WO2017176033A1 - Procédé et appareil pour décoder un message de réponse d'accès aléatoire dans un système de communication sans fil - Google Patents

Procédé et appareil pour décoder un message de réponse d'accès aléatoire dans un système de communication sans fil Download PDF

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Publication number
WO2017176033A1
WO2017176033A1 PCT/KR2017/003696 KR2017003696W WO2017176033A1 WO 2017176033 A1 WO2017176033 A1 WO 2017176033A1 KR 2017003696 W KR2017003696 W KR 2017003696W WO 2017176033 A1 WO2017176033 A1 WO 2017176033A1
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WIPO (PCT)
Prior art keywords
random access
resource
response message
rach
preamble
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PCT/KR2017/003696
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English (en)
Korean (ko)
Inventor
유현일
김태영
노지환
Original Assignee
삼성전자 주식회사
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
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Priority claimed from KR1020170015793A external-priority patent/KR20170114916A/ko
Application filed by 삼성전자 주식회사 filed Critical 삼성전자 주식회사
Priority to US16/090,523 priority Critical patent/US10701684B2/en
Priority to EP17779333.8A priority patent/EP3432673B1/fr
Publication of WO2017176033A1 publication Critical patent/WO2017176033A1/fr
Priority to US16/915,138 priority patent/US11395289B2/en

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    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04B—TRANSMISSION
    • H04B7/00—Radio transmission systems, i.e. using radiation field
    • H04B7/02—Diversity systems; Multi-antenna system, i.e. transmission or reception using multiple antennas
    • H04B7/04—Diversity systems; Multi-antenna system, i.e. transmission or reception using multiple antennas using two or more spaced independent antennas
    • H04B7/06—Diversity systems; Multi-antenna system, i.e. transmission or reception using multiple antennas using two or more spaced independent antennas at the transmitting station
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04W—WIRELESS COMMUNICATION NETWORKS
    • H04W74/00—Wireless channel access
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04W—WIRELESS COMMUNICATION NETWORKS
    • H04W74/00—Wireless channel access
    • H04W74/08—Non-scheduled access, e.g. ALOHA

Definitions

  • the present invention relates to a method for decoding a random access response message in a wireless communication system, and more particularly, to a method for decoding a random access response message using a relationship between a random access preamble message and a random access response message during a random access procedure.
  • a 5G communication system or a pre-5G communication system is called a system after a 4G network (Beyond 4G Network) or a system after an LTE system (Post LTE).
  • 5G communication systems are being considered for implementation in the ultra-high frequency (mmWave) band (eg, such as the 60 Gigabit (60 GHz) band).
  • FD-MIMO massive array multiple input / output
  • FD-MIMO massive array multiple input / output
  • FD-MIMO massive array multiple input / output
  • FD-MIMO massive array multiple input / output
  • FD-MIMO massive array multiple input / output
  • Array antenna, analog beam-forming, and large scale antenna techniques are discussed.
  • 5G communication systems have advanced small cells, advanced small cells, cloud radio access network (cloud RAN), ultra-dense network (ultra-dense network) , Device to Device communication (D2D), wireless backhaul, moving network, cooperative communication, Coordinated Multi-Points (CoMP), and interference cancellation
  • cloud RAN cloud radio access network
  • D2D Device to Device communication
  • D2D Device to Device communication
  • CoMP Coordinated Multi-Points
  • Hybrid FSK and QAM Modulation FQAM
  • SWSC Slide Window Superposition Coding
  • ACM Advanced Coding Modulation
  • FBMC Fan Bank Multi Carrier
  • NOMA non orthogonal multiple access
  • SCMA sparse code multiple access
  • IoT Internet of Things
  • IoE Internet of Everything
  • M2M machine to machine
  • MTC Machine Type Communication
  • IT intelligent Internet technology services can be provided that collect and analyze data generated from connected objects to create new value in human life.
  • IoT is a field of smart home, smart building, smart city, smart car or connected car, smart grid, health care, smart home appliances, advanced medical services, etc. through convergence and complex of existing information technology (IT) technology and various industries. It can be applied to.
  • the base station when different terminals transmit the same random access preamble, the base station cannot distinguish different terminals. Accordingly, the base station transmits one random access response, and the terminal receives the same random access response.
  • the random access response may include uplink resource allocation information, and the terminal may transmit a radio resource control (RRC) connection request message through the same uplink resource.
  • RRC radio resource control
  • the present invention has been proposed to solve the above-described problem, and the present invention establishes a relationship between a random access preamble and a random access response message in a random access procedure so that even when the UE transmits the same random access preamble, the UEs are different from each other. It is an object of the present invention to provide a method for transmitting another random access response.
  • Method of the terminal of the present invention for solving the above problems, the step of transmitting a random access preamble through a resource associated with the resource receiving the downlink synchronization signal, receiving a random access response message for the random access preamble And decoding the random access response message using information determined based on the resource receiving the downlink synchronization signal.
  • the method of the base station in a wireless communication system comprising the steps of: receiving a random access preamble through a resource associated with the resource transmitting the downlink synchronization signal, the downlink And transmitting a random access response message based on the resource transmitting the synchronization signal, wherein the random access response message is decoded using information determined based on the resource receiving the downlink synchronization signal.
  • the terminal of the present invention for solving the above problems, the transmission and reception unit for transmitting and receiving a signal; And transmitting a random access preamble through a resource associated with the resource receiving the downlink synchronization signal, receiving a random access response message for the random access preamble, and receiving information determined based on the resource receiving the downlink synchronization signal. And a controller configured to decode the random access response message.
  • the base station of the present invention for solving the above problems receives a random access preamble through a transceiver for transmitting and receiving a signal, and resources associated with the resource for transmitting the downlink synchronization signal, and transmits the downlink synchronization signal And a controller for transmitting a random access response message based on one resource, wherein the random access response message is decoded using information determined based on a resource receiving the downlink synchronization signal.
  • each terminal may receive different random access response messages.
  • 1 is a diagram illustrating a random access procedure in LTE.
  • FIG. 2 is a diagram illustrating a random access procedure in a beamforming based system according to the present invention.
  • 3A illustrates a method for transmitting a first message according to beam reciprocity in a beamforming based system according to the present invention.
  • FIG. 3B is a diagram illustrating the first message transmission process shown in FIG. 2 in detail.
  • FIG. 5 illustrates an embodiment in which only one FFT is used when the RACH and the data channel are multiplexed.
  • FIG. 6 illustrates a case in which FFTs having different sizes are used while using preamble format 2-1.
  • FIG. 7 is a diagram illustrating an embodiment of setting an RACH transmission time interval during a predetermined period according to the present invention.
  • RA procedure random access procedure
  • FIG. 9 is a diagram illustrating a method in which a RACH resource includes Tx beam information.
  • 10A and 10B illustrate a method of setting a time between MSG2 and MSG1.
  • FIG. 11 is a diagram illustrating a relationship between MSG1 and MSG2 according to a preamble ID according to an embodiment of the present invention.
  • FIG. 12 illustrates a relationship between MSG1 and MSG2 according to RA-RNTI according to an embodiment of the present invention.
  • FIG. 13 is a diagram illustrating an operation sequence of a terminal according to an embodiment of the present invention.
  • FIG. 14 is a diagram illustrating an operation sequence of a base station according to an embodiment of the present invention.
  • 15 is a diagram showing the structure of a terminal according to an embodiment of the present invention.
  • 16 is a diagram illustrating a structure of a base station according to an embodiment of the present invention.
  • each block of the flowchart illustrations and combinations of flowchart illustrations may be performed by computer program instructions. Since these computer program instructions may be mounted on a processor of a general purpose computer, special purpose computer, or other programmable data processing equipment, those instructions executed through the processor of the computer or other programmable data processing equipment may be described in flow chart block (s). It creates a means to perform the functions. These computer program instructions may be stored in a computer usable or computer readable memory that can be directed to a computer or other programmable data processing equipment to implement functionality in a particular manner, and thus the computer usable or computer readable memory. It is also possible for the instructions stored in to produce an article of manufacture containing instruction means for performing the functions described in the flowchart block (s).
  • Computer program instructions may also be mounted on a computer or other programmable data processing equipment, such that a series of operating steps may be performed on the computer or other programmable data processing equipment to create a computer-implemented process to create a computer or other programmable data. Instructions for performing the processing equipment may also provide steps for performing the functions described in the flowchart block (s).
  • each block may represent a portion of a module, segment, or code that includes one or more executable instructions for executing a specified logical function (s).
  • logical function e.g., a module, segment, or code that includes one or more executable instructions for executing a specified logical function (s).
  • the functions noted in the blocks may occur out of order.
  • the two blocks shown in succession may in fact be executed substantially concurrently, or the blocks may sometimes be executed in the reverse order, depending on the corresponding function.
  • ' ⁇ part' used in the present embodiment refers to software or a hardware component such as an FPGA or an ASIC, and ' ⁇ part' performs certain roles.
  • ' ⁇ ' is not meant to be limited to software or hardware.
  • ' ⁇ Portion' may be configured to be in an addressable storage medium or may be configured to play one or more processors.
  • ' ⁇ ' means components such as software components, object-oriented software components, class components, and task components, and processes, functions, properties, procedures, and the like. Subroutines, segments of program code, drivers, firmware, microcode, circuits, data, databases, data structures, tables, arrays, and variables.
  • the functionality provided within the components and the 'parts' may be combined into a smaller number of components and the 'parts' or further separated into additional components and the 'parts'.
  • the components and ' ⁇ ' may be implemented to play one or more CPUs in the device or secure multimedia card.
  • this invention demonstrates the case of a wireless communication system for the convenience of description for example, the content of this invention is applicable also to a wired communication system.
  • 1 is a diagram illustrating a random access procedure in LTE.
  • the base station does not know which terminal is connected. Accordingly, a terminal attempting to access a network through power on or handover may first acquire downlink synchronization through a downlink synchronization signal (SS).
  • SS downlink synchronization signal
  • the terminal may receive a downlink synchronization signal in step S110.
  • the terminal may perform synchronization using the downlink synchronization signal.
  • the terminal may transmit a random access preamble to the base station.
  • a message for transmitting the random access preamble may be referred to as a first message or MSG1.
  • the UE acquires random access channel configuration information (RACH) configuration transmitted through a downlink broadcast signal (BCH (Broadcast channel) / SIB (System Information Block), etc.), and based on this, randomly A random access (RA) sequence may be selected and transmitted to the base station (MSG1).
  • RACH random access channel configuration information
  • BCH Broadcast channel
  • SIB System Information Block
  • the base station receiving the random access preamble may transmit a random access response (RAR) message (hereinafter referred to as a second message or MSG2) to the terminal in step S130.
  • RAR random access response
  • the base station may detect the RACH from each terminal, and may transmit a random access response message including resource allocation information for uplink transmission to the terminal (MSG2).
  • the resource on which the random access response is transmitted may be indicated by the DCI transmitted on the PDCCH, and the DCI may be scrambled using the RA-RNTI (addressed to RA-RNTI on PDCCH).
  • the random access response message may include a physical ID generated based on a preamble identifier, information related to time alignment, initial uplink grant information (uplink resource allocation information), and temporary C-RNTI (temporary C-RNTI). ) May include at least one of information about.
  • the UE may transmit a random access preamble (or PRACH preamble) and determine that transmission has failed and retransmit if there is no response from the base station for a predetermined time.
  • a random access preamble or PRACH preamble
  • the terminal receiving the random access response message from the base station may transmit an RRC connection request message (which may be referred to as a third message or MSG 3) to the base station in step S140.
  • RRC connection request message (which may be referred to as a third message or MSG 3)
  • the terminal may transmit a third message by using an uplink resource configured from the base station, and the terminal may transmit a unique ID of the terminal and a message for RRC connection to the third message.
  • the base station may transmit RRC setup information to the terminal in step S150. Through this, the base station may perform contention resolution. At this time, fast contention resolution addressed to temporary C-RNTI for initial access may be possible through temporary C-RNTI for initial access. However, in the non-contention based random access procedure such as handover, only steps S120 and S130 may be performed during the above process.
  • two different terminals may select the same RA sequence (or RACH sequence) and transmit the same to the base station.
  • the base station detects RACH sequences transmitted from different terminals, but since the RA sequences transmitted by the terminal are the same, the base station cannot distinguish between the different terminals.
  • the base station transmits only one second message (MSG2) corresponding to the RA sequence, so that two different terminals receive the same MSG2.
  • two different terminals transmit the third message MSG3 using the same uplink resource allocated through the same MSG2.
  • these two MSG3 may act as interference with each other.
  • the base station transmits different MSG2 to different terminals even when the UE transmits the same MSG1 by setting the relationship between MSG1 and MSG2 in order to reduce the probability of dispatching. Suggest a method.
  • FIG. 2 is a diagram illustrating a random access procedure in a beamforming based system according to the present invention.
  • Beam reciprocity means that a base station or a terminal can use a reception beam as a transmission beam or a transmission beam as a reception beam. That is, the absence of beam reciprocity indicates a state in which a beam used for downlink reception cannot be used as a transmission beam for uplink transmission or a beam used for uplink reception cannot be used as a transmission beam for downlink transmission. .
  • the base station may transmit a downlink synchronization signal every frame in step S210. At this time, the base station can transmit the downlink synchronization signal while changing the transmission beam in the frame.
  • the terminal may detect the downlink synchronization signal while changing the reception beam every frame.
  • the terminal detecting the downlink synchronization signal selects an RA sequence for random access.
  • the UE may transmit a random access preamble message (first message) in step S220.
  • the terminal may repeatedly transmit the first message so that the base station can receive all the reception beams.
  • 3A illustrates a method for transmitting a first message according to beam reciprocity in a beamforming based system according to the present invention.
  • the beam used for downlink reception cannot be used as a transmission beam for uplink transmission, or the beam used for uplink reception cannot be used as a transmission beam for downlink transmission.
  • the beam reciprocity may be used interchangeably with the term beam correspondence.
  • the terminal may determine the transmission beam of the base station having the largest signal strength by receiving the downlink synchronization signal of the base station and measuring the same. In this case, if there is a beam association, the UE may assume that the transmission beam will be used as the reception beam, and thus, may select the RACH resource 310 corresponding to the reception beam of the base station (UE Tx config. 1). ). Accordingly, the terminal may transmit a first message on the selected RACH resource 310.
  • the terminal may transmit the first message for the received beams of all base stations (UE Tx config. 2). In this case, the terminal may repeatedly transmit the first message using the fixed beam, and the beam of the terminal may be determined according to whether the terminal has beam relevance.
  • the terminal may transmit the first message by using the beam receiving the downlink synchronization signal.
  • the terminal may transmit the first message using any beam.
  • embodiments of the present invention are not limited thereto, and the terminal may transmit a first message by selecting an arbitrary beam regardless of the beam relevance of the terminal. You can also use the method.
  • the interval in which the UE transmits the first message may be referred to as a RACH transmission occasion interval, and the RACH transmission timing interval may include one symbol or a plurality of symbols.
  • one RACH preamble format can be transmitted in the RACH transmission time interval, and the RACH preamble format can transmit one or multiple RACH preambles.
  • One preamble consists of one or multiple RACH sequences, and the RACH sequence consists of one or multiple RACH symbols.
  • FIG. 3B is a diagram illustrating the first message transmission process shown in FIG. 2 in detail.
  • a resource capable of transmitting a RACH preamble format is associated with a downlink signal or a channel (DL signal / channel).
  • a downlink signal or channel may be associated with one RACH resource
  • a plurality of downlink signals or channels may be associated with one RACH resource.
  • one downlink signal or channel may be associated with a plurality of RACH resources.
  • the downlink signal or channel may mean a synchronization signal, a reference signal or a broadcast channel.
  • the downlink signal or channel may be associated with the RACH resource, that is, the downlink signal may be received or the resource where the channel is located may be associated with the RACH resource.
  • a downlink signal or channel 1 331 may be associated with a subset 341 of RACH resources, and the downlink signal or channel 2 332 may be associated with a subset 342 of RACH resources.
  • downlink signals or channels 3 and 4 may be associated with a subset 343 of RACH resources. This shows an example in which a multiple occasion for DL signal / broadcast channel for a downlink signal or channel is associated with a subset of one RACH resource.
  • the UE can select a subset of the RACH resources using downlink measurements and corresponding relationships.
  • a subset of RACH resources may consist of one or a plurality of RACH resources, and the present invention will be described assuming that a subset of RACH resources consists of one RACH resource.
  • the subset of RACH resources may be used in the same concept as the RACH resources.
  • embodiments of the present invention are not limited thereto, and the present invention may be equally applied to a case where a subset of RACH resources consists of a plurality of RACH resources.
  • the UE when there is no beam reciprocity, when the UE detects a specific DL signal / channel, the UE may select a corresponding RACH resource and transmit a RACH preamble format.
  • the UE may transmit one or multiple or repeated preambles during the RACH transmission time interval using the same transmission beam.
  • UE uses the same UE Tx beam.
  • the terminal when there is beam reciprocity, when the terminal detects the downlink signal or the channel 2 332, the terminal corresponds to the broadcast information (BCH) or the channel 2 332 decoded after detecting the downlink signal, the downlink signal.
  • the RACH preamble format may be transmitted in the RACH resource 342.
  • the RACH preamble format consists of one or more RACH preambles
  • the RACH preamble consists of one or more RACH sequences and CPs.
  • the RACH sequence consists of one or a plurality of RACH OFDM symbols.
  • the RACH OFDM symbol may have one or a plurality of subcarrier spacing values. That is, when operating in a low frequency band, it is possible to consider a RACH OFDM symbol (RACH symbol) having a shorter subcarrier spacing compared to a data channel, such as LTE, and when operating in a high frequency band, considering the effect of phase noise Therefore, a RACH OFDM symbol having a subcarrier spacing similar to that of a data channel may be considered. When considering a short length RACH OFDM symbol, repetitive transmission may be performed for coverage expansion.
  • RACH preamble format for this can be classified as shown in FIG.
  • a general RACH preamble format may be represented as follows.
  • Ts represents one sample duration in the time domain.
  • M is the length of the cyclic prefix (CP)
  • G is the length of the guard interval (GT)
  • N is the number of samples of the RACH preamble length (RACH preamble length).
  • G may mean the number of time domain samples corresponding to GT / Ts.
  • the preamble format may be set such that CP and GT are inserted and RACH preamble is repeatedly transmitted.
  • the preamble format may be set such that the CP and the RACH sequence are repeatedly transmitted in pairs, and the GT is inserted last.
  • the preamble format may be set such that CP, RACH sequence, and GT are repeatedly transmitted in pairs.
  • the preamble format may be set to be repeatedly transmitted by configuring the RACH preamble with different RACH sequences in the second option (Format 2-2).
  • the preamble format may be set to be repeatedly transmitted by configuring the RACH preamble with different RACH sequences in the third option.
  • the RACH preamble format 2 may be set to at least one of the above-described formats 2-1 to 2-5. Alternatively, at least one of the above-described formats 2-1 to 2-5 may be used as separate formats, respectively.
  • k is a parameter representing repetitive transmission and may be delivered to the UE through SIB / MIB or higher layer signal.
  • the option shown in Format 2-1 has an advantage that the data channel decoding and the RACH can be detected using only one FFT when the data channel and the RACH are multiplexed.
  • FIG. 5 illustrates an embodiment in which only one FFT is used when the RACH and the data channel are multiplexed.
  • an FFT window is adapted to detect a data channel.
  • the preamble format is repeated without a CP, orthogonality between preamble OFDM symbols is not broken. Therefore, using an FFT window for decoding the data channel, the RACH symbol can be detected with only phase rotation occurring.
  • a guard interval is included between the beam and the beam.
  • FIG. 6 illustrates a case in which FFTs having different sizes are used while using preamble format 2-1.
  • an orthogonal cover code can be applied over several RACH OFDM symbols or RACH sequences as a method for increasing capacity.
  • RA capacity can be increased by using OCCs of [1 1] and [1 -1] while using the same RA sequence.
  • the capacity can be increased through the cyclic prefix in the frequency domain.
  • the length of the RACH sequence for preamble format 2-1 is N and that the sequence mapped in the frequency domain is x, that is, x [0],.
  • the first terminal is x [0], x [1],... , x [N-2], x [N-1] using the RA sequence
  • the second terminal is x [1], x [2],...
  • the extended RA sequence may be used by utilizing the cyclic prefixes of, x [N-1] and x [0].
  • a subset of RACH resources may consist of one or more RACH resources.
  • a subset of one RACH resource the transmit / receive beams of the terminal and the base station may be fixed.
  • a subset of one RACH resource may be associated with one or multiple downlink signals or channel timing (DL signal / channel occasion).
  • the terminal transmits the RACH preamble over a subset of all the RACH resources so that the base station can detect the RACH while changing the reception beam, and the base station has a beam reciprocity
  • one or more RACH preambles may be transmitted by selecting a subset of RACH resources corresponding to DL signal / channel estimated in downlink.
  • the UE may transmit a plurality of RACHs during one RACH transmission occasion period.
  • the base station can receive multiple RACHs while changing the beam of the base station.
  • the base station cannot assume that the detected RACH preamble ID is transmitted from one terminal even though all of the detected RACHs have the same RACH preamble ID. That is, the base station cannot distinguish whether the detected multiple RACHs are RACHs transmitted from one terminal or RACHs transmitted from a plurality of terminals.
  • the base station may consider the following method for transmitting a random access response.
  • the base station can transmit one RAR.
  • the RAR may include grant information, and the grant information may include uplink resource allocation information for transmitting MSG3.
  • the RAR may include timing information for uplink synchronization. When the base station transmits one RAR, it must determine what timing information should be included.
  • the base station may include timing information in the RAR based on the RACH signal having the largest signal size.
  • the base station may include timing information in the RAR based on the RACH having the largest propagation delay.
  • the propagation delay is based on the largest timing, it means that the terminal can transmit the uplink signal at the earliest, and the MSG3 transmission does not collide with the downlink transmission signal of the base station.
  • the advanced timing information is determined not to exceed the CP range at the base station.
  • the base station may detect timing information detected from a plurality of RACH signals and classify them into similar timing-groups. When a classified timing group forms a plurality of groups, the base station may adopt a group having the most elements of the timing group and include corresponding timing information in the RAR.
  • the terminal receiving one RAR may transmit one MSG3.
  • the base station may transmit a plurality of RAR.
  • the terminal may receive a plurality of RARs.
  • the UE may operate as follows depending on which RAR is selected.
  • the UE may transmit the MSG3 by selecting the RAR having the largest SNR among the plurality of RARs.
  • the UE may transmit the MSG3 by selecting the RAR having the largest timing advance value among the plurality of RARs.
  • the propagation delay is based on the largest timing, it means that the UE can transmit the uplink signal at the earliest, and the MSG3 transmission does not collide with the downlink transmission signal of the base station.
  • the advanced timing information is determined not to exceed the CP range at the base station.
  • the UE may form a timing group according to timing information among a plurality of RARs, and may select a group having the most timing information among the formed timing groups, and select an RAR based thereon to transmit MSG3.
  • the base station may set a plurality of RACH transmission occasion intervals for a predetermined period.
  • FIG. 7 is a diagram illustrating an embodiment of setting an RACH transmission time interval during a predetermined period according to the present invention.
  • the base station of the present invention may set a density of RACH transmissions for a predetermined period. That is, one or more RACH transmission occasions may be allocated for a predetermined period before the UE receives the random access response message.
  • the first message can be transmitted using the beam receiving the downlink synchronization signal, but if the terminal cannot use the reception beam as the transmission beam, the first beam while changing the beam You can send a message.
  • the UE transmits the first message using one beam and attempts to receive the second message, and fails to receive the second message. After transmitting the first message, a process of attempting to receive the second message may be repeated.
  • the UE may transmit the random access preamble through the RACH while changing the transmission beam for each RACH transmission occasion.
  • the base station may transmit a random access response message (MSG2) to the terminal with respect to the detected random access preamble, and it is necessary to distinguish which MSG1 the MSG2 corresponds to.
  • MSG2 random access response message
  • the first method of establishing the relationship between the MSG2 and the MSG1 may be set based on the current LTE scheme and may be used for scheduling of the base station.
  • RA procedure random access procedure
  • the UE selects the same preamble ID of the RACH preamble equally (e.g. Preamble 0).
  • the preamble identifier of the present invention may mean a preamble sequence.
  • the preamble 0 may mean a preamble sequence corresponding to index 0 of the plurality of preamble sequences. For example, when 64 preamble sequences are generated, preamble 0 may mean the first preamble sequence.
  • UE0 transmits a random access preamble with Preamble ID 0 using the UL Tx beam 0 through PRACH, and UE1 has Preamble ID 0 using the UL Tx beam x.
  • the random access preamble may be transmitted on the PRACH.
  • the base station may detect preambles (or RACHs) transmitted from UE0 and UE1 using different receive (Rx) beams.
  • the gNB detects a preamble (or RACH) having a preamble ID 0 using different Rx beams, but determines whether the preamble is transmitted from different terminals or whether the preamble transmitted from the same terminal has experienced a multi-channel environment. Can't.
  • the gNB transmits an RAR including PID (Physical ID) 0 based on the detected Preamble ID 0. That is, the base station may transmit a response message 0 having the PID 0 to the terminal, and the UE0 and the UE1 may detect the response message 0 having the PID 0, respectively. In this case, UE0 and UE1 may receive a response message 0 using the selected reception beam while receiving a DL SS / BCH / beam reference signal (BRS) (the DL RX beam chosen during a group of DL SS). / BCH / BRS). Accordingly, each terminal detecting the RAR having PID 0 assumes that the previous MSG1 transmission is successful and transmits the MSG3 using the same UL Tx beam.
  • PRS beam reference signal
  • the two MSG3 signals transmitted by UE0 and UE1 may interact with each other and the gNB may not detect any MSG3.
  • both UEs may not receive an acknowledgment message (which may be called an Ack message, or MSG4) for MSG3.
  • Or gNB can detect only one of the two MSG3. In this case, one UE cannot access the gNB, and the process of transmitting MSG1 is performed again.
  • a base station detects an MSG3 transmitted by UE1 by way of example. Accordingly, the base station may transmit the MSG4 including the UE ID 1 to the terminal. Thus, UE1 can connect to the base station.
  • UE0 may not access the base station, and UE0 may transmit a preamble by changing a UL Tx beam at a next RACH time point (UE0 alters UL Tx beam during next PRACH occasion).
  • the gNB detects MSG1s of different UEs, it should be noted that collision cannot occur because the MSG1 cannot confirm whether the MSG1s are transmitted from different UEs and cannot transmit MSG2 to different UEs. That is, the beamforming based random access procedure (RA procedure) needs to be defined in consideration of a beam, a RACH transmission resource, a preamble ID, and the like in the LTE based RA procedure.
  • RA procedure beamforming based random access procedure
  • the second method of establishing the relationship between the MSG2 and the MSG1 is a method of transmitting transmission information including Tx beam information in the MSG2.
  • the transmission beam information may refer to transmission beam information of a radio transceiver such as a base station, a terminal, a relay, a backhaul, a transmission and reception point (TRP), and the like.
  • the terminal may determine whether the received MSG2 corresponds to the MSG1 transmitted by the terminal by detecting Tx beam information included in the MSG2.
  • the transmission beam degree may be divided into a transmission beam of a base station and a transmission beam of a terminal as follows.
  • the terminal may confirm that the received MSG2 is for the MSG1 transmitted by the terminal. Accordingly, the terminal may transmit the MSG3 using uplink resource allocation information included in the MSG2. In addition, the terminal may transmit the MSG 3 using the terminal beam included in the MSG2.
  • the terminal may transmit the base station beam information estimated when receiving the downlink synchronization signal to the MSG1, and the terminal may transmit the received MSG2 by itself. It can be confirmed that the transmission is for MSG1. Accordingly, the terminal may transmit the MSG3 using uplink resource allocation information included in the MSG2. In addition, the terminal may transmit the MSG3 using the beam of the terminal corresponding to the transmission beam of the base station.
  • the base station should be able to estimate the transmission beam (Tx beam) of the base station, the terminal or other equipment while detecting the RACH in the step of transmitting the MSG1.
  • Tx beam transmission beam
  • the following method may be considered.
  • a method of subset of RACH resource includes Tx beam information
  • the combination of preamble indexes includes transmit beam information.
  • the first method of transmitting the Tx beam information to the base station in the step of transmitting the MSG1 may include a method of increasing the RA sequence set by the number of Tx beam IDs. That is, if 64 preamble IDs are operated in one cell in the existing LTE, the first method may set a preamble ID of 64 x N (number of Tx beams). On the other hand, since the number of Tx beams of the terminal may be different for each terminal or base station, the maximum possible number of Tx beams may be limited and a sequence set may be defined accordingly.
  • the second method of transmitting Tx beam information to the base station in the step of transmitting the MSG1 is a method in which the RACH resource includes the Tx beam information.
  • the RACH resource includes the Tx beam information.
  • a time resource of a subset of RACH resources is already associated with a DL signal / channel.
  • the Tx beam information may be included in a frequency index so that a subset of the RACH resources may include the Tx beam information.
  • FIG. 9 is a diagram illustrating a method in which a RACH resource includes Tx beam information.
  • frequency indexes of subsets of different RACH resources may include Tx beam information.
  • a third method of transmitting Tx beam information to a base station in transmitting MSG1 is a method in which a time domain OCC index includes transmission beam information.
  • an orthogonal cover code may be applied over several RACH OFDM symbols or RACH sequences as a method for increasing capacity.
  • the index of the orthogonal cover code may include transmission beam information.
  • a time domain OCC may be applied to a plurality of preambles having the same preamble identifier. At this time, if there are M OCC indexes corresponding to the number N of transmission beams, each OCC index may mean a set of N / M transmission beams.
  • a fourth method of transmitting Tx beam information to a base station in transmitting MSG1 is a method in which a combination of preamble identifiers includes transmission beam information.
  • the plurality of preambles may have different preamble identifiers.
  • the base station can determine which transmission beam is used when the combination of the preamble identifiers is detected by the base station.
  • the third way to establish the relationship between MSG2 and MSG1 is to define the time between MSG1 and MSG2.
  • 10A and 10B illustrate a method of setting a time between MSG2 and MSG1.
  • the terminal may be configured to receive MSG2 after a predetermined time after transmitting MSG1. Accordingly, when the terminal transmits the MSG1 and then receives the MSG2 after the predetermined time, the terminal may recognize that it is a response message to the MSG1 transmitted by the terminal.
  • the terminal may transmit the MSG3 using uplink allocation information included in the MSG2.
  • the UE may attempt to decode MSG2 for a second time T3 when a first time T2 has elapsed in each RACH resource.
  • FIG. 3 illustrates T3 based on a time point of transmitting MSG1 in the first RACH resource, it is apparent that the T3 section may be changed.
  • the terminal may transmit the MSG3 using uplink resource allocation information included in the MSG2.
  • MSG2 is not received after the predetermined time (there is no MSG2 being decoded), or if MSG2 is received at a time other than the time when MSG2 is set to be received, it may be recognized that it is not a response message to its MSG1. have.
  • the base station may retransmit the MSG1 after a predetermined time T1 'has elapsed.
  • the base station may transmit the information on the predetermined time to the terminal.
  • the base station may be configured to receive the MSG2 after a predetermined time or a predetermined subframe after transmitting the MSG1, the information on the predetermined time or a predetermined subframe RACH configuration information transmitted through the SIB or MIB Can be included.
  • the information may be transmitted to the terminal through an upper layer (eg, an RRC layer).
  • the terminal determines the uplink allocation information included in the MSG2 MSG3 can be sent.
  • the UE may attempt to decode MSG2 for a second time T3 when the first time T2 has elapsed based on the time when MSG1 is transmitted in the first RACH resource.
  • a situation may occur in which MSG1 transmitted by each RACH resource included in the RACH transmission time interval is not distinguished.
  • the MSG3 may be triggered when the UE transmits the MSG3 using uplink resource allocation information included in the MSG2.
  • MSG2 is not received after the predetermined time (there is no MSG2 being decoded), or if MSG2 is received at a time other than the time when MSG2 is set to be received, it may be recognized that it is not a response message to its MSG1. have.
  • the base station may retransmit the MSG1 after a predetermined time T1 'has elapsed.
  • the base station may transmit the information on the predetermined time to the terminal.
  • the base station may be configured to receive the MSG2 after a predetermined time or a predetermined subframe after transmitting the MSG1, the information on the predetermined time or a predetermined subframe RACH configuration information transmitted through the SIB or MIB Can be included.
  • the information may be transmitted to the terminal through an upper layer (eg, an RRC layer).
  • the time shown in FIG. 10B may be defined as shown in Table 3.
  • the information included in Table 3 may be transmitted to the terminal through the RACH configuration information transmitted through the SIB or MIB. Alternatively, the information may be transmitted to the terminal through RRC layer signaling.
  • T means a time point for transmitting the MSG1.
  • T may be configured according to RACH configuration information (RACH configuration).
  • T1 means the time of one RACH occasion (RACH occasion).
  • T2 means a delay time until the UE receives the MSG2 and then decodes it.
  • T3 means a window for receiving MSG2. That is, after transmission of the MSG1, after a certain subframe, it means a time to assume that the MSG2 will be received for a certain number (n) subframes.
  • the predetermined number (n) may inform the UE through RACH configuration information (RACH configuration) transmitted from the SIB / MIB.
  • the access probability when attempting to transmit m MSG1 times can be defined as follows.
  • n s, m , n d, m , n d and n a are the values collected for the time between [(k-1) T, kT], the number of RACH preambles transmitted in m trials, m trial times The number of detected RACH preambles, the number of detected RACH preambles, and the number of UEs that have succeeded in RA.
  • the probability of detection failure after m trials is as follows.
  • the contention ratio may be expressed as follows.
  • the contention ratio can be lowered according to the method of setting the time relationship, which is the third method of establishing the relationship between the MSG1 and the MSG2.
  • a method of establishing a relationship between MSG2 and MSG1 may be designed in consideration of one or a plurality of RACH resources within a RACH transmission occasion as shown in Table 4 as follows.
  • the time T1 shown in Table 3 represents one RACH transmission occasion, while T 1, k shown in Table 4 represents the time of a subset of RACH resources within one RACH transmission occasion. It may include a time index.
  • a plurality of RACH resource subsets may be included at one RACH transmission time point, and T 1, k may represent indices of the plurality of RACH resource subsets.
  • the terminal transmitting MSG1 in the RACH resource subset indicated by the index may decode MSG2 for a T3 time after the T2 time, and if the MSG2 decoded for the T3 time exists, the MSG2 is included in the MSG2.
  • MSG3 may be transmitted using uplink resource allocation information.
  • the MSG1 may be retransmitted after the T1 'time.
  • the fourth method for establishing the relationship between MSG1 and MSG2 is to use a preamble ID.
  • the preamble ID may mean a preamble sequence.
  • the method using the Preamble ID may be generated as follows in consideration of a subset of RACH resources.
  • Preamble ID is designed to include a time index of a subset of RACH resources
  • Preamble ID is designed to include frequency index of subset of RACH resource
  • Preamble ID is designed to include frequency and time / index of subset of RACH resource
  • the RACH preamble ID in LTE is generated as follows.
  • 64 preamble IDs are operated, and the UE may select a root index for generating a preamble sequence (RACH OFDM symbol) through a parameter transmitted in SIB2. (Base sequence).
  • the terminal may extend the preamble ID according to the cyclic shift value interval (Ncs) based on the selected root index.
  • Ncs cyclic shift value interval
  • the UE selects the next root index to extend the preamble ID.
  • the preamble ID is extended according to Ncs. In this way, a total of 64 preamble IDs are generated.
  • the method of generating a preamble ID according to the present invention may be generated by being extended by a time or frequency index of a subset of RACH resources in a method of generating a preamble ID in LTE. have.
  • a preamble ID may be generated in the same manner as in LTE.
  • preamble format 2 (2.1 to 2.5) for a high frequency system
  • the UE may generate a preamble ID including information indicating a RACH resource, so that the preamble ID may indicate a relationship between the MSG1 and the MSG2. Accordingly, when the MSG2 is detected, the UE may determine which RACH resource succeeds in transmitting the MSG1.
  • the information indicating the RACH resource may be associated with a downlink signal or a channel. Accordingly, in the present invention, information indicating a downlink signal or a channel may be used to generate a preamble ID. For example, the time or frequency index of the subframe receiving the downlink synchronization signal may be used to generate the preamble ID.
  • embodiments of the present invention are not limited thereto, and a subframe or downlink signal that receives a reference signal or a broadcast signal may be used to generate a preamble ID.
  • FIG. 11 is a diagram illustrating a relationship between MSG1 and MSG2 according to a preamble ID according to an embodiment of the present invention.
  • UE0 and UE1 may select the same root index and use the same to generate the same preamble sequence.
  • UE0 and UE1 may transmit MSG1 in the same subframe.
  • MSG1 is transmitted using a subset of different RACH resources but using the same subframe.
  • the base station may detect a preamble ID from different RACH resources.
  • the base station establishing the beam reciprocity may determine that different preamble IDs are preamble IDs transmitted from different terminals.
  • the base station without beam reciprocity cannot determine whether the preamble ID detected in different RACH resources is a RACH preamble ID transmitted from the same terminal or a RACH preamble ID transmitted from different terminals.
  • the base station may assign an identifier (for example, a physical ID (PID)) according to a time or frequency index of a subset of the detected RACH resources.
  • PID physical ID
  • the RAR including the same may be generated and transmitted to the terminal.
  • the time or frequency index of the subset of RACH resources may be represented by the OFDM symbol index / slot index / sub frame index and the start point of the frequency domain of the time when the RACH is transmitted.
  • the terminal may determine whether the response message is transmitted to the terminal.
  • the base station may transmit a RAR including PID 0 to UE0 and may transmit a RAR including PID 1 to UE1.
  • the terminal may select a MSG2 suitable for the terminal by detecting a PID according to the preamble ID used for the MSG1 transmission among the received RARs. That is, the terminal may detect the PID by decoding the MSG2 and transmit the MGS3 according to uplink resource allocation information included in the MSG2 in which the PID corresponding to the time or frequency index of the RACH resource in which the MSG1 is transmitted is detected.
  • RA-RNTI is defined as follows in LTE.
  • the terminal transmitting the MSG1 monitors the PDCCH for the RAR. That is, the UE monitors whether there is an RAR transmitted through the PDCCH.
  • the RAR transmitted through the PDCCH is divided into RA-RNTI. That is, the terminal may distinguish the PDCCH indicating the RAR transmitted to the terminal using the RA-RNTI.
  • the UE When the UE transmits the MSG1 using the same frequency resource in the same subframe, since the RA-RATI value is the same and the PDCCH according to this value is the same, the UE decodes the PDCCH and decodes the MSG2 indicated by the PDCCH. That is, if the terminal uses the same preamble ID and transmits MSG1 with the same RA-RNTI, even if the base station detects the RACH in a subset of different RACH resources, it may be distinguished that it is transmitted from different terminals. Can't.
  • the present invention describes a method for the UE to distinguish MSG2 by associating the RA-RNTI with a subset of different RACH resources.
  • the method of associating a RA-RNTI with a subset of RACH resources is as follows.
  • the time index of a subset of RACH resources may be used to generate the RA-RNTI.
  • RA-RNTI 1 + t_id, t_id: time index of subset of RACH resource
  • a frequency index of a subset of RACH resources may be used to generate the RA-RNTI.
  • RA-RNTI 1 + f_id, f_id: frequency index of subset of RACH resource
  • the time or frequency index of a subset of RACH resources may be used to generate the RA-RNTI.
  • RA-RNTI 1 + t_id + f_id
  • a subframe index and a time / frequency index of a subset of RACH resources may be used to generate the RA-RNTI.
  • RA-RNTI 1 + t_id + f_id + index of the subframe
  • the information indicating the RACH resource may be associated with a downlink signal or a channel. Accordingly, in the present invention, information indicating a downlink signal or a channel may be used to generate the RA-RNTI. For example, the time or frequency index of the subframe that received the downlink synchronization signal may be used to generate the RA-RNTI. However, embodiments of the present invention are not limited thereto, and a subframe or downlink signal that receives a reference signal or a broadcast signal may be used to generate the RA-RNTI.
  • FIG. 12 illustrates a relationship between MSG1 and MSG2 according to RA-RNTI according to an embodiment of the present invention.
  • FIG. 12 illustrates an embodiment of decoding a RAR when a time or frequency index and a subframe index of a subset of RACH resources are associated with a RA-RNTI. Shows.
  • the base station can detect the same RACH sequence in different RACH resources.
  • the base station without beam reciprocity cannot distinguish whether the RACH sequence transmitted from different terminals or the RACH sequence transmitted from the same terminal.
  • the base station for which the beam reciprocity is established may distinguish the RACH sequence transmitted from different terminals. Since the Preamble ID (RACH sequence) is the same, the PID included in MSG2 is also the same.
  • the RA-RNTI may be differently determined for each terminal. Accordingly, since the RA-RNTI used to scramble the CRC of the control information indicating the MSG2 is different from each other, the two terminals may decode control information corresponding to the RA-RNTI suitable for the terminal. In addition, MSG2 included in the control information can also be decoded.
  • the sixth way to establish the relationship between MSG1 and MSG2 is to use the scrambling ID of MSG2.
  • the following describes a method of setting the relationship between MSG1 and MSG2 using the scrambling ID of MSG2.
  • the initial value of scrambling is defined as follows in LTE.
  • the scrambling ID may be determined according to the scrambling initial value determined as described above.
  • MSG2 is transmitted on PDSCH.
  • n_RNTI is an RNTI associated with the PDSCH
  • q is a codeword
  • ns is a slot number
  • NcellID is a cell ID.
  • the present invention proposes a method of differently applying PDSCH scrambling by using a subset of RACH resources when generating an initial value (Cinit).
  • the UE may decode MSG2 suitable for itself by scrambling MSG2 using different scrambling.
  • a method of associating an initial value of scrambling with a subset of RACH resources is as follows.
  • the information indicating the RACH resource may be associated with a downlink signal or a channel. Accordingly, in the present invention, information indicating a downlink signal or a channel may be used to generate a scrambling ID. For example, the time or frequency index of the subframe receiving the downlink synchronization signal may be used to generate the scrambling ID. However, embodiments of the present invention are not limited thereto, and a subframe or downlink signal that receives a reference signal or a broadcast signal may be used to generate a scrambling ID.
  • FIG. 13 is a diagram illustrating an operation sequence of a terminal according to an embodiment of the present invention.
  • the terminal may transmit a random access preamble to the base station in step S1310.
  • the terminal may receive system information through a broadcast channel before transmitting the random access preamble, and the system information may include random access related configuration information (RACH configuration information).
  • RACH configuration information random access related configuration information
  • the random access related configuration information may include root index information for generating a random access preamble.
  • the random access related setting information may further include time information for use in decoding the above-described response message.
  • the terminal may transmit a random access preamble in the RACH resource associated with the downlink signal or the channel.
  • the UE may transmit a random access preamble in a RACH transmission occasion section consisting of a plurality of RACH resources.
  • the terminal may receive a response message for the random access preamble.
  • the terminal may receive the response message using the selected reception beam while receiving the DL SS / BCH / BRS.
  • the terminal may decode the response message using the resource index on which the downlink signal is transmitted. Or, the terminal can decode the response message using the index of the resource including the downlink channel.
  • the terminal may perform downlink synchronization by receiving a downlink synchronization signal from the base station before transmitting the random access preamble, and the terminal may decode a response message based on the resource receiving the downlink synchronization signal.
  • the terminal may receive system information or broadcast information through a broadcast channel from the base station before transmitting the random access preamble, and the terminal may decode a response message based on a resource for receiving the system information or broadcast information. have.
  • the decoding step will be described in detail below.
  • the base station may transmit transmission information including the transmission beam information in the response message, and the terminal may decode the message when the response message includes information corresponding to its transmission beam information or the estimated transmission beam information of the base station. .
  • the transmission beam information may be associated with a resource index including a downlink signal or a resource index including a downlink channel
  • the terminal may include a resource index including a downlink signal or a resource index including a downlink channel. It is possible to determine the transmission beam information using and to decode the response message.
  • the base station may define a time between the random access preamble and the random access response message, and the terminal may decode the random access response message when the random access response message is received for the time calculated using the time of transmitting the random access preamble.
  • the resource transmitting the random access preamble may be associated with a resource index including a downlink signal or a resource index including a downlink channel, and the terminal includes a resource index or a downlink channel through which the downlink signal is transmitted.
  • the resource index may be used to determine when a random access preamble is transmitted and when a random access response is to be received, and to monitor whether the response message is received by monitoring the PDCCH during the time. Therefore, when a response message is received during the time, it can recognize that it is a response message to the preamble transmitted by itself and decode it.
  • the UE may determine the RACH resource using the preamble sequence and transmit the same to the base station.
  • the terminal may use the time or frequency index of the resource to transmit the preamble when determining the preamble sequence.
  • a resource for transmitting the preamble may be associated with a resource index including a downlink signal or a resource index including a downlink channel
  • the terminal may include a resource index including a downlink signal or a resource index including a downlink channel. Determining a time or frequency to transmit a random access preamble using the, to generate a preamble sequence using this can be transmitted to the base station.
  • the base station can distinguish from which RACH resource the received random access preamble is transmitted, and can transmit a response message to which the physical identifier (PID) is differently assigned according to the time or frequency index of the RACH resource.
  • PID physical identifier
  • the terminal may detect the PID by decoding the response message and determine whether the terminal corresponds to the time or frequency index of the RACH resource that transmitted the random access preamble.
  • the terminal may scramble control information indicating a resource to which the response message is to be transmitted using the RA-RNTI determined using the time or frequency index of the RACH resource.
  • the base station may scramble control information using the RA-RNTI generated by using the time or frequency index of the RACH resource to which the preamble is transmitted, and the terminal descrambles the control information using the RA-RNTI, and controls the The response message received from the resource indicated by the information can be decoded.
  • the resource for transmitting the preamble may be associated with a resource index including a downlink signal or a resource index including a downlink channel
  • the UE may include a resource index or a downlink channel including a downlink signal.
  • the index may be used to determine the time or frequency to transmit the random access preamble
  • the RA-RNTI may be used to descramble the control information.
  • the terminal may decode the response message from the resource indicated by the descrambled control information.
  • the terminal may decode the response message using the scrambling ID determined using the time or frequency index of the RACH resource. Accordingly, the terminal may decode the response message using the scrambling ID determined using the time or frequency index of the RACH resource.
  • the resource for transmitting the preamble may be associated with a resource index including a downlink signal or a resource index including a downlink channel
  • the UE may include a resource index or a downlink channel including a downlink signal.
  • the index may be used to determine the time or frequency to transmit the random access preamble, and the scrambling ID may be used to decode the response message.
  • the UE may transmit an RRC connection request message to the base station in step S1340.
  • the terminal may transmit the RRC connection request message by using uplink resource allocation information included in the response message.
  • FIG. 14 is a diagram illustrating an operation sequence of a base station according to an embodiment of the present invention.
  • the base station may receive a random access preamble in step S1410.
  • the plurality of terminals may receive the same random access preamble at one RACH transmission time point. Therefore, the base station may transmit the response message by dividing it.
  • the base station may transmit a response message for the random access preamble in step S1420.
  • the base station may include specific information so that the terminal can distinguish the response message, or may process the message using the specific information. That is, the base station may generate a response message based on the specific information.
  • the specific information may be determined based on a resource index on which a downlink signal is transmitted or an index of a resource including a downlink channel.
  • the terminal may decode the response message using the resource index on which the downlink signal is transmitted. Or, the terminal can decode the response message using the index of the resource including the downlink channel.
  • the base station may transmit transmission information including the transmission beam information in the response message.
  • the base station may estimate the transmission beam and include it in the response message.
  • the transmission beam information may be associated with a resource index including a downlink signal or a resource index including a downlink channel
  • the base station may include a resource index including a downlink signal or a resource index including a downlink channel.
  • the transmission beam information may be determined using the ACK, and may be included in the response message.
  • the response message may be decoded based on a resource index on which a downlink signal is transmitted or a resource index including a downlink channel.
  • the base station may define a time between the random access preamble and the random access response message, and may transmit a random access response message after a predetermined time in the RACH resource transmitted with the preamble.
  • the resource transmitting the random access preamble may be associated with a resource index including a downlink signal or a resource index including a downlink channel
  • the terminal includes a resource index or a downlink channel through which the downlink signal is transmitted.
  • the resource index may be used to determine when a random access preamble is transmitted and when a random access response is to be received, and to monitor whether the response message is received by monitoring the PDCCH during the time. Therefore, when a response message is received during the time, it can recognize that it is a response message to the preamble transmitted by itself and decode it. That is, the response message may be decoded based on a resource index on which a downlink signal is transmitted or a resource index including a downlink channel.
  • the UE may determine the RACH resource using the preamble sequence and transmit the same to the base station. Accordingly, the base station may determine whether the preamble is transmitted from which resource using the received preamble sequence, and may transmit a response message to which the physical identifier (PID) is differently allocated according to the time or frequency index of the corresponding resource. .
  • PID physical identifier
  • the resource for transmitting the preamble may be associated with a resource index including a downlink signal or a resource index including a downlink channel
  • a response message may include a resource index or a downlink channel including a downlink signal. It can be decoded based on the index.
  • the base station may scramble the control information using the RA-RNTI generated by using the time or frequency index of the RACH resource in which the preamble is transmitted. Accordingly, the terminal may descramble control information using the RA-RNTI and decode a response message received from a resource indicated by the control information.
  • the resource for transmitting the preamble may be associated with a resource index including a downlink signal or a resource index including a downlink channel, and the response message includes a resource index or a downlink channel through which the downlink signal is transmitted. Decode based on the resource index.
  • the base station may scramble the response message using the scrambling ID determined using the time or frequency index of the RACH resource.
  • the terminal may decode the response message using the scrambling ID determined using the time or frequency index of the RACH resource.
  • the resource for transmitting the preamble may be associated with a resource index including a downlink signal or a resource index including a downlink channel, and the response message includes a resource index or a downlink channel through which the downlink signal is transmitted. Decode based on the resource index.
  • the base station may include uplink resource allocation information in the response message. Therefore, after transmitting the response message, the base station may receive the RRC connection request message in step S1430. The base station may receive the RRC connection request message from the resource according to the uplink resource allocation information included in the response message.
  • 15 is a diagram showing the structure of a terminal according to an embodiment of the present invention.
  • the terminal may include a transceiver 1510, a controller 1520, and a storage 1530.
  • the transceiver 1510 may transmit / receive a signal with a base station, and may include an interface unit for this.
  • the transceiver 1510 may receive random access related configuration information and a synchronization signal from a base station, transmit a random access preamble, and receive a response message thereto.
  • the controller 1520 may control the operation of the terminal, and may control the entire terminal to perform the operation described in the above embodiment.
  • the controller 1520 may include at least one processor.
  • the processor may also be controlled by a program containing instructions for executing the methods described in the embodiments of the present specification.
  • the program may be stored in a storage medium, and the storage medium may include a volatile or nonvolatile memory.
  • the memory may be a medium capable of storing data, and there is no limitation in the form thereof when the instruction can be stored.
  • the controller 1520 may control the random access preamble to be transmitted to the base station.
  • the controller 1520 may receive a response message for the random access preamble. Details of the controller 1520 transmitting and receiving the random access preamble are the same as described above, and will be omitted below.
  • the controller 1520 may decode the response message using the resource index on which the downlink signal is transmitted. Alternatively, the controller 1520 may decode the response message using the index of the resource including the downlink channel.
  • the controller 1520 may perform downlink synchronization by receiving a downlink synchronization signal from a base station before transmitting the random access preamble, and the controller 1520 may receive a response message based on the resource receiving the downlink synchronization signal. Can be decoded. Alternatively, the controller 1520 may receive system information or broadcast information through a broadcast channel from the base station before transmitting the random access preamble, and the terminal may receive a response message based on the resource from which the system information or broadcast information is received. Can be decoded.
  • the controller 1520 may transmit the RRC connection request message to the base station.
  • the controller 1520 may transmit the RRC connection request message by using uplink resource allocation information included in the response message.
  • 16 is a diagram illustrating a structure of a base station according to an embodiment of the present invention.
  • the base station may include a transceiver 1610, a controller 1620, and a storage 1630.
  • the transceiver 1610 may transmit and receive a signal with the terminal, and may include an interface unit for this.
  • the transceiver 1510 may transmit random access related configuration information and a synchronization signal to the terminal, receive a random access preamble, and transmit a response message thereto.
  • the controller 1620 may control the operation of the terminal, and may control the entire terminal to perform the operation described in the above embodiment.
  • the controller 1620 may include at least one processor.
  • the processor may also be controlled by a program containing instructions for executing the methods described in the embodiments of the present specification.
  • the program may be stored in a storage medium, and the storage medium may include a volatile or nonvolatile memory.
  • the memory may be a medium capable of storing data, and there is no limitation in the form thereof when the instruction can be stored.
  • the controller 1620 may receive a random access preamble.
  • the plurality of terminals may receive the same random access preamble at one RACH transmission time point. Therefore, the base station may transmit the response message by dividing it.
  • the controller 1620 may transmit a response message for the random access preamble.
  • the controller 1620 may include specific information so that the terminal can distinguish the response message, or may process the message using the specific information. That is, the base station may generate a response message based on the specific information.
  • the specific information may be determined based on a resource index on which a downlink signal is transmitted or an index of a resource including a downlink channel.
  • the controller 1620 may include uplink resource allocation information in the response message. Therefore, after transmitting the response message, the controller 1620 may receive the RRC connection request message. The controller 1620 may receive an RRC connection request message from a resource according to uplink resource allocation information included in the response message.

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  • Mobile Radio Communication Systems (AREA)

Abstract

La présente invention concerne une technique de communication pour faire converger une technologie de l'Internet des objets (IoT) avec un système de communication de cinquième génération (5G) pour prendre en charge un débit de transmission de données supérieur dépassant celui d'un système de quatrième génération (4G), et un système associé. La présente invention peut s'appliquer à un service intelligent (par exemple, un service de maison intelligente, de bâtiment intelligent, de ville intelligente, de voiture intelligente ou de voiture connectée, de soins de santé, d'éducation informatique, de commerce de détails, de sécurité et de sûreté, ou analogue) sur la base d'une technologie de communication 5G et d'une technologie d'IoT. Un procédé pour un terminal selon la présente invention consiste à : transmettre un préambule d'accès aléatoire par l'intermédiaire d'une ressource associée à une ressource par l'intermédiaire de laquelle un signal de synchronisation de liaison descendante a été reçu ; recevoir un message de réponse d'accès aléatoire au préambule d'accès aléatoire ; et décoder le message de réponse d'accès aléatoire par utilisation d'informations déterminées sur la base de la ressource par l'intermédiaire de laquelle le signal de synchronisation de liaison descendante a été reçu.
PCT/KR2017/003696 2016-04-04 2017-04-04 Procédé et appareil pour décoder un message de réponse d'accès aléatoire dans un système de communication sans fil WO2017176033A1 (fr)

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US16/090,523 US10701684B2 (en) 2016-04-04 2017-04-04 Method and apparatus for decoding random access response message in wireless communication system
EP17779333.8A EP3432673B1 (fr) 2016-04-04 2017-04-04 Procédé et appareil pour décoder un message de réponse d'accès aléatoire dans un système de communication sans fil
US16/915,138 US11395289B2 (en) 2016-04-04 2020-06-29 Method and apparatus for decoding random access response message in wireless communication system

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US201662317943P 2016-04-04 2016-04-04
US62/317,943 2016-04-04
KR10-2017-0015793 2017-02-03
KR1020170015793A KR20170114916A (ko) 2016-04-04 2017-02-03 RA procedure 에서 MSG1과 MSG2의 관계를 설정하는 방법

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US16/915,138 Continuation US11395289B2 (en) 2016-04-04 2020-06-29 Method and apparatus for decoding random access response message in wireless communication system

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WO2020060315A1 (fr) * 2018-09-21 2020-03-26 엘지전자 주식회사 Procédé pour procédure d'accès aléatoire pour un terminal dans un système de communication sans fil prenant en charge une bande sans licence, et dispositifs le prenant en charge
WO2020068596A1 (fr) * 2018-09-26 2020-04-02 Intel Corporation Transmission à accès multiple non orthogonal (noma) destinée à un canal d'accès aléatoire à faible latence (rach)
CN111817007B (zh) * 2019-04-12 2022-02-01 正文科技股份有限公司 天线控制方法及通讯系统控制方法
CN111817007A (zh) * 2019-04-12 2020-10-23 正文科技股份有限公司 天线控制方法及通讯系统控制方法
CN112399570A (zh) * 2019-08-14 2021-02-23 大唐移动通信设备有限公司 一种资源分配方法及装置
CN114175565A (zh) * 2021-10-28 2022-03-11 北京小米移动软件有限公司 随机接入方法、装置、设备及存储介质

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