WO2021212452A1 - Rétablissement de connectivité de données lors d'une élimination de support après un transfert intercellulaire - Google Patents

Rétablissement de connectivité de données lors d'une élimination de support après un transfert intercellulaire Download PDF

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Publication number
WO2021212452A1
WO2021212452A1 PCT/CN2020/086612 CN2020086612W WO2021212452A1 WO 2021212452 A1 WO2021212452 A1 WO 2021212452A1 CN 2020086612 W CN2020086612 W CN 2020086612W WO 2021212452 A1 WO2021212452 A1 WO 2021212452A1
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WIPO (PCT)
Prior art keywords
cell
detach
bearer
eps bearer
eps
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PCT/CN2020/086612
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English (en)
Inventor
Hao Zhang
Fojian ZHANG
Chaofeng HUI
Jian Li
Yuankun ZHU
Bo Yu
Quanling ZHANG
Tianya LIN
Yi Liu
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Qualcomm Incorporated
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Priority to PCT/CN2020/086612 priority Critical patent/WO2021212452A1/fr
Publication of WO2021212452A1 publication Critical patent/WO2021212452A1/fr

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    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04W—WIRELESS COMMUNICATION NETWORKS
    • H04W60/00—Affiliation to network, e.g. registration; Terminating affiliation with the network, e.g. de-registration
    • H04W60/06—De-registration or detaching
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04W—WIRELESS COMMUNICATION NETWORKS
    • H04W36/00—Hand-off or reselection arrangements
    • H04W36/0005—Control or signalling for completing the hand-off
    • H04W36/0055—Transmission or use of information for re-establishing the radio link
    • H04W36/0069—Transmission or use of information for re-establishing the radio link in case of dual connectivity, e.g. decoupled uplink/downlink
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04W—WIRELESS COMMUNICATION NETWORKS
    • H04W60/00—Affiliation to network, e.g. registration; Terminating affiliation with the network, e.g. de-registration
    • H04W60/04—Affiliation to network, e.g. registration; Terminating affiliation with the network, e.g. de-registration using triggered events

Definitions

  • aspects of the present disclosure generally relate to wireless communication and to techniques and apparatuses for restoration of data connectivity upon bearer removal after a handover.
  • Wireless communication systems are widely deployed to provide various telecommunication services such as telephony, video, data, messaging, and broadcasts.
  • Typical wireless communication systems may employ multiple-access technologies capable of supporting communication with multiple users by sharing available system resources (e.g., bandwidth, transmit power, and/or the like) .
  • multiple-access technologies include code division multiple access (CDMA) systems, time division multiple access (TDMA) systems, frequency-division multiple access (FDMA) systems, orthogonal frequency-division multiple access (OFDMA) systems, single-carrier frequency-division multiple access (SC-FDMA) systems, time division synchronous code division multiple access (TD-SCDMA) systems, and Long Term Evolution (LTE) .
  • LTE/LTE-Advanced is a set of enhancements to the Universal Mobile Telecommunications System (UMTS) mobile standard promulgated by the Third Generation Partnership Project (3GPP) .
  • UMTS Universal Mobile Telecommunications System
  • a wireless communication network may include a number of base stations (BSs) that can support communication for a number of user equipment (UEs) .
  • a user equipment (UE) may communicate with a base station (BS) via the downlink and uplink.
  • the downlink (or forward link) refers to the communication link from the BS to the UE
  • the uplink (or reverse link) refers to the communication link from the UE to the BS.
  • a BS may be referred to as a Node B, a gNB, an access point (AP) , a radio head, a transmit receive point (TRP) , a New Radio (NR) BS, a 5G Node B, and/or the like.
  • New Radio which may also be referred to as 5G, is a set of enhancements to the LTE mobile standard promulgated by the Third Generation Partnership Project (3GPP) .
  • 3GPP Third Generation Partnership Project
  • NR is designed to better support mobile broadband Internet access by improving spectral efficiency, lowering costs, improving services, making use of new spectrum, and better integrating with other open standards using orthogonal frequency division multiplexing (OFDM) with a cyclic prefix (CP) (CP-OFDM) on the downlink (DL) , using CP-OFDM and/or SC-FDM (e.g., also known as discrete Fourier transform spread OFDM (DFT-s-OFDM) ) on the uplink (UL) , as well as supporting beamforming, multiple-input multiple-output (MIMO) antenna technology, and carrier aggregation.
  • OFDM orthogonal frequency division multiplexing
  • SC-FDM e.g., also known as discrete Fourier transform spread OFDM (DFT-s-OFDM)
  • DFT-s-OFDM discrete Fourier transform spread OFDM
  • MIMO multiple-input multiple-output
  • a method of wireless communication may include determining, while registered with a non-standalone (NSA) network, that an evolved packet system (EPS) bearer is removed for the UE, based at least in part on the UE being handed over from a first cell to a second cell.
  • the method may include performing a detach and attach procedure with the second cell based at least in part on the determining that an EPS bearer is removed.
  • NSA non-standalone
  • a UE for wireless communication may include memory and one or more processors coupled to the memory.
  • the one or more processors may be operatively, electronically, communicatively, or otherwise coupled to the memory.
  • the memory may include instructions executable by the one or more processors to cause the UE to determine, while registered with an NSA network, that an EPS bearer is removed for the UE, based at least in part on the UE being handed over from a first cell to a second cell, and perform a detach and attach procedure with the second cell based at least in part on the determining that an EPS bearer is removed.
  • a non-transitory computer-readable medium may store one or more instructions for wireless communication.
  • the one or more instructions when executed by one or more processors of a UE, may cause the UE to determine, while registered with an NSA network, that an EPS bearer is removed for the UE, based at least in part on the UE being handed over from a first cell to a second cell, and perform a detach and attach procedure with the second cell based at least in part on the determining that an EPS bearer is removed.
  • an apparatus for wireless communication may include means for determining, while registered with an NSA network, that an EPS bearer is removed for the apparatus, based at least in part on the apparatus being handed over from a first cell to a second cell, and means for performing a detach and attach procedure with the second cell based at least in part on the determining that an EPS bearer is removed.
  • aspects generally include a method, apparatus, system, computer program product, non-transitory computer-readable medium, user equipment, base station, wireless communication device, and/or processing system as substantially described herein with reference to and as illustrated by the drawings and specification.
  • Fig. 1 is a block diagram conceptually illustrating an example of a wireless communication network, in accordance with various aspects of the present disclosure.
  • Fig. 2 is a block diagram conceptually illustrating an example of a base station in communication with a user equipment (UE) in a wireless communication network, in accordance with various aspects of the present disclosure.
  • UE user equipment
  • Fig. 3 is a diagram illustrating an example of a loss of data service upon bearer removal after a handover, in accordance with various aspects of the present disclosure.
  • Fig. 4 is a diagram illustrating an example of restoring data service upon bearer removal, in accordance with various aspects of the present disclosure.
  • Fig. 5 is a diagram illustrating an example of restoring data service upon bearer removal, in accordance with various aspects of the present disclosure.
  • Fig. 6 is a diagram illustrating an example process performed, for example, by a UE, in accordance with various aspects of the present disclosure.
  • Fig. 1 is a diagram illustrating a wireless network 100 in which aspects of the present disclosure may be practiced.
  • the wireless network 100 may be an LTE network or some other wireless network, such as a 5G or NR network.
  • the wireless network 100 may include a number of BSs 110 (shown as BS 110a, BS 110b, BS 110c, and BS 110d) and other network entities.
  • a BS is an entity that communicates with user equipment (UEs) and may also be referred to as a base station, a NR BS, a Node B, a gNB, a 5G node B (NB) , an access point, a transmit receive point (TRP) , and/or the like.
  • Each BS may provide communication coverage for a particular geographic area.
  • the term “cell” can refer to a coverage area of a BS and/or a BS subsystem serving this coverage area, depending on the context in which the term is used.
  • a BS may provide communication coverage for a macro cell, a pico cell, a femto cell, and/or another type of cell.
  • a macro cell may cover a relatively large geographic area (e.g., several kilometers in radius) and may allow unrestricted access by UEs with service subscription.
  • a pico cell may cover a relatively small geographic area and may allow unrestricted access by UEs with service subscription.
  • a femto cell may cover a relatively small geographic area (e.g., a home) and may allow restricted access by UEs having association with the femto cell (e.g., UEs in a closed subscriber group (CSG) ) .
  • a BS for a macro cell may be referred to as a macro BS.
  • a BS for a pico cell may be referred to as a pico BS.
  • a BS for a femto cell may be referred to as a femto BS or a home BS.
  • a BS 110a may be a macro BS for a macro cell 102a
  • a BS 110b may be a pico BS for a pico cell 102b
  • a BS 110c may be a femto BS for a femto cell 102c.
  • a BS may support one or multiple (e.g., three) cells.
  • eNB base station
  • NR BS NR BS
  • gNB gNode B
  • AP AP
  • node B node B
  • 5G NB 5G NB
  • cell may be used interchangeably herein.
  • a cell may not necessarily be stationary, and the geographic area of the cell may move according to the location of a mobile BS.
  • the BSs may be interconnected to one another and/or to one or more other BSs or network nodes (not shown) in the wireless network 100 through various types of backhaul interfaces such as a direct physical connection, a virtual network, and/or the like using any suitable transport network.
  • Wireless network 100 may also include relay stations.
  • a relay station is an entity that can receive a transmission of data from an upstream station (e.g., a BS or a UE) and send a transmission of the data to a downstream station (e.g., a UE or a BS) .
  • a relay station may also be a UE that can relay transmissions for other UEs.
  • a relay station 110d may communicate with macro BS 110a and a UE 120d in order to facilitate communication between BS 110a and UE 120d.
  • a relay station may also be referred to as a relay BS, a relay base station, a relay, and/or the like.
  • Wireless network 100 may be a heterogeneous network that includes BSs of different types, e.g., macro BSs, pico BSs, femto BSs, relay BSs, and/or the like. These different types of BSs may have different transmit power levels, different coverage areas, and different impacts on interference in wireless network 100.
  • macro BSs may have a high transmit power level (e.g., 5 to 40 watts) whereas pico BSs, femto BSs, and relay BSs may have lower transmit power levels (e.g., 0.1 to 2 watts) .
  • a network controller 130 may couple to a set of BSs and may provide coordination and control for these BSs.
  • Network controller 130 may communicate with the BSs via a backhaul.
  • the BSs may also communicate with one another, e.g., directly or indirectly via a wireless or wireline backhaul.
  • UEs 120 may be dispersed throughout wireless network 100, and each UE may be stationary or mobile.
  • a UE may also be referred to as an access terminal, a terminal, a mobile station, a subscriber unit, a station, and/or the like.
  • a UE may be a cellular phone (e.g., a smart phone) , a personal digital assistant (PDA) , a wireless modem, a wireless communication device, a handheld device, a laptop computer, a cordless phone, a wireless local loop (WLL) station, a tablet, a camera, a gaming device, a netbook, a smartbook, an ultrabook, a medical device or equipment, biometric sensors/devices, wearable devices (smart watches, smart clothing, smart glasses, smart wrist bands, smart jewelry (e.g., smart ring, smart bracelet) ) , an entertainment device (e.g., a music or video device, or a satellite radio) , a vehicular component or sensor, smart meters/sensors, industrial manufacturing equipment, a global positioning system device, or any other suitable device that is configured to communicate via a wireless or wired medium.
  • PDA personal digital assistant
  • WLL wireless local loop
  • Some UEs may be considered machine-type communication (MTC) or evolved or enhanced machine-type communication (eMTC) UEs.
  • MTC and eMTC UEs include, for example, robots, drones, remote devices, sensors, meters, monitors, location tags, and/or the like, that may communicate with a base station, another device (e.g., remote device) , or some other entity.
  • a wireless node may provide, for example, connectivity for or to a network (e.g., a wide area network such as Internet or a cellular network) via a wired or wireless communication link.
  • Some UEs may be considered Internet-of-Things (IoT) devices, and/or may be implemented as NB-IoT (narrowband internet of things) devices.
  • IoT Internet-of-Things
  • NB-IoT narrowband internet of things
  • UE 120 may be included inside a housing that houses components of UE 120, such as processor components, memory components, and/or the like.
  • the processor components and the memory components may be coupled together.
  • the processor components e.g., one or more processors
  • the memory components e.g., a memory
  • the processor components and the memory components may be operatively coupled, communicatively coupled, electronically coupled, electrically coupled, and/or the like.
  • any number of wireless networks may be deployed in a given geographic area.
  • Each wireless network may support a particular radio access technology (RAT) and may operate on one or more frequencies.
  • a RAT may also be referred to as a radio technology, an air interface, and/or the like.
  • a frequency may also be referred to as a carrier, a frequency channel, and/or the like.
  • Each frequency may support a single RAT in a given geographic area in order to avoid interference between wireless networks of different RATs.
  • NR or 5G RAT networks may be deployed.
  • two or more UEs 120 may communicate directly using one or more sidelink channels (e.g., without using a base station 110 as an intermediary to communicate with one another) .
  • the UEs 120 may communicate using peer-to-peer (P2P) communications, device-to-device (D2D) communications, a vehicle-to-everything (V2X) protocol (e.g., which may include a vehicle-to-vehicle (V2V) protocol, a vehicle-to-infrastructure (V2I) protocol, and/or the like) , a mesh network, and/or the like.
  • V2X vehicle-to-everything
  • the UE 120 may perform scheduling operations, resource selection operations, and/or other operations described elsewhere herein as being performed by the base station 110.
  • Fig. 1 is provided as an example. Other examples may differ from what is described with regard to Fig. 1.
  • Fig. 2 shows a block diagram of a design 200 of base station 110 and UE 120, which may be one of the base stations and one of the UEs in Fig. 1.
  • Base station 110 may be equipped with T antennas 234a through 234t
  • UE 120 may be equipped with R antennas 252a through 252r, where in general T ⁇ 1 and R ⁇ 1.
  • a transmit processor 220 may receive data from a data source 212 for one or more UEs, select one or more modulation and coding schemes (MCS) for each UE based at least in part on channel quality indicators (CQIs) received from the UE, process (e.g., encode and modulate) the data for each UE based at least in part on the MCS (s) selected for the UE, and provide data symbols for all UEs. Transmit processor 220 may also process system information (e.g., for semi-static resource partitioning information (SRPI) and/or the like) and control information (e.g., CQI requests, grants, upper layer signaling, and/or the like) and provide overhead symbols and control symbols.
  • MCS modulation and coding schemes
  • Transmit processor 220 may also generate reference symbols for reference signals (e.g., the cell-specific reference signal (CRS) ) and synchronization signals (e.g., the primary synchronization signal (PSS) and secondary synchronization signal (SSS) ) .
  • a transmit (TX) multiple-input multiple-output (MIMO) processor 230 may perform spatial processing (e.g., precoding) on the data symbols, the control symbols, the overhead symbols, and/or the reference symbols, if applicable, and may provide T output symbol streams to T modulators (MODs) 232a through 232t. Each modulator 232 may process a respective output symbol stream (e.g., for OFDM and/or the like) to obtain an output sample stream.
  • TX transmit
  • MIMO multiple-input multiple-output
  • Each modulator 232 may process a respective output symbol stream (e.g., for OFDM and/or the like) to obtain an output sample stream.
  • Each modulator 232 may further process (e.g., convert to analog, amplify, filter, and upconvert) the output sample stream to obtain a downlink signal.
  • T downlink signals from modulators 232a through 232t may be transmitted via T antennas 234a through 234t, respectively.
  • the synchronization signals can be generated with location encoding to convey additional information.
  • antennas 252a through 252r may receive the downlink signals from base station 110 and/or other base stations and may provide received signals to demodulators (DEMODs) 254a through 254r, respectively.
  • Each demodulator 254 may condition (e.g., filter, amplify, downconvert, and digitize) a received signal to obtain input samples.
  • Each demodulator 254 may further process the input samples (e.g., for OFDM and/or the like) to obtain received symbols.
  • a MIMO detector 256 may obtain received symbols from all R demodulators 254a through 254r, perform MIMO detection on the received symbols if applicable, and provide detected symbols.
  • a receive processor 258 may process (e.g., demodulate and decode) the detected symbols, provide decoded data for UE 120 to a data sink 260, and provide decoded control information and system information to a controller/processor 280.
  • a channel processor may determine reference signal received power (RSRP) , received signal strength indicator (RSSI) , reference signal received quality (RSRQ) , channel quality indicator (CQI) , and/or the like.
  • RSRP reference signal received power
  • RSSI received signal strength indicator
  • RSRQ reference signal received quality
  • CQI channel quality indicator
  • one or more components of UE 120 may be included in a housing.
  • Network controller 130 may include communication unit 294, controller/processor 290, and memory 292.
  • Network controller 130 may include, for example, one or more devices in a core network.
  • Network controller 130 may communicate with base station 110 via communication unit 294.
  • a transmit processor 264 may receive and process data from a data source 262 and control information (e.g., for reports comprising RSRP, RSSI, RSRQ, CQI, and/or the like) from controller/processor 280. Transmit processor 264 may also generate reference symbols for one or more reference signals. The symbols from transmit processor 264 may be precoded by a TX MIMO processor 266 if applicable, further processed by modulators 254a through 254r (e.g., for DFT-s-OFDM, CP-OFDM, and/or the like) , and transmitted to base station 110.
  • the UE 120 includes a transceiver.
  • the transceiver may include any combination of antenna (s) 252, modulators and/or demodulators 254, MIMO detector 256, receive processor 258, transmit processor 264, and/or TX MIMO processor 266.
  • the transceiver may be used by a processor (e.g., controller/processor 280) and memory 282 to perform aspects of any of the methods described herein, for example, as described with reference to Figs. 3-6.
  • the uplink signals from UE 120 and other UEs may be received by antennas 234, processed by demodulators 232, detected by a MIMO detector 236 if applicable, and further processed by a receive processor 238 to obtain decoded data and control information sent by UE 120.
  • Receive processor 238 may provide the decoded data to a data sink 239 and the decoded control information to controller/processor 240.
  • Base station 110 may include communication unit 244 and communicate to network controller 130 via communication unit 244. In some aspects, the base station 110 includes a transceiver.
  • the transceiver may include any combination of antenna (s) 234, modulators and/or demodulators 232, MIMO detector 236, receive processor 238, transmit processor 220, and/or TX MIMO processor 230.
  • the transceiver may be used by a processor (e.g., controller/processor 240) and memory 242 to perform aspects of any of the methods described herein, for example, as described with reference to Figs. 3-6.
  • Controller/processor 240 of base station 110, controller/processor 280 of UE 120, and/or any other component (s) of Fig. 2 may perform one or more techniques associated with restoration of data connectivity upon bearer removal after a handover, as described in more detail elsewhere herein.
  • controller/processor 240 of base station 110, controller/processor 280 of UE 120, and/or any other component (s) of Fig. 2 may perform or direct operations of, for example, process 600 of Fig. 6, and/or other processes as described herein.
  • Memories 242 and 282 may store data and program codes for base station 110 and UE 120, respectively.
  • memory 242 and/or memory 282 may comprise a non-transitory computer-readable medium storing one or more instructions for wireless communication.
  • the one or more instructions when executed (e.g., directly, or after compiling, converting, interpreting, and/or the like) by one or more processors of the base station 110 and/or the UE 120, may perform or direct operations of, for example, process 600 of Fig. 6, and/or other processes as described herein.
  • executing instructions may include running the instructions, converting the instructions, compiling the instructions, interpreting the instructions, and/or the like.
  • a scheduler 246 may schedule UEs for data transmission on the downlink and/or uplink.
  • UE 120 may include means for determining, while registered with a non-standalone (NSA) network, that an evolved packet system (EPS) bearer is removed for the UE, based at least in part on the UE being handed over from a first cell to a second cell, means for performing a detach and attach procedure with the second cell based at least in part on the determining that an EPS bearer is removed, and/or the like.
  • NSA non-standalone
  • EPS evolved packet system
  • such means may include one or more components of UE 120 described in connection with Fig. 2, such as controller/processor 280, transmit processor 264, TX MIMO processor 266, MOD 254, antenna 252, DEMOD 254, MIMO detector 256, receive processor 258, and/or the like.
  • Fig. 2 is provided as an example. Other examples may differ from what is described with regard to Fig. 2.
  • Fig. 3 is a diagram illustrating an example 300 of a loss of data service upon bearer removal after a handover, in accordance with various aspects of the present disclosure.
  • Fig. 3 shows a signaling diagram for a UE (e.g., a UE 120 depicted in Figs. 1 and 2) registered with an NSA network. More specifically, Fig. 3 shows a UE modem of the UE.
  • a UE e.g., a UE 120 depicted in Figs. 1 and 2
  • Fig. 3 shows a UE modem of the UE.
  • An NSA network may be supported by existing LTE infrastructure and may provide access to the Internet for the UE.
  • the UE may be attached to a first cell that is NSA capable (e.g., LTE Cell 1 shown in Fig. 3) and have multiple active EPS bearers.
  • An EPS bearer enables the UE to transmit data to and receive data from a packet data network (PDN) to which the UE may connect.
  • PDN packet data network
  • the EPS bearer may be considered a tunnel between the UE and a packet gateway to the Internet, and the EPS bearer may be associated with a quality of service (QoS) .
  • QoS quality of service
  • EPS bearers 5, 6, and 7 may be active for the UE modem.
  • the UE may determine that the UE is to be handed over from the first cell to a second cell (e.g., LTE Cell 2 shown in Fig. 3) that is NSA capable.
  • a second cell e.g., LTE Cell 2 shown in Fig. 3
  • the UE modem may transmit, to the first cell, a measurement report for the second cell.
  • the UE modem may receive a radio resource control (RRC) reconfiguration message from the first cell.
  • RRC radio resource control
  • the UE modem may be handed over to the second cell based at least in part on the RRC reconfiguration message. However, at some point during or after the handover, an EPS bearer has been removed.
  • the UE modem may receive an RRC reconfiguration message indicating that EPS bearers 6 and 7 are active. Note that EPS bearer 5 is not indicated. As shown by reference number 325, the UE modem may determine that EPS bearer 5 is deactivated, because it is missing from active bearers indicated by the RRC reconfiguration message. Without EPS bearer 5, the UE modem may experience a loss of a data service.
  • the UE modem may attempt to recover the data service using a procedure.
  • the procedure may include transmitting a PDN connectivity request to the second cell.
  • the procedure may include starting a timer (e.g., timer T3482) when the PDN connectivity request is transmitted.
  • the UE modem may not receive a response (e.g., message associated with bearer 5) before the timer expires.
  • the UE modem may not be able to activate an EPS bearer context for bearer 5.
  • the UE modem may repeat the procedure of transmitting the PDN connectivity request and not receiving a response before the timer expires.
  • the procedure continues in a loop a number of times (e.g., five times) , and the UE is not able to restore the data service that was lost when bearer 5 was removed after the handover.
  • Fig. 3 is provided as an example. Other examples may differ from what is described with respect to Fig. 3.
  • Fig. 4 is a diagram illustrating an example 400 of restoring data service upon bearer removal, in accordance with various aspects of the present disclosure.
  • Fig. 4 includes some signals that are in the signaling diagram shown in Fig. 3.
  • the UE modem may restore a data service lost from removal of an EPS bearer by performing a detach and attach procedure after determining that the EPS bearer was removed based at least in part on a handover from a first cell to a second cell. For example, the UE modem may determine that an EPS bearer that was once active for the first cell is not listed in an RRC reconfiguration message as being active for the second cell. Based at least in part on this determination, the UE modem may transmit a detach request to the second cell, as shown by reference number 405. As shown by reference number 410, the UE modem may receive a detach accept message. As shown by reference number 415, the UE modem may transmit an attach request to the second cell, and as shown by reference number 420, the UE modem may receive an attach accept message. In some aspects, the attach request may involve or may follow a random access channel procedure.
  • the UE modem may be NR capable while registered with the NSA network.
  • the UE modem may transmit the attach request with an indication of support for dual connectivity with New Radio (DCNR) , which may enable the UE modem to access an NR data service.
  • DCNR New Radio
  • the detach and attach procedure may resolve whatever issue caused the removal of an EPS bearer during or after the handover.
  • the EPS bearer that was removed may have been a default EPS bearer (established during an attach procedure) or a dedicated bearer with a special QoS.
  • the UE modem may determine to perform the attach and detach procedure based at least in part on whether the EPS bearer is a default bearer and/or how much the EPS bearer was used for a data service. As shown by reference number 425, the UE modem may transmit a PDN connectivity request.
  • the UE modem may activate one or more EPS bearers by transmitting an activate default EPS bearer context request to the second cell, as shown by reference number 430.
  • the UE modem may receive an activate default EPS bearer context accept message. In this way, the UE modem has activated a removed bearer, such as bearer 5 shown in Fig. 4, and restored a data service for the UE.
  • a removed bearer such as bearer 5 shown in Fig. 4
  • Fig. 4 is provided as an example. Other examples may differ from what is described with respect to Fig. 4.
  • Fig. 5 is a diagram illustrating an example 500 of restoring data service upon bearer removal, in accordance with various aspects of the present disclosure.
  • Fig. 5 includes some signals that are in the signaling diagram shown in Fig. 4.
  • the UE modem may attempt to restore a data service by transmitting a PDN connectivity request, as shown by reference number 505, before performing the detach and attach procedure.
  • the UE modem may determine that no response to the PDN connectivity request is received before a timer (e.g., T3482) expires.
  • the UE modem may proceed with performing the detach and attach procedure as described in connection with reference numbers 405 through 420 shown in Fig. 4.
  • the UE modem restores a data service by transmitting the PDN connectivity request after the detach and attach procedure, as shown by reference number 425 in Fig. 4.
  • Fig. 5 is provided as an example. Other examples may differ from what is described with respect to Fig. 5.
  • Fig. 6 is a diagram illustrating an example process 600 performed, for example, by a UE, in accordance with various aspects of the present disclosure.
  • Example process 600 is an example where the UE (e.g., a UE 120 depicted in Figs. 1 and 2, the UE modem depicted in Figs. 4 and 5, and/or the like) performs operations associated with restoration of data connectivity upon bearer removal after a handover.
  • the UE e.g., a UE 120 depicted in Figs. 1 and 2, the UE modem depicted in Figs. 4 and 5, and/or the like
  • process 600 may include determining, while registered with an NSA network, that an EPS bearer is removed for the UE, based at least in part on the UE being handed over from a first cell to a second cell (block 610) .
  • the UE e.g., using receive processor 258, transmit processor 264, controller/processor 280, memory 282, and/or the like
  • process 600 may include performing a detach and attach procedure with the second cell based at least in part on the determining that an EPS bearer is removed (block 620) .
  • the UE e.g., using receive processor 258, transmit processor 264, controller/processor 280, memory 282, and/or the like
  • Process 600 may include additional aspects, such as any single aspect or any combination of aspects described below and/or in connection with one or more other processes described elsewhere herein.
  • determining that an EPS bearer is removed includes receiving a radio resource control reconfiguration message from the second cell indicating one or more bearers, and determining that an EPS bearer that was active for the UE before the UE was handed over is missing from the one or more bearers.
  • performing the detach and attach procedure includes performing the detach and attach procedure based at least in part on expiration of a timer for reestablishing a removed EPS bearer.
  • the timer is a T3482 timer.
  • performing the detach and attach procedure includes transmitting a detach request to the second cell, and transmitting an attach request to the second cell based at least in part on receiving a detach accept message from the second cell.
  • the attach request indicates a capability for dual connectivity.
  • the attach request indicates a capability for DCNR.
  • process 600 includes transmitting a PDN connectivity request to the second cell after performing the detach and attach procedure with the second cell.
  • process 600 includes transmitting an activate default EPS bearer context request after transmitting the PDN connectivity request, and receiving an activate default EPS bearer context accept message.
  • process 600 may include additional blocks, fewer blocks, different blocks, or differently arranged blocks than those depicted in Fig. 6. Additionally, or alternatively, two or more of the blocks of process 600 may be performed in parallel.
  • ком ⁇ онент is intended to be broadly construed as hardware, firmware, and/or a combination of hardware and software.
  • a processor is implemented in hardware, firmware, and/or a combination of hardware and software.
  • satisfying a threshold may, depending on the context, refer to a value being greater than the threshold, greater than or equal to the threshold, less than the threshold, less than or equal to the threshold, equal to the threshold, not equal to the threshold, and/or the like.
  • “at least one of: a, b, or c” is intended to cover a, b, c, a-b, a-c, b-c, and a-b-c, as well as any combination with multiples of the same element (e.g., a-a, a-a-a, a-a-b, a-a-c, a-b-b, a-c-c, b-b, b-b-b, b-b-c, c-c, and c-c-c or any other ordering of a, b, and c) .
  • the terms “has, ” “have, ” “having, ” and/or the like are intended to be open-ended terms. Further, the phrase “based on” is intended to mean “based, at least in part, on” unless explicitly stated otherwise.

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

Abstract

D'une manière générale, divers aspects de la présente divulgation se rapportent aux communications sans fil. Selon certains aspects, un équipement utilisateur (EU) peut déterminer, tandis qu'il est enregistré auprès d'un réseau non autonome, qu'un support de système de paquets évolué (EPS) est éliminé pour l'EU, au moins en partie sur la base du transfert de l'EU d'une première cellule à une seconde cellule, et effectuer une procédure de détachement et d'attachement avec la seconde cellule, au moins en partie sur la base de la détermination de l'élimination d'un support d'EPS. La divulgation concerne également de nombreux autres aspects.
PCT/CN2020/086612 2020-04-24 2020-04-24 Rétablissement de connectivité de données lors d'une élimination de support après un transfert intercellulaire WO2021212452A1 (fr)

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US20140301308A1 (en) * 2013-04-04 2014-10-09 Lg Electronics Inc. Method and apparatus for performing plural network attachment procedures to support plural connections in a wireless access system
CN107534911A (zh) * 2015-06-01 2018-01-02 英特尔公司 使用组演进分组***（eps）承载的越区切换
CN107852658A (zh) * 2015-07-31 2018-03-27 日本电气株式会社 基站设备及其方法

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US20140301308A1 (en) * 2013-04-04 2014-10-09 Lg Electronics Inc. Method and apparatus for performing plural network attachment procedures to support plural connections in a wireless access system
CN107534911A (zh) * 2015-06-01 2018-01-02 英特尔公司 使用组演进分组***（eps）承载的越区切换
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