KR20160075996A - Apparatus and method for transmitting to cancel interference between beams - Google Patents

Abstract

Provided are a transmitting method for canceling an interference between beams in a millimeter wave band-based communication system and an apparatus thereof. When a signal is transmitted in a communication environment in which a service is provided through multiple beams within one cell, a sequence is generated based on a beam identifier assigned to each beam. The sequence includes a sequence for generating a reference signal and/or a sequence for scrambling data.

Description

[0001] The present invention relates to a transmission method and apparatus for canceling interference between beams,

The present invention relates to a method and apparatus for transmitting a signal for inter-beam interference cancellation in a millimeter-wave band-based communication system.

A study on communication system design with millimeter wave band (for example, 28 GHz, 30 GHz, 60 GHz, etc.) as a core technology for increasing the transmission capacity of the next generation mobile communication has recently attracted attention. In the millimeter wave communication system, unlike the conventional 2 to 3 GHz band cellular system, the propagation attenuation is large. In order to compensate for this, beamforming is used. In addition, beamforming not only increases signal intensity in a specific direction but also reduces signal transmission in an undesired direction.

In a millimeter-wave communication system that divides each area within a cell by a beam, each of the UEs in each of the beams accesses multiple OFDMA (Orthogonal Frequency Division Multiple Access). When one cell is divided into M beam regions, when the transmission capacity per cell is ideal, the transmission capacity per cell of the conventional OFDMA based cellular system is M times. However, it is necessary to overcome the inter-beam interference problem in order to obtain a transmission capacity corresponding to M times the conventional transmission capacity.

SUMMARY OF THE INVENTION It is an object of the present invention to provide a signal transmission method and apparatus for reducing inter-beam interference in a millimeter wave band based communication system.

According to an aspect of the present invention, there is provided a method of transmitting a signal in a communication environment in which a service is provided through a plurality of beams in a cell, the method comprising: generating a sequence based on a beam identifier assigned for each beam; Generating a reference signal based on the sequence; And transmitting the reference signal.

The step of generating the sequence may include generating a root sequence for generating an uplink reference signal based on the beam identifier.

The step of generating the root sequence may generate a root sequence based on a slot number including a reference signal, a cell identifier for a cell to which the beam belongs, a delta offset transmitted from an upper layer, and the beam identifier. Here, the root sequence may be for generating an uplink reference signal of a terminal not located in a beam boundary region.

The step of generating the root sequence may further include generating a root sequence for generating an uplink reference signal of a terminal located in a beam boundary region.

The step of generating a root sequence for generating an uplink reference signal of a terminal located in the beam boundary region may include generating a root sequence including a slot number including a reference signal, a cell identifier for a cell to which the beam belongs, a delta offset transmitted from an upper layer, A root sequence can be generated based on a virtual beam identifier commonly assigned to terminals located in the beam boundary region.

The step of generating the sequence may include generating a pseudo-random sequence for generating a downlink reference signal based on the beam identifier.

Wherein the generating the pseudo-random sequence may generate the pseudo-random sequence based on the slot number, the scrambling identifier, and the beam identifier including the reference signal, and the pseudo- And may be for generating a downlink reference signal.

The generating of the reference signal may generate the reference signal for the downlink signal using the pseudo-random sequence and the orthogonal code.

The generating of the pseudo-random sequence may further include generating a pseudo-random sequence for generating a downlink reference signal of a terminal located in a beam boundary region.

The step of generating a pseudo-random sequence for generating a downlink reference signal of a terminal located in the beam boundary region includes: generating a slot number including a reference signal, a scrambling identifier, The pseudo-random sequence may be generated based on the virtual beam identifier.

The scrambling identifier may be an identifier of a scrambling sequence for scrambling the reference signal, and the scrambling sequence may be generated using a beam identifier.

According to another aspect of the present invention, there is provided a method of transmitting a signal in a communication environment in which a service is provided through a plurality of beams in a cell, the method comprising: generating a scrambling sequence based on a beam identifier assigned on a beam- ; Scrambling data to be transmitted based on the scrambling sequence; And processing the scrambled data by transmitting the processed signal as a transmittable signal.

The step of generating the scrambling sequence may generate the scrambling sequence based on the beam identifier, the cell identifier, the slot number including the signal, and the terminal identifier.

According to another aspect of the present invention, there is provided a transmitter for transmitting a signal in a communication environment in which a service is provided through a plurality of beams in a cell, comprising: a radio frequency converter for transmitting / receiving a signal through a plurality of antennas; And a process of controlling transmission of the signal, wherein the processor generates a sequence based on a beam identifier assigned to each beam and generates a reference signal based on the sequence, .

The reference signal generator generates a root sequence for generating an uplink reference signal of a terminal not located in a beam boundary region based on the beam identifier, the root sequence including a slot number including a reference signal, A cell identifier for the cell, a delta offset transmitted from the upper layer, and the beam identifier.

The reference signal generator generates a root sequence for generating an uplink reference signal of a terminal located in a beam boundary region based on the beam identifier, and the root sequence includes a slot number including a reference signal, It is possible to generate a root sequence based on a cell identifier for a base station, a delta offset transmitted from an upper layer, and a virtual beam identifier commonly assigned to terminals located in the beam boundary region.

Wherein the reference signal generator generates a pseudo-random sequence for generating a downlink reference signal of a terminal not located in a beam boundary region based on the beam identifier, the pseudo-random sequence including a slot number including a reference signal, a scrambling identifier , And the pseudo-random sequence may be generated based on the beam identifier.

Wherein the reference signal generator generates a pseudo-random sequence for generating a downlink reference signal of a terminal located in a beam boundary region based on the beam identifier, the pseudo-random sequence including a slot number including a reference signal, a scrambling identifier, And may be generated based on a virtual beam identifier commonly assigned to terminals located in the beam boundary region.

The processor may further include a scrambling unit for generating a scrambling sequence based on the beam identifier and scrambling data to be transmitted based on the scrambling sequence.

The scrambling processing unit may generate the scrambling sequence based on the beam identifier, the cell identifier, the slot number including the signal, and the terminal identifier.

According to an embodiment of the present invention, in a communication environment in which a beam-based virtual cell is formed in a millimeter-wave band-based communication system, a reference signal or data for channel estimation may be generated by generating a sequence based on a beam identifier. Therefore, degradation of channel estimation performance and data decoding performance due to inter-beam interference can be reduced.

1 is a diagram illustrating a mobile communication environment according to an embodiment of the present invention.
FIG. 2 is an exemplary view showing inter-beam interference. FIG.
3 is a flowchart of a transmission method according to an embodiment of the present invention.
4 is a flowchart of a transmission method according to another embodiment of the present invention.
5 is a flowchart of a transmission method according to another embodiment of the present invention.
6 is a structural diagram of a transmitting apparatus 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, when an element is referred to as "comprising ", it means that it can include other elements as well, without excluding other elements unless specifically stated otherwise.

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 (HR- A subscriber station (SS), a portable subscriber station (PSS), an access terminal (AT), a user equipment (UE) , HR-MS, SS, PSS, AT, UE, and the like.

Also, a base station (BS) is an advanced base station (ABS), a high reliability base station (HR-BS), a node B, an evolved node B, eNodeB), an access point (AP), a radio access station (RAS), a base transceiver station (BTS), a mobile multihop relay (MMR) (RS), a relay node (RN) serving as a base station, an advanced relay station (ARS) serving as a base station, a high reliability relay station (HR) A femto BS, a home Node B, a HNB, a pico BS, a metro BS, a micro BS, ), Etc., and may be all or part of an ABS, a Node B, an eNodeB, an AP, a RAS, a BTS, an MMR-BS, an RS, an RN, an ARS, It may include a negative feature.

Hereinafter, a transmission method and apparatus for eliminating inter-beam interference according to an embodiment of the present invention will be described with reference to the drawings.

1 is a diagram illustrating a mobile communication environment according to an embodiment of the present invention.

In a millimeter wave band based mobile communication environment, a service is provided through a plurality of beams in one cell. For example, there may be 32 beam regions within a base station, and each beam region may support a maximum 3.2 Gbps data transmission capacity using a 1 GHz bandwidth.

As shown in FIG. 1, one cell is divided into M beam regions, and the beam-divided region can operate as a virtual cell. In a system in which a virtual cell is formed based on such a beam, the terminals in each beam region are multiplexed into OFDMA (Orthogonal Frequency Division Multiple Access).

In a beam-based virtual cell system, inter-beam interference affects data decoding.

Generally, in a communication system such as an OFDMA-based cellular system or LTE (long term evolution) or LTEA, scrambling is performed on a data bit stream to reduce data interference between adjacent cells.

In this case, the inter-cell interference indicates a signal of a neighboring cell BS received from a desired base station through a desired frequency resource. Also, in the case of the uplink, inter-cell interference represents a signal received from terminals in a cell boundary region through a desired terminal and a set frequency resource.

The signals received by the base station on the uplink basis are as follows.

로 나타낼 경우,

는 원하는 신호에 대한 비트 스트림이 변조 매핑된 성상도(constellation) 심볼을 나타내고,

는 간섭 신호에 대한 비트 스트림이 변조 매핑된 성상도 심볼을 나타낸다. 그리고 H_D는 원하는 신호에 대한 주파수 영역 채널을 나타내고, H_I는 간섭 신호에 대한 주파수 영역 채널을 나타낸다. n_D는 수신 잡음을 나타낸다. Here, a bit stream for a desired signal is referred to as b _D , a bit stream for an interference signal is referred to as b _I , and a modulation mapping function

Lt; / RTI >

Denotes a constellation symbol in which a bit stream for a desired signal is a modulation-mapped symbol,

Represents a constellation symbol in which a bit stream of an interference signal is modulated and mapped. And H _D represents the frequency domain channel for the desired signal and H _I represents the frequency domain channel for the interference signal. n _D represents the reception noise.

Based on the received signal, the received bitstream can be estimated through equlization and modulation demapping.

는 추정된 원하는 신호를 나타내고,

는 추정된 원하는 신호의 수신 비트 스트림을 나타낸다. 또한,

,

가 만족된다. here,

≪ / RTI > represents the estimated desired signal,

Represents a received bitstream of the estimated desired signal. Also,

,

Is satisfied.

성분이 간섭으로 작용하여, 원하는 신호의 복호 성능을 저하시킨다. 이에 따라 인코더(encoder)의 출력 비트 스트림 C_D를 다음과 같이 스크램블링한다. In the above equation (3)

Components act as interference, degrading the decoding performance of a desired signal. Accordingly, the output bit stream C _D of the encoder is scrambled as follows.

는 element wise product 연산을 나타내고,

는 스크램블링 시퀀스에 따른 비트 스트림을 나타낸다. Here,

Represents an element wise product operation,

Represents a bit stream according to a scrambling sequence.

가 이상적일 경우, 다음과 같은 특성을 가진다. Scrambling sequence

Is ideal, it has the following characteristics.

의 특성을 이용하여 셀간 간섭 신호의 영향을 줄일 수 있다. The scrambling sequence < RTI ID = 0.0 >

The influence of the inter-cell interference signal can be reduced.

는 셀간 간섭을 고려하여, 셀 식별자(cell identifier), 그리고 단말 식별자(예를 들어, c-RNTI(cell-radio network temporary identifier))를 토대로 생성될 수 있다. This scrambling sequence

May be generated based on a cell identifier and a cell identifier (for example, a cell-radio network temporary identifier (c-RNTI)) in consideration of inter-cell interference.

In a beam-based virtual cell system according to an embodiment of the present invention, data scrambling is performed using a scrambling sequence and a scrambling sequence is generated using a beam identifier in order to reduce inter-beam interference affecting data decoding.

The generation of the scrambling sequence according to the embodiment of the present invention can be expressed as follows.

In the embodiment of the present invention, a scrambling sequence is generated based on a beam identifier, a cell identifier, a slot number including a signal, and a user ID. And scrambles the data using a scrambling sequence generated based on the beam identifier.

Meanwhile, inter-beam interference in a beam-based virtual cell system also affects channel estimation performance required for data decoding.

FIG. 2 is an exemplary view showing inter-beam interference. FIG.

2, signals (data, reference signals, etc.) from the UE UE A in the uplink are received not only by the corresponding reception beam but also by the adjacent beams, resulting in inter-beam interference. The interference to the terminal in the adjacent beam region is generated not only in the uplink but also in the downlink.

In the embodiment of the present invention, the interference problem in the uplink and downlink channel estimation is solved by using the virtual beam ID.

A sequence having a constant amplitude zero auto-correlation (CAZAC) characteristic (e.g., a Zadoff-Ch sequence) for channel estimation for uplink data demodulation in an LTE (Long Term Evolution) It is used as a reference signal.

The Zadoff-Chu sequence can secure orthogonality between the reference signals in the time domain through cyclic shift for the same root sequence through Equation (7) as follows.

은 루트 시퀀스(root sequence)의 n번째 부반송파에 해당하는 값을 의미하고,

는 α만큼의 위상 시프트(phase shift)를 나타낸다. here

Denotes a value corresponding to the n-th subcarrier of the root sequence,

Represents a phase shift by?.

In the LTE / LTE-A, the identifiers u and v of the root sequence are determined by the slot number including the reference signal, the cell identifier, and the delta offset transmitted from the upper layer. Since the number of orthogonal reference signal resources that can be generated in one root sequence is limited, a reference signal is generated by varying the root sequence operation for each cell to accommodate a plurality of terminals. However, there is no orthogonality between the reference signals generated using different root sequences, unlike the case of securing the reference signal through the cyclic shift based on the same root sequence.

In a beam-based virtual cell system, when a reference signal is generated based on a cell identifier, the number of reference signals to be allocated to the UE increases in proportion to the number of beams. Accordingly, in the embodiment of the present invention, when a root sequence is generated, operation of a beam-to-beam reference signal is varied including a beam identifier. This can be expressed by the following equation.

는 루트 시퀀스 생성 함수를 나타낸다. 루트 시퀀스 생성시, 루트 시퀀스의 식별자 u와 ν는 기준 신호가 포함된 슬롯 번호, 셀 식별자, 상위 레이어에서 전달되는 델타 오프셋, 그리고 빔 식별자에 의해 결정된다. here

Represents a root sequence generation function. When generating the root sequence, the identifiers u and v of the root sequence are determined by the slot number including the reference signal, the cell identifier, the delta offset transmitted from the upper layer, and the beam identifier.

By varying the root sequence of the beam-to-beam Zadoff-Chu sequence, it is possible to generate a reference signal capable of accommodating the UEs in proportion to the number of beams.

However, by differentiating the interbeam root sequence, orthogonality between the reference signals transmitted from the terminals in the beam boundary region can not be ensured. As a result, when the channel estimation is performed, the reference signal of the beam edge region terminal acts as an interference, which may degrade the channel estimation performance.

In the embodiment of the present invention, for a beam edge area terminal, each terminal shares a virtual beam ID (virtual beam ID) instead of the identifier of the corresponding beam to generate the same root sequence, and a criterion that secures orthogonality through cyclic shift And assigns a signal to each terminal. Accordingly, it is possible to eliminate the interference of the reference signal generated in the beam boundary region.

This can be expressed by the following equation.

At the time of generating a root sequence for a terminal located in a beam boundary region, identifiers u and v of the root sequence are a slot number including a reference signal, a cell identifier, a delta offset transmitted from an upper layer, and Is determined by the virtual beam identifier.

The virtual beam identifier can be represented as follows.

Here, the temporary beam ID represents a temporary beam identifier shared by the beam boundary area terminals through upper layer signaling.

Unlike the reference signal for channel estimation for uplink data demodulation, a reference signal for channel estimation for downlink data demodulation can be generated as follows.

Unlike the uplink, a reference signal is generated as follows using a pseudo random sequence and a Walsh code for channel estimation for downlink data demodulation in an LTE / LTE-A system.

은 월쉬 코드를 나타내며,

은 의사 랜덤 시퀀스를 나타낸다.

은 다음과 같이 나타낼 수 있다. Here, p denotes an antenna port number, k denotes a frequency index, and 1 denotes a time index.

Represents a Walsh code,

Represents a pseudorandom sequence.

Can be expressed as follows.

는 의사 랜덤 시퀀스 생성 함수를 나타낸다. 이 함수를 토대로, 슬롯 번호, 셀 식별자, 그리고 상위 레이어에서 전달 되는 스크램블링 식별자를 초기값으로 하여, 의사 랜덤 시퀀스를 생성한다. here,

Represents a pseudo-random sequence generation function. Based on this function, a pseudo-random sequence is generated with the slot number, the cell identifier, and the scrambling identifier transmitted from the upper layer as initial values.

의 직교성을 이용해 서로 직교하는 기준 신호들을 생성할 수 있다. For the terminals using the same time and frequency resources using the pseudo-random sequence thus generated,

The orthogonality of the reference signals can be used to generate orthogonal reference signals.

However, in order to secure orthogonality using the Walsh code, the same pseudo-random sequence should be used between terminals using the same time and frequency resources.

Therefore, when only a cell identifier is used in generating a pseudo-random sequence, the number of orthogonal reference signals that can be secured per cell is limited by the Walsh code length.

In the embodiment of the present invention, a pseudo-random sequence is generated using a beam identifier. That is, a pseudo-random sequence is generated as follows.

를 토대로, 빔 식별자, 슬롯 번호, 그리고 상위 레이어에서 전달 되는 스크램블링 식별자를 초기값으로 하여, 의사 랜덤 시퀀스를 생성한다. 이에 따라, 각 빔 당 직교성을 가지는 기준 신호들을 생성할 수 있으며, 각 빔당 월쉬 코드의 길이를 토대로 하는 개수만큼의 직교 기준 신호들을 생성할 수 있다. 이와 같이 생성되는 각 빔 당 동일한 의사 랜덤 시퀀스를 사용하는 직교 기준 신호들을 동일한 시간 및 주파수 자원을 사용하는 단말들 사이에 사용할 수 있다. as above,

A pseudo-random sequence is generated based on a beam identifier, a slot number, and a scrambling identifier transmitted from an upper layer as initial values. Accordingly, it is possible to generate reference signals having orthogonality per beam, and to generate orthogonal reference signals as many as the number based on the Walsh code length per beam. Orthogonal reference signals using the same pseudo-random sequence for each beam thus generated can be used between terminals using the same time and frequency resources.

On the other hand, in the case of the beam boundary area terminal, the channel estimation performance may be degraded due to inter-beam reference signal interference as in the uplink.

Therefore, in the embodiment of the present invention, when generating a reference signal for channel estimation for downlink data demodulation, each terminal may share a virtual beam ID instead of an identifier of a corresponding beam in a beam boundary area terminal, A pseudo-random sequence is generated, and a reference signal securing orthogonality is cyclically shifted to each terminal.

This can be expressed by the following equation.

를 토대로, 가상 빔 식별자, 슬롯 번호, 그리고 상위 레이어에서 전달 되는 스크램블링 식별자를 초기값으로 하여, 의사 랜덤 시퀀스를 생성한다.When a pseudo-random sequence is generated for a terminal located in a beam boundary region, as shown in Equation (8)

A pseudo-random sequence is generated based on the virtual beam identifier, the slot number, and the scrambling identifier transmitted from the upper layer as initial values.

The virtual beam identifier can be represented as follows.

Next, a transmission method according to an embodiment of the present invention will be described.

3 is a flowchart of a transmission method according to an embodiment of the present invention.

In a beam-based virtual cell system, when a signal is transmitted, scrambling is performed on the data bit stream in order to reduce data interference between adjacent cells.

3, the transmitting apparatus receives the data bitstream to be transmitted (S100), and encodes the data bitstream (S110).

And scrambles the encoded data bitstream. To this end, the transmitting apparatus generates a scrambling sequence (S120). In particular, a scrambling sequence is generated using a beam identifier. As described above, the scrambling sequence generates a scrambling sequence using a beam identifier, a cell identifier, a slot number including a signal, and a terminal identifier based on Equation (6).

The transmitting apparatus scrambles the encoded data bitstream using the scrambling sequence (S130).

The scrambled data stream is modulated and then transmitted as a transmittable signal (S140).

Meanwhile, the transmitting apparatus generates and transmits a reference signal for data decoding and channel information acquisition, and the reference signal can be transmitted as follows.

4 is a flowchart of a transmission method according to another embodiment of the present invention.

In a beam-based virtual cell system, a reference signal is generated based on a beam identifier and transmitted. The reference signal may be transmitted frame by frame for data decoding and channel estimation.

The transmitting apparatus generates a reference signal for uplink, and for this purpose, generates a root sequence for the reference signal. In a beam-based virtual cell system, a root sequence is generated based on a beam identifier to differentiate reference signal operations between beams. And generates a reference signal for a beam boundary area terminal using a virtual beam identifier as a beam identifier.

To this end, the transmitting apparatus acquires a delta offset transmitted from an upper layer (S300), and determines whether the terminal is located in a beam boundary region (S310).

In the case where the terminal is not located in the beam boundary region, the transmitting apparatus generates a root sequence based on the beam identifier (S320). Specifically, as shown in Equation (8) above, a root sequence is generated based on a slot number including a reference signal, a cell identifier, a delta offset transmitted from an upper layer, and a beam identifier. Then, the uplink reference signal is generated and transmitted based on the generated root sequence (S330, S340).

On the other hand, if the terminal is a terminal located in a beam boundary region, the transmitting apparatus generates a root sequence based on the virtual beam identifier (S350). The virtual beam identifier is an identifier temporarily assigned and is a temporary beam identifier that is shared between beam boundary area terminals through upper layer signaling. The transmitting apparatus generates a root sequence based on the slot number including the reference signal, the cell identifier, the delta offset transmitted from the upper layer, and the virtual beam identifier, as shown in Equation (9). Then, the uplink reference signal is generated and transmitted based on the generated root sequence (S330, S340).

5 is a flowchart of a transmission method according to another embodiment of the present invention.

A transmitter generates a pseudo-random sequence for a reference signal to generate a downlink reference signal. In a beam-based virtual cell system, a pseudo-random sequence is generated based on a beam identifier in order to differentiate a reference signal operation between beams based on the same root sequence. And generates a reference signal for a beam boundary area terminal using a virtual beam identifier as a beam identifier.

To this end, the transmitting apparatus acquires a scrambling identifier transmitted from an upper layer (S500), and determines whether the terminal is located in the beam boundary region (S510).

If the terminal is a terminal that is not located in the beam boundary region, the transmitting apparatus generates a pseudo-random sequence based on the beam identifier (S520). Specifically, as shown in Equation (13), the pseudo-random sequence is generated with the beam identifier, the slot number, and the obtained scrambling identifier as initial values. Here, the scrambling identifier may be an identifier corresponding to the scrambling sequence generated according to the above FIG.

Then, a reference signal for a downlink signal is generated and transmitted using the generated pseudo-random sequence and a Walsh code (S530, S540). The generated reference signal is orthogonal to the reference signals of the terminals using the pseudo-random sequence.

On the other hand, when the terminal is located in the beam boundary region, the transmitting apparatus generates a pseudo-random sequence based on the virtual beam identifier (S550). The virtual beam identifier is an identifier temporarily assigned and is a temporary beam identifier that is shared between beam boundary area terminals through upper layer signaling. The transmitting apparatus generates a pseudo-random sequence with the virtual beam identifier, the slot number, and the obtained scrambling identifier as initial values, as shown in Equation (14). Here, the scrambling identifier may be an identifier corresponding to the scrambling sequence generated according to the above FIG.

Then, a reference signal for a downlink signal is generated and transmitted using the generated pseudo-random sequence and an orthogonal code (e.g., Walsh code) (S530, S540).

6 is a diagram illustrating a structure of a transmitting apparatus according to an embodiment of the present invention.

As shown in FIG. 6, the transmitting apparatus 100 includes a processor 110, a memory 120, and a radio frequency (RF) converter 130. The processor 110 may be configured to implement the procedures and methods described above based on Figs. 1-5.

For this, the processor 110 may include a reference signal generator 111 and a scrambling processor 112.

When generating a UL reference signal, the reference signal generating unit 111 generates a root sequence based on a beam identifier when the terminal is not located in a beam boundary region, and generates a root sequence using an uplink reference Signal. In the case of a terminal located in a beam boundary region, a root sequence is generated based on a virtual beam identifier, and a reference signal for an uplink is generated using a root sequence.

On the other hand, when generating the downlink reference signal, the reference signal generating unit 111 generates a pseudo-random sequence for generating a reference signal based on the beam identifier, for terminals not located in the beam boundary region, And generates a downlink reference signal using a random random sequence and an orthogonal code (e.g., Walsh code). Also, for a terminal located in a beam boundary region, a pseudo-random sequence for generating a reference signal is generated based on a virtual beam identifier, and a downlink reference signal is generated using the generated random random sequence and an orthogonal code.

The scrambling processing unit 112 generates a scrambling sequence using the beam identifier. And scrambles the data bitstream (or reference signal) using the scrambling sequence.

The memory 120 is coupled to the processor 11 and stores various information related to the operation of the processor 110. [ The RF converter 130 is connected to the processor 110 and transmits or receives a radio signal, and in particular, can transmit and receive signals using multiple antennas.

The embodiments of the present invention described above are not necessarily implemented by apparatuses and methods but may be implemented by a program capable of executing functions corresponding to the configuration of the method according to the embodiment of the present invention or a computer And the present invention can be easily implemented by those skilled in the art from the description of the embodiments 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 transmitting a signal in a communication environment in which a service is provided through a plurality of beams in one cell,
Generating a sequence based on a beam identifier assigned to each beam;
Generating a reference signal based on the sequence; And
Transmitting the reference signal
/ RTI > The method according to claim 1,
The step of generating the sequence
And generating a root sequence for generating an uplink reference signal based on the beam identifier. 3. The method of claim 2,
The step of generating the root sequence
A root sequence is generated based on a slot number including a reference signal, a cell identifier for a cell to which the beam belongs, a delta offset transmitted from an upper layer, and the beam identifier, For uplink reference signal generation. The method of claim 3,
The step of generating the root sequence
Generating a root sequence for generating an uplink reference signal of a terminal located in a beam boundary region
Further comprising: 5. The method of claim 4,
Wherein the step of generating a root sequence for generating an uplink reference signal of a terminal located in the beam boundary region comprises:
A root sequence is generated based on a slot number including a reference signal, a cell identifier for a cell to which the beam belongs, a delta offset transmitted from an upper layer, and a virtual beam identifier commonly assigned to terminals located in the beam boundary region Gt; The method according to claim 1,
The step of generating the sequence
And generating a pseudo-random sequence for generating a downlink reference signal based on the beam identifier. The method according to claim 6,
Wherein the generating the pseudo-random sequence comprises:
Wherein the pseudo-random sequence is for generating a downlink reference signal of a terminal that is not located in a beam boundary region, the pseudo-random sequence being generated based on a slot number, a scrambling identifier, and the beam identifier including a reference signal, Way. The method according to claim 6,
Wherein the step of generating the reference signal comprises:
And generates a reference signal for a downlink signal using the pseudo-random sequence and the orthogonal code. The method according to claim 6,
Wherein the generating the pseudo-random sequence comprises:
Generating a pseudo-random sequence for generating a downlink reference signal of a terminal located in a beam boundary region
Further comprising: 10. The method of claim 9,
Wherein the step of generating a pseudo-random sequence for generating a downlink reference signal of a terminal located in the beam boundary region comprises:
Wherein the pseudo-random sequence is generated based on a slot number including a reference signal, a scrambling identifier, and a virtual beam identifier commonly assigned to terminals located in the beam boundary region. 11. The method according to any one of claims 7 to 10,
Wherein the scrambling identifier is an identifier of a scrambling sequence for scrambling the reference signal and the scrambling sequence is generated using a beam identifier. A method for transmitting a signal in a communication environment in which a service is provided through a plurality of beams in one cell,
Generating a scrambling sequence based on a beam identifier assigned to each beam;
Scrambling data to be transmitted based on the scrambling sequence; And
Processing the scrambled data as a transmittable signal and transmitting
/ RTI > The method of claim 12, wherein
Wherein generating the scrambling sequence comprises:
Wherein the scrambling sequence is generated based on the beam identifier, the cell identifier, the slot number including the signal, and the terminal identifier. In an apparatus for transmitting a signal in a communication environment in which a service is provided through a plurality of beams in one cell,
A radio frequency converter for transmitting and receiving signals through a plurality of antennas, and
And a process for controlling transmission of the signal, the process being connected to the radio frequency converter,
The processor comprising:
A reference signal generation unit for generating a sequence based on a beam identifier assigned for each beam and generating a reference signal based on the sequence,
. 15. The method of claim 14,
The reference signal generator generates a root sequence for generating an uplink reference signal of a terminal not located in a beam boundary region based on the beam identifier, the root sequence including a slot number including a reference signal, A cell identifier for the cell, a delta offset transmitted from the upper layer, and the beam identifier. 15. The method of claim 14,
The reference signal generator generates a root sequence for generating an uplink reference signal of a terminal located in a beam boundary region based on the beam identifier, and the root sequence includes a slot number including a reference signal, A delta offset transmitted from an upper layer, and a virtual beam identifier commonly assigned to terminals located in the beam boundary region. 15. The method of claim 14,
Wherein the reference signal generator generates a pseudo-random sequence for generating a downlink reference signal of a terminal not located in a beam boundary region based on the beam identifier, the pseudo-random sequence including a slot number including a reference signal, a scrambling identifier And generates the pseudo-random sequence based on the beam identifier. 15. The method of claim 14,
Wherein the reference signal generator generates a pseudo-random sequence for generating a downlink reference signal of a terminal located in a beam boundary region based on the beam identifier, the pseudo-random sequence including a slot number including a reference signal, a scrambling identifier, And a virtual beam identifier commonly assigned to terminals located in the beam boundary region. 15. The method of claim 14,
The processor
And a scrambling processing unit for generating a scrambling sequence based on the beam identifier and scrambling data to be transmitted on the basis of the scrambling sequence. The method of claim 19, wherein
Wherein the scrambling processing unit generates the scrambling sequence based on the beam identifier, the cell identifier, the slot number including the signal, and the terminal identifier.

Images