WO2021248258A1 - Connexion stable de groupe de cellules secondaires - Google Patents

Connexion stable de groupe de cellules secondaires Download PDF

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Publication number
WO2021248258A1
WO2021248258A1 PCT/CN2020/094822 CN2020094822W WO2021248258A1 WO 2021248258 A1 WO2021248258 A1 WO 2021248258A1 CN 2020094822 W CN2020094822 W CN 2020094822W WO 2021248258 A1 WO2021248258 A1 WO 2021248258A1
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WO
WIPO (PCT)
Prior art keywords
network node
radio link
scg
connection configuration
configuration
Prior art date
Application number
PCT/CN2020/094822
Other languages
English (en)
Inventor
Ying Wang
Chaofeng HUI
Wulin WANG
Ye Liu
Original Assignee
Qualcomm Incorporated
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Filing date
Publication date
Application filed by Qualcomm Incorporated filed Critical Qualcomm Incorporated
Priority to PCT/CN2020/094822 priority Critical patent/WO2021248258A1/fr
Publication of WO2021248258A1 publication Critical patent/WO2021248258A1/fr

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    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04W—WIRELESS COMMUNICATION NETWORKS
    • H04W76/00—Connection management
    • H04W76/10—Connection setup
    • H04W76/19—Connection re-establishment
    • 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

  • SCG stable secondary cell group
  • Wireless communication systems have developed through various generations, including a first-generation analog wireless phone service (1G) , a second-generation (2G) digital wireless phone service (including interim 2.5G and 2.75G networks) , a third-generation (3G) high speed data, Internet-capable wireless service and a fourth-generation (4G) service (e.g., Long-Term Evolution (LTE) or WiMax) .
  • 1G first-generation analog wireless phone service
  • 2G second-generation
  • 3G third-generation
  • 4G fourth-generation
  • LTE Long-Term Evolution
  • WiMax Worldwide Interoperability for Mobile communications
  • PCS Personal Communications Service
  • Examples of known cellular systems include the cellular Analog Advanced Mobile Phone System (AMPS) , and digital cellular systems based on Code Division Multiple Access (CDMA) , Frequency Division Multiple Access (FDMA) , Time Division Multiple Access (TDMA) , the Global System for Mobile access (GSM) variation of TDMA, etc.
  • AMPS cellular Analog Advanced Mobile Phone System
  • CDMA Code Division Multiple Access
  • FDMA Frequency Division Multiple Access
  • TDMA Time Division Multiple Access
  • GSM Global System for Mobile access
  • a fifth generation (5G) mobile standard calls for higher data transfer speeds, greater numbers of connections, and better coverage, among other improvements.
  • the 5G standard according to the Next Generation Mobile Networks Alliance, is designed to provide data rates of several tens of megabits per second to each of tens of thousands of users, with 1 gigabit per second to tens of workers on an office floor. Several hundreds of thousands of simultaneous connections should be supported in order to support large sensor deployments. Consequently, the spectral efficiency of 5G mobile communications should be significantly enhanced compared to the current 4G standard. Furthermore, signaling efficiencies should be enhanced and latency should be substantially reduced compared to current standards.
  • NR connectivity or simply NR connectivity, has gained significant commercial traction in recent time.
  • UI user interface
  • UE user equipment
  • the UE may comprise a processor, a memory, and a transceiver.
  • the processor, the memory, and/or the transceiver may be configured to establish a first radio link between the UE and a first network node of the first RAT.
  • the first radio link may be available for communication between the UE and the first network node.
  • the processor, the memory, and/or the transceiver may also be configured to add a second network node of the second RAT as a secondary cell in a secondary cell group (SCG) .
  • SCG secondary cell group
  • a second radio link may be established between the UE and the second network node when the second network node is added in the SCG.
  • the second radio link may be available for communication between the UE and the second network node.
  • the processor, the memory, and/or the transceiver may further be configured to store a split bearer configuration subsequent to adding the second network node to the SCG.
  • the split bearer configuration may comprise information of a bearer configuration of the second radio link established between the UE and the second network node.
  • the processor, the memory, and/or the transceiver may yet be configured to reestablish the first radio link upon detection of a failure of the first radio link.
  • the processor, the memory, and/or the transceiver may yet further be configured to add back the second network node in the SCG based on the stored split bearer configuration.
  • the second network node may be added back subsequent to reestablishing the first radio link.
  • the second radio link may be available for communication between the UE and the second network node when the second network node is added back in the SCG.
  • the method may comprise establishing a first radio link between the UE and a first network node of the first RAT.
  • the first radio link may be available for communication between the UE and the first network node.
  • the method may also comprise adding a second network node of the second RAT as a secondary cell in a secondary cell group (SCG) .
  • SCG secondary cell group
  • a second radio link may be established between the UE and the second network node when the second network node is added in the SCG.
  • the second radio link may be available for communication between the UE and the second network node.
  • the method may further comprise storing a split bearer configuration subsequent to adding the second network node to the SCG.
  • the split bearer configuration may comprise information of a bearer configuration of the second radio link established between the UE and the second network node.
  • the method may yet comprise reestablishing the first radio link upon detection of a failure of the first radio link.
  • the method may yet further comprise adding back the second network node in the SCG based on the stored split bearer configuration.
  • the second network node may be added back subsequent to reestablishing the first radio link.
  • the second radio link may be available for communication between the UE and the second network node when the second network node is added back in the SCG.
  • the UE may comprise means for establishing a first radio link between the UE and a first network node of the first RAT.
  • the first radio link may be available for communication between the UE and the first network node.
  • the UE may also comprise means for adding a second network node of the second RAT as a secondary cell in a secondary cell group (SCG) .
  • SCG secondary cell group
  • a second radio link may be established between the UE and the second network node when the second network node is added in the SCG.
  • the second radio link may be available for communication between the UE and the second network node.
  • the UE may further comprise means for storing a split bearer configuration subsequent to adding the second network node to the SCG.
  • the split bearer configuration may comprise information of a bearer configuration of the second radio link established between the UE and the second network node.
  • the UE may yet comprise means for reestablishing the first radio link upon detection of a failure of the first radio link.
  • the UE may yet further comprise means for adding back the second network node in the SCG based on the stored split bearer configuration.
  • the second network node may be added back subsequent to reestablishing the first radio link.
  • the second radio link may be available for communication between the UE and the second network node when the second network node is added back in the SCG.
  • a non-transitory computer-readable medium storing computer-executable instructions for a user equipment (UE) configured to operate in first and second radio access technologies (RATs) is disclosed.
  • the executable instructions may comprise one or more instructions instructing the UE to establish a first radio link between the UE and a first network node of the first RAT.
  • the first radio link may be available for communication between the UE and the first network node.
  • the executable instructions may also comprise one or more instructions instructing the UE to add a second network node of the second RAT as a secondary cell in a secondary cell group (SCG) .
  • SCG secondary cell group
  • a second radio link may be established between the UE and the second network node when the second network node is added in the SCG.
  • the second radio link may be available for communication between the UE and the second network node.
  • the executable instructions may further comprise one or more instructions instructing the UE to store a split bearer configuration subsequent to adding the second network node to the SCG.
  • the split bearer configuration may comprise information of a bearer configuration of the second radio link established between the UE and the second network node.
  • the executable instructions may yet comprise one or more instructions instructing the UE to reestablish the first radio link upon detection of a failure of the first radio link.
  • the executable instructions may yet further comprise one or more instructions instructing the UE to add back the second network node in the SCG based on the stored split bearer configuration.
  • the second network node may be added back subsequent to reestablishing the first radio link.
  • the second radio link may be available for communication between the UE and the second network node when the second network node is added back in the SCG.
  • FIG. 1 illustrates an exemplary wireless communications system in accordance with one or more aspects of the disclosure
  • FIG. 2 is a simplified block diagram of several sample aspects of components that may be employed in wireless communication nodes and configured to support communication in accordance with one or more aspects of the disclosure;
  • FIG. 3 illustrates a flow of an example scenario in which a user equipment maintains a stable secondary cell group connection with a network in accordance with one or more aspects of the disclosure
  • FIGs. 4-7 illustrate flow charts of an exemplary method performed by a user equipment to maintain a stable secondary cell group connection with a network in accordance with one or more aspects of the disclosure
  • FIG. 8 illustrates a simplified block diagram of several sample aspects of an apparatus configured for self-adaption in accordance with one or more aspects of the disclosure.
  • various aspects may be described in terms of sequences of actions to be performed by, for example, elements of a computing device.
  • Those skilled in the art will recognize that various actions described herein can be performed by specific circuits (e.g., an application specific integrated circuit (ASIC) ) , by program instructions being executed by one or more processors, or by a combination of both.
  • these sequences of actions described herein can be considered to be embodied entirely within any form of non-transitory computer-readable medium having stored thereon a corresponding set of computer instructions that upon execution would cause an associated processor to perform the functionality described herein.
  • the various aspects described herein may be embodied in a number of different forms, all of which have been contemplated to be within the scope of the claimed subject matter.
  • the corresponding form of any such aspects may be described herein as, for example, “logic configured to” and/or other structural components configured to perform the described action.
  • UE user equipment
  • base station base station
  • RAT Radio Access Technology
  • UEs may be any wireless communication device (e.g., a mobile phone, router, tablet computer, laptop computer, tracking device, Internet of Things (IoT) device, etc. ) used by a user to communicate over a wireless communications network.
  • a UE may be mobile or may (e.g., at certain times) be stationary, and may communicate with a Radio Access Network (RAN) .
  • RAN Radio Access Network
  • UE may be referred to interchangeably as an “access terminal” or “AT, ” a “client device, ” a “wireless device, ” a “subscriber device, ” a “subscriber terminal, ” a “subscriber station, ” a “user terminal” or UT, a “mobile terminal, ” a “mobile station, ” or variations thereof.
  • AT access terminal
  • client device a “client device
  • wireless device a “subscriber device, ” a “subscriber terminal, ” a “subscriber station, ” a “user terminal” or UT
  • UEs can communicate with a core network via a RAN, and through the core network the UEs can be connected with external networks such as the Internet and with other UEs.
  • WiFi networks e.g., based on Institute of Electrical and Electronics Engineers (IEEE) 802.11, etc.
  • IEEE Institute of Electrical and Electronics Engineers
  • a base station may operate according to one of several RATs in communication with UEs depending on the network in which it is deployed, and may be alternatively referred to as an Access Point (AP) , a Network Node, a NodeB, an evolved NodeB (eNB) , a general Node B (gNodeB, gNB) , etc.
  • AP Access Point
  • eNB evolved NodeB
  • gNodeB gNodeB, gNB
  • a base station may provide edge node signaling functions while in other systems it may provide additional control and/or network management functions.
  • UEs can be embodied by any of a number of types of devices including but not limited to printed circuit (PC) cards, compact flash devices, external or internal modems, wireless or wireline phones, smartphones, tablets, tracking devices, asset tags, and so on.
  • a communication link through which UEs can send signals to a RAN is called an uplink channel (e.g., a reverse traffic channel, a reverse control channel, an access channel, etc. ) .
  • a communication link through which the RAN can send signals to UEs is called a downlink or forward link channel (e.g., a paging channel, a control channel, a broadcast channel, a forward traffic channel, etc. ) .
  • traffic channel can refer to either an uplink /reverse or downlink /forward traffic channel.
  • FIG. 1 illustrates an exemplary wireless communications system 100 according to one or more aspects.
  • the wireless communications system 100 which may also be referred to as a wireless wide area network (WWAN) , may include various base stations 102 and various UEs 104.
  • the base stations 102 may include macro cells (high power cellular base stations) and/or small cells (low power cellular base stations) .
  • the macro cells may include Evolved NodeBs (eNBs) where the wireless communications system 100 corresponds to an Long-Term Evolution (LTE) network, gNodeBs (gNBs) where the wireless communications system 100 corresponds to a 5G network, and/or a combination thereof, and the small cells may include femtocells, picocells, microcells, etc.
  • LTE Long-Term Evolution
  • gNodeBs gNodeBs
  • the base stations 102 may collectively form a Radio Access Network (RAN) and interface with an Evolved Packet Core (EPC) or Next Generation Core (NGC) through backhaul links.
  • EPC Evolved Packet Core
  • NRC Next Generation Core
  • the base stations 102 may perform functions that relate to one or more of transferring user data, radio channel ciphering and deciphering, integrity protection, header compression, mobility control functions (e.g., handover, dual connectivity) , inter-cell interference coordination, connection setup and release, load balancing, distribution for non-access stratum (NAS) messages, NAS node selection, synchronization, RAN sharing, multimedia broadcast multicast service (MBMS) , subscriber and equipment trace, RAN information management (RIM) , paging, positioning, and delivery of warning messages.
  • the base stations 102 may communicate with each other directly or indirectly (e.g., through the EPC /NGC) over backhaul links 134, which may be wired or wireless.
  • the base stations 102 may wirelessly communicate with the UEs 104. Each of the base stations 102 may provide communication coverage for a respective geographic coverage area 110. In an aspect, although not shown in FIG. 1, coverage areas 110 may be subdivided into a plurality of cells (e.g., three) , or sectors, each cell corresponding to a single antenna or array of antennas of a base station 102. As used herein, the term “cell” or “sector” may correspond to one of a plurality of cells of a base station 102, or to the base station 102 itself, depending on the context.
  • While neighbor macro cell geographic coverage areas 110 may partially overlap (e.g., in a handover region) , some of the geographic coverage areas 110 may be substantially overlapped by a larger geographic coverage area 110.
  • a small cell base station 102' may have a coverage area 110' that substantially overlaps with the coverage area 110 of one or more macro cell base stations 102.
  • a network that includes both small cell and macro cells may be known as a heterogeneous network.
  • a heterogeneous network may also include Home eNBs (HeNBs) and/or Home gNodeBs, which may provide service to a restricted group known as a closed subscriber group (CSG) .
  • HeNBs Home eNBs
  • CSG closed subscriber group
  • the communication links 120 between the base stations 102 and the UEs 104 may include uplink (UL) (also referred to as reverse link) transmissions from a UE 104 to a base station 102 and/or downlink (DL) (also referred to as forward link) transmissions from a base station 102 to a UE 104.
  • the communication links 120 may use multiple input multiple output (MIMO) antenna technology, including spatial multiplexing, beamforming, and/or transmit diversity.
  • MIMO multiple input multiple output
  • the communication links may be through one or more carriers. Allocation of carriers may be asymmetric with respect to DL and UL (e.g., more or less carriers may be allocated for DL than for UL) .
  • the wireless communications system 100 may further include a wireless local area network (WLAN) access point (AP) 150 in communication with WLAN stations (STAs) 152 via communication links 154 in an unlicensed frequency spectrum (e.g., 5 GHz) .
  • WLAN wireless local area network
  • AP access point
  • the WLAN STAs 152 and/or the WLAN AP 150 may perform a clear channel assessment (CCA) prior to communicating in order to determine whether the channel is available.
  • CCA clear channel assessment
  • the small cell base station 102' may operate in a licensed and/or an unlicensed frequency spectrum. When operating in an unlicensed frequency spectrum, the small cell base station 102' may employ LTE or 5G technology and use the same 5 GHz unlicensed frequency spectrum as used by the WLAN AP 150. The small cell base station 102', employing LTE /5G in an unlicensed frequency spectrum, may boost coverage to and/or increase capacity of the access network. LTE in an unlicensed spectrum may be referred to as LTE-unlicensed (LTE-U) , licensed assisted access (LAA) , or MulteFire.
  • LTE-U LTE-unlicensed
  • LAA licensed assisted access
  • MulteFire MulteFire
  • the wireless communications system 100 may further include a mmW base station 180 that may operate in mmW frequencies and/or near mmW frequencies in communication with a UE 182.
  • Extremely high frequency (EHF) is part of the radio frequency (RF) range in the electromagnetic spectrum. EHF has a range of 30 GHz to 300 GHz and a wavelength between 1 millimeter and 10 millimeters. Radio waves in this band may be referred to as a millimeter wave.
  • Near mmW may extend down to a frequency of 3 GHz with a wavelength of 100 millimeters.
  • the super high frequency (SHF) band extends between 3 GHz and 30 GHz, also referred to as centimeter wave.
  • the mmW base station 180 may utilize beamforming 184 with the UE 182 to compensate for the extremely high path loss and short range. Further, it will be appreciated that in alternative configurations, one or more base stations 102 may also transmit using mmW or near mmW and beamforming. Accordingly, it will be appreciated that the foregoing illustrations are merely examples and should not be construed to limit the various aspects disclosed herein.
  • the wireless communications system 100 may further include one or more UEs, such as UE 190, that connects indirectly to one or more communication networks via one or more device-to-device (D2D) peer-to-peer (P2P) links.
  • D2D device-to-device
  • P2P peer-to-peer
  • UE 190 has a D2D P2P link 192 with one of the UEs 104 connected to one of the base stations 102 (e.g., through which UE 190 may indirectly obtain cellular connectivity) and a D2D P2P link 194 with WLAN STA 152 connected to the WLAN AP 150 (through which UE 190 may indirectly obtain WLAN-based Internet connectivity) .
  • the D2D P2P links 192-194 may be supported with any well-known D2D radio access technology (RAT) , such as LTE Direct (LTE-D) , WiFi Direct (WiFi-D) , Bluetooth, and so on.
  • RAT D2D radio access technology
  • Any of the base stations 102, 102’, 180 may send measurement requests (e.g., measurement control order (MCO) ) to the UEs 104, 182, 190, and the UE’s 104, 182, 190 may respond with measurement reports accordingly.
  • MCO measurement control order
  • FIG. 2 illustrates several sample components (represented by corresponding blocks) that may be incorporated into an apparatus 202 and an apparatus 204 (corresponding to, for example, a UE and a base station (e.g., eNB, gNB) , respectively, to support the operations as disclosed herein.
  • the apparatus 202 may correspond to a UE
  • the apparatus 204 may correspond to a network node such as a gNB and/or an eNB.
  • the components may be implemented in different types of apparatuses in different implementations (e.g., in an ASIC, in a System-on-Chip (SoC) , etc. ) .
  • the illustrated components may also be incorporated into other apparatuses in a communication system.
  • apparatuses in a system may include components similar to those described to provide similar functionality.
  • a given apparatus may contain one or more of the components.
  • an apparatus may include multiple transceiver components that enable the apparatus to operate on multiple carriers and/or communicate via different technologies.
  • the apparatus 202 and the apparatus 204 each may include at least one wireless communication device (represented by the communication devices 208 and 214) for communicating with other nodes via at least one designated RAT (e.g., LTE, New Radio (NR) ) .
  • Each communication device 208 may include at least one transmitter (represented by the transmitter 210) for transmitting and encoding signals (e.g., messages, indications, information, and so on) and at least one receiver (represented by the receiver 212) for receiving and decoding signals (e.g., messages, indications, information, pilots, and so on) .
  • Each communication device 214 may include at least one transmitter (represented by the transmitter 216) for transmitting signals (e.g., messages, indications, information, pilots, and so on) and at least one receiver (represented by the receiver 218) for receiving signals (e.g., messages, indications, information, and so on) .
  • signals e.g., messages, indications, information, pilots, and so on
  • receiver 2148 for receiving signals (e.g., messages, indications, information, and so on) .
  • a transmitter and a receiver may comprise an integrated device (e.g., embodied as a transmitter circuit and a receiver circuit of a single communication device) in some implementations, may comprise a separate transmitter device and a separate receiver device in some implementations, or may be embodied in other ways in other implementations.
  • a transmitter may include a plurality of antennas, such as an antenna array, that permits the respective apparatus to perform transmit “beamforming, ” as described further herein.
  • a receiver may include a plurality of antennas, such as an antenna array, that permits the respective apparatus to perform receive beamforming, as described further herein.
  • the transmitter and receiver may share the same plurality of antennas, such that the respective apparatus can only receive or transmit at a given time, not both at the same time.
  • a wireless communication device (e.g., one of multiple wireless communication devices) of the apparatus 204 may also comprise a Network Listen Module (NLM) or the like for performing various measurements.
  • NLM Network Listen Module
  • the apparatus 204 may include at least one communication device (represented by the communication device 220) for communicating with other nodes.
  • the communication device 220 may comprise a network interface (e.g., one or more network access ports) configured to communicate with one or more network entities via a wire-based or wireless backhaul connection.
  • the communication device 220 may be implemented as a transceiver configured to support wire-based or wireless signal communication. This communication may involve, for example, sending and receiving messages, parameters, or other types of information.
  • the communication device 220 is shown as comprising a transmitter 222 and a receiver 224 (e.g., network access ports for transmitting and receiving) .
  • the apparatuses 202 and 204 may also include other components used in conjunction with the operations as disclosed herein.
  • the apparatus 202 may include a processing system 232 for providing functionality relating to, for example, communication with the network.
  • the apparatus 204 may include a processing system 234 for providing functionality relating to, for example, communication with the UEs.
  • the processing systems 232 and 234 may include, for example, one or more general purpose processors, multi-core processors, ASICs, digital signal processors (DSPs) , field programmable gate arrays (FPGA) , or other programmable logic devices or processing circuitry.
  • the apparatuses 202 and 204 may include measurement components 252 and 254 that may be used to obtain channel related measurements.
  • the measurement component 252 may measure one or more downlink (DL) signals such as channel state information reference signal (CSI-RS) , phase tracking reference signal (PTRS) , primary synchronization signal (PSS) , secondary synchronization signal (SSS) , demodulation reference signal (DMRS) , etc.
  • the measurement component 254 may measure one or more uplink (UL) signals such as DMRS, sounding reference signal (SRS) , etc.
  • DL downlink
  • PTRS phase tracking reference signal
  • PSS primary synchronization signal
  • SSS secondary synchronization signal
  • DMRS demodulation reference signal
  • UL uplink
  • the apparatuses 202 and 204 may include memory components 238 and 240 (e.g., each including a memory device) , respectively, for maintaining information (e.g., information indicative of reserved resources, thresholds, parameters, and so on) .
  • memory 238 can comprise a computer-readable medium storing one or more computer-executable instructions for a user equipment (UE) where the one or more instructions instruct apparatus 202 (e.g., processing system 232 in combination with communications device 208 and/or other aspects of apparatus 202) to perform any of the functions discussed herein.
  • UE user equipment
  • the apparatuses 202 and 204 may include user interface devices 244 and 246, respectively, for providing indications (e.g., audible and/or visual indications) to a user and/or for receiving user input (e.g., upon user actuation of a sensing device such a keypad, a touch screen, a microphone, and so on) .
  • indications e.g., audible and/or visual indications
  • user input e.g., upon user actuation of a sensing device such a keypad, a touch screen, a microphone, and so on.
  • the apparatus 202 may include a timer 256 and a counter.
  • the timer 256 may be configured to measure or otherwise determine one or more time durations.
  • the counter 258 may be configured to count or otherwise determine occurrences of one or more events.
  • the apparatuses 202 and 204 are shown in FIG. 2 as including various components that may be configured according to the various examples described herein. It will be appreciated, however, that the illustrated blocks may have different functionality in different designs.
  • the components of FIG. 2 may be implemented in various ways.
  • the components of FIG. 2 may be implemented in one or more circuits such as, for example, one or more processors and/or one or more ASICs (which may include one or more processors) .
  • each circuit may use and/or incorporate at least one memory component for storing information or executable code used by the circuit to provide this functionality.
  • some or all of the functionality represented by blocks 208, 232, 238, and 244 may be implemented by processor and memory component (s) of the apparatus 202 (e.g., by execution of appropriate code and/or by appropriate configuration of processor components) .
  • some or all of the functionality represented by blocks 214, 220, 234, 240, and 246 may be implemented by processor and memory component (s) of the apparatus 204 (e.g., by execution of appropriate code and/or by appropriate configuration of processor components) .
  • the apparatus 204 may correspond to a “small cell” or a Home gNodeB.
  • the apparatus 202 may transmit and receive messages via a wireless link 260 with the apparatus 204, the messages including information related to various types of communication (e.g., voice, data, multimedia services, associated control signaling, etc. ) .
  • the wireless link 260 may operate over a communication medium of interest, shown by way of example in FIG. 2 as the medium 262, which may be shared with other communications as well as other RATs.
  • a medium of this type may be composed of one or more frequency, time, and/or space communication resources (e.g., encompassing one or more channels across one or more carriers) associated with communication between one or more transmitter /receiver pairs, such as the apparatus 204 and the apparatus 202 for the medium 262.
  • space communication resources e.g., encompassing one or more channels across one or more carriers
  • the apparatus 202 and the apparatus 204 may operate via the wireless link 260 according to one or more radio access types, such as LTE, LTE-U, or NR, depending on the network in which they are deployed.
  • These networks may include, for example, different variants of CDMA networks (e.g., LTE networks, NR networks, etc. ) , TDMA networks, FDMA networks, Orthogonal FDMA (OFDMA) networks, Single-Carrier FDMA (SC-FDMA) networks, and so on.
  • a UE may be capable of operating in multiple radio access technologies (RATs) .
  • RATs radio access technologies
  • a UE may be capable of operating in a first RAT (e.g., LTE) and in a second RAT (e.g., NR) .
  • first and second RATs may be any of the RATs currently known (e.g., WiMax, CDMA, WCDMA, UTRA, Evolved Universal Terrestrial Radio Access (E-UTRA) , GSM, FDMA, GSM, TDMA, etc. ) .
  • a UE may be may be capable of operating in multiple RATs at the same time.
  • a UE that can operate in both LTE and NR simultaneously is an E-UTRA-NR Dual Connectivity (ENDC) capable UE.
  • ENDC is an example of Multi-RAT DC (MRDC) capability.
  • MRDC Multi-RAT DC
  • eNB base station
  • gNB base station
  • NR second RAT
  • the UE When the UE operates in the first RAT, it may communicate with a network node (e.g., base station, eNB, etc. ) of the first RAT. Similarly, when the UE operates in the second RAT, it may communicate with a network node (e.g., base station, gNB, etc. ) of the second RAT.
  • a network node e.g., base station, eNB, etc.
  • the UE may be capable of operating in a standalone (SA) or in a non-standalone (NSA) mode within a given RAT.
  • SA standalone
  • NSA non-standalone
  • the UE When operating in the SA mode, the UE is able to exchange both control and data plane (also referred to as user plane) information with the network node and/or the core network of the given RAT (e.g., NR) .
  • control and data plane also referred to as user plane
  • the UE is communicating with network nodes of the first and second RATs.
  • the UE can exchange data plane information with the network nodes of both the first RAT (e.g., LTE) and the second RAT (e.g., NR) .
  • the control plane information is exchanged only with the network node of one of the RATS, such as the first RAT (e.g., LTE) .
  • a UE working in NSA mode initially can attach to a network to an anchor cell of a first RAT (e.g., LTE) , and also add a cell of a second RAT (e.g., NR) as a cell of a secondary cell group (SCG) . That is, the UE can be initially configured by the network with correct split bearer parameters.
  • a first RAT e.g., LTE
  • a second RAT e.g., NR
  • SCG secondary cell group
  • the LTE radio link may fail for one reason or another. If the UE detects a radio link failure (RLF) in the LTE radio link (i.e., detects LTE RLF) , the UE sends a radio resource control (RRC) connection reestablishment request to the LTE anchor cell to reestablish the LTE radio link.
  • RLF radio link failure
  • RRC radio resource control
  • the LTE anchor Upon successful reestablishment of the link, the LTE anchor can send an RRC reconfiguration message to setup the SCG again.
  • the split bearer configuration parameter that comes with the RRC reconfiguration message can be invalid.
  • moreThanOneRLC information element (IE) may be missing.
  • the moreThanOneRLC field is “mandatory present mandatory present upon RRC reconfiguration with setup of a PDCP entity for a radio bearer with more than one associated logical channel and upon RRC reconfiguration with the association of additional logical channels to the PDCP entity. ”
  • the UE When the IE is missing, i.e., when the bearer configuration parameter is not valid, the UE is unable to add the SCG. As a result, UE cannot receive data services from the NR cell. The UE therefore stays to the LTE until the network sends a measurement control for the UE to measure the NR cell again, at which point, the NR cell may be added. In sum, when the UE reestablishes connection with the LTE anchor cell after an LTE RLF, the NR cell may be available to the UE for a while.
  • the UE may store, e.g., within its memory, a known good split bearer configuration.
  • the UE may see whether the split bearer configuration parameter received from the LTE anchor is invalid. If it is invalid, then the UE may add the NR cell again in the SCG based on the stored split bearer configuration.
  • FIG. 3 illustrates an example of a scenario 300 in which a UE maintains a stable SCG connection with a network.
  • the UE is multi-RAT capable.
  • the UE may be an ENDC UE capable of operating in 4G LTE and in 5G NR.
  • the sequence in scenario 400 may be as follows:
  • ⁇ UE sends attach request to LTE anchor cell with ENDC capability indication
  • ⁇ UE receives attach accept from LTE anchor cell
  • ⁇ UE and LTE anchor cell perform UE capability negotiation
  • NR node is added as a secondary cell:
  • ⁇ UE receives RRC reconfiguration message from LTE anchor cell instructing UE to measure for NR cells;
  • ⁇ UE measures signals of NR cells that neighbor LTE anchor cell —e.g., RSRP, RSRP, SINR, etc.;
  • ⁇ UE sends measurement report of NR measurements to LTE anchor cell
  • ⁇ UE receives RRC reconfiguration message from LTE anchor cell instructing UE to setup SCG with NR cell –RRC reconfiguration message includes moreThanOneRLC information element (IE) ;
  • IE ThanOneRLC information element
  • ⁇ UE processes RRC reconfiguration message to add NR cell to SCG, and sends RRC reconfiguration complete response to LTE anchor;
  • ⁇ UE receives data services from NR cell after successfully adding NR cell in SCG;
  • D. UE stores copy of good NW split bearer configuration
  • ⁇ UE detects LTE RLF
  • ⁇ UE sends RRC connection reestablishment request to LTE anchor
  • ⁇ UE receives RRC connection reestablishment acknowledgment from LTE anchor
  • ⁇ UE receives RRC reconfiguration message from LTE anchor cell instructing UE to setup SCG with NR cell, but this time with invalid configuration –RRC reconfiguration message does NOT include moreThanOneRLC IE;
  • ⁇ UE processes RRC reconfiguration message to add NR cell to SCG, and sends RRC reconfiguration complete response to LTE anchor;
  • ⁇ UE receives data services from NR cell after successfully adding NR cell in SCG;
  • ⁇ UE uses stored copy of network split bearer configuration to add NR cell to SCG, and sends RRC reconfiguration complete response to LTE anchor;
  • ⁇ UE receives data services from NR cell after successfully adding NR cell in SCG.
  • FIG. 4 illustrates a flow chart of an exemplary self-adaptation method performed by a UE, e.g., to maintain a stable secondary group connection with a network in accordance with one or more aspects of the disclosure.
  • FIG. 4 may be viewed as a generalization of the flow of FIG. 3.
  • the UE such as the UE 202 may be capable of operating in multiple radio access technologies (RATs) including first (e.g., 4G LTE) and second (e.g., 5G NR) RATs.
  • the UE may be in a non-standalone (NSA) mode in FIG. 3.
  • RATs radio access technologies
  • NSA non-standalone
  • the memory component 238 may be viewed as an example of a non-transitory computer-readable medium that stores computer-executable instructions to operate components of the UE 202 such as the transceiver 208 (including transmitter 210 and receiver 212) , the processing system 232 (including one or more processors) , memory component 238, etc.
  • the UE may establish a first radio link between the UE and a first network node of the first RAT.
  • the first radio link may be established or otherwise available for communication between the between the UE and the first network node.
  • Means for performing block 410 may include the processing system 232, the memory component 238 and/or the transceiver 208 of the UE 202.
  • the LTE anchor cell (e.g., LTE eNB) of FIG. 3 may be an example of the first network node.
  • block 410 may correspond to the UE sending the attach request to the LTE anchor cell, and to the LTE anchor cell sending the attach accept to the UE.
  • the first radio link may be used for exchanging control plane data.
  • the first radio link may also be used for exchanging user plane data.
  • the UE may add a second network node of the second RAT as a secondary cell in an SCG.
  • a second radio link may be established between the UE and the secondary network node.
  • the second radio link may be used for exchanging user plane data.
  • Means for performing block 420 may include the processing system 232, the memory component 238 and/or the transceiver 208 of the UE 202.
  • the NR cell (e.g., NR gNB) of FIG. 3 may be an example of the second network node.
  • block 420 may correspond to the UE receiving RRC reconfiguration message to measure NR cells from LTE anchor cell; the UE measuring the NR cells and sending the measurement report to the LTE anchor cell; the UE receiving the RRC reconfiguration message, in which moreThanOneRLC IE is provided, from the LTE anchor cell to setup the SCG; and the UE adding the NR cell to the SCG in accordance with the RRC reconfiguration message and sending the RRC reconfiguration complete response back to the LTE anchor cell.
  • the NR cell may be added as a result of the first network node issuing instructions to the UE to measure for network nodes of the second RAT, the UE measuring and providing the measurement report, the first network node issuing instructions to setup SCG in light of the measurement report, and the UE adding the second network node in the SCG in accordance with the instructions.
  • the secondary radio link may be established or otherwise available for communication between the UE and the secondary network node. That is, the UE may receive data services over the NR link.
  • the UE may store a split bearer configuration, e.g., within the UE.
  • Means for performing block 430 may include the processing system 232, the memory component 238 and/or the transceiver 208 of the UE 202.
  • the stored split bearer configuration may comprise information of a bearer configuration of the second radio link established between the UE and the second network node.
  • the stored split bearer configuration may also comprise information of a bearer configuration of the first radio link established between the UE and the first network node.
  • the stored split bearer configuration may be associated with the first network node.
  • block 430 may correspond to the UE storing copy of the good network split bearer configuration.
  • block 440 may correspond to the UE detecting the RLF, UE sending the RRC connection reestablishment request to the LTE anchor, and the UE receiving the RRC connection reestablishment acknowledgment from the LTE anchor.
  • Means for performing block 440 may include the processing system 232, the memory component 238 and/or the transceiver 208 of the UE 202.
  • the UE in block 450 may add back the second network node in the SCG based on the stored split bearer configuration.
  • Means for performing block 450 may include the processing system 232, the memory component 238 and/or the transceiver 208 of the UE 202.
  • control plane communication between the UE and the network may be interrupted.
  • the user plane communication between the UE and the second network node may also be interrupted.
  • the second radio link is again established or otherwise available for communication between the UE and the second network node after being interrupted.
  • FIG. 5 illustrates a flow chart of an example process that may be performed by the UE to implement block 450.
  • the UE may receive a connection reconfiguration message from the first network node to setup the SCG.
  • a connection configuration may be provided in the connection reconfiguration message.
  • Means for performing block 510 may include the processing system 232, the memory component 238 and/or the transceiver 208 of the UE 202.
  • block 510 may correspond to the UE receiving the RRC reconfiguration message from the LTE anchor cell instructing UE to setup the SCG.
  • the RRC reconfiguration message may be invalid (e.g., may NOT include the moreThanOneRLC IE) .
  • An explanation is as follows.
  • the network will not necessarily have knowledge of a logical channel established between the UE and another cell.
  • the network e.g., through the first network node instructs the UE to conduct measurements for network nodes of the second RAT and report on the measurements again, the network is unlikely to know.
  • the RRC reconfiguration message may not account for the second radio link already established between the UE and the second network node.
  • the UE may determine whether or not the connection configuration is valid or invalid.
  • block 520 may correspond to the UE determining whether a valid configuration is detected.
  • Means for performing block 520 may include the processing system 232, the memory component 238 and/or the transceiver 208 of the UE 202.
  • FIG. 6 illustrates a flow chart of an example process that may be performed by the UE to implement block 520.
  • the UE may determine whether the connection configuration includes the moreThanOne IE. If so (Y branch from block 610) , then in block 620, the UE may determine that the connection configuration is valid. If not (N branch from block 610) , then in block 630, the UE may determine that the connection configuration is invalid.
  • Means for performing blocks 610, 620, and 630 may include the processing system 232 and/or the memory component 238 of the UE 202.
  • FIG. 7 illustrates a flow chart of another example process that may be performed by the UE to implement block 520.
  • FIG. 7 may be viewed as generalization of FIG. 6.
  • the UE may determine whether the connection configuration indicates multiple logical channels. If so (Y branch from block 710) , then in block 720, the UE may determine that the connection configuration is valid. If not (N branch from block 610) , then in block 630, the UE may determine that the connection configuration is invalid.
  • Means for performing blocks 610, 620, and 630 may include the processing system 232 and/or the memory component 238 of the UE 202.
  • block 530 the UE may add the second network node back in the SCG based on the stored split bearer information.
  • block 530 may correspond to the UE using the stored copy of the network split bearer configuration to add the NR cell back in the SCG, and sending the RRC reconfiguration complete response to the LTE anchor.
  • Means for performing block 530 may include the processing system 232, the memory component 238 and/or the transceiver 208 of the UE 202.
  • block 540 the UE may add the second network node back in the SCG in accordance with the connection configuration provided in the connection reconfiguration message from the first network node.
  • block 540 may correspond to the UE processing the RRC reconfiguration message to add the NR cell back in the SCG, and sending the RRC reconfiguration complete response to the LTE anchor.
  • Means for performing block 540 may include the processing system 232, the memory component 238 and/or the transceiver 208 of the UE 202.
  • FIG. 8 illustrates an example user equipment apparatus 800 represented as a series of interrelated functional modules connected by a common bus.
  • Each of the modules may be implemented in hardware or as a combination of hardware and software.
  • the modules may be implemented as any combination of the modules of the apparatus 202 of FIG. 2.
  • a module for establishing the first radio link 810 may correspond at least in some aspects to a communication device (e.g., communication device 208) , a processing system (e.g., processing system 232) and/or a memory component (e.g., memory component 238) .
  • a module for adding the second network node in the SCG 820 may correspond at least in some aspects to a communication device (e.g., communication device 208) , a processing system (e.g., processing system 232) and/or a memory component (e.g., memory component 238) .
  • a module for storing the split bearer configuration 830 may correspond at least in some aspects to a processing system (e.g., processing system 232) and/or a memory component (e.g., memory component 238) .
  • a module for reestablishing the first radio link 840 correspond at least in some aspects to a communication device (e.g., communication device 208) , a processing system (e.g., processing system 232) and/or a memory component (e.g., memory component 238) .
  • a module for adding back the second network node to the SCG 850 may correspond at least in some aspects to a communication device (e.g., communication device 208) , a processing system (e.g., processing system 232) and/or a memory component (e.g., memory component 238) .
  • the functionality of the modules of FIG. 8 may be implemented in various ways consistent with the teachings herein.
  • the functionality of these modules may be implemented as one or more electrical components.
  • the functionality of these blocks may be implemented as a processing system including one or more processor components.
  • the functionality of these modules may be implemented using, for example, at least a portion of one or more integrated circuits (e.g., an ASIC) .
  • an integrated circuit may include a processor, software, other related components, or some combination thereof.
  • the functionality of different modules may be implemented, for example, as different subsets of an integrated circuit, as different subsets of a set of software modules, or a combination thereof.
  • a given subset e.g., of an integrated circuit and/or of a set of software modules
  • FIG. 8 may be implemented using any suitable means. Such means also may be implemented, at least in part, using corresponding structure as taught herein.
  • the components described above in conjunction with the “module for” components of FIG. 8 also may correspond to similarly designated “means for” functionality.
  • one or more of such means may be implemented using one or more of processor components, integrated circuits, or other suitable structure as taught herein.
  • a general purpose processor may be a microprocessor, but in the alternative, the processor may be any conventional 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, a plurality of microprocessors, one or more microprocessors in conjunction with a DSP core, or any other such configuration.
  • a software module may reside in random access memory (RAM) , flash memory, read-only memory (ROM) , erasable programmable ROM (EPROM) , electrically erasable programmable ROM (EEPROM) , registers, hard disk, a removable disk, a CD-ROM, or any other form of storage medium known in the art.
  • An exemplary storage medium is coupled to the processor such that the processor can read information from, and write information to, the storage medium.
  • the storage medium may be integral to the processor.
  • the processor and the storage medium may reside in an ASIC.
  • the ASIC may reside in a user terminal (e.g., UE) .
  • the processor and the storage medium may reside as discrete components in a user terminal.
  • the functions described may be implemented in hardware, software, firmware, or any combination thereof. If implemented in software, the functions may be stored on or transmitted over as one or more instructions or code on a computer-readable medium.
  • Computer-readable media includes both computer storage media and communication media including any medium that facilitates transfer of a computer program from one place to another.
  • a storage media may be any available media that can be accessed by a computer.
  • such computer-readable media can comprise RAM, ROM, EEPROM, CD-ROM or other optical disk storage, magnetic disk storage or other magnetic storage devices, or any other medium that can be used to carry or store desired program code in the form of instructions or data structures and that can be accessed by a computer.
  • any connection is properly termed a computer-readable medium.
  • the software is transmitted from a website, server, or other remote source using a coaxial cable, fiber optic cable, twisted pair, digital subscriber line (DSL) , or wireless technologies such as infrared, radio, and microwave
  • the coaxial cable, fiber optic cable, twisted pair, DSL, or wireless technologies such as infrared, radio, and microwave are included in the definition of medium.
  • Disk and disc includes compact disc (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 should also be included within the scope of computer-readable media.

Abstract

Des techniques pour maintenir une connexion stable de groupe de cellules secondaires (SCG) sont divulguées. Lorsqu'un équipement utilisateur (UE) en mode non autonome (NSA) établit avec succès une première liaison radio avec un premier nœud de réseau d'une première technologie d'accès radio (RAT) et ajoute un second nœud de réseau d'une seconde RAT dans un groupe de cellules secondaires (SCG), l'UE stocke une copie de la configuration de porteuse divisée. Ensuite, lors d'une défaillance sur la première liaison radio, l'UE rétablit la première liaison radio et reçoit une porteuse divisée en provenance du premier nœud de réseau. Si la porteuse divisée provenant du premier nœud de réseau est invalide, l'UE utilise la configuration de porteuse divisée stockée pour rajouter le second nœud de réseau dans le SCG.
PCT/CN2020/094822 2020-06-08 2020-06-08 Connexion stable de groupe de cellules secondaires WO2021248258A1 (fr)

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Citations (3)

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WO2016047904A1 (fr) * 2014-09-25 2016-03-31 Lg Electronics Inc. Procédé de gestion d'émission et de réception de données pour libération de supports liés à des senb au niveau d'un équipement d'utilisateur dans un système à double connectivité et dispositif associé
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