WO2022159734A1 - Techniques de comptage de répétition de canal - Google Patents

Techniques de comptage de répétition de canal Download PDF

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Publication number
WO2022159734A1
WO2022159734A1 PCT/US2022/013361 US2022013361W WO2022159734A1 WO 2022159734 A1 WO2022159734 A1 WO 2022159734A1 US 2022013361 W US2022013361 W US 2022013361W WO 2022159734 A1 WO2022159734 A1 WO 2022159734A1
Authority
WO
WIPO (PCT)
Prior art keywords
repetitions
indication
random access
slots
processor
Prior art date
Application number
PCT/US2022/013361
Other languages
English (en)
Inventor
Mahmoud Taherzadeh Boroujeni
Tao Luo
Gokul SRIDHARAN
Original Assignee
Qualcomm Incorporated
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
Priority claimed from US17/648,536 external-priority patent/US20220240323A1/en
Application filed by Qualcomm Incorporated filed Critical Qualcomm Incorporated
Priority to CN202280010371.0A priority Critical patent/CN116724653A/zh
Priority to EP22703521.9A priority patent/EP4282214A1/fr
Publication of WO2022159734A1 publication Critical patent/WO2022159734A1/fr

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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
    • 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

Definitions

  • aspects of the present disclosure relate to wireless communications, and more particularly, to techniques for channel repetition.
  • Wireless communication systems are widely deployed to provide various telecommunication services such as telephony, video, data, messaging, broadcasts, or other similar types of services.
  • These wireless communication systems may employ multiple-access technologies capable of supporting communication with multiple users by sharing available system resources with those users (e.g., bandwidth, transmit power, or other resources).
  • Multiple-access technologies can rely on any of code division, time division, frequency division orthogonal frequency division, single-carrier frequency division, or time division synchronous code division, to name a few.
  • These and other multiple access technologies have been adopted in various telecommunication standards to provide a common protocol that enables different wireless devices to communicate on a municipal, national, regional, and even global level.
  • the apparatus generally includes a memory and a processor coupled to the memory.
  • the processor is configured to receive a first indication of one or more first slots that are counted for one or more repetitions of a random access channel (RACH) message and a second indication of a number of the one or more repetitions, each of the one or more repetitions of the RACH message being during a slot available for uplink communication, and transmit, to a base station, the RACH message and the one or more repetitions in accordance with the first indication and the second indication.
  • RACH random access channel
  • the apparatus generally includes a memory and a processor coupled to the memory.
  • the processor is configured to transmit a first indication of one or more first slots that are counted for one or more repetitions of a random access channel (RACH) message and a second indication of a number of the one or more repetitions, each of the one or more repetitions of the RACH message being during a slot available for uplink communication, and receive, from a user equipment (UE), at least one of the RACH message or the one or more repetitions in accordance with the first indication and the second indication.
  • RACH random access channel
  • One aspect provides a method for wireless communication by a UE.
  • the method generally includes receiving a first indication of one or more first slots that are counted for one or more repetitions of a random access channel (RACH) message and a second indication of a number of the one or more repetitions, each of the repetitions of the RACH message being during a slot available for uplink communication; and transmitting, to a base station, the RACH message and the one or more repetitions in accordance with the first indication and the second indication.
  • RACH random access channel
  • One aspect provides a method for wireless communication by a base station.
  • the method generally includes transmitting a first indication of one or more first slots that are counted for one or more repetitions of a random access channel (RACH) message and a second indication of a number of the one or more repetitions, each of the one or more repetitions of the RACH message being during a slot available for uplink communication; and receiving, from a user equipment (UE), at least one of the RACH message or the one or more repetitions in accordance with the first indication and the second indication.
  • RACH random access channel
  • the apparatus generally includes means for receiving a first indication of one or more first slots that are counted for one or more repetitions of a random access channel (RACH) message and a second indication of a number of the one or more repetitions, each of the repetitions of the RACH message being during a slot available for uplink communication; and means for transmitting, to a base station, the RACH message and the one or more repetitions in accordance with the first indication and the second indication.
  • RACH random access channel
  • the apparatus generally includes means for transmitting a first indication of one or more first slots that are counted for one or more repetitions of a random access channel (RACH) message and a second indication of a number of the one or more repetitions, each of the one or more repetitions of the RACH message being during a slot available for uplink communication; and means for receiving, from a user equipment (UE), at least one of the RACH message or the one or more repetitions in accordance with the first indication and the second indication.
  • RACH random access channel
  • One aspect provides a non-transitory computer-readable having instructions stored thereon to cause a UE to: receive a first indication of one or more first slots that are counted for one or more repetitions of a random access channel (RACH) message and a second indication of a number of the one or more repetitions, each of the repetitions of the RACH message being during a slot available for uplink communication; and transmit, to a base station, the RACH message and the one or more repetitions in accordance with the first indication and the second indication.
  • RACH random access channel
  • One aspect provides a non-transitory computer-readable having instructions stored thereon to cause a base station to: transmit a first indication of one or more first slots that are counted for one or more repetitions of a random access channel (RACH) message and a second indication of a number of the one or more repetitions, each of the one or more repetitions of the RACH message being during a slot available for uplink communication; and receive, from a user equipment (UE), at least one of the RACH message or the one or more repetitions in accordance with the first indication and the second indication.
  • RACH random access channel
  • One aspect provides a method for wireless communication by a userequipment (UE).
  • the method generally includes: determining a configuration of a number of repetitions of a channel to be transmitted using a random access channel (RACH) message, each of the repetitions of the channel being during a slot available for uplink (UL), wherein the number of repetitions corresponds to a number of the available slots to be used for the repetitions; and transmitting, to a base station, the RACH message in accordance with the configuration of the number of repetitions.
  • RACH random access channel
  • One aspect provide a method for wireless communication by a user-equipment (UE).
  • the method generally includes: receiving, from a base station, an indication of a repetition counting technique; determining a configuration of a number of repetitions of a channel to be transmitted using a random access channel (RACH) message, each of the repetitions of the channel being during a slot available for uplink (UL); selecting the available slots to be used for the repetitions based on the repetition counting technique and the configuration of the number of repetitions; and transmitting, to the base station, the RACH message in accordance with the selection of the available slots.
  • RACH random access channel
  • One aspect provide a method for wireless communication by a base station.
  • the method generally includes: determining a configuration of a number of repetitions of a channel to be received using a random access channel (RACH) message, each of the repetitions of the channel being during a slot available for uplink (UL), wherein the number of repetitions corresponds to a number of the available slots to be used for the repetitions; and receiving, from a user-equipment (UE), the RACH message in accordance with the configuration of the number of repetitions.
  • RACH random access channel
  • One aspect provide a method for wireless communication by a base station.
  • the method generally includes: transmitting, to a user-equipment (UE), an indication of a repetition counting technique; determining a configuration of a number of repetitions of a channel to be received using a random access channel (RACH) message, each of the repetitions of the channel being during a slot available for uplink (UL); selecting the available slots to be used for the repetitions based on the repetition counting technique and the configuration of the number of repetitions; and receiving, from the UE, the RACH message in accordance with the selection of the available slots.
  • UE user-equipment
  • RACH random access channel
  • the apparatus generally includes a memory and one or more processors coupled to the memory, the one or more processors and the memory being configured to: determine a configuration of a number of repetitions of a channel to be transmitted using a random access channel (RACH) message, each of the repetitions of the channel being during a slot available for uplink (UL), wherein the number of repetitions corresponds to a number of the available slots to be used for the repetitions; and transmit, to a base station, the RACH message in accordance with the configuration of the number of repetitions.
  • RACH random access channel
  • the apparatus generally includes a memory and one or more processors coupled to the memory, the one or more processors and the memory being configured to: receive, from a base station, an indication of a repetition counting technique; determine a configuration of a number of repetitions of a channel to be transmitted using a random access channel (RACH) message, each of the repetitions of the channel being during a slot available for uplink (UL); select the available slots to be used for the repetitions based on the repetition counting technique and the configuration of the number of repetitions; and transmitting, to the base station, the RACH message in accordance with the selection of the available slots.
  • RACH random access channel
  • the apparatus generally includes a memory and one or more processors coupled to the memory, the one or more processors and the memory being configured to: determine a configuration of a number of repetitions of a channel to be received using a random access channel (RACH) message, each of the repetitions of the channel being during a slot available for uplink (UL), wherein the number of repetitions corresponds to a number of the available slots to be used for the repetitions; and receive, from a userequipment (UE), the RACH message in accordance with the configuration of the number of repetitions.
  • RACH random access channel
  • the apparatus generally includes a memory and one or more processors coupled to the memory, the one or more processors and the memory being configured to: transmit, to a user-equipment (UE), an indication of a repetition counting technique; determine a configuration of a number of repetitions of a channel to be received using a random access channel (RACH) message, each of the repetitions of the channel being during a slot available for uplink (UL); select the available slots to be used for the repetitions based on the repetition counting technique and the configuration of the number of repetitions; and receive, from the UE, the RACH message in accordance with the selection of the available slots.
  • UE user-equipment
  • RACH random access channel
  • the apparatus generally includes: means for determining a configuration of a number of repetitions of a channel to be transmitted using a random access channel (RACH) message, each of the repetitions of the channel being during a slot available for uplink (UL), wherein the number of repetitions corresponds to a number of the available slots to be used for the repetitions; and means for transmitting, to a base station, the RACH message in accordance with the configuration of the number of repetitions.
  • RACH random access channel
  • the apparatus generally includes: means for receiving, from a base station, an indication of a repetition counting technique; means for determining a configuration of a number of repetitions of a channel to be transmitted using a random access channel (RACH) message, each of the repetitions of the channel being during a slot available for uplink (UL); means for selecting the available slots to be used for the repetitions based on the repetition counting technique and the configuration of the number of repetitions; and means for transmitting, to the base station, the RACH message in accordance with the selection of the available slots.
  • RACH random access channel
  • the apparatus generally includes: means for determining a configuration of a number of repetitions of a channel to be received using a random access channel (RACH) message, each of the repetitions of the channel being during a slot available for uplink (UL), wherein the number of repetitions corresponds to a number of the available slots to be used for the repetitions; and means for receiving, from a user-equipment (UE), the RACH message in accordance with the configuration of the number of repetitions.
  • RACH random access channel
  • the apparatus generally includes: means for transmitting, to a user-equipment (UE), an indication of a repetition counting technique; means for determining a configuration of a number of repetitions of a channel to be received using a random access channel (RACH) message, each of the repetitions of the channel being during a slot available for uplink (UL); means for selecting the available slots to be used for the repetitions based on the repetition counting technique and the configuration of the number of repetitions; and means for receiving, from the UE, the RACH message in accordance with the selection of the available slots.
  • UE user-equipment
  • RACH random access channel
  • One aspect provides a non-transitory computer-readable having instructions stored thereon to cause a user-equipment (UE) to: determine a configuration of a number of repetitions of a channel to be transmitted using a random access channel (RACH) message, each of the repetitions of the channel being during a slot available for uplink (UL), wherein the number of repetitions corresponds to a number of the available slots to be used for the repetitions; and transmit, to a base station, the RACH message in accordance with the configuration of the number of repetitions.
  • RACH random access channel
  • One aspect provides a non-transitory computer-readable having instructions stored thereon to cause a user-equipment (UE) to: receive, from a base station, an indication of a repetition counting technique; determine a configuration of a number of repetitions of a channel to be transmitted using a random access channel (RACH) message, each of the repetitions of the channel being during a slot available for uplink (UL); select the available slots to be used for the repetitions based on the repetition counting technique and the configuration of the number of repetitions; and transmit, to the base station, the RACH message in accordance with the selection of the available slots.
  • RACH random access channel
  • One aspect provides a non-transitory computer-readable having instructions stored thereon to cause a base station to: determine a configuration of a number of repetitions of a channel to be received using a random access channel (RACH) message, each of the repetitions of the channel being during a slot available for uplink (UL), wherein the number of repetitions corresponds to a number of the available slots to be used for the repetitions; and receive, from a user-equipment (UE), the RACH message in accordance with the configuration of the number of repetitions.
  • RACH random access channel
  • One aspect provides a non-transitory computer-readable having instructions stored thereon to cause a base station to: transmit, to a user-equipment (UE), an indication of a repetition counting technique; determine a configuration of a number of repetitions of a channel to be received using a random access channel (RACH) message, each of the repetitions of the channel being during a slot available for uplink (UL); select the available slots to be used for the repetitions based on the repetition counting technique and the configuration of the number of repetitions; and receive, from the UE, the RACH message in accordance with the selection of the available slots.
  • UE user-equipment
  • RACH random access channel
  • an apparatus operable, configured, or otherwise adapted to perform the aforementioned methods as well as those described elsewhere herein; a non-transitory, computer-readable media comprising instructions that, when executed by one or more processors of an apparatus, cause the apparatus to perform the aforementioned methods as well as those described elsewhere herein; a computer program product embodied on a computer-readable storage medium comprising code for performing the aforementioned methods as well as those described elsewhere herein; and an apparatus comprising means for performing the aforementioned methods as well as those described elsewhere herein.
  • an apparatus may comprise a processing system, a device with a processing system, or processing systems cooperating over one or more networks.
  • FIG. 1 is a block diagram conceptually illustrating an example wireless communication network.
  • FIG. 2 is a block diagram conceptually illustrating aspects of an example a base station and user equipment.
  • FIGS. 3A-3D depict various example aspects of data structures for a wireless communication network.
  • FIG. 4 is a call-flow diagram illustrating an example four-step random access channel (RACH) procedure, in accordance with certain aspects of the present disclosure.
  • RACH random access channel
  • FIGs. 5A and 5B illustrate repetition counting techniques, in accordance with certain aspects of the present disclosure.
  • FIG. 6 is a flow diagram illustrating example operations for wireless communication, in accordance with certain aspects of the present disclosure.
  • FIG. 7 is a flow diagram illustrating example operations for wireless communication, in accordance with certain aspects of the present disclosure.
  • FIG. 8 is a call flow diagram illustrating example techniques for physical uplink shared channel (PUSCH) repetition during a RACH procedure, in accordance with certain aspects of the present disclosure.
  • PUSCH physical uplink shared channel
  • FIG. 9 is a flow diagram illustrating example operations for wireless communication, in accordance with certain aspects of the present disclosure.
  • FIG. 10 is a flow diagram illustrating example operations for wireless communication, in accordance with certain aspects of the present disclosure.
  • FIG. 11 is a flow diagram illustrating example operations for wireless communication, in accordance with certain aspects of the present disclosure.
  • FIG. 12 is a flow diagram illustrating example operations for wireless communication, in accordance with certain aspects of the present disclosure.
  • FIGs. 13 and 14 depict example communications devices that include various components operable, configured, or adapted to perform operations for the techniques disclosed herein.
  • aspects of the present disclosure provide apparatuses, methods, processing systems, and computer readable mediums for channel repetition.
  • a user equipment may be configured to transmit certain information (e.g., data and/or control signaling) with repetitions for coverage enhancements.
  • a receiver e.g., a base station
  • the UE may be expected to count every slot beginning from the slot of the first transmission as a potential slot for a repetition, irrespective of whether the slot is configured for downlink or uplink communications. Counting repetitions in this manner can lead to counting downlink resources and a shortfall in actual repetitions transmitted by the UE.
  • the UE will not use the downlink resources for transmission of repetitions despite the downlink resources being counted for such.
  • the UE may be configured to transmit three repetitions, where the two slots following the first transmission are for downlink communications rather than uplink communications.
  • the UE will count the downlink slots towards the repetition number but not use the downlink slots for the repetitions.
  • the UE may only transmit the first transmission without the other two repetitions as the downlink slots can be counted as slots for the repetitions and not used for repetitions.
  • One or more aspects of the present disclosure provide techniques and apparatus for selecting certain slots available for uplink communication as slots used for repetitions of an uplink transmission, for example, according to an indication of the slots available for uplink communication.
  • the UE may receive indications of the slots that can be counted for repetitions of an uplink transmission and the number of repetitions.
  • the UE may select the slots used for repetitions based on the slots available for uplink communication.
  • the slot selection for repetitions described herein may be used specifically for a particular random access channel (RACH) message (e.g., MSG3) in a four-step RACH procedure, for example, as further described herein with respect to FIGs. 4 and 8.
  • RACH random access channel
  • MSG3 random access channel
  • the slot selection for repetitions described herein may facilitate desirable wireless communication performance, such as reduced latencies and/or increased throughput, for example, due to the repetitions facilitating decoding of a channel at a receiver, for example, by combining the repetitions at the receiver (e.g., a base station) to enhance the signal quality of the channel.
  • the slot selection for repetitions described herein may facilitate enhanced coverage for a particular RACH message (e.g., MSG3), for example, due to the repetitions of the RACH message.
  • the coverage enhancement may enable a UE to communicate at a reduced power and/or at a cell’s edge, for example.
  • the repetition of a transmission and/or a channel generally refers to a transmitter (e.g., a UE) transmitting two or more repetitions of a transmission or a channel, allowing a receiver (e.g., a base station) to combine the repetitions to facilitate decoding of the channel.
  • each repetition of the channel may include the same information or data.
  • the receiver is able to combine the repetitions to decode the information or data associated with the channel or transmission.
  • the repetitions may include the same information or data with different redundancy versions. For example, the same information or data may be encoded differently for the repetitions using different redundancy versions.
  • FIG. 1 depicts an example of a wireless communications system 100, in which aspects described herein may be implemented.
  • wireless communications system 100 includes base stations (BSs) 102, user equipments (UEs) 104, an Evolved Packet Core (EPC) 160, and core network 190 (e.g., a 5G Core (5GC)), which interoperate to provide wireless communications services.
  • BSs base stations
  • UEs user equipments
  • EPC Evolved Packet Core
  • core network 190 e.g., a 5G Core (5GC)
  • Base stations 102 may provide an access point to the EPC 160 and/or core network 190 for a user equipment 104, and may perform one or more of the following functions: transfer of user data, radio channel ciphering and deciphering, integrity protection, header compression, mobility control functions (e.g., handover, dual connectivity), inter-cell interference coordination, connection setup and release, load balancing, distribution for non-access stratum (NAS) messages, NAS node selection, synchronization, radio access network (RAN) sharing, multimedia broadcast multicast service (MBMS), subscriber and equipment trace, RAN information management (RIM), paging, positioning, delivery of warning messages, among other functions.
  • NAS non-access stratum
  • RAN radio access network
  • MBMS multimedia broadcast multicast service
  • RIM RAN information management
  • Base stations may include and/or be referred to as a gNB, Node B, eNB, an access point, a base transceiver station, a radio base station, a radio transceiver, or a transceiver function, or a transmit reception point (TRP) in various contexts.
  • gNB Node B
  • eNB an access point
  • base transceiver station a radio base station
  • radio transceiver or a transceiver function
  • TRP transmit reception point
  • Base stations 102 wirelessly communicate with UEs 104 via communications links 120. Each of base stations 102 may provide communication coverage for a respective geographic coverage area 110, which may overlap in some cases. For example, small cell 102’ (e.g., a low-power base station) may have a coverage area 110’ that overlaps the coverage area 110 of one or more macrocells (e.g., high-power base stations).
  • small cell 102’ e.g., a low-power base station
  • macrocells e.g., high-power base stations
  • the communication links 120 between base stations 102 and UEs 104 may include uplink (UL) (also referred to as reverse link) transmissions from a user equipment 104 to a base station 102 and/or downlink (DL) (also referred to as forward link) transmissions from a base station 102 to a user equipment 104.
  • UL uplink
  • DL downlink
  • the communication links 120 may use multiple-input and multiple-output (MIMO) antenna technology, including spatial multiplexing, beamforming, and/or transmit diversity in various aspects.
  • MIMO multiple-input and multiple-output
  • Examples of UEs 104 include a cellular phone, a smart phone, a session initiation protocol (SIP) phone, a laptop, a personal digital assistant (PDA), a satellite radio, a global positioning system, a multimedia device, a video device, a digital audio player, a camera, a game console, a tablet, a smart device, a wearable device, a vehicle, an electric meter, a gas pump, a large or small kitchen appliance, a healthcare device, an implant, a sensor/actuator, a display, or other similar devices.
  • SIP session initiation protocol
  • PDA personal digital assistant
  • UEs 104 may be internet of things (loT) devices (e.g., parking meter, gas pump, toaster, vehicles, heart monitor, or other loT devices), always on (AON) devices, or edge processing devices.
  • UEs 104 may also be referred to more generally as a station, a mobile station, a subscriber station, a mobile unit, a subscriber unit, a wireless unit, a remote unit, a mobile device, a wireless device, a wireless communications device, a remote device, a mobile subscriber station, an access terminal, a mobile terminal, a wireless terminal, a remote terminal, a handset, a user agent, a mobile client, or a client.
  • LoT internet of things
  • AON always on
  • Wireless communications system 100 includes a repetition manager 199, which may be configure a UE for repetition of a data channel for random access.
  • the repetition manager 199 may provide an indication of the slots available for uplink communication, which can be counted for repetitions of the data channel.
  • Wireless communications system 100 further includes a repetition manager 198, which may be configured to implement data channel repetition for random access.
  • the repetition manager 198 may select slots for repetitions of the data channel based on the indication of the slots available for uplink communication.
  • a base station such as BS 102, may include components that are located at a single physical location or components located at various physical locations.
  • the various components may each perform various functions such that, collectively, the various components achieve functionality that is similar to a base station that is located at a single physical location.
  • a base station may equivalently refer to a standalone base station or a base station including components that are located at various physical locations or virtualized locations.
  • a base station including components that are located at various physical locations may be referred to as or may be associated with a disaggregated radio access network (RAN) architecture, such as an Open RAN (0-RAN) or Virtualized RAN (VRAN) architecture.
  • RAN disaggregated radio access network
  • RAN disaggregated radio access network
  • VRAN Virtualized RAN
  • a base station may be a network node including one or more of a central unit (CU), a distributed unit (DU), or a radio unit (RU).
  • CU central unit
  • DU distributed unit
  • RU radio unit
  • FIG. 2 depicts aspects of an example base station (BS) 102 and a user equipment (UE) 104.
  • BS base station
  • UE user equipment
  • base station 102 includes various processors (e.g., 220, 230, 238, and 240), antennas 234a-t (collectively 234), transceivers 232a-t (collectively 232), which include modulators and demodulators, and other aspects, which enable wireless transmission of data (e.g., source data 212) and wireless reception of data (e.g., data sink 239).
  • base station 102 may send and receive data between itself and user equipment 104.
  • Base station 102 includes controller / processor 240, which may be configured to implement various functions related to wireless communications.
  • controller / processor 240 includes a repetition manager 241, which may be representative of repetition manager 199 of FIG. 1.
  • repetition manager 241 may be implemented additionally or alternatively in various other aspects of base station 102 in other implementations.
  • user equipment 104 includes various processors (e.g., 258, 264, 266, and 280), antennas 252a-r (collectively 252), transceivers 254a-r (collectively 254), which include modulators and demodulators, and other aspects, which enable wireless transmission of data (e.g., source data 262) and wireless reception of data (e.g., data sink 260).
  • processors e.g., 258, 264, 266, and 280
  • antennas 252a-r collectively 252
  • transceivers 254a-r collectively 254
  • other aspects which enable wireless transmission of data (e.g., source data 262) and wireless reception of data (e.g., data sink 260).
  • User equipment 104 includes controller / processor 280, which may be configured to implement various functions related to wireless communications.
  • controller / processor 280 includes repetition manager 281, which may be representative of repetition manager 198 of FIG. 1.
  • repetition manager 281 may be implemented additionally or alternatively in various other aspects of user equipment 104 in other implementations.
  • FIGS. 3A-3D depict aspects of data structures for a wireless communication network, such as wireless communications system 100 of FIG. 1.
  • FIG. 3A is a diagram 300 illustrating an example of a first subframe within a 5G (e.g., 5G NR.) frame structure
  • FIG. 3B is a diagram 330 illustrating an example of DL channels within a 5G subframe
  • FIG. 3C is a diagram 350 illustrating an example of a second subframe within a 5G frame structure
  • FIG. 3D is a diagram 380 illustrating an example of UL channels within a 5G subframe.
  • the UE may select slots, as depicted in FIGs. 3A-3D, for repetitions of a transmission using slots available for uplink communication, as further described herein.
  • FIG. 1, FIG. 2, and FIGS. 3A-3D are provided later in this disclosure.
  • an electromagnetic spectrum is often subdivided, into various classes, bands, channels, or other features.
  • the subdivision is often provided based on wavelength and frequency, where frequency may also be referred to as a carrier, a subcarrier, a frequency channel, a tone, or a subband.
  • FR1 frequency range designations FR1 (410 MHz - 7.125 GHz) and FR2 (24.25 GHz - 52.6 GHz). It should be understood that although a portion of FR1 is greater than 6 GHz, FR1 is often referred to (interchangeably) as a “Sub- 6 GHz” band in various documents and articles.
  • FR2 which is often referred to (interchangeably) as a “millimeter wave” band in documents and articles, despite being different from the extremely high frequency (EHF) band (30 GHz - 300 GHz) which is identified by the International Telecommunications Union (ITU) as a “millimeter wave” band.
  • EHF extremely high frequency
  • ITU International Telecommunications Union
  • FR3 7.125 GHz - 24.25 GHz
  • FR3 7.125 GHz - 24.25 GHz
  • Frequency bands falling within FR3 may inherit FR1 characteristics and/or FR2 characteristics, and thus may effectively extend features of FR1 and/or FR2 into mid-band frequencies.
  • higher frequency bands are currently being explored to extend 5G NR operation beyond 52.6 GHz.
  • FR4a or FR4-1 52.6 GHz - 71 GHz
  • FR4 52.6 GHz - 114.25 GHz
  • FR5 114.25 GHz - 300 GHz.
  • Each of these higher frequency bands falls within the EHF band.
  • sub-6 GHz or the like if used herein may broadly represent frequencies that may be less than 6 GHz, may be within FR1, or may include mid-band frequencies.
  • millimeter wave or the like if used herein may broadly represent frequencies that may include mid-band frequencies, may be within FR2, FR4, FR4-a or FR4-1, and/or FR5, or may be within the EHF band.
  • mmWave base station 180 may utilize beamforming 182 with the UE 104 to improve path loss and range.
  • base station 180 and the UE 104 may each include a plurality of antennas, such as antenna elements, antenna panels, and/or antenna arrays to facilitate the beamforming.
  • base station 180 may transmit a beamformed signal to UE 104 in one or more transmit directions 182’.
  • UE 104 may receive the beamformed signal from the base station 180 in one or more receive directions 182”.
  • UE 104 may also transmit a beamformed signal to the base station 180 in one or more transmit directions 182”.
  • Base station 180 may receive the beamformed signal from UE 104 in one or more receive directions 182’.
  • Base station 180 and UE 104 may then perform beam training to determine the best receive and transmit directions for each of base station 180 and UE 104.
  • the transmit and receive directions for base station 180 may or may not be the same.
  • the transmit and receive directions for UE 104 may or may not be the same.
  • a random-access channel is so named because it refers to a wireless channel (medium) that may be shared by multiple UEs and used by the UEs to (randomly) access the network for communications.
  • the RACH may be used for call setup and to access the network for data transmissions.
  • RACH may be used for initial access to a network when the UE switches from a radio resource control (RRC) connected idle mode to active mode, or when handing over in RRC connected mode.
  • RACH may be used for downlink (DL) and/or uplink (UL) data arrival (e.g., data transmission) when the UE is in RRC idle or RRC inactive modes, and when reestablishing a connection with the network.
  • DL downlink
  • UL uplink
  • FIG. 4 is a call-flow diagram 400 illustrating an example four-step RACH procedure, in accordance with certain aspects of the present disclosure.
  • a first message may be sent from the UE 104 to BS 102 on the physical random access channel (PRACH).
  • MSG1 may only include a RACH preamble 404.
  • BS 102 may respond with a random access response (RAR) message 406 (MSG2) which may include the identifier (ID) of the RACH preamble, a timing advance (TA), an uplink grant, cell radio network temporary identifier (C-RNTI), and a back off indicator (BI).
  • RAR random access response
  • ID the identifier
  • TA timing advance
  • C-RNTI cell radio network temporary identifier
  • BI back off indicator
  • MSG2 may include a PDCCH communication including control information for (e.g., scheduling a reception of) a following communication on the PDSCH, as illustrated.
  • MSG3 is transmitted from the UE 104 to BS 102 on the PUSCH 408.
  • MSG3 may include one or more of an RRC connection request, a tracking area update request, a system information request, a positioning fix or positioning signal request, or a scheduling request.
  • the BS 102 then responds with MSG4 which may include a contention resolution message 410.
  • the UE 104 may also receive system information 402 (e.g., also referred to herein as a system information message) indicating various communication parameters that may be used by the UE 104 for communicating with the BS 102.
  • system information 402 e.g., also referred to herein as a system information message
  • Some aspects of the present disclosure provide techniques for counting MSG3 physical uplink shared channel (PUSCH) repetitions.
  • the techniques for counting the repetitions described herein may be different than certain techniques (e.g., a repetition counting technique for 3 GPP Release- 15).
  • data channel repetition may be implemented using dynamically configured repetition counting techniques.
  • a base station may configure a UE with a number of repetitions of a transmission. Each of the repetitions may be transmitted by the UE during a slot configured for uplink (UL).
  • UL uplink
  • the UE may count every slot available for either downlink (DL) or UL communication.
  • a second repetition counting technique the UE may count only the slots available for UL transmissions, as described in more detail herein.
  • a BS may dynamically configure a UE with a repetition counting technique to be used for repetition of a PUSCH for a RACH message.
  • repetition may be implemented for PUSCH transmission (e.g., PUSCH 408 of FIG. 4) for MSG3 of a RACH procedure to enhance coverage.
  • Repetition of a channel generally refers to a technique where multiple repetitions of a channel are transmitted, allowing a receiver to combine the repetitions to facilitate decoding of the channel.
  • each repetition of the channel may include the same data.
  • the receiver is able to combine the repetitions to decode the data associated with the channel.
  • the repetitions may include the same data, yet different redundancy versions.
  • the same data may be encoded differently for the repetitions using different redundancy versions.
  • the UE is expected to count every slot beginning from the slot of first transmission as a potential slot for a repetition, irrespective of whether the slot is designated for downlink (DL) or uplink (UL), as described in more detail with respect to FIG. 5A
  • FIGs. 5A and 5B illustrate repetition counting techniques, in accordance with certain aspects of the present disclosure.
  • the slots 500 include special (S) slots that are used to facilitate switching from a DL slot to an UL slot.
  • S special
  • a repetition count of 6 also referred to herein a number of repetitions
  • the UE may count each of the slots (e.g., each of the slots in a sequence of consecutive slots) beginning from the slot of the first PUSCH transmission as a potential slot for a repetition.
  • the UE may begin the count at slot 502 (e.g., UL slot) during which the initial PUSCH may be transmitted, and the UE may also count each of slots 506, 508, 510, 512, and 504, even though the repetition of the PUSCH is only transmitted in the UL slots 502, 504. Counting repetitions in this manner can lead to over counting and a large shortfall in actual repetitions since all slots are counted (e.g., including DL slots on which PUSCH cannot be transmitted).
  • slot 502 e.g., UL slot
  • the UE may begin the count at slot 502 (e.g., UL slot) during which the initial PUSCH may be transmitted, and the UE may also count each of slots 506, 508, 510, 512, and 504, even though the repetition of the PUSCH is only transmitted in the UL slots 502, 504. Counting repetitions in this manner can lead to over counting and a large shortfall in actual repetitions since all slots are counted (e.g., including
  • some configuration changes by the network may occur in a dynamic manner that modify the frame slot pattern (e.g., drop one or more UL slots from the frame) at the UE.
  • a repetition count may be configured prior to slot 502.
  • one or more UL slots may be dynamically reconfigured (e.g., added and/or dropped from the slot pattern).
  • the UE may count every slot (including DL, UL, and S slots) for the repetition count, as described herein.
  • dynamic reconfiguration of a slot pattern by the network may not occur (or may be less likely to occur or occur infrequently).
  • a BS may dynamically configure a UE with a repetition counting technique to be applied for a configured repetition count. For instance, the UE may only count the available slots for PUSCH (e.g., slots 502, 504) for the PUSCH repetition. For example, as illustrated in FIG. 5B, a repetition count of 3 may be configured, and the UE may count only the slots 502, 504, 514 available for UL communication. The UE may transmit the PUSCH in the corresponding slots 502, 504, 514, where the slot 502 may be for the initial transmission and the slots 504, 514 may be for the repetitions of the initial transmission.
  • PUSCH e.g., slots 502, 504
  • FIG. 6 is a flow diagram illustrating example operations 600 for wireless communication, in accordance with certain aspects of the present disclosure.
  • the operations 600 may be performed, for example, by a UE (e.g., such as the UE 104 in the wireless communication system 100).
  • the operations 600 may be implemented as software components that are executed and run on one or more processors (e.g., controller/processor 280 of FIG. 2).
  • the transmission and reception of signals by the UE in operations 600 may be enabled, for example, by one or more antennas (e.g., antennas 252 of FIG. 2).
  • the transmission and/or reception of signals by the UE may be implemented via a bus interface of one or more processors (e.g., controller/processor 280) obtaining and/or outputting signals.
  • the operations 600 may begin, at block 602, with the UE determining a configuration of a number of repetitions of a channel (e.g., PUSCH) to be transmitted using a RACH message (e.g., MSG3 as described with respect to FIG. 4).
  • the UE may receive, from the base station, the configuration of the number of repetitions.
  • Each of the repetitions of the channel may be during a slot available for UL (e.g., slots 502, 504, 514 of FIG. 5B).
  • the number of repetitions may correspond to a number of the available slots to be used for the repetitions.
  • the repetition counting technique associated the configured number of repetitions may be to count only the slots available for UL, as described.
  • the UE may transmit, to a base station, the RACH message in accordance with the configuration of the number of repetitions.
  • the UE may transmit a random access preamble (e.g., MSG1 of FIG. 4), and receive a random access response (e.g., MSG2 of FIG. 4) to the random access preamble.
  • the RACH message (e.g., MSG3 of FIG. 4) may be transmitted in response to receiving the random access response.
  • the UE may also receive an indication of a repetition counting technique, and select the available slots to be used for the repetitions based on the repetition counting technique and the configuration of the number of repetitions.
  • the indication of the repetition counting technique may include an indication to count only the available slots (e.g., UL slots 502, 504, 514) for the selecting of the available slots to be used for the repetitions, or an indication to count both the available slots (e.g., UL slots 502, 504, 514) and one or more other slots (e.g., 506, 508, 510, 512) that are unavailable for UL for the selecting of the available slots to be used for the repetitions.
  • FIG. 7 is a flow diagram illustrating example operations 700 for wireless communication, in accordance with certain aspects of the present disclosure.
  • the operations 700 may be performed, for example, by a BS (e.g., such as the BS 102 in the wireless communications system 100).
  • the operations 700 may be complementary to the operations 600 performed by the UE.
  • the operations 700 may be implemented as software components that are executed and run on one or more processors (e.g., controller/processor 240 of FIG. 2).
  • the transmission and reception of signals by the BS in operations 700 may be enabled, for example, by one or more antennas (e.g., antennas 234 of FIG. 2).
  • the transmission and/or reception of signals by the BS may be implemented via a bus interface of one or more processors (e.g., controller/processor 240) obtaining and/or outputting signals.
  • the operations 700 may optionally begin, at block 702, where the BS may determine a configuration of a number of repetitions of a channel (e.g., PUSCH) to be received using a RACH message (e.g., MSG3 as described with respect to FIG. 4).
  • the BS may transmit, to the UE, the configuration of the number of repetitions for the RACH message.
  • Each of the repetitions of the channel may be during a slot available for UL (e.g., slots 502, 504, 514 of FIG. 5B).
  • the number of repetitions may correspond to a number of the available slots to be used for the repetitions.
  • the BS may receive, from the UE, the RACH message in accordance with the configuration of the number of repetitions. For example, the BS may decode the RACH message by combining the repetitions of the channel. The combined repetitions at the receiver may enhance the signal quality of the received signals associated with the RACH message.
  • FIG. 8 is a call flow diagram illustrating example techniques for PUSCH repetition during a RACH procedure 800, in accordance with certain aspects of the present disclosure.
  • counting the number of repetitions may be on the basis of available UL slots, as described.
  • a BS may indicate to the UE which technique for counting the number of MSG3 PUSCH repetitions is to be used.
  • the BS may indicate the technique (also referred to herein as a repetition counting technique as described herein with respect to FIGs. 5A and 5B) of counting MSG3 PUSCH repetitions via system information 402 (e.g. via remaining minimum system information (RMSI)), as illustrated.
  • system information 402 e.g. via remaining minimum system information (RMSI)
  • the RMSI may indicate the TDD UL/DL slot pattern, which identifies where DL slot(s), UL slot(s), and/or S slot(s) are arranged in the time domain, such as the UL/DL slot pattern depicted in FIGs. 5A and 5B.
  • the BS may transmit a physical downlink control channel (PDCCH) that schedules a physical downlink shared channel (PDSCH) for MSG2.
  • the BS may indicate the technique of counting MSG3 PUSCH repetitions via MSG2 (e.g, PDSCH of MSG2), MSG2 PDCCH, or both, as illustrated.
  • the indication of the repetition counting technique (e.g., in MSG2) may be together and/or combined with the indication of the number of MSG3 repetitions.
  • MSG2 PDCCH may indicate the repetition counting technique, whether PUSCH repetition is to be enabled, the number repetitions to be transmitted, or any combination thereof.
  • the UE may select the slots for repetition of the PUSCH on MSG3 based on the number of repetitions configured, and the configured repetition counting technique.
  • the UE may then transmit the PUSCH repetitions 408 (e.g., the repetitions of MSG3 via the PUSCH), as illustrated.
  • the BS may combine the repetitions of the PUSCH, and decode the PUSCH accordingly.
  • the UE may be configured with various options (e.g., also referred to as candidates) for the techniques of MSG3 repetition counting.
  • the candidate techniques may be specified in a standard specification.
  • the BS indicating the repetition counting technique may include indicating one of the configured candidate techniques.
  • the BS may indicate an index associated with one of the candidate techniques.
  • the candidate techniques for MSG3 repetition counting may be implied from (e.g., depend on) one or more other configurations.
  • the candidate techniques may be determined by the UE from an UL/DL duplexing method used for communication between the UE and the BS (e.g., frequency division duplex (FDD) or time division duplex (TDD)).
  • the candidate techniques may be implied from (e.g., depend on) a frequency range, subcarrier spacing, or both, configured for communications with the BS.
  • the duplexing method, frequency range, and subcarrier spacing may be configured via the system information 402, in some implementations.
  • FIG. 9 is a flow diagram illustrating example operations 900 for wireless communication, in accordance with certain aspects of the present disclosure.
  • the operations 900 may be performed, for example, by a UE (e.g., such as the UE 104 in the wireless communication system 100).
  • the operations 900 may be implemented as software components that are executed and run on one or more processors (e.g., controller/processor 280 of FIG. 2).
  • the transmission and reception of signals by the UE in operations 900 may be enabled, for example, by one or more antennas (e.g., antennas 252 of FIG. 2).
  • the transmission and/or reception of signals by the UE may be implemented via a bus interface of one or more processors (e.g., controller/processor 280) obtaining and/or outputting signals.
  • the operations 900 may optionally begin, at block 902, with the UE receiving, from a base station, an indication of a repetition counting technique.
  • the indication of the repetition counting technique may include an indication to count only available slots for selecting of the available slots to be used for the repetitions, or an indication to count both the available slots and one or more other slots that are unavailable for UL for the selecting of the available slots to be used for the repetitions.
  • the indication of the repetition counting technique comprises an indication of one of candidate repetition counting techniques, as described.
  • the UE may determine a configuration of a number of repetitions of a channel to be transmitted using a RACH message (e.g., MSG3), each of the repetitions of the channel being during a slot available for UL.
  • a RACH message e.g., MSG3
  • the UE may select the available slots to be used for the repetitions based on the repetition counting technique and the configuration of the number of repetitions.
  • the UE may transmit, to the base station, the RACH message in accordance with the selection of the available slots.
  • FIG. 10 is a flow diagram illustrating example operations 1000 for wireless communication, in accordance with certain aspects of the present disclosure.
  • the operations 1000 may be performed, for example, by a BS (e.g., such as the BS 102 in the wireless communications system 100).
  • the operations 1000 may be complementary to the operations 900 performed by the UE.
  • the operations 1000 may be implemented as software components that are executed and run on one or more processors (e.g., controller/processor 240 of FIG. 2).
  • the transmission and reception of signals by the BS in operations 1000 may be enabled, for example, by one or more antennas (e.g., antennas 234 of FIG. 2).
  • the transmission and/or reception of signals by the BS may be implemented via a bus interface of one or more processors (e.g., controller/processor 240) obtaining and/or outputting signals.
  • the operations 1000 may optionally begin, at block 1002, with the BS transmitting, to a UE, an indication of a repetition counting technique.
  • the BS may determine a configuration of a number of repetitions of a channel to be received using a RACH message, each of the repetitions of the channel being during a slot available for UL.
  • the BS may select the available slots to be used for the repetitions based on the repetition counting technique and the configuration of the number of repetitions.
  • the BS may receive, from the UE, the RACH message in accordance with the selection of the available slots.
  • FIG. 11 is a flow diagram illustrating example operations 1100 for wireless communication, in accordance with certain aspects of the present disclosure.
  • the operations 1100 may be performed, for example, by a UE (e.g., such as the UE 104 in the wireless communication system 100).
  • the operations 1100 may be implemented as software components that are executed and run on one or more processors (e.g., controller/processor 280 of FIG. 2).
  • the transmission and reception of signals by the UE in operations 1100 may be enabled, for example, by one or more antennas (e.g., antennas 252 of FIG. 2).
  • the transmission and/or reception of signals by the UE may be implemented via a bus interface of one or more processors (e.g., controller/processor 280) obtaining and/or outputting signals.
  • the operations 1100 may optionally begin, at block 1102, where the UE may receive a first indication of one or more first slots (e.g., slots 502, 504, 514) that are counted for one or more repetitions (e.g., the PUSCH repetitions depicted in FIG. 8) of a RACH message (e.g., MSG3) and a second indication of a number of the one or more repetitions.
  • a first indication of one or more first slots e.g., slots 502, 504, 514
  • a RACH message e.g., MSG3
  • Each of the repetitions of the RACH message may be during a slot available for uplink communication, for example, as depicted in FIG. 5B.
  • the UE may transmit, to a base station (e.g., the BS 102), the RACH message and the repetitions in accordance with the first indication and the second indication.
  • the UE may transmit the RACH message and the repetitions via a PUSCH.
  • the first indication and/or second indication may be received via multiple messages.
  • the UE may receive a system information message (e.g., the system information 402) indicating one or more second slots available for uplink communication.
  • the system information message may include a RMSI, which may provide at least a TDD UL/DL frame slot pattern as illustrated in FIGs. 5A and 5B.
  • the UE may receive a random access response (e.g., MSG2) indicating an uplink grant, which may provide the time domain resource allocation for the slots used for the repetitions.
  • the first indication may be based on the second slots available for uplink communication as indicated in the system information message and the uplink grant as indicated in the random access response.
  • the UE may receive the second indication via the random access response (e.g., MSG2), for example, as described herein with respect to FIG. 8.
  • MSG2 the random access response
  • the RACH message may be MSG3 in a four-step RACH procedure, for example, as described herein with respect to FIGs. 4 and 8.
  • the UE may transmit a random access preamble (e.g., the RACH preamble 404).
  • the UE may receive the random access response (e.g., MSG2) in response to the random access preamble, and the UE may transmit the RACH message (e.g., MSG3) and the repetitions in response to the random access response.
  • the UE may select one or more third slots to be used for the one or more repetitions based on the first indication and the second indication. For example, the UE may select the third slots among the second slots available for uplink communication and the slots allocated in the uplink grant for the repetitions based on the number of repetitions.
  • the slots allocated in the uplink grant may be a portion of the second slots available for uplink communication, and the number of repetitions may provide the number of slots to use from the portion of the second slots available for uplink communication.
  • the UE may transmit the repetitions in the third slots.
  • the first indication may include an indication to count only the second slots available for uplink communication, such as the counting technique described herein with respect to FIG. 5B. In certain cases, the first indication may include an indication to count both the second slots available for uplink communication and one or more other slots that are unavailable for uplink communication, such as the counting technique described herein with respect to FIG. 5A.
  • the UE may determine the first slots that are counted for the repetitions based at least in part on various criteria. In certain cases, the UE may determine the first slots that are counted for the repetitions based at least in part on an uplink-downlink duplexing procedure (e.g., TDD), frequency range, or subcarrier spacing associated with communication with the base station.
  • TDD uplink-downlink duplexing procedure
  • FIG. 12 is a flow diagram illustrating example operations 1200 for wireless communication, in accordance with certain aspects of the present disclosure.
  • the operations 1200 may be performed, for example, by a BS (e.g., such as the BS 102 in the wireless communications system 100).
  • the operations 1200 may be complementary to the operations 1100 performed by the UE.
  • the operations 1200 may be implemented as software components that are executed and run on one or more processors (e.g., controller/processor 240 of FIG. 2).
  • the transmission and reception of signals by the BS in operations 1200 may be enabled, for example, by one or more antennas (e.g., antennas 234 of FIG. 2).
  • the transmission and/or reception of signals by the BS may be implemented via a bus interface of one or more processors (e.g., controller/processor 240) obtaining and/or outputting signals.
  • the operations 1200 may optionally begin, at block 1202, where the BS may transmit, to a UE (e.g., the UE 104), a first indication of one or more first slots that are counted for one or more repetitions of a random access channel (RACH) message and a second indication of a number of the one or more repetitions, each of the one or more repetitions of the RACH message being during a slot available for uplink communication.
  • a UE e.g., the UE 104
  • RACH random access channel
  • the BS may receive, from the UE, at least one of the RACH message or the repetitions in accordance with the first indication and the second indication.
  • the BS may receive at least one of the RACH message or the repetitions via a PUSCH.
  • the first indication and/or second indication may be transmitted via multiple messages.
  • the BS may transmit a system information message (e.g., the system information 402) indicating one or more second slots available for uplink communication, and at block 1208, the BS may transmit a random access response (e.g., MSG2) indicating an uplink grant.
  • the system information message may include RMSI.
  • the first indication may be based on the second slots available for uplink communication as indicated in the system information message and the uplink grant as indicated in the random access response.
  • the BS may also transmit the second indication via the random access response.
  • the RACH message may be MSG3 in a four-step RACH procedure, for example, as described herein with respect to FIGs. 4 and 8.
  • the BS may receive a random access preamble (e.g., the RACH preamble 404).
  • the BS may transmit the random access response (e.g., MSG2) in response to the random access preamble, and the BS may receive the RACH message (e.g., MSG3) and/or the repetitions in response to the random access response.
  • the BS may select one or more third slots to be used for the one or more repetitions based on the first indication and the second indication, for example, as described herein with respect to the operations 1100.
  • the BS may monitor for and/or receive the repetitions in the one or more third slots.
  • the first indication may include an indication to count only the second slots available for uplink communication, such as the counting technique described herein with respect to FIG. 5B. In certain cases, the first indication may include an indication to count both the second slots available for uplink communication and one or more other slots that are unavailable for uplink communication, such as the counting technique described herein with respect to FIG. 5A.
  • the BS may determine the first slots that are counted for the repetitions based at least in part on an uplink-downlink duplexing procedure (e.g., TDD), frequency range, or subcarrier spacing associated with communication with the UE.
  • TDD uplink-downlink duplexing procedure
  • FIG. 13 depicts an example communications device 1300 that includes various components operable, configured, or adapted to perform operations for the techniques disclosed herein, such as the operations depicted and described with respect to FIGs. 7, 10, and 12.
  • communication device 1300 may be a base station 102 as described, for example with respect to FIGS. 1 and 2.
  • Communications device 1300 includes a processing system 1302 coupled to a transceiver 1308 (e.g., a transmitter and/or a receiver).
  • Transceiver 1308 is configured to transmit (or send) and receive signals for the communications device 1300 via an antenna 1310, such as the various signals as described herein.
  • Processing system 1302 may be configured to perform processing functions for communications device 1300, including processing signals received and/or to be transmitted by communications device 1300.
  • Processing system 1302 includes one or more processors 1320 coupled to a computer-readable medium/memory 1330 via a bus 1306.
  • computer- readable medium/memory 1330 is configured to store instructions (e.g., computerexecutable code) that when executed by the one or more processors 1320, cause the one or more processors 1320 to perform the operations illustrated in FIGs. 7, 10, and 12, or other operations for performing the various techniques discussed herein for channel repetition.
  • computer-readable medium/memory 1330 stores code 1331 for determining, code 1332 for transmitting and receiving.
  • Computer-readable medium/memory 1330 may optionally also include code 1333 for selecting.
  • the one or more processors 1320 include circuitry configured to implement the code stored in the computer-readable medium/memory 1330, including circuitry 1321 for determining, circuitry 1322 for transmitting and receiving.
  • the one or more processors 1320 may optionally also include circuitry 1323 for selecting.
  • Various components of communications device 1300 may provide means for performing the methods described herein, including with respect to FIGs. 7, 10, and 12.
  • means for transmitting or sending may include the transceivers 232 and/or antenna(s) 234 of the base station 102 illustrated in FIG. 2 and/or transceiver 1308 and antenna 1310 of the communication device 1300 in FIG. 13.
  • means for receiving may include the transceivers 232 and/or antenna(s) 234 of the base station illustrated in FIG. 2 and/or transceiver 1308 and antenna 1310 of the communication device 1300 in FIG. 13.
  • means for transmitting, means for receiving, means for determining, and means for selecting may include various processing system components, such as: the one or more processors 1320 in FIG. 13, or aspects of the base station 102 depicted in FIG. 2, including receive processor 238, transmit processor 220, TX MIMO processor 230, and/or controller/processor 240 (including repetition manager 241).
  • FIG. 13 is an example, and many other examples and configurations of communication device 1300 are possible.
  • FIG. 14 depicts an example communications device 1400 that includes various components operable, configured, or adapted to perform operations for the techniques disclosed herein, such as the operations depicted and described with respect to FIGs. 6, 9, and 11.
  • communication device 1400 may be a user equipment 104 as described, for example with respect to FIGS. 1 and 2.
  • Communications device 1400 includes a processing system 1402 coupled to a transceiver 1408 (e.g., a transmitter and/or a receiver).
  • Transceiver 1408 is configured to transmit (or send) and receive signals for the communications device 1400 via an antenna 1410, such as the various signals as described herein.
  • Processing system 1402 may be configured to perform processing functions for communications device 1400, including processing signals received and/or to be transmitted by communications device 1400.
  • Processing system 1402 includes one or more processors 1420 coupled to a computer-readable medium/memory 1430 via a bus 1406.
  • computer- readable medium/memory 1430 is configured to store instructions (e.g., computerexecutable code) that when executed by the one or more processors 1420, cause the one or more processors 1420 to perform the operations illustrated in FIGs. 6, 9, and 11, or other operations for performing the various techniques discussed herein for channel repetition.
  • computer-readable medium/memory 1430 stores code 1431 for determining, code 1432 for transmitting and receiving.
  • Computer-readable medium/memory 1430 may optionally also include code 1433 for selecting.
  • the one or more processors 1420 include circuitry configured to implement the code stored in the computer-readable medium/memory 1430, including circuitry 1421 for determining, circuitry 1422 for transmitting and receiving.
  • the one or more processors 1420 may optionally also include circuitry 1423 for selecting.
  • Various components of communications device 1400 may provide means for performing the methods described herein, including with respect to FIGs. 6, 9, and 11.
  • means for transmitting or sending may include the transceivers 254 and/or antenna(s) 252 of the user equipment 104 illustrated in FIG. 2 and/or transceiver 1408 and antenna 1410 of the communication device 1400 in FIG. 14.
  • means for receiving may include the transceivers 254 and/or antenna(s) 252 of the user equipment 104 illustrated in FIG. 2 and/or transceiver 1408 and antenna 1410 of the communication device 1400 in FIG. 14.
  • means for transmitting, means for receiving, means for determining, and means for selecting may include various processing system components, such as: the one or more processors 1420 in FIG. 14, or aspects of the user equipment 104 depicted in FIG. 2, including receive processor 258, transmit processor 264, TX MIMO processor 266, and/or controller/processor 280 (including repetition manager 281).
  • FIG. 14 is an example, and many other examples and configurations of communication device 1400 are possible.
  • a method for wireless communication by a user-equipment comprising: determining a configuration of a number of repetitions of a channel to be transmitted using a random access channel (RACH) message, each of the repetitions of the channel being during a slot available for uplink (UL), wherein the number of repetitions corresponds to a number of the available slots to be used for the repetitions; and transmitting, to a base station, the RACH message in accordance with the configuration of the number of repetitions.
  • RACH random access channel
  • Aspect 2 The method of aspect 1, further comprising receiving, from the base station, the configuration of the number of repetitions.
  • Aspect 3 The method of any of aspects 1-2, wherein the channel comprises a physical uplink shared channel (PUSCH).
  • PUSCH physical uplink shared channel
  • Aspect 4 The method of any of aspects 1-3, further comprising: transmitting a random access preamble; and receiving a random access response to the random access preamble, wherein the RACH message is transmitted in response to receiving the random access response.
  • Aspect 5 The method of any of aspects 1-4, further comprising: receiving an indication of a repetition counting technique; and selecting the available slots to be used for the repetitions based on the repetition counting technique and the configuration of the number of repetitions.
  • Aspect 6 The method of aspect 5, wherein the indication of the repetition counting technique comprises: an indication to count only the available slots for the selecting of the available slots to be used for the repetitions; or an indication to count both the available slots and one or more other slots that are unavailable for UL for the selecting of the available slots to be used for the repetitions.
  • Aspect 7 The method of any of aspects 5-6, wherein the indication of the repetition counting technique is received via a system information message.
  • Aspect 8 The method of any of aspects 5-7, further comprising: transmitting a random access preamble; and receiving a random access response to the random access preamble, wherein the indication of the repetition counting technique is received via the random access response.
  • Aspect 9 The method of any of aspects 5-8, further comprising: transmitting a random access preamble; and receiving a control channel scheduling reception of a random access response to the random access preamble, wherein the indication of the repetition counting technique is received via the control channel.
  • Aspect 10 The method of any of aspects 5-9, wherein the indication of the repetition counting technique comprises an indication of one of candidate repetition counting techniques.
  • Aspect 11 The method of aspect 10, further comprising determining the candidate repetition counting techniques based on an UL or downlink (DL) duplexing method, frequency range, or subcarrier spacing associated with communication with the base station.
  • DL downlink
  • a method for wireless communication by a user-equipment comprising: receiving, from a base station, an indication of a repetition counting technique; determining a configuration of a number of repetitions of a channel to be transmitted using a random access channel (RACH) message, each of the repetitions of the channel being during a slot available for uplink (UL); selecting the available slots to be used for the repetitions based on the repetition counting technique and the configuration of the number of repetitions; and transmitting, to the base station, the RACH message in accordance with the selection of the available slots.
  • RACH random access channel
  • Aspect 13 The method of aspect 12, further comprising receiving, from the base station, the configuration of the number of repetitions.
  • Aspect 14 The method of any of aspects 12-13, wherein the channel comprises a schedule physical uplink shared channel (PUSCH).
  • PUSCH physical uplink shared channel
  • Aspect 15 The method of any of aspects 12-14, further comprising: transmitting a random access preamble; and receiving a random access response to the random access preamble, wherein the RACH message is transmitted in response to receiving the random access response.
  • Aspect 16 The method of any of aspects 12-15, wherein the indication of the repetition counting technique comprises: an indication to count only the available slots for the selecting of the available slots to be used for the repetitions; or an indication to count both the available slots and one or more other slots that are unavailable for UL for the selecting of the available slots to be used for the repetitions.
  • Aspect 17 The method of any of aspects 12-16, wherein the indication of the repetition counting technique is received via a system information message.
  • Aspect 18 The method of any of aspects 12-17, further comprising: transmitting a random access preamble; and receiving a random access response to the random access preamble, wherein the indication of the repetition counting technique is received via the random access response.
  • Aspect 19 The method of any of aspects 12-18, further comprising: transmitting a random access preamble; and receiving a control channel scheduling reception of a random access response to the random access preamble, wherein the indication of the repetition counting technique is received via the control channel.
  • Aspect 20 The method of any of aspects 12-19, wherein the indication of the repetition counting technique comprises an indication of one of candidate repetition counting techniques.
  • Aspect 21 The method of aspect 20, further comprising determining the candidate repetition counting techniques based on an UL or downlink (DL) duplexing method, frequency range, or subcarrier spacing associated with communication with the base station.
  • DL downlink
  • a method for wireless communication by a base station comprising: determining a configuration of a number of repetitions of a channel to be received using a random access channel (RACH) message, each of the repetitions of the channel being during a slot available for uplink (UL), wherein the number of repetitions corresponds to a number of the available slots to be used for the repetitions; and receiving, from a user-equipment (UE), the RACH message in accordance with the configuration of the number of repetitions.
  • RACH random access channel
  • Aspect 23 The method of aspect 22, further comprising transmitting, to the UE, the configuration of the number of repetitions.
  • Aspect 24 The method of any of aspects 22-23, wherein the channel comprises a physical uplink shared channel (PUSCH).
  • PUSCH physical uplink shared channel
  • Aspect 25 The method of any of aspects 22-24, further comprising: receiving a random access preamble; and transmitting a random access response to the random access preamble, wherein the RACH message is transmitted in response to receiving the random access response.
  • Aspect 26 The method of any of aspects 22-25, further comprising: transmitting an indication of a repetition counting technique; and selecting the available slots to be used for the repetitions based on the repetition counting technique and the configuration of the number of repetitions.
  • Aspect 27 The method of aspect 26, wherein the indication of the repetition counting technique comprises: an indication to count only the available slots for the selecting of the available slots to be used for the repetitions; or an indication to count both the available slots and one or more other slots that are unavailable for UL for the selecting of the available slots to be used for the repetitions.
  • Aspect 28 The method of any of aspects 26-27, wherein the indication of the repetition counting technique is transmitted via a system information message.
  • Aspect 29 The method of any of aspects 26-28, further comprising: receiving a random access preamble; and transmitting a random access response to the random access preamble, wherein the indication of the repetition counting technique is transmitted via the random access response.
  • Aspect 30 The method of any of aspects 26-29, further comprising: receiving a random access preamble; and transmitting a control channel scheduling reception of a random access response to the random access preamble, wherein the indication of the repetition counting technique is transmitted via the control channel.
  • Aspect 31 The method of any one of aspects 26-30, wherein the indication of the repetition counting technique comprises an indication of one of candidate repetition counting techniques.
  • Aspect 32 The method of aspect 31, further comprising determining the candidate repetition counting techniques based on an UL or downlink (DL) duplexing method, frequency range, or subcarrier spacing associated with communication with the base station.
  • DL downlink
  • a method for wireless communication by a base station comprising: transmitting, to a user-equipment (UE), an indication of a repetition counting technique; determining a configuration of a number of repetitions of a channel to be received using a random access channel (RACH) message, each of the repetitions of the channel being during a slot available for uplink (UL); selecting the available slots to be used for the repetitions based on the repetition counting technique and the configuration of the number of repetitions; and receiving, from the UE, the RACH message in accordance with the selection of the available slots.
  • RACH random access channel
  • Aspect 34 The method of aspect 33, further comprising transmitting, to the UE, the configuration of the number of repetitions.
  • Aspect 35 The method of any of aspects 33-34, wherein the channel comprises a schedule physical uplink shared channel (PUSCH).
  • PUSCH schedule physical uplink shared channel
  • Aspect 36 The method of any of aspects 33-45, further comprising: receiving a random access preamble; and transmitting a random access response to the random access preamble, wherein the RACH message is transmitted in response to transmitted the random access response.
  • Aspect 37 The method of any of aspects 33-36, wherein the indication of the repetition counting technique comprises: an indication to count only the available slots for the selecting of the available slots to be used for the repetitions; or an indication to count both the available slots and one or more other slots that are unavailable for UL for the selecting of the available slots to be used for the repetitions.
  • Aspect 38 The method of any of aspects 33-37, wherein the indication of the repetition counting technique is transmitted via a system information message.
  • Aspect 39 The method of any of aspects 33-38, further comprising: receiving a random access preamble; and transmitting a random access response to the random access preamble, wherein the indication of the repetition counting technique is transmitted via the random access response.
  • Aspect 40 The method of any of aspects 33-39, further comprising: receiving a random access preamble; and transmitting a control channel scheduling reception of a random access response to the random access preamble, wherein the indication of the repetition counting technique is transmitted via the control channel.
  • Aspect 41 The method of any of aspects 33-40, wherein the indication of the repetition counting technique comprises an indication of one of candidate repetition counting techniques.
  • Aspect 42 The method of aspect 41, further comprising determining the candidate repetition counting techniques based on an UL or downlink (DL) duplexing method, frequency range, or subcarrier spacing associated with communication with the base station.
  • DL downlink
  • Aspect 43 An apparatus for wireless communication, comprising: a memory; and a processor coupled to the memory, the processor being configured to: receive a first indication of one or more first slots that are counted for one or more repetitions of a random access channel (RACH) message and a second indication of a number of the one or more repetitions, each of the one or more repetitions of the RACH message being during a slot available for uplink communication, and transmit, to a base station, the RACH message and the one or more repetitions in accordance with the first indication and the second indication.
  • RACH random access channel
  • Aspect 44 The apparatus of Aspect 43, wherein the processor is further configured to: receive a system information message indicating one or more second slots available for uplink communication; and receive a random access response indicating an uplink grant, wherein the first indication is based on the one or more second slots available for uplink communication as indicated in the system information message and the uplink grant as indicated in the random access response.
  • Aspect 45 The apparatus of Aspect 44, wherein the processor is further configured to receive the second indication via the random access response.
  • Aspect 46 The apparatus of Aspect 44 or 45, wherein the processor is further configured to: transmit a random access preamble; and receive the random access response in response to the random access preamble.
  • Aspect 47 The apparatus according to any of Aspects 44-46, wherein the system information message includes remaining minimum system information (RMSI).
  • RMSI remaining minimum system information
  • Aspect 48 The apparatus according to any of Aspects 43-47, wherein the processor is further configured to: select one or more third slots to be used for the one or more repetitions based on the first indication and the second indication; and transmit the one or more repetitions in the one or more third slots.
  • Aspect 49 The apparatus of Aspect 43 or 48, wherein the processor is further configured to: transmit a random access preamble; receive a random access response in response to the random access preamble; and transmit the RACH message and the one or more repetitions in response to the random access response.
  • Aspect 50 The apparatus according to any of Aspects 43-49, wherein the processor is further configured to transmit the RACH message and the one or more repetitions via a physical uplink shared channel (PUSCH).
  • PUSCH physical uplink shared channel
  • Aspect 51 The apparatus according to any of Aspects 44-50, wherein the first indication comprises: an indication to count only the one or more second slots available for uplink communication; or an indication to count both the one or more second slots available for uplink communication and one or more other slots that are unavailable for uplink communication.
  • Aspect 52 The apparatus according to any of Aspects 43-51, wherein the processor is further configured to determine the one or more first slots that are counted for the one or more repetitions based at least in part on an uplink-downlink duplexing procedure, frequency range, or subcarrier spacing associated with communication with the base station.
  • Aspect 53 An apparatus for wireless communication, comprising: a memory; and a processor coupled to the memory, the processor being configured to: transmit a first indication of one or more first slots that are counted for one or more repetitions of a random access channel (RACH) message and a second indication of a number of the one or more repetitions, each of the one or more repetitions of the RACH message being during a slot available for uplink communication, and receive, from a user equipment (UE), at least one of the RACH message or the one or more repetitions in accordance with the first indication and the second indication.
  • RACH random access channel
  • Aspect 54 The apparatus of Aspect 53, wherein the processor is further configured to: transmit a system information message indicating one or more second slots available for uplink communication; and transmit a random access response indicating an uplink grant, wherein the first indication is based on the one or more second slots available for uplink communication as indicated in the system information message and the uplink grant as indicated in the random access response.
  • Aspect 55 The apparatus of Aspect 54, wherein the processor is further configured to transmit the second indication via the random access response.
  • Aspect 56 The apparatus of Aspect 54 or 55, wherein the processor is further configured to: receive a random access preamble; and transmit the random access response in response to the random access preamble.
  • Aspect 57 The apparatus according to any of Aspects 54-56, wherein the system information message includes remaining minimum system information (RMSI).
  • RMSI remaining minimum system information
  • Aspect 58 The apparatus according to any of Aspect 53-57, wherein the processor is further configured to: select one or more third slots to be used for the one or more repetitions based on the first indication and the second indication; and receive the one or more repetitions in the one or more third slots.
  • Aspect 59 The apparatus of Aspect 53 or 58, wherein the processor is further configured to: receive a random access preamble; transmit a random access response in response to the random access preamble; and receive at least one of the RACH message or the one or more repetitions in response to the random access response.
  • Aspect 60 The apparatus according to any of Aspects 53-59, wherein the processor is further configured to receive at least one of the RACH message or the one or more repetitions via a physical uplink shared channel (PUSCH).
  • PUSCH physical uplink shared channel
  • Aspect 61 The apparatus according to any of Aspect 54-60, wherein the first indication comprises: an indication to count only the one or more second slots available for uplink communication; or an indication to count both the one or more second slots available for uplink communication and one or more other slots that are unavailable for uplink communication.
  • Aspect 62 The apparatus according to any of Aspects 53-61, wherein the processor is further configured to determine the one or more first slots that are counted for the one or more repetitions based at least in part on an uplink-downlink duplexing procedure, frequency range, or subcarrier spacing associated with communication with the UE.
  • a method for wireless communication by a user equipment comprising: receiving a first indication of one or more first slots that are counted for one or more repetitions of a random access channel (RACH) message and a second indication of a number of the one or more repetitions, each of the repetitions of the RACH message being during a slot available for uplink communication; and transmitting, to abase station, the RACH message and the one or more repetitions in accordance with the first indication and the second indication.
  • RACH random access channel
  • Aspect 64 The method of Aspect 63, wherein receiving the first indication and the second indication comprises: receiving a system information message indicating one or more second slots available for uplink communication; and receiving a random access response indicating an uplink grant, wherein the first indication is based on the one or more second slots available for uplink communication as indicated in the system information message and the uplink grant as indicated in the random access response.
  • Aspect 65 The method of Aspect 64, wherein receiving the first indication and the second indication further comprises receiving the second indication via the random access response.
  • Aspect 66 The method of Aspect 64 or 65, further comprising: transmitting a random access preamble; selecting one or more third slots to be used for the one or more repetitions based on the first indication and the second indication; wherein receiving the random access response comprises receiving the random access response in response to the random access preamble; and wherein transmitting the one or more repetitions comprises transmitting the one or more repetitions in the one or more third slots.
  • Aspect 67 The method according to any of Aspects 64-66, wherein the system information message includes remaining minimum system information (RMSI).
  • RMSI remaining minimum system information
  • a method for wireless communication by a base station comprising: transmitting a first indication of one or more first slots that are counted for one or more repetitions of a random access channel (RACH) message and a second indication of a number of the one or more repetitions, each of the one or more repetitions of the RACH message being during a slot available for uplink communication; and receiving, from a user equipment (UE), at least one of the RACH message or the one or more repetitions in accordance with the first indication and the second indication.
  • RACH random access channel
  • Aspect 69 The method of Aspect 68, wherein transmitting the first indication and the second indication comprises: transmitting a system information message indicating one or more second slots available for uplink communication; and transmitting a random access response indicating an uplink grant, wherein the first indication is based on the one or more second slots available for uplink communication as indicated in the system information message and the uplink grant as indicated in the random access response.
  • Aspect 70 The method of Aspect 69, wherein transmitting the first indication and the second indication further comprises transmitting the second indication via the random access response.
  • Aspect 71 The method of Aspect 69 or 70, further comprising: receiving a random access preamble; selecting one or more third slots to be used for the one or more repetitions based on the first indication and the second indication; wherein transmitting the random access response comprises transmitting the random access response in response to the random access preamble; and wherein receiving the one or more repetitions comprises receiving the one or more repetitions in the one or more third slots.
  • Aspect 72 The method according to any of Aspects 69-71 , wherein the system information message includes remaining minimum system information (RMSI).
  • RMSI remaining minimum system information
  • Aspect 73 An apparatus, comprising: a memory and one or more processors coupled to the memory, the one or more processors being configured to perform a method in accordance with any of aspects 1-42 or 63-72.
  • Aspect 74 An apparatus, comprising means for performing a method in accordance with any of aspects 1-42 or 63-72.
  • Aspect 75 A non-transitory computer-readable medium comprising executable instructions that, when executed by one or more processors of an apparatus, cause the apparatus to perform a method in accordance with any of aspects 1-42 or 63- 72.
  • the techniques and methods described herein may be used for various wireless communications networks (or wireless wide area network (WWAN)) and radio access technologies (RATs). While aspects may be described herein using terminology commonly associated with 3G, 4G, and/or 5G (e.g., 5G new radio (NR)) wireless technologies, aspects of the present disclosure may likewise be applicable to other communication systems and standards not explicitly mentioned herein.
  • WWAN wireless wide area network
  • RATs radio access technologies
  • 5G wireless communication networks may support various advanced wireless communication services, such as enhanced mobile broadband (eMBB), millimeter wave (mmWave), machine type communications (MTC), and/or mission critical targeting ultra-reliable, low-latency communications (URLLC). These services, and others, may include latency and reliability requirements.
  • eMBB enhanced mobile broadband
  • mmWave millimeter wave
  • MTC machine type communications
  • URLLC mission critical targeting ultra-reliable, low-latency communications
  • the term “cell” can refer to a coverage area of a Node B (NB) and/or a NB subsystem serving this coverage area, depending on the context in which the term is used.
  • NB Node B
  • BS next generation NodeB
  • AP access point
  • DU distributed unit
  • TRP transmission reception point
  • a BS may provide communication coverage for a macro cell, a pico cell, a femto cell, and/or other types of cells.
  • a macro cell may generally 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 an association with the femto cell (e.g., UEs in a Closed Subscriber Group (CSG) and UEs for users in the home).
  • 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.
  • Base stations 102 configured for 4G LTE may interface with the EPC 160 through first backhaul links 132 (e.g., an SI interface).
  • Base stations 102 configured for 5G e.g., 5G NR or Next Generation RAN (NG-RAN)
  • NG-RAN Next Generation RAN
  • Base stations 102 may communicate directly or indirectly (e.g., through the EPC 160 or core network 190) with each other over third backhaul links 134 (e.g., X2 interface).
  • Third backhaul links 134 may generally be wired or wireless.
  • Small cell 102’ may operate in a licensed and/or an unlicensed frequency spectrum. When operating in an unlicensed frequency spectrum, the small cell 102’ may employ NR and use the same 5 GHz unlicensed frequency spectrum as used by the WiFi AP 150. Small cell 102’, employing NR in an unlicensed frequency spectrum, may boost coverage to and/or increase capacity of the access network.
  • Some base stations may operate in a traditional sub- 6 GHz spectrum, in millimeter wave (mmWave) frequencies, and/or near mmWave frequencies in communication with the UE 104.
  • mmWave millimeter wave
  • the base station 180 may be referred to as an mmWave base station or mmWave gNB.
  • the communication links 120 between base stations 102 and, for example, UEs 104, may be through one or more carriers.
  • base stations 102 and UEs 104 may use spectrum up to T MHz (e.g., 5, 10, 15, 20, 100, 400, and other MHz) bandwidth per carrier allocated in a carrier aggregation of up to a total of Ex MHz (x component carriers) used for transmission in each direction.
  • the carriers may or may not be adjacent to each other. Allocation of carriers may be asymmetric with respect to DL and UL (e.g., more or fewer carriers may be allocated for DL than for UL).
  • the component carriers may include a primary component carrier and one or more secondary component carriers.
  • a primary component carrier may be referred to as a primary cell (PCell) and a secondary component carrier may be referred to as a secondary cell (SCell).
  • PCell primary cell
  • SCell secondary cell
  • Wireless communications system 100 further includes a Wi-Fi access point (AP) 150 in communication with Wi-Fi stations (STAs) 152 via communication links 154 in, for example, a 2.4 GHz and/or 5 GHz unlicensed frequency spectrum.
  • AP Wi-Fi access point
  • STAs Wi-Fi stations
  • communication links 154 in, for example, a 2.4 GHz and/or 5 GHz unlicensed frequency spectrum.
  • the STAs 152 / AP 150 may perform a clear channel assessment (CCA) prior to communicating in order to determine whether the channel is available.
  • CCA clear channel assessment
  • D2D communication link 158 may use the DL/UL WWAN spectrum.
  • the D2D communication link 158 may use one or more sidelink channels, such as a physical sidelink broadcast channel (PSBCH), a physical sidelink discovery channel (PSDCH), a physical sidelink shared channel (PSSCH), and a physical sidelink control channel (PSCCH).
  • PSBCH physical sidelink broadcast channel
  • PSDCH physical sidelink discovery channel
  • PSSCH physical sidelink shared channel
  • PSCCH physical sidelink control channel
  • D2D communication may be through a variety of wireless D2D communications systems, such as for example, FlashLinQ, WiMedia, Bluetooth, ZigBee, Wi-Fi based on the IEEE 802.11 standard, 4G (e.g., LTE), or 5G (e.g., NR), to name a few options.
  • wireless D2D communications systems such as for example, FlashLinQ, WiMedia, Bluetooth, ZigBee, Wi-Fi based on the IEEE 802.11 standard, 4G (e.g., LTE), or 5G (e.g., NR), to name a few options.
  • EPC 160 may include a Mobility Management Entity (MME) 162, other MMEs 164, a Serving Gateway 166, a Multimedia Broadcast Multicast Service (MBMS) Gateway 168, a Broadcast Multicast Service Center (BM-SC) 170, and a Packet Data Network (PDN) Gateway 172.
  • MME 162 may be in communication with a Home Subscriber Server (HSS) 174.
  • HSS Home Subscriber Server
  • MME 162 is the control node that processes the signaling between the UEs 104 and the EPC 160. Generally, MME 162 provides bearer and connection management.
  • IP Internet protocol
  • Serving Gateway 166 which itself is connected to PDN Gateway 172.
  • PDN Gateway 172 provides UE IP address allocation as well as other functions.
  • PDN Gateway 172 and the BM-SC 170 are connected to the IP Services 176, which may include, for example, the Internet, an intranet, an IP Multimedia Subsystem (IMS), a PS Streaming Service, and/or other IP services.
  • IMS IP Multimedia Subsystem
  • PS Streaming Service PS Streaming Service
  • BM-SC 170 may provide functions for MBMS user service provisioning and delivery.
  • BM-SC 170 may serve as an entry point for content provider MBMS transmission, may be used to authorize and initiate MBMS Bearer Services within a public land mobile network (PLMN), and may be used to schedule MBMS transmissions.
  • PLMN public land mobile network
  • MBMS Gateway 168 may be used to distribute MBMS traffic to the base stations 102 belonging to a Multicast Broadcast Single Frequency Network (MBSFN) area broadcasting a particular service, and may be responsible for session management (start/stop) and for collecting eMBMS related charging information.
  • MMSFN Multicast Broadcast Single Frequency Network
  • Core network 190 may include an Access and Mobility Management Function (AMF) 192, other AMFs 193, a Session Management Function (SMF) 194, and a User Plane Function (UPF) 195.
  • AMF 192 may be in communication with a Unified Data Management (UDM) 196.
  • UDM Unified Data Management
  • AMF 192 is generally the control node that processes the signaling between UEs 104 and core network 190. Generally, AMF 192 provides QoS flow and session management.
  • IP Services 197 may include, for example, the Internet, an intranet, an IP Multimedia Subsystem (IMS), a PS Streaming Service, and/or other IP services.
  • IMS IP Multimedia Subsystem
  • a transmit processor 220 may receive data from a data source 212 and control information from a controller/processor 240.
  • the control information may be for the physical broadcast channel (PBCH), physical control format indicator channel (PCFICH), physical hybrid ARQ indicator channel (PHICH), physical downlink control channel (PDCCH), group common PDCCH (GC PDCCH), and others.
  • the data may be for the physical downlink shared channel (PDSCH), in some examples.
  • a medium access control (MAC)-control element is a MAC layer communication structure that may be used for control command exchange between wireless nodes.
  • the MAC-CE may be carried in a shared channel such as a physical downlink shared channel (PDSCH), a physical uplink shared channel (PUSCH), or a physical sidelink shared channel (PSSCH).
  • PDSCH physical downlink shared channel
  • PUSCH physical uplink shared channel
  • PSSCH physical sidelink shared channel
  • Processor 220 may process (e.g., encode and symbol map) the data and control information to obtain data symbols and control symbols, respectively. Transmit processor 220 may also generate reference symbols, such as for the primary synchronization signal (PSS), secondary synchronization signal (SSS), PBCH demodulation reference signal (DMRS), and channel state information reference signal (CSI-RS).
  • PSS primary synchronization signal
  • SSS secondary synchronization signal
  • DMRS PBCH demodulation reference signal
  • CSI-RS channel state information reference signal
  • Transmit (TX) multiple-input multiple-output (MIMO) processor 230 may perform spatial processing (e.g., precoding) on the data symbols, the control symbols, and/or the reference symbols, if applicable, and may provide output symbol streams to the modulators (MODs) in transceivers 232a-232t.
  • Each modulator in transceivers 232a- 232t may process a respective output symbol stream (e.g., for OFDM) to obtain an output sample stream.
  • Each modulator may further process (e.g., convert to analog, amplify, filter, and upconvert) the output sample stream to obtain a downlink signal.
  • Downlink signals from the modulators in transceivers 232a-232t may be transmitted via the antennas 234a-234t, respectively.
  • antennas 252a-252r may receive the downlink signals from the BS 102 and may provide received signals to the demodulators (DEMODs) in transceivers 254a-254r, respectively.
  • Each demodulator in transceivers 254a-254r may condition (e.g., filter, amplify, downconvert, and digitize) a respective received signal to obtain input samples.
  • Each demodulator may further process the input samples (e.g., for OFDM) to obtain received symbols.
  • MIMO detector 256 may obtain received symbols from all the demodulators in transceivers 254a-254r, perform MIMO detection on the received symbols if applicable, and provide detected symbols.
  • Receive processor 258 may process (e.g., demodulate, deinterleave, and decode) the detected symbols, provide decoded data for the UE 104 to a data sink 260, and provide decoded control information to a controller/processor 280.
  • transmit processor 264 may receive and process data (e.g., for the physical uplink shared channel (PUSCH)) from a data source 262 and control information (e.g., for the physical uplink control channel (PUCCH) from the controller/processor 280. Transmit processor 264 may also generate reference symbols for a reference signal (e.g., for the sounding reference signal (SRS)). The symbols from the transmit processor 264 may be precoded by a TX MIMO processor 266 if applicable, further processed by the modulators in transceivers 254a-254r (e.g., for SC-FDM), and transmitted to BS 102.
  • data e.g., for the physical uplink shared channel (PUSCH)
  • control information e.g., for the physical uplink control channel (PUCCH) from the controller/processor 280.
  • Transmit processor 264 may also generate reference symbols for a reference signal (e.g., for the sounding reference signal (SRS)).
  • the uplink signals from UE 104 may be received by antennas 234a- t, processed by the demodulators in transceivers 232a-232t, 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 104.
  • Receive processor 238 may provide the decoded data to a data sink 239 and the decoded control information to the controller/processor 240.
  • Memories 242 and 282 may store data and program codes for BS 102 and UE 104, respectively.
  • Scheduler 244 may schedule UEs for data transmission on the downlink and/or uplink.
  • 5G may utilize orthogonal frequency division multiplexing (OFDM) with a cyclic prefix (CP) on the uplink and downlink. 5G may also support half-duplex operation using time division duplexing (TDD). OFDM and single-carrier frequency division multiplexing (SC-FDM) partition the system bandwidth into multiple orthogonal subcarriers, which are also commonly referred to as tones and bins. Each subcarrier may be modulated with data. Modulation symbols may be sent in the frequency domain with OFDM and in the time domain with SC-FDM. The spacing between adjacent subcarriers may be fixed, and the total number of subcarriers may be dependent on the system bandwidth.
  • OFDM orthogonal frequency division multiplexing
  • SC-FDM single-carrier frequency division multiplexing
  • the minimum resource allocation may be 12 consecutive subcarriers in some examples.
  • the system bandwidth may also be partitioned into subbands. For example, a subband may cover multiple RBs.
  • NR may support a base subcarrier spacing (SCS) of 15 KHz and other SCS may be defined with respect to the base SCS (e.g., 30 kHz, 60 kHz, 120 kHz, 240 kHz, and others).
  • SCS base subcarrier spacing
  • FIGS. 3A-3D depict various example aspects of data structures for a wireless communication network, such as wireless communications system 100 of FIG. 1
  • the 5G frame structure may be frequency division duplex (FDD), in which for a particular set of subcarriers (carrier system bandwidth), subframes within the set of subcarriers are dedicated for either DL or UL.
  • 5G frame structures may also be time division duplex (TDD), in which for a particular set of subcarriers (carrier system bandwidth), subframes within the set of subcarriers are dedicated for both DL and UL.
  • FDD frequency division duplex
  • TDD time division duplex
  • the 5G frame structure is assumed to be TDD, with subframe 4 being configured with slot format 28 (with mostly DL), where D is DL, U is UL, and X is flexible for use between DL/UL, and subframe 3 being configured with slot format 34 (with mostly UL). While subframes 3, 4 are shown with slot formats 34, 28, respectively, any particular subframe may be configured with any of the various available slot formats 0-61. Slot formats 0, 1 are all DL, UL, respectively. Other slot formats 2-61 include a mix of DL, UL, and flexible symbols.
  • UEs are configured with the slot format (dynamically through DL control information (DCI), or semi-statically/statically through radio resource control (RRC) signaling) through a received slot format indicator (SFI).
  • DCI DL control information
  • RRC radio resource control
  • SFI received slot format indicator
  • a frame (10 ms) may be divided into 10 equally sized subframes (1 ms). Each subframe may include one or more time slots. Subframes may also include mini-slots, which may include 7, 4, or 2 symbols. In some examples, each slot may include 7 or 14 symbols, depending on the slot configuration.
  • each slot may include 14 symbols, and for slot configuration 1, each slot may include 7 symbols.
  • the symbols on DL may be cyclic prefix (CP) OFDM (CP-OFDM) symbols.
  • the symbols on UL may be CP-OFDM symbols (for high throughput scenarios) or discrete Fourier transform (DFT) spread OFDM (DFT-s-OFDM) symbols (also referred to as single carrier frequency-division multiple access (SC-FDMA) symbols) (for power limited scenarios; limited to a single stream transmission).
  • CP cyclic prefix
  • DFT-s-OFDM discrete Fourier transform
  • SC-FDMA single carrier frequency-division multiple access
  • the number of slots within a subframe is based on the slot configuration and the numerology.
  • different numerologies (p) 0 to 5 allow for 1, 2, 4, 8, 16, and 32 slots, respectively, per subframe.
  • different numerologies 0 to 2 allow for 2, 4, and 8 slots, respectively, per subframe.
  • the subcarrier spacing and symbol length/duration are a function of the numerology.
  • the subcarrier spacing may be equal to 2 ⁇ X 15 kHz, where p is the numerology 0 to 5.
  • the symbol length/duration is inversely related to the subcarrier spacing.
  • the slot duration is 0.25 ms
  • the subcarrier spacing is 60 kHz
  • the symbol duration is approximately 16.67 ps.
  • a resource grid may be used to represent the frame structure.
  • Each time slot includes a resource block (RB) (also referred to as physical RBs (PRBs)) that extends 12 consecutive subcarriers.
  • RB resource block
  • PRBs physical RBs
  • the resource grid is divided into multiple resource elements (REs). The number of bits carried by each RE depends on the modulation scheme.
  • some of the REs carry reference (pilot) signals (RS) for a UE (e.g., UE 104 of FIGS. 1 and 2).
  • the RS may include demodulation RS (DM- RS) (indicated as Rx for one particular configuration, where lOOx is the port number, but other DM-RS configurations are possible) and channel state information reference signals (CSI-RS) for channel estimation at the UE.
  • DM- RS demodulation RS
  • CSI-RS channel state information reference signals
  • the RS may also include beam measurement RS (BRS), beam refinement RS (BRRS), and phase tracking RS (PT-RS).
  • BRS beam measurement RS
  • BRRS beam refinement RS
  • PT-RS phase tracking RS
  • FIG. 3B illustrates an example of various DL channels within a subframe of a frame.
  • the physical downlink control channel (PDCCH) carries DCI within one or more control channel elements (CCEs), each CCE including nine RE groups (REGs), each REG including four consecutive REs in an OFDM symbol.
  • a primary synchronization signal may be within symbol 2 of particular subframes of a frame.
  • the PSS is used by a UE (e.g., 104 of FIGS. 1 and 2) to determine subframe/symbol timing and a physical layer identity.
  • a secondary synchronization signal may be within symbol 4 of particular subframes of a frame.
  • the SSS is used by a UE to determine a physical layer cell identity group number and radio frame timing.
  • the UE can determine a physical cell identifier (PCI). Based on the PCI, the UE can determine the locations of the aforementioned DM-RS.
  • the physical broadcast channel (PBCH) which carries a master information block (MIB), may be logically grouped with the PSS and SSS to form a synchronization signal (SS)/PBCH block.
  • the MIB provides a number of RBs in the system bandwidth and a system frame number (SFN).
  • the physical downlink shared channel (PDSCH) carries user data, broadcast system information not transmitted through the PBCH such as system information blocks (SIBs), and paging messages.
  • SIBs system information blocks
  • some of the REs carry DM-RS (indicated as R for one particular configuration, but other DM-RS configurations are possible) for channel estimation at the base station.
  • the UE may transmit DM-RS for the physical uplink control channel (PUCCH) and DM-RS for the physical uplink shared channel (PUSCH).
  • the PUSCH DM-RS may be transmitted in the first one or two symbols of the PUSCH.
  • the PUCCH DM-RS may be transmitted in different configurations depending on whether short or long PUCCHs are transmitted and depending on the particular PUCCH format used.
  • the UE may transmit sounding reference signals (SRS).
  • the SRS may be transmitted in the last symbol of a subframe.
  • the SRS may have a comb structure, and a UE may transmit SRS on one of the combs.
  • the SRS may be used by a base station for channel quality estimation to enable frequency-dependent scheduling on the UL.
  • FIG. 3D illustrates an example of various UL channels within a subframe of a frame.
  • the PUCCH may be located as indicated in one configuration.
  • the PUCCH carries uplink control information (UCI), such as scheduling requests, a channel quality indicator (CQI), a precoding matrix indicator (PMI), a rank indicator (RI), and HARQ ACK/NACK feedback.
  • UCI uplink control information
  • the PUSCH carries data, and may additionally be used to carry a buffer status report (BSR), a power headroom report (PHR), and/or UCI. Additional Considerations
  • an apparatus may be implemented or a method may be practiced using any number of the aspects set forth herein.
  • the scope of the disclosure is intended to cover such an apparatus or method that is practiced using other structure, functionality, or structure and functionality in addition to, or other than, the various aspects of the disclosure set forth herein. It should be understood that any aspect of the disclosure disclosed herein may be embodied by one or more elements of a claim.
  • the techniques described herein may be used for various wireless communication technologies, such as 5G (e.g., 5G NR), 3GPP Long Term Evolution (LTE), LTE-Advanced (LTE-A), code division multiple access (CDMA), time division multiple access (TDMA), frequency division multiple access (FDMA), orthogonal frequency division multiple access (OFDMA), single-carrier frequency division multiple access (SC-FDMA), time division synchronous code division multiple access (TD- SCDMA), and other networks.
  • LTE Long Term Evolution
  • LTE-A LTE-Advanced
  • CDMA code division multiple access
  • TDMA time division multiple access
  • FDMA frequency division multiple access
  • OFDMA orthogonal frequency division multiple access
  • SC-FDMA single-carrier frequency division multiple access
  • TD- SCDMA time division synchronous code division multiple access
  • a CDMA network may implement a radio technology such as Universal Terrestrial Radio Access (UTRA), cdma2000, and others.
  • UTRA Universal Terrestrial Radio Access
  • UTRA includes Wideband CDMA (WCDMA) and other variants of CDMA.
  • cdma2000 covers IS-2000, IS-95 and IS-856 standards.
  • a TDMA network may implement a radio technology such as Global System for Mobile Communications (GSM).
  • GSM Global System for Mobile Communications
  • An OFDMA network may implement a radio technology such as NR (e.g. 5G RA), Evolved UTRA (E-UTRA), Ultra Mobile Broadband (UMB), IEEE 802.11 (Wi-Fi), IEEE 802.16 (WiMAX), IEEE 802.20, Flash- OFDMA, and others.
  • NR e.g. 5G RA
  • E-UTRA Evolved UTRA
  • UMB Ultra Mobile Broadband
  • IEEE 802.11 Wi-Fi
  • IEEE 802.16 WiMAX
  • IEEE 802.20 Flash- OFDMA
  • UTRA and E-UTRA are part of Universal Mobile Telecommunication System (UMTS).
  • LTE and LTE-A are releases of UMTS
  • UTRA, E-UTRA, UMTS, LTE, LTE-A and GSM are described in documents from an organization named “3rd Generation Partnership Project” (3GPP).
  • cdma2000 and UMB are described in documents from an organization named “3rd Generation Partnership Project 2” (3GPP2).
  • NR is an emerging wireless communications technology under development.
  • a general purpose processor may be a microprocessor, but in the alternative, the processor may be any commercially available processor, controller, microcontroller, or state machine.
  • a processor may also be implemented as a combination of computing devices, e.g., a combination of a DSP and a microprocessor, a plurality of microprocessors, one or more microprocessors in conjunction with a DSP core, a system on a chip (SoC), or any other such configuration.
  • SoC system on a chip
  • an example hardware configuration may comprise a processing system in a wireless node.
  • the processing system may be implemented with a bus architecture.
  • the bus may include any number of interconnecting buses and bridges depending on the specific application of the processing system and the overall design constraints.
  • the bus may link together various circuits including a processor, machine-readable media, and a bus interface.
  • the bus interface may be used to connect a network adapter, among other things, to the processing system via the bus.
  • the network adapter may be used to implement the signal processing functions of the PHY layer.
  • a user equipment see FIG.
  • a user interface e.g., keypad, display, mousejoystick, touchscreen, biometric sensor, proximity sensor, light emitting element, and others
  • the bus may also link various other circuits such as timing sources, peripherals, voltage regulators, power management circuits, and the like, which are well known in the art, and therefore, will not be described any further.
  • the processor may be implemented with one or more general-purpose and/or special-purpose processors. Examples include microprocessors, microcontrollers, DSP processors, and other circuitry that can execute software. Those skilled in the art will recognize how best to implement the described functionality for the processing system depending on the particular application and the overall design constraints imposed on the overall system.
  • the functions may be stored or transmitted over as one or more instructions or code on a computer readable medium.
  • Software shall be construed broadly to mean instructions, data, or any combination thereof, whether referred to as software, firmware, middleware, microcode, hardware description language, or otherwise.
  • Computer-readable media include both computer storage media and communication media including any medium that facilitates transfer of a computer program from one place to another.
  • the processor may be responsible for managing the bus and general processing, including the execution of software modules stored on the machine-readable storage media.
  • a computer-readable storage medium may be coupled to a processor such that the processor can read information from, and write information to, the storage medium. In the alternative, the storage medium may be integral to the processor.
  • the machine-readable media may include a transmission line, a carrier wave modulated by data, and/or a computer readable storage medium with instructions stored thereon separate from the wireless node, all of which may be accessed by the processor through the bus interface.
  • the machine- readable media, or any portion thereof, may be integrated into the processor, such as the case may be with cache and/or general register files.
  • machine-readable storage media may include, by way of example, RAM (Random Access Memory), flash memory, ROM (Read Only Memory), PROM (Programmable Read-Only Memory), EPROM (Erasable Programmable Read-Only Memory), EEPROM (Electrically Erasable Programmable Read-Only Memory), registers, magnetic disks, optical disks, hard drives, or any other suitable storage medium, or any combination thereof.
  • RAM Random Access Memory
  • ROM Read Only Memory
  • PROM PROM
  • EPROM Erasable Programmable Read-Only Memory
  • EEPROM Electrical Erasable Programmable Read-Only Memory
  • registers magnetic disks, optical disks, hard drives, or any other suitable storage medium, or any combination thereof.
  • the machine-readable media may be embodied in a computer-program product.
  • a software module may comprise a single instruction, or many instructions, and may be distributed over several different code segments, among different programs, and across multiple storage media.
  • the computer-readable media may comprise a number of software modules.
  • the software modules include instructions that, when executed by an apparatus such as a processor, cause the processing system to perform various functions.
  • the software modules may include a transmission module and a receiving module. Each software module may reside in a single storage device or be distributed across multiple storage devices.
  • a software module may be loaded into RAM from a hard drive when a triggering event occurs.
  • the processor may load some of the instructions into cache to increase access speed.
  • One or more cache lines may then be loaded into a general register file for execution by the processor.
  • a phrase referring to “at least one of’ a list of items refers to any combination of those items, including single members.
  • “at least one of: a, b, or c” is intended to cover a, b, c, a-b, a-c, b-c, and a-b-c, as well as any combination with multiples of the same element (e.g., a-a, a-a-a, a-a-b, a-a-c, a-b-b, a-c-c, b-b, b-b-b, b-b-c, c-c, and c-c-c or any other ordering of a, b, and c).
  • determining encompasses a wide variety of actions. For example, “determining” may include calculating, computing, processing, deriving, investigating, looking up (e.g., looking up in a table, a database or another data structure), ascertaining and the like. Also, “determining” may include receiving (e.g., receiving information), accessing (e.g., accessing data in a memory) and the like. Also, “determining” may include resolving, selecting, choosing, establishing and the like.
  • the methods disclosed herein comprise one or more steps or actions for achieving the methods.
  • the method steps and/or actions may be interchanged with one another without departing from the scope of the claims.
  • the order and/or use of specific steps and/or actions may be modified without departing from the scope of the claims.
  • the various operations of methods described above may be performed by any suitable means capable of performing the corresponding functions.
  • the means may include various hardware and/or software component(s) and/or module(s), including, but not limited to a circuit, an application specific integrated circuit (ASIC), or processor.
  • ASIC application specific integrated circuit

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Abstract

Certains aspects de la présente divulgation concernent des techniques de répétition de canal. Un procédé ayant valeur d'exemple et exécuté par un équipement utilisateur (UE) peut comprendre les étapes consistant à : recevoir une première indication d'un ou plusieurs premiers intervalles qui sont comptés pour une ou plusieurs répétitions d'un message d'un canal d'accès aléatoire (RACH) et une seconde indication d'un nombre desdites une ou plusieurs répétitions, chacune des répétitions du message de RACH étant effectuée pendant un intervalle disponible pour une communication en liaison montante ; et transmettre à une station de base le message de RACH et lesdites une ou plusieurs répétitions en fonction des première et seconde indications.
PCT/US2022/013361 2021-01-23 2022-01-21 Techniques de comptage de répétition de canal WO2022159734A1 (fr)

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WO2019216818A1 (fr) * 2018-05-10 2019-11-14 Telefonaktiebolaget Lm Ericsson (Publ) Mécanisme de signalisation destiné à des répétitions de canal partagé de liaison montante physique et de message

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