WO2021138791A1 - Transmission de commande d'avance temporelle dans des informations de commande de liaison descendante pour une suspension de groupe de cellules secondaires - Google Patents

Transmission de commande d'avance temporelle dans des informations de commande de liaison descendante pour une suspension de groupe de cellules secondaires Download PDF

Info

Publication number
WO2021138791A1
WO2021138791A1 PCT/CN2020/070591 CN2020070591W WO2021138791A1 WO 2021138791 A1 WO2021138791 A1 WO 2021138791A1 CN 2020070591 W CN2020070591 W CN 2020070591W WO 2021138791 A1 WO2021138791 A1 WO 2021138791A1
Authority
WO
WIPO (PCT)
Prior art keywords
configuration
secondary cell
communications
cell group
uplink message
Prior art date
Application number
PCT/CN2020/070591
Other languages
English (en)
Inventor
Peng Cheng
Xiaoxia Zhang
Huilin Xu
Original Assignee
Qualcomm Incorporated
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by Qualcomm Incorporated filed Critical Qualcomm Incorporated
Priority to PCT/CN2020/070591 priority Critical patent/WO2021138791A1/fr
Priority to PCT/CN2020/138254 priority patent/WO2021139523A1/fr
Publication of WO2021138791A1 publication Critical patent/WO2021138791A1/fr

Links

Images

Classifications

    • 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
    • H04W76/10—Connection setup
    • H04W76/15—Setup of multiple wireless link connections

Definitions

  • the following relates generally to wireless communications and more specifically to timing advance (TA) control transmission in downlink control information (DCI) for secondary cell group (SCG) suspension.
  • DCI downlink control information
  • SCG secondary cell group
  • Wireless communications systems are widely deployed to provide various types of communication content such as voice, video, packet data, messaging, broadcast, and so on. These systems may be capable of supporting communication with multiple users by sharing the available system resources (e.g., time, frequency, and power) .
  • Examples of such multiple-access systems include fourth generation (4G) systems such as Long Term Evolution (LTE) systems, LTE-Advanced (LTE-A) systems, or LTE-A Pro systems, and fifth generation (5G) systems which may be referred to as New Radio (NR) systems.
  • 4G systems such as Long Term Evolution (LTE) systems, LTE-Advanced (LTE-A) systems, or LTE-A Pro systems
  • 5G systems which may be referred to as New Radio (NR) systems.
  • CDMA code division multiple access
  • TDMA time division multiple access
  • FDMA frequency division multiple access
  • OFDMA orthogonal frequency division multiple access
  • DFT-S-OFDM discrete Fourier transform spread orthogonal frequency division multiplexing
  • a wireless multiple-access communications system may include a number of base stations or network access nodes, each simultaneously supporting communication for multiple communication devices, which may be otherwise known as user equipment (UE) .
  • UE user equipment
  • a UE may be configured to simultaneously connect to and communicate with a network using multiple cells, such as in dual connectivity (DC) and carrier aggregation (CA) operations.
  • DC dual connectivity
  • CA carrier aggregation
  • the UE may resume communications with one or more of the cells after a period of inactivity. Techniques to efficiently resume communications between the UE and network are desired.
  • the described techniques relate to improved methods, systems, devices, and apparatuses that support timing advance (TA) control transmission in downlink control information (DCI) for secondary cell group (SCG) suspension.
  • TA timing advance
  • DCI downlink control information
  • SCG secondary cell group
  • the described techniques provide for a user equipment (UE) communicating with both a master cell group (MCG) and an SCG (e.g., for a dual connectivity (DC) deployment, carrier aggregation (CA) configuration, etc. ) to transmit an uplink message to a primary secondary cell (PSCell) of the SCG after communications with the SCG have been suspended, where the PSCell responds with DCI that includes TA information for the UE to use for subsequent communications with the SCG.
  • MCG master cell group
  • SCG e.g., for a dual connectivity (DC) deployment, carrier aggregation (CA) configuration, etc.
  • the UE may transmit a physical random access channel (PRACH) preamble message to the PSCell to reestablish communications with the SCG, and the PSCell may respond with DCI that includes TA information to enable the UE to transmit subsequent uplink messages to the PSCell such that the uplink messages are received at the PSCell aligned to downlink frames (e.g., downlink transmission time intervals (TTIs) , downlink subframes, etc. ) configured at the PSCell.
  • PRACH physical random access channel
  • the UE may transmit a preconfigured uplink message (e.g., a preconfigured physical uplink shared channel (PUSCH) transmission configured via radio resource control (RRC) signaling) to the PSCell, and the PSCell may respond with a DCI to acknowledge the preconfigured uplink message was successfully received and decoded, where the DCI includes the TA information for aligning the subsequent uplink messages.
  • a preconfigured uplink message e.g., a preconfigured physical uplink shared channel (PUSCH) transmission configured via radio resource control (RRC) signaling
  • RRC radio resource control
  • the DCI transmitted by the PSCell may be scrambled with a cell radio network temporary identifier (C-RNTI) for the UE, a dedicated TA radio network temporary identifier (RNTI) , a random access RNTI (RA-RNTI) , an RNTI corresponding to a control resource set (CORESET) for the UE, an RNTI corresponding to a search space for the UE, or a combination thereof.
  • C-RNTI cell radio network temporary identifier
  • RNTI dedicated TA radio network temporary identifier
  • RA-RNTI random access RNTI
  • CORESET control resource set
  • the UE may receive a monitoring configuration (e.g., via RRC signaling from a master node in the MCG) for monitoring for and receiving the DCI from the PSCell.
  • the monitoring configuration may include a configured duration that the UE monitors for the DCI, an indication of a CORESET and/or search space where the UE monitors for the DCI, or a combination thereof.
  • the PSCell may also receive the monitoring configuration (e.g., from the master node in the MCG) to identify when and where to transmit the DCI or may signal the monitoring configuration to the UE (e.g., via the master node) .
  • the UE may receive one or more parameters for the preconfigured uplink message (e.g., via RRC signaling) , where the one or more parameters include a periodicity, a frequency location, a number of repetitions, a CORESET configuration, a search space configuration, a frequency hopping configuration, a modulation and coding scheme (MCS) , a transmission configuration indicator (TCI) , or a combination thereof for transmitting (e.g., and receiving at the PSCell) the preconfigured uplink message.
  • the one or more parameters include a periodicity, a frequency location, a number of repetitions, a CORESET configuration, a search space configuration, a frequency hopping configuration, a modulation and coding scheme (MCS) , a transmission configuration indicator (TCI) , or a combination thereof for transmitting (e.g., and receiving at the PSCell) the preconfigured uplink message.
  • MCS modulation and coding scheme
  • TCI transmission configuration indicator
  • the apparatus may include a processor, memory coupled with the processor, and instructions stored in the memory.
  • the instructions may be executable by the processor to cause the apparatus to identify a configuration for communicating with an MCG and an SCG, receive, from a master node in the MCG, a release message indicating a suspension of communications with the SCG, transmit an uplink message to a PSCell of the SCG after the communications have been suspended with the SCG, and monitor a BWP for DCI from the PSCell of the SCG, the DCI including a TA parameter for the communications with the SCG.
  • various DC deployments may be referred to as evolved universal mobile telecommunication system terrestrial radio access (E-UTRA) new radio (NR) -dual connectivity (EN-DC) , NR E-UTRA-DC (NE-DC) , NR NR-DC, LTE LTE-DC, or may include other types of multi-radio access technology-dual connectivity (MR-DC) deployments based on the RAT implemented by each cell.
  • E-UTRA evolved universal mobile telecommunication system terrestrial radio access
  • NR E-UTRA-DC NR E-UTRA-DC
  • NR NR-DC NR NR-DC
  • LTE LTE-DC Long Term Evolution-DC
  • MR-DC multi-radio access technology-dual connectivity
  • the UE may monitor for the DCI and corresponding TA information.
  • the UE may be allowed to monitor for the corresponding DCI in a dormant bandwidth part (BWP) for one RRC configured duration (e.g., network configures the duration that the UE monitors for the DCI via RRC signaling) .
  • BWP dormant bandwidth part
  • the UE may be configured by RRC with a dedicated control resource set (CORESET) and/or a dedicated search space to monitor for the DCI.
  • CORESET dedicated control resource set
  • One or more of the base stations 105 described herein may include or may be referred to by a person having ordinary skill in the art as a base transceiver station, a radio base station, an access point, a radio transceiver, a NodeB, an eNodeB (eNB) , a next-generation NodeB or a giga-NodeB (either of which may be referred to as a gNB) , a Home NodeB, a Home eNodeB, or other suitable terminology.
  • a base transceiver station a radio base station
  • an access point a radio transceiver
  • a NodeB an eNodeB (eNB)
  • eNB eNodeB
  • a next-generation NodeB or a giga-NodeB either of which may be referred to as a gNB
  • gNB giga-NodeB
  • Signal waveforms transmitted over a carrier may be made up of multiple subcarriers (e.g., using multi-carrier modulation (MCM) techniques such as orthogonal frequency division multiplexing (OFDM) or discrete Fourier transform spread OFDM (DFT-S-OFDM) ) .
  • MCM multi-carrier modulation
  • OFDM orthogonal frequency division multiplexing
  • DFT-S-OFDM discrete Fourier transform spread OFDM
  • a resource element may consist of one symbol period (e.g., a duration of one modulation symbol) and one subcarrier, where the symbol period and subcarrier spacing are inversely related.
  • the number of bits carried by each resource element may depend on the modulation scheme (e.g., the order of the modulation scheme, the coding rate of the modulation scheme, or both) .
  • Time intervals of a communications resource may be organized according to radio frames each having a specified duration (e.g., 10 milliseconds (ms) ) .
  • Each radio frame may be identified by a system frame number (SFN) (e.g., ranging from 0 to 1023) .
  • SFN system frame number
  • one or more of the UEs 115 may monitor or search control regions for control information according to one or more search space sets, and each search space set may include one or multiple control channel candidates in one or more aggregation levels arranged in a cascaded manner.
  • An aggregation level for a control channel candidate may refer to a number of control channel resources (e.g., control channel elements (CCEs) ) associated with encoded information for a control information format having a given payload size.
  • Search space sets may include common search space sets configured for sending control information to multiple UEs 115 and UE-specific search space sets for sending control information to a specific UE 115.
  • Such cells may range from smaller areas (e.g., a structure, a subset of structure) to larger areas depending on various factors such as the capabilities of the base station 105.
  • a cell may be or include a building, a subset of a building, or exterior spaces between or overlapping with geographic coverage areas 110, among other examples.
  • a macro cell generally covers a relatively large geographic area (e.g., several kilometers in radius) and may allow unrestricted access by the UEs 115 with service subscriptions with the network provider supporting the macro cell.
  • a small cell may be associated with a lower-powered base station 105, as compared with a macro cell, and a small cell may operate in the same or different (e.g., licensed, unlicensed) frequency bands as macro cells.
  • the wireless communications system 100 may be configured to support ultra-reliable communications or low-latency communications, or various combinations thereof.
  • the wireless communications system 100 may be configured to support ultra-reliable low-latency communications (URLLC) or mission critical communications.
  • the UEs 115 may be designed to support ultra-reliable, low-latency, or critical functions (e.g., mission critical functions) .
  • Ultra-reliable communications may include private communication or group communication and may be supported by one or more mission critical services such as mission critical push-to-talk (MCPTT) , mission critical video (MCVideo) , or mission critical data (MCData) .
  • MCPTT mission critical push-to-talk
  • MCVideo mission critical video
  • MCData mission critical data
  • Support for mission critical functions may include prioritization of services, and mission critical services may be used for public safety or general commercial applications.
  • the terms ultra-reliable, low-latency, mission critical, and ultra-reliable low-latency may be used interchangeably herein.
  • Some of the network devices may include subcomponents such as an access network entity 140, which may be an example of an access node controller (ANC) .
  • Each access network entity 140 may communicate with the UEs 115 through one or more other access network transmission entities 145, which may be referred to as radio heads, smart radio heads, or transmission/reception points (TRPs) .
  • Each access network transmission entity 145 may include one or more antenna panels.
  • various functions of each access network entity 140 or base station 105 may be distributed across various network devices (e.g., radio heads and ANCs) or consolidated into a single network device (e.g., a base station 105) .
  • the wireless communications system 100 may utilize both licensed and unlicensed radio frequency spectrum bands.
  • the wireless communications system 100 may employ License Assisted Access (LAA) , LTE-Unlicensed (LTE-U) radio access technology, or NR technology in an unlicensed band such as the 5 GHz industrial, scientific, and medical (ISM) band.
  • LAA License Assisted Access
  • LTE-U LTE-Unlicensed
  • NR NR technology
  • an unlicensed band such as the 5 GHz industrial, scientific, and medical (ISM) band.
  • devices such as the base stations 105 and the UEs 115 may employ carrier sensing for collision detection and avoidance.
  • operations in unlicensed bands may be based on a carrier aggregation configuration in conjunction with component carriers operating in a licensed band (e.g., LAA) .
  • Operations in unlicensed spectrum may include downlink transmissions, uplink transmissions, P2P transmissions, or D2D transmissions, among other examples.
  • a base station 105 or a UE 115 may be equipped with multiple antennas, which may be used to employ techniques such as transmit diversity, receive diversity, multiple-input multiple-output (MIMO) communications, or beamforming.
  • the antennas of a base station 105 or a UE 115 may be located within one or more antenna arrays or antenna panels, which may support MIMO operations or transmit or receive beamforming.
  • one or more base station antennas or antenna arrays may be co-located at an antenna assembly, such as an antenna tower.
  • antennas or antenna arrays associated with a base station 105 may be located in diverse geographic locations.
  • a base station 105 may have an antenna array with a number of rows and columns of antenna ports that the base station 105 may use to support beamforming of communications with a UE 115.
  • a UE 115 may have one or more antenna arrays that may support various MIMO or beamforming operations.
  • an antenna panel may support radio frequency beamforming for a signal transmitted via an antenna port.
  • Beamforming which may also be referred to as spatial filtering, directional transmission, or directional reception, is a signal processing technique that may be used at a transmitting device or a receiving device (e.g., a base station 105, a UE 115) to shape or steer an antenna beam (e.g., a transmit beam, a receive beam) along a spatial path between the transmitting device and the receiving device.
  • Beamforming may be achieved by combining the signals communicated via antenna elements of an antenna array such that some signals propagating at particular orientations with respect to an antenna array experience constructive interference while others experience destructive interference.
  • a base station 105 or a UE 115 may use beam sweeping techniques as part of beam forming operations.
  • a base station 105 may use multiple antennas or antenna arrays (e.g., antenna panels) to conduct beamforming operations for directional communications with a UE 115.
  • Some signals e.g., synchronization signals, reference signals, beam selection signals, or other control signals
  • the base station 105 may transmit a signal according to different beamforming weight sets associated with different directions of transmission.
  • Transmissions in different beam directions may be used to identify (e.g., by a transmitting device, such as a base station 105, or by a receiving device, such as a UE 115) a beam direction for later transmission or reception by the base station 105.
  • a transmitting device such as a base station 105
  • a receiving device such as a UE 115
  • Some signals may be transmitted by a base station 105 in a single beam direction (e.g., a direction associated with the receiving device, such as a UE 115) .
  • the beam direction associated with transmissions along a single beam direction may be determined based on a signal that was transmitted in one or more beam directions.
  • a UE 115 may receive one or more of the signals transmitted by the base station 105 in different directions and may report to the base station 105 an indication of the signal that the UE 115 received with a highest signal quality or an otherwise acceptable signal quality.
  • the base station 105 may transmit a reference signal (e.g., a cell-specific reference signal (CRS) , a channel state information reference signal (CSI-RS) ) , which may be precoded or unprecoded.
  • a reference signal e.g., a cell-specific reference signal (CRS) , a channel state information reference signal (CSI-RS)
  • CRS cell-specific reference signal
  • CSI-RS channel state information reference signal
  • the UE 115 may provide feedback for beam selection, which may be a precoding matrix indicator (PMI) or codebook-based feedback (e.g., a multi-panel type codebook, a linear combination type codebook, a port selection type codebook) .
  • PMI precoding matrix indicator
  • codebook-based feedback e.g., a multi-panel type codebook, a linear combination type codebook, a port selection type codebook
  • a receiving device may try multiple receive configurations (e.g., directional listening) when receiving various signals from the base station 105, such as synchronization signals, reference signals, beam selection signals, or other control signals.
  • receive configurations e.g., directional listening
  • a receiving device may try multiple receive directions by receiving via different antenna subarrays, by processing received signals according to different antenna subarrays, by receiving according to different receive beamforming weight sets (e.g., different directional listening weight sets) applied to signals received at multiple antenna elements of an antenna array, or by processing received signals according to different receive beamforming weight sets applied to signals received at multiple antenna elements of an antenna array, any of which may be referred to as “listening” according to different receive configurations or receive directions.
  • receive beamforming weight sets e.g., different directional listening weight sets
  • a receiving device may use a single receive configuration to receive along a single beam direction (e.g., when receiving a data signal) .
  • the single receive configuration may be aligned in a beam direction determined based on listening according to different receive configuration directions (e.g., a beam direction determined to have a highest signal strength, highest signal-to-noise ratio (SNR) , or otherwise acceptable signal quality based on listening according to multiple beam directions) .
  • SNR signal-to-noise ratio
  • the wireless communications system 100 may be a packet-based network that operates according to a layered protocol stack.
  • communications at the bearer or Packet Data Convergence Protocol (PDCP) layer may be IP-based.
  • a Radio Link Control (RLC) layer may perform packet segmentation and reassembly to communicate over logical channels.
  • RLC Radio Link Control
  • a Medium Access Control (MAC) layer may perform priority handling and multiplexing of logical channels into transport channels.
  • the MAC layer may also use error detection techniques, error correction techniques, or both to support retransmissions at the MAC layer to improve link efficiency.
  • the UEs 115 and the base stations 105 may support retransmissions of data to increase the likelihood that data is received successfully.
  • Hybrid automatic repeat request (HARQ) feedback is one technique for increasing the likelihood that data is received correctly over a communication link 125.
  • HARQ may include a combination of error detection (e.g., using a cyclic redundancy check (CRC) ) , forward error correction (FEC) , and retransmission (e.g., automatic repeat request (ARQ) ) .
  • FEC forward error correction
  • ARQ automatic repeat request
  • HARQ may improve throughput at the MAC layer in poor radio conditions (e.g., low signal-to-noise conditions) .
  • a UE 115 attempting to access a wireless network may perform an initial cell search by detecting a primary synchronization signal (PSS) from a base station 105.
  • PSS primary synchronization signal
  • the UE 115 may then receive a secondary synchronization signal (SSS) .
  • SSS secondary synchronization signal
  • the SSS may enable radio frame synchronization, and may provide a cell identity value, which may be combined with the physical layer identity value to identify the cell.
  • the SSS may also enable detection of a duplexing mode and a cyclic prefix length.
  • Some systems, such as TDD systems may transmit an SSS but not a PSS. Both the PSS and the SSS may be located in the central 62 and 72 subcarriers of a carrier, respectively.
  • a base station 105 may transmit synchronization signals (e.g., PSS SSS, and the like) using multiple beams in a beam-sweeping manner through a cell coverage area.
  • PSS, SSS, and/or broadcast information e.g., a physical broadcast channel (PBCH)
  • PBCH physical broadcast channel
  • SS synchronization signal
  • the UE 115 may receive an MIB, which may be transmitted in the PBCH.
  • the MIB may contain system bandwidth information, an SFN, and a physical HARQ indicator channel (PHICH) configuration.
  • the UE 115 may receive one or more SIBs.
  • SIB1 may contain cell access parameters and scheduling information for other SIBs. Decoding SIB1 may enable the UE 115 to receive SIB2.
  • SIB2 may contain RRC configuration information related to random access channel (RACH) procedures, paging, physical uplink control channel (PUCCH) , PUSCH, power control, SRS, and cell barring.
  • a UE 115 may decode the MIB, SIB1 and SIB2 prior to accessing the network.
  • the MIB may be transmitted on PBCH and may utilize the first 4 OFDMA symbols of the second slot of the first subframe of each radio frame. It may use the middle 6 RBs (72 subcarriers) in the frequency domain.
  • the MIB carries a few important pieces of information for UE initial access, including: downlink channel bandwidth in term of RBs, PHICH configuration (duration and resource assignment) , and SFN.
  • the UE 115 may try different phases of a scrambling code until it gets a successful CRC check.
  • the phase of the scrambling code (0, 1, 2 or 3) may enable the UE 115 to identify which of the four repetitions has been received.
  • the UE 115 may determine the current SFN by reading the SFN in the decoded transmission and adding the scrambling code phase.
  • a UE may receive one or more SIBs. Different SIBs may be defined according to the type of system information conveyed.
  • the UE 115 may transmit a RACH preamble to a base station 105.
  • the RACH preamble may be randomly selected from a set of 64 predetermined sequences. This may enable the base station 105 to distinguish between multiple UEs 115 trying to access the system simultaneously.
  • the base station 105 may respond with a random access response that provides an uplink resource grant, a timing advance, and a temporary C-RNTI.
  • the UE 115 may then transmit an RRC connection request along with a temporary mobile subscriber identity (TMSI) (if the UE 115 has previously been connected to the same wireless network) or a random identifier.
  • TMSI temporary mobile subscriber identity
  • the RRC connection request may also indicate the reason the UE 115 is connecting to the network (e.g., emergency, signaling, data exchange, etc. ) .
  • the base station 105 may respond to the connection request with a contention resolution message addressed to the UE 115, which may provide a new C-RNTI. If the UE 115 receives a contention resolution message with the correct identification, it may proceed with RRC setup. If the UE 115 does not receive a contention resolution message (e.g., if there is a conflict with another UE 115) it may repeat the RACH process by transmitting a new RACH preamble.
  • Such exchange of messages between the UE 115 and base station 105 for random access may be referred to as a four-step RACH procedure.
  • a UE 115 may be in various states (e.g., RRC states) of being connected to a base station 105 or the network.
  • the UE 115 may operate in an idle communication state (e.g., a radio resource control (RRC) idle state) , where the UE 115 may be “on standby” and thus, may not be assigned to a particular serving base station.
  • the UE 115 may operate in a connected communication state (e.g., an RRC connected state) where the UE 115 may be “active” and transmit data to/receive data from a serving cell.
  • the UE 115 may accordingly transition from the RRC idle state to the RRC connected state, and vice versa, based on its activity.
  • an additional state may be used for the UE 115 that is an intermediary between the idle communication state and the connected communication state.
  • an inactive communication state e.g., an RRC inactive state
  • an RRC inactive state between the connected communication state and the idle communication state may be used to enable transitions from the inactive communication state to the connected communication state with reduced latency (e.g., as compared to the transition from the idle communication state to the connected communication state) .
  • a UE context e.g., an AS context
  • the network e.g., the base station 105, the RAN, etc.
  • both the UE 115 and network may further store higher-layer configurations (e.g., for respective cells of DC/CA deployments) while simultaneously releasing lower-layer configurations (as the lower-layer configurations may change, for example, due to the UE’s mobility) . Then, when resuming communications with the network and moving out of the inactive communication state, the UE 115 may apply the stored higher-layer configurations.
  • higher-layer configurations e.g., for respective cells of DC/CA deployments
  • lower-layer configurations may change, for example, due to the UE’s mobility
  • the UE 115 may not be able to operate using the previously-established DC and/or CA schemes immediately after leaving the inactive communication state. For example, the UE 115 may not maintain a TA for cells in an SCG (e.g., PSCell, SCells for the SCG, etc. ) when the lower-layer configurations are released. As such, if the UE 115 attempts to communicate with the cells in the SCG, uplink messages transmitted by the UE 115 may be received at the cells in the SCG outside of TTI boundaries (e.g., subframes, frames, etc. ) , across TTI boundaries, etc., such that the cells are unable to correctly process the uplink messages.
  • TTI boundaries e.g., subframes, frames, etc.
  • a master node of an MCG for the UE 115 may transmit TA information for the cells of the SCG when the communications with the SCG are reactivated, or the UE 115 may need to decode additional downlink messages from the cells of the SCG and to transmit an acknowledgment message back to the cells of the SCG to determine and use a TA for the cells of the SCG. Accordingly, in both cases, by decoding the downlink messages from the master node and/or cells of the SCG and transmitting acknowledgment feedback before using the TA, the UE 115 may increase latency and signaling overhead in order to use a TA to communicate with the cells of the SC.
  • Wireless communications system 100 may support efficient techniques for a UE 115 communicating with both an MCG and an SCG to transmit an uplink message to a PSCell of the SCG after communications with the SCG have been suspended, where the PSCell responds with DCI that includes TA information for the UE 115 to use for subsequent communications with the SCG.
  • the UE may transmit a PRACH preamble message (e.g., random access message) to the PSCell to reestablish communications with the SCG, and the PSCell may respond with DCI that includes TA information for aligning the subsequent uplink messages.
  • a PRACH preamble message e.g., random access message
  • the UE may transmit a preconfigured uplink message (e.g., a preconfigured PUSCH) to the PSCell, and the PSCell may respond with a DCI to acknowledge the preconfigured uplink message was successfully received and decoded, where the DCI includes the TA information.
  • the DCI transmitted by the PSCell may be scrambled with a C-RNTI for the UE 115, a TA-RNTI, an RA-RNTI, an RNTI corresponding to a configured CORESET and/or search space for the UE 115, or a combination thereof.
  • the UE 115 may receive a configuration for transmitting/monitoring for the DCI, transmitting/receiving the preconfigured uplink message, etc. (e.g., via RRC signaling) .
  • FIG. 2 illustrates an example of a wireless communications system 200 that supports TA control in DCI for SCG suspension in accordance with aspects of the present disclosure.
  • wireless communications system 200 may implement aspects of wireless communications system 100.
  • wireless communications system 200 includes a first base station 105-a, a second base station 105-b, and a UE 115-a, which may be examples of the corresponding devices described with reference to FIG. 1.
  • Wireless communications system 200 may support the use of techniques that enhance the resumption of communications in CA and DC deployments after a UE leaves an RRC inactive state.
  • a UE 115-a may communicate with a network using a DC configuration.
  • UE 115-a may simultaneously communicate with different base stations 105 (e.g., first base station 105-a and second base station 105-b) .
  • First base station 105-a may provide a first cell 205-a and first base station 105-a may be referred to as a master node.
  • First cell 205-a may correspond to a PCell in the DC deployment.
  • second base station 105-b may provide a second cell 205-b of the DC configuration, and second base station 105-b may be referred to as a secondary node.
  • second cell 205-b may correspond to a PSCell in the DC deployment, which may be configured with time-frequency resources for PUCCH.
  • Additional SCells may associated with each base station 105-a and 105-b, where a set of cells (e.g., SCells) associated with the master node may correspond to a master cell group (MCG) and another set of SCells associated with the secondary node may correspond to a secondary cell group (SCG) .
  • MCG master cell group
  • SCG secondary cell group
  • the different base stations 105 and corresponding cells of the DC deployment may be associated with a same or different RAT.
  • first base station 105-a and second base station 105-b may communicate using a first RAT and a second RAT, respectively.
  • the first RAT and/or the second RAT may be the same or different and may include, for example, LTE, NR, or another RAT.
  • various DC deployments may sometimes be referred to as EN-DC, NE-DC, NR NR-DC, LTE LTE-DC, enhanced LTE (eLTE) eLTE-DC, or may include other types of MR-DC deployments based on the RAT that is used by each base station 105.
  • the different cells of a DC deployment may use the same or different RF spectrum bands for communication with UE 115-a.
  • DC deployments may use different radio bearers for transmitted messages for each cell.
  • first base station 105-a when first base station 105-a is configured as a master node that provides a set of serving cells corresponding to the MCG, first base station 105-a may use a first set of signaling radio bearers (SRBs) (e.g., SRB1, SRB2) to transport messages for the MCG, such as RRC messages.
  • SRBs signaling radio bearers
  • second base station 105-b may provide another set of serving cells that correspond to the SCG and may use a second set of SRBs (e.g., SRB3) to transport messages for the SCG.
  • SRBs signaling radio bearers
  • a split bearer configuration may be supported, where a particular protocol layer (e.g., a packet data convergence protocol (PDCP) layer) for both the master node and secondary node may be used to route data streams to/from UE 115-a.
  • a particular protocol layer e.g., a packet data convergence protocol (PDCP) layer
  • PDCP packet data convergence protocol
  • an SRB e.g., SRB1/SRB2
  • downlink messages sent from the master node to UE 115-a may be routed via lower-layers (e.g., radio link control (RLC) , medium access control (MAC) , physical (PHY) , etc.
  • RLC radio link control
  • MAC medium access control
  • PHY physical
  • first base station 105-a e.g., the master node
  • second base station 105-b e.g., the secondary node
  • downlink messages may be routed via the lower-layers of both the master and secondary nodes.
  • RRC messages from UE 115-a may be transmitted to the master node via the secondary node using the split bearer (e.g., via a “leg” associated with the secondary node) .
  • the split bearer e.g., via a “leg” associated with the secondary node
  • respective data radio bearers may be used by the MCG and SCG.
  • UE 115-a may communicate with a single base station 105 (e.g., first base station 105-a) using multiple carriers (e.g., CCs, which may also be referred to as layers, channels, etc. ) .
  • CCs may refer to each of the carriers used by UE 115-a in CA operations.
  • a serving cell of first base station 105-a may correspond to each CC used in CA operation, where each serving cell may be different (e.g., based on the path loss experienced by different CCs on different RF spectrum bands) .
  • one carrier may be designated as a primary carrier, or primary CC (PCC) , for UE 115-a, which may be served by a PCell of first base station 105-a.
  • Additional carriers may be designated as secondary carriers, or secondary CCs (SCCs) , which may be served by SCells of first base station 105-a.
  • CA operations may use the same or different RF bands for communications.
  • UE 115-a may operate in different RRC states when communicating with one or more base stations 105. For instance, and as illustrated by state diagram 210, UE 115-a may operate in an RRC connected state 215 where UE 115-a may be “active” and transmit data to/receive data from a serving cell. Additionally, UE 115-a may operate in an RRC idle state 220, in which case UE 115-a may be “on standby” and thus, may not be assigned to a particular serving base station 105 while saving power.
  • radio bearers for the system may be released (e.g., to avoid re-routing should UE 115-a move to another cell) , but UE 115-a may still perform various functions, such as cell reselection and discontinuous reception (DRX) for page messages, among other functions.
  • UE 115-a may accordingly transition from the RRC idle state 220 to the RRC connected state 215, and vice versa, based on its activity.
  • UE 115-a may transmit, to a base station 105, a setup request message (e.g., RRCSetupRequest) .
  • UE 115-a may receive a release message (e.g., RRCRelease) .
  • UE 115-a may support an additional RRC state.
  • an RRC inactive state 225 between the RRC connected state 215 and the RRC idle state 220 may be used to enable a faster transition to the RRC connected state 215 (e.g., as compared to the state transition from the RRC idle state 220 to the RRC connected state 215) .
  • UE 115-a When UE 115-a is in the RRC inactive state 225, it may receive system information, perform cell measurements, and perform other functions.
  • UE 115-a may transition to the RRC connected state 215 from the RRC inactive state 225 when downlink data is available for UE 115-a, or UE 115-a has uplink data to transmit, or both, and UE 115-a may accordingly transmit a resume request message (e.g., RRCResumeRequest) to resume communications with a base station 105.
  • UE 115-a may receive a release message (e.g., RRCRelease) from a base station 105.
  • UE 115-a may receive a release message from the base station 105.
  • a UE context (e.g., an AS context) may be retained at UE 115-a and the network, and both UE 115-a and the network may store higher-layer configurations (e.g., for a DC/CA deployment) while simultaneously releasing lower-layer configurations (as the lower-layer configurations may change, for example, due to UE 115-a being mobile (i.e., non-stationary) ) .
  • UE 115-a, first base station 105-a (e.g., providing the MCG) , and second base station 105-b (e.g., providing the SCG) may store PDCP/SDAP configurations for both MCG and SCG when UE 115-a transitions to the RRC inactive state 225. Additionally, UE 115-a may release lower-layer configurations for both the MCG and SCG when in the RRC inactive state 225.
  • UE 115-a may apply the stored upper-layer (PDCP and/or SDAP) configurations of the MCG and SCG.
  • PDCP and/or SDAP stored upper-layer
  • UE 115-a may not be able to immediately operate using DC (or CA) communications after transitioning from the RRC inactive state 225.
  • UE 115-a may later require multiple reconfiguration messages (e.g., RRC reconfiguration messages) to obtain a full configuration, including the lower-layer configurations for the MCG and SCG (and any updates thereto) , to establish communication with first base station 105-a and/or second base station 105-b (or another, different, base station 105) of the DC deployment.
  • UE 115-a may require additional downlink messages and be required to transmit acknowledgment messages to decode and use a TA for communicating with the SCG.
  • This signaling overhead may reduce efficiency in the system through added delays in resuming and/or modifying the DC configuration that UE 115-a operated with prior to entering into the RRC inactive state 225.
  • CA operations may be similarly affected when transitioning out of the RRC inactive state 225.
  • UE 115-a may transmit a random access message (e.g., PRACH preamble) to second base station 105-b to reestablish communications with the SCG, and second base station 105-b may respond with DCI that includes TA information for aligning the subsequent uplink messages.
  • a random access message e.g., PRACH preamble
  • UE 115-a may transmit a preconfigured uplink message (e.g., a preconfigured PUSCH) to second base station 105-b, and second base station 105-b may respond with a DCI to acknowledge the preconfigured uplink message was successfully received and decoded, where the DCI includes the TA information.
  • the DCI transmitted by second base station 105-b may be scrambled with a C-RNTI for UE 115-a, a TA-RNTI, an RA-RNTI, an RNTI corresponding to a configured CORESET and/or search space for UE 115-a, or a combination thereof.
  • UE 115-a may receive a configuration for transmitting/monitoring for the DCI, transmitting/receiving the preconfigured uplink message, etc. (e.g., via RRC signaling) .
  • aspects of the present disclosure are described in the context of DC deployments (e.g., NE-DC, EN-DC, or the like) when UE 115-a resumes communications from the RRC inactive state 225; however, the techniques may be applicable to other deployments and configurations not explicitly described herein. For example, the described techniques may also be applicable to CA configurations when UE 115-a transitions out of the RRC inactive state 225. Additionally or alternatively, the described techniques may be applicable to scenarios where UE 115-a is connected with a single base station to efficiently set up DC or CA when UE 115-a resumes communications from an RRC inactive state 225.
  • DC deployments e.g., NE-DC, EN-DC, or the like
  • FIG. 3 illustrates an example of a wireless communications system 300 that supports TA control in DCI for SCG suspension in accordance with aspects of the present disclosure.
  • wireless communications system 300 may implement aspects of wireless communications systems 100 and/or 200.
  • wireless communications system 300 includes a first base station 105-c, a second base station 105-d, and a UE 115-b, which may be examples of the corresponding devices described with reference to FIGs. 1 and 2.
  • UE 115-b may communicate with first base station 105-c on resources of a carrier 305 and communicate with second base station 105-d on resources of a carrier 310.
  • first base station 105-c and second base station 105-d may communicate with each other via a backhaul link 120-a.
  • Wireless communications system 300 may support the use of techniques that enhance the resumption of communications in CA and DC deployments after a UE leaves an RRC inactive state, including determining a TA to use for resuming the communications.
  • UE 115-b may be in communications with both first base station 105-c and second base station 105-d, where first base station 105-c represents a master node/MCG and base station 105-d represents a secondary node/SCG. Additionally, first base station 105-c may provide a first cell (e.g., a PCell) for communicating with UE 115-b, and second base station 105-d may provide a second cell (e.g., a PSCell) for communicating with UE 115-b. First base station 105-c and second base station 105-d may also provide additional cells (e.g., SCells) to support communications with UE 115-b.
  • first cell e.g., a PCell
  • second base station 105-d may provide a second cell (e.g., a PSCell) for communicating with UE 115-b.
  • First base station 105-c and second base station 105-d may also provide additional cells (e.g.,
  • UE 115-b may suspend communications with second base station 105-d (e.g., the SCG) based on a determination made by first base station 105-c.
  • first base station 105-c may determine to suspend SCG communications for UE 115-b based on measurement reports from UE 115-b (e.g., indicating the communications with second base station 105-d are deteriorating) , to save power at UE 115-b by not communicating with two base stations 105/cells at the same time, communications with both base stations 105 is not needed, etc.
  • first base station 105-c may then transmit indications or requests to both second base station 105-d (e.g., via backhaul link 120-a) and to UE 115-b (e.g., via carrier 305) for suspending the SCG communications.
  • first base station 105-c may transmit an SCG suspend request 315-a to second base station 105-d via backhaul link 120-a and may transmit an SCG suspend request 315-b to UE 115-b via carrier 305.
  • UE 115-b may place the SCG into dormancy, including second base station 105-d (e.g., PSCell) .
  • UE 115-b may store configurations for the SCG but may not monitor downlink channels (e.g., physical downlink control channels (PDCCHs) ) of cells (e.g., PSCell and SCell (s) ) of the SCG.
  • downlink channels e.g., physical downlink control channels (PDCCHs)
  • cells e.g., PSCell and SCell (s)
  • the dedicated PRACH preamble may include a dedicated preamble (e.g., that indicates for second base station 105-d to transmit DCI with TA information 325 based on receiving the dedicated PRACH preamble) or a dedicated time/frequency/beam resource location for transmitting the PRACH preamble.
  • a dedicated preamble e.g., that indicates for second base station 105-d to transmit DCI with TA information 325 based on receiving the dedicated PRACH preamble
  • a dedicated time/frequency/beam resource location for transmitting the PRACH preamble.
  • UE 115-b may be configured by RRC (e.g., from first base station 105-c, master node, MCG, etc. ) with a dedicated CORESET and/or a dedicated search space (e.g., dedicated for UE 115-b) where UE 115-b is to monitor for the DCI with TA information 325.
  • RRC e.g., from first base station 105-c, master node, MCG, etc.
  • a dedicated search space e.g., dedicated for UE 115-b
  • second base station 105-d may also receive an indication of the dedicated CORESET and/or dedicated search space (e.g., via backhaul link 120-a) to identify where to transmit DCI with TA information 325 for UE 115-b to receive the DCI.
  • second base station 105-d may determine the CORESET and/or search space for UE 115-b to monitor and receive the DCI and may transmit an indication of the CORESET and/or search space (e.g., directly to UE 115-b, through first base station 105-c, etc. ) .
  • second base station 105-d may scramble the DCI with a C-RNTI specific to UE 115-b, with a dedicated RNTI for including the TA information (e.g., a TA-RNTI) , with an RNTI for the random access procedure (e.g., an RA-RNTI, with an RNTI that corresponds to (e.g., mapping from) the configured CORESET and/or search space for UE 115-b to monitor for DCI with TA information 325.
  • a dedicated RNTI for including the TA information (e.g., a TA-RNTI)
  • an RNTI for the random access procedure e.g., an RA-RNTI, with an RNTI that corresponds to (e.g., mapping from) the configured CORESET and/or search space for UE 115-b to monitor for DCI with TA information 325.
  • the PSCell e.g., second base station 105-d
  • the PSCell may send DCI with TA information 325 (e.g., as an acknowledgment message) in a dormant BWP of the PSCell.
  • UE 115-b may receive an RRC configuration (e.g., from first base station 105-c, master node, MCG, etc.
  • UE 115-b may monitor for the corresponding DCI (e.g., as the acknowledgment message) in the dormant BWP for one RRC configured duration as described above. For example, if the duration expires and no DCI (e.g., as the acknowledgment message) is received, UE 115-b may retransmit the preconfigured PUSCH to receive the TA information. Additionally, UE 115-b may be configured by RRC with a dedicated CORESET and/or a dedicated search space to monitor for DCI with TA information 325 (e.g., as the acknowledgment message) .
  • second base station 105-d may scramble the DCI with the C-RNTI specific to UE 115-b, with the dedicated RNTI for including the TA information (e.g., a TA-RNTI) , with an RNTI that corresponds to (e.g., mapping from) the configured CORESET and/or search space for UE 115-b to monitor for DCI with TA information 325.
  • the dedicated RNTI for including the TA information (e.g., a TA-RNTI)
  • an RNTI that corresponds to (e.g., mapping from) the configured CORESET and/or search space for UE 115-b to monitor for DCI with TA information 325.
  • the TA information may be a set of bits (e.g., six (6) bits) .
  • the DCI format and payload design may vary based on the type of RNTI used by second base station 105-d for scrambling the DCI. For example, when the C-RNTI is used to scramble the DCI, a new DCI format may be defined that contains the TA field. Accordingly, the DCI size may be matched with that of a fallback DCI (e.g., DCI format 1_0, DCI format 0_0, etc. ) for the cell where the DCI is monitored by adding reserved bits.
  • a fallback DCI e.g., DCI format 1_0, DCI format 0_0, etc.
  • matching the DCI size to the fallback DCI may assume that this DCI (e.g., DCI with TA information 325 from second base station 105-d) is monitored and the existing fallback DCI is not monitored in the serving cell (e.g., from first base station 105-c) as UE 115-b is not able to differentiate between the two DCIs. Additionally or alternatively, the DCI size for DCI with TA information 325 may not be matched with the fallback DCI size in the serving cell. In some cases, a DCI size budget (e.g., up to three (3) DCI sizes when using the C-RNTI and a total four (4) DCI sizes for all RNTIs) may not be increased after this new DCI is not defined.
  • this DCI e.g., DCI with TA information 325 from second base station 105-d
  • the existing fallback DCI is not monitored in the serving cell (e.g., from first base station 105-c) as UE 115-b is not able
  • fields of an existing fallback DCI may be repurposed for DCI with TA information 325.
  • second base station 105-d may transmit DCI with TA information 325 based on a scheduling DCI and repurpose existing field (s) of the scheduling DCI.
  • second base station 105-d may repurpose the existing fields and/or may add at least one bit to indicate whether the DCI is used to carry the TA information.
  • an existing non-fallback DCI format e.g., DCI format 1_1, DCI format 0_1, etc.
  • second base station 105-d may be used when repurposing the existing fields of a DCI (e.g., scheduling DCI) to transmit DCI with TA information 325.
  • a DCI e.g., scheduling DCI
  • second base station 105-d may transmit DCI with TA information 325 based on a PDCCH order. For example, second base station 105-d may use reserved bits (e.g., 10 bits) in the PDCCH to carry the TA information. Additionally or alternatively, second base station 105-d may repurpose existing field (s) of the DCI.
  • the DCI size may be matched with the fallback DCI size (e.g., for DCI format 1_0, DCI format 0_0, etc. ) . Additionally or alternatively, the DCI size may not be matched with the fallback DCI size in the serving cell.
  • the dedicated RNTI e.g., TA-RNTI
  • the DCI size budget (e.g., up to three (3) DCI sizes for C-RNTI and total four (4) DCI sizes for all RNTIs) may not be increased, which may be similar to defining a new DCI format that contains the TA field/information and the PDCCH is scrambled by a C-RNTI.
  • reserved bits e.g., 16 bits
  • second base station 105-d may repurpose existing field (s) of the DCI (e.g., similar to PDCCH order) .
  • FIG. 4 illustrates an example of an SCG suspension process 400 that supports TA control in DCI for SCG suspension in accordance with aspects of the present disclosure.
  • SCG suspension process 400 may implement aspects of wireless communications systems 100, 200, and/or 300.
  • SCG suspension process 400 may include a UE 115-c, which may be an example of a UE 115 as described above with reference to FIGs. 1-3.
  • SCG suspension process 400 may include a master node (MN) 402 and a secondary node (SN) 403, which may be examples of base stations 105 as described above with reference to FIGs. 1-3.
  • MN master node
  • SN secondary node
  • UE 115-c may support communications with both master node 402 and secondary node 403 in a communications configuration that includes an MCG with master node 402 and an SCG with secondary node 403 (e.g., DC deployment, CA configuration, etc. ) .
  • a communications configuration that includes an MCG with master node 402 and an SCG with secondary node 403 (e.g., DC deployment, CA configuration, etc. ) .
  • master node 402 may transmit an SCG suspend request to secondary node 403 to suspend SCG communications between secondary node 403 and UE 115-c. Subsequently, at 410, secondary node 403 may transmit an SCG suspend complete message to master node 402.
  • master node 402 may transmit an SCG suspend indication 415 to UE 115-c.
  • master node 402 may use layer 1 (L1) signaling (e.g., DCI) to indicate UE 115- c to suspend SCG/secondary node for a while and reactivate the SCG/secondary node quickly.
  • L1 layer 1
  • UE 115-b may enter an SCG suspend state based on receiving the SCG suspend indication. Additionally, at 425, when the SCG is suspended, UE 115-c may put its SCG (e.g., including a PSCell, secondary node 403, etc. ) in dormancy for power saving purpose. Based on putting the SCG in dormancy, the SCG configuration may be stored in UE 115-c, but UE 115-c may not monitor PDCCH of PSCell/SCell of the SCG. In some cases, during the SCG suspension, UE 115-c may be configured to perform radio resource management (RRM) and channel state information (CSI) measurements for the SCG and may report measurement results of the SCG to master node 402.
  • RRM radio resource management
  • CSI channel state information
  • UE 115-c may transmit an SCG activation request to master node 402 for reactivating communications with secondary node 403 (e.g., to reactivate SCG communications) .
  • master node 402 may determine to activate communications between UE 115-c and the SCG (e.g., secondary node 403) .
  • master node 402 may determine to activate the SCG based on the activation request received from UE 115-c.
  • master node 402 may determine to reactivate the SCG communications based on measurement reports received from UE 115-c.
  • UE 115-c may have to decode a PDSCH for the TA information (e.g., TA command, TA control, etc. ) included in the RAR, and may also need to send a PUSCH to acknowledge the RAR.
  • TA information e.g., TA command, TA control, etc.
  • secondary node 403 may transmit DCI with the TA information after receiving the PRACH preamble.
  • FIG. 5 illustrates an example of a TA configuration 500 that supports TA control in DCI for SCG suspension in accordance with aspects of the present disclosure.
  • TA configuration 500 may implement aspects of wireless communications systems 100, 200, and/or 300.
  • TA configuration 500 may include a UE 115-d and a base station 105-e, which may be examples of UEs 115 and base stations 105, respectively, as described above with reference to FIGs. 1-4.
  • base station 105-e e.g., a secondary node, PSCell, SCG, second base station, etc.
  • base station 105-e may receive an uplink transmission 505 from UE 115-d based on a TA 510.
  • base station 105-e may transmit information for the TA 510 in DCI to UE 115-d based on receiving an uplink message (e.g., PRACH preamble, preconfigured PUSCH transmission, etc. ) .
  • an uplink message e.g., PR
  • UE 115-d may use TA 510 to transmit uplink transmission 505 at a time 515-a, such that the uplink transmission 505 is received at base station 105-e at a time 515-b.
  • time 515-b may correspond to a start of an uplink frame 520 for base station 105-e.
  • Uplink frame 520 may be a configured time interval where base station 105-e can receive uplink messages from different UEs 115 (e.g., including UE 115-d) .
  • Uplink frame 520 may include a duration of a frame, a subframe, or a different length TTI that base station 105-e can use for receiving uplink messages.
  • uplink frame 520 may last from time 515-b to a time 515-c. Based on TA 510, uplink transmission 505 may be received at base station 105-e at aligned times for base station 105-e.
  • TAs 510 may vary per UE 115 communicating with base station 105-e such that uplink transmissions received from each UE 115 are aligned with uplink frame 520 (e.g., so that base station 105-e is receiving multiple uplink messages at different times and/or outside durations that base station 105-e is able to receive uplink transmissions) .
  • the different UEs 115 may experience different propagation delays based on being farther away or closer to base station 105-e.
  • a single TA or multiple TAs may be configured per UE 115.
  • FIG. 6 illustrates an example of a process flow 600 that supports TA control in DCI for SCG suspension in accordance with aspects of the present disclosure.
  • process flow 600 may implement aspects of wireless communications systems 100, 200, and/or 300.
  • process flow 600 includes a UE 115-e, which may be an example of a UE 115 described with reference to FIGs. 1-5.
  • process flow 600 includes a master node (MN) 602 and a secondary node (SN) 603 which may be configured for operation in a DC deployment (e.g., and/or a CA configuration) with UE 115-e.
  • Master node 602 and secondary node 603 may each be an example of a base station 105 as described with reference to FIGs. 1-5.
  • Process flow 600 may illustrate a UE 115 transitioning from an inactive communication state (e.g., RRC inactive) and resuming communications within a DC deployment using TA information signaled by secondary node 603 (e.g., a PSCell) in DCI.
  • an inactive communication state e.g., RRC inactive
  • secondary node 603 e.g., a PSCell
  • the operations between UE 115-e, master node 602, and secondary node 603 may be performed in different orders or at different times. Certain operations may also be left out of the process flow 600, or other operations may be added to the process flow 600. It is to be understood that while UE 115-e, master node 602, and secondary node 603 are shown performing a number of the operations of process flow 600, any wireless device may perform the operations shown.
  • UE 115-e may identify a configuration for communicating with an MCG and an SCG. Additionally, secondary node 603 may identify a communication configuration with UE 115-e, where secondary node 603 includes a PSCell with respect to the communication configuration with UE 115-e.
  • secondary node 603 may receive, from master node 602 in the communication configuration, a release message indicating a suspension of secondary node communications (e.g., SCG communications) with UE 115-e, where the secondary node communications include the PSCell.
  • a suspension of secondary node communications e.g., SCG communications
  • UE 115-e may receive, from master node 602 in the MCG, a release message indicating a suspension of communications with the SCG (e.g., secondary node 603, PSCell, etc. ) .
  • UE 115-e may receive, via RRC signaling, a configuration for a preconfigured uplink message.
  • the configuration for the preconfigured uplink message may include a periodicity, a frequency location, a number of repetitions, a CORESET configuration, a search space configuration, a frequency hopping configuration, an MCS, a TCI, or a combination thereof for transmitting the preconfigured uplink message.
  • secondary node 603 may receive, from master node 602, an uplink channel configuration for receiving the preconfigured uplink message from UE 115-e.
  • the uplink channel configuration may include a periodic allocation of time resources, frequency resources, beam resource locations, or a combination thereof for receiving the preconfigured uplink message.
  • secondary node 603 may receive, from master node 602, a configuration for the preconfigured uplink message.
  • the configuration for the preconfigured uplink message may include the periodicity, the frequency location, the number of repetitions, the CORESET configuration, the search space configuration, the frequency hopping configuration, the MCS, the TCI, or a combination thereof for receiving the preconfigured uplink message.
  • UE 115-e may transmit an uplink message to the PSCell of the SCG after the communications have been suspended with the SCG.
  • secondary node 603 may receive, from UE 115-e, an uplink message after the communications have been suspended with UE 115-e.
  • secondary node 603 may receive, from UE 115-e, the preconfigured uplink message based on the uplink channel configuration.
  • UE 115-e may determine to reestablish the communications with the SCG after the communications have been suspended with the SCG and may transmit, to the PSCell of the SCG, a random access message (e.g., PRACH preamble) based on the determination.
  • a random access message e.g., PRACH preamble
  • the random access message may be a random access preamble dedicated to UE 115-e.
  • the random access message may be transmitted at a time resource, frequency resource, beam resource location, or a combination thereof dedicated to UE 115-e.
  • UE 115-e may receive an uplink channel configuration for transmitting the preconfigured uplink message and may transmit, to the PSCell of the SCG, the preconfigured uplink message based on the uplink channel configuration.
  • the uplink channel configuration may include a periodic allocation of time resources, frequency resources, beam resource locations, or a combination thereof.
  • UE 115-e may receive, via RRC signaling, a monitoring configuration for monitoring of a BWP for DCI, where the BWP is monitored for one configured duration based on the monitoring configuration. Additionally, UE 115-e may receive, via RRC signaling, a configuration of a CORESET, a search space, or a combination thereof dedicated to UE 115-e, where the BWP is monitored based on the configuration of the CORESET, the search space, or the combination thereof.
  • secondary node 603 may receive, from master node 602, a configuration of the CORESET, the search space, or the combination thereof dedicated to UE 115-e, where DCI is transmitted based on the configuration of the CORESET, the search space, or the combination thereof. Additionally or alternatively, secondary node 603 may transmit, to UE 115-e via RRC signaling, a configuration of the CORESET, the search space, or the combination thereof dedicated to UE 115-e, where DCI is transmitted based on the configuration of the CORESET, the search space, or the combination thereof.
  • secondary node 603 may transmit, to UE 115-e, DCI based on receiving the uplink message, where the DCI includes a TA parameter (e.g., TA information) for the communications with the SCG.
  • secondary node 603 may scramble the DCI with a C-RNTI for UE 115-e, a dedicated TA-RNTI, an RA-RNTI, an RNTI corresponding to the CORESET for UE 115-e, an RNTI corresponding to the search space for UE 115-e, or a combination thereof.
  • UE 115-e may monitor a BWP for the DCI from the PSCell of the SCG, where the DCI includes the TA parameter for the communications with the SCG. In some cases, UE 115-e may determine the one configured duration expires prior to receiving the DCI and may transmit, to the PSCell of the SCG, the uplink message an additional time (e.g., retransmission) based on the one configured duration expiring.
  • additional time e.g., retransmission
  • FIG. 7 shows a block diagram 700 of a device 705 that supports TA control transmission in DCI for SCG suspension in accordance with aspects of the present disclosure.
  • the device 705 may be an example of aspects of a UE 115 as described herein.
  • the device 705 may include a receiver 710, a UE communications manager 715, and a transmitter 720.
  • the device 705 may also include a processor. Each of these components may be in communication with one another (e.g., via one or more buses) .
  • the receiver 710 may receive information such as packets, user data, or control information associated with various information channels (e.g., control channels, data channels, and information related to TA control transmission in DCI for SCG suspension, etc. ) . Information may be passed on to other components of the device 705.
  • the receiver 710 may be an example of aspects of the transceiver 1020 described with reference to FIG. 10.
  • the receiver 710 may utilize a single antenna or a set of antennas.
  • the UE communications manager 715 may identify a configuration for communicating with a master cell group and a secondary cell group. In some cases, the UE communications manager 715 may receive, from a master node in the master cell group, a release message indicating a suspension of communications with the secondary cell group. Additionally, the UE communications manager 715 may transmit an uplink message to a primary secondary cell of the secondary cell group after the communications have been suspended with the secondary cell group. Subsequently, the UE communications manager 715 may monitor a bandwidth part for downlink control information from the primary secondary cell of the secondary cell group, the downlink control information including a timing advance parameter for the communications with the secondary cell group. The UE communications manager 715 may be an example of aspects of the UE communications manager 1010 described herein.
  • the UE communications manager 715 may be physically located at various positions, including being distributed such that portions of functions are implemented at different physical locations by one or more physical components.
  • the UE communications manager 715, or its sub-components may be a separate and distinct component in accordance with various aspects of the present disclosure.
  • the UE communications manager 715, or its sub-components may be combined with one or more other hardware components, including but not limited to an input/output (I/O) component, a transceiver, a network server, another computing device, one or more other components described in the present disclosure, or a combination thereof in accordance with various aspects of the present disclosure.
  • I/O input/output
  • the transmitter 720 may transmit signals generated by other components of the device 705.
  • the transmitter 720 may be collocated with a receiver 710 in a transceiver module.
  • the transmitter 720 may be an example of aspects of the transceiver 1020 described with reference to FIG. 10.
  • the transmitter 720 may utilize a single antenna or a set of antennas.
  • FIG. 8 shows a block diagram 800 of a device 805 that supports TA control transmission in DCI for SCG suspension in accordance with aspects of the present disclosure.
  • the device 805 may be an example of aspects of a device 705, or a UE 115 as described herein.
  • the device 805 may include a receiver 810, a UE communications manager 815, and a transmitter 840.
  • the device 805 may also include a processor. Each of these components may be in communication with one another (e.g., via one or more buses) .
  • the receiver 810 may receive information such as packets, user data, or control information associated with various information channels (e.g., control channels, data channels, and information related to TA control transmission in DCI for SCG suspension, etc. ) . Information may be passed on to other components of the device 805.
  • the receiver 810 may be an example of aspects of the transceiver 1020 described with reference to FIG. 10.
  • the receiver 810 may utilize a single antenna or a set of antennas.
  • the UE communications manager 815 may be an example of aspects of the UE communications manager 715 as described herein.
  • the UE communications manager 815 may include a communication configuration component 820, a SCG suspension component 825, an uplink message transmission component 830, and a DCI monitoring component 835.
  • the UE communications manager 815 may be an example of aspects of the UE communications manager 1010 described herein.
  • the communication configuration component 820 may identify a configuration for communicating with a master cell group and a secondary cell group.
  • the I/O controller 1015 may manage input and output signals for the device 1005.
  • the I/O controller 1015 may also manage peripherals not integrated into the device 1005.
  • the I/O controller 1015 may represent a physical connection or port to an external peripheral.
  • the I/O controller 1015 may utilize an operating system such as or another known operating system.
  • the I/O controller 1015 may represent or interact with a modem, a keyboard, a mouse, a touchscreen, or a similar device.
  • the I/O controller 1015 may be implemented as part of a processor.
  • a user may interact with the device 1005 via the I/O controller 1015 or via hardware components controlled by the I/O controller 1015.
  • the transceiver 1020 may communicate bi-directionally, via one or more antennas, wired, or wireless links as described above.
  • the transceiver 1020 may represent a wireless transceiver and may communicate bi-directionally with another wireless transceiver.
  • the transceiver 1020 may also include a modem to modulate the packets and provide the modulated packets to the antennas for transmission, and to demodulate packets received from the antennas.
  • the wireless device may include a single antenna 1025. However, in some cases the device may have more than one antenna 1025, which may be capable of concurrently transmitting or receiving multiple wireless transmissions.
  • the memory 1030 may include random-access memory (RAM) and read-only memory (ROM) .
  • the memory 1030 may store computer-readable, computer-executable code 1035 including instructions that, when executed, cause the processor to perform various functions described herein.
  • the memory 1030 may contain, among other things, a basic I/O system (BIOS) which may control basic hardware or software operation such as the interaction with peripheral components or devices.
  • BIOS basic I/O system
  • the processor 1040 may include an intelligent hardware device, (e.g., a general-purpose processor, a DSP, a central processing unit (CPU) , a microcontroller, an ASIC, an FPGA, a programmable logic device, a discrete gate or transistor logic component, a discrete hardware component, or any combination thereof) .
  • the processor 1040 may be configured to operate a memory array using a memory controller.
  • a memory controller may be integrated into the processor 1040.
  • the processor 1040 may be configured to execute computer-readable instructions stored in a memory (e.g., the memory 1030) to cause the device 1005 to perform various functions (e.g., functions or tasks supporting TA control transmission in DCI for SCG suspension) .
  • the code 1035 may include instructions to implement aspects of the present disclosure, including instructions to support wireless communications.
  • the code 1035 may be stored in a non-transitory computer-readable medium such as system memory or other type of memory. In some cases, the code 1035 may not be directly executable by the processor 1040 but may cause a computer (e.g., when compiled and executed) to perform functions described herein.
  • FIG. 11 shows a block diagram 1100 of a device 1105 that supports TA control transmission in DCI for SCG suspension in accordance with aspects of the present disclosure.
  • the device 1105 may be an example of aspects of a base station 105 as described herein.
  • the device 1105 may include a receiver 1110, a base station communications manager 1115, and a transmitter 1120.
  • the device 1105 may also include a processor. Each of these components may be in communication with one another (e.g., via one or more buses) .
  • FIG. 12 shows a block diagram 1200 of a device 1205 that supports TA control transmission in DCI for SCG suspension in accordance with aspects of the present disclosure.
  • the device 1205 may be an example of aspects of a device 1105, or a base station 105 as described herein.
  • the device 1205 may include a receiver 1210, a base station communications manager 1215, and a transmitter 1240.
  • the device 1205 may also include a processor. Each of these components may be in communication with one another (e.g., via one or more buses) .
  • the base station communications manager 1215 may be an example of aspects of the base station communications manager 1115 as described herein.
  • the base station communications manager 1215 may include a communication configuration identifier 1220, a SCG suspension indication receiver 1225, an uplink message reception component 1230, and a DCI transmission component 1235.
  • the base station communications manager 1215 may be an example of aspects of the base station communications manager 1410 described herein.
  • the communication configuration identifier 1220 may identify that the base station is operating in a communication configuration with a UE, where the base station includes a primary secondary cell of a secondary cell group with respect to the communication configuration with the UE.
  • the SCG suspension indication receiver 1225 may receive, from a master node in the communication configuration, a release message indicating a suspension of secondary node communications with the UE, the secondary node communications including the primary secondary cell.
  • the uplink message reception component 1230 may receive, from the UE, an uplink message after the communications have been suspended with the UE.
  • the transmitter 1240 may transmit signals generated by other components of the device 1205.
  • the transmitter 1240 may be collocated with a receiver 1210 in a transceiver module.
  • the transmitter 1240 may be an example of aspects of the transceiver 1420 described with reference to FIG. 14.
  • the transmitter 1240 may utilize a single antenna or a set of antennas.
  • the SCG suspension indication receiver 1315 may receive, from a master node in the communication configuration, a release message indicating a suspension of secondary node communications with the UE, the secondary node communications including the primary secondary cell.
  • the DCI transmission component 1325 may transmit, to the UE, downlink control information based on receiving the uplink message, the downlink control information including a timing advance parameter for the communications with the secondary cell group.
  • the DCI transmission component 1325 may scramble the downlink control information with a cell radio network temporary identifier for the UE, a dedicated timing advance radio network temporary identifier, a random access radio network temporary identifier, a radio network temporary identifier corresponding to a control resource set for the UE, a radio network temporary identifier corresponding to a search space for the UE, or a combination thereof.
  • the preconfigured uplink message reception component 1335 may receive, from the master node, an uplink channel configuration for receiving a preconfigured uplink message from the UE. In some examples, the preconfigured uplink message reception component 1335 may receive, from the UE, the preconfigured uplink message based on the uplink channel configuration. In some examples, the preconfigured uplink message reception component 1335 may receive, from the master node, a configuration for the preconfigured uplink message.
  • the configuration for the preconfigured uplink message includes a periodicity, a frequency location, a number of repetitions, a control resource set configuration, a search space configuration, a frequency hopping configuration, a modulation and coding scheme, a transmission configuration indicator, or a combination thereof for receiving the preconfigured uplink message.
  • the uplink channel configuration includes a periodic allocation of time resources, frequency resources, beam resource locations, or a combination thereof.
  • FIG. 14 shows a diagram of a system 1400 including a device 1405 that supports TA control transmission in DCI for SCG suspension in accordance with aspects of the present disclosure.
  • the device 1405 may be an example of or include the components of device 1105, device 1205, or a base station 105 as described herein.
  • the device 1405 may include components for bi-directional voice and data communications including components for transmitting and receiving communications, including a base station communications manager 1410, a network communications manager 1415, a transceiver 1420, an antenna 1425, memory 1430, a processor 1440, and an inter-station communications manager 1445. These components may be in electronic communication via one or more buses (e.g., bus 1450) .
  • buses e.g., bus 1450
  • the base station communications manager 1410 may identify that the base station is operating in a communication configuration with a UE, where the base station includes a primary secondary cell of a secondary cell group with respect to the communication configuration with the UE. In some cases, the base station communications manager 1410 may receive, from a master node in the communication configuration, a release message indicating a suspension of secondary node communications with the UE, the secondary node communications including the primary secondary cell. Additionally, the base station communications manager 1410 may receive, from the UE, an uplink message after the communications have been suspended with the UE. Subsequently, the base station communications manager 1410 may transmit, to the UE, downlink control information based on receiving the uplink message, the downlink control information including a timing advance parameter for the communications with the secondary cell group.
  • the transceiver 1420 may communicate bi-directionally, via one or more antennas, wired, or wireless links as described above.
  • the transceiver 1420 may represent a wireless transceiver and may communicate bi-directionally with another wireless transceiver.
  • the transceiver 1420 may also include a modem to modulate the packets and provide the modulated packets to the antennas for transmission, and to demodulate packets received from the antennas.
  • the memory 1430 may include RAM, ROM, or a combination thereof.
  • the memory 1430 may store computer-readable code 1435 including instructions that, when executed by a processor (e.g., the processor 1440) cause the device to perform various functions described herein.
  • a processor e.g., the processor 1440
  • the memory 1430 may contain, among other things, a BIOS which may control basic hardware or software operation such as the interaction with peripheral components or devices.
  • the processor 1440 may include an intelligent hardware device, (e.g., a general-purpose processor, a DSP, a CPU, a microcontroller, an ASIC, an FPGA, a programmable logic device, a discrete gate or transistor logic component, a discrete hardware component, or any combination thereof) .
  • the processor 1440 may be configured to operate a memory array using a memory controller.
  • a memory controller may be integrated into processor 1440.
  • the processor 1440 may be configured to execute computer- readable instructions stored in a memory (e.g., the memory 1430) to cause the device 1405 to perform various functions (e.g., functions or tasks supporting TA control transmission in DCI for SCG suspension) .
  • the code 1435 may include instructions to implement aspects of the present disclosure, including instructions to support wireless communications.
  • the code 1435 may be stored in a non-transitory computer-readable medium such as system memory or other type of memory. In some cases, the code 1435 may not be directly executable by the processor 1440 but may cause a computer (e.g., when compiled and executed) to perform functions described herein.
  • FIG. 15 shows a flowchart illustrating a method 1500 that supports TA control transmission in DCI for SCG suspension in accordance with aspects of the present disclosure.
  • the operations of method 1500 may be implemented by a UE 115 or its components as described herein.
  • the operations of method 1500 may be performed by a UE communications manager as described with reference to FIGs. 7 through 10.
  • a UE may execute a set of instructions to control the functional elements of the UE to perform the functions described below. Additionally or alternatively, a UE may perform aspects of the functions described below using special-purpose hardware.
  • the UE may identify a configuration for communicating with a master cell group and a secondary cell group.
  • the operations of 1505 may be performed according to the methods described herein. In some examples, aspects of the operations of 1505 may be performed by a communication configuration component as described with reference to FIGs. 7 through 10.
  • the UE may receive, from a master node in the master cell group, a release message indicating a suspension of communications with the secondary cell group.
  • the operations of 1510 may be performed according to the methods described herein. In some examples, aspects of the operations of 1510 may be performed by a SCG suspension component as described with reference to FIGs. 7 through 10.
  • the UE may transmit an uplink message to a primary secondary cell of the secondary cell group after the communications have been suspended with the secondary cell group.
  • the operations of 1515 may be performed according to the methods described herein. In some examples, aspects of the operations of 1515 may be performed by an uplink message transmission component as described with reference to FIGs. 7 through 10.
  • the UE may monitor a bandwidth part for downlink control information from the primary secondary cell of the secondary cell group, the downlink control information including a timing advance parameter for the communications with the secondary cell group.
  • the operations of 1520 may be performed according to the methods described herein. In some examples, aspects of the operations of 1520 may be performed by a DCI monitoring component as described with reference to FIGs. 7 through 10.
  • FIG. 16 shows a flowchart illustrating a method 1600 that supports TA control transmission in DCI for SCG suspension in accordance with aspects of the present disclosure.
  • the operations of method 1600 may be implemented by a UE 115 or its components as described herein.
  • the operations of method 1600 may be performed by a UE communications manager as described with reference to FIGs. 7 through 10.
  • a UE may execute a set of instructions to control the functional elements of the UE to perform the functions described below. Additionally or alternatively, a UE may perform aspects of the functions described below using special-purpose hardware.
  • the UE may determine to reestablish the communications with the secondary cell group after the communications have been suspended with the secondary cell group.
  • the operations of 1615 may be performed according to the methods described herein. In some examples, aspects of the operations of 1615 may be performed by a random access message component as described with reference to FIGs. 7 through 10.
  • the UE may transmit an uplink message to a primary secondary cell of the secondary cell group after the communications have been suspended with the secondary cell group.
  • the operations of 1620 may be performed according to the methods described herein. In some examples, aspects of the operations of 1620 may be performed by an uplink message transmission component as described with reference to FIGs. 7 through 10.
  • the UE may transmit, to the primary secondary cell of the secondary cell group, a random access message based on the determination.
  • the operations of 1625 may be performed according to the methods described herein. In some examples, aspects of the operations of 1625 may be performed by a random access message component as described with reference to FIGs. 7 through 10.
  • the UE may monitor a bandwidth part for downlink control information from the primary secondary cell of the secondary cell group, the downlink control information including a timing advance parameter for the communications with the secondary cell group.
  • the operations of 1630 may be performed according to the methods described herein. In some examples, aspects of the operations of 1630 may be performed by a DCI monitoring component as described with reference to FIGs. 7 through 10.
  • the UE may identify a configuration for communicating with a master cell group and a secondary cell group.
  • the operations of 1705 may be performed according to the methods described herein. In some examples, aspects of the operations of 1705 may be performed by a communication configuration component as described with reference to FIGs. 7 through 10.
  • the UE may receive, from a master node in the master cell group, a release message indicating a suspension of communications with the secondary cell group.
  • the operations of 1710 may be performed according to the methods described herein. In some examples, aspects of the operations of 1710 may be performed by a SCG suspension component as described with reference to FIGs. 7 through 10.
  • the UE may transmit an uplink message to a primary secondary cell of the secondary cell group after the communications have been suspended with the secondary cell group.
  • the operations of 1720 may be performed according to the methods described herein. In some examples, aspects of the operations of 1720 may be performed by an uplink message transmission component as described with reference to FIGs. 7 through 10.
  • the UE may transmit, to the primary secondary cell of the secondary cell group, the preconfigured uplink message based on the uplink channel configuration.
  • the operations of 1725 may be performed according to the methods described herein. In some examples, aspects of the operations of 1725 may be performed by a preconfigured uplink message component as described with reference to FIGs. 7 through 10.
  • the UE may monitor a bandwidth part for downlink control information from the primary secondary cell of the secondary cell group, the downlink control information including a timing advance parameter for the communications with the secondary cell group.
  • the operations of 1730 may be performed according to the methods described herein. In some examples, aspects of the operations of 1730 may be performed by a DCI monitoring component as described with reference to FIGs. 7 through 10.
  • the UE may receive, from a master node in the master cell group, a release message indicating a suspension of communications with the secondary cell group.
  • the operations of 1810 may be performed according to the methods described herein. In some examples, aspects of the operations of 1810 may be performed by a SCG suspension component as described with reference to FIGs. 7 through 10.
  • the UE may receive, via radio resource control signaling, a monitoring configuration for the monitoring of the bandwidth part for the downlink control information, where the bandwidth part is monitored for one configured duration based on the monitoring configuration.
  • the operations of 1820 may be performed according to the methods described herein. In some examples, aspects of the operations of 1820 may be performed by a monitoring duration component as described with reference to FIGs. 7 through 10.
  • the UE may monitor a bandwidth part for downlink control information from the primary secondary cell of the secondary cell group, the downlink control information including a timing advance parameter for the communications with the secondary cell group.
  • the operations of 1825 may be performed according to the methods described herein. In some examples, aspects of the operations of 1825 may be performed by a DCI monitoring component as described with reference to FIGs. 7 through 10.
  • the base station may identify that the base station is operating in a communication configuration with a UE, where the base station includes a primary secondary cell of a secondary cell group with respect to the communication configuration with the UE.
  • the operations of 1905 may be performed according to the methods described herein. In some examples, aspects of the operations of 1905 may be performed by a communication configuration identifier as described with reference to FIGs. 11 through 14.
  • the base station may receive, from the UE, an uplink message after the communications have been suspended with the UE.
  • the operations of 1915 may be performed according to the methods described herein. In some examples, aspects of the operations of 1915 may be performed by an uplink message reception component as described with reference to FIGs. 11 through 14.
  • the base station may receive, from a master node in the communication configuration, a release message indicating a suspension of secondary node communications with the UE, the secondary node communications including the primary secondary cell.
  • the operations of 2010 may be performed according to the methods described herein. In some examples, aspects of the operations of 2010 may be performed by a SCG suspension indication receiver as described with reference to FIGs. 11 through 14.
  • the base station may scramble the downlink control information with a cell radio network temporary identifier for the UE, a dedicated timing advance radio network temporary identifier, a random access radio network temporary identifier, a radio network temporary identifier corresponding to a control resource set for the UE, a radio network temporary identifier corresponding to a search space for the UE, or a combination thereof.
  • the operations of 2020 may be performed according to the methods described herein. In some examples, aspects of the operations of 2020 may be performed by a DCI transmission component as described with reference to FIGs. 11 through 14.
  • LTE, LTE-A, LTE-APro, or NR may be described for purposes of example, and LTE, LTE-A, LTE-APro, or NR terminology may be used in much of the description, the techniques described herein are applicable beyond LTE, LTE-A, LTE-APro, or NR networks.
  • the described techniques may be applicable to various other wireless communications systems such as Ultra Mobile Broadband (UMB) , Institute of Electrical and Electronics Engineers (IEEE) 802.11 (Wi-Fi) , IEEE 802.16 (WiMAX) , IEEE 802.20, Flash-OFDM, as well as other systems and radio technologies not explicitly mentioned herein.
  • UMB Ultra Mobile Broadband
  • IEEE Institute of Electrical and Electronics Engineers
  • Wi-Fi Institute of Electrical and Electronics Engineers
  • WiMAX IEEE 802.16
  • IEEE 802.20 Flash-OFDM

Landscapes

  • Engineering & Computer Science (AREA)
  • Computer Networks & Wireless Communication (AREA)
  • Signal Processing (AREA)
  • Mobile Radio Communication Systems (AREA)

Abstract

Des procédés, des systèmes, et des dispositifs destinés aux communications sans fil sont décrits. Un équipement utilisateur (UE) peut communiquer à la fois avec un groupe de cellules maîtresses (MCG) et un groupe de cellules secondaires (SCG) et peut transmettre un message de liaison montante à une cellule secondaire primaire (PSCell) du SCG après que les communications avec le SCG ont été suspendues. Par la suite, la PSCell peut répondre par des informations de commande de liaison descendante (DCI) qui comprennent des informations d'avance temporelle (TA) pour l'UE en vue de leur utilisation pour des communications ultérieures avec le SCG. Dans certains cas, l'UE peut transmettre un message d'accès aléatoire à la PSCell afin de rétablir des communications avec le SCG, et la PSCell peut répondre par des DCI qui comprennent les informations TA. En outre ou en variante, l'UE peut transmettre un message de liaison montante préconfigurée à la PSCell, et la PSCell peut répondre par des DCI en tant que message d'accusé de réception, les DCI comprenant les informations TA.
PCT/CN2020/070591 2020-01-07 2020-01-07 Transmission de commande d'avance temporelle dans des informations de commande de liaison descendante pour une suspension de groupe de cellules secondaires WO2021138791A1 (fr)

Priority Applications (2)

Application Number Priority Date Filing Date Title
PCT/CN2020/070591 WO2021138791A1 (fr) 2020-01-07 2020-01-07 Transmission de commande d'avance temporelle dans des informations de commande de liaison descendante pour une suspension de groupe de cellules secondaires
PCT/CN2020/138254 WO2021139523A1 (fr) 2020-01-07 2020-12-22 Transmission de commande d'avance temporelle dans des informations de commande de liaison descendante pour la suspension d'un groupe de cellules secondaires

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
PCT/CN2020/070591 WO2021138791A1 (fr) 2020-01-07 2020-01-07 Transmission de commande d'avance temporelle dans des informations de commande de liaison descendante pour une suspension de groupe de cellules secondaires

Publications (1)

Publication Number Publication Date
WO2021138791A1 true WO2021138791A1 (fr) 2021-07-15

Family

ID=76787644

Family Applications (2)

Application Number Title Priority Date Filing Date
PCT/CN2020/070591 WO2021138791A1 (fr) 2020-01-07 2020-01-07 Transmission de commande d'avance temporelle dans des informations de commande de liaison descendante pour une suspension de groupe de cellules secondaires
PCT/CN2020/138254 WO2021139523A1 (fr) 2020-01-07 2020-12-22 Transmission de commande d'avance temporelle dans des informations de commande de liaison descendante pour la suspension d'un groupe de cellules secondaires

Family Applications After (1)

Application Number Title Priority Date Filing Date
PCT/CN2020/138254 WO2021139523A1 (fr) 2020-01-07 2020-12-22 Transmission de commande d'avance temporelle dans des informations de commande de liaison descendante pour la suspension d'un groupe de cellules secondaires

Country Status (1)

Country Link
WO (2) WO2021138791A1 (fr)

Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US20170290041A1 (en) * 2016-04-01 2017-10-05 Qualcomm Incorporated Sounding reference signal triggering for enhanced carrier aggregation
WO2017173388A1 (fr) * 2016-04-01 2017-10-05 Huawei Technologies Co., Ltd. Système et procédé destinés aux améliorations, à la transmission et à la commutation srs
US20190215870A1 (en) * 2018-01-09 2019-07-11 Alireza Babaei Random Access And Bandwidth Part Operation
US20190254052A1 (en) * 2016-10-26 2019-08-15 Huawei Technologies Co., Ltd. Grant-free transmission method, terminal device, and network device

Family Cites Families (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US10601535B2 (en) * 2017-03-24 2020-03-24 Lg Electronics Inc. Method for performing SCG re-establishment in dual connectivity in wireless communication system and a device therefor
US11343866B2 (en) * 2017-09-20 2022-05-24 Nokia Technologies Oy Method, apparatus and computer program related to secondary cell group reactivation in multi-radio access technology-dual connectivity
WO2019093940A1 (fr) * 2017-11-10 2019-05-16 Telefonaktiebolaget Lm Ericsson (Publ) Équipement utilisateur, nœuds et procédés mis en oeuvre dans celui-ci

Patent Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US20170290041A1 (en) * 2016-04-01 2017-10-05 Qualcomm Incorporated Sounding reference signal triggering for enhanced carrier aggregation
WO2017173388A1 (fr) * 2016-04-01 2017-10-05 Huawei Technologies Co., Ltd. Système et procédé destinés aux améliorations, à la transmission et à la commutation srs
US20190254052A1 (en) * 2016-10-26 2019-08-15 Huawei Technologies Co., Ltd. Grant-free transmission method, terminal device, and network device
US20190215870A1 (en) * 2018-01-09 2019-07-11 Alireza Babaei Random Access And Bandwidth Part Operation

Non-Patent Citations (3)

* Cited by examiner, † Cited by third party
Title
INTEL CORPORATION: "Practical scoping of SCG suspension operation in NR", 3GPP DRAFT; R2-1914576, 3RD GENERATION PARTNERSHIP PROJECT (3GPP), MOBILE COMPETENCE CENTRE ; 650, ROUTE DES LUCIOLES ; F-06921 SOPHIA-ANTIPOLIS CEDEX ; FRANCE, vol. RAN WG2, no. Reno, USA; 20191118 - 20191122, 8 November 2019 (2019-11-08), Mobile Competence Centre ; 650, route des Lucioles ; F-06921 Sophia-Antipolis Cedex ; France, XP051816640 *
QUALCOMM INCORPORATED: "Further discussion on suspension of SCG", 3GPP DRAFT; R2-1914364, 3RD GENERATION PARTNERSHIP PROJECT (3GPP), MOBILE COMPETENCE CENTRE ; 650, ROUTE DES LUCIOLES ; F-06921 SOPHIA-ANTIPOLIS CEDEX ; FRANCE, vol. RAN WG2, no. Reno, Nevada, US; 20191118 - 20191122, 8 November 2019 (2019-11-08), Mobile Competence Centre ; 650, route des Lucioles ; F-06921 Sophia-Antipolis Cedex ; France, XP051816448 *
SAMSUNG: "CR to 38.213 capturing the RAN1#94bis and RAN1#95 meeting agreements", 3GPP DRAFT; R1-1814394 DRAFT CR 38.213 AFTER RAN1#95, 3RD GENERATION PARTNERSHIP PROJECT (3GPP), MOBILE COMPETENCE CENTRE ; 650, ROUTE DES LUCIOLES ; F-06921 SOPHIA-ANTIPOLIS CEDEX ; FRANCE, vol. RAN WG1, no. Spokane, USA; 20181112 - 20181116, 30 November 2018 (2018-11-30), Mobile Competence Centre ; 650, route des Lucioles ; F-06921 Sophia-Antipolis Cedex ; France, XP051494851 *

Also Published As

Publication number Publication date
WO2021139523A1 (fr) 2021-07-15

Similar Documents

Publication Publication Date Title
EP3669577B1 (fr) Configurations pour transmettre des messages de préambule d'accès aléatoire
EP3977805B1 (fr) Association de faisceau pendant des procédures d'accès aléatoire
US20220295410A1 (en) Enhanced power savings through mobile initiated dormancy
EP3776954B1 (fr) Gestion de répétition de blocs de transport pour transmissions de liaison descendante et de liaison montante
EP4055979B1 (fr) Extensions de préfixe cyclique pour spectre sans licence
EP4173427A1 (fr) Accès à un canal avec réservation pour communication de liaison latérale dans un spectre sans licence
EP4115557A1 (fr) Adaptation de débit entre liaison montante et liaison descendante
EP4091259A1 (fr) Signalisation pour configurer des transmissions de liaison descendante
WO2021207503A1 (fr) Techniques de priorisation de communication pour des communications de liaison latérale
WO2020227154A1 (fr) Commande de canal de commande multi-panneau, accès initial et transfert intercellulaire
KR20210112314A (ko) 자율 송신 구성 업데이트
WO2020198941A1 (fr) Reprise aveugle nr
WO2020154841A1 (fr) Double connectivité basée sur un mesurage, et activation d'agrégation de porteuses
WO2021096960A1 (fr) Détermination de priorités pour des canaux se chevauchant
US11985600B2 (en) Multimode secondary cell group dormancy
WO2020150991A1 (fr) Configuration de groupe de cellules secondaires aveugles dans une technologie de connectivité double d'accès multi-radio
US11825516B2 (en) Message configuration for two-step random access procedure
EP4316132A1 (fr) Répétition de canal de commande de liaison descendante pour un ordre de canal de commande de liaison descendante
EP4316142A1 (fr) Activation et désactivation d'occasions de canal d'accès aléatoire
EP4214989A1 (fr) Préemption pour des communications en liaison latérale
WO2021109115A1 (fr) Configuration de période de trame fixe pour bande passante d'écoute avant transmission
WO2021139523A1 (fr) Transmission de commande d'avance temporelle dans des informations de commande de liaison descendante pour la suspension d'un groupe de cellules secondaires
WO2023050025A1 (fr) Sélection de porteuse pour des messages d'accès aléatoire de liaison descendante
WO2022251067A1 (fr) Techniques de planification pour une transmission de rétroaction de liaison montante
KR20230155439A (ko) 세컨더리 셀들에 대한 레퍼런스 신호 시그널링

Legal Events

Date Code Title Description
121 Ep: the epo has been informed by wipo that ep was designated in this application

Ref document number: 20912529

Country of ref document: EP

Kind code of ref document: A1

NENP Non-entry into the national phase

Ref country code: DE

122 Ep: pct application non-entry in european phase

Ref document number: 20912529

Country of ref document: EP

Kind code of ref document: A1