WO2021203375A1 - Connectivité avec des cellules non autonomes - Google Patents

Connectivité avec des cellules non autonomes Download PDF

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Publication number
WO2021203375A1
WO2021203375A1 PCT/CN2020/084023 CN2020084023W WO2021203375A1 WO 2021203375 A1 WO2021203375 A1 WO 2021203375A1 CN 2020084023 W CN2020084023 W CN 2020084023W WO 2021203375 A1 WO2021203375 A1 WO 2021203375A1
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WO
WIPO (PCT)
Prior art keywords
base station
access technology
radio access
attach
request
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Application number
PCT/CN2020/084023
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English (en)
Inventor
Chaofeng HUI
Fojian ZHANG
Hao Zhang
Quanling ZHANG
Jian Li
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Qualcomm Incorporated
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Publication date
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Priority to PCT/CN2020/084023 priority Critical patent/WO2021203375A1/fr
Publication of WO2021203375A1 publication Critical patent/WO2021203375A1/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
    • H04W60/005—Multiple registrations, e.g. multihoming
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04W—WIRELESS COMMUNICATION NETWORKS
    • H04W76/00—Connection management
    • H04W76/10—Connection setup
    • H04W76/15—Setup of multiple wireless link connections
    • H04W76/16—Involving different core network technologies, e.g. a packet-switched [PS] bearer in combination with a circuit-switched [CS] bearer

Definitions

  • the following relates generally to wireless communications and more specifically to connectivity with non-standalone cells.
  • Wireless communications systems are widely deployed to provide various types of communication content such as voice, video, packet data, messaging, broadcast, and so on. These systems may be capable of supporting communication with multiple users by sharing the available system resources (e.g., time, frequency, and power) .
  • Examples of such multiple-access systems include fourth generation (4G) systems such as Long Term Evolution (LTE) systems, LTE-Advanced (LTE-A) systems, or LTE-A Pro systems, and fifth generation (5G) systems which may be referred to as New Radio (NR) systems.
  • 4G systems such as Long Term Evolution (LTE) systems, LTE-Advanced (LTE-A) systems, or LTE-A Pro systems
  • 5G systems which may be referred to as New Radio (NR) systems.
  • CDMA code division multiple access
  • TDMA time division multiple access
  • FDMA frequency division multiple access
  • OFDMA orthogonal frequency division multiple access
  • DFT-S-OFDM discrete Fourier transform spread orthogonal frequency division multiplexing
  • a wireless multiple-access communications system may include a number of base stations or network access nodes, each simultaneously supporting communication for multiple communication devices, which may be otherwise known as user equipment (UE) .
  • UE user equipment
  • a UE may support communications with a base station using multiple radio access technologies (RATs) , such as 5G, LTE, etc.
  • RATs radio access technologies
  • Improved techniques at a UE for connecting to multiple RATs for communications with a base station may be desirable.
  • a user equipment may support communications with a base station using a first radio access technology (RAT) and a second RAT, and the UE may support efficient techniques for connecting to the second RAT using an attach procedure after failing to connect to the second RAT using a tracking area update (TAU) .
  • the UE may first transmit a TAU to indicate the capability of communications with a base station using the second RAT (e.g., in terms of dual connectivity) .
  • the TAU may trigger a secondary cell group (SCG) addition procedure.
  • SCG secondary cell group
  • the UE may then transmit a service request to establish a connection with the base station for communications using the second RAT.
  • the UE may receive a request to deactivate an Evolved Packet System (EPS) bearer context. If the UE determines that a quantity of requests to deactivate the EPS bearer context satisfies a threshold, the UE may quickly perform the attach procedure to trigger another SCG addition procedure. Using these techniques, the UE may be able to establish a connection with the base station for communications using the second RAT after failing to establish the connection using a TAU request.
  • EPS Evolved Packet System
  • a method of wireless communication at a UE may include performing a first attach procedure to attach to a base station for communications using a first radio access technology, transmitting, to the base station, a tracking area update to indicate support for communicating with the base station using a second radio access technology, determining that a quantity of requests to deactivate a default bearer associated with the first radio access technology satisfies a threshold based on transmitting the tracking area update, and performing a second attach procedure to attach to the base station for communications using the second radio access technology based on determining that the quantity of requests satisfies the threshold.
  • the apparatus may include a processor, memory coupled with the processor, and instructions stored in the memory.
  • the instructions may be executable by the processor to cause the apparatus to perform a first attach procedure to attach to a base station for communications using a first radio access technology, transmit, to the base station, a tracking area update to indicate support for communicating with the base station using a second radio access technology, determine that a quantity of requests to deactivate a default bearer associated with the first radio access technology satisfies a threshold based on transmitting the tracking area update, and perform a second attach procedure to attach to the base station for communications using the second radio access technology based on determining that the quantity of requests satisfies the threshold.
  • the apparatus may include means for performing a first attach procedure to attach to a base station for communications using a first radio access technology, transmitting, to the base station, a tracking area update to indicate support for communicating with the base station using a second radio access technology, determining that a quantity of requests to deactivate a default bearer associated with the first radio access technology satisfies a threshold based on transmitting the tracking area update, and performing a second attach procedure to attach to the base station for communications using the second radio access technology based on determining that the quantity of requests satisfies the threshold.
  • a non-transitory computer-readable medium storing code for wireless communication at a UE is described.
  • the code may include instructions executable by a processor to perform a first attach procedure to attach to a base station for communications using a first radio access technology, transmit, to the base station, a tracking area update to indicate support for communicating with the base station using a second radio access technology, determine that a quantity of requests to deactivate a default bearer associated with the first radio access technology satisfies a threshold based on transmitting the tracking area update, and perform a second attach procedure to attach to the base station for communications using the second radio access technology based on determining that the quantity of requests satisfies the threshold.
  • Some examples of the method, apparatuses, and non-transitory computer-readable medium described herein may further include operations, features, means, or instructions for receiving at least one request to deactivate the default bearer for communications with the base station based on the transmitting, where determining that the quantity of requests satisfies the threshold may be based on receiving the at least one request.
  • Some examples of the method, apparatuses, and non-transitory computer-readable medium described herein may further include operations, features, means, or instructions for incrementing a counter after receiving each request to deactivate the default bearer for communications with the base station, where determining that the quantity of requests satisfies the threshold may be based on incrementing the counter.
  • Some examples of the method, apparatuses, and non-transitory computer-readable medium described herein may further include operations, features, means, or instructions for reactivating the default bearer and transmitting service requests to connect to the base station using the second radio access technology until a value of the counter satisfies the threshold.
  • performing the second attach procedure may include operations, features, means, or instructions for transmitting an attach request to the base station to attach to the base station for communications using the first radio access technology and the second radio access technology, and receiving an attach accept message from the base station based on transmitting the attach request.
  • Some examples of the method, apparatuses, and non-transitory computer-readable medium described herein may further include operations, features, means, or instructions for transmitting a detach request to the base station to detach from the base station prior to performing the second attach procedure, and receiving a detach accept message from the base station based on transmitting the detach request, where transmitting the attach request may be based on receiving the detach accept message.
  • Some examples of the method, apparatuses, and non-transitory computer-readable medium described herein may further include operations, features, means, or instructions for transmitting a service request to the base station to set up a dedicated radio bearer for communicating with the base station using the second radio access technology, receiving a radio resource control reconfiguration message indicating a secondary cell group associated with the second radio access technology, transmitting a radio resource control reconfiguration complete message to the base station, and communicating with cells in the secondary cell group associated with the second radio access technology using the dedicated radio bearer.
  • the first radio access technology includes Long-Term Evolution (LTE) and the second radio access technology includes fifth generation (5G) .
  • FIG. 1 illustrates an example of a wireless communications system that supports connectivity with non-standalone cells in accordance with aspects of the present disclosure.
  • FIG. 2 illustrates an example of a wireless communications system that supports connectivity with non-standalone cells in accordance with aspects of the present disclosure.
  • FIG. 3 illustrates an example of a process flow that supports connectivity with non-standalone cells in accordance with aspects of the present disclosure.
  • FIGs. 4 and 5 show block diagrams of devices that support connectivity with non-standalone cells in accordance with aspects of the present disclosure.
  • FIG. 6 shows a block diagram of a communications manager that supports connectivity with non-standalone cells in accordance with aspects of the present disclosure.
  • FIG. 7 shows a diagram of a system including a device that supports connectivity with non-standalone cells in accordance with aspects of the present disclosure.
  • FIG. 8 shows a flowchart illustrating methods that support connectivity with non-standalone cells in accordance with aspects of the present disclosure.
  • a user equipment may support communications with a base station using multiple radio access technologies (RATs) .
  • RATs radio access technologies
  • LTE Long-Term Evolution
  • 5G Fifth Generation
  • cells at a base station supporting 5G may be non-standalone cells, where non-standalone cells may be cells that depend on the control plane of other cells for control functions.
  • a UE may be anchored on an LTE cell (e.g., LTE may be used for control plane signaling) , and the UE may exchange data with a 5G cell (e.g., 5G may be used for user plane signaling) .
  • LTE Long-Term Evolution
  • 5G Fifth Generation
  • the UE may transmit a tracking area update (TAU) with a dual connectivity flag enabled to the base station followed by a service request to set up a dedicated radio bearer (DRB) (e.g., after a user selects the option of using 5G on the UE) .
  • TAU tracking area update
  • DRB dedicated radio bearer
  • the base station may transmit a request for the UE to deactivate a default Evolved Packet System (EPS) bearer context for internet services.
  • EPS Evolved Packet System
  • the UE may fail to enable 5G services, and the UE may be unable to exchange data with the base station (e.g., resulting in a degraded user experience) .
  • EPS Evolved Packet System
  • a UE may support efficient techniques for connecting to 5G using an attach procedure after failing to connect to 5G using a TAU.
  • a UE may first transmit a TAU to trigger a secondary cell group (SCG) addition procedure for communications with a base station using a radio access technology, such as 5G.
  • the UE may then transmit a service request to request the establishment of a connection with the base station using the radio access technology (e.g., 5G) .
  • the UE may receive a request to deactivate a EPS bearer context.
  • the UE may then continue to transmit service requests and receive requests to deactivate a EPS bearer context up to a threshold number of times.
  • the UE may perform the attach procedure to trigger another SCG addition procedure to enable communications with the base station using the radio access technology (e.g., 5G) .
  • the UE may be able to establish a connection with the base station for communications using the second RAT after failing to establish the connection using a TAU request.
  • FIG. 1 illustrates an example of a wireless communications system 100 that supports connectivity with non-standalone cells in accordance with aspects of the present disclosure.
  • the wireless communications system 100 may include one or more base stations 105, one or more UEs 115, and a core network 130.
  • the wireless communications system 100 may include a Long-Term Evolution (LTE) network, an LTE-Advanced (LTE-A) network, an LTE-A Pro network, an Evolved Universal Mobile Telecommunications System (UMTS) Terrestrial Radio Access Network (E-UTRAN) , or a New Radio (NR) network.
  • LTE Long-Term Evolution
  • LTE-A LTE-Advanced
  • LTE-A Pro LTE-A Pro
  • E-UTRAN Evolved Universal Mobile Telecommunications System
  • NR New Radio
  • the wireless communications system 100 may support enhanced broadband communications, ultra-reliable (e.g., mission critical) communications, low latency communications, communications with low-cost and
  • the base stations 105 may be dispersed throughout a geographic area to form the wireless communications system 100 and may be devices in different forms or having different capabilities.
  • the base stations 105 and the UEs 115 may wirelessly communicate via one or more communication links 125.
  • Each base station 105 may provide a coverage area 110 over which the UEs 115 and the base station 105 may establish one or more communication links 125.
  • the coverage area 110 may be an example of a geographic area over which a base station 105 and a UE 115 may support the communication of signals according to one or more radio access technologies.
  • the UEs 115 may be dispersed throughout a coverage area 110 of the wireless communications system 100, and each UE 115 may be stationary, or mobile, or both at different times.
  • the UEs 115 may be devices in different forms or having different capabilities. Some example UEs 115 are illustrated in FIG. 1.
  • the UEs 115 described herein may be able to communicate with various types of devices, such as other UEs 115, the base stations 105, or network equipment (e.g., core network nodes, relay devices, integrated access and backhaul (IAB) nodes, or other network equipment) , as shown in FIG. 1.
  • network equipment e.g., core network nodes, relay devices, integrated access and backhaul (IAB) nodes, or other network equipment
  • the base stations 105 may communicate with the core network 130, or with one another, or both.
  • the base stations 105 may interface with the core network 130 through one or more backhaul links 120 (e.g., via an S1, N2, N3, or other interface) .
  • the base stations 105 may communicate with one another over the backhaul links 120 (e.g., via an X2, Xn, or other interface) either directly (e.g., directly between base stations 105) , or indirectly (e.g., via core network 130) , or both.
  • the backhaul links 120 may be or include one or more wireless links.
  • One or more of the base stations 105 described herein may include or may be referred to by a person having ordinary skill in the art as a base transceiver station, a radio base station, an access point, a radio transceiver, a NodeB, an eNodeB (eNB) , a next-generation NodeB or a giga-NodeB (either of which may be referred to as a gNB) , a Home NodeB, a Home eNodeB, or other suitable terminology.
  • a base transceiver station a radio base station
  • an access point a radio transceiver
  • a NodeB an eNodeB (eNB)
  • eNB eNodeB
  • a next-generation NodeB or a giga-NodeB either of which may be referred to as a gNB
  • gNB giga-NodeB
  • a UE 115 may include or may be referred to as a mobile device, a wireless device, a remote device, a handheld device, or a subscriber device, or some other suitable terminology, where the “device” may also be referred to as a unit, a station, a terminal, or a client, among other examples.
  • a UE 115 may also include or may be referred to as a personal electronic device such as a cellular phone, a personal digital assistant (PDA) , a tablet computer, a laptop computer, or a personal computer.
  • PDA personal digital assistant
  • a UE 115 may include or be referred to as a wireless local loop (WLL) station, an Internet of Things (IoT) device, an Internet of Everything (IoE) device, or a machine type communications (MTC) device, among other examples, which may be implemented in various objects such as appliances, or vehicles, meters, among other examples.
  • WLL wireless local loop
  • IoT Internet of Things
  • IoE Internet of Everything
  • MTC machine type communications
  • the UEs 115 described herein may be able to communicate with various types of devices, such as other UEs 115 that may sometimes act as relays as well as the base stations 105 and the network equipment including macro eNBs or gNBs, small cell eNBs or gNBs, or relay base stations, among other examples, as shown in FIG. 1.
  • devices such as other UEs 115 that may sometimes act as relays as well as the base stations 105 and the network equipment including macro eNBs or gNBs, small cell eNBs or gNBs, or relay base stations, among other examples, as shown in FIG. 1.
  • the UEs 115 and the base stations 105 may wirelessly communicate with one another via one or more communication links 125 over one or more carriers.
  • the term “carrier” may refer to a set of radio frequency spectrum resources having a defined physical layer structure for supporting the communication links 125.
  • a carrier used for a communication link 125 may include a portion of a radio frequency spectrum band (e.g., a bandwidth part (BWP) ) that is operated according to one or more physical layer channels for a given radio access technology (e.g., LTE, LTE-A, LTE-A Pro, NR) .
  • BWP bandwidth part
  • Each physical layer channel may carry acquisition signaling (e.g., synchronization signals, system information) , control signaling that coordinates operation for the carrier, user data, or other signaling.
  • the wireless communications system 100 may support communication with a UE 115 using carrier aggregation or multi-carrier operation.
  • a UE 115 may be configured with multiple downlink component carriers and one or more uplink component carriers according to a carrier aggregation configuration.
  • Carrier aggregation may be used with both frequency division duplexing (FDD) and time division duplexing (TDD) component carriers.
  • FDD frequency division duplexing
  • TDD time division duplexing
  • Signal waveforms transmitted over a carrier may be made up of multiple subcarriers (e.g., using multi-carrier modulation (MCM) techniques such as orthogonal frequency division multiplexing (OFDM) or discrete Fourier transform spread OFDM (DFT-S-OFDM) ) .
  • MCM multi-carrier modulation
  • OFDM orthogonal frequency division multiplexing
  • DFT-S-OFDM discrete Fourier transform spread OFDM
  • a resource element may consist of one symbol period (e.g., a duration of one modulation symbol) and one subcarrier, where the symbol period and subcarrier spacing are inversely related.
  • the number of bits carried by each resource element may depend on the modulation scheme (e.g., the order of the modulation scheme, the coding rate of the modulation scheme, or both) .
  • a wireless communications resource may refer to a combination of a radio frequency spectrum resource, a time resource, and a spatial resource (e.g., spatial layers or beams) , and the use of multiple spatial layers may further increase the data rate or data integrity for communications with a UE 115.
  • Time intervals of a communications resource may be organized according to radio frames each having a specified duration (e.g., 10 milliseconds (ms) ) .
  • Each radio frame may be identified by a system frame number (SFN) (e.g., ranging from 0 to 1023) .
  • SFN system frame number
  • Each frame may include multiple consecutively numbered subframes or slots, and each subframe or slot may have the same duration.
  • a frame may be divided (e.g., in the time domain) into subframes, and each subframe may be further divided into a number of slots.
  • each frame may include a variable number of slots, and the number of slots may depend on subcarrier spacing.
  • Each slot may include a number of symbol periods (e.g., depending on the length of the cyclic prefix prepended to each symbol period) .
  • a slot may further be divided into multiple mini-slots containing one or more symbols. Excluding the cyclic prefix, each symbol period may contain one or more (e.g., N f ) sampling periods. The duration of a symbol period may depend on the subcarrier spacing or frequency band of operation.
  • a subframe, a slot, a mini-slot, or a symbol may be the smallest scheduling unit (e.g., in the time domain) of the wireless communications system 100 and may be referred to as a transmission time interval (TTI) .
  • TTI duration e.g., the number of symbol periods in a TTI
  • the smallest scheduling unit of the wireless communications system 100 may be dynamically selected (e.g., in bursts of shortened TTIs (sTTIs) ) .
  • Physical channels may be multiplexed on a carrier according to various techniques.
  • a physical control channel and a physical data channel may be multiplexed on a downlink carrier, for example, using one or more of time division multiplexing (TDM) techniques, frequency division multiplexing (FDM) techniques, or hybrid TDM-FDM techniques.
  • a control region e.g., a control resource set (CORESET)
  • CORESET control resource set
  • a control region for a physical control channel may be defined by a number of symbol periods and may extend across the system bandwidth or a subset of the system bandwidth of the carrier.
  • One or more control regions (e.g., CORESETs) may be configured for a set of the UEs 115.
  • one or more of the UEs 115 may monitor or search control regions for control information according to one or more search space sets, and each search space set may include one or multiple control channel candidates in one or more aggregation levels arranged in a cascaded manner.
  • An aggregation level for a control channel candidate may refer to a number of control channel resources (e.g., control channel elements (CCEs) ) associated with encoded information for a control information format having a given payload size.
  • Search space sets may include common search space sets configured for sending control information to multiple UEs 115 and UE-specific search space sets for sending control information to a specific UE 115.
  • Each base station 105 may provide communication coverage via one or more cells, for example a macro cell, a small cell, a hot spot, or other types of cells, or any combination thereof.
  • the term “cell” may refer to a logical communication entity used for communication with a base station 105 (e.g., over a carrier) and may be associated with an identifier for distinguishing neighboring cells (e.g., a physical cell identifier (PCID) , a virtual cell identifier (VCID) , or others) .
  • a cell may also refer to a geographic coverage area 110 or a portion of a geographic coverage area 110 (e.g., a sector) over which the logical communication entity operates.
  • Such cells may range from smaller areas (e.g., a structure, a subset of structure) to larger areas depending on various factors such as the capabilities of the base station 105.
  • a cell may be or include a building, a subset of a building, or exterior spaces between or overlapping with geographic coverage areas 110, among other examples.
  • a macro cell generally covers a relatively large geographic area (e.g., several kilometers in radius) and may allow unrestricted access by the UEs 115 with service subscriptions with the network provider supporting the macro cell.
  • a small cell may be associated with a lower-powered base station 105, as compared with a macro cell, and a small cell may operate in the same or different (e.g., licensed, unlicensed) frequency bands as macro cells.
  • Small cells may provide unrestricted access to the UEs 115 with service subscriptions with the network provider or may provide restricted access to the UEs 115 having an association with the small cell (e.g., the UEs 115 in a closed subscriber group (CSG) , the UEs 115 associated with users in a home or office) .
  • a base station 105 may support one or multiple cells and may also support communications over the one or more cells using one or multiple component carriers.
  • a carrier may support multiple cells, and different cells may be configured according to different protocol types (e.g., MTC, narrowband IoT (NB-IoT) , enhanced mobile broadband (eMBB) ) that may provide access for different types of devices.
  • protocol types e.g., MTC, narrowband IoT (NB-IoT) , enhanced mobile broadband (eMBB)
  • NB-IoT narrowband IoT
  • eMBB enhanced mobile broadband
  • a base station 105 may be movable and therefore provide communication coverage for a moving geographic coverage area 110.
  • different geographic coverage areas 110 associated with different technologies may overlap, but the different geographic coverage areas 110 may be supported by the same base station 105.
  • the overlapping geographic coverage areas 110 associated with different technologies may be supported by different base stations 105.
  • the wireless communications system 100 may include, for example, a heterogeneous network in which different types of the base stations 105 provide coverage for various geographic coverage areas 110 using the same or different RATs.
  • the wireless communications system 100 may be configured to support ultra-reliable communications or low-latency communications, or various combinations thereof.
  • the wireless communications system 100 may be configured to support ultra-reliable low-latency communications (URLLC) or mission critical communications.
  • the UEs 115 may be designed to support ultra-reliable, low-latency, or critical functions (e.g., mission critical functions) .
  • Ultra-reliable communications may include private communication or group communication and may be supported by one or more mission critical services such as mission critical push-to-talk (MCPTT) , mission critical video (MCVideo) , or mission critical data (MCData) .
  • MCPTT mission critical push-to-talk
  • MCVideo mission critical video
  • MCData mission critical data
  • Support for mission critical functions may include prioritization of services, and mission critical services may be used for public safety or general commercial applications.
  • the terms ultra-reliable, low-latency, mission critical, and ultra-reliable low-latency may be used interchangeably herein.
  • a UE 115 may also be able to communicate directly with other UEs 115 over a device-to-device (D2D) communication link 135 (e.g., using a peer-to-peer (P2P) or D2D protocol) .
  • D2D device-to-device
  • P2P peer-to-peer
  • One or more UEs 115 utilizing D2D communications may be within the geographic coverage area 110 of a base station 105.
  • Other UEs 115 in such a group may be outside the geographic coverage area 110 of a base station 105 or be otherwise unable to receive transmissions from a base station 105.
  • groups of the UEs 115 communicating via D2D communications may utilize a one-to-many (1: M) system in which each UE 115 transmits to every other UE 115 in the group.
  • a base station 105 facilitates the scheduling of resources for D2D communications. In other cases, D2D communications are carried out between the UEs 115 without the involvement of a base station 105.
  • the core network 130 may provide user authentication, access authorization, tracking, Internet Protocol (IP) connectivity, and other access, routing, or mobility functions.
  • the core network 130 may be an evolved packet core (EPC) or 5G core (5GC) , which may include at least one control plane entity that manages access and mobility (e.g., a mobility management entity (MME) , an access and mobility management function (AMF) ) and at least one user plane entity that routes packets or interconnects to external networks (e.g., a serving gateway (S-GW) , a Packet Data Network (PDN) gateway (P-GW) , or a user plane function (UPF) ) .
  • EPC evolved packet core
  • 5GC 5G core
  • MME mobility management entity
  • AMF access and mobility management function
  • S-GW serving gateway
  • PDN Packet Data Network gateway
  • UPF user plane function
  • the control plane entity may manage non-access stratum (NAS) functions such as mobility, authentication, and bearer management for the UEs 115 served by the base stations 105 associated with the core network 130.
  • NAS non-access stratum
  • User IP packets may be transferred through the user plane entity, which may provide IP address allocation as well as other functions.
  • the user plane entity may be connected to the network operators IP services 150.
  • the operators IP services 150 may include access to the Internet, Intranet (s) , an IP Multimedia Subsystem (IMS) , or a Packet-Switched Streaming Service.
  • Some of the network devices may include subcomponents such as an access network entity 140, which may be an example of an access node controller (ANC) .
  • Each access network entity 140 may communicate with the UEs 115 through one or more other access network transmission entities 145, which may be referred to as radio heads, smart radio heads, or transmission/reception points (TRPs) .
  • Each access network transmission entity 145 may include one or more antenna panels.
  • various functions of each access network entity 140 or base station 105 may be distributed across various network devices (e.g., radio heads and ANCs) or consolidated into a single network device (e.g., a base station 105) .
  • the wireless communications system 100 may operate using one or more frequency bands, typically in the range of 300 megahertz (MHz) to 300 gigahertz (GHz) .
  • the region from 300 MHz to 3 GHz is known as the ultra-high frequency (UHF) region or decimeter band because the wavelengths range from approximately one decimeter to one meter in length.
  • UHF waves may be blocked or redirected by buildings and environmental features, but the waves may penetrate structures sufficiently for a macro cell to provide service to the UEs 115 located indoors.
  • the transmission of UHF waves may be associated with smaller antennas and shorter ranges (e.g., less than 100 kilometers) compared to transmission using the smaller frequencies and longer waves of the high frequency (HF) or very high frequency (VHF) portion of the spectrum below 300 MHz.
  • HF high frequency
  • VHF very high frequency
  • the wireless communications system 100 may utilize both licensed and unlicensed radio frequency spectrum bands.
  • the wireless communications system 100 may employ License Assisted Access (LAA) , LTE-Unlicensed (LTE-U) radio access technology, or NR technology in an unlicensed band such as the 5 GHz industrial, scientific, and medical (ISM) band.
  • LAA License Assisted Access
  • LTE-U LTE-Unlicensed
  • NR NR technology
  • an unlicensed band such as the 5 GHz industrial, scientific, and medical (ISM) band.
  • devices such as the base stations 105 and the UEs 115 may employ carrier sensing for collision detection and avoidance.
  • operations in unlicensed bands may be based on a carrier aggregation configuration in conjunction with component carriers operating in a licensed band (e.g., LAA) .
  • Operations in unlicensed spectrum may include downlink transmissions, uplink transmissions, P2P transmissions, or D2D transmissions, among other examples.
  • a base station 105 or a UE 115 may be equipped with multiple antennas, which may be used to employ techniques such as transmit diversity, receive diversity, multiple-input multiple-output (MIMO) communications, or beamforming.
  • the antennas of a base station 105 or a UE 115 may be located within one or more antenna arrays or antenna panels, which may support MIMO operations or transmit or receive beamforming.
  • one or more base station antennas or antenna arrays may be co-located at an antenna assembly, such as an antenna tower.
  • antennas or antenna arrays associated with a base station 105 may be located in diverse geographic locations.
  • a base station 105 may have an antenna array with a number of rows and columns of antenna ports that the base station 105 may use to support beamforming of communications with a UE 115.
  • a UE 115 may have one or more antenna arrays that may support various MIMO or beamforming operations.
  • an antenna panel may support radio frequency beamforming for a signal transmitted via an antenna port.
  • Beamforming which may also be referred to as spatial filtering, directional transmission, or directional reception, is a signal processing technique that may be used at a transmitting device or a receiving device (e.g., a base station 105, a UE 115) to shape or steer an antenna beam (e.g., a transmit beam, a receive beam) along a spatial path between the transmitting device and the receiving device.
  • Beamforming may be achieved by combining the signals communicated via antenna elements of an antenna array such that some signals propagating at particular orientations with respect to an antenna array experience constructive interference while others experience destructive interference.
  • the adjustment of signals communicated via the antenna elements may include a transmitting device or a receiving device applying amplitude offsets, phase offsets, or both to signals carried via the antenna elements associated with the device.
  • the adjustments associated with each of the antenna elements may be defined by a beamforming weight set associated with a particular orientation (e.g., with respect to the antenna array of the transmitting device or receiving device, or with respect to some other orientation) .
  • the wireless communications system 100 may be a packet-based network that operates according to a layered protocol stack.
  • communications at the bearer or Packet Data Convergence Protocol (PDCP) layer may be IP-based.
  • a Radio Link Control (RLC) layer may perform packet segmentation and reassembly to communicate over logical channels.
  • RLC Radio Link Control
  • a Medium Access Control (MAC) layer may perform priority handling and multiplexing of logical channels into transport channels.
  • the MAC layer may also use error detection techniques, error correction techniques, or both to support retransmissions at the MAC layer to improve link efficiency.
  • the Radio Resource Control (RRC) protocol layer may provide establishment, configuration, and maintenance of an RRC connection between a UE 115 and a base station 105 or a core network 130 supporting radio bearers for user plane data.
  • RRC Radio Resource Control
  • transport channels may be mapped to physical channels.
  • UEs 115 in wireless communications system 100 may support communications with base stations 105 using multiple RATs (e.g., LTE, 5G, etc. ) .
  • 5G cells at a base station 105 may be non-standalone cells, where non-standalone cells may be cells that depend on the control plane of other cells for control functions.
  • a UE 115 may be anchored on an LTE cell (e.g., LTE may be used for control plane signaling) , and the UE 115 may exchange data with a 5G cell (e.g., 5G may be used for user plane signaling) .
  • LTE Long Term Evolution
  • 5G may be used for user plane signaling
  • a user of the UE 115 may enable 5G from the user interface (UI) or may perform a default data subscription (DDS) switch to transfer 5G capability from one subscription to another.
  • the UE 115 may transmit a TAU with a dual connectivity (e.g., E-UTRAN NR dual connectivity (ENDC) ) flag enabled to the base station 105 to connect to the base station 105 for 5G services.
  • a dual connectivity e.g., E-UTRAN NR dual connectivity (ENDC)
  • E-UTRAN NR dual connectivity (ENDC) e.g., E-UTRAN NR dual connectivity (ENDC)
  • the base station 105 may transmit a request for the UE 115 to deactivate an EPS bearer context.
  • users may experience difficulty connecting with the base station 105 for 5G services due to the network deactivating the EPS bearer.
  • a user of the UE 115 may first enable 5G capability (e.g., for a DDS) .
  • the UE 115 may then send a TAU to enable ENDC and synchronize the additional capability (i.e., 5G capability) with the network.
  • the UE 115 may send a service request to set up a DRB for communicating using 5G, the network may configure a SCG (e.g., including 5G cells) via an RRC reconfiguration message, and the UE 115 may respond with an RRC reconfiguration complete message.
  • the network may then send a deactivate EPS bearer context request to the UE 115, and the UE 115 may release the DRB.
  • a modem at the UE 115 may then send a data call failure indication to an up-layer.
  • the up-layer may try to set up a data call again after 10 seconds, and, after failing to set up the data call, the UE 115 may set up a new internet EPS bearer.
  • the UE 115 may then repeat the operations of sending the service request, deactivating the EPS bearer, and setting up the EPS bearer again. That is, the operations may be repeated and the user may not be able to connect to the internet via LTE or NR 5G, resulting in a degraded user experience.
  • UEs 115 in wireless communications system 100 may support efficient techniques for connecting to 5G using an attach procedure to trigger an SCG addition procedure after failing to connect to 5G using a TAU to trigger an SCG addition procedure.
  • FIG. 2 illustrates an example of a wireless communications system 200 that supports connectivity with non-standalone cells in accordance with aspects of the present disclosure.
  • the wireless communications system 200 includes a UE 115-a, which may be an example of a UE 115 described with reference to FIG. 1.
  • the wireless communications system 200 also includes a base station 105-a, which may be an example of a base station 105 described with reference to FIG. 1.
  • the base station 105-a may provide communication coverage for a coverage area 110-a.
  • the wireless communications system 200 may implement aspects of wireless communications system 100.
  • the UE 115-a in wireless communications system 200 may support efficient techniques for connecting to a radio access technology (e.g., 5G) using an attach procedure to trigger an SCG addition procedure after failing to connect to the radio access technology (e.g., 5G) using a TAU to trigger an SCG addition procedure.
  • the wireless communication system 200 may support communication between a base station 105-a and a UE 115-a over two RATs (e.g., LTE and 5G) , where one of the radio access technologies is implemented using a non-standalone cell (e.g., 5G) .
  • a UE 115-a may have an established communication link with the base station 105-a using a first RAT (e.g., LTE) .
  • the UE 115-a may transmit a TAU 205 to the base station 105-a to enable dual connectivity for communications using a second RAT (e.g., 5G) .
  • the UE 115-a may then transmit a service request to the base station 105-a to request the establishment of a connection for communications using the second RAT (e.g., 5G) .
  • the UE 115-a may receive a request 210 to deactivate an EPS bearer associated with the first radio access technology.
  • the UE 115-a may then continue to transmit service requests and receive requests to deactivate an EPS bearer context up to a threshold number of times. After determining that a quantity of requests to deactivate the EPS bearer context satisfies a threshold, the UE 115-a may perform the attach procedure to trigger an SCG addition procedure to enable communications with the base station using the second radio access technology (e.g., 5G) . Specifically, the TAU request may be changed to an attach request for a UE radio capability information update or changed to a detach and attach procedure after a preconfigured maximum retry count.
  • the second radio access technology e.g., 5G
  • the UE 115-a may detach from the network and trigger an attach request to enable dual connectivity. For example, the UE 115-a may transmit an attach request 215 to enable dual connectivity for communications using the base station 105-a using 5G.
  • the threshold e.g., a maximum retry count is reached
  • FIG. 3 illustrates an example of a process flow 300 that supports connectivity with non-standalone cells in accordance with aspects of the present disclosure.
  • Process flow 300 illustrates aspects of techniques performed at a non-access stratum (NAS) layer of a UE 305.
  • the UE 305 may be an example of a UE 115 described with reference to FIGs. 1 and 2 and may be an NR capable UE operating in a non-standalone mode.
  • Process flow 300 also illustrates aspects of techniques performed by a base station 105 in a non-standalone network 310 (e.g., non-standalone 5G network with LTE anchor cells) .
  • the base station 105 may be an example of a base station 105 described with reference to FIGs.
  • the UE 305 in process flow 300 may support communications with the network 310 using a first RAT and a second RAT, and the UE 305 may use a detach and attach procedure to trigger an SCG addition procedure to connect to the second RAT after failing to connect to the second RAT (e.g., by triggering an SCG procedure using a TAU) .
  • the UE 305 may perform an attach procedure to attach to the network 310 for communications using the first RAT. For instance, the UE 305 may transmit an attach request to the network 310 and may receive an attach accept message from the network 310. In some cases, a user may then opt to use a second RAT for exchanging data with the network 310. Thus, at 315, the UE 305 may transmit a TAU request to the network 310 to enable dual connectivity with the first RAT and the second RAT (e.g., ENDC) . That is, the UE 305 may transmit the TAU to enable communications between the UE 305 and the network 310 using the first RAT and the second RAT. At 320, the UE 305 may receive a TAU accept message from the network 310.
  • the first RAT and the second RAT e.g., ENDC
  • the UE 305 may then perform a first procedure to establish a connection with the network 310 for communications using the second RAT.
  • the TAU may trigger an SCG addition procedure to enable communications between the UE 305 and the network 310 using the second RAT.
  • the UE 305 may transmit a service request to the network 310.
  • the UE 305 may receive a radio resource control (RRC) reconfiguration message with SCG addition from the network 310. That is, the RRC reconfiguration message may indicate a group of cells supporting communications using the second RAT, and the UE may add these cells to an SCG for communications with the network 310 using the second RAT.
  • the UE 305 may transmit an RRC reconfiguration complete message to the network 310.
  • RRC radio resource control
  • the UE 305 may then receive a deactivate EPS bearer context request from the network 310 indicating that the UE 305 is to deactivate a default EPS bearer.
  • the UE 305 may transmit a deactivate EPS bearer context accept message to the network 310, and the UE 305 may deactivate the default EPS bearer.
  • the UE 305 may determine whether a quantity of requests to deactivate a default EPS bearer associated with the first RAT satisfies a threshold (e.g., 3) .
  • the UE 305 may increment a counter after receiving each request to deactivate the EPS bearer for communications with the network 310, and, after incrementing the counter based on receiving the request at 340, the UE 305 may determine whether the counter has reached a maximum value.
  • the UE 305 may transmit a packet data network (PDN) connectivity request to the network 310, and, at 360, the UE 305 may activate the default EPS bearer.
  • the UE 305 may then loop through the first procedure by first transmitting another service request to the network 310 (e.g., at 325) .
  • PDN packet data network
  • the UE 305 may use an attach procedure described herein to enable dual connectivity with the first RAT and the second RAT (e.g., ENDC) .
  • the attach procedure may trigger an SCG addition procedure to enable communications between the UE 305 and the network 310 using the second RAT.
  • the UE 305 may transmit a detach request to the network 310, and, at 375, the UE 305 may receive a detach accept message from the network 310. That is, the UE 305 may detach from original attachment to the network 310 for communications using the first RAT.
  • the UE 305 may then perform an attach procedure to attach to the network 310 for communications using the first RAT and the second RAT.
  • the UE 305 may transmit an attach request to the network 310 to enable dual connectivity, and, at 385, the UE 305 may receive an attach accept message from the network 310.
  • the UE 305 may then transmit a service request to the network 310, receive an RRC reconfiguration message from the network 310 with SCG addition, and transmit an RRC reconfiguration complete message to the network 310.
  • the UE 305 may trigger the SCG addition procedure and connect to the network 310 for communications using the second RAT.
  • FIG. 4 shows a block diagram 400 of a device 405 that supports connectivity with non-standalone cells in accordance with aspects of the present disclosure.
  • the device 405 may be an example of aspects of a UE 115 as described herein.
  • the device 405 may include a receiver 410, a communications manager 415, and a transmitter 420.
  • the device 405 may also include a processor. Each of these components may be in communication with one another (e.g., via one or more buses) .
  • the receiver 410 may receive information such as packets, user data, or control information associated with various information channels (e.g., control channels, data channels, and information related to connectivity with non-standalone cells, etc. ) . Information may be passed on to other components of the device 405.
  • the receiver 410 may be an example of aspects of the transceiver 720 described with reference to FIG. 7.
  • the receiver 410 may utilize a single antenna or a set of antennas.
  • the communications manager 415 may perform a first attach procedure to attach to a base station for communications using a first radio access technology, transmit, to the base station, a tracking area update to indicate support for communicating with the base station using a second radio access technology, determine that a quantity of requests to deactivate a default bearer associated with the first radio access technology satisfies a threshold based on transmitting the tracking area update, and perform a second attach procedure to attach to the base station for communications using the second radio access technology based on determining that the quantity of requests satisfies the threshold.
  • the communications manager 415 may be an example of aspects of the communications manager 710 described herein.
  • the communications manager 415 may be implemented in hardware, code (e.g., software or firmware) executed by a processor, or any combination thereof. If implemented in code executed by a processor, the functions of the communications manager 415, or its sub-components may be executed by a general-purpose processor, a DSP, an application-specific integrated circuit (ASIC) , a FPGA or other programmable logic device, discrete gate or transistor logic, discrete hardware components, or any combination thereof designed to perform the functions described in the present disclosure.
  • code e.g., software or firmware
  • ASIC application-specific integrated circuit
  • the communications manager 415 may be physically located at various positions, including being distributed such that portions of functions are implemented at different physical locations by one or more physical components.
  • the communications manager 415, or its sub-components may be a separate and distinct component in accordance with various aspects of the present disclosure.
  • the communications manager 415, or its sub-components may be combined with one or more other hardware components, including but not limited to an input/output (I/O) component, a transceiver, a network server, another computing device, one or more other components described in the present disclosure, or a combination thereof in accordance with various aspects of the present disclosure.
  • I/O input/output
  • the transmitter 420 may transmit signals generated by other components of the device 405.
  • the transmitter 420 may be collocated with a receiver 410 in a transceiver module.
  • the transmitter 420 may be an example of aspects of the transceiver 720 described with reference to FIG. 7.
  • the transmitter 420 may utilize a single antenna or a set of antennas.
  • FIG. 5 shows a block diagram 500 of a device 505 that supports connectivity with non-standalone cells in accordance with aspects of the present disclosure.
  • the device 505 may be an example of aspects of a device 405, or a UE 115 as described herein.
  • the device 505 may include a receiver 510, a communications manager 515, and a transmitter 535.
  • the device 505 may also include a processor. Each of these components may be in communication with one another (e.g., via one or more buses) .
  • the receiver 510 may receive information such as packets, user data, or control information associated with various information channels (e.g., control channels, data channels, and information related to connectivity with non-standalone cells, etc. ) . Information may be passed on to other components of the device 505.
  • the receiver 510 may be an example of aspects of the transceiver 720 described with reference to FIG. 7.
  • the receiver 510 may utilize a single antenna or a set of antennas.
  • the communications manager 515 may be an example of aspects of the communications manager 415 as described herein.
  • the communications manager 515 may include an attachment manager 520, a TAU manager 525, and a bearer manager 530.
  • the communications manager 515 may be an example of aspects of the communications manager 710 described herein.
  • the attachment manager 520 may perform a first attach procedure to attach to a base station for communications using a first radio access technology.
  • the TAU manager 525 may transmit, to the base station, a tracking area update to indicate support for communicating with the base station using a second radio access technology.
  • the bearer manager 530 may determine that a quantity of requests to deactivate a default bearer associated with the first radio access technology satisfies a threshold based on transmitting the tracking area update.
  • the attachment manager 520 may perform a second attach procedure to attach to the base station for communications using the second radio access technology based on determining that the quantity of requests satisfies the threshold.
  • the transmitter 535 may transmit signals generated by other components of the device 505.
  • the transmitter 535 may be collocated with a receiver 510 in a transceiver module.
  • the transmitter 535 may be an example of aspects of the transceiver 720 described with reference to FIG. 7.
  • the transmitter 535 may utilize a single antenna or a set of antennas.
  • FIG. 6 shows a block diagram 600 of a communications manager 605 that supports connectivity with non-standalone cells in accordance with aspects of the present disclosure.
  • the communications manager 605 may be an example of aspects of a communications manager 415, a communications manager 515, or a communications manager 710 described herein.
  • the communications manager 605 may include an attachment manager 610, a TAU manager 615, a bearer manager 620, a detachment manager 625, a service request manager 630, and a RRC manager 635. Each of these modules may communicate, directly or indirectly, with one another (e.g., via one or more buses) .
  • the attachment manager 610 may perform a first attach procedure to attach to a base station for communications using a first radio access technology.
  • the TAU manager 615 may transmit, to the base station, a tracking area update to indicate support for communicating with the base station using a second radio access technology.
  • the bearer manager 620 may determine that a quantity of requests to deactivate a default bearer associated with the first radio access technology satisfies a threshold based on transmitting the tracking area update.
  • the attachment manager 610 may perform a second attach procedure to attach to the base station for communications using the second radio access technology based on determining that the quantity of requests satisfies the threshold.
  • the bearer manager 620 may receive at least one request to deactivate the default bearer for communications with the base station based on the transmitting, where determining that the quantity of requests satisfies the threshold is based on receiving the at least one request. In some examples, the bearer manager 620 may increment a counter after receiving each request to deactivate the default bearer for communications with the base station, where determining that the quantity of requests satisfies the threshold is based on incrementing the counter. In some examples, the bearer manager 620 may reactivate the default bearer and the service request manager 630 may transmit service requests to connect to the base station using the second radio access technology until a value of the counter satisfies the threshold.
  • the attachment manager 610 may transmit an attach request to the base station to attach to the base station for communications using the first radio access technology and the second radio access technology. In some examples, the attachment manager 610 may receive an attach accept message from the base station based on transmitting the attach request.
  • the detachment manager 625 may transmit a detach request to the base station to detach from the base station prior to performing the second attach procedure. In some examples, the detachment manager 625 may receive a detach accept message from the base station based on transmitting the detach request, where transmitting the attach request is based on receiving the detach accept message.
  • the service request manager 630 may transmit a service request to the base station to set up a dedicated radio bearer for communicating with the base station using the second radio access technology.
  • the RRC manager 635 may receive a radio resource control reconfiguration message indicating a secondary cell group associated with the second radio access technology.
  • the RRC manager 635 may transmit a radio resource control reconfiguration complete message to the base station.
  • the bearer manager 620 may communicate with cells in the secondary cell group associated with the second radio access technology using the dedicated radio bearer.
  • the first radio access technology includes LTE and the second radio access technology includes 5G.
  • FIG. 7 shows a diagram of a system 700 including a device 705 that supports connectivity with non-standalone cells in accordance with aspects of the present disclosure.
  • the device 705 may be an example of or include the components of device 405, device 505, or a UE 115 as described herein.
  • the device 705 may include components for bi-directional voice and data communications including components for transmitting and receiving communications, including a communications manager 710, an I/O controller 715, a transceiver 720, an antenna 725, memory 730, and a processor 740. These components may be in electronic communication via one or more buses (e.g., bus 745) .
  • buses e.g., bus 745
  • the communications manager 710 may perform a first attach procedure to attach to a base station for communications using a first radio access technology, transmit, to the base station, a tracking area update to indicate support for communicating with the base station using a second radio access technology, determine that a quantity of requests to deactivate a default bearer associated with the first radio access technology satisfies a threshold based on transmitting the tracking area update, and perform a second attach procedure to attach to the base station for communications using the second radio access technology based on determining that the quantity of requests satisfies the threshold.
  • the I/O controller 715 may manage input and output signals for the device 705.
  • the I/O controller 715 may also manage peripherals not integrated into the device 705.
  • the I/O controller 715 may represent a physical connection or port to an external peripheral.
  • the I/O controller 715 may utilize an operating system such as or another known operating system.
  • the I/O controller 715 may represent or interact with a modem, a keyboard, a mouse, a touchscreen, or a similar device.
  • the I/O controller 715 may be implemented as part of a processor.
  • a user may interact with the device 705 via the I/O controller 715 or via hardware components controlled by the I/O controller 715.
  • the transceiver 720 may communicate bi-directionally, via one or more antennas, wired, or wireless links as described above.
  • the transceiver 720 may represent a wireless transceiver and may communicate bi-directionally with another wireless transceiver.
  • the transceiver 720 may also include a modem to modulate the packets and provide the modulated packets to the antennas for transmission, and to demodulate packets received from the antennas.
  • the wireless device may include a single antenna 725. However, in some cases the device may have more than one antenna 725, which may be capable of concurrently transmitting or receiving multiple wireless transmissions.
  • the memory 730 may include RAM and ROM.
  • the memory 730 may store computer-readable, computer-executable code 735 including instructions that, when executed, cause the processor to perform various functions described herein.
  • the memory 730 may contain, among other things, a BIOS which may control basic hardware or software operation such as the interaction with peripheral components or devices.
  • the processor 740 may include an intelligent hardware device, (e.g., a general-purpose processor, a DSP, a CPU, a microcontroller, an ASIC, an FPGA, a programmable logic device, a discrete gate or transistor logic component, a discrete hardware component, or any combination thereof) .
  • the processor 740 may be configured to operate a memory array using a memory controller.
  • a memory controller may be integrated into the processor 740.
  • the processor 740 may be configured to execute computer-readable instructions stored in a memory (e.g., the memory 730) to cause the device 705 to perform various functions (e.g., functions or tasks supporting connectivity with non-standalone cells) .
  • the code 735 may include instructions to implement aspects of the present disclosure, including instructions to support wireless communications.
  • the code 735 may be stored in a non-transitory computer-readable medium such as system memory or other type of memory. In some cases, the code 735 may not be directly executable by the processor 740 but may cause a computer (e.g., when compiled and executed) to perform functions described herein.
  • FIG. 8 shows a flowchart illustrating a method 800 that supports connectivity with non-standalone cells in accordance with aspects of the present disclosure.
  • the operations of method 800 may be implemented by a UE 115 or its components as described herein.
  • the operations of method 800 may be performed by a communications manager as described with reference to FIGs. 4 through 7.
  • a UE may execute a set of instructions to control the functional elements of the UE to perform the functions described below. Additionally, or alternatively, a UE may perform aspects of the functions described below using special-purpose hardware.
  • the UE may perform a first attach procedure to attach to a base station for communications using a first radio access technology.
  • the operations of 805 may be performed according to the methods described herein. In some examples, aspects of the operations of 805 may be performed by an attachment manager as described with reference to FIGs. 4 through 7.
  • the UE may transmit, to the base station, a tracking area update to indicate support for communicating with the base station using a second radio access technology.
  • the operations of 810 may be performed according to the methods described herein. In some examples, aspects of the operations of 810 may be performed by a TAU manager as described with reference to FIGs. 4 through 7.
  • the UE may determine that a quantity of requests to deactivate a default bearer associated with the first radio access technology satisfies a threshold based on transmitting the tracking area update.
  • the operations of 815 may be performed according to the methods described herein. In some examples, aspects of the operations of 815 may be performed by a bearer manager as described with reference to FIGs. 4 through 7.
  • the UE may perform a second attach procedure to attach to the base station for communications using the second radio access technology based on determining that the quantity of requests satisfies the threshold.
  • the operations of 820 may be performed according to the methods described herein. In some examples, aspects of the operations of 820 may be performed by an attachment manager as described with reference to FIGs. 4 through 7.
  • LTE, LTE-A, LTE-A Pro, or NR may be described for purposes of example, and LTE, LTE-A, LTE-A Pro, or NR terminology may be used in much of the description, the techniques described herein are applicable beyond LTE, LTE-A, LTE-A Pro, or NR networks.
  • the described techniques may be applicable to various other wireless communications systems such as Ultra Mobile Broadband (UMB) , Institute of Electrical and Electronics Engineers (IEEE) 802.11 (Wi-Fi) , IEEE 802.16 (WiMAX) , IEEE 802.20, Flash-OFDM, as well as other systems and radio technologies not explicitly mentioned herein.
  • UMB Ultra Mobile Broadband
  • IEEE Institute of Electrical and Electronics Engineers
  • Wi-Fi Institute of Electrical and Electronics Engineers
  • WiMAX IEEE 802.16
  • IEEE 802.20 Flash-OFDM
  • Information and signals described herein may be represented using any of a variety of different technologies and techniques.
  • data, instructions, commands, information, signals, bits, symbols, and chips that may be referenced throughout the description may be represented by voltages, currents, electromagnetic waves, magnetic fields or particles, optical fields or particles, or any combination thereof.
  • a general-purpose processor may be a microprocessor, but in the alternative, the processor may be any processor, controller, microcontroller, or state machine.
  • a processor may also be implemented as a combination of computing devices (e.g., a combination of a DSP and a microprocessor, multiple microprocessors, one or more microprocessors in conjunction with a DSP core, or any other such configuration) .
  • the functions described herein may be implemented in hardware, software executed by a processor, firmware, or any combination thereof. If implemented in software executed by a processor, the functions may be stored on or transmitted over as one or more instructions or code on a computer-readable medium. Other examples and implementations are within the scope of the disclosure and appended claims. For example, due to the nature of software, functions described herein may be implemented using software executed by a processor, hardware, firmware, hardwiring, or combinations of any of these. Features implementing functions may also be physically located at various positions, including being distributed such that portions of functions are implemented at different physical locations.
  • Computer-readable media includes both non-transitory computer storage media and communication media including any medium that facilitates transfer of a computer program from one place to another.
  • a non-transitory storage medium may be any available medium that may be accessed by a general-purpose or special purpose computer.
  • non-transitory computer-readable media may include random-access memory (RAM) , read-only memory (ROM) , electrically erasable programmable ROM (EEPROM) , flash memory, compact disk (CD) ROM or other optical disk storage, magnetic disk storage or other magnetic storage devices, or any other non-transitory medium that may be used to carry or store desired program code means in the form of instructions or data structures and that may be accessed by a general-purpose or special-purpose computer, or a general-purpose or special-purpose processor. Also, any connection is properly termed a computer-readable medium.
  • RAM random-access memory
  • ROM read-only memory
  • EEPROM electrically erasable programmable ROM
  • flash memory compact disk (CD) ROM or other optical disk storage
  • CD compact disk
  • magnetic disk storage or other magnetic storage devices or any other non-transitory medium that may be used to carry or store desired program code means in the form of instructions or data structures and that may be accessed by a general-purpose or special-purpose computer,
  • Disk and disc include CD, laser disc, optical disc, digital versatile disc (DVD) , floppy disk and Blu-ray disc where disks usually reproduce data magnetically, while discs reproduce data optically with lasers. Combinations of the above are also included within the scope of computer-readable media.

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Abstract

L'invention concerne des procédés, des systèmes et des dispositifs de communications sans fil. Comme décrit dans la présente invention, un équipement utilisateur (UE) peut prendre en charge des communications avec une station de base à l'aide d'une première technologie d'accès radio (RAT) et d'une seconde RAT, et l'UE peut prendre en charge des techniques efficaces de connexion à la seconde RAT à l'aide d'une procédure de rattachement pour déclencher une procédure d'addition de groupe de cellules secondaires (SCG). L'UE peut d'abord transmettre une mise à jour de zone de suivi (TAU) pour déclencher une procédure SCG afin de permettre des communications avec une station de base à l'aide de la seconde RAT, et l'UE peut recevoir une demande de désactivation d'un contexte de support de système paquet évolué (EPS). Si l'UE détermine qu'une quantité de demandes pour désactiver le contexte de support d'EPS satisfait un seuil, l'UE peut effectuer la procédure de rattachement pour déclencher la procédure d'addition de SCG pour permettre des communications avec la station de base à l'aide de la seconde RAT.
PCT/CN2020/084023 2020-04-09 2020-04-09 Connectivité avec des cellules non autonomes WO2021203375A1 (fr)

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