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WO2008082119A1 - Appareil et procédé de transmission de signaux en liaison montante dans un système de communication sans fil - Google Patents

Appareil et procédé de transmission de signaux en liaison montante dans un système de communication sans fil Download PDF

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Publication number
WO2008082119A1
WO2008082119A1 PCT/KR2007/006764 KR2007006764W WO2008082119A1 WO 2008082119 A1 WO2008082119 A1 WO 2008082119A1 KR 2007006764 W KR2007006764 W KR 2007006764W WO 2008082119 A1 WO2008082119 A1 WO 2008082119A1
Authority
WO
WIPO (PCT)
Prior art keywords
signal
allocated
ranging
control
uplink
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/KR2007/006764
Other languages
English (en)
Inventor
Jae-Hyun Ahn
Kuk-Jin Song
Jae-Hyeong Kim
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.)
Posdata Co Ltd
Original Assignee
Posdata 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
Priority claimed from KR1020070046213A external-priority patent/KR100880885B1/ko
Application filed by Posdata Co Ltd filed Critical Posdata Co Ltd
Priority to US12/521,778 priority Critical patent/US20100111005A1/en
Publication of WO2008082119A1 publication Critical patent/WO2008082119A1/fr
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
    • H04L5/02—Channels characterised by the type of signal
    • H04L5/023—Multiplexing of multicarrier modulation signals, e.g. multi-user orthogonal frequency division multiple access [OFDMA]
    • 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
    • H04L1/0001—Systems modifying transmission characteristics according to link quality, e.g. power backoff
    • H04L1/0023—Systems modifying transmission characteristics according to link quality, e.g. power backoff characterised by the signalling
    • H04L1/0026—Transmission of channel quality indication
    • 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
    • H04L1/0078—Avoidance of errors by organising the transmitted data in a format specifically designed to deal with errors, e.g. location
    • H04L1/0079—Formats for control data
    • 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
    • H04L1/1671—Details of the supervisory signal the supervisory signal being transmitted together with control information
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
    • H04L27/00—Modulated-carrier systems
    • H04L27/26—Systems using multi-frequency codes
    • H04L27/2601—Multicarrier modulation systems
    • H04L27/2602—Signal structure
    • H04L27/261—Details of reference signals
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
    • H04L27/00—Modulated-carrier systems
    • H04L27/26—Systems using multi-frequency codes
    • H04L27/2601—Multicarrier modulation systems
    • H04L27/2602—Signal structure
    • H04L27/261—Details of reference signals
    • H04L27/2613—Structure of the reference 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
    • H04L5/0044—Allocation of payload; Allocation of data channels, e.g. PDSCH or PUSCH
    • 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
    • H04L5/0048—Allocation of pilot signals, i.e. of signals known to the receiver

Definitions

  • the present invention relates to an apparatus and method for transmitting uplink signals in a wireless telecommunication system, more particularly, to an apparatus and method for time-divisionally transmitting control signals of uplink frame that a terminal transmits to a base station in an OFDMA wireless telecommunication system.
  • the portable internet system like the mobile WiMAX is capable of providing the high speed data service when a user moves in a radio environment. Additionally, it can simultaneously provide internet service to multi-users by using the OFDMA (Orthogonal Frequency Division Multiple Access) with a multiple access mode. Additionally, by using the TDD (Time Division Duplexing) with dual mode, which divides the downlink and the uplink according to time, the two-way communication between the terminal and the base station can be available.
  • OFDMA Orthogonal Frequency Division Multiple Access
  • TDD Time Division Duplexing
  • Figure 1 exemplifies the frame structure which is used in a portable Internet system based on the IEEE 802.16d/e.
  • one frame is divided into the downlink frame (DL Frame) that the base station transmits to the terminal and the uplink frame (UL Frame) that the terminal transmits to the base station. And, the two- way communications is performed through them.
  • the uplink frame includes a control channel and an uplink burst, while the control channel is used as the ranging channel, the CQI (Channel Quality Indicator) channel, and the ACK (Acknowledgement) channel.
  • the terminal uses a limited power due to the mobility.
  • the intensity of the uplink signal which each terminal transmits is limited by the maximum subchannel number allocated to each symbol duration. For example, assuming that the terminal transmits the uplink burst by using the usable maximum power during the unit symbol duration, the power spectral density PSD becomes lower when two subchannels are used than one subchannel is used in the same symbol duration.
  • FIG. 2 shows the case in which each terminal (terminal a ⁇ terminal d) transmits the uplink signal (uplink burst) with different numbers of subchannels.
  • the power spectral density of the uplink signal which each terminal transmits is changed according to the maximum number of subchannels allocated to each symbol duration.
  • the power spectral density indicates the electric power per unit frequency, which means the value dividing the total power which the terminal used by the total frequency band that the corresponding terminal used for the unit symbol duration, while the unit is W/Hz.
  • the terminal a transmits signals by using one subchannel (Subchannel #1) during four consecutive symbol duration (Symbol #1 ⁇ #4), and the power spectral density is 20mW/(8.75mhz/30) (here, it is assumed that the maximum power that each terminal can use during the unit symbol duration is 2OmW).
  • the terminal b transmits signals by using one subchannel (Subchannel #2) during two symbol duration (Symbol #1, #2), while the power spectral density is also 20mW/(8.75mhz/30).
  • the terminal c transmits signals by using two subchannels (Subchannel #2, #3) in a specific symbol duration(Symbol #3), thereby, it has the power spectral density of 10mW/(8.75mhz/30) which is a half of the power spectral density of other terminal.
  • the invention has been designed to solve the above-mentioned problems, and it is an object of the invention to provide an apparatus and method for time-divisionally transmitting the uplink frame which a terminal transmits to a base station in a wireless telecommunication system in order that subchannels of a proper number is allocated to each symbol duration.
  • an apparatus for transmitting uplink signals in a wireless telecommunication system which comprises signal allocating means for checking control signals for transmitting through a control channel of an uplink frame, and, in case a plurality of control signals are scheduled to be allocated to a first symbol duration among symbol duration of the control channel, allocating at least one among the plurality of control signals to a second symbol duration; and signal transmission means for transmitting the control signal in a corresponding symbol duration according to a scheduling scheme allocated by the signal allocating means.
  • an apparatus for transmitting uplink signals in a wireless telecommunication system which comprises signal allocating means for checking uplink signals which are scheduled to be allocated to each symbol duration of an uplink frame, and, in case the number of subchannels of the uplink signals which are scheduled to be allocated to a first symbol duration among the symbol duration exceeds a preset threshold, allocating at least one uplink signal to a second symbol duration to generate a scheduling information; and signal transmission means for transmitting the uplink signals by loading on corresponding subchannels according to the scheduling information.
  • a method for transmitting uplink signals in a wireless telecommunication system which comprises the steps of: a) checking the number of subchannels which are scheduled to be allocated to each symbol duration of an uplink frame; b) allocating, with respect to a symbol in which the number of the checked subchannels exceeds a preset threshold, a part of the subchannels scheduled to be allocated to the symbol to other symbol; and c) transmitting uplink signals through the allocated subchannels.
  • a method for transmitting uplink signals in a wireless telecommunication system which comprises the steps of: a) checking a control signal to be transmitted through a control channel of an uplink frame; b) in case a plurality of control signals are scheduled to be allocated to a first symbol duration among symbols of the control channel, allocating at least one among the plurality of control signals to a second symbol duration; and c) transmitting the allocated control signal.
  • a method for transmitting uplink signals in a wireless telecommunication system which comprises the steps of: a) checking a control signal to be transmitted through a control channel of an uplink frame; b) in case a plurality of control signals are scheduled to be allocated to the same symbol among symbols of the control channel, scheduling the plurality of control signals according to a priority by time dispersion; and c) transmitting a corresponding control signal according to the scheduled order.
  • the transmission power spectral density can be increased by transmitting the uplink signal which the terminal transmits to the base station with time dispersion in order that the uplink signal of proper number is allocated to each symbol duration, thereby, the error rate of the uplink signal can be reduced.
  • the uplink signals can be efficiently transmitted dispersedly according to a situation by controlling the maximum number of subchannels which can be allocated to a single symbol duration according to the residual electric power value of a terminal.
  • the error rate of the control signal can be decreased by transmitting the control signal through the control channel by time dispersion according to the priority.
  • Figure 1 is a drawing showing a frame structure which is used in a portable Internet system based on the IEEE 802.16d/e.
  • Figure 2 is a drawing showing a power spectral density that each terminal uses for the uplink signal.
  • Figure 3 is a drawing illustrating a backoff algorithm used for a contention-based ranging.
  • Figure 4 is a drawing showing a slot size for a control channel of different type.
  • FIG. 5 is a configuration diagram of an apparatus for uplink signal transmitting according to the present invention.
  • Figure 6 is a drawing illustrating a control signal allocation scheme according to the present invention, in case the control channel of the uplink frame is formed with three symbols.
  • Figure 7 is a drawing illustrating a typical control signal allocation scheme, in case the control channel of the uplink frame is formed with six symbols.
  • Figs. 8 and 9 are drawings illustrating a control signal allocation scheme according to the present invention, in case the control channel of the uplink frame is formed with six symbols.
  • FIG. 10 is a drawing illustrating a control signal allocation scheme according to the present invention, in case the control signal is scheduled to be allocated respectively to the CQI channel region and ACK channel region of the same uplink frame in connection with Figure 8.
  • FIG 11 is a drawing illustrating a control signal allocation scheme according to the present invention, in case the control signal is scheduled to be allocated respectively to the ranging channel region and CQI channel region of the same uplink frame in connection with Figure 8.
  • FIGs. 12 and 13 are flowcharts illustrating the method of the uplink signal transmission according to the present invention. Mode for the Invention
  • control channel which is included in an uplink frame will be illustrated.
  • the control channel is usually positioned in the beginning part of the uplink frame, and includes a CDMA ranging channel, a CQI channel, and an ACK channel.
  • the CDMA ranging channel is used for an initial ranging, a hand-off ranging, a periodic ranging, and a bandwidth request ranging.
  • the initial ranging is performed for the system channel and the synchronous acquisition when the terminal connects to a network for the first time.
  • the hand-off ranging is performed when a hand-off is processed from a serving base station to a target base station.
  • the periodic ranging is periodically performed in order that the terminal is capable of the synchronization tracing.
  • the bandwidth request ranging is performed when the terminal requires the base station of a bandwidth. In case the terminal is unable to succeed in a ranging, the connection between the base station and the terminal may be disconnected or a proper resource allocation may not be performed. In this case, the terminal can waste time for the reconnection with the base station.
  • the ranging when the ranging is classified according to mode, it can be divided into a message-based ranging and a contention-based ranging. However, since the message-based ranging is not allocated to the control channel region, hereinafter, the contention-based ranging will be illustrated.
  • the contention-based ranging uses CDMA and a backoff algorithm.
  • the terminal selects one code in a pre-defined code set of downlink channel descriptor DCD at random, and selects one number in a backoff window range at random. These are selected with the same probability respectively.
  • the selected code becomes the ranging code, while the selected number becomes the backoff number. After deferring the slots corresponding to the backoff number, the terminal transmits the ranging code in the next slot.
  • the region (ranging region) for the CDMA contention-based ranging is comprised of slots.
  • the slot is a unit necessary for transmitting one CDMA code.
  • the size of the slot is changed according to the ranging type.
  • the backoff is performed by the slot. Generally, since the number of backoff is greater than the number of slot of the ranging region included within one frame, the more slots are required for deferring. Hence, after deferring the slots in the ranging region of the current frame, the terminal performs deferring the remained slots in the succeeding frame.
  • Figure 3 exemplifies a backoff algorithm when the number of backoff is set as 11.
  • a first frame includes the ranging region consisting of four slots. Accordingly, the deferring is performed for four slots among the total eleven slots, thus, the number of residual slots is seven.
  • a second frame includes the ranging region consisting of six slots, and the deferring is performed for six slots among the residual slots after the first frame, thus, the number of residual slot is one.
  • a third frame includes the ranging region consisting of three slots, and the deferring is performed for the one residual slot after the second frame. Thereafter the ranging code is transmitted in the next slot of the third frame.
  • the CQI (Channel Quality Indicator) channel is used when the terminal transmits the status information (DL CINR estimation information) on the downlink channel to the base station.
  • the terminal receives 'CQICH Allocation IE' from the base station, the terminal performs the code-based channel quality reporting.
  • the information related to the CQI report is included in the 'CQICH Allocation IE', and the terminal transmits the CQI value (CQI code) corresponding to the channel CINR measured from the downlink signal to the base station.
  • the CQI code is not correctly transmitted, the base station cannot recognize the state of the downlink channel. Then, the downlink scheduling (DL scheduling) performance of the base station can be lowered.
  • the ACK (Acknowledgement) channel is used when the ACK/NACK signal informing whether there is an error of the receipt packet is transmitted to the base station in the system to which the ARQ (Automatic Repeat Request) is applied.
  • the ACK channel is allocated correspondingly to the CID (Connection Identifier).
  • the ACK/NACK message is consecutively mapped to the region which is previously allocated. In case an error is generated in the ACK/NACK signal, the packet can be lost or the loss of the transmission resource can be occurred due to the unnecessary retransmission.
  • the slot size of the above-described control channels is changed according to the type of the control channel.
  • the slot for the initial ranging and hand-off ranging is formed with two symbols and six subchannels
  • the slot for the periodic ranging and bandwidth request ranging is formed with one symbol and six subchannels.
  • the slot of the CQI channel is formed with three symbols and one subchannel.
  • the slot of the ACK channel is formed with three symbols and 1/2 subchannel.
  • FIG. 5 is a configuration diagram of a signal transmitting apparatus 100 according to the present invention. As shown, the signal transmitting apparatus includes residual power measurement means 110, signal allocating means 120 and signal transmission means 130.
  • the residual power measurement means 110 measures the residual electric power of the terminal and transmits to the signal allocating means.
  • the signal allocating means 120 checks the uplink signal (or the subchannel number) scheduled to be allocated to each symbol duration, and allocates at least one signal to other symbol duration in case the excessive uplink signal is scheduled to be allocated to the unit symbol duration.
  • the subchannel number scheduled to be allocated to the unit symbol duration exceeds a preset threshold, it allocates at least one uplink signal to other symbol duration for the time dispersion of a signal.
  • the threshold value is a value limiting the maximum subchannel number which can be allocated to the unit symbol duration so as to enhance the power spectral density, which, for example, can be set up with reference to the residual electric power value transmitted from the residual power measurement means 110.
  • the signal allocating means 120 can perform the time dispersion of a signal by allocating at least one control signal to other symbol (second symbol) duration. Referring to Figs. 6 to 11, it will be described in the below in detail.
  • the signal transmission means 130 transmits the uplink signal by loading on a corresponding subchannel according to the scheduling information (uplink signal allocation information) which is transmitted from the signal allocating means 120.
  • the signal allocating means 120 uses a different scheduling algorithm according to the structure of the control channel.
  • the scheduling method will be illustrated for the case in which the control channel is formed with three symbols and for the case in which the control channel is formed with six symbols.
  • FIG. 6 is a drawing illustrating a control signal allocation scheme (scheduling method) according to the present invention, in case the control channel of the uplink frame is formed with three symbols.
  • the initial ranging and the hand-off ranging region are formed through the first and second symbol duration of the uplink frame.
  • the periodic ranging and the bandwidth request ranging region are formed in the third symbol duration of the uplink frame.
  • the ranging transmission slot of L (L is a positive integer) can be allocated to the ranging region.
  • the CQI channel region is formed through the initial three symbols of the uplink frame.
  • the CQI transmission slot of M (M is a positive integer) can be allocated.
  • the ACK channel region is formed through initial three symbols of the uplink frame.
  • the ACK transmission slot of N N is a positive integer
  • the present invention allocates the control signal time-divisionally according to the priority.
  • the CQI signal and ACK signal to which the transmission duration is allocated by the base station have a higher priority than the periodic ranging signal and bandwidth request ranging signal in which the transmission duration is selected by the terminal at random.
  • the priority of the periodic ranging signal is higher. It can be expressed like this.
  • the bandwidth request ranging is delayed as much as the ranging opportunities of L.
  • L is the number of slots corresponding to the ranging region, accordingly, the bandwidth request ranging is performed in the next frame (second uplink frame) after the deferring the slots of L.
  • the backoff window size does not become two times, because it does not clashes with the ranging of other terminal.
  • Figure 7 is a drawing illustrating a typical control signal allocation scheme, in case the control channel of the uplink frame is formed with six symbols.
  • the initial ranging and hand-off ranging region are formed through the initial four symbol duration of the uplink frame, while the periodic ranging and bandwidth request ranging region are formed in the fifth and the sixth symbol duration of the uplink frame.
  • the ranging transmission slots of 2L L is a positive integer
  • the opportunity is allocated for the same subchannel in order of symbol. Then, the opportunity is allocated for the next subchannel in order of symbol after one subchannel is all allocated.
  • the CQI channel region is formed through the initial six symbol duration of the uplink frame.
  • the CQI transmission slots of 2M M is a positive integer
  • the ACK channel region is formed through the initial six symbol duration of the uplink frame.
  • the ACK transmission slots of 2N N is a positive integer
  • the opportunity is all allocated for the initial three symbols in order of subchannel. Then, the opportunity is allocated for the next three symbols in order of subchannel.
  • control signal allocation scheme will be illustrated in case the control channel of the uplink frame is formed with six symbols.
  • the control channel structure is divided into a first symbol portion (the first half symbol portion) consisting of the initial three symbols and a second symbol portion (the second half symbol portion) consisting of the latter three symbols.
  • the control channel slot of each type can be allocated to both the first symbol portion and the second symbol portion.
  • the opportunity is allocated for the same subchannel in order of symbol. Then, the opportunity is allocated for the next subchannel in order of symbol after one subchannel is all allocated.
  • the opportunity is all allocated for the first symbol portion in order of subchannel. Thereafter, the opportunity is allocated for the second symbol portion in order of subchannel.
  • the ranging (the periodic ranging, the bandwidth request ranging) signal is scheduled to be allocated to the current frame with the CQI signal and the ACK signal, the ranging backoff is delayed as much as 2L slots to be performed in the next frame.
  • the ranging backoff precedes or is delayed as much as one slot to be allocated in a different symbol portion. It is shown in Figure 11, and Figure 11a shows that the ranging signal is delayed as much as one time ranging opportunity to be allocated to the second symbol portion in case the CQI signal and the ranging signal are scheduled to be allocated to the first symbol portion, Figure 1 Ib shows that the ranging signal precedes as much as one time ranging opportunity to be allocated to the first symbol portion in case the CQI signal and the ranging signal are scheduled to be allocated to the second symbol portion.
  • the bandwidth request ranging signal is delayed as much as 2L slots to be performed in the next frame.
  • the bandwidth request ranging signal precedes or is delayed as much as one time ranging opportunity to be allocated to other symbol portion.
  • the bandwidth request ranging signal is delayed as much as 2L slots to be performed in the next frame.
  • Figure 12 is a flowchart showing a signal transmission method according to an embodiment of the present invention.
  • the terminal checks the number of subchannels which are scheduled to be allocated to each symbol duration of the uplink frame.
  • the terminal allocates a part of the subchannels scheduled to be allocated to the symbol to other symbol.
  • the threshold can be adjusted according to the residual electric power value of the terminal.
  • the terminal transmits the uplink signal to the base station through the allocated subchannels.
  • Figure 13 is a flowchart illustrating the method of signal transmitting with time dispersion according to another embodiment of the present invention.
  • the terminal checks the control signal for transmitting through the control channel region of the uplink frame.
  • the terminal allocates at least one among the plurality of control signals to a second symbol duration.
  • the terminal performs scheduling with time dispersion of the plurality of control signals according to the priority. For example, the control signal which has a relatively low priority among the plurality of control signals is allocated to the second symbol duration.
  • the priority can be set in sequence of the CQI signal, the periodic ranging signal, and the bandwidth request ranging signal.
  • the terminal can allocates the periodic ranging signal and/or the bandwidth request ranging signal to the next frame by using the backoff algorithm.
  • the terminal transmits the allocated control signal to the base station.
  • the preset time point of transmission of the control signals are identical, the periodic ranging signal and the bandwidth request ranging signal are transmitted through the control channel of the second uplink frame.
  • the periodic ranging signal and the bandwidth request ranging signal precede and transmitted.
  • the bandwidth request ranging signal can be delayed than the periodic ranging signal to be transmitted.

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  • Engineering & Computer Science (AREA)
  • Signal Processing (AREA)
  • Computer Networks & Wireless Communication (AREA)
  • Quality & Reliability (AREA)
  • Mobile Radio Communication Systems (AREA)

Abstract

La présente invention concerne un appareil et un procédé de transmission de signaux en liaison montante dans un système de télécommunications sans fil. Cette invention est caractérisée en ce qu'au moins un signal en liaison montante est affecté à une autre durée de symbole d'une dispersion temporelle dans le cas où plusieurs signaux en liaison montante sont programmés pour être affectés à la même durée de symbole de la trame en liaison montante que le terminal envoie à la station de base. En conséquence, le terminal peut renforcer la densité spectrale de puissance du signal en liaison montante, ce qui permet de réduire le taux d'erreur.
PCT/KR2007/006764 2006-12-31 2007-12-21 Appareil et procédé de transmission de signaux en liaison montante dans un système de communication sans fil Ceased WO2008082119A1 (fr)

Priority Applications (1)

Application Number Priority Date Filing Date Title
US12/521,778 US20100111005A1 (en) 2006-12-31 2007-12-21 Apparatus and method for transmitting uplink signals in a wireless communication system

Applications Claiming Priority (4)

Application Number Priority Date Filing Date Title
KR20060139231 2006-12-31
KR10-2006-0139231 2006-12-31
KR10-2007-0046213 2007-05-11
KR1020070046213A KR100880885B1 (ko) 2006-12-31 2007-05-11 무선통신 시스템에서의 상향링크 신호 전송 장치 및 방법

Publications (1)

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WO2008082119A1 true WO2008082119A1 (fr) 2008-07-10

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PCT/KR2007/006764 Ceased WO2008082119A1 (fr) 2006-12-31 2007-12-21 Appareil et procédé de transmission de signaux en liaison montante dans un système de communication sans fil

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Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN102291837A (zh) * 2011-08-12 2011-12-21 电信科学技术研究院 一种周期性srs的处理方法和设备

Non-Patent Citations (3)

* Cited by examiner, † Cited by third party
Title
TTA: "Specifications for 2.6GHz band portable internet service - Physical & Medium Access Control Layer", TTAS.KO-06.0082/R1.21, 21 December 2005 (2005-12-21) *
TTA: "Wibro Standard Technology", TTA-06012-SD, 19 June 2006 (2006-06-19), pages 57 - 63, 103 - 106 *
WANG F. ET AL.: "IEEE 802.16e system performance: analysis and simulations", PERSONAL, INDOOR AND MOBILE RADIO COMMUNICATIONS, 2005. PIMRC 2005. IEEE 16TH INTERNATIONAL SYMPOSIUM, vol. 2, 11 September 2005 (2005-09-11) - 14 September 2005 (2005-09-14), pages 900 - 904, XP010926630 *

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN102291837A (zh) * 2011-08-12 2011-12-21 电信科学技术研究院 一种周期性srs的处理方法和设备

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