WO2020164070A1 - Changement de cellule primaire - Google Patents

Changement de cellule primaire Download PDF

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Publication number
WO2020164070A1
WO2020164070A1 PCT/CN2019/075114 CN2019075114W WO2020164070A1 WO 2020164070 A1 WO2020164070 A1 WO 2020164070A1 CN 2019075114 W CN2019075114 W CN 2019075114W WO 2020164070 A1 WO2020164070 A1 WO 2020164070A1
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WO
WIPO (PCT)
Prior art keywords
secondary cell
message
cell
switch indication
terminal device
Prior art date
Application number
PCT/CN2019/075114
Other languages
English (en)
Inventor
Chunli Wu
Jing He
Samuli Turtinen
Tero Henttonen
Original Assignee
Nokia Shanghai Bell Co., Ltd.
Nokia Solutions And Networks Oy
Nokia Technologies Oy
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by Nokia Shanghai Bell Co., Ltd., Nokia Solutions And Networks Oy, Nokia Technologies Oy filed Critical Nokia Shanghai Bell Co., Ltd.
Priority to PCT/CN2019/075114 priority Critical patent/WO2020164070A1/fr
Priority to CN201980092244.8A priority patent/CN113455049B/zh
Priority to PCT/CN2019/080258 priority patent/WO2020164177A1/fr
Priority to EP19915492.3A priority patent/EP3925297A4/fr
Publication of WO2020164070A1 publication Critical patent/WO2020164070A1/fr

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    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04W—WIRELESS COMMUNICATION NETWORKS
    • H04W36/00—Hand-off or reselection arrangements
    • H04W36/0005—Control or signalling for completing the hand-off
    • H04W36/0055—Transmission or use of information for re-establishing the radio link
    • H04W36/0061—Transmission or use of information for re-establishing the radio link of neighbour cell information
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
    • H04L5/00—Arrangements affording multiple use of the transmission path
    • H04L5/0001—Arrangements for dividing the transmission path
    • H04L5/0003—Two-dimensional division
    • H04L5/0005—Time-frequency
    • H04L5/0007—Time-frequency the frequencies being orthogonal, e.g. OFDM(A), DMT
    • H04L5/001—Time-frequency the frequencies being orthogonal, e.g. OFDM(A), DMT the frequencies being arranged in component carriers
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
    • H04L5/00—Arrangements affording multiple use of the transmission path
    • H04L5/0091—Signaling for the administration of the divided path
    • H04L5/0094—Indication of how sub-channels of the path are allocated
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
    • H04L5/00—Arrangements affording multiple use of the transmission path
    • H04L5/0091—Signaling for the administration of the divided path
    • H04L5/0096—Indication of changes in allocation
    • H04L5/0098—Signalling of the activation or deactivation of component carriers, subcarriers or frequency bands
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04W—WIRELESS COMMUNICATION NETWORKS
    • H04W36/00—Hand-off or reselection arrangements
    • H04W36/0005—Control or signalling for completing the hand-off
    • H04W36/0055—Transmission or use of information for re-establishing the radio link
    • H04W36/0069—Transmission or use of information for re-establishing the radio link in case of dual connectivity, e.g. decoupled uplink/downlink
    • H04W36/00698—Transmission or use of information for re-establishing the radio link in case of dual connectivity, e.g. decoupled uplink/downlink using different RATs
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04W—WIRELESS COMMUNICATION NETWORKS
    • H04W36/00—Hand-off or reselection arrangements
    • H04W36/08—Reselecting an access point
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04W—WIRELESS COMMUNICATION NETWORKS
    • H04W4/00—Services specially adapted for wireless communication networks; Facilities therefor
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04W—WIRELESS COMMUNICATION NETWORKS
    • H04W4/00—Services specially adapted for wireless communication networks; Facilities therefor
    • H04W4/80—Services using short range communication, e.g. near-field communication [NFC], radio-frequency identification [RFID] or low energy communication

Definitions

  • Example embodiments of the present disclosure generally relate to the field of communications, and in particular, to devices, methods, apparatuses and computer readable storage media of a primary cell change.
  • NR New Radio
  • CA Carrier Aggregation
  • DC Dual Connectivity
  • SA stand-alone
  • NR-U stand-alone NR
  • NR may operate in an unlicensed spectrum as a secondary cell (for example, SCell) in CA, as a primary secondary cell (for example, PSCell) in DC, and as a primary cell (for example, PCell) in stand-alone deployment.
  • SCell secondary cell
  • PSCell primary secondary cell
  • PCell primary cell
  • LBT LTE-Licensed Assisted Access
  • LBT Listen Before Talk
  • Hybrid Automatic Repeat Request (HARQ) feedbacks for Physical Downlink Share Channels (PDSCHs) of SCells need to be sent on a Physical Uplink Control Channel (PUCCH) in a PCell or PSCell (ifnot mapped to PUCCH SCell) .
  • PUCCH Physical Uplink Control Channel
  • a LBT failure in the PCell would block the HARQ feedback for the SCell and therefore impact the throughput even though the SCell is not overloaded.
  • example embodiments of the present disclosure provide devices, methods, apparatuses and computer readable storage media of a primary cell change.
  • a device which comprises at least one processor and at least one memory including computer program code.
  • the at least one memory and the computer program code are configured to, with the at least one processor, cause the device to transmit a set of pre-configurations to a terminal device via a first message.
  • At least one pre-configuration in the set of pre-configurations is associated with a secondary cell in a set of secondary cells and is activated if the associated secondary cell is switched to be a primary cell.
  • the device is further caused to transmit, to the terminal device via a separate second message, a switch indication for switching a secondary cell in the set of secondary cells to be a primary cell.
  • the device is caused to in response to receiving a confirmation for the switching from the terminal device, cause the at least one pre-configuration associated with the secondary cell to be activated.
  • a device which comprises at least one processor and at least one memory including computer program code.
  • the at least one memory and the computer program code are configured to, with the at least one processor, cause the device to receive a set of pre-configurations from a network device via a first message.
  • At least one pre-configuration in the set of pre-configurations is associated with a secondary cell in a set of secondary cells and is activated if the associated secondary cell is switched to be a primary cell.
  • the device is further caused to receive, from the network device via a separate second message, a switch indication for switching a secondary cell in the set of secondary cells to be a primary cell and transmit a confirmation for the switching to the network device.
  • a network device transmits a set of pre-configurations to a terminal device via a first message. At least one pre-configuration in the set of at least one pre-configuration is associated with a secondary cell in a set of secondary cells and is activated if the associated secondary cell is switched to be a primary cell.
  • the network device transmits, to the terminal device via a separate second message, a switch indication for switching a secondary cell in the set of secondary cells to be a primary cell.
  • the network device causes the at least one pre-configuration associated with the secondary cell to be activated.
  • a terminal device receives a set of pre-configurations from a network device via a first message. At least one pre-configuration in the set of at least one pre-configuration is associated with a secondary cell in a set of secondary cells and is activated if the associated secondary cell is switched to be a primary cell.
  • the terminal device receives, from the network device via a separate second message, a switch indication for switching a secondary cell in the set of secondary cells to be a primary cell and transmits a confirmation for the switching to the network device.
  • an apparatus comprising means for performing the method according to the third or fourth aspect.
  • a computer readable storage medium comprising program instructions stored thereon. The instructions, when executed by a processor of a device, cause the device to perform the method according to the third or fourth aspect.
  • FIG. 1 illustrates an example scenario in which some example embodiments of the present disclosure can be implemented
  • FIG. 2 illustrates a signaling flow between a network device and a terminal device for a primary cell switch according to some example embodiments of the present disclosure
  • FIG. 3 illustrates a flowchart of an example method according to some example embodiments of the present disclosure
  • FIG. 4 illustrates a flowchart of an example method according to some other example embodiments of the present disclosure.
  • FIG. 5 illustrates a simplified block diagram of a device that is suitable for implementing example embodiments of the present disclosure.
  • terminal device or “user equipment” (UE) refers to any terminal device capable of wireless communications with each other or with the base station.
  • the communications may involve transmitting and/or receiving wireless signals using electromagnetic signals, radio waves, infrared signals, and/or other types of signals suitable for conveying information over air.
  • the UE may be configured to transmit and/or receive information without direct human interaction. For example, the UE may transmit information to the network device on predetermined schedules, when triggered by an internal or external event, or in response to requests from the network side.
  • Examples of the UE include, but are not limited to, user equipment (UE) such as smart phones, wireless-enabled tablet computers, laptop-embedded equipment (LEE) , laptop-mounted equipment (LME) , wireless customer-premises equipment (CPE) , sensors, metering devices, personal wearables such as watches etc., and/or vehicles that are capable of communication.
  • UE user equipment
  • LME laptop-embedded equipment
  • LME laptop-mounted equipment
  • CPE wireless customer-premises equipment
  • sensors metering devices
  • personal wearables such as watches etc.
  • vehicles that are capable of communication.
  • network device refers to a device via which services can be provided to a terminal device in a communication network.
  • the network device may comprise an access network device and a core network device.
  • the access network device may comprise any suitable device via which a terminal device or UE can access the communication network.
  • Examples of the access network devices include a relay, an access point (AP) , a transmission point (TRP) , a node B (NodeB or NB) , an evolved NodeB (eNodeB or eNB) , a New Radio (NR) NodeB (gNB) , a Remote Radio Module (RRU) , a radio header (RH) , a remote radio head (RRH) , a low power node such as a femto, a pico, and the like.
  • AP access point
  • TRP transmission point
  • NodeB or NB node B
  • eNodeB or eNB evolved NodeB
  • gNB New Radio
  • RRU Remote Radio Module
  • RH radio header
  • RRH remote radio head
  • a low power node such as a femto, a pico, and the like.
  • the core network device may comprise any suitable device capable of communicating with the access network device and providing services to the terminal device in a core network.
  • Examples of the core network device may include Mobile Switching Centers (MSCs) , MMEs, Operation and Management (O&M) nodes, Operation Support System (OSS) nodes, Self-Organization Network (SON) nodes, positioning nodes, such as Enhanced Serving Mobile Location Centers (E-SMLCs) , Mobile Data Terminals (MDTs) , Common Control Network Function (CCNF) , Access and mobility Management Function (AMF) , and/or Network Slice Selection Function (NSSF) .
  • MSCs Mobile Switching Centers
  • O&M Operation and Management
  • OSS Operation Support System
  • SON Self-Organization Network
  • E-SMLCs Enhanced Serving Mobile Location Centers
  • MDTs Mobile Data Terminals
  • CCNF Common Control Network Function
  • AMF Access and mobility Management Function
  • NSSF Network Slice Selection Function
  • the term “primary cell” or “master cell” refers to a cell of a plurality of serving cells for a terminal device that operates on a dominant cartier and supports cell configuration, cell activation and cell setup of the terminal device.
  • the primary cell may comprise a PCell in a master cell group (MCG) or a PSCell in secondary cell group (SCG) .
  • MCG master cell group
  • SCG secondary cell group
  • the terms “primary cell” or “master cell” may be used interchangeably in the context of the present disclosure.
  • secondary cell refers to a cell of the serving cells for a terminal device that operates on a secondary carrier and assists the primary cell in providing additional services to the terminal device.
  • the secondary cell may comprise a SCell.
  • circuitry may refer to one or more or all of the following:
  • combinations of hardware circuits and software such as (as applicable) : (i) a combination of analog and/or digital hardware circuit (s) with software/firmware and (ii) any portions of hardware processor (s) with software (including digital signal processor (s) ) , software, and memory (ies) that work together to cause an apparatus, such as a mobile phone or server, to perform various functions) and
  • circuitry also covers an implementation of merely a hardware circuit or processor (or multiple processors) or portion of a hardware circuit or processor and its (or their) accompanying software and/or firmware.
  • circuitry also covers, for example and if applicable to the particular claim element, a baseband integrated circuit or processor integrated circuit for a mobile device or a similar integrated circuit in a server, a cellular network device, or other computing or network device.
  • first As used herein, the terms “first” , “second” and the like may be used herein to describe various elements, these elements should not be limited by these terms. These terms are only used to distinguish one element from another. For example, a first element could be referred to as a second element, and similarly, a second element could be termed a first element, without departing from the scope of example embodiments. As used herein, the term “and/or” includes any and all combinations of one or more of the listed terms.
  • the unlicensed spectrum may be applied in many scenarios for in 5G NR. For example, the following scenarios are covered:
  • ⁇ Scenario A Carrier aggregation (CA) between licensed band NR (Primary cell or PCell) and NR-U (Secondary Cell or SCell) .
  • CA Carrier aggregation
  • ⁇ NR-U SCell may have both Downlink (DL) and Uplink (UL) , or DL-only.
  • NR PCell is connected to 5G Core Network (5G-CN) .
  • 5G-CN 5G Core Network
  • ⁇ Scenario B Dual connectivity (DC) between licensed band Long Term Evolution (LTE) (PCell) and NR-U (PSCell)
  • DC Dual connectivity between licensed band Long Term Evolution (LTE) (PCell) and NR-U (PSCell)
  • LTE PCell connected to Evolved Packet Core has a higher priority than PCell connected to 5G-CN.
  • NR-U is connected to 5G-CN.
  • ⁇ Scenario D A stand-alone NR cell in an unlicensed band and UL in a licensed band (single cell architecture)
  • NR-U is connected to 5G-CN.
  • ⁇ Scenario E Dual connectivity between licensed band NR and NR-U
  • PCell is connected to 5G-CN, which may be treated with a lower priority.
  • NR may be allowed to operate in the unlicensed spectrum, for example, in CA with a licensed band NR cartier (s) , in DC with LTE or NR in a licensed band, in stand-alone (SA) with DL and UL in an unlicensed band, and in SA with DL in an unlicensed band and UL in a licensed band.
  • NR cartier s
  • SA stand-alone
  • the baseline assumption is that the NR-U operating bandwidth is an integer multiple of 20MHz.
  • a bandwidth larger than 20 MHz can be supported with multiple serving cells.
  • NR-U should support that a serving cell can be configured with a bandwidth larger than 20 MHz.
  • the agreed SA and DC scenarios in NR-U supports the CA of PCell (in an unlicensed band) + SCells (in an unlicensed band) and the CA of PSCell (in an unlicensed band) + SCells (in an unlicensed band) .
  • HARQ feedbacks for PDSCHs of SCells need to be sent on a PUCCH in a PCell or PSCell (if not mapped to PUCCH SCell) .
  • the loads could be different on different carriers, and LBT cannot always be successful on the unlicensed carriers of a PCell or PSCell together with one or more unlicensed carriers of configured SCells. In this case, an LBT failure in the PCell would block the HARQ feedback for the SCell and therefore impact the throughput even though the SCell is not overloaded.
  • a conventional approach is handover (HO) via Radio Resource Control (RRC) Reconfiguration with synchronization (sync) to change one available SCell to be a PCell or PSCell.
  • RRC Radio Resource Control
  • Snc Radio Resource Control
  • UE may perform RRC connection reestablishment to select one SCell to be the PCell when the original PCell is failed.
  • a HO procedure is slow, and thus may not meet performance requirements, especially in a NR-U system.
  • NR-U a time for occupying an unlicensed carrier upon an LBT success is limited by regulatory. The inventors notice that it may be needed to minimize an interruption time for a SCell when the SCell is not overloaded while the PCell is not available anymore.
  • Example embodiments of the present disclosure provide a fast primary cell (for example, a PCell or PSCell) change or switch in NR-U CA and dual connectivity (DC) , for example.
  • a set of secondary cells are preconfigured as potential primary cells with necessary pre-configurations that can be used when a secondary cell is switched to be a primary cell.
  • a network device indicates the pre-configurations (such as resources, timers, security keys and the like) for the secondary cells to a terminal device.
  • the pre-configurations may be stored at both the network device and the terminal device and activated when a fast primary cell change is enforced.
  • the network device When it is determined to switch a secondary cell of the secondary cells to be a primary cell, the network device transmits a switch indication to the terminal device. If the network device receives a confirmation for the switching from the terminal device, the network device can cause the at least one pre-configuration associated with the secondary cell to be activated to switch the secondary cell to be the primary cell.
  • a primary cell for example, a PCell or PSCell
  • a secondary cell for example, a SCell
  • transmission delay may be reduced without User Plane (UP) interruption.
  • the fast primary cell change/switch according to example embodiments of the present disclosure is relevant to both the unlicensed and licensed bands for DC and CA for the low latency and fast recovery objectives as below:
  • Multi-RAT DC Multiple Radio Access Technology
  • MR-DC Multiple Radio Access Technology
  • NR-NR DC NR-NR DC
  • CA Multiple Radio Access Technology
  • ⁇ Fast recovery supporting fast recovery of a master cell group (MCG) link, for example, by utilizing a secondary cell group (SCG) link and splitting signaling radio bearers (SRBs) for recovery during MCG failure while operating under MR-DC
  • MCG master cell group
  • SCG secondary cell group
  • SRBs splitting signaling radio bearers
  • FIG. 1 shows an example environment 100 in which example embodiments of the present disclosure can be implemented.
  • the environment 100 which may be a part of a communication network, comprises a network device 105 and a terminal device 110. It is to be understood that one network device and one terminal device are shown in the environment 100 only for the purpose of illustration, without suggesting any limitation to the scope of the present disclosure. Any suitable number of network devices and terminal devices may be included in the environment 100.
  • the network device 105 can provide a primary cell 115 and two secondary cells 120-1 and 120-2 (collectively or individually referred to as a secondary cell 120) as serving cells for the terminal device 110.
  • the primary cell 115 and the secondary cell 120 operate on different carriers.
  • the serving cells for the terminal device 110 may comprise any suitable number of secondary cells. It is also to be understood that the serving cells are serviced or provided by one network device only for the purpose of illustration without suggesting any limitations.
  • the serving cells may be serviced by any suitable number of network devices. For example, it may be possible that the primary cell 115 is serviced by a network device, and the secondary cells 120 are serviced by one or more further network devices. As another example, the primary cell 115 and one secondary cell 120-1 are served by one network device, and the other secondary cell 120-2 is served by another network device.
  • the terminal device 110 can communicate with the network device 105 or with another terminal device (not shown) directly or via the network device 105.
  • the communication may follow any suitable communication standards or protocols such as Universal Mobile Telecommunications System (UMTS) , long term evolution (LTE) , LTE-Advanced (LTE-A) , the fifth generation (5G) NR, Wireless Fidelity (Wi-Fi) and Worldwide Interoperability for Microwave Access (WiMAX) standards, and employs any suitable communication technologies, including, for example, Multiple-Input Multiple-Output (MIMO) , Orthogonal Frequency Division Multiplexing (OFDM) , time division multiplexing (TDM) , frequency division multiplexing (FDM) , code division multiplexing (CDM) , Bluetooth, ZigBee, and machine type communication (MTC) , enhanced mobile broadband (eMBB) , massive machine type communication (mMTC) , ultra-reliable low latency communication (URLLC) , Cartier Aggregation (CA)
  • the secondary cells 120 are preconfigured to be potential primary cells which can be switched to be a primary cell.
  • the network device 105 indicates to the terminal device 110 pre-configurations for the secondary cells for use when the switching is enabled.
  • the network device 105 decides to switch a secondary cell 120 to be a primary cell, the network device 105 transmits a switch indication to the terminal device 110. The switching is caused by the network device 105 after a confirmation is received from the terminal device 110.
  • FIG. 2 illustrates a signaling flow 200 between the network device 105 and the terminal device 110 in a fast primary cell change/switch in accordance with some example embodiments of the present disclosure.
  • the network device 105 transmits (205) a set of pre-configurations to the terminal device 110 via a message (referred to as a first message) .
  • a message referred to as a first message
  • At least one pre-configuration in the set of pre-configurations is associated with a secondary cell 120.
  • the at least one pre-configuration can be activated when the associated secondary cell is switched as a primary cell.
  • the at least one pre-configuration may include any suitable types of configurations for use when the associated secondary cell is switched to be a primary cell.
  • Examples of the pre-configuration may include resource allocation such as a PUCCH resource for a HARQ feedback or a scheduling request (SR) , a Physical Random Access Channel (PRACH) resource, a common search space (CSS) , and any other time, frequency, code and space resources.
  • the pre-configuration may also include timers, a security key and the like for use in the associated secondary cell when the secondary cell is switched to be a primary cell.
  • the pre-configurations may be indicated by the network device 105 to the terminal device 110 in the primary cell 115 or the secondary cell 120.
  • the pre-configurations may be indicated by any one or more of the serving network devices in any one or more serving cells.
  • the first message may be any suitable message, including, for example, a Radio Resource Control (RRC) message, a Media Access Control (MAC) message and a Physical (PHY) layer message.
  • RRC Radio Resource Control
  • MAC Media Access Control
  • PHY Physical
  • the network device 105 may send the pre-configurations to the terminal device 110 in the signaling message dedicated to the terminal device 110, such as Radio Resource Control (RRC) signaling or a media access control (MAC) control element (CE) .
  • RRC Radio Resource Control
  • MAC media access control
  • CE media access control
  • system information such as a system information block (SIB) .
  • SIB system information block
  • the network device 105 transmits (210) a switch indication for the switching to the terminal device 110 via a message (referred to as a second message) separate from the first message.
  • the primary cell switch may be triggered at the network device 105 in response to a DL LBT failure.
  • the network device 105 may select a secondary cell to be switched upon a DL LBT failure in the primary cell 115.
  • a threshold about the number of DL LBT failures may be set to avoid excessively frequent primary cell switching. For example, when continuous LBT failures occur for N (where N represents a positive integer) times in the primary cell 115, the network device 105 may determine the switching.
  • the primary cell switch may also be triggered in response to a UL LBT failure.
  • the terminal device 110 may send a request for primary cell switch to change the primary cell 115 upon detection of one or more UL LBT failure.
  • the request may be sent by the terminal device 110 through a MAC CE, for example.
  • the network device 105 may trigger the switching.
  • the primary cell switch may be triggered by a master network device providing the current primary cell.
  • the further network device may send an indication of a DL LBT failure in the primary cell to the network device 105 for example via a X2 interface between the two network devices to trigger the primary cell switch.
  • the primary cell switch is done by the network device serving the corresponding primary cell. For example, a master node sends a switch indication for PCell, and a secondary node sends a switch indication for PSCell.
  • the second message may comprise any suitable message, including a MAC message and a PHY layer message, for example.
  • the switch indication may be sent in the MAC CE to further expedite the primary cell change.
  • authentication information may be included in the MAC CE, which may comprise Message Authentication Code-Integrity (MAC-I) or MAC-I2, for example.
  • MAC-I Message Authentication Code-Integrity
  • the terminal device 110 may check the integrity of the MAC CE to avoid network attacking.
  • the second message comprises a Physical Downlink Control Channel (PDCCH) order which initiates a random access procedure on the secondary cell to be switched as a primary cell.
  • the switch indication may be sent in the PDCCH order.
  • the PDCCH order may include a new field for carrying the switch indication.
  • an existing field in the PDCCH order may be assigned to a new value to indicate the switching.
  • Other implementations of using the PDCCH order to indicate the switching are possible. The scope of the present disclosure is not limited in this regard.
  • the switch indication may identify the secondary cell 120 to be switched in any suitable way.
  • the MAC CE or the PDCCH order may be transmitted by the network device 105 to the terminal device 110 in the secondary cell 120 to be switched or changed.
  • the terminal device 120 may determine that the secondary cell 120 is to be switched as a primary cell. That is, the secondary cell from which the switch indication is received is considered as the secondary cell to be switched implicitly.
  • the MAC CE or the PDCCH order may be scheduled by the network device 105 across carriers in another secondary cell with a cell identification (such as a cell index or cell identifier) pointing to the secondary cell to be switched to be a primary cell.
  • the network device 105 may transmit the switch indication via a further secondary cell to the terminal device, the switch indication includes a cell identification for the secondary cell to switch the secondary cell indicated by the cell identification to be the primary cell.
  • the cell index or cell identifier may be needed when more than one secondary cell is pre-configured as potential primary cells and it is cross-scheduled.
  • the network device 105 After transmitting (210) the switch indication, the network device 105 receives (215) a confirmation for the switching from the terminal device 110.
  • the confirmation may be received from the terminal device 110 by using the at least one pre-configuration associated with the secondary cell to be switched or changed.
  • the terminal device 110 may transmit a HARQ feedback, such as an acknowledgement (ACK) , for the MAC CE using the PUCCH resource as the confirmation for the switching of the secondary cell.
  • ACK acknowledgement
  • the network device 105 Upon reception of the HARQ feedback, the network device 105 knows that the switching is confirmed by the terminal device 120.
  • the terminal device 110 may send a random access request using the PRACH resource as the confirmation for the switching of the secondary cell.
  • the confirmation from the terminal device 110 may be implemented using a random access (RA) procedure performed in the secondary cell to be switched as a new primary cell.
  • the random access request may include a random access preamble.
  • the switch indication sent by the network device 105 may contain a dedicated preamble for the RA procedure to indicate that the terminal device 110 can use the dedicated preamble to initiate the RA procedure to confirm the primary cell switch or change.
  • a message 3 (Msg3) in the RA procedure associated with the pre-configuration from the terminal device 110 may serve as the confirmation.
  • the network device 105 After receiving (215) the confirmation from the terminal device 110, the network device 105 causes (220) the at least one pre-configuration to be activated to switch the associated secondary cell to be the primary cell. For example, if the terminal device 110 uses a RA procedure for the confirmation, upon reception of the random access request from the terminal device 110, the switching of the secondary cell to a primary cell may be caused at the network device 105. In some example embodiments, the switching of the secondary cell to a primary cell may be caused at the network device 105 upon the completion of the RA procedure, upon reception of a Msg3 message or after a random access response is sent by the network device 105.
  • the terminal device 110 may apply the at least one pre-configuration associated with the secondary cell for communication at initiation of the RA procedure.
  • the pre-configuration related to the RA procedure (such as a resource, timers and the like) may be applied by the terminal device 110 upon the initiation of the RA procedure. It is also possible that some other pre-configurations are applied upon the initiation of the RA procedure.
  • the terminal device 110 may apply the at least one pre-configuration associated with the secondary cell for communication after receiving a random access response from the network device 105 or upon the completion of the RA procedure or reception of Message 4 (Msg4) from the network device 105.
  • Msg4 Message 4
  • the network device 105 may activate the pre-configuration associated with the secondary cell.
  • the network device 105 sends an activation indication to the further network device for example via a X2 interface to cause the further network device to activate the pre-configuration associated with the secondary cell.
  • the at least one pre-configuration may comprise a security key preconfigured for a secondary cell 120 and enabled after the secondary cell 120 is switched to be a new primary cell in order to ensure the communication security.
  • the terminal device 110 may suspend Layer 2 (L2) reception after the PDCCH order or MAC CE, and then resumed with the new key after the RACH completion or HARQ ACK. It is also possible that the key is not changed during the switching of a secondary cell to a primary cell.
  • L2 Layer 2
  • FIG. 3 shows a flowchart of an example method 300 according to some example embodiments of the present disclosure.
  • the method 300 can be implemented by the network device 105 as shown in FIG. 1. For the purpose of discussion, the method 300 will be described with reference to FIG. 1.
  • the network device 105 transmits a set of pre-configurations to the terminal device 110 via a first message. At least one pre-configuration in the set of pre-configurations is associated with a secondary cell in a set of secondary cells, and is activated if the associated secondary cell is switched to be a primary cell.
  • the network device 105 transmits, to the terminal device 110 via a separate second message, a switch indication for switching a secondary cell in the set of secondary cells to be a primary cell.
  • the network device 105 in response to receiving a confirmation for the switching from the terminal device 110, causes the at least one pre-configuration associated with the secondary cell to be activated.
  • the first message comprises a signaling message dedicated to the terminal device.
  • the network device 105 transmits the set of pre-configurations in the signaling message dedicated to the terminal device 110.
  • the second message comprises a media access control (MAC) control element (CE) .
  • the network device 105 transmits the switch indication in the MAC CE.
  • the MAC CE may include authentication information such as Message Authentication Code-Integrity (MAC-I) .
  • the second message comprises a Physical Downlink Control Channel (PDCCH) order.
  • the network device 105 transmits the switch indication in the PDCCH order.
  • the PDCCH order may include a field for carrying the switch indication.
  • the secondary cell is served by the network device 105.
  • the network device 105 receives the confirmation from the terminal device 110 by using the at least one pre-configuration associated with the secondary cell.
  • the network device 105 may receive a hybrid automatic repeat request (HARQ) feedback for the MAC CE as the confirmation from the terminal device using the PUCCH resource.
  • MAC media access control
  • CE control element
  • PUCCH Physical Uplink Control Channel
  • the network device 105 may receive a random access request as the confirmation from the terminal device in using PRACH resource.
  • the switch indication may include a dedicated preamble for the random access request.
  • the network device 105 after receiving the random access request from the terminal device 110, the network device 105 transmits a random access response to the terminal device 110. Further, the network device 105 activates the at least one pre-configuration associated with the secondary cell. In some other example embodiments, the network device 105 may activate the at least one pre-configuration associated with the secondary cell upon completion of a random access procedure initiated by the terminal device 110 using the random access request.
  • the network device 105 may transmit the switch indication via the second message in the secondary cell to indicate that the secondary cell is to be switched to be a primary cell.
  • the network device 105 may select the secondary cell from the set of secondary cells to be switched to be the primary cell in response to at least one of a downlink listen before talk (LBT) failure in a current primary cell and a request for primary cell switch from the terminal device 110.
  • LBT downlink listen before talk
  • a further secondary cell in the set of the secondary cells is served by the network device 105.
  • the network device 105 may transmit the switch indication via the second message in the further secondary cell to the terminal device 110, and the switch indication includes a cell identification for the secondary cell to switch the secondary cell indicated by the cell identification to be the primary cell.
  • the secondary cell is served by a further network device.
  • the network device 105 may send an activation indication to the further network device to activate the at least one pre-configuration associated with the secondary cell.
  • the at least one pre-configuration comprises configurations necessary for a cell to serve as a primary cell.
  • the at least one pre-configuration may comprise at least one of a security key for communication in the secondary cell, a Physical Uplink Control Channel (PUCCH) resource for a hybrid automatic repeat request (HARQ) feedback or a scheduling request (SR) , a Physical Random Access Channel (PRACH) resource, a common search space (CSS) , and at least one timer.
  • PUCCH Physical Uplink Control Channel
  • HARQ hybrid automatic repeat request
  • SR scheduling request
  • PRACH Physical Random Access Channel
  • SCS common search space
  • the first message may comprise one of a Radio Resource Control (RRC) message, a Media Access Control (MAC) message and a Physical (PHY) layer message
  • the second message may comprise one of a MAC message and a PHY layer message.
  • RRC Radio Resource Control
  • MAC Media Access Control
  • PHY Physical
  • FIG. 4 shows a flowchart of an example method 400 according to some example embodiments of the present disclosure.
  • the method 400 can be implemented by the terminal device 110 as shown in FIG. 1.
  • the method 400 will be described with reference to FIG. 1.
  • the terminal device 110 receives a set of pre-configurations from the network device 105 via a first message. At least one pre-configuration in the set of pre-configurations is associated with a secondary cell in a set of secondary cells and is activated if the associated secondary cell is switched to be a primary cell.
  • the terminal device 110 receives, from the network device 105 via a separate second message, a switch indication for switching a secondary cell in the set of secondary cells to be a primary cell.
  • the terminal device 110 transmits a continuation for the switching to the network device 105.
  • the terminal device 110 may receive a random access response from the network device. Then, the terminal device 110 may apply the at least one pre-configuration associated with the secondary cell for communication. In some example embodiments, the terminal device 110 may apply the at least one pre-configuration associated with the secondary cell for communication upon completion of a random access procedure initiated using the random access request. In some other example embodiments, the terminal device 110 may apply the at least one pre-configuration associated with the secondary cell for communication upon initiation of the random access procedure.
  • the terminal device 110 may transmit a request for primary cell switch to the network device.
  • the methods 300 and 400 described above with reference to FIGS. 1-4 may be performed by an apparatus comprising means for performing the respective steps of the methods 300 and 400.
  • the means may be implemented in any suitable form.
  • the means may be implemented in a circuitry or software module.
  • FIG. 5 is a simplified block diagram of a device 500 that is suitable for implementing example embodiments of the present disclosure.
  • the device 500 can be implemented at or as a part of the network device 105 or the terminal device 110 as shown in FIG. 1.
  • the device 500 includes a processor 510, a memory 520 coupled to the processor 510, a communication module 530 coupled to the processor 510, and a communication interface (not shown) coupled to the communication module 530.
  • the memory 520 stores at least a program 540.
  • the communication module 530 is for bidirectional communications, for example, via multiple antennas.
  • the communication interface may represent any interface that is necessary for communication.
  • the program 540 is assumed to include program instructions that, when executed by the associated processor 510, enable the device 500 to operate in accordance with the example embodiments of the present disclosure, as discussed herein with reference to FIGS. 1-4.
  • the example embodiments herein may be implemented by computer software executable by the processor 510 of the device 500, or by hardware, or by a combination of software and hardware.
  • the processor 510 may be configured to implement various example embodiments of the present disclosure.
  • the memory 520 may be of any type suitable to the local technical network and may be implemented using any suitable data storage technology, such as a non-transitory computer readable storage medium, semiconductor based memory devices, magnetic memory devices and systems, optical memory devices and systems, fixed memory and removable memory, as non-limiting examples. While only one memory 520 is shown in the device 500, there may be several physically distinct memory modules in the device 500.
  • the processor 510 may be of any type suitable to the local technical network, and may include one or more of general purpose computers, special purpose computers, microprocessors, digital signal processors (DSPs) and processors based on multicore processor architecture, as non-limiting examples.
  • the device 500 may have multiple processors, such as an application specific integrated circuit chip that is slaved in time to a clock which synchronizes the main processor.
  • the processor 510 and the communication module 530 may cooperate to implement the method 300 as described above with reference to FIG. 3.
  • the processor 510 and the communication module 530 may cooperate to implement the method 400 as described above with reference to FIG. 4.
  • various example embodiments of the present disclosure may be implemented in hardware or special purpose circuits, software, logic or any combination thereof. Some aspects may be implemented in hardware, while other aspects may be implemented in firmware or software which may be executed by a controller, microprocessor or other computing device. While various aspects of example embodiments of the present disclosure are illustrated and described as block diagrams, flowcharts, or using some other pictorial representations, it is to be understood that the block, apparatus, system, technique or method described herein may be implemented in, as non-limiting examples, hardware, software, firmware, special purpose circuits or logic, general purpose hardware or controller or other computing devices, or some combination thereof.
  • the present disclosure also provides at least one computer program product tangibly stored on a non-transitory computer readable storage medium.
  • the computer program product includes computer-executable instructions, such as those included in program modules, being executed in a device on a target real or virtual processor, to carry out the methods 300 and 400 as described above with reference to FIGS. 1-4.
  • program modules include routines, programs, libraries, objects, classes, components, data structures, or the like that perform particular tasks or implement particular abstract data types.
  • the functionality of the program modules may be combined or split between program modules as desired in various example embodiments.
  • Machine-executable instructions for program modules may be executed within a local or distributed device. In a distributed device, program modules may be located in both local and remote storage media.
  • Program code for carrying out methods of the present disclosure may be written in any combination of one or more programming languages. These program codes may be provided to a processor or controller of a general purpose computer, special purpose computer, or other programmable data processing apparatus, such that the program codes, when executed by the processor or controller, cause the functions/operations specified in the flowcharts and/or block diagrams to be implemented.
  • the program code may execute entirely on a machine, partly on the machine, as a stand-alone software package, partly on the machine and partly on a remote machine or entirely on the remote machine or server.
  • the computer program codes or related data may be carried by any suitable carrier to enable the device, apparatus or processor to perform various processes and operations as described above.
  • Examples of the carrier include a signal, computer readable media.
  • the computer readable medium may be a computer readable signal medium or a computer readable storage medium.
  • a computer readable medium may include but not limited to an electronic, magnetic, optical, electromagnetic, infrared, or semiconductor system, apparatus, or device, or any suitable combination of the foregoing.
  • the computer readable storage medium would include an electrical connection having one or more wires, a portable computer diskette, a hard disk, a random access memory (RAM) , a read-only memory (ROM) , an erasable programmable read-only memory (EPROM or Flash memory) , an optical fiber, a portable compact disc read-only memory (CD-ROM) , Digital Versatile Disc (DVD) , an optical storage device, a magnetic storage device, or any suitable combination of the foregoing.
  • RAM random access memory
  • ROM read-only memory
  • EPROM or Flash memory erasable programmable read-only memory
  • CD-ROM compact disc read-only memory
  • DVD Digital Versatile Disc
  • an optical storage device a magnetic storage device, or any suitable combination of the foregoing.
  • Example 1 a device comprising: at least one processor; and at least one memory including computer program code; the at least one memory and the computer program code configured to, with the at least one processor, cause the device to: transmit a set of pre-configurations to a terminal device via a first message, at least one pre-configuration in the set of pre-configurations being associated with a secondary cell in a set of secondary cells and being activated if the associated secondary cell is switched to be a primary cell; transmit, to the terminal device via a separate second message, a switch indication for switching a secondary cell in the set of secondary cells to be a primary cell; and in response to receiving a confirmation for the switching from the terminal device, cause the at least one pre-configuration associated with the secondary cell to be activated.
  • Example 2 the device of example 1, wherein the first message comprises a signaling message dedicated to the terminal device, and the device is caused to transmit the set of pre-configurations by: transmitting the set of pre-configurations in the signaling message dedicated to the terminal device.
  • Example 3 the device of example 1, wherein the second message comprises a media access control (MAC) control element (CE) , and the device is caused to transmit the switch indication by: transmitting the switch indication in the MAC CE.
  • MAC media access control
  • CE control element
  • Example4 the device of example 3, wherein the MAC CE includes authentication information.
  • Example 5 the device of example 4, wherein the authentication information comprises Message Authentication Code-Integrity (MAC-I) .
  • MAC-I Message Authentication Code-Integrity
  • Example 6 the device of example 1, wherein the second message comprises a Physical Downlink Control Channel (PDCCH) order, and the device is caused to transmit the switch indication by: transmitting the switch indication in the PDCCH order.
  • PDCCH Physical Downlink Control Channel
  • Example 7 the device of example 6, wherein the PDCCH order includes a field for carrying the switch indication.
  • Example 8 the device of example 1, wherein the secondary cell is served by the device.
  • Example 9 the device of example 8, wherein the device is caused to receive the confirmation by: receiving the confirmation from the terminal device by using the at least one pre-configuration associated with the secondary cell.
  • Example 10 the device of example 9, wherein the second message comprises a media access control (MAC) control element (CE) , the at least one pre-configuration associated with the secondary cell comprises a Physical Uplink Control Channel (PUCCH) resource in the secondary cell, and the device is caused to receive the confirmation by: receiving a hybrid automatic repeat request (HARQ) feedback for the MAC CE as the confirmation from the terminal device using the PUCCH resource.
  • MAC media access control
  • CE media access control element
  • PUCCH Physical Uplink Control Channel
  • Example 11 the device of example 9, wherein the at least one pre-configuration associated with the secondary cell comprises a Physical Random Access Channel (PRACH) resource in the secondary cell, and the device is caused to receive the confirmation by: receiving a random access request as the confirmation from the terminal device using the PRACH resource.
  • PRACH Physical Random Access Channel
  • Example 12 the device of example 11, wherein the switch indication includes a dedicated preamble for the random access request.
  • Example 13 the device of example 11, wherein the device causes the at least one pre-configuration associated with the secondary cell to be activated by: in response to receiving the random access request, transmitting a random access response to the terminal device; and activating the at least one pre-configuration associated with the secondary cell.
  • Example 14 the device of example 11, wherein the device causes the at least one pre-configuration associated with the secondary cell to be activated by: activating the at least one pre-configuration associated with the secondary cell upon completion of a random access procedure initiated by the terminal device using the random access request.
  • Example 15 the device of example 8, wherein the device is caused to transmit the switch indication by: transmitting, to the terminal device via the second message, the switch indication in the secondary cell to indicate that the secondary cell is to be switched to be a primary cell.
  • Example 16 the device of example 8, wherein the device is further caused to: select the secondary cell from the set of secondary cells to be switched to be the primary cell in response to at least one of a downlink listen before talk (LBT) failure in a current primary cell and a request for primary cell switch from the terminal device.
  • LBT downlink listen before talk
  • Example 17 the device of example 1, wherein a further secondary cell in the set of the secondary cells is served by the device, and the device is caused to transmit the switch indication by: transmitting, to the terminal device via the second message in the further secondary cell, the switch indication including a cell identification for the secondary cell to switch the secondary cell indicated by the cell identification to be the primary cell.
  • Example 18 the device of example 1, wherein the secondary cell is served by a further device, and the device causes the at least one pre-configuration associated with the secondary cell to be activated by: sending an activation indication to the further device to activate the at least one pre-configuration associated with the secondary cell.
  • Example l9 the device of example 1, wherein the at least one pre-configuration associated with the secondary cell comprises at least one of: a security key for communication in the secondary cell, a Physical Uplink Control Channel (PUCCH) resource for a hybrid automatic repeat request (HARQ) feedback or a scheduling request (SR) , a Physical Random Access Channel (PRACH) resource, a common search space (CSS) , and at least one timer.
  • a security key for communication in the secondary cell a Physical Uplink Control Channel (PUCCH) resource for a hybrid automatic repeat request (HARQ) feedback or a scheduling request (SR) , a Physical Random Access Channel (PRACH) resource, a common search space (CSS) , and at least one timer.
  • PUCCH Physical Uplink Control Channel
  • HARQ hybrid automatic repeat request
  • SR scheduling request
  • PRACH Physical Random Access Channel
  • SCS common search space
  • Example 20 the device of example 1, wherein the first message comprises one of a Radio Resource Control (RRC) message, a Media Access Control (MAC) message and a Physical (PHY) layer message, and the second message comprises one of a MAC message and a PHY layer message.
  • RRC Radio Resource Control
  • MAC Media Access Control
  • PHY Physical
  • Example 21 a device comprising: at least one processor; and at least one memory including computer program code; the at least one memory and the computer program code configured to, with the at least one processor, cause the device to: receive a set of pre-configurations from a network device via a first message, at least one pre-configuration in the set of at least one pre-configuration being associated with a secondary cell in a set of secondary cells and being activated if the associated secondary cell is switched to be a primary cell; receive, from the network device via a separate second message, a switch indication for switching a secondary cell in the set of secondary cells to be a primary cell; and transmit a confirmation for the switching to the network device.
  • Example 22 the device of example 21, wherein the first message comprises a signaling message dedicated to the terminal device, and the device is caused to receive the set of pre-configurations by: receiving, from the network device, the set of pre-configurations in the signaling message dedicated to the terminal device.
  • Example 23 the device of example 21, wherein the second message comprises a media access control (MAC) control element (CE) , and the device is caused to receive the switch indication by: receiving, from the network device, the switch indication in the MAC CE.
  • MAC media access control
  • CE control element
  • Example24 the device of example 23, wherein the MAC CE includes authentication information.
  • Example 25 the device of example 24, wherein the authentication information comprises Message Authentication Code-Integrity (MAC-I) .
  • MAC-I Message Authentication Code-Integrity
  • Example 26 the device of example 21, wherein the second message comprises a Physical Downlink Control Channel (PDCCH) order, and the device is caused to receive the switch indication by: receiving the switch indication in the PDCCH order.
  • PDCCH Physical Downlink Control Channel
  • Example 27 the device of example 26, wherein the PDCCH order includes a field for carrying the switch indication.
  • Example28 the device of example 21, wherein the device is caused to transmit the confirmation by: transmitting the confirmation to the network device by using the at least one pre-configuration associated with the secondary cell.
  • Example 29 the device of example 28, wherein the second message comprises a media access control (MAC) control element (CE) , the at least one pre-configuration associated with the secondary cell comprises a Physical Uplink Control Channel (PUCCH) resource in the secondary cell, and the device is caused to transmit the confirmation by: transmitting a hybrid automatic repeat request (HARQ) feedback for the MAC CE as the confirmation to the network device using the PUCCH resource.
  • MAC media access control
  • CE media access control element
  • PUCCH Physical Uplink Control Channel
  • Example30 the device of example 28, wherein the at least one pre-configuration associated with the secondary cell comprises a Physical Random Access Channel (PRACH) resource in the secondary cell, and the device is caused to transmit the confirmation by: transmitting a random access request as the confirmation to the network device using the PRACH resource.
  • PRACH Physical Random Access Channel
  • Example 31 the device of example 30, wherein the switch indication includes a dedicated preamble for the random access request.
  • Example 32 the device of example 30, wherein the device is further caused to: receive a random access response from the network device; and apply the at least one pre-configuration associated with the secondary cell for communication.
  • Example 33 the device of example 30, wherein the device is further caused to: apply the at least one pre-configuration associated with the secondary cell for communication upon completion of a random access procedure initiated using the random access request.
  • Example 34 the device of example 30, wherein the device is further caused to: apply the at least one pre-configuration associated with the secondary cell for communication upon initiation of a random access procedure using the random access request.
  • Example 35 the device of example 21, wherein the device is caused to receive the switch indication by: receiving, from the network device via the second message, the switch indication in the secondary cell to indicate that the secondary cell is to be switched to be a primary cell.
  • Example 36 the device of example 21, wherein the device is caused to receive the switch indication by: receiving, from the network device via the second message in a further secondary cell, the switch indication including a cell identification for the secondary cell to switch the secondary cell indicated by the cell identification to be the primary cell.
  • Example 37 the device of example 21, wherein the device is further caused to: in response to an uplink LBT failure in a current primary cell, transmitting a request for primary cell switch to the network device.
  • Example38 the device of example 21, wherein the at least one pre-configuration associated with the secondary cell comprises at least one of: a security key for communication in the secondary cell, a Physical Uplink Control Channel (PUCCH) resource for a hybrid automatic repeat request (HARQ) feedback or a scheduling request (SR) , a Physical Random Access Channel (PRACH) resource, a common search space (CSS) , and at least one timer.
  • a security key for communication in the secondary cell a Physical Uplink Control Channel (PUCCH) resource for a hybrid automatic repeat request (HARQ) feedback or a scheduling request (SR) , a Physical Random Access Channel (PRACH) resource, a common search space (CSS) , and at least one timer.
  • PUCCH Physical Uplink Control Channel
  • HARQ hybrid automatic repeat request
  • SR scheduling request
  • PRACH Physical Random Access Channel
  • SCS common search space
  • Example 39 the device of example 21, wherein the first message comprises one of a Radio Resource Control (RRC) message, a Media Access Control (MAC) message and a Physical (PHY) layer message, and the second message comprises one of a MAC message and a PHY layer message.
  • RRC Radio Resource Control
  • MAC Media Access Control
  • PHY Physical
  • Example 40 a method comprising: transmitting, at a network device, a set of pre-configurations to a terminal device via a first message, at least one pre-configuration in the set of pre-configurations being associated with a secondary cell in a set of secondary cells and being activated if the associated secondary cell is switched to be a primary cell; transmitting, to the terminal device via a separate second message, a switch indication for switching a secondary cell in the set of secondary cells to be a primary cell; and in response to receiving a confirmation for the switching from the terminal device, causing the at least one pre-configuration associated with the secondary cell to be activated.
  • Example 41 the method of example 40, wherein the first message comprises a signaling message dedicated to the terminal device, and transmitting the set of pre-configurations comprises: transmitting the set of pre-configurations in the signaling message dedicated to the terminal device.
  • Example 42 the method of any of examples 40, wherein the second message comprises a media access control (MAC) control element (CE) , and transmitting the switch indication comprises: transmitting the switch indication in the MAC CE.
  • MAC media access control
  • CE control element
  • Example 43 the method of example 40, wherein the MAC CE includes authentication information.
  • Example44 the method of example 43, wherein the authentication information comprises Message Authentication Code-Integrity (MAC-I) .
  • MAC-I Message Authentication Code-Integrity
  • Example45 the method of example 40, wherein the second message comprises a Physical Downlink Control Channel (PDCCH) order, and transmitting the switch indication comprises: transmitting the switch indication in the PDCCH order.
  • PDCCH Physical Downlink Control Channel
  • Example 46 the method of example 45, wherein the PDCCH order includes a field for carrying the switch indication.
  • Example 47 the method of example 40, wherein the secondary cell is served by the device.
  • Example 48 the method of example 47, wherein receiving the confirmation comprises: receiving the confirmation from the terminal device by using the at least one pre-configuration associated with the secondary cell.
  • Example49 the method of example 48, wherein the second message comprises a media access control (MAC) control element (CE) , the at least one pre-configuration associated with the secondary cell comprises a Physical Uplink Control Channel (PUCCH) resource in the secondary cell, and receiving the confirmation comprises: receiving a hybrid automatic repeat request (HARQ) feedback for the MAC CE as the confirmation from the terminal device using the PUCCH resource.
  • MAC media access control
  • CE control element
  • PUCCH Physical Uplink Control Channel
  • Example50 the method of example 48, wherein the at least one pre-configuration associated with the secondary cell comprises a Physical Random Access Channel (PRACH) resource in the secondary cell, and receiving the confirmation comprises: receiving a random access request as the confirmation from the terminal device using the PRACH resource.
  • PRACH Physical Random Access Channel
  • Example51 the method of example 50, wherein the switch indication includes a dedicated preamble for the random access request.
  • Example 52 the method of example 50, wherein causing the at least one pre-configuration associated with the secondary cell to be activated comprises: in response to receiving the random access request, transmitting a random access response to the terminal device; and activating the at least one pre-configuration associated with the secondary cell.
  • Example 53 the method of example 50, wherein causing the at least one pre-configuration associated with the secondary cell to be activated comprises: activating the at least one pre-configuration associated with the secondary cell upon completion of a random access procedure initiated by the terminal device using the random access request.
  • Example 54 the method of example 47, wherein transmitting the switch indication comprises: transmitting, to the terminal device, the switch indication in the secondary cell to indicate that the secondary cell is to be switched to be a primary cell.
  • Example 55 the method of example 47, further comprising: selecting the secondary cell from the set of secondary cells to be switched to be the primary cell in response to at least one of a downlink listen before talk (LBT) failure in a current primary cell and a request for primary cell switch from the terminal device.
  • LBT downlink listen before talk
  • Example 56 the method of example 40, wherein a further secondary cell in the set of the secondary cells is served by the device, and transmitting the switch indication comprises: transmitting, to the terminal device in the further secondary cell, the switch indication including a cell identification for the secondary cell to switch the secondary cell indicated by the cell identification to be the primary cell.
  • Example 57 the method of example 40, wherein the secondary cell is served by a further network device, and causing the at least one pre-configuration associated with the secondary cell to be activated comprises: sending an activation indication to the further network device to activate the at least one pre-configuration associated with the secondary cell.
  • Example58 the method of example 40, wherein the at least one pre-configuration associated with the secondary cell comprises at least one of: a security key for communication in the secondary cell, a Physical Uplink Control Channel (PUCCH) resource for a hybrid automatic repeat request (HARQ) feedback or a scheduling request (SR) , a Physical Random Access Channel (PRACH) resource, a common search space (CSS) , and at least one timer.
  • a security key for communication in the secondary cell a Physical Uplink Control Channel (PUCCH) resource for a hybrid automatic repeat request (HARQ) feedback or a scheduling request (SR) , a Physical Random Access Channel (PRACH) resource, a common search space (CSS) , and at least one timer.
  • PUCCH Physical Uplink Control Channel
  • HARQ hybrid automatic repeat request
  • SR scheduling request
  • PRACH Physical Random Access Channel
  • SCS common search space
  • Example 59 the method of claim 40, wherein the first message comprises one of a Radio Resource Control (RRC) message, a Media Access Control (MAC) message and a Physical (PHY) layer message, and the second message comprises one of a MAC message and a PHY layer message.
  • RRC Radio Resource Control
  • MAC Media Access Control
  • PHY Physical
  • Example 60 a method comprising: receiving, at a terminal device, a set of pre-configurations from a network device via a first message, at least one pre-configuration in the set of pre-configurations being associated with a secondary cell in a set of secondary cells and being activated if the associated secondary cell is switched to be a primary cell; receiving, from the network device via a separate second message, a switch indication for switching a secondary cell in the set of secondary cells to be a primary cell; and transmitting a confirmation for the switching to the network device.
  • Example 61 the method of example 60, wherein the first message comprises a signaling message dedicated to the terminal device, and receiving the set of pre-configurations comprises: receiving, from the network device, the set of pre-configurations in the signaling message dedicated to the terminal device.
  • Example 62 the method of example 60, wherein the second message comprises a media access control (MAC) control element (CE) , and receiving the switch indication comprises: receiving, from the network device, the switch indication in the MAC CE.
  • MAC media access control
  • CE control element
  • Example 63 the method of example 60, wherein the MAC CE includes authentication information.
  • Example64 the method of example 63, wherein the authentication information comprises Message Authentication Code-Integrity (MAC-I) .
  • MAC-I Message Authentication Code-Integrity
  • Example65 the method of example 60, wherein the second message comprises a Physical Downlink Control Channel (PDCCH) order, and receiving the switch indication comprises: receiving, from the network device, the switch indication in the PDCCH order.
  • PDCCH Physical Downlink Control Channel
  • Example 66 the method of example 65, wherein the PDCCH order includes a field for carrying the switch indication.
  • Example 67 the method of example 60, wherein transmitting the confirmation comprises: transmitting the confirmation to the network device by using the at least one pre-configuration associated with the secondary cell.
  • Example68 the method of example 67, wherein the second message comprises a media access control (MAC) control element (CE) , the at least one pre-configuration associated with the secondary cell comprises a Physical Uplink Control Channel (PUCCH) resource in the secondary cell, and transmitting the confirmation comprises: transmitting a hybrid automatic repeat request (HARQ) feedback for the MAC CE as the confirmation to the network device using the PUCCH resource.
  • MAC media access control
  • CE control element
  • PUCCH Physical Uplink Control Channel
  • Example69 The method of example 68, wherein the at least one pre-configuration associated with the secondary cell comprises a Physical Random Access Channel (PRACH) resource in the secondary cell, and transmitting the confirmation comprises: transmitting a random access request as the confirmation to the network device using the PRACH resource.
  • PRACH Physical Random Access Channel
  • Example 70 The method of example 69, wherein the switch indication includes a dedicated preamble for the random access request.
  • Example71 the method of example 69, further comprising: receiving a random access response from the network device; and applying the at least one pre-configuration associated with the secondary cell for communication.
  • Example 72 the method of example 69, further comprising: applying the at least one pre-configuration associated with the secondary cell for communication upon completion of a random access procedure initiated using the random access request.
  • Example 73 the method of example 69, further comprising: apply the at least one pre-configuration associated with the secondary cell for communication upon initiation of a random access procedure using the random access request.
  • Example74 the method of example 60, wherein receiving the switch indication comprises: receiving, from the network device via the second message, the switch indication in the secondary cell to indicate that the secondary cell is to be switched to be a primary cell.
  • Example 75 the method of example 60, wherein receiving the switch indication comprises: receiving, from the network device via the second message in a further secondary cell, the switch indication including a cell identification for the secondary cell to switch the secondary cell indicated by the cell identification to be the primary cell.
  • Example 76 the method of example 60, further comprising: in response to an uplink LBT failure in a current primary cell, transmitting a request for primary cell switch to the network device.
  • Example77 the method of example 60, wherein the at least one pre-configuration associated with the secondary cell comprises at least one of: a security key for communication in the secondary cell, a Physical Uplink Control Channel (PUCCH) resource for a hybrid automatic repeat request (HARQ) feedback or a scheduling request (SR) , a Physical Random Access Channel (PRACH) resource, a common search space (CSS) , and at least one timer.
  • a security key for communication in the secondary cell a Physical Uplink Control Channel (PUCCH) resource for a hybrid automatic repeat request (HARQ) feedback or a scheduling request (SR) , a Physical Random Access Channel (PRACH) resource, a common search space (CSS) , and at least one timer.
  • PUCCH Physical Uplink Control Channel
  • HARQ hybrid automatic repeat request
  • SR scheduling request
  • PRACH Physical Random Access Channel
  • SCS common search space
  • Example 78 the method of cl example aim 60, wherein the first message comprises one of a Radio Resource Control (RRC) message, a Media Access Control (MAC) message and a Physical (PHY) layer message, and the second message comprises one of a MAC message and a PHY layer message.
  • RRC Radio Resource Control
  • MAC Media Access Control
  • PHY Physical
  • Example 79 an apparatus comprising: means for transmitting, at a network device, a set of pre-configurations to a terminal device via a first message, at least one pre-configuration in the set of pre-configurations being associated with a secondary cell in a set of secondary cells and being activated if the associated secondary cell is switched to be a primary cell; means for transmitting, to the terminal device via a separate second message, a switch indication for switching a secondary cell in the set of secondary cells to be a primary cell; and means for in response to receiving a confirmation for the switching from the terminal device, causing the at least one pre-configuration associated with the secondary cell to be activated.
  • Example80 the apparatus of example 79, wherein the first message comprises a signaling message dedicated to the terminal device, and the means for transmitting the set of pre-configurations comprises: means for transmitting the set of pre-configurations in the signaling message dedicated to the terminal device.
  • Example81 the apparatus of example 79, wherein the second message comprises a media access control (MAC) control element (CE) , and the means for transmitting the switch indication comprises: means for transmitting the switch indication in the MAC CE.
  • MAC media access control
  • CE control element
  • Example 82 the apparatus of example 81, wherein the MAC CE includes authentication information.
  • Example83 the apparatus of example 82, wherein the authentication information comprises Message Authentication Code-Integrity (MAC-I) .
  • MAC-I Message Authentication Code-Integrity
  • Example 84 the apparatus of example 79, wherein the second message comprises a Physical Downlink Control Channel (PDCCH) order, and the means for transmitting the switch indication comprises: means for transmitting the switch indication in the PDCCH order.
  • PDCCH Physical Downlink Control Channel
  • Example 85 the apparatus of example 84, wherein the PDCCH order includes a field for carrying the switch indication.
  • Example 86 the apparatus of example 79, wherein the secondary cell is served by the device.
  • Example 87 the apparatus of example 86, wherein the means for receiving the confirmation comprises: means for receiving the confirmation from the terminal device by using the at least one pre-configuration associated with the secondary cell.
  • Example 88 the apparatus of example 87, wherein the second message comprises a media access control (MAC) control element (CE) , the at least one pre-configuration associated with the secondary cell comprises a Physical Uplink Control Channel (PUCCH) resource in the secondary cell, and the means for receiving the confirmation comprises: means for receiving a hybrid automatic repeat request (HARQ) feedback for the MAC CE as the confirmation from the terminal device using the PUCCH resource.
  • MAC media access control
  • CE control element
  • PUCCH Physical Uplink Control Channel
  • Example89 the apparatus of example 87, wherein the at least one pre-configuration associated with the secondary cell comprises a Physical Random Access Channel (PRACH) resource in the secondary cell, and the means for receiving the confirmation comprises: means for receiving a random access request as the confirmation from the terminal device using the PRACH resource.
  • PRACH Physical Random Access Channel
  • Example 90 the apparatus of example 89, wherein the switch indication includes a dedicated preamble for the random access request.
  • Example 91 The apparatus of example 89, wherein the means for causing the at least one pre-configuration associated with the secondary cell to be activated comprises: means for in response to receiving the random access request, transmitting a random access response to the terminal device; and activating the at least one pre-configuration associated with the secondary cell.
  • Example 92 the apparatus of apparatus 89, wherein the means for causing the at least one pre-configuration associated with the secondary cell to be activated comprises: means for activating the at least one pre-configuration associated with the secondary cell upon completion of a random access procedure initiated by the terminal device using the random access request.
  • Example 93 the apparatus of example 79, wherein the means for transmitting, to the terminal device, the switch indication comprises: means for transmitting the switch indication via the second message in the secondary cell to indicate that the secondary cell is to be switched to be a primary cell.
  • Example 94 the apparatus of example 79, further comprising: means for selecting the secondary cell from the set of secondary cells to be switched to be the primary cell in response to at least one of a downlink listen before talk (LBT) failure in a current primary cell and a request for primary cell switch from the terminal device.
  • LBT downlink listen before talk
  • Example 95 the apparatus of example 79, wherein a further secondary cell in the set of the secondary cells is served by the device, and the means for transmitting the switch indication comprises: means for transmitting, to the terminal device via the second message in the further secondary cell, the switch indication including a cell identification for the secondary cell to switch the secondary cell indicated by the cell identification to be the primary cell.
  • Example 96 the apparatus of example 79, wherein the secondary cell is served by a further network device, and the means for causing the at least one pre-configuration associated with the secondary cell to be activated comprises: means for sending an activation indication to the further network device to activate the at least one pre-configuration associated with the secondary cell.
  • Example97 the apparatus of example 79, -wherein the at least one pre-configuration associated with the secondary cell comprises at least one of: a security key for communication in the secondary cell, a Physical Uplink Control Channel (PUCCH) resource for a hybrid automatic repeat request (HARQ) feedback or a scheduling request (SR) , a Physical Random Access Channel (PRACH) resource, a common search space (CSS) , and at least one timer.
  • a security key for communication in the secondary cell a Physical Uplink Control Channel (PUCCH) resource for a hybrid automatic repeat request (HARQ) feedback or a scheduling request (SR) , a Physical Random Access Channel (PRACH) resource, a common search space (CSS) , and at least one timer.
  • PUCCH Physical Uplink Control Channel
  • HARQ hybrid automatic repeat request
  • SR scheduling request
  • PRACH Physical Random Access Channel
  • SCS common search space
  • Example98 the apparatus of example 79, wherein the first message comprises one of a Radio Resource Control (RRC) message, a Media Access Control (MAC) message and a Physical (PHY) layer message, and the second message comprises one of a MAC message and a PHY layer message.
  • RRC Radio Resource Control
  • MAC Media Access Control
  • PHY Physical
  • Example 99 An apparatus comprising: means for receiving, at a terminal device, a set of pre-configurations from a network device via a separate second message, at least one pre-configuration in the set of pre-configurations being associated with a secondary cell in a set of secondary cells and being activated if the associated secondary cell is switched to be a primary cell; means for receiving, from the network device via a separate second message, a switch indication for switching a secondary cell in the set of secondary cells to be a primary cell; and means for transmitting a confirmation for the switching to the network device.
  • Example 100 the apparatus of example 99, wherein the first message comprises a signaling message dedicated to the terminal device, and the means for receiving the set of pre-configurations comprises: means for receiving, from the network device, the set of pre-configurations in the signaling message dedicated to the terminal device.
  • Example 101 the apparatus of example 99, wherein the second message comprises a media access control (MAC) control element (CE) , and the means for receiving, from the network device, the switch indication comprises: means for receiving the switch indication in the MAC CE.
  • MAC media access control
  • CE control element
  • Example 102 the apparatus of example 101, wherein the MAC CE includes authentication information.
  • Example 103 the apparatus of example 102, wherein the authentication information comprises Message Authentication Code-Integrity (MAC-I) .
  • MAC-I Message Authentication Code-Integrity
  • Example 104 the apparatus of example 99, wherein the second message comprises a Physical Downlink Control Channel (PDCCH) order, and the means for receiving the switch indication comprises: means for receiving the switch indication in the PDCCH order.
  • PDCCH Physical Downlink Control Channel
  • Example 105 the apparatus of example 104, wherein the PDCCH order includes a field for carrying the switch indication.
  • Example 106 the apparatus of example 99, wherein the means for transmitting the confirmation comprises: means for transmitting the confirmation to the network device by using the at least one pre-configuration associated with the secondary cell.
  • Example 107 the apparatus of example 106, wherein the second message comprises a media access control (MAC) control element (CE) , the at least one pre-configuration associated with the secondary cell comprises a Physical Uplink Control Channel (PUCCH) resource in the secondary cell, and the means for transmitting the confirmation comprises: means for transmitting a hybrid automatic repeat request (HARQ) feedback for the MAC CE as the confirmation to the network device using the PUCCH resource.
  • MAC media access control
  • CE media access control element
  • PUCCH Physical Uplink Control Channel
  • Example 108 the apparatus of example 106, wherein the at least one pre-configuration associated with the secondary cell comprises a Physical Random Access Channel (PRACH) resource in the secondary cell, and the means for transmitting the confirmation comprises: transmitting a random access request as the confirmation to the network device using the PRACH resource.
  • PRACH Physical Random Access Channel
  • Example 109 the apparatus of example 108, wherein the switch indication includes a dedicated preamble for the random access request.
  • Example 110 the apparatus of example 108, further comprising: means for receiving a random access response from the network device; and applying the at least one pre-configuration associated with the secondary cell for communication.
  • Example 111 the apparatus of example 108, further comprising: means for applying the at least one pre-configuration associated with the secondary cell for communication upon completion of a random access procedure initiated using the random access request.
  • Example 113 the apparatus of example 99, wherein the means for receiving, from the network device via the second message, the switch indication comprises: means for receiving the switch indication in the secondary cell to indicate that the secondary cell is to be switched to be a primary cell.
  • Example 114 the apparatus of example 99, wherein the means for receiving the switch indication comprises: means for receiving, from the network device via the second message in a further secondary cell, the switch indication including a cell identification for the secondary cell as to switch the secondary cell indicated by the cell identification to be the primary cell.
  • Example 115 the apparatus of example 99, further comprising: means for in response to an uplink LBT failure in a current primary cell, transmitting a request for primary cell switch to the network device.
  • Example 116 the apparatus of example 99, wherein the at least one pre-configuration associated with the secondary cell comprises at least one of: a security key for communication in the secondary cell, a Physical Uplink Control Channel (PUCCH) resource for a hybrid automatic repeat request (HARQ) feedback or a scheduling request (SR) , a Physical Random Access Channel (PRACH) resource, a common search space (CSS) , and at least one timer.
  • a security key for communication in the secondary cell a Physical Uplink Control Channel (PUCCH) resource for a hybrid automatic repeat request (HARQ) feedback or a scheduling request (SR) , a Physical Random Access Channel (PRACH) resource, a common search space (CSS) , and at least one timer.
  • PUCCH Physical Uplink Control Channel
  • HARQ hybrid automatic repeat request
  • SR scheduling request
  • PRACH Physical Random Access Channel
  • SCS common search space
  • Example 117 the apparatus of example 99, wherein the first message comprises one of a Radio Resource Control (RRC) message, a Media Access Control (MAC) message and a Physical (PHY) layer message, and the second message comprises one of a MAC message and a PHY layer message.
  • RRC Radio Resource Control
  • MAC Media Access Control
  • PHY Physical
  • Example 118 a computer readable storage medium comprising program instructions stored thereon, the instructions, when executed by a processor of a device, causing the device to perform the method of any of examples 40-59.
  • Example 119 a computer readable storage medium comprising program instructions stored thereon, the instructions, when executed by a processor of a device, causing the device to perform the method of any of examples 60-78.

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

Abstract

La présente invention concerne, selon des modes de réalisation, des dispositifs, des procédés, des appareils et des supports d'enregistrement lisibles par ordinateur pour un changement de cellule primaire. Dans des modes de réalisation donnés à titre d'exemple, un dispositif de réseau transmet un ensemble de pré-configurations à un dispositif terminal par l'intermédiaire d'un premier message. Au moins une pré-configuration dans l'ensemble de pré-configurations est associée à une cellule secondaire dans un ensemble de cellules secondaires et est activée si la cellule secondaire associée est commutée comme étant une cellule primaire. Le dispositif de réseau transmet, au dispositif terminal par l'intermédiaire d'un second message séparé, une indication de commutation pour commuter une cellule secondaire dans l'ensemble de cellules secondaires comme étant une cellule primaire. En réponse à la réception d'une confirmation pour la commutation à partir du dispositif de terminal, le dispositif de réseau amène la ou les pré-configuration associées à la cellule secondaire à être activée.
PCT/CN2019/075114 2019-02-14 2019-02-14 Changement de cellule primaire WO2020164070A1 (fr)

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PCT/CN2019/075114 WO2020164070A1 (fr) 2019-02-14 2019-02-14 Changement de cellule primaire
CN201980092244.8A CN113455049B (zh) 2019-02-14 2019-03-28 主小区改变
PCT/CN2019/080258 WO2020164177A1 (fr) 2019-02-14 2019-03-28 Changement de pile non rechargeable
EP19915492.3A EP3925297A4 (fr) 2019-02-14 2019-03-28 Changement de pile non rechargeable

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PCT/CN2019/075114 WO2020164070A1 (fr) 2019-02-14 2019-02-14 Changement de cellule primaire

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EP3925297A1 (fr) 2021-12-22

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