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WO2020206768A1 - Contenu de message b de rach à deux étapes - Google Patents

Contenu de message b de rach à deux étapes Download PDF

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Publication number
WO2020206768A1
WO2020206768A1 PCT/CN2019/085126 CN2019085126W WO2020206768A1 WO 2020206768 A1 WO2020206768 A1 WO 2020206768A1 CN 2019085126 W CN2019085126 W CN 2019085126W WO 2020206768 A1 WO2020206768 A1 WO 2020206768A1
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WO
WIPO (PCT)
Prior art keywords
random access
payload
message
access response
mac
Prior art date
Legal status (The legal status 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 status listed.)
Ceased
Application number
PCT/CN2019/085126
Other languages
English (en)
Inventor
Ruiming Zheng
Linhai He
Jing LEI
Chao Wei
Xiaoxia Zhang
Ozcan Ozturk
Gavin Bernard Horn
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Qualcomm Inc
Original Assignee
Qualcomm Inc
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.)
Filing date
Publication date
Application filed by Qualcomm Inc filed Critical Qualcomm Inc
Priority to PCT/CN2020/083627 priority Critical patent/WO2020207392A1/fr
Priority to US17/593,522 priority patent/US12284690B2/en
Priority to CN202510959701.6A priority patent/CN120640427A/zh
Priority to EP20788422.2A priority patent/EP3954173A4/fr
Priority to CN202080025180.2A priority patent/CN113647191B/zh
Priority to SG11202109913Q priority patent/SG11202109913QA/en
Priority to KR1020217031806A priority patent/KR20210148164A/ko
Publication of WO2020206768A1 publication Critical patent/WO2020206768A1/fr
Anticipated expiration legal-status Critical
Priority to US19/093,400 priority patent/US20250227777A1/en
Ceased legal-status Critical Current

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Classifications

    • 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
    • H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
    • H04L5/00—Arrangements affording multiple use of the transmission path
    • H04L5/003—Arrangements for allocating sub-channels of the transmission path
    • H04L5/0053—Allocation of signalling, i.e. of overhead other than pilot signals
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
    • H04L5/00—Arrangements affording multiple use of the transmission path
    • H04L5/003—Arrangements for allocating sub-channels of the transmission path
    • H04L5/0053—Allocation of signalling, i.e. of overhead other than pilot signals
    • H04L5/0055—Physical resource allocation for ACK/NACK
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04W—WIRELESS COMMUNICATION NETWORKS
    • H04W74/00—Wireless channel access
    • H04W74/002—Transmission of channel access control information
    • H04W74/006—Transmission of channel access control information in the downlink, i.e. towards the terminal
    • 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
    • H04W74/0836—Random access procedures, e.g. with 4-step access with 2-step access

Definitions

  • aspects of the present disclosure generally relate to wireless communication, and more particularly to techniques and apparatuses for indication for two-step random access channel (RACH) fallback to four-step RACH.
  • RACH random access channel
  • Wireless communication systems are widely deployed to provide various telecommunication services such as telephony, video, data, messaging, and broadcasts.
  • Typical wireless communication systems may employ multiple-access technologies capable of supporting communication with multiple users by sharing available system resources (e.g., bandwidth, transmit power, and/or the like) .
  • multiple-access technologies include code division multiple access (CDMA) systems, time division multiple access (TDMA) systems, frequency-division multiple access (FDMA) systems, orthogonal frequency-division multiple access (OFDMA) systems, single-carrier frequency-division multiple access (SC-FDMA) systems, time division synchronous code division multiple access (TD-SCDMA) systems, and Long Term Evolution (LTE) .
  • LTE/LTE-Advanced is a set of enhancements to the Universal Mobile Telecommunications System (UMTS) mobile standard promulgated by the Third Generation Partnership Project (3GPP) .
  • UMTS Universal Mobile Telecommunications System
  • a wireless communication network may include a number of base stations (BSs) that can support communication for a number of user equipment (UEs) .
  • a UE may communicate with a BS via the downlink and uplink.
  • the downlink (or forward link) refers to the communication link from the BS to the UE
  • the uplink (or reverse link) refers to the communication link from the UE to the BS.
  • a BS may be referred to as a Node B, a gNB, an access point (AP) , a radio head, a transmit receive point (TRP) , a 5G BS, a 5G Node B, and/or the like.
  • 5G which may also be referred to as New Radio (NR)
  • NR New Radio
  • 3GPP Third Generation Partnership Project
  • 5G is designed to better support mobile broadband Internet access by improving spectral efficiency, lowering costs, improving services, making use of new spectrum, and better integrating with other open standards using OFDM with a cyclic prefix (CP) (CP-OFDM) on the downlink (DL) , using CP-OFDM and/or SC-FDM (e.g., also known as discrete Fourier transform spread OFDM (DFT-s-OFDM) ) on the uplink (UL) , as well as supporting beamforming, multiple-input multiple-output (MIMO) antenna technology, and carrier aggregation.
  • CP-OFDM OFDM with a cyclic prefix
  • SC-FDM e.g., also known as discrete Fourier transform spread OFDM (DFT-s-OFDM)
  • DFT-s-OFDM discrete Fourier transform spread OFDM
  • MIMO multiple-input multiple-output
  • a UE may perform a random access procedure (e.g., a random access channel (RACH) procedure, a physical RACH (PRACH) procedure, and/or the like) to access a network via a BS.
  • a random access procedure e.g., a random access channel (RACH) procedure, a physical RACH (PRACH) procedure, and/or the like
  • the UE may perform a four-step RACH procedure, which involves a first uplink random access message to provide a preamble of the UE (e.g., Message 1 or Msg1) , a second downlink random access response to the first uplink random access message (e.g., Message 2 or Msg2) , a third uplink random access message with a payload (e.g., Message 3 or Msg3) , and a fourth downlink random access message (e.g., Message 4 or Msg4) .
  • a first uplink random access message to provide a preamble of the
  • the UE may perform a two-step RACH procedure, wherein Message 1 and Message 3 are combined into a single uplink message (e.g., Message A or MsgA) and Message 2 and Message 4 are combined into a single downlink message (e.g., Message B or MsgB) .
  • a BS may successfully decode a preamble of a RACH message, and may fail to decode a payload of the RACH message (e.g., Message A) . In such a case, the UE may fall back to a four-step RACH approach, or may reattempt the random access. In other cases, a BS may successfully decode the payload and the preamble.
  • the RACH procedure may continue uninterrupted. It may be useful to provide a messaging system whereby the BS can signal a result of decoding the RACH message (e.g., preamble and payload successfully decoded, preamble successfully decoded and payload unsuccessfully decoded, preamble and payload unsuccessfully decoded, and/or the like) and an action to be performed by the UE (e.g., fallback to a four-step RACH procedure, reattempt a two-step RACH procedure or a four-step RACH procedure, retransmit a payload of the RACH message, and/or the like) .
  • a result of decoding the RACH message e.g., preamble and payload successfully decoded, preamble successfully decoded and payload unsuccessfully decoded, preamble and payload unsuccessfully decoded, and/or the like
  • an action to be performed by the UE e.g., fallback to a four-step RACH procedure, reatt
  • Some techniques and apparatuses described herein provide an indication of a result of decoding a two-step RACH message and an action to be performed by the UE. For example, some techniques and apparatuses described herein may provide the indication using a UE contention resolution identity-based approach, wherein the contention resolution identity of the UE may be provided in a random access response. Some techniques and apparatuses described herein may use a fallback indicator that indicates the result of decoding and/or the action to be performed. Some techniques and apparatuses described herein may use a random access response (RAR) subheader that selectively omits a random access preamble identifier based at least in part on the result of decoding and/or the action to be performed.
  • RAR random access response
  • the BS may signal, to the UE, a result of decoding and/or an action to be performed.
  • the UE may perform the action (e.g., falling back to the four-step RACH procedure, reattempting RACH, and/or the like) in accordance with the indication.
  • the granularity of actions to be signaled in connection with a two-step RACH procedure may be improved, thereby improving network performance and increasing reliability of the two-step RACH procedure.
  • a method, a user equipment (UE) , a base station, an apparatus, and a computer program product are provided.
  • a method of wireless communication may include attempting a random access by transmitting a random access message associated with a two-step random access procedure; receiving an indication that indicates that a preamble of the random access message and a payload of the random access message were successfully decoded, or that the payload was not successfully decoded; and selectively: completing the two-step random access procedure when the indication indicates that the preamble of the random access message and the payload of the random access message were successfully decoded, or reattempting the random access or performing a fallback to a four-step random access procedure when the indication indicates that the payload was not successfully decoded.
  • the UE may include a memory and one or more processors operatively coupled to the memory.
  • the memory and the one or more processors may be configured to attempt a random access by transmit a random access message associated with a two-step random access procedure; receive an indication that indicates that a preamble of the random access message and a payload of the random access message were successfully decoded, or that the payload was not successfully decoded; and selectively: complete the two-step random access procedure when the indication indicates that the preamble of the random access message and the payload of the random access message were successfully decoded, or reattempt the random access or perform a fallback to a four-step random access procedure when the indication indicates that the payload was not successfully decoded.
  • the apparatus may include means for attempting a random access by transmitting a random access message associated with a two-step random access procedure; means for receiving an indication that indicates that a preamble of the random access message and a payload of the random access message were successfully decoded, or that the payload was not successfully decoded; and means for selectively: completing the two-step random access procedure when the indication indicates that the preamble of the random access message and the payload of the random access message were successfully decoded, or reattempting the random access or performing a fallback to a four-step random access procedure when the indication indicates that the payload was not successfully decoded.
  • the computer program product may include a non-transitory computer-readable medium storing one or more instructions.
  • the one or more instructions when executed by one or more processors of a UE, may cause the one or more processors to attempt a random access by transmit a random access message associated with a two-step random access procedure; receive an indication that indicates that a preamble of the random access message and a payload of the random access message were successfully decoded, or that the payload was not successfully decoded; and selectively: complete the two-step random access procedure when the indication indicates that the preamble of the random access message and the payload of the random access message were successfully decoded, or reattempt the random access or perform a fallback to a four-step random access procedure when the indication indicates that the payload was not successfully decoded.
  • a method of wireless communication may include receiving, from a UE attempting random access, a random access message associated with a two-step random access procedure; transmitting an indication that indicates that a preamble of the random access message and a payload of the random access message were successfully decoded, or that the payload was not successfully decoded; and selectively: completing the two-step random access procedure when the indication indicates that the preamble of the random access message and the payload of the random access message were successfully decoded, or receiving messaging associated with the UE reattempting the random access or performing a fallback to a four-step random access procedure when the indication indicates that the payload was not successfully decoded.
  • the base station may include a memory and one or more processors operatively coupled to the memory.
  • the memory and the one or more processors may be configured to receive, from a UE attempting random access, a random access message associated with a two-step random access procedure; transmit an indication that indicates that a preamble of the random access message and a payload of the random access message were successfully decoded, or that the payload was not successfully decoded; and selectively: complete the two-step random access procedure when the indication indicates that the preamble of the random access message and the payload of the random access message were successfully decoded, or receive messaging associated with the UE reattempting the random access or performing a fallback to a four-step random access procedure when the indication indicates that the payload was not successfully decoded.
  • the apparatus may include means for receiving, from a UE attempting random access, a random access message associated with a two-step random access procedure; means for transmitting an indication that indicates that a preamble of the random access message and a payload of the random access message were successfully decoded, or that the payload was not successfully decoded; and means for selectively: completing the two-step random access procedure when the indication indicates that the preamble of the random access message and the payload of the random access message were successfully decoded, or receiving messaging associated with the UE reattempting the random access or performing a fallback to a four-step random access procedure when the indication indicates that the payload was not successfully decoded.
  • the computer program product may include a non-transitory computer-readable medium storing one or more instructions.
  • the one or more instructions when executed by one or more processors of a base station, may cause the one or more processors to receive, from a UE attempting random access, a random access message associated with a two-step random access procedure; transmit an indication that indicates that a preamble of the random access message and a payload of the random access message were successfully decoded, or that the payload was not successfully decoded; and selectively: complete the two-step random access procedure when the indication indicates that the preamble of the random access message and the payload of the random access message were successfully decoded, or receive messaging associated with the UE reattempting the random access or performing a fallback to a four-step random access procedure when the indication indicates that the payload was not successfully decoded.
  • aspects generally include a method, apparatus, system, computer program product, non-transitory computer-readable medium, user equipment, base station, wireless communication device, and processing system as substantially described herein with reference to and as illustrated by the accompanying drawings, specification, and appendix.
  • FIG. 1 is diagram illustrating an example of a wireless communication network.
  • FIG. 2 is a diagram illustrating an example of a base station in communication with a UE in a wireless communication network.
  • FIG. 3 is a diagram illustrating an example of an indication for a two-step random access fallback procedure.
  • FIG. 4 is a diagram illustrating an example of a media access control messaging structure for an indication as described in connection with FIG. 3.
  • FIG. 5 is a diagram illustrating an example of a media access control messaging structure for multiple UEs.
  • FIG. 6 is a diagram illustrating an example of a media access control messaging structure for an indication as described in connection with FIG. 3.
  • FIG. 7 is a diagram illustrating an example of a media access control messaging structure for multiple UEs.
  • FIG. 8 is a diagram illustrating an example of a media access control messaging structure for an indication as described in connection with FIG. 3.
  • FIG. 9 is a diagram illustrating an example of a media access control messaging structure for multiple UEs.
  • FIG. 10 is a flow chart of a method of wireless communication.
  • FIG. 11 is a conceptual data flow diagram illustrating the data flow between different modules/means/components in an example apparatus.
  • FIG. 12 is a diagram illustrating an example of a hardware implementation for an apparatus employing a processing system.
  • FIG. 13 is a flow chart of a method of wireless communication.
  • FIG. 14 is a conceptual data flow diagram illustrating the data flow between different modules/means/components in an example apparatus.
  • FIG. 15 is a diagram illustrating an example of a hardware implementation for an apparatus employing a processing system.
  • FIG. 16 is a diagram illustrating an example of a media access control messaging structure for an idle-mode or inactive-mode UE associated with a successful random access message.
  • FIGs. 17A and 17B are diagrams illustrating examples of a media access control messaging structure for UE associated with a random access message for which the payload was unsuccessfully received, and an example of a media access control subheader for a UE from which no part of the random access message was successfully received.
  • FIG. 18 is a diagram illustrating an example of a media access control messaging structure for a connected-mode UE associated with a random access message for which the payload was successfully received.
  • FIG. 19 is a diagram illustrating examples of media access control message payloads for a connected-mode UE associated with a successful random access message.
  • FIG. 20 is a diagram illustrating an example of a media access control messaging structure for multiple UEs.
  • processors include microprocessors, microcontrollers, digital signal processors (DSPs) , field programmable gate arrays (FPGAs) , programmable logic devices (PLDs) , state machines, gated logic, discrete hardware circuits, and other suitable hardware configured to perform the various functionality described throughout this disclosure.
  • DSPs digital signal processors
  • FPGAs field programmable gate arrays
  • PLDs programmable logic devices
  • state machines gated logic, discrete hardware circuits, and other suitable hardware configured to perform the various functionality described throughout this disclosure.
  • One or more processors in the processing system may execute software.
  • Software shall be construed broadly to mean instructions, instruction sets, code, code segments, program code, programs, subprograms, software modules, applications, software applications, software packages, routines, subroutines, objects, executables, threads of execution, procedures, functions, and/or the like, whether referred to as software, firmware, middleware, microcode, hardware description language, or otherwise.
  • the functions described may be implemented in hardware, software, firmware, or any combination thereof. If implemented in software, the functions may be stored on or encoded as one or more instructions or code on a computer-readable medium.
  • Computer-readable media includes computer storage media. Storage media may be any available media that can be accessed by a computer.
  • such computer-readable media can comprise a random-access memory (RAM) , a read-only memory (ROM) , an electrically erasable programmable ROM (EEPROM) , compact disk ROM (CD-ROM) or other optical disk storage, magnetic disk storage or other magnetic storage devices, combinations of the aforementioned types of computer-readable media, or any other medium that can be used to store computer executable code in the form of instructions or data structures that can be accessed by a computer.
  • RAM random-access memory
  • ROM read-only memory
  • EEPROM electrically erasable programmable ROM
  • CD-ROM compact disk ROM
  • magnetic disk storage magnetic disk storage or other magnetic storage devices
  • FIG. 1 is a diagram illustrating a wireless network 100 in which aspects of the present disclosure may be practiced.
  • the wireless network 100 may be an LTE network or some other wireless network, such as a 5G network.
  • the wireless network 100 may include a number of BSs 110 (shown as BS 110a, BS 110b, BS 110c, and BS 110d) and other network entities.
  • a BS is an entity that communicates with user equipment (UEs) and may also be referred to as a base station, a 5G BS, a Node B, a gNB, a 5G NB, an access point, a transmit receive point (TRP) , and/or the like.
  • Each BS may provide communication coverage for a particular geographic area.
  • the term “cell” can refer to a coverage area of a BS and/or a BS subsystem serving this coverage area, depending on the context in which the term is used.
  • a BS may provide communication coverage for a macro cell, a pico cell, a femto cell, and/or another type of cell.
  • a macro cell may cover a relatively large geographic area (e.g., several kilometers in radius) and may allow unrestricted access by UEs with service subscription.
  • a pico cell may cover a relatively small geographic area and may allow unrestricted access by UEs with service subscription.
  • a femto cell may cover a relatively small geographic area (e.g., a home) and may allow restricted access by UEs having association with the femto cell (e.g., UEs in a closed subscriber group (CSG) ) .
  • a BS for a macro cell may be referred to as a macro BS.
  • a BS for a pico cell may be referred to as a pico BS.
  • a BS for a femto cell may be referred to as a femto BS or a home BS.
  • a BS 110a may be a macro BS for a macro cell 102a
  • a BS 110b may be a pico BS for a pico cell 102b
  • a BS 110c may be a femto BS for a femto cell 102c.
  • a BS may support one or multiple (e.g., three) cells.
  • eNB base station
  • 5G BS base station
  • gNB gNB
  • TRP AP
  • AP node B
  • 5G NB 5G NB
  • cell may be used interchangeably herein.
  • a cell may not necessarily be stationary, and the geographic area of the cell may move according to the location of a mobile BS.
  • the BSs may be interconnected to one another and/or to one or more other BSs or network nodes (not shown) in the wireless network 100 through various types of backhaul interfaces such as a direct physical connection, a virtual network, and/or the like using any suitable transport network.
  • Wireless network 100 may also include relay stations.
  • a relay station is an entity that can receive a transmission of data from an upstream station (e.g., a BS or a UE) and send a transmission of the data to a downstream station (e.g., a UE or a BS) .
  • a relay station may also be a UE that can relay transmissions for other UEs.
  • a relay station 110d may communicate with macro BS 110a and a UE 120d in order to facilitate communication between BS 110a and UE 120d.
  • a relay station may also be referred to as a relay BS, a relay base station, a relay, and/or the like.
  • Wireless network 100 may be a heterogeneous network that includes BSs of different types, e.g., macro BSs, pico BSs, femto BSs, relay BSs, and/or the like. These different types of BSs may have different transmit power levels, different coverage areas, and different impacts on interference in wireless network 100.
  • macro BSs may have a high transmit power level (e.g., 5 to 40 Watts) whereas pico BSs, femto BSs, and relay BSs may have lower transmit power levels (e.g., 0.1 to 2 Watts) .
  • a network controller 130 may couple to a set of BSs and may provide coordination and control for these BSs.
  • Network controller 130 may communicate with the BSs via a backhaul.
  • the BSs may also communicate with one another, e.g., directly or indirectly via a wireless or wireline backhaul.
  • UEs 120 may be dispersed throughout wireless network 100, and each UE may be stationary or mobile.
  • a UE may also be referred to as an access terminal, a terminal, a mobile station, a subscriber unit, a station, etc.
  • a UE may be a cellular phone (e.g., a smart phone) , a personal digital assistant (PDA) , a wireless modem, a wireless communication device, a handheld device, a laptop computer, a cordless phone, a wireless local loop (WLL) station, a tablet, a camera, a gaming device, a netbook, a smartbook, an ultrabook, a medical device or equipment, biometric sensors/devices, wearable devices (smart watches, smart clothing, smart glasses, smart wrist bands, smart jewelry (e.g., smart ring, smart bracelet) ) , an entertainment device (e.g., a music or video device, or a satellite radio) , a vehicular component or sensor, smart meters/sensors, industrial manufacturing equipment, a global positioning system device, or any other suitable device that is configured to communicate via a wireless or wired medium.
  • PDA personal digital assistant
  • WLL wireless local loop
  • Some UEs may be considered machine-type communication (MTC) or evolved or enhanced machine-type communication (eMTC) UEs.
  • MTC and eMTC UEs include, for example, robots, drones, remote devices, sensors, meters, monitors, location tags, etc., that may communicate with a base station, another device (e.g., remote device) , or some other entity.
  • a wireless node may provide, for example, connectivity for or to a network (e.g., a wide area network such as Internet or a cellular network) via a wired or wireless communication link.
  • Some UEs may be considered Internet-of-Things (IoT) devices, and/or may be implemented as NB-IoT (narrowband internet of things) devices.
  • Some UEs may be considered a Customer Premises Equipment (CPE) .
  • UE 120 may be included inside a housing that houses components of UE 120, such as processor components, memory components, and/or the like.
  • any number of wireless networks may be deployed in a given geographic area.
  • Each wireless network may support a particular RAT and may operate on one or more frequencies.
  • a RAT may also be referred to as a radio technology, an air interface, and/or the like.
  • a frequency may also be referred to as a carrier, a frequency channel, and/or the like.
  • Each frequency may support a single RAT in a given geographic area in order to avoid interference between wireless networks of different RATs.
  • 5G RAT networks may be deployed.
  • a scheduling entity e.g., a base station
  • the scheduling entity may be responsible for scheduling, assigning, reconfiguring, and releasing resources for one or more subordinate entities. That is, for scheduled communication, subordinate entities utilize resources allocated by the scheduling entity.
  • a UE may access the air interface by performing a random access procedure, such as a physical random access (PRACH) procedure, and/or the like.
  • PRACH physical random access
  • the random access procedure may include a two-step random access procedure or a four-step random access procedure. “RACH procedure” may be used interchangeably with “random access procedure” herein.
  • Base stations are not the only entities that may function as a scheduling entity. That is, in some examples, a UE may function as a scheduling entity, scheduling resources for one or more subordinate entities (e.g., one or more other UEs) . In these examples, the UE is functioning as a scheduling entity, and other UEs utilize resources scheduled by the UE for wireless communication.
  • a UE may function as a scheduling entity in a peer-to-peer (P2P) network, and/or in a mesh network. In a mesh network example, UEs may optionally communicate directly with one another in addition to communicating with the scheduling entity.
  • P2P peer-to-peer
  • mesh network UEs may optionally communicate directly with one another in addition to communicating with the scheduling entity.
  • a scheduling entity and one or more subordinate entities may communicate utilizing the scheduled resources.
  • FIG. 1 is provided merely as an example. Other examples may differ from what is described with regard to FIG. 1.
  • FIG. 2 shows a block diagram 200 of a design of base station 110 and UE 120, which may be one of the base stations and one of the UEs in FIG. 1.
  • Base station 110 may be equipped with T antennas 234a through 234t
  • UE 120 may be equipped with R antennas 252a through 252r, where in general T ⁇ 1 and R ⁇ 1.
  • a transmit processor 220 may receive data from a data source 212 for one or more UEs, may select a modulation and coding scheme (MCS) for each UE based at least in part on channel quality indicators (CQIs) received from the UE, process (e.g., encode and modulate) the data for each UE based at least in part on the MCS selected for the UE, and provide data symbols for all UEs. Transmit processor 220 may also process system information (e.g., for semi-static resource partitioning information (SRPI) , and/or the like) and control information (e.g., CQI requests, grants, upper layer signaling, and/or the like) and provide overhead symbols and control symbols.
  • MCS modulation and coding scheme
  • CQIs channel quality indicators
  • Transmit processor 220 may also process system information (e.g., for semi-static resource partitioning information (SRPI) , and/or the like) and control information (e.g., CQI requests, grants, upper layer
  • Transmit processor 220 may also generate reference symbols for reference signals (e.g., the cell-specific reference signal) and synchronization signals (e.g., the primary synchronization signal (PSS) and secondary synchronization signal (SSS) ) .
  • a transmit (TX) multiple-input multiple-output (MIMO) processor 230 may perform spatial processing (e.g., precoding) on the data symbols, the control symbols, the overhead symbols, and/or the reference symbols, if applicable, and may provide T output symbol streams to T modulators (MODs) 232a through 232t. Each modulator 232 may process a respective output symbol stream (e.g., for OFDM and/or the like) to obtain an output sample stream.
  • Each modulator 232 may further process (e.g., convert to analog, amplify, filter, and upconvert) the output sample stream to obtain a downlink signal.
  • T downlink signals from modulators 232a through 232t may be transmitted via T antennas 234a through 234t, respectively.
  • the synchronization signals can be generated with location encoding to convey additional information.
  • antennas 252a through 252r may receive the downlink signals from base station 110 and/or other base stations and may provide received signals to demodulators (DEMODs) 254a through 254r, respectively.
  • Each demodulator 254 may condition (e.g., filter, amplify, downconvert, and digitize) a received signal to obtain input samples.
  • Each demodulator 254 may further process the input samples (e.g., for OFDM and/or the like) to obtain received symbols.
  • a MIMO detector 256 may obtain received symbols from all R demodulators 254a through 254r, perform MIMO detection on the received symbols if applicable, and provide detected symbols.
  • a receive (RX) processor 258 may process (e.g., demodulate and decode) the detected symbols, provide decoded data for UE 120 to a data sink 260, and provide decoded control information and system information to a controller/processor 280.
  • a channel processor may determine reference signal received power (RSRP) , received signal strength indicator (RSSI) , reference signal received quality (RSRQ) , channel quality indicator (CQI) , and/or the like.
  • a transmit processor 264 may receive and process data from a data source 262 and control information (e.g., for reports comprising RSRP, RSSI, RSRQ, CQI, and/or the like) from controller/processor 280. Transmit processor 264 may also generate reference symbols for one or more reference signals. The symbols from transmit processor 264 may be precoded by a TX MIMO processor 266 if applicable, further processed by modulators 254a through 254r (e.g., for DFT-s-OFDM, CP-OFDM, and/or the like) , and transmitted to base station 110.
  • modulators 254a through 254r e.g., for DFT-s-OFDM, CP-OFDM, and/or the like
  • the uplink signals from UE 120 and other UEs may be received by antennas 234, processed by demodulators 232, detected by a MIMO detector 236 if applicable, and further processed by a receive processor 238 to obtain decoded data and control information sent by UE 120.
  • Receive processor 238 may provide the decoded data to a data sink 239 and the decoded control information to controller/processor 240.
  • Base station 110 may include communication unit 244 and communicate to network controller 130 via communication unit 244.
  • Network controller 130 may include communication unit 294, controller/processor 290, and memory 292.
  • Controller/processor 240 of base station 110, controller/processor 280 of UE 120, and/or any other component (s) of Fig. 2 may perform one or more techniques associated with indication for two-step RACH fallback to four-step RACH, as described in more detail elsewhere herein.
  • controller/processor 240 of base station 110, controller/processor 280 of UE 120, and/or any other component (s) of Fig. 2 may perform or direct operations of, for example, method 1000 of Fig. 10, method 1300 of Fig. 13, and/or other processes as described herein.
  • Memories 242 and 282 may store data and program codes for BS 110 and UE 120, respectively.
  • a scheduler 246 may schedule UEs for data transmission on the downlink and/or uplink.
  • FIG. 2 is provided merely as an example. Other examples may differ from what is described with regard to FIG. 2.
  • FIG. 3 is a diagram illustrating an example 300 of indication for a two-step random access fallback procedure. As shown, example 300 includes a UE 120 and a BS 110.
  • the UE 120 may transmit a RACH Message (Msg) A to the BS 110.
  • the UE 120 may transmit the RACH Message A as part of a random access procedure, an initial access procedure, and/or the like.
  • the RACH Message A may be associated with a two-step RACH procedure.
  • the RACH Message A may include a preamble and a payload.
  • the preamble may be encoded based at least in part on a random access radio network temporary identifier, and/or may identify the UE 120.
  • the payload may include a physical uplink shared channel (PUSCH) , and may include contention information for the UE 120.
  • the BS 110 may perform contention resolution based at least in part on the RACH Message A, as described in more detail below.
  • the BS 110 may attempt to decode the RACH Message A. For example, the BS 110 may attempt to decode the preamble and the payload. The BS 110 may be more likely to successfully decode the preamble than the payload, since the preamble is shorter and more simply encoded than the payload.
  • Case A a first case, referred to as Case A, wherein the preamble and the payload are detected and successfully decoded by the BS 110; a second case, referred to as Case B, wherein the preamble is successfully decoded but the payload is not successfully decoded, and a third case, referred to as Case C, wherein neither the preamble nor the payload is decoded.
  • Case C a MAC subheader that includes only a backoff indicator may be used to indicate the outcome in RACH Message B.
  • the techniques and apparatuses described herein provide signaling to differentiate Case A and Case B and to indicate whether the UE should reattempt the RACH procedure, fall back to a four-step RACH procedure, or proceed with random access since the preamble and payload are successfully detected.
  • the BS 110 may provide an indication of whether the preamble and payload were successfully received (e.g., Case A) or whether the payload was not successfully decoded (e.g., Case B) .
  • the indication may indicate (e.g., implicitly or explicitly) whether the UE 120 is to complete the two-step random access procedure, reattempt the random access procedure, or fall back to a four-step RACH procedure. Particular structures of the indication are described in more detail in connection with FIGs. 3-9.
  • the indication may be provided in a random access response (RAR) , such as a RACH Message B, or in association with a random access response, as described in more detail in connection with FIGs. 3-9.
  • the indication may be provided in a RACH Message 2 (e.g., associated with a four-step RACH procedure) , as also described in more detail in connection with FIGs. 3-9.
  • the UE 120 may selectively reattempt the RACH procedure or fall back to the four-step RACH procedure (e.g., when the indication is associated with Case B) , or may complete the RACH procedure (e.g., when the indication is associated with Case A) , in accordance with the indication.
  • reattempting the RACH procedure may refer to selecting another RACH preamble and transmitting another RACH message (e.g., a RACH Message A associated with a two-step RACH procedure or a RACH Message 1 associated with a four-step RACH procedure) .
  • the UE 120 may retransmit the payload in RACH Message A.
  • the UE 120 may retransmit the payload in RACH Message 3.
  • the UE 120 may reattempt the random access when the indication indicates that the payload was not successfully received and/or that the contention of the UE 120 with another UE was resolved in favor of the other UE 120.
  • the UE 120 may transmit the payload using a RACH Message 3 of the four-step RACH procedure, thereby providing a second attempt at transmitting the payload without retransmitting the preamble.
  • the UE 120 may receive radio resource control (RRC) information, may configure an RRC connection based at least in part on the indication, and/or the like.
  • RRC radio resource control
  • FIG. 3 is provided as an example. Other examples may differ from what is described with respect to FIG. 3.
  • FIG. 4 is a diagram illustrating an example 400 of a media access control messaging structure for an indication as described in connection with FIG. 3.
  • the indication described in connection with example 400 may be included in a RAR from BS 110 to UE 120.
  • example 400 shows a MAC payload 410 and a corresponding MAC subheader 420.
  • the indication may be provided using the UE contention resolution identities shown by reference number 430.
  • the UE contention resolution identities may identify a UE whose payload was successfully decoded by the BS 110.
  • a contention resolution identity may identify a UE identifier of the corresponding UE 120.
  • a length of the RAR may be indicated by the value L in the MAC subheader 420, shown by reference number 440.
  • the BS 110 may transmit the indication as a RACH Message B using the structure shown by example 400. If the preamble is decoded successfully and the payload is not decoded successfully, then the BS 110 may transmit a RACH Message 2 (e.g., associated with a four-step RACH procedure) , which may be multiplexed in a MAC packet data unit (PDU) with a RACH Message B for a UE for which the payload and preamble were both successfully decoded.
  • a RACH Message 2 e.g., associated with a four-step RACH procedure
  • the BS 110 may transmit a RACH Message B with no UE contention resolution identities, which may indicate to a recipient UE 120 that the corresponding payload was not decoded successfully, or that the recipient UE 120 was not selected at a contention resolution stage of the BS 110.
  • the UE 120 may determine that the two-step RACH procedure is successful. If the UE 120 receives the RACH Message B and the RACH Message B does not include UE contention resolution information or the UE contention resolution information does not identify the UE 120, then the UE 120 may reattempt the random access using the two-step RACH procedure (e.g., by retransmitting RACH Message A on a subsequent RACH occasion) or using a four-step RACH procedure (e.g., by transmitting a preamble associated with the UE 120 on the subsequent RACH occasion) .
  • the two-step RACH procedure e.g., by retransmitting RACH Message A on a subsequent RACH occasion
  • a four-step RACH procedure e.g., by transmitting a preamble associated with the UE 120 on the subsequent RACH occasion
  • the UE 120 may use a timing advance command, an uplink grant, and a temporary cell radio network temporary identifier (TC-RNTI) of the RACH Message 2 to retransmit a payload of RACH Message A using a RACH Message 3 of the four-step RACH procedure.
  • TC-RNTI temporary cell radio network temporary identifier
  • the UE 120 may fall back to the four-step RACH procedure when the UE 120 receives the indication as RACH Message 2 of the four-step RACH procedure.
  • the BS 110 may provide, in RACH Message B, information identifying a timing advance command, an uplink grant, a cell radio network temporary identifier (C-RNTI) , or a UE contention resolution identity. Furthermore, the BS 110 may use the MAC subheader shown by reference number 420.
  • contention resolution information e.g., in a common control channel (CCCH) service data unit (SDU)
  • the BS 110 may provide, in RACH Message B, information identifying a timing advance command, an uplink grant, a cell radio network temporary identifier (C-RNTI) , or a UE contention resolution identity.
  • C-RNTI cell radio network temporary identifier
  • the BS 110 may use the MAC subheader shown by reference number 420.
  • the UE 120 may receive a RACH Message B in the format shown by reference number 410, but the contention resolution identity of the RACH Message B will not match the UE 120. In this case, the UE 120 may ignore the RACH Message B and may reattempt the random access using the two-step RACH procedure or the four-step RACH procedure.
  • a UE 120 may use a timing advance (TA) command, an uplink grant, and a TC-RNTI of the RACH Message 2 or the RACH Message B to retransmit the payload of the RACH Message A, and thus fall back to the remaining steps of the four-step RACH procedure.
  • TA timing advance
  • FIG. 4 is provided as an example. Other examples may differ from what is described with respect to FIG. 4.
  • FIG. 5 is a diagram illustrating an example 500 of a media access control messaging structure for multiple UEs.
  • Example 500 includes a random access response that includes a set of MAC sub-packet-data-units (subPDUs) for a set of UEs that attempt random access with regard to a BS 110.
  • the BS 110 may provide indications for the set of UEs that indicate whether each UE’s preamble and/or payload was successfully received.
  • a UE1 and a UE2 use a first preamble index and a UE3 and a UE4 use a second preamble index, and assume that the UE1, the UE2, the UE3, and the UE4 perform a two-step RACH procedure.
  • the BS 110 successfully decodes the preambles of all four UEs, and that the BS 110 successfully decodes the payload of only the UE1.
  • the BS 110 may provide a first MAC subheader for the UE1 and the UE2, shown by reference number 510, that indicates a length of a corresponding RACH Message B (using the variable L, shown in the MAC subheader) .
  • the corresponding RACH Message B shown by reference number 520, may include a UE contention resolution identity of the UE1 (not shown) , since the UE1’s payload was successfully received and the UE2’s payload was not successfully received, thereby causing the BS 110 to resolve the contention in favor of the UE1.
  • the BS 110 may provide a second MAC subheader for the UE3 and the UE4, shown by reference number 530.
  • the second MAC subheader may indicate a length of a corresponding RACH Message B or RACH Message 2 (using the variable L) .
  • the BS 110 may provide a RACH Message 2 (or may provide a RACH Message B without a UE contention resolution identity, which is not shown) in connection with the MAC subheader 530 that identifies the length of the corresponding RACH Message 2, thus indicating that the payloads of UE3 and UE4 were not received.
  • UE3 and UE4 may fall back to the four-step RACH procedure to retransmit the payload of RACH Message A.
  • FIG. 5 is provided as an example. Other examples may differ from what is described with respect to FIG. 5.
  • FIG. 6 is a diagram illustrating an example 600 of a media access control messaging structure for an indication as described in connection with FIG. 3.
  • Example 600 shows a MAC payload for a RACH Message B.
  • an indication bit shown by reference number 610, is used as the indicator (e.g., by switching a value of F) .
  • the BS 110 may set F to a first value (e.g., 0) in RACH Message B. If the BS 110 does not successfully decode the payload, then the BS 110 may set F to a second value (e.g., 1) .
  • a UE 120 may check a value of a contention resolution MAC control element (CE) . If the contention resolution identity matches the UE 120, then the UE 120 may complete the two-step RACH procedure. If the contention resolution identity does not match the UE 120, then the UE 120 may reattempt the RACH procedure using a two-step RACH procedure or a four-step RACH procedure.
  • CE contention resolution MAC control element
  • a UE 120 may use a TA command, an uplink grant, and a C-RNTI of the RACH Message B to retransmit a payload of the RACH Message A (e.g., by falling back to the four-step RACH procedure) .
  • the payload may include contention resolution information (e.g., in a CCCH SDU) in RACH Message A, and RACH Message B may identify a TA command, an uplink grant, a C-RNTI, and a MAC subheader with a RAPID and a UE contention resolution MAC CE that identifies a UE 120 from which the payload and preamble were successfully received.
  • contention resolution information e.g., in a CCCH SDU
  • RACH Message B may identify a TA command, an uplink grant, a C-RNTI, and a MAC subheader with a RAPID and a UE contention resolution MAC CE that identifies a UE 120 from which the payload and preamble were successfully received.
  • the RACH Message B may be transmitted by the BS 110 with a MAC subheader that includes a RAPID. If the indication bit is set to a first value, then the UE 120 may ignore the RACH Message B, and may reattempt transmission using the two-step or the four-step RACH procedure. If the indication bit is set to a second value, then the UE 120 may use a TA command, an uplink grant, and a C-RNTI identified by RACH Message B to retransmit a payload of RACH Message A in order to perform a fallback to the four-step RACH procedure.
  • FIG. 6 is provided as an example. Other examples may differ from what is described with respect to FIG. 6.
  • FIG. 7 is a diagram illustrating an example 700 of a media access control messaging structure for multiple UEs.
  • Example 700 includes a random access response that includes a set of MAC sub-packet-data-units (subPDUs) for a set of UEs that attempt random access with regard to a BS 110.
  • the BS 110 may provide indications for the set of UEs that indicate whether each UE’s preamble and/or payload was successfully received.
  • a UE1 and a UE2 use a first preamble index and a UE3 and a UE4 use a second preamble index, and assume that the UE1, the UE2, the UE3, and the UE4 perform a two-step RACH procedure.
  • the BS 110 successfully decodes the preambles of all four UEs, and that the BS 110 successfully decodes the payload of only the UE1.
  • the BS 110 may provide UE contention resolution information that identifies the UE1 based at least in part on successfully decoding the payload of the UE1.
  • the UE1 may determine that the two-step RACH procedure is successful (e.g., based at least in part on the UE contention resolution identity MAC CE identifying the UE1 and the indication bit being set to the first value) and the UE2 may determine that the UE2 is to reattempt the RACH procedure (e.g., based at least in part on the UE contention resolution identity MAC CE not identifying the UE2 and the indication bit being set to the first value) .
  • a MAC subheader associated with UE3 and UE4 may identify a RAPID of UE3 and UE4 (e.g., RAPID2) .
  • FIG. 7 is provided as an example. Other examples may differ from what is described with respect to FIG. 7.
  • FIG. 8 is a diagram illustrating an example 800 of a media access control messaging structure for an indication as described in connection with FIG. 3.
  • a MAC subheader that does not include a RAPID may be used for the RACH Message B. If the payload is not decoded successfully, then a MAC subheader that includes a RAPID may be used for the RACH message B.
  • the UE 120 may determine whether the BS 110 successfully decoded the payload based at least in part on whether the MAC subheader associated with the UE 120 includes a RAPID associated with the UE 120, and based at least in part on whether a contention resolution MAC CE of the UE 120 is included in the RACH Message B. For example, if the contention resolution MAC CE of the UE 120 matches a UE identifier of the UE 120, and if the MAC subheader does not include a RAPID, then the UE 120 may determine that the two-step RACH procedure was successful.
  • the UE 120 may identify the RAPID, and may use a TA command, an uplink grant, and a C-RNTI of the RACH Message B to retransmit the payload in order to fall back to the four-step RACH.
  • the MAC CEs and the corresponding MAC subheaders together with the random access responses are provided in sequence. For example, if UE1’s MAC CE is the first MAC CE and UE2’s MAC CE is the second MAC CE, then UE1’s random access response may use the first subPDU, and UE2’s random access response may use the second subPDU.
  • Reference number 810 illustrates a first MAC subheader with a backoff indicator (BI) and no RAPID.
  • the values T and F of the MAC subheader may indicate whether the first MAC subheader is to include a backoff indicator, a RAPID, or a set of reserved bits.
  • T may be associated with a first value
  • F may be associated with the first value, indicating that the first MAC subheader is to include the backoff indicator and no RAPID.
  • Reference number 820 illustrates a second MAC subheader with a RAPID, which may be used to indicate that the UE 120 is to retransmit the payload.
  • T may be associated with a second value, indicating that the second MAC subheader is to include a RAPID.
  • Reference number 830 illustrates a third MAC subheader with one or more reserved bits and no RAPID, which may be used, in conjunction with a contention resolution MAC CE, to indicate that the payload was successfully received.
  • the value T may be set to the first value and F may be set to a second value, which may indicate that the third MAC subheader is to include the one or more reserved bits and no RAPID or backoff indicator.
  • FIG. 8 is provided as an example. Other examples may differ from what is described with respect to FIG. 8.
  • FIG. 9 is a diagram illustrating an example 900 of a media access control messaging structure for multiple UEs.
  • Example 900 includes a random access response that includes a set of MAC sub-packet-data-units (subPDUs) for a set of UEs that attempt random access with regard to a BS 110.
  • the BS 110 may provide indications for the set of UEs that indicate whether each UE’s preamble and/or payload was successfully received.
  • a UE1 and a UE2 use a first preamble index and a UE3 and a UE4 use a second preamble index, and assume that the UE1, the UE2, the UE3, and the UE4 perform a two-step RACH procedure.
  • the BS 110 successfully decodes the preambles of all four UEs, and that the BS 110 successfully decodes the payload of only the UE1.
  • the BS 110 may provide UE contention resolution information that identifies the UE1 based at least in part on successfully decoding the payload of the UE1.
  • a MAC subheader associated with the UE1 and the UE2 may not include a RAPID, indicating that the BS 110 successfully decoded a payload associated with UE1 or UE2.
  • the UE1 may complete the two-step RACH procedure.
  • the UE2 may not receive the random access response, since the random access response does not include the RAPID for the UE2.
  • a MAC subheader associated with the UE3 and the UE4 may include a RAPID associated with the UE3 and the UE4, so the UE3 and the UE4 may accordingly fall back to the four-step RACH procedure.
  • a combination of the procedures described in connection with examples 400/500, 600/700, and 800/900 may be performed in combination.
  • the BS may transmit a RACH Message B that includes UE contention resolution information, as described in more detail in connection with examples 400 and 500.
  • the RACH Message B may include a MAC subheader without a RAPID, with a value of F that indicates that a backoff indicator is not to be included in the MAC subheader, and a value of L that indicates a length of the RACH Message B.
  • examples 400/500, 600/700, and 800/900 may all be combined, or any pair of examples 400/500, 600/700, and 800/900 may be combined.
  • FIG. 9 is provided as an example. Other examples may differ from what is described with respect to FIG. 9.
  • FIG. 10 is a flow chart of a method 1000 of wireless communication. The method may be performed by a UE (e.g., the UE 120 of FIG. 1, the apparatus 1102/1102′, and/or the like) .
  • a UE e.g., the UE 120 of FIG. 1, the apparatus 1102/1102′, and/or the like.
  • the UE may attempt a random access by transmitting a random access message associated with a two-step random access procedure.
  • the random access message may include a RACH Message A.
  • the random access message may include a preamble and a payload.
  • the UE may receive an indication regarding the random access message.
  • the indication may indicate that a preamble of the random access message and a payload of the random access message were successfully decoded, or that the payload was not successfully decoded.
  • the indication comprises a random access response associated with the two-step random access procedure, and a payload of the random access response includes contention resolution information that identifies a particular UE from which the payload of the random access message was successfully decoded.
  • the UE when the contention resolution information within the random access response does not identify the UE, the UE is configured to reattempt the random access procedure.
  • a media access control (MAC) subheader of the random access response indicates a length of the random access response.
  • the random access response indicates that the payload was not successfully decoded based at least in part on the absence of contention resolution information that identifies the UE in the random access response.
  • a MAC subheader of the random access response includes a set of bits that indicate whether a backoff indicator is included in the MAC subheader.
  • the indication comprises a random access response associated with the two-step random access procedure, and contention resolution for the UE is based at least in part on a control channel that is addressed to the UE using a C-RNTI of the UE.
  • a payload of the random access response does not include the C-RNTI.
  • the random access response includes an uplink grant.
  • the random access response does not include an uplink grant.
  • the indication comprises a random access response associated with the two-step random access procedure, and the random access response identifies a C-RNTI of the UE.
  • a MAC subheader of the random access response includes a set of bits that indicate that the random access response is associated with a contention resolution for a connected-mode UE.
  • the random access response includes an uplink grant.
  • the random access response does not include an uplink grant.
  • the UE is in an idle mode or an inactive mode when the random access is attempted.
  • the indication is associated with a MAC subheader that includes a backoff indicator and a set of bits that indicate that the MAC subheader includes the backoff indicator.
  • the indication comprises a second message of the four-step random access procedure.
  • the second message indicates that the payload was not successfully decoded.
  • the UE is configured to perform the fallback to the four-step random access procedure when the second message is received.
  • the indication comprises an indication bit in a MAC payload of a random access response message.
  • the indication bit indicates whether to perform the fallback to the four-step random access procedure.
  • the UE when the indication bit indicates not to perform the fallback to the four-step random access procedure, the UE is configured to complete the two-step random access procedure when contention resolution information of the random access response message identifies the UE.
  • the UE when the indication bit indicates not to perform the fallback to the four-step random access procedure, the UE is configured to reattempt the random access when contention resolution information of the random access response message does not identify the UE.
  • a MAC subheader of the indication does not include a preamble identifier when the preamble and the payload were successfully decoded.
  • the MAC subheader does not include the preamble identifier, and a contention resolution MAC control element of the indication identifies a particular UE for which the payload and the preamble were successfully decoded, wherein contention resolution MAC control elements, including the contention resolution MAC control element, and corresponding MAC subheaders, including the MAC subheader, in connection with corresponding random access responses, are provided in sequence.
  • the MAC subheader includes a first bit that indicates whether a backoff indicator or the preamble identifier is to be included in the MAC subheader and a second bit that indicates whether a field of the MAC subheader is to be used for the backoff indicator or for one or more reserved bits.
  • a media access control (MAC) subheader of the random access response includes a set of bits that indicate that the random access response is associated with a contention resolution for an idle-mode or inactive-mode UE.
  • the indication when the preamble and the payload are successfully decoded, the indication comprises a random access response associated with the two-step random access procedure that includes contention resolution information in a payload of the random access response, wherein the indication includes a MAC subheader that does not include a preamble identifier.
  • the MAC subheader indicates a length of the random access response and whether the MAC subheader is to include a backoff indicator.
  • the UE may complete the two-step random access procedure when the indication indicates that the preamble of the random access message and the payload of the random access message were successfully decoded.
  • the UE may establish an RRC connection with the base station, may camp on a cell provided by the base station, and/or the like.
  • the user equipment may reattempt the random access or perform a fallback to a four-step random access procedure when the indication indicates that the payload was not successfully decoded.
  • the UE may reattempt random access using a two-step random access procedure or a four-step random access procedure.
  • the UE may retransmit a preamble and a payload in accordance with the two-step random access procedure or the four-step random access procedure.
  • the UE may perform a fallback to the four-step random access procedure.
  • the UE may retransmit a payload of the random access message as RACH Message 3 of the four-step RACH procedure.
  • reattempting random access may refer to transmitting a preamble and/or a payload of a random access message after the preamble and/or the payload has already been transmitted by the user equipment (e.g., on the same RACH occasion or on a different RACH occasion) .
  • FIG. 10 shows example blocks of a method of wireless communication
  • the method may include additional blocks, fewer blocks, different blocks, or differently arranged blocks than those shown in FIG. 10. Additionally, or alternatively, two or more blocks shown in FIG. 10 may be performed in parallel.
  • FIG. 11 is a conceptual data flow diagram 1100 illustrating the data flow between different modules/means/components in an example apparatus 1102.
  • the apparatus 1102 may be a UE.
  • the apparatus 1102 includes a reception module 1104 and/or a transmission module 1106.
  • the reception module 1104 may receive signals 1108 from a base station 1150 (e.g., BS 110 and/or the like) .
  • the signals 1108 may include a random access response, such as a RACH Message B or a RACH Message 2 including an indication of a result of decoding a RACH Message A, as described in more detail elsewhere herein.
  • the reception module 1104 may receive an indication that indicates that a preamble of the random access message and a payload of the random access message were successfully decoded, or that the payload was not successfully decoded.
  • the transmission module 1106 may transmit signals 1110 to the base station 1150.
  • the signals 1110 may include a random access message, such as a RACH Message A, a RACH Message 3, and/or the like.
  • the transmission module 1106 may transmit a random access message associated with a two-step random access procedure, complete the two-step RACH procedure, reattempt random access, or perform a fallback to a four-step random access procedure, as described elsewhere herein.
  • the apparatus may include additional modules that perform each of the blocks of the algorithm in the aforementioned method 1000 of FIG. 10 and/or the like. Each block in the aforementioned method 1000 of FIG. 10 and/or the like may be performed by a module and the apparatus may include one or more of those modules.
  • the modules may be one or more hardware components specifically configured to carry out the stated processes/algorithm, implemented by a processor configured to perform the stated processes/algorithm, stored within a computer-readable medium for implementation by a processor, or some combination thereof.
  • modules shown in FIG. 11 are provided as an example. In practice, there may be additional modules, fewer modules, different modules, or differently arranged modules than those shown in FIG. 11. Furthermore, two or more modules shown in FIG. 11 may be implemented within a single module, or a single module shown in FIG. 11 may be implemented as multiple, distributed modules. Additionally, or alternatively, a set of modules (e.g., one or more modules) shown in FIG. 11 may perform one or more functions described as being performed by another set of modules shown in FIG. 11.
  • FIG. 12 is a diagram 1200 illustrating an example of a hardware implementation for an apparatus 1102′ employing a processing system 1202.
  • the apparatus 1102′ may be a UE.
  • the processing system 1202 may be implemented with a bus architecture, represented generally by the bus 1204.
  • the bus 1204 may include any number of interconnecting buses and bridges depending on the specific application of the processing system 1202 and the overall design constraints.
  • the bus 1204 links together various circuits including one or more processors and/or hardware modules, represented by the processor 1206, the modules 1104, 1106, and the computer-readable medium /memory 1208.
  • the bus 1204 may also link various other circuits such as timing sources, peripherals, voltage regulators, and power management circuits, which are well known in the art, and therefore will not be described any further.
  • the processing system 1202 may be coupled to a transceiver 1210.
  • the transceiver 1210 is coupled to one or more antennas 1212.
  • the transceiver 1210 provides a means for communicating with various other apparatuses over a transmission medium.
  • the transceiver 1210 receives a signal from the one or more antennas 1212, extracts information from the received signal, and provides the extracted information to the processing system 1202, specifically the reception module 1104.
  • the transceiver 1210 receives information from the processing system 1202, specifically the transmission module 1106, and based at least in part on the received information, generates a signal to be applied to the one or more antennas 1212.
  • the processing system 1202 includes a processor 1206 coupled to a computer-readable medium /memory 1208.
  • the processor 1206 is responsible for general processing, including the execution of software stored on the computer-readable medium /memory 1208.
  • the software when executed by the processor 1206, causes the processing system 1202 to perform the various functions described herein for any particular apparatus.
  • the computer-readable medium /memory 1208 may also be used for storing data that is manipulated by the processor 1206 when executing software.
  • the processing system further includes at least one of the modules 1104 and 1106.
  • the modules may be software modules running in the processor 1206, resident/stored in the computer readable medium /memory 1208, one or more hardware modules coupled to the processor 1206, or some combination thereof.
  • the processing system 1202 may be a component of the UE 120 and may include the memory 282 and/or at least one of the TX MIMO processor 266, the RX processor 258, and/or the controller/processor 280.
  • the apparatus 1102/1102′ for wireless communication includes means for attempting a random access by transmitting a random access message associated with a two-step random access procedure; means for receiving an indication that indicates that a preamble of the random access message and a payload of the random access message were successfully decoded, or that the payload was not successfully decoded; and/or means for selectively: completing the two-step random access procedure when the indication indicates that the preamble of the random access message and the payload of the random access message were successfully decoded, or reattempting the random access or performing a fallback to a four-step random access procedure when the indication indicates that the payload was not successfully decoded.
  • the aforementioned means may be one or more of the aforementioned modules of the apparatus 1102 and/or the processing system 1202 of the apparatus 1102′ configured to perform the functions recited by the aforementioned means.
  • the processing system 1202 may include the TX MIMO processor 266, the RX processor 258, and/or the controller/processor 280.
  • the aforementioned means may be the TX MIMO processor 266, the RX processor 258, and/or the controller/processor 280 configured to perform the functions and/or operations recited herein.
  • FIG. 12 is provided as an example. Other examples may differ from what is described in connection with FIG. 12.
  • FIG. 13 is a flow chart of a method 1300 of wireless communication.
  • the method may be performed by a base station (e.g., the BS 110 of FIG. 1, the apparatus 1402/1402′, and/or the like) .
  • a base station e.g., the BS 110 of FIG. 1, the apparatus 1402/1402′, and/or the like.
  • the base station may receive, from a user equipment (UE) attempting a random access, a random access message associated with a two-step random access procedure.
  • a random access message may include a RACH Message A.
  • the random access message may include a preamble and a payload.
  • the base station may transmit an indication regarding the random access message.
  • the indication may indicate that a preamble of the random access message and a payload of the random access message were successfully decoded, or that the payload was not successfully decoded.
  • the indication comprises a random access response associated with the two-step random access procedure, wherein a payload of the random access response includes contention resolution information that identifies a particular UE for which the payload of the random access message was successfully decoded.
  • a MAC subheader of the random access response indicates a length of the random access response.
  • the random access response indicates that the payload was not successfully decoded based at least in part on the absence of contention resolution information that identifies the UE in the random access response.
  • a MAC subheader of the random access response includes a set of bits that indicate whether a backoff indicator is included in the MAC subheader.
  • the indication comprises a random access response associated with the two-step random access procedure, and contention resolution for the UE is based at least in part on a control channel that is addressed to the UE using a C-RNTI of the UE.
  • a payload of the random access response does not include the C-RNTI.
  • the random access response includes an uplink grant.
  • the random access response does not include an uplink grant.
  • the indication comprises a random access response associated with the two-step random access procedure, and the random access response identifies a C-RNTI of the UE.
  • a MAC subheader of the random access response includes a set of bits that indicate that the random access response is associated with a contention resolution for a connected-mode UE.
  • the random access response includes an uplink grant.
  • the random access response does not include an uplink grant.
  • the UE is in an idle mode or an inactive mode when the random access is attempted.
  • the indication is associated with a MAC subheader that includes a backoff indicator and a set of bits that indicate that the MAC subheader includes the backoff indicator.
  • the indication comprises a second message of a four-step random access procedure, wherein the second message indicates that the payload was not successfully decoded.
  • the indication comprises an indication bit in a MAC payload of a random access response message.
  • the indication bit indicates whether to perform the fallback to the four-step random access procedure.
  • the base station is configured to complete the two-step random access procedure when contention resolution information of the random access response message identifies the UE.
  • the base station when the indication bit indicates not to perform the fallback to the four-step random access procedure, is configured to receive messaging associated with reattempting random access when contention resolution information of the random access response message does not identify the UE.
  • a MAC subheader of the indication does not include a preamble identifier when the preamble and the payload were successfully decoded.
  • the MAC subheader when the preamble and the payload for a particular UE are successfully decoded, does not include the preamble identifier and a contention resolution MAC control element of the indication identifies the particular UE.
  • contention resolution MAC control elements including the contention resolution MAC control element, and corresponding MAC subheaders, including the MAC subheader, in connection with corresponding random access responses, are provided in sequence.
  • the MAC subheader includes a first bit that indicates whether a backoff indicator or the preamble identifier is to be included in the MAC subheader and a second bit that indicates whether a field of the MAC subheader is to be used for the backoff indicator or for one or more reserved bits.
  • the indication when the preamble and the payload are successfully decoded, the indication comprises a random access response associated with the two-step random access procedure that includes contention resolution information in a payload of the random access response, wherein the indication includes a MAC subheader that does not include a preamble identifier.
  • the MAC subheader indicates a length of the random access response and whether the MAC subheader is to include a backoff indicator.
  • the indication relates to multiple UEs including the UE.
  • the UE is a first UE, and the indication indicates whether respective payloads or respective preambles of the first UE and a second UE were decoded.
  • a media access control (MAC) subheader of the random access response includes a set of bits that indicate that the random access response is associated with a contention resolution for an idle-mode or inactive-mode UE.
  • MAC media access control
  • the base station may complete the two-step random access procedure when the indication indicates that the preamble of the random access message and the payload of the random access message were successfully decoded.
  • the base station may establish an RRC connection with the base station, may camp on a cell provided by the base station, and/or the like.
  • the base station may receive messaging associated with the UE reattempting the random access or performing a fallback to a four-step random access procedure when the indication indicates that the payload was not successfully decoded. For example, the UE may reattempt the random access using a two-step random access procedure or a four-step random access procedure. In this case, the UE may retransmit a preamble and a payload in accordance with the two-step random access procedure or the four-step random access procedure. In some aspects, the UE may perform a fallback to the four-step random access procedure. For example, the UE may retransmit a payload of the random access message as RACH Message 3 of the four-step RACH procedure.
  • the base station may receive the messaging described above.
  • FIG. 13 shows example blocks of a method of wireless communication
  • the method may include additional blocks, fewer blocks, different blocks, or differently arranged blocks than those shown in FIG. 13. Additionally, or alternatively, two or more blocks shown in FIG. 13 may be performed in parallel.
  • FIG. 14 is a conceptual data flow diagram 1400 illustrating data flow between different modules/means/components in an example apparatus 1402.
  • the apparatus 1402 may be a base station.
  • the apparatus 1402 includes a reception module 1404 and/or a transmission module 1406.
  • the reception module 1404 may receive signals 1408 from a UE 1450 (e.g., UE 120 and/or the like) .
  • the signals 1408 may include a random access message, such as a RACH Message A, a RACH Message 3, and/or the like.
  • the reception module 1404 may receive a random access message associated with a two-step random access procedure, complete the two-step RACH procedure, reattempt the random access, or perform a fallback to a four-step random access procedure, as described elsewhere herein.
  • the transmission module 1406 may transmit signals 1410 to the UE 1450.
  • the signals 1410 may include a random access response, such as a RACH Message B or a RACH Message 2 including an indication of a result of decoding a RACH Message A, as described in more detail elsewhere herein.
  • the transmission module 1406 may transmit an indication that indicates that a preamble of the random access message and a payload of the random access message were successfully decoded, or that the payload was not successfully decoded.
  • the apparatus may include additional modules that perform each of the blocks of the algorithm in the aforementioned method 1300 of FIG. 13 and/or the like. Each block in the aforementioned method 1300 of FIG. 13 and/or the like may be performed by a module and the apparatus may include one or more of those modules.
  • the modules may be one or more hardware components specifically configured to carry out the stated processes/algorithm, implemented by a processor configured to perform the stated processes/algorithm, stored within a computer-readable medium for implementation by a processor, or some combination thereof.
  • modules shown in FIG. 14 are provided as an example. In practice, there may be additional modules, fewer modules, different modules, or differently arranged modules than those shown in FIG. 14. Furthermore, two or more modules shown in FIG. 14 may be implemented within a single module, or a single module shown in FIG. 14 may be implemented as multiple, distributed modules. Additionally, or alternatively, a set of modules (e.g., one or more modules) shown in FIG. 14 may perform one or more functions described as being performed by another set of modules shown in FIG. 14.
  • FIG. 15 is a diagram 1500 illustrating an example of a hardware implementation for an apparatus 1402′ employing a processing system 1502.
  • the apparatus 1402′ may be a UE.
  • the processing system 1502 may be implemented with a bus architecture, represented generally by the bus 1504.
  • the bus 1504 may include any number of interconnecting buses and bridges depending on the specific application of the processing system 1502 and the overall design constraints.
  • the bus 1504 links together various circuits including one or more processors and/or hardware modules, represented by the processor 1506, the modules 1404, 1406, and the computer- readable medium /memory 1508.
  • the bus 1504 may also link various other circuits such as timing sources, peripherals, voltage regulators, and power management circuits, which are well known in the art, and therefore will not be described any further.
  • the processing system 1502 may be coupled to a transceiver 1510.
  • the transceiver 1510 is coupled to one or more antennas 1512.
  • the transceiver 1510 provides a means for communicating with various other apparatuses over a transmission medium.
  • the transceiver 1510 receives a signal from the one or more antennas 1512, extracts information from the received signal, and provides the extracted information to the processing system 1502, specifically the reception module 1404.
  • the transceiver 1510 receives information from the processing system 1502, specifically the transmission module 1406, and based at least in part on the received information, generates a signal to be applied to the one or more antennas 1512.
  • the processing system 1502 includes a processor 1506 coupled to a computer-readable medium /memory 1508.
  • the processor 1506 is responsible for general processing, including the execution of software stored on the computer-readable medium /memory 1508.
  • the software when executed by the processor 1506, causes the processing system 1502 to perform the various functions described herein for any particular apparatus.
  • the computer-readable medium /memory 1508 may also be used for storing data that is manipulated by the processor 1506 when executing software.
  • the processing system further includes at least one of the modules 1404 and 1406.
  • the modules may be software modules running in the processor 1506, resident/stored in the computer readable medium /memory 1508, one or more hardware modules coupled to the processor 1506, or some combination thereof.
  • the processing system 1502 may be a component of the eNB 110 and may include the memory 242 and/or at least one of the TX MIMO processor 230, the RX processor 238, and/or the controller/processor 240.
  • the apparatus 1402/1402′ for wireless communication includes means for receiving, from a user equipment (UE) attempting a random access, a random access message associated with a two-step random access procedure; means for transmitting an indication that indicates that a preamble of the random access message and a payload of the random access message were successfully decoded, or that the payload was not successfully decoded; and means for selectively: completing the two-step random access procedure when the indication indicates that the preamble of the random access message and the payload of the random access message were successfully decoded, or receiving messaging associated with the UE reattempting the random access or performing a fallback to a four-step random access procedure when the indication indicates that the payload was not successfully decoded.
  • UE user equipment
  • the aforementioned means may be one or more of the aforementioned modules of the apparatus 1402 and/or the processing system 1502 of the apparatus 1402′ configured to perform the functions recited by the aforementioned means.
  • the processing system 1502 may include the TX MIMO processor 230, the receive processor 238, and/or the controller/processor 240.
  • the aforementioned means may be the TX MIMO processor 230, the receive processor 238, and/or the controller/processor 240 configured to perform the functions and/or operations recited herein.
  • FIG. 15 is provided as an example. Other examples may differ from what is described in connection with FIG. 15.
  • FIG. 16 is a diagram illustrating an example 1600 of a media access control messaging structure for an idle-mode or inactive-mode UE associated with a successful random access message.
  • the MAC messaging structure shown in example 1600 may be used for a UE 120 that is in an idle mode or an inactive mode, and for which a payload and preamble of the UE 120’s random access message are successfully decoded.
  • a payload of an indicator (e.g., a random access response) of the MAC messaging structure is shown by reference number 1610.
  • the payload may be part of a random access response, and may identify contention resolution information for the UE 120.
  • the uplink grant and the C-RNTI may be used for a subsequent data.
  • the indicator may be associated with a MAC subheader.
  • the MAC subheader may include a set of bits (shown as F1 and F2) .
  • a value of the set of bits may indicate information regarding the MAC subheader and/or the payload.
  • the value of the set of bits may indicate that no BI field is present in the MAC subheader, and may indicate that contention resolution information is present in the random access response.
  • the Message B random access response may include a timing advance command, an uplink grant, a C-RNTI of a successful random access message, and contention resolution information.
  • FIG. 16 is provided as an example. Other examples may differ from what is described in connection with FIG. 16.
  • FIGs. 17A and 17B are diagrams illustrating examples 1700 of a media access control messaging structure for a UE associated with a random access message for which the payload was unsuccessfully received and the preamble was successfully received, and an example of a media access control subheader for a UE for which no part of the random access message was successfully received.
  • Examples 1700 include a MAC subheader 1710 and a MAC payload 1720 (shown in FIG. 17A) , and/or a MAC subheader 1730 (shown in FIG. 17B) .
  • MAC subheader 1710 and MAC payload 1720 may comprise a RACH Message 2 of the four-step RACH process.
  • a UE that receives MAC subheader 1710 and MAC payload 1720 may determine that a payload of a random access message transmitted by the UE was unsuccessfully decoded.
  • MAC subheader 1730 may include a set of bits (e.g., F1 and F2) .
  • a value of the set of bits may indicate that MAC subheader 1730 includes a BI field.
  • the BI field may be used by UEs for which neither the preamble nor the payload was successfully decoded. For example, the UE may determine that the RACH process was unsuccessful based at least in part on determining that the UE’s contention resolution information and preamble identifier are not identified by a set of random access responses, and may accordingly read MAC subheaders with BI information only to determine a BI value for a subsequent random access message by the UE.
  • Example 1700 is applicable for connected-mode UEs, idle-mode UEs, and inactive-mode UEs.
  • FIGs. 17A and 17B are provided as examples. Other examples may differ from what is described in connection with FIGs. 17A and 17B.
  • FIG. 18 is a diagram illustrating an example 1800 of a media access control messaging structure for a connected-mode UE associated with a random access message for which the payload was successfully received.
  • example 1800 includes a MAC subheader 1810 and a MAC payload 1820.
  • contention resolution may be performed using a physical downlink control channel (PDCCH) addressed using a C-RNTI identified by a random access message transmitted by the UE.
  • PDCCH physical downlink control channel
  • RACH Message A includes the C-RNTI MAC-CE
  • contention resolution may be performed using a PDCCH addressed to the C-RNTI of the successfully-decoded RACH Message A, and Message B may be directed to the UE associated with the C-RNTI.
  • RACH Message B may be addressed to the RA-RNTI and may contain information for multiple UEs.
  • the contention resolution may be based on the contention resolution ID included in RACH Message B, which may match the UE ID identified in RACH Message A.
  • RACH Message B may contain information for multiple UEs, and may be addressed to the RA-RNTI.
  • the C-RNTI may be included in the random access response as contention resolution information for an RRC_CONNECTED UE.
  • Example 1800 pertains to Option 1.
  • MAC subheader 1810 may include a set of bits (e.g., F1 and F2) .
  • the set of bits may be set to a value that indicates that the random access response is for a connected-mode UE.
  • the set of bits may indicate that the random access response is to include contention resolution information, as described in more detail below in connection with FIG. 19.
  • the set of bits may indicate whether the random access response is to include a BI field or other reserved bits.
  • the set of bits may indicate whether the random access response is for a connected-mode UE, or an idle-mode or inactive-mode UE.
  • MAC payload 1820 includes an uplink grant.
  • the uplink grant may be optional, as described elsewhere herein.
  • MAC payload 1820 may not include contention resolution information.
  • MAC payload 1820 may not need to include contention resolution information.
  • the uplink grant may be used for a subsequent data transmission.
  • MAC subheader 1810 may not identify a preamble identifier, since contention resolution is handled using the PDCCH addressed to the C-RNTI.
  • FIG. 18 is provided as an example. Other examples may differ from what is described in connection with FIG. 18.
  • FIG. 19 is a diagram illustrating examples 1900 of media access control message payloads for a connected-mode UE associated with a successful random access message.
  • Example 1910 illustrates a first example wherein the MAC payload includes an uplink grant and no contention resolution information.
  • Example 1920 illustrates a second example wherein the MAC payload includes no uplink grant and no contention resolution information.
  • Example 1930 illustrates a third example wherein the MAC payload includes an uplink grant and contention resolution information.
  • Example 1940 illustrates a fourth example wherein the MAC payload includes contention resolution information and no uplink grant.
  • contention resolution information is included in the random access response in the form of a C-RNTI, since UEs may use the RA-RNTI to decode the random access response sent from the BS 110.
  • FIG. 19 is provided as an example. Other examples may differ from what is described in connection with FIG. 19.
  • FIG. 20 is a diagram illustrating an example 2000 of a media access control messaging structure for multiple UEs. Random access responses for multiple UEs may be multiplexed as illustrated in example 2000. For example, and as shown by reference number 2010, a first MAC payload, using a RACH Message 2 format, may indicate that one or more corresponding UEs’ random access payloads were not successfully received. As shown by reference number 2020, a MAC subheader may include a set of bits (e.g., F1 and F2) that indicate whether the MAC subheader is for an idle-mode UE or a connected-mode UE.
  • F1 and F2 bits
  • the corresponding MAC payload may include a RACH Message B that identifies one or more UEs for a corresponding random access message that was successfully decoded.
  • a MAC subheader of MAC subPDU1 may include a set of bits (e.g., F1 and F2) that indicate whether the MAC subheader includes a backoff indicator. This MAC subheader may be used to provide backoff information for UEs for which the preamble and the payload were not successfully decoded.
  • FIG. 20 is provided as an example. Other examples may differ from what is described in connection with FIG. 20.
  • Combinations such as “at least one of A, B, or C, ” “at least one of A, B, and C, ” and “A, B, C, or any combination thereof” include any combination of A, B, and/or C, and may include multiples of A, multiples of B, or multiples of C.
  • combinations such as “at least one of A, B, or C, ” “at least one of A, B, and C, ” and “A, B, C, or any combination thereof” may be A only, B only, C only, A and B, A and C, B and C, or A and B and C, where any such combinations may contain one or more member or members of A, B, or C.

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Abstract

Certaines techniques et appareils décrits dans l'invention fournissent une indication d'un résultat de décodage d'un message de canal d'accès aléatoire à deux étapes (RACH) et d'une action devant être exécutée par un équipement utilisateur (UE). Par exemple, certaines techniques et appareils décrits dans l'invention peuvent fournir l'indication selon une approche basée sur l'identité de résolution de contention d'UE, l'identité de résolution de contention d'UE pouvant être fournie dans une réponse d'accès aléatoire. Certaines techniques et appareils décrits dans l'invention peuvent utiliser un indicateur de repli qui indique le résultat du décodage et/ou de l'action devant être exécutée. Certaines techniques et appareils décrits dans l'invention peuvent utiliser un sous-en-tête de réponse d'accès aléatoire (RAR) qui omet sélectivement un identifiant de préambule d'accès aléatoire sur la base, au moins en partie, du résultat du décodage et/ou de l'action devant être exécutée.
PCT/CN2019/085126 2019-04-11 2019-04-30 Contenu de message b de rach à deux étapes Ceased WO2020206768A1 (fr)

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PCT/CN2020/083627 WO2020207392A1 (fr) 2019-04-11 2020-04-08 Procédure d'accès aléatoire
US17/593,522 US12284690B2 (en) 2019-04-11 2020-04-08 Random access procedure
CN202510959701.6A CN120640427A (zh) 2019-04-11 2020-04-08 随机接入规程
EP20788422.2A EP3954173A4 (fr) 2019-04-11 2020-04-08 Procédure d'accès aléatoire
CN202080025180.2A CN113647191B (zh) 2019-04-11 2020-04-08 随机接入规程
SG11202109913Q SG11202109913QA (en) 2019-04-11 2020-04-08 Random access procedure
KR1020217031806A KR20210148164A (ko) 2019-04-11 2020-04-08 랜덤 액세스 절차
US19/093,400 US20250227777A1 (en) 2019-04-11 2025-03-28 Random access procedure

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PCT/CN2019/082238 WO2020206651A1 (fr) 2019-04-11 2019-04-11 Indication de repli de rach à deux étapes vers un rach à quatre étapes

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