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WO2022052028A1 - Procédés et appareils d'améliorations de fiabilité de réseaux de communication machine massive (mmtc) - Google Patents

Procédés et appareils d'améliorations de fiabilité de réseaux de communication machine massive (mmtc) Download PDF

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Publication number
WO2022052028A1
WO2022052028A1 PCT/CN2020/114714 CN2020114714W WO2022052028A1 WO 2022052028 A1 WO2022052028 A1 WO 2022052028A1 CN 2020114714 W CN2020114714 W CN 2020114714W WO 2022052028 A1 WO2022052028 A1 WO 2022052028A1
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WO
WIPO (PCT)
Prior art keywords
connection
ran
timing schedule
node
secondary node
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PCT/CN2020/114714
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English (en)
Inventor
Nan Zhang
Yongjun XU
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Qualcomm Incorporated
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Publication date
Application filed by Qualcomm Incorporated filed Critical Qualcomm Incorporated
Priority to PCT/CN2020/114714 priority Critical patent/WO2022052028A1/fr
Publication of WO2022052028A1 publication Critical patent/WO2022052028A1/fr

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    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04W—WIRELESS COMMUNICATION NETWORKS
    • H04W76/00—Connection management
    • H04W76/10—Connection setup
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04W—WIRELESS COMMUNICATION NETWORKS
    • H04W72/00—Local resource management
    • H04W72/12—Wireless traffic scheduling
    • H04W72/1215—Wireless traffic scheduling for collaboration of different radio technologies

Definitions

  • the present disclosure relates generally to communication systems, and more particularly, to massive machine-type communications (mMTC) network reliability in wireless communication systems.
  • mMTC massive machine-type communications
  • 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 (pc) 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
  • Some aspects of 5G NR may be based on the 4G Long Term Evolution (LTE) standard.
  • LTE Long Term Evolution
  • the apparatus may be a user equipment (UE) .
  • the apparatus may configure a medium access control (MAC) layer for a connection to at least one primary node and a connection to the at least one secondary node.
  • the apparatus may also register with at least one of a network or a RAN.
  • the apparatus may also receive a radio access network (RAN) timing schedule for at least one primary node and at least one secondary node, the RAN timing schedule including a primary node connection time and a secondary node connection time.
  • the apparatus may transmit an acknowledgement (ACK) upon receiving the RAN timing schedule.
  • the apparatus may also identify an occurrence of at least one of the primary node connection time or the secondary node connection time.
  • the apparatus may also establish a connection, via a MAC layer, to the at least one primary node at the primary node connection time, the connection to the at least one primary node being based on the RAN timing schedule. Further, the apparatus may communicate data with the at least one primary node based on the connection via the MAC layer. The apparatus may also establish a connection, via the MAC layer, to the at least one secondary node at the secondary node connection time, the connection to the at least one secondary node being based on the RAN timing schedule. The apparatus may also communicate data with the at least one secondary node based on the connection via the MAC layer.
  • a method, a computer-readable medium, and an apparatus may be a node or a base station.
  • the apparatus may configure a medium access control (MAC) layer for a connection to at least one UE.
  • the apparatus may also register with the at least one UE.
  • the apparatus may also determine a radio access network (RAN) timing schedule for at least one UE, the RAN timing schedule including a primary node connection time and a secondary node connection time.
  • the apparatus may transmit the RAN timing schedule to the at least one UE.
  • the apparatus may also receive an acknowledgement (ACK) upon transmitting the RAN timing schedule.
  • ACK acknowledgement
  • the apparatus may also establish a connection, via a MAC layer, to the at least one UE at the primary node connection time or the secondary node connection time, the connection to the at least one UE being based on the RAN timing schedule. Also, the apparatus may communicate data with the at least one UE based on the connection via the MAC layer.
  • 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.
  • FIG. 2A is a diagram illustrating an example of a first frame, in accordance with various aspects of the present disclosure.
  • FIG. 2B is a diagram illustrating an example of DL channels within a subframe, in accordance with various aspects of the present disclosure.
  • FIG. 2C is a diagram illustrating an example of a second frame, in accordance with various aspects of the present disclosure.
  • FIG. 2D is a diagram illustrating an example of UL channels within a subframe, in accordance with various aspects of the present disclosure.
  • 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 is a diagram illustrating an example communication protocol in accordance with one or more techniques of the present disclosure.
  • FIG. 5 is a diagram illustrating an example communication protocol in accordance with one or more techniques of the present disclosure.
  • FIG. 6 is a diagram illustrating example communication between a UE and a base station in accordance with one or more techniques of the present disclosure.
  • FIG. 7 is a flowchart of a method of wireless communication.
  • FIG. 8 is a flowchart of a method of wireless communication.
  • FIG. 9 is a diagram illustrating an example of a hardware implementation for an example apparatus.
  • FIG. 10 is a diagram illustrating an example of a hardware implementation for an example apparatus.
  • 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 first backhaul links 132, the second backhaul links 184, and 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, WiMedia, Bluetooth, ZigBe
  • 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, e.g., in a 5 GHz unlicensed frequency spectrum or the like.
  • AP Wi-Fi access point
  • STAs Wi-Fi stations
  • communication links 154 e.g., in a 5 GHz unlicensed frequency spectrum or the like.
  • 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 unlicensed frequency spectrum (e.g., 5 GHz, or the like) 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.
  • the small cell 102' employing NR in an unlicensed frequency spectrum, may boost coverage to and/or increase capacity of the access network.
  • the electromagnetic spectrum is often subdivided, based on frequency/wavelength, into various classes, bands, channels, etc.
  • two initial operating bands have been identified as frequency range designations FR1 (410 MHz –7.125 GHz) and FR2 (24.25 GHz –52.6 GHz) .
  • the frequencies between FR1 and FR2 are often referred to as mid-band frequencies.
  • FR1 is often referred to (interchangeably) as a “sub-6 GHz” band in various documents and articles.
  • FR2 which is often referred to (interchangeably) as a “millimeter wave” band in documents and articles, despite being different from the extremely high frequency (EHF) band (30 GHz –300 GHz) which is identified by the International Telecommunications Union (ITU) as a “millimeter wave” band.
  • EHF extremely high frequency
  • ITU International Telecommunications Union
  • sub-6 GHz or the like if used herein may broadly represent frequencies that may be less than 6 GHz, may be within FR1, or may include mid-band frequencies.
  • millimeter wave or the like if used herein may broadly represent frequencies that may include mid-band frequencies, may be within FR2, or may be within the EHF band.
  • 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, such as gNB 180 may operate in a traditional sub 6 GHz spectrum, in millimeter wave frequencies, and/or near millimeter wave frequencies in communication with the UE 104.
  • the gNB 180 may be referred to as a millimeter wave base station.
  • the millimeter wave base station 180 may utilize beamforming 182 with the UE 104 to compensate for the 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 an 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 Packet Switch (PS) Streaming (PSS) Service, and/or other IP services.
  • IMS IP Multimedia Subsystem
  • PS Packet Switch
  • PSS Packet
  • 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.
  • the UE 104 may include a reception component 198 configured to configure a medium access control (MAC) layer for a connection to at least one primary node and a connection to the at least one secondary node.
  • Reception component 198 may also be configured to register with at least one of a network or a RAN.
  • Reception component 198 may also be configured to receive a radio access network (RAN) timing schedule for at least one primary node and at least one secondary node, the RAN timing schedule including a primary node connection time and a secondary node connection time.
  • RAN radio access network
  • Reception component 198 may also be configured to transmit an acknowledgement (ACK) upon receiving the RAN timing schedule.
  • ACK acknowledgement
  • Reception component 198 may also be configured to identify an occurrence of at least one of the primary node connection time or the secondary node connection time. Reception component 198 may also be configured to establish a connection, via a MAC layer, to the at least one primary node at the primary node connection time, the connection to the at least one primary node being based on the RAN timing schedule. Reception component 198 may also be configured to communicate data with the at least one primary node based on the connection via the MAC layer. Reception component 198 may also be configured to establish a connection, via the MAC layer, to the at least one secondary node at the secondary node connection time, the connection to the at least one secondary node being based on the RAN timing schedule. Reception component 198 may also be configured to communicate data with the at least one secondary node based on the connection via the MAC layer.
  • the base station 180 may include a transmission component 199 configured to configure a medium access control (MAC) layer for a connection to at least one UE.
  • Transmission component 199 may also be configured to register with the at least one UE.
  • Transmission component 199 may also be configured to determine a radio access network (RAN) timing schedule for at least one UE, the RAN timing schedule including a primary node connection time and a secondary node connection time.
  • Transmission component 199 may also be configured to transmit the RAN timing schedule to the at least one UE.
  • Transmission component 199 may also be configured to receive an acknowledgement (ACK) upon transmitting the RAN timing schedule.
  • ACK acknowledgement
  • Transmission component 199 may also be configured to establish a connection, via a MAC layer, to the at least one UE at the primary node connection time or the secondary node connection time, the connection to the at least one UE being based on the RAN timing schedule. Transmission component 199 may also be configured to communicate data with the at least one UE based on the connection via the MAC layer.
  • 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 frequency division duplexed (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 time division duplexed (TDD) in which for a particular set of subcarriers (carrier system bandwidth) , subframes within the set of subcarriers are dedicated for both DL and UL.
  • FDD frequency division duplexed
  • TDD time division duplexed
  • 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 F is flexible for use between DL/UL, and subframe 3 being configured with slot format 1 (with all UL) . While subframes 3, 4 are shown with slot formats 1, 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 4 allow for 1, 2, 4, 8, and 16 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 4.
  • the symbol length/duration is inversely related to the subcarrier spacing.
  • the slot duration is 0.25 ms
  • the subcarrier spacing is 60 kHz
  • the symbol duration is approximately 16.67 ⁇ s.
  • Each BWP may have a particular numerology.
  • 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 for one particular configuration, 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) (e.g., 1, 2, 4, 8, or 16 CCEs) , each CCE including six RE groups (REGs) , each REG including 12 consecutive REs in an OFDM symbol of an RB.
  • CCEs control channel elements
  • REGs RE groups
  • a PDCCH within one BWP may be referred to as a control resource set (CORESET) .
  • CORESET control resource set
  • a UE is configured to monitor PDCCH candidates in a PDCCH search space (e.g., common search space, UE-specific search space) during PDCCH monitoring occasions on the CORESET, where the PDCCH candidates have different DCI formats and different aggregation levels. Additional BWPs may be located at greater and/or lower frequencies across the channel bandwidth.
  • 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 (also referred to as SS block (SSB) ) .
  • the MIB provides a number of RBs in the system bandwidth and a system frame number (SFN) .
  • the physical downlink shared channel (PDSCH) carries user data, broadcast system information not transmitted through the PBCH such as system information blocks (SIBs) , and paging messages.
  • SIBs system information blocks
  • some of the REs carry DM-RS (indicated as R for one particular configuration, but other DM-RS configurations are possible) for channel estimation at the base station.
  • the UE may transmit DM-RS for the physical uplink control channel (PUCCH) and DM-RS for the physical uplink shared channel (PUSCH) .
  • the PUSCH DM-RS may be transmitted in the first one or two symbols of the PUSCH.
  • the PUCCH DM-RS may be transmitted in different configurations depending on whether short or long PUCCHs are transmitted and depending on the particular PUCCH format used.
  • the UE may transmit sounding reference signals (SRS) .
  • the SRS may be transmitted in the last symbol of a subframe.
  • the SRS may have a comb structure, and a UE may transmit SRS on one of the combs.
  • the SRS may be used by a base station for channel quality estimation to enable frequency-dependent scheduling on the UL.
  • FIG. 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 hybrid automatic repeat request (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 318 TX.
  • Each transmitter 318 TX may modulate an RF carrier with a respective spatial stream for transmission.
  • each receiver 354 RX receives a signal through its respective antenna 352.
  • Each receiver 354 RX 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.
  • Some aspects of wireless communication can utilize massive machine-type communications (mMTC) .
  • Networks utilizing mMTC can provide connectivity to a large number of devices, where each of the devices may transmit and receive a small amount of data.
  • the large amount of data generated from each of the interconnected devices may be aggregated and analyzed in order to control the surrounding environment.
  • a mMTC network can include a number of characteristics, e.g., a tolerance of latencies and/or throughput, efficiency for the transmission or reception of small amounts of data, and data transmitted or received with a low bandwidth.
  • MR-DC multiple radio access technology dual connectivity
  • NR-NR dual connectivity may be utilized.
  • MR-DC may be utilized by mMTC networks and UEs.
  • wireless networks may provide for a high density low cost mMTC UE NR-NR dual connectivity in order to increase UE reliability and network or base station coverage.
  • the size or cost of mMTC UEs may be sensitive.
  • a dual independent medium access control (MAC) layer structure may be utilized for master/primary node connections and secondary node connections. By doing so, this may increase the complexity or cost of UEs, the power utilized at the UE, and/or UE physical sizes. Accordingly, for mMTC UEs, utilizing dual independent MACs may increase the cost, power, and/or size of a UE. Also, MR-DC networks may provide improved benefits in reliability and coverage. As such, it may be an issue to balance NR-NR dual connectivity with the UE cost, UE size, and power utilized of mMTC UEs or networks.
  • MAC medium access control
  • two independent MAC layers may be utilized for mMTC UEs to connect to master/primary nodes and secondary nodes.
  • the master/primary connection with the master/primary cell or node may correspond to one RAT and the secondary connection with the secondary cell or node may correspond to another RAT.
  • the MAC layout may be designed as a function of the complexity UE. For instance, there may be hardware components corresponding to each of the MAC layers. Also, there may be software or state machines to implement the function of each MAC at the UE.
  • FIG. 4 is a diagram 400 illustrating a communication protocol for UE 402.
  • diagram 400 includes a quality of service (QoS) or communication flow associated with UE 402.
  • QoS quality of service
  • diagram 400 includes service data adaptation protocol (SDAP) 410, NR packet data convergence protocol (PDCP) 420, NR PDCP 422, NR PDCP 424, master node (MN) radio link control (RLC) protocol 430, MN RLC protocol 432, secondary node (SN) RLC protocol 440, SN RLC protocol 442.
  • SDAP service data adaptation protocol
  • PDCP packet data convergence protocol
  • PDCP packet data convergence protocol
  • RLC radio link control
  • MN RLC protocol 432 MN RLC protocol 432
  • SN secondary node
  • Diagram 400 includes a separate medium access control (MAC) layer for the master node, e.g., MN MAC 450, and a separate MAC layer for the secondary node, e.g., SN MAC 460. Accordingly, FIG. 4 illustrates that UE 402 may utilize two independent MACs, e.g., a master node MAC and a secondary node MAC. FIG. 4 depicts one example of a QoS or communication flow that is split for dual connectivity.
  • MAC medium access control
  • a flow for the primary or master node i.e., a master cell group (MCG) bearer
  • MCG master cell group
  • a flow for the secondary node i.e., a secondary cell group (SCG) bearer
  • SCG secondary cell group
  • the split flow for the master node and the secondary node may represent a split connectivity, e.g., the flow from SDAP 410 to NR PDCP 422 to RLCs 432/440 to MACs 450/460.
  • FIG. 4 displays that some aspects of wireless communication may utilize multiple MACs for dual connectivity, e.g., MAC 450 for the master node and MAC 460 for the secondary node.
  • mMTC UEs may not be sensitive to delays or latency. As such, mMTC UEs may not be concerned with delays in data packet transmission. Based on this, mMTC UEs may utilize certain types of wireless communication for this timing, e.g., TDD communication. This TDD communication may be more suitable for UEs that include a simpler design and a lower cost, e.g., UEs that utilize fewer components or control layers.
  • TDD communication may be more suitable for UEs that include a simpler design and a lower cost, e.g., UEs that utilize fewer components or control layers.
  • a single MAC layer e.g., a TDD MAC. It may also be beneficial for a single MAC to be utilized with mMTC UEs and networks or base stations. By doing so, UEs may be capable of reducing the design complexity of the UE, the cost of the UE, and/or the power utilized by the UE. Additionally, it may be beneficial for a single TDD MAC for mMTC UEs to connect to master/primary nodes and/or secondary nodes in time division.
  • aspects of the present disclosure may provide NR dual connectivity via a single MAC layer, e.g., a TDD MAC.
  • aspects of the present disclosure may utilize a single MAC with mMTC UEs and networks or base stations.
  • aspects of the present disclosure may also provide for a single TDD MAC for mMTC UEs to connect to master/primary nodes and/or secondary nodes sequentially in time division. As such, aspects of the present disclosure may reduce the design complexity of UEs, the cost of UEs, and/or the power utilized by UEs.
  • a UE may utilize a single MAC to connect to a primary or master node and a secondary node sequentially in time division.
  • the network or radio access network (RAN) may schedule a different time occasion for a primary/master node connection and a connection for secondary node (s) .
  • the UE may connect to the primary or master node following a RAN assigned time occasion.
  • the UE may connect to the secondary node (s) following another RAN assigned time occasion.
  • the UE may connect to the primary node and the secondary node (s) sequentially in time division.
  • the primary or master node and the secondary node (s) may connect to the UE following a different scheduled time occasion.
  • a single MAC may provide a primary connection to a primary cell or node. After a certain time period, the single MAC may provide a secondary connection to a secondary cell or node.
  • This time division dual connectivity of the MAC may follow a timing schedule of a RAN. So the RAN or network may schedule or instruct the UE to connect to a primary node or a secondary node based on a determined timing schedule. The RAN or network may also instruct the UE to switch between the primary connection and the secondary connection.
  • FIG. 5 is a diagram 500 illustrating a communication protocol for UE 502.
  • diagram 500 includes a quality of service (QoS) or communication flow associated with UE 502.
  • QoS quality of service
  • diagram 500 includes service data adaptation protocol (SDAP) 510, NR packet data convergence protocol (PDCP) 520, NR PDCP 522, NR PDCP 524, master node (MN) radio link control (RLC) protocol 530, MN RLC protocol 532, secondary node (SN) RLC protocol 540, and SN RLC protocol 542.
  • Diagram 500 also includes a single medium access control (MAC) layer for a master or primary node and a secondary node, e.g., MAC 550.
  • MAC medium access control
  • FIG. 5 illustrates that UE 502 may utilize an independent MAC, e.g., MAC 550, for both the master/primary node and the secondary node.
  • FIG. 5 depicts one example of a QoS or communication flow that is split between dual connectivity.
  • the flow for the primary or master node may represent a primary connectivity, e.g., the flow from SDAP 510 to NR PDCP 520 to MN RLC 530 to MAC 550.
  • the flow for the secondary node may represent a secondary connectivity, e.g., the flow from SDAP 510 to NR PDCP 524 to SN RLC 542 to MAC 550.
  • a split flow for the master node and the secondary node may represent a split connectivity, e.g., the flow from SDAP 510 to NR PDCP 522 to RLCs 532/540 to MAC 550.
  • FIG. 5 displays that some aspects of wireless communication may utilize a single MAC, e.g., MAC 550, for both the master/primary node and the secondary node for dual connectivity of a UE, e.g., UE 502.
  • a UE can register with the RAN or network via the primary or master node.
  • the UE can also receive a scheduling message or signaling message from the primary or master node.
  • the UE can register with the RAN or network via the secondary node (s) .
  • the UE can also receive a scheduling message or signaling message from the secondary node (s) .
  • aspects of the present disclosure may include a number of different benefits or advantages. Some aspects of the present disclosure may reduce the complexity or cost of UEs, reduce the power utilized at UEs, and reduce a size of MR-DC for mMTC UEs. In some instances, mMTC UEs may not request a strong delay or bandwidth, but they may request a strong reliability or coverage. Aspects of the present disclosure may increase the reliability and/or coverage of mMTC UEs.
  • FIG. 6 is a diagram 600 illustrating example communication between a UE 602 and a node or base station 604.
  • UE 602 may configure a medium access control (MAC) layer for a connection to at least one primary node, e.g., node 604, and a connection to the at least one secondary node.
  • node 604 may configure a MAC layer for a connection to at least one UE, e.g., UE 602.
  • the MAC layer may be associated with dual connectivity time division duplexing (TDD) .
  • the MAC layer may be associated with a single state machine corresponding to the UE.
  • UE 602 may register with at least one of a network or a RAN, e.g., via node 604.
  • node 604 may register with at least one UE, e.g., UE 602.
  • node 604 may determine a radio access network (RAN) timing schedule for at least one UE, e.g., UE 602, the RAN timing schedule including a primary node connection time and a secondary node connection time.
  • the RAN timing schedule may be associated with multiple radio access technology (RAT) dual connectivity (MR-DC) .
  • RAT radio access technology
  • MR-DC radio access technology dual connectivity
  • node 604 may transmit the RAN timing schedule, e.g., RAN timing schedule 644, to the at least one UE, e.g., UE 602.
  • UE 602 may receive a RAN timing schedule, e.g., RAN timing schedule 644, for at least one primary node, e.g., node 604, and at least one secondary node, the RAN timing schedule including a primary node connection time and a secondary node connection time.
  • the RAN timing schedule is received or transmitted via at least one scheduling message.
  • the at least one scheduling message may be received or transmitted from at least one of the at least one primary node, e.g., node 604, or the at least one secondary node.
  • UE 602 may transmit an acknowledgement (ACK) , e.g., ACK 654, upon receiving the RAN timing schedule.
  • ACK acknowledgement
  • node 604 may receive an ACK, e.g., ACK 654, upon transmitting the RAN timing schedule.
  • UE 602 may identify an occurrence of at least one of the primary node connection time or the secondary node connection time.
  • UE 602 may establish a connection, via a MAC layer, to the at least one primary node, e.g., node 604, at the primary node connection time, the connection to the at least one primary node being based on the RAN timing schedule.
  • node 604 may establish a connection, via a MAC layer, to the at least one UE, e.g., UE 602, at the primary node connection time or the secondary node connection time, the connection to the at least one UE being based on the RAN timing schedule.
  • UE 602 may communicate data, e.g., data 674, with the at least one primary node, e.g., node 604, based on the connection via the MAC layer.
  • node 604 may communicate data, e.g., data 674, with the at least one UE, e.g., UE 602, based on the connection via the MAC layer.
  • communicating data may comprise transmitting or receiving at least one of one or more data packets or one or more bit packets.
  • UE 602 may establish a connection, via the MAC layer, to the at least one secondary node at the secondary node connection time, the connection to the at least one secondary node being based on the RAN timing schedule.
  • at least one of the connection to the at least one primary node or the connection to the at least one secondary node may be further established via at least one of a packet data convergence protocol (PDCP) or a radio link control (RLC) protocol.
  • PDCP packet data convergence protocol
  • RLC radio link control
  • UE 602 may communicate data with the at least one secondary node based on the connection via the MAC layer. Also, communicating data may comprise transmitting or receiving at least one of one or more data packets or one or more bit packets.
  • FIG. 7 is a flowchart 700 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, 602; the apparatus 902; a processing system, which may include the memory 360 and which may be the entire UE or a component of the UE, such as the TX processor 368, the controller/processor 359, transmitter 354TX, antenna (s) 352, and/or the like) .
  • a processing system which may include the memory 360 and which may be the entire UE or a component of the UE, such as the TX processor 368, the controller/processor 359, transmitter 354TX, antenna (s) 352, and/or the like.
  • Optional aspects are illustrated with a dashed line.
  • the methods described herein can provide a number of benefits, such as improving communication signaling, resource utilization, and/or power savings.
  • the apparatus may configure a medium access control (MAC) layer for a connection to at least one primary node and a connection to the at least one secondary node, as described in connection with the examples in FIGs. 4, 5, and 6.
  • 702 may be performed by determination component 940.
  • the MAC layer may be associated with dual connectivity time division duplexing (TDD) , as described in connection with the examples in FIGs. 4, 5, and 6.
  • TDD time division duplexing
  • the MAC layer may be associated with a single state machine corresponding to the UE, as described in connection with the examples in FIGs. 4, 5, and 6.
  • the apparatus may register with at least one of a network or a RAN, as described in connection with the examples in FIGs. 4, 5, and 6.
  • 704 may be performed by determination component 940.
  • the apparatus may receive a RAN timing schedule for at least one primary node and at least one secondary node, the RAN timing schedule including a primary node connection time and a secondary node connection time, as described in connection with the examples in FIGs. 4, 5, and 6.
  • 706 may be performed by determination component 940.
  • the RAN timing schedule may be associated with multiple radio access technology (RAT) dual connectivity (MR-DC) , as described in connection with the examples in FIGs. 4, 5, and 6.
  • RAT radio access technology
  • MR-DC dual connectivity
  • the RAN timing schedule may be received via at least one scheduling message, as described in connection with the examples in FIGs. 4, 5, and 6.
  • the at least one scheduling message may be received from at least one of the at least one primary node or the at least one secondary node, as described in connection with the examples in FIGs. 4, 5, and 6.
  • the apparatus may transmit an acknowledgement (ACK) upon receiving the RAN timing schedule, as described in connection with the examples in FIGs. 4, 5, and 6.
  • ACK acknowledgement
  • 708 may be performed by determination component 940.
  • the apparatus may identify an occurrence of at least one of the primary node connection time or the secondary node connection time, as described in connection with the examples in FIGs. 4, 5, and 6. For example, 710 may be performed by determination component 940.
  • the apparatus may establish a connection, via a MAC layer, to the at least one primary node at the primary node connection time, the connection to the at least one primary node being based on the RAN timing schedule, as described in connection with the examples in FIGs. 4, 5, and 6.
  • 712 may be performed by determination component 940.
  • the apparatus may communicate data with the at least one primary node based on the connection via the MAC layer, as described in connection with the examples in FIGs. 4, 5, and 6.
  • 714 may be performed by determination component 940.
  • communicating data may comprise transmitting or receiving at least one of one or more data packets or one or more bit packets, as described in connection with the examples in FIGs. 4, 5, and 6.
  • the apparatus may establish a connection, via the MAC layer, to the at least one secondary node at the secondary node connection time, the connection to the at least one secondary node being based on the RAN timing schedule, as described in connection with the examples in FIGs. 4, 5, and 6.
  • 716 may be performed by determination component 940.
  • at least one of the connection to the at least one primary node or the connection to the at least one secondary node may be further established via at least one of a packet data convergence protocol (PDCP) or a radio link control (RLC) protocol, as described in connection with the examples in FIGs. 4, 5, and 6.
  • PDCP packet data convergence protocol
  • RLC radio link control
  • the apparatus may communicate data with the at least one secondary node based on the connection via the MAC layer, as described in connection with the examples in FIGs. 4, 5, and 6. For example, 718 may be performed by determination component 940. Also, communicating data may comprise transmitting or receiving at least one of one or more data packets or one or more bit packets, as described in connection with the examples in FIGs. 4, 5, and 6.
  • FIG. 8 is a flowchart 800 of a method of wireless communication.
  • the method may be performed by a node or base station or a component of a node or base station (e.g., the base station 102, 180, 310, 604; the apparatus 1002; a processing system, which may include the memory 376 and which may be the entire base station or a component of the base station, such as the antenna (s) 320, receiver 318RX, the RX processor 370, the controller/processor 375, and/or the like) .
  • Optional aspects are illustrated with a dashed line.
  • the methods described herein can provide a number of benefits, such as improving communication signaling, resource utilization, and/or power savings.
  • the apparatus may configure a medium access control (MAC) layer for a connection to at least one UE, as described in connection with the examples in FIGs. 4, 5, and 6.
  • 802 may be performed by determination component 1040.
  • the MAC layer may be associated with dual connectivity time division duplexing (TDD) , as described in connection with the examples in FIGs. 4, 5, and 6.
  • TDD time division duplexing
  • the MAC layer may be associated with a single state machine corresponding to the UE, as described in connection with the examples in FIGs. 4, 5, and 6.
  • the apparatus may register with the at least one UE, as described in connection with the examples in FIGs. 4, 5, and 6.
  • 804 may be performed by determination component 1040.
  • the apparatus may determine a radio access network (RAN) timing schedule for at least one UE, the RAN timing schedule including a primary node connection time and a secondary node connection time, as described in connection with the examples in FIGs. 4, 5, and 6.
  • RAN radio access network
  • the RAN timing schedule may be associated with multiple radio access technology (RAT) dual connectivity (MR-DC) , as described in connection with the examples in FIGs. 4, 5, and 6.
  • RAT radio access technology
  • MR-DC dual connectivity
  • the apparatus may transmit the RAN timing schedule to the at least one UE, as described in connection with the examples in FIGs. 4, 5, and 6.
  • 808 may be performed by determination component 1040.
  • the RAN timing schedule may be transmitted via at least one scheduling message, as described in connection with the examples in FIGs. 4, 5, and 6.
  • the apparatus may receive an acknowledgement (ACK) upon transmitting the RAN timing schedule, as described in connection with the examples in FIGs. 4, 5, and 6.
  • ACK acknowledgement
  • the apparatus may receive an acknowledgement (ACK) upon transmitting the RAN timing schedule, as described in connection with the examples in FIGs. 4, 5, and 6.
  • 810 may be performed by determination component 1040.
  • the apparatus may establish a connection, via a MAC layer, to the at least one UE at the primary node connection time or the secondary node connection time, the connection to the at least one UE being based on the RAN timing schedule, as described in connection with the examples in FIGs. 4, 5, and 6.
  • 812 may be performed by determination component 1040.
  • the connection to the at least one UE may be further established via at least one of a packet data convergence protocol (PDCP) or a radio link control (RLC) protocol, as described in connection with the examples in FIGs. 4, 5, and 6.
  • PDCP packet data convergence protocol
  • RLC radio link control
  • an occurrence of at least one of the primary node connection time or the secondary node connection time may be identified by the at least one UE, as described in connection with the examples in FIGs. 4, 5, and 6.
  • the apparatus may communicate data with the at least one UE based on the connection via the MAC layer, as described in connection with the examples in FIGs. 4, 5, and 6.
  • 814 may be performed by determination component 1040.
  • communicating data may comprise receiving or transmitting at least one of one or more data packets or one or more bit packets, as described in connection with the examples in FIGs. 4, 5, and 6.
  • FIG. 9 is a diagram 900 illustrating an example of a hardware implementation for an apparatus 902.
  • the apparatus 902 is a UE and includes a cellular baseband processor 904 (also referred to as a modem) coupled to a cellular RF transceiver 922 and one or more subscriber identity modules (SIM) cards 920, an application processor 906 coupled to a secure digital (SD) card 908 and a screen 910, a Bluetooth module 912, a wireless local area network (WLAN) module 914, a Global Positioning System (GPS) module 916, and a power supply 918.
  • the cellular baseband processor 904 communicates through the cellular RF transceiver 922 with the UE 104 and/or BS 102/180.
  • the cellular baseband processor 904 may include a computer-readable medium /memory.
  • the computer-readable medium /memory may be non-transitory.
  • the cellular baseband processor 904 is responsible for general processing, including the execution of software stored on the computer-readable medium /memory.
  • the software when executed by the cellular baseband processor 904, causes the cellular baseband processor 904 to perform the various functions described supra.
  • the computer-readable medium /memory may also be used for storing data that is manipulated by the cellular baseband processor 904 when executing software.
  • the cellular baseband processor 904 further includes a reception component 930, a communication manager 932, and a transmission component 934.
  • the communication manager 932 includes the one or more illustrated components.
  • the components within the communication manager 932 may be stored in the computer-readable medium /memory and/or configured as hardware within the cellular baseband processor 904.
  • the cellular baseband processor 904 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.
  • the apparatus 902 may be a modem chip and include just the baseband processor 904, and in another configuration, the apparatus 902 may be the entire UE (e.g., see 350 of FIG. 3) and include the aforediscussed additional modules of the apparatus 902.
  • the communication manager 932 includes a determination component 940 that is configured to receive a radio access network (RAN) timing schedule for at least one primary node and at least one secondary node, the RAN timing schedule including a primary node connection time and a secondary node connection time, e.g., as described in connection with step 706 above.
  • Determination component 940 can also be configured to establish a connection, via a medium access control (MAC) layer, to the at least one primary node at the primary node connection time, the connection to the at least one primary node being based on the RAN timing schedule, e.g., as described in connection with step 712 above.
  • MAC medium access control
  • Determination component 940 can also be configured to establish a connection, via the MAC layer, to the at least one secondary node at the secondary node connection time, the connection to the at least one secondary node being based on the RAN timing schedule, e.g., as described in connection with step 716 above.
  • the apparatus may include additional components that perform each of the blocks of the algorithm in the aforementioned flowcharts of FIGs. 6 and 7. As such, each block in the aforementioned flowcharts of FIGs. 6 and 7 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.
  • the apparatus 902 includes means for receiving a radio access network (RAN) timing schedule for at least one primary node and at least one secondary node, the RAN timing schedule including a primary node connection time and a secondary node connection time.
  • the apparatus 902 can also include means for establishing a connection, via a medium access control (MAC) layer, to the at least one primary node at the primary node connection time, the connection to the at least one primary node being based on the RAN timing schedule.
  • the apparatus 902 can also include means for establishing a connection, via the MAC layer, to the at least one secondary node at the secondary node connection time, the connection to the at least one secondary node being based on the RAN timing schedule.
  • RAN radio access network
  • the aforementioned means may be one or more of the aforementioned components of the apparatus 902 configured to perform the functions recited by the aforementioned means.
  • the apparatus 902 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.
  • FIG. 10 is a diagram 1000 illustrating an example of a hardware implementation for an apparatus 1002.
  • the apparatus 1002 is a base station and includes a baseband unit 1004.
  • the baseband unit 1004 may communicate through a cellular RF transceiver with the UE 104.
  • the baseband unit 1004 may include a computer-readable medium /memory.
  • the baseband unit 1004 is responsible for general processing, including the execution of software stored on the computer-readable medium /memory.
  • the software when executed by the baseband unit 1004, causes the baseband unit 1004 to perform the various functions described supra.
  • the computer-readable medium /memory may also be used for storing data that is manipulated by the baseband unit 1004 when executing software.
  • the baseband unit 1004 further includes a reception component 1030, a communication manager 1032, and a transmission component 1034.
  • the communication manager 1032 includes the one or more illustrated components.
  • the components within the communication manager 1032 may be stored in the computer-readable medium /memory and/or configured as hardware within the baseband unit 1004.
  • the baseband unit 1004 may be a component of the BS 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.
  • the communication manager 1032 includes a determination component 1040 that is configured to determine a radio access network (RAN) timing schedule for at least one user equipment (UE) , the RAN timing schedule including a primary node connection time and a secondary node connection time, e.g., as described in connection with step 806 above. Determination component 1040 can also be configured to transmit the RAN timing schedule to the at least one UE, e.g., as described in connection with step 808 above.
  • RAN radio access network
  • UE user equipment
  • Determination component 1040 can also be configured to establish a connection, via a medium access control (MAC) layer, to the at least one UE at the primary node connection time or the secondary node connection time, the connection to the at least one UE being based on the RAN timing schedule, e.g., as described in connection with step 812 above.
  • MAC medium access control
  • the apparatus may include additional components that perform each of the blocks of the algorithm in the aforementioned flowcharts of FIGs. 6 and 8. As such, each block in the aforementioned flowcharts of FIGs. 6 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.
  • the apparatus 1002 includes means for determining a radio access network (RAN) timing schedule for at least one user equipment (UE) , the RAN timing schedule including a primary node connection time and a secondary node connection time.
  • the apparatus 1002 can also include means for transmitting the RAN timing schedule to the at least one UE.
  • the apparatus 1002 can also include means for establishing a connection, via a medium access control (MAC) layer, to the at least one UE at the primary node connection time or the secondary node connection time, the connection to the at least one UE being based on the RAN timing schedule.
  • the aforementioned means may be one or more of the aforementioned components of the apparatus 1002 configured to perform the functions recited by the aforementioned means.
  • the apparatus 1002 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.
  • 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)
  • Computer Networks & Wireless Communication (AREA)
  • Signal Processing (AREA)
  • Mobile Radio Communication Systems (AREA)

Abstract

La présente divulgation concerne des procédés et des dispositifs destinés à une communications sans fil incluant un appareil, par ex. un UE et/ou un nœud ou une station de base. Selon un aspect de l'invention, l'appareil peut recevoir un calendrier de synchronisation de RAN pour au moins un nœud primaire et au moins un nœud secondaire, le calendrier de synchronisation de RAN comprenant un temps de connexion de nœuds primaires et un temps de connexion de nœuds secondaires. L'appareil peut également établir une connexion, par le biais d'une couche de MAC, à l'au moins un nœud primaire au temps de connexion de nœuds primaires, la connexion à l'au moins un nœud primaire étant basée sur le calendrier de synchronisation de RAN. L'appareil peut également établir une connexion, par le biais de la couche de MAC, à l'au moins un nœud secondaire au temps de connexion de nœuds secondaires, la connexion à l'au moins un nœud secondaire étant basée sur le calendrier de synchronisation de RAN.
PCT/CN2020/114714 2020-09-11 2020-09-11 Procédés et appareils d'améliorations de fiabilité de réseaux de communication machine massive (mmtc) WO2022052028A1 (fr)

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Citations (3)

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WO2016173426A1 (fr) * 2015-04-27 2016-11-03 厦门纵行信息科技有限公司 Procédé et dispositif de réseautage pour réseau
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WO2016173426A1 (fr) * 2015-04-27 2016-11-03 厦门纵行信息科技有限公司 Procédé et dispositif de réseautage pour réseau
CN110945946A (zh) * 2017-07-21 2020-03-31 Lg电子株式会社 在无线通信系统中基于lte和nr的信号收发方法及其装置
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