WO2014027803A2

WO2014027803A2 - Method for controlling transmission of uplink sounding reference signal, and apparatus therefor

Info

Publication number: WO2014027803A2
Application number: PCT/KR2013/007207
Authority: WO
Inventors: 노민석
Original assignee: 주식회사 케이티
Priority date: 2012-08-16
Filing date: 2013-08-09
Publication date: 2014-02-20
Also published as: WO2014027803A3; KR20140023855A

Abstract

The present invention relates to a method for controlling transmission of an uplink sounding reference signal, and an apparatus therefor, the method for a first base station to control the transmission of a sounding reference signal by a terminal according to one embodiment of the present invention comprising the steps of: a second base station, which is to receive a sounding reference signal from the terminal, determining sequence information for the signal to be received; and transmitting, to the terminal, a physical downlink control channel comprising or indicating the sequence information, and a physical downlink shared channel comprising an RRC parameter, wherein the physical downlink control channel or the physical downlink data channel comprises the necessary information for the terminal to transmit the sounding reference signal to the second base station, or the sequence for a physical uplink control channel or a physical uplink shared channel to be transmitted to the second base station.

Description

Method and apparatus for controlling transmission of uplink sounding reference signal

The present invention relates to a method and apparatus for controlling transmission of an uplink sounding reference signal, and more particularly, to a technique for controlling transmission of a sounding reference signal in a network situation in which two or more base stations exist.

As communication systems have evolved, consumers, such as businesses and individuals, have used a wide variety of wireless terminals. Mobile communication systems such as LTE (Long Term Evolution) and LTE-A (LTE Advanced) of the current 3GPP series are high-speed and large-capacity communication systems that can transmit and receive various data such as video and wireless data, beyond voice-oriented services. Therefore, there is a demand for developing a technology capable of transmitting a large amount of data corresponding to a wired communication network. As a method for transmitting a large amount of data, data can be efficiently transmitted using a plurality of cells. In transmitting data using multiple cells or transmission / reception points, signal collision may occur, which has been a problem. That is, in transmitting a reference signal, a problem arises in that an existing scheme cannot be applied to a plurality of cells.

In order to solve the above-described problem, the present invention transmits a sounding reference signal independently in the context of a plurality of network devices in cooperation with the uplink or by applying a sequence of an uplink control channel or data channel. In this process, sequence hopping or sequence group hopping is controlled.

According to an embodiment of the present invention, a method of controlling transmission of a sounding reference signal of a terminal by a first base station includes determining sequence information of a signal to be received by a second base station to receive a sounding reference signal of the terminal; And transmitting a physical downlink shared channel including a physical downlink control channel including the sequence information or indicating the sequence information and an RRC parameter to the terminal. The physical downlink control channel or the physical downlink data channel may include information required for the terminal to transmit the sounding reference signal to a second base station, or a physical uplink control channel to be transmitted to the second base station. A sequence of Control Channels or a Physical Uplink Data Channel (Phy) to transmit to the second base station sical Uplink Shared CHannel).

According to an embodiment of the present invention, a method of controlling a transmission of a sounding reference signal by a terminal may include a physical downlink data channel including a physical downlink control channel and an RRC parameter from a first base station. Receiving a shared channel, information included in the physical downlink control channel or the physical downlink data channel, a sequence of a physical uplink control channel to be transmitted to a second base station, or the second base station; Generating a sounding reference signal by applying one of a sequence of a physical uplink shared channel to be transmitted, and transmitting the sounding reference signal to the second base station; Include.

The base station according to an embodiment of the present invention is a control unit for determining the sequence information of the signal to be received by the second base station to receive the sounding reference signal of the terminal, and includes the sequence information or instructs the sequence information to the terminal And a transmitter for transmitting a physical downlink shared channel including a physical downlink control channel and an RRC parameter, wherein the physical downlink control channel or the physical downlink data channel Is information required for the terminal to transmit the sounding reference signal to a second base station, or a sequence of physical uplink control channels (Physical Uplink Control CHannel) to be transmitted to the second base station or physical uplink data to be transmitted to the second base station Characterized by a sequence of channels (Physical Uplink Shared CHannel) A base station.

A terminal according to an embodiment of the present invention is a receiver for receiving a physical downlink shared channel including a physical downlink control channel (Physical Downlink Control CHannel) and RRC parameters from the first base station, the physical downlink Information included in a link control channel or the physical downlink data channel, a sequence of a physical uplink control channel to be transmitted to a second base station, or a physical uplink shared channel to be transmitted to the second base station And a control unit for generating a sounding reference signal by applying any one of the sequences, and a transmitter for transmitting the sounding reference signal to the second base station.

When the present invention is implemented, the UE belonging to any base station, i.e., a UE having received a downlink control channel through the base station supports transmission to a base station different from the base station having better uplink channel quality and geometry. Overcomes link coverage. In addition, by enabling the measurement of the uplink channel state with the base station other than the serving base station through the transmission of the aperiodic sounding reference signal, it is possible to overcome the coverage shortage of the uplink (coverage shortage).

In addition, by identifying the location of the terminal using the sounding channel or the geometry of the terminal to determine the data transmission for the downlink by using the terminal-specific downlink transmission method for the downlink transmission according to the terminal located in the cell boundary or cell center It can also be used to improve data throughput.

1 is a diagram illustrating a position of a sounding reference signal on a subframe.

2 is a diagram illustrating frequency hopping of a periodic sounding reference signal.

3 is a diagram illustrating sounding reference signal allocation in the frequency domain.

4 is a diagram illustrating a conventional uplink / downlink data transmission method.

5 illustrates a method of transmitting uplink / downlink data.

6 to 15 illustrate an uplink / downlink data transmission method according to one embodiment of the present invention.

16 is a diagram illustrating a process of controlling transmission of a sounding reference signal of a terminal by a first base station according to an embodiment of the present invention.

17 is a diagram illustrating a process of controlling transmission of a sounding reference signal by a terminal according to an embodiment of the present invention.

18 is a diagram illustrating a configuration of a first base station according to another embodiment.

19 is a diagram illustrating a configuration of a user terminal according to another embodiment.

Hereinafter, some embodiments of the present invention will be described in detail through exemplary drawings. In adding reference numerals to the components of each drawing, it should be noted that the same reference numerals are assigned to the same components as much as possible even though they are shown in different drawings. In addition, in describing the present invention, when it is determined that the detailed description of the related well-known configuration or function may obscure the gist of the present invention, the detailed description thereof will be omitted.

The wireless communication system in the present invention is widely deployed to provide various communication services such as voice, packet data, and the like. The wireless communication system includes a user equipment (UE) and a base station (base station, BS, or eNB). In the present specification, a user terminal is a comprehensive concept of a terminal in wireless communication. In addition to user equipment (UE) in WCDMA, LTE, and HSPA, as well as MS (Mobile Station), UT (User Terminal), SS in GSM, It should be interpreted as a concept that includes a subscriber station, a wireless device, and the like. Hereinafter, in the present specification, a user terminal may be referred to as a terminal for short.

A base station or a cell generally refers to a station that communicates with a user terminal, and includes a Node-B, an evolved Node-B, an Sector, a Site, and a BTS. It may be called other terms such as a base transceiver system, an access point, a relay node, a remote radio head (RRH), a radio unit (RU), and the like.

That is, in the present specification, a base station or a cell is interpreted in a comprehensive sense to indicate some areas or functions covered by a base station controller (BSC) in CDMA, a NodeB in WCDMA, an eNB or a sector (site) in LTE, and the like. Various coverage such as mega cell, macro cell (hereinafter referred to as 'eNB'), micro cell, pico cell, femto cell, small cell and relay node, RRH, RU communication range It is meant to encompass all areas.

Since the various cells listed above have a base station for controlling each cell, the base station may be interpreted in two senses. i) the device providing the megacell, the macrocell, the microcell, the picocell, the femtocell, the small cell in relation to the wireless area, or ii) the wireless area itself. In i) all devices which provide a given wireless area are controlled by the same entity or interact with each other to cooperatively configure the wireless area to direct the base station. The eNB, RRH, antenna, RU, LPN, point, transmit / receive point, transmit point, receive point, etc. become embodiments of the base station according to the configuration of the radio region. In ii), the base station may indicate the radio area itself to receive or transmit a signal from a viewpoint of a user terminal or a neighboring base station.

Therefore, megacells, macrocells, microcells, picocells, femtocells, small cells, RRHs, antennas, RUs, low power nodes (LPNs), points, eNBs, transmit and receive points, transmit points, and receive points are collectively referred to the base station. Refers to.

In the present specification, the user terminal and the base station are two transmitting and receiving entities used to implement the technology or technical idea described in this specification in a comprehensive sense and are not limited by the terms or words specifically referred to. The user terminal and the base station are two types of uplink or downlink transmitting / receiving subjects used to implement the technology or the technical idea described in the present invention, and are used in a generic sense and are not limited by the terms or words specifically referred to. Here, the uplink (Uplink, UL, or uplink) refers to a method for transmitting and receiving data to the base station by the user terminal, the downlink (Downlink, DL, or downlink) means to transmit and receive data to the user terminal by the base station It means the way.

There is no limitation on the multiple access scheme applied to the wireless communication system. Various multiple access techniques such as Code Division Multiple Access (CDMA), Time Division Multiple Access (TDMA), Frequency Division Multiple Access (FDMA), Orthogonal Frequency Division Multiple Access (OFDMA), OFDM-FDMA, OFDM-TDMA, OFDM-CDMA Can be used. One embodiment of the present invention is resource allocation in the fields of asynchronous wireless communication evolving to LTE and LTE-A (LTE-advanced) through GSM, WCDMA, HSPA, and synchronous wireless communication evolving to CDMA, CDMA-2000 and UMB. Can be applied to The present invention should not be construed as being limited or limited to a specific wireless communication field, but should be construed as including all technical fields to which the spirit of the present invention can be applied.

The uplink transmission and the downlink transmission may use a time division duplex (TDD) scheme that is transmitted using different times, or may use a frequency division duplex (FDD) scheme that is transmitted using different frequencies.

In addition, in a system such as LTE and LTE-A, a standard is configured by configuring uplink and downlink based on one carrier or a pair of carriers. Uplink and downlink transmit control information through control channels such as Physical Downlink Control CHannel (PDCCH), Physical Control Format Indicator CHannel (PCFICH), Physical Hybrid ARQ Indicator CHannel (PHICH), and Physical Uplink Control CHannel (PUCCH). A data channel is configured such as a PDSCH (Physical Downlink Shared CHannel), a PUSCH (Physical Uplink Shared CHannel), and the like to transmit data.

On the other hand, control information may also be transmitted using an enhanced PDCCH (EPDCCH or extended PDCCH).

In the present specification, a cell means a component carrier having a coverage of a signal transmitted from a transmission / reception point or a signal transmitted from a transmission point or a transmission / reception point, and the transmission / reception point itself. Can be.

A wireless communication system or base station to which embodiments are applied is a coordinated multi-point transmission / reception system (CoMP system) or a coordinated multi-antenna transmission scheme in which two or more transmission / reception points cooperate to transmit a signal. multi-antenna transmission system, a cooperative multi-cell communication system. The CoMP system may include at least two multiple transmission / reception points and terminals.

The multiple transmit / receive point is at least one having a base station or a macro cell (hereinafter referred to as an eNB) and a high transmission power or a low transmission power in a macro cell region, which is wired controlled by an optical cable or an optical fiber to the eNB. May be RRH.

Hereinafter, downlink refers to a communication or communication path from a multiple transmit / receive point, which is a base station, to a terminal, and uplink (uplink) refers to a communication or communication path from a terminal to multiple transmit / receive points, which is a base station. In downlink, the transmitter may be part of a base station, for example, multiple transmit / receive points, and the receiver may be part of a terminal. In uplink, a transmitter may be part of a terminal, and a receiver may be part of a base station that is a multiple transmission / reception point.

Hereinafter, a situation in which a signal is transmitted and received through a channel such as a PUCCH, a PUSCH, a PDCCH, an EPDCCH, and a PDSCH may be expressed in the form of 'sending and receiving a PUCCH, a PUSCH, a PDCCH, an EPDCCH, and a PDSCH.'

Hereinafter, the description of transmitting or receiving the PDCCH or transmitting or receiving a signal through the PDCCH includes transmitting or receiving an EPDCCH or transmitting or receiving a signal through the EPDCCH.

That is, the physical downlink control channel described below may mean PDCCH or EPDCCH, and may also be used to include both PDCCH and EPDCCH. In addition, for convenience of description, the EPDCCH which is an embodiment of the present invention may be applied to the portion described as the PDCCH, and the PDCCH which is an embodiment of the present invention may be applied to the portion described as the EPDCCH.

Meanwhile, high layer signaling described below includes RRC signaling for transmitting RRC information including an RRC parameter.

The eNB performs downlink transmission to the terminals. The eNB includes downlink control information and an uplink data channel (eg, a physical downlink shared channel (PDSCH), which is a primary physical channel for unicast transmission, and scheduling required to receive the PDSCH. For example, a physical downlink control channel (PDCCH) or EPDCCH for transmitting scheduling grant information for transmission in a physical uplink shared channel (PUSCH) may be transmitted. Hereinafter, the transmission and reception of signals through each channel will be described in the form of transmission and reception of the corresponding channel.

At this time, as described with reference to the drawings below, the first terminal UE1 may transmit an uplink signal to the eNB and the second terminal may transmit an uplink signal to the RRH.

1 is a diagram illustrating a position of a sounding reference signal on a subframe. The SRS period of the sounding reference signal in FIG. 1 is defined as N subframes, and one subframe includes a plurality of symbols. The sounding reference signal is carried on the last symbol of the subframe.

2 is a diagram illustrating frequency hopping of a periodic sounding reference signal. SRS is indicated according to whether or not frequency hopping is performed in a space represented by frequency and time. 210 shows a non-frequency hopping SRS, and 220 shows a frequency hopping SRS.

3 is a diagram illustrating sounding reference signal allocation in the frequency domain. The OFDM modulator 310 generates M SRS generation codes as SRS signals.

4 is a diagram illustrating a conventional uplink / downlink data transmission method. The terminal 412 transmits and receives uplink and downlink control channels and data channels, and SRSs and RSs (reference signals) to and from the macro node 410, and

other terminals

422 and 424 communicate with the pico node 420. Transmit and receive data channels and control channels. The macro node 410 and the pico node 420 have different cell IDs. In more detail, the terminal 412 receives the PDCCH (or EPDCCH instead of PDCCH) and / or PDSCH from the macro node 410, and receives PDSCH / PUCCH / SRS and from the macro node 410. Receive a related RS.

5 illustrates a method of transmitting uplink / downlink data. In FIG. 5, the terminal 541 at the boundary of the coverage consisting of three

nodes

522, 524, and 526 transmits a macro node 510, an uplink control channel, and a data channel, and a downlink control channel and / or The data channel is being received. In FIG. 5, the macro node 510 and six

nodes

522, 524, 526, 532, 534, and 536 use one cell ID.

In the case of a reference signal for PUSCH data demodulation, in the conventional system, a parameter for generating a reference signal transmitted by a user equipment from an arbitrary base station or an arbitrary cell to the terminal, that is, a sequence group index, The terminal receives the sequence index, the cyclic shift index, and the orthogonal cover code (OCC) index information from the base station to which the corresponding terminal belongs. The terminal 1) the configuration of sequence group hopping and sequence hopping set to a cell ID and a radio resource control (RRC) configured to distinguish the base station ( According to the configuration, the sequence group index and the sequence index is informed to the terminal. In addition, 2) the base station transmits a PDCCH (or EPDCCH instead of PDCCH) for uplink transmitted through downlink, that is, for generating a reference signal to be transmitted by the UE through DCI format 0 and DCI format 4 for uplink. Cyclic shift index (cyclic shift index), OCC index will be informed. Through the processes 1) and 2), the UE generates a reference signal for data demodulation and transmits the reference signal and the uplink PUSCH to an arbitrary base station. Sounding used to measure uplink channel state for uplink frequency dependent scheduling or for measuring uplink / downlink channel state for DL beamforming using channel reciprocity in TDD system In the case of a sounding reference signal, in a conventional system, a parameter for generating a sounding reference signal transmitted from an arbitrary base station or an arbitrary cell to a terminal, that is, a cell-specific SRS bandwidth of a sounding reference signal A cell specific SRS bandwidth and a transmission comb designate a frequency position in transmitting a sounding reference signal. Frequency positions allocated at intervals of two subcarriers are designated and, for example, 0 indicates an even subcarrier, and 1 indicates an odd subcarrier. UE-specific SRS bandwidth (ue-specific SRS bandwidth) indicates the bandwidth required for transmitting the sounding reference signal for each terminal. Information on hopping related configuration parameters, frequency domain position, and periodicity may be parameters required for generating a sounding reference signal. In addition, in terms of parameters, a subframe configuration designates in which subframe a sounding reference signal should be transmitted. The antenna configuration indicates the number of antennas for transmitting a sounding reference signal, for example, the number of antenna ports. The base sequence index is a sounding reference signal sequence index for generating a corresponding sounding reference signal, which is determined according to the sequence group number u and the sequence hopping configuration used in the PUCCH. It is determined according to the sequence number v determined. The cyclic shift index indicates a reference used when generating a sounding reference signal. The base station transmits the above-described parameters and configuration information to the terminal as an RRC parameter, and the terminal receives the corresponding information to transmit an uplink sounding reference signal.

Meanwhile, the aperiodic sounding reference signal may be additionally transmitted from the base station together with the periodic sounding reference signal. Similar to the periodic sounding reference signal, the corresponding aperiodic sounding reference signal is used to generate various parameters used for generating the aperiodic sounding reference signal from an arbitrary base station or an arbitrary cell to a user equipment as used in a conventional system. These parameters are used to generate the aperiodic sounding reference signal transmitted by the terminal. That is, UE-specific SRS bandwidth (UE-specific SRS bandwidth) of the aperiodic sounding reference signal, transmission comb, information on the frequency domain position (periodicity), subframe configuration (subframe configuration) Parameters such as antenna configuration, base sequence index, cyclic shift index, and the like used in generating the cyclic sounding reference signal, such that the base station is dynamically By triggering the transmission of the aperiodic sounding reference signal through the PDCCH (or EPDCCH), the UE receives the triggering and RRC parameters by the PDCCH (or EPDCCH) to transmit the uplink aperiodic sounding reference signal From a conventional technology, a reference signal transmitted by a UE belonging to an arbitrary cell / base station / RRH / antenna / RU is transmitted from an arbitrary base station. Only a reference signal transmitted by the terminal can be received, and since any other cell / base station / RRH / antenna / RU cannot know the information for generating a reference signal transmitted by the terminal, the corresponding reference signal can be received. none. The reception here does not mean that the reference signal is received by interference, but that the reference signal is received as a desired signal in accordance with the purpose of the signal transmitted by the terminal.

In addition, a terminal receiving a parameter transmitted from any cell / base station / RRH / antenna / RU may be configured to generate an associated demodulation reference signal and a periodic / aperiodic sounding reference signal from the corresponding cell / base station / RRH / antenna / RU. Since reference signals are generated based on the transmitted parameters, only downlink and uplink transmission from the cell / base station / RRH / antenna / RU to which the UE belongs is possible, and there is no downlink and linkage. Transmission on the uplink is impossible.

A terminal belonging to a corresponding cell / base station / RRH / antenna / RU, that is, a terminal receiving a downlink control channel through the corresponding cell / base station / RRH / antenna / RU to a base station belonging to the cell / base station / RRH / antenna / RU Transmission to a cell / base station / RRH / antenna / RU that is different from the cell / base station / RRH / antenna / RU having better uplink channel quality and geometry without performing uplink data transmission may be supported. I can't.

According to the present invention, a UE belonging to an arbitrary cell / base station / RRH / antenna / RU, that is, a terminal receiving a downlink control channel through the corresponding cell / base station / RRH / antenna / RU has a better channel quality and geometry of uplink. It provides a specific method for supporting transmission to a cell / base station / RRH / antenna / RU that is different from the cell / base station / RRH / antenna / RU, and also a terminal belonging to an arbitrary cell / base station / RRH / antenna / RU. Uplink channel (e.g., PUSCH, PUCCH, SRS related RS) transmitted to this corresponding cell / base station / RRH / antenna / RU and a cell / base station other than the corresponding cell / base station / RRH / antenna / RU The present invention relates to a method for identifying uplink channels transmitted to / RRH / antenna / RU. The division of the corresponding channel may be a division for the same channel type (ie, a division between SRSs, PUSCHs, PUCCHs, and related RSs) and a division for different channel types (ie, SRS and PUSCH). Between the PUCCH and the PUSCHs, and the PUCCH and the SRSs).

In addition, the present invention transmits a sounding reference signal independently from the uplink or transmits a sequence of uplink control channels or data channels in the context of a cooperating CoMP or heterogeneous network. We want to control sequence hopping or sequence group hopping.

The sequence group index and the sequence index used for the periodic and aperiodic sounding reference signals as described in the prior art are defined from the sequence group index u used in the PUCCH and from the defined sequence index v in sequence hopping. do. However, the present invention below proposes a method of setting the sequence group index u and the sequence index v used in the periodic and aperiodic sounding reference signals in a manner different from that of the conventional art.

Hereinafter, the first base station means a cell / base station / RRH / antenna / Radio Unit (RUN) / low power node (LPN) / point in which a downlink control channel is transmitted, and the second base station is a base station other than the first base station. For example, the base station may have a better channel quality and geometry of the uplink than the first base station.

The following is a sequence setting method for an independent sounding reference signal. Ai) include sounding reference signal related sequences in the RRC configuration parameter, or a-ii) or dynamically transmitted PDCCH (or EPDCCH) to generate a sequence for an independent sounding reference signal to be transmitted to the second base station. 1 bit dynamic indication through PDCCH (or EPDCCH) for a predefined parameter through RRC parameter or RRC parameter, and in this process, aperiodic / periodic sounding reference signals are equal to each other, or You can implement it independently.

제 1-1 실시예Embodiment 1-1

A sounding reference signal is generated independently, but a sequence group index and a sequence index of a periodic sounding reference signal and an aperiodic sounding reference signal are set identically.

PUCCH sequence group index or PUSCH based on the cell group (cell ID) based on the sequence group index of the sounding reference signal sequence for generating the sounding reference signal when the aperiodic or periodic sounding reference signal is transmitted In order to generate a sequence independent from the corresponding PUCCH and PUSCH sequence, rather than generating it from the sequence index, the PDCCH (or EPDCCH) that includes sounding reference signal-related sequences additionally included in the RRC configuration parameter or is dynamically transmitted (1 bit dynamic indication) using the 1 bit through the PDCCH (or EPDCCH) or the predefined parameter through the RRC parameter. This allows the sounding reference signal to be set so that a sequence independent of the PUCCH and the PUSCH can be generated. This will allow independent transmission of serving cell / base station / RRH / antenna / RU and transmission of sounding reference signals to other cells / base station / RRH / antenna / RU than the serving cell / base station / RRH / antenna / RU. How to set it up.

This method sets the same sequence group index and sequence index of the periodic sounding reference signal and the aperiodic sounding reference signal sequence with respect to the sounding reference signal, and is independent of the sequence group index and sequence index of PUCCH and PUSCH. How to set. That is, uplink channel quality measurement and channel reciprocity of the serving cell / base station / RRH / antenna / RU and other cells / base station / RRH / antenna / RU can be set by enabling sequence setting for a sounding reference signal independently of the PUCCH and the PUSCH. In a TDD system using channel reciprocity, quality measurements for downlinks of a serving cell / base station / RRH / antenna / RU and another cell / base station / RRH / antenna / RU can be independently performed. In addition, by identifying the location of the terminal using the sounding channel or the geometry of the terminal to determine the data transmission for the downlink by using the terminal-specific downlink transmission method for the downlink transmission according to the terminal located in the cell boundary or cell center It can also be used to improve data throughput.

제 1-2 실시예Example 1-2

A sounding reference signal is generated independently, but is also independently set between the sequence group index and the sequence index of the periodic sounding reference signal and the aperiodic sounding reference signal.

The sequence group index and sequence index used for the periodic reference signal and the sequence group index and sequence index used for the aperiodic reference signal are independently assigned through the RRC parameter or the sequence index is assigned to the corresponding PDCCH (or EPDCCH). It is a method of dynamically indicating an instruction by using 1 bit or including an instruction for a predefined RRC parameter through an RRC parameter. This allows the sounding reference signal to be set so that a sequence independent of the PUCCH and the PUSCH can be generated and additionally in the serving cell / base station / RRH / antenna / RU and other cell / base station / RRH / antenna / RU transmissions of the UE. The present invention proposes a method that can give flexibility to scheduling of a base station. This is for the transmission of the periodic reference signal and the aperiodic reference signal to the serving cell / base station / RRH / antenna / RU and to a cell / base station / RRH / antenna / RU different from the serving cell / base station / RRH / antenna / RU. It is a way to set up the transmission independently.

This is a method of independently setting the sequence group index and the sequence index of the periodic sounding reference signal and the aperiodic sounding reference signal sequence, and also independently of the sequence group index and the sequence index of the PUCCH and the PUSCH. That is, it is possible to set a sequence for a sounding reference signal independently of the PUCCH and the PUSCH, and to set an independent sequence for the periodic sounding reference signal and the aperiodic sounding reference signal, thereby serving the cell / base station / RRH / antenna. In a TDD system using uplink channel quality measurement and channel reciprocity for / RU and other cells / base stations / RRH / antennas / RUs, the serving cell / base station / RRH / antenna / RU and other cells / base stations / RRH / antenna / RU The quality measurement for the downlink can be made independently. In addition, by identifying the location of the terminal using the sounding channel or the geometry of the terminal to determine the data transmission for the downlink by using the terminal-specific downlink transmission method for the downlink transmission according to the terminal located in the cell boundary or cell center Can also be used to improve

In the 1-1 and 1-2 embodiments, the periodic sounding reference signal and the aperiodic sounding reference signal transmitted to the second base station are identical or independent of each other, but are always configured independently of the PUCCH and the PUSCH. do.

The first and second embodiments are summarized as follows. The sounding reference signal to be transmitted to the second base station is separately allocated a sequence group index and a sequence index used in a periodic or aperiodic sounding reference signal to generate a sequence independent of the corresponding PUCCH and PUSCH sequences. In order to receive the sequence group index and the sequence index separately, the first base station may additionally include sounding reference signal related sequences in the RRC configuration parameter. In addition, after predefined parameters are transmitted to the UE, the 1-bit dynamic indication may be performed to the UE through a PDCCH (or EPDCCH) which is dynamically transmitted. As a result, a sounding reference signal is generated with a sequence independent of the PUCCH and the PUSCH, which can be configured to enable transmission to the first communication system and transmission of the sounding reference signal to the second communication system independently. In addition, in the embodiment 1-1, the sequence group index and the sequence index of the periodic / aperiodic sounding reference signal are the same, whereas in the embodiment 1-2, the sequence group index, the sequence index and the aperiodic sound of the periodic sounding reference signal are the same. The sequence group index and the sequence index of the ding reference signal may be configured independently of each other, thereby additionally giving flexibility to scheduling of the base station in transmission of the first communication system and the second communication system of the terminal.

The following is a method of establishing an association with a sequence used in a PUCCH. When the base station receiving the PUCCH to be transmitted by the UE is the second system rather than the first system, the UE sets the sequence used in the PUCCH when generating the sequence of the sounding reference signal to both aperiodic and periodic sounding reference signals. Or b-ii) only for aperiodic sounding reference signals.

제 2-1 실시예2-1 Example

When the reception target for the PUCCH is set to a cell / base station / RRH / antenna / RU other than the serving cell / base station / RRH / antenna / RU, that is, the UE-specific PUCCH sequence and PUCCH when generating a sequence for PUCCH and PUCCH RS transmission In case of transmission to another cell / base station / RRH / antenna / RU through the setting of RS sequence, the corresponding aperiodic and periodic sounding reference signals follow the configuration of the sequence used in the PUCCH. A method of enabling uplink transmission to the same target base station. This enables the measurement of uplink channel conditions with other cells / base stations / RRH / antennas / RUs other than the serving cell / base station / RRH / antenna / RU through transmission of periodic and aperiodic sounding reference signals. (coverage shortage) can be used in a way that allows for overcoming. In addition, in a TDD system using uplink channel quality measurement and channel reciprocity for a serving cell / base station / RRH / antenna / RU and another cell / base station / RRH / antenna / RU, the serving cell / base station / RRH / antenna / RU and other cells It is possible to make quality measurements for downlink of / base station / RRH / antenna / RU independently. In addition, by identifying the location of the terminal using the sounding channel or the geometry of the terminal to determine the data transmission for the downlink by using the terminal-specific downlink transmission method for the downlink transmission according to the terminal located in the cell boundary or cell center Can also be used to improve

제 2-2 실시예Example 2-2

When the reception target for the PUCCH is set to a cell / base station / RRH / antenna / RU other than the serving cell / base station / RRH / antenna / RU, that is, the UE-specific PUCCH sequence and PUCCH when generating a sequence for PUCCH and PUCCH RS transmission In case of transmission to another cell / base station / RRH / antenna / RU through the setting of the RS sequence, the periodic sounding reference signal is transmitted through the serving cell / base station / RRH / antenna / RU serving the UE. The periodic sounding reference signal is configured to follow the configuration of the sequence used in the PUCCH to enable uplink transmission to the same target base station with the same PUCCH and aperiodic sounding reference signal. This enables measurement of an uplink channel state with a cell / base station / RRH / antenna / RU other than the serving cell / base station / RRH / antenna / RU through transmission of an aperiodic sounding reference signal triggered from the base station. It can be used in a way that can overcome the lack of coverage of the uplink.

In addition, in a TDD system using uplink channel quality measurement and channel reciprocity for a serving cell / base station / RRH / antenna / RU and another cell / base station / RRH / antenna / RU, the serving cell / base station / RRH / antenna / RU and other cells It is possible to make quality measurements for downlink of / base station / RRH / antenna / RU independently. In addition, by identifying the location of the terminal using the sounding channel or the geometry of the terminal to determine the data transmission for the downlink by using the terminal-specific downlink transmission method for the downlink transmission according to the terminal located in the cell boundary or cell center Can also be used to improve

In the case of the terminal transmitting the PUCCH to the second base station in the embodiments 2-1 and 2-2, the aperiodic sounding reference signal transmitted by the terminal to the second base station follows the configuration of the sequence used in the PUCCH. In the second embodiment, the periodic sounding reference signal also follows the configuration of the sequence used in the PUCCH. As a result, both aperiodic / periodic sounding reference signals are transmitted to the second base station, which is the same target base station as the PUCCH. In contrast, in the second embodiment, the periodic sounding reference signal is configured to be transmitted to the first base station. As a result, the aperiodic sounding reference signal and the PUCCH are transmitted to the second base station, which is the same target base station.

The following is a method of establishing an association with a sequence used in a PUSCH. When the base station receiving the PUSCH to be transmitted by the UE is the second system rather than the first system, the setting of the sequence used by the PUSCH when the sequence of the sounding reference signal is generated is applied to both aperiodic and periodic sounding reference signals. Or c-ii) only for aperiodic sounding reference signals.

제 3-1 실시예Example 3-1

The PUCCH relates to a method of associating with a receiving target serving cell / base station / RRH / antenna / RU for a PUSCH separately from the receiving target serving cell / base station / RRH / antenna / RU. This is when the reception target for the PUSCH is set to a cell / base station / RRH / antenna / RU other than the serving cell / base station / RRH / antenna / RU, that is, the UE-specific PUSCH RS sequence is set up when generating a sequence for PUSCH RS transmission. In case of transmission to other cells / base stations / RRH / antennas / RUs, the corresponding aperiodic and periodic sounding reference signals follow the configuration of the sequence used by the PUSCH to the same target base station. A method of enabling uplink transmission. This enables the measurement of uplink channel conditions with other cells / base stations / RRH / antennas / RUs other than the serving cell / base station / RRH / antenna / RU through transmission of periodic and aperiodic sounding reference signals. Can be used in a way that allows for overcoming

제 3-2 실시예Example 3-2

When the reception target for the PUSCH is set to a cell / base station / RRH / antenna / RU other than the serving cell / base station / RRH / antenna / RU, that is, the UE-specific PUSCH RS sequence is set when generating a sequence for PUSCH RS transmission. In the case of transmission to another cell / base station / RRH / antenna / RU, the periodic sounding reference signal is transmitted through the serving cell / base station / RRH / antenna / RU serving the UE, and the aperiodic sounding reference signal In this case, the configuration of the sequence used by the PUSCH RS is followed to enable uplink transmission to the same target base station with the same PUSCH and aperiodic sounding reference signal. This enables the measurement of uplink channel state with a cell / base station / RRH / antenna / RU other than the serving cell / base station / RRH / antenna / RU through the transmission of the aperiodic sounding reference signal triggered from the base station. It can be used in a way that allows overcoming lack of coverage.

In the case of the UE transmitting the PUSCH to the second base station in the embodiments 3-1 and 3-2, the aperiodic sounding reference signal transmitted by the UE to the second base station follows the configuration of the sequence used in the PUSCH. In the third embodiment, the periodic sounding reference signal also follows the configuration of the sequence used in the PUSCH. As a result, both aperiodic / periodic sounding reference signals are transmitted to the second base station, which is the same target base station as the PUSCH. On the other hand, in the embodiment 3-2, the periodic sounding reference signal is configured to be transmitted to the first base station. As a result, the aperiodic sounding reference signal and the PUSCH are transmitted to the second base station having the same target base station.

A procedure of a terminal for detecting a corresponding uplink grant upon blind decoding of a downlink control channel, that is, a PDCCH (or EPDCCH) according to a sequence of a corresponding sounding reference signal will be described below. .

In the case of including an indication of a related sequence index in the PDCCH (or EPDCCH) and a method of performing a dynamic indication using a predefined RRC parameter of 1 bit through the RRC, the UE detects the PDCCH (or EPDCCH). UE operation to find uplink grants DCI format 0 and DCI format 4 that contain uplink scheduling information for the corresponding UE in a UE dedicated search space rather than the UE common search space Let's define a behavior. Therefore, after the Rel-11, the UE may be configured to always search for a grant containing related uplink scheduling information in the UE-specific search space when performing the related operation.

According to the present invention, a UE belonging to an arbitrary cell / base station / RRH / antenna / RU, that is, a terminal receiving a downlink control channel through the corresponding cell / base station / RRH / antenna / RU has a better channel quality and geometry of uplink. The present invention provides a specific method for configuring transmission support to a cell / base station / RRH / antenna / RU that is different from the cell / base station / RRH / antenna / RU. More specifically, the present invention relates to a method of setting sequence group hopping and sequence hopping for a sounding reference signal. The present invention relates to a method for determining a sequence group index (u) and a sequence index (v) used for a sounding reference signal.

As a method for randomizing inter-cell interference between terminals belonging to different cells in the uplink, a sequence group hopping and a sequence hopping method will be briefly described as follows.

Sequence group hopping: Regardless of the number of RBs allocated to a UE, 30 sequence groups are hopped in a slot by slot. The configuration is set to RRC (RRC parameter "Group -hopping-enabled ").

Sequence hopping: When the number of RBs allocated to the UE is 6 RB or more, the number of base sequences is set to 2 in the corresponding sequence hopping. In this case, the base sequence is hopped slot-slot within the sequence group, and the setting is set to RRC. (RRC parameter "Sequence-hopping-enabled")

When the corresponding subframe consists of subframes for transmitting the SRS, the SRS allocated to the last symbol in one subframe is a sequence group hopping set from the RRC configuration as used in the uplink DM-RS. -enabled), the sequence group hopping parameter (sequence-hopping-enabled) is set to change the sequence in units of slots.

In the above embodiments 1-1, 1-2, 2-1, 2-2, 3-1, and 3-2, two or more base stations, for example, a base station and a base station, or a base station and a pico node, etc. We looked at the process of receiving independently. Hereinafter, the case of determining the sequence group index (u) and the sequence index (v) for the configuration of the sequence group hopping and sequence hopping that each base station can set independently can be configured as shown in Table 1.

Table 1

If a terminal belonging to a base station 1 is configured as a case 1 and a terminal belonging to a base station 2 is configured as a case 4 and a case 6, the same sequence group in the base station 1 and the base station 2 in the SRS sequence according to the VCID (virtual cell ID) And the sequence index can be set.

On the other hand, when the terminal belonging to the base station 1 is composed of case 1 and the terminal belonging to the base station 2 is composed of case 5, the same sequence group in the base station 1 and the base station 2 configures the SRS sequence according to the VCID (virtual cell ID) Although the same sequence index cannot be set, different SRS sequences may be set between two base stations, which does not guarantee orthogonality of SRSs between different base stations. Therefore, the parameter setting method according to an embodiment of the present invention can be applied to the case.

In addition, when the terminal belonging to the base station 1 is configured in case 2 and the terminal belonging to the base station 2 is configured in case 4, 5 or 6, the base station 1 and the base station 2 in the SRS sequence according to the VCID (virtual cell ID) Although the same sequence group can be set, the same sequence index cannot be set, so that different SRS sequences are set between two base stations, which does not guarantee orthogonality of SRSs between different base stations. Therefore, the parameter setting method according to an embodiment of the present invention can be applied to the case.

A parameter setting method according to an embodiment of the present invention is as follows.

In determining the v value due to sequence hopping during sequence generation of the SRS, the delta_ss parameter included in the f_ss ^ Pusch parameter is always set to zero. This configuration enables / disables the sequence group hopping (RRC parameter "Group-hopping-enabled") and sequence hopping (RRC parameter "Sequence-hopping-enabled) which can be configured at different base stations, respectively. Regardless of whether ") is enabled or disabled, only one UE-specific virtual cell ID or N_id ^ SRS parameter is applied, so that sounding reference signals between UEs belonging to different base stations Orthogonality guarantees that the UE belonging to any cell / base station / RRH / antenna / RU, i.e., a UE having received a downlink control channel through the corresponding cell / base station / RRH / antenna / RU has a better uplink channel quality and geometry. It is possible to support transmission to a cell / base station / RRH / antenna / RU that is different from the cell / base station / RRH / antenna / RU.

According to the present invention, a UE belonging to an arbitrary cell / base station / RRH / antenna / RU, that is, a terminal receiving a downlink control channel through the corresponding cell / base station / RRH / antenna / RU has a better channel quality and geometry of uplink. By supporting transmission to a cell / base station / RRH / antenna / RU that is different from the cell / base station / RRH / antenna / RU, it is possible to overcome the coverage for the uplink PUCCH channel and the PUSCH channel. In addition, the lack of uplink coverage by enabling periodic or aperiodic sounding reference signals to measure uplink channel conditions with other cells / base stations / RRH / antennas / RUs other than the serving cell / base station / RRH / antenna / RU. Enable to overcome

Hereinafter, specific examples will be described with reference to FIGS. 6 to 15. The above examples are examples of specific uplink sound reference signal transmission of the present invention described above. The cell / base station / RRH / antenna / RU, i.e., the terminal having received the downlink control channel through the corresponding cell / base station / RRH / antenna / RU has a better channel quality and geometry of the uplink cell / base station / RRH / antenna / RU. In order to distinguish a specific embodiment configured to support transmission to a different cell / base station / RRH / antenna / RU from a base station / RRH / antenna / RU and a channel to transmit to a different cell / base station / RRH / antenna / RU It relates to an embodiment.

6 illustrates an example in which a downlink control channel and a data channel are received from a base station to which a corresponding terminal belongs, and all uplink related channels are transmitted to a corresponding base station having good geometry and channel quality. The terminal 612 receives the downlink control channel PDCCH (or EPDCCH) and / or the data channel PDSCH from the first base station, for example, the macro node 610 of FIG. 6. However, all uplink-related channels (PUSCH / PUCCH / SRS, related RS) are transmitted to a second base station, for example, a pico node 620, adjacent to the terminal 612 or having good channel quality. The cell ID of the first base station 610 is # 1, and the cell ID of the pico node 620 is # 2. In FIG. 6, the pico node 620 is a base station having good geometry or channel quality for the terminal 612. When the terminal 612 transmits the SRS, the embodiments 2-1 and 3-1 may apply the PUSCH / PUCCH sequence.

FIG. 7 illustrates a downlink control channel and a data channel from a base station to which a corresponding UE belongs, and a PUCCH channel and an uplink data channel PUSCH for transmitting A / N for downlink transmission among uplink-related channels to a corresponding base station. The sounding channel is an example of transmitting to a base station different from the base station to which the terminal belongs. The terminal 712 receives the downlink control channel PDCCH (or EPDCCH) and / or the data channel PDSCH from the first base station, for example, the macro node 710 of FIG. 7. In addition, in the uplink, the UE 712 transmits the PUCCH and the PUSCH to the macro node 710. The terminal 712 transmits the sounding signal to the pico node 720. The macro base station 710 has a cell identifier (Cell ID) # 1, and the cell identifier of the pico node 720 is # 2. When the terminal 712 transmits the SRS, the embodiments 1-1 and 1-2 may be applied to be independent of the sequence of the PUSCH / PUCCH.

8 shows a downlink control channel and a data channel from a base station to which a corresponding UE belongs, and a PUCCH channel, an uplink data channel PUSCH, and a periodic sounding reference signal for transmitting A / N for downlink transmission among uplink related channels. Is transmitted to the base station and the aperiodic sounding channel is an example of transmitting to a base station different from the base station to which the terminal belongs.

The terminal 812 receives a downlink control channel, PDCCH (or EPDCCH), and / or a data channel, PDSCH, from the first base station, for example, the macro node 810 of FIG. 8. In addition, in the uplink, the UE 812 transmits the PUCCH, the PUSCH, and the periodic SRS to the macro node 810. In transmitting the sounding signal, the terminal 812 transmits the aperiodic signal to the pico node 820. The macro base station 810 has a cell identifier (Cell ID) # 1, and the cell identifier of the pico node 820 is # 2. The UE 812 may apply the second embodiment or the second embodiment to the second embodiment when transmitting the periodic SRS, and the second embodiment may be applied when transmitting the aperiodic SRS.

9 shows a downlink control channel and a data channel from a base station to which a corresponding UE belongs, and a PUCCH channel (or uplink data channel PUSCH) for transmitting A / N for downlink transmission among uplink related channels is transmitted to a corresponding base station. The uplink data channel PUSCH (or A / N channel PUCCH for downlink transmission) and the sounding signal are transmitted to a base station different from the base station to which the terminal belongs. In FIG. 9, when a terminal 912 transmits a PUCCH to a macro node 910 which is a first base station and transmits a PUSCH / SRS to a pico node 920 which is a second base station, the terminal 912 generates a sequence of an SRS. The PUSCH sequence may be applied when generating the SRS sequence by applying the embodiment 3-1. Similarly, when the terminal 912 transmits the PUSCH to the macro node 910 which is the first base station, and transmits the PUCCH / SRS to the pico node 920 which is the second base station, the terminal 912 generates a sequence when generating the SRS sequence. The sequence of the PUCCH may be applied when generating the SRS sequence by applying the embodiment 2-1.

10 shows a downlink control channel and a data channel from a base station to which a corresponding UE belongs, and a periodic sounding with a PUCCH (or uplink data channel PUSCH) channel for transmitting A / N for downlink transmission among uplink related channels. The reference signal is transmitted to the base station, and the uplink data channel PUSCH (or A / N channel PUCCH for downlink transmission) and the aperiodic sounding signal are examples of transmitting to a base station different from the base station to which the terminal belongs. In FIG. 10, when a terminal 1012 transmits a PUCCH / periodic SRS to a macro node 1010 that is a first base station and transmits a PUSCH / aperiodic SRS to a pico node 1020 that is a second base station, the terminal 1012 transmits a PUSCH / aperiodic SRS. When generating a sequence of SRS, the PUSCH sequence may be applied when generating an aperiodic SRS sequence by applying the embodiment 3-2. Similarly, when the terminal 1012 transmits a PUSCH / periodic SRS to the macro node 1010 serving as the first base station, and transmits a PUCCH / aperiodic SRS to the pico node 1020 serving as the second base station, the terminal 1012 performs non-period. When generating a sequence of periodic SRS, the second embodiment may be applied to generate a PUCCH sequence when generating a periodic SRS sequence.

FIG. 11 illustrates an example in which a downlink control channel and a data channel are received from a base station to which a corresponding terminal belongs, and all uplink related channels are transmitted to the corresponding base station with good geometry and channel quality.

The UE 1141 receives a downlink control channel, PDCCH (or EPDCCH), and / or a data channel, PDSCH, from the first base station, for example, the macro node 1110 of FIG. 11. However, all uplink-related channels (PUSCH / PUCCH / SRS, related RS) are transmitted to the base station 1126 adjacent to the terminal 1141 or having a good channel quality. The first base station 1110 has a cell identifier (Cell ID) of # 0 and uses the same cell identifier as

other base stations

1122, 1124, 1126, 1132, 1134, and 1136. Among them, the base station 1126 is a base station having good geometry or channel quality for the terminal 1141. Embodiments 2-1 and 3-1 in which a sequence of PUSCH / PUCCH is applied when transmitting an SRS may be applied.

12 shows that a downlink control channel and a data channel are received from a base station to which a corresponding UE belongs, and a PUCCH channel and an uplink data channel PUSCH for transmitting A / N for downlink transmission among uplink related channels are transmitted to a corresponding base station. The sounding signal is an example of transmitting to a base station different from the base station to which the terminal belongs.

The terminal 1241 receives a downlink control channel, PDCCH (or EPDCCH), and / or a data channel, PDSCH, from the first base station, for example, the macro node 1210 of FIG. 12. In addition, in the uplink, the UE 1241 transmits the PUCCH and the PUSCH to the macro node 1210. The terminal 1241 transmits the sounding signal to another base station 1226. The macro base station 1210 has a cell identifier (Cell ID) of # 0 and uses the same cell identifier as

other base stations

1222, 1224, 1226, 1232, 1234, and 1236. When the UE 1212 transmits the SRS, the embodiments 1-1 and 1-2 may be applied to be independent of the sequence of the PUSCH / PUCCH.

FIG. 13 illustrates a downlink control channel and a data channel from a base station to which a corresponding UE belongs, and a PUCCH channel, an uplink data channel PUSCH, and a periodic sounding reference signal for transmitting A / N for downlink transmission among uplink related channels. Is transmitted to the base station and the aperiodic sounding channel is an example of transmitting to a base station different from the base station to which the terminal belongs. The terminal 1342 receives a downlink control channel, PDCCH (or EPDCCH), and / or a data channel, PDSCH, from the first base station, for example, the macro node 1310 of FIG. 13. In the uplink, the UE 1341 transmits the PUCCH, the PUSCH, and the periodic SRS to the macro node 1310. The terminal 1342 transmits the aperiodic sounding reference signal to the second base station 1326. The macro base station 1310 has a cell identifier (Cell ID) of # 0 and uses the same cell identifier as

other base stations

1322, 1324, 1326, 1332, 1334, and 1336. The UE 1341 may apply the first to the second embodiment to the aperiodic SRS transmission, and may apply the second to the second embodiment or the second to the second embodiment when the periodic SRS is transmitted.

14 shows a downlink control channel and a data channel from a base station to which a corresponding UE belongs, and a PUCCH (or uplink data channel PUSCH) channel for transmitting A / N for downlink transmission among uplink-related channels is transmitted to a corresponding base station. The uplink data channel PUSCH (or A / N channel PUCCH for downlink transmission) and the sounding signal are transmitted to a base station different from the base station to which the terminal belongs.

The UE 1421 receives a downlink control channel, PDCCH (or EPDCCH), and / or a data channel, PDSCH, from the first base station, for example, the macro node 1410 of FIG. 14. The macro base station 1410 has a cell identifier (Cell ID) of # 0 and uses the same cell identifier as the

other base stations

1422, 1424, 1426, 1432, 1434, and 1436. In FIG. 14, when the UE 1421 transmits a PUCCH to a macro node 1410 serving as a first base station and transmits a PUSCH / SRS to a pico node 1426 serving as a second base station, the UE 1426 generates a sequence of SRSs. The PUSCH sequence may be applied when generating the SRS sequence by applying the embodiment 3-1. Similarly, when the terminal 1426 transmits a PUSCH to the macro node 1410 serving as the first base station and the PUCCH / SRS to the pico node 1426 serving as the second base station, the terminal 1426 generates a SRS sequence when generating a sequence of the SRS. The sequence of the PUCCH may be applied when generating the SRS sequence by applying the embodiment 2-1.

15 shows a downlink control channel and a data channel from a base station to which a corresponding UE belongs, and a periodic sounding with a PUCCH (or uplink data channel PUSCH) channel for transmitting A / N for downlink transmission among uplink related channels. The reference signal is transmitted to the base station, and the uplink data channel PUSCH (or A / N channel PUCCH for downlink transmission) and the aperiodic sounding signal are examples of transmitting to a base station different from the base station to which the terminal belongs. 15 shows a downlink control channel and a data channel from a base station to which a corresponding UE belongs, and a periodic sounding with a PUCCH (or uplink data channel PUSCH) channel for transmitting A / N for downlink transmission among uplink related channels. The reference signal is transmitted to the base station, and the uplink data channel PUSCH (or A / N channel PUCCH for downlink transmission) and the aperiodic sounding signal are examples of transmitting to a base station different from the base station to which the terminal belongs.

The terminal 1541 receives a downlink control channel, PDCCH (or EPDCCH), and / or a data channel, PDSCH, from the first base station, for example, the macro node 1510 of FIG. 15. In FIG. 15, when a UE 1541 transmits a PUCCH / periodic SRS to a macro node 1510 which is a first base station, and transmits a PUSCH / aperiodic SRS to a pico node 1526 that is a second base station, the UE 1541 is used. When generating a sequence of SRS, the PUSCH sequence may be applied when generating an aperiodic SRS sequence by applying the embodiment 3-2. Similarly, when the terminal 1541 transmits a PUSCH / periodic SRS to the macro node 1510 which is the first base station and transmits a PUCCH / aperiodic SRS to the pico node 1526 which is the second base station, the terminal 1541 is a non-stationary. When generating a sequence of periodic SRS, the second embodiment may be applied to generate a PUCCH sequence when generating a periodic SRS sequence. The macro base station 1510 has a cell identifier (Cell ID) of # 0 and uses the same cell identifier as the

other base stations

1522, 1524, 1526, 1532, 1534, and 1536.

Embodiments of the present invention relate to a method and apparatus for transmitting an uplink sounding reference signal in a deployment situation of a CoMP scenario 3 and a heterogeneous network or a CoMP scenario 4. .

6 to 15 illustrate the above-described 1-1, 1-2, 2-1, 2-2, 3-1, when generating a sequence in transmitting the SRS to any one of the first base station and the second base station. In the case of applying the embodiment 3-2, the sequence group / sequence hopping is applied and for the case where the orthogonality calculated in Table 1 is not guaranteed, the sequence generation during the sequence group hopping and sequence hopping of the SRS presented in the present invention is performed. The parameter setting method can be applied.

According to the present invention, a UE belonging to an arbitrary cell / base station / RRH / antenna / RU, that is, a terminal receiving a downlink control channel through the corresponding cell / base station / RRH / antenna / RU has a better channel quality and better geometry. By supporting the transmission to a cell / base station / RRH / antenna / RU different from the cell / base station / RRH / antenna / RU, it is possible to overcome the coverage for the uplink PUCCH channel and the PUSCH channel. In addition, the lack of uplink coverage by enabling periodic or aperiodic sounding reference signals to measure uplink channel conditions with other cells / base stations / RRH / antennas / RUs other than the serving cell / base station / RRH / antenna / RU. Enable to overcome

The first base station determines a second base station to receive the sounding reference signal of the terminal (S1610), and determines the sequence information of the signal to be received by the second base station (S1620). In operation S1630, the UE transmits a physical downlink data channel including the sequence information or a physical downlink control channel indicating the sequence information and an RRC parameter. The sequence information may include a sequence group index and a sequence index, or include a ue-specific virtual cell ID or delta_ss capable of generating an SRS sequence group index and a sequence index. The physical downlink control channel or the physical downlink data channel is information required for the terminal to transmit the sounding reference signal to a second base station, a sequence of a physical uplink control channel to be transmitted to the second base station, or the second It includes a sequence of physical uplink data channels to be transmitted to the base station.

In embodiments 1-1 and 1-2, the first base station transmits a sequence group index and a sequence index before transmitting the physical downlink control channel and the physical downlink data channel, or transmits to the physical downlink. RRC (Radio Resource Control) messages sent by the SRS sequence group index and sequence index or include the UE-specific virtual cell identifier (ue-specific virtual cell ID) or delta_ss that can generate the SRS sequence group index and sequence index Can be. In addition, the same sequence group index and sequence index may be set for an aperiodic / periodic sounding reference signal (Example 1-1) or sequence group indexes and sequence indexes that are independent of each other (Example 1-2).

A sequence of a physical uplink control channel to be transmitted to the second base station provided by the base station to the terminal or a sequence of a physical uplink data channel to be transmitted to the second base station for implementing the embodiments 2-1 and 3-1. The UE may generate an aperiodic / periodic sounding reference signal and transmit it to the second base station.

A sequence of a physical uplink control channel to be transmitted to the second base station provided by the base station to the terminal or a sequence of a physical uplink data channel to be transmitted to the second base station for implementing the embodiments 2-2 and 3-2. By using the UE to generate a non-periodic sounding reference signal to the second base station, the terminal may transmit a periodic reference signal for the first base station to receive, the first base station.

By applying the parameter setting method, the first base station may transmit the physical downlink control channel and the physical downlink data channel by setting the delta_ss parameter for the sequence hopping to zero.

In FIG. 16, the physical downlink control channel indicates either PDCCH or EPDCCH.

In the process of controlling the transmission of the sounding reference signal by the terminal, the terminal receives a physical downlink data channel including a physical downlink control channel and an RRC parameter from the first base station (S1710), and the physical downlink control channel or the A sounding reference signal is generated by applying any one of information included in a physical downlink data channel, a sequence of a physical uplink control channel to be transmitted to the second base station, or a sequence of a physical uplink data channel to be transmitted to the second base station. S1720). The sounding reference signal is transmitted to the second base station (S1730).

In the embodiments 1-1 and 1-2, the UE is applied to the sequence group index and sequence index received before receiving the physical downlink control channel and the physical downlink data channel or to the RRC message transmitted by the physical downlink. A sounding reference signal is generated by applying an included SRS sequence group index and sequence index or a UE-specific virtual cell ID or delta_ss capable of generating the SRS sequence group index and sequence index. In this process, when generating aperiodic / periodic sounding reference signals, the same sequence group index and sequence index may be applied (Example 1-1) or independent sequence group indexes and sequence indexes may be applied (Example 1-2). Example).

In embodiments 2-1 and 3-1, the UE generates a sounding reference signal by applying any one of the physical uplink control channel sequence and the physical uplink data channel sequence, and performs the physical uplink control channel or physical uplink. The link data channel and the sounding reference signal are transmitted to the second base station.

In embodiments 2-2 and 3-2, the UE generates aperiodic sounding reference signal by applying any one of the physical uplink control channel sequence and the physical uplink data channel sequence to generate the physical uplink control channel or the like. A physical uplink data channel and the aperiodic sounding reference signal are transmitted to the second base station, and a periodic sounding reference signal is transmitted to the first base station.

By applying the parameter setting method, the first base station sets the delta_ss parameter for sequence hopping to zero, and the terminal may apply the delta_ss parameter to zero.

In FIG. 17, the physical downlink control channel indicates either PDCCH or EPDCCH.

18 is a diagram illustrating a configuration of a first base station according to another embodiment. The first base station includes a cell / base station / RRH / antenna / RU (Radio Unit) / Low Power Node (LPN) / point which transmitted a downlink control channel.

Referring to FIG. 18, a base station 1800 according to another embodiment includes a controller 1810, a transmitter 1820, and a receiver 1830.

The controller 1810 controls the overall operation of the base station according to the CoMP operation and the transmission of the uplink reference signal required to perform the above-described present invention.

The transmitter 1820 and the receiver 1830 are used to transmit and receive signals, messages, and data necessary for carrying out the present invention.

In more detail, the controller 1810 determines the sequence information of the signal to be received by the second base station to receive the sounding reference signal of the terminal, the transmitter 1820 includes the sequence information to the terminal or the sequence information A physical downlink data channel including a physical downlink control channel and an RRC parameter indicating a is transmitted.

The physical downlink control channel or the physical downlink data channel is information required for the terminal to transmit the sounding reference signal to a second base station, a sequence of a physical uplink control channel to be transmitted to the second base station, or the second It includes a sequence of physical uplink data channels to be transmitted to the base station.

In the embodiments 1-1 and 1-2, the transmitter 1820 is configured to perform SRS sequence group index and sequence index or SRS sequence group index and sequence index before transmitting the physical downlink control channel and the physical downlink data channel. SRS sequence group is transmitted to a UE-specific virtual cell ID or delta_ss that can be generated, or the control unit 1810 transmits a radio resource control (RRC) message transmitted by the physical downlink. It may include a UE-specific virtual cell ID or delta_ss for generating an index and sequence index or an SRS sequence group index and a sequence index.

In the embodiments 2-2 and 3-2, the receiver 1830 receives the periodic sounding reference signal from the terminal. That is, in embodiments 2-2 and 3-2, the UE generates aperiodic sounding reference signal by applying either the physical uplink control channel sequence or the physical uplink data channel sequence to control the physical uplink. A channel or a physical uplink data channel and the aperiodic sounding reference signal are transmitted to the second base station, and a periodic sounding reference signal is transmitted to the first base station.

In order to apply the parameter setting method, the controller 1810 may control the transmitter 1820 to transmit the physical downlink control channel and the physical downlink data channel by setting the delta_ss parameter for the sequence hopping to zero.

In the description of FIG. 18, the physical downlink control channel indicates either PDCCH or EPDCCH.

Referring to FIG. 19, a user terminal 1900 according to another embodiment includes a receiver 1930, a controller 1910, and a transmitter 1920.

The receiver 1930 receives downlink control information, data, and a message from a base station through a corresponding channel.

In addition, the controller 1910 controls the overall operation of the UE according to the CoMP operation and the transmission of the uplink reference signal required to perform the above-described present invention.

The transmitter 1920 transmits uplink control information, data, and a message to a base station through a corresponding channel.

Looking at the operation of each component of the user terminal according to the application of the present invention.

The receiver 1930 receives a physical downlink data channel including a physical downlink control channel and an RRC parameter from a first base station, and the controller 1910 is included in the physical downlink control channel or the physical downlink data channel. A sounding reference signal is generated by applying any one of information, a sequence of a physical uplink control channel to be transmitted to the second base station, or a sequence of a physical uplink data channel to be transmitted to the second base station. The transmitter 1920 transmits the sounding reference signal to the second base station.

In the embodiments 1-1 and 1-2, the control unit 1910 receives the sequence group index and sequence index or SRS sequence group index received before the receiving of the physical downlink control channel and the physical downlink data channel. And a sounding reference signal may be generated by applying a UE-specific virtual cell ID or delta_ss capable of generating a sequence index, or included in an RRC message transmitted by the physical downlink. The sounding reference signal may be generated by applying the UE sequence-specific virtual cell ID or delta_ss for generating the sequence group index and sequence index or the SRS sequence group index and sequence index. The controller 1910 may apply the same sequence group index and sequence index when generating an aperiodic / periodic sounding reference signal (Example 1-1) or may apply sequence group indexes and sequence indexes that are independent of each other. -2 example).

In the embodiments 2-1 and 3-1, the controller 1910 generates a sounding reference signal by applying any one of the physical uplink control channel sequence and the physical uplink data channel sequence. The 1920 may transmit the physical uplink control channel or the physical uplink data channel and the sounding reference signal to the second base station.

In the embodiments 2-2 and 3-2, the controller 1910 generates either a periodic sounding reference signal by applying any one of the physical uplink control channel sequence and the physical uplink data channel sequence. The transmitter 1920 may transmit the physical uplink control channel or the physical uplink data channel and the aperiodic sounding reference signal to the second base station, and may transmit the periodic sounding reference signal to the first base station.

The first base station sets the delta_ss parameter for sequence hopping to 0 by applying a parameter setting method, and the controller 1910 may apply the delta_ss parameter for sequence hopping to zero.

In the description of FIG. 19, the physical downlink control channel indicates either PDCCH or EPDCCH.

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

CROSS-REFERENCE TO RELATED APPLICATIONCROSS-REFERENCE TO RELATED APPLICATION

This patent application is filed with US Patent Act No. 119 on Patent Application No. 10-2012-0089255 filed in Korea on August 16, 2012 and Patent Application No. 10-2013-0085238 filed in Korea on July 19, 2013 Priority is claimed under section (a) (35 USC § 119 (a)), all of which is incorporated by reference in this patent application. In addition, if this patent application claims priority for the same reason for countries other than the United States, all its contents are incorporated into this patent application by reference.

Claims

In the method for the first base station to control the transmission of the sounding reference signal of the terminal,

Determining sequence information of a signal to be received by a second base station to receive a sounding reference signal of the terminal; And

A physical downlink shared channel including a physical downlink control channel (RN) and a radio resource control (RRC) parameter including the sequence information or indicating the sequence information to the terminal; Sending a step,

The physical downlink control channel or the physical downlink data channel is information required for the terminal to transmit the sounding reference signal to a second base station, or a physical uplink control channel to be transmitted to the second base station (Physical Uplink Control CHannel) Or a sequence of physical uplink shared channels to be transmitted to the second base station.
The method of claim 1,

The first base station is

Prior to transmitting the physical downlink data channel including the physical downlink control channel and the RRC parameter, a sequence group index and a sequence index are transmitted, or in a radio resource control (RRC) message transmitted by the physical downlink. And including the sequence group index and the sequence index.
The method of claim 1,

Receiving a periodic sounding reference signal from the terminal.
The method of claim 1,

The transmitting step

And setting a delta_ss parameter for the sequence hopping to 0 to transmit a physical downlink control channel and a physical downlink data channel.
In the method for the terminal to control the transmission of the sounding reference signal,

Receiving a physical downlink shared channel including a physical downlink control channel and a radio resource control (RRC) parameter from a first base station;

Information included in the physical downlink control channel or the physical downlink data channel, a sequence of a physical uplink control channel to be transmitted to a second base station, or a physical uplink data channel to be transmitted to the second base station Generating a sounding reference signal by applying any one of a sequence of Uplink Shared CHannel; And

Transmitting the sounding reference signal to the second base station.
The method of claim 5,

Generating the sounding reference signal

The sequence group index and the sequence index received before the step of receiving the physical downlink data channel including the physical downlink control channel and the RRC parameters or included in the radio resource control (RRC) message transmitted by the physical downlink Generating a sounding reference signal by applying the sequence group index and the sequence index.
The method of claim 5,

Generating the sounding reference signal

Generating a sounding reference signal by applying any one of the physical uplink control channel sequence and the physical uplink data channel sequence;

The step of transmitting the sounding reference signal to the second base station

Transmitting the physical uplink control channel or the physical uplink data channel and the sounding reference signal to the second base station.
The method of claim 5,

Generating the sounding reference signal

Generating aperiodic sounding reference signal by applying any one of the physical uplink control channel sequence and the physical uplink data channel sequence;

The step of transmitting the sounding reference signal to the second base station

Transmitting the physical uplink control channel or the physical uplink data channel and the aperiodic sounding reference signal to the second base station; And

Transmitting a periodic sounding reference signal to the first base station.
The method of claim 5,

The generating step

Applying a delta_ss parameter for sequence hopping to zero.
A controller configured to determine sequence information of a signal to be received by a second base station to receive a sounding reference signal of the terminal; And

A physical downlink shared channel including a physical downlink control channel (RN) and a radio resource control (RRC) parameter including the sequence information or indicating the sequence information to the terminal; It includes a transmitting unit for transmitting,

The physical downlink control channel or the physical downlink data channel is information required for the terminal to transmit the sounding reference signal to a second base station, or a physical uplink control channel to be transmitted to the second base station (Physical Uplink Control CHannel) Or a sequence of physical uplink shared channels to be transmitted to the second base station.
The method of claim 10,

The transmitter transmits a sequence group index and a sequence index before transmitting the physical downlink data channel including the physical downlink control channel and the RRC parameter,

Or the control unit includes a sequence group index and a sequence index in an RRC (Radio Resource Control) message transmitted by the physical downlink.
The method of claim 10,

The base station further comprises a receiving unit for receiving a periodic sounding reference signal from the terminal.
The method of claim 10,

And the control unit controls the transmitter to transmit a physical downlink control channel and a physical downlink data channel by setting a delta_ss parameter for the sequence hopping to zero.
A receiver configured to receive a physical downlink shared channel including a physical downlink control channel and a radio resource control (RRC) parameter from a first base station;

Information included in the physical downlink control channel or the physical downlink data channel, a sequence of a physical uplink control channel to be transmitted to a second base station, or a physical uplink data channel to be transmitted to the second base station A control unit generating a sounding reference signal by applying any one of a sequence of Uplink Shared CHannel; And

And a transmitter for transmitting the sounding reference signal to the second base station.
The method of claim 14,

The control unit

The sequence group index and the sequence index received before the step of receiving the physical downlink data channel including the physical downlink control channel and the RRC parameters or included in the radio resource control (RRC) message transmitted by the physical downlink And generating a sounding reference signal by applying the sequence group index and the sequence index.
The method of claim 14,

The controller generates a sounding reference signal by applying any one of the physical uplink control channel sequence and the physical uplink data channel sequence.

The transmitter is characterized in that for transmitting the physical uplink control channel or physical uplink data channel and the sounding reference signal to the second base station.
The method of claim 14,

The controller generates one aperiodic sounding reference signal by applying either the physical uplink control channel sequence or the physical uplink data channel sequence.

The transmitter transmits the physical uplink control channel or the physical uplink data channel and the aperiodic sounding reference signal to the second base station, and transmits a periodic sounding reference signal to the first base station. .
The method of claim 14,

The control unit applies a delta_ss parameter for sequence hopping to 0.