KR20180007729A - Apparatus and method for transmitting and receiving signal in wireless communication system - Google Patents

Abstract

The present invention relates to a 5^th generation (5G) or a free 5G (pre-5G) communication system which is provided to support a higher data transmission rate after 4^th (4G) generation communication system such as the long term evolution (LTE). An operating method of a transmitting device in a wireless communication system of the present invention comprises a step which transmits first information and second information to a first receiving device. The first information indicates whether a non-orthogonal multiple access (NOMA) is applied to a second receiving device, pairing with the first receiving device, or not, when a sliding window superposition coding method is applied to the first receiving device. The second information relates to the NOMA when the NOMA is applied to the second receiving device.

Description

[0001] APPARATUS AND METHOD FOR TRANSMITTING AND RECEIVING SIGNAL IN WIRELESS COMMUNICATION SYSTEM [0002]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an apparatus and method for transmitting / receiving signals in a wireless communication system, and more particularly to a system and method for transmitting / receiving signals in a wireless communication system, The present invention relates to an apparatus and method for transmitting / receiving signals based on a window superposition coding (SWSC) scheme.

4G (4 ^th -generation: 4G, hereinafter referred to as "4G" will be referred to) in order to meet the traffic demand in the radio data communication system increases since the commercialization trends, improved 5G (5 ^th -generation: 5G, the " 5G ") communication system or pre-5G (hereinafter referred to as "pre-5G ") communication system. For this reason, a 5G communication system or a pre-5G communication system may be used in a 4G network communication system or a long-term evolution (LTE) (post-LTE) .

In order to achieve a high data rate, the 5G communication system is considered to be implemented in a very high frequency (mmWave) band (for example, a frequency band such as a 60 gigahertz (60GHz) band). In order to mitigate the path loss of the radio wave in the very high frequency band and to increase the propagation distance of the radio wave, a 5G communication system has been used for beam forming, massive multi-input multi-output (massive MIMO) (FD-MIMO) technique, an array antenna technique, and an analog-to-digital (MIMO) Analog beam-forming techniques and large scale antenna technologies are being discussed.

In order to improve the network of the system, the 5G communication system has developed an advanced small cell, an advanced small cell, a cloud radio access network (cloud RAN), an ultra-dense network, A wireless device, a device to device (D2D) communication, a wireless backhaul, a moving network, a cooperative communication, coordinated multi-points (CoMP) , And interference cancellation are being developed.

In addition, in the 5G system, a hybrid frequency shift keying (FSK) scheme, which is an advanced coding modulation (ACM) scheme (hereinafter referred to as " ACM & A hybrid FSK (QAM) scheme and an SWSC scheme, and a filter bank multi-carrier (QAM) scheme, which is an advanced connection technique, (FBMC) technology, a NOMA technology, and a sparse code multiple access (SCMA) technology are being developed.

In a network based on orthogonal multiple access (OMA) scheme, the same resources are transmitted to a plurality of user equipment (UE) But is assigned to a single user terminal. Here, the resources may be time resources and frequency resources. Therefore, a base station (evolved Node B: eNB) allocates resources to UEs capable of maximizing the channel capacity based on the channel environment of each UE and the resource allocation frequency.

Therefore, a UE located in a specific area, such as a cell boundary area, is made relatively less than other UEs whose opportunity to allocate resources is not located in the specific area, and thus a fairness issue between UEs occurs .

On the other hand, in a network based on the NOMA scheme, the same resources are allocated to a plurality of UEs, thereby increasing resource efficiency. Further, in the network based on the NOMA scheme, the average throughput for the eNB is increased by resolving interference issues between UEs that are allocated the same resources through cooperation between the eNBs and UEs, Thereby increasing the resource allocation opportunity for the located UE.

For example, in a network based on a power domain NOMA (hereinafter referred to as "power domain NOMA ") scheme, a UE located near an eNB and a UE located in a cell boundary region are allocated the same resource do. Then, the transmission power allocated to the UE located near the eNB is reduced, and the same amount of transmission power as that of the UE located near the eNB is allocated to the UE located in the cell boundary region .

When the transmission power for the UEs is adjusted in this manner, the UE located near the eNB has an intensity higher than that of the signal transmitted to the UE itself located near the eNB, I.e., an interference signal, transmitted to the UE located in the mobile station UE.

Therefore, the UE located near the eNB first detects a signal transmitted from the eNB to the UE located in the cell boundary region, that is, the interference signal in the received signal. Then, after removing the detected interference signal from the received signal, a signal that is a target of the UE located near the eNB, i.e., a target signal, is detected.

In this case, the UE located near the eNB can greatly reduce the influence of the interference signal due to the superposition transmission of the eNB. In addition, the UE located in the cell boundary region transmits a signal transmitted from the eNB to the UE located in the cell boundary region, that is, a signal transmitted to the UE located near the eNB, that is, So that it is hardly affected by the interference signal.

On the other hand, in a network based on orthogonal frequency division multiple access (OFDMA) scheme, an inter-cell interference signal is inevitably generated, A relatively large performance deterioration can be generated for the user terminal.

In the network based on the NOMA scheme, the same resource is allocated to the UE located in the cell boundary region, which is greatly affected by the inter-cell interference signal between the UE located near the eNB and the UE located near the eNB, If the transmission power is adjusted to solve the interference problem between the UEs located in the boundary region, the eNB allocates a relatively large transmission power to the UE located in the cell boundary region, which is greatly affected by the inter-cell interference signal, A relatively small transmission power is allocated to the UE located near the eNB.

This results in a relatively large performance deterioration for the UE located near the eNB. Therefore, it is a very important issue to reduce the influence of the inter-cell interference signal on the UE located in the cell boundary region in the network based on the NOMA scheme.

On the other hand, the above information is only presented as background information to help understand the present invention. No determination has been made as to whether any of the above content is applicable as prior art to the present invention, nor is any claim made.

An embodiment of the present invention proposes an apparatus and method for transmitting / receiving signals based on the NOMA scheme and the SWSC scheme in a wireless communication system.

In addition, an embodiment of the present invention proposes a signal transmitting / receiving apparatus and method for reducing interference based on the NOMA scheme and the SWSC scheme in a wireless communication system.

In addition, an embodiment of the present invention proposes a signal transmitting / receiving apparatus and method for improving performance based on the NOMA scheme and the SWSC scheme in a wireless communication system.

A method according to an embodiment of the present invention comprises: A method of operating a transmitting apparatus in a wireless communication system, the method comprising: when a sliding window superposition coding scheme is applied to a first receiving apparatus, a second receiving apparatus, which is paired with the first receiving apparatus, Wherein the first information indicates whether or not a non-orthogonal multiple access (NOMA) scheme is applied, and second information that is information related to the NOMA scheme when the NOMA scheme is applied to the second reception apparatus, And transmitting the data to the device.

Another method according to an embodiment of the present invention comprises: A method for operating a receiving apparatus in a wireless communication system, the method comprising: receiving, from a transmitting apparatus, a first receiving apparatus that is paired with the receiving apparatus when a sliding window superposition coding scheme is applied to the receiving apparatus; The method includes receiving first information indicating whether a non-orthogonal multiple access (NOMA) scheme is applied, and receiving second information that is information related to the NOMA scheme when the first receiving apparatus is applied with the NOMA scheme .

Another method according to an embodiment of the present invention includes: A method of operating a receiving device in a wireless communication system, the method comprising: receiving a sliding window over a receiving device from a transmitting device for a first receiving device that is paired based on a non-orthogonal multiple access (NOMA) The method comprising the steps of: receiving first information indicating whether a sliding window superposition coding scheme is applied; and receiving second information that is information related to the SWSC scheme.

Other aspects, advantages and key features of the present invention will become apparent to those skilled in the art from the following detailed description, which is set forth in the accompanying drawings and which discloses preferred embodiments of the invention.

It may be effective to define definitions for certain words and phrases used throughout this patent document before processing the specific description portions of the present disclosure below: "include" and " Comprise "and its derivatives mean inclusive inclusion; The term " or "is inclusive and means" and / or "; The terms " associated with "and " associated therewith ", as well as their derivatives, are included within, (A) to (A) to (B) to (C) to (C) to (C) Be communicable with, cooperate with, interleave, juxtapose, be proximate to, possibility to communicate with, possibility to communicate with, It means big or is bound to or with, have a property of, etc .; The term "controller" means any device, system, or portion thereof that controls at least one operation, such devices may be hardware, firmware or software, or some combination of at least two of the hardware, Lt; / RTI > It should be noted that the functionality associated with any particular controller may be centralized or distributed, and may be local or remote. Definitions for particular words and phrases are provided throughout this patent document and those skilled in the art will recognize that such definitions are not only conventional, But also to future uses of the phrases.

An embodiment of the present invention makes it possible to transmit / receive signals based on the NOMA scheme and the SWSC scheme in a wireless communication system.

In addition, an embodiment of the present invention makes it possible to transmit / receive signals in a wireless communication system to enable reduction of interference based on the NOMA scheme and the SWSC scheme.

In addition, an embodiment of the present invention makes it possible to transmit / receive a signal in a wireless communication system so as to improve performance based on the NOMA scheme and the SWSC scheme.

Further aspects, features and advantages of the present invention as set forth above in connection with certain preferred embodiments thereof will become more apparent from the following description, taken in conjunction with the accompanying drawings, in which:
FIG. 1 is a diagram schematically illustrating an interference environment to which an SWSC scheme is applied in a wireless communication system according to an embodiment of the present invention; FIG.
2 is a diagram schematically illustrating transmission and reception operations according to the SWSC scheme in a wireless communication system according to an embodiment of the present invention;
3 is a diagram schematically illustrating a signal transmission / reception operation according to a power domain NOMA-SWSC scheme in a wireless communication system according to an embodiment of the present invention;
4 is a diagram schematically illustrating an internal structure of a transmission apparatus supporting a power domain NOMA-SWSC scheme in a wireless communication system according to an embodiment of the present invention;
5 is a diagram schematically illustrating an operation procedure of a receiving apparatus supporting a power domain NOMA-SWSC scheme in a wireless communication system according to an embodiment of the present invention;
6 is a diagram schematically illustrating an operation procedure of a near UE in a wireless communication system supporting a power domain NOMA-SWSC scheme according to an embodiment of the present invention;
7 is a diagram schematically illustrating an operation procedure of a far UE in a wireless communication system supporting a power domain NOMA-SWSC scheme according to an embodiment of the present invention;
8 is a diagram schematically illustrating a signal transmission / reception operation according to the SCMA-SWSC scheme in a wireless communication system according to an embodiment of the present invention;
9 is a diagram schematically illustrating an internal structure of a transmission apparatus supporting the SCMA-SWSC scheme in a wireless communication system according to an embodiment of the present invention;
FIG. 10 is a diagram schematically illustrating an operation procedure of a receiving apparatus in a wireless communication system supporting an SCMA-SWSC scheme according to an embodiment of the present invention; FIG.
11 is a view schematically showing another example of the operation procedure of a receiving apparatus in a wireless communication system supporting an SCMA-SWSC scheme according to an embodiment of the present invention;
12 is a diagram schematically illustrating a signal transmission / reception operation according to the IDMA-SWSC scheme in a wireless communication system according to an embodiment of the present invention;
13 is a diagram schematically illustrating an internal structure of a transmission apparatus supporting the IDMA-SWSC scheme in a wireless communication system according to an embodiment of the present invention;
14 is a diagram schematically illustrating an operation procedure of a signal receiving apparatus in a wireless communication system supporting the IDMA-SWSC scheme according to an embodiment of the present invention.
Throughout the drawings, it should be noted that like reference numerals are used to illustrate the same or similar elements and features and structures.

The following detailed description, which refers to the accompanying drawings, will serve to provide a comprehensive understanding of the various embodiments of the present disclosure, which are defined by the claims and the equivalents of the claims. The following detailed description includes various specific details for the sake of understanding, but will be considered as exemplary only. Accordingly, those skilled in the art will recognize that various changes and modifications of the various embodiments described herein may be made without departing from the scope and spirit of this disclosure. Furthermore, the descriptions of well-known functions and constructions may be omitted for clarity and conciseness.

The terms and words used in the following detailed description and in the claims are not intended to be limited to the literal sense, but merely to enable a clear and consistent understanding of the disclosure by the inventor. Thus, it will be apparent to those skilled in the art that the following detailed description of various embodiments of the disclosure is provided for illustrative purposes only, and that the present disclosure, as defined by the appended claims and equivalents of the claims, It should be clear that this is not provided for the sake of clarity.

Furthermore, it is to be understood that the singular forms "a" and "an" above, unless the context clearly dictates otherwise, include plural representations. Thus, in one example, a "component surface" includes one or more component representations.

Also, terms including ordinal numbers such as first, second, etc. may be used to describe various elements, but the elements are not limited to these terms. The terms are used only for the purpose of distinguishing one component from another. For example, without departing from the scope of the present invention, the first component may be referred to as a second component, and similarly, the second component may also be referred to as a first component. And / or < / RTI > includes any combination of a plurality of related listed items or any of a plurality of related listed items.

Also, the terminology used herein is for the purpose of describing particular embodiments only and is not intended to be limiting of the invention. The singular expressions include plural expressions unless the context clearly dictates otherwise. In this specification, the terms "comprises" or "having" and the like refer to the presence of stated features, integers, steps, operations, elements, components, or combinations thereof, But do not preclude the presence or addition of one or more other features, integers, steps, operations, elements, components, or combinations thereof.

Also, unless otherwise defined, all terms used herein, including technical or scientific terms, have the same meaning as commonly understood by one of ordinary skill in the art to which this invention belongs. Terms such as those defined in commonly used dictionaries should be understood to have a meaning consistent with the contextual meaning of the related art.

According to various embodiments of the invention, the electronic device may comprise a communication function. For example, the electronic device may be a smart phone, a tablet personal computer (PC), a mobile phone, a videophone, an e-book reader e a notebook PC, a netbook PC, a personal digital assistant (PDA), a portable personal computer (PC) A mobile multimedia device, a portable multimedia player (PMP), an MP3 player, a mobile medical device, a camera, a wearable device (e.g., a head- Electronic devices such as a head-mounted device (HMD), an electronic apparel, an electronic bracelet, an electronic necklace, an electronic app apparel, an electronic tattoo, or a smart watch ) And the like.

According to various embodiments of the present invention, the electronic device may be a smart home appliance having communication capabilities. For example, the smart home appliance includes a television, a digital video disk (DVD) player, audio, a refrigerator, an air conditioner, a vacuum cleaner, an oven, A microwave oven, a washer, a dryer, an air purifier, a set-top box, a TV box (for example, Samsung HomeSync ^™ , Apple TV ^™ or Google TV ^™ ) a gaming console, an electronic dictionary, a camcorder, an electrophotographic frame, and the like.

According to various embodiments of the present invention, the electronic device may be a medical device (e.g., magnetic resonance angiography (MRA) device, magnetic resonance imaging (CT) device, an imaging device, or an ultrasonic device), a navigation device, and a magnetic resonance imaging (MRI) , A global positioning system (GPS) receiver, an event data recorder (EDR), a flight data recorder a recorder (FDR), an automotive infotainment device, a navigation electronic device (e.g., a navigation navigation device, a gyroscope, Or a compass), an avionics device, a secure device, an industrial or consumer robot, and the like.

In accordance with various embodiments of the present invention, an electronic device includes a plurality of devices, including furniture, a portion of a building / structure, an electronic board, an electronic signature receiving device, a projector and various measurement devices (e.g., Water, electricity, gas or electromagnetic wave measuring devices), and the like.

According to various embodiments of the invention, the electronic device may be a combination of devices as described above. It should also be apparent to those skilled in the art that the electronic device according to the preferred embodiments of the present invention is not limited to the device as described above.

According to various embodiments of the present invention, the signal receiving device may be, for example, a user equipment (UE), and the signal transmitting device may be, for example, evolved node B: eNB, hereinafter referred to as "eNB").

In various embodiments of the present invention, the UE may be used in combination with terms such as a mobile station (MS), a wireless terminal, a mobile device, .

In various embodiments of the present invention, an eNB may include terms such as a base station (BS), a node ratio (node B), an access point (AP) Can be mixed.

An exemplary embodiment of the present invention provides a method and apparatus for performing a non-orthogonal multiple access (NOMA) scheme and a sliding window superposition coding (SWSC) scheme in a wireless communication system, And a method and apparatus for transmitting / receiving a signal based on the method.

In addition, an embodiment of the present invention proposes a signal transmitting / receiving apparatus and method for reducing interference based on the NOMA scheme and the SWSC scheme in a wireless communication system.

In addition, an embodiment of the present invention proposes a signal transmitting / receiving apparatus and method for improving performance based on the NOMA scheme and the SWSC scheme in a wireless communication system.

Meanwhile, an apparatus and method proposed in an embodiment of the present invention can be applied to a long-term evolution (LTE) mobile communication system, a long-term evolution (LTE) (LTE-A) mobile communication system and a licensed-assisted access (LAA) -LTE mobile communication system, , A high speed downlink packet access (HSDPA) mobile communication system, and a high speed uplink packet access (HSUPA) Speed packet data (hereinafter referred to as " HRPD ") of a 3rd generation partnership project 2 (3GPP2, hereinafter referred to as "3GPP2 & Mobile communication system, and 3GPP2 (WCDMA) mobile communication system and a 3GPP2 code division multiple access (CDMA) mobile communication system (hereinafter, referred to as "WCDMA " ) Mobile communication system, an IEEE 802.16m communication system, an IEEE 802.16e communication system, an evolved packet system (IEEE 802.16e communication system), an Institute of Electrical and Electronics Engineers system (hereinafter referred to as " EPS "), a mobile internet protocol (hereinafter referred to as" Mobile IP ") system, a digital multimedia broadcasting Service, a digital video broadcasting-handheld (DVP-H, hereinafter referred to as "DVP-H"), and a mobile / A mobile broadcasting service such as an advanced television systems committee-mobile / handheld (ATSC-M / H) service and an internet protocol television (IPTV) Various communication systems such as a digital video broadcasting system such as an IPTV service and a moving picture experts group (MPEG) media transport (MMT) system, Lt; / RTI >

First, an interference environment to which the SWSC scheme is applied in a wireless communication system according to an embodiment of the present invention will be described with reference to FIG.

1 is a diagram schematically illustrating an interference environment to which an SWSC scheme is applied in a wireless communication system according to an embodiment of the present invention.

Referring to FIG. 1, the SWSC scheme is a scheme for reducing the influence of an interference signal caused by an adjacent cell in a cellular network. In the wireless communication system, the eNB # 1 100 manages the cell # 1 110, the eNB # 2 101 manages the cell # 2 111, and the eNB # 112).

The UE # 1 120 receives a signal transmitted by each of the eNB # 1 100 and the eNB # 3 102. The UE # 2 121 receives a signal transmitted from the eNB # . In this case, the UE # 2 121 receives not only the signals transmitted by the eNB # 2 101 but also the signals transmitted by the eNB # 1 100 and the eNB # 3 102, A signal transmitted from each of the UE # 1 100 and the eNB # 3 102 acts as an interference to the UE # 2 121.

FIG. 1 illustrates an interference environment in which a SWSC scheme is applied in a wireless communication system according to an embodiment of the present invention. Referring to FIG. 2, in a wireless communication system according to an exemplary embodiment of the present invention, The transmission and reception operations will be described.

2 is a diagram schematically illustrating transmission and reception operations according to the SWSC scheme in a wireless communication system according to an embodiment of the present invention.

Referring to FIG. 2, two signal transmitting apparatuses, for example, two eNBs and two signal receiving apparatuses, for example, two UEs, perform transmitting and receiving operations according to the SWSC scheme As an example, transmission and reception operations according to the SWSC scheme will be described, but depending on the coordination of the network, one or more signal transmission devices and / or one or more signal reception devices may transmit and receive according to the SWSC scheme It is of course possible to participate in the operation. In FIG. 2, it is assumed that the same message is transmitted through two blocks, and the window size is 2.

2, the first two eNB, one example S1 (210), made on the assumption La S2 (215), each X _1, X ₂ a signal for transmission, with two UE, For example R1 (220 ), it will be assumed as R2 (225), each Y _1, Y ₂ signals that it receives. Every block 205, the eNB S1 (210) generates a signal X ₁ and coded according to the superposition coding scheme by a message to the two codes U and V to be transmitted and the eNB S2 (215) is to transmit It generates a signal X _2, which includes a message. Here, each message to be transmitted may be at least one packet or a protocol data unit (PDU), for example.

Specifically, in block 1, the eNB S1 210 sends a message known to both the eNB S1 210 and the UEs (shown as "1" for convenience) And generates a codeword V (1) by coding the message m ₁₁ to be transmitted in the block 1 on the basis of the code V. The codeword V (1) Then, the eNB S1 210 outputs the codeword X ₁ (1) generated by superposing the U (1) and V (1) to the next stage (modulator, multiplexer, etc.) So that a signal including the codeword X ₁ (1) is transmitted to the UEs during the block 1. In addition, by outputting the codeword X ₂ (1) comprising a message m ₂₁ to the eNB S2 (215) will be transmitted in the block 1 from the encoder to the next stage by a signal including a message m ₂₁ to be transmitted to the UE do.

Further, the block 2 (block 2) in the eNB S1 (210) generates a previous message by coding the m ₁₁ based on the code U codeword U (2) sent to and to be transmitted in the block 2 by encoding the message m to ₂₂ V code to generate a code word V (2), and generates a code word X ₁ (2) by superimposing encoding the U (2) and V (2). Then, the eNB S1 210 transmits the generated codeword X ₁ (2). In block 2, the eNB S2 215 transmits a codeword X ₂ (2) containing messages m ₂₂ to be transmitted to the UEs.

In this manner, messages are transmitted during (b-1) blocks, and in the last block block b, the eNB S1 210 transmits the previously transmitted message m _{1, b -1} to the code U And generates a code word V (b) by coding a known message " 1 "on the basis of the code V, and outputs U (b) and V And transmits the generated code word X ₁ (b) by superposition coding. In block b, the eNB S2 215 transmits a codeword X ₂ (b) including a message m _2b to be transmitted.

In the two codes, that is, overlapping a code U as the code V, was the transmission signal of the transmitter S1 (210) describes an example produced by the X ₁ = f (U, V), each UE has two blocks It is possible to perform the sliding window decoding operation using the signals received in superposition. That is, UE R1 cancels the codeword U (1) using the known message "1 " based on the received signals Y ₁ (1) and Y ₁ V (1) regards it as noise, thereby detecting X ₂ (1) which is an interference to the UE R 1.

Next, the UE R1 is and eliminate the U (1) using, known message "1" from the received signal and removes the detected signal _{X 2 (1), V (} 2) and X ₂ ( 2) as a noise, thereby detecting a desired signal [V (1) U (2)]. The message m ₁₁ can be recovered from the detected signal.

Similarly, when the received signal Y ₁ (3) of block 3 arrives, the UE R 1 uses the previously detected codeword U (2) instead of the known message "1 & by repeating the similar operation can recover the desired message ₁₂ m. That is, since the codeword U (2) has already been detected in the block 2, U (2) in the block 3 operates as a known message.

Likewise, in subsequent blocks, the UE Rl may detect the desired messages. When the received signal Y ₁ (b) arrives at the block b which is the last block, the UE R 1 removes U (b-1) using the previously detected codeword U (b- by removing the V (b) to detect the desired signal by using the [V (b-1) U (b)] to recover the message m _{1, b -1.}

The UE R2 detects the desired signal of the UE 1 as an interference signal in a manner similar to the UE R1 and detects the desired signal of the UE R2 by removing the detected interference signal from the received signals.

Specifically, the UE R2 removes the codeword U (1) using the known message "1" when the received signals Y ₂ (1) and Y ₂ and, X ₂ (1) and V (2) and X _{2 (2)} to a by regarding the noise, the detection of the [V (1) U (2 )] the interference signal to the UE R2 restore the message m ₁₁ (For convenience, the recovered message m ₁₁ is denoted hat_m ₁₁ in FIG. 2). Wherein in step UE R2 is behind the removal of the V (1) detected in the previous block using the message m ₁₁ by using the message "1" is known from the received signal, by detecting the X ₂ (1) message m ₂₁ .

Likewise, in subsequent blocks, the UE R2 can detect the desired messages. When the received signal Y ₁ (b) arrives at the block b, which is the last block, the UE R2 performs a decoding operation on the received signals of the last two blocks using the previously detected codeword V (b) .

In order to operate the SWSC scheme in a cellular environment, one of the eNBs or a separate network entity (not shown) may operate as a coordinator. The coordinator performs a co-scheduling operation between eNBs, determines a UE pair to which the superposition coding scheme is to be applied in consideration of a capacity region, Provides signaling information for the SWSC scheme, and can control the feedback operation and the retransmission operation for the SWSC transmission.

Meanwhile, the above-described SWSC scheme achieves a theoretical threshold performance in the physical layer in an additive white Gaussian noise (AWGN) interference environment without fading Which is relatively high efficiency.

However, since the SWSC scheme does not consider overlapped transmission between UEs in a cell, it may be difficult to obtain a performance gain when the SWSC scheme is used in a wireless communication system supporting the NOMA scheme.

Therefore, an embodiment of the present invention proposes an apparatus and method for efficiently transmitting / receiving signals by combining the NOMA scheme and the SWSC scheme, and will be described in detail as follows.

In one embodiment of the present invention, three NOMA schemes, i.e., a power domain NOMA (hereinafter referred to as a power domain NOMA) scheme and an interleaver division multiple access (IDMA) scheme and a sparse code multiple access scheme (SCMA) scheme will be considered. For convenience of explanation, a scheme combining the power domain NOMA scheme and the SWSC scheme will be referred to as a " power domain NOMA-SWSC scheme ", and a scheme combining the IDMA scheme and the SWSC scheme will be referred to as " Scheme and the SWSC scheme will be referred to as "SCMA-SWSC scheme ". Also, in an embodiment of the present invention, a low density signature-OFDM (LDS-OFDM) scheme may be used instead of the SCMA scheme.

First, a power domain NOMA-SWSC scheme in a wireless communication system according to an embodiment of the present invention will be described.

3, a signal transmission / reception operation according to a power domain NOMA-SWSC scheme in a wireless communication system according to an embodiment of the present invention will be described.

3 is a diagram schematically illustrating a signal transmission / reception operation according to a power domain NOMA-SWSC scheme in a wireless communication system according to an embodiment of the present invention.

3, the wireless communication system includes a plurality of eNBs, for example, two eNBs, eNB # 1 310, eNB # 2 320 and a plurality of UEs, UEs, for example, UE # 1 331, UE # 2 332, and UE # 3 333. The eNB # 1 310 is a serving eNB for the UE # 1 331 and the eNB # 2 320 is a serving eNB for the eNB # Is an interference eNB for transmitting an interference signal to the UE # 1 (331).

Also, the UE # 1 331 and the UE # 2 332 are NOMA paired UEs (hereinafter referred to as "NOMA paired UEs") paired based on a NOMA scheme, The UE # 1 331 and the UE # 3 333 are SWSC paired UEs (hereinafter referred to as "SWSC paired UEs") paired based on the SWSC scheme. That is, the UE # 1 331 and the UE # 2 332 constitute a NOMA pair (hereinafter referred to as a "NOMA pair"), and the UE # 1 331 and the UE # (Hereinafter referred to as "SWSC pair").

In order to support the power domain NOMA-SWSC scheme according to an embodiment of the present invention, the structure and operation process of each of the signal transmitting apparatus, for example, the eNB and the signal receiving apparatus, for example, the UE must be changed. As follows.

First, the structure and operation process of the eNB supporting the power domain NOMA-SWSC scheme according to an embodiment of the present invention will be described as follows.

First, the eNB must reflect the output characteristics of the SWSC encoder to the normal power domain NOMA scheme. That is, the SWSC encoder output must be able to be detected in UE # 2 332 which is a near UE (hereinafter referred to as "near UE") adjacent to eNB # 1 310 serving as a serving eNB, When performing the SWSC decoding operation in UE # 1 331 which is far UE (hereinafter referred to as far UE) far from UE # 1 310, the strength of the signal to UE # 2 332 is very strong Small, for example, less than the critical intensity. In the embodiment of the present invention, the near UE and the far eNB are set based on the distance from the eNB. However, the near UE and the far eNB may be set considering not only the distance from the eNB but also various parameters And a detailed description thereof will be omitted here. As an example, the far eNB may be a UE located in a cell boundary region.

Therefore, the eNB must determine the UE pairing, the parameter b, and the modulation order in consideration of the conditions described above, and also change the scheduling process for the UEs. Herein, the parameter b represents a parameter used for the power domain NOMA scheme. For example, the transmission power split ratio (transmission power split ratio), which is the ratio of the transmission power of the superposed signal to the UE's transmission power, coefficient: TPSC, hereinafter referred to as "TPSC"). Here, the remaining UEs other than the UE are included in a UE pair according to the power domain NOMA scheme, that is, a power domain NOMA pair.

Next, the signal receiving apparatus, for example, the UE, must reflect the SWSC decoding operation in the normal power domain NOMA scheme. That is, the UE supporting the power domain NOMA-SWSC scheme combining the SWSC scheme and the power domain NOMA scheme must apply the power domain NOMA decoding operation when performing the SWSC decoding operation.

Therefore, in the power domain NOMA-SWSC scheme according to an embodiment of the present invention, the eNB must provide the UE with the following information.

First, the information provided to the far UE is as follows.

(1) When the SWSC scheme is applied to the far UE, information indicating whether a power domain NOMA scheme is applied to a UE paired with the far UE based on the SWSC scheme

3, the far UE is UE # 1 331 and the UE paired with the UE # 1 331 based on the SWSC scheme is UE # 3 333.

(2) When a power domain NOMA scheme is applied to a UE paired with a far UE, information about a power domain NOMA scheme applied to a UE paired with the far UE

The receiving operation when the power domain NOMA scheme is applied to UEs paired with the far UE will be described below with reference to FIG. 5, and a detailed description thereof will be omitted here.

Second, the information provided to the near UE is as follows.

(1) Information indicating whether the SWSC scheme is applied to far UE

(2) When the SWSC scheme is applied to the far UE, information related to a sliding window

The information related to the sliding window may include a length and parameter a to which the sliding window overlaps. Here, the parameter a represents a weight factor used in the SWSC scheme.

The information provided to the near UE may affect the near UE detecting the signal for the far UE and estimating the modulation order applied to the far UE.

Meanwhile, a scheduling scheme according to the power domain NOMA-SWSC scheme according to an embodiment of the present invention will be described as follows.

Before describing the scheduling scheme according to the power domain NOMA-SWSC scheme according to an embodiment of the present invention, a general scheduling scheme according to the power domain NOMA scheme will be described below.

First, the eNB considers the candidate power ratio, modulation and coding scheme (MCS) level (hereinafter referred to as " MCS ") level, And a power domain NOMA pair with the highest throughput computed based on the metric (similar to the metric).

Meanwhile, in the scheduling scheme according to the power domain NOMA-SWSC scheme according to an embodiment of the present invention, the eNB considers all candidate power ratios and MCS levels for UEs in the cell and UE candidates for applying the SWSC scheme, Select the power domain NOMA-SWSC pair with the highest throughput calculated based on capacity (or a similar metric to the capacity). As an example, for the far UE, a power domain NOMA-SWSC pair is generated such that the signal of the near UE can be received with an intensity below the threshold strength. This is to satisfy a high signal-to-noise ratio (SNR) condition when the SWSC scheme is applied.

Hereinafter, an internal structure of a transmitter supporting the power domain NOMA-SWSC scheme in a wireless communication system according to an embodiment of the present invention will be described with reference to FIG.

4 is a diagram schematically illustrating an internal structure of a transmission apparatus supporting a power domain NOMA-SWSC scheme in a wireless communication system according to an embodiment of the present invention.

4, an eNB includes a SWSC encoder 410, an adder 420, a turbo encoder 430, a modulator 440, and a symbol generator 450, . Here, the modulator 440 is based on a quadrature amplitude modulation (QAM) scheme.

The SWSC encoder 410 includes a plurality of short turbo encoders, for example, a short turbo encoder # 1 411-1, a short turbo encoder # 2 411-2, For example, a modulator # 1 413-1, a modulator # 2 413-2 and the like, a delay unit 415 and a plurality of adders, for example, an adder # 1 417-1, An adder # 2 417-2, and the like, and a symbol generator 419. [ The plurality of modulators perform a modulation operation based on the QAM scheme.

In FIG. 4, the parameter a represents a weight coefficient used in the SWSC scheme, the parameter b is a parameter used in the power domain NOMA scheme, for example, TPSC, and a detailed description of the parameter a and the parameter b is omitted do.

Signals to be transmitted to the far UE, e.g., UE # 1, are input to the SWSC encoder 410, so that the signals are input to the multiple short turbo encoders, Encoded according to a short turbo encoding scheme, and the encoded signal is output to each of the plurality of modulators.

The plurality of modulators respectively modulate the signal output from the corresponding short turbo encoder according to the QAM scheme. Then, the modulator # 1 413-1 outputs the modulated signal to the adder # 1 417-1, and the modulator # 2 413-2 outputs the modulated signal to the delay unit 415). The delay unit 415 delays the signal output from the modulator # 2 413-2 by a predetermined time and outputs the delayed signal to the adder # 2 417-2.

The plurality of adders perform an add operation corresponding to the parameter a, respectively, and output the added signals to the symbol generator 419. The symbol generator 419 generates a symbol for the UE # 1, that is, a QAM symbol, and outputs the symbol to the adder 420.

Meanwhile, a signal to be transmitted to a near UE, for example, UE # 2, is input to the turbo encoder 430. The turbo encoder 430 encodes the signal according to the turbo encoding scheme, And outputs it to the modulator 440. The modulator 440 modulates the signal output from the turbo encoder 430 according to the QAM scheme and outputs the modulated signal to the symbol generator 450. The symbol generator 450 generates a symbol for the UE # 2, that is, a QAM symbol, and outputs the symbol to the adder 420.

The adder 420 adds the signal output from the symbol generator 419 and the signal output from the symbol generator 450 based on the parameter b to generate a serving eNB signal, I.e. to UE # 1 and UE # 2.

4 shows a case where the SWSC encoder 410, the adder 420, the turbo encoder 430, the modulator 440, and the symbol generator 450 are implemented as separate units At least two of the SWSC encoder 410, the adder 420, the turbo encoder 430, the modulator 440, and the symbol generator 450 may be integrated. It is needless to say that the SWSC encoder 410, the adder 420, the turbo encoder 430, the modulator 440, and the symbol generator 450 may be implemented by a single processor.

FIG. 4 illustrates an internal structure of a transmission apparatus supporting a power domain NOMA-SWSC scheme in a wireless communication system according to an embodiment of the present invention. Referring to FIG. 5, An operation procedure of a receiving apparatus supporting the power domain NOMA-SWSC scheme in a communication system will be described.

5 is a diagram schematically illustrating an operation procedure of a receiving apparatus supporting a power domain NOMA-SWSC scheme in a wireless communication system according to an embodiment of the present invention.

Referring to FIG. 5, it should be noted that the operation procedure of the receiving apparatus shown in FIG. 5 is an operation procedure of a UE existing in the same environment as the UE # 1 331 shown in FIG.

First, when transmitting on the basis of a power domain NOMA-SWSC scheme in a transmitting apparatus, for example, an eNB, the UE # 1 transmits a UE # 1 signal, which is a signal targeting the UE # 1, And a UE # 3 signal, which is a signal targeting the UE # 3 constituting the SWSC pair, together with the UE # 2 signal which is a signal targeting the UE # 2 constituting the SWSC pair. Here, the UE # 3 signal acts as a downlink interference (DI) signal for the UE # 1. In addition, since the SWSC scheme is applied to the UE # 1 signal and the UE # 3 signal, it can be seen that the UE # 1 signal and the UE # 3 signal are generated by overlapping a plurality of signals based on the weight coefficient.

Therefore, the UE # 1 performs a decoding operation corresponding to the power domain NOMA scheme for the UE # 1 signal and the UE # 2 signal, and performs decoding corresponding to the SWSC scheme for the UE # 1 signal and the UE # And performs an operation. Also, the decoding operation of the UE # 1 may include information indicating whether a power domain NOMA scheme is applied to a UE paired with the UE # 1 in the SWSC encoding scheme, i.e., the UE # 3, provided by the eNB , And the power domain NOMA scheme is applied to the UE # 3, based on the applied power domain NOMA scheme information.

FIG. 5 illustrates an operation procedure of a receiving apparatus supporting a power domain NOMA-SWSC scheme in a wireless communication system according to an embodiment of the present invention. Referring to FIG. 6, domain The operation procedure of a near UE in a wireless communication system supporting the NOMA-SWSC scheme will be described.

6 is a diagram schematically illustrating an operation procedure of a near UE in a wireless communication system supporting a power domain NOMA-SWSC scheme according to an embodiment of the present invention.

Referring to FIG. 6, the near UE first receives information indicating whether the SWSC scheme is applied to the far UE from the transmitting apparatus, for example, the far UE from the eNB, and information related to the sliding window when the SWSC scheme is applied to the far UE.

The operation procedure of the near UE shown in FIG. 6 is an operation procedure of a UE existing in the same environment as the UE # 2 332 shown in FIG. 3. The signal received from the near UE by the near UE is shown in FIG. 5 It will be assumed that it has the same form as shown in Fig.

Accordingly, the near UE, i.e., the UE # 2 332, when a signal is received as shown in FIG. 5, can perform interference cancellation (IC) on the far UE signal, (Hereinafter referred to as "IC") operation (operation 610). Hereinafter, the IC operation for the far UE signal will be described in detail.

5, the UE # 2 332 detects and decodes a signal corresponding to a reference number 511 of the UE # 1 signal, that is, the target signal # 1 (step 611) , And removes the target signal # 1 from the received signal (step 612). Then, the UE # 2 332 detects and decodes a signal corresponding to a reference number 513, that is, the target signal # 2, in the received signal in step 613, and outputs the target signal # 1 and the target signal # # 2 is removed (step 614).

When the IC operation for the far UE is completed in this way, the UE # 2 332 determines a log likelihood ratio (LLR) for the near UE signal, i.e., the UE # 2 signal (Step 620).

Then, the UE # 2 332 performs a turbo decoding operation on the UE # 2 signal (operation 630).

6, an operation procedure of a near UE in a wireless communication system supporting a power domain NOMA-SWSC scheme according to an embodiment of the present invention is described. Next, referring to FIG. 7, domain The operation procedure of the far UE in a wireless communication system supporting the NOMA-SWSC scheme will be described.

FIG. 7 is a diagram schematically illustrating an operation procedure of a far UE in a wireless communication system supporting a power domain NOMA-SWSC scheme according to an embodiment of the present invention.

Referring to FIG. 7, when the SWSC encoding scheme is applied to the far UE from the transmitting apparatus, for example, the far UE from the eNB, the far UE determines whether the power domain NOMA scheme is applied to the UE paired with the far UE in the SWSC encoding scheme And information about the applied NOMA scheme when the power domain NOMA scheme is applied to the UE paired with the far UE.

The operation procedure of the far UE shown in FIG. 7 is an operation process of a UE existing in the same environment as the UE # 1 331 shown in FIG. 3. The signal received from the far UE by the eNB is shown in FIG. It will be assumed that it has the same form as shown in Fig.

5, the far UE, that is, the UE # 1 331, receives a far UE signal, that is, a signal corresponding to a reference number 511 in the UE # 1 signal, that is, a target signal # 1 in step 710, and removes the target signal # 1 from the received signal in step 720. Then, the UE # 1 331 detects and decodes a signal corresponding to the reference number 515 of the received signal, that is, the DI signal # 1 (step 730), and outputs the target signal # 1 and the DI signal # 1 is removed (step 740). Here, the operation of detecting and decoding the target signal # 1 is as follows.

First, the UE # 1 331 calculates an LLR for the UE # 1 signal (step 711), and performs a turbo decoding operation on the UE # 1 signal (step 712).

Second, the SCMA-SWSC scheme in a wireless communication system according to an embodiment of the present invention will be described.

8 is a diagram schematically illustrating a signal transmission / reception operation according to the SCMA-SWSC scheme in a wireless communication system according to an embodiment of the present invention.

8, the wireless communication system includes a plurality of eNBs, for example, two eNBs, eNB # 1 810, eNB # 2 820 and a plurality of UEs, UEs, for example, UE # 1 831, UE # 2 832, UE # 3 833, and UE # 4 834. The eNB # 1 810 is a serving eNB for the UE # 1 831 and the eNB # 2 820 is a serving eNB for the UE # Is an interference eNB for transmitting an interference signal to the UE # 1 (831).

Also, the UE # 1 831 and UE # 2 832 are SCMA paired UEs paired based on the SCMA scheme, and the UE # 1 831 and the UE # 3 833 are paired based on the SWSC scheme. SWSC paired UEs. Also, UE # 3 833 and UE # 4 834 are SCMA paired UEs also paired based on the SCMA scheme. That is, the UE # 1 831 and the UE # 2 832 constitute an SCMA pair in FIG. 8, and the UE # 1 831 and the UE # 3 833 constitute an SWSC pair. 833 and UE # 4 834 form an SCMA pair.

In order to support the SCMA-SWSC scheme according to an embodiment of the present invention, the structure and operation process of each of the transmitting apparatus, for example, the eNB and the receiving apparatus, for example, the UE, should be changed.

First, the structure and operation process of a transmission apparatus supporting the SCMA-SWSC scheme according to an embodiment of the present invention will be described.

First, the transmitting apparatus, for example, the eNB, must reflect the output characteristics of the SWSC encoder in a general SCMA scheme. That is, the UE # 1 signal to which the SWSC encoding scheme is applied should be included in the SCMA codebook. Therefore, in an embodiment of the present invention, it is necessary to change the structure of UE # 1 in consideration of the conditions described above.

Further, in one embodiment of the present invention, detection performance of UE # 1 to which an SCMA codebook is applied in SWSC UE pairing needs to be considered, and an SCMA codebook is applied to UE # 3, which is an interference UE for UE # 1 Can be considered.

Next, the receiving device, e.g., the UE, must reflect the SWSC decoding operation to the normal SCMA operation. That is, the UE supporting the SCMA-SWSC scheme combining the SWSC scheme and the SCMA scheme must apply the SCMA decoding operation when performing the SWSC decoding operation.

Accordingly, in the SCMA-SWSC scheme according to an embodiment of the present invention, the eNB must provide the UE with the following information. That is, the information provided to the far UE is as follows.

(1) When the SWSC scheme is applied to the far UE, information indicating whether or not the SCMA scheme is applied to the UE paired with the far UE in the SWSC scheme

8, the far UE is UE # 1 831, and the UE paired with the UE # 1 831 in the SWSC scheme is UE # 3 833. That is, the UE # 1 831 and the UE # 3 833 form an SWSC pair.

(2) When the SCMA scheme is applied to the UE # 3 833, information about the UE # 3 833 and the UE constituting the SCMA pair, that is, the UE # 4 834

Herein, the information on the UE # 4 834 includes an MCS level, a scrambling sequence, resource allocation information, and an SCMA codebook etc. applied to the UE # 3 833 and the UE # . ≪ / RTI >

Hereinafter, an internal structure of a transmission apparatus supporting the SCMA-SWSC scheme in a wireless communication system according to an embodiment of the present invention will be described with reference to FIG.

9 is a diagram schematically illustrating an internal structure of a transmission apparatus supporting the SCMA-SWSC scheme in a wireless communication system according to an embodiment of the present invention.

9, an eNB includes a SWSC encoder 910, an adder 920, a turbo encoder 930, a modulator 940, and a symbol generator 950. [ Here, the modulator 940 is based on an SCMA codebook-based modulation scheme.

The SWSC encoder 910 includes a plurality of short turbo encoders, for example, a short turbo encoder # 1 911-1, a short turbo encoder # 2 911-2, a delay unit 913, A symbol generator 915, and a symbol generator 917. Here, the modulator 915 performs a modulation operation based on the SCMA codebook-based modulation scheme.

In FIG. 9, the parameter b indicates a parameter used in the SCMA scheme, and a detailed description of the parameter b will be omitted.

Signals to be transmitted to the far UE, e.g., UE # 1, are input to the SWSC encoder 910 so that the signals are input to the multiple short turbo encoders, Encoding corresponding to the short turbo encoding scheme. For example, the short turbo encoder # 1 911-1 outputs the encoded signal to the modulator 915, and the short turbo encoder # 2 911-2 outputs the encoded signal to the delay unit 913). The delay unit 415 delays the signal output from the short turbo encoder # 2 911-2 by a predetermined time and outputs the delayed signal to the modulator 915. [

The modulator 915 modulates the signal output from the short turbo encoder # 1 911-1 and the signal output from the delay unit 913 based on the SCMA codebook-based modulation scheme, . The symbol generator 917 generates a symbol for the UE # 1, that is, an SCMA symbol, and outputs the symbol to the adder 920.

A signal to be transmitted to a near UE, for example, UE # 2, is input to the turbo encoder 930. The turbo encoder 930 encodes the signal according to the turbo encoding scheme, And outputs it to the modulator 940. The modulator 940 modulates the signal output from the turbo encoder 930 according to the SCMA codebook-based modulation scheme, and outputs the modulated signal to the symbol generator 950. The symbol generator 950 generates a symbol for the UE # 2, that is, an SCMA symbol, and outputs the symbol to the adder 920.

The adder 920 adds the signal output from the symbol generator 917 and the signal output from the symbol generator 950 based on the parameter b to generate a serving eNB signal, , I.e., to UE # 1 and UE # 2.

9 shows a case where the SWSC encoder 910, the adder 920, the turbo encoder 930, the modulator 940 and the symbol generator 950 are implemented as separate units At least two of the SWSC encoder 910, the adder 920, the turbo encoder 930, the modulator 940, and the symbol generator 950 may be integrated. It is needless to say that the SWSC encoder 910, the adder 920, the turbo encoder 930, the modulator 940, and the symbol generator 950 may be implemented as a single processor.

9, an internal structure of a transmission apparatus supporting the SCMA-SWSC scheme in a wireless communication system according to an embodiment of the present invention is described. Next, with reference to FIG. 10, an SCMA- An example of the operation of the receiving apparatus in the wireless communication system supporting the method will be described.

10 is a diagram schematically illustrating an example of an operation procedure of a receiving apparatus in a wireless communication system supporting an SCMA-SWSC scheme according to an embodiment of the present invention.

Referring to FIG. 10, it should be noted that the operation procedure of the reception apparatus shown in FIG. 10 is an operation procedure of a UE existing in the same environment as the UE # 1 831 shown in FIG.

First, when transmitting from a transmitting apparatus, for example, an eNB based on the SCMA-SWSC scheme, the UE # 1 transmits a UE # 1 signal, which is a signal targeting the UE # 1, and a UE # 2 signal and a UE # 3 signal, which is a signal targeting UE # 3 forming the SWSC pair, together with the UE # 2 signal. Here, the UE # 3 signal is a DI signal for the UE # 1. In addition, since the SWSC scheme is applied to the UE # 1 signal and the UE # 3 signal, the UE # 1 signal and the UE # 3 signal are multiplexed based on the parameters used in the SWSC scheme, Able to know.

Therefore, the UE # 1 performs a decoding operation corresponding to the SCMA scheme for the UE # 1 signal and the UE # 2 signal, and performs a decoding operation corresponding to the SWSC scheme for the UE # 1 signal and the UE # 3 signal . Then, the UE # 1 performs a decoding operation corresponding to the SCMA scheme for the UE # 3 signal and the UE # 4 signal.

10, an example of the operation of a receiving apparatus in a wireless communication system supporting an SCMA-SWSC scheme according to an embodiment of the present invention is described. Next, referring to FIG. 11, Another example of the operation procedure of the receiving apparatus in the wireless communication system supporting the SCMA-SWSC scheme will be described.

11 is a diagram schematically illustrating another example of the operation procedure of a receiving apparatus in a wireless communication system supporting an SCMA-SWSC scheme according to an embodiment of the present invention.

Referring to FIG. 11, a UE, for example, UE # 1 and UE # 2 receives information necessary for supporting a SCMA-SWSC scheme from a transmitting apparatus, for example, an eNB. For example, when the SWSC scheme is applied to the UE # 1, the far UE, i.e., the UE # 1, indicates whether or not the SCMA scheme is applied to the UE paired with the UE # 1 in the SWSC scheme, When the SCMA scheme is applied to UE # 3, UE # 3 and UE # 4, which form an SCMA pair, are received.

It is also assumed that the signal received by the UE # 1 from the eNB has a similar form as shown in FIG.

Accordingly, when a signal is received, the UE # 1 detects and decodes a signal corresponding to the reference number 1011 of the UE # 1 signal, that is, the target signal # 1 (step 1110), and removes the target signal # 1 from the received signal (Step 1120). Then, the UE # 1 detects and decodes the target signal # 2 corresponding to the reference number 1015 in the received signal (step 1130), and corresponds to the target signal # 1 and the target signal # 2 in the received signal (Step 1140).

Here, the operations of steps 1110 and 1130 are as follows.

First, the UE # 1 calculates an LLR for the UE # 1 signal and the UE # 2 signal (step 1111). Then, the UE # 1 performs a turbo decoding operation on the UE # 1 signal (step 1112-1), and performs a turbo decoding operation on the UE # 2 signal (step 1112-2). Here, the LLR calculation operation is based on a message passing algorithm.

Also, the UE # 1 calculates an LLR for the UE # 3 signal and the UE # 4 signal (step 1131). Then, the UE # 1 performs a turbo decoding operation on the UE # 3 signal (step 1132-1) and performs a turbo decoding operation on the UE # 4 signal (step 1132-2). Here, the LLR calculation operation is based on a message transfer algorithm.

Third, the IDMA-SWSC scheme in a wireless communication system according to an embodiment of the present invention will be described.

12 is a diagram schematically illustrating a signal transmission / reception operation according to the IDMA-SWSC scheme in a wireless communication system according to an embodiment of the present invention.

12, the wireless communication system includes a plurality of eNBs, for example, two eNBs, eNB # 1 1210, eNB # 2 1220 and a plurality of UEs, UEs, for example, UE # 1 1231, UE # 2 1232, UE # 3 1233, and UE # 4 1234. The eNB # 1 1210 is a serving eNB for the UE # 1 1231 and the eNB # 2 1220 is a serving eNB for the UE # 1 1231, Is an interference eNB for transmitting an interference signal to the UE # 1 1231. [

In addition, the UE # 1 1231 and the UE # 2 1232 are IDMA paired UEs paired based on the IDMA scheme, and the UE # 1 1231 and the UE # 3 1233 are paired based on the SWSC scheme. SWSC paired UEs. UE # 3 1233 and UE # 4 1234 are also IDMA paired UEs paired based on the IDMA scheme. That is, the UE # 1 1231 and the UE # 2 1232 constitute an IDMA pair, the UE # 1 1231 and the UE # 3 1233 constitute an SWSC pair, and the UE # 3 1233 And UE # 4 1234 form an IDMA pair.

In order to support the IDMA-SWSC scheme according to an embodiment of the present invention, the structure and operation process of each of the transmitting apparatus, for example, the eNB and the receiving apparatus, for example, the UE, should be changed.

First, the structure and operation process of a transmitting apparatus supporting the IDMA-SWSC scheme according to an embodiment of the present invention will be described.

First, the transmitting apparatus, for example, the eNB, must reflect the SWSC encoder output characteristic to the general IDMA method. That is, repetition and user-specific interleaving processes must be added to the SWSC encoding process, and it may be considered to apply different interleaving schemes in the short turbo encoding process used in the SWSC encoding process .

Therefore, in an embodiment of the present invention, it is necessary to change the structure of UE # 1 in consideration of the conditions described above.

Next, the receiving device, e.g., the UE, must reflect the SWSC decoding operation to the generic IDMA decoding operation. That is, the UE supporting the IDMA-SWSC scheme combining the SWSC scheme and the IDMA scheme must apply the SWSC decoding operation when performing the IDMA decoding operation.

Therefore, in the IDMA-SWSC scheme according to an embodiment of the present invention, the eNB must provide the UE with the following information.

(1) Information indicating whether or not the IDMA scheme is applied to the UE # 3 constituting the UE # 1 and the SWSC pair

(2) When the IDMA scheme is applied to UE # 3, information on UE # 3 and UE # 4 constituting the IDMA pair

The information on the UE # 4 includes information on the MCS level, the scrambling sequence, the resource allocation information, and the IDMA scheme applied to the UE # 3 and the UE # 4, for example, the number of repetitions and the interleaving pattern ), And the like.

Hereinafter, an internal structure of a transmitter supporting the IDMA-SWSC scheme in a wireless communication system according to an embodiment of the present invention will be described with reference to FIG.

13 is a diagram schematically illustrating an internal structure of a transmission apparatus supporting the IDMA-SWSC scheme in a wireless communication system according to an embodiment of the present invention.

13, an eNB includes a SWSC encoder 1310, an adder 1320, a turbo encoder 1330, a modulator 1340, and a symbol generator 1350, for example. Here, the modulator 1340 is based on the IDMA scheme.

The SWSC encoder 1310 includes a plurality of short turbo encoders, for example, a short turbo encoder # 1 1311-1, a short turbo encoder # 2 1311-2, etc., and a plurality of modulators, The adder # 1 1313-1, the modulator # 2 1313-2 and the like and a plurality of adders such as an adder # 1 1315-1, an adder # 2 1315-2, ). The plurality of modulators perform a modulation operation based on the IDMA scheme.

13, the parameter a indicates a parameter used in the SWSC scheme, for example, a weight coefficient, and the parameter b indicates a parameter used in the IDMA scheme, and a detailed description of the parameter a and the parameter b will be omitted.

Signals to be transmitted to the far UE, e.g., UE # 1, are input to the SWSC encoder 1310 so that the signals are input to the multiple short turbo encoders, Encoded according to a short turbo encoding scheme, and the encoded signal is output to each of the plurality of modulators.

The plurality of modulators respectively modulate the signal output from the corresponding short turbo encoder according to the IDMA scheme. Then, the modulator # 1 1313-1 outputs the modulated signal to the adder # 1 1315-1, and the modulator # 2 1313-2 adds the modulated signal to the adder # (1315-2). Here, the internal structure and operation of each of the plurality of modulators, for example, the modulator # 1 1313-1 and the modulator # 2 1313-2 are similar to the internal structure and operation of the modulator 1340 described below , So that detailed description thereof will be omitted here.

The plurality of adders perform an add operation corresponding to the parameter a, respectively, and output the added signals to the symbol generator 1317. The symbol generator 1317 generates a symbol for the UE # 1, that is, an IDMA symbol, and outputs the symbol to the adder 1320.

Meanwhile, a signal to be transmitted to a near UE, for example, UE # 2, is input to the turbo encoder 1330. The turbo encoder 1330 encodes the signal according to the turbo encoding scheme, And outputs it to the modulator 1340. The modulator 1340 modulates the signal output from the turbo encoder 1330 according to the IDMA scheme and outputs the modulated signal to the symbol generator 1350. The symbol generator 1350 generates a symbol for the UE # 2, that is, an IDMA symbol, and outputs the symbol to the adder 1320.

The adder 1320 adds the signal output from the symbol generator 1317 and the signal output from the symbol generator 1350 based on the parameter b to generate a serving eNB signal, I.e. to UE # 1 and UE # 2.

13, the SWSC encoder 1310, the adder 1320, the turbo encoder 1330, the modulator 1340, and the symbol generator 1350 are implemented as separate units At least two of the SWSC encoder 1310, the adder 1320, the turbo encoder 1330, the modulator 1340, and the symbol generator 1350 may be integrated. It is needless to say that the SWSC SWSC encoder 1310, the adder 1320, the turbo encoder 1330, the modulator 1340 and the symbol generator 1350 may be implemented by a single processor.

Meanwhile, the operation of the receiver supporting the IDMA scheme in the wireless communication system according to the embodiment of the present invention is similar to the operation of the receiver illustrated in FIG. That is, when a signal is transmitted from a transmitting apparatus, for example, an eNB based on the IDMA scheme, the UE # 1 transmits a UE # 1 signal, which is a signal targeting the UE # 1, and a UE # 2 signal and a UE # 3 signal, which is a signal targeting UE # 3 forming the SWSC pair, together with the UE # 2 signal. Here, the UE # 3 signal is a DI signal for the UE # 1. In addition, since the SWSC scheme is applied to the UE # 1 signal and the UE # 3 signal, it can be seen that the UE # 1 signal and the UE # 3 signal are overlapped with each other based on the parameter a.

Therefore, the UE # 1 performs a decoding operation corresponding to the IDMA scheme for the UE # 1 signal and the UE # 2 signal, and performs a decoding operation corresponding to the SWSC scheme for the UE # 1 signal and the UE # 3 signal . In addition, the UE # 1 performs a decoding operation corresponding to the IDMA scheme on the signal of the UE # 4 constituting the NOMA pair with the UE # 3.

In addition, the decoding operation of the UE # 1 includes information indicating whether the IDMA scheme is applied to the UE, which is paired with the UE # 1 in the information provided by the eNB, i.e., the SWSC scheme, If the IDMA scheme is applied to the UE # 3, the information on the UE # 3 constituting the IDMA pair with the UE # 3, i.e., the MCS level applied to the UE # 4, the scrambling sequence and the resource allocation information, Information on the IDMA scheme applied to the UE # 3 and the UE # 4, that is, the repetition count, the interleaving pattern, and the like.

Next, the operation of the signal receiving apparatus in the wireless communication system supporting the IDMA-SWSC scheme according to the embodiment of the present invention will be described with reference to FIG.

14 is a diagram schematically illustrating an operation procedure of a signal receiving apparatus in a wireless communication system supporting the IDMA-SWSC scheme according to an embodiment of the present invention.

14, an IDMA method is applied to a signal receiving apparatus, for example, far UE, that is, UE # 1, for a transmitting apparatus, for example, a UE constituting a far UE and an SWSC pair from eNB # 1, And if the IDMA scheme is applied to the UE # 3, information on the UE # 3 and the UE configuring the IDMA pair in the interference eNB, i.e., the eNB # 2, i.e., the UE # 4 is received.

The operation procedure of the far UE shown in FIG. 14 is an operation process of a UE existing in the same environment as the UE # 1 1231 shown in FIG. 12, and the signal received by the far UE from the eNB is shown in FIG. It will be assumed that it has the same form as shown in Fig.

Therefore, when the far UE, i.e., the UE # 1 1231 receives a signal as shown in FIG. 5, the far UE, that is, the UE # 1 1231 receives the signal through an elementary signal estimator (ESE) Performs an estimation operation on the received signal (step 1410), and performs a user-specific deinterleaving operation on the estimated signal, i.e., a user-specific deinterleaving operation corresponding to the interleaving pattern for UE # 2 1232 (step 1420) step). Then, the UE # 1 1231 decodes the turbo decoding scheme for the user-deinterleaved signal and outputs the turbo decoded signal in step 1430. The turbo decoded signal is input to the ESE.

In step 1440, the UE # 1 1231 performs a user-specific deinterleaving operation on the estimated signal, that is, a user-specific deinterleaving operation corresponding to an interleaving pattern for the UE # 1 1231. Then, the UE # 1 1231 decodes the SWSC-based turbo decoding scheme for the user-specific deinterleaved signal and outputs the SWSC-based turbo decoded signal in step 1450. The SWSC-based turbo decoded signal is input to the ESE.

Hereinafter, the SWSC-based turbo decoding method will be described in detail.

5, the UE # 1 1231 detects and decodes a far UE signal, that is, a signal corresponding to a reference number 511 of the UE # 1 signal, that is, the target signal # 1 (Step 1451), and removes the target signal # 1 from the received signal (step 1453). Then, the UE # 1 331 detects and decodes a signal corresponding to the reference number 515 of the received signal, that is, the DI signal # 1 (step 1455), and outputs the target signal # 1 and the DI signal # 1 is removed (Step 1457).

Certain aspects of the invention may also be implemented as computer readable code in a computer readable recording medium. The computer readable recording medium is any data storage device capable of storing data that can be read by a computer system. Examples of the computer-readable recording medium include a read-only memory (ROM), a random-access memory (RAM), CD-ROMs, magnetic tapes , Floppy disks, optical data storage devices, and carrier waves (such as data transmission over the Internet). The computer readable recording medium may also be distributed over networked computer systems, and thus the computer readable code is stored and executed in a distributed manner. Also, functional programs, code, and code segments for accomplishing the present invention may be readily interpreted by programmers skilled in the art to which the invention applies.

It will also be appreciated that the apparatus and method according to an embodiment of the present invention may be implemented in hardware, software, or a combination of hardware and software. Such arbitrary software may be stored in a memory such as, for example, a volatile or non-volatile storage device such as a storage device such as ROM or the like, or a memory such as a RAM, a memory chip, a device or an integrated circuit, , Or a storage medium readable by a machine (e.g., a computer), such as a CD, a DVD, a magnetic disk, or a magnetic tape, as well as being optically or magnetically recordable. The method according to an embodiment of the present invention can be implemented by a computer or a mobile terminal including a control unit and a memory and the memory is suitable for storing a program or programs including instructions embodying the embodiments of the present invention It is an example of a machine-readable storage medium.

Accordingly, the invention includes a program comprising code for implementing the apparatus or method as claimed in any of the claims herein, and a storage medium readable by a machine (such as a computer) for storing such a program. In addition, such a program may be electronically transferred through any medium, such as a communication signal carried over a wired or wireless connection, and the present invention appropriately includes equivalents thereof

Also, an apparatus according to an embodiment of the present invention may receive and store the program from a program providing apparatus connected by wire or wireless. The program providing apparatus includes a memory for storing a program including instructions for causing the program processing apparatus to perform a predetermined content protection method, information necessary for the content protection method, and the like, and a wired or wireless communication with the graphics processing apparatus And a control unit for transmitting the program to the transceiver upon request or automatically by the graphic processing apparatus.

While the present invention has been described in connection with what is presently considered to be practical exemplary embodiments, it is to be understood that the invention is not limited to the disclosed embodiments, but, on the contrary, Therefore, the scope of the present invention should not be limited by the illustrated embodiments, but should be determined by the scope of the appended claims and equivalents thereof.

Claims (20)

A method of operating a transmitting device in a wireless communication system,
When a sliding window superposition coding scheme is applied to a first receiving apparatus, a non-orthogonal multiple access (NOMA) method is applied to a second receiving apparatus that is paired with the first receiving apparatus To the first receiving apparatus, second information that is information related to the NOMA scheme when the NOMA scheme is applied to the second receiving apparatus, A method of operating a transmitting device in a wireless communication system.
The method according to claim 1,
Further comprising the step of transmitting third information indicating whether the SWSC scheme is applied to the first receiving apparatus and fourth information being information related to the SWSC scheme to the third receiving apparatus The method comprising the steps of:
3. The method of claim 2,
Wherein the NOMA scheme is a power domain NOMA scheme.
3. The method of claim 2,
Wherein the third receiving apparatus is paired with the first receiving apparatus based on the NOMA scheme in a service area in which the transmitting apparatus provides a service.
3. The method of claim 2,
Wherein the fourth information includes a sliding window overlap length and a weight factor used in the SWSC scheme.
The method according to claim 1,
Wherein the second receiving apparatus is paired with the first receiving apparatus based on the NOMA scheme in a service area in which a transmitting apparatus different from the transmitting apparatus provides a service.
The method according to claim 1,
Wherein the NOMA scheme is a power domain NOMA scheme.
A method of operating a receiving device in a wireless communication system,
A non-orthogonal multiple access (NOMA) method is applied to a first receiving apparatus that is paired with the receiving apparatus when a sliding window superposition coding scheme is applied to the receiving apparatus from the transmitting apparatus. And receiving second information that is information related to the NOMA scheme when the NOMA scheme is applied to the first receiving apparatus, in a wireless communication system Method of operation of the device.
9. The method of claim 8,
Receiving a signal;
Detecting and decoding a first target signal that is a target of a second receiving apparatus that is paired with the receiving apparatus based on a NOMA scheme in a service area in which the transmitting apparatus provides a service among the received signals;
Removing the first target signal from the received signal;
Detecting and decoding a first downlink interference (DI) signal that is a signal targeting the first receiving device in the received signal;
And removing the first target signal and the first DI signal from the received signal.
10. The method of claim 9,
The first target signal is one of a plurality of superimposed signals generated based on parameters used in the SWSC scheme applied to the receiver,
Wherein the first DI signal is one of a plurality of superimposed signals generated based on a parameter used in the SWSC scheme applied to the first receiver.
11. The method of claim 10,
The process of detecting and decoding the first target signal comprises:
Calculating a log likelihood ratio (LLR) for the first target signal;
And performing a turbo decoding operation on the first target signal.
9. The method of claim 8,
Wherein the NOMA scheme is a power domain NOMA scheme.
9. The method of claim 8,
Wherein the first receiving apparatus is paired with the first receiving apparatus based on the NOMA scheme in a service area in which a transmitting apparatus different from the transmitting apparatus provides a service.
A method of operating a receiving device in a wireless communication system,
Whether a sliding window superposition coding scheme is applied to a first receiving apparatus that is paired based on a non-orthogonal multiple access (NOMA) scheme with the receiving apparatus from the transmitting apparatus And receiving second information, which is information related to the SWSC scheme, in the wireless communication system.
15. The method of claim 14,
Wherein the NOMA scheme is a power domain NOMA scheme.
15. The method of claim 14,
Wherein the second information includes a sliding window overlap length used in the SWSC scheme and a weight factor.
15. The method of claim 14,
Receiving a signal;
Performing an interference cancellation (IC) operation on a signal targeted for the first receiving apparatus among the received signals;
Calculating a log likelihood ratio (LLR) of a signal from which the interference signal has been removed from the received signal;
And performing a turbo decoding operation on a signal from which the interference signal has been removed from the received signal.
18. The method of claim 17,
The step of performing an IC operation on a signal targeted for the first receiving apparatus among the received signals includes:
Detecting and decoding a first target signal that targets the receiving apparatus;
Removing the first target signal from the received signal;
Detecting and decoding a second target signal that targets the receiving apparatus;
And removing the first target signal and the second target signal from the received signal.
19. The method of claim 18,
Wherein each of the first target signal and the second target signal is one of a plurality of superimposed signals generated based on parameters used in the SWSC scheme applied to the receiving apparatus, .
20. The method of claim 19,
Wherein the NOMA scheme is a power domain NOMA scheme.

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