KR20120023200A - Method and apparatus for generating reference signal using sequence and sequence group hopping information in multiple input multiple output - Google Patents

Abstract

PURPOSE: A method and an apparatus for generating reference signal using sequence and sequence group hopping information in multiple input multiple output are provided to enable the production of reference signals in MIMO by assigning cyclic shift parameter. CONSTITUTION: A zadoff-chu base sequence is produced(S810). The cyclic shift indicated value of 3bit which is scheduled from the upper end is transmitted from a base station(S830). The user terminal confirms sequence and a sequence group hopping method(S850). Cyclic shift parameters are calculated according to each layer based on calculated on value(S860). DM-RS sequence is produced by the equation 1(S870). The produced DM-RS sequence is mapped with the corresponding symbol of each slot(S880). The SC-FDMA symbol is produced from resource element mapped with DM-RS sequence through a SC FDMA generator. The DM-RS signal is transmitted to the base station(S890).

Description

Method and apparatus for generating reference signal using sequence and sequence group hopping information in MIO environment {Method and Apparatus for Generating Reference Signal using Sequence and Sequence Group Hopping Information in Multiple Input Multiple Output}

The present disclosure relates to a wireless communication system. In particular, a method and apparatus for allocating a cyclic shift parameter using sequence and sequence group hopping information in a MIMO environment, generating and transmitting a reference signal, and a reference signal accordingly A method and apparatus for receiving.

As communication systems have evolved, consumers such as businesses and individuals have used a wide variety of wireless terminals.

Mobile communication systems such as LTE (Long Term Evolution) and LTE-A (LTE Advanced) of the current 3GPP series are high-speed and large-capacity communication systems that can transmit and receive various data such as video and wireless data, beyond voice-oriented services. In addition, there is a need to develop a technology capable of transmitting a large amount of data comparable to a wired communication network, and an appropriate error detection method for improving system performance by minimizing the reduction of information loss and increasing the system transmission efficiency is essential. It became.

Also, in various current communication systems, various reference signals are used to provide information on a communication environment to the counterpart device through uplink or downlink.

For example, in an LTE system, which is one of mobile communication methods, a user equipment (hereinafter referred to as “terminal” or “UE”) is used to identify channel information for demodulation of a data channel during uplink (UL) transmission. ) Transmits an uplink demodulation reference signal (UL DM-RS) in every slot as a reference signal. Also, a sounding reference signal is transmitted to a base station apparatus as a channel estimation reference signal indicating a channel state of a terminal, and a CRS as a reference signal is used to identify channel information during downlink transmission. This includes transmitting a cell-specific reference signal in every subframe.

On the other hand, these reference signals (Reference Signals) are commonly generated by the transmission apparatus of the reference signal, that is, the UE in the case of the uplink reference signal, the base station apparatus in the case of the downlink reference signal periodically and transmitted to the reference signal receiving apparatus .

In addition, the reference signals for uplink to date are generated by a method of generating a plurality of sequences by complexly changing phases using a constant cyclic shift.

Recently, however, there is a demand for extending a reference signal or sequence for reasons of flexibility of a communication system.

An embodiment of the present invention is to provide a technique for allocating a cyclic shift parameter that provides orthogonality for reference signal generation in a MIMO environment.

Another embodiment of the present invention is to provide a technique for allocating a cyclic shift parameter so as to generate a reference signal without separately transmitting information related to orthogonality.

In one embodiment of the present invention, the step of calculating the first cyclic shift parameter for the first layer from the control information received from the base station by the user terminal using two or more layers, the rank of the first user terminal is 3 When the sequence and the sequence group hopping method of the first user terminal are the first hopping method, the cyclic shift allocation rule is selected to maximize the distinction of each layer of the first user terminal, and the rank of the first user terminal is 3, and Selecting a cyclic shift allocation rule for maximizing a distinction between the first user terminal and another user terminal when the sequence and sequence group hopping method of the first user terminal are the second hopping method, and selecting the selected cyclic shift Calculate the cyclic shift parameters to be applied to layers other than the first layer using the assignment rule. Generating a reference signal using each cyclic shift parameter for each layer, and transmitting the generated reference signal to the base station. A reference signal generation method using hopping information is provided.

In another embodiment of the present invention, the step of calculating a first cyclic shift parameter for the first layer from the control information received from the base station by the user terminal using two or more layers, and the sequence and sequence group hopping of the user terminal Identifying a method, selecting a cyclic shift assignment rule linked to the identified sequence and sequence group hopping method, and applying to each layer using the selected assignment rule and the first cyclic shift parameter; Calculating a click shift parameter, generating a reference signal using each cyclic shift parameter calculated for each layer, and transmitting the generated reference signal to the base station; Reference Signal Generation Using Sequence and Sequence Group Hopping Information in MIMO Environment Provide a method.

In another embodiment of the present invention, a user terminal using two or more layers, the receiver for receiving control information from the base station, and the control information received by the receiver in the first cyclic shift parameter for the first layer A cyclic shift parameter calculator for calculating, a sequence and sequence group hopping information calculator for calculating information about the sequence and sequence group hopping method, and the first user terminal when the rank of the first user terminal is 2 or 4 Selecting a cyclic shift allocation rule for maximizing layer-specific discrimination of the first user terminal, and if the rank of the first user terminal is 3 and the sequence and sequence group hopping method of the first user terminal is a first hopping method, the first user Selecting a cyclic shift allocation rule for maximizing distinction of each layer of the terminal; If the rank of is 3 and the sequence and sequence group hopping method of the first user terminal are the second hopping method, the cyclic shift for selecting a cyclic shift allocation rule that maximizes the distinction between the first user terminal and another user terminal A layer-specific cyclic shift parameter calculator for calculating a cyclic shift parameter to be applied to layers other than the first layer by using an allocation rule selector, the selected cyclic shift assignment rule, and for each of the layers A reference signal generator using a sequence and sequence group hopping information in a MIMO environment, comprising a reference signal generator for generating a reference signal using the cyclic shift parameter of the transmitter, and a transmitter for transmitting the generated reference signal to the base station. To provide.

 According to another embodiment of the present invention, a receiver included in a user terminal using two or more layers, receiving control information from a base station, and calculating a first cyclic shift parameter for a first layer from the received control information. A click shift parameter calculator, a sequence and sequence group hopping information calculator that calculates information about the sequence and sequence group hopping method, and a sequence and sequence group hopping method identified by the sequence and sequence group hopping information calculator. A cyclic shift assignment rule selection unit for selecting a cyclic shift assignment rule, and a cyclic shift for each layer that calculates a cyclic shift parameter to be applied to each layer by using the selected assignment rule and the first cyclic shift parameter. The parameter calculator and the respective layers Reference using sequence and sequence group hopping information in a MIMO environment, comprising a reference signal generator for generating a reference signal using the calculated cyclic shift parameters, and a transmitter for transmitting the generated reference signal to the base station. Provided is a signal generation device.

 In another embodiment of the present invention, generating a control signal capable of indicating a first cyclic shift value for a first layer with respect to a user terminal using two or more layers, and converting the generated control signal to the corresponding terminal. And receiving a reference signal generated and transmitted by the user terminal according to a rank and / or a sequence applied to the user terminal and / or a sequence hopping scheme, and transmitting the reference signal. A method of receiving a reference signal using sequence group hopping information is provided.

According to another embodiment of the present invention, a control signal generator for generating a control signal capable of indicating a first cyclic shift value for a first layer with respect to a user terminal using two or more layers, and generating the control signal. A control signal transmitter for transmitting to the terminal, and a reference signal receiver for receiving the reference signal generated and transmitted by the user terminal according to the rank and / or sequence and sequence hopping scheme applied to the user terminal of the user terminal; A reference signal receiving apparatus using sequence and sequence group hopping information in a MIMO environment is provided.

1 illustrates a wireless communication system to which embodiments of the present invention are applied.
2 illustrates a subframe and time slot structure of transmission data that can be applied to an embodiment of the present invention.
3 is a diagram illustrating a process of generating a DM-RS sequence by a UE in an LTE environment.
4 is a diagram illustrating an example of allocating a CS value for each layer of a user terminal according to one embodiment of the present specification.
5 is a diagram illustrating an example of allocating a CS value for each layer of a user terminal according to one embodiment of the present specification.
6 is a diagram illustrating an example of allocating a CS value for each layer of a user terminal when the rank is 3 according to an embodiment of the present specification.
FIG. 7 is a diagram illustrating separation by a cyclic shift parameter when the rank is 3 according to an embodiment of the present specification.
8 is a diagram illustrating a process of generating a DM-RS sequence by a user terminal selecting a CS allocation rule linked with a sequence and a sequence group hopping scheme according to an embodiment of the present specification.
9 is a diagram illustrating an example of selecting a CS allocation rule for each layer according to a type of a sequence and a sequence group hopping scheme according to an embodiment of the present specification.
10 is a diagram illustrating a process of receiving a reference signal from a user terminal in a base station according to one embodiment of the present specification.
FIG. 11 is a diagram for selecting a cyclic shift allocation rule for a user terminal receiving a cyclic shift parameter for a first layer from a base station and calculating a cyclic shift parameter to be applied to another layer according to an embodiment of the present disclosure; Shows a process of generating a reference signal.
FIG. 12 is a diagram illustrating a cyclic shift assignment rule in which a user terminal according to another embodiment of the present disclosure receives a cyclic shift parameter for a first layer from a base station and calculates a cyclic shift parameter to be applied to another layer. Shows a process of generating a reference signal.
FIG. 13 is a diagram illustrating a configuration of an apparatus for receiving a reference signal generated / transmitted using a sequence and a sequence hopping scheme in a MIMO environment according to an embodiment of the present specification.
14 is a diagram illustrating a configuration of an apparatus for transmitting a reference signal using sequence and sequence group hopping information in a MIMO environment according to an embodiment of the present specification.

Hereinafter, some embodiments of the present invention will be described in detail through exemplary drawings. In adding reference numerals to the components of each drawing, it should be noted that the same reference numerals are assigned to the same components as much as possible even though they are shown in different drawings. In the following description of the present invention, a detailed description of known functions and configurations incorporated herein will be omitted when it may make the subject matter of the present invention rather unclear.

In addition, in describing the component of this invention, terms, such as 1st, 2nd, A, B, (a), (b), can be used. These terms are only for distinguishing the components from other components, and the nature, order or order of the components are not limited by the terms. If a component is described as being "connected", "coupled" or "connected" to another component, that component may be directly connected to or connected to that other component, but there may be another configuration between each component. It is to be understood that the elements may be "connected", "coupled" or "connected".

1 illustrates a wireless communication system to which embodiments of the present invention are applied.

Wireless communication systems are widely deployed to provide various communication services such as voice and packet data.

Referring to FIG. 1, a wireless communication system includes a user equipment (UE) 10 and a base station 20 (BS). The terminal 10 and the base station 20 apply an extended channel estimation reference signal generation technique as described in the following embodiments, which will be described in detail with reference to FIG.

Terminal 10 in the present specification is a generic concept that means a user terminal in wireless communication, WCDMA, UE (User Equipment) in LTE, HSPA, etc., as well as MS (Mobile Station), UT (User Terminal) in GSM ), SS (Subscriber Station), wireless device (wireless device), etc. should be interpreted as including the concept.

A base station 20 or a cell generally refers to a fixed station communicating with the terminal 10 and includes a Node-B, an evolved Node-B, and a Base Transceiver. May be called other terms such as System, Access Point, Relay Node

That is, in the present specification, the base station 20 or the cell should be interpreted in a comprehensive sense indicating some areas covered by the base station controller (BSC) in the CDMA, the NodeB of the WCDMA, and the like. It is meant to cover various coverage areas such as microcell, picocell, femtocell and relay node communication range.

In the present specification, the terminal 10 and the base station 20 are two transmitting and receiving entities used to implement the technology or the technical idea described in the present specification and are used in a comprehensive sense and are not limited by the terms or words specifically referred to.

There is no limitation on the multiple access scheme applied to the wireless communication system. Various multiple access techniques such as Code Division Multiple Access (CDMA), Time Division Multiple Access (TDMA), Frequency Division Multiple Access (FDMA), Orthogonal Frequency Division Multiple Access (OFDMA), OFDM-FDMA, OFDM-TDMA, OFDM-CDMA Can be used.

A TDD (Time Division Duplex) scheme in which uplink and downlink transmissions are transmitted using different time periods, or an FDD (Frequency Division Duplex) scheme in which they are transmitted using different frequencies can be used.

One embodiment of the present invention is resource allocation in the fields of asynchronous wireless communication evolving into Long Term Evolution (LTE) and LTE-advanced through GSM, WCDMA, HSPA, and synchronous wireless communication evolving into CDMA, CDMA-2000 and UMB. Can be applied to The present invention should not be construed as being limited or limited to a specific wireless communication field, but should be construed as including all technical fields to which the spirit of the present invention can be applied.

A wireless communication system to which an embodiment of the present invention is applied may support uplink and / or downlink HARQ, and may use a channel quality indicator (CQI) for link adaptation. In addition, multiple access schemes for downlink and uplink transmission may be different. For example, downlink uses Orthogonal Frequency Division Multiple Access (OFDMA), and uplink uses Single Carrier-Frequency Division Multiple Access (SC-FDMA). ) Is the same as can be used.

The layers of the radio interface protocol between the terminal and the network are based on the lower three layers of the Open System Interconnection (OSI) model, which are well known in the communication system. The physical layer may be divided into a second layer (L2) and a third layer (L3), and the physical layer belonging to the first layer provides an information transfer service using a physical channel.

 2 illustrates a subframe and time slot structure of transmission data that can be applied to an embodiment of the present invention.

Referring to FIG. 2, one radioframe or radio frame includes 10 subframes 210, and one subframe includes two slots 202 and 203. Can be. The basic unit of data transmission is a subframe unit, and downlink or uplink scheduling is performed on a subframe basis. One slot may include a plurality of OFDM symbols in the time domain and at least one subcarrier in the frequency domain, and one slot may include 7 or 6 OFDM symbols.

For example, if a subframe consists of two time slots, each time slot may include seven symbols in the time domain and twelve subcarriers or subcarriers in the frequency domain, such that time is defined as one slot. The frequency domain may be referred to as a resource block or a resource block (RB), but is not limited thereto.

In 3GPP LTE systems, the transmission time of a frame is divided into TTIs (transmission time intervals) of 1.0 ms duration. The terms "TTI" and "sub-frame" may be used in the same sense, and the frame is 10 ms long and includes 10 TTIs.

202 illustrates a general structure of a time-slot according to an embodiment of the present invention. As described above, the TTI is a basic transmission unit, where one TTI includes two time slots 202 and 203 of equal length, each time slot having a duration of 0.5 ms. Have The time-slot includes seven long blocks (LB) 211 for the symbol. LBs are separated into cyclic prefixes (CP) 212. Collectively, one TTI or subframe may include 14 LB symbols, but the present specification is not limited to such a frame, subframe or time-slot structure.

Meanwhile, in the LTE communication system, which is one of the current wireless communication methods, a demodulation reference signal (DMRS, DM-RS) and a sounding reference signal (SRS) are defined in the uplink, and the downlink Three reference signals (Reference Signal RS) are defined in the cell-specific reference signal (Cell-specific Reference Signal (CRS), MBSFN reference signal (Multicast / Broadcast over Single Frequency Network Reference Signal (MBSFN-RS) and This is a UE-specific reference signal.

)로 구성되며 LTE 시스템의 경우 하나의 레이어(layer)에 대하여 DM-RS 시퀀스를 구성할 수 있다. That is, in a wireless communication system, the terminal transmits an uplink demodulation signal (UL DMRS or UL DM-RS) every slot in order to determine channel information for demodulation of a data channel during uplink transmission. . In case of UL DM-RS associated with PUSCH (Physical Uplink Shared Channel), a reference signal is transmitted for one symbol in every slot, and in case of UL DMRS associated with physical uplink control channel (PUCCH), up to three in each slot The reference signal is transmitted for the symbol. In this case, the mapped DM-RS sequence includes a cyclic shift (CS) and a base sequence,

In the LTE system, a DM-RS sequence may be configured with respect to one layer.

3 is a diagram illustrating a process of generating a DM-RS sequence by a UE in an LTE environment.

[Equation 1]

및 베이스 시퀀스(

)에 의해 산출되는 예를 보여주고 있다. UL DM-RS 시퀀스를 위해 자도프추(zadoff-chu) 시퀀스 기반의 베이스 시퀀스를 생성한다(S310). 베이스 시퀀스는 그룹 넘버 u, 그룹 내의 베이스 시퀀스 넘버 v, 그리고 시퀀스의 길이인 n에 의하여 서로 다르게 생성된다. 그러나 동일한 기지국(셀 등) 및 슬롯 시간(slot time)에 동일한 주파수 대역(bandwidth)를 점유하는 UL DM-RS의 베이스 시퀀스는 동일하다. Equation 1 shows that the RS sequence is a cyclic shift CS

And base sequence (

Shows an example calculated by A base sequence based on a zadoff-chu sequence is generated for the UL DM-RS sequence (S310). The base sequence is generated differently by the group number u, the base sequence number v in the group, and n, the length of the sequence. However, the base sequences of the UL DM-RSs occupying the same bandwidth in the same base station (cell, etc.) and slot time are the same.

Meanwhile, a process of obtaining α, which is a value for the cyclic shift CS, is shown in Equation 2.

[Equation 2]

,

, 그리고,

를 산출해야 한다. To find the value of α, n _cs is

,

, And,

Should be calculated.

는 표 1과 같이 상위 레이어에 의해 주어지는 사이클릭 쉬프트 파라메터의 값에 의해 결정된다. 따라서, 표 1과 같이

를 산출한다(S320).remind

Is determined by the value of the cyclic shift parameter given by the upper layer as shown in Table 1. Therefore, as shown in Table 1

To calculate (S320).

TABLE 1

는 수학식 2에 나타난 바와 같이 산출되며(S320), 유사 랜덤 시퀀스인 c(i)는 셀에 대해 특정한(cell-specific) 값이 될 수 있다. remind

Is calculated as shown in Equation 2 (S320), and a pseudo-random sequence c (i) may be a cell-specific value.

는 표 2와 같이 가장 최근의 DCI 포맷 0에서의 DMRS 필드에서의 사이클릭 쉬프트에 의해 산출된다. S330과 같이 UE(단말)은 상위단으로부터 스케쥴링되어 결정된 3bit의 사이클릭 쉬프트 파라메터(cyclicShift parameter) 값을 기지국 등으로부터 전송받게 되며, 이 3bit의 값은 표 2의 실시예와 같이 DCI 포맷 0의 CS(Cyclic Shift) 필드에 실려서 전송될 수 있다. 이렇게 전송된 cyclic Shift 필드의 값은 표 2와 같이 매핑되어

가 산출된다(S330, S340).remind

Is calculated by the cyclic shift in the DMRS field in the most recent DCI format 0 as shown in Table 2. As shown in S330, the UE (terminal) receives a cyclic shift parameter value of 3 bits, which is determined by being scheduled from an upper end, from a base station or the like, and the value of 3 bits is a CS of DCI format 0 as shown in the embodiment of Table 2. Can be transmitted in the (Cyclic Shift) field. The cyclic shift field values thus mapped are mapped as shown in Table 2.

Are calculated (S330, S340).

TABLE 2

,

를 계산한다(S350).

의 값을 구하기 위한 n_cs에서 파라메터가 되는

과

는 각 기지국(셀 등) 및 슬롯 시간(slot time)에 따라 달라지지만, 동일한 기지국(셀 등) 및 슬롯 시간에서는 고정된 값을 가지므로, 실질적으로 n_cs의 값을 다르게 하는 파라메터는

이다. 즉, 실질적으로 상위단이 단말 별로 스케쥴링하여 기지국 등을 통해 전송하게 되는 파라메터는

이며, 이 값에 따라 UL DM-RS의 CS(Cyclic Shift) 값인 α가 서로 다른 값을 가지게 된다. Based on the values calculated in the following process S320 ~ S340

,

Calculate (S350).

Parameter to n _cs to find the value of

and

Is because of the fixed value in vary with each base station (cell, and so on) and time slot (time slot), the same base station (cell etc.) and the time slot, is substantially different from the value of the parameter that has n _cs

to be. That is, the parameter that is actually transmitted by the upper end is scheduled for each terminal through the base station, etc.

According to this value, α, which is a CS (Cyclic Shift) value of the UL DM-RS, has a different value.

(사이클릭 쉬프트 값, CS)에서 수학식 1에 의해 DM-RS 시퀀스를 생성한다(S360).And the base sequence of S310 and of S350

A DM-RS sequence is generated by Equation 1 from (cyclic shift value CS) (S360).

The DM-RS sequence generated by Equations 1 and 2 is mapped to a corresponding symbol of each slot, which is mapped through a resource element mapper (S370). The symbol is the fourth symbol of the seventh symbol of every slot when using a normal CP (cyclic prefix) in case of DM-RS associated with a PUSCH, and the third symbol of every slot when using an extended CP. Corresponds to In the case of the DM-RS associated with the PUCCH, the corresponding symbol may be a maximum of three symbols in each slot, and the number and location of the corresponding symbols vary according to the type of CP and the format of the PUCCH as shown in Table 3 below.

[Table 3] Symbol location in slot according to CP type and PUCCH format

When the mapping is completed, an SC-FDMA symbol is generated from a resource element (RE) to which the DM-RS sequence is mapped through an SC FDMA generator to transmit a DM-RS signal to a base station (S380).

On the other hand, next-generation communication technologies such as the Long Term Evolution-Advanced (LTE-A) system currently discussed will support up to four antennas in the uplink, thereby distinguishing each other for up to four layers. DM-RS sequence mapping is required. To this end, orthogonality may be maintained by varying CS values in the base sequence.

In addition, in order to further ensure orthogonality between layers in a single-user multiple input multiple output (SU-MIMO) and multiple-user multiple input multiple output (MU-MIMO), or to distinguish a plurality of terminals in MU-MIMO. A method of adding an orthogonal cover code (OCC) has been proposed.

OCC may be configured as shown in Table 4.

[Table 4] Composition of OCC

On the other hand, when using only one layer as in the conventional LTE has been signaling (signaling) to the UE (terminal) by the CS value determined by scheduling (scheduling) from the upper end through the base station (eNB), In a system such as LTE-A, it is necessary to allocate CS values so that many layers and terminals can have orthogonality with each other, that is, each layer and each UE can be distinguished with each other with orthogonality.

In the present specification, a method and apparatus for allocating a cyclic shift (CS) value in each layer of an uplink (UL) demodulation reference signal (DM-RS), If the base station (eNB, etc.) loads the cyclic shift value (CS) in the CS field of the PDCCH DCI format 0 in the first layer that is determined by scheduling at the upper end, and lowers it to the UE (UE) We will present a method and apparatus for implicitly assigning a Cyclic Shift (CS) value of another layer from the value (if signaling).

4 is a diagram illustrating an example of allocating a CS value for each layer of a user terminal according to one embodiment of the present specification. 4 shows an example of setting the cyclic shift parameters of other layers using the values of the cyclic shift parameters of the first layer (the first layer). Therefore, by assigning the CS value having the largest separation, the layer division is made more clear. Looking in more detail as follows.

, k = 0, 1, ..., N-1)을 할당하는 과정을 보여준다. 제 1 레이어에 대한 사이클릭 쉬프트 값(

) 은 표 2와 같이 기지국으로부터 3bit 값을 수신하여 설정할 수 있다. 그리고 다른 레이어(제 2, 3, ..., N 레이어)에 대해서는 제 1 레이어에 대한 사이클릭 쉬프트 값(

)에서 이격이 크도록 Δ_k의 오프셋을 가지도록 하며, 아래의 수학식 3을 이용하여 적용할 수 있다.4 shows cyclic shift values (N) for N layers (first, second, ..., N layers).

, k = 0, 1, ..., N-1). The cyclic shift value for the first layer (

) Can be set by receiving a 3-bit value from the base station as shown in Table 2. And for other layers (second, third, ..., N layers), the cyclic shift value for the first layer (

) To have an offset of Δ _k so that the separation is large, and may be applied using Equation 3 below.

&Quot; (3) "

)으로는 3bit의 사이클릭 쉬프트 지시(Cyclic Shift Indication, CSI) 값으로부터 0,6,3,4,2,8,10,9 총 8가지의 값 중 하나를 받을 수 있으며, 다른 각 레이어를 위한 CS값(

)은 특정 룰에 의해 첫 번째 레이어를 위한 CS값(

)에 오프셋(Δ_k) 형태로 주어지게 된다. 예를 들어, 총 2개의 layer가 존재하여 랭크(rank)가 2인 경우, 첫 번째 레이어를 위한 CS값이

이면, 두 번째 레이어를 위한 CS값은 (

+6)mod 12이다 (이 경우 오프셋 Δ_k는 k=0일 경우 0, k=1일 경우 6이다). 만약에, 총 4개의 layer가 존재(랭크는 4)하는 경우, 첫 번째 레이어를 위한 CS값이

이면, 두 번째 레이어를 위한 CS값은 (

+6)mod 12, 세 번째 레이어를 위한 CS값은 (

+3)mod 12, 네 번째 레이어를 위한 CS값은 (

+9)mod 12이다 (이 경우 오프셋 Δ_k는 k=0일 경우 0, k=1일 경우 6, k=2일 경우 3, k=3일 경우 9이다). 보다 상세히 살펴보면 도 5와 같다.For example, the CS value for the first layer (

) Can receive one of eight values from 0,6,3,4,2,8,10,9 from the 3-bit Cyclic Shift Indication (CSI) value. CS value (

) Is the CS value (

) Is given in the form of an offset Δ _k . For example, if there are two layers in total and the rank is 2, the CS value for the first layer is

If, the CS value for the second layer is (

Mod 6 (in this case the offset Δ _k is 0 when k = 0 and 6 when k = 1). If there are 4 layers in total (rank 4), the CS value for the first layer

If, the CS value for the second layer is (

Mod 6, the CS value for the third layer is (

Mod 3, the CS value for the fourth layer is (

Mod 9 (in this case the offset Δ _k is 0 when k = 0, 6 when k = 1, 3 when k = 2, 9 when k = 3). Looking in more detail as shown in FIG.

5 is a diagram illustrating an example of allocating a CS value for each layer of a user terminal according to one embodiment of the present specification.

이면, 두 번째 레이어를 위한 CS값은 (

+6)mod 12가 된다. (이 경우 오프셋 Δ_k는 k=0일 경우 0, k=1일 경우 6이다). 510 is a rank 2, the CS value for the first layer

If, the CS value for the second layer is (

+6) mod 12 (In this case the offset Δ _k is 0 when k = 0 and 6 when k = 1).

이면, 두 번째 레이어를 위한 CS값은 (

+6)mod 12, 세번째 레이어를 위한 CS값은 (

+3)mod 12, 그리고 네번째 레이어를 위한 CS값은 (

+9)mod 12가 된다. (이 경우 오프셋 Δ_k는 k=0일 경우 0, k=1일 경우 6, k=2일 때 3, k=3일 때 9이다). On the other hand, in case of rank 4 at 520, the CS value for the first layer

If, the CS value for the second layer is (

Mod 6, the CS value for the third layer is (

Mod 12, and the CS value for the fourth layer is (

+9) mod 12 (In this case the offset Δ _k is 0 when k = 0, 6 when k = 1, 3 when k = 2, 9 when k = 3).

의 이격이 최대임은 수학식 2 및 511, 521에서 확인할 수 있다. 물론, 도 5의 520, 521에서 k=0, 1, 2, 3 일때 각각 오프셋을 0, 6, 9, 3으로 할 수도 있다.Calculated by the cyclic shift parameter by 510, 520

It can be seen in Equation 2, 511, and 521 that the maximum separation is. Of course, the offsets may be 0, 6, 9, and 3 when k = 0, 1, 2, and 3 in 520 and 521 of FIG. 5, respectively.

6 is a diagram illustrating an example of allocating a CS value for each layer of a user terminal when the rank is 3 according to an embodiment of the present specification.

이면, 두 번째 레이어를 위한 CS값은 (

+Δ₁)mod 12가 된다. 그리고, 세번째 레이어를 위한 CS값은 (

+Δ₂)mod 12가 된다. Δ₁와 Δ₂가 될 수 있는 값은 옵션 1(CS 할당 방법 1)인 경우와 옵션 2(CS 할당 방법 2)인 경우로 나뉘어질 수 있다.In the case of rank 3, the CS value for the first layer

If, the CS value for the second layer is (

+ Δ ₁ ) mod 12. And the CS value for the third layer is (

+ Δ ₂ ) mod 12. The values that can be Δ ₁ and Δ ₂ may be divided into the case of option 1 (CS allocation method 1) and the case of option 2 (CS allocation method 2).

In the case of option 1, as shown in Equation 3, when k is 0, 1, or 2, the value of Δ _k may be {0, 4, 8} or {0, 8, 4}. On the other hand, in the case of option 2, as shown in Equation 3, when k is 0, 1, 2, the value of Δ _k is {0, 6, 3}, {0, 3, 6}, {0, 6 , 9}, {0, 9, 6}, {0, 9, 3} or {0, 3, 9}. Looking at the separation when the option 1 and option 2 is applied as shown in FIG.

FIG. 7 is a diagram illustrating separation by a cyclic shift parameter when the rank is 3 according to an embodiment of the present specification.

를 확인할 수 있다. 720은 옵션 2인 경우로, Δ_k의 값이 {0, 6, 3}인 경우, 제 1, 2, 3 레이어에 대한

를 확인할 수 있다.710 is option 1, and when Δ _k is {0, 4, 8}, the first, second, and third layers may be

You can check. 720 is option 2, and when Δ _k is {0, 6, 3}, the first, second, and third layers

You can check.

'Option 1' is more orthogonal than 'Option 2' in UL DM-RS considering total 12 CS values, since the distance between CSs can be maximized (the distance of CS values at this time is 4). ) Can be more guaranteed. However, the bandwidth (BW, bandwidth) between two UEs (UE) among MU-MIMO is the same (MU-MIMO with equal sized BW allocation), UE1 uses three layers (rank 3), and UE2 uses one layer. Option 2 can be applied for use (rank 1). This is because if the offset Δ _k is 0, 1, and 2 by 0 for Option 1 for UEs using three layers such as 750, other UEs using one layer may use CS values. Orthogonality is deteriorated because it can only be spaced apart by two from the UE using three layers.

On the other hand, in case of 760 using option 2, offset Δ _{k is set} to 0, 6, 3 when k is 0, 1, and 2, respectively, for UE1 using three layers, and UE2 using one layer is CS. If the value is 9, it can be separated from the UE1 using 3 layers by 3, thereby ensuring more orthogonality than option 2.

That is, the method of increasing the orthogonality of the UL DM-RS according to the access method or access situation of the user terminal may select one of option 1 and option 2.

On the other hand, when the bandwidth (BW, bandwidth) between the two terminals (UE) of the MU-MIMO is different (MU-MIMO with non-equal sized BW allocation), the UL DM-RS sequence between the two terminals uses a different base sequence Done. If the bandwidth is different, the base sequence has a different length, and if the sequence length is different, the base sequence based on the Zadoff-Chu sequence becomes a different sequence. Therefore, it is meaningless to guarantee orthogonality between UEs using CS values. In this case, only orthogonal cover codes (OCC) can guarantee orthogonality between UEs. Therefore, in this case, the distinction due to CS between UEs is meaningless, so Option 1, which more guarantees orthogonality between layers in one UE, is a more suitable method.

That is, Option 1 and Option 2 indicate whether SU-MIMO or MU-MIMO, and MU-MIMO with equal sized BW allocation, or MU-MIMO with non- equal sized BW allocation), i.e., again, orthogonality is provided according to the connection state of the terminal and the characteristics of the allocated frequency domain. The present invention proposes a method for selecting according to a characteristic of an allocated frequency domain and an apparatus for providing the same.In one embodiment, signaling of using option 1 or option 2 may be performed. When signaling is allocated, the amount of information transmitted and received increases, so that option 1 or option 2 can be selected without additional signaling.

In the present specification, the connected state refers to a state in which a user terminal is connected to SU-MIMO or MU-MIMO. In addition, it refers to information on how many layers or ranks a user terminal uses. That is, it means a state of how the user terminals are connected in which frequency band.

According to one embodiment of the present specification, a sequence and sequence group hopping method and a CS allocation method may be linked.

Table 5 Links to Sequence / Sequence Group Hopping Methods and Options

One embodiment of a Sequence / Sequence Group Hopping (SGH) method is cell specific, which operates. Cell-specific is a cell-specific operation. When the hopping method is disabled, all UEs in a cell do not perform SGH. When enabled, all UEs in a cell perform SGH in slot units. It is. And whether or not to do this hopping (disabled / enabled) is signaled by a higher level.

However, in case of using MU-MIMO with non-equal sized BW allocation in which the bandwidth (BW, bandwidth) between two UEs of MU-MIMO is different, OCC is used as a unit, and when the hopping (SGH) method is enabled, slot-based hopping is performed. Even when the base station of the UL DM-RS sequence is changed during hopping, the two UEs are put on the OCC. It will be difficult to distinguish them into sequences. Therefore, a hopping (SGH) scheme for this case (MU-MIMO with non-equal sized BW allocation) is needed and is divided into the following two embodiments.

The SGH scheme according to another embodiment of the present specification is UE specific, that is, it operates by UE. That is, when disabled, the UE does not perform the SGH. When enabled, the UE uses the SGH in slot units. That is, a UE corresponding to MU-MIMO with non-equal sized BW allocation disables hopping (SGH) and is enabled for other UEs.

The SGH scheme according to another embodiment of the present specification is to add a hopping (SGH) scheme in subframe units when enabled. That is, for MU-MIMO with non-equal sized BW allocation, hopping (SGH) is enabled on a subframe basis. Otherwise, when enabled, the same as before. It is done in slots. At this time, the disabled can be applied to both cases.

When applying option 1 discussed earlier, it is appropriate that MU-MIMO with non-equal sized BW allocation is closely related to sequence and sequence group hopping (SGH) for UL DM-RS. will be. Therefore, if Option 1 and Option 2 are linked with the Sequence and Sequence Group Hopping (SGH) method as shown in Table 5 above, a specific rule for allocating CS values to other layers without additional signaling is appropriately selected. Can be used.

및 수학식 2에 의하여

산출한다(S820). 그리고 S830과 같이 UE(단말)은 상위단으로부터 스케쥴링되어 결정된 3bit의 사이클릭 쉬프트 지시(CSI, Cyclic Shift Indication) 값을 기지국 등으로부터 전송받게 되며, 이 3bit의 값은 표 2의 실시예와 같이 DCI 포맷 0의 CS(Cyclic Shift) 필드에 실려서 전송된다. 8 is a diagram illustrating a process of generating a DM-RS sequence by a user terminal selecting a CS allocation rule linked with a sequence and a sequence group hopping scheme according to an embodiment of the present specification. Equation 1 and 2 described above are applied to generate a base sequence based on a zadoff-chu sequence for the UL DM-RS sequence (S810). By the value given by the upper layer

And by equation (2)

It calculates (S820). In addition, as shown in S830, the UE (terminal) receives a 3 bit Cyclic Shift Indication (CSI) value, which is determined by being scheduled from an upper end, from a base station or the like. It is carried in a Cyclic Shift (CS) field of Format 0.

가 산출된다(S840). 즉 첫 번째 레이어를 위한 CS값(

)으로는 3bit의 CSI로부터 0,6,3,4,2,8,10,9 총 8가지의 값 중 하나를 받을 수 있다. 그리고 사용자 단말의 레이어의 수가 몇 개인지, 즉 랭크가 3인지를 확인한다(S845). 본 명세서의 일 실시예에 의하면 랭크는 2, 3, 4가 될 수 있다. The values of the cyclic shift (CS) field thus transmitted are mapped as shown in Table 2 above.

Is calculated (S840). The CS value for the first layer

) Can receive one of eight values from 0,6,3,4,2,8,10,9 from 3bit CSI. In operation S845, the number of layers of the user terminal is determined, that is, the rank is three (S845). According to one embodiment of the present specification, the rank may be 2, 3, or 4.

If the rank is 1, it should work in the same manner as the existing LTE Rel-8, which is not included in the embodiment of the present invention. However, in the embodiment of the present invention may be included when the rank is 1 as well as when the rank is 2, 3, 4, if the rank is 1 it may be operated in the same manner as in the aforementioned LTE Rel-8.

에 오프셋을 더하여 다른 레이어에 대한사이클릭 쉬프트 파라메터 값(

)을 산출한다(S848). 즉, 레이어의 개수가 2개, 4개(랭크가 2 또는 4)일 경우 - 앞서 수학식 3의 1) 또는 2)를 적용하여 CS할당 룰에 따라 다른 레이어를 위한 CS값들을 할당할 수 있다. 다른 각 레이어를 위한 CS값(

)은 특정 룰에 의해 첫 번째 레이어를 위한 CS값(

)에 오프셋(Δ_k) 형태로 주어지게 된다. 예를 들어, 총 2개의 레이어가 존재하여 랭크(rank)가 2인 경우, 첫 번째 레이어를 위한 CS값이

이면, 두 번째 레이어를 위한 CS값은 (

+6)mod 12이다 (이 경우 오프셋 Δ_k 는 k=0일 경우 0, k=1일 경우 6이다). 만약에, 총 4개의 layer가 존재(랭크는 4)하는 경우, 첫 번째 레이어를 위한 CS값이

이면, 두 번째 레이어를 위한 CS값은 (

+6)mod 12, 세 번째 레이어를 위한 CS값은 (

+3)mod 12, 네 번째 레이어를 위한 CS값은 (

+9)mod 12이다 (이 경우 오프셋 Δ_k 는 k=0일 경우 0, k=1일 경우 6, k=2일 경우 3, k=3일 경우 9이다). 이에 대해서는 앞서 도 5에서 살펴보았다.If the rank is not 3, that is, if the rank is 2 or 4, the above equation (3) is applied to the first layer.

Add an offset to the cyclic shift parameter value for the other layer (

) Is calculated (S848). That is, when the number of layers is two or four (rank is 2 or 4)-CS values for other layers can be allocated according to the CS assignment rule by applying 1) or 2) of Equation 3 above. . CS value for each other layer (

) Is the CS value (

) Is given in the form of an offset Δ _k . For example, if there are two layers in total and the rank is 2, the CS value for the first layer is

If, the CS value for the second layer is (

Mod 6 (in this case the offset Δ _k is 0 when k = 0 and 6 when k = 1). If there are 4 layers in total (rank 4), the CS value for the first layer

If, the CS value for the second layer is (

Mod 6, the CS value for the third layer is (

Mod 3, the CS value for the fourth layer is (

Mod 9 (in this case the offset Δ _k is 0 when k = 0, 6 when k = 1, 3 when k = 2, 9 when k = 3). This has been described with reference to FIG. 5.

On the other hand, when the rank is 3, that is, when there are three layers, option 1 or option 2 linked to the sequence and sequence group hopping method may be selected as shown in Table 5 above. The detailed link method will be described later.

에 수학식 3의 옵션 1을 적용하여, 2, 3번째 레이어에 대한

(k = 1, 2)를 계산한다(S852). 앞서 살펴본 바와 같이 오프셋을 {0, 4, 8}로 적용하거나 또는 {0, 8, 4}로 적용할 수 있다.The user terminal checks the sequence and sequence group hopping scheme (S850). When the sequence and sequence group hopping scheme is the first sequence hopping scheme, option 1 described above is applied. For the first layer

Apply Option 1 of Equation 3 to the second and third layers

(k = 1, 2) is calculated (S852). As described above, the offset may be applied as {0, 4, 8} or {0, 8, 4}.

에 수학식 3의 옵션 2을 적용하여, 2, 3번째 레이어에 대한

(k = 1, 2)를 계산한다(S854). 앞서 살펴본 바와 같이 오프셋을 {0, 6, 3}, {0, 3, 6}, {0, 9, 3}, {0, 9, 6}, {0,9,3}, {0,3,9} 중 어느 하나를 적용할 수 있다.Meanwhile, when the sequence and sequence group hopping method is the second sequence hopping method, option 2 described above is applied. For the first layer

Apply option 2 of Equation 3 to the second and third layers

(k = 1, 2) is calculated (S854). As we saw earlier, the offsets are {0, 6, 3}, {0, 3, 6}, {0, 9, 3}, {0, 9, 6}, {0,9,3}, {0,3 , 9} can be applied.

,

를 계산한다(S860). 의 값을 구하기 위한 n_cs에서 파라메터가 되는

과

는 각 기지국(셀 등) 및 슬롯 시간(slot time)에 따라 달라지지만, 동일한 기지국(셀 등) 및 슬롯 시간에서는 고정된 값을 가지므로, 실질적으로 n_cs의 값을 다르게 하는 파라메터는

이다. 즉, 실질적으로 상위단이 단말 별로 스케쥴링하여 기지국 등을 통해 전송하게 되는 파라메터는

이며, 이 값에 따라 UL DM-RS의 CS(Cyclic Shift) 값인 α가 서로 다른 값을 가지게 된다. Hereinafter, each layer based on the value calculated in S820 to S854

,

To calculate (S860). Parameter to n _cs to find the value of

and

Is because of the fixed value in vary with each base station (cell, and so on) and time slot (time slot), the same base station (cell etc.) and the time slot, is substantially different from the value of the parameter that has n _cs

to be. That is, the parameter that is actually transmitted by the upper end is scheduled for each terminal through the base station, etc.

According to this value, α, which is a CS (Cyclic Shift) value of the UL DM-RS, has a different value.

에서 수학식 1에 의해 DM-RS 시퀀스를 생성한다(S870).And the base sequence of S810 and of S860

In step S870, a DM-RS sequence is generated by Equation 1.

The DM-RS sequence generated by Equations 1 and 2 is mapped to a corresponding symbol of each slot, which is mapped through a resource element mapper (S880). When the mapping is completed, an SC-FDMA symbol is generated from a resource element (RE) to which the DM-RS sequence is mapped through an SC FDMA generator to transmit a DM-RS signal to a base station (S890).

에 소정의 오프셋을 더하여 각각의 레이어별 사이클릭 쉬프트 파라메터의 값을 산출하는 과정을 살펴보았다. 보다 상세히, 랭크가 3인 경우에 시퀀스 및 시퀀스 그룹 호핑 방식이 어떤 방식이냐에 따라 해당 시퀀스 및 시퀀스 그룹 호핑 방식에 링크된 옵션 1 또는 옵션 2를 적용하여 오프셋을 더하여 2, 3번째 레이어별 사이클릭 쉬프트 파라메터의 값을 산출함을 살펴보았다. 그런데, 시퀀스 및 시퀀스 그룹 호핑 방식과 옵션 1, 2가 링크되는 방식은 다양하므로, 이에 대해 보다 상세히 살펴보고자 한다. 8 is a cyclic shift parameter of the first layer according to the rank of the user terminal

The process of calculating the value of the cyclic shift parameter for each layer by adding a predetermined offset to is described. More specifically, if the rank is 3, depending on how the sequence and sequence group hopping scheme is applied, the offset is added by applying option 1 or option 2 linked to the sequence and sequence group hopping scheme, and the second and third layer cyclics are applied. We have seen that the value of the shift parameter is calculated. However, since a sequence and sequence group hopping scheme and options 1 and 2 are linked in various ways, this will be described in more detail.

9 is a diagram illustrating an example of selecting a CS allocation rule for each layer according to a type of a sequence and a sequence group hopping scheme according to an embodiment of the present specification. In the present invention, one of the following three types of sequence and sequence group hopping schemes is selected and fixedly used. That is, it is to be understood that the sequence and sequence group hopping schemes do not selectively identify and apply one of the following three types, but one of three types may be fixedly selected and used according to a communication standard or system specification. .

Looking at the three types of hopping method to which the present invention can be applied in more detail as follows.

Type A is a case in which hopping of a sequence and a sequence group is divided into two types of inactivation and activation as described above. This may uniformly select whether to activate or deactivate sequence and sequence group hopping for all user terminals in the cell. In addition, as described above, UE-specific means that hopping is deactivated for UEs of non-uniform frequency bands and hopping for other user terminals. In this case, the hopping in the A type is a hopping in a slot unit. Therefore, it is checked whether sequence and sequence group hopping are inactive (S920). If both sequence and sequence group hopping are inactive, this corresponds to the first hopping method and selects option 1 (S924). That is, it increases the size of the separation for each layer in the terminal, which is a case of unequal frequency bandwidth among MU-MIMO. If at least one of the sequence and the sequence group hopping is not inactive, option 2 is selected (S926). This increases the separation between terminals and may be applied to the case of the uniform frequency bandwidth of the MU-MIMO.

In other words, if both sequence and sequence group hopping are deactivated in S920, the cyclic shift allocation rule selects to maximize the distinction for each layer of the user terminal. And if at least one of the sequence and sequence group hopping is active, the cyclic shift assignment rule selects to maximize the distinction between the user terminal and another user terminal.

In this case, when the user terminal accesses with MU-MIMO of non-uniform frequency band, deactivates both sequence and sequence group hopping of the user terminal, and other user terminals in a cell have one of sequence and sequence group hopping in units of slots. The abnormality can be activated.

Type B is a first embodiment for setting sequence and sequence group hopping on a subframe level basis. Only user terminals using non-uniform frequency bands of MU-MIMO can be activated in subframe units, and in other cases, slot units. In the case of deactivation, both can be applied. In S930 of FIG. 9, the deactivation and the activation of subframe hopping are linked to the same option. That is, in setting up sequence and sequence group hopping, adding a subframe hopping upon activation. The first hopping method means enabling both sequence and sequence group hopping to be inactive or hopping on a subframe basis. In this case, the second hopping scheme means activation in which one or more of the sequence and the sequence group hopping hops in units of slots. Therefore, it is checked whether the sequence and the sequence group hopping are inactivated or subframe unit activated (S930). If both sequence and sequence group hopping are inactive or subframe-based activation, this corresponds to the first hopping method and selects option 1 (S934). That is, it increases the size of the separation for each layer in the terminal, which is a case of unequal frequency bandwidth among MU-MIMO. On the other hand, if at least one of the sequence and sequence group hopping is slot unit activation, option 2 is selected (S936). This increases the separation between terminals and may be applied to the case of the uniform frequency bandwidth of the MU-MIMO.

In other words, when the sequence and the sequence group hopping are both deactivated or activated on a subframe basis in S930, the cyclic shift allocation rule selects to maximize the distinction of each layer of the first user terminal. In addition, when at least one of the sequence and the sequence group hopping is activated on a slot basis, the cyclic shift allocation rule selects to maximize the distinction between the user terminal and another user terminal.

The C type is a second embodiment for setting sequence and sequence group hopping on a subframe level basis. Like the B-type, MU-MIMO may enable subframe hopping only for a user terminal using an uneven frequency band, and in other cases, may activate per slot. In the case of deactivation, both can be applied. In S940 of FIG. 9, the deactivation and the activation of slot-by-slot hopping are linked to the same option. That is, in setting up sequence and sequence group hopping, by adding subframe hopping during activation, the first hopping method means activation so that both sequence and sequence group hopping hopping on a subframe basis. The hopping scheme means activation or deactivation in which at least one of sequence and sequence group hopping hops on a slot basis. Therefore, it is checked whether the sequence and the sequence group hopping are activated per subframe (S940). If both sequence and sequence group hopping are subframe-based activations, this corresponds to the first hopping method and selects option 1 (S944). That is, it increases the size of the separation for each layer in the terminal, which is a case of unequal frequency bandwidth among MU-MIMO. On the other hand, if at least one of sequence and sequence group hopping is inactive or slot-by-slot activation, option 2 is selected (S946). This increases the separation between terminals and may be applied to the case of the uniform frequency bandwidth of the MU-MIMO.

In other words, when both the sequence and the sequence group hopping are activated in subframes in S940, the cyclic shift allocation rule selects to maximize the distinction for each layer of the user terminal. And, if at least one of the sequence and sequence group hopping is deactivated or activated on a slot basis, the cyclic shift assignment rule selects to maximize the distinction between the user terminal and another user terminal.

The cyclic shift parameters for the second and third layers are calculated by applying the options selected in steps S924, S926, S934, S936, S944, and S946 (S950).

In more detail, when the rank of the user terminal is 3 and each layer is the first, second, and third layers, option 1 may be selected when the first hopping method is used. The cyclic shift assignment rule for maximizing the distinction per layer of the first user terminal may include any one of an offset set {0, 4, 8}, {0, 8, 4} in the cyclic shift parameter determined for the first layer. According to an embodiment of the present invention, one set is used to calculate a cyclic shift parameter to be applied to the second layer and the third layer.

In detail, when the rank of the user terminal is 3 and each layer is the first, second, and third layers, option 2 may be selected when the second hopping method is used. In addition, the cyclic shift assignment rule for maximizing the distinction between the user terminal and another user terminal is offset set {0, 6, 3}, {0, 3, 6} to the determined cyclic shift parameter for the first layer. , Any one of {0, 6, 9}, {0, 9, 6}, {0,9,3}, {0,3,9} to apply to the second and third layers According to an embodiment of the present invention, a cyclic shift parameter is calculated.

10 is a diagram illustrating a process of receiving a reference signal from a user terminal in a base station according to one embodiment of the present specification.

The base station generates a control signal capable of indicating a first cyclic shift value for the first layer with respect to a user terminal using two or more layers (S1005), and transmits the generated control signal to the corresponding terminal (S1010). ).

Next, the base station receives a reference signal generated and transmitted by the user terminal according to a rank of the user terminal and / or a sequence applied to the user terminal and a sequence hopping scheme (S1015).

In S1015, a process for a reference signal generated and transmitted by the user terminal according to a rank of the user terminal and / or a sequence and a sequence hopping scheme of the user terminal will be described in more detail as follows.

The user terminal uses two or more layers and calculates a first cyclic shift parameter for the first layer from the control information received from the base station, and checks the sequence and the sequence group hopping method of the user terminal. Select a cyclic shift assignment rule linked to the group hopping method, calculate a cyclic shift parameter to be applied to each layer using the selected assignment rule and the first cyclic shift parameter, and then calculate for each layer. Each cyclic shift parameter can be used to generate and transmit a reference signal.

In addition, the user terminal calculates a first cyclic shift parameter for the first layer of the at least two layers from the control information received from the base station, the rank of the first user terminal is 3 and the sequence and sequence group of the first user terminal When the hopping method is the first hopping method, the cyclic shift allocation rule is selected to maximize the distinction of each layer of the first user terminal. The rank of the first user terminal is 3, and the sequence and sequence group of the first user terminal are When the hopping method is the second hopping method, the cyclic shift allocation rule is selected to maximize the distinction between the first user terminal and another user terminal. Next, after calculating the cyclic shift parameters to be applied to layers other than the first layer by using the selected cyclic shift assignment rule, the reference signal is applied to each layer by using the respective cyclic shift parameters. Can be created and sent.

FIG. 11 is a diagram for selecting a cyclic shift allocation rule for a user terminal receiving a cyclic shift parameter for a first layer from a base station and calculating a cyclic shift parameter to be applied to another layer according to an embodiment of the present disclosure; Shows a process of generating a reference signal. In this process, the cyclic shift assignment rule linked to the sequence and sequence group hopping method is selected.

A first user terminal using two or more layers calculates a first cyclic shift parameter for the first layer from control information received from the base station (S1110). In operation S1120, the rank of the first user terminal is checked. If the rank of the first user terminal is 2 or 4, the cyclic shift allocation rule is selected to maximize the distinction for each layer of the first user terminal (S1130). If the rank of the first user terminal is 3, as described above, the cyclic shift allocation rule linked to the sequence and sequence group hopping method is selected. Looking in more detail as follows.

When the sequence and the sequence group hopping method of the user terminal are the first hopping method, the cyclic shift allocation rule is selected to maximize the distinction of each layer of the first user terminal (S1140). On the other hand, when the sequence of the user terminal and the sequence group hopping method is the second hopping method, the cyclic shift allocation rule is selected to maximize the distinction between the user terminal and another user terminal (S1150).

As described above, one embodiment of the first hopping method may be a subframe-based activation method, and one embodiment of the second hopping method may be a slot-based activation method. In case of inactivation, option 1 may be selected or option 2 may be selected according to a standard setting direction of a communication system.

The cyclic shift parameter to be applied to layers other than the first layer is calculated using the selected cyclic shift allocation rule (S1160). In operation S1170, a reference signal is generated using each cyclic shift parameter for each layer. Thereafter, the generated reference signal is transmitted to the base station (S1180).

Options 1 and 2 are as follows. When the rank of the user terminal is 3 and each layer is a first, second, or third layer, option 1 may be selected when the first hopping method is used. Option 1 means a cyclic shift allocation rule that maximizes the distinction of each user layer. That is, in S1160, the second layer and the third layer are applied by applying any one set of offset sets {0, 4, 8}, {0, 8, 4} to the determined cyclic shift parameter with respect to the first layer. This will calculate the cyclic shift parameters that apply to.

Meanwhile, when the rank of the user terminal is 3 and each layer is the first, second, or third layer, option 2 may be selected when the second hopping method is used, and option 2 maximizes the distinction between the user terminal and another user terminal. Cyclic shift assignment rule. That is, in S1160, an offset set {0, 6, 3}, {0, 3, 6}, {0, 6, 9}, {0, 9, 6}, in the cyclic shift parameter determined for the first layer The cyclic shift parameter to be applied to the second layer and the third layer is calculated by applying any one of {0,9,3} and {0,3,9}.

FIG. 12 is a diagram illustrating a cyclic shift assignment rule in which a user terminal according to another embodiment of the present disclosure receives a cyclic shift parameter for a first layer from a base station and calculates a cyclic shift parameter to be applied to another layer. Shows a process of generating a reference signal.

First, a user terminal using two or more layers calculates a first cyclic shift parameter for a first layer from control information received from a base station (S1205). In operation S1210, the cyclic shift allocation rule linked to the frequency hopping method is selected by checking the sequence and sequence group hopping method of the first user terminal.

Referring to step S1210 in more detail, as shown in Figure 9, when the sequence and sequence group hopping is any one of the A, B, C type according to the communication standard or communication system specification, Is to select a click shift assignment rule. Since this is similar to that described with reference to FIG. 9, a detailed description thereof will be omitted to avoid duplication.

Next, the terminal calculates a cyclic shift parameter to be applied to each layer (second layer, third layer, ...) using the selected cyclic shift allocation rule and the first cyclic shift parameter (S1215).

Next, a reference signal is generated using each cyclic shift parameter calculated for each layer (S1220), and the generated reference signal is transmitted to the base station eNB (S1225).

FIG. 13 is a diagram illustrating a configuration of an apparatus for receiving a reference signal generated / transmitted using a sequence and a sequence hopping scheme in a MIMO environment according to an embodiment of the present specification. 13 may be a base station or a device coupled to a base station.

The overall configuration of the reference signal receiver may include a control signal generator 1310, a control signal transmitter 1320, and a reference signal receiver 1330 that receives a reference signal generated / transmitted using a sequence hopping scheme. have.

The control signal generator 1310 performs a function of generating a control signal capable of indicating a first cyclic shift value for the first layer to a user terminal using two or more layers.

The control signal transmitter 1320 transmits the control signal generated by the control signal generator 1310 to the corresponding terminal.

The reference signal receiver 1330 performs a function of receiving a reference signal generated and transmitted by the user terminal according to a rank of the user terminal and / or a sequence and sequence hopping scheme of the user terminal according to FIGS. 9 and 11. .

A configuration in which the user terminal generates the reference signal according to the rank of the user terminal and / or the sequence and sequence hopping scheme of the user terminal will be described in more detail as follows.

The user terminal uses two or more layers and calculates a first cyclic shift parameter for the first layer from the control information received from the base station, and checks the sequence and the sequence group hopping method of the user terminal. Select a cyclic shift assignment rule linked to the group hopping method, calculate a cyclic shift parameter to be applied to each layer using the selected assignment rule and the first cyclic shift parameter, and then calculate for each layer. Each cyclic shift parameter can be used to generate and transmit a reference signal.

In addition, the user terminal calculates a first cyclic shift parameter for the first layer of the at least two layers from the control information received from the base station, the rank of the first user terminal is 3 and the sequence and sequence group of the first user terminal When the hopping method is the first hopping method, the cyclic shift allocation rule is selected to maximize the distinction of each layer of the first user terminal. The rank of the first user terminal is 3, and the sequence and sequence group of the first user terminal are When the hopping method is the second hopping method, the cyclic shift allocation rule is selected to maximize the distinction between the first user terminal and another user terminal. Next, after calculating the cyclic shift parameters to be applied to layers other than the first layer by using the selected cyclic shift assignment rule, the reference signal is applied to each layer by using the respective cyclic shift parameters. Can be created and sent.

14 is a diagram illustrating a configuration of an apparatus for transmitting a reference signal using sequence and sequence group hopping information in a MIMO environment according to an embodiment of the present specification. The configuration of FIG. 14 may be a user terminal or an apparatus coupled to the user terminal. 8, 9, and 11, the function or configuration of the apparatus of FIG. 14 may be confirmed. Looking in more detail as follows.

14 includes a receiver 1410, a cyclic shift parameter calculator 1420, a sequence and sequence group hopping information calculator 1430, a cyclic shift assignment rule selector 1440, and a cyclic shift parameter for each layer. The unit 1450 includes a reference signal generator 1460 and a transmitter 1470. In the receiving unit 1410, a user terminal using two or more layers receives control information from a base station. One embodiment of the control information is 3 bit information of the cyclic shift field in the DCI format 0 described above.

In the control information received by the receiver 1410, the cyclic shift parameter calculator 1420 calculates a first cyclic shift parameter for the first layer. The sequence and sequence group hopping information calculator 1430 calculates information about the sequence and sequence group hopping method.

According to an embodiment of the present invention, when the rank of the first user terminal is 2 or 4, the cyclic shift assignment rule selecting unit 1440 maximizes the distinction for each layer of the first user terminal. If the rank of the first user terminal is 3 and the sequence and sequence group hopping method of the user terminal is the first hopping method, the cyclic shift allocation rule for maximizing the distinction for each layer of the first user terminal is selected. If the rank of the first user terminal is 3 and the sequence and sequence group hopping method of the user terminal is the second hopping method, the cyclic shift allocation rule is selected to maximize the distinction between the user terminal and another user terminal. do.

The cyclic shift parameter calculator 1450 for each layer calculates a cyclic shift parameter to be applied to layers other than the first layer by using the selected cyclic shift assignment rule.

The reference signal generator 1460 generates a reference signal using each cyclic shift parameter for each layer, and the transmitter 1470 transmits the generated reference signal to the base station.

Here, the first hopping method may be a subframe unit activation method, and the second hopping method may be a slot unit activation method.

The device of FIG. 14 may be configured as follows according to another embodiment of the present specification.

In the receiving unit 1410, a user terminal using two or more layers receives control information from a base station. One embodiment of the control information is 3 bit information of the cyclic shift field in the DCI format 0 described above.

In the control information received by the receiver 1410, the cyclic shift parameter calculator 1420 calculates a first cyclic shift parameter for the first layer.

The frequency hopping information calculator 1430 calculates information about the frequency hopping method.

According to an embodiment of the present invention, the cyclic shift assignment rule selector 1440 selects the cyclic shift assignment rule linked to the frequency hopping method identified by the frequency hopping information calculator 1430.

The cyclic shift parameter calculator 1450 for each layer calculates a cyclic shift parameter to be applied to each layer by using the selected allocation rule and the first cyclic shift parameter.

The reference signal generator 1460 generates a reference signal using each cyclic shift parameter for each layer, and the transmitter 1470 transmits the generated reference signal to the base station.

Here, the first hopping method and the second hopping method may vary according to a setting direction of a standard in a communication system. As described above with reference to FIG. 9, the first hopping method and the second hopping method are divided according to each type, and the base station can determine the cyclic shift parameter by referring to the cyclic shift assignment rule linked to each hopping method. have.

On the other hand, the cyclic shift allocation rule selector 1430 and the cyclic shift parameter calculator 1450 for each layer are the user terminal when the rank of the user terminal is three and each layer is the first, second, or third layer. A cyclic shift allocation rule may be applied to maximize the layer-specific discrimination of the layer, and any one of an offset set {0, 4, 8}, {0, 8, 4} may be applied to the determined cyclic shift parameter for the first layer. One set may be applied to determine a cyclic shift parameter to be applied to the second layer and the third layer. This is an allocation rule linked to the first hopping method. In addition, a cyclic shift allocation rule for maximizing the discrimination between the user terminal and another user terminal may be applied, and offset sets {0, 6, 3}, and {0 may be applied to the determined cyclic shift parameter for the first layer. , 3, 6}, {0, 6, 9}, {0, 9, 6}, {0,9,3}, {0,3,9} by applying a set of any one of the second layer and The cyclic shift parameter to be applied to the third layer may be determined. This is the rule linked to the second hopping method.

According to one embodiment of the present specification, therefore, it is possible to appropriately select and write a specific rule for allocating a CS value to another layer without additional signaling. That is, not only one of the two CS allocation methods (options 1 and 2) is used, but the terminal may check this without signaling what to use for the selective writing in some cases. This is in line with the purpose of creating a specific rule for allocating a CS value to another layer to exclude additional signaling, and does not give additional signaling to select and write the specific rule more appropriately. Is not increased.

According to an embodiment of the present specification, a method and apparatus for allocating a cyclic shift (CS) value in each layer of an uplink (UL) demodulation reference signal (DM-RS) In C, a Cyclic Shift (CS) value of a first layer is determined from a Cyclic Shift Indication (CSI) value received from a base station, and the UL DM received from the base station is determined from the value. Cyclic shifts of different layers according to CS allocation rules, which can be selected differently according to the sequence and sequence group hopping (SGH) pattern of RS A method and apparatus for allocating a (Cyclic Shift, CS) value without additional signaling may be provided.

In the above description, all elements constituting the embodiments of the present invention are described as being combined or operating in combination, but the present invention is not necessarily limited to the embodiments. In other words, within the scope of the present invention, all of the components may be selectively operated in combination with one or more. In addition, although all of the components may be implemented in one independent hardware, each or all of the components may be selectively combined to perform some or all functions combined in one or a plurality of hardware. It may be implemented as a computer program having a. Codes and code segments constituting the computer program may be easily inferred by those skilled in the art. Such a computer program may be stored in a computer readable storage medium and read and executed by a computer, thereby implementing embodiments of the present invention. The storage medium of the computer program may include a magnetic recording medium, an optical recording medium, a carrier wave medium, and the like.

In addition, the terms "comprise", "comprise" or "having" described above mean that the corresponding component may be included, unless otherwise stated, and thus excludes other components. It should be construed that it may further include other components instead. All terms, including technical and scientific terms, have the same meanings as commonly understood by one of ordinary skill in the art unless otherwise defined. Terms commonly used, such as terms defined in a dictionary, should be interpreted to coincide with the contextual meaning of the related art, and shall not be construed in an ideal or excessively formal sense unless explicitly defined in the present invention.

The foregoing description is merely illustrative of the technical idea of the present invention, and various changes and modifications may be made by those skilled in the art without departing from the essential characteristics of the present invention. Therefore, the embodiments disclosed in the present invention are not intended to limit the technical idea of the present invention but to describe the present invention, and the scope of the technical idea of the present invention is not limited by these embodiments. The protection scope of the present invention should be interpreted by the following claims, and all technical ideas within the equivalent scope should be interpreted as being included in the scope of the present invention.

Claims (12)

Calculating, by a user terminal using two or more layers, a first cyclic shift parameter for the first layer from control information received from the base station;
If the rank of the first user terminal is 3 and the sequence and sequence group hopping method of the first user terminal is the first hopping method, the cyclic shift allocation rule is selected to maximize the distinction per layer of the first user terminal.
If the rank of the first user terminal is 3 and the sequence and sequence group hopping method of the first user terminal is the second hopping method, the cyclic shift allocation rule is selected to maximize the distinction between the first user terminal and the other user terminal. Making;
Calculating cyclic shift parameters to be applied to layers other than the first layer by using the selected cyclic shift assignment rule;
Generating a reference signal for each layer by using each cyclic shift parameter; And
And transmitting the generated reference signal to the base station, using the sequence and sequence group hopping information in a MIMO environment.
The method of claim 1,
The first hopping method may include a subframe-based activation method. The second hopping method may include a slot-based activation method. In the MIMO environment, reference signals using sequence and sequence group hopping information may be used. How to produce.
The method of claim 1,
When the rank of the first user terminal is 3 and each layer is a first, second, or third layer, calculating the cyclic shift parameter to be applied to the other layer is
If the selected allocation rule is a cyclic shift allocation rule for maximizing the distinction of each layer of the first user terminal, the offset set {0, 4, 8}, {to the first cyclic shift parameter calculated for the first layer; Calculating a cyclic shift parameter to be applied to the second layer and the third layer by applying any one of 0, 8, and 4} or
If the selected allocation rule is a cyclic shift allocation rule that maximizes the distinction between the first user terminal and the other user terminal, an offset set {0, 6, 3} to the first cyclic shift parameter calculated for the first layer. , {0, 3, 6}, {0, 6, 9}, {0, 9, 6}, {0,9,3}, {0,3,9} by applying any one set A method of generating a reference signal using sequence and sequence group hopping information in a MIMO environment, comprising any one of calculating a cyclic shift parameter to be applied to a second layer and a third layer.
Calculating, by a user terminal using two or more layers, a first cyclic shift parameter for the first layer from control information received from the base station;
Identifying a sequence and sequence group hopping method of the user terminal and selecting a cyclic shift assignment rule linked to the identified sequence and sequence group hopping method;
Calculating a cyclic shift parameter to be applied to each layer by using the selected allocation rule and the first cyclic shift parameter;
Generating a reference signal using each cyclic shift parameter calculated for each layer; And
And transmitting the generated reference signal to the base station, using the sequence and sequence group hopping information in a MIMO environment.
The method of claim 4, wherein
When both the sequence and the sequence group hopping method are deactivated, the selected cyclic shift assignment rule maximizes the distinction per layer of the user terminal.
When at least one of the sequence and sequence group hopping method is activated, the selected cyclic shift assignment rule maximizes the distinction between the user terminal and another user terminal. Sequence and sequence group hopping information in a MIMO environment. Reference signal generation method using.
The method of claim 4, wherein
If both the sequence and sequence group hopping methods are deactivated or activated on a subframe basis, the selected cyclic shift allocation rule may maximize the layer-specific distinction of the user terminal.
If at least one of the sequence and sequence group hopping method is activated on a per-slot basis, the selected cyclic shift assignment rule maximizes the distinction between the user terminal and another user terminal. A method of generating a reference signal using group hopping information.
The method of claim 4, wherein
When the sequence and the sequence group hopping method are both activated on a subframe basis, the selected cyclic shift allocation rule may maximize the distinction per layer of the user terminal.
If one or more of the sequence and sequence group hopping methods are deactivated or activated on a slot basis, the selected cyclic shift assignment rule maximizes the distinction between the user terminal and another user terminal. And a reference signal generation method using sequence group hopping information.
The method according to any one of claims 5, 6 and 7
If the rank of the user terminal is 3 and each layer is the first, second, third layer,
The cyclic shift assignment rule for maximizing the distinction per layer of the user terminal is based on the offset set {0, 4, 8}, {0, 8, 4} in the calculated first cyclic shift parameter for the first layer. Calculating a cyclic shift parameter to be applied to the second layer and the third layer by applying any one set,
The cyclic shift assignment rule for maximizing the distinction between the user terminal and another user terminal may include offset set {0, 6, 3}, {0, 3, 6}, {to the cyclic shift parameter determined for the first layer. 0, 6, 9}, {0, 9, 6}, {0,9,3}, {0,3,9} by applying any one of the set to the second layer and the third layer A method of generating a reference signal using sequence and sequence group hopping information in a MIMO environment, characterized by calculating a click shift parameter.
A receiving unit included in a user terminal using two or more layers, and receiving control information from a base station;
A cyclic shift parameter calculator configured to calculate a first cyclic shift parameter for a first layer from control information received by the receiver;
A sequence and sequence group hopping information calculator for calculating information about the sequence and sequence group hopping method;
If the rank of the first user terminal is 2 or 4, the cyclic shift allocation rule for maximizing the distinction per layer of the first user terminal is selected, and the rank of the first user terminal is 3 and the rank of the first user terminal When the sequence and sequence group hopping method is the first hopping method, the cyclic shift allocation rule is selected to maximize the distinction of each layer of the first user terminal. The rank of the first user terminal is 3 and the first user terminal is selected. If the sequence and sequence group hopping method is the second hopping method, the cyclic shift assignment rule selecting unit selecting a cyclic shift assignment rule for maximizing the distinction between the first user terminal and another user terminal;
A cyclic shift parameter calculator for each layer that calculates cyclic shift parameters to be applied to layers other than the first layer by using the selected cyclic shift assignment rule;
A reference signal generator for generating a reference signal for each layer by using each cyclic shift parameter; And
And a transmitter for transmitting the generated reference signal to the base station, wherein the reference signal generation apparatus uses sequence and sequence group hopping information in a MIMO environment.
A receiving unit included in a user terminal using two or more layers, and receiving control information from a base station;
A cyclic shift parameter calculator configured to calculate a first cyclic shift parameter for a first layer from the received control information;
A sequence and sequence group hopping information calculator for calculating information about the sequence and sequence group hopping method;
A cyclic shift assignment rule selector for selecting a cyclic shift assignment rule linked to the sequence and sequence group hopping method identified by the sequence and sequence group hopping information calculation unit;
A cyclic shift parameter calculator for each layer that calculates a cyclic shift parameter to be applied to each layer by using the selected allocation rule and the first cyclic shift parameter;
A reference signal generator configured to generate a reference signal using each cyclic shift parameter calculated for each layer; And
And a transmitter for transmitting the generated reference signal to the base station. Generating a control signal capable of indicating a first cyclic shift value for the first layer for a user terminal using two or more layers;
Transmitting the generated control signal to a corresponding terminal; And,
Receiving a reference signal generated and transmitted by the user terminal according to a rank and / or a sequence and a sequence hopping scheme applied to the user terminal, the sequence and sequence group hopping information in a MIMO environment. Reference signal reception method using. A control signal generator configured to generate a control signal capable of indicating a first cyclic shift value for the first layer with respect to a user terminal using two or more layers;
A control signal transmitter for transmitting the generated control signal to a corresponding terminal; And,
Sequence and sequence group hopping in a MIMO environment, comprising a reference signal receiver for receiving a reference signal generated and transmitted by the user terminal according to the rank and / or sequence and sequence hopping scheme applied to the user terminal Reference signal receiving apparatus using the information.

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