KR20150044366A - Methods for Controlling the Transmission Power of a Random Access Preamble, and Apparatuses Thereof - Google Patents

Methods for Controlling the Transmission Power of a Random Access Preamble, and Apparatuses Thereof Download PDF

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Publication number
KR20150044366A
KR20150044366A KR20140068628A KR20140068628A KR20150044366A KR 20150044366 A KR20150044366 A KR 20150044366A KR 20140068628 A KR20140068628 A KR 20140068628A KR 20140068628 A KR20140068628 A KR 20140068628A KR 20150044366 A KR20150044366 A KR 20150044366A
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South Korea
Prior art keywords
prach
preamble
transmission power
power
transmission
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KR20140068628A
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Korean (ko)
Inventor
박규진
최우진
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주식회사 케이티
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Priority to CN201480056219.1A priority Critical patent/CN105637969B/en
Priority to PCT/KR2014/009472 priority patent/WO2015056924A1/en
Priority to US15/029,265 priority patent/US9596660B2/en
Publication of KR20150044366A publication Critical patent/KR20150044366A/en

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    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
    • H04L5/00—Arrangements affording multiple use of the transmission path
    • H04L5/003—Arrangements for allocating sub-channels of the transmission path
    • H04L5/0048—Allocation of pilot signals, i.e. of signals known to the receiver
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04W—WIRELESS COMMUNICATION NETWORKS
    • H04W52/00—Power management, e.g. TPC [Transmission Power Control], power saving or power classes
    • H04W52/04—TPC
    • H04W52/18—TPC being performed according to specific parameters
    • H04W52/20—TPC being performed according to specific parameters using error rate
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04W—WIRELESS COMMUNICATION NETWORKS
    • H04W74/00—Wireless channel access
    • H04W74/08—Non-scheduled access, e.g. ALOHA
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04W—WIRELESS COMMUNICATION NETWORKS
    • H04W88/00—Devices specially adapted for wireless communication networks, e.g. terminals, base stations or access point devices
    • H04W88/02—Terminal devices
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04W—WIRELESS COMMUNICATION NETWORKS
    • H04W88/00—Devices specially adapted for wireless communication networks, e.g. terminals, base stations or access point devices
    • H04W88/08—Access point devices

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  • Engineering & Computer Science (AREA)
  • Signal Processing (AREA)
  • Computer Networks & Wireless Communication (AREA)
  • Mobile Radio Communication Systems (AREA)

Abstract

The present invention relates to methods for controlling transmission power of a random access preamble and apparatuses thereof, when terminals which are located in coverage more improved than that of normal terminals repeatedly transmit random access preamble. With the present invention, a terminal can, when repeatedly transmitting PRACH through multiple uplink subframes, decide the number of repeated transmissions of a PRACH; decide the transmission power of the PRACH based on the number of repeated transmissions of the PRACH; and transmit the PRACH with the decided transmission power.

Description

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a random access preamble transmission power control method,

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a method and apparatus for controlling a random access preamble transmission power in a wireless communication system, and more particularly, To a method and apparatus for controlling transmission power of an access preamble.

Machine type communication (hereinafter referred to as "MTC" communication) is a type of data communication in which one or more objects represent machine to machine communication that does not necessarily require human interaction . MTC communication that does not require human interaction refers to all communication methods in which communication is performed without human intervention in the communication process.

The MTC terminal can be installed in a place where the radio wave environment is worse than that of a general terminal. It may be necessary to repeatedly transmit control information and / or data of each physical channel transmitted only in one subframe in a plurality of subframes in order for the MTC terminal to operate in a place where the radio wave environment is worse than that of a general terminal.

On the other hand, since the general terminal does not repeatedly transmit the random access preamble in a plurality of subframes, the transmission power of the random access preamble can be determined without considering that the random access preamble is repeatedly transmitted.

It is an object of the present invention to provide a method of controlling the transmission power of a random access preamble when the MTC terminal repeatedly transmits a random access preamble in a plurality of subframes to overcome the above-described problem.

One embodiment of the present invention is a method for a UE to transmit a random access preamble through a Physical Random Access Channel (PRACH), wherein the PRACH is repeated through a plurality of uplink subframes Determining a number of times the PRACH is repeatedly transmitted and determining a transmission power of the PRACH based on the number of times the PRACH is repeatedly transmitted; And repeatedly transmitting the PRACH with the determined transmit power of the PRACH.

According to another embodiment of the present invention, there is provided a method of transmitting configuration information on a transmission power of a Physical Random Access Channel (PRACH) to a mobile station, the method comprising the steps of: Determining setting information for the transmission power of the PRACH; And transmitting configuration information on the transmission power of the PRACH to the terminal through higher layer signaling.

Another embodiment of the present invention is a UE for transmitting a random access preamble through a Physical Random Access Channel (PRACH). When a UE repeatedly transmits the PRACH through a plurality of uplink subframes A controller for determining the number of times the PRACH is repeatedly transmitted and for determining a transmission power of the PRACH based on the number of times the PRACH is repeatedly transmitted; And a transmitter for repeatedly transmitting the PRACH based on the determined transmission power of the PRACH.

According to another aspect of the present invention, there is provided a base station for transmitting configuration information on a transmission power of a physical random access channel (PRACH) to a terminal, the base station comprising: The transmission power of the mobile station is determined based on the setting information. And a transmitter for transmitting setting information on the transmission power of the PRACH to the terminal through higher layer signaling.

According to the present invention, it is possible to provide a method of controlling the transmission power of the random access preamble when the MTC terminal repeatedly transmits a random access preamble in a plurality of subframes.

1 is a diagram illustrating an initial cell access procedure of a UE.
FIG. 2 is a diagram illustrating a random access procedure in FIG. 1. FIG.
3 is a diagram illustrating a process of transmitting a random access preamble and a random access response in the case of a general terminal.
4 is a table showing a value of a parameter DELTA_PREAMBLE used in determining the transmission power of a random access preamble in a case of a general terminal.
5 is a diagram illustrating a process in which a random access preamble and a random access response are repeatedly transmitted in the case of the MTC terminal.
6 is a table showing an example of the relationship between the random access preamble repetition level and the number of repetitions of the random access preamble.
7 is a table showing an example of the table of Fig.
8 is a flowchart illustrating a random access preamble transmission power control method according to an embodiment of the present invention.
9 is a flowchart illustrating a random access preamble transmission power control method according to another embodiment of the present invention.
FIG. 10 is a table showing an example of parameters transmitted through upper layer signaling in FIG.
FIG. 11 is a table showing another example of parameters transmitted through upper layer signaling in FIG.
FIG. 12 is a table showing another example of parameters transmitted through upper layer signaling in FIG.
13 is a flowchart showing an example of a random access preamble transmission power control method for a case where random access preamble transmission fails.
14 is a diagram showing an example of a change in the transmission power and the number of times of transmission of the random access preamble transmission over time in the example of FIG.
15 is a flowchart showing another example of a random access preamble transmission power control method for a case where random access preamble transmission fails.
16 is a diagram showing an example of a change in the transmission power and the number of times of transmission of the random access preamble transmission over time in the example of FIG.
17 is a block diagram showing a configuration of a terminal according to an embodiment of the present invention.
18 is a block diagram showing the configuration of a base station 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 numerals even though they are shown in different drawings. In the following description of the present invention, a detailed description of known functions and configurations incorporated herein will be omitted when it may make the subject matter of the present invention rather unclear.

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). The user terminal in this specification is a comprehensive concept of a terminal in wireless communication. It is a comprehensive concept which means a mobile station (MS), a user terminal (UT), an SS (User Equipment) (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 (eNB), a sector, a Site, a BTS A base transceiver system, an access point, a relay node, a remote radio head (RRH), a radio unit (RU), and a small cell.

That is, the base station or the cell in this specification is interpreted as a comprehensive meaning indicating a partial region or function covered by BSC (Base Station Controller) in CDMA, NodeB in WCDMA, eNB in LTE or sector (site) And covers various coverage areas such as megacell, macrocell, microcell, picocell, femtocell and relay node, RRH, RU, and small cell communication range.

Since the various cells listed above exist in the base station controlling each cell, the base station can be interpreted into two meanings. i) a device itself providing a megacell, a macrocell, a microcell, a picocell, a femtocell, or a small cell in relation to a wireless region, or ii) the wireless region itself. i indicate to the base station all devices that are controlled by the same entity or that interact to configure the wireless region as a collaboration. An eNB, an RRH, an antenna, an RU, an LPN, a point, a transmission / reception point, a transmission point, a reception point, and the like are exemplary embodiments of a base station according to a configuration method of a radio area. ii) may indicate to the base station the wireless region itself that is to receive or transmit signals from the perspective of the user terminal or from a neighboring base station.

Therefore, a base station is collectively referred to as a megacell, a macrocell, a microcell, a picocell, a femtocell, a small cell, an RRH, an antenna, an RU, a low power node (LPN), a point, an eNB, Quot;

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, an uplink (UL, or uplink) means a method of transmitting / receiving data to / from a base station by a user terminal, and a downlink (DL or downlink) .

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 systems such as LTE and LTE-Advanced, the uplink and downlink are configured on the basis of one carrier or carrier pair to form a standard. The uplink and the downlink are divided into a Physical Downlink Control Channel (PDCCH), a Physical Control Format Indicator CHannel (PCFICH), a Physical Hybrid ARQ Indicator CHannel, a Physical Uplink Control CHannel (PUCCH), an Enhanced Physical Downlink Control Channel (EPDCCH) Transmits control information through the same control channel, and is configured with data channels such as PDSCH (Physical Downlink Shared CHannel) and PUSCH (Physical Uplink Shared CHannel), and transmits data.

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

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 multiplex transmission / reception point to a terminal, and an uplink refers to a communication or communication path from a terminal to a multiplex transmission / reception point. In the downlink, a transmitter may be a part of a multipoint transmission / reception point, and a receiver may be a 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, EPDCCH, and PDSCH is expressed as a form of transmitting / receiving PUCCH, PUSCH, PDCCH, EPDCCH and PDSCH.

In the following description, an indication that a PDCCH is transmitted or received or a signal is transmitted or received via a PDCCH may be used to mean transmitting or receiving an EPDCCH or transmitting or receiving a signal through an EPDCCH.

That is, the physical downlink control channel described below may mean a PDCCH, an EPDCCH, or a PDCCH and an EPDCCH.

Also, for convenience of description, EPDCCH, which is an embodiment of the present invention, may be applied to the portion described with PDCCH, and EPDCCH may be applied to the portion described with EPDCCH according to an embodiment of the present invention.

Meanwhile, the High Layer Signaling described below includes RRC signaling for transmitting RRC information including RRC parameters.

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 / reception of a signal through each channel will be described in a form in which the corresponding channel is transmitted / received.

1 is a diagram illustrating an initial cell access procedure of a UE.

Referring to FIG. 1, in the initial cell access procedure of the UE, the UE 10 receives a Primary Synchronization Signal (PSS) and a Secondary Synchronization Signal (SSS), which are synchronization signals transmitted from the Node B 20 (S 102). In the LTE FDD (Frequency Division Duplex), the PSS can be transmitted in the last symbol (#n) of the first slot of the subframe # 0 and the subframe # 5 in one radio frame (10 ms) May be transmitted in the previous symbol (# n-1) of the last symbol (#n) of the first slot of frame # 5. In LTE TDD, the PSS / SSS can be transmitted at a different location than the FDD. When the terminal 10 detects the PSS and the SSS, it can acquire the cell ID and the downlink synchronization information, and can obtain a cell-specific reference signal (CRS) based on the information obtained based on the PSS / ) To perform additional synchronization and conventional control channel decoding.

The terminal 10 receives a signal from the base station 20 via the PBCH based on the PSS / SSS (S104), and extracts a MIB (master information block) transmitted through the PBCH (S106). The MIB may include information indicating the bandwidth of the cell, information indicating the PHICH configuration, and information indicating the system frame number. The terminal 10 can know the resource to which the PDCCH is allocated based on the information included in the MIB.

The terminal 10 receives a signal from the base station 20 via the PDCCH based on the CRS (S108), and extracts downlink control information (DCI) transmitted through the PDCCH (S110). The DCI may be control information for a PDSCH to which a system information block (SIB) is transmitted, and may be transmitted through a common search space.

The UE 10 acquires PDSCH resource allocation information through which the SIB is transmitted through the DCI (S112), and extracts the SIB transmitted on the PDSCH based on the PDSCH resource allocation information (S114).

Thereafter, the terminal 10 and the base station 20 perform a random access procedure (S116), and the terminal 10 can enter the RRC connected state from the RRC idle state.

2 is a diagram illustrating in more detail step S116 of performing the random access procedure of FIG.

Referring to FIG. 2, the BS 20 transmits PRACH configuration information to the UE 10 (S202). PRACH setting information may be included in SIB2. The PRACH setting information includes a parameter " preambleInitialReceivedTargetPower " powerRampingStep . Parameters preambleInitialReceivedTargetPower And A detailed description of the powerRampingStep will be given later.

The terminal 10 determines the transmission power of the PRACH and transmits a random access preamble to the base station 20 through the PRACH (S204).

The base station 20 receiving the random access preamble transmits scheduling information on a random access response (RAR) to the UE 10 through the PDCCH or EPDCCH (S206). The downlink control information (DCI) including the scheduling information for the RAR may be scrambled with the RA-RNTI and transmitted through the PDCCH or the EPDCCH common search space (CSS).

The base station 20 transmits the RAR through the PDSCH to the UE 10, and the UE 10 receiving the scheduling information for the RAR receives the RAR using the RAR (S208).

3 is a diagram illustrating a process of transmitting a random access preamble and a random access response in the case of a general terminal.

Referring to FIG. 3, the UE 10 transmits a random access preamble through the PRACH in the uplink subframe #n. The base station 20 receiving the random access preamble transmits the RAR through the PDSCH in the downlink subframe # (n + k). At this time, the UE 10 transmits a random access preamble in one uplink subframe (subframe #n), and the base station 20 transmits a random access preamble in one downlink subframe (subframe # (n + k) Lt; / RTI > When the terminal 10 fails to transmit the random access preamble (or when the terminal 10 fails to receive the RAR), the terminal 10 transmits a random access preamble through the PRACH to the next PRACH transmission subframe.

In step S204 of FIG. 2, the random access preamble transmission power (P PRACH ) of the UE 10 can be determined by the following equation (1).

(1) P PRACH = min {

Figure pat00001
, PREAMBLE_RECEIVED_TARGET_POWER +
Figure pat00002
} _ [dBm]

In Equation (1)

Figure pat00003
PREAMBLE_RECEIVED_TARGET_POWER is the target preamble reception power generated in the MAC layer, and PREAMBLE_RECEIVED_TARGET_POWER is the maximum transmission power in the subframe i of the serving cell c in which the UE transmits the random access preamble,
Figure pat00004
Is a value of the downlink path loss measured at the terminal 10. PREAMBLE_RECEIVED_TARGET_POWER can be determined by the following equation (2).

(2) PREAMBLE_RECEIVED_TARGET_POWER = preambleInitialReceivedTargetPower + DELTA_PREAMBLE + (PREAMBLE_TRANSMISSION_COUNTER - 1) * powerRampingStep

In Equation (2), preambleInitialReceivedTargetPower And The powerRampingStep is a value received as an RRC parameter through the upper layer signaling in step S202 of FIG. 2. DELTA_PREAMBLE is a value determined according to the preamble format as shown in the table of FIG. 4. PREAMBLE_TRANSMISSION_COUNTER is a number of times the UE attempts transmission of the random access preamble to be.

Referring to Equations (1) and (2), when the UE 10 first transmits a random access preamble and the preamble format is 0 or 1, the random access preamble transmission power (P PRACH )

Figure pat00005
, preambleInitialReceivedTargetPower +
Figure pat00006
}. When the transmission of the random access preamble is failed and the random access preamble is retransmitted, the random access preamble transmission power ( PRACH ) increases by powerRampingStep .

[Low-cost MTC based on LTE]

As the LTE network spreads, mobile operators want to minimize the number of Radio Access Terminals (RATs) to reduce network maintenance costs. However, conventional MTC products based on a GSM / GPRS network are increasing, and MTC using a low data rate can be provided at low cost. Therefore, there is a problem in that two RATs must be operated respectively, since LTE network is used for general data transmission and GSM / GPRS network is used for MTC. Therefore, Of the total revenue.

In order to solve this problem, it is necessary to replace a cheap MTC terminal using a GSM / EGPRS network with an MTC terminal using an LTE network, and various requirements for lowering the price of the LTE MTC terminal are required for the 3GPP RAN WG1 standard conference . In addition, in the standard meeting, a document describing various functions that can be provided to satisfy the requirements is being created.

The main items related to the physical layer specification change, which are currently being discussed in the 3GPP, include technologies such as narrow band support, single RF chain, Half duplex FDD and long DRX (Discontinued Reception) to support the low-cost LTE MTC terminal. However, the above methods, which are considered for lowering the price, can reduce the performance of the MTC terminal as compared with the conventional LTE terminal.

In addition, about 20% of MTC terminals supporting MTC services such as smart metering are installed in a 'Deep indoor' environment such as a basement, so that for successful MTC data transmission, Compared with the coverage of the first embodiment. In addition, considering the performance reduction due to the above-mentioned specification change, the coverage of the LTE MTC terminal should be improved by 20 dB or more.

Various methods for robust transmission such as power spectral density (PSD) boosting or low coding rate and time domain repetition are considered for each physical channel in order to improve the coverage while lowering the price of the LTE MTC terminal have.

The requirements of low-cost MTC terminal based on LTE are as follows.

● The data transmission rate should satisfy the minimum data transmission rate provided by MTC terminal based on EGPRS (enhanced GPRS), that is, downlink 118.4kbps and uplink 59.2kbps.

● Frequency efficiency should be improved dramatically compared to GSM / EGPRS MTC terminal.

● The service area provided should not be less than that provided by the GSM / EGPRS MTC terminal.

● Power consumption should not be larger than GSM / EGPRS MTC terminal.

● General LTE terminal and LTE MTC terminal should be able to use at the same frequency.

Reuse existing LTE / SAE networks.

● Perform optimization not only in FDD mode but also in TDD mode.

Low-cost LTE MTC terminals should support limited mobility and low power consumption modules.

In the present invention, a low-priced MTC terminal that requires less coverage and improvement in radio channel transmission / reception performance than a general LTE / LTE-Advanced terminal will be referred to as a coverage limited MTC terminal.

[Random access preamble repetition for coverage limitation MTC terminal]

In order to improve the performance of receiving a random access preamble of an MTC mobile station in a certain LTE / LTE-Advanced base station, a random access preamble format for the MTC terminal may be newly defined or an existing random access preamble format may be repetitively transmitted Can be considered.

For example, in the case of the coverage limited MTC terminal, the preamble generated based on the random access preamble format for the existing general LTE / LTE-A terminal is repeated M times and transmitted in M uplink subframes as shown in FIG. Can be considered. At this time, the base station can transmit R LAR times in L downlink subframes by repeating RAR to the coverage limited MTC terminal.

For another example, in the case of a coverage limited MTC terminal, the length of the preamble format defined in M uplink subframes, i.e., the sum of the CP length and the sequence length of the preamble format

Figure pat00007
+
Figure pat00008
, Or the sequence length,
Figure pat00009
May be considered as a method of transmitting a preamble generated based on a new random access preamble format having an increased length of the random access preamble format.

According to the UE's random access preamble transmission method in the existing LTE / LTE-A system, a UE that wishes to transmit a random access preamble can use Equation (1) and Equation (2) The preamble transmission power is set and transmitted. However, when the PRACH repeat transmission scheme is applied as a method for enhancing the preamble reception performance of the MTC terminal with the limited coverage, it is necessary to newly define a scheme for setting the random access preamble transmission power.

In the present invention, a scheme for setting a random access preamble transmission power for the MTC terminal will be proposed. In particular, when it is defined that a random access preamble of an arbitrary MTC terminal is repeatedly transmitted, it is proposed to set each random access preamble transmission power according to the M number of repetition times.

Embodiments of the present invention propose a random access preamble transmission scheme of any coverage limited MTC terminal. In particular, when a random access preamble transmission is repeatedly transmitted through a plurality of uplink subframes as a method for enhancing transmission / reception performance of a random access preamble of a coverage limited MTC terminal, a repetition level (or a repetition frequency) We propose a method for determining the transmission power of each random access preamble.

To this end, the present invention will be described on the basis of a case where five random access preamble formats defined in the existing LTE / LTE-Advanced system are repeatedly transmitted. The number of random access preamble repetition levels supported by an arbitrary cell is shown in FIG. As shown in the table of FIG.

In FIG. 6, it is apparent that the n and M n (n = 1, 2, ..., N) values have arbitrary natural numbers, and the proposal of the present invention can be applied without limiting the concrete values thereof. As an example, referring to FIG. 7, a repetition level n and a repetition number M n The value can be defined in the form of 2 (n-1) .

As described above, when a plurality of repetition levels are defined for an arbitrary limited MTC terminal, the transmission power for each random access preamble transmission of the corresponding MTC terminal according to the value of the repetition number M n corresponding to the value of the repetition level n Settings may vary.

In the present invention, Equation (1) used to determine the random access preamble transmission power in the physical layer of the existing LTE / LTE-Advanced terminal, or Equation (2) used to determine PREAMBLE_RECEIVED_TARGET_POWER in the MAC layer, A method of controlling the random access preamble transmission power for the coverage limited MTC terminal by adding the number of repetitions and the value of M n according to the selected random access preamble repetition level for the corresponding MTC terminal as a parameter.

Embodiment 1. Random access preamble transmission power control through physical layer

In this embodiment, among the equations (1) and (2) used to set the random access preamble transmission power of the general terminal, Equation (1) is changed in consideration of the case where the random access preamble is repeatedly transmitted And equation (2) can be used without being changed.

8 is a flowchart illustrating a random access preamble transmission power control method according to an embodiment of the present invention.

Referring to FIG. 8, when the transmission of the random access preamble is repeated for M n times and transmitted through M n uplink subframes, the terminal 10 transmits the transmission power of the random access preamble to the number of random access preamble repetitions M n (S802). For example, the transmission power of the random access preamble can be determined by the following equation (3).

(3) P PRACH = min {

Figure pat00010
, PREAMBLE_RECEIVED_TARGET_POWER +
Figure pat00011
- 10logM n } _ [dBm]

In the equation (3)

Figure pat00012
Is the maximum transmission power in the subframe i of the serving cell c in which the UE transmits the random access preamble,
Figure pat00013
Is the value of the downlink path loss measured at the UE 10, and M n is the number of random access preamble repeats. PREAMBLE_RECEIVED_TARGET_POWER can be determined as shown in Equation (2). When calculating the PREAMBLE_RECEIVED_TARGET_POWER using Equation (2), the parameter PREAMBLE_TRANSMISSION_COUNTER indicating the number of times the UE attempts to transmit the random access preamble repeats the random access preamble repeatedly M n times to attempt transmission .

7, M n When the value is defined as 2 (n-1) type, Equation (3) can be expressed as Equation (4).

(4) P PRACH = min {

Figure pat00014
, PREAMBLE_RECEIVED_TARGET_POWER +
Figure pat00015
- 3 * (n-1)} _ [dBm]

The terminal 10 transmits the random access preamble to the base station 20 through the PRACH using the determined transmission power of the random access preamble (S804).

The above equation (3) is presented as an example, and various expressions can be used in which the repetition level n of the random access preamble or the number N m of random access preamble repetition is included as a parameter.

Embodiment 2 Random Access Preamble Transmission Power Control through Upper Layer

In the present embodiment, Equation (1) is used unchanged among equations (1) and (2) used to set the random access preamble transmission power of a general terminal, Equation (2) May be changed and used in consideration of the case of repeated transmission.

9 is a flowchart illustrating a random access preamble transmission power control method according to another embodiment of the present invention.

Referring to FIG. 9, the UE 10 receives PRACH configuration information from the Node B 20 through upper layer signaling (S902). The PRACH setting information includes the parameter preambleInitialReceivedTargetPower And powerRampingStep . Alternatively, the PRACH setting information may further include a new parameter.

The terminal 10 determines the random access preamble transmission power based on the number of times of random access preamble repetition (S904). At this time, the terminal 10 calculates the random access preamble transmission power using Equation (1), and PREAMBLE_RECEIVED_TARGET_POWER can be calculated using an equation different from Equation (2).

For example, PREAMBLE_RECEIVED_TARGET_POWER can be determined as shown in Equation (5) below.

(5) PREAMBLE_RECEIVED_TARGET_POWER = preambleInitialReceivedTargetPower + DELTA_PREAMBLE + DELTA_PREAMBLE_REPETITION + (PREAMBLE_TRANSMISSION_COUNTER - 1) * powerRampingStep

In Equation (5), preambleInitialReceivedTargetPower And powerRampingStep is a value received as an RRC parameter in step S902 through upper layer signaling, DELTA_PREAMBLE is a value determined according to the preamble format as shown in the table of FIG. 4, and PREAMBLE_TRANSMISSION_COUNTER is the number of times the UE has attempted to transmit the random access preamble. The PREAMBLE_TRANSMISSION_COUNTER can repeat transmission of the random access preamble by repeating the random access preamble repetition times M n times.

On the other hand, DELTA_PREAMBLE_REPETITION can be determined by the table of FIG. Referring to FIG. 10, DELTA_PREAMBLE_REPETITION may be determined according to the random access preamble repetition level. Alternatively, it is also possible that DELTA_PREAMBLE_REPETITION is determined according to the number of random access preamble repetitions.

According to this example, the PREAMBLE_RECEIVED_TARGET_POWER can be determined based on the random access preamble repetition level or the number of random access preamble repetitions, and therefore the preamble transmission power P PRACH can also be determined based on the random access preamble repetition level or the number of random access preamble repetition.

As another example, PREAMBLE_RECEIVED_TARGET_POWER can be determined as shown in Equation (6) below.

(6) PREAMBLE_RECEIVED_TARGET_POWER = preambleInitialReceivedTargetPower + DELTA_PREAMBLE + a * M n + (PREAMBLE_TRANSMISSION_COUNTER - 1) * powerRampingStep

In Equation (5), preambleInitialReceivedTargetPower And powerRampingStep is a value received as an RRC parameter in step S902 through upper layer signaling, DELTA_PREAMBLE is a value determined according to the preamble format as shown in the table of FIG. 4, and PREAMBLE_TRANSMISSION_COUNTER is the number of times the UE has attempted to transmit the random access preamble. The PREAMBLE_TRANSMISSION_COUNTER can repeat transmission of the random access preamble by repeating the random access preamble repetition times M n times. Also, M n is the number of random access preamble repetitions, and a may be preset as a proportional constant or may be a value indicated by the base station, for example, via higher layer signaling. For example, a = -3 may be set, or another real number may be set.

It is also possible that the random access preamble repetition level n is used instead of the random access preamble transmission repetition M n in the equation (6).

As another example, the PREAMBLE_RECEIVED_TARGET_POWER may be determined according to the above-described equation (2).

At this time, the parameter used in Equation (2), preambleInitialReceivedTargetPower , may be defined as a separate value according to the random access preamble repetition level or the random access preamble repetition number. For example, the parameter preambleInitialReceivedTargetPower can be defined as shown in the table of FIG. 11, the base station 20 defines a separate value for the preambleInitialReceivedTargetPower for each random access preamble repetition level or the random access preamble repetition number, and transmits it to the UE 10 through cell-specific or UE-specific RRC signaling, Lt; / RTI > The terminal 10 receives the parameter preambleInitialReceivedTargetPower defined by the base station 20 in step S902, and calculates the PREAMBLE_RECEIVED_TARGET_POWER by using it in step S904.

Alternatively, the value of preambleInitialReceivedTargetPower according to the random access preamble repetition level or the number of random access preamble repetition times may be defined to be implicitly determined.

As another example, the PREAMBLE_RECEIVED_TARGET_POWER may be determined according to the above-described equation (2).

At this time, powerRampingStep, which is a parameter used in Equation (2), may be defined as a separate value according to the random access preamble repetition level or the number of random access preamble repetition times. For example, the parameter powerRampingStep may be defined as shown in the table of FIG. The base station 20 may define a separate value for the powerRampingStep for each random access preamble repetition level or the number of random access preamble repetitions using the table of FIG. 12 and transmit it to the terminal 10 through cell-specific or terminal-specific RRC signaling, Lt; / RTI > The terminal 10 receives the parameter powerRampingStep defined by the base station 20 in step S902, and calculates the PREAMBLE_RECEIVED_TARGET_POWER by using the parameter powerRampingStep in step S904.

Alternatively, the value of the powerRampingStep received through the upper layer signaling is a value determined without considering the random access preamble repetition level or the number of random access preamble repetition, and when the parameter powerRampingStep is applied in Equation (2), the random access preamble repetition level or A normalized value may be applied as a function of the number of random access preamble repetitions. For example, the value of powerRampingStep received via higher layer signaling may be adjusted to be inversely proportional to the random access preamble repetition level or the number of random access preamble repetitions.

As described above, in step S904, the PREAMBLE_RECEIVED_TARGET_POWER may be determined based on the random access preamble repetition level or the number of random access preamble repetitions, so that the preamble transmission power P PRACH is also determined based on the random access preamble repetition level or the random access preamble repetition count Can be determined.

The terminal 10 transmits the random access preamble using the preamble transmission power P PRACH determined in step S904 (S906).

On the other hand, when the terminal 10 fails to transmit the random access preamble based on the preamble repetition level n, i.e., when the terminal 10 fails to receive the RAR after transmitting the random access preamble based on the preamble repetition level n, Power ramping may be attempted first, then repetition level ramping may be attempted, or power ramping may be attempted after first attempting repetition level ramping. Here, power ramping means increasing power to the next level, and repetition level ramping means increasing the repetition level from n to n + 1.

13 is a flow chart illustrating an embodiment in which power ramping is attempted first and then repetitive level ramping is attempted.

Referring to FIG. 13, the UE 10 transmits a random access preamble at a transmission power determined based on a preamble repetition level or a preamble repetition number (S1302).

The UE 10 determines whether an RAR for the transmitted random access preamble has been received (S1304).

When the RAR for the transmitted random access preamble is not received, that is, when the random access preamble transmission fails (NO in S1304), the terminal 10 sets the PREAMBLE_RECEIVED_TARGET_POWER (for example, equations (2), 5), or (6)), the value of PREAMBLE_TRANSMISSION_COUNTER is incremented by one to perform power ramping (S1306). At this time, the value of PREAMBLE_RECEIVED_TARGET_POWER is increased as to increase by the value or values of the normalized (normalized) of powerRampingStep powerRampingStep, the random access preamble transmission power (P PRACH) is a value or values of the normalized powerRampingStep of powerRampingStep.

The terminal 10 determines whether the random access preamble transmission power P PRACH determined in step S1306 is equal to or greater than the maximum transmission power

Figure pat00016
) Or less (S1308). If the determined random access preamble transmission power (P PRACH ) is less than the maximum transmission power (
Figure pat00017
) (YES in S1308), the UE 10 transmits the random access preamble again using the random access preamble transmission power (P PRACH ) determined in step S1306 (S1302).

If the determined random access preamble transmission power (P PRACH ) is less than the maximum transmission power (

Figure pat00018
(NO in S1308), the UE 10 increases the preamble repetition level to the next level to perform repetition level ramping (S1310), and transmits a random access preamble transmission based on the increased preamble repetition level or the number of preamble repetitions And determines the power (P PRACH ) (S1312). Then, the terminal 10 transmits the random access preamble again using the random access preamble transmission power (P PRACH ) determined in step S1312 (S1302).

When the terminal 10 performs repetition level ramping, the terminal 10 may reset the value of PREAMBLE_TRANSMISSION_COUNTER to an initial value of 1, and thereby determine the random access preamble transmission power. Alternatively, the terminal 10 can determine the random access preamble transmission power while maintaining the value of PREAMBLE_TRANSMISSION_COUNTER. Alternatively, the terminal 10 may set the random access preamble transmission power to the current transmission power, that is, the maximum transmission power (

Figure pat00019
) Can be maintained while only the repetition level can be increased.

14 is a diagram showing an example of a change in the transmission power and the number of times of transmission of the random access preamble transmission over time in the example of FIG.

Referring to FIG. 14, the UE 10 initially transmits a random access preamble with a preamble repetition number of 4 (1410). When the random access preamble transmission fails, the terminal 10 performs power ramping to incrementally increase the transmission power of the random access preamble (1420, 1430). If the transmission power of the random access preamble is the maximum transmission power (

Figure pat00020
The terminal 10 performs repetition level ramping to increase the number of times of preamble repetition and transmits the random access preamble in step 1440.

Although the preamble transmission power is shown to be constant when repetition level ramping is performed in FIG. 14, the present invention is not limited thereto. As another example, the terminal 10 can newly determine the transmission power of the random access preamble based on the changed number of times of preamble repetition when performing the repetition level ramping.

15 is a flowchart illustrating an embodiment of attempting power ramping after first attempting repetition level ramping.

Referring to FIG. 14, the UE 10 transmits a random access preamble at a transmission power determined based on a preamble repetition level or a preamble repetition number (S1502).

The UE 10 determines whether an RAR for the transmitted random access preamble has been received (S1504).

When the RAR for the transmitted random access preamble is not received, that is, when the random access preamble transmission fails (NO in S1504), the terminal 10 increases the preamble repetition level to the next level and performs repetition level ramping S1506).

When the terminal 10 performs repetition level ramping, the terminal 10 can maintain the random access preamble transmission power before the repetition level ramping is performed.

Alternatively, the terminal 10 may newly determine the random access preamble transmission power based on the changed preamble repetition level or the number of preamble repetition times through repetition level ramping. At this time, the UE 10 may determine the random access preamble transmission power by resetting the value of PREAMBLE_TRANSMISSION_COUNTER to an initial value of 1, or may determine the random access preamble transmission power while maintaining the value of PREAMBLE_TRANSMISSION_COUNTER.

The terminal 10 determines whether the preamble repetition level is equal to or less than the maximum repetition level N (S1508). If the preamble repetition level is equal to or less than the maximum repetition level N (YES in S1508), the terminal 10 transmits a random access preamble again (S1402).

If the preamble repetition level is larger than the maximum repetition level N (NO in S1508), the terminal 10 sets the value of the PREAMBLE_TRANSMISSION_COUNTER in the set formula of PREAMBLE_RECEIVED_TARGET_POWER (for example, Equation 2, Equation 5 or Equation 6) Is increased by one to perform power ramping (S1510). Then, the terminal 10 transmits the random access preamble again with the changed preamble transmission power (S1502).

When the terminal 10 performs power ramping, the terminal 10 can maintain the preamble repetition level at the current value, i.e., the maximum repetition level N. [ At this time, the value of PREAMBLE_RECEIVED_TARGET_POWER is increased by the value or values of the normalized powerRampingStep of powerRampingStep, the random access preamble transmission power (P PRACH) can be increased by a value or values of the normalized powerRampingStep of powerRampingStep.

Alternatively, the terminal 10 may reset the preamble repetition level to an initial value. In this case, the UE 10 can determine the preamble transmission power based on the reset preamble repetition level and the value of the increased PREAMBLE_TRANSMISSION_COUNTER.

16 is a diagram showing an example of a change in the transmission power and the number of times of transmission of the random access preamble transmission over time in the example of FIG.

In Figure 16, when the iteration level of the random access preamble, n is determined by the number of repetitions M n = 2 (n-1 ) of the random access preamble, the maximum iteration level is assumed to be four. The terminal 10 initially transmits a random access preamble with a preamble repetition level of 1 (preamble repetition number 1) (1616). When the random access preamble transmission fails, the terminal 10 performs repetition level ramping to stepwise increase the preamble repetition level (1620, 1630, 1640). When the random access preamble transmission fails even though the preamble repetition level has reached the maximum repetition level 4 (preamble repetition number 8), the terminal 10 performs power ramping to increase the transmission power of the random access preamble and transmit a random access preamble (1650).

Although the preamble transmission power is shown to be constant when repetition level ramping is performed in FIG. 16, the present invention is not limited to this. As another example, the terminal 10 can newly determine the transmission power of the random access preamble based on the changed number of times of preamble repetition when performing the repetition level ramping.

17 is a block diagram showing a configuration of a terminal according to an embodiment of the present invention.

17, the terminal 1500 includes a control unit 1710, a transmitting unit 1720, and a receiving unit 1730.

The control unit 1710 controls the overall operation of the terminal 1700. The controller 1710 may control the overall operation for performing the embodiments of the present invention.

The transmitting unit 1720 and the receiving unit 1730 can transmit and receive signals, messages, or data necessary for performing the embodiments of the present invention to / from the base station.

The receiver 1730 can receive PRACH configuration information from the base station through higher layer signaling. The PRACH setting information includes parameters preambleInitialReceivedTargetPower and powerRampingStep .

The control unit 1710 can determine the repeat transmission level or the number of times of the random access preamble. In addition, the controller 1710 can determine the transmission power of the random access preamble based on the repetition transmission level or the number of times of the determined random access preamble.

For example, the calculation formula of the transmission power of the random access preamble may include the repetition transmission level or the number of times of the random access preamble as one parameter, or a value determined based on the repetition transmission level or the number of times of the random access preamble as one parameter .

Alternatively, the PRACH setting information includes a parameter determined by the base station based on the repetition transmission level or the number of times of the random access preamble, and the control unit 1710 uses the parameter determined based on the repetition transmission level or the number of times of the random access preamble The transmission power of the random access preamble can be determined. The parameter determined by the base station based on the repeat transmission level or the number of times of the random access preamble is the parameter preambleInitialReceivedTargetPower And powerRampingStep , or it may be a new parameter (e.g., DELTA_PREAMBLE_REPETITION).

Alternatively, the parameters included in the PRACH setting information may be normalized according to the repetition transmission level or the number of times, and the controller 1510 may determine the transmission power of the random access preamble using the normalized parameters.

On the other hand, if the random access preamble transmission fails, that is, if RAR reception fails after the random access preamble transmission, the controller 1710 tries first to perform power ramping and then tries repeated level ramping, . ≪ / RTI >

If power ramping is first attempted, controller 1710 first determines the maximum transmit power (< RTI ID = 0.0 >

Figure pat00021
), The random access preamble transmission is attempted while gradually increasing the random access preamble transmission power, and when the random access preamble transmission fails even at the maximum transmission power, the random access preamble transmission is attempted while incrementing the preamble repetition level step by step .

When the repetition level ramping is attempted first, the controller 1710 first tries to transmit the random access preamble while gradually increasing the preamble repetition level until the maximum repetition level N, and when the preamble transmission fails even at the maximum repetition level, It is possible to attempt random access preamble transmission while gradually increasing the random accessor preamble transmission power.

The transmitter 1720 can transmit the random access preamble with the random access preamble transmission power determined by the controller 1710 and the receiver 1730 can receive the random access response (RAR) from the base station with respect to the random access preamble.

18 is a block diagram showing the configuration of a base station according to an embodiment of the present invention.

18, the terminal 1800 includes a control unit 1810, a transmitting unit 1820, and a receiving unit 1830.

The control unit 1810 controls the overall operation of the terminal 1600. The controller 1810 may control the overall operation for performing the embodiments of the present invention.

The transmitter 1820 and the receiver 1830 can transmit and receive signals, messages, or data necessary for performing the embodiments of the present invention to / from the base station.

The transmitter 1820 can transmit PRACH configuration information to the UE through higher layer signaling. The PRACH setting information includes parameters preambleInitialReceivedTargetPower and powerRampingStep .

In some embodiments of the present invention, the control unit 1810 may determine at least one of the parameters included in the PRACH setting information based on the repetitive transmission level or the number of times of the random access preamble at the terminal. The parameters determined by the control unit 1810 based on the repetition transmission level or the number of times of the random access preamble are the parameters preambleInitialReceivedTargetPower and powerRampingStep , or it may be a new parameter (e.g., DELTA_PREAMBLE_REPETITION). These parameters can be used when the UE determines the random access preamble transmission power.

The receiving unit 1830 can receive the random access preamble from the terminal, and the transmitting unit 1620 can transmit the random access response (RAR) to the terminal for the random access preamble.

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 (20)

A method for transmitting a random access preamble through a Physical Random Access Channel (PRACH)
Determining the number of times the PRACH is repeatedly transmitted when repeatedly transmitting the PRACH through a plurality of uplink subframes and determining a transmission power of the PRACH based on the number of times the PRACH is repeatedly transmitted; And
And repeatedly transmitting the PRACH with the determined transmission power of the PRACH. The method according to claim 1,
Increasing the transmission power of the PRACH when repeated transmission of the PRACH fails;
Repeatedly transmitting the PRACH with the transmission power of the increased PRACH if the transmission power of the increased PRACH is less than the maximum transmission power; And
Further comprising repeatedly transmitting the PRACH by increasing the number of times the PRACH is repeatedly transmitted if the transmission power of the increased PRACH is greater than the maximum transmission power. The method according to claim 1,
Increasing the number of times the PRACH is repeatedly transmitted when the transmission of the PRACH fails;
Repeatedly transmitting the PRACH with the number of times that the increased PRACH is repeatedly transmitted if the number of times that the increased PRACH is repeated is less than a maximum value; And
If the number of times that the increased PRACH is repeatedly transmitted is greater than a maximum value, repeatedly transmitting the PRACH by increasing the transmission power of the PRACH. The method according to claim 1,
The step of determining the transmission power of the PRACH determines a transmission power of the PRACH using Equation (1) below,
(1) P PRACH = min {
Figure pat00022
, PREAMBLE_RECEIVED_TARGET_POWER +
Figure pat00023
- 10logM n } _ [dBm]
In the above equation (1), P PRACH is the transmission power of the PRACH,
Figure pat00024
PREAMBLE_RECEIVED_TARGET_POWER is the target preamble reception power,
Figure pat00025
Is a downlink path loss, and M n is the number of times the PRACH is repeatedly transmitted. The method according to claim 1,
The step of determining the transmission power of the PRACH determines the transmission power of the PRACH using Equation (2) below,
(2) P PRACH = min {
Figure pat00026
, PREAMBLE_RECEIVED_TARGET_POWER +
Figure pat00027
} _ [dBm]
In the above equation (2), P PRACH is the transmission power of the PRACH,
Figure pat00028
Is the maximum transmission power,
Figure pat00029
Is a downlink path loss, and PREAMBLE_RECEIVED_TARGET_POWER is determined using the following equation (3)
(3) PREAMBLE_RECEIVED_TARGET_POWER = preambleInitialReceivedTargetPower + DELTA_PREAMBLE + DELTA_PREAMBLE_REPETITION + (PREAMBLE_TRANSMISSION_COUNTER - 1) * powerRampingStep
In the above equation (3), preambleInitialReceivedTargetPower And DELTA_PREAMBLE_REPETITION is a value determined based on the number of times the PRACH is repeatedly transmitted, and PREAMBLE_TRANSMISSION_COUNTER is a value determined based on the transmission of the PRACH ≪ / RTI > The method according to claim 1,
The step of determining the transmission power of the PRACH determines a transmission power of the PRACH using Equation (4) below,
(4) P PRACH = min {
Figure pat00030
, PREAMBLE_RECEIVED_TARGET_POWER +
Figure pat00031
} _ [dBm]
In the above equation (4), P PRACH is the transmission power of the PRACH,
Figure pat00032
Is the maximum transmission power,
Figure pat00033
Is the downlink path loss, PREAMBLE_RECEIVED_TARGET_POWER is determined using equation (5) below,
(5) PREAMBLE_RECEIVED_TARGET_POWER = preambleInitialReceivedTargetPower + DELTA_PREAMBLE + (PREAMBLE_TRANSMISSION_COUNTER - 1) * powerRampingStep
In the above equation (5), preambleInitialReceivedTargetPower And PRAMBLE_TRANSMISSION_COUNTER is the number of attempts to transmit the PRACH, and the preambleInitialReceivedTargetPower is the number of times the PRACH is repeatedly transmitted from the base station to the base station ≪ / RTI > The method according to claim 1,
The step of determining the transmission power of the PRACH determines the transmission power of the PRACH using Equation (6) below,
(6) P PRACH = min {
Figure pat00034
, PREAMBLE_RECEIVED_TARGET_POWER +
Figure pat00035
} _ [dBm]
In Equation (6), P PRACH is the transmission power of the PRACH,
Figure pat00036
Is the maximum transmission power,
Figure pat00037
Is the downlink path loss, and PREAMBLE_RECEIVED_TARGET_POWER is determined using the following equation (7)
(7) PREAMBLE_RECEIVED_TARGET_POWER = preambleInitialReceivedTargetPower + DELTA_PREAMBLE + (PREAMBLE_TRANSMISSION_COUNTER - 1) * powerRampingStep
In the above equation (5), preambleInitialReceivedTargetPower And the powerRampingStep is a value received by the upper layer signaling, DELTA_PREAMBLE is a value determined according to the format of the random access preamble, PREAMBLE_TRANSMISSION_COUNTER is the number of times the PRACH is attempted to be transmitted, and the powerRampingStep is the number of times the PRACH is repeatedly transmitted Or based on the number of times the PRACH is repeatedly transmitted at the base station.
A method for a base station to transmit setting information on a transmission power of a physical random access channel (PRACH) to a terminal,
Determining setting information on the transmission power of the PRACH based on the number of times the PRACH is repeatedly transmitted in the terminal; And
And transmitting configuration information on the transmission power of the PRACH to the terminal through higher layer signaling. 9. The method of claim 8,
The transmission power of the PRACH in the UE is determined using the following equation (8)
(8) P PRACH = min {
Figure pat00038
, PREAMBLE_RECEIVED_TARGET_POWER +
Figure pat00039
} _ [dBm]
In Equation (8), P PRACH is the transmission power of the PRACH,
Figure pat00040
Is the maximum transmission power,
Figure pat00041
Is a downlink path loss, PREAMBLE_RECEIVED_TARGET_POWER is determined using Equation (9) below,
(9) PREAMBLE_RECEIVED_TARGET_POWER = preambleInitialReceivedTargetPower + DELTA_PREAMBLE + (PREAMBLE_TRANSMISSION_COUNTER - 1) * powerRampingStep
In the above equation (9), preambleInitialReceivedTargetPower And DELTA_PREAMBLE is a value determined according to the format of the random access preamble, PREAMBLE_TRANSMISSION_COUNTER is the number of times the UE has attempted to transmit the PRACH,
Wherein the setting information for the transmission power of the PRACH, which is determined based on the number of times the PRACH is repeatedly transmitted, is preambleInitialReceivedTargetPower . 9. The method of claim 8,
The transmission power of the PRACH at the UE is determined using the following equation (10)
(10) P PRACH = min {
Figure pat00042
, PREAMBLE_RECEIVED_TARGET_POWER +
Figure pat00043
} _ [dBm]
In the above equation (10), P PRACH is the transmission power of the PRACH,
Figure pat00044
Is the maximum transmission power,
Figure pat00045
Is a downlink path loss, PREAMBLE_RECEIVED_TARGET_POWER is determined using Equation (11) below,
(11) PREAMBLE_RECEIVED_TARGET_POWER = preambleInitialReceivedTargetPower + DELTA_PREAMBLE + (PREAMBLE_TRANSMISSION_COUNTER - 1) * powerRampingStep
In Equation (11), preambleInitialReceivedTargetPower And powerRampingStep are values transmitted by upper layer signaling, DELTA_PREAMBLE is a value determined according to the format of the random access preamble, PREAMBLE_TRANSMISSION_COUNTER is the number of times the UE has attempted to transmit the PRACH,
Wherein the setting information for the transmission power of the PRACH, which is determined based on the number of times the PRACH is repeatedly transmitted, is powerRampingStep .
A terminal for transmitting a random access preamble through a Physical Random Access Channel (PRACH)
A controller for determining the number of times the PRACH is repeatedly transmitted when the PRACH is repeatedly transmitted through a plurality of uplink subframes and determining a transmission power of the PRACH based on the number of times the PRACH is repeatedly transmitted; And
And a transmitter for repeatedly transmitting the PRACH with the determined transmission power of the PRACH. 12. The method of claim 11,
Wherein,
When the repeated transmission of the PRACH fails, increases the transmission power of the PRACH and repeatedly transmits the PRACH with the transmission power of the increased PRACH if the transmission power of the increased PRACH is less than the maximum transmission power, And if the transmission power of the increased PRACH is greater than the maximum transmission power, repeats the transmission of the PRACH by increasing the number of times the PRACH is repeatedly transmitted. 12. The method of claim 11,
Wherein,
When the transmission of the PRACH fails, the number of times the PRACH is repeatedly transmitted is increased, and if the number of times the PRACH is repeatedly transmitted is less than the maximum value, And repeatedly transmitting the PRACH by increasing the transmission power of the PRACH if the number of times that the increased PRACH is repeatedly transmitted is greater than the maximum value. 12. The method of claim 11,
The control unit determines the transmission power of the PRACH using Equation (1) below,
(12) P PRACH = min {
Figure pat00046
, PREAMBLE_RECEIVED_TARGET_POWER +
Figure pat00047
- 10logM n } _ [dBm]
In the above equation (1), P PRACH is the transmission power of the PRACH,
Figure pat00048
PREAMBLE_RECEIVED_TARGET_POWER is the target preamble reception power,
Figure pat00049
Is a downlink path loss, and M n is the number of times the PRACH is repeatedly transmitted. 12. The method of claim 11,
The control unit determines the transmission power of the PRACH using the following equation (13)
(13) P PRACH = min {
Figure pat00050
, PREAMBLE_RECEIVED_TARGET_POWER +
Figure pat00051
} _ [dBm]
In the above equation (13), P PRACH is the transmission power of the PRACH,
Figure pat00052
Is the maximum transmission power,
Figure pat00053
Is a downlink path loss, and PREAMBLE_RECEIVED_TARGET_POWER is determined using the following equation (14)
(14) PREAMBLE_RECEIVED_TARGET_POWER = preambleInitialReceivedTargetPower + DELTA_PREAMBLE + DELTA_PREAMBLE_REPETITION + (PREAMBLE_TRANSMISSION_COUNTER - 1) * powerRampingStep
In the above equation (14), preambleInitialReceivedTargetPower DELTA_PREAMBLE_REPETITION is a value determined based on the number of times the PRACH is repeatedly transmitted, PREAMBLE_TRANSMISSION_COUNTER is a value determined based on the number of times the PRACH is repeatedly transmitted, and PREAMBLE_TRANSMISSION_COUNTER is a value received by the upper layer signaling, DELTA_PREAMBLE is a value determined according to the format of the random access preamble, And the number of times the transmission is attempted. 12. The method of claim 11,
The controller determines the transmission power of the PRACH using Equation (15) below,
(15) P PRACH = min {
Figure pat00054
, PREAMBLE_RECEIVED_TARGET_POWER +
Figure pat00055
} _ [dBm]
In the above equation (15), P PRACH is the transmission power of the PRACH,
Figure pat00056
Is the maximum transmission power,
Figure pat00057
Is the downlink path loss, and PREAMBLE_RECEIVED_TARGET_POWER is determined using the following equation (16)
(16) PREAMBLE_RECEIVED_TARGET_POWER = preambleInitialReceivedTargetPower + DELTA_PREAMBLE + (PREAMBLE_TRANSMISSION_COUNTER - 1) * powerRampingStep
In the above equation (16), preambleInitialReceivedTargetPower And PRAMBLE_TRANSMISSION_COUNTER is the number of attempts to transmit the PRACH, and the preambleInitialReceivedTargetPower is the number of times the PRACH is repeatedly transmitted at the base station Based on the number of times the mobile terminal is connected. 12. The method of claim 11,
The controller determines the transmission power of the PRACH using Equation (17) below,
(17) P PRACH = min {
Figure pat00058
, PREAMBLE_RECEIVED_TARGET_POWER +
Figure pat00059
} _ [dBm]
In the above equation (17), P PRACH is the transmission power of the PRACH,
Figure pat00060
Is the maximum transmission power,
Figure pat00061
Is the downlink path loss, and PREAMBLE_RECEIVED_TARGET_POWER is determined using the following equation (18)
(18) PREAMBLE_RECEIVED_TARGET_POWER = preambleInitialReceivedTargetPower + DELTA_PREAMBLE + (PREAMBLE_TRANSMISSION_COUNTER - 1) * powerRampingStep
In the above equation (18), preambleInitialReceivedTargetPower And powerRampingStep is a value received by upper layer signaling, DELTA_PREAMBLE is a value determined according to the format of the random access preamble, PREAMBLE_TRANSMISSION_COUNTER is the number of times the PRACH is attempted to be transmitted, and the powerRampingStep is a value Or is determined based on the number of times the PRACH is repeatedly transmitted at the base station.
A base station for transmitting configuration information on a transmission power of a physical random access channel (PRACH) to a terminal,
A control unit for determining setting information on the transmission power of the PRACH based on the number of times the PRACH is repeatedly transmitted from the terminal; And
And a transmitter for transmitting setting information on the transmission power of the PRACH to the terminal through higher layer signaling. 19. The method of claim 18,
The transmission power of the PRACH in the UE is determined using the following equation (19)
(19) P PRACH = min {
Figure pat00062
, PREAMBLE_RECEIVED_TARGET_POWER +
Figure pat00063
} _ [dBm]
In the above equation (19), P PRACH is the transmission power of the PRACH,
Figure pat00064
Is the maximum transmission power,
Figure pat00065
Is a downlink path loss, and PREAMBLE_RECEIVED_TARGET_POWER is determined using the following equation (20)
(20) PREAMBLE_RECEIVED_TARGET_POWER = preambleInitialReceivedTargetPower + DELTA_PREAMBLE + (PREAMBLE_TRANSMISSION_COUNTER - 1) * powerRampingStep
In the above equation (20), preambleInitialReceivedTargetPower And powerRampingStep are values transmitted by upper layer signaling, DELTA_PREAMBLE is a value determined according to the format of the random access preamble, PREAMBLE_TRANSMISSION_COUNTER is the number of times the UE has attempted to transmit the PRACH,
Wherein the setting information for the transmission power of the PRACH, which is determined based on the number of times the PRACH is repeatedly transmitted, is preambleInitialReceivedTargetPower . 19. The method of claim 18,
The transmission power of the PRACH in the UE is determined using the following equation (21)
(21) P PRACH = min {
Figure pat00066
, PREAMBLE_RECEIVED_TARGET_POWER +
Figure pat00067
} _ [dBm]
In Equation (21), P PRACH is the transmission power of the PRACH,
Figure pat00068
Is the maximum transmission power,
Figure pat00069
Is the downlink path loss, and PREAMBLE_RECEIVED_TARGET_POWER is determined using the following equation (22)
(22) PREAMBLE_RECEIVED_TARGET_POWER = preambleInitialReceivedTargetPower + DELTA_PREAMBLE + (PREAMBLE_TRANSMISSION_COUNTER - 1) * powerRampingStep
In the above equation (22), preambleInitialReceivedTargetPower And powerRampingStep are values transmitted by upper layer signaling, DELTA_PREAMBLE is a value determined according to the format of the random access preamble, PREAMBLE_TRANSMISSION_COUNTER is the number of times the UE has attempted to transmit the PRACH,
Wherein the setting information for the transmission power of the PRACH, which is determined based on the number of times the PRACH is repeatedly transmitted, is powerRampingStep .
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KR20190117690A (en) * 2017-03-22 2019-10-16 엘지전자 주식회사 Method and apparatus for transmitting and receiving random access preamble in wireless communication system
CN110393000A (en) * 2017-02-20 2019-10-29 Lg电子株式会社 For sending or receiving the method and its equipment of signal in a wireless communication system
KR20220024243A (en) * 2018-03-30 2022-03-03 주식회사 케이티 Methods for controlling uplink data channel trasmission power and Apparatus thereof
US11617214B2 (en) 2017-01-06 2023-03-28 Samsung Electronics Co., Ltd. Method for random access, user equipment and base station

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Publication number Priority date Publication date Assignee Title
US11617214B2 (en) 2017-01-06 2023-03-28 Samsung Electronics Co., Ltd. Method for random access, user equipment and base station
US11903038B2 (en) 2017-01-06 2024-02-13 Samsung Electronics Co., Ltd. Method for random access, user equipment and base station
CN110393000A (en) * 2017-02-20 2019-10-29 Lg电子株式会社 For sending or receiving the method and its equipment of signal in a wireless communication system
US11129202B2 (en) 2017-02-20 2021-09-21 Lg Electronics Inc. Method for transmitting or receiving signal in wireless communication system and device therefor
KR20190117690A (en) * 2017-03-22 2019-10-16 엘지전자 주식회사 Method and apparatus for transmitting and receiving random access preamble in wireless communication system
KR20200077606A (en) * 2017-03-22 2020-06-30 엘지전자 주식회사 Method for transmitting and receiving random access preamble in wireless communication system and apparatus therefor
US11096222B2 (en) 2017-03-22 2021-08-17 Lg Electronics Inc. Method for transmitting and receiving random access preamble in wireless communication system and apparatus therefor
KR20220024243A (en) * 2018-03-30 2022-03-03 주식회사 케이티 Methods for controlling uplink data channel trasmission power and Apparatus thereof

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