WO2015003353A1 - 一种通信方法及装置 - Google Patents

一种通信方法及装置 Download PDF

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Publication number
WO2015003353A1
WO2015003353A1 PCT/CN2013/079182 CN2013079182W WO2015003353A1 WO 2015003353 A1 WO2015003353 A1 WO 2015003353A1 CN 2013079182 W CN2013079182 W CN 2013079182W WO 2015003353 A1 WO2015003353 A1 WO 2015003353A1
Authority
WO
WIPO (PCT)
Prior art keywords
base station
user equipment
data transmission
status report
rlc status
Prior art date
Application number
PCT/CN2013/079182
Other languages
English (en)
French (fr)
Inventor
戴明增
张健
黄曲芳
曾清海
Original Assignee
华为技术有限公司
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 华为技术有限公司 filed Critical 华为技术有限公司
Priority to CN201380002553.4A priority Critical patent/CN104429109B/zh
Priority to CN201811288761.6A priority patent/CN109327833B/zh
Priority to PCT/CN2013/079182 priority patent/WO2015003353A1/zh
Publication of WO2015003353A1 publication Critical patent/WO2015003353A1/zh

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Classifications

    • HELECTRICITY
    • H04ELECTRIC COMMUNICATION TECHNIQUE
    • H04WWIRELESS COMMUNICATION NETWORKS
    • H04W12/00Security arrangements; Authentication; Protecting privacy or anonymity
    • H04W12/04Key management, e.g. using generic bootstrapping architecture [GBA]
    • H04W12/041Key generation or derivation
    • HELECTRICITY
    • H04ELECTRIC COMMUNICATION TECHNIQUE
    • H04WWIRELESS COMMUNICATION NETWORKS
    • H04W12/00Security arrangements; Authentication; Protecting privacy or anonymity
    • H04W12/04Key management, e.g. using generic bootstrapping architecture [GBA]
    • HELECTRICITY
    • H04ELECTRIC COMMUNICATION TECHNIQUE
    • H04LTRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
    • H04L5/00Arrangements affording multiple use of the transmission path
    • H04L5/0001Arrangements for dividing the transmission path
    • H04L5/0003Two-dimensional division
    • H04L5/0005Time-frequency
    • H04L5/0007Time-frequency the frequencies being orthogonal, e.g. OFDM(A), DMT
    • H04L5/001Time-frequency the frequencies being orthogonal, e.g. OFDM(A), DMT the frequencies being arranged in component carriers

Definitions

  • the present invention relates to the field of communications, and in particular, to a communication method and apparatus.
  • LTE-A LTE-Advanced, LTE-A, LTE-Advanced, LTE-Advanced, LTE-Advanced (Long Term Evolution) Standardization work for evolution is underway.
  • Carrier Aggregation (CA) technology is introduced into LTE-A.
  • Carrier aggregation means that user equipment can simultaneously use multiple component carriers (CC, Component Carrier) for uplink and downlink communication, thus enabling high-speed data transmission.
  • a base station may include one or more cells (one primary cell and other multiple secondary cells), wherein the cell is an area covered by the base station using electromagnetic waves.
  • carrier aggregation of an LTE system mainly includes carrier aggregation between cells within a base station and carrier aggregation between base stations.
  • carrier aggregation between the cells in the base station when the user equipment is disconnected from the primary cell, the user equipment and the secondary cell are also disconnected, that is, the user equipment suspends communication with the primary and secondary base stations.
  • Embodiments of the present invention provide a communication method and apparatus, which can maximize the continuity of data transmission between a user equipment and a base station in a carrier aggregation scenario.
  • an embodiment of the present invention provides a communication method, including: a user equipment performs data transmission with a first base station and a second base station by using a first security key, where the first base station and the second base station are Carrier aggregation
  • the user equipment When the user equipment is disconnected from the first base station, the user equipment maintains data transmission with the second base station;
  • the user equipment acquires indication information, and is used to instruct the user equipment to perform data transmission with the first base station via a second security key.
  • the acquiring, by the user equipment, the indication information includes:
  • the security synchronization indication includes a serial number of a bearer for carrying a data packet.
  • the security synchronization indication is used to indicate that the user equipment performs data transmission with the first base station via the second security key, starting from sending and receiving the data packet.
  • the user equipment receives the security synchronization indication, which specifically includes:
  • the user equipment receives a radio resource control R R C reestablishment message sent by the first base station, where the RR C re-establishment message includes the security synchronization indication.
  • the security synchronization indication further includes a superframe number H F N of the bearer for identifying the bearer carrying the data packet.
  • the user equipment acquiring the indication information includes:
  • the second security key performs data transmission with the first base station.
  • the user equipment acquires the indication information, and the method includes: when the first base station fails to perform radio link or handover, the user equipment acquires the indication information.
  • the method further includes: the user equipment receiving the RRC After the message is re-established, the second security key is derived.
  • the first base station is a macro base station
  • the second base station is a micro base station.
  • the user equipment when the user equipment is disconnected from the first base station, the user equipment is maintained
  • the data transmission of the two base stations specifically includes:
  • the micro base station has a physical uplink control channel PUCC H.
  • PUCC H physical uplink control channel
  • the embodiment of the present invention further provides a communication method, including: the first base station performs data transmission with the user equipment and the second base station by using a first security key, where the first base station and the second base station are Carrier aggregation
  • the first base station disconnects from the user equipment, where data transmission is maintained between the user equipment and the second base station;
  • the first base station sends indication information to the user equipment, where the user equipment is instructed to perform data transmission with the first base station via a second security key.
  • the indication information includes a security synchronization indication, where the security synchronization indication includes a sequence number SN for carrying a bearer of the data packet;
  • the first base station performs data transmission with the user equipment by using the second security key, and specifically includes:
  • the first base station Starting from transceiving the data packet, the first base station via the second security key Data transmission with the user equipment.
  • the first base station by using the second security key, and the user, start from sending and receiving the data packet Before the device performs data transmission, the method further includes: the first base station sending a radio resource control RRC re-establishment message to the user equipment, where the RRC re-establishment message includes the security synchronization indication.
  • the secure synchronization indication further includes a superframe number HFN of the bearer for identifying the bearer carrying the data packet.
  • the indication information includes a protocol data unit of the packet data convergence protocol PDCP
  • the first base station performs data transmission with the user equipment by using the second security key, and specifically includes:
  • the first base station Starting from transceiving the PDU, the first base station performs data transmission with the user equipment via the second security key.
  • the first base station is disconnected
  • the connection with the user equipment includes:
  • the first base station When the first base station fails or switches a radio link, the first base station disconnects from the user equipment.
  • the first base station is a macro base station
  • the second base station is a micro base station.
  • an embodiment of the present invention provides another communication method, including: maintaining, by a user equipment, communication with a first base station and a second base station, where the first base station and the second base station are carrier aggregation; When determining that the first base station is handed over to the target base station, the user equipment sends a radio link control RL C status report to the second base station, where the second base station reports according to the RLC status, The first base station sends indication information to the target base station, so that the target base station determines retransmission data to the user equipment according to the indication information.
  • the method further includes: when the user equipment sends the RL C status report to the second base station, the user equipment starts a timing of the user equipment Device
  • the user equipment releases the configuration information of the first base station.
  • RL C status report which specifically includes:
  • the user equipment When the radio link fails between the user equipment and the first base station, the user equipment sends the RL C status report to the second base station;
  • the user equipment When the user equipment receives an R L C status reporting indication from the first base station, the user equipment sends the RL C status report to the second base station;
  • the user equipment sends the RL C status report to the second base station.
  • the first base station is a macro base station
  • the second base station is a micro base station.
  • the embodiment of the present invention further provides another communication method, including: the second base station maintains communication with the user equipment and the first base station, and the first base station and the second base station are carrier aggregation; The second base station receives a radio link control RLC status report from the user equipment, where the RLC status report is sent by the user equipment when determining that the first base station switches to a target base station;
  • the second base station sends indication information to the target base station via the first base station according to the RLC status report, so that the target base station determines retransmission data to the user equipment according to the indication information.
  • the receiving, by the second base station, the RLC status report from the user equipment specifically includes:
  • the second base station receives the RLC status report from the user equipment
  • the second base station When the user equipment receives an RLC status report indication from the first base station, the second base station receives the RLC status report from the user equipment; or
  • the second base station receives the RLC status report from the user equipment when the user equipment receives a handover command from the first base station and the second base station maintains an indication of the connection with the user equipment.
  • the indication information includes a packet data convergence protocol sequence J 'J number PDCP SN;
  • the sending, by the second base station, the indication information to the target base station by using the first base station according to the RLC status report specifically includes:
  • the first base station is a macro base station
  • the second base station is a micro base station.
  • an embodiment of the present invention provides a user equipment, including: a processing unit, configured to perform data transmission with the first base station and the second base station via the first security key, and maintain data with the second base station when the user equipment is disconnected from the first base station Transmission, the first base station and the second base station are carrier aggregation;
  • an obtaining unit configured to obtain indication information, to indicate that the processing unit performs data transmission with the first base station via a second security key.
  • the obtaining unit is specifically configured to receive a security synchronization indication
  • the security synchronization indication includes a serial number of a bearer for carrying a data packet.
  • the security synchronization indication is used to indicate that starting from transceiving the data packet, the processing unit performs data transmission with the first base station via the second security key.
  • the acquiring unit is further configured to receive a radio resource control RR C re-establishment message sent by the first base station, where the RR C re-establishment message includes the security synchronization indication.
  • the security synchronization indication received by the acquiring unit further includes a superframe number H F N of the bearer, and is used to identify the bearer that carries the data packet.
  • the acquiring unit is specifically configured to receive a protocol data unit PDU of a packet data convergence protocol PDCP sent by the first base station or the second base station, where the P DU is used to indicate that the P DU is sent and received,
  • the processing unit performs data transmission with the first base station via the second security key.
  • the acquiring unit is specifically configured to acquire the indication information when a radio link failure or handover occurs in the first base station.
  • the processing unit is further configured to: after the acquiring unit receives the RRC re-establishment message, derive the second security key.
  • a seventh possible implementation manner when the first base station is a macro base station, and the second base station is a micro base station: And when the user equipment is disconnected from the macro base station, maintaining a data transmission with the micro base station based on a physical uplink control channel PUCCH of the micro base station.
  • an embodiment of the present invention provides a base station, including:
  • a transmitting unit configured to perform data transmission with the user equipment and the second base station by using the first security key, where the base station and the second base station are carrier aggregation;
  • a processing unit configured to disconnect the user equipment, where data transmission is maintained between the user equipment and the second base station;
  • a sending unit configured to send, to the user equipment, indication information, to indicate that the transmitting unit performs data transmission with the base station by using a second security key.
  • the indication information includes a security synchronization indication, where the security synchronization indication includes a sequence number SN for carrying a bearer of the data packet;
  • the processing unit is specifically configured to perform data transmission with the user equipment via the second security key, starting from sending and receiving the data packet.
  • the sending unit is configured to send a radio resource control RRC re-establishment message to the user equipment, where the RRC re-establishment message includes the security synchronization indication.
  • the secure synchronization indication further includes a superframe number HFN of the bearer for identifying the bearer carrying the data packet.
  • the indication information includes a protocol data unit PDU of a packet data convergence protocol PDCP;
  • the processing unit is specifically configured to perform data transmission with the user equipment via the second security key, starting from sending and receiving the P DU.
  • the processing unit is specifically configured to disconnect the user equipment when the first base station fails or switches a radio link.
  • the base station is a macro base station, and the second base station is a micro base station.
  • an embodiment of the present invention further provides a user equipment, including: a processing unit, configured to maintain communication with a first base station and a second base station, where the first base station and the second base station are carrier aggregation;
  • a sending unit configured to: when determining that the first base station is handed over to the target base station, send a radio link control RLC status report to the second base station, where the second base station reports according to the RL C status,
  • the first base station sends indication information to the target base station, so that the target base station determines retransmission data to the user equipment according to the indication information.
  • the processing unit is further configured to: when the sending unit sends the RL C status report to the second base station, start a timer of the user equipment, and if the sending unit sends the RL C status If the timer of the user equipment expires, the configuration information of the first base station is released.
  • the sending unit is configured to: when the radio link fails between the user equipment and the first base station, send the RLC status report to the second base station; or Sending, by the user equipment, the RLC status report to the second base station, when the user equipment receives an RLC status report indication from the first base station;
  • an embodiment of the present invention further provides a base station, including:
  • a processing unit configured to maintain communication with the user equipment and the first base station, where the first base station and the base station are carrier aggregation;
  • a receiving unit configured to receive a radio link control RLC status report from the user equipment, where the RLC status report is sent by the user equipment when determining that the first base station switches to a target base station;
  • a sending unit configured to send indication information to the target base station by using the first base station according to the RLC status report received by the receiving unit, so that the target base station determines, according to the indication information, a weight to the user equipment Pass data.
  • the receiving unit is configured to: when the radio link fails between the user equipment and the first base station, receive the RLC status report from the user equipment; or
  • the indication information that is sent by the sending unit includes a packet data convergence protocol sequence number (PDCP SN);
  • PDCP SN packet data convergence protocol sequence number
  • the sending unit is specifically configured to receive according to the receiving unit
  • the RLC status report transmits the PDCP SN to the target base station via the first base station.
  • a processor configured to perform data transmission with the first base station and the second base station via the first security key, and maintain data with the second base station when the user equipment disconnects from the first base station Transmitting, and obtaining indication information, the indication information is used to instruct the processor to perform data transmission with the first base station by using a second security key, where the first base station and the second base station are carrier aggregation.
  • the user equipment further includes a receiver
  • the receiver is specifically configured to receive a security synchronization indication
  • the security synchronization indication includes a sequence number SN of a bearer for carrying a data packet, where the security synchronization indication is used to indicate that the processor starts to send and receive the data packet, and the processor uses the second security key to The first base station performs data transmission.
  • the receiver is specifically configured to receive a radio resource control RRC re-establishment message sent by the first base station, where the RRC re-establishment message includes the security synchronization indication.
  • the security synchronization indication received by the receiver further includes a superframe number HFN of the bearer, which is used to identify the bearer that carries the data packet.
  • the user equipment further includes a receiver
  • the receiver is configured to receive a protocol data unit PDU of a packet data convergence protocol PDCP sent by the first base station or the second base station, where the PDU is used to indicate that the processor starts
  • the second security key performs data transmission with the first base station.
  • the processor is specifically configured to: when the first base station fails to generate a radio link or cut In the event of a change, the indication information is obtained.
  • the processor is further configured to derive the second security key after the receiver receives the RRC re-establishment message.
  • a seventh possible implementation when the first base station is a macro base station, and the second base station is a micro base station: When the user equipment is disconnected from the macro base station, the physical uplink control channel PUCC H of the micro base station maintains data transmission with the micro base station.
  • the embodiment of the present invention further provides a base station, including:
  • a processor configured to perform data transmission with the user equipment and the second base station via the first security key, and disconnect the user equipment, where the data transmission is maintained between the user equipment and the second base station
  • the base station and the second base station are carrier aggregation;
  • a transmitter configured to send indication information to the user equipment, to instruct the processor to perform data transmission with the base station via a second security key.
  • the indication information includes a security synchronization indication, where the security synchronization indication includes a sequence number SN for carrying a bearer of the data packet;
  • the processor is specifically configured to perform data transmission with the user equipment via the second security key, starting from sending and receiving the data packet.
  • the transmitter is configured to send an RRC re-establishment message to the user equipment, where the RRC re-establishment message includes the security synchronization indication.
  • the security synchronization indication further includes a superframe number HFN of the bearer, which is used to identify the bearer. Said bearer of the data packet.
  • the indication information includes a protocol data unit P DU of the packet data convergence protocol P DC P ;
  • the processor is specifically configured to start data transmission with the user equipment by using the second security key, starting from sending and receiving the P D U.
  • the processor is specifically configured to disconnect the user equipment when the first base station fails or switches the radio link.
  • the base station is a macro base station, and the second base station is a micro base station.
  • an embodiment of the present invention further provides a user equipment, including: a processor, configured to maintain communication with a first base station and a second base station, where the first base station and the second base station are carrier aggregation;
  • a transmitter configured to: when determining that the first base station switches to a target base station, send a radio link control RL C status report to the second base station, where the second base station reports, according to the RLC status,
  • the first base station sends indication information to the target base station, so that the target base station determines retransmission data to the user equipment according to the indication information.
  • the processor is further configured to: when the transmitter sends the RL C status report to the second base station, start a timer of the user equipment, and if the sender sends the RL C status If the timer of the user equipment expires, the configuration information of the first base station is released.
  • the transmitter is specifically configured to send the RL C status report to the second base station when a radio link failure occurs between the user equipment and the first base station;
  • an embodiment of the present invention provides a base station, including:
  • a processor configured to maintain communication with the user equipment and the first base station, where the first base station and the base station are carrier aggregation;
  • a receiver configured to receive a radio link control R L C status report from the user equipment, where the RL C status report is sent by the user equipment when determining that the first base station switches to a target base station;
  • a transmitter configured to send, by using the first base station, indication information to the target base station according to the RL C status report received by the receiver, so that the target base station determines, according to the indication information, the user equipment Retransmit the data.
  • the receiver is configured to receive the RL C status report from the user equipment when a radio link fails between the user equipment and the first base station;
  • the indication information sent by the transmitter includes a packet data convergence protocol serial number
  • the transmitter is specifically configured to send the PDCP SN to the target base station by using the first base station according to the RLC status report received by the receiver.
  • An embodiment of the present invention provides a communication method and apparatus, where data transmission is performed by a user equipment with a first base station and a second base station via a first security key, where the first base station and the second base station are carrier aggregation, and when the user When the device is disconnected from the first base station, the user equipment maintains data transmission with the second base station, and the user equipment acquires the indication information, and is used to indicate that the user equipment performs data transmission with the first base station via the second security key.
  • the user equipment may continue to maintain data transmission with the second base station.
  • the user equipment may perform data transmission with the first base station according to the indication information, thereby ensuring the maximum between the user equipment and the base station in the carrier aggregation scenario. The continuity of data transmission.
  • FIG. 1 is a flowchart 1 of a communication method according to an embodiment of the present invention.
  • FIG. 2 is a second flowchart of a communication method according to an embodiment of the present invention.
  • FIG. 3 is a flowchart 1 of another communication method according to an embodiment of the present invention
  • FIG. 4 is a flowchart 2 of another communication method according to an embodiment of the present invention
  • FIG. Method flow chart three is a flowchart 1 of another communication method according to an embodiment of the present invention.
  • FIG. 6 is a third flowchart of another communication method according to an embodiment of the present invention
  • FIG. 7 is a flowchart 4 of another communication method according to an embodiment of the present invention
  • FIG. 8 is a flowchart 1 of still another communication method according to an embodiment of the present invention
  • FIG. 9 is a flowchart 2 of still another communication method according to an embodiment of the present invention
  • FIG. 11 is a schematic structural diagram 1 of a user equipment according to an embodiment of the present invention
  • FIG. 12 is a schematic structural diagram 1 of a base station according to an embodiment of the present invention
  • FIG. 13 is a schematic structural diagram 2 of a user equipment according to an embodiment of the present invention
  • FIG. 14 is a schematic structural diagram 2 of a base station according to an embodiment of the present disclosure
  • FIG. 15 is a schematic structural diagram 3 of a base station according to an embodiment of the present disclosure.
  • FIG. 16 is a schematic structural diagram 4 of a base station according to an embodiment of the present disclosure.
  • FIG. 17 is a schematic structural diagram 5 of a base station according to an embodiment of the present disclosure.
  • FIG. 18 is a schematic structural diagram 3 of a user equipment according to an embodiment of the present invention
  • FIG. 19 is a schematic structural diagram 6 of a base station according to an embodiment of the present disclosure
  • FIG. 20 is a schematic structural diagram 7 of a base station according to an embodiment of the present disclosure.
  • 21 is a block diagram 1 of a communication system according to an embodiment of the present invention.
  • FIG. 22 is a second block diagram of a communication system according to an embodiment of the present invention.
  • GSM Global System for Mobile Communications
  • CDMA Code Division Multiple Access
  • Time Division Multiple Access Time Division Multiple Access
  • WCDMA Wideband Code Division Multiple Access
  • Orthogonal Frequency-Division Multiple Access OFDM
  • SC-FDMA single carrier frequency division multiple address
  • GPRS General Packet Radio Service
  • LTE Long Term Evolution
  • the user equipment which may be a wireless terminal or a wired terminal, may be a device that provides voice and/or data connectivity only to the user, a handheld device with wireless connectivity, or other processing device connected to the wireless modem.
  • the wireless terminal can communicate with one or more core networks via a radio access network (eg, RAN, Radio Access Network), which can be a mobile terminal, such as a mobile phone (or "cellular" phone) and with a mobile terminal
  • RAN Radio Access Network
  • the computers for example, can be portable, pocket-sized, handheld, computer-integrated or in-vehicle mobile devices that exchange language and/or data with the wireless access network.
  • a wireless terminal may also be called a system, a subscriber unit (Subscriber Unit), a subscriber station (Subscriber Station), a mobile station (Mobile Station), a mobile station (Mobile), a remote station (Remote Station), an access point (Access Point). , Remote Terminal, Access Terminal, User Terminal, User Agent or User Equipment.
  • the embodiment of the present invention provides a communication method, which is related to the user equipment side. As shown in FIG. 1 , the method may include:
  • the user equipment performs data transmission with the first base station and the second base station by using a first security key, where the first base station and the second base station are carrier aggregation.
  • the first base station and the second base station are base stations for performing carrier aggregation, and the first base station and the second base station perform data transmission with the user equipment.
  • the user equipment When the user equipment performs normal communication with the first base station and the second base station, the user equipment may perform data transmission with the first base station and the second base station via the first security key, so as to ensure data transmission security, where
  • the security key is a security key used when the user equipment performs data transmission with the first base station and the second base station. 51 02.
  • the user equipment When the user equipment is disconnected from the first base station, the user equipment maintains data transmission with the second base station.
  • the user equipment When the user equipment is disconnected from the first base station, the user equipment can continue to maintain data transmission with the second base station. For example, when the second base station has a PUCCH (Physical Uplink Control), even if the first base station is disconnected from the user equipment, the second base station may perform the user equipment with the PUCCH. data transmission.
  • PUCCH Physical Uplink Control
  • a person skilled in the art can understand that when the user equipment is disconnected from the first base station, communication between the user equipment and the second base station and between the first base station and the second base station is not affected, that is, the user equipment.
  • Data can be normally transmitted between the first base station and the second base station and between the first base station and the second base station.
  • the user equipment will continue to maintain data transmission with the second base station to ensure continuity of data transmission.
  • the user equipment may continue to transmit data between the user equipment and the second base station by using the second base station; or, the user equipment may continue to transmit the user equipment by using the second base station.
  • Data between the first base stations and between the user equipment and the second base station to ensure continuity of data transmission.
  • the first base station provided by the embodiment of the present invention may be a macro base station, and the second base station may be a micro base station; or the first base station may be a micro base station, and the second base station may be a macro base station, which is not limited by the present invention.
  • the user equipment can be maintained and the other device regardless of whether the user equipment and the macro base station are disconnected or disconnected from the micro base station.
  • the data transmission of the base station ensures the continuity of data transmission.
  • the carrier aggregation between the macro base station and the micro base station provided by the embodiment of the present invention is a typical scenario of carrier aggregation between base stations.
  • the macro base station may refer to a primary base station having a control function in carrier aggregation between base stations; the micro base station is a secondary base station that transmits parameters and data.
  • the user equipment acquires the indication information, and is used to indicate that the user equipment performs data transmission with the first base station via the second security key.
  • the user equipment detects that the user equipment is disconnected from the first base station, the user equipment initiates an RRC (Radio Resource Control) re-establishment procedure to re-establish an RRC connection with the first base station.
  • RRC Radio Resource Control
  • the first base station receives the RRC re-establishment request message sent by the user equipment, if the first base station verifies and grants the request message, the first base station sends an RRC re-establishment message corresponding to the request message to the user equipment to interact with the user.
  • the RRC connection is re-established between the devices.
  • the first base station when the first base station re-establishes the RRC connection with the user equipment, the first base station can simultaneously send the indication information to the user equipment, so as to use The user equipment is instructed to perform data transmission with the first base station via the second security key.
  • the macro base station may send an indication message to the user equipment by using an RRC re-establishment message to enable the user to
  • the device derives the second security key according to the indication message; correspondingly, the macro base station or the ⁇ base station may also send the indication information to the user through a PDU (Protocol Data Unit) of the PDCP (Packet Data Convergence Protocol) The device, so that the user equipment derives the second security key according to the indication message.
  • PDU Protocol Data Unit
  • PDCP Packet Data Convergence Protocol
  • the micro base station may send an indication message to the user equipment by using an RRC re-establishment message, so that the user equipment according to the indication message Deriving a second security key; correspondingly, the macro base station or the micro base station may send an indication message to the user equipment through the PDU of the PDCP, so that the user equipment derives the second security key according to the indication message.
  • the RRC re-establishment procedure between the user equipment and the first base station is accompanied by the update of the security key, that is, the first base station completes the RRC re-establishment procedure, and the first base station or the second base station sends a corresponding indication message to the user equipment.
  • the user equipment derives the corresponding security key according to the indication message, that is, the second security key
  • the first base station also derives the corresponding second security key, so far, along with the RRC re-establishment process, the user equipment and the A base station has updated the first security key to a second security key in order to ensure the security and continuity of subsequent data transmissions.
  • the user equipment may derive a second security key according to the indication information, and perform data transmission with the first base station via the second security key, that is, the user equipment recovers data transmission with the first base station.
  • the user equipment can perform security synchronization with the first base station, and the user equipment can also perform security synchronization with both the first base station and the second base station.
  • the first base station may send the indication information to the user equipment to complete security synchronization with the user equipment, so that the first base station and the user equipment can be used.
  • the second security key performs data transmission; or, if the user equipment and the first base station and the second base station need to perform security synchronization, the first base station may send the indication information to the user equipment and the second base station to cooperate with the user equipment.
  • the first base station can control the user equipment and the micro base station to derive a second security key by sending indication information to the user equipment and the micro base station, so that the macro base station and the user equipment are The second security key is used for data transmission between the micro base station and the user equipment, between the macro base station and the micro base station.
  • the user equipment may perform data transmission by using the second security key to re-establish an RRC connection between the user equipment and the first base station.
  • the user equipment can continue the data transmission with the second base station via the second security key, thereby completing the secure transmission of the data and ensuring the continuity of the data transmission.
  • the user equipment when the user equipment is disconnected from the first base station, the user equipment may continue to maintain data transmission with the second base station, when the RRC connection between the user equipment and the first base station is re-established, and the user equipment and the user equipment After the security synchronization is completed between the base station and the second base station, the second device after the security synchronization can be used between the user equipment and the first base station, between the user equipment and the second base station, and between the first base station and the second base station.
  • the security key encrypts and decrypts the data packet, thereby completing the secure transmission of the data, thereby ensuring the continuity of the data transmission.
  • the data is divided into Multiple data packets, and the multiple data packets are sequentially transmitted.
  • the micro base station may not update the first security key, because the micro base station does not need to encrypt and decrypt data that the user equipment needs to transmit to the macro base station, The data to be transmitted by the received user equipment to the macro base station needs to be forwarded to the macro base station.
  • the embodiment of the present invention further provides a communication method, which is related to the first base station side. As shown in FIG. 2, the method may include:
  • the first base station performs data transmission with the user equipment and the second base station by using the first security key, where the first base station and the second base station are carrier aggregation.
  • the first base station When the first base station performs normal communication with the user equipment and the second base station, the first base station performs data transmission with the user equipment and the second base station via the first security key, where the first base station and the second base station are base stations for performing carrier aggregation. .
  • the first base station disconnects from the user equipment, and the data transmission is maintained between the user equipment and the second base station.
  • the user equipment can continue to maintain data transmission with the second base station. This is because the second base station has a PUCCH and can bear data transmission with the user equipment.
  • the first base station is disconnected from the user equipment, it does not affect the user equipment and the second base station, and the first base station and Data transmission between the second base stations.
  • S2 03 The first base station performs data transmission with the user equipment by using the second security key, where the second security key is obtained by the user equipment according to the obtained indication information.
  • the RRC connection is completed between the first base station and the user equipment.
  • the first base station may perform data transmission with the user equipment by using the updated second security key, where the second security key is obtained after the user equipment obtains the indication information, according to the indication information.
  • the indication information is used to indicate that the user equipment performs data transmission with the first base station via the updated second security key, that is, restores secure data transmission between the user equipment and the first base station.
  • An embodiment of the present invention provides a communication method, where data transmission is performed by a user equipment with a first base station and a second base station by using a first security key, where the first base station and the second base station are carrier aggregation, and when the user equipment is When a base station is disconnected, the user equipment maintains data transmission with the second base station, and the user equipment acquires indication information, which is used to indicate that the user equipment performs data transmission with the first base station via the second security key.
  • the user equipment may continue to maintain data transmission with the second base station.
  • the user equipment may perform data transmission with the first base station according to the indication information, thereby ensuring the maximum between the user equipment and the base station in the carrier aggregation scenario.
  • the continuity of data transmission when the user equipment performs data transmission with the first base station and the second base station by using a first security key, where the first base station and the second base station are carrier aggregation, and when the user equipment is When a base station is disconnected, the user equipment maintains data transmission with the second base
  • the embodiment of the present invention provides another communication method, which is related to the user equipment side. As shown in FIG. 3, the method may include:
  • the user equipment maintains communication with the first base station and the second base station, and the first base station and the second base station are carrier aggregation.
  • the first base station and the second base station are base stations for performing carrier aggregation, and the first base station and the second base station perform data transmission with the user equipment.
  • the user equipment Normally, the user equipment maintains communication with the first base station and the second base station, that is, data transmission between the user equipment and the first base station and the second base station.
  • the first base station and the second base station provided by the embodiment of the present invention may both be a macro base station; or the first base station is a macro base station, and the second base station is a micro base station; or the first base station is a micro base station, and the second base station is a second base station.
  • the macro base station, the present invention is not limited.
  • the user equipment sends an RLC (Radio L i nk Con trol) status 4 report to the second base station, where the second base station is configured according to the RL C state. Reporting, sending indication information to the target base station via the first base station, so that the target base station determines retransmission data to the user equipment according to the indication information.
  • RLC Radio L i nk Con trol
  • the user equipment may send an RL C status report to the second base station, where the RLC status report may indicate the user equipment and the second base station.
  • the state of data transfer between After the second base station sends the RLC status report to the first base station, the first base station converts the RLC status report into indication information, and sends the indication information to the target base station, so that the target base station can determine the user according to the indication information.
  • the device retransmits the data, so that when the first base station switches to the target base station, the continuity of the data transmission can be ensured, thereby achieving the purpose of lossless handover.
  • the first base station is a base station that communicates with the user equipment before the handover
  • the target base station is a base station that communicates with the user equipment after the handover.
  • the embodiment of the present invention further provides another communication method, involving the second base station side. As shown in FIG. 4, the method may include:
  • the second base station maintains communication with the user equipment and the first base station, where the first base station and the second base station are carrier aggregation.
  • the second base station maintains communication with the user equipment and the first base station, where the first base station and the second base station are base stations for performing carrier aggregation.
  • the second base station receives an RLC status report from the user equipment, where the RLC status report is sent by the user equipment when determining that the first base station switches to the target base station.
  • the user equipment When the user equipment receives the handover command of the first base station, that is, the first base station needs to be handed over to the target base station, the user equipment sends an RLC status report to the second base station, that is, the second base station receives the RLC status report from the user equipment, where The RLC status report may indicate the status of data transmission between the user equipment and the second base station.
  • the second base station sends the indication information to the target base station via the first base station according to the RLC status report, so that the target base station determines the retransmission data to the user equipment according to the indication information.
  • the second base station After the second base station receives the RLC status report from the user equipment, the second base station forwards the RLC status report to the first base station, so that the first base station converts the RLC status report into corresponding indication information, and the indication information is Sending to the target base station, so that the target base station determines retransmission data to the user equipment according to the indication information.
  • the first base station is configured to communicate with the user equipment before the handover, so that the first base station can learn the status of the data transmission between the user equipment and the first base station in real time, and the first base station needs to switch to the target base station.
  • the first base station can directly connect the first base station
  • the RL C status report is converted into indication information, and the indication information is sent to the target base station, so that the target base station determines retransmission data to the user equipment according to the indication information.
  • the second base station may send the corresponding indication information to the target base station according to the RL C status report reported by the user equipment, so that the target base station can learn the user equipment and the second base station according to the indication information.
  • the status of the data transmission between the two thereby determining the retransmission data to the user equipment.
  • the embodiment of the present invention provides another communication method, where the user equipment maintains communication with the first base station and the second base station, the first base station and the second base station are carrier aggregation, and when determining that the first base station switches to the target base station, the user equipment Sending, to the second base station, an RLC status report, where the second base station sends the indication information to the target base station via the first base station according to the RLC status report, so that the target base station determines the retransmission data to the user equipment according to the indication information.
  • the user equipment may send the RL C status report to the second base station, so that the second base station sends an indication to the target base station via the first base station according to the RL C status report.
  • the information is so that the target base station can determine the retransmission data to the user equipment according to the indication information, thereby maximizing the continuity of data transmission between the user equipment and the base station in the carrier aggregation scenario.
  • the embodiment of the present invention provides a communication method, which is a detailed description of a communication method provided in Embodiment 1. As shown in FIG. 5, the method may include:
  • the user equipment performs data transmission with the first base station and the second base station via the first security key, where the first base station and the second base station are carrier aggregation.
  • the first base station and the second base station are base stations for performing carrier aggregation, and the first base station and the second base station perform data transmission with the user equipment.
  • the user equipment When the user equipment performs normal communication with the first base station and the second base station, the user equipment may perform data transmission with the first base station and the second base station via the first security key, so as to ensure data transmission security, where
  • the security key is a security key used when the user equipment performs data transmission with the first base station and the second base station.
  • the user equipment When the user equipment is disconnected from the first base station, the user equipment can continue to maintain data transmission with the second base station because the second base station has PUC CH and can undertake data transmission with the user equipment.
  • a person skilled in the art can understand that when the user equipment is disconnected from the first base station, communication between the user equipment and the second base station and between the first base station and the second base station is not affected, that is, the user equipment.
  • Data can be normally transmitted between the first base station and the second base station and between the first base station and the second base station.
  • the user equipment will continue to maintain data transmission with the second base station to ensure continuity of data transmission.
  • the user equipment may continue to transmit data between the user equipment and the second base station by using the second base station; or, the user equipment may continue to transmit the user equipment by using the second base station.
  • Data between the first base stations and between the user equipment and the second base station to ensure continuity of data transmission.
  • the first base station provided by the embodiment of the present invention may be a macro base station, and the second base station may be a micro base station; or the first base station may be a micro base station, and the second base station may be a macro base station, which is not limited by the present invention.
  • the user equipment can maintain data transmission with another base station regardless of whether the user equipment and the macro base station are disconnected or disconnected from the micro base station. Guarantee the continuity of data transmission. Specifically, when the user equipment disconnects from the macro base station, the user equipment can maintain data transmission with the micro base station based on the PUCCH of the micro base station.
  • the carrier aggregation between the macro base station and the micro base station provided by the embodiment of the present invention is a typical scenario of carrier aggregation between base stations.
  • the macro base station may refer to a primary base station having a control function in carrier aggregation between base stations; the micro base station is a secondary base station that transmits parameters and data.
  • the user equipment sends an RRC re-establishment request message to the first base station.
  • the user equipment When the user equipment detects that the user equipment is disconnected from the first base station, the user equipment initiates an RRC re-establishment procedure, that is, the user equipment sends an RRC re-establishment request message to the first base station.
  • the user equipment is initiating an RRC re-establishment process, that is, before the user equipment sends the RRC re-establishment request message to the first base station, the corresponding processing that the user equipment needs to perform may include:
  • the user equipment starts a timer of the user equipment; the user equipment suspends the bearer of the first base station and retains the bearer of the second base station for data transmission; the user equipment resets the MAC of the first base station (Media Access Control, media access control 'J)
  • the user equipment retains configuration information of the secondary cell of the second base station; the user equipment uses default physical layer configuration information, default semi-persistent scheduling configuration information, and default MAC layer master configuration information between the user equipment and the first base station.
  • the user equipment selects any cell of the first base station, where any cell of the first base station may be any one of the first base stations, that is, any cell of the first base station may be in the cell of the first base station
  • the cell disconnected between the user equipments may also be other cells of the first base station.
  • the bearer of the first base station is a data transmission channel between the user equipment and the first base station; and the bearer of the second base station for data transmission is a data transmission channel between the user equipment and the second base station.
  • Resetting the MAC may include initializing the logical channel, stopping all timers, and setting all NDI (New Data Indicator) of the upstream HARQ (Hybrid Automatic Repeat Req uest) process to 0; Random access; clear message 3 (that is, the random access procedure is used to transmit a C-RNTI (Cel-Radio Network Temporary Identifier) MAC control unit or a common control channel SDU (Service Data Unit, Cache of message data); stop SR (Scheduling Request), BSR (Buffer Status Request) and PHR (Power Headroom Report) processes; clear all DLs (Down Link, downlink) HARQ cache; release temporary C-RNTI.
  • C-RNTI Codel-Radio Network Temporary Identifier
  • the first base station side also detects that the user equipment is disconnected from the first base station.
  • the corresponding processing that the first base station needs to perform may include: For the bearer only in the first base station, the first base station reuses the existing user plane protocol; for the bearers both the first base station and the second base station, the first base station only resets the MAC entity of the first base station; Release the configuration information of the secondary cell of the first base station, and retain the configuration information of the second base station; RLF (Radio Link Failure) caused by the failure of the integrity protection check needs to suspend the SRB (S i gna 1 Ra dio Bearer, signaling radio bearer) configuration; the first base station starts the timer of the first base station.
  • SRB S i gna 1 Ra dio Bearer, signaling radio bearer
  • the bearer that is only available in the first base station may be processed according to an existing user plane protocol, that is, all bearers of the first base station are suspended, the MAC is reset, the default physical layer configuration information, and the default semi-persistent scheduling configuration information are used. And default MAC layer master configuration information.
  • the first base station may send a bearer configuration message to the second base station, so as to send the bearer data on the second base station.
  • the first base station sends an RRC re-establishment message corresponding to the RRC re-establishment request message to the user equipment, to re-establish an RRC connection with the user equipment.
  • the first base station When the first base station receives the RRC re-establishment request message sent by the user equipment, if the first base station verifies and grants the RRC re-establishment request message, the first base station sends an RRC re-establishment message corresponding to the RRC re-establishment request message to The user equipment re-establishes an RRC connection with the user equipment.
  • the user equipment may determine whether to stop data transmission with the second base station according to the RRC re-establishment state.
  • the user equipment receives the RRC re-establishment rejection message from the first base station, the timer of the user equipment expires, or the first base station selected by the user equipment
  • the configuration information of the user equipment is not saved in any cell, and the user equipment stops data transmission with the second base station, and releases configuration information of the secondary cell of the second base station.
  • the user equipment deletes the configuration information of the second base station, that is, stops data transmission with the second base station, where the first base station is first.
  • the cell in which the cell is the first base station is different from the cell disconnected from the user equipment. Area.
  • the first base station deletes Configuration information of the second base station.
  • the first base station does not allow the RRC re-establishment request message to be: the first base station sends an RRC re-establishment reject message to the user equipment, so that after the user equipment receives the RRC re-establishment rejection message, the user equipment stops between the second base station and the second base station. Perform data transmission, and release configuration information of the secondary cell of the second base station.
  • the user equipment acquires the indication information, and is used to indicate that the user equipment performs data transmission with the first base station by using the second security key.
  • the user equipment acquires indication information, where the indication information is used to indicate that the user equipment performs data transmission with the first base station via the second security key.
  • the first base station or the second base station may simultaneously send the indication information to the user.
  • a device configured to instruct the user equipment to perform data transmission with the first base station via the second security key.
  • the macro base station may send an indication message to the user equipment by using an RRC re-establishment message to enable the user to The device derives the second security key according to the indication message.
  • the micro base station may also send the indication information to the user equipment through the PDU of the PDCP, so that the user equipment derives the second security key according to the indication message.
  • the micro base station may send an indication message to the user equipment by using an RRC re-establishment message, so that the user equipment according to the indication message Deriving a second security key; correspondingly, the macro base station may send an indication message to the user equipment through the PDU of the PDCP, so that the user equipment derives the second security key according to the indication message.
  • the RRC re-establishment procedure between the user equipment and the first base station is accompanied by the update of the security key, that is, the first base station completes the RRC re-establishment procedure, and the first base station or the second base station sends a corresponding indication message to the user equipment.
  • the security key that is, the first base station completes the RRC re-establishment procedure
  • the first base station or the second base station sends a corresponding indication message to the user equipment.
  • the message is derived from the corresponding security key, that is, the second security key
  • the first base station also derives the corresponding second security key. So far, along with the RRC re-establishment procedure, the user equipment and the first base station have the first security.
  • the key is updated to a second security key to ensure the security and continuity of subsequent data transmissions.
  • the indication information may include a security synchronization indication or a PDCP PDU.
  • the user equipment may derive a second security key according to the indication information, and perform data transmission with the first base station via the second security key, that is, the user equipment resumes data transmission with the first base station.
  • the user equipment after the user equipment performs security synchronization with the first base station, that is, the second security key is used for data transmission between the user equipment and the first base station, and the user equipment and the second base station may also perform security synchronization.
  • the first base station may simultaneously send the indication information to the second base station, so that the second base station may also update the first security key according to the indication information.
  • a second security key to complete the security synchronization; or, if the second base station sends the indication information to the user equipment, the second base station can simultaneously send the indication information to the first base station, so that the first base station can also The indication information updates the first security key to the second security key, thereby completing the secure synchronization.
  • the user equipment may perform the RRC connection established between the user equipment and the first base station via the second security key. Data transmission; at the same time, the user equipment can continue the data transmission with the second base station via the second security key, thereby completing the secure transmission of the data and ensuring the continuity of the data transmission.
  • the user equipment when the user equipment is disconnected from the first base station, the user equipment may continue to maintain data transmission with the second base station, when the RRC connection between the user equipment and the first base station is re-established, and the user equipment and the user equipment After the security synchronization is completed between the base station and the second base station, the second device after the security synchronization can be used between the user equipment and the first base station, between the user equipment and the second base station, and between the first base station and the second base station.
  • the security key encrypts and decrypts the data packet, thereby completing the secure transmission of the data, thereby ensuring the continuity of the data transmission. It can be understood that, in the data transmission process, in general, the data is divided into a plurality of data packets, and the plurality of data packets are sequentially transmitted separately.
  • the micro base station may not update the first security key, because the micro base station does not need to encrypt and decrypt data that the user equipment needs to transmit to the macro base station, The data to be transmitted by the received user equipment to the macro base station needs to be forwarded to the macro base station.
  • the user equipment may obtain the indication information.
  • the scenario in which the first base station fails or switches the radio link may include:
  • the user equipment detects the maximum number of retransmissions of the DRB (Data Radio Bearer) or SRB that the first base station transmits to the RLC.
  • DRB Data Radio Bearer
  • the user equipment detects that the first base station fails to handover.
  • the method for the user equipment to obtain the indication information may be one of the following: (1) the user equipment receives the security synchronization indication, where the security synchronization indication includes the SN (Sequence Number) of the bearer used to carry the data packet.
  • the security synchronization indication may be used to indicate that the user equipment performs data transmission with the first base station via the second security key, starting from transceiving the data packet.
  • the user equipment receives the PDU of the PDCP sent by the first base station or the second base station, and the PDU is used to indicate that the user equipment performs data transmission with the first base station via the second security key, starting from receiving and transmitting the PDU.
  • the user equipment may receive the security synchronization indication by receiving the RRC re-establishment message sent by the first base station, that is, the RRC re-establishment message includes the security synchronization indication.
  • the security synchronization indication may further include a HFN (Hyper Frame Number) of the bearer, where the HFN of the bearer may be used to identify the bearer carrying the data packet.
  • HFN Hexaper Frame Number
  • the user equipment may derive the second security key according to the security synchronization indication carried in the RRC re-establishment message.
  • the first base station may indicate, by using a user plane mechanism, such as a PDU header of the PDCP, a data packet using the second security key, so that the user equipment starts from receiving and transmitting the PDU, and is sent through the second security secret.
  • the key is transmitted with the first base station for data transmission.
  • the method for the first base station to indicate the data packet using the second security key by using the PDU header may include:
  • the first base station can use the reserved bits of the existing User Plane Data PDU to indicate the data packet using the second security key.
  • the D/C bit can be used to indicate whether the PDU is a control PDU or a data PDU, if " 0", it is represented as a control PDU. If it is "1", it is represented as a data PDU; R is a reserved bit; PDCP SN is the serial number of the data PDU, and Data is data. It can be seen from Table 1 that the existing user plane data PDU has three reserved bits, and one of them can be used to identify a new security activation indication. After the user equipment receives the data PDU of the first base station, the user equipment can use the data according to the data.
  • the new security activation indication in the PDU derives the second security key, and according to the second security key, the second security key is used for encryption and decryption starting from the SDU of the PDCP. Since the data PDU header is not encrypted, the user equipment and the first base station can explicitly know the PDCP SN at which the second security key starts.
  • SC Security Control
  • the transmitting PDCP layer and the receiving PDCP layer start data from the data PDU.
  • the packet is encrypted and decrypted by using the second security key, and specifically includes:
  • the transmitting end PDCP layer encrypts the data packet by using the second security key, and adds an SC indication as shown in Table 1 to the data PDU header; the receiving end PDCP layer reads the SC indication from the data PDU header, and knows from the The data packet begins to use the second security key, so that the receiving end PDCP layer decrypts the data packet using the second security key.
  • Table 2
  • the first base station can construct a new type of Control PDU to indicate the data packet using the second security key.
  • the PDU includes a data PDU and a control PDU, wherein the data PDU can be used to transmit the SN of the SDU of the PDCP and related data; the control PDU can be used to transmit control information of the PDCP PDU, such as a PDU status report and PDU header compression control information.
  • the D/C bit can be used to indicate whether the PDU is a control PDU or a data PDU. If it is "0", it is represented as a control PDU. If it is "1", it is represented as a data PDU; R is a reserved bit; FSC ( First New Security, a new security indication) A PDCP SN or Count value used to indicate that the SDU of the PDCP starts to use the second security key; the PDU Type can be used to indicate the type of the control PDU.
  • FSC First New Security, a new security indication
  • 3-bit Control PDU Type can be expanded to the form shown in Table 4.
  • the user equipment when the user equipment is disconnected from the first base station, the user equipment can continue to maintain data transmission with the second base station, and update the security in the process of re-establishing the RRC connection. Key, thus re-establishing After the RRC connection between the user equipment and the first base station, the user equipment can perform data transmission with the first base station by using the updated second security key, thereby ensuring continuity of data transmission.
  • An embodiment of the present invention provides a communication method, where data transmission is performed by a user equipment with a first base station and a second base station by using a first security key, where the first base station and the second base station are carrier aggregation, and when the user equipment is When a base station is disconnected, the user equipment maintains data transmission with the second base station, and the user equipment acquires indication information, which is used to indicate that the user equipment performs data transmission with the first base station via the second security key.
  • the user equipment may continue to maintain data transmission with the second base station.
  • the user equipment may perform data transmission with the first base station according to the indication information, thereby ensuring the maximum between the user equipment and the base station in the carrier aggregation scenario.
  • the continuity of data transmission when the user equipment performs data transmission with the first base station and the second base station by using a first security key, where the first base station and the second base station are carrier aggregation, and when the user equipment is When a base station is disconnected, the user equipment maintains data transmission with the second base
  • the embodiment of the present invention provides another communication method, which is a further detailed description of another communication method provided by the first embodiment, corresponding to the communication method of the downlink data sent by the first base station to the user equipment, as shown in FIG.
  • the method can include:
  • the user equipment maintains communication with the first base station and the second base station, and the first base station and the second base station are carrier aggregation.
  • the first base station and the second base station are base stations for performing carrier aggregation, and the first base station and the second base station perform data transmission with the user equipment.
  • the user equipment Normally, the user equipment maintains communication with the first base station and the second base station, that is, data transmission between the user equipment and the first base station and the second base station.
  • the first base station and the second base station provided by the embodiment of the present invention may both be a macro base station; or the first base station is a macro base station, and the second base station is a micro base station; or the first base station is a micro base station, and the second base station is a second base station.
  • the macro base station, the present invention is not limited.
  • the user equipment may send an RL C status report to the second base station, where The RLC status report may indicate the status of data transmission between the user equipment and the second base station.
  • the first base station is a base station that communicates with the user equipment before the handover
  • the target base station is a base station that communicates with the user equipment after the handover.
  • the scenario in which the user equipment sends the RLC status report to the second base station may be one of the following:
  • the user equipment may send an RLC status report to the second base station.
  • the user equipment may send an RLC status report to the second base station.
  • the user equipment may send an RLC status report to the second base station.
  • the scenario in which the radio link fails between the user equipment and the first base station may be one of the following:
  • the user equipment detects that the RB or SRB transmitted by the first base station reaches the maximum number of retransmissions of the RLC.
  • the user equipment detects that the first base station fails to handover.
  • the first base station when the first base station sends a handover command to the user equipment, the first base station sends the handover command to the user equipment, and the first base station sends the RLC status. After reporting the indication to the user equipment, the first base station may initiate a timer of the first base station for timing in the process of transmitting the RLC status report.
  • the RLC status reporting indication may indicate a separate bearer between the user equipment and the first base station, and may also indicate a bearer of all AM (Acknowledged Mode) modes, which is not limited by the present invention.
  • AM Acknowledged Mode
  • the user equipment when the user equipment sends the RLC status report to the second base station, the user equipment may also start a timer of the user equipment, so as to send the RLC status in the user equipment. Timed in the process of obituary.
  • the second base station forwards the RLC status report to the first base station.
  • the second base station After receiving the RLC status report sent by the user equipment, the second base station forwards the RLC status report to the first base station.
  • the first base station converts the RLC status report into indication information.
  • the first base station After receiving the RLC status report forwarded by the second base station, the first base station converts the RL C status report into the indication information.
  • the indication information after the first base station is converted may include a PDCP S N value.
  • the second base station forwards the RLC status report to the first base station for a certain period of time, and the first base station converts the RL C status report into a PDCP SN value. That is, the PDU header of the PDCP of the RL C is removed, and the PDCP PDU is converted into the SDU of the PDCP, so that the PDCP SN value is read from the SDU header of the PDCP.
  • the first base station sends the indication information to the target base station.
  • the first base station After the first base station converts the RL C status report into the indication information, the first base station sends the indication information to the target base station, and sends the read PDCP SN value to the target base station, so that the target base station can determine according to the PDCP SN value. Retransmit data to the user device.
  • the target base station determines retransmission data to the user equipment according to the indication information. After the target base station receives the indication information sent by the first base station, that is, the PDCP SN value, the target base station may determine, according to the PDCP SN value, retransmission data to the user equipment, so that when the first base station switches to the target base station, the data can be guaranteed.
  • the continuity of the transmission in order to achieve the purpose of lossless switching.
  • the first base station after the timer of the first base station times out, the first base station has not received the RLC status report of the second base station, and the first base station can directly convert the RL C status report of the first base station itself into the PDCP SN value, and The PDCP SN value is sent to the target base station, so that the target base station determines retransmission data to the user equipment according to the PDCP SN value, thereby ensuring continuity of data transmission before and after handover.
  • the first base station is a base station before handover, and the target base station is a base station after handover.
  • the user equipment may release the configuration information of the first base station, so as to continue data transmission with the second base station.
  • the embodiment of the present invention further provides another communication method, corresponding to the communication method of the uplink data sent by the user equipment to the first base station. As shown in FIG. 7, when determining that the first base station switches to the target base station, the first base station sends The request message is sent to the second base station to cause the second base station to send the RLC status report to the first base station.
  • the request message may include a report buffer data request message.
  • the second base station may send the foregoing RLC status report to the first base station according to the reported buffer data request message.
  • the first base station may start a timer, and after the first base station receives the RLC status report or the timer of the first base station expires, the first base station may convert the RLC status report into a PDCP SN value, and The PDCP SN value is sent to the target base station, so that the target base station can determine retransmission data to the user equipment according to the PDCP SN value.
  • the first base station when the first base station receives the RLC status report or receives the RLC status report, the first base station can synchronously convert the RLC status report into a PDCP SN value. At this time, when the first base station determines to send the PDCP SN value to the target base station, the PDCP SN value that has been generated may be directly sent to the target base station to reduce the delay.
  • the second base station may add an "end flag" in the RLC status report to indicate that the RLC status report has been sent, so that when the first base station receives the "end flag", the RLC status is known.
  • the report has been sent, and the first base station converts the received RLC status report into a PDCP SN value, and sends the PDCP SN value to the target base station, so that the target base station can determine the weight to the user equipment according to the PDCP SN value.
  • Data is transmitted to ensure continuity of data transmission before and after switching.
  • the user equipment maintains communication with the first base station and the second base station, the first base station and the second base station are carrier aggregation, and when determining that the first base station switches to the target base station, the user The device sends an RLC status report to the second base station, where the second base station sends the indication information to the target base station via the first base station according to the RLC status report, so that the target base station determines the weight to the user equipment according to the indication information. Pass data.
  • the user equipment may send the RL C status report to the second base station, so that the second base station sends the RL C status report to the target base station according to the RLC status report. Instructing information, so that the target base station can determine retransmission data to the user equipment according to the indication information, thereby maximizing the continuity of data transmission between the user equipment and the base station in the carrier aggregation scenario.
  • the embodiment of the present invention provides another communication method.
  • the macro base station may indicate that the micro base station deletes the original state by using an RRC re-establishment state (RRC re-establishment success or failure).
  • RRC re-establishment success or failure Some configurations, or indicate that the user equipment and the micro base station perform security synchronization.
  • the RRC reconfiguration failure is taken as an example.
  • the macro base station and the micro base station, and the RRC connection between the micro base station and the user equipment need to be modified, such as establishment,
  • the RB Radio Bearer
  • the macro base station can separately send an RRC reconfiguration command to the user equipment and the micro base station.
  • the macro base station detects that the user equipment is After the macro base station fails the radio link, the macro base station may send an RRC reconfiguration cancel command to the micro base station, so that the micro base station can resume the configuration before the reconfiguration to perform data transmission.
  • the RRC re-establishment process is described in detail in the foregoing embodiment, and is not described here.
  • the user equipment when the user equipment fails to complete the radio link, the user equipment can autonomously restore the configuration before the reconfiguration.
  • the macro base station instructs the micro base station to delete the original configuration by the RRC re-establishment failure.
  • the macro base station determines that the RRC re-establishment fails, as determined by the macro base station
  • the timer of the macro base station expires or the RRC re-establishment request message of the user equipment is not allowed by the macro base station, and the macro base station sends a delete command to the micro base station, so that the micro base station stops the data transmission, and deletes the relevant configuration of the user equipment, which is If the RRC re-establishment between the macro base station and the user equipment fails, the macro base station cannot send control signaling to the user equipment. Therefore, the data transmission between the user equipment and the micro base station cannot be maintained.
  • the macro base station can successfully indicate that the user equipment and the micro base station perform security synchronization through RRC re-establishment.
  • the full configuration mode is, for example, deleting the configuration of the RB between the original user equipment and the macro base station, and between the user equipment and the micro base station, and completely reconfiguring these RBs.
  • the macro base station determines to update the security key, and the macro base station can reconfigure the RB by using a fully configured manner, that is, the macro base station separately provides the user equipment and the micro-base station.
  • the base station sends a full configuration indication to reconfigure the RB, so as to avoid deletion of the micro base station, thereby reducing the delay caused by the deletion and addition of the micro base station.
  • the user equipment and the micro base station may update the security key according to the full configuration indication delivered by the macro base station, that is, the user equipment and the micro base station may derive the second security key according to the full configuration indication, complete the security synchronization, and use the second security key.
  • the corresponding data packet is encrypted and decrypted to protect the integrity of the data and complete the secure transmission of the data.
  • the full configuration indication may be an implicit indication that the user equipment and the micro base station may consider that the security key needs to be updated after receiving a large number of messages containing the full configuration indication.
  • the macro eNB may send the full configuration indication to the user equipment in the RRC re-establishment message, or may send the RRC re-establishment message to the user equipment after the RRC re-establishment message is sent, which is not limited in the present invention.
  • the embodiment of the present invention provides another communication method, including: when a first base station fails or switches a radio link, the first base station and the user equipment use the first security key and the data packet respectively for a certain period of time.
  • the second security key performs a double solution, where the first security key is the old key and the second security key is the new key.
  • the first base station transmits a time to the user equipment using the dual key indication and using the dual key to decrypt the data packet.
  • the user device receives the use of a dual key
  • the user equipment may decrypt and verify the data packet using the first security key and the second security key respectively according to the use of the dual key indication.
  • the user equipment finds that the first base station uses the second security key for encryption, that is, the user equipment uses the second security key to complete the decryption of the data packet, the user equipment uses the second security key pair to be sent to the first base station.
  • the data packet is encrypted and integrity protected to ensure the secure transmission of data, thereby ensuring the continuity of data transmission.
  • the first base station may send a time to use the dual key indication and use the dual key to decrypt the data packet when sending the handover command or the RRC re-establishment message to the user equipment, or after sending the handover command or the RRC re-establishment message.
  • the time at which the double key indication is used and the data packet is decrypted using the double key is transmitted, and the present invention is not limited.
  • an embodiment of the present invention provides a user equipment 1, which corresponds to a communication method provided by an embodiment of the present invention.
  • the user equipment 1 may include:
  • the processing unit 10 is configured to perform data transmission with the first base station and the second base station via the first security key, and maintain the second base station when the user equipment is disconnected from the first base station Data transmission, the first base station and the second base station are carrier aggregation.
  • the obtaining unit 11 is configured to obtain indication information, and is used to instruct the processing unit 10 to perform data transmission with the first base station via a second security key.
  • the acquiring unit 11 is specifically configured to receive the security synchronization indication, where the security synchronization indication includes an SN for carrying a bearer of the data packet, where the security synchronization indication is used to indicate that the data packet is sent and received.
  • the processing unit 10 performs data transmission with the first base station via the second security key.
  • the acquiring unit 11 is further configured to receive an RRC re-establishment message sent by the first base station, where the RRC re-establishment message includes the security synchronization indication.
  • the security synchronization indication received by the acquiring unit 11 further includes a bearer HFN, configured to identify the bearer that carries the data packet.
  • the acquiring unit 11 is specifically configured to receive the first base station or the a PDU of a PDCP sent by the second base station, the PDU is used to indicate that the processing unit 10 performs data transmission with the first base station via the second security key, starting from receiving and transmitting the PDU.
  • the acquiring unit 11 is configured to acquire the indication information when a radio link failure or handover occurs in the first base station.
  • the processing unit 10 is further configured to: after the acquiring unit 11 receives the RRC re-establishment message, derive the second security key.
  • the processing unit 10 is specifically configured to: when the user equipment is disconnected from the macro base station, The PUCCH of the micro base station maintains data transmission with the micro base station.
  • An embodiment of the present invention provides a user equipment, where the user equipment performs data transmission with a first base station and a second base station via a first security key, and when the user equipment disconnects from the first base station, the user equipment maintains The data transmission with the second base station, the first base station and the second base station are carrier aggregation, and the user equipment acquires indication information, which is used to indicate that the user equipment performs data transmission with the first base station via the second security key.
  • an embodiment of the present invention provides a base station 2, which corresponds to a communication method provided by an embodiment of the present invention.
  • the base station 2 may include:
  • the transmitting unit 20 is configured to perform data transmission with the user equipment and the second base station by using the first security key, where the base station and the second base station are carrier aggregation.
  • the processing unit 21 is configured to disconnect the user equipment, where data transmission is maintained between the user equipment and the second base station.
  • the sending unit 22 is configured to send, to the user equipment, indication information, to indicate that the transmission unit 20 performs data transmission with the base station via a second security key.
  • the indication information includes a security synchronization indication, where the security synchronization indication includes an SN for carrying a bearer of the data packet.
  • the transmission unit 20 is specifically configured to perform data transmission with the user equipment via the second security key, starting from receiving and transmitting the data packet.
  • the sending unit 22 is configured to send an RRC re-establishment message to the user equipment, where the RRC re-establishment message includes the security synchronization indication.
  • the security synchronization indication further includes a bearer HFN, configured to identify the bearer that carries the data packet.
  • the indication information includes a PDU of a PDCP.
  • the transmitting unit 20 is specifically configured to perform data transmission with the user equipment by using the second security key, starting from sending and receiving the PDU.
  • the processing unit 21 is specifically configured to disconnect the user equipment when the first base station fails or switches a radio link.
  • the base station is a macro base station
  • the second base station is a micro base station.
  • An embodiment of the present invention provides a base station, where the base station performs data transmission with a user equipment and a second base station by using a first security key, where the base station and the second base station are carrier aggregation, and the base station is disconnected from the user equipment. And the connecting, wherein the user equipment maintains data transmission with the second base station, and the base station sends the indication information to the user equipment, where the user equipment is used to perform data transmission with the base station by using the second security key.
  • an embodiment of the present invention provides a user equipment 1 corresponding to another communication method (a communication method for downlink data sent by a first base station to a user equipment) according to an embodiment of the present invention, where the user equipment 1 Can include:
  • the processing unit 10 is configured to maintain communication with the first base station and the second base station, where the first The base station and the second base station are carrier aggregation.
  • the sending unit 12 is configured to: when determining that the first base station switches to the target base station, send an RLC status report to the second base station, where the second base station reports, according to the RLC status, that the first base station is And transmitting, to the target base station, indication information, so that the target base station determines retransmission data to the user equipment according to the indication information.
  • the processing unit 10 is further configured to: when the sending unit 12 sends the RLC status report to the second base station, start a timer of the user equipment, and if the sending unit 12 sends After the RLC status report or the timer of the user equipment expires, the configuration information of the first base station is released.
  • the sending unit 12 is specifically configured to send the RLC status report to the second base station when a radio link failure occurs between the user equipment and the first base station.
  • the user equipment when the user equipment receives the handover command from the first base station and receives an indication that the second base station maintains a connection with the user equipment, sending the RLC status to the second base station.
  • An embodiment of the present invention provides a user equipment, where the user equipment maintains communication with a first base station and a second base station, where the first base station and the second base station are carrier aggregation, and when determining that the first base station switches to the target base station, the user equipment The device sends an RLC status report to the second base station, where the second base station sends the indication information to the target base station via the first base station according to the RLC status report, so that the target base station determines the retransmission data to the user equipment according to the indication information.
  • the user equipment may send the RLC status report to the second base station, so that the second base station sends the indication information to the target base station via the first base station according to the RLC status report. Therefore, the target base station can determine the retransmission data to the user equipment according to the indication information, thereby maximally ensuring the continuity of data transmission between the user equipment and the base station in the carrier aggregation scenario.
  • the embodiment of the present invention provides a base station 3, which is related to another communication method provided by the embodiment of the present invention (downlink data sent by the first base station to the user equipment).
  • the communication method) the base station 3 may include:
  • the processing unit 30 is configured to maintain communication with the user equipment and the first base station, where the first base station and the base station are carrier aggregation.
  • the receiving unit 31 is configured to receive an RLC status report from the user equipment, where the RLC status report is sent by the user equipment when determining that the first base station switches to the target base station.
  • the sending unit 32 is configured to send, according to the RLC status report received by the receiving unit 31, the indication information to the target base station via the first base station, so that the target base station determines, according to the indication information, the user equipment Retransmit data.
  • the receiving unit 31 is configured to receive the RLC status report from the user equipment when a radio link failure occurs between the user equipment and the first base station.
  • the indication information sent by the sending unit 32 includes a PDCP SN.
  • the sending unit 32 is specifically configured to send, by using the first base station, the PDCP SN to the target base station according to the RLC status report received by the receiving unit 31.
  • An embodiment of the present invention provides a base station, where the base station maintains communication with a user equipment and a first base station, the first base station and the base station are carrier aggregation, and the base station receives an RLC status report from the user equipment, and the RLC status report is determined to be determined.
  • the base station When the first base station switches to the target base station, the user equipment sends, and the base station sends the indication information to the target base station via the first base station according to the received RLC status report, so that the target base station determines the retransmission data to the user equipment according to the indication information.
  • the user equipment may send an RLC status report to the second base station, so that the second base station sends an indication message to the target base station via the first base station according to the RLC status report. Therefore, the target base station can determine the retransmission data to the user equipment according to the indication information, thereby maximizing the continuity of data transmission between the user equipment and the base station in the carrier aggregation scenario.
  • an embodiment of the present invention provides a base station 2, which corresponds to another communication method (a communication method for uplink data sent by a user equipment to a first base station) provided by an embodiment of the present invention, where the base station 2 may include :
  • the sending unit 22 is configured to: when determining that the base station is handed over to the target base station, send a request message to the second base station, where the request message includes a report buffer data request message;
  • the receiving unit 23 is configured to receive an RLC status report sent by the second base station according to the reported cache data request message.
  • the base station further includes a processing unit 21, configured to start a timer of the base station when the sending unit 22 sends the request message.
  • the processing unit 21 is further configured to convert the RLC status report into a PDCP SN value after the receiving unit 23 receives the RLC status report or the timer of the base station times out.
  • the sending unit 22 is further configured to send a PDCP SN value to the target base station, so that the target base station can determine retransmission data to the user equipment according to the PDCP SN value.
  • the RLC status report received by the receiving unit 23 includes a “end flag” for indicating that the RLC status report is sent.
  • the processing unit 21 is specifically configured to convert the RLC state report to a PDCP SN value according to the “end flag” received by the receiving unit 23 .
  • An embodiment of the present invention provides a base station, where the base station can send a request message to the second base station to request the second base station to report an RLC status report corresponding to the data buffered by the second base station, and the base station converts the RLC status report into a PDCP SN value, and the base station sends the PDCP SN value to the target base station, so that the target base station can determine retransmission data to the user equipment according to the PDCP SN value, thereby ensuring continuity of data transmission before and after handover, and further The continuity of data transmission between the user equipment and the base station in the carrier aggregation scenario is ensured to the utmost extent.
  • an embodiment of the present invention provides a base station 4, which corresponds to another communication method provided by the embodiment of the present invention.
  • the base station 4 may include:
  • the sending unit 40 is configured to send an RRC reconfiguration command to the user equipment and the micro base station when the RRC connection needs to be modified, and send an RRC reconfiguration cancel command to the micro when the user equipment fails to send the radio link. Base station.
  • the receiving unit 4 1 is configured to receive an RRC re-establishment request message from the user equipment.
  • the sending unit 40 is further configured to send an RRC re-establishment message corresponding to the RRC re-establishment request message to the user equipment.
  • the sending unit 40 is further configured to: when the base station determines that the RRC re-establishment fails, send a delete command to the micro base station, so that the micro base station stops data transmission, and deletes the related information of the user equipment. Configuration.
  • the sending unit 40 is further configured to: when the base station determines that the RRC re-establishment is successful and needs to update the security key, send the full configuration indication to the user equipment and the micro base station, so that the user equipment and the micro base station are restarted.
  • the full configuration indication is an implicit indication.
  • the embodiment of the present invention provides a base station, which can instruct the micro base station to delete the original configuration by using the RRC re-establishment status between the user equipment and the base station, or instruct the user equipment and the micro base station to perform security synchronization.
  • the base station may instruct the micro base station to delete the original configuration when the RRC re-establishment between the user equipment and the base station fails, or the base station may indicate the user when the RRC re-establishment between the user equipment and the base station is successful.
  • the device and the micro base station perform security synchronization, so that the continuity of data transmission between the user equipment and the micro base station can be ensured regardless of the RRC re-establishment failure between the user equipment and the base station, thereby ensuring carrier aggregation to the utmost extent.
  • the continuity of data transmission between the user equipment and the base station In the scenario, the continuity of data transmission between the user equipment and the base station.
  • an embodiment of the present invention provides a base station 2, which corresponds to another communication method provided by the embodiment of the present invention.
  • the base station 2 may include:
  • the sending unit 22 is configured to: when the base station fails to perform radio link failure or handover, send a time to use the dual key indication and use the dual key to decrypt the data packet to the user equipment, to And causing the user equipment to decrypt and verify the data packet by using the first security key and the second security key respectively within the indicated time according to the using the dual key indication.
  • the receiving unit 23 is configured to receive an encrypted data packet from the user equipment, where the encrypted data packet is obtained by encrypting the data packet by using the first security key or the second security key by the user equipment.
  • the processing unit 21 is configured to decrypt the encrypted data packet according to the first security key or the second security key.
  • the sending unit 22 is specifically configured to send the using the dual key indication and the using the dual key to decrypt the data packet to the user equipment when sending the handover command or the RRC re-establishment message to the user equipment.
  • the sending unit 22 is configured to send the using the dual key indication and the using the dual key to decrypt the data packet to the user equipment after sending the handover command or the RRC re-establishment message.
  • An embodiment of the present invention provides a base station, which can send a time to a user equipment using a dual key indication and using a dual key to decrypt a data packet to a user equipment when a radio link failure or handover occurs, so that the user equipment can Using the dual key indication, decrypting and integrity verification of the data packet using the first security key and the second security key respectively during the indicated time, so that when the user equipment uses the first security key or the second security key After the data packet is decrypted, the user equipment can encrypt the data packet by using the decrypted security key to ensure the continuity of data transmission between the user equipment and the first base station, thereby ensuring the maximum carrier aggregation scenario. The continuity of data transmission between the user equipment and the base station.
  • an embodiment of the present invention provides a user equipment, which corresponds to a communication method provided by an embodiment of the present invention.
  • the user equipment may include a transmitter 13, a receiver 14, a processor 15, and a memory 16, where ,
  • the transmitter 13 can be configured to send an uplink signal to a network device such as a base station. In particular, if the user equipment needs to communicate with the base station, the transmitter 13 can send uplink communication data to the base station.
  • the receiver 14 can be configured to receive downlink signals from network devices such as base stations. In particular, if the user equipment needs to communicate with the base station, the receiver 14 can receive downlink communication data from the base station.
  • the processor 15 is a control and processing center of the user equipment, by running a software program stored in the memory 16, and calling and processing the data stored in the memory 16, thereby controlling the user equipment to transmit and receive signals, and implementing other functions of the user equipment. .
  • the memory 16 can be used to store software programs and data such that the processor 15 can implement the transceiving and other functions of the user equipment by running software programs stored in the memory 16.
  • the processor 15 is configured to perform data transmission with the first base station and the second base station by using the first security key through the transmitter 13 and the receiver 14, and when the user equipment is When the first base station is disconnected, the data transmission with the second base station is maintained by the transmitter 13 and the receiver 14, and can be used to obtain indication information for indicating that the processor 15 is via the second security.
  • the memory 16 is configured to store the first security a software code of the key, a software code of the second security key, a software code of the data to be transmitted, and a software program for controlling the user equipment to interact with the first base station and the second base station to
  • the processor 15 can complete the user equipment with the first base station and by executing the software program stored in the memory 16 and calling corresponding software code Interaction between the two base stations.
  • the processor 15 is specifically configured to receive a security synchronization indication, where the security synchronization indication includes an SN for carrying a bearer of a data packet, where the security synchronization indication is used to indicate that the data packet is sent and received. Initially, the processor 15 performs data transmission with the first base station via the second security key.
  • the receiver 14 is further configured to receive an RRC re-establishment message sent by the first base station, where the RRC re-establishment message includes the security synchronization indication.
  • the security synchronization indication received by the receiver 14 further includes a bearer HFN, configured to identify the bearer that carries the data packet.
  • the receiver 14 is configured to receive a PDU of a PDCP sent by the first base station or the second base station, where the PDU is used to indicate that the processor 1 is started by sending and receiving the PDU. 5 performing data transmission with the first base station via the second security key.
  • the processor 15 is configured to acquire the indication information when a failure occurs or a handover of the wireless link occurs in the first base station.
  • the processor 15 is further configured to: after the receiver 14 receives the RRC re-establishment message, derive the second security key.
  • the processor 15 is specifically configured to: when the user equipment is disconnected from the macro base station, based on The PUC CH of the micro base station maintains data transmission with the micro base station.
  • An embodiment of the present invention provides a user equipment, where the user equipment performs data transmission with a first base station and a second base station via a first security key, and when the user equipment disconnects from the first base station, the user equipment maintains The data transmission with the second base station, the first base station and the second base station are carrier aggregation, and the user equipment acquires indication information, which is used to indicate that the user equipment performs data transmission with the first base station via the second security key.
  • an embodiment of the present invention provides a base station, which corresponds to a communication method provided by an embodiment of the present invention.
  • the base station may include a transmitter 24, a receiver 25, a processor 26, and a memory 27, where ,
  • the transmitter 24 can be configured to send a downlink signal to the user equipment. In particular, if the user equipment needs to communicate with the base station, the transmitter 24 can transmit downlink communication data to the user equipment.
  • the receiver 25 can be configured to receive an uplink signal from the user equipment, in particular, if When the user equipment needs to communicate with the base station, the receiver 25 can receive uplink communication data from the user equipment.
  • the processor 26 is the control and processing center of the base station, and controls the base station to transmit and receive signals and other functions of the base station by running a software program stored in the memory 27 and calling and processing the data stored in the memory 27.
  • the memory 27 can be used to store software programs and data such that the processor 26 can implement the base station's transceiving signals and other functions by running software programs stored in the memory 27.
  • the processor 26 is configured to perform data transmission with the user equipment and the second base station by using the first security key by using the transmitter 24 and the receiver 25, where the base station and the second base station For the carrier aggregation; the processor 26 can be configured to disconnect the user equipment, where the user equipment and the second base station maintain data transmission; the transmitter 24 can also be used for The user equipment sends the indication information, which is used to indicate that the processor 26 performs data transmission with the base station via the second security key; the memory 27 can be used to store the software code of the first security key, the second security a software code of the key, a software code of the data to be transmitted, and a software program that controls the base station to interact with the user equipment and the second base station such that the processor 26 can execute the memory 27
  • the software program stored in the program and the corresponding software code are used to complete an interaction process between the base station and the user equipment and the second base station.
  • the indication information includes a security synchronization indication, where the security synchronization indication includes an SN of a bearer for carrying a data packet.
  • the transmitter 24 and the receiver 25 are specifically configured to perform data transmission with the user equipment via the second security key, starting from receiving and transmitting the data packet.
  • the transmitter 24 is configured to send an RRC re-establishment message to the user equipment, where the RRC re-establishment message includes the security synchronization indication.
  • the security synchronization indication further includes a bearer HFN, configured to identify the bearer that carries the data packet.
  • the indication information includes a PDU of a PDCP.
  • the transmitter 24 And the receiver 2 5 is specifically configured to perform data transmission with the user equipment by using the second security key, starting from sending and receiving the PDU.
  • the processor is configured to disconnect the user equipment when the first base station fails or switches over the wireless link.
  • the base station is a macro base station
  • the second base station is a micro base station.
  • An embodiment of the present invention provides a base station, where the base station performs data transmission with a user equipment and a second base station by using a first security key, where the base station and the second base station are carrier aggregation, and the base station is disconnected from the user equipment. And the connecting, wherein the user equipment maintains data transmission with the second base station, and the base station sends the indication information to the user equipment, where the user equipment is used to perform data transmission with the base station by using the second security key.
  • an embodiment of the present invention provides a user equipment, which is related to another communication method (a communication method for downlink data sent by a first base station to a user equipment) provided by an embodiment of the present invention, where the user equipment may
  • the transmitter 13 includes a receiver 14 , a processor 15 , and a memory 16 , wherein
  • the transmitter 13 can be used to send an uplink signal to a network device such as a base station.
  • a network device such as a base station.
  • the transmitter 13 can send the uplink communication data to the base station.
  • the receiver 1 4 can be used to receive downlink signals from network devices such as base stations.
  • the receiver 14 can receive downlink communication data from the base station.
  • the processor 15 is a control and processing center of the user equipment, and controls the user equipment to transmit and receive signals, and implements the user equipment by running a software program stored in the memory 16 and calling and processing the data stored in the memory 16. Other features.
  • the memory 16 can be used to store software programs and data such that the processor 15 can implement the transceiving signals and other functions of the user equipment by running software programs stored in the memory 16.
  • the processor 15 is configured to maintain communication with the first base station and the second base station by using the transmitter 13 and the receiver 14, where the first base station and the second base station are carrier aggregation;
  • the transmitter 13 is configured to: when determining that the first base station switches to the target base station, send an RLC status report to the second base station, where the second base station reports, according to the RLC status, via the first base station.
  • the target base station sends indication information, so that the target base station determines retransmission data to the user equipment according to the indication information;
  • the memory 16 may be used to store software code of the RLC status report, software code of communication data.
  • a software program for controlling the user equipment to interact with the first base station and the second base station, so that the processor 15 can invoke the software code to complete the user equipment and the device according to the software program. The interaction process between the first base station and the second base station.
  • the processor 15 is further configured to: when the transmitter 13 sends the RLC status report to the second base station, start a timer of the user equipment, and if the transmitter 13 sends After the RLC status report or the timer of the user equipment expires, the configuration information of the first base station is released.
  • the transmitter 13 is specifically configured to send the RLC status report to the second base station when a radio link failure occurs between the user equipment and the first base station.
  • the user equipment when the user equipment receives the handover command from the first base station and receives an indication that the second base station maintains a connection with the user equipment, sending the RLC status to the second base station.
  • An embodiment of the present invention provides a user equipment, where the user equipment maintains communication with a first base station and a second base station, where the first base station and the second base station are carrier aggregation, and when determining that the first base station switches to the target base station, the user equipment
  • the device sends an RLC status to the second base station.
  • the report is used by the second base station to send the indication information to the target base station via the first base station according to the RLC status report, so that the target base station determines the retransmission data to the user equipment according to the indication information.
  • the user equipment may send the RL C status report to the second base station, so that the second base station sends the indication information to the target base station via the first base station according to the RLC status report. Therefore, the target base station can determine the retransmission data to the user equipment according to the indication information, thereby maximizing the continuity of data transmission between the user equipment and the base station in the carrier aggregation scenario.
  • an embodiment of the present invention provides a base station, which is related to another communication method (a communication method for downlink data sent by a first base station to a user equipment) according to an embodiment of the present invention, where the base station may include sending The device 3 3, the receiver 34, the processor 35 and the memory 36, wherein
  • the transmitter 3 3 can be used to send a downlink signal to the user equipment.
  • the transmitter 3 3 can transmit the downlink communication data to the user equipment.
  • the receiver 34 can be configured to receive uplink signals from the user equipment.
  • the receiver 34 can receive uplink communication data from the user equipment if the user equipment is to communicate with the base station.
  • the processor 35 is a control and processing center of the base station, and controls the base station to transmit and receive signals and other functions of the base station by running a software program stored in the memory 36 and calling and processing the data stored in the memory 36.
  • Memory 36 can be used to store software programs and data such that processor 35 can implement the base station's transceiving signals and other functions by running software programs stored in memory 36.
  • the processor 35 is configured to maintain communication with the user equipment and the first base station by using the transmitter 33 and the receiver 34, where the first base station and the base station are carrier aggregation; the receiver The 34 is operative to receive an RLC status report from the user equipment, where the RLC status report is sent by the user equipment when determining that the first base station switches to a target base station; The RLC status report received by the receiver 34 sends an indication to the target base station via the first base station Information, so that the target base station determines retransmission data to the user equipment according to the indication information; the memory 36 may be configured to store software code of the RLC status report, software code of communication data, and control the base station and a software program that the user equipment interacts with the first base station, such that the processor 35 can invoke the software code to complete the base station, the user equipment, and the first base station according to the software program.
  • the receiver 34 is configured to receive the RLC status report from the user equipment when a radio link failure occurs between the user equipment and the first base station.
  • the indication information sent by the sender 33 includes a PDCP SN.
  • the transmitter 33 is specifically configured to send the PDCP SN to the target base station via the first base station according to the RLC status report received by the receiver 34.
  • An embodiment of the present invention provides a base station, where the base station maintains communication with a user equipment and a first base station, the first base station and the base station are carrier aggregation, and the base station receives an RLC status report from the user equipment, and the RLC status report is determined to be determined.
  • the base station When the first base station switches to the target base station, the user equipment sends, and the base station sends the indication information to the target base station via the first base station according to the received RLC status report, so that the target base station determines the retransmission data to the user equipment according to the indication information.
  • the user equipment may send the RLC status report to the second base station, so that the second base station sends the indication information to the target base station via the first base station according to the RLC status report. Therefore, the target base station can determine the retransmission data to the user equipment according to the indication information, thereby maximally ensuring the continuity of data transmission between the user equipment and the base station in the carrier aggregation scenario.
  • an embodiment of the present invention provides a communication system corresponding to the present disclosure.
  • the communication system may include a first base station, a second base station, and a user equipment.
  • an embodiment of the present invention further provides another communication system, which is related to another communication method provided by an embodiment of the present invention.
  • the communication system may include a first base station, a second base station, a user equipment, and a target. Base station.
  • the disclosed system, apparatus, and method may be implemented in other manners.
  • the device embodiments described above are merely illustrative.
  • the division of the modules or units is only a logical function division.
  • there may be another division manner for example, multiple units or components may be used. Combined or can be integrated into another system, or some features can be ignored, or not executed.
  • the coupling or direct coupling or communication connection shown or discussed may be an indirect coupling or communication connection through some interface, device or unit, and may be electrical, mechanical or otherwise.
  • the units described as separate components may or may not be physically separated, and the components displayed as the units may or may not be physical units, and may be located in one place or may be distributed to multiple network units. Some or all of the units may be selected according to actual needs to achieve the objectives of the embodiment of the present embodiment.
  • each functional unit in each embodiment of the present invention may be integrated into one processing unit, or each unit may exist physically separately, or two or more units may be integrated into one unit.
  • the above integrated unit can be implemented in the form of hardware or in the form of a software functional unit.
  • the integrated unit is implemented in the form of a software functional unit and is independent When the product is sold or used, it can be stored on a computer readable storage medium.
  • the instructions include a plurality of instructions for causing a computer device (which may be a personal computer, a server, or a network device, etc.) or a processor to perform all or part of the steps of the methods of the various embodiments of the present invention.
  • the foregoing storage medium includes: a U disk, a mobile hard disk, a read-only memory (ROM), a random access memory (RAM), a magnetic disk or an optical disk, and the like, which can store program codes. .

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Abstract

本发明实施例提供一种通信方法及装置,涉及通信领域,能够最大限度地保证载波聚合场景下,用户设备与基站之间的数据传输的连续性。该方法包括:用户设备经由第一安全密钥,与第一基站和第二基站进行数据传输,所述第一基站与所述第二基站为载波聚合;当所述用户设备与所述第一基站断开连接时,所述用户设备维持与所述第二基站的数据传输;所述用户设备获取指示信息,用于指示所述用户设备经由第二安全密钥,与所述第一基站进行数据传输。

Description

一种通信方法及装置 技术领域
本发明涉及通信领域, 尤其涉及一种通信方法及装置。
背景技术
随着移动通信系统的发展, 通信系统提供服务的质量也越来越 高。 为了保持 3GPP ( The 3rd Generation Partnership Project, 第三代合作伙伴计划 ) 的长期竟争优势, 作为 LTE (Long Term Evolution,长期演进)技术的进一步演进的 LTE-A (LTE-Advanced, 长期演进系统后续演进)的标准制定工作正在进行。 为了进一步提高 通信系统的频谱效率和用户的数据吞吐量, 载波聚合 ( CA, Carrier Aggregation )技术被引入到 LTE-A中。 载波聚合是指用户设备可以 同时使用多个成员载波( CC, Component Carrier )进行上下行通信, 从而可以实现高速数据传输。
目前, 一个基站可以包括一个或多个小区 (一个主小区和其他 多个辅小区 ), 其中, 小区为基站使用电磁波覆盖的一个区域。
现有技术中, LTE 系统的载波聚合主要有基站内部的小区之间 的载波聚合以及基站间的载波聚合。 针对基站内部的小区之间的载 波聚合, 当用户设备与主小区断开连接时, 用户设备与辅小区也会 断开连接, 即用户设备会中止与主、 辅基站间的通讯。
针对基站间的载波聚合, 因为与用户设备进行通讯的基站数量 增加, 必然导致各个基站与用户设备间的数据传输方案更为复杂, 当其中某个基站与用户设备的通讯中断时, 如何最大限度地保证用 户设备与基站间数据传输的连续性成为业界期待解决的问题。
发明内容
本发明的实施例提供一种通信方法及装置, 能够最大限度地保 证载波聚合场景下, 用户设备与基站之间的数据传输的连续性。
为达到上述目的, 本发明的实施例釆用如下技术方案: 第一方面, 本发明的实施例提供一种通信方法, 包括: 用户设备经由第一安全密钥, 与第一基站和第二基站进行数据 传输, 所述第一基站与所述第二基站为载波聚合;
当所述用户设备与所述第一基站断开连接时, 所述用户设备维 持与所述第二基站的数据传输;
所述用户设备获取指示信息, 用于指示所述用户设备经由第二 安全密钥, 与所述第一基站进行数据传输。
在第一方面的第一种可能的实现方式中, 所述用户设备获取指 示信息, 具体包括:
所述用户设备接收安全同步指示;
其中, 所述安全同步指示包括用于承载数据包的承载的序列号
S N , 所述安全同步指示用于指示从收发所述数据包开始, 所述用户 设备经由所述第二安全密钥与所述第一基站进行数据传输。
结合第一方面的第一种可能的实现方式, 在第二种可能的实现 方式中, 所述用户设备接收安全同步指示, 具体包括:
所述用户设备接收所述第一基站发送的无线资源控制 R R C重建 立消息, 所述 RR C重建立消息包括所述安全同步指示。
结合第一方面的第一种可能的实现方式或第二种可能的实现方 式, 在第三种可能的实现方式中,
所述安全同步指示还包括承载的超帧号 H F N , 用于标识承载所 述数据包的所述承载。
在第一方面的第四种可能的实现方式中, 所述用户设备获取指 示信息, 具体包括:
所述用户设备接收所述第一基站或所述第二基站发送的分组数 据汇聚协议 P D C P的协议数据单元 P DU , 所述 P DU用于指示从收发所 述 P DU 开始, 所述用户设备经由所述第二安全密钥与所述第一基站 进行数据传输。
结合前述的第一方面或第一方面的第一种可能的实现方式至第 四种可能的实现方式中的任一种实现方式, 在第五种可能的实现方 式中, 所述用户设备获取指示信息, 具体包括: 当所述第一基站发 生无线链路失败或切换时, 所述用户设备获取所述指示信息。
结合第一方面的第二种可能的实现方式至第五种可能的实现方 式中的任一种实现方式, 在第六种可能的实现方式中, 还包括: 所述用户设备收到所述 RRC重建立消息后, 衍生所述第二安全 密钥。
结合前述的第一方面或第一方面的第一种可能的实现方式至第 六种可能的实现方式中的任一种实现方式, 在第七种可能的实现方 式中,
所述第一基站为宏基站, 所述第二基站为微基站。
结合第一方面的第七种可能的实现方式, 在第八种可能的实现 方式中, 所述当所述用户设备与所述第一基站断开连接时, 所述用 户设备维持与所述第二基站的数据传输, 具体包括:
所述微基站具有物理上行控制信道 PUCC H , 当所述用户设备与 所述宏基站断开连接时, 所述用户设备基于所述 PUCCH 维持与所述 微基站的数据传输。
第二方面, 本发明的实施例还提供一种通信方法, 包括: 第一基站经由第一安全密钥与用户设备和第二基站进行数据传 输, 所述第一基站与所述第二基站为载波聚合;
所述第一基站断开与所述用户设备的连接, 其中, 所述用户设 备与所述第二基站之间维持数据传输;
所述第一基站向所述用户设备发送指示信息, 用于指示所述用 户设备经由第二安全密钥与所述第一基站进行数据传输。
在第二方面的第一种可能的实现方式中, 所述指示信息包括安 全同步指示, 所述安全同步指示包括用于承载数据包的承载的序列 号 SN ;
其中, 所述第一基站经由第二安全密钥与所述用户设备进行数 据传输, 具体包括:
从收发所述数据包开始, 所述第一基站经由所述第二安全密钥 与所述用户设备进行数据传输。
结合第二方面的第一种可能的实现方式, 在第二种可能的实现 方式中, 所述从收发所述数据包开始, 所述第一基站经由所述第二 安全密钥与所述用戶设备进行数据传输之前, 所述方法还包括: 所述第一基站发送无线资源控制 RRC重建立消息至所述用户设 备, 所述 RRC重建立消息包括所述安全同步指示。
结合第二方面的第一种可能的实现方式或第二种可能的实现方 式, 在第三种可能的实现方式中,
所述安全同步指示还包括承载的超帧号 HFN , 用于标识承载所 述数据包的所述承载。
在第二方面的第四种可能的实现方式中,
所述指示信息包括分组数据汇聚协议 PDCP 的协议数据单元
PDU ;
其中, 所述第一基站经由第二安全密钥与所述用户设备进行数 据传输, 具体包括:
从收发所述 PDU开始, 所述第一基站经由所述第二安全密钥与 所述用户设备进行数据传输。
结合前述的第二方面或第二方面的第一种可能的实现方式至第 四种可能的实现方式中的任一种实现方式, 在第五种可能的实现方 式中, 所述第一基站断开与所述用户设备的连接, 具体包括:
当所述第一基站发生无线链路失败或切换时, 所述第一基站断 开与所述用户设备的连接。
结合前述的第二方面或第二方面的第一种可能的实现方式至第 五种可能的实现方式中的任一种实现方式, 在第六种可能的实现方 式中,
所述第一基站为宏基站, 所述第二基站为微基站。
第三方面, 本发明的实施例提供另一种通信方法, 包括: 用户设备与第一基站及第二基站保持通讯, 所述第一基站与所 述第二基站为载波聚合; 当确定所述第一基站切换至目标基站时, 所述用户设备向所述 第二基站发送无线链路控制 RL C 状态报告, 用于所述第二基站根据 所述 R L C 状态报告, 经由所述第一基站向所述目标基站发送指示信 息, 以便所述目标基站根据所述指示信息确定向所述用户设备的重 传数据。
在第三方面的第一种可能的实现方式中, 所述方法还包括: 所述用户设备向所述第二基站发送所述 RL C状态报告时, 所述 用户设备启动所述用户设备的定时器;
若所述用户设备发送完所述 RL C状态报告或所述用户设备的定 时器超时, 所述用户设备释放所述第一基站的配置信息。
结合前述的第三方面或第三方面的第一种可能的实现方式, 在 第二种可能的实现方式中, 所述当确定第一基站切换至目标基站时, 所述用户设备向所述第二基站发送 RL C状态报告, 具体包括:
当所述用户设备与所述第一基站之间发生无线链路失败时, 所 述用户设备向所述第二基站发送所述 RL C状态报告;
或者,
当所述用户设备接收来自所述第一基站的 R L C 状态上报指示 时, 所述用户设备向所述第二基站发送所述 RL C状态报告;
或者,
当所述用户设备接收来自所述第一基站的切换命令且所述第二 基站与所述用户设备保持连接的指示时, 所述用户设备向所述第二 基站发送所述 RL C状态报告。
结合前述的第三方面或第三方面的第一种可能的实现方式至第 二种可能的实现方式中的任一种实现方式, 在第三种可能的实现方 式中,
所述第一基站为宏基站, 所述第二基站为微基站。
第四方面, 本发明实施例还提供另一种通信方法, 包括: 第二基站与用户设备及第一基站保持通讯, 所述第一基站与所 述第二基站为载波聚合; 所述第二基站接收来自所述用户设备的无线链路控制 RLC状态 报告, 所述 RLC状态报告为当确定所述第一基站切换至目标基站时, 所述用户设备发送的;
所述第二基站根据所述 RLC状态报告经由所述第一基站向所述 目标基站发送指示信息, 以便所述目标基站根据所述指示信息确定 向所述用户设备的重传数据。
在第四方面的第一种可能的实现方式中, 所述第二基站接收来 自所述用户设备的 RLC状态报告, 具体包括:
当所述用户设备与所述第一基站之间发生无线链路失败时, 所 述第二基站接收来自所述用户设备的所述 RLC状态报告;
或者,
当所述用户设备接收来自所述第一基站的 RLC 状态上报指示 时, 所述第二基站接收来自所述用户设备的所述 RLC状态报告; 或者,
当所述用户设备接收来自所述第一基站的切换命令且所述第二 基站与所述用户设备保持连接的指示时, 所述第二基站接收来自所 述用户设备的所述 RLC状态报告。
结合前述的第四方面或第四方面的第一种可能的实现方式, 在 第二种可能的实现方式中, 所述指示信息包括分组数据汇聚协议序 歹' J号 PDCP SN;
其中, 所述第二基站根据所述 RLC状态报告经由所述第一基站 向所述目标基站发送指示信息, 具体包括:
所述第二基站根据所述 RLC状态报告经由所述第一基站向所述 目标基站发送所述 PDCP SN。
结合前述的第四方面或第四方面的第一种可能的实现方式至第 二种可能的实现方式中的任一种实现方式, 在第三种可能的实现方 式中,
所述第一基站为宏基站, 所述第二基站为微基站。
第五方面, 本发明的实施例提供一种用户设备, 包括: 处理单元, 用于经由第一安全密钥, 与第一基站和第二基站进 行数据传输, 以及当所述用户设备与所述第一基站断开连接时, 维 持与所述第二基站的数据传输, 所述第一基站与所述第二基站为载 波聚合;
获取单元, 用于获取指示信息, 用于指示所述处理单元经由第 二安全密钥, 与所述第一基站进行数据传输。
在第五方面的第一种可能的实现方式中,
所述获取单元, 具体用于接收安全同步指示;
其中, 所述安全同步指示包括用于承载数据包的承载的序列号
S N , 所述安全同步指示用于指示从收发所述数据包开始, 所述处理 单元经由所述第二安全密钥与所述第一基站进行数据传输。
结合第五方面的第一种可能的实现方式, 在第二种可能的实现 方式中,
所述获取单元, 还用于接收所述第一基站发送的无线资源控制 RR C重建立消息, 所述 RR C重建立消息包括所述安全同步指示。
结合第五方面的第一种可能的实现方式或第二种可能的实现方 式, 在第三种可能的实现方式中,
所述获取单元接收的所述安全同步指示还包括承载的超帧号 H F N , 用于标识承载所述数据包的所述承载。
在第五方面的第四种可能的实现方式中,
所述获取单元, 具体用于接收所述第一基站或所述第二基站发 送的分组数据汇聚协议 P D C P的协议数据单元 P D U , 所述 P DU用于指 示从收发所述 P DU 开始, 所述处理单元经由所述第二安全密钥与所 述第一基站进行数据传输。
在第五方面的第五种可能的实现方式中,
所述获取单元, 具体用于当所述第一基站发生无线链路失败或 切换时, 获取所述指示信息。
结合第五方面的第二种可能的实现方式至第五种可能的实现方 式中的任一种实现方式, 在第六种可能的实现方式中, 所述处理单元, 还用于在所述获取单元接收到所述 RRC重建立 消息后, 衍生所述第二安全密钥。
结合第五方面的第六种可能的实现方式, 在第七种可能的实现 方式中, 当所述第一基站为宏基站, 所述第二基站为微基站时: 所述处理单元, 具体用于当所述用户设备与所述宏基站断开连 接时, 基于所述微基站的物理上行控制信道 PUCCH 维持与所述微基 站的数据传输。
第六方面, 本发明的实施例提供一种基站, 包括:
传输单元, 用于经由第一安全密钥与用户设备和第二基站进行 数据传输, 其中, 所述基站与所述第二基站为载波聚合;
处理单元, 用于断开与所述用户设备的连接, 其中, 所述用户 设备与所述第二基站之间维持数据传输;
发送单元, 用于向所述用户设备发送指示信息, 用于指示所述 传输单元经由第二安全密钥与所述基站进行数据传输。
在第六方面的第一种可能的实现方式中, 所述指示信息包括安 全同步指示, 所述安全同步指示包括用于承载数据包的承载的序列 号 SN ;
其中, 所述处理单元, 具体用于从收发所述数据包开始, 经由 所述第二安全密钥与所述用户设备进行数据传输。
结合第六方面的第一种可能的实现方式, 在第二种可能的实现 方式中;
所述发送单元, 用于发送无线资源控制 RRC重建立消息至所述 用户设备, 所述 RRC重建立消息包括所述安全同步指示。
结合第六方面的第一种可能的实现方式或第二种可能的实现方 式, 在第三种可能的实现方式中,
所述安全同步指示还包括承载的超帧号 HFN , 用于标识承载所 述数据包的所述承载。
在第六方面的第四种可能的实现方式中, 所述指示信息包括分 组数据汇聚协议 PDCP的协议数据单元 PDU ; 其中, 所述处理单元, 具体用于从收发所述 P DU开始, 经由所 述第二安全密钥与所述用户设备进行数据传输。
结合前述的第六方面或第六方面的第一种可能的实现方式至第 四种可能的实现方式中的任一种实现方式, 在第五种可能的实现方 式中,
所述处理单元, 具体用于当所述第一基站发生无线链路失败或 切换时, 断开与所述用户设备的连接。
结合前述的第六方面或第六方面的第一种可能的实现方式至第 五种可能的实现方式中的任一种实现方式, 在第六种可能的实现方 式中,
所述基站为宏基站, 所述第二基站为微基站。
第七方面, 本发明的实施例还提供一种用户设备, 包括: 处理单元, 用于与第一基站及第二基站保持通讯, 所述第一基 站与所述第二基站为载波聚合;
发送单元, 用于当确定所述第一基站切换至目标基站时, 向所 述第二基站发送无线链路控制 R L C 状态报告, 用于所述第二基站根 据所述 RL C 状态报告, 经由所述第一基站向所述目标基站发送指示 信息, 以便所述目标基站根据所述指示信息确定向所述用户设备的 重传数据。
在第七方面的第一种可能的实现方式中,
所述处理单元, 还用于在所述发送单元向所述第二基站发送所 述 RL C 状态报告时, 启动所述用户设备的定时器, 以及若所述发送 单元发送完所述 RL C 状态报告或所述用户设备的定时器超时, 则释 放所述第一基站的配置信息。
结合前述的第七方面或第七方面的第一种可能的实现方式, 在 第二种可能的实现方式中,
所述发送单元, 具体用于当所述用户设备与所述第一基站之间 发生无线链路失败时, 向所述第二基站发送所述 R L C状态报告; 或者, 当所述用户设备接收来自所述第一基站的 RLC 状态上报指示 时, 向所述第二基站发送所述 RLC状态报告;
或者,
当所述用户设备接收来自所述第一基站的切换命令且接收所述 第二基站与所述用户设备保持连接的指示时, 向所述第二基站发送 所述 RLC状态 ^艮告。
第八方面, 本发明的实施例还提供一种基站, 包括:
处理单元, 用于与用户设备及第一基站保持通讯, 所述第一基 站与所述基站为载波聚合;
接收单元, 用于接收来自所述用户设备的无线链路控制 RLC状 态报告, 所述 RLC 状态报告为当确定所述第一基站切换至目标基站 时, 所述用户设备发送的;
发送单元, 用于根据所述接收单元接收的所述 RLC状态报告经 由所述第一基站向所述目标基站发送指示信息, 以便所述目标基站 根据所述指示信息确定向所述用户设备的重传数据。
在第八方面的第一种可能的实现方式中,
所述接收单元, 具体用于当所述用户设备与所述第一基站之间 发生无线链路失败时, 接收来自所述用户设备的所述 RLC状态报告; 或者,
当所述用户设备接收来自所述第一基站的 RLC 状态上报指示 时, 接收来自所述用户设备的所述 RLC状态报告;
或者,
当所述用户设备接收来自所述第一基站的切换命令且接收所述 第二基站与所述用户设备保持连接的指示时, 接收来自所述用户设 备的所述 RLC状态报告。
结合前述的第八方面或第八方面的第一种可能的实现方式, 在 第二种可能的实现方式中, 所述发送单元发送的所述指示信息包括 分组数据汇聚协议序列号 PDCP SN;
其中, 所述发送单元, 具体用于根据所述接收单元接收的所述 RLC状态报告经由所述第一基站向所述目标基站发送所述 PDCP SN。 第九方面, 本发明的实施例提供一种用户设备, 包括:
处理器, 用于经由第一安全密钥, 与第一基站和第二基站进行 数据传输, 并当所述用户设备与所述第一基站断开连接时, 维持与 所述第二基站的数据传输, 以及获取指示信息, 所述指示信息用于 指示所述处理器经由第二安全密钥, 与所述第一基站进行数据传输, 所述第一基站与所述第二基站为载波聚合。
在第九方面的第一种可能的实现方式中, 所述用户设备还包括 接收器;
所述接收器, 具体用于接收安全同步指示;
其中, 所述安全同步指示包括用于承载数据包的承载的序列号 SN, 所述安全同步指示用于指示从收发所述数据包开始, 所述处理 器经由所述第二安全密钥与所述第一基站进行数据传输。
结合第九方面的第一种可能的实现方式, 在第二种可能的实现 方式中,
所述接收器, 具体用于接收所述第一基站发送的无线资源控制 RRC重建立消息, 所述 RRC重建立消息包括所述安全同步指示。
结合第九方面的第一种可能的实现方式或第二种可能的实现方 式, 在第三种可能的实现方式中,
所述接收器接收的所述安全同步指示还包括承载的超帧号 HFN, 用于标识承载所述数据包的所述承载。
在第九方面的第四种可能的实现方式中, 所述用户设备还包括 接收器;
所述接收器, 用于接收所述第一基站或所述第二基站发送的分 组数据汇聚协议 PDCP的协议数据单元 PDU, 所述 PDU用于指示从收 发所述 PDU 开始, 所述处理器经由所述第二安全密钥与所述第一基 站进行数据传输。
在第九方面的第五种可能的实现方式中,
所述处理器, 具体用于当所述第一基站发生无线链路失败或切 换时, 获取所述指示信息。
结合第九方面的第二种可能的实现方式至第五种可能的实现方 式中的任一种实现方式, 在第六种可能的实现方式中,
所述处理器, 还用于在所述接收器接收到所述 RRC重建立消息 后, 衍生所述第二安全密钥。
结合第九方面的第六种可能的实现方式, 在第七种可能的实现 方式中, 当所述第一基站为宏基站, 所述第二基站为微基站时: 所述处理器, 具体用于当所述用户设备与所述宏基站断开连接 时, 基于所述微基站的物理上行控制信道 PUCC H 维持与所述微基站 的数据传输。
第十方面, 本发明的实施例还提供一种基站, 包括:
处理器, 用于经由第一安全密钥与用户设备和第二基站进行数 据传输, 并断开与所述用户设备的连接, 其中, 所述用户设备与所 述第二基站之间维持数据传输, 所述基站与所述第二基站为载波聚 合;
发送器, 用于向所述用户设备发送指示信息, 用于指示所述处 理器经由第二安全密钥与所述基站进行数据传输。。
在第十方面的第一种可能的实现方式中, 所述指示信息包括安 全同步指示, 所述安全同步指示包括用于承载数据包的承载的序列 号 SN ;
其中, 所述处理器, 具体用于从收发所述数据包开始, 经由所 述第二安全密钥与所述用户设备进行数据传输。
结合第十方面的第一种可能的实现方式, 在第二种可能的实现 方式中;
所述发送器, 用于发送 RRC重建立消息至所述用户设备, 所述 RRC重建立消息包括所述安全同步指示。
结合第十方面的第一种可能的实现方式或第二种可能的实现方 式, 在第三种可能的实现方式中,
所述安全同步指示还包括承载的超帧号 HFN , 用于标识承载所 述数据包的所述承载。
在第十方面的第四种可能的实现方式中, 所述指示信息包括分 组数据汇聚协议 P DC P的协议数据单元 P DU ;
其中, 所述处理器, 具体用于从收发所述 P D U开始, 经由所述 第二安全密钥与所述用户设备进行数据传输。
结合前述的第十方面或第十方面的第一种可能的实现方式至第 四种可能的实现方式中的任一种实现方式, 在第五种可能的实现方 式中,
所述处理器, 具体用于当所述第一基站发生无线链路失败或切 换时, 断开与所述用户设备的连接。
结合前述的第十方面或第十方面的第一种可能的实现方式至第 五种可能的实现方式中的任一种实现方式, 在第六种可能的实现方 式中,
所述基站为宏基站, 所述第二基站为微基站。
第十一方面, 本发明的实施例还提供一种用户设备, 包括: 处理器, 用于与第一基站及第二基站保持通讯, 所述第一基站 与所述第二基站为载波聚合;
发送器, 用于当确定所述第一基站切换至目标基站时, 向所述 第二基站发送无线链路控制 RL C 状态报告, 用于所述第二基站根据 所述 R L C 状态报告, 经由所述第一基站向所述目标基站发送指示信 息, 以便所述目标基站根据所述指示信息确定向所述用户设备的重 传数据。
在第十一方面的第一种可能的实现方式中,
所述处理器, 还用于在所述发送器向所述第二基站发送所述 RL C 状态报告时, 启动所述用户设备的定时器, 以及若所述发送器 发送完所述 RL C 状态报告或所述用户设备的定时器超时, 则释放所 述第一基站的配置信息。
结合前述的第十一方面或第十一方面的第一种可能的实现方 式, 在第二种可能的实现方式中, 所述发送器, 具体用于当所述用户设备与所述第一基站之间发 生无线链路失败时, 向所述第二基站发送所述 RL C状态报告;
或者,
当所述用户设备接收来自所述第一基站的 R L C 状态上报指示 时, 向所述第二基站发送所述 RL C状态报告;
或者,
当所述用户设备接收来自所述第一基站的切换命令且接收所述 第二基站与所述用户设备保持连接的指示时, 向所述第二基站发送 所述 RL C状态 ^艮告。
第十二方面, 本发明的实施例提供一种基站, 包括:
处理器, 用于与用户设备及第一基站保持通讯, 所述第一基站 与所述基站为载波聚合;
接收器, 用于接收来自所述用户设备的无线链路控制 R L C状态 报告, 所述 RL C状态报告为当确定所述第一基站切换至目标基站时, 所述用户设备发送的;
发送器, 用于根据所述接收器接收的所述 RL C状态报告经由所 述第一基站向所述目标基站发送指示信息, 以便所述目标基站根据 所述指示信息确定向所述用户设备的重传数据。
在第十二方面的第一种可能的实现方式中,
所述接收器, 具体用于当所述用户设备与所述第一基站之间发 生无线链路失败时, 接收来自所述用户设备的所述 RL C状态报告; 或者,
当所述用户设备接收来自所述第一基站的 R L C 状态上报指示 时, 接收来自所述用户设备的所述 RL C状态报告;
或者,
当所述用户设备接收来自所述第一基站的切换命令且接收所述 第二基站与所述用户设备保持连接的指示时, 接收来自所述用户设 备的所述 RL C状态报告。
结合前述的第十二方面或第十二方面的第一种可能的实现方 式, 在第二种可能的实现方式中,
所述发送器发送的所述指示信息包括分组数据汇聚协议序列号
PDCP SN ;
其中, 所述发送器, 具体用于根据所述接收器接收的所述 RLC 状态报告经由所述第一基站向所述目标基站发送所述 PDCP SN。
本发明的实施例提供一种通信方法及装置, 通过用户设备经由 第一安全密钥, 与第一基站和第二基站进行数据传输, 第一基站与 第二基站为载波聚合, 并且, 当用户设备与第一基站断开连接时, 用户设备维持与第二基站的数据传输, 以及用户设备获取指示信息, 用于指示用户设备经由第二安全密钥, 与第一基站进行数据传输。 通过该方案, 在用户设备经由第一安全密钥与第一基站和第二基站 进行数据传输时, 若用户设备与第一基站断开连接, 则用户设备可 继续维持与第二基站的数据传输, 并且当用户设备获取到指示信息 后, 用户设备可根据指示信息, 经由第二安全密钥与第一基站进行 数据传输, 从而最大限度地保证了载波聚合场景下, 用户设备与基 站之间的数据传输的连续性。
附图说明
为了更清楚地说明本发明实施例或现有技术中的技术方案, 下 面将对实施例或现有技术描述中所需要使用的附图作简单地介绍, 显而易见地, 下面描述中的附图仅仅是本发明的一些实施例, 对于 本领域普通技术人员来讲, 在不付出创造性劳动的前提下, 还可以 根据这些附图获得其他的附图。
图 1 为本发明实施例提供的一种通信方法的流程图一;
图 2为本发明实施例提供的一种通信方法的流程图二;
图 3为本发明实施例提供的另一种通信方法的流程图一; 图 4为本发明实施例提供的另一种通信方法的流程图二; 图 5为本发明实施例提供的一种通信方法的流程图三;
图 6为本发明实施例提供的另一种通信方法的流程图三; 图 7为本发明实施例提供的另一种通信方法的流程图四; 图 8为本发明实施例提供的再一种通信方法的流程图一; 图 9为本发明实施例提供的再一种通信方法的流程图二; 图 10为本发明实施例提供的又一种通信方法的流程图; 图 11 为本发明实施例提供的用户设备的结构示意图一; 图 12为本发明实施例提供的基站的结构示意图一;
图 13为本发明实施例提供的用户设备的结构示意图二; 图 14为本发明实施例提供的基站的结构示意图二;
图 15为本发明实施例提供的基站的结构示意图三;
图 16为本发明实施例提供的基站的结构示意图四;
图 17为本发明实施例提供的基站的结构示意图五;
图 18为本发明实施例提供的用户设备的结构示意图三; 图 19为本发明实施例提供的基站的结构示意图六;
图 20为本发明实施例提供的基站的结构示意图七;
图 21 为本发明实施例提供的通信系统的框图一;
图 22为本发明实施例提供的通信系统的框图二。
具体实施方式
下面将结合本发明实施例中的附图, 对本发明实施例中的技术 方案进行清楚、 完整地描述, 显然, 所描述的实施例仅仅是本发明 一部分实施例, 而不是全部的实施例。
本文中描述的各种技术可用于各种无线通信系统, 例如当前 2G, 3G通信系统和下一代通信系统, 例如全球移动通信系统 ( GSM,
Global System for Mobile communications ), 码分多址 ( CDMA
Code Divis ion Multiple Access ) 系统, 时分多址 ( TDMA , Time Division Multiple Access ) 系统, 宽带码分多址(; WCDMA, Wideband
Code Division Multiple Access Wireless ) 系统, 频分多址 ( FDMA
Frequency Division Multiple Addressing ) 系统, 正交频分多址 ( 0FDMA , Orthogonal Frequency-Division Multiple Access ) 系 统,单载波频分多址( SC-FDMA, Single Carrier Frequency Divis ion Multiple Addressing ) 系统, 通用分组无线业务 ( GPRS, General Packet Radio Service )系统, 长期演进( LTE, Long Term Evolut ion ) 系统, 以及其他此类通信系统。
用户设备, 可以是无线终端也可以是有线终端, 无线终端可以 是只向用户提供语音和 /或数据连通性的设备, 具有无线连接功能的 手持式设备、 或连接到无线调制解调器的其他处理设备。 无线终端 可以经无线接入网 (例如, RAN, Radio Access Network ) 与一个或 多个核心网进行通信, 无线终端可以是移动终端, 如移动电话 (或 称为 "蜂窝" 电话) 和具有移动终端的计算机, 例如, 可以是便携 式、 袖珍式、 手持式、 计算机内置的或者车载的移动装置, 它们与 无线接入网交换语言和 /或数据。例如,个人通信业务( PCS, Personal Communication Service ) 电话、 无绳电话、 会话发起协议 ( SIP ) 话机、 无线本地环路 ( WLL, Wireless Local Loop ) 站、 个人数字 助理 ( PDA, Personal Digital Assistant ) 等设备。 无线终端也可 以称为系统、 订户单元 ( Subscriber Uni t ), 订户站 ( Subscriber Station ), 移动站 ( Mobile Station ), 移动台 ( Mobile ), 远程站 ( Remote Station ), 接入点 ( Access Point )、 远程终端 ( Remote Terminal )、 接入终端 ( Access Terminal )、 用 户 终端 ( User Terminal ), 用户代理 ( User Agent ) 或用户设备。
实施例一
本发明实施例提供一种通信方法, 涉及用户设备侧, 如图 1 所 示, 该方法可以包括:
S101、 用户设备经由第一安全密钥, 与第一基站和第二基站进 行数据传输, 第一基站与第二基站为载波聚合。
第一基站与第二基站为进行载波聚合的基站, 且第一基站和第 二基站均与用户设备进行数据传输。
当用户设备与第一基站和第二基站进行正常通讯时, 用户设备 可经由第一安全密钥, 与第一基站和第二基站进行数据传输, 以便 保证数据传输的安全性, 其中, 第一安全密钥为用户设备与第一基 站和第二基站之间进行数据传输时所使用的安全密钥。 51 02、 当用户设备与第一基站断开连接时, 用户设备维持与第 二基站的数据传输。
当用户设备与第一基站断开连接时, 用户设备可继续维持与第 二基站之间的数据传输。 例如, 当第二基站具有 PUCCH ( Phy s i c a l Up l i nk Con t r o l Cha nne l , 物理上行控制信道) 时, 即便第一基站 与用户设备断开连接, 该第二基站可以经由上述 PUCCH 与用户设备 进行数据传输。
本领域普通技术人员可以理解, 当用户设备与第一基站之间断 开连接时, 用户设备与第二基站之间、 第一基站与第二基站之间的 通讯均不会受到影响, 即用户设备与第二基站之间、 第一基站与第 二基站之间均可正常传输数据。 例如, 当用户设备与第一基站之间 断开连接时, 用户设备将继续维持与第二基站之间的数据传输, 以 保证数据传输的连续性。 具体的, 当用户设备与第一基站之间断开 连接时, 用户设备可继续通过第二基站传输用户设备与第二基站之 间的数据; 或者, 用户设备可继续通过第二基站传输用户设备与第 一基站之间及用户设备与第二基站之间的数据, 以保证数据传输的 连续性。
可选的, 本发明实施例提供的第一基站可以为宏基站, 第二基 站可以为微基站; 或者第一基站可以为微基站, 第二基站可以为宏 基站, 本发明不做限制。
需要说明的是, 一种情况下, 当宏基站和微基站都具有 PUCC H 时, 因此, 无论用户设备和宏基站断开连接, 还是和微基站断开连 接, 用户设备都可以维持与另外一个基站的数据传输, 从而保证数 据传输的连续性。
本发明实施例提供的宏基站和微基站之间的载波聚合是基站间 载波聚合的一种典型场景。 通常宏基站可指在基站间载波聚合中具 有控制功能的主基站; 微基站为传输参数及数据的辅基站。
51 03、 用户设备获取指示信息, 用于指示用户设备经由第二安 全密钥, 与第一基站进行数据传输。 当用户设备检测到用户设备与第一基站之间断开连接时, 用户 设备发起 RRC ( Radio Resource Control , 无线资源控制 ) 重建立 流程, 以与第一基站重新建立 RRC 连接。 当第一基站接收到用户设 备发送的 RRC 重建立请求消息时, 若第一基站验证并准许该请求消 息, 第一基站则发送对应于该请求消息的 RRC 重建立消息至用户设 备, 以与用户设备之间重新建立 RRC连接。
需要说明的是, 由于 RRC重建立流程伴随着安全密钥的更新, 因此, 第一基站在重新建立与用户设备之间的 RRC 连接时, 第一基 站可同时发送指示信息至用户设备, 以用于指示用户设备经由第二 安全密钥与第一基站进行数据传输。
可选的, 若第一基站为宏基站, 第二基站为微基站, 则当用户 设备与宏基站之间断开连接时, 宏基站可通过 RRC 重建立消息发送 指示消息至用户设备, 以使用户设备根据指示消息衍生第二安全密 钥 ; 相应 的 , 宏基站或 ϋ基站也可通过 PDCP ( Packet Data Convergence Protocol , 分组数据汇聚协议 ) 的 PDU ( Protocol Data Unit, 协议数据单元) 发送指示信息至用户设备, 以使用户设备根 据指示消息衍生第二安全密钥。 若第一基站为微基站, 第二基站为 宏基站, 则当用户设备与微基站之间断开连接时, 微基站可通过 RRC 重建立消息发送指示消息至用户设备, 以使用户设备根据指示消息 衍生第二安全密钥; 相应的, 宏基站或微基站可通过 PDCP的 PDU发 送指示消息至用户设备, 以使用户设备根据指示消息衍生第二安全 密钥。
具体的, 用户设备与第一基站之间的 RRC重建立流程伴随着安 全密钥的更新, 即第一基站完成 RRC 重建立流程, 并且第一基站或 第二基站发送相应的指示消息至用户设备, 以使用户设备根据该指 示消息衍生对应的安全密钥, 即第二安全密钥, 同时第一基站也衍 生对应的第二安全密钥, 至此, 伴随着 RRC 重建立流程, 用户设备 和第一基站已将第一安全密钥更新为第二安全密钥, 以便于保证后 续数据传输的安全'ί和连续性。 用户设备获取指示信息后, 可根据该指示信息衍生第二安全密 钥, 并经由第二安全密钥与第一基站进行数据传输, 即用户设备恢 复与第一基站之间的数据传输。
可选的, 用户设备可与第一基站进行安全同步, 用户设备也可 与第一基站和第二基站均进行安全同步。 具体的, 若用户设备和第 一基站之间需进行安全同步, 则第一基站可发送指示信息至用户设 备, 以与用户设备之间完成安全同步, 从而第一基站与用户设备之 间可使用第二安全密钥进行数据传输; 或者, 若用户设备和第一基 站、 第二基站之间均需进行安全同步, 则第一基站可发送指示信息 至用户设备和第二基站, 以与用户设备和第二基站之间完成安全同 步, 从而第一基站与用户设备、 第二基站与用户设备、 第一基站与 第二基站之间均可使用第二安全密钥进行数据传输, 例如, 当第一 基站为宏基站, 第二基站为微基站时, 第一基站可通过向用户设备 和微基站发送指示信息控制用户设备和微基站衍生第二安全密钥, 从而使得宏基站和用户设备之间、 微基站和用户设备之间、 宏基站 和微基站之间均使用第二安全密钥进行数据传输。
可选的, 当用户设备与第一基站和第二基站之间完成了安全同 步后, 用户设备可经由第二安全密钥, 通过用户设备与第一基站之 间重新建立的 RRC 连接进行数据传输; 同时用户设备也可经由第二 安全密钥, 继续与第二基站之间的数据传输, 从而完成数据的安全 传输, 保证了数据传输的连续性。
示例性的, 在用户设备与第一基站之间断开连接时, 用户设备 可继续维持与第二基站的数据传输, 当用户设备与第一基站之间的 RRC 连接重新建立, 且用户设备与第一基站及第二基站之间均完成 安全同步后, 用户设备与第一基站之间、 用户设备与第二基站之间 以及第一基站与第二基站之间均可使用安全同步后的第二安全密钥 对数据包进行加解密, 从而完成数据的安全传输, 进而保证数据传 输的连续性。
可以理解的是, 在数据传输过程中, 一般情况下, 数据被分成 多个数据包, 并对该多个数据包分别依次进行传输。
可选的, 若用户设备通过微基站与宏基站进行数据传输, 则微 基站可以不用更新第一安全密钥, 这是由于微基站无需对用户设备 需传输至宏基站的数据进行加解密, 只需将接收到的用户设备需传 输至宏基站的数据转发至宏基站即可。
本发明实施例还提供一种通信方法, 涉及第一基站侧, 如图 2 所示, 该方法可以包括:
S 2 01、 第一基站经由第一安全密钥与用户设备和第二基站进行 数据传输, 第一基站与第二基站为载波聚合。
第一基站与用户设备和第二基站进行正常通讯时, 第一基站经 由第一安全密钥与用户设备和第二基站进行数据传输, 其中, 第一 基站与第二基站为进行载波聚合的基站。
S 2 02、 第一基站断开与用户设备的连接, 用户设备与第二基站 之间维持数据传输。
当第一基站断开与用户设备之间的连接时, 用户设备可继续维 持与第二基站之间的数据传输。 这是由于第二基站具有 PUCCH , 可 以承担与用户设备之间的数据传输, 当第一基站与用户设备之间断 开连接时, 不会影响用户设备与第二基站之间, 以及第一基站与第 二基站之间的数据传输。
S 2 03、 第一基站经由第二安全密钥与用户设备进行数据传输, 第二安全密钥为用户设备根据获取的指示信息获知的。
第一基站与用户设备之间断开连接后, 在第一基站与用户设备 之间重新建立 RRC 连接的过程中, 同时伴随着安全密钥的更新, 当 第一基站与用户设备之间完成 RRC 连接重建立流程后, 第一基站可 经由更新后的第二安全密钥与用户设备进行数据传输, 其中, 第二 安全密钥为用户设备获取到指示信息后, 根据该指示信息获知的。 具体的, 该指示信息可用于指示用户设备经由更新后的第二安全密 钥与第一基站进行数据传输, 即用户设备与第一基站之间恢复安全 的数据传输。 本发明实施例提供一种通信方法, 通过用户设备经由第一安全 密钥, 与第一基站和第二基站进行数据传输, 第一基站与第二基站 为载波聚合, 并且, 当用户设备与第一基站断开连接时, 用户设备 维持与第二基站的数据传输, 以及用户设备获取指示信息, 用于指 示用户设备经由第二安全密钥, 与第一基站进行数据传输。 通过该 方案, 在用户设备经由第一安全密钥与第一基站和第二基站进行数 据传输时, 若用户设备与第一基站断开连接, 则用户设备可继续维 持与第二基站的数据传输, 并且当用户设备获取到指示信息后, 用 户设备可根据指示信息, 经由第二安全密钥与第一基站进行数据传 输, 从而最大限度地保证了载波聚合场景下, 用户设备与基站之间 的数据传输的连续性。
本发明实施例提供另一种通信方法, 涉及用户设备侧, 如图 3 所示, 该方法可以包括:
S 301、 用户设备与第一基站及第二基站保持通讯, 第一基站与 第二基站为载波聚合。
第一基站与第二基站为进行载波聚合的基站, 且第一基站和第 二基站均与用户设备进行数据传输。
正常情况下, 用户设备与第一基站及第二基站保持通讯, 即用 户设备与第一基站及第二基站之间进行数据传输。
可选的, 本发明实施例提供的第一基站和第二基站可以都为宏 基站; 或者第一基站为宏基站, 第二基站为微基站; 或者第一基站 为微基站, 第二基站为宏基站, 本发明不做限制。
S 302、 当确定第一基站切换至目标基站时, 用户设备向第二基 站发送 RLC ( Ra d i o L i nk Con t r o l , 无线链路控制 ) 状态 4艮告, 用 于第二基站根据 RL C 状态报告, 经由第一基站向目标基站发送指示 信息, 以便目标基站根据指示信息确定向用户设备的重传数据。
当用户设备接收到第一基站的切换命令, 即确定第一基站需切 换至目标基站时, 用户设备可向第二基站发送 RL C状态报告, 其中, RLC 状态报告可以表示用户设备与第二基站之间数据传输的状态, 以使第二基站将该 RLC 状态报告发送至第一基站后, 第一基站再将 该 RLC 状态报告转换为指示信息, 并向目标基站发送该指示信息, 以便目标基站可根据指示信息确定向用户设备的重传数据, 从而当 由第一基站切换至目标基站后, 可保证数据传输的连续性, 进而达 到无损切换的目的。
可以理解的是, 第一基站为切换前与用户设备通讯的基站, 目 标基站为切换后与用户设备通讯的基站。
本发明实施例还提供另一种通信方法, 涉及第二基站侧, 如图 4所示, 该方法可以包括:
S401、 第二基站与用户设备及第一基站保持通讯, 笫一基站与 第二基站为载波聚合。
正常情况下, 第二基站与用户设备及第一基站之间保持通讯, 其中, 第一基站与第二基站为进行载波聚合的基站。
S402、 第二基站接收来自用户设备的 RLC 状态报告, RLC 状态 报告为当确定第一基站切换至目标基站时, 用户设备发送的。
当用户设备接收到第一基站的切换命令, 即确定第一基站需切 换至目标基站时, 用户设备发送 RLC 状态报告至第二基站, 即第二 基站接收来自用户设备的 RLC 状态报告, 其中, RLC 状态报告可以 表示用户设备与第二基站之间的数据传输的状态。
S403、 第二基站根据 RLC状态报告经由第一基站向目标基站发 送指示信息, 以便目标基站根据指示信息确定向用户设备的重传数 据。
第二基站接收到来自用户设备的 RLC状态报告后, 第二基站将 该 RLC状态报告转发至第一基站, 以使第一基站将该 RLC状态报告 转换为对应的指示信息, 并将该指示信息发送至目标基站, 以便于 目标基站根据该指示信息确定向用户设备的重传数据。
可选的, 由于第一基站为切换前与用户设备通讯的基站, 因此, 第一基站可以实时地获知用户设备与第一基站之间的数据传输的状 态, 当第一基站需切换至目标基站时, 第一基站可直接将第一基站 的 RL C状态报告转换为指示信息, 并将该指示信息发送至目标基站, 以便于目标基站根据该指示信息确定向用户设备的重传数据。
本发明实施例中, 第二基站可根据用户设备上报的 RL C状态报 告, 经由第一基站发送相应的指示信息至目标基站, 以使目标基站 可根据该指示信息获知用户设备与第二基站之间的数据传输的状 态, 从而确定向用户设备的重传数据, 当由第一基站切换至目标基 站后, 可保证数据传输的连续性, 进而达到无损切换的目的。
本发明实施例提供另一种通信方法, 通过用户设备与第一基站 及第二基站保持通讯, 第一基站与第二基站为载波聚合, 并且当确 定第一基站切换至目标基站时, 用户设备向第二基站发送 R L C 状态 报告, 用于第二基站根据 R L C 状态报告, 经由第一基站向目标基站 发送指示信息, 以便目标基站根据指示信息确定向用户设备的重传 数据。 通过该方案, 当需从第一基站切换至目标基站时, 用户设备 可发送 RL C状态报告至第二基站, 以使第二基站再根据 RL C状态报 告, 经由第一基站向目标基站发送指示信息, 以便于目标基站可根 据指示信息确定向用户设备的重传数据, 从而最大限度地保证了载 波聚合场景下, 用户设备与基站之间的数据传输的连续性。
实施例二
本发明实施例提供一种通信方法, 该方法为对实施例一提供的 一种通信方法的进一步详述, 如图 5所示, 该方法可以包括:
S 5 0 1、 用户设备经由第一安全密钥, 与第一基站和第二基站进 行数据传输, 第一基站与第二基站为载波聚合。
第一基站与第二基站为进行载波聚合的基站, 且第一基站和第 二基站均与用户设备进行数据传输。
当用户设备与第一基站和第二基站进行正常通讯时, 用户设备 可经由第一安全密钥, 与第一基站和第二基站进行数据传输, 以便 保证数据传输的安全性, 其中, 第一安全密钥为用户设备与第一基 站和第二基站之间进行数据传输时所使用的安全密钥。
S 5 0 2、 当用户设备与第一基站断开连接时, 用户设备维持与第 二基站的数据传输。
当用户设备与第一基站断开连接时, 用户设备可继续维持与第 二基站之间的数据传输, 这是由于, 第二基站具有 PUC CH , 并且可 以承担与用户设备的数据传输。
本领域普通技术人员可以理解, 当用户设备与第一基站之间断 开连接时, 用户设备与第二基站之间、 第一基站与第二基站之间的 通讯均不会受到影响, 即用户设备与第二基站之间、 第一基站与第 二基站之间均可正常传输数据。 例如, 当用户设备与第一基站之间 断开连接时, 用户设备将继续维持与第二基站之间的数据传输, 以 保证数据传输的连续性。 具体的, 当用户设备与第一基站之间断开 连接时, 用户设备可继续通过第二基站传输用户设备与第二基站之 间的数据; 或者, 用户设备可继续通过第二基站传输用户设备与第 一基站之间及用户设备与第二基站之间的数据, 以保证数据传输的 连续性。
可选的, 本发明实施例提供的第一基站可以为宏基站, 第二基 站可以为微基站; 或者第一基站可以为微基站, 第二基站可以为宏 基站, 本发明不做限制。
需要说明的是, 由于宏基站和微基站都具有 PUCC H , 因此, 无 论用户设备和宏基站断开连接, 还是和微基站断开连接, 用户设备 都可以维持与另外一个基站的数据传输, 从而保证数据传输的连续 性。 具体的, 当用户设备与宏基站断开连接时, 用户设备可基于微 基站的 PUCCH维持与微基站的数据传输。
本发明实施例提供的宏基站和微基站之间的载波聚合是基站间 载波聚合的一种典型场景。 通常宏基站可指在基站间载波聚合中具 有控制功能的主基站; 微基站为传输参数及数据的辅基站。
S 5 03、 用户设备发送 RRC重建立请求消息至第一基站。
当用户设备检测到用户设备与第一基站断开连接时, 用户设备 发起 RRC 重建立流程, 即用户设备发送 RRC重建立请求消息至第一 基站。 可选的, 用户设备在发起 RRC重建立流程, 即用户设备在发送 RRC 重建立请求消息至第一基站之前, 用户设备需做的相应的处理 可以包括:
用户设备启动用户设备的定时器; 用户设备悬挂第一基站的承 载及保留第二基站进行数据传输的承载; 用户设备复位第一基站的 MAC ( Media Access Control , 媒体访问控 'J ) 西己置信息、; 用户设备 保留第二基站的辅小区的配置信息; 用户设备在用户设备与第一基 站之间使用默认的物理层配置信息、 默认的半静态调度配置信息和 默认的 MAC层主配置信息; 以及用户设备选择第一基站的任一小区, 其中, 第一基站的任一小区可以为第一基站中的任意一个小区, 即 第一基站的任一小区可以为第一基站的小区中与用户设备之间断开 连接的小区, 也可以为第一基站的其他小区。
其中, 第一基站的承载为用户设备与第一基站之间的数据传输 通道; 第二基站进行数据传输的承载为用户设备与第二基站之间的 数据传输通道。
复位 MAC可以包括初始化逻辑信道, 停止所有的定时器, 将所 有上行 HARQ ( Hybrid Automatic Repeat Req u e s t , 混合自动重传 请求) 进程的 NDI ( New Data Indicator, 新数据指示) 设置为 0; 停止正在进行的随机接入; 清空消息 3 ( 即随机接入过程中用于传 输包含 C-RNTI ( Cel 1-Radio Network Temporary Identifier , 小 区无线网络临时标识 ) MAC 控制单元或者公共控制信道 SDU ( Service Data Unit, 业务数据单元) 的消息) 的緩存; 停止 SR ( Scheduling Request, 调度请求 ), BSR ( Buffer Status Request, 緩存^ 态请求) 和 PHR ( Power Headroom Report , 功率余量才艮告) 流程; 清空所有 DL ( Down Link, 下行链路) HARQ 緩存; 释放临时 C - RNTI。
可选的, 用户设备检测用户设备与第一基站之间断开连接时, 对于第一基站侧, 第一基站侧也相应的检测到用户设备与第一基站 之间断开连接。 第一基站需做的相应的处理可以包括: 对于只在第一基站有的承载, 第一基站重用现有用户面协议处 理; 对于在第一基站和第二基站都有的承载, 第一基站只复位第一 基站的 MAC 实体; 第一基站释放第一基站的辅小区的配置信息, 并 保留第二基站的配置信息; 对于完整性保护校验失败造成的 RLF ( Radio Link Failure, 无线链路失败)需要悬挂 SRB ( S i gna 1 Ra d i o Bearer, 信令无线承载) 的相关配置; 第一基站启动第一基站的定 时器。
可选的, 对于只在第一基站有的承载可根据现有用户面协议进 行处理, 即悬挂第一基站的所有承载, 复位 MAC, 使用默认的物理 层配置信息、 默认的半静态调度配置信息和默认的 MAC 层主配置信 息。 其中, 第一基站可发送承载配置消息给第二基站, 以便于在第 二基站上发送该承载的数据。
S504、 第一基站发送对应于 RRC重建立请求消息的 RRC重建立 消息至用户设备, 以与用户设备重新建立 RRC连接。
第一基站接收到用户设备发送的 RRC重建立请求消息时, 若第 一基站验证并准入该 RRC 重建立请求消息, 第一基站则发送对应于 该 RRC重建立请求消息的 RRC重建立消息至用户设备, 以与用户设 备之间重新建立 RRC连接。
可选的, 在用户设备与第一基站之间的 RRC重建立流程中, 用 户设备可根据 RRC 重建立状态确定是否停止与第二基站之间的数据 传输。
具体的, 在用户设备与第一基站之间的 RRC重建立流程中, 若 用户设备接收到来自第一基站的 RRC 重建立拒绝消息、 用户设备的 定时器超时或用户设备选择的第一基站的任一小区未保存用户设备 的配置信息, 用户设备则停止与第二基站进行数据传输, 并释放第 二基站的辅小区的配置信息。 或者, 若用户设备与第一基站的第一 小区之间建立 RRC 连接, 用户设备则删除第二基站的配置信息, 即 停止与第二基站之间的数据传输, 其中, 第一基站的第一小区为第 一基站的任一小区中, 与和用户设备之间断开连接的小区不同的小 区。
可选的, 在用户设备与第一基站之间重新建立 RRC连接的过程 中, 若第一基站的定时器超时或第一基站未准入用户设备的 RRC 重 建立请求消息, 第一基站则删除第二基站的配置信息。
其中, 第一基站未准入 RRC重建立请求消息具体可以包括: 第一基站发送 RRC重建立拒绝消息至用户设备, 以使用户设备 接收到 RRC重建立拒绝消息后, 停止与第二基站之间进行数据传输, 并释放第二基站的辅小区的配置信息。
S 5 05、 用户设备获取指示信息, 用于指示用户设备经由第二安 全密钥, 与第一基站进行数据传输。
用户设备获取指示信息, 该指示信息可用于指示用户设备经由 第二安全密钥, 与第一基站之间进行数据传输。
需要说明的是, 由于 RRC重建立流程伴随着安全密钥的更新, 因此, 第一基站在重新建立与用户设备之间的 RRC 连接时, 第一基 站或第二基站可同时发送指示信息至用户设备, 以用于指示用户设 备经由第二安全密钥与第一基站进行数据传输。
可选的, 若第一基站为宏基站, 第二基站为微基站, 则当用户 设备与宏基站之间断开连接时, 宏基站可通过 RRC 重建立消息发送 指示消息至用户设备, 以使用户设备根据指示消息衍生第二安全密 钥;相应的,微基站也可通过 PDCP的 PDU发送指示信息至用户设备, 以使用户设备根据指示消息衍生第二安全密钥。 若第一基站为微基 站, 第二基站为宏基站, 则当用户设备与微基站之间断开连接时, 微基站可通过 RRC 重建立消息发送指示消息至用户设备, 以使用户 设备根据指示消息衍生第二安全密钥; 相应的, 宏基站可通过 PDCP 的 PDU 发送指示消息至用户设备, 以使用户设备根据指示消息衍生 第二安全密钥。
具体的, 用户设备与第一基站之间的 RRC重建立流程伴随着安 全密钥的更新, 即第一基站完成 RRC 重建立流程, 并且第一基站或 第二基站发送相应的指示消息至用户设备, 以使用户设备根据该指 示消息衍生对应的安全密钥, 即第二安全密钥, 同时第一基站也衍 生对应的第二安全密钥, 至此, 伴随着 RRC 重建立流程, 用户设备 和第一基站已将第一安全密钥更新为第二安全密钥, 以便于保证后 续数据传输的安全'ί和连续性。
可选的, 指示信息可以包括安全同步指示或 PDCP的 PDU。
用户设备获取指示信息后, 可根据该指示信息衍生第二安全密 钥, 并经由第二安全密钥与第一基站进行数据传输, 即用户设备恢 复与第一基站之间的数据传输。
可选的, 用户设备与第一基站进行安全同步后, 即用户设备与 第一基站之间使用第二安全密钥进行数据传输, 用户设备与第二基 站也可进行安全同步。 具体的, 若由第一基站发送指示信息至用户 设备, 则第一基站可同时将该指示信息发送至第二基站, 以便于第 二基站也可根据该指示信息将第一安全密钥更新为第二安全密钥, 从而完成安全同步; 或者, 若由第二基站发送指示信息至用户设备, 则第二基站可同时将该指示信息发送至第一基站, 以便于第一基站 也可根据该指示信息将第一安全密钥更新为第二安全密钥, 从而完 成安全同步。
可选的, 当用户设备与第一基站之间和第二基站之间完成了安 全同步时, 用户设备可经由第二安全密钥, 通过用户设备与第一基 站之间重新建立的 RRC 连接进行数据传输; 同时用户设备也可经由 第二安全密钥, 继续与第二基站之间的数据传输, 从而完成数据的 安全传输, 保证了数据传输的连续性。
示例性的, 在用户设备与第一基站之间断开连接时, 用户设备 可继续维持与第二基站的数据传输, 当用户设备与第一基站之间的 RRC 连接重新建立, 且用户设备与第一基站及第二基站之间均完成 安全同步后, 用户设备与第一基站之间、 用户设备与第二基站之间 以及第一基站与第二基站之间均可使用安全同步后的第二安全密钥 对数据包进行加解密, 从而完成数据的安全传输, 进而保证数据传 输的连续性。 可以理解的是, 在数据传输过程中, 一般情况下, 数据被分成 多个数据包, 并对该多个数据包分别依次进行传输。
可选的, 若用户设备通过微基站与宏基站进行数据传输, 则微 基站可以不用更新第一安全密钥, 这是由于微基站无需对用户设备 需传输至宏基站的数据进行加解密, 只需将接收到的用户设备需传 输至宏基站的数据转发至宏基站即可。
可选的, 当第一基站发生无线链路失败或切换时, 用户设备可 获取指示信息。 其中, 第一基站发生无线链路失败或切换的场景可 以包括:
( 10 ) 用户设备检测到物理层链接失败。
( 11 ) 用户设备随机接入第一基站失败。
( 12 ) 用户设备检测到第一基站传递的 DRB ( Data Radio Bearer, 数据无线承载) 或 SRB达到 RLC的最大重传次数。
( 13 ) 用户设备检测到 RRC连接重配失败。
( 14 ) 用户设备检测到第一基站切换失败。
可选的, 用户设备获取指示信息的方法可以为下述的一种: ( 1 ) 用户设备接收安全同步指示, 其中, 安全同步指示包括用 于承载数据包的承载的 SN ( Sequence Number, 序列号), 安全同步 指示可用于指示从收发该数据包开始, 用户设备经由第二安全密钥 与第一基站进行数据传输。
( 2 ) 用户设备接收第一基站或第二基站发送的 PDCP 的 PDU, 该 PDU可用于指示从收发该 PDU开始, 用户设备经由第二安全密钥 与第一基站进行数据传输。
上述( 1 ) 中, 用户设备可通过接收第一基站发送的 RRC重建立 消息接收安全同步指示, 即 RRC重建立消息中包括安全同步指示。
可选的, 安全同步指示还可以包括承载的 HFN ( Hyper frame number, 超帧号), 该承载的 HFN可用于标识承载数据包的该承载。
可选的, 用户设备接收到 RRC重建立消息后, 用户设备可根据 RRC重建立消息中携带的安全同步指示衍生第二安全密钥。 上述 ( 2 ) 中, 具体的, 第一基站可通过用户面机制, 如 PDCP 的 PDU 头来指示使用第二安全密钥的数据包, 以使得用户设备从收 发该 PDU开始, 经由第二安全密钥与第一基站进行数据传输。
具体的, 第一基站通过 PDU头来指示使用第二安全密钥的数据 包的方法可以包括:
a、第一基站可使用现有的用户面数据 PDU的预留位来指示使用 第二安全密钥的数据包。
以具有 12b it (比特) 的 PDCP SN 的现有的用户面数据 PDU 的 格式为例, 如表 1 所示, 其中, D/C位可用来指示该 PDU是控制 PDU 还是数据 PDU, 如若为 "0", 则表示为控制 PDU, 若为 "1", 则表示 为数据 PDU; R为预留位; PDCP SN为该数据 PDU的序列号, Data为 数据。 从表 1 可以看出, 现有的用户面数据 PDU有 3个预留位, 可 以使用其中的一个来标识新安全激活指示, 用户设备接收到第一基 站的数据 PDU后, 用户设备可根据数据 PDU 中的新安全激活指示衍 生第二安全密钥, 并根据该第二安全密钥从该 PDCP 的 SDU 开始使 用第二安全密钥进行加解密。 由于数据 PDU 头不加密, 因此, 用户 设备与第一基站可以明确知道第二安全密钥起始的 PDCP SN。
表 1
D/C( 1 ) R R R PDCP SN (高 4位)
PDCP SN (低 8位)
Data
示例性的, 如表 2所示, 若 SC ( Security Control, 安全控制 ) 指示从该数据 PDU开始使用第二安全密钥, 则发送端 PDCP层和接收 端 PDCP层对从该数据 PDU开始的数据包使用第二安全密钥进行加密 和解密, 具体可以包括:
发送端 PDCP层使用第二安全密钥对数据包进行加密,并在数据 PDU 头上增加如表 1 所示的 SC指示; 接收端 PDCP层从该数据 PDU 头中读取 SC指示, 并知道从该数据包开始使用第二安全密钥, 从而 接收端 PDCP层使用第二安全密钥对该数据包进行解密。 表 2
D/C( 1 ) R R SC PDCP SN (高 4位)
PDCP SN (低 8位)
Da ta
b、第一基站可构造新类型的控制 PDU来指示使用第二安全密钥 的数据包。
PDU 包括数据 PDU和控制 PDU,其中,数据 PDU可用于传输 PDCP 的 SDU的 SN以及相关数据; 控制 PDU可用于传输 PDCP的 PDU的控 制信息, 如 PDU状态报告及 PDU头压缩控制信息等。
如表 3所示, 为新定义的新类型的控制 PDU的格式。 其中, D/C 位可用来指示该 PDU 是控制 PDU还是数据 PDU, 如若为 " 0" , 则表 示为控制 PDU,若为 " 1" , 则表示为数据 PDU; R为预留位; FSC( First New Security, 新安全指示) 用于指示 PDCP的 SDU开始使用第二安 全密钥的 PDCP SN或者 Count值; PDU Type可用于指示控制 PDU的 类型。
表 3
Figure imgf000034_0001
特别的, 3bit 的控制 PDU Type可扩展为如表 4所示的形式
表 4
Figure imgf000034_0002
本发明实施例提供的一种通信方法, 当用户设备与第一基站之 间断开连接时, 用户设备可继续维持与第二基站之间的数据传输, 并在重新建立 RRC 连接的过程中更新安全密钥, 从而在重新建立用 户设备与第一基站之间的 RRC 连接后, 用户设备可使用更新后的第 二安全密钥与第一基站进行数据传输, 从而保证数据传输的连续性。
本发明实施例提供一种通信方法, 通过用户设备经由第一安全 密钥, 与第一基站和第二基站进行数据传输, 第一基站与第二基站 为载波聚合, 并且, 当用户设备与第一基站断开连接时, 用户设备 维持与第二基站的数据传输, 以及用户设备获取指示信息, 用于指 示用户设备经由第二安全密钥, 与第一基站进行数据传输。 通过该 方案, 在用户设备经由第一安全密钥与第一基站和第二基站进行数 据传输时, 若用户设备与第一基站断开连接, 则用户设备可继续维 持与第二基站的数据传输, 并且当用户设备获取到指示信息后, 用 户设备可根据指示信息, 经由第二安全密钥与第一基站进行数据传 输, 从而最大限度地保证了载波聚合场景下, 用户设备与基站之间 的数据传输的连续性。
本发明实施例提供另一种通信方法, 该方法为对实施例一提供 的另一种通信方法的进一步详述, 对应于第一基站发送至用户设备 的下行数据的通信方法, 如图 6所示, 该方法可以包括:
S 6 01、 用户设备与第一基站及第二基站保持通讯, 第一基站与 第二基站为载波聚合。
第一基站与第二基站为进行载波聚合的基站, 且第一基站和第 二基站均与用户设备进行数据传输。
正常情况下, 用户设备与第一基站及第二基站保持通讯, 即用 户设备与第一基站及第二基站之间进行数据传输。
可选的, 本发明实施例提供的第一基站和第二基站可以都为宏 基站; 或者第一基站为宏基站, 第二基站为微基站; 或者第一基站 为微基站, 第二基站为宏基站, 本发明不做限制。
S 6 02、 当确定第一基站切换至目标基站时, 用户设备向第二基 站发送 RL C状态报告。
当用户设备接收到第一基站的切换命令, 即确定第一基站需切 换至目标基站时, 用户设备可向第二基站发送 RL C状态报告, 其中, RLC状态报告可以表示用户设备与第二基站之间的数据传输的状态。 可以理解的是, 第一基站为切换前与用户设备通讯的基站, 目 标基站为切换后与用户设备通讯的基站。
可选的, 用户设备向第二基站发送 RLC状态报告的场景可以为 下述的一种:
( 1 ) 当用户设备与第一基站之间发生无线链路失败时, 用户设 备可向第二基站发送 RLC状态报告。
( 2 ) 当用户设备接收来自第一基站的 RLC状态上报指示时, 用 户设备可向第二基站发送 RLC状态报告。
( 3 )当用户设备接收来自第一基站的切换命令但第二基站保持 连接的指示时, 用户设备可向第二基站发送 RLC状态报告。
其中, 用户设备与第一基站之间发生无线链路失败的场景可以 为下述的一种:
( 10 ) 用户设备检测到物理层链接失败。
( 11 ) 用户设备随机接入第一基站失败。
( 12 )用户设备检测到第一基站传递的 RB或 SRB达到 RLC的最 大重传次数。
( 13 ) 用户设备检测到 RRC连接重配失败。
( 14 ) 用户设备检测到第一基站切换失败。
需要说明的是, 上述 RLC状态上报指示可以为第一基站需切换 至目标基站时, 第一基站下发切换命令至用户设备时, 携带在切换 命令中发送的, 同时第一基站在下发 RLC 状态上报指示至用户设备 后, 第一基站可启动第一基站的定时器, 以用于在发送 RLC 状态报 告的过程中计时。
可选的, RLC 状态上报指示可以指示用户设备与第一基站之间 的单独的承载, 也可以指示全部的 AM ( Acknowledged Mode , 确认 模式) 模式的承载, 本发明不做限制。
可选的, 用户设备向第二基站发送 RLC状态报告的同时, 用户 设备也可启动用户设备的定时器, 以便于在用户设备发送 RLC 状态 才艮告的过程中计时。
S 6 03、 第二基站将 RLC状态报告转发至第一基站。
第二基站接收到用户设备发送的 RLC状态报告后, 第二基站再 将该 RLC状态报告转发至第一基站。
S 6 04、 第一基站将 RLC状态报告转换为指示信息。
第一基站接收到第二基站转发的 RLC状态报告后, 第一基站将 该 RL C状态报告转换为指示信息。
可选的, 第一基站转换后的指示信息可以包括 PDCP S N值。 具 体的, 用户设备将 RLC 状态报告发送至第二基站后, 第二基站再在 一定时间内将该 RLC状态报告转发至第一基站,由第一基站将该 RL C 状态报告转换为 PDCP S N值, 即去掉 RL C 的 PDCP 的 PDU 头, 并将 PDCP的 PDU转化为 PDCP的 SDU , 从而从 PDCP的 SDU头中读取 PDCP SN值。
S 6 05、 第一基站将指示信息发送至目标基站。
第一基站将该 RL C状态报告转换为指示信息后, 第一基站将该 指示信息发送至目标基站, 即将读取的 PDCP S N值发送至目标基站, 以使得目标基站可根据该 PDCP S N值确定向用户设备的重传数据。
S 6 06、 目标基站根据指示信息确定向用户设备的重传数据。 目标基站接收到第一基站发送的指示信息, 即 PDCP S N值后, 目标基站可根据该 PDCP SN 值确定向用户设备的重传数据, 从而当 由第一基站切换至目标基站后, 可保证数据传输的连续性, 进而达 到无损切换的目的。
特别的, 当第一基站的定时器超时后, 第一基站还未接收到第 二基站的 RLC状态报告, 第一基站可直接将第一基站自身的 RL C状 态报告转化为 PDCP SN值, 并将该 PDCP S N值发送至目标基站, 以 使得目标基站根据该 PDCP SN值确定向用户设备的重传数据, 从而 保证切换前和切换后的数据传输的连续性。
可以理解的是, 第一基站为切换前的基站, 目标基站为切换后 的基站。 可选的, 若用户设备发送完 RLC状态报告或用户设备的定时器 超时, 用户设备则可释放第一基站的配置信息, 以便于与第二基站 继续进行数据传输。
本发明实施例还提供另一种通信方法, 对应于用户设备发送至 第一基站的上行数据的通信方法, 如图 7 所示, 当确定第一基站切 换至目标基站时, 第一基站则发送请求消息至第二基站, 以使第二 基站将 RLC状态报告发送至第一基站。
在本实施例中,上述请求消息可以包括上报緩存数据请求消息。 例如, 第二基站可以根据上报緩存数据请求消息将上述 RLC 状态报 告发送至第一基站。 一种应用场景为, 第一基站可以启动定时器, 当第一基站接收完 RLC 状态报告或第一基站的定时器超时后, 第一 基站可以将该 RLC状态报告转化为 PDCP SN值, 并将该 PDCP SN值 发送至目标基站, 以使目标基站可根据该 PDCP SN 值确定向用户设 备的重传数据。 另一种场景为, 在第一基站接收完 RLC 状态报告时 或接收 RLC状态报告的同时, 第一基站即可同步将该 RLC状态报告 转化为 PDCP SN值。此时,在第一基站确定向目标基站发送上述 PDCP SN值时, 可以直接将已经生成的 PDCP SN值发送给目标基站, 减少 时延。
在本实施例中, 第二基站可在该 RLC状态报告中增加 "结束标 志" 来指示该 RLC 状态报告已发送完成, 从而当第一基站接收到该 "结束标志" 时, 可获知该 RLC 状态报告已发送完成, 进而第一基 站将接收到的该 RLC 状态报告转化为 PDCP SN值, 并将该 PDCP SN 值发送至目标基站, 以使目标基站可根据该 PDCP SN值确定向用户 设备的重传数据, 从而保证切换前和切换后数据传输的连续性。
本发明实施例提供的另一种通信方法, 通过用户设备与第一基 站及第二基站保持通讯, 第一基站与第二基站为载波聚合, 并且当 确定第一基站切换至目标基站时, 用户设备向第二基站发送 RLC 状 态报告, 用于第二基站根据 RLC 状态报告, 经由第一基站向目标基 站发送指示信息, 以便目标基站根据指示信息确定向用户设备的重 传数据。
在本实施例中, 当需从第一基站切换至目标基站时, 用户设备 可发送 RL C状态报告至第二基站, 以使第二基站再根据 RLC状态报 告, 经由第一基站向目标基站发送指示信息, 以便于目标基站可根 据指示信息确定向用户设备的重传数据, 从而最大限度地保证了载 波聚合场景下, 用户设备与基站之间的数据传输的连续性。
本发明实施例提供再一种通信方法,例如当第一基站为宏基站, 第二基站为微基站时, 宏基站可通过 RRC 重建立状态 ( RRC 重建立 成功或者失败) 来指示微基站删除原有的配置, 或者指示用户设备 和微基站进行安全同步。
示例性的, 如图 8所示, 以 RRC重配置失败为例, 当用户设备 与宏基站之间、 宏基站与微基站之间、微基站与用户设备之间的 RRC 连接需要进行修改如建立、 修改或释放 RB ( Ra d i o Be a r e r , 无线承 载), 即重新配置时, 宏基站可分别发送 RRC重配置命令至用户设备 和微基站。 若用户设备发生无线链路失败, 即 RRC 重配置失败, 如 用户设备无法接收到宏基站下发的 RRC 重配置命令或无法生效 RRC 重配置命令中的配置, 则当宏基站检测到用户设备在宏基站发生无 线链路失败后, 宏基站可向微基站发送 RRC 重配置取消命令, 以使 得微基站可恢复到重配置之前的配置来进行数据传输。 当用户设备 在宏基站发生无线链路失败后, 用户设备发起 RRC 重建立流程, 具 体的 RRC 重建立流程在上述实施例中已经进行了详细地描述, 此处 不再赘述。
可选的, 当用户设备发生无线链路失败时, 用户设备可自主恢 复到重配置之前的配置。
以下分别对 RRC重建立失败和 RRC重建立成功两个场景进行说 明:
(一)、宏基站通过 RRC重建立失败来指示微基站删除原有的配 置。
如图 8所示, 当宏基站确定 RRC重建立失败时, 如宏基站确定 宏基站的定时器超时或用户设备的 RRC 重建立请求消息未被宏基站 准入, 宏基站则发送删除命令至微基站, 以使微基站停止数据传输, 并删除用户设备的相关配置, 这是由于若宏基站与用户设备之间的 RRC 重建立失败, 则宏基站无法下发控制信令至用户设备, 因此, 用户设备与微基站之间的数据传输也无法继续维持。
(二)、宏基站可通过 RRC重建立成功指示用户设备和微基站进 行安全同步。
在此说明,全配置方式例如为将原有的用户设备与宏基站之间、 用户设备与微基站之间的 RB 的配置删除, 并对这些 RB 完全进行重 新配置。
示例性的, 如图 9所示, 当宏基站确定 RRC重建立成功时, 宏 基站确定更新安全密钥,宏基站可使用全配置的方式来重新配置 RB , 即宏基站分别向用户设备和微基站下发全配置指示,以重新配置 RB , 这样可避免对微基站的删除, 从而减少微基站的删除和增加所带来 的时延。 用户设备和微基站可根据宏基站下发的全配置指示来更新 安全密钥, 即用户设备和微基站可根据全配置指示衍生第二安全密 钥, 完成安全同步, 并使用第二安全密钥对相应的数据包进行加解 密, 从而对数据进行完整性保护, 完成数据的安全传输。 可选的, 该全配置指示可以为隐含式的指示, 即用户设备和微基站接收大量 含有全配置指示的消息后即可认为需更新安全密钥。
可选的, 宏基站可将全配置指示携带在 RRC重建立消息中发送 至用户设备, 也可在发送 RRC 重建立消息后发送至用户设备, 本发 明不做限制。
本发明实施例提供又一种通信方法, 包括: 当第一基站发生无 线链路失败或切换时, 在一定的时间内, 第一基站和用户设备对数 据包分别使用第一安全密钥和第二安全密钥进行双解, 其中, 第一 安全密钥为旧密钥, 第二安全密钥为新密钥。
示例性的, 如图 1 0所示, 第一基站发送使用双密钥指示和使用 双密钥解密数据包的时间至用户设备。 用户设备接收到使用双密钥 指示和使用双密钥解密数据包的时间后, 用户设备可根据使用双密 钥指示, 在指示的时间内分别使用第一安全密钥和第二安全密钥对 数据包进行解密及完整性验证。 当用户设备发现第一基站使用第二 安全密钥进行加密, 即用户设备使用第二安全密钥完成对数据包的 解密时, 用户设备则使用第二安全密钥对需发送至第一基站的数据 包进行加密和完整性保护, 从而保证数据的安全传输, 进而保证数 据传输的连续性。
可选的, 第一基站可以在发送切换命令或 RRC重建立消息至用 户设备时发送使用双密钥指示和使用双密钥解密数据包的时间, 也 可在发送切换命令或 RRC 重建立消息后发送使用双密钥指示和使用 双密钥解密数据包的时间, 本发明不做限制。
实施例三
如图 11所示, 本发明实施例提供一种用户设备 1, 对应于本发 明实施例提供的一种通信方法, 该用户设备 1 可以包括:
处理单元 10, 用于经由第一安全密钥, 与第一基站和第二基站 进行数据传输, 以及当所述用户设备与所述第一基站断开连接时, 维持与所述第二基站的数据传输, 所述第一基站与所述第二基站为 载波聚合。
获取单元 11, 用于获取指示信息, 用于指示所述处理单元 10 经由第二安全密钥, 与所述第一基站进行数据传输。
可选的, 所述获取单元 11, 具体用于接收安全同步指示; 其中, 所述安全同步指示包括用于承载数据包的承载的 SN, 所 述安全同步指示用于指示从收发所述数据包开始, 所述处理单元 10 经由所述第二安全密钥与所述第一基站进行数据传输。
可选的,所述获取单元 11,还用于接收所述第一基站发送的 RRC 重建立消息, 所述 RRC重建立消息包括所述安全同步指示。
可选的,所述获取单元 11接收的所述安全同步指示还包括承载 的 HFN, 用于标识承载所述数据包的所述承载。
可选的, 所述获取单元 11, 具体用于接收所述第一基站或所述 第二基站发送的 PDCP的 PDU, 所述 PDU用于指示从收发所述 PDU开 始, 所述处理单元 10经由所述第二安全密钥与所述第一基站进行数 据传输。
可选的, 所述获取单元 11 , 具体用于当所述第一基站发生无线 链路失败或切换时, 获取所述指示信息。
可选的, 所述处理单元 10, 还用于在所述获取单元 11 接收到 所述 RRC重建立消息后, 衍生所述第二安全密钥。
可选的, 当所述第一基站为宏基站, 所述第二基站为微基站时, 所述处理单元 10, 具体用于当所述用户设备与所述宏基站断开连接 时, 基于所述微基站的 PUCCH维持与所述微基站的数据传输。
本发明的实施例提供一种用户设备, 该用户设备经由第一安全 密钥, 与第一基站和第二基站进行数据传输, 以及当用户设备与第 一基站断开连接时, 该用户设备维持与第二基站的数据传输, 第一 基站与第二基站为载波聚合, 并且该用户设备获取指示信息, 用于 指示该用户设备经由第二安全密钥, 与第一基站进行数据传输。 通 过该方案, 在用户设备经由第一安全密钥与第一基站和第二基站进 行数据传输时, 若用户设备与第一基站断开连接, 则用户设备可继 续维持与第二基站的数据传输, 并且当用户设备获取到指示信息后, 用户设备可根据指示信息, 经由第二安全密钥与第一基站进行数据 传输, 从而最大限度地保证了载波聚合场景下, 用户设备与基站之 间的数据传输的连续性。
如图 12所示, 本发明实施例提供一种基站 2, 对应于本发明实 施例提供的一种通信方法, 该基站 2 可以包括:
传输单元 20, 用于经由第一安全密钥与用户设备和第二基站进 行数据传输, 其中, 所述基站与所述第二基站为载波聚合。
处理单元 21 , 用于断开与所述用户设备的连接, 其中, 所述用 户设备与所述第二基站之间维持数据传输。
发送单元 22, 用于向所述用户设备发送指示信息, 用于指示所 述传输单元 20经由第二安全密钥与所述基站进行数据传输。 可选的, 所述指示信息包括安全同步指示, 所述安全同步指示 包括用于承载数据包的承载的 SN。 其中, 所述传输单元 20, 具体用 于从收发所述数据包开始, 经由所述第二安全密钥与所述用户设备 进行数据传输。
可选的, 所述发送单元 22, 用于发送 RRC重建立消息至所述用 户设备, 所述 RRC重建立消息包括所述安全同步指示。
可选的, 所述安全同步指示还包括承载的 HFN, 用于标识承载 所述数据包的所述承载。
可选的, 所述指示信息包括 PDCP的 PDU。 其中, 所述传输单元 20, 具体用于从收发所述 PDU 开始, 经由所述第二安全密钥与所述 用户设备进行数据传输。
可选的, 所述处理单元 21 , 具体用于当所述第一基站发生无线 链路失败或切换时, 断开与所述用户设备的连接。
可选的, 所述基站为宏基站, 所述第二基站为微基站。
本发明的实施例提供一种基站, 该基站经由第一安全密钥与用 户设备和第二基站进行数据传输, 其中, 该基站与第二基站为载波 聚合, 并且该基站断开与用户设备的连接, 其中, 用户设备与第二 基站之间维持数据传输, 以及该基站向用户设备发送指示信息, 用 于指示用户设备经由第二安全密钥与该基站进行数据传输。 通过该 方案, 在用户设备经由第一安全密钥与第一基站和第二基站进行数 据传输时, 若用户设备与第一基站断开连接, 则用户设备可继续维 持与第二基站的数据传输, 并且当用户设备获取到指示信息后, 用 户设备可根据指示信息, 经由第二安全密钥与第一基站进行数据传 输, 从而最大限度地保证了载波聚合场景下, 用户设备与基站之间 的数据传输的连续性。
如图 13所示, 本发明实施例提供一种用户设备 1 , 对应于本发 明实施例提供的另一种通信方法 (第一基站发送至用户设备的下行 数据的通信方法), 该用户设备 1 可以包括:
处理单元 10, 用于与第一基站及第二基站保持通讯, 所述第一 基站与所述第二基站为载波聚合。
发送单元 12, 用于当确定所述第一基站切换至目标基站时, 向 所述第二基站发送 RLC 状态报告, 用于所述第二基站根据所述 RLC 状态报告, 经由所述第一基站向所述目标基站发送指示信息, 以便 所述目标基站根据所述指示信息确定向所述用户设备的重传数据。
可选的, 所述处理单元 10, 还用于在所述发送单元 12 向所述 第二基站发送所述 RLC 状态报告时, 启动所述用户设备的定时器, 以及若所述发送单元 12发送完所述 RLC状态报告或所述用户设备的 定时器超时, 则释放所述第一基站的配置信息。
可选的, 所述发送单元 12, 具体用于当所述用户设备与所述第 一基站之间发生无线链路失败时, 向所述第二基站发送所述 RLC 状 态报告。
或者, 当所述用户设备接收来自所述第一基站的 RLC状态上报 指示时, 向所述第二基站发送所述 RLC状态报告。
或者, 当所述用户设备接收来自所述第一基站的切换命令且接 收所述第二基站与所述用户设备保持连接的指示时, 向所述第二基 站发送所述 RLC状态 ^艮告。
本发明的实施例提供一种用户设备, 该用户设备与第一基站及 第二基站保持通讯, 第一基站与第二基站为载波聚合, 并且当确定 第一基站切换至目标基站时, 该用户设备向第二基站发送 RLC 状态 报告, 用于第二基站根据 RLC 状态报告, 经由第一基站向目标基站 发送指示信息, 以便目标基站根据指示信息确定向用户设备的重传 数据。 通过该方案, 当需从第一基站切换至目标基站时, 用户设备 可发送 RLC状态报告至第二基站, 以使第二基站再根据 RLC状态报 告, 经由第一基站向目标基站发送指示信息, 以便于目标基站可根 据指示信息确定向用户设备的重传数据, 从而最大限度地保证了载 波聚合场景下, 用户设备与基站之间的数据传输的连续性。
如图 14所示, 本发明实施例提供一种基站 3, 对应于本发明实 施例提供的另一种通信方法 (第一基站发送至用户设备的下行数据 的通信方法), 该基站 3 可以包括:
处理单元 30, 用于与用户设备及第一基站保持通讯, 所述第一 基站与所述基站为载波聚合。
接收单元 31 , 用于接收来自所述用户设备的 RLC状态报告, 所 述 RLC 状态报告为当确定所述第一基站切换至目标基站时, 所述用 户设备发送的。
发送单元 32, 用于根据所述接收单元 31 接收的所述 RLC状态 报告经由所述第一基站向所述目标基站发送指示信息, 以便所述目 标基站根据所述指示信息确定向所述用户设备的重传数据。
可选的, 所述接收单元 31 , 具体用于当所述用户设备与所述第 一基站之间发生无线链路失败时,接收来自所述用户设备的所述 RLC 状态报告。
或者, 当所述用户设备接收来自所述第一基站的 RLC状态上报 指示时, 接收来自所述用户设备的所述 RLC状态报告。
或者, 当所述用户设备接收来自所述第一基站的切换命令且接 收所述第二基站与所述用户设备保持连接的指示时, 接收来自所述 用户设备的所述 RLC状态报告。
可选的, 所述发送单元 32发送的所述指示信息包括 PDCP SN。 其中, 所述发送单元 32, 具体用于根据所述接收单元 31 接收的所 述 RLC 状态报告经由所述第一基站向所述目标基站发送所述 PDCP SN。
本发明的实施例提供一种基站, 该基站与用户设备及第一基站 保持通讯, 第一基站与该基站为载波聚合, 并且该基站接收来自用 户设备的 RLC 状态报告, RLC 状态报告为当确定第一基站切换至目 标基站时, 用户设备发送的, 以及该基站根据接收的 RLC 状态报告 经由第一基站向目标基站发送指示信息, 以便目标基站根据指示信 息确定向用户设备的重传数据。 通过该方案, 当需从第一基站切换 至目标基站时, 用户设备可发送 RLC 状态报告至第二基站, 以使第 二基站再根据 RLC 状态报告, 经由第一基站向目标基站发送指示信 息, 以便于目标基站可根据指示信息确定向用户设备的重传数据, 从而最大限度地保证了载波聚合场景下, 用户设备与基站之间的数 据传输的连续性。
如图 15所示, 本发明实施例提供一种基站 2, 对应于本发明实 施例提供的另一种通信方法 (用户设备发送至第一基站的上行数据 的通信方法), 该基站 2 可以包括:
发送单元 22, 用于当确定所述基站切换至目标基站时, 发送请 求消息至第二基站, 其中, 所述请求消息包括上报緩存数据请求消 息;
接收单元 23, 用于接收来自第二基站根据所述上报緩存数据请 求消息发送的 RLC状态报告。
上述基站还包括处理单元 21 , 用于当所述发送单元 22 发送所 述请求消息时启动所述基站的定时器。
所述处理单元 21 , 还用于当所述接收单元 23接收完 RLC状态 报告或所述基站的定时器超时后, 将所述 RLC状态报告转化为 PDCP SN值。
所述发送单元 22, 还用于发送 PDCP SN值至目标基站, 以使目 标基站可根据该 PDCP SN值确定向用户设备的重传数据。
可选的, 所述接收单元 23接收的所述 RLC状态报告中包括 "结 束标志", 用于指示所述 RLC状态报告发送完成。
可选的, 所述处理单元 21 , 具体用于根据所述接收单元 23 接 收的所述 "结束标志", 将所述 RLC状态 ^艮告转化为 PDCP SN值。
本发明的实施例提供一种基站, 该基站可通过发送请求消息至 第二基站, 以请求第二基站上报第二基站緩存的数据对应的 RLC 状 态报告, 并且该基站将该 RLC状态报告转换为 PDCP SN值, 以及该 基站将该 PDCP SN值发送至目标基站, 以使目标基站可根据该 PDCP SN值确定向用户设备的重传数据, 从而保证切换前和切换后数据传 输的连续性, 进而最大限度地保证了载波聚合场景下, 用户设备与 基站之间的数据传输的连续性。 如图 1 6所示, 本发明实施例提供一种基站 4 , 对应于本发明实 施例提供的再一种通信方法, 该基站 4 可以包括:
发送单元 4 0 , 用于当 RRC连接需进行修改时, 发送 RRC重配置 命令至用户设备和微基站, 并当所述用户设备发送无线链路失败时, 发送 RRC重配置取消命令至所述微基站。
接收单元 4 1 , 用于接收来自用户设备的 RRC重建立请求消息。 所述发送单元 4 0 , 还用于发送与所述 RRC重建立请求消息对应 的 RRC重建立消息至所述用户设备。
可选的, 所述发送单元 4 0 , 还用于当所述基站确定 RRC重建立 失败时, 发送删除命令至所述微基站, 以使微基站停止数据传输, 并删除所述用户设备的相关配置。
可选的, 所述发送单元 4 0 , 还用于当所述基站确定 RRC重建立 成功且需更新安全密钥时, 发送全配置指示至用户设备和微基站, 以使得用户设备和微基站重新配置 RB , 并根据所述全配置指示衍生 第二安全密钥, 以及使用所述第二安全密钥对数据包进行加解密。
可选的, 所述全配置指示为隐含式的指示。
本发明的实施例提供一种基站, 该基站可通过用户设备与该基 站之间的 RRC 重建立状态来指示微基站删除原有的配置, 或者指示 用户设备和微基站进行安全同步。 该基站可在用户设备与该基站之 间的 RRC 重建立失败时, 指示微基站删除原有的配置, 或者该基站 可在用户设备与该基站之间的 RRC 重建立成功时, 该基站指示用户 设备和微基站进行安全同步,从而无论用户设备与该基站之间的 RRC 重建立失败还是成功, 都能够保证用户设备与微基站之间的数据传 输的连续性, 进而最大限度地保证了载波聚合场景下, 用户设备与 基站之间的数据传输的连续性。
如图 1 7所示, 本发明的实施例提供一种基站 2 , 对应于本发明 实施例提供的又一种通信方法, 该基站 2可以包括:
发送单元 22 , 用于当所述基站发生无线链路失败或切换时, 发 送使用双密钥指示和使用双密钥解密数据包的时间至用户设备, 以 使用户设备可根据所述使用双密钥指示, 在指示的时间内分别使用 第一安全密钥和第二安全密钥对数据包进行解密及完整性验证。
接收单元 23, 用于接收来自用户设备的加密数据包, 所述加密 数据包为用户设备使用第一安全密钥或第二安全密钥对数据包加密 后所得。
处理单元 21 , 用于根据第一安全密钥或第二安全密钥对所述加 密数据包进行解密。
可选的, 发送单元 22, 具体用于在发送切换命令或 RRC重建立 消息至用户设备时发送所述使用双密钥指示和所述使用双密钥解密 数据包的时间至用户设备。
可选的, 发送单元 22, 具体用于在发送切换命令或 RRC重建立 消息后发送所述使用双密钥指示和所述使用双密钥解密数据包的时 间至用户设备。
本发明的实施例提供一种基站, 该基站可以在发生无线链路失 败或切换时向用户设备发送使用双密钥指示和使用双密钥解密数据 包的时间至用户设备, 以使用户设备可使用双密钥指示, 在指示的 时间内分别使用第一安全密钥和第二安全密钥对数据包进行解密及 完整性验证, 从而当用户设备使用第一安全密钥或第二安全密钥对 数据包进行解密后, 用户设备可使用解密成功的安全密钥对数据包 进行加密, 从而保证用户设备与第一基站之间的数据传输的连续性, 进而最大限度地保证了载波聚合场景下, 用户设备与基站之间的数 据传输的连续性。
实施例四
如图 18所示, 本发明实施例提供一种用户设备, 对应于本发明 实施例提供的一种通信方法, 该用户设备可以包括发送器 13、 接收 器 14、 处理器 15及存储器 16, 其中,
发送器 13可用于向基站等网络设备发送上行信号, 特别的, 若 用户设备需与基站进行通信时, 发送器 13可发送上行通信数据至基 站。 接收器 14 可用于接收来自基站等网络设备的下行信号, 特别 的, 若用户设备需与基站进行通信时, 接收器 14可接收来自基站的 下行通信数据。
处理器 15为用户设备的控制以及处理中心,通过运行存储在存 储器 16 中的软件程序, 并调用及处理存储在存储器 16 中的数据, 从而控制用户设备进行收发信号, 以及实现用户设备的其他功能。
存储器 16可用于存储软件程序及数据, 以使得处理器 15可通 过运行存储在存储器 16 中的软件程序, 从而实现用户设备的收发信 号以及其他功能。
具体的, 所述处理器 15可用于经由第一安全密钥, 通过所述发 送器 13和所述接收器 14 与第一基站和第二基站进行数据传输, 以 及当所述用户设备与所述第一基站断开连接时, 通过所述发送器 13 和所述接收器 14维持与所述第二基站的数据传输, 并且可用于获取 指示信息, 用于指示所述处理器 15经由第二安全密钥, 通过所述发 送器 13和所述接收器 14 与所述第一基站进行数据传输, 所述第一 基站与所述第二基站为载波聚合; 所述存储器 16可用于存储第一安 全密钥的软件代码、 第二安全密钥的软件代码、 需传输的数据的软 件代码, 以及控制所述用户设备与所述第一基站和所述第二基站进 行交互的软件程序, 以使得所述处理器 15 可通过执行所述存储器 16 中存储的所述软件程序及调用相应的软件代码完成所述用户设备 与所述第一基站和所述第二基站之间的交互过程。
可选的, 所述处理器 15, 具体用于接收安全同步指示, 其中, 所述安全同步指示包括用于承载数据包的承载的 SN, 所述安全同步 指示用于指示从收发所述数据包开始, 所述处理器 15经由所述第二 安全密钥与所述第一基站进行数据传输。
可选的, 所述接收器 14, 还用于接收所述第一基站发送的 RRC 重建立消息, 所述 RRC重建立消息包括所述安全同步指示。
可选的,所述接收器 14接收的所述安全同步指示还包括承载的 HFN, 用于标识承载所述数据包的所述承载。 可选的, 所述接收器 1 4 , 具体用于接收所述第一基站或所述第 二基站发送的 PDCP的 PDU ,所述 PDU用于指示从收发所述 PDU开始 , 所述处理器 1 5 经由所述第二安全密钥与所述第一基站进行数据传 输。
可选的, 所述处理器 1 5 , 具体用于当所述第一基站发生无线链 路失败或切换时, 获取所述指示信息。
可选的, 所述处理器 1 5 , 还用于在所述接收器 1 4 接收到所述 RRC重建立消息后, 衍生所述第二安全密钥。
可选的, 当所述第一基站为宏基站, 所述第二基站为微基站时, 所述处理器 1 5 ,具体用于当所述用户设备与所述宏基站断开连接时, 基于所述微基站的 PUC CH维持与所述微基站的数据传输。
本发明的实施例提供一种用户设备, 该用户设备经由第一安全 密钥, 与第一基站和第二基站进行数据传输, 以及当用户设备与第 一基站断开连接时, 该用户设备维持与第二基站的数据传输, 第一 基站与第二基站为载波聚合, 并且该用户设备获取指示信息, 用于 指示该用户设备经由第二安全密钥, 与第一基站进行数据传输。 通 过该方案, 在用户设备经由第一安全密钥与第一基站和第二基站进 行数据传输时, 若用户设备与第一基站断开连接, 则用户设备可继 续维持与第二基站的数据传输, 并且当用户设备获取到指示信息后, 用户设备可根据指示信息, 经由第二安全密钥与第一基站进行数据 传输, 从而最大限度地保证了载波聚合场景下, 用户设备与基站之 间的数据传输的连续性。
如图 1 9所示, 本发明实施例提供一种基站, 对应于本发明实施 例提供的一种通信方法, 该基站可以包括发送器 24、 接收器 2 5、 处 理器 26及存储器 27 , 其中,
发送器 24可用于向用户设备发送下行信号, 特别的, 若用户设 备需与基站进行通信时, 发送器 24 可发送下行通信数据至用户设 备。
接收器 25可用于接收来自用户设备的上行信号, 特别的, 若用 户设备需与基站进行通信时, 接收器 25可接收来自用户设备的上行 通信数据。
处理器 26为基站的控制以及处理中心,通过运行存储在存储器 27 中的软件程序, 并调用及处理存储在存储器 27 中的数据, 从而 控制基站进行收发信号, 以及实现基站的其他功能。
存储器 27可用于存储软件程序及数据, 以使得处理器 26可通 过运行存储在存储器 2 7 中的软件程序, 从而实现基站的收发信号以 及其他功能。
具体的, 所述处理器 26可用于通过所述发送器 24和所述接收 器 25 经由第一安全密钥与用户设备和第二基站进行数据传输, 其 中, 所述基站与所述第二基站为载波聚合; 所述处理器 2 6可用于断 开与所述用户设备的连接, 其中, 所述用户设备与所述第二基站之 间维持数据传输; 所述发送器 24还可用于向所述用户设备发送指示 信息, 用于指示所述处理器 2 6经由第二安全密钥与所述基站进行数 据传输; 所述存储器 2 7可用于存储第一安全密钥的软件代码、 第二 安全密钥的软件代码、 需传输的数据的软件代码, 以及控制所述基 站与所述用户设备和所述第二基站进行交互的软件程序, 以使得所 述处理器 26 可通过执行所述存储器 27 中存储的所述软件程序及调 用相应的软件代码完成所述基站与所述用户设备和所述第二基站之 间的交互过程。
可选的, 所述指示信息包括安全同步指示, 所述安全同步指示 包括用于承载数据包的承载的 S N。 其中, 所述发送器 24 和所述接 收器 25 , 具体用于从收发所述数据包开始, 经由所述第二安全密钥 与所述用户设备进行数据传输。
可选的, 所述发送器 24 , 用于发送 RRC重建立消息至所述用户 设备, 所述 RRC重建立消息包括所述安全同步指示。
可选的, 所述安全同步指示还包括承载的 HFN , 用于标识承载 所述数据包的所述承载。
可选的, 所述指示信息包括 PDCP的 PDU。 其中, 所述发送器 24 和所述接收器 2 5 , 具体用于从收发所述 PDU开始, 经由所述第二安 全密钥与所述用户设备进行数据传输。
可选的, 所述处理器 2 6 , 具体用于当所述第一基站发生无线链 路失败或切换时, 断开与所述用户设备的连接。
可选的, 所述基站为宏基站, 所述第二基站为微基站。
本发明的实施例提供一种基站, 该基站经由第一安全密钥与用 户设备和第二基站进行数据传输, 其中, 该基站与第二基站为载波 聚合, 并且该基站断开与用户设备的连接, 其中, 用户设备与第二 基站之间维持数据传输, 以及该基站向用户设备发送指示信息, 用 于指示用户设备经由第二安全密钥与该基站进行数据传输。 通过该 方案, 在用户设备经由第一安全密钥与第一基站和第二基站进行数 据传输时, 若用户设备与第一基站断开连接, 则用户设备可继续维 持与第二基站的数据传输, 并且当用户设备获取到指示信息后, 用 户设备可根据指示信息, 经由第二安全密钥与第一基站进行数据传 输, 从而最大限度地保证了载波聚合场景下, 用户设备与基站之间 的数据传输的连续性。
如图 1 8所示, 本发明实施例提供一种用户设备, 对应于本发明 实施例提供的另一种通信方法 (第一基站发送至用户设备的下行数 据的通信方法), 该用户设备可以包括发送器 1 3、 接收器 1 4、 处理 器 1 5 及存储器 1 6 , 其中,
发送器 1 3可用于向基站等网络设备发送上行信号, 特别的, 若 用户设备需与基站进行通信时, 发送器 1 3可发送上行通信数据至基 站。
接收器 1 4 可用于接收来自基站等网络设备的下行信号, 特别 的, 若用户设备需与基站进行通信时, 接收器 1 4可接收来自基站的 下行通信数据。
处理器 1 5为用户设备的控制以及处理中心,通过运行存储在存 储器 1 6 中的软件程序, 并调用及处理存储在存储器 1 6 中的数据, 从而控制用户设备进行收发信号, 以及实现用户设备的其他功能。 存储器 16可用于存储软件程序及数据, 以使得处理器 15可通 过运行存储在存储器 16 中的软件程序, 从而实现用户设备的收发信 号以及其他功能。
具体的, 所述处理器 15可用于通过所述发送器 13和所述接收 器 14与第一基站及第二基站保持通讯, 所述第一基站与所述第二基 站为载波聚合; 所述发送器 13可用于当确定所述第一基站切换至目 标基站时, 向所述第二基站发送 RLC 状态报告, 用于所述第二基站 根据所述 RLC 状态报告, 经由所述第一基站向所述目标基站发送指 示信息, 以便所述目标基站根据所述指示信息确定向所述用户设备 的重传数据; 所述存储器 16可用于存储所述 RLC状态报告的软件代 码、 通讯数据的软件代码以及控制所述用户设备与所述第一基站和 所述第二基站进行交互的软件程序, 以使得所述处理器 15可根据所 述软件程序, 调用所述软件代码完成所述用户设备与所述第一基站 和所述第二基站之间的交互过程。
可选的, 所述处理器 15, 还用于在所述发送器 13 向所述第二 基站发送所述 RLC 状态报告时, 启动所述用户设备的定时器, 以及 若所述发送器 13发送完所述 RLC状态报告或所述用户设备的定时器 超时, 则释放所述第一基站的配置信息。
可选的, 所述发送器 13, 具体用于当所述用户设备与所述第一 基站之间发生无线链路失败时, 向所述第二基站发送所述 RLC 状态 报告。
或者, 当所述用户设备接收来自所述第一基站的 RLC状态上报 指示时, 向所述第二基站发送所述 RLC状态报告。
或者, 当所述用户设备接收来自所述第一基站的切换命令且接 收所述第二基站与所述用户设备保持连接的指示时, 向所述第二基 站发送所述 RLC状态 ^艮告。
本发明的实施例提供一种用户设备, 该用户设备与第一基站及 第二基站保持通讯, 第一基站与第二基站为载波聚合, 并且当确定 第一基站切换至目标基站时, 该用户设备向第二基站发送 RLC 状态 报告, 用于第二基站根据 RLC 状态报告, 经由第一基站向目标基站 发送指示信息, 以便目标基站根据指示信息确定向用户设备的重传 数据。 通过该方案, 当需从第一基站切换至目标基站时, 用户设备 可发送 RL C状态报告至第二基站, 以使第二基站再根据 RLC状态报 告, 经由第一基站向目标基站发送指示信息, 以便于目标基站可根 据指示信息确定向用户设备的重传数据, 从而最大限度地保证了载 波聚合场景下, 用户设备与基站之间的数据传输的连续性。
如图 2 0所示, 本发明实施例提供一种基站, 对应于本发明实施 例提供的另一种通信方法 (第一基站发送至用户设备的下行数据的 通信方法), 该基站可以包括发送器 3 3、 接收器 34、 处理器 35及存 储器 36 , 其中,
发送器 3 3可用于向用户设备发送下行信号, 特别的, 若用户设 备需与基站进行通信时, 发送器 3 3 可发送下行通信数据至用户设 备。
接收器 34可用于接收来自用户设备的上行信号, 特别的, 若用 户设备需与基站进行通信时, 接收器 34可接收来自用户设备的上行 通信数据。
处理器 35为基站的控制以及处理中心,通过运行存储在存储器 36 中的软件程序, 并调用及处理存储在存储器 36 中的数据, 从而 控制基站进行收发信号, 以及实现基站的其他功能。
存储器 36可用于存储软件程序及数据, 以使得处理器 35可通 过运行存储在存储器 36 中的软件程序, 从而实现基站的收发信号以 及其他功能。
具体的, 所述处理器 35可用于通过所述发送器 3 3和所述接收 器 34与用户设备及第一基站保持通讯, 所述第一基站与所述基站为 载波聚合; 所述接收器 34可用于接收来自所述用户设备的 RLC状态 报告, 所述 RLC状态报告为当确定所述第一基站切换至目标基站时, 所述用户设备发送的; 所述发送器 3 3可用于根据所述接收器 34接 收的所述 RLC 状态报告经由所述第一基站向所述目标基站发送指示 信息, 以便所述目标基站根据所述指示信息确定向所述用户设备的 重传数据;所述存储器 36可用于存储所述 RLC状态报告的软件代码、 通讯数据的软件代码以及控制所述基站与所述用户设备和所述第一 基站进行交互的软件程序, 以使得所述处理器 35可根据所述软件程 序, 调用所述软件代码完成所述基站与所述用户设备和所述第一基 站之间的交互过程。
可选的, 所述接收器 34, 具体用于当所述用户设备与所述第一 基站之间发生无线链路失败时, 接收来自所述用户设备的所述 RLC 状态报告。
或者, 当所述用户设备接收来自所述第一基站的 RLC状态上报 指示时, 接收来自所述用户设备的所述 RLC状态报告。
或者, 当所述用户设备接收来自所述第一基站的切换命令且接 收所述第二基站与所述用户设备保持连接的指示时, 接收来自所述 用户设备的所述 RLC状态报告。
可选的, 所述发送器 33发送的所述指示信息包括 PDCP SN。 其 中, 所述发送器 33, 具体用于根据所述接收器 34 接收的所述 RLC 状态报告经由所述第一基站向所述目标基站发送所述 PDCP SN。
本发明的实施例提供一种基站, 该基站与用户设备及第一基站 保持通讯, 第一基站与该基站为载波聚合, 并且该基站接收来自用 户设备的 RLC 状态报告, RLC 状态报告为当确定第一基站切换至目 标基站时, 用户设备发送的, 以及该基站根据接收的 RLC 状态报告 经由第一基站向目标基站发送指示信息, 以便目标基站根据指示信 息确定向用户设备的重传数据。 通过该方案, 当需从第一基站切换 至目标基站时, 用户设备可发送 RLC 状态报告至第二基站, 以使第 二基站再根据 RLC 状态报告, 经由第一基站向目标基站发送指示信 息, 以便于目标基站可根据指示信息确定向用户设备的重传数据, 从而最大限度地保证了载波聚合场景下, 用户设备与基站之间的数 据传输的连续性。
如图 21所示, 本发明的实施例提供一种通信系统, 对应于本发 明实施例提供的一种通信方法, 该通信系统可以包括第一基站、 第 二基站及用户设备。
如图 22所示, 本发明的实施例还提供另一种通信系统, 对应于 本发明实施例提供的另一种通信方法, 该通信系统可以包括第一基 站、 第二基站、 用户设备及目标基站。
所属领域的技术人员可以清楚地了解到,为描述的方便和简洁, 仅以上述各功能模块的划分进行举例说明, 实际应用中, 可以根据 需要而将上述功能分配由不同的功能模块完成, 即将装置的内部结 构划分成不同的功能模块, 以完成以上描述的全部或者部分功能。 上述描述的系统, 装置和单元的具体工作过程, 可以参考前述方法 实施例中的对应过程, 在此不再赘述。
在本申请所提供的几个实施例中, 应该理解到, 所揭露的系统, 装置和方法, 可以通过其它的方式实现。 例如, 以上所描述的装置 实施例仅仅是示意性的, 例如, 所述模块或单元的划分, 仅仅为一 种逻辑功能划分, 实际实现时可以有另外的划分方式, 例如多个单 元或组件可以结合或者可以集成到另一个系统, 或一些特征可以忽 略, 或不执行。 另一点, 所显示或讨论的相互之间的耦合或直接耦 合或通信连接可以是通过一些接口, 装置或单元的间接耦合或通信 连接, 可以是电性, 机械或其它的形式。
所述作为分离部件说明的单元可以是或者也可以不是物理上分 开的, 作为单元显示的部件可以是或者也可以不是物理单元, 即可 以位于一个地方, 或者也可以分布到多个网络单元上。 可以根据实 际的需要选择其中的部分或者全部单元来实现本实施例方案的目 的。
另外, 在本发明各个实施例中的各功能单元可以集成在一个处 理单元中, 也可以是各个单元单独物理存在, 也可以两个或两个以 上单元集成在一个单元中。 上述集成的单元既可以釆用硬件的形式 实现, 也可以釆用软件功能单元的形式实现。
所述集成的单元如果以软件功能单元的形式实现并作为独立的 产品销售或使用时, 可以存储在一个计算机可读取存储介质中。 基 于这样的理解, 本发明的技术方案本质上或者说对现有技术做出贡 献的部分或者该技术方案的全部或部分可以以软件产品的形式体现 出来, 该计算机软件产品存储在一个存储介质中, 包括若干指令用 以使得一台计算机设备 (可以是个人计算机, 服务器, 或者网络设 备等) 或处理器 ( processor ) 执行本发明各个实施例所述方法的全 部或部分步骤。 而前述的存储介质包括: U 盘、 移动硬盘、 只读存 储器( ROM, Read-Only Memory ),随机存取存储器( RAM, Random Access Memory )、 磁碟或者光盘等各种可以存储程序代码的介质。
以上所述, 仅为本发明的具体实施方式, 但本发明的保护范围 并不局限于此, 任何熟悉本技术领域的技术人员在本发明揭露的技 术范围内, 可轻易想到变化或替换, 都应涵盖在本发明的保护范围 之内。 因此, 本发明的保护范围应以所述权利要求的保护范围为准。

Claims

权 利 要 求 书
1、 一种通信方法, 其特征在于, 包括:
用户设备经由笫一安全密钥,与第一基站和第二基站进行数据传 输, 所述第一基站与所述第二基站为载波聚合;
当所述用户设备与所述第一基站断开连接时,所述用户设备维持 与所述第二基站的数据传输;
所述用户设备获取指示信息,用于指示所述用户设备经由第二安 全密钥, 与所述第一基站进行数据传输。
2、 如权利要求 1 所述的方法, 其特征在于, 所述用户设备获取 指示信息, 具体包括:
所述用户设备接收安全同步指示;
其中, 所述安全同步指示包括用于承载数据包的承载的序列号 S N , 所述安全同步指示用于指示从收发所述数据包开始, 所述用户设 备经由所述第二安全密钥与所述第一基站进行数据传输。
3、 如权利要求 2所述的方法, 其特征在于, 所述用户设备接收 安全同步指示, 具体包括:
所述用户设备接收所述第一基站发送的无线资源控制 RR C 重建 立消息, 所述 RRC重建立消息包括所述安全同步指示。
4、 如权利要求 2或 3所述的方法, 其特征在于:
所述安全同步指示还包括承载的超帧号 H F N , 用于标识承载所述 数据包的所述承载。
5、 如权利要求 1 所述的方法, 其特征在于, 所述用户设备获取 指示信息, 具体包括:
所述用户设备接收所述第一基站或所述第二基站发送的分组数 据汇聚协议 P DC P 的协议数据单元 P DU , 所述 P DU用于指示从收发所 述 P DU开始, 所述用户设备经由所述第二安全密钥与所述第一基站进 行数据传输。
6、 如权利要求 1 至 5任一项所述的方法, 其特征在于, 所述用 户设备获取指示信息, 具体包括: 当所述第一基站发生无线链路失败 或切换时, 所述用户设备获取所述指示信息。
7、 如权利要求 3至 6任一项所述的方法, 其特征在于, 还包括: 所述用户设备收到所述 RR C重建立消息后,衍生所述第二安全密 钥。
8、 如权利要求 1至 7任一项所述的方法, 其特征在于:
所述第一基站为宏基站, 所述第二基站为微基站。
9、 如权利要求 8所述的方法, 其特征在于, 所述当所述用户设 备与所述第一基站断开连接时, 所述用户设备维持与所述第二基站的 数据传输, 具体包括:
所述微基站具有物理上行控制信道 P UC C H , 当所述用户设备与所 述宏基站断开连接时, 所述用户设备基于所述 P U C C H维持与所述微基 站的数据传输。
1 0、 一种通信方法, 其特征在于, 包括:
第一基站经由第一安全密钥与用户设备和第二基站进行数据传 输, 所述第一基站与所述第二基站为载波聚合;
所述第一基站断开与所述用户设备的连接, 其中, 所述用户设备 与所述第二基站之间维持数据传输;
所述第一基站向所述用户设备发送指示信息,用于指示所述用户 设备经由第二安全密钥与所述第一基站进行数据传输。
1 1、 如权利要求 1 0所述的方法, 其特征在于:
所述指示信息包括安全同步指示,所述安全同步指示包括用于承 载数据包的承载的序列号 S N ;
其中,所述第一基站经由第二安全密钥与所述用户设备进行数据 传输, 具体包括:
从收发所述数据包开始,所述第一基站经由所述第二安全密钥与 所述用户设备进行数据传输。
1 2、 如权利要求 1 1 所述的方法, 其特征在于, 所述从收发所述 数据包开始, 所述第一基站经由所述第二安全密钥与所述用户设备进 行数据传输之前, 所述方法还包括: 所述第一基站发送无线资源控制 RRC 重建立消息至所述用户设 备, 所述 RRC重建立消息包括所述安全同步指示。
13、 如权利要求 11或 12所述的方法, 其特征在于,
所述安全同步指示还包括承载的超帧号 HFN, 用于标识承载所述 数据包的所述承载。
14、 如权利要求 10所述的方法, 其特征在于:
所述指示信息包括分组数据汇聚协议 PDCP的协议数据单元 PDU; 其中,所述第一基站经由第二安全密钥与所述用户设备进行数据 传输, 具体包括:
从收发所述 PDU开始,所述第一基站经由所述第二安全密钥与所 述用户设备进行数据传输。
15、 如权利要求 10-14任一项所述的方法, 其特征在于, 所述第 一基站断开与所述用户设备的连接, 具体包括:
当所述第一基站发生无线链路失败或切换时,所述第一基站断开 与所述用户设备的连接。
16、 如权利要求 10-15任一项所述的方法, 其特征在于: 所述第一基站为宏基站, 所述第二基站为微基站。
17、 一种通信方法, 其特征在于, 包括:
用户设备与第一基站及第二基站保持通讯,所述第一基站与所述 第二基站为载波聚合;
当确定所述第一基站切换至目标基站时,所述用户设备向所述第 二基站发送无线链路控制 RLC状态报告, 用于所述第二基站根据所述 RLC状态报告, 经由所述第一基站向所述目标基站发送指示信息, 以 便所述目标基站根据所述指示信息确定向所述用户设备的重传数据。
18、 如权利要求 17所述的方法, 其特征在于, 所述方法还包括: 所述用户设备向所述第二基站发送所述 RLC状态报告时,所述用 户设备启动所述用户设备的定时器;
若所述用户设备发送完所述 RLC 状态报告或所述用户设备的定 时器超时, 所述用户设备释放所述第一基站的配置信息。
19、 如权利要求 17或 18所述的方法, 其特征在于, 所述当确定 第一基站切换至目标基站时, 所述用户设备向所述第二基站发送 RLC 状态报告, 具体包括:
当所述用户设备与所述第一基站之间发生无线链路失败时,所述 用户设备向所述第二基站发送所述 RLC状态报告;
或者,
当所述用户设备接收来自所述第一基站的 RLC状态上报指示时, 所述用户设备向所述第二基站发送所述 RLC状态报告;
或者,
当所述用户设备接收来自所述第一基站的切换命令且所述第二 基站与所述用户设备保持连接的指示时, 所述用户设备向所述第二基 站发送所述 RLC状态 告。
20、 如权利要求 17-19任一项所述的方法, 其特征在于: 所述第一基站为宏基站, 所述第二基站为微基站。
21、 一种通信方法, 其特征在于, 包括:
第二基站与用户设备及第一基站保持通讯,所述第一基站与所述 第二基站为载波聚合;
所述第二基站接收所述用户设备发送的无线链路控制 RLC 状态 报告, 所述 RLC状态报告为当确定所述第一基站切换至目标基站时, 所述用户设备发送的;
所述第二基站根据所述 RLC 状态报告经由所述第一基站向所述 目标基站发送指示信息, 以便所述目标基站根据所述指示信息确定向 所述用户设备的重传数据。
22、 如权利要求 21 所述的方法, 其特征在于, 所述第二基站接 收来自所述用户设备的 RLC状态报告, 具体包括:
当所述用户设备与所述第一基站之间发生无线链路失败时,所述 第二基站接收来自所述用户设备的所述 RLC状态报告;
或者,
当所述用户设备接收来自所述第一基站的 RLC状态上报指示时, 所述第二基站接收来自所述用户设备的所述 RLC状态报告; 或者,
当所述用户设备接收来自所述第一基站的切换命令且所述第二 基站与所述用户设备保持连接的指示时, 所述第二基站接收来自所述 用户设备的所述 RLC状态报告。
2 3、 如权利要求 2 1或 22所述的方法, 其特征在于, 所述指示信 息包括分组数据汇聚协议序列号 PDCP SN ;
其中,所述第二基站根据所述 RLC状态报告经由所述第一基站向 所述目标基站发送指示信息, 具体包括:
所述第二基站根据所述 RLC 状态报告经由所述第一基站向所述 目标基站发送所述 PDCP SN。
24、 如权利要求 2 1 -2 3任一项所述的方法, 其特征在于: 所述第一基站为宏基站, 所述第二基站为微基站。
25、 一种用户设备, 其特征在于, 包括:
处理单元, 用于经由第一安全密钥, 与第一基站和第二基站进行 数据传输, 以及当所述用户设备与所述笫一基站断开连接时, 维持与 所述第二基站的数据传输, 所述第一基站与所述第二基站为载波聚 合;
获取单元, 用于获取指示信息, 用于指示所述处理单元经由第二 安全密钥, 与所述第一基站进行数据传输。
26、 如权利要求 25所述的用户设备, 其特征在于,
所述获取单元, 具体用于接收安全同步指示;
其中, 所述安全同步指示包括用于承载数据包的承载的序列号 SN , 所述安全同步指示用于指示从收发所述数据包开始, 所述处理单 元经由所述第二安全密钥与所述第一基站进行数据传输。
27、 如权利要求 26所述的用户设备, 其特征在于,
所述获取单元, 还用于接收所述第一基站发送的无线资源控制 RRC重建立消息, 所述 RRC重建立消息包括所述安全同步指示。
28、 如权利要求 26或 27所述的用户设备, 其特征在于, 所述获取单元接收的所述安全同步指示还包括承载的超帧号
HFN , 用于标识承载所述数据包的所述承载。
29、 如权利要求 25所述的用户设备, 其特征在于,
所述获取单元,具体用于接收所述第一基站或所述第二基站发送 的分组数据汇聚协议 PDCP 的协议数据单元 PDU , 所述 PDU用于指示 从收发所述 PDU开始, 所述处理单元经由所述第二安全密钥与所述第 一基站进行数据传输。
30、 如权利要求 25所述的用户设备, 其特征在于,
所述获取单元,具体用于当所述第一基站发生无线链路失败或切 换时, 获取所述指示信息。
31、 如权利要求 27 - 30任一项所述的用户设备, 其特征在于, 所述处理单元,还用于在所述获取单元接收到所述 RRC重建立消 息后, 衍生所述第二安全密钥。
32、 如权利要求 31 所述的用户设备, 其特征在于, 当所述第一 基站为宏基站, 所述第二基站为微基站时:
所述处理单元,具体用于当所述用户设备与所述宏基站断开连接 时, 基于所述微基站的物理上行控制信道 PUCCH维持与所述微基站的 数据传输。
3 3、 一种基站, 其特征在于, 包括:
传输单元,用于经由第一安全密钥与用户设备和第二基站进行数 据传输, 其中, 所述基站与所述第二基站为载波聚合;
处理单元, 用于断开与所述用户设备的连接, 其中, 所述用户设 备与所述第二基站之间维持数据传输;
发送单元, 用于向所述用户设备发送指示信息, 用于指示所述传 输单元经由第二安全密钥与所述基站进行数据传输。
34、 如权利要求 33所述的基站, 其特征在于, 所述指示信息包 括安全同步指示, 所述安全同步指示包括用于承载数据包的承载的序 歹' J号 SN ;
其中, 所述传输单元, 具体用于从收发所述数据包开始, 经由所 述第二安全密钥与所述用户设备进行数据传输。
35、 如权利要求 34所述的基站, 其特征在于,
所述发送单元,用于发送无线资源控制 RRC重建立消息至所述用 户设备, 所述 RRC重建立消息包括所述安全同步指示。
36、 如权利要求 34或 35所述的基站, 其特征在于,
所述安全同步指示还包括承载的超帧号 HFN , 用于标识承载所述 数据包的所述承载。
37、 如权利要求 33所述的基站, 其特征在于, 所述指示信息包 括分组数据汇聚协议 PDCP的协议数据单元 PDU ;
其中, 所述传输单元, 具体用于从收发所述 PDU开始, 经由所述 第二安全密钥与所述用户设备进行数据传输。
38、 如权利要求 3 3- 37任一项所述的基站, 其特征在于, 所述处理单元,具体用于当所述第一基站发生无线链路失败或切 换时, 断开与所述用户设备的连接。
39、 如权利要求 3 3- 38任一项所述的基站, 其特征在于, 所述基站为宏基站, 所述第二基站为微基站。
4 0、 一种用户设备, 其特征在于, 包括:
处理单元, 用于与第一基站及第二基站保持通讯, 所述第一基站 与所述第二基站为载波聚合;
发送单元, 用于当确定所述第一基站切换至目标基站时, 向所述 第二基站发送无线链路控制 RLC状态报告, 用于所述第二基站根据所 述 RLC状态报告, 经由所述第一基站向所述目标基站发送指示信息, 以便所述目标基站根据所述指示信息确定向所述用户设备的重传数 据。
4 1、 如权利要求 4 0所述的用户设备, 其特征在于,
所述处理单元,还用于在所述发送单元向所述第二基站发送所述 RLC状态报告时, 启动所述用户设备的定时器, 以及若所述发送单元 发送完所述 RLC状态报告或所述用户设备的定时器超时, 则释放所述 第一基站的配置信息。
42、 如权利要求 40或 41所述的用户设备, 其特征在于, 所述发送单元,具体用于当所述用户设备与所述第一基站之间发 生无线链路失败时, 向所述第二基站发送所述 RLC状态报告;
或者,
当所述用户设备接收来自所述第一基站的 RLC状态上报指示时, 向所述第二基站发送所述 RLC状态报告;
或者,
当所述用户设备接收来自所述第一基站的切换命令且接收所述 第二基站与所述用户设备保持连接的指示时, 向所述第二基站发送所 述 RLC状态报告。
43、 一种基站, 其特征在于, 包括:
处理单元, 用于与用户设备及第一基站保持通讯, 所述第一基站 与所述基站为载波聚合;
接收单元,用于接收来自所述用户设备的无线链路控制 RLC状态 报告, 所述 RLC状态报告为当确定所述第一基站切换至目标基站时, 所述用户设备发送的;
发送单元,用于根据所述接收单元接收的所述 RLC状态报告经由 所述第一基站向所述目标基站发送指示信息, 以便所述目标基站根据 所述指示信息确定向所述用户设备的重传数据。
44、 如权利要求 43所述的基站, 其特征在于,
所述接收单元,具体用于当所述用户设备与所述第一基站之间发 生无线链路失败时, 接收来自所述用户设备的所述 RLC状态报告; 或者,
当所述用户设备接收来自所述第一基站的 RLC状态上报指示时, 接收来自所述用户设备的所述 RLC状态报告;
或者,
当所述用户设备接收来自所述第一基站的切换命令且接收所述 第二基站与所述用户设备保持连接的指示时, 接收来自所述用户设备 的所述 RLC状态 ^艮告。
45、 如权利要求 4 3或 44所述的基站, 其特征在于, 所述发送单 元发送的所述指示信息包括分组数据汇聚协议序列号 PDCP SN ;
其中, 所述发送单元, 具体用于根据所述接收单元接收的所述 RLC状态 告经由所述第一基站向所述目标基站发送所述 PDCP SN。
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