KR101784130B1 - Method and Apparatus for Transmitting and Receiving of Cyclic Shift Parameter for Supporting Orthogonality in Multiple Input Multiple Output - Google Patents

Abstract

The present disclosure relates to a method and apparatus for transmitting and receiving cyclic shift parameters that provide orthogonality in a MIMO environment.
A method of transmitting a cyclic shift parameter for providing orthogonality in a MIMO environment according to an exemplary embodiment of the present invention includes determining cyclic shift parameters of at least one user terminal and determining a cyclic shift parameter Determining a parameter, and transmitting the determined cyclic shift parameter to the user terminal.

Description

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a method and apparatus for transmitting and receiving a cyclic shift parameter that provides orthogonality in a MIMO environment,

The present disclosure relates to wireless communication systems and, more particularly, to a method and apparatus for transmitting and receiving cyclic shift parameters that provide orthogonality in a MIMO environment.

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

In a mobile communication system such as the current 3GPP family Long Term Evolution (LTE) and LTE-A (LTE Advanced), a high-speed and large-capacity communication system capable of transmitting and receiving various data such as video and wireless data, , It is necessary to develop a technology capable of transmitting large-capacity data in accordance with a wired communication network, and an appropriate error detection method that can improve the system performance by minimizing loss of information loss and increasing system transmission efficiency is an essential element .

In addition, in various current communication systems, various reference signals are used to provide information on a communication environment through an uplink or a downlink to an external device.

For example, in an LTE system, which is one of mobile communication methods, a UE is referred to as a 'UE' or 'UE' in order to grasp channel information for demodulation of a data channel in an uplink (UL) Transmits an uplink demodulation reference signal (UL DM-RS) as a reference signal every slot. Also, a sounding reference signal is transmitted to a base station apparatus as a channel estimation reference signal indicating a channel state of the terminal, and a reference signal or a reference signal (CRS) (Cell-specific Reference Signal) for each subframe.

In general, the reference signals are periodically generated by a transmission apparatus of a reference signal, that is, a UE in case of an uplink reference signal and a base station apparatus in the case of a downlink reference signal, and transmitted to a reference signal receiving apparatus .

In addition, the reference signals up to now are generated in such a manner that a plurality of sequences are generated by varying the phase in a complex manner using a constant cyclic shift.

However, in recent years, a demand has arisen for extending the reference signal or sequence for reasons of the flexibility of the communication system or the like.

One embodiment of the present invention is to provide a technique for transmitting and receiving cyclic shift parameters that provide orthogonality in a MIMO environment.

Another embodiment of the present invention is to provide a technique for transmitting and receiving a cyclic shift parameter so that a reference signal can be generated without separately transmitting information related to orthogonality.

A method of transmitting a cyclic shift parameter for providing orthogonality in a MIMO environment according to an exemplary embodiment of the present invention includes determining cyclic shift parameters of at least one user terminal and determining a cyclic shift parameter Determining a parameter, and transmitting the determined cyclic shift parameter to the user terminal.

A method for receiving a cyclic shift parameter for providing orthogonality in a MIMO environment according to another embodiment of the present invention and transmitting a reference signal includes receiving, from control information received from a base station of a user terminal using two or more layers, Calculating a cyclic shift parameter for each of the remaining layers in the first layer, calculating information on orthogonality of the first layer in the cyclic shift parameter for the first layer, Selecting an orthogonality allocation rule to be applied to calculate information related to orthogonality of the remaining layers, applying the selected orthogonality allocation rule to information related to the orthogonality of the first layer, Calculating information, Generating a reference signal for the first layer using information related to a cyclic shift parameter for the first layer and orthogonality for the first layer, and generating a reference signal for the first layer and a cyclic shift parameter for each of the remaining layers, Generating a reference signal for each of the remaining layers using information related to orthogonality for each of the layers; and transmitting the generated reference signal to the base station.

An apparatus for transmitting a cyclic shift parameter for providing orthogonality in a MIMO environment according to another embodiment of the present invention includes a user terminal configuration state determination unit for determining a multiple access state of at least one user terminal, Determining an orthogonality allocation rule according to a connection state, determining a cyclic shift parameter capable of calculating information related to orthogonality according to a multiple access state of the determined user terminal and the determined orthogonality allocation rule, A shift parameter determining unit, a signal generating unit for generating a signal for transmitting the control information including the determined cyclic shift parameter to the user terminal, and a transmitting and receiving unit transmitting the signal to the user terminal.

A user terminal receiving a cyclic shift parameter for providing orthogonality in a MIMO environment according to another embodiment of the present invention and transmitting a reference signal includes a receiver for receiving control information from a base station, A cyclic shift parameter extracting unit for extracting a cyclic shift parameter for the first layer from the control signal received by the receiving unit, a calculation unit for calculating information related to the orthogonality of the first layer in the cyclic shift parameter for the received first layer An orthogonality allocation rule selector for selecting an orthogonality allocation rule to be applied to calculate information related to orthogonality of the remaining layers, an orthogonality allocation rule selector for selecting orthogonality allocation rules for calculating orthogonality of the remaining layers in the cyclic shift parameter for the first layer, Click-shift parameters A layer-by-layer information calculation unit for calculating information related to orthogonality of each of the remaining layers by applying the selected orthogonality allocation rule to information related to the orthogonality of the first layer, Parameters and information related to orthogonality with respect to the first layer to generate a reference signal for the first layer, and generates a cyclic shift parameter for each of the remaining layers and information related to orthogonality for each of the remaining layers A reference signal generator for generating a reference signal for each of the remaining layers using the generated reference signal, and a transmitter for transmitting the generated reference signal to the base station.

1 illustrates a wireless communication system to which embodiments of the present invention are applied.
2A shows subframes and time slot structures of transmission data that can be applied to embodiments of the present invention.
2B shows a general structure of a time-slot according to an embodiment of the present invention.
3 is a diagram illustrating a process in which a UE generates a DM-RS sequence in an LTE environment.
4 is a diagram of an orthogonality assignment rule according to an embodiment of the present invention.
5 is a diagram illustrating a process of setting and transmitting control information so that a UE can derive an OCC allocation rule at a base station according to an embodiment of the present invention.
FIG. 6 is a diagram illustrating a process in which a UE inferences OCC and orthogonality allocation rules from control information transmitted from a base station according to an embodiment of the present invention. Referring to FIG.
7 is a diagram illustrating a process in which a UE selects an orthogonality allocation rule and calculates an OCC according to control information transmitted from a base station in an embodiment of the present invention.
8 is a diagram illustrating a process in which a UE selects an orthogonality allocation rule and calculates an OCC in control information transmitted from a base station in a MU-MIMO according to an embodiment of the present invention.
9 is a diagram illustrating a process of providing the UE with an implicit method in which the UE can infer the orthogonality allocation rule in the process of assigning a CS value to the base station.
10 is a diagram illustrating a process in which a UE selects an orthogonality allocation rule and calculates an OCC in control information transmitted from a base station in a MU-MIMO according to another embodiment of the present invention.
11 is a diagram of a configuration of an apparatus for transmitting a cyclic shift parameter that provides orthogonality according to an embodiment of the present invention.
12 is a diagram illustrating a configuration of an apparatus for receiving a cyclic shift parameter that provides orthogonality according to an embodiment of the present invention and transmitting a reference signal that satisfies orthogonality.

Hereinafter, some embodiments of the present invention will be described in detail with reference to exemplary drawings. It should be noted that, in adding reference numerals to the constituent elements of the drawings, the same constituent elements are denoted by the same reference numerals whenever possible, even if 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 describing the components of the present invention, terms such as first, second, A, B, (a), and (b) may be used. These terms are intended to distinguish the constituent elements from other constituent elements, and the terms do not limit the nature, order or order of the constituent elements. When a component is described as being "connected", "coupled", or "connected" to another component, the component may be directly connected to or connected to the other component, It should be understood that an element 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, packet data, and the like.

Referring to FIG. 1, a wireless communication system includes a user equipment (UE) 10 and a base station (BS) 20. The terminal 10 and the base station 20 apply the extended reference signal generation technique for channel training as described in the embodiment to be described below, which will be described in detail with reference to FIG. 3 and subsequent figures.

The terminal 10 in this specification is a comprehensive concept of a user terminal in wireless communication and is a concept not only for UE (User Equipment) in WCDMA, LTE and HSPA but also for MS (Mobile Station), GSM ), A subscriber station (SS), a wireless device, and the like.

A base station 20 or a cell is generally a fixed station that communicates with the terminal 10 and includes a Node-B, an evolved Node-B (eNB), a Base Transceiver (BTS) System, an access point, a relay node, and the like

That is, the base station 20 or the cell in this specification should be interpreted in a generic sense to denote a partial area covered by a BSC (Base Station Controller) in a CDMA, a NodeB of a WCDMA, Microcontroller, microcell, picocell, femtocell, and relay node communication range.

Herein, the terminal 10 and the base station 20 are used in a generic sense as the two transmitting and receiving subjects used to implement the technical or technical idea described in the present specification, and are not limited by the term or word specifically referred to.

There are no restrictions on multiple access schemes applied to wireless communication systems. Various multiple access schemes 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- 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.

In an embodiment of the present invention, asynchronous wireless communication that evolves into LTE (Long Term Evolution) and LTE-advanced via GSM, WCDMA, and HSPA, and resource allocation such as CDMA, CDMA- Lt; / RTI > The present invention should not be construed as limited to or limited to a specific wireless communication field and should be construed as including all technical fields to which the idea of the present invention can be applied.

The wireless communication system to which the 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. For example, the downlink may be OFDMA (Orthogonal Frequency Division Multiple Access), the uplink may be a Single Carrier-Frequency Division Multiple Access (SC-FDMA) ) Can be used.

The layers of the radio interface protocol between the UE and the network are divided into the first layer (L1), the second layer (L1), and the second layer (L2) based on the lower three layers of the Open System Interconnection A second layer L2 and a third layer L3. The physical layer belonging to the first layer provides an information transfer service using a physical channel.

2A shows subframes and time slot structures of transmission data that can be applied to embodiments of the present invention.

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

For example, if the subframe consists of two time slots, each time slot may include seven symbols in the time domain and 12 subcarriers or subcarriers in the frequency domain, - The frequency domain may be referred to as a resource block or a resource block (RB), but is not limited thereto.

In the 3GPP LTE system, the transmission time of a frame is divided into a TTI (transmission time interval) of a duration of 1.0 ms. The terms "TTI" and "sub-frame" can be used interchangeably and the frame is 10 ms long and includes 10 TTIs.

2B shows 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, and one TTI includes two time-slots 202, 203 of equal length, each time-slot having a duration of 0.5 ms . The time-slot includes seven long blocks (LB) 211 for the symbols. LB is separated into cyclic prefixes (CP) 212. Taken together, one TTI or subframe may include 14 LB symbols, but the present disclosure is not limited to such a frame, subframe or time-slot structure.

Meanwhile, a demodulation reference signal (DMRS, DM-RS) and a sounding reference signal (SRS) are defined in the uplink in the LTE communication system, which is one of the current wireless communication systems. (RS), and a cell specific reference signal (CRS), a MBSFN reference signal (MBSFN-RS) And 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, a UE transmits an uplink demodulation signal (UL DMRS or UL DM-RS) for each slot in order to grasp channel information for demodulating a data channel in an 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. In case of UL DMRS associated with PUCCH (Physical Uplink Control CHannel) And transmits a reference signal to 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 can be formed for one layer.

3 is a diagram illustrating a process in which a UE generates a DM-RS sequence 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 reference signal (RS) sequence is a cyclic shift (CS)

And base sequence (

). ≪ / RTI > 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 the length n of the sequence. However, the base sequence of the UL DM-RS occupying the same frequency band in the same base station (cell, etc.) and slot time is the same.

를 구하는 과정은 수학식 2와 같다.On the other hand, the value for the cyclic shift (CS)

(2) " (2) "

&Quot; (2) "

,

,그리고,

를 산출해야 한다. To obtain the value of [alpha], n _cs is

,

,And,

.

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

(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 the 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. 상위 레이어에 의해 주어지는 사이클릭 쉬프트 파라메터의 값에 의해 결정된다. 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 latest DCI format 0 as shown in Table 2. < tb >< TABLE > Is determined by the value of the cyclic shift parameter given by the upper layer. As in S330, the UE receives a cyclic shift parameter value of 3 bits determined by scheduling from the upper end, and receives the value of the 3-bit cyclic shift parameter from the base station, (Cyclic Shift) field. The value of the transmitted cyclic shift field is mapped as shown in Table 2

(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 steps S320 to S340,

,

(S350).

To get the value of n _cs .

and

Depends on each base station (cell, etc.) and slot time, but has a fixed value in the same base station (cell, etc.) and slot time, so a parameter that substantially changes the value of n _cs

to be. That is, the parameters that are actually transmitted by the upper layer through the base station by scheduling for each terminal are

, And according to this value, the CS (Cyclic Shift) value a of the UL DM-RS has a different value.

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

(Cyclic shift value, CS), the DM-RS sequence is generated according to Equation (1) (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). In case of the DM-RS associated with the PUSCH, the symbol is allocated to the fourth symbol of the seventh symbol of each slot when a normal CP (Cyclic Prefix) is used, and when the extended CP is used, . In the case of the DM-RS associated with the PUCCH, the corresponding symbol can be a maximum of 3 symbols in each slot, and the number and position of the corresponding symbols are different according to the CP type and the PUCCH format as shown in Table 3. [

[Table 3] Symbol positions in a 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, and the DM-RS signal is transmitted to the BS in step S380.

Meanwhile, the next generation communication technologies such as the LTE-A (Long Term Evolution-Advanced) system currently being discussed support up to four antennas in the uplink, DM-RS sequence mapping is required. For this purpose, orthogonality can be maintained by varying the CS values in the base sequence.

In order to further ensure orthogonality between layers in SU-MIMO and Multiple-User Multiple Input Multiple Output (MU-MIMO), or in order to distinguish a plurality of terminals in MU- A method of adding an OCC (Orthogonal Cover Code) as a unit has been proposed.

The OCC can be configured as shown in Table 4.

[Table 4] Configuration of OCC

On the other hand, when only one layer is used as in the conventional LTE, a CS value determined by scheduling from an upper layer is signaled to a UE (terminal) with a 3-bit value through a base station (eNB or the like) In systems such as LTE-A, CS values and OCCs must be provided so that many layers and terminals can be orthogonal to each other. For example, when a maximum of four layers are used, it is necessary to apply CS and OCC to a maximum of four layers to ensure orthogonality.

Therefore, the base station as it passes the information on the n _occ of 1bit representing the OCC to the UE, the DM-RS sequence mapped by using this value makes it possible to ensure orthogonality among the UE, the layer. On the other hand in such a manner as to pass these n _occ to the UE, it may be considered that the transmission through a direct 1bit signal the UE to n _occ value at the base station. However, in case of 1-bit signaling, in the case of LTE-A using a plurality of component carriers unlike LTE, one bit is added to each component carrier per subframe, An overhead problem may occur. Meanwhile, unlike signaling 3 bits using DCI format 0 in LTE, 4 bits including an additional 1 bit are required, so it may be necessary to configure a DCI format different from LTE. Therefore, it is necessary to allow the UE to use OCC without a separate 1-bit signaling.

On the other hand, in systems such as LTE, there is no need to simultaneously consider the SU-MIMO and MU-MIMO environments. However, in a system such as the LTE-A, a layer is divided in SU-MIMO, a cyclic shift (CS) value optimized simultaneously in the division of a plurality of UEs in MU-MIMO, (Orthogonal Cover Code) allocation. In particular, it is necessary for a user terminal to generate a reference signal by allocating the cyclic delay and the OCC without any additional signaling as described above.

In the present specification, a cyclic shift (CS) value and an OCC (Orthogonal Cover Code) are allocated to each layer of an uplink (UL) demodulation reference signal (DM-RS) And the implementation of the device. In addition, according to whether the connection state of the UE is a SU-MIMO or a MU-MIMO, a cyclic shift (CS) value and an OCC (Orthogonal Cover Code) allocation can be configured differently. In the MU-MIMO, an OCC can be used for distinguishing a layer, and a method and apparatus for allowing OCC to be used for dividing a plurality of UEs are provided. Particularly, in the present specification, if a value of a cyclic shift (CS) of a first layer determined at an upper layer is given to a UE through a base station (eNB or the like) Cyclic Shift (CS) values and the OCC of each layer can be assigned without any additional signaling.

4 is a diagram of an orthogonality assignment rule according to an embodiment of the present invention. The Allocation Rule refers to a rule applied to allocate information related to orthogonality on a layer-by-layer basis. The information related to the orthogonality is information necessary for providing orthogonality. The _ncc indicating the configuration of the OCC or the configuration of the OCC as described above in Table 4 may be an embodiment of information related to orthogonality.

FIG. 4 is a rule related to how information related to orthogonality is set in a layer-by-layer manner. In FIG. 4, n _occ , that is, an OCC index is described as an embodiment. In this case, the OCC index can have two values (0 or 1).

The orthogonality assignment rules are the same and non-identical. The same method means that the same orthogonality-related information is allocated to the remaining layers using orthogonality-related information for a specific layer. In the case of applying the same scheme, the orthogonality is provided for each UE, and may be applied to MU-MIMO in one embodiment. 410, the OCC index (n _occ ) of the first layer is directly allocated to the N layers.

On the other hand, the non-identical method refers to using orthogonality-related information for a specific layer, and allocating orthogonality-related information to some of the remaining layers differently and partly equally. In case of applying the non-uniform scheme, the orthogonality may be provided for each layer, and may be applied to SU-MIMO in one embodiment.

In an embodiment of the non-identical method, there can be a crossing method and a nutritional method. The intersection method means that the first, second,..., N layers intersect with the OCC index (n _occ ) sequentially, such as 420. In the meantime, as in the method 430, the first, second, ..., and N layers are divided into two, and one has an OCC index (n _occ ) same as the first layer and the other has an OCC index (n _occ ). In this manner, the Cyclic Shift (CS) value and the OCC (Orthogonal Cover Code) allocation can be configured differently depending on whether the UE is connected to SU-MIMO or MU-MIMO using the orthogonality allocation rule.

On the other hand, when the information indicating the orthogonality allocation rule is separately signaled, the amount of data to be transmitted and received increases. Therefore, it is necessary to implement an implicit scheme so that the UE can select the orthogonality allocation rule without additional signaling. Hereinafter, a method of providing orthogonality-related information without additional signaling and a method of intrinsically providing orthogonality allocation rules will be described.

First, a process of providing orthogonality-related information to a user terminal without additional signaling at a base station will be described. In this process, the user terminal may be provided with the orthogonality-related information and the orthogonality allocation rule implicitly.

5 is a diagram illustrating a process of setting up and transmitting control information to allow a UE to derive an OCC from a base station according to an embodiment of the present invention.

FIG. 5 shows a process of determining a cyclic shift parameter so that the UE can infer OCC, i.e., the UE can calculate information related to orthogonality, and transmits the cyclic shift parameter to the UE.

The entire process determines a cyclic shift parameter by which a base station determines a multiple access state of one or more UEs and can calculate information related to orthogonality, and transmits the determined cyclic-shift parameter to the UE. This process is described in more detail as follows.

The number of UEs and the number of antennas for each UE are checked (S510). This includes checking whether the UE is configured as SU-MIMO or MU-MIMO. If it is determined in step S520 that the UE is in the SU-MIMO state, the UE determines whether the UE is in the SU-MIMO state in step S522. The confirmation of the status includes a case where the UE can directly confirm whether it is the SU-MIMO, a case where the status information of the network that can infer the SU-MIMO situation, for example, information such as sequence hopping of the reference signal can be confirmed .

가 될 수 있다. If it is confirmed that the UE is SU-MIMO, the process of S530 is performed. This includes a case where the user terminal can confirm the orthogonality allocation rule through the state of the network, and when the user terminal verifies whether the current connection state is SU-MIMO or MU-MIMO directly or through other information . In this case, a cyclic shift parameter to be allocated to the UE among all assignable cyclic-shift parameters is determined (S530). One embodiment of a cyclic shift parameter

.

If it can not be confirmed that the UE is SU-MIMO, the process proceeds to S535. In order to know that the UE is SU-MIMO, a cyclic shift parameter to be allocated in a first cyclic shift parameter group that can be assigned a cyclic shift in case of SU-MIMO may be determined (S535).

If it is MU-MIMO, it is determined whether the UE is in the MU-MIMO state as in S525 (S525). The checking of the status includes the case where the UE can directly confirm whether it is the MU-MIMO, the case where the status information of the network that can infer the MU-MIMO situation, for example, the information such as the hopping of the sequence of the reference signal can be confirmed .

If it is confirmed that the UE is the MU-MIMO, the process of S540 is performed. This includes a case where the user terminal can confirm the orthogonality allocation rule through the state of the network, and when the user terminal verifies whether the current connection state is SU-MIMO or MU-MIMO directly or through other information . In this case, the orthogonality allocation rule can set the orthogonality-related information by checking the information related to the connection state of the user terminal.

In more detail, all possible cyclic shift parameters that can be assigned to the UE can be divided into a first set and a second set, and the intersection of the first set and the second set is empty. That is, the cyclic shift parameter belonging to the first set can not belong to the second set. And the first set together with information about orthogonality by setting the value of the cyclic shift parameter when connected to the first information related to orthogonality and the second set of information associated with the second information related to orthogonality.

The number of the sets according to an embodiment of the present invention is 2 when the information related to the orthogonality is 2. When the information related to the orthogonality is N, the cyclic shift parameters are divided into N sets , So that each intersection can be an empty set. Further, in another embodiment of the present specification, a function may be used instead of the division by a set. That is, a predetermined cyclic shift parameter may be mapped to first information related to orthogonality, and another cyclic shift parameter may be mapped to second information related to orthogonality.

The selected cyclic shift is inserted into the control information (S550). According to an embodiment of the present invention, the PDCCH may be included in the DCI format (Downlink Control Information) 0 of the Physical Data Control Channel (PDCCH).

Then, the control information is transmitted to the UE (S560). The UE receiving the control information can confirm orthogonality related information in the set including the cyclic shift. Further, when confirming or inferring whether the connection state of the user terminal is SU-MIMO or MU-MIMO, the orthogonality allocation rule can be selected, and the OCC can be set for each layer according to the selected orthogonality allocation rule . Of course, the cyclic shift parameter can be set for each layer in the previously received cyclic shift.

In more detail, for a plurality of UEs, a cyclic shift parameter is determined for each UE among a first cyclic shift parameter group and a second cyclic shift parameter group. For the plurality of UEs, all the UEs may receive the cyclic shift parameter determined only in one of the first or second group of cyclic shift parameter groups, The two UEs must receive cyclic shift parameters determined in different cyclic shift parameter groups. At this time, the first information related to the orthogonality calculated in the first cyclic shift parameter group is determined to be different from the second information related to the orthogonality calculated in the second cyclic shift parameter group. This allows the cyclic shift parameter to yield information related to orthogonality, so that the first cyclic shift parameter group and the second cyclic shift parameter group can be determined to yield information related to different orthogonality, e.g., OCC. have. Also, according to an embodiment of the present invention, the orthogonality allocation rule can be determined by the first cyclic shift parameter group and the second cyclic shift parameter group.

Next, if it is not confirmed that the UE is the MU-MIMO, the process of S545 is performed. Since the UE can not confirm whether the current connection state is SU-MIMO or MU-MIMO, the orthogonality allocation rule includes a case where the user terminal can not confirm the orthogonality allocation rule through the state of the network, It can be confirmed by the cyclic shift parameter. Of course, orthogonality related information can also be set as a cyclic shift parameter.

In more detail, all possible cyclic shift parameters that can be assigned to the UE can be divided into a first set and a second set, and the intersection of the first set and the second set is empty. That is, the cyclic shift parameter belonging to the first set can not belong to the second set. And the first set together with information about orthogonality by setting the value of the cyclic shift parameter when connected to the first information related to orthogonality and the second set of information associated with the second information related to orthogonality. In addition, the second set is divided into the 2-1 set and the 2-2 set where the intersection set is an empty set. In the case of MU-MIMO in step S545, the values of the cyclic shift parameters are set in the second-first set and the second-second set for the respective UEs. As a result, when the cyclic shift parameter extracted from the control information received by the user terminal is included in the second-first set or the second-second set, the user terminal can extract the orthogonality-related information as information related to the set, The orthogonality rules for other layers can also be inferred through the 2-1 and 2-2 sets. For example, a UE receiving a cyclic shift parameter included in the 2-1 and 2-2 sets may perform the orthogonality allocation rule for each layer in the same manner as appropriate for MU-MIMO.

In the MU-MIMO according to an embodiment of the present invention, the number of the sets (2-1 set and 2-2 set) is 2 when the information related to orthogonality is 2, and other orthogonality- When the information is N, the cyclic shift parameter is divided into N sets, and each intersection can be an empty set. Further, in another embodiment of the present specification, a function may be used instead of the division by a set. That is, a predetermined cyclic shift parameter may be mapped to first information related to orthogonality, and another cyclic shift parameter may be mapped to second information related to orthogonality.

In FIG. 5, the embodiment may be divided into two or more groups, which will be described below. However, the present invention is not limited to this, and it is characterized in that information related to orthogonality can be transmitted without separately transmitting information and orthogonality allocation rules related to orthogonality.

In the case of S540, in the MU-MIMO environment, the UE group 1 and the UE group 2 become one embodiment of two or more user terminals with non-equal bandwidth resource allocation. In a first UE group and a second UE group, which are groups of user terminals belonging to a corresponding bandwidth group in a group that is divided into two allocated bandwidths having the same bandwidths allocated in the MU-MIMO environment, Each cyclic shift parameter in a first cyclic shift parameter group to be received by one or more UEs in a first UE group and each cyclic shift parameter in a second cyclic shift parameter group to be received by one or more UEs in a second UE group As described above, the first information related to the orthogonality calculated in the first cyclic shift parameter group is determined to be different from the second information related to the orthogonality calculated in the second cyclic shift parameter group.

In the case of S545, the UE group 2-1 and the UE group 2-2 in the MU-MIMO environment are one embodiment of two or more user terminals with non-equal bandwidth resource allocation. In the MU-MIMO environment, in the group divided into two allocated bandwidths having the same bandwidth, the second-1 UE group and the second-UE UE, which are groups of user terminals belonging to the corresponding bandwidth group, Group, the cyclic shift parameter in each of the second-1 cyclic shift parameter group to be received by one or more UEs in the second-first UE group and the second cyclic shift parameter in the second- As described above, the first information related to the orthogonality calculated in the second-first cyclic shift parameter group is the second cyclic shift parameter group in the second-second cyclic shift parameter group Is different from the second information related to the orthogonality that is calculated in step < RTI ID = 0.0 >

을 전송 받도록 스케쥴링(scheduling) 할 수 있다. (MU-MIMO 환경에서, 할당된 대역폭이 서로 동일한(equal bandwidth resource allocation) 두 개의 단말(UE)에 대해서는 반드시 서로 다른 CS-OCC 링키지 그룹의 CS 파라메터 값

을 전송 받도록 스케쥴링 될 필요는 없다)In particular, two UEs (UEs) with non-equal bandwidth resource allocations must always have CS parameter values of different CS-OCC linkage groups

May be scheduled to be received. (In the MU-MIMO environment, the CS parameter values of different CS-OCC linkage groups necessarily have to be equal for two UEs with equal bandwidth resource allocation)

Need not be scheduled to receive < RTI ID = 0.0 >

을 생성한다. 즉, UE는 DCI 포맷 등을 통해 수신한

에서 해당하는 OCC 값을 산출하여 적용한다.

에서 OCC 값을 산출하는 과정은 다양하게 전개될 수 있다. 표 4에서 살펴본 바와 같이 OCC 값으로 0, 1인 경우, UE는

의 값을 2로 나누어 그 나머지 값을 OCC 값으로 취할 수 있다. 또한 다른 실시예로

와 OCC를 미리 링크 짓는 방식을 고려할 수 있다.As shown in FIG. 5, the eNB can estimate the OCC value without setting the OCC value separately.

. That is, the UE transmits the DCI format

And the corresponding OCC value is calculated and applied.

The process of calculating the OCC value can be variously developed. As shown in Table 4, when the OCC value is 0 or 1,

Can be divided by 2 and the remaining value can be taken as the OCC value. In another embodiment

And OCC in advance.

값을 표 5와 같이

값을 4개씩 묶어 2개의 CS-OCC 링키지 그룹(linkage Group)으로 구성할 수 있다. 각각의 그룹 내의 CS 파라메터 값인

는 동일한, 즉 하나의 OCC 인덱스인

로 링크되게 되며, 다른 그룹의 CS 파라메터 값

는 다른 OCC 인덱스인

로 링크된다. 이러한 그룹의 일 실시예는 표 5와 같다. 그러나, CS 파라메터의 값

을 2개의 그룹으로 나누는 방법은 표 5와 같은 구성 및 할당에 한정되지 않는다. 따라서 DM-RS의 균등한 분배와 OCC를 통한 최대한의 직교성(orthogonality)를 보장할 수 있도록 그룹지을 수 있다. 예를 들어, 랭크(Rank) 4의 4개의 레이어에서 적용될 수 있는 4개의 CS 파라메터 값 {0,3,6,9}을 고려할 경우, {0,6}은 OCC 인덱스 값이 0으로, {3,9}는 OCC 인덱스 값이 1이 되도록 균등하게 교차해서 그룹화 할 수도 있다. In one embodiment of the present disclosure, 8 types of CS fields each consisting of 3 bits in DCI format 0 (DCI format 0) in the LTE system, such as that shown in Table 2,

The values are shown in Table 5

The values can be grouped into four to form two CS-OCC linkage groups. The value of the CS parameter in each group

RTI ID = 0.0 > OCC < / RTI > index

, And the CS parameter value of another group

Is a different OCC index

. One embodiment of this group is shown in Table 5. However, the value of the CS parameter

Are not limited to the configurations and the allocations shown in Table 5. < tb >< TABLE > Therefore, it can be grouped to ensure equal distribution of DM-RS and maximum orthogonality through OCC. For example, considering four CS parameter values {0, 3, 6, 9} that can be applied in four layers of Rank 4, {0,6} , 9} can be grouped evenly crossing so that the OCC index value is 1.

으로 0, 6, 4, 또는 10인 경우 UE는 OCC 인덱스가 0이므로 OCC를 [+1, +1]로 하여 할당한다. 반면,

으로 3, 9, 2, 또는 8인 경우 UE는 OCC 인덱스가 1이므로 OCC를 [+1, -1]로 하여 할당한다.In Table 5

0, 6, 4, or 10, the UE allocates OCC as [+1, +1] since the OCC index is 0. On the other hand,

Is 3, 9, 2, or 8, the UE allocates OCC as [+1, -1] since the OCC index is 1.

[Table 5] CS-OCC linkage rule

mod 2)를 eNB와 UE가 공유할 수도 있다. 물론 표 5의 내용을 하나의 함수로 구현할 수도 있다.Table 5 shows a group as an embodiment in which OCC can be deduced from the CS. In addition, information about a function having a CS value as an input value (for example,

mod 2) may be shared by the eNB and the UE. Of course, the contents of Table 5 can be implemented as one function.

When the configuration of Table 5 is applied, a cyclic shift (CS) value is delivered to the UE through a base station (eNB or the like) in a first layer determined by scheduling at an upper end The OCC of each layer can be allocated according to a cyclic shift (CS) value of another layer from the value and a predetermined orthogonality allocation rule.

First, a case where the orthogonality allocation rule is a non-identical method will be described.

) 이 포함된 DCI format 0를 제어 신호에 포함시켜 생성한다. 기지국 등은 스케쥴링(scheduling) 대상인 각 UE가 SU-MIMO로 작용할 것인지, MU-MIMO의 한 UE로 작용할 것인지를 상위단에서 판단하여, 해당 UE가 SU-MIMO로 작용할 경우, 상기 표 5 CS-OCC 링키지 그룹에 상관없이 3bit의의 CS 파라메터 값(DCI format 0)

을 전송하게 된다. 즉 SU-MIMO의 경우, 시스템 상위단에 의해 각 UE별로 결정된 3bit의 CS parameter 값

은 상기 표 5의 CS-OCC 링키지 그룹 A와 CS-OCC 링키지 그룹 B를 포함한 총 8가지의 값 중 하나이며, 이를 각 UE별로 전송하게 된다.The base station (eNB or the like) receives the 3-bit CS parameter value (

) Is included in the control signal. The base station determines at a higher level whether each UE to be scheduled is to function as a SU-MIMO or a MU-MIMO. If the corresponding UE functions as an SU-MIMO, 3-bit CS parameter value (DCI format 0) regardless of linkage group

. That is, in case of SU-MIMO, the 3-bit CS parameter value determined for each UE by the system upper layer

Is one of eight values including the CS-OCC linkage group A and the CS-OCC linkage group B in Table 5, and is transmitted for each UE.

The base station transmits the generated control information. More specifically, the 3-bit value can be transmitted in a cyclic shift (CS) field in DCI format 0.

을 전송하게 된다. 즉 MU-MIMO의 경우, 시스템 상위단에 의해서 각 UE별로 CS 파라메터 값

을 결정하기 위해서 스케쥴링(scheduling) 될 때, 각 UE는 서로 다른 CS-OCC 링키지그룹의 CS 파라메터 값

을 선택하도록 스케쥴링될 수 있다. 특히나 할당된 대역폭이 서로 동일하지 않은(non-equal size bandwidth resource allocation) 두 개의 단말(UE)은 반드시 서로 다른 CS-OCC 링키지그룹의 CS 파라메터값

을 전송 받도록 스케쥴링(scheduling) 되어야 한다. (MU-MIMO 환경에서, 할당된 대역폭이 서로 동일한(equal bandwidth resource allocation) 두 개의 단말(UE)에 대해서는 반드시 서로 다른 CS-OCC linkage Group의 CS parameter 값

을 전송 받도록 스케쥴링 될 필요는 없다) 즉 하나의 UE에 대해서는 CS-OCC 링키지그룹 A의 4가지의 CS 파라메터 값

중 하나를 전송 받도록 스케쥴링 되었다면, 다른 하나의 UE에 대해서는 CS-OCC 링키지그룹 B의 4가지의 CS 파라메터값

중 하나를 전송 받도록 스케쥴링되는 것이다. 예를 들면 UE1은 특정 레이어에 대해서, CS 파라메터값

으로 CS-OCC 링키지그룹 A의 4가지 값 중 하나인 0을 전송 받았다면, UE2는 동일 레이어에 대해서, CS 파라메터 값

으로 CS-OCC 링키지그룹B의 4가지 값 중 하나인 3을 전송 받는 식이다. 이럴 경우, MU-MIMO환경에서 2개의 UE의 경우 반드시 서로 다른 OCC 인덱스를 가지게 되므로, 항상 구별이 가능하게 된다.If the corresponding UEs function as MU-MIMO, the CS parameter value of 3 bits, considering the CS-OCC linkage group of Table 5

. That is, in the case of MU-MIMO, by the system upper layer, the CS parameter value

When scheduling to determine the CS parameter value of each CS-OCC linkage group,

May be scheduled to be selected. In particular, two UEs (UEs) with non-equal-size bandwidth resource allocations must have CS parameter values of different CS-OCC linkage groups

To be transmitted. (In the MU-MIMO environment, for two UEs with equal bandwidth resource allocation, the CS parameter value of the different CS-OCC linkage group

It is not necessary to be scheduled to receive the CS-OCC linkage group A. That is, for one UE, four CS parameter values of the CS-OCC linkage group A

OCC linkage group B, the CS parameter value of the CS-OCC linkage group B

To be transmitted. For example, UE1 may set the CS parameter value

0 ", which is one of the four values of the CS-OCC linkage group A, UE2 transmits a CS parameter value

And the CS-OCC linkage group B, which is one of four values, is transmitted. In this case, since two UEs in the MU-MIMO environment always have different OCC indices, they can always be distinguished.

를 기지국(eNB 등)을 통해 전송 받게 된다. 이 3bit의 값은 DCI format 0에 CS(Cyclic shift) 필드로 실려서 전송될 수 있다. 이 3bit의 CS 파라메터 값

은 상기 설명한 바와 같이 해당 시스템이 SU-MIMO와 MU-MIMO인지에 따라 서로 다른 방식으로 시스템 상위단에 의해서 스케쥴링되어 결정된다. UE(단말)은 이 3bit의 값으로부터

을 앞서 언급한 표 1과 같이 알 수 있으며, 상기 언급한 수학식 1에 의해 UL DM-RS의 CS(Cyclic Shift)값

를 계산하게 된다. 이 때,

를 구성하게 되는 다른 파라메터

,

는 각 기지국(셀 등) 및 슬롯 시간(slot time)에 따라 달라지지만, 동일한 기지국(셀 등) 및 슬롯 시간(slot time)에는 고정된 값을 가지게 되므로, 실질적으로 상위단이 스케쥴링(scheduling)하여 기지국(eNB 등)을 통해 전송하게 되는 파라메터는

이며, 이에 따라 UL DM-RS의 CS(Cyclic Shift)값

가 서로 다른 값을 가지게 된다.Next, the UE (UE) calculates a cyclic shift parameter value of 3 bits, which is determined by scheduling from the upper layer

(ENB or the like). This 3-bit value can be carried in the CS (Cyclic Shift) field in DCI format 0 and transmitted. The 3-bit CS parameter value

Is determined by scheduling by the upper layer system in different ways according to whether the corresponding system is SU-MIMO and MU-MIMO, as described above. The UE (terminal)

(Cyclic Shift) value of the UL DM-RS according to Equation (1) mentioned above,

. At this time,

Lt; RTI ID = 0.0 >

,

(Cells, etc.) and slot time, but has a fixed value in the same base station (cell, etc.) and slot time, so that the upper layer substantially schedules The parameters to be transmitted through the base station (eNB or the like)

And accordingly, the Cyclic Shift (CS) value of the UL DM-RS

Are different from each other.

으로부터 제 1 레이어의 CS

값을 계산하게 된다. 또한, 전송된 CS 파라메터 값

으로부터 미리 정의된 CS-OCC 링키지 룰에 의해 제 1 레이어의 OCC index

도 계산하게 된다. 여기서, 미리 정의된 CS-OCC 링키지 룰의 한 예가 상기 언급한 표 2이다. 예를 들어 전송된

값이 표 2의 CS-OCC 링키지 그룹 A에 해당하는 0, 6, 4, 10일 경우

는 내재적으로(implicit) 0으로 자동 계산되게 된다. 반대로 전송된

값이 표 2의 CS-OCC 링키지 그룹 B에 해당하는 3, 9, 2, 8일 경우

는 내재적으로 1로 자동 계산되게 된다. 이 때,

가 0이면 OCC {+1, +1}을 의미하며

가 1이면 OCC {+1, -1}를 의미하지만, 의미와 내용이 바뀌지 않는 한도 내에서 OCC index를 표현하는 파라메터의 수학적인 표현과 그 값이 한정되지 않는 것은 자명하다.That is, the UE (UE) is determined by scheduling by the upper layer of the system and is configured in the DCI format 0, and the CS parameter value transmitted from the base station (eNB)

Lt; RTI ID = 0.0 > CS &

Value. Also, the transmitted CS parameter value

OCC linkage rule defined in advance from the OCC index of the first layer

. Here, an example of the predefined CS-OCC linkage rule is Table 2 mentioned above. For example,

When the values are 0, 6, 4, and 10 corresponding to the CS-OCC linkage group A in Table 2

Is implicitly zeroed automatically. Conversely,

When the value is 3, 9, 2, or 8 corresponding to the CS-OCC linkage group B in Table 2

Is automatically calculated to be 1 implicitly. At this time,

0 means OCC {+1, +1}.

1 means OCC {+1, -1} but it is obvious that the mathematical expression and the value of the parameter expressing the OCC index are not limited unless the meaning and contents are changed.

로부터 해당 레이어의 CS 값

를, 상기 제 1 레이어의 OCC index

로부터 해당 레이어의 OCC 인덱스를 계산하게 된다.Next, the UE checks whether there is a layer to be additionally allocated or used in addition to the first layer. If there is an additional layer, the UE sets the CS parameter value of the first layer

The CS value of the corresponding layer

, The OCC index of the first layer

The OCC index of the layer is calculated.

로부터 해당 레이어의 CS 값

을 계산하게 되는 CS 할당 룰(CS Allocation Rule, CS 할당 방법)은 총 레이어 개수를 고려하고, 각 레이어에 할당되는 CS 값들이 가능한 한 서로 최대의 거리를 가지도록 정해지는 것이 레이어간 간섭을 줄일 수 가장 적절한 방법이다. 아래 수학식 3은 각 레이어 개수에 따라, 각 레이어에 할당되는 CS 값들이 가능한 한 서로 최대의 거리를 가지도록 하는 CS 할당 룰의 한 예이다.Here, the CS parameter value of the first layer

The CS value of the corresponding layer

The CS allocation rule (CS allocation method), which considers the total number of layers, is determined such that the CS values allocated to the respective layers have a maximum distance from each other as much as possible, It is the most appropriate method. Equation (3) is an example of a CS allocation rule that, according to the number of layers, CS values allocated to respective layers have maximum distances from each other as much as possible.

Equation (3) shows an embodiment of the CS allocation rule.

&Quot; (3) "

The first layer of Equation (3) denotes the first layer. The second, third, ... layers all refer to the second, third, etc. layers. The rank means the number of layers.

Equation (3) sets the CS values of the first and second layers at an interval of 6 (180 degrees) so as to be maximally spaced within 360 degrees of rank 2 (i.e., when there are two layers). In the case of Rank 3, the CS value is set to be an interval of 6, 3, 12 so as to be spaced apart by a maximum of 360 in the interval of 4 (120 degrees), and in the case of the rank 4, within 360 degrees.

Accordingly, when the CS value of the first layer is set, the other layer is allocated to have the maximum distance according to the rank number with respect to the CS value, as compared with the first layer.

또는 첫번째 레이어의 OCC에서 2~N번째 레이어의 OCC 인덱스를 계산한다. 앞서 살펴본 바와 같이 표 5 등의 방식으로

를 통해 첫번째 레이어의 OCC를 산출하였다. 그리고 OCC 역시 직교성을 가지도록 할당될 수 있다. 제 1 레이어의 OCC(즉,

를 통해 산출된 값)에서 제 2, 3, ... 레이어의 OCC를 할당하여 산출할 수 있다. 이를 위해 OCC 할당 방식(OCC allocation rule)은 총 레이어의 개수를 고려하여, 각 레이어에 할당되는 OCC 값들이 가능한 기 설정된 CS 값들과 연게될 경우, 최대한의 직교성(orthogonally)를 가지도록 하여 레이어간 간섭을 최대한 줄이도록 한다. 아래 수학식 4는 수학식 3과 같이 최대의 직교성을 보장하기 위하여 제 1, 2, 3, 4 레이어에 대하여

가 값이 바뀌도록 설정할 수 있다. After the UE calculates the CS value for each layer,

Or calculate the OCC index of the 2 nd to N th layers in the OCC of the first layer. As we have seen,

The OCC of the first layer was calculated. The OCC can also be assigned to have orthogonality. The OCC of the first layer (i.e.,

The OCCs of the second, third,... Layer can be calculated. For this, the OCC allocation rule takes into account the total number of layers, and when the OCC values assigned to the respective layers are linked with the preset CS values, maximum orthogonality is achieved, As much as possible. The following Equation (4) is applied to the first, second, third and fourth layers in order to ensure maximum orthogonality as shown in Equation (3)

Can be set to change the value.

로부터 해당 레이어의 OCC 인덱스를 계산하게 되는 OCC 할당 방법은 총 레이어의 개수를 고려하고, 각 레이어에 할당되는 OCC 값들이 가능한 기 설정된 CS 값들과 연계될 경우 최대한의 직교성(orthogonality)을 가지도록 하는 것이 레이어간 간섭을 줄일 수 가장 적절한 방법이다. 이를 위해서는 레이어(layer) 구분만을 위해서는 각 레이어(layer)의 OCC index값은 서로 교차하도록 하는 것이 최고의 직교성(orthogonality)을 보장 할 것이다. 즉 첫번째 레이어(layer)의 OCC 인덱스값이 0이면, 두번째 레이어(layer)의 OCC 인덱스값은 1, 세번째 레이어(layer)의 OCC 인덱스값은 0, 네번째 레이어(layer)의 OCC 인덱스값은 1로 하는 것이 그 예이다. 하지만 MU-MIMO에서 두 단말(UE)간의 구분을 위해서는 각각의 UE는 각 레이어(layer)에서 동일한 OCC 인덱스를 가져야 한다. 즉 MU-MIMO 환경에서 UE1이 OCC 인덱스를 0으로 가졌고, UE2가 OCC 인덱스를 1로 가졌다면, UE1은 모든 레이어(layer)에 대해서 OCC 인덱스값을 0으로 가져야 하며, UE2는 모든 레이어(layer)에 대해서 OCC 인덱스값을 1로 가져야 한다. 이러한 SU-MIMO에서의 각 레이어(layer)의 구분, MU-MIMO에서 복수개의 단말(UE)의 구분에 있어서 동시에 최적화된 OCC(Orthogonal Cover Code) 할당을 만족하기 위하여서는 도 4에서 살펴본 양분 방식의 OCC 할당 방법을 생각할 수 있다. 여기서 OCC는 Rank2에서는 그 효과가 미비하므로 첫번째 및 두번째 레이어에서는 동일한 인덱스 값을 가지게 할당하며, 세번째 및 네번째 레이어에서는 다른 값을 가지도록 할당한다. 아래 수학식 4은 각 레이어 개수에 따라, 각 레이어에 할당되는 OCC 인덱스가 수학식 3으로 정의된 CS 할당 방법과 연계 시 가능한 한 최대의 직교성을 가지며, 위에서 언급한 SU-MIMO에서의 각 레이어(layer)의 구분, MU-MIMO에서 복수개의 단말(UE)의 구분에 있어서 동시에 최적화된 OCC(Orthogonal Cover Code) 할당을 만족하도록 하는 OCC 할당 룰의 한 예이다.The OCC index of the first layer

The OCC allocation method of calculating the OCC index of the layer from the OCC allocation method considers the total number of layers and makes the OCC values allocated to each layer have maximum orthogonality when associated with the preset CS values as possible This is the most appropriate way to reduce inter-layer interference. In order to achieve this, it is necessary to ensure that the OCC index values of the respective layers cross each other only for the layer discrimination, thereby ensuring the best orthogonality. That is, if the OCC index value of the first layer is 0, the OCC index value of the second layer is 1, the OCC index value of the third layer is 0, and the OCC index value of the fourth layer is 1 For example. However, in order to distinguish between the UEs in the MU-MIMO, each UE must have the same OCC index at each layer. That is, if the UE 1 has the OCC index of 0 in the MU-MIMO environment and the UE 2 has the OCC index of 1, the UE 1 must set the OCC index value to 0 for all the layers, The OCC index value should be 1. In order to satisfy the division of each layer in the SU-MIMO and the allocation of the OCC (Orthogonal Cover Code) optimized at the same time in the division of a plurality of UEs in the MU-MIMO, OCC assignment method can be considered. Here, OCC is assigned to have the same index value in the first and second layers, and different values in the third and fourth layers, since Rank 2 has no effect. The following Equation (4) shows that the OCC index assigned to each layer has the maximum orthogonality in connection with the CS allocation method defined by Equation (3) according to the number of layers, and each layer layer, and an OCC allocation rule that satisfies an OCC (Orthogonal Cover Code) allocation optimized at the same time in the division of a plurality of UEs in the MU-MIMO.

&Quot; (4) "

이다. 표 3의 케이스 5의 UE A, B는 같은 대역폭을 공유하며(equal bandwidth resource allocation), UE C는 UE A, B와 서로 다른 대역폭을 가진다 (non-equal bandwidth resource allocation). 이 경우 UE A와 B는 하나의 CS-OCC 링키지 그룹내의 CS 파라메터 값을 제 1 레이어의 CS 파라메터 값으로 전송 받게 되며, 이를 통해 동일한 OCC 인덱스에 사이클릭 쉬프트 값으로 구분된다. UE C는 UE A와 B와는 다른 CS-OCC 링키지 그룹 내의 CS 파라메터 값을 제 1 레이어의 CS 파라메터 값으로 전송 받게 되며, 이를 통해 UE A와 B와는 서로 다른 OCC 인덱스로 구분되게 된다. Table 6 is an example of the CS parameter value and the OCC index in each layer allocated and configured according to Equations (3) and (4). In Table 6, only the values for scheduling and signaling at the upper end in the case are the CS parameter values of the first layer

to be. UEs A and B in Case 5 of Table 3 share the same bandwidth (equal bandwidth resource allocation), and UE C has a different bandwidth than UE A, B (non-equal bandwidth resource allocation). In this case, the UEs A and B receive the CS parameter value in one CS-OCC linkage group as the CS parameter value of the first layer, and are divided into cyclic shift values in the same OCC index. The UE C receives the CS parameter value in the CS-OCC linkage group different from UE A and B as the CS parameter value of the first layer, and UE A and B are divided into different OCC indices.

That is, the number of UEs in the MU-MIMO environment may be two or more, as in the case of Case 5 in Table 6, but in order to apply the OCC, non-equal bandwidth resource allocation ) UEs must be two groups, and the UEs in this group are scheduled to transmit the CS parameter values in the same CS-OCC linkage group with the CS parameter values of the first layer and transmit them. However, The CS parameter values in the different CS-OCC linkage groups should be transmitted by scheduling with the CS parameter values of the first layer.

[Table 6]

에 수학식 1을 적용하여 각 레이어의 DM-RS 시퀀스를 생성하고, 각 레이어별로 정해진 OCC 인덱스에서의 시퀀스 값(+1 또는 -1)을 곱하여 최종 UL DM-RS 시퀀스를 생성하게 된다. 즉 OCC가 {+1,+1}일 경우 첫 번째 심볼(혹은 슬롯 당 심볼이 하나일 경우 하나의 서브프레임의 첫 번째 슬롯)의 DM-RS 시퀀스는 수학식 1의 값을 그대로 적용, 두 번째 심볼(혹은 슬롯 당 심볼이 하나일 경우 하나의 서브프레임의 두 번째 슬롯)의 DM-RS 시퀀스도 수학식 1의 값을 그대로 적용한다. OCC가 {+1, -1}일 경우에는, 첫 번째 심볼(혹은 슬롯 당 심볼이 하나일 경우 하나의 서브프레임의 첫 번째 슬롯)의 DM-RS 시퀀스는 수학식 1의 값을 그대로 적용하지만, 두 번째 심볼(혹은 슬롯 당 심볼이 하나일 경우 하나의 서브프레임의 두 번째 슬롯)의 DM-RS 시퀀스는 수학식 1의 값에 -1을 곱하여 적용한다.When the CS and OCC calculations for the allocated layers are completed, the UE generates a base sequence and a cyclic shift (CS) value for each layer,

The DM-RS sequence of each layer is generated by applying Equation (1), and the final UL DM-RS sequence is generated by multiplying the sequence value (+1 or -1) in the OCC index determined for each layer. That is, when the OCC is {+ 1, + 1}, the DM-RS sequence of the first symbol (or the first slot of one subframe when there is one symbol per slot) The DM-RS sequence of the symbol (or the second slot of one subframe when there is one symbol per slot) also applies the value of Equation 1 as it is. If the OCC is {+1, -1}, the DM-RS sequence of the first symbol (or the first slot of one subframe when there is one symbol per slot) applies the value of Equation 1 as it is, The DM-RS sequence of the second symbol (or the second slot of one subframe when there is one symbol per slot) is applied by multiplying the value of Equation 1 by -1.

In order to satisfy the above-mentioned discrimination of each layer in SU-MIMO, allocation of CS (Cyclic Shift) and OCC (Orthogonal Cover Code) simultaneously optimized in the division of UEs in MU-MIMO The CS and OCC assignment rules support up to four Rank per UE in SU-MIMO, but up to two RUs per UE in MU-MIMO. If MU-MIMO supports up to 4 ranks per UE, the different CS and OCC allocation rules in SU-MIMO and MU-MIMO need to distinguish each layer in SU-MIMO and MU- CS (Cyclic Shift) and OCC (Orthogonal Cover Code) allocation can be simultaneously optimized in the division of a plurality of UEs. That is, for SU-MIMO and the like, the OCC index values of the respective layers should be orthogonal to each other in order to distinguish the layers. That is, if the OCC index value of the first layer is 0, the OCC index value of the second layer is 1, the OCC index value of the third layer is 0, and the OCC index value of the fourth layer is 1 For example. In order to distinguish between the UEs in the MU-MIMO, each UE must have the same OCC index at each layer. That is, if the UE 1 has the OCC index of 0 in the MU-MIMO environment and the UE 2 has the OCC index of 1, the UE 1 must set the OCC index value to 0 for all the layers, The OCC index value should be 1.

In order to satisfy the division of each layer in SU-MIMO and the allocation of OCC (Orthogonal Cover Code) optimized at the same time in the division of a plurality of UEs in MU-MIMO, not only SU-MIMO In MU-MIMO, the CS and OCC allocation rules in SU-MIMO and MU-MIMO must be different in order to support up to four rank per UE. To do so, a non-transparent system is required to provide additional 1-bit signaling for SU-MIMO and MU-MIMO, or to know whether the UE is SU-MIMO or MU-MIMO. In this specification, a general system in which the UE does not know whether it is SU-MIMO or MU-MIMO has implicitly implied SU-MIMO and CS and OCC assignment rules in MU-MIMO to be different from each other without any additional signaling . The eNB of FIG. 5 confirms whether the UE can know whether it is MU-MIMO in S525. If the UE is a non-transparent system, the process proceeds to S540 of FIG. Similarly, if it is determined that the UE is not aware of itself, but is informed by the network that it is SU-MIMO or MU-MIMO, for example, it can be determined through a sequence or a sequence group hopping, You can proceed. In the case where the UE can not know itself, and it is possible to confirm whether it is SU-MIMO or MU-MIMO through the CS-OCC linkage rule, this linkage rule can be applied.

The base station may also be designed only for S540 (including S530) of FIG. 5, and conversely only for S545 (including S535). That is, each base station may operate and operate solely in consideration of steps S530 and S540 which are performed when it is possible to confirm whether the UE is directly or indirectly SU-MIMO or MU-MIMO without a determination process of S522 and S525 of FIG. (S535 and S545) that are performed when the UE can not directly or indirectly determine whether it is SU-MIMO or MU-MIMO. In other words, FIG. 5 is configured to include two processes including a judgment process. If a process is selected according to a situation, the two processes are separated without a judgment process. .

FIG. 6 is a diagram illustrating a process in which a UE inferences OCC and orthogonality allocation rules from control information transmitted from a base station according to an embodiment of the present invention. Referring to FIG.

6 shows a process of deriving a reference signal based on the OCC derived from the control information received by the UE.

The entire process is performed such that a user terminal using one or more layers receives a cyclic shift parameter for a first layer from a base station and transmits information related to orthogonality to a first layer from a cyclic shift parameter for the received first layer And if there is a layer to be additionally allocated, a cyclic shift parameter for the further allocated layer is calculated in the cyclic shift parameter for the first layer, and the orthogonality allocation rule is selected. The information about the orthogonality of the first layer and information related to the orthogonality of the layer to which the layer is further allocated is calculated using the information related to the orthogonality of the first layer and the orthogonality allocation rule, A reference signal for the first layer is generated using information related to the orthogonality of the layer, and information related to the orthogonality of the further allocated layer and the cyclic shift parameter for the further allocated layer is used Generating a reference signal for the further allocated layer, and transmitting the generated reference signal to the base station.

The details will be described below. Control information is received from the base station (S610). One embodiment of the control information may be information transmitted on the PDCCH. The cyclic-shift parameter for the first layer is calculated in the control information (S620). In the case of the PDCCH, the cyclic shift parameter for the first layer may be included in the DCI format 0. In operation S630, information related to the orthogonality of the first layer is calculated in the cyclic shift parameter for the first layer. An example of information related to the orthogonality of the first layer may be indication information for the OCC. From the cyclic shift parameter for the first layer, information related to orthogonality with respect to the first layer through a group including a predetermined function or a cyclic shift parameter for the first layer. That is, the cyclic shift parameter for the first layer belongs to a specific cyclic shift parameter group, and the information related to the orthogonality for the first layer is the cyclic shift parameter for the first layer, And information related to orthogonality such as OCC associated with the group.

Information related to the cyclic shift parameter for the first layer and the orthogonality to the first layer is used to generate a reference signal for the first layer.

Then, the orthogonality allocation rule necessary for allocating or calculating orthogonality-related information to the layers is selected (S635). As described above with reference to FIG. 4, it is a rule on how to assign orthogonality-related information to other layers using orthogonality-related information for the first layer. The same method and the same method as described above can be included. Further, in selecting the orthogonality allocation rule, a step may be added in which the UE confirms the current connection state or affirms by analogy through sequence hopping, sequence group hopping, and the like. Alternatively, it is possible to select which orthogonality assignment rule is to be applied through the cyclic shift parameter for the first layer in a different manner. A method of selecting such an orthogonality assignment rule will be described later.

It is determined whether a layer to be allocated is present (S640). If there is a layer to be further allocated, the cyclic shift parameter for the further allocated layer is calculated from the cyclic shift parameter for the first layer (S650). Similarly, information related to the orthogonality of the layer is calculated using information related to the orthogonality of the first layer and the selected orthogonality allocation rule (S660).

If there is no more layer to be allocated, the reference signal is generated for each of the first to N-th layers (S670). Then, the generated reference signal is transmitted to the base station (S680). One embodiment of the reference signal may be a DM-RS.

The information related to the orthogonality may be information indicating an orthogonality cover code.

A more detailed embodiment will be described as follows.

In FIGS. 7 and 8, a process of selecting an orthogonality allocation rule using sequence hopping information according to an embodiment of the present invention, allocating OCC values for each layer, assigning a CS value for each layer, and generating and transmitting a reference signal Fig.

The selection of the orthogonality allocation rule applied to FIGS. 7 and 8 is a method of changing the CS and OCC allocation rules according to a sequence or sequence group hopping (hereinafter referred to as hopping) scheme. That is, it is determined whether the DM-RS sequence will function as SU-MIMO according to the hopping scheme or MU-MIMO with the equal sized resource allocation scheme and the case where the MU with non-equal sized resource allocation scheme -MIMO. ≪ / RTI > For example, when the hopping scheme for the demodulation reference signal (DM-RS) sequence is enabled in the LTE Rel-8 system, that is, in the case of slot-based hopping, CS And OCC allocation rules. This is the case when the multiple access state operates with SU-MIMO (or MU-MIMO with equal sized resource allocation). If the hopping scheme for the DM-RS sequence is disabled in the LTE Rel-8 system or is not slot-wise hopping in existing LTE Rel-8 systems such as subframe-by-subframe hopping CS and OCC allocation rules in Equation (6) to be described later are applied. This corresponds to a case in which the multiple access state operates as an MU-MIMO (in particular, a non-equal sized resource allocation MU-MIMO). The details will be described below.

7 is a diagram illustrating a process in which a UE selects an orthogonality allocation rule and calculates an OCC according to control information transmitted from a base station in an embodiment of the present invention.

)와 CS값을 구하는데 필요한 사이클릭 쉬프트 파라메터의 값으로 표 1과 같이 상위 레이어에 의해 주어지는

와 수학식 2와 같이

를 산출한다(S710). 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. 그 결과, 실질적으로 상위단이 스케쥴링(scheduling)하여 기지국(eNB 등)을 통해 전송하게 되는 파라메터는

이며, 이 값에 의해 따라 UL DM-RS의 CS(Cyclic Shift)값이 서로 다른 값을 가지게 된다.The UE 701 may generate a base sequence based on a zadoff-chu sequence for the UL DM-RS sequence (

) And the value of the cyclic shift parameter required to obtain the CS value, as shown in Table 1

And Equation 2

(S710). The base sequence is generated differently by the group number u, the base sequence number v in the group, and the length n of the sequence. However, the base sequence of the UL DM-RS occupying the same frequency band in the same base station (cell, etc.) and slot time is the same. As a result, the parameters that are actually transmitted through the base station (eNB or the like) by scheduling by the upper layer are

And according to this value, the CS (Cyclic Shift) value of the UL DM-RS has a different value.

S710 may proceed after the various steps of FIG. 7, reflecting the configuration of the system or multiple connection states, and may proceed in conjunction with the various steps of FIG.

)이 포함된 DCI format 0를 제어 신호에 포함시켜 생성한다(S715). S715에서 기지국 등은 스케쥴링(scheduling) 대상인 각 UE가 SU-MIMO(또는 균등 리소스 할당 방식의 MU-MIMO 포함)로 작용할 것인지, MU-MIMO(보다 상세히 비균등 리소스 할당 방식의 MU-MIMO 포함)의 한 UE로 작용할 것인지를 상위단에서 판단하여, 해당 UE가 SU-MIMO(또는 균등 리소스 할당 방식의 MU-MIMO 포함)로 작용할 경우, 상기 표 5 CS-OCC 링키지 그룹에 상관없이 3bit의의 CS 파라메터 값(DCI format 0)

을 전송하게 된다. 즉 SU-MIMO의 경우, 시스템 상위단에 의해 각 UE별로 결정된 3bit의 CS parameter 값

은 상기 표 5의 CS-OCC 링키지 그룹 A와 CS-OCC 링키지 그룹 B를 포함한 총 8가지의 값 중 하나이며, 이를 각 UE별로 전송하게 된다.On the other hand, the base station (eNB, etc.) determines the 3-bit CS parameter value (

) Is included in the control signal (S715). In step S715, the BS determines whether each UE to be scheduled is to function as SU-MIMO (or MU-MIMO in the uniform resource allocation scheme) or MU-MIMO (including MU-MIMO in the non-uniform resource allocation scheme) The UE determines whether the UE will act as a UE, and if the corresponding UE functions as SU-MIMO (or MU-MIMO in the uniform resource allocation scheme), the 3-bit CS parameter value (DCI format 0)

. That is, in case of SU-MIMO, the 3-bit CS parameter value determined for each UE by the system upper layer

Is one of eight values including the CS-OCC linkage group A and the CS-OCC linkage group B in Table 5, and is transmitted for each UE.

The base station transmits the generated control information (S720). More specifically, the 3-bit value can be transmitted in a cyclic shift (CS) field in DCI format 0.

를 산출한다(S725). The UE obtains the 3-bit CS parameter value

(S725).

에서 nCS및 α를 계산하고, 표 5에서

값에 의해

를 산출하여, OCC를 계산할 수 있다(S730). 예를 들어

값이 0인 경우, 표 5에 의하여

는 0이 되며, 그 결과 OCC는 [+1, +1]이 될 수 있다. 예를 들어 전송된

값이 표 5의 CS-OCC 링키지 그룹 A에 해당하는 0, 6, 4, 10 중 하나일 경우

는 별도의 정보 수신 없이도 표 5에 의해 0으로 자동 계산되게 된다. 반대로 전송된

값이 표 5의 CS-OCC 링키지 그룹 B에 해당하는 3, 9, 2, 8 중 하나일 경우

는 별도의 정보 수신 없이 1로 자동 계산되게 된다. 이 때, 표 5에서는

가 0이면 OCC {+1, +1}을 의미하며

가 1이면 OCC {+1, -1}를 의미하지만, 의미와 내용이 바뀌지 않는 한도 내에서 OCC 인덱스를 표현하는 파라메터의 수학적인 표현과 그 값이 한정되지 않는다.Then, the CS value and the OCC value of the first layer are calculated,

Lt; / RTI > and < RTI ID = 0.0 >

By value

And the OCC can be calculated (S730). E.g

If the value is 0, according to Table 5

Becomes 0, so that the OCC can be [+1, +1]. For example,

If the value is one of 0, 6, 4, or 10 corresponding to the CS-OCC linkage group A in Table 5

Is automatically calculated as 0 by Table 5 without receiving any additional information. Conversely,

If the value is one of 3, 9, 2, or 8 corresponding to CS-OCC linkage group B in Table 5

Is automatically calculated as 1 without receiving any additional information. At this time, in Table 5

0 means OCC {+1, +1}.

1 means OCC {+1, -1}, but the mathematical expression and the value of the parameter representing the OCC index are not limited unless the meaning and contents are changed.

에서 추가 할당할 레이어, 즉 2~N번째 레이어의 CS 값을 계산한다(S735). If the CS and OCC values for the first layer are set, check if there are additional layers to allocate, and if there are additional layers to allocate,

The CS value of the layer to be further allocated, i.e., the 2 < th > -th layer is calculated (S735).

로부터 해당 레이어의 CS 값

를 계산하는 규칙(CS 할당 방법, CS allocation rule)을 적용할 수 있는데, 이 규칙은, 각 레이어에 할당되는 CS 값들이 가능한 한 서로 최대의 거리를 가지도록 정해지는 것이 레이어간 간섭을 줄이도록 CS 값을 설정하는 것이다. 각 레이어의 개수에 따라 각 레이어에 할당되는 CS 값들이 가능한 서로 최대의 거리를 가지도록 하는 CS 할당 룰의 일 실시예로 앞서 수학식 3을 참고할 수 있다. 수학식 3은 CS 할당 룰의 일 실시예로서 대표적인 두 가지의 경우를 명시하고 있다. 하지만 CS 할당 룰은 각 레이어에서 직교성을 최대한 보장할 수 있는 한도 내에서 상기 수학식 3의 두 가지 경우에 한정되는 것이 아니라 여러 가지 경우로 구성할 수 있을 것이다.Here, the CS parameter value of the first layer

The CS value of the corresponding layer

(CS allocation method) which can be applied to calculate the CS value assigned to each layer as much as possible so as to minimize the inter-layer interference (CS) Value. Equation (3) can be referred to as an embodiment of the CS allocation rule that allows the CS values allocated to each layer to have a maximum distance from each other as much as possible according to the number of layers. Equation (3) specifies two representative cases as an embodiment of the CS allocation rule. However, the CS allocation rule is not limited to the two cases of Equation (3), but may be configured in various ways as long as orthogonality can be maximally ensured in each layer.

When the CS allocation is completed, it is necessary to select the orthogonality allocation rule. Accordingly, the UE determines what the sequence hopping scheme is (S736). As a result, it can be inferred that the sequence hopping scheme is SU-MIMO in the case of enable or slot-based hopping, or MU-MIMO in the uniform resource allocation scheme. In this case, since the OCC can be allocated to distinguish the layers of the UE, the OCC value can be calculated for the remaining layers by selecting the orthogonality allocation rule in a non-identical manner, that is, in an intersecting or a nodal manner (S737). This can be seen from the equation (5).

On the other hand, when the sequence hopping is disable or the sub-frame hopping, it can be inferred that the MU-MIMO is MU-MIMO of the unequal resource allocation scheme in more detail. In this case, since the OCC can be allocated to distinguish UEs from each other, an orthogonality allocation rule can be selected for the layer in the same manner and the OCC value equal to the OCC of the first layer can be calculated for the remaining layers (S739). This can be seen from Equation (6).

Equation (5) shows the CS allocation and the CS / OCC value for each layer according to the orthogonality allocation rule of the frequency hopping in the slot unit (or when the hopping of the sequence is activated). The orthogonality assignment rule in Equation (5) is a non-uniform manner, and also suggests a crossing method.

&Quot; (5) "

Equation (6) shows the CS allocation and the CS / OCC value per layer according to the orthogonality allocation rule of the subframe-based frequency hopping (or when the hopping of the sequence is inactivated). In Equation (6), there are two user terminals (UE A and UE B), and CS parameter values of the first layer to be allocated to the user terminals are different from each other. As a result, the two user terminals have different OCC values, and this OCC applies equally to all layers in the UE. As a result, the OCC values included in all layers of UE A are all the same, and the OCC values included in all layers of UE B are also the same. However, since the OCC values of UE A and UE B are different from each other, The orthogonality of the reference signal of the UE B can be more clearly ensured.

&Quot; (6) "

에 앞서 살펴본 수학식들을 적용하여 각 레이어의 DM-RS 시퀀스를 생성하고, 각 레이어별로 정해진 OCC 인덱스에서의 시퀀스 값(+1 또는 -1)을 곱하여 최종 UL DM-RS 시퀀스를 생성한다(S745). 예를 들어, 수학식 5가 적용되는 경우 OCC가 {+1,+1}일 경우 첫 번째 심볼(혹은 슬롯 당 심볼이 하나일 경우 하나의 서브프레임의 첫 번째 슬롯)의 DM-RS 시퀀스는 수학식 5의 값을 그대로 적용, 두 번째 심볼(혹은 슬롯 당 심볼이 하나일 경우 하나의 서브프레임의 두 번째 슬롯)의 DM-RS 시퀀스도 수학식 5의 값을 그대로 적용한다. OCC가 {+1, -1}일 경우에는, 첫 번째 심볼(혹은 슬롯 당 심볼이 하나일 경우 하나의 서브프레임의 첫 번째 슬롯)의 DM-RS 시퀀스는 수학식 5의 값을 그대로 적용하지만, 두 번째 심볼(혹은 슬롯 당 심볼이 하나일 경우 하나의 서브프레임의 두 번째 슬롯)의 DM-RS 시퀀스는 수학식 5의 값에 -1을 곱하여 적용한다.When the calculation of CS and OCC is completed for the assigned layers, a base sequence and a CS (Cyclic Shift) value determined for each layer

The DM-RS sequence of each layer is generated by applying the above-described equations, and the final UL DM-RS sequence is generated by multiplying the sequence value (+1 or -1) in the OCC index determined for each layer (S745) . For example, when Equation (5) is applied, the DM-RS sequence of the first symbol (or the first slot of one subframe when there is one symbol per slot) when OCC is {+ 1, + 1} The value of Equation 5 is applied as it is, and the DM-RS sequence of the second symbol (or the second slot of one subframe when there is one symbol per slot) is also applied to the value of Equation (5). If the OCC is {+1, -1}, the DM-RS sequence of the first symbol (or the first slot of one subframe when there is one symbol per slot) applies the value of Equation (5) The DM-RS sequence of the second symbol (or the second slot of one subframe when there is one symbol per slot) is applied by multiplying the value of Equation 5 by -1.

The generated DM-RS sequence is mapped to a corresponding symbol of each slot, which is mapped through a resource element mapper (S750). As described above, the mapped symbols of the DM-RS associated with the PUSCH are allocated to the fourth symbol of the seventh symbol of each slot when a normal CP (Cyclic Prefix) is used, and when the extended CP is used, And corresponds to the third symbol among the symbols of the slot. In the case of the DM-RS associated with the PUCCH, the corresponding symbol can be a maximum of 3 symbols in each slot. The number and position of the corresponding symbols are different according to the type of the CP and the format of the PUCCH as shown in Table 3 above. Upon completion of the mapping, an SC-FDMA symbol is generated from a resource element (RE) to which the DM-RS sequence is mapped through an SC FDMA generator (S755), and the DM-RS signal is transmitted to the base station S760).

When the hopping scheme for the DM-RS sequence is enabled in the LTE Rel-8 system, that is, in the case of slot-based hopping, the OCC in each layer is different in order to distinguish each layer as much as possible The OCC index value is assigned. That is, as shown in Equation (5), the OCC index values in each layer are allocated to be crossed with each other. That is, if the OCC index value of the first layer is 0, the OCC index value of the second layer is 1, the OCC index value of the third layer is 0, and the OCC index value of the fourth layer is 1 For example. At this time, the CS value for the first layer, which is scheduled to be signaled by the upper layer, becomes one of the eight CS values in Table 2. [ In Equation (5), the orthogonality allocation rule is an asynchronous one among the asynchronous methods, and it can be changed into the asynchronous mode and the binary mode as shown in Equation (7). In this case, the OCC value is the same for the first two layers, and is different for the remaining two layers and divided into two.

&Quot; (7) "

을 스케쥴링하여 전송하게 된다. 즉 MU-MIMO의 경우, 시스템 상위단에 의해서 각 UE별로 CS 파라메터 값

을 결정하기 위해서 스케쥴링(scheduling) 될 때, 각 UE는 서로 다른 CS-OCC 링키지 그룹의 CS 파라메터값

을 선택하도록 스케쥴링될 수 있다. 특히나 할당된 대역폭이 서로 동일하지 않은(non-equal size bandwidth resource allocation) 두 개의 단말(UE)은 반드시 서로 다른 CS-OCC linkage Group의 CS parameter 값

을 전송 받도록 스케쥴링(scheduling) 되어야 한다. (MU-MIMO 환경에서, 할당된 대역폭이 서로 동일한(equal bandwidth resource allocation) 두 개의 단말(UE)에 대해서는 반드시 서로 다른 CS-OCC 링키지 그룹의 CS 파리메터값

을 전송 받도록 스케쥴링 될 필요는 없다) 즉 하나의 UE에 대해서는 표 2의 CS-OCC 링키지 그룹 A의 4가지의 CS 파라메터 값

중 하나를 전송 받도록 스케쥴링 되었다면, 다른 하나의 UE에 대해서는 표 2의 CS-OCC 링키지 그룹 B의 4가지의 CS 파라메터 값

중 하나를 전송 받도록 스케쥴링되는 것이다. 예를 들면 UE1은 첫번째 layer에 대해서, CS 파라메터 값

으로 표 2의 CS-OCC 링키지 그룹 A의 4가지 값 중 하나인 0을 전송 받았다면, UE2는 동일 레이어에 대해서, CS 파라메터 값

으로 표 2의 CS-OCC 링키지 그룹 B의 4가지 값 중 하나인 3을 전송 받는 식이다. 이 경우, MU-MIMO환경에서 2개의 UE의 경우 반드시 서로 다른 OCC 인덱스를 가지게 되므로, 항상 구별이 가능하게 된다. 상기 수학식 6은 수학식 5와 연계되는데, 상기 수학식 7과 연계하여 아래 수학식 8 역시 MU-MIMO에 적용할 수 있다.If the hopping scheme for the DM-RS sequence is disabled in the LTE Rel-8 system or is not slot-wise hopping in existing LTE Rel-8 systems such as subframe-by-hopping In order to distinguish a plurality of UEs from each other in the MU-MIMO, a different OCC index value is allocated to each UE as shown in Equation (6), but the same OCC index is allocated to each layer. That is, if the UE 1 has the OCC index of 0 in the MU-MIMO environment and the UE 2 has the OCC index of 1, the UE 1 must set the OCC index value to 0 for all the layers, The OCC index value should be 1. At this time, the upper layer receives the CS parameter value of 3 bits in consideration of the CS-OCC linkage group as shown in Table 5

To be transmitted. That is, in the case of MU-MIMO, by the system upper layer, the CS parameter value

When scheduling to determine the CS parameter value of each CS-OCC linkage group,

May be scheduled to be selected. In particular, two UEs (UEs) with non-equal-size bandwidth resource allocations must have CS parameter values of different CS-OCC linkage groups

To be transmitted. (In the MU-MIMO environment, for two UEs with equal bandwidth resource allocation, the CS parameter values of different CS-OCC linkage groups

It is not necessary to be scheduled to receive the CS parameter value of the CS-OCC linkage group A of Table 2 for one UE)

OCC linkage group B of Table 2 for the other UE, the CS parameter values of the CS-

To be transmitted. For example, for UE1, for the first layer, the CS parameter value

OCC linkage group A in Table 2, UE2 transmits a CS parameter value

Of the CS-OCC linkage group B shown in Table 2 is received. In this case, since two UEs in the MU-MIMO environment always have different OCC indices, they can always be distinguished. Equation (6) is associated with Equation (5). Equation (8) below may also be applied to MU-MIMO in conjunction with Equation (7).

&Quot; (8) "

8 is a diagram illustrating a process in which a UE selects an orthogonality allocation rule and calculates an OCC in control information transmitted from a base station in a MU-MIMO according to an embodiment of the present invention. In FIG. 8, in the first UE group and the second UE group, which are two user terminal groups, the UE 1 801 serving as one UE in the first UE group and the UE 2 802 serving as one UE in the second UE group The eNB 809 sets a 3-bit CS parameter and transmits it to the control information. Here, each UE group may include one or more UEs, but generally, when considering two UEs, each UE group corresponds to one UE. In this case, the UEs 801 and 802 can calculate the OCC value through the CS parameter without signaling them separately. Also, the UE can confirm the orthogonality allocation rule through the sequence hopping. In FIG. 8, since the case of MU-MIMO is mainly described, it is limited to cases in which sequence hopping is inactivated or hopping is performed for each subframe. As a result, the orthogonality allocation rule is also limited to the same method.

)와 CS값을 구하는데 필요한 사이클릭 쉬프트 파라메터의 값으로 표 1과 같이 상위 레이어에 의해 주어지는

와 수학식 2와 같이

를 산출한다(S810, S815). 베이스 시퀀스는 그룹 넘버, 그룹 내의 베이스 시퀀스 넘버 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. 그 결과, 실질적으로 상위단이 스케쥴링(scheduling)하여 기지국(eNB 등)을 통해 전송하게 되는 파라메터는

이며, 이 값에 의해 따라 UL DM-RS의 CS(Cyclic Shift)값이 서로 다른 값을 가지게 된다. UE1 801 and UE2 802 may generate a base sequence based on the zadoff-chu sequence for the UL DM-RS sequence

) And the value of the cyclic shift parameter required to obtain the CS value, as shown in Table 1

And Equation 2

(S810, S815). The base sequence is generated differently by the group number, the base sequence number in the group, and the length n of the sequence. However, the base sequence of the UL DM-RS occupying the same frequency band in the same base station (cell, etc.) and slot time is the same. As a result, the parameters that are actually transmitted through the base station (eNB or the like) by scheduling by the upper layer are

And according to this value, the CS (Cyclic Shift) value of the UL DM-RS has a different value.

S810, and S815 may be performed after various steps of FIG. 8, reflecting the configuration of the system or multiple connection states, and may be performed in combination with the various steps of FIG.

)이 포함된 DCI format 0를 제어 신호에 포함시켜 생성한다(S816). S816에서 기지국 등은 스케쥴링(scheduling) 대상인 각 UE가 SU-MIMO로 작용할 것인지, MU-MIMO의 한 UE로 작용할 것인지를 상위단에서 판단하여, 해당 UE가 MU-MIMO로 작용할 경우, 상기 표 5 CS-OCC 링키지 그룹을 고려하여 서로 다른 그룹에 포함된

가 각각의 UE들에게 송신되도록 한다(S816). 이는 각각의 UE가 서로 다른 OCC 값을 산출할 수 있도록 CS 값을 할당하는 것을 의미한다.On the other hand, the base station (eNB, etc.) determines the 3-bit CS parameter value (

) Is included in the control signal (S816). In step S816, the base station determines in step S816 whether each UE to be scheduled is to function as SU-MIMO or a UE in MU-MIMO. If the corresponding UE functions as MU-MIMO, Consider the -OCC linkage group,

To be transmitted to the respective UEs (S816). This means assigning a CS value such that each UE can produce a different OCC value.

을 전송하게 되는데, MU-MIMO의 경우, 시스템 상위단에 의해 각 UE별로 결정된 3bit의 CS 파라메터 값

은 상기 표 5의 CS-OCC 링키지 그룹 A의 4가지 값 중 하나를 UE1(801)에게, 그리고 CS-OCC 링키지 그룹 B의 중 4가지 값 중 하나를 UE2(802)에게 전송하게 된다. 보다 상세히 살펴보면, MU-MIMO의 경우, 시스템 상위단에 의해서 각 UE별로 CS 파라메터의값

을 결정하기 위해서 스케쥴링(scheduling) 될 때, 각 UE는 서로 다른 CS-OCC 링키지 그룹의 CS 파라메터 값

을 선택하도록 스케쥴링될 수 있다. 즉 CS-OCC 링크에 따라 시스템 상위단에서는 UE1(801)에 대해 제1OCC 값과 관련된

를, 그리고 UE2(802)에 대해 제2OCC 값과 관련된

를 CS 파라메터의 값으로 할당하여

를 수신한 UE1, 2가 서로 다른 OCC를 할당할 수 있도록 한다.Here, the 3-bit CS parameter value (DCI format 0)

In the case of MU-MIMO, the 3-bit CS parameter value determined for each UE by the system upper layer

OCC linkage group A of Table 5 to UE1 801 and one of four values of CS-OCC linkage group B to UE2 802. [ In more detail, in the case of MU-MIMO, the value of the CS parameter

When scheduling to determine the CS parameter value of each CS-OCC linkage group,

May be scheduled to be selected. In other words, according to the CS-OCC link, in the higher level of the system, for UE1 801,

And a second OCC value for UE2 802

To the value of the CS parameter

The UEs 1 and 2 can receive different OCCs.

을 전송 받도록 스케쥴링(scheduling) 할 수 있다. (MU-MIMO 환경에서, 할당된 대역폭이 서로 동일한(equal bandwidth resource allocation) 두 개의 단말(UE)에 대해서는 반드시 서로 다른 CS-OCC 링키지 그룹의 CS 파라메터 값

을 전송 받도록 스케쥴링 될 필요는 없다) 즉 UE1(801)에 대해서는 OCC값이 0인 경우와 관련된 CS-OCC 링키지 그룹A의 4가지의 CS 파라메터 값

중 하나를 전송 받도록 스케쥴링 되었다면, 다른 하나의 UE에 대해서는 OCC값이 1인 경우와 관련된 CS-OCC 링키지 그룹 B의 4가지의 CS 파라메터 값

중 하나를 전송 받도록 스케쥴링되는 것이다. 예를 들면 UE1은 특정 레이어(layer)에 대해서, CS 파라메터 값

으로 CS-OCC 링키지 그룹 A의 4가지 값 중 하나인 0을 전송 받았다면, UE2는 동일 레이어(layer)에 대해서, CS 파라메터 값

으로 CS-OCC 링키지 그룹 B의 4가지 값 중 하나인 3을 전송 받는 식이다. 이럴 경우, MU-MIMO환경에서 2개의 UE의 경우 반드시 서로 다른 OCC 인덱스(index)를 가지게 되므로, 항상 구별이 가능하게 된다. 설명의 편의를 위하여 도 8의 일 실시예로 UE1(801)에는 제 1OCC 값인 0과 관련하여 CS-OCC 링키지 그룹 A의 0이

로 송신되며, UE1(801)에는 제 2OCC 값인 1과 관련하여 CS-OCC 링키지 그룹 B의 3이

로 송신된 경우를 가정한다.In particular, two UEs (UEs) with non-equal bandwidth resource allocations must always have CS parameter values of different CS-OCC linkage groups

May be scheduled to be received. (In the MU-MIMO environment, the CS parameter values of different CS-OCC linkage groups necessarily have to be equal for two UEs with equal bandwidth resource allocation)

OCC linkage group A related to the case where the OCC value is 0 for the UE1 801. The CS parameter values of the CS-

OCC linkage group B related to the case where the OCC value is 1 for the other UE, the four CS parameter values of the CS-OCC linkage group B

To be transmitted. For example, UE1 may determine the CS parameter value

OCC linkage group A, which is one of the four values of the CS-OCC linkage group A, UE2 transmits a CS parameter value

And the CS-OCC linkage group B, which is one of four values, is transmitted. In this case, since two UEs in the MU-MIMO environment always have different OCC indices, they can always be distinguished. For convenience of description, in an embodiment of FIG. 8, UE1 801 is assigned a 0 in CS-OCC linkage group A with respect to a first OCC value of 0

And UE1 801 is assigned a third of the CS-OCC linkage group B with respect to the second OCC value of 1. [

As shown in FIG.

를 3bit의 CS 파라메터로 포함되도록 제어 정보를 생성하고(S816), 상기 생성된 제어 정보를 UE들에게 송신한다(S818, S819). 보다 상세하게는 이 3bit의 값은 DCI format 0에 CS(Cyclic shift) 필드에 실려서 송신될 수 있다. The base station is configured differently for each UE

(S816), and transmits the generated control information to the UEs (S818 and S819). More specifically, the 3-bit value can be transmitted in a cyclic shift (CS) field in DCI format 0.

Also, transmission in steps S818 and S819 may be performed sequentially or at time intervals, and in step S816, control information may be generated and transmitted to UE1 and UE2 with a time difference. Hereinafter, since the processes in UE1 and UE2 are also performed independently, the processes of UE1 and UE2 are not limited to the order in which they are temporally specific to each other. Hereinafter, the process itself in both UEs 1 and 2 is the same in this independent process. Therefore, the description of FIG. 8 implies that the processes of FIG. 8 are performed at the same time or with a certain relation in UE1 and UE2 no.

를 산출한다(S820, S825). UE1 and UE2 receive 3-bit CS parameter values

(S820, S825).

에서 nCS및 α를 계산하고, 표 5에서

값에 의해

를 산출하여, OCC를 계산할 수 있다(S830, S835). 예를 들어 UE1(801)의

값이 0인 경우, 표 5에 의하여

는 0이 되며, 그 결과 UE1(801)의 OCC는 [+1, +1]이 된다. 또한, UE2(802)의

값이 3인 경우, 표 5에 의하여

는 1이 되며, 그 결과 UE1(801)의 OCC는 [+1, -1]이 된다.Then calculate the CS and OCC values of the first layer. In Equation 2,

Lt; / RTI > and < RTI ID = 0.0 >

By value

And OCC can be calculated (S830, S835). For example, the UE1 801

If the value is 0, according to Table 5

Becomes 0, and as a result, the OCC of UE1 801 becomes [+1, +1]. In addition,

If the value is 3, according to Table 5

Becomes 1, and as a result, the OCC of UE1 801 becomes [+1, -1].

값이 표 5의 CS-OCC 링키지 그룹 A에 해당하는 0, 6, 4, 10 중 하나일 경우

는 별도의 정보 수신 없이도 표 5에 의해 0으로 자동 계산되게 된다. 반대로 수신한

값이 표 5의 CS-OCC 링키지 그룹 B에 해당하는 3, 9, 2, 8 중 하나일 경우

는 별도의 정보 수신 없이 1로 자동 계산되게 된다. 이 때, 표 5에서는

가 0이면 OCC {+1, +1}을 의미하며

가 1이면 OCC {+1, -1}를 의미하지만, 의미와 내용이 바뀌지 않는 한도 내에서 OCC 인덱스를 표현하는 파라메터의 수학적인 표현과 그 값이 한정되지 않는다.Therefore, UE1 801 and UE2 802 receive

If the value is one of 0, 6, 4, or 10 corresponding to the CS-OCC linkage group A in Table 5

Is automatically calculated as 0 by Table 5 without receiving any additional information. Conversely,

If the value is one of 3, 9, 2, or 8 corresponding to CS-OCC linkage group B in Table 5

Is automatically calculated as 1 without receiving any additional information. At this time, in Table 5

0 means OCC {+1, +1}.

1 means OCC {+1, -1}, but the mathematical expression and the value of the parameter representing the OCC index are not limited unless the meaning and contents are changed.

값으로 UE1(801)는 0, UE2(802)는 3의 값을 산출한 상태이다. UE1 801 has an OCC value of [+1, +1] and UE2 802 has an OCC value of [+1, -1] at S830 and S835. Of course,

The value of UE1 801 is 0, and the value of UE2 802 is 3.

에서 추가 할당할 레이어, 즉 2~N번째 레이어의 CS 값을 계산한다(S840, S845). When the CS and OCC values for the first layer are set, the UE1 801 and the UE2 802 check if there is a layer to be additionally allocated. If there is an additional layer to be allocated,

I.e., the 2 < nd > to N < th > layers (S840 and S845).

로부터 해당 레이어의 CS 값

를 계산하는 규칙(CS 할당 방법, CS allocation rule)을 적용할 수 있는데, 이 규칙은 도 7에서 살펴본 바와 같이 각 레이어에 할당되는 CS 값들이 가능한 한 서로 최대의 거리를 가지도록 정해지는 것이 레이어간 간섭을 줄이도록 CS 값을 설정하는 것이다. 각 레이어의 개수에 따라 각 레이어에 할당되는 CS 값들이 가능한 서로 최대의 거리를 가지도록 하는 CS 할당 룰의 일 실시예로 전술한 수학식 3을 참고할 수 있다. Here, the CS parameter value of the first layer

The CS value of the corresponding layer

(CS allocation method), which can be applied to calculate the CS values assigned to the respective layers as shown in FIG. 7, The CS value is set to reduce interference. The above-described Equation (3) can be referred to as an embodiment of the CS allocation rule that allows the CS values assigned to each layer to have a maximum distance from each other as much as possible according to the number of layers.

값으로 UE1(801)는 0, UE2(802)는 3의 값을 산출한 경우, UE1(801)의 레이어 각각에 대한

은 i) 랭크가 2인 경우 제 1, 2 레이어에 대하여 각각 {0, 6}이 되며, iii) 랭크 3인 경우 제 1, 2, 3 레이어에 대해 각각{0, 4, 8}이 되며, iv) 랭크 4인 경우 제 1, 2, 3, 4 레이어에 대해 각각 {0, 3, 6, 9} 혹은 {0, 6, 3, 9} 가 된다.Note that,

When the UE1 801 calculates a value of 0 and the UE2 802 calculates a value of 3 for each layer of the UE1 801,

I} is {0, 6} for the first and second layers when the rank is 2, and iii) {0, 4, 8} for the first, second and third layers when it is rank 3, iv) For rank 4, it is {0, 3, 6, 9} or {0, 6, 3, 9} for the first, second, third and fourth layers respectively.

은 i) 랭크가 2인 경우 제 1, 2 레이어에 대하여 각각 {3, 9}가 되며, iii) 랭크 3인 경우 제 1, 2, 3 레이어에 대해 각각{3, 7, 11}이 되며, iv) 랭크 4인 경우 제 1, 2, 3, 4 레이어에 대해 각각 {3, 6, 9, 0} 혹은 {3, 9, 6, 0} 이 된다. 수학식 3 이외에도 레이어별로 최대로 이격되도록 설정하는 방식을 적용할 수 있다.For each layer of UE2 802,

3, 7, 11} for the first, second and third layers when i) the rank 3 is {3, 9} for the first and second layers, iv) For rank 4, it is {3, 6, 9, 0} or {3, 9, 6, 0} for the first, second, third and fourth layers respectively. In addition to Equation (3), a method of setting the maximum spacing for each layer can be applied.

를 통해 첫번째 레이어의 OCC를 산출하였다. 그리고 OCC 역시 직교성을 가지도록 할당될 수 있다. 제 1 레이어의 OCC(즉,

를 통해 산출된 값)값과 동일하게 제 2, 3, … 레이어의 OCC를 할당할 수 있다. 이는 UE 간에 직교성을 가지도록 OCC를 할당하는 직교성 할당 룰을 적용하여 진행될 수 있다. After the CS value is calculated for each layer, the UE1 801 and the UE2 802 determine whether the sequence hopping is Disabled or the subframe hopping and select the orthogonality allocation rule in the same manner, The OCC indexes of the 2 < nd > -th layer are calculated with the same values (S850, S855). As we have seen,

The OCC of the first layer was calculated. The OCC can also be assigned to have orthogonality. The OCC of the first layer (i.e.,

The values of the second, third, ..., and < RTI ID = 0.0 > You can assign a layer's OCC. This can be done by applying an orthogonality assignment rule that assigns OCCs to have orthogonality between UEs.

가 동일하도록 설정한다.In order to guarantee the maximum orthogonality between the UEs as shown in Equations 6 and 8 shown in FIG. 7, it is assumed that the first, second, third, and fourth layers

Are equal to each other.

In steps S830 and S835, the UE1 801 has 0 as the OCC index and [+1, +1] as the OCC value. UE2 802 has 1 as an OCC index and [+1, -1] as OCC value. As a result, the OCC index value for each layer of the UE1 801 is i) for {0, 0} for the first and second layers when the rank is 2, and iii) for the first, 0, 0, 0} for the first layer, {0, 0, 0} for the first layer,

The OCC index value for each layer of the UE2 802 is {1, 1} for the first and second layers when i) the rank is 2, and iii) when the rank is 3, 1, 1, 1} for the first, second, third, and fourth layers, respectively, for {

에 수학식 1을 적용하여 각 레이어의 DM-RS 시퀀스를 생성하고, 각 레이어별로 정해진 OCC 인덱스에서의 시퀀스 값(+1 또는 -1)을 곱하여 최종 UL DM-RS 시퀀스를 생성한다(S860, S865). 그리고, 생성된 DM-RS 시퀀스는 각 슬롯의 해당 심볼에 매핑되는데, 이는 리소스 자원 매퍼(resource element mapper)를 통해 매핑된다(S870, S875). 상기 심볼은 PUSCH와 연계된 DM-RS의 매핑되는 심볼은 앞서 살펴본 바와 같이, normal CP(Cyclic Prefix)를 사용할 경우 매 슬롯(slot)의 7번째 심볼 중 4번째 심볼에, 그리고 extended CP 사용시에는 매 슬롯의 심볼 중 3번째 심볼에 해당한다. PUCCH와 연계된 DM-RS의 경우 상기 해당 심볼은 매 슬롯에서 최대 3개의 심볼이 될 수 있으며, 해당 심볼의 개수 및 위치는 앞서 살펴본 표 3과 같이 CP의 종류와 PUCCH의 포맷에 따라 상이하다. 상기 매핑이 완료하면 SC FDMA 생성기(generator)를 통해 상기 DM-RS 시퀀스가 매핑된 리소스 엘리먼트(Resource Element, RE)로부터 SC-FDMA 심볼을 생성하고(S880, S885) DM-RS 신호를 기지국에 전송한다(S890, S895).When the CS and OCC calculation for the allocated layers is completed, the UE1 801 and the UE2 802 transmit a base sequence and a CS (Cyclic Shift) value

RS sequence of each layer by applying Equation (1), and multiplies the sequence value (+1 or -1) in the OCC index determined for each layer to generate a final UL DM-RS sequence (S860, S865 ). The generated DM-RS sequence is mapped to a corresponding symbol of each slot, which is mapped through a resource element mapper (S870, S875). As described above, the mapped symbols of the DM-RS associated with the PUSCH are allocated to the fourth symbol of the seventh symbol of each slot when a normal CP (Cyclic Prefix) is used, and when the extended CP is used, And corresponds to the third symbol among the symbols of the slot. In the case of the DM-RS associated with the PUCCH, the corresponding symbol can be a maximum of 3 symbols in each slot. The number and position of the corresponding symbols are different according to the type of the CP and the format of the PUCCH as shown in Table 3 above. Upon completion of the mapping, an SC-FDMA symbol is generated from a resource element (RE) to which the DM-RS sequence is mapped through an SC FDMA generator (S880, S885) (S890, S895).

FIGS. 7 and 8 show a process in which a UE determines a sequence hopping scheme and selects an orthogonality allocation rule.

FIGS. 7 and 8 show a process of selecting a sequence hopping scheme and selecting an orthogonality allocation rule. In the process of allocating a CS value in a base station, the UE performs an implicit assignment can do.

In more detail, the method of Table 5 is further subdivided and the CS-OCC linkage group is divided according to SU-MIMO and MU-MIMO. That is, the CS-OCC linkage group is roughly divided into two for SU-MIMO and MU-MIMO, and the MU-MIMO is again divided into two groups for two UEs. An example of the sharing method is shown in Table 7 below. In Table 7, the linkage group is divided into A / B (B-1, B-2) according to the CS parameter, the UE can deduce the OCC index thereon, and the orthogonality allocation rule can also be inferred.

[Table 7] CS-OCC linkage rule

The above method is a method of changing the CS and OCC allocation rules according to the CS parameter value for the initial first layer. That is, whether the CS parameter value for the initial first layer belongs to the CS-OCC linkage group (A) for SU-MIMO or the CS-OCC linkage group (B-1, B-2) for MU-MIMO CS and OCC allocation rules are different. For example, if the CS parameter value for the first layer belongs to the CS-OCC linkage group for SU-MIMO (group A in Table 7 above), the CS and OCC allocation rules in Equation 9 below are applied. If the CS parameter value for the first layer belongs to the CS-OCC linkage group for MU-MIMO (group B-1 or B-2 in Table 7 above), the CS and OCC allocation rules in Equation 10 below are applied Receive

Equation (9) shows a case where the linkage group A is applied.

&Quot; (9) "

When the CS parameter value for the first layer belongs to the CS-OCC linkage group for SU-MIMO (group A in Table 7 above), the CS and OCC allocation rules in Equation (9) are applied, As shown in Equation (9), OCC index values in each layer are allocated to each other in an intersecting manner. That is, if the OCC index value of the first layer is 0, the OCC index value of the second layer is 1, the OCC index value of the third layer is 0, and the OCC index value of the fourth layer is 1 For example. At this time, the CS value for the first layer to be signaled by the upper layer is one of the four CS values belonging to the group for SU-MIMO among the CS-OCC linkage group, as shown in Table 7 above.

Equation (10) is applied when the linkage group is B (B-1, B-2).

&Quot; (10) "

을 스케쥴링하여 전송하게 된다. 즉 MU-MIMO의 경우, 시스템 상위단에 의해서 각 UE별로 CS 파라메터 값

을 결정하기 위해서 스케쥴링(scheduling) 될 때, 각 UE는 MU-MIMO를 위한 CS-OCC 링키지 그룹 (표 7에서 Group B) 내의 2개의 그룹에 대해서 서로 다른 CS-OCC 링키지 그룹의 CS 파라메터 값

을 선택하도록 스케쥴링될 수 있다. 특히나 할당된 대역폭이 서로 동일하지 않은(non-equal size bandwidth resource allocation) 두 개의 단말(UE)은 반드시 MU-MIMO를 위한 CS-OCC 링키지 그룹 (표 4에서 Group B) 내의 2개의 그룹에 대해서 서로 다른 CS-OCC 링키지 그룹의 CS parameter 값

을 전송 받도록 스케쥴링(scheduling) 되어야 한다. (MU-MIMO 환경에서, 할당된 대역폭이 서로 동일한(equal bandwidth resource allocation) 두 개의 단말(UE)에 대해서는 반드시 서로 다른 CS-OCC 링키지 그룹의 CS parameter 값

을 전송 받도록 스케쥴링 될 필요는 없다) 즉 하나의 UE에 대해서는 MU-MIMO를 위한 CS-OCC 링키지 그룹 (표 4에서 Group B) 내의 2개의 그룹 중 CS-OCC 링키지 그룹 B-1의 2가지의 CS parameter 값

중 하나를 전송 받도록 스케쥴링 되었다면, 다른 하나의 UE에 대해서는 CS-OCC 링키지 그룹 B-2의 2가지의 CS 파라메터 값

중 하나를 전송 받도록 스케쥴링되는 것이다. 예를 들면 UE1은 첫번째 레이어에 대해서, CS 파라메터 값

으로 CS-OCC 링키지 그룹 B-1의 2가지 값 중 하나인 4을 전송 받았다면, UE2는 동일 레이어 에 대해서, CS 파라메터 값

으로 CS-OCC 링키지 그룹 B-2의 2가지 값 중 하나인 8을 전송 받는 식이다. 이럴 경우, MU-MIMO환경에서 2개의 UE의 경우 반드시 서로 다른 OCC 인덱스를 가지게 되므로, 항상 구별이 가능하게 된다. When the CS parameter value for the first layer belongs to the CS-OCC linkage group for MU-MIMO (Group B in Table 7 above), different OCC index values are allocated to UEs as shown in Equation (10) The same OCC index is assigned to each layer. That is, if the UE 1 has the OCC index of 0 in the MU-MIMO environment and the UE 2 has the OCC index of 1, the UE 1 must set the OCC index value to 0 for all the layers, The OCC index value should be 1. At this time, the upper layer receives the 3-bit CS parameter value (B-1, B-2) in consideration of the two groups (B-1 and B-2) in the CS-OCC linkage group for MU-

To be transmitted. That is, in the case of MU-MIMO, by the system upper layer, the CS parameter value

Each UE determines the CS parameter value of a different CS-OCC linkage group for two groups in the CS-OCC linkage group for MU-MIMO (Group B in Table 7)

May be scheduled to be selected. In particular, two UEs (UEs) with non-equal bandwidth resources allocated to the same MIMO-MIMO MIMO MIMO MIMO MIMO MIMO MIMO MIMO MIMO MIMO MIMO MIMO MIMO MIMO MIMO MIMO MIMO CS parameter value of other CS-OCC linkage group

To be transmitted. (In the MU-MIMO environment, the CS parameter values of different CS-OCC linkage groups must be set for two UEs with equal bandwidth resource allocation

OCC link group B-1 of the two groups in the CS-OCC linkage group (Group B in Table 4) for MU-MIMO for one UE, parameter value

OCC linkage group B-2 for the other UE, the CS parameter value of the CS-OCC linkage group B-2

To be transmitted. For example, for UE1, for the first layer, the CS parameter value

UE 4 receives one of the two values of the CS-OCC linkage group B-1, UE2 transmits the CS parameter value

And one of two values of the CS-OCC linkage group B-2 is received. In this case, since two UEs in the MU-MIMO environment always have different OCC indices, they can always be distinguished.

Equation (9) can also be modified in the same manner as Equation (11). In this case, the OCC value is the same for the first two layers, and is different for the remaining two layers and divided into two. That is, Equation (9) is a crossing method among non-identical methods in the orthogonality assignment rule, and Equation (11) shows a dichotomous method among non-uniform methods in the orthogonality assignment rule. Equation (10) can also be constructed in the same manner as Equation (12) in conjunction with Equation (11).

&Quot; (11) "

&Quot; (12) "

The process of determining which linkage the CS parameter is included in is mainly similar to that of FIGS. A more detailed description is shown in FIG.

9 is a diagram illustrating a process of providing the UE with an implicit method in which the UE can infer the orthogonality allocation rule in the process of assigning a CS value to the base station. 7, only steps S915 and S936 in FIG. 9 are different from those in FIG. 7, and the other steps (S710, S720, S725, S730, S735, S737, S739, S745, S750, S755, S760) , The description of Fig.

) 이 포함된 DCI format 0를 제어 신호에 포함시켜 생성한다(S915). S915에서 기지국 등은 스케쥴링(scheduling) 대상인 각 UE가 SU-MIMO(또는 균등 리소스 할당 방식의 MU-MIMO 포함)로 작용할 것인지, MU-MIMO(보다 상세히 비균등 리소스 할당 방식의 MU-MIMO 포함)의 한 UE로 작용할 것인지를 상위단에서 판단하여, 해당 UE가 SU-MIMO(또는 균등 리소스 할당 방식의 MU-MIMO 포함)로 작용할 경우, 상기 표 7의 CS-OCC 링키지 그룹 A에 포함되는 3bit의의 CS 파라메터 값(DCI format 0)

을 전송하게 된다. 한편 MU-MIMO인 경우, 각 UE 별로 표 7의 링키지 그룹 중 하나의 UE에 대해서는 B-1 그룹의 CS 파라메터 값을, 그리고 다른 UE에 대해서는 B-2 그룹의 CS 파라메터 값을 선택하여 전송하게 된다. 이후 CS 파라메터를 UE가 수신하여 OCC 값을 유추하는 과정은 도 7과 같다.The base station (eNB, etc.) refers to the linkage group of Table 7 and determines the 3-bit CS parameter value (

) Is included in the control signal (S915). In step 915, the base station determines whether each UE to be scheduled is to function as SU-MIMO (or MU-MIMO in the uniform resource allocation scheme) or MU-MIMO (including MU-MIMO in the non-uniform resource allocation scheme) OCC linkage group A of Table 7, if the corresponding UE functions as SU-MIMO (or MU-MIMO of the uniform resource allocation scheme) Parameter value (DCI format 0)

. On the other hand, in the case of MU-MIMO, the CS parameter value of the B-1 group is transmitted to one of the linkage groups of Table 7 for each UE, and the CS parameter value of the B-2 group is transmitted to the other UEs . The process of the UE receiving the CS parameter and inferring the OCC value is shown in FIG.

And check which group the CS parameter is included in the OCC value. In the case of the CS value included in the group A (first linkage group) among the linkage groups in Table 7, the OCC value is set for the remaining layers in a crossing or a nondegradation manner, in which the orthogonality allocation rule is such that the layers can be discriminated S737).

Meanwhile, if the OCC value belongs to the linkage group B of Table 7, the OCC can distinguish the UEs other than the layer. The orthogonality allocation rule is applied in the same manner so that the same OCC value is set for the remaining layers (S739). Hereinafter, a process of generating a reference signal sequence by applying a CS value and an OCC to each layer and transmitting the reference signal sequence to a base station is the same as that of steps S745, S750, S755, and S760 of FIG.

10 is a diagram illustrating a process in which a UE selects an orthogonality allocation rule and calculates an OCC in control information transmitted from a base station in a MU-MIMO according to an embodiment of the present invention. FIG. 10 shows a process of selecting a CS parameter in the linkage groups B-1 and B-2 to be used in the case of MU-MIMO in the linkage group of Table 7. FIG.

In Fig. 10, steps S1015, S1050, and S1055 are different from those of Fig. 8, and the remaining steps are the same as those of Fig. 8, and the description of Fig. 8 is supposed.

In a first UE group and a second UE group, which are two user terminal groups, an eNB (a base station) for a UE1 801 serving as a UE in a first UE group and a UE2 802 serving as a UE in a second UE group 809) sets the 3-bit CS parameter and transmits it to the control information. Here, each UE group may include one or more UEs, but generally, when considering two UEs, each UE group corresponds to one UE. In this case, the UEs 801 and 802 can calculate the OCC value through the CS parameter without signaling them separately. Also, the UE can confirm the orthogonality allocation rule through the sequence hopping. In FIG. 10, since the case of MU-MIMO is mainly described, the selection is limited to the linkage group B-1 / B-2, and the orthogonality allocation rule is also limited to the same method.

) 이 포함된 DCI format 0를 제어 신호에 포함시켜 생성한다(S1016). S1016에서 기지국 등은 스케쥴링(scheduling) 대상인 각 UE가 SU-MIMO로 작용할 것인지, MU-MIMO의 한 UE로 작용할 것인지를 상위단에서 판단하여, 해당 UE가 MU-MIMO로 작용할 경우, 상기 표 7 CS-OCC 링키지 그룹 B-1, B-2를 고려하여 서로 다른 그룹에 포함된

가 각각의 UE들에게 송신되도록 한다(S1016). 이는 각각의 UE가 서로 다른 OCC 값을 산출할 수 있도록 CS 값을 할당하는 것을 의미한다.On the other hand, the base station (eNB, etc.) determines the 3-bit CS parameter value (

) Is included in the control signal (S1016). In step S1016, the base station or the like determines at a higher level whether each UE to be scheduled is to function as SU-MIMO or as a UE of MU-MIMO. If the corresponding UE functions as MU-MIMO, Considering -OCC linkage groups B-1 and B-2,

To be transmitted to the respective UEs (S1016). This means assigning a CS value such that each UE can produce a different OCC value.

After the steps S818 to S845 are performed, the UEs 1 and 2 derive the OCC values from the received CS values in the linkage group as shown in Table 7. If the linkage group that calculated the OCC value is A / B-1 / B-2, the orthogonality allocation rule is the same for B-1 and B-2 and the OCC value is set to the same for the remaining layers (S1050, S1055). As a result, UE1 / UE2 have different OCC values and can distinguish UE1 / UE2 through OCC.

Hereinafter, a process of generating a reference signal sequence by applying a CS value and an OCC to each layer and transmitting it to a base station is the same as that of steps S860 to S895 of FIG. 8, and therefore, a description thereof will be given instead.

Table 8 is a diagram illustrating an example of selecting an orthogonality allocation rule according to the environment of SU-MIMO and MU-MIMO without additional signaling in a state where the UE does not recognize whether the UE is SU-MIMO or MU- FIG. 5 is a diagram showing a configuration of a star CS value and an OCC index value. FIG.

[Table 8]

In the case of SU-MIMO in Table 8, the UE has a different OCC value for each layer. On the other hand, in the case of MU-MIMO, UE A has [+1, +1], which is the same OCC for each layer, and UE-B has [+1, -1] with OCC different layer by layer for different values from UE-A.

11 is a diagram of a configuration of an apparatus for transmitting a cyclic shift parameter that provides orthogonality according to an embodiment of the present invention.

The configuration of FIG. 11 can be a base station.

The overall configuration includes a user terminal configuration state determination unit 1110, an orthogonality allocation rule determination unit 1120, a cyclic shift parameter determination unit 1130, a signal generation unit 1150, and a transmission / reception unit 1160, And may further include a shift-orthogonality mapping unit 1140.

The user terminal configuration state determination unit 1110 determines a multiple access state of one or more user terminals, i.e., a UE. Whether the UE operates as SU-MIMO, MU-MIMO, or the like.

The orthogonality allocation rule determination unit 1120 determines an orthogonality allocation rule according to the determined multiple access state of the user terminal. As described above, the UE determines whether the orthogonality allocation rule is to be selected according to the hopping scheme for the reference signal sequence, and determines the orthogonality allocation rule that the UE determines and selects the hopping scheme. Also, as in the embodiment of Table 7, the UE can determine the orthogonality allocation rule that can be inferred using the value of the cyclic shift parameter.

The cyclic shift parameter determination unit 1130 determines information related to the orthogonality according to the determined multiple access state of the user terminal and a cyclic shift parameter capable of calculating the determined orthogonality allocation rule.

The signal generator 1150 generates a signal for transmitting the control information including the determined cyclic shift parameter to the user terminal, and the transmitter / receiver 1160 transmits the signal to the user terminal.

The cyclic shift parameter determiner 1130 can determine a cyclic shift parameter that can calculate orthogonality allocation rules and information related to orthogonality according to the determined multiple access state of the UE.

When the embodiment of FIGS. 7 and 8 is applied, the UE can confirm the orthogonality allocation rule through the sequence hopping method. If the UE's multi-connection status is SU-MIMO, the UE configuration status determiner 1110 can select among all available cyclic-shift parameters that can be assigned to the UE. This includes the example shown in FIG. 7 above. Meanwhile, when determining that the UE's multiple access state is MU-MIMO and includes the first UE and the second UE in the user terminal configuration state determination unit 1110, in allocating the cyclic-shift parameter as shown in FIG. 8, It is possible to select a cyclic shift parameter included in a different group or set or the like so that different orthogonality related indicators can be calculated.

In more detail, the first cyclic shift parameter to be received by the first UE and the second cyclic shift parameter to be received by the second UE are determined, and the first information related to the orthogonality, which is calculated in the first cyclic shift parameter, May be different from the second information related to the orthogonality calculated in the second cyclic shift parameter.

9 and 10, the UE can confirm the orthogonality allocation rule and the orthogonality-related information using the linkage group as shown in Table 7. [ When the UE's multiple access state is SU-MIMO, the UE configuration state determiner 1110 can select among the cyclic-shift parameters that can be allocated to UEs in the SU-MIMO environment, such as group A in Table 7 have. This includes the example shown in FIG. 9 above. Meanwhile, when determining that the UE's multiple access state is MU-MIMO and the first UE and the second UE are included in the UE state determination unit 1110, in allocating the cyclic-shift parameter as shown in FIG. 10, Not only the UE calculates different orthogonality related indicators by selecting cyclic shift parameters included in different groups or sets such as B-1 and B-2 of group B in Table 7, but also the orthogonality assignment rule is different from group A To be selected.

가 될 수 있으며, 직교성과 관련된 지시 정보는 OCC 인덱스를 포함한다. 따라서, 표 5, 표 7과 같은 CS-OCC 링키지 그룹을 참조할 수 있다. 이러한 정보는 사이클릭 쉬프트-직교성 매핑부(1140)에 저장될 수 있다. 보다 상세히 살펴보면, 사이클릭 쉬프트-직교성 매핑부(1140)는 상기 UE에 할당할 수 있는 모든 가능한 사이클릭 쉬프트 파라메터를 표 5와 같이 제 1 집합 및 제 2 집합으로, 또는 표 7과 같이 제 1 집합, 제 2-1집합, 제 2-2집합 나누어 저장하고, 각 집합들간의 교집합은 공집합이 되어 사이클릭 쉬프트 파라메터를 통해 직교성 관련 정보를 파악할 수 있도록 한다. 물론, 표 7과 같이 직교성 할당 룰까지도 유추할 수 있다.In one embodiment of the cyclic shift parameter in Figure 11,

And the indication information related to the orthogonality includes the OCC index. Therefore, the CS-OCC linkage group as shown in Table 5 and Table 7 can be referred to. This information may be stored in the cyclic shift-orthogonality mapping unit 1140. In more detail, the cyclic shift-orthogonality mapping unit 1140 assigns all possible cyclic shift parameters that can be assigned to the UE to the first and second sets, as shown in Table 5, , The 2-1 set, and the 2-2 set are stored, and the intersection between the sets is empty, and the orthogonality related information can be grasped through the cyclic shift parameter. Of course, the orthogonality assignment rule can be inferred as shown in Table 7.

On the other hand, the cyclic shift parameter determiner 1130 may determine the cyclic shift parameter to have different OCC indices when the bandwidth allocated to the first UE and the bandwidth allocated to the second UE are not identical.

The signal generator 1150 generates a signal for transmitting control information including the determined cyclic-shift parameter to the UE. At this time, DCI format 0 included in the PDCCH may be 0 as one embodiment of the control information. The generated signal is transmitted to the UE through the transmission / reception unit 1160.

를 DCI 포맷 0에 포함시켜 송신하며, 이 과정에서 각각의 UE가

를 통해 직교성 있는 OCC 인덱스를 가질 뿐만 아니라 각 레이어에 대하여 어떤 방식으로 OCC 인덱스를 할당할 것인지를 알 수 있도록 한다. 따라서 도 7, 8의 실시예와 같이

로 설정할 수 있는 값들이 중복되지 않도록 두 개의 그룹으로 나누어 특정 그룹의

는 OCC 인덱스 0으로, 그리고 다른 그룹의

는 OCC 인덱스 1로 산출될 수 있도록 한다. 또한, 도 9, 10과 같이 세 개의 그룹으로 나누어 직교성 할당 룰의 선택도 가능하도록 할 수 있다. 그 결과 OCC 인덱스와 직교성 할당 룰을 별도로 송신하지 않아도, UE는 수신한

를 통해 OCC 인덱스를 산출할 수 있고, 직교성 할당 룰을 적용하여 레이어 별로 CS와 OCC를 산출하여 DM-RS와 같은 참조 신호를 생성할 수 있도록 한다. The apparatus shown in Fig.

Is included in the DCI format 0 and transmitted. In this process, each UE

Not only have orthogonal OCC indexes, but also know how to allocate OCC indexes for each layer. Thus, as in the embodiment of Figures 7 and 8

Are divided into two groups so that the values that can be set in the group

With an OCC index of 0, and another group of

Can be calculated as OCC index 1. In addition, as shown in Figs. 9 and 10, the orthogonality allocation rule can be selected by dividing into three groups. As a result, even if the OCC index and the orthogonality allocation rule are not transmitted separately,

And an orthogonality allocation rule is applied to calculate CS and OCC for each layer to generate a reference signal such as DM-RS.

The cyclic shift parameter is transmitted through L3 signaling such as signaling of the physical layer L1 such as a PDCCH or signaling of a radio access control layer (MAC) (L2) or radio resource control (RRC) signaling or message But the present invention is not limited thereto, and the OCC index can be set to three or more values in addition to 0 and 1.

In the embodiments of the present invention as described above, in transmission of a reference signal such as an uplink DM-RS and the like, in an environment such as an antenna increasing in LTE-A and a new MU (Multi-User) Considering the UE (terminal) or each base station (cell), in order to increase the number of orthogonal resources to be orthogonally divided and multiplexed, the CS value (?) Of the DM- It is possible to use the basic cyclic shift parameter in the existing LTE for compatibility while maintaining the backward compatibility with the existing LTE since the parameter values to be set can be directly transmitted to satisfy the orthogonality. In particular, since the role of the OCC differs depending on whether the UE is the SU-MIMO or the MU-MIMO, the OCC can be allocated to each network connection environment to ensure orthogonality between reference signal sequences, Can be reduced.

12 is a diagram illustrating a configuration of an apparatus for receiving a cyclic shift parameter that provides orthogonality according to an embodiment of the present invention and transmitting a reference signal that satisfies orthogonality. One embodiment of FIG. 12 may be applied to a user terminal.

The overall configuration includes a receiving unit 1210, a cyclic shift parameter extracting unit 1220, an orthogonality related information calculating unit 1230, an orthogonality allocation rule selecting unit 1240, a layer-by-layer information calculating unit 1250, 1260, and a transmitting unit 1270. Each component will be described in more detail as follows.

Receiving unit 1210 receives control information from the base station. And receiving a radio signal including control information. The control information can be carried on the PDCCH.

가 포함될 수 있다.The cyclic shift parameter extracting unit 1220 extracts the cyclic shift parameter for the first layer from the control signal received by the receiving unit 1210. When the control information is transmitted on the PDCCH, the cyclic shift parameter is set to DCI format 0

May be included.

The orthogonality-related information calculation unit 1230 calculates information related to the orthogonality of the first layer in the cyclic-shift parameter for the received first layer. This can calculate the cyclic shift parameter for the received first layer based on a predetermined function or a mapping relation. The information related to the orthogonality of the first layer may be, for example, an OCC index indicating information indicating an orthogonality cover code.

For example, when the cyclic shift parameter for the received first layer, such as the CS-OCC coverage group, belongs to a particular cyclic shift parameter group, information related to orthogonality from the OCC index associated with this particular cyclic shift parameter group Can be calculated. Therefore, when one OCC and one cyclic shift parameter group including a plurality of cyclic parameters are mapped, one OCC can be calculated from all the cyclic shift parameters included in the corresponding group. This is a matter which has been examined in the CS-OCC linkage group of Table 5 or Table 7 above.

The orthogonality allocation rule selecting unit 1240 selects an orthogonality allocation rule to be applied to calculate information related to the orthogonality of the remaining layers. In more detail, if the current hopping scheme is determined as shown in FIGS. 7 and 8 and the hopping scheme is hopped on a slot-by-slot basis, the orthogonality allocation rule selector 1240 selects the orthogonality of the first layer, And selects an orthogonality assignment rule for instructing to calculate information related to orthogonality by applying an intersection or a nodal system to the remaining layers. If the hopping scheme is not a hopping scheme in units of slots, the orthogonality allocation rule selecting unit 1240 applies the same method to the remaining layers in the information related to the orthogonality of the first layer, The orthogonality allocation rule that instructs to calculate the orthogonality allocation rule.

On the other hand, referring to Table 7, as shown in Figs. 9 and 10, it is possible to confirm to which group the cyclic shift parameter belongs, and to select the related orthogonality assignment rule.

The layer-by-layer information calculation unit 1250 calculates a cyclic shift parameter for the Kth layer in the cyclic shift parameter for the first layer, and outputs the selected orthogonality allocation rule to information related to the orthogonality for the first layer Information related to orthogonality with respect to the Kth layer related to the orthogonality is calculated. Here, K denotes a K-th layer in a total of N layers if the total number of layers allocated to each UE is N, and N is a natural number of 1 or more.

That is, the cyclic shift parameter can be calculated for the second, third,... Layers in order to minimize the interference according to the number of layers used by the corresponding user terminal. Information related to orthogonality may also be calculated for each layer on the basis of the first layer.

After calculating the information necessary for generating the reference signal, the reference signal generator 1260 generates the reference signal. One embodiment of the reference signal is DM-RS. More specifically, the reference signal generator 1260 generates a reference signal for the first layer using information related to the cyclic shift parameter for the first layer and the orthogonality for the first layer, And the information related to the orthogonality with respect to the K layer is used to generate the reference signal for the second ray. Here, K denotes a K-th layer in a total of N layers if the total number of layers allocated to each UE is N, and N is a natural number of 1 or more.

One embodiment of the generation of the reference signal can be calculated as shown in Equations 1 and 2 through the cyclic shift (CS), the base sequence, and the OCC for each layer.

와

,

를 수학식 2에 적용하여 사이클릭 쉬프트(CS,

)를 산출하고, 베이스 시퀀스인

를 산출하여 수학식 1을 통해 각 레이어의 DM-RS 시퀀스를 생성한 후, 각 레이어별로 정해진 OCC 인덱스에서의 시퀀스 값(+1 또는 -1)을 곱하여 적용하여 참조 신호 시퀀스를 생성한 후, 최종 UL DM-RS 시퀀스를 생성한다. 그리고 생성된 DM-RS 시퀀스는 각 슬롯의 해당 심볼에 매핑되는데, 이는 리소스 자원 매퍼(resource element mapper)를 통해 매핑하고, 상기 매핑이 완료하면 SC FDMA 생성기(generator)를 통해 상기 DM-RS 시퀀스가 매핑된 리소스 엘리먼트(Resource Element, RE)로부터 SC-FDMA 심볼을 생성한다.The reference signal generator 1260 according to an exemplary embodiment of the present invention generates a cyclic shift parameter for each layer

Wow

,

Is applied to Equation (2) to obtain cyclic shifts CS,

), And calculates the base sequence

A DM-RS sequence of each layer is generated through Equation (1), and a sequence of reference signals is generated by multiplying the DM-RS sequence of each layer by a sequence value (+1 or -1) in a predetermined OCC index for each layer, UL DM-RS sequence. The generated DM-RS sequence is mapped to a corresponding symbol of each slot, which is mapped through a resource element mapper. When the mapping is completed, the DM-RS sequence is transmitted through an SC FDMA generator And generates an SC-FDMA symbol from the mapped resource element (RE).

Accordingly, the reference signal generator 1260 may be implemented as an independent component, but it may be implemented as a scrambler, a modulation mapper, a transform precoder, a resource element, (Resource Element Mapper) and a Single-Carrier FDMA Signal Generator (SC-FDMA Signal Generator).

The generated reference signal is transmitted to the base station through the transmitter 1270.

12, the UL DM-RS can be generated and transmitted through the cyclic shift parameter and the OCC value so as to reduce the inter-layer maximum interference when the UE is SU-MIMO. In addition, even when the UE is MU-MIMO, the UL DM-RS can be generated through the cyclic shift parameter and the OCC value so as to reduce the maximum interference between the layers and between the UEs. The cyclic shift parameter provides the UEs with information on the OCC and the orthogonality allocation rule that maintain orthogonality with each other. Therefore, under the environment of SU-MIMO, the orthogonality is guaranteed by varying the OCCs between the UE layers, The orthogonality can be guaranteed by varying the OCC for each UE. In addition, since the UEs do not perform signaling separately from the LTE system, compatibility is also satisfied.

 The reference signal generator 1260 may be implemented in the SC-FDMA signal generator or in conjunction with the SC-FDMA signal generator.

In addition, although not shown, the apparatus for applying the embodiments of Figs. 7, 8, 9, and 10 may further include an antenna number checking unit for checking the number of antennas, in addition to the components of Fig. Unit 1260 may generate an antenna-specific DM-RS sequence.

In the present specification, a cyclic shift (CS) value and an OCC (Orthogonal Cover Code) allocation method at each layer of an uplink (UL) demodulation reference signal (DM-RS) In the apparatus, when signaling is given to a UE through a base station (eNB or the like), a cyclic delay (CS) value is applied to a first layer determined by scheduling at an upper end ), A cyclic shift (CS) value of another layer from the value, and an OCC of each layer. In particular, it is possible to apply different orthogonality allocation rules for allocating CS values and OCC values according to whether the connection state of the UE is SU-MIMO or MU-MIMO, , OCC is used to identify each layer, and in MU-MIMO, OCC can be used to identify each UE. The orthogonality assignment rule also attempts to enable UL DM-RS transmission for multiple layers in an LTE-A system or the like, without additional signaling to form additional information.

While the present invention has been described in connection with what is presently considered to be the most practical and preferred embodiments, it is to be understood that the invention is not limited to the disclosed embodiments. That is, within the scope of the present invention, all of the components may be selectively coupled to one or more of them. In addition, although all of the components may be implemented as one independent hardware, some or all of the components may be selectively combined to perform a part or all of the functions in one or a plurality of hardware. As shown in FIG. The codes and code segments constituting the computer program may be easily deduced by those skilled in the art. Such a computer program can be stored in a computer-readable storage medium, readable and executed by a computer, thereby realizing an embodiment of the present invention. As the storage medium of the computer program, a magnetic recording medium, an optical recording medium, a carrier wave medium, or the like may be included.

It is also to be understood that the terms such as " comprises, "" comprising," or "having ", as used herein, mean that a component can be implanted unless specifically stated to the contrary. But should be construed as including other elements. All terms, including technical and scientific terms, have the same meaning as commonly understood by one of ordinary skill in the art to which this invention belongs, unless otherwise defined. Commonly used terms, such as predefined terms, should be interpreted to be consistent with the contextual meanings of the related art, and are not to be construed as ideal or overly formal, unless expressly defined to the contrary.

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 intended to illustrate rather than limit the scope of the present invention, and the scope of the technical idea of the present invention is not limited by these embodiments. The scope of protection of the present invention should be construed according to the following claims, and all technical ideas within the scope of equivalents should be construed as falling within the scope of the present invention.

Claims (20)

A method for generating reference signals for N integer layers by a terminal apparatus,
Receiving a cyclic shift (CS) parameter represented by a 3-bit value from a base station (eNodeB);
Generating reference signals for the N layers based on the 3-bit value; And
And transmitting the generated reference signals to the eNodeB
/ RTI >
N is 2 or 4,
Wherein generating the reference signals for the N layers comprises:
Determining, based on the cyclic shift parameter, whether or not an OCC (Orthogonal Cover Code) applied to a particular layer is the same for all N layers or different from some of the N layers;
Wherein the cyclic shift parameter indicates 011 that a cyclic shift parameter value for the first layer in the N layers is 4 or a determination as to whether the cyclic shift parameter value for the first layer indicates 2 Applying a first OCC to each of the N layers in response to the first OCC;
In response to determining whether the cyclic shift parameter is 101, the cyclic shift parameter value for the first layer is 8, or 110 indicating that the cyclic shift parameter value for the first layer is 10 Applying a second OCC to each of the N layers; And
In response to determining whether the cyclic shift parameter is one of 000, 001, 010 and 111 indicating whether the cyclic shift parameter values for the first layer are 0, 6, 3 and 9, respectively, a division scheme And applying a first OCC or a second OCC to each of the N layers according to the first OCC or the second OCC. The method according to claim 1,
Wherein the first OCC is [+1, +1] and the second OCC is [+1, -1]. The method according to claim 1,
Wherein generating the reference signals for the N layers comprises:
In response to determining whether the cyclic shift parameter is one of 000, 001, 010 and 111 indicating that the cyclic shift parameter values for the first layer are 0, 6, 3 and 9, respectively, Applying to a first layer and a second layer of the N layers and applying the second OCC different from the first OCC to a third layer and a fourth layer. The method according to claim 1,
Wherein the cyclic shift parameter values for the N layers are selected from 0, 3, 6 and 9 when the cyclic shift parameter is one of 000, 001, 010 and 111. < RTI ID = The method according to claim 1,
If the cyclic shift parameter is one of 011 and 110, the cyclic shift parameter values for the N layers are selected from 1, 4, 7, and 10,
Wherein the cyclic shift parameter values for the N layers are selected from 2, 5, 8 and 11 if the cyclic shift parameter is one of < RTI ID = 0.0 > 100 < / RTI > The method according to claim 1,
Wherein the cyclic shift parameter values for the N layers are determined based on the 3 bit values indicated in the following table and the first layer is? = 0.

The method of claim 3,
The values of the cyclic shift parameters for the N layers are determined based on the 3 bit values shown in the following table, where the first layer is? = 0, the second layer is? = 1, the third layer is? = 2, and the fourth layer is? = 3.

The method according to claim 1,
Wherein the cyclic shift parameter is a cyclic shift parameter value for the N layers shown in the following table,
The first layer is layer 0 (? = 0), the cyclic shift parameter value for layer 1 (? = 1) is ((cyclic shift parameter value for layer 0 + 6)
The cyclic shift parameter value for layer 2 (? = 2) is ((cyclic shift parameter value for layer 0) + 3) mod 12,
The cyclic shift parameter value for layer 3 (? = 3) is ((cyclic shift parameter value for layer 0) + 9) mod 12.

A method for transmitting a cyclic shift (CS) parameter from a base station (eNodeB) to a terminal device generating reference signals,
The cyclic shift parameter being 011 or 100, wherein 011 or 100 is a first OCC for each of the N layers of the terminal device;
Causing the cyclic shift parameter to be 101 or 110, wherein 101 or 110 is a second OCC for each of the N layers of the terminal device;
Wherein one of the 000, 001, 010 and 111 causes the cyclic shift parameter to be one of 000, 001, 010 and 111, OCC or the mapping of the second OCC; And
Transmitting the cyclic shift parameter to the terminal device
Lt; / RTI >
011 indicates that the cyclic shift parameter value for the first layer in the N layers is 4,
100 indicates that the cyclic shift parameter value for the first layer is 2,
101 denotes a cyclic shift parameter value for the first layer is 8,
110 denotes a cyclic shift parameter value for the first layer is 10,
Wherein the cyclic shift parameter is a value represented by 3 bits and N is 2 or 4. 10. The method of claim 9,
Wherein the first OCC is [+1, +1] and the second OCC is [+1, -1]. 10. The method of claim 9,
Further comprising receiving from the terminal apparatus reference signals generated by applying an OCC determined based on the cyclic shift parameter,
Wherein when the cyclic shift parameter is 000, 001, 010, or 111, 000, 001, 010, or 111 represents a first OCC for the first layer and the second layer among the N layers, A second OCC for the third and fourth layers,
Wherein 000, 001, 010 or 111 indicates that the cyclic shift parameter values for the first layer are 0, 6, 3, 9, respectively. 10. The method of claim 9,
Wherein the cyclic shift parameter values for the N layers are selected from 0, 3, 6, and 9 when the cyclic shift parameter is one of 000, 001, 010, and 111. 10. The method of claim 9,
If the cyclic shift parameter is one of 011 and 110, the cyclic shift parameter values for the N layers are selected from 1, 4, 7, and 10,
Wherein the cyclic shift parameter values for the N layers are selected from 2, 5, 8 and 11 if the cyclic shift parameter is one of 100 and 101. < Desc / Clms Page number 13 > 10. The method of claim 9,
Wherein the cyclic shift parameter indicates a cyclic shift parameter value for N layers as shown in the following table,
Wherein the first layer is? = 0.

12. The method of claim 11,
Wherein the cyclic shift parameter indicates a cyclic shift parameter value for N layers as shown in the following table,
Wherein the first layer is? = 0, the second layer is? = 1, the third layer is? = 2, and the fourth layer is? = 3.

10. The method of claim 9,
Wherein the cyclic shift parameter indicates a cyclic shift parameter value for N layers as shown in the following table,
The first layer is layer 0 (layer? = 0)
The cyclic shift parameter value for layer 1 (layer? = 1) is ((cyclic shift parameter value for layer 0) + 6) mod 12,
The cyclic shift parameter value for layer 2 (layer? = 2) is ((cyclic shift parameter value for layer 0) + 3) mod 12,
The cyclic shift parameter value for layer 3 (layer? = 3) is ((cyclic shift parameter value for layer 0) + 9) mod 12.

A terminal apparatus for generating reference signals for a plurality of layers,
A transmission / reception unit configured to receive a cyclic shift (CS) parameter represented by a 3-bit value from a base station (eNodeB); And
And a reference signal generator configured to generate the reference signals for N layers based on the 3-bit value,
The transceiver transmits the generated reference signals to the eNodeB,
N is 2 or 4,
Wherein the reference signal generator comprises:
Wherein the cyclic shift parameter indicates 011 that a cyclic shift parameter value for the first layer in the N layers is 4 or a determination as to whether the cyclic shift parameter value for the first layer indicates 2 Applying a first OCC to each of the N layers in response to the first OCC,
In response to determining whether the cyclic shift parameter is 101, the cyclic shift parameter value for the first layer is 8, or 110 indicating that the cyclic shift parameter value for the first layer is 10 Applying a second OCC to each of the N layers,
In response to a determination as to whether the cyclic shift parameter indicates one of 000, 001, 010 and 111, the cyclic shift parameter values for the first layer being 0, 6, 3 and 9, respectively, And applies a first OCC or a second OCC to each layer of the plurality of layers. 18. The method of claim 17,
Wherein a cyclic shift parameter value for the N layers is determined based on 3-bit values shown in the following table, and the first layer is? = 0.

A base station (eNodeB) for transmitting a cyclic shift (CS) parameter to a terminal apparatus for generating reference signals for a plurality of layers,
The cyclic shift parameter is 011 or 100, the 011 or 100 represents a first OCC for each of the N layers of the terminal device,
The cyclic shift parameter is 101 or 110, or 101 or 110 represents a second OCC for each of the N layers of the terminal device,
Wherein one of the 000, 001, 010 and 111 is associated with the N layers of the terminal device according to the partitioning scheme, such that the cyclic shift parameter is one of 000, 001, 010 and 111, Representing the mapping of the OCC; And
And transmits the cyclic shift parameter to the terminal device.
Lt; / RTI >
011 represents 4 as a cyclic shift parameter value for the first layer in the N layers,
100 represents 2 as a cyclic shift parameter value for the first layer,
101 denotes 8 as a cyclic shift parameter value for the first layer,
110 denotes 10 as a cyclic shift parameter value for the first layer,
Wherein the cyclic shift parameter is represented by 3 bits, and N is 2 or 4. 20. The method of claim 19,
Wherein the cyclic shift parameter indicates a cyclic shift parameter value for N layers as shown in the following table,
Wherein the first layer is? = 0.

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