WO2022232727A1 - Phase tracking reference signal (ptrs) for random access - Google Patents
Phase tracking reference signal (ptrs) for random access Download PDFInfo
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- WO2022232727A1 WO2022232727A1 PCT/US2022/071157 US2022071157W WO2022232727A1 WO 2022232727 A1 WO2022232727 A1 WO 2022232727A1 US 2022071157 W US2022071157 W US 2022071157W WO 2022232727 A1 WO2022232727 A1 WO 2022232727A1
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- rach message
- downlink
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
- H04L5/00—Arrangements affording multiple use of the transmission path
- H04L5/003—Arrangements for allocating sub-channels of the transmission path
- H04L5/0048—Allocation of pilot signals, i.e. of signals known to the receiver
- H04L5/005—Allocation of pilot signals, i.e. of signals known to the receiver of common pilots, i.e. pilots destined for multiple users or terminals
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
- H04L5/00—Arrangements affording multiple use of the transmission path
- H04L5/003—Arrangements for allocating sub-channels of the transmission path
- H04L5/0053—Allocation of signaling, i.e. of overhead other than pilot signals
-
- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
- H04L5/00—Arrangements affording multiple use of the transmission path
- H04L5/0091—Signaling for the administration of the divided path
- H04L5/0094—Indication of how sub-channels of the path are allocated
Definitions
- aspects of the present disclosure relate generally to wireless communication and to techniques for a phase tracking reference signal (PTRS) for random access.
- PTRS phase tracking reference signal
- 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 (for example, 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 network may include a number of base stations (BSs) that can support communication for a number of user equipment (UEs).
- UE may communicate with a base station via the downlink (DL) and uplink (UL).
- DL (or “forward link”) refers to the communication link from the base station to the UE
- UL (or “reverse link”) refers to the communication link from the UE to the base station.
- a base station may be referred to as a NodeB, an LTE evolved nodeB (eNB), a gNB, an access point (AP), a radio head, a transmit receive point (TRP), a New Radio (NR) base station, or a 5G NodeB.
- eNB LTE evolved nodeB
- AP access point
- TRP transmit receive point
- NR New Radio
- NR which also may be referred to as 5G, is a set of enhancements to the LTE mobile standard promulgated by the 3GPP.
- 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 DL, using CP-OFDM or SC-FDM (for example, also known as discrete Fourier transform spread OFDM (DFT-s-OFDM)) on the UL (or a combination thereof), as well as supporting beamforming, multiple-input multiple-output (MIMO) antenna technology, and carrier aggregation.
- OFDM orthogonal frequency-division multiplexing
- SC-FDM for example, also known as discrete Fourier transform spread OFDM (DFT-s-OFDM)
- MIMO multiple-input multiple-output
- the method may include receiving a downlink random access channel (RACH) message including a phase tracking reference signal (PTRS); and performing a communication associated with the downlink RACH message.
- RACH downlink random access channel
- PTRS phase tracking reference signal
- the method can include receiving an indication that the downlink RACH message includes the PTRS.
- the indication can be implicit in an indication of repetition or a parameter of repetition.
- the downlink RACH message can include at least one of a second RACH message of a four-step RACH procedure, a fourth RACH message of the four-step RACH procedure, or a second RACH message of a two-step RACH procedure.
- the apparatus may include a first interface configured to obtain a downlink RACH message including a PTRS.
- the apparatus may include the first interface or a second interface configured to output a communication associated with the downlink RACH message.
- the 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 UE, may cause the one or more processors to obtain a downlink RACH message including a PTRS; and output a communication associated with the downlink RACH message.
- the apparatus may include means for obtaining a downlink RACH message including a PTRS; and means for outputting a communication associated with the downlink RACH message.
- Another innovative aspect of the subject matter described in this disclosure can be implemented in a method of wireless communication performed by an apparatus of a network entity, such as a base station (BS).
- the method may include transmitting a downlink RACH message including a PTRS; and performing a communication associated with the downlink RACH message.
- Another innovative aspect of the subject matter described in this disclosure can be implemented in an apparatus of a network entity, such as a base station, for wireless communication.
- the apparatus may include an interface configured to output a downlink RACH message including a PTRS; and to output a communication associated with the downlink RACH message.
- the method can include transmitting an indication that the downlink RACH message includes the PTRS.
- the indication can be implicit in an indication of repetition or a parameter of repetition.
- the downlink RACH message can include the PTRS if a condition is satisfied, and the condition can be associated with at least one of a frequency band of the downlink RACH message, a frequency range of the downlink RACH message, or a subcarrier spacing associated with the downlink RACH message.
- the downlink RACH message can include at least one of a second RACH message of a four-step RACH procedure, a fourth RACH message of the four-step RACH procedure, or a second RACH message of a two-step RACH procedure.
- the 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 network entity, such as a base station, may cause the one or more processors to output a downlink RACH message including a PTRS; and to output a communication associated with the downlink RACH message.
- the apparatus may include means for outputting a downlink RACH message including a PTRS; and means for outputting a communication associated with the downlink RACH message.
- aspects generally include a method, apparatus, system, computer program product, non-transitory computer-readable medium, user equipment, base station, wireless communication device, or processing system as substantially described herein with reference to and as illustrated by the accompanying drawings and appendix.
- Figure 1 is a diagram illustrating an example of a wireless network.
- Figure 2 is a diagram illustrating an example of a base station (BS) in communication with a user equipment (UE) in a wireless network.
- BS base station
- UE user equipment
- Figure 3 is a diagram illustrating an example of a four-step random access procedure.
- Figure 4 is a diagram illustrating an example of a two-step random access procedure.
- FIG. 5 is a diagram illustrating an example associated with phase tracking reference signal (PTRS) for random access.
- PTRS phase tracking reference signal
- FIG. 6 is a diagram illustrating examples of indications that a downlink random access channel (RACH) message includes a PTRS.
- RACH downlink random access channel
- Figure 7 is a diagram illustrating an example process performed, for example, by a wireless node.
- Figure 8 is a diagram illustrating an example process performed, for example, by a component of a
- Figures 9 and 10 are block diagrams of example apparatuses for wireless communication.
- the described implementations may be implemented in any device, system or network that is capable of transmitting and receiving radio frequency signals according to any of the wireless communication standards, including any of the IEEE 802.11 standards, the Bluetooth ® standard, code division multiple access (CDMA), frequency division multiple access (FDMA), time division multiple access (TDMA), Global System for Mobile communications (GSM), GSM/General Packet Radio Service (GPRS), Enhanced Data GSM Environment (EDGE), Terrestrial Trunked Radio (TETRA), Wideband-CDMA (W-CDMA), Evolution Data Optimized (EV-DO), lxEV-DO, EV-DO Rev A, EV-DO Rev B, High Speed Packet Access (HSPA), High Speed Downlink Packet Access (HSDPA), High Speed Uplink Packet Access (HSUPA), Evolved High Speed Packet Access (HSPA+), Long Term Evolution (LTE), AMPS, or other known signals that are used to communicate within a wireless, cellular or internet of things (IOT) network, such as a system,
- Phase drift refers to discontinuity or change in a signal’s phase over time.
- Phase drift may introduce noise in some forms of wireless communication.
- phase drift may lead to degraded performance for repetitious communications (in which phase drift may occur between repetitions of a communication) and in situations where a transmitter is unable to accurately maintain phase continuity.
- a phase tracking reference signal may be used in a communication system to identify phase drift and correct phase noise (such as oscillator phase noise).
- a PTRS may be used to correct phase noise for millimeter wave (mmWave) communications, to provide phase continuity across repetitions for joint channel estimation (for example, by assisting a receiver to estimate or cancel phase jumps), or to reduce or correct frequency error (such as frequency error caused by Doppler effects), among other examples.
- mmWave millimeter wave
- frequency error such as frequency error caused by Doppler effects
- a PTRS may be configured by radio resource control (RRC) signaling, which may not be available during initial access for random access channel (RACH) communications. Because configuration of the PTRS may not be available during initial access, joint channel estimation may not be enabled for downlink RACH communications. Furthermore, certain operations, such as phase error correction and frequency error correction, may not be enabled for downlink RACH communications since the configuration of the PTRS may not be available during initial access. Single-shot downlink RACH communications (which may be required if phase drift cannot be controlled) may lead to low-capability UEs and UEs in poor coverage being unable to successfully receive a downlink RACH message.
- RRC radio resource control
- the PTRS can be transmitted within a downlink RACH message, such as RACH Message B (msgB) of a two-step RACH procedure, or RACH Message 2 or RACH Message 4 of a four-step RACH procedure.
- a downlink RACH message such as RACH Message B (msgB) of a two-step RACH procedure, or RACH Message 2 or RACH Message 4 of a four-step RACH procedure.
- Some techniques described herein provide an indication of the presence of a PTRS, such as an indication received via a downlink RACH message or a physical downlink control channel (PDCCH) associated with a downlink RACH message, an implicit indication (such as based on an indication of repetition or a configuration of repetition), or preconfiguration via system information (SI).
- SI system information
- a wireless node such as a UE, a sidelink node, a relay node, a BS, a transmit-receive point (TRP), a distributed unit, or a radio unit
- phase error correction such as between multiple repetitions of a downlink RACH message
- frequency error correction such as frequency error caused by Doppler effects
- Joint channel estimation (sometimes referred to as demodulation reference signal (DMRS) bundling) may be enabled for downlink RACH messages since phase drift can be accurately estimated using the techniques described herein.
- frequency error may be detected and corrected, which may be beneficial for situations involving Doppler shift.
- joint channel estimation reliability of downlink RACH messaging may be improved and coverage of low-capability UEs may be improved.
- reliability of downlink RACH messaging in mobility scenarios may be improved.
- FIG. 1 is a diagram illustrating an example of a wireless network 100.
- the wireless network 100 may be or may include elements of a 5G New Radio (NR) network, an LTE network, or another type of network.
- the wireless network 100 may include one or more base stations 110 (shown as BS 110a, BS 110b, BS 110c, and BS 1 lOd) and other network entities.
- a base station (BS) is an entity that communicates with user equipment (UEs) and also may be referred to as an NR base station, a Node B, a gNB, a 5G node B (NB), an access point, or a transmit receive point (TRP).
- Each base station may provide communication coverage for a particular geographic area.
- the term “cell” can refer to a coverage area of a base station, a base station subsystem serving this coverage area, or a combination thereof, depending on the context in which the term is used.
- a base station may provide communication coverage for a macro cell, a pico cell, a femto cell, another type of cell, or a combination thereof.
- a macro cell may cover a relatively large geographic area (for example, 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 (for example, a home) and may allow restricted access by UEs having association with the femto cell (for example, UEs in a closed subscriber group (CSG)).
- a base station for a macro cell may be referred to as a macro base station.
- a base station for a pico cell may be referred to as a pico base station.
- a base station for a femto cell may be referred to as a femto base station or a home base station.
- a base station 110a may be a macro base station for a macro cell 102a
- a base station 110b may be a pico base station for a pico cell 102b
- a base station 110c may be a femto base station for a femto cell 102c.
- a base station may support one or multiple (for example, three) cells.
- the terms “eNB”, “base station”, “NR base station”, “gNB”, “TRP”, “AP”, “node B”, “5G NB”, and “cell” may be used interchangeably herein.
- a cell may not necessarily be stationary, and the geographic area of the cell may move according to the location of a mobile base station.
- the base stations may be interconnected to one another as well as to one or more other base stations or network nodes (not shown) in the wireless network 100 through various types of backhaul interfaces, such as a direct physical connection, a virtual network, or a combination thereof, using any suitable transport network.
- the wireless network 100 may include relay stations.
- a relay station is an entity that can receive a transmission of data from an upstream station (for example, a base station or a UE) and send a transmission of the data to a downstream station (for example, a UE or a base station).
- a relay station also may be a UE that can relay transmissions for other UEs.
- a relay base station 1 lOd may communicate with a macro base station 110a and a UE 120d in order to facilitate communication between the macro base station 110a and the UE 120d.
- a relay base station also may be referred to as a relay station, a relay base station, a relay, etc.
- the wireless network 100 may be a heterogeneous network that includes base stations of different types, such as macro base stations, pico base stations, femto base stations, or relay base stations, among other examples. These different types of base stations may have different transmit power levels, different coverage areas, and different impacts on interference in the wireless network 100. For example, macro base stations may have a high transmit power level (for example, 5 to 40 watts) whereas pico base stations, femto base stations, and relay base stations may have lower transmit power levels (for example, 0.1 to 2 watts).
- a network controller 130 may couple to a set of base stations and may provide coordination and control for these base stations. The network controller 130 may communicate with the base stations via a backhaul. The base stations also may communicate with one another, for example, directly or indirectly via a wireless or wireline backhaul.
- Multiple UEs 120 may be dispersed throughout the wireless network 100, and each UE may be stationary or mobile.
- a UE also may be referred to as an access terminal, a terminal, a mobile station, a subscriber unit, a station, etc.
- a UE may be a cellular phone (for example, a smart phone), a personal digital assistant (PDA), a wireless modem, a wireless communication device, a handheld device, a laptop computer, a cordless phone, a wireless local loop (WLL) station, a tablet, a camera, a gaming device, a netbook, a smartbook, an ultrabook, a medical device or equipment, biometric sensors/devices, wearable devices (smart watches, smart clothing, smart glasses, smart wrist bands, smart jewelry (for example, smart ring, smart bracelet)), an entertainment device (for example, a music or video device, or a satellite radio), a vehicular component or sensor, smart meters/sensors, industrial manufacturing equipment, a global positioning system device, or any other suitable device that is configured to communicate via a wireless or wired medium.
- PDA personal digital assistant
- WLL wireless local loop
- Some UEs may be considered machine-type communication (MTC) or evolved or enhanced machine-type communication (eMTC) UEs.
- MTC and eMTC UEs include, for example, robots, drones, remote devices, sensors, meters, monitors, or location tags, that may communicate with a base station, another device (for example, remote device), or some other entity.
- a wireless node may provide, for example, connectivity for or to a network (for example, a wide area network such as Internet or a cellular network) via a wired or wireless communication link.
- Some UEs may be considered Intemet-of-Things (IoT) devices or may be implemented as NB-IoT (narrowband internet of things) devices.
- IoT Intemet-of-Things
- NB-IoT narrowband internet of things
- a UE 120 may be included inside a housing that houses components of the UE 120, such as processor components, memory components, or other components.
- the processor components and the memory components may be coupled together.
- the processor components for example, one or more processors
- the memory components for example, a memory
- the processor components and the memory components may be operatively coupled, communicatively coupled, electronically coupled, or electrically coupled, among other examples.
- 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 also may be referred to as a radio technology, an air interface, etc.
- a frequency also may 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.
- two or more UEs 120 may communicate directly using one or more sidelink channels (for example, without using a base station 110 as an intermediary to communicate with one another).
- the UEs 120 may communicate using peer-to- peer (P2P) communications, device-to-device (D2D) communications, a vehicle -to-everything (V2X) protocol (which may include a vehicle-to-vehicle (V2V) protocol, a vehicle-to-infrastructure (V2I) protocol, or a similar protocol), or a mesh network.
- V2X vehicle -to-everything
- the UE 120 may perform scheduling operations, resource selection operations, as well as other operations described elsewhere herein as being performed by the base station 110.
- Devices of the wireless network 100 may communicate using the electromagnetic spectrum, which may be subdivided based on frequency or wavelength into various classes, bands, or channels.
- devices of the wireless network 100 may communicate using an operating band having a first frequency range (FR1), which may span from 410 MHz to 7.125 GHz.
- devices of the wireless network 100 may communicate using an operating band having a second frequency range (FR2), which may span from 24.25 GHz to 52.6 GHz.
- FR1 and FR2 are sometimes referred to as mid-band frequencies.
- FR1 is often referred to as a “sub-6 GHz” band.
- FR2 is often referred to as a “millimeter wave” band 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
- sub-6 GHz may broadly represent frequencies less than 6 GHz, frequencies within FR1, mid band frequencies (for example, greater than 7.125 GHz), or a combination thereof.
- millimeter wave may broadly represent frequencies within the EHF band, frequencies within FR2, mid-band frequencies (for example, less than 24.25 GHz), or a combination thereof. It is contemplated that the frequencies included in FR1 and FR2 may be modified, and techniques described herein are applicable to those modified frequency ranges.
- the UE 120 may include a communication manager 140.
- the communication manager 140 may determine that a downlink random access channel (RACH) message includes a phase tracking reference signal (PTRS) and may perform a communication associated with the downlink RACH message. Additionally, or alternatively, the communication manager 140 may perform one or more other operations described herein.
- RACH downlink random access channel
- PTRS phase tracking reference signal
- the base station 110 may include a communication manager 150.
- the communication manager 150 may transmit a PTRS in a downlink RACH message and may perform a communication associated with the downlink RACH message. Additionally, or alternatively, the communication manager 150 may perform one or more other operations described herein.
- the communication manager 150 may be implemented at a network entity, such as a central unit, a distributed unit, a radio unit, or a combination thereof.
- a network node may be implemented in multiple manners with various components or constituent parts.
- a network node may be implemented in an aggregated or disaggregated architecture.
- a BS such as a Node B (NB), evolved NB (eNB), NR BS, 5G NB, gNodeB (gNB), access point (AP), a transmit receive point (TRP), or a cell, etc.
- NB Node B
- eNB evolved NB
- gNB gNodeB
- AP access point
- TRP transmit receive point
- a cell etc.
- a BS such as a Node B (NB), evolved NB (eNB), NR BS, 5G NB, gNodeB (gNB), access point (AP), a transmit receive point (TRP), or a cell, etc.
- NB Node B
- eNB evolved NB
- gNB gNodeB
- AP access point
- TRP transmit receive point
- a cell a cell, etc.
- an aggregated base station also known as a standalone BS or a monolithic BS
- disaggregated base station also known as a
- wireless node can refer to an aggregated base station, a disaggregated base station, or one or more units or components of an aggregated base station or a disaggregated base station.
- An aggregated base station may be configured to utilize a radio protocol stack that is physically or logically integrated within a single RAN node.
- a disaggregated base station may be configured to utilize a protocol stack that is physically or logically distributed among two or more units (such as one or more central or centralized units (CUs), one or more distributed units (DUs), or one or more radio units (RUs)).
- CUs central or centralized units
- DUs distributed units
- RUs radio units
- a CU may be implemented within a RAN node, and one or more DUs may be co-located with the CU, or alternatively, may be geographically or virtually distributed throughout one or multiple other RAN nodes.
- the DUs may be implemented to communicate with one or more RUs.
- Each of the CU, DU and RU also can be implemented as virtual units, i.e., a virtual central unit (VCU), a virtual distributed unit (VDU), or a virtual radio unit (VRU).
- Base station-type operation or network design may consider aggregation characteristics of base station functionality.
- disaggregated base stations may be utilized in an integrated access backhaul (IAB) network, an open radio access network (O-RAN (such as the network configuration sponsored by the O-RAN Alliance)), or a virtualized radio access network (vRAN, also known as a cloud radio access network (C-RAN)).
- IAB integrated access backhaul
- O-RAN open radio access network
- vRAN also known as a cloud radio access network
- Disaggregation may include distributing functionality across two or more units at various physical locations, as well as distributing functionality for at least one unit virtually, which can enable flexibility in network design.
- the various units of the disaggregated base station, or disaggregated RAN architecture can be configured for wired or wireless communication with at least one other unit.
- “Base station” and “wireless node”, as used herein, can refer to an aggregated base station, or to a disaggregated base station, or to one or more components or units
- FIG. 2 is a diagram illustrating an example 200 of a base station 110 in communication with a UE 120 in a wireless network 100.
- the base station 110 may be equipped with T antennas 234a through 234t
- the UE 120 may be equipped with R antennas 252a through 252r, where in general T > 1 and R > 1.
- a transmit processor 220 may receive data from a data source 212 for one or more UEs, select one or more modulation and coding schemes (MCS) for each UE based on channel quality indicators (CQIs) received from the UE, process (for example, encode and modulate) the data for each UE based on the MCS(s) selected for the UE, and provide data symbols for all UEs.
- MCS modulation and coding schemes
- CQIs channel quality indicators
- the transmit processor 220 also may process system information (for example, for semi-static resource partitioning information) and control information (for example, CQI requests, grants, or upper layer signaling) and provide overhead symbols and control symbols.
- the transmit processor 220 also may generate reference symbols for reference signals (for example, a cell-specific reference signal (CRS) or a demodulation reference signal (DMRS)) and synchronization signals (for example, a primary synchronization signal (PSS) or a secondary synchronization signal (SSS)).
- a transmit (TX) multiple -input multiple-output (MIMO) processor 230 may perform spatial processing (for example, precoding) on the data symbols, the control symbols, the overhead symbols, 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 (for example, for OFDM) to obtain an output sample stream.
- Each modulator 232 may further process (for example, convert to analog, amplify, fdter, and upconvert) the output sample stream to obtain a downlink signal.
- T downlink signals from the modulators 232a through 232t may be transmitted via T antennas 234a through 234t, respectively.
- the antennas 252a through 252r may receive the downlink signals from the base station 110 or other base stations and may provide received signals to the demodulators (DEMODs) 254a through 254r, respectively.
- Each demodulator 254 may condition (for example, fdter, amplify, downconvert, and digitize) a received signal to obtain input samples.
- Each demodulator 254 may further process the input samples (for example, for OFDM) to obtain received symbols.
- a MIMO detector 256 may obtain received symbols from all R demodulators 254a through 254r, perform MIMO detection on the received symbols if applicable, and provide detected symbols.
- a receive processor 258 may process (for example, demodulate and decode) the detected symbols, provide decoded data for the UE 120 to a data sink 260, and provide decoded control information and system information to a controller/processor 280.
- controller/processor may refer to one or more controllers, one or more processors, or a combination thereof.
- a channel processor may determine a reference signal received power (RSRP) parameter, a received signal strength indicator (RSSI) parameter, a reference signal received quality (RSRQ) parameter, or a CQI parameter, among other examples.
- RSRP reference signal received power
- RSSI received signal strength indicator
- RSSQ reference signal received quality
- CQI parameter CQI parameter
- the network controller 130 may include a communication unit 294, a controller/processor 290, and a memory 292.
- the network controller 130 may include, for example, one or more devices in a core network.
- the network controller 130 may communicate with the base station 110 via the communication unit 294.
- Antennas (such as antennas 234a through 234t or antennas 252a through 252r) may include, or may be included within, one or more antenna panels, antenna groups, sets of antenna elements, or antenna arrays, among other examples.
- An antenna panel, an antenna group, a set of antenna elements, or an antenna array may include one or more antenna elements.
- An antenna panel, an antenna group, a set of antenna elements, or an antenna array may include a set of coplanar antenna elements or a set of non-coplanar antenna elements.
- An antenna panel, an antenna group, a set of antenna elements, or an antenna array may include antenna elements within a single housing or antenna elements within multiple housings.
- An antenna panel, an antenna group, a set of antenna elements, or an antenna array may include one or more antenna elements coupled to one or more transmission or reception components, such as one or more components of Figure 2.
- a transmit processor 264 may receive and process data from a data source 262 and control information (for example, for reports including RSRP, RSSI, RSRQ, or CQI) from a controller/processor 280.
- the transmit processor 264 also may generate reference symbols for one or more reference signals.
- the symbols from the transmit processor 264 may be precoded by a TX MIMO processor 266 if applicable, further processed by the modulators 254a through 254r (for example, for DFT-s-OFDM or CP-OFDM) and transmitted to the base station 110.
- a modulator and a demodulator (for example, MOD/DEMOD 254) of the UE 120 may be included in a modem of the UE 120.
- the UE 120 includes a transceiver.
- the transceiver may include any combination of the antenna(s) 252, the modulators 254, the demodulators 254, the MIMO detector 256, the receive processor 258, the transmit processor 264, or the TX MIMO processor 266.
- the transceiver may be used by a processor (for example, the controller/processor 280) and the memory 282 to perform aspects of any of the processes described herein.
- the uplink signals from the UE 120 and other UEs may be received by the antennas 234, processed by the 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 the UE 120.
- the receive processor 238 may provide the decoded data to a data sink 239 and the decoded control information to a controller/processor 240.
- the base station 110 may include a communication unit 244 and may communicate with the network controller 130 via the communication unit 244.
- the base station 110 may include a scheduler 246 to schedule one or more UEs 120 for downlink communications, uplink communications, or a combination thereof.
- a modulator and a demodulator (for example, MOD/DEMOD 232) of the base station 110 may be included in a modem of the base station 110.
- the base station 110 includes a transceiver.
- the transceiver may include any combination of the antenna(s) 234, the modulators 232, the demodulators 232, the MIMO detector 236, the receive processor 238, the transmit processor 220, or the TX MIMO processor 230.
- the transceiver may be used by a processor (for example, the controller/processor 240) and a memory 242 to perform aspects of any of the processes described herein.
- the controller/processor 280 may be a component of a processing system.
- a processing system may generally refer to a system or series of machines or components that receives inputs and processes the inputs to produce a set of outputs (which may be passed to other systems or components of, for example, the UE 120).
- processing system of the UE 120 may refer to a system including the various other components or subcomponents of the UE 120.
- the processing system of the UE 120 may interface with other components of the UE 120, and may process information received from other components (such as inputs or signals), output information to other components, etc.
- a chip or modem of the UE 120 may include a processing system, a first interface to receive or obtain information, and a second interface to output, transmit or provide information.
- first interface may refer to an interface between the processing system of the chip or modem and a receiver, such that the UE 120 may receive information or signal inputs, and the information may be passed to the processing system.
- second interface may refer to an interface between the processing system of the chip or modem and a transmitter, such that the UE 120 may transmit information output from the chip or modem.
- the controller/processor 240 may be a component of a processing system.
- a processing system may generally refer to a system or series of machines or components that receives inputs and processes the inputs to produce a set of outputs (which may be passed to other systems or components of, for example, the base station 110).
- processing system of the base station 110 may refer to a system including the various other components or subcomponents of the base station 110.
- the processing system of the base station 110 may interface with other components of the base station 110, and may process information received from other components (such as inputs or signals), output information to other components, etc.
- a chip or modem of the base station 110 may include a processing system, a first interface to receive or obtain information, and a second interface to output, transmit or provide information.
- first interface may refer to an interface between the processing system of the chip or modem and a receiver, such that the base station 110 may receive information or signal inputs, and the information may be passed to the processing system.
- second interface may refer to an interface between the processing system of the chip or modem and a transmitter, such that the base station 110 may transmit information output from the chip or modem.
- the second interface also may obtain or receive information or signal inputs, and the first interface also may output, transmit or provide information.
- the controller/processor 240 of the base station 110, the controller/processor 280 of the UE 120, or any other component(s) of Figure 2 may perform one or more techniques associated with a phase tracking reference signal (PTRS) for random access, as described in more detail elsewhere herein.
- PTRS phase tracking reference signal
- the controller/processor 240 of the base station 110, the controller/processor 280 of the UE 120, or any other component(s) (or combinations of components) of Figure 2 may perform or direct operations of, for example, process 700 of Figure 7, process 800 of Figure 8, or other processes as described herein.
- the memory 242 and the memory 282 may store data and program codes for the base station 110 and the UE 120, respectively.
- the memory 242 and the memory 282 may include a non-transitory computer- readable medium storing one or more instructions (for example, code or program code) for wireless communication.
- the one or more instructions when executed (for example, directly, or after compiling, converting, or interpreting) by one or more processors of the base station 110 or the UE 120, may cause the one or more processors, the UE 120, or the base station 110 to perform or direct operations of, for example, process 700 of Figure 7, process 800 of Figure 8, or other processes as described herein.
- UE 120 may include means for receiving a downlink random access channel (RACE! message including a PTRS, means for performing a communication associated with the downlink RACH message, or the like.
- RACE downlink random access channel
- such means may include one or more components of UE 120 described in connection with Figure 2, such as controller/processor 280, transmit processor 264, TX MIMO processor 266, MOD 254, antenna 252, DEMOD 254, MIMO detector 256, receive processor 258, or the like.
- base station 110 may include means for transmitting a downlink RACH message including a PTRS, means for performing a communication associated with the downlink RACH message or the like.
- such means may include one or more components of base station 110 described in connection with Figure 2, such as antenna 234, DEMOD 232, MIMO detector 236, receive processor 238, controller/processor 240, transmit processor 220, TX MIMO processor 230, MOD 232, antenna 234, or the like.
- FIG. 3 is a diagram illustrating an example of a four-step random access procedure.
- a wireless node 305 (which may include UE 120, BS 110, a relay node, a TRP, a sidelink device, a radio unit, a distributed unit, or another device) and a wireless node 310 (which may include UE 120, BS 110, a relay node, a TRP, a sidelink device, a radio unit, a distributed unit, a central unit, or another device) may communicate with one another to perform the four-step random access procedure.
- the wireless node 305 may be a UE such as the UE 120 and the wireless node 310 may be a base station such as the BS 110.
- the wireless node 310 may transmit, and the wireless node 305 may receive, one or more one or more synchronization signal blocks (SSBs) and random access configuration information.
- the random access configuration information may be transmitted in or indicated by system information (such as in one or more system information blocks (SIBs)) or an SSB, such as for contention-based random access.
- SIB is a broadcast transmission of system information used to connect to or communicate with a cell, such as to perform cell selection or reselection, access a network via the cell, or detect paging messages.
- the random access configuration information may be transmitted in a radio resource control (RRC) message or a physical downlink control channel (PDCCH) order message that triggers a random access procedure, such as for contention-free random access.
- RRC radio resource control
- PDCCH physical downlink control channel
- the random access configuration information may include one or more parameters to be used in the random access procedure, such as one or more parameters for transmitting a random access message (RAM) or one or more parameters for receiving a random access reply (RAR).
- the wireless node 305 may transmit a RAM, which may include a preamble (sometimes referred to as a random access preamble, a PRACH preamble, or a RAM preamble).
- the message that includes the preamble may be referred to as a RACH message 1, msgl, MSG1, a first message, or an initial message in a four-step random access procedure.
- the random access message may include a random access preamble identifier.
- the wireless node 310 may transmit an RAR as a reply to the preamble.
- the message that includes the RAR may be referred to as RACH message 2, msg2, MSG2, a downlink RACH message, or a second message in a four-step random access procedure.
- the RAR may indicate the detected random access preamble identifier (such as received from the wireless node 305 in msgl). Additionally, or alternatively, the RAR may indicate a resource allocation to be used by the wireless node 305 to transmit message 3 (msg3).
- the RAR may include a PTRS, as described herein.
- the wireless node 310 may transmit a PDCCH communication for the RAR.
- the PDCCH communication may schedule a PDSCH communication that includes the RAR.
- the PDCCH communication may indicate a resource allocation for the PDSCH communication.
- the wireless node 310 may transmit the PDSCH communication for the RAR, as scheduled by the PDCCH communication.
- the RAR may be included in a MAC PDU of the PDSCH communication.
- the wireless node 305 may transmit an RRC connection request message.
- the RRC connection request message may be referred to as RACH message 3, msg3, MSG3, or a third message of a four-step random access procedure.
- the RRC connection request may include a UE identifier, UCI, or a PUSCH communication (such as an RRC connection request).
- the wireless node 310 may transmit an RRC connection setup message.
- the RRC connection setup message may be referred to as RACH message 4, msg4, MSG4, a downlink RACH message, or a fourth message of a four-step random access procedure.
- the RRC connection setup message may include the detected UE identifier, a timing advance value, or contention resolution information.
- the wireless node 305 may transmit a HARQ ACK.
- the RRC connection setup message may include a PTRS, as described herein.
- FIG. 4 is a diagram illustrating an example of a two-step random access procedure.
- a wireless node 405 (which may include UE 120, BS 110, a relay node, a TRP, a sidelink device, a radio unit, a distributed unit, or another device) and a wireless node 410 (which may include UE 120, BS 110, a relay node, a TRP, a sidelink device, a radio unit, a distributed unit, or another device) may communicate with one another to perform the two-step random access procedure.
- the wireless node 405 may be a UE such as the UE 120 and the wireless node 410 may be a base station such as the BS 110.
- the wireless node 410 may transmit, and the wireless node 405 may receive, one or more SSBs and random access configuration information.
- the random access configuration information may be transmitted in or indicated by system information (such as in one or more system information blocks (SIBs)) or an SSB, such as for contention-based random access. Additionally, or alternatively, the random access configuration information may be transmitted in an RRC message or a PDCCH order message that triggers a RACH procedure, such as for contention-free random access.
- the random access configuration information may include one or more parameters to be used in the two-step random access procedure, such as one or more parameters for transmitting a RAM or receiving a RAR to the RAM.
- the wireless node 405 may transmit, and the wireless node 410 may receive, a RAM preamble. As shown by reference number 425, the wireless node 405 may transmit, and the wireless node 410 may receive, a RAM payload. As shown, the wireless node 405 may transmit the RAM preamble and the RAM payload to the wireless node 410 as part of an initial (or first) step of the two-step random access procedure.
- the RAM may be referred to as RACH message A, msgA, a first message, or an initial message in a two-step random access procedure.
- the RAM preamble may be referred to as a RACH message A preamble, a msgA preamble, a preamble, or a PRACH preamble
- the RAM payload may be referred to as a RACH message A payload, a msgA payload, or a payload.
- the RAM may include some or all of the contents of message 1 (msgl) and message 3 (msg3) of a four-step random access procedure.
- the RAM preamble may include some or all contents of message 1 (such as a PRACH preamble), and the RAM payload may include some or all contents of message 3 (such as a UE identifier, uplink control information (UCI), or a physical uplink shared channel (PUSCH) transmission).
- message 1 such as a PRACH preamble
- the RAM payload may include some or all contents of message 3 (such as a UE identifier, uplink control information (UCI), or a physical uplink shared channel (PUSCH) transmission).
- message 3 such as a UE identifier, uplink control information (UCI), or a physical uplink shared channel (PUSCH) transmission).
- UCI uplink control information
- PUSCH physical uplink shared channel
- the wireless node 410 may receive the RAM preamble transmitted by the wireless node 405. If the wireless node 410 successfully receives and decodes the RAM preamble, the wireless node 410 may then receive and decode the RAM payload.
- the wireless node 410 may transmit an RAR (sometimes referred to as an RAR message).
- the RAR may be referred to as a downlink RACH message.
- the wireless node 410 may transmit the RAR message as part of a second step of the two-step random access procedure.
- the RAR message may be referred to as RACH message B, msgB, or a second message in a two-step random access procedure.
- the RAR message may include some or all of the contents of message 2 (msg2) and message 4 (msg4) of a four-step random access procedure.
- the RAR message may include the detected PRACH preamble identifier, the detected UE identifier, a timing advance value, or contention resolution information.
- the RAR message may include a PTRS, as described herein.
- the wireless node 410 may transmit a physical downlink control channel (PDCCH) communication for the RAR.
- the PDCCH communication may schedule a physical downlink shared channel (PDSCH) communication that includes the RAR.
- PDSCH physical downlink shared channel
- the PDCCH communication may indicate a resource allocation (such as in downlink control information (DCI)) for the PDSCH communication.
- DCI downlink control information
- the wireless node 410 may transmit the PDSCH communication for the RAR, as scheduled by the PDCCH communication.
- the RAR may be included in a medium access control (MAC) protocol data unit (PDU) of the PDSCH communication.
- the PDSCH communication may include a PTRS.
- the wireless node 405 may transmit a hybrid automatic repeat request (HARQ) acknowledgement (ACK).
- HARQ hybrid automatic repeat request
- FIG. 5 is a diagram illustrating an example 500 associated with a PTRS for random access.
- a wireless node 505 (which may include UE 120, BS 110, a relay node, a TRP, a sidelink device, a distributed unit, a radio unit, or another device) and a wireless node 510 (which may include UE 120, BS 110, a relay node, a TRP, a sidelink device, a distributed unit, a radio unit, a central unit, or another device) may communicate with one another to perform a random access procedure.
- the wireless node 505 and the wireless node 510 may perform a four-step random access procedure, as described above with respect to Figure 3, or a two-step random access procedure, as described above with respect to Figure 4.
- the wireless node 505 may be a UE such as the UE 120 and the wireless node 510 may be a base station such as the BS 110.
- the wireless node 505 receives an indication from the wireless node 510.
- the indication may indicate that a downlink RACH message includes a PTRS.
- the indication may include data that enables the wireless node 505 to determine that a downlink RACH message includes a PTRS.
- the indication is an implicit indication.
- the indication may be implicit in an indication of repetition or a pattern of repetition.
- An indication of repetition includes information indicating that a communication (such as a downlink RACH message) is associated with multiple repetitions.
- a pattern of repetition indicates a configuration for the multiple repetitions, such as a periodicity associated with the multiple repetitions, one or more resource allocations for the multiple repetitions, transmission parameters for the multiple repetitions, or other information.
- the wireless node 505 may determine that a downlink RACH message is to include a PTRS if two consecutive repetitions of the downlink RACH message are separated from each other in time. The two consecutive repetitions of the downlink RACH messages may be separated in time based on an uplink transmission slot being positioned, in time, between the two downlink RACH messages.
- the presence of the uplink transmission between resources for the two downlink RACH messages may implicitly indicate, to the wireless node 505, that the two downlink RACH messages include a PTRS.
- the wireless node 505 and the wireless node 510 perform a four-step random access procedure.
- the wireless node 505 may receive the indication in a second RACH message of the four-step RACH procedure (such as RACH message 2).
- the wireless node 505 may determine, based on the indication, that the PTRS is included in a fourth RACH message of the four-step RACH procedure.
- the wireless node 505 may ascertain, obtain or determine, in accordance with the indication, that the PTRS is included in the fourth RACH message.
- Providing the indication via the second RACH message may reduce system information overhead and may provide increased flexibility for selective usage of the PTRS.
- the wireless node 505 receives the indication via a system information block (SIB).
- SIB system information block
- the wireless node 510 may transmit an SIB (such as SIB 1) to enable the presence of a PTRS in one or multiple downlink RACH messages.
- Providing the indication via the SIB may reduce overhead associated with initial access messaging, such as RACH message 2 or a control channel associated with a downlink RACH message.
- the indication is received via a control channel associated with the downlink RACH message.
- the wireless node 505 may receive, via a RACH message 2 PDCCH, an indication that a PTRS is included in a RACH message 2 of the four-step random access procedure.
- the wireless node 505 may receive, via a RACH message 2 PDCCH, an indication that a PTRS is included in a RACH message 4 of the four-step random access procedure.
- the wireless node 505 may receive, via a RACH message 4 PDCCH, an indication that enables the wireless node 505 to determine that a PTRS is included in a RACH message 4 of the four-step random access procedure.
- the wireless node 505 may receive, via a RACH message B PDCCH, an indication that a PTRS is included in a RACH message B of the two-step random access procedure.
- the wireless node 505 may receive one or more downlink RACH messages that include the PTRS.
- the wireless node 505 may receive a single repetition of the downlink RACH message.
- the wireless node 505 may receive multiple repetitions of the downlink RACH message.
- the downlink RACH message that includes the PTRS may include a second RACH message of a four-step RACH procedure, a fourth RACH message of a four-step RACH procedure, or a second RACH message of a two-step RACH procedure.
- the wireless node 505 may determine that the downlink RACH message includes the PTRS based on the indication.
- the downlink RACH message includes the PTRS if a condition is satisfied.
- the condition may be associated with a frequency band of the downlink RACH message, a frequency range of the downlink RACH message, or a subcarrier spacing associated with the downlink RACH message.
- the condition may be associated with the frequency band of the downlink RACH message (that is, a set of frequency bands may be configured to have downlink RACH messages that include a PTRS) such that a downlink RACH message, received by the wireless node 505 via one of the set of frequency bands, may include the PTRS.
- the condition can be implemented in association with the indications described above at reference number 515, or without the wireless node 505 receiving an indication.
- the wireless node 505 may determine whether the condition is satisfied, and thus whether a downlink RACH message is expected to include a PTRS, without having received an indication regarding the PTRS.
- the condition may be associated with the frequency range of the downlink RACH message (that is, downlink RACH messages in a given frequency range such as FR1 or FR2 may be configured to include a PTRS) and the condition may be satisfied when the downlink RACH message is transmitted within the frequency range.
- the condition may be associated with a subcarrier spacing associated with the downlink RACH message (that is, downlink RACH messages with a given subcarrier spacing may be configured to include a PTRS), and the condition may be satisfied when the downlink RACH message is transmitted using the given subcarrier spacing.
- the PTRS may be included in the downlink RACH message based on one or more parameters associated with the PTRS.
- the PTRS may be embedded in a physical downlink shared channel (PDSCH) resource allocation in association with up to two ports.
- the presence and density of the PTRS may be based on one or more of a modulation and coding scheme (MCS) or a resource block (RB) allocation size of the PDSCH resource allocation.
- MCS modulation and coding scheme
- RB resource block
- the wireless node 505 may be configured with an MCS threshold and an RB allocation size threshold, and may determine the presence and density of the PTRS using the MCS threshold and the RB allocation size threshold.
- the presence and density of the PTRS is indicated by the indication of the presence of the PTRS for the downlink RACH message.
- the PTRS may use a default density and resource allocation if the PTRS is activated for the downlink RACH message.
- the PTRS may be a repetition of a demodulation reference signal (DMRS).
- the PTRS may be a repetition of a DMRS signal within the PDSCH (such as for a cyclic prefix orthogonal frequency division multiplexing waveform).
- a symbol such as an orthogonal frequency division multiplexing (OFDM) symbol
- the DMRS may be used as a PTRS.
- the wireless node 505 may perform phase error estimation using the DMRS.
- a parameter of the one or more parameters associated with the PTRS may be predefined.
- the one or more parameters associated with the PTRS may be predefined by system information (such as system information transmitted by the base station via SIB 1) or predefined in a specification of a wireless communication standard.
- the wireless node 505 may perform phase error correction based on the PTRS.
- the wireless node 505 may perform phase error correction if the downlink RACH message includes multiple repetitions.
- the wireless node 505 may receive multiple repetitions of the downlink RACH message that includes the PTRS.
- the wireless node 505 may perform phase error correction for the multiple repetitions of the downlink RACH message using the PTRS.
- the wireless node 505 may identify a phase error (such as a difference in phase relative to a baseline phase known to the wireless node 505 and the wireless node 510 or a phase of a previous repetition) by reference to the PTRS.
- the wireless node 505 may process the multiple repetitions of the downlink RACH message based on the phase error.
- the wireless node 505 may apply phase offsets to one or more repetitions such that the multiple repetitions can be successfully combined by demodulation reference signal bundling, and may combine the multiple repetitions via demodulation reference signal bundling.
- the wireless node 505 may perform phase error correction based on there being multiple repetitions of the downlink RACH message. For example, the wireless node 505 may not perform phase error correction for a one-shot downlink RACH message transmission.
- the wireless node 505 may perform frequency error correction.
- the wireless node 505 may perform frequency error correction in addition to, or as an alternative to, phase error correction.
- the wireless node 505 may perform frequency error correction for the downlink RACH message that includes the PTRS using the PTRS.
- the wireless node 505 may identify a frequency error (such as a difference in frequency relative to a baseline frequency known to the wireless node 505 and the wireless node 510 or a frequency of a previous repetition) by reference to the PTRS.
- the wireless node 505 may process the downlink RACH message based on the frequency error. For example, the wireless node 505 may apply a frequency offset to the downlink RACH message such that the downlink RACH message can be successfully decoded.
- the wireless node 505 may perform communication associated with the downlink RACH message. For example, the wireless node 505 may perform initial access. As another example, the wireless node 505 may establish an RRC connection with the wireless node 510. As yet another example, the wireless node 505 may select or identify a beam pair for connection with wireless node 510 based on the downlink RACH message.
- FIG. 6 is a diagram illustrating examples of indications that a downlink RACH includes a PTRS.
- a first wireless node such as BS 110, a central unit, a distributed unit, or a radio unit
- the first wireless node may transmit an SIB having a 1-bit flag set to enable a PTRS to be included in one or multiple downlink RACH messages.
- the first wireless node may transmit, to a second wireless node (such as UE 120), an indication that a downlink RACH message will include a PTRS.
- a second wireless node such as UE 120
- the SIB may indicate that the downlink RACH message will include a PTRS (not shown in Figure 6).
- a downlink RACH message transmitted as part of a random access procedure may include an indication that the downlink RACH message that includes the indication, or a subsequent downlink RACH message transmitted as part of the random access procedure, includes a PTRS.
- the first wireless node and the second wireless node may perform a four-step random access procedure, as described above with respect to Figure 3.
- a second downlink RACH message (RACH Message 2, as shown in Figure 6) of the four-step random access procedure includes an indication that enables the second wireless node to determine that a fourth downlink RACH message (RACH Message 4, as shown in Figure 6) of the four-step random access procedure includes a PTRS.
- the second wireless node receives the indication via a control channel associated with the downlink RACH message that includes the PTRS. For example, in example 605, the second wireless node may receive an indication via a RACH message 2 PDCCH.
- the second wireless node may determine, based on the indication, that a RACH message 2 transmitted as part of a four-step random access procedure includes a PTRS.
- the second wireless node may receive an indication via a RACH message 4 PDCCH.
- the second wireless node may determine, based on the indication, that a RACH message 4 transmitted as part of a four-step random access procedure includes a PTRS.
- the second wireless node may receive an indication via a RACH message B PDCCH.
- the second wireless node may determine, based on the indication, that a RACH message B transmitted as part of a two-step random access procedure includes a PTRS.
- the second wireless node receives the indication via a control channel associated with a downlink RACH message that is different from the downlink RACH message that includes the PTRS.
- the second wireless node may receive an indication via a RACH message 2 PDCCH.
- the second wireless node may determine, based on the indication, that a RACH message 4 transmitted as part of a four-step random access procedure includes a PTRS.
- the second wireless node receives the indication via a downlink RACH message that includes the PTRS.
- the indication and the PTRS may be included in a RACH message 2 or a RACH message 4 transmitted as part of a four-step random access procedure or a RACH message B transmitted as part of a two-step random access procedure.
- both the indication and the PTRS may be included in a PDSCH of the downlink RACH message.
- FIG 7 is a diagram illustrating an example process 700 performed, for example, by a wireless node.
- the process 700 is an example where the wireless node (for example, UE 120, or a component of the wireless node, such as one or more components described with regard to Figure 1 or Figure 9) performs operations associated with a PTRS for random access.
- the wireless node for example, UE 120, or a component of the wireless node, such as one or more components described with regard to Figure 1 or Figure 9
- the process 700 may include receiving a downlink RACH message including a PTRS (block 710).
- the wireless node (such as by using communication manager 140 or reception component 902, depicted in Figure 9) may receive a downlink RACH message including a PTRS, as described above.
- the process 700 may include performing a communication associated with the downlink RACH message (block 720).
- the wireless node such as by using communication manager 140 or communication component 908, depicted in Figure 9) may perform a communication associated with the downlink RACH message, as described above.
- the process 700 may include additional aspects, such as any single aspect or any combination of aspects described below or in connection with one or more other processes described elsewhere herein.
- the process 700 includes receiving an indication that the downlink RACH message includes the PTRS.
- the indication is received via an SIB.
- the indication is received via a control channel associated with the downlink RACH message.
- the downlink RACH message is a fourth RACH message of a four-step RACH procedure, and the indication is received in a second RACH message of the four-step RACH procedure.
- the indication is implicit in an indication of repetition or a parameter of repetition.
- the indication is associated with two consecutive repetitions of the downlink RACH message being separated from each other in time.
- the process 700 includes receiving one or more parameters associated with the PTRS via system information.
- the communication is based on one or more parameters for the PTRS, and the one or more parameters are predefined.
- the process 700 includes receiving multiple repetitions of the downlink RACH message including the PTRS, and performing phase error correction for the multiple repetitions using the PTRS.
- the process 700 includes performing frequency error correction for the downlink RACH message using the PTRS.
- the downlink RACH message includes the PTRS if a condition is satisfied, where the condition is associated with at least one of a frequency band of the downlink RACH message, a frequency range of the downlink RACH message, or a subcarrier spacing associated with the downlink RACH message.
- the downlink RACH message includes at least one of a second RACH message of a four-step RACH procedure, a fourth RACH message of the four-step RACH procedure, or a second RACH message of a two- step RACH procedure.
- Figure 7 shows example blocks of the process 700
- the process 700 may include additional blocks, fewer blocks, different blocks, or differently arranged blocks than those depicted in Figure 7. Additionally, or alternatively, two or more of the blocks of the process 700 may be performed in parallel.
- FIG 8 is a diagram illustrating an example process 800 performed, for example, by a component of a wireless node such as a BS.
- the process 800 is an example where the component of the wireless node (for example, a component of the BS 110 described with regard to Figure 2 or Figure 10, a central unit, a distributed unit, a radio unit, or a combination thereof) performs operations associated with a PTRS for random access.
- the component of the wireless node for example, a component of the BS 110 described with regard to Figure 2 or Figure 10, a central unit, a distributed unit, a radio unit, or a combination thereof.
- the process 800 may include transmitting a downlink RACH message including a PTRS (block 810).
- the component (such as by using communication manager 150 or transmission component 1004, depicted in Figure 10) may transmit a downlink RACH message including a PTRS, as described above.
- the process 800 may include performing a communication associated with the downlink RACH message (block 820).
- the component (such as by using communication manager 150 or communication component 1008, depicted in Figure 10) may perform a communication associated with the downlink RACH message, as described above.
- the process 800 may include additional aspects, such as any single aspect or any combination of aspects described below or in connection with one or more other processes described elsewhere herein.
- the process 800 includes transmitting an indication that the downlink RACH message includes the PTRS.
- the indication is transmitted via a system information block.
- the indication is transmitted via a control channel associated with the downlink RACH message.
- the downlink RACH message is a fourth RACH message of a four-step RACH procedure, and the indication is transmitted in a second RACH message of the four-step RACH procedure.
- the indication is implicit in an indication of repetition or a parameter of repetition.
- the indication is associated with two consecutive repetitions of the downlink RACH message being separated from each other in time.
- the process 800 includes transmitting one or more parameters associated with the PTRS via system information.
- the communication is based on one or more parameters for the PTRS, and the one or more parameters are predefined.
- the process 800 includes transmitting multiple repetitions of the downlink RACH message including the PTRS.
- the downlink RACH message includes the PTRS if a condition is satisfied, where the condition is associated with at least one of a frequency band of the downlink RACH message, a frequency range of the downlink RACH message, or a subcarrier spacing associated with the downlink RACH message.
- the downlink RACH message includes at least one of a second RACH message of a four-step RACH procedure, a fourth RACH message of the four-step RACH procedure, or a second RACH message of a two- step RACH procedure.
- Figure 8 shows example blocks of the process 800
- the process 800 may include additional blocks, fewer blocks, different blocks, or differently arranged blocks than those depicted in Figure 8. Additionally, or alternatively, two or more of the blocks of the process 800 may be performed in parallel.
- FIG. 9 is a block diagram of an example apparatus 900 for wireless communication.
- the apparatus 900 may be a wireless node (such as the UE 120 or the BS 110), or a wireless node may include the apparatus 900.
- the apparatus 900 includes a reception component 902 and a transmission component 904, which may be in communication with one another (for example, via one or more buses or one or more other components).
- the apparatus 900 may communicate with another apparatus 906 (such as a UE, a BS, or another wireless node) using the reception component 902 and the transmission component 904.
- the apparatus 900 may include the communication manager 140.
- the communication manager 140 may include a communication component 908, among other examples.
- the apparatus 900 may be configured to perform one or more operations described herein in connection with Figures 4-6. Additionally, or alternatively, the apparatus 900 may be configured to perform one or more processes described herein, such as process 700 of Figure 700.
- the apparatus 900 or one or more components shown in Figure 9 may include one or more components of the wireless node described above in connection with Figure 2. Additionally, or alternatively, one or more components shown in Figure 9 may be implemented within one or more components described above in connection with Figure 2. Additionally, or alternatively, one or more components of the set of components may be implemented at least in part as software stored in a memory.
- a component may be implemented as instructions or code stored in a non-transitory computer-readable medium and executable by a controller or a processor to perform the functions or operations of the component.
- the reception component 902 may receive communications, such as reference signals, control information, data communications, or a combination thereof, from the apparatus 906.
- the reception component 902 may provide received communications to one or more other components of the apparatus 900.
- the reception component 902 may perform signal processing on the received communications (such as filtering, amplification, demodulation, analog-to-digital conversion, demultiplexing, deinterleaving, de-mapping, equalization, interference cancellation, or decoding, among other examples), and may provide the processed signals to the one or more other components of the apparatus 906.
- the reception component 902 may include one or more antennas, a demodulator, a MIMO detector, a receive processor, a controller/processor, a memory, or a combination thereof, of the wireless node described above in connection with Figure 2.
- the reception component 902 may be coupled to or may communicate with a radio communication component, which may include one or more antennas, a modulator, a transmit MIMO processor, a transmit processor, a controller/processor, a memory, or a combination thereof.
- a radio communication component which may include one or more antennas, a modulator, a transmit MIMO processor, a transmit processor, a controller/processor, a memory, or a combination thereof.
- the reception component 902 may receive information derived from signals received by the radio communication component.
- the transmission component 904 may transmit communications, such as reference signals, control information, data communications, or a combination thereof, to the apparatus 906.
- one or more other components of the apparatus 906 may generate communications and may provide the generated communications to the transmission component 904 for transmission to the apparatus 906.
- the transmission component 904 may perform signal processing on the generated communications (such as fdtering, amplification, modulation, digital-to-analog conversion, multiplexing, interleaving, mapping, or encoding, among other examples), and may transmit the processed signals to the apparatus 906.
- the transmission component 904 may include one or more antennas, a modulator, a transmit MIMO processor, a transmit processor, a controller/processor, a memory, or a combination thereof, of the wireless node described above in connection with Figure 2.
- the transmission component 904 may be co-located with the reception component 902 in a transceiver.
- the transmission component 904 may be coupled to or may communicate with a radio communication component, which may include one or more antennas, a modulator, a transmit MIMO processor, a transmit processor, a controller/processor, a memory, or a combination thereof.
- the transmission component 904 may provide information regarding signals to be transmitted by the radio communication component.
- the reception component 902 may receive a downlink RACH message including a PTRS.
- the communication component 908 may perform a communication associated with the downlink RACH message.
- the reception component 902 may receive an indication that the downlink RACH message includes the PTRS.
- the reception component 902 may receive one or more parameters associated with the PTRS via system information.
- the reception component 902 may receive multiple repetitions of the downlink RACH message including the PTRS.
- the communication component 908 may perform phase error correction for the multiple repetitions using the PTRS.
- the communication component 908 may perform frequency error correction for the downlink RACH message using the PTRS.
- FIG. 9 is a block diagram of an example apparatus 1000 for wireless communication.
- the apparatus 1000 may be a component of a wireless node such as a BS (such as a component of the BS 110, a central unit, a distributed unit, a radio unit, or a combination thereof), or a component of a wireless node may include the apparatus 1000.
- the apparatus 1000 includes a reception component 1002 and a transmission component 1004, which may be in communication with one another (for example, via one or more buses or one or more other components).
- the apparatus 1000 may communicate with another apparatus 1006 (such as a UE, a BS, or another wireless node) using the reception component 1002 and the transmission component 1004.
- the apparatus 1000 may include the communication manager 150.
- the communication manager 150 may include a communication component 1008, among other examples.
- the apparatus 1000 may be configured to perform one or more operations described herein in connection with Figures 4-6. Additionally, or alternatively, the apparatus 1000 may be configured to perform one or more processes described herein, such as process 800 of Figure 8.
- the apparatus 1000 or one or more components shown in Figure 10 may include one or more components of the base station described above in connection with Figure 2. Additionally, or alternatively, one or more components shown in Figure 10 may be implemented within one or more components described above in connection with Figure 2. Additionally, or alternatively, one or more components of the set of components may be implemented at least in part as software stored in a memory.
- a component may be implemented as instructions or code stored in a non-transitory computer-readable medium and executable by a controller or a processor to perform the functions or operations of the component.
- the reception component 1002 may receive communications, such as reference signals, control information, data communications, or a combination thereof, from the apparatus 1006.
- the reception component 1002 may provide received communications to one or more other components of the apparatus 1000.
- the reception component 1002 may perform signal processing on the received communications (such as filtering, amplification, demodulation, analog-to-digital conversion, demultiplexing, deinterleaving, de-mapping, equalization, interference cancellation, or decoding, among other examples), and may provide the processed signals to the one or more other components of the apparatus 1006.
- the reception component 1002 may include one or more antennas, a demodulator, a MIMO detector, a receive processor, a controller/processor, a memory, or a combination thereof, of the BS described above in connection with Figure 2.
- the reception component 1002 may be coupled to or may communicate with a radio communication component, which may include one or more antennas, a modulator, a transmit MIMO processor, a transmit processor, a controller/processor, a memory, or a combination thereof.
- a radio communication component which may include one or more antennas, a modulator, a transmit MIMO processor, a transmit processor, a controller/processor, a memory, or a combination thereof.
- the reception component 1002 may receive information derived from signals received by the radio communication component.
- the transmission component 1004 may transmit communications, such as reference signals, control information, data communications, or a combination thereof, to the apparatus 1006.
- one or more other components of the apparatus 1006 may generate communications and may provide the generated communications to the transmission component 1004 for transmission to the apparatus 1006.
- the transmission component 1004 may perform signal processing on the generated communications (such as filtering, amplification, modulation, digital-to-analog conversion, multiplexing, interleaving, mapping, or encoding, among other examples), and may transmit the processed signals to the apparatus 1006.
- the transmission component 1004 may include one or more antennas, a modulator, a transmit MIMO processor, a transmit processor, a controller/processor, a memory, or a combination thereof, of the base station described above in connection with Figure 2.
- the transmission component 1004 may be co located with the reception component 1002 in a transceiver.
- the transmission component 1004 may be coupled to or may communicate with a radio communication component, which may include one or more antennas, a modulator, a transmit MIMO processor, a transmit processor, a controller/processor, a memory, or a combination thereof.
- the transmission component 1004 may provide information regarding signals to be transmitted by the radio communication component.
- the transmission component 1004 may transmit a downlink RACH message including a phase PTRS.
- the communication component 1008 may perform a communication associated with the downlink RACH message.
- the transmission component 1004 may transmit an indication that the downlink RACH message includes the PTRS.
- the transmission component 1004 may transmit one or more parameters associated with the PTRS via system information.
- the transmission component 1004 may transmit multiple repetitions of the downlink RACH message including the PTRS.
- FIG. 10 The number and arrangement of components shown in Figure 10 are provided as an example. In practice, there may be additional components, fewer components, different components, or differently arranged components than those shown in Figure 10. Furthermore, two or more components shown in Figure 10 may be implemented within a single component, or a single component shown in Figure 10 may be implemented as multiple, distributed components. Additionally, or alternatively, a set of (one or more) components shown in Figure 10 may perform one or more functions described as being performed by another set of components shown in Figure 10.
- 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.
- the phrase “based on” is intended to be broadly construed to mean “based at least in part on.”
- 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, or not equal to the threshold, among other examples.
- 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.
- the articles “a” and “an” are intended to include one or more items and may be used interchangeably with “one or more.”
- the article “the” is intended to include one or more items referenced in connection with the article “the” and may be used interchangeably with “the one or more.”
- the terms “set” and “group” are intended to include one or more items (for example, related items, unrelated items, or a combination of related and unrelated items), and may be used interchangeably with “one or more.” Where only one item is intended, the phrase “only one” or similar language is used.
- the terms “has,” “have,” “having,” and similar terms are intended to be open-ended terms.
- the term “or” is intended to be inclusive when used in a series and may be used interchangeably with “and/or,” unless explicitly stated otherwise (for example, if used in combination with “either” or “only one of’).
- the hardware and data processing apparatus used to implement the various illustrative logics, logical blocks, modules and circuits described in connection with the aspects disclosed herein may be implemented or performed with a general purpose single- or multi-chip processor, a digital signal processor (DSP), an application specific integrated circuit (ASIC), a field programmable gate array (FPGA) or other programmable logic device, discrete gate or transistor logic, discrete hardware components, or any combination thereof designed to perform the functions described herein.
- a general purpose processor may be a microprocessor, or any conventional processor, controller, microcontroller, or state machine.
- a processor also may be implemented as a combination of computing devices, for example, a combination of a DSP and a microprocessor, a plurality of microprocessors, one or more microprocessors in conjunction with a DSP core, or any other such configuration.
- particular processes and methods may be performed by circuitry that is specific to a given function.
- the functions described may be implemented in hardware, digital electronic circuitry, computer software, firmware, including the structures disclosed in this specification and their structural equivalents thereof, or in any combination thereof. Aspects of the subject matter described in this specification also can be implemented as one or more computer programs (such as one or more modules of computer program instructions) encoded on a computer storage media for execution by, or to control the operation of, a data processing apparatus. [0161] If implemented in software, the functions may be stored on or transmitted over as one or more instructions or code on a computer-readable medium. The processes of a method or algorithm disclosed herein may be implemented in a processor-executable software module which may reside on a computer-readable medium.
- Computer-readable media includes both computer storage media and communication media including any medium that can be enabled to transfer a computer program from one place to another.
- a storage media may be any available media that may be accessed by a computer.
- such computer-readable media may include RAM, ROM, EEPROM, CD-ROM or other optical disk storage, magnetic disk storage or other magnetic storage devices, or any other medium that may be used to store desired program code in the form of instructions or data structures and that may be accessed by a computer.
- any connection can be properly termed a computer-readable medium.
- Disk and disc includes compact disc (CD), laser disc, optical disc, digital versatile disc (DVD), floppy disk, and Blu- ray disc where disks usually reproduce data magnetically, while discs reproduce data optically with lasers. Combinations of the above should also be included within the scope of computer-readable media.
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EP22715302.0A EP4331164A1 (en) | 2021-04-29 | 2022-03-15 | Phase tracking reference signal (ptrs) for random access |
CN202280030195.7A CN117203929A (en) | 2021-04-29 | 2022-03-15 | Phase Tracking Reference Signal (PTRS) for random access |
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US202163201443P | 2021-04-29 | 2021-04-29 | |
US63/201,443 | 2021-04-29 | ||
US17/654,715 US20220353918A1 (en) | 2021-04-29 | 2022-03-14 | Phase tracking reference signal (ptrs) for random access |
US17/654,715 | 2022-03-14 |
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WO2020237452A1 (en) * | 2019-05-27 | 2020-12-03 | Qualcomm Incorporated | Phase tracking reference signal configuration for a random access procedure |
US20210100039A1 (en) * | 2019-09-26 | 2021-04-01 | Apple Inc. | Framework for Two-Step Random Access Channel Procedure in Wireless Communications |
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WO2020237452A1 (en) * | 2019-05-27 | 2020-12-03 | Qualcomm Incorporated | Phase tracking reference signal configuration for a random access procedure |
US20210100039A1 (en) * | 2019-09-26 | 2021-04-01 | Apple Inc. | Framework for Two-Step Random Access Channel Procedure in Wireless Communications |
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