WO2009113807A2 - Procédé de production de données et de transmission de canal de synchronisation dans un système de communications mobiles - Google Patents

Procédé de production de données et de transmission de canal de synchronisation dans un système de communications mobiles Download PDF

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Publication number
WO2009113807A2
WO2009113807A2 PCT/KR2009/001211 KR2009001211W WO2009113807A2 WO 2009113807 A2 WO2009113807 A2 WO 2009113807A2 KR 2009001211 W KR2009001211 W KR 2009001211W WO 2009113807 A2 WO2009113807 A2 WO 2009113807A2
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Prior art keywords
sub
channel
sync
synchronization
generating
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Ceased
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PCT/KR2009/001211
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English (en)
Korean (ko)
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WO2009113807A3 (fr
Inventor
한승희
권영현
곽진삼
김동철
문성호
노민석
이현우
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LG Electronics Inc
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LG Electronics Inc
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Priority claimed from KR1020080069667A external-priority patent/KR101430486B1/ko
Application filed by LG Electronics Inc filed Critical LG Electronics Inc
Priority to US12/922,049 priority Critical patent/US8743855B2/en
Publication of WO2009113807A2 publication Critical patent/WO2009113807A2/fr
Publication of WO2009113807A3 publication Critical patent/WO2009113807A3/fr
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
    • H04L27/00—Modulated-carrier systems
    • H04L27/26—Systems using multi-frequency codes
    • H04L27/2601—Multicarrier modulation systems
    • H04L27/2647—Arrangements specific to the receiver only
    • H04L27/2655—Synchronisation arrangements
    • H04L27/2662—Symbol synchronisation
    • 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
    • H04L27/2605—Symbol extensions, e.g. Zero Tail, Unique Word [UW]
    • H04L27/2607—Cyclic extensions
    • 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
    • H04L5/0001—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

Definitions

  • the present invention relates to a mobile communication system, and more particularly, to a method for generating data and transmitting a synchronization channel in a multi-carrier multiple access communication system.
  • FIG. 1 illustrates a process of generating a signal using multiple carriers in a transmitting side in the prior art.
  • an input data sequence consisting of N pieces of data Is made of a plurality of parallel data sequences through a serial-to-parallel converter 100.
  • the serial-to-parallel transform unit is interworked with a subcarrier modulator 110-0, 110-1, ..., 110-k in the following Inverse Fast Fourier Transform (IFFT) unit 105. It is then determined how many parallel data sequences the input data sequence will be converted to. In the following description, it is assumed that the high-speed input data sequence is converted into k low-speed parallel data sequences in the serial-parallel converter 100.
  • IFFT Inverse Fast Fourier Transform
  • the IFFT unit 105 carries a different subcarrier on each of the k low-speed parallel data sequences input to the IFFT unit 105 (that is, after subcarrier modulation) and subsequently performs parallel-to-serial conversion.
  • the unit 110 is used to generate a serial IFFT transformed input data sequence. Thereafter, the IFFT-converted input data sequence is transmitted to the receiver through an RF (Radio frequency) unit 130.
  • RF Radio frequency
  • OFDM orthogonal frequency division multiplexing
  • k subcarriers 110-0 and 110- are allocated to k parallel data sequences in the IFFT unit 105. 1,..., 110-k) are arranged to be orthogonal to each other on the frequency to be frequency-divided so that there is no interference between each subcarrier.
  • an input data sequence in a digital communication system is composed of a combination of ones or zeros, and in the time domain, the input data sequence is a rectangular wave on / off.
  • a square wave is represented by the sum of frequency components of integer multiples when Fourier transform is performed. That is, the data representation in the time domain is represented by the data in the frequency domain. That is, any digital data may be represented in a time domain or in a frequency domain corresponding thereto.
  • each parallel data in terms of frequency domain is obtained by multiplying each parallel data sequence by subcarriers having different frequencies from each other corresponding to each parallel data sequence (subcarrier modulation process). The frequency of the sequence becomes higher by the frequency of the multiplied subcarrier.
  • Each parallel data sequence modulated with subcarriers is then represented as an input data sequence in the time domain IFFT transformed via a parallel-serial unit 130.
  • Equation 2 shows an input data sequence passed through an IFFT having a size of N (N-size).
  • Equation 2 F-1 means an inverse Fourier transform matrix.
  • the IFFT-converted input data sequence is called a multicarrier symbol.
  • a cyclic prefix (CP) may be inserted into this multicarrier symbol.
  • the CP is formed by copying and pasting a certain part of the back of the multicarrier symbol at the front of the multicarrier symbol, and the multipath of the received multicarrier symbol due to the multipath of the received multicarrier symbol before the main data of the multicarrier symbol arrives at the receiver. Eliminate the impact
  • a CP adder (not shown in FIG. 1) may be added to the IFFT unit 120 to add a CP to the multicarrier symbol.
  • the frequencies of the respective subcarriers of FIG. 1 are orthogonal to each other in the frequency domain, and each parallel data sequence modulated by the subcarriers is orthogonal to each other in the frequency domain. do.
  • the terminal first receives a synchronization channel (SCH) and performs synchronization acquisition and cell search for smooth data transmission and reception with the base station using information contained in the synchronization channel.
  • SCH synchronization channel
  • a series of processes in which a terminal acquires synchronization from a base station and obtains a cell ID to which the terminal belongs is called a cell search.
  • Cell search is an initial cell search performed when the terminal is initially powered on, and a neighbor cell search in which a terminal in a connection or idle mode searches for an adjacent base station. search).
  • a system configuration is implemented on a cell basis.
  • the terminal In order for a terminal of each specific location to access a mobile communication service, the terminal synchronizes with a base station that receives a signal having the strongest signal in terms of signal characteristics. Gain motivation). To this end, the base station transmits a signal for allowing the terminals in the base station to obtain synchronization through its synchronization channel to its own synchronization information.
  • RACH random access channel
  • the synchronization channel is used for the terminal to acquire time synchronization and frequency synchronization with the base station at the initial connection, and the terminal acquires the cell ID and additional control information of the base station in accordance with the obtained and detected time synchronization and frequency synchronization. It is used to make it possible. As such, the terminal acquires synchronization of time and frequency with the base station, cell ID of the base station, and additional control information related thereto through a synchronization channel. That is, the synchronization acquisition process of the terminal may be largely divided into the frequency synchronization, time synchronization and the cell ID acquisition process of the base station.
  • the terminal performs a frequency offset estimation and compensation for time synchronization and frequency synchronization with the base station using the synchronization channel transmitted from the base station, and then obtains a cell ID of the base station.
  • the process of acquiring a cell ID may include performing a frame synchronization by searching a cyclic prefix CP of a transmission frame of a physical channel transmitting a sync channel in a blind manner and a cell group included in the sync channel. ID and cell ID, and if necessary, the antenna configuration included in the synchronization channel (antenna configuration detection) and downlink frequency hopping indicator (DL frequency hopping indication), an example of frequency configuration information
  • the process may further include.
  • the UE may once again confirm the cell ID acquired in the previous step by using a reference signal such as a pilot signal of the downlink transmitted from the base station in order to secure a more reliable cell ID.
  • a reference signal such as a pilot signal of the downlink transmitted from the base station
  • the synchronization acquisition of the terminal undergoes a multi-step acquisition process.
  • the synchronization channel needs to be subdivided to fit each step.
  • An object of the present invention has been proposed to meet the above necessity in the prior art, and an object of the present invention is to provide a data generating method having a high transmission efficiency in a mobile communication system.
  • Another object of the present invention is to provide a method for generating and transmitting a synchronization channel including one or more sub-sync channels in a mobile communication system using multiple carriers.
  • Multi-carrier subsymbol (hereinafter referred to as 'sub-symbol') is a kind of multi-carrier symbol in a mobile communication system using the multi-carrier transmission scheme proposed by the present invention and occupies less time domain or less frequency domain than conventional multi-carrier symbols. It means a multi-carrier symbol or a multi-carrier symbol occupying the same time domain and frequency domain, but merged in a code division multiplexing scheme. Therefore, the conventional multi-carrier symbol may include two or more subsymbols proposed by the present invention.
  • two or more subsymbols may be multiplexed to be allocated to a radio resource region for one multicarrier symbol.
  • Multiplexing methods that combine two or more subsymbols include time division multiplexing (TDM), frequency division multiplexing (FDM), and code division multiplexing (CDM). It is possible.
  • a synchronization channel transmission method comprising: generating one synchronization channel including a plurality of sub-synchronization channels; And multiplexing the plurality of sub-synchronous channels by any one of a time division multiplexing (TDM), a frequency division multiplexing (FDM), and a code division multiplexing (CDM) scheme.
  • TDM time division multiplexing
  • FDM frequency division multiplexing
  • CDM code division multiplexing
  • the subsymbols proposed in the embodiments of the present invention are not limited by whether they are defined in any particular region of the time domain or the frequency domain. That is, a signal defined in the time domain and converted into a frequency domain, or a signal defined in the frequency domain and converted to a time domain, may also be regarded as a signal in the final defined domain. That is, in the process of generating a multi-carrier symbol as described with reference to FIG. 1, the input data sequence may be interpreted either in the time domain or in the frequency domain, and thus is not limited by which specific domain is defined.
  • a method for transmitting a synchronization channel at a transmitting side in a wireless communication system using a multi-carrier according to the present invention is described. To this end, one multi-carrier symbol including two or more sub-synchronization channels is generated, and the generated multi-carrier symbol is transmitted to a receiver through the synchronization channel.
  • a method for generating a multi-carrier symbol for a synchronization channel at a transmitting side in a wireless communication system using the multi-carrier is described.
  • a subsymbol associated with a sub-sync channel corresponding to each of two or more data sequences including sync information is generated, and the sub-sync channel subsymbols are combined to generate one multicarrier symbol.
  • the sub-sync channel provides one or more of information on acquisition of time and frequency synchronization, information on antenna configuration, information on frequency bandwidth configuration, and information on cell ID.
  • the sub sync channel subsymbol is a subsymbol including information on synchronization and cell ID provided by the sub sync channel.
  • the subsymbols are combined in a TDM scheme when generating one multi-carrier symbol.
  • the subsymbols are combined in an FDM scheme.
  • the subsymbols are combined in a CDM scheme when generating one multicarrier symbol.
  • Second, complexity of a synchronization process may be reduced by allocating synchronization information for system synchronization and cell search to one or more sub-sync channels.
  • the at least one sub-synchronization channel to which the synchronization information is allocated is efficiently allocated by assigning the at least one sub-synchronization channel to radio resources for one multi-carrier symbol of a mobile communication system using a multi-carrier transmission scheme using various multiplexing schemes.
  • the radio resources can increase the data transmission efficiency.
  • FIG. 1 is a view showing a process of generating a signal using a multi-carrier in the transmitting side in the prior art
  • FIG. 2 illustrates an example of a method for generating a multicarrier symbol including two or more subsymbols combined by a TDM scheme proposed in an embodiment of the present invention
  • FIG. 3 is a diagram illustrating another example of a method for generating a multicarrier symbol according to an embodiment of the present invention
  • FIG. 4 is a diagram showing another example of a method for generating a multicarrier symbol according to another embodiment of the present invention.
  • FIG. 5 is a diagram illustrating an example of a method for generating a multicarrier symbol according to another embodiment of the present invention.
  • FIG. 6 is a diagram illustrating another example of a method for generating a multicarrier symbol according to another embodiment of the present invention.
  • FIG. 7 illustrates another example of a method for generating a multicarrier symbol according to another embodiment of the present invention.
  • FIG. 8 is a diagram showing an example of a method for generating a multicarrier symbol according to another embodiment of the present invention.
  • FIG. 9 is a view showing a frequency band search method of a terminal in an FDM scheme according to another embodiment of the present invention.
  • FIG. 10 is a diagram illustrating another example of a method for generating a multicarrier symbol according to another embodiment of the present invention.
  • FIG. 11 is a view showing another example of a method for generating a multicarrier symbol according to another embodiment of the present invention.
  • FIG. 12 is a diagram illustrating still another example of a method of generating a multicarrier symbol according to another embodiment of the present invention.
  • FIG. 13 illustrates an example of a method for generating a multicarrier symbol according to another embodiment of the present invention
  • FIG. 14 is a diagram showing another example of a method for generating a multicarrier symbol according to another embodiment of the present invention.
  • 15 is a diagram illustrating another example of a method for generating a multicarrier symbol according to another embodiment of the present invention.
  • 16 is a diagram showing another example of a method for generating a multicarrier symbol according to another embodiment of the present invention.
  • 17 is a diagram showing another example of a method for generating a multicarrier symbol according to another embodiment of the present invention.
  • FIG. 18 is a diagram illustrating still another example of a method of generating a multicarrier symbol according to another embodiment of the present invention.
  • FIG. 19 is a diagram showing another example of a method of generating a multicarrier symbol according to another embodiment of the present invention.
  • 20 is a diagram illustrating a method of generating a multicarrier symbol including subsymbols according to another embodiment of the present invention.
  • FIG. 21 is a diagram illustrating a method for generating a synchronization channel according to an embodiment of the present invention.
  • FIG. 22 illustrates a method for generating a synchronization channel according to another embodiment of the present invention.
  • FIG. 23 is a diagram illustrating a method of transmitting a synchronization channel proposed in another embodiment of the present invention.
  • Embodiments proposed in the present invention described below are applicable to a multi-carrier multiple access system considering mobile mobility of a terminal, for example, a mobile communication system using OFDM (hereinafter, referred to as an OFDM mobile communication system). It is also applicable to MC (Multi carrier) -CDMA, SC (Single carrier) -FDMA, Walsh-Hadamard (WH) -FDMS, and Discrete Fourier Transform (DFT) spread OFDMA.
  • MC Multi carrier
  • SC Single carrier
  • WH Walsh-Hadamard
  • DFT Discrete Fourier Transform
  • the present invention can also be applied to the IEEE 802.16e system and the IEEE 802.16m system, which are standards for OFDM mobile communication systems. [The related standard standards are IEEEStd 802.16e-2005 and http://www.ieee802.org/16/published. .html reference].
  • the invention is also applicable to other similar mobile communication systems, such as Evolved Universal Terrestrial Radio Access (E-UTRA), also called Long Term Evolution (LTE).
  • E-UTRA Evolved Universal Terrestrial Radio Access
  • LTE Long Term Evolution
  • the present invention may be applied to an IMT-A system such as LTE-A (Advanced).
  • the present invention can also be used in a variety of communication systems, including ways of using single antennas and multiple antennas.
  • a base station generally includes a network excluding a terminal in a communication system that includes not only a physical transmission end but also an upper layer as a fixed point for communicating with the terminal. Therefore, in the present invention, the network and the base station have the same meaning as symmetrical parts with the terminal.
  • the terminal may be fixed or mobile.
  • FIG. 2 is a diagram illustrating an example of a method for generating a multicarrier symbol including two or more subsymbols combined by a TDM scheme proposed in an embodiment of the present invention.
  • at least two or more subsymbols are combined, that is, multiplexed, in a TDM scheme in a time domain allocated to one symbol.
  • each subsymbol may be configured to be immediately adjacent to each other on the time domain or may be configured to be separated from each other.
  • the following is the definition of symbols to be used in this embodiment of multiplexing a subsymbol by the TDM scheme.
  • Tu Length of a multicarrier symbol carried on a control channel or a data channel in a conventional mobile communication system using a multicarrier.
  • Tcp Length of a cyclic prefix (CP) for a multicarrier symbol carried on a control channel or a data channel in a conventional mobile communication system using a multicarrier
  • Nsub number of subsymbols to be multiplexed in one multicarrier symbol
  • Tun Duration of the nth subsymbol included in one multicarrier symbol, Tun ⁇ 0.
  • Tcpn Length of CP of nth subsymbol included in one multicarrier symbol, Tcpnn ⁇ 0.
  • Two methods are available for multiplexing one or more subsymbols in a symbol using the TDM method.
  • the sum of the durations of the subsymbols corresponds to the sum of the durations of the conventional general multicarrier symbol and the CP and corresponds to Equation 2.
  • the conventional general multi-carrier symbol means a conventional multi-carrier symbol for transmitting control information or data, not a symbol including multiplexed subsymbols as in the present invention.
  • the sum of the durations of the subsymbols corresponds to the sum of the durations of the conventional general multicarrier symbols and corresponds to Equation 3.
  • FIG. 2 is a diagram illustrating an example of a method for generating a multi-carrier symbol to which the TDM scheme 1 is applied, among the methods for generating a multi-carrier symbol specifically proposed in an embodiment of the present invention.
  • Several subsymbols are multiplexed in a TDM scheme in one multicarrier symbol, and the sum of the total durations of the subsymbols including the CP coincides with the length of the multicarrier symbol for general data or control symbols.
  • the symbol duration Tun of the nth subsymbol of Equation 2 or Equation 3 or the CP duration Tcpn of the nth subsymbol may all have the same value, or may have different values.
  • each subsymbol is not necessarily a symbol for the same information, but may be a subsymbol that plays a different role for each subsymbol. That is, some subsymbols may be carried on a broadcast channel, a data channel, or a control channel including a synchronization channel.
  • the CP part can also be filled with zeros to use as a guard time.
  • one of each subsymbol following the CP may be selected to copy a specific portion of the subsymbol.
  • each subsymbol may be used by copying forward.
  • FIG. 3 is a diagram illustrating another example of a method for generating a multicarrier symbol using the TDM scheme 1 in the method for generating a multicarrier symbol proposed in an embodiment of the present invention.
  • each subsymbol is adjacent to each other without a CP.
  • all CPs are nulled or a specific part of another subsymbol. You may.
  • the last specific portion of the first subsymbol may be allocated to CP.
  • FIG. 4 is a diagram illustrating another example in which the TDM scheme 1 is applied to a multicarrier symbol generation method proposed in another embodiment of the present invention.
  • FIG. 5 is a diagram illustrating an example of a method for generating a multicarrier symbol using the TDM scheme 2 in the method for generating a multicarrier symbol proposed in another embodiment of the present invention.
  • several subsymbols are combined in the form of TDM, and the total duration of the subsymbols including the CP assigned to each subsymbol (in the case of FIG. 5, copying the last part of the corresponding subsymbol).
  • the length corresponding to the sum is equal to the length of the conventional general multicarrier symbol described above.
  • the content and length of the CP, the length of the subsymbol, and the information to be conveyed are the same as in the embodiment of FIG.
  • FIG. 6 is a diagram illustrating another example of a method for generating a multicarrier symbol using the TDM scheme 2 in the method for generating a multicarrier symbol proposed in another embodiment of the present invention.
  • each subchannel is adjacent to each other without a CP.
  • this CP is a CP copied from the (Nsub-1) th subsymbol, which is the last subsymbol.
  • the subsymbols to be copied by the CP need not be fixed to the subsymbols at any particular position and can be changed.
  • the CP is copied from the last specific portion of the first subsymbol.
  • FIG. 7 is a diagram illustrating another example of a method for generating a multicarrier symbol using the TDM scheme 2 in the method for generating a multicarrier symbol proposed in another embodiment of the present invention.
  • FIG. 8 is a diagram illustrating an example of a method for generating a multicarrier symbol using FDM among the methods for generating a multicarrier symbol proposed in another embodiment of the present invention.
  • at least two or more subsymbols are proposed in the FDM scheme in the frequency domain allocated to one symbol.
  • each subchannel may be configured to be immediately adjacent to each other on the frequency band or may be configured apart from each other.
  • the frequency band to which each subchannel is allocated may be allocated by a specific allocation rule.
  • the subchannels are allocated in a scaling factor scheme around a center frequency in a frequency band allocated to a symbol. The following is a definition of symbols to be used in the following embodiments.
  • ⁇ n scaling factor for the nth subchannel (0 ⁇ ⁇ n ⁇ 1)
  • the first subchannel is allocated to the intermediate frequency (DC carrier in FIG. 8) in the frequency band allocated to one multicarrier symbol, and the next subchannel is allocated one frequency section from the intermediate frequency to the left and right bands. Done.
  • one subchannel is divided into two parts by a scaling factor and allocated.
  • the nth subsymbol is allocated a frequency band of Bn, except for the first subchannel, one subchannel is divided by the scaling factor from side to side around the center frequency.
  • subchannel 1 corresponding to the second subchannel is divided into left and right subchannels 0 and a predetermined guard band around the center frequency.
  • subchannel 1 is allocated a total of B1 frequencies, of which subchannel 1 to the left of the center frequency is assigned a frequency of (1- ⁇ 1) B1 and subchannels to the right of the center frequency. 1 is assigned a frequency of? 1B1.
  • Other subchannels are allocated in the same manner.
  • FDM is allocated by subchannels in a scaling factor based on a center frequency
  • the UE moves between several base stations (especially when receiving services while moving between base stations of heterogeneous mobile communication systems).
  • the bandwidth for one symbol is variably allocated to each base station and system according to its operation, so that when the OFDM symbol is transmitted to the terminal, the terminal searches for a subchannel from a predetermined minimum frequency band based on the center frequency. Subsequently, the sub-channel can be searched by extending the frequency band by a predetermined unit to cope with the case where the frequency domain is variably allocated.
  • FIG. 9 is a diagram illustrating a frequency band searching method of a terminal in an FDM scheme proposed in another embodiment of the present invention.
  • the terminal when a frequency band is allocated to each symbol (or even one system) by 5 MHz, 10 MHz, or 20 MHz in one symbol, the terminal first searches for a 5 MHz band 910 around the center frequency. If the frequency band needs to be extended and searched, 10MHz (920) and 20MHz (930) are gradually enlarged and searched around the center frequency. This enables the terminal to efficiently receive data, thereby increasing the power efficiency of the terminal.
  • several adjacent carriers including a DC carrier corresponding to a center frequency, may be used as a guard band for DC offset protection.
  • FIG. 10 is a diagram illustrating another example of a method for generating a multicarrier symbol using FDM proposed in another embodiment of the present invention.
  • the remaining subchannels exist only on one side of the center frequency.
  • the odd-numbered subchannel eg, subchannel 1
  • the even-numbered subchannel eg, subchannel 2
  • FIG. 11 is a diagram illustrating another example of a method for generating a multicarrier symbol using FDM proposed in another embodiment of the present invention.
  • even subchannels including subchannel 0 are allocated to the right of the center frequency and odd subchannels are allocated to the left of the center frequency. The location assignment of such a subchannel can be reversed.
  • Subchannel 0 and subchannel 1 shown in FIG. 11 may or may not be distinguished by only one DC carrier or two or more DC carriers.
  • FIG. 12 is a diagram illustrating another example of a method for generating a multicarrier symbol using FDM proposed in another embodiment of the present invention.
  • the present embodiment is similar to the case of FIG. 8, but only a guard band between subchannels. There is no difference in this. At this time, there may or may not be a DC carrier corresponding to the center frequency, which is determined by the system operating situation.
  • FIG. 13 is a diagram illustrating an example of a method for generating a multicarrier symbol using a CDM proposed in another embodiment of the present invention.
  • two or more subsymbols are multiplexed in the CDM scheme in the time domain allocated to one symbol.
  • each subsymbol is assigned a sequence defined in the time domain, and the sequences are multiplexed by the CDM method.
  • sequence such as a random sequence, a PN code, a Golay sequence, a CAZAC sequence (Zadoff-Chu, modulated Frank, GCL, etc.) may be used.
  • a multicarrier symbol is generated by a CDM method in which subchannels are added to each other at the same power ratio.
  • This embodiment is applicable to the case where CP is added to each subsymbol or when CP is not added.
  • each subchannel may be allocated at a different power ratio according to importance. This may be implemented by repeatedly generating important subchannels.
  • FIGS. 14 and 15 are embodiments for such a case.
  • FIG. 14 is a diagram illustrating another example of a method for generating a multicarrier symbol using a CDM proposed in another embodiment of the present invention.
  • subchannel 0 is repeated twice in one multicarrier symbol interval, and subchannel 1 is repeated three times.
  • Subchannels may be masked with PN code chips to implement repetition in a certain period. Through repeated assignment of subchannels, a multicarrier symbol may be generated by reflecting a difference in importance between subchannels.
  • FIG. 15 is a diagram illustrating another example of a method for generating a multicarrier symbol using a CDM proposed in another embodiment of the present invention.
  • 15 illustrates a case where CDM and TDM are simultaneously applied.
  • Subchannel 0 is repeated twice, and subchannels 1 through 3 are combined by TDM and they are combined by CDM.
  • multi-carrier symbols can be generated by reflecting the importance of the subchannels and the amount of available resources according to the operation of the system.
  • FIG. 16 is a diagram illustrating another example of a method for generating a multicarrier symbol using a CDM proposed in another embodiment of the present invention.
  • the previous CDM scheme constructs a multicarrier symbol by sub-channels sum of element-by-elements, but in the following embodiments, multi-carrier symbols are constructed by multiplying element-to-element between subchannels. It is defined that scrambling a product of an element versus an element among such subchannels. Scrambling in the following embodiments can be performed in the time domain and the frequency domain.
  • FIGS. 14 to 15 a method of allocating different power ratios between subsymbols or simultaneously applying the TDM is possible.
  • the following embodiments show such a case.
  • FIG. 17 is a diagram illustrating another example of a method for generating a multicarrier symbol using a CDM proposed in another embodiment of the present invention. As shown in FIG. 17, scrambling may be performed by configuring different power ratios between subchannels according to their importance.
  • FIG. 18 is a diagram illustrating another example of a method for generating a multicarrier symbol using a CDM proposed in another embodiment of the present invention.
  • the subchannels may be configured with different power ratios according to their importance, and the scrambling may be performed by using a TDM scheme.
  • FIG. 19 is a diagram illustrating another example of a method of generating a multicarrier symbol using a CDM proposed in another embodiment of the present invention.
  • FIG. 19 unlike in FIGS. 16 to 18, scrambling is performed between subchannels in a frequency domain rather than a time domain. In this case, application of the same method as in FIGS. 17 and 18 is also possible.
  • First input data sequence Is input to the segmentation unit 210.
  • the fragmentation unit 210 fragments the input data sequence into t data blocks determined by the system in predetermined units.
  • the input data sequence may be a plurality of fragmented input data sequences from the beginning.
  • the fragmentation unit is not necessary, but in the present embodiment, it is assumed that there is a fragmentation unit that fragments the input data sequence.
  • Each of these fragmented data blocks is input to respective subsymbol generators 220-1, 220-2, ..., 220-t.
  • the subsymbol generator includes a parallel-serial converter and an IFFT unit as in the multi-carrier symbol generator shown in FIG. 1.
  • Each subsymbol generated by the subsymbol generator is input to the combiner 230 to generate one multi-carrier symbol.
  • each subsymbol generator generates a cyclic prefix if necessary for each of the generated subsymbols.
  • the combiner 230 multiplexes the input subsymbols according to the embodiments of the present invention proposed in FIGS. 2 to 19.
  • One multi-carrier symbol generated by the combiner 230 is transmitted on the radio channel via the RF unit 240.
  • FIGS. 2 to 19 are applied to the generation of a synchronization channel in a mobile communication system using a multicarrier.
  • the process of acquiring synchronization with the base station by the terminal may be divided into frequency and time synchronization and cell ID acquisition of the base station. It is not efficient in terms of complexity and radio resource management that the base station and the terminal perform all of these processes in one synchronization channel.
  • the process is performed in a plurality of steps for the synchronization acquisition process and the control information necessary for each step is allocated to the subsymbol. Do it.
  • This sub sync channel is a channel for transmitting a subsymbol containing sync related control information.
  • a certain sub sync channel x corresponds to a subsymbol to which cell ID information is assigned, and another sub sync channel y is a cell group.
  • ID information corresponds to the assigned subsymbol is mentioned.
  • the terminal first obtains cell ID information of the current base station from sub-sync channel x and obtains cell group ID information (or partial cell ID information) through sub-sync channel y. Using these two informations, the UE can structurally obtain cell ID information and cell group ID information.
  • the sub sync channel x and the sub sync channel are assigned.
  • the sub-sync channel includes information on antenna configuration (information on the number of antennas used in a sync channel or another channel), bandwidth allocation information, CP configuration information, various modes information, and MIMO operation method.
  • the assigned subsymbols may correspond.
  • the sub-synchronous channel 0 corresponds to the sub-symbol for time and frequency synchronization-related information
  • the sub-synchronous channel 1 Corresponds to a subsymbol for cell ID classification related information
  • sub sync channel 2 corresponds to a subsymbol for cell group ID related information
  • sub sync channel 3 corresponds to a subsymbol for antenna configuration related information
  • Sync channel 4 may correspond to a subsymbol for bandwidth configuration related information.
  • the sub-sync channel corresponding to each subsymbol When the synchronization related information is transmitted through the sub-sync channel corresponding to each subsymbol using two or more subsymbols, the sub-sync channel corresponding to each subsymbol as in the embodiments proposed in FIGS. 2 to 19.
  • the sub-sync channel corresponding to each subsymbol as in the embodiments proposed in FIGS. 2 to 19.
  • the multi-carrier symbol generated as described above is transmitted to the receiver through a synchronization channel, time diversity, frequency diversity, and code diversity effects may be obtained in transmission, and power ratios for each sub-sync channel may vary depending on importance.
  • the synchronization channel may be transmitted.
  • a guard interval guard time, guard frequency band, etc.
  • CP CP for each sub-sync channel
  • multi-carrier symbol transmission can be performed under the influence of channel distortion due to interference and multipath.
  • a method of multiplexing and simultaneously transmitting sub-synchronous channels corresponding to subsymbols corresponding to system information or emergency message information and sub-synchronous channels corresponding to subsymbols related to the above synchronization information may be simultaneously transmitted.
  • 21 and 22 illustrate a method of generating a synchronization channel proposed in an embodiment of the present invention.
  • the embodiment of FIG. 21 relates to generating by using the method proposed in the embodiment of FIG. 2 in generating a synchronization channel using the above-described sub-sync channel. More specifically, the present invention relates to a method of using two subsymbols having the same length.
  • the synchronization channel may include time and frequency synchronization acquisition related information, cell ID classification related information, cell group ID related information, antenna configuration related information, and frequency bandwidth configuration related information.
  • the synchronization channel related information may be allocated to symbol 0 and subsymbol 1.
  • time and frequency synchronization acquisition related information may be allocated to subsymbol 0
  • remaining synchronization channel related information may be allocated to subsymbol 1.
  • the embodiment of FIG. 22 relates to generating by using the method proposed in the embodiment of FIG. 5 in generating a synchronization channel using the above-described sub-sync channel. More specifically, the present invention relates to a method of using two subsymbols having the same length. A specific subsymbol allocation method may use the method proposed in the embodiment of FIG. 21.
  • the two subsymbols according to the embodiments of FIGS. 21 and 22 have the same length and include synchronization channel related information, but may have different lengths, and other information other than the synchronization channel related information (for example, broadcast Cast related information, data channel related information, etc.). Alternatively, the synchronization channel related information and the other information may be allocated to different subsymbols.
  • 23 shows a method of transmitting a synchronization channel proposed in another embodiment of the present invention.
  • 23 illustrates a method of allocating two or more sub-sync channels for transmitting a sync channel according to the present invention in an IEEE 802.16m system.
  • FIG. 23 shows the position within a super-frame of a synchronization channel of IEEE 802.16m.
  • the frame structure of IEEE 802.16m may be configured using four frames as one superframe and eight subframes as one frame.
  • Each super frame may include control information called a super-frame header (SFH).
  • FSH super-frame header
  • Each sync channel in a frame may consist of one OFDM symbol, which is an example of a multicarrier scheme.
  • Each OFDM symbol may be composed of two or more subsymbols proposed in the embodiments of FIGS. 2 to 19 of the present invention, and each subsymbol may be allocated a sub sync channel shown in FIGS. 21 to 22.
  • an OFDM symbol for initial synchronization and cell information or an additional synchronization-related OFDM symbol for synchronization and cell information at handover may be configured in a hierarchical structure in which every frame exists. It may also be transmitted in a non-hierarchical structure.
  • the present invention may be applied to enable interworking with the conventional IEEE 802.16e system.
  • synchronization related information is transmitted to a preamble and a synchronization channel is repeated on a time axis.
  • a synchronization pattern appears on the time axis.
  • the signal for the synchronization channel may be loaded at each specific position of the carrier.
  • the sync channel is composed of two or more sub-sync channels, and the characteristics of each sub-sync channel have been described above with reference to FIGS. 21 to 22.
  • the synchronization channels of IEEE 802.16m are different from those of IEEE 802.16e to avoid collision with the IEEE 802.16e preamble signal. It can be transmitted so as to have a repeating pattern postmarked with each other.
  • the transmitting side may be a terminal or a base station of a network
  • the receiving side may be a base station or a terminal of a network.
  • the terminology used herein may be replaced with other terms having the same meaning.
  • a terminal may be replaced with a mobile station, mobile terminal, communication terminal, user equipment or device, and the like
  • a base station may be replaced with terms such as a fixed station, a Node B (NB), an eNB, and the like.
  • the data generation and synchronization channel transmission method in the multi-carrier multiple access communication system according to the present invention can be used industrially.

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  • Computer Networks & Wireless Communication (AREA)
  • Signal Processing (AREA)
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Abstract

L'invention concerne un procédé de transmission de canal de synchronisation depuis un émetteur, dans un système de communications sans fil utilisant une porteuse multiple, qui comprend les étapes suivantes: production de symbole de porteuse multiple ayant au moins deux canaux de synchronisation secondaire, et transmission de ce symbole vers un récepteur via les canaux de synchronisation secondaire. Selon ce procédé, l'émetteur est en mesure d'augmenter le débit de transmission de données d'un canal de synchronisation par une utilisation efficace des ressources sans fil.
PCT/KR2009/001211 2007-12-17 2009-03-11 Procédé de production de données et de transmission de canal de synchronisation dans un système de communications mobiles Ceased WO2009113807A2 (fr)

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US3572108P 2008-03-11 2008-03-11
US61/035,721 2008-03-11
KR1020080069667A KR101430486B1 (ko) 2007-12-17 2008-07-17 이동 통신 시스템에서의 데이터 생성 및 전송 방법
KR10-2008-0069667 2008-07-17

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US20090046701A1 (en) * 2006-01-13 2009-02-19 Matsushita Electric Industrial Co., Ltd. Radio communication base station apparatus and synchronization channel signal transmission method
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