KR102514774B1 - Method and apparatus for performing random access - Google Patents

Abstract

The present disclosure relates to a 5th generation (5G) or ^pre -5G communication system for supporting a higher data rate after a ^4th generation (4G) communication system such as Long Term Evolution (LTE). This disclosure includes a method for generating a random access preamble. The method includes receiving random access configuration information, the random access configuration information including preamble resource pool information, the preamble resource pool information including usable base sequences, and one of the available base sequences. Generating M sequences according to a base sequence, and generating a random access preamble according to the M sequences, where M is greater than 1. The present disclosure includes an apparatus for generating a random access preamble and a method and apparatus for indicating random access configuration information. With the technical solution provided by the present disclosure, high frequency band multi-beam operations in 5G can be applied, and system performance can be improved in a random access process.

Description

Method and apparatus for performing random access {METHOD AND APPARATUS FOR PERFORMING RANDOM ACCESS}

The present disclosure relates to the technical field of wireless communication, and more particularly to a method and apparatus for generating random access preamps and a method and apparatus for indicating random access configuration information.

Efforts are being made to develop an improved 5th generation ( ^5G ) communication system or a pre-5G communication system in order to meet the growing demand for wireless data traffic after the commercialization of a 4th generation (4G ⁾ communication system. For this reason, the 5G communication system or pre-5G communication system has been called a Beyond 4G Network communication system or a Post LTE system.

In order to achieve a high data rate, the 5G communication system is being considered for implementation in a mmWave band (eg, 28 GHz or 60 GHz band). In order to mitigate the path loss of radio waves and increase the propagation distance of radio waves in the ultra-high frequency band, beamforming, massive MIMO, and Full Dimensional MIMO (FD-MIMO) are used in 5G communication systems. ), array antenna, analog beam-forming, and large scale antenna technologies are being discussed.

In addition, to improve the network of the system, in the 5G communication system, an evolved small cell, an advanced small cell, a cloud radio access network (cloud RAN), and an ultra-dense network , Device to Device communication (D2D), wireless backhaul, moving network, cooperative communication, CoMP (Coordinated Multi-Points), and reception interference cancellation etc. are being developed.

In addition, in the 5G system, Advanced Coding Modulation (ACM) methods such as FQAM (Hybrid Frequency Shift Keying and Quadrature Amplitude Modulation) and SWSC (Sliding Window Superposition Coding) and advanced access technology FBMC (Filter Bank Multi Carrier) ), Non Orthogonal Multiple Access (NOMA), and Sparse Code Multiple Access (SCMA) are being developed.

The rapid development of the information industry, especially the increasing demand from the mobile Internet and Internet of Things (IoT), creates unprecedented challenges for future mobile communication technologies. According to ITU-R M. [IMT.BEYOND 2020. TRAFFIC] published by the International Telecommunication Union (ITU), by 2020 mobile service traffic will increase by almost 1000 times compared to 2010 (4G era), and user equipment connectivity It is expected that the number of devices will exceed 17 billion, IoT devices will gradually expand into mobile communication networks, and the number of connected devices will further increase. In response to this unprecedented challenge, the communications industry and academic societies have prepared for 2020 by launching extensive research on 5G mobile communications technologies. At ITU's ITU-R M. [IMT.VISION], the future 5G framework and overall goals were discussed, detailing demand forecasts, application scenarios, and various key performance in 5G. In terms of new requirements in 5G, the ITU-R M. [IMT.FUTURE TECHNOLOGY TRENDS] from the ITU to support IoT, latency, energy efficiency, cost, network flexibility, support for new services, and flexible spectrum use. It provides information related to 5G technology trends to address critical issues such as consistency of user experience, significant improvement in system throughput, and scalability.

The performance of random access directly affects the user experience. A random access process for a conventional wireless communication system, eg, long term evolution (LTE) or advanced (LTE-A), is contention-based random access based on whether a user equipment exclusively occupies preamble resources. and contention-free random access, and is applied to various scenarios such as connection reconfiguration, radio resource control (RRC), uplink reconfiguration, cell handover, and initial link establishment. For contention-based random access, since each user equipment selects a preamble from the same preamble resources when attempting uplink configuration, there may be cases in which multiple user equipments select the same preamble and transmit it to the base station. Therefore, a collision resolution mechanism is an important research direction in random access. How to reduce the probability of collisions and how to quickly resolve generated collisions is a key indicator that affects random access performance.

The preamble format in existing LTE specifies the sequence length of the preamble and the length of the corresponding cyclic prefix. Since both a UE with beam reciprocity and a UE without beam reciprocity are considered for high frequency band multi-beam operation in 5G, the demand for cell coverage is also considered. In addition, considering that the frequency deviation caused by phase noise is serious in a high frequency band wireless communication environment, the preamble format in existing LTE cannot satisfy the random access demand in 5G. Therefore, it is necessary to develop a new preamble format and preamble generation method to satisfy the access demand in 5G.

The present disclosure provides a method and apparatus for generating a random access preamble and a method and apparatus for indicating random access configuration information in order to apply high frequency band multi-beam operation in 5G and improve system performance of a random access process.

This disclosure discloses a method for generating random access preamps. The method includes receiving random access configuration information, the random access configuration information including preamble resource pool information, the preamble resource pool information including usable base sequences, and the available base sequences. Generating M sequences according to one of the basic sequences, and generating a random access preamble according to the M sequences, where M is greater than 1.

In addition, the process of generating a random access preamble according to the M sequences,

generating M corresponding time-domain sequences according to the M sequences; adding a cyclic prefix (CP) before each of the M time-domain sequences; A process of continuously connecting an end and an end of the added CP, and a process of adding a guard time (GT) to the end of the last sequence to obtain a random access preamble.

In addition, the process of generating M corresponding time-domain sequences according to the M sequences is a process of generating M corresponding time-domain sequences according to waveform information indicated by the base station and the M sequences. includes

Also, the process of generating M sequences according to one of the available base sequences includes using one of the available base sequences as each of the M sequences.

Also, the preamble support pool information further includes usable cyclic shift groups.

The process of generating M sequences according to one of the available base sequences is to obtain the M sequences according to each cyclic shift parameter of one of the available cyclic shift groups. and performing a corresponding cyclic shift on one of the available base sequences in order to do so.

In addition, the preamble resource pool information further includes usable cyclic shift groups and usable orthogonal codes.

The process of generating M sequences according to one of the available base sequences includes using one of the available orthogonal codes to obtain the M sequences from among the available base sequences. It involves processing one basic sequence.

.In addition, the process of generating M sequences according to one base sequence among the available base sequences uses each of the S base sequences among the available base sequences as one base sequence to obtain M_s sequences. and a process of corresponding processing using one of the available cyclic shift groups and/or one of the available orthogonal codes. here,

.

.In addition, the process of generating M sequences according to one of the available base sequences includes one of the available cyclic shift groups and the available orthogonal codes to obtain M_s sequences. and processing one of the usable base sequences correspondingly using one of orthogonal codes, and repeating the M_s sequences for S times to obtain the M sequences. . here,

.

Also, the process of processing the sequence using the orthogonal code includes multiplying the corresponding element of the orthogonal code by the corresponding sequence.

In addition, the base sequence used to generate the M sequences is selected from the usable base sequences by a terminal or configured by a base station to the terminal from the available base sequences.

A cyclic shift group used to perform a cyclic shift on the base sequence is selected by the terminal from the available cyclic groups or configured by the base station to the terminal from the available cyclic shift groups.

The orthogonal code used to process the sequence is selected by the terminal from the available orthogonal codes or configured by the base station to the terminal from the available orthogonal codes.

In addition, cyclic shift parameters in the cyclic shift group are associated with cell identification (ID).

In addition, the process of generating the cyclic shift group is determined according to the following equation,

Here, C _m ⁱ is the cyclic shift corresponding to the m-th sequence of the i _-th cyclic shift group, parameter N _cs is the cyclic shift difference between the two sequences, N _cs ^max is the maximum allowable cyclic shift, and C _in ⁱ is Indicates the initial cyclic shift of the i-th cyclic shift group, and _Cini ⁱ is related to the cell ID.

The process of generating the initial cyclic shift of the 0th cyclic shift group is determined according to the following equation,

는 0과 N_CS ^groupM-1 간 랜덤 수(number)를 생성하는 의사 난수 함수(pseudorandom function)를 나타내고, 0번째 순환 시프트 그룹을 제외한 나머지 순환 시프트 그룹들은 C-_ini ⁰과 그룹 간(inter-group) 순환 시프트 간격 N_CS ^group에 따라 선형적으로 생성되고,

이다. 상기 함수

를 생성하는 과정은, 하기 수학식에 따라 결정되고,Here, n-- _ID ^cell is the cell ID, function

Represents a pseudorandom function that generates a random number between 0 and N _CS ^group M-1, and the rest of the cyclic shift groups except for the 0th cyclic shift group are between C- _ini ⁰ and the group (inter- group) is linearly generated according to the cyclic shift interval N _CS ^group ,

am. said function

The process of generating is determined according to the following equation,

는 의사 난수 생성 함수를 나타내고, 함수

의 시작 값은 셀 ID에 의해 결정된다.where f ₁ and f ₂ are the starting and ending points of the summation term, the function

denotes a pseudorandom number generating function, and the function

The starting value of is determined by the cell ID.

In addition, the identifier of the generated random access preamble includes the following parts: a base sequence identifier and a cyclic shift group index.

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

In addition, the identifier of the generated random access preamble includes the following parts: base sequence identifier and orthogonal code index

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

This disclosure further discloses an apparatus for generating a random access preamble. The device includes a configuration module, a sequence generation module, and a preamble generation module.

The configuration module receives random access configuration information. The random access configuration information includes preamble resource pool information. The preamble resource pool information includes usable base sequences.

The sequence generation module generates M sequences according to a basic sequence. The M is greater than 1.

The preamble generation module generates a random access preamble according to the M sequences.

This disclosure further includes a method for indicating random access configuration information.

The method includes the steps of transmitting random access configuration information to a terminal, the random access configuration information including preamble resource pool information, and the preamble resource pool information includes available base sequences, cyclic shift groups, and an orthogonal code. include them,

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

In addition, the parameters of the cyclic shift groups satisfy the following conditions: After performing a cyclic shift on each base sequence using each cyclic shift group, another base sequence among available base sequences cannot be obtained and , cyclic shifts between different cyclic shift groups will not interfere with each other.

The present disclosure further includes an apparatus for indicating random access configuration information. The device includes a transmitting module and a receiving module.

The transmitting module transmits random access configuration information to the terminal. The random access configuration information includes preamble resource pool information. The preamble resource pool information includes usable base sequences, cyclic shift groups, and orthogonal codes.

The receiving module receives a random access preamble generated according to the preamble resource pool information from the terminal.

This disclosure further discloses a method for generating a random access preamble.

The method is performed according to the process of performing downlink synchronization and the received power of the primary synchronization signal and the received power of the secondary synchronization signal in the detected synchronization signal block. The process of determining an optimal sync signal block, the process of reading random access channel configuration information and the index of a sync signal block from system information generated by a broadcast channel in the sync signal block, and the random access channel configuration generating a random access preamble according to information; and transmitting the random access preamble through the configured or selected random access channel resource. The random access channel configuration information includes preamble resource pool information and corresponding cover code codewords.

Also, the cover codes may be orthogonal cover codes.

Also, the cover codes may be sequence-based cover codes.

After determining the optimal sync signal block, the method carries out the system information carried in the primary sync signal, the system information carried in the secondary sync signal, and the system information carried in the broadcast channel. In addition, the process of determining the index of the corresponding downlink transmission (Tx) beam and the index of the synchronization signal block according to at least one of the reference signal information inserted into the synchronization channel block.

The process of generating a random access preamble according to the random access channel configuration information includes generating a cover code corresponding to the sync channel block according to a predefined cover code generation method and the determined index to obtain a final preamble; and processing the generated preamble.

In addition, the process of generating the random access preamble according to the random access channel configuration information includes selecting a corresponding cover code for generating the random access preamble according to the beam reciprocity capability of the terminal.

By improving the format and generation method of the random access preamble from the above technical solutions, the present disclosure can be applied to high frequency band multi-beam operation in 5G, and the preamble can be allocated more flexibly and caused by phase noise. The resulting frequency deviation can be further reduced. As a result, system performance of the random access process can be improved.

In addition, in the method for generating a random access preamble of the present disclosure, an optimal synchronization signal block is determined from a plurality of synchronization signal blocks by downlink synchronization, and the random access preamble is transmitted to a broadcast channel of the synchronization signal block. It is generated by reading the random access channel configuration information in the information and the index of the synchronization signal block, and thus, the random access problem in the multi-beam system is solved, and the system performance of the random access process can be improved.

1 illustrates a wireless communication system according to various embodiments of the present disclosure.
2 illustrates a configuration of a base station in a wireless communication system according to various embodiments of the present disclosure.
3 illustrates a configuration of a terminal in a wireless communication system according to various embodiments of the present disclosure.
4 illustrates a configuration of a communication unit in a wireless communication system according to various embodiments of the present disclosure.
5 illustrates signal exchange for conventional contention-based random access.
6 is a flowchart of a terminal in a wireless communication system according to various embodiments of the present disclosure.
7 is a flowchart of a base station in a wireless communication system according to various embodiments of the present disclosure.
8 illustrates another flowchart of a terminal in a wireless communication system according to various embodiments of the present disclosure.
9 shows a schematic diagram of a random access preamble format according to the first embodiment of the present disclosure.
10 shows a schematic diagram of a method for generating a preamble according to the first embodiment of the present disclosure.
11 shows a schematic diagram of a relationship between cyclic shifts according to the first embodiment of the present disclosure.
12 shows a schematic diagram of a preamble identifier according to the first embodiment of the present disclosure.
13 shows a structure diagram of a preamble used in the second embodiment of the present disclosure.
14 shows a schematic diagram of a method of generating a preamble according to a second embodiment of the present disclosure.
15 illustrates the structure of a preamble identifier according to a compromised implementation of the present disclosure.
16 is a schematic diagram of an indication relationship between a downlink broadcast channel and random access channel resources according to a second embodiment of the present disclosure.
17 shows a structure diagram of a preamble according to a third embodiment of the present disclosure.
18 shows a schematic diagram of a configuration structure of an apparatus for generating a random access preamble according to the present disclosure.
19 is a schematic diagram of a configuration structure of a device for indicating random access configuration information according to the present disclosure.

Terms used in the present disclosure are only used to describe a specific embodiment, and may not be intended to limit the scope of other embodiments. Singular expressions may include plural expressions unless the context clearly dictates otherwise. Terms used herein, including technical or scientific terms, may have the same meaning as commonly understood by one of ordinary skill in the art described in this disclosure. Among the terms used in the present disclosure, terms defined in general dictionaries may be interpreted as having the same or similar meanings as those in the context of the related art, and unless explicitly defined in the present disclosure, ideal or excessively formal meanings. not be interpreted as In some cases, even terms defined in the present disclosure cannot be interpreted to exclude embodiments of the present disclosure.

In various embodiments of the present disclosure described below, a hardware access method is described as an example. However, since various embodiments of the present disclosure include technology using both hardware and software, various embodiments of the present disclosure do not exclude software-based access methods.

Hereinafter, the present disclosure relates to an apparatus and method for performing random access in a wireless communication system. Specifically, this disclosure describes techniques for generating a random access preamble and transmitting random access configuration information in a wireless communication system.

In the following description, terms referring to signals, terms referring to channels, terms referring to control information, terms referring to network entities, terms referring to components of a device, etc. are used for convenience of description. it is exemplified Accordingly, the present disclosure is not limited to the terms described below, and other terms having equivalent technical meanings may be used.

In addition, although the present disclosure describes various embodiments using terms used in some communication standards (eg, 3 ^rd Generation Partnership Project (3GPP)), this is only an example for explanation. Various embodiments of the present disclosure may be easily modified and applied to other communication systems.

1 illustrates a wireless communication system according to various embodiments of the present disclosure. 1 illustrates a base station 110, a terminal 120, and a terminal 130 as some of nodes using a radio channel in a wireless communication system. Although FIG. 1 shows only one base station, other base stations identical to or similar to base station 110 may be further included.

Base station 110 is a network infrastructure that provides wireless access to terminals 120 and 130 . The base station 110 has coverage defined as a certain geographic area based on a distance over which a signal can be transmitted. The base station 110 includes 'access point (AP)', 'eNodeB (eNB)', '5G node ( ^5th generation node)', 'wireless point', in addition to the base station. It may be referred to as a 'transmission/reception point (TRP)' or another term having an equivalent technical meaning.

Each of the terminal 120 and terminal 130 is a device used by a user and communicates with the base station 110 through a radio channel. In some cases, at least one of the terminal 120 and the terminal 130 may be operated without user involvement. That is, at least one of the terminal 120 and the terminal 130 is a device that performs machine type communication (MTC) and may not be carried by a user. Each of the terminal 120 and terminal 130 is a 'user equipment (UE)', 'mobile station', 'subscriber station', 'remote terminal', 'remote terminal' other than the terminal. It may be referred to as a 'wireless terminal', 'user device' or other terms having an equivalent technical meaning.

The base station 110, terminal 120, and terminal 130 may transmit and receive wireless signals in a mmWave band (eg, 28 GHz, 30 GHz, 38 GHz, and 60 GHz). At this time, in order to improve the channel gain, the base station 110, the terminal 120, and the terminal 130 may perform beamforming. Here, beamforming may include transmit beamforming and receive beamforming. That is, the base station 110, the terminal 120, and the terminal 130 may assign directivity to a transmitted signal or a received signal. To this end, the base station 110 and the terminals 120 and 130 may select serving beams 112, 113, 121 and 131 through a beam search or beam management procedure. After the serving beams 112, 113, 121, and 131 are selected, communication thereafter can be performed through a resource having a quasi co-located (QCL) relationship with the resource transmitting the serving beams 112, 113, 121, and 131.

If the large-scale characteristics of the channel carrying the symbol on the first antenna port can be inferred from the channel carrying the symbol on the second antenna port, the first antenna port and the second antenna port are said to be in a QCL relationship. can be evaluated. For example, a wide range of properties are delay spread, doppler spread, doppler shift, average gain, average delay, spatial receiver parameter may include at least one of

2 illustrates a configuration of a base station in a wireless communication system according to various embodiments of the present disclosure. The configuration illustrated in FIG. 2 may be understood as a configuration of the base station 110 . Terms such as '... unit' and '... unit' used below refer to a unit that processes at least one function or operation, which may be implemented by hardware or software, or a combination of hardware and software. there is.

Referring to FIG. 2 , the base station includes a wireless communication unit 210, a backhaul communication unit 220, a storage unit 230, and a control unit 240.

The wireless communication unit 210 performs functions for transmitting and receiving signals through a wireless channel. For example, the wireless communication unit 210 performs a conversion function between a baseband signal and a bit string according to the physical layer standard of the system. For example, during data transmission, the wireless communication unit 210 generates complex symbols by encoding and modulating a transmission bit stream. In addition, when receiving data, the wireless communication unit 210 restores a received bit stream by demodulating and decoding a baseband signal.

In addition, the wireless communication unit 210 up-converts the baseband signal into a radio frequency (RF) band signal, transmits the signal through an antenna, and down-converts the RF band signal received through the antenna into a baseband signal. To this end, the wireless communication unit 210 may include a transmit filter, a receive filter, an amplifier, a mixer, an oscillator, a digital to analog converter (DAC), an analog to digital converter (ADC), and the like. Also, the wireless communication unit 210 may include a plurality of transmission/reception paths. Furthermore, the wireless communication unit 210 may include at least one antenna array composed of a plurality of antenna elements.

In terms of hardware, the wireless communication unit 210 may be composed of a digital unit and an analog unit, and the analog unit is composed of a plurality of sub-units according to operating power, operating frequency, etc. It can be. The digital unit may be implemented with at least one processor (eg, a digital signal processor (DSP)).

The wireless communication unit 210 transmits and receives signals as described above. Accordingly, all or part of the wireless communication unit 210 may be referred to as a 'transmitter', 'receiver', or 'transceiver'. Also, in the following description, transmission and reception performed through a wireless channel are used to mean that the above-described processing is performed by the wireless communication unit 210.

The backhaul communication unit 220 provides an interface for communicating with other nodes in the network. That is, the backhaul communication unit 220 converts a bit string transmitted from a base station to another node, for example, another access node, another base station, an upper node, a core network, etc., into a physical signal, and converts a physical signal received from another node into a bit string. convert to

The storage unit 230 stores data such as basic programs for operation of the base station, application programs, and setting information. The storage unit 230 may include volatile memory, non-volatile memory, or a combination of volatile and non-volatile memories. Also, the storage unit 230 provides stored data according to the request of the control unit 240 .

The controller 240 controls overall operations of the base station. For example, the control unit 240 transmits and receives signals through the wireless communication unit 210 or the backhaul communication unit 220 . Also, the control unit 240 writes data to and reads data from the storage unit 230 . In addition, the control unit 240 may perform functions of a protocol stack required by communication standards. According to another implementation example, the protocol stack may be included in the wireless communication unit 210 . To this end, the controller 240 may include at least one processor.

According to various embodiments, the controller 240 may transmit random access configuration information to the terminal and receive a random access preamble generated according to the preamble resource pool information from the terminal. For example, the controller 240 may control the base station to perform operations according to various embodiments described below.

3 illustrates a configuration of a terminal in a wireless communication system according to various embodiments of the present disclosure. The configuration illustrated in FIG. 3 may be understood as a configuration of the terminal 120 . Terms such as '... unit' and '... unit' used below refer to a unit that processes at least one function or operation, which may be implemented by hardware or software, or a combination of hardware and software. there is.

Referring to FIG. 3 , the terminal includes a communication unit 310, a storage unit 320, and a control unit 330.

The communication unit 310 performs functions for transmitting and receiving signals through a wireless channel. For example, the communication unit 310 performs a conversion function between a baseband signal and a bit string according to the physical layer standard of the system. For example, during data transmission, the communication unit 310 generates complex symbols by encoding and modulating a transmission bit stream. In addition, when receiving data, the communication unit 310 restores the received bit stream by demodulating and decoding the baseband signal. In addition, the communication unit 310 up-converts the baseband signal into an RF band signal, transmits the signal through an antenna, and down-converts the RF band signal received through the antenna into a baseband signal. For example, the communication unit 310 may include a transmit filter, a receive filter, an amplifier, a mixer, an oscillator, a DAC, and an ADC.

Also, the communication unit 310 may include a plurality of transmission/reception paths. Furthermore, the communication unit 310 may include at least one antenna array composed of a plurality of antenna elements. In terms of hardware, the communication unit 310 may include a digital circuit and an analog circuit (eg, a radio frequency integrated circuit (RFIC)). Here, the digital circuit and the analog circuit may be implemented in one package. Also, the communication unit 310 may include multiple RF chains. Furthermore, the communication unit 310 may perform beamforming.

Also, the communication unit 310 may include different communication modules to process signals of different frequency bands. Furthermore, the communication unit 310 may include a plurality of communication modules to support a plurality of different wireless access technologies. For example, different radio access technologies may include Bluetooth low energy (BLE), Wireless Fidelity (Wi-Fi), WiFi Gigabyte (WiGig), cellular networks (eg, Long Term Evolution (LTE)), etc. In addition, the different frequency bands may include a super high frequency (SHF) (eg, 2.5 GHz, 5 Ghz) band and a millimeter wave (eg, 60 GHz) band.

The communication unit 310 transmits and receives signals as described above. Accordingly, all or part of the communication unit 310 may be referred to as a 'transmitter', a 'receiver', or a 'transceiver'. Also, in the following description, transmission and reception performed through a radio channel are used to mean that the above-described processing is performed by the communication unit 310.

The storage unit 320 stores data such as basic programs for operation of the terminal, application programs, and setting information. The storage unit 320 may include volatile memory, non-volatile memory, or a combination of volatile and non-volatile memories. Also, the storage unit 320 provides stored data according to the request of the control unit 330 .

The controller 330 controls overall operations of the terminal. For example, the control unit 330 transmits and receives signals through the communication unit 310 . Also, the control unit 330 writes data to and reads data from the storage unit 320 . In addition, the controller 330 may perform functions of the protocol stack required by the communication standards. To this end, the controller 330 may include at least one processor or microprocessor, or may be a part of the processor. Also, a part of the communication unit 310 and the control unit 330 may be referred to as a communication processor (CP).

According to various embodiments, the control unit 330 receives random access configuration information, generates a plurality of sequences according to at least one basic sequence among a plurality of basic sequences based on the random access configuration information, and A random access preamble may be generated according to a plurality of sequences, and the random access preamble may be transmitted to the base station. In addition, the control unit 330 determines a synchronization signal block according to the received power of the primary synchronization signal and the received power of the secondary synchronization signal in the downlink synchronization signal, and in the synchronization signal block, the system information delivered by the broadcast channel Random access channel configuration information may be determined, a random access preamble may be generated according to the random access channel configuration information, and the random access preamble may be transmitted through random access channel resources. For example, the controller 330 may control the terminal to perform operations according to various embodiments described below.

4 illustrates a configuration of a communication unit in a wireless communication system according to various embodiments of the present disclosure. FIG. 4 illustrates an example of a detailed configuration of the wireless communication unit 210 of FIG. 2 or the communication unit 310 of FIG. 3 . Specifically, FIG. 4 is a part of the wireless communication unit 210 of FIG. 2 or the communication unit 310 of FIG. 3 and illustrates components for performing beamforming.

Referring to FIG. 4 , a wireless communication unit 210 or communication unit 310 includes an encoding and modulation unit 402, a digital beamforming unit 404, a plurality of transmission paths 406-1 to 406-N, and an analog beamforming unit 408.

The encoding and modulation unit 402 performs channel encoding. For channel encoding, at least one of a low density parity check (LDPC) code, a convolution code, and a polar code may be used. The encoding and modulation unit 402 generates modulation symbols by performing constellation mapping.

The digital beamformer 404 performs beamforming on digital signals (eg, modulation symbols). To this end, the digital beamformer 404 multiplies modulation symbols by beamforming weights. Here, beamforming weights are used to change the amplitude and phase of a signal, and may be referred to as a 'precoding matrix' or a 'precoder'. The digital beamformer 404 outputs digitally beamformed modulation symbols to a plurality of transmission paths 406-1 to 406-N. In this case, according to a multiple input multiple output (MIMO) transmission technique, modulation symbols may be multiplexed or the same modulation symbols may be provided to a plurality of transmission paths 406-1 to 406-N.

Multiple transmit paths 406-1 through 406-N convert digital beamformed digital signals to analog signals. To this end, each of the plurality of transmission paths 406-1 to 406-N may include an inverse fast fourier transform (IFFT) operator, a cyclic prefix (CP) inserter, a DAC, and an up-converter. The CP insertion unit is for an orthogonal frequency division multiplexing (OFDM) method, and may be excluded when another physical layer method (eg, filter bank multi-carrier (FBMC)) is applied. That is, the plurality of transmission paths 406-1 to 406-N provide independent signal processing processes for a plurality of streams generated through digital beamforming. However, depending on the implementation method, some of the components of the plurality of transmission paths 406-1 to 406-N may be used in common.

The analog beamformer 408 performs beamforming on an analog signal. To this end, the digital beamformer 404 multiplies analog signals by beamforming weights. Here, beamforming weights are used to change the magnitude and phase of a signal. Specifically, the analog beamformer 440 may be configured in various ways according to the connection structure between the plurality of transmission paths 430-1 to 430-N and antennas. For example, each of the plurality of transmission paths 430-1 to 430-N may be connected to one antenna array. As another example, multiple transmission paths 430-1 to 430-N may be connected to one antenna array. As another example, the plurality of transmission paths 430-1 to 430-N may be adaptively connected to one antenna array or to two or more antenna arrays.

5 illustrates signal exchange for conventional contention-based random access. 5 illustrates signal exchange between the terminal 120 and the base station 110.

Referring to FIG. 5, in step 501, the terminal selects a preamble from a preamble pool and transmits the preamble to the base station. And, the base station performs correlation detection on the received signal to identify the preamble transmitted by the user.

In step 503, the base station transmits a random access response (RAR) to the user. The RAR is a random access preamble identifier, a time advance instruction determined according to the estimation of the time delay between the terminal and the base station, a temporary cell-radio network temporary identifier (TC-RNTI), and the terminal performs the next uplink transmission It includes time-frequency resources allocated for

In step 505, the terminal transmits message 3 (Msg 3) to the base station according to the information in the RAR. Msg 3 includes information such as a terminal identifier and an RRC link request. The terminal identifier is used to resolve the collision and is a unique identifier for the terminal.

In step 507, the base station transmits a collision resolution identifier to the terminal. The collision resolution identifier includes a UE identifier corresponding to a UE that wins in collision resolution. The terminal promotes the TC-RNTI to the C-RNTI upon detecting the identifier of the terminal, transmits an ACK signal to the base station to complete the random access process, and waits for scheduling of the base station. Otherwise, the terminal starts a new random access process after a specific time.

For the contention-based random access process, since the base station knows the user ID in advance, the base station can allocate a preamble to the terminal. Therefore, when transmitting the preamble, the terminal does not need to randomly select a sequence, but instead uses the assigned preamble. Upon detecting the allocated preamble, the base station transmits a corresponding random access response. The random access response includes information such as timing advance and uplink resource allocation. Upon receiving the random access response, the terminal considers that uplink synchronization is complete and waits for additional scheduling of the base station. In some embodiments, the contention-based random access process may include a process in which a terminal transmits preams to a base station and a process in which the base station transmits a random access response to the terminal.

6 is a flowchart of a terminal in a wireless communication system according to various embodiments of the present disclosure. 6 illustrates the operation of terminal 120.

Referring to FIG. 6 , in step 601, a terminal receives random access configuration information from a base station (eg, base station 110). Here, the random access configuration information may include preamble resource pool information. Preamble resource pool information may include a plurality of base sequences.

In step 603, the terminal generates a plurality of sequences according to at least one basic sequence among a plurality of basic sequences.

In some embodiments, the terminal may use one base sequence of the plurality of base sequences as each of the plurality of sequences.

In some embodiments, the terminal performs a cyclic shift corresponding to one base sequence of the plurality of base sequences according to each cyclic shift parameter in one of the plurality of cyclic shift groups to obtain the plurality of sequences can create them. The preamble resource pool information may further include the plurality of cyclic shift groups. The random access preamble identifier may include at least one of a base sequence identifier and a cyclic shift group index.

In some embodiments, the terminal performs a cyclic shift corresponding to one base sequence of the plurality of base sequences according to each cyclic shift parameter in one of the plurality of cyclic shift groups to obtain a plurality of intermediate (intermediate) sequences can be obtained. The terminal may obtain the plurality of sequences by processing the plurality of intermediate sequences using one orthogonal code among a plurality of orthogonal codes. The preamble resource pool information may further include the plurality of cyclic shift groups and the plurality of orthogonal codes. The random access preamble identifier may include a base sequence identifier, a cyclic shift group index, and an orthogonal code index.

In some embodiments, the terminal may obtain the plurality of sequences by processing one base sequence of the plurality of base sequences using one orthogonal code among the plurality of orthogonal codes. The preamble resource pool information may further include the plurality of orthogonal codes. The random access preamble identifier may include a base sequence identifier and an orthogonal code index.

In some embodiments, the terminal may use each of at least one base sequence among the plurality of base sequences. The terminal processes at least one base sequence among the plurality of base sequences using at least one orthogonal code among the plurality of orthogonal codes and at least one cyclic shift group among the plurality of cyclic shift groups to obtain at least one You can create sequence groups. The terminal may obtain the plurality of sequences by repeating the sequence group at least once. The random access preamble identifier may include at least one of a base sequence identifier, a cyclic shift group index, and an orthogonal code index. In some embodiments, the terminal may multiply the at least one basic sequence by an element of the orthogonal code.

In some embodiments, the base sequence may be selected from the plurality of base sequences by the terminal or configured by the base station from the plurality of base sequences for the terminal. A cyclic shift group used to perform a cyclic shift on the base sequence may be selected from the plurality of cyclic shift groups by the terminal or configured by the base station from the plurality of cyclic shift groups for the terminal. there is. An orthogonal code used to process the base sequence may be selected from the plurality of orthogonal codes by the terminal or constructed by the base station from the plurality of orthogonal codes for the terminal.

In some embodiments, the cyclic shift parameter of the cyclic shift group may be related to cell identification (ID). The cyclic shift group may be determined based on at least one of a cyclic shift difference between two sequences, an allowable maximum cyclic shift, an initial cyclic shift, and the cell ID.

In step 605, the terminal generates a random access preamble according to a plurality of sequences. In some embodiments, the terminal may generate a plurality of time-frequency sequences corresponding to the plurality of sequences and waveform information indicated by the base station. The UE may add a CP before each of a plurality of time-frequency sequences. The terminal may connect the end of multiple time-frequency sequences and the end of the CP. The terminal may add GT to the end of the last sequence.

In step 607, the terminal transmits a random access preamble to the base station.

7 is a flowchart of a base station in a wireless communication system according to various embodiments of the present disclosure. 7 illustrates the operation of base station 110.

Referring to FIG. 7 , in step 701, the base station transmits random access configuration information to a terminal (eg, terminal 120). The random access configuration information may include preamble resource pool information. The preamble resource pool information may include at least one of a plurality of base sequences, cyclic shift groups, and orthogonal codes.

In some embodiments, the parameters in the cyclic shift groups are a first condition that, after performing a cyclic shift on each base sequence using each cyclic shift group, no other base sequence among the plurality of base sequences is obtained and the second condition that cyclic shifts between different cyclic shift groups do not interfere with each other.

In step 703, the base station receives a random access preamble generated according to the preamble resource pool information from the terminal.

8 illustrates another flowchart of a terminal in a wireless communication system according to various embodiments of the present disclosure. 8 illustrates the operation of the terminal 120.

Referring to FIG. 8 , in step 801, a terminal receives a downlink synchronization signal from a base station (eg, base station 110). In step 803, the terminal determines a synchronization signal block according to the received power of the primary synchronization signal and the received power of the secondary synchronization signal in the downlink synchronization signal.

In step 805, the terminal determines random access channel configuration information in the system information delivered by the broadcast channel in the synchronization signal block. The random access channel configuration information may include preamble resource pool information and codewords of corresponding cover codes.

In some embodiments, the cover code may be an orthogonal cover code. In some embodiments, the cover code may be a sequence-based cover code. After determining the synchronization signal block, the terminal determines the system information transmitted through the primary synchronization signal, the system information transmitted through the secondary synchronization signal, and the system information transmitted through the broadcast channel as well as the standard inserted into the synchronization channel block. An index of a corresponding downlink Tx (transmission) beam and an index of the synchronization signal block may be determined according to at least one of the signal information.

In step 807, the terminal generates a random access preamble according to the random access channel configuration information. In some embodiments, the terminal may generate the cover code corresponding to the sync channel block according to the determined index and a predefined cover code generation method. The terminal may process the generated preamble to obtain the last preamble. In some embodiments, the terminal may select the cover code to generate the random access preamble according to the beam reciprocity capability of the terminal.

In step 809, the terminal transmits the random access preamble through random access channel resources.

This disclosure provides a method for generating a random access preamble. The specific flow is as follows.

The terminal receives random access configuration information transmitted from the side of the base station. The configuration information includes preamble resource pool information. Here, the preamble resource pool information includes at least one of usable base sequences. In addition, the preamble resource pool information may further include available cyclic shift parameters and/or available orthogonal codes. Here, too, the cyclic shift parameters are present in groups and, therefore, may be referred to as cyclic shift groups.

The terminal generates M sequences according to one basic sequence among usable basic sequences according to the preamble resource pool information of the received random access configuration information. Here, M is greater than 1, and to obtain a random access preamble, a cyclic prefix (CP) is added before each of the M sequences. The M sequences added together with the CP are continuously connected end-to-end, and a guard time (GT) is added to the end of the last sequence.

Here, a method of generating M sequences according to one base sequence among available base sequences by the terminal includes the following steps.

S1: According to the base sequence and the cyclic shift group randomly selected or configured by the base station, M intermediate sequences are based on the base sequence and generated according to the cyclic shift group.

S2: M sequences are generated according to an orthogonal code randomly selected or configured by the base station based on the M intermediate sequences generated in step S1.

After M sequences are obtained, a random access preamble is obtained according to the method described above, and a baseband signal is generated according to the structure of the random access preamble.

Since uplink transmission can be applied to various different waveforms, for example, OFDM or SC-DFMA, the base station informs the terminal of the waveform information used to transmit the preamble through a broadcast channel. After generating M sequences according to steps S1 and S2, the terminal generates M corresponding time-domain sequences according to waveform information indicated by a broadcast channel or predefined waveform information, and finally random access To obtain a preamble, CP and GT are added based on M time-domain sequences.

Compared with the prior art, the method provided by the present disclosure can provide more usable preambles, can mitigate inter-cell interference, and provide better coverage capability by cyclic shift randomization or other schemes. and can effectively support multi-beam operation in a high frequency band wireless communication environment.

The technical solutions of the present disclosure will be described in detail later by some preferred embodiments.

First embodiment

In the first embodiment, a method of generating a random access preamble will be described with reference to a specific system. It is assumed that the system operates in a high band. In order to compensate for serious path loss in a high frequency band wireless communication environment, a base station and a terminal match beam pairs on a receiver side and a transmitter side and perform beamforming or hybrid beamforming to obtain a beamforming gain. Acquire

9 shows a random access preamble format in the solution provided in the first embodiment.

As shown in FIG. 9, the random access preamble in the first embodiment is composed of a plurality of identical or different sequences (sequence 1, sequence 2, ..., sequence M as shown in FIG. 2). ). CP is added before each sequence, and GT is added at the end of all sequences. In the first embodiment, the method of generating the preamble is described by taking different sequences as examples.

). 순환 시프트 그룹 또는 순환 시프트 파라미터들을 생성하기 위한 방식은 기지국에 의해 랜덤 액세스 채널 구성 정보를 통해 단말에게 알려지거나 미리 정의된 방식으로 구성된다. 다른 구성 방식으로, 기지국은 브로드캐스팅하여 셀의 단말에게 랜덤 액세스 프리앰블 자원 풀의 일부분으로서 가능한 순환 시프트 그룹들을 알린다. 랜덤 액세스 요구가 있을 때, 단말은 동일한 확률로 랜덤 액세스 프리앰블 자원 풀에서의 사용 가능한 순환 시프트 그룹들로부터 하나의 순환 시프트 그룹을 선택하고, 선택된 기본 시퀀스와 결합하여 프리앰블을 형성하는 각 시퀀스를 생성한다. 또한, 연결 상태에서 동작하는 단말에 의해 적용된 비경쟁 랜덤 액세스 프로세스를 위해, 기본 시퀀스와 대응하는 순환 시프트 그룹 구성 정보는 기지국에 의해 구성된다.Different sequences in the preamble are generated from the same base sequence. The base sequence may be a zadoff-chu (ZC) sequence having cyclic shift orthogonal characteristics. The base sequence is selected randomly by the base station or from a preamble resource pool configured by the base station with equal probability by the terminal (eg, contention-free random access process). Different sequences in the preamble are generated from the base sequence by different cyclic shifts. For example, cyclic shifting is performed on a base sequence according to a cyclic shift group. The cyclic shift for the mth sequence is C _m . where m is the sequence number of the cyclic shift in the cyclic shift group (

). A method for generating the cyclic shift group or cyclic shift parameters is known to the terminal through random access channel configuration information by the base station or configured in a predefined manner. In another configuration scheme, the base station broadcasts to inform terminals in the cell of possible cyclic shift groups as part of the random access preamble resource pool. When there is a random access request, the terminal selects one cyclic shift group from available cyclic shift groups in the random access preamble resource pool with equal probability, and generates each sequence forming a preamble by combining with the selected base sequence. . In addition, for a contention-free random access process applied by a terminal operating in a connected state, the base sequence and corresponding cyclic shift group configuration information are configured by the base station.

After multiple sequences are generated, the terminal selects an orthogonal cover code (OCC) and multiplies each sequence by a corresponding element to obtain M sequences. For example, if the selected OCC is w=[w(1), ..., w(M)], the mth sequence processed is d _m =w(m)d _m ^base . The sequence d _m ^base is an m-th sequence generated from a base sequence by cyclic shifting, the sequence d _m is a sequence obtained after being multiplied by OCC, and an element w(m) is an m-th element of OCC. The selected OCC may be a Walsh code, a discrete fourier transform (DFT)-based orthogonal code, or the like according to different numbers of sequences forming the preamble. For example, a Walsh code having a length of 2 or 4 may be defined as in Equation 1 below.

Here, each row in the matrix represents one orthogonal sequence. That is, for a Walsh code of length 2, there are two selectable orthogonal codes. For a Walsh code of length 4, there are up to 4 selectable orthogonal codes.

For example, orthogonal codes having a length of 3 may be specifically designed based on DFT as shown in Equation 2 below.

Here, each row of the matrix represents one orthogonal sequence, and there are three usable orthogonal sequences.

The selectable orthogonal code sequences are known to the terminal by random access configuration information or configured to the terminal in a predefined manner, and the terminal selects them from the selectable orthogonal code sequences with the same probability. For a terminal operating in a connected state, when a contention-free random access process is requested to start, an orthogonal code sequence is configured by the base station.

A method of generating the preamble can be briefly described with reference to FIG. 10 .

In FIG. 10, the process of selecting sequences and parameters includes a process of selecting and generating a base sequence, and a process of selecting cyclic shift parameters and orthogonal sequences. The parameter w(m) is the mth element of the selected (constructed) orthogonal sequence. The process of generating the sequences includes generating time-domain sequences, adding a CP, and adding a GT to the end of the preamble.

, 첨자(subscript) u는 사용 가능한 ZC 시퀀스의 u번째 루트 시퀀스(root sequence)를 나타낸다.The length of the base sequences (i.e., each sequence in the preamble) is assumed to be N _pre , the base sequence selected from the resource pool by the terminal or configured by the base station is x _u , the nth element is x _u (n),

, the subscript u indicates the u-th root sequence of available ZC sequences.

As a cyclic shift representation method, for the m-th sequence, the sequence after the cyclic shift may be defined as in Equation 3 below.

This scheme is suitable for situations in which the preamble is generated in the time domain, for example, by using a waveform configuration of an SC-FDMA waveform or by defining and configuring cyclic shift parameters of a cyclic shift group in the time domain.

As another cyclic shift representation method, for the m-th sequence, the sequence after the cyclic shift may be defined as in Equation 4 below.

과 상기 C_m 간 관계는

이다. 상기 방식은 상기 프리앰블이 예를 들어, OFDM 웨이브폼의 웨이브폼 구성을 이용하거나 주파수 도메인에서 순환 시프트 그룹의 순환 시프트 파라미터들을 정의하고 구성하여 주파수 도메인에서 생성되는 상황에 적합하다.here,

And the relationship between the C _m

am. This method is suitable for a situation in which the preamble is generated in the frequency domain, for example, by using a waveform configuration of an OFDM waveform or by defining and configuring cyclic shift parameters of a cyclic shift group in the frequency domain.

The base station transmits parameters having definitions related to the cyclic shift group in the time domain or frequency domain, considering the one-to-one association of the definitions of the cyclic shift parameters in the frequency domain or time domain, and the terminal performs the cyclic shift according to the waveform used. Decide how to implement it.

). 상기 M은 직교 시퀀스의 길이, 즉, 상기 프리앰블에서 시퀀스들의 개수이다. 시간-도메인 스프레딩(spreading)(즉, OCC) m번째 시퀀스는 하기 <수학식 5>와 같이 정의될 수 있다.The orthogonal sequence is w, and the mth element of the orthogonal sequence is w(m) (

). The M is the length of an orthogonal sequence, that is, the number of sequences in the preamble. The time-domain spreading (ie, OCC) m-th sequence may be defined as in Equation 5 below.

The mth sequence is obtained from the sequence y _u,m by baseband signal generation (ie, time-domain signal generation).

As a special case of the above situation, multiple sequences forming the preamble may use the same cyclic shift. In this case, since different base sequences can be characterized by different cyclic shifts, there is no cyclic shifting step corresponding to the implementation shown in FIG. 10 .

Also, as an example of FIG. 10, multiple sequences forming the preamble may use different cyclic shifts and do not use orthogonal code spreading. Correspondingly, there is no step of multiplying the spreading factor w(i) after the cyclic shifting step in the implementation example shown in FIG. 10 .

In order to reduce inter-cell interference, the generation of cyclic shift may be related to cell ID. For example, a method of generating a cyclic shift group related to a cell ID may be defined as in Equation 6 below.

Here, C _m ⁱ is the cyclic shift corresponding to the m-th sequence of the i-th cyclic shift group, the parameter N- _cs is the cyclic shift difference between the two sequences, N _cs ^max is the maximum allowable cyclic shift, and C- _ini ⁱ is i Indicates the initial cyclic shift of the th cyclic shift group, and C- _ini ⁱ is related to the cell ID. As a possible method, a method of generating an initial cyclic shift of the Oth cyclic shift group can be defined as in Equation 7 below.

는 0과 N_CS ^groupM-1 간 랜덤 수(number)를 생성하는 의사 난수 함수(pseudorandom function)를 나타내고, 나머지 순환 시프트 그룹들은 C-_ini ⁰과 그룹 간(inter-group) 순환 시프트 간격 N_CS ^group에 따라 선형적으로 생성되고,

이다. 함수

를 생성하는 방법은 하기 <수학식 8>과 같이 정의될 수 있다.Here, n-- _ID ^cell is the cell ID, function

Represents a pseudorandom function that generates a random number between 0 and N _CS ^group M-1, and the remaining cyclic shift groups are C- _ini ⁰ and the inter-group cyclic shift interval N _CS It is generated linearly according to ^{the group} ,

am. function

A method of generating may be defined as in Equation 8 below.

는 예를 들어 M개의 시퀀스들 또는 Gold 시퀀스들에 기반하는 생성 방식을 사용하는 의사 난수 생성 함수를 나타내고, 함수

의 시작 값은 셀 ID에 의해 결정된다.where f ₁ and f ₂ are the starting and ending points of the summation term, the function

Represents a pseudo-random number generation function using a generation method based on, for example, M sequences or Gold sequences, and the function

The starting value of is determined by the cell ID.

In order to satisfy the condition that cyclic shifts of different cyclic shift groups do not collide with each other and that a cyclically shifted base sequence is not another base sequence, the relationship between cyclic shifts of base sequences and each cyclic shift in cyclic shift groups is shown in FIG. This is the relationship shown in 11.

An exemplary relationship shown in Fig. 11 indicates that after selecting a base sequence, the base sequence does not become another base sequence after undergoing a cyclic shift, and cyclic shifts in different groups do not interfere with each other.

In one embodiment, the preamble resource pool information includes basic sequence information, usable cyclic shift group information, and usable orthogonal sequence information. The preamble resource pool information is known to the terminal through random access configuration information in a broadcast channel by a master information block (MIB) or a system information block (SIB) indicated by the MIB. For a terminal requesting to apply a contention-based random access process, a base sequence, a cyclic shift group, and an orthogonal sequence are randomly selected from the preamble resource pool with equal probability, and the preamble is generated in the above-described manner. However, for a terminal requesting to apply a contention-free random access process, the information used to generate the preamble is directly configured by the base station. That is, the base station informs the configured base sequence, cyclic shift group information, and orthogonal sequence information.

The terminal generates a preamble in the above-described manner and transmits the preamble through a random access channel resource configured by the base station. For a UE that does not have beam reciprocity and needs to attempt multiple Tx beam directions, the above structure can perform transmission on random access channel resources using the same Tx beam. The base station configures a plurality of random access channel resources, and the terminal transmits a random access preamble using different random access channel resources using different Tx beams. As another example, different sequences use different Tx beams to perform transmission.

When detecting transmission of the preamble, the base station transmits a random access response within a corresponding random access response detection window. The random access response includes a temporary cell-radio network temporary identifier (TC-RNTI) allocated by the base station, timing advance information, and an identifier of the preamble. In one embodiment, the identifier of the preamble may include a base sequence identifier, a cyclic shift group index, and an orthogonal code index as shown in FIG. 12 .

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

The terminal determines whether the preamble identifier detected in the random access response corresponds to the transmitted preamble according to the preamble generation method used.

Second embodiment

In one embodiment, a method of generating a random access preamble will be described in conjunction with a specific system. A scheme of the first embodiment is that a plurality of sequences forming a preamble are generated from the same base sequence. However, in the second embodiment, a plurality of sequences forming the preamble are generated from different base sequences. In the second embodiment, it is assumed that the system operates in high band and obtains sufficient beamforming gain to compensate for path loss by multi-beam operation hybrid beamforming or simulated beamforming.

The preamble structure used in the second embodiment is shown in FIG. 13.

In the structure shown in FIG. 13, the preamble constitutes multiple sequences, CP is added before each sequence, and GT is added to the end of the preamble. All M_s sequences are generated from the same base sequence and are referred to as a sequence group. Specifically, in FIG. 13, the preamble constitutes M sequences. M is an even number. All two adjacent sequences are generated from the same base sequences. That is, in the example shown in FIG. 13, M_2 is 2.

,

). In practical applications, the value of M_s may be greater than 2 (

,

).

A method of generating sequences from the same base sequence is similar to that of the first embodiment. That is, each sequence is generated according to the selected or configured base sequence and the cyclic shift in the cyclic shift group, and each sequence forming the preamble is generated according to the selected or configured orthogonal code. A method of generating a preamble in the second embodiment is shown in FIG. 14 .

Referring to FIG. 14, S base sequences, cyclic shift groups, and orthogonal sequences are selected from the preamble resource pool according to the above configuration of the preamble resource pool, sequences forming the preamble are individually generated, and a plurality of sequences The preamble constituting . is generated as a result.

In the generation method, the preamble identifier constitutes S parts, and the structure of each part constitutes a base sequence identifier, a cyclic shift group index, and an orthogonal sequence index, as shown in FIG. 12 .

In another generation method, the UE selects one cyclic shift group and one orthogonal sequence with equal probability to generate M_s sequences according to the configuration information of the preamble resource pool. M_s sequences are repeated for S times and GT is added to the end of the sequences to be used as a preamble for the random access process.

As shown in FIG. 14, the difference between the method and the method is that different sequence groups in the method shown in FIG. 14 are generated from different base sequences, different cyclic shifts, and different orthogonal codes. . However, in the generation scheme, different sequence groups are generated from the same base sequence, the same cyclic shift, and the same orthogonal code. Compared to the generation method of FIG. 14, the generation method has an advantage in that the length of the preamble identifier can be considerably shortened.

In another compromised implementation, the terminal selects one base sequence, one or more cyclic groups, and one or more orthogonal sequences from the pool of available resources. The generation method is similar to that in FIG. 14 . In this way, the structure of the identifier of the preamble is shown in Fig. 15, and includes a base sequence identifier, cyclic shift index 1, orthogonal code index 1, cyclic shift index S, and orthogonal code index S.

The base station determines a preamble identifier according to the detected preamble and transmits the preamble identifier in a random access response. According to the preamble configured by the base station or a preamble randomly selected from the preamble resource pool with the same probability when transmitting the preamble, the terminal determines whether the determined preamble identifier matches an identifier in the detected random access response. .

Third embodiment

In the combination of the random access preamble structures provided in this disclosure, the third embodiment provides a mapping relationship between downlink broadcast channels and random access resources. In the third embodiment, the system applies multi-beam operation, that is, realizes wide coverage by multiple narrow beams. Meanwhile, the base station uses a plurality of synchronization signal blocks, and each synchronization signal block includes a primary synchronization signal, a secondary signal, and a broadcast channel. Each synchronization signal block corresponds to a different or identical base station-side Tx beam. In the Tx beam block, the broadcast channel informs the time-frequency resource information of the random access channel corresponding to the corresponding random access preamble resource pool information and the corresponding synchronization signal block (or broadcast channel) by the system information transmitted to the broadcast channel. .

In the third embodiment, broadcast channels of a plurality of sync signal blocks indicate the same random access channel time-frequency resource, and different sync signal blocks use different or identical downlink Tx beams. 16 is a schematic diagram of an indication relationship between a downlink broadcast channel and a random access channel resource in a third embodiment.

In FIG. 16, the base station uses N downlink synchronization signal blocks (represented by SS block 1 to SS block N) during downlink synchronization. Each synchronization signal block uses one downlink Tx beam to perform transmission. In the example of FIG. 16, different sync signal blocks use different downlink Tx beams. In practical applications, different sync signal blocks may use the same downlink Tx beam. One or more random access channel time-frequency resources are allocated in an uplink channel, and the random access channel time-frequency resources indicated by a plurality of synchronization signal blocks are the same. In the example of FIG. 16, the random access channel time-frequency resources indicated by the two synchronization signal blocks are the same. For example, both SS block 1 and SS block 2 indicate RACH 1. Time-frequency resources for the random access channel are configured by random access channel configuration in system information. Also, different random access channel time-frequency resources may correspond to different numbers of synchronization signal blocks.

In the system information, the random access channel configuration constitutes random access preamble resource pool information. Random access preamble resource pools for different random access channel time-frequency resources may configure the same random access preamble. Since it is necessary to distinguish different synchronization signal blocks (in order to clearly indicate different downlink Tx beams), different synchronization signal blocks for indicating the same random access channel time-frequency resource represent random access preamble resource pools. When indicated, random access preamble resources that do not overlap with each other to determine time-frequency resources for transmitting synchronization signal block information and preambles of the base station and downlink Tx beams for transmitting random access responses. It is essential to direct the pools.

In the indication method, to indicate the range of preamble indices in the preamble resource pool, when indicating the preamble resource pool, the number of preambles in the preamble resource pool and the start index of the preamble indices are indicated by the preamble indices, or the preamble start Index and preamble end index are indicated.

When the preamble generation scheme provided by the present disclosure is applied, a complete random access preamble is composed of a plurality of different preambles, which are formed from one or more base sequences by cyclic shift and orthogonal cover code processing. can be obtained A method of allocating a preamble resource pool is as follows.

The preamble resource pool consists of two parts: preambles (or a combination of base sequences and cyclic shift groups) and orthogonal cover codes. A preamble resource pool indicated by one random access channel configuration includes codewords of one orthogonal cover code. The preamble format may be shown as shown in FIG. 17.

In FIG. 17, the length of the used orthogonal code cover is 2, which can be expressed as w=[w1 w2]. Both w1 and w2 are real numbers. The random access preamble consists of multiple sequences, and each element of two adjacent sequences is multiplied by w1 and w2, respectively. In a broad sense, the length of an orthogonal cover code is n- _occ , and multiplication may be performed before or after IDFT (or IFFT). Each of the generated sequences is added with a CP and cascaded to form a random access preamble.

Multiple sequences forming the same random access preamble may be different sequences in the preamble resource pool, or may be generated from one sequence in the preamble resource pool by multiple cyclic shifts. In the former case, the random access preamble pool is composed of a plurality of preambles and one orthogonal cover code codeword, and the terminal selects a plurality of preambles to form a random access preamble. However, in the latter case, the random access preamble resource pool is composed of one or more base sequences, a plurality of cyclic shift groups, and one orthogonal cover code codeword, and the terminal uses the base sequence and cyclic shift to form a random access preamble. Select a shift group.

The consecutive sequences n _occ processed by the same orthogonal cover code are a plurality of sequences randomly selected from the random access preamble resource pool, or a plurality of sequences formed by performing cyclic shifting from the random access preamble resource pool to one base sequence. sequences, or a plurality of sequences generated by repeating one sequence in a random access preamble resource pool or the like.

An orthogonal cover code may be an orthogonal sequence, eg, a Walsh code, a DFT codeword, or the like. When an orthogonal codeword is used, the index of the corresponding codeword is predefined by a lookup table, and the index of the orthogonal codeword is known when configuring random access channel configuration information. <Table 1> shows an example index of a Walsh codebook with length 2, <Table 2> shows an example index of a DFI codebook with length 3, and <Table 3> shows an example index of a Walsh codebook with length 4 .

index code word 0 [+1 +1] One [+1 -1]

index code word 0 [1 1 1] One

][One

] 2 [One

]

index code word 0 [+1 +1 +1 +1] One [+1 +1 -1 -1] 2 [+1 -1 -1 +1] 3 [+1 -1 +1 -1]

Codewords in the codebooks are examples only, and other orthogonal codebooks may be used as orthogonal cover codes. In addition to examples, the cover code may be a quasi-orthogonal codeword. In the example, an M-sequence, a Gold sequence, or another polynomial based pseudorandom sequence is used, a generator polynomial is predefined to generate the pseudorandom sequence, and the initial sequence of the M-sequence is The status is related to the index of the used sync signal block. For example, the generated sequence may be w(i)=c(i+N _c ). Here, N _c indicates a start position of truncation of the pseudo random sequence and is configured by higher layer signaling. Function c(n) is a function for generating a pseudo-random sequence, which can be an M-sequence or a Gold sequence. The initial state of the M-sequence is c _init =f(N _ss ). Here, N _ss is the index of the selected synchronization signal block, and f(N _ss ) is a function related to N _ss . The cover code generated in the above method can be expressed as w=[w(1), ..., w(N _occ )]. The plurality of preambles selected by the terminal are a plurality of preambles generated from one or more base sequences selected by the terminal by cyclic shift. Here, after the preambles are switched to the time domain, each element of the i-th sequence is multiplied by w(i), a CP is added, and cascaded to form a random access preamble.

When an orthogonal cover code is used in the solutions provided in this disclosure, a terminal may behave as follows.

Step 1: Downlink synchronization is performed to obtain random access channel configuration information. Specifically, the optimal synchronization signal block is determined according to the received power of the primary synchronization signal and the received power of the secondary synchronization signal in the received and detected synchronization signal blocks, transmitted by a broadcast channel in the synchronization signal block. The random access channel configuration information of the system information and the index of the synchronization signal block are read.

Step 2: A random access preamble is generated according to the random access channel configuration information and transmitted on the configured or selected random access channel resource. Here, the random access channel configuration information includes preamble resource pool information and corresponding cover code codewords.

When the terminal uses the sequence-based cover code, the terminal operates as follows.

Step 1: Downlink synchronization is performed. The optimal synchronization signal block is determined according to the power of the primary synchronization signal and the secondary synchronization signal in the received and detected synchronization signal blocks. An optimal synchronization signal block means a synchronization signal block having maximum detected power.

Step 2: According to at least one of the system blocks transmitted as the primary synchronization signal, the reference signal information inserted into the synchronization channel block, the index of the synchronization signal block, or the index of the corresponding downlink Tx beam is transmitted as the primary synchronization signal The received system information, the system information transmitted through the secondary synchronization signal, and the system information transmitted through the broadcasting channel are determined.

Step 3: A cover code corresponding to a sync channel block is generated according to the determined index and a predefined cover code generation method, the generated preamble is processed to generate a final preamble, and the final preamble is configured or transmitted through the selected random access channel resource.

When the solutions provided in this disclosure are used, the base station may operate as follows.

Step 1: The base station constructs and transmits a downlink synchronization signal.

Step 2: The base station receives and detects the random access preamble.

Step 3: The base station determines a downlink Tx beam for transmitting a random access response according to random access channel time-frequency resource information and preamble information.

When the terminal uses the sequence-based cover code, the base station may operate as follows.

Step 1: The base station constructs and transmits a downlink synchronization signal.

Step 2: The base station receives and detects the random access preamble.

Step 3: The base station determines a downlink Tx beam for transmitting a random access response according to random access channel time-frequency resource information and preamble information (preamble cover code information).

In the meantime, a method for distinguishing preambles may be used to distinguish between a UE having beam reciprocity and a UE not having beam reciprocity. Specifically, a terminal having beam reciprocity and a terminal not having beam reciprocity multiplex the same random access channel time-frequency resources. The preamble resource pool contains two parts: preambles (or a combination of base sequences and cyclic shift groups) and cover codes. Preambles (combination of base sequences and cyclic shift groups) in preamble resource pools used by a terminal with beam reciprocity and a terminal without beam reciprocity are partially the same, but the two preamble resource pools have different cover codes, For example, cover codes generated from different orthogonal cover codewords and different sequences are used.

As the system information is read, the terminal selects one preamble from all available preambles (or a combination of base sequences and cyclic shift groups) with equal probability or a preamble assigned to the base station (or base sequence or cyclic shift group combination). combination), selects a corresponding cover code according to the beam reciprocity capability of the terminal to generate the last random access preamble, and transmits the last random access preamble through the corresponding random access channel time-frequency resource.

Fourth embodiment

In the fourth embodiment, a communication procedure between a terminal and a base station employing the method of generating a preamble provided in the present disclosure is introduced.

In the fourth embodiment, sync signal blocks are composed of a first sync signal, a second sync signal, and a broadcast channel. To apply to multi-beam operation in a high frequency band, different synchronization signal blocks are transmitted using the same or different downlink transmission beams of the base station, while different symbols from the same synchronization signal blocks are transmitted on the same downlink of the base station. transmitted by a transmit beam. The master information block is transmitted through a broadcast channel among synchronization signal blocks. Here, the master information block includes essential information for accessing the network including the system frame number, the position of the synchronization signal block in the radio frame such as the time index of the system block, and the time-frequency resource configuration for the control information of the RMSI. It includes scheduling information of remaining minimum system information (RMSI), system band information, and the like.

Random access configuration information is included in the RMSI. Here, random access channel configuration information, preamble resource pool information, and the like are included in random access allocation information. Regarding the multi-beam operating system, the base station performs downlink transmission for transmitting a random access response by the base station according to a relationship between preamble groups as well as time-frequency resources for a random access channel and a corresponding downlink signal or synchronization signal block. It is necessary to determine the beam. When multiple synchronization signal blocks are mapped to the same time-frequency resource for a random access channel, grouping the preamble is required for identification of the UE about the downlink signal or synchronization signal block to determine the downlink transmission beam. do.

When the content for RMSI transmission is the same for different directions of downlink transmission beams, the RMSI needs to inform the UE of all random access configuration information related to all synchronization signal blocks.

A method for indicating a preamble resource pool for random access is described in the fourth embodiment. In the fourth embodiment, the random access configuration information includes random access channel configuration information related to the synchronization signal block and preamble resource pool information for random access related to the synchronization signal block. Since the cover code is used to distinguish a preamble sequence resource for random access related to another downlink signal, the following method for indication can be used. (a) The preamble resource pool is grouped into a sequence resource pool and a cover code resource. Random access configurations related to different downlink signals use the same sequence resource pool, and random access configurations related to different transmission beams use different cover codes. (b) The preamble resource pool is grouped into a sequence resource pool and a cover code resource. Random access configurations related to different downlink signaling use different sequence resource pools, and random access configurations related to different transmission beams use different cover codes. (c) a combination of the above two schemes, for example, random access configurations associated with different downlink signals use the same or different sequence resource pools, and the same sequence resource pool is used, but random access configurations associated with different downlink transmission beams Access schemes use different cover codes.

Regarding the method of indicating the cover code resource, possible indication methods are as follows.

1. The available orthogonal cover code sets are indicated. Cover codes used for synchronization signal blocks are determined according to a predefined relationship or a relationship indicated in the RMSI. One possible way is to determine the corresponding cover code according to the index of the synchronization signal block. In one example, an orthogonal cover code having a length M is used, and an index of a cover code related to a sync signal block having an index of n _ss may be defined as in Equation 9 below.

Here, mod() is a modular operation.

In another example, an orthogonal cover code having a length M is used, and an index of a cover code related to a sync signal block having an index of n _ss may be defined as in Equation 10 below.

The first scheme corresponds to a situation in which different orthogonal cover codes are used for synchronization signal blocks having adjacent indices, that is, under the assumption that multiple adjacent synchronization signal blocks can be mapped to the same time-frequency resource for random access. For example, M=2, the number of sync signal blocks is 16, and the indices of orthogonal cover codes related to other sync signal blocks may be [0 1 0 1 0 1 0 1 0 1 0 1 0 1 0 1]. .

The second scheme corresponds to a situation in which the same orthogonal cover code is used for synchronization signal blocks having adjacent indices. For example, if M=2 and the number of sync signal blocks is 16, the indices of orthogonal cover codes related to other sync signal blocks are expressed as [0 0 1 1 0 0 1 1 0 0 1 1 0 0 1 1] It can be.

In the above scheme, the usable cover code and the corresponding index are required to be indicated. When the corresponding rules and predefined manners are determined, no additional information needs to be indicated. Also, corresponding rules are indicated through RMSI.

2. The set of usable cover codes is indicated and the index of the orthogonal cover code associated with each synchronization is indicated in the RMSI. Indexes of cover codes associated with each of the sync signal blocks are aligned according to the indexes of the sync signal blocks in the RMSI, and a sequence composed of the indices is indicated in the RMSI. In an example where M=2 and the number of sync signal blocks is 16, the sequence consisting of indices known in the RMSI may be [0 0 1 0 1 0 1 1 0 1 0 1 0 0 0 1].

In the above example, different orthogonal cover codes, different parts of sync signal blocks associated with the same time-frequency resource for random access, are required to distinguish different preambles, e.g., sync signal blocks 1 and 2. Another part of the sync signal blocks associated with the corresponding time-frequency resource for the random access channel is in a one-to-one manner.

When there are a large number of available orthogonal cover codes, the overhead required for this scheme is high, but more flexible associations can be supported.

3. Both of the above methods are suitable for situations in which RMSI transmitted through different beams is the same. Regarding a situation in which RMSIs transmitted through different beams are different, RMSIs transmitted by different base station downlink beams may carry indexes for related cover codes in addition to using scheme 1.

4. Regarding the random access configuration associated with different downlink beams, if the sequence resource pool is different, a possible configuration method is the number of sequences in the sequence resource pool in the random access configuration associated with each of the synchronization signal blocks as well as the corresponding cover code The indexes are listed in the RMSI according to the order of indexes for synchronization signal blocks. In addition, when the information is transmitted by RMSI transmitted through different base station downlink transmission beams, the RMSI transmitted by each downlink transmission beam is the index of the cover code and the number of sequences in the sequence resource pool related to the beam need to pass

In some embodiments, different sync signal blocks are associated with different time-frequency resources for random access. In this case, the base station receives corresponding downlink transmission beam information through time-frequency resources for a random access channel without a plurality of cover codes for distinguishing downlink transmission beams. One possible way is that indication information for activating the cover code is added among the random access configuration information. For example, the variable OCC_flag is added to random access configuration information. If the indication information is 1, it is indicated that a method of generating a preamble using a cover code is activated, and a preamble resource is indicated in the above-described method. If the indication information is 0, it is indicated that a method of generating a preamble using a cover code is deactivated. In this case, a method of generating a preamble based on the cover code is not used, or the cover code is a sequence full of 1's. Another possible way is that the synchronization signal blocks are associated with time-frequency resources for a random access channel in a one-to-one manner, the number of usable cover codes consists of 1, and the cover code is a sequence full of 1's. The configuration provided in is used. As for the indication information for activating the cover code, if the method of generating a preamble using the cover code is not used, there is an indication related to the cover code such as an index for the cover code, but the terminal can ignore the related indication, That is, it may be 0 indicating that the indication related to the cover code is invalid. The preamble may be generated in a method of generating a preamble without a cover code.

Another configuration method regarding whether to select a preamble in formation of a cover code is to set various preamble formats. Here, some preamble sequence formats do not use the above method of generating a preamble using a cover code, or consider that the length of the cover code is basically 1, or that the cover code is a sequence full of 1's. Other preamble formats may use the above method of generating a preamble using a cover code.

A method of determining a preamble pool resource for random access by a terminal is as follows.

The terminal detects a downlink synchronization signal. The terminal detects synchronization signal blocks whose one or more measurement results are greater than a predefined threshold through blind detection. Here, the measurement result includes the received power of a reference signal such as a primary synchronization signal.

The terminal selects a synchronization signal block according to a predetermined mood and reads master system information from a broadcast channel. The criterion is that the synchronization signal having the highest measurement result is selected or among the synchronization signals having a measurement result higher than a predetermined threshold value with equal probability. The terminal reads the master system information from the sync signal blocks and acquires indexes of the sync signal blocks.

The terminal reads the random access configuration information from the RMSI according to the master system information. The random access configuration information includes time-frequency information for a random access channel, preamble format information, and preamble resource pool information. The terminal reads index information and sequence pool information of a cover code related to a synchronization signal block, and acquires preamble resource pool information. If the indication of cover code activation is used, the terminal is required to read the indication of cover code activation. When the indication of activation of the cover code is 1, that is, when the indication of the cover code is activated, sequence resource pool information and indication related to the cover code are read, and a method of generating a preamble using the cover code is used. When the indication of cover code activation is 1, that is, when the indication related to the cover code is deactivated, the sequence resource pool information is read, but the indication related to the cover code is not read.

The terminal generates a preamble according to the indication in the random access configuration information, and transmits the preamble through time-frequency resources for the random access channel.

A method of detecting and receiving the random access preamble by the base station is similar to that of the third embodiment and can be described as follows.

The base station detects information on time-frequency resources for a random access channel, and when transmission of a preamble is detected, determines a downlink transmission beam according to cover code indication information and time-frequency resources.

The base station determines the index of the optimal synchronization signal block detected by the terminal according to the relationship between the index of the cover code and the downlink signal and the time-frequency resource, and based on it, the optimal downlink transmission for transmitting the random access response. determine the beam.

In addition, the method provided in the present disclosure is suitable for a situation where a base station has beam reciprocity capability and a situation where it does not. The above application is performed by repeatedly configuring the preamble format, and the configuration method provided in the present disclosure is not affected.

Corresponding to the above method, the present disclosure provides an apparatus for generating a random access preamble. 18 shows a configuration structure of a device including a configuration module, a sequence generation module, and a preamble generation module.

The configuration module is configured to receive random access configuration information. Random access configuration information includes preamble resource pool information. The preamble resource pool information includes available base sequences.

The sequence generation module is configured to generate M sequences according to the base sequence. M is greater than 1.

The preamble generation module is configured to generate a random access preamble according to the M sequences.

The preamble generation module is configured to generate a random access preamble according to the M sequences.

Corresponding to the method for generating the random access preamble, the present disclosure further provides a method for providing random access configuration information applied to the base station side.

The method includes the steps of transmitting random access configuration information to a terminal, the random access configuration information including preamble resource pool information, and the preamble resource pool information includes usable base sequences, cyclic shift groups, and orthogonal codes. include,

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

Corresponding to the above method, the present disclosure further provides an apparatus for indicating random access configuration information. Fig. 19 shows the configuration structure of the device including a transmitting module and a receiving module.

The transmitting module is configured to transmit random access configuration information to a terminal, the random access configuration information including preamble resource pool information, wherein the preamble resource pool information includes available base sequences, cyclic shift groups, and an orthogonal code. include them

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

Methods according to the embodiments described in the claims or specification of the present disclosure may be implemented in the form of hardware, software, or a combination of hardware and software.

When implemented in software, a computer readable storage medium storing one or more programs (software modules) may be provided. One or more programs stored in a computer-readable storage medium are configured for execution by one or more processors in an electronic device. The one or more programs include instructions that cause the electronic device to execute methods according to embodiments described in the claims or specification of the present disclosure.

Such programs (software modules, software) may include random access memory, non-volatile memory including flash memory, read only memory (ROM), and electrically erasable programmable ROM. (electrically erasable programmable read only memory (EEPROM), magnetic disc storage device, compact disc-ROM (CD-ROM), digital versatile discs (DVDs), or other It can be stored on optical storage devices, magnetic cassettes. Alternatively, it may be stored in a memory composed of a combination of some or all of these. In addition, each configuration memory may be included in multiple numbers.

In addition, the program is provided through a communication network such as the Internet, an intranet, a local area network (LAN), a wide area network (WAN), or a storage area network (SAN), or a communication network consisting of a combination thereof. It can be stored on an attachable storage device that can be accessed. Such a storage device may be connected to a device performing an embodiment of the present disclosure through an external port. In addition, a separate storage device on a communication network may be connected to a device performing an embodiment of the present disclosure.

In the specific embodiments of the present disclosure described above, components included in the disclosure are expressed in singular or plural numbers according to the specific embodiments presented. However, the singular or plural expressions are selected appropriately for the presented situation for convenience of explanation, and the present disclosure is not limited to singular or plural components, and even components expressed in plural are composed of the singular number or singular. Even the expressed components may be composed of a plurality.

Meanwhile, in the detailed description of the present disclosure, specific embodiments have been described, but various modifications are possible without departing from the scope of the present disclosure. Therefore, the scope of the present disclosure should not be limited to the described embodiments and should not be defined by the scope of the claims described below as well as those equivalent to the scope of these claims.

Claims (46)

In a method of operating a terminal in a wireless communication system,
Receiving configuration information for a random access channel (RACH) including a plurality of base sequences from a base station;
Transmitting a RACH preamble to the base station based on the configuration information;
The RACH preamble is generated based on a plurality of sequences, a plurality of cyclic prefixes (CPs), and a guard time (GT);
The plurality of sequences are generated based on at least one of the plurality of base sequences,
Each of the plurality of sequences is connected to a corresponding CP among the plurality of CPs,
The GT is concatenated with the last sequence of the plurality of sequences.
delete delete delete The method of claim 1,
Obtaining a plurality of intermediate sequences by performing a cyclic shift corresponding to one base sequence among the plurality of base sequences according to each cyclic shift parameter in one cyclic shift group among a plurality of cyclic shift groups. process and
obtaining the plurality of sequences by processing the plurality of intermediate sequences using one orthogonal code among a plurality of orthogonal codes;
The configuration information further includes the plurality of cyclic shift groups and the plurality of orthogonal codes,
The configuration information includes a base sequence identifier, a cyclic shift group index, and an orthogonal code index.
The method of claim 5,
obtaining the plurality of sequences by processing one base sequence among the plurality of base sequences using one orthogonal code among the plurality of orthogonal codes;
The configuration information further includes the plurality of orthogonal codes,
The random access preamble identifier includes a base sequence identifier and an orthogonal code index.
delete The method of claim 5,
and multiplying at least one of the plurality of base sequences by an element of the one orthogonal code.
delete The method of claim 5,
The cyclic shift parameter of the cyclic shift group is related to cell identification (ID),
The cyclic shift group is determined based on at least one of a cyclic shift difference between two sequences, an allowable maximum cyclic shift, an initial cyclic shift, and the cell ID.
In a terminal device in a wireless communication system,
with transceiver
including at least one processor functionally coupled to the transceiver;
The at least one processor,
Receive configuration information for a random access channel (RACH) including a plurality of base sequences from a base station;
Control the base station to transmit a RACH preamble based on the configuration information;
The RACH preamble is generated based on a plurality of sequences, a plurality of cyclic prefixes (CPs), and a guard time (GT);
The plurality of sequences are generated based on at least one of the plurality of base sequences,
Each of the plurality of sequences is connected to a corresponding CP among the plurality of CPs,
The GT is connected to the last sequence of the plurality of sequences.
delete delete delete The method of claim 11,
The at least one processor,
Obtaining a plurality of intermediate sequences by performing a cyclic shift corresponding to one base sequence among the plurality of base sequences according to each cyclic shift parameter in one cyclic shift group among the plurality of cyclic shift groups; ,
Control to obtain the plurality of sequences by processing the plurality of intermediate sequences using one orthogonal code among a plurality of orthogonal codes;
The configuration information further includes the plurality of cyclic shift groups and the plurality of orthogonal codes,
The configuration information includes a base sequence identifier, a cyclic shift group index, and an orthogonal code index.
The method of claim 15
The at least one processor controls to obtain the plurality of sequences by processing one base sequence from among the plurality of base sequences using one orthogonal code from among the plurality of orthogonal codes;
The configuration information further includes the plurality of orthogonal codes,
The random access preamble identifier includes a base sequence identifier and an orthogonal code index.
delete The method of claim 15
wherein the at least one processor controls to multiply at least one of the plurality of basic sequences by an element of the one orthogonal code.
delete The method of claim 15
The cyclic shift parameter of the cyclic shift group is related to cell identification (ID),
The cyclic shift group is determined based on at least one of a cyclic shift difference between two sequences, an allowable maximum cyclic shift, an initial cyclic shift, and the cell ID.
In the method of operating a base station in a wireless communication system,
Transmitting configuration information for a random access channel (RACH) including a plurality of base sequences to a terminal;
Receiving a RACH preamble from the terminal based on the configuration information;
The RACH preamble is generated based on a plurality of sequences, a plurality of cyclic prefixes (CPs), and a guard time (GT);
The plurality of sequences are generated based on at least one of the plurality of base sequences,
Each of the plurality of sequences is connected to a corresponding CP among the plurality of CPs,
The GT is concatenated with the last sequence of the plurality of sequences.
The method of claim 21,
The configuration information further includes cyclic shift groups,
Parameters in the cyclic shift groups are different from each other in a first condition that, after performing a cyclic shift on each base sequence using each cyclic shift group, no other base sequence among the plurality of base sequences is obtained. A method that satisfies the second condition that cyclic shifts between shift groups do not interfere with each other.
In a base station device in a wireless communication system,
transceiver and
including at least one processor functionally coupled to the transceiver;
The at least one processor,
Transmitting configuration information for a random access channel (RACH) including a plurality of base sequences to the terminal;
Controlled to receive a RACH preamble based on the configuration information from the terminal;
The RACH preamble is generated based on a plurality of sequences, a plurality of cyclic prefixes (CPs), and a guard time (GT);
The plurality of sequences are generated based on at least one of the plurality of base sequences,
Each of the plurality of sequences is connected to a corresponding CP among the plurality of CPs,
The GT is connected to the last sequence of the plurality of sequences.
The method of claim 23
The configuration information further includes cyclic shift groups,
Parameters in the cyclic shift groups are different from each other in a first condition that, after performing a cyclic shift on each base sequence using each cyclic shift group, no other base sequence among the plurality of base sequences is obtained. An apparatus that satisfies the second condition that cyclic shifts between shift groups do not interfere with each other.
delete delete delete delete delete delete delete delete delete delete The method of claim 1,
Receiving a plurality of synchronization signal blocks (SSBs) related to a plurality of downlink beams from the base station;
The RACH preamble is transmitted through a time-frequency resource indicating a downlink beam between the plurality of downlink beams,
SSBs corresponding to the time-frequency resource are associated with different orthogonal codes.
The method of claim 1,
The RACH preamble includes a first sequence and a second sequence,
The first sequence generated based on one of the plurality of base sequences is connected to a first CP,
The second sequence generated based on one of the plurality of base sequences is connected to a second CP.
The method of claim 11,
The at least one processor,
Control to receive a plurality of synchronization signal blocks (SSBs) related to a plurality of downlink beams from the base station;
The RACH preamble is transmitted through a time-frequency resource indicating a downlink beam between the plurality of downlink beams,
SSBs corresponding to the time-frequency resource are associated with different orthogonal codes.
The method of claim 11,
The RACH preamble includes a first sequence and a second sequence,
The first sequence generated based on one of the plurality of base sequences is connected to a first CP,
The second sequence generated based on one of the plurality of base sequences is connected to a second CP.
The method of claim 21,
Transmitting a plurality of synchronization signal blocks (SSBs) related to a plurality of downlink beams to the terminal,
The RACH preamble is transmitted through a time-frequency resource indicating a downlink beam between the plurality of downlink beams,
SSBs corresponding to the time-frequency resource are associated with different orthogonal codes.
The method of claim 21,
The RACH preamble includes a first sequence and a second sequence,
The first sequence generated based on one of the plurality of base sequences is connected to a first CP,
The second sequence generated based on one of the plurality of base sequences is connected to a second CP.
The method of claim 21,
The method of claim 1, wherein the configuration information further includes cyclic shift groups.
The method of claim 21,
The method of claim 1 , wherein the configuration information further includes cyclic shift groups and orthogonal codes.
The method of claim 23
The at least one processor,
Control to transmit a plurality of synchronization signal blocks (SSBs) related to a plurality of downlink beams to the terminal;
The RACH preamble is transmitted through a time-frequency resource indicating a downlink beam between the plurality of downlink beams,
SSBs corresponding to the time-frequency resource are associated with different orthogonal codes.
The method of claim 23
The RACH preamble includes a first sequence and a second sequence,
The first sequence generated based on one of the plurality of base sequences is connected to a first CP,
The second sequence generated based on one of the plurality of base sequences is connected to a second CP.
The method of claim 23
The configuration information further comprises cyclic shift groups.
The method of claim 23
The configuration information further includes cyclic shift groups and orthogonal codes.

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