WO2016011667A1 - Method and device for transmitting random access preamble - Google Patents

Abstract

Provided are a method and device for transmitting a random access preamble, which relate to the field of communications, and improve a resource utilization rate of a random access channel. The method comprises: receiving preamble configuration information and resource configuration information sent by a network side device, frequency bandwidths of resources which are indicated by the resource configuration information and can be used for transmitting a random access preamble being at least N_RB ^RACH physical resource blocks, wherein N_RB ^RACH is an integer, and 1≤N_RB ^RACH ≤3; generating the random access preamble according to the preamble configuration information; and determining the resources used for transmitting the random access preamble according to the resource configuration information, and using the resources to transmit the random access preamble, frequency bandwidths of the resources used for transmitting the random access preamble being N_RB ^RACH physical resource blocks, wherein the N_RB ^RACH physical resource blocks contain N_SC ^RACH sub-carriers, and N_SC ^RACH = (180000 / Δf _RA) × N_RB ^RACH and is an integer, where Δf _RA is a sub-carrier interval of the random access preamble, and 312.5 Hz≤Δf _RA≤625 Hz. The embodiments of the present invention are used for transmitting a random access preamble.

Description

 Method and device for transmitting random access preamble

 The present invention relates to the field of communications, and in particular, to a method and a device for transmitting a random access preamble.

Background technique

 In the communication system, the base station first establishes downlink synchronization with the user equipment before establishing a communication connection with the user equipment, so that the user equipment initiates random access to the base station, where the base station determines to receive according to the random access preamble sent by the user equipment. Power and time, then the base station sends a random access response to the user equipment, indicating the power and time of the next transmission of the user equipment, so as to establish uplink synchronization, and only the downlink synchronization and uplink synchronization are obtained, and the communication connection can be established between the user equipment and the base station. .

 The random access preamble in the prior art is composed of a preamble sequence and a cyclic prefix. The length of the preamble sequence is 839, which is mapped to 839 subcarriers, the subcarrier spacing is 1.25 3⁄4, and there are 12/13 subcarriers on each side. The guard band of the carrier width occupies a total of 864 subcarrier frequency bandwidths. At present, the frequency bandwidth occupied by the preamble sequence of the random access preamble is 1.25 KHz" S64^1 .0 SMHz. Therefore, the spectrum resource used for transmitting the random access preamble is at least 6 physical resource blocks, one physical resource. The frequency bandwidth of the block is 1 80. In addition, for the user equipment in a place with less obstruction, the above random access preamble can achieve good random access effect.

However, for some M2M (Machine to Machine Communication) terminals in deep basement or mountainous areas, the M2M terminal transmits the random access preamble due to the occlusion and transmission distance of the obstruction. The transmission loss and the signal attenuation are increased. Thus, the coverage capability of the existing random access preamble is insufficient to enable the M2M terminal to complete random access, and the coverage refers to the range of distances that the random access preamble can be transmitted. In order to support M2M communication, it is necessary to consider the coverage enhancement of random access. Repeated random access preambles may be considered in the prior art, but such repetition may result in excessive resource overhead. For example, to achieve a 20 dB coverage enhancement, it may be necessary to repeat 200 random access preambles, which is almost unacceptable in implementation. Summary of the invention

 The embodiments of the present invention provide a method and a device for transmitting a random access preamble to solve the problem that the resource overhead is too high when considering the coverage enhancement of random access in the prior art.

 In order to achieve the above object, the embodiment of the present invention adopts the following technical solutions:

 The first aspect provides a user equipment, where the user equipment includes:

 a receiving unit, configured to receive preamble configuration information and resource configuration information sent by the network side device, where the preamble configuration information indicates a parameter used to generate a random access preamble, where the resource configuration information indication can be used to transmit a random access preamble The frequency bandwidth of the resource that can be used to transmit the random access preamble is at least one physical resource block, d number, and 1≤Λ^^≤3;

 a processing unit, configured to generate a random access preamble according to the preamble configuration information received by the receiving unit;

 Determining, according to the resource configuration information received by the receiving unit, a resource used for transmitting the random access preamble;

 a sending unit, configured to transmit the random access preamble by using the resource;

The frequency bandwidth of the resource used for transmitting the random access preamble is N^ ^H physical resource blocks, and the N^ ^OT physical resource blocks include Λ3⁄4^ subcarriers, _Ν Η ,

N^ ^CH is an integer, Δ/^ is the subcarrier spacing of the random access preamble, and 312.5 _3⁄4 ≤ Δ _ΚΑ ≤ 625 Hz.

In a first possible implementation manner of the first aspect, the parameter used by the preamble configuration information to generate a random access preamble includes a preamble format index, where the preamble format index corresponds to a set of preamble formats, the group The preamble format includes at least two preamble formats, wherein each preamble format indicates a time domain duration T _SEQ of the preamble sequence in the random access preamble, and a time domain duration 丄τ CP of the cyclic prefix.

 The processing unit generates a random access preamble according to the preamble configuration information received by the receiving unit, and includes:

Determining a first preamble format in the set of preamble formats, and generating a random access preamble that conforms to the first preamble format; wherein, the first preamble format indication 7^ satisfies the following conditions: W is a positive integer.

In a second possible implementation manner of the first aspect, the parameter used by the preamble configuration information to generate a random access preamble includes a set of preamble format indexes, where the set of preamble format indexes corresponds to a set of preamble formats, The set of preamble format indexes includes at least two preamble format indexes, and each preamble format index corresponds to one preamble format, and each preamble format indicates a time domain duration T _SEQ of the preamble sequence in the random access preamble, And the time domain duration T _{CP of the} cyclic prefix;

 The processing unit generates a random access preamble according to the preamble configuration information received by the receiving unit, and includes:

 Determining a first preamble format in the set of preamble formats, and generating a random access preamble that conforms to the first preamble format; wherein, the first preamble format indicates that the following condition is met: Td N is a positive integer. In conjunction with the first or second possible implementation of the first aspect, in a third possible implementation, when the user equipment determines that the random access fails, the processing unit is further configured to:

 Determining a second preamble format in the set of preamble formats, and generating a second random access preamble that conforms to the second preamble format; wherein the second preamble format indicates that 7 meets the following conditions:

T = , M is an integer greater than N; determining, according to the resource configuration information, a resource for transmitting the second random access preamble; the sending unit is further configured to: use the resource to transmit the second random Access the preamble.

 With reference to any one of the first to third possible implementations of the first aspect, in a fourth possible implementation, the processing unit is further configured to: in the set of preamble formats Before determining the first preamble format, and/or before determining the second preamble format in the set of preamble formats,

 Determining channel quality information between the user equipment and the network side device;

 The processing unit determines a first preamble format in the set of preamble formats, and/or, the determining the second preamble format in the set of preamble formats, including:

Determining a first preamble format according to channel quality information between the user equipment and the network side device; and / or,

Determining a second preamble format according to channel quality information between the user equipment and the network side device. With reference to any one of the possible implementations of the first aspect to the fourth possible implementation of the first aspect, in a fifth possible implementation, the preamble configuration information is used to generate a random access preamble The parameter includes a root sequence index, where the value of the root sequence index is: a maximum prime number, where

 The processing unit generates a random access preamble according to the preamble configuration information received by the receiving unit, and includes:

And generating, according to the root sequence index, a root ZC sequence, where the sequence length of the root ZC sequence is N _zc ; and generating a random access preamble according to the root ZC sequence.

 With reference to the possible implementation of any of the first aspect to the fifth possible implementation of the first aspect, in a sixth possible implementation,

N^ ^CH = 1; ^ = 500 3⁄4, Af _RA ^ 600 Hz, or Δ/ _ΚΑ = 625/ &.

 With reference to the sixth possible implementation of the first aspect, in a seventh possible implementation, the resource configuration information is one or more physical resource block indexes, where each physical resource block index indicates one physical resource Piece. The second aspect provides a network side device, where the network side device includes:

a sending unit, configured to send, to the user equipment, pre-configuration configuration information and resource configuration information, where the pre-configuration configuration information indicates a parameter used to generate a random access preamble, where the resource configuration information indicates a resource that can be used to transmit a random access preamble; wherein the random access preamble can be used to transmit a frequency bandwidth of at least one physical resource blocks ^, N ^ ^OT is an integer and 1≤ ^CH ≤3;

Receiving means for receiving said user equipment on the ^Ν Η physical resource blocks in the frequency bandwidth of the transmission resource random access preamble;

Wherein, the physical resource blocks ^Ν Η ^CH subcarriers comprising,

_N KACH _^^_ _N MCH ^ _N ^fH is an integer, which is between the subcarriers of the random access preamble

A RA Separated, and 312.5Hz < Af^ ≤ 625 Hz.

In a first possible implementation manner of the second aspect, the parameter that is used by the preamble configuration information to generate a random access preamble includes a preamble format index, where the preamble format index corresponds to a set of preamble formats, where the group The preamble format includes at least two preamble formats, wherein each preamble format indicates a time domain duration T _sm of the preamble sequence in the random access preamble, and a time domain duration of the cyclic prefix

The random access preamble conforms to a first preamble format, and the first preamble format indicates

7^. The following conditions are met: T _SE0 , N is a positive integer.

In a second possible implementation manner of the second aspect, the parameter used by the preamble configuration information to generate a random access preamble includes a set of preamble format indexes, where the set of preamble format indexes corresponds to a set of preamble formats, The set of preamble format indexes includes at least two preamble format indexes, and each preamble format index corresponds to one preamble format, and each preamble format indicates a time domain duration T _SEQ of the preamble sequence in the random access preamble, And the time domain duration T _{CP of the} cyclic prefix;

 The random access preamble conforms to a first preamble format, and the first preamble format indicates

7^. The following conditions are met: T _SE0 , N is a positive integer.

 With reference to any one of the possible implementations of the second aspect to the second possible implementation of the second aspect, in a third possible implementation manner, the preamble configuration information is used to generate a random access preamble The parameter includes a root sequence index, where the value of the root sequence index is:

[0, N _zc - 2] , N _ze is the largest prime number less than or equal to, wherein

/ _G ≥30.

With reference to any one of the possible implementations of the second aspect to the third possible implementation of the second aspect, in a fourth possible implementation, ^CH = Af _RA ^ 500 Hz, Af _RA ^ 600 Hz, or Δ / _ΚΑ = 625 &.

With reference to the fourth possible implementation of the second aspect, in a fifth possible implementation, the resource configuration information is one or more physical resource block indexes, where each physical resource block index indicates one physical resource Piece. A third aspect provides a method for transmitting a random access preamble, where the random access preamble includes a preamble sequence and a cyclic prefix, and the user equipment transmits the random access preamble to initiate random access, where the method includes:

Receiving, by the network side device, preamble configuration information and resource configuration information, where the preamble configuration information indicates a parameter used to generate a random access preamble, where the resource configuration information indicates a resource that can be used to transmit a random access preamble; The frequency bandwidth of the resource that can be used to transmit the random access preamble is at least ^ physical resource blocks, ^ is an integer, and 1 ≤ ^CH ≤ 3;

 Generating a random access preamble according to the preamble configuration information;

 Determining, according to the resource configuration information, a resource used for transmitting the random access preamble, and using the resource to transmit the random access preamble;

Wherein the means for transmitting the random access preamble frequency bandwidth of N ^ ^OT physical resource blocks, the ^Ν Η physical resource blocks comprises N ^CH subcarriers,

_N RACH ^ is an integer, and Δ / _ΚΑ is between the subcarriers of the random access preamble

Separated, and 312.5Hz ≤ Af^ ≤ 625 Hz.

In a first possible implementation manner of the third aspect, the parameter that is used by the preamble configuration information to generate a random access preamble includes a preamble format index, where the preamble format index corresponds to a set of preamble formats, where the group The preamble format includes at least two preamble formats, wherein each preamble format indicates a time domain duration T _SEQ of the preamble sequence in the random access preamble, and a time domain duration T ¹ CP of the cyclic prefix:

 Generating a random access preamble according to the preamble configuration information, including:

Determining a first preamble format in the set of preamble formats, and generating a random access preamble that conforms to the first preamble format; where the first preamble format indicates that the following condition is met: Td N is a positive integer. In a second possible implementation manner of the third aspect, the parameter used by the preamble configuration information to generate a random access preamble includes a set of preamble format indexes, where the set of preamble format indexes corresponds to a set of preamble formats, The set of preamble format indexes includes at least two preamble format indexes, and Each preamble format index corresponds to a preamble format, each preamble format indicating a time domain duration T _SEQ of the preamble sequence in the random access preamble, and a time domain duration T _{cp of the} cyclic prefix;

 Generating a random access preamble according to the preamble configuration information, including:

 The first preamble format is determined in the set of preamble formats, and a random access preamble corresponding to the first preamble format is generated. The first preamble format indicates that 7 satisfies the following condition: Td N is a positive integer. With the first or second possible implementation of the third aspect, in a third possible implementation manner, when the user equipment determines that the random access fails, the method further includes:

 Determining a second preamble format in the set of preamble formats, and generating a second random access preamble that conforms to the second preamble format; wherein the second preamble format indicates that 7 meets the following conditions:

T M is an integer greater than N;

 And determining, according to the resource configuration information, a resource used for transmitting the second random access preamble, and transmitting, by using the resource, the second random access preamble.

 With reference to any one of the first to third possible implementation manners of the third aspect, in a fourth possible implementation, before determining the first preamble format in the set of preamble formats, And/or, before determining the second preamble format in the set of preamble formats, the method further includes: determining channel quality information between the user equipment and the network side device;

 Determining the first preamble format in the set of preamble formats, and/or determining the second preamble format in the set of preamble formats, including:

 Determining a first preamble format according to channel quality information between the user equipment and the network side device; and/or,

 Determining a second preamble format according to channel quality information between the user equipment and the network side device. With reference to any one of the first to the fourth possible implementation manners of the third aspect, in a fifth possible implementation manner, the preamble configuration information is used to generate a random access preamble The parameter includes a root sequence index, where the value of the root sequence index is:

[0, N _zc - 2] , N _ze is the largest prime number less than or equal to i^^ _x N^ "-, where

A RA A RA f _GI >30KHz;

 Generating a random access preamble according to the preamble configuration information, including:

And generating, according to the root sequence index, a root ZC sequence, where the sequence length of the root ZC sequence is N _zc ; and generating a random access preamble according to the root ZC sequence.

In conjunction with any of the possible implementations of the first to fifth possible implementations of the third aspect, in a sixth possible implementation, N ^CH =\', Δ _Α =500 3⁄4, ^=600 _3⁄4 , or Δ/ _ΚΑ =625 &.

 With reference to the sixth possible implementation manner of the third aspect, in a seventh possible implementation, the resource configuration information is one or more physical resource block indexes, where each physical resource block index indicates one physical resource Piece. A fourth aspect provides a method for transmitting a random access preamble, where the random access preamble includes a preamble sequence and a cyclic prefix, and the user equipment transmits the random access preamble to initiate random access, where the method is Includes:

Transmitting, by the user equipment, preamble configuration information and resource configuration information, where the preamble configuration information indicates a parameter used to generate a random access preamble, where the resource configuration information indicates a resource that can be used to transmit a random access preamble; The frequency bandwidth of the resource used for transmitting the random access preamble is at least ^ physical resource block, which is an integer, and 1 ≤ I ^CH ≤ 3;

Receiving, by the user equipment, the random access preamble transmitted on a resource whose frequency bandwidth is N^ ^OT physical resource blocks;

Wherein, the physical resource blocks ^Ν Η ^CH subcarriers comprising,

_N RACH ^ is an integer, and Δ / _ΚΑ is between the subcarriers of the random access preamble

Separated, and 312.5Hz ≤ Af^ ≤ 625 Hz.

In a first possible implementation manner of the fourth aspect, the parameter used by the preamble configuration information to generate a random access preamble includes a preamble format index, where the preamble format index corresponds to a set of preamble formats, the group The preamble format includes at least two preamble formats, wherein each preamble format indicates a time domain duration T _SEQ of the preamble sequence in the random access preamble, and a time domain duration T ¹ CP of the cyclic prefix: The random access preamble is consistent with the first preamble format, and the first preamble format indicates. The following conditions are met: T _SE0 , N is a positive integer.

In a second possible implementation manner of the fourth aspect, the parameter used by the preamble configuration information to generate a random access preamble includes a set of preamble format indexes, where the set of preamble format indexes corresponds to a set of preamble formats, The set of preamble format indexes includes at least two preamble format indexes, and each preamble format index corresponds to one preamble format, and each preamble format indicates a time domain duration T _SEQ of the preamble sequence in the random access preamble, And the time domain duration T _{CP of the} cyclic prefix;

The random access preamble is consistent with the first preamble format, and the first preamble format indicates. The following conditions are met: T _SE0 , N is a positive integer.

 With reference to any one of the possible implementations of the fourth aspect to the second possible implementation manner of the fourth aspect, in a third possible implementation manner, the preamble configuration information is used to generate a random access preamble The parameter includes a root sequence index, where the value of the root sequence index is:

[0, N _zc - 2] , N _ze is the largest prime number less than or equal to, wherein

/ _G ≥30.

With reference to any one of the possible implementations of the third aspect to the third possible implementation of the fourth aspect, in a fourth possible implementation, N ^CH = \ ', Δ / _ΚΑ = 500 _3⁄4 , Δ / _ΚΑ = 600 _3⁄4 , or Δ/ _ΚΑ = 625 &.

 With reference to the fourth possible implementation manner of the fourth aspect, in a fifth possible implementation, the resource configuration information is one or more physical resource block indexes, where each physical resource block index indicates one physical resource Piece. In a fifth aspect, a user equipment is provided, the user equipment comprising: a bus, and a processor, a memory, and an interface connected to the bus; the memory is configured to store an instruction; the processor executes the instruction for :

Receiving preamble configuration information and resource configuration information sent by the network side device, where the preamble configuration information indicates a parameter used to generate a random access preamble, and the resource configuration information indication can be used for transmission The frequency of the resource that can be used to transmit the random access preamble is at least one physical resource block, where ^ is an integer, and 1 ≤ ^CH ≤ 3;

 Generating a random access preamble according to the preamble configuration information;

 Determining, according to the resource configuration information, a resource used for transmitting the random access preamble, and using the resource to transmit the random access preamble;

The frequency bandwidth of the resource used for transmitting the random access preamble is N^ ^H physical resource blocks, and the N^ ^OT physical resource blocks include Λ3⁄4^ subcarriers, _Ν Η ,

N^ ^CH is an integer, Δ/^ is the subcarrier spacing of the random access preamble, and 312.5 _3⁄4 ≤ Δ _ΚΑ ≤ 625 Hz.

In a first possible implementation manner of the fifth aspect, the parameter that is used by the preamble configuration information to generate a random access preamble includes a preamble format index, where the preamble format index corresponds to a set of preamble formats, where the group The preamble format includes at least two preamble formats, wherein each preamble format indicates a time domain duration T _SEQ of the preamble sequence in the random access preamble, and a time domain duration of the cyclic prefix

¹ CP,

 Generating a random access preamble according to the preamble configuration information, including:

Determining a first preamble format in the set of preamble formats, and generating a random access preamble that conforms to the first preamble format; wherein, the first preamble format indicates that 7 satisfies the following condition: Td N is a positive integer. In a second possible implementation manner of the fifth aspect, the parameter used by the preamble configuration information to generate a random access preamble includes a set of preamble format indexes, where the set of preamble format indexes corresponds to a set of preamble formats, The set of preamble format indexes includes at least two preamble format indexes, and each preamble format index corresponds to one preamble format, and each preamble format indicates a time domain duration T _SEQ of the preamble sequence in the random access preamble, And the time domain duration T _{CP of the} cyclic prefix;

 Generating a random access preamble according to the preamble configuration information, including:

Determining a first preamble format in the set of preamble formats, and generating a random access preamble that conforms to the first preamble format; wherein, the first preamble format indication 7^ satisfies the following conditions: W is a positive integer.

 With reference to the first or second possible implementation manner of the fifth aspect, in a third possible implementation manner, when the user equipment determines that the random access fails, the executing the instruction by the processor is further used to: Determining a second preamble format in the set of preamble formats, and generating a second random access preamble that conforms to the second preamble format; wherein the second preamble format indication 7 satisfies the following conditions:

T M is an integer greater than N;

 And determining, according to the resource configuration information, a resource used for transmitting the second random access preamble, and transmitting, by using the resource, the second random access preamble.

 With reference to any one of the first to third possible implementation manners of the fifth aspect, in a fourth possible implementation, before determining the first preamble format in the set of preamble formats, And/or, before determining the second preamble format in the set of preamble formats, the processor executing the instruction is further used to:

 Determining channel quality information between the user equipment and the network side device;

 Determining the first preamble format in the set of preamble formats, and/or determining the second preamble format in the set of preamble formats, including:

 Determining a first preamble format according to channel quality information between the user equipment and the network side device; and/or,

Determining a second preamble format according to channel quality information between the user equipment and the network side device. With reference to any one of the possible implementation manners of the fifth aspect to the fourth possible implementation manner of the fifth aspect, in a fifth possible implementation manner, the preamble configuration information is used to generate a random access preamble The parameter includes a root sequence index, where the value of the root sequence index is: a maximum prime number, where

 Generating a random access preamble according to the preamble configuration information, including:

And generating, according to the root sequence index, a root ZC sequence, where the sequence length of the root ZC sequence is N _zc ; and generating a random access preamble according to the root ZC sequence. With reference to any one of the possible implementations of the fifth aspect to the fifth possible implementation of the fifth aspect, in a sixth possible implementation, N ^CH = \ ', Δ / _ΚΑ = 500 _3⁄4 , Δ / _ΚΑ = 600 _3⁄4 , or Δ/ _ΚΑ = 625 &.

 With reference to the sixth possible implementation manner of the fifth aspect, in a seventh possible implementation, the resource configuration information is one or more physical resource block indexes, where each physical resource block index indicates one physical resource Piece. According to a sixth aspect, a network side device is provided, where the network side device includes: a bus, and a processor, a memory, and an interface connected to the bus; the memory is configured to store an instruction; the processor executes the instruction Used for:

Transmitting, by the user equipment, preamble configuration information and resource configuration information, where the preamble configuration information indicates a parameter used to generate a random access preamble, where the resource configuration information indicates a resource that can be used to transmit a random access preamble; The frequency bandwidth of the resource used for transmitting the random access preamble is at least ^ physical resource blocks, which is an integer, and 1≤I ^CH ≤3;

Receiving, by the user equipment, the random access preamble transmitted on a resource whose frequency bandwidth is N^ ^OT physical resource blocks;

Wherein, the physical resource blocks ^Ν Η ^CH subcarriers comprising,

_N RACH is an integer, ^ ^ is between the subcarriers of the random access preamble

Separated, and 312.5Hz ≤ Af^ ≤ 625 Hz.

In a first possible implementation manner of the sixth aspect, the parameter used by the preamble configuration information to generate a random access preamble includes a preamble format index, where the preamble format index corresponds to a set of preamble formats, the group The preamble format includes at least two preamble formats, wherein each preamble format indicates a time domain duration T _SEQ of the preamble sequence in the random access preamble, and a time domain duration of the cyclic prefix

¹ CP,

 The random access preamble conforms to a first preamble format, and the first preamble format indicates

7^. The following conditions are met: T _SE0 , N is a positive integer.

In a second possible implementation manner of the sixth aspect, the preamble configuration information is used to indicate The parameter for generating a random access preamble includes a set of preamble format indexes, where the set of preamble format indexes corresponds to a set of preamble formats, wherein the set of preamble format indexes includes at least two preamble format indexes, and each preamble format index Corresponding to a preamble format, each preamble format indicating a time domain duration T _SEQ of the preamble sequence in the random access preamble, and a time domain duration T _{cp of the} cyclic prefix;

 The random access preamble conforms to a first preamble format, and the first preamble format indicates

7^. The following conditions are met: T _SE0 = i , N is a positive integer. With reference to any one of the possible implementation manners of the second aspect, the second possible implementation manner, in the third possible implementation manner, the preamble configuration information is used to generate a random access preamble The parameter includes a root sequence index, where the value of the root sequence index is:

[0, N _zc - 2] , N _ze is the largest prime number less than or equal to, wherein

/ _G ≥30.

With reference to any one of the possible implementations of the third aspect to the third possible implementation of the sixth aspect, in a fourth possible implementation, N ^CH ii \ ', Δ / _ΚΑ = 500 _3⁄4 , Δ / _ΚΑ = 600 _3⁄4 , or Δ/ _ΚΑ = 625 &.

 With reference to the fourth possible implementation manner of the sixth aspect, in a fifth possible implementation, the resource configuration information is one or more physical resource block indexes, where each physical resource block index indicates one physical resource Piece.

 With the above scheme, the subcarrier spacing and the frequency bandwidth of the random access channel are optimized, and the subcarrier spacing in the present invention is more compared with the prior art using the subcarrier spacing of 1.25 , and the frequency bandwidth of the 6 PRB. Small, the frequency bandwidth is narrower. Therefore, at least the following beneficial effects can be obtained by using the solution provided by the embodiment of the present invention:

 1. The smaller subcarrier spacing can improve the power spectral density of the random access preamble on the one hand, and ensure the detection performance of the random access preamble on the other hand, thereby achieving the coverage enhancement effect.

 2. A narrower frequency bandwidth can save the spectrum resource overhead of the random access preamble, thereby improving resource utilization.

DRAWINGS

In order to explain the technical solution of the embodiment of the present invention more clearly, the following describes the embodiment. BRIEF DESCRIPTION OF THE DRAWINGS The drawings used in the following description are briefly introduced. It is obvious that the drawings in the following description are only some embodiments of the present invention, and those skilled in the art can, without any creative work, Other figures are obtained from these figures.

 FIG. 1 is a schematic flowchart of a method for transmitting a random access preamble according to an embodiment of the present invention;

 2 is a schematic structural diagram of a preamble sequence according to an embodiment of the present invention;

 3 is a schematic structural diagram of another preamble sequence according to an embodiment of the present invention;

 4 is a schematic structural diagram of another preamble sequence according to an embodiment of the present invention;

 FIG. 5 is a schematic flowchart of another method for transmitting a random access preamble according to an embodiment of the present invention;

 FIG. 6 is a schematic structural diagram of a user equipment according to an embodiment of the present disclosure;

 FIG. 7 is a schematic structural diagram of a network side device according to an embodiment of the present disclosure;

 FIG. 8 is a schematic structural diagram of another user equipment according to an embodiment of the present disclosure;

 FIG. 9 is a schematic structural diagram of another network side device according to an embodiment of the present invention.

detailed description

 The technical solutions in the embodiments of the present invention are clearly and completely described in the following with reference to the accompanying drawings in the embodiments of the present invention. It is obvious that the described embodiments are only a part of the embodiments of the present invention, but not all embodiments. All other embodiments obtained by a person of ordinary skill in the art based on the embodiments of the present invention without creative efforts are within the scope of the present invention.

 The technical solution provided by the following embodiments of the present invention can be applied to a wireless communication network, for example, a long term evolution (LTE) system, an advanced long term evolution advanced (LTE-A) system, and Its further evolutionary network.

The base station (base station, abbreviated as BS) and user equipment (UE) may be included in the wireless communication network. The base station may be a device that communicates with a user equipment or other communication site such as a relay station. The base station can provide communication coverage for a particular physical area. For example, the base station may specifically be an evolved base station (hereinafter referred to as ENB or eNodeB) in LTE; or may be another access network device in the wireless communication network that provides access services. In this embodiment of the present invention, UEs may be distributed throughout the wireless network, and each UE may be static or mobile. A UE may be referred to as a terminal, a mobile station, a subscriber unit, a station, or the like. The UE may specifically be a cellular communication device, a personal digital assistant (PDA), a handheld device, a laptop computer, or the like. When the UE is applied to the machine to machine (M2M) communication, the UE may be referred to as an M2M terminal, and may specifically be a device that supports M2M communication, such as a smart meter or a smart home appliance.

 An embodiment of the present invention provides a method for transmitting a random access preamble. The execution host of the method is a user equipment. As shown in FIG. 1, the method includes:

 The user equipment receives the preamble configuration information and the resource configuration information sent by the network side device, where the preamble configuration information indicates a parameter used to generate a random access preamble, where the resource configuration information indicates a resource that can be used to transmit the random access preamble.

The frequency bandwidth of the resource that can be used for transmitting the random access preamble is at least ^CH physical resource blocks, where ^ is an integer, and 1≤Ν ≤3.

 It should be noted that, in the mobile communication system, the user equipment is a mobile terminal, and the network side device is a base station. In a wider Internet of Things, two devices that establish a communication connection through random access may be, but are not limited to, a mobile terminal. And the base station, for the sake of convenience, the network side device described in the embodiment of the present invention can be regarded as a base station, and the user equipment can be regarded as a mobile terminal.

 S102: The user equipment generates a random access preamble according to the preamble configuration information.

 The random access preamble includes a preamble sequence and a cyclic prefix.

 5103. The user equipment determines, according to the resource configuration information, a resource used for transmitting the random access preamble, and uses the resource to transmit the random access preamble.

The frequency bandwidth of the resource used for transmitting the random access preamble is N ^OT physical resource blocks, where the physical resource block includes Λ 3⁄4 ^ subcarriers, _C H=1 _{x C} H ,

N^ ^CH is an integer, Δ/ _{ΚΑ is} the subcarrier spacing of the random access preamble, and 312.5 Hz ≤ Af _RA ≤ 625 Hz.

For example, in the LTE system, the preamble sequence may be a "Zadoff-Chu" (ZC for short) sequence. The ZC sequence is a non-binary unit amplitude sequence that satisfies the CAZAC (Constant Amplitude Zero Autocorrelation) feature. The advantage of the C AZAC feature is that a cyclic shift (referred to as CS) of the same ZC sequence can produce multiple orthogonal sequences.

The periodic autocorrelation of the ZC sequence only peaks at zero. After the cyclic shift operation of the ZC sequence, the periodic correlation between the obtained ZC sequence and the original ZC sequence only appears at a peak, which is a cyclic shift value of the ZC sequence. This causes the two ZC sequences to produce a Zero-Correlation Zone. If the zero autocorrelation region is able to cope with the maximum time difference between the two sequences of transmissions, then the two sequences are two orthogonal sequences.

 The ZC sequence can be expressed as:

Xu M ^ ³ w _ZC , ₀ ≤ « ≤ N _ZC - 1 where w is the root sequence index of the ZC sequence, also known as the root index, the value of which can be determined by the preamble configuration information. N _{ze is} the length of the ZC sequence, and its value can be set in advance. Preferably, N _ze is a prime number. Since the preamble sequence is mapped to the subcarriers, when N _ze is preset, considering that part of the subcarriers need to be reserved for the frequency domain guard interval, the value of N _ze should be less than N ^OT .

 Specifically, the user equipment may generate a root ZC sequence according to the determined root index of the ZC sequence, and perform cyclic shift based on the root ZC sequence to obtain multiple preamble sequences, and determine a preamble to be used according to the configuration of the random access channel. sequence. When generating a random access preamble, the preamble format of the random access preamble is also considered, and the preamble format indicates the time domain duration of the preamble sequence in the random access preamble 7 and the time domain duration of the cyclic prefix Γ^. The preamble format can also be indicated by the preamble configuration information.

 For example, the parameter for generating the random access preamble indicated by the preamble configuration information includes a preamble format index, and after obtaining the preamble format index, the user equipment may perform a correspondence between the preamble format and the preamble format according to a predefined preamble format, as specified in the protocol. The preamble format index and the corresponding table of the preamble format determine the preamble format. For more detailed implementation details, reference may be made to the existing technologies in the current LTE system, and details are not described herein again.

It should be noted that, in the solution provided by the embodiment of the present invention, the subcarrier spacing and the frequency bandwidth of the random access channel are optimized. Using the sub-load of 1.25KZ with the prior art Compared with the frequency bandwidth of the 6PRB, the subcarrier spacing in the embodiment of the present invention is smaller and the frequency bandwidth is narrower. With the solution provided by the embodiment of the present invention, at least the following beneficial effects can be obtained:

 1. Smaller subcarrier spacing can improve the power spectral density of the random access preamble on the one hand, and ensure the detection performance of the random access preamble on the other hand, thereby achieving the coverage enhancement effect.

 2. A narrower frequency bandwidth can save the spectrum resource overhead of the random access preamble, thereby improving resource utilization.

 In addition, the user equipment in the embodiment of the present invention can transmit the random access preamble with lower transmit power than the prior art, which saves power, in the scenario of the same cell radius. Consumption.

As an optional implementation, in step S102, the parameter for generating a random access preamble indicated by the preamble configuration information further includes a root sequence index, where the value of the root sequence index is: [0, N _ze _ 2] , N _ze is the largest prime number less than or equal to x N ^-,

Medium, f _GI ≥ 30KHz. The user equipment generates a root ZC sequence according to the root sequence index, and the sequence length of the root ZC sequence is N _ze , and generates a random access preamble according to the root ZC sequence.

It should be noted that the / _{σ /} is the frequency interval guard interval ( GI ), and its specific value has many possibilities, where / _σ ≥ 3 (λ Ο ζ is only one possibility. Preferably, it is an integer. Times.

 Specifically, the root sequence index may be a physical root sequence index or a logical root sequence index. If the root sequence index is a logical root sequence index, the mapping relationship between the logical root sequence index V and the physical root sequence index w needs to be set in advance. In this way, the user equipment can determine the corresponding physical root sequence index according to the logical root sequence index indicated by the preamble configuration information and the mapping relationship.

或者，该映射关系还可以是预先定义的逻辑根序列索引 V与物理根序 列索引 w的对应关系表。 以 N ^OT = 1 且 ^=500 ^为例， 此时可以预先 规定 N_ze的取值为 293 , 并定义如下表 1所示的对应关系表。 The mapping relationship can be as follows:

Alternatively, the mapping relationship may also be a predefined logical root sequence index V and a physical root sequence. Correspondence table of column index w. Taking N ^OT = 1 and ^=500 ^ as an example, the value of N _ze can be pre-specified as 293, and the correspondence table shown in Table 1 below is defined.

In addition, when the user equipment performs cyclic shift based on the root ZC sequence, the cyclic shift value may be preset or configured by using the foregoing preamble configuration information. When the configuration is performed by the above-described preamble configuration information, the correspondence between the cyclic shift configuration (for example, zero autocorrelation region configuration) and the cyclic shift value can be defined in advance. For example, when the length of the current pilot sequence is 29 3 as an example, the correspondence may be as shown in Table 2 below.

Table 1. Correspondence table between logical root sequence index and physical root sequence index

表 2、 N^配置与 N^值的对应关系表

Table 2, the correspondence between N^ configuration and N^ value

例如， 确定该 N^的配置为 0 , 相应地 N^值为 13 , 则每一个根 ZC 序列可以通过循环移位， 得到 L293 / 13」 = 22个前导序列。

For example, if the configuration of the N^ is 0, and the corresponding N^ value is 13, then each root ZC sequence can be cyclically shifted to obtain L293 / 13" = 22 preamble sequences.

 It should be noted that the root sequence index indicated by the preamble configuration information may be multiple. As described above, the user equipment finally generates 22 preamble sequences according to a root sequence index, if the root sequence index indicated by the logical preamble configuration information is Three, the user equipment can eventually generate 66 preamble sequences to meet different needs. In a specific implementation, the preamble configuration information may explicitly indicate multiple root sequence indexes, that is, the parameter used to generate the random access preamble indicated by the preamble configuration information includes multiple root sequence indexes; or may be implicit Indicates a plurality of root sequence indexes, that is, the parameter used to generate the random access preamble indicated by the preamble configuration information includes a root sequence index, but when other root sequence indexes are needed, the default is determined according to a preset root sequence index order.

In an optional implementation manner of the embodiment of the present invention, when ^CH =1, the resource configuration information in step S101 indicates that the resource that can be used to transmit the random access preamble is at least one object. Resource block. Optionally, the subcarrier spacing of the random access preamble generated in step S102 is Δ/ _ra = 500 3⁄4, ^ = 600 3⁄4, or ^ = 625/ &.

For example, the preset subcarrier spacing Δ / _ΚΑ = 500 _3⁄4 , so that since the frequency domain bandwidth of a PRB (physical resource block) is 180Kfe, there are 360 subcarriers in one PRB, wherein, in order to ensure The length of the preamble sequence is less than or equal to

1 _{χ Ν} Η- prime number, taking / _{σ =30ΚΗζ} as an example, and guarantee a certain spread spectrum increase

Preferably, the length of the selectable leader sequence is 293, 283 or 281. As shown in Fig. 2, the length of the leader sequence is 293, and the lengths of the guard bands on both sides of the leader sequence are 33 and 34, respectively.

 Optionally, as shown in FIG. 3, the subcarrier spacing is preset to 600 3⁄4, the length of the preamble sequence is 251, and the guard bands on both sides of the preamble sequence are 24 and 25, respectively.

 Optionally, as shown in FIG. 4, the subcarrier spacing is preset to 625 Hz, the length of the preamble sequence is 241, and the guard bands on both sides of the preamble sequence are 23 and 24, respectively.

 It should be noted that the resource configuration information in step S101 is one or more physical resource block indexes, where each physical resource block index indicates one physical resource block, and the resource configuration information may be according to a preset random access preamble. The number of occupied physical resource blocks is specifically configured. For the case where the random access preambles shown in FIG. 2, FIG. 3, and FIG. 4 occupy only one physical resource block, the resource configuration information may be a physical resource block index, which is unique. Indicates a physical resource block for transmitting the random access preamble. Of course, the resource configuration information may also be a plurality of physical resource block indexes, indicating that multiple physical resource blocks that can be used to transmit the random access preamble are randomly selected by the user equipment. The invention is not limited thereto.

In addition, the physical resource block index may be used to indicate a resource offset, and the user equipment determines, according to the resource offset, a resource number of a physical resource block used for transmitting a random access preamble. For example, if the number of the initial physical resource block is 0 and the resource offset is 90, the number of the starting physical resource block used to transmit the random access preamble is 90. In this way, for a random access preamble occupying one physical resource block, the user equipment transmits the random access preamble by using the physical resource block with the number of 90, and the user equipment utilizes the random access preamble occupying three physical resource blocks. The three physical resource blocks numbered 90, 91, and 92 transmit the random access preamble. The preamble sequence provided by the foregoing is only a preferred mode provided by the embodiment of the present invention. In a specific application, the preamble sequence may be set in other manners. For example, when the subcarrier spacing is 5QQHZ, the preamble sequence length is 283; For 600 3⁄4, the length of the preamble sequence is 241, etc. At the same time, the subcarrier spacing can be reduced and the length of the preamble sequence can be shortened so that the preamble sequence occupies two or three physical resource blocks, which is not enumerated here.

It should be further noted that the time domain duration T _cp of the cyclic prefix in the random access preamble is related to the cell radius, and the time domain duration of the preamble sequence is related to the number of repetitions of the preamble sequence in the random access preamble. According to different combinations of 7^ and 7 in the random access preamble, multiple random access preamble formats can be defined.

 Optionally, the user equipment generates a random access preamble according to the preamble sequence, and at least includes the following two implementation manners:

The first step S102 includes: the parameter used to generate the random access preamble, where the preamble configuration information includes a preamble format index, where the preamble format index corresponds to a set of preamble formats, and the set of preamble formats includes at least two preamble formats. Wherein, each preamble format indicates a time domain duration T _SEQ of the preamble sequence in the random access preamble, and a time domain duration of the cyclic prefix is 7^, and the user equipment determines the first preamble in the set of preamble formats a format, and generating a random access preamble conforming to the first preamble format, where the first preamble format indicates that the following condition is met: N is a positive integer.

 For example, the user equipment adopts a preamble sequence as shown in FIG. 2, the subcarrier spacing is 500 Hz, and the sequence length is 293. Table 3 below provides random access preambles in 16 different formats: Table 3

2 24672-7； 860160 T_S

2 24672-7; 860160 T _S

3 24672-7; 2519040 T _S

3 0 45600-7; 61440 T _S

1 45600-7; 307200 T _S

2 45600-7; 860160 T _S

3 45600-7; 2457600 T _S

4 0 40928-7; 122880 ■T _S

1 40928-7; 307200 T _S

2 40928-7; 860160 T _S

 3 40928-7; 2519040 where T = ^ seconds.

30.72 xlO ⁶

 It can be seen from the above table 3 that the time combinations of 7^ and 7 are different in different preamble formats, wherein different preamble format indexes correspond to different maximum cell radii. In a possible implementation manner of the embodiment of the present invention, the preamble format index 1 The corresponding maximum cell radius is 14.53km; the maximum cell radius corresponding to the preamble format index 2 is 29.53km; the maximum cell radius corresponding to the preamble format index 3 is 77.34km; and the maximum cell radius corresponding to the preamble format index 4 is 100.16km. The time lengths of 7^ of different preamble formats applicable to the same maximum cell radius are consistent. For example, the length of time 7^ of the four preamble formats corresponding to the preamble format index 1 is 27744 · 7; For the same maximum cell radius, the number of repetitions of the preamble sequence in the random access preamble of different preamble formats is different, and as the number of repetitions of the preamble sequence increases, the coverage of the random access preamble generated according to the preamble format is enhanced (correspondence table) The increase in the coverage level index value in 3), the coverage refers to the range of distances that the random access preamble can be transmitted.

 It should be noted that, in the prior art, five different formats of the random access preamble are defined, and the preamble format indexes are respectively 0 to 4. The user equipment determines the unique format by using different preamble format indexes according to different maximum cell radii. The random access preamble, in the embodiment of the present invention, the user equipment may select a preamble format from the plurality of preamble formats corresponding to the preamble format index to generate a random connection conforming to the format according to the preamble format index sent by the network side device. Random access is introduced into the preamble, and the implementation is more flexible.

Optionally, before determining, by the user equipment, the first preamble format in the set of preamble formats, The channel quality information between the user equipment and the network side device is determined, and the user equipment determines the first preamble format according to channel quality information between the user equipment and the network side device.

 Optionally, in the process of initiating downlink synchronization to the user equipment, the network device may determine, according to the downlink synchronization time, channel quality information between the network side device and the network side device, where the user equipment is in good channel quality, The preamble format corresponding to the low coverage level index may be selected to generate a random access preamble; when the channel quality is poor, the preamble format corresponding to the high coverage level index may be selected to generate a random access preamble, where, by Table 3, The coverage index value is increased, and the coverage capability of the random access preamble corresponding to the preamble format is enhanced. In this way, the embodiment of the present invention improves the success rate of random access of the user equipment by transmitting the random access preamble of the unique preamble format to the network side device.

 In addition, the user equipment may also randomly determine a preamble format corresponding to the preamble format index to generate a random access preamble according to the preamble format index, or may select a preamble format by default, for example, a preamble with a coverage level index of 0 is selected by default. The format generates a random access preamble, which is not limited by the present invention.

 In addition, in combination with the prior art, in a possible implementation manner of the embodiment of the present invention, the index of the preamble format of the random access preamble defined in the embodiment of the present invention is 5 to 8, which is in the prior art. The combination of four different preamble formats from 0 to 4 is shown in Table 4 below: Table 4

2 24672-7； 860160 T_s

2 24672-7; 860160 T _s

3 24672-7; 2519040 T _s

7 0 45600-7; 61440 T _s

1 45600-7; 307200 T _s

2 45600-7; 860160 T _s

3 45600-7; 2457600 T _s

8 0 40928-7; 122880 T _s

1 40928-7; 307200 T _s

2 40928-7; 860160 T _s

 3 40928-7; 2519040

 In this way, the user equipment generates a random access preamble according to the preamble format defined in the prior art when determining that the value of the preamble format index is 0 to 4; determining that the preamble format index is 5 to 8 In any case, the user equipment can flexibly select one preamble format to generate a random access preamble in multiple preamble formats corresponding to the preamble format index, which improves the versatility of the embodiment of the present invention.

For example, the user equipment adopts a preamble sequence as shown in FIG. 3, the subcarrier spacing is 600 Hz, and the sequence length is 251. Table 5 below provides 16 random access preambles in different formats:

3 30720-7； 2867200-7；

3 30720-7; 2867200-7;

 It should be noted that, in the prior art, five different formats of the random access preamble are defined, and the preamble format index is 0 to 4, respectively. In combination with the prior art, a possible implementation manner of the embodiment of the present invention is required. The index of the preamble format of the random access preamble defined in the embodiment of the present invention is 5 to 8 respectively. For details, refer to the description corresponding to the above table 4, and details are not described herein again.

 For example, the user equipment adopts a preamble sequence as shown in FIG. 4, the subcarrier spacing is 625 Hz, and the sequence length is 241. Table 6 below provides random access preambles in 16 different formats: Table 6

 It should be noted that, in the prior art, five different formats of the random access preamble are defined, and the preamble format index is 0 to 4, respectively. In combination with the prior art, a possible implementation manner of the embodiment of the present invention is required. The index of the preamble format of the random access preamble defined in the embodiment of the present invention is 5 to 8 respectively. For details, refer to the description corresponding to the above table 4, and details are not described herein again.

In the second method, the step S102 includes: the parameter for generating the random access preamble indicated by the preamble configuration information includes a set of preamble format indexes, where the set of preamble format indexes corresponds to a set of preamble formats, where the set of preamble format indexes Contains at least two preamble format indexes, and Each preamble format index corresponds to a preamble format, each preamble format indicating a time domain duration r _CT of the preamble sequence in the random access preamble, and a time domain duration 循环^ of the cyclic prefix, where the user equipment is at the The first preamble format is determined in the group preamble format, and a random access preamble corresponding to the first preamble format is generated. The first preamble format indicates that the following condition is met: N is a positive integer.

 It should be noted that, regarding the setting of the preamble format, reference may be made to the corresponding description in the first mode. The second method differs from the first mode in that the user equipment determines the preamble format according to the preamble format index.

 For example, the user equipment adopts a preamble sequence as shown in FIG. 2, the subcarrier spacing is 500 Hz, and the sequence length is 293. Table 7 below provides random access preambles in 16 different formats: Table 7

As shown in the above table 7, each preamble format index corresponds to a preamble format, and the parameter for generating a random access preamble indicated by the preamble configuration information includes a set of preamble format indexes, so that if the set of preamble format indexes are respectively 0 and 1, the user equipment can select the preamble format corresponding to the preamble format index 0 to generate a random access preamble, or select a preamble format. The preamble format corresponding to the first embodiment generates a random access preamble. Compared with the prior art, the user equipment generates a random access preamble according to a preamble format index, and the implementation manner of the embodiment of the present invention is more flexible.

 It should be noted that, in the prior art, five different formats of the random access preamble are defined, and the preamble format index is 0 to 4, respectively. In combination with the prior art, a possible implementation manner of the embodiment of the present invention is required. The preamble format index of the random access preamble defined in the embodiment of the present invention is 5 to 20, respectively. As shown in Table 8 below:

 Table 8

0 7263-7； 51200-7； For example, the user equipment adopts a preamble sequence as shown in FIG. 3, the subcarrier spacing is 600 Hz, and the sequence length is 251. Table 9 below provides random access preambles in 16 different formats: Table 9

0 7263-7; 51200-7;

 1 27744-7; 307200-7;

 2 17564-7; 1023898-7;

 3 7254-7; 2816102-7;

 4 14431-7; 102400-7;

 5 34912-7; 358400-7;

 6 24672-7; 1075200-7;

 7 14431-7; 2867200-7;

 8 25119-7; 51200-7;

 9 45600-7; 307200-7;

 10 35360-7; 1023898-7;

 11 25120-7; 2816102-7;

 12 30720-7; 102400-7;

 13 40928-7; 358400-7;

 14 40928-7; 1075200-7;

 15 30720-7; 2867200-7;

 It should be noted that, in the prior art, five different formats of the random access preamble are defined, and the preamble format index is 0 to 4, respectively. In combination with the prior art, a possible implementation manner of the embodiment of the present invention is required. The index of the preamble format of the random access preamble defined in the embodiment of the present invention is 5 to 20 respectively. For details, refer to the description corresponding to the foregoing Table 8, and details are not described herein again.

 For example, the user equipment adopts a preamble sequence as shown in FIG. 4, the subcarrier spacing is 625 Hz, and the sequence length is 241. Table 10 below provides random access preambles in 16 different formats: Table 10

12 34816-7； 98304-7；

12 34816-7; 98304-7;

 13 34816-7; 344064-7;

 14 47072-7; 1069056-7;

 15 47072-7; 2850816-7;

 It should be noted that, in the prior art, five different formats of the random access preamble are defined, and the preamble format index is 0 to 4, respectively. In combination with the prior art, a possible implementation manner of the embodiment of the present invention is required. The index of the preamble format of the random access preamble defined in the embodiment of the present invention is 5 to 20 respectively. For details, refer to the description corresponding to the foregoing Table 8, and details are not described herein again.

 The foregoing mode 1 and mode 2 are only preferred implementation manners in the embodiment of the present invention. In a specific application, the user may also define other preamble formats and determine the preamble format of the random access preamble by other methods, which is not limited by the present invention. .

 In addition, the different preamble sequence lengths and subcarrier spacings, the correspondence between the root sequence index and the root ZC sequence index configured in the user equipment, and the number of cyclic shifts Ncs are different, and the configuration of the preamble sequence shown in FIG. 2 is met. For the configuration of the preamble sequence shown in FIG. 3 or FIG. 4, refer to the descriptions of Table 1 and Table 2 above, and details are not described herein again.

Further, when the user equipment determines that the random access fails, determining a second preamble format in the set of preamble formats, and generating a second random access preamble that conforms to the second preamble format; wherein the second preamble format Indicated 7 _£ . The following conditions are met: M is greater than

 An integer of N, the user equipment determines, according to the resource configuration information, a resource for transmitting the second random access preamble, and uses the resource to transmit the second random access preamble.

It should be noted that the user equipment can determine the random access failure in different manners, which can be preset by the user. For example, the user equipment starts the random access preamble and starts the timer. If the user equipment meets the timer. Before the preset time threshold, the feedback information of the network side device is not received, and the random access failure is determined; or the user equipment does not receive the feedback information of the network side device, and the random access preamble is performed. The retransmission is performed, and the number of retransmissions is counted. When the feedback information of the network side device is not received after retransmission for n times, the random access failure is determined, where n is a positive integer greater than or equal to 1. Due to the 7^ indicated by the second preamble format. Meet the following conditions: T _SEO , M is large

An integer of N indicates that the number of repetitions of the preamble sequence in the second random access preamble is greater than the random access preamble generated by the user equipment according to the first preamble format, so that the user equipment performs the random access preamble with a larger coverage area. Random access, which reduces the number of times of random transmission of the random access sequence, and the user equipment in the prior art repeatedly transmits the random access sequence of the same preamble format to perform random access, and the embodiment of the present invention reduces random access of the user equipment. Waiting time.

 Optionally, before determining the second preamble format in the set of preamble formats, determining, by the user equipment, channel quality information between the user equipment and the network side device, and according to channel quality information between the user equipment and the network side device, Determine the second preamble format. For details, refer to the description of the channel quality information between the user equipment and the network side device before the user equipment determines the first preamble format in the set of preamble formats, and details are not described herein.

 With the above method, the method optimizes the subcarrier spacing and the frequency bandwidth of the random access channel, compared with the prior art using the subcarrier spacing of 1.25K 3⁄4, and the frequency bandwidth of the 6PRB, in the embodiment of the present invention. The subcarrier spacing is smaller, thereby improving the power spectral density of the random access preamble, and ensuring the detection performance of the random access preamble to achieve the coverage enhancement effect. In addition, the frequency bandwidth in the embodiment of the present invention is narrower, saving The spectrum resource overhead of the preamble is randomly accessed, thereby improving resource utilization. An embodiment of the present invention provides a method for transmitting a random access preamble, where the execution entity of the method is a network side device, as shown in FIG. 5, the method includes:

 S501: The network side device sends, to the user equipment, preamble configuration information and resource configuration information, where the preamble configuration information indicates a parameter used to generate a random access preamble, where the resource configuration information indicates a resource that can be used to transmit a random access preamble.

The frequency bandwidth of the resource that can be used for transmitting the random access preamble is at least ^CH physical resource blocks, where ^ is an integer, and 1 ≤ N^ ^OT ≤ 3.

It should be noted that, in the mobile communication system, the network side device is a base station, and the user equipment is a mobile terminal, and in a wider Internet of Things, a communication connection is established through random access. The device of the present invention can be, but is not limited to, a mobile terminal and a base station. For the sake of convenience, the network side device described in the embodiment of the present invention can be regarded as a base station, and the user equipment can be regarded as a mobile terminal.

S 502. The network side device receives the random access preamble transmitted by the user equipment on a resource whose frequency bandwidth is ^OT physical resource blocks.

The N ^CH physical resource blocks include N ^H subcarriers.

_N RACH is an integer, and Δ/^ is between the subcarriers of the random access preamble

Separated, and 312.5Hz ≤ Af^ ≤ 625 Hz.

Specifically, the parameter for generating the random access preamble indicated by the preamble configuration information includes a root sequence index, where the value of the root sequence index is: [0, N _ze -2], and N _ze is less than or equal to The largest prime number of i _xA - , where f _Gi >^) _K H _z .

 The root sequence index may be a logical root sequence index or a physical root sequence index. For example, the user equipment generates a root ZC sequence according to the determined root index of the ZC sequence, and performs cyclic shift based on the root ZC sequence to obtain multiple preamble sequences, and determines the used preamble sequence according to the configuration of the random access channel. For a detailed description, refer to the description of generating a preamble sequence according to the root sequence index of the user equipment corresponding to the user equipments in Table 1 and Table 2 in the previous embodiment, and details are not described herein again.

In an optional implementation manner of the embodiment of the present invention, when ^CH =1, the resource configuration information in step S501 indicates that the resource that can be used to transmit the random access preamble is at least one physical resource block. Optionally, the subcarrier spacing of the random access preamble generated by the user equipment is Δ _ΚΑ = 500 ζ, Δ _ΚΑ = 600 _3⁄4 , or ^= 625 / &.

For example, the preset subcarrier spacing = 500 Hz, so that since the frequency domain bandwidth of one PRB is 180K 3⁄4, there are 360 subcarriers in one PRB, wherein, in order to ensure that the length of the preamble sequence is less than or equal to ^xN "- The prime number, for example, / _σ = 30 3⁄4,

And ensuring a certain spreading gain, the length of the selectable preamble sequence is an equal prime number of 293, 283 or 281. As shown in FIG. 2, the length of the preamble sequence is 293, and the lengths of the guard bands on both sides of the preamble sequence are respectively 33 and 34. Optionally, as shown in FIG. 3, the subcarrier spacing is preset to 600 3⁄4, the length of the preamble sequence is 25 1 , and the guard bands on both sides of the preamble sequence are 24 and 25 respectively.

 Optionally, as shown in FIG. 4, the subcarrier spacing is preset to 625 Hz, the length of the preamble sequence is 241, and the guard bands on both sides of the preamble sequence are 23 and 24, respectively.

 It should be noted that the resource configuration information in step S501 is one or more physical resource block indexes, where each physical resource block index indicates one physical resource block, and the resource configuration information may be according to a preset random access preamble. The number of occupied physical resource blocks is specifically configured. For the case where the random access preambles shown in FIG. 2, FIG. 3, and FIG. 4 occupy only one physical resource block, the resource configuration information may be a physical resource block index, which is unique. Indicates a physical resource block for transmitting the random access preamble. Of course, the resource configuration information may also be a plurality of physical resource block indexes, indicating that multiple physical resource blocks that can be used to transmit the random access preamble are randomly selected by the user equipment. The invention is not limited thereto.

 In addition, the physical resource block index may be used to indicate a resource offset, and the user equipment determines, according to the resource offset, a resource number of a physical resource block used for transmitting a random access preamble. For example, if the initial physical resource block number is 0 and the resource offset is 90, the starting physical resource block used to transmit the random access preamble is numbered 90. In this way, for a random access preamble occupying one physical resource block, the user equipment transmits the random access preamble by using the physical resource block with the number of 90, and the user equipment utilizes the random access preamble occupying three physical resource blocks. The three physical resource blocks numbered 90, 91, and 92 transmit the random access preamble.

 The preamble sequence provided by the foregoing is only a preferred mode provided by the embodiment of the present invention. In a specific application, the preamble sequence may be set in other manners. For example, when the subcarrier spacing is 5QQHZ, the preamble sequence length is 283; For 600 3⁄4, the length of the preamble sequence is 241, etc. At the same time, the subcarrier spacing can be reduced and the length of the preamble sequence can be shortened so that the preamble sequence occupies two or three physical resource blocks, which is not enumerated here.

Further, when generating the random access preamble, the user equipment also needs to consider the preamble format of the random access preamble, where the preamble format indicates the time domain duration T _SEQ of the preamble sequence in the random access preamble, and the time of the cyclic prefix. The domain duration is T _cp . The preamble format can also be indicated by the preamble configuration information.

Optionally, the parameter used by the preamble configuration information to generate a random access preamble includes a preamble a format index, the preamble format index corresponding to a set of preamble formats, where the set of preamble formats includes at least two preamble formats, wherein each preamble format indicates a time domain duration of the preamble sequence in the random access preamble of 7, and a cyclic prefix The time domain duration is Γ^.

The random access preamble conforms to the first preamble format, and the first preamble format indicates that the following condition is met: T _SEO = i , where N is a positive integer.

 δ Af Specifically, the user equipment determines the first preamble format according to the preamble format index, and generates a random access preamble that conforms to the first preamble format. For the specific process, refer to the corresponding table 3 to table 6 in the previous embodiment. description.

Optionally, the parameter for generating a random access preamble indicated by the preamble configuration information includes a set of preamble format indexes, where the set of preamble format indexes corresponds to a set of preamble formats, where the set of preamble format indexes includes at least two a preamble format index, and each preamble format index corresponds to a preamble format, each preamble format indicating a time domain duration T _SEQ of the preamble sequence in the random access preamble, and a time domain duration of the cyclic prefix Γ^;

Specifically, the random access preamble conforms to the first preamble format, and the T _SEQ indicated by the first preamble format satisfies the following condition: T _SEO = i , where N is a positive integer. The user equipment determines the first preamble format according to the preamble format index, and generates a random access preamble that conforms to the first preamble format. For the specific process, refer to the descriptions of the corresponding tables 7 to 10 in the previous embodiment.

 With the above method, the method optimizes the subcarrier spacing and the frequency bandwidth of the random access channel, compared with the prior art using the subcarrier spacing of 1.25K 3⁄4, and the frequency bandwidth of the 6PRB, in the embodiment of the present invention. The subcarrier spacing is smaller, thereby improving the power spectral density of the random access preamble, and ensuring the detection performance of the random access preamble to achieve the coverage enhancement effect. In addition, the frequency bandwidth in the embodiment of the present invention is narrower, saving The spectrum resource overhead of the preamble is randomly accessed, thereby improving resource utilization.

The embodiment of the present invention provides a user equipment 60, which corresponds to the foregoing method embodiment of FIG. 1, and each functional unit of the user equipment 60 can be used in the foregoing method steps. As shown in Figure 6, User equipment 60 includes:

 The receiving unit 61 is configured to receive preamble configuration information and resource configuration information sent by the network side device, where the preamble configuration information indicates a parameter used to generate a random access preamble, where the resource configuration information indicates a resource that can be used to transmit a random access preamble .

Wherein the random access preamble can be used to transmit a frequency bandwidth of at least ^Ν Η physical resource blocks, ^ is an integer and 1≤ ^CH ≤3.

 The processing unit 62 is configured to generate a random access preamble according to the preamble configuration information received by the receiving unit 61, and determine, according to the resource configuration information received by the receiving unit 61, a resource for transmitting the random access preamble.

The sending unit 63 is configured to transmit the random access preamble by using the resource determined by the processing unit 62. The frequency bandwidth of the resource used for transmitting the random access preamble is a physical resource block, where the physical resource block includes Λ^ subcarriers, _Ν , d

The integer is the subcarrier spacing of the random access preamble, and 312.5 3⁄4 ≤ 4 ^ ≤ 625 3⁄4.

 The value indicates that the user equipment 60 may be referred to as a terminal, a mobile station, a subscriber unit, a station, etc., and may specifically be a wireless communication device such as a cellular phone, a personal digital assistant, a handheld device, or a laptop computer. When the user equipment 60 is applied to the Μ2Μ communication, the user equipment 60 may be referred to as a Μ2Μ terminal, and may specifically be a smart meter, a smart home appliance, or the like that supports the Μ2Μ communication.

Optionally, the parameter used by the preamble configuration information to generate a random access preamble includes a root sequence index, where the root sequence index has a value range of: [0, N _ze - 2], and N _ze is less than or The maximum prime number equal to xN ^-, where f _GI ≥ 2 KHz, the processing unit 62 is based on

And generating, by the receiving unit, the random access preamble, the processing unit 62, according to the root sequence index, generating a root ZC sequence, where the sequence length of the root ZC sequence is N _ze ; according to the root ZC sequence, Generate a random access preamble.

For example, the user equipment generates a root ZC sequence according to the root sequence index, and cyclically shifts the root ZC sequence to generate a plurality of preamble sequences, and the specific process may refer to the method embodiment corresponding to the foregoing FIG. It can be preset as shown in Table 1 in the embodiment of Fig. 1. A correspondence table between the logical root sequence index V and the physical root sequence index w and a correspondence table between the cyclic shift configuration and the cyclic shift value 所示 shown in Table 2.

In an optional implementation manner of the embodiment of the present invention, the resource configuration information received by the user equipment indicates that the resource that can be used to transmit the random access preamble is at least one physical resource block. Optionally, the subcarrier spacing of the random access preamble generated by the user equipment is Δ _ΚΑ = 500 ζ, Δ _ΚΑ = 600 _3⁄4 , or ^ = 625/ &.

For example, the preset subcarrier spacing Δ / _ΚΑ = 500, so that since the frequency domain bandwidth of one PRB is 180 Κ 3⁄4, there are 360 subcarriers in one PRB, wherein, in order to ensure that the length of the preamble sequence is less than or equal to x N The prime number of ^-, taking f _GI =WKHz as an example.

And to ensure a certain spread spectrum gain, the length of the selectable preamble sequence is 293, 283 or 281. As shown in Fig. 2, the length of the preamble sequence is 293, and the lengths of the guard bands on both sides of the preamble sequence are respectively 33 and 34.

 Optionally, as shown in FIG. 3, the subcarrier spacing is preset to 600 3⁄4, the length of the preamble sequence is 251, and the guard bands on both sides of the preamble sequence are 24 and 25, respectively.

 Optionally, as shown in FIG. 4, the subcarrier spacing is preset to 625 Hz, the length of the preamble sequence is 241, and the guard bands on both sides of the preamble sequence are 23 and 24, respectively.

 It should be noted that the resource configuration information received by the user equipment is one or more physical resource block indexes, where each physical resource block index indicates one physical resource block, and the resource configuration information may be randomly selected according to a preset. The number of physical resource blocks occupied by the preamble is specifically configured. For the case where the random access preambles shown in FIG. 2, FIG. 3, and FIG. 4 occupy only one physical resource block, the resource configuration information may be a physical resource block index. And a physical resource block that is used to transmit the random access preamble. The resource configuration information may also be a plurality of physical resource block indexes, indicating that multiple physical resource blocks that can be used to transmit the random access preamble are provided to the user. The device is randomly selected, and the present invention does not limit this.

In addition, the physical resource block index may be used to indicate a resource offset, and the user equipment determines, according to the resource offset, a resource number of a physical resource block used for transmitting a random access preamble. For example, if the number of the initial physical resource block is 0 and the resource offset is 90, the number of the starting physical resource block used to transmit the random access preamble is 90. In this way, for occupying a physics The random access preamble of the resource block, the user equipment transmits the random access preamble by using the physical resource block with the number of 90, and for the random access preamble occupying three physical resource blocks, the user equipment uses the number 90, 91 and 92 three physical resource blocks transmit the random access preamble.

 The preamble sequence provided by the foregoing is only a preferred mode provided by the embodiment of the present invention. In a specific application, the preamble sequence may be set in other manners. For example, when the subcarrier spacing is 5QQHZ, the preamble sequence length is 283; For 600 3⁄4, the length of the preamble sequence is 241, etc. At the same time, the subcarrier spacing can be reduced and the length of the preamble sequence can be shortened so that the preamble sequence occupies two or three physical resource blocks, which is not enumerated here.

 Further, when generating the random access preamble, the user equipment also needs to consider the preamble format of the random access preamble, where the preamble format indicates the time domain duration of the preamble sequence in the random access preamble, and the time of the cyclic prefix. The domain duration is Γ^. The preamble format can also be indicated by the preamble configuration information.

Optionally, the parameter used by the preamble configuration information to generate a random access preamble includes a preamble format index, where the preamble format index corresponds to a set of preamble formats, where the set of preamble formats includes at least two preamble formats, where each The preamble format indicates the time domain duration T _SEQ of the preamble sequence in the random access preamble, and the time domain duration r _{CT of the} cyclic prefix, and the user equipment determines the first preamble format in the set of preamble formats, and generates a match. a random access preamble of the first preamble format, where the first preamble format indicates that the following conditions are met: T _SE0 , N is a positive integer.

 Specifically, the user equipment pre-stores a preamble format of multiple random access preambles, and the user equipment determines a first preamble format according to the preamble format index, and generates a random access preamble that conforms to the first preamble format, and the process thereof Reference may be made to the descriptions corresponding to Tables 3 to 6 in the embodiment of FIG. 1 , and details are not described herein again.

Optionally, the parameter for generating a random access preamble indicated by the preamble configuration information includes a set of preamble format indexes, where the set of preamble format indexes corresponds to a set of preamble formats, where the set of preamble format indexes includes at least two a preamble format index, and each preamble format index corresponds to a preamble format, each preamble format indicating a time domain duration T _SEQ of the preamble sequence in the random access preamble, and a time domain duration Τ _{循环 of the} cyclic prefix, The user equipment determines the first preamble format in the set of preamble formats, And generating a random access preamble conforming to the first preamble format; wherein the first preamble format indicates that the following condition is met: T _SE0 , N is a positive integer.

 Specifically, the user equipment pre-stores a preamble format of multiple random access preambles, and the user equipment determines a first preamble format according to the preamble format index, and generates a random access preamble that conforms to the first preamble format, and the process thereof Reference may be made to the description of Table 7 to Table 10 in the embodiment of FIG. 1 , and details are not described herein again.

 Optionally, when the user equipment determines that the random access fails, the processing unit 62 is further configured to: determine, in the set of preamble formats, a second preamble format, and generate a second random access that conforms to the second preamble format. Deriving, and determining, according to the resource configuration information, a resource for transmitting the second random access preamble; the sending unit 63 is further configured to use the resource to transmit the second random access preamble. Wherein, the second preamble format indicates that 7 meets the following conditions: ―, M is greater than

An integer of N.

The user equipment may determine the random access failure in different manners, which may be preset by the user. For example, the user equipment starts a random access preamble and starts a timer, if the user equipment meets the preset time in the timer. If the feedback information of the network side device is not received, the random access failure is determined; or the user equipment retransmits the random access preamble when the feedback information of the network side device is not received, and The number of retransmissions is counted. When the feedback information of the network side device is not received after retransmission for n times, the random access failure is determined, where n is a positive integer greater than or equal to 1. Due to the 7^ indicated by the second preamble format. Meet the following conditions: T _SEO , M is large

An integer of N indicates that the number of repetitions of the preamble sequence in the second random access preamble is greater than the random access preamble generated by the user equipment according to the first preamble format, so that the user equipment performs the random access preamble with a larger coverage area. Random access, which reduces the number of times of random transmission of the random access sequence, and the user equipment in the prior art repeatedly transmits the random access sequence of the same preamble format to perform random access, and the embodiment of the present invention reduces random access of the user equipment. Waiting time. Optionally, the processing unit 62 is further configured to: before determining the first preamble format in the set of preamble formats, and/or determining the user equipment and the network side before determining the second preamble format in the set of preamble formats. Channel quality information between devices; the processing unit 62 determines a first preamble format in the set of preamble formats, and/or, determining the second preamble format in the set of preamble formats specifically includes, the processing unit 62 is configured according to The channel quality information between the user equipment and the network side device determines a first preamble format; and/or determines a second preamble format according to channel quality information between the user equipment and the network side device.

 Specifically, in the process that the network side device initiates the downlink synchronization to the user equipment, the user equipment may determine the channel quality information between the network side device and the network side device according to the downlink synchronization time, and the user equipment may The preamble format corresponding to the low coverage level index is selected to generate a random access preamble; when the channel quality is poor, the preamble format corresponding to the high coverage level index may be selected to generate a random access preamble. In this way, the embodiment of the present invention improves the success rate of random access of the user equipment by transmitting the random access preamble of the unique preamble format to the network side device.

 In addition, the user equipment may also randomly determine a preamble format corresponding to the preamble format index to generate a random access preamble according to the preamble format index, or may select a preamble format by default, for example, a preamble with a coverage level index of 0 is selected by default. The format generates a random access preamble, which is not limited by the present invention.

 With the foregoing user equipment, the random access preamble transmitted by the user equipment uses a sub-carrier spacing of 1.25K 3⁄4 compared with the prior art, and the sub-carrier spacing is smaller than the frequency bandwidth of the 6 PRB, thereby improving the random access preamble. The power spectral density, while ensuring the detection performance of the random access preamble, achieves the coverage enhancement effect; and the frequency bandwidth of the random access preamble is narrower, which saves the spectrum resource overhead of the random access preamble, thereby improving resource utilization. The embodiment of the present invention provides a network side device 70, which corresponds to the foregoing method embodiment of FIG. 1. Each functional unit of the network side device 70 can be used in the foregoing method steps. As shown in FIG. 7, the network side device 70 includes:

The sending unit 71 is configured to send, to the user equipment, preamble configuration information and resource configuration information, where the preamble configuration information indicates a parameter used to generate a random access preamble, where the resource configuration information indicates a resource that can be used to transmit a random access preamble. The frequency bandwidth of the resource that can be used for transmitting the random access preamble is at least a resource block, Λ '3⁄4 RB is an integer, and one lu≤, RB ^ff ≤3

 The receiving unit 72 is configured to receive the random access preamble transmitted by the user equipment on a resource whose frequency bandwidth is RB physical resource blocks.

The N ^CH physical resource blocks include N^ ^CH subcarriers.

_N RACH is an integer, and Δ/ _{ΚΑ is} the subcarrier spacing of the random access preamble,

And ≤ Δ ^ ≤ 625Hz.

Optionally, the parameter used by the preamble configuration information to generate a random access preamble includes a preamble format index, where the preamble format index corresponds to a set of preamble formats, where the set of preamble formats includes at least two preamble formats, where each The preamble format indicates the time domain duration T _SEQ of the preamble sequence in the random access preamble, and the time domain duration r _{CT of the} cyclic prefix.

 The random access preamble conforms to the first preamble format, and the first preamble format indicates that the following conditions are met: N is a positive integer.

Optionally, the parameter for generating a random access preamble indicated by the preamble configuration information includes a set of preamble format indexes, where the set of preamble format indexes corresponds to a set of preamble formats, where the set of preamble format indexes includes at least two The preamble format index, and each preamble format index corresponds to a preamble format, each preamble format indicating a time domain duration T _SEQ of the preamble sequence in the random access preamble, and a time domain duration 循环^ of the cyclic prefix.

 The random access preamble conforms to the first preamble format, and the first preamble format indicates that the following conditions are met: N is a positive integer.

Optionally, the parameter used by the preamble configuration information to generate a random access preamble includes a root sequence index, where the root sequence index has a value range of: [0, N _ze - 2], and N _ze is less than or equal

180000

The maximum prime number, where f _GI >2> KH _Z optionally, N ^CH Af _RA ^ 500 Hz, ^ = 600 3⁄4, or A/ _RA = 625/ &. Optionally, the resource configuration information is one or more physical resource block indexes, where each physical A resource block index indicates a physical resource block.

 The network side device is used, and the network side device indicates that the random access preamble transmitted by the user equipment is smaller than the frequency bandwidth of the 6PRB, and the subcarrier spacing is smaller than the frequency bandwidth of the 6PRB, thereby improving the subcarrier spacing. Randomly accessing the power spectral density of the preamble, ensuring the detection performance of the random access preamble, and achieving the coverage enhancement effect; and the frequency bandwidth of the random access preamble is narrower, thereby saving the spectrum resource overhead of the random access preamble, thereby improving Resource utilization. An embodiment of the present invention provides a user equipment 80. As shown in FIG. 8, the user equipment 80 includes:

 a processor (Rocessor) 81, a communication interface 82, a memory 83, and a communication bus 84; wherein the processor 81, the communication interface 82, and the memory 83 are completed by the communication bus 84 Communication with each other.

 The processor 81 may be a multi-core CPU, or an Application Specific Integrated Circuit (ASIC), or one or more integrated circuits configured to implement the embodiments of the present invention.

 The memory 83 is for storing program code, and the program code includes computer operation instructions and a network flow diagram. Memory 83 may contain high speed RAM memory and may also include non-volatile memory, such as at least one disk memory. Memory 83 can also be a memory array. The memory 83 may also be partitioned, and the blocks may be combined into a virtual volume according to certain rules.

 The communication interface 82 is configured to implement connection communication between the devices.

 The processor 81 is configured to execute program code in the memory 83 to:

And receiving, by the network side device, preamble configuration information and resource configuration information, where the preamble configuration information indicates a parameter used to generate a random access preamble, where the resource configuration information indicates a resource that can be used to transmit a random access preamble; The frequency bandwidth of the resource that can be used to transmit the random access preamble is at least N _B ^CH physical resource blocks, and N ^H is an integer, and 1 < N^ <3;

 Generating a random access preamble according to the preamble configuration information;

 Determining, according to the resource configuration information, a resource used for transmitting the random access preamble, and transmitting, by using the resource, the random access preamble;

The frequency bandwidth of the resource for transmitting the random access preamble is a physical resource block, and the N ^CH physical resource blocks include N ^H subcarriers.

_N RACH is an integer, and Δ/^ is between the subcarriers of the random access preamble

Separated, and 312.5Hz ≤ Af^ ≤ 625 Hz.

Optionally, the parameter that is used by the preamble configuration information to generate a random access preamble includes a preamble format index, the preamble format index corresponds to a set of preamble formats, and the set of preamble formats includes at least two preamble formats, where Each preamble format indicates a time domain duration T _SEQ of the preamble sequence in the random access preamble, and a time domain duration T _{cp of the} cyclic prefix;

 The generating the random access preamble according to the preamble configuration information specifically includes:

 Determining a first preamble format in the set of preamble formats, and generating a random access preamble conforming to the first preamble format; wherein the first preamble format indicates that the following conditions are met:

Td N is a positive integer. Optionally, the parameter that is used by the preamble configuration information to generate a random access preamble includes a set of preamble format indexes, where the set of preamble format indexes corresponds to a set of preamble formats, where the set of preamble format indexes includes At least two preamble format indexes, and each preamble format index corresponds to one preamble format, each preamble format indicating a time domain duration T _SEQ of the preamble sequence in the random access preamble, and a time domain duration T _{cp of the} cyclic prefix ;

 The generating the random access preamble according to the preamble configuration information specifically includes:

Determining a first preamble format in the set of preamble formats, and generating a random access preamble that conforms to the first preamble format; wherein, the 7 indicated by the first preamble format satisfies the following condition: N is a positive integer. Optionally, when the user equipment determines that the random access fails, the operations further include: Determining a second preamble format in the set of preamble formats, and generating a second random access preamble that conforms to the second preamble format; wherein, the second preamble format indicates that 7 satisfies the following condition: TM is greater than N Integer

 And determining, according to the resource configuration information, a resource used for transmitting the second random access preamble, and transmitting, by using the resource, the second random access preamble.

 Optionally, before determining the first preamble format in the set of preamble formats, and/or before determining the second preamble format in the set of preamble formats, the operations further include:

 Determining channel quality information between the user equipment and the network side device;

 Determining the first preamble format in the set of preamble formats, and/or determining the second preamble format in the set of preamble formats, including:

 Determining a first preamble format according to channel quality information between the user equipment and the network side device; and/or,

Determining a second preamble format according to channel quality information between the user equipment and the network side device. Optionally, the parameter that is used by the preamble configuration information to generate a random access preamble includes a root sequence index, where the value of the root sequence index is: [0, N _ze _ 2], and N _ze is The largest prime number less than or equal to, where f _Gi >2> KH _Z ',

 The generating the random access preamble according to the preamble configuration information specifically includes:

And generating, according to the root sequence index, a root ZC sequence, where the sequence length of the root ZC sequence is N _zc ; and generating a random access preamble according to the root ZC sequence.

Alternatively, N ^CH = \ Af _RA ^ 500 Hz, ^ = 600 3⁄4, or A/ _RA = 625/ &. Optionally, the resource configuration information is one or more physical resource block indexes, where each physical resource block index indicates one physical resource block.

It will be apparent to those skilled in the art that, for convenience and brevity of description, only the division of each functional module described above is exemplified. In practical applications, the above-mentioned function assignment can be completed by different functional modules as needed. The internal structure of the device is divided into different functional modules to perform all or part of the functions described above. For the specific working process of the system, device and unit described above, reference may be made to the corresponding process in the foregoing method embodiment. I will not repeat them here. The network side device 90 is provided in the embodiment of the present invention. As shown in FIG. 9, the network side device 90 includes:

 a processor (Rocessor) 91, a communication interface 92, a memory 93, and a communication bus 94; wherein the processor 91, the communication interface 92, and the memory 93 are completed by the communication bus 94 Communication with each other.

 The processor 91 may be a multi-core CPU, or an Application Specific Integrated Circuit (ASIC), or one or more integrated circuits configured to implement the embodiments of the present invention.

 The memory 93 is for storing program code, and the program code includes computer operation instructions and a network flow diagram. Memory 93 may contain high speed RAM memory and may also include non-volatile memory, such as at least one disk memory. Memory 93 can also be a memory array. The memory 93 may also be partitioned, and the blocks may be combined into a virtual volume according to certain rules.

 The communication interface 92 is configured to implement connection communication between the devices.

 The processor 91 is configured to execute program code in the memory 93 to:

Transmitting, by the user equipment, preamble configuration information and resource configuration information, where the preamble configuration information indicates a parameter used to generate a random access preamble, where the resource configuration information indicates a resource that can be used to transmit a random access preamble; The frequency bandwidth of the resource used for transmitting the random access preamble is at least one physical resource block, and N^ ^OT is an integer, 3A≤N ^CH ≤? > ·,

Receiving, by the user equipment, the random access preamble transmitted on a resource whose frequency bandwidth is N ^CH physical resource blocks;

Wherein, the physical resource blocks ^Ν Η comprising N sub-carriers,

_N RACH _N ^fH is an integer, ^ ^ is between the subcarriers of the random access preamble

Separated, and 312.5Hz ≤ Af^ ≤ 625 Hz.

Optionally, the parameter used by the preamble configuration information to generate a random access preamble includes a preamble a format index, where the preamble format index corresponds to a set of preamble formats, where the set of preamble formats includes at least two preamble formats, where each preamble format indicates a time domain duration T _SEQ of the preamble sequence in the random access preamble, And the time domain duration of the cyclic prefix T _cp

 The random access preamble conforms to the first preamble format, and the first preamble format indicates that the following conditions are met: Γ_N is a positive integer.

Optionally, the parameter that is used by the preamble configuration information to generate a random access preamble includes a set of preamble format indexes, where the set of preamble format indexes corresponds to a set of preamble formats, where the set of preamble format indexes includes At least two preamble format indexes, and each preamble format index corresponds to one preamble format, each preamble format indicating a time domain duration of the preamble sequence in the random access preamble, and a time domain duration T _{cp of the} cyclic prefix;

 The random access preamble conforms to the first preamble format, and the first preamble format indicates that the following conditions are met: Γ_N is a positive integer.

Optionally, the parameter that is used by the preamble configuration information to generate a random access preamble includes a root sequence index, where the value of the root sequence index is: [0, N _ze _ 2], and N _ze is Is the largest prime number less than or equal to x N - , where f _GI ≥ KH _Z .

Alternatively, N ^CH = ', Af _RA ^ 500 Hz, ^ = 600 3⁄4, or A/ _RA = 625/ &. Optionally, the resource configuration information is one or more physical resource block indexes, where each physical resource block index indicates one physical resource block.

 It will be apparent to those skilled in the art that, for convenience and brevity of description, only the division of each functional module described above is exemplified. In practical applications, the above-mentioned function assignment can be completed by different functional modules as needed. The internal structure of the device is divided into different functional modules to perform all or part of the functions described above. For the specific working process of the system, the device and the unit described above, refer to the corresponding process in the foregoing method embodiment, and details are not described herein again.

The above is only a specific embodiment of the present invention, but the scope of the present invention is not limited thereto, and any person skilled in the art is within the technical scope of the present disclosure. Variations or substitutions that are readily conceivable are intended to be covered by the scope of the invention. Therefore, the scope of the invention should be determined by the scope of the claims.

Claims

Claim  A user equipment, the user equipment comprising: a receiving unit, configured to receive preamble configuration information and resource configuration information sent by the network side device, where the preamble configuration information indicates a parameter used to generate a random access preamble, where the resource configuration information indication can be used to transmit a random access preamble The resource bandwidth of the resource that can be used to transmit the random access preamble is at least one physical resource block, ^ is an integer, and 1 ≤ ^CH ≤ 3; the processing unit is configured to receive according to the receiving unit Preamble configuration information, generating a random access preamble;  Determining, according to the resource configuration information received by the receiving unit, a resource used for transmitting the random access preamble;  a sending unit, configured to transmit the random access preamble by using the resource; The frequency bandwidth of the resource used for transmitting the random access preamble is N^ ^OT physical resource blocks, and the physical resource blocks include N ^OT subcarriers, _Ν = ,

N^ ^CH is an integer, and Δ/^ is the subcarrier spacing of the random access preamble, and 312.5 3⁄4 _≤ Δ ΚΑ _≤ 625 Ηζ .  2. The user equipment according to claim 1, wherein: The preamble format index includes a preamble format index, the preamble format index corresponds to a set of preamble formats, and the set of preamble formats includes at least two preamble formats, where each preamble is used by the preamble configuration information. The format indicates the time domain duration T _SEQ of the preamble sequence in the random access preamble, and the time domain duration r _{CT of the} cyclic prefix;  The processing unit generates a random access preamble according to the preamble configuration information received by the receiving unit, and includes:  Determining, in the set of preamble formats, a first preamble format, and generating a random access preamble that conforms to the first preamble format; where the first preamble format indicates that the following conditions are met: N is a positive integer. 3. The user equipment according to claim 1, wherein: The parameter for generating a random access preamble indicated by the preamble configuration information includes a set of preambles The index of the set of preamble formats corresponds to a set of preamble formats, wherein the set of preamble format indexes includes at least two preamble format indexes, and each preamble format index corresponds to one preamble format, and each preamble format indication The time domain duration T _SEQ of the preamble sequence in the random access preamble, and the time domain duration of the cyclic prefix Γ^;  The processing unit generates a random access preamble according to the preamble configuration information received by the receiving unit, and includes:  The first preamble format is determined in the set of preamble formats, and a random access preamble corresponding to the first preamble format is generated. The first preamble format indicates that the following condition is met: N is a positive integer. The user equipment according to claim 2 or 3, wherein, when the user equipment determines that the random access fails, the processing unit is further configured to:  Determining a second preamble format in the set of preamble formats, and generating a second random access preamble that conforms to the second preamble format; wherein the second preamble format indication 7 satisfies the following conditions: T M is an integer greater than N;

 And determining, according to the resource configuration information, a resource used for transmitting the second random access preamble; the sending unit is further configured to: use the resource to transmit the second random access preamble.  The user equipment according to any one of claims 2 to 4, wherein the processing unit is further configured to: before determining the first preamble format in the set of preamble formats, and/or Before determining the second preamble format in a set of preamble formats,  Determining channel quality information between the user equipment and the network side device;  The processing unit determines a first preamble format in the set of preamble formats, and/or, the determining the second preamble format in the set of preamble formats, including:  Determining a first preamble format according to channel quality information between the user equipment and the network side device; and/or,  Determining a second preamble format according to channel quality information between the user equipment and the network side device. 6. The user equipment according to any one of claims 1 to 5, characterized in that: The parameter for generating a random access preamble indicated by the preamble configuration information includes a root sequence index, The root sequence index has a value range of: [0, N _ze -2] , and N _ze is a maximum prime number less than or equal to, where f _GI >KHz',

 The processing unit generates a random access preamble according to the preamble configuration information received by the receiving unit, and includes: And generating, according to the root sequence index, a root ZC sequence, where the sequence length of the root ZC sequence is N _zc ; and generating a random access preamble according to the root ZC sequence.  The user equipment according to any one of claims 1 to 6, characterized in that: N^ ^CH = 1; Δ/ _ΚΑ =500 _3⁄4 , Δ/ _ΚΑ =600 _3⁄4 , or Δ/ _ΚΑ = 625/ &.  8. The user equipment according to claim 7, wherein:  The resource configuration information is one or more physical resource block indexes, wherein each physical resource block index indicates one physical resource block. A network side device, where the network side device includes: a sending unit, configured to send, to the user equipment, preamble configuration information, where the resource configuration information indicates a parameter that is used to generate a random access preamble, where the resource configuration information indicates a resource that can be used to transmit a random access preamble; wherein the random access preamble can be used to transmit a frequency bandwidth of at least one physical resource blocks ^, N ^ ^OT is an integer and i≤ ^CH ≤3; a receiving unit, configured to receive, by the user equipment, the random access preamble transmitted on a resource whose frequency bandwidth is N^ ^OT physical resource blocks; Wherein said ^Ν Η physical resource blocks comprises N ^CH subcarriers, _N RACH is an integer, which is between the subcarriers of the random access preamble

Separated, and 312.5Hz ≤ Af^ ≤ 625 Hz.  10. The network side device according to claim 9, wherein: The preamble format index includes a preamble format index, the preamble format index corresponds to a set of preamble formats, and the set of preamble formats includes at least two preamble formats, where each preamble is used by the preamble configuration information. The format indicates the time domain duration of the preamble sequence in the random access preamble T _SEQ , and the time domain duration r _{CT of the} cyclic prefix;  The random access preamble conforms to a first preamble format, and the first preamble format indicates 7^. The following conditions are met: Γ_ N is a positive integer.

 11. The network side device according to claim 9, wherein: The parameter for generating a random access preamble indicated by the preamble configuration information includes a set of preamble format indexes, where the set of preamble format indexes corresponds to a set of preamble formats, where the set of preamble format indexes includes at least two preambles. a format index, and each preamble format index corresponds to a preamble format, each preamble format indicating a time domain duration T _SEQ of the preamble sequence in the random access preamble, and a time domain duration of the cyclic prefix Γ^; The random access preamble is consistent with the first preamble format, and the first preamble format indicates. The following conditions are met: T _SE0 , N is a positive integer.

The network side device according to any one of claims 9 to 11, wherein the parameter for generating a random access preamble indicated by the preamble configuration information includes a root sequence index, where the root sequence index The range of values is: [0, N _ze _ 2] , N _ze is the largest prime number less than or equal to χ _{Ν Η} -, where f _{Gi ≥} ^ _KHz .

The network side device according to any one of claims 9 to 12, characterized in that: N^ ^CH = 1; Δ / _ΚΑ = 500 _3⁄4 , Δ / _ΚΑ = 600 _3⁄4 , or Δ / _ΚΑ = 625 / & .  14. The network side device according to claim 13, wherein:  The resource configuration information is one or more physical resource block indexes, wherein each physical resource block index indicates one physical resource block. A method for transmitting a random access preamble, the random access preamble includes a preamble sequence and a cyclic prefix, and the user equipment transmits the random access preamble to initiate random access, wherein the method includes: Receiving, by the network side device, preamble configuration information and resource configuration information, where the preamble configuration information indicates a parameter used to generate a random access preamble, and the resource configuration information indication can be used to transmit a random Resource access preamble; wherein the random access preamble can be used to transmit a frequency bandwidth of at least one physical resource blocks ^, N ^ ^OT is an integer and i≤ ^CH ≤3;  Generating a random access preamble according to the preamble configuration information;  Determining, according to the resource configuration information, a resource for transmitting the random access preamble, and transmitting, by using the resource, the random access preamble; Wherein the means for transmitting the random access preamble frequency bandwidth of N ^ ^OT physical resource blocks, the physical resource blocks ^Ν Η ^Ν Η comprising subcarriers, _N RACH ^ is an integer, and Δ/^ is between the subcarriers of the random access preamble

Separated, and 312.5Hz ≤ Af^ ≤ 625 Hz.  16. The method of claim 15 wherein: The preamble format index includes a preamble format index, the preamble format index corresponds to a set of preamble formats, and the set of preamble formats includes at least two preamble formats, where each preamble is used by the preamble configuration information. The format indicates the time domain duration T _SEQ of the preamble sequence in the random access preamble, and the time domain duration r _{CT of the} cyclic prefix;  Generating a random access preamble according to the preamble configuration information, including:  Determining a first preamble format in the set of preamble formats, and generating a random access preamble that conforms to the first preamble format; wherein the first preamble format indicates that 7 meets the following conditions: N is a positive integer. 17. The method of claim 15 wherein: The parameter for generating a random access preamble indicated by the preamble configuration information includes a set of preamble format indexes, where the set of preamble format indexes corresponds to a set of preamble formats, where the set of preamble format indexes includes at least two preambles. a format index, and each preamble format index corresponds to a preamble format, each preamble format indicating a time domain duration T _SEQ of the preamble sequence in the random access preamble, and a time domain duration of the cyclic prefix Γ^;  Generating a random access preamble according to the preamble configuration information, including: Determining a first preamble format in the set of preamble formats and generating a conformance to the first preamble format a random access preamble; wherein the first preamble format indicates that the following condition is satisfied: N is a positive integer. The method according to claim 16 or 17, wherein, when the user equipment determines that the random access fails, the method further includes:  Determining a second preamble format in the set of preamble formats, and generating a second random access preamble that conforms to the second preamble format; wherein the second preamble format indication 7 satisfies the following conditions: T M is an integer greater than N;

 And determining, according to the resource configuration information, a resource for transmitting the second random access preamble, and transmitting, by using the resource, the second random access preamble.  The method according to any one of claims 16 to 18, wherein before determining the first preamble format in the set of preamble formats, and/or determining the second in the set of preamble formats Before the preamble format, the method further includes:  Determining channel quality information between the user equipment and the network side device;  Determining the first preamble format in the set of preamble formats, and/or determining the second preamble format in the set of preamble formats, including:  Determining a first preamble format according to channel quality information between the user equipment and the network side device; and/or,  Determining a second preamble format according to channel quality information between the user equipment and the network side device. 20. A method according to any one of claims 15 to 19, characterized by: The parameter for generating a random access preamble indicated by the preamble configuration information includes a root sequence index, where the value of the root sequence index is: [0, N - 2], and N _ze is less than or equal to ',

 Generating a random access preamble according to the preamble configuration information, including: And generating, according to the root sequence index, a root ZC sequence, where the sequence length of the root ZC sequence is N _zc ; and generating a random access preamble according to the root ZC sequence. 21. A method according to any one of claims 15 to 20, characterized by: N^ ^CH = 1; Δ / _ΚΑ = 500 _3⁄4 , Δ / _ΚΑ = 600 _3⁄4 , or Δ / _ΚΑ = 625/ &.  22. The method of claim 21, wherein:  The resource configuration information is one or more physical resource block indexes, wherein each physical resource block index indicates one physical resource block. A method for transmitting a random access preamble, the random access preamble includes a preamble sequence and a cyclic prefix, and the user equipment transmits the random access preamble to initiate random access, wherein the method includes:  Transmitting, by the user equipment, preamble configuration information and resource configuration information, where the preamble configuration information indicates a parameter used to generate a random access preamble, where the resource configuration information indicates a resource that can be used to transmit a random access preamble; The frequency bandwidth of the resource used for transmitting the random access preamble is at least ^ physical resource block, ^ is an integer, and 1≤Λ^^≤3; Receiving, by the user equipment, the random access preamble transmitted on a resource whose frequency bandwidth is N^ ^OT physical resource blocks; Wherein said ^Ν Η physical resource blocks comprises N ^CH subcarriers, _N RACH ^ is an integer, and Δ/^ is between the subcarriers of the random access preamble

Separated, and 312.5Hz ≤ Af^ ≤ 625 Hz.  24. The method of claim 23, wherein: The preamble format index includes a preamble format index, the preamble format index corresponds to a set of preamble formats, and the set of preamble formats includes at least two preamble formats, where each preamble is used by the preamble configuration information. The format indicates the time domain duration T _SEQ of the preamble sequence in the random access preamble, and the time domain duration r _{CT of the} cyclic prefix;  The random access preamble conforms to the first preamble format, and the first preamble format indicates that the following conditions are met: Γ_N is a positive integer.

 25. The method of claim 23, wherein: The parameter for generating a random access preamble indicated by the preamble configuration information includes a set of preamble format indexes, and the set of preamble format indexes corresponds to a set of preamble formats, where the set of preamble formats The index includes at least two preamble format indexes, and each preamble format index corresponds to one preamble format, each preamble format indicating a time domain duration T _SEQ of the preamble sequence in the random access preamble, and a time domain duration of the cyclic prefix Γ^;  The random access preamble conforms to a first preamble format, and the first preamble format indicates 7^. The following conditions are satisfied: N is a positive integer.

The method according to any one of claims 23 to 25, wherein the parameter for generating a random access preamble indicated by the preamble configuration information comprises a root sequence index, wherein the root sequence index is taken The range of values is: [0,N _ZC _2], N _zc is less than or equal to

The largest prime number, where f _G1 >l> KH _Z .  27. A method according to any one of claims 23 to 26, characterized by: N^ ^CH = 1; Δ/ _ΚΑ =500 _3⁄4 , Δ/ _ΚΑ =600 _3⁄4 , or Δ/ _ΚΑ = 625/ &.  28. The method of claim 27, wherein:  The resource configuration information is one or more physical resource block indexes, wherein each physical resource block index indicates one physical resource block.