KR101772454B1 - Method and apparatus of transmitting sounding reference signal - Google Patents

Abstract

A method for transmitting a sounding reference signal in a wireless mobile communication system, the method comprising: receiving resource operation information including resource allocation information for channel sounding from a base station; And transmitting the sounding reference signal through all or a part of a resource area allocated for transmission of a demodulation reference signal on a physical uplink shared channel (PUSCH) according to the resource operation information

Description

METHOD AND APPARATUS OF TRANSMITTING SOUNDING REFERENCE SIGNAL [0002]

The present invention relates to a method of transmitting a reference signal in a mobile communication system, and more particularly, to a method and apparatus for enhancing resource efficiency in transmitting a sounding reference signal.

Background of the Invention [0002] Wireless communication systems are widely deployed to provide various types of communication services such as voice and data. Generally, a wireless communication system is a multiple access system capable of supporting communication with multiple users by sharing available system resources (bandwidth, transmission power, etc.). Examples of multiple access systems include a code division multiple access (CDMA) system, a frequency division multiple access (FDMA) system, a time division multiple access (TDMA) system, an orthogonal frequency division multiple access (OFDMA) system, a single carrier frequency division multiple access (MC-FDMA) system, and a multi-carrier frequency division multiple access (MC-FDMA) system. In a wireless communication system, a terminal can receive information from a base station through a downlink (DL), and a terminal can transmit information to a base station through an uplink (UL). The information transmitted or received by the terminal includes data and various control information, and various physical channels exist depending on the type and use of information transmitted or received by the terminal.

In the wireless mobile communication system, since the channel between the transmitting end and the receiving end is not fixed, it is necessary to measure the channel between the transmitting antenna and the receiving antenna from time to time. When a promised signal is exchanged to measure the channel, the amplitude reduction amount and the phase shift value by the channel can be grasped, and the information thus obtained can be fed back to the transmitting side. Alternatively, unexpected data information can be reliably detected and decoded using such information. The signal promised during the transmission / reception period may be referred to as a reference signal, a pilot signal, or a sounding reference signal.

As an example of a mobile communication system to which the present invention can be applied, a 3GPP LTE (Third Generation Partnership Project) Long Term Evolution (LTE) communication system will be schematically described.

1 is a diagram schematically illustrating an E-UMTS network structure as an example of a mobile communication system. The Evolved Universal Mobile Telecommunications System (E-UMTS) system evolved from the existing Universal Mobile Telecommunications System (UMTS), and is currently undergoing basic standardization work in 3GPP. In general, E-UMTS may be referred to as an LTE (Long Term Evolution) system. For details of the technical specifications of UMTS and E-UMTS, refer to Release 7 and Release 8 of "3rd Generation Partnership Project (Technical Specification Group Radio Access Network)" respectively.

1, an E-UMTS is located at the end of a user equipment (UE) 120, an eNode B (eNode B) 110a and 110b, and a network (E-UTRAN) And an access gateway (AG). The base station may simultaneously transmit multiple data streams for broadcast services, multicast services, and / or unicast services.

One base station has more than one cell. The cell is set to one of the bandwidths of 1.25, 2.5, 5, 10, 15, 20Mhz and the like to provide downlink or uplink transmission service to a plurality of UEs. Different cells may be set up to provide different bandwidths. The base station controls data transmission / reception for a plurality of terminals. The base station transmits downlink scheduling information to downlink (DL) data, and transmits the downlink scheduling information to the corresponding terminal in a time / frequency region, a coding, a data size, a Hybrid Automatic Repeat and ReQuest (HARQ) Information. Also, the base station transmits uplink scheduling information to uplink (UL) data to the corresponding mobile station to notify the time / frequency region, coding, data size, and hybrid automatic retransmission request related information that the mobile station can use. An interface for transmitting user traffic or control traffic may be used between the base stations. The Core Network (CN) can be composed of an AG and a network node for user registration of the UE. The AG manages the mobility of the terminal in units of TA (Tracking Area) composed of a plurality of cells.

Wireless communication technologies have been developed to LTE based on WCDMA, but the demands and expectations of users and operators are continuously increasing. In addition, since other wireless access technologies are continuously being developed, new technology evolution is required to be competitive in the future. Cost reduction per bit, increased service availability, use of flexible frequency band, simple structure and open interface, and proper power consumption of terminal.

Recently, 3GPP has been working on standardization of follow-up technology for LTE. This technique is referred to herein as "LTE-Advanced" or "LTE-A ". One of the main differences between LTE systems and LTE-A systems is the difference in system bandwidth. The LTE-A system aims to support broadband up to 100 MHz, using carrier aggregation or bandwidth aggregation techniques to achieve wideband using multiple frequency blocks. . Carrier aggregation allows a plurality of frequency blocks to be used as one large logical frequency band in order to use a wider frequency band. The bandwidth of each frequency block may be defined based on the bandwidth of the system block used in the LTE system. Each frequency block is transmitted using a component carrier.

It is an object of the present invention to provide a method for effectively transmitting a sounding reference signal in a wireless communication system.

Another object of the present invention is to provide a method for performing efficient resource management by using a demodulation-reference signal (DM-RS) resource used in a wireless communication system for sounding reference signal transmission.

It is still another object of the present invention to provide a method of operating a resource so that a sounding reference signal can be efficiently transmitted even when the number of antennas is added in a wireless communication system.

It is to be understood that both the foregoing general description and the following detailed description are exemplary and explanatory and are not restrictive of the invention, unless further departing from the spirit and scope of the invention as defined by the appended claims. It will be possible.

According to an aspect of the present invention, there is provided a method for transmitting a sounding reference signal in a wireless mobile communication system, the method comprising: receiving resource allocation information for channel sounding from a base station; Receiving resource management information including the resource management information; And selectively transmitting a demodulation reference signal or a sounding reference signal through all or a part of a resource region allocated for demodulation reference signal transmission in a subframe including a plurality of SC-FDMA symbols according to the resource operation information .

According to another aspect of the present invention, there is provided a method for transmitting a sounding reference signal, the method including receiving instruction information indicating whether a sounding reference signal is to be transmitted from the base station, And generate and transmit the sounding reference signal.

In this case, the sounding reference signal indication information may further include information on a demodulation reference signal used for transmitting the sounding reference signal.

The resource allocation information for channel sounding according to an embodiment of the present invention may include information on a resource area for transmission of the demodulation reference signal.

Depending on whether the resource operation information includes resource allocation information for data transmission, the UE according to an exemplary embodiment of the present invention can selectively transmit uplink data when transmitting the sounding reference signal.

According to another aspect of the present invention, there is provided a method for performing channel sounding in a BS according to another embodiment of the present invention includes scheduling an available resource region of a system, including resource allocation for channel sounding step; Transmitting resource operation information according to the resource area scheduling step to a terminal; And receiving a demodulation reference signal or a sounding reference signal from the terminal through all or a part of a resource region allocated for demodulation reference signal transmission in a subframe including a plurality of SC-FDMA symbols according to the resource operation information .

The channel sounding method according to an embodiment of the present invention may further include transmitting indication information indicating whether or not to transmit a sounding reference signal to the mobile station, It is possible to instruct the transmission of the demodulation reference signal or the sounding reference signal in the resource area allocated for the transmission.

In this case, the sounding reference signal indication information may further include information on a demodulation reference signal used for transmitting the sounding reference signal.

According to an embodiment of the present invention, in the step of scheduling the resource area, the base station may multiplex and schedule a resource area allocated for transmission of two or more demodulation reference signals to the resource area for channel sounding.

Alternatively, in the step of scheduling the resource area according to an embodiment of the present invention, the base station may selectively allocate a resource area for data transmission.

The channel sounding method according to an embodiment of the present invention may further include channel sounding for the sounding reference signal received from the terminal.

According to another aspect of the present invention, there is provided a wireless mobile communication system including a receiving module for receiving a wireless signal; A transmission module for transmitting a radio signal; And at least one sounding reference signal on a Physical Uplink Shared Channel (PUSCH) according to resource operation information including resource allocation information for channel sounding received through the reception module, And the processor is further configured to determine whether the resource area allocated for transmitting the demodulation reference signal is entirely or partially a part of the resource area allocated for transmission of the demodulation reference signal according to the resource operation information and the sounding reference signal transmission indication information received via the reception module To transmit the sounding reference signal.

According to another aspect of the present invention, there is provided a base station in a wireless mobile communication system including: a receiving module for receiving a radio signal; A transmission module for transmitting a radio signal; And a processor for scheduling an available resource area of the system including resource allocation for channel sounding, generating resource operation information according to the resource area scheduling, and transmitting the generated resource operation information to the terminal through the transmission module, Scheduling the resource allocation region for channel sounding to include all or part of a resource region allocated for transmission of a demodulation reference signal on a physical uplink shared channel (PUSCH) And perform channel sounding on the sounding reference signal received from the terminal.

It is to be understood that both the foregoing general description and the following detailed description of the present invention are exemplary and explanatory and are intended to provide further explanation of the present invention by those skilled in the art. And can be understood and understood.

According to embodiments of the present invention, various control information can be efficiently transmitted in a wireless communication system.

Also, according to embodiments of the present invention, a demodulation-reference signal (DM-RS) resource is used for transmitting a sounding reference signal, so that even a terminal having a plurality of antennas can transmit a sounding reference signal Can be efficiently transmitted.

It is to be understood that both the foregoing general description and the following detailed description are exemplary and explanatory and are not restrictive of the invention, unless further departing from the spirit and scope of the invention as defined by the appended claims. It will be possible.

BRIEF DESCRIPTION OF THE DRAWINGS The accompanying drawings, which are included to provide a further understanding of the invention and are incorporated in and constitute a part of the specification, illustrate embodiments of the invention and, together with the description, serve to explain the principles of the invention.
1 is a diagram schematically illustrating an E-UMTS network structure as an example of a mobile communication system.
2 is a diagram illustrating a structure of a radio frame used in 3GPP LTE.
3 is a diagram illustrating a physical channel in a 3GPP LTE system and signal transmission using the same.
4 is a diagram showing a structure of a downlink sub-frame.
5 is a diagram illustrating a downlink time-frequency resource grid structure used in a 3GPP LTE system.
6 is a diagram showing a structure of an uplink sub-frame.
7 is a diagram illustrating an example of a radio frame structure in an uplink used in the 3GPP LTE system related to the present invention.
8 is a diagram illustrating an example of a sounding reference signal transmission process according to an embodiment of the present invention.
9 is a diagram illustrating an example of a resource region in which resource allocation is performed for channel sounding according to an embodiment of the present invention.
10 is a diagram illustrating another example of a resource area in which resource allocation is performed for channel sounding according to an embodiment of the present invention.
11 is a diagram illustrating another example of a resource area in which resource allocation is performed for channel sounding according to an embodiment of the present invention.
12 is a block diagram illustrating a base station and a terminal in which embodiments of the present invention can be performed.

Hereinafter, preferred embodiments according to the present invention will be described in detail with reference to the accompanying drawings. DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS The following detailed description, together with the accompanying drawings, is intended to illustrate exemplary embodiments of the invention and is not intended to represent the only embodiments in which the invention may be practiced. The following detailed description includes specific details in order to provide a thorough understanding of the present invention. However, those skilled in the art will appreciate that the present invention may be practiced without these specific details. For example, the following detailed description is based on the assumption that the mobile communication system is a 3GPP LTE system, but it is applicable to any other mobile communication system except for the specific aspects of 3GPP LTE.

In some instances, well-known structures and devices may be omitted or may be shown in block diagram form, centering on the core functionality of each structure and device, to avoid obscuring the concepts of the present invention. In the following description, the same components are denoted by the same reference numerals throughout the specification.

In the following description, it is assumed that the UE collectively refers to a mobile stationary or stationary user equipment such as a UE (User Equipment), an MS (Mobile Station), and an AMS (Advanced Mobile Station). It is also assumed that the base station collectively refers to any node at a network end that communicates with a terminal such as a Node B, an eNode B, a base station, and an access point (AP).

The following description is to be understood as illustrative and non-limiting, such as code division multiple access (CDMA), frequency division multiple access (FDMA), time division multiple access (TDMA), orthogonal frequency division multiple access (OFDMA), single carrier frequency division multiple access And can be used in various wireless access systems. CDMA may be implemented in radio technology such as Universal Terrestrial Radio Access (UTRA) or CDMA2000. The TDMA may be implemented in a wireless technology such as Global System for Mobile communications (GSM) / General Packet Radio Service (GPRS) / Enhanced Data Rates for GSM Evolution (EDGE). OFDMA may be implemented in wireless technologies such as IEEE 802.11 (Wi-Fi), IEEE 802.16 (WiMAX), IEEE 802-20, and Evolved UTRA (E-UTRA). UTRA is part of the Universal Mobile Telecommunications System (UMTS). 3GPP (3rd Generation Partnership Project) LTE (Long Term Evolution) is a part of E-UMTS (Evolved UMTS) using E-UTRA, adopting OFDMA in downlink and SC-FDMA in uplink. LTE-A (Advanced) is the evolution of 3GPP LTE.

For clarity of description, 3GPP LTE / LTE-A is mainly described, but the technical idea of the present invention is not limited thereto.

In a mobile communication system, a user equipment can receive information through a downlink from a base station, and the terminal can also transmit information through an uplink. The information transmitted or received by the terminal includes data and various control information, and various physical channels exist depending on the type of information transmitted or received by the terminal.

2 illustrates a structure of a radio frame used in LTE.

Referring to FIG. 2, the radio frame has a length of 10 ms (327200 * T _s ) and includes 10 equal-sized subframes. Each subframe has a length of 1 ms and includes two 0.5 ms slots. T _s represents the sampling time and T _s = 1 / (15 kHz * 2048) = 3.2552 * 0 ^-8 (about 33 ns). A slot includes a plurality of Orthogonal Frequency Division Multiplexing (OFDM) symbols in the time domain and a plurality of Resource Blocks (RBs) in the frequency domain. In an LTE system, one resource block includes 12 subcarriers * 7 (6) OFDM (or SC-FDMA) symbols. Frame structure types 1 and 2 are used for FDD and TDD, respectively. Frame structure type 2 includes two half-frames, each half-frame includes five sub-frames, a downlink piloting time slot (DwPTS), a guard period (GP) , And an uplink Piloting Time Slot (UpPTS). The structure of the above-described radio frame is merely an example, and the number / length of subframe, slot, or OFDM (or SC-FDMA) symbols can be variously changed.

3 is a view for explaining a physical channel used in a 3GPP system and a general signal transmission method using the same.

Referring to FIG. 3, when the terminal is powered on or newly enters a cell, the terminal performs an initial cell search operation such as synchronizing with the base station (S310). To this end, the terminal receives a primary synchronization channel (P-SCH) and a secondary synchronization channel (S-SCH) from a base station and synchronizes with the base station and acquires information such as a cell ID have. Then, the terminal can receive the physical broadcast channel from the base station and acquire the in-cell broadcast information. Meanwhile, the UE can receive the downlink reference signal in the initial cell search step and check the downlink channel status.

Upon completion of the initial cell search, the UE receives more detailed system information by receiving a physical downlink control channel (PDCCH) and a physical downlink control channel (PDSCH) according to the information on the PDCCH (S320).

Meanwhile, if there is no radio resource for signal connection or the first access to the base station, the terminal may perform a random access procedure (RACH) on the base station (steps S330 to S360). To this end, the UE transmits a specific sequence through a Physical Random Access Channel (PRACH) (S330 and S350) and receives a response message for the preamble on the PDCCH and the corresponding PDSCH S340 and S360). In case of the contention-based RACH, a contention resolution procedure can be additionally performed.

The MS performs the PDCCH / PDSCH reception (S370) and the physical uplink shared channel (PUSCH) / physical uplink control channel Control Channel, PUCCH) (S380). The control information transmitted by the UE to the Node B via the uplink or received from the Node B by the UE includes a downlink / uplink ACK / NACK signal, a channel quality indicator (CQI), a precoding matrix index (PMI), a rank indicator . In the case of the 3GPP LTE system, the UE can transmit control information such as CQI / PMI / RI as described above through PUSCH and / or PUCCH.

4 is a diagram illustrating a structure of a downlink sub-frame.

Referring to FIG. 4, one subframe includes two slots in the time domain. A maximum of 3 OFDM symbols preceding a first slot in a subframe are control regions to which control channels are allocated, and the remaining OFDM symbols are data regions to which a physical downlink shared channel (PDSCH) is allocated.

The downlink control channels used in the 3GPP LTE are a Physical Control Format Indicator Channel (PCFICH), a Physical Downlink Control Channel (PDCCH), and a Physical Hybrid-ARQ Indicator Channel (PHICH). The PCFICH transmitted in the first OFDM symbol of the subframe carries information on the number of OFDM symbols (i.e., the size of the control region) used for transmission of the control channels in the subframe. The control information transmitted through the PDCCH is referred to as downlink control information (DCI). DCI indicates uplink resource allocation information, downlink resource allocation information, and uplink transmission power control commands for arbitrary terminal groups. The PHICH carries an ACK (Acknowledgment) / NACK (Not-Acknowledgment) signal for an uplink HARQ (Hybrid Automatic Repeat Request). That is, the ACK / NACK signal for the uplink data transmitted by the UE is transmitted on the PHICH.

Now, the downlink physical channel PDCCH will be described.

The PDCCH includes a resource allocation and transmission format (referred to as a downlink grant) of the PDSCH, resource allocation information of the PUSCH (also referred to as an uplink grant), transmission power control commands for individual terminals in an arbitrary terminal group Aggregation and activation of Voice over Internet Protocol (VoIP). A plurality of PDCCHs can be transmitted in the control domain, and the UE can monitor a plurality of PDCCHs. The PDCCH consists of one or several consecutive aggregation of control channel elements (CCEs). A PDCCH composed of a set of one or several consecutive CCEs can be transmitted through the control domain after subblock interleaving. The CCE is a logical allocation unit used to provide the PDCCH with the coding rate according to the state of the radio channel. The CCE corresponds to a plurality of resource element groups. The format of the PDCCH and the number of bits of the possible PDCCH are determined according to the relationship between the number of CCEs and the coding rate provided by the CCEs.

The control information transmitted through the PDCCH is referred to as downlink control information (DCI). Table 1 below shows the DCI according to the DCI format.

DCI format 0 indicates uplink resource allocation information, DCI formats 1 and 2 indicate downlink resource allocation information, and DCI formats 3 and 3A indicate uplink TPC (transmit power control) commands for arbitrary terminal groups .

5 is a diagram illustrating a downlink time-frequency resource grid structure used in a 3GPP LTE system, which is an example of a mobile communication system.

*

개의 부반송파(subcarrier)와

개의 OFDM 심볼로 구성되는 도 1과 같은 자원 격자(resource grid)에 의해 묘사될 수 있다. 여기서,

은 하향링크에서의 자원 블록(Resource Block; RB)의 개수를 나타내고,

는 하나의 RB을 구성하는 서브캐리어의 개수를 나타내고,

는 하나의 하향링크 슬롯에서의 OFDM 심볼의 개수를 나타낸다.

의 크기는 셀 내에서 구성된 하향링크 전송 대역폭에 따라 달라지며

을 만족해야 한다. 여기서,

는 무선 통신 시스템이 지원하는 가장 작은 하향링크 대역폭이며

는 무선 통신 시스템이 지원하는 가장 큰 하향링크 대역폭이다.

이고

일 수 있지만, 이에 한정되는 것은 아니다. 하나의 슬롯 내에 포함된 OFDM 심볼의 개수는 순환 전치(Cyclic Prefix, CP)의 길이 및 부반송파의 간격에 따라 다를 수 있다. 다중안테나 전송의 경우에, 하나의 안테나 포트 당 하나의 자원 격자가 정의될 수 있다.Referring to FIG. 5, a downlink signal transmitted in each slot is

*

Subcarriers < RTI ID = 0.0 >

And can be described by a resource grid as shown in FIG. 1, which is composed of OFDM symbols. here,

Represents the number of resource blocks (RBs) in the downlink,

Denotes the number of subcarriers constituting one RB,

Represents the number of OFDM symbols in one downlink slot.

Depends on the downlink transmission bandwidth configured in the cell

. here,

Is the smallest downlink bandwidth supported by the wireless communication system

Is the largest downlink bandwidth supported by the wireless communication system.

ego

But is not limited thereto. The number of OFDM symbols included in one slot may be different depending on the length of a cyclic prefix (CP) and the interval of subcarriers. In the case of multiple antenna transmissions, one resource grid per antenna port may be defined.

에 의해 유일하게 식별된다. 여기서,

는 주파수 영역에서의 인덱스이고

는 시간 영역에서의 인덱스이며

는

중 어느 하나의 값을 갖고,

는

중 어느 하나의 값을 갖는다. Each element in the resource grid for each antenna port is called a Resource Element (RE), and an index pair

≪ / RTI > here,

Is an index in the frequency domain

Is the index in the time domain

The

And has a value of "

The

Or the like.

A resource block (RB) shown in FIG. 5 is used to describe a mapping relationship between certain physical channels and resource elements. The RB can be divided into a physical resource block (PRB) and a virtual resource block (VRB).

개의 연속적인 OFDM 심볼과 주파수 영역의

개의 연속적인 부반송파로 정의된다. 여기서

과

는 미리 결정된 값일 수 있다. 예를 들어

과

는 표 1과 같이 주어질 수 있다. 따라서 하나의 PRB는

개의 자원 요소로 구성된다. 하나의 PRB는 시간 영역에서는 하나의 슬롯에 대응되고 주파수 영역에서는 180kHz에 대응될 수 있지만 이에 한정되는 것은 아니다. The one PRB is a time-

Lt; RTI ID = 0.0 > OFDM < / RTI &

Lt; / RTI > subcarriers. here

and

May be a predetermined value. E.g

and

Can be given as shown in Table 1. Therefore, one PRB

Resource elements. One PRB corresponds to one slot in the time domain and corresponds to 180 kHz in the frequency domain, but is not limited thereto.

Configuration

Normal cyclic prefix

12 7 Extended cyclic prefix

6

24 3

까지의 값을 갖는다. 주파수 영역에서의 PRB 넘버(number)

와 하나의 슬롯 내에서의 자원 요소

사이의 관계는

를 만족한다.In the frequency domain,

Lt; / RTI > The PRB number in the frequency domain

And resource elements in one slot

The relationship between

.

가 함께 할당된다. The size of the VRB is equal to the size of the PRB. The VRB can be defined by dividing into a localized VRB (Localized VRB) and a distributed VRB (Distributed VRB). For each type of VRB, a pair of VRBs in two slots in one subframe is assigned a single VRB number

Are assigned together.

개의 VRB들은 각각 0부터

중 어느 하나의 인덱스 (Index)를 할당 받고, 위의 2개의 슬롯 중 제2 슬롯에 속하는

개의 VRB들도 마찬가지로 각각 0부터

중 어느 하나의 인덱스를 할당 받는다.The VRB may have the same size as the PRB. Two types of VRBs are defined. The first type is Localized VRB (LVRB), and the second type is Distributed VRB (DVRB). For each type of VRB, a pair of VRBs is assigned over two slots in one subframe with a single VRB index (which may be referred to as a VRB number hereinafter). In other words, the subframe belonging to the first one of the two slots constituting one subframe

The number of VRBs is 0

(Index) is assigned to any one of the above two slots,

The number of VRBs is also 0

Quot; index "

6 illustrates a structure of an uplink subframe used in LTE.

Referring to FIG. 6, the uplink subframe includes a plurality of slots (for example, two slots). The uplink sub-frame is divided into a data area and a control area in the frequency domain. The data area includes an uplink shared channel (PUSCH) and is used for transmitting data signals such as voice and video, and the control area includes an uplink control channel (PUCCH) and is used for transmitting control information. The PUCCH includes an RB pair (RB pair) located at both ends of the data area on the frequency axis and hopping the slot to the boundary. The control information includes Hybrid Automatic Retransmission Request (HARQ) ACK / NACK, and downlink channel information (hereinafter referred to as downlink channel information or channel information). The downlink channel information includes CQI, PMI, RI, and the like. The BS determines appropriate time / frequency resources, a modulation method, a coding rate, and the like for data transmission to each MS using downlink channel information received from each MS.

In the LTE system, the channel information includes CQI, PMI, and RI. Depending on the transmission mode of each terminal, CQI, PMI, and RI are all transmitted or only a part of the CQI is transmitted. Periodic reporting of channel information is referred to as periodic reporting, and occasional reporting of channel information at the request of a base station is referred to as aperiodic reporting. In the case of aperiodic reporting, a request bit included in uplink scheduling information provided by the base station is transmitted to the UE. Thereafter, the MS transmits channel information considering its own transmission mode to the BS through the uplink data channel (PUSCH). In the case of periodic reporting, a period and an offset in a corresponding period are signaled on a sub-frame basis in a semi-static manner through an upper layer signal for each terminal. Each terminal transmits channel information considering a transmission mode to a base station through an uplink control channel (PUCCH) according to a predetermined period. If uplink data exists in a subframe transmitting channel information at the same time, the channel information is transmitted on the uplink data channel (PUSCH) together with the data. The BS transmits transmission timing information suitable for each MS to the MS in consideration of the channel status of each MS and the distribution of UEs in the cell. The transmission timing information includes a period for transmitting channel information, an offset, and the like, and may be transmitted to each mobile station through a radio resource control (RRC) message.

In general, an LTE-A system can utilize new network components, such as a larger number of antennas and relays, as compared to existing LTE systems. An LTE-A system with these new components should be able to support connectivity to LTE-A terminals while at the same time maintaining the performance of legacy systems such as existing LTE systems.

Among them, a sounding reference signal can be used as a signal that can be used by the base station to estimate the channel state from each terminal to the base station.

The sounding reference signal is a reference signal used for uplink channel measurement, and is a pilot signal transmitted from each terminal to the base station, and is used by the base station to estimate the channel state from each terminal to the base station. A channel for transmitting a sounding reference signal (hereinafter referred to as a channel sounding channel) may have a different transmission bandwidth and a transmission period for each terminal according to each terminal state.

Based on the channel estimation result, the base station can determine which UE's data channel to schedule in each subframe.

Herein, the sounding reference signal may be used in the same sense as a channel sounding signal or a sounding signal.

7 is a diagram illustrating an example of a radio frame structure in an uplink used in a 3GPP LTE system in general.

Referring to FIG. 7, in the 3GPP LTE system, a demodulation-reference signal (DM-RS) is transmitted through two transmission symbols (e.g., OFDM symbol or SC-FDMA symbol) Lt; RTI ID = 0.0 > a < / RTI > transmission symbol. For example, in a frame structure transmitted on a PUSCH, a DM-RS is mapped to fourth and eleventh OFDM symbols or SC-FDMA symbols in a case of a normal cyclic prefix (normal CP) Symbol or an SC-FDMA symbol by mapping a sounding reference signal.

In the radio frame structure as shown in FIG. 7, resources for channel sounding are given for uplink channel measurement based on one antenna included in the UE.

However, in this case, if the number of transmission antennas is increased in the LTE-A system or more sounding signals are to be transmitted, but the root sequence, which is one of the sounding resources, does not increase, more sounding reference signals are transmitted There arises a problem that the resource space becomes insufficient below. In particular, if the time of the relay-cell uplink sub-frame and the time of the relay-uplink backhaul sub-frame are the same, a problem may occur in the sounding reference signal transmission.

Therefore, considering a sounding reference signal located in the last OFDM symbol or SC-FDMA symbol, a new sounding method needs to be defined. For example, in the case of a repeater system, the sounding reference signal to be transmitted increases, so that the number of channel sounding channels defined accordingly also needs to be increased. On the other hand, in case of LTE-A terminal, the sounding reference signal must be shared by multiple transmission antennas, and accordingly, the LTE-A system requires a long time until complicated channel measurement is completed or an uplink user capacity It can become scarce.

Therefore, the method of transmitting a sounding reference signal according to an embodiment of the present invention is a method of performing new channel sounding for transmitting a sounding reference signal for a single transmit antenna and a plurality of transmit antennas in an LTE-A system, We propose a method for constructing and mapping resources.

One. First Embodiment ( DM - RS Channel using Sounding )

8 is a diagram illustrating an example of a sounding reference signal transmission process according to an embodiment of the present invention.

Referring to FIG. 8, the base station can perform various resource allocation scheduling for channel sounding (S801). In the case where it is necessary to allocate a resource to which a sounding reference signal is to be transmitted in addition to a resource allocation for a conventional channel sounding, the BS performs resource allocation scheduling for channel sounding together with data transmission, Or to schedule a resource allocation to utilize a different data transmission channel. Resource allocation scheduling for channel sounding will be briefly described in the following embodiments.

Then, the base station transmits the resource operation information according to the resource allocation scheduling to the mobile station (S802). The resource operation information may include resource allocation information for channel sounding and / or resource allocation information for data transmission.

In this case, when resource allocation scheduling is performed to perform channel sounding using resources for DM-RS according to an embodiment of the present invention, whether to transmit a sounding reference signal through the assigned DM-RS resource region (S803) through the resource management information or through separate signaling. For example, if one bit is assigned to the sounding reference signal indicator, setting the bit value to '1' may indicate to transmit the sounding reference signal via the allocated DM-RS resource. Alternatively, if the sounding reference signal indicator is set to '0', it may be indicated that the UE is instructed to transmit the DM-RS through the DM-RS resource.

Alternatively, if only the resource for the DM-RS is allocated without implicitly allocating the data transmission resource, the UE can transmit only the sounding reference signal using the DM-RS resource without data transmission. Alternatively, when resource allocation scheduling is performed to perform channel sounding through a data channel, it is possible to indicate whether to transmit a sounding reference signal through a resource area allocated through the sounding reference signal indicator.

The MS receiving the resource operation information and the sounding reference signal indicator constructs a corresponding reference signal according to the sounding reference signal indicator in the resource area for the uplink transmission allocated according to the resource operation information in step S804, Through the uplink channel (S805).

Accordingly, the base station can perform channel measurement using the sounding reference signal transmitted from each terminal (S806).

Hereinafter, a method of performing resource allocation scheduling for channel sounding according to an embodiment of the present invention will be described.

(One) 1st Example (channel Sounding  Resource allocation)

The base station according to an embodiment of the present invention can generate a new sounding channel when the number of channel sounding is not sufficient in the process of allocating the uplink resources.

For example, the base station performs channel-dependent scheduling based on channel sounding in the case of data, but performs non-channel related scheduling in which only the necessary bandwidth is allocated to the sounding reference signal for the sounding reference signal You may.

To support sufficient channel sounding bandwidth, resources can be allocated through the overall bandwidth of the system, and the channel sounding results can then be used for subsequent resource allocation. Since resource allocation can be performed dynamically or semi-dynamically, the resource allocation for channel sounding can be determined according to the resource allocation type. For example, in the case of dynamic resource allocation, since the base station can perform scheduling for resource allocation entirely, no additional process is required for resource allocation for the sounding reference signal.

On the other hand, in the case of anti-dynamic resource allocation, the resource allocation rate can be slowly performed and an additional process is required.

For example, the resource area must be predefined so that the distributed resource allocation can be used for channel sounding. In consideration of this, the resource allocation for a terminal or a repeater should be distributed basically, but a distributed resource pattern can be additionally defined when localizing a resource allocation. Alternatively, if a distributed resource pattern is defined, the resource allocation can be localized.

The resource allocation for channel sounding according to an embodiment of the present invention may utilize the entire or partial resource area in a predefined resource area (for example, a previously used resource area). For example, resource allocations for channel sounding may utilize all or part of the resource area allocated for data transmission. In the uplink data transmission, the UE can transmit the demodulation reference signal (DM-RS) for data demodulation together with the data through the PUSCH.

(2) Second Example (Channel according to resource allocation Sounding  Configuration)

The resource allocation for channel sounding according to another embodiment of the present invention uses a resource allocation method for a sounding channel that is generally used, and various parameters may be modified and used.

For example, if the same channel sounding allocation method as the existing one is used as a resource allocation method for an arbitrary sounding channel, an appropriate channel sounding time can be obtained by using a sounding cycle and an offset. In addition, other parameters related to channel sounding can be reused for transmission format assignment or DM-RS assignment. Alternatively, the resource allocation method for a sounding channel according to another embodiment of the present invention may include a radio frame transmission period or a broadcast channel period, DM-RS allocation and use assignment on an allocated DM-RS OFDM symbol or an SC- A new sounding period and a sounding offset value can be derived based on parameters related to resource allocation for a previously used sounding channel such as a method of selecting an available resource in the allocated resource area, .

The configuration parameters for channel sounding according to embodiments of the present invention are set to indirect cell specific and UE specific Radio Resource Control (RRC) parameters based on the configuration scheme of LTE Rel-8 . This configuration may be implemented with implicit or direct higher layer signaling in an anti-static manner or with L1 / L2 signaling in a dynamic manner.

The appropriate sounding reference signal configuration is then set by L1 / L2 control signaling (e.g., a UE-specific PDCCH Downlink Control Information (DCI) format for UL grant or designated signaling for channel sounding) .

(3)  Third Embodiment ( DM - RS  Channel through resources Sounding )

As shown in the radio frame structure of FIG. 6, the resource allocation for channel sounding according to an embodiment of the present invention generally includes a resource for transmitting a sounding reference signal to the last OFDM symbol or SC-FDMA symbol of a subframe While additionally using the DM-RS resource area as a resource area for the sounding reference signal.

For this, unlike a conventional resource allocation method in which a BS allocates resources according to channel characteristics, a BS according to an embodiment of the present invention considers whether the number of sounding transmissions increases, Resource allocation scheduling according to the present invention.

The base station may be configured to determine, for a sounding reference signal transmitter (e.g., a terminal) corresponding across a bandwidth for channel sounding, if the symbol required for channel sounding is only a DM-RS OFDM symbol or an SC- Resources for the DM-RS can be allocated, which is illustrated in Fig. 11 which will be described below.

If a plurality of DM-RS resources can be allocated in the same sub-band, the BS transmits sounding reference signals distinguished from different terminals to the same OFDM symbol or SC-FDMA symbol through the same DM-RS subband And scheduling resource allocation for a plurality of terminals so as to be transmitted.

(4) Fourth Embodiment (Numerous DM - RS  Channel through resources Sounding )

According to another embodiment of the present invention, the BS can perform resource allocation scheduling considering a case where a plurality of DM-RSs can exist in an uplink sub-frame. For example, in an LTE system, two DM-RSs can be transmitted through one subframe.

If there are a plurality of DM-RSs in the uplink sub-frame, the base station can multiplex a plurality of DM-RSs so that more channel sounding and power gains can be obtained. For example, in a subframe, a first DM-RS may be used for channel sounding of subband A, and a second DM-RS may be used for channel sounding of subband B. As each DM-RS in a subframe has a free DM-RS resource, such as a sequence, a circular movement, or a scrambling operation, the number of channel soundings using DM-RS resources can be increased.

A method of multiplexing a plurality of UEs and arranging them on DM-RSs can be performed arbitrarily, so that one UE can use a single DM-RS or multiple DM-RSs. At this time, the bands to which the DM-RSs are allocated can be equally applied to power combining, multiple antenna support, or time diversity through a plurality of DM-RSs, and can be classified for flexible scheduling in a slot- have.

Thus, when channel sounding is used via each DM-RS, the sounding signal can be precoded so that the beamforming gain can be achieved and the precoding matrix can be used for other DM-RS OFDM symbols or SC- FDMA symbols Or subbands, respectively.

(5) Fifth Example (channel Sounding  A method for supporting multiple antennas for a mobile terminal

For multiple transmit antenna support, the number of resources required for the DM-RS can be increased linearly if no precoding is used. To support multiple transmit antennas, a base station may allocate multiple available resources on the same DM-RS subbands or on distinct DM-RS subbands in the time and frequency resource regions.

The channel sounding method according to an embodiment of the present invention assigns one or more transmit antennas to a legacy sounding channel to support multiple antennas through DM-RS resources, and the other antennas are allocated for DM-RS resources. The actual transmit antennas may be changed in a transmission trial for the same assignment in the DM-RS and legacy sounding reference signals, respectively.

For example, a sounding resource on a legacy sounding channel can be assigned to a DM-RS sounding resource. Then, the first transmit antenna may use a legacy sounding channel at a time of performing the first channel sounding, and then the same antenna may transmit the DM-RS sounding channel according to a predetermined or predefined antenna rotation or change method It can also be used. In this case, all antennas have similar sounding quality over a certain period of time.

On the other hand, when the precoding for the DM-RS is applied as a reference for the uplink MIMO transmission, the sounding method can use a general DM-RS in which no precoding is performed. Since information about an appropriate precoding vector that has been used previously can be provided.

According to the embodiments of the present invention described above, it is possible to increase the sounding reference signal performance in terms of the total number of channel sounding times and to provide a repeater uplink backhaul serving as a repeater uplink sub- A new sounding position can be provided for the frame.

2. Second Example  ( Sounding  A circular motion composition method for a reference signal)

In the method of using the DM-RS according to the above-described embodiments of the present invention as a sounding reference signal, a method of setting a cyclic shift (CS) as a DM-RS resource for a sounding reference signal .

According to one embodiment of the present invention, a cyclic shift value that is not used as an actual DM-RS resource in the total cyclic shift (e.g., twelve) available for the DM-RS is compared with the DM- It can be used for sounding reference signal transmission method using RS resources.

Currently, the CS resources used in the LTE system are illustrated in Tables 3 and 4.

In DCI format 0, the circular motion field [3 bits] DM-RS index (n ⁽²⁾ _{DM- RS} ) 000 0 001 6 010 3 011 4 100 2 101 8 110 10 111 9

Circular motion DM-RS index (n ⁽¹⁾ _{DM- RS} ) 0 0 One 2 2 3 3 4 4 6 5 8 6 9 7 10

Referring to Tables 3 and 4, among the 12 cyclic shifts, values not used for DM-RS transmission are 1, 5, 7 and 11, and when they are transmitted through DM-RS symbols, It can be configured as a circular movement value.

Such a sounding reference signal related configuration method may be transmitted to the UE through separate signaling for channel sounding through higher layer signaling or L1 / L2 control signaling, or may be included in the UE-specific PDCCH DCI format and transmitted. Alternatively, in the embodiment of the present invention described above with reference to FIG. 8, two bits are allocated to the sounding reference signal indication information transmitted through step S803, and one of four cyclic movements not used for DM-RS transmission is designated . To this end, the DM-RS mapping information and the DM-RS value used for the sounding reference signal transmission as shown in Table 3 and Table 4 are preset in the terminal, or the mapping information is informed to the terminal by separate signaling.

A resource region for transmitting a sounding reference signal through the DM-RS resource according to the above-described embodiment will be described with reference to FIG. 9 to FIG.

9 is a diagram illustrating an example of a resource region in which resource allocation is performed for channel sounding according to an embodiment of the present invention.

One subframe shown in FIG. 9 is composed of two slots. In a certain area of each slot, resources are allocated according to an uplink channel used for signal transmission from a subscriber station to a base station.

At this time, the BS can schedule the same resource allocation size for data transmission and the same bandwidth size for DM-RS transmission. At this time, resources can be operated to perform channel sounding using resources for DM-RS. That is, the BS may perform channel sounding on a reference signal transmitted through the DM-RS resource region from the UE. Here, the present invention is not limited to the data transmission in the resource area allocated for data transmission.

10 is a diagram illustrating another example of a resource area in which resource allocation is performed for channel sounding according to an embodiment of the present invention.

One subframe shown in FIG. 10 is composed of two slots, and resource allocation according to an uplink channel used for signal transmission from a subscriber station to a base station is performed in a certain area of each slot.

In this case, the BS may configure the resource allocation size for data transmission to be equal to the size of the bandwidth for DM-RS in the resource allocation scheduling. At this time, frequency resources remaining in the frequency band for the DM-RS may not be used for data transmission.

11 is a diagram illustrating another example of a resource area in which resource allocation is performed for channel sounding according to an embodiment of the present invention.

Referring to FIG. 11, a BS according to an embodiment of the present invention can allocate only a resource region for DM-RS transmission as a resource allocation for sounding without allocating a resource region for data transmission. That is, the UE can transmit only the sounding reference signal to the BS through the DM-RS resource without transmitting the data.

In the case of a UE, only the sounding reference signal can be transmitted through the DM-RS resource without data transmission. However, in the case of a base station, the UE transmitting only the sounding reference signal through the DM- When frequency resources are partially overlapped between UEs transmitting DM-RS or sounding reference signals through resources for DM-RS, a method for distinguishing two in different domains is required.

Therefore, different orthogonal cover codes such as Walsh code = {[0 0], [0,1]} are applied to each UE to distinguish them, It is possible to set DM-RS separation between UEs in the used DM-RS resource area.

This is because the BS transmits DM-RS or sounding reference signal through the DM-RS resource while transmitting data with the UE transmitting only the sounding reference signal through the DM-RS resource, and allocates the frequency band to overlap A different orthogonal cover code can be applied to the case of the case where the first orthogonal code is used. This should be UE specific information for the UE and may be transmitted in L1 / L2 control information or higher layer signaling, i.e., RRC signaling.

To do this, the base station constructs DM-RS resource allocation information by selecting DM-RS information such as individual sounding bandwidth, candidate cyclic shift, and candidate root sequence. The DM-RS resource allocation information can be transmitted to the corresponding UE before actual channel sounding is performed. This DM-RS resource allocation information may be transmitted in the step S802 of transmitting the resource operation information in the above-described FIG. 8 from upper layer signaling in the anti-dynamic scheme or L1 / L2 signaling in the dynamic scheme.

For example, when using the dynamic DM-RS resource allocation, the base station can know information on the transmission mode in which the subband is used and information on the DM-RS sequence transmitted on the corresponding subband. Based on this, the base station can notify the terminal of the DM-RS resources (sequence, cyclic shift, DM-RS position, etc.) by means of separate signaling that it can be used for channel sounding regardless of the operation of other terminals. Such information may be transmitted together in step S803 of transmitting the sounding reference signal indicator in FIG. 8 or may be transmitted in separate signaling.

3. Third Example (For multiple antennas Sounding  Resource allocation for reference signal)

According to another embodiment of the present invention, an SC-FDMA symbol that can be used for channel sounding in LTE considering only one antenna corresponds to the last symbol in one subframe. The number of symbols of the DM-RS in one subframe is one symbol in each slot, and the number of symbols is two.

In case of transmitting each sounding reference signal in each slot in the same manner as that of the DM-RS according to the above-described embodiments of the present invention, the DM-RS symbol in one slot of one sub- The circulating mobile resource used for the sounding reference signal is twice the resource allocated for the conventional sounding reference signal. As the number of the circulating mobile resources corresponding to one DM-RS symbol increases, the interference level increases, and the performance of channel measurement can be reduced.

Therefore, in order to perform channel sounding for each antenna, a method of transmitting a sounding reference signal using the DM-RS according to the embodiments of the present invention includes a DM- Only RS symbols can be used. This will be described with reference to Table 5 and Table 6. Table 5 and Table 6 show the number of cyclic shifts (CS) of the DM-RS that can correspond to a slot belonging to one subframe for each antenna.

Slot 0 Slot 1 The first antenna CS #m - The second antenna - CS #m Third antenna CS #n - Fourth antenna - CS #n

Slot 0 Slot 1 The first antenna - CS #m The second antenna CS #m - Third antenna - CS #n Fourth antenna CS #n -

In Table 5 and Table 6, m and n, which represent the values of the cyclic shift, can have any one of {0,1,2,3, ..., 11} and are used as DM-RS resources You can use {1,5,7,11}, which is not a circular movement value. Alternatively, when a cyclic shift value to be used for the DM-RS is set in the base station, the DM-RS value that can be used for channel sounding may be changed. In addition, the indexing of the antennas that allocate cyclic movements may also be interchanged. For example, in Table 5, the circular movement to be allocated to the first antenna may be composed of CS #n instead of CS #m.

In the case of transmitting a sounding reference signal in each slot in the same manner as the method of transmitting DM-RS according to an embodiment of the present invention, each sounding reference signal is transmitted in each slot belonging to one sub- A method of not increasing the mobile resources can be used. For example, an Orthogonal Cover Code (OCC) may be applied to a resource for a sounding reference signal. This will be described with reference to Table 5 and Table 6.

Slot 0 Slot 1 OCC index The first antenna CS #m CS #m 0 The second antenna CS #n CS #n One Third antenna CS #m CS #m 0 Fourth antenna CS #n CS #n One

Slot 0 Slot 1 OCC index The first antenna CS #m CS #m 0 The second antenna CS #n CS #n 0 Third antenna CS #m CS #m One Fourth antenna CS #n CS #n One

If the channel change between two slots in one subframe is not large, the accuracy of the channel measurement due to the averaging of the sounding reference signal between the two slots can be increased.

Here, m or n may correspond to any one of {0, 1, 2, 3, ..., 11}, and a cyclic shift value not used as a DM-RS resource as described in the present invention is m Or as an n value. Alternatively, a method may be considered in which only the cyclic shift values 1, 5, 7, 11 that are not used for cyclic movement of DM-RS as m or n values are used.

The indexing of the antennas for allocating the circular movement corresponding to each slot may also be changed. For example, in Table 5, the cyclic shift corresponding to slot 0 and slot 1 in the first antenna may be changed to CS #n instead of CS #m.

The base station and the terminal capable of performing the embodiments of the present invention will be described with reference to FIG.

12 is a block diagram illustrating a base station and a terminal in which embodiments of the present invention can be performed.

The terminal can operate as a transmitting apparatus in the uplink and as a receiving apparatus in the downlink. In addition, the base station may operate as a receiving apparatus in an uplink and operate as a transmitting apparatus in a downlink. That is, the terminal and the base station may include a transmitting apparatus and a receiving apparatus for transmitting information or data.

The transmitting apparatus and the receiving apparatus may include a processor, a module, a part and / or a means for performing embodiments of the present invention. In particular, the transmitting apparatus and the receiving apparatus may include a module (means) for encrypting a message, a module for interpreting an encrypted message, an antenna for transmitting and receiving a message, and the like.

Referring to FIG. 12, the left side shows a base station in the structure of a transmitting apparatus, and the right side shows a terminal that enters a cell served by a base station in the structure of a receiving apparatus. The transmitting apparatus and the receiving apparatus may include antennas 1201 and 1202, receiving modules 1210 and 1220, processors 1230 and 1240, transmitting modules 1250 and 1260, and memories 1270 and 1280.

The antennas 1201 and 1202 include a reception antenna for receiving a radio signal from the outside and transmitting the radio signal to the reception modules 1210 and 1220 and a transmission antenna for transmitting signals generated by the transmission modules 1250 and 1260 to the outside . The antennas 1201 and 1202 may be provided with two or more antennas when a multi-antenna (MIMO) function is supported.

The receiving modules 1210 and 1220 can decode and demodulate the radio signal received from the outside through the antenna and restore the original data to the processors 1230 and 1240. The receiving module and the antenna may be represented as a receiving unit for receiving a radio signal without separating as shown in FIG.

Processors 1230 and 1240 typically control the overall operation of a transmitting or receiving device. In particular, a controller function, a service characteristic, and a MAC (Medium Access Control) frame variable control function, a handover function, an authentication and encryption function, and the like are performed to perform the embodiments of the present invention .

Transmission modules 1250 and 1260 may perform predetermined coding and modulation on data to be transmitted from the processors 1230 and 1240 and then transmit the data to the antennas. The transmission module and the antenna may be represented as a transmission unit for transmitting a radio signal without separation as shown in FIG.

The memories 1270 and 1280 may store programs for processing and controlling the processors 1230 and 1240 and may store input / output data (UL grant, System information, a station identifier (STID), a flow identifier (FID), an operation time, and the like.

The memories 1270 and 1280 may be a flash memory type, a hard-disk type, a multimedia card micro type, a card type memory (e.g., SD XD memory, etc.), a random access memory (RAM), a static random access memory (SRAM), a read-only memory (ROM), an electrically erasable programmable read-only memory (EEPROM), a programmable read- ), A magnetic memory, a magnetic disk, and / or an optical disk.

The processor 1230 of the transmitter performs an overall control operation on the base station. In the resource allocation scheduling according to the embodiment of the present invention described above with reference to FIG. 8, the resource allocation region for channel sounding is a physical uplink shared channel The scheduling may include all or some of the allocated resource areas for transmission of demodulation reference signals on a physical uplink shared channel (PUSCH).

The resource allocation scheduling method for channel sounding can be variously implemented according to 1) to 5) as described above, and the resource operation information related thereto can be transmitted to the reception apparatus through the transmission module 1250. For example, a resource region for channel sounding may be multiplexed with a resource region allocated for transmission of two or more demodulation reference signals, or may be scheduled to selectively allocate a resource region for data transmission.

The processor 1230 may generate indication information indicating whether to transmit the sounding reference signal through the DM-RS resource, and transmit the generated indication information to the receiving device through the transmitting module 1250. The instruction information may instruct the terminal to transmit a demodulation reference signal or a sounding reference signal in a resource region allocated for the demodulation reference signal.

In addition, the processor 1230 of the transmitter can then perform channel measurements using the sounding reference signal transmitted from the receiver.

The processor 1240 of the receiving apparatus performs an overall control operation of the terminal. In addition, according to the embodiments of the present invention described above, a sounding reference signal for performing channel sounding based on the resource operation information received from the transmitting apparatus through the receiving module 1220 can be transmitted to the DM- To the resource area for transmission.

At this time, the processor 1240 may transmit one or more sounding reference signals on the Physical Uplink Shared Channel (PUSCH) according to the resource operation information through the transmission module.

The processor 1240 may also be configured to generate and transmit the demodulation reference signal or the sounding reference signal according to the instruction information received through the reception module 1240 or to transmit the resource operation information to a resource region It is possible to selectively transmit uplink data when transmitting the sounding reference signal according to whether or not allocation information is included.

The processors 1230 and 1240 can be configured to transmit the respective control information described above in the embodiments of the present invention through separate signaling rather than DM-RS. Meanwhile, the base station includes a controller for performing the above-described embodiments of the present invention, orthogonal frequency division multiple access (OFDMA) packet scheduling, time division duplex (RTP) packet scheduling and channel multiplexing, Handover function, authentication and encryption function, packet modulation / demodulation function for data transmission, high-speed packet channel coding function, and real-time modem control function according to characteristics and propagation environment, A module or a part for performing the function or performing the function through at least one of the modules described above.

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS The foregoing description of the preferred embodiments of the invention disclosed herein has been presented to enable any person skilled in the art to make and use the present invention. While the present invention has been particularly shown and described with reference to preferred embodiments thereof, it will be understood by those skilled in the art that various changes and modifications may be made therein without departing from the spirit and scope of the invention as defined by the appended claims. For example, those skilled in the art can utilize each of the configurations described in the above-described embodiments in a manner of mutually combining them.

Accordingly, the present invention is not intended to be limited to the embodiments shown herein but is to be accorded the widest scope consistent with the principles and novel features disclosed herein.

Claims (19)

A method for transmitting a sounding reference signal in a wireless mobile communication system,
Receiving resource operation information including resource allocation information for channel sounding from a base station; And
A plurality of antennas are used in all or a part of a resource area allocated for demodulation reference signal transmission in a subframe including a plurality of single carrier-frequency division multiple access (SC-FDMA) symbols according to the resource operation information And transmitting a sounding reference signal,
The resource region for transmission of the sounding reference signal is a resource region added to the last SC-FDMA symbol in the subframe,
The resource allocation information for channel sounding includes a cyclic shift value and an orthogonal cover code index for the sounding reference signal used in each slot in the subframe for each of the plurality of antennas,
Wherein the cyclic shift value is a value that is not used for the demodulation reference signal. The method according to claim 1,
Further comprising receiving instruction information indicating whether or not to transmit a sounding reference signal from the base station,
And generating and transmitting the demodulation reference signal or the sounding reference signal according to the instruction information. 3. The method of claim 2,
Wherein the sounding reference signal indication information further includes information on a symbol allocated for transmission of the demodulation reference signal used for transmitting the sounding reference signal. The method according to claim 1,
Wherein the resource allocation information for channel sounding includes information about a resource area allocated for transmission of the demodulation reference signal. The method according to claim 1,
Depending on whether the resource operation information includes resource area allocation information for data transmission,
Wherein the terminal selectively transmits uplink data when transmitting the sounding reference signal. A method for performing channel sounding in a wireless mobile communication system,
Scheduling an available resource region of the system including resource allocation for channel sounding;
Transmitting resource operation information according to the resource area scheduling step to a terminal; And
A plurality of antennas of the UE through all or a part of resource areas allocated for demodulation reference signal transmission in a subframe including a plurality of single carrier-frequency division multiple access (SC-FDMA) symbols according to the resource operation information; And receiving a sounding reference signal from the terminal that is transmitted using the sounding reference signal,
The resource region for transmission of the sounding reference signal is a resource region added to the last SC-FDMA symbol in the subframe,
The resource allocation information for channel sounding includes a cyclic shift value and an orthogonal cover code index for the sounding reference signal used in each slot in the subframe for each of the plurality of antennas,
Wherein the cyclic shift value is a value that is not used for the demodulation reference signal. The method according to claim 6,
And transmitting indication information indicating whether a sounding reference signal is to be transmitted to the terminal,
Wherein the indication information indicates transmission of a demodulation reference signal or a sounding reference signal in a resource region allocated for the demodulation reference signal at the terminal. 8. The method of claim 7,
Wherein the sounding reference signal indication information further includes information on a symbol allocated for a demodulation reference signal used to transmit the sounding reference signal. The method according to claim 6,
In the step of scheduling the resource area,
Wherein the base station multiplexes and schedules a resource region allocated for transmission of two or more demodulation reference signals to a resource region for the channel sounding. The method according to claim 6,
In the step of scheduling the resource area,
Wherein the base station selectively allocates a resource region for data transmission. The method according to claim 6,
And performing channel sounding on the sounding reference signal received from the terminal. In a wireless mobile communication system,
A receiving module for receiving a wireless signal;
A transmission module for transmitting a radio signal; And
And transmitting at least one sounding reference signal on a Physical Uplink Shared Channel (PUSCH) in a subframe according to resource operation information including resource allocation information for channel sounding received through the reception module, And a processor for performing the method of the present invention,
The processor comprising:
And transmitting the sounding reference signal through all or a part of the resource area allocated for the demodulation reference signal transmission according to the resource operation information and the sounding reference signal transmission indication information received through the reception module.
The PUSCH for transmission of the sounding reference signal is a resource area added to the last SC-FDMA symbol in the subframe,
The resource allocation information for channel sounding includes a cyclic shift value and an orthogonal cover code index for the sounding reference signal used in each slot in the subframe for each of a plurality of antennas,
Wherein the cyclic shift value is a value that is not used for the demodulation reference signal. 13. The method of claim 12,
The processor comprising:
And generates and transmits the demodulation reference signal or the sounding reference signal according to the instruction information received through the reception module. 13. The method of claim 12,
The processor comprising:
And selectively transmit uplink data when transmitting the sounding reference signal according to whether the resource operation information includes resource area allocation information for data transmission. In a wireless mobile communication system,
A receiving module for receiving a wireless signal;
A transmission module for transmitting a radio signal; And
Scheduling an available resource area of the system including resource allocation for channel sounding, generating resource operation information according to the resource area scheduling, transmitting the resource operation information to the terminal through the transmission module,
A plurality of antennas of the UE through all or a part of resource areas allocated for demodulation reference signal transmission in a subframe including a plurality of single carrier-frequency division multiple access (SC-FDMA) symbols according to the resource operation information; Receives a sounding reference signal transmitted using the sounding reference signal,
The resource region for transmission of the sounding reference signal is a resource region added to the last SC-FDMA symbol in the subframe,
The resource allocation information for channel sounding includes a cyclic shift value and an orthogonal cover code index for the sounding reference signal used in each slot in the subframe for each of the plurality of antennas,
Wherein the cyclic shift value is a value that is not used for the demodulation reference signal. 16. The method of claim 15,
The processor,
Generates indication information indicating whether a sounding reference signal is to be transmitted, and transmits the indication information to the terminal through the transmission module,
Wherein the indication information indicates transmission of a demodulation reference signal or a sounding reference signal in a resource region allocated for the demodulation reference signal transmission at the terminal. 16. The method of claim 15,
The processor,
And multiplexes and schedules a resource region allocated for transmission of two or more demodulation reference signals as a resource region for the channel sounding. 16. The method of claim 15,
The processor,
And scheduling to selectively allocate a resource area for data transmission. 16. The method of claim 15,
The processor,
And performs channel sounding on the sounding reference signal received from the terminal through the reception module.

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