitting and receiving a reception acknowledgment signal in a mobile communication system according to the first embodiment of the present invention
  • FIG. 4 is a block diagram of an apparatus for transmitting a reception acknowledgment signal according to a second embodiment of the present invention.
  • FIG. 5 is a flowchart of a method of transmitting a reception acknowledgment signal according to the second embodiment of the present invention.
  • FIG. 6 is a block diagram of an apparatus for receiving a reception acknowledgment signal which corresponds to the apparatus for transmitting a reception acknowledgment signal according to the second embodiment of the present invention
  • FIG. 7 is a flowchart of an method for receiving a reception acknowledgment signal which corresponds to the method for transmitting a reception acknowledgment signal according to the second embodiment of the present invention
  • FIG. 8 is a block diagram of an apparatus for transmitting a reception acknowledgment signal according to a third embodiment of the present invention.
  • FIG. 9 is a flowchart of a method of transmitting a reception acknowledgment signal according to the third embodiment of the present invention.
  • FIG. 10 is a table illustrating variable length codes in which Huffman coding is applied according to the third embodiment of the present invention.
  • FIG. 11 is a flowchart of a method of transmitting and receiving in a mobile communication system in which a number of apparatuses for a receiving reception acknowledgment signal and one apparatus for transmitting a reception acknowledgment signal exist according to the third embodiment of the present invention. Best Mode
  • a method of receiving a reception acknowledgment signal including: (a) receiving a reception acknowledgment signal indicating success or failure of receiving transmitted packet data correctly; (b) respectively calculating a probability that the reception acknowledgment signal is a reception success signal indicating the success of receiving the packet data correctly and a probability that the reception acknowledgment signal is a reception failure signal indicating the failure of receiving the packet data correctly, by using an estimated packet error rate predicted with respect to the success or failure of receiving the packet data correctly, based on a pre-set required packet error rate; and (c) determining whether the reception acknowledgment signal is the reception success signal or the reception failure signal based on the respectively calculated probabilities.
  • a method of transmitting a reception acknowledgment signal including: respectively determining transmission powers of a reception success signal indicating a success of receiving a packet data correctly and a reception failure signal indicating a failure of receiving a packet data correctly in order to maximize a difference between a first complex signal and a second complex signal, the first complex signal being modulated for the reception success and the second complex signal being modulated for the reception failure, based on an average transmission power and a pre-set required packet error rate; and transmitting the reception success signal and the reception failure signal according to the respectively determined transmission powers of the reception success signal and the reception failure signal.
  • an apparatus for receiving a reception acknowledgment signal including: a reception acknowledgment signal receiving unit receives a reception acknowledgment signal indicating success or failure of receiving transmitted packet data correctly; a transmission power estimating unit respectively estimates transmission powers of a reception success signal indicating a success of receiving the packet data correctly and a reception failure signal indicating a failure of receiving the packet data correctly in order to maximize a difference between a first complex and a second complex signal, the first complex signal being modulated for the reception success of the packet data and the second complex signal being modulated for the reception failure of the packet data, based on the average transmission power and the required packet error rate set to be the same with the apparatus for transmitting a reception acknowledgment signal ; a reception success probability calculating unit respectively calculates the probability that the reception acknowledgment signal is the reception success signal and the probability that the reception acknowledgment signal is the reception failure signal, by using an estimated packet error rate predicted with respect to success or failure of receiving the packet data correctly, based on the transmission powers of the reception success signal and
  • a method of receiving a reception acknowledgment signal including: (a) receiving a reception acknowledgment signal indicating success or failure of receiving transmitted packet data correctly; (b) respectively estimating transmission powers of a reception success signal indicating a success of receiving the packet data correctly and a reception failure signal indicating a failure of receiving the packet data correctly in order to maximize a difference between a first complex and a second complex signal, the first complex signal being modulated for the reception success of the packet data and the second complex signal being modulated for the reception failure of the packet data, based on the average transmission power and the required packet error rate set to be the same with the apparatus for transmitting a reception acknowledgment signal ; (c) respectively calculating the probability that the reception acknowledgment signal is the reception success signal and the probability that the reception acknowledgment signal is the reception failure signal, by using an estimated packet error rate predicted with respect to success or failure of receiving the packet data correctly, based on the transmission powers of the reception success signal and the reception failure signal respectively estimated, and the required packet error rate
  • reception acknowledgment signals including: generating a single packet indicating reception successes or failures for a plurality of received data packets by using variable length coding based on a pre-set required packet error rate; and transmitting the generated single packet.
  • functions of various devices illustrated in the drawings including functional blocks which are indicated by a processor or a similar concept thereof can be provided by an embodiment entirely comprising hardware and hardware having a capability of executing appropriate software.
  • the functions can be provided by a single process, a single common processor, or a plurality of separate processors and a part among these elements can be shared.
  • the terms illustrated as concepts of a processor, control, or similar concepts thereof cannot be interpreted by exclusively referring to hardware having a capability of executing software and are intended to include Digital Signal Processors (DSP), Read-Only-Memory (ROM) and Random- Access-Memory (RAM) for storing hardware and software, and non-volatile memory without restriction. Other well-known types of hardware can also be included.
  • DSP Digital Signal Processors
  • ROM Read-Only-Memory
  • RAM Random- Access-Memory
  • FIG. 1 is a block diagram of an apparatus for receiving a reception acknowledgment signal according to a first embodiment of the present invention
  • FIG. 2 is a flowchart of a method of receiving a reception acknowledgment signal according to the first embodiment of the present invention.
  • the apparatus for receiving a reception acknowledgment signal includes a reception acknowledgment signal receiving unit 110, a reception success probability calculating unit 120, and a reception acknowledgment signal determining unit 130.
  • the reception acknowledgment signal receiving unit 110 receives a reception acknowledgment signal ACK/NACK which indicates success or failure of receiving transmitted packet data correctly, in operation 210.
  • the reception success probability calculating unit 120 respectively calculates the probability that the reception acknowledgment signal received in the reception acknowledgment signal receiving unit 110 is an ACK signal indicating the success of receiving packet data correctly and the probability that the reception acknowledgment signal received in the reception acknowledgment signal receiving unit 110 is an NACK signal indicating the failure of receiving packet data correctly, by using an estimated packet error rate predicted with respect to the success or failure of receiving transmitted packet data correctly, in operation 220.
  • the reception success probability calculating unit 120 includes a prior probability calculating unit (not shown) and a posterior probability calculating unit (not shown).
  • the prior probability calculating unit respectively calculates a prior probability that the reception acknowledgment signal is transmitted as the reception success signal and a prior probability that the reception acknowledgment signal is transmitted as the reception failure signal from an apparatus for transmitting a reception acknowledgment signal , by using the estimated packet error rate predicted according to the pre-set required packet error rate.
  • a signal of 1 is transmitted for the ACK signal, and a signal of - 1 is transmitted for the NACK signal, an
  • AWGN Additive White Gaussian Noise
  • the probability that the transmitting signal S is the ACK signal is P and the probability that the transmitting signal S is the NACK signal is ⁇ - p
  • Equation 4 a prior probability distribution of the transmitting signal S is as given by Equation 4. [51] [ Equation 4 ]
  • the posterior probability calculating unit respectively calculates a posterior probability that the received reception acknowledgment signal is the reception success signal and a posterior probability that the received reception acknowledgment signal is the reception failure signal, by using a transmission power of the reception acknowledgment signal, the prior probability that the reception acknowledgment signal is transmitted as the reception success signal, the prior probability that the reception acknowledgment signal is transmitted as the reception failure signal, and the probability distribution of the signal y extracted from the received reception acknowledgment signal.
  • the signal y extracted from the reception signal is
  • g is only a parameter for a sigma operation and does not have a special physical meaning.
  • the reception acknowledgment signal determining unit 130 determines whether the reception acknowledgment signal is the ACK signal or the NACK signal based on the probabilities of the ACK signal and the NACK signal respectively calculated in the reception success probability calculating unit 120, in operation 230.
  • the reception acknowledgment signal determining unit 130 determines the reception acknowledgment signal as the ACK signal and the NACK signal, respectively, when the posterior probability
  • FIG. 3 is a flowchart of transmitting and receiving a reception acknowledgment signal in a mobile communication system according to the first embodiment of the present invention.
  • the apparatus for receiving a reception acknowledgment signal determines a transmission rate and transmission power of packet data according to a previously analyzed quality of a wireless channel and a previously set required packet error rate, in operation 301.
  • Parameters indicating a state of the wireless channel include a Signal-to-Noise Ratio
  • SNR Signal to Interference Noise Ratio
  • MIMO Multi Input Multi Output
  • the apparatus for transmitting packet data transmits predetermined reference signals
  • the apparatus for receiving packet data which receives the predetermined reference signals analyzes a channel quality and transmits the quality of the wireless channel obtained as a result of the analysis to the apparatus for transmitting packet data. Therefore, the quality of the wireless channel can be obtained at the apparatus for transmitting packet data.
  • the apparatus for transmitting packet data can determine the quality of the wireless channel.
  • the apparatus for transmitting packet data which performs adaptive transmission selects and transmits the optimum transmission method based on the quality of the wireless channel obtained by the apparatus for transmitting packet data.
  • the quality of the wireless channel can be determined from information feedback from the apparatus for receiving packet data as in the FDD system or can be obtained by the apparatus for transmitting packet data itself as in the TDD system.
  • the present invention can be applied to all cases regardless of specific types of duplexing methods.
  • apparatus for transmitting packet data calculates the estimated packet error rate in consideration of the transmission rate and transmission power of packet data and the quality of the wireless channel determined in operation 301.
  • the estimated packet error rate can be determined from a function of the transmission rate of transmitted data, a state of a wireless channel, and transmission power. In general, if the transmission power is great or the state of a wireless channel is excellent, the packet error rate may be lowered. In addition, the greater the transmission rate of transmitted data, the higher the packet error rate.
  • apparatus for transmitting packet data transmits packet data according to the transmission rate and transmission power of packet data determined in operation 301.
  • the apparatus for transmitting a reception acknowledgment signal receives packet data transmitted in operation 303 and decodes the packet data in operation 304.
  • the apparatus for transmitting a reception acknowledgment signal modulates the reception acknowledgment signal (ACK signal or NACK signal) according to the success or failure of decoding in operation 304 and transmits the modulated signal in operation 305.
  • apparatus for transmitting packet data receives and interprets the reception acknowledgment signal transmitted in operation 304 by using the estimated packet error rate calculated in operation 302.
  • a process of interpreting a reception acknowledgment signal is described in detail with reference to FIGS. 1 and 2.
  • FIG. 4 is a block diagram of an apparatus for transmitting a reception acknowledgment signal according to a second embodiment of the present invention
  • FIG. 5 is a flowchart of a method of transmitting a reception acknowledgment signal performed in the apparatus for transmitting a reception acknowledgment signal of FIG. 4.
  • transmission power is set to be the same when transmitting the ACK signal and the NACK signal, whereas transmission power in the current embodiment is different when transmitting the ACK signal and the NACK signal by considering a transmission frequency of the ACK signal and the NACK signal.
  • a success rate of receiving a reception acknowledgment signal correctly increases in the current embodiment.
  • the apparatus for transmitting a reception acknowledgment signal includes a transmission power determining unit 410 and a reception acknowledgment signal transmitting unit 420.
  • the transmission power determining unit 410 respectively determines transmission powers of the ACK signal and the NACK signal in order to maximize the difference (distance) between a first complex signal and a second complex signal, the first complex signal being modulated for the ACK signal indicating the reception success and the second complex signal being modulated for the NACK signal indicating the reception failure, based on the average transmission power and the pre-set required packet error rate, in operation 510.
  • the transmitting signal when transmitting ACK information by a BPSK modulated signal is
  • PDF probability density function
  • Equation 9 which finds solutions to make the difference between the first complex signal and the second complex signal be at a maximum.
  • the reception acknowledgment signal transmitting unit 420 transmits the ACK signal and the NACK signal according to the transmission power of the ACK signal
  • the required packet error rate that is previously agreed to share the required packet error rate is stored in a database by each traffic type of packet data or a signal is exchanged so as to set the required packet error rate immediately after connecting with the apparatus for receiving a reception acknowledgment signal while commencing a service for transmitting and receiving packet data, so that the required packet error rate can be set to be the same with the receiving side of a reception acknowledgment signal.
  • FIG. 6 is a block diagram of an apparatus for receiving a reception acknowledgment signal which corresponds to the apparatus for transmitting a reception acknowledgment signal according to the second embodiment of the present invention
  • FIG. 7 is a flowchart of a method of receiving a reception acknowledgment signal performed in the apparatus for receiving a reception acknowledgment signal of FIG. 4.
  • the apparatus for receiving a reception acknowledgment signal includes a reception acknowledgment signal receiving unit 610, a transmission power estimating unit 620, a reception success probability calculating unit 630, and a reception acknowledgment signal determining unit 640.
  • the reception acknowledgment signal receiving unit 610 receives a reception acknowledgment signal indicating success or failure of receiving transmitted packet data correctly, in operation 710.
  • the transmission power estimating unit 620 respectively estimates transmission powers of a reception success signal and a reception failure signal in order to maximize the difference (distance) between a first complex and a second complex signal, the first complex signal being modulated for the reception success signal of the packet data and the second complex signal being modulated for the reception failure signal of the packet data, based on the average transmission power and the required packet error rate set to be the same with the apparatus for transmitting a reception acknowledgment signal .
  • the required packet error rate should be set to be the same with the transmitting side of a reception acknowledgment signal.
  • the method of respectively estimating the transmission powers of the reception success signal and the reception failure signal in the transmission power estimating unit 620 is same with the method of respectively determining the transmission powers of the reception success signal and the reception failure signal in the transmission power determining unit 410 of the apparatus for transmitting a reception acknowledgment signal illustrated in FIG. 4.
  • the reception success probability calculating unit 630 respectively calculates the probability that the received reception acknowledgment signal is the reception success signal and the probability that the received reception acknowledgment signal is the reception failure signal, by using the estimated packet error rate predicted with respect to success or failure of receiving the packet data correctly, according to the transmission powers of the reception success signal and the reception failure signal respectively estimated from the transmission power estimating unit 620, and the required packet error rate.
  • the reception success probability calculating unit 630 respectively calculates a posterior probability that the received reception acknowledgment signal is the reception success signal and a posterior probability that the received reception acknowledgment signal is the reception failure signal, by using the transmission powers of the reception success signal and the reception failure signal respectively estimated by the transmission power estimating unit 620, and a probability distribution of the signal extracted from the received reception acknowledgment signal.
  • the apparatus for receiving a reception acknowledgment signal respectively calculates the posterior probability that the received reception acknowledgment signal is the reception success signal and the posterior probability that the received reception acknowledgment signal is the reception failure signal, by using a posterior probability distribution of S as in the apparatus for receiving a reception acknowledgment signal illustrated in FIG. 1. This is illustrated in Equation 10.
  • the reception acknowledgment signal determining unit 640 determines whether the received reception acknowledgment signal is the reception success signal or the reception failure signal based on the probabilities respectively calculated by the reception success probability calculating unit 630. In other words, the reception acknowledgment signal determining unit 640 can identify whether the received reception acknowledgment signal is the ACK signal or the NACK signal by using the method of the maximum likelihood as given by Equation 11.
  • FIG. 8 is a block diagram of an apparatus for transmitting a reception acknowledgment signal according to a third embodiment of the present invention
  • FIG. 9 is a flowchart of a method of transmitting a reception acknowledgment signal performed in the apparatus for transmitting a reception acknowledgment signal of FIG. 8.
  • the apparatus and method of transmitting and receiving a reception acknowledgment signal in which the asymmetry in the frequency of generating the ACK/NACK signal is considered when one piece of ACK or NACK information is transmitted, are illustrated.
  • an apparatus and method of transmitting a reception acknowledgment signal in which the asymmetry in the frequency of generating the ACK/NACK signal is considered when a plurality of ACK or NACK information is transmitted within one packet, are illustrated.
  • the apparatus for transmitting a reception acknowledgment signal includes a single packet generating unit 810 and a single packet transmitting unit 820.
  • the single packet generating unit 810 generates a single packet indicating reception successes or failures for a plurality of received data packets by using variable length coding based on a pre-set required packet error rate, in operation 910.
  • the apparatus for transmitting a reception acknowledgment signal (apparatus for receiving data packet) receives N data packets and generates N pieces of ACK/NACK information, information of N bits is transmitted.
  • Variable length coding is a coding method which reduces the average number of coded bits by allocating a short code to information having a high frequency and a long code to information having a low frequency.
  • Huffman code is a typical example of variable length coding.
  • Huffman coding is used as a variable length coding method, in order to reduce the average number of coded bits used to transmit ACK/NACK information, compared with the conventional art in which the non-uniformity of ACK/NACK information is not considered and the same size of codes are allocated to all information. As such, in order to represent N pieces of ACK/NACK information,
  • Equation 12 The number of alphabets that have n pieces of ACK signals and N- n pieces of NACK signals is given by Equation 12. [112] [ Equation 12 ]
  • the average number of bits sent when transmitting by using a Huffman code is 1.059998 and is smaller that that of the conventional art which is 3 bits.
  • the probability of generating ACK is increased to 0.1, the average number of bits transmitted is slightly increased to 1.598. However, it is still reduced to half of the number of bits transmitted on the average, compared with that of the conventional art.
  • the single packet transmitting unit 820 transmits the single packet generated from the single packet generating unit 810 by using Huffman coding as described above in operation 920.
  • FIG. 11 is a flowchart of a method of transmitting and receiving in a mobile communication system in which a number of apparatuses for receiving a reception acknowledgment signal (apparatus for transmitting packet data) and one apparatus for transmitting a reception acknowledgment signal (apparatus for receiving packet data) exist according to the third embodiment of the present invention.
  • a number of the apparatuses for receiving a reception acknowledgment signal determine the transmission rate and the transmission power of packet data so as to satisfy the required packet error rate ⁇ according to a state of the wireless channel in operation 1101.
  • a number of apparatuses for receiving a reception acknowledgment signal (apparatus for transmitting packet data) transmit packet data using the transmission rate and the transmission power of packet data determined in operation 1101
  • the one apparatus for transmitting a reception acknowledgment signal receives packet data transmitted from a number of apparatuses for receiving a reception acknowledgment signal in operation 1002 and decodes the packet data in operation 1103.
  • the apparatus for transmitting a reception acknowledgment signal groups a number of reception acknowledgment signals (ACK/NACK) into one codeword packet by using variable length coding based on the required packet error rate ⁇ according to the successes or failures of decoding packet data in operation 1103 and modulates the codeword packet so as to transmit the codeword packet to the number of apparatuses for receiving a reception acknowledgment signal (apparatus for transmitting packet data) in operation 1004.
  • ACK/NACK reception acknowledgment signals
  • variable length coding in operation 1104 is illustrated in detail with reference to FIGS. 8 through 10.
  • a number of apparatuses for receiving a reception acknowledgment signal receives one codeword packet including a number of reception acknowledgment signals and decodes the codeword packet, thereby identifying reception success of the data packet transmitted by itself in operation 1105.
  • the probability of correctly interpreting the ACK/ NACK signal can be significantly increased and the success rate of receiving ACK/ NACK information correctly in a wireless communication system can also be increased.
  • the received reception acknowledgment signal is interpreted by using the non-uniformity of the frequency of generating the ACK/NACK signal, that is, advanced information, so that the performance of the apparatus and method can be increased.
  • the transmission power of the ACK signal and the NACK signal differ by using the non- uniformity of the frequency of generating the ACK/NACK signal in the apparatus for transmitting a reception acknowledgment signal so that the probability of correctly interpreting the ACK/NACK signal can be increased in the apparatus for receiving a reception acknowledgment signal.
  • a number of reception acknowledgment signals are transmitted as a single packet by using variable length coding based on the non-uniformity of the frequency of generating the ACK/NACK signal so that the reception acknowledgment signal can be transmitted with a small average number of bits.
  • the invention can also be embodied as computer readable codes on a computer readable recording medium.
  • the computer readable recording medium is any data storage device that can store data which can be thereafter read by a computer system. Examples of the computer readable recording medium include read-only memory (ROM), random-access memory (RAM), CD-ROMs, magnetic tapes, hard disks, floppy disks, flash memory, optical data storage devices, and carrier waves (such as data transmission through the Internet).
  • the computer readable recording medium can also be distributed over network coupled computer systems so that the computer readable code is stored and executed in a distributed fashion.
  • a font ROM data structure according to the present invention be embodied as computer readable codes on a computer readable recording medium such as ROM, RAM, CD-ROM, magnetic tapes, hard disks, floppy disks, flash memory, and optical data storage devices.
  • a computer readable recording medium such as ROM, RAM, CD-ROM, magnetic tapes, hard disks, floppy disks, flash memory, and optical data storage devices.

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

Abstract

L'invention concerne un appareil et un procédé permettant d'émettre et de recevoir un signal d'accusé de réception dans un système de communication mobile. L'appareil et le procédé permettant de recevoir le signal d'accusé de répception consistent rspectivement à calculer une probabilité selon laquelle le signal d'accusé de réception reçu est un signal de succès de réception et une probabilité selon laquelle le signal d'accusé de réception est un signal d'échec de réception, au moyen d'un taux d'erreurs par paquet estimé prévu sur la base d'un taux d'erreurs par paquet pré-établi et à déterminer si le signal d'accusé de réception est un signal de succès de réception ou d'échec de réception. L'appareil et le procédé d'émission et de réception d'un signal d'accusé de réception consistent notamment à déterminer des puissances d'émission d'un signal de succès de réception et d'un signal d'échec de réception afin de maximiser une différence entre un premier signal complexe et un second signal complexe, le premier signal complexe étant modulé pour la réussite de la réception et le second signal complexe pour l'échec de la réception, sur la base de la puissance d'émission moyenne et du taux d'erreurs par paquet requis pré-établi. L'appareil et le procédé d'émission de signaux d'accusé de réception permettent d'émettre un paquet unique indiquant les réussites ou les échecs de réception pour plusieurs paquets de données reçus en utilisant un codage de longueur variable sur la base d'un taux d'erreurs par paquet pré-établi. Selon l'invention, la non-uniformité de la fréquence entre le signal de réussite de réception et celui de l'échec de réception est réputée accroître le taux de réception correcte du signal d'accusé de réception.
PCT/KR2007/006285 2006-12-05 2007-12-05 Appareil et procédé d'émission et de réception d'un signal d'accusé de réception dans un système de communication mobile WO2008069574A1 (fr)

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KR1020070118517A KR100953567B1 (ko) 2006-12-05 2007-11-20 이동통신 시스템에서의 수신확인신호 송수신 장치 및 방법
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Citations (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US20060133290A1 (en) * 2004-12-21 2006-06-22 Bengt Lindoff ACK/NACK detection in wireless communication

Patent Citations (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US20060133290A1 (en) * 2004-12-21 2006-06-22 Bengt Lindoff ACK/NACK detection in wireless communication

Non-Patent Citations (1)

* Cited by examiner, † Cited by third party
Title
QUERNHEIM U., VERMOHLEN R., AGHADA VOODI JOLFAEI M.: "A new ARQ-scheme for multicast satellite communication", SATELLITE COMMUNICATIONS, ECSC-3, 1993., 3RD EUROPEAN CONFERENCE, 2 November 1993 (1993-11-02) - 4 November 1993 (1993-11-04), pages 11 - 15 *

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