WO2021217042A1 - Assistance à la libération pendant une émission de données précoce - Google Patents

Assistance à la libération pendant une émission de données précoce Download PDF

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Publication number
WO2021217042A1
WO2021217042A1 PCT/US2021/028908 US2021028908W WO2021217042A1 WO 2021217042 A1 WO2021217042 A1 WO 2021217042A1 US 2021028908 W US2021028908 W US 2021028908W WO 2021217042 A1 WO2021217042 A1 WO 2021217042A1
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WO
WIPO (PCT)
Prior art keywords
base station
edt
transmitting
rai
control channel
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PCT/US2021/028908
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English (en)
Inventor
Raghuveer Ramakrishna Srinivas TARIMALA
Liangchi Hsu
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Qualcomm Incorporated
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Publication date
Application filed by Qualcomm Incorporated filed Critical Qualcomm Incorporated
Publication of WO2021217042A1 publication Critical patent/WO2021217042A1/fr

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

Definitions

  • the present disclosure relates generally to communication systems, and more particularly in some examples, to using a release assistance indication to end a random access process at a user equipment after early data transmission has been completed and before the time for receiving a conventional release from a base station.
  • 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 (3 GPP) to meet new requirements associated with latency, reliability, security, scalability (e.g., with Internet of things (IoT)), and other requirements.
  • 3 GPP 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
  • Some aspects of 5G NR may be based on the 4G Long Term Evolution (LTE) standard.
  • LTE Long Term Evolution
  • the technology disclosed herein includes a method of wireless communication during a random access (RA) procedure by a user equipment (UE) of a access network, comprising transmitting both uplink application data and a release assistance indication (RAI) under early data transmission (EDT) in an RA message 3 (MSG3) to a base station of the access network, the RAI indicating that completion of the EDT requires no further uplink application data transmission.
  • the method further includes monitoring a downlink control channel of the base station upon the transmitting.
  • the method further includes from the base station, in response to transmitting the RAI and prior to a latest time for the base station to transmit an RA message 4 (MSG4) specified for the network, an RA MSG4 comprising an instruction for the UE to end monitoring of the downlink control channel. Additionally, the method further includes ending, in response to receiving the instruction, continuous monitoring of the downlink control channel.
  • MSG4 RA message 4
  • Another example implementation includes an apparatus for wireless communication during a random access (RA) procedure by a user equipment (UE) of an access network, comprising a memory and a processor in communication with the memory.
  • the processor is configured to transmit both uplink application data and a release assistance indication (RAI) under early data transmission (EDT) in an RA message 3 (MSG3) to a base station of the access network, the RAI indicating that completion of the EDT requires no further uplink application data transmission.
  • the processor is further configured to monitor a downlink control channel of the base station upon the transmitting.
  • the processor further configured to receive, from the base station, in response to transmitting the RAI and prior to a latest time for the base station to transmit an RA message 4 (MSG4) specified for the network, an RA MSG4 comprising an instruction for the UE to end monitoring of the downlink control channel. Additionally, the processor further configured to end, in response to receiving the instruction, continuous monitoring of the downlink control channel.
  • MSG4 RA message 4
  • Another example implementation includes an apparatus for wireless communication during a random access (RA) procedure by a user equipment (UE) of a access network, comprising means for transmitting both uplink application data and a release assistance indication (RAI) under early data transmission (EDT) in an RA message 3 (MSG3) to a base station of the access network, the RAI indicating that completion of the EDT requires no further uplink application data transmission.
  • the apparatus further includes means for monitoring a downlink control channel of the base station upon the transmitting.
  • the apparatus further includes means for receiving, from the base station, in response to transmitting the RAI and prior to a latest time for the base station to transmit an RA message 4 (MSG4) specified for the network, an RA MSG4 instructing the UE to end monitoring of the downlink control channel. Additionally, the apparatus further includes means for ending, in response to receiving the instruction, continuous monitoring of the downlink control channel.
  • MSG4 RA message 4
  • Another example implementation includes a computer-readable medium comprising stored instructions for wireless communication during a random access (RA) procedure by a user equipment (UE) of a access network, executable by a processor to transmit both uplink application data and a release assistance indication (RAI) under early data transmission (EDT) in an RA message 3 (MSG3) to a base station of the access network, the RAI indicating that completion of the EDT requires no further uplink application data transmission.
  • the instructions are further executable to monitor a downlink control channel of the base station upon the transmitting.
  • the instructions are further executable to receive, from the base station, in response to transmitting the RAI and prior to a latest time for the base station to transmit an RA message 4 (MSG4) specified for the network, an RA MSG4 instructing the UE to end monitoring of the downlink control channel. Additionally, the instructions are further executable to end, in response to receiving the instruction, continuous monitoring of the downlink control channel.
  • MSG4 RA message 4
  • 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 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 a base station and user equipment (UE) in an access network, in accordance with examples of the technology disclosed herein.
  • UE user equipment
  • FIG. 4 is a diagram illustrating data transfer between a UE, a base station, and a core network for mobile originated (MO) data transfer in wireless communication.
  • FIG. 5 is a diagram illustrating data transfer between a UE, a base station, and a core network for mobile originated data (MO) transfer in wireless communication.
  • MO mobile originated data
  • FIG. 6 is a diagram illustrating data transfer between a UE, a base station, and a core network for mobile originated (MO) data transfer in wireless communication, in accordance with examples of the technology disclosed herein.
  • FIG. 7 is a flowchart of methods of wireless communication in accordance with examples of the technology disclosed herein.
  • FIG. 8 is a block diagram of a UE, in accordance with examples of the technology disclosed herein.
  • FIG. 9 is a flowchart of methods of wireless communication in accordance with examples of the technology disclosed herein.
  • FIG. 10 is a block diagram of a core network, in accordance with examples of the technology disclosed herein. DETAILED DESCRIPTION
  • Cellular IoT includes a set of 3GPP standards for low power IoT devices as UEs.
  • UEs that are Category M (Cat-M) and Category NarrowBand IoT (NB-IoT) can use the CIoT protocols described in the 3GPP standards.
  • Two types of CIoT are described in the 3GPP standards: Control Plane CIoT (CP-CIoT), and User Plane CIoT (UP-CIoT).
  • CP-CIoT may be applicable to NB-IoTs UEs only; while UP-CIoT may be applicable to both NB-IoT UEs and Cat-M UEs.
  • Both NB-IoT UEs and Cat-M UEs are characterized by low power, low cost, and short and infrequent data transfer (both uplink and downlink) in comparison to UEs such as smartphones.
  • One example application for CIoT is sensor data collection - such as utility meter reading.
  • UEs connect to base stations as part of an access networks (described in greater detail below).
  • the initial connection between a UE and the base station includes a random access (RA) procedure at lower levels of the protocol stack characterizing the wireless communication system in accordance with a Radio Resource Control (RRC) protocol to establish an RRC connection.
  • RA random access
  • RRC Radio Resource Control
  • EDT Early Data Transmission
  • a UE such as an NB-IoT UE or a Cat-M UE
  • EDT can be advantageous because the cost (e.g., in power, bandwidth, and latency) to set up an RRC channel often does not justify the short and infrequent data transfer - especially for NB-IoT UEs and Cat-M UEs.
  • EDT there is a cost to the UE in power, latency, and bandwidth to monitor a downlink control channel (typically continuously) between the UE and the base station during the RA procedure.
  • the UE transmits both uplink application data and a release assistance indication (RAI) under EDT in an RA message 3 (MSG3) to a base station of the access network.
  • RAI indicates that completion of the EDT requires no further uplink or downlink application data transmission.
  • the UE monitors a downlink control channel of the base station upon the transmitting.
  • the UE then receives, from the base station, in response to transmitting the RAI and prior to a latest time for the base station to transmit an RA message 4 (MSG4) specified for the network, an RA MSG4 instructing the UE to end monitoring of the downlink control channel.
  • the UE ends, in response to receiving the instruction, continuous monitoring of the downlink control channel.
  • 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
  • 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., SI interface).
  • the base stations 102 configured for 5G R may interface with core network 190 through second backhaul links 186.
  • UMTS Universal Mobile Telecommunications System
  • 5G R 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.
  • 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, second and third backhaul links 132, 184 and 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
  • 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.
  • MIMO multiple-input and multiple-output
  • a given set of beams can carry the multiple copies of a Physical Downlink Shared Channel (PDSCH), described further infra , on the DL and can carry multiple copies of a Physical Uplink Control Channel (PUCCH), also described further infra , on the UL.
  • PDSCH Physical Downlink Shared Channel
  • PUCCH Physical Uplink Control Channel
  • the communication links may be through one or more carriers.
  • the base stations 102 / UEs 104 may use spectrum up to 7 MHz (e.g., 5, 10, 15, 20, 100, 400, etc. MHz) bandwidth per carrier allocated in a carrier aggregation of up to a total of Yx MHz (x component carriers) used for transmission in each direction.
  • the carriers may or may not be adjacent to each other. Allocation of carriers may be asymmetric with respect to DL and UL (e.g., more or fewer carriers may be allocated for DL than for UL).
  • 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).
  • PCell primary cell
  • SCell secondary cell
  • 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).
  • 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).
  • 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
  • the STAs 152 / AP 150 may perform a clear channel assessment (CCA) prior to communicating in order to determine whether the channel is available.
  • CCA clear channel assessment
  • the small cell 102' may operate in a licensed and/or an unlicensed frequency spectrum. When operating in an unlicensed frequency spectrum, the small cell 102' may employ NR and use the same 5 GHz unlicensed frequency spectrum as used by the Wi-Fi AP 150.
  • the small cell 102', employing NR in an unlicensed frequency spectrum may boost coverage to and/or increase capacity of the access network.
  • a base station 102 may include and/or be referred to as an eNB, gNodeB (gNB), or another type of base station.
  • Some base stations, 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 base station Extremely high frequency (EHF) is part of the RF in the electromagnetic spectrum.
  • EHF Extremely high frequency
  • EHF has a range of 30 GHz to 300 GHz and a wavelength between 1 millimeter and 10 millimeters. Radio waves in the band may be referred to as a millimeter wave. Near mmW may extend down to a frequency of 3 GHz with a wavelength of 100 millimeters.
  • the super high frequency (SHF) band extends between 3 GHz and 30 GHz, also referred to as centimeter wave. Communications using the mmW / near mmW radio frequency band (e.g., 3 GHz - 300 GHz) has extremely high path loss and a short range - making mmW transmissions susceptible to blocking and attenuation resulting in, e.g., unsuccessfully decoded data.
  • the mmW base station 180 may utilize beamforming 182 with the UE 104/184 to compensate for the extremely high path loss and short range.
  • the base station 180 and the UE 104 may each include a plurality of antennas, such as antenna elements, antenna panels, and/or antenna arrays to facilitate the beamforming.
  • the base station 180 may transmit a beamformed signal to the UE 104/184 in one or more transmit directions 182'.
  • the UE 104/184 may receive the beamformed signal from the base station 180 in one or more receive directions 182".
  • the UE 104/184 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 104/184 may perform beam training to determine the best receive and transmit directions for each of the base station 180 /UE 104/184.
  • 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 104/184 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 PS Streaming Service, and/or other IP services.
  • IMS IP Multimedia Subsystem
  • the base station may include and/or be referred to as a gNB, Node B, eNB, an access point, a base transceiver station, a radio base station, a radio transceiver, a transceiver function, a basic service set (BSS), an extended service set (ESS), a transmit reception point (TRP), or some other suitable terminology.
  • the base station 102 provides an access point to the EPC 160 or core network 190 for a UE 104.
  • Examples of UEs 104 include a cellular phone, a smart phone, a session initiation protocol (SIP) phone, a laptop, a personal digital assistant (PDA), a satellite radio, a global positioning system, a multimedia device, a video device, a digital audio player (e.g., MP3 player), a camera, a game console, a tablet, a smart device, a wearable device, a vehicle, an electric meter, a gas pump, a large or small kitchen appliance, a healthcare device, an implant, a sensor/actuator, a display, or any other similar functioning device.
  • SIP session initiation protocol
  • PDA personal digital assistant
  • Some of the UEs 104 may be referred to as IoT devices (e.g., parking meter, gas pump, toaster, vehicles, heart monitor, etc.).
  • IoT devices e.g., parking meter, gas pump, toaster, vehicles, heart monitor, etc.
  • some devices 188 such a utility meters, parking meters, appliances, remote sensors, etc. can be characterized by infrequent and small data packet communications - especially in relation to smart phones.
  • 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 (such as UE 188) is configured to transmit during an RA procedure, both uplink application data and a release assistance indication (RAI) under EDT in an RA message 3 (MSG3) to a base station 102 of the access network.
  • the RAI indicates that completion of the EDT requires no further uplink or downlink application data transmission.
  • the UE 104 monitors a downlink control channel of the base station 102 upon the transmitting. Additionally, the UE 104 receives, from the base station 102, in response to transmitting the RAI and prior to a latest time for the base station to transmit an RA message 4 (MSG4) specified for the network, an RA MSG4 instructing the UE 104 to end monitoring of the downlink control channel.
  • the UE 104 ends, in response to receiving the instruction, continuous monitoring of the downlink control channel.
  • the UE 104 can use UE RAI EDT Component 142 for performing this transmitting, monitoring, receiving, and ending.
  • the core network (such as core network 190 or EPC 160) is configured to receive, during an RA procedure of the UE 104 of a access network in communication with the base station 102, both uplink application data of an application executing on the UE 104 and a release assistance indication (RAI) under early data transmission (EDT) via an RA message 3 (MSG3) received by the base station 102.
  • the RAI indicates that completion of the EDT requires no further uplink or downlink application data transmission.
  • the core network in response to receiving the RAI, directs the base station 102 to instruct the UE 104, prior to a latest time for the base station to transmit an RA message 4 (MSG4) specified for the access network, to end monitoring of the downlink control channel.
  • the core network can use core network RAI EDT Component 144 for performing the functions described in this paragraph.
  • FIG. 2A is a diagram 200 illustrating an example of a first subframe within a 5G/NR frame structure.
  • FIG. 2B is a diagram 230 illustrating an example of DL channels within a 5G/NR subframe.
  • FIG. 2C is a diagram 250 illustrating an example of a second subframe within a 5G/NR frame structure.
  • FIG. 2D is a diagram 280 illustrating an example of UL channels within a 5G/NR subframe.
  • the 5G/NR frame structure may be FDD in which for a particular set of subcarriers (carrier system bandwidth), subframes within the set of subcarriers are dedicated for either DL or UL, or may be TDD in which for a particular set of subcarriers (carrier system bandwidth), subframes within the set of subcarriers are dedicated for both DL and UL.
  • the 5G/NR frame structure is assumed to be TDD, with subframe 4 being configured with slot format 28 (with mostly DL), where D is DL, U is UL, and X is flexible for use between DL/UL, and subframe 3 being configured with slot format 34 (with mostly UL).
  • 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). Note that the description infra applies also to a 5G/NR frame structure that is TDD.
  • DCI DL control information
  • RRC radio resource control
  • 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 m 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 m, there are 14 symbols/slot and 2 m slots/subframe.
  • the subcarrier spacing and symbol length/duration are a function of the numerology.
  • the subcarrier spacing may be equal to 2 m * 15 kHz, where m is the numerology 0 to 5.
  • 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 ps.
  • 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 lOOx 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 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 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 SDUs from TBs, scheduling information reporting, error correction
  • 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 de-interleaved 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 header compression
  • 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 FLARQ operations.
  • the UE 350 is configured to transmit during an RA procedure, both uplink application data and a release assistance indication (RAI) under EDT in an RA message 3 (MSG3) to a base station 310 of the access network.
  • the RAI indicates that completion of the EDT requires no further uplink or downlink application data transmission.
  • the UE 350 monitors a downlink control channel of the base station 310 upon the transmitting.
  • the UE 350 receives, from the base station 102, in response to transmitting the RAI and prior to a latest time for the base station to transmit an RA message 4 (MSG4) specified for the network, an RA MSG4 instructing the UE 350 to end monitoring of the downlink control channel.
  • the UE 350 ends, in response to receiving the instruction, continuous monitoring of the downlink control channel.
  • the UE 350 can use UE RAI EDT Component 142 for performing this transmitting, monitoring, receiving, and ending
  • FIG. 4 a diagram illustrating data transfer between a UE 102, a base station 104, and a core network 190 for mobile originated (MO) data transfer in wireless communication is shown.
  • UEs 104 connect to base stations 102 as part of an access networks.
  • the initial connection between a UE 104 and the base station 102 includes a random access (RA) procedure at lower levels of the protocol stack characterizing the wireless communication system in accordance with a Radio Resource Control (RRC) protocol to establish an RRC connection.
  • RA random access
  • RRC Radio Resource Control
  • the RRC protocol includes a series of messages e.g., MSG1 through MSG 7 in FIG. 4.
  • the UE 104 contends with other UEs in transmitting a MSG1 Random Access Preamble to the eNB base station 102 until the base station 102 replies with a MSG2 Random Access Response allocating resources for the UE 104 to specify a MSG3 Radio Resource Control (RRC) Connection Request.
  • RRC Radio Resource Control
  • the UE 104 monitors a downlink control channel from the base station 102. In typical scenarios, this monitoring is continuous.
  • the base station 102 responds to MSG3 with a MSG4 RRC Connection Setup with information for the UE to configure for RRC Connection.
  • the UE confirms that it has configured for the specified RRC connection and begins transmitting application data, e.g., Non-Access Strata (NAS) protocol data units (PDUs) using MSG5 to the base station 102.
  • application data e.g., Non-Access Strata (NAS) protocol data units (PDUs)
  • the base station forwards NAS PDUs to the core network 190 over the RRC connection.
  • the core network 190 (or the EPC 160), as described in connection with FIG. 1, connects the UE 104 to various applications, and can send downlink NAS PDUs from such applications through the base station 102 to the UE 104 using one or more MSG6.
  • the RRC connection Upon completion of the data transfer from/to the UE 104, the RRC connection is released using MSG7 - which allows the UE to end monitoring of the downlink control channel.
  • FIG. 5 a diagram illustrating EDT data transfer between a UE 102, a base station 104, and a core network 190 for mobile originated (MO) data transfer in wireless communication is shown.
  • the RRC protocol under EDT includes a series of messages e.g., MSG1 through MSG 4 in FIG. 5 - each message with similar function as described in connection with FIG. 4.
  • the UE 104 contends with other UEs in transmitting a MSG1 Random Access Preamble to the eNB base station 102 until the base station 102 replies with a MSG2 Random Access Response allocating resources for the UE 104 to specify a MSG3 Radio Resource Control (RRC) Connection Request.
  • RRC Radio Resource Control
  • MSG3 includes a small amount of application data (typically NAS data).
  • the base station 102 transfers the application data to the core network 190, e.g., so that the core network can transfer the application data to an application server (not shown in FIG. 5).
  • the UE 104 monitors (typically continuously) a downlink control channel from the base station 102, in part in anticipation of MSG4 (which can contain a termination of the RA procedure along with (optionally) NAS PDUs from the application server via the core network 190.
  • typical application servers are located outside the system shown in FIG. 1 (where those outside systems are shown as “IP Services 176” and “IP Services 197”).
  • the base station 102 may wait on the core network 190, which in turn may wait on application servers outside the Public Land Mobile Network (PLMN) for possible downlink application data intended for the UE 104.
  • PLMN Public Land Mobile Network
  • network specifications allow for as long as sixty (60) seconds for Cat-M UEs and one hundred twenty (120) seconds for NB- IoT UEs before the base station times out and sends a MSG4 terminating the RA procedure.
  • a UE expends resources (power, bandwidth, and latency) continuing to monitor a downlink control channel from the base station while waiting between MSG3 and MSG4. Note that if the EDT of FIG. 5 is successful, the UE does not move to a fully connected RRC state.
  • a UE would typically use the EDT procedure when there is a sufficiently small, single data packet that does not have more than 1 data packet in response from the application server.
  • FIG. 6 a diagram illustrating RAI EDT data transfer between a UE, a base station, a core network, and an application server for mobile originated (MO) data transfer in wireless communication is shown, in accordance with examples of the technology disclosed herein.
  • FIG. 6 describes a continuing example where the UE is a NB-IoT enabled parking meter 188 within the coverage of base station 189 using EDT in CP-CIoT mode.
  • Base station 189 is in communication with core network 190 over backhaul 186.
  • Core network 190 has access to a parking meter server as part of IP services 197.
  • Parking meter 188 has short (less than 1000 bits) and infrequent (typically less an one per hour) uplink application data to pass to the application server 197 - and even shorter and less frequent downlink application data to receive from the application server 197.
  • a flowchart of methods 700 of wireless communication is shown, in accordance with examples of the technology disclosed herein.
  • the UE transmits both uplink application data and a release assistance indication (RAI) under early data transmission (EDT) in an RA message 3 (MSG3) to a base station of the access network - Block 702.
  • RAI indicates that completion of the EDT requires no further uplink or downlink application data transmission.
  • parking meter NB-IoT UE 188 has a small amount or UE- originated data, e.g., meter ID, desired parking duration, and payment account information from a parker.
  • the UE 188 initiates an RA process with eNB base station 189 using MSG1 RandomAccessPreamble. Absent collisions from other UEs attempting to connect to the base station 189, the base station 189 responds with MSG2 RandomAccessResponse.
  • the UE 188 Upon receiving MSG2, the UE 188 transmits both the application data (meter ID, parking duration, and payment account information) (as an NAS PDU) and an RAI to the base station as part of a MSG3 EDT RRCEarlyDataRequest.
  • the RAI indicates that completion of EDT requires no further uplink application data transmission.
  • UE 350 for wireless communication is shown, in accordance with examples of the technology disclosed herein.
  • UE 350 includes, in addition to a processor 359 and memory 360, a UE RAI EDT component 142 as described in conjunction with FIG. 3 above.
  • UE RAI EDT component 142 includes transmitting component 142a.
  • the transmitting component 142a transmits both uplink application data and a release assistance indication (RAI) under early data transmission (EDT) in an RA message 3 (MSG3) to a base station of the access network.
  • the transmitting component 142a may provide means for transmitting both uplink application data and a release assistance indication (RAI) under early data transmission (EDT) in an RA message 3 (MSG3) to a base station of the access network.
  • RAI release assistance indication
  • the UE monitors, during the RA procedure, a downlink control channel of the base station upon the transmitting - Block 704.
  • the UE 188 monitors NB-IoT PDCCH for downlink control information (DCI) from the base station 189.
  • the base station 189 transmits the NAS PDU containing the application information to the core network 190.
  • the core network routes the application information to the parking application server 197.
  • UE RAI EDT component 142 includes monitoring component 142b.
  • the monitoring component 142b monitors, during the RA procedure, a downlink control channel of the base station upon the transmitting. Accordingly, the monitoring component 142b may provide means for monitoring, during the RA procedure, a downlink control channel of the base station upon the transmitting.
  • the UE receives, from the base station, in response to transmitting the RAI and prior to a latest time for the base station to transmit an RA message 4 (MSG4) specified for the network, an RA MSG4 comprising an instruction for the UE to end monitoring of the downlink control channel - Block 706.
  • MSG4 RA message 4
  • the UE 188 while monitoring the NB-IoT PDCCH in downlink from the base station 189 receives an RRCEarlyDataComplete MSG4 including confirmation that a full RRC will not be set up, the EDT is complete, and that the UE can end monitoring NB-IoT PDCCH for DCI.
  • the application server 197 after receiving the application data, has other NAS PDU application data to pass to the UE 188 in downlink, e.g., that the payment account information was approved.
  • the application server sends the downlink application data through the core network 190 to the base station 189 for transmission to the UE 188 as part of the RRCEarlyDataComplete MSG4.
  • UE RAI EDT component 142 includes receiving component 142c.
  • the receiving component 142c receives, from the base station during the RA procedure, in response to transmitting the RAI and prior to a latest time for the base station to transmit an RA message 4 (MSG4) specified for the network, an RA MSG4 instructing the UE to end monitoring of the downlink control channel.
  • MSG4 RA message 4
  • the receiving component 142c may provide means for receiving, from the base station during the RA procedure, in response to transmitting the RAI and prior to a latest time for the base station to transmit an RA message 4 (MSG4) specified for the network, an RA MSG4 instructing the UE to end monitoring of the downlink control channel.
  • MSG4 RA message 4
  • the UE ends, during the RA procedure and in response to receiving the instruction, monitoring of the downlink control channel - Block 708.
  • the UE 188 ends monitoring of the NPCCH, thereby saving resources that would have been spent waiting for the access network to reach the latest time for the base station 189 to transmit a MSG4.
  • UE RAI EDT component 142 includes ending component 142d.
  • the ending component 142d ends, during the RA procedure and in response to receiving the instruction, monitoring of the downlink control channel. Accordingly, the ending component 142d may provide means for ending, during the RA procedure and in response to receiving the instruction, monitoring of the downlink control channel.
  • a flowchart of methods 900 of wireless communication is shown, in accordance with examples of the technology disclosed herein.
  • the core network in communication with a base station of the access network, receives both uplink application data of an application executing on the UE and a release assistance indication (RAI) under early data transmission (EDT) via an RA message 3 (MSG3) received by the base station - Block 902.
  • the RAI indicates that completion of the EDT requires no further uplink or downlink application data transmission.
  • the core network 190 in communication with the base station 189 receives the uplink application data as an NAS PDU and the RAI under EDT via the base station 189 receiving MSG3 RRCEarlyDataRequest.
  • Core network 160/190 includes, in addition to a processor 1059 and memory 1060, a Core Network RAI EDT component 144.
  • Core Network RAI EDT component 144 includes receiving component 144a.
  • the receiving component 144a in communication with a base station of the access network, receives both uplink application data of an application executing on the UE and a release assistance indication (RAI) under early data transmission (EDT) via an RA message 3 (MSG3) received by the base station.
  • the transmitting component 142a may provide means for receiving both uplink application data of an application executing on the UE and a release assistance indication (RAI) under early data transmission (EDT) via an RA message 3 (MSG3) received by the base station.
  • the core network directs, during the RA procedure and in response to receiving the RAI, the base station to instruct the UE, prior to a latest time for the base station to transmit an RA message 4 (MSG4) specified for the network, an RA MSG4 instructing the UE to end monitoring of a downlink control channel - Block 904.
  • the core network 190 upon receiving the RAI directs the base station 189 to instruct the UE 188 to end the RA process, thereby ending monitoring of the NB-IoT PDCCH downlink for DCI. This saves resources at the UE 188 over the conventional approach.
  • the directing is independent of the core network receiving downlink data from an application server of the application intended for the UE.
  • the MSG4 includes downlink data from an application server via the core network intended for the UE. Such data is provided by the application server to the core network (and then passed to the base station) in a timely fashion to allow the base station to include this downlink application data as an NAS PDU in the MSG4 RRCEarlyDataComplete message.
  • Core Network RAI EDT component 144 includes directing component 144b.
  • the directing component 144b directs, during the RA procedure and in response to receiving the RAI, the base station to instruct the UE, prior to a latest time for the base station to transmit an RA message 4 (MSG4) specified for the network, an RA MSG4 instructing the UE to end monitoring of the downlink control channel.
  • MSG4 RA message 4
  • the directing component 144b may provide means for directing, during the RA procedure and in response to receiving the RAI, the base station to instruct the UE, prior to a latest time for the base station to transmit an RA message 4 (MSG4) specified for the network, an RA MSG4 instructing the UE to end monitoring of the downlink control channel.
  • MSG4 RA message 4
  • the UE is a NB-IoT enabled parking meter 188 (with only short and infrequent NAS application data transfer requirements) using CP-CIoT mode EDT, base station 189, core network 190, and application server 197
  • other UEs including CAT-M UEs
  • other modes e.g., UP-CIoT for NB-IoT UEs
  • EDT MSG3 is RRCConnectionResumeRequest
  • EDT MSG4 is RRCConnectionSuspend.
  • IoT applications on the UE side would provide the RAI info if the UE knows that there will be no more originating data and the response from the application server would be none or at max a single data packet.
  • IoT UE will use EDT procedure only if RAI is available. If RAI is not available, to avoid the additional power drain due to EDT, EDT will be used by the UE to send the qualified mobile originated (MO) data only when the eNB does not support connected mode discontinuous reception (C-DRX).
  • the base station can act on the RAI rather than requiring the core network to direct the base station.
  • Example 1 is any one of a method, apparatus, computer readable media, apparatus comprising means for executing feature, of wireless communication including during a random access (RA) procedure by a user equipment (UE) of a access network: transmitting both uplink application data and a release assistance indication (RAI) under early data transmission (EDT) in an RA message 3 (MSG3) to a base station of the access network, the RAI indicating that completion of the EDT requires no further uplink application data transmission; monitoring a downlink control channel of the base station upon the transmitting; receiving, from the base station, in response to transmitting the RAI and prior to a latest time for the base station to transmit an RA message 4 (MSG4) specified for the network, an RA MSG4 instructing the UE to end monitoring of the downlink control channel; and ending, in response to receiving the instruction, monitoring of the downlink control channel.
  • RA random access
  • UE user equipment
  • MSG3 early data transmission
  • Example 2 further includes wherein the UE is a narrowband Internet of things (NB IoT) device.
  • NB IoT narrowband Internet of things
  • any of Example 1-2 includes the EDT being under at least one of control plane cellular IoT (CP-CIoT) or user plane cellular IoT (UP-CIoT).
  • CP-CIoT control plane cellular IoT
  • UP-CIoT user plane cellular IoT
  • Example 4 any of Examples 1-3 further includes wherein the UE is a CAT -Ml device.
  • Example 5 any of Examples 1-4 includes the EDT being under user plane - cellular Internet of things (UP-CIoT).
  • UP-CIoT user plane - cellular Internet of things
  • Example 6 any of Examples 1-4 further includes, prior to and as a condition of transmitting, determining that the characteristic of the application data and the base station are such that EDT is available.
  • Example 7 and of Examples 1-6 further includes, prior to and as a condition of transmitting, determining that the base station does not support connected mode discontinuous reception (C-DRX).
  • C-DRX connected mode discontinuous reception
  • an apparatus for wireless communication includes a memory and at least one processor coupled to the memory.
  • the memory includes instructions executable by the at least one processor to cause the apparatus to perform the method of any one or more of Examples 1-6.
  • an apparatus for wireless communications includes means for transmitting, during a random access (RA) procedure and by a user equipment (UE) of a access network, both uplink application data and a release assistance indication (RAI) under early data transmission (EDT) in an RA message 3 (MSG3) to a base station of the access network, the RAI indicating that completion of the EDT requires no further uplink application data transmission; means for monitoring, during the RA procedure and by the UE, a downlink control channel of the base station upon the transmitting; means for receiving, during the RA procedure and by the UE from the base station, in response to transmitting the RAI and prior to a latest time for the base station to transmit an RA message 4 (MSG4) specified for the network, an RA MSG4 instructing the UE to end monitoring of the downlink control channel; and
  • RA random access
  • UE user equipment
  • RAI early data transmission
  • Example 11 the apparatus of Example 10 includes wherein the UE is a narrowband Internet of things (NB IoT) device, and the EDT is under at least one of control plane cellular IoT (CP-CIoT) or user plane cellular IoT (UP-CIoT).
  • NB IoT narrowband Internet of things
  • CP-CIoT control plane cellular IoT
  • UP-CIoT user plane cellular IoT
  • Example 12 the apparatus of any of Examples 10 and 11 includes wherein the UE is a CAT -Ml device, and the EDT is under user plane - cellular Internet of things (UP-CIoT).
  • UP-CIoT user plane - cellular Internet of things
  • any of Examples 10-12 further includes means for, prior to and as a condition of transmitting, determining that the characteristic of the application data and the base station are such that EDT is available.
  • Example 14 and of Examples 10-13 further includes means for, prior to and as a condition of transmitting, determining that the base station does not support connected mode discontinuous reception (C-DRX).
  • C-DRX connected mode discontinuous reception
  • a method of wireless communication includes, during a random access (RA) procedure of a user equipment (UE) of a access network: receiving, by a core network in communication with a base station of the access network, both uplink application data of an application executing on the UE and a release assistance indication (RAI) under early data transmission (EDT) via an RA message 3 (MSG3) received by the base station, the RAI indicating that completion of the EDT requires no further uplink application data transmission; and directing, by the core network and in response to receiving the RAI, the base station to instruct the UE, prior a latest time for the base station to transmit an RA message 4 (MSG4) specified for the access network, to end monitoring of the downlink control channel.
  • the method of Example 14 includes wherein the directing is independent of the core network receiving downlink data from an application server of the application intended for the UE.
  • Example 16 the method of any of Examples 14-15 includes wherein the MSG4 includes downlink data from an application server of the application intended for the UE.
  • an apparatus for wireless communication includes a memory and at least one processor coupled to the memory.
  • the memory includes instructions executable by the at least one processor to cause the apparatus to perform the method of any one or more of Examples 14-16.
  • Example 18 a computer-readable medium stores computer executable code. The code when executed by a processor cause the processor to execute the method of any one or more of Examples 14-16.
  • an apparatus for wireless communications includes means for receiving, by a core network in communication with a base station of the access network, both uplink application data of an application executing on the UE and a release assistance indication (RAI) under early data transmission (EDT) via an RA message 3 (MSG3) received by the base station, the RAI indicating that completion of the EDT requires no further uplink application data transmission; and means for directing, by the core network and in response to receiving the RAI, the base station to instruct the UE, prior to a latest time for the base station to transmit an RA message 4 (MSG4) specified for the access network, to end monitoring of the downlink control channel.
  • RAI release assistance indication
  • MSG3 early data transmission
  • MSG4 RA message 4
  • Example 20 the apparatus of Example 19 includes wherein the directing is independent of the core network receiving downlink data from an application server of the application intended for the UE.
  • Example 21 the apparatus of any of Examples 19-20 includes wherein the MSG4 includes downlink data from an application server of the application intended for the UE.
  • 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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  • Mobile Radio Communication Systems (AREA)

Abstract

Dans une communication sans fil pendant une procédure d'accès aléatoire (RA) par un équipement utilisateur (UE) d'un réseau d'accès, l'UE émet à la fois des données d'application de liaison montante et une indication d'assistance de libération (RAI) dans une émission de données précoce (EDT) dans un message RA 3 (MSG3) vers une station de base du réseau d'accès. La RAI indique que l'achèvement de l'EDT ne nécessite aucune émission de données d'application de liaison montante ou de liaison descendante supplémentaire. L'UE surveille un canal de commande de liaison descendante de la station de base lors de l'émission. De plus, l'UE reçoit, en provenance de la station de base, en réponse à l'émission de la RAI et avant un temps le plus récent pour que la station de base émette un message 4 RA (MSG4) spécifié pour le réseau, un MSG4 RA comprenant une instruction pour l'UE pour mettre fin à la surveillance du canal de commande de liaison descendante. L'UE met fin, en réponse à la réception de l'instruction, à la surveillance du canal de commande de liaison descendante.
PCT/US2021/028908 2020-04-24 2021-04-23 Assistance à la libération pendant une émission de données précoce WO2021217042A1 (fr)

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Citations (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2019031427A1 (fr) * 2017-08-10 2019-02-14 京セラ株式会社 Procédé de commande de communication

Patent Citations (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2019031427A1 (fr) * 2017-08-10 2019-02-14 京セラ株式会社 Procédé de commande de communication

Non-Patent Citations (1)

* Cited by examiner, † Cited by third party
Title
ERICSSON: "Data notification for CIoT UEs", vol. RAN WG3, no. Xi'an, China; 20190408 - 20190412, 30 March 2019 (2019-03-30), XP051695199, Retrieved from the Internet <URL:http://www.3gpp.org/ftp/tsg%5Fran/WG3%5FIu/TSGR3%5F103bis/Docs/R3%2D191751%2Ezip> [retrieved on 20190330] *

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