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WO2019105064A1 - Procédé et appareil de transmission de signal, équipement de réseau - Google Patents

Procédé et appareil de transmission de signal, équipement de réseau Download PDF

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Publication number
WO2019105064A1
WO2019105064A1 PCT/CN2018/099982 CN2018099982W WO2019105064A1 WO 2019105064 A1 WO2019105064 A1 WO 2019105064A1 CN 2018099982 W CN2018099982 W CN 2018099982W WO 2019105064 A1 WO2019105064 A1 WO 2019105064A1
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WIPO (PCT)
Prior art keywords
capability
neighboring cell
interface
serving enb
signal
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PCT/CN2018/099982
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English (en)
Inventor
Yixue Lei
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Guangdong Oppo Mobile Telecommunications Corp Ltd
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Guangdong Oppo Mobile Telecommunications Corp Ltd
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Priority to CN201880003807.7A priority Critical patent/CN110100476B/zh
Publication of WO2019105064A1 publication Critical patent/WO2019105064A1/fr
Anticipated expiration legal-status Critical
Ceased legal-status Critical Current

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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

Definitions

  • This application relates to the field of wireless communication technology, and particularly to a method for signal transmission, apparatus for signal transmission, and network equipment.
  • radio resource control (RRC) connection reestablishment is performed when there is radio link failure (RLF) , and user equipment (UE) can send RRC connection reestablishment to a serving cell or a neighboring cell.
  • RLF radio link failure
  • UE user equipment
  • RRC connection can be reestablished and the UE doesn’t need to enter an idle state and then spend quite a lot signaling step to setup a RRC connection from random access channel (RACH) procedure.
  • RACH random access channel
  • the fifth generation (5G) mobile communication technology is an extension to the fourth generation (4G) mobile communication technology. Therefore, the 5G communication system is known as the “super 4G network” , “post LTE system” , or the new radio (NR) .
  • the base station in 5G NR will be referred to as gNB, En-gNB, or NR gNB.
  • E-UTRAN NR dual connectivity E-UTRAN NR dual connectivity
  • LTE-NR dual connectivity E-UTRAN NR dual connectivity
  • the UE may have ambiguity on whether to use LTE packet data convergence protocol (PDCP) or NR PDCP.
  • PDCP packet data convergence protocol
  • NR PDCP NR packet data convergence protocol
  • a method for signal transmission in which a serving eNB transmits a first signal indicating EN-DC capability of at least one neighboring cell to user equipment (UE) .
  • UE user equipment
  • a network equipment is provided.
  • the network equipment is a serving eNB of a UE.
  • the network equipment includes a transmitting unit, configured to transmit a first signal for indicating EN-DC capability of at least one neighboring cell to the UE.
  • a UE includes a receiving unit and a controlling unit.
  • the receiving unit is configured to receive system information or RRC signaling indicating EN-DC capability of at least one neighboring cell from a serving eNB.
  • the controlling unit is configured to prioritize the at least one neighboring cell as a target to reestablish a radio resource control (RRC) connection or a target of cell reselection according to the EN-DC capability indicated by the system information or the RRC signaling.
  • RRC radio resource control
  • an apparatus for signal transmission includes at least one processor and a memory coupled with the at least one processor.
  • the memory is configured to store at least one program which, when executed by the at least one processor, cause the at least one processor to carry out the foregoing method of the first aspect.
  • a non-transitory computer readable storage medium configured to store at least one programs which, when executed by a computer, cause the computer to carry out the foregoing method of the first aspect.
  • FIG. 1 is a diagram illustrating an overall radio access network (RAN) architecture of EN-DC.
  • RAN radio access network
  • FIG. 2 is a diagram illustrating interface (s) between base stations and interface (s) between base stations and the core network.
  • FIG. 3 is a diagram illustrating a 5G system service-based architecture.
  • FIG. 4 is a diagram illustrating PDCP and bearer in the EN-DC mode.
  • FIG. 5 is a diagram illustrating network equipment.
  • FIG. 6 is a diagram illustrating a method for signal transmission according to embodiment of the disclosure.
  • FIG. 7 is a block diagram illustrating apparatuses for signal transmission according to an embodiment of the disclosure.
  • serving cell For a UE in RRC_CONNECTED not configured with carrier aggregation (CA) there is only one serving cell comprising of the primary cell.
  • serving cells For a UE in RRC_CONNECTED configured with CA, the term “serving cells” is used to denote the set of one or more cells comprising of the primary cell and all secondary cells.
  • Neighbor cell or neighboring cell A cell in UTRAN, LTE or GSM/GERAN that is a neighbor cell to a base UTRAN cell.
  • FIG. 1 is a diagram illustrating an overall radio access network (RAN) architecture of EN-DC.
  • the exemplary environment of FIG. 1 is suitable for implementing the method for signal transmission of the disclosure.
  • the exemplary EN-DC environment of FIG. 1 is intended to illustrated examples of some of the ways in which UE such as a mobile device might connect to more than one networks.
  • EN-DC allows a device (UE) to exchange data between itself and NR base station (NR gNB) along with simultaneous connection with LTE base station (LTE eNB) .
  • NR gNB NR base station
  • LTE eNB LTE base station
  • LTE eNB provides a primary cell (PCell) and a serving cell as a master node (MN, in FIG.
  • PCell primary cell
  • MN master node
  • NR gNB provides primary cell &secondary cell (PSCells) and serving cells as a secondary node (SN, in FIG. 1, SgNG) .
  • the MeNB and the SgNB can communicate with each other via the X2-C interface and the X2-U interface for example, where the X2-C interface is a control plane interface for transmitting signaling and/or message, and the X2-U interface is user plane interface for data transmission.
  • the interfaces will be further detailed below with reference to FIG. 2.
  • UE communicates with both LTE eNB and NR gNB in radio side, but all those communications (signaling and data) are going through LTE core network.
  • the LTE eNB is referred to as the MeNB to indicate that it is the “Master” (M) base station controlling the “Secondary” (S) 5G NR base station (SgNB) . Both the MeNB and the SgNB are network equipment.
  • the UE mentioned in this disclosure can be stationary or it could be moving.
  • SIM subscriber identity module
  • the UE or the terminal device can take the form of any kind of information communication devices, multimedia devices and/or their applications, mobile devices, mobile stations, mobile units, machine-to-machine (M2M) devices, wireless units, remote units, user-agent, mobile client, and the like.
  • M2M machine-to-machine
  • Examples of the UE include but are not limited to a mobile communication terminal, a wired/wireless phone, a personal digital assistant (PDA) , a smart phone, a vehicle-mounted communication device.
  • PDA personal digital assistant
  • FIG. 2 further illustrates the interface between base stations and the interface between base stations and the core network. The following discussion is directed to the interfaces in combination with FIG. 1 and FIG. 2.
  • C-plane For the control-plane (C-plane) , as illustrated on the right half of FIG. 2, there is an interface between the master node (MN, MeNB in the architectures of FIG. 1 and FIG. 2) and the secondary node (SN, SgNB in the architectures of FIG. 1 and FIG. 2) .
  • the interface between MN and SN is called X2-C.
  • MN and core network There is an interface between MN and core network (CN) .
  • the core network includes mobility management entity (MME) , service gateway (S-GW) , and other network units.
  • MME mobility management entity
  • S-GW service gateway
  • the CN is referred to by various names depending upon the wireless architecture employed, and herein, in this case, CN refers to MME.
  • S1-MME or S1-C There is NO direct interface (connection) between SN and CN.
  • the user-plane For the user-plane (U-plane) , as illustrated on the left half of FIG. 2, there is an interface between the master node (MN, MeNB in this case) and the secondary node (SN, SgNB in this case) .
  • the interface between MN and SN is called X2-U.
  • the X2 interface refers to the interface between the eNB and the eNB/gNB.
  • MN and CN which is called S1-U.
  • S1-U Different from the C-plane, there is an interface (connection) between SN and CN, and the interface is called S1-U.
  • both the MeNB and the SgNB have an S1-U (User) interface.
  • the S1 interface and the X2 interface are just examples, with the development of technology or according to actual needs, other existing or future possible backhaul interface (Xn interface for example) can also be used.
  • user data i.e. IP packets
  • the S1 interface such as the S1-U interface, the S1-C interface, and the like, is configured for such purpose.
  • the EN-DC mode the user data is exchanged by the S-GW with the 5G SgNB and the UE exchanges user data with the SgNB and the MeNB simultaneously.
  • FIG. 3 is a diagram illustrating a 5G system service-based architecture.
  • N2 refers to a reference point between a mobility management function (AMF) and generic radio access network (RAN) .
  • AMF mobility management function
  • RAN generic radio access network
  • the N2 interface can be deemed as a logical interface or functional interface. Similar as the S1 interface, the N2 interface can be applied for packet transmission.
  • the reference point is an interactive interface or protocol mapping relationship between two network functional modules.
  • FIG. 4 is a diagram illustrating an overall layer 2 architecture in which, the LTE eNB is a MN and the NR gNB is a SN.
  • PDCP packet data convergence protocol
  • PDCP is a protocol specified by 3GPP in TS 25.323 for UMTS, TS 36.323 for LTE and TS 38.323 for 5G NR; as illustrated in FIG. 4, the PDCP is located in the radio protocol stack in the UMTS/LTE/5G air interface on top of the radio link control (RLC) layer.
  • RLC radio link control
  • Radio Bearer is a general term for a series of protocol entities and configurations allocated by the eNodeB to the UE.
  • RB is the channel through which a Uu interface connects the eNB and the UE. Any data transmitted via the Uu interface must pass through the RB.
  • RB includes signal radio bearer (SRB) and data radio bearer (DRB) , among them, SRB is the channel through which the system’s signaling message is transmitted, while DRB is the channel through which user data is transmitted.
  • SRB1 is configured for RRC message and SRB2 is configured to transmit network attached storage (NAS) signaling.
  • NAS network attached storage
  • UE can use LTE PDCP to send MSG1/3 to eNB, but after signal radio bearer 2 (SRB2) and data radio bearer (DRB) are configured, NR-PDCP can be used for SRB and DRB in MN.
  • SRB2 signal radio bearer 2
  • DRB data radio bearer
  • LTE packet data convergence protocol may not be always used.
  • a neighboring LTE cell may or may not support EN-DC, in other words, a neighboring cell’s eNB may or may not be able to comprehend one RRC connection reestablishment message using NR PDCP, UE may have no idea about whether to use LTE PDCP or NR PDCP. Therefore, there are still remain issues need to be solved. For example, how to make the UE know whether an eNB in a neighboring cell supports EN-DC or not? If the UE knows that eNB in the neighboring cell can or cannot support EN-DC, how UE and eNBs handle the reestablishment process?
  • embodiments of the disclosure provides a method for signal transmission, with which it is possible to solve the problem of UE’s ambiguity when the UE is configured in EN-DC and needs to perform RRC connection reestablishment.
  • certain exemplary architectures have given above with reference to FIG. 1 to FIG. 4. It should be noted that, the system architectures illustrated in FIG. 1 to FIG. 4 are for illustrative purpose only and are not intent to impose any restrictions on this disclosure. Although the architectures of LTE and 5G are taken as examples for explanation, this disclosure is not limited thereto and may be applied to other M2M system for example.
  • FIG. 5 is a diagram illustrating network equipment according to an embodiment.
  • Network equipment 50 can be functioned as a serving eNB of UE.
  • the serving eNB may be an eNB or gNB illustrated in FIG. 1.
  • the network equipment 50 includes one or more network device processors 51, a memory 52, a communication interface 53, a transmitter 55, a receiver 56. These components may be connected via a bus 54 or other means.
  • the network equipment 50 may further include a coupler 57 and an antenna 58 connected to the coupler.
  • Communication interface 203 can be a LTE (4G) communication interface, a 5G communication interface, or a future new air interface.
  • Communication interface 53 may be used for network equipment 50 to communicate with other communication devices, such as a terminal device or other network device.
  • the communication interface 53 can include the interface illustrated in FIG. 2, such as a S1 interface (or NG interface) , a Uu interface and so on.
  • the connection between the network equipment 50 and other network equipments can be a wired communication connection.
  • the network equipment 50 may also be equipped with a wired interface for wired communication.
  • Transmitter 55 may be used to transmit signals output from network device processor 51, such as perform signal modulation.
  • the transmitter 55 can be configured to transmit EN-DC capability information in various manners given later.
  • Receiver 56 can be used for receiving and/or processing of signals received via antenna 58, for example, signal demodulation.
  • the transmitter 55 and the receiver 56 can be considered as a wireless modem.
  • more than one transmitter 55 can be provided.
  • more than one receiver 56 can be provided.
  • Network device processor 51 can be responsible for wireless channel management, communication links establishment, and cell switching control for users within the control area.
  • Network device processor 51 can also read and executed computer readable instructions such as those stored memory 52 which is coupled thereto.
  • Memory 52 is configured to store various software programs and/or instructions, operating systems, and network communication programs or protocols.
  • Memory 202 may include high speed random access memory (RAM) , and can also include non-transitory memory, such as one or more disk storage devices, flash memory devices, or other nonvolatile solid-state storage devices.
  • the structure illustrated in FIG. 5 can be also equally applies to terminals which can communicate with the network equipment.
  • the receiver 56, the communication interface 53, and/or the antenna 58 can be applied to receive the EN-DC capability information from the network equipment, the receiver 56 may further demodulate the information and forward the demodulated information to the processor 51 for subsequent process or may store the demodulated information in the memory 52.
  • a method for signal transmission is provided. As illustrated in FIG. 6, in this method for signal transmission, a serving eNB transmits a first signal indicating EN-DC capacity of at least one neighboring cell to a UE.
  • the serving eNB can be the MeNB or the SgNB illustrated in FIG. 1 or FIG. 2.
  • the neighboring cell can be the cell corresponding to the MeNB or the SgNB illustrated in FIG. 1 or FIG. 2.
  • the expression of “at least one neighboring cell” means that, there may be more than one neighboring cell and the serving eNB may transmit the EN-DC capacity of multiple neighboring cells it already knows all at once, or, the serving eNB may transmit the EN-DC capacity of only one neighboring cell each time, the disclosure is not particularly limited.
  • the EN-DC capacity of the neighboring cell means that the cell allows a device such as UE to connect to LTE and 5G NR simultaneously, that is, allows dual connection.
  • signal can be broadly comprehended as wireless signal, data, package, information, signaling, or any other kinds of information carrier.
  • first goes before the term “signal” is only used to distinguish this signal from other signals that may be referred to herein, rather than to define a specific order or sequence. Based on different forms of the first signal, the following implementations depicts different solutions, each of which contributes to its advantages and each will be described in detail below.
  • the first signal may be configured such that system information for indicating the EN-DC capability of the neighboring cell can be carried thereon.
  • the first signal is a system information block (SIB) carrying an information element (IE) for EN-DC capability indication.
  • SIB system information block
  • IE information element
  • the first signal takes the form of system information.
  • the serving eNB via system information, informs the UE about the neighboring cells’capability for EN-DC.
  • the system information can be transmitted on a RB via a Uu interface between the serving eNB and the UE for example.
  • This solution requires the serving eNB to collect the neighboring cells’EN-DC capability, for example, via a X2 interface between the serving eNB and the neighboring cell (such as the X2 interface illustrated in FIG. 1 or FIG. 2) .
  • it desirable to introduce new IE in SIB. For instance, different fields or flag bits can be set in the IE to indicate different neighboring cells.
  • all UE within the serving cell can acquire this system information.
  • idle mode UE it can use such information during cell reselection, e.g., one UE which is likely to have high data rate service can prioritize a cell which is EN-DC capable.
  • connected UE it can get such information before RLF happens so that when RLF happens it can try to send RRC connection reestablishment to an eNB which is EN-DC capable. The reason is that only if the neighbor cell is EN-DC capable, the UE can resume the RRC connection with the neighboring cell and keep the MCG and SCG bearers. If the neighboring cell is not EN-DC capable, even if UE resumes RRC connection with the cell, it has to release the RRC connection.
  • the first signal is RRC signaling.
  • the RRC signaling carries an IE for EN-DC capability indication.
  • the serving eNB via RRC signaling such as dedicated RRC signaling, informs the UE about the neighboring cells’capability for EN-DC.
  • the RRC signaling can be transmitted on a RB via a Uu interface between the serving eNB and the UE for example.
  • the RB can be SRB1 as described above.
  • This solution also requires the serving eNB to collect the neighboring cells’EN-DC capability, for example, via a X2 interface between the serving eNB and the neighboring cell. In order to inform the EN-DC capability collected, it’s desirable to introduce new IE in the dedicated RRC signaling or RRC message.
  • All the connected UE within the serving cell can acquire this RRC signaling so that when RLF happens, it can try to send RRC connection reestablishment to an eNB which is EN-DC capable.
  • the reason is that only if the neighbor cell is EN-DC capable, the UE can resume the RRC connection with the neighboring cell and keep the MCG and SCG bearers. If the neighboring cell is not EN-DC capable, even if UE resumes RRC connection with the cell, it has to release the RRC connection. Idle mode UE cannot enjoy the benefit of this solution.
  • the serving cell has to collect such information first.
  • the serving eNB can collect the EN-DC capability of the at least one neighboring cell via operation, administration, and maintenance (OAM) configuration.
  • the serving eNB can collect the EN-DC capability of the at least one neighboring cell via signaling over X2/Xn interface or via S1/N2 interface.
  • the X2/Xn interface and the S1interface can be the one illustrated in FIG. 1 and FIG. 2, the N2 interface can be the reference point illustrated in FIG. 3.
  • the serving cell collects the EN-DC capability from a neighboring cell directly through the X2 interface; in case where the S1 interface is used, the EN-DC capability from the neighboring cell is forwarded by the CN to the serving cell through the S1 interface.
  • the serving eNB can also obtain the neighboring cell’s EN-DC capability from another UE (we use the expression “another UE” to distinguish from the UE that receives the first signal from the serving eNB) .
  • another UE can report neighboring cell’s EN-DC capability, if any, to the serving eNB.
  • Such communication can be achieved via a Uu interface (not illustrated in the figures) between the UE and the serving eNB. This shows feasibility of the serving eNB to collect neighboring cell’s EN-DC capability.
  • UE when UE knows neighboring cells’EN-DC capability, it will prioritize the cell as target for reestablishment and resumes connection towards that cell, or treat the cell as a target for cell reselection.
  • UE and RAN handle RRC connection reestablishment within mixed NG-RAN.
  • a connected UE can know the neighboring cell (or target cell) ’s EN-DC capability and can make a decision as whether to reestablish to the neighboring cell in order to maintain EN-DC as possible to achieve service continuity.
  • an idle mode UE can use the EN-DC capability information during cell reselection.
  • Embodiments of the disclosure also provide an apparatus for signal transmission, which can be applied to implement the forgoing method for signal transmission.
  • FIG. 7 is a block diagram illustrating a system including the apparatus.
  • the apparatus for signal transmission which is applicable to a serving eNB of UE, is illustrated as network equipment 12, while the apparatus for signal transmission, which is applicable to UE, is illustrated as UE 10.
  • the network equipment 12 is not necessarily bound with the UE 10; it can be used or deployed separately with other UE.
  • the UE 10 illustrated in FIG. 7 can be used in connection with other network equipment either.
  • a UE 10 is in wireless communication with network equipment 12.
  • the UE 10 can be the terminal device illustrated in FIG. 1, the network equipment 12 is a serving eNB and can be the MeNB or SgNB illustrated in FIG. 1 or FIG. 2.
  • the network equipment 12 has a transmitting unit 72 and a first receiving unit 74.
  • the transmitting unit 72 can be a transmitter, a transceiver, antennas, and the like.
  • the transmitting unit 72 may be implemented as the transmitter 55 of FIG. 5.
  • the transmitting unit 72 is structured to be able to transmit a first signal for indicating EN-DC capability of at least one neighboring cell to the UE 10.
  • the first signal can be system information or RRC signaling, and can be transmitted via a Uu interface between the network equipment 12 and the UE 10.
  • the first receiving unit 74 is configured to collect neighboring cell’s EN-DC capability from outside, such as via OAM configuration or by signaling via X2/Xn interface or S1/N2 interface, or receive neighboring cell’s EN-DC capability reported by other UE rather than the UE 10 via a Uu interface for example. Once the neighboring cell’s EN-DC capability is collected, the first receiving unit 74 can forward it to the transmitting unit 72 to inform the UE 10. To this end, there may be a wired or wireless connection between the transmitting unit 72 and the first receiving unit 74.
  • the receiving unit 74 can be embodied as antennas, receivers, or other functional logic components.
  • the first receiving unit 74 can be the receiver 56 of FIG. 5.
  • the transmitting unit 72 and the first receiving unit 74 can be integrated into one whole or can be deployed as separate components.
  • the UE 10 has a second receiving unit 76 and a controlling unit 78 coupled with the second receiving unit 76.
  • the second receiving unit 76 is configured to receive system information or RRC signaling indicating EN-DC capability of at least one neighboring cell from a serving eNB, in FIG. 7, network equipment 12.
  • the second receiving unit 76 of UE 10 can be in wireless communication with the transmitting 72 of network equipment 12, for example, via a Uu interface.
  • the controlling unit 78 is configured to make use of the EN-DC capability of at least one neighboring cell received by the second receiving unit 76 of the UE 10. For example, when the UE 10 is in a connected state, the controlling unit 78 is configured to prioritize the at least one neighboring cell as a target to reestablish a radio resource control (RRC) connection, according to the received EN-DC capability indicated by the system information or the RRC signaling. When the UE 10 is in an idle state, the controlling unit 78 is configured to prioritize the at least one neighboring cell as a target of cell reselection, according to the received EN-DC capability indicated by the system information or the RRC signaling. For example, if the UE 10 is likely to have high data rate service, it can prioritize a cell which is EN-DC capable.
  • RRC radio resource control
  • the structure illustrated in the figures show only a simplified design of the corresponding apparatus.
  • the apparatus may include any number of transmitters, receivers, processors, memories, etc., to implement the functions or operations performed by the equipment, and all equipments that can implement the technical solutions provided herein are within the protection scope of this application.
  • network equipment is further provided.
  • the network equipment includes at least one processor and a memory coupled with the processor.
  • the network equipment can be configured to be structured as the network equipment50 illustrated in FIG. 5 and correspondingly, the at least one processor can be embodied as the processor 51 and the memory can be embodied as the memory 52.
  • the memory is configured to store at least one program which, when executed by the at least one processor, cause the at least one processor to carry out all or part of the operations of the method for signal transmission of the disclosure.
  • each apparatus embodiment may refer to related methods in the related method embodiments.
  • a non-transitory computer readable storage medium is provided.
  • the non-transitory computer readable storage medium is configured to store at least one computer readable program which, when executed by a computer, cause the computer to carry out all or part of the operations of the method for signal transmission of the disclosure.
  • Examples of the non-transitory computer readable storage medium include but are not limited to read only memory (ROM) , random storage memory (RAM) , disk or optical disk, and the like.

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Abstract

L'invention concerne un procédé et un appareil de transmission de signal et un équipement de réseau. Selon le procédé de transmission de signal, un eNB de desserte transmet un premier signal indiquant une capacité EN-DC d'au moins une cellule voisine à un équipement utilisateur.
PCT/CN2018/099982 2017-11-29 2018-08-10 Procédé et appareil de transmission de signal, équipement de réseau Ceased WO2019105064A1 (fr)

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