WO2010076300A1 - Method and apparatus for robust transmission of control information in a wireless communication network - Google Patents

Method and apparatus for robust transmission of control information in a wireless communication network Download PDF

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Publication number
WO2010076300A1
WO2010076300A1 PCT/EP2009/067944 EP2009067944W WO2010076300A1 WO 2010076300 A1 WO2010076300 A1 WO 2010076300A1 EP 2009067944 W EP2009067944 W EP 2009067944W WO 2010076300 A1 WO2010076300 A1 WO 2010076300A1
Authority
WO
WIPO (PCT)
Prior art keywords
control information
mobile terminals
base station
transmitting
control
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/EP2009/067944
Other languages
English (en)
French (fr)
Inventor
Matthias Kamuf
Christian Bergljung
Bo Lincoln
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.)
Telefonaktiebolaget LM Ericsson AB
Original Assignee
Telefonaktiebolaget LM Ericsson AB
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by Telefonaktiebolaget LM Ericsson AB filed Critical Telefonaktiebolaget LM Ericsson AB
Priority to CN200980153372.5A priority Critical patent/CN102273307B/zh
Priority to JP2011542839A priority patent/JP5530457B2/ja
Priority to EP09804036.3A priority patent/EP2371174B1/en
Priority to BRPI0923910-3A priority patent/BRPI0923910B1/pt
Publication of WO2010076300A1 publication Critical patent/WO2010076300A1/en
Anticipated expiration legal-status Critical
Ceased legal-status Critical Current

Links

Classifications

    • 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
    • H04L5/0058—Allocation criteria
    • H04L5/0064—Rate requirement of the data, e.g. scalable bandwidth, data priority
    • 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
    • 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
    • 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
    • H04L5/0058—Allocation criteria
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04W—WIRELESS COMMUNICATION NETWORKS
    • H04W72/00—Local resource management
    • H04W72/20—Control channels or signalling for resource management
    • H04W72/23—Control channels or signalling for resource management in the downlink direction of a wireless link, i.e. towards a terminal

Definitions

  • the present invention generally relates to wireless communication networks, such as
  • THIRD GENERATION PARTNERSHIP PROJECT 3GPP
  • UE User Equipment
  • a given allocation of particular radiofrequency sub-carriers for a given interval of time is referred to as a Resource Block (RB), and resource allocations (uplink or downlink) generally are made on an ongoing, scheduled basis.
  • RB Resource Block
  • a DCI can be coded into up to 8 Channel Control Elements (CCEs), where a
  • CCE is defined as 36 Resource Elements (REs), or QPSK symbols, which is equivalent to 72 bits.
  • REs Resource Elements
  • QPSK symbols which is equivalent to 72 bits.
  • the lowest coding rate becomes X/576, where X is the number of un-coded bits — including a 16-bit CRC — for the DCI.
  • This code rate mainly determines the decoding performance achievable at the targeted mobile terminal, and thus determines that terminal's ability to reliably decode scheduled assignments.
  • a base station for use in a wireless communication network includes transmitter circuits and one or more processing circuits that are operatively associated with the transmitter circuits.
  • the transmitter circuits are configured to transmit control information and data traffic to mobile terminals in repeating transmission intervals, each transmission interval having a control portion that is defined for transmitting control information to targeted ones of the mobile terminals and a data portion that is defined for transmitting data traffic to targeted ones of the mobile terminals.
  • the processing circuits are configured to dynamically determine that the control portion has insufficient resources for transmitting control information to one or more of the mobile terminals, and, responsive to that determination, at least temporarily transmit control information in the data portion, rather than in the control portion, for a selected one or more of the mobile terminals.
  • the base station dynamically determines that the control portion has insufficient resources for transmitting control information to one or more of the mobile terminals by determining that an overall information-carrying capacity of the control portion is insufficient, in consideration of collective amounts of control information to be sent in the control portion and corresponding coding gains needed for reliable reception of that control information. Additionally, or alternatively, the base station dynamically determines that the control portion has insufficient resources for transmitting control information to one or more of the mobile terminals by determining that radio reception conditions at a particular one or more of the mobile terminals are such that a maximum coding gain achievable for control information transmitted in the control portion is insufficient for reliable reception of control information at the particular one or more of the mobile terminals.
  • Fig. 2 is a diagram of known CCE aggregations for transmitting control information on the PDCCH.
  • Fig. 3 is a block diagram of a wireless communication network, including one embodiment of a base station configured to selectively send control information in data regions of a transmission signal, and one embodiment of a mobile terminal configured to selectively search for and decode control information from the data regions of the base station's signal.
  • Fig. 4 is a block diagram depicting one embodiment of base station transmission and processing circuits.
  • the processing circuits 24 include a capacity evaluator 26 that is configured to determine, e.g., on a dynamic basis, whether the capacity of the control portion is insufficient for reliably transmitting to one, some, or any of mobile terminals 20 being supported by the base station 14.
  • An associated controller 28 is correspondingly configured to control whether control information is sent exclusively in the control portion, or sent in the data portion (for one or more of the mobile terminals 20). In other words, to the extent that the control portion capacity is deemed to be insufficient, the control information for a selected one or more of the mobile terminals 20 is shifted, at least temporarily, from transmission in the control portion to transmission in the data portion.
  • the base station 14 e.g., via the controller 28, is configured to select the selected one or more of the mobile terminals 20 according to a function that minimizes transmission resources in the data portion that are given over to the transmission of control information. Further, in one or more embodiments, the base station 14 is configured to dynamically determine that the control portion has insufficient resources for transmitting control information to one or more of the mobile terminals 20 by determining that an overall information-carrying capacity of the control portion is insufficient, in consideration of collective amounts of control information to be sent in the control portion and corresponding coding gains needed for reliable reception of that control information.
  • the downlink signal 40 comprises a number of sub-carriers collectively representing an OFDM frequency band.
  • the transmission intervals 42 comprise 1/2 millisecond sub-frames, with the control and data portions 44 and 46 comprising different time-frequency resources within the sub-frame.
  • the base station 14 transmits DCI pointers, as needed, on the PDCCH.
  • the DCI pointers point to the respective locations used for the E-PDCCH, i.e., the DCI pointers indicate where to find DCI in the PDSCH.
  • Each such pointer can be coded to the MAC ID or other identifier of a particular mobile terminal 20, such that a given mobile terminal 20 recognizes DCI pointers targeted to it.
  • One advantage of the pointers is that they are small, meaning that the maximum coding gain available in the PDCCH generally will be sufficient for reliably encoding them for transmission to mobile stations 20, even ones in poor channel conditions.
  • the DCI decoder 82 of the mobile terminal 20 is configured to blindly decode the DPCCH portion of received OFDM sub- frames, looking for DCI that is particularly targeted to the mobile terminal 20.
  • the DCI decoder 82 is further configured to decode DCI from the DPSCH, in at least some operating cases.
  • Fig. 13 illustrates another example of mobile terminal processing, wherein the mobile terminal 20 makes a selective determination as to whether it should or should not search for targeted DCI on the PDSCH of any given sub-frame.
  • the mobile terminal 20 searches the PDCCH in the current sub-frame for targeted DCI and for any targeted DCI pointers (Block 130). If the mobile terminal 20 finds targeted DCI on the PDCCH (YES from Block 132), it stops searching for DCI in the current sub-frame (Block 134).
  • the base station 14 sends control information targeted to that mobile terminal 20 using the data portion of the base station's transmissions.
  • the base station 14 uses a higher coding gain for that control information, and sends it on the E-PDCCH.
  • any control information decoded from the PDSCH may relate to the next sub-frame, thereby imposing an initial latency of one sub-frame, the scheduling information for the next sub-frame and decoding of the data indicated by the control information of the previous sub-frame can be carried out simultaneously.

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  • Engineering & Computer Science (AREA)
  • Signal Processing (AREA)
  • Computer Networks & Wireless Communication (AREA)
  • Mobile Radio Communication Systems (AREA)
PCT/EP2009/067944 2008-12-30 2009-12-28 Method and apparatus for robust transmission of control information in a wireless communication network Ceased WO2010076300A1 (en)

Priority Applications (4)

Application Number Priority Date Filing Date Title
CN200980153372.5A CN102273307B (zh) 2008-12-30 2009-12-28 用于在无线通信网络中对控制信息进行鲁棒传输的方法和设备
JP2011542839A JP5530457B2 (ja) 2008-12-30 2009-12-28 無線通信ネットワークにおける耐性のある制御情報送信の方法及び装置
EP09804036.3A EP2371174B1 (en) 2008-12-30 2009-12-28 Method and apparatus for robust transmission of control information in a wireless communication network
BRPI0923910-3A BRPI0923910B1 (pt) 2008-12-30 2009-12-28 método em uma estação base de rede de comunicação sem fio para transmitir informação de controle de enlace descendente a diversos terminais móveis, e, estação base

Applications Claiming Priority (4)

Application Number Priority Date Filing Date Title
US14127808P 2008-12-30 2008-12-30
US61/141,278 2008-12-30
US12/464,615 2009-05-12
US12/464,615 US8005039B2 (en) 2008-12-30 2009-05-12 Method and apparatus for robust transmission of control information in wireless communication network

Publications (1)

Publication Number Publication Date
WO2010076300A1 true WO2010076300A1 (en) 2010-07-08

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Family Applications (1)

Application Number Title Priority Date Filing Date
PCT/EP2009/067944 Ceased WO2010076300A1 (en) 2008-12-30 2009-12-28 Method and apparatus for robust transmission of control information in a wireless communication network

Country Status (6)

Country Link
US (1) US8005039B2 (enExample)
EP (1) EP2371174B1 (enExample)
JP (1) JP5530457B2 (enExample)
CN (1) CN102273307B (enExample)
BR (1) BRPI0923910B1 (enExample)
WO (1) WO2010076300A1 (enExample)

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