WO2022154585A1 - Procédé et dispositif de rapport d'informations d'accès aléatoire dans un système de communication sans fil - Google Patents

Procédé et dispositif de rapport d'informations d'accès aléatoire dans un système de communication sans fil Download PDF

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Publication number
WO2022154585A1
WO2022154585A1 PCT/KR2022/000750 KR2022000750W WO2022154585A1 WO 2022154585 A1 WO2022154585 A1 WO 2022154585A1 KR 2022000750 W KR2022000750 W KR 2022000750W WO 2022154585 A1 WO2022154585 A1 WO 2022154585A1
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Prior art keywords
random access
information
terminal
step random
report
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PCT/KR2022/000750
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English (en)
Korean (ko)
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김상범
아기왈아닐
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삼성전자 주식회사
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    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04W—WIRELESS COMMUNICATION NETWORKS
    • H04W74/00—Wireless channel access
    • H04W74/08—Non-scheduled access, e.g. ALOHA
    • H04W74/0833—Random access procedures, e.g. with 4-step access
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04W—WIRELESS COMMUNICATION NETWORKS
    • H04W24/00—Supervisory, monitoring or testing arrangements
    • H04W24/10—Scheduling measurement reports ; Arrangements for measurement reports
    • 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 disclosure relates to operation of a terminal and a base station in a mobile communication system, and more particularly, to a method and apparatus for reporting random access information in two steps in a mobile communication system.
  • the 5G communication system or the pre-5G communication system is called a system after the 4G network (Beyond 4G Network) communication system or the LTE system after (Post LTE).
  • the 5G communication system is being considered for implementation in a very high frequency (mmWave) band (eg, such as a 60 gigabyte (60 GHz) band).
  • mmWave very high frequency
  • FQAM Hybrid FSK and QAM Modulation
  • SWSC Small Cell Superposition Coding
  • ACM advanced coding modulation
  • FBMC Fan Bank Multi Carrier
  • NOMA advanced access technologies, (non orthogonal multiple access), and sparse code multiple access (SCMA) are being developed.
  • IoT Internet of Things
  • IoE Internet of Everything
  • M2M Machine Type Communication
  • MTC Machine Type Communication
  • IoT intelligent IT services that create new values in human life by collecting and analyzing data generated from connected objects can be provided.
  • IoT is a field of smart home, smart building, smart city, smart car or connected car, smart grid, health care, smart home appliance, advanced medical service, etc. can be applied to
  • 5G communication system to the IoT network.
  • technologies such as sensor network, machine to machine (M2M), and machine type communication (MTC)
  • 5G communication technology is implemented by techniques such as beamforming, MIMO, and array antenna.
  • cloud radio access network cloud RAN
  • cloud RAN cloud radio access network
  • An object of the present invention is to provide an apparatus and method for effectively reporting random access information in a mobile communication system according to the disclosed embodiment.
  • a method of operating a terminal in a wireless communication system includes the steps of storing a random access result for at least one of a 2-step random access or a 4-step random access, receiving a report request for the random access result from a base station, and responding to the report request based on the base station, transmitting a radio resource control (RRC) message including at least one random access report information, wherein the random access report information is information related to 2-step random access or 4-step random It may include at least one of information related to access.
  • RRC radio resource control
  • FIG. 1A is a diagram illustrating a structure of a next-generation mobile communication system according to an embodiment of the present disclosure.
  • 1B is a diagram for explaining a random access process according to an embodiment of the present disclosure.
  • 1C is a flowchart of a two-step random access process according to an embodiment of the present disclosure.
  • 1D is a conceptual diagram of a process of reporting a two-step random access according to an embodiment of the present disclosure.
  • 1E is a flowchart of a process of reporting a two-step random access according to an embodiment of the present disclosure.
  • 1F is a diagram illustrating a method of reporting a two-step/four-step random access according to an embodiment of the present disclosure.
  • 1G is a flowchart of an operation of a UE reporting stage 2/4 stage random access according to an embodiment of the present disclosure.
  • 1H is a block diagram illustrating a structure of a terminal in a wireless communication system according to the present disclosure.
  • 1I is a block diagram illustrating a structure of a base station in a wireless communication system according to the present disclosure.
  • a method of operating a terminal in a wireless communication system includes the steps of storing a random access result for at least one of 2-step random access or 4-step random access, receiving a report request for the random access result from a base station, and based on the report request, transmitting to the base station a radio resource control (RRC) message including at least one random access report information, wherein the random access report information is information related to two-step random access Alternatively, it may include at least one of information related to 4-step random access.
  • RRC radio resource control
  • the random access report information indicates that the fallback from the 2-step random access to the 4-step random access was performed by the terminal in at least one random access attempt for the 2-step random access. Indicative information may be included.
  • a method of operating a terminal includes: receiving a system information message indicating 2-step random access from the base station; transmitting msgA to the base station based on the system information message; and receiving msgB including information indicating a fallback from the 2-step random access to the 4-step random access based on the msgA.
  • the indication information indicating that the fallback has been performed by the terminal may be included in the random access report information based on the msgB.
  • the random access report information includes at least one 2-step random access-related information and at least one It may include information related to 4-step random access.
  • a method of operating a terminal the terminal switching from the 2-step random access to the 4-step random access based on the maximum number of transmissions of msgA; further comprising, the RRC
  • the message may include up to 8 random access report information.
  • the random access report information may include information related to random access type switching performed by the terminal.
  • the information related to switching of the random access type may correspond to information related to the maximum number of transmissions of msgA in the 2-step random access before switching to the 4-step random access.
  • a method of operating a base station in a wireless communication system includes: transmitting, to a terminal, a report request on a random access result for at least one of two-step random access and four-step random access stored by the terminal; and receiving, from the terminal, a radio resource control (RRC) message including at least one random access report information, based on the report request, wherein the random access report information includes a 2-step random access and It may include at least one of related information or information related to 4-step random access.
  • RRC radio resource control
  • the random access report information indicates that the fallback from the 2-step random access to the 4-step random access was performed by the terminal in at least one random access attempt for the 2-step random access. Indicative information may be included.
  • a method of operating a base station includes transmitting a system information message instructing a two-step random access to the terminal; receiving msgA from the terminal based on the system information message; and transmitting, to the terminal based on the msgA, msgB including information indicating a fallback from the 2-step random access to the 4-step random access;
  • the indication information indicating that the execution has been performed may be included in the random access report information based on the msgB.
  • the random access report information includes at least one 2-step random access-related information and at least one It may include information related to 4-step random access.
  • the terminal according to an embodiment of the present disclosure switches from the 2-step random access to the 4-step random access based on the maximum number of transmissions of msgA, and the RRC message may include up to 8 random access report information. have.
  • the random access report information may include information related to random access type switching performed by the terminal.
  • the information related to switching of the random access type may correspond to information related to the maximum number of transmissions of msgA in the 2-step random access before switching to the 4-step random access.
  • a terminal operating in a wireless communication system may be provided.
  • the terminal includes a transceiver; and at least one processor, wherein the at least one processor stores a random access result for at least one of a 2-step random access or a 4-step random access, and receives a report request for the random access result from the base station receiving, and transmitting, to the base station, based on the report request, a radio resource control (RRC) message including at least one random access report information, wherein the random access report information is information related to two-step random access or It may include at least one of information related to 4-step random access.
  • RRC radio resource control
  • each block of the flowchart diagrams and combinations of the flowchart diagrams may be performed by computer program instructions.
  • These computer program instructions may be embodied in a processor of a general purpose computer, special purpose computer, or other programmable data processing equipment, such that the instructions performed by the processor of the computer or other programmable data processing equipment are not described in the flowchart block(s). It creates a means to perform functions.
  • These computer program instructions may also be stored in a computer-usable or computer-readable memory that may direct a computer or other programmable data processing equipment to implement a function in a particular manner, and thus the computer-usable or computer-readable memory.
  • the instructions stored in the flowchart block(s) may produce an article of manufacture containing instruction means for performing the function described in the flowchart block(s).
  • the computer program instructions may also be mounted on a computer or other programmable data processing equipment, such that a series of operational steps are performed on the computer or other programmable data processing equipment to create a computer-executed process to create a computer or other programmable data processing equipment. It is also possible that instructions for performing the processing equipment provide steps for performing the functions described in the flowchart block(s).
  • each block may represent a module, segment, or portion of code that includes one or more executable instructions for executing specified logical function(s). It should also be noted that in some alternative implementations it is also possible for the functions recited in the blocks to occur out of order. For example, two blocks shown one after another may in fact be performed substantially simultaneously, or it is possible that the blocks are sometimes performed in the reverse order according to the corresponding function.
  • ' ⁇ unit' used in this embodiment means software or hardware components such as FPGA (Field Programmable Gate Array) or ASIC (Application Specific Integrated Circuit), and ' ⁇ unit' performs certain roles do.
  • '-part' is not limited to software or hardware.
  • ' ⁇ unit' may be configured to reside on an addressable storage medium or may be configured to refresh one or more processors.
  • ' ⁇ ' denotes components such as software components, object-oriented software components, class components, and task components, and processes, functions, properties, and procedures. , subroutines, segments of program code, drivers, firmware, microcode, circuitry, data, databases, data structures, tables, arrays, and variables.
  • components and ' ⁇ units' may be combined into a smaller number of components and ' ⁇ units' or further separated into additional components and ' ⁇ units'.
  • components and ' ⁇ units' may be implemented to play one or more CPUs in a device or secure multimedia card.
  • ' ⁇ unit' may include one or more processors.
  • a term for identifying an access node used in the following description a term referring to a network entity (network entity), a term referring to messages, a term referring to an interface between network objects, and various identification information Reference terms and the like are exemplified for convenience of description. Accordingly, the present disclosure is not limited to the terms described below, and other terms referring to objects having equivalent technical meanings may be used.
  • eNB may be used interchangeably with gNB for convenience of description. That is, a base station described as an eNB may represent a gNB. Also, the term terminal may refer to mobile phones, NB-IoT devices, sensors, as well as other wireless communication devices.
  • the base station is a subject performing resource allocation of the terminal, and may be at least one of a gNode B, an eNode B, a Node B, a base station (BS), a radio access unit, a base station controller, or a node on a network.
  • the terminal may include a user equipment (UE), a mobile station (MS), a cellular phone, a smart phone, a computer, or a multimedia system capable of performing a communication function.
  • UE user equipment
  • MS mobile station
  • cellular phone a smart phone
  • computer or a multimedia system capable of performing a communication function.
  • multimedia system capable of performing a communication function.
  • the present disclosure is applicable to 3GPP NR (5th generation mobile communication standard).
  • the present disclosure provides intelligent services (eg, smart home, smart building, smart city, smart car or connected car, healthcare, digital education, retail business, security and safety related services based on 5G communication technology and IoT-related technology) etc.) can be applied.
  • eNB may be used interchangeably with gNB for convenience of description. That is, a base station described as an eNB may represent a gNB.
  • the term terminal may refer to mobile phones, NB-IoT devices, sensors, as well as other wireless communication devices.
  • a wireless communication system for example, 3GPP's HSPA (High Speed Packet Access), LTE (Long Term Evolution or E-UTRA (Evolved Universal Terrestrial Radio Access)), LTE-Advanced (LTE-A), LTE-Pro, 3GPP2 HRPD (High Rate Packet Data), UMB (Ultra Mobile Broadband), and IEEE 802.16e, such as communication standards such as broadband wireless broadband wireless providing high-speed, high-quality packet data service It is evolving into a communication system.
  • HSPA High Speed Packet Access
  • LTE-A Long Term Evolution-A
  • LTE-Pro LTE-Pro
  • 3GPP2 HRPD High Rate Packet Data
  • UMB Ultra Mobile Broadband
  • IEEE 802.16e such as communication standards such as broadband wireless broadband wireless providing high-speed, high-quality packet data service It is evolving into a communication system.
  • an Orthogonal Frequency Division Multiplexing (OFDM) scheme is employed in a downlink (DL; DownLink), and Single Carrier Frequency Division Multiple Access (SC-FDMA) in an uplink (UL).
  • Uplink refers to a radio link in which a UE (User Equipment or MS; Mobile Station) transmits data or control signals to a base station (eNode B or BS; Base Station).
  • eNode B or BS Base Station
  • the multiple access method as described above divides the data or control information of each user by allocating and operating the time-frequency resources to which data or control information is to be transmitted for each user so that they do not overlap each other, that is, orthogonality is established. .
  • Enhanced Mobile BroadBand eMBB
  • massive Machine Type Communication mMTC
  • Ultra Reliability Low Latency Communication URLLC
  • the eMBB may aim to provide a data transfer rate that is more improved than the data transfer rate supported by the existing LTE, LTE-A, or LTE-Pro.
  • the eMBB should be able to provide a maximum data rate of 20 Gbps in the downlink and a maximum data rate of 10 Gbps in the uplink from the viewpoint of one base station.
  • the 5G communication system may have to provide the maximum transmission speed and at the same time provide the increased user perceived data rate of the terminal.
  • the 5G communication system may require improvement of various transmission/reception technologies, including a more advanced multi-antenna (MIMO) transmission technology.
  • MIMO multi-antenna
  • the 5G communication system uses a frequency bandwidth wider than 20 MHz in the frequency band of 3 to 6 GHz or 6 GHz or more. Data transfer speed can be satisfied.
  • mMTC is being considered to support application services such as the Internet of Things (IoT) in the 5G communication system.
  • IoT Internet of Things
  • mMTC may require large-scale terminal access support, improved terminal coverage, improved battery life, and reduced terminal cost in a cell. Since the Internet of Things is attached to various sensors and various devices to provide communication functions, it must be able to support a large number of terminals (eg, 1,000,000 terminals/km2) within a cell.
  • a terminal supporting mMTC is highly likely to be located in a shaded area that a cell cannot cover, such as the basement of a building, due to the characteristics of the service, wider coverage may be required compared to other services provided by the 5G communication system.
  • a terminal supporting mMTC should be composed of a low-cost terminal, and since it is difficult to frequently exchange the battery of the terminal, a very long battery life time such as 10 to 15 years may be required.
  • URLLC as a cellular-based wireless communication service used for a specific purpose (mission-critical), remote control for a robot or machine, industrial automation, It may be used for a service used in an unmanned aerial vehicle, remote health care, emergency alert, and the like. Therefore, the communication provided by URLLC may have to provide very low latency (ultra-low latency) and very high reliability (ultra-reliability). For example, a service supporting URLLC must satisfy an air interface latency of less than 0.5 milliseconds, and at the same time may have a requirement of a packet error rate of 10-5 or less.
  • the 5G system must provide a smaller Transmit Time Interval (TTI) than other services, and at the same time, it is a design that requires a wide resource allocation in a frequency band to secure the reliability of the communication link. items may be required.
  • TTI Transmit Time Interval
  • the three services considered in the above-described 5G communication system ie, eMBB, URLLC, and mMTC, may be multiplexed and transmitted in one system.
  • different transmission/reception techniques and transmission/reception parameters may be used between services to satisfy different requirements of each service.
  • the aforementioned mMTC, URLLC, and eMBB are only examples of different service types, and the service types to which the present disclosure is applied are not limited to the above-described examples.
  • the embodiment of the present invention will be described below by taking the LTE, LTE-A, LTE Pro or 5G (or NR, next-generation mobile communication) system as an example, but the present invention is also applied to other communication systems having a similar technical background or channel type. An embodiment of can be applied. In addition, the embodiments of the present invention may be applied to other communication systems through some modifications within the scope of the present invention as judged by a person having skilled technical knowledge.
  • the present disclosure relates to a next-generation wireless communication system, and in particular, to provide a method and apparatus for reporting random access information.
  • the present disclosure relates to the operation of a terminal and a base station in a wireless communication system, and in particular, to provide a method and apparatus for reporting random access information in two steps in a mobile communication system.
  • eNB in LTE corresponds to gNB in NR
  • MME in LTE corresponds to AMF in NR.
  • FIG. 1A is a diagram illustrating a structure of a next-generation mobile communication system according to an embodiment of the present disclosure.
  • the radio access network of a next-generation mobile communication system includes a next-generation base station (New Radio Node B, hereinafter gNB) (1a-10) and an Access Management Function (AMF) (1a).
  • gNB Next-generation base station
  • AMF Access Management Function
  • -05 New Radio Core Network
  • a user terminal (New Radio User Equipment, hereinafter NR UE or terminal) 1a-15 may access an external network through gNB 1a-10 and AMF 1a-05.
  • gNBs 1a-10 may correspond to an Evolved Node B (eNB) of an existing LTE system.
  • the gNB (1a-10) may be connected to the NR UE (1a-15) through a radio channel, and (1a-20) may provide a service superior to that of the existing Node B.
  • eNB Evolved Node B
  • 1a-20 may provide a service superior to that of the existing Node B.
  • a device for scheduling by collecting status information such as buffer status, available transmission power status, and channel status of UEs is required, and 1a-10) may be in charge.
  • One gNB 1a-10 may control a plurality of cells.
  • the next-generation mobile communication system can have more than the existing maximum bandwidth to transmit data at a higher speed than the existing LTE system, and can use Orthogonal Frequency Division Multiplexing (hereinafter referred to as OFDM) as a radio access technology.
  • OFDM Orthogonal Frequency Division Multiplexing
  • beamforming technology may be grafted.
  • the next-generation mobile communication system may apply an Adaptive Modulation & Coding (AMC) method that determines a modulation scheme and a channel coding rate according to the channel state of the terminal.
  • AMC Adaptive Modulation & Coding
  • the AMF 1a-05 may perform functions such as mobility support, bearer setup, QoS setup, and the like.
  • the AMF 1a-05 may refer to a device in charge of various control functions as well as a mobility management function for the terminal, and may be connected to a plurality of base stations.
  • the next-generation mobile communication system may be linked to the existing LTE system, and the AMF 1a-05 may be connected to a mobility management entity (MME) 1a-25 through a network interface.
  • MME mobility management entity
  • the MME 1a-25 may be connected to the eNB 1a-30, which is an existing base station.
  • a UE supporting LTE-NR Dual Connectivity may transmit/receive data while maintaining a connection to not only the gNB (1a-10) but also the eNB (1a-30) (1a-35).
  • 1B is a diagram for explaining a random access process according to an embodiment of the present disclosure.
  • Random access may be performed when uplink synchronization is achieved or data is transmitted over a network. Random access according to an embodiment may be performed when switching from standby mode to connected mode, performing RRC re-establishment, performing handover, starting uplink data transmission, or starting downlink data reception.
  • the terminal 1b-05 may transmit the preamble by applying the preamble. Otherwise, the terminal 1b-05 may select one of the two preamble groups and select a preamble belonging to the selected group.
  • the two preamble groups described above are referred to as group A and group B, respectively.
  • the terminal 1b-05 may select a preamble belonging to group B. Otherwise, the terminal 1b-05 may select a preamble belonging to group A. If the selected preamble is transmitted in the nth subframe (1b-15), the terminal 1b-05 starts a random access response (RAR) window from the n+3rd subframe, and the RAR window time It is possible to monitor whether a random access response (hereinafter, RAR) is transmitted within the interval (1b-20).
  • the scheduling information of the RAR may be indicated by a Random Access Radio Network Temporary Identifier (RA-RNTI) of a Physical Downlink Control Channel (PDCCH).
  • RA-RNTI Random Access Radio Network Temporary Identifier
  • the RA-RNTI may be derived using a radio resource location on the time and frequency axes used to transmit the preamble.
  • the RAR may include a Timing Advance Command, a UL grant, and a temporary C-RNTI. If the RAR is successfully received in the RAR window, the terminal 1b-05 may transmit msg3 using information on the UL grant included in the RAR (1b-25). Msg3 may include other information according to the purpose of random access.
  • [Table 1] is an example of information contained in msg 3.
  • Msg3 may be transmitted in the n+6th subframe. From Msg3, Hybrid Automatic Repeat reQuest (HARQ) may be applied. After transmitting Msg3, the terminal 1b-05 may drive a specific timer and monitor the Contention Resolution (CR) message (Msg4) until the timer expires (1b-30).
  • the CR message may include an RRC Connection Setup or RRC Connection Reestablishment message according to a random access purpose in addition to a CR MAC Control Element (MAC CE).
  • 1C is a flowchart of a two-step random access process according to an embodiment of the present disclosure.
  • a terminal may perform a random access process consisting of two steps with a base station.
  • the two-step random access process consists of a step (1c-15) in which the terminal 1c-05 transmits msgA in the uplink and a step (1c-20) in which the base station 1c-10 transmits msgB in the downlink.
  • can msgA according to an embodiment may include contents of msg1 (ie, preamble) and msg3 used in the conventional random access process (ie, described above with reference to FIG. 1B), and scheduling information of msgB.
  • msgB may include contents of msg2 (ie, RAR) and msg4 in the conventional random access process (ie, described above in FIG. 1B ).
  • Information (or content) stored in the conventional msg3 has been described above in [Table 1]. Since the information contained in msg3 may be different according to the purpose of the random access, the information contained in msgA will be different according to the purpose of performing the two-step random access according to the embodiment of the present disclosure.
  • the information contained in the conventional msg2 may consist of a random access preamble identifier (RAPID, RA preamble identifier), a Timing Advance (TA) command, a UL grant, and a temporary C-RNTI.
  • RAPID random access preamble identifier
  • TA Timing Advance
  • the two-step random access process according to an embodiment of the present disclosure may be switched to the four-step random access process described in FIG. 1B .
  • the predetermined condition is a message indicating that the signal strength (RSRP, Reference Signal Received Power) of the reference signal transmitted by the base station does not satisfy a predetermined RSRP threshold or a message instructing to switch to 4-step random access from the network ( For example, when a fallbackRAR) is received.
  • a predetermined RSRP threshold may be provided to the terminal through system information broadcast by the network.
  • System information according to an embodiment may be stored in a master information block (MIB) or system information block 1 (SIB1) that is always periodically broadcast.
  • MIB master information block
  • SIB1 system information block 1
  • the present disclosure is characterized in that the terminal collects and reports predetermined information related to two-step random access.
  • the details of the present disclosure are described based on the LTE system, the technology of the present disclosure is also applicable to the NR system.
  • eNB may correspond to gNB and MME may correspond to AMF.
  • 1D is a conceptual diagram of a process of reporting a two-step random access according to an embodiment of the present disclosure.
  • the base station may provide configuration information related to the 2-step RA to the terminal through system information or dedicated signaling (1d-05).
  • the UE may select either 4-step RA or 2-step RA through a random access resource selection process when random access is required for a predetermined purpose (1d-10 ).
  • the UE may transmit MSGA (ie, msgA) to the base station (1d-15).
  • the terminal that has transmitted the MSGA may trigger a predetermined time period (eg, msgB-ResponseWindow time period) (1d-30) after a set time elapses (1d-20).
  • the terminal may attempt to receive the MSGB (ie, msgB) (1d-35) for a predetermined time period.
  • the UE may monitor the C-RNTI on the PDCCH during the predetermined time period.
  • the C-RNTI MAC CE may monitor the MSGB-RNTI (1d-25).
  • the C-RNTI MAC CE may be included in the MSGA when the random access is triggered for the purpose of beam failure recovery (BFR), UL grant request according to SR (Scheduling Request) failure, or UL timing advance purpose.
  • BFR beam failure recovery
  • SR Service Request
  • the UE may consider that the contention resolution for the random access has been successful and completed.
  • the UE may trigger the transmission of MSG3 (1d-40).
  • the UE may increase the value of PREAMBLE_TRANSMISSION_COUNTER by 1 (1d). -45).
  • the UE may indicate to a higher layer that the random access has failed.
  • the UE may switch to a 4-step RA and retry random access. After a predetermined backoff time has elapsed, the terminal may restart the random access process from the random access resource selection process.
  • preambleTransMax may mean the maximum number of times that the UE can transmit the preamble, and may be a preset value.
  • msgA-TransMax may mean the maximum number of times that the UE can transmit MSGA, and may be a preset value.
  • FIG. 1E is a flowchart of a process of performing a random access channel (RACH) report according to an embodiment of the present disclosure.
  • RACH random access channel
  • 2-step RA was introduced in Rel-16, which stipulates the communication technology related to the next-generation mobile communication system NR, according to the RA Report method specified in Rel-16, the terminal can only record and report information related to 4-step RA. have. However, in the RA Report method according to Rel-17, not only information related to 4-step RA, but also information related to 2-step RA can be recorded and reported.
  • the terminal 1e-05 may perform a random access procedure to the base station 1e-10.
  • the terminal 1e-05 may store predetermined information related to the most recently successfully performed random access process (1e-15). Thereafter, when another random access process is performed and successfully completed, the terminal 1e-05 may delete previously stored information and store predetermined information related to the new random access process.
  • the terminal 1e-05 according to an embodiment of the present disclosure does not store related information by limiting to the most recently successfully performed random access procedure, but rather the recent random access procedures performed for a predetermined time or the recent Information may be stored in consideration of all N random access processes.
  • the terminal 1e-05 may consider all recent random access processes within a range that does not exceed a predetermined terminal memory, and may store information related to recent random access processes.
  • the terminal 1e-05 may store information related to the failed random access process in addition to the successful random access process. For example, when the random access process is related to the 4-step random access, the terminal 1e-05 may store the following information.
  • NCGI NR Cell Global Identifier
  • PCI Physical Cell ID
  • the purpose for which the random access was performed for example, the purpose of access, the purpose of beam failure recovery, the purpose of handover, the purpose of uplink synchronization, etc.
  • SSB synchronization signal block
  • CSI-RS index value for which random access was attempted and the number of times the preamble was transmitted in the SSB or CSI-RS
  • Msg1 transmission related information for example, the frequency start time used for msg1 transmission, subcarrier spacing information used for msg1 transmission, FDM (Frequency Division Multiplexing) information used for msg1 transmission
  • the above-described information may be stored in the terminal according to the ASN.1 structure described in [Table 2] below, and may be reported to the base station.
  • One successfully completed random access process may be stored and reported in the RA-Report IE, and a maximum of 8 RA reports may be accommodated in the RA-ReportList IE.
  • One RA-Report IE may contain information on a plurality of random access attempts in chronological order (Per-RAInfoList IE).
  • the above-mentioned information may be accommodated in the PerRAInfo IE stored in the Per-RAInfoList for each SSB or CSI-RS used in the random access attempt.
  • PerRAAttemptInfo IE PerRAAttemptInfoList.
  • the terminal 1e-05 may store the following predetermined information together with the above-described Per-RAInfoList information.
  • MsgA transmission related information for example, frequency start time used for msgA transmission, subcarrier spacing information used for msgA transmission, FDM information used for msgA transmission
  • the indicator indicating whether the fallbackRAR has been received is stored for each PerRAAttemptInfo IE, and to reduce signaling overhead, it may be stored for each PerRAInfo IE, RA-Report IE, or RA-InformationCommon IE.
  • MSGA Physical Uplink Shared Channel (MSGA PUSCH) is transmitted in each random access attempt. For example, in NR-U, when LBT failure occurs in the PUSCH occasion part of the MSGA corresponding to the SSB / PRACH occasion selected for random access, or the PUSCH of the MSGA corresponding to the SSB / PRACH occasion selected for random access. If the occasion is not valid, MSGA PUSCH may not be transmitted.
  • the indicator indicating whether the MSGA PUSCH has been transmitted is stored for each PerRAAttemptInfo IE, and to reduce signaling overhead, it may be stored for each PerRAInfo IE, RA-Report IE, or RA-InformationCommon IE.
  • An indicator indicating that the (most recently successfully) performed random access process is a two-step random access process
  • NUL Normal Uplink
  • SUL Supplemental Uplink
  • the contentionDetected indicator that can be accommodated for each PerRAAttemptInfo can be accommodated only when one of the following options is satisfied.
  • the terminal 1e-05 in the standby mode or inactive mode transmits an RRCSetupRequest message or an RRCResumeRequest message to the base station 1e-10 to switch to the connected mode (1e-20).
  • the base station 1e-10 may transmit an RRCSetup message or an RRCResume message to the terminal 1e-05 (1e-25), and the terminal 1e-05 receiving the RRCSetup message or the RRCResume message may switch to the connected mode. have.
  • an RRCSetupComplete message or RRCResumeComplete including an availability indicator indicating random access-related information stored by the terminal 1e-05
  • the message may be transmitted to the base station 1e-10 (1e-30).
  • the availability indicator may indicate an RA Report according to Rel-16 that can report only 4-step RA-related information and an RA Report according to Rel-17 that can report both 2-/4-step RA-related information.
  • the UE supporting both the RA Report according to Rel-16 and the RA Report according to Rel-17 may perform both of the above-described two RA Report operations.
  • the base station 1e-10 may request the terminal 1e-05 to report information stored by the terminal 1e-05 using a predetermined RRC message (1e- 35).
  • the terminal 1e-05 may transmit RA Report information to the base station 1e-10.
  • the terminal 1e-05 may transmit a predetermined response RRC message including information stored by the terminal 1e-05 to the base station 1e-10 (1e-40).
  • the terminal 1e-05 may delete RA Report information reported to the base station 1e-10.
  • the terminal 1e-05 may delete the stored RA Report information after a specific time elapses even if the stored RA Report is not reported to the base station.
  • 1F is a diagram illustrating a method of reporting a two-step/four-step random access according to an embodiment of the present disclosure.
  • the terminal operation constituting the RA Report may be classified into several cases.
  • Case 1 of [Table 3] is a case in which the UE attempts only two-step RA at least once, succeeds in random access, and stores related information.
  • Case 2 of [Table 3] is a case in which the UE attempts only 2-step RA more than once, and the random access ultimately fails.
  • the RA Report may refer to a technique in which the UE records and reports information on successfully completed random access. Therefore, in case 2, the UE will not need to report information in the RA Report.
  • the UE uses a common RA Report list (1f-20) or a separate RA Report list (1f-25) for each RA type, and information related to the above-mentioned 2-step RA and/or 4-
  • a method of storing and reporting information related to step RA may be disclosed.
  • RA-ReportList-r17 which is a novel IE accommodating up to x number of RA-Report-r17, may be provided.
  • each RA-Report-r17 includes only 4-step RA-related information
  • each RA-Report-r17 is in Case 1 or Case 3 described above. Corresponding information may be included.
  • the RA Report including only 4-step RA-related information may be separately reported to the base station using the RA Report mechanism specified in Rel-16.
  • the following information may be additionally included in the RA-Report-r17 IE including the information according to Case 3 above.
  • the ASN.1 structure may be 2SRA-r17 ENUMERATED ⁇ true ⁇ OPTIONAL, or RAType ENUMERATED ⁇ 2S, 4S ⁇ .
  • an indicator indicating that the 2-step RA is switched to the 4-step RA may be added to the corresponding indicator as the cause of the transition.
  • 2-step RA or 4-step RA related information may be stored in different PerRAInfos to distinguish 2-step RA or 4-step RA related information.
  • one indicator indicating the transition may be included in PerRAInfo corresponding to 2-step RA.
  • the information is only one piece of information if the RA Report includes only 4-step RA-related information. It can be saved in the RA Report list.
  • the conventional RA-ReportList-r16 may be reused for the RA report list including only 4-step RA-related information.
  • Another RA Report list may store 2-step RA information in Case 1 and 2-step RA information and 4-step RA information in Case 3 above.
  • an indicator capable of distinguishing RA types may be included as in the case of using the common RA Report list.
  • all RA-related information may be stored in two RA report lists.
  • the UE stores the 2-step RA related information in the RA-Report IE belonging to one RA Report list, and after switching from the 2-step RA to the 4-step RA, the 4-step RA related information It can be stored in RA-Report IE belonging to another RA Report list.
  • an indicator indicating that the 2-step RA has been switched to the 4-step RA may be stored in the RA-Report IE containing the 2-step RA related information.
  • a separate RA-InformationCommon for each RA type or a separate perRAInfoList for each RA type may be proposed.
  • 1G is a flowchart of an operation of a UE reporting stage 2/4 stage random access according to an embodiment of the present disclosure.
  • random access ie, 2-step
  • the random access procedure that is, the random access procedure configured in two steps in the present disclosure
  • MsgA and MsgB RA the random access procedure configured in two steps in the present disclosure
  • Msg1, Msg2, Msg3 and Msg4 ie, a random access procedure consisting of 4 steps in the present disclosure
  • the terminal may receive system information from the base station.
  • System information may include configuration parameters necessary for performing 2-step RA.
  • the UE may trigger random access according to a predetermined purpose.
  • step 1g-15 the UE determines whether 2-step RA-related configuration parameters have been configured from the base station and whether 2-step RA has been performed for random access.
  • the UE may perform the RA Report operation according to Rel-16 in step 1g-20. That is, the UE may collect successfully completed 4-step RA related information.
  • the UE may perform the Rel-17 RA Report operation according to the present disclosure in steps 1g-25. That is, the UE may collect successfully completed 2-step RA related information and 4-step RA related information.
  • the terminal may store the collected RA-related information.
  • step 1g-35 the terminal may be switched to the connected mode.
  • the terminal may report an RRCSetupComplete (or RRCResumeComplete) message including an indicator indicating that the terminal stores RA Report information to the base station.
  • RRCSetupComplete or RRCResumeComplete
  • the UE may receive a UEInformationRequest message including information requesting a report of the stored RA Report information from the base station.
  • the UE may transmit the UEInformatioResponse message including the RA Report information stored therein to the base station.
  • 1H is a block diagram illustrating a structure of a terminal in a wireless communication system according to the present disclosure.
  • the terminal may include a radio frequency (RF) processing unit 1h-10, a baseband processing unit 1h-20, a storage unit 1h-30, and a control unit 1h-40. have.
  • RF radio frequency
  • the terminal may include fewer or more configurations than the configuration shown in FIG. 1H .
  • the RF processing unit 1h-10 may perform a function for transmitting and receiving a signal through a wireless channel, such as band conversion and amplification of the signal. That is, the RF processing unit 1h-10 may up-convert the baseband signal provided from the baseband processing unit 1h-20 into an RF band signal and then transmit it through the antenna, and receive the RF band signal through the antenna. can be down-converted to a baseband signal.
  • the RF processing unit 1h-10 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. have. Of course, it is not limited to the above-described example. Although only one antenna is shown in FIG.
  • the terminal may include a plurality of antennas.
  • the RF processing unit 1h-10 may include a plurality of RF chains.
  • the RF processing unit 1h-10 may perform beamforming. In order to perform beamforming, the RF processing unit 1h-10 may adjust the phase and magnitude of each of signals transmitted and received through a plurality of antennas or antenna elements.
  • the RF processing unit 1h-10 may perform MIMO, and may receive multiple layers when performing MIMO operation.
  • the baseband processing unit 1h-20 may perform a function of converting a baseband signal and a bit stream according to a physical layer standard of the system. For example, when transmitting data, the baseband processing unit 1h-20 may generate complex symbols by encoding and modulating the transmitted bit stream. Also, upon data reception, the baseband processing unit 1h-20 may restore the received bit stream by demodulating and decoding the baseband signal provided from the RF processing unit 1h-10. For example, in the case of orthogonal frequency division multiplexing (OFDM), when transmitting data, the baseband processing unit 1h-20 encodes and modulates a transmitted bit stream to generate complex symbols, and maps the complex symbols to subcarriers.
  • OFDM orthogonal frequency division multiplexing
  • OFDM symbols can be configured through inverse fast Fourier transform (IFFT) operation and cyclic prefix (CP) insertion.
  • IFFT inverse fast Fourier transform
  • CP cyclic prefix
  • the baseband processing unit 1h-20 divides the baseband signal provided from the RF processing unit 1h-10 into OFDM symbol units, and is mapped to subcarriers through a fast Fourier transform (FFT) operation. After reconstructing the signals, the received bit stream may be reconstructed through demodulation and decoding.
  • FFT fast Fourier transform
  • the baseband processing unit 1h-20 and the RF processing unit 1h-10 may transmit and receive signals as described above. Accordingly, the baseband processing unit 1h-20 and the RF processing unit 1h-10 may be referred to as a transmitter, a receiver, a transceiver, or a communication unit. Furthermore, at least one of the baseband processing unit 1h-20 and the RF processing unit 1h-10 may include a plurality of communication modules to support a plurality of different wireless access technologies. In addition, at least one of the baseband processing unit 1h-20 and the RF processing unit 1h-10 may include different communication modules to process signals of different frequency bands.
  • the different wireless access technologies may include a wireless LAN (eg, IEEE 802.11), a cellular network (eg, LTE), and the like.
  • the different frequency bands may include a super high frequency (SHF) (eg, 2.NRHz, NRhz) band and a millimeter wave (eg, 60GHz) band.
  • SHF super high frequency
  • the terminal may transmit/receive a signal to and from the base station using the baseband processing unit 1h-20 and the RF processing unit 1h-10, and the signal may include control information and data.
  • the storage unit 1h-30 may store data such as a basic program, an application program, and setting information for the operation of the terminal.
  • the storage unit 1h-30 may store data such as a basic program, an application program, and setting information for the above-described operation of the terminal.
  • the storage unit 1h-30 may provide stored data according to the request of the control unit 1h-40.
  • the storage unit 1h-30 may be configured of a storage medium such as a ROM, a RAM, a hard disk, a CD-ROM, and a DVD, or a combination of storage media. Also, the storage unit 1h-30 may include a plurality of memories. According to an embodiment of the present disclosure, the storage unit 1h-30 may store a program for performing the method of storing and reporting random access information according to the present disclosure.
  • the controller 1h-40 may control overall operations of the terminal.
  • the control unit 1h-40 may transmit/receive signals through the baseband processing unit 1h-20 and the RF processing unit 1h-10.
  • the control unit 1h-40 may write and read data in the storage unit 1h-40.
  • the controller 1h-40 may include at least one processor.
  • the controller 1h-40 may include a communication processor (CP) that controls for communication and an application processor (AP) that controls an upper layer such as an application program.
  • CP communication processor
  • AP application processor
  • the controller 1h-40 may include a multi-connection processing unit 1h-42 configured to process a process operating in a multi-connection mode.
  • at least one component in the terminal may be implemented as one chip.
  • 1I is a block diagram illustrating a structure of a base station in a wireless communication system according to the present disclosure.
  • the base station includes an RF processing unit 1i-10, a baseband processing unit 1i-20, a backhaul communication unit 1i-30, a storage unit 1i-40, and a control unit 1i-50. consists of including Of course, the example is not limited thereto, and the base station may include fewer or more configurations than those illustrated in FIG. 1I .
  • the RF processing unit 1i-10 may perform a function for transmitting and receiving a signal through a wireless channel, such as band conversion and amplification of the signal. That is, the RF processing unit 1i-10 up-converts the baseband signal provided from the baseband processing unit 1i-20 into an RF band signal, transmits it through an antenna, and converts the RF band signal received through the antenna to the base. It can be downconverted to a band signal.
  • the RF processing unit 1i-10 may include a transmit filter, a receive filter, an amplifier, a mixer, an oscillator, a DAC, an ADC, and the like. In FIG. 1I, only one antenna is shown, but the base station may include a plurality of antennas.
  • the RF processing unit 1i-10 may include a plurality of RF chains. Furthermore, the RF processing unit 1i-10 may perform beamforming. In order to perform the beamforming, the RF processing unit 1i-10 may adjust the phase and magnitude of each of signals transmitted and received through a plurality of antennas or antenna elements. The RF processing unit 1i-10 may perform a downlink MIMO operation by transmitting one or more layers.
  • the baseband processing unit 1i-20 may perform a function of converting a baseband signal and a bit stream according to a physical layer standard. For example, when transmitting data, the baseband processing unit 1i-20 may generate complex symbols by encoding and modulating the transmitted bit stream. Also, upon data reception, the baseband processing unit 1i-20 may restore the received bit stream by demodulating and decoding the baseband signal provided from the RF processing unit 1i-10. For example, in the OFDM scheme, when data is transmitted, the baseband processing unit 1i-20 generates complex symbols by encoding and modulating the transmitted bit stream, maps the complex symbols to subcarriers, and performs an IFFT operation. And OFDM symbols can be configured through CP insertion.
  • the baseband processing unit 1i-20 divides the baseband signal provided from the RF processing unit 1i-10 into OFDM symbol units, and restores signals mapped to subcarriers through FFT operation. , it is possible to restore the received bit stream through demodulation and decoding.
  • the baseband processing unit 1i-20 and the RF processing unit 1i-10 may transmit and receive signals as described above. Accordingly, the baseband processing unit 1i-20 and the RF processing unit 1i-10 may be referred to as a transmitter, a receiver, a transceiver, a communication unit, or a wireless communication unit.
  • the base station may transmit/receive a signal to and from the terminal using the baseband processing unit 1i-20 and the RF processing unit 1i-10, and the signal may include control information and data.
  • the backhaul communication unit 1i-30 may provide an interface for performing communication with other nodes in the network. That is, the backhaul communication unit 1i-30 converts a bit string transmitted from a base station to another node, for example, an auxiliary base station, a core network, etc. into a physical signal, and converts a physical signal received from the other node into a bit string can do.
  • the storage unit 1i-40 may store data such as a basic program, an application program, and setting information for the operation of the base station.
  • the storage unit 1i-40 may store information on a bearer allocated to an accessed terminal, a measurement result reported from the accessed terminal, and the like.
  • the storage unit 1i-40 may store information serving as a criterion for determining whether to provide or stop multiple connections to the terminal.
  • the storage unit 1i-40 provides the stored data according to the request of the control unit 1i-50.
  • the storage unit 1i-40 may be configured of a storage medium such as a ROM, a RAM, a hard disk, a CD-ROM, and a DVD, or a combination of storage media.
  • the storage unit 1i-40 may include a plurality of memories. According to an embodiment of the present disclosure, the storage unit 1i-40 may store a program for performing a method for receiving random access information from a terminal according to the present disclosure.
  • the controller 1i-50 may control overall operations of the base station. For example, the control unit 1i-50 may transmit/receive a signal through the baseband processing unit 1i-20 and the RF processing unit 1i-10 or through the backhaul communication unit 1i-30. Also, the controller 1i-50 may write and read data to and from the storage unit 1i-40. To this end, the control unit 1i-50 may include at least one processor.
  • the controller 1i-50 may include a multi-connection processing unit 1i-52 configured to process a process operating in a multi-connection mode.
  • a computer-readable storage medium storing one or more programs (software modules) may be provided.
  • One or more programs stored in the computer-readable storage medium are configured to be executable by one or more processors in an electronic device (device).
  • One or more programs include instructions for causing an electronic device to execute methods according to embodiments described in a claim or specification of the present disclosure.
  • Such programs include random access memory, non-volatile memory including flash memory, read only memory (ROM), electrically erasable programmable ROM (EEPROM: Electrically Erasable Programmable Read Only Memory), magnetic disc storage device, Compact Disc-ROM (CD-ROM), Digital Versatile Discs (DVDs), or any other form of It may be stored in an optical storage device or a magnetic cassette. Alternatively, it may be stored in a memory composed of a combination of some or all thereof. In addition, a plurality of each configuration memory may be included.
  • the program is transmitted through a communication network consisting of a communication network such as the Internet, Intranet, Local Area Network (LAN), Wide LAN (WLAN), or Storage Area Network (SAN), or a combination thereof. It may be stored on an attachable storage device that can be accessed. Such a storage device may be connected to a device implementing an embodiment of the present disclosure through an external port. In addition, a separate storage device on the communication network may be connected to the device implementing the embodiment of the present disclosure.
  • a communication network such as the Internet, Intranet, Local Area Network (LAN), Wide LAN (WLAN), or Storage Area Network (SAN), or a combination thereof. It may be stored on an attachable storage device that can be accessed.
  • Such a storage device may be connected to a device implementing an embodiment of the present disclosure through an external port.
  • a separate storage device on the communication network may be connected to the device implementing the embodiment of the present disclosure.

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  • Engineering & Computer Science (AREA)
  • Computer Networks & Wireless Communication (AREA)
  • Signal Processing (AREA)
  • Mobile Radio Communication Systems (AREA)

Abstract

Un procédé de fonctionnement d'un terminal dans un système de communication sans fil selon un mode de réalisation de la présente divulgation peut comprendre les étapes consistant à : stocker un résultat d'accès aléatoire d'au moins l'un d'un accès aléatoire en 2 étapes et d'un accès aléatoire en 4 étapes ; recevoir une demande pour rapporter le résultat d'accès aléatoire à partir d'une station de base ; et, sur la base de la demande de rapport, transmettre un message RRC comprenant au moins un élément d'informations de rapport d'accès aléatoire à la station de base, les informations de rapport d'accès aléatoire comprenant au moins l'une des informations relatives à l'accès aléatoire en 2 étapes et des informations relatives à l'accès aléatoire en 4 étapes.
PCT/KR2022/000750 2021-01-14 2022-01-14 Procédé et dispositif de rapport d'informations d'accès aléatoire dans un système de communication sans fil WO2022154585A1 (fr)

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