KR101807818B1 - Method and apparatus for configuring resource of random access channel in wireless communication system - Google Patents

Abstract

The base station of the wireless communication system determines an index of a radio resource block to which the plurality of random access channels are allocated so that the radio resource blocks of the plurality of random access channels have a symmetric structure in the available uplink radio resource block, And allocates the plurality of random access channels to a position corresponding to an index of a resource block.

Description

TECHNICAL FIELD [0001] The present invention relates generally to a method and apparatus for configuring a resource of a random access channel in a wireless communication system,

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a random access channel resource configuration method and apparatus in a wireless communication system, and more particularly, to a frequency resource configuration method and apparatus of a random access channel in a wireless communication system.

In a wireless communication system, a random access procedure is performed for initial timing synchronization and power control with a base station, an uplink resource request, a handover, and the like.

A random access channel is used as an uplink control channel for transmitting and receiving a preamble between a UE and a base station in a random access procedure. An uplink control channel allocated to a radio frame for transmitting a preamble for random access is a random access channel, and a random access channel is referred to as a PRACH (physical random access channel).

If the transmission mode of the wireless communication system is a time division duplex (TDD) scheme, a plurality of PRACHs can be allocated in the uplink subframe according to the uplink and downlink frame configurations. At this time, when the PRACH configuration density can not be multiplexed in a time domain one uplink subframe through the subframe index due to shortage of time domain resources constituted of uplink subframes, a plurality of The PRACH can be multiplexed, and a plurality of PRACHs can be included in the frequency domain.

When a plurality of PRACHs are included in the frequency domain, a radio resource block to which a plurality of PRACHs are allocated is determined. At this time, there is a need for an effective method for determining a radio resource block to which a plurality of PRACHs are allocated. For example, a small size radio resource block hole may be generated according to a plurality of PRACH allocations in an available radio resource block. When such a radio resource block hole is generated, the data traffic can not be allocated in succession to the radio resource blocks in the data traffic transmission, which makes it difficult to efficiently operate radio resources. In addition, when the same number of PRACHs as the adjacent cells are configured and have the same TDD frame structure, interference may occur with the PRACH of the neighboring cell, and the UE may fail random access.

SUMMARY OF THE INVENTION It is an object of the present invention to provide a method and apparatus for configuring resources of a random access channel in a wireless communication system capable of efficiently operating a radio resource block available in a wireless communication system and increasing the probability of a random access success.

According to one embodiment of the present invention, a method for constructing a frequency domain resource of a random access channel in a base station of a wireless communication system is provided. A method of configuring a resource of a random access channel includes determining an index of a radio resource block to which the plurality of random access channels are allocated so that a radio resource block of a plurality of random access channels is symmetric in an available uplink radio resource block, And allocating the plurality of random access channels to a position corresponding to an index of the determined radio resource block.

Wherein the step of determining comprises: determining an indication value indicating a position of an offset value designating a position of a first random access channel among the plurality of random access channels; and determining the offset value, the indication value, And calculating an index of a radio resource block to which the random access channel is allocated by using the resource index.

The indication value may indicate whether the offset value is located in an upper area or a lower area based on the center radio resource block in the available uplink radio resource block.

The indication value may have a value of 1 or -1 according to the position of the offset value.

이며, The step of calculating an index of a radio resource block to which each random access channel is allocated may be performed using Equation

Lt;

는 하나의 랜덤 접속 채널이 점유하는 무선자원블록의 수를 나타내고, 상기

은 상기 옵셋 값이고,

은 상기 지시값이며, 상기

는 상기 랜덤 접속 채널이 할당되는 무선자원블록의 인덱스를 나타낼 수 있다. The floor (x) returns the largest integer among integers less than or equal to the parameter x, f _RA denotes a frequency resource index of the random access channel,

Represents the number of radio resource blocks occupied by one random access channel,

Is the offset value,

Is the above instruction value,

May indicate an index of a radio resource block to which the random access channel is allocated.

The indication value is 1 when the offset value is located in the upper region based on the middle radio resource block in the available uplink radio resource block, and the offset value is 1 when the position is located in the upper And may be -1 if it is located in a sub-region.

The determining may further comprise receiving the offset value from an upper layer.

Wherein the random access channel resource configuration method allocates the same number of random access channels as the neighboring cells and allocates the locations of the plurality of random access channels differently from the neighboring cells in the time domain, As shown in FIG.

According to another embodiment of the present invention, there is provided an apparatus for configuring a frequency domain resource of a random access channel in a wireless communication system. The resource configuring device of the random access channel includes a processor and a transceiver. The processor determines a radio resource block to which the plurality of random access channels are allocated such that a plurality of random access channel radio resource blocks are symmetric with respect to a center radio resource block in an available uplink radio resource block. The transceiver transmits resource configuration information of the plurality of random access channels to all terminals in the cell.

Wherein the processor is configured to calculate a random access channel by using an offset value designating a position of a first random access channel among the plurality of random access channels, an indication value indicating a position of the offset value, and a frequency resource index of each random access channel, An index of a radio resource block to be allocated can be determined.

The indication value may have a value of 1 or -1 depending on whether the offset value is located in an upper area or a lower area based on the middle radio resource block in the available uplink radio resource block.

The processor may allocate the positions of the plurality of random access channels differently from the neighboring cells in the time domain when the processor forms the same number of random access channels as the neighboring cells and has the same frame structure.

The location of the plurality of random access channels in the time domain includes a first marker, a second marker, and a third marker, wherein the first marker indicates one of a radio frame, an even radio frame, and an odd radio frame, The second marker may indicate a front half of a half frame or a back half of the frame, and the third marker may indicate a subframe index at which a random access preamble starts.

According to the embodiment of the present invention, by arranging the frequency domain radio resource configuration for the PRACH in an intuitive structure, the random access channel configuration in the different cells can be made easier, and the preamble signals transmitted through the uplink PRACH The reliability of the system can be improved by reducing interference between other adjacent cells and increasing the probability of success of the random access.

인 경우에 수학식 1을 이용할 때

의 값에 따른 가용한 PRACH의 수를 나타낸 도면이다.
도 10은 LTE TDD 모드에서 시스템 채널 대역이 10MHz이고

인 경우에 수학식 1을 이용할 때 PRACH 주파수 옵셋 값에 따른 가용한 PRACH의 수를 나타낸 도면이다.
도 11은 LTE TDD 모드에서 시스템 채널 대역이 5MHz이고

인 경우에 수학식 1을 이용할 때 PRACH 주파수 옵셋 값에 따른 가용한 PRACH의 수를 나타낸 도면이다.
도 12는 본 발명의 실시 예에 따른 LTE TDD 모드에서 PRACH 주파수 옵셋 값이 상향링크 채널 주파수 대역 범위 내에서 하위 영역에 위치하는 경우 수학식 2에 따라 상향링크 서브프레임에 PRACH을 할당하는 일 예를 나타낸 도면이다.
도 13은 본 발명의 실시 예에 따른 LTE TDD 모드에서 PRACH 주파수 옵셋 값이 상향링크 채널 주파수 대역 범위 내에서 상위 영역에 위치하는 경우 수학식 2에 따라 상향링크 서브프레임에 PRACH를 할당하는 일 예를 나타낸 도면이다.
도 14 내지 도 16은 각각 본 발명의 실시 예에 따른 PRACH의 주파수 도메인 자원 구성 방법으로 수학식 2를 이용하는 경우에 LTE TDD 모드에서 PRACH 주파수 옵셋 값에 따른 가용한 PRACH의 수를 나타낸 도면이다.
도 17은 본 발명의 실시 예에 따른 랜덤 접속 채널의 자원 구성 장치를 나타낸 도면이다. 1 is a diagram illustrating an example of a format of a random access preamble based on OFDM (Orthogonal Frequency Division Multiplexing) in a wireless communication system according to an embodiment of the present invention.
2 is a diagram illustrating a random access procedure according to an embodiment of the present invention.
3 is a diagram illustrating an example of a PRACH resource configuration in a wireless communication system according to an embodiment of the present invention.
4 is a diagram illustrating an example of a PRACH resource configuration in a frequency division duplex (FDD) uplink radio frame in a wireless communication system according to an embodiment of the present invention.
5 is a diagram illustrating an example of a PRACH resource configuration in a time division duplex (TDD) radio frame in a wireless communication system according to an embodiment of the present invention.
6 is a diagram illustrating PRACH multiplexing of Tables 1 and 2 using a PRACH configuration version in a PRACH channel configuration of neighboring different cells.
FIG. 7 is a diagram illustrating a case where a PRACH frequency offset value is located in a lower region within an available uplink channel frequency band according to Equation 1 in an LTE TDD mode according to an embodiment of the present invention. PRACH is allocated to the base station.
8 is a diagram illustrating a case where a PRACH frequency offset value is located in an upper region within an available uplink channel frequency band in an LTE TDD mode according to an embodiment of the present invention, Fig.
9 shows a system channel bandwidth of 20 MHz in the LTE TDD mode,

When Equation (1) is used

And the number of available PRACHs according to the value of the PRACH.
FIG. 10 is a diagram illustrating a case where the system channel bandwidth is 10 MHz in the LTE TDD mode

The number of available PRACHs according to the PRACH frequency offset value when Equation (1) is used.
FIG. 11 is a diagram illustrating a case where the system channel bandwidth is 5 MHz in the LTE TDD mode

The number of available PRACHs according to the PRACH frequency offset value when Equation (1) is used.
12 illustrates an example of allocating a PRACH to an uplink subframe according to Equation (2) when a PRACH frequency offset value is located in a sub-region within an uplink channel frequency band in an LTE TDD mode according to an embodiment of the present invention Fig.
13 illustrates an example of allocating a PRACH to an uplink subframe according to Equation (2) when a PRACH frequency offset value is located in an upper region within an uplink channel frequency band in an LTE TDD mode according to an embodiment of the present invention Fig.
FIGS. 14 to 16 are diagrams showing the number of available PRACHs according to the PRACH frequency offset value in the LTE TDD mode when Equation (2) is used as a frequency domain resource configuration method of the PRACH according to the embodiment of the present invention.
FIG. 17 is a diagram illustrating a random access channel resource configuration apparatus according to an embodiment of the present invention.

Hereinafter, embodiments of the present invention will be described in detail with reference to the accompanying drawings so that those skilled in the art can easily carry out the present invention. The present invention may, however, be embodied in many different forms and should not be construed as limited to the embodiments set forth herein. In order to clearly illustrate the present invention, parts not related to the description are omitted, and similar parts are denoted by like reference characters throughout the specification.

Throughout the specification and claims, when a section is referred to as "including " an element, it is understood that it does not exclude other elements, but may include other elements, unless specifically stated otherwise.

Throughout the specification, a terminal is referred to as a mobile terminal (MT), a mobile station (MS), an advanced mobile station (AMS), a high reliability mobile station (HR- A subscriber station (SS), a portable subscriber station (PSS), an access terminal (AT), a user equipment (UE) , HR-MS, SS, PSS, AT, UE, and the like.

Also, a base station (BS) is an advanced base station (ABS), a high reliability base station (HR-BS), a node B, an evolved node B, eNodeB), an access point (AP), a radio access station (RAS), a base transceiver station (BTS), a mobile multihop relay (MMR) (RS), a relay node (RN) serving as a base station, an advanced relay station (ARS) serving as a base station, a high reliability relay station (HR) A femto BS, a home Node B, a HNB, a pico BS, a metro BS, a micro BS, ), Etc., and may be all or part of an ABS, a Node B, an eNodeB, an AP, a RAS, a BTS, an MMR-BS, an RS, an RN, an ARS, It may include a negative feature.

The base station may also refer to a base station such as a macro cell, a remote radio head (RRH) cell, a pico cell, a micro cell, a femto cell, .

A method and apparatus for configuring a resource of a random access channel in a wireless communication system according to an embodiment of the present invention will now be described in detail with reference to the drawings.

1 is a diagram illustrating an example of a format of a random access preamble based on OFDM (Orthogonal Frequency Division Multiplexing) in a wireless communication system according to an embodiment of the present invention.

Referring to FIG. 1, a random access preamble includes a cyclic prefix (CP) and a preamble sequence.

The length of the CP or the length of the preamble sequence is defined according to the type of the radio frame to be configured or the attribute of the cell. In 3GPP, the format of the random access preamble is configured by one of the five formats defined by the standard TS36.211.

The base station transmits the channel configuration information of PRACH, which is a random access channel for each cell, to all terminals located in the cell through a broadcast channel.

2 is a diagram illustrating a random access procedure according to an embodiment of the present invention.

2, the UE 100 acquires synchronization from a base station 200 through a Primary Synchronization Signal (PSS) / Secondary Synchronization Signal (SSS) and receives system information through a Broadcasting Channel (BCH) (S210). The system information transmitted through the BCH includes parameters for generating a random access preamble.

The terminal 100 transmits the random access preamble to the base station 200 (S220). The UE 100 selects one preamble sequence to be used as a random access preamble among a plurality of selectable preamble sequences, generates a random access preamble using the selected preamble sequence, and transmits the random access preamble to the base station 200.

The base station 200 detects the received random access preamble and estimates the transmission timing of the random access preamble index-based terminal 100 for matching the uplink synchronization required for data transmission between the terminal 100 and the base station 200. Then, based on the random access preamble detected by the base station 200, it transmits a random access response, which is an access grant message including TA (Timing Advanced) information required for uplink synchronization, to the terminal 100 S230).

After the UE 100 adjusts the uplink timing based on the received random access response, the UE 100 requests the uplink radio resource through the determined uplink radio resource to the base station 200 (S240).

A random access preamble transmission opportunity in a time domain and a PRACH in which a radio resource position in a frequency domain is appropriately configured are defined in a radio frame or a random access preamble transmission / reception in a subframe so that a series of random access processes are performed.

3 is a diagram illustrating an example of a PRACH resource configuration in a wireless communication system according to an embodiment of the present invention.

Referring to FIG. 3, the PRACH uses time and frequency as radio resources. One PRACH per frame or every subframe or slot is located at an arbitrary frequency resource.

One frame includes a plurality of subframes, and one subframe includes a plurality of slots. A slot includes a plurality of symbols in the time domain and a plurality of resource blocks in the frequency domain. In a resource block (RB), a frequency resource may include a plurality of subcarriers and a time resource may include one symbol. For example, in the example of the OFDM transmission scheme, when a RB consisting of k subcarriers and 1 symbol number is used as a unit, one PRACH can be composed of N RBs.

FIG. 4 is a diagram illustrating an example of a PRACH resource configuration in a frequency division duplex (FDD) uplink radio frame in a wireless communication system according to an embodiment of the present invention. FIG. 4 is a diagram illustrating an example of a PRACH resource configuration in a time division duplex (TDD) radio frame in FIG.

4 and 5, there are FDD mode and TDD mode in the transmission mode in the wireless communication system. The FDD mode supports uplink and downlink communication by distinguishing uplink and downlink transmission / reception resources by frequency. The TDD mode supports uplink and downlink communication by distinguishing uplink and downlink transmission / reception resources with time.

Referring to FIG. 4, in the FDD mode, uplink and downlink communication are classified by frequencies. Therefore, in an FDD uplink radio frame, all subframes constituting one radio frame may be configured as uplink subframes. One PRACH may be configured for each uplink subframe of the FDD uplink radio frame.

On the other hand, referring to FIG. 5, in the TDD mode, the uplink and downlink communication are separated by time, so that the TDD uplink radio frame may be composed of an uplink subframe and a downlink subframe. The number of uplink subframes and downlink subframes may be the same or different. One PRACH may be configured for each uplink subframe of the TDD radio frame. One PRACH may be configured for each uplink subframe of the TDD radio frame.

Table 1 and Table 2 show the PRACH configuration for the preamble format 0 of the random access preamble in the LTE (Long Term Evolution) FDD and TDD modes.

[Table 1]

As shown in Table 1, the PRACH configuration method of the LTE FDD mode specifies a random access preamble transmission opportunity position through a given PRACH setting, such as a PRACH Configuration Index list, depending on the preamble sequence length. A frame number (System frame number) and a subframe index (Subframe number) as a time domain position indicating a transmission opportunity in which random access preamble transmission can be performed are classified into a PRACH Corresponding to the configuration index. The frame number indicates an even number or an odd number (Odd) or both (Any).

The frequency domain location of the PRACH radio resource of the frame is the same for all PRACHs and can be uniformly configured at the base station. The PRACH configuration index and the frequency domain location of the PRACH radio resource are transmitted to the UE through a BCH (system information broadcast message).

 [Table 2]

Unlike the FDD mode, in the TDD mode, the PRACH configuration density (D _RA ) and the PRACH configuration version (version _RA ) correspond to the PRACH configuration index with one parameter set according to the frame structure and the preamble format. Here, D _RA represents the number of PRACH channels per TDD radio frame, and R _RA is an index for varying the position of the time domain of neighboring inter-cell PRACH as a version number of several different mapping schemes in the time domain. The PRACH configuration index is transmitted to the UE through a BCH, i.e., a system information broadcast message.

6 is a diagram illustrating PRACH multiplexing of Tables 1 and 2 using a PRACH configuration version in a PRACH channel configuration of neighboring different cells.

Referring to FIG. 6, neighboring cells are assigned different R _RAs . That is, the positions of the time domains of neighboring inter-cell PRACHs are different from each other.

In the TDD mode, a plurality of PRACH resources can be allocated in the uplink subframe according to the frame configuration. The PRACH channel mapping is performed through the time domain and frequency domain configuration schemes. In this case, when the D _RA can not be multiplexed in the subframe index (number) in one uplink subframe in the time domain due to shortage of time domain resources, a plurality of PRACHs are multiplexed in the frequency domain under the premise that the PRACH does not overlap And a plurality of PRACHs can be included in the frequency domain.

That is, time-domain multiplexing is preferentially applied to the random access resources according to the PRACH configuration setting, and if the PRACH resource allocation can not be performed without overlapping in the time domain with respect to a given D _RA , frequency domain multiplexing is additionally utilized do.

를 결정하는 방법은 수학식 1에 의해 결정된다. In the LTE TDD mode, the RACH index to which the PRACH for frequency domain multiplexing of the PRACH is allocated

Is determined by Equation (1).

은 가용한 상향링크 RB의 수를 의미하고,

는 PRACH 주파수 옵셋으로, 다수의 랜덤 접속 채널 중에서 첫 번째 랜덤 접속 채널의 위치를 나타내며, PRACH 전송을 위해 상위 계층에서 알려주는 RB 인덱스를 의미한다.

는 PRACH의 주파수 자원 인덱스를 의미한다. 해당 시간 영역의 랜덤 접속 프리앰블 전송기회에 할당된 전체 PRACH의 채널 수에 따라

의 최대값이 정해진다. 그리고

는 floor 연산을 의미하며, 매개 변수 x보다 작거나 같은 정수 중에서 가장 큰 정수를 반환한다. here

Denotes the number of available uplink RBs,

Denotes a position of a first random access channel among a plurality of random access channels in a PRACH frequency offset, and denotes an RB index informed by an upper layer for PRACH transmission.

Denotes a PRACH frequency resource index. Depending on the total number of PRACH channels allocated to the random access preamble transmission opportunity in the time domain

Is determined. And

Denotes the floor operation, and returns the largest integer among integers less than or equal to the parameter x.

In the LTE, the number of RB occupied by each random access preamble, i.e., one PRACH occupies 6.

값이 가용한 상향링크 채널 주파수 대역 범위 내에서 하위 영역(Lower region)에 위치하는 경우에 상향링크 서브프레임에 PRACH를 할당하는 일 예를 나타낸 도면이다. FIG. 7 is a flow chart illustrating a method for transmitting a signal according to Equation 1 in an LTE TDD mode according to an embodiment of the present invention.

When a value is located in a lower region within an available uplink channel frequency band range, a PRACH is allocated to an uplink subframe.

(f_RA = 0)이고, 가용한 PRACH의 최대 개수가 6인 경우를 나타내며, 따라서 f_RA가 0, 1, 2, 3, 4, 5일 때 PRACH의 배치 구조를 나타낸다. 7 (A) shows an offset value designating the position of the first PRACH

(f _RA = 0) and the maximum number of usable PRACHs is 6. Therefore, we show the arrangement structure of PRACH when f _RA is 0, 1, 2, 3, 4,

에 해당하는 주파수 영역에서 RB 인덱스 0에 해당하는 최하위에 할당되고 f_RA의 인덱스가 1인 PRACH #1은 RB 인덱스

에 해당하는 최상위에 할당된다. f_RA의 인덱스가 2인 PRACH #2는 RB 인덱스 6에 해당하는 위치에 할당되고, f_RA의 인덱스가 3인 PRACH #3은 RB 인덱스

에 해당하는 위치에 할당된다. 그리고 f_RA의 인덱스가 4인 PRACH #4는 RB 인덱스 12에 해당하는 위치에 할당되고, f_RA의 인덱스가 5인 PRACH #5는 RB 인덱스

에 해당하는 위치에 할당된다. 이렇게 함으로써, f_RA의 인덱스에 따라 PRACH가 할당되는 RB 위치가 가운데 위치한 RB를 중심으로 서로 대칭이 된다.As shown in Fig. 7 (A), PRACH # 0 the index is 0, f _RA according to equation (1) is

Assigned to the least significant for the RB index 0 in the frequency domain to be the index of the PRACH f _RA # 1 is 1 RB index

Quot; is assigned to the highest level. is the index of the PRACH f _RA 2 # 2 is allocated to a position corresponding to 6 RB index, a PRACH # 3, the index of f _RA is 3 RB index

As shown in FIG. And a PRACH # 4, the index of f _RA 4 are assigned to the position corresponding to the RB index 12, a PRACH # 5, the index of f _RA 5 are RB index

As shown in FIG. By doing so, the RB where the PRACH is allocated according to an index of f _RA are symmetrical to each other around the RB in the middle.

(f_RA = 0)이고, 가용한 PRACH의 최대 개수가 6인 경우이며, 따라서 f_RA가 0, 1, 2, 3, 4, 5일 때 PRACH의 배치 구조를 나타낸다. 7 (B)

(f _RA = 0), and the maximum number of usable PRACHs is 6. Therefore, the arrangement structure of PRACH is shown when f _RA is 0, 1, 2, 3, 4,

에 해당하는 주파수 영역에서 RB 인덱스 18에 해당하는 위치에 할당되고 f_RA의 인덱스가 1인 PRACH #1은 RB 인덱스

에 해당하는 위치에 할당된다. f_RA의 인덱스가 2인 PRACH #2는 RB 인덱스 24에 해당하는 위치에 할당되고, f_RA의 인덱스가 3인 PRACH #3은 RB 인덱스

에 해당하는 위치에 할당된다. 그리고 f_RA의 인덱스가 4인 PRACH #4는 RB 인덱스 30에 해당하는 위치에 할당되고, f_RA의 인덱스가 5인 PRACH #5는 RB 인덱스

에 해당하는 위치에 할당된다. 이렇게 함으로써, f_RA의 인덱스에 따라 PRACH가 할당되는 RB 위치가 가운데 위치한 RB를 중심으로 서로 대칭이 된다.As shown in FIG. 7 (B), according to Equation (1), PRACH # 0 with index f _RA of 0

Assigned to the position corresponding to the RB index in the frequency domain 18, which is the index of the PRACH f _RA # 1 is 1 RB index

As shown in FIG. is the index of the PRACH f _RA 2 # 2 is assigned to the position corresponding to the RB index 24, a PRACH # 3, the index of f _RA is 3 RB index

As shown in FIG. And a PRACH # 4, the index of f _RA 4 are assigned to the position corresponding to the RB index 30, a PRACH # 5, the index of f _RA 5 are RB index

As shown in FIG. By doing so, the RB where the PRACH is allocated according to an index of f _RA are symmetrical to each other around the RB in the middle.

(f_RA = 0)이고, 가용한 PRACH의 최대 개수가 6이지만,

의 최대값이 2인 경우이며, 따라서 f_RA가 0, 1, 2일 때 PRACH의 배치 구조를 나타낸다. 7 (C)

( _fRA = 0) and the maximum number of usable PRACHs is 6,

Is 2, and thus the arrangement structure of the PRACH is shown when f _RA is 0, 1, and 2.

는 0이 되므로, f_RA의 인덱스가 0인 PRACH #0은

에 해당하는 주파수 영역에서 RB 인덱스 0에 해당하는 최하위에 할당된다. 그리고 수학식 1에 따라서 f_RA의 인덱스가 1인 PRACH #1은 RB 인덱스

에 해당하는 최상위에 할당되며, f_RA의 인덱스가 2인 PRACH #2는 RB 인덱스 6에 해당되는 위치에 할당된다. According to Equation (1), the first PRACH

0 ", PRACH # 0 with an index of f _RA is 0

Is assigned to the lowest rank corresponding to the RB index 0 in the frequency domain corresponding to the RB index. According to Equation (1), PRACH # 1 with an index of f _RA is 1, and RB index

Assigned to the top-level corresponding to, a PRACH # 2, the index of f _RA 2 is allocated to a position corresponding to the RB index 6.

값이 가용한 상향링크 채널 주파수 대역 범위 내에서 상위 영역(Upper region)에 위치하는 경우에 상향링크 서브프레임에 PRACH를 할당하는 일 예를 나타낸 도면이다. FIG. 8 is a block diagram of an embodiment of the present invention in an LTE TDD mode

Values are located in an upper region within an available uplink channel frequency band range, a PRACH is allocated to an uplink subframe.

(f_RA = 0)이고, 가용한 PRACH의 최대 개수가 6인 경우이며, 따라서 f_RA가 0, 1, 2, 3, 4, 5일 때 PRACH의 배치 구조를 나타낸다. 8 (A) shows an offset value designating the position of the first PRACH

(f _RA = 0), and the maximum number of usable PRACHs is 6. Therefore, the arrangement structure of PRACH is shown when f _RA is 0, 1, 2, 3, 4,

에 해당하는 주파수 영역에서 RB 인덱스

에 해당하는 위치에 할당되고 f_RA의 인덱스가 1인 PRACH #1은 RB 인덱스 12에 해당하는 위치에 할당된다. f_RA의 인덱스가 2인 PRACH #2는 RB 인덱스

에 해당하는 위치에 할당되고, f_RA의 인덱스가 3인 PRACH #3은 RB 인덱스 6에 해당하는 위치에 할당된다. 그리고 f_RA의 인덱스가 4인 PRACH #4는 RB 인덱스

에 해당하는 최상위에 할당되고, f_RA의 인덱스가 5인 PRACH #5는 RB 인덱스 0에 해당하는 최하위에 할당된다. 이렇게 함으로써, f_RA의 인덱스에 따라 PRACH가 할당되는 RB 위치가 가운데 위치한 RB를 중심으로 서로 대칭이 된다. As shown in Fig. 8 (A), according to Equation (1), PRACH # 0 with an index of f _RA is 0

RB index < RTI ID = 0.0 >

Assigned to the position corresponding to the # 1 and the PRACH is of the index of f _RA 1 is assigned to the position corresponding to the RB index 12. PRACH # 2 with an index of f _RA is 2,

Is assigned to a position corresponding to, the index of the PRACH f _RA 3 # 3 is allocated to a position corresponding to the RB index 6. And PRACH # 4 with index fRA of f _RA is indexed by RB index

Is assigned to the top-level corresponding to, a PRACH # 5, the index of f _RA 5 are assigned to the least significant for the RB index 0. By doing so, the RB where the PRACH is allocated according to an index of f _RA are symmetrical to each other around the RB in the middle.

(f_RA = 0)이고, 가용한 PRACH의 최대 개수가 6인 경우이며, 따라서 f_RA가 0, 1, 2, 3, 4, 5일 때 PRACH의 배치 구조를 나타낸다. 8 (B)

(f _RA = 0), and the maximum number of usable PRACHs is 6. Therefore, the arrangement structure of PRACH is shown when f _RA is 0, 1, 2, 3, 4,

에 해당하는 주파수 영역에서 RB 인덱스

에 해당하는 위치에 할당되며, f_RA의 인덱스가 1인 PRACH #1은 수학식 1에 따라서 RB 인덱스 30에 해당하는 위치에 할당된다. f_RA의 인덱스가 2인 PRACH #2는 RB 인덱스

에 해당하는 위치에 할당되고, f_RA의 인덱스가 3인 PRACH #3은 RB 인덱스 24에 해당하는 위치에 할당된다. 그리고 f_RA의 인덱스가 4인 PRACH #4는 RB 인덱스

에 해당하는 위치에 할당되고, f_RA의 인덱스가 5인 PRACH #5는 RB 인덱스 18에 해당하는 위치에 할당된다. 이렇게 함으로써, f_RA의 인덱스에 따라 PRACH가 할당되는 RB 위치가 가운데 위치한 RB를 중심으로 서로 대칭이 된다.As shown in Fig. 8 (B), PRACH # 0 the index is 0, f _RA according to equation (1) is

RB index < RTI ID = 0.0 >

And PRACH # 1 with index f _RA of 1 is allocated to a position corresponding to RB index 30 according to Equation (1). PRACH # 2 with an index of f _RA is 2,

And PRACH # 3 with an index of f _RA of 3 is allocated to a position corresponding to the RB index 24. And PRACH # 4 with index fRA of f _RA is indexed by RB index

And PRACH # 5 with an index of f _RA of 5 is allocated to a position corresponding to the RB index 18. By doing so, the RB where the PRACH is allocated according to an index of f _RA are symmetrical to each other around the RB in the middle.

(f_RA = 0)이고, 가용한 PRACH의 최대 개수가 6이지만,

의 최대값이 2인 경우이며, 따라서 f_RA가 0, 1, 2일 때 PRACH의 배치 구조를 나타낸다. 8 (C)

( _fRA = 0) and the maximum number of usable PRACHs is 6,

Is 2, and thus the arrangement structure of the PRACH is shown when f _RA is 0, 1, and 2.

에 해당하는 위치에 할당되고, f_RA의 인덱스가 1인 PRACH #1은 RB 인덱스 6에 해당하는 위치에 할당되며, f_RA의 인덱스가 2인 PRACH #2는 RB 인덱스

에 해당하는 위치에 할당된다.As shown in (C) of Figure 8, according to the equation 1, the PRACH index # 0 in the f _RA RB index 0

PRACH # 1 with index f _RA of 1 is allocated to a position corresponding to RB index 6, and PRACH # 2 with index fRA of f _RA is allocated to a position corresponding to RB index

As shown in FIG.

Incidentally, in the case of FIG. 8 (C), RB holes with RB indices ranging from 0 to 5 are generated. As the RB hole is generated, there arises a problem that the radio resources can not be allocated continuously to the RBs located at the upper side in the data traffic transmission.

값이 하위 영역에 위치하는 경우와 상위 영역에 위치하는 경우에 있어서, 동일한 수와 동일한 수의 PRACH 구성 시 f_RA 인덱스에 따라 점유하는 RB 위치가 서로 대칭이 되지 않아 각 셀의 PRACH 구성 버전 배정 및 관리가 쉽지 않다. Also, according to Equation (1), the RB positions to which the PRACH is partially allocated are symmetrical with respect to the center of the RB located at the center,

Value is in the case which is located in the case which is located in the lower area and upper area, when PRACH configuration of the same number and the same number of the RB position occupied in accordance with f _RA index because the symmetry is not another PRACH configuration version of each of the cells assigned and Management is not easy.

인 경우에 수학식 1을 이용할 때

의 값에 따른 가용한 PRACH의 수를 나타낸 도면이다.9 shows a system channel bandwidth of 20 MHz in the LTE TDD mode,

When Equation (1) is used

And the number of available PRACHs according to the value of the PRACH.

의 값이 RB 인덱스의 하위 영역 0~49에 위치하는 경우와 상위 영역 50~99에 위치하는 경우, 가용한 PRACH의 수가 비대칭 구조를 이루며, 상위 영역에 위치할 때 PRACH의 개수가 3(f_RA = 2), 5(f_RA = 4)인 경우는 사용할 수 없는 문제가 나타난다.As shown in Fig. 9,

Is located in the lower areas 0 to 49 of the RB index and in the upper areas 50 to 99, the number of available PRACHs is asymmetric, and when the number of PRACHs is located in the upper area is 3 (f _RA = 2) and 5 (f _RA = 4).

인 경우에 수학식 1을 이용할 때

의 값에 따른 가용한 PRACH의 수를 나타낸 도면이다. FIG. 10 is a diagram illustrating a case where the system channel bandwidth is 10 MHz in the LTE TDD mode

When Equation (1) is used

And the number of available PRACHs according to the value of the PRACH.

의 값이 RB 인덱스의 하위 영역 0~24에 위치하는 경우와 상위 영역 25~49에 위치하는 경우, 가용한 PRACH의 수가 비대칭 구조를 이루며, 상위 영역에 위치할 때 PRACH 개수가 3(f_RA = 2), 5 (f_RA = 4)인 경우는 사용할 수 없는 문제가 나타난다.As shown in Fig. 10,

Is located in the lower region 0 to 24 of the RB index and in the upper region 25 to 49, the number of available PRACHs is asymmetric, and when the PRACH number is located in the upper region, the number of PRACHs is 3 (f _RA = 2) and 5 (f _RA = 4).

인 경우에 수학식 1을 이용할 때

의 값에 따른 가용한 PRACH의 수를 나타낸 도면이다. FIG. 11 is a diagram illustrating a case where the system channel bandwidth is 5 MHz in the LTE TDD mode

When Equation (1) is used

And the number of available PRACHs according to the value of the PRACH.

의 값이 RB 인덱스의 하위 영역 0~12에 위치하는 경우와 상위 영역 13~24에 위치하는 경우 가용한 PRACH의 수가 비대칭 구조를 이루며, 상위 영역에 위치할 때 PRACH 개수가 3(f_RA = 2)인 경우는 사용할 수 없는 문제가 나타난다.As shown in Fig. 11,

Is located in the lower areas 0 to 12 of the RB index and in the upper areas 13 to 24, the number of available PRACHs is asymmetric, and when the PRACH number is located in the upper area, the number of PRACHs is 3 (f _RA = 2 ), There is a problem that it can not be used.

Table 3-1 and Table 3-2 show examples of LTE TDD PRACH configuration through time and frequency domain multiplexing. The PRACH radio resource mapping for multiplexing a plurality of PRACHs in the time domain and the frequency domain and transmitting a random access preamble is organized in the markers (x, y, z, w) format using four kinds of parameters.

[Table 3-1]

[Table 3-2]

In the markers (x, y, z, w) shown in Tables 3-1 and 3-2, x represents one frequency domain parameter, and y, z and w represent time domain parameters, respectively.

를 나타낸다. 여기서

는 각각 PRACH를 위한 랜덤 접속 자원이 매 무선 프레임마다 혹은 짝수 또는 홀수 무선프레임마다 할당됨을 의미하고,

은 각각 PRACH를 위한 랜덤 접속 자원이 프레임 절반(half frame)의 첫 번째(앞부분) 또는 프레임 절반의 두 번째(뒷부분)에 위치함을 나타낸다.

는 랜덤 접속 프리앰블이 시작하는 서브프레임 인덱스를 의미하는데, 0은 하향링크와 상향링크의 전환점이 위치한 서브프레임 사이의 첫 번째 상향링크 서브프레임을 나타낸다. x represents a frequency resource index f _RA , and y, z, and w denote, respectively,

. here

Each means that a random access resource for the PRACH is allocated every radio frame or every even or odd radio frame,

Indicates that the random access resource for the PRACH is located at the first (front portion) of the half frame or at the second (rear portion) of the frame half, respectively.

Denotes a subframe index at which a random access preamble starts, and 0 denotes a first uplink subframe between subframes in which downlink and uplink switching points are located.

Uplink-downlink configurations are related to a frame structure of a TDD scheme, and show a frame structure by a configuration ratio of a downlink subframe and an uplink subframe. Table 4 shows the index of the frame structure by the configuration ratio of the DL subframe and the UL subframe, i.e., the UL-DL configuration index. Table 4 shows an example of a TDD uplink-downlink configuration. Here, D denotes a subframe in which downlink transmission is performed, U denotes a subframe in which downlink transmission is performed, S denotes a special subframe in which downlink and uplink are switched, and a downlink pilot transmission slot DwPTS A switching gap, and an uplink pilot transmission slot (UpPTS).

[Table 4]

In this manner, a PRACH is configured and a series of random access procedures are performed starting with the random access preamble transmission.

의 값이 RB 인덱스의 하위 영역에 위치하든 상위 영역에 위치하든 RB 홀이 발생하지 않도록 하는 PRACH의 주파수 도메인 자원 구성 방법에 대해서 자세하게 설명한다. Then, below

The PRACH frequency domain resource configuration method for preventing the occurrence of RB holes regardless of whether the value of the RB index is located in a lower area or an upper area is described in detail.

, f_RA 및

을 이용하여

이

에 대해 주파수 도메인의 상위 영역 혹은 하위 영역에 위치함에 따라 PRACH가 할당되는 RB 인덱스

를 다르게 결정하여 주파수 도메인에서 PRACH 다중화를 수행하는 것을 특징으로 한다. A method for constructing a frequency domain resource of a PRACH according to an embodiment of the present invention includes:

, f _RA and

Using

this

The PRACH is allocated to the upper region or the lower region of the frequency domain with respect to the RB index

And performs PRACH multiplexing in the frequency domain.

이 상위 영역으로 설정되든 하위 영역으로 설정되든 복수 개의 PRACH가 할당되는 경우, 가운데 위치한 RB를 중심으로 PRACH가 할당되는 RB가 대칭으로 위치하는 것을 특징으로 한다. A method for constructing a frequency domain resource of a PRACH according to an embodiment of the present invention includes:

If the PRACH is set to be the upper area or the lower area or a plurality of PRACHs are allocated, the RB to which the PRACH is allocated centered on the centered RB is symmetrically located.

를 결정하는 방법을 특징으로 하며,

를 결정하는 방법은 수학식 2에 의해 결정된다. The PRACH frequency domain resource configuration method according to an exemplary embodiment of the present invention may further include the steps of:

The method comprising the steps of:

Lt; RTI ID = 0.0 > (2) < / RTI >

는 각 랜덤 접속 프리앰블 즉, 하나의 PRACH가 점유하는 RB의 수를 나타내며, 가령 LTE에서

는 6이 된다. 따라서 PRACH 전송을 위해 상위 계층에서 알려주는 RB의 인덱스인 PRACH 주파수 옵셋

은

범위 내에서 설정된다.

는 가용한 상향링크 채널 주파수 대역 범위 내에서

값이 상위 영역에 위치하는지 혹은 하위 영역에 위치하는지를 나타내는 지시값을 나타내며, 수학식 3에 따라 결정된다. In Equation (2), floor (x) returns the largest integer among integers less than or equal to the parameter x. f _RA denotes a PRACH frequency resource index divided through frequency domain multiplexing. The frequency resource index of the PRACH starts from zero within the maximum number of available PRACHs in the cell.

Represents the number of random access preambles, i.e., the number of RBs occupied by one PRACH. For example, in LTE

Becomes 6. Therefore, the PRACH frequency offset, which is the index of the RB informed by the upper layer for PRACH transmission,

silver

. ≪ / RTI >

Within the range of the available uplink channel frequency band

Represents an indication value indicating whether the value is located in an upper area or a lower area, and is determined according to equation (3).

을 만족하면

값이 가용한 상향링크 채널 주파수 대역 범위 내에서 상위 영역에 위치하는 것을 나타내고,

이 된다.

이면

값이 상향링크 채널 주파수 대역 범위 내에서 하위 영역에 위치하는 것을 나타내고,

이 된다.In other words

Is satisfied

Value is located in an upper region within an available uplink channel frequency band range,

.

If

Value is located in the sub-region within the range of the uplink channel frequency band,

.

값이 상향링크 채널 주파수 대역 범위 내에서 하위 영역에 위치하는 경우 수학식 2에 따라 상향링크 서브프레임에 PRACH을 할당하는 일 예를 나타낸 도면이다. FIG. 12 is a flowchart illustrating an operation of the mobile station in the LTE TDD mode according to the embodiment of the present invention.

Value is located in a sub-region within an uplink channel frequency band range, a PRACH is allocated to an uplink subframe according to Equation (2).

(f_RA = 0)이고, 가용한 PRACH의 최대 개수가 6인 경우를 나타내며, 따라서 f_RA가 0, 1, 2, 3, 4, 5일 때 PRACH의 배치 구조를 나타낸다. 12 (A) shows an offset value for specifying the position of the first PRACH

(f _RA = 0) and the maximum number of usable PRACHs is 6. Therefore, we show the arrangement structure of PRACH when f _RA is 0, 1, 2, 3, 4,

에 해당하는 주파수 영역에서 RB 인덱스 0에 해당하는 최하위에 할당되고 f_RA의 인덱스가 1인 PRACH #1은 RB 인덱스

에 해당하는 최상위에 할당된다. f_RA의 인덱스가 2인 PRACH #2는 RB 인덱스 6에 해당하는 위치에 할당되고, f_RA의 인덱스가 3인 PRACH #3은 RB 인덱스

에 해당하는 위치에 할당된다. 그리고 f_RA의 인덱스가 4인 PRACH #4는 RB 인덱스 12에 해당하는 위치에 할당되고, f_RA의 인덱스가 5인 PRACH #5는 RB 인덱스

에 해당하는 위치에 할당된다. 이렇게 함으로써, f_RA의 인덱스에 따라 PRACH가 할당되는 RB 위치가 가운데 위치한 RB를 중심으로 서로 대칭이 된다.As shown in Fig. 12 (A), PRACH # 0 the index is 0, f _RA according to equation (2) is

Assigned to the least significant for the RB index 0 in the frequency domain to be the index of the PRACH f _RA # 1 is 1 RB index

Quot; is assigned to the highest level. is the index of the PRACH f _RA 2 # 2 is allocated to a position corresponding to 6 RB index, a PRACH # 3, the index of f _RA is 3 RB index

As shown in FIG. And a PRACH # 4, the index of f _RA 4 are assigned to the position corresponding to the RB index 12, a PRACH # 5, the index of f _RA 5 are RB index

As shown in FIG. By doing so, the RB where the PRACH is allocated according to an index of f _RA are symmetrical to each other around the RB in the middle.

(f_RA = 0)이고, 가용한 PRACH의 최대 개수가 6인 경우이며, 따라서 f_RA가 0, 1, 2, 3, 4, 5일 때 PRACH의 배치 구조를 나타낸다. Figure 12 (B)

(f _RA = 0), and the maximum number of usable PRACHs is 6. Therefore, the arrangement structure of PRACH is shown when f _RA is 0, 1, 2, 3, 4,

에 해당하는 주파수 영역에서 RB 인덱스 18에 해당하는 위치에 할당되고 f_RA의 인덱스가 1인 PRACH #1은 RB 인덱스

에 해당하는 위치에 할당된다. f_RA의 인덱스가 2인 PRACH #2는 RB 인덱스 24에 해당하는 위치에 할당되고, f_RA의 인덱스가 3인 PRACH #3은 RB 인덱스

에 해당하는 위치에 할당된다. 그리고 f_RA의 인덱스가 4인 PRACH #4는 RB 인덱스 30에 해당하는 위치에 할당되고, f_RA의 인덱스가 5인 PRACH #5는 RB 인덱스

에 해당하는 위치에 할당된다. 이렇게 함으로써, f_RA의 인덱스에 따라 PRACH가 할당되는 RB 위치가 가운데 위치한 RB를 중심으로 서로 대칭이 된다.As shown in FIG. 12 (B), according to Equation (2), PRACH # 0 with an index of f _RA is 0

Assigned to the position corresponding to the RB index in the frequency domain 18, which is the index of the PRACH f _RA # 1 is 1 RB index

As shown in FIG. is the index of the PRACH f _RA 2 # 2 is assigned to the position corresponding to the RB index 24, a PRACH # 3, the index of f _RA is 3 RB index

As shown in FIG. And a PRACH # 4, the index of f _RA 4 are assigned to the position corresponding to the RB index 30, a PRACH # 5, the index of f _RA 5 are RB index

As shown in FIG. By doing so, the RB where the PRACH is allocated according to an index of f _RA are symmetrical to each other around the RB in the middle.

(f_RA = 0)이고, 가용한 PRACH의 최대 개수가 6이지만,

의 최대값이 2인 경우를 나타내며, 따라서 f_RA가 0, 1, 2일 때 PRACH의 배치 구조를 나타낸다. Figure 12 (C)

( _fRA = 0) and the maximum number of usable PRACHs is 6,

Is 2, and thus the arrangement structure of the PRACH is shown when f _RA is 0, 1, and 2.

는 0이 되므로, f_RA의 인덱스가 0인 PRACH #0은

에 해당하는 주파수 영역에서 RB 인덱스 0에 해당하는 최하위에 할당된다. 그리고 수학식 2에 따라서 f_RA의 인덱스가 1인 PRACH #1은 RB 인덱스

에 해당하는 최상위에 할당되며, f_RA의 인덱스가 2인 PRACH #2는 RB 인덱스 6에 해당되는 위치에 할당된다. According to Equation (2), the first PRACH

0 ", PRACH # 0 with an index of f _RA is 0

Is assigned to the lowest rank corresponding to the RB index 0 in the frequency domain corresponding to the RB index. According to Equation (2), PRACH # 1 in which the index of f _RA is 1 is the RB index

Assigned to the top-level corresponding to, a PRACH # 2, the index of f _RA 2 is allocated to a position corresponding to the RB index 6.

값이 상향링크 채널 주파수 대역 범위 내에서 상위 영역에 위치하는 경우 수학식 2에 따라 상향링크 서브프레임에 PRACH를 할당하는 일 예를 나타낸 도면이다. FIG. 13 is a block diagram illustrating an exemplary embodiment of the present invention in an LTE TDD mode

Value is located in an upper region within an uplink channel frequency band range, PRACH is allocated to an uplink subframe according to Equation (2).

(f_RA = 0)이고, 가용한 PRACH의 최대 개수가 6인 경우이며, 따라서 f_RA가 0, 1, 2, 3, 4, 5일 때 PRACH의 배치 구조를 나타낸다. 13 (A) shows an offset value designating the position of the first PRACH

(f _RA = 0), and the maximum number of usable PRACHs is 6. Therefore, the arrangement structure of PRACH is shown when f _RA is 0, 1, 2, 3, 4,

에 해당하는 주파수 영역에서 RB 인덱스

에 해당하는 최상위에 할당되고 f_RA의 인덱스가 1인 PRACH #1은 RB 인덱스 0에 해당하는 최하위에 할당된다. f_RA의 인덱스가 2인 PRACH #2는 RB 인덱스

에 해당하는 위치에 할당되고, f_RA의 인덱스가 3인 PRACH #3은 RB 인덱스 6에 해당하는 위치에 할당된다. 그리고 f_RA의 인덱스가 4인 PRACH #4는 RB 인덱스

에 해당하는 최상위에 할당되고, f_RA의 인덱스가 5인 PRACH #5는 RB 인덱스 12에 해당하는 위치에 할당된다. 이렇게 함으로써, f_RA의 인덱스에 따라 PRACH가 할당되는 RB 위치가 가운데 위치한 RB를 중심으로 서로 대칭이 된다. As shown in Fig. 13 (A), PRACH # 0 the index is 0, f _RA according to equation (2) is

RB index < RTI ID = 0.0 >

Assigned to the top and is corresponding to the index of the PRACH f _RA 1 # 1 is allocated to least significant for the RB index 0. PRACH # 2 with an index of f _RA is 2,

Is assigned to a position corresponding to, the index of the PRACH f _RA 3 # 3 is allocated to a position corresponding to the RB index 6. And PRACH # 4 with index fRA of f _RA is indexed by RB index

And PRACH # 5 with an index of f _RA of 5 is allocated to a position corresponding to the RB index 12. By doing so, the RB where the PRACH is allocated according to an index of f _RA are symmetrical to each other around the RB in the middle.

(f_RA = 0)이고, 가용한 PRACH의 최대 개수가 6인 경우이며, 따라서 f_RA가 0, 1, 2, 3, 4, 5일 때 PRACH의 배치 구조를 나타낸다. 13 (B)

(f _RA = 0), and the maximum number of usable PRACHs is 6. Therefore, the arrangement structure of PRACH is shown when f _RA is 0, 1, 2, 3, 4,

에 해당하는 주파수 영역에서 RB 인덱스

에 해당하는 위치에 할당되며, f_RA의 인덱스가 1인 PRACH #1은 수학식 1에 따라서 RB 인덱스 18에 해당하는 위치에 할당된다. f_RA의 인덱스가 2인 PRACH #2는 RB 인덱스

에 해당하는 위치에 할당되고, f_RA의 인덱스가 3인 PRACH #3은 RB 인덱스 24에 해당하는 위치에 할당된다. 그리고 f_RA의 인덱스가 4인 PRACH #4는 RB 인덱스

에 해당하는 위치에 할당되고, f_RA의 인덱스가 5인 PRACH #5는 RB 인덱스 30에 해당하는 위치에 할당된다. 이렇게 함으로써, f_RA의 인덱스에 따라 PRACH의 RB 위치가 가운데 위치한 RB 중심으로 서로 대칭이 된다.As shown in Fig. 13 (B), PRACH # 0 the index is 0, f _RA according to equation (2) is

RB index < RTI ID = 0.0 >

Is assigned to the position corresponding to, PRACH # 1 is the index of f _RA 1 is allocated to a position corresponding to the RB index 18 according to the equation (1). PRACH # 2 with an index of f _RA is 2,

And PRACH # 3 with an index of f _RA of 3 is allocated to a position corresponding to the RB index 24. And PRACH # 4 with index fRA of f _RA is indexed by RB index

And PRACH # 5 with an index of f _RA of 5 is allocated to a position corresponding to the RB index 30. By doing so, the RACH positions of the PRACH are symmetrical with respect to the centers of the RBs located at the center according to the index of f _RA .

(f_RA = 0)이고, 가용한 PRACH의 최대 개수가 6이지만,

의 최대값이 2인 경우이며, 따라서 f_RA가 0, 1, 2일 때 PRACH의 배치 구조를 나타낸다. 13 (C)

( _fRA = 0) and the maximum number of usable PRACHs is 6,

Is 2, and thus the arrangement structure of the PRACH is shown when f _RA is 0, 1, and 2.

에 해당하는 최상위에 할당되고, f_RA의 인덱스가 1인 PRACH #1은 RB 인덱스 0에 해당하는 최하위에 할당되며, f_RA의 인덱스가 2인 PRACH #2는 RB 인덱스

에 해당하는 위치에 할당된다.As shown in (C) of Figure 13, according to the equation 2, PRACH # 0 of the index f _RA in the RB index 0

Is assigned to the top-level corresponding to, PRACH # 1 is the index of f _RA is 1 RB are allocated to the lowest corresponding to index 0, the index of the PRACH f _RA 2 # 2 is RB index

As shown in FIG.

13C, the maximum number of usable PRACHs is 6. However, even if only three PRACHs are allocated, RB holes are not generated unlike FIG. 8C.

As described above, according to the PRACH frequency domain resource configuration method of the present invention based on Equation (2), RB holes are not generated, and therefore, RBs can be continuously allocated in the data traffic transmission, Thereby enabling efficient operation of radio resources.

값이 하위 영역에 위치하는 경우와 상위 영역에 위치하는 경우에 있어서, 동일한 수의 PRACH 구성 시 f_RA 인덱스에 따라 점유하는 RB 위치가 서로 대칭을 이루게 되어 각 셀의 PRACH 구성 버전 배정 및 관리가 용이하다. Further, if the frequency domain resource of the PRACH is configured based on Equation (2)

Values are located in the lower region and the upper region, the RACH positions occupied according to the _fRA index are symmetrical with each other in the same number of PRACH configurations, so that the PRACH configuration version of each cell can be easily allocated and managed Do.

의 값에 따른 가용한 PRACH의 수를 나타낸 도면으로, 시스템 채널 대역은 20MHz이고,

인 경우를 도시하였다. 14 is a diagram illustrating a method of constructing a frequency domain resource of a PRACH according to an embodiment of the present invention. In Equation (2), in an LTE TDD mode

The number of available PRACHs according to the value of the system channel bandwidth is 20 MHz,

.

의 값이 RB 인덱스의 하위 영역 0~49에 위치하는 경우와 상위 영역 50~99에 위치하는 경우, 가용한 PRACH의 수가 완전한 대칭 구조를 이루며, 도 9와 달리

이 상위 영역에 위치할 때에도 PRACH의 개수가 3(f_RA = 2), 5(f_RA = 4)인 경우도 사용할 수 있다.As shown in Fig. 14,

Is located in the lower areas 0 to 49 of the RB index and in the upper areas 50 to 99, the number of usable PRACHs has a completely symmetrical structure,

(F _RA = 2) and 5 (f _RA = 4) can be used even when the PRACH is located in the upper area.

의 값에 따른 가용한 PRACH의 수를 나타낸 도면으로, 시스템 채널 대역은 10MHz이고,

인 경우를 도시하였다. 15 is a method for constructing a frequency domain resource of a PRACH according to an embodiment of the present invention. In case of using Equation 2, in the LTE TDD mode

The number of available PRACHs according to the value of the system channel bandwidth is 10 MHz,

.

의 값이 RB 인덱스의 하위 영역 0~24에 위치하는 경우와 상위 영역 25~49에 위치하는 경우, 가용한 PRACH의 수가 완전한 대칭 구조를 이루며, 도 10과 달리

이 상위 영역에 위치할 때에도 PRACH의 개수가 3(f_RA = 2), 5(f_RA = 4)인 경우도 사용할 수 있다.As shown in Fig. 15,

Is located in the lower regions 0 to 24 of the RB index and in the upper regions 25 to 49, the number of available PRACHs has a completely symmetrical structure, and unlike FIG. 10

(F _RA = 2) and 5 (f _RA = 4) can be used even when the PRACH is located in the upper area.

의 값에 따른 가용한 PRACH의 수를 나타낸 도면으로, 시스템 채널 대역은 5MHz이고,

인 경우를 도시하였다. 16 is a method for constructing a frequency domain resource of a PRACH according to an embodiment of the present invention. In case of using Equation (2), in the LTE TDD mode

The number of available PRACHs according to the value of the system channel bandwidth is 5 MHz,

.

의 값이 RB 인덱스의 하위 영역 0~12에 위치하는 경우와 상위 영역 13~24에 위치하는 경우, 가용한 PRACH의 수가 완전한 대칭 구조를 이루며, 도 11과 달리

이 상위 영역에 위치할 때에도 PRACH의 개수가 3(f_RA = 2)인 경우도 사용할 수 있다. As shown in Fig. 16,

Is located in the lower areas 0 to 12 of the RB index and in the upper areas 13 to 24, the number of available PRACHs has a completely symmetrical structure,

And the number of PRACHs is 3 (f _RA = 2) even when it is located in the upper area.

Also, in the frequency domain resource configuration method according to the embodiment of the present invention, PRACH can be reconstructed by applying time and frequency domain multiplexing to different PRACH configuration versions. Time and frequency domain multiplexing can use four kinds of parameters (x, y, z, w) as shown in Table 3. In this way, when different cells have the same number of random access channels and have the same TDD frame structure, inter-cell random access channel interference with different PRACH configuration versions can be avoided.

By using the frequency domain resource configuration method described above, a system applying a more effective random access procedure can be constructed.

을 하위 영역 혹은 상위 영역에 위치하도록 하고, 도 6과 같이 셀간에 버전을 달리하면서 PRACH를 배치하고, 표 4 와 같이 시간 및 주파수 도메인 다중화를 통한 PRACH를 구성함으로써, 랜덤 접속 프리앰블 전송 시 발생할 수 있는 PRACH의 간섭을 효과적으로 줄일 수 있고, 랜덤 접속 성공 확률을 높일 수 있으며, PRACH의 처리 부하를 여러 셀에 걸쳐 골고루 분산시킬 수 있는 효과를 얻을 수 있다.12 and 13,

As shown in FIG. 6, PRACHs are arranged with different versions between cells as shown in FIG. 6, and PRACH is configured through time and frequency domain multiplexing as shown in Table 4, so that random access preamble The PRACH interference can be effectively reduced, the random access success probability can be increased, and the processing load of the PRACH can be evenly distributed over a plurality of cells.

FIG. 17 is a diagram illustrating a random access channel resource configuration apparatus according to an embodiment of the present invention.

17, the random access channel resource configuration apparatus 1700 includes a processor 1710, a transceiver 1720, and a memory 1730. The random access channel resource configuration device 1700 may be implemented in a base station.

The processor 1710 determines the value of the RB index to which the PRACH is allocated so that the RB of the PRACH that is the random access channel in the available uplink RB has a symmetric structure through Equation 2, . The processor 1710 performs time domain and frequency domain multiplexing with different PRACH configuration versions to avoid inter-cell PRACH interference when different cells have the same number of PRACHs and have the same TDD frame structure to reconstruct the PRACH can do.

The transceiver 1720 transmits / receives data or signals to / from the terminal. In particular, the transceiver 1720 transmits the resource configuration information of the PRACH to all terminals located in the cell.

The memory 1730 stores instructions for frequency domain resource configuration of the PRACH in the processor 1710 or temporarily stores the instructions from a storage device (not shown), and the processor 1710 temporarily stores the instructions in the memory 1730 ) And executes the stored or loaded instructions.

The processor 1710 and the memory 1730 are connected to each other via a bus (not shown), and an input / output interface (not shown) may be connected to the bus. At this time, a transceiver 1720 is connected to the input / output interface, and peripheral devices such as an input device, a display, a speaker, and a storage device may be connected.

The embodiments of the present invention are not limited to the above-described apparatuses and / or methods, but may be implemented by a program for realizing functions corresponding to the configuration of the embodiment of the present invention or a recording medium on which the program is recorded. The embodiments can be easily implemented by those skilled in the art from the description of the embodiments described above.

While the present invention has been particularly shown and described with reference to exemplary embodiments thereof, it is to be understood that the invention is not limited to the disclosed exemplary embodiments, It belongs to the scope of right.

Claims (15)

A method for constructing a frequency domain resource of a random access channel of a wireless communication system,
A position of an offset value designating a position of a first random access channel among a plurality of random access channels, and wherein the offset value is located in an upper region based on a center radio resource block in an available uplink radio resource block, Determining an indication value having a different value depending on whether or not the indication value is located at a first position,
The plurality of random access channels are allocated using the offset value, the indication value, and the frequency resource index of each random access channel so that the radio resource blocks of the plurality of random access channels are symmetric with respect to the center radio resource block Determining an index of a radio resource block, and
And allocating the plurality of random access channels to a position corresponding to an index of a determined radio resource block,
When a position of an offset value designating a position of a first random access channel among the plurality of random access channels is in an upper region of an index of the available uplink radio resource block, the distribution of the number of the random access channels is Symmetric with the distribution of the number of random access channels when the position of the offset value is in a sub-region of the index,
Calculating an index of a radio resource block to which each random access channel is allocated,
The equation

Lt;
Wherein floor (x) returns the largest integer among integers less than or equal to the parameter x, fRA represents the frequency resource index of each random access channel,

Represents the number of radio resource blocks occupied by one random access channel,

Is the offset value,

Is the above instruction value,

Wherein the random access channel is an index of a radio resource block to which the random access channel is allocated. delete delete The method of claim 1,
Wherein the indication value has a value of 1 or -1 according to the position of the offset value. delete 5. The method of claim 4,
The indication value is 1 when the offset value is located in the upper region based on the middle radio resource block in the available uplink radio resource block, and the offset value is 1 when the position is located in the upper Gt; -1 < / RTI > when located in a sub-region. The method of claim 1,
Wherein the determining further comprises receiving the offset value from an upper layer. The method of claim 1,
Allocating the positions of the plurality of random access channels differently from the neighboring cells in the time domain when the same number of random access channels as the neighboring cells are constituted and have the same frame structure
Further comprising the steps of: An apparatus for configuring a frequency domain resource of a random access channel in a wireless communication system,
A position of an offset value designating a position of a first random access channel among a plurality of random access channels, and wherein the offset value is located in an upper area based on a middle radio resource block in the available uplink radio resource block, Determining whether the radio resource block of the random access channel is symmetric with respect to the radio resource block based on the center radio resource block, A processor for determining a radio resource block to which the plurality of random access channels are allocated using a frequency resource index of a channel,
A transceiver for transmitting resource configuration information of the plurality of random access channels to a terminal in a cell
/ RTI >
Wherein the processor determines an index of a radio resource block to which each random access channel is allocated using an equation,
The equation

Lt;
The floor (x) returns the largest integer among integers smaller than or equal to the parameter x, the fRA indicates a frequency resource index of the random access channel,

Represents the number of radio resource blocks occupied by one random access channel,

Is the offset value,

Is the above instruction value,

Wherein the random access channel is an index of a radio resource block to which the random access channel is allocated. delete The method of claim 9,
The indication value may be a random access channel having a value of 1 or -1 depending on whether the offset value is located in an upper area or a lower area based on the middle radio resource block in the available uplink radio resource block Resource configuring device. delete 12. The method of claim 11,
The indication value is 1 when the offset value is located in the upper region based on the middle radio resource block in the available uplink radio resource block, and the offset value is 1 when the position is located in the upper And a value of -1 in case of being located in a sub-region. The method of claim 9,
Wherein the processor configures a random access channel having the same number of neighboring cells and has the same frame structure, a random access channel resource configuration unit for allocating the positions of the plurality of random access channels differently from the neighboring cells in a time domain, . The method of claim 14,
The location of the plurality of random access channels in the time domain includes a first marker, a second marker, and a third marker,
Wherein the first marker represents one of a radio frame, an even radio frame and an odd radio frame, the second indicator represents a front part of a half frame or a rear part of a half of the frame, And the indicator indicates a subframe index at which the random access preamble starts.

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