WO2021092820A1 - Accès aléatoire basé sur des ressources d'accès aléatoire en semi-duplex et des ressources d'accès aléatoire en duplex intégral - Google Patents

Accès aléatoire basé sur des ressources d'accès aléatoire en semi-duplex et des ressources d'accès aléatoire en duplex intégral Download PDF

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Publication number
WO2021092820A1
WO2021092820A1 PCT/CN2019/118297 CN2019118297W WO2021092820A1 WO 2021092820 A1 WO2021092820 A1 WO 2021092820A1 CN 2019118297 W CN2019118297 W CN 2019118297W WO 2021092820 A1 WO2021092820 A1 WO 2021092820A1
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WIPO (PCT)
Prior art keywords
random access
access resources
base station
resources
resource
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PCT/CN2019/118297
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English (en)
Inventor
Yuwei REN
Min Huang
Chao Wei
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Qualcomm Incorporated
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Application filed by Qualcomm Incorporated filed Critical Qualcomm Incorporated
Priority to PCT/CN2019/118297 priority Critical patent/WO2021092820A1/fr
Publication of WO2021092820A1 publication Critical patent/WO2021092820A1/fr

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    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04W—WIRELESS COMMUNICATION NETWORKS
    • H04W74/00—Wireless channel access
    • H04W74/08—Non-scheduled access, e.g. ALOHA
    • H04W74/0833—Random access procedures, e.g. with 4-step access

Definitions

  • the present disclosure relates generally to communication systems, and more particularly, wireless communication including random access between a user equipment (UE) and a base station.
  • UE user equipment
  • 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. Examples of such 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, and time division synchronous code division multiple access (TD-SCDMA) systems.
  • CDMA code division multiple access
  • TDMA time division multiple access
  • FDMA frequency division multiple access
  • OFDMA orthogonal frequency division multiple access
  • SC-FDMA single-carrier frequency division multiple access
  • TD-SCDMA time division synchronous code division multiple access
  • 5G New Radio is part of a continuous mobile broadband evolution promulgated by Third Generation Partnership Project (3GPP) to meet new requirements associated with latency, reliability, security, scalability (e.g., with Internet of Things (IoT) ) , and other requirements.
  • 3GPP Third Generation Partnership Project
  • 5G NR includes services associated with enhanced mobile broadband (eMBB) , massive machine type communications (mMTC) , and ultra reliable low latency communications (URLLC) .
  • eMBB enhanced mobile broadband
  • mMTC massive machine type communications
  • URLLC ultra reliable low latency communications
  • 5G NR may be based on the 4G Long Term Evolution (LTE) standard.
  • LTE Long Term Evolution
  • Resources that are dedicated for random access without other downlink or uplink transmissions for the base station may avoid potential interference.
  • such dedicated resources reduce the efficient use of wireless resources. Reducing the density of the resources may increase latency for establishing a connection with a UE.
  • the base station may divide random access resources in a random access pattern into two sets of random access resources.
  • a first set of random access resources may be associated with half-duplex operation of the base station without other downlink or uplink transmissions.
  • the other set of random access resources may be capable of use with full-duplex mode operation by the base station.
  • the second set of random access resources may be capable of overlapping use by another channel.
  • a base station may configure the two sets of random access resources.
  • a UE may select between the two sets of random access resources in order to transmit a random access preamble.
  • the UE and/or the base station may perform power control based on the set of random access resources.
  • a method, a computer-readable medium, and an apparatus are provided for wireless communication at a base station.
  • the apparatus configures a first set of random access resources and a second set of random access resources, wherein the first set of random access resources are reserved for a half-duplex mode. Then, the apparatus operates using the half-duplex mode during the first set of random access resources.
  • a method, a computer-readable medium, and an apparatus are provided for wireless communication at a UE.
  • the apparatus selects a resource from a first set of random access resources and a second set of random access resources, wherein the first set of random access resources are reserved for a half-duplex mode. Then, the apparatus transmits a random access message to a base station using the selected resource.
  • the one or more aspects comprise the features hereinafter fully described and particularly pointed out in the claims.
  • the following description and the annexed drawings set forth in detail certain illustrative features of the one or more aspects. These features are indicative, however, of but a few of the various ways in which the principles of various aspects may be employed, and this description is intended to include all such aspects and their equivalents.
  • FIG. 1 is a diagram illustrating an example of a wireless communications system and an access network.
  • FIGs. 2A, 2B, 2C, and 2D are diagrams illustrating examples of a first 5G/NR frame, DL channels within a 5G/NR subframe, a second 5G/NR frame, and UL channels within a 5G/NR subframe, respectively.
  • FIG. 3 is a diagram illustrating an example of a base station and user equipment (UE) in an access network.
  • UE user equipment
  • FIG. 4 illustrates an example random access procedure between a UE and a base station.
  • FIG. 5 illustrates example aspects of time and frequency resources for random access.
  • FIG. 6 illustrates an example of a base station in a full-duplex mode.
  • FIG. 7 illustrates an example of different types of random access resources.
  • FIG. 8 illustrates an example pattern of random access resources.
  • FIG. 9 illustrates an example pattern including two sets of random access resources.
  • FIG. 10 illustrates an example communication flow between a UE and a base station.
  • FIG. 11 illustrates an example of different transmit power for different types of random access resources.
  • FIG. 12 illustrates an example of power control by a base station during full-duplex random access resources.
  • FIG. 13 is a flowchart of a method of wireless communication.
  • FIG. 14 is a conceptual data flow diagram illustrating the data flow between different means/components in an example apparatus.
  • FIG. 15 is a diagram illustrating an example of a hardware implementation for an apparatus employing a processing system.
  • FIG. 16 is a flowchart of a method of wireless communication.
  • FIG. 17 is a conceptual data flow diagram illustrating the data flow between different means/components in an example apparatus.
  • FIG. 18 is a diagram illustrating an example of a hardware implementation for an apparatus employing a processing system.
  • Resources that are dedicated for random access without other downlink or uplink transmissions for the base station may avoid potential interference.
  • such dedicated resources reduce the efficient use of wireless resources. Reducing the density of the resources may increase latency for establishing a connection with a UE.
  • the base station may divide random access resources in a random access pattern into two sets of random access resources.
  • a first set of random access resources may be associated with half-duplex operation of the base station without other downlink or uplink transmissions.
  • the other set of random access resources may be capable of use with full-duplex mode operation by the base station.
  • the second set of random access resources may be capable of overlapping use by another channel.
  • a base station may configure the two sets of random access resources.
  • a UE may select between the two sets of random access resources in order to transmit a random access preamble.
  • the UE and/or the base station may perform power control based on the set of random access resources.
  • processors include microprocessors, microcontrollers, graphics processing units (GPUs) , central processing units (CPUs) , application processors, digital signal processors (DSPs) , reduced instruction set computing (RISC) processors, systems on a chip (SoC) , baseband processors, field programmable gate arrays (FPGAs) , programmable logic devices (PLDs) , state machines, gated logic, discrete hardware circuits, and other suitable hardware configured to perform the various functionality described throughout this disclosure.
  • processors in the processing system may execute software.
  • Software shall be construed broadly to mean instructions, instruction sets, code, code segments, program code, programs, subprograms, software components, applications, software applications, software packages, routines, subroutines, objects, executables, threads of execution, procedures, functions, etc., whether referred to as software, firmware, middleware, microcode, hardware description language, or otherwise.
  • the functions described may be implemented in hardware, software, or any combination thereof. If implemented in software, the functions may be stored on or encoded as one or more instructions or code on a computer-readable medium.
  • Computer-readable media includes computer storage media. Storage media may be any available media that can be accessed by a computer.
  • such computer-readable media can comprise a random-access memory (RAM) , a read-only memory (ROM) , an electrically erasable programmable ROM (EEPROM) , optical disk storage, magnetic disk storage, other magnetic storage devices, combinations of the aforementioned types of computer-readable media, or any other medium that can be used to store computer executable code in the form of instructions or data structures that can be accessed by a computer.
  • RAM random-access memory
  • ROM read-only memory
  • EEPROM electrically erasable programmable ROM
  • optical disk storage magnetic disk storage
  • magnetic disk storage other magnetic storage devices
  • combinations of the aforementioned types of computer-readable media or any other medium that can be used to store computer executable code in the form of instructions or data structures that can be accessed by a computer.
  • FIG. 1 is a diagram illustrating an example of a wireless communications system and an access network 100.
  • the wireless communications system (also referred to as a wireless wide area network (WWAN) ) includes base stations 102, UEs 104, an Evolved Packet Core (EPC) 160, and another core network 190 (e.g., a 5G Core (5GC) ) .
  • the base stations 102 may include macrocells (high power cellular base station) and/or small cells (low power cellular base station) .
  • the macrocells include base stations.
  • the small cells include femtocells, picocells, and microcells.
  • the base stations 102 configured for 4G LTE may interface with the EPC 160 through first backhaul links 132 (e.g., S1 interface) .
  • the base stations 102 configured for 5G NR may interface with core network 190 through second backhaul links 184.
  • the base stations 102 may perform one or more of the following functions: transfer of user data, radio channel ciphering and deciphering, integrity protection, header compression, mobility control functions (e.g., handover, dual connectivity) , inter-cell interference coordination, connection setup and release, load balancing, distribution for non-access stratum (NAS) messages, NAS node selection, synchronization, radio access network (RAN) sharing, multimedia broadcast multicast service (MBMS) , subscriber and equipment trace, RAN information management (RIM) , paging, positioning, and delivery of warning messages.
  • NAS non-access stratum
  • RAN radio access network
  • MBMS multimedia broadcast multicast service
  • RIM RAN information management
  • the base stations 102 may communicate directly or indirectly (e.g., through the EPC 160 or core network 190) with each other over third backhaul links 134 (e.g., X2 interface) .
  • the third backhaul links 134 may be wired or wireless.
  • the base stations 102 may wirelessly communicate with the UEs 104. Each of the base stations 102 may provide communication coverage for a respective geographic coverage area 110. There may be overlapping geographic coverage areas 110. For example, the small cell 102' may have a coverage area 110' that overlaps the coverage area 110 of one or more macro base stations 102.
  • a network that includes both small cell and macrocells may be known as a heterogeneous network.
  • a heterogeneous network may also include Home Evolved Node Bs (eNBs) (HeNBs) , which may provide service to a restricted group known as a closed subscriber group (CSG) .
  • eNBs Home Evolved Node Bs
  • HeNBs Home Evolved Node Bs
  • CSG closed subscriber group
  • the communication links 120 between the base stations 102 and the UEs 104 may include uplink (UL) (also referred to as reverse link) transmissions from a UE 104 to a base station 102 and/or downlink (DL) (also referred to as forward link) transmissions from a base station 102 to a UE 104.
  • the communication links 120 may use multiple-input and multiple-output (MIMO) antenna technology, including spatial multiplexing, beamforming, and/or transmit diversity.
  • the communication links may be through one or more carriers.
  • the base stations 102 /UEs 104 may use spectrum up to Y MHz (e.g., 5, 10, 15, 20, 100, 400, etc.
  • the component carriers may include a primary component carrier and one or more secondary component carriers.
  • a primary component carrier may be referred to as a primary cell (PCell) and a secondary component carrier may be referred to as a secondary cell (SCell) .
  • D2D communication link 158 may use the DL/UL WWAN spectrum.
  • the D2D communication link 158 may use one or more sidelink channels, such as a physical sidelink broadcast channel (PSBCH) , a physical sidelink discovery channel (PSDCH) , a physical sidelink shared channel (PSSCH) , and a physical sidelink control channel (PSCCH) .
  • sidelink channels such as a physical sidelink broadcast channel (PSBCH) , a physical sidelink discovery channel (PSDCH) , a physical sidelink shared channel (PSSCH) , and a physical sidelink control channel (PSCCH) .
  • sidelink channels such as a physical sidelink broadcast channel (PSBCH) , a physical sidelink discovery channel (PSDCH) , a physical sidelink shared channel (PSSCH) , and a physical sidelink control channel (PSCCH) .
  • D2D communication may be through a variety of wireless D2D communications systems, such as for example, FlashLinQ, WiMedia,
  • the wireless communications system may further include a Wi-Fi access point (AP) 150 in communication with Wi-Fi stations (STAs) 152 via communication links 154 in a 5 GHz unlicensed frequency spectrum.
  • AP Wi-Fi access point
  • STAs Wi-Fi stations
  • communication links 154 in a 5 GHz unlicensed frequency spectrum.
  • the STAs 152 /AP 150 may perform a clear channel assessment (CCA) prior to communicating in order to determine whether the channel is available.
  • CCA clear channel assessment
  • the small cell 102' may operate in a licensed and/or an unlicensed frequency spectrum. When operating in an unlicensed frequency spectrum, the small cell 102' may employ NR and use the same 5 GHz unlicensed frequency spectrum as used by the Wi-Fi AP 150. The small cell 102', employing NR in an unlicensed frequency spectrum, may boost coverage to and/or increase capacity of the access network.
  • a base station 102 may include and/or be referred to as an eNB, gNodeB (gNB) , or another type of base station.
  • Some base stations 180 such as a gNB, may operate in a traditional sub 6 GHz spectrum, in millimeter wave (mmW) frequencies, and/or near mmW frequencies in communication with the UE 104.
  • mmW millimeter wave
  • mmW base station Extremely high frequency (EHF) is part of the RF in the electromagnetic spectrum.
  • EHF Extremely high frequency
  • EHF has a range of 30 GHz to 300 GHz and a wavelength between 1 millimeter and 10 millimeters. Radio waves in the band may be referred to as a millimeter wave. Near mmW may extend down to a frequency of 3 GHz with a wavelength of 100 millimeters.
  • the super high frequency (SHF) band extends between 3 GHz and 30 GHz, also referred to as centimeter wave. Communications using the mmW /near mmW radio frequency band (e.g., 3 GHz –300 GHz) has extremely high path loss and a short range.
  • the mmW base station e.g., base station 180, may utilize beamforming 182 with the UE 104 to compensate for the extremely high path loss and short range.
  • the base station 180 and the UE 104 may each include a plurality of antennas, such as antenna elements, antenna panels, and/or antenna arrays to facilitate the beamforming.
  • the base station 180 may transmit a beamformed signal to the UE 104 in one or more transmit directions 182'.
  • the UE 104 may receive the beamformed signal from the base station 180 in one or more receive directions 182".
  • the UE 104 may also transmit a beamformed signal to the base station 180 in one or more transmit directions.
  • the base station 180 may receive the beamformed signal from the UE 104 in one or more receive directions.
  • the base station 180 /UE 104 may perform beam training to determine the best receive and transmit directions for each of the base station 180 /UE 104.
  • the transmit and receive directions for the base station 180 may or may not be the same.
  • the transmit and receive directions for the UE 104 may or may not be the same.
  • the EPC 160 may include a Mobility Management Entity (MME) 162, other MMEs 164, a Serving Gateway 166, a Multimedia Broadcast Multicast Service (MBMS) Gateway 168, a Broadcast Multicast Service Center (BM-SC) 170, and a Packet Data Network (PDN) Gateway 172.
  • MME Mobility Management Entity
  • MBMS Multimedia Broadcast Multicast Service
  • BM-SC Broadcast Multicast Service Center
  • PDN Packet Data Network
  • the MME 162 may be in communication with a Home Subscriber Server (HSS) 174.
  • HSS Home Subscriber Server
  • the MME 162 is the control node that processes the signaling between the UEs 104 and the EPC 160.
  • the MME 162 provides bearer and connection management. All user Internet protocol (IP) packets are transferred through the Serving Gateway 166, which itself is connected to the PDN Gateway 172.
  • IP Internet protocol
  • the PDN Gateway 172 provides UE IP address allocation as well as other functions.
  • the PDN Gateway 172 and the BM-SC 170 are connected to the IP Services 176.
  • the IP Services 176 may include the Internet, an intranet, an IP Multimedia Subsystem (IMS) , a PS Streaming Service, and/or other IP services.
  • the BM-SC 170 may provide functions for MBMS user service provisioning and delivery.
  • the BM-SC 170 may serve as an entry point for content provider MBMS transmission, may be used to authorize and initiate MBMS Bearer Services within a public land mobile network (PLMN) , and may be used to schedule MBMS transmissions.
  • PLMN public land mobile network
  • the MBMS Gateway 168 may be used to distribute MBMS traffic to the base stations 102 belonging to a Multicast Broadcast Single Frequency Network (MBSFN) area broadcasting a particular service, and may be responsible for session management (start/stop) and for collecting eMBMS related charging information.
  • MMSFN Multicast Broadcast Single Frequency Network
  • the core network 190 may include a Access and Mobility Management Function (AMF) 192, other AMFs 193, a Session Management Function (SMF) 194, and a User Plane Function (UPF) 195.
  • the AMF 192 may be in communication with a Unified Data Management (UDM) 196.
  • the AMF 192 is the control node that processes the signaling between the UEs 104 and the core network 190.
  • the AMF 192 provides QoS flow and session management. All user Internet protocol (IP) packets are transferred through the UPF 195.
  • the UPF 195 provides UE IP address allocation as well as other functions.
  • the UPF 195 is connected to the IP Services 197.
  • the IP Services 197 may include the Internet, an intranet, an IP Multimedia Subsystem (IMS) , a PS Streaming Service, and/or other IP services.
  • IMS IP Multimedia Subsystem
  • the base station may include and/or be referred to as a gNB, Node B, eNB, an access point, a base transceiver station, a radio base station, a radio transceiver, a transceiver function, a basic service set (BSS) , an extended service set (ESS) , a transmit reception point (TRP) , or some other suitable terminology.
  • the base station 102 provides an access point to the EPC 160 or core network 190 for a UE 104.
  • Examples of UEs 104 include a cellular phone, a smart phone, a session initiation protocol (SIP) phone, a laptop, a personal digital assistant (PDA) , a satellite radio, a global positioning system, a multimedia device, a video device, a digital audio player (e.g., MP3 player) , a camera, a game console, a tablet, a smart device, a wearable device, a vehicle, an electric meter, a gas pump, a large or small kitchen appliance, a healthcare device, an implant, a sensor/actuator, a display, or any other similar functioning device.
  • SIP session initiation protocol
  • PDA personal digital assistant
  • the UEs 104 may be referred to as IoT devices (e.g., parking meter, gas pump, toaster, vehicles, heart monitor, etc. ) .
  • the UE 104 may also be referred to as a station, a mobile station, a subscriber station, a mobile unit, a subscriber unit, a wireless unit, a remote unit, a mobile device, a wireless device, a wireless communications device, a remote device, a mobile subscriber station, an access terminal, a mobile terminal, a wireless terminal, a remote terminal, a handset, a user agent, a mobile client, a client, or some other suitable terminology.
  • Random access resources may be configured in a first set of random access resources and a second set of random access resources, where the first set of random access resources are reserved for a half-duplex mode.
  • the base station operates using the half-duplex mode during the first set of random access resources.
  • the base station 102/180 may include a dual random access pattern component 199 that configures the first and the second sets of random access resources.
  • the base station 102/180 may operate using the half-duplex mode during the first set of random access resources.
  • the base station may provide configuration information to the UE 104 regarding the use of the first or second set of random access resources.
  • the UE 104 may include a random access component 198 configured to select a resource from a first set of random access resources and a second set of random access resources, wherein the first set of random access resources are reserved for a half-duplex mode. Then, random access component 198 may be configured to transmit a random access message to the base station 102/180 using the selected time resource.
  • 5G NR the concepts described herein may be applicable to other similar areas, such as LTE, LTE-A, CDMA, GSM, and other wireless technologies.
  • FIG. 2A is a diagram 200 illustrating an example of a first subframe within a 5G/NR frame structure.
  • FIG. 2B is a diagram 230 illustrating an example of DL channels within a 5G/NR subframe.
  • FIG. 2C is a diagram 250 illustrating an example of a second subframe within a 5G/NR frame structure.
  • FIG. 2D is a diagram 280 illustrating an example of UL channels within a 5G/NR subframe.
  • the 5G/NR frame structure may be FDD in which for a particular set of subcarriers (carrier system bandwidth) , subframes within the set of subcarriers are dedicated for either DL or UL, or may be TDD in which for a particular set of subcarriers (carrier system bandwidth) , subframes within the set of subcarriers are dedicated for both DL and UL.
  • the 5G/NR frame structure is assumed to be TDD, with subframe 4 being configured with slot format 28 (with mostly DL) , where D is DL, U is UL, and X is flexible for use between DL/UL, and subframe 3 being configured with slot format 34 (with mostly UL) .
  • slot formats 0, 1 are all DL, UL, respectively.
  • Other slot formats 2-61 include a mix of DL, UL, and flexible symbols.
  • UEs are configured with the slot format (dynamically through DL control information (DCI) , or semi-statically/statically through radio resource control (RRC) signaling) through a received slot format indicator (SFI) .
  • DCI DL control information
  • RRC radio resource control
  • SFI received slot format indicator
  • a frame (10 ms) may be divided into 10 equally sized subframes (1 ms) .
  • Each subframe may include one or more time slots.
  • Subframes may also include mini-slots, which may include 7, 4, or 2 symbols.
  • Each slot may include 7 or 14 symbols, depending on the slot configuration. For slot configuration 0, each slot may include 14 symbols, and for slot configuration 1, each slot may include 7 symbols.
  • the symbols on DL may be cyclic prefix (CP) OFDM (CP-OFDM) symbols.
  • the symbols on UL may be CP-OFDM symbols (for high throughput scenarios) or discrete Fourier transform (DFT) spread OFDM (DFT-s-OFDM) symbols (also referred to as single carrier frequency-division multiple access (SC-FDMA) symbols) (for power limited scenarios; limited to a single stream transmission) .
  • the number of slots within a subframe is based on the slot configuration and the numerology. For slot configuration 0, different numerologies ⁇ 0 to 5 allow for 1, 2, 4, 8, 16, and 32 slots, respectively, per subframe. For slot configuration 1, different numerologies 0 to 2 allow for 2, 4, and 8 slots, respectively, per subframe. Accordingly, for slot configuration 0 and numerology ⁇ , there are 14 symbols/slot and 2 ⁇ slots/subframe.
  • the subcarrier spacing and symbol length/duration are a function of the numerology.
  • the subcarrier spacing may be equal to 2 ⁇ *15 kHz, where ⁇ is the numerology 0 to 5.
  • ⁇ is the numerology 0 to 5.
  • the symbol length/duration is inversely related to the subcarrier spacing.
  • the subcarrier spacing is 15 kHz and symbol duration is approximately 66.7 ⁇ s.
  • a resource grid may be used to represent the frame structure.
  • Each time slot includes a resource block (RB) (also referred to as physical RBs (PRBs) ) that extends 12 consecutive subcarriers.
  • RB resource block
  • PRBs physical RBs
  • the resource grid is divided into multiple resource elements (REs) . The number of bits carried by each RE depends on the modulation scheme.
  • the RS may include demodulation RS (DM-RS) (indicated as R x for one particular configuration, where 100x is the port number, but other DM-RS configurations are possible) and channel state information reference signals (CSI-RS) for channel estimation at the UE.
  • DM-RS demodulation RS
  • CSI-RS channel state information reference signals
  • the RS may also include beam measurement RS (BRS) , beam refinement RS (BRRS) , and phase tracking RS (PT-RS) .
  • BRS beam measurement RS
  • BRRS beam refinement RS
  • PT-RS phase tracking RS
  • FIG. 2B illustrates an example of various DL channels within a subframe of a frame.
  • the physical downlink control channel (PDCCH) carries DCI within one or more control channel elements (CCEs) , each CCE including nine RE groups (REGs) , each REG including four consecutive REs in an OFDM symbol.
  • a primary synchronization signal (PSS) may be within symbol 2 of particular subframes of a frame. The PSS is used by a UE 104 to determine subframe/symbol timing and a physical layer identity.
  • a secondary synchronization signal (SSS) may be within symbol 4 of particular subframes of a frame. The SSS is used by a UE to determine a physical layer cell identity group number and radio frame timing.
  • the UE can determine a physical cell identifier (PCI) . Based on the PCI, the UE can determine the locations of the aforementioned DM-RS.
  • the physical broadcast channel (PBCH) which carries a master information block (MIB) , may be logically grouped with the PSS and SSS to form a synchronization signal (SS) /PBCH block.
  • the MIB provides a number of RBs in the system bandwidth and a system frame number (SFN) .
  • the physical downlink shared channel (PDSCH) carries user data, broadcast system information not transmitted through the PBCH such as system information blocks (SIBs) , and paging messages.
  • SIBs system information blocks
  • some of the REs carry DM-RS (indicated as R for one particular configuration, but other DM-RS configurations are possible) for channel estimation at the base station.
  • the UE may transmit DM-RS for the physical uplink control channel (PUCCH) and DM-RS for the physical uplink shared channel (PUSCH) .
  • the PUSCH DM-RS may be transmitted in the first one or two symbols of the PUSCH.
  • the PUCCH DM-RS may be transmitted in different configurations depending on whether short or long PUCCHs are transmitted and depending on the particular PUCCH format used.
  • the UE may transmit sounding reference signals (SRS) .
  • the SRS may be used by a base station for channel quality estimation to enable frequency-dependent scheduling on the UL.
  • FIG. 2D illustrates an example of various UL channels within a subframe of a frame.
  • the PUCCH may be located as indicated in one configuration.
  • the PUCCH carries uplink control information (UCI) , such as scheduling requests, a channel quality indicator (CQI) , a precoding matrix indicator (PMI) , a rank indicator (RI) , and HARQ ACK/NACK feedback.
  • UCI uplink control information
  • the PUSCH carries data, and may additionally be used to carry a buffer status report (BSR) , a power headroom report (PHR) , and/or UCI.
  • BSR buffer status report
  • PHR power headroom report
  • FIG. 3 is a block diagram of a base station 310 in communication with a UE 350 in an access network.
  • IP packets from the EPC 160 may be provided to a controller/processor 375.
  • the controller/processor 375 implements layer 3 and layer 2 functionality.
  • Layer 3 includes a radio resource control (RRC) layer
  • layer 2 includes a service data adaptation protocol (SDAP) layer, a packet data convergence protocol (PDCP) layer, a radio link control (RLC) layer, and a medium access control (MAC) layer.
  • RRC radio resource control
  • SDAP service data adaptation protocol
  • PDCP packet data convergence protocol
  • RLC radio link control
  • MAC medium access control
  • the controller/processor 375 provides RRC layer functionality associated with broadcasting of system information (e.g., MIB, SIBs) , RRC connection control (e.g., RRC connection paging, RRC connection establishment, RRC connection modification, and RRC connection release) , inter radio access technology (RAT) mobility, and measurement configuration for UE measurement reporting; PDCP layer functionality associated with header compression /decompression, security (ciphering, deciphering, integrity protection, integrity verification) , and handover support functions; RLC layer functionality associated with the transfer of upper layer packet data units (PDUs) , error correction through ARQ, concatenation, segmentation, and reassembly of RLC service data units (SDUs) , re-segmentation of RLC data PDUs, and reordering of RLC data PDUs; and MAC layer functionality associated with mapping between logical channels and transport channels, multiplexing of MAC SDUs onto transport blocks (TBs) , demultiplexing of MAC SDU
  • the transmit (TX) processor 316 and the receive (RX) processor 370 implement layer 1 functionality associated with various signal processing functions.
  • Layer 1 which includes a physical (PHY) layer, may include error detection on the transport channels, forward error correction (FEC) coding/decoding of the transport channels, interleaving, rate matching, mapping onto physical channels, modulation/demodulation of physical channels, and MIMO antenna processing.
  • the TX processor 316 handles mapping to signal constellations based on various modulation schemes (e.g., binary phase-shift keying (BPSK) , quadrature phase-shift keying (QPSK) , M-phase-shift keying (M-PSK) , M-quadrature amplitude modulation (M-QAM) ) .
  • BPSK binary phase-shift keying
  • QPSK quadrature phase-shift keying
  • M-PSK M-phase-shift keying
  • M-QAM M-quadrature amplitude modulation
  • the coded and modulated symbols may then be split into parallel streams.
  • Each stream may then be mapped to an OFDM subcarrier, multiplexed with a reference signal (e.g., pilot) in the time and/or frequency domain, and then combined together using an Inverse Fast Fourier Transform (IFFT) to produce a physical channel carrying a time domain OFDM symbol stream.
  • IFFT Inverse Fast Fourier Transform
  • the OFDM stream is spatially precoded to produce multiple spatial streams.
  • Channel estimates from a channel estimator 374 may be used to determine the coding and modulation scheme, as well as for spatial processing.
  • the channel estimate may be derived from a reference signal and/or channel condition feedback transmitted by the UE 350.
  • Each spatial stream may then be provided to a different antenna 320 via a separate transmitter 318TX.
  • Each transmitter 318TX may modulate an RF carrier with a respective spatial stream for transmission.
  • each receiver 354RX receives a signal through its respective antenna 352.
  • Each receiver 354RX recovers information modulated onto an RF carrier and provides the information to the receive (RX) processor 356.
  • the TX processor 368 and the RX processor 356 implement layer 1 functionality associated with various signal processing functions.
  • the RX processor 356 may perform spatial processing on the information to recover any spatial streams destined for the UE 350. If multiple spatial streams are destined for the UE 350, they may be combined by the RX processor 356 into a single OFDM symbol stream.
  • the RX processor 356 then converts the OFDM symbol stream from the time-domain to the frequency domain using a Fast Fourier Transform (FFT) .
  • FFT Fast Fourier Transform
  • the frequency domain signal comprises a separate OFDM symbol stream for each subcarrier of the OFDM signal.
  • the symbols on each subcarrier, and the reference signal are recovered and demodulated by determining the most likely signal constellation points transmitted by the base station 310. These soft decisions may be based on channel estimates computed by the channel estimator 358.
  • the soft decisions are then decoded and deinterleaved to recover the data and control signals that were originally transmitted by the base station 310 on the physical channel.
  • the data and control signals are then provided to the controller/processor 359, which implements layer 3 and layer 2 functionality.
  • the controller/processor 359 can be associated with a memory 360 that stores program codes and data.
  • the memory 360 may be referred to as a computer-readable medium.
  • the controller/processor 359 provides demultiplexing between transport and logical channels, packet reassembly, deciphering, header decompression, and control signal processing to recover IP packets from the EPC 160.
  • the controller/processor 359 is also responsible for error detection using an ACK and/or NACK protocol to support HARQ operations.
  • the controller/processor 359 provides RRC layer functionality associated with system information (e.g., MIB, SIBs) acquisition, RRC connections, and measurement reporting; PDCP layer functionality associated with header compression /decompression, and security (ciphering, deciphering, integrity protection, integrity verification) ; RLC layer functionality associated with the transfer of upper layer PDUs, error correction through ARQ, concatenation, segmentation, and reassembly of RLC SDUs, re-segmentation of RLC data PDUs, and reordering of RLC data PDUs; and MAC layer functionality associated with mapping between logical channels and transport channels, multiplexing of MAC SDUs onto TBs, demultiplexing of MAC SDUs from TBs, scheduling information reporting, error correction through HARQ, priority handling, and logical channel prioritization.
  • RRC layer functionality associated with system information (e.g., MIB, SIBs) acquisition, RRC connections, and measurement reporting
  • PDCP layer functionality associated with
  • Channel estimates derived by a channel estimator 358 from a reference signal or feedback transmitted by the base station 310 may be used by the TX processor 368 to select the appropriate coding and modulation schemes, and to facilitate spatial processing.
  • the spatial streams generated by the TX processor 368 may be provided to different antenna 352 via separate transmitters 354TX. Each transmitter 354TX may modulate an RF carrier with a respective spatial stream for transmission.
  • the UL transmission is processed at the base station 310 in a manner similar to that described in connection with the receiver function at the UE 350.
  • Each receiver 318RX receives a signal through its respective antenna 320.
  • Each receiver 318RX recovers information modulated onto an RF carrier and provides the information to a RX processor 370.
  • the controller/processor 375 can be associated with a memory 376 that stores program codes and data.
  • the memory 376 may be referred to as a computer-readable medium.
  • the controller/processor 375 provides demultiplexing between transport and logical channels, packet reassembly, deciphering, header decompression, control signal processing to recover IP packets from the UE 350. IP packets from the controller/processor 375 may be provided to the EPC 160.
  • the controller/processor 375 is also responsible for error detection using an ACK and/or NACK protocol to support HARQ operations.
  • At least one of the TX processor 368, the RX processor 356, and the controller/processor 359 may be configured to perform aspects in connection with 198 of FIG. 1.
  • At least one of the TX processor 316, the RX processor 370, and the controller/processor 375 may be configured to perform aspects in connection with 199 of FIG. 1.
  • FIG. 4 illustrates example aspects of a random access procedure between a UE 402 and a base station 404.
  • the UE 402 may use a random access procedure 400 in order to communicate with the base station 404.
  • the UE 402 may use the random access procedure to request an RRC connection with the base station 404, to re-establish an RRC connection with the base station 404, to resume an RRC connection with the base station 404, etc.
  • the UE 402 may initiate the random access message exchange by sending, to the base station 404, a first random access message 403 (e.g., Msg 1) including a preamble.
  • First random access message 403 may be transmitted using a physical random access channel (PRACH) .
  • PRACH physical random access channel
  • the UE may obtain random access parameters, e.g., including preamble format parameters, time and frequency resources, parameters for determining root sequences and/or cyclic shifts for a random access preamble, etc., e.g., in system information 401 from the base station 404.
  • the system information 401 may enable the UE to obtain downlink synchronization information from the base station.
  • the preamble may be transmitted with an identifier, such as a Random Access RNTI (RA-RNTI) .
  • the UE 402 may randomly select a random access preamble sequence, e.g., from a set of preamble sequences.
  • a preamble sequence may be assigned to the UE 402.
  • the system information may indicate time domain resources for the first random access message 403.
  • the system information may include SIB2 including a PRACH configuration index that indicates the preamble format and when to transmit the preamble.
  • FIG. 5 illustrates a time and frequency diagram 500 showing an example time domain, e.g., S2, for a first random access message.
  • S0, S1, and S2 refer to a time duration.
  • the time duration may comprise a subframe, a number of subframes, etc.
  • the time domain e.g., a starting point in time for the resource, may be indicated using a system frame number and subframe number.
  • the time domain length may be indicated by the preamble format with the preamble transmitted in the location indicated by the system frame number and the subframe number.
  • the system information may indicate the frequency domain resources for the first random access message 403.
  • a RACH block may comprise contiguous subcarriers based on the preamble format, e.g., a frequency width or F_width in FIG. 5.
  • the RACH may include 839 contiguous subcarriers with a 1.25 KHz subcarrier spacing (SCS) .
  • SCS subcarrier spacing
  • the length may be calculated based on a 15 Khz frequency interval. As the frequency interval increases, e.g., 30 Khz, 60 Khz, 120 Khz, 240 Khz, the bandwidth of the RACH becomes larger.
  • the frequency resources for the random access message 403 may also be based on a frequency offset (e.g., F_offset) from a reference frequency. The frequency offset may be based on a parameter R_PRB_offset.
  • the base station 404 responds to the first random access message 403 by sending a second random access message 405 (e.g. Msg 2) using PDSCH or PDCCH and including a random access response (RAR) .
  • the RAR may include, e.g., an identifier of the random access preamble sent by the UE, a time advance (TA) , an uplink grant for the UE to transmit data, cell radio network temporary identifier (C-RNTI) or other identifier, and/or a back-off indicator.
  • TA time advance
  • C-RNTI cell radio network temporary identifier
  • the UE 402 may transmit a third random access message 407 (e.g., Msg 3) to the base station 404, e.g., using PUSCH, that may include a RRC connection request, an RRC connection re-establishment request, or an RRC connection resume request, depending on the trigger for the initiating the random access procedure.
  • the base station 404 may then complete the random access procedure by sending a fourth random access message 409 (e.g., Msg 4) to the UE 402, e.g., using PDCCH for scheduling and PDSCH for the message.
  • the fourth random access message 409 may include a random access response message that includes timing advancement information, contention resolution information, and/or RRC connection setup information.
  • the fourth random access message 409 may include an acknowledgement of the RRC connection request and/or a contention resolution ID (CRID) .
  • the UE 402 may monitor for PDCCH, e.g., with the C-RNTI. If the PDCCH is successfully decoded, the UE 402 may also decode PDSCH.
  • the UE 402 may send HARQ feedback 511 for any data carried in the fourth random access message 409. If two UEs sent a same preamble at 403, both UEs may receive the RAR 405 leading both UEs to send a third random access message 407.
  • the base station 404 may resolve such a collision by being able to decode the third random access message 407 from only one of the UEs and responding with a fourth random access message 409 to that UE.
  • the other UE which did not receive the fourth random access message 409, may determine that random access did not succeed and may re-attempt random access.
  • the fourth message 409 may be referred to as a contention resolution message.
  • the fourth random access message 409 may complete the random access procedure.
  • the UE 402 may then transmit uplink communication and/or receive downlink communication with the base station 404 based on the RAR 405.
  • the base station may send an RRC connection setup 413 using PDCCH and PDSCH.
  • the UE may respond with HARQ feedback 415 using PUCCH.
  • the base station 404 may send DCI 417 to the UE 402 using PDCCH.
  • the UE may respond with a message 419 that the RRC connection setup is complete.
  • a base station may use a full-duplex mode during resources designated for random access, e.g., PRACH resources.
  • Random access resources may correspond to time and/or frequency resources that the base station has indicated for reception of random access messages, e.g., a random access preamble, from UEs attempting to establish, re-establish, or resume an RRC connection with the base station.
  • the base station may reserve the random access resources for receiving random access messages and may limit other channels or traffic during the random access resources. The limitation of other channels or traffic avoids interference to the random access messages and helps to ensure that a UE is able to gain rain access. However, the reservation of random access resources can represent a large resource cost.
  • a base station may have full duplex capability in which the base station may transmit downlink communication and receive uplink communication using the same resources in time and/or frequency. While full-duplex operation of the base station during random access resources may enable the base station to use the resources for additional downlink communication, the full-duplex transmission of communication in an overlapping manner with reception of random access messages may cause an uplink random access message, such as a first random access message 403 in FIG. 4, to collide with the other downlink transmissions from the bae station.
  • FIG. 6 illustrates an example of self-interference by the base station. The self-interference would degrade the uplink PRACH reception. Additionally, other uplink signals or downlink signals from neighbor base stations may affect the base station’s ability to receive the PRACH.
  • the base station may have capability to monitor for PRACH in a more flexible manner using additional resources, because the PRACH reception does not limit the base station’s ability to transmit other communication, e.g., using a flexible slot structure.
  • the base station may continuously, monitor for uplink PRACH communication which enables random access without using a fixed resource pattern.
  • the added resources in time or frequency in which a UE can transmit a first random access message may reduce access latency for the UE.
  • the transmission power for random access may be determined based on an open loop power control algorithm.
  • the transmission power for the first random access message 403, e.g., P RACH ) may be determined based on:
  • P RACH min ⁇ P CMAX , PREAMBLE RECEIVED_TARGET_POWER + PL ⁇
  • the P CMAX is a maximum transmission power for the UE 402
  • PL is pathloss for communication between the UE 402 and the base station 404
  • PREAMBLE RECEIVED_TARGET_POWER is a level of power at which the base station can decode the preamble transmission from the UE.
  • the base station might not be able to decode the preamble transmission.
  • the UE 402 may measure a received downlink power P r for communication from the base station 404 and may use the downlink transmission power P t used by the base station 404 to transmit the communication to calculate a pathloss PL based on:
  • FIG. 6 illustrates an example diagram 600 of a base station 602 operating in a full-duplex mode to communicate with UE 604 and UE 606.
  • a portion of the downlink transmission 608 to the UE 604 overlaps with a portion of the uplink transmission 610 to the UE 606. Therefore, for a portion of the transmission/reception, the base station simultaneously performs a downlink transmission to the UE 604 and receives the uplink transmission from the UE 606.
  • the downlink transmission 608 may introduce self-interference for the base station’s reception of the uplink transmission 610.
  • the uplink transmission 610 from the UE 606 may cause interference to the reception of the downlink transmission 608 at the UE 604.
  • the first portion of the uplink transmission 610 may suffer from self-interference at the base station and may cause interference to the downlink reception at the UE 604.
  • the other portion of the uplink transmission includes a non-full duplex mode of the base station that does not involve the self-interference at the base station.
  • the full-duplex portion of the uplink transmission may involve more interference than the non-full-duplex portion.
  • the full duplex portion with self-interference may be at a low Signal to Interference and Noise Ratio (SINR) compared to the non-full duplex portion.
  • SINR Signal to Interference and Noise Ratio
  • FIG. 7 illustrates an example resource diagram 700 showing a first set of resources 710 including random access resources that are reserved for random access reception by the base station without other downlink or uplink traffic.
  • the random access resources in the first set of resources 710 are specific resources for PRACH reception. The remaining resources may be used for downlink transmissions or uplink reception by the base station.
  • the random access resources may be used by the base station for full-duplex mode communication, e.g., for downlink transmissions and/or uplink reception at the base station.
  • full duplex mode operation by the base station during reception of random access messages may cause self-interference that degrades uplink reception performance during the random access resources.
  • the random access resources in the first set of resources 710 may not be affected by such interference.
  • Random access resources may be based on a pattern.
  • the pattern may be a fixed pattern.
  • FIG. 8 illustrates an example fixed pattern 800 for random access resources.
  • a communication system experiences a light load, most of the random access resources in the fixed pattern will be blank, e.g., without transmissions of a first random access message 403 from a UE.
  • the resources could lead to resource waste, especially if the pattern includes a high density of random access resources.
  • the random access resources may roughly match a symbol boundary for the bae station in the given pattern. This may lead to additional latency, especially for frequent handover procedures.
  • a base station may configure fixed random access resources for half-duplex mode, such as illustrated in the first resource set 710 in FIG. 7.
  • the base station may apply a self-interference elimination method to remove self-interference when receiving random access messages.
  • the base station may apply an algorithm to remove self-interference from downlink traffic.
  • the base station may schedule less downlink traffic or predefined downlink traffic that overlap with the random access resources. For example, it may be easier for the base station to control self-interference for predefined downlink traffic or for light downlink traffic.
  • the base station may divide random access resources in a random access pattern into two sets of random access resources.
  • a first set of random access resources may be associated with half-duplex operation of the base station without other downlink or uplink transmissions.
  • the other set of random access resources may be capable of use with full-duplex mode operation by the base station.
  • the second set of random access resources may be capable of overlapping use by another channel.
  • FIG. 9 illustrates an example resource diagram 900 showing a first set of random access resources 904 that are reserved for a half-duplex mode at the base station and a second set of random access resources 902 during which the base station may operate in a full-duplex mode.
  • 80%of a RACH pattern may be configured as the second set of random access resources
  • 20%of the RACH pattern may be configured as the first set of random access resources that are limited to half-duplex mode for the base station.
  • the example percentage illustrated in FIG. 9 and the additional example of 80%and 20%are merely used to illustrate the concept of configuring two sets of resources. Any portion of the random access resources may be used for the first set of resources that is associated with a half-duplex mode of the base station.
  • the configuration of the two sets of random access resources may be static.
  • a fixed random access pattern including the two sets of random access resources may be predefined.
  • the base station and the UE may know the fixed pattern information.
  • the base station may configure the two sets of random access resources dynamically.
  • the base station may broadcast the dynamic configuration in system information.
  • the configuration of the two sets of random access resources may be indicated in the system information 401 in FIG. 4.
  • an index for the configuration may be carried in a SIB, such as SIB2 information.
  • the index may indicate to the UE which of the random access resources correspond to the first set and which correspond to the second set.
  • the configuration of the two sets of random access resources may be indicated to the UE in a dedicated transmission to the UE. For example, if the RACH is for a handover procedure, an index for the configuration may be included in DCI of a PDCCH.
  • FIG. 10 illustrates an example communication flow 1000 between a UE 1002 and a base station 1004 including the use of two sets of random access resources.
  • the base station 1004 may configure two the two sets of random access resources, at 1001.
  • the base station may divide random access resources according to a RACH pattern into a first set of random access resources associated with half-duplex mode at the base station and the second set of random access resources that may be associated with a full-duplex mode at the base station.
  • the UE 1002 may receive configuration information 1005 that indicates the first set of random access resources associated with half-duplex mode at the base station and the second set of random access resources that may be associated with a full-duplex mode at the base station.
  • the two resources sets may be based on a known pattern.
  • the UE 1002 selects between the first set of random access resources and the second set of random access resources.
  • the UE 1002 may attempt random access, e.g., transmit a first random access message 403 as in FIG. 4., using one of the sets of random access resources.
  • the UE 1002 may select one or both of the sets of random access resources based on a pathloss for communication between the UE 1002 and the base station 1004.
  • a pathloss for communication between the UE 1002 and the base station 1004.
  • the UE 1002 may select the first set of random access resources that are associated with the half-duplex mode of the base station.
  • the larger pathloss indicates that the UE 1002 is distant from the base station.
  • the received uplink signal power for a UE 1002 that is distant from the base station may be lower and may be susceptible to self-interference at the base station.
  • the UE 1002 may determine to use the set of resources that are associated with the half-duplex mode of the base station in order to avoid self-interference.
  • a UE 1002 that experiences a small pathloss e.g., less than the pathloss threshold, may use the second set of resources that may be associated with the full-duplex mode of the base station or may select resources from among both the first and second sets of resources.
  • the UE 1002 with the smaller pathloss is likely closer to the base station 1004.
  • the received uplink power from the closer UE will be stronger.
  • the UE 1002 or the base station 1004 is more likely to be able to mitigate potential self-interference for the UE experiencing the lower pathloss. Therefore, the closer UE may select from among either of the two sets of resources.
  • the second set of resources that may be associated with the full-duplex mode of the base station 1004 may be denser than the first set of random access resources.
  • a UE 1002 that experiences a lower pathloss may determine to use the second set of resources that may be associated with a full-duplex mode of the base station. By limiting UE’s with a low pathloss to the second set of resources may help to ensure that UE’s that are more distant from the base station are not blocked from using the first set of random access resources that are associated with the half-duplex mode of the base station.
  • the selection, at 1007, may be based on a distance of the UE 1002 from the base station 1004.
  • a UE 1002 that is farther than a threshold distance from the base station 1004 may determine to use the set of resources that are associated with the half-duplex mode of the base station 1004.
  • a UE 1002 that is within the threshold distance of the base station 1004 may determine to use the second set of resources that may be associated with the full-duplex mode of the base station or may select resources from among both the first and second sets of resources.
  • the base station 1004 may configure the UE 1002 to use a particular set of the random access resources.
  • the configuration may be indicated, e.g., in the configuration information 1005.
  • a source base station may indicate to the UE 1002 in DCI to use the second set of random access resources that may be associated with the full-duplex operation of the base station to send a preamble to the target base station.
  • the source base station may indicate the second set of random access resources because the resources may be denser than the first set of random access resources that are associated with half-duplex mode of the base station. Therefore, an opportunity may occur more quickly for the UE 1002 to be able to send the preamble to the target base station. This may reduce the amount of latency for the UE 1002 to handover to the target base station.
  • the indication to use a particular set of the random access resources may be sent in system information.
  • the UE 1002 may determine a transmit power for the first random access message (e.g., first random access message 403 in FIG. 4) based on the set of random access resources that is selected by the UE, at 1007. For example, the UE 1002 may use different transmit power in PRACH occasions from the first set of random access resources that are associated with a half-duplex mode of the base station than in PRACH occasions from the second set of random access resources that may be associated with a full-duplex of the base station.
  • the different transmit powers may be based on one or more of a different initial transmit power or a different power ramping step.
  • FIG. 11 illustrates a diagram 1100 showing a different initial transmit power for the two sets of random access resources.
  • a higher initial transmit power is used for RACH occasions from the second set of random access resources that may be associated with a full-duplex mode of the base station.
  • the UE may use a lower initial transmit power for RACH occasions from the first set of random access resources that are associated with a half-duplex mode of the base station.
  • the UE 1002 may use a larger power ramping step for RACH occasions from the second set of random access resources that may be associated with a full-duplex mode of the base station than for RACH occasions from the first set of random access resources that are associated with a half-duplex mode of the base station.
  • the first transmission of the preamble 1011 may use the same initial transmit power, or may use the higher transmit power illustrated in FIG. 11. Then, if the first transmission fails, the UE 1002 may transmit the preamble a second time, e.g., at 1017 with a transmit power that is increased according to a power ramping step, at 1015 that is specific to the set of random access resources.
  • the UE 1002 may apply a ramping power associated with full-duplex operation of the base station, e.g., Ramping FD based on:
  • the base station 1004 may employ power control, at 1013, based on whether a RACH occasions is associated with a half-duplex mode of the base station than in PRACH occasions associated with a full-duplex of the base station.
  • the base station 1004 may employ power control during RACH occasions based on the type of mode used by the base station, e.g., either half-duplex mode or full-duplex mode.
  • FIG. 12 illustrates an example different in downlink transmit power during RACH occasions, in which the base station operates in a full-duplex mode both transmitting downlink communication and monitoring for uplink random access messages, and for downlink transmissions outside of RACH occasions.
  • the base station 1004 may decrease the downlink transmit power during the RACH occasions, as illustrated. In the full-duplex mode RACH occasions, the base station 1004 may continue to transmit using a lower transmit power.
  • the UE 1002 may determine to use random access resources from the other set of random access resources. For example, the UE may select one or both of the sets of random access resources based on a capability of the UE, at 1007. If random access fails a threshold number of times, which may be one or more times, the UE may switch to selection from a different set of random access resources, at 1019. The UE may dynamically switch between the two sets of random access resources. For example, the UE may initially select the half-duplex random access resource set. Then, after a number of attempts, such as preamble 1011 and preamble 1017, etc., the UE may switch to using the full-duplex random access resources for an additional preamble transmission 1021.
  • the full-duplex random access resources may have a higher density than the half-duplex random access resources. Therefore, the switch to the full-duplex random access resources may provide the UE with additional resources for random access.
  • the UE’s inability to successfully perform random access may indicate that a large number of UEs are using the half-duplex random access resources to perform random access. Therefore, switching to the full-duplex random access resources may help the UE 1002 to avoid transmissions from the other UEs.
  • the UE 1002 may initially select the full-duplex random access resources, and after a number of attempts, may switch to the half-duplex random access resources.
  • the base station 1004 may not experience self-interference during the half-duplex random access resources. Therefore, the UE 1002 may be more likely to successfully perform random access when using the half-duplex random access resources.
  • the switch may be based on a UE selection rather than a base station configuration.
  • the UE 1002 may report its capability 1003 to support both of the patterns to the base station 1004.
  • the base station 1004 may respond by indicating both patterns or random access resources to the UE, e.g., in the configuration information 1005.
  • the UE 1002 may then select, at 1007, a set of random access resources.
  • additional random access messages such as msg 3 1023, may be transmitted using non-full-duplex resources.
  • the base station 1004 may configure two different power offsets for the situation when the preamble 1011 and msg 3 1023 are not transmitted using the same type of resources.
  • the power offsets may be indicated using a delta, such as the L1 parameter msg3-DeltaPreamble parameter that may be provided to the UE, e.g., in the configuration information 1005.
  • the power offset between msg 3 1023 and the RACH preamble transmission may be provided in steps of 1dB.
  • FIG. 13 is a flowchart 1300 of a method of wireless communication.
  • the method may be performed by a base station or a component of a base station (e.g., the base station 102, 180, 310, 404, 1004; the apparatus 1402/1402'; the processing system 1514, which may include the memory 376 and which may be the entire base station 310 or a component of the base station 310, such as the TX processor 316, the RX processor 370, and/or the controller/processor 375) .
  • Optional aspects may be illustrated with a dashed line.
  • the method may enable a base station to make an efficient use of wireless resources while also providing random access resources that avoid self-interference.
  • the base station configures a first set of random access resources and a second set of random access resources.
  • the first set of random access resources are reserved for a half-duplex mode.
  • the random access resources may comprise time and/or frequency resources.
  • the configuration may be performed, e.g., by the resource component 1408 of the apparatus 1402 in FIG. 14.
  • the second set of random access resources are at least for a full duplex mode, and the base station may operate using the full-duplex mode during at least a portion of the second set of random access resources.
  • the base station may configure the two random access resources sets as described in connection with 1001 in FIG. 10.
  • the base station may configure the first set of random access resources and the second set of random access resources based on a known pattern.
  • the base station may dynamically configure the first set of random access resources and the second set of random access resources.
  • the base station may provide the configuration to a UE.
  • the base station may broadcast configuration information for the first set of random access resources and the second set of random access resources in system information.
  • the base station may transmit the second set of random access resources in system information in dedicated signaling to a UE.
  • the dedicated signaling may include at least one of downlink control information (DCI) bits in a physical downlink control channel (PDCCH) , a medium access control-control element (MAC-CE) , or a radio resource control (RRC) message.
  • DCI downlink control information
  • PDCCH physical downlink control channel
  • MAC-CE medium access control-control element
  • RRC radio resource control
  • the broadcast transmission and/or the transmission in dedicated signaling may be performed, e.g., by the transmission component 1406 of the apparatus 1402 in FIG. 14.
  • the base station operates using the half-duplex mode during the first set of random access resources.
  • the half-duplex operation may be performed, e.g., by the mode component 1410 of the apparatus 1402 in FIG. 14.
  • the base station may monitor for random access messages during the random access resources without overlapping downlink or uplink communication.
  • the base station may operate in a full-duplex mode or a half-duplex mode.
  • the base station may use a reduced transmit power for downlink transmissions in a full-duplex mode during the second set of random access resources.
  • the reduction in transmit power may be performed, e.g., by the transmit power component 1412 of the apparatus 1402 in FIG. 14.
  • the transmit power may be reduced, e.g., as described in connection with FIG. 12.
  • the base station may configure a power offset difference between a random access preamble transmission and a third random access message transmission.
  • the configuration may be performed, e.g., by the power offset component 1414 of the apparatus 1402 in FIG. 14.
  • the base station may receive a random access preamble transmission from a UE using the second set of random access resources, and, at 1316, the base station receives a third random access message transmission from the UE using the first set of random access resources.
  • the reception may be performed, e.g., by the reception component 1404 of the apparatus 1402 in FIG. 14.
  • the third random access message transmission may use the power offset difference configured at 1304.
  • FIG. 14 is a conceptual data flow diagram 1400 illustrating the data flow between different means/components in an example apparatus 1402.
  • the apparatus may be a base station or a component of a base station.
  • the apparatus 1402 includes a reception component 1404 configured to receive uplink communication from the UE 1450 and a transmission component 1406 configured to transmit downlink communication to the UE 1450.
  • the apparatus 1402 includes a resource component 1408 configured to configure a first set of random access resources and a second set of random access resources, e.g., as described in connection with 1302 in FIG. 13.
  • the first set of random access resources are reserved for a half-duplex mode.
  • the transmission component 1406 may be configured to broadcast configuration information for the first set of random access resources and the second set of random access resources in system information or to transmit the second set of random access resources in system information in dedicated signaling to a UE, e.g., as described in connection with 1306 or 1308 in FIG. 13.
  • the apparatus 1402 may include a mode component 1410 configured to operate using the half-duplex mode during the first set of random access resources, e.g., as described in connection with 1310 in FIG. 10.
  • the mode component 1410 may be configured to operate in a full-duplex mode.
  • the apparatus 1402 may include a transmit power component 1412 configured to use a reduced transmit power for downlink transmissions in a full-duplex mode during the second set of random access resources, e.g., as described in connection with 1312 in FIG. 13.
  • the apparatus 1402 may include a power offset component 1414 configured to configure a power offset difference between a random access preamble transmission and a third random access message transmission, e.g., as described in connection with 1304 in FIG. 13.
  • the apparatus may include additional components that perform each of the blocks of the algorithm in the aforementioned flowchart of FIG. 13, and aspects performed by the base station in FIG. 10. As such, each block in the aforementioned flowchart of FIG. 13 and aspects performed by the base station in FIG. 10 may be performed by a component and the apparatus may include one or more of those components.
  • the components may be one or more hardware components specifically configured to carry out the stated processes/algorithm, implemented by a processor configured to perform the stated processes/algorithm, stored within a computer-readable medium for implementation by a processor, or some combination thereof.
  • FIG. 15 is a diagram 1500 illustrating an example of a hardware implementation for an apparatus 1402' employing a processing system 1514.
  • the processing system 1514 may be implemented with a bus architecture, represented generally by the bus 1524.
  • the bus 1524 may include any number of interconnecting buses and bridges depending on the specific application of the processing system 1514 and the overall design constraints.
  • the bus 1524 links together various circuits including one or more processors and/or hardware components, represented by the processor 1504, the components 1404, 1406, 1408 1410, 1412, 1414, and the computer-readable medium /memory 1506.
  • the bus 1524 may also link various other circuits such as timing sources, peripherals, voltage regulators, and power management circuits, which are well known in the art, and therefore, will not be described any further.
  • the processing system 1514 may be coupled to a transceiver 1510.
  • the transceiver 1510 is coupled to one or more antennas 1520.
  • the transceiver 1510 provides a means for communicating with various other apparatus over a transmission medium.
  • the transceiver 1510 receives a signal from the one or more antennas 1520, extracts information from the received signal, and provides the extracted information to the processing system 1514, specifically the reception component 1404.
  • the transceiver 1510 receives information from the processing system 1514, specifically the transmission component 1406, and based on the received information, generates a signal to be applied to the one or more antennas 1520.
  • the processing system 1514 includes a processor 1504 coupled to a computer-readable medium /memory 1506.
  • the processor 1504 is responsible for general processing, including the execution of software stored on the computer-readable medium /memory 1506.
  • the software when executed by the processor 1504, causes the processing system 1514 to perform the various functions described supra for any particular apparatus.
  • the computer-readable medium /memory 1506 may also be used for storing data that is manipulated by the processor 1504 when executing software.
  • the processing system 1514 further includes at least one of the components 1404, 1406, 1408 1410, 1412, 1414.
  • the components may be software components running in the processor 1504, resident/stored in the computer readable medium /memory 1506, one or more hardware components coupled to the processor 1504, or some combination thereof.
  • the processing system 1514 may be a component of the base station 310 and may include the memory 376 and/or at least one of the TX processor 316, the RX processor 370, and the controller/processor 375. Alternatively, the processing system 1514 may be the entire base station (e.g., see 310 of FIG. 3) .
  • the apparatus 1402/1402' for wireless communication includes means for configuring a first set of random access resources and a second set of random access resources, wherein the first set of random access resources are reserved for a half-duplex mode.
  • the apparatus 1402/1402’ may include means for operating using the half-duplex mode during the first set of random access resources.
  • the apparatus 1402/1402’ may include means for broadcasting configuration information for the first set of random access resources and the second set of random access resources in system information.
  • the apparatus 1402/1402’ may include means for transmitting configuration information for the first set of random access resources and the second set of random access resources in system information in dedicated signaling to a UE.
  • the apparatus 1402/1402’ may include means for using a reduced transmit power for downlink transmissions in a full-duplex mode during the second set of random access resources.
  • the apparatus 1402/1402’ may include means for configuring a power offset difference between a random access preamble transmission using the first set of random access resources and a third random access message transmission using the second set of random access resources.
  • the aforementioned means may be one or more of the aforementioned components of the apparatus 1402 and/or the processing system 1514 of the apparatus 1402' configured to perform the functions recited by the aforementioned means.
  • the processing system 1514 may include the TX Processor 316, the RX Processor 370, and the controller/processor 375.
  • the aforementioned means may be the TX Processor 316, the RX Processor 370, and the controller/processor 375 configured to perform the functions recited by the aforementioned means.
  • FIG. 16 is a flowchart 1600 of a method of wireless communication.
  • the method may be performed by a UE or a component of a UE (e.g., the UE 104, 350, 402, 1002; the apparatus 1702/1702'; the processing system 1814, which may include the memory 360 and which may be the entire UE 350 or a component of the UE 350, such as the TX processor 368, the RX processor 356, and/or the controller/processor 359) .
  • Optional aspects are illustrated with a dashed line. The method enables a more efficient use of random access resources.
  • the UE selects a resource from a first set of random access resources and a second set of random access resources, where the first set of random access resources are reserved for a half-duplex mode.
  • the random access resource may comprise a time and/or frequency resource.
  • the second set of random access resources may be at least for a full duplex mode (e.g., with the base station operating using the full-duplex mode during at least a portion of the second set of random access resources) .
  • the selection may be performed by the selection component 1708 of the apparatus 1702 in FIG. 17. Example aspects regarding the UE’s selection are described connection with FIG. 10.
  • the UE may select the resource based on at least one of a UE capability, a pathloss for communication between the UE and the base station, a delay requirement for the UE, or a distance from the base station. For example, the UE may select the resource from the first set of random access resources when the pathloss is above a pathloss threshold. As another example, the UE may select the resource from the second set of random access resources when the delay requirement for the UE is below a delay threshold. As another example, the UE may select the resource from the first set of random access resources when the distance from the base station exceeds a distance threshold.
  • the UE may receive a configuration from the base station to use the first set of random access resources or the second set of random access resources, and the UE may select the resource, at 1608, based on the configuration.
  • the reception may be performed, e.g., by the reception component 1704 of the apparatus 1702 in FIG. 17.
  • the configuration may be received in a broadcast from the base station.
  • the configuration may be received in a dedicated transmission for the UE.
  • the first set of random access resources and the second set of random access resources may be based on a known pattern.
  • the UE may receive, at 1602, a configuration for the first set of random access resources and the second set of random access resources from the base station.
  • the configuration may be received, e.g., by the reception component 1704 of the apparatus 1702 in FIG. 17.
  • the configuration for the first set of random access resources and the second set of random access resources may be received in system information from the base station.
  • the configuration for the first set of random access resources and the second set of random access resources may be received in dedicated signaling to the UE.
  • the dedicated signaling may include at least one of DCI bits in a PDCCH, a MAC-CE, or an RRC message.
  • the UE transmits a random access message to a base station using the selected resource.
  • the transmission may be performed, e.g., by a random access component 1710 of the apparatus 1702 in FIG. 17.
  • the UE may transmit the random access message using at least one of a transmit power or a power ramping step to transmit the random access message based on whether the resource is selected from the first set of random access resources or the second set of random access resources. For example, the UE may use a larger transmit power to transmit the random access message when the resource is selected from the second set of random access resources than when the resource is selected from the first set of random access resources.
  • the UE may use a larger power ramping step to transmit the random access message when the resource is selected from the second set of random access resources than when the resource is selected from the first set of random access resources.
  • the UE may select the resource from the first set of random access resources for at least one random access message, and the UE may select a second resource from the second set of random access resources when the at least one random access message is not successful.
  • the UE may select the resource from the second set of random access resources for at least one random access message, and the UE may select a second resource from the first set of random access resources when the at least one random access message is not successful.
  • the random access message transmitted at 1610 may include a first random access message comprising a preamble, such as message 403 in FIG. 4.
  • the UE may receive a second random access message from the base station in response to the first random access message.
  • the reception may be performed, e.g., by the reception component 1704 and/or the random access component 1710 of the apparatus 1702 in FIG. 17.
  • the second random access message may comprise a RAR, such as the message 405 in FIG. 4, for example.
  • the UE may transmit a third random access message to the base station, where the first random access message is transmitted using the resource from the second set of random access resources, and the third random access message is transmitted using an additional resource selected from the first set of random access resources.
  • the third random access message may be transmitted, e.g., by the random access component 1710 and/or the transmission component 1706 of the apparatus 1702 in FIG. 17.
  • the third random access message may correspond to the message 407 in FIG. 4, for example.
  • the UE may receive, from the base station, a power offset difference between the first random access transmission (e.g., a preamble transmission) and the third random access message transmission.
  • the reception of the power offset may be performed by the power offset component 1712 of the apparatus 1702 in FIG. 17.
  • the UE may transmit the third random access message, at 1612, using the power offset difference.
  • FIG. 17 is a conceptual data flow diagram 1700 illustrating the data flow between different means/components in an example apparatus 1702.
  • the apparatus may be a UE or a component of a UE.
  • the apparatus 1702 includes a reception component 1704 configured to receive downlink communication from the base station 1750 and a transmission component 1706 configured to transmit uplink transmissions to the base station 1750.
  • the apparatus 1702 may include a the selection component 1708 configured to select a resource from a first set of random access resources and a second set of random access resources, where the first set of random access resources are reserved for a half-duplex mode, e.g., as described in connection with 1608 in FIG. 16.
  • the reception component 1704 may be configured to receive a configuration from the base station to use the first set of random access resources or the second set of random access resources, e.g., as described in connection with 1606 in FIG. 16.
  • the reception component 1704 may be configured to receive a configuration for the first set of random access resources and the second set of random access resources from the base station, e.g., as described in connection with 1602 in FIG. 16.
  • the apparatus 1702 may include a random access component 1710 configured to transmit a random access message to a base station using the selected resource. The transmission may be performed, e.g., as described in connection with 1610 in FIG. 16.
  • the random access component 1710 may be configured to receive a second random access message from the base station in response to the first random access message, e.g., as described in connection with 1612 in FIG. 16.
  • the random access component 1710 may be configured to transmit a third random access message to the base station, where the first random access message is transmitted using the resource from one of the first set of random access resources or the second set of random access resources, and the third random access message is transmitted using an additional resource selected from the other of the first set of random access resources or the second set of random access resources, e.g., as described in connection with 1614 in FIG. 16.
  • the apparatus 1702 may include a power offset component 1712 configured to receive, from the base station, a power offset difference between a random access preamble transmission and a third random access message transmission, e.g., as described in connection with 1604 in FIG. 16.
  • the apparatus may include additional components that perform each of the blocks of the algorithm in the aforementioned flowchart of FIGs. 16 and the aspects of FIG. 10 performed by the UE.
  • each block in the aforementioned flowchart of FIGs. 16 and the aspects of FIG. 10 performed by the UE may be performed by a component and the apparatus may include one or more of those components.
  • the components may be one or more hardware components specifically configured to carry out the stated processes/algorithm, implemented by a processor configured to perform the stated processes/algorithm, stored within a computer-readable medium for implementation by a processor, or some combination thereof.
  • FIG. 18 is a diagram 1800 illustrating an example of a hardware implementation for an apparatus 1702' employing a processing system 1814.
  • the processing system 1814 may be implemented with a bus architecture, represented generally by the bus 1824.
  • the bus 1824 may include any number of interconnecting buses and bridges depending on the specific application of the processing system 1814 and the overall design constraints.
  • the bus 1824 links together various circuits including one or more processors and/or hardware components, represented by the processor 1804, the components 1704, 1706, 1708, 1710, 1712, and the computer-readable medium /memory 1806.
  • the bus 1824 may also link various other circuits such as timing sources, peripherals, voltage regulators, and power management circuits, which are well known in the art, and therefore, will not be described any further.
  • the processing system 1814 may be coupled to a transceiver 1810.
  • the transceiver 1810 is coupled to one or more antennas 1820.
  • the transceiver 1810 provides a means for communicating with various other apparatus over a transmission medium.
  • the transceiver 1810 receives a signal from the one or more antennas 1820, extracts information from the received signal, and provides the extracted information to the processing system 1814, specifically the reception component 1704.
  • the transceiver 1810 receives information from the processing system 1814, specifically the transmission component 1706, and based on the received information, generates a signal to be applied to the one or more antennas 1820.
  • the processing system 1814 includes a processor 1804 coupled to a computer-readable medium /memory 1806.
  • the processor 1804 is responsible for general processing, including the execution of software stored on the computer-readable medium /memory 1806.
  • the software when executed by the processor 1804, causes the processing system 1814 to perform the various functions described supra for any particular apparatus.
  • the computer-readable medium /memory 1806 may also be used for storing data that is manipulated by the processor 1804 when executing software.
  • the processing system 1814 further includes at least one of the components 1704, 1706, 1708, 1710, 1712.
  • the components may be software components running in the processor 1804, resident/stored in the computer readable medium /memory 1806, one or more hardware components coupled to the processor 1804, or some combination thereof.
  • the processing system 1814 may be a component of the UE 350 and may include the memory 360 and/or at least one of the TX processor 368, the RX processor 356, and the controller/processor 359. Alternatively, the processing system 1814 may be the entire UE (e.g., see 350 of FIG. 3) .
  • the apparatus 1702/1702' for wireless communication includes means for selecting a resource from a first set of random access resources and a second set of random access resources, wherein the first set of random access resources are reserved for a half-duplex mode.
  • the apparatus 1702/1702’ may include means for transmitting a random access message to a base station using the selected resource.
  • the apparatus 1702/1702’ may include means for receiving a configuration for the first set of random access resources and the second set of random access resources from the base station.
  • the apparatus 1702/1702’ may include means for receiving a configuration from the base station to use the first set of random access resources or the second set of random access resources, wherein the UE selects the resource based on the configuration.
  • the apparatus 1702/1702’ may include means for receiving a second random access message from the base station in response to the first random access message.
  • the apparatus 1702/1702’ may include means for transmitting a third random access message to the base station, wherein the first random access message is transmitting using the resource from one of the first set of random access resources or the second set of random access resources, and the third random access message is transmitted using an additional resource selected from the other of the first set of random access resources or the second set of random access resources.
  • the apparatus 1702/1702’ may include means for receiving, from the base station, a power offset difference between a random access preamble transmission using the first set of random access resources and a third random access message transmission using the second set of random access resources, wherein the third random access message is transmitted using the power offset difference.
  • the aforementioned means may be one or more of the aforementioned components of the apparatus 1702 and/or the processing system 1814 of the apparatus 1702' configured to perform the functions recited by the aforementioned means.
  • the processing system 1814 may include the TX Processor 368, the RX Processor 356, and the controller/processor 359.
  • the aforementioned means may be the TX Processor 368, the RX Processor 356, and the controller/processor 359 configured to perform the functions recited by the aforementioned means.
  • Combinations such as “at least one of A, B, or C, ” “one or more of A, B, or C, ” “at least one of A, B, and C, ” “one or more of A, B, and C, ” and “A, B, C, or any combination thereof” include any combination of A, B, and/or C, and may include multiples of A, multiples of B, or multiples of C.
  • combinations such as “at least one of A, B, or C, ” “one or more of A, B, or C, ” “at least one of A, B, and C, ” “one or more of A, B, and C, ” and “A, B, C, or any combination thereof” may be A only, B only, C only, A and B, A and C, B and C, or A and B and C, where any such combinations may contain one or more member or members of A, B, or C.

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  • Computer Networks & Wireless Communication (AREA)
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Abstract

Des ressources d'accès aléatoire sont configurées dans un premier ensemble de ressources d'accès aléatoire et un second ensemble de ressources d'accès aléatoire, le premier ensemble de ressources d'accès aléatoire étant réservé pour un mode semi-duplex. La station de base fonctionne à l'aide du mode semi-duplex pendant le premier ensemble de ressources d'accès aléatoire. Un équipement utilisateur (UE) sélectionne une ressource parmi un premier ensemble de ressources d'accès aléatoire et un second ensemble de ressources d'accès aléatoire et transmet un message d'accès aléatoire à l'aide de la ressource sélectionnée.
PCT/CN2019/118297 2019-11-14 2019-11-14 Accès aléatoire basé sur des ressources d'accès aléatoire en semi-duplex et des ressources d'accès aléatoire en duplex intégral WO2021092820A1 (fr)

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WO2022221984A1 (fr) * 2021-04-19 2022-10-27 Qualcomm Incorporated Configuration d'accès aléatoire et procédure en fonctionnement en duplex intégral
WO2023133006A1 (fr) * 2022-01-07 2023-07-13 Qualcomm Incorporated Occasions de canal d'accès aléatoire et ressources pour atténuation d'interférence

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WO2023133006A1 (fr) * 2022-01-07 2023-07-13 Qualcomm Incorporated Occasions de canal d'accès aléatoire et ressources pour atténuation d'interférence

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