WO2011136587A2 - Apparatus and method for transmitting ack/nack in tdd system - Google Patents

Apparatus and method for transmitting ack/nack in tdd system Download PDF

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Publication number
WO2011136587A2
WO2011136587A2 PCT/KR2011/003162 KR2011003162W WO2011136587A2 WO 2011136587 A2 WO2011136587 A2 WO 2011136587A2 KR 2011003162 W KR2011003162 W KR 2011003162W WO 2011136587 A2 WO2011136587 A2 WO 2011136587A2
Authority
WO
WIPO (PCT)
Prior art keywords
ack
nack
transmission mode
feedback
selecting
Prior art date
Legal status (The legal status 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 status listed.)
Ceased
Application number
PCT/KR2011/003162
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English (en)
French (fr)
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WO2011136587A3 (en
Inventor
Yingyang Li
Ju-Ho Lee
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Samsung Electronics Co Ltd
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Samsung Electronics Co Ltd
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 Samsung Electronics Co Ltd filed Critical Samsung Electronics Co Ltd
Priority to EP11775292.3A priority Critical patent/EP2564540A4/en
Priority to JP2013507886A priority patent/JP5896987B2/ja
Publication of WO2011136587A2 publication Critical patent/WO2011136587A2/en
Publication of WO2011136587A3 publication Critical patent/WO2011136587A3/en
Anticipated expiration legal-status Critical
Ceased legal-status Critical Current

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    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
    • H04L5/00—Arrangements affording multiple use of the transmission path
    • H04L5/14—Two-way operation using the same type of signal, i.e. duplex
    • 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
    • H04L1/1614—Details of the supervisory signal using bitmaps
    • 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
    • H04L1/1635—Cumulative acknowledgement, i.e. the acknowledgement message applying to all previous messages
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
    • H04L1/00—Arrangements for detecting or preventing errors in the information received
    • H04L1/12—Arrangements for detecting or preventing errors in the information received by using return channel
    • H04L1/16—Arrangements for detecting or preventing errors in the information received by using return channel in which the return channel carries supervisory signals, e.g. repetition request signals
    • H04L1/18—Automatic repetition systems, e.g. Van Duuren systems
    • H04L1/1812—Hybrid protocols; Hybrid automatic repeat request [HARQ]
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
    • H04L1/00—Arrangements for detecting or preventing errors in the information received
    • H04L1/12—Arrangements for detecting or preventing errors in the information received by using return channel
    • H04L1/16—Arrangements for detecting or preventing errors in the information received by using return channel in which the return channel carries supervisory signals, e.g. repetition request signals
    • H04L1/18—Automatic repetition systems, e.g. Van Duuren systems
    • H04L1/1829—Arrangements specially adapted for the receiver end
    • H04L1/1854—Scheduling and prioritising arrangements
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
    • H04L1/00—Arrangements for detecting or preventing errors in the information received
    • H04L1/12—Arrangements for detecting or preventing errors in the information received by using return channel
    • H04L1/16—Arrangements for detecting or preventing errors in the information received by using return channel in which the return channel carries supervisory signals, e.g. repetition request signals
    • H04L1/18—Automatic repetition systems, e.g. Van Duuren systems
    • H04L1/1829—Arrangements specially adapted for the receiver end
    • H04L1/1861—Physical mapping arrangements
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
    • H04L5/00—Arrangements affording multiple use of the transmission path
    • H04L5/0001—Arrangements for dividing the transmission path
    • H04L5/0003—Two-dimensional division
    • H04L5/0005—Time-frequency
    • H04L5/0007—Time-frequency the frequencies being orthogonal, e.g. OFDM(A) or DMT
    • H04L5/001—Time-frequency the frequencies being orthogonal, e.g. OFDM(A) or DMT the frequencies being arranged in component carriers
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
    • H04L5/00—Arrangements affording multiple use of the transmission path
    • H04L5/003—Arrangements for allocating sub-channels of the transmission path
    • H04L5/0053—Allocation of signalling, i.e. of overhead other than pilot signals
    • H04L5/0055—Physical resource allocation for ACK/NACK
    • 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

Definitions

  • the DAI field in the PDCCH of each downlink sub-frame is used for indicating: up to the current downlink sub-frame, the total number of downlink sub-frames in which PDCCH is sent by the base station, and the value of DAI may be ‘1’, ‘2’, ‘3’, or ‘4’.
  • the LTE TDD system further requires a UE to return an ACK/NACK in an ACK / NACK channel which is determined by the last sub-frame where a PDCCH is received.
  • ACK/NACK For an LTE-A TDD system adopting CA, many bits are needed by the UE as the ACK/NACK to be returned. For example, when M equals four and the number of CCs is five, supposing the UE is configured to perform MIMO transmission, the UE needs to return ACK/NACK for forty transmission blocks (TBs) at the most. Specifically, if NACK and DTX(Discontinuity Transmission(TX)) are not distinguished (ACK/NACK is usually divided into three states: ACK ? the downlink data is successfully received, NACK ?
  • a method for transmitting an acknowledgement indicator (ACK/NACK) in a TDD system is provided.
  • a component carrier (CC) configuration for a user equipment (UE) and a transmission mode of each CC is received.
  • An ACK/NACK feedback mode is selected based on overhead information for feedback in an uplink.
  • An ACK/NACK is processed according to the selected feedback mode.
  • the ACK/NACK is transmitted in the uplink.
  • an apparatus for transmitting an acknowledgement indicator (ACK/NACK) in a TDD system includes a receiver, a hybrid automatic repeat request (HARQ) controller, and a transmitter.
  • the receiver receives a component carrier (CC) configuration for a user equipment (UE) and a transmission mode of each CC.
  • the HARQ controller selects an ACK/NACK feedback mode based on overhead information for feedback in an uplink.
  • the transmitter processes an ACK/NACK according to the selected feedback mode and transmits the ACK/NACK in the uplink.
  • Figure 4 is a block diagram of an ACK/NACK transmitter in TDD system according to an embodiment of the present invention.
  • step 102 ACK/NACK is fed back directly, or the ACK/NACK is processed with a small amount of processing to remove some bits, and the processed ACK/NACK is fed back in uplink.
  • the second ACK/NACK feedback mode includes bundling ACK/NACKs for data in at most M sub-frames, and the bundling is performed on each CW, i.e., when MIMO transmission is adopted, ACK/NACK for two CWs in a CC are bundled and fed back by the UE respectively.
  • the second ACK/NACK feedback mode is adopted, i.e., bundling ACK/NACKs for data transmitted in up to M sub-frames in one CC, and the bundling is performed for each CW respectively (step 303).
  • Figure 4 is a block diagram of an ACK/NACK transmitter in TDD system according to an embodiment of the present invention.
  • the HARQ controller 408 selects the ACK/NACK feedback mode according to criteria for selecting a proper ACK/NACK feedback mode.
  • the basis for selecting a proper ACK/NACK feedback mode may be the value of M, the number of CCs configured for the UE to receive, or whether MIMO is adopted for downlink data transmission.
  • the basis may be the total number of CWs in all the CCs that are configured for the UE to receive, and is irrelevant to the value of M.
  • the basis may also be the maximum number of TBs in all the CCs configured for the UE, the number of bits needed for feeding back ACK/NACKs in uplink, or any combination of the above mentioned bases.
  • the method provided by the present invention can help to avoid excessive overhead for feedback in uplink in various extreme circumstances while ensuring satisfying downlink performance under many configurations.
  • uplink feedback in various situations has similar amount of overhead, thereby eliminating the need of designing dedicated feedback channels and feedback manners for extreme situations where an ACK/NACK of the maximum number of bits is to be fed back. Consequently, requirements, implementation complexity, and difficulty level of devices may be reduced.

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  • Engineering & Computer Science (AREA)
  • Signal Processing (AREA)
  • Computer Networks & Wireless Communication (AREA)
  • Mobile Radio Communication Systems (AREA)
  • Detection And Prevention Of Errors In Transmission (AREA)
PCT/KR2011/003162 2010-04-30 2011-04-28 Apparatus and method for transmitting ack/nack in tdd system Ceased WO2011136587A2 (en)

Priority Applications (2)

Application Number Priority Date Filing Date Title
EP11775292.3A EP2564540A4 (en) 2010-04-30 2011-04-28 Apparatus and method for transmitting ack/nack in tdd system
JP2013507886A JP5896987B2 (ja) 2010-04-30 2011-04-28 時分割複信システムにおける応答信号の伝送装置及びその方法

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
CN201010176422.6A CN102237991B (zh) 2010-04-30 2010-04-30 在tdd系统中发送ack/nack信息的方法
CN201010176422.6 2010-04-30

Publications (2)

Publication Number Publication Date
WO2011136587A2 true WO2011136587A2 (en) 2011-11-03
WO2011136587A3 WO2011136587A3 (en) 2012-03-01

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US (2) US8705413B2 (enExample)
EP (1) EP2564540A4 (enExample)
JP (1) JP5896987B2 (enExample)
KR (1) KR101852399B1 (enExample)
CN (1) CN102237991B (enExample)
WO (1) WO2011136587A2 (enExample)

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Publication number Publication date
JP5896987B2 (ja) 2016-03-30
EP2564540A4 (en) 2018-01-10
US20140226543A1 (en) 2014-08-14
WO2011136587A3 (en) 2012-03-01
KR20110121551A (ko) 2011-11-07
US20110267995A1 (en) 2011-11-03
JP2013530585A (ja) 2013-07-25
KR101852399B1 (ko) 2018-04-26
US9450742B2 (en) 2016-09-20
CN102237991B (zh) 2016-08-24
CN102237991A (zh) 2011-11-09
EP2564540A2 (en) 2013-03-06
US8705413B2 (en) 2014-04-22

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