KR20140004562A

KR20140004562A - Methods and apparatuses of implementing random access for uplink timing adjustment

Info

Publication number: KR20140004562A
Application number: KR1020130047141A
Authority: KR
Inventors: 박규진
Original assignee: 주식회사 케이티
Priority date: 2012-07-02
Filing date: 2013-04-29
Publication date: 2014-01-13

Abstract

The present invention relates to a method and an apparatus for transmitting an uplink sounding reference signal in the deployment of a CoMP scenario 4 or a CoMP scenario 3 and a heterogamous network. A method for implementing a random access for uplink timing adjustment by a transmission point includes a step for generating first setting information required for performing the random access and the reception point of a terminal, and a step for transmitting a first signal including the first setting information required for performing the random access of the terminal. Command information for performing the random access on the terminal includes a firs signal and a second signal after the first signal is transmitted. [Reference numerals] (701) Transmission point; (709) Terminal; (S710) Generating first setting information required for performing the random access of the terminal and the reception point; (S712) Transmitting a first signal including the first setting information; (S720) Transmitting a second signal to command the performing of the random access; (S730) Performing a random access procedure by using the first setting information and the command information included in the first signal or the second signal

Description

Method and Apparatus for Implementing Random Access for Uplink Timing Adjustment

The present invention provides an eNB / RU / RRH as a transmission point (TP) for a downlink physical channel and a signal for an arbitrary terminal and a reception point (RP) for an uplink physical channel and a signal of the corresponding terminal. When eNB / RU / RRH is configured separately, the present invention relates to a cell-specific PRACH resource resetting scheme for a corresponding UE.

The present invention relates to a random access procedure for uplink TA coordination of any connected UE. In particular, the eNB / RU / RRH set to TP and the eNB / RU / RRH set to RP are different from each other. In this case, the present invention relates to PRACH configuration information that is a basis for interpretation of preamble index and PRACH MASK index information allocated by a PDCCH order.

In order to solve the above problems, the present invention provides the terminal with information necessary for the transmission point to perform a random access process between the reception point and the terminal in order to implement random access for uplink synchronization adjustment.

More specifically, the transmission point provides the terminal with new configuration information necessary for the random access process between the reception point and the terminal and instructs the terminal with random access based on the new configuration information, and the terminal receives the new configuration information and transmits it. A random access procedure is performed with the receiving point according to the instruction of the point.

According to an embodiment of the present invention, in a method in which a transmission point implements random access for uplink synchronization adjustment, the terminal generates first configuration information necessary for performing random access with the reception point of the terminal; and And transmitting a first signal including first configuration information necessary for performing random access to the terminal, wherein the indication information for instructing the terminal to perform the random access includes the first signal or the first signal. It is characterized in that it is included in the second signal transmitted later.

According to another embodiment of the present invention, a method for implementing random access for uplink synchronization adjustment in a terminal, the method comprising: receiving a first signal including first configuration information necessary for performing random access from a transmission point, and Performing random access with a reception point by using the indication information included in the first signal or the indication information included in the second signal received from the transmission point and the first setting information after receiving the first signal. It includes.

According to still another embodiment of the present invention, in a transmission point for implementing random access for uplink synchronization adjustment, a reception unit for receiving a signal from a terminal, and a first terminal necessary for the terminal to perform random access with the reception point of the terminal A control unit for generating configuration information, and a transmission unit for transmitting a first signal including first configuration information necessary for performing random access to the terminal, wherein the instruction information for instructing the terminal to perform the random access includes the first information. And a second signal transmitted after the first signal or the first signal.

According to still another embodiment of the present invention, a terminal for implementing random access for uplink synchronization adjustment includes: a receiving unit and a receiving point for receiving a first signal including first configuration information necessary for performing random access from a transmission point And a control unit for controlling the receiving unit and the transmitting unit to perform random access with the reception point using the first setting information, wherein the control unit includes the indication information included in the first signal or The transmitter may be configured to perform random access with the reception point by using the indication information and the first configuration information included in the second signal received from the transmission point after receiving the first signal.

According to the present invention, since the transmission point provides the terminal with information necessary for the random access process between the reception point and the terminal, the random access procedure can be performed based on the configuration information suitable for the reception point and the terminal.

In more detail, since the transmission point provides the terminal with new configuration information necessary for the random access process between the reception point and the terminal and instructs the terminal with random access based on the new configuration information, the terminal receives the new configuration information and the transmission point. A random access procedure may be performed with the reception point according to the indication of.

1 is a diagram illustrating a conventional uplink / downlink data transmission scheme.
FIG. 2 is a diagram illustrating an independent uplink / downlink path establishment scheme (uplink link reset technique).
3 illustrates a process of using a UE specific PRACH reconfiguration message according to an embodiment of the present invention.
4 illustrates a process of using a UE-specific PRACH reconfiguration message according to another embodiment of the present invention.
5 is a diagram illustrating a process of using a UE-specific PRACH reconfiguration message according to another embodiment of the present invention.
6 is a diagram illustrating a process of indicating a random access procedure by higher layer signaling according to an embodiment of the present invention.
7 is a diagram illustrating a process of implementing random access between a transmission point and a terminal according to an embodiment of the present invention.
8 illustrates a process of implementing random access at a transmission point according to an embodiment of the present invention.
9 is a diagram illustrating a process of implementing random access in a transmission point according to another embodiment of the present invention.
10 is a diagram illustrating a process of implementing random access in a terminal according to an embodiment of the present invention.
11 is a diagram illustrating a process of implementing random access in a terminal according to an embodiment of the present invention. 5 includes a case-C of FIG. 5 and a case-D embodiment of FIG. 6.
12 is a diagram illustrating a configuration of a transmission point for implementing random access for uplink synchronization adjustment according to an embodiment of the present invention.
13 is a diagram illustrating a configuration of a terminal implementing random access for uplink synchronization adjustment according to an embodiment of the present invention.

Hereinafter, some embodiments of the present invention will be described in detail with reference to exemplary drawings. It should be noted that, in adding reference numerals to the constituent elements of the drawings, the same constituent elements are denoted by the same reference symbols as possible even if they are shown in different drawings. In the following description of the present invention, a detailed description of known functions and configurations incorporated herein will be omitted when it may make the subject matter of the present invention rather unclear.

In describing the components of the present invention, terms such as first, second, A, B, (a), and (b) may be used. These terms are intended to distinguish the constituent elements from other constituent elements, and the terms do not limit the nature, order or order of the constituent elements. When a component is described as being "connected", "coupled", or "connected" to another component, the component may be directly connected or connected to the other component, Quot; may be "connected,""coupled," or "connected. &Quot;

The wireless communication system in the present invention is widely deployed to provide various communication services such as voice, packet data and the like. A wireless communication system includes a user equipment (UE) and a base station (BS, or eNB). In the present specification, a user terminal is a generic concept meaning a terminal in wireless communication. In addition, user equipment (UE) in WCDMA, LTE, and HSPA, as well as mobile station (MS) in GSM, user terminal (UT), and SS It should be interpreted as a concept that includes a subscriber station, a wireless device, and the like.

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 Base Transceiver System, Access Point, Relay Node.

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. It is meant to cover various coverage areas such as megacell, macrocell, microcell, picocell, femtocell and relay node communication range.

Herein, the user terminal and the base station are used in a broad sense as the two transmitting and receiving subjects used to implement the technical or technical idea described in this specification, and are not limited by a specific term or word. The user terminal and the base station are used in a broad sense as two (uplink or downlink) transmitting and receiving subjects used to implement the technology or technical idea described in the present invention, and are not limited by a specific term or word. 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 are no restrictions on multiple access schemes applied to wireless communication systems. Various multiple access schemes such as Code Division Multiple Access (CDMA), Time Division Multiple Access (TDMA), Frequency Division Multiple Access (FDMA), Orthogonal Frequency Division Multiple Access (OFDMA), OFDM-FDMA, OFDM- Can be used. An embodiment of the present invention can be applied to asynchronous wireless communication that evolves into LTE and LTE-advanced via GSM, WCDMA, and HSPA, and synchronous wireless communication that evolves into CDMA, CDMA-2000, and UMB. The present invention should not be construed as limited to or limited to a specific wireless communication field and should be construed as including all technical fields to which the idea of the present invention can be applied.

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

In 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. The uplink and downlink transmit control information through a control channel such as a Physical Downlink Control Channel (PDCCH), a Physical Control Format Indicator CHannel (PCFICH), a Physical Hybrid ARQ Indicator CHannel (PHICH), and a Physical Uplink Control CHannel And a data channel such as a Physical Downlink Shared CHannel (PDSCH), a Physical Uplink Shared CHannel (PUSCH), and the like.

In this specification, a cell refers to a component carrier having a coverage of a signal transmitted from a transmission point or a transmission point or transmission / reception point of a signal transmitted from a transmission / reception point, and a transmission / reception point itself .

The wireless communication system to which the embodiments are applied may be a coordinated multi-point transmission / reception system (CoMP system) or a coordinated multi-point transmission / reception system in which two or more transmission / reception points cooperatively transmit signals. antenna transmission system, or a cooperative multi-cell communication system. A CoMP system may include at least two multipoint transmit and receive points and terminals.

The multi-point transmission / reception point includes a base station or a macro cell (hereinafter referred to as 'eNB'), and at least one mobile station having a high transmission power or a low transmission power in a macro cell area, Lt; / RTI >

Hereinafter, a downlink refers to a communication or communication path from a multipoint transmission / reception point to a terminal, and an uplink refers to a communication or communication path from a terminal to a multiple transmission / reception point. In downlink, a transmitter may be part of multiple transmission / reception points, and a receiver may be part of a terminal. In the uplink, the transmitter may be a part of the terminal, and the receiver may be a part of multiple transmission / reception points.

Hereinafter, a situation in which a signal is transmitted / received through a channel such as PUCCH, PUSCH, PDCCH, and PDSCH is expressed as 'PUCCH, PUSCH, PDCCH and PDSCH are transmitted and received'.

The eNB performs downlink transmission to the UEs. The eNB includes a physical downlink shared channel (PDSCH) as a main physical channel for unicast transmission, downlink control information such as scheduling required for reception of a PDSCH, A physical downlink control channel (PDCCH) for transmitting scheduling grant information for transmission in a Physical Uplink Shared Channel (PUSCH). Hereinafter, the transmission and reception (ie, transmission and reception) of signals through each channel will be described in the form of transmission and reception (ie, transmission and reception) of the corresponding channel. In addition, the reference signal (Reference Signal) is represented by RS, and the sounding reference signal (Sounding Reference Signal) is represented by SRS.

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.

PRACH for random access preamble transmission for TA (Timing Alignment) measurement, which is uplink synchronization information between eNB / RU (Radio Unit) / RRH (Remote Radio Head) and UE in 3GPP LTE / LTE-A system Physical Random Access CHannel) is transmitted to the UE through the following two types of higher layer signaling. The upper layer signaling uses RRC (Radio Resource Control) according to an embodiment.

1) PRACH-ConfigSIB Information Element (IE) of System Information Block 2 (SIB2) for each cell

2) PRACH-Config IE included in mobilityControlInfo in RRCConnectionReconfiguration message

The transmission of the PRACH configuration information through the RRCConnectionReconfiguration message of 2) is limited to the purpose of transmitting the PRACH configuration information of the target cell according to the handover of the UE, and 1) SIB2 It is defined that all random access procedures are performed in the cell according to the cell-specific PRACH configuration information transmitted through the cell-specific PRACH configuration information. That is, the TA performs an initial network entry procedure for establishing a connection with an arbitrary cell or a TA with a serving cell currently connected through reception of a PDCCH order. The UEs performing the random access procedure for the adjustment transmit the random access preamble according to the PRACH-configSIB configuration information of the SIB2.

Table 1 describes the IE of the PRACH-configSIB. The UE uses the PRACH-configindex and PRACH-frequency offset, which is a root sequence for generating a random access preamble and PRACH time / frequency resource allocation information. offset) information is received.

Configuration of PRACH-configSIB PRACH-ConfigSIB :: = SEQUENCE {
rootSequenceIndex INTEGER (0..837),
prach-ConfigInfo PRACH-ConfigInfo
}
PRACH-ConfigInfo :: = SEQUENCE {
prach-ConfigIndex INTEGER (0..63),
highSpeedFlag BOOLEAN,
zeroCorrelationZoneConfig INTEGER (0..15),
prach-FreqOffset INTEGER (0..94)
}

The UE performs a random access procedure in the cell based on the PRACH-configSIB information, and defines a physical random access channel structure and a random access preamble defined according to the PRACH configuration information by the RRC. The random access preamble generation method and the operation of the terminal related thereto are implemented to be suitable for implementing a communication system such as an LTE or LTE-A system.

PDCCH Instruction-based random access procedure ( PDCCH order based random access procedure )

As described above, the 3GPP LTE / LTE-A system defines a random access procedure for adjusting uplink TA value for an arbitrary UE. To this end, eNB / RU / RRH constituting an arbitrary cell configures a dedicated random access preamble index for a terminal in the cell and a PRACH resource index for transmitting the corresponding preamble. It may be allocated to the corresponding terminal through the PDCCH. PDCCH format 1A is used for a dedicated random access preamble procedure through the PDCCH indication. The eNB / RU / RRH transmits preamble index information and PRACH mask index information for the UE through PDCCH format 1A scrambled with the C-RNTI of the UE. The UE transmits the random access preamble allocated through the preamble index through the PRACH resource index defined in Table 2 according to the PRACH mask index setting. As an embodiment for transmitting the corresponding PDCCH indication, DCI format 1A may be used, and generation and transmission of the PDCCH indication are implemented to be suitable for implementing a communication system such as an LTE or LTE-A system.

PRACH mask index PRACH mask index Allowed PRACH (FDD) Allowed PRACH (TDD) 0 all all One PRACH Resource Index 0 PRACH Resource Index 0 2 PRACH Resource Index 1 PRACH Resource Index 1 3 PRACH Resource Index 2 PRACH Resource Index 2 4 PRACH Resource Index 3 PRACH Resource Index 3 5 PRACH Resource Index 4 PRACH Resource Index 4 6 PRACH Resource Index 5 PRACH Resource Index 5 7 PRACH Resource Index 6 Reserved 8 PRACH Resource Index 7 Reserved 9 PRACH Resource Index 8 Reserved 10 PRACH Resource Index 9 Reserved 11 In the time domain, all even PRACH opportunities in the first PRACH index subframe In the time domain, all even PRACH opportunities in the first PRACH index subframe 12 In the time domain, all odd PRACH opportunities in the first PRACH index subframe In the time domain, all odd PRACH opportunities in the first PRACH index subframe 13 Reserved First PRACH Index in Subframe 14 Reserved Second PRACH Index in Subframe 15 Reserved 3rd PRACH index of subframe

1 is a diagram illustrating a conventional uplink / downlink data transmission scheme. FIG. 2 is a diagram illustrating an independent uplink / downlink path establishment scheme (uplink link reset technique).

As shown in FIG. 1, an eNB / RU / RRH as a downlink physical channel for a certain terminal and a transmission point (TP) for transmitting a physical signal, and an RP (Reception) for receiving an uplink physical channel and a physical signal of the corresponding terminal Point / Receive Point) is the same as eNB / RU / RRH. That is, the macro node 110 serves as the TP and the RP with respect to the terminal 112. The macro node 110 transmits a PDCCH and / or PDSCH (PDCCH And / or PDSCH) to the terminal 112, and the terminal 112 transmits a PUSCH / PUCCH / SRS and a related RS (PUSCH / PUCCH / SRS And related RS). Send it. In addition, the pico node 120 for the terminals 122 and 124 also serves as TP and RP. The cell ID of the macro node 110 is # 1, and the cell ID of the pico node 120 is # 2.

FIG. 2 is a diagram illustrating an independent uplink / downlink path establishment technique (uplink link reconfiguration technique) to which an embodiment of the present invention is applied. In FIG. 2, the cell ID of the macro node 210 is # 1, and the cell ID of the pico node 220 is # 2. As shown in FIG. 2, eNB / RU / RRH as TP and eNB / RU / RRH as RP may be separately configured in various CoMP scenarios. For the UE 212 located in the macro cell terminal or the pico / micro cell boundary region, the downlink physical channel and the physical signals (PDCCH and / or PDSCH) may be used for the macro cell eNB / RU / RRH 210. Received from and transmitting uplink physical channels and physical signals (PUSCH / PUCCH / SRS and associated RS) to the pico / micro cell eNB / RU / RRH 220 is effective in reducing interference and uplink power consumption for the uplink. It can be a way.

In this case, however, eNB / RU / RRH transmitting SIB2 including configuration information on a physical random access channel and transmitting a PDCCH indication for initializing a random access procedure of a corresponding UE based on the SIB2 (see FIG. 2). There is a mismatch between the 210) and the eNB / RU / RRH (220 of FIG. 2) receiving the actual random access preamble. That is, the actual UE should transmit the random access preamble according to the cell-specific PRACH configuration information configured in the eNB / RU / RRH set to RP, which is a TA value adjusting entity for uplink synchronization, Since the random access preamble is transmitted according to the cell-specific PRACH configuration information configured in the existing TP, there may be a problem in receiving it in the corresponding RP.

In the present invention, the eNB / RU / RRH as the TP and the eNB / RU / RRH as the RP redefine the random access procedure of the UE configured differently, and thus the eNB / RU / RRH for initializing the random access procedure for the corresponding UE. It is intended to solve the ambiguity in the random access procedure that may occur due to a mismatch between eNB / RU / RRH that should receive the actual random access preamble.

With the introduction of MTC (Machine Type Communication) and the spread of smart phones, the number of terminals requiring wireless connection is increasing rapidly, and the demand for supporting high data transmission rate by terminal is increasing rapidly. In this environment, the efficiency of frequency reuse can be maximized by separating the DU (Digital Unit) and RU / RRH to form independent cells to efficiently manage allocated radio resources and support high data rates. . In addition, due to transmission power imbalance between eNB / RU / RRHs, heterogeneous network scenarios appearing in various cell sizes or various cell sizes covered by each eNB / RU / RRH are becoming common. In this environment, various cooperative communication techniques between eNB / RU / RRHs and even uplink / downlink linkage imbalance between the eNB / RU / RRHs to guarantee high data rates even for UEs located in a cell boundary region (that is, arbitrary There is a need for an eNB / RU / RRH as a Transmission Point (TP) for transmitting a downlink signal for a UE and an eNB / RU / RRH as an RP (Reception Point) for receiving an uplink signal from a corresponding UE). .

However, when eNB / RU / RRH as TP for downlink physical channel and physical signal transmission to the terminal and eNB / RU / RRH as RP for receiving uplink physical channel and physical signal from the terminal are separately configured, Unlike the scenario in which the same eNB / RU / RRH operates as TP and RP, ambiguity may occur on uplink physical channel and physical signal transmission. That is, configuration information related to uplink physical channel and physical signal transmission is received from eNB / RU / RRH, which is TP, whereas actual uplink physical channel and physical signal are transmitted to eNB / RU / RRH set to RP. Inconsistency between uplink transmission-related configuration information and uplink transmission from an actual terminal may occur.

In this regard, the present invention proposes a UE-specific PRACH reconfiguration scheme for resolving ambiguity between the PRACH configuration information for uplink synchronization of a UE and a random access procedure based on the same. do.

In order to re-establish TA value, which is uplink synchronization information for an arbitrary UE, a random access procedure of the UE may be initialized by transmitting a PDCCH indication from eNB / RU / RRH of a cell to which the UE belongs. The PDCCH indication includes preamble index information, which is dedicated PRACH preamble allocation information for a random access procedure of the UE, and PRACH mask index information, which is PRACH resource index information for transmitting the preamble. Upon receiving the PDCCH indication, the UE transmits the preamble allocated based on the preamble index information and the PRACH mask index information through the allocated PRACH resource. However, the preamble index and the PRACH resource index are interpreted based on PRACH-related parameters included in the PRACH-configSIB IE configured through cell-specific SIB2. That is, even if the same preamble index and the PRACH resource index value are received through the PDCCH indication, in case of a UE belonging to a different cell, the random access preamble transmitted on the random access procedure according to the PRACH configuration information set for the cell specificly; Subframes and frequency bands for transmitting the preamble may be different from each other. Since the interpretation of the preamble index and the PRACH mask index transmitted through the PDCCH indication is based on cell specific PRACH configuration information, when the eNB / RU / RRH as TP and RP are different from each other, the cell specific PRACH configuration information of the RP is different. The PDCCH indication is transmitted on the basis of, and the terminal should be defined to interpret the PDCCH indication on the basis of this. However, since the UE receives corresponding cell-specific PRACH configuration information through SIB2 of eNB / RU / RRH, which is a TP, ambiguity occurs in the random access procedure based on the PDCCH indication.

Hereinafter, embodiments of the present invention in which a transmission point provides information necessary for a random access process between a reception point and a terminal to a terminal and performs a random access procedure based on configuration information suitable for the reception point and the terminal will be described. .

In more detail, the transmission point provides the terminal with new configuration information necessary for the random access process between the reception point and the terminal and instructs the terminal with random access based on the new configuration information. The terminal may receive the new configuration information and perform a random access procedure with the reception point according to the indication of the transmission point. Meanwhile, in the present specification, a transmission point does not mean only having a transmission function, but includes a transmission / reception function, and is named as a transmission point in that the reception point receives a random access preamble signal in the random access process of the present invention. Points have both the functions of transmitting and receiving signals. One embodiment of the transmission point may be an eNB, RU, or RRH.

The present invention proposes the following two embodiments to solve this problem. In addition, in FIGS. 3 to 6, the first cells 301, 401, 501, and 601 transmit a PDCCH like a macro node and include an eNB / RU / RRH as a TP as a transmission point. The second cell 302, 402, 502, 602 includes an eNB / RU / RRH as an RP that is a receiving point, such as a pico node. Meanwhile, although one embodiment of MAC signaling includes MAC CE signaling, the present invention is not limited thereto. In addition, the parameters required to initialize the random access procedure includes all or part of the parameters of Table 1, and may include new parameters depending on the system implementation.

Example One: UE Specific PRACH reset( UE - specific PRACH reconfiguration )

In Embodiment 1, as a ambiguity solution for the PDCCH indication based random access procedure, UE-specific PRACH reconfiguration (UE-), which is a higher layer (RRC) signaling message for resetting PRACH configuration parameters for each UE, is performed. The specific PRACH reconfiguration message is newly defined. The UE-specific PRACH reconfiguration message includes all or part of the PRACH configuration-related parameters rootSequenceIndex, PRACH-ConfigInfo (prach-ConfigIndex, highSpeedFlag, zeroCorrelationZoneConfig, prach-FreqOffset) which are set through the system information. Can be defined as a message. The PRACH configuration related parameters included in the UE specific PRACH reconfiguration message include configuration information set in the RP, which is a TA value adjustment subject. Upon receiving the UE-specific PRACH reconfiguration message, the UE ignores the PRACH configuration information set through the existing system information and resets the UE according to the value set in the UE-specific PRACH reconfiguration message. Accordingly, when the UE receiving the UE-specific PRACH reconfiguration message performs a random access procedure through the subsequent PDCCH indication, the UE interprets the preamble index and the PRACH mask index included in the PDCCH indication through the UE-specific PRACH reconfiguration message. Based on the newly set information, the random access procedure is performed based on this information.

Alternatively, the value set by the existing system information is maintained, but UE-specific PRACH resetting information is additionally stored and based on different PRACH configurations according to an event in which a random access procedure is initialized. It can be defined to perform a random access procedure. For example, when initialized by a MAC layer (Media Access Control layer), to perform a random access procedure based on the cell-specific PRACH configuration information by the existing system information, and when initialized by the PDCCH indication UE It may be defined to perform a random access procedure based on specific PRACH configuration information. Alternatively, when random access procedure initiation based on PDCCH indication is performed, an instruction or indication is performed based on the cell-specific PRACH configuration or UE-specific PRACH reconfiguration information. By defining a 1 bit information field (bit information field), it can be defined to be transmitted along with the preamble index and PRACH MASK index information to the terminal.

3 illustrates a process of using a UE specific PRACH reconfiguration message according to an embodiment of the present invention.

Based on the above-described Embodiment 1, the terminal receives the UE-specific PRACH reset message, the terminal ignores the PRACH configuration information set through the existing system information, and resets it according to the value set in the UE-specific PRACH reset message An example is shown. 3 is referred to as a case-A embodiment.

The first cell 301 transmits a UE specific PRACH reconfiguration message to the terminal 309 (S312). The terminal 309 stores the configuration information included in the received PRACH reconfiguration message (S314). That is, the information is reset using the configuration information of the UE specific PRACH reconfiguration message instead of the previously set PRACH configuration information. Then, when the first cell 301 indicates the random access procedure, for example, when the PDCCH indication method is indicated (S322), the UE 309 interprets the preamble index and the PRACH mask index included in the PDCCH indication. In performing, based on the information set in the UE-specific PRACH reconfiguration message (S324). The terminal 309 determines a random access preamble and a subframe and frequency band for transmitting the preamble based on the PRACH reconfiguration message configuration information. The terminal 309 performs a random access procedure with the second cell 302 based on the interpretation (S330).

In FIG. 3, the random access procedure is initialized by the PDCCH indication in step S322, but this is only an example and may be initialized by MAC layer signaling. In this case, the UE may check the preamble index and the mask index included in the MAC layer signaling, and interpret the value based on the configuration information of the UE-specific PRACH reconfiguration message stored in S314 to perform a random access procedure. .

4 illustrates a process of using a UE-specific PRACH reconfiguration message according to another embodiment of the present invention.

Based on the first embodiment described above, FIG. 4 shows a case in which the UE retains both the previously set PRACH configuration information and the configuration information of the UE-specific PRACH reconfiguration message. 4 is referred to as the case-B embodiment.

The first cell 401 transmits a UE specific PRACH reconfiguration message to the terminal 409 (S412). The terminal 409 stores the configuration information included in the received PRACH reconfiguration message (S414). At this time, both the previously set PRACH configuration information and the configuration information of the UE-specific PRACH reconfiguration message are stored.

The first cell 401 indicates the random access procedure initialization by the MAC layer signaling (S422). The terminal 409 performs a random access procedure using cell-specific PRACH configuration information previously established for MAC layer signaling, that is, existing system information (S424). On the other hand, when the first cell 401 indicates the random access procedure initialization with the PDCCH indication (S432), the UE 409 performs UE specificity in interpreting the preamble index and the PRACH mask index included in the PDCCH indication. It performs based on the information set in the enemy PRACH reconfiguration message (S434). The terminal 409 determines a random access preamble and a subframe and frequency band for transmitting the preamble based on the configuration information of the PRACH reconfiguration message. The terminal 409 performs a random access procedure with the second cell 402 based on the interpretation (S440).

5 is a diagram illustrating a process of using a UE-specific PRACH reconfiguration message according to another embodiment of the present invention.

Based on the first embodiment described above, FIG. 5 shows a case in which the UE retains both the previously set PRACH configuration information and the configuration information of the UE-specific PRACH reconfiguration message as shown in FIG. 4. In addition, the procedure of S412 / S414 of FIG. 5 is the same as that of FIG. 4, and is replaced by the description of FIG. 4. The embodiment of FIG. 5 is referred to as the case-C embodiment.

Which configuration information is used to perform random access procedure initialization in a state in which the terminal 509 retains both the previously set PRACH configuration information and the configuration information of the UE-specific PRACH reset message is included in the PDCCH indicating the initialization. It is divided into information fields. For example, when the value of the information field (1 bit) included in the PDCCH is '0', the previously set PRACH configuration information is used, and when '1', the configuration information of the UE specific PRACH reconfiguration message is used. The random access procedure may be performed as in S540. The value of 0 or 1 indicates only an embodiment, and may indicate different configuration information held by the terminal according to an implementation method.

The first cell 501 indicates the random access procedure initialization by the PDCCH indication including the value of the information field '0' (S522). The terminal 509 performs a random access procedure by using cell-specific PRACH configuration information previously established, that is, existing system information (S524). On the other hand, if the first cell 501 indicates the random access procedure initialization by the PDCCH indication including the value of the information field '1' (S532), the UE 509 is a preamble index and PRACH mask index included in the PDCCH indication In performing the analysis on the basis of the information set in the UE-specific PRACH reconfiguration message (S534). The terminal 509 determines a random access preamble and a subframe and frequency band for transmitting the preamble based on the configuration information of the PRACH reconfiguration message. The terminal 509 performs a random access procedure with the second cell 502 based on the interpretation (S540).

3 to 5 in the UE-specific PRACH reconfiguration message is delivered to the terminal, the PRACH reconfiguration message may be provided to all the terminals included in a particular receiving point. For example, in FIG. 2, the terminals 224 and 222 using the pico node 220 as a reception point may receive PRACH reconfiguration information suitable for the pico node 220 from the macro node with the same contents. Thereafter, when the macro node initializes the random access procedure to the terminals 224 and 222, the macro node may set and indicate a preamble index and a PRACH mask index to be different between the terminal 224 and another terminal 222. Therefore, in the present specification, the UE-specific PRACH reconfiguration message is not necessarily the only PRACH configuration information held by the terminal, and includes PRACH configuration information that can be identically maintained between terminals having one reception point.

Example 2: Definition of higher layer order initiated random access procedure

Define a random access procedure based on MAC CE (Control Element) signaling or RRC signaling in addition to the PDCCH indication based random access procedure as a method for initializing a random access procedure for a terminal that is connected to an eNB / RU / RRH. do. In this case, the corresponding MAC CE signaling or RRC signaling performs a random access procedure of the corresponding UE based on the PRACH configuration along with the PRACH configuration related parameters rootSequenceIndex, PRACH-ConfigInfo (prach-ConfigIndex, highSpeedFlag, zeroCorrelationZoneConfig, and prach-FreqOffset) information. To include the preamble index value and PRACH MASK index value allocated for.

Upon receiving this, the UE receives the preamble index included in the same signaling based on the PRACH configuration information included in the corresponding higher layer (RRC or MAC) order signaling rather than the PRACH configuration information included in the existing SIB2. A random access procedure may be performed according to the PRACH MASK index value.

6 is a diagram illustrating a process of indicating a random access procedure by higher layer signaling according to an embodiment of the present invention.

The embodiment of FIG. 6 is called a case-D embodiment.

The first cell 601 indicates the random access procedure by MAC signaling or RRC signaling (S612). This signaling includes the PRACH configuration related parameters required to perform the random access procedure with the second cell 602. The terminal 609 interprets the preamble index and the PRACH mask index included in the signaling based on the configuration information included in the received signaling (S624). The terminal 609 determines a random access preamble and a subframe and frequency band for transmitting the preamble based on the PRACH configuration related parameters included in the signaling. In operation S630, a random access procedure is performed with the second cell 602 using the interpreted preamble index and the PRACH mask index.

7 is a diagram illustrating a process of implementing random access between a transmission point and a terminal according to an embodiment of the present invention.

FIG. 7 includes the case-A to case-D embodiments described with reference to FIGS. 3 to 6.

The transmission point 701 may provide first configuration information necessary for the terminal 709 to perform random access with the reception point of the terminal 709 in order to implement random access for uplink synchronization adjustment of the terminal 709. It generates (S710). The first configuration information is different from cell specific PRACH configuration information in which the transmission point 701 and the terminal 709 have been shared in advance, and are information required for the reception point and the terminal 709 to perform random access. The first setting information may be generated and stored in advance by the transmission point 701, or may be generated according to a reception situation of the reception point.

The transmission point 701 transmits a first signal including first configuration information necessary for performing random access to the terminal 709 (S712). Thereafter, the transmission point 701 transmits a second signal instructing to perform random access (S720). The transmission of the second signal is optional. In case of case-A, B, and C, the second signal is transmitted, and in case of case-D, the first signal includes information indicating execution of a random access.

The terminal 709 receives the first signal including the first setting information necessary for performing random access from the transmission point 701 and then receives the indication information or the first signal included in the first signal. Thereafter, a random access procedure is performed using the indication information included in the second signal received from the transmission point 701 and the first setting information (S730). The random access procedure may be performed with the reception point or transmission point described with reference to FIGS. 3 to 6. An embodiment of performing the information or the random access procedure of the first signal has been described with reference to Case-A to Case-D of FIGS. 3 to 6. The operations of the transmission point and the terminal will be described with reference to FIGS. 8 to 11.

8 illustrates a process of implementing random access at a transmission point according to an embodiment of the present invention. FIG. 3 includes a case-A of FIG. 3 and a case-B of FIG. 4.

The transmission point generates first configuration information necessary for the terminal to perform random access with the reception point, that is, the reception point of the terminal (S810). If it is case-A (S820), the transmission point transmits the UE-specific PRACH reconfiguration message including the first configuration information to the terminal by including the first signal (S830). The transmission point transmits the PDCCH indication or MAC layer signaling indicating the random access to the terminal as the second signal (S832). The indicating PDCCH indication or MAC layer signaling may include a preamble index and a PRACH mask index.

On the other hand, in case-B, the transmission point transmits the UE-specific PRACH reconfiguration message including the first configuration information in the first signal to the terminal (S840). The terminal has a second configuration information which is cell specific PRACH configuration information previously received from the transmission point. In this case, when the transmission point wants the terminal to indicate random access with the reception point (S850), the terminal transmits a PDCCH indication indicating the random access procedure to the terminal as a second signal (S860). The PDCCH indication indicates a random access procedure and includes a preamble index and a PRACH mask index, wherein the preamble index and the PRACH mask index are interpreted as the first configuration information. On the other hand, when the UE points to the random access procedure with the transmission point, the UE transmits the MAC layer signaling including the preamble index and the PRACH mask index as the second signal (S870). The preamble index and the PRACH mask index included in the MAC layer signaling are interpreted as the second configuration information.

9 is a diagram illustrating a process of implementing random access in a transmission point according to another embodiment of the present invention. 5 includes a case-C of FIG. 5 and a case-D embodiment of FIG. 6.

The transmission point generates first configuration information necessary for the terminal to perform random access with the reception point, that is, the reception point of the terminal (S810).

If it is case-C (S920), the transmission point transmits the UE-specific PRACH reconfiguration message including the first configuration information to the terminal by including the first signal (S930). The terminal has a second configuration information which is cell specific PRACH configuration information previously received from the transmission point. In this case, when the transmission point wants the terminal to indicate random access with the reception point (S940), the information field of the PDCCH indication indicating the random access procedure is set to indicate the first configuration information and transmitted to the terminal as a second signal. (S950). In FIG. 5, an exemplary embodiment in which the specific information field of the PDCCH indication is set to '1' is included. On the other hand, when the transmission point, the terminal wants to indicate the transmission point and the random access, the information field of the PDCCH indication indicating the random access procedure is set to indicate the second configuration information and transmitted to the terminal as a second signal (S960). . In FIG. 5, an exemplary embodiment in which the specific information field of the PDCCH indication is set to '0' is included. The PDCCH indication includes a preamble index and a PRACH mask index, and the terminal may check the value of the information field and use one of the first configuration information or the second configuration information to interpret the preamble index and the PRACH mask index.

In case-D (S970), the transmission point indicates a random access procedure and transmits MAC signaling or RRC signaling including a preamble index and a PRACH mask index to the terminal as a first signal (S970). The preamble index and the PRACH mask index may be interpreted as the indicated first configuration information.

8 and 9, when the operation of the transmission point is summarized, the transmission point generates first configuration information necessary for the terminal to perform random access with the reception point of the terminal (S810 and S910), and transmits to the terminal. The first signal including the first configuration information necessary to perform the random access is transmitted (S830, S840, S930, S970). The first signal may include instruction information for instructing the terminal to perform the random access (S970), and separately, a second signal including instruction information for instructing the terminal to perform the random access is a first signal. It can be transmitted afterwards (S832, S860, S870, S950, S960).

10 is a diagram illustrating a process of implementing random access in a terminal according to an embodiment of the present invention. FIG. 3 includes a case-A of FIG. 3 and a case-B of FIG. 4. The terminal receives a first signal including first configuration information necessary to perform random access from the transmission point (S1010). In more detail, the terminal receives the first signal including the UE specific PRACH reconfiguration message including the first configuration information. In case of Case-A, the terminal measures to not remove or use the second configuration information previously received from the transmission point. In operation S1030, a PDCCH indication or a MAC layer signaling indicating a random access procedure is received from a transmission point. The terminal performs random access with the reception point by using the preamble index, the PRACH mask index, and the first configuration information included in the PDCCH indication or the MAC layer signaling (S1032).

In case-B (S1020), the terminal maintains second configuration information previously received from the transmission point, for example, cell-specific PRACH configuration information, and stores the first configuration information separately. In operation S1040, a second signal including indication information indicating a random access procedure is received from the transmission point. Herein, it is checked whether the indication information is included in the PDCCH indication (S1050), and in the case of the PDCCH indication, random access is performed with the reception point using the preamble index, the PRACH mask index, and the first configuration information included in the PDCCH indication ( S1060). On the other hand, when the indication information is included in the MAC layer signaling, random access is performed with the transmission point using the preamble index, the PRACH mask index, and the second configuration information included in the MAC layer signaling (S1070).

11 is a diagram illustrating a process of implementing random access in a terminal according to an embodiment of the present invention. 5 includes a case-C of FIG. 5 and a case-D embodiment of FIG. 6.

In case of case-C, the terminal performs the processes of S1120 to S1160. The terminal receives a first signal including first configuration information necessary to perform random access from the transmission point (S1120). In more detail, the terminal receives the first signal including the UE specific PRACH reconfiguration message including the first configuration information. The terminal maintains second configuration information previously received from the transmission point, for example, cell specific PRACH configuration information, and separately stores the first configuration information. In operation S1130, a second signal including indication information indicating a random access procedure is received from the transmission point. Herein, it is checked what value the information field of the PDCCH indication including the indication information is. That is, as shown in FIG. 5, it is determined whether the value of the information field indicates '1' to indicate first setting information (S1140). If the value of the information field indicates the first configuration information, random access is performed with the reception point by using the preamble index, the PRACH mask index, and the first configuration information included in the PDCCH indication (S1150). On the other hand, when the value of the information field indicates the second configuration information, random access is performed with the transmission point using the preamble index, the PRACH mask index, and the second configuration information included in the PDCCH indication (S1160).

In case D, the UE indicates a random access procedure and receives the MAC signaling or RRC (Radio Resource Control) signaling including the first configuration information, the preamble index, and the PRACH mask index as the first signal (S1170). . The terminal performs random access with the reception point by using the first configuration information included in the signaling, the preamble index, and the PRACH mask index.

10 and 11, when the operation of the terminal is summarized, the terminal receives first signals including first configuration information necessary for performing random access from the transmission point (S1010, S1120, and S1170). The first signal may include instruction information for instructing the terminal to perform the random access (S1170), and separately, the instruction information for instructing the terminal to perform the random access after receiving the first signal is included. The second signal may be received (S1030, S1040, S1030). The terminal performs random access with the reception point using the indication information and the first configuration information (S1032, S1060, S1150, S1180), or performs random access with the transmission point using second configuration information. (S1070, S1160).

The present invention relates to a random access procedure for uplink TA coordination of any connected UE, in particular, when the eNB / RU / RRH configured as TP and the eNB / RU / RRH configured as RP are different from each other by PDCCH indication. The present invention relates to PRACH configuration information that is a basis for interpretation of allocated preamble index and PRACH MASK index information. In particular, by defining a UE-specific PRACH reconfiguration message or by defining a MAC CE or RRC-based random access procedure, randomization due to cell-specific PRACH configuration mismatch established in TP and RP It provides a solution to the problem of ambiguity in access procedures.

12 is a diagram illustrating a configuration of a transmission point for implementing random access for uplink synchronization adjustment according to an embodiment of the present invention. 12 is a diagram illustrating a configuration of a transmission point for implementing random access for uplink synchronization adjustment according to an embodiment of the present invention.

Referring to FIG. 12, a transmission point 1200 according to another embodiment includes a control unit 1210, a transmitter 1220, and a receiver 1230. The operation of the transmission point 1200 is as described with reference to FIGS. 3 to 9. The transmission point 1200 of FIG. 12 is not only a transmission function, but includes all of the base station, eNB, RU, RRH, etc., which perform the functions of the macro node or the macro cell described above.

The control unit 1210 controls the operation of the overall transmission point according to the CoMP operation and uplink / downlink transmission required to carry out the present invention described above.

The transmitter 1220 and the receiver 1230 are used to transmit and receive signals, messages, and data necessary for carrying out the present invention. Looking in more detail as follows.

The receiver 1230 receives a signal from a terminal, and the controller 1210 generates first configuration information necessary for the terminal to perform random access with the reception point of the terminal. The transmitter 1220 transmits a first signal including first configuration information necessary for performing random access to the terminal. In addition, the indication information for instructing the terminal to perform the random access is included in the first signal or the second signal transmitted after the first signal.

In more detail, as shown in the embodiment of FIG. 3, the controller 1210 controls the transmitter to transmit a PDCCH indication or MAC layer signaling indicating a random access procedure to the UE in a second signal. In this case, the indication information may include a preamble index and a PRACH mask index included in the PDCCH indication or the MAC layer signaling.

In addition, as shown in the embodiments of FIGS. 4 and 5, when the terminal stores second configuration information different from the first configuration information, the controller 1210 includes a second signal including a preamble index and a PRACH mask index. Control the transmitter to transmit to the terminal. In this case, the preamble index and the PRACH mask index are interpreted using either the first configuration information or the second configuration information indicated in the second signal. For example, in FIG. 4, the first configuration information is indicated when the second signal includes the PDCCH indication, and the second configuration information is indicated when the MAC layer signaling is included. In the case of FIG. 5, the second signal includes the PDCCH indication. If the information field is 0, the second configuration information is indicated, and if the first signal is 1, the first configuration information is indicated. When the first configuration information is indicated, the terminal performs random access with the reception point. When the second configuration information is indicated, the terminal performs random access with the transmission point.

In addition, as shown in the embodiment of FIG. 6, the controller 1210 indicates a random access procedure and includes the MAC signaling or the RRC signaling including the preamble index and the PRACH mask index in the first signal so that the transmitter 1220 transmits the first signal. To control. The preamble index and the PRACH mask index are interpreted as the indicated first configuration information.

13 is a diagram illustrating a configuration of a terminal implementing random access for uplink synchronization adjustment according to an embodiment of the present invention. The terminal 1300 includes a controller 1310, a transmitter 1320, and a receiver 1330. The operation of the terminal 1300 is as described with reference to FIGS. 3 to 7 and 10 and 11.

Referring to FIG. 13, a terminal 1300 according to another embodiment, for example, a user terminal includes a receiver 1310, a controller 1320, and a transmitter 1330.

The receiver 1110 receives downlink control information, data, and a message from a base station through a corresponding channel.

In addition, the control unit 1120 controls the operation of the base station according to the CoMP operation and uplink / downlink transmission required to perform the present invention described above.

The transmission unit 1130 transmits downlink control information, data, and a message to the base station through the corresponding channel. Looking in more detail as follows.

The receiver 1330 receives a first signal including first configuration information necessary to perform random access from a transmission point, and the transmitter 1320 transmits a signal to the reception point. The controller 1310 controls the receiver 1310 and the transmitter 1330 to perform random access with the reception point using the first setting information. In this case, the controller 1310 uses the instruction information included in the first signal or the instruction information included in the second signal received from the transmission point after receiving the first signal and the first setting information. The transmitter 1330 is controlled to perform random access with a reception point.

In more detail, as shown in the embodiment of FIG. 3, when the receiver 1310 receives a PDCCH indication or MAC layer signaling indicating a random access procedure from the transmission point as the second signal, the controller 1310 receives the PDCCH. The transmitter 1330 is controlled to perform random access with the reception point by using the indication or the preamble index and the PRACH mask index included in the MAC layer signaling and the first configuration information.

4 and 5, the terminal stores second configuration information different from the first configuration information. When the receiving unit 1310 receives a second signal including a preamble index and a PRACH mask index from the transmission point, the control unit 1310 may select any one of the first setting information or the second setting information indicated by the second signal. The transmitter 1330 is controlled to perform random access with the reception point using one and the preamble index and the PRACH mask index. In this case, the preamble index and the PRACH mask index are interpreted using either the first configuration information or the second configuration information indicated in the second signal. For example, in FIG. 4, the first configuration information is indicated when the second signal includes the PDCCH indication, and the second configuration information is indicated when the MAC layer signaling is included. In the case of FIG. 5, the second signal includes the PDCCH indication. If the information field is 0, the second configuration information is indicated, and if the first signal is 1, the first configuration information is indicated. When the first configuration information is indicated, the terminal performs random access with the reception point. When the second configuration information is indicated, the terminal performs random access with the transmission point. In addition, as shown in the embodiment of FIG. 6, when the receiver 1310 indicates a random access procedure and receives MAC signaling or RRC signaling including first configuration information, a preamble index, and a PRACH mask index as the first signal, the controller 1310 controls the transmitter 1330 to perform random access with the reception point using the preamble index and the PRACH mask index included in the PDCCH indication or the MAC layer signaling and the first configuration information.

When implementing the embodiments of the anti-invention described so far, since the transmission point provides the terminal with information necessary for the random access process between the reception point and the terminal, the random access procedure is performed based on the configuration information suitable for the reception point and the terminal. can do.

The foregoing description is merely illustrative of the technical idea of the present invention and various changes and modifications may be made by those skilled in the art without departing from the essential characteristics of the present invention. Therefore, the embodiments disclosed in the present invention are intended to illustrate rather than limit the scope of the present invention, and the scope of the technical idea of the present invention is not limited by these embodiments. The scope of protection of the present invention should be construed according to the following claims, and all technical ideas falling within the scope of the same shall be construed as falling within the scope of the present invention.

Claims

A method for a transmission point to implement random access for uplink synchronization adjustment,
Generating, by the terminal, first configuration information necessary for performing random access with the reception point of the terminal; And
Transmitting a first signal including first configuration information necessary for performing random access to the terminal;
The indication information for instructing the terminal to perform the random access is included in the first signal or a second signal transmitted after the first signal.

The method of claim 1,
After the transmitting, transmitting a PDCCH indication (Physical Downlink Control CHannel order) or a MAC layer signaling (Media Access Control layer signaling) indicating a random access procedure to the UE as a second signal,
Wherein the indication information is a preamble index and a physical random access channel mask index included in the PDCCH indication or the MAC layer signaling.

The method of claim 1,
The terminal stores second configuration information different from the first configuration information.
Instructing the UE to transmit a random access procedure and transmitting a PDCCH indication including a preamble index and a PRACH mask index as a second signal after the transmitting;
Wherein the preamble index and the PRACH mask index are interpreted as the first configuration information.

The method of claim 3, wherein
Instructing the UE to transmit a random access procedure after the transmitting, and transmitting a MAC layer signaling including a preamble index and a PRACH mask index as a second signal;
And the preamble index and the PRACH mask index are interpreted as the second configuration information.

The method of claim 1,
The terminal stores second configuration information different from the first configuration information.
Instructing the UE to transmit a random access procedure and transmitting a PDCCH indication including a preamble index and a PRACH mask index as a second signal after the transmitting;
The value of the information field included in the PDCCH indication indicates the first configuration information or the second configuration information, and the preamble index and the PRACH mask index may be any one of the indicated first configuration information or the second configuration information. Interpreted.

The method of claim 1,
The transmitting step
Transmitting a MAC signaling or RRC (Radio Resource Control) signaling including a preamble index and a PRACH mask index as a first signal indicating a random access procedure,
The preamble index and the PRACH mask index are interpreted as the indicated first configuration information.

In the method for the terminal to implement random access for uplink synchronization adjustment,
Receiving a first signal including first configuration information required to perform random access from a transmission point; And
Performing random access with a reception point by using the indication information included in the first signal or the indication information included in the second signal received from the transmission point and the first setting information after receiving the first signal. How to include.

The method of claim 7, wherein
The step of performing
Receiving a PDCCH indication (Physical Downlink Control CHannel order) or MAC layer signaling (Media Access Control layer signaling) indicating the random access procedure from the transmission point as the second signal; And
And performing random access with the reception point using a preamble index, a physical random access channel (PRACH) mask index, and the first configuration information included in the PDCCH indication or the MAC layer signaling.

The method of claim 7, wherein
Maintaining the previously stored second setting information after the receiving step and storing the first setting information;
The step of performing
Receiving, as the second signal, a PDCCH indication indicating a random access procedure from the transmission point; And
Performing random access with the reception point by using a preamble index and a PRACH mask index included in the PDCCH indication and the first configuration information.

The method of claim 9,
The step of performing
Receiving, as the second signal, MAC layer signaling indicating a random access procedure from the transmission point; And
And performing random access with the transmission point using the preamble index and the PRACH mask index included in the MAC layer signaling and the second configuration information.

The method of claim 7, wherein
Maintaining the previously stored second setting information after the receiving step and storing the first setting information;
The step of performing
Receiving a PDCCH indication indicating a random access procedure from the transmission point;
The reception point is selected by using the first configuration information or the second configuration information according to a value of the information field included in the PDCCH indication, and using the preamble index and PRACH mask index and the selected configuration information included in the PDCCH indication. Or performing random access with the transmission point.

The method of claim 7, wherein
The receiving step
Receiving, as the first signal, MAC signaling or RRC (Radio Resource Control) signaling indicating a random access procedure and including first configuration information, a preamble index, and a PRACH mask index;
And performing random access with the reception point by using the first configuration information included in the signaling, the preamble index, and the PRACH mask index.

A transmission point for implementing random access for uplink synchronization adjustment,
Receiving unit for receiving a signal from the terminal;
A controller configured to generate first configuration information necessary for the terminal to perform random access with the reception point of the terminal;
A transmitter which transmits a first signal including first configuration information necessary for performing random access to the terminal;
And the indication information for instructing the terminal to perform the random access is included in the first signal or a second signal transmitted after the first signal.

The method of claim 13,
The controller controls the transmitter to transmit by including a PDCCH indication (Physical Downlink Control CHannel order) or a MAC layer signaling (Media Access Control layer signaling) indicating a random access procedure to the terminal in a second signal,
The indication information is a transmission point, characterized in that the preamble index and the Physical Random Access CHannel (PRACH) mask index included in the PDCCH indication or the MAC layer signaling.

The method of claim 13,
The terminal stores second configuration information different from the first configuration information.
The controller controls the transmitter to transmit the second signal including the preamble index and the PRACH mask index to the terminal.
Wherein the preamble index and the PRACH mask index are interpreted using either the first configuration information or the second configuration information indicated in the second signal.

The method of claim 13,
The control unit indicates a random access procedure and controls the transmitter to transmit by including MAC signaling or Radio Resource Control (RRC) signaling including a preamble index and a PRACH mask index in a first signal.
The preamble index and the PRACH mask index are interpreted as the indicated first configuration information.

A terminal implementing random access for uplink synchronization coordination,
A receiving unit which receives a first signal including first setting information necessary to perform random access from a transmission point;
A transmitter for transmitting a signal to a reception point; And
A control unit which controls the receiving unit and the transmitting unit to perform random access with a receiving point by using the first setting information,
The control unit randomly accesses the reception point using the indication information included in the first signal or the first setting information and the indication information included in the second signal received from the transmission point after receiving the first signal. The terminal characterized in that for controlling the transmitter to perform.

The method of claim 17,
When the receiver receives a PDCCH indication (Physical Downlink Control CHannel order) or a MAC layer signaling (Media Access Control layer signaling) indicating the random access procedure from the transmission point,
The controller controls the transmitter to perform random access with the reception point by using a preamble index, a physical random access channel (PRACH) mask index included in the PDCCH indication or the MAC layer signaling, and the first configuration information. .

The method of claim 17,
The control unit maintains previously stored second setting information and stores the first setting information.
When the receiving unit receives a second signal from the transmission point, the second signal including a preamble index and a PRACH mask index,
And the control unit controls the transmitter to perform random access with the reception point using any one of the first configuration information or the second configuration information indicated by the second signal, and the preamble index and the PRACH mask index.

The method of claim 17,
When the receiver indicates a random access procedure and receives MAC signaling or Radio Resource Control (RRC) signaling including first configuration information, a preamble index, and a PRACH mask index as the first signal,
The controller controls the transmitter to perform random access with the reception point by using the first configuration information included in the signaling, the preamble index, and the PRACH mask index.