WO2021147074A1 - Miroirs de partie de bande passante (bwp) pour équipements utilisateurs à faible complexité nde passante limitée - Google Patents

Miroirs de partie de bande passante (bwp) pour équipements utilisateurs à faible complexité nde passante limitée Download PDF

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Publication number
WO2021147074A1
WO2021147074A1 PCT/CN2020/073977 CN2020073977W WO2021147074A1 WO 2021147074 A1 WO2021147074 A1 WO 2021147074A1 CN 2020073977 W CN2020073977 W CN 2020073977W WO 2021147074 A1 WO2021147074 A1 WO 2021147074A1
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WO
WIPO (PCT)
Prior art keywords
bwp
active bwp
resource block
size
mirror
Prior art date
Application number
PCT/CN2020/073977
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English (en)
Inventor
Qiaoyu Li
Chao Wei
Jing Dai
Peter Pui Lok Ang
Jing LEI
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Qualcomm Incorporated
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Publication date
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Priority to PCT/CN2020/073977 priority Critical patent/WO2021147074A1/fr
Publication of WO2021147074A1 publication Critical patent/WO2021147074A1/fr

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    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04W—WIRELESS COMMUNICATION NETWORKS
    • H04W72/00—Local resource management
    • H04W72/04—Wireless resource allocation
    • H04W72/044—Wireless resource allocation based on the type of the allocated resource
    • H04W72/0453—Resources in frequency domain, e.g. a carrier in FDMA
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
    • H04L5/00—Arrangements affording multiple use of the transmission path
    • H04L5/0091—Signaling for the administration of the divided path
    • H04L5/0092—Indication of how the channel is divided
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
    • H04L5/00—Arrangements affording multiple use of the transmission path
    • H04L5/0001—Arrangements for dividing the transmission path
    • H04L5/0003—Two-dimensional division
    • H04L5/0005—Time-frequency
    • H04L5/0007—Time-frequency the frequencies being orthogonal, e.g. OFDM(A), DMT
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
    • H04L5/00—Arrangements affording multiple use of the transmission path
    • H04L5/003—Arrangements for allocating sub-channels of the transmission path
    • H04L5/0037—Inter-user or inter-terminal allocation
    • H04L5/0041—Frequency-non-contiguous
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
    • H04L5/00—Arrangements affording multiple use of the transmission path
    • H04L5/0091—Signaling for the administration of the divided path
    • H04L5/0096—Indication of changes in allocation
    • H04L5/0098—Signalling of the activation or deactivation of component carriers, subcarriers or frequency bands

Definitions

  • the present disclosure relates generally to communication systems, and more particularly, to bandwidth part (BWP) mirrors for bandwidth-limited low complexity user equipments (UEs) .
  • BWP bandwidth part
  • 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
  • a method, an apparatus, and a computer-readable medium are provided for wireless communication at a user equipment (UE) .
  • the apparatus receives first configuration information from a network including a bandwidth part (BWP) of a radio frequency (RF) carrier and a set of mirror BWPs associated with the BWP, each of the set of mirror BWPs including a frequency domain (FD) offset relative to the BWP, set the BWP as the active BWP of the UE, receives second configuration information from the network indicating a mirror BWP in the set of mirror BWPs, and reconfigures the active BWP to include frequency domain resources of the mirror BWP.
  • BWP bandwidth part
  • RF radio frequency
  • FD frequency domain
  • a method, an apparatus, and a computer-readable medium are provided for wireless communication at a user equipment (UE) .
  • the apparatus receives first configuration information from a network including a BWP of a radio frequency (RF) carrier, sets the BWP as the active BWP of the UE, receives second configuration information from the network indicating at least one frequency domain (FD) offset relative to the BWP, and reconfigures the active BWP based on the FD offset.
  • RF radio frequency
  • 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 shows an example physical resource block (PRB) grid within a carrier bandwidth of a 5G NR network in accordance with various aspects of the disclosure.
  • PRB physical resource block
  • FIG. 5 is a signal flow diagram in accordance with the various aspects of the disclosure.
  • FIG. 6 is a signal flow diagram in accordance with the various aspects of the disclosure.
  • FIG. 7 is a flowchart of a method of wireless communication.
  • FIG. 8 is a conceptual data flow diagram illustrating the data flow between different means/components in an example apparatus.
  • FIG. 9 is a diagram illustrating an example of a hardware implementation for an apparatus employing a processing system.
  • FIG. 10 is a diagram illustrating an example of a hardware implementation for an apparatus employing a processing system.
  • 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 backhaul links 132 (e.g., S1 interface) .
  • the base stations 102 configured for 5G NR may interface with core network 190 through backhaul links 184.
  • NG-RAN Next Generation RAN
  • 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 backhaul links 134 (e.g., X2 interface) .
  • the 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 an eNB, gNodeB (gNB) , or another type of base station.
  • Some base stations, such as gNB 180 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 millimeter wave
  • mmW base station Extremely high frequency (EHF) is part of the RF in the electromagnetic spectrum. 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 180 may utilize beamforming 182 with the UE 104 to compensate for the extremely high path loss and short range.
  • 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 also be referred to as a gNB, Node B, evolved 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.
  • the UE 104 may be configured to reconfigure an active BWP based on a mirror BWP or a frequency domain (FD) offset (198) .
  • FD frequency domain
  • 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 implement a frequency division duplex (FDD) scheme 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 implement a time division duplex (TDD) scheme in which for a particular set of subcarriers (carrier system bandwidth) , subframes within the set of subcarriers are dedicated for both DL and UL.
  • FDD frequency division duplex
  • TDD time division duplex
  • the 5G/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) . While subframes 3, 4 are shown with slot formats 34, 28, respectively, any particular subframe may be configured with any of the various available slot formats 0-61. Slot formats 0, 1 are all DL, UL, respectively. Other slot formats 2-61 include a mix of DL, UL, and flexible symbols.
  • UEs are configured with the slot format (dynamically through DL control information (DCI) , or semi-statically/statically through radio resource control (RRC) signaling) through a received slot format indicator (SFI) .
  • DCI DL control information
  • RRC radio resource control
  • SFI received slot format indicator
  • a frame (10 ms) may be divided into 10 equally sized subframes (1 ms) .
  • Each subframe may include one or more time slots.
  • Subframes may also include mini-slots, which may include 7, 4, or 2 symbols.
  • 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 kKz, 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.
  • 5G NR networks may implement a set of features (also referred to as NR-Light) that supports reduced complexity UEs.
  • reduced complexity UEs may include wearable devices, industrial sensors, video surveillance devices (e.g., stationary cameras) , and/or other suitable devices.
  • reduced complexity UEs may have a lower wireless transmission power, fewer antennas (e.g., antennas for transmitting and/or receiving) , a reduced bandwidth for wireless transmission and/or reception, reduced computational complexity/memory, and/or longer battery life.
  • a reduced complexity UE may have a bandwidth in the range of 5.0 MHz to 20 MHz, while a standard UE may have a bandwidth of 100 MHz.
  • One example goal of the present disclosure is to enhance co-existence among 5G NR reduced complexity UEs and 5G NR standard UEs.
  • 5G NR networks may support very large operating bandwidths relative to previous generations of cellular networks (e.g., LTE) .
  • LTE Long Term Evolution
  • requiring a UE to operate across the entire bandwidth of a 5G NR network may introduce unnecessary complexities to the operation of the UE and may significantly increase a UE’s power consumption. Therefore, to avoid the need for the operating bandwidth of a UE to match the full bandwidth (also referred to as a carrier bandwidth or a component carrier bandwidth) of a cell in a 5G NR network, 5G NR introduces the concept of a bandwidth part (BWP) .
  • BWP bandwidth part
  • a BWP (e.g., a configured frequency band) may allow a UE to operate with a narrower bandwidth (e.g., for wireless transmission and/or reception) than the full bandwidth of a cell.
  • BWPs may allow UEs with different bandwidth capabilities to operate in a cell with smaller instantaneous bandwidths relative to the full bandwidth configured for the cell.
  • a UE may not be required to transmit and or receive outside of the BWP assigned to the UE (also referred to as an active BWP of the UE) .
  • a serving cell may configure a maximum of four DL BWPs and four UL BWPs.
  • a serving cell may configure a maximum of four DL/UL BWP pairs.
  • a serving cell may configure a maximum of 4 UL BWPs.
  • a serving cell may support separate sets of BWP configurations for DL and UL per component carrier (CC) .
  • DL and UL BWPs may be configured separately and independently for each UE-specific serving cell.
  • the numerology of a DL BWP configuration may apply to PDCCH and PDSCH.
  • the numerology of a UL BWP configuration may apply to PUCCH and PUSCH.
  • a serving cell may support a joint set of BWP configurations for DL and UL per CC.
  • DL and UL BWPs may be jointly configured as a pair, with the restriction that the DL/UL BWP pair shares the same center frequency but may be of different bandwidths for each UE-specific serving cell for a UE.
  • the numerology of the DL/UL BWP configuration may apply to PDCCH, PDSCH, PUCCH, and PUSCH.
  • the UE is not expected to retune the center frequency of the channel bandwidth between DL and UL. Supporting the ability to switch a BWP among multiple BWPs is memory consuming, since each BWP requires a whole set of RRC configurations.
  • a BWP When a BWP is allocated to a UE (e.g., an active BWP) , the UE tunes its antenna for the BWP and is expected to perform cannel state information (CSI) measurements only within its active DL BWP.
  • a UE may be RRC configured with a single active BWP.
  • the UE may not be expected to receive any physical channels or signals (e.g., PDSCH, PDCCH, or a CSI-RS) outside its active BWP.
  • a periodic or semi-persistent CSI report associated with a DL BWP may be scheduled for reporting at a certain time (e.g., during a slot n) .
  • a single set of CSI triggering states may be RRC configured.
  • the CSI triggering states may be associated with either candidate DL BWP.
  • a UE may not be expected to be triggered with a CSI report for a non-active DL BWP.
  • When a UE performs a measurement or transmits an SRS outside of its active BWP it is considered a measurement gap. During the measurement gap, the UE is not expected to monitor a control resource set (CORESET) .
  • CORESET control resource set
  • a reduced complexity UE may only support a single BWP, due to the limited computational memory of the reduced complexity UE. Moreover, the reduced complexity UE may not support BWP switching (e.g., BWP switching based on a semi-persistent scheduling (SPS) scheme or dynamic BWP switching) since these features generally involve a significant amount of computational complexity.
  • BWP switching e.g., BWP switching based on a semi-persistent scheduling (SPS) scheme or dynamic BWP switching
  • a base station e.g., gNB
  • the base station may need to first reconfigure the current active BWP of the reduced complexity UE.
  • RRC reconfiguration of the current BWP may delay transmission of an accurate CSI report, which may further limit PDSCH performance in the new frequency domain (FD) resource.
  • the aspects described herein may reduce the delay caused by the previously described scenarios.
  • low complexity and low memory-consuming schemes may enable a temporary BWP switching (also referred to as a virtual BWP switch) based on mirror bandwidth parts (mirror BWPs) .
  • a temporary BWP switching also referred to as a virtual BWP switch
  • mirror BWPs mirror bandwidth parts
  • FIG. 4 shows an example physical resource block (PRB) grid 400 within a carrier bandwidth 402 of a 5G NR network in accordance with various aspects of the disclosure.
  • the PRB grid 400 includes seven resource block groups (RBGs) , such as RBG_0 450, RBG_1 452, RBG_2 454, RBG_3 456, RBG_4 458, RBG_5 460, RBG_6 462.
  • the PRB grid 400 includes an active bandwidth part (BWP) 404 and mirror BWPs 406, 408, and 410.
  • each of the active BWP 404 and the mirror BWPs 406, 408, and 410 include 16 PRBs.
  • a UE may be RRC configured with a single active BWP and one or more mirror bandwidth parts (mirror BWPs) associated with the single active BWP.
  • mirror BWP as used herein may refer to a BWP that is offset (e.g., in terms of the frequency domain) from an active BWP.
  • a mirror BWP may have the same (or similar) RRC configuration as the active BWP of a UE and may cover different portions of the carrier bandwidth (e.g., carrier bandwidth 402) as compared to the active BWP.
  • the UE may be configured with the active BWP 404, the first mirror BWP 406, the second mirror BWP 408, and the third mirror BWP 410.
  • the first mirror BWP 406, the second mirror BWP 408, and the third mirror BWP 410 may respectively correspond to a first BWP-ID, a second BWP-ID, and a third BWP-ID.
  • each configuration for a mirror BWP may include at least a frequency domain (FD) offset relative to the single active BWP.
  • FD frequency domain
  • the first mirror BWP 406 may have a first frequency domain (FD) offset 414 relative to the active BWP 404
  • the second mirror BWP 408 may have a second FD offset 416 relative to the active BWP 404
  • the third mirror BWP 410 may have a third FD offset 418 relative to the active BWP 404.
  • FD frequency domain
  • the frequency domain (FD) offset relative to the single active BWP may be indicated as M physical resource blocks (PRBs) .
  • M may be a positive or negative integer.
  • the frequency domain (FD) offset relative to the single active BWP may be indicated as N resource block groups (RBGs) .
  • N may be a positive or negative integer.
  • each of the N RBGs may have the same RBG size as the active BWP.
  • the UE may determine that each of the N RBGs in the third FD offset 416 also has an RBG size of 4.
  • BWP Dynamic Bandwidth Part
  • SPS Semi-Persistent Scheduling
  • the active BWP may be reconfigured as the frequency domain resource allocation (FDRA) of the mirror BWP with additional changes relative to the active BWP.
  • FDRA frequency domain resource allocation
  • the additional changes may include a change in the total number of RBGs in the mirror BWP relative to the number of RBGs in the active BWP, changes in the starting and ending RBG sizes in the mirror BWP relative to the starting and ending RBG sizes in the active BWP, and/or changes in the starting and ending precoding resource block group (PRG) sizes relative to the starting and ending PRG sizes in the active BWP.
  • PRG precoding resource block group
  • the active BWP 404 and the second mirror BWP 408 demonstrate a change in the total number of RBGs in the second mirror BWP 408 relative to the number of RBGs in the active BWP 404.
  • the active BWP 404 includes a total of five RBGs (e.g., RBG_0 450, RBG_1 452, RBG_2 454, RBG_3 456, RBG_4 458) whereas the mirror BWP 408 includes a total of four RBGs (e.g., RBG_3 456, RBG_4 458, RBG_5 460, RBG_6 462) .
  • the active BWP 404 and the second mirror BWP 408 also demonstrate a change in the starting and ending RBG sizes in the second mirror BWP 408 relative to the starting and ending RBG sizes in the active BWP 404.
  • the starting RBG size of the active BWP 404 is one PRB (e.g., PRB 420) whereas the starting RBG size of the second mirror BWP 408 is four PRBs (e.g., the four PRBs 428) .
  • the ending RBG size of the active BWP 404 is three PRBs (e.g., the three PRBs 422) whereas the ending RBG size of the second mirror BWP 408 is four PRBs (e.g., the four PRBs 430) .
  • the active BWP 404 and the first mirror BWP 406 demonstrate a change in the starting and ending RBG sizes in the first mirror BWP 406 relative to the starting and ending RBG sizes in the active BWP 404.
  • the starting RBG size of the active BWP 404 is one PRB (e.g., PRB 420) whereas the starting RBG size of the first mirror BWP 406 is two PRBs (e.g., the two PRBs 424) .
  • the ending RBG size of the active BWP 404 is three PRBs (e.g., the three PRBs 422) whereas the ending RBG size of the first mirror BWP 406 is two PRBs (e.g., the two PRBs 426) .
  • the active BWP may be reconfigured as the FDRA of the mirror BWP, while other RRC configurations remain the same.
  • the UE since the UE can maintain its RRC configurations, the UE may avoid performing the often complex computations required for determining new or modified frequency resources. For example, the UE may not be required to process additional changes, such as a total number of RBGs, starting and ending RBG sizes, and/or starting and ending PRG sizes, as may be required in other aspects described herein.
  • the active BWP 404 and the third mirror BWP 410 demonstrate a scenario where the total number of RBGs in the third mirror BWP 410 relative to the total number of RBGs in the active BWP 404 remain the same.
  • the active BWP 404 includes a total of five RBGs (e.g., RBG_0 450, RBG_1 452, RBG_2 454, RBG_3 456, RBG_4 458) and the third mirror BWP 410 also includes a total of five RBGs (e.g., RBG_2 454, RBG_3 456, RBG_4 458, RBG_5 460, RBG_6 462) .
  • the active BWP 404 and the third mirror BWP 410 also demonstrate a scenario where the starting and ending RBG sizes in the third mirror BWP 410 and the starting and ending RBG sizes in the active BWP 404 remain the same.
  • the starting RBG size of the active BWP 404 is one PRB (e.g., the PRB 420) and the starting RBG size of the third mirror BWP 410 is one PRB (e.g., the PRB 432) .
  • an RRC configuration, MAC-CE, or DCI indicating a BWP-ID of one of the mirror BWPs as previously described may configure a CSI report to be transmitted by the UE and/or may trigger transmission of the CSI report from the UE.
  • the RRC configuration, MAC-CE, or DCI may configure an SRS transmission from the UE and/or may trigger the SRS transmission from the UE.
  • the RRC configuration, MAC-CE, or DCI may configure and/or trigger both the CSI report and the SRS transmission from the UE.
  • the UE may switch its original active BWP for the mirror BWP indicated by the BWP-ID, such that the mirror BWP becomes the active BWP of the UE.
  • the FDRA of the original active BWP may automatically become a replacement mirror BWP.
  • the FDRA of the original active BWP may become a replacement mirror BWP that replaces the mirror BWP indicated by the BWP-ID.
  • the UE may automatically switch back to the original active BWP.
  • the UE may receive an RRC configuration, MAC-CE, or DCI that reconfigures and/or indicates a BWP offset relative to its active BWP.
  • the BWP offset may be indicated as a number of physical resource blocks (PRBs) .
  • PRBs physical resource blocks
  • additional changes may include at least a total number of RBGs, starting and ending RBG sizes, and starting and ending PRG sizes.
  • the number of physical resource blocks (PRBs) may be a positive or negative integer.
  • the BWP offset may be indicated as a number of resource block groups (RBGs) .
  • the number of physical resource blocks may be a positive or negative integer.
  • the RBG size may be the same as the current active BWP of the UE. In these aspects of the disclosure, except for the BWP FD offset, there may be no additional changes to the BWP.
  • an RRC configuration, MAC-CE, or DCI indicating a BWP offset relative to its active BWP as previously described may configure a CSI report to be transmitted by the UE and/or may trigger transmission of the CSI report from the UE.
  • the RRC configuration, MAC-CE, or DCI may configure an SRS transmission from the UE and/or may trigger the SRS transmission from the UE.
  • the RRC configuration, MAC-CE, or DCI may configure and/or trigger both the CSI report and the SRS transmission from the UE.
  • FIG. 5 is a signal flow diagram in accordance with the various aspects of the disclosure.
  • the UE 502 may receive a first message 506 from the base station 504.
  • the message 506 may include first configuration information from a network including a BWP of a radio frequency (RF) carrier and a set of mirror BWPs associated with the BWP, each of the set of mirror BWPs including a frequency domain (FD) offset relative to the BWP.
  • the UE 502 may set the BWP as the active BWP of the UE 502.
  • the UE 502 may receive a first CSI measurement resource 510 and may measure 512 the CSI measurement resource using the active BWP. The UE may then transmit a first CSI report 514 to the base station 504 based on the measurement at 512.
  • the UE 502 may receive a second message 516 from the base station 504.
  • the second message 516 may include second configuration information indicating a mirror BWP in the set of mirror BWPs.
  • the UE 502 may reconfigure the active BWP to include frequency domain resources of the mirror BWP.
  • the UE 502 may receive a second CSI measurement resource 520 and may measure 522 the second CSI measurement resource 520 using the reconfigured active BWP. The UE may then transmit a second CSI report 524 to the base station 504 based on the measurement at 522.
  • FIG. 6 is a signal flow diagram in accordance with the various aspects of the disclosure.
  • the UE 602 may receive a first message 606 from the base station 604.
  • the message 606 may include first configuration information including a BWP of a radio frequency (RF) carrier.
  • the UE 602 may set the BWP as the active BWP of the UE 602.
  • the UE 602 may receive a first CSI measurement resource 610 and may measure 612 the CSI measurement resource using the active BWP. The UE may then transmit a first CSI report 614 to the base station 604 based on the measurement at 612.
  • the UE 602 may receive a second message 616 from the base station 604.
  • the second message 616 may include second configuration information indicating at least one frequency domain (FD) offset relative to the BWP.
  • the UE 602 may reconfigure the active BWP based on the FD offset.
  • the UE 602 may receive a second CSI measurement resource 620 and may measure 622 the second CSI measurement resource 620 using the reconfigured active BWP (also referred to as an offset BWP) .
  • the UE may then transmit a second CSI report 624 to the base station 604 based on the measurement at 622.
  • FIG. 7 is a flowchart 700 of a method of wireless communication in accordance with the various aspects of the disclosure.
  • the method may be performed by a UE (e.g., the UE 104; the apparatus 902/902'; the processing system 1014, which may include the memory 360 and which may be the entire UE 104 or a component of the UE 104, such as the TX processor 368, the RX processor 356, and/or the controller/processor 359) .
  • a UE e.g., the UE 104; the apparatus 902/902'; the processing system 1014, which may include the memory 360 and which may be the entire UE 104 or a component of the UE 104, such as the TX processor 368, the RX processor 356, and/or the controller/processor 359 .
  • the UE receives first configuration information from a network including a BWP of a radio frequency (RF) carrier and a set of mirror BWPs associated with the BWP, each of the set of mirror BWPs including a frequency domain (FD) offset relative to the BWP.
  • the frequency domain (FD) offset includes at least M physical resource blocks (PRBs) , wherein M is a positive or negative integer.
  • the frequency domain (FD) offset includes at least N resource block groups (RBGs) , wherein N is a positive or negative integer.
  • the active BWP includes one or more resource block groups (RBGs) , and wherein a size of each of the N resource block groups (RBGs) equals an RRC configured size of each of the one or more resource block groups (RBGs) excluding a starting and an ending RBG of the active BWP.
  • RBGs resource block groups
  • the UE sets the BWP as the active BWP of the UE.
  • the UE receives second configuration information from the network indicating a mirror BWP in the set of mirror BWPs.
  • the second configuration information includes a bandwidth part identifier (BWP-ID) corresponding to the mirror BWP in the set of mirror BWPs.
  • BWP-ID bandwidth part identifier
  • the second configuration information is included in a radio resource control (RRC) message, a media access control (MAC) control element (CE) message, or downlink control information (DCI) .
  • RRC radio resource control
  • MAC media access control
  • CE control element
  • DCI downlink control information
  • the second configuration information includes at least a channel state information report configuration, a trigger for a channel state information report transmission, a sounding reference signal configuration, or a trigger for a sounding reference signal transmission.
  • the UE reconfigures the active BWP to include frequency domain resources of the mirror BWP.
  • the reconfiguration of the active BWP to include the frequency domain resources of the mirror BWP changes at least one of a total number of resource block groups (RBGs) in the active BWP, a size of a starting resource block group (RBG) in the active BWP, a size of an ending resource block group (RBG) in the active BWP, a size of a starting precoding resource block group (PRG) in the active BWP, and a size of an ending precoding resource block group (PRG) in the active BWP.
  • RBGs resource block groups
  • the second configuration information includes a bandwidth part identifier (BWP-ID) corresponding to the mirror BWP in the set of mirror BWPs, and the reconfiguration of the active BWP to include the frequency domain resources of the mirror BWP avoids a change in any radio resource control (RRC) configuration for the active BWP.
  • BWP-ID bandwidth part identifier
  • the RRC configuration includes at least a total number of resource block groups (RBGs) in the active BWP, a size of a starting resource block group (RBG) in the active BWP, a size of an ending resource block group (RBG) in the active BWP, a size of a starting precoding resource block group (PRG) in the active BWP, and a size of an ending precoding resource block group (PRG) in the active BWP.
  • RBGs resource block groups
  • the UE replaces the frequency domain resources of the mirror BWP with the frequency domain resources of the active BWP.
  • the UE measures at least one channel state information (CSI) measurement resource using the reconfigured active BWP.
  • CSI channel state information
  • the UE transmits a channel state information (CSI) report based on the measurement.
  • CSI channel state information
  • the UE automatically switches the frequency domain resources of the reconfigured active BWP back to the frequency domain resources of the BWP received in the first configuration information.
  • FIG. 8 is a flowchart 800 of a method of wireless communication in accordance with the various aspects of the disclosure.
  • the method may be performed by a UE (e.g., the UE 104; the apparatus 902/902'; the processing system 1014, which may include the memory 360 and which may be the entire UE 104 or a component of the UE 104, such as the TX processor 368, the RX processor 356, and/or the controller/processor 359) .
  • a UE e.g., the UE 104; the apparatus 902/902'; the processing system 1014, which may include the memory 360 and which may be the entire UE 104 or a component of the UE 104, such as the TX processor 368, the RX processor 356, and/or the controller/processor 359 .
  • the UE receives first configuration information from a network including a BWP of a radio frequency (RF) carrier.
  • RF radio frequency
  • the UE sets the BWP as the active BWP of the UE.
  • the UE receives second configuration information from the network indicating at least one frequency domain (FD) offset relative to the BWP.
  • the frequency domain (FD) offset includes at least M physical resource blocks (PRBs) , wherein M is a positive or negative integer.
  • the frequency domain (FD) offset includes at least N resource block groups (RBGs) , wherein N is a positive or negative integer.
  • the active BWP includes one or more resource block groups (RBGs) , and wherein a size of each of the N resource block groups (RBGs) equals an RRC configured size of each of the one or more resource block groups (RBGs) excluding a starting and an ending RBG of the active BWP.
  • the second configuration information is included in a radio resource control (RRC) message, a media access control (MAC) control element (CE) message, or downlink control information (DCI) .
  • RRC radio resource control
  • MAC media access control
  • CE control element
  • DCI downlink control information
  • the second configuration information includes at least a channel state information report configuration, a trigger for a channel state information report transmission, a sounding reference signal configuration, or a trigger for a sounding reference signal transmission.
  • the UE reconfigures the active BWP based on the FD offset.
  • the UE reconfigures the active BWP based on the FD offset changes at least a total number of resource block groups (RBGs) in the active BWP, a size of a starting resource block group (RBG) in the active BWP, a size of an ending resource block group (RBG) in the active BWP, a size of a starting precoding resource block group (PRG) in the active BWP, and a size of an ending precoding resource block group (PRG) in the active BWP.
  • RBGs resource block groups
  • the UE reconfigures the active BWP based on the FD offset to avoid a change in any radio resource control (RRC) configuration for the active BWP.
  • RRC configuration includes at least a total number of resource block groups (RBGs) in the active BWP, a size of a starting resource block group (RBG) in the active BWP, a size of an ending resource block group (RBG) in the active BWP, a size of a starting precoding resource block group (PRG) in the active BWP, and a size of an ending precoding resource block group (PRG) in the active BWP.
  • RRC configuration includes at least a total number of resource block groups (RBGs) in the active BWP, a size of a starting resource block group (RBG) in the active BWP, a size of an ending resource block group (RBG) in the active BWP, a size of a starting precoding resource block group (PRG) in the active BWP, and a size of an
  • the UE measures at least one channel state information (CSI) measurement resource using the reconfigured active BWP.
  • CSI channel state information
  • the UE transmits a channel state information (CSI) report based on the measurement.
  • CSI channel state information
  • FIG. 9 is a conceptual data flow diagram 900 illustrating the data flow between different means/components in an example apparatus 902.
  • the apparatus may be a UE.
  • the apparatus includes a reception component 904.
  • the reception component 904 receives first configuration information from a network including a BWP of a radio frequency (RF) carrier (also referred to as a component carrier) and a set of mirror BWPs associated with the BWP, each of the set of mirror BWPs including a frequency domain (FD) offset relative to the BWP.
  • the reception component 904 further receives second configuration information from the network indicating a mirror BWP in the set of mirror BWPs.
  • the reception component 904 receives first configuration information from a network including a BWP of the RF carrier.
  • the reception component 904 further receives second configuration information from the network indicating at least one frequency domain (FD) offset relative to the BWP.
  • RF radio frequency
  • the apparatus further includes a transmission component 906 that transmits a channel state information (CSI) report based on a measurement of at least one CSI measurement resource.
  • the apparatus further includes a BWP setting component 908 that sets the BWP of the RF carrier as the active BWP of the UE.
  • the apparatus further includes a bandwidth part BWP reconfiguring component 910.
  • the BWP reconfiguring component 910 reconfigures the active BWP to include frequency domain resources of the mirror BWP.
  • the BWP reconfiguring component 910 reconfigures the active BWP based on the FD offset.
  • the BWP reconfiguring component 910 replaces the frequency domain resources of the active BWP with the frequency domain resources of the mirror BWP.
  • the BWP reconfiguring component 910 automatically switches the frequency domain resources of the reconfigured active BWP back to the frequency domain resources of the BWP received in the first configuration information after a predetermined, RRC configured, MAC-CE indicated, or DCI indicated time domain (TD) duration starting from a last symbol of the signal comprising the second configuration information.
  • the apparatus further includes a CSI measurement resource measuring component 912 that measures at least one channel state information (CSI) measurement resource using the reconfigured active BWP.
  • CSI channel state information
  • the apparatus may include additional components that perform each of the blocks of the algorithm in the aforementioned flowcharts of FIGs. 7 and 8. As such, each block in the aforementioned flowcharts of FIGs. 7 and 8 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. 10 is a diagram 1000 illustrating an example of a hardware implementation for an apparatus 902' employing a processing system 1014.
  • the processing system 1014 may be implemented with a bus architecture, represented generally by the bus 1024.
  • the bus 1024 may include any number of interconnecting buses and bridges depending on the specific application of the processing system 1014 and the overall design constraints.
  • the bus 1024 links together various circuits including one or more processors and/or hardware components, represented by the processor 1004, the components 904, 906, 908, 910, 912 and the computer-readable medium /memory 1006.
  • the bus 1024 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 1014 may be coupled to a transceiver 1010.
  • the transceiver 1010 is coupled to one or more antennas 1020.
  • the transceiver 1010 provides a means for communicating with various other apparatus over a transmission medium.
  • the transceiver 1010 receives a signal from the one or more antennas 1020, extracts information from the received signal, and provides the extracted information to the processing system 1014, specifically the reception component 904.
  • the transceiver 1010 receives information from the processing system 1014, specifically the transmission component 906, and based on the received information, generates a signal to be applied to the one or more antennas 1020.
  • the processing system 1014 includes a processor 1004 coupled to a computer-readable medium /memory 1006.
  • the processor 1004 is responsible for general processing, including the execution of software stored on the computer-readable medium /memory 1006.
  • the software when executed by the processor 1004, causes the processing system 1014 to perform the various functions described supra for any particular apparatus.
  • the computer-readable medium /memory 1006 may also be used for storing data that is manipulated by the processor 1004 when executing software.
  • the processing system 1014 further includes at least one of the components 904, 906, 908, 910, 912.
  • the components may be software components running in the processor 1004, resident/stored in the computer readable medium /memory 1006, one or more hardware components coupled to the processor 1004, or some combination thereof.
  • the processing system 1014 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 1014 may be the entire UE (e.g., see 350 of FIG. 3) .
  • the apparatus 902/902' for wireless communication includes means for receiving first configuration information from a network including a BWP of a radio frequency (RF) carrier and a set of mirror BWPs associated with the BWP, each of the set of mirror BWPs including a frequency domain (FD) offset relative to the BWP, means for setting the BWP as the active BWP of the UE, means for receiving second configuration information from the network indicating a mirror BWP in the set of mirror BWPs, means for reconfiguring the active BWP to include frequency domain resources of the mirror BWP, means for replacing the frequency domain resources of the active BWP with the frequency domain resources of the mirror BWP, means for automatically switching the frequency domain resources of the reconfigured active BWP back to the frequency domain resources of the BWP received in the first configuration information after a predetermined, RRC configured, media access control control element (MAC-CE) indicated, or downlink control information (DCI) indicated time domain (TD) duration starting from a last symbol of the signal comprising RF
  • the aforementioned means may be one or more of the aforementioned components of the apparatus 902 and/or the processing system 1014 of the apparatus 902' configured to perform the functions recited by the aforementioned means.
  • the processing system 1014 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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  • Engineering & Computer Science (AREA)
  • Signal Processing (AREA)
  • Computer Networks & Wireless Communication (AREA)
  • Mobile Radio Communication Systems (AREA)

Abstract

Des aspects de la divulgation se rapportent à un équipement utilisateur (UE) configuré pour recevoir des premières informations de configuration en provenance d'un réseau comprenant une partie de bande passante (BWP) d'une porteuse radiofréquence (RF) et un ensemble de BWP miroir associé à la BWP, chacune de l'ensemble de BWP miroir comprenant un domaine de fréquence (FD) décalé par rapport à la BWP, régler la BWP en tant que BWP active de l'UE, recevoir des secondes informations de configuration en provenance du réseau indiquant une BWP miroir dans l'ensemble de BWP miroir, et reconfigurer la BWP active pour inclure des ressources de domaine de fréquence de la BWP miroir.
PCT/CN2020/073977 2020-01-23 2020-01-23 Miroirs de partie de bande passante (bwp) pour équipements utilisateurs à faible complexité nde passante limitée WO2021147074A1 (fr)

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CN109586881A (zh) * 2017-09-29 2019-04-05 株式会社Kt 用于在新无线电中切换带宽部分的方法和装置
US20190357085A1 (en) * 2018-05-21 2019-11-21 Intel Corporation Bandwidth part (bwp) switching
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