WO2016104819A1 - Procédé de transmission de signal pour la répartition au hasard des interférences entre cellules dans un système de communication sans fil prenant en charge un schéma mimo, et dispositif pour cela - Google Patents

Procédé de transmission de signal pour la répartition au hasard des interférences entre cellules dans un système de communication sans fil prenant en charge un schéma mimo, et dispositif pour cela Download PDF

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Publication number
WO2016104819A1
WO2016104819A1 PCT/KR2014/012629 KR2014012629W WO2016104819A1 WO 2016104819 A1 WO2016104819 A1 WO 2016104819A1 KR 2014012629 W KR2014012629 W KR 2014012629W WO 2016104819 A1 WO2016104819 A1 WO 2016104819A1
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Prior art keywords
interference randomization
pattern
signal
layers
transmission
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PCT/KR2014/012629
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English (en)
Korean (ko)
Inventor
박경민
조희정
고현수
최혜영
변일무
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엘지전자 주식회사
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Priority to PCT/KR2014/012629 priority Critical patent/WO2016104819A1/fr
Publication of WO2016104819A1 publication Critical patent/WO2016104819A1/fr

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    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04B—TRANSMISSION
    • H04B7/00—Radio transmission systems, i.e. using radiation field
    • H04B7/02—Diversity systems; Multi-antenna system, i.e. transmission or reception using multiple antennas
    • H04B7/04—Diversity systems; Multi-antenna system, i.e. transmission or reception using multiple antennas using two or more spaced independent antennas

Definitions

  • the present invention relates to a wireless communication system, and more particularly, to a method and apparatus for transmitting a signal for inter-cell interference randomization in a wireless communication system supporting the MIM0 scheme.
  • MIMO multi-input
  • MIMO Mult i-Input Mult i-Output
  • MIMO uses a plurality of transmission antennas and a plurality of reception antennas at each of a transmitting end and a receiving end when transmitting and receiving data.
  • the capacity can be increased to improve the efficiency of data transmission and reception.
  • a wireless communication system supporting such a MIM0 scheme does not rely on a single antenna path to transmit and receive one entire message, but instead transmits each data fragment through multiple antenna paths, and receives each received By gathering and merging pieces of data, you complete the data, a whole message.
  • the terminal may be affected by an interference signal from an adjacent cell, thereby causing severe performance degradation, and interfering to solve such interference problem.
  • Transmitting / receiving methods such as an interference randomization (IR) transmission method, have been developed.
  • IR interference randomization
  • an interference randomization (IR) technique is required to support the operation of a high SIR region terminal, and the interference randomization (IR) technique operates in a situation where a channel coding gain is small. Since there is a limit to the situation, there is a demand for a solution to overcome this.
  • the technical problem to be achieved in the present invention is to provide a method for transmitting a signal for inter-cell interference randomization in a wireless communication system supporting the MIM0 scheme.
  • Another technical problem to be achieved in the present invention is to provide a method for enhancing the gain of interference randomization (IR) in a wireless communication system supporting the MIM0 scheme.
  • IR interference randomization
  • Another object of the present invention is to provide a method of designing a pattern having a large gain of interference randomization (IR) in a wireless communication system supporting the MIM0 scheme.
  • IR interference randomization
  • Another technical problem to be achieved in the present invention is to provide a method for transmitting a large pattern (Pattern) designed in a wireless communication system supporting a MIM0 scheme to a multi-tank (Mul t i -RANK).
  • Another technical problem to be achieved in the present invention is to provide an apparatus for supporting the above-described methods.
  • Interference randomization between cells in a transmitting end in a wireless communication system supporting a MIMO (Mul t iple Input Mul t iple Output) method according to an embodiment of the present invention for solving the above problems IR) is a method for transmitting a signal, by splitting the transmission signal to be transmitted through the first layer among the N layers supported by the MIM0 into N, the number of layers, respectively, different spreading codes (Spreading Code) Applying the different spreading codes And applying an IR pattern to each of the spread N transmission signals and precoding the N transmission signals to which the interference randomization pattern is applied, and transmitting them to a receiver.
  • the interference randomization pattern is performed by repeating each of one or more symbols in the transmission signal M times, and M may be an integer greater than two.
  • the length of the interference randomization pattern is determined through the following equation, M ⁇ M, + (M, -I) 2 ⁇ , wherein M, may be a result of dividing M by N.
  • the pre-coding is one of N transmission signals to which the interference randomization pattern is applied This can be done after being converted to a stream.
  • the number of transmission signals to be transmitted through a second layer among the N layers may further include applying each of different spreading codes by dividing N into N, wherein the interference randomization pattern includes a part of the spread N transmission signals of the first layer and the spread of the second layer.
  • the interference randomization pattern may be alternately applied to each other by using a portion of N transmission signals.
  • a different interference randomization pattern is applied to each of the N layers,
  • code division is performed on one or more symbols of each of the N layers.
  • the number of symbols for which code division is performed in each of the N layers may be greater than a 0CC length value of each of the N layers.
  • a method for the inventors MIM0 system transmits a signal for interference randomization between cells in the transmitting side radio communication system supporting the transmission of the transmission signal (de-spreading the first despreading at the receiving end If the number of symbols for which code division is performed is larger than the 0CC length value, the first despreading may be performed in a group unit in which one or more symbols are combined.
  • the first despread transmission signal is the channel compensation (Channel Compensat ion) at the receiving end
  • the second despreading can be performed after).
  • the interference randomization pattern is Including a sub-interference randomization pattern
  • the sub-interference randomization pattern may be an interference randomization pattern having a minimum length.
  • RF unit including a transmitter and a receiver; And a processor connected to the transmitter and the receiver to support communication of the device, wherein the processor transmits a transmission signal to be transmitted through a first layer among the N layers supported by the MIM0, wherein N is the number of layers.
  • the N transmitted signals are precoded and controlled to be transmitted to a receiving end, and the interference randomization pattern is determined by the transmission signal. In one or each of the symbol is repeated M times is made on the M is an integer greater than 2 can be.
  • the length of the interference randomization pattern is determined by the following equation M ⁇ M, + (M, -1) 2 ⁇ , M may be a result of dividing M by the N.
  • the processor is pre-coding after the N transmission signals to which the interference randomization pattern is applied is converted into one stream (Stream) It can be controlled to perform.
  • the processor further includes a processor configured to transmit a signal through a second layer of the N layers.
  • the spreading signals to be transmitted are divided into N, which is the number of the layers, and different spreading codes are applied, and the interference randomization pattern is divided into a portion of the spread N transmission signals of the first layer and the second layer. Some of the spread N transmit signals can be used to control the mutual application.
  • the processor applies a different interference randomization pattern for each of the N layers, the different interference randomization pattern is applied In this case, it may be controlled to apply different OCCCOrthogonal Cover Sequences to each of the N layers.
  • the processor is controlled to perform code division (Code Division) for one or more symbols of each of the N layers, the N
  • the number of symbols for which code division is performed in each of the N layers may be greater than a 0CC length value of each of the N layers.
  • the transmitted signal is a symbol that is subjected to first despreading at the receiving end, and wherein the code division is performed.
  • the first despreading may be performed in a group unit in which one or more symbols are combined.
  • the first despread transmission signal is a second despreading after the channel compensation (Channel Compensat ion) is performed at the receiving end Can be.
  • the interference randomization pattern includes a sub-interference randomization pattern, the sub-interference randomization pattern has an interference randomization having a minimum length It may be a pattern.
  • a method may be provided in a wireless communication system supporting a MIM0 scheme.
  • a gain g a i n of interference randomization may be enhanced in a wireless communication system supporting the MIM0 scheme.
  • a method of designing a pattern having a large gain of interference randomization (IR) in a wireless communication system supporting a MIM0 scheme may be provided.
  • a large pattern designed in a wireless communication system supporting the MIM0 scheme may be transmitted to a multiple tank (Mult i-RANK).
  • FIG. 1 is a diagram illustrating a general wireless communication system.
  • FIG. 2 is a diagram illustrating a wireless communication system supporting the MIM0 scheme.
  • 3 is a diagram illustrating a channel from NT transmit antennas to receive antennas i in a wireless communication system supporting the MIM0 scheme.
  • FIG. 4 is a diagram for describing a degree of gain of an interference randomization (IR) transmission method according to a position of a terminal in a cell.
  • IR interference randomization
  • IR interference randomization
  • FIG. 6 is a view for explaining the concept of a multi-layer interference randomization pattern (Mult i-Layer IR Pattern) according to an embodiment of the present invention.
  • FIG. 7 is a diagram for illustrating an operation of a multi-layer interference randomization pattern (Mul t i -Layer IR Pattern) at a transmitting end.
  • Mul t i -Layer IR Pattern multi-layer interference randomization pattern
  • FIG. 8 is a diagram for illustrating another operation of a multi-layer interference randomization pattern (Mul t i -Layer IR Pattern) at the transmitting end.
  • Mul t i -Layer IR Pattern multi-layer interference randomization pattern
  • FIG. 9 is a diagram for describing a process of processing an interference randomization pattern at a receiving end.
  • FIG. 10 is a diagram for describing a process of processing an interference randomization pattern at a transmitting end and a receiving end.
  • 11 is a diagram for explaining the concept of a sub-interference randomization pattern.
  • FIG. 12 is a diagram illustrating an apparatus for transmitting a signal for inter-sal interference randomization according to an embodiment of the present invention.
  • the wireless communication technology is a 3GPP LTE, LTE-A, WIMAX or WiFi system, except for the specifics of 3GPP LTE, LTE-A, WIMAX or WiFi. It is possible to apply to any other wireless communication technology.
  • ... unit described in the specification means a unit for processing at least one function or operation, which may be implemented in hardware or software or a combination of hardware and software.
  • "a” or “an”, and “one”, and the like shall be, in the context of describing the present invention, both singular and plural unless the context clearly dictates otherwise or is clearly contradicted by the context. It can be used as a meaning including.
  • certain terms used in the embodiments of the present invention are provided to aid the understanding of the present invention, and unless otherwise defined, all terms used herein, including technical or scientific terms, The present invention has the same meaning as commonly understood by those skilled in the art. The use of this specific terminology may be modified in other forms without departing from the spirit of the invention.
  • first, second, etc. may be used to describe various components, but the components should not be limited by the terms. The terms are used only for the purpose of distinguishing one component from another component.
  • first component may be referred to as the second component, and similarly, the second component may also be referred to as the first component.
  • FIG. 1 is a diagram illustrating a general wireless communication system.
  • a general wireless communication system may include a user equipment (UE) (100a, 100b) and a base station (BS) 200.
  • UE user equipment
  • BS base station
  • the terminal (100a, 100b) is a user equipment (User Equipment), Terminal (Terminal), MS (Mobile Station), MSSCMobile Subscriber Station (SSCSubscriber Station), AMS (Advanced Mobile Station), WT ( The term "mobile terminal”, “machine-type communication” (MTC) device, “machine-to-machine” device, or “device-to-device” device. .
  • MTC machine-type communication
  • the base station 200 has a meaning as a terminal node of a network that directly communicates with the terminals 100a and 100b.
  • the base station 200 may be replaced by terms such as a fixed station, a Node B and an eNode B (eNB).
  • the base station 200 may be connected to communicate directly with the terminal (100a, 100b), where the connection is the terminal (100a, 100b) and the base station 200 is a message or Means that the information request and response is in a state capable of transmitting and receiving, and the connection means between the terminal (100a, 100b) and the base station 200 may include both radio or infrared communication means.
  • FIG. 2 is a diagram illustrating a wireless communication system supporting the MIM0 scheme.
  • MIM0 Multi-Input Multi-Output
  • NT transmitting antennas are provided at the transmitting end, and NR receiving antennas are installed at the receiving end.
  • NR receiving antennas are installed at the receiving end.
  • both the transmitter and the receiver In the case of using the antenna, the theoretical channel transmission capacity (channel transmi ss i on capaci ty) is increased than in the case of using a plurality of antennas in only one of the transmitting end and the receiving end.
  • the increase in the channel transmission capacity is proportional to the number of antennas, when the number of antennas is increased, the transmission rate is improved and the frequency efficiency is improved. If the maximum transmission rate in the case of using one antenna is Ro, the transmission rate in the case of using multiple antennas can theoretically be increased by multiplying the rate of increase rate Ri by the above Ro.
  • a transmission rate of four times may be obtained in theory compared to a single antenna system.
  • Multi-antenna technology simultaneously transmitting a plurality of data symbols using a spatial diversity (spat i al divers i ty) scheme and a plurality of transmit antennas to increase the transmission reliability by using the symbols passed through the various channel paths It can be divided into a spatial multiplexing method which improves the transmission rate. You can also combine these two approaches properly to get the benefits of each.
  • Equation 1 the maximum tank Ri of the channel matrix is given by Equation 1.
  • the maximum transmittable information is NT, so this can be represented by a vector as shown in Equation 2 below.
  • the transmission power may be different in each transmission information ⁇ , where each transmission power
  • the transmission information whose transmission power is adjusted may be represented by a vector such as Equation 3.
  • [008] can also be expressed as the equation (4) in the diagonal matrix P of the transmission power.
  • ⁇ may be configured by applying a weight matrix (W) to the information vector whose transmission power is adjusted.
  • W weight matrix
  • the augmentation matrix plays a role of appropriately distributing transmission information to each antenna according to a transmission channel situation.
  • Such a transmission signal 2 '' ⁇ is represented by a vector X, X can be represented as shown in Equation 5.
  • the signal vector x will be represented as follows.
  • wi j denotes a weight of the j th information ⁇ transmitted through the i th transmission antenna and is indicated by a matrix W.
  • W is referred to as a weight matrix ix or a precoding matrix ix.
  • the above-described transmission signal x can be considered divided into the case of using the spatial diversity and the case of using the spatial multiplexing.
  • a method of combining spatial multiplexing and spatial diversity is also contemplated. That is, for example, a case may be considered in which the same signal is transmitted by using spatial diversity through some transmission antennas, and spatially multiplexed by different signals through the remaining transmission antennas.
  • the reception signals yx, ⁇ ' -, y R of each antenna may be expressed as a vector as in Equation 6 .
  • a channel may be distinguished according to a transmit / receive antenna index, and a channel formed between a transmit antenna j and a receive antenna I may be represented by hi j.
  • the order of the index of hi j is that the receiving antenna index is first, and the index of the transmitting antenna is later.
  • FIG. 3 is a diagram illustrating channels from NT transmit antennas to receive antennas i in a wireless communication system supporting the MIM0 scheme.
  • Equation 7 a channel arriving from the total NT transmit antennas to the reception antenna i may be expressed as Equation 7.
  • Equation 8 may be expressed.
  • the actual channel goes through the channel matrix H as described above after white noise (AWGN;
  • the received signal may be expressed as Equation 10 using the equations modeled as above.
  • the number of columns is determined by the number of transmit and receive antennas. As the channel matrix H is seen earlier, the number of rows is equal to the number of receive antennas NR, and the number of columns is equal to the number NT of transmit antennas. In other words, the channel matrix H becomes an NR * NT matrix.
  • the rank of a matrix is independent of each other
  • Equation (11) It is defined as the minimum number of rows or columns. Thus, the tank of the matrix cannot be larger than the number of rows or columns. For example, rank (H) of the channel matrix H is limited as in Equation (11).
  • 3 ⁇ 4 may be defined as the number of eigenvalues other than zero among eigen values.
  • SVEKsingular value decomposition of a tank it can be defined as the number of nonzero singular values, so the physical meaning of the rank of the channel matrix can send different information in a given channel. It can be said to be the maximum number.
  • Each of the different information sent using the multi-antenna technology will be defined as 'transmission stream (Stream)' or simply 'stream'.
  • the 'stream' may also be referred to as a 'layer'.
  • the number of transport streams can then, of course, be no greater than the rank of the channel, which is the maximum number of different information that can be sent.
  • Equation 12 Equation 12 in the channel matrix.
  • FIG. 4 is a view for explaining the degree of gain (gain) of the interference randomization (IR) transmission method according to the position of the terminal in the cell.
  • a wireless communication system supporting the MIM0 scheme includes a base station 100, a terminal 200 in a high SIR region, a terminal 300 in a low SIR region, and a mobile cell 400.
  • a base station 100 a terminal 100 in a high SIR region
  • a terminal 300 in a low SIR region a terminal 300 in a low SIR region
  • a mobile cell 400 a mobile cell 400.
  • one or more base stations, terminals in a high SIR region, terminals in a low SIR region, and mobile cells may be included.
  • the wireless communication system may be affected by the interference signal from the neighboring cell, thereby causing severe performance degradation.
  • the terminal 300 in a low signal-to-interference ratio (SIR) region such as a cell boundary uses interference randomization (IR) technology
  • SIR signal-to-interference ratio
  • IR interference randomization
  • ICI inter-cell interference
  • IR interference randomization
  • MCS Modulation and Coding Schemes
  • the present invention overcomes the frequency selectivity problem by designing a pattern having a large gain of interference randomization but transmitting the designed pattern through a multi tank (Mul t i Rank).
  • FIG. 5 is a diagram for explaining gain increase of interference randomization (IR) according to the number of repetitive transmissions.
  • the pattern of interference randomization having a large gain is that the interference randomization transmission method is implemented by repeating the same pattern for a symbol.
  • the patterns are applied in units of M, the patterns are applied from symbols 1 to M. , And apply the pattern from Deep M + 1 to 2M.
  • the pattern generation method may be expressed in a closed form.
  • each symbol is repeatedly transmitted 2n times, and 2n symbols may be simultaneously transmitted in each layer through code spreading.
  • the terminal 200 may receive a signal transmitted from the base station 100 (hereinafter, referred to as a reception signal) and simultaneously transmit from the mobile cell 300.
  • An interference signal (hereinafter referred to as an interference signal) that interferes with the base station signal may be received.
  • each code spreading the received signal al to made up of symbols of a6 and a group of six symbols which are transmitted respectively repeated twice, al and a2, a 3 and a4 and a5 and a6 is applied in Two symbols are simultaneously transmitted from each base station 100 through each layer.
  • the interference signal is also composed of the symbols of bl to b6, each is repeatedly transmitted twice, code spread is applied to each of bl and b2, b3 and b4 and b5 and 6 so that two symbols move 300 Are transmitted simultaneously through each layer (l ayer).
  • the gain of the interference randomization may be greater if the number of symbol repetitive transmissions of the signals is increased.
  • the UE may obtain a larger gain of interference randomization than the case of repeatedly transmitting twice.
  • any of b2, b4, b6, ... (4 or more) of the N symbols of bl to bN of the interference signal received at the terminal with al to aN N symbols of the received signal Even if any one of the symbols and phase / amplitude of the received signal is different, the terminal may obtain a larger gain of interference randomization than when repeated transmissions are performed twice.
  • FIG. 6 is a view for explaining the concept of a multi-layer interference randomization pattern (Mult i-Layer IR Pattern) according to an embodiment of the present invention.
  • Mult i-Layer IR Pattern multi-layer interference randomization pattern
  • the interference randomization gain may not be guaranteed.
  • the size of the interference randomization pattern is greatly increased in order to prevent the effect of the symbol interference randomization is reduced, in which case the size of the interference randomization pattern becomes very large, so that the same symbol is mapped between resources.
  • the maximum distance increases very much.
  • the frequency selectivity (Frequency select ivi ty) is sensitive, and may also cause a problem that the constraint on short packet transmission support (short packet). If symbol repetition is performed M times, the minimum length of the interference randomization pattern may be obtained through the following equation.
  • the minimum length of the interference randomization pattern is 6, and when the symbol repetition is performed 4 times and M is 4, the minimum length of the interference randomization pattern is 52, and the symbol repetition is performed six times, so that the minimum length when M is 6 is 186.
  • the length of the interference randomization pattern may be close to the maximum interference randomization pattern length.
  • the present invention proposes a concept of a multi-layer interference randomization pattern (Mul t i -Layer IR Pattern) as shown in FIG.
  • the interference randomization pattern of each symbol is defined in at least two layers (Layer), respectively, in Figure 6 for the convenience of explanation of each symbol It is assumed that interference randomization patterns are defined in two layers (Layer 1 and Layer 2), respectively.
  • Repeated transmission 2m times may be implemented as two repeated transmissions for each layer.
  • each symbol is sent to a different stream using different interference randomization patterns, and eventually P-to-s (Paral lel) -to-ser ial) turns it into a stream and then precodes it.
  • the length of the interference randomization pattern may be reduced, which may be reduced in proportion to the number of layers.
  • the minimum length of the interference randomization pattern may be calculated based on Equation 12, but in the case of the multilayer interference randomization pattern, the minimum length of the interference randomization pattern is represented by the following equation. It is available through.
  • ⁇ may be determined as a value (M / L) obtained by dividing the number of symbol repetitions by the number of layers.
  • the minimum length of the original interference randomization pattern is 52, but in the case of the multilayer interference randomization pattern, the minimum length of the interference randomization pattern is 12 So that the length of the interference randomization pattern can be reduced,
  • IR Pat is a diagram for illustrating the operation of. Referring to FIG. 7, the operation of the multi-layer interference randomization pattern, that is, the operation is performed in common for each cell among the four operations of the 4 times repeated interference randomization transmission when the rank is 2, the spreading code in each layer The initial action is shown after each application is sent to different streams.
  • layer 1 includes 1, 3, 5, 7, 9,... Symbol 2
  • layer 2 contains 2, 4, 6, 8, 10,... It is assumed that the symbol of is included.
  • each symbol in the layer 1 and the layer 2 is applied to each S-t P (Ser i a to-Paral lel) after the spreading code is applied.
  • the symbols of the layer 1 and the layer 2 are mixed with each other, that is, the layer reset process is performed, respectively, and the layer 1 undergoes the layer reset process is the first symbol 1 and the symbol 3 'as shown in FIG.
  • the two symbols are maintained as they are, and the two subsequent symbols may include a symbol of the layer 2, that is, a symbol 2 and a symbol 4.
  • symbol 3 may be included, followed by two symbols including layer 2 symbols, that is, symbol 2 and symbol 4.
  • FIG. 8 is a diagram for illustrating another operation of a multi-layer interference randomization pattern (Mul ti -Layer IR Pattern) at the transmitting end.
  • the operation of the multilayer interference randomization pattern that is, if the rank is 2, the cell randomization (Cel l-Speci f ic) interference randomization pattern during the entire operation of the four times the repeated interference randomization transmission
  • the cell randomization (Cel l-Speci f ic) interference randomization pattern As an operation to be applied, an operation in which an interference randomization pattern is applied to each layer to which a spreading code is applied is shown.
  • layer 1 and layer 2 may be included, and all of them may be referred to as one interference randomization pattern.
  • cell B different patterns may be used to achieve interference randomization with cell A. Since cyclic shift (Cycl ic shi ft) method is used.
  • each symbol may be positioned differently through the above process, and in the case of applying the cyclic shift scheme, each of the offset values may be the largest gain. ) Can be obtained.
  • 9 is a diagram for describing a process of processing an interference randomization pattern at a receiving end.
  • the signal of the cell A is a signal received from the base station to the terminal to receive
  • the signal of Sal B means the interference signal for the received signal of the cell A.
  • the channel compensation and the channel restoration process are performed, and after the channel compensation and layer restoration process, the decoding randomization effect can be obtained.
  • the symbols of the layer 1 and the layer 2 of each of the cells A and B are subjected to two interference randomization processes and the first interference randomness.
  • the effect of interference randomization between four symbols is maximized. do.
  • FIG. 10 is a diagram for describing a process of processing an interference randomization pattern at a transmitting end and a receiving end.
  • a transmitting end maps a codeword to a layer, and then performs a layer scramble process after spreading for each layer.
  • the same symbol is repeatedly transmitted to a plurality of layers, and different 0CC (0rthogonal Cover Sequence) may be applied to each layer when repeatedly transmitting to each layer.
  • Code division may be performed.
  • the number of code division symbols performed in each layer may be longer than the length of 0CC of each layer.
  • the interference randomization pattern is applied to each layer, and then the preprocessing is completed by performing the precoding.
  • the receiving end receives the precoded signal for each channel (that is, for each beam), and goes through a de-spreading process for each layer since the precoding process is performed.
  • the first reconstruction process of the interference randomization pattern is performed.
  • the inverse conversion process may be performed by a combination of two or more symbols, that is, a inverse conversion process in group units.
  • a second despreading process which is a channel compensation and layer reconstruction procedure, which is a second reconstruction process of the interference randomization pattern, is performed.
  • despreading may be performed after channel compensation.
  • channel compensation is performed after despreading, but the order of channel compensation and despreading is thus performed.
  • the orthogonality can be restored between the spread signals having broken orthogonality as they pass through different channels.
  • FIG. 11 is a diagram for describing a concept of a sub interference randomization pattern.
  • a sub-interference randomization pattern embodying the length of the interference randomization pattern to a minimum length is illustrated.
  • the length of the interference randomization pattern may be implemented as the minimum length by repeatedly transmitting the length of the interference randomization pattern repeated 2m times, and the method described with reference to FIG. 8.
  • the symbol for the layer 1 and the layer 2 of the cell B may be implemented by applying a cyclic shift of period 3 and offset 1, period 3, and offset 2, respectively.
  • the gain may be reduced, but a high interference randomization gain may be obtained as compared with the case of m repeated transmissions.
  • FIG. 12 is a diagram illustrating an apparatus for transmitting a signal for inter-sal interference randomization according to an embodiment of the present invention.
  • a communication environment may be established between a plurality of terminals and the base station.
  • FIG. 12 the components shown in FIG. 12 are a concept including both the terminal and the base station mentioned in FIGS. 1 to 11.
  • the base station 200 may include a radio frequency unit 210 including a transmitter 211 and a receiver 212, a processor 220, and a memory 230.
  • the overall process of communication such as signal processing, layer processing of the base station 200 is controlled by the processor 220 and the memory 230, the RF unit 210, the processor 220 and the memory ( A connection relationship may be formed between the 230.
  • the RF unit 210 included in the base station 200 may include a transmitter 211 and a receiver 212.
  • the transmitter 211 and the receiver 212 may be configured to transmit and receive signals between the terminal 100 or the base station.
  • the processor 220 is functionally connected to the transmitter 211 and the receiver 212 in the RF unit is a process for the transmitter 211 and the receiver 212 to transmit and receive signals between the terminal 100 and the base stations It can be configured to control. In addition, the processor 220 may perform various processes on the signal to be transmitted and then transmit the signal to the transmitter 211, and may perform the process on the signal received by the receiver 212.
  • the processor 220 may store the information included in the exchanged message in the memory (230). With such a structure, the base station 200 can perform the method of various embodiments of the present invention described above.
  • the terminal 100 includes an RF unit 110 including a transmitter 111 and a receiver 112, and the RF unit 110 transmits a signal with the serving base station 200 and Is configured to receive.
  • the processor 120 of the terminal 100 is functionally connected with the transmitter 111 and the receiver 112 such that the transmitter 111 and the receiver 112 are other devices including the base station 200. It may be configured to control the process of transmitting and receiving signals with the. In addition, the processor 120 may transmit to the transmitter 111 after performing various processes for the signal to be transmitted and may perform the process for the signal received by the receiver 112.
  • the processor 120 may store information included in the exchanged message in the memory 130.
  • Processors 120 and 220 of terminal 100 and base station 200 instruct (eg, control, coordinate, manage) operations of terminal 100 and base station 200.
  • Each of the processors 120 and 220 may also be connected with memories 130 and 230 capable of storing program codes and data.
  • the memories 130 and 230 may be connected to the processors 120 and 220 to store operating systems, applications, and general files.
  • the processor 120, 220 of the present invention may also be referred to as a controller, a microcontroller, a microprocessor, a microcomputer, or the like.
  • the processor (120, 220) may be implemented by hardware (hardware) or firmware (fir) are), software, or a combination thereof.
  • an embodiment of the present invention may be implemented in the form of modules, procedures, functions, etc. that perform the functions or operations described above.
  • the software code may be stored in the memory 130, 230 and driven by the processor 120, 220.
  • the memory may be located inside or outside the terminal 100 and the base station 200, and may exchange data with the processors 120 and 220 by various known means.
  • ASICs app 1 i cat ion speci fic integrated ci rcui ts
  • DSPs digi tal signal processors
  • DSPDsCdigi tal s configured to perform the present invention Ignal processing deviations (PLDs), programmable logi devi ces (PLDs), fidelable gate arrays (FPGAs), and the like may be provided in the processors 120 and 220.
  • the above-described method can be written in a program that can be executed in a computer, it can be implemented in a general-purpose digital computer to equalize the program using a computer readable medium.
  • the structure of the data used in the above-described method can be recorded on the computer-readable medium through various means.
  • Program storage devices that may be used to describe storage devices that include executable computer code for performing the various methods of the present invention are not understood to include transient objects, such as carrier waves or signals. Should not be.
  • the computer readable medium includes a storage medium such as a magnetic storage medium (eg, a ROM, a floppy disk, a hard disk, etc.), and an optical reading medium (eg, a CD, a DVD, etc.).
  • the method for transmitting a signal for inter-cell interference randomization in a wireless communication system supporting the MIM0 method of the present invention can be applied to various systems and apparatuses for transmitting a signal for interference randomization.

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  • Engineering & Computer Science (AREA)
  • Computer Networks & Wireless Communication (AREA)
  • Signal Processing (AREA)
  • Radio Transmission System (AREA)

Abstract

La présente invention concerne un procédé de transmission d'un signal pour la répartition au hasard des interférences entre cellules dans un système de communication sans fil prenant en charge un schéma MIMO, et un dispositif pour cela. Le procédé de transmission, à partir d'une extrémité de transmission dans un système de communication sans fil prenant en charge un schéma MIMO, un signal pour la répartition au hasard des interférences entre cellules, selon un mode de réalisation de la présente invention, comprend les étapes suivantes : diviser un signal de transmission qui doit être transmis par une première couche parmi un nombre N de couches prises en charge dans le MIMO dans le nombre N de couches, et appliquer un code d'élargissement différent pour chacune d'entre elles ; appliquer un motif de répartition au hasard d'interférences (motif d'IR) à chaque signal du nombre N de signaux de transmission qui ont été élargis en leur appliquant les codes d'élargissement différents entre eux ; et précoder le nombre N de signaux de transmission auxquels les motifs d'IR sont appliqués, et transmettre ceux-ci à une extrémité de réception, où le motif d'IR est formé en répétant M fois un ou plusieurs symboles dans le signal de transmission, et M peut être un entier supérieur à 2.
PCT/KR2014/012629 2014-12-22 2014-12-22 Procédé de transmission de signal pour la répartition au hasard des interférences entre cellules dans un système de communication sans fil prenant en charge un schéma mimo, et dispositif pour cela WO2016104819A1 (fr)

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Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
KR20080021020A (ko) * 2005-05-12 2008-03-06 노키아 지멘스 네트웍스 게엠베하 운트 코. 카게 통신 단말기들 사이의 간섭을 제어하는 방법
US20090181692A1 (en) * 2008-01-14 2009-07-16 Qualcomm Incorporated Resource allocation randomization
US20090274105A1 (en) * 2008-05-02 2009-11-05 Choi Yang-Seok OFDMA contention-based random access channel design for mobile wireless systems
WO2012005516A2 (fr) * 2010-07-07 2012-01-12 엘지전자 주식회사 Procédé et appareil de transmission d'informations de commande dans un système de communication sans fil
US20130044581A1 (en) * 2007-08-10 2013-02-21 Samsung Electronics Co., Ltd. Apparatus and method for allocating code resources to uplink ack/nack channels in a cellular wireless communication system

Patent Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
KR20080021020A (ko) * 2005-05-12 2008-03-06 노키아 지멘스 네트웍스 게엠베하 운트 코. 카게 통신 단말기들 사이의 간섭을 제어하는 방법
US20130044581A1 (en) * 2007-08-10 2013-02-21 Samsung Electronics Co., Ltd. Apparatus and method for allocating code resources to uplink ack/nack channels in a cellular wireless communication system
US20090181692A1 (en) * 2008-01-14 2009-07-16 Qualcomm Incorporated Resource allocation randomization
US20090274105A1 (en) * 2008-05-02 2009-11-05 Choi Yang-Seok OFDMA contention-based random access channel design for mobile wireless systems
WO2012005516A2 (fr) * 2010-07-07 2012-01-12 엘지전자 주식회사 Procédé et appareil de transmission d'informations de commande dans un système de communication sans fil

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