WO2019061151A1 - 切换路径的方法和终端设备 - Google Patents

切换路径的方法和终端设备 Download PDF

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Publication number
WO2019061151A1
WO2019061151A1 PCT/CN2017/103997 CN2017103997W WO2019061151A1 WO 2019061151 A1 WO2019061151 A1 WO 2019061151A1 CN 2017103997 W CN2017103997 W CN 2017103997W WO 2019061151 A1 WO2019061151 A1 WO 2019061151A1
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WIPO (PCT)
Prior art keywords
cell group
terminal device
data
uplink data
pdcp layer
Prior art date
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Ceased
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PCT/CN2017/103997
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English (en)
French (fr)
Inventor
唐海
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Guangdong Oppo Mobile Telecommunications Corp Ltd
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Guangdong Oppo Mobile Telecommunications Corp Ltd
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 Guangdong Oppo Mobile Telecommunications Corp Ltd filed Critical Guangdong Oppo Mobile Telecommunications Corp Ltd
Priority to CN201780050389.2A priority Critical patent/CN109845367B/zh
Priority to EP17927596.1A priority patent/EP3687239B1/en
Priority to JP2020516863A priority patent/JP2021503194A/ja
Priority to US16/645,984 priority patent/US11071016B2/en
Priority to KR1020207011066A priority patent/KR20200054293A/ko
Priority to AU2017433843A priority patent/AU2017433843B2/en
Priority to PCT/CN2017/103997 priority patent/WO2019061151A1/zh
Publication of WO2019061151A1 publication Critical patent/WO2019061151A1/zh
Anticipated expiration legal-status Critical
Ceased legal-status Critical Current

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    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04W—WIRELESS COMMUNICATION NETWORKS
    • H04W76/00—Connection management
    • H04W76/20—Manipulation of established connections
    • H04W76/22—Manipulation of transport tunnels
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04W—WIRELESS COMMUNICATION NETWORKS
    • H04W28/00—Network traffic management; Network resource management
    • H04W28/02—Traffic management, e.g. flow control or congestion control
    • H04W28/0252—Traffic management, e.g. flow control or congestion control per individual bearer or channel
    • H04W28/0263—Traffic management, e.g. flow control or congestion control per individual bearer or channel involving mapping traffic to individual bearers or channels, e.g. traffic flow template [TFT]
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04W—WIRELESS COMMUNICATION NETWORKS
    • H04W28/00—Network traffic management; Network resource management
    • H04W28/02—Traffic management, e.g. flow control or congestion control
    • H04W28/04—Error control
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04W—WIRELESS COMMUNICATION NETWORKS
    • H04W36/00—Hand-off or reselection arrangements
    • H04W36/0005—Control or signalling for completing the hand-off
    • H04W36/0055—Transmission or use of information for re-establishing the radio link
    • H04W36/0069—Transmission or use of information for re-establishing the radio link in case of dual connectivity, e.g. decoupled uplink/downlink
    • H04W36/00692—Transmission or use of information for re-establishing the radio link in case of dual connectivity, e.g. decoupled uplink/downlink using simultaneous multiple data streams, e.g. cooperative multipoint [CoMP], carrier aggregation [CA] or multiple input multiple output [MIMO]
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04W—WIRELESS COMMUNICATION NETWORKS
    • H04W36/00—Hand-off or reselection arrangements
    • H04W36/02—Buffering or recovering information during reselection ; Modification of the traffic flow during hand-off
    • H04W36/026—Multicasting of data during hand-off
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04W—WIRELESS COMMUNICATION NETWORKS
    • H04W72/00—Local resource management
    • H04W72/04—Wireless resource allocation
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04W—WIRELESS COMMUNICATION NETWORKS
    • H04W76/00—Connection management
    • H04W76/10—Connection setup
    • H04W76/15—Setup of multiple wireless link connections
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04W—WIRELESS COMMUNICATION NETWORKS
    • H04W76/00—Connection management
    • H04W76/10—Connection setup
    • H04W76/15—Setup of multiple wireless link connections
    • H04W76/16—Involving different core network technologies, e.g. a packet-switched [PS] bearer in combination with a circuit-switched [CS] bearer
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04W—WIRELESS COMMUNICATION NETWORKS
    • H04W80/00—Wireless network protocols or protocol adaptations to wireless operation
    • H04W80/02—Data link layer protocols

Definitions

  • Embodiments of the present invention relate to the field of communications, and more particularly, to a method and a terminal device for switching paths.
  • the upper layer data arrives at the Packet Data Convergence Protocol (PDCP) layer, and the primary cell group (MCG) or the secondary cell group (Secondary CG,
  • PDCP Packet Data Convergence Protocol
  • MCG primary cell group
  • Secondary CG secondary cell group
  • UE User Equipment
  • RLC Radio Link Control
  • the UE sends the data from the PDCP to the RLC, generates the RLC PDU, and further generates the MAC PDU, which is too high for the instantaneous processing capability of the UE.
  • a pre-processing scheme is provided in New Radio (NR). Specifically, the UE is allowed to send data from the PDCP to the RLC before the uplink resource grant reaches the UE, generate an RLC PDU, and generate a MAC PDU after the uplink resource grant is reached, thereby alleviating the instantaneous processing capability requirement for the UE.
  • NR New Radio
  • this pre-processing scheme also has a certain negative effect. For example, if the user is initially on the MCG and has done a certain amount of data preprocessing, the data is sent from the PDCP to the MCG RLC, and then the part of the preprocessed data is not "switched" when the user switches to the SCG. The performance that causes the switch to drop.
  • a method and a terminal device for switching paths are provided, which can effectively improve handover performance.
  • a first aspect provides a method for switching a path, where the method is applied to a terminal device, where the terminal device has a packet data convergence protocol PDCP layer, and the PDCP layer can send an uplink to a first cell group or a second cell group. Data, the first cell group and the second cell group are different cell groups, and the PDCP layer currently sends uplink data to the first cell group;
  • the method includes:
  • the terminal device switches the PDCP layer by sending uplink data to the first cell group to send uplink data to the second cell group; the terminal device sends first uplink data to the second cell group,
  • the first uplink data includes at least first data, where the first data refers to data that the terminal device has sent to the radio link control protocol RLC layer of the first cell group.
  • the packet is sent to the second cell group and sent to the second cell group.
  • the data of the RLC layer of the first cell group re-switches the data that is not "switched", which can effectively improve the handover performance.
  • the first data includes data that the terminal device has sent to the RLC layer of the first cell group and does not receive correct reception feedback.
  • the first data includes data that the terminal device has sent to an RLC layer of the first cell group and is not completely mapped to a medium access control MAC protocol data unit PDU.
  • the method before the sending, by the terminal device, the first uplink data to the second cell group, the method further includes:
  • the PDCP layer of the terminal device sends the first indication information to the RLC layer of the first cell group, where the first indication information is used to indicate that the RLC layer of the first cell group clears the first data.
  • the technical solution of the embodiment of the present invention can further improve the performance of the terminal device.
  • the method before the terminal device switches the PDCP layer to send the uplink data to the first cell group to send the uplink data to the second cell group, the method further includes:
  • the terminal device receives the second indication information that is sent by the network device, where the second indication information is used to indicate that the terminal device switches the PDCP layer by sending uplink data to the first cell group to the second
  • the cell group sends uplink data, where the terminal device switches the PDCP layer by sending uplink data to the first cell group to send uplink data to the second cell group, including:
  • the terminal device switches the PDCP layer by transmitting uplink data to the first cell group to transmitting uplink data to the second cell group according to the second indication information.
  • the first uplink data further includes: the terminal device The PDCP layer does not transmit data to the first cell group in the buffer of the PDCP layer before the uplink data is transmitted to the first cell group and before the uplink data is sent to the second cell group.
  • the first uplink data further includes: the terminal device, after the PDCP layer sends uplink data to the first cell group, after transmitting uplink data to the second cell group, The data received by the PDCP layer.
  • a terminal device where the terminal device has a packet data convergence protocol PDCP layer, and the PDCP layer can send uplink data to a first cell group or a second cell group, where the first cell group and the The second cell group is a different cell group, and the PDCP layer currently sends uplink data to the first cell group;
  • PDCP layer can send uplink data to a first cell group or a second cell group, where the first cell group and the The second cell group is a different cell group, and the PDCP layer currently sends uplink data to the first cell group;
  • the terminal device includes:
  • a processing unit configured to switch, by the PDCP layer, uplink data to the first cell group to send uplink data to the second cell group;
  • a transceiver unit configured to send first uplink data to the second cell group, where the first uplink data includes at least first data, where the first data indicates that the terminal device has sent to the first cell group Radio Link Control Protocol RLC layer data.
  • a terminal device where the terminal device has a packet data convergence protocol PDCP layer, and the PDCP layer can send uplink data to a first cell group or a second cell group, where the first cell group and the The second cell group is a different cell group, and the PDCP layer currently sends uplink data to the first cell group;
  • PDCP layer can send uplink data to a first cell group or a second cell group, where the first cell group and the The second cell group is a different cell group, and the PDCP layer currently sends uplink data to the first cell group;
  • the terminal device includes:
  • a processor configured to switch, by the PDCP layer, uplink data to the first cell group to send uplink data to the second cell group;
  • a transceiver configured to send first uplink data to the second cell group, where the first uplink data includes at least first data, where the first data is that the terminal device has sent to the first cell group Radio Link Control Protocol RLC layer data.
  • terminal devices of the second aspect and the third aspect of the embodiments of the present invention are capable of performing the method embodiments in the foregoing first aspect and various implementation manners.
  • a computer readable medium for storing a computer program, the computer program comprising instructions for performing the method embodiments of the first aspect and various implementations described above.
  • a fifth aspect provides a computer chip, including: an input interface, an output interface, at least one processor, and a memory, wherein the processor is configured to execute code in the memory when the generation When the code is executed, the processor may implement various processes performed by the terminal device in the method of switching paths in the first aspect and various implementations described above.
  • a communication system including the terminal device described above.
  • FIG. 1 is a schematic diagram of a protocol architecture for replicating data under dual connectivity according to an embodiment of the present invention.
  • FIG. 2 is a schematic diagram of another protocol architecture for replicating data under dual connectivity according to an embodiment of the present invention.
  • FIG. 3 is a schematic flowchart of a method for switching a path according to an embodiment of the present invention.
  • FIG. 4 is a schematic block diagram of a terminal device according to an embodiment of the present invention.
  • FIG. 5 is a schematic block diagram of another terminal device according to an embodiment of the present invention.
  • GSM Global System of Mobile communication
  • CDMA Code Division Multiple Access
  • WCDMA Wideband Code Division Multiple Access
  • GPRS General Packet Radio Service
  • LTE Long Term Evolution
  • TDD Time Division Duplex
  • UMTS Universal Mobile Telecommunication System
  • the present invention describes various embodiments in connection with network devices and terminal devices.
  • the network device may refer to any entity on the network side that is used to send or receive signals.
  • it may be a device communication of a machine type communication (MTC), a base station (BTS) in GSM or CDMA, a base station (NodeB) in WCDMA, an evolved base station (Evolutional Node B, eNB or eNodeB in LTE). ), base station equipment in a 5G network, and the like.
  • MTC machine type communication
  • BTS base station
  • NodeB base station
  • Evolutional Node B eNB or eNodeB in LTE
  • 5G network and the like.
  • the terminal device can be any terminal device. Specifically, the terminal device can communicate with one or more core networks (Core Network) via a Radio Access Network (RAN), and can also be referred to as an access terminal, a user equipment (User Equipment, UE), and a user. Unit, subscriber station, mobile station, mobile station, remote station, remote terminal, mobile device, user terminal, terminal, wireless communication device, user agent or user device.
  • Core Network Core Network
  • RAN Radio Access Network
  • UE User Equipment
  • it can be a cellular phone, a cordless phone, a Session Initiation Protocol (SIP) phone, a Wireless Local Loop (WLL) station, a Personal Digital Assistant (PDA), A handheld device having a wireless communication function, a computing device, or other processing device connected to a wireless modem, an in-vehicle device, a wearable device, and a terminal device in a 5G network.
  • SIP Session Initiation Protocol
  • WLL Wireless Local Loop
  • PDA Personal Digital Assistant
  • multiple network nodes can serve terminal devices, and copy data can be transmitted between the cell group and the terminal devices.
  • the CG may be equivalent to a network node or a network device or the like.
  • the protocol architecture of the duplicate data transmission mode may be as shown in FIG. 1 and FIG. 2.
  • the replication data transmission mode in the DC scenario adopts a protocol structure of a split bearer.
  • the Packet Data Convergence Protocol (PDCP) is located in a certain CG (Master CG (MCG) or Secondary CG (SCG)), which is the "anchor" CG. (anchor CG).
  • MCG Master CG
  • SCG Secondary CG
  • the PDCP copies the PDCP Protocol Data Unit (PDU) into the same two copies, such as one PDCP PDU and one Duplicated PDCP PDU.
  • the two PDCP PDUs are controlled by different CG radio links (Radio Link).
  • PDCP layer monitors two PDCP is the same copy version, that is, one of them is discarded, and the other is submitted to the upper layer.
  • the two bearers respectively connected to the RLC and the MAC under the PDCP are called a split bearer, and if the PDCP is located at the MCG, it is an MCG Split Bearer, and if the PDCP is located at the SCG, it is an SCG split. Bearer.
  • two PDCP PDUs are transmitted through different CGs, which can achieve the purpose of frequency diversity gain, thereby improving the reliability of data transmission.
  • each sub-layer is sent to a specified layer of the receiving end according to different data of the protocol data unit.
  • the data that is not processed into each sub-layer is called a service data unit (SDU), and the data that is formed into a specific format after being processed by the sub-layer is called a protocol data unit (PDU).
  • SDU service data unit
  • PDU protocol data unit
  • the SDU is an information element transmitted from a higher layer protocol to a lower layer protocol, that is, the original data of the SDU is a PDU of the upper layer of the protocol.
  • the PDU formed by this layer is the SDU of the next layer.
  • each logical channel of each terminal device has an RLC entity (RLC entity) received by the RLC entity from the PDCP layer.
  • RLC entity RLC entity
  • Data, or data destined for the PDCP layer may be referred to as an RLC SDU (or PDCP PDU).
  • the data received by the RLC entity from the MAC layer, or the data sent to the MAC layer may be referred to as an RLC PDU (or MAC SDU).
  • the RLC layer is located between the PDCP layer and the MAC layer, and the RLC layer can communicate with the PDCP layer through a Service Access Point (SAP), and performs the logical channel and the MAC layer. Communication.
  • SAP Service Access Point
  • the terminal device can preprocess the data. Specifically, the terminal device may send data from the PDCP layer to the RLC layer to generate an RLC PDU before the uplink resource authorization reaches the terminal device, and generate a MAC PDU after the uplink resource authorization is reached.
  • the terminal device may cause the handover performance to be too low.
  • the PDCP layer of the terminal device initially sends uplink data to the MCG and performs a certain amount of data preprocessing
  • the data is sent from the PDCP to the MCG RLC, and then the partial preprocessing is performed when the terminal device switches to the SCG.
  • the data is not "switched" and the performance of the switch is degraded.
  • a method for switching a path is proposed, which can effectively improve the path switching performance of the terminal device.
  • the method for path switching in the embodiment of the present invention is described below for the scenario of the uplink.
  • FIG. 3 is a schematic flowchart of a method for a terminal device to switch a path according to an embodiment of the present invention.
  • the method includes:
  • the terminal device switches the PDCP layer of the terminal device by sending uplink data to the first cell group to transmitting uplink data to the second cell group.
  • the terminal device sends first uplink data to the second cell group, where the first uplink data includes at least first data, where the first data is a radio link control protocol that the terminal device has sent to the first cell group.
  • the data of the RLC layer is a radio link control protocol that the terminal device has sent to the first cell group.
  • first cell group and second cell group are employed in embodiments of the invention, but such cell groups should not be limited to these terms. These terms are only used to distinguish cell groups from each other.
  • the terminal device has a packet data convergence protocol PDCP layer, and the PDCP layer may send uplink data to the first cell group or the second cell group, where the first cell group and the second cell group are For different cell groups, the current PDCP layer sends uplink data to the first cell group. That is, the PDCP layer of the current terminal device sends uplink data to the first cell group.
  • PDCP layer may send uplink data to the first cell group or the second cell group, where the first cell group and the second cell group are For different cell groups.
  • the current PDCP layer sends uplink data to the first cell group. That is, the PDCP layer of the current terminal device sends uplink data to the first cell group.
  • the terminal device switches the PDCP layer by sending uplink data to the first cell group to send uplink data to the second cell group; the terminal device sends the first data to the second cell group.
  • Upstream data, the first uplink data includes at least first data, where the first data is data that the terminal device has sent to the RLC layer of the first cell group.
  • the PDCP layer of the terminal device switches from transmitting uplink data to the first cell group to transmitting uplink data to the second cell group, sending the packet to the second cell group has been sent to the first
  • the data of the RLC layer of the cell group re-switches the data that is not "switched" in this part, and can effectively improve the handover performance.
  • the first data in the embodiment of the present invention includes: data that has been sent to the first cell group that needs to be switched in order to improve the handover performance of the terminal device. That is, the function of transmitting the first data to the second cell group is to improve the handover performance of the terminal device.
  • the specific content of the first data is not limited in the embodiment of the present invention.
  • the first data may include data that the terminal device has sent to the RLC layer of the first cell group and has not received correct reception feedback.
  • the first data includes data that the terminal device has sent to the RLC layer of the first cell group and is not fully mapped to a Media Access Control (MAC) PDU.
  • MAC Media Access Control
  • first uplink data in the embodiment of the present invention may include, but is not limited to, the first data.
  • the first uplink data may further include: the terminal device switches the PDCP layer from sending the uplink data to the first cell group to before sending the uplink data to the second cell group, and the buffer of the PDCP layer is not sent to the cache.
  • the data of the first cell group may further include: the terminal device switches the PDCP layer from sending the uplink data to the first cell group to before sending the uplink data to the second cell group, and the buffer of the PDCP layer is not sent to the cache. The data of the first cell group.
  • the first uplink data may further include: the terminal device switching the PDCP layer by sending the uplink data to the first cell group to the data received by the PDCP layer after transmitting the uplink data to the second cell group.
  • the terminal device sends the first uplink data to the second cell group after the path switch is completed, where the first uplink data includes at least the first data.
  • the RLC layer of the first cell group may clear the first data.
  • the terminal device may send the first indication information to the RLC layer of the first cell group, where the first indication information is used to indicate the RLC layer of the first cell group, before sending the first uplink data to the second cell group. Clear the first data. The first data is cleared after the RLC layer of the first cell group receives the first indication information.
  • the terminal device switches the PDCP layer to send uplink data to the first cell group to send uplink data to the second cell group, and may be configured by a network device, or may be pre-configured.
  • the embodiment is not specifically limited.
  • the terminal device may receive second indication information that is sent by the network device, where the second indication information is used to indicate that the terminal device switches the PDCP layer by sending uplink data to the first cell group to the first The second cell group sends the uplink data. Then, the terminal device switches the PDCP layer by sending uplink data to the first cell group to send uplink data to the second cell group according to the second indication information.
  • the second indication information may be carried in Radio Resource Control (RRC) signaling. That is, the terminal device may determine, according to the second indication information in the RRC signaling, whether the terminal device switches the PDCP layer by sending uplink data to the first cell group to transmitting uplink data to the second cell group.
  • RRC Radio Resource Control
  • the embodiment of the present invention aims to improve the handover performance of the terminal device by transmitting the first data that has been sent to the first cell group that needs to be switched to the second cell group.
  • the embodiment of the present invention does not specifically limit the specific content of the first data and the manner in which the path is switched.
  • FIG. 4 is a schematic block diagram of a terminal device 200 according to an embodiment of the present invention. It should be understood that the terminal device 200 has a packet data convergence protocol PDCP layer, and the PDCP layer may send uplink data to the first cell group or the second cell group, where the first cell group and the second cell group are different cell groups. The PDCP layer currently sends uplink data to the first cell group.
  • PDCP layer may send uplink data to the first cell group or the second cell group, where the first cell group and the second cell group are different cell groups.
  • the PDCP layer currently sends uplink data to the first cell group.
  • the terminal device 200 includes:
  • the processing unit 210 is configured to switch the PDCP layer by sending uplink data to the first cell group to send uplink data to the second cell group.
  • the transceiver unit 220 is configured to send first uplink data to the second cell group, where the first uplink data includes at least first data, where the first data is a radio link control that the terminal device has sent to the first cell group. Protocol RLC layer data.
  • the first data includes an RLC that the terminal device has sent to the first cell group. Layers did not receive data that received feedback correctly.
  • the first data includes data that the terminal device has sent to the RLC layer of the first cell group and is not completely mapped to the medium access control MAC protocol data unit PDU.
  • the transceiver unit 220 is further configured to:
  • the transceiver unit 220 is further configured to:
  • the processing unit 210 is specifically configured to:
  • the first uplink data further includes: the terminal device does not send the PDCP layer in the buffer of the PDCP layer before the PDCP layer is switched from sending the uplink data to the first cell group to sending the uplink data to the second cell group. Give the data of the first cell group.
  • the first uplink data further includes: the terminal device switches the PDCP layer by sending the uplink data to the first cell group to the data received by the PDCP layer after transmitting the uplink data to the second cell group.
  • the processing unit 210 may be implemented by a processor, and the transceiver unit 220 may be implemented by a transceiver.
  • the terminal device 300 may include a processor 310, a transceiver 320, and a memory 330.
  • the memory 330 can be used to store indication information, and can also be used to store code, instructions, and the like executed by the processor 310.
  • the various components in the terminal device 300 are connected by a bus system, wherein the bus system includes a power bus, a control bus, and a status signal bus in addition to the data bus.
  • the terminal device 300 shown in FIG. 5 can implement the various processes implemented by the terminal device in the foregoing method embodiment of FIG. 3. To avoid repetition, details are not described herein again. That is to say, the method embodiment in the embodiment of the present invention may be applied to a processor or implemented by a processor.
  • each step of the method embodiment in the embodiment of the present invention may be completed by an integrated logic circuit of hardware in a processor or an instruction in a form of software. More specifically, in combination with the present invention
  • the steps of the method disclosed in the embodiments may be directly implemented by the hardware decoding processor, or may be performed by a combination of hardware and software modules in the decoding processor.
  • the software modules can be located in a conventional storage medium such as random access memory, flash memory, read only memory, programmable read only memory or electrically erasable programmable memory, registers, and the like.
  • the storage medium is located in the memory, and the processor reads the information in the memory and combines the hardware to complete the steps of the above method.
  • the processor mentioned in the embodiment of the present invention may be an integrated circuit chip, which has signal processing capability, and may implement or execute the disclosed methods, steps, and logic blocks in the embodiments of the present invention.
  • the above processor may be a general purpose processor, a digital signal processor (DSP), an application specific integrated circuit (ASIC), a field programmable gate array (FPGA), or Other programmable logic devices, transistor logic devices, discrete hardware components, and the like.
  • the general purpose processor may be a microprocessor or the processor may be any conventional processor or the like.
  • the memory referred to in the embodiments of the present invention may be a volatile memory or a non-volatile memory, or may include both volatile and non-volatile memory.
  • the non-volatile memory may be a read-only memory (ROM), a programmable read only memory (ROMM), an erasable programmable read only memory (erasable PROM, EPROM), or an electrical Erase programmable EPROM (EEPROM) or flash memory.
  • the volatile memory can be a random access memory (RAM) that acts as an external cache.
  • the memory in the embodiment of the present invention may also be a static random access memory (SRAM), a dynamic random access memory (DRAM), or a dynamic random access memory (DRAM).
  • SDRAM Synchronous dynamic random access memory
  • DDR double data rate synchronous dynamic random access memory
  • ESDRAM enhanced synchronous dynamic random access memory
  • SLDRAM synchronous connection Synchro link DRAM
  • DR RAM direct memory bus
  • the singular forms “a”, “the”, “the” and “the” Show other meanings.
  • the words “at time” as used herein may be interpreted as “if” or “if” or “when” or “response” Determine “or” in response to the test.
  • the phrase “if determined” or “if detected (conditions or events stated)” can be interpreted as “when determined” or “in response to determination” or “when detected (stated condition or event) "Time” or “in response to a test (condition or event stated)”.
  • the disclosed systems, devices, and methods may be implemented in other ways.
  • the device embodiments described above are only illustrative.
  • the division of the unit is only a logical function division.
  • multiple units or components may be combined.
  • the mutual 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 in an electrical, mechanical or other form.
  • the units described as separate components may or may not be physically separated, and the components displayed as units may or may not be physical units, that is, 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 embodiments of the present invention.
  • each functional unit in the 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 technical solution of the embodiments of the present invention, or the part contributing to the prior art or the part of the technical solution, may be embodied in the form of a software product stored in a storage medium.
  • a number of instructions are included to cause a computer device (which may be a personal computer, server, or network device, etc.) to perform all or part of the steps of the method described in this embodiment of the invention.
  • the foregoing storage medium includes various media that can store program codes, such as a USB flash drive, a mobile hard disk, a read only memory, a random access memory, a magnetic disk, or an optical disk.

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  • Mobile Radio Communication Systems (AREA)

Abstract

提供了一种切换路径的方法和终端设备，该终端设备具有分组数据汇聚协议PDCP层，该PDCP层可向第一小区组或第二小区组发送上行数据，该第一小区组和该第二小区组为不同的小区组，该PDCP层当前向该第一小区组发送上行数据；该方法包括：该终端设备将该PDCP层由向该第一小区组发送上行数据切换至向该第二小区组发送上行数据；该终端设备向该第二小区组发送第一上行数据，该第一上行数据至少包括第一数据，该第一数据指该终端设备已经发送给该第一小区组的无线链路控制协议RLC层的数据。本发明实施例的方法能够有效提高该终端设备的路径切换性能。

Description

切换路径的方法和终端设备 技术领域
本发明实施例涉及通信领域，并且更具体地，涉及切换路径的方法和终端设备。
背景技术
在长期演进(Long Term Evolution，LTE)中，上层数据到达后停留在分组数据汇聚协议(Packet Data Convergence Protocol，PDCP)层，当主小区组(Master Cell Group，MCG)或者辅小区组(Secondary CG，SCG)有上行资源授权到达用户设备(User Equipment，UE)时，UE再把数据向下送到MCG或者SCG的无线链路层控制协议(Radio Link Control，RLC)层，从而最终发给基站端。
但是，上述技术方案的缺点在于只有等到上行资源授权达到UE时，UE才会将数据从PDCP下发到RLC，产生RLC PDU，并进而产生MAC PDU，对于UE的瞬时处理能力要求太高。
为了克服上述技术方案的缺点，新空口(New Radio，NR)中提供了一种预处理(pre-processing)方案。具体地，允许UE在上行资源授权达到UE之前把数据从PDCP下发到RLC，产生RLC PDU，等到上行资源授权达到之后产生MAC PDU，从而减轻对于UE的瞬时处理能力要求。
但是，该预处理(pre-processing)方案也有一定的负面作用。例如，如果一开始用户在MCG上，并且做了一定量的数据预处理，从PDCP将数据发送到了MCG RLC，然后当用户切换到SCG上时，这部分预处理的数据没有被“切换”，导致切换的性能下降。
发明内容
提供了一种切换路径的方法和终端设备，能够有效提高切换性能。
第一方面，提供了一种切换路径的方法，所述方法应用于终端设备，所述终端设备具有分组数据汇聚协议PDCP层，所述PDCP层可向第一小区组或第二小区组发送上行数据，所述第一小区组和所述第二小区组为不同的小区组，所述PDCP层当前向所述第一小区组发送上行数据；
所述方法包括：
所述终端设备将所述PDCP层由向所述第一小区组发送上行数据切换至向所述第二小区组发送上行数据；所述终端设备向所述第二小区组发送第一上行数据，所述第一上行数据至少包括第一数据，所述第一数据指所述终端设备已经发送给所述第一小区组的无线链路控制协议RLC层的数据。
本发明实施例中，该终端设备的该PDCP层由向该第一小区组发送上行数据切换至向该第二小区组发送上行数据的切换完成后，通过向第二小区组发送已经发送给该第一小区组的RLC层的数据，重新切换这部分没有被“切换”的数据，能够有效提高切换性能。
在一些可能的实现方式中，所述第一数据包括所述终端设备已经发送给所述第一小区组的RLC层的且没有收到正确接收反馈的数据。
在一些可能的实现方式中，所述第一数据包括所述终端设备已经发送给所述第一小区组的RLC层的且没有完全映射到媒体接入控制MAC协议数据单元PDU的数据。
在一些可能的实现方式中，所述终端设备向所述第二小区组发送第一上行数据之前，所述方法还包括：
所述终端设备的PDCP层向所述第一小区组的RLC层发送第一指示信息，所述第一指示信息用于指示所述第一小区组的RLC层清空所述第一数据。
本发明实施例的技术方案，能够进一步提高终端设备的性能。
在一些可能的实现方式中，所述终端设备将所述PDCP层由向所述第一小区组发送上行数据切换至向所述第二小区组发送上行数据之前，所述方法还包括：
所述终端设备接收网络设备发送的第二指示信息，所述第二指示信息用于指示所述终端设备将所述PDCP层由向所述第一小区组发送上行数据切换至向所述第二小区组发送上行数据；其中，所述终端设备将所述PDCP层由向所述第一小区组发送上行数据切换至向所述第二小区组发送上行数据，包括：
所述终端设备根据所述第二指示信息，将所述PDCP层由向所述第一小区组发送上行数据切换至向所述第二小区组发送上行数据。
在一些可能的实现方式中，所述第一上行数据还包括：所述终端设备将 所述PDCP层由向所述第一小区组发送上行数据切换至向所述第二小区组发送上行数据之前，所述PDCP层的缓存中没有发送给所述第一小区组的数据。
在一些可能的实现方式中，所述第一上行数据还包括：所述终端设备将所述PDCP层由向所述第一小区组发送上行数据切换至向所述第二小区组发送上行数据之后，所述PDCP层接收到的数据。
第二方面，提供了一种终端设备，所述终端设备具有分组数据汇聚协议PDCP层，所述PDCP层可向第一小区组或第二小区组发送上行数据，所述第一小区组和所述第二小区组为不同的小区组，所述PDCP层当前向所述第一小区组发送上行数据；
所述终端设备包括：
处理单元，用于将所述PDCP层由向所述第一小区组发送上行数据切换至向所述第二小区组发送上行数据；
收发单元，用于向所述第二小区组发送第一上行数据，所述第一上行数据至少包括第一数据，所述第一数据指所述终端设备已经发送给所述第一小区组的无线链路控制协议RLC层的数据。
第三方面，提供了一种终端设备，所述终端设备具有分组数据汇聚协议PDCP层，所述PDCP层可向第一小区组或第二小区组发送上行数据，所述第一小区组和所述第二小区组为不同的小区组，所述PDCP层当前向所述第一小区组发送上行数据；
所述终端设备包括：
处理器，用于将所述PDCP层由向所述第一小区组发送上行数据切换至向所述第二小区组发送上行数据；
收发器，用于向所述第二小区组发送第一上行数据，所述第一上行数据至少包括第一数据，所述第一数据指所述终端设备已经发送给所述第一小区组的无线链路控制协议RLC层的数据。
应理解，本发明实施例中第二方面和第三方面的终端设备能够执行上述第一方面及各种实现方式中的方法实施例。
第四方面，提供了一种计算机可读介质，用于存储计算机程序，该计算机程序包括用于执行上述第一方面及各种实现方式中的方法实施例的指令。
第五方面，提供了一种计算机芯片，包括：输入接口、输出接口、至少一个处理器、存储器，所述处理器用于执行所述存储器中的代码，当所述代 码被执行时，所述处理器可以实现上述第一方面及各种实现方式中的切换路径的方法中由终端设备执行的各个过程。
第六方面，提供了一种通信系统，包括前述所述的终端设备。
附图说明
图1是本发明实施例的双连接下复制数据的协议架构的示意性图。
图2是本发明实施例的双连接下复制数据的另一协议架构的示意性图。
图3是本发明实施例的切换路径的方法的示意性流程图。
图4是本发明实施例的终端设备的示意性框图。
图5是本发明实施例的另一终端设备的示意性框图。
具体实施方式
应理解，本发明实施例的技术方案可以应用于各种通信系统。例如：全球移动通讯(Global System of Mobile communication，GSM)系统、码分多址(Code Division Multiple Access，CDMA)系统、宽带码分多址(Wideband Code Division Multiple Access，WCDMA)系统、通用分组无线业务(General Packet Radio Service，GPRS)、长期演进(Long Term Evolution，LTE)系统、LTE时分双工(Time Division Duplex，TDD)、通用移动通信系统(Universal Mobile Telecommunication System，UMTS)等。
此外，本发明结合网络设备和终端设备描述了各个实施例。
其中，网络设备可以指网络侧的任一种用来发送或接收信号的实体。例如，可以是机器类通信(MTC)的用户设备、GSM或CDMA中的基站(Base Transceiver Station，BTS)、WCDMA中的基站(NodeB)、LTE中的演进型基站(Evolutional Node B，eNB或eNodeB)、5G网络中的基站设备等。
终端设备可以是任意终端设备。具体地，终端设备可以经无线接入网(Radio Access Network，RAN)与一个或多个核心网(Core Network)进行通信，也可称为接入终端、用户设备(User Equipment，UE)、用户单元、用户站、移动站、移动台、远方站、远程终端、移动设备、用户终端、终端、无线通信设备、用户代理或用户装置。例如，可以是蜂窝电话、无绳电话、会话启动协议(Session Initiation Protocol，SIP)电话、无线本地环路(Wireless Local Loop，WLL)站、个人数字处理(Personal Digital Assistant，PDA)、 具有无线通信功能的手持设备、计算设备或连接到无线调制解调器的其它处理设备、车载设备、可穿戴设备以及5G网络中的终端设备等。
在双连接(Dual Connection，DC)场景下，多个网络节点(小区组(Cell Group，CG))可以为终端设备服务，小区组和终端设备之间可以进行复制数据的传输。
应理解，在本申请实施例中，CG可以等同于网络节点或网络设备等。
具体地，在DC场景下，复制数据传输方式的协议架构可以如图1和图2所示。
如图1和图2所示，DC场景下复制数据传输方式采用采用的是分叉承载(split bearer)的协议架构。对于上下行来说，分组数据汇聚协议(Packet Data Convergence Protocol，PDCP)位于某一个CG(主CG(Master CG，MCG)或者辅CG(Secondary CG，SCG))，该CG为“锚点”CG(anchor CG)。PDCP将PDCP协议数据单元(Protocol Data Unit，PDU)复制为相同的两份，比如一个是PDCP PDU，一个是复制(Duplicated)PDCP PDU，两份PDCP PDU经过不同CG的无线链路控制(Radio Link Control，RLC)层以及媒体接入控制(MediaAccess Control，MAC)层，在经过空口到达终端(下行)或者基站(上行)相应的MAC以及RLC层，最后再汇聚到PDCP，PDCP层监测到两个PDCP为相同的复制版本，即丢弃其中一个，将另外一个递交到高层。
此外，本发明实施例中将PDCP下面分别连接RLC和MAC的这两个承载称为分叉承载(split bearer)，如果PDCP位于MCG，则为MCG Split Bearer，如果PDCP位于SCG，则为SCG Split Bearer。
在本发明实施例中，两份PDCP PDU经过不同CG进行传输，能够达到频率分集增益的目的，进而能够提高数据传输的可靠性。
应理解，本发明实施例中，每一子层会根据协议数据单元的数据的不同，发送到接收端的指定层。其中，进入每个子层未被处理的数据称为服务数据单元(service data unit，SDU)，经过子层处理后形成特定格式的数据被称为协议数据单元(Protocol Data Unit，PDU)。也就是说，SDU是从高层协议传送到低层协议的信息单元，即，SDU的原数据是协议上层的PDU。换句话说，本层形成的PDU即为下一层的SDU。例如，每个终端设备的每个逻辑信道都具有一个RLC实体(RLC entity)，RLC实体从PDCP层接收到的 数据，或发往PDCP层的数据可以称为RLC SDU(或PDCP PDU)。RLC实体从MAC层接收到的数据，或发往MAC层的数据可以称为RLC PDU(或MAC SDU)。还应理解，本发明实施例中，RLC层位于PDCP层和MAC层之间，RLC层可以通过服务接入点(Service Access Point，SAP)与PDCP层进行通信，并通过逻辑信道与MAC层进行通信。但本发明实施例不限于此。
需要注意的是，现有技术中，终端设备可以对数据进行预处理。具体而言，该终端设备可以在上行资源授权达到该终端设备之前把数据从PDCP层下发到RLC层产生RLC PDU，等到上行资源授权达到之后产生MAC PDU。
由此能够减轻对于终端设备的瞬时处理能力要求。
但是，如果终端设备涉及路径切换，有可能导致切换性能过低。
例如，如果一开始终端设备的PDCP层向MCG发送上行数据，并且做了一定量的数据预处理，从PDCP将数据发送到了MCG RLC，然后当该终端设备切换到SCG上时，这部分预处理的数据没有被“切换”会导致切换的性能下降。
因此，本发明实施例中，提出了一种切换路径的方法，能够有效提高终端设备的路径切换性能。下面针对上行链路的场景对本发明实施例的路径切换的方法进行描述。
图3是本发明实施例的终端设备切换路径的方法的示意性流程图。
如图3所示，该方法包括：
110，终端设备将该终端设备的PDCP层由向第一小区组发送上行数据切换至向第二小区组发送上行数据。
120，该终端设备向该第二小区组发送第一上行数据，该第一上行数据至少包括第一数据，该第一数据为该终端设备已经发送给该第一小区组的无线链路控制协议RLC层的数据。
应理解，本发明实施例的切换路径的方法可以应用于具有多个传输路径的终端设备(例如，支持双连接的终端设备)。还应理解，在本发明实施例中采用术语第一小区组和第二小区组，但这些小区组不应限于这些术语。这些术语仅用来将小区组彼此区分开。
具体地，该终端设备具有分组数据汇聚协议PDCP层，该PDCP层可以向第一小区组或第二小区组发送上行数据，该第一小区组和该第二小区组为 不同的小区组，当前的该PDCP层向该第一小区组发送上行数据。即，当前终端设备的PDCP层向该第一小区组发送上行数据。
在该终端设备需要切换路径时，该终端设备将该PDCP层由向该第一小区组发送上行数据切换至向该第二小区组发送上行数据；该终端设备向该第二小区组发送第一上行数据，该第一上行数据至少包括第一数据，该第一数据为该终端设备已经发送给该第一小区组的RLC层的数据。
也就是说，该终端设备的该PDCP层由向该第一小区组发送上行数据切换至向该第二小区组发送上行数据的切换完成后，通过向第二小区组发送已经发送给该第一小区组的RLC层的数据，重新切换这部分没有被“切换”的数据，能够有效提高切换性能。
应理解，本发明实施例中的第一数据包括：为了提高终端设备的切换性能而需要进行切换的已经发送给第一小区组的数据。即，向该第二小区组发送该第一数据的作用是：为了提高该终端设备的切换性能。本发明实施例对该第一数据的具体内容不做限定。
例如，该第一数据可以包括该终端设备已经发送给该第一小区组的RLC层的且没有收到正确接收反馈的数据。
又例如，该第一数据包括该终端设备已经发送给该第一小区组的RLC层的且没有完全映射到媒体介入控制(Media Access Control，MAC)PDU的数据。
还应理解，本发明实施例中的第一上行数据可以包括但不限于该第一数据。
例如，该第一上行数据还可以包括：该终端设备将该PDCP层由向该第一小区组发送上行数据切换至向该第二小区组发送上行数据之前，该PDCP层的缓存中没有发送给该第一小区组的数据。
又例如，该第一上行数据还可以包括：该终端设备将该PDCP层由向该第一小区组发送上行数据切换至向该第二小区组发送上行数据之后，该PDCP层接收到的数据。
进一步地，由于该终端设备在完成路径切换后，会向该第二小区组发送第一上行数据，该第一上行数据至少包括第一数据。
因此，为了进一步提高终端设备的性能，该第一小区组的RLC层可以清空该第一数据。
例如，该终端设备向该第二小区组发送第一上行数据之前，可以向该第一小区组的RLC层发送第一指示信息，该第一指示信息用于指示该第一小区组的RLC层清空该第一数据。以便于该第一小区组的RLC层接收到该第一指示信息后，清空该第一数据。
此外，本发明实施例中，该终端设备将该PDCP层由向该第一小区组发送上行数据切换至向该第二小区组发送上行数据，可以由网络设备配置，也可以预配置，本发明实施例不做具体限定。
例如，作为一个示例，该终端设备可以接收网络设备发送的第二指示信息，该第二指示信息用于指示该终端设备将该PDCP层由向该第一小区组发送上行数据切换至向该第二小区组发送上行数据；然后，该终端设备根据该第二指示信息，将该PDCP层由向该第一小区组发送上行数据切换至向该第二小区组发送上行数据。
具体地，该第二指示信息可以携带在无线资源控制(Radio Resource Control，RRC)信令中。也就是说，终端设备可以根据该RRC信令中的该第二指示信息确定该终端设备是否将该PDCP层由向该第一小区组发送上行数据切换至向该第二小区组发送上行数据。
应理解，上述实施例仅是本发明实施例的示例性说明。本发明实施例旨在通过向第二小区组发送需要进行切换的已经发送给第一小区组的第一数据，进而提高终端设备的切换性能。本发明实施例对第一数据的具体内容和路径的切换方式不做具体限定。
图4是本发明实施例的终端设备200的示意性框图。应理解，该终端设备200具有分组数据汇聚协议PDCP层，该PDCP层可向第一小区组或第二小区组发送上行数据，该第一小区组和该第二小区组为不同的小区组，该PDCP层当前向该第一小区组发送上行数据。
如图4所示，该终端设备200包括：
处理单元210，用于将该PDCP层由向该第一小区组发送上行数据切换至向该第二小区组发送上行数据。
收发单元220，用于向该第二小区组发送第一上行数据，该第一上行数据至少包括第一数据，该第一数据为该终端设备已经发送给该第一小区组的无线链路控制协议RLC层的数据。
可选地，该第一数据包括该终端设备已经发送给该第一小区组的RLC 层的且没有收到正确接收反馈的数据。
可选地，该第一数据包括该终端设备已经发送给该第一小区组的RLC层的且没有完全映射到媒体接入控制MAC协议数据单元PDU的数据。
可选地，该收发单元220还用于：
向该第二小区组发送第一上行数据之前，向该第一小区组的RLC层发送第一指示信息，该第一指示信息用于指示该第一小区组的RLC层清空该第一数据。
可选地，该收发单元220还用于：
将该PDCP层由向该第一小区组发送上行数据切换至向该第二小区组发送上行数据之前，接收网络设备发送的第二指示信息，该第二指示信息用于指示该终端设备将该PDCP层由向该第一小区组发送上行数据切换至向该第二小区组发送上行数据；其中，该处理单元210具体用于：
根据该第二指示信息，将该PDCP层由向该第一小区组发送上行数据切换至向该第二小区组发送上行数据。
可选地，该第一上行数据还包括：该终端设备将该PDCP层由向该第一小区组发送上行数据切换至向该第二小区组发送上行数据之前，该PDCP层的缓存中没有发送给该第一小区组的数据。
可选地，该第一上行数据还包括：该终端设备将该PDCP层由向该第一小区组发送上行数据切换至向该第二小区组发送上行数据之后，该PDCP层接收到的数据。
本发明实施例中，处理单元210可以由处理器实现，收发单元220可由收发器实现。如图5所示，终端设备300可以包括处理器310、收发器320和存储器330。其中，存储器330可以用于存储指示信息，还可以用于存储处理器310执行的代码、指令等。终端设备300中的各个组件通过总线系统相连，其中，总线系统除包括数据总线之外，还包括电源总线、控制总线和状态信号总线。
图5所示的终端设备300能够实现前述图3的方法实施例中由终端设备所实现的各个过程，为避免重复，这里不再赘述。也就是说，本发明实施例中的方法实施例可以应用于处理器中，或者由处理器实现。
在实现过程中，本发明实施例中的方法实施例的各步骤可以通过处理器中的硬件的集成逻辑电路或者软件形式的指令完成。更具体地，结合本发明 实施例公开的方法的步骤可以直接体现为硬件译码处理器执行完成，或者用译码处理器中的硬件及软件模块组合执行完成。软件模块可以位于随机存储器，闪存、只读存储器，可编程只读存储器或者电可擦写可编程存储器、寄存器等本领域的成熟的存储介质中。该存储介质位于存储器，处理器读取存储器中的信息，结合其硬件完成上述方法的步骤。
应理解，本发明实施例中提及的处理器可能是一种集成电路芯片，具有信号的处理能力，可以实现或者执行本发明实施例中的公开的各方法、步骤及逻辑框图。例如，上述的处理器可以是通用处理器、数字信号处理器(digital signal processor，DSP)、专用集成电路(application specific integrated circuit，ASIC)、现成可编程门阵列(field programmable gate array，FPGA)或者其他可编程逻辑器件、晶体管逻辑器件、分立硬件组件等等。此外，通用处理器可以是微处理器或者该处理器也可以是任何常规的处理器等。
此外，本发明实施例中提及的存储器可以是易失性存储器或非易失性存储器，或可包括易失性和非易失性存储器两者。其中，非易失性存储器可以是只读存储器(read-only memory，ROM)、可编程只读存储器(programmable ROM，PROM)、可擦除可编程只读存储器(erasable PROM，EPROM)、电可擦除可编程只读存储器(electrically EPROM，EEPROM)或闪存。易失性存储器可以是随机存取存储器(random access memory，RAM)，其用作外部高速缓存。应理解，上述存储器为示例性但不是限制性说明，例如，本发明实施例中的存储器还可以是静态随机存取存储器(static RAM，SRAM)、动态随机存取存储器(dynamic RAM，DRAM)、同步动态随机存取存储器(synchronous DRAM，SDRAM)、双倍数据速率同步动态随机存取存储器(double data rate SDRAM，DDR SDRAM)、增强型同步动态随机存取存储器(enhanced SDRAM，ESDRAM)、同步连接动态随机存取存储器(synch link DRAM，SLDRAM)以及直接内存总线随机存取存储器(Direct Rambus RAM，DR RAM)等等。也就是说，本文描述的系统和方法的存储器旨在包括但不限于这些和任意其它适合类型的存储器。
最后，需要注意的是，在本发明实施例和所附权利要求书中使用的术语是仅仅出于描述特定实施例的目的，而非旨在限制本发明实施例。
例如，在本发明实施例和所附权利要求书中所使用的单数形式的“一种”、“所述”、“上述”和“该”也旨在包括多数形式，除非上下文清楚地表 示其他含义。又例如，取决于语境，如在此所使用的词语“在......时”可以被解释成为“如果”或“若”或“当......时”或“响应于确定”或“响应于检测”。类似地，取决于语境，短语“如果确定”或“如果检测(陈述的条件或事件)”可以被解释成为“当确定时”或“响应于确定”或“当检测(陈述的条件或事件)时”或“响应于检测(陈述的条件或事件)”。
本领域普通技术人员可以意识到，结合本文中所公开的实施例描述的各示例的单元及算法步骤，能够以电子硬件、或者计算机软件和电子硬件的结合来实现。这些功能究竟以硬件还是软件方式来执行，取决于技术方案的特定应用和设计约束条件。专业技术人员可以对每个特定的应用来使用不同方法来实现所描述的功能，但是这种实现不应认为超出本发明实施例的范围。
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，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是示意性的，例如，所述单元的划分，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发明实施例的目的。
另外，在本发明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。
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，本发明实施例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)执行本发明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、随机存取存储器、磁碟或者光盘等各种可以存储程序代码的介质。
以上内容，仅为本发明实施例的具体实施方式，但本发明实施例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实施例揭露的技术范围内，可轻易想到变化或替换，都应涵盖在本发明实施例的保护范围之内。因此，本发明实施例的保护范围应以权利要求的保护范围为准。

Claims (14)

  1. 一种切换路径的方法，其特征在于，应用于终端设备，所述终端设备具有分组数据汇聚协议PDCP层，所述PDCP层可向第一小区组或第二小区组发送上行数据，所述第一小区组和所述第二小区组为不同的小区组，所述PDCP层当前向所述第一小区组发送上行数据；
    所述方法包括：
    所述终端设备将所述PDCP层由向所述第一小区组发送上行数据切换至向所述第二小区组发送上行数据；
    所述终端设备向所述第二小区组发送第一上行数据，所述第一上行数据至少包括第一数据，所述第一数据为所述终端设备已经发送给所述第一小区组的无线链路控制协议RLC层的数据。
  2. 根据权利要求1所述的方法，其特征在于，所述第一数据包括所述终端设备已经发送给所述第一小区组的RLC层的且没有收到正确接收反馈的数据。
  3. 根据权利要求1或2所述的方法，其特征在于，所述第一数据包括所述终端设备已经发送给所述第一小区组的RLC层的且没有完全映射到媒体接入控制MAC协议数据单元PDU的数据。
  4. 根据权利要求1至3中任一项所述的方法，其特征在于，所述终端设备向所述第二小区组发送第一上行数据之前，所述方法还包括：
    所述终端设备的PDCP层向所述第一小区组的RLC层发送第一指示信息，所述第一指示信息用于指示所述第一小区组的RLC层清空所述第一数据。
  5. 根据权利要求1至4中任一项所述的方法，其特征在于，所述终端设备将所述PDCP层由向所述第一小区组发送上行数据切换至向所述第二小区组发送上行数据之前，所述方法还包括：
    所述终端设备接收网络设备发送的第二指示信息，所述第二指示信息用于指示所述终端设备将所述PDCP层由向所述第一小区组发送上行数据切换至向所述第二小区组发送上行数据；
    其中，所述终端设备将所述PDCP层由向所述第一小区组发送上行数据切换至向所述第二小区组发送上行数据，包括：
    所述终端设备根据所述第二指示信息，将所述PDCP层由向所述第一小区组发送上行数据切换至向所述第二小区组发送上行数据。
  6. 根据权利要求1至5中任一项所述的方法，其特征在于，所述第一上行数据还包括：所述终端设备将所述PDCP层由向所述第一小区组发送上行数据切换至向所述第二小区组发送上行数据之前，所述PDCP层的缓存中没有发送给所述第一小区组的数据。
  7. 根据权利要求1至6中任一项所述的方法，其特征在于，所述第一上行数据还包括：所述终端设备将所述PDCP层由向所述第一小区组发送上行数据切换至向所述第二小区组发送上行数据之后，所述PDCP层接收到的数据。
  8. 一种终端设备，其特征在于，所述终端设备具有分组数据汇聚协议PDCP层，所述PDCP层可向第一小区组或第二小区组发送上行数据，所述第一小区组和所述第二小区组为不同的小区组，所述PDCP层当前向所述第一小区组发送上行数据；
    所述终端设备包括：
    处理单元，用于将所述PDCP层由向所述第一小区组发送上行数据切换至向所述第二小区组发送上行数据；
    收发单元，用于向所述第二小区组发送第一上行数据，所述第一上行数据至少包括第一数据，所述第一数据为所述终端设备已经发送给所述第一小区组的无线链路控制协议RLC层的数据。
  9. 根据权利要求8所述的终端设备，其特征在于，所述第一数据包括所述终端设备已经发送给所述第一小区组的RLC层的且没有收到正确接收反馈的数据。
  10. 根据权利要求8或9所述的终端设备，其特征在于，所述第一数据包括所述终端设备已经发送给所述第一小区组的RLC层的且没有完全映射到媒体接入控制MAC协议数据单元PDU的数据。
  11. 根据权利要求8至10中任一项所述的终端设备，其特征在于，所述收发单元还用于：
    向所述第二小区组发送第一上行数据之前，向所述第一小区组的RLC层发送第一指示信息，所述第一指示信息用于指示所述第一小区组的RLC层清空所述第一数据。
  12. 根据权利要求8至11中任一项所述的终端设备，其特征在于，所述收发单元还用于：
    将所述PDCP层由向所述第一小区组发送上行数据切换至向所述第二小区组发送上行数据之前，接收网络设备发送的第二指示信息，所述第二指示信息用于指示所述终端设备将所述PDCP层由向所述第一小区组发送上行数据切换至向所述第二小区组发送上行数据；
    其中，所述处理单元具体用于：
    根据所述第二指示信息，将所述PDCP层由向所述第一小区组发送上行数据切换至向所述第二小区组发送上行数据。
  13. 根据权利要求8至12中任一项所述的终端设备，其特征在于，所述第一上行数据还包括：所述终端设备将所述PDCP层由向所述第一小区组发送上行数据切换至向所述第二小区组发送上行数据之前，所述PDCP层的缓存中没有发送给所述第一小区组的数据。
  14. 根据权利要求8至12中任一项所述的终端设备，其特征在于，所述第一上行数据还包括：所述终端设备将所述PDCP层由向所述第一小区组发送上行数据切换至向所述第二小区组发送上行数据之后，所述PDCP层接收到的数据。
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