CN108809597B

CN108809597B - Method for determining cyclic shift amount of preamble sequence and method and device for configuring set thereof

Info

Publication number: CN108809597B
Application number: CN201710488133.1A
Authority: CN
Inventors: 张英杰; 钱辰; 喻斌; 熊琦
Original assignee: Samsung Electronics Co Ltd
Current assignee: Samsung Electronics Co Ltd
Priority date: 2017-05-05
Filing date: 2017-06-23
Publication date: 2023-05-26
Anticipated expiration: 2037-06-23
Also published as: CN108809597A

Abstract

The invention discloses a method for determining cyclic shift amount of a preamble sequence, a method and a device for configuring the set of the cyclic shift amount of the preamble sequence, wherein the method for determining the cyclic shift amount of the preamble sequence is applied to a user terminal, and the user terminal stores the cyclic shift amount set of the preamble sequence in advance, and comprises the following steps: receiving a system information block sent by a base station, and acquiring a first index carried in the system information block; selecting a preamble sequence cyclic shift amount N corresponding to the first index from a pre-stored preamble sequence cyclic shift amount set according to the first index _CS . The invention meets the requirements of complex and various coverage of a 5G wireless communication system, reduces the intra-cell interference and inter-cell interference, and provides lower access delay and better access experience for users.

Description

Method for determining cyclic shift amount of preamble sequence and method and device for configuring set thereof

Technical Field

The present invention relates to the field of wireless communications technologies, and in particular, to a method for determining cyclic shift of a preamble sequence, and a method and apparatus for configuring a set of cyclic shift of a preamble sequence.

Background

With the rapid development of the information industry, especially the growing demand from the mobile internet and internet of things (IoT, internet of things), the future mobile communication technology is challenged unprecedented. As the ITU-R m. is expected to grow by 2020 in accordance with the ITU (International Telecommunication Union, international telecommunications union) report, mobile traffic will grow approximately 1000 times as compared to 2010 (4G age), the number of user equipment connections will also exceed 170 billions, and as the vast number of IoT devices gradually penetrate mobile communication networks, the number of connected devices will be even more dramatic. In order to cope with the challenges not found before 2020, the communication industry and academia have developed extensive fifth generation mobile communication technology research (5G). The framework and overall goals of future 5G have been discussed in ITU's report ITU-R m, where the requirements of 5G are expected, the application scenario and important performance metrics are specified. Aiming at the new demand in 5G, the report ITU-R M. of ITU provides information related to the technical trend of 5G, and aims to solve the remarkable problems of remarkable improvement of system throughput, consistency of user experience, expansibility to support IoT, time delay, energy efficiency, cost, network flexibility, support of emerging services, flexible spectrum utilization and the like.

A Random Access (Random Access) procedure is an important step in a wireless communication system for establishing uplink synchronization between a user and a base station, and the base station allocates an ID for identifying the user, etc. to the user. The performance of random access directly affects the user experience. Among them, for conventional wireless communication systems, such as LTE (Long Term Evolution, long term evolution technology) and LTE-Advanced, a random access procedure is applied to various scenarios such as initial link establishment, cell handover, uplink re-establishment, RRC (Radio Resource Control, radio resource control protocol) connection re-establishment, and is divided into Contention-based random access (content-based Random Access) and non-Contention-based random access (content-free Random Access) according to whether a user has exclusive preamble sequence resources.

The contention-based random access procedure in LTE-a is divided into four steps, and as shown in fig. 1, before the random access procedure starts, the base station transmits configuration information of the random access procedure to the user, and the user performs the random access procedure according to the received configuration information. In the first step, the user randomly selects a preamble sequence from the preamble sequence resource pool and sends the preamble sequence to the base station. The base station performs correlation detection on the received signal, thereby identifying the preamble sequence transmitted by the user. In a second step, the base station transmits a random access response (Random Access Response, RAR) to the user, including the random access preamble identifier, a timing advance command determined according to the delay estimate between the user and the base station, a Temporary Cell radio network Temporary identifier (TC-Radio Network Temporary Identifier, TC-RNTI), and time-frequency resources allocated for the next uplink transmission of the user. In the third step, the user sends a third message (Msg 3) to the base station according to the information in the RAR; the Msg3 contains information such as a user terminal identifier and an RRC link request, where the user terminal identifier is unique to a user and is used to resolve a conflict. In the fourth step, the base station sends conflict resolution identification to the user, including the user terminal identification winning in the conflict resolution. After detecting the self-contained identifier, the user upgrades the temporary Cell radio network temporary identifier into a Cell-Radio Network Temporary Identifier (C-RNTI), and sends an ACK (Acknowledgement character) signal to the base station to complete the random access process and wait for the scheduling of the base station.

For non-contention based random access procedures, the user may be assigned a preamble sequence since the base station knows the user identity. Thus, the user does not need to randomly select a sequence when transmitting the preamble sequence, but can use the allocated preamble sequence. After detecting the allocated preamble sequence, the base station sends corresponding random access response including information such as timing advance and uplink resource allocation. After receiving the random access response, the user considers that the uplink synchronization is completed and waits for further scheduling of the base station. Thus, the initial access and non-contention based random access procedures only involve two steps: step one, transmitting a preamble sequence; and step two, sending a random access response. In the LTE-a system, a random access channel (Random Access Channel, RACH) uses a cyclic shift sequence of a Zadoff-Chu (ZC) sequence of length 839 as a preamble sequence. In an actual system, two sets of cyclic shift amounts of random access preamble sequences are configured, which are respectively called a non-limiting set and a limiting set, and correspond to a low-speed cell and a high-speed cell respectively, wherein the maximum supportable frequency offset of the high-speed cell is 1 time of the subcarrier spacing size of a random access channel.

The choice of the cyclic shift amount has a large impact on the random access performance. If the cyclic shift amount is too large, the number of cyclic shift sequences which can be generated by each ZC root sequence is reduced, so that the reuse of the ZC sequences is reduced, and the inter-cell interference is increased; if the cyclic shift amount is too small, the coverage area of the cell is reduced, and the networking requirement cannot be met. For a low-speed cell, the selection of the cyclic shift amount mainly considers the factors of cell coverage; for the high-speed cell, besides the factor of cell coverage, the influence of frequency offset on zero autocorrelation characteristic of ZC sequence needs to be considered.

In view of the above, the random access preamble sequence cyclic shift amount set configuration in the LTE-a system is shown in table 1 (N _CS Is the cyclic shift amount). Wherein the non-limiting set contains 16 cyclic shift amounts and the limiting set contains 15 cyclic shift amounts.

Table 1 set of LTE-a preamble sequences cyclic shift amounts

A user receives a 1-bit extra-High speed status indication (High-speed-flag) contained in a system information block (System Information Block, SIB): if the indication is 0, selecting a non-restricted set in Table 1; if the indication is 1, the restricted set in Table 1 is selected. Further, the user simultaneously reads an index (zerocorerelation) of the cyclic shift amount of the random access channel preamble sequence contained in the system information block, and determines a final cyclic shift amount from this index and the selected cyclic shift amount set.

In the generation process of the cyclic shift quantity of the existing preamble sequence, only two sets of a non-limiting set and a limiting set are defined, and the two sets correspond to a low-speed cell and a high-speed cell with the maximum frequency deviation of 1 time of the subcarrier spacing of the random access channel respectively. In a 5G wireless communication system, the system supports a millimeter wave level larger carrier frequency, uses subcarrier intervals of different sizes for different carrier frequencies, and correspondingly changes the coverage requirement of a cell, so that the existing cyclic shift amount set without frequency offset and the cyclic shift amount set with frequency offset of 1 are required to be redesigned. In addition, the high carrier frequency will also generate a larger carrier frequency offset, and at the high carrier frequency, the non-linearity of the rf device will also introduce a certain degree of carrier frequency offset. In this case, the carrier frequency offset may be much larger than 1 time the random access channel subcarrier spacing size, requiring the design of a new set of preamble sequence cyclic shift amounts.

As described above, the cyclic shift amount in LTE-a using the unrestricted set and the restricted set has not satisfied the requirements of the 5G wireless communication system. There is a need to design more sets of cyclic shift amounts and specific cyclic shift values in each set of cyclic shift amounts for different situations, and to design a corresponding method of determining cyclic shift amounts, for complex and diverse demands in 5G wireless communication systems.

Disclosure of Invention

The invention provides a method for determining cyclic shift of a preamble sequence and a method and a device for configuring the same, which are used for meeting the requirements of complex and various coverage and the like of a 5G wireless communication system, reducing intra-cell interference and inter-cell interference and providing lower access delay and better access experience for users.

The invention provides a method for determining cyclic shift quantity of a preamble sequence, which is applied to a user terminal, wherein the user terminal stores the cyclic shift quantity N of the preamble sequence in advance _CS A set, the determining method comprising:

receiving a system information block sent by a base station, and acquiring a first index carried in the system information block;

selecting a preamble sequence cyclic shift amount N corresponding to the first index from a pre-stored preamble sequence cyclic shift amount set according to the first index _CS 。

Preferably, the receiving base station obtains a first index carried in a system information block sent by the receiving base station, and specifically includes:

receiving at least one system information block sent by a base station;

and selecting one system information block from the at least one system information block according to a preset condition, and determining a first index carried in the selected system information block.

Preferably, the preset condition is that the synchronization signal block with the largest signal strength is preferentially selected, and each synchronization signal block carries at least one system information block.

Preferably, the preset condition is that a first received synchronization signal block is selected, and each synchronization signal block carries at least one system information block.

Preferably, each preamble sequence cyclic shift amount set corresponds to a second index, and the preamble sequence cyclic shift amount N corresponding to the first index is selected from the pre-stored preamble sequence cyclic shift amount sets according to the first index _CS Comprising:

acquiring a second index carried in the system information block;

selecting a preamble sequence cyclic shift amount N corresponding to the first index from a pre-stored preamble sequence cyclic shift amount set according to the first index and the second index _CS 。

Preferably, when the pre-stored preamble sequence cyclic shift amount set is at least two, the selecting the preamble sequence cyclic shift amount N corresponding to the first index from the pre-stored preamble sequence cyclic shift amount set according to the first index and the second index _CS Comprising:

determining a preamble sequence cyclic shift amount set corresponding to the second index from at least two preamble sequence cyclic shift amount sets stored in advance according to the second index;

Selecting a preamble sequence cyclic shift amount N corresponding to the first index from a preamble sequence cyclic shift amount set corresponding to the second index according to the first index _CS 。

selecting a preamble sequence cyclic shift amount N corresponding to the first index from a preamble sequence cyclic shift amount set corresponding to the second index according to the first index _CS ；

When based on the initial preamble sequence root sequence physical index and the selected preamble sequence cyclic shift N _CS When no preamble sequence can be generated, determining cyclic shift N of the preamble sequence _CS =0; otherwise, maintaining the cyclic shift N of the selected preamble sequence _CS Is unchanged.

Preferably, when the pre-stored preamble sequence cyclic shift amount set is one, the selecting the preamble sequence cyclic shift amount N corresponding to the first index from the pre-stored preamble sequence cyclic shift amount set according to the first index and the second index _CS Comprising:

when the second index is determined not to be 0, determining a preamble cyclic shift amount N _CS =0; otherwise, selecting a preamble sequence cyclic shift amount N corresponding to the first index from a pre-stored preamble sequence cyclic shift amount set according to the first index _CS 。

Preferably, when the pre-stored preamble sequence cyclic shift amount set is one, theSelecting a preamble sequence cyclic shift amount N corresponding to the first index from a pre-stored preamble sequence cyclic shift amount set according to the first index _CS Comprising:

if the system information block carries the direct configuration preamble sequence cyclic shift N _CS Determining an indication of a cyclic shift amount N of the preamble sequence _CS =0; otherwise, selecting a preamble sequence cyclic shift amount N corresponding to the first index from a pre-stored preamble sequence cyclic shift amount set according to the first index _CS 。

Preferably, the first index selects a preamble sequence cyclic shift N corresponding to the first index from a pre-stored preamble sequence cyclic shift set _CS The method specifically comprises the following steps:

if the direct configuration preamble sequence cyclic shift N carried in the system information block _CS When the indication of (1) is 1, determining the cyclic shift amount N of the preamble sequence _CS =0; otherwise, selecting a preamble sequence cyclic shift amount N corresponding to the first index from a pre-stored preamble sequence cyclic shift amount set according to the first index _CS 。

Preferably, each preamble sequence is cyclically shifted by an amount N _CS Corresponding to a first index.

The invention also discloses a method for configuring the cyclic shift quantity set of the preamble sequence, which comprises the following steps:

determining the cyclic shift N of the preamble sequence according to ZC sequence and frequency offset degree _CS All values are taken;

cyclic shift amount N in the preamble sequence _CS Selecting a preset number of cyclic shift N of the preamble sequence from all values _CS Generating a preamble sequence cyclic shift quantity set, and respectively transmitting the generated preamble sequence cyclic shift quantity set to a base station and a user terminal for storage.

Preferably, the index number of the ZC sequence is u, and u is more than or equal to 1 and less than or equal to N _ZC -1, determining the cyclic shift N of the preamble sequence according to ZC sequence and frequency offset degree _CS All values are specifically:

according to the ZC sequences and the frequency offset degree, calculating the cyclic shift N of the preamble sequences corresponding to the indexes of the u ZC sequences _CS All values are taken, and the calculated u preamble sequences are circularly shifted by N _CS The value is according to the cyclic shift quantity N of the preamble sequence _CS The preset value range of (2) is divided into Q groups;

and, at the preamble sequence cyclic shift amount N _CS Selecting a preset number of cyclic shift N of the preamble sequence from all values _CS Generating a preamble sequence cyclic shift amount set specifically includes:

cyclic shift amount N of preamble sequence in each of Q groups _CS Respectively selecting a preset number of cyclic shift amounts N of the preamble sequences from all values of the preamble sequences _CS Generating a cyclic shift quantity set of the preamble sequence;

wherein N is _ZC The length size of the ZC sequence is represented.

Preferably, the preamble sequence cyclic shift amount N in the preamble sequence cyclic shift amount set _CS The maximum number is P, and P is more than or equal to 1.

Preferably, the preamble sequences are cyclically shifted by an amount N in each of the groups divided into Q groups _CS A predetermined number of preamble sequences selected by the preamble sequence cyclic shift amount N _CS Specifically, zero cyclic shift N of preamble sequence is selected _CS Or at least one preamble cyclic shift amount N _CS 。

Preferably, the frequency offset degree includes 1, 2 and 3 times of the subcarrier spacing size of the random access channel, and the cyclic shift amount N of the preamble sequence _CS The value range of the (C) is not more than the absolute value of the difference of the cyclic shift size generated by the ZC sequence in the time domain under any two frequency offset degrees.

Preferably, when the frequency offset is 2 times the subcarrier spacing size of the random access channel, the preamble sequence is cyclically shifted by an amount N _CS The range of values of (2) further includes:

N _CS ≤d _u1 ≤(N _ZC -N _CS )/2

N _CS ≤d _u2 ≤(N _ZC -N _CS )/2

N _CS ≤|d _u1 -d _u2 |

wherein d _u1 Representing the smaller value, d, in the cyclic shift size generated in the time domain of the ZC sequence when the frequency offset is positive 1 times and negative 1 times the subcarrier spacing size of the random access channel _u2 Representing the smaller of the cyclic shift sizes generated in the time domain by the ZC sequence when the frequency offset is positive by a factor of 2 and negative by a factor of 2 random access channel subcarrier spacing size.

Preferably, when the frequency offset is at most 3 times the subcarrier spacing size of the random access channel, the preamble sequence is cyclically shifted by an amount N _CS The range of values of (2) further includes:

N _CS ≤d _u3 ≤(N _ZC -N _CS )/2

N _CS ≤|d _u3 -d _u1 |

N _CS ≤|d _u2 -d _u3 |

wherein d _u3 Representing the smaller value of the cyclic shift size generated by the ZC sequence in the time domain when the frequency offset degree is positive 3 times and negative 3 times of the subcarrier spacing size of the random access channel.

The invention also provides a device for determining the cyclic shift amount of the preamble sequence, which is applied to the user terminal and stores the cyclic shift amount N of the preamble sequence in advance _CS A set, the determining means comprising:

the first processing unit is used for receiving a system information block sent by a base station and acquiring a first index carried in the system information block;

A second processing unit, configured to select, according to the first index, a preamble sequence cyclic shift amount N corresponding to the first index from a pre-stored preamble sequence cyclic shift amount set _CS 。

The invention also provides a preamble sequence cyclic shift amount set configuration device, which comprises:

a first processing unit for determining the cyclic shift N of the preamble sequence according to the ZC sequence and the frequency offset degree _CS All values are taken;

a second processing unit for cyclically shifting the preamble sequence by an amount N _CS Selecting a preset number of cyclic shift N of the preamble sequence from all values _CS Generating a cyclic shift quantity set of the preamble sequence;

and the sending unit is used for respectively sending the generated preamble sequence cyclic shift quantity set to the base station and the user terminal for storage.

Compared with the prior art, the invention has at least the following advantages:

the invention meets the requirements of complex and various coverage of a 5G wireless communication system, reduces the intra-cell interference and inter-cell interference, and provides lower access delay and better access experience for users.

Drawings

Fig. 1 is a schematic diagram of a conventional contention-based random access procedure in the prior art;

fig. 2 is a flow chart of a method for confirming cyclic shift amount of a random access preamble sequence according to the present invention;

Fig. 3 is a schematic diagram of index of cyclic shift amount configuration of a preamble sequence and index transmission mode of cyclic shift amount set of the preamble sequence under multiple beams provided in the present invention;

fig. 4 is a schematic diagram of a transmitting end structure based on an antenna array according to the present invention;

fig. 5 is a schematic diagram of a user terminal designated beam direction provided by the present invention;

fig. 6 is a flow chart of a method for configuring a cyclic shift amount set of a preamble sequence according to the present invention;

fig. 7 is a flowchart of a method for configuring a cyclic shift amount set of a preamble sequence according to the present invention;

FIG. 8 is a schematic diagram of a set of cyclic shift amounts of a generated preamble sequence provided by the present invention;

fig. 9 is a schematic diagram of a frequency offset search window and a replica window of 1 time random access channel subcarrier spacing size provided in the present invention;

fig. 10 is a schematic diagram of a frequency offset search window and a replica window of 2 times the subcarrier spacing size of a random access channel provided in the present invention;

fig. 11 is a schematic diagram of a frequency offset search window and a replica window of 3 times the subcarrier spacing size of a random access channel provided in the present invention;

fig. 12 is a flowchart of a method for determining cyclic shift amount of a preamble sequence according to the present invention;

fig. 13 is a schematic structural diagram of a preamble sequence cyclic shift amount set configuration device according to the present invention;

Fig. 14 is a schematic structural diagram of a preamble sequence cyclic shift amount determining apparatus provided by the present invention.

Detailed Description

Embodiments of the present invention are described in detail below, examples of which are illustrated in the accompanying drawings, wherein like or similar reference numerals refer to like or similar elements or elements having like or similar functions throughout. The embodiments described below by referring to the drawings are illustrative only and are not to be construed as limiting the invention.

As used herein, the singular forms "a", "an", "the" and "the" are intended to include the plural forms as well, unless expressly stated otherwise, as understood by those skilled in the art. 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. The term "and/or" as used herein includes all or any element and all combination of one or more of the associated listed items.

It will be understood by those skilled in the art that 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 invention belongs unless defined otherwise. 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 used herein, a "terminal" or "terminal device" includes both a device of a wireless signal receiver having no transmitting capability and a device of receiving and transmitting hardware having receiving and transmitting hardware capable of bi-directional communication over a bi-directional communication link, as will be appreciated by those skilled in the art. Such a device may include: a cellular or other communication device having a single-line display or a multi-line display or a cellular or other communication device without a multi-line display; a PCS (PerSonal CommunicationS Service, personal communication system) that may combine voice, data processing, facsimile and/or data communication capabilities; a PDA (PerSonal Digital ASSiStant ) that can include a radio frequency receiver, pager, internet/intranet access, web browser, notepad, calendar and/or GPS (Global PoSitioning SyStem ) receiver; a conventional laptop and/or palmtop computer or other appliance that has and/or includes a radio frequency receiver. As used herein, "terminal," "terminal device" may be portable, transportable, installed in a vehicle (aeronautical, maritime, and/or land-based), or adapted and/or configured to operate locally and/or in a distributed fashion, to operate at any other location(s) on earth and/or in space. The "terminal" and "terminal device" used herein may also be a communication terminal, a network access terminal, and a music/video playing terminal, for example, may be a PDA, a MID (Mobile Internet Device ), and/or a mobile phone with a music/video playing function, and may also be a smart tv, a set top box, and other devices.

The method for determining the cyclic shift amount of the preamble sequence, the method for configuring the cyclic shift amount set of the preamble sequence, the device for configuring the cyclic shift amount set of the preamble sequence and the device for determining the cyclic shift amount of the preamble sequence are described one by combining with specific parameter designs.

The invention provides a method for determining cyclic shift quantity of a preamble sequence, which comprises the following steps as shown in fig. 2:

step 0 (initial set up): the communication system generates all preamble sequence cyclic shift amount sets, and allocates a unique index to each preamble sequence cyclic shift amount set, and simultaneously allocates a unique index to each preamble sequence cyclic shift amount in each preamble sequence cyclic shift amount set.

Step 1: the base station transmits a system information block, wherein the system information block comprises an index zeroCorrelation ZoneConfig of random access preamble sequence cyclic shift quantity configuration and an index CyclicShift SetIndex of a preamble sequence cyclic shift quantity set; the user terminal receives the system information block and reads the index zerocorerelation zoneconfig of the preamble cyclic shift amount configuration and the index cyclicdhiftsetindex of the preamble cyclic shift amount set contained therein.

Step 2: the user terminal selects a corresponding preamble sequence cyclic shift amount set from all preamble sequence cyclic shift amount sets generated in the initial step based on the index CyclicShiftSetIndex of the preamble sequence cyclic shift amount set received in step 1.

Step 3: the user terminal determines the final cyclic shift amount N of the preamble sequence in the cyclic shift amount set of the preamble sequence selected in the step 2 based on the index zerocorerelation of the cyclic shift amount configuration of the random access preamble sequence received in the step 1 _CS 。

It should be noted that, the above scheme can be adjusted as follows 4 kinds:

adjustment scheme 1:

Step 2: the user terminal selects, based on the index CyclicShiftSetIndex of the preamble cyclic shift amount set received in step 1, the following: if the index CyclicShift SetIndex of the preamble cyclic shift amount set is not 0, determining the preamble cyclic shift amount N _CS =0; otherwise, if the index cycloshift setindex of the preamble cyclic shift amount set is 0, step 3 is performed.

Step 3: the user terminal determines the final preamble sequence cyclic shift amount N in a pre-stored preamble sequence cyclic shift amount set based on the index zerocorerelation Zonecontrol of the random access preamble sequence cyclic shift amount configuration received in the step 1 _CS 。

Adjustment scheme 2:

step 1: the base station transmits a system information block, wherein the system information block comprises an index zerocorerelation Zonecontrol configured by the cyclic shift quantity of the random access preamble sequence, and further possibly comprises an indication zeroCyshift for directly configuring the cyclic shift quantity of the preamble sequence; the user terminal receives the system information block and reads the index zerocorerelation zoneconfig of the preamble sequence cyclic shift amount configuration contained therein and the indication zerocyclicdhift of the direct configuration preamble sequence cyclic shift amount possibly contained therein.

Step 2: the ue selects, based on the index of the preamble cyclic shift amount set received in step 1, the possibly received indicator zerocyclic shift of the direct configuration preamble cyclic shift amount, as follows: if receiving the indication zeroCycloShift of directly configuring the preamble sequence cyclic shift amount, determining the preamble sequence cyclic shift amount N _CS =0; otherwise, if the instruction zeroCycloShift of the direct configuration preamble sequence cyclic shift amount is not received, step 3 is performed.

Step 3: the user terminal based on the index zerocorerelation zoneconfig configured by the cyclic shift amount of the random access preamble sequence received in step 1, stores the preamble in advanceDetermining final preamble sequence cyclic shift N in sequence cyclic shift set _CS 。

Adjustment scheme 3:

step 1: the base station transmits a system information block which comprises an index zeroCorrelation ZoneConfig configured by the cyclic shift quantity of the random access preamble sequence and an indication zeroCycloShift for directly configuring the cyclic shift quantity of the preamble sequence; the user terminal receives the system information block and reads the index zerocorerelation zoneconfig configured by the cyclic shift amount of the preamble sequence contained in the system information block and the indication zerocyclicdhift directly configured by the cyclic shift amount of the preamble sequence.

Step 2: the user terminal selects, based on the index CyclicShiftSetIndex of the preamble sequence cyclic shift amount set received in step 1 and the instruction zeroCyclicShift directly configuring the preamble sequence cyclic shift amount, the following steps: if the received indication zeroCycloShift of the direct configuration preamble sequence cyclic shift amount is 1, determining the preamble sequence cyclic shift amount N _CS =0; otherwise, if the indicated zeroCycloShift of the direct configuration preamble sequence cyclic shift amount is not 1, step 3 is performed.

Adjustment scheme 4:

step 1: the base station transmits a system information block, wherein the system information block comprises an index zeroCorrelation ZoneConfig configured by the cyclic shift quantity of a random access preamble sequence, an index CyclicShiftSetIndex of the cyclic shift quantity set of the preamble sequence and an initial root sequence logical index rootsequence Index; the user terminal receives the system information block and reads the index zerocorerelation zonafigug, index cyclicsetindex and leader sequence logic index rootsequence index of the leader sequence cyclic shift quantity set which are contained in the system information block.

Step 2: the user terminal obtains the corresponding initial root sequence physical index u based on the initial root sequence logical index rootsequence index received in the step 1.

Step 3: the user terminal selects a corresponding preamble sequence cyclic shift amount set from all preamble sequence cyclic shift amount sets generated in the initial step based on the index CyclicShiftSetIndex of the preamble sequence cyclic shift amount set received in step 1.

Step 4: the user terminal determines the cyclic shift amount N of the preamble sequence in the cyclic shift amount set of the preamble sequence selected in the step 2 based on the index zerocorerelation zoneconfig of the cyclic shift amount configuration of the random access preamble sequence received in the step 1 _CS 。

Step 5: if the cyclic shift amount set of the preamble sequence corresponding to the index CyclicShift SetIndex of the cyclic shift amount set of the preamble sequence is a restriction set (restricted set), and any ZC sequence cannot be generated based on the initial root sequence physical index u obtained in the step 2 and the cyclic shift amount of the preamble sequence obtained in the step 4, determining the cyclic shift amount N of the preamble sequence _CS =0; otherwise, maintaining the cyclic shift amount N of the preamble sequence determined in step 4 _CS Is unchanged.

In step 1 of all the above schemes, the number of the system information blocks sent by the base station is at least one, as shown in fig. 3, the user terminal selects one system information block from the at least one system information block according to a preset condition, and determines an index carried in the selected system information block. The at least one system information block is transmitted, because the base station needs to determine the optimal transmitting beam direction of the base station according to the random access channel resource or the preamble sequence used by the user terminal, the system information blocks in the synchronization signal blocks included in different beams may be different, and in the step 1, the base station may transmit the system information block including the index configured by the cyclic shift amount of different preamble sequences and the system information block including the index of the cyclic shift amount set of the preamble sequence in different beams according to different cell coverage requirements corresponding to different beams. If the user detects the system information block in one or more synchronous signal blocks, the user selects the system information block in one synchronous signal block according to the maximum received signal strength, the first received signal or other criteria, and reads the index of the cyclic shift configuration of the preamble sequence and the index of the cyclic shift quantity set of the preamble sequence.

In the present invention, the base station may adopt a transmission structure based on an antenna matrix as shown in fig. 4, where each link after baseband processing is connected to an antenna array formed by each antenna unit through up-conversion and Digital-to-Analog Converter (DAC), each antenna in the antenna array can only adjust a phase, and the antenna array can form a beam in a proper direction by adjusting the phase, so as to complete beamforming of the system. To ensure beam coverage, the user terminal may be pre-assigned to point to different beam directions, as shown in fig. 5.

Based on the above step 0, the present invention provides a preamble sequence cyclic shift amount set configuration method, as shown in fig. 6, which includes:

step 601, determining the cyclic shift N of the preamble sequence according to the ZC sequence and the frequency offset degree _CS All values are taken.

Step 602, in the preamble sequence N _CS Selecting a preset number of cyclic shift N of the preamble sequence from all values _CS A set of cyclic shift amounts of the preamble sequence is generated.

Further, the generated preamble sequence cyclic shift amount set is respectively transmitted to the base station and the user terminal to be stored.

As shown in fig. 7, a schematic diagram of a cyclic shift amount set of a preamble sequence generated by the configuration method, where the method for generating a cyclic shift amount set of any preamble sequence specifically includes the following steps:

Step 700 (initial setup): determining a supported maximum preamble cyclic shift amount N _CS The number of (2) is P.

Step 701: and determining conditions such as coverage requirements of a plurality of cells and/or ZC sequence index values aiming at a certain frequency offset degree.

Step 702: based on the different conditions determined in step 701, the cyclic shift N of the preamble sequence under each condition is determined in combination with the frequency offset degree _CS Is used to determine the value of all possible values.

Step 703: the cyclic shift amount N of the preamble sequence determined from each condition in step 702 _CS Among all possible values, a plurality of cyclic shift N of the preamble sequence are selected respectively _CS (the number of choices can be zero, one or more, and the total number of the cyclic shift amounts correspondingly chosen by different conditions is smaller than P), a final set of cyclic shift amounts of the preamble sequences is generated, and each cyclic shift amount N of the preamble sequences in the set is respectively _CS A unique index is assigned.

Step 704: steps 701 to 703 are repeated for different frequency offset degrees until preamble sequence cyclic shift amount sets corresponding to all the frequency offset degrees are generated, and a unique index is allocated to each preamble sequence cyclic shift amount set.

In fig. 8, the number of sets of cyclic shift amounts of the preamble sequence generated by the system is S, and indexes of the sets of cyclic shift amounts of the preamble sequence are allocated to each set in turn, cyclicdetesetindex: index 0, index 1, …, index S-1. Wherein the cyclic shift amount N of the preamble sequence in each set _CS The number of elements is at most P, and the cyclic shift quantity N of the preamble sequence is sequentially allocated _CS The configured index zerocorerelationship zoneconfig: index 0, index 1, …, index P-1. The element P (p.ltoreq.P-1) in the set S (s.ltoreq.s.ltoreq.S-1) may be expressed as

If ZC sequence length is N _ZC Either->

The range of the values is as follows

Wherein the index of each preamble cyclic shift amount set is greater than 1bit.

It should be noted that any position element in any preamble cyclic shift amount set in fig. 8 may be null (i.e. at this position)

Absence). In this case, the number of elements in the preamble cyclic shift amount set is smaller than P.

Specifically, the system determines the number of cyclic shift amount sets of the preamble sequence according to all frequency offset degrees which can occur under different conditions. Wherein each set corresponds to a frequency offset level. The system simultaneously assigns a unique preamble cyclic shift amount set index, cycloshiftsetindex, to each set.

For example, when the maximum supported frequency offset of the system is 3 times the subcarrier spacing size of the random access channel, 4 preamble sequence cyclic shift amount sets may be generated and index 0, index 1, index 2, and index 3 may be allocated, respectively. The preamble sequence cyclic shift amount set corresponding to the index 0 supports no frequency offset or negligible frequency offset, the preamble sequence cyclic shift amount set corresponding to the index 1 supports the situation that the maximum frequency offset is 1 time of the subcarrier spacing size of the random access channel, the preamble sequence cyclic shift amount set corresponding to the index 2 supports the situation that the maximum frequency offset is 2 times of the subcarrier spacing size of the random access channel, and the preamble sequence cyclic shift amount set corresponding to the index 3 supports the situation that the maximum frequency offset is 3 times of the subcarrier spacing size of the random access channel.

In each preamble sequence cyclic shift amount set, based on the frequency offset degree corresponding to the set and combining different cell coverage requirements, and/or ZC sequence index value and other conditions, determining the cyclic shift amount N under each condition _CS And selecting a plurality of cyclic shift N of the preamble sequence from the possible values _CS The value (the number of the selections can be zero, one or more) forms a preamble sequence cyclic shift quantity set, and the selected preamble sequence cyclic shift quantity N is sequentially _CS Allocating unique preamble sequence cyclic shift amount N _CS The configuration index zerocorerelationship zoneconfig. The preamble sequence cyclic shift amount N in any preamble sequence cyclic shift amount set is specifically described _CS The number of elements cannot exceed the maximum number P.

The invention also provides a cyclic shift N based on the preamble sequence _CS The preamble sequence generation method of (2), the method comprises the following several different cases:

1. when the determined cyclic shift amount of the preamble sequence is N _CS And when the maximum frequency deviation is 2 times of the subcarrier interval size of the random access channel, generating all the preamble sequences based on the initial root sequence logic index u.

2. The determined cyclic shift amount of the preamble sequence is N _CS When the cyclic shift amount configuration index zerocorerelation zoneconfig of the preamble sequence corresponding to the cyclic shift amount is larger than a certain threshold value, generating all preamble sequences by using the method 1; otherwise, all the preambles are generated using method 2. The method 1 corresponds to a preamble sequence generation method supporting the maximum frequency deviation of 1 time of the subcarrier spacing size of the random access channel, and the method 2 corresponds to a preamble sequence generation method supporting the maximum frequency deviation of 2 times of the subcarrier spacing size of the random access channel.

3. The determined cyclic shift amount of the preamble sequence is N _CS When the cyclic shift amount configuration index zerocorerelation zoneconfig of the preamble sequence corresponding to the cyclic shift amount is smaller than a certain threshold value, generating all preamble sequences by using the method 1; otherwise, all the preambles are generated using method 2. The method 1 corresponds to a preamble sequence generation method supporting the maximum frequency deviation of 1 time of the subcarrier spacing size of the random access channel, and the method 2 corresponds to a preamble sequence generation method supporting the maximum frequency deviation of 2 times of the subcarrier spacing size of the random access channel.

The preamble sequence cyclic shift amount set configuration method provided by the present invention is described below in several embodiments.

Example 1

The duration of the random access preamble sequence is T when there is no frequency offset or the degree of frequency offset is negligible _SEQ By a length of N _ZC The cyclic shift sequence of ZC sequence as the preamble sequence, the maximum delay spread of the uplink asynchronous user is tau _DS Guard sampling at random access channel receiver to prevent pulse shaping filter envelopen _g 。

Under this condition, when the cell coverage radius requirement is r, the preamble sequence cyclic shift amount N _CS Is defined as

Wherein c is the speed of light.

Based on the above conditions, the preamble sequence cyclic shift amount set configuration method specifically includes:

step a (initial set up): determining a supported maximum preamble cyclic shift amount N _CS The number of (2) is P.

And (B) step (B): and selecting Q (Q is less than or equal to P) cell coverage radiuses r according to the actual requirements of cell coverage.

Step C: b, based on Q cell radiuses r determined in the step B, respectively determining a cyclic shift N of the preamble sequence under each cell radius r _CS Is a range of values.

Step D: cyclic shift N of preamble sequence determined from each cell radius r in step C _CS Respectively selecting a cyclic shift N of the preamble sequence in the range of the values _CS Generating a preamble sequence N finally containing Q elements _CS Aggregate and cyclically shift an amount N for each preamble sequence _CS Assigning a unique index; wherein, the index numbers are 0 to Q-1.

Wherein, in the step D, the cyclic shift N of the preamble sequence is determined from each cell radius r _CS Respectively selecting a cyclic shift N of the preamble sequence from the range of values _CS When the selected preamble sequence is cyclically shifted by N _CS Can be a minimum value of the cyclic shift N of the preamble sequence _CS Of course, the preamble sequence is cyclically shifted by an amount N _CS The choice of (c) is not limited thereto.

With no or negligible frequency offset in the first embodiment described above, three specific embodiments are described in detail below.

Detailed description of the preferred embodiments

By a length of N _ZC The cyclic shift sequence of the ZC sequence is used as a preamble sequence, the subcarrier spacing of the random access channel is delta f, and the duration time of the random access preamble sequence is T _SEQ The maximum delay spread of the uplink asynchronous user is tau _DS Guard sampling at random access channel receiver to prevent pulse shaping filter envelope from being n _g The cell coverage radius requirement is r, and the cyclic shift amount of the preamble sequence is N _CS 。

The value of the parameter is N _ZC ＝839，Δf＝2.5kHz，T _SEQ ＝400μs，τ _DS ＝2.6μs，n _g Under the assumption of=2, a preferred preamble cyclic shift amount set configuration method specifically includes:

Determining supported preamble cyclic shift amount N _CS The maximum number of (2) is 16.

The following cell radius values are selected in advance, and the cyclic shift N of the preamble sequence under the cell radius values is calculated respectively _CS Is a range of values:

(1) r=0.68 km, and N can be obtained by the preamble sequence cyclic shift quantity set configuration method _CS ≥17；

(2) r=0.82 km, and N can be obtained by the preamble sequence cyclic shift quantity set configuration method _CS ≥19；

(3) r=1.04 km, and N can be obtained by the preamble sequence cyclic shift quantity set configuration method _CS ≥22；

(4) r=1.32 km, and N can be obtained by the preamble sequence cyclic shift quantity set configuration method _CS ≥26；

(5) r=1.68 km, and N can be obtained by the preamble sequence cyclic shift quantity set configuration method _CS ≥31；

(6) r=2.04 km, and N can be obtained by the preamble sequence cyclic shift quantity set configuration method _CS ≥36；

(7) r=2.40 km, and N can be obtained by the preamble sequence cyclic shift quantity set configuration method _CS ≥41；

(8) r=2.76 km, and N can be obtained by the preamble sequence cyclic shift quantity set configuration method _CS ≥46；

(9) r=3.69 km, and N can be obtained by the preamble sequence cyclic shift quantity set configuration method _CS ≥59；

(10) r=4.90 km, and N can be obtained by the preamble sequence cyclic shift quantity set configuration method _CS ≥76；

(11) r=6.12 km, and N can be obtained by the preamble sequence cyclic shift quantity set configuration method _CS ≥93；

(12) r=7.92 km, and N can be obtained by the preamble sequence cyclic shift quantity set configuration method _CS ≥119；

(13) r=11.4 km, and N can be obtained by the preamble sequence cyclic shift quantity set configuration method _CS ≥167；

(14) r=19.42 km, and N can be obtained by the preamble sequence cyclic shift quantity set configuration method _CS ≥279；

(15) r= 29.43km, and N can be obtained by the preamble sequence cyclic shift quantity set configuration method _CS ≥419；

(16) r= 59.47km, and N can be obtained by the preamble sequence cyclic shift quantity set configuration method _CS Not less than 839, N _CS ＝0。

Cyclic shift amount N from the above 16 preamble sequences _CS Selecting cyclic shift N of preamble sequence in the range of the value _CS Forms a preamble cyclic shift amount set {0,17,19,22,26,31,36,41,46,59,76,93,119,167,279,419}. Cyclic shift by preamble sequence by N _CS The cyclic shift amount N of each preamble sequence is respectively in the order of the values from small to large _CS Indexes 0-15 are assigned. The final set of cyclic shifts of the preamble sequence is shown in table 2 below:

Table 2 preamble cyclic shift amount set

N _CS Configuration of	N _CS Value taking
		0	0
1	17
		2	19
3	22
		4	26
5	31
		6	36
7	41
		8	46
9	59
		10	76
11	93
		12	119
13	167
		14	279
15	419

Second embodiment

The value of the parameter is N _ZC ＝839，Δf＝5kHz，T _SEQ ＝200μs，τ _DS ＝1.3μs，n _g Under the assumption of=2, a preferred preamble cyclic shift amount set configuration method specifically includes:

determining supported preamble cyclic shift amount N _CS Is 16 in maximum number;

(1) r=0.66 km, and N can be obtained by the preamble sequence cyclic shift quantity set configuration method _CS ≥26；

(2) r=0.73 km, and N can be obtained by the preamble sequence cyclic shift quantity set configuration method _CS ≥28；

(3) r=0.84 km, and N can be obtained by the preamble sequence cyclic shift quantity set configuration method _CS ≥31；

(4) r=0.95 km, and N can be obtained by the preamble sequence cyclic shift quantity set configuration method _CS ≥34；

(5) r=1.09 km, and N can be obtained by the preamble sequence cyclic shift quantity set configuration method _CS ≥38；

(6) r=1.31 km, and N can be obtained by the preamble sequence cyclic shift quantity set configuration method _CS ≥44；

(7) r=1.56 km, and N can be obtained by the preamble sequence cyclic shift quantity set configuration method _CS ≥51；

(8) r=1.81 km, and N can be obtained by the preamble sequence cyclic shift quantity set configuration method _CS ≥58；

(9) r=2.13 km, and N can be obtained by the preamble sequence cyclic shift quantity set configuration method _CS ≥67；

(10) r=2.45 km, and N can be obtained by the preamble sequence cyclic shift quantity set configuration method _CS ≥76；

(11) r=3.06 km, and N can be obtained by the preamble sequence cyclic shift quantity set configuration method _CS ≥93；

(12) r=3.99 km, and N can be obtained by the preamble sequence cyclic shift quantity set configuration method _CS ≥119；

(13) r=5.70 km, and N can be obtained by the preamble sequence cyclic shift quantity set configuration method _CS ≥167；

(14) r=9.71 km, and N can be obtained by the preamble sequence cyclic shift quantity set configuration method _CS ≥279；

(15) r=14.72 km, the preamble sequence cyclic shift quantity set configuration method according to the invention can obtainN _CS ≥419；

(16) r=29.73 km, and N can be obtained by the preamble sequence cyclic shift quantity set configuration method _CS Not less than 839, N _CS ＝0。

Cyclic shift amount N from the above 16 preamble sequences _CS Selecting cyclic shift N of preamble sequence in the range of the value _CS Forms a preamble cyclic shift amount set {0,26,28,31,34,38,44,51,58,67,76,93,119,167,279,419}. Cyclic shift by preamble sequence by N _CS The cyclic shift amount N of each preamble sequence is respectively in the order of the values from small to large _CS Indexes 0-15 are assigned. The final set of cyclic shifts of the preamble sequence is shown in table 3 below:

TABLE 3 set of cyclic shift amounts for preamble sequences

N _CS Configuration of	N _CS Value taking
		0	0
1	26
		2	28
3	31
		4	34
5	38
		6	44
7	51
		8	58
9	67
		10	76
11	93
		12	119
13	167
		14	279
15	419

Detailed description of the preferred embodiments

By a length of N _ZC The cyclic shift sequence of the ZC sequence is used as a preamble sequence, the subcarrier spacing of the random access channel is delta f, and the duration time of the random access preamble sequence is T _SEQ The maximum delay spread of the uplink asynchronous user is tau _DS For preventing at random access channel receiverThe guard samples at one location of the pulse shaping filter envelope are n _g The cell coverage radius requirement is r, and the cyclic shift amount of the preamble sequence is N _CS 。

The value of the parameter is N _ZC ＝139，Δf＝7.5kHz，T _SEQ ＝133.33μs，τ _DS ＝0.87μs，n _g Under the assumption of=0, a preferred preamble cyclic shift amount set configuration method specifically includes:

(1) r=0.16 km, and N can be obtained by the preamble sequence cyclic shift quantity set configuration method _CS ≥2；

(2) r=0.45 km, and N can be obtained by the preamble sequence cyclic shift quantity set configuration method _CS ≥4；

(3) r=0.73 km, and N can be obtained by the preamble sequence cyclic shift quantity set configuration method _CS ≥6；

(4) r=1.02 km, and N can be obtained by the preamble sequence cyclic shift quantity set configuration method _CS ≥8；

(5) r=1.31 km, and N can be obtained by the preamble sequence cyclic shift quantity set configuration method _CS ≥10；

(6) r=1.60 km, and N can be obtained by the preamble sequence cyclic shift quantity set configuration method _CS ≥12；

(7) r=2.03 km, and N can be obtained by the preamble sequence cyclic shift quantity set configuration method _CS ≥15；

(8) r=2.46 km, and N can be obtained by the preamble sequence cyclic shift quantity set configuration method _CS ≥18；

(9) r=3.03 km, and N can be obtained by the preamble sequence cyclic shift quantity set configuration method _CS ≥22；

(10) r=3.61 km, and N can be obtained by the preamble sequence cyclic shift quantity set configuration method _CS ≥26；

(11) r=4.33 km, and N can be obtained by the preamble sequence cyclic shift quantity set configuration method _CS ≥31；

(12) r=5.05 km, and N can be obtained by the preamble sequence cyclic shift quantity set configuration method _CS ≥36；

Cyclic shift amount N from the above 12 preamble sequences _CS Selecting cyclic shift N of preamble sequence in the range of the value _CS Forms a preamble cyclic shift amount set {2,4,6,8,10,12,15,18,22,26,31,36}. Cyclic shift by preamble sequence by N _CS The cyclic shift amount N of each preamble sequence is respectively in the order of the values from small to large _CS Indexes 0-12 are assigned. The final set of cyclic shifts of the preamble sequence is shown in table 4 below:

table 4 preamble cyclic shift amount set

N _CS Configuration of	N _CS Value taking
		0	2
1	4
		2	6
3	8
		4	10
5	12
		6	15
7	18
		8	22
9	26
		10	31
11	36
		12	-
13	-
		14	-
15	-

The following describes embodiments two to four specifically for the frequency offset level including 1, 2, and 3 times the random access channel subcarrier spacing size.

Wherein the frequency offset degree comprises 1, 2 and 3 times of the subcarrier spacing size of the random access channel, and the cyclic shift amount N of the preamble sequence _CS The value range of the (C) is not more than the absolute value of the difference of the cyclic shift size generated by the ZC sequence in the time domain under any two frequency offset degrees.

Example two

When the frequency offset is 1 time of the subcarrier spacing of the random access channel, the preamble sequence adopts the length of N _ZC The cyclic shift sequence of the ZC sequence of (a) is used as a preamble sequence, and the u (u is more than or equal to 1 and N is more than or equal to N) _ZC -1) root sequence is

Where u is the ZC sequence index.

For the u-th ZC root sequence, when the frequency offset degree is positive 1 times of the subcarrier spacing size of the random access channel, the ZC sequence generates the subcarrier spacing size in the time domain as follows

Is a cyclic shift of (a); when the frequency offset degree is negative 1 times of the subcarrier spacing size of the random access channel, the ZC sequence generates a size of +.>

Is used for cyclic shift of (a).

During preamble sequence detection, the cyclic shift distortion will cause the power delay spectrum (Power Delay Profile, PDP) to generate false alarm peaks, and an error cyclic shift replica window occurs. As shown in fig. 9, in an actual system, both the positive frequency offset signal and the negative frequency offset signal exist, so 2 error cyclic shift search windows may occur. Wherein C is ₀ Representing the correct original cyclic shift search window, C _-1 Representing the error copy search window caused by negative frequency offset, C ₊₁ Representing the error copy search window caused by the positive frequency offset.

In this kind ofIn the case of cyclic shift of the same ZC sequence, the preamble sequence N generates no interference between sequences _CS The following conditions need to be met: error search window C of any cyclic shift ZC sequence _-1 And C ₊₁ Are not overlapped with each other and are cyclically shifted with C of ZC sequence _-1 、C ₀ And C ₊₁ Non-overlapping and correct with itself cyclic shift search window C ₀ Nor overlap. Definition of the definition

Wherein, the liquid crystal display device comprises a liquid crystal display device,

final preamble cyclic shift amount N _CS The conditions to be satisfied are

N _CS ≤d _u ≤(N _ZC -N _CS )/2

The preamble sequence cyclic shift N is used for different cell coverage requirements _CS The conditions that need to be satisfied are the same as those described in the foregoing embodiment one.

And (B) step (B): based on ZC sequence length N _ZC The indexes u (u is more than or equal to 1 and less than or equal to N) of all ZC sequences are selected _ZC -1)。

Step C: for indexes u and frequency offset degrees of ZC sequences which are different, respectively calculating the cyclic shift N of the preamble sequences corresponding to all ZC sequence indexes u _CS Is a range of values.

Step D: based on N obtained in step C _ZC -1 preamble cyclic shift amount N _CS Dividing ZC sequence index u into Q groups (Q is less than or equal to P), and cyclic shift N of the corresponding preamble sequence of each group _CS Is close to the value range of (a) intersection of these value rangesIs not an empty set. Cyclic shift from each group of common preamble sequences by an amount N in combination with different cell coverage requirements _CS Selecting a cyclic shift N of the preamble sequence from the value range _CS Generating a preamble sequence cyclic shift quantity set finally containing Q elements, and respectively carrying out cyclic shift quantity N for each preamble sequence _CS A unique index is assigned. Wherein, the index numbers are 0 to Q-1.

Wherein the cyclic shift amount N is shifted from each group of common preamble sequences _CS Selecting a cyclic shift N of a preamble sequence from a value range _CS When the selected preamble sequence is cyclically shifted by N _CS Can be a minimum value of the cyclic shift N of the preamble sequence _CS Of course, the preamble sequence is cyclically shifted by an amount N _CS The choice of (c) is not limited thereto.

In this embodiment, when the preset generation condition is ZC sequence and frequency offset degree, step 601 in fig. 6 is described above, and the cyclic shift N of the preamble sequence is determined according to ZC sequence and frequency offset degree _CS All values are specifically:

step 602, cyclic shift N of the preamble sequence _CS Selecting a preset number of cyclic shift N of the preamble sequence from all values _CS Generating a preamble sequence cyclic shift amount set specifically includes:

cyclic shift amount N of preamble sequence in each of Q groups _CS Respectively selecting a preset number of cyclic shift amounts N of the preamble sequences from all values of the preamble sequences _CS A set of cyclic shift amounts of the preamble sequence is generated.

Wherein the cyclic shift amount N of the preamble sequence in the cyclic shift amount set of the preamble sequence _CS The maximum number is P, and P is more than or equal to 1; cyclic shift amount N of preamble sequence in each group divided into Q groups _CS A predetermined number of preamble sequences selected by the preamble sequence cyclic shift amount N _CS Comprising cyclic shift N for zero preamble sequences _CS Or at least one preamble cyclic shift amount N _CS 。

In the above embodiment, the following description will be made in detail with respect to several specific embodiments under the condition that the frequency offset is 1 time as large as the subcarrier spacing of the random access channel.

Detailed description of the preferred embodiments

By a length of N _ZC A cyclic shift sequence of ZC sequence=139 as a preamble sequence, when the random access channel subcarrier spacing is Δf=7.5 kHz or Δf=15 kHz or Δf=30 kHz or Δf=60 kHz or Δf=120 kHz, a preferred preamble sequence cyclic shift amount set configuration method specifically includes:

determining supported cyclic shift amount N _CS Is 16 in maximum number;

when the length of ZC root sequence is N _ZC And when the root sequence index is u, the cyclic shift amount N of the preamble sequence _CS The maximum value of (2) is S (u). For the root sequence index u (u is more than or equal to 1 and less than or equal to 138) of ZC sequence, respectively calculating the cyclic shift N of the preamble sequence _CS The maximum value S (u) was calculated, and the calculation result is shown in table 5 below.

TABLE 5 cyclic shift amount N of preamble sequence _CS Maximum value S (u) of the values

According to the cyclic shift N of the preamble sequence _CS And (5) dividing the ZC root sequence index into 12 groups according to the maximum value calculation result. Specific grouping condition and cyclic shift N of each group of preamble sequence _CS The common value ranges of (2) are shown in the following table 6:

TABLE 6 cyclic shift amount N of preamble sequence _CS Maximum value grouping situation

Based on the grouping result, discarding the 1 st group and the preamble sequence cyclic shift N corresponding to the last 11 groups _CS Respectively selecting the cyclic shift N of the preamble sequence in the value range _CS The maximum value is formed into a preamble sequence cyclic shift quantity set {3,5,7,9,11,13,16,20,24,30,37}. Cyclic shift by preamble sequence by N _CS The cyclic shift amount N of each preamble sequence is respectively in the descending order of the values _CS Indexes 0-10 are allocated, and the finally generated preamble sequence cyclic shift amount set is shown in the following table 7:

TABLE 7 set of cyclic shift amounts for preamble sequences

Detailed description of the preferred embodiments

On the basis of the third and fourth embodiments, the present embodiment employs a length of N _ZC A cyclic shift sequence of ZC sequence=139 as a preamble sequence, when the random access channel subcarrier spacing is Δf=7.5 kHz or Δf=15 kHz or Δf=30 kHz or Δf=60 kHz or Δf=120 kHz, a preferred preamble sequence cyclic shift amount set configuration method specifically includes:

based on conditions such as cell coverage requirement, ZC sequence index value and the like, combining different frequency offset degrees, generating a preamble sequence cyclic shift quantity set without frequency offset (or with frequency offset being negligible) and with frequency offset of maximum 1 time of the subcarrier interval size of the random access channel respectively. The final set of cyclic shift amounts of the preamble sequence is shown in table 8 below, in which table 8, set 0 represents the set of cyclic shift amounts of the preamble sequence without frequency offset or with frequency offset negligible, and set 1 represents the set of cyclic shift amounts of the preamble sequence with frequency offset up to 1 time the random access channel subcarrier spacing size.

Table 8 preamble cyclic shift amount set

Description of the preferred embodiments

By a length of N _ZC A cyclic shift sequence of ZC sequence=839 as a preamble sequence, when the random access channel subcarrier spacing is Δf=1.25 kHz or Δf=2.5 kHz or Δf=5 kHz, a preferred cyclic shift amount set configuration method for the preamble sequence specifically includes:

when the length of ZC root sequence is N _ZC And when the root sequence index is u, the cyclic shift amount N of the preamble sequence _CS The maximum value of (2) is S (u). For the root sequence index u (u is not less than 1 and not more than 838) of ZC sequence, the cyclic shift N of the leading sequence is calculated _CS The maximum value S (u) was calculated as shown in table 9 below.

TABLE 9 cyclic shift amount N of preamble sequence _CS Maximum value S (u) of the values

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According to the cyclic shift N of the preamble sequence _CS And (5) dividing the ZC root sequence index into 14 groups according to the maximum value calculation result. Specific grouping condition and cyclic shift N of each group of preamble sequence _CS The common value ranges of (a) are shown in the following table 10:

table 10 cyclic shift amount N of preamble sequence _CS Maximum value grouping situation

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Based on the grouping result, discarding the 1 st group, and the preamble sequence cyclic shift N corresponding to the last 15 groups _CS Respectively selecting the cyclic shift N of the preamble sequence in the value range _CS The maximum value is formed into a preamble sequence cyclic shift quantity set {19,22,26,31,36,41,46,55,68,82,100,128,158,202,237}. Cyclic shift by preamble sequence by N _CS The cyclic shift amount N of each preamble sequence is respectively in the descending order of the values _CS Indexes 0-15 are allocated, and the finally generated preamble sequence cyclic shift amount set is shown in the following table 11:

TABLE 11 preamble cyclic shift amount set

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Detailed description of the preferred embodiments

On the basis of the first embodiment and the sixth embodiment, a length of N is adopted _ZC A cyclic shift sequence of ZC sequence=839 as a preamble sequence, when the random access channel subcarrier spacing is Δf=1.25 kHz or Δf=2.5 kHz or Δf=5 kHz, a preferred cyclic shift amount set configuration method for the preamble sequence specifically includes:

based on conditions such as cell coverage requirement, ZC sequence index value and the like, combining different frequency offset degrees, generating a preamble sequence cyclic shift quantity set without frequency offset (or with frequency offset being negligible) and with frequency offset of maximum 1 time of the subcarrier interval size of the random access channel respectively. The final set of cyclic shift amounts of the preamble sequence is shown in table 12 below, in which table 12, set 0 represents the set of cyclic shift amounts of the preamble sequence without frequency offset or with frequency offset negligible, and set 1 represents the set of cyclic shift amounts of the preamble sequence with frequency offset up to 1 time the random access channel subcarrier spacing size.

Table 12 preamble cyclic shift amount set

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Description of the preferred embodiments

when the length of ZC root sequence is N _ZC And when the root sequence index is u, the cyclic shift amount N of the preamble sequence _CS The maximum value of (2) is S (u). For the root sequence index u (u is not less than 1 and not more than 838) of ZC sequence, the cyclic shift N of the leading sequence is calculated _CS The maximum value S (u) was calculated as shown in table 13 below.

TABLE 13 cyclic shift amount N of preamble sequence _CS Maximum value S (u) of the values

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According to the cyclic shift N of the preamble sequence _CS And (5) dividing the ZC root sequence index into 14 groups according to the maximum value calculation result. Specific grouping condition and cyclic shift N of each group of preamble sequence _CS The common value ranges of (a) are shown in the following table 14:

TABLE 14 cyclic shift amount N of preamble sequence _CS Maximum value grouping situation

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Based on the grouping result, discarding the 1 st group, and the preamble sequence cyclic shift N corresponding to the last 15 groups _CS Respectively selecting the cyclic shift N of the preamble sequence in the value range _CS The maximum value is formed into a preamble sequence cyclic shift quantity set {28,31,34,38,44,51,58,67,76,86,100,128,158,202,237}. Cyclic shift by preamble sequence by N _CS The cyclic shift amount N of each preamble sequence is respectively in the descending order of the values _CS Indexes 0-15 are allocated, and the finally generated preamble sequence cyclic shift amount set is shown in the following table 15:

table 15 preamble cyclic shift amount set

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Detailed description of the preferred embodiments

On the basis of the second embodiment and the eighth embodiment, a length of N is adopted _ZC A cyclic shift sequence of ZC sequence=839 as a preamble sequence, when the random access channel subcarrier spacing is Δf=1.25 kHz or Δf=2.5 kHz or Δf=5 kHz, a preferred cyclic shift amount set configuration method for the preamble sequence specifically includes:

based on conditions such as cell coverage requirement, ZC sequence index value and the like, combining different frequency offset degrees, generating a preamble sequence cyclic shift quantity set without frequency offset (or with frequency offset being negligible) and with frequency offset of maximum 1 time of the subcarrier interval size of the random access channel respectively. The final set of cyclic shift amounts of the preamble sequence is shown in table 16 below, in which table 16, set 0 represents the set of cyclic shift amounts of the preamble sequence without frequency offset or with frequency offset negligible, and set 1 represents the set of cyclic shift amounts of the preamble sequence with frequency offset up to 1 time the random access channel subcarrier spacing size.

Table 16 preamble cyclic shift amount set

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Example III

When the frequency offset is 2 times of the subcarrier spacing of the random access channel, the preamble sequence adopts the length of N _ZC The cyclic shift sequence of the ZC sequence of (a) is used as a preamble sequence, and the u (u is more than or equal to 1 and N is more than or equal to N) _ZC -1) root sequence is

Where u is the ZC sequence index.

Is a cyclic shift of (a); when the frequency offset degree is positive and 2 times of the subcarrier spacing size of the random access channel, the ZC sequence generates the subcarrier spacing size in the time domain

Is a cyclic shift of (a); when the frequency offset degree is negative 2 times of the subcarrier spacing size of the random access channel, the ZC sequence generates a size of +.>

Is used for cyclic shift of (a). />

During preamble sequence detection, the cyclic shift distortion will cause the power delay spectrum PDP to generate a false alarm peak value, and an error cyclic shift replica window occurs. As shown in fig. 10, in an actual system, both positive 1-time and 2-time frequency offset signals and negative 1-time and 2-time frequency offset signals exist, so that 4 error cyclic shift search windows occur. Wherein C is ₀ Representing the correct original cyclic shift search window, C _-1 Representing the error copy search window, C, caused by negative 1-fold frequency offset _-2 Representing the error copy search window, C, caused by negative frequency doubling offset 2 ₊₁ Representing the error copy search window, C, caused by a positive 1-fold offset ₊₂ Representing the error copy search window caused by the positive 2-fold offset.

In this case, the cyclic shift amount N is such that cyclic shift of the same ZC sequence generates no interference between sequences _CS The following conditions need to be met: error search window C of any cyclic shift ZC sequence _-1 、C _-2 、C ₊₁ And C ₊₂ Are not overlapped with each other and are cyclically shifted with C of ZC sequence _-1 、C _-2 、C ₀ 、C ₊₁ And C ₊₂ Non-overlapping and correct with itself cyclic shift search window C ₀ Nor overlap. Definition of the definition

And is also provided with

final leader sequence N _CS The conditions to be satisfied are

N _CS ≤d _u1 ≤(N _ZC -N _CS )/2

N _CS ≤d _u2 ≤(N _ZC -N _CS )/2

N _CS ≤|d _u1 -d _u2 |

In the above formula, d _u1 Representing the smaller value, d, in the cyclic shift size generated in the time domain of the ZC sequence when the frequency offset is positive 1 times and negative 1 times the subcarrier spacing size of the random access channel _u2 Representing the smaller of the cyclic shift sizes generated in the time domain by the ZC sequence when the frequency offset is positive by a factor of 2 and negative by a factor of 2 random access channel subcarrier spacing size.

Note that, for different cell coverage requirements, the preamble sequence N _CS The conditions to be satisfied are the same as those described in the foregoing embodiment one.

Step D: based on N obtained in step C _ZC -1 preamble cyclic shift amount N _CS Dividing ZC sequence index u into Q groups (Q is less than or equal to P), each group corresponding to the preambleColumn cyclic shift amount N _CS Is close to the value range of (c) and the intersection of these value ranges is not an empty set. Cyclic shift from each group of common preamble sequences by an amount N in combination with different cell coverage requirements _CS Selecting one leader sequence N from the value range _CS Generating a preamble sequence cyclic shift quantity set finally containing Q elements, and respectively carrying out cyclic shift quantity N for each preamble sequence _CS A unique index is assigned. Wherein, the index numbers are 0 to Q-1.

In this embodiment, when the preset generation condition is ZC sequence and frequency offset degree, step 601 in fig. 6 is described above, and the cyclic shift N of the preamble sequence is determined according to ZC sequence and frequency offset degree _CS All values, including:

Wherein, the cyclic shift N of the preamble sequence is divided into Q groups _CS The selected preset number of preamble sequences are circularly shiftedBit amount N _CS Specifically, zero cyclic shift N of preamble sequence is selected _CS Or at least one preamble cyclic shift amount N _CS 。

In the above embodiment, the following description will be made in detail with respect to several specific embodiments under the condition that the frequency offset is 2 times as large as the subcarrier spacing of the random access channel.

Detailed description of the preferred embodiments

when the length of ZC root sequence is N _ZC And the root sequence index is u, the preamble sequence N _CS The maximum value of (2) is S (u). For the root sequence index u (u is more than or equal to 1 and less than or equal to 138) of ZC sequence, respectively calculating the cyclic shift N of the preamble sequence _CS The maximum value S (u) was calculated as shown in table 17 below.

Table 17 cyclic shift amount N of preamble sequence _CS Maximum value S (u) of the values

u	1	2	3	4	5	6	7	8	9	10	11	12
													S(u)	1	1	1	1	27	23	20	17	15	14	13	23
u	13	14	15	16	17	18	19	20	21	22	23	24
													S(u)	11	10	9	26	8	23	22	7	20	19	6	23
u	25	26	27	28	29	30	31	32	33	34	35	36
													S(u)	11	16	5	5	24	14	9	13	21	4	4	27
u	37	38	39	40	41	42	43	44	45	46	47	48
													S(u)	15	11	25	7	17	10	13	19	3	3	3	26
u	49	50	51	52	53	54	55	56	57	58	59	60
													S(u)	17	25	19	8	21	18	5	5	17	12	7	7
u	61	62	63	64	65	66	67	68	69	70	71	72
													S(u)	16	9	11	13	15	19	27	2	2	2	2	27
u	73	74	75	76	77	78	79	80	81	82	83	84
													S(u)	19	15	13	11	9	16	7	7	12	17	5	5
u	85	86	87	88	89	90	91	92	93	94	95	96
													S(u)	18	21	8	19	25	17	26	3	3	3	19	13
u	97	98	99	100	101	102	103	104	105	106	107	108
													S(u)	10	17	7	25	11	15	27	4	4	21	13	9
u	109	110	111	112	113	114	115	116	117	118	119	120
													S(u)	14	24	5	5	16	11	23	6	19	20	7	22
u	121	122	123	124	125	126	127	128	129	130	131	132
													S(u)	23	8	26	9	10	11	23	13	14	15	17	20
u	133	134	135	136	137	138
													S(u)	23	27	1	1	1	1

According to the cyclic shift N of the preamble sequence _CS And (5) dividing the ZC root sequence index into 12 groups according to the maximum value calculation result. Specific grouping condition and cyclic shift N of each group of preamble sequence _CS The common range of values for (2) is shown in table 18 below:

TABLE 18 leader sequence N _CS Maximum value grouping situation

Based on the grouping result, discarding the 1 st group and the preamble sequence cyclic shift N corresponding to the last 8 groups _CS Respectively selecting the cyclic shift N of the preamble sequence in the value range _CS The maximum value is formed into a preamble sequence cyclic shift quantity set {3,5,7,9,11,14,17,21}. Cyclic shift by preamble sequence by N _CS The cyclic shift amount N of each preamble sequence is respectively in the descending order of the values _CS Indexes 0-7 are allocated, and the final preamble cyclic shift amount set is shown in the following table 19:

table 19 preamble cyclic shift amount set

Detailed description eleven of the invention

On the basis of the third embodiment, the fourth embodiment and the tenth embodiment, the length N is adopted in the embodiment _ZC A cyclic shift sequence of ZC sequence=139 as a preamble sequence, when the random access channel subcarrier spacing is Δf=7.5 kHz or Δf=15 kHz or Δf=30 kHz or Δf=60 kHz or Δf=120 kHz, a preferred preamble sequence cyclic shift amount set configuration method specifically includes:

based on conditions such as cell coverage requirement and ZC sequence index value, and different frequency offset degrees are combined, respectively generating a preamble sequence cyclic shift amount set without frequency offset (or with frequency offset being negligible), with frequency offset degree being maximum 1 time of random access channel subcarrier interval size and frequency offset degree being maximum 2 times of random access channel subcarrier interval size, and finally generating the preamble sequence cyclic shift amount set as shown in table 20, wherein in table 20, set 2 represents the preamble sequence cyclic shift amount set under the condition that frequency offset degree is maximum 2 times of random access channel subcarrier interval size.

Table 20 preamble cyclic shift amount set

Detailed description of the invention twelve

when the length of ZC root sequence is N _ZC And when the root sequence index is u, the cyclic shift amount N of the preamble sequence _CS The maximum value of (2) is S (u). For the root sequence index u (u is not less than 1 and not more than 838) of ZC sequence, the cyclic shift N of the leading sequence is calculated _CS The maximum value S (u) is calculated as shown in table 21 below.

TABLE 21 cyclic shift amount N of preamble sequence _CS Maximum value S (u) of the values

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According to the cyclic shift N of the preamble sequence _CS And (5) dividing the ZC root sequence index into 14 groups according to the maximum value calculation result. Specific grouping condition and cyclic shift N of each group of preamble sequence _CS The common value ranges of (a) are shown in the following table 22:

table 22 cyclic shift amount N of preamble sequence _CS Maximum value grouping situation

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Based on the grouping result, discarding the 1 st group and the preamble sequence cyclic shift N corresponding to the last 13 groups _CS Respectively selecting the cyclic shift N of the preamble sequence in the value range _CS The maximum value is formed into a preamble sequence cyclic shift quantity set {17,20,24,28,34,40,48,57,70,84,100,116,138}. Cyclic shift by preamble sequence by N _CS The cyclic shift amount N of each preamble sequence is respectively in the descending order of the values _CS Indexes 0-12 are allocated, and the finally generated preamble sequence cyclic shift amount set is shown in the following table 23:

table 23 preamble cyclic shift amount set

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Detailed description of the preferred embodiments

Based on the above-described twelve embodiment, the present embodiment employs a length of N _ZC A cyclic shift sequence of ZC sequence=839 as a preamble sequence, when the random access channel subcarrier spacing is Δf=1.25 kHz or Δf=2.5 kHz or Δf=5 kHz, a preferred cyclic shift amount set configuration method for the preamble sequence specifically includes:

based on conditions such as cell coverage requirement and ZC sequence index value, and different frequency offset degrees, generating a preamble sequence cyclic shift amount set without frequency offset (or with frequency offset being negligible), with frequency offset degree being maximum 1 time random access channel subcarrier spacing size and frequency offset degree being maximum 2 times random access channel subcarrier spacing size respectively, wherein the finally generated preamble sequence cyclic shift amount set is shown in the following table 24, in the table 24, set 0 represents the preamble sequence cyclic shift amount set without frequency offset or with frequency offset being negligible, set 1 represents the preamble sequence cyclic shift amount set with frequency offset being maximum 1 time random access channel subcarrier spacing size, and set 2 represents the preamble sequence cyclic shift amount set with frequency offset degree being maximum 2 times random access channel subcarrier spacing size.

Table 24 preamble cyclic shift amount set

In addition, based on conditions such as cell coverage requirement and ZC sequence index value, and different frequency offset degrees, a preamble sequence cyclic shift amount set without frequency offset (or frequency offset can be ignored) and with a frequency offset degree of maximum 2 times of the subcarrier spacing size of the random access channel is generated respectively, and the finally generated preamble sequence cyclic shift amount set is shown in table 25, set 0 represents the preamble sequence cyclic shift amount set without frequency offset or frequency offset can be ignored, and set 1 represents the preamble sequence cyclic shift amount set with a frequency offset degree of maximum 2 times of the subcarrier spacing size of the random access channel.

Table 25 preamble cyclic shift amount set

Example IV

When the frequency offset is maximum 3 times of the subcarrier spacing of the random access channel, the preamble sequence of the random access process adopts the length of N _ZC The cyclic shift sequence of the ZC sequence of (a) is used as a preamble sequence, and the u (u is more than or equal to 1 and N is more than or equal to N) _ZC -1) root sequence is

Where u is the ZC sequence index.

Is a cyclic shift of (a); when the frequency offset degree is positive by 3 times of the subcarrier spacing size of the random access channel, the ZC sequence generates a size of +.>

Is a cyclic shift of (a); when the subcarrier spacing size of the random access channel with the frequency offset degree of negative 3 times, the ZC sequence generates the subcarrier spacing size of +.>

Is used for cyclic shift of (a).

During preamble sequence detection, the cyclic shift distortion will cause the power delay spectrum (Power Delay Profile, PDP) to generate false alarm peak value, and error cyclic shift pair occursThe window. As shown in fig. 11, in an actual system, positive 1-time, 2-time and 3-time frequency offset signals and negative 1-time, 2-time and 3-time frequency offset signals are all present, so that 6 error cyclic shift search windows occur. Wherein C is ₀ Representing the correct original cyclic shift search window, C _-1 Representing the error copy search window, C, caused by negative 1-fold frequency offset _-2 Representing the error copy search window, C, caused by negative frequency doubling offset 2 _-3 Representing the error copy search window, C, caused by negative 3-fold frequency offset ₊₁ Representing the error copy search window, C, caused by a positive 1-fold offset ₊₂ Representing the error copy search window, C, caused by a positive frequency offset of 2 ₊₃ Representing the error copy search window caused by the positive 3-fold frequency offset.

In this case, the cyclic shift amount N is such that cyclic shift of the same ZC sequence generates no interference between sequences _CS The following conditions need to be met: error search window C of any cyclic shift ZC sequence _-1 、C _-2 、C _-3 、C ₊₁ 、C ₊₂ And C ₊₃ Are not overlapped with each other and are cyclically shifted with C of ZC sequence _-1 、C _-2 、C _-3 、C ₀ 、C ₊₁ 、C ₊₂ And C ₊₃ Non-overlapping and correct with itself cyclic shift search window C ₀ Nor overlap. Definition of the definition

And is also provided with

And is also provided with

final preamble cyclic shift amount N _CS The conditions to be satisfied are

N _CS ≤d _u1 ≤(N _ZC -N _CS )/2

N _CS ≤d _u2 ≤(N _ZC -N _CS )/2

N _CS ≤d _u3 ≤(N _ZC -N _CS )/2

N _CS ≤|d _u1 -d _u2 |

N _CS ≤|d _u2 -d _u3 |

N _CS ≤|d _u3 -d _u1 |

In the above formula, d _u3 Representing the smaller of the cyclic shift sizes generated in the time domain by the ZC sequence when the frequency offset is positive by a factor of 3 and negative by a factor of 3 of the random access channel subcarrier spacing size.

The preamble sequence cyclic shift N is used for different cell coverage requirements _CS The conditions to be satisfied are the same as those described in the foregoing embodiment one.

Step D: based on N obtained in step C _ZC -1 preamble cyclic shift amount N _CS Dividing ZC sequence index u into Q groups (Q is less than or equal to P), and cyclic shift N of the corresponding preamble sequence of each group _CS Is close to the value range of (c) and the intersection of these value ranges is not an empty set. Combining different cell coverage requirements from each groupCommon preamble cyclic shift amount N _CS Selecting a cyclic shift N of the preamble sequence from the value range _CS Generating a preamble sequence cyclic shift quantity set finally containing Q elements, and respectively carrying out cyclic shift quantity N for each preamble sequence _CS A unique index is assigned. Wherein, the index numbers are 0 to Q-1.

Wherein, the cyclic shift N of the preamble sequence is divided into Q groups _CS A predetermined number of preamble sequences selected by the preamble sequence cyclic shift amount N _CS Specifically, zero cyclic shift N of preamble sequence is selected _CS Or at least one preamble cyclic shift amount N _CS 。

In the above embodiment, the following description will be made in detail with respect to several specific embodiments under the condition that the frequency offset is at most 3 times the subcarrier spacing size of the random access channel.

Detailed description of the preferred embodiments fourteen

when the length of ZC root sequence is N _ZC And when the root sequence index is u, the cyclic shift amount N of the preamble sequence _CS The maximum value of (2) is S (u). For the root sequence index u (u is more than or equal to 1 and less than or equal to 138) of ZC sequence, respectively calculating the cyclic shift N of the preamble sequence _CS The maximum value S (u) is calculated as shown in table 26 below.

Table 26 cyclic shift amount N of preamble sequence _CS Maximum value S (u) of the values

According to the cyclic shift N of the preamble sequence _CS And (5) dividing the ZC root sequence index into 8 groups according to the maximum value calculation result. Specific grouping condition and cyclic shift N of each group of preamble sequence _CS The common value ranges of (a) are shown in the following table 27:

TABLE 27 leader sequence N _CS Maximum value grouping situation

Based on the grouping result, discarding the 1 st group and the preamble sequence cyclic shift N corresponding to the 7 last groups _CS Respectively selecting the cyclic shift N of the preamble sequence in the value range _CS The maximum value is formed into a preamble sequence cyclic shift quantity set {3,5,7,9,11,13,16}. Cyclic shift by preamble sequence by N _CS The cyclic shift amount N of each preamble sequence is respectively in the descending order of the values _CS Indexes 0-6 are allocated, and the final set of cyclic shift amounts of the preamble sequence is shown in the following table 28:

table 28 preamble cyclic shift amount set

Description of the preferred embodiments fifteen

On the basis of the third embodiment, the fourth embodiment, the tenth embodiment and the fourteen embodiments, the length N is adopted in the embodiment _ZC A cyclic shift sequence of ZC sequence=139 as a preamble sequence, when the random access channel subcarrier spacing is Δf=7.5 kHz or Δf=15 kHz or Δf=30 kHz or Δf=60 kHz or Δf=120 kHz, a preferred preamble sequence cyclic shift amount set configuration method specifically includes:

based on conditions such as cell coverage requirement and ZC sequence index value, and different frequency offset degrees, generating a preamble sequence cyclic shift amount set without frequency offset (or with frequency offset negligible), with frequency offset degree maximum 1 time random access channel subcarrier spacing size, frequency offset degree maximum 2 times random access channel subcarrier spacing size and frequency offset degree maximum 3 times random access channel subcarrier spacing size respectively, wherein the finally generated preamble sequence cyclic shift amount set is shown in table 29, and in table 29, set 3 represents the preamble sequence cyclic shift amount set under the condition that the frequency offset degree maximum 3 times random access channel subcarrier spacing size.

Table 29 preamble cyclic shift amount set

Description of the preferred embodiments sixteen

when the length of ZC root sequence is N _ZC And when the root sequence index is u, the cyclic shift amount N of the preamble sequence _CS The maximum value of (2) is S (u). For the root sequence index u (u is not less than 1 and not more than 838) of ZC sequence, the cyclic shift N of the leading sequence is calculated _CS The maximum value S (u) is calculated as shown in table 30 below.

Table 30 cyclic shift amount N of preamble sequence _CS Maximum value S (u) of the values

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According to the cyclic shift N of the preamble sequence _CS And (5) dividing the ZC root sequence index into 13 groups according to the maximum value calculation result. Specific grouping condition and cyclic shift N of each group of preamble sequence _CS The common value ranges of (a) are shown in the following table 31:

table 31 cyclic shift amount N of preamble sequence _CS Maximum value grouping situation

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Based on the grouping result, discarding the 1 st group and the preamble sequence cyclic shift N corresponding to the last 12 groups _CS Respectively selecting the cyclic shift N of the preamble sequence in the value range _CS The maximum value is formed into a preamble sequence cyclic shift quantity set {19,22,26,30,36,42,50,59,68,78,89,102}. Cyclic shift by preamble sequence by N _CS The cyclic shift amount N of each preamble sequence is respectively in the descending order of the values _CS Indexes 0-12 are allocated, and the final generated preamble sequence cyclic shift amount set is shown in the following table 32:

Table 32 preamble cyclic shift amount set

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Seventeen embodiments

based on conditions such as cell coverage requirement and ZC sequence index value, and the like, in combination with different frequency offset degrees, a preamble sequence cyclic shift amount set without frequency offset (or with frequency offset negligible), with frequency offset degree maximum of 1 time random access channel subcarrier spacing size and frequency offset degree maximum of 2 times random access channel subcarrier spacing size is generated respectively, and the finally generated preamble sequence cyclic shift amount set is shown in the following table 33, in the table 33, set 0 represents the preamble sequence cyclic shift amount set without frequency offset or with frequency offset negligible, set 1 represents the preamble sequence cyclic shift amount set with frequency offset maximum of 1 time random access channel subcarrier spacing size, set 2 represents the preamble sequence cyclic shift amount set with frequency offset degree maximum of 2 times random access channel subcarrier spacing size, and set 3 represents the preamble sequence cyclic shift amount set with frequency offset degree maximum of 3 times random access channel subcarrier spacing size.

Table 33 preamble cyclic shift amount set

Based on the above steps 1-3, the present invention provides a method for determining cyclic shift amount of a preamble sequence, as shown in fig. 12, the method is applied to a user terminal, and the user terminal stores a cyclic shift amount set of the cyclic shift amount of the preamble sequence in advance, and includes the following steps:

step 1201, receiving a system information block sent by a base station.

And after receiving the system information block, acquiring a first index carried in the system information block.

Receiving a system information block sent by a base station, and acquiring a first index carried in the system information block, wherein the method specifically comprises the following steps:

receiving at least one system information block sent by a base station;

The preset condition is that the synchronous signal block with the maximum signal strength is preferentially selected, and each synchronous signal block carries at least one system information block.

Or, the preset condition is that the first received synchronization signal block is selected, and each synchronization signal block carries at least one system information block.

Of course, the specific content of the preset condition is not limited to the two types mentioned above, and any related manner including any one of the two specific content of the preset condition is within the scope of the present invention.

Step 1202, determining a preamble sequence cyclic shift amount N corresponding to a first index _CS 。

Wherein each preamble sequence is cyclically shifted by an amount N _CS Corresponding to a first index.

In this step, the following cases may be specifically included:

one) each preamble sequence cyclic shift amount set corresponds to a second index, and the preamble sequence cyclic shift amount N corresponding to the first index is selected from the pre-stored preamble sequence cyclic shift amount sets according to the first index _CS Comprising:

acquiring a second index carried in the system information block;

In the one), specifically, it includes:

1) When the number of pre-stored preamble sequence cyclic shift amount sets is at least two, selecting a preamble sequence cyclic shift amount N corresponding to the first index from the pre-stored preamble sequence cyclic shift amount sets according to the first index and the second index _CS Comprising:

Selecting the first index from the preamble sequence cyclic shift amount set corresponding to the second indexCyclic shift N of preamble sequence corresponding to an index _CS 。

2) When the number of pre-stored preamble sequence cyclic shift amount sets is at least two, selecting a preamble sequence cyclic shift amount N corresponding to the first index from the pre-stored preamble sequence cyclic shift amount sets according to the first index and the second index _CS Comprising:

If based on the selected preamble sequence cyclic shift N _CS And the initial preamble physical root sequence index cannot generate any sequence, the cyclic shift N of the preamble sequence is redetermined _CS =0; otherwise, maintaining the cyclic shift N of the selected preamble sequence _CS Is unchanged.

3) When the pre-stored preamble sequence cyclic shift amount set is one, selecting a preamble sequence cyclic shift amount N corresponding to the first index from the pre-stored preamble sequence cyclic shift amount set according to the first index and the second index _CS Comprising:

Second), when the pre-stored preamble sequence cyclic shift amount set is one, selecting a preamble sequence cyclic shift amount N corresponding to the first index from the pre-stored preamble sequence cyclic shift amount set according to the first index _CS Comprising:

if the system information block carries direct configuration preamble sequence cyclic shiftBit amount N _CS Determining an indication of a cyclic shift amount N of the preamble sequence _CS =0; otherwise, selecting a preamble sequence cyclic shift amount N corresponding to the first index from a pre-stored preamble sequence cyclic shift amount set according to the first index _CS 。

Third), when the pre-stored preamble sequence cyclic shift amount set is one, the system information block carries an indication of directly configuring the preamble sequence cyclic shift amount, and the preamble sequence cyclic shift amount N corresponding to the first index is selected from the pre-stored preamble sequence cyclic shift amount set according to the first index _CS The method specifically comprises the following steps:

The preamble sequence cyclic shift amount determination method provided by the present invention is specifically described below in several embodiments.

Example five

In this embodiment, as shown in the following table 34, a set example of cyclic shift amounts of all preamble sequences generated is given. In this table 34, the number of preamble cyclic shift amount sets is 4, and the preamble cyclic shift amount N in each set _CS The number of elements is at most 16. In this case, the index number of the preamble cyclic shift amount set is 0-3 (2-bit information), and the preamble cyclic shift amount N _CS The index of the configuration is 0-15 (4-bit information).

Table 34 preamble cyclic shift amount set

In combination with table 34, the cyclic shift amount N of the preamble sequence in the embodiment of the present invention _CS In the determination method of (1), theBase station transmits random access preamble cyclic shift amount N contained in system information block _CS The zeroCorrelation ZoneConfig is configured as 4-bit information, and the value range is 0-15; the index CyclicShift SetIndex of the cyclic shift quantity set of the preamble sequence contained in the system information block is 2-bit information, and the value range is 0-3.

Wherein, the cyclic shift amount N of the preamble sequence _CS When the configured index zerocorerelationship zoneconfig is 13, the index cyclicdevetsetindex of the preamble sequence cyclic shift quantity set cannot be 3; cyclic shift amount N of preamble sequence _CS When the configured index zerocorerelationship zoneconfig is 14, the index cyclicsetindex of the preamble sequence cyclic shift quantity set cannot be 2 or 3; cyclic shift amount N of preamble sequence _CS When the configured index zerocorerelationship zoneconfig is 15, the index cyclicdevetsetindex of the preamble cyclic shift amount set cannot be 1, 2 or 3.

The specific preamble sequence cyclic shift amount determining method is as follows:

step 1: the base station transmits a system information block containing a cyclic shift N of the random access preamble sequence _CS The index of the configured index and the index of the preamble sequence cyclic shift quantity set; the user terminal receives the system information block and reads the cyclic shift N of the preamble sequence contained in the system information block _CS The index of the configuration and the index of the preamble cyclic shift amount set.

Step 2: the user terminal selects a corresponding preamble sequence cyclic shift amount set from all preamble sequence cyclic shift amount sets based on the index of the preamble sequence cyclic shift amount set received in step 1.

Step 3: the user terminal cyclic shift amount N based on the random access preamble sequence received in step 1 _CS The configured index determines the final preamble cyclic shift amount N from the preamble cyclic shift amount set selected in step 2 _CS 。

It should be noted that the above scheme can be adjusted as follows:

step 1: the base station transmits system information block including leading root sequence logic index and followingCyclic shift N of the access preamble sequence _CS The index of the configured index and the index of the preamble sequence cyclic shift quantity set; the user terminal receives the system information block and reads the logic index of the preamble root sequence contained in the system information block and the cyclic shift quantity N of the preamble sequence _CS The index of the configuration and the index of the preamble cyclic shift amount set.

Step 2: the user terminal determines a corresponding initial preamble root sequence physical index u based on the initial preamble root sequence logical index received in step 1.

Step 3: the user terminal selects a corresponding preamble sequence cyclic shift amount set from all preamble sequence cyclic shift amount sets based on the index of the preamble sequence cyclic shift amount set received in step 1.

Step 4: the user terminal cyclic shift amount N based on the random access preamble sequence received in step 1 _CS The configured index selects a preamble cyclic shift N from the preamble cyclic shift set selected in step 2 _CS 。

Step 5: if the index CyclicShift SetIndex of the preamble sequence cyclic shift amount set is 1 or 2, and based on the initial preamble root sequence physical index u in step 2 and the preamble sequence cyclic shift amount N determined in step 4 _CS Failing to generate any preamble sequence, N is determined _CS =0; otherwise, maintaining the cyclic shift amount N of the preamble sequence determined in step 4 _CS Is unchanged.

It should be noted that the steps in the method for determining the cyclic shift amount of the preamble sequence are also applicable to multi-beam operation. As shown in table 34, in the above step 1, the base station may transmit the preamble sequence cyclic shift N with different length of 4 bits on different beams according to different cell coverage requirements corresponding to different beams _CS The system information block of the index and the index of the 2-bit preamble cyclic shift amount set is configured. If the user terminal detects the system information block in at least one synchronous signal block, the user terminal selects the system information block in one synchronous signal block according to the maximum receiving intensity, the first receiving or other criteria, and reads the cyclic shift N of the preamble sequence _CS Configured ropeIndex of the cyclic shift amount set of the leading and the leading sequences.

Example six

In this embodiment, as shown in the following table 35, a set example of cyclic shift amounts of all preamble sequences generated is given. In this table 35, the number of preamble cyclic shift amount sets is 3, and the preamble cyclic shift amount N in each set _CS The number of elements is at most 16. In this case, the index number of the preamble cyclic shift amount set is 0-2 (2-bit information), and the preamble cyclic shift amount N _CS The index of the configuration is 0-15 (4-bit information).

Table 35 preamble cyclic shift amount set

In combination with table 35, the cyclic shift amount N of the preamble sequence in the embodiment of the present invention _CS In the determining method of (1), the base station transmits a random access preamble cyclic shift amount N contained in a system information block _CS The zeroCorrelation ZoneConfig is configured as 4-bit information, and the value range is 0-15; the index CyclicShift SetIndex of the cyclic shift quantity set of the preamble sequence contained in the system information block is 2-bit information, and the value range is 0-2.

Wherein, the cyclic shift amount N of the preamble sequence _CS When the configured index zerocorerelationship zoneconfig is 14, the index cyclicsetindex of the preamble sequence cyclic shift quantity set cannot be 2; cyclic shift amount N of preamble sequence _CS When the configured index zerocorerelationship zoneconfig is 15, the index cyclicsetindex of the preamble cyclic shift amount set cannot be 1 or 2.

step 1: the base station transmits a system information block containing a cyclic shift N of the random access preamble sequence _CS The index of the configured index and the index of the preamble sequence cyclic shift quantity set; the user terminal receives the system information block and reads the cyclic shift amount of the preamble sequence contained in the system information blockN _CS The index of the configuration and the index of the preamble cyclic shift amount set.

It should be noted that the above scheme can be adjusted as follows:

step 1: the base station transmits a system information block comprising a preamble root sequence logical index and a random access preamble sequence cyclic shift N _CS The index of the configured index and the index of the preamble sequence cyclic shift quantity set; the user terminal receives the system information block and reads the logic index of the preamble root sequence contained in the system information block and the cyclic shift quantity N of the preamble sequence _CS The index of the configuration and the index of the preamble cyclic shift amount set.

It should be noted that the steps in the method for determining the cyclic shift amount of the preamble sequence are also applicable to multi-beam operation. As shown in table 35, in the above step 1, the base station may transmit the preamble sequence cyclic shift N with different length of 4 bits on different beams according to different cell coverage requirements corresponding to different beams _CS The system information block of the index and the index of the 2-bit preamble cyclic shift amount set is configured. If the user terminal detects the system information block in at least one synchronous signal block, the user terminal selects the system information block in one synchronous signal block according to the maximum receiving intensity, the first receiving or other criteria, and reads the cyclic shift N of the preamble sequence _CS The index of the configuration and the index of the preamble cyclic shift amount set.

Example seven

In this embodiment, as shown in the following table 36, a set example of cyclic shift amounts of all preamble sequences generated is given. In this table 36, the number of preamble cyclic shift amount sets is 2, and the preamble cyclic shift amount N in each set _CS The number of elements is at most 16. In this case, the index number of the preamble cyclic shift amount set is 0-1 (1-bit information), and the preamble cyclic shift amount N _CS The index of the configuration is 0-15 (4-bit information).

Table 36 preamble cyclic shift amount set

In combination with table 36, the cyclic shift amount N of the preamble sequence in the embodiment of the present invention _CS In the determining method of (1), the base station transmits a random access preamble cyclic shift amount N contained in a system information block _CS The zeroCorrelation ZoneConfig is configured as 4-bit information, and the value range is 0-15; index CyclicShift SetIndex of cyclic shift amount set of preamble sequence simultaneously contained in system information block is 1-bit informationThe value range is 0-1.

Wherein, the cyclic shift amount N of the preamble sequence _CS When the configured index zerocorerelationship zoneconfig is 15, the index cyclicdevetsetindex of the preamble cyclic shift amount set cannot be 1.

Step 5: if the index CyclicShift SetIndex of the preamble sequence cyclic shift amount set is 1, and based on the initial preamble root sequence physical index u in step 2 and the preamble sequence cyclic shift amount N determined in step 4 _CS Failing to generate any preamble sequence, N is determined _CS =0; otherwise, maintaining the cyclic shift amount N of the preamble sequence determined in step 4 _CS Is unchanged.

It should be noted that the steps in the method for determining the cyclic shift amount of the preamble sequence are also applicable to multi-beam operation. As shown in table 36, in the above step 1, the base station can cover different cells corresponding to different beams The requirement is that the cyclic shift amount N of the preamble sequence with different length of 4 bits is transmitted on different beams _CS The system information block of the index and the index of the 1-bit preamble cyclic shift amount set is configured. If the user terminal detects the system information block in at least one synchronous signal block, the user terminal selects the system information block in one synchronous signal block according to the maximum receiving intensity, the first receiving or other criteria, and reads the cyclic shift N of the preamble sequence _CS The index of the configuration and the index of the preamble cyclic shift amount set.

Example eight

In the present embodiment, as shown in the following table 37, only 1 preamble sequence cyclic shift amount set is generated. Cyclic shift amount N of preamble sequence in the set _CS The number of elements is P. In this case the preamble sequence is cyclically shifted by an amount N _CS The index of the configuration is 0 to P-1.

Table 37 preamble cyclic shift amount set

N _CS Configuration of	N _CS Value taking
		0	N ₀
1	N ₁
		2	N ₂
…
		P-1	N _P-1

In combination with table 37, the cyclic shift amount N of the preamble sequence in the embodiment of the present invention _CS The determination method of (2) is as follows:

step 1: the base station transmits a system information block containing a cyclic shift N of the random access preamble sequence _CS The index of the configuration and the index of the preamble sequence cyclic shift quantity set; the user terminal receives the system information block and reads the cyclic shift N of the preamble sequence contained in the system information block _CS The index of the configuration and the index of the preamble cyclic shift amount set.

Step 2: the user terminal makes the following selection based on the index of the preamble sequence cyclic shift amount set received in step 1: if the index of the preamble sequence cyclic shift amount set is not 0, determining N _CS =0; if the index of the cyclic shift amount set of the preamble sequence is 0, step 3 is performed.

Step 3: if the index of the preamble cyclic shift amount set received by the user terminal in step 1 is 0, the preamble cyclic shift amount N received in step 1 is based on _CS The configured index determines a final preamble cyclic shift amount N in the preamble cyclic shift amount set _CS 。

In addition, the cyclic shift amount N of the preamble sequence is as follows _CS The steps in the determination method of (2) are equally applicable to multi-beam operation. As shown in table 37, in the above step 1, the base station may transmit a signal containing different cyclic shift amounts N of the preamble sequence on different beams according to different cell coverage requirements corresponding to the different beams _CS And configuring the indexed system information block. If the user terminal detects the system information block in at least one synchronous signal block, the user terminal selects the system information block in one synchronous signal block according to the maximum receiving intensity, the first receiving or other criteria, and reads the cyclic shift N of the preamble sequence _CS Index and preamble of configuration N _CS Index of the collection.

Example nine

In the present embodiment, as shown in the following table 38, only 1 preamble sequence cyclic shift amount set is generated. Cyclic shift amount N of preamble sequence in the set _CS The number of elements is P. In this case the preamble sequence is cyclically shifted by an amount N _CS The index of the configuration is 0 to P-1.

Table 38 preamble cyclic shift amount set

In combination with table 38, the cyclic shift amount N of the preamble sequence in the embodiment of the present invention _CS The determination method of (2) is as follows:

step 1: the base station transmits a system information block containing a cyclic shift N of the random access preamble sequence _CS Index of configuration. In addition, the system information block may further include a direct configuration preamble cyclic shift N _CS Is an indication of (a). The user terminal receives the system information block and reads the cyclic shift N of the preamble sequence contained in the system information block _CS Index of configuration and direct configuration preamble cyclic shift amount N possibly contained _CS Is an indication of (a).

Step 2: the user terminal configures the preamble sequence cyclic shift amount N directly based on the index of the preamble sequence cyclic shift amount set received in step 1 and the possible received preamble sequence cyclic shift amount N directly _CS Is selected as follows: if a direct configuration preamble sequence cyclic shift N is received _CS Is to determine the cyclic shift amount N of the preamble sequence _CS =0; if the direct configuration preamble sequence cyclic shift N is not received _CS If so, step 3 is performed.

Step 3: if the ue does not receive the direct configuration preamble cyclic shift N in step 1 _CS Based on the preamble cyclic shift amount N received in step 1) _CS The configured index determines a final preamble cyclic shift amount N in the preamble cyclic shift amount set _CS 。

In addition, the cyclic shift amount N of the preamble sequence is as follows _CS The steps in the determination method of (2) are equally applicable to multi-beam operation. As shown in table 38, in step 1, the base station may transmit a signal containing different cyclic shift amounts N of the preamble sequence on different beams according to different cell coverage requirements corresponding to the different beams _CS Configuration index and different direct configuration preamble cyclic shift amounts N _CS System information block indicating presence. If the user terminal detects the system information block in at least one synchronous signal block, the user terminal selects the system information block in one synchronous signal block according to the maximum receiving intensity, the first receiving or other criteria, and reads the cyclic shift N of the preamble sequence _CS Index of configuration and direct configuration preamble cyclic shift amount N possibly contained _CS Is an indication of (a).

Examples ten

In the present embodimentAs shown in table 39 below, only 1 preamble cyclic shift amount set is generated. Cyclic shift amount N of preamble sequence in the set _CS The number of elements is P. In this case the preamble sequence is cyclically shifted by an amount N _CS The index of the configuration is 0 to P-1.

Table 39 preamble cyclic shift amount set

N _CS Configuration of	N _CS Value taking
		0	N ₀
1	N ₁
		2	N ₂
…	…
		P-1	N _P-1

In combination with table 39, the cyclic shift amount N of the preamble sequence in the embodiment of the present invention _CS The determination method of (2) is as follows:

step 1: the base station transmits a system information block containing a cyclic shift N of the random access preamble sequence _CS Configured index and direct configuration preamble cyclic shift amount N _CS Is an indication of (a). The user terminal receives the system information block and readsThe cyclic shift amount N of the preamble sequence contained therein _CS Configured index and direct configuration preamble cyclic shift amount N _CS Is an indication of (a).

Step 2: the user terminal configures the preamble sequence cyclic shift amount N directly based on the index of the preamble sequence cyclic shift amount set received in step 1 and the possible received preamble sequence cyclic shift amount N directly _CS Is selected as follows: if a direct configuration preamble sequence cyclic shift N is received _CS Is 1, then the cyclic shift amount N of the preamble sequence is determined _CS =0; if a direct configuration preamble sequence cyclic shift N is received _CS If the instruction of (2) is not 1, step 3 is performed.

Step 3: if the user terminal receives the direct configuration preamble sequence cyclic shift N in step 1 _CS Is not 1, based on the preamble cyclic shift amount N received in step 1 _CS The configured index determines a final preamble cyclic shift amount N in the preamble cyclic shift amount set _CS 。

In addition, the cyclic shift amount N of the preamble sequence is as follows _CS The steps in the determination method of (2) are equally applicable to multi-beam operation. As shown in table 39, in the above step 1, the base station may transmit a signal containing different cyclic shift amounts N of the preamble sequence on different beams according to different cell coverage requirements corresponding to the different beams _CS Configured index and direct configuration preamble cyclic shift amount N _CS Indicated system information block of (c). If the user terminal detects the system information block in at least one synchronous signal block, the user terminal selects the system information block in one synchronous signal block according to the maximum receiving intensity, the first receiving or other criteria, and reads the cyclic shift N of the preamble sequence _CS Configured index and direct configuration preamble cyclic shift amount N _CS Is an indication of (a).

The preamble sequence generation method provided by the present invention is specifically described below in several embodiments.

Example eleven

This embodiment describes a method for supporting a maximum of 2 times the frequency offset of the random access channel subcarriers in the systemInterval size and determining cyclic shift N of preamble sequence _CS And (3) a method for generating a leader sequence under the condition of not being 0.

The preamble sequence of random access process adopts a length of N _ZC The cyclic shift sequence of the ZC sequence of (a) is used as a preamble sequence, and the u (u is more than or equal to 1 and N is more than or equal to N) _ZC -1) root sequence is

Where u is the root sequence physical index of the ZC sequence. Definition of the definition

And is also provided with

further definition of

d _max ＝max(d _u1 ,d _u2 )

d _min ＝min(d _u1 ,d _u2 )

The specific leader sequence generation steps are as follows:

step 1: the terminal determines a preamble sequence cyclic shift amount N that is not 0 _CS And determining a corresponding initial physical root sequence index u based on the initial root sequence logic index transmitted by the base station, and determining the number M of the preamble sequences to be generated.

Step 2: for the physical root sequence index u, ZCZ (Zero Correlation Zone) length N is generated by _ZC Is a cyclic shift ZC sequence of (c)

x _u,v (n)＝x _u ((n+C _v )modN _ZC )

Wherein the absolute cyclic shift amount C _v Can be expressed as

The relevant parameters may be further expressed as

(1) If N _CS ≤d _min ≤d _max ≤N _ZC 3, then

(2) If N _ZC /3≤d _min ≤d _max ≤(N _ZC -N _CS ) /2, then

(3) If N _CS ≤d _min <N _CS /3<d _max ≤(N _ZC -N _CS ) /2, then

If it is

Then->

If it is

Then->

For the same physical root sequence index u, based on different C _v The value is used to generate all the leading sequences of the root sequence (if based on the physical root sequence index u, the cyclic shift N of the leading sequences _CS And if the above formula cannot generate any preamble sequence, skipping the physical root sequence index u, and executing step 3).

Step 3: and adding 1 to the logical root sequence index, updating the corresponding physical root sequence index u, and repeating the step 2 until M preamble sequences are generated in total.

Example twelve

The embodiment describes a method for supporting the subcarrier spacing of a random access channel with a frequency offset of 2 times at maximum in a system and determining the cyclic shift N of a preamble sequence _CS Under the conditions of (2) a method for generating a leader sequence.

In this embodiment, as shown in the following table 40, the number of cyclic shift amount sets of the preamble sequence is 2. The final used set is indicated by the index CyclicShift SetIndex of the preamble cyclic shift amount set sent by the base station. The index CyclicShift SetIndex of the cyclic shift quantity set of the preamble sequence is 1 bit information, and the value range is 0-1.

Table 40 preamble cyclic shift amount set

And is also provided with

further definition of

d _max ＝max(d _u1 ,d _u2 )

d _min ＝min(d _u1 ,d _u2 )

The specific leader sequence generation steps are as follows:

step 1: terminal determines cyclic shift amount N of preamble sequence _CS And determining a corresponding initial physical root sequence index u based on the initial root sequence logic index transmitted by the base station, and determining the number M of the preamble sequences to be generated.

x _u,v (n)＝x _u ((n+C _v )modN _ZC )

Wherein the absolute cyclic shift amount C _v Can be expressed as

For cyclicshiftsetindex=1, the relevant parameters can be further expressed as

(1) If N _CS ≤d _min ≤d _max ≤N _ZC 3, then

(2) If N _ZC /3≤d _min ≤d _max ≤(N _ZC -N _CS ) /2, then

(3) If N _CS ≤d _min <N _CS /3<d _max ≤(N _ZC -N _CS ) /2, then

If it is

Then->

If it is

Then->

For the same physical root sequence index u, based on different C _v The values are obtained by generating all the leading sequences of the root sequence (if based on the index u, the leading sequence of the physical root sequenceCyclic shift amount N of pilot sequence _CS And if the above formula cannot generate any preamble sequence, skipping the physical root sequence index u, and executing step 3).

Example thirteen

In this embodiment, as shown in table 41 below, the number of cyclic shift amount sets of the preamble sequence is 3. The final used set is indicated by the index CyclicShift SetIndex of the preamble cyclic shift amount set sent by the base station. The index CyclicShift SetIndex of the cyclic shift quantity set of the preamble sequence is 2-bit information, and the value range is 0-2.

Table 41 preamble cyclic shift amount set

And is also provided with

further definition of

d _max ＝max(d _u1 ,d _u2 )

d _min ＝min(d _u1 ,d _u2 )

The specific leader sequence generation steps are as follows:

x _u,v (n)＝x _u ((n+C _v )modN _ZC )

Wherein the absolute cyclic shift amount C _v Can be expressed as

For cyclicshiftsetindex=1, the relevant parameters can be further expressed as

(1) If N _CS ≤d _u1 <N _ZC 3, then

(2) If N _ZC /3≤d _u1 ≤(N _ZC -N _CS ) /2, then

For cyclicshiftsetindex=2, the relevant parameters can be further expressed as

(1) If N _CS ≤d _min ≤d _max ≤N _ZC 3, then

(2) If N _ZC /3≤d _min ≤d _max ≤(N _ZC -N _CS ) /2, then

(3) If N _CS ≤d _min <N _CS /3<d _max ≤(N _ZC -N _CS ) /2, then

/>

If it is

Then->

If it is

Then->

Examples fourteen

The embodiment describes a method for supporting the subcarrier spacing of a random access channel with a frequency offset of 1 or 2 times at maximum in a system and determining the cyclic shift N of a preamble sequence _CS And (3) a method for generating a leader sequence under the condition of not being 0.

In this embodiment, as shown in table 41 below, the number of elements of the preamble restriction set is P. N (N) _CS Is taken from (a)The value is indicated by the index zerocorerelation zoneconfig configured by the cyclic shift amount of the preamble sequence and the system predefines a threshold T. Wherein the index zerocorerelation zoneconfig of the cyclic shift configuration of the preamble sequence is one

Bit information, the value range is 0- (P-1); the threshold T is in the range of 0<T≤P-1。

TABLE 41 set of preamble cyclic shifts (restriction set)

And is also provided with

further definition of

d _max ＝max(d _u1 ,d _u2 )

d _min ＝min(d _u1 ,d _u2 )

The specific leader sequence generation steps are as follows:

x _u,v (n)＝x _u ((n+C _v )modN _ZC )

Wherein the absolute cyclic shift amount C _v Can be expressed as

If zeroCorrelation ZoneConfig < T, the relevant parameters can be further expressed as

(1) If N _CS ≤d _u1 <N _ZC 3, then

(2) If N _ZC /3≤d _u1 ≤(N _ZC -N _CS ) /2, then

If zeroCorrelation ZoneConfig is greater than or equal to T, then the relevant parameters may be further expressed as

(1) If N _CS ≤d _min ≤d _max ≤N _ZC 3, then

(2) If N _ZC /3≤d _min ≤d _max ≤(N _ZC -N _CS ) /2, then

(3) If N _CS ≤d _min <N _CS /3<d _max ≤(N _ZC -N _CS ) /2, then

If it is

Then->

If it is

Then->

Example fifteen

In this embodiment, as shown in table 41 below, the number of elements of the preamble restriction set is P. N (N) _CS Indicated by the index zerocorerelation con config configured by the cyclic shift amount of the preamble sequence and a threshold T is predefined by the system. Wherein the index zerocorerelation zoneconfig of the cyclic shift configuration of the preamble sequence is one

TABLE 41 set of preamble cyclic shifts (restriction set)

And is also provided with

further definition of

d _max ＝max(d _u1 ,d _u2 )

d _min ＝min(d _u1 ,d _u2 )

The specific leader sequence generation steps are as follows:

step 1: the terminal determines a preamble sequence cyclic shift amount N that is not 0 _CS And determining a corresponding initial physical root sequence based on the initial root sequence logic index transmitted by the base stationIndex u, and determine the number of preamble sequences M that need to be generated.

x _u,v (n)＝x _u ((n+C _v )modN _ZC )

Wherein the absolute cyclic shift amount C _v Can be expressed as

If zeroCorrelation ZoneConfig > T, then the relevant parameters may be further expressed as

1) If N _CS ≤d _u1 <N _ZC 3, then

(2) If N _ZC /3≤d _u1 ≤(N _ZC -N _CS ) /2, then

/>

If zeroCorrelation ZoneConfig is less than or equal to T, the relevant parameters may be further expressed as

(1) If N _CS ≤d _min ≤d _max ≤N _ZC 3, then

(2) If N _ZC /3≤d _min ≤d _max ≤(N _ZC -N _CS ) /2, then

(3) If N _CS ≤d _min <N _CS /3<d _max ≤(N _ZC -N _CS ) /2, then

If it is

Then->

If it is

Then->

Based on the specific embodiment disclosed in the invention, the invention also provides a preamble sequence cyclic shift amount set configuration device, as shown in fig. 13, which comprises:

a first processing unit 1301 configured to determine a cyclic shift amount N of the preamble sequence according to the ZC sequence and the frequency offset degree _CS All values are taken;

a second processing unit 1302 for cyclically shifting an amount N in the preamble sequence _CS Selecting a preset number of cyclic shift N of the preamble sequence from all values _CS Generating a cyclic shift quantity set of the preamble sequence;

and the sending unit 1303 is configured to send the generated cyclic shift amount set of the preamble sequence to the base station and the user terminal for storing, respectively.

Based on the specific embodiment disclosed in the invention, the invention also provides a preamble sequence cyclic shift amount determining device, in which a preamble sequence cyclic shift amount set is stored in advance, as shown in fig. 14, the determining device includes:

A first processing unit 1401, configured to receive a system information block sent by a base station, and obtain a first index carried in the system information block;

a second processing unit 1402, configured to select, according to the first index, a preamble sequence cyclic shift amount N corresponding to the first index from a pre-stored preamble sequence cyclic shift amount set _CS 。

The invention provides a preamble sequence cyclic shift amount set configuration method aiming at a 5G wireless communication system. Different sets of cyclic shift amounts of the preamble sequence correspond to different degrees of frequency offset, and specific values of cyclic shift amounts of the preamble sequence in each set of cyclic shift amounts of the preamble sequence are determined according to relevant conditions such as the different degrees of frequency offset. In the random access process, a user receives a system information block sent by a base station and reads an index of cyclic shift quantity configuration and an index of a cyclic shift quantity set contained in the system information block. Finally, the user selects one set among all preamble sequence cyclic shift amount sets according to the index of the cyclic shift amount set, and then determines a final cyclic shift amount based on the index of the cyclic shift amount configuration in the selected cyclic shift amount set.

The invention provides a preamble sequence cyclic shift N _CS The determining method and the preamble sequence generating method can meet the requirements of complex and various coverage and the like of a 5G wireless communication system, reduce the intra-cell interference and inter-cell interference, and provide lower access delay and better access experience for users.

Those skilled in the art will appreciate that the present invention includes apparatuses related to performing one or more of the operations described herein. These devices may be specially designed and constructed for the required purposes, or may comprise known devices in general purpose computers. These devices have computer programs stored therein that are selectively activated or reconfigured. Such a computer program may be stored in a device (e.g., a computer) readable medium or any type of medium suitable for storing electronic instructions and respectively coupled to a bus, including, but not limited to, any type of disk (including floppy disks, hard disks, optical disks, CD-ROMs, and magneto-optical disks), ROMs (Read-Only memories), RAMs (Random AcceSS Memory, random access memories), EPROMs (EraSable Programmable Read-Only memories), EEPROMs (Electrically EraSable Programmable Read-Only memories), flash memories, magnetic cards, or optical cards. That is, a readable medium 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 can be implemented in a processor of a general purpose computer, special purpose computer, or other programmable data processing method, such that the blocks of the block diagrams and/or flowchart illustration are implemented by the processor of the computer or other programmable data processing method.

The modules of the device can be integrated into a whole or can be separately deployed. The modules can be combined into one module or further split into a plurality of sub-modules.

Those skilled in the art will appreciate that the drawing is merely a schematic representation of one preferred embodiment and that the modules or processes in the drawing are not necessarily required to practice the invention.

Those skilled in the art will appreciate that modules in an apparatus of an embodiment may be distributed in an apparatus of an embodiment as described in the embodiments, and that corresponding changes may be made in one or more apparatuses different from the present embodiment. The modules of the above embodiments may be combined into one module, or may be further split into a plurality of sub-modules.

The above-described inventive sequence numbers are merely for the purpose of description and do not represent the advantages or disadvantages of the embodiments.

The foregoing disclosure is merely illustrative of some embodiments of the invention, and it should be noted that modifications and enhancements can be made by those skilled in the art without departing from the principles of the present invention, any variations which fall within the purview of the present invention.

Claims

1. A preamble sequence cyclic shift amount determining method, applied to a user terminal, where the user terminal stores a preamble sequence cyclic shift amount set in advance, the determining method comprising:

selecting a preamble sequence cyclic shift amount N corresponding to the first index from a pre-stored preamble sequence cyclic shift amount set according to the first index _CS ；

Wherein the set of cyclic shift amounts of the preamble sequence is based on the cyclic shift amount N of the preamble sequence _CS Selecting a preset number of preamble sequence cyclic shift amounts N from all values _CS Generated, the cyclic shift amount N of the preamble sequence _CS Is determined based on the ZC sequence and the degree of frequency offset.

2. The method for determining the cyclic shift amount of the preamble sequence according to claim 1, wherein the receiving base station sends a system information block, and the obtaining the first index carried in the system information block specifically includes:

receiving at least one system information block sent by a base station;

3. The method for determining cyclic shift of preamble sequence according to claim 2, wherein the preset condition is to preferentially select a synchronization signal block with the largest signal strength, and each synchronization signal block carries at least one system information block.

4. The method for determining cyclic shift of preamble sequence according to claim 2, wherein the predetermined condition is to select a first received synchronization signal block, each synchronization signal block carrying at least one system information block.

5. The method for determining cyclic shift amount of preamble sequence according to claim 1 or 2, wherein each cyclic shift amount set of preamble sequence corresponds to a second index, and the cyclic shift amount N of preamble sequence corresponding to the first index is selected from the cyclic shift amount sets of preamble sequence stored in advance according to the first index _CS Comprising:

acquiring a second index carried in the system information block;

6. The method for determining cyclic shift amount of preamble sequence according to claim 5, wherein when there are at least two sets of cyclic shift amounts of preamble sequence stored in advance, the cyclic shift amount N of preamble sequence corresponding to the first index is selected from the sets of cyclic shift amounts of preamble sequence stored in advance according to the first index and the second index _CS Comprising:

7. The preamble of claim 5The method for determining the column cyclic shift amount is characterized in that when at least two pre-stored preamble sequence cyclic shift amount sets are provided, the preamble sequence cyclic shift amount N corresponding to the first index is selected from the pre-stored preamble sequence cyclic shift amount sets according to the first index and the second index _CS Comprising:

8. The method for determining cyclic shift amount of preamble sequence according to claim 5, wherein when the set of cyclic shift amounts of preamble sequence stored in advance is one, the cyclic shift amount N of preamble sequence corresponding to the first index is selected from the set of cyclic shift amounts of preamble sequence stored in advance based on the first index and the second index _CS Comprising:

when the second index is determined not to be 0, determining a preamble cyclic shift amount N _CS =0; otherwise, selecting a preamble sequence cyclic shift amount N corresponding to the first index from a pre-stored preamble sequence set according to the first index _CS 。

9. The preamble sequence cyclic shift amount determining method according to claim 1 or 2, wherein when the pre-stored preamble sequence cyclic shift amount set is one, the first index is used to determine the preamble sequence cyclic shift amount set in the pre-stored preamble sequence cyclic shift amount setIs selected to correspond to the first index _CS Comprising:

10. The method for determining cyclic shift amount of preamble sequence according to claim 1 or 2, wherein when the set of cyclic shift amounts of preamble sequence stored in advance is one, the system information block carries an indication of directly configuring cyclic shift amount of preamble sequence, and the cyclic shift amount N of preamble sequence corresponding to the first index is selected from the set of cyclic shift amounts of preamble sequence stored in advance according to the first index _CS The method specifically comprises the following steps:

if the indication of the cyclic shift amount of the direct configuration preamble sequence carried in the system information block is 1, determining the cyclic shift amount N of the preamble sequence _CS =0; otherwise, selecting a preamble sequence cyclic shift amount N corresponding to the first index from a pre-stored preamble sequence cyclic shift amount set according to the first index _CS 。

11. The preamble sequence cyclic shift amount determining method according to any one of claims 1 to 10, characterized in that each preamble sequence cyclic shift amount N _CS Corresponding to a first index.

12. A preamble sequence cyclic shift amount set configuration method, the method comprising:

cyclic shift amount N in the preamble sequence _CS Selecting a preset number of cyclic shift N of the preamble sequence from all values _CS Generating a preambleAnd the generated preamble sequence cyclic shift quantity set is respectively sent to at least one of the base station and the user terminal for storage.

13. The preamble sequence cyclic shift amount set configuration method according to claim 12, characterized in that the index number of the ZC sequence is u, u is 1-N _ZC -1, determining the cyclic shift N of the preamble sequence according to ZC sequence and frequency offset degree _CS All values, including:

and, at the preamble sequence cyclic shift amount N _CS Selecting a preset number of cyclic shift N of the preamble sequence from all values _CS Generating a preamble sequence cyclic shift amount set, comprising:

cyclic shift amount N of preamble sequence in each of Q groups _CS Respectively selecting a preset number of cyclic shift amounts of the preamble sequences from all values of the preamble sequences to generate a cyclic shift amount set of the preamble sequences;

wherein N is _ZC The length size of the ZC sequence is represented.

14. The preamble sequence cyclic shift amount set configuration method according to claim 13, wherein the preamble sequence cyclic shift amount N is set in each of Q groups _CS A predetermined number of preamble sequences selected by the preamble sequence cyclic shift amount N _CS Comprising selecting zero preamble sequence cyclic shift N _CS Or at least one preamble cyclic shift amount N _CS 。

15. The method of preamble sequence cyclic shift amount set configuration according to claim 13, wherein the frequency offset degree includes 1, 2 and 3 times a random access channel subcarrier spacing size, theThe cyclic shift N of the preamble sequence _CS The value range of the (C) is not more than the absolute value of the difference of the cyclic shift size generated by the ZC sequence in the time domain under any two frequency offset degrees.

16. The preamble sequence cyclic shift amount set configuration method according to claim 15, wherein the preamble sequence cyclic shift amount N when the frequency offset degree is at most 2 times a random access channel subcarrier spacing size _CS The range of the values of (a) specifically comprises:

N _CS ≤d _u1 ≤(N _ZC -N _CS )/2

N _CS ≤d _u2 ≤(N _ZC -N _CS )/2

N _CS ≤|d _u1 -d _u2 |

wherein d _u1 Representing the smaller value, d, in the cyclic shift size generated by ZC sequence in the time domain when the frequency offset degree is positive 1 times and negative 1 times of the subcarrier spacing size of the random access channel when the physical index of the root sequence of the preamble sequence is u _u2 Representing the smaller of the cyclic shift sizes generated in the time domain by the ZC sequence when the frequency offset is positive by a factor of 2 and negative by a factor of 2 random access channel subcarrier spacing size.

17. The method for configuring the cyclic shift amount set of a preamble sequence according to claim 16, wherein,

when the frequency offset degree is 3 times of the subcarrier spacing size of the random access channel, the cyclic shift amount N of the preamble sequence _CS The range of values of (2) further includes:

N _cs ≤d _uз ≤(N _zc -N _cs )/2

N _cs ≤│d _uз -d _u1 │

N _cs ≤│d _u2 -d _uз │

wherein d _uз ZC sequence in time domain when representing the subcarrier spacing size of the random access channel with positive 3 times and negative 3 times of the frequency offset degree The smaller of the cyclic shift sizes that result.

18. A preamble sequence cyclic shift amount determining apparatus, applied to a user terminal, having a preamble sequence cyclic shift amount set stored in advance, characterized in that the determining apparatus comprises:

a second processing unit, configured to select, from a pre-stored preamble sequence set, a preamble sequence cyclic shift amount N corresponding to the first index according to the first index _CS ；

19. The apparatus of claim 18, wherein the first processing unit is to:

receiving at least one system information block sent by a base station;

20. The apparatus of claim 19, wherein the predetermined condition is to preferentially select synchronization signal blocks with the greatest signal strength, each synchronization signal block carrying at least one system information block.

21. The apparatus of claim 19, wherein the predetermined condition is to select a first synchronization signal block received, each synchronization signal block carrying at least one system information block.

22. The apparatus of claim 18 or 19, wherein each set of preamble sequence cyclic shift amounts corresponds to a second index, the second processing unit being configured to:

acquiring a second index carried in the system information block;

23. The apparatus of claim 22, wherein the second processing unit selects a preamble sequence cyclic shift amount N corresponding to the first index from among a pre-stored set of preamble sequence cyclic shift amounts according to the first index and the second index when the pre-stored set of preamble sequence cyclic shift amounts is at least two _CS When used for:

24. The apparatus of claim 22, wherein the second processing unit selects a preamble sequence cyclic shift amount N corresponding to the first index from among a pre-stored set of preamble sequence cyclic shift amounts according to the first index and the second index when the pre-stored set of preamble sequence cyclic shift amounts is at least two _CS When used for:

selecting the preamble sequence cyclic shift amount set corresponding to the second index according to the first indexCyclic shift amount N of preamble sequence corresponding to the first index _CS ；

25. The apparatus of claim 22, wherein the second processing unit selects a preamble sequence cyclic shift amount N corresponding to the first index from among the pre-stored preamble sequence cyclic shift amount sets according to the first index and the second index when the pre-stored preamble sequence cyclic shift amount set is one _CS When used for:

26. The apparatus of claim 18 or 19, wherein the second processing unit is configured to, when the set of pre-stored preamble sequence cyclic shift amounts is one:

27. The apparatus of claim 18 or 19, wherein the system information block carries an indication of a direct configuration preamble sequence cyclic shift amount when the pre-stored preamble sequence cyclic shift amount set is one, the second processing unit being configured to, based on the first index, store the preamble sequence cyclic shift amount in the pre-stored preambleSelecting a preamble sequence cyclic shift N corresponding to the first index from a sequence cyclic shift set _CS When used for:

28. The apparatus of any one of claims 18-27, wherein each preamble sequence is cyclically shifted by an amount N _CS Corresponding to a first index.

29. A preamble sequence cyclic shift amount set configuration apparatus, the apparatus comprising:

and the sending unit is used for respectively sending the generated preamble sequence cyclic shift quantity set to at least one of the base station and the user terminal for storage.

30. The apparatus of claim 29, wherein the number of indexes of the ZC sequence is u, 1. Ltoreq.u.ltoreq.N _ZC -1, the first processing unit for:

and, the second processing unit is used for:

wherein N is _ZC The length size of the ZC sequence is represented.

31. The apparatus of claim 30, wherein the preamble sequences are cyclically shifted by an amount N in each of the Q groups _CS A predetermined number of preamble sequences selected by the preamble sequence cyclic shift amount N _CS Comprising selecting zero preamble sequence cyclic shift N _CS Or at least one preamble cyclic shift amount N _CS 。

32. The apparatus of claim 30, wherein the degree of frequency offset comprises 1, 2, and 3 times a random access channel subcarrier spacing size, the preamble sequence cyclic shift amount N _CS The value range of the (C) is not more than the absolute value of the difference of the cyclic shift size generated by the ZC sequence in the time domain under any two frequency offset degrees.

33. The apparatus of claim 32, wherein the preamble sequence cyclic shift amount N when the frequency offset is at most 2 times a random access channel subcarrier spacing size _CS The range of the values of (a) specifically comprises:

N _CS ≤d _u1 ≤(N _ZC -N _CS )/2

N _CS ≤d _u2 ≤(N _zc -N _CS )/2

N _CS ≤|d _u1 -d _u2 |

wherein d _u1 Representing the smaller value, d, in the cyclic shift size generated by ZC sequence in the time domain when the frequency offset degree is positive 1 times and negative 1 times of the subcarrier spacing size of the random access channel when the physical index of the root sequence of the preamble sequence is u _u2 Indicating a positive 2 times and a negative 2 times random access channel at said frequency offset levelThe ZC sequence is a smaller value in the cyclic shift size generated in the time domain when the subcarrier spacing size is small.

34. The apparatus of claim 33, wherein the device comprises a plurality of sensors,

N _cs ≤d _uз ≤(N _zc -N _cs )/2

N _cs ≤│d _uз -d _u1 │

N _cs ≤│d _u2 -d _uз │

wherein d _uз Representing the smaller value of the cyclic shift size generated by the ZC sequence in the time domain when the frequency offset degree is positive 3 times and negative 3 times of the subcarrier spacing size of the random access channel.

35. An electronic device comprising a memory, a processor and a computer program stored on the memory and executable on the processor, wherein the processor implements the method of any one of claims 1-17 when the program is executed by the processor.

36. A computer readable storage medium, characterized in that the computer readable storage medium has stored thereon a computer program which, when executed by a processor, implements the method of any of claims 1-17.