CN115643645A

CN115643645A - Frequency domain offset parameter determination method, user equipment and computer readable medium

Info

Publication number: CN115643645A
Application number: CN202211269632.9A
Authority: CN
Inventors: 钱辰; 熊琦; 喻斌
Original assignee: Samsung Electronics Co Ltd
Current assignee: Samsung Electronics Co Ltd
Priority date: 2018-01-19
Filing date: 2018-01-19
Publication date: 2023-01-24
Also published as: CN110062472A; CN110062472B

Abstract

The embodiment of the present disclosure discloses a method for determining a frequency domain offset parameter of a preamble sequence in a random access channel, which includes: obtaining random access channel subcarrier spacing delta f from base station _RA Leader sequence length L _RA And an uplink channel subcarrier spacing Δ f; and according to the obtained random access channel subcarrier spacing delta f _RA Length of leader sequence L _RA And the subcarrier interval delta f of the uplink channel, and determining the frequency domain offset parameter of the leader sequence in the random access channel

Embodiments of the disclosure also disclose a corresponding UE, and a corresponding computer-readable medium.

Description

Frequency domain offset parameter determination method, user equipment and computer readable medium

The application is a divisional application of a Chinese patent application with the application number of 201810057947.4, the application date of which is 1, 19 and 2018.

Technical Field

The present application relates to the field of wireless communication technologies, and in particular, to a method for determining a frequency domain offset parameter of a preamble sequence in a random access channel, and a corresponding user equipment and a computer readable medium.

Background

With the rapid development of the information industry, particularly the growing demand from the mobile Internet and the Internet of Things (IoT), unprecedented challenges are brought to future mobile communication technologies. According to the International Telecommunication Union (International Telecommunication Union, ITU) report ITU-R M. [ imt. Beyond 2020.Traffic ], it can be expected that the mobile traffic will increase nearly 1000 times in 2020 compared to 2010 (era 4G), the number of User Equipment (UE) connections will also exceed 170 billion, and the number of connected devices will be more dramatic as a huge number of IoT devices gradually penetrate into the mobile communication network. To meet the unprecedented challenge, the communication industry and academia have developed a wide fifth generation of mobile communication technology research (5G) facing the 2020. Future 5G frameworks and overall goals are currently discussed in ITU's report ITU-R M. [ imt.vision ], where the 5G demand landscape, application scenarios and various important performance indicators are specified. For the new requirements in 5G, ITU's report ITU-R M [ imt. Use TECHNOLOGY trend trees ] provides information related to the technical trend of 5G, and aims to solve the significant problems of significant improvement of system throughput, consistency of user experience, and extensibility to support IoT, delay, energy efficiency, cost, network flexibility, support of emerging services, flexible spectrum utilization, and the like.

The Random Access (Random Access) process is an important means for UE Access. After the UE completes downlink synchronization through the downlink synchronization signal, it needs to perform a random access procedure to complete registration in the cell, acquire an uplink timing advance command, and complete uplink synchronization. The UE is divided into a Contention-based Random Access (Contention-based Random Access) and a non-Contention-based Random Access (Contention-free Random Access) according to whether the UE has an exclusive use of the preamble sequence resource. In contention-based random access, in the process of trying to establish uplink, each UE selects a preamble sequence from the same preamble sequence resource, and it may happen that a plurality of UEs select the same preamble sequence to send to a base station, so a collision resolution mechanism is an important research direction in random access, how to reduce collision probability and how to quickly resolve an occurred collision, and is a key index affecting random access performance.

The contention-based random access procedure in LTE-a is divided into four steps, as shown in fig. 1. Before the random access process is started, the base station sends the configuration information of the random access process to the UE, and the UE carries out the random access process according to the received configuration information.

In step 1, the UE randomly selects a preamble sequence from a preamble sequence resource pool and sends the preamble sequence to the base station, and the base station performs correlation detection on a received signal, thereby identifying the preamble sequence sent by the UE;

in step 2, the base station sends a Random Access Response (RAR) to the UE, including a Random Access preamble sequence Identifier, a timing advance command determined according to the time delay estimation between the UE and the base station, a Temporary Cell Radio Network Temporary Identifier (TC-RNTI), and a time-frequency resource allocated for the next uplink transmission of the UE;

in step 3, the UE sends a message three (abbreviated as MSg 3) to the base station according to the information in the RAR, where the MSg3 includes information for UE identity and RRC connection request, where the UE identity is unique to the UE and is used to resolve a collision;

in step 4, the base station sends a conflict resolution Identifier to the UE, which includes the UE Identifier that is the winner in the conflict resolution, after detecting the Identifier of the UE, the UE upgrades the Temporary Cell Radio Network Temporary Identifier to a Cell Radio Network Temporary Identifier (C-RNTI), and sends an Acknowledgement Character (ACK) signal to the base station, completes the random access process, and waits for the scheduling of the base station, otherwise, the UE starts a new random access process after a delay.

For the non-contention based random access procedure, since the base station knows the UE identity and can allocate a preamble sequence to the UE, the UE does not need to randomly select a sequence when sending the preamble sequence, but uses the allocated preamble sequence. After detecting the allocated preamble sequence, the base station sends a corresponding random access response, including information such as timing advance and uplink resource allocation. And after receiving the random access response, the UE considers that the uplink synchronization is finished and waits for further scheduling of the base station. Thus, the initial access and non-contention based random access procedures only comprise two steps: step one, a leader sequence is sent; and step two, sending the random access response.

The first step in initiating random access, whether contention-based or non-contention-based, is to send a preamble sequence on a random access channel. In LTE, the baseband signal generation formula is as follows:

in the above formula, beta _PRACH For amplitude adjustment factors calculated by the power control process, N _ZC Is the sequence length, x _u，v (n) is a preamble sequence, K is a factor for adjusting a difference between subcarrier spacings of a random access channel and an uplink channel, and Δ f _RA Subcarrier spacing, k, for random access channels ₀ For the parameter for adjusting the frequency domain position of the random access channel, T _CP Is the cyclic prefix length. Parameter(s)

For adjusting the frequency domain position of the random access preamble sequence to make it have the same bandwidth from the uplink shared channel at both ends (alsoI.e., the guard intervals at both ends of the preamble sequence are the same), the specific values are shown in table 1.

Table 1: parameter(s)

Value of

It can be seen that this parameter is directly related to the random access channel subcarrier spacing.

For a 5G system, the subcarrier spacing supported by the system and the subcarrier spacing supported by the random access channel are more diverse. Specifically, the subcarrier spacing supported by the upstream includes 15/30/60/120kHz, and the subcarrier spacing of the random access channel includes 1.25/5/15/30/60/120kHz. The combination of multiple uplink channel and random access channel subcarrier spacing results in more complex adjustments to the preamble sequence position.

In the existing 5G technology, the subcarrier spacing supported by the uplink and the subcarrier spacing supported by the random access channel are more diversified, and a single or a few parameters for adjusting the frequency domain position of the preamble sequence cannot satisfy all possible subcarrier spacing combinations.

Disclosure of Invention

The technical problem that the present disclosure is intended to solve is that a scheme for adjusting parameters of a preamble sequence at a frequency domain position in the prior art cannot satisfy multiple possible uplink shared channel subcarrier intervals and random access channel subcarrier intervals in 5G. To solve this problem, the present disclosure proposes a scheme for determining a frequency domain offset parameter of a preamble sequence in a random access channel, which can be applied to various combinations of subcarrier spacings.

According to an aspect of the present disclosure, there is provided a method for determining a frequency domain offset parameter of a preamble sequence in a random access channel, including: obtaining random access channel subcarrier spacing delta f from base station _RA Length of leader sequence L _RA And uplink channel subcarrier spacingΔ f; and according to the obtained random access channel subcarrier spacing delta f _RA Leader sequence length L _RA And the sub-carrier spacing delta f of the uplink channel, and determining the frequency domain offset parameter of the leader sequence in the random access channel

According to another aspect of the present disclosure, there is provided a UE, including:

a processor; and

a memory storing computer-executable instructions that, when executed by the processor, cause the processor to: obtaining random access channel subcarrier spacing delta f from base station _RA Length of leader sequence L _RA And an uplink channel subcarrier spacing Δ f; and according to the acquired random access channel subcarrier spacing delta f _RA Length of leader sequence L _RA And the sub-carrier spacing delta f of the uplink channel, and determining the frequency domain offset parameter of the leader sequence in the random access channel

In an exemplary embodiment, a frequency domain offset parameter of a preamble sequence in a random access channel is determined

Further comprising: calculating the frequency domain offset parameter of the leader sequence in the random access channel according to the following formula

Wherein N is _u Denotes the number of sub-carriers used as guard bands within the random access channel, symbol [ ·]Indicating a rounding operation.

In an exemplary embodiment, the preamble sequence is determined atFrequency domain offset parameters in random access channels

Wherein, N _u Denotes the number of sub-carriers used as guard bands in the random access channel, symbol [ · ]]Indicating a rounding operation.

In one exemplary embodiment of the present invention,

wherein

Number of physical resource blocks of random access channel for subcarrier interval delta f of each uplink channel

(symbol)

For a ceiling rounding operation, where N _SC The number of subcarriers of one physical resource block.

In an exemplary embodiment, N is obtained according to the following correspondence table _u ：

Further comprising: determining frequency domain offset parameter of preamble sequence in random access channel according to one of the following correspondence tables

According to another aspect of the present disclosure, there is provided a computer readable medium having stored thereon instructions, which, when executed by a processor, cause the processor to perform the method as described above.

Drawings

Fig. 1 schematically illustrates a conventional contention-based random access procedure;

fig. 2 schematically shows a flowchart of a method performed at the UE side for determining a frequency domain offset parameter of a preamble sequence in a random access channel according to an exemplary embodiment of the present disclosure;

fig. 3 schematically shows a random access channel guard band diagram;

FIG. 4 schematically illustrates another random access channel guard band diagram;

fig. 5 schematically shows a structural diagram of a UE according to an exemplary embodiment of the present disclosure.

FIG. 6 illustrates a DFT-based baseband signal generation scheme;

FIG. 7 shows an improved preamble sequence baseband signal generation;

fig. 8 is another way of generating a baseband signal.

Detailed Description

Reference will now be made in detail to the embodiments of the present disclosure, examples of which are illustrated in the accompanying drawings, wherein like or similar reference numerals refer to the same or similar elements or elements having the same or similar functions throughout. The embodiments described below with reference to the drawings are exemplary only for the purpose of illustrating the present disclosure and should not be construed as limiting the same.

As used herein, the singular forms "a", "an", "the" and "the" are intended to include the plural forms as well, unless the context clearly indicates otherwise. It will be further understood that the terms "comprises" and/or "comprising," when used in this specification, specify the presence of stated features, integers, steps, operations, elements, and/or components, but do not preclude the presence or addition of one or more other features, integers, steps, operations, elements, components, and/or groups thereof. It will be understood that when an element is referred to as being "connected" or "coupled" to another element, it can be directly connected or coupled to the other element or intervening elements may also be present. Further, "connected" or "coupled" as used herein may include wirelessly connected or wirelessly coupled. As used herein, the term "and/or" includes all or any element and all combinations of one or more of the associated listed items.

It will be understood by those within the art that, unless otherwise defined, all terms (including technical and scientific terms) used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this disclosure belongs. It will be further understood that terms, such as those defined in commonly used dictionaries, should be interpreted as having a meaning that is consistent with their meaning in the context of the prior art and will not be interpreted in an idealized or overly formal sense unless expressly so defined herein.

As will be appreciated by those skilled in the art, "UE" and "terminal" as used herein include both devices having a wireless signal receiver, which are devices having only a wireless signal receiver without transmit capability, and devices having receive and transmit hardware, which have devices having receive and transmit hardware capable of two-way communication over a two-way communication link. Such a device may include: a cellular or other communications device having a single line display or a multi-line display or a cellular or other communications device without a multi-line display; PCS (PerSonal CommunicationS Service), which may combine voice, data processing, facsimile and/or data communication capabilities; a PDA (PerSonal Digital ASSiStant), which may include a radio frequency receiver, a pager, internet/intranet access, web browser, notepad, calendar and/or GPS (Global PoSitioning SyStem) receiver; a conventional laptop and/or palmtop computer or other device having and/or including a radio frequency receiver. As used herein, a "UE" or "terminal" may be portable, transportable, installed in a vehicle (aeronautical, maritime, and/or land-based), or situated and/or configured to operate locally and/or in a distributed fashion at any other location(s) on earth and/or in space. As used herein, the "UE" and "terminal" may also be a communication terminal, a web-enabled terminal, and a music/video playing terminal, such as a PDA, an MID (Mobile Internet Device) and/or a Mobile phone with music/video playing function, and may also be a smart tv, a set-top box, and the like. In addition, "UE" and "terminal" may be replaced with "user" and "user equipment".

In order to solve the problem that a parameter for adjusting a preamble sequence in a frequency domain position in the prior art cannot satisfy multiple possible uplink shared channel subcarrier intervals and random access channel subcarrier intervals in 5G, an embodiment of the present disclosure provides a method performed at a UE for generating a baseband signal, including:

reading random access configuration information from a base station, wherein the random access configuration information comprises random access channel configuration information, leader sequence configuration information and the like;

acquiring a random access channel subcarrier interval from the random access channel configuration information, and acquiring preamble sequence length information from the preamble sequence configuration information; acquiring the uplink channel subcarrier spacing from other System Information (e.g., minimum Remaining System Information, RMSI) sent by the base station;

determining frequency domain offset parameters of the leader sequence in the random access channel according to the acquired random access channel subcarrier interval, the uplink channel subcarrier interval and the leader sequence length; and

and generating a baseband signal according to the determined frequency domain offset parameter of the preamble sequence in the random access channel.

Specifically, a baseband signal is generated according to equation (1):

K＝Δf/Δf _RA (1)

wherein the parameter L _RA Is the length of the preamble sequence, k ₀ For adjusting the parameter of the random access channel position, Δ f is the uplink data channel or the uplink channel subcarrier interval of the initial access, Δ f _RA For random access to the channel sub-carrier spacing,

is the cyclic prefix length, T, of the preamble sequence _c In order to be the sampling interval between samples,

is a parameter for adjusting the position of the preamble sequence in the random access channel, i.e. the frequency domain offset parameter of the preamble sequence in the random access channel herein.

Thus, the focus of the present disclosure is on the frequency domain offset parameter of the preamble sequence in the random access channel

And (4) determining.

A flowchart of a method performed at a UE for determining a frequency domain offset parameter of a preamble sequence in a random access channel according to an exemplary embodiment of the present disclosure will be described in detail below with reference to fig. 2.

Fig. 2 schematically shows a flowchart of a method 200 performed at a UE for determining a frequency domain offset parameter of a preamble sequence in a random access channel according to an exemplary embodiment of the present disclosure. As shown in fig. 2, method 200 may include step 201 and step 202.

In step 201, the UE may acquire a random access channel subcarrier spacing Δ f from the base station _RA Length of leader sequence L _RA And an uplink channel subcarrier spacing Δ f.

In step 202, the UE may obtain a random access channel subcarrier spacing Δ f according to the obtained random access channel subcarrier spacing Δ f _RA Length of leader sequence L _RA And the subcarrier interval delta f of the uplink channel, and determining the frequency domain offset parameter of the leader sequence in the random access channel

Frequency domain offset parameter of preamble sequence in random access channel

May be obtained by calculation or may be obtained by finding a predefined random access channel subcarrier spacing Δ f _RA Length of leader sequence L _RA And frequency domain offset parameter of uplink channel subcarrier spacing delta f and leader sequence in random access channel

The corresponding relation table of (2) is obtained.

Herein, unless otherwise indicated, "uplink channel" refers to an uplink data channel, such as a Physical Uplink Shared Channel (PUSCH).

Obtaining the frequency domain offset parameter of the preamble sequence in the random access channel by calculation

In the embodiment of (2), the subcarrier spacing Δ f may be obtained according to the random access channel acquired from the base station _RA Leader sequence length L _RA Calculating frequency domain offset parameter of leader sequence in random access channel according to uplink channel subcarrier spacing delta f

This embodiment of the present disclosure provides several implementations as follows.

Implementation mode one

In this embodiment, the frequency domain offset parameter of the preamble sequence in the random access channel is calculated

When taking the value of (3), it needs to ensure that the guard bandwidths between the subcarriers of the transmission data closest to both ends of the preamble sequence are consistent.

As shown in fig. 3, pass parameterKk ₀ The first subcarrier of the random access channel is overlapped with the subcarrier of the uplink channel, so that the distance between the first subcarrier of the random access channel and the last subcarrier of the adjacent uplink channel is the subcarrier interval of the uplink channel.

It can be seen that, when the guard band of the first subcarrier of the preamble sequence close to the uplink channel is calculated, the subcarrier width of an uplink channel needs to be calculated in addition to the guard band inside the random access channel. When the distance between the last subcarrier of the preamble sequence and the guard band of the adjacent uplink channel is calculated, the subcarrier interval of one random access channel needs to be calculated.

Specifically, assume that the subcarrier spacing through the uplink channel and the subcarrier spacing Δ f of the random access channel _RA And the length of the leader sequence L _RA The number of subcarriers used as guard bands in the random access channel can be obtained and is marked as N _u When calculating the bandwidth distance of the uplink channel sub-carrier adjacent to the sub-carrier distance at the two ends of the preamble sequence, the bandwidth BW _g Is (N) _u +1)Δf _RA + Δ f, where N _u +1 considers the subcarrier used as the guard band in the random access channel and the subcarrier interval between the last subcarrier of the random access channel and the adjacent uplink channel, wherein the subcarrier interval is the subcarrier interval of the random access channel; and delta f is the interval of uplink channel subcarriers and is used for calculating the bandwidth of the guard band when the distance of the first subcarrier of the leader sequence from the adjacent uplink channel subcarrier is calculated. While

The number of the random access channel sub-carriers in the guard band of the first sub-carrier close to the last sub-carrier of the uplink channel from the first sub-carrier of the first leader sequence is shown. This parameter can be calculated as follows:

firstly, calculating the bandwidths of data subcarriers at two ends of a random access leader sequence distance as follows:

BW _g ＝(N _u +1)Δf _RA +Δf

the bandwidth of the one-sided guard band can then be obtained:

BW _h ＝BW _g /2

according to the subcarrier width of the uplink channel, the number of subcarriers in the random access channel at the front side can be obtained as follows:

where the symbol [ · ] represents a round-up operation, which can be replaced with a round-up or round-down symbol.

To sum up, the parameters

Can be calculated by the following formula:

where the symbol [ - ] represents a round operation, which can be replaced with a round-up or round-down symbol.

Second embodiment

In this embodiment, when calculating the subcarrier spacing in the random access channel, the distance between the last subcarrier in the random access channel and the adjacent uplink channel is not calculated, that is, when calculating the guard band between the last subcarrier of the preamble sequence and the subcarrier of the adjacent uplink channel, only the number of subcarriers in the random access channel is calculated. At this time, the parameters

The calculation is as follows.

BW _g ＝N _u Δf _RA +Δf

the bandwidth of the one-sided guard band can then be obtained:

BW _h ＝BW _g /2

wherein the symbol [ · ] represents a rounding operation. The rounding operation may be replaced with a ceiling or floor sign.

To sum up, the parameters

Can be calculated by the following formula:

Third embodiment

In this embodiment, only the number of subcarriers in the random access channel is considered, and the number of subcarriers on both sides of the random access preamble sequence is made approximately equal, as shown in fig. 4.

In this case, the number of subcarriers for guard bands before the first subcarrier of the preamble sequence is greater

The following can be calculated:

Although the present disclosure provides only the above three embodiments as parameters for calculating the frequency domain offset of the preamble sequence in the random access channel

But the present disclosure is not limited thereto, and others are used for the subcarrier spacing Δ f according to the random access channel _RA Length of leader sequence L _RA Calculating frequency domain offset parameter of preamble sequence in random access channel according to uplink channel subcarrier spacing delta f

Also fall within the scope of the present disclosure.

In the above calculation procedure, N _u The number of sub-carriers used for guard band in the random access channel can be determined by searching the pre-defined random access channel sub-carrier spacing Δ f _RA Length of leader sequence L _RA And the uplink channel subcarrier spacing delta f and N _u Or according to the random access channel subcarrier spacing Δ f (table 2 below), or _RA Leader sequence length L _RA And the uplink channel subcarrier spacing delta f.

Table 2: number of guard subcarriers

In the process of obtaining N by calculation _u In the embodiment, the number of physical resource blocks of the random access channel at each uplink channel subcarrier interval is calculated firstly:

wherein N is _SC The number of subcarriers of one physical resource block can be fixed as 12;

the number of physical resource blocks of random access channels at the subcarrier interval of each uplink channel; symbol

Is the upper rounding operation.

Then, the number of subcarriers used for guard bands in the random access channel is calculated as follows:

in the random access channel subcarrier spacing Δ f predefined by search _RA Length of leader sequence L _RA And frequency domain offset parameter of uplink channel subcarrier spacing delta f and leader sequence in random access channel

The corresponding relation table obtains the frequency domain offset parameter of the leader sequence in the random access channel

In the embodiment of the present disclosure, the following several possible correspondence tables are given.

One possible correspondence table is shown in table 3.

Table 3: parameter(s)

A possible value of

Another possible correspondence table is shown in table 4.

Table 4: parameter(s)

Another possible value of

A third possible correspondence table is shown in table 5.

Table 5: parameter(s)

Yet another possible value of

In the examples shown in tables 3, 4, and 5 above, the predefined correspondence table is known to both the UE and the base station, and the random access channel subcarrier spacing Δ f is obtained from the base station _RA Length of leader sequence L _RA And the uplink channel subcarrier spacing delta f in the system information, and corresponding parameters can be obtained from the corresponding relation table

Alternatively, table 5 may be simplified according to the preamble sequence format or the preamble sequence length, specifically as follows:

if the sequence length L _RA Is 139, then

The value is 3;

if the sequence length L _RA 839 and the spacing of the uplink channel sub-carriers is not 60kH, then

A value of 13;

if the sequence length L _RA 839 and the uplink channel subcarrier spacing is 60kH, then

The value is 157.

In addition, because the subcarrier spacing and the sequence length of the random access channel are directly determined by the format of the leader sequence, the frequency domain position offset can be determined according to the format of the leader sequence and the subcarrier spacing of the uplink channel

Also taking table 5 as an example:

for preamble sequence formats 0, 1 and 2, if the uplink channel subcarrier interval is not 60kHz, the frequency domain offset value is 13; if the interval of the uplink channel subcarrier is 60kHz, the value is 157;

for preamble sequence format 3, the frequency domain offset value is 13;

for preamble sequence formats A0, A1, A2, A3, B1, B2, B3, C0, C2, A1/B1, the frequency domain offset value is 3. The above description may also be determined in the form of a look-up table.

For correspondence tables of other manners (for example, table 3 and table 4), optimization of the correspondence table may also be performed in a similar manner. Namely, the first two columns of indexes in tables 3, 4 and 5 are merged to form the leader sequence format. Possible ways are shown in tables 6, 7, 8, for example.

Table 6: parameter(s)

Possible determination of

Table 7: parameter(s)

Another way of determining

Table 8: parameter(s)

Yet another value-taking mode of

Hereinafter, a structure of a UE according to an exemplary embodiment of the present invention will be described with reference to fig. 5. Fig. 5 schematically shows a block diagram of a UE 500 according to an exemplary embodiment of the present invention. The UE 500 may be configured to perform the method 200 described with reference to fig. 2. For the sake of brevity, only a schematic structure of the UE according to the exemplary embodiments of the present disclosure is described herein, and details that have been already detailed in the method 200 as described previously with reference to fig. 2 are omitted.

As shown in fig. 5, the UE 500 comprises a processing unit or processor 501, which processor 501 may be a single unit or a combination of units for performing the different steps of the method; a memory 502 having stored therein computer-executable instructions that, when executed by the processor 501, cause the processor 501 to: obtaining random access channel subcarrier spacing delta f from base station _RA Leader sequence length L _RA And an uplink channel subcarrier spacing Δ f; and according to the obtained random access channel subcarrier spacing delta f _RA Leader sequence length L _RA And the sub-carrier spacing delta f of the uplink channel, and determining the frequency domain offset parameter of the leader sequence in the random access channel

As mentioned above, the frequency domain offset parameter of the preamble sequence in the random access channel

Can be calculated, for example, by the three embodiments described above, or can be calculated by finding the predefined random access channel subcarrier spacing Δ f _RA Leader sequence length L _RA And frequency domain offset parameter of uplink channel subcarrier spacing delta f and leader sequence in random access channel

For example, one of the aforementioned tables 3 to 8, and may specifically refer to the related description of the method 200 in fig. 2.

A manner of generating a random access preamble sequence baseband signal will be described below. As described in the foregoing embodiments, the random access baseband signal is generated using the following formula.

K＝Δf/Δf _RA

Wherein the content of the first and second substances,

the frequency domain sequence generated for the preamble sequence is generated by the following formula.

k＝0，1，...，L _RA -1

β _PRACH An amplitude adjustment factor is obtained for power control to enable the transmitted signal to meet the constraints of power control. y is _u，v (k) For the frequency domain signal obtained by transforming the preamble sequence to the frequency domain, the following formula is adoptedObtaining the compound of the formula (II).

Wherein x is _u，c And (m) is a time domain leader sequence.

As can be seen from the above description, to generate the baseband signal, the following steps are required: DFT (discrete Fourier transform) for deriving a time-sequential preamble sequence x _u，v (m) generating a frequency-domain sequence y _u，v (n); subcarrier mapping, which is used for selecting the frequency domain position of the leader sequence according to the frequency domain position of the random access channel and the position of the leader sequence in the random access channel; IDFT (inverse discrete fourier transform) is used to generate the final time-domain baseband signal. The above steps can be represented by fig. 6.

For some preamble sequence formats, repetition in the time domain is required. The repetition module in fig. 6 is used to generate repeated preamble sequence symbols.

Considering that in practical implementation, DFT and IDFT are generally implemented by FFT (fast fourier transform) and IFFT (inverse fast fourier transform), and the number of FFT points is a power of 2. If the generation method is adopted, some problems in implementation will be caused by mismatching of the subcarrier intervals of the random access channel and the uplink data channel.

Specifically, for the case that the uplink channel subcarrier spacing is larger than the random access subcarrier spacing, the IFFT employed when converting the frequency domain signal into the time domain signal will require a larger number of IFFT points. A simple example is the case where the subcarrier interval of the random access channel is 1.25kHz and the uplink channel is 15kHz, and to meet the sampling interval specified in the protocol, 49152-point IFFT is required, and in time, for the adopted interval in LTE, 24576-point IFFT is also required.

In case that the uplink channel subcarrier spacing is smaller than the random access subcarrier spacing, the direct use of the uplink channel subcarrier spacing will cause some waste.

A possible improvement method is that the IFFT point number determined according to the length of the random access leader sequence is adopted, and the sampling interval of time domain sampling is determined according to the IFFT point number and the subcarrier interval of the random access channel. The sampling rate is adjusted after the cyclic prefix is added.

A flow chart of this improved method is shown in fig. 7.

In fig. 7, the number of points of IDFT is selected according to the sequence length. For example, for a preamble sequence of length 839, an IDFT of 1024 points is selected; for a preamble sequence of length 139, an IDFT of 512 points is selected.

The sampling interval of the time domain is selected according to the IDFT point number and the subcarrier frequency of the random access channel, and the specific selection is shown in the following table:

table 9: selection of time domain sampling frequency

The length of the cyclic prefix to be added subsequently should also be adjusted according to the above-mentioned relation between the required sampling frequency domain and the final sampling frequency. The sampling frequency of the time domain signal generated after IDFT is f _RA With a sampling interval of T _RA ＝1/f _RA Then the added cyclic prefix length is

Wherein, the first and the second end of the pipe are connected with each other,

the number of cyclic prefix points to be calculated from the number of IDFT points may be predetermined according to a preamble sequence format.

Considering that the maximum sampling frequency specified by 5G is not exceeded for each possible time-domain sampling interval, the subsequent sampling interval adjustment may employ up-sampling, and the time-domain signal subjected to IDFT, possible time-domain repetition, and cyclic prefix addition is up-sampled to generate a time-domain signal whose adoption rate satisfies the specification of a 5G system.

Since there is no frequency domain position selection in the foregoing flow (in the flow chart shown in fig. 6, subcarrier selection is used for completion), it is necessary to perform frequency domain position adjustment on the generated time domain signal. The module performs phase adjustment on the generated time domain signal considering that the frequency domain position is reflected in the time domain as phase adjustment.

One specific example is if the first sub-carrier of the preamble needs to be shifted by the position phi in the frequency domain _k If the signal at the time t needs to be phase-adjusted by the amount of

If the effect of CP is taken into account, the amount of phase adjustment should be

Wherein T is _c Is the system sampling rate. It should be noted that the frequency domain offset position in this example is measured by the subcarrier spacing Δ f of the uplink channel. If the subcarrier interval of the random access channel is adopted for measurement, the formula needs to be modified, and the phase adjustment quantity at the time point t is

Considering the influence of CP, the phase adjustment amount is

Wherein K = Δ f/Δ f _RA 。

In the foregoing example, the preamble sequence is defined in the time domain, and therefore, it is necessary to perform DFT to transform it into a frequency domain signal. Another simple way is to use the length L directly _RA I.e. using the sequence y directly _u，c (k) Or sequence of

At this time, a flowchart for generating the preamble sequence baseband signal is shown in fig. 8.

Computer-executable instructions or programs for implementing the functions of embodiments of the present invention can be recorded on computer-readable storage media. The corresponding functions can be realized by causing a computer system to read the programs recorded on the recording medium and execute the programs. The term "computer system" as used herein may be a computer system embedded in the device and may include an operating system or hardware (e.g., peripheral devices). The "computer-readable storage medium" may be a semiconductor recording medium, an optical recording medium, a magnetic recording medium, a recording medium that stores a program for short-term dynamics, or any other recording medium that is readable by a computer.

Various features or functional blocks of the devices used in the above-described embodiments may be implemented or performed by circuitry (e.g., a single or multiple chip integrated circuits). Circuitry designed to perform the functions described herein may include a general purpose processor, a Digital Signal Processor (DSP), an Application Specific Integrated Circuit (ASIC), a Field Programmable Gate Array (FPGA), or other programmable logic device, discrete gate or transistor logic, discrete hardware components, or any combination thereof. A general purpose processor may be a microprocessor, but in the alternative, the processor may be any conventional processor, controller, microcontroller, or state machine. The circuit may be a digital circuit or an analog circuit. Where new integrated circuit technologies have emerged as a replacement for existing integrated circuits due to advances in semiconductor technology, one or more embodiments of the present invention may also be implemented using these new integrated circuit technologies.

Those skilled in the art will appreciate that the present disclosure includes apparatus relating to performing one or more of the operations described in the present application. These devices may be specially designed and manufactured for the required purposes, or they may comprise known devices in general-purpose computers. These devices have stored therein computer programs that are selectively activated or reconfigured. Such a computer program may be stored in a device (e.g., computer) readable medium, including, but not limited to, any type of disk including floppy disks, hard disks, optical disks, CD-ROMs, and magnetic-optical disks, ROMs (Read-Only memories), RAMs (Random AcceSS memories), EPROMs (EraSable Programmable Read-Only memories), EEPROMs (Electrically EraSable Programmable Read-Only memories), flash memories, magnetic cards, or optical cards, or any type of media suitable for storing electronic instructions, and each coupled to a bus. That is, readable media includes any medium that stores or transmits information in a form readable by a device (e.g., a computer).

It will be understood by those within the art that each block of the block diagrams and/or flowchart illustrations, and combinations of blocks in the block diagrams and/or flowchart illustrations, can be implemented by computer program instructions. Those skilled in the art will appreciate that the computer program instructions may be implemented by a processor of a general purpose computer, special purpose computer, or other programmable data processing apparatus to produce a machine, such that the instructions, which execute via the processor of the computer or other programmable data processing apparatus, implement the aspects specified in the block or blocks of the block diagrams and/or flowchart illustrations of the present disclosure.

Those of skill in the art will appreciate that the various operations, methods, steps in the processes, acts, or solutions discussed in the present disclosure may be interchanged, modified, combined, or eliminated. Further, having various other steps, measures, or schemes in the operations, methods, or procedures that have been discussed in this disclosure may also be alternated, modified, rearranged, broken down, combined, or deleted. Further, steps, measures, schemes in the prior art having various operations, methods, procedures disclosed in the present disclosure may also be alternated, modified, rearranged, decomposed, combined, or deleted.

The foregoing is only a partial embodiment of the present disclosure, and it should be noted that, for those skilled in the art, various modifications and decorations can be made without departing from the principle of the present disclosure, and these modifications and decorations should also be regarded as the protection scope of the present disclosure.

Claims

1. A method performed by a terminal in a wireless communication system, comprising:

receiving first information on a length of a random access preamble and second information on a first subcarrier spacing of a random access channel from a base station;

receiving third information related to a second subcarrier interval of a Physical Uplink Shared Channel (PUSCH) from a base station;

determining an offset parameter from a plurality of offset parameters based on a combination of the first information, the second information, and the third information;

generating a baseband signal of a random access channel based on the offset parameter;

and sending a random access preamble based on the baseband signal.

2. The method of claim 1, further comprising determining a number of resource blocks of the random access channel based on a combination of the first information, the second information, and the third information.

3. The method of claim 1, wherein,

based on the length 839 of the random access preamble, the interval of the first subcarrier is 1.25kHz, and the interval of the second subcarrier is 15kHz, the offset parameter is 7 random access channel subcarriers;

based on the length 839 of the random access preamble, the interval between the first subcarriers is 1.25kHz, and the interval between the second subcarriers is 30kHz, the offset parameter is 1 random access channel subcarrier;

based on the length 839 of the random access preamble, the interval between the first subcarriers is 1.25kHz, and the interval between the second subcarriers is 60kHz, the offset parameter is 133 random access channel subcarriers;

based on the length 839 of the random access preamble, the interval of the first subcarrier is 5kHz, and the interval of the second subcarrier is 15kHz, the offset parameter is 12 random access channel subcarriers;

based on the length 839 of the random access preamble, the interval between the first subcarriers and the interval between the second subcarriers is 5kHz, and the interval between the second subcarriers is 30kHz, the offset parameter is 10 random access channel subcarriers;

the offset parameter is 7 random access channel subcarriers based on the length 839 of the random access preamble, the first subcarrier spacing of 5kHz, and the second subcarrier spacing of 60 kHz.

4. The method of claim 2, wherein,

based on the length 839 of the random access preamble, the interval of the first subcarrier is 1.25kHz, the interval of the second subcarrier is 15kHz, and the number of the resource blocks is 6;

based on the length 839 of the random access preamble, the interval of the first subcarrier is 1.25kHz, the interval of the second subcarrier is 30Hz, and the number of the resource blocks is 3;

based on the length 839 of the random access preamble, the interval of the first subcarrier is 1.25kHz, the interval of the second subcarrier is 60kHz, and the number of the resource blocks is 2;

based on the length 839 of the random access preamble, the interval between the first subcarriers is 5kHz, and the interval between the second subcarriers is 15kHz, the number of the resource blocks is 24;

based on the length 839 of the random access preamble, the interval between the first subcarriers is 5kHz, and the interval between the second subcarriers is 30kHz, the number of the resource blocks is 12;

based on the length 839 of the random access preamble, the interval between the first subcarriers is 5kHz, and the interval between the second subcarriers is 60kHz, the number of the resource blocks is 6.

5. The method of claim 1, wherein the offset parameter is determined such that the number of guard subcarriers spaced from both ends of a random access preamble sequence to a nearest PUSCH subcarrier is consistent.

6. A method performed by a base station in a wireless communication system, comprising:

transmitting first information related to a length of a random access preamble and second information related to a first subcarrier interval of a random access channel to a terminal;

transmitting third information related to a second subcarrier interval of a Physical Uplink Shared Channel (PUSCH) to the terminal;

receiving a random access preamble based on a baseband signal of a random access channel, wherein the baseband signal is generated based on an offset parameter corresponding to a combination of the first information, the second information, and the third information.

7. The method of claim 6, wherein a combination of the first information, the second information, and the third information is used to determine a number of resource blocks of a random access channel.

8. The method of claim 6, wherein,

based on the length 839 of the random access preamble, the interval of the first subcarrier is 1.25kHz, and the interval of the second subcarrier is 30kHz, the offset parameter is 1 random access channel subcarrier;

based on the length 839 of the random access preamble, the interval of the first subcarrier is 5kHz, and the interval of the second subcarrier is 15kHz, the offset parameter is 12 random access channel subcarriers; based on the length 839 of the random access preamble, the interval of the first subcarrier is 5kHz, and the interval of the second subcarrier is 30kHz, the offset parameter is 10 random access channel subcarriers;

9. The method according to claim 7, wherein,

based on the length 839 of the random access preamble, the interval of the first subcarrier is 1.25kHz, the interval of the second subcarrier is 30kHz, and the number of the resource blocks is 3;

based on the length 839 of the random access preamble, the interval between the first subcarriers is 1.25kHz, the interval between the second subcarriers is 60kHz, and the number of the resource blocks is 2;

based on the length 839 of the random access preamble, the interval between the first subcarriers and the interval between the second subcarriers is 5kHz, and the interval between the second subcarriers is 30kHz, the number of the resource blocks is 12;

10. A terminal in a wireless communication system, comprising:

a processor; and

a memory storing computer-executable instructions that, when executed by the processor, cause the processor to perform the method of any of claims 1-5.

11. A base station in a wireless communication system, comprising:

a processor; and

a memory storing computer-executable instructions that, when executed by the processor, cause the processor to perform the method of any of claims 6-9.