WO2019014805A1 - Appareils et techniques d'améliorations de libération de connexion de commande de ressource radio - Google Patents

Appareils et techniques d'améliorations de libération de connexion de commande de ressource radio Download PDF

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Publication number
WO2019014805A1
WO2019014805A1 PCT/CN2017/093125 CN2017093125W WO2019014805A1 WO 2019014805 A1 WO2019014805 A1 WO 2019014805A1 CN 2017093125 W CN2017093125 W CN 2017093125W WO 2019014805 A1 WO2019014805 A1 WO 2019014805A1
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WIPO (PCT)
Prior art keywords
indication
connection release
control channel
status report
radio
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PCT/CN2017/093125
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English (en)
Inventor
Mungal Singh Dhanda
Alberto Rico Alvarino
Umesh PHUYAL
Xiao Feng Wang
Hao Xu
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Qualcomm Incorporated
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Publication date
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Priority to PCT/CN2017/093125 priority Critical patent/WO2019014805A1/fr
Publication of WO2019014805A1 publication Critical patent/WO2019014805A1/fr

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    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04W—WIRELESS COMMUNICATION NETWORKS
    • H04W76/00—Connection management
    • H04W76/20—Manipulation of established connections
    • H04W76/27—Transitions between radio resource control [RRC] states
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04W—WIRELESS COMMUNICATION NETWORKS
    • H04W76/00—Connection management
    • H04W76/30—Connection release
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
    • Y02D—CLIMATE CHANGE MITIGATION TECHNOLOGIES IN INFORMATION AND COMMUNICATION TECHNOLOGIES [ICT], I.E. INFORMATION AND COMMUNICATION TECHNOLOGIES AIMING AT THE REDUCTION OF THEIR OWN ENERGY USE
    • Y02D30/00—Reducing energy consumption in communication networks
    • Y02D30/70—Reducing energy consumption in communication networks in wireless communication networks

Definitions

  • aspects of the present disclosure generally relate to wireless communication, and more particularly to techniques and apparatuses for radio resource control (RRC) connection release enhancements.
  • RRC radio resource control
  • 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 (e.g., bandwidth, transmit power, and/or the like) .
  • multiple-access technologies include code division multiple access (CDMA) systems, time division multiple access (TDMA) systems, frequency-division multiple access (FDMA) systems, orthogonal frequency-division multiple access (OFDMA) systems, single-carrier frequency-division multiple access (SC-FDMA) systems, time division synchronous code division multiple access (TD-SCDMA) systems, and Long Term Evolution (LTE) .
  • LTE/LTE-Advanced is a set of enhancements to the Universal Mobile Telecommunications System (UMTS) mobile standard promulgated by the Third Generation Partnership Project (3GPP) .
  • UMTS Universal Mobile Telecommunications System
  • a wireless communication network may include a number of base stations (BSs) that can support communication for a number of user equipment (UEs) .
  • a UE may communicate with a BS via the downlink and uplink.
  • the downlink (or forward link) refers to the communication link from the BS to the UE
  • the uplink (or reverse link) refers to the communication link from the UE to the BS.
  • a BS may be referred to as a Node B, a gNB, an access point (AP) , a radio head, a transmit receive point (TRP) , a new radio (NR) BS, a 5G Node B, and/or the like.
  • New radio which may also be referred to as 5G, is a set of enhancements to the LTE mobile standard promulgated by the Third Generation Partnership Project (3GPP) .
  • NR is designed to better support mobile broadband Internet access by improving spectral efficiency, lowering costs, improving services, making use of new spectrum, and better integrating with other open standards using orthogonal frequency division multiplexing (OFDM) with a cyclic prefix (CP) (CP-OFDM) on the downlink (DL) , using CP-OFDM and/or SC-FDM (e.g., also known as discrete Fourier transform spread OFDM (DFT-s-OFDM) ) on the uplink (UL) , as well as supporting beamforming, multiple-input multiple-output (MIMO) antenna technology, and carrier aggregation.
  • OFDM orthogonal frequency division multiplexing
  • SC-FDM e.g., also known as discrete Fourier transform spread OFDM (DFT-s-OFDM)
  • DFT-s-OFDM discrete Fourier transform spread OFDM
  • MIMO multiple-input multiple-output
  • a UE may establish an RRC connection with a BS to transmit information to the BS. For example, when the RRC connection is active, the UE may be in an RRC connected state, and when the RRC connection is released, torn down, or made inactive, the UE may be in an RRC idle state.
  • the UE and the BS may exchange certain messages to set up or release the RRC connection. For example, the UE may transmit an RRC connection setup message and the BS may respond with connection information to set up the RRC connection.
  • the BS may provide a radio link control (RLC) message with or without polling for a status report (in the form of a radio link status report or RLC status report) .
  • RLC radio link control
  • the RLC message may be received in a MAC PDU.
  • the RLC message may contain an RRC connection release indication (e.g., in a downlink shared channel) to cause the UE to transmit radio link status report (if the UE was polled) and to release the RRC connection.
  • the UE may transmit a hybrid automatic repeat request (HARQ) message to confirm reception of the MAC PDU and an RLC status message (e.g., in an uplink shared channel) to indicate successful receipt of the RRC connection release message and may enter RRC idle mode.
  • HARQ hybrid automatic repeat request
  • RLC status message, RLC status PDU, and RLC status report may be used interchangeably.
  • the transmission of multiple messages by the BS and the UE to release an RRC connection may be cumbersome, especially in situations where the RRC connection is established for transmission of a small amount of data.
  • NB-IoT narrowband Internet of Things
  • a small amount of data may be transmitted using each RRC connection, so the overhead associated with releasing the RRC connection may be significant in comparison to the actual data transmitted.
  • Some techniques and apparatuses described herein provide for RRC connection release for a UE using a decreased number of messages and/or using messages that are communicated in a control channel (e.g., an uplink control channel and/or a downlink control channel) .
  • the messages may include an initial transmission and a retransmission of a HARQ message, a physical random access channel (PRACH) preamble of the UE, and/or the like.
  • PRACH physical random access channel
  • the UE may automatically enter RRC idle mode after transmitting the messages, which conserves battery resources of the UE.
  • a method, an apparatus, and a non-transitory computer-readable medium are provided.
  • the method may include receiving, in a downlink control channel, a radio link status report (e.g., indicating that a transmitter of the radio link status report has received all of a set of RLC data blocks) and a radio connection release; and transmitting, in an uplink control channel, an indication of successful receipt of the radio link status report and the radio connection release, wherein the indication is transmitted in the uplink control channel based at least in part on receiving the radio link status report and the radio connection release in the downlink control channel.
  • a radio link status report e.g., indicating that a transmitter of the radio link status report has received all of a set of RLC data blocks
  • the apparatus may include a memory and at least one processor coupled to the memory.
  • the at least one processor may be configured to receive, in a downlink control channel, a radio link status report and a radio connection release; and transmit, in an uplink control channel, an indication of successful receipt of the radio link status report and the radio connection release, wherein the indication is transmitted in the uplink control channel based at least in part on receiving the radio link status report and the radio connection release in the downlink control channel.
  • the apparatus may include means for receiving, in a downlink control channel, a radio link status report and a radio connection release; and means for transmitting, in an uplink control channel, an indication of successful receipt of the radio link status report and the radio connection release, wherein the indication is transmitted in the uplink control channel based at least in part on receiving the radio link status report and the radio connection release in the downlink control channel.
  • the non-transitory computer-readable medium may store one or more instructions for wireless communication, the one or more instructions comprising one or more instructions that, when executed by one or more processors of a user equipment, cause the one or more processors to receive, in a downlink control channel, a radio link status report and a radio connection release; and transmit, in an uplink control channel, an indication of successful receipt of the radio link status report and the radio connection release, wherein the indication is transmitted in the uplink control channel based at least in part on receiving the radio link status report and the radio connection release in the downlink control channel.
  • FIG. 1 is diagram illustrating an example of a wireless communication network.
  • FIG. 2 is a diagram illustrating an example of a base station in communication with a user equipment (UE) in a wireless communication network.
  • UE user equipment
  • FIG. 3 is a diagram illustrating an example of a frame structure in a wireless communication network.
  • FIG. 4 is a diagram illustrating two example subframe formats with the normal cyclic prefix.
  • FIG. 5 is a diagram illustrating an example of RRC connection release enhancements.
  • FIGs. 6A and 6B are diagrams illustrating examples of RRC connection release enhancements.
  • FIG. 7 is a flow chart of a method of wireless communication.
  • FIG. 8 is a conceptual data flow diagram illustrating the data flow between different modules/means/components in an example apparatus.
  • FIG. 9 is a diagram illustrating an example of a hardware implementation for an apparatus employing a processing system.
  • processors include microprocessors, microcontrollers, digital signal processors (DSPs) , 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.
  • DSPs digital signal processors
  • FPGAs field programmable gate arrays
  • PLDs programmable logic devices
  • state machines gated logic, discrete hardware circuits, and other suitable hardware configured to perform the various functionality described throughout this disclosure.
  • One or more 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 modules, applications, software applications, software packages, routines, subroutines, objects, executables, threads of execution, procedures, functions, and/or the like, whether referred to as software, firmware, middleware, microcode, hardware description language, or otherwise.
  • the functions described may be implemented in hardware, software, firmware, 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) , compact disk ROM (CD-ROM) or other optical disk storage, magnetic disk storage or 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
  • CD-ROM compact disk ROM
  • magnetic disk storage magnetic disk storage or other magnetic storage devices
  • aspects may be described herein using terminology commonly associated with 3G and/or 4G wireless technologies, aspects of the present disclosure can be applied in other generation-based communication systems, such as 5G and later, including NR technologies.
  • FIG. 1 is a diagram illustrating a network 100 in which aspects of the present disclosure may be practiced.
  • the network 100 may be an LTE network or some other wireless network, such as a 5G or NR network.
  • Wireless network 100 may include a number of BSs 110 (shown as BS 110a, BS 110b, BS 110c, and BS 110d) and other network entities.
  • a BS is an entity that communicates with user equipment (UEs) and may also be referred to as a base station, a NR BS, a Node B, a gNB, a 5G NB, an access point, a transmit receive point (TRP) , and/or the like.
  • Each BS may provide communication coverage for a particular geographic area.
  • the term “cell” can refer to a coverage area of a BS and/or a BS subsystem serving this coverage area, depending on the context in which the term is used.
  • a BS may provide communication coverage for a macro cell, a pico cell, a femto cell, and/or another type of cell.
  • a macro cell may cover a relatively large geographic area (e.g., several kilometers in radius) and may allow unrestricted access by UEs with service subscription.
  • a pico cell may cover a relatively small geographic area and may allow unrestricted access by UEs with service subscription.
  • a femto cell may cover a relatively small geographic area (e.g., a home) and may allow restricted access by UEs having association with the femto cell (e.g., UEs in a closed subscriber group (CSG) ) .
  • a BS for a macro cell may be referred to as a macro BS.
  • a BS for a pico cell may be referred to as a pico BS.
  • a BS for a femto cell may be referred to as a femto BS or a home BS.
  • a BS 110a may be a macro BS for a macro cell 102a
  • a BS 110b may be a pico BS for a pico cell 102b
  • a BS 110c may be a femto BS for a femto cell 102c.
  • a BS may support one or multiple (e.g., three) cells.
  • eNB base station
  • NR BS NR BS
  • gNB gNode B
  • AP AP
  • node B node B
  • 5G NB 5G NB
  • cell may be used interchangeably herein.
  • a cell may not necessarily be stationary, and the geographic area of the cell may move according to the location of a mobile BS.
  • the BSs may be interconnected to one another and/or to one or more other BSs or network nodes (not shown) in the access network 100 through various types of backhaul interfaces such as a direct physical connection, a virtual network, and/or the like using any suitable transport network.
  • Wireless network 100 may also include relay stations.
  • a relay station is an entity that can receive a transmission of data from an upstream station (e.g., a BS or a UE) and send a transmission of the data to a downstream station (e.g., a UE or a BS) .
  • a relay station may also be a UE that can relay transmissions for other UEs.
  • a relay station 110d may communicate with macro BS 110a and a UE 120d in order to facilitate communication between BS 110a and UE 120d.
  • a relay station may also be referred to as a relay BS, a relay base station, a relay, and/or the like.
  • Wireless network 100 may be a heterogeneous network that includes BSs of different types, e.g., macro BSs, pico BSs, femto BSs, relay BSs, and/or the like. These different types of BSs may have different transmit power levels, different coverage areas, and different impact on interference in wireless network 100.
  • macro BSs may have a high transmit power level (e.g., 5 to 40 Watts) whereas pico BSs, femto BSs, and relay BSs may have lower transmit power levels (e.g., 0.1 to 2 Watts) .
  • a network controller 130 may couple to a set of BSs and may provide coordination and control for these BSs.
  • Network controller 130 may communicate with the BSs via a backhaul.
  • the BSs may also communicate with one another, e.g., directly or indirectly via a wireless or wireline backhaul.
  • UEs 120 may be dispersed throughout wireless network 100, and each UE may be stationary or mobile.
  • a UE may also be referred to as an access terminal, a terminal, a mobile station, a subscriber unit, a station, etc.
  • a UE may be a cellular phone (e.g., a smart phone) , a personal digital assistant (PDA) , a wireless modem, a wireless communication device, a handheld device, a laptop computer, a cordless phone, a wireless local loop (WLL) station, a tablet, a camera, a gaming device, a netbook, a smartbook, an ultrabook, medical device or equipment, biometric sensors/devices, wearable devices (smart watches, smart clothing, smart glasses, smart wrist bands, smart jewelry (e.g., smart ring, smart bracelet) ) , an entertainment device (e.g., a music or video device, or a satellite radio) , a vehicular component or sensor, smart meters/sensors, industrial manufacturing equipment, a global positioning system device, or any other suitable device that is configured to communicate via a wireless or wired medium.
  • PDA personal digital assistant
  • WLL wireless local loop
  • MTC and eMTC UEs include, for example, robots, drones, remote devices, such as sensors, meters, monitors, location tags, etc., that may communicate with a base station, another device (e.g., remote device) , or some other entity.
  • a wireless node may provide, for example, connectivity for or to a network (e.g., a wide area network such as Internet or a cellular network) via a wired or wireless communication link.
  • Some UEs may be considered Internet-of-Things (IoT) devices, and/or may be implemented as narrowband IoT (NB-IoT) devices.
  • IoT Internet-of-Things
  • NB-IoT narrowband IoT
  • an NB-IoT UE may establish an RRC connection with a BS, and may transmit a relatively small amount of information using the RRC connection.
  • the NB-IoT UE may use an RLC Acknowledged Mode, in combination with a physical-layer HARQ technique, to acknowledge communications relating to setup or release of the RRC connection.
  • Some UEs may be considered a Customer Premises Equipment (CPE) .
  • CPE Customer Premises Equipment
  • UE 120 may be included inside a housing that houses components of UE 120, such as processor components, memory components, and/or the like.
  • any number of wireless networks may be deployed in a given geographic area.
  • Each wireless network may support a particular RAT and may operate on one or more frequencies.
  • a RAT may also be referred to as a radio technology, an air interface, and/or the like.
  • a frequency may also be referred to as a carrier, a frequency channel, and/or the like.
  • Each frequency may support a single RAT in a given geographic area in order to avoid interference between wireless networks of different RATs.
  • NR or 5G RAT networks may be deployed.
  • a scheduling entity e.g., a base station
  • the scheduling entity may be responsible for scheduling, assigning, reconfiguring, and releasing resources for one or more subordinate entities. That is, for scheduled communication, subordinate entities utilize resources allocated by the scheduling entity.
  • Base stations are not the only entities that may function as a scheduling entity. That is, in some examples, a UE may function as a scheduling entity, scheduling resources for one or more subordinate entities (e.g., one or more other UEs) . In this example, the UE is functioning as a scheduling entity, and other UEs utilize resources scheduled by the UE for wireless communication.
  • a UE may function as a scheduling entity in a peer-to-peer (P2P) network, and/or in a mesh network. In a mesh network example, UEs may optionally communicate directly with one another in addition to communicating with the scheduling entity.
  • P2P peer-to-peer
  • mesh network UEs may optionally communicate directly with one another in addition to communicating with the scheduling entity.
  • a scheduling entity and one or more subordinate entities may communicate utilizing the scheduled resources.
  • FIG. 1 is provided merely as an example. Other examples are possible and may differ from what was described with regard to FIG. 1.
  • FIG. 2 shows a block diagram 200 of a design of base station 110 and UE 120, which may be one of the base stations and one of the UEs in FIG. 1.
  • Base station 110 may be equipped with T antennas 234a through 234t
  • UE 120 may be equipped with R antennas 252a through 252r, where in general T ⁇ 1 and R ⁇ 1.
  • a transmit processor 220 may receive data from a data source 212 for one or more UEs, select one or more modulation and coding schemes (MCS) for each UE based at least in part on channel quality indicators (CQIs) received from the UE, process (e.g., encode and modulate) the data for each UE based at least in part on the MCS (s) selected for the UE, and provide data symbols for all UEs. Transmit processor 220 may also process system information (e.g., for semi-static resource partitioning information (SRPI) , and/or the like) and control information (e.g., CQI requests, grants, upper layer signaling, and/or the like) and provide overhead symbols and control symbols.
  • MCS modulation and coding schemes
  • Transmit processor 220 may also generate reference symbols for reference signals (e.g., the cell-specific reference signal (CRS) ) and synchronization signals (e.g., the primary synchronization signal (PSS) and secondary synchronization signal (SSS) ) .
  • a transmit (TX) multiple-input multiple-output (MIMO) processor 230 may perform spatial processing (e.g., precoding) on the data symbols, the control symbols, the overhead symbols, and/or the reference symbols, if applicable, and may provide T output symbol streams to T modulators (MODs) 232a through 232t. Each modulator 232 may process a respective output symbol stream (e.g., for OFDM and/or the like) to obtain an output sample stream.
  • TX transmit
  • MIMO multiple-input multiple-output
  • Each modulator 232 may process a respective output symbol stream (e.g., for OFDM and/or the like) to obtain an output sample stream.
  • Each modulator 232 may further process (e.g., convert to analog, amplify, filter, and upconvert) the output sample stream to obtain a downlink signal.
  • T downlink signals from modulators 232a through 232t may be transmitted via T antennas 234a through 234t, respectively.
  • the synchronization signals can be generated with location encoding to convey additional information.
  • antennas 252a through 252r may receive the downlink signals from base station 110 and/or other base stations and may provide received signals to demodulators (DEMODs) 254a through 254r, respectively.
  • Each demodulator 254 may condition (e.g., filter, amplify, downconvert, and digitize) a received signal to obtain input samples.
  • Each demodulator 254 may further process the input samples (e.g., for OFDM and/or the like) to obtain received symbols.
  • a MIMO detector 256 may obtain received symbols from all R demodulators 254a through 254r, perform MIMO detection on the received symbols if applicable, and provide detected symbols.
  • a receive (RX) processor 258 may process (e.g., demodulate and decode) the detected symbols, provide decoded data for UE 120 to a data sink 260, and provide decoded control information and system information to a controller/processor 280.
  • a channel processor may determine reference signal received power (RSRP) , received signal strength indicator (RSSI) , reference signal received quality (RSRQ) , channel quality indicator (CQI) , and/or the like.
  • a transmit processor 264 may receive and process data from a data source 262 and control information (e.g., for reports comprising RSRP, RSSI, RSRQ, CQI, and/or the like) from controller/processor 280. Transmit processor 264 may also generate reference symbols for one or more reference signals. In some aspects, transmit processor 264 may generate physical-layer and/or control channel indications of successful receipt of an RRC connection release, as described in more detail elsewhere herein.
  • the symbols from transmit processor 264 may be precoded by a TX MIMO processor 266 if applicable, further processed by modulators 254a through 254r (e.g., for DFT-s-OFDM, CP-OFDM, and/or the like) , and transmitted to base station 110.
  • modulators 254a through 254r e.g., for DFT-s-OFDM, CP-OFDM, and/or the like
  • the uplink signals from UE 120 and other UEs may be received by antennas 234, processed by demodulators 232, detected by a MIMO detector 236 if applicable, and further processed by a receive processor 238 to obtain decoded data and control information sent by UE 120.
  • Receive processor 238 may provide the decoded data to a data sink 239 and the decoded control information to controller/processor 240.
  • Base station 110 may include communication unit 244 and communicate to network controller 130 via communication unit 244.
  • Network controller 130 may include communication unit 294, controller/
  • Controllers/processors 240 and 280 and/or any other component (s) in FIG. 2 may direct the operation at base station 110 and UE 120, respectively, to perform RRC connection release using control channel indications.
  • controller/processor 240 and/or other processors and modules at base station 110 may perform or direct operations of UE 120 to perform RRC connection release using control channel indications.
  • controller/processor 240 and/or other controllers/processors and modules at base station 110 may perform or direct operations of, for example, method 700 of FIG. 7 and/or other processes as described herein.
  • one or more of the components shown in FIG. 2 may be employed to perform example method 700 of FIG. 7 and/or other processes for the techniques described herein.
  • controller/processor 280 and/or other processors and modules at UE 120 may perform or direct operations of UE 120 to perform RRC connection release using control channel indications.
  • controller/processor 280 and/or other controllers/processors and modules at UE 120 may perform or direct operations of, for example, method 700 of FIG. 7 and/or other processes as described herein.
  • one or more of the components shown in FIG. 2 may be employed to perform example method 700 of FIG. 7 and/or other processes for the techniques described herein.
  • Memories 242 and 282 may store data and program codes for base station 110 and UE 120, respectively.
  • a scheduler 246 may schedule UEs for data transmission on the downlink and/or uplink.
  • FIG. 2 is provided merely as an example. Other examples are possible and may differ from what was described with regard to FIG. 2.
  • FIG. 3 shows an example frame structure 300 for frequency division duplexing (FDD) in a telecommunications system (e.g., LTE) .
  • the transmission timeline for each of the downlink and uplink may be partitioned into units of radio frames.
  • Each radio frame may have a predetermined duration (e.g., 10 milliseconds (ms)) and may be partitioned into 10 subframes with indices of 0 through 9.
  • Each subframe may include two slots.
  • Each radio frame may thus include 20 slots with indices of 0 through 19.
  • Each slot may include L symbol periods, e.g., seven symbol periods for a normal cyclic prefix (as shown in FIG. 3) or six symbol periods for an extended cyclic prefix.
  • the 2L symbol periods in each subframe may be assigned indices of 0 through 2L–1.
  • a wireless communication structure may refer to a periodic time-bounded communication unit defined by a wireless communication standard and/or protocol.
  • a BS may transmit a primary synchronization signal (PSS) and a secondary synchronization signal (SSS) on the downlink in the center of the system bandwidth for each cell supported by the BS.
  • PSS primary synchronization signal
  • SSS secondary synchronization signal
  • the PSS and SSS may be transmitted in symbol periods 6 and 5, respectively, in subframes 0 and 5 of each radio frame with the normal cyclic prefix, as shown in FIG. 3.
  • the PSS and SSS may be used by UEs for cell search and acquisition.
  • the BS may transmit a cell-specific reference signal (CRS) across the system bandwidth for each cell supported by the BS.
  • CRS cell-specific reference signal
  • the CRS may be transmitted in certain symbol periods of each subframe and may be used by the UEs to perform channel estimation, channel quality measurement, and/or other functions.
  • the BS may also transmit a physical broadcast channel (PBCH) in symbol periods 0 to 3 in slot 1 of certain radio frames.
  • PBCH physical broadcast channel
  • the PBCH may carry some system information.
  • the BS may transmit other system information such as system information blocks (SIBs) on a physical downlink shared channel (PDSCH) in certain subframes.
  • SIBs system information blocks
  • PDSCH physical downlink shared channel
  • the BS may transmit control information/data on a physical downlink control channel (PDCCH) in the first B symbol periods of a subframe, where B may be configurable for each subframe.
  • the BS may transmit traffic data and/or other data on the PDSCH in the remaining symbol periods of each subframe.
  • the UE 120 may use similar and/or different shared channels and/or control channels.
  • the UE 120 may use a narrowband physical uplink shared channel (NPUSCH) , a narrowband PDCCH (NPDCCH) , a narrowband PDSCH (NPDSCH) , and/or the like.
  • NPUSCH narrowband physical uplink shared channel
  • NPDCCH narrowband PDCCH
  • NPDSCH narrowband PDSCH
  • a Node B may transmit these or other signals in these locations or in different locations of the subframe.
  • FIG. 3 is provided merely as an example. Other examples are possible and may differ from what was described with regard to FIG. 3.
  • FIG. 4 shows two example subframe formats 410 and 420 with the normal cyclic prefix.
  • the available time frequency resources may be partitioned into resource blocks.
  • Each resource block may cover 12 subcarriers in one slot and may include a number of resource elements.
  • Each resource element may cover one subcarrier in one symbol period and may be used to send one modulation symbol, which may be a real or complex value.
  • Subframe format 410 may be used for two antennas.
  • a CRS may be transmitted from antennas 0 and 1 in symbol periods 0, 4, 7 and 11.
  • a reference signal is a signal that is known a priori by a transmitter and a receiver and may also be referred to as a pilot signal.
  • a CRS is a reference signal that is specific for a cell, e.g., generated based at least in part on a cell identity (ID) .
  • ID cell identity
  • Subframe format 420 may be used with four antennas.
  • a CRS may be transmitted from antennas 0 and 1 in symbol periods 0, 4, 7 and 11 and from antennas 2 and 3 in symbol periods 1 and 8.
  • a CRS may be transmitted on evenly spaced subcarriers, which may be determined based at least in part on cell ID.
  • CRSs may be transmitted on the same or different subcarriers, depending on their cell IDs.
  • resource elements not used for the CRS may be used to transmit data (e.g., traffic data, control data, and/or other data) .
  • E-UTRA Evolved Universal Terrestrial Radio Access
  • An interlace structure may be used for each of the downlink and uplink for FDD in certain telecommunications systems (e.g., LTE) .
  • Q interlaces with indices of 0 through Q –1 may be defined, where Q may be equal to 4, 6, 8, 10, or some other value.
  • Each interlace may include subframes that are spaced apart by Q frames.
  • interlace q may include subframes q, q + Q, q + 2Q, and/or the like, where q ⁇ ⁇ 0, ..., Q-1 ⁇ .
  • the wireless network may support hybrid automatic retransmission request (HARQ) for data transmission on the downlink and uplink.
  • HARQ hybrid automatic retransmission request
  • a transmitter e.g., a BS
  • a receiver e.g., a UE
  • all transmissions of the packet may be sent in subframes of a single interlace.
  • each transmission of the packet may be sent in any subframe.
  • a UE may be located within the coverage of multiple BSs. One of these BSs may be selected to serve the UE. The serving BS may be selected based at least in part on various criteria such as received signal strength, received signal quality, path loss, and/or the like. Received signal quality may be quantified by a signal-to-noise-and- interference ratio (SINR) , or a reference signal received quality (RSRQ) , or some other metric.
  • SINR signal-to-noise-and- interference ratio
  • RSRQ reference signal received quality
  • aspects of the examples described herein may be associated with LTE technologies, aspects of the present disclosure may be applicable with other wireless communication systems, such as NR or 5G technologies.
  • New radio may refer to radios configured to operate according to a new air interface (e.g., other than Orthogonal Frequency Divisional Multiple Access (OFDMA) -based air interfaces) or fixed transport layer (e.g., other than Internet Protocol (IP) ) .
  • NR may utilize OFDM with a CP (herein referred to as cyclic prefix OFDM or CP-OFDM) and/or SC-FDM on the uplink, may utilize CP-OFDM on the downlink and include support for half-duplex operation using time division duplexing (TDD) .
  • OFDM Orthogonal Frequency Divisional Multiple Access
  • IP Internet Protocol
  • NR may, for example, utilize OFDM with a CP (herein referred to as CP-OFDM) and/or discrete Fourier transform spread orthogonal frequency-division multiplexing (DFT-s-OFDM) on the uplink, may utilize CP-OFDM on the downlink and include support for half-duplex operation using TDD.
  • CP-OFDM OFDM with a CP
  • DFT-s-OFDM discrete Fourier transform spread orthogonal frequency-division multiplexing
  • NR may include Enhanced Mobile Broadband (eMBB) service targeting wide bandwidth (e.g., 80 megahertz (MHz) and beyond) , millimeter wave (mmW) targeting high carrier frequency (e.g., 60 gigahertz (GHz) ) , massive MTC (mMTC) targeting non-backward compatible MTC techniques, and/or mission critical targeting ultra reliable low latency communications (URLLC) service.
  • eMBB Enhanced Mobile Broadband
  • mmW millimeter wave
  • mMTC massive MTC
  • URLLC ultra reliable low latency communications
  • NR resource blocks may span 12 sub-carriers with a sub-carrier bandwidth of 75 kilohertz (kHz) over a 0.1 ms duration.
  • Each radio frame may include 50 subframes with a length of 10 ms. Consequently, each subframe may have a length of 0.2 ms.
  • Each subframe may indicate a link direction (e.g., DL or UL) for data transmission and the link direction for each subframe may be dynamically switched.
  • Each subframe may include downlink/uplink (DL/UL) data as well as DL/UL control data.
  • NR may support a different air interface, other than an OFDM-based interface.
  • NR networks may include entities such central units or distributed units.
  • the RAN may include a central unit (CU) and distributed units (DUs) .
  • a NR BS e.g., gNB, 5G Node B, Node B, transmit receive point (TRP) , access point (AP)
  • NR cells can be configured as access cells (ACells) or data only cells (DCells) .
  • the RAN e.g., a central unit or distributed unit
  • DCells may be cells used for carrier aggregation or dual connectivity, but not used for initial access, cell selection/reselection, or handover.
  • DCells may not transmit synchronization signals.
  • DCells may transmit synchronization signals.
  • NR BSs may transmit downlink signals to UEs indicating the cell type. Based at least in part on the cell type indication, the UE may communicate with the NR BS. For example, the UE may determine NR BSs to consider for cell selection, access, handover, and/or measurement based at least in part on the indicated cell type.
  • FIG. 4 is provided merely as an example. Other examples are possible and may differ from what was described with regard to FIG. 4.
  • FIG. 5 is a diagram illustrating an example 500 of RRC connection release enhancements.
  • Example 500 is an example wherein a UE 120 enters an RRC idle mode based at least in part on signaling in an uplink control channel of the UE 120. As shown, the UE 120 may be in an RRC connected mode at the start of example 500.
  • the UE 120 may transmit uplink data to the BS 110.
  • the uplink data may include RLC data or any other type of data that can be provided in an uplink shared channel by the UE 120.
  • the RLC may be provided in an uplink shared channel (e.g., a PUSCH, an NPUSCH, and/or the like) .
  • the UE 120 may receive downlink control information (DCI) in a downlink control channel of the UE 120 (e.g., a PDCCH, an NPDCCH, and/or the like) .
  • the DCI may identify a grant for a downlink shared channel (e.g., on which an RLC status message and/or RRC connection release are to be provided) , and/or may identify a grant for resources on which to provide a HARQ acknowledgment of an RLC status message and/or RRC connection release.
  • the DCI may identify the RLC status message and/or the RRC connection release, as described in more detail in connection with FIGs. 6A and 6B, below.
  • the grant for the HARQ acknowledgment may indicate that the UE 120 is to transmit multiple repetitions of the HARQ acknowledgment.
  • the BS 110 may request an RLC status from the UE 120 so that the BS 110 can determine whether the UE 120 received the RRC connection release, since a single HARQ transmission for the RRC connection release may not be reliable.
  • the BS 110 may improve reliability of the HARQ acknowledgment, thereby reducing signaling by eliminating the need for the RLC status message.
  • the HARQ transmission may use fewer network resources and may require less transmission time than an RLC status message.
  • the UE 120 may receive an RLC status report (e.g., shown as RLC STATUS PDU) and an RRC connection release.
  • the BS 110 may provide the RRC connection release to cause the UE 120 to release an RRC connection of the UE 120.
  • the UE 120 may determine that the UE 120 is to perform multiple transmissions of the HARQ transmission based at least in part on receiving the RLC status report and the RRC connection release.
  • the UE 120 may determine that the UE 120 is to perform multiple repetitions of the HARQ acknowledgment (e.g., using the multiple grants identified by the DCI for the HARQ acknowledgment) .
  • the UE 120 can determine that multiple repetitions of the HARQ acknowledgment are to be transmitted without reconfiguration of a DCI format of the UE 120.
  • the UE 120 may receive the RLC status report and/or the RRC connection release in a media access control (MAC) message, such as in a MAC packet data unit (PDU) and/or the like.
  • MAC media access control
  • the UE 120 may transmit a HARQ acknowledgment for the RRC connection release and, as shown by reference number 550, the UE 120 may retransmit the HARQ acknowledgment (e.g., based at least in part on the DCI, the RLC status report, and/or the RRC connection release) .
  • the UE 120 improves likelihood that the BS 110 is notified of successful receipt of the RRC connection release, thus eliminating the need for a costly RLC status message and reducing overhead.
  • the UE 120 may enter an RRC idle mode after the HARQ transmissions are complete.
  • the RRC idle mode may be triggered by completion of the HARQ transmission.
  • messaging overhead is reduced in comparison to a legacy RRC release technique, which conserves battery power and network resources of the UE 120 and the BS 110 respectively.
  • FIG. 5 is provided as an example. Other examples are possible and may differ from what was described with respect to FIG. 5.
  • FIGs. 6A and 6B are diagrams illustrating examples 600 of RRC connection release enhancements.
  • Example 600 is an example wherein a UE 120 enters an RRC idle mode based at least in part on signaling in an uplink control channel of the UE 120. As shown, the UE 120 may be in an RRC connected mode at the start of example 600.
  • FIGs. 6A and 6B may differ from FIG. 5 in that the RLS Status and RRC connection release is provided in the DCI, rather than in the NPDSCH or MAC channel.
  • the UE 120 may transmit RLC data to the BS 110 in an uplink shared channel, as is described in more detail in connection with FIG. 5, above.
  • the UE 120 may receive DCI identifying an RLC acknowledgment regarding the RLC data and an RRC connection release.
  • the UE 120 may receive the DCI in an NPDCCH, a PDCCH, and/or the like.
  • the DCI may include a grant of resources for the HARQ transmission, as described in more detail in connection with FIG. 5, above.
  • the DCI format may be configured to indicate information associated with process 500 and/or process 600.
  • Table 1 For example, refer to the following Table 1:
  • a UE 120 performing RRC connection release may refer to bit 10 of a received DCI to determine whether the UE 120 is commanded to use a modified RRC connection release technique. If bit 10 is set to a first value (e.g., 1) , then the UE 120 may follow the legacy procedure for the PDCCH. If bit 10 is set to a second value (e.g., 0) , then the UE 120 may use the modified RRC connection release procedure as described herein. In some aspects, if bit 10 is set to the second value, then bits 2 through 9 may be set to a constant (e.g., 0) that can be used as an additional check to avoid false interpretation by legacy UEs of the DCI coding as a PDCCH order.
  • the DCI for RRC connection release may use a modified radio network temporary identifier (RNTI) to indicate that the modified RRC connection release technique is to be used, and/or may use an invalid state of DCI format N0/N1.
  • RNTI radio network temporary identifier
  • the invalid state may include a state that deviates in some fashion from a default state of DCI format N0/N1.
  • the modified RNTI can be indicated explicitly or implicitly (e.g., by performing a mask of an RNTI, and/or the like) .
  • the number of repetitions of NPUSCH may be increased with respect to a typical number of repetitions for NPUSCH data. In some aspects, this increase in the number of repetitions may be fixed in a specification (e.g., twice a number that is semi-statically configured) or may be indicated explicitly in the DCI.
  • the UE 120 may transmit a HARQ acknowledgment for the RRC connection release, and as shown by reference number 640, the UE 120 may retransmit the HARQ acknowledgment.
  • the UE 120 may repeat the HARQ acknowledgment within a single transmission (e.g., as a single HARQ with multiple repetitions) .
  • the UE 120 may transmit multiple, different HARQ acknowledgments. In this way, the UE 120 may improve a likelihood that the HARQ acknowledgment is received, which reduces or eliminates the need for an RLC status update by the UE 120.
  • the UE 120 improves operation of the network 100 because the BS 110 may act according to the HARQ acknowledgment when the BS 110 might otherwise take steps inconsistent with the HARQ acknowledgment. As further shown, the UE 120 releases the RRC connection and enters an RRC idle mode after the HARQ acknowledgment is transmitted.
  • the UE 120 transmits a PRACH preamble (or a narrowband PRACH (NPRACH) preamble) to indicate successful reception of the RRC connection release.
  • a PRACH preamble or a narrowband PRACH (NPRACH) preamble
  • NPRACH narrowband PRACH
  • the UE 120 may transmit RLC data to the BS 110, as described in more detail in connection with FIG. 5, above.
  • the BS 110 may transmit DCI to the UE 120 identifying the RLC acknowledgment and the RRC connection release, as described in more detail in connection with FIG. 6A, above.
  • the DCI may include a grant of resources for the PRACH, or may indicate, to the UE 120, that the UE 120 is to transmit a PRACH to indicate successful receipt of the RRC connection release.
  • the DCI may have a particular format, such as the format shown in Table 2, below:
  • bits 11 through 16 specify a PRACH (e.g., NPRACH) preamble for the UE 120, and bit 10 specifies that the UE 120 is to perform the modified RRC connection release procedure.
  • the UE 120 may consider all transmitted RLC data blocks acknowledged, the UE 120 may transmit the specified PRACH using PRACH resources provided in the DCI (e.g., the subcarrier indication) , and after completion of the PRACH transmission, may consider RRC connection released.
  • the UE 120 may transmit a PRACH to the BS 110 on an uplink control channel of the UE 120.
  • the PRACH may indicate to the BS 110 that the UE 120 successfully received the RRC connection release.
  • the UE 120 may reduce an amount of signaling and conserve network resources that would otherwise be used to request (by the BS 110) and provide (by the UE 120) the RLC status message indicating that the UE 120 has received the RRC connection release indicator.
  • the PRACH may include a contention free RACH preamble.
  • the BS 110 may specify a particular RACH preamble and/or resources in which to transmit the RACH preamble. In such a case, the UE 120 may transmit the particular RACH preamble in the specified resources, which reduces a likelihood of a collision of RACH transmissions of two or more UEs 120.
  • FIGs. 6A and 6B are provided as examples. Other examples are possible and may differ from what was described in connection with FIGs. 6A and 6B.
  • FIG. 7 is a flow chart of a method 700 of wireless communication.
  • the method 700 may be performed by a user equipment (e.g., the UE 120 of FIG. 1, the apparatus 802/802’, and/or the like) .
  • a user equipment e.g., the UE 120 of FIG. 1, the apparatus 802/802’, and/or the like.
  • the UE may optionally transmit information indicating that the UE is capable of receiving a radio link status report and/or a radio connection release indication in a downlink channel.
  • the UE may transmit information indicating that the UE is capable of or configured to perform operations described herein relating to transmission of an indicator in an uplink channel.
  • the indication may include an indication that the UE has received an RRC connection release.
  • the indication may include two or more transmissions of a HARQ acknowledgment, a PRACH, and/or the like.
  • the information indicating that the UE is capable of transmitting the indication in the uplink control channel may include, for example, a UE capability report and/or the like.
  • the information, or different information transmitted by the UE may indicate, to a BS and/or the like, that the UE is capable of receiving a radio link status report and/or a radio connection release indication in DCI.
  • the user equipment may receive a signal indicating to transmit an indication in the uplink control channel.
  • the UE may transmit the indication in the uplink control channel based at least in part on receiving the signal.
  • the signal may include a system information block (SIB) and/or the like.
  • the user equipment may receive, in the downlink control channel, the radio link status report and the radio connection release.
  • the user equipment may receive the radio link status report and the radio connection release.
  • the radio link status report and/or the radio connection release may be included in a MAC PDU. Additionally, or alternatively, the radio link status report and/or the radio connection release may be included in a PDCCH, an NPDCCH, and/or the like.
  • the radio connection release and the acknowledgment may be received in downlink control information.
  • the user equipment may transmit, in an uplink control channel, an indication of successful receipt of the radio link status report and the radio connection release.
  • the indication may include multiple transmissions of a HARQ acknowledgment (e.g., to improve likelihood of successful receipt of the radio connection release) .
  • the indication may include a random access channel preamble associated with the UE, such as a PRACH (e.g., a PRACH of the UE or a contention-free PRACH assigned to the UE in association with the radio link status report and the radio connection release) .
  • a PRACH e.g., a PRACH of the UE or a contention-free PRACH assigned to the UE in association with the radio link status report and the radio connection release
  • the user equipment may transmit the indication in the uplink control channel based at least in part on receiving the radio connection release and/or the radio link status report in the downlink control channel (e.g., and/or in the MAC PDU) .
  • the indication is transmitted in resources identified in a grant to the user equipment, and wherein the grant is provided with the radio link status report and the radio connection release.
  • the indication may include an initial HARQ transmission and a repetition of the initial HARQ transmission pertaining to the radio link status report and the radio connection release.
  • the repetition may be transmitted after a delay following the initial HARQ transmission, and information identifying the delay may be received with the radio link status report and the radio connection release.
  • the indication may be transmitted in resources identified in a grant to the UE, and the grant may be provided in the downlink control channel. In such a case, information identifying a number of repetitions associated with the indication may be provided to the user equipment in the downlink control channel. In some aspects, information identifying a number of repetitions associated with the indication (e.g., for a HARQ acknowledgment) is provided to the UE in the downlink control channel.
  • the user equipment may optionally enter a radio idle mode triggered by transmitting the indicating and/or after completion of transmitting of the indication.
  • the UE enters RRC idle mode based at least in part on an RRC connection release, and transmits information to the BS 110 indicating successful receipt of the RRC connection release without transmitting an RLC status message, thereby reducing overhead and conserving resources of the UE and the BS 110.
  • FIG. 7 shows example blocks of a method of wireless communication
  • the method may include additional blocks, fewer blocks, different blocks, or differently arranged blocks than those shown in FIG. 7. Additionally, or alternatively, two or more blocks shown in FIG. 7 may be performed in parallel.
  • FIG. 8 is a conceptual data flow diagram 800 illustrating the data flow between different modules/means/components in an example apparatus 802.
  • the apparatus 802 may be a UE (e.g., the UE 120) .
  • the apparatus 802 includes a reception module 804 and/or a transmission module 806.
  • the reception module 804 may receive data 808 from base station 850 (e.g., BS 110 and/or the like) identifying an RRC connection release.
  • the data 808 may include a MAC PDU and/or may be included in a PDCCH.
  • the reception module 804 (or another module of the apparatus 802) may provide data 810 to the transmission module 806.
  • the data 810 may include a HARQ acknowledgment or retransmission, a PRACH of the apparatus 802, and/or the like.
  • the transmission module 806 may transmit the data 810 as signals 812.
  • the apparatus may include additional modules that perform each of the blocks of the algorithm in the aforementioned flow chart of FIG. 7. As such, each block in the aforementioned flow chart of FIG. 7 may be performed by a module and the apparatus may include one or more of those modules.
  • the modules 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.
  • modules shown in FIG. 8 are provided as an example. In practice, there may be additional modules, fewer modules, different modules, or differently arranged modules than those shown in FIG. 8. Furthermore, two or more modules shown in FIG. 8 may be implemented within a single module, or a single module shown in FIG. 8 may be implemented as multiple, distributed modules. Additionally, or alternatively, a set of modules (e.g., one or more modules) shown in FIG. 8 may perform one or more functions described as being performed by another set of modules shown in FIG. 8.
  • FIG. 9 is a diagram 900 illustrating an example of a hardware implementation for an apparatus 802'employing a processing system 902.
  • the apparatus 802' may be a UE (e.g., the UE 120) .
  • the processing system 902 may be implemented with a bus architecture, represented generally by the bus 904.
  • the bus 904 may include any number of interconnecting buses and bridges depending on the specific application of the processing system 902 and the overall design constraints.
  • the bus 904 links together various circuits including one or more processors and/or hardware modules, represented by the processor 906, the modules 804, 806, and the computer-readable medium /memory 908.
  • the bus 904 may also link various other circuits such as timing sources, peripherals, voltage regulators, and power management circuits, which are well known in the art, and therefore, will not be described any further.
  • the processing system 902 may be coupled to a transceiver 910.
  • the transceiver 910 is coupled to one or more antennas 912.
  • the transceiver 910 provides a means for communicating with various other apparatus over a transmission medium.
  • the transceiver 910 receives a signal from the one or more antennas 912, extracts information from the received signal, and provides the extracted information to the processing system 902, specifically the reception module 804.
  • the transceiver 910 receives information from the processing system 902, specifically the transmission module 806, and based at least in part on the received information, generates a signal to be applied to the one or more antennas 912.
  • the processing system 902 includes a processor 906 coupled to a computer-readable medium /memory 908.
  • the processor 906 is responsible for general processing, including the execution of software stored on the computer-readable medium /memory 908.
  • the software when executed by the processor 906, causes the processing system 902 to perform the various functions described supra for any particular apparatus.
  • the computer-readable medium /memory 908 may also be used for storing data that is manipulated by the processor 906 when executing software.
  • the processing system further includes at least one of the modules 804 and 806.
  • the modules may be software modules running in the processor 906, resident/stored in the computer readable medium /memory 908, one or more hardware modules coupled to the processor 906, or some combination thereof.
  • the processing system 902 may be a component of the UE 120 and may include the memory 282 and/or at least one of the TX MIMO processor 266, the RX processor 258, and/or the controller/processor 280.
  • the apparatus 802/802'for wireless communication includes means for receiving, in a downlink control channel, a radio link status report and a radio connection release; means for transmitting, in an uplink control channel, an indication of successful receipt of the radio link status report and the radio connection release, wherein the indication is transmitted in the uplink control channel based at least in part on receiving the radio link status report and the radio connection release in the downlink control channel; means for entering a radio idle mode, wherein entering the radio idle mode is triggered by transmitting the indication; means for receiving a signal indicating to transmit the indication in the uplink control channel; means for transmitting information indicating that the apparatus 802/802’is capable of transmitting the indication in the uplink control channel; and/or means for entering an idle mode after completion of transmission of the indication.
  • the aforementioned means may be one or more of the aforementioned modules of the apparatus 802 and/or the processing system 902 of the apparatus 802'configured to perform the functions recited by the aforementioned means.
  • the processing system 902 may include the TX MIMO processor 266, the RX processor 258, and/or the controller/processor 280.
  • the aforementioned means may be the TX MIMO processor 266, the RX processor 258, and/or the controller/processor 280 configured to perform the functions recited by the aforementioned means.
  • FIG. 9 is provided as an example. Other examples are possible and may differ from what was described in connection with FIG. 9.
  • Combinations such as “at least one of A, B, or C, ” “at least one 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, ” “at least one 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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Abstract

La présente invention concerne certaines techniques et appareils qui fournissent une libération de connexion de commande de ressource radio pour un équipement utilisateur à l'aide d'un nombre réduit de messages et/ou à l'aide de messages qui sont communiqués dans un canal de commande (par ex., un canal de commande de liaison montante et/ou un canal de commande de liaison descendante). Par exemple, les messages peuvent comprendre une transmission initiale et une retransmission d'un message de demande de répétition automatique hybride, d'un préambule d'accès aléatoire physique (PRACH), et/ou analogue(s). Par transmission des messages dans le canal de commande, des ressources sont conservées qui seraient autrement utilisées afin d'autoriser des ressources de canal partagées. En outre, l'équipement utilisateur peut automatiquement entrer dans un mode inactif RRC après transmission des messages, ce qui conserve les ressources de batterie de l'équipement utilisateur.
PCT/CN2017/093125 2017-07-17 2017-07-17 Appareils et techniques d'améliorations de libération de connexion de commande de ressource radio WO2019014805A1 (fr)

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