KR20160092456A - Terminal operating as mobile personal cell base station, and signal reception method of the same - Google Patents

Terminal operating as mobile personal cell base station, and signal reception method of the same Download PDF

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Publication number
KR20160092456A
KR20160092456A KR1020150039206A KR20150039206A KR20160092456A KR 20160092456 A KR20160092456 A KR 20160092456A KR 1020150039206 A KR1020150039206 A KR 1020150039206A KR 20150039206 A KR20150039206 A KR 20150039206A KR 20160092456 A KR20160092456 A KR 20160092456A
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South Korea
Prior art keywords
signal
terminal
control information
base station
codeword
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KR1020150039206A
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Korean (ko)
Inventor
조대순
김일규
방승찬
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한국전자통신연구원
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Publication of KR20160092456A publication Critical patent/KR20160092456A/en

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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
    • H04B7/08—Diversity systems; Multi-antenna system, i.e. transmission or reception using multiple antennas using two or more spaced independent antennas at the receiving station
    • H04B7/0837—Diversity systems; Multi-antenna system, i.e. transmission or reception using multiple antennas using two or more spaced independent antennas at the receiving station using pre-detection combining
    • H04B7/0842—Weighted combining
    • H04B7/0848—Joint weighting
    • H04B7/0854—Joint weighting using error minimizing algorithms, e.g. minimum mean squared error [MMSE], "cross-correlation" or matrix inversion
    • 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
    • H04B7/0413—MIMO systems
    • H04B7/0452—Multi-user MIMO systems

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  • Engineering & Computer Science (AREA)
  • Computer Networks & Wireless Communication (AREA)
  • Signal Processing (AREA)
  • Physics & Mathematics (AREA)
  • Mathematical Physics (AREA)
  • Mobile Radio Communication Systems (AREA)

Abstract

A first terminal capable of operating as a base station receives first control information to decode a first signal corresponding to a first code word from a first base station. The first terminal receives second control information to decode a second signal corresponding to a second code word through a sidehaul link between the first terminal and a second terminal, from the second terminal capable of operating as a base station. The first terminal decodes the second signal by using the second control information. The first terminal removes interference as to the first signal, by using the decoded second signal. The first terminal decodes the first signal from which interference is removed, by using the first control information. The objective of the present invention is to provide a method and an apparatus to increase reception performance of a terminal in a mobile personal cell system.

Description

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a terminal operating as a mobile personal cell base station and a method of receiving a signal,

The present invention relates to a terminal operating as a mobile personal cell base station and a method for the terminal to receive a signal.

Mobility is provided in mobile personal cell backhaul systems. That is, unlike the existing system, a mobile personal cell backhaul system can move a macro cell base station through a backhaul link. Therefore, when the terminals are paired for MU-MIMO (Multi User Multi Input Multi Output), the performance of the terminals may deteriorate. That is, when the terminals are paired in the MU-MIMO environment (mode), since the terminal moves, the reception performance of the terminal may deteriorate.

SUMMARY OF THE INVENTION It is an object of the present invention to provide a method and apparatus for enhancing reception performance of a mobile station in a mobile personal system.

According to an embodiment of the present invention, a method is provided in which a first terminal capable of operating as a base station receives a signal. Receiving the first control information for decoding a first signal corresponding to a first codeword from a first base station; Receiving second control information for decoding a second signal corresponding to a second codeword from a second terminal operable as a base station through a sidehaul link between the first terminal and the second terminal step; Decoding the second signal using the second control information; Using the decoded second signal to remove interference with the first signal; And decoding the interference-canceled first signal using the first control information.

The first terminal and the second terminal may operate as a mobile personal cell base station.

The first base station may be a macro cell base station.

The step of receiving the first control information may include receiving the first control information through a backhaul link between the first base station and the first terminal.

The first terminal and the second terminal may be paired with each other for MU (Multiple User) -MIMO (Multiple Input Multiple Output).

The first signal may be a signal transmitted from the first base station to the first terminal.

The second signal may be a signal transmitted by the first base station to the second terminal but received by the first terminal.

The first control information may be a downlink control format indicator for the first terminal.

The second control information may be a downlink control format indicator for the second terminal.

The decoding of the second signal may include detecting a first symbol through Minimum Mean Square Error (MMSE) filtering from the second signal; And calculating a log likelihood ratio (LLR) for decoding using the first symbol.

The interference cancellation may include applying one of a parallel interference cancellation scheme and a successive interference cancellation scheme to the decoded second signal to remove interference of the first signal Step < / RTI >

The interference cancellation may include encoding and modulating the decoded second signal to produce a third signal; And generating a fourth signal, which is the first signal from which the interference is canceled, by subtracting the third signal from the received signal including the first signal.

The step of decoding the interference canceled first signal may include detecting a first symbol from the fourth signal through Minimum Mean Square Error (MMSE) filtering; And calculating a log likelihood ratio (LLR) for decoding using the first symbol.

According to another embodiment of the present invention, there is also provided a method for a first terminal capable of operating as a base station to receive a signal. Receiving a first control information for decoding a signal of a first codeword for the first terminal from a first base station; Receiving, from the first base station, second control information for decoding a signal of a second codeword for a second terminal; Decoding the signal of the second codeword using the second control information; Removing interference for the signal of the first codeword using the signal of the decoded second codeword; And decoding the signal of the first code word with the interference removed using the first control information.

The step of receiving the first control information may include receiving the first control information through a backhaul link between the first base station and the first terminal.

The receiving of the second control information may include receiving the second control information via the backhaul link.

The removing the interference for the signal of the first codeword may include applying one of a parallel interference cancellation scheme and a successive interference cancellation scheme to the decoded second codeword signal And removing interference for the first code word signal.

Further, according to another embodiment of the present invention, a terminal is provided. The terminal comprising: a memory; And a processor, coupled to the memory, for controlling operation as a mobile personal base station.

The processor is configured to receive first control information for decoding a signal of a first codeword on a backhaul link with a macro cell base station and to receive a second control information for decoding a signal of a second codeword Receiving control information over a sidehaul link with another terminal operable as a mobile personal cell base station, decoding the signal of the second codeword using the second control information, and transmitting the decoded second The signal for the first codeword can be removed using the signal of the codeword, and the signal of the first codeword for which the interference is canceled can be decoded using the first control information.

According to an embodiment of the present invention, it is possible to apply an iterative reception algorithm by transmitting / receiving control information using a side hole between terminals in a mobile personal system.

In addition, according to the embodiment of the present invention, in a mobile personal system, a terminal shares control information (e.g., DCI information) through a sidehaul to thereby effect transmission and reception of a multi-codeword in an MU-MIMO environment Can be obtained. Through this, the iterative reception algorithm can be applied, and the reception performance can be improved.

Also, according to the embodiment of the present invention, the reception performance can be improved by applying the iterative reception algorithm even in a low SNR (Signal to Noise Ratio) environment.

1 is a diagram illustrating a mobile personal cell system according to an embodiment of the present invention.
2 is a diagram illustrating an MU-MIMO transmission scheme.
3 is a diagram showing a configuration of a transmitter.
4 is a diagram showing a configuration of a receiver.
5 is a diagram showing a configuration of a receiver that receives a signal using an iterative reception algorithm.
6 is a diagram illustrating a configuration of a UE capable of operating as a mobile personal cell according to an embodiment of the present invention.

Hereinafter, embodiments of the present invention will be described in detail with reference to the accompanying drawings so that those skilled in the art can easily carry out the present invention. The present invention may, however, be embodied in many different forms and should not be construed as limited to the embodiments set forth herein. In order to clearly illustrate the present invention, parts not related to the description are omitted, and similar parts are denoted by like reference characters throughout the specification.

Throughout the specification, a terminal is referred to as a mobile terminal (MT), a mobile station (MS), an advanced mobile station (AMS), a high reliability mobile station ), A subscriber station (SS), a portable subscriber station (PSS), an access terminal (AT), a user equipment (UE) MS, AMS, HR-MS, SS, PSS, AT, UE, and the like.

The macro cell base station includes a base station (BS), an advanced base station (ABS), a high reliability base station (HR-BS), a node B, An evolved node B, an access point (AP), a radio access station (RAS), a base transceiver station (BTS), a mobile multihop relay (MMR) A relay station (RS) serving as a base station, a high reliability relay station (HR-RS) serving as a base station, etc., , Node B, eNodeB, AP, RAS, BTS, MMR-BS, RS, HR-RS, and the like.

1 is a diagram illustrating a mobile personal cell system (or mobile personal cell backhaul system) in accordance with an embodiment of the present invention. More specifically, FIG. 1 shows a mobile personal cell system to which MU-MIMO (Multi User-Multiple Input Multiple Output) is applied.

The terminals 200 and 300 may operate as mobile personal cell base stations. When the terminals 200 and 300 operate as a mobile personal cell base station, the terminals 200 and 300 may have individual cells C2 and C3. The individual cells C2 and C3 of the terminals 200 and 300 are smaller than the macro cells C1 of the macro cell base station 100. [ The terminals 200 and 300 may be paired with each other for MU-MIMO.

The mobile personal cell backhaul links BL1 and BL2 are links between the macrocell base station 100 and each of the terminals 200 and 300. [ Mobile personal cell backhaul links (BL1, BL2) are high-speed backhaul links and have mobility in particular. Meanwhile, in order to increase the average throughput, an MU-MIMO environment can be considered.

MIMO can be classified into Single User-Multiple Input Multiple Output (SU-MIMO) and MU-MIMO depending on how many users simultaneously use the same radio resources. The SU-MIMO transmission scheme is a scheme in which all the layers are transmitted to one user when the macro cell base station 100 transmits a plurality of layers. The MU-MIMO transmission scheme is a scheme in which each layer is transmitted to another user when the macro cell base station 100 transmits a plurality of layers.

The macro cell base station 100 transmits control information CI1 and CI2 to the terminals 200 and 300. [ Specifically, the control information CI1 and CI2 includes information for signal demodulation and signal decoding, and may be a downlink control format indicator (DCI). The macro cell base station 100 can transmit the control information CI1 to the terminal 200 via the backhaul link BL1 with the terminal 200 and can transmit the control information CI1 to the terminal 200 through the backhaul link BL2 with the terminal 300. [ (CI2) to the terminal (300).

Meanwhile, a sidehaul link SL1 exists between the terminal 200 and the terminal 300. [ The terminals 200 and 300 can share their control information CI1 and CI2 with each other via the sidehaul link SL1. Specifically, the terminal 200 may transmit its control information CI1 to the terminal 300 via the side-hall link SL1, and the terminal 300 may transmit its control information CI2 to the side- SL1 to the terminal 200 via the network.

2 is a diagram illustrating an MU-MIMO transmission scheme. 2 illustrates a case where a macro-cell BS 100 transmits a signal to a plurality of MSs 200, 300, and 400 through an MU-MIMO transmission scheme.

When the macro cell base station 100 uses the MU-MIMO transmission scheme, the macro cell base station 100 transmits a plurality of data D1, D2 and D3 through a plurality of channels CH1, CH2 and CH3, To the terminals (200, 300, 400).

Unlike the existing system, the mobile personal cell system can move the terminals 200 and 300 connected to the macro cell base station 100 and the backhaul links BL1 and BL2. Therefore, reception performance of the terminals 200 and 300 paired for MU-MIMO may be deteriorated.

The paired terminals 200 and 300 can reduce the interference between the paired terminals 200 and 300 by sharing their control information CI1 and CI2. Accordingly, the paired terminals 200 and 300 can improve their reception performance.

In the mobile personal cell system, a side hole link SL1 is provided for the terminal 200 and the terminal 300, unlike the existing system. Accordingly, the paired UEs 200 and 300 can exchange their control information CI1 and CI2 through the side-hall link SL1. If the paired UEs 200 and 300 can exchange the control information CI1 and CI2 with each other, it is possible to perform repeated reception such as successive interference cancellation (SIC) or parallel interference cancellation (PIC) Algorithm can be applied, which can increase the reception performance.

The terminals 200 and 300 can improve the reception performance by applying the iterative reception algorithm. In general, for an iterative reception algorithm to be applied, a multi-codeword must be transmitted and received. In a recent mobile communication system such as an LTE (Long Term Evolution) system or an LTE-A (Advanced) system, data transmitted by a transmitter supports multi-codewords. The reason that multi-codewords are supported is to improve receiver reception performance. Specifically, when a multi-codeword is supported, the receiver may perform demodulation and decoding, then remove interference for each codeword and perform demodulation and decoding again.

3 is a diagram showing the configuration of the transmitter 500. As shown in FIG. Specifically, the macro cell base station 100 and the terminals 200 and 300 may have the same or similar configuration as that of the transmitter 500.

The transmitter 500 includes an encoder 510 for performing an encoding function and a modulator 520 for performing a modulation function.

The encoder 510 includes a rate encoder 512 that performs rate matching with a channel encoder 511 that performs channel encoding.

The modulator 520 includes an interleaver 521 for performing interleaving, and a symbol mapper 522 for performing symbol mapping. The output signal of the symbol mapper 522 is transmitted over the MIMO channel.

4 is a diagram showing a configuration of a receiver 600. As shown in FIG. Specifically, the macro cell base station 100 and the terminals 200 and 300 may have the same or similar configuration as that of the receiver 600.

The receiver 600 includes a demodulator 610 that performs a demodulation function, and a decoder 620 that performs a decoding function.

The demodulator 610 includes an MMSE detector 611 for performing a minimum mean square error (MMSE) filtering on a received signal, a demapper 612 for calculating a log likelihood ratio (LLR), and a demodulator 612 for performing deinterleaving And a deinterleaver 613. The signal received via the MIMO channel is input to the MMSE detector 611. The demodulator 610 may also include other detectors instead of the MMSE detector 611.

The decoder 620 includes a derate matcher 621 that performs de-rate matching, and a channel decoder 622 that performs channel decoding.

Meanwhile, when a MIMO transmission / reception system supporting spatial multiplexing supports a multi-codeword, a receiver 600 applies an iterative reception algorithm to improve reception performance. Specifically, a first demodulation and decoding algorithm (Hereinafter referred to as a 'first decoding algorithm'), and then performs a second demodulation and decoding algorithm (hereinafter referred to as a 'second decoding algorithm') after eliminating the interference.

When the receiver 600 performs the first decoding algorithm, the MMSE detector 611 detects the symbol, the demapper 612 calculates the LLR value using the detected symbol, and the deinterleaver 613 The calculated LLR values are deinterleaved and input to the decoder 620, and the decoder 620 performs decoding using the input LLR values.

Operations after the first decoding algorithm (interference cancellation, second decoding algorithm) will be described with reference to FIG.

5 is a diagram illustrating a configuration of a receiver 600 that receives a signal using an iterative reception algorithm. Specifically, the configuration of the receiver 600 illustrated in FIG. 5 uses the results of the first decoding algorithm to remove interference and then performs a second decoding algorithm. The macro cell base station 100 and the terminals 200 and 300 may have the same or similar configuration as that of the receiver 600 illustrated in FIG. Meanwhile, FIG. 5 illustrates a case where the receiver 600 uses the parallel interference cancellation (PIC) scheme among the iterative reception algorithms. However, this is merely an example, and embodiments of the present invention can be applied to a sequential interference cancellation (SIC) scheme.

In FIG. 5, the first decoding path corresponds to the first decoding algorithm, and the second decoding path corresponds to the operation after the first decoding algorithm (interference cancellation, second decoding algorithm). In FIG. 5, each element of the received signal (

Figure pat00001
,
Figure pat00002
) Corresponds to each code word, and each data ("
Figure pat00003
,
Figure pat00004
) Corresponds to each codeword.

Each demapper 612a, 612b corresponds to each codeword and performs the same function as the demapper 612 of FIG. Each of the deinterleavers 613a and 613b corresponds to each code word and performs the same function as the deinterleaver 613 of FIG. Each of the decoders 620a and 620b corresponds to each code word and performs the same function as the decoder 620 of FIG.

The receiver 600 receives the data (< RTI ID = 0.0 >

Figure pat00005
,
Figure pat00006
And performs operations such as encoding and modulation performed by the original transmitter 500 through the modulators 630a and 630b. Each modulator 630a, 630b corresponds to each code word and performs the same / similar function as the function of the encoder 51 and the modulator 520 of Fig. Thus, the receiver 600 can generate transmission symbol data having no interference for each codeword.

The receiver 600 then receives the originally received input value (

Figure pat00007
) Through the interference cancellers 640a and 640b for each codeword. Each of the interference eliminators 640a and 640b corresponds to each codeword, and the received value (
Figure pat00008
The output values of the modulators 630a and 630b
Figure pat00009
,
Figure pat00010
) To remove interference for each codeword.

The receiver 600 compares the value obtained by removing the interference for each codeword (

Figure pat00011
,
Figure pat00012
) To apply the second decoding algorithm. When the receiver 600 applies the second decoding algorithm, it performs the same / similar operation as applying the first decoding algorithm. Specifically, the receiver 600 detects the symbol through the MMSE detector 611, calculates the LLR value through the demapper 612a, 612b using the detected symbol, and outputs the deinterleaver 613a and 613b and performs decoding through the decoders 620a and 620b using the LLR values output from the deinterleavers 613a and 613b. Accordingly, the receiver 600 can improve the reception performance by performing demodulation and decoding using interference-free symbols.

As described above, in order to apply the iterative reception algorithm, the terminals 200 and 300, which are the receivers 600, transmit and receive multi-codewords. In the MU-MIMO environment of the mobile personal system, Only one codeword is transmitted to each of the terminals 200 and 300. Therefore, it is impossible to apply the iterative reception algorithm fundamentally in the MU-MIMO environment of the mobile personal cell system. In order to improve the reception performance of the terminals 200 and 300, it is necessary to apply an iterative reception algorithm. For this, a method of applying multi-code word transmission / reception is required.

A case may occur in which a signal (e.g., y 2 ) to be input to the terminal 300 is also input to the terminal 200 when the terminal 200 demodulates the received signal (e.g., y 1 ). Conversely, when the terminal 300 demodulates the received signal, a signal to be input to the terminal 200 may be input to the terminal 300 as well. In this case, interference may occur between the terminals 200 and 300. If the terminal 200 and the terminal 300 know the control information CI1 and CI2 of the other party, the results of transmitting and receiving the multi-codeword can be obtained in cooperation with each other. That is, each of the terminals 200 and 300 receiving a single codeword cooperates with each other to obtain a result that the multi-codeword is transmitted and received. To this end, the terminal 200 and the terminal 300 exchange their control information CI1 and CI2 using the side-hall link SL1. 5) to be input to the terminal 200 from the macrocell base station 100 and the second signal (e.g., y 1 ) to be input to the terminal 300, , with the case of receiving a y 2) of Figure 5, using the control information (CI2) of the terminal 300 transmitted through the side hole link (SL1) and decodes a second signal (a first decoding algorithm), decoding Results (eg,

Figure pat00013
) To remove the interference for the first signal, and the first interference canceled signal (e.g.,
Figure pat00014
) Using the control information CI1 of the terminal 200 (second decoding algorithm).

Meanwhile, the iterative reception algorithm (interference cancellation + second decoding algorithm) performed by the receiver 600 will be described in more detail. The MMSE detector 611 performs MMSE filtering on the interference canceled received signal using the symbol estimates. The demappers 612a and 612b use the outputs of the MMSE detector 611 in units of symbols to obtain LLR values in units of bits. The decoders 620a and 620b receive the LLR values from the deinterleavers 613a and 613b and output the LLRs

Figure pat00015
,
Figure pat00016
).

The receiver 600 can improve the reception performance by removing the interference using the result obtained through the first decoding algorithm and then performing the second decoding algorithm again. In the case where the receiver 600 performs the iterative reception algorithm, interference cancellation is essential. In recent mobile communication systems such as the LTE system or the LTE-A system, the transmission data is generally composed of two codewords, in order that the receiver 600 can eliminate interference between each codeword to improve reception performance It is for this reason. Specifically, the receiver 600 decodes the decoded data of a codeword having a good CRC (Cyclic Redundancy Check) among two codewords (e.g.,

Figure pat00017
) And use the symbol (
Figure pat00018
). And the receiver 600 receives the originally received signal (
Figure pat00019
) To the symbol (
Figure pat00020
) Of the other code word from which the interference is removed,
Figure pat00021
). The interference cancellation method includes the sequential interference cancellation (SIC) method and parallel interference cancellation (PIC).

On the other hand, the MMSE detector for the first decoding algorithm or the second decoding algorithm is a representative algorithm of the detector, and its operation principle will be briefly described.

Assuming that the complex-valued symbols are x (m), they are independent of each other,

Figure pat00022
And a random variable w (m) following a Gaussian distribution with an average of 0, the following equation (1) holds.

Figure pat00023

A linear transform that minimizes the mean-squared estimation error for the transmitted symbols,

Figure pat00024
Is given by the following equation (2).

Figure pat00025

The following equation (3) is established as a necessary condition for the transform.

Figure pat00026

In Equation 3, E [] is an expectation. In Equation (3), I 4 corresponds to the number of antennas.

Since the channel state matrix H has a full-column rank, an MMSE weight matrix is used,

Figure pat00027
Can be calculated by the following equation (4).

Figure pat00028

In computing equation (4), the operand of the inverse operation < RTI ID = 0.0 >

Figure pat00029
Is a NumLyr-dimensional Hermitian matrix, and can be decomposed into the products of three matrices L · D · L * relatively easily by modified Gaussian elimination and Cholesky decomposition . Here, L · D · L * L of the lower triangular matrix is a complex value (complex-valued lower triangular matrix) of the same dimension, and all of the diagonal elements (diagonal elements) 1. In L, D, and L * , D is a real-valued diagonal matrix. According to Equation (5) below, decomposition can be performed sequentially by one row. The LDU decomposition for the Hermitian matrix (U is an upper triangular matrix) is calculated by the following equation (5).

Figure pat00030

MMSE weight matrix

Figure pat00031
Can be calculated by the solution of the simultaneous equations of Equation (6) below.

Figure pat00032

Figure pat00033
, The elements of the MMSE weight matrix can be obtained sequentially according to Equation (7) below. Back substitution with given LDU decomposition is performed using LDU decomposition.

Figure pat00034

The output signal is a function of the estimated symbol and the noise variance and is determined as: < EMI ID = 8.0 >

Figure pat00035

Figure pat00036

In Equation (8), a column vector c is expressed by Equation (9) below.

Figure pat00037

In order to perform interference cancellation, the terminals 200 and 300, which are the receivers 600, first transmit the decoded result through the first decoding algorithm (e.g.,

Figure pat00038
,
Figure pat00039
), Performs a series of procedures such as scrambling, rate matching, and symbol mapping (a procedure performed in an encoder and a modulator) to generate a symbol (e.g.,
Figure pat00040
,
Figure pat00041
). That is, on the assumption that the CRC is good, a clear signal with no interference (e.g.,
Figure pat00042
,
Figure pat00043
) May be generated for each codeword. In this case, the terminals 200 and 300 transmit the generated clean signal (e.g.,
Figure pat00044
,
Figure pat00045
(For example, y in FIG. 5) by subtracting the original received signal from the original received signal (e.g., y in FIG. 5)
Figure pat00046
,
Figure pat00047
Can be generated. Specifically, each of the terminals 200 and 300 receives an interference signal (e.g.,
Figure pat00048
,
Figure pat00049
) From the received signal (e.g., y in Fig. 5) stored in the buffer.

Then, the terminals 200 and 300 transmit a pure signal (data, for example,

Figure pat00050
,
Figure pat00051
) To perform a second decoding algorithm operation including an MMSE detection operation. Specifically, after eliminating the interference, the UEs 200 and 300 can reapply the MMSE detection algorithm performed in the first decoding algorithm.

Then, the terminals 200 and 300 calculate LLR values using the symbols and SNR values generated through the MMSE detection algorithm. The terminals 200 and 300 perform decoding using the calculated LLR values. Thus, the terminals 200 and 300 can improve reception performance.

6 is a diagram illustrating a configuration of a terminal 200 capable of operating as a mobile personal cell according to an embodiment of the present invention.

The terminal 200 may further include a processor 260, a memory 270, and a radio frequency (RF)

The processor 260 may be configured to implement the procedures, functions, and methods associated with the terminal 200 described above. Each configuration of the terminal 200 can be executed by the processor 260.

The memory 270 is coupled to the processor 260 and stores various information related to the operation of the processor 260.

RF converter 280 is coupled to processor 260 and transmits or receives radio signals. The terminal 200 may have a single antenna or multiple antennas.

Meanwhile, the terminal 300 may be configured to be the same as or similar to the terminal 200.

The case where the terminals 200 and 300 exchanged their control information CI1 and CI2 through the side hole link SL1 between the terminal 200 and the terminal 300 has been described as an example, It's just an example. Alternatively, the macro cell base station 100 may transmit all of the control information (CI1, CI2) for the terminals 200, 300 to the terminals 200, 300. For example, the macro cell base station 100 notifies the terminal 200 of the control information CI1 for the terminal 200 as well as the control information CI2 for the other terminal 300 to the terminal 200, Lt; RTI ID = 0.0 > BL1 < / RTI > In this case, the terminal 200 can perform the first decoding algorithm, the interference cancellation, and the second decoding algorithm using the control information CI1 and CI2, as described above.

While the present invention has been particularly shown and described with reference to exemplary embodiments thereof, it is to be understood that the invention is not limited to the disclosed exemplary embodiments, It belongs to the scope of right.

Claims (20)

A method for a first terminal capable of operating as a base station to receive a signal,
Receiving first control information for decoding a first signal corresponding to a first codeword from a first base station;
Receiving second control information for decoding a second signal corresponding to a second codeword from a second terminal operable as a base station through a sidehaul link between the first terminal and the second terminal step;
Decoding the second signal using the second control information;
Using the decoded second signal to remove interference with the first signal; And
Using the first control information, decoding the first signal from which the interference has been removed
/ RTI > The method according to claim 1,
The first terminal and the second terminal may operate as a mobile personal cell base station,
The first base station is a macro cell base station
Signal receiving method. 3. The method of claim 2,
Wherein the step of receiving the first control information comprises:
And receiving the first control information over a backhaul link between the first base station and the first terminal
Signal receiving method. 3. The method of claim 2,
The first terminal and the second terminal are paired with each other for MU (Multiple User) -MIMO (Multiple Input Multiple Output)
Signal receiving method. 5. The method of claim 4,
Wherein the first signal is a signal transmitted from the first base station to the first terminal,
The second signal is a signal transmitted from the first base station to the second terminal but received by the first terminal
Signal receiving method. 3. The method of claim 2,
Wherein the first control information is a downlink control format indicator for the first terminal,
The second control information includes a downlink control format indicator for the second terminal
Signal receiving method. 3. The method of claim 2,
Wherein the decoding of the second signal comprises:
Detecting a first symbol from the second signal through Minimum Mean Square Error (MMSE) filtering; And
And calculating a log likelihood ratio (LLR) for decoding using the first symbol
Signal receiving method. 3. The method of claim 2,
The method of claim 1,
Applying one of a parallel interference cancellation scheme and a successive interference cancellation scheme to the decoded second signal to remove interference of the first signal;
Signal receiving method. 3. The method of claim 2,
The method of claim 1,
Encoding and modulating the decoded second signal to produce a third signal; And
And subtracting the third signal from the received signal that includes the first signal to generate a fourth signal that is the first signal with the interference removed
Signal receiving method. 10. The method of claim 9,
Wherein the step of decoding the interference-
Detecting a first symbol through Minimum Mean Square Error (MMSE) filtering from the fourth signal; And
And calculating a log likelihood ratio (LLR) for decoding using the first symbol
Signal receiving method. A method for a first terminal capable of operating as a base station to receive a signal,
Receiving, from a first base station, first control information for decoding a signal of a first codeword for the first terminal;
Receiving, from the first base station, second control information for decoding a signal of a second codeword for a second terminal;
Decoding the signal of the second codeword using the second control information;
Removing interference for the signal of the first codeword using the signal of the decoded second codeword; And
Decoding the signal of the first codeword from which the interference has been removed using the first control information
/ RTI > 12. The method of claim 11,
The first terminal and the second terminal may operate as a mobile personal cell base station,
The first base station is a macro cell base station
Signal receiving method. 13. The method of claim 12,
The first terminal and the second terminal are paired with each other for MU (Multiple User) -MIMO (Multiple Input Multiple Output)
Signal receiving method. 14. The method of claim 13,
Wherein the first control information is a downlink control format indicator for the first terminal,
The second control information includes a downlink control format indicator for the second terminal
Signal receiving method. 15. The method of claim 14,
Wherein the step of receiving the first control information comprises:
And receiving the first control information through a backhaul link between the first base station and the first terminal,
Wherein the step of receiving the second control information comprises:
And receiving the second control information over the backhaul link
Signal receiving method. 15. The method of claim 14,
Wherein removing the interference for the signal of the first code word comprises:
And a step of removing interference for the first codeword signal by applying one of a parallel interference cancellation scheme and a successive interference cancellation scheme to the decoded second codeword signal doing
Signal receiving method. 15. The method of claim 14,
Wherein removing the interference for the signal of the first code word comprises:
Encoding and modulating the signal of the decoded second codeword to produce a first signal; And
Generating a second signal that is a signal of the first code word from which the interference is removed by subtracting the first signal from a received signal that includes the signal of the first code word
Signal receiving method. 18. The method of claim 17,
Wherein the step of decoding the signal of the first code word from which the interference is removed comprises:
Detecting a first symbol from the second signal through Minimum Mean Square Error (MMSE) filtering; And
And calculating a log likelihood ratio (LLR) for decoding using the first symbol
Signal receiving method. Memory; And
And a processor coupled to the memory and operative to operate as a mobile personal base station,
The processor comprising:
The first control information for decoding the signal of the first codeword is received via a backhaul link with the macro cell base station and the second control information for decoding the signal of the second codeword is transmitted to the mobile station Receiving a signal of the second codeword using the second control information, receiving a signal of the decoded second codeword, receiving the signal of the second codeword, To remove the interference for the signal of the first codeword and to decode the signal of the first codeword with the interference removed using the first control information
Terminal. 20. The method of claim 19,
The processor comprising:
Generating a first signal by encoding and modulating a signal of the decoded second codeword, and subtracting the first signal from a received signal that includes the signal of the first codeword, Lt; RTI ID = 0.0 >
Terminal.
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