WO2021237581A1 - Déclenchement d'un retour en arrière pour un service sensible à la latence - Google Patents

Déclenchement d'un retour en arrière pour un service sensible à la latence Download PDF

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Publication number
WO2021237581A1
WO2021237581A1 PCT/CN2020/092968 CN2020092968W WO2021237581A1 WO 2021237581 A1 WO2021237581 A1 WO 2021237581A1 CN 2020092968 W CN2020092968 W CN 2020092968W WO 2021237581 A1 WO2021237581 A1 WO 2021237581A1
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Prior art keywords
connection
cell group
signal quality
establishing
timer
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PCT/CN2020/092968
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English (en)
Inventor
Jingming CHANG
Haojun WANG
Yi Liu
Jinglin Zhang
Zhenqing CUI
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Qualcomm Inc
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Qualcomm Inc
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Priority to PCT/CN2020/092968 priority Critical patent/WO2021237581A1/fr
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    • 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
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04W—WIRELESS COMMUNICATION NETWORKS
    • H04W76/00—Connection management
    • H04W76/30—Connection release
    • H04W76/34—Selective release of ongoing connections
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04W—WIRELESS COMMUNICATION NETWORKS
    • H04W88/00—Devices specially adapted for wireless communication networks, e.g. terminals, base stations or access point devices
    • H04W88/02—Terminal devices
    • H04W88/06—Terminal devices adapted for operation in multiple networks or having at least two operational modes, e.g. multi-mode terminals

Definitions

  • Some examples of the method, apparatuses, and non-transitory computer-readable medium described herein may further include operations, features, means, or instructions for determining that a first signal quality for the second cell group may be greater than a second signal quality for the first cell group, where the timer may be deactivated based on the first signal quality being greater than the second signal quality.
  • Some examples of the method, apparatuses, and non-transitory computer-readable medium described herein may further include operations, features, means, or instructions for determining an expiry of the timer, where the timer may be deactivated based on the expiry of the timer.
  • Some examples of the method, apparatuses, and non-transitory computer-readable medium described herein may further include operations, features, means, or instructions for communicating data via the first connection with the first cell group associated with the first RAT based on releasing the second connection.
  • the measurement report associated with re-establishing the second connection indicates a B1 event for inter-RAT data handover.
  • the first cell group includes a master cell group (MCG) and the second cell group includes a secondary cell group (SCG) .
  • MCG master cell group
  • SCG secondary cell group
  • FIGs. 5 and 6 show block diagrams of devices that support triggering dropback for latency sensitive service in accordance with aspects of the present disclosure.
  • FIG. 7 shows a block diagram of a communications manager that supports triggering dropback for latency sensitive service in accordance with aspects of the present disclosure.
  • the network may trigger the UE to re-establish the NR connection, causing the UE to enter a looped procedure.
  • a looped procedure may adversely impact the UE’s data service, cause significant processing overhead at the UE, and cause significant messaging overhead on a channel due to the repeated NR connection setup and release procedures.
  • a UE may trigger dropback to LTE to run the latency sensitive service. For example, a UE may run an application associated with latency sensitive service, such as an application associated with a minimum data rate threshold, a minimum latency threshold, or both. If the UE is operating according to an EN-DC mode, the UE may use an NR connection to communicate data with the network for the application. However, in some cases, based on an NR signal quality, the UE’s NR connection may fail to support the data rate, latency threshold, or both for the latency sensitive service.
  • an application associated with latency sensitive service such as an application associated with a minimum data rate threshold, a minimum latency threshold, or both.
  • Modifying the criteria for triggering the measurement report may involve the UE operating according to a different mode for identifying a B1 entering condition.
  • a B1 entering condition may involve the UE identifying a signal quality for an inter-RAT neighboring cell exceeding a threshold.
  • the UE may operate according to a baseline mode or according to a “Mode 1” (e.g., corresponding to one or more additional thresholds or one or more additional offsets as compared to the baseline mode) .
  • Mode 1 may correspond to a heightened threshold for establishing an NR connection with a neighboring cell as compared to the baseline mode.
  • the UE may activate a timer based on receiving a data stall indicator, based on detecting data stall at the UE, based on detecting a looped procedure of establishing and releasing an NR connection, or based on any combination thereof.
  • the base stations 105 may be dispersed throughout a geographic area to form the wireless communications system 100 and may be devices in different forms or having different capabilities.
  • the base stations 105 and the UEs 115 may wirelessly communicate via one or more communication links 125.
  • Each base station 105 may provide a coverage area 110 over which the UEs 115 and the base station 105 may establish one or more communication links 125.
  • the coverage area 110 may be an example of a geographic area over which a base station 105 and a UE 115 may support the communication of signals according to one or more radio access technologies.
  • the UEs 115 and the base stations 105 may wirelessly communicate with one another via one or more communication links 125 over one or more carriers.
  • the term “carrier” may refer to a set of radio frequency spectrum resources having a defined physical layer structure for supporting the communication links 125.
  • a carrier used for a communication link 125 may include a portion of a radio frequency spectrum band (e.g., a bandwidth part (BWP) ) that is operated according to one or more physical layer channels for a given radio access technology (e.g., LTE, LTE-A, LTE-A Pro, NR) .
  • BWP bandwidth part
  • a carrier may also have acquisition signaling or control signaling that coordinates operations for other carriers.
  • a carrier may be associated with a frequency channel (e.g., an E-UTRA absolute radio frequency channel number (EARFCN) ) and may be positioned according to a channel raster for discovery by the UEs 115.
  • a carrier may be operated in a standalone mode where initial acquisition and connection may be conducted by the UEs 115 via the carrier, or the carrier may be operated in a non-standalone mode where a connection is anchored using a different carrier (e.g., of the same or a different radio access technology) .
  • the communication links 125 shown in the wireless communications system 100 may include uplink transmissions from a UE 115 to a base station 105, or downlink transmissions from a base station 105 to a UE 115.
  • Carriers may carry downlink or uplink communications (e.g., in an FDD mode) or may be configured to carry downlink and uplink communications (e.g., in a TDD mode) .
  • 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
  • a subframe, a slot, a mini-slot, or a symbol may be the smallest scheduling unit (e.g., in the time domain) of the wireless communications system 100 and may be referred to as a transmission time interval (TTI) .
  • TTI duration e.g., the number of symbol periods in a TTI
  • the smallest scheduling unit of the wireless communications system 100 may be dynamically selected (e.g., in bursts of shortened TTIs (sTTIs) ) .
  • 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.
  • the control plane entity may manage non-access stratum (NAS) functions such as mobility, authentication, and bearer management for the UEs 115 served by the base stations 105 associated with the core network 130.
  • NAS non-access stratum
  • User IP packets may be transferred through the user plane entity, which may provide IP address allocation as well as other functions.
  • the user plane entity may be connected to the network operators IP services 150.
  • the operators IP services 150 may include access to the Internet, Intranet (s) , an IP Multimedia Subsystem (IMS) , or a Packet-Switched Streaming Service.
  • 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 operate using one or more frequency bands, typically in the range of 300 megahertz (MHz) to 300 gigahertz (GHz) .
  • the region from 300 MHz to 3 GHz is known as the ultra-high frequency (UHF) region or decimeter band because the wavelengths range from approximately one decimeter to one meter in length.
  • UHF waves may be blocked or redirected by buildings and environmental features, but the waves may penetrate structures sufficiently for a macro cell to provide service to the UEs 115 located indoors.
  • the transmission of UHF waves may be associated with smaller antennas and shorter ranges (e.g., less than 100 kilometers) compared to transmission using the smaller frequencies and longer waves of the high frequency (HF) or very high frequency (VHF) portion of the spectrum below 300 MHz.
  • HF high frequency
  • VHF very high frequency
  • 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.
  • 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.
  • 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 Radio Resource Control (RRC) protocol layer may provide establishment, configuration, and maintenance of an RRC connection between a UE 115 and a base station 105 or a core network 130 supporting radio bearers for user plane data.
  • RRC Radio Resource Control
  • transport channels may be mapped to physical channels.
  • a UE 115 may be capable of DC operations. That is, the UE 115 may be capable of communicating with a wireless network using different RATs concurrently.
  • the wireless communications system 100 may support DC via a master cell (e.g., an LTE cell) and a secondary cell (e.g., an NR cell) .
  • a master cell e.g., an LTE cell
  • a secondary cell e.g., an NR cell
  • three bearer types may exist for a UE 115: a master cell group (MCG) bearer, a secondary cell group (SCG) bearer, and a split bearer.
  • MCG master cell group
  • SCG secondary cell group
  • An MCG may correspond to a first cell group with which the UE 115 initially connects with the network, with which the UE 115 communicates control information, or both.
  • An SCG may correspond to a second cell group added in addition to a first cell group with which the UE 115 may communicate data.
  • a UE 115 may communicate with a first base station 105 (e.g., an eNB) supporting an LTE connection for an MCG and with a second base station 105 (e.g., a gNB) supporting an NR connection for an SCG.
  • a first base station 105 e.g., an eNB
  • a second base station 105 e.g., a gNB
  • the network may configure the UE 115 with parameters associated with the MCG bearer, the SCG bearer, the split bearer, or a combination thereof.
  • the network may configure the UE 115 with a “keyToUse” parameter and an “UL-datasplitthreshold” parameter.
  • the keyToUse and UL-datasplitthreshold parameters may indicate whether the UE 115 is to transmit uplink data via a secondary cell path (e.g., to an SCG) and whether the UE 115 supports an uplink split bearer.
  • the NR connection may not support latency sensitive service (e.g., services which involve a relatively quick response time, a relatively high data rate, etc. ) .
  • the NR signal may be weak compared to the LTE signal.
  • the UE 115 may be located at the edge of the geographic coverage area 110 for the NR cell while utilizing latency sensitive services. However, the UE 115 may have a relatively strong connection with an LTE cell (e.g., supporting a data rate sufficient for the latency sensitive service) . In some such cases, the UE 115 may improve performance of the latency sensitive service by falling back to the LTE connection and using the MCG as the DRB.
  • FIG. 2 illustrates an example of a wireless communications system 200 that supports triggering dropback for latency sensitive service in accordance with aspects of the present disclosure.
  • a UE 115 may fallback to an MCG in latency sensitive situations when the signal strength and/or quality associated with a connection to an SCG is weak (e.g., below a specific threshold) .
  • the wireless communications system 200 may implement aspects of a wireless communications system 100.
  • the wireless communications system 200 may include base station 105-a, base station 105-b, and UE 115-a, which may be examples of base stations 105 and a UE 115 as described with reference to FIG. 1.
  • Base station 105-a may serve coverage area 110-a and base station 105-b may serve coverage area 110-b.
  • UE 115-a may establish a connection 205-b to the network via an NR cell.
  • UE 115-a may experience significant latency while communicating with the network via the NR cell during latency sensitive operations, for example, if signaling quality for the NR cell is weak (e.g., below a specific quality or strength threshold) .
  • the network may configure UE 115-a (e.g., operating in NSA mode) with an SCG connection, such as connection 205-b.
  • UE 115-a may initially establish connection 205-a with an MCG and may add connection 205-b with an SCG (e.g., based on an RRC reconfiguration message indicating SCG addition) .
  • UE 115-a may communicate data with the network via connection 205-b to the NR cell.
  • UE 115-a may receive reference signals and assess the power and/or quality characteristics of the received reference signals.
  • UE 115-a may communicate via the secondary cell (e.g., the NR cell) even when the signal associated with the secondary cell is relatively weak (e.g., a signal measurement for connection 205-b fails to meet a threshold) .
  • the signal associated with the secondary cell is relatively weak (e.g., a signal measurement for connection 205-b fails to meet a threshold) .
  • UE 115-a may be located or moving toward the edge of coverage area 110-b.
  • UE 115-a may run one or more latency sensitive services, such as playing a game, utilizing ping services, running speed tests, or performing any other latency sensitive operations. Because UE 115-a may continue communication via the NR cell while the signal associated with the NR cell is relatively weak, the uplink data rate, downlink data rate, or both may be unstable.
  • Latency sensitive services may transmit and/or receive data at a high rate compared to other services with more elongated response times and, thus, an unstable uplink data rate, downlink data rate, or both may increase latency and decrease overall user experience for a latency sensitive service.
  • connection 205-b does not support a data rate used by a latency sensitive service
  • base station 105-b, UE 115-a, or both may experience data stall, where data builds up in a messaging buffer due to the insufficient data rate.
  • the block error rate (BLER) for uplink data, downlink data, or both may increase based on the relatively weak NR connection.
  • UE 115-a may experience significant uplink power limitation due to a high pathloss for the NR connection, resulting in unsuccessful uplink transmissions.
  • UE 115-a may release the SCG connection when the signal associated with the secondary cell is weak (e.g., below a threshold) in latency sensitive situations. For example, UE 115-a may trigger a radio link failure (RLF) due to the poor signal and may transmit a release request message to the network. In response, the network may release UE 115-a from the SCG connection (e.g., connection 205-b) and UE 115-a may fall back to the MCG connection (e.g., connection 205-a) . UE 115-a may communicate with the network (e.g., for both data and control signaling) via the LTE cell.
  • RLF radio link failure
  • the network may successfully re-establish the SCG connection.
  • the network may fail to re-establish the SCG connection (e.g., based on a random access channel (RACH) failure) .
  • RACH random access channel
  • a cycle of establishing and releasing the NR connection may occur and system latency may increase to the point of data stall (e.g., indicated by a 460 error code) .
  • the cycle of establishing and releasing the NR connection may involve significant signaling overhead on a channel and significant processing overhead at UE 115-a.
  • UE 115-a may fallback to an MCG connection (e.g., connection 205-a) from an SCG connection (e.g., connection 205-b) for data communications during latency sensitive situations when the signal associated with the secondary cell is weak.
  • UE 115-a may determine if latency sensitive services are currently in use at UE 115-a.
  • UE 115-a may utilize information within the application layer to determine if an application running at the UE 115-a corresponds to a latency sensitive service.
  • a latency sensitive service may be any service that reacts quickly (e.g., on the scale of one or more subframes, frames, or milliseconds) to specific events in order for the service to operate properly.
  • a latency sensitive service may be associated with a specific latency threshold (e.g., for communicating or responding to data packets) , a specific data rate threshold (e.g., for downlink data, uplink data, or both) , or some combination thereof.
  • UE 115-a may receive a data stall indicator from the network (e.g., from base station 105-a or base station 105-b) which may indicate that data stall is occurring and that latency sensitive service may not be supported.
  • UE 115-a may change a threshold associated with the standard entering condition (e.g., increase the threshold) , add one or more parameters to the standard entering condition (e.g., an NR B1 Offset) , add one or more thresholds to the standard entering condition (e.g., an NR SNR Threshold) , or some combination thereof when operating according to Mode 1.
  • a threshold associated with the standard entering condition e.g., increase the threshold
  • add one or more parameters to the standard entering condition e.g., an NR B1 Offset
  • add one or more thresholds to the standard entering condition e.g., an NR SNR Threshold
  • the modified trigger condition for a B1 event according to Mode 1 may be defined by Equation 2:
  • an SNR threshold associated with the neighboring cell may be defined for Mode 1 but not the baseline mode (e.g., Addition_NR_SNR_Threshold) and an additional offset value may be defined for Mode 1 as compared to the baseline mode (e.g., Addition_NR_B1_Offset) .
  • an NR signal that satisfies the entering condition (s) according to Mode 1 may be stronger than an NR signal that satisfies the standard entering condition (s) (e.g., for the baseline mode) .
  • UE 115-a may stop running latency sensitive services. For example, a user may stop playing a game on UE 115-a. In some such examples, when latency sensitive services cease, UE 115-a may transmit the measurement report 220 to the network according to the baseline mode (e.g., a “Mode 0” ) . Mode 0 may indicate a removal of the modified parameters and thresholds for Mode 1, reverting the entering condition (s) back to the standard entering condition (s) . As such, UE 115-a may recover to operate in ENDC mode (e.g., using an NR connection for data communication) based on reverting to the baseline criteria for establishing the connection 205-b.
  • the baseline mode e.g., a “Mode 0”
  • Mode 0 may indicate a removal of the modified parameters and thresholds for Mode 1, reverting the entering condition (s) back to the standard entering condition (s) .
  • UE 115-a may recover to operate in ENDC
  • FIG. 3 illustrates an example of a process flow 300 that supports triggering dropback for latency sensitive service in accordance with aspects of the present disclosure.
  • the process flow 300 may implement aspects of a wireless communications system 100 or 200.
  • the process flow 300 may include UE 115-b, which may be an example of a UE 115 as described with reference to FIGs. 1 and 2.
  • UE 115-b may operate in an NSA mode. That is, UE 115-b may be capable of communicating with a wireless network via an MCG associated with a first RAT (e.g., LTE) and an SCG associated with a second RAT (e.g., NR) .
  • a first RAT e.g., LTE
  • a second RAT e.g., NR
  • the timer may run for the active duration before expiring (or until a condition for stopping the timer occurs) .
  • UE 115-b may reassess the updated procedure. That is, UE 115-b may revert back to an initial SCG procedure if the timer is deactivated. For example, at 330, UE 115-b may determine whether the timer has expired. If the timer has not expired, UE 115-b may determine whether to transmit the measurement report according to either the baseline mode or Mode 1 (e.g., at 335) . If the timer has expired, UE 115-b may determine whether to transmit the measurement report according to the baseline mode at 350.
  • UE 115-b may determine if the master cell has changed (e.g., if the LTE cell has changed) . For example, UE 115-b may move into another coverage area and the network may perform handover for UE 115-b to another base station 115 supporting an LTE cell. If the master cell has changed, UE 115-b may stop the timer and reset the timer to a timer start value at 345 (e.g., based on the timer being cell-specific) . In this way, UE 115-b may revert back to a baseline mode for determining whether to trigger a measurement report transmission at 350.
  • FIG. 4 illustrates an example of a process flow 400 that supports triggering dropback for latency sensitive service in accordance with aspects of the present disclosure.
  • the process flow 400 may implement aspects of a wireless communications system 100 or 200 as described with reference to FIGs. 1 and 2.
  • the process flow 400 may involve UE 115-c operating in a DC mode with base station 105-c (e.g., an eNB supporting an LTE cell) and base station 105-d (e.g., a gNB supporting an NR cell) .
  • base station 105-c e.g., an eNB supporting an LTE cell
  • base station 105-d e.g., a gNB supporting an NR cell
  • UE 115-c may operate in an NSA mode.
  • UE 115-c may run a latency sensitive service. For example, UE 115-c may run an application associated with a specific latency threshold, a specific data rate threshold, or both, such as playing a mobile game. While operating in the DC mode, UE 115-c may use the NR connection to communicate data with the network to support running the latency sensitive service (e.g., according to the specific latency threshold, the specific data rate threshold, or both) .
  • UE 115-c may determine that a signal quality of the second connection is less than a threshold quality. For example, an RSRP measurement, an RSRQ measurement, an RSSI measurement, an SNR measurement, an SINR measurement, or some combination thereof for the NR connection may fail to meet a threshold quality level. In some cases, this signal quality measurement for the second connection may trigger RLF at 425 for the second connection. In other cases, the signal quality measurement may indicate that the second connection may not support the latency threshold, the data rate threshold, or both for the latency sensitive service.
  • a threshold quality For example, an RSRP measurement, an RSRQ measurement, an RSSI measurement, an SNR measurement, an SINR measurement, or some combination thereof for the NR connection may fail to meet a threshold quality level. In some cases, this signal quality measurement for the second connection may trigger RLF at 425 for the second connection. In other cases, the signal quality measurement may indicate that the second connection may not support the latency threshold, the data rate threshold, or both for the latency sensitive service.
  • UE 115-c may receive a data stall indicator.
  • base station 105-d may transmit the data stall indicator based on determining that the signal quality of the second connection is less than the threshold quality.
  • base station 105-d may transmit the data stall indicator based on determining that the data rate for UE 115-c fails to support a latency sensitive service at UE 115-c.
  • base station 105-d may detect data buildup in a messaging queue at base station 105-d based on the data rate supported by the second connection falling below a data rate threshold for the latency sensitive service.
  • base station 105-c may transmit the data stall indicator.
  • UE 115-c may trigger RLF at 425 for the second connection based on the data stall indicator.
  • UE 115-c may further determine that a previous data connection was via the SCG (e.g., an NR connection) and may trigger the RLF further based on the previous data connection.
  • SCG e.g., an NR connection
  • the first trigger condition may correspond to a baseline mode for sending a measurement report to re-establish an inter-RAT connection (e.g., an NR connection with an SCG in ENDC)
  • the second trigger condition may correspond to a second mode (e.g., Mode 1) for sending the measurement report.
  • the first trigger condition may include a first signal quality measurement for the second cell group exceeding a first threshold
  • the second trigger condition may include the first signal quality measurement (e.g., in some cases, with an additional offset value) for the second cell group exceeding the first threshold and a second signal quality measurement for the second cell group exceeding a second threshold.
  • UE 115-c may transmit a measurement report at 455 to trigger re-establishment of the second connection.
  • UE 115-c may re-establish the second connection with the second cell group (or a different second cell group supporting NR) based on transmitting the measurement report.
  • UE 115-c may communicate data via the second connection with the second cell group based on re-establishing the second connection. Because the NR cell meets the modified criterion, the NR cell may support a data rate sufficient to support the latency sensitive service at UE 115-c. As such, UE 115-c may avoid entering a looped procedure of NR release and re-establishment (e.g., based on using the modified criterion for triggering the measurement report) .
  • FIG. 5 shows a block diagram 500 of a device 505 that supports triggering dropback for latency sensitive service in accordance with aspects of the present disclosure.
  • the device 505 may be an example of aspects of a UE 115 as described herein.
  • the device 505 may include a receiver 510, a communications manager 515, and a transmitter 520.
  • the device 505 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 510 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 triggering dropback for latency sensitive service, etc. ) . Information may be passed on to other components of the device 505.
  • the receiver 510 may be an example of aspects of the transceiver 820 described with reference to FIG. 8.
  • the receiver 510 may utilize a single antenna or a set of antennas.
  • the actions performed by the communications manager 515 as described herein may be implemented to realize one or more potential advantages. For example, modifying the criterion for triggering a measurement report to re-establish a second connection (e.g., an NR connection for DC operation) may allow the device 505 (e.g., a UE 115) to break out of a looped procedure involving repeatedly setting up and releasing an NR connection with an SCG. Breaking out of this procedure may reduce processing and channel overhead, as the UE 115 may reduce the number of times that SCG setup and release is performed. Additionally or alternatively, breaking out of this procedure may allow the UE 115 to fall back to LTE operations, supporting data communications over an LTE connection.
  • a second connection e.g., an NR connection for DC operation
  • a processor of the device 505 may reduce processing resources used for network connection procedures. For example, by reducing a number of times the device 505 (e.g., a UE 115) sets up and releases an SCG connection in a looped procedure, the device 505 may reduce the processing overhead associated with establishing these connections.
  • Reducing the number of SCG connection procedures may reduce a number of times the processor ramps up processing power and turns on processing units to handle network connection (e.g., 5G network connection) procedures in an NSA mode. Additionally or alternatively, by triggering SCG release when data stall occurs, the device 505 may improve performance of a latency sensitive service and improve user experience.
  • network connection e.g., 5G network connection
  • the communications manager 515 may be implemented in hardware, code (e.g., software or firmware) executed by a processor, or any combination thereof. If implemented in code executed by a processor, the functions of the communications manager 515, or its sub-components may be executed by a general-purpose processor, a digital signal processor (DSP) , an application-specific integrated circuit (ASIC) , a field programmable gate array (FPGA) or other programmable logic device, discrete gate or transistor logic, discrete hardware components, or any combination thereof designed to perform the functions described in the present disclosure.
  • DSP digital signal processor
  • ASIC application-specific integrated circuit
  • FPGA field programmable gate array
  • FIG. 6 shows a block diagram 600 of a device 605 that supports triggering dropback for latency sensitive service in accordance with aspects of the present disclosure.
  • the device 605 may be an example of aspects of a device 505 or a UE 115 as described herein.
  • the device 605 may include a receiver 610, a communications manager 615, and a transmitter 640.
  • the device 605 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 610 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 triggering dropback for latency sensitive service, etc. ) . Information may be passed on to other components of the device 605.
  • the receiver 610 may be an example of aspects of the transceiver 820 described with reference to FIG. 8.
  • the receiver 610 may utilize a single antenna or a set of antennas.
  • the connection establishment component 620 may establish a first connection with a first cell group associated with a first RAT and a second connection with a second cell group associated with a second RAT.
  • the signal quality evaluation component 625 may determine that a signal quality of the second connection is less than a threshold quality.
  • the connection release component 630 may release the second connection with the second cell group based on the signal quality of the second connection.
  • the measurement report trigger component 635 may modify a criterion for triggering a measurement report associated with re-establishing the second connection based on the signal quality of the second connection.
  • the connection establishment component 710 may establish a first connection with a first cell group associated with a first RAT and a second connection with a second cell group associated with a second RAT.
  • the first RAT may be an LTE technology, a 4G technology, or a combination thereof
  • the second RAT may be an NR technology, a 5G technology, or a combination thereof.
  • the first cell group may be an MCG and the second cell group may be an SCG.
  • the signal quality evaluation component 715 may determine that a signal quality of the second connection is less than a threshold quality.
  • the connection release component 720 may release the second connection with the second cell group based on the signal quality of the second connection.
  • the measurement report trigger component 725 may modify a criterion for triggering a measurement report associated with re-establishing the second connection based on the signal quality of the second connection. In some cases, the measurement report associated with re-establishing the second connection indicates a B1 event for inter-RAT data handover.
  • modifying the criterion for triggering the measurement report associated with re-establishing the second connection may involve the measurement report trigger component 725 updating a trigger condition for transmitting the measurement report associated with re-establishing the second connection from a first trigger condition to a second trigger condition.
  • the first trigger condition may include a first signal quality measurement for the second cell group exceeding a first threshold
  • the second trigger condition may include the first signal quality measurement for the second cell group exceeding the first threshold and a second signal quality measurement for the second cell group exceeding a second threshold.
  • the timer component 730 may switch the first connection from a first cell to a second cell, where the timer is deactivated based on switching the first connection to the second cell. Additionally or alternatively, the timer component 730 may determine that a first signal quality for the second cell group is greater than a second signal quality for the first cell group, where the timer is deactivated based on the first signal quality being greater than the second signal quality. In some cases, the timer component 730 may determine an expiry of the timer, where the timer is deactivated based on the expiry of the timer.
  • the data stall indicator component 735 may receive, from a base station corresponding to the first cell group, the second cell group, or both, a data stall indicator based on the signal quality of the second connection. In some examples, the data stall indicator component 735 may determine that a previous data connection is via the second cell group. In some such examples, the RLF component 740 may trigger an RLF for the second connection based on the data stall indicator and the previous data connection being via the second cell group, where the second connection with the second cell group is released based on the triggered RLF. In some other examples, the RLF component 740 may trigger an RLF for the second connection based on the quality of the second connection, where the second connection is released based on the triggered RLF.
  • the application identifier 745 may identify an application running at the UE, where modifying the criterion for triggering the measurement report associated with re-establishing the second connection is further based on the application running at the UE.
  • the application may be associated with a latency threshold, a data rate threshold, or a combination thereof (e.g., the application may correspond to a latency sensitive service) .
  • the application identifier 745 may identify the application ends at the UE and may determine whether to trigger transmission of the measurement report associated with re-establishing the second connection using a baseline criterion based on the application ending at the UE, where the modified criterion is modified from the baseline criterion.
  • the signal quality evaluation component 715 may measure an additional signal quality for the second cell group, and the measurement report trigger component 725 may trigger transmission of the measurement report associated with re-establishing the second connection based on comparing the additional signal quality to at least the modified criterion.
  • the communication component 750 may operate in a DC mode, where the first connection and the second connection are established based on operating in the DC mode.
  • the communications manager 810 may establish a first connection with a first cell group associated with a first RAT and a second connection with a second cell group associated with a second RAT, determine that a signal quality of the second connection is less than a threshold quality, release the second connection with the second cell group based on the signal quality of the second connection, and modify a criterion for triggering a measurement report associated with re-establishing the second connection based on the signal quality of the second connection.
  • the wireless device may include a single antenna 825. However, in some cases the device may have more than one antenna 825, which may be capable of concurrently transmitting or receiving multiple wireless transmissions.
  • the memory 830 may include random-access memory (RAM) and read-only memory (ROM) .
  • the memory 830 may store computer-readable, computer-executable code 835 including instructions that, when executed, cause the processor to perform various functions described herein.
  • the memory 830 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 840 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 840 may be configured to operate a memory array using a memory controller.
  • a memory controller may be integrated into the processor 840.
  • the processor 840 may be configured to execute computer-readable instructions stored in a memory (e.g., the memory 830) to cause the device 805 to perform various functions (e.g., functions or tasks supporting triggering dropback for latency sensitive service) .
  • the code 835 may include instructions to implement aspects of the present disclosure, including instructions to support wireless communications.
  • the code 835 may be stored in a non-transitory computer-readable medium such as system memory or other type of memory.
  • the code 835 may not be directly executable by the processor 840 but may cause a computer (e.g., when compiled and executed) to perform functions described herein.
  • FIG. 9 shows a flowchart illustrating a method 900 that supports triggering dropback for latency sensitive service in accordance with aspects of the present disclosure.
  • the operations of method 900 may be implemented by a UE 115 or its components as described herein.
  • the operations of method 900 may be performed by a communications manager as described with reference to FIGs. 5 through 8.
  • 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 establish a first connection with a first cell group associated with a first RAT and a second connection with a second cell group associated with a second RAT.
  • the operations of 905 may be performed according to the methods described herein. In some examples, aspects of the operations of 905 may be performed by a connection establishment component as described with reference to FIGs. 5 through 8.
  • the UE may determine that a signal quality of the second connection is less than a threshold quality.
  • the operations of 910 may be performed according to the methods described herein. In some examples, aspects of the operations of 910 may be performed by a signal quality evaluation component as described with reference to FIGs. 5 through 8.
  • the UE may release the second connection with the second cell group based on the signal quality of the second connection.
  • the operations of 915 may be performed according to the methods described herein. In some examples, aspects of the operations of 915 may be performed by a connection release component as described with reference to FIGs. 5 through 8.
  • the UE may modify a criterion for triggering a measurement report associated with re-establishing the second connection based on the signal quality of the second connection.
  • the operations of 920 may be performed according to the methods described herein. In some examples, aspects of the operations of 920 may be performed by a measurement report trigger component as described with reference to FIGs. 5 through 8.
  • FIG. 10 shows a flowchart illustrating a method 1000 that supports triggering dropback for latency sensitive service in accordance with aspects of the present disclosure.
  • the operations of method 1000 may be implemented by a UE 115 or its components as described herein.
  • the operations of method 1000 may be performed by a communications manager as described with reference to FIGs. 5 through 8.
  • 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 that a signal quality of the second connection is less than a threshold quality.
  • the operations of 1010 may be performed according to the methods described herein. In some examples, aspects of the operations of 1010 may be performed by a signal quality evaluation component as described with reference to FIGs. 5 through 8.
  • the UE may release the second connection with the second cell group based on the signal quality of the second connection.
  • the operations of 1015 may be performed according to the methods described herein. In some examples, aspects of the operations of 1015 may be performed by a connection release component as described with reference to FIGs. 5 through 8.
  • the UE may activate a timer based on the signal quality of the second connection.
  • the operations of 1020 may be performed according to the methods described herein. In some examples, aspects of the operations of 1020 may be performed by a timer component as described with reference to FIGs. 5 through 8.
  • the UE may modify a criterion for triggering a measurement report associated with re-establishing the second connection based on the timer being activated.
  • the operations of 1025 may be performed according to the methods described herein. In some examples, aspects of the operations of 1025 may be performed by a measurement report trigger component as described with reference to FIGs. 5 through 8.
  • the UE may determine whether to trigger transmission of the measurement report associated with re-establishing the second connection using the modified criterion based on the timer being activated.
  • the operations of 1030 may be performed according to the methods described herein. In some examples, aspects of the operations of 1030 may be performed by a timer component as described with reference to FIGs. 5 through 8.
  • FIG. 11 shows a flowchart illustrating a method 1100 that supports triggering dropback for latency sensitive service in accordance with aspects of the present disclosure.
  • the operations of method 1100 may be implemented by a UE 115 or its components as described herein.
  • the operations of method 1100 may be performed by a communications manager as described with reference to FIGs. 5 through 8.
  • 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 establish a first connection with a first cell group associated with a first RAT and a second connection with a second cell group associated with a second RAT.
  • the operations of 1105 may be performed according to the methods described herein. In some examples, aspects of the operations of 1105 may be performed by a connection establishment component as described with reference to FIGs. 5 through 8.
  • the UE may determine that a signal quality of the second connection is less than a threshold quality.
  • the operations of 1110 may be performed according to the methods described herein. In some examples, aspects of the operations of 1110 may be performed by a signal quality evaluation component as described with reference to FIGs. 5 through 8.
  • the UE may receive, from a base station corresponding to the first cell group, the second cell group, or both, a data stall indicator based on the signal quality of the second connection.
  • the operations of 1115 may be performed according to the methods described herein. In some examples, aspects of the operations of 1115 may be performed by a data stall indicator component as described with reference to FIGs. 5 through 8.
  • the UE may trigger an RLF for the second connection based on the data stall indicator and the previous data connection being via the second cell group.
  • the operations of 1125 may be performed according to the methods described herein. In some examples, aspects of the operations of 1125 may be performed by an RLF component as described with reference to FIGs. 5 through 8.
  • FIG. 12 shows a flowchart illustrating a method 1200 that supports triggering dropback for latency sensitive service in accordance with aspects of the present disclosure.
  • the operations of method 1200 may be implemented by a UE 115 or its components as described herein.
  • the operations of method 1200 may be performed by a communications manager as described with reference to FIGs. 5 through 8.
  • 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 establish a first connection with a first cell group associated with a first RAT and a second connection with a second cell group associated with a second RAT.
  • the operations of 1205 may be performed according to the methods described herein. In some examples, aspects of the operations of 1205 may be performed by a connection establishment component as described with reference to FIGs. 5 through 8.
  • the UE may determine that a signal quality of the second connection is less than a threshold quality.
  • the operations of 1210 may be performed according to the methods described herein. In some examples, aspects of the operations of 1210 may be performed by a signal quality evaluation component as described with reference to FIGs. 5 through 8.
  • the UE may identify an application running at the UE.
  • the operations of 1220 may be performed according to the methods described herein. In some examples, aspects of the operations of 1220 may be performed by an application identifier as described with reference to FIGs. 5 through 8.
  • the UE may modify a criterion for triggering a measurement report associated with re-establishing the second connection based on the application running at the UE.
  • the operations of 1225 may be performed according to the methods described herein. In some examples, aspects of the operations of 1225 may be performed by a measurement report trigger component as described with reference to FIGs. 5 through 8.
  • FIG. 13 shows a flowchart illustrating a method 1300 that supports triggering dropback for latency sensitive service in accordance with aspects of the present disclosure.
  • the operations of method 1300 may be implemented by a UE 115 or its components as described herein.
  • the operations of method 1300 may be performed by a communications manager as described with reference to FIGs. 5 through 8.
  • 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 modify a criterion for triggering a measurement report associated with re-establishing the second connection based on the signal quality of the second connection.
  • the operations of 1320 may be performed according to the methods described herein. In some examples, aspects of the operations of 1320 may be performed by a measurement report trigger component as described with reference to FIGs. 5 through 8.
  • the UE may communicate data via the first connection with the first cell group associated with the first RAT based on releasing the second connection.
  • the operations of 1325 may be performed according to the methods described herein. In some examples, aspects of the operations of 1325 may be performed by a communication component as described with reference to FIGs. 5 through 8.
  • LTE, LTE-A, LTE-A Pro, or NR may be described for purposes of example, and LTE, LTE-A, LTE-A Pro, or NR terminology may be used in much of the description, the techniques described herein are applicable beyond LTE, LTE-A, LTE-A Pro, 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
  • Information and signals described herein may be represented using any of a variety of different technologies and techniques.
  • data, instructions, commands, information, signals, bits, symbols, and chips that may be referenced throughout the description may be represented by voltages, currents, electromagnetic waves, magnetic fields or particles, optical fields or particles, or any combination thereof.
  • a general-purpose processor may be a microprocessor, but in the alternative, the processor may be any processor, controller, microcontroller, or state machine.
  • a processor may also be implemented as a combination of computing devices (e.g., a combination of a DSP and a microprocessor, multiple microprocessors, one or more microprocessors in conjunction with a DSP core, or any other such configuration) .
  • the functions described herein may be implemented in hardware, software executed by a processor, firmware, or any combination thereof. If implemented in software executed by a processor, the functions may be stored on or transmitted over as one or more instructions or code on a computer-readable medium. Other examples and implementations are within the scope of the disclosure and appended claims. For example, due to the nature of software, functions described herein may be implemented using software executed by a processor, hardware, firmware, hardwiring, or combinations of any of these. Features implementing functions may also be physically located at various positions, including being distributed such that portions of functions are implemented at different physical locations.
  • Computer-readable media includes both non-transitory computer storage media and communication media including any medium that facilitates transfer of a computer program from one place to another.
  • a non-transitory storage medium may be any available medium that may be accessed by a general-purpose or special purpose computer.
  • non-transitory computer-readable media may include RAM, ROM, electrically erasable programmable ROM (EEPROM) , flash memory, compact disk (CD) ROM or other optical disk storage, magnetic disk storage or other magnetic storage devices, or any other non-transitory medium that may be used to carry or store desired program code means in the form of instructions or data structures and that may be accessed by a general-purpose or special-purpose computer, or a general-purpose or special-purpose processor.
  • any connection is properly termed a computer-readable medium.
  • the software is transmitted from a website, server, or other remote source using a coaxial cable, fiber optic cable, twisted pair, digital subscriber line (DSL) , or wireless technologies such as infrared, radio, and microwave
  • the coaxial cable, fiber optic cable, twisted pair, DSL, or wireless technologies such as infrared, radio, and microwave are included in the definition of computer-readable medium.
  • Disk and disc include CD, laser disc, optical disc, digital versatile disc (DVD) , floppy disk and Blu-ray disc where disks usually reproduce data magnetically, while discs reproduce data optically with lasers. Combinations of the above are also included within the scope of computer-readable media.

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Abstract

L'invention concerne des procédés, des systèmes et des dispositifs pour des communications sans fil. Certains systèmes de communication sans fil peuvent prendre en charge une connectivité double (DC) entre différentes technologies d'accès radio (RAT), telles qu'une technologie d'évolution à long terme (LTE) et une nouvelle radio (NR). Dans certains cas, un équipement utilisateur (UE) peut exécuter une application associée à un service sensible à la latence. Toutefois, une connexion de NR peut échouer pour prendre en charge un débit de données utilisé pour le service sensible à la latence. Sur la base de la qualité de signal de la connexion de NR, l'UE peut libérer la connexion de NR et modifier des critères pour déclencher un rapport de mesure pour rétablir la connexion de NR. Par exemple, l'UE peut utiliser un seuil supplémentaire, une valeur de décalage supplémentaire, ou les deux, par comparaison avec un critère de ligne de base pour déclencher la transmission de rapport de mesure. Ces critères modifiés peuvent permettre à l'UE de revenir en arrière et d'utiliser la connexion LTE pour exécuter le service sensible à la latence plutôt que de rétablir la connexion de NR.
PCT/CN2020/092968 2020-05-28 2020-05-28 Déclenchement d'un retour en arrière pour un service sensible à la latence Ceased WO2021237581A1 (fr)

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