CN113973370A

CN113973370A - Method for sending and receiving random access preamble sequence, terminal and network equipment

Info

Publication number: CN113973370A
Application number: CN202010718801.7A
Authority: CN
Inventors: 郑石磊; 王俊伟; 郑方政
Original assignee: Datang Mobile Communications Equipment Co Ltd
Current assignee: Datang Mobile Communications Equipment Co Ltd
Priority date: 2020-07-23
Filing date: 2020-07-23
Publication date: 2022-01-25
Also published as: WO2022017157A1

Abstract

The invention discloses a method for sending and receiving a random access preamble sequence, a terminal and network equipment. The sending method comprises the following steps: receiving random access configuration information, wherein the time domain symbol number occupied by a lead code sequence format in the random access configuration information is larger than a preset value; determining time-frequency resources for sending random access preamble sequences according to the preamble sequence format; transmitting a random access preamble sequence on the time-frequency resource. The scheme of the invention can reduce the influence on the random access process caused by the fact that the receiving and transmitting beams cannot be completely aligned.

Description

Method for sending and receiving random access preamble sequence, terminal and network equipment

Technical Field

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

Background

In NR (New Radio ), from the perspective of the physical layer, as shown in fig. 1, a 4-step random access procedure includes:

step 1: a terminal (UE) sends a random access Preamble (Preamble) sequence (namely a message 1, Msg1) on a Physical Random Access Channel (PRACH);

step 2: the UE receives a Random Access Response (RAR) message (i.e., message 2, Msg2) on a Physical Downlink Control Channel (PDCCH)/a Physical Downlink Shared Channel (PDSCH);

and step 3: UE sends message 3(Msg3) on PUSCH (physical shared channel) channel;

and 4, step 4: the UE receives a contention resolution message (i.e., message 4, Msg4) on the PDSCH channel.

Before the random access process, the terminal obtains a set of SS/PBCH Block (SSB) indexes, physical layer time frequency resources, a random access preamble sequence format and parameters of a random access preamble sequence set through a system broadcast message, then the UE generates a random access preamble sequence according to the obtained information, and initiates random access on corresponding physical layer random access time frequency resources.

The base station detects the PRACH, and feeds back corresponding Random Access Response (RAR) information on the PDCCH/PDSCH if the base station detects the preamble sequence. After the terminal sends the random access preamble sequence, the terminal detects RAR information fed back on the downlink PDCCH/PDSCH in an RAR time window, and if the corresponding RAR information is detected, the random access preamble sequence sent by the UE is detected by the base station. The RAR information further includes an uplink timing advance adjustment amount of the UE, and the terminal can obtain uplink synchronization according to the adjustment amount, and further can send an uplink resource scheduling request message to perform subsequent data transmission.

The preamble sequence format currently supported by FR2 is shown in table 1 below:

Preamble formats for L_RA∈{139,571,1151}andΔf^RA＝15·2^μkHz whereμ∈{0,1,2,3}.

TABLE 1

The Random access configuration table of FR2 is shown in table 2 below (Random access configurations for FR2 and unpaired spectrum).

Random access configurations for FR2 and unpaired spectrum.

TABLE 2

Obtaining a corresponding preamble format, a radio frame where the PRACH resource is located, a specific subframe number, an initial symbol of the PRACH resource in an RACH slot, the number of time domain PRACH occasions in the RACH slot, the length of a time domain symbol of the PRACH time, and the number of PRACH slots in one time domain granularity according to a PRACH-configuration index configured by a cell; in FR1, PRACH SCS only supports 15KHz or 30KHz, and in a time domain granularity, that is, a subframe, there is only one RACH slot when SCS is 15KHz, and there may be 1 or 2 RACH slots when SCS is 30 KHz. Under FR2, PRACH SCS supports either 60KHz or 120KHz, and in one time domain granularity, i.e. 0.25ms, there is only one RACH slot when SCS is 60KHz, and there may be 1 or 2 RACH slots in one cycle when SCS is 120 KHz; if the number of PRACH slots configured in a period in which two PRACH slots are allowed is 1, the second slot in each period is taken as the PRACH slot, and if the number of PRACH slots configured is 2, both slots in the period are the PRACH slots, as shown in fig. 2.

However, after obtaining the corresponding PRACH resource configuration, whether the configured PRACH opportunity is valid or not needs to be determined based on a specific frame structure, that is, the resource configured in the actual process needs to be chosen or rejected according to the change of the actual frame structure, and the corresponding determination conditions are as follows:

for FDD (Frequency division multiplex) mode, all PRACH opportunities are valid;

for TDD (Time division duplex) mode, if the UE does not receive TDD UL-DL-configuration common, then in the current PRACH slot, if there is no SSB (synchronization signal block) behind the PRACH timer and there is at least an N interval from the last preceding SSB symbol_gapOne symbol, the PRACH occasion is valid, where N_gapThe values may be referenced to a corresponding table in the standard;

for TDD (time division duplex) mode, if the UE receives TDD UL-DL-configuration common, if the PRACH opportunity is on UL (uplink) symbol and there is no SSB following the PRACH opportunity in the current PRACH slot, it is at least N intervals from the last tail symbol of the immediately preceding SSB_gapOne symbol and spaced at least N apart from the last preceding DL (Downlink) symbol_gapOne symbol, the PRACH occasion is valid, where N_gapThe values may be referenced to a corresponding table in the standard.

In the 4-step random access process, the NR protocol focuses on the transmit beam and the receive beam of the base station in the Msg1 and Msg2 processes.

First, the base station informs the terminal of parameters (including RSRP threshold selected by the SSB) determining the association relationship between the SSB and the RO resource subsets, wherein one RO resource subset consists of one or more ROs, through a system broadcast message.

Secondly, the UE carries out downlink SSB detection, judges whether the actual RSRP measurement value of the SSB is larger than the RSRP threshold value obtained from the system broadcast message, and if the actual RSRP measurement value of the SSB is judged to be larger than the RSRP threshold value, the RO resource subset related to the SSB is used as a candidate resource set of the Msg 1.

And the base station transmits the Msg2 on the associated transmission beam according to the RO resource for detecting the lead code and the association relation with the downlink transmission beam.

Wherein, RO refers to a time-frequency resource for transmitting PRACH Msg1 on a specific sending beam according to a configured PRACH preamble sequence format;

due to the increase of carrier frequency, energy attenuation in the signal propagation process is too large, and maintaining the existing preamble sequence format may cause coverage reduction, thereby affecting the operable range and reliability of the initial access process. Furthermore, since the ultra-high frequency band beam is narrower than the original FR1 and FR2, slight changes in the transmission and reception directions of the beam may cause misalignment of the transmission and reception beams, resulting in performance loss.

Disclosure of Invention

The embodiment of the invention provides a method for sending and receiving a random access preamble sequence, a terminal and network equipment. The method has the advantages that the sending energy of the lead code is improved by increasing the number of symbols of the lead code time domain, and the influence on the random access process caused by the fact that the receiving and sending beams cannot be completely aligned is reduced by increasing the process of beam scanning and PRACH sending for the UE.

In order to solve the above technical problem, an embodiment of the present invention provides the following technical solutions:

a method for transmitting a random access preamble sequence, applied to a terminal, the method comprising:

receiving random access configuration information, wherein the time domain symbol number occupied by a lead code sequence format in the random access configuration information is larger than a preset value;

determining time-frequency resources for sending random access preamble sequences according to the preamble sequence format;

transmitting a random access preamble sequence on the time-frequency resource.

Optionally, the random access preamble sequence formats include M formats; the time domain length corresponding to at least one of the M formats is n times of a first preset value, the length of the cyclic prefix CP is n times of a second preset value, and n is a positive integer.

Optionally, the M formats include: a first format, a second format, a third format, a fourth format, a fifth format, a sixth format, a seventh format, an eighth format, and a ninth format;

wherein the first format and the second formatTime domain length N corresponding to the third format respectively_μN times the first value, respectively, and the lengths of the cyclic prefixes CP respectively corresponding to the first value

Are respectively n times of the second value;

time domain length N corresponding to the fourth format, the fifth format, the sixth format and the seventh format respectively_μN times the third value, respectively, corresponding to the length of the cyclic prefix CP

Are respectively (2n + 1). 72 k.2^-μ、 (4n+1)·72κ·2^-μ、(6n+1)·72κ·2^-μ、(12n+1)·72κ·2^-μ；

Wherein, k is T_s/T_c＝64，T_s＝1/(△f_ref·N_f,ref)，T_c＝1/(△f_max·N_f)，Δf_max＝480·10³Hz， N_f＝4096，△f_ref＝15·10³Hz，N_f,ref＝2048；μ∈{2,3,[4]…}；

Eighth Format and ninth Format, corresponding time Domain Length N_μN times the fifth value, respectively, and the lengths of the cyclic prefixes CP respectively corresponding to the fifth value

The sixth value is kept unchanged.

Optionally, in the random access configuration information, 2 is consecutive^μ-3Binding PRACH time slots of physical random access channels into a sub-block, wherein mu is more than or equal to 3; the random access configuration information further comprises at least one of the following parameters:

the number of subblocks bound to the PRACH time slot within the time domain basic granularity;

the number of PRACH occasions in one sub-block;

time domain symbol length of PRACH occasion in one sub-block

Number of symbols occupied by PRACH time domain of each random access channel

Wherein,

the number of PRACH occasions in the time domain in one PRACH time slot is

Optionally, if the number of PRACH occasions in the time domain of one PRACH time slot

If the number of symbols included in the corresponding PRACH time domain is less than 14, the number of the PRACH occasions is 1;

if the number of PRACH occasions in the time domain in one PRACH time slot

Less than 1, and the corresponding PRACH time domain contains more than 14 symbols, the

Meaningless;

if the number of PRACH occasions in the time domain in one PRACH time slot

Greater than 1 and non-integer, the PRACH opportunity number is right

The resulting value is rounded down.

Optionally, if

If the number exceeds 14, the number of PRACH time slots contained in the time domain basic granularity is 2;

if it is not

Less than 14, the value of the number of PRACH slots contained within one time domain basic granularity remains unchanged.

Optionally, the random access preamble sequence format includes M + L formats; the first M formats include: a first format, a second format, a third format, a fourth format, a fifth format, a sixth format, a seventh format, an eighth format, and a ninth format; l is an integer greater than or equal to 1;

wherein, the time domain length N respectively corresponding to the first format, the second format and the third format_μFor the first value, the lengths of the respective corresponding cyclic prefixes CP

Is a second value;

time domain length N corresponding to the fourth format, the fifth format, the sixth format and the seventh format respectively_μFor the third value, the lengths of the cyclic prefixes CP

Is a fourth value;

eighth format and ninth format, respectively corresponding to time domain length N_μAs a fifth value, the lengths of the cyclic prefixes CP

Is the sixth value.

Optionally, the time domain length N corresponding to the M + L1 th format_μ＝n_A·2048κ·2^-μLength of cyclic prefix CP

Wherein n is_AWhen L1 is a positive integer and has different values, n is the same as_ADifferent;

time domain length N corresponding to M + L2 th format_μ＝n_B·2048κ·2^-μLength of cyclic prefix CP

Wherein n is_BWhen L2 is a positive integer and has different values, n is the same_BDifferent;

time domain length N corresponding to M + L3 th format_μ＝n_C·2048κ·2^-μLength of cyclic prefix CP

Wherein n is_CIs a positive integer; when L3 is different, n is corresponding_CIn contrast, L1, L2, and L3 indicate ordinal numbers that increase from the M-th format, and L1+ L2+ L3 is less than or equal to L.

Optionally, determining, according to the preamble sequence format, a time-frequency resource for sending a random access preamble sequence, includes:

determining the effectiveness of a PRACH occasion in a sub-block bound by a plurality of PRACH time slots;

and determining a time-frequency resource RO used for transmitting the random access preamble sequence on a sending beam according to the preamble sequence format based on the effective PRACH opportunity.

Optionally, the sending a random access preamble sequence on the time-frequency resource includes:

after determining the available RO, determining whether to switch beams when the RO is sent according to the configured or pre-configured number of the sending beams;

when the beam switching in the RO is needed, different beams are switched and the random access preamble sequence is sent.

Optionally, the first time interval Gap for beam switching is located at the beginning of each RO.

Optionally, the time domain structure of each RO is the same; or,

adding extra _ CP on the basis of the original CP length of each RO, wherein the length of the extra _ CP is not less than the time of beam switching; or,

adding an extra section of random signal on the basis of the original CP of the RO, wherein the length of a time domain of the random signal is not less than the time of beam switching; or,

the first symbol of each RO is used for beam switching as a whole.

Optionally, the second time interval Gap for beam switching is located on the symbol where beam switching occurs.

Optionally, the second time interval Gap is located at the head of the symbol where the beam switching occurs, and the rest of the symbol is used for transmitting the cyclic prefix CP of the symbol set on the corresponding beam; or,

the second time interval Gap is located at the tail of the symbol where the beam switching occurs, and the next symbol is used for transmitting a cyclic prefix CP of the symbol set on the corresponding beam; or,

the second time interval Gap is located in the middle of the symbol where the beam switching occurs, a portion before the second time interval Gap serves as performance enhancement, and a portion after the second time interval Gap serves as a cyclic prefix CP for transmitting the symbol set on the corresponding beam.

Optionally, the number of times a beam can be switched within one RO does not exceed n.

Optionally, if the random access procedure is triggered by a higher layer, introducing a corresponding parameter in the higher layer for indicating the number of beams used within one RO, the number of beams being log₂n bits to indicate;

if the random access procedure is triggered by PDCCH signaling, a new information field is introduced in PDCCH format 1-0 or the number of beams used within one RO is indicated by reserved bits, which are represented by log₂n bits.

Optionally, the symbol positions used for beam switching in the same RO are equally divided into m in the time domain according to the number m of available beams configured or preconfigured;

if the RO can be equally divided into m parts in the time domain, the first symbols of the remaining m-1 parts except the first part in the m parts of beams are all used for beam switching;

if the RO cannot be equally divided into m parts in the time domain, the number of m 'symbols as the remainder is included in the m-th part, or one more symbol is allocated to each of the m' parts, and the first symbols of the m parts are all used for beam switching.

Optionally, the switching sequence of the transmit beams within the same RO includes:

if each RO configures m beams, where m < ═ n; and using the corresponding receiving beam when the synchronization block is detected as a central transmitting beam, selecting m-1 beams closest to the central beam on two sides of the central beam according to the number m of beams configured or preconfigured by the system to switch the beams, and transmitting the same RO.

Optionally, if the random access process is triggered by a high-level signaling, the terminal performs detection of a downlink synchronization block, determines whether an actual RSRP measurement value of the synchronization block is greater than an RSRP threshold obtained from a system broadcast message, and if so, uses a beam corresponding to the synchronization block as a central beam;

if the random access procedure is triggered by PDCCH signaling, the terminal uses the PDCCH signaling to designate a beam corresponding to the synchronization block as a central beam.

Optionally, after configuring m beams, the method further includes:

and switching according to the sequence from large to small or from small to large of the corresponding synchronous block index of each beam, and transmitting each part of the content of the RO in the beam.

The embodiment of the invention also provides a method for receiving the random access preamble sequence, which is applied to network equipment and comprises the following steps:

sending random access configuration information, wherein the time domain symbol number occupied by a lead code sequence format in the random access configuration information is larger than a preset value;

and receiving the random access preamble sequence transmitted by the terminal on the time-frequency resource for transmitting the random access preamble sequence.

Optionally, the receiving the random access preamble sequence sent by the terminal on the time-frequency resource for sending the random access preamble sequence includes:

if the corresponding receiving beam of the network equipment can cover the transmitting beams of the m terminals and the receiving beams are not switched, the network equipment combines all the lead codes for detection after receiving the lead codes from a plurality of different beams; or

If the corresponding receiving beam of the network equipment can not cover the transmitting beams of the m terminals and the receiving beams are not switched, the network equipment only receives the lead codes on part of the beams; or

If the corresponding receiving beam of the network equipment can not cover the transmitting beams of the m terminals, but the network equipment switches the receiving beams, the network equipment firstly determines a central receiving beam according to the association relation between the RO resource for detecting the lead code and the downlink transmitting beam, selects m-1 beams closest to the central beam to switch the beams and receives the same RO; and on the rest m-1 beams, switching the beams according to the synchronous block index corresponding to each beam from large to small or from small to large to receive the rest part of the content of the RO.

An embodiment of the present invention further provides a terminal, including: the transceiver, the processor, the memorizer, store the procedure that the said processor can carry out on the said memorizer; the processor implements, when executing the program: receiving random access configuration information, wherein the time domain symbol number occupied by a lead code sequence format in the random access configuration information is larger than a preset value; determining time-frequency resources for sending random access preamble sequences according to the preamble sequence format; transmitting a random access preamble sequence on the time-frequency resource.

wherein, the time domain length N respectively corresponding to the first format, the second format and the third format_μRespectively of a first valuen times, length of the corresponding cyclic prefix CP

Are respectively n times of the second value;

The sixth value is kept unchanged.

Optionally, the processor is further configured to: in the random access configuration information, 2 is continuous^μ-3Binding a PRACH time slot of each physical random access channel into a subblock, wherein mu is more than or equal to 3; the random access configuration information further comprises at least one of the following parameters:

the number of PRACH occasions in one sub-block;

time domain symbol length of PRACH occasion in one sub-block

Number of symbols occupied by PRACH time domain of each random access channel

Wherein,

the number of PRACH occasions in the time domain in one PRACH time slot is

if the number of PRACH occasions in the time domain in one PRACH time slot

Meaningless;

if the number of PRACH occasions in the time domain in one PRACH time slot

Greater than 1 and non-integer, the PRACH opportunity number is right

The resulting value is rounded down.

Optionally, if

if it is not

Is a second value;

Is a fourth value;

Is the sixth value.

Optionally, the time domain structure of each RO is the same; or,

the first symbol of each RO is used for beam switching as a whole.

Optionally, the symbol positions used for beam switching in the same RO are equally divided into m parts in the time domain according to the number m of available beams configured or preconfigured, and the remaining m-1 parts of first symbols except the first part in the m parts of beams are all used for beam switching;

if the RO cannot be equally divided into m parts in the time domain, the number of m 'symbols as the remainder is included in the m-th part, or one more symbol is assigned to each of the m' first parts.

Optionally, the switching sequence of the transmit beams within the same RO is as follows:

Optionally, after m beams are configured, the processor is further configured to switch between the two beams according to the sequence of the synchronization block index corresponding to each beam from large to small or from small to large, and send each part of the content of the RO in the beam.

An embodiment of the present invention further provides a device for transmitting a random access preamble sequence, which is applied to a terminal, and the device includes:

the receiving and sending module is used for receiving random access configuration information, and the number of time domain symbols occupied by a preamble sequence format in the random access configuration information is larger than a preset value;

the processing module is used for determining time-frequency resources for sending the random access lead code sequence according to the lead code sequence format;

the transceiver module is further configured to transmit a random access preamble sequence on the time-frequency resource.

An embodiment of the present invention further provides a network device, including: the transceiver, the processor, the memorizer, store the procedure that the said processor can carry out on the said memorizer; the processor implements, when executing the program: sending random access configuration information, wherein the time domain symbol number occupied by a lead code sequence format in the random access configuration information is larger than a preset value; and receiving the random access preamble sequence transmitted by the terminal on the time-frequency resource for transmitting the random access preamble sequence.

The embodiment of the present invention further provides a receiving apparatus for a random access preamble sequence, which is applied to a network device, and includes:

the receiving and sending module is used for sending random access configuration information, and the number of time domain symbols occupied by a preamble sequence format in the random access configuration information is larger than a preset value; and receiving the random access preamble sequence transmitted by the terminal on the time-frequency resource for transmitting the random access preamble sequence.

Embodiments of the present invention also provide a processor-readable storage medium having stored thereon processor-executable instructions for causing the processor to perform the method as described above.

The embodiment of the invention has the beneficial effects that:

in the above embodiment of the present invention, by receiving the random access configuration information, the number of time domain symbols occupied by the preamble sequence format in the random access configuration information is greater than a preset value; determining time-frequency resources for sending random access preamble sequences according to the preamble sequence format; transmitting a random access preamble sequence on the time-frequency resource. The transmission energy of the lead code is improved by increasing the symbol number of the lead code time domain, and besides, the influence on the random access process caused by the fact that the receiving and transmitting beams cannot be completely aligned is reduced by increasing the process of beam scanning and PRACH transmission for the terminal.

Drawings

Fig. 1 is a schematic flow chart of a 4-step random access process method;

FIG. 2 is a schematic diagram of a RO (RACH interference) configuration;

fig. 3 is a diagram illustrating a transmission method of a random access preamble sequence according to the present invention;

fig. 4 is a schematic diagram of a PRACH configuration mapping rule of 240KHz in an embodiment of the present invention;

FIG. 5 is a schematic diagram of an RO head structure according to an embodiment of the present invention;

FIG. 6 is a schematic diagram illustrating beam switching at an RO initial position according to an embodiment of the present invention;

fig. 7 is a diagram illustrating a beam switch performed within one RO according to an embodiment of the present invention;

fig. 8 is a diagram illustrating a beam switch performed within one RO according to an embodiment of the present invention;

fig. 9 is a diagram illustrating a beam switch performed within one RO according to an embodiment of the present invention;

fig. 10 is a diagram illustrating a format for beam switching in a RO in comparison with a conventional RO format according to an embodiment of the present invention;

FIG. 11 is a block diagram of a terminal according to an embodiment of the present invention;

fig. 12 is a block diagram of a transmitting apparatus for random access preamble sequences according to an embodiment of the present invention.

Detailed Description

Exemplary embodiments of the present invention will be described in more detail below with reference to the accompanying drawings. While exemplary embodiments of the invention are shown in the drawings, it should be understood that the invention can be embodied in various forms and should not be limited to the embodiments set forth herein. Rather, these embodiments are provided so that this disclosure will be thorough and complete, and will fully convey the scope of the invention to those skilled in the art.

As shown in fig. 3, an embodiment of the present invention provides a method for transmitting a random access preamble sequence, which is applied to a terminal, and the method includes:

step 31, receiving random access configuration information, wherein the number of time domain symbols occupied by a preamble sequence format in the random access configuration information is greater than a preset value;

step 32, determining time-frequency resources for sending random access preamble sequences according to the preamble sequence format;

step 33, sending a random access preamble sequence on the time frequency resource.

In this embodiment, the preset value may be the number of time domain symbols corresponding to each preamble sequence format in table 1, and the transmission energy increase coverage is improved by increasing the number of time domain occupied symbols of different preamble sequence formats; for the influence caused by the increase of the number of the time domain symbols in the preamble sequence format, the existing PRACH configuration table also needs to be redesigned to adapt to a new structure; due to the increase of the number of preamble time domain symbols, conditions are created for performing multiple beam switching within one RO, so that the same RO can be transmitted on different beams, and a corresponding scheme design is required for beam switching.

In the random access process of the terminal, the Msg1 may specifically include:

after receiving the Configuration information PRACH-Configuration Index of the cell, the UE checks the PRACH Configuration table and determines the specific PRACH Configuration, including the information of the specifically used preamble sequence format, the number of ROs, the number of symbols occupied by each RO, the time domain position and the like;

the first scheme is as follows: in an optional embodiment of the present invention, the random access preamble sequence formats include M formats; the time domain length corresponding to at least one of the M formats is n times of a first preset value, the length of the cyclic prefix CP is n times of a second preset value, and n is a positive integer. The first predetermined value here generally refers to the time domain length in a certain format, such as N corresponding to format A1_μThe value of (b) may be specifically 2 · 2048 κ · 2^-μSimilarly, N may be associated with any one of the formats in Table 1_μA value; the second predetermined value here generally refers to the length of the CP in a certain format, such as format A1

The value of (b) may be 288 k 2^-μSimilarly, the format may be one corresponding to any one of the formats in table 1

The value of (c).

wherein, the time domain length N respectively corresponding to the first format, the second format and the third format_μN times the first value, respectively, and the lengths of the cyclic prefixes CP respectively corresponding to the first value

Is n times the second value; when the first format is the above-mentioned format a1, the first value is a latticeN corresponding to formula A1_μA value of (d); when the second format is the format A2, the first value is N corresponding to the format A2_μA value of (d); when the third format is the format A3, the first value is N corresponding to the format A3_μA value of (d); similarly, the second values may be corresponding to the formats A1, A2, and A3, respectively

Are respectively (2n + 1). 72 k.2^-μ、 (4n+1)·72κ·2^-μ、(6n+1)·72κ·2^-μ、(12n+1)·72κ·2^-μ(ii) a Wherein, k is T_s/T_c＝64， T_s＝1/(△f_ref·N_f,ref)，T_c＝1/(△f_max·N_f)，Δf_max＝480·10³Hz，N_f＝4096，△f_ref＝15·10³Hz， N_f,ref＝2048；μ∈{2,3,[4]… }; when the fourth format is the format B1, the third value is N corresponding to the format B1_μA value of (d); when the fifth format is the format B2, the third value is N corresponding to the format B2_μA value of (d); when the sixth format is the format B3, the third value is N corresponding to the format B3_μA value of (d); when the seventh format is the format B4, the third value is N corresponding to the format B4_μA value of (d); similarly, the fifth values of B1, B2, B3 and B4 may be (2n +1) · 72 κ · 2, respectively^-μ、(4n+1)·72κ·2^-μ、 (6n+1)·72κ·2^-μ、(12n+1)·72κ·2^-μ；

Keeping the sixth value unchanged; when the eighth format is the format C0, the fifth value is N corresponding to the format C0_μA value of (d); when the ninth format is the format C2, the fifth value is N corresponding to the format C2_μThe value of (c).

Specifically, the number of preamble time domain symbols is increased, and the GT corresponding to each format is ensured as much as possible: guard Time (Guard interval) does not change, and the requirement on transmission distance in the current standard is not changed;

increasing energy and thus increasing PRACH coverage by multiplying the number of time domain symbols occupied by each preamble sequence format (based on a preamble sequence format table with SCS 15,30,60,120 KHz), where N is_μIndicating the time domain length (mu associated with SCS) of each preamble sequence format,

a CP (cyclic prefix) length representing a current preamble sequence format;

in conjunction with Table 1 above, for preamble sequence format A1/A2/A3 enhancement, if N_μEnlarging to n times of original size is corresponding

The size is enlarged to n times of the original size; here, the first format may be here a1 enhanced preamble sequence format a1 ', the second format may be here a2 enhanced preamble sequence format a2 ', and the third format may be here A3 enhanced preamble sequence format A3 '; the first value may be N corresponding to a1, a2, and A3 in the protocol of table 1_μA value; the second value may be a value corresponding to a1, a2, and A3 in the protocol, respectively, in table 1 above

For preamble sequence format B1/B2/B3/B4 enhancement, if N_μEnlarging by n times of original size

The expansion is performed according to the following table:

the fourth format, the fifth format, the sixth format, and the seventh format correspond to B1 ', B2', B3 ', and B4', respectively; the third value may be N corresponding to B1, B2, B3 and B4 in the table respectively_μA value;

the values of (a) are as in the extended table;

for preamble sequence format C0/C2 enhancements, if N_μEnlarging by n times of original size, corresponding

The original length is kept without changing; wherein n is a positive integer. The eighth format and the ninth format correspond to C0 and C2 enhanced C0 'and C2', respectively; the fifth value may be N corresponding to B1, B2, B3 and B4 in the protocol of Table 1 above respectively_μA value; the sixth value may be

The values of (b) may be the values in table 1 above.

Based on the first scheme, a new SCS (e.g. 240KHz, 480KHz, etc.) is introduced for PRACH: in an optional embodiment of the present invention, the method for sending a random access preamble sequence further includes:

in the random access configuration information, 2 is to be continued^μ-3The PRACH time slot of each physical random access channel is bound into a subblock, and mu is more than or equal to 3;

the random access configuration information further comprises at least one of the following parameters:

the number of sub-blocks bound to a PRACH time slot within a time domain basic granularity (60KHZ time slot);

the number of PRACH occasions in one sub-block;

time domain symbol length of PRACH occasion in one sub-block

Number of symbols occupied by PRACH time domain of each random access channel

Wherein,

the number of PRACH occasions in the time domain in one PRACH time slot is

Here, specifically, based on the first scheme, the PRACH configuration source of FR2 in the protocol

The table is as follows:

assume that the number of preamble time domain symbols increased in the first step is n times of the original number. By modifying the parameter definition in the existing table, taking 240KHz as an example, as shown in fig. 4:

binding, dividing 0.25ms into two parts, 2 in succession^μ-3(μ>3) The PRACH slots are respectively bound into a sub-block, and the sub-block is a bound PRACH slot;

number of PRACH slots with a 60kHz slot (Number of PRACH slots within 60 kHz) is changed to Number of Bundling PRACH slots with a 60kHz slot (Number of sub-blocks bundled by PRACH slots within 60 kHz): assuming that the configuration is N, selecting N Bundling PRACH slots from back to front in the corresponding time domain length of 60kHz slots according to a selection rule;

number of time-domain PRACH instances with a PRACH slot (Number of time domain PRACH opportunities in one PRACH slot): changing to number of time-domain PRACH instances with a Bundling PRACH slot (the number of PRACH occasions in one sub-block);

PRACH duration (number of symbols occupied by PRACH time domain): all elements are enlarged by n times

Need to ensure

The remaining configuration parameters are unchanged.

Based on the first solution, if no new SCS is introduced for the PRACH for the 52.6GHz, in an optional embodiment of the present invention, the sending method of the random access preamble sequence may further include:

in the random access configuration information, the number of symbols occupied by each random access channel PRACH time domain is

The number of symbols occupied by each PRACH time domain is determined;

the number of PRACH occasions in the time domain in one PRACH time slot is

Optionally, the number of PRACH occasions in a time domain in one PRACH time slot

If the number of symbols contained in the corresponding PRACH time domain is less than 14, the number of the PRACH occasions is 1;

if the number of PRACH occasions in the time domain in one PRACH time slot

Less than 1, and the number of symbols included in the corresponding PRACH time domain is greater than 14, the value of the parameter is meaningless and marked as "-";

if the number of PRACH occasions in the time domain in one PRACH time slot

Greater than 1 and non-integer, the PRACH opportunity number is right

The resulting value is rounded down.

Optionally, for the number of PRACH slots included in the time domain basic granularity (60KHz slot), if the corresponding PRACH time domain includes a symbol number

If the number of the PRACH time slots exceeds 14, only the configuration of the PRACH time slots contained in the 60KHz time slots with the number of 2 is reserved, and the configuration with the value of 1 is removed; if the corresponding PRACH time domain contains a symbol number

Still less than 14, the value of the number of PRACH slots contained within one 60KHz slot remains unchanged.

Here, specifically, it is assumed that the number of preamble time domain symbols is increased by n times as much as the original number in the first step.

PRACH duration: all elements are enlarged by n times

Number of time-domain PRACH instances with a PRACH slot: all elements are reduced by a factor of n

If the result after the reduction is less than 1 and the corresponding PRACH duration is less than 14, then the result is 1

If the result after the reduction is less than 1 and the corresponding PRACH duration is greater than 14, this means that the number of symbols occupied by the preamble is already greater than 14 symbols of slot, so the value of the parameter is meaningless at this time and is marked as "-".

If the reduced result is more than 1 and is not an integer, rounding down;

Number of PRACH slots within a 60kHz slot：

if the result after the corresponding PRACH duration expansion exceeds 14, only the configuration with the Number of PRACH slots with the 60kHz slot value of 2 is reserved, and the corresponding configuration with the value of 1 is removed;

if the result after the expansion of the corresponding PRACH duration is still less than 14, the value of Number of PRACH slots with a 60kHz slot does not need to be modified;

the remaining configuration parameters are unchanged.

In a second aspect, in an optional embodiment of the present invention, the random access preamble sequence format includes M + L formats; the first M formats include: a first format, a second format, a third format, a fourth format, a fifth format, a sixth format, a seventh format, an eighth format, and a ninth format; l is an integer greater than or equal to 1;

Is a second value;

Is a fourth value;

Is the sixth value.

Here, specifically, new Preamble lengths are introduced for A, B, C three formats (based on the Preamble formats table with SCS 15,30,60,120 KHz):

adding one or more preamble formats A, N_μ＝n_A·2048κ·2^-μ，

Wherein n is_AIs a positive integer;

adding one or more preamble formats B, N_μ＝n_B·2048κ·2^-μ，

Wherein n is_BIs a positive integer;

adding one or more preamble formats C, N_μ＝n_C·2048κ·2^-μ，

Wherein n is_CIs a positive integer;

wherein n is_A、n_B、n_CAre all positive integers.

A specific implementation example:

example 1: increasing the number of time-domain symbols for the first point (above 52.6GHz possibly introduces a new SCS)

The first scheme is as follows: for example, adding A4, namely expanding A2 by two times as a whole; newly adding B5: b2 was enlarged two times as a whole; newly adding C3: expand C0 by a factor of two;

scheme II: for example, adding A4, adding format of 7 symbols; newly adding B5: adding a format of 7 symbols; newly adding C3: adding a format of 3 symbols;

another specific implementation example:

example 2: redesigning a table of PRACH configuration for increasing the number of symbols occupied by a preamble time domain

The first scheme is as follows: new SCS is introduced for PRACH, for example, 240KHz

Bundling, dividing 0.25ms into two parts, 2 consecutive^4-3Binding each PRACH slot into a sub-block, wherein the sub-block is a Bundling PRACH slot;

the Number of PRACH slots with a 60kHz slot is changed into the Number of Bundling PRACH slots with a 60kHz slot;

number of time-domain PRACH instances with a PRACH slot: changing to number of time-domain PRACH instances with a Bundling PRACH slot;

PRACH duration: all elements are enlarged by n times

Need to ensure

The remaining configuration parameters are unchanged.

Scheme II: if no new SCS is introduced for PRACH for 52.6GHz above

Assume that the number of preamble time domain symbols increased in the first step is 2 times of the original number.

PRACH duration: all elements are enlarged by 2 times

Number of time-domain PRACH instances with a PRACH slot: all elements are reduced by a factor of 2

If the result after the reduction is less than 1 and the corresponding PRACH duration is less than 14, then the result is 1;

if the result after reduction is less than 1 and the corresponding PRACH duration is greater than 14, this means that the number of symbols occupied by the preamble is already greater than 14 symbols of slot, so the value of this parameter is meaningless at this time and is marked as "-";

if the reduced result is more than 1 and is not an integer, rounding down;

Number of PRACH slots within a 60kHz slot：

the remaining configuration parameters are unchanged.

For example, the following table:

in an alternative embodiment of the present invention, step 32 may include:

step 321, determining the validity of PRACH opportunities in a sub-block bound together by a plurality of PRACH time slots;

step 322, determining a time-frequency resource RO for transmitting a random access preamble sequence on a transmit beam according to the preamble sequence format based on the valid PRACH occasion.

Here, the validity of PRACH occasion is judged in a corresponding PRACH slot (Bundling PRACH slot).

In an alternative embodiment of the present invention, step 33 may comprise:

step 331, after determining the usable ROs, determining whether to perform beam switching when transmitting the ROs according to the number of configured or preconfigured transmission beams, and if the number of configured beams in one RO is greater than 1, performing beam switching in the RO;

step 332, when the beam switching in the RO is needed, different beams are switched, and the random access preamble sequence is sent.

After determining the usable RO, the terminal determines whether to switch beams when transmitting the RO according to the configured or preconfigured number m of the transmission beams, and if m >1, the beam switching is required; a specific RO structure; in particular where beam switching occurs within the RO; the specific switching order of the beams within the RO is as follows. The UE switches different beams to transmit msg 1.

In the embodiment of the present invention, the configuration of the random access preamble sequence format may be implemented independently, that is, the scheme of only increasing the time domain length of the PRACH may be implemented independently;

in the embodiment of the present invention, only the beam switching in the RO may be performed, that is, the scheme of the beam switching in the RO may also be implemented independently;

in the embodiment of the invention, the scheme of increasing the time domain length of the PRACH and switching the beams in the RO is combined together, and the method can also be realized.

In an alternative embodiment of the present invention, the structure of the RO is as follows:

a first time interval Gap for beam switching is located at the beginning of each RO, and the first time interval Gap is used to satisfy a time duration required for beam switching.

Optionally, the time domain structure of each RO is the same; or, adding an extra _ CP on the basis of the original CP length of each RO, wherein the length of the extra _ CP is not less than the beam switching time; or, adding an extra section of random signal on the basis of the original CP of the RO, wherein the length of the time domain of the random signal is not less than the time of beam switching; alternatively, the first symbol of each RO is used for beam switching as a whole.

In an alternative embodiment of the present invention, the beam switching occurs at the following locations within the RO:

equally dividing RO into m parts in time domain according to the configured or pre-configured number m of available beams at the symbol position for beam switching in the same RO;

the second time interval Gap for beam switching is located on the symbol where beam switching occurs:

the second time interval Gap is located at the head of the symbol where the beam switching occurs, and the rest of the symbol is used for transmitting the cyclic prefix CP of the symbol set on the corresponding beam; or,

if the random access procedure is triggered by PDCCH orger, a new information field is introduced in PDCCH format 1-0 or the number of beams used within one RO is indicated by reserved bits, which may be log₂n bits.

In an alternative embodiment of the present invention, the switching sequence of the transmit beams within the same RO is as follows:

assume that each RO configures m beams, where m < ═ n; and using the corresponding receiving beam when the synchronization block is detected as a central transmitting beam, selecting m-1 beams closest to the central beam on two sides of the central beam according to the number m of beams configured or preconfigured by the system to switch the beams, and transmitting the same RO.

Optionally, if the random access process is triggered by a high-level signaling, the terminal performs detection of a downlink synchronization block, determines whether an actual RSRP measurement value of the synchronization block is greater than an RSRP threshold obtained from a system broadcast message, and if yes, uses a beam corresponding to the synchronization block as a central beam;

Optionally, after m wave beams are determined, the method may further include:

and switching the beams according to the sequence from large to small or from small to large of the corresponding synchronous block index of each beam to transmit each part of the content of the RO.

In this embodiment, the specific scheme for whether to perform beam switching when transmitting an RO is designed as follows:

the UE performs beam scanning in one RO:

since the number of symbols occupied by the preamble time domain is increased in order to enhance the coverage of PRACH, and a larger SCS may be introduced for PRACH, meaning that there may be more symbols available for PRACH transmission within the same time granularity. Therefore, powerful conditions are provided for the UE to perform beam switching in one RO, so that excessive enhancement of the UE is not required for beam scanning in one RO;

the RO in the scheme refers to a time-frequency resource for transmitting the PRACH Msg1 on one or more specific sending beams according to the configured PRACH preamble sequence format;

(1) reserving a section of Gap at the beginning of each RO additionally for beam switching time (at the base station side), wherein the length of the Gap at least can meet the time length required by the beam switching; it should be ensured that the length of the PRACH time domain does not change after the header GAP is added, as shown in fig. 5, the GT time is correspondingly reduced:

in addition, the Gap may also be used for LBT Gap of the unlicensed band (including LBT duration + UL/DL handover duration), if the length used for the unlicensed band Gap should also satisfy the sum of the LBT duration plus the time required for UL/DL handover, as specifically shown in fig. 6;

1): the Fixed _ Gap with the unified standard can meet the maximum time required by beam switching, and the RO time domain structure with the mode is unified, regular and simple to process; or,

2): adding extra _ CP on the basis of the original CP length of the RO, wherein the length of the extra _ CP is not less than the time of beam switching because the initial stage of the RO time domain can be used for beam switching; or,

3): an extra section of random signal is added on the basis of the original CP of the RO, and the length of the time domain of the random signal is not less than the time of beam switching as the RO time domain initial stage can be used for beam switching; or,

4): the first symbol as a whole is used for beam switching; or,

5): without additional reserved Gap, the reserved Gap between ROs in the current standard can already meet the beam switching requirements of different ROs.

(2) Symbol structure when beam switching occurs within RO: for beam switching in the middle of RO, a preamble symbol is sacrificed to switch beams, wherein a former part of the symbol is used for beam switching, and a remaining part is used as a CP of a following preamble symbol, as shown in fig. 7, which is a more general practice;

alternatively, the last part of the symbol is used for beam switching and the immediately following symbol is used for CP of the following beam, as shown in fig. 8, for which the remaining resources can be used for other enhancements depending on the UE implementation;

or, flowing out the GAP at the middle position of the symbol to be used for switching the beam, using the remaining first half symbol part for performance enhancement or other processing, and leaving the UE to implement, using the remaining second half symbol part as the CP for transmitting the preamble on the corresponding beam, as shown in fig. 9, which has a high requirement on the capability of the UE;

it is also necessary to ensure that the time domain length of the PRACH within the RO can be kept the same as that of the existing format, as shown in fig. 10:

(3) number of beams within the same RO: the number of times that the UE can switch beams within one RO should specifically depend on the number of preamble symbols expanded by the first step; in order to not increase too much burden on the UE, the number of beams that the UE can switch to use within the same RO is limited to not exceed n (if the UE has stronger capability, n may exceed n), where n is a multiple of the expansion in the first step; specifically, within the same RO, the number of transmission beams that the UE can employ can be obtained by higher layer/PDCCH order configuration or pre-configuration.

Introducing corresponding parameters in the higher layer for indicating the number of beams used within one RO, wherein the specific corresponding parameters can be represented by: log (log)₂n bits;

introducing a new information field in PDCCH format 1-0 or indicating the number of beams used within one RO using reserved bits, which may be represented by log₂n bits;

(4) switching sequence of UE transmission beams within the same RO: assume that each RO configures m beams where m < ═ n;

the UE uses the corresponding receiving beam when the synchronization Block (SS/PBCH Block, SSB) is detected as the central transmitting beam of the UE, and then selects m-1 beams closest to the central beam on both sides of the central beam according to the number m of beams configured or preconfigured by the system to switch the beams, and transmits the same RO.

If the random access process is triggered by high-level signaling, the UE carries out downlink SSB detection, judges whether the actual RSRP measurement value of the SSB is greater than the RSRP threshold value obtained from the system broadcast message, and if the actual RSRP measurement value of the SSB is greater than the RSRP threshold value, uses the wave beam corresponding to the SSB as a central wave beam;

if the random access process is triggered by PDCCH signaling, the UE uses the PDCCH signaling to designate a beam corresponding to the SSB as a central beam;

after m beams are determined:

1): switching the beam according to the sequence from big to small or from small to big of the SSB index corresponding to each beam to transmit each part of the content of the RO;

2): firstly, transmitting on a central beam, and then switching beams to transmit each part of content of the RO on the rest m-1 beams in the order from large to small or from small to large according to the SSB identification index corresponding to each beam (the scheme is mainly used for the base station to determine the first received beam, and is mainly used for the scene that the base station also switches beams when receiving the Msg1 because the Msg1 transmitted on the central beam by the UE is the same as the content of the existing R16 protocol);

(5) determination of preamble symbol positions for beam switching within the same RO: and equally dividing the RO into m parts in a time domain according to the configured or pre-configured number m of the available beams, wherein all the rest m-1 parts of first preamble symbols are used for beam switching except that the first preamble symbol of the first part does not need special processing.

If RO can not be equally divided into m parts in time domain, the rest m 'symbols are contained in the m-th part, or the first m' parts are all allocated with one more symbol;

in one particular example of an implementation of the invention,

example 3: random access process flow of integral UE (the value of the embodiment only relates to msg1 transceiving)

Step 1: after receiving the configuration information PRACH-configuration index of the cell, the UE checks the PRACH configuration table to determine the specific PRACH configuration, including the information of the specifically used preamble sequence format, the number of ROs, the number of included symbols, the time domain position, and the like; this process needs to be performed in conjunction with the preamble sequence format and the PRACH configuration table in the present invention;

determining the specific position of the PRACH slot according to the specific PRACH configuration parameters, wherein the determination rule is as follows:

in each configured time domain granularity (slot number), continuously selecting N slots from back to front on a time sequence as the PRACH slot or N Bundling slots as the Bundling PRACH slot. (scheme one and scheme two corresponding to PRACH configuration table design respectively)

Step 2: the existing Rel-16 mechanism is continued, and the validity of the PRACH occast is judged in the corresponding PRACH slots (Bundling PRACH slots)

And step 3: after determining the usable RO, the UE determines whether to switch the beam when transmitting the RO according to the configured or preconfigured number of the transmission beams (three (3)), and if m >1 indicates that the beam switching is required;

the specific RO structure may be any combination of the above modes;

in particular where beam switching occurs within the RO, as described above;

the specific switching sequence of the beams in the RO can be selected according to the processing mode of receiving msg1 by the base station (Type-1/2/3) as described above,

the UE switches different beams to transmit msg 1.

According to the embodiment of the invention, the time domain symbol number of the lead code is increased, the sending energy is increased, and the coverage can be improved;

the embodiment of the invention provides an improved scheme of a corresponding PRACH configuration table, which is suitable for the situation that the number of new PRACH SCS and lead code symbols which may appear at 52.6GHz is increased;

the above embodiments of the present invention propose that by sending the same RO on multiple beams, the influence caused by the misalignment of the beams is reduced, and the coverage of PRACH can be improved;

in the above embodiment of the present invention, due to the increase of the number of the preamble time domain symbols, the terminal does not need to have a strong capability to perform the switching in the same RO, or the beam switching can be transmitted in the RO without requiring the capability standard of the current terminal to be improved.

step 101, sending random access configuration information, wherein the number of time domain symbols occupied by a preamble sequence format in the random access configuration information is greater than a preset value;

step 102, receiving the random access preamble sequence sent by the terminal on the time frequency resource sending the random access preamble sequence.

Optionally, step 102 may include:

The specific implementation process is as follows: the base station receives the Msg1 (Type-1/2/3) according to a specific processing mode, and the base station receives the Msg1 and then carries out three processing modes (the three processing modes are configured according to specific scenes and actual situations):

type-1: if the corresponding receiving beam of the base station is wider and can cover the transmitting beams of m UEs without switching the receiving beams, the base station combines all the lead codes for detection after receiving the lead codes from a plurality of different beams, thereby bringing performance gain

Type-2: if the corresponding receiving beam of the base station is narrower and cannot cover the transmitting beams of the m UEs, and the receiving beam is not switched, the base station may only receive msg1 on the partial beam, so that the processing method can reduce the possibility of the beams between the UE and the base station being not aligned; compared with the original method that the UE only adopts one beam to send the same RO, if the sending beam deviates from the receiving beam of the base station, the whole RO can not be received by the base station; but the possible performance of the situation is reduced by using a plurality of beams to transmit the same RO, the robustness of the PRACH is increased, and the method can be more suitable for the scene of narrowing the beams in a high frequency band;

type-3: if the corresponding receiving beam of the base station is narrower and cannot cover the transmitting beams of m UEs, but the base station switches the receiving beams, the base station firstly determines the central receiving beam according to the detected association relation between the RO resource of Preamble and the downlink transmitting beam (but on the premise of ensuring that the switching sequence of the UE transmitting beam is the second condition, selects m-1 beams closest to the central beam to switch the transmitting beams and receive the same RO, and switches the beams on the rest m-1 beams according to the SSB index corresponding to each beam and the sequence from big to small or from big to receive the rest content of the RO, wherein the switching sequence is kept the same as that of the UE.

It should be noted that this embodiment is a network-side method corresponding to the terminal-side method described above, and all implementation procedures in the above-described embodiment are applied to this network-side method, and the same technical effects can be achieved.

As shown in fig. 11, an embodiment of the present invention further provides a terminal 110, which may include: a transceiver 111, a processor 112, and a memory 113, wherein the memory 113 stores a program executable by the processor 112; the processor 112, when executing the program, implements: receiving random access configuration information, wherein the time domain symbol number occupied by a lead code sequence format in the random access configuration information is larger than a preset value; determining time-frequency resources for sending random access preamble sequences according to the preamble sequence format; transmitting a random access preamble sequence on the time frequency resources.

wherein, the first format, the second format and the third formatTime domain length N corresponding to formats respectively_μN times the first value, respectively, and the lengths of the cyclic prefixes CP respectively corresponding to the first value

Are respectively n times of the second value;

The sixth value is kept unchanged.

Optionally, the sending method of the random access preamble sequence further includes:

in the random access configuration information, 2 is continuous^μ-3The PRACH time slot of each physical random access channel is bound to be a subblock, and mu is more than or equal to 3; the random access configuration information further comprises at least one of the following parameters:

the number of PRACH occasions in one sub-block;

time domain symbol length of PRACH occasion in one sub-block

Number of symbols occupied by PRACH time domain of each random access channel

Wherein,

the number of PRACH occasions in the time domain in one PRACH time slot is

Alternatively to this, the first and second parts may,

if the number of PRACH occasions in the time domain in one PRACH time slot

if the number of PRACH occasions in the time domain in one PRACH time slot

Meaningless;

if the number of PRACH occasions in the time domain in one PRACH time slot

Greater than 1 and non-integer, the PRACH opportunity number is right

The resulting value is rounded down.

Optionally, if

if it is not

Is a second value;

Is a fourth value;

Is the sixth value.

Optionally, the time domain structure of each RO is the same; or,

the first symbol of each RO is used for beam switching as a whole.

Optionally, after m wave beams are determined, the method further includes:

It should be noted that the communication device in this embodiment is a terminal corresponding to the method shown in fig. 3, and the implementation manners in the above embodiments are all applicable to this embodiment, and the same technical effect can be achieved. In the terminal, the transceiver 111 and the memory 113, and the transceiver 111 and the processor 112 may be communicatively connected through a bus interface, the function of the processor 112 may also be implemented by the transceiver 111, and the function of the transceiver 111 may also be implemented by the processor 112. It should be noted that, the terminal provided in the embodiment of the present invention can implement all the method steps implemented by the method embodiment and achieve the same technical effect, and detailed descriptions of the same parts and beneficial effects as the method embodiment in this embodiment are omitted here.

As shown in fig. 12, an embodiment of the present invention further provides an apparatus 120 for transmitting a random access preamble sequence, which is applied to a terminal, and the apparatus includes:

a transceiver module 121, configured to receive random access configuration information, where a time domain symbol number occupied by a preamble sequence format in the random access configuration information is greater than a preset value;

a processing module 122, configured to determine, according to the preamble sequence format, a time-frequency resource for sending a random access preamble sequence;

the transceiver module 121 is further configured to transmit a random access preamble sequence on the time-frequency resource.

Are respectively n times of the second value;

The sixth value is kept unchanged.

the number of PRACH occasions in one sub-block;

time domain symbol length of PRACH occasion in one sub-block

Number of symbols occupied by PRACH time domain of each random access channel

Wherein,

the number of PRACH occasions in the time domain in one PRACH time slot is

OptionallyIf the number of PRACH occasions in the time domain in one PRACH slot is smaller than the number of PRACH occasions in the time domain

if the number of PRACH occasions in the time domain in one PRACH time slot

Meaningless;

if the number of PRACH occasions in the time domain in one PRACH time slot

Greater than 1 and non-integer, the PRACH opportunity number is right

The resulting value is rounded down.

Optionally, if

if it is not

wherein, the first format, the second format and the second formatTime domain length N corresponding to three formats respectively_μFor the first value, the lengths of the respective corresponding cyclic prefixes CP

Is a second value;

Is a fourth value;

Is the sixth value.

Wherein n is_CIs a positive integer; when L3 is different, n is corresponding_CDifferent from L1 and L2L3 denotes the ordinal value starting to increase in the mth format, L1+ L2+ L3 being less than or equal to L.

Optionally, the time domain structure of each RO is the same; or,

the first symbol of each RO is used for beam switching as a whole.

Optionally, after m wave beams are determined, the method further includes:

It should be noted that the apparatus in this embodiment is an apparatus corresponding to the method shown in fig. 3, and the implementation manners in the above embodiments are all applicable to the embodiment of the apparatus, and the same technical effects can be achieved. It should be noted that, the apparatus provided in the embodiment of the present invention can implement all the method steps implemented by the method embodiment and achieve the same technical effect, and details of the same parts and beneficial effects as the method embodiment in the embodiment are not described herein again.

Optionally, the receiving the random access preamble sequence sent by the terminal on the time-frequency resource for sending the random access preamble sequence may include:

Embodiments of the present invention further provide a processor-readable storage medium, where processor-executable instructions are stored, and the processor-executable instructions are configured to enable the processor to execute the method described above, where all implementation manners in the above method embodiments are applicable to this embodiment, and the same technical effect can be achieved.

Those of ordinary skill in the art would appreciate that the elements and algorithm steps of the various embodiments described in connection with the embodiments disclosed herein may be implemented as electronic hardware, or combinations of computer software and electronic hardware. Whether such functionality is implemented as hardware or software depends upon the particular application and design constraints imposed on the implementation. Skilled artisans may implement the described functionality in varying ways for each particular application, but such implementation decisions should not be interpreted as causing a departure from the scope of the present invention.

It is clear to those skilled in the art that, for convenience and brevity of description, the specific working processes of the above-described systems, apparatuses and units may refer to the corresponding processes in the foregoing method embodiments, and are not described herein again.

In the embodiments provided in the present invention, it should be understood that the disclosed apparatus and method may be implemented in other ways. For example, the above-described apparatus embodiments are merely illustrative, and for example, the division of the units is only one logical division, and other divisions may be realized in practice, for example, a plurality of units or components may be combined or integrated into another system, or some features may be omitted, or not executed. In addition, the shown or discussed mutual coupling or direct coupling or communication connection may be an indirect coupling or communication connection through some interfaces, devices or units, and may be in an electrical, mechanical or other form.

The units described as separate parts may or may not be physically separate, and parts displayed as units may or may not be physical units, may be located in one place, or may be distributed on a plurality of network units. Some or all of the units can be selected according to actual needs to achieve the purpose of the solution of the embodiment.

In addition, functional units in the embodiments of the present invention may be integrated into one processing unit, or each unit may exist alone physically, or two or more units are integrated into one unit.

The functions, if implemented in the form of software functional units and sold or used as a stand-alone product, may be stored in a computer readable storage medium. Based on such understanding, the technical solution of the present invention may be embodied in the form of a software product, which is stored in a storage medium and includes instructions for causing a computer device (which may be a personal computer, a server, or a network device) to execute all or part of the steps of the method according to the embodiments of the present invention. And the aforementioned storage medium includes: u disk, removable hard disk, ROM, RAM, magnetic disk or optical disk, etc.

Furthermore, it is to be noted that in the device and method of the invention, it is obvious that the individual components or steps can be decomposed and/or recombined. These decompositions and/or recombinations are to be considered equivalents of the present invention. Also, the steps of performing the above-described series of processes may naturally be performed in chronological order in the order described, but need not necessarily be performed in chronological order, and some steps may be performed in parallel or independently of each other. It will be understood by those skilled in the art that all or any of the steps or elements of the method and apparatus of the present invention may be implemented in any computing device (including processors, storage media, etc.) or network of computing devices, in hardware, firmware, software, or any combination thereof, which can be implemented by those skilled in the art using their basic programming skills after reading the description of the present invention.

Thus, the objects of the invention may also be achieved by running a program or a set of programs on any computing device. The computing device may be a general purpose device as is well known. The object of the invention is thus also achieved solely by providing a program product comprising program code for implementing the method or device. That is, such a program product also constitutes the present invention, and a storage medium storing such a program product also constitutes the present invention. It is to be understood that the storage medium may be any known storage medium or any storage medium developed in the future. It is further noted that in the apparatus and method of the present invention, it is apparent that each component or step can be decomposed and/or recombined. These decompositions and/or recombinations are to be regarded as equivalents of the present invention. Also, the steps of executing the series of processes described above may naturally be executed chronologically in the order described, but need not necessarily be executed chronologically. Some steps may be performed in parallel or independently of each other.

While the preferred embodiments of the present invention have been described, it will be understood by those skilled in the art that various changes and modifications may be made without departing from the spirit and scope of the invention as defined in the appended claims.

Claims

1. A method for transmitting a random access preamble sequence, the method being applied to a terminal and comprising:

transmitting a random access preamble sequence on the time-frequency resource.

2. The method of transmitting the random access preamble sequence of claim 1, wherein the random access preamble sequence formats include M formats; the time domain length corresponding to at least one of the M formats is n times of a first preset value, the length of the cyclic prefix CP is n times of a second preset value, and n is a positive integer.

3. The method of transmitting a random access preamble sequence as claimed in claim 2, wherein the M formats include: a first format, a second format, a third format, a fourth format, a fifth format, a sixth format, a seventh format, an eighth format, and a ninth format;

Are respectively n times of the second value;

Are respectively (2n + 1). 72 k.2^-μ、(4n+1)·72κ·2^-μ、(6n+1)·72κ·2^-μ、(12n+1)·72κ·2^-μ；

Wherein, k is T_s/T_c＝64，T_s＝1/(△f_ref·N_f,ref)，T_c＝1/(△f_max·N_f)，Δf_max＝480·10³Hz，N_f＝4096，△f_ref＝15·10³Hz，N_f,ref＝2048；μ∈{2,3,[4]…}；

The sixth value is kept unchanged.

4. The method of claim 2 or 3, wherein the random access configuration information comprises 2 consecutive^μ-3Binding PRACH time slots of physical random access channels into a sub-block, wherein mu is more than or equal to 3; the random access configuration information further comprises at least one of the following parameters:

the number of PRACH occasions in one sub-block;

time domain symbol length of PRACH occasion in one sub-block

Number of symbols occupied by PRACH time domain of each random access channel

Wherein,

the number of PRACH occasions in the time domain in one PRACH time slot is

5. The method of transmitting a random access preamble sequence according to claim 4, wherein,

if the number of PRACH occasions in the time domain in one PRACH time slot

if the number of PRACH occasions in the time domain in one PRACH time slot

Meaningless;

if the number of PRACH occasions in the time domain in one PRACH time slot

Greater than 1 and non-integer, the PRACH opportunity number is right

The resulting value is rounded down.

6. The method of transmitting a random access preamble sequence according to claim 4, wherein,

if it is not

if it is not

7. The method of transmitting the random access preamble sequence according to claim 1, wherein the random access preamble sequence format comprises M + L formats; the first M formats include: a first format, a second format, a third format, a fourth format, a fifth format, a sixth format, a seventh format, an eighth format, and a ninth format; l is an integer greater than or equal to 1;

Is a second value;

Is a fourth value;

Is the sixth value.

8. The method of transmitting a random access preamble sequence according to claim 7, wherein,

time domain length N corresponding to M + L1 th format_μ＝n_A·2048κ·2^-μLength of cyclic prefix CP

Wherein n is_AWhen L1 is a positive integer and has different values, n is the same_ADifferent;

9. The method of claim 1, 2 or 8, wherein determining time-frequency resources for transmitting the random access preamble sequence according to the preamble sequence format comprises:

determining the validity of a PRACH opportunity in a sub-block bound by a plurality of PRACH time slots;

10. The method of claim 9, wherein transmitting the random access preamble sequence on the time-frequency resource comprises:

11. The transmission method of a random access preamble sequence of claim 10, wherein the first time interval Gap for beam switching is located at the beginning of each RO.

12. The transmission method of a random access preamble sequence according to claim 11, wherein a time domain structure of each RO is the same; or,

the first symbol of each RO is used for beam switching as a whole.

13. The method of transmitting a random access preamble sequence of claim 11, wherein the second time interval Gap for beam switching is located on a symbol where beam switching occurs.

14. The method of transmitting a random access preamble sequence according to claim 13, wherein,

the second time interval Gap is located at the head of the symbol where the beam switching occurs, and the remaining part of the symbol is used for transmitting the cyclic prefix CP of the symbol set on the corresponding beam; or,

the second time interval Gap is located in the middle of the symbol where the beam switching occurs, a portion before the second time interval Gap is used for performance enhancement, and a portion after the second time interval Gap is used for a cyclic prefix CP for transmitting the symbol set on the corresponding beam.

15. The transmission method of a random access preamble sequence as claimed in claim 11, wherein the number of times a beam can be switched within one RO does not exceed n.

16. The method of transmitting a random access preamble sequence according to claim 15, wherein,

if the random access procedure is triggered by higher layers, a corresponding parameter is introduced in the higher layers for indicating the number of beams used within an RO, the number of beams being log₂n bits to indicate;

if the random access procedure is triggered by PDCCH signaling, a new information field is introduced in PDCCH format 1-0 or the number of beams used within one RO is indicated by reserved bits, which are log₂n bits.

17. The method of transmitting a random access preamble sequence according to claim 11, wherein,

18. The transmission method of a random access preamble sequence as claimed in claim 11, wherein the order of switching the transmission beams within the same RO comprises:

19. The method of claim 18, wherein if the random access procedure is triggered by a higher layer signaling, the terminal performs downlink synchronization block detection, determines whether an actual RSRP measurement value of a synchronization block is greater than an RSRP threshold obtained from a system broadcast message, and if so, uses a beam corresponding to the synchronization block as a center beam;

if the random access procedure is triggered by PDCCH signaling, the terminal uses the PDCCH signaling to designate a beam corresponding to the synchronization block as a center beam.

20. The method of transmitting a random access preamble sequence of claim 19, wherein the method further comprises, after the m beams are configured:

21. A method for receiving a random access preamble sequence, the method being applied to a network device and comprising:

22. The method for receiving a random access preamble sequence according to claim 21, wherein the random access preamble sequence transmitted by the receiving terminal on the time-frequency resource transmitting the random access preamble sequence comprises:

If the corresponding receiving beam of the network equipment can not cover the transmitting beams of the m terminals, but the network equipment switches the receiving beams, the network equipment firstly determines a central receiving beam according to the association relation between the RO resource for detecting the lead code and the downlink transmitting beam, selects m-1 beams closest to the central beam to switch the beams and receives the same RO; and on the rest m-1 beams, the beams are switched from large to small or from small to large according to the corresponding synchronous block index of each beam to receive the rest part of the content of the RO.

23. A terminal, comprising: the transceiver, the processor, the memorizer, store the procedure that the said processor can carry out on the said memorizer; the processor implements, when executing the program: receiving random access configuration information, wherein the time domain symbol number occupied by a lead code sequence format in the random access configuration information is larger than a preset value; determining time-frequency resources for sending random access preamble sequences according to the preamble sequence format; transmitting a random access preamble sequence on the time-frequency resource.

24. The terminal of claim 23,

the random access preamble sequence formats include M formats; the time domain length corresponding to at least one of the M formats is n times of a first preset value, the length of the cyclic prefix CP is n times of a second preset value, and n is a positive integer.

25. The terminal of claim 24, wherein the M formats comprise: a first format, a second format, a third format, a fourth format, a fifth format, a sixth format, a seventh format, an eighth format, and a ninth format;

Are respectively n times of the second value;

The sixth value is kept unchanged.

26. The terminal of claim 24 or 25, wherein the processor is further configured to:

in the random access configuration information, 2 is continuous^μ-3Binding PRACH time slots of physical random access channels into a sub-block, wherein mu is more than or equal to 3; the random access configuration information further comprises at least one of the following parameters:

the number of PRACH occasions in one sub-block;

time domain symbol length of PRACH occasion in one sub-block

Number of symbols occupied by PRACH time domain of each random access channel

Wherein,

the number of PRACH occasions in the time domain in one PRACH time slot is

27. The terminal of claim 26,

if the number of PRACH occasions in the time domain in one PRACH time slot

if the number of PRACH occasions in the time domain in one PRACH time slot

Meaningless;

if the number of PRACH occasions in the time domain in one PRACH time slot

Greater than 1 and non-integer, the PRACH opportunity number is right

The resulting value is rounded down.

28. The terminal of claim 26,

if it is not

if it is not

29. The terminal of claim 23, wherein the random access preamble sequence format comprises M + L formats; the first M formats include: a first format, a second format, a third format, a fourth format, a fifth format, a sixth format, a seventh format, an eighth format, and a ninth format; l is an integer greater than or equal to 1;

Is a second value;

Is a fourth value;

Is the sixth value.

30. The terminal of claim 29,

31. The terminal according to claim 23 or 24 or 29, wherein determining time-frequency resources for transmitting a random access preamble sequence according to the preamble sequence format comprises:

32. The terminal of claim 31, wherein sending a random access preamble sequence on the time-frequency resource comprises:

33. The terminal of claim 32,

the first time interval Gap for beam switching is located at the beginning of each RO.

34. The terminal of claim 33,

the time domain structure of each RO is the same; or,

the first symbol of each RO is used for beam switching as a whole.

35. The terminal of claim 32,

the second time interval Gap for beam switching is located on the symbol where beam switching occurs.

36. The terminal of claim 35,

37. The terminal of claim 32,

dividing the RO into m parts equally in time domain according to the configured or preconfigured number m of available beams in the same RO for the symbol position used for beam switching, wherein the remaining m-1 parts of first symbols except the first part in the m parts of beams are all used for beam switching;

38. The terminal of claim 32, wherein the order of switching the transmission beams within the same RO is as follows:

39. The terminal of claim 38, wherein if the random access procedure is triggered by a higher layer signaling, the terminal performs detection of a downlink synchronization block, determines whether an actual RSRP measurement value of the synchronization block is greater than an RSRP threshold obtained from a system broadcast message, and if so, uses a beam corresponding to the synchronization block as a center beam;

40. The terminal of claim 39, wherein after the m beams are configured, the processor is further configured to switch between the beams in which each part of the content of the RO is transmitted according to a descending order or a descending order of the sync block index corresponding to each beam.

41. An apparatus for transmitting a random access preamble sequence, the apparatus being applied to a terminal, the apparatus comprising:

the receiving and sending module is used for receiving random access configuration information, and the number of time domain symbols occupied by a lead code sequence format in the random access configuration information is larger than a preset value;

the processing module is used for determining time-frequency resources for sending the random access preamble sequence according to the preamble sequence format;

42. A network device, comprising: the transceiver, the processor, the memorizer, store the procedure that the said processor can carry out on the said memorizer; the processor implements, when executing the program: sending random access configuration information, wherein the time domain symbol number occupied by a lead code sequence format in the random access configuration information is larger than a preset value; and receiving the random access preamble sequence transmitted by the terminal on the time-frequency resource for transmitting the random access preamble sequence.

43. A receiving device for random access preamble sequence is characterized in that it is applied to network equipment

The receiving and sending module is used for sending random access configuration information, and the number of time domain symbols occupied by a lead code sequence format in the random access configuration information is larger than a preset value; and receiving the random access preamble sequence transmitted by the terminal on the time-frequency resource for transmitting the random access preamble sequence.

44. A processor-readable storage medium having stored thereon processor-executable instructions for causing a processor to perform the method of any of claims 1 to 20 or to perform the method of any of claims 21 to 22.