Classifications

• • H—ELECTRICITY
  • H04—ELECTRIC COMMUNICATION TECHNIQUE
  • H04W—WIRELESS COMMUNICATION NETWORKS
  • H04W74/00—Wireless channel access
  • H04W74/002—Transmission of channel access control information
  • H04W74/006—Transmission of channel access control information in the downlink, i.e. towards the terminal
• • H—ELECTRICITY
  • H04—ELECTRIC COMMUNICATION TECHNIQUE
  • H04W—WIRELESS COMMUNICATION NETWORKS
  • H04W72/00—Local resource management
  • H04W72/20—Control channels or signalling for resource management
  • H04W72/21—Control channels or signalling for resource management in the uplink direction of a wireless link, i.e. towards the network
• • H—ELECTRICITY
  • H04—ELECTRIC COMMUNICATION TECHNIQUE
  • H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
  • H04L5/00—Arrangements affording multiple use of the transmission path
  • H04L5/0001—Arrangements for dividing the transmission path
  • H04L5/0003—Two-dimensional division
  • H04L5/0005—Time-frequency
  • H04L5/0007—Time-frequency the frequencies being orthogonal, e.g. OFDM(A) or DMT
• • H—ELECTRICITY
  • H04—ELECTRIC COMMUNICATION TECHNIQUE
  • H04W—WIRELESS COMMUNICATION NETWORKS
  • H04W72/00—Local resource management
  • H04W72/04—Wireless resource allocation
  • H04W72/044—Wireless resource allocation based on the type of the allocated resource
  • H04W72/0453—Resources in frequency domain, e.g. a carrier in FDMA
• • 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

Definitions

• aspects of the present disclosure generally relate to wireless communication, and more particularly to techniques and apparatuses for configuring an uplink bandwidth part for a random access channel (RACH) procedure.
• RACH random access channel
• Wireless communication systems are widely deployed to provide various telecommunication services such as telephony, video, data, messaging, and broadcasts.
• Typical wireless communication systems may employ multiple-access technologies capable of supporting communication with multiple users by sharing available system resources (e.g., bandwidth, transmit power, etc.).
• multiple-access technologies include code division multiple access (CDMA) systems, time division multiple access (TDMA) systems, frequency-division multiple access (FDMA) systems, orthogonal frequency-division multiple access (OFDMA) systems, single-carrier frequency-division multiple access (SC-FDMA) systems, time division synchronous code division multiple access (TD-SCDMA) systems, and Long Term Evolution (LTE).
• LTE/LTE-Advanced is a set of enhancements to the Universal Mobile Telecommunications System (UMTS) mobile standard promulgated by the Third Generation Partnership Project (3GPP).
• UMTS Universal Mobile Telecommunications System
• a wireless communication network may include a number of base stations (BSs) that can support communication for a number of user equipment (UEs).
• a user equipment (UE) may communicate with a base station (BS) via the downlink and uplink.
• the downlink (or forward link) refers to the communication link from the BS to the UE
• the uplink (or reverse link) refers to the communication link from the UE to the BS.
• a BS may be referred to as a Node B, a gNB, an access point (AP), a radio head, a transmit receive point (TRP), a new radio (NR) BS, a 5G Node B, and/or the like.
• New radio which may also be referred to as 5G, is a set of enhancements to the LTE mobile standard promulgated by the Third Generation Partnership Project (3GPP).
• 3GPP Third Generation Partnership Project
• NR is designed to better support mobile broadband Internet access by improving spectral efficiency, lowering costs, improving services, making use of new spectrum, and better integrating with other open standards using orthogonal frequency division multiplexing (OFDM) with a cyclic prefix (CP) (CP-OFDM) on the downlink (DL), using CP-OFDM and/or SC-FDM (e.g., also known as discrete Fourier transform spread OFDM (DFT-s-OFDM)) on the uplink (UL), as well as supporting beamforming, multiple-input multiple -output (MIMO) antenna technology, and carrier aggregation.
• OFDM orthogonal frequency division multiplexing
• SC-FDM e.g., also known as discrete Fourier transform spread OFDM (DFT-s-OFDM)
• MIMO multiple-input multiple -output
• a method for wireless communication may include identifying a physical resource block (PRB) frequency location of an initial active uplink bandwidth part based at least in part on remaining minimum system information (RMSI ) received from a base station (BS), the initial active uplink bandwidth part to be used for a random access channel (RACH) procedure between the UE and the BS; and using an uplink PRB grid, established based at least in part on the physical resource block of the initial active uplink bandwidth part, for the RACH procedure between the UE and the BS.
• RMSI remaining minimum system information
• RACH random access channel
• a user equipment for wireless communication may include memory and one or more processors operatively coupled to the memory.
• the memory and the one or more processors may be configured to identify a physical resource block (PRB) frequency location of an initial active uplink bandwidth part based at least in part on remaining minimum system information (RMSI ) received from a base station (BS), the initial active uplink bandwidth part to be used for a random access channel (RACH) procedure between the UE and the BS; and use an uplink PRB grid, established based at least in part on the physical resource block of the initial active uplink bandwidth part, for the RACH procedure between the UE and the BS.
• PRB physical resource block
• RMSI remaining minimum system information
• RACH random access channel
• a non-transitory computer-readable medium may store one or more instructions for wireless communication.
• the one or more instructions when executed by one or more processors of a user equipment, may cause the one or more processors to identify a physical resource block (PRB) frequency location of an initial active uplink bandwidth part based at least in part on remaining minimum system information (RMSI ) received from a base station (BS), the initial active uplink bandwidth part to be used for a random access channel (RACH) procedure between the UE and the BS; and use an uplink PRB grid, established based at least in part on the physical resource block of the initial active uplink bandwidth part, for the RACH procedure between the UE and the BS.
• PRB physical resource block
• RMSI remaining minimum system information
• RACH random access channel
• an apparatus for wireless communication may include means for identifying a physical resource block (PRB) frequency location of an initial active uplink bandwidth part based at least in part on remaining minimum system information (RMSI ) received from a base station (BS), the initial active uplink bandwidth part to be used for a random access channel (RACH) procedure between the apparatus and the BS; and means for using an uplink PRB grid, established based at least in part on the physical resource block of the initial active uplink bandwidth part, for the RACH procedure between the apparatus and the BS.
• PRB physical resource block
• RMSI remaining minimum system information
• a method for wireless communication may include transmitting, to a user equipment (UE), a random access channel (RACH) configuration within remaining minimum system information (RMSI), the RACH configuration to be used to establish an initial active uplink bandwidth part for the UE, the initial active uplink bandwidth part to be used for a RACH procedure between the BS and the UE; and establishing an uplink physical resource block (PRB) grid for the RACH procedure based at least in part on the initial active uplink bandwidth part.
• RMSI remaining minimum system information
• a base station (BS) for wireless communication may include memory and one or more processors operatively coupled to the memory.
• the memory and the one or more processors may be configured to transmit, to a user equipment (UE), a random access channel (RACH) configuration within remaining minimum system information (RMSI), the RACH configuration to be used to establish an initial active uplink bandwidth part for the UE, the initial active uplink bandwidth part to be used for a RACH procedure between the BS and the UE; and establish an uplink physical resource block (PRB) grid for the RACH procedure based at least in part on the initial active uplink bandwidth part.
• RMSI remaining minimum system information
• a non-transitory computer-readable medium may store one or more instructions for wireless communication.
• the one or more instructions when executed by one or more processors of a base station (BS), may cause the one or more processors to transmit, to a user equipment (UE), a random access channel (RACH) configuration within remaining minimum system information (RMSI), the RACH configuration to be used to establish an initial active uplink bandwidth part for the UE, the initial active uplink bandwidth part to be used for a RACH procedure between the BS and the UE; and establish an uplink physical resource block (PRB) grid for the RACH procedure based at least in part on the initial active uplink bandwidth part.
• RMSI remaining minimum system information
• an apparatus for wireless communication may include means for transmitting, to a user equipment (UE), a random access channel (RACH) configuration within remaining minimum system information (RMSI), the RACH configuration to be used to establish an initial active uplink bandwidth part for the UE, the initial active uplink bandwidth part to be used for a RACH procedure between the apparatus and the UE; and means for establishing an uplink physical resource block (PRB) grid for the RACH procedure based at least in part on the initial active uplink bandwidth part.
• RMSI remaining minimum system information
• a method for wireless communication may include receiving remaining minimum system information (RMSI) from a base station (BS); determining an initial active uplink bandwidth part based at least in part on the RMSI; and using the initial active uplink bandwidth part for a random access channel (RACH) procedure between the UE and the BS.
• RMSI remaining minimum system information
• RACH random access channel
• a user equipment for wireless communication may include memory and one or more processors operatively coupled to the memory.
• the memory and the one or more processors may be configured to receive remaining minimum system information (RMSI) from a base station (BS); determine an initial active uplink bandwidth part based at least in part on the RMSI; and use the initial active uplink bandwidth part for a random access channel (RACH) procedure between the UE and the BS.
• RMSI remaining minimum system information
• RMSI random access channel
• a non-transitory computer-readable medium may store one or more instructions for wireless communication.
• the one or more instructions when executed by one or more processors of a user equipment (UE), may cause the one or more processors to receive remaining minimum system information (RMSI) from a base station (BS); determine an initial active uplink bandwidth part based at least in part on the RMSI; and use the initial active uplink bandwidth part for a random access channel (RACH) procedure between the UE and the BS.
• RMSI remaining minimum system information
• RMSI random access channel
• an apparatus for wireless communication may include means for receiving remaining minimum system information (RMSI) from a base station (BS); means for determining an initial active uplink bandwidth part based at least in part on the RMSI; and means for using the initial active uplink bandwidth part for a random access channel (RACH) procedure between the apparatus and the BS.
• RMSI remaining minimum system information
• RACH random access channel
• aspects generally include a method, apparatus, system, computer program product, non-transitory computer-readable medium, user equipment, base station, wireless
• FIG. 1 is a block diagram conceptually illustrating an example of a wireless communication network, in accordance with various aspects of the present disclosure.
• FIG. 2 shows a block diagram conceptually illustrating an example of a base station in communication with a user equipment (UE) in a wireless communication network, in accordance with various aspects of the present disclosure.
• UE user equipment
• FIG. 3 is a block diagram conceptually illustrating an example of a frame structure in a wireless communication network, in accordance with various aspects of the present disclosure.
• Fig. 4 is a block diagram conceptually illustrating two example subframe formats with the normal cyclic prefix, in accordance with various aspects of the present disclosure.
• Fig. 5 illustrates an example logical architecture of a distributed radio access network (RAN), in accordance with various aspects of the present disclosure.
• FIG. 6 illustrates an example physical architecture of a distributed RAN, in accordance with various aspects of the present disclosure.
• Fig. 7 is a diagram illustrating an example of a downlink (DL)-centric subframe, in accordance with various aspects of the present disclosure.
• Fig. 8 is a diagram illustrating an example of an uplink (UL)-centric subframe, in accordance with various aspects of the present disclosure.
• Fig. 9 is a diagram illustrating an example of a call flow for configuring an uplink bandwidth part for a random access channel (RACH) procedure, in accordance with various aspects of the present disclosure.
• RACH random access channel
• Fig. 10 is a diagram illustrating an example of configuring an uplink bandwidth part for a random access channel (RACH) procedure, in accordance with various aspects of the present disclosure.
• RACH random access channel
• Fig. 12 is a diagram illustrating an example of configuring an uplink bandwidth part for a random access channel (RACH) procedure, in accordance with various aspects of the present disclosure.
• RACH random access channel
• a BS for a macro cell may be referred to as a macro BS.
• a BS for a pico cell may be referred to as a pico BS.
• a BS for a femto cell may be referred to as a femto BS or a home BS.
• a BS 1 10a may be a macro BS for a macro cell 102a
• a BS 1 10b may be a pico BS for a pico cell 102b
• a BS 1 10c may be a femto BS for a femto cell 102c.
• a BS may support one or multiple (e.g., three) cells.
• the terms "eNB”, “base station”, “NR BS”, “gNB”, “TRP”, “AP”, “node B”, “5G NB”, and “cell” may be used interchangeably herein.
• a relay station may also be a UE that can relay transmissions for other UEs.
• a relay station 1 lOd may communicate with macro BS 1 10a and a UE 120d in order to facilitate communication between BS 1 10a and UE 120d.
• a relay station may also be referred to as a relay BS, a relay base station, a relay, etc.
• Wireless network 100 may be a heterogeneous network that includes BSs of different types, e.g., macro BSs, pico BSs, femto BSs, relay BSs, etc. These different types of BSs may have different transmit power levels, different coverage areas, and different impact on interference in wireless network 100.
• macro BSs may have a high transmit power level (e.g., 5 to 40 Watts) whereas pico BSs, femto BSs, and relay BSs may have lower transmit power levels (e.g., 0.1 to 2 Watts).
• UEs 120 may be dispersed throughout wireless network 100, and each UE may be stationary or mobile.
• a UE may also be referred to as an access terminal, a terminal, a mobile station, a subscriber unit, a station, etc.
• any number of wireless networks may be deployed in a given geographic area.
• Each wireless network may support a particular RAT and may operate on one or more frequencies.
• a RAT may also be referred to as a radio technology, an air interface, etc.
• a frequency may also be referred to as a carrier, a frequency channel, etc.
• Each frequency may support a single RAT in a given geographic area in order to avoid interference between wireless networks of different RATs.
• NR or 5G RAT networks may be deployed.
• a scheduling entity e.g., a base station
• the scheduling entity may be responsible for scheduling, assigning, reconfiguring, and releasing resources for one or more subordinate entities. That is, for scheduled communication, subordinate entities utilize resources allocated by the scheduling entity.
• Base stations are not the only entities that may function as a scheduling entity. That is, in some examples, a UE may function as a scheduling entity, scheduling resources for one or more subordinate entities (e.g., one or more other UEs). In this example, the UE is functioning as a scheduling entity, and other UEs utilize resources scheduled by the UE for wireless communication.
• a UE may function as a scheduling entity in a peer-to-peer (P2P) network, and/or in a mesh network. In a mesh network example, UEs may optionally communicate directly with one another in addition to communicating with the scheduling entity.
• P2P peer-to-peer
• mesh network UEs may optionally communicate directly with one another in addition to communicating with the scheduling entity.
• BS 110 may transmit, to UE 120, a random access channel (RACH) configuration within remaining minimum system information (RMSI).
• RACH random access channel
• RMSI remaining minimum system information
• the RACH configuration may be used to establish an initial active uplink bandwidth part for UE 120.
• the initial active uplink bandwidth part may be used for a RACH procedure between BS 110 and UE 120.
• BS 110 may establish an uplink physical resource block (PRB) grid for the RACH procedure based at least in part on a PRB frequency location of the initial active uplink bandwidth part.
• PRB physical resource block
• Fig. 1 is provided merely as an example. Other examples are possible and may differ from what was described with regard to Fig. 1.
• Fig. 2 shows a block diagram of a design 200 of base station 110 and UE 120, which may be one of the base stations and one of the UEs in Fig. 1.
• Base station 110 may be equipped with T antennas 234a through 234t
• UE 120 may be equipped with R antennas 252a through 252r, where in general T > 1 and R > 1.
• Transmit processor 220 may also generate reference symbols for reference signals (e.g., the cell-specific reference signal (CRS)) and synchronization signals (e.g., the primary synchronization signal (PSS) and secondary synchronization signal (SSS)).
• a transmit (TX) multiple-input multiple-output (MIMO) processor 230 may perform spatial processing (e.g., precoding) on the data symbols, the control symbols, the overhead symbols, and/or the reference symbols, if applicable, and may provide T output symbol streams to T modulators (MODs) 232a through 232t. Each modulator 232 may process a respective output symbol stream (e.g., for OFDM, etc.) to obtain an output sample stream.
• T modulators modulators
• Each modulator 232 may further process (e.g., convert to analog, amplify, filter, and upconvert) the output sample stream to obtain a downlink signal.
• T downlink signals from modulators 232a through 232t may be transmitted via T antennas 234a through 234t, respectively.
• the synchronization signals can be generated with location encoding to convey additional information.
• antennas 252a through 252r may receive the downlink signals from base station 110 and/or other base stations and may provide received signals to demodulators (DEMODs) 254a through 254r, respectively.
• Each demodulator 254 may condition (e.g., filter, amplify, downconvert, and digitize) a received signal to obtain input samples.
• Each demodulator 254 may further process the input samples (e.g., for OFDM, etc.) to obtain received symbols.
• a MIMO detector 256 may obtain received symbols from all R
• a receive processor 258 may process (e.g., demodulate and decode) the detected symbols, provide decoded data for UE 120 to a data sink 260, and provide decoded control information and system information to a controller/processor 280.
• a channel processor may determine reference signal received power (RSRP), received signal strength indicator (RSSI), reference signal received quality (RSRQ), channel quality indicator (CQI), etc.
• a transmit processor 264 may receive and process data from a data source 262 and control information (e.g., for reports comprising RSRP, RSSI, RSRQ, CQI, etc.) from controller/processor 280. Transmit processor 264 may also generate reference symbols for one or more reference signals. The symbols from transmit processor 264 may be precoded by a TX MIMO processor 266 if applicable, further processed by modulators 254a through 254r (e.g., for DFT-s-OFDM, CP-OFDM, etc.), and transmitted to base station 1 10.
• control information e.g., for reports comprising RSRP, RSSI, RSRQ, CQI, etc.
• Transmit processor 264 may also generate reference symbols for one or more reference signals.
• the symbols from transmit processor 264 may be precoded by a TX MIMO processor 266 if applicable, further processed by modulators 254a through 254r (e.g., for DFT-s-OFDM, CP-
• the uplink signals from UE 120 and other UEs may be received by antennas 234, processed by demodulators 232, detected by a MIMO detector 236 if applicable, and further processed by a receive processor 238 to obtain decoded data and control information sent by UE 120.
• Receive processor 238 may provide the decoded data to a data sink 239 and the decoded control information to controller/processor 240.
• Base station 1 10 may include communication unit 244 and communicate to network controller 130 via communication unit 244.
• Network controller 130 may include communication unit 294, controller/processor 290, and memory 292.
• one or more components of UE 120 may be included in a housing. Controller/processor 240 of base station 1 10, controller/processor 280 of UE 120, and/or any other component(s) of Fig. 2 may perform one or more techniques associated with configuring an uplink bandwidth part for a random access channel (RACH) procedure, as described in more detail elsewhere herein.
• controller/processor 240 of base station 1 10, controller/processor 280 of UE 120, and/or any other component(s) of Fig. 2 may perform or direct operations of, for example, process 1300 of Fig. 13, process 1400 of Fig. 14, process 1500 of Fig. 15, and/or other processes as described herein.
• Memories 242 and 282 may store data and program codes for base station 110 and UE 120, respectively.
• a scheduler 246 may schedule UEs for data transmission on the downlink and/or uplink.
• UE 120 may include means for identifying a physical resource block (PRB) frequency location of an initial active uplink bandwidth part based at least in part on remaining minimum system information (RMSI) received from a base station (BS), the initial active uplink bandwidth part to be used for a random access channel (RACH) procedure between the UE and the BS, means for using an uplink PRB grid, established based at least in part on the physical resource block of the initial active uplink bandwidth part, for the RACH procedure between the UE and the BS, and/or the like.
• RMSI remaining minimum system information
• RACH random access channel
• such means may include one or more components of UE 120 described in connection with Fig. 2.
• Fig. 2 is provided merely as an example. Other examples are possible and may differ from what was described with regard to Fig. 2.
• a wireless communication structure may refer to a periodic time-bounded communication unit defined by a wireless communication standard and/or protocol.
• the CRS may be transmitted in certain symbol periods of each subframe and may be used by the UEs to perform channel estimation, channel quality measurement, and/or other functions.
• the BS may also transmit a physical broadcast channel (PBCH) in symbol periods 0 to 3 in slot 1 of certain radio frames.
• PBCH physical broadcast channel
• the PBCH may carry some system information.
• the BS may transmit other system information such as system information blocks (SIBs) on a physical downlink shared channel (PDSCH) in certain subframes.
• SIBs system information blocks
• PDSCH physical downlink shared channel
• the BS may transmit control information/data on a physical downlink control channel (PDCCH) in the first B symbol periods of a subframe, where B may be configurable for each subframe.
• the BS may transmit traffic data and/or other data on the PDSCH in the remaining symbol periods of each subframe.
• a PRB uplink grid may be established based on a RACH procedure that uses an initial active uplink bandwidth part.
• the PRB uplink grid may enable communication using the frame structure 300 of Fig. 3.
• a Node B may transmit these or other signals (e.g., a synchronization signal block, a tracking reference signal, and/or the like) in these locations or in different locations of the subframe.
• signals e.g., a synchronization signal block, a tracking reference signal, and/or the like
• Fig. 4 shows two example subframe formats 410 and 420 with the normal cyclic prefix.
• the available time frequency resources may be partitioned into resource blocks.
• Each resource block may cover 12 subcarriers in one slot and may include a number of resource elements.
• Each resource element may cover one subcarrier in one symbol period and may be used to send one modulation symbol, which may be a real or complex value.
• Subframe format 410 may be used for two antennas.
• a CRS may be transmitted from antennas 0 and 1 in symbol periods 0, 4, 7, and 11.
• a reference signal is a signal that is known a priori by a transmitter and a receiver and may also be referred to as a pilot signal.
• a CRS is a reference signal that is specific for a cell, e.g., generated based at least in part on a cell identity (ID).
• ID cell identity
• Subframe format 420 may be used with four antennas.
• a CRS may be transmitted from antennas 0 and 1 in symbol periods 0, 4, 7, and 11 and from antennas 2 and 3 in symbol periods 1 and 8.
• a CRS may be transmitted on evenly spaced subcarriers, which may be determined based at least in part on cell ID.
• CRSs may be transmitted on the same or different subcarriers, depending on their cell IDs.
• resource elements not used for the CRS may be used to transmit data (e.g., traffic data, control data, and/or other data).
• the wireless network may support hybrid automatic retransmission request (HARQ) for data transmission on the downlink and uplink.
• HARQ hybrid automatic retransmission request
• a transmitter e.g., a BS
• a receiver e.g., a UE
• all transmissions of the packet may be sent in subframes of a single interlace.
• each transmission of the packet may be sent in any subframe.
• a UE may be located within the coverage of multiple BSs. One of these BSs may be selected to serve the UE. The serving BS may be selected based at least in part on various criteria such as received signal strength, received signal quality, path loss, and/or the like.
• aspects of the examples described herein may be associated with LTE technologies, aspects of the present disclosure may be applicable with other wireless communication systems, such as NR or 5G technologies.
• NR may, for example, utilize OFDM with a CP (herein referred to as CP-OFDM) and/or discrete Fourier transform spread orthogonal frequency-division multiplexing (DFT-s-OFDM) on the uplink, may utilize CP-OFDM on the downlink and include support for half-duplex operation using TDD.
• NR may include Enhanced Mobile Broadband (eMBB) service targeting wide bandwidth (e.g., 80 megahertz (MHz) and beyond), millimeter wave (mmW) targeting high carrier frequency (e.g., 60 gigahertz (GHz)), massive MTC (mMTC) targeting non-backward compatible MTC techniques, and/or mission critical targeting ultra reliable low latency communications
• eMBB Enhanced Mobile Broadband
• mmW millimeter wave
• mMTC massive MTC
• a single component carrier bandwidth of 100 MHZ may be supported.
• NR resource blocks may span 12 sub-carriers with a sub-carrier bandwidth of 75 kilohertz (kHz) over a 0.1 ms duration.
• Each radio frame may include 50 subframes with a length of 10 ms. Consequently, each subframe may have a length of 0.2 ms.
• Each subframe may indicate a link direction (e.g., DL or UL) for data transmission and the link direction for each subframe may be dynamically switched.
• Each subframe may include downlink/uplink (DL/UL) data as well as DL/UL control data.
• bandwidth resources may be divided into bandwidth parts, and a UE may use a single bandwidth part to communicate with a BS.
• Beamforming may be supported, and beam direction may be dynamically configured.
• MIMO transmissions with precoding may also be supported.
• NR may support up to 8 transmit antennas with multi-layer DL transmissions up to 8 streams and up to 2 streams per UE. Multi-layer transmissions with up to 2 streams per UE may be supported. Aggregation of multiple cells may be supported with up to 8 serving cells.
• NR may support a different air interface, other than an OFDM- based interface.
• NR networks may include entities such central units or distributed units.
• the RAN may include a central unit (CU) and distributed units (DUs).
• a NR BS e.g., gNB, 5G Node B, Node B, transmit receive point (TRP), access point (AP)
• NR cells can be configured as access cells (ACells) or data only cells (DCells).
• the RAN e.g., a central unit or distributed unit
• DCells may be cells used for carrier aggregation or dual connectivity, but not used for initial access, cell selection/reselection, or handover. In some cases, DCells may not transmit synchronization signals. In some cases, DCells may transmit synchronization signals.
• NR BSs may transmit downlink signals to UEs indicating the cell type. Based at least in part on the cell type indication, the UE may communicate with the NR BS. For example, the UE may determine NR BSs to consider for cell selection, access, handover, and/or measurement based at least in part on the indicated cell type.
• FIG. 5 illustrates an example logical architecture of a distributed RAN 500, according to aspects of the present disclosure.
• a 5G access node 506 may include an access node controller (ANC) 502.
• the ANC may be a central unit (CU) of the distributed RAN 500.
• the backhaul interface to the next generation core network (NG-CN) 504 may terminate at the ANC.
• the backhaul interface to neighboring next generation access nodes (NG-ANs) may terminate at the ANC.
• the ANC may include one or more TRPs 508 (which may also be referred to as BSs, NR BSs, Node Bs, 5G NBs, APs, gNB, or some other term).
• TRPs 508 which may also be referred to as BSs, NR BSs, Node Bs, 5G NBs, APs, gNB, or some other term.
• TRP may be used interchangeably with "cell.”
• the TRPs 508 may be a distributed unit (DU).
• the TRPs may be connected to one ANC (ANC 502) or more than one ANC (not illustrated).
• ANC 502 ANC 502
• RaaS radio as a service
• a TRP may include one or more antenna ports.
• the TRPs may be configured to individually (e.g., dynamic selection) or jointly (e.g., joint transmission) serve traffic to a UE.
• the local architecture of RAN 500 may be used to illustrate fronthaul definition.
• the architecture may be defined that support fronthauling solutions across different deployment types.
• the architecture may be based at least in part on transmit network capabilities (e.g., bandwidth, latency, and/or jitter).
• the architecture may share features and/or components with LTE.
• the next generation AN (NG-AN) 510 may support dual connectivity with NR.
• the NG-AN may share a common fronthaul for LTE and NR.
• the architecture may enable cooperation between and among TRPs 508. For example, cooperation may be preset within a TRP and/or across TRPs via the ANC 502.
• no inter-TRP interface may be needed/present.
• a dynamic configuration of split logical functions may be present within the architecture of RAN 500.
• the packet data convergence protocol (PDCP), radio link control (RLC), media access control (MAC) protocol may be adaptably placed at the ANC or TRP.
• PDCP packet data convergence protocol
• RLC radio link control
• MAC media access control
• a BS may include a central unit (CU) (e.g., ANC 502) and/or one or more distributed units (e.g., one or more TRPs 508).
• CU central unit
• distributed units e.g., one or more TRPs 508
• the architecture of RAN 500 may be used to configure an initial active uplink bandwidth part for a RACH procedure. Accordingly, one or more components of Fig. 5 may provide RMSI to a UE to facilitate configuring the initial active uplink bandwidth part for the RACH procedure.
• FIG. 6 illustrates an example physical architecture of a distributed RAN 600, according to aspects of the present disclosure.
• a centralized core network unit (C-CU) 602 may host core network functions.
• the C-CU may be centrally deployed.
• C-CU functionality may be offloaded (e.g., to advanced wireless services (AWS)), in an effort to handle peak capacity.
• AWS advanced wireless services
• a centralized RAN unit (C-RU) 604 may host one or more ANC functions.
• Fig. 7 is a diagram 700 showing an example of a DL-centric subframe or wireless communication structure.
• the DL-centric subframe of Fig. 7 may be used in RACH procedures.
• information or parameters associated with the DL-centric subframe of Fig. 7 may be provided by BS 1 10 to UE 120 within remaining minimum system information (RMSI) during a synchronization process.
• the DL-centric subframe may include a control portion 702.
• the control portion 702 may exist in the initial or beginning portion of the DL-centric subframe.
• the control portion 702 may include various scheduling information and/or control information corresponding to various portions of the DL- centric subframe.
• the DL-centric subframe may also include a DL data portion 704.
• the DL data portion 704 may sometimes be referred to as the payload of the DL-centric subframe.
• the DL data portion 704 may include the communication resources utilized to communicate DL data from the scheduling entity (e.g., UE or BS) to the subordinate entity (e.g., UE).
• the DL data portion 704 may be a physical DL shared channel (PDSCH).
• PDSCH physical DL shared channel
• the UL short burst portion 706 may include feedback information corresponding to the control portion 702 and/or the data portion 704.
• information that may be included in the UL short burst portion 706 include an ACK signal (e.g., a PUCCH ACK, a PUSCH ACK, an immediate ACK), a NACK signal (e.g., a PUCCH NACK, a PUSCH NACK, an immediate NACK), a scheduling request (SR), a buffer status report (BSR), a HARQ indicator, a channel state indication (CSI), a channel quality indicator (CQI), a sounding reference signal (SRS), a demodulation reference signal (DMRS), PUSCH data, and/or various other suitable types of information.
• the UL short burst portion 706 may include additional or alternative information, such as information pertaining to random access channel (RACH) procedures, scheduling requests, and various other suitable types of information.
• RACH random access channel
• the end of the control portion 802 may be separated in time from the beginning of the UL long burst portion 804. This time separation may sometimes be referred to as a gap, guard period, guard interval, and/or various other suitable terms. This separation provides time for the switch-over from DL communication (e.g., reception operation by the scheduling entity) to UL communication (e.g., transmission by the scheduling entity).
• DL communication e.g., reception operation by the scheduling entity
• UL communication e.g., transmission by the scheduling entity
• Fig. 9 is a diagram illustrating an example 900 of a call flow for a random access channel (RACH) procedure, in accordance with various aspects of the present disclosure.
• BS 110 and UE 120 exchange communications, including communications of a RACH procedure, based at least in part on an initial activity event occurring with UE 120.
• An initial activity may include UE 120 powering on, UE 120 entering a coverage area of BS 1 10, and/or the like.
• an initial activity event occurs with UE 120.
• UE 120 may be powered on and/or may enter a coverage area of BS 1 10.
• UE 120 sends a synchronization request to BS 1 10.
• BS 1 10 replies to the synchronization request by sending RMSI with a RACH configuration to UE 120.
• the RMSI may include communication information for UE 120 to use to communicate with BS 1 10.
• the RMSI may be SystemlnformationBlockTypel (SIB-1) and/or may be included within SIB- 1.
• SIB- 1 may be used to indicate the RMSI and/or the RACH configuration.
• the RACH configuration may include information associated with an initial active uplink bandwidth part for the RACH procedure of Fig. 9 to enable UE 120 and BS 1 10 to establish a communication link.
• the RACH configuration may indicate or provide instructions for identifying the initial active uplink bandwidth part (e.g., via a PRB frequency location of the initial active uplink bandwidth part, a bandwidth of the initial active uplink bandwidth part, and/or a numerology of the initial active uplink bandwidth part).
• an uplink PRB grid may be established for communication between UE 120 and BS 1 10.
• BS 110 sends Msg.4 (contention resolution message) via the PDSCH.
• Msg.4 contention resolution message
• UE 120 may send an acknowledgement indicating that UE 120 is ready to communicate with BS 110 via an uplink PRB grid (which is used in the communication link between UE 120 and BS 110).
• the RMSI may include a numerology of the initial active uplink bandwidth part.
• the numerology may include or indicate a subcarrier spacing for the RACH procedure, a cyclic prefix for the RACH procedure, or a number of symbols per slot for the RACH procedure.
• the numerology may be indicated to be the same as a numerology for Msg.3 and/or the acknowledgement to Msg.4 from UE 120.
• Fig. 9 is provided as an example. Other examples are possible and may differ from what was described with respect to Fig. 9.
• Fig. 10 is provided as an example. Other examples are possible and may differ from what was described with respect to Fig. 10.
• a plurality of initial active uplink bandwidth parts may be active or available for communication with a BS (e.g., BS 110) and a single reference uplink frequency location may be used to identify the initial active uplink bandwidth parts to be used for the RACH procedure.
• a BS e.g., BS 110
• a single reference uplink frequency location may be used to identify the initial active uplink bandwidth parts to be used for the RACH procedure.
• a plurality of initial active uplink bandwidth parts may be active or available for communication with a BS (e.g., BS 110) and a plurality of reference uplink frequency locations (shown as UL ARFCN Fl, UL ARFCN F2, and UL ARFCN F3) may be provided with corresponding offsets (shown as offset 1, offset 2, and offset 3)
• a UE may select from and/or use one or more of a plurality of initial active uplink bandwidth parts for a RACH procedure with a BS based at least in part on an indication (e.g., within the RMSI) of a plurality of reference uplink frequency locations and corresponding offsets.
• Fig. 13 is a diagram illustrating an example process 1300 performed, for example, by a UE, in accordance with various aspects of the present disclosure.
• Example process 1300 is an example where a UE (e.g., UE 120) configures an initial active uplink bandwidth part for a RACH procedure.
• a UE e.g., UE 120
• identifying the PRB frequency location of the initial active uplink bandwidth part may include identifying a reference uplink frequency location of an uplink transmission of the UE; identifying an offset from the reference uplink frequency location; and identifying the PRB frequency location of the initial active uplink bandwidth part to be at a frequency location at the offset from the reference uplink frequency location.
• the reference frequency location may be an absolute radio frequency channel number indicated in the RMSI or a physical random access channel (PRACH) frequency location indicated in the RMSI.
• identifying the PRB frequency location of the initial active uplink bandwidth part may include identifying a plurality of reference uplink frequency locations in a RACH configuration, of the RACH procedure, included within the RMSI; and selecting a reference uplink frequency location from the plurality of reference uplink frequency locations to identify the PRB location of the initial active uplink bandwidth part.
• selecting the reference uplink frequency location from the plurality of reference uplink frequency locations may include selecting the reference uplink frequency location based at least in part on a setting of the UE associated with the RACH procedure.
• the setting may include at least one of a mapping or hash function based at least in part on a parameter of the UE, a synchronization signal block (SSB) index of a physical random access channel (PRACH) transmission of the RACH procedure, or a slot index of the PRACH transmission of the RACH procedure.
• SSB synchronization signal block
• PRACH physical random access channel
• process 1300 may include using an uplink PRB grid, established based at least in part on the physical resource block of the initial active uplink bandwidth part, for the RACH procedure between the UE and the BS (block 1320).
• the UE e.g., using antenna 252, MOD 254, transmit processor 264, TX MIMO processor 266, controller/processor 280, and/or the like
• the uplink PRB grid may be based at least in part on a numerology of the initial active uplink bandwidth part, wherein the numerology comprises at least one of a subcarrier spacing for the RACH procedure, a cyclic prefix for the RACH procedure, or a number of symbols per slot for the RACH procedure.
• the numerology may be based at least in part on at least one of a numerology of a physical uplink shared channel (PUSCH) for a Message 3 (Msg.3) transmission of the RACH procedure, or a numerology of a physical uplink control channel (PUCCH) for an acknowledgment (ACK) of a Message 4 (Msg.4) transmission of the RACH procedure.
• PUSCH physical uplink shared channel
• Msg.3 Message 3
• PUCCH physical uplink control channel
• the uplink PRB grid may be established based at least in part on the PRB frequency location of the initial active uplink bandwidth part and at least one of a bandwidth of the initial active uplink bandwidth part, or a numerology of the initial active uplink bandwidth part.
• the uplink PRB grid for the RACH procedure is used for at least one of a physical random access channel (PRACH) of the RACH procedure, a physical uplink control channel (PUCCH) of the RACH procedure, or a physical uplink shared channel (PUSCH) of the RACH procedure.
• PRACH physical random access channel
• PUCCH physical uplink control channel
• PUSCH physical uplink shared channel
• process 1300 may include additional blocks, fewer blocks, different blocks, or differently arranged blocks than those depicted in Fig. 13. Additionally, or alternatively, two or more of the blocks of process 1300 may be performed in parallel.
• Fig. 14 is a diagram illustrating an example process 1400 performed, for example, by a BS, in accordance with various aspects of the present disclosure.
• Example process 1400 is an example where a BS (e.g., BS 1 10) configures an initial active uplink bandwidth part for a RACH procedure.
• a BS e.g., BS 1 10
• process 1400 may include transmitting, to a user equipment (UE), a random access channel (RACH) configuration within remaining minimum system information (RMSI), the RACH configuration to be used to establish an initial active uplink bandwidth part for the UE, the initial active uplink bandwidth part to be used for a RACH procedure between the BS and the UE (block 1410).
• the BS e.g., using transmit processor 220, TX MIMO processor 230, MOD 232, antenna 234, controller/processor 240, and/or the like
• the RACH configuration may include a reference uplink frequency location of an uplink transmission of the UE, and an offset from the reference uplink frequency location, wherein the PRB frequency location of the initial active uplink bandwidth part is located at a frequency location that is at the offset from the reference uplink frequency location.
• the reference uplink frequency location may include an absolute radio frequency channel number (ARFCN) indicated in the RMSI; or a physical random access channel (PRACH) frequency location indicated in the RMSI.
• ARFCN absolute radio frequency channel number
• PRACH physical random access channel
• the RACH configuration may include a plurality of offsets, wherein the plurality of offsets are associated with different initial active uplink bandwidth parts, and wherein the offset is to be selected from the plurality of offsets, such that the PRB frequency location of the initial active uplink bandwidth part is at a frequency location of the offset.
• the RACH configuration may indicate that the offset is to be selected from the plurality of offsets based at least in part on a setting of the UE.
• the RACH configuration may include a plurality of reference uplink frequency locations, wherein a reference uplink frequency location is to be selected from the plurality of reference uplink frequency locations as a center frequency for the initial active uplink bandwidth part.
• the RACH configuration may indicate that the reference uplink frequency location is to be selected from the plurality of reference uplink frequency locations based at least in part on a setting of the UE.
• the setting may include at least one of a mapping or hash function based at least in part on a parameter of the UE, a synchronization signal block (SSB) index of a physical random access channel (PRACH) transmission of the RACH procedure, or a slot index of the PRACH transmission of the RACH procedure.
• SSB synchronization signal block
• process 1400 may include establishing an uplink physical resource block (PRB) grid for the RACH procedure based at least in part on the initial active uplink bandwidth part (block 1420).
• the BS e.g., using transmit processor 220, TX MIMO processor 230, MOD 232, antenna 234, controller/processor 240, and/or the like
• the uplink PRB grid may be established based at least in part on a bandwidth of the initial active uplink bandwidth part, wherein information identifying the bandwidth of the initial active uplink bandwidth part is included in the RMSI.
• the uplink PRB grid may be established based at least in part on a bandwidth of the initial active uplink bandwidth part.
• the bandwidth of the initial active uplink bandwidth part may be based at least in part on a bandwidth of an initial active downlink bandwidth part for the UE, a minimum uplink transmission bandwidth of the RACH procedure, a bandwidth of a physical uplink shared channel (PUSCH) for a Message 3 (Msg.3) transmission of the RACH procedure, or a bandwidth of a physical uplink control channel (PUCCH) for an acknowledgement (ACK) Message 4 (Msg.4) transmission of the RACH procedure.
• the bandwidth of the PUSCH or the PUCCH is signaled within the RMSI.
• the uplink PRB grid may be established based at least in part on a numerology of the initial active uplink bandwidth part, wherein the numerology indicates at least one of a subcarrier spacing for the RACH procedure, a cyclic prefix for the RACH procedure, or a number of symbols per slot for the RACH procedure.
• the numerology may include a numerology of a physical uplink shared channel (PUSCH) for a Message 3 (Msg.3) transmission of the RACH procedure, or a numerology of a physical uplink control channel (PUCCH) for an acknowledgment (ACK) of a Message 4 (Msg.4) transmission of the RACH procedure.
• PUSCH physical uplink shared channel
• Msg.3 Message 3
• PUCCH physical uplink control channel
• the uplink PRB grid may be established based at least in part on a PRB frequency location of the initial active uplink bandwidth part and at least one of a bandwidth of the initial active uplink bandwidth part, or a numerology of the initial active uplink bandwidth part.
• the uplink PRB grid for the RACH procedure is used for at least one of: a physical random access channel (PRACH) of the RACH procedure, a physical uplink control channel (PUCCH) of the RACH procedure, or a physical uplink shared channel (PUSCH) of the RACH procedure.
• PRACH physical random access channel
• PUCCH physical uplink control channel
• PUSCH physical uplink shared channel
• process 1400 may include additional blocks, fewer blocks, different blocks, or differently arranged blocks than those depicted in Fig. 14. Additionally, or alternatively, two or more of the blocks of process 1400 may be performed in parallel.
• Fig. 15 is a diagram illustrating an example process 1500 performed, for example, by a UE, in accordance with various aspects of the present disclosure.
• Example process 1500 is an example where a UE (e.g., UE 120) configures an initial active uplink bandwidth part for a RACH procedure.
• a UE e.g., UE 120
• process 1500 may include receiving remaining minimum system information (RMSI) from a base station (BS) (block 1510).
• the UE e.g., using antenna 252, DEMOD 254, MIMO detector 256, receive processor 258, controller/processor 280, and/or the like
• the RMSI includes a numerology of the initial active uplink bandwidth part, wherein the numerology comprises at least one of: a subcarrier spacing for the RACH procedure, a cyclic prefix for the RACH procedure, or a number of symbols per slot for the RACH procedure.
• the numerology is based at least in part on at least one of: a numerology of a physical uplink shared channel (PUSCH) for a Message 3 (Msg.3) transmission of the RACH procedure, or a numerology of a physical uplink control channel (PUCCH) for an acknowledgment (ACK) of a Message 4 (Msg.4) transmission of the RACH procedure.
• PUSCH physical uplink shared channel
• Msg.3 Message 3
• PUCCH physical uplink control channel
• the RMSI includes at least one of: a bandwidth of the initial active uplink bandwidth part, a reference frequency of the initial active uplink bandwidth part, an offset from the reference frequency of the initial active uplink bandwidth part, or a numerology of the initial active uplink bandwidth part.
• process 1500 may include determining an initial active uplink bandwidth part based at least in part on the RMSI (block 1520).
• the UE e.g., using receive processor 258, controller/processor 280, and/or the like
• determining the initial active uplink bandwidth part may include identifying a reference uplink frequency location of an uplink transmission of the UE; identifying an offset from the reference uplink frequency location; and identifying a physical resource block (PRB) frequency location of the initial active uplink bandwidth part to be at a frequency location at the offset from the reference uplink frequency location.
• the reference uplink frequency location comprises at least one of: an absolute radio frequency channel number indicated in the RMSI or a physical random access channel (PRACH) frequency location indicated in the RMSI.
• identifying the PRB frequency location of the initial active uplink bandwidth part may include identifying a plurality of offsets in a RACH configuration, of the RACH procedure, included within the RMSI, wherein the plurality of offsets are associated with different initial active uplink bandwidth parts; and selecting the offset, from the plurality of offsets, for the PRB frequency location of the initial active uplink bandwidth part.
• selecting the offset from the plurality of offsets may include selecting the offset based at least in part on a setting of the UE associated with the RACH procedure.
• the initial active uplink bandwidth part is determined based at least in part on a physical resource block (PRB) frequency location of the initial active uplink bandwidth part, wherein PRB frequency location is indicated in the RMSI.
• identifying the PRB frequency location of the initial active uplink bandwidth part may include identifying a plurality of reference uplink frequency locations in a RACH configuration, of the RACH procedure, included within the RMSI and selecting a reference uplink frequency location from the plurality of reference uplink frequency locations as the PRB frequency location of the initial active uplink bandwidth part.
• selecting the reference uplink frequency location from the plurality of reference uplink frequency locations may include selecting the reference uplink frequency location based at least in part on a setting of the UE associated with the RACH procedure.
• the setting comprises at least one of: a mapping or hash function based at least in part on a parameter of the UE, a synchronization signal block (SSB) index of a physical random access channel (PRACH) transmission of the RACH procedure, or a slot index of the PRACH transmission of the RACH procedure.
• SSB synchronization signal block
• process 1500 may include using the initial active uplink bandwidth part for a random access channel (RACH) procedure between the UE and the BS (block 1530).
• the UE e.g., using antenna 252, MOD 254, TX MIMO processor 264, transmit processor 266, controller/processor 280, and/or the like
• the initial active uplink bandwidth part for the RACH procedure is used for at least one of: a physical random access channel (PRACH) of the RACH procedure, a physical uplink control channel (PUCCH) of the RACH procedure, or a physical uplink shared channel (PUSCH) of the RACH procedure.
• PRACH physical random access channel
• PUCCH physical uplink control channel
• PUSCH physical uplink shared channel
• the term component is intended to be broadly construed as hardware, firmware, or a combination of hardware and software.
• a processor is implemented in hardware, firmware, or a combination of hardware and software.
• satisfying a threshold may refer to a value being greater than the threshold, greater than or equal to the threshold, less than the threshold, less than or equal to the threshold, equal to the threshold, not equal to the threshold, and/or the like.
• "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-u, 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).

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