WO2019061265A1 - Techniques et appareils de repli d'appel vocal de 5g/nr à 4g/lte - Google Patents

Techniques et appareils de repli d'appel vocal de 5g/nr à 4g/lte Download PDF

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Publication number
WO2019061265A1
WO2019061265A1 PCT/CN2017/104300 CN2017104300W WO2019061265A1 WO 2019061265 A1 WO2019061265 A1 WO 2019061265A1 CN 2017104300 W CN2017104300 W CN 2017104300W WO 2019061265 A1 WO2019061265 A1 WO 2019061265A1
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Prior art keywords
lte
gbr
base station
call
handover
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PCT/CN2017/104300
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English (en)
Inventor
Xipeng Zhu
Juan Zhang
Gavin Bernard Horn
Haris Zisimopoulos
Srinivasan Balasubramanian
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Qualcomm Incorporated
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Priority to PCT/CN2017/104300 priority Critical patent/WO2019061265A1/fr
Publication of WO2019061265A1 publication Critical patent/WO2019061265A1/fr

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    • 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
    • H04W36/0066—Transmission or use of information for re-establishing the radio link of control information between different types of networks in order to establish a new radio link in the target network

Definitions

  • aspects of the present disclosure generally relate to wireless communication, and more particularly to techniques and apparatuses for 5G/New Radio (NR) to 4G/Long Term Evolution (LTE) voice call fallback.
  • NR New Radio
  • LTE Long Term Evolution
  • 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) .
  • 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 performed by a user equipment may include receiving a connection configuration message to establish a guaranteed bit rate (GBR) quality of service (QoS) flow for a call that is undergoing fallback from a 5G/New Radio (NR) base station to a 4G/Long Term Evolution (LTE) base station, wherein the connection configuration message does not include GBR radio bearer information for the GBR QoS flow; providing an indication to an upper protocol layer of the UE that establishment of the flow is successful; and performing the call using a 4G/LTE bearer via the 4G/LTE base station after the fallback to the 4G/LTE base station.
  • GBR guaranteed bit rate
  • QoS quality of service
  • a user equipment for wireless communication may include memory and one or more processors operatively coupled to the memory.
  • the memory and the one or more processors may be configured to receive a connection configuration message to establish a guaranteed bit rate (GBR) quality of service (QoS) flow for a call that is undergoing fallback from a 5G/New Radio (NR) base station to a 4G/Long Term Evolution (LTE) base station, wherein the connection configuration message does not include GBR radio bearer information for the GBR QoS flow; provide an indication to an upper protocol layer of the UE that establishment of the flow is successful; and perform the call using a 4G/LTE bearer via the 4G/LTE base station after the fallback to the 4G/LTE base station.
  • GBR guaranteed bit rate
  • QoS quality of service
  • 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 user equipment, may cause the one or more processors to receive a connection configuration message to establish a guaranteed bit rate (GBR) quality of service (QoS) flow for a call that is undergoing fallback from a 5G/New Radio (NR) base station to a 4G/Long Term Evolution (LTE) base station, wherein the connection configuration message does not include GBR radio bearer information for the GBR QoS flow; provide an indication to an upper protocol layer of the UE that establishment of the flow is successful; and perform the call using a 4G/LTE bearer via the 4G/LTE base station after the fallback to the 4G/LTE base station.
  • GBR guaranteed bit rate
  • QoS quality of service
  • an apparatus for wireless communication may include means for receiving a connection configuration message to establish a guaranteed bit rate (GBR) quality of service (QoS) flow for a call that is undergoing fallback from a 5G/New Radio (NR) base station to a 4G/Long Term Evolution (LTE) base station, wherein the connection configuration message does not include GBR radio bearer information for the GBR QoS flow; means for providing an indication to an upper protocol layer of the UE that establishment of the flow is successful; and means for performing the call using a 4G/LTE bearer via the 4G/LTE base station after the fallback to the 4G/LTE base station.
  • GBR guaranteed bit rate
  • QoS quality of service
  • a method of wireless communication performed by a 5G/NR base station may include providing a connection configuration message to establish a guaranteed bit rate (GBR) quality of service (QoS) flow for a call that is undergoing fallback from the 5G/NR base station to a 4G/Long Term Evolution (LTE) base station, wherein the connection configuration message does not include GBR radio bearer information for the GBR QoS flow based at least in part on the call undergoing the fallback to the 4G/LTE base station; providing a first handover message to a 5G/NR core network to cause handover of the call to the 4G/LTE base station, wherein the first handover message does not include the GBR radio bearer information for the GBR QoS flow; and providing a second handover message toward a user equipment associated with the call, wherein the second handover message includes information identifying a 4G/LTE GBR radio bearer for the call.
  • GBR guaranteed bit rate
  • QoS quality of service
  • a 5G/NR base station for wireless communication may include memory and one or more processors operatively coupled to the memory.
  • the memory and the one or more processors may be configured to provide a connection configuration message to establish a guaranteed bit rate (GBR) quality of service (QoS) flow for a call that is undergoing fallback from the 5G/NR base station to a 4G/Long Term Evolution (LTE) base station, wherein the connection configuration message does not include GBR radio bearer information for the GBR QoS flow based at least in part on the call undergoing the fallback to the 4G/LTE base station; provide a first handover message to a 5G/NR core network to cause handover of the call to the 4G/LTE base station, wherein the first handover message does not include the GBR radio bearer information for the GBR QoS flow; and provide a second handover message toward a user equipment associated with the call, wherein the second handover message includes information identifying a 4G/LTE GBR radio bearer for
  • 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 5G/NR base station, may cause the one or more processors to provide a connection configuration message to establish a guaranteed bit rate (GBR) quality of service (QoS) flow for a call that is undergoing fallback from the 5G/NR base station to a 4G/Long Term Evolution (LTE) base station, wherein the connection configuration message does not include GBR radio bearer information for the GBR QoS flow based at least in part on the call undergoing the fallback to the 4G/LTE base station; provide a first handover message to a 5G/NR core network to cause handover of the call to the 4G/LTE base station, wherein the first handover message does not include the GBR radio bearer information for the GBR QoS flow; and provide a second handover message toward a user equipment associated with the call, wherein the second handover message includes information identifying
  • an apparatus for wireless communication may include means for providing a connection configuration message to establish a guaranteed bit rate (GBR) quality of service (QoS) flow for a call that is undergoing fallback from the 5G/NR base station to a 4G/Long Term Evolution (LTE) base station, wherein the connection configuration message does not include GBR radio bearer information for the GBR QoS flow based at least in part on the call undergoing the fallback to the 4G/LTE base station; means for providing a first handover message to a 5G/NR core network to cause handover of the call to the 4G/LTE base station, wherein the first handover message does not include the GBR radio bearer information for the GBR QoS flow; and means for providing a second handover message toward a user equipment associated with the call, wherein the second handover message includes information identifying a 4G/LTE GBR radio bearer for the call.
  • GBR guaranteed bit rate
  • QoS quality of service
  • aspects generally include a method, apparatus, system, computer program product, non-transitory computer-readable medium, user equipment, base station, access point, wireless communication device, and processing system as substantially described herein with reference to and as illustrated by the accompanying drawings and specification.
  • Fig. 1 is a block diagram conceptually illustrating an example of a wireless communication network, in accordance with certain 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 certain aspects of the present disclosure.
  • UE user equipment
  • Fig. 3 is a block diagram conceptually illustrating an example of a frame structure in a wireless communication network, in accordance with certain aspects of the present disclosure.
  • Fig. 4 is a block diagram conceptually illustrating two example subframe formats with the normal cyclic prefix, in accordance with certain aspects of the present disclosure.
  • Fig. 5 illustrates an example logical architecture of a distributed radio access network (RAN) , in accordance with certain aspects of the present disclosure.
  • RAN radio access network
  • Fig. 6 illustrates an example physical architecture of a distributed RAN, in accordance with certain aspects of the present disclosure.
  • Figs. 7A and 7B are call flow diagrams illustrating an example of Voice over NR (VoNR) to Voice over LTE (VoLTE) fallback, in accordance with various aspects of the present disclosure.
  • VoIP Voice over NR
  • VoIP Voice over LTE
  • Fig. 8 is a diagram illustrating an example process performed, for example, by a user equipment, in accordance with various aspects of the present disclosure.
  • Fig. 9 is a diagram illustrating an example process performed, for example, by a 5G/NR base station, in accordance with various aspects of the present disclosure.
  • aspects may be described herein using terminology commonly associated with 3G and/or 4G wireless technologies, aspects of the present disclosure can be applied in other generation-based communication systems, such as 5G and later, including NR technologies.
  • Fig. 1 is a diagram illustrating a network 100 in which aspects of the present disclosure may be practiced.
  • the network 100 may be an LTE network or some other wireless network, such as a 5G or NR network.
  • Wireless network 100 may include a number of BSs 110 (shown as BS 110a, BS 110b, BS 110c, and BS 110d) and other network entities.
  • a BS is an entity that communicates with user equipment (UEs) and may also be referred to as a base station, a NR BS, a Node B, a gNB, a 5G 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 access network 100 through various types of backhaul interfaces such as a direct physical connection, a virtual network, and/or the like using any suitable transport network.
  • Wireless network 100 may also include relay stations.
  • a relay station is an entity that can receive a transmission of data from an upstream station (e.g., a BS or a UE) and send a transmission of the data to a downstream station (e.g., a UE or a BS) .
  • a relay station may also be a UE that can relay transmissions for other UEs.
  • a relay station 110d may communicate with macro BS 110a and a UE 120d in order to facilitate communication between BS 110a and UE 120d.
  • a relay station may also be referred to as a relay BS, a relay base station, a relay, and/or the like.
  • Wireless network 100 may be a heterogeneous network that includes BSs of different types, e.g., macro BSs, pico BSs, femto BSs, relay BSs, and/or the like. These different types of BSs may have different transmit power levels, different coverage areas, and different impact on interference in wireless network 100.
  • macro BSs may have a high transmit power level (e.g., 5 to 40 Watts) whereas pico BSs, femto BSs, and relay BSs may have lower transmit power levels (e.g., 0.1 to 2 Watts) .
  • a network controller 130 may couple to a set of BSs and may provide coordination and control for these BSs.
  • Network controller 130 may communicate with the BSs via a backhaul.
  • network controller 130 may be, may include, or may be a part of a 5G/NR core network.
  • 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, medical device or equipment, biometric sensors/devices, wearable devices (smart watches, smart clothing, smart glasses, smart wrist bands, smart jewelry (e.g., smart ring, smart bracelet)) , an entertainment device (e.g., a music or video device, or a satellite radio) , a vehicular component or sensor, smart meters/sensors, industrial manufacturing equipment, a global positioning system device, or any other suitable device that is configured to communicate via a wireless or wired medium.
  • PDA personal digital assistant
  • WLL wireless local loop
  • MTC and eMTC UEs include, for example, robots, drones, remote devices, such as sensors, meters, monitors, location tags, 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 may be implemented as NB-IoT (narrowband internet of things) devices. Some UEs may be considered a Customer Premises Equipment (CPE) .
  • UE 120 may be included inside a housing that houses components of UE 120, such as processor components, memory components, and/or the like.
  • any number of wireless networks may be deployed in a given geographic area.
  • Each wireless network may support a particular RAT and may operate on one or more frequencies.
  • a RAT may also be referred to as a radio technology, an air interface, and/or the like.
  • a frequency may also be referred to as a carrier, a frequency channel, and/or the like.
  • Each frequency may support a single RAT in a given geographic area in order to avoid interference between wireless networks of different RATs.
  • NR or 5G RAT networks may be deployed.
  • a scheduling entity e.g., a base station
  • the scheduling entity may be responsible for scheduling, assigning, reconfiguring, and releasing resources for one or more subordinate entities. That is, for scheduled communication, subordinate entities utilize resources allocated by the scheduling entity.
  • Base stations are not the only entities that may function as a scheduling entity. That is, in some examples, a UE may function as a scheduling entity, scheduling resources for one or more subordinate entities (e.g., one or more other UEs) . In this example, the UE is functioning as a scheduling entity, and other UEs utilize resources scheduled by the UE for wireless communication.
  • a UE may function as a scheduling entity in a peer-to-peer (P2P) network, and/or in a mesh network. In a mesh network example, UEs may optionally communicate directly with one another in addition to communicating with the scheduling entity.
  • P2P peer-to-peer
  • mesh network UEs may optionally communicate directly with one another in addition to communicating with the scheduling entity.
  • a scheduling entity and one or more subordinate entities may communicate utilizing the scheduled resources.
  • Fig. 1 is provided merely as an example. Other examples are possible and may differ from what was described with regard to Fig. 1.
  • Fig. 2 shows a block diagram of a design of BS 110 and UE 120, which may be one of the base stations and one of the UEs in Fig. 1.
  • BS 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 BS 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.
  • 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 BS 110.
  • modulators 254a through 254r e.g., for DFT-s-OFDM, CP-OFDM, and/or the like
  • the uplink signals from UE 120 and other UEs may be received by antennas 234, processed by demodulators 232, detected by a MIMO detector 236 if applicable, and further processed by a receive processor 238 to obtain decoded data and control information sent by UE 120.
  • Receive processor 238 may provide the decoded data to a data sink 239 and the decoded control information to controller/processor 240.
  • BS 110 may include communication unit 244 and communicate to network controller 130 via communication unit 244.
  • Network controller 130 may include communication unit 294, controller/processor 290, and memory 292.
  • one or more components of UE 120 may be included in a housing. Controller/processor 240 of BS 110, controller/processor 280 of UE 120, and/or any other component (s) of Fig. 2 may perform one or more techniques associated with fast VoNR to VoLTE fallback, as described in more detail elsewhere herein. For example, controller/processor 240 of BS 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 800 of Fig. 8, process 900 of Fig. 9, and/or other processes as described herein.
  • Memories 242 and 282 may store data and program codes for BS 110 and UE 120, respectively.
  • a scheduler 246 may schedule UEs for data transmission on the downlink and/or uplink.
  • UE 120 may include means for a connection configuration message to establish a guaranteed bit rate (GBR) quality of service (QoS) flow for a call that is undergoing fallback from a 5G/New Radio (NR) base station to a 4G/Long Term Evolution (LTE) base station, means for providing an indication to an upper protocol layer of the UE 120 that establishment of the flow is successful, means for performing the call using a 4G/LTE bearer via the 4G/LTE base station after the fallback to the 4G/LTE base station, means for receiving a handover command with the GBR radio bearer configuration for the GBR QoS flow, wherein the handover command identifies the 4G/LTE bearer and/or the 4G/LTE base station, and/or the like.
  • such means may include one or more components of UE 120 described in connection with Fig. 2.
  • BS 110 may be a 5G/NR base station, and may include means for providing a connection configuration message to establish a guaranteed bit rate (GBR) quality of service (QoS) flow for a call that is undergoing fallback from the 5G/NR base station to a 4G/Long Term Evolution (LTE) base station, means for providing a first handover message to a 5G/NR core network to cause handover of the call to the 4G/LTE base station, wherein the first handover message does not include the GBR radio bearer information for the GBR QoS flow, means for providing a second handover message toward a user equipment associated with the call, wherein the second handover message includes information identifying a 4G/LTE GBR radio bearer for the call, and/or the like.
  • such means may include one or more components of BS 110 described in connection with Fig. 2.
  • Fig. 2 is provided merely as an example. Other examples are possible and may differ from what was described with regard to Fig. 2.
  • Fig. 3 shows an example frame structure 300 for frequency division duplexing (FDD) in a telecommunications system (e.g., LTE) .
  • the transmission timeline for each of the downlink and uplink may be partitioned into units of radio frames.
  • Each radio frame may have a predetermined duration (e.g., 10 milliseconds (ms) ) and may be partitioned into 10 subframes with indices of 0 through 9.
  • Each subframe may include two slots.
  • Each radio frame may thus include 20 slots with indices of 0 through 19.
  • Each slot may include L symbol periods, e.g., seven symbol periods for a normal cyclic prefix (as shown in Fig. 3) or six symbol periods for an extended cyclic prefix.
  • the 2L symbol periods in each subframe may be assigned indices of 0 through 2L–1.
  • a wireless communication structure may refer to a periodic time-bounded communication unit defined by a wireless communication standard and/or protocol.
  • a BS may transmit a primary synchronization signal (PSS) and a secondary synchronization signal (SSS) on the downlink in the center of the system bandwidth for each cell supported by the BS.
  • PSS primary synchronization signal
  • SSS secondary synchronization signal
  • the PSS and SSS may be transmitted in symbol periods 6 and 5, respectively, in subframes 0 and 5 of each radio frame with the normal cyclic prefix, as shown in Fig. 3.
  • the PSS and SSS may be used by UEs for cell search and acquisition.
  • the BS may transmit a cell-specific reference signal (CRS) across the system bandwidth for each cell supported by the BS.
  • CRS cell-specific reference signal
  • the CRS may be transmitted in certain symbol periods of each subframe and may be used by the UEs to perform channel estimation, channel quality measurement, and/or other functions.
  • the BS may also transmit a physical broadcast channel (PBCH) in symbol periods 0 to 3 in slot 1 of certain radio frames.
  • PBCH physical broadcast channel
  • the PBCH may carry some system information.
  • the BS may transmit other system information such as system information blocks (SIBs) on a physical downlink shared channel (PDSCH) in certain subframes.
  • SIBs system information blocks
  • PDSCH physical downlink shared channel
  • the BS may transmit control information/data on a physical downlink control channel (PDCCH) in the first B symbol periods of a subframe, where B may be configurable for each subframe.
  • the BS may transmit traffic data and/or other data on the PDSCH in the remaining symbol periods of each subframe.
  • a Node B may transmit these or other signals in these locations or in different locations of the subframe.
  • Fig. 3 is provided merely as an example. Other examples are possible and may differ from what was described with regard to Fig. 3.
  • Fig. 4 shows two example subframe formats 410 and 420 with the normal cyclic prefix.
  • the available time frequency resources may be partitioned into resource blocks.
  • Each resource block may cover 12 subcarriers in one slot and may include a number of resource elements.
  • Each resource element may cover one subcarrier in one symbol period and may be used to send one modulation symbol, which may be a real or complex value.
  • Subframe format 410 may be used for two antennas.
  • a CRS may be transmitted from antennas 0 and 1 in symbol periods 0, 4, 7, and 11.
  • a reference signal is a signal that is known a priori by a transmitter and a receiver and may also be referred to as a pilot signal.
  • a CRS is a reference signal that is specific for a cell, e.g., generated based at least in part on a cell identity (ID) .
  • ID cell identity
  • Subframe format 420 may be used with four antennas.
  • a CRS may be transmitted from antennas 0 and 1 in symbol periods 0, 4, 7, and 11 and from antennas 2 and 3 in symbol periods 1 and 8.
  • a CRS may be transmitted on evenly spaced subcarriers, which may be determined based at least in part on cell ID.
  • CRSs may be transmitted on the same or different subcarriers, depending on their cell IDs.
  • resource elements not used for the CRS may be used to transmit data (e.g., traffic data, control data, and/or other data) .
  • E-UTRA Evolved Universal Terrestrial Radio Access
  • An interlace structure may be used for each of the downlink and uplink for FDD in certain telecommunications systems (e.g., LTE) .
  • Q interlaces with indices of 0 through Q –1 may be defined, where Q may be equal to 4, 6, 8, 10, or some other value.
  • Each interlace may include subframes that are spaced apart by Q frames.
  • interlace q may include subframes q, q + Q, q + 2Q, and/or the like, where q ⁇ ⁇ 0, ..., Q-1 ⁇ .
  • the wireless network may support hybrid automatic retransmission request (HARQ) for data transmission on the downlink and uplink.
  • HARQ hybrid automatic retransmission request
  • a transmitter e.g., a BS
  • a receiver e.g., a UE
  • all transmissions of the packet may be sent in subframes of a single interlace.
  • each transmission of the packet may be sent in any subframe.
  • a UE may be located within the coverage of multiple BSs. One of these BSs may be selected to serve the UE. The serving BS may be selected based at least in part on various criteria such as received signal strength, received signal quality, path loss, and/or the like. Received signal quality may be quantified by a signal-to-noise-and-interference ratio (SINR) , or a reference signal received quality (RSRQ) , or some other metric.
  • SINR signal-to-noise-and-interference ratio
  • RSRQ reference signal received quality
  • the UE may operate in a dominant interference scenario in which the UE may observe high interference from one or more interfering BSs.
  • aspects of the examples described herein may be associated with LTE technologies, aspects of the present disclosure may be applicable with other wireless communication systems, such as NR or 5G technologies.
  • New radio may refer to radios configured to operate according to a new air interface (e.g., other than Orthogonal Frequency Divisional Multiple Access (OFDMA) -based air interfaces) or fixed transport layer (e.g., other than Internet Protocol (IP) ) .
  • NR may utilize OFDM with a CP (herein referred to as cyclic prefix OFDM or CP-OFDM) and/or SC-FDM on the uplink, may utilize CP-OFDM on the downlink and include support for half-duplex operation using time division duplexing (TDD) .
  • OFDM Orthogonal Frequency Divisional Multiple Access
  • IP Internet Protocol
  • NR may, for example, utilize OFDM with a CP (herein referred to as CP-OFDM) and/or discrete Fourier transform spread orthogonal frequency-division multiplexing (DFT-s-OFDM) on the uplink, may utilize CP-OFDM on the downlink and include support for half-duplex operation using TDD.
  • CP-OFDM OFDM with a CP
  • DFT-s-OFDM discrete Fourier transform spread orthogonal frequency-division multiplexing
  • NR may include Enhanced Mobile Broadband (eMBB) service targeting wide bandwidth (e.g., 80 megahertz (MHz) and beyond) , millimeter wave (mmW) targeting high carrier frequency (e.g., 60 gigahertz (GHz) ) , massive MTC (mMTC) targeting non-backward compatible MTC techniques, and/or mission critical targeting ultra reliable low latency communications (URLLC) service.
  • eMBB Enhanced Mobile Broadband
  • mmW millimeter wave
  • mMTC massive MTC
  • URLLC ultra reliable low latency communications
  • NR resource blocks may span 12 sub-carriers with a sub-carrier bandwidth of 75 kilohertz (kHz) over a 0.1 ms duration.
  • Each radio frame may include 50 subframes with a length of 10 ms. Consequently, each subframe may have a length of 0.2 ms.
  • Each subframe may indicate a link direction (e.g., DL or UL) for data transmission and the link direction for each subframe may be dynamically switched.
  • Each subframe may include downlink/uplink (DL/UL) data as well as DL/UL control data.
  • NR may support a different air interface, other than an OFDM-based interface.
  • NR networks may include entities such central units or distributed units.
  • the RAN may include a central unit (CU) and distributed units (DUs) .
  • the CU may be termed a 5G/NR core network.
  • a NR BS e.g., gNB, 5G/NR Node B, Node B, transmit receive point (TRP) , access point (AP)
  • TRP transmit receive point
  • AP access point
  • NR cells can be configured as access cells (ACells) or data only cells (DCells) .
  • the RAN e.g., a central unit or distributed unit
  • DCells may be cells used for carrier aggregation or dual connectivity, but not used for initial access, cell selection/reselection, or handover.
  • DCells may not transmit synchronization signals. In some cases, DCells may transmit synchronization signals.
  • NR BSs may transmit downlink signals to UEs indicating the cell type. Based at least in part on the cell type indication, the UE may communicate with the NR BS. For example, the UE may determine NR BSs to consider for cell selection, access, handover, and/or measurement based at least in part on the indicated cell type.
  • Fig. 4 is provided merely as an example. Other examples are possible and may differ from what was described with regard to Fig. 4.
  • a 5G access node 506 may include an access node controller (ANC) 502.
  • the ANC may be a central unit (CU) of the distributed RAN 500.
  • the backhaul interface to the next generation core network (NG-CN) 504 may terminate at the ANC.
  • the NG-CN 504 may be termed a 5G/NR core network.
  • the backhaul interface to neighboring next generation access nodes (NG-ANs) may terminate at the ANC.
  • the ANC may include one or more TRPs 508 (which may also be referred to as BSs, NR BSs, Node Bs, 5G NBs, APs, gNB, or some other term) . As described above, a TRP may be used interchangeably with “cell. ”
  • the TRPs 508 may be a distributed unit (DU) .
  • the TRPs may be connected to one ANC (ANC 502) or more than one ANC (not illustrated) .
  • ANC 502 ANC 502
  • RaaS radio as a service
  • a TRP may include one or more antenna ports.
  • the TRPs may be configured to individually (e.g., dynamic selection) or jointly (e.g., joint transmission) serve traffic to a UE.
  • the local architecture of RAN 500 may be used to illustrate fronthaul definition.
  • the architecture may be defined that support fronthauling solutions across different deployment types.
  • the architecture may be based at least in part on transmit network capabilities (e.g., bandwidth, latency, and/or jitter) .
  • the architecture may share features and/or components with LTE.
  • the next generation AN (NG-AN) 510 may support dual connectivity with NR.
  • the NG-AN may share a common fronthaul for LTE and NR.
  • the architecture may enable cooperation between and among TRPs 508. For example, cooperation may be preset within a TRP and/or across TRPs via the ANC 502. According to aspects, no inter-TRP interface may be needed/present.
  • a dynamic configuration of split logical functions may be present within the architecture of RAN 500.
  • the packet data convergence protocol (PDCP) may be adaptably placed at the ANC or TRP.
  • PDCP packet data convergence protocol
  • RLC radio link control
  • MAC media access control
  • a BS may include a central unit (CU) (e.g., ANC 502) and/or one or more distributed units (e.g., one or more TRPs 508) .
  • CU central unit
  • distributed units e.g., one or more TRPs 508 .
  • Fig. 5 is provided merely as an example. Other examples are possible and may differ from what was described with regard to Fig. 5.
  • Fig. 6 illustrates an example physical architecture of a distributed RAN 600, according to aspects of the present disclosure.
  • a centralized core network unit (C-CU) 602 may host core network functions, and may be referred to as a 5G/NR core network.
  • the C-CU may be centrally deployed.
  • C-CU functionality may be offloaded (e.g., to advanced wireless services (AWS) ) , in an effort to handle peak capacity.
  • AWS advanced wireless services
  • a centralized RAN unit (C-RU) 604 may host one or more ANC functions.
  • the C-RU may host core network functions locally, and may additionally or alternatively be referred to as a 5G/NR core network.
  • the C-RU may have distributed deployment.
  • the C-RU may be closer to the network edge.
  • a distributed unit (DU) 606 may host one or more TRPs.
  • the DU may be located at edges of the network with radio frequency (RF) functionality.
  • RF radio frequency
  • Fig. 6 is provided merely as an example. Other examples are possible and may differ from what was described with regard to Fig. 6.
  • a 5G/NR network and a 4G/LTE network may support IP-based calling.
  • An IP-based calling service may be termed VoNR in the 5G/NR network and VoLTE in the 4G/LTE network.
  • VoNR Voice over IP
  • 4G/LTE Long Term Evolution
  • voice calling may primarily be provided by the 4G/LTE network through a procedure which may be termed VoNR to VoLTE fallback.
  • VoNR to VoLTE fallback may be triggered by a guaranteed bit rate (GBR) quality of service (QoS) flow setup request from a 5G/NR core network to a 5G/NR base station during VoNR call setup.
  • the 5G/NR base station may determine that an appropriate QoS or bitrate cannot be provided, and may therefore perform the VoNR to VoLTE fallback.
  • the 5G/NR base station may establish a GBR data radio bearer (DRB) and accept the flow, despite determining that fallback is to be performed.
  • the GBR DRB may require resource reservation and strict admission control, and may require significant time and resources to establish.
  • the 5G/NR base station may hand over the UE to a 4G/LTE base station for performance of the (formerly) VoNR call using VoLTE. This may mean that the time and resources associated with resource reservation and admission control of the 5G/NR base station are wasted.
  • Some techniques and apparatuses described herein provide for VoNR to VoLTE fallback for a GBR QoS flow associated with a call without establishment of a GBR DRB by the 5G/NR core network and/or the 5G/NR base station.
  • a UE may fall back to a 4G/LTE core network and 4G/LTE base station, and the 4G/LTE core network or 4G/LTE base station may provide a radio bearer (e.g., a GBR DRB) for the call via VoLTE.
  • a radio bearer e.g., a GBR DRB
  • Figs. 7A and 7B are call flow diagrams illustrating an example 700 of fast VoNR to VoLTE fallback, in accordance with various aspects of the present disclosure.
  • Figs. 7A and 7B include a UE 705 (e.g., UE 120) , a 5G/NR base station 710 (shown as 5G/NR BS 710, which may include, for example, a 5G/NR BS 110 or a gNB) , a 5G/NR core network 715 (shown as 5G/NR CN 715, and which may include, for example, a C-CU 602 or a C-RU 604) , a 4G/LTE core network 720 (shown as 4G/LTE CN 720, and which may include, for example a mobility management entity (MME) and/or other components of the Evolved Packet Core (EPC) ) , and a 4G/LTE base station 725 (shown as 4G/LTE BS
  • the 5G/NR base station 710 and the 4G/LTE base station 725 may be implemented as part of a single base station.
  • the 4G/LTE base station 725 may be a software, firmware, and/or hardware component of the 5G/NR base station 710 or the 5G/NR base station 710 may be a software, firmware, and/or hardware component of the 4G/LTE base station 725.
  • the 5G/NR base station 710 may receive a GBR QoS flow setup request from the 5G/NR core network 715.
  • the 5G/NR core network 715 may provide the GBR QoS flow setup request to establish a non-access stratum (NAS) flow for a VoNR call with the UE 705.
  • the GBR QoS flow setup request may identify a packet data unit (PDU) session identifier of the flow, a GBR flow identifier for the flow, a session management (SM) non-access stratum (NAS) message, and/or the like.
  • PDU packet data unit
  • SM session management
  • NAS non-access stratum
  • the 5G/NR base station 710 may determine that a fallback from VoNR to VoLTE is to be performed (not shown) .
  • the 5G/NR base station 710 may determine that the fallback is to be performed based at least in part on a QoS of the flow (e.g., based at least in part on determining that the 5G/NR base station 710 cannot support the QoS) , based at least in part on a radio link (e.g., based at least in part on determining that a radio link for the flow does not satisfy a threshold quality level) , and/or the like.
  • a QoS of the flow e.g., based at least in part on determining that the 5G/NR base station 710 cannot support the QoS
  • a radio link e.g., based at least in part on determining that a radio link for the flow does not satisfy a threshold quality level
  • the 5G/NR base station 710 may not perform admission control or establish a DRB (e.g., a GBR DRB) for the flow based at least in part on determining that the fallback is to be performed.
  • Admission control is a procedure for admission or rejection of a new radio bearer, and admission control may use significant resources of the 5G/NR base station 710.
  • the 5G/NR base station 710 conserves radio resources that would otherwise be used to establish then tear down the DRB without using the DRB.
  • the 5G/NR base station 710 may provide a radio resource control (RRC) connection reconfiguration message to the UE 705.
  • RRC radio resource control
  • the RRC connection reconfiguration message may not include DRB configuration information, since the 5G/NR base station 710 did not establish a DRB. Thus, messaging resources are conserved.
  • the RRC connection reconfiguration message may be enclosed in a NAS container, such as the SM NAS message included in the GBR flow setup request.
  • the UE 705 may determine that no GBR has been established based at least in part on the RRC connection reconfiguration message not including the DRB configuration information. Therefore, the UE 705 may determine that a 4G/LTE bearer is to be used for the call. However, the UE 705 may still need to indicate that setup of the flow for the call was successful so that the 5G/NR base station 710 and/or the 5G/NR core network 715 do not end the flow. Therefore, as shown by reference number 745, the UE 705 may provide a RRC connection reconfiguration complete message to the 5G/NR base station 710.
  • the UE 705 may provide, in a NAS message, a GBR flow accept message to the 5G/NR core network 715.
  • the UE 705 causes the 5G/NR base station 710 and/or the 5G/NR core network 715 to continue set-up of the flow despite not establishing a DRB in 5G for the flow.
  • the UE 705 may inform a particular layer of the UE 705 that the flow is established. For example, the UE 705 may inform an upper layer, such as an IP multimedia subsystem (IMS) layer, of the UE 705 that the flow is established. In this way, the UE 705 may prevent the IMS layer from assuming that establishment of the flow was unsuccessful based at least in part on no 5G/NR DRB being established.
  • IMS IP multimedia subsystem
  • the 5G/NR base station 710 may initiate handover by providing a Handover Required message to the 5G/NR core network 715 based at least in part on receiving the RRC connection reconfiguration complete message.
  • the Handover Required message may be encapsulated in an RRC container.
  • the Handover Required message may not include DRB configuration information (since the DRB has yet to be established) . This may cause the 4G/LTE core network 720 to establish and/or map a 4G/LTE bearer for the flow, as described in more detail in connection with Fig. 7B, below.
  • the 5G/NR core network 715 may provide a Forward Relocation Request to the 4G/LTE core network 720.
  • the Forward Relocation Request may include a UE context corresponding to the UE 705.
  • the 4G/LTE core network 720 may provide a handover request to the 4G/LTE base station 725.
  • the handover request may identify an E-UTRAN Radio Access Bearer (E-RAB) for the flow.
  • E-RAB E-UTRAN Radio Access Bearer
  • the 4G/LTE core network 720 may map the E-RAB to the flow.
  • the 4G/LTE core network 720 may add information to the UE context indicating that the flow (and/or the UE 705) is associated with the E-RAB, and may provide the UE context to the 4G/LTE base station 725.
  • the E-RAB may be a GBR DRB, which may provide for a guaranteed bit rate at the cost of increased radio resources.
  • the 4G/LTE base station 725 may provide a handover request acknowledgment (ACK) to the 4G/LTE core network 720.
  • the handover request ACK may include a handover command that is generated by the 4G/LTE base station 725.
  • the 4G/LTE base station 725 may provide the handover command to the 4G/LTE core network 720 for routing to the UE 705 to cause a handover of the UE 705 to the 4G/LTE base station 725.
  • the handover command may identify the 4G/LTE bearer (e.g., the GBR DRB) .
  • the handover command may identify the 4G/LTE bearer.
  • the 4G/LTE core network 720 may provide a forward relocation response to the 5G/NR core network 715.
  • the forward relocation response may include the handover command.
  • the 5G/NR core network 715 may provide the handover command to the 5G/NR base station 710 for forwarding to the UE 705.
  • the 5G/NR base station 710 may provide the handover command to the UE 705.
  • the handover command may identify the 4G/LTE bearer to be used for the call and the flow.
  • the 5G/NR base station 710 may not schedule uplink voice packet transmission before transmission of the handover command to the UE 705. This may prevent uplink data forwarding or packet loss, thereby conserving network resources.
  • the UE 705 may transmit a handover complete message to the 4G/LTE base station 725.
  • the UE 705 may tune to 4G/LTE base station 725 and may transmit the handover complete message when tuning is complete.
  • the UE 705 and the 4G/LTE base station 725 may perform the call using VoLTE.
  • the UE 705 may perform the call on a GBR DRB when a 4G/LTE GBR DRB is provided, and may perform the call on a 4G/LTE default bearer when no 4G/LTE GBR DRB is provided. In this way, establishment of a superfluous 5G/NR DRB during fallback is prevented, which conserves resources of the 5G/NR network and the UE 705.
  • Figs. 7A and 7B are provided as examples. Other examples are possible and may differ from what was described with respect to Figs. 7A and 7B.
  • Fig. 8 is a diagram illustrating an example process 800 performed, for example, by a UE, in accordance with various aspects of the present disclosure.
  • Example process 800 is an example where a UE (e.g., UE 120, 705) performs fast VoNR to VoLTE fallback.
  • a UE e.g., UE 120, 705
  • process 800 may include receiving a connection configuration message to establish a GBR QoS flow for a call that is undergoing fallback from a 5G/NR base station to a 4G/LTE base station, wherein the connection configuration message does not include GBR radio bearer information for the GBR QoS flow (block 810) .
  • the UE may receive a connection configuration message, such as a RRC connection reconfiguration message.
  • the UE may receive the connection configuration message to establish a flow (e.g., a GBR QoS flow) for a call that is associated with a fallback from a 5G/NR base station to a 4G/LTE base station.
  • the call may be undergoing a fallback from VoNR to VoLTE.
  • the connection configuration message may not include GBR radio bearer information for a 5G/NR bearer since no 5G/NR radio bearer is to be set up, thereby conserving 5G/NR network resources and improving latency of the fallback procedure.
  • process 800 may include providing an indication to an upper protocol layer of the UE that establishment of the flow is successful (block 820) .
  • the UE may provide an indication that establishment of the flow is successful without establishment of the 5G/NR bearer, which may cause a 5G/NR core network and/or 5G/NR base station to establish the flow without the 5G/NR bearer.
  • the UE may provide the indication to an upper protocol layer of the UE, or to another network entity (e.g., the 5G/NR core network and/or 5G/NR base station) .
  • process 800 may include performing the call using a 4G/LTE bearer via the 4G/LTE base station after the fallback to the 4G/LTE base station (block 830) .
  • the UE may perform the call using a 4G/LTE bearer established by a 4G/LTE core network and/or the 4G/LTE base station.
  • the UE may perform the call via the 4G/LTE base station.
  • the UE may perform a VoLTE call after the fallback to the 4G/LTE base station.
  • the connection configuration message does not include the GBR bearer information for the QoS flow.
  • the upper protocol layer is an Internet Protocol Multimedia Subsystem layer.
  • the UE may receive a handover command with the GBR radio bearer configuration for the GBR QoS flow, wherein the handover command identifies the 4G/LTE bearer and/or the 4G/LTE base station, and may perform the call based at least in part on the handover command.
  • the 4G/LTE bearer is a GBR-type data radio bearer (DRB) in an access stratum and a GBR-type dedicated Evolved Packet System (EPS) bearer in a non-access stratum.
  • the GBR QoS flow is mapped to a GBR-type dedicated Evolved Packet System (EPS) bearer of the 4G/LTE bearer during a handover associated with the fallback.
  • EPS GBR-type dedicated Evolved Packet System
  • process 800 may include additional blocks, fewer blocks, different blocks, or differently arranged blocks than those depicted in Fig. 8. Additionally, or alternatively, two or more of the blocks of process 800 may be performed in parallel.
  • Fig. 9 is a diagram illustrating an example process 900 performed, for example, by a base station, in accordance with various aspects of the present disclosure.
  • Example process 900 is an example where a 5G/NR base station (e.g., BS 110, 5G/NR base station 710) performs fast VoNR to VoLTE fallback.
  • a 5G/NR base station e.g., BS 110, 5G/NR base station 710 performs fast VoNR to VoLTE fallback.
  • process 900 may include providing a connection configuration message to establish a GBR QoS flow for a call that undergoing a fallback from a 5G/NR base station to a 4G/LTE base station, wherein the connection configuration message does not include GBR radio bearer information for the GBR QoS flow based at least in part on the call undergoing the fallback to the 4G/LTE base station (block 910) .
  • the 5G/NR base station may provide a connection configuration message to establish a flow (e.g., a GBR QoS flow) for a call.
  • the call may be associated with a fallback from a 5G/NR base station to a 4G/LTE base station (e.g., a fallback from VoNR to VoLTE) .
  • the connection configuration message may not include GBR radio bearer information for a GBR bearer based at least in part on the call undergoing the fallback.
  • the 5G/NR base station may not establish the GBR bearer based at least in part on the call being associated with the fallback.
  • process 900 may include providing a first handover message to a 5G/NR core network to cause handover of the call to the 4G/LTE base station, wherein the first handover message does not include the GBR radio bearer information for the GBR QoS flow (block 920) .
  • the 5G/NR base station may provide a first handover message to the 5G/NR core network.
  • the first handover message may cause handover of the call to the 4G/LTE base station.
  • the first handover message may not include the GBR radio bearer information for the GBR QoS flow.
  • process 900 may include providing a second handover message toward a user equipment associated with the call, wherein the second handover message includes information identifying a 4G/LTE GBR radio bearer for the call (block 930) .
  • the 5G/NR base station may provide a second handover message to the UE.
  • the second handover message may include information identifying a 4G/LTE GBR radio bearer for the call.
  • the second handover message may be received from the 4G/LTE base station.
  • the information identifying the 4G/LTE GBR radio bearer is received from at least one of the 4G/LTE base station or a 4G/LTE core network based at least in part on the 4G/LTE base station or the 4G/LTE core network establishing the 4G/LTE GBR radio bearer.
  • the connection configuration message is provided without performing admission control or bearer establishment.
  • the 4G/LTE GBR radio bearer is a GBR-type data radio bearer (DRB) in an access stratum and a GBR-type dedicated Evolved Packet System (EPS) bearer in a non-access stratum.
  • DRB GBR-type data radio bearer
  • EPS Evolved Packet System
  • process 900 may include additional blocks, fewer blocks, different blocks, or differently arranged blocks than those depicted in Fig. 9. Additionally, or alternatively, two or more of the blocks of process 900 may be performed in parallel.
  • the term component is intended to be broadly construed as hardware, firmware, or a combination of hardware and software.
  • a processor is implemented in hardware, firmware, or a combination of hardware and software.
  • satisfying a threshold may 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) .

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Abstract

Certains aspects généraux de la présente invention concernent une communication sans fil. Selon certains aspects, un équipement d'utilisateur peut : recevoir un message de configuration de connexion pour l'établissement d'un flux pour un appel qui est associé à un repli d'une station de base 5G/NR à une station de base 4G/LTE, le message de configuration de connexion ne contenant pas d'informations de support pour un support 5G/NR ; fournir une indication de l'établissement réussi du flux sans établissement du support 5G/NR ; et/ou exécuter l'appel au moyen d'un support 4G/LTE via la station de base 4G/LTE. L'invention présente également de nombreux autres aspects.
PCT/CN2017/104300 2017-09-29 2017-09-29 Techniques et appareils de repli d'appel vocal de 5g/nr à 4g/lte WO2019061265A1 (fr)

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