CN108322282B

CN108322282B - Generation method, indication method and device of random access leader sequence

Info

Publication number: CN108322282B
Application number: CN201710398587.XA
Authority: CN
Inventors: 钱辰; 喻斌; 熊琦; 张英杰
Original assignee: Samsung Electronics Co Ltd
Current assignee: Samsung Electronics Co Ltd
Priority date: 2017-01-16
Filing date: 2017-05-31
Publication date: 2021-11-12
Anticipated expiration: 2037-05-31
Also published as: CN108322282A; KR102514774B1; KR20180084669A

Abstract

The application discloses a method for generating a random access leader sequence, which comprises the following steps: receiving random access configuration information, wherein the random access configuration information includes preamble sequence resource pool information, and the preamble sequence resource pool information includes: the available base sequences; generating M sequences according to the basic sequence, wherein M is larger than 1; and generating a random access leader sequence according to the M sequences. The application also discloses a device for generating the random access leader sequence, a method and a device for indicating the random access configuration information. By applying the technical scheme disclosed by the application, the method can adapt to the medium-high frequency band multi-beam operation in 5G, and the performance of the system in the random access process is improved.

Description

Generation method, indication method and device of random access leader sequence

Technical Field

The present application relates to the field of wireless communications technologies, and in particular, to a method and an apparatus for generating a random access preamble sequence, and a method and an apparatus for indicating random access configuration information.

Background

With the rapid development of the information industry, especially the growing demand from the mobile internet and internet of things (IoT), the future mobile communication technology is challenged with unprecedented challenges. As can be expected from international telecommunication union ITU's report ITU-R M. [ imt. beyond 2020.TRAFFIC ], by 2020, mobile TRAFFIC will increase by nearly 1000 times in relation to 2010 (era 4G), and the number of user equipment connections will also exceed 170 billion, and will be even more dramatic as the vast number of IoT devices gradually permeates into mobile communication networks. To address this unprecedented challenge, the communications industry and academia have developed an extensive fifth generation mobile communications technology research (5G) facing the 2020. Future 5G frameworks and overall goals are currently discussed in ITU's report ITU-R M [ imt.vision ], wherein the 5G demand landscape, application scenarios and various important performance indicators are specified. For the new requirements in 5G, ITU's report ITU-R M [ imt. user TECHNOLOGY TRENDS ] provides information related to the technical trend for 5G, aiming at solving significant problems of significant improvement of system throughput, consistency of user experience, scalability to support IoT, latency, energy efficiency, cost, network flexibility, support of emerging services, and flexible spectrum utilization.

The performance of random access directly affects the user experience. In conventional wireless communication systems, such as LTE and LTE-Advanced, a Random Access procedure is applied to multiple scenarios, such as establishing an initial link, performing cell handover, re-establishing an uplink, and re-establishing an RRC connection, and is divided into Contention-based Random Access (Contention-based Random Access) and non-Contention-based Random Access (Contention-free Random Access) according to whether a user has exclusive use of a preamble sequence resource. In contention-based random access, in the process of attempting to establish uplink, each user selects a preamble sequence from the same preamble sequence resource pool, and a situation that a plurality of users select the same preamble sequence to send to a base station may occur, so a collision resolution mechanism is an important research direction in random access. How to reduce the collision probability and how to quickly solve the collision which has occurred are key indexes affecting the random access performance.

The contention-based random access procedure in LTE-a is divided into four steps, as shown in fig. 1:

step one, a user randomly selects a leader sequence from a leader sequence resource pool and sends the leader sequence to a base station; the base station performs correlation detection on the received signal, thereby identifying the preamble sequence sent by the user.

And secondly, the base station sends a Random Access Response (RAR) to the user, wherein the RAR comprises a Random Access leader sequence Identifier, a timing advance instruction determined according to time delay estimation between the user and the base station, a Temporary Cell Radio Network Temporary Identifier (C-RNTI) and a time-frequency resource distributed for the next uplink transmission of the user.

And thirdly, the user sends a third message (Msg3) to the base station according to the information in the RAR. The Msg3 includes information such as a user terminal identifier that is unique to the user and used to resolve the conflict, and an RRC connection request.

Fourthly, the base station sends conflict resolution identification to the user, wherein the conflict resolution identification comprises the user terminal identification of the user which wins the conflict resolution. If the user detects the own identity from the temporary C-RNTI, upgrading the temporary C-RNTI into the C-RNTI, sending an ACK signal to the base station, finishing the random access process and waiting for the scheduling of the base station; otherwise, the user will start a new random access procedure after a delay.

For a non-contention based random access procedure, since the base station knows the user identity, the user may be assigned a preamble sequence. Therefore, when the user sends the preamble sequence, the user does not need to randomly select the sequence, and the allocated preamble sequence is used. After detecting the allocated preamble sequence, the base station sends a corresponding random access response, including information such as timing advance and uplink resource allocation. And after receiving the random access response, the user considers that the uplink synchronization is finished and waits for the further scheduling of the base station. Therefore, the non-contention based random access procedure only comprises two steps: step one, a terminal sends a leader sequence to a base station; and step two, the base station sends a random access response to the terminal.

The preamble sequence format in existing LTE specifies the sequence length of the preamble sequence and the length of the corresponding cyclic prefix. For the multi-beam operation in the 5G middle and high frequency bands, it is necessary to consider both the terminal with the beam reciprocity and the terminal without the beam reciprocity, and also consider the cell coverage requirement. In addition, considering that in a high-frequency band wireless communication environment, frequency offset caused by phase noise is serious, a preamble sequence format in LTE at present cannot meet the random access requirement in 5G, and a new preamble sequence format and a preamble sequence generation method need to be developed to meet the access requirement of 5G.

Disclosure of Invention

The application provides a method and a device for generating a random access leader sequence and a method and a device for indicating random access configuration information, which are suitable for 5G medium-high frequency band multi-beam operation and improve the performance of a system random access process.

The application discloses a method for generating a random access leader sequence, which comprises the following steps:

receiving random access configuration information, wherein the random access configuration information includes preamble sequence resource pool information, and the preamble sequence resource pool information includes: the available base sequences;

generating M sequences according to a basic sequence in the available basic sequences, wherein M is larger than 1;

and generating a random access leader sequence according to the M sequences.

Preferably, the generating the random access preamble sequence according to the M sequences includes:

and generating M corresponding time domain sequences according to the M sequences, adding a Cyclic Prefix (CP) in front of each of the M time domain sequences, sequentially connecting the M time domain sequences added with the CP end to end, and adding a guard interval (GT) behind the last sequence to obtain a random access preamble sequence.

Preferably, the generating the corresponding M time domain sequences according to the M sequences includes: and generating corresponding M time domain sequences according to the M sequences and the waveform information indicated by the base station.

Preferably, the generating M sequences according to a base sequence of the available base sequences includes: using one of the available base sequences as each of the M sequences.

Preferably, the preamble resource pool information further includes: an available set of cyclic shifts;

the generating M sequences from ones of the available base sequences comprises: and performing corresponding cyclic shift on one of the available base sequences according to each cyclic shift parameter in one of the available cyclic shift groups, respectively, to obtain the M sequences.

Preferably, the preamble resource pool information further includes: available cyclic shift groups and available orthogonal codes;

the generating M sequences from ones of the available base sequences comprises: respectively performing corresponding cyclic shift on one of the available base sequences according to each cyclic shift parameter in one of the available cyclic shift groups to obtain the M intermediate sequences; and processing the M intermediate sequences by adopting one of the available orthogonal codes to obtain the M sequences.

Preferably, the preamble resource pool information further includes: available orthogonal codes;

the generating M sequences from ones of the available base sequences comprises: and processing one of the available basic sequences by adopting one of the available orthogonal codes to obtain the M sequences.

Preferably, the generating M sequences according to a base sequence of the available base sequences includes: and respectively taking each of the S basic sequences in the available basic sequences as the basic sequence, and respectively adopting the cyclic shift group in the available cyclic shift group and/or the orthogonal code in the available orthogonal code to perform corresponding processing to obtain M _ S sequences, wherein M is M _ S S, M _ S is more than or equal to 2, and S is more than or equal to 2.

Preferably, the generating M sequences according to a base sequence of the available base sequences includes: and performing corresponding processing on one of the available basic sequences by adopting one of the available cyclic shift groups and one of the available orthogonal codes to obtain M _ S sequences, and repeating the M _ S sequences for S times to obtain the M sequences, wherein M is M _ S, M is not less than 2, and S is not less than 2.

Preferably, the generating M sequences according to a base sequence of the available base sequences includes: and performing corresponding processing on one basic sequence in the available basic sequences by adopting at least one cyclic shift group in the available cyclic shift groups and/or at least one orthogonal code in the available orthogonal codes to obtain M sequences.

Preferably, ,

processing the sequence with the orthogonal code includes: the elements of the orthogonal code are multiplied respectively on the corresponding sequences.

Preferably, the base sequence used for generating the M sequences is selected by the terminal from available base sequences or configured by the base station to the terminal from available base sequences;

the cyclic shift group used for cyclically shifting the basic sequence is selected by the terminal from the available cyclic shift group or configured to the terminal by the base station from the available cyclic shift group;

the orthogonal codes used for processing the sequences are selected by the terminal from available orthogonal codes or configured to the terminal by the base station from available orthogonal codes.

Preferably, the cyclic shift parameter in the cyclic shift group is related to a cell identity.

Preferably, the generation manner of the cyclic shift group is as follows:

wherein,

for the cyclic shift corresponding to the m sequence of the i cyclic shift, parameter N_csIs the difference in cyclic shift between the two sequences,

for the maximum cyclic shift that is allowed for,

an initial cyclic shift for the ith set of cyclic shifts, the

Associated with the cell identity.

Preferably, the initial cyclic shift of the 0 th cyclic shift group is generated by:

wherein,

for cell identification, function f (-) is to generate 0 to

A pseudo-random function of random numbers in between, the other cyclic shift groups except said 0 th cyclic shift group being based on

And inter-group cyclic shift interval

The linear generation is carried out, and the linear generation,

the function f (-) is generated in the following way:

wherein f is₁，f₂For sum term start and end points, functionThe number c (-) is a pseudo-random generating function, the initial value of which is determined by the cell identity.

Preferably, the identifier of the generated random access preamble sequence includes the following parts: an identifier of the base sequence employed and an index of the cyclic shift group.

Preferably, the identifier of the generated random access preamble sequence includes the following parts: the base sequence identifier employed, the index of the cyclic shift group, and the index of the orthogonal code.

Preferably, the identifier of the generated random access preamble sequence includes the following parts: the base sequence identifier used and the index of the orthogonal code.

Preferably, the identifier of the generated random access preamble sequence includes the following parts: an identifier of the base sequence employed and an index of the cyclic shift group employed and/or an index of the orthogonal code employed.

The application also discloses a device for generating a random access preamble sequence, which comprises: the device comprises a configuration module, a sequence generation module and a leader sequence generation module, wherein:

the configuration module is configured to receive random access configuration information, where the random access configuration information includes preamble sequence resource pool information, and the preamble sequence resource pool information includes: the available base sequences;

the sequence generation module is used for generating M sequences according to the basic sequence, wherein M is larger than 1;

and the leader sequence generating module is used for generating a random access leader sequence according to the M sequences.

The application also discloses a method for indicating the random access configuration information, which comprises the following steps:

sending random access configuration information to a terminal, wherein the random access configuration information comprises leader sequence resource pool information, and the leader sequence resource pool information comprises: available base sequences, cyclic shift groups, and orthogonal codes;

and receiving a random access leader sequence generated according to the leader sequence resource pool information from the terminal.

Preferably, the parameters in the cyclic shift group satisfy the condition: after each cyclic shift group is adopted to carry out cyclic shift on each basic sequence, the basic sequence cannot be obtained, and the cyclic shifts among different cyclic shift groups do not interfere with each other.

The application also discloses a random access configuration information indicating device, including: a transmitting module and a receiving module, wherein:

the sending module is configured to send random access configuration information to a terminal, where the random access configuration information includes preamble sequence resource pool information, and the preamble sequence resource pool information includes: available base sequences, cyclic shift groups, and orthogonal codes;

the receiving module is configured to receive a random access preamble sequence generated according to the preamble sequence resource pool information from a terminal.

The application also discloses a method for generating the random access leader sequence, which comprises the following steps:

performing downlink synchronization, determining an optimal synchronization signal block according to the energy of a primary synchronization signal and a secondary synchronization signal in the detected synchronization signal block, and reading the synchronization signal block index and the random access channel configuration information in the system information carried by a broadcast channel in the synchronization signal block index;

generating a random access leader sequence according to the configuration information of the random access channel, and sending the random access leader sequence on the configured or selected random access channel resource; wherein: the random access channel configuration information includes preamble sequence resource pool information and corresponding cover code words.

Preferably, the cover code is an orthogonal cover code.

Preferably, the cover code is a sequence-based cover code;

after determining the optimal synchronization signal block, the method further comprises: determining the index of the synchronous signal block or the index of the corresponding downlink transmission beam according to at least one of a main synchronous signal, a secondary synchronous signal and system information carried in a broadcast channel and reference signal information inserted in the synchronous channel block;

the generating of the random access preamble sequence according to the random access channel configuration information includes: and generating a cover code corresponding to the synchronous channel block according to the determined index and a preset cover code generation mode, and processing the generated preamble sequence to obtain a final preamble sequence.

Preferably, the generating a random access preamble sequence according to the random access channel configuration information includes: and selecting a corresponding covering code to generate a random access leader sequence according to the beam reciprocity capability of the terminal.

According to the technical scheme, the method and the device can adapt to the operation of the high-frequency band multi-beam in the 5G band by improving the format and the generation mode of the random access leader sequence, can allocate the leader sequence more flexibly, and can better resist the frequency deviation caused by phase noise, thereby improving the performance of the system in the random access process.

In addition, according to the method for generating the random access preamble sequence disclosed by the application, the optimal synchronization signal block is determined from the plurality of synchronization signal blocks through downlink synchronization, and the random access preamble sequence is generated by reading the synchronization signal block index and the random access channel configuration information in the system information carried by the broadcast channel, so that the random access problem under the multi-beam system can be solved, and the performance of the system random access process is improved.

Drawings

Fig. 1 is a diagram illustrating a conventional contention-based random access procedure;

fig. 2 is a diagram illustrating a random access preamble sequence format according to a first embodiment of the present application;

fig. 3 is a schematic diagram illustrating a preamble sequence generation method according to an embodiment of the present application;

FIG. 4 is a diagram illustrating the relationship between cyclic shifts according to an embodiment of the present application;

FIG. 5 is a diagram illustrating a preamble identifier according to an embodiment of the present application;

fig. 6 is a schematic diagram of a preamble sequence structure adopted in the second embodiment of the present application;

fig. 7 is a schematic diagram illustrating a generation manner of a preamble sequence in the second embodiment of the present application;

fig. 8 is a preamble sequence identifier structure in an alternative implementation of the present application;

fig. 9 is a schematic diagram illustrating an indication relationship between a downlink broadcast channel and a random access channel resource in a second embodiment of the present application;

FIG. 10 is a diagram illustrating a preamble sequence structure in the third embodiment of the present application;

fig. 11 is a block diagram of an apparatus for generating a preferred random access preamble sequence according to the present invention;

fig. 12 is a schematic diagram illustrating a structure of a preferred apparatus for indicating random access configuration information according to the present application.

Detailed Description

In order to make the objects, technical solutions and advantages of the present application more apparent, the present application is further described in detail below by referring to the accompanying drawings and examples.

The application provides a method for generating a random access leader sequence, which comprises the following specific processes:

and the terminal receives the random access configuration information transmitted by the base station side. The configuration information includes preamble sequence resource pool information. Wherein the preamble sequence resource pool information at least includes: the basic sequence that is available. Preferably, the method further comprises the following steps: available cyclic shift parameters and/or available orthogonal codes, etc. Preferably, the cyclic shift parameter is in the form of a group, which may also be referred to as a cyclic shift group.

According to the leader sequence resource pool information in the received random access configuration information, the terminal generates M sequences according to the basic sequences in the available basic sequences, wherein M is larger than 1; and then adding a Cyclic Prefix (CP) in front of each sequence of the M sequences, sequentially connecting the M sequences added with the CP end to end, and adding a guard interval (GT) behind the last sequence to obtain a random access leader sequence.

The method for generating the M sequences by the terminal according to the basic sequences in the available basic sequences comprises the following steps:

s1, generating M intermediate sequences according to a basic sequence and a cyclic shift group selected randomly or configured by a base station on the basis of the basic sequence;

and S2, on the basis of the M intermediate sequences generated in the step S1, generating M sequences according to orthogonal codes randomly selected or configured by the base station.

After M sequences are obtained, a random access leader sequence is obtained according to the method, and then a baseband signal is generated according to the structure of the random access leader sequence.

It should be noted that, because uplink transmission may use a plurality of different waveforms, such as OFDM or SC-FDMA, the base station notifies the terminal through the broadcast channel to send waveform information used by the preamble sequence, after the terminal generates M sequences according to steps S1 and S2, the terminal generates corresponding M time domain sequences according to the waveform information indicated in the broadcast channel or preset waveform information, and then adds CP and GT on the basis of the M time domain sequences to finally obtain the random access preamble sequence.

Compared with the prior art, the method provided by the invention can provide more available preamble sequences, can reduce the inter-cell interference by means of cyclic shift randomization and the like, provides better coverage capability, and can better support multi-beam operation in a high-frequency-band wireless communication environment.

The technical solution of the present application is further described in detail by several preferred embodiments.

Example one

In this embodiment, a random access preamble sequence generation method will be described with reference to a specific system. Assuming that the system works in a high frequency band, in order to make up for the serious path loss in a high frequency band wireless communication environment, the base station and the terminal both adopt a beam forming or mixed beam forming mode, and obtain beam forming gain by matching beam pairs at the transmitting end and the receiving end.

In the scheme provided in this embodiment, the format of the random access preamble sequence is shown in fig. 2.

As shown in fig. 2, the random access preamble sequence of this embodiment is composed of a plurality of identical or different sequences (sequence 1, sequence 2 … …, sequence M shown in fig. 2), a Cyclic Prefix (CP) is added before each sequence, and a Guard interval (Guard Time, GT) is added after all sequences. In the present embodiment, a method of generating the preamble sequence will be described by taking a case where the sequences are different from each other as an example.

Different sequences in the leader sequence are generated using the same base sequence. The base sequence is a Zadoff-Chu sequence (ZC sequence) having a cyclic shift orthogonal characteristic. The basic sequence is obtained by the terminal randomly selecting with equal probability in a preamble sequence resource pool configured by the base station, or is obtained by the base station configuration (for example, a contention-free random access process). Different ones of the preamble sequences are generated by different cyclic shifts of the base sequence. For example, the base sequence is cyclically shifted according to the cyclic shift group, and the cyclic shift of the mth sequence is C_mWherein M is the serial number of the cyclic shift in the cyclic shift group, and M is more than or equal to 1 and less than or equal to M. The cyclic shift group or the generation mode of the cyclic shift parameter is notified to the terminal by the base station through the random access channel configuration information or configured in a preset mode. Another configuration is that the base station uses a possible cyclic shift group as a part of a random access preamble sequence resource pool to notify terminals in a cell in a broadcast manner, and when the terminals have a random access requirement, one cyclic shift group is randomly selected from available cyclic shift groups with equal probability from the random access preamble sequence resource pool to be used for generating each sequence forming a preamble sequence by combining with the selected basic sequence. In addition, for the contention-free random access procedure adopted by the terminal working in the connected state, the basic sequence and the corresponding cyclic shift group configuration information are both configured by the base station.

After a plurality of sequences are generated, the terminal selects Orthogonal Cover Code (OCC), and multiplies corresponding elements on each sequence to obtain M sequences. For example, the orthogonal cover code selected is: w ═ w (1),. ·, w (m)]Then the m-th sequence after treatment is

Wherein, the sequence

For generation by cyclic shift of basic sequenceThe m-th sequence of (1), sequence d_mThe element w (m) is the mth element of the orthogonal cover code for the sequence after multiplication by the orthogonal cover code. The selected orthogonal superposition codes can be Walsh codes, DFT-based orthogonal codes, etc. according to the difference in the number of sequences constituting the preamble sequence. For example, a Walsh code of length 2 or 4 can be written as:

and

wherein each row in the matrix represents an orthogonal sequence. That is, for Walsh codes of length 2, the number of selectable orthogonal codes is 2; for a length-4 Walsh code, the maximum number of orthogonal codes that can be selected is 4.

Taking an orthogonal code with a length of 3 as an example, designing the orthogonal code based on DFT specifically includes:

wherein, each row in the matrix represents an orthogonal sequence, and the number of available orthogonal sequences is 3.

The selectable orthogonal code sequence is notified to the terminal through the random access configuration information and is configured to the terminal in a preset mode, and the terminal selects from the selectable orthogonal code sequence with equal probability; for a terminal working in a connection state, when a random access process based on non-competition needs to be initiated, an orthogonal code sequence is configured by a base station.

The above-described manner of generating the preamble sequence can be briefly described with reference to fig. 3.

In fig. 3, the sequence and parameter selection includes: selection and generation of base sequences, selection of cyclic shift parameters and orthogonal sequences, and the like. The parameter w (m) is the mth element in the selected (or configured) orthogonal sequence. The sequence generation comprises: a time domain sequence is generated, and CP and the last GT of the preamble sequence are added.

Hypothesis baseThe length of each sequence of the sequence, i.e., the leader sequence, is N_preThe basic sequence selected by the terminal from the resource pool or configured by the base station is x_uThe nth element is x_u(n)，0≤n≤N_pre1, the subscript u means the u-th root sequence of the available ZC sequences.

One way to represent cyclic shifts is: for the mth sequence, the cyclically shifted sequence is: x is the number of_u，m(n)＝[x_u(n+C_m)]mod N_pre. This approach is applicable to the case where the preamble sequence is generated in the time domain, for example, using the waveform configuration of the SC-FDMA waveform, the cyclic shift parameters in the cyclic shift group are defined and configured in the time domain.

Another way to represent cyclic shift is: for the mth sequence, the cyclically shifted sequence is:

wherein alpha is_mAnd the aforementioned C_mIs in a relation of_m＝2πC_m/N_pre. This approach is applicable to the case where the preamble sequence is generated in the frequency domain, for example, using the waveform configuration of the OFDM waveform, the cyclic shift parameters in the cyclic shift group are defined and configured on the frequency domain.

Considering that the cyclic shift parameters have a one-to-one correspondence relationship in the definition of the frequency domain or the time domain, the base station only transmits the parameters related to the cyclic shift group of the time domain or the frequency domain, and the terminal determines the implementation mode of the cyclic shift according to the used waveform.

The orthogonal sequence is w, the mth element of the orthogonal sequence is w (M), wherein M is more than or equal to 0 and less than or equal to M-1, and M is the length of the orthogonal sequence, namely the number of sequences in the leader sequence. The mth sequence after being processed by time domain spreading (i.e. orthogonal cover code) is represented as: y is_u，m(n)＝w(m)x_u，m(n) of (a). Sequence y_u，mThe mth sequence is obtained through baseband signal generation (i.e., time domain signal generation).

As a specific example of the above case, a plurality of sequences constituting one preamble sequence may use the same cyclic shift. At this point, different base sequences may be characterized by different cyclic shifts, and thus there are no steps of cyclic shift in the corresponding implementation in fig. 3.

Similarly, as a special case of the example shown in fig. 3, a plurality of sequences constituting one preamble sequence may use different cyclic shifts while not using orthogonal code spreading. Accordingly, in the implementation shown in fig. 3, there is no step of multiplying by the spreading factor w (i) after the cyclic shift.

To reduce inter-Cell interference, generation of the cyclic shift may be correlated with a Cell identity (Cell ID). For example, one way to generate a cyclic shift group associated with a cell identity can be represented as:

wherein,

and the cyclic shift corresponding to the m sequence of the i cyclic shift group. Parameter N_csIs the difference in cyclic shift between the two sequences,

for the maximum cyclic shift that is allowed for,

the parameter is related to the cell identity for the initial cyclic shift of the ith set of cyclic shifts. One possible way is that the initial cyclic shift of the 0 th group of cyclic shifts is generated in the following way:

wherein,

for cell identification, function f (-) is to generate 0 to

A pseudo-random function of the random number in between. Other cyclic shift groups may be based on

And inter-group cyclic shift interval

The linear generation is performed, in general,

a simple way to generate the function f (-) is:

wherein f is₁，f₂For the start and end of the summation term, the function c (-) is a pseudo-randomly generated function, for example using a generation based on an M-sequence or a Gold sequence, the initial value of which is determined by the cell identity.

In order to satisfy the requirement that cyclic shifts between different cyclic shift groups do not generate collision and a cyclic shifted base sequence does not become other base sequences, the cyclic shift of the base sequence and the relationship between the cyclic shifts in the cyclic shift groups should satisfy the relationship shown in fig. 4.

FIG. 4 illustrates an example relationship where a base sequence is selected and then cyclically shifted to not become another base sequence; the cyclic shifts between different groups do not interfere with each other.

In this embodiment, the preamble resource pool information includes: basic sequence information, available cyclic shift group information, and available orthogonal sequence information. The information of the leader sequence resource pool is informed to the terminal through the master information block or the system information block indicated by the master information block in the broadcast channel through the random access configuration information. For a terminal needing to adopt a random access process based on competition, a basic sequence, a cyclic shift group and an orthogonal sequence are randomly selected in a preamble sequence resource pool with equal probability, and a preamble sequence is generated by adopting the mode. For a terminal needing to adopt a contention-free random access process, information for generating a preamble sequence is directly configured by a base station, namely the base station notifies a configured basic sequence, cyclic shift group information and orthogonal sequence information.

The terminal generates a preamble sequence according to the above method, and sends the preamble sequence on the random access channel resource configured by the base station. For a terminal without beam reciprocity and needing to try a plurality of transmission beam directions, the structure can use the same transmission beam to transmit in the random access channel resource, the base station configures a plurality of random access channel resources, and the terminal uses different transmission beams to transmit the random access preamble sequence on different random access channel resources. Alternatively, different sequences are transmitted using different transmit beams.

If the base station detects the sending of the leader sequence, the base station sends a random access response in a corresponding random access response detection window. The random access response includes preamble sequence identifier, timing advance information, and base station allocated temporary cell radio network temporary identity (TC-RNTI), etc. In this embodiment, the preamble identifier may be composed of the following components: a base sequence identifier, a cyclic shift group index, and an orthogonal code index, as shown in fig. 5.

The length of the base sequence identifier is determined by the number of the base sequences, the length of the cyclic shift group index is determined by the number of the available cyclic shift groups, and the length of the orthogonal code index is determined by the length of the available orthogonal code. And the base station determines the content of the preamble sequence identifier according to the detected preamble sequence and sends the content in the random access response.

The terminal determines whether the preamble sequence identifier detected in the random access response is consistent with the transmitted preamble sequence according to the used preamble sequence generation mode.

Example two

In this embodiment, a method for generating a random access preamble sequence will be described with reference to a specific system. In the first embodiment, a plurality of sequences constituting a preamble sequence are generated from the same basic sequence. In this embodiment, a plurality of sequences constituting one preamble sequence are generated from different basic sequences. In this embodiment, it is still assumed that the system operates in a high frequency band, and multi-beam operation and hybrid beam forming or analog beam forming are adopted to obtain a beam forming gain sufficient to compensate for the path loss.

The preamble sequence structure used in this embodiment is shown in fig. 6.

In the structure shown in fig. 6, one preamble sequence is composed of a plurality of sequences, each of which is preceded by a CP and is followed by a GT. Where every M _ s sequences are generated from the same basic sequence, referred to as a sequence group. Specifically to fig. 6, a preamble sequence is composed of M sequences, where M is an even number. Every two adjacent sequences are generated by the same basic sequence, namely: in the example shown in fig. 6, M _ s is 2, and in practical applications, the value of M _ s may be other values greater than 2. Here, M _ S ≧ 2, S ≧ 2.

Sequences generated from the same base sequence are generated in a manner similar to the previous embodiment, i.e., based on the selected base sequence, or the configured base sequence, and the cyclic shifts in the cyclic shift group, each sequence is generated, and based on the selected or configured orthogonal code, each sequence constituting the preamble sequence is generated. The preamble sequence generation method in this embodiment is shown in fig. 7.

In the scheme shown in fig. 7, S basic sequences, cyclic shift groups, and orthogonal sequences are selected from the preamble resource pool according to the configuration of the preamble resource pool, and each sequence constituting the preamble sequence is generated, and finally, a preamble sequence composed of a plurality of sequences is generated.

In this generation scheme, the preamble sequence identifier is composed of S parts, and each part is composed of a basic sequence identifier, a cyclic shift group index, and an orthogonal sequence index, as shown in fig. 5.

In another simple generation mode, the terminal selects a basic sequence, a cyclic shift group and an orthogonal sequence with equal probability according to the configuration information of the preamble sequence resource pool, and generates M _ s sequences. These M _ S sequences are repeated S times and GT is added at the end of the sequence as a preamble sequence for the random access procedure.

This method differs from the method shown in fig. 7 in that different sequence sets are generated from different base sequences, different cyclic shifts, and different orthogonal codes in the manner shown in fig. 7. In the simple generation method, different sequence groups are generated from the same basic sequence, the same cyclic shift, and the same orthogonal code. The simple generation method described above has an advantage over the generation method shown in fig. 7 in that the length of the preamble identifier can be significantly shortened.

In another implementation manner of the trade-off, the terminal selects a basic sequence from an available resource pool, and selects one or more cyclic shift groups and one or more orthogonal sequences. It is generated in a similar manner to fig. 7. In this manner, the structure of the preamble identifier is shown in fig. 8, and includes: basic sequence identifier, cyclic shift 1 index, orthogonal code 1 index … … cyclic shift S index, orthogonal code S index.

The base station determines a preamble sequence identifier according to the detected preamble sequence and transmits in a random access response. The terminal determines whether the preamble sequence identifiers are matched in the detected random access response according to the preamble sequence randomly selected with equal probability from the preamble sequence resource pool when the preamble sequence is sent or the preamble sequence configured by the base station.

EXAMPLE III

This embodiment provides a mapping relationship between a downlink broadcast channel and a random access resource in combination with the random access preamble sequence structure provided by the present invention. In this embodiment, the system uses multi-beam operation, i.e. a large coverage is achieved by multiple narrow beams. Meanwhile, the base station employs a plurality of synchronization signal blocks, each of which includes a primary synchronization signal, a secondary synchronization signal, and a broadcast channel. Each synchronization signal block corresponds to different or same base station side transmission beams. The broadcast channel in the transmit beam block informs the time-frequency resource location information of the random access channel corresponding to the corresponding synchronization signal block (or broadcast channel) and the corresponding random access preamble sequence resource pool information through the system information carried on the broadcast channel.

In this embodiment, the broadcast channels in the multiple synchronization signal blocks indicate the same time-frequency resource of the random access channel, and different synchronization signal blocks use different or the same downlink transmission beams. Fig. 9 is a schematic diagram illustrating an indication relationship between a downlink broadcast channel and a random access channel resource in this embodiment.

In fig. 9, the base station uses N downlink synchronization signal blocks (denoted by SS block1 to SS block N in the drawing) for downlink synchronization. Each synchronization signal block is transmitted using one downlink transmission beam. In the example shown in fig. 9, different synchronization signal blocks use different downlink transmission beams. In practical applications, different synchronization signal blocks may use the same downlink transmission beam. One or more random access channel time-frequency resources are distributed in the uplink channel, and the random access channel time-frequency resources indicated by the plurality of synchronous signal blocks are the same. In the example shown in fig. 9, the random access channel time-frequency resources indicated by two synchronization signal blocks are the same, for example: both SS block1 and SS block2 indicate RACH 1. The time frequency resource of the random access channel is configured through the random access channel configuration in the system information. It should be noted that the number of the synchronization signal blocks corresponding to the time-frequency resources of different random access channels may be different.

The random access channel configuration in the system information configures random access preamble sequence resource pool information. The random access preamble sequence resource pools of different random access channel time-frequency resources can be configured with the same random access preamble sequence. Different synchronization signal blocks need to be distinguished (so that different downlink transmission beams are implicitly indicated), different synchronization signal blocks of the same random access channel time-frequency resource are indicated, and when the random access preamble sequence resource pool is indicated, the mutually disjoint random access preamble sequence resource pools need to be indicated, so as to determine that the base station determines the downlink transmission beam for transmitting the random access response by transmitting the time-frequency resource of the preamble sequence and the synchronization signal block information.

A simple indication method is to indicate the starting index and the number of the preamble sequence indexes in the preamble sequence resource pool or indicate the starting index and the ending index of the preamble sequence in the preamble sequence resource pool by using the preamble sequence index when indicating the preamble sequence resource pool, so as to mark the preamble sequence index range in the preamble sequence resource pool.

If the preamble sequence generation method provided by the present invention is adopted, the complete random access preamble sequence is composed of a plurality of different preamble sequences, and the plurality of different preamble sequences can be obtained by one or a plurality of basic sequences through cyclic shift and orthogonal cover code processing, then a simple allocation method of the preamble sequence resource pool is as follows:

the leader sequence resource pool comprises two parts: a preamble sequence (or a combination of a base sequence and a cyclic shift group) and an orthogonal cover code. The preamble resource pool indicated in one random access channel configuration contains only one code sub of the orthogonal cover code. The preamble sequence format corresponding to the above description can be represented by fig. 10.

In fig. 10, the length of the orthogonal cover code used is 2, and is represented by w ═ w1 w2]Wherein w1 and w2 are real numbers. The random access preamble sequence is composed of a plurality of sequences, and each element of two adjacent sequences is multiplied by w1 and w2 respectively. In a more general description, the orthogonal cover code has a length of n_occThe multiplication may be performed before IDFT (or IFFT) or after IDFT (or IFFT). And after the CP is added to each generated sequence, the sequences are cascaded to form a random access preamble sequence.

The plurality of sequences constituting the same random access preamble sequence may be different sequences in the preamble sequence resource pool, or may be generated by one sequence in the preamble sequence resource pool through a plurality of cyclic shifts. For the former, the random access leader sequence resource pool is composed of a plurality of leader sequences and an orthogonal cover code word, and the terminal selects the plurality of leader sequences to form the random access leader sequence; for the latter, the random access preamble resource pool is composed of one or more basic sequences, a plurality of cyclic shift groups and one orthogonal cover code codeword, and the terminal selects the basic sequences and the cyclic shift groups to form the random access preamble sequence.

N processed with the same orthogonal cover code_occA plurality of consecutive sequences, which may be a plurality of randomly selected sequences in a random access preamble sequence resource pool, orThe random access preamble sequence resource pool comprises a plurality of sequences formed by cyclic shift of a basic sequence in the random access preamble sequence resource pool, or a plurality of sequences formed by repeating a sequence in the random access preamble sequence resource pool, and the like.

The aforementioned orthogonal cover codes may be orthogonal sequences, such as Walsh codes, DFT codewords. When the orthogonal code word is adopted, the index of the corresponding code word is preset in a lookup table mode, and the index of the corresponding orthogonal code word is informed when the random access channel configuration information is configured. Table 1 shows an example of a Walsh code codebook index of length 2, table 2 shows an example of a DFT codebook index of length 3, and table 3 shows an example of a Walsh code codebook index of length 4.

Table 1: walsh code codebook index of length 2

Index	Code word
		0	[+1 +1]
1	[+1 -1]

Table 2: length 3 DFT codebook index

Table 3: walsh code codebook index of length 4

Index	Code word
		0	[+1 +1 +1 +1]
1	[+1 +1 -1 -1]
		2	[+1 -1 -1 +1]
3	[+1 -1 +1 -1]

The codewords in the codebook are only examples, and other orthogonal code codebooks can be used as the orthogonal cover codes. In addition to the above examples, the cover code may use quasi-orthogonal code words. A simple example is a polynomial generator polynomial that is predetermined to generate a pseudo-random sequence in advance using a polynomial-based pseudo-random sequence such as an M-sequence or a Gold sequence, with the initial state of the M-sequence being related to the index of the synchronization signal block used. For example, the sequence generated is w (i) ═ c (i + N)_c) Wherein N is_cAnd intercepting the starting position for the pseudo-random sequence, wherein the starting position is configured by high-level signaling. The function c (n) is a pseudo-random sequence generation function, which can be an M sequence or a Gold sequence. The initial state of the M sequence is c_init＝f(N_ss) (ii) a In the case of Gold sequences, one possible way is to fix the initial state of one of the M sequences and the initial state of the other M sequence is c_init＝f(N_ss). Wherein N is_ssFor selected lines of the synchronization signal blockF (N) of_ss) Is equal to N_ssA function of the correlation. The cover code generated in this way is represented as: w ═ w (1),.. ang.w (N)_occ)]The multiple preamble sequences selected by the terminal or the multiple preamble sequences generated by cyclic shift of one or more basic sequences selected by the terminal, each element of the ith sequence is multiplied by w (i), converted to the time domain, added with CP and cascaded to form the random access preamble sequence. Or a plurality of leader sequences selected by the terminal or a plurality of leader sequences generated by cyclic shift of one or a plurality of basic sequences selected by the terminal, after converting to the time domain, each element of the ith sequence is multiplied by w (i), and CP is added and cascaded to form the random access leader sequence.

If the scheme provided by this embodiment is adopted with orthogonal cover codes, the behavior of the terminal side can be briefly described as follows:

the method comprises the following steps: and performing downlink synchronization to acquire the configuration information of the random access channel. Specifically, according to the energy of a primary synchronization signal and a secondary synchronization signal in a received and detected synchronization signal block, an optimal synchronization signal block is determined; and reading the synchronization signal block index and the random access channel configuration information in the system information carried by the broadcast channel.

Step two: and generating a random access preamble sequence according to the configuration information of the random access channel, and sending the random access preamble sequence on the configured or selected random access channel resource. The random access channel configuration information includes preamble sequence resource pool information and corresponding orthogonal cover code words.

If the terminal adopts the sequence-based cover code, the terminal acts as follows:

the method comprises the following steps: and (4) downlink synchronization. And determining the optimal synchronous signal block according to the detection energy of the primary synchronous signal and the secondary synchronous signal in the received and detected synchronous signal block. The optimal synchronization signal block means a synchronization signal block with the largest detection energy.

Step two: and determining the index of the synchronous signal block or the index of the corresponding downlink transmission beam according to at least one of the main synchronous signal, the secondary synchronous signal and the system information carried in the broadcast channel and the reference signal information inserted in the synchronous channel block.

Step three: and generating a cover code corresponding to the synchronous channel block according to the determined index and a preset cover code generation mode, processing the generated preamble sequence, generating a final preamble sequence, and transmitting the final preamble sequence on the configured or selected random access channel resource.

If the scheme provided by this embodiment is adopted, the base station side behavior can be briefly described as follows:

the method comprises the following steps: and the base station configures and transmits the downlink synchronous signal.

Step two: the base station receives and detects the random access preamble sequence.

Step three: and the base station determines a downlink transmission beam for transmitting the random access response according to the time-frequency resource information of the random access channel and the leader sequence information.

If the terminal uses a sequence-based cover code, the base station behavior can be described as follows:

Step three: and the base station determines a downlink transmission beam for transmitting the random access response according to the time-frequency resource information of the random access channel and the information of the leader sequence (the information of the covering code on the leader sequence).

Meanwhile, the preamble sequence distinguishing method can be used for distinguishing terminals with beam reciprocity from terminals without beam reciprocity. In particular, terminals with and without beam reciprocity multiplex the same random access channel time-frequency resource. As mentioned previously, the preamble resource pool consists of two parts: a preamble sequence (or a combination of a base sequence and a cyclic shift group) and a cover code. Since the preamble sequence resource pools used by terminals with and without beam reciprocity are partially the same preamble sequence (or a combination of a base sequence and a cyclic shift group), the two preamble sequence resource pools use different cover codes, such as different orthogonal cover code words or cover codes generated by different sequences.

After the terminal reads the system information, a leader sequence is selected from all available leader sequences (or the combination of a basic sequence and a cyclic shift group) according to equal probability, or the leader sequence distributed by the base station (or the combination of the basic sequence and the cyclic shift group) is used, and a corresponding covering code is selected according to the terminal beam reciprocity capability to generate a final random access leader sequence which is sent on a corresponding random access channel time-frequency resource.

Example four

In this embodiment, a communication flow between a terminal and a base station using the preamble sequence generation method provided by the present invention will be described.

In this embodiment, the synchronization signal block is composed of a primary synchronization signal, a secondary synchronization signal, and a broadcast channel. To accommodate multi-beam operation in high-band wireless communications, different symbols of each synchronization signal block are transmitted by the same base station downlink beam, and different synchronization signal blocks are transmitted using the same or different base station downlink transmit beams. In the broadcast channel in the synchronization signal block, a master Information block is sent, where the master Information block includes some Information necessary for accessing the network, including the System frame number, the position of the synchronization signal block in the radio frame (e.g., the time index of the synchronization signal block, etc.), scheduling Information of Remaining Minimum System Information (RMSI) (e.g., control Information time-frequency resource configuration Information of RMSI, etc.), System bandwidth Information, etc.

The RMSI includes random access configuration information. The random access configuration information includes random access channel configuration information, preamble sequence resource pool information, and the like. For the multi-beam operating system, the base station needs to determine the downlink transmission beam for the base station to transmit the random access response according to the corresponding relationship between the synchronization signal block (or the corresponding downlink signal) and the time-frequency resource and the preamble sequence of the random access channel. When multiple synchronization signal blocks are mapped to the same time-frequency resource of the random access channel, the downlink signal (or the synchronization signal block) corresponding to the terminal needs to be notified through the grouping of the preamble sequence to determine the downlink transmission beam.

If the RMSI transmission content is the same for different downlink transmission directions, the random access configuration information in the RMSI needs to notify the terminal of the random access configuration information corresponding to all the synchronization signal blocks.

This embodiment will mainly describe a notification method of the random access preamble resource pool. In this embodiment, the random access configuration information includes: the random access channel configuration information corresponding to the synchronous signal block, and the random access preamble sequence resource pool information corresponding to the synchronous signal block. In the invention, the random access preamble sequence resources corresponding to different downlink signals are distinguished by adopting a covering code mode, and the informing mode can be adopted as follows: a. the preamble sequence resource pool is divided into a sequence resource pool and a cover code resource. The same sequence resource pool is adopted for random access configuration corresponding to different downlink signals, and different covering codes are adopted for random access configuration corresponding to different sending beams. b. The preamble sequence resource pool is divided into a sequence resource pool and a cover code resource. Different sequence resource pools are adopted for random access configuration corresponding to different downlink signals, and different covering codes are adopted for random access configuration corresponding to different sending beams. c. The above two ways are combined, for example, the same or different sequence resource pools are used for random access configurations corresponding to different downlink signals, and different cover codes are used for random access configurations that use the same sequence resource pool but do not use downlink transmission beams.

For the notification method of the cover code resource, the possible notification methods are as follows:

1. only the available set of orthogonal cover codes is informed and the cover codes used by the synchronization signal blocks are determined according to a predefined correspondence or a correspondence indicated in the RMSI. One possible way is to determine the corresponding cover code from the index of the synchronization signal block. A simple example is to use orthogonal cover codes of length M, with index n_SSThe cover code index corresponding to the synchronization signal block is:

m_SS=mod(n_SS，M)

wherein mod () is a modulo operation.

Another simple example is to use orthogonal cover codes of length M with index n_SSThe cover code index corresponding to the synchronization signal block is:

the first approach is equivalent to indexing adjacent sync signal blocks with different orthogonal cover codes, i.e. assuming that adjacent sync signal blocks may be mapped to the same random access time-frequency resource. For example, M is 2, the number of synchronization signal blocks is 16, and the orthogonal cover code codeword indexes corresponding to different synchronization signal blocks are:

the second scheme [ 0101010101010101 ] is equivalent to that the same orthogonal cover code can be used to index adjacent synchronization signal blocks, for example, M equals 2, and the number of synchronization signal blocks is 16, and the orthogonal cover code codeword indexes corresponding to different synchronization signal blocks are:

[ 0011001100110011 ] in the above manner, only the available cover code words and the corresponding indexes need to be informed. If the rule of correspondence is determined in a predefined manner, no additional information notification is required. In addition, the corresponding rules may also be notified by the RMSI.

2. The available orthogonal cover code sets are informed and the corresponding orthogonal cover code codeword index for each synchronization signal block is informed in the RMSI. The RMSI arranges the cover code index corresponding to each synchronization signal block according to the index of the synchronization signal block, and notifies the RMSI of a sequence formed by the index. Taking M as 2 and the number of sync signal blocks as 16 as an example, the sequence of indexes notified in the RMSI is:

0010101101010001 in the above example, some different sync signal blocks correspond to the same random access channel time-frequency resource, and different orthogonal cover codes are needed to distinguish different preamble sequences, such as sync signal blocks 1 and 2. The other part of the synchronization signal blocks and the time frequency resources of the corresponding random access channels are in one-to-one correspondence.

When more orthogonal cover code words are available, the signaling overhead required by the method is larger, but more flexible corresponding relation is supported.

3. Both of the above two approaches are applicable to the case where the RMSIs transmitted by different beams are the same. For the case that the RMSIs sent by different beams are different, the RMSIs sent by downlink beams of different base stations may carry their corresponding cover code indexes, except that the method described in the method 1 may still be used.

4. For the case that the sequence resource pools in the random access configurations corresponding to different downlink beams are different, a possible configuration manner is to list the number of sequences in the sequence resource pool in the random access configuration corresponding to each synchronization signal block and the corresponding cover code codeword index in the RMSI according to the sequence of the synchronization signal block indexes. In addition, for the case that the RMSI carried information sent by downlink transmission beams of different base stations is not exactly the same, the RMSI sent by each downlink transmission beam may carry only the number of sequences in the sequence resource pool corresponding to the beam and the code word index of the cover code.

In addition to the several approaches presented above, in some cases, different synchronization signal blocks correspond to different random access time-frequency resources. At this time, the base station can be informed of the corresponding downlink transmission beam information by randomly accessing the time-frequency resource, and a plurality of covering codes are not needed to distinguish the downlink transmission beams. For this case, one possible way is to add the cover code on indication information in the random access configuration information, for example, to add the variable OCC _ flag in the random access configuration information. If the indication information is 1, indicating that a preamble sequence generation mode of a cover code mode is started, and indicating the preamble sequence resources by adopting the mode; if the indication information is 0, it indicates that the preamble sequence generation method of the cover code method is not turned on, and in this method, the preamble sequence generation method based on the cover code is not adopted, or some cover code is considered to be an all-1 sequence. Another possible way is to still adopt the configuration method provided in this embodiment, and for the case where the synchronization signal blocks may occur to correspond to the time-frequency resources of the random access channel one to one, the number of the available cover codes is configured to be 1, and the available cover codes are all 1 sequences. When the cover code on indication is 0, which indicates that the preamble sequence generation method in the cover code form is not adopted, the cover code correlation indication (for example, the cover code index indication and the like) may still exist, but the terminal ignores the correlation indication (that is, the cover code correlation indication is invalid), and still adopts the preamble sequence generation method without using the cover code to generate the preamble sequence.

Another way to configure whether to select the preamble sequence of the cover code mode is to set multiple preamble sequence formats, some of which do not use the preamble sequence generation mode of the cover code mode (or default length of the cover code is 1, or consider the cover code to be a full 1 sequence), and others of which use the preamble sequence generation mode of the cover code mode.

The terminal determines the used random access preamble sequence pool resources in the following way:

and the terminal detects the downlink synchronous signal. The terminal detects one or more synchronous signal blocks with the measuring result higher than a preset threshold value through blind detection. Wherein the measurement result comprises the reference signal received energy of the primary synchronization signal, etc.

The terminal selects a sync signal block according to a predetermined criterion and reads primary system information in a broadcast channel. The criterion is usually to select the sync signal block with the largest measurement result; or one synchronization signal block is selected from the synchronization signal blocks with the equal probability that the measurement result is higher than the preset threshold value. The terminal reads the main system information in the synchronization signal block and acquires the synchronization signal block index.

And the terminal reads the random access configuration information in the RMSI according to the indication in the main system information. The random access configuration information includes time-frequency resource information of a random access channel, format information of a leader sequence, resource pool information of the leader sequence, and the like. And the terminal reads the sequence resource pool information and the cover code index information corresponding to the synchronous signal block index to acquire the leader sequence resource pool information. If the mode of the covering code opening instruction is adopted, the terminal needs to read the covering code opening instruction, if the covering code opening instruction is displayed as 1, namely the covering code related instruction is opened, the sequence resource pool information and the covering code related instruction are read, and the generation mode of the leader sequence of the covering code is adopted. If the cover code opening indication is displayed as 0, namely the cover code related indication is not opened, only the sequence resource pool information is read, but the cover code related indication is not read.

And the terminal generates a leader sequence according to the indication in the random access configuration information and sends the leader sequence on the corresponding time-frequency resource of the random access channel.

The method for the base station to detect and receive the random access preamble sequence is similar to the third embodiment, and briefly described as follows:

the base station detects information on time frequency resources of a random access channel, and if the sending of a leader sequence is detected, downlink sending beams of the base station are determined according to the time frequency resources and the cover code index information;

and the base station determines the optimal synchronous signal block index detected by the terminal according to the corresponding relation between the time-frequency resource and the cover code index and the downlink signal, and determines the optimal downlink transmission beam according to the optimal synchronous signal block index for transmitting the random access response.

It should be noted that the method provided in this embodiment is applicable to the case where the base station has or does not have beam reciprocity. For the case without beam reciprocity, the adaptation may be performed by configuring the preamble sequence format repeated multiple times, and the configuration mode provided in this embodiment is not affected.

Corresponding to the above method, the present application further provides a device for generating a random access preamble sequence, which has a structure as shown in fig. 11, and includes: the device comprises a configuration module, a sequence generation module and a leader sequence generation module, wherein:

Corresponding to the method for generating the random access leader sequence, the application also provides a method for indicating the random access configuration information, which is applied to a base station side and comprises the following steps:

Corresponding to the above method, the present application further provides a device for indicating random access configuration information, which has a structure as shown in fig. 12 and includes: a transmitting module and a receiving module, wherein:

The above description is only exemplary of the present application and should not be taken as limiting the present application, as any modification, equivalent replacement, or improvement made within the spirit and principle of the present application should be included in the scope of protection of the present application.

Claims

1. A method for generating a random access preamble sequence, comprising:

generating a random access leader sequence according to the M sequences;

wherein,

the generating M sequences from ones of the available base sequences comprises:

processing one of the available basic sequences by adopting one of the available orthogonal codes to obtain one of the M sequences;

the identifier of the generated random access preamble sequence includes the following parts: the base sequence identifier used and the index of the orthogonal code.

2. The method of claim 1, wherein: the generating of the random access preamble sequence according to the M sequences includes:

and generating M corresponding time domain sequences according to the M sequences and waveform information indicated by the base station, adding a Cyclic Prefix (CP) in front of each of the M time domain sequences, sequentially connecting the M time domain sequences added with the CP end to end, and adding a guard interval (GT) behind the last sequence to obtain a random access preamble sequence.

3. The method of claim 1, wherein the preamble sequence resource pool information further comprises: available orthogonal codes;

the generating M sequences from a base sequence of the available base sequences further comprises at least one of:

A. using one of the available base sequences as each of the M sequences;

B. respectively performing corresponding cyclic shift on one basic sequence in the available basic sequences according to each cyclic shift parameter in one cyclic shift group in the available cyclic shift groups to obtain the M sequences; wherein the preamble sequence resource pool information further includes: an available set of cyclic shifts; the identifier of the generated random access preamble sequence includes the following parts: an identifier of the employed base sequence and an index of the cyclic shift group;

C. respectively carrying out corresponding cyclic shift on one basic sequence in the available basic sequences according to each cyclic shift parameter in one cyclic shift group in the available cyclic shift groups to obtain M intermediate sequences; processing the M intermediate sequences by adopting one of available orthogonal codes to obtain M sequences; wherein the preamble sequence resource pool information further includes: available cyclic shift groups and available orthogonal codes; the identifier of the generated random access preamble sequence includes the following parts: the base sequence identifier employed, the index of the cyclic shift group, and the index of the orthogonal code.

4. The method of claim 3, wherein C comprises at least one of:

taking each of the S basic sequences in the available basic sequences as the basic sequence, and performing corresponding processing by using a cyclic shift group in the available cyclic shift group and/or an orthogonal code in the available orthogonal code to obtain M _ S sequences, wherein M _ S is M _ S, M _ S is greater than or equal to 2, and S is greater than or equal to 2; wherein the identifier of the generated random access preamble sequence comprises the following parts: an identifier of the employed base sequence, an index of the employed cyclic shift group, and an index of the employed orthogonal code;

performing corresponding processing on one basic sequence in the available basic sequences by adopting one cyclic shift group in the available cyclic shift group and one orthogonal code in the available orthogonal codes to obtain M _ S sequences, and repeating the M _ S sequences for S times to obtain the M sequences, wherein M is M _ S S, M _ S is more than or equal to 2, and S is more than or equal to 2;

performing corresponding processing on one basic sequence in the available basic sequences by adopting at least one cyclic shift group in the available cyclic shift groups and at least one orthogonal code in the available orthogonal codes to obtain M sequences; wherein the identifier of the generated random access preamble sequence comprises the following parts: an identifier of the base sequence employed, an index of the cyclic shift group employed, and an index of the orthogonal code employed.

5. The method according to claim 3 or 4, characterized in that:

6. The method according to claim 3 or 4, characterized in that:

the basic sequence used for generating the M sequences is selected by the terminal from the available basic sequences or configured to the terminal by the base station from the available basic sequences;

7. The method according to claim 3 or 4, characterized in that:

the cyclic shift parameter in the cyclic shift group is related to a cell identity;

the generation mode of the cyclic shift group is as follows:

wherein,

for the maximum cyclic shift that is allowed for,

an initial cyclic shift for the ith set of cyclic shifts, the

Associated with a cell identity;

wherein, the generation mode of the initial cyclic shift of the 0 th cyclic shift group is as follows:

wherein,

for cell identification, function f (-) is to generate 0 to

And inter-group cyclic shift interval

The linear generation is carried out, and the linear generation,

the function f (-) is generated in the following way:

wherein f is₁，f₂The function c (-) is a pseudo-randomly generated function for the summation term starting and ending points, with the initial value determined by the cell identity.

8. An apparatus for generating a random access preamble sequence, comprising: the device comprises a configuration module, a sequence generation module and a leader sequence generation module, wherein:

the sequence generation module is used for generating M sequences according to the available basic sequences, wherein M is larger than 1; processing one basic sequence in the available basic sequences by adopting one orthogonal code in the available orthogonal codes to obtain one sequence in the M sequences; the identifier of the generated random access preamble sequence includes the following parts: the adopted basic sequence identifier and the index of the orthogonal code;

9. The generation apparatus according to claim 8, characterized in that: the preamble sequence generation module is configured to:

10. The generating apparatus of claim 8, wherein the preamble sequence resource pool information further comprises: available orthogonal codes;

the sequence generation module is used for

A. Using one of the available base sequences as each of the M sequences;

and/or

11. The generation apparatus of claim 10, wherein C comprises at least one of:

12. The generation apparatus according to claim 10 or 11, characterized in that: the sequence generation module is to:

and processing the sequences by adopting orthogonal codes, and multiplying the corresponding sequences by the elements of the orthogonal codes respectively.

13. The generation apparatus according to claim 12, characterized in that:

14. The generation apparatus according to claim 12, characterized in that:

the generation mode of the cyclic shift group is as follows:

wherein,

cyclically shift the ith groupCyclic shift corresponding to the mth sequence of (1), parameter N_csIs the difference in cyclic shift between the two sequences,

for the maximum cyclic shift that is allowed for,

an initial cyclic shift for the ith set of cyclic shifts, the

Associated with a cell identity;

wherein,

for cell identification, function f (-) is to generate 0 to

And inter-group cyclic shift interval

The linear generation is carried out, and the linear generation,

the function f (-) is generated in the following way:

15. A method for indicating random access configuration information is characterized by comprising the following steps:

sending random access configuration information to a terminal, wherein the random access configuration information comprises leader sequence resource pool information, and the leader sequence resource pool information comprises: the available base sequences;

a random access preamble sequence is received from a terminal,

wherein the random access preamble sequence is generated according to M sequences, the M sequences are generated by the terminal according to a basic sequence in the available basic sequences, and M is greater than 1; processing one basic sequence in the available basic sequences by adopting one orthogonal code in the available orthogonal codes to obtain one sequence in the M sequences; the identifier of the generated random access preamble sequence includes the following parts: the base sequence identifier used and the index of the orthogonal code.

16. The method of claim 15, wherein: the leader sequence resource pool information further comprises a cyclic shift group and an orthogonal code;

the parameters in the cyclic shift group satisfy the condition: after each cyclic shift group is adopted to carry out cyclic shift on each basic sequence, the basic sequence cannot be obtained, and the cyclic shifts among different cyclic shift groups do not interfere with each other.

17. An apparatus for indicating random access configuration information, comprising: a transmitting module and a receiving module, wherein:

the sending module is configured to send random access configuration information to a terminal, where the random access configuration information includes preamble sequence resource pool information, and the preamble sequence resource pool information includes: the available base sequences;

the receiving module is used for receiving a random access preamble sequence from a terminal;

wherein,

the random access preamble sequence is generated according to M sequences, the M sequences are generated by the terminal according to a basic sequence in the available basic sequences, and M is greater than 1; processing one of the available basic sequences by adopting one of the available orthogonal codes to obtain one of the M sequences; the identifier of the generated random access preamble sequence includes the following parts: the base sequence identifier used and the index of the orthogonal code.

18. The apparatus of claim 17, wherein: the preamble sequence resource pool information further includes: a cyclic shift group and an orthogonal code;

19. A method for generating a random access preamble sequence, comprising:

generating a random access leader sequence according to the configuration information of the random access channel, and sending the random access leader sequence on the configured or selected random access channel resource; wherein: the random access channel configuration information comprises leader sequence resource pool information and corresponding covering code words;

the generating of the random access preamble sequence according to the random access channel configuration information includes:

generating M sequences according to a basic sequence in available basic sequences, wherein M is larger than 1; processing one of the available basic sequences by adopting one of the available orthogonal codes to obtain one of the M sequences; the identifier of the generated random access preamble sequence includes the following parts: the adopted basic sequence identifier and the index of the orthogonal code;

and generating a random access leader sequence according to the M sequences.

20. The method of claim 19, wherein: the preamble sequence resource pool information further includes: available orthogonal codes;

the cover code codeword is generated based on an orthogonal code.

21. The method of claim 19, wherein:

the cover code codeword is generated from a sequence-based cover code;

22. The method according to any one of claims 19 to 21, wherein:

the generating of the random access preamble sequence according to the random access channel configuration information includes: and selecting a corresponding covering code to generate a random access leader sequence according to the beam reciprocity capability of the terminal.

23. An apparatus for generating a random access preamble sequence, comprising:

a configuration module, configured to perform downlink synchronization, determine an optimal synchronization signal block according to the energy of the primary synchronization signal and the secondary synchronization signal in the detected synchronization signal block, and read the synchronization signal block index and the random access channel configuration information in the system information carried by the broadcast channel;

a preamble sequence generating module, configured to generate a random access preamble sequence according to configuration information of a random access channel, and generate M sequences according to a basic sequence in available basic sequences, where M is greater than 1; processing one of the available basic sequences by adopting one of the available orthogonal codes to obtain one of the M sequences; the identifier of the generated random access preamble sequence includes the following parts: the adopted basic sequence identifier and the index of the orthogonal code;

generating a random access leader sequence according to the M sequences;

transmitting on the configured or selected random access channel resources; wherein: the random access channel configuration information includes preamble sequence resource pool information and corresponding cover code words.

24. The generation apparatus according to claim 23, characterized in that: the preamble sequence resource pool information further includes: available orthogonal codes;

the cover code codeword is generated based on an orthogonal code.

25. The generation apparatus according to claim 23, characterized in that:

the cover code codeword is generated from a sequence-based cover code;

a configuration module, configured to determine an index of a synchronization signal block or an index of a corresponding downlink transmission beam according to at least one of a primary synchronization signal, a secondary synchronization signal, and system information carried in a broadcast channel, and reference signal information inserted in the synchronization channel block after determining an optimal synchronization signal block;

and the preamble sequence generating module is used for generating the covering code corresponding to the synchronous channel block according to the determined index and a preset covering code generating mode, and processing the generated preamble sequence to obtain a final preamble sequence.

26. The generation apparatus according to any one of claims 23 to 25, characterized in that:

and the preamble sequence generating module is used for selecting a corresponding cover code to generate a random access preamble sequence according to the beam reciprocity capability of the terminal.