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WO2018082054A1 - 通信方法及通信设备 - Google Patents

通信方法及通信设备 Download PDF

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Publication number
WO2018082054A1
WO2018082054A1 PCT/CN2016/104751 CN2016104751W WO2018082054A1 WO 2018082054 A1 WO2018082054 A1 WO 2018082054A1 CN 2016104751 W CN2016104751 W CN 2016104751W WO 2018082054 A1 WO2018082054 A1 WO 2018082054A1
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WO
WIPO (PCT)
Prior art keywords
terminal
network device
link
rrc connection
relay
Prior art date
Application number
PCT/CN2016/104751
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English (en)
French (fr)
Inventor
肖潇
曹振臻
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 PCT/CN2016/104751 priority Critical patent/WO2018082054A1/zh
Publication of WO2018082054A1 publication Critical patent/WO2018082054A1/zh

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    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04W—WIRELESS COMMUNICATION NETWORKS
    • H04W36/00—Hand-off or reselection arrangements
    • H04W36/14—Reselecting a network or an air interface
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04W—WIRELESS COMMUNICATION NETWORKS
    • H04W36/00—Hand-off or reselection arrangements
    • H04W36/24—Reselection being triggered by specific parameters
    • H04W36/30—Reselection being triggered by specific parameters by measured or perceived connection quality data
    • H04W36/302—Reselection being triggered by specific parameters by measured or perceived connection quality data due to low signal strength
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
    • Y02D—CLIMATE CHANGE MITIGATION TECHNOLOGIES IN INFORMATION AND COMMUNICATION TECHNOLOGIES [ICT], I.E. INFORMATION AND COMMUNICATION TECHNOLOGIES AIMING AT THE REDUCTION OF THEIR OWN ENERGY USE
    • Y02D30/00—Reducing energy consumption in communication networks
    • Y02D30/70—Reducing energy consumption in communication networks in wireless communication networks

Definitions

  • the present invention relates to the field of communications technologies, and in particular, to a communication method and a communication device.
  • wearable devices With the advent and increasing popularity of smart watches, smart bracelets, and smart glasses, wearable devices have become a popular electronic product worldwide. Wearable device-based applications and communication technologies for wearable devices have become a research hotspot in the global telecommunications industry.
  • a wearable device such as a smart watch, a wristband, or a watch usually establishes a wireless connection with a cellular network and communicates through a smart phone, so that the user can directly pass through each of the wearable devices.
  • Application Application, referred to as APP
  • APP Application
  • the network to send and receive various types of multimedia business data, to avoid the inconvenience caused by the smart phone, inconvenient to carry and other issues, convenient and fast.
  • FIG 1 shows a schematic diagram of wearable device communication.
  • the wearable device such as a smart watch or smart glasses transmits data to the smart phone through a through link; then, the smart phone acts as a relay terminal (Relay User), and the data passes through the cellular uplink (Uplink).
  • the base station is sent to the Long Term Evolution (LTE) system to complete the transmission of wearable data.
  • LTE Long Term Evolution
  • the base station sends data to the Relay UE through the downlink (Downlink), and the relay UE sends the data to the wearable device through the through link to complete data reception of the wearable device.
  • the wearable device is generally referred to as a Remote User Equipment (Remote UE).
  • Remote User Equipment Remote User Equipment
  • a communication method in which a wearable device performs relay transmission through a UE which is also referred to as a UE-to-Network Relay.
  • wearable device communication has the following two characteristics:
  • the wearable device should use the "UE-network" method as much as possible.
  • the Remote UE uses short-range communication technology to transmit data to the Relay UE through the through link, and then the Relay UE forwards the data to the base station to achieve the end. May save power.
  • the business continuity requirement The most important service type and application scenario of the wearable device is a voice call, which usually has high requirements for service continuity.
  • the wearable device may interrupt the connection with the Relay UE due to the communication range of the Relay UE (which may also be the coverage of the Relay UE), it is necessary to switch to the cellular uplink and downlink to directly communicate with the base station. In this process, the data transmission of the wearable device is required to be as short as possible to maintain business continuity.
  • the direct link between the Remote UE and the Relay UE adopts a short-distance direct-pass technology based on wifi
  • the "UE-network" relay transmission method is the currently used "wifi" hotspot technology, that is, the smart phone is turned on.
  • the "wifi hotspot” function the wearable device transmits data to the wifi hotspot via wifi, and then transmits the data to the cellular base station by the wifi hotspot; or the base station sends the data to the wifi hotspot, and the data is sent by the wifi hotspot to the wearable device through the wifi.
  • Figure 2 shows a schematic diagram of the process of "UE-network" relay transmission.
  • the Remote UE when the Remote UE is gradually away from the Relay UE, the wifi signal is gradually weakened, and the coverage of the Relay UE may be removed, resulting in interruption of communication with the Relay UE. At this time, the Remote UE will establish a connection with the base station and further continue data transmission and reception through the uplink/downlink of the base station.
  • the connection establishment with the base station is initiated, and only after the connection with the base station is established, the uplink/downlink of the base station can continue to communicate with the base station, which is
  • the data transmission is interrupted during the process of establishing a connection between the Remote UE and the base station, and the interruption time can be as long as several seconds, which seriously affects the communication performance.
  • 3GPP standardizes the "UE-network" relay technology based on LTE D2D in the Release-13 protocol version.
  • the direct link between the Relay UE and the Remote UE is a short-distance communication technology based on LTE D2D, and the air interface corresponding to the through link is referred to as a “PC5 interface”.
  • the system is A number of "resource pools" are defined on the through link; a resource pool is a collection of "time-frequency" resources.
  • the remote UE uses the resources in the resource pool to send data to the Relay UE, and the relay UE forwards the data to the base station through the uplink of the cellular network, or the base station sends the data to the Remote UE through the relay UE relay.
  • FIG. 3 is a schematic diagram of a “UE-network” relay mode based on LTE D2D.
  • the Remote UE determines data transmission and reception according to the link quality with the base station. path.
  • the Remote UE located outside the coverage of the base station or covering the edge of the base station usually connects with the Relay UE and performs data transmission and reception with the base station by means of “UE-network” relay.
  • the Remote UE moves from the coverage of the base station or the coverage edge to the coverage, if there is acceptable cellular link quality (such as RSRP/RSRP), the cellular connection will be established with the base station, and The uplink and downlink between the base stations perform subsequent data transmission and reception, and terminate the data transmission and reception through the Relay UE even if it is still within the coverage of the Relay UE.
  • the Remote UE transmits the uplink and downlink as much as possible, that is, even if the Remote UE is within the coverage of the Relay UE, as long as it Can communicate using the cellular uplink and downlink, and will not transfer data through the Relay UE.
  • the communication distance between the Relay UE and the base station is much longer than the distance between the Relay UE and the Reote UE, and thus the transmission power consumption is high. Therefore, the existing "UE-network" relay technology based on LTE D2D may cause the Remote UE to generate high transmission power consumption, and is particularly unsuitable for devices with limited battery capacity such as wearable devices.
  • the existing LTE D2D-based "UE-network" relay technology has a disadvantage in that it will cause excessively high Remote UE transmission power consumption, and is particularly unsuitable for a battery capacity limited device such as a wearable device.
  • the embodiment of the present invention provides a communication method and a communication device, which are used to implement the "UE-network" relay technology, and ensure the service continuity of the Remote UE when leaving the Relay UE under the premise of saving the power consumption of the Remote UE as much as possible.
  • an embodiment of the present invention provides a communication method, including: a first terminal communicating with a network device by using a second terminal as a relay device; and determining, by the first terminal, the first terminal and the second terminal The pass-through link quality is lower than the pass-through link quality threshold, triggering to switch data transmission from the direct link between the first terminal and the second terminal to the first terminal and the network device Uplink and/or downlink communication links between.
  • the uplink and/or downlink communication link between the first terminal and the network device ensures service continuity of communication between the first terminal and the network device, and communicates with the network device by using a relay manner as much as possible. The purpose of saving the power of the first terminal as much as possible is achieved.
  • the pass-through link quality threshold is configured by the network device to the first terminal, or pre-configured in the first terminal. Thereby, a pass-through link quality threshold can be configured for the first terminal.
  • the first terminal before the first terminal communicates with the network device by using the second terminal as the relay device, the first terminal establishes a radio resource control RRC connection with the network device by using the second terminal. Thereby, the first terminal can enable the data transmission and reception of the relay mode with the network device through the second terminal, instead of adopting the uplink or downlink of the cellular network.
  • the first terminal triggers to switch data transmission from a direct link between the first terminal and the second terminal to an uplink between the first terminal and the network device.
  • a downlink communication link comprising: the first terminal triggering using a cell radio network temporary identifier C-RNTI dedicated to the first terminal, and transmitting data from the first terminal to the second terminal
  • the pass-through link switches to an uplink and/or downlink communication link between the first terminal and the network device.
  • the first terminal after the first terminal establishes a radio resource control RRC connection with the network device, the first terminal triggers to switch data transmission from the direct link between the first terminal and the second terminal to Before the uplink and/or downlink communication link between the first terminal and the network device, the first terminal acquires, by using the second terminal, the C that is allocated by the network device to the first terminal -RNTI. Thereby, the required parameters can be provided for switching data transmissions from the through link to the uplink and/or downlink communication links between the first terminal and the network device.
  • the first terminal acquires, by using the second terminal, the C-RNTI that is allocated by the network device to the first terminal, where the first terminal acquires by using the second terminal.
  • the RRC connection reconfiguration message sent by the network device, where the RRC connection reconfiguration message carries the C-RNTI allocated to the first terminal.
  • the first terminal before the first terminal acquires, by the second terminal, the C-RNTI that is allocated by the network device to the first terminal, the first terminal passes the second terminal to the The network device sends a direct link pre-interrupt indication, where the direct link pre-interrupt indication is used to indicate that communication between the first terminal and the second terminal is about to be interrupted. Thereby, the network device can be triggered to allocate the C-RNTI to the first terminal through the through link pre-interrupt indication.
  • the first terminal acquires the through-link configured by the network device by using the second terminal Quality threshold.
  • the first terminal establishes a radio resource control RRC connection with the network device by using the second terminal, where the first terminal sends an RRC connection request message to the second terminal, where The second terminal sends the RRC connection request message to the network device; the first terminal receives an RRC connection setup message that is sent by the network device by using the second terminal, and the first terminal sends the The second terminal sends an RRC connection setup complete message, and the second terminal sends the RRC connection setup complete message to the network device.
  • the first terminal establishes an RRC connection with the network device by using the second terminal as the relay device.
  • the RRC connection request message, the RRC connection setup message, and the RRC connection setup complete message respectively carry indication information of the first terminal. Thereby enabling the second terminal and the network device to distinguish the RRC message from the first terminal.
  • the embodiment of the present invention provides a communication method, including: the network device uses the second terminal as a relay device to communicate with the first terminal; and the network device switches to use the first terminal and the network device Data transmission between the uplink and/or downlink communication link and the first terminal, wherein the first terminal determines that the direct link between the first terminal and the second terminal is of low quality After the pass-through link quality threshold, triggering to switch data transmission from the direct link between the first terminal and the second terminal to uplink and/or downlink between the first terminal and the network device Communication link.
  • the method before the network device communicates with the first terminal by using the second terminal as the relay device, the method further includes: the network device establishing a radio resource with the first terminal by using the second terminal Control RRC connection.
  • the network device after the network device establishes a radio resource control RRC connection with the first terminal by using the second terminal, the network device switches to pass between the first terminal and the network device.
  • the method further includes:
  • the network device allocates, by using the second terminal, the cell radio network temporary identifier C-RNTI dedicated to the first terminal to the first terminal.
  • the network device by using the second terminal, to allocate, to the first terminal, a cell radio network temporary identifier C-RNTI dedicated to the first terminal, including:
  • the network device sends an RRC connection reconfiguration message to the first terminal by using the second terminal, where the RRC connection reconfiguration message carries the C-RNTI allocated to the first terminal.
  • the method before the network device allocates the first terminal-specific cell radio network temporary identifier C-RNTI to the first terminal by using the second terminal, the method further includes:
  • the network device receives, by the second terminal, a through link pre-interrupt indication sent by the first terminal, where the through link pre-interrupt indication is used to indicate between the first terminal and the second terminal Communication is about to break.
  • the method before the network device switches to data transmission with the first terminal by using an uplink and/or downlink communication link between the first terminal and the network device, the method further includes :
  • the network device configures the through link quality threshold to the first terminal by using the second terminal.
  • an embodiment of the present invention provides a terminal, where the terminal has the function of implementing the foregoing first aspect and the method implementation of the second aspect, where the function may be implemented by hardware or by hardware.
  • Corresponding software implementations that include one or more modules corresponding to the functions described above.
  • the embodiment of the present invention provides a network device, where the terminal has the function of implementing the network device in the implementation of the foregoing first aspect and the second aspect, and the function may be implemented by hardware or by hardware.
  • Corresponding software implementations that include one or more modules corresponding to the functions described above.
  • an embodiment of the present invention provides a terminal, including a processor, a memory, and a transceiver, wherein a preset program is stored in the memory, and the processor reads a program in the memory, and executes the first according to the program. Aspect method.
  • an embodiment of the present invention provides a network device, including a processor, a memory, and a transceiver, where a preset program is stored in the memory, and the processor reads a program in the memory, and executes the foregoing according to the program.
  • FIG. 1 is a schematic diagram of a prior art wearable device communication
  • FIG. 2 is a schematic diagram of a process of a relay transmission of a UE-network in the prior art
  • FIG. 3 is a schematic diagram of a “UE-network” relay mode based on LTE D2D in the prior art
  • FIG. 4 is a schematic diagram of an application scenario of an embodiment of the present invention.
  • FIG. 5 is a schematic diagram of a communication process according to an embodiment of the present invention.
  • FIG. 6 is a schematic flowchart of maintaining service continuity in an embodiment of the present invention.
  • FIG. 7 is a schematic flowchart of another process for maintaining service continuity according to an embodiment of the present invention.
  • FIG. 8 is a schematic flowchart of another process for maintaining service continuity according to an embodiment of the present invention.
  • FIG. 9 is a schematic structural diagram of a terminal according to an embodiment of the present invention.
  • FIG. 10 is a schematic structural diagram of a network device according to an embodiment of the present invention.
  • FIG. 11 is a schematic structural diagram of another terminal according to an embodiment of the present invention.
  • FIG. 12 is a schematic structural diagram of another network device according to an embodiment of the present invention.
  • the embodiment of the present invention provides a communication method and a communication device.
  • the embodiment of the present invention establishes a communication connection with the base station directly before the Remote UE is about to leave the coverage of the Relay UE, to avoid communication interruption, and when the Remote UE is located in the coverage of the Relay UE, the relay UE transits as much as possible.
  • Data transmission and reception is performed using "UE-network" relay technology to save transmission power consumption.
  • the application scenario of the present invention is as shown in FIG. 4.
  • the scenario mainly includes a first terminal 401, a second terminal 402, and a network device 403, where the first terminal is in the coverage of the second terminal, and the second terminal is used as a relay. Communicate with network devices.
  • the embodiment of the present invention is improved based on the "UE-network" relay technology of LTE D2D.
  • the first terminal is a Remote UE and the second terminal is a Relay UE.
  • the detailed method for communicating the Remote UE with the network device is as follows:
  • Step 501 The first terminal communicates with the network device by using the second terminal as a relay device.
  • the first terminal before the first terminal communicates with the network device by using the second terminal as the relay device, the first terminal establishes radio resource control (Radio Resource Control) with the network device by using the second terminal. RRC) connection.
  • radio resource control Radio Resource Control
  • the first UE and the second terminal perform Relay UE discovery and connection establishment based on the LTE D2D technology on the sidelink. That is, the first terminal discovers the terminal existing around the first terminal through the Relay Discovery Message broadcasted by the second terminal on the through link, and the terminal that can cover the first terminal in the surrounding terminal is used as the terminal.
  • a second terminal the first terminal sends a direct communication request to the second terminal, and after the second terminal performs authentication and security verification on the first terminal according to the direct communication request, the direct link between the first terminal and the second terminal The path establishes a connection, and then the first terminal and the second terminal can perform direct data interaction through the connection established on the through link.
  • the specific process of the first terminal establishing an RRC connection with the network device by using the second terminal is: the first terminal sends an RRC connection request message to the second terminal, where the second terminal The RRC connection request message is sent to the network device; the first terminal receives an RRC connection setup message that is sent by the network device by using the second terminal, and the first terminal sends an RRC connection to the second terminal. And establishing, by the second terminal, the RRC connection setup complete message to the network device.
  • the RRC connection request message, the RRC connection setup message, and the RRC connection setup complete message respectively carry indication information of the first terminal.
  • the second terminal needs to distinguish whether the data received from the first terminal is the service data or the RRC message as the control signaling, and the specific implementation manner is: Packet Data Protocol Convergence corresponding to the RRC message.
  • the protocol data unit (Protocol Data Unit) of the protocol layer uses the value of the dedicated PDCP SDU Type, so that the second terminal can determine, according to the value, whether the encapsulated in the corresponding PDCP PDU is from the first terminal or the network device.
  • the RRC message that needs to be sent to the first terminal; or the RRC message sent by the first terminal or the RRC message sent by the first terminal to the second terminal adopts a dedicated logical channel identifier. (Logical Channel Identifier, LCID). This is only an example. The application can also be distinguished in other ways. It is not listed here.
  • Step 502 The first terminal determines that the quality of the direct link between the first terminal and the second terminal is lower than the quality of the through link, and triggers data transmission from the first terminal and the second terminal.
  • the pass-through link between the two switches to an uplink and/or downlink communication link between the first terminal and the network device.
  • the quality of the through link may be characterized by a combination of one or more of the following parameters: Slinking Reference Signal Received Power (S-RSRP), Relay in LTE D2D technology Discover the signal strength of the message, etc.
  • S-RSRP Slinking Reference Signal Received Power
  • Relay in LTE D2D technology Discover the signal strength of the message, etc.
  • the measurement manner of the quality of the through link is not limited. Specifically, the measurement may be performed according to the configuration of the network device, for example, periodically according to the configured measurement period.
  • the pass-through link quality threshold is configured by the network device to the first terminal, or pre-configured in the first terminal. Specifically, the first terminal acquires the through link quality threshold configured by the network device by using the second terminal. In the embodiment of the present invention, when the quality of the through link between the first terminal and the second terminal is lower than the quality threshold of the through link, the first terminal and the second terminal are configured by the reasonable configuration of the quality threshold of the through link.
  • the communication can be continued, so as to ensure that the first terminal can perform data transmission with the network device by using the second terminal as the relay device in the process of establishing the RRC connection with the base station, thereby ensuring that the first terminal is leaving the second terminal. Business continuity when covering.
  • the first terminal triggers the Cell Radio Network Temporary Identity (C-RNTI), which is used by the first terminal, to transmit data from the first terminal and the second terminal.
  • C-RNTI Cell Radio Network Temporary Identity
  • the pass-through link between the two ends is switched to an uplink and/or downlink communication link between the first terminal and the network device, and the network device performs data transmission through an uplink and/or downlink communication link.
  • the first terminal establishes a radio resource control RRC connection with the network device by using the second terminal. After receiving, the first terminal acquires, by the second terminal, the C-RNTI allocated by the network device to the first terminal.
  • the first terminal acquires an RRC connection reconfiguration message sent by the network device by using the second terminal, where the RRC connection reconfiguration message carries a location allocated to the first terminal. Said C-RNTI.
  • the first terminal sends a through link pre-interrupt indication to the network device by using the second terminal, where the direct link pre-interrupt indication is used to indicate the first terminal and the second terminal
  • the communication between the two is about to be interrupted; the network device allocates the C-RNTI to the first terminal through the second terminal. For example, if the signal strength of the first terminal on the through link is lower than a preset threshold or leaves the coverage of the second terminal, it is determined that the communication between the first terminal and the second terminal is about to be interrupted.
  • Step 503 The network device switches to perform data transmission with the first terminal by using an uplink and/or downlink communication link between the first terminal and the network device.
  • the first terminal determines that the quality of the direct link between the first terminal and the second terminal is lower than the quality threshold of the through link in the process of performing data communication between the second terminal and the network device. Transmitting the data transmission from the through link to the uplink and/or downlink communication link between the first terminal and the network device, so that the first terminal can be avoided because the power of the first terminal is saved as much as possible Mobility causes data transmission interruption, which ensures the business continuity of the first terminal.
  • the first specific embodiment, as shown in FIG. 6, the specific process of maintaining business continuity is as follows:
  • Step 1 The Remote UE and the Relay UE perform Relay UE discovery and connection establishment based on the existing LTE D2D technology on the direct link.
  • This step directly multiplexes the related mechanisms and process implementations in the existing LTE D2D-based "UE-network" relay technology.
  • the Relay Discovery Message broadcasted by the Remote UE over the direct link through the Relay UE (Relay Discovery Message) ), discovering the Relay UE that exists around, and Located in the coverage of the Relay UE; the Remote UE sends a direct communication request to the Relay UE, and the Remote UE authenticates and securely authenticates the Remote UE.
  • the Remote UE After the Remote UE establishes a connection with the Relay UE's direct communication link, the Remote UE Direct data interaction with the Relay UE.
  • the Remote UE can perform data transmission and reception with the Relay UE on the through link, and then realize data transmission with the base station through the "UE-network" relay technology.
  • Step 2 The Remote UE measures the quality of the through link between the Remote UE and the Relay UE by using the correlation signal strength with the Relay UE.
  • the quality of the pass-through link has multiple manifestations, including but not limited to the following, and the short-link reference signal received power (S-RSRP) strength or Relay discovery message in the LTE D2D. Signal strength.
  • the Remote UE obtains the quality of the through link between the Remote UE and the Relay UE by measuring the signal strength of the through link reference signal received power or the Relay discovery message.
  • the Remote UE periodically and continuously performs measurement of the quality of the through link.
  • the specific measurement period is configured by the base station by using a radio resource control (RRC) reconfiguration message (RRC Connection Reconfiguration), and the measurement period depends on the implementation of the network device, and is not specifically limited herein.
  • RRC radio resource control
  • Step 3 The Remote UE adopts a “UE-network” relay technology, and establishes an RRC connection with the base station by means of relay UE relay.
  • the RRC connection establishment process multiplexes the RRC connection establishment related procedure and the RRC message in the existing LTE system, and the only difference is that the Remote UE performs the RRC message interaction related to the RRC connection establishment by the relay UE in the relay UE transit mode. Instead of directly interacting with the base station through the uplink and downlink of the cellular network of the LTE system, the RRC message is directly exchanged.
  • the Remote UE sends an RRC Connection Request message to the Relay UE through the through link, and the Relay UE forwards the RRC connection request message to the base station through the uplink; the base station uses the downlink to The Relay UE sends an RRC Connection Setup message, and the Relay UE forwards the RRC connection setup message to the Remote UE; the Remote UE sends the RRC Connection Setup Complete to the Relay UE.
  • the Connection Setup Complete message is forwarded by the Relay UE to the base station to complete the RRC connection establishment process of the Remote UE.
  • the Relay UE distinguishes whether the data received from the Remote UE is service data or an RRC message as control signaling.
  • the specific distinguishing method is that the value of the dedicated PDCP SDU Type (for example, "111" is used in the Protocol Data Unit (PDU) of the Packet Data Convergence Protocol (PDCP) protocol layer corresponding to the RRC message.
  • the relay UE can determine, by using the value, that the encapsulated data in the PDCP PDU is from the Remote UE, or that the encapsulated data in the PDCP PDU is sent by the base station to the Remote UE; or the RRC sent to the Remote UE or sent to the Remote UE.
  • the message is identified by a dedicated Logical Channel Identifier (LCID). It should be noted that the description is not intended to limit the scope of the present invention.
  • LCID Logical Channel Identifier
  • the Remote UE can only perform data transmission and reception based on the “UE-network” relay by using the Relay UE and the base station, instead of directly performing uplink and downlink communication with the base station.
  • Step 4 After the RRC connection of the Remote UE is established, the base station sends an RRC Connection Reconfiguration (RRC Connection Reconfiguration) message to the Remote UE by using the relay UE transit mode, where the RRC connection reconfiguration message includes at least: a pass-through link quality threshold. And the C-RNTI dedicated to Remote UE.
  • RRC Connection Reconfiguration RRC Connection Reconfiguration
  • the base station sends the RRC connection reconfiguration message to the Remote UE by means of relay UE relay.
  • the relay UE may use the method listed in step 3 to determine that the RRC connection reconfiguration message is received from the base station, instead of the service data, and forward the RRC connection reconfiguration message to the Remote UE.
  • the RRC connection reconfiguration message includes at least a pass-through link quality threshold and a C-RNTI.
  • the RRC connection reconfiguration message may also include other information in the RRC connection reconfiguration message in other existing LTE systems.
  • the specific parameters used by the through link correspond to step 2 (eg, S-RSRP strength, signal strength of Relay discovery message, or others). Specifically, the specificity of the quality threshold of the through link is taken. The value depends on the specific implementation of the base station, and is not specifically limited herein.
  • Step 5 The Remote UE determines whether the measured pass-through link quality is lower than the pass-through link quality threshold configured by the base station, and if yes, the Remote UE initiates an RRC connection establishment procedure with the base station, and uses the C allocated by the base station. - RNTI, the data transmission is transferred from the Relay UE through link to the uplink and downlink of the cellular network, and the subsequent data is directly transmitted and received with the base station.
  • the Remote UE is triggered to establish an RRC connection with the base station, and the service data is from the Relay link being used ("UE - Network "relay" is switched to the uplink and downlink of the cellular network, and subsequent data transmission is directly performed with the base station.
  • the pass-through link quality is lower than the pass-through link quality threshold configured by the base station, indicating that the Remote UE signal is weak, and may soon leave the coverage of the Relay UE, thereby triggering an RRC connection establishment process between the Remote UE and the base station, and Data is transferred to the uplink and downlink of the cellular network for transmission.
  • the reasonable quality of the pass-through link quality threshold between the Remote UE and the Relay UE is such that the quality of the direct link between the Remote UE and the Relay UE is not lower than the quality of the pass-through link.
  • Communicating with the Relay UE, and making the quality of the direct link between the Remote UE and the Relay UE lower than the pass-through link quality threshold, and the data transmission based on the "UE-network" relay by the Relay UE is not interrupted.
  • the Remote UE can still perform data transmission based on the “UE-network” relay through the Relay UE during the establishment of the RRC connection with the base station. Business continuity when the Remote UE leaves the Remote UE.
  • Steps 1 to 3 are the same as the first embodiment.
  • Step 4 After the RRC connection of the Remote UE is established, the base station sends an RRC connection reconfiguration message to the Remote UE by using the relay UE transit mode, where the RRC connection reconfiguration message includes at least a pass link quality threshold.
  • the base station in this step does not need to allocate a dedicated UE for the Remote UE. C-RNTI.
  • Step 5 The Remote UE reports the through link quality measurement report to the base station by means of the Relay UE transit.
  • the pass-through link quality can be reported by the existing RRC message measurement report (MeasurmentReport).
  • the specific reporting frequency can be configured by the base station through the RRC connection reconfiguration message (as in step 4), depending on the network implementation. No specific restrictions are imposed.
  • Step 6a The base station determines, according to the measurement report of the Remote UE, whether the quality of the direct link between the Remote UE and the Relay UE is lower than the pass-through link quality threshold configured in step 4, and if yes, configures a dedicated C for the Remote UE. -RNTI.
  • the pass-through link quality between the Remote UE and the Relay UE is lower than the configured pass-through link quality threshold, and the trigger base station configures the dedicated C-RNTI for the Remote UE.
  • Step 6b the Remote UE determines whether the quality of the through link with the remaining Relay UE is lower than the pass link quality threshold configured in step 4, and if yes, and has received the C-RNTI configured by the base station, the Remote UE initiates The RRC connection with the base station is established, and the data transmission is transferred from the direct link of the Relay UE to the uplink and downlink of the cellular network by using the C-RNTI allocated by the base station, and the subsequent data is directly transmitted and received with the base station.
  • the condition that the Remote UE allows to use the uplink and downlink of the cellular network for communication is that the quality of the through link with the Relay UE is lower than the quality of the through link configured by the base station, and the configuration of the base station is received.
  • C-RNTI these two conditions are indispensable.
  • the specific embodiment is different from the second embodiment in that the third embodiment does not require the Remote UE to report the measurement report of the through link quality to the base station through the Relay UE.
  • Steps 1 to 4 are the same as the second embodiment.
  • the remote UE determines whether the quality of the through link between the remaining and the relay UE is lower than the quality of the through link configured in the step 4, and if yes, reports the through link to the base station through the relay UE transit mode. Interrupt indication message.
  • the remote UE finds that the quality of the direct link is lower than the quality of the pass-through link configured by the base station, and triggers the remote UE to send a direct link pre-interrupt indication message to the base station, where the direct link pre-interrupt indication message is used to notify the base station of the Remote UE.
  • the signal on the through link is weak, the communication with the Relay UE is about to be interrupted, and the coverage of the Relay UE is about to leave.
  • the direct link pre-interrupt indication message may be sent to the base station by using an RRC message, or may be sent to the base station by using a Medium Access Control (MAC) protocol layer control element (Control Element, CE). No specific restrictions are imposed.
  • MAC Medium Access Control
  • the remote UE does not need to perform measurement reporting on the through link to the base station because the direct link pre-interrupt indication message is introduced.
  • Step 6a After receiving the through link pre-interrupt indication message, the base station configures a dedicated C-RNTI for the Remote UE.
  • the base station pre-interrupt indication message triggers the base station to configure a dedicated C-RNTI for the Remote UE.
  • Step 6b The Remote UE receives the C-RNTI configured by the base station, and uses the C-RNTI allocated by the base station to transfer the data transmission from the Relay UE through link to the uplink and downlink of the UE, and directly performs subsequent data transmission and reception with the base station.
  • an embodiment of the present invention provides a terminal.
  • the terminal is mainly include:
  • the communication module 901 is configured to communicate with the network device by using the second terminal as a relay device;
  • the processing module 902 is configured to determine that a pass-through link quality between the terminal and the second terminal is lower than a pass-through link quality threshold, and trigger a data transmission from the terminal to the second terminal The link switches to an uplink and/or downlink communication link between the terminal and the network device.
  • an embodiment of the present invention provides a network device.
  • the network device For a specific implementation of the network device, refer to the related description of the network device in the method embodiment, and details are not repeated herein.
  • the network As shown in FIG. 10, the network is not shown.
  • the equipment mainly includes:
  • the communication module 1001 is configured to communicate with the first terminal by using the second terminal as a relay device.
  • the processing module 1002 is configured to switch the communication module to perform data transmission with the first terminal by using an uplink and/or downlink communication link between the first terminal and the network device, where After determining that the direct link quality between the first terminal and the second terminal is lower than a pass-through link quality threshold, the first terminal triggers data transmission from the first terminal to the second terminal The pass-through link switches to an uplink and/or downlink communication link between the first terminal and the network device.
  • an embodiment of the present invention provides a terminal.
  • the terminal mainly
  • the processor 1101 is configured to receive and transmit data under the control of the processor 1101.
  • the memory 1102 stores a preset program, and the processor 1101 reads the memory 1102. Program, according to the program to perform the following process:
  • the processor is configured to perform the functions of the processing module of the terminal in the above embodiment, and the processor controls the transceiver to perform the functions of the communication module of the terminal in the above embodiment.
  • an embodiment of the present invention provides a network device.
  • the device mainly includes a processor 1201 for receiving and transmitting data under the control of the processor 1201, a preset program stored in the memory 1202, and a processor 1201 reading the memory 1202. In the program, follow the procedure to perform the following process:
  • the transceiver to perform data transmission with the first terminal through an uplink and/or downlink communication link between the first terminal and the network device, wherein the first terminal determines the After the pass-through link quality between the first terminal and the second terminal is lower than the pass-through link quality threshold, triggering to switch data transmission from the direct link between the first terminal and the second terminal to the An uplink and/or downlink communication link between the first terminal and the network device.
  • the processor is configured to perform the functions of the processing module of the network device in the above embodiment, and the processor controls the transceiver to perform the functions of the processing module in the above embodiment.
  • the network device is a base station.
  • the processor, the memory and the transceiver are connected by a bus, and the bus architecture may include any number of interconnected buses and bridges, specifically represented by one or more processors and memories represented by the processor.
  • the various circuits of the memory are linked together.
  • the bus architecture can also link various other circuits such as peripherals, voltage regulators, and power management circuits, which are well known in the art and, therefore, will not be further described herein.
  • the bus interface provides an interface.
  • the transceiver can be a plurality of components, including a transmitter and a receiver, providing means for communicating with various other devices on a transmission medium.
  • the processor is responsible for managing the bus architecture and the usual processing, and the memory can store the data that the processor uses when performing operations.
  • embodiments of the present invention can be provided as a method, system, or computer program product. Accordingly, the present invention may take the form of an entirely hardware embodiment, an entirely software embodiment, or a combination of software and hardware. Moreover, the invention can take the form of a computer program product embodied on one or more computer-usable storage media (including but not limited to disk storage and optical storage, etc.) including computer usable program code.
  • the computer program instructions can also be stored in a computer readable memory that can direct a computer or other programmable data processing device to operate in a particular manner, such that the instructions stored in the computer readable memory produce an article of manufacture comprising the instruction device.
  • the apparatus implements the functions specified in one or more blocks of a flow or a flow and/or block diagram of the flowchart.
  • These computer program instructions can also be loaded onto a computer or other programmable data processing device such that a series of operational steps are performed on a computer or other programmable device to produce computer-implemented processing for execution on a computer or other programmable device.
  • the instructions provide steps for implementing the functions specified in one or more of the flow or in a block or blocks of a flow diagram.

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Abstract

一种通信方法及通信设备，用以实现"UE-网络"中继技术、在尽可能节省Remote UE功耗的前提下，保证Remote UE离开Relay UE覆盖时的业务连续性。方法为：第一终端以第二终端作为中继设备与网络设备通信；所述第一终端确定所述第一终端与所述第二终端之间的直通链路质量低于直通链路质量门限，则触发将数据传输从所述第一终端与所述第二终端之间的直通链路切换至所述第一终端与所述网络设备之间的上行和/或下行通信链路。

Description

通信方法及通信设备 技术领域
本发明涉及通信技术领域，尤其涉及一种通信方法及通信设备。
背景技术
随着智能手表、智能手环、智能眼镜的出现和日益更新，可穿戴设备已经成为全球流行的电子产品。基于可穿戴设备的应用以及面向可穿戴设备的通信技术，业已益成为全球电信行业的研究热点。
作为可穿戴设备的典型应用场景，智能手表、手环、手表等可穿戴设备通常会通过智能手机中转的方式，与蜂窝网络建立无线连接并进行通信，使得用户可以直接通过可穿戴设备上的各类应用(Application，简称APP)，与网络进行各类多媒体业务数据的收发，避免智能手机带来的操作不便、携带不便等问题，方便快捷。
图1给出了可穿戴设备通信的示意图。智能手表、智能眼镜等可穿戴设备通过直通链路(Sidelink)将数据传输给智能手机；之后，智能手机作为中继终端(Relay User Equipment,Relay UE)将该数据通过蜂窝上行链路(Uplink)发送给长期演进(Long Term Evolution，LTE)系统的基站，完成可穿戴数据的发送。基站通过蜂窝下行链路(Downlink)将数据发送给Relay UE，由Relay UE通过直通链路将该数据发送给可穿戴设备，完成可穿戴设备的数据接收。对应于Relay UE，从通信技术的角度，可穿戴设备通常被称为远程终端(Remote User Equipment,Remote UE)。Relay UE和Remote UE之间的直通链路上，通常将采用包括蓝牙、Wifi、LTE D2D(Device-to-Device,设备到设备)等短程通信技术进行数据传输。可穿戴设备通过UE进行中继传输的通信方式，也称为“UE-网络中继”传输(UE-to-Network Relay)。
此外，可穿戴设备通信具有如下两个特点：
第一，低功耗要求：由于智能手环、手表、眼镜等可穿戴设备的体积很小，其电池容量通常十分受限，因此具有很高的省电需求，而UE间的短程通信要比设备与基站间的长距离通信省电。所以可穿戴设备应尽可能使用“UE-网络”的方式，先由Remote UE利用短距离通信技术、将数据通过直通链路传输给Relay UE，再由Relay UE将数据转发给基站，以达到尽可能省电的目的。
第二，业务连续性要求：可穿戴设备最主要的业务类型及应用场景是语音通话，通常对业务的连续性有较高要求。鉴于可穿戴设备可能会由于移出Relay UE的通信范围(也可以为Relay UE的覆盖范围)而中断与Relay UE的连接，从而不得不切换至蜂窝上下行链路直接与基站通信。该过程中，要求可穿戴设备的数据传输尽量不产生中断，以维持业务连续性。
面向可穿戴设备的通信方案一
Remote UE和Relay UE之间的直通链路采用基于wifi的短距离直通技术，而这种“UE-网络”中继传输的方式，即为目前常用的“wifi”热点技术，即：打开智能手机的“wifi热点”功能，可穿戴设备通过wifi将数据传输给wifi热点，再由wifi热点传输给蜂窝基站；或者基站将数据发送给wifi热点，由wifi热点通过wifi将该数据发送给可穿戴设备。图2所示为“UE-网络”中继传输的过程示意图。但是，当Remote UE逐渐远离Relay UE时，wifi信号逐渐减弱，可能移出Relay UE的覆盖范围，导致与Relay UE的通信中断。这时，Remote UE将与基站建立连接，并进一步通过基站的上/下行链路继续数据收发。然而，Remote UE在发现与wifi热点的连接断开之后，才会发起与基站的连接建立，且只有在与基站的连接建立之后，才能通过基站的上/下行链路与基站继续通信，这就导致Remote UE在与基站建立连接的过程中数据传输中断，中断时长有时可高达数秒，严重影响通信性能。
面向可穿戴设备的通信方案二
3GPP在Release-13协议版本中标准化了基于LTE D2D的“UE-网络”中继技术。其中，Relay UE和Remote UE之间的直通链路采用的是基于LTE D2D的短距离通信技术，该直通链路对应的空中接口称为“PC5接口”。具体地，系统在 直通链路上定义若干“资源池”；所谓资源池，是指一组“时-频”资源的集合。Remote UE使用资源池中的资源，将数据发送给Relay UE，由Relay UE通过蜂窝网络的上行链路转发给基站，或者基站通过Relay UE的中转将数据发送给Remote UE。
图3所示为基于LTE D2D的“UE-网络”中继方式示意图，现有基于LTE D2D的“UE-网络”中继方式中，Remote UE根据与基站之间的链路质量，决定数据收发路径。具体地，位于基站覆盖范围外或者覆盖边缘的Remote UE，通常会与Relay UE进行连接，并通过“UE-网络”中继的方式与基站进行数据收发。然而，Remote UE从基站覆盖范围外或者覆盖边缘移动到覆盖范围内的过程中，在具备可接受的蜂窝链路质量(如RSRP/RSRP)的情况下，将与基站建立蜂窝连接，并通过与基站之间的上下行链路进行后续数据收发，终止通过Relay UE进行数据收发，即便其仍处在Relay UE的覆盖范围内。换句话说，现有基于LTE D2D的“UE-网络”中继技术中，Remote UE尽可能采用蜂窝上下行链路进行传输，即：即便Remote UE处于Relay UE的覆盖范围之内，但只要其能能够使用蜂窝上下行链路进行通信，就不会通过Relay UE进行数据中转。然而，Relay UE与基站之间的通信距离，比Relay UE和Reote UE之间的距离远得多，因而传输功耗高。因此，现有基于LTE D2D的“UE-网络”中继技术会导致Remote UE产生较高的传输功耗，尤其不适用于可穿戴设备这类电池容量受限的设备。
因此，现有基于LTE D2D的“UE-网络”中继技术的缺点在于：将会产生导致过高的Remote UE传输功耗，尤其不适用于可穿戴设备这类电池容量受限的设备。
由此可见，如何使得“UE-网络”中继技术、在尽可能节省Remote UE功耗的前提下，保证Remote UE离开Relay UE覆盖时的业务连续性，是需要解决的技术问题。
发明内容
本发明实施例提供一种通信方法及通信设备，用以实现“UE-网络”中继技术、在尽可能节省Remote UE功耗的前提下，保证Remote UE离开Relay UE覆盖时的业务连续性。
本发明实施例提供的具体技术方案如下：
第一方面，本发明实施例提供了一种通信方法，包括：第一终端以第二终端作为中继设备与网络设备通信；所述第一终端确定所述第一终端与所述第二终端之间的直通链路质量低于直通链路质量门限，则触发将数据传输从所述第一终端与所述第二终端之间的直通链路切换至所述第一终端与所述网络设备之间的上行和/或下行通信链路。通过将第一终端与第二终端之间的直通链路质量与直通链路质量门限进行比较，在该直通链路质量低于该直通链路质量门限的情况下，触发将数据传输从该直通链路切换至第一终端与所述网络设备之间的上行和/或下行通信链路，从而能够在第一终端与第二终端之间的通信仍可继续的情况下，将数据传输切换至第一终端与所述网络设备之间的上行和/或下行通信链路上，保证了第一终端与网络设备之间通信的业务连续性，并且尽可能采用中继的方式与网络设备通信，达到了尽量节省第一终端的电量的目的。
可能的实施方式中，所述直通链路质量门限由网络设备配置给所述第一终端，或预配置在所述第一终端中。从而能够为第一终端配置直通链路质量门限。
可能的实施方式中，所述第一终端以第二终端作为中继设备与网络设备通信之前，所述第一终端通过所述第二终端与所述网络设备建立无线资源控制RRC连接。从而能够使得第一终端通过第二终端能够与网络设备进行中继方式的数据收发，而不是采用蜂窝网络的上行或下行链路。
可能的实施方式中，所述第一终端触发将数据传输从所述第一终端与所述第二终端之间的直通链路切换至所述第一终端与所述网络设备之间的上行和/或下行通信链路，包括：所述第一终端触发采用所述第一终端专用的小区无线网络临时标识C-RNTI，将数据传输从所述第一终端与所述第二终端之间 的直通链路切换至所述第一终端与所述网络设备之间的上行和/或下行通信链路。
可能的实施方式中，所述第一终端通过第二终端与网络设备建立无线资源控制RRC连接之后，触发将数据传输从所述第一终端与所述第二终端之间的直通链路切换至所述第一终端与所述网络设备之间的上行和/或下行通信链路之前，所述第一终端通过所述第二终端获取所述网络设备分配给所述第一终端的所述C-RNTI。从而能够为将数据传输从直通链路切换至所述第一终端与所述网络设备之间的上行和/或下行通信链路提供所需参数。
可能的实施方式中，所述第一终端通过所述第二终端获取所述网络设备分配给所述第一终端的所述C-RNTI，包括：所述第一终端通过所述第二终端获取所述网络设备发送的RRC连接重配置消息，其中，所述RRC连接重配置消息中携带分配给所述第一终端的所述C-RNTI。
可能的实施方式中，所述第一终端通过所述第二终端获取所述网络设备分配给所述第一终端的所述C-RNTI之前，所述第一终端通过所述第二终端向所述网络设备发送直通链路预中断指示，所述直通链路预中断指示用于指示所述第一终端与所述第二终端之间的通信即将中断。从而能够通过直通链路预中断指示触发网络设备为第一终端分配所述C-RNTI。
可能的实施方式中，所述第一终端确定所述直通链路质量低于直通链路质量门限之前，所述第一终端通过所述第二终端获取所述网络设备配置的所述直通链路质量门限。
可能的实施方式中，所述第一终端通过所述第二终端与所述网络设备建立无线资源控制RRC连接，包括：所述第一终端向所述第二终端发送RRC连接请求消息，由所述第二终端将所述RRC连接请求消息发送给所述网络设备；所述第一终端接收所述网络设备通过所述第二终端中转发送的RRC连接建立消息；所述第一终端向所述第二终端发送RRC连接建立完成消息，由所述第二终端将所述RRC连接建立完成消息发送给所述网络设备。从而实现了第一终端以第二终端为中继设备与网络设备建立RRC连接。
可能的实施方式中，所述RRC连接请求消息、所述RRC连接建立消息以及所述RRC连接建立完成消息中分别携带所述第一终端的指示信息。从而使得第二终端以及网络设备能够区分来自于第一终端的RRC消息。
第二方面，本发明实施例提供了一种通信方法，包括：网络设备以第二终端作为中继设备与第一终端通信；所述网络设备切换为通过所述第一终端与所述网络设备之间的上行和/或下行通信链路与所述第一终端进行数据传输，其中，由所述第一终端在确定所述第一终端与所述第二终端之间的直通链路质量低于直通链路质量门限后，触发将数据传输从所述第一终端与所述第二终端之间的直通链路切换至所述第一终端与所述网络设备之间的上行和/或下行通信链路。
可能的实施方式中，所述网络设备以第二终端作为中继设备与第一终端通信之前，所述方法还包括：所述网络设备通过所述第二终端与所述第一终端建立无线资源控制RRC连接。
可能的实施方式中，所述网络设备通过所述第二终端与所述第一终端建立无线资源控制RRC连接之后，所述网络设备切换为通过所述第一终端与所述网络设备之间的上行和/或下行通信链路与所述第一终端进行数据传输之前，所述方法还包括：
所述网络设备通过所述第二终端向所述第一终端分配所述第一终端专用的小区无线网络临时标识C-RNTI。
可能的实施方式中，所述网络设备通过所述第二终端向所述第一终端分配所述第一终端专用的小区无线网络临时标识C-RNTI，包括：
所述网络设备通过所述第二终端向所述第一终端发送RRC连接重配置消息，其中，所述RRC连接重配置消息中携带分配给所述第一终端的所述C-RNTI。
可能的实施方式中，所述网络设备通过所述第二终端向所述第一终端分配所述第一终端专用的小区无线网络临时标识C-RNTI之前，所述方法还包括：
所述网络设备通过所述第二终端接收所述第一终端发送的直通链路预中断指示，所述直通链路预中断指示用于指示所述第一终端与所述第二终端之间的通信即将中断。
可能的实施方式中，所述网络设备切换为通过所述第一终端与所述网络设备之间的上行和/或下行通信链路与所述第一终端进行数据传输之前，所述方法还包括：
所述网络设备通过所述第二终端向所述第一终端配置所述直通链路质量门限。
第三方面，本发明实施例提供了一种终端，该终端具有实现上述第一方面以及第二方面的方法实现中的第一终端的功能，所述功能可以通过硬件实现，也可以通过硬件执行相应的软件实现，所述硬件或软件包括一个或多个与上述功能相对应的模块。
第四方面，本发明实施例提供了一种网络设备，该终端具有实现上述第一方面以及第二方面的方法实现中的网络设备的功能，所述功能可以通过硬件实现，也可以通过硬件执行相应的软件实现，所述硬件或软件包括一个或多个与上述功能相对应的模块。
第五方面，本发明实施例提供了一种终端，包括处理器、存储器和收发机，其中，存储器中保存有预设的程序，处理器读取存储器中的程序，按照该程序执行上述第一方面的方法。
第六方面，本发明实施例提供了一种网络设备，包括处理器、存储器和收发机，其中，存储器中保存有预设的程序，处理器读取存储器中的程序，按照该程序执行上述第二方面的方法。
附图说明
图1为现有技术可穿戴设备通信的示意图；
图2为现有技术“UE-网络”中继传输的过程示意图；
图3为现有技术基于LTE D2D的“UE-网络”中继方式示意图；
图4本发明实施例的应用场景示意图；
图5为本发明实施例中通信流程示意图；
图6为本发明实施例中维持业务连续性的流程示意图；
图7为本发明实施例中另一维持业务连续性的流程示意图；
图8为本发明实施例中另一维持业务连续性的流程示意图；
图9为本发明实施例中终端的结构示意图；
图10为本发明实施例中网络设备的结构示意图；
图11为本发明实施例中另一终端的结构示意图；
图12为本发明实施例中另一网络设备的结构示意图。
具体实施方式
为了使本发明的目的、技术方案和优点更加清楚，下面将结合附图对本发明作进一步地详细描述，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。
为了实现“UE-网络”中继技术、在尽可能节省Remote UE功耗的前提下，保证Remote UE离开Relay UE覆盖时的业务连续性，本发明实施例提供了一种通信方法及通信设备。本发明实施例通过在Remote UE即将离开Relay UE的覆盖范围之前与基站直接建立通信连接，以避免通信中断，而在Remote UE位于Relay UE的覆盖范围内，则尽可能通过Relay UE中转的方式，使用“UE-网络”中继技术进行数据收发，以节省传输功耗。
本发明的应用场景如图4所示，该场景主要包括第一终端401、第二终端402以及网络设备403，其中，第一终端在第二终端的覆盖范围内，以第二终端为中继与网络设备通信。本发明实施例基于LTE D2D的“UE-网络”中继技术的基础上进行改进。
以下实施例中，假设第一终端为Remote UE，第二终端为Relay UE。
本发明实施例中，如图5所示，Remote UE与网络设备通信的详细方法流程如下：
步骤501：第一终端以第二终端作为中继设备与网络设备通信。
一个具体实施方式中，所述第一终端以第二终端作为中继设备与网络设备通信之前，所述第一终端通过所述第二终端与所述网络设备建立无线资源控制(Radio Resource Control，RRC)连接。
具体实施中，第一终端与第二终端之间在直通链路(sidelink)上基于LTE D2D技术进行Relay UE发现及连接建立。即第一终端通过第二终端在直通链路上广播的Relay发现消息(Relay Discovery Message)，发现该第一终端周围存在的终端，并且将该周围存在的终端中能够覆盖第一终端的终端作为第二终端；第一终端向第二终端发送直接通信请求，由第二终端根据该直接通信请求对第一终端进行鉴权和安全验证后，在第一终端与第二终端之间的直通链路建立连接，随后第一终端和第二终端即可通过直通链路上建立的连接进行直接数据交互。
具体地，所述第一终端通过所述第二终端与所述网络设备建立RRC连接的具体过程为：第一终端向所述第二终端发送RRC连接请求消息，由所述第二终端将所述RRC连接请求消息发送给所述网络设备；所述第一终端接收所述网络设备通过所述第二终端中转发送的RRC连接建立消息；所述第一终端向所述第二终端发送RRC连接建立完成消息，由所述第二终端将所述RRC连接建立完成消息发送给所述网络设备。其中，所述RRC连接请求消息、所述RRC连接建立消息以及所述RRC连接建立完成消息中分别携带所述第一终端的指示信息。
一个具体实施方式中，第二终端需要区分从第一终端接收到的数据是业务数据还是作为控制信令的RRC消息，具体实现方式为：在RRC消息对应的分组数据汇聚(Packet Data Protocol Convergence)协议层的协议数据单元(Protocol Data Unit)中，采用专用的PDCP SDU Type的取值，使得第二终端能够根据该取值判断相应PDCP PDU中封装的是不是来自于第一终端或网络设备的需要发送给第一终端的RRC消息；或者，对第一终端发送的RRC消息或者第一终端发送给第二终端的RRC消息采用专用的逻辑信道标识 (Logical Channel Identifier，LCID)。此处仅为举例，应用中也可以采用其他方式进行区分，此处不再一一列举。
步骤502：第一终端确定所述第一终端与所述第二终端之间的直通链路质量低于直通链路质量门限，则触发将数据传输从所述第一终端与所述第二终端之间的直通链路切换至所述第一终端与所述网络设备之间的上行和/或下行通信链路。
本发明实施例中，直通链路质量可以采用以下参数中的一种或多种的组合表征：LTE D2D技术中的直通链路参考信号接收功率(Sidelink Reference Signal Received Power,S-RSRP)、Relay发现消息的信号强度等。需要说明的是，此处仅为举例说明，对于LTE D2D技术中所有能够用于表征直通链路的通信质量的参数均可以用作直通链路质量。并且，本发明实施例中不限制直通链路质量的测量方式，具体可以是根据网络设备的配置进行测量，例如，按照配置的测量周期进行周期性测量。
具体实施中，所述直通链路质量门限由网络设备配置给所述第一终端，或预配置在所述第一终端中。具体地，所述第一终端通过所述第二终端获取所述网络设备配置的所述直通链路质量门限。本发明实施例中，通过对直通链路质量门限的合理配置，使得第一终端与第二终端之间的直通链路质量低于该直通链路质量门限时，第一终端与第二终端的通信仍可继续，从而尽量保证第一终端在建立与基站的RRC连接的过程中，仍然可以以第二终端作为中继设备与网络设备进行数据传输，从而保证了第一终端在离开第二终端的覆盖范围时的业务连续性。
具体实施中，所述第一终端触发采用所述第一终端专用的小区无线网络临时标识(Cell Radio Network Temporary Identity，C-RNTI)，将数据传输从所述第一终端与所述第二终端之间的直通链路切换至所述第一终端与所述网络设备之间的上行和/或下行通信链路，与网络设备通过上行和/或下行通信链路进行数据传输。
其中，所述第一终端通过第二终端与网络设备建立无线资源控制RRC连 接之后，第一终端通过所述第二终端获取所述网络设备分配给所述第一终端的所述C-RNTI。
一个具体实施方式中，所述第一终端通过所述第二终端获取所述网络设备发送的RRC连接重配置消息，其中，所述RRC连接重配置消息中携带分配给所述第一终端的所述C-RNTI。
具体地，所述第一终端通过所述第二终端向所述网络设备发送直通链路预中断指示，所述直通链路预中断指示用于指示所述第一终端与所述第二终端之间的通信即将中断；网络设备通过所述第二终端为所述第一终端分配所述C-RNTI。例如，第一终端在直通链路上的信号强度低于预设门限，或者离开第二终端的覆盖范围的情况下，判定第一终端与第二终端之间的通信即将中断。
步骤503：网络设备切换为通过所述第一终端与所述网络设备之间的上行和/或下行通信链路与所述第一终端进行数据传输。
本发明实施例中，第一终端以第二终端为中继设备与网络设备进行数据通信的过程中，若确定第一终端与第二终端之间的直通链路质量低于直通链路质量门限，则触发将数据传输从该直通链路切换至第一终端与网络设备之间的上行和/或下行通信链路，从而能够在尽量节省第一终端的电量的情况下，避免第一终端由于移动性而产生数据传输中断，保证了第一终端的业务连续性。
以下通过三个具体实施例对本发明实施提供的维持业务连续性的过程进行举例说明。
第一具体实施例，如图6所示，维持业务连续性的具体过程如下：
步骤1，Remote UE与Relay UE在直通链路上基于现有的LTE D2D技术进行Relay UE发现及连接建立。
该步骤直接复用现有的基于LTE D2D的“UE-网络”中继技术中的相关机制和流程实现，具体地：Remote UE通过Relay UE在直通链路上广播的Relay发现消息(Relay Discovery Message)，发现周围存在的Relay UE，并且 位于该Relay UE的覆盖范围内；Remote UE向Relay UE发送直接通信请求，并由Relay UE对Remote UE进行鉴权和安全验证，在Remote UE与Relay UE的直接通信链路建立连接后，Remote UE与Relay UE即可进行直接数据交互。
执行该步骤之后，Remote UE即可与Relay UE在直通链路上进行数据收发，进而通过“UE-网络”中继技术实现与基站间的数据传输。
步骤2，Remote UE通过与Relay UE之间的相关信号强度，测量Remote UE与Relay UE之间的直通链路质量。
具体地，直通链路质量有多种表现形式，包括但不限于以下列举的几种，LTE D2D中的直通链路参考信号接收功率(Sidelink Reference Signal Received Power,S-RSRP)强度或Relay发现消息的信号强度。Remote UE通过测量直通链路参考信号接收功率或Relay发现消息的信号强度，获得Remote UE与Relay UE之间的直通链路质量。
可选地，Remote UE周期性地、持续进行直通链路质量的测量。具体的测量周期由基站通过无线资源控制(Radio Resource Control，RRC)重配置消息(RRC Connection Reconfiguration)进行配置，该测量周期取决于网络设备的实现，此处不做具体限制。
步骤3，Remote UE采用“UE-网络”中继技术，通过Relay UE中转的方式，与基站建立RRC连接。
该步骤中，RRC连接建立过程，复用现有LTE系统中的RRC连接建立相关流程和RRC消息，唯一的区别在于，Remote UE通过Relay UE中转的方式与基站进行RRC连接建立相关的RRC消息交互，而不是通过LTE系统的蜂窝网络的上下行链路与基站直接进行RRC消息的交互。
一个具体实施方式中，Remote UE通过直通链路向Relay UE发送RRC连接请求(RRC Connection Request)消息，并由Relay UE通过上行链路将该RRC连接请求消息转发给基站；基站通过下行链路向Relay UE发送RRC连接建立(RRC Connection Setup)消息，由Relay UE将该RRC连接建立消息转发给Remote UE；Remote UE向Relay UE发送RRC连接建立完成(RRC  Connection Setup Complete)消息，由Relay UE将该RRC连接建立完成消息转发给基站，完成Remote UE的RRC连接建立过程。
可选地，Relay UE区分从Remote UE接收到的数据是业务数据还是作为控制信令的RRC消息。具体区分方法为，RRC消息所对应的分组数据汇聚(Packet Data Convergence Protocol，PDCP)协议层的协议数据单元(Protocol Data Unit，PDU)中，采用专用的PDCP SDU Type的取值(例如“111”)，使得Relay UE可以通过该取值，判断PDCP PDU中封装数据来自Remote UE，或判断PDCP PDU中封装数据是基站发送给Remote UE；或者，对Remote UE发送的、或发送给Remote UE的RRC消息，采用专用的逻辑信道标识(Logical Channel Identifier,LCID)进行标识。需要说明的是，此处仅为举例说明，并不用于限制本发明的保护范围。
需要指出的是，RRC连接建立之后，Remote UE只能通过Relay UE与基站进行基于“UE-网络”中继的数据收发，而不是与基站直接进行蜂窝上下行链路的通信。
步骤4，Remote UE的RRC连接建立之后，基站通过Relay UE中转的方式，向Remote UE发送RRC连接重配置(RRC Connection Reconfiguration)消息，该RRC连接重配置消息中至少包括：直通链路质量门限，以及Remote UE专用的C-RNTI。
同样，基站通过Relay UE中转的方式，将所述RRC连接重配置消息，发送给Remote UE。其中，Relay UE可以采用步骤3中所列举的方法，判断从基站接收到的是RRC连接重配置消息，而不是业务数据，并且将该RRC连接重配置消息转发给Remote UE。
其中，RRC连接重配置消息中至少包含直通链路质量门限和C-RNTI，可选地，该RRC连接重配置消息也可以包含其他现有LTE系统中RRC连接重配置消息中的其他信息。
其中，直通链路所使用的具体参量与步骤2相对应(如，S-RSRP强度、Relay发现消息的信号强度，或其他)。具体地，直通链路质量门限的具体取 值取决于基站的具体实现，此处不做具体限定。
步骤5，Remote UE判断所测量的直通链路质量是否低于基站所配置的直通链路质量门限，如果是，则Remote UE发起与基站之间的RRC连接建立过程，并使用基站所分配的C-RNTI，将数据传输从Relay UE直通链路转移至蜂窝网络的上下行链路，直接与基站进行后续的数据收发。
该步骤中，如果Remote UE测得的直通链路质量，低于基站配置的直通链路质量门限，则触发Remote UE与基站建立RRC连接，并将业务数据从正在使用的Relay链路(“UE-网络”中继)切换至蜂窝网络的上下行链路上，与基站直接进行后续的数据传输。
特别地，直通链路质量低于基站配置的直通链路质量门限，表示Remote UE信号变弱，可能即将离开Relay UE的覆盖范围，从而触发Remote UE与基站之间的RRC连接建立过程，并将数据转移到蜂窝网络的上下行链路上传输。
该具体实施例中，通过对Remote UE与Relay UE之间的直通链路质量门限的合理配置，使得Remote UE在与Relay UE之间的直通链路质量不低于直通链路质量门限值时，与Relay UE进行通信，并且使得Remote UE在与Relay UE之间的直通链路质量低于直通链路质量门限值，且通过Relay UE进行基于“UE-网络”中继的数据传输未中断的情况下，建立与基站之间的RRC连接，从而尽量保证Remote UE在建立与基站间的RRC连接过程中，仍然可以通过Relay UE进行基于“UE-网络”中继的数据传输，保证了在Remote UE离开Remote UE时的业务连续性。
第二具体实施例，如图7所示，维持业务连续性的具体过程如下：
步骤1～步骤3与第一具体实施例相同。
步骤4，Remote UE的RRC连接建立之后，基站通过Relay UE中转的方式，向Remote UE发送RRC连接重配置消息，该RRC连接重配置消息中至少包括直通链路质量门限。
与实施例一的步骤4相比，该步骤中基站无需分配专用于Remote UE的 C-RNTI。
步骤5，Remote UE通过Relay UE中转的方式，向基站上报直通链路质量测量报告。
其中，直通链路质量可以通过现有的RRC消息测量报告(MeasurmentReport)进行上报，具体的上报频率，可以由基站通过RRC连接重配置消息进行配置(如步骤4中)，取决于网络实现，此处不做具体限制。
步骤6a，基站根据Remote UE的测量上报，判断Remote UE与Relay UE之间的直通链路质量是否低于步骤4中所配置的直通链路质量门限，如果是，则为Remote UE配置专用的C-RNTI。
即，该具体实施例中，将Remote UE与Relay UE之间的直通链路质量低于所配置的直通链路质量门限作为触发条件，触发基站为Remote UE配置专用的C-RNTI。
步骤6b，Remote UE判断与其余Relay UE之间的直通链路的质量是否低于步骤4中配置的直通链路质量门限，如果是，并且已经收到了基站配置的C-RNTI，则Remote UE发起与基站之间的RRC连接建立，并使用基站所分配的C-RNTI，将数据传输从Relay UE的直通链路转移至蜂窝网络的上下行链路，直接与基站进行后续的数据收发。
该具体实施例中，Remote UE允许使用蜂窝网络的上下行链路进行通信的条件是：与Relay UE之间的直通链路质量低于基站配置的直通链路质量门限，并且收到了基站配置的C-RNTI，这两个条件缺一不可。
第三具体实施例，如图8所示，维持业务连续性的具体过程如下：
该具体实施例与第二具体实施例的不同之处在于，第三具体实施例不需要Remote UE通过Relay UE向基站上报直通链路质量的测量报告。
步骤1～4与第二具体实施例相同。
步骤5，Remote UE判断其余与Relay UE之间的直通链路的质量是否低于步骤4中配置的直通链路质量门限，如果是，则通过Relay UE中转的方式，向基站上报直通链路预中断指示消息。
Remote UE发现直通链路质量低于基站所配置的直通链路质量门限，将触发该Remote UE向基站发送直通链路预中断指示消息，该直通链路预中断指示消息用于向基站通知Remote UE在直通链路上的信号较弱、与Relay UE的通信即将中断，即将离开Relay UE的覆盖范围。
可选地，该直通链路预中断指示消息可以通过RRC消息发送给基站，也可通过媒体介入控制层控制(Medium Accesss Control，MAC)协议层控制元素(Control Element，CE)发送给基站，此处不做具体限制。
该具体实施例中，由于引入了直通链路预中断指示消息，Remote UE无需向基站进行直通链路的测量上报。
步骤6a、基站在收到直通链路预中断指示消息后，为Remote UE配置专用的C-RNTI。
该具体实施例中，由直通链路预中断指示消息触发基站为Remote UE配置专用的C-RNTI。
步骤6b、Remote UE接收基站配置的C-RNTI，使用基站所分配的C-RNTI，将数据传输从Relay UE直通链路转移至蜂窝上下行链路，直接与基站进行后续的数据收发。
基于同一发明构思，本发明实施例提供了一种终端，该终端的具体实施可参见方法实施例部分关于第一终端的相关描述，重复之处不再赘述，如图9所示，该终端主要包括：
通信模块901，用于以第二终端作为中继设备与网络设备通信；
处理模块902，用于确定所述终端与所述第二终端之间的直通链路质量低于直通链路质量门限，则触发将数据传输从所述终端与所述第二终端之间的直通链路切换至所述终端与所述网络设备之间的上行和/或下行通信链路。
基于同一发明构思，本发明实施例提供了一种网络设备，该网络设备的具体实施可参见方法实施例部分关于网络设备的相关描述，重复之处不再赘述，如图10所示，该网络设备主要包括：
通信模块1001，用于以第二终端作为中继设备与第一终端通信；
处理模块1002，用于将所述通信模块切换为通过所述第一终端与所述网络设备之间的上行和/或下行通信链路与所述第一终端进行数据传输，其中，由所述第一终端在确定所述第一终端与所述第二终端之间的直通链路质量低于直通链路质量门限后，触发将数据传输从所述第一终端与所述第二终端之间的直通链路切换至所述第一终端与所述网络设备之间的上行和/或下行通信链路。
基于同一发明构思，本发明实施例提供了一种终端，该终端的具体实施可参见方法实施例部分关于第一终端的相关描述，重复之处不再赘述，如图11所示，该终端主要包括处理器1101、存储器1102和收发机1103，其中，收发机1103用于在处理器1101的控制下接收和发送数据，存储器1102中保存有预设的程序，处理器1101读取存储器1102中的程序，按照该程序执行以下过程：
指示收发机以第二终端作为中继设备与网络设备通信；
确定所述终端与所述第二终端之间的直通链路质量低于直通链路质量门限，则触发将数据传输从所述终端与所述第二终端之间的直通链路切换至所述终端与所述网络设备之间的上行和/或下行通信链路。
具体地，处理器用于执行以上实施例中终端的处理模块的功能，并且处理器控制收发机执行以上实施例中终端的通信模块的功能。
基于同一发明构思，本发明实施例提供了一种网络设备，该网络设备的具体实施可参见方法实施例部分关于网络设备的相关描述，重复之处不再赘述，如图12所示，该网络设备主要包括处理器1201、存储器1202和收发机1203，其中，收发机1203用于在处理器1201的控制下接收和发送数据，存储器1202中保存有预设的程序，处理器1201读取存储器1202中的程序，按照该程序执行以下过程：
指示收发机以第二终端作为中继设备与第一终端通信；
将收发机切换为通过所述第一终端与所述网络设备之间的上行和/或下行通信链路与所述第一终端进行数据传输，其中，由所述第一终端在确定所述 第一终端与所述第二终端之间的直通链路质量低于直通链路质量门限后，触发将数据传输从所述第一终端与所述第二终端之间的直通链路切换至所述第一终端与所述网络设备之间的上行和/或下行通信链路。
具体地，处理器用于执行以上实施例中网络设备的处理模块的功能，处理器控制收发机执行以上实施例中处理模块的功能。
一个具体实施方式中，该网络设备为基站。
其中，图11至图12中，处理器、存储器和收发机之间通过总线连接，总线架构可以包括任意数量的互联的总线和桥，具体由处理器代表的一个或多个处理器和存储器代表的存储器的各种电路链接在一起。总线架构还可以将诸如外围设备、稳压器和功率管理电路等之类的各种其他电路链接在一起，这些都是本领域所公知的，因此，本文不再对其进行进一步描述。总线接口提供接口。收发机可以是多个元件，即包括发送机和接收机，提供用于在传输介质上与各种其他装置通信的单元。处理器负责管理总线架构和通常的处理，存储器可以存储处理器在执行操作时所使用的数据。
本领域内的技术人员应明白，本发明的实施例可提供为方法、系统、或计算机程序产品。因此，本发明可采用完全硬件实施例、完全软件实施例、或结合软件和硬件方面的实施例的形式。而且，本发明可采用在一个或多个其中包含有计算机可用程序代码的计算机可用存储介质(包括但不限于磁盘存储器和光学存储器等)上实施的计算机程序产品的形式。
本发明是参照根据本发明实施例的方法、设备(系统)、和计算机程序产品的流程图和/或方框图来描述的。应理解可由计算机程序指令实现流程图和/或方框图中的每一流程和/或方框、以及流程图和/或方框图中的流程和/或方框的结合。可提供这些计算机程序指令到通用计算机、专用计算机、嵌入式处理机或其他可编程数据处理设备的处理器以产生一个机器，使得通过计算机或其他可编程数据处理设备的处理器执行的指令产生用于实现在流程图一个流程或多个流程和/或方框图一个方框或多个方框中指定的功能的装置。
这些计算机程序指令也可存储在能引导计算机或其他可编程数据处理设备以特定方式工作的计算机可读存储器中，使得存储在该计算机可读存储器中的指令产生包括指令装置的制造品，该指令装置实现在流程图一个流程或多个流程和/或方框图一个方框或多个方框中指定的功能。
这些计算机程序指令也可装载到计算机或其他可编程数据处理设备上，使得在计算机或其他可编程设备上执行一系列操作步骤以产生计算机实现的处理，从而在计算机或其他可编程设备上执行的指令提供用于实现在流程图一个流程或多个流程和/或方框图一个方框或多个方框中指定的功能的步骤。
显然，本领域的技术人员可以对本发明进行各种改动和变型而不脱离本发明的精神和范围。这样，倘若本发明的这些修改和变型属于本发明权利要求及其等同技术的范围之内，则本发明也意图包含这些改动和变型在内。

Claims (30)

  1. 一种通信方法，其特征在于，包括：
    第一终端以第二终端作为中继设备与网络设备通信；
    所述第一终端确定所述第一终端与所述第二终端之间的直通链路质量低于直通链路质量门限，则触发将数据传输从所述第一终端与所述第二终端之间的直通链路切换至所述第一终端与所述网络设备之间的上行和/或下行通信链路。
  2. 如权利要求1所述方法，其特征在于，所述直通链路质量门限由网络设备配置给所述第一终端，或预配置在所述第一终端中。
  3. 如权利要求1或2所述方法，其特征在于，所述第一终端以第二终端作为中继设备与网络设备通信之前，所述方法还包括：
    所述第一终端通过所述第二终端与所述网络设备建立无线资源控制RRC连接。
  4. 如权利要求3所述的方法，其特征在于，所述第一终端触发将数据传输从所述第一终端与所述第二终端之间的直通链路切换至所述第一终端与所述网络设备之间的上行和/或下行通信链路，包括：
    所述第一终端触发采用所述第一终端专用的小区无线网络临时标识C-RNTI，将数据传输从所述第一终端与所述第二终端之间的直通链路切换至所述第一终端与所述网络设备之间的上行和/或下行通信链路。
  5. 如权利要求4所述的方法，其特征在于，所述第一终端通过第二终端与网络设备建立无线资源控制RRC连接之后，触发将数据传输从所述第一终端与所述第二终端之间的直通链路切换至所述第一终端与所述网络设备之间的上行和/或下行通信链路之前，所述方法还包括：
    所述第一终端通过所述第二终端获取所述网络设备分配给所述第一终端的所述C-RNTI。
  6. 如权利要求5所述的方法，其特征在于，所述第一终端通过所述第二 终端获取所述网络设备分配给所述第一终端的所述C-RNTI，包括：
    所述第一终端通过所述第二终端获取所述网络设备发送的RRC连接重配置消息，其中，所述RRC连接重配置消息中携带分配给所述第一终端的所述C-RNTI。
  7. 如权利要求5或6所述的方法，其特征在于，所述第一终端通过所述第二终端获取所述网络设备分配给所述第一终端的所述C-RNTI之前，所述方法还包括：
    所述第一终端通过所述第二终端向所述网络设备发送直通链路预中断指示，所述直通链路预中断指示用于指示所述第一终端与所述第二终端之间的通信即将中断。
  8. 如权利要求1-7任一项所述的方法，其特征在于，所述第一终端确定所述直通链路质量低于直通链路质量门限之前，所述方法还包括：
    所述第一终端通过所述第二终端获取所述网络设备配置的所述直通链路质量门限。
  9. 如权利要求3-7任一项所述的方法，其特征在于，所述第一终端通过所述第二终端与所述网络设备建立无线资源控制RRC连接，包括：
    所述第一终端向所述第二终端发送RRC连接请求消息，由所述第二终端将所述RRC连接请求消息发送给所述网络设备；
    所述第一终端接收所述网络设备通过所述第二终端中转发送的RRC连接建立消息；
    所述第一终端向所述第二终端发送RRC连接建立完成消息，由所述第二终端将所述RRC连接建立完成消息发送给所述网络设备。
  10. 如权利要求9所述的方法，其特征在于，所述RRC连接请求消息、所述RRC连接建立消息以及所述RRC连接建立完成消息中分别携带所述第一终端的指示信息。
  11. 一种通信方法，其特征在于，包括：
    网络设备以第二终端作为中继设备与第一终端通信；
    所述网络设备切换为通过所述第一终端与所述网络设备之间的上行和/或下行通信链路与所述第一终端进行数据传输，其中，由所述第一终端在确定所述第一终端与所述第二终端之间的直通链路质量低于直通链路质量门限后，触发将数据传输从所述第一终端与所述第二终端之间的直通链路切换至所述第一终端与所述网络设备之间的上行和/或下行通信链路。
  12. 如权利要求11所述的方法，其特征在于，所述网络设备以第二终端作为中继设备与第一终端通信之前，所述方法还包括：
    所述网络设备通过所述第二终端与所述第一终端建立无线资源控制RRC连接。
  13. 如权利要求12所述的方法，其特征在于，所述网络设备通过所述第二终端与所述第一终端建立无线资源控制RRC连接之后，所述网络设备切换为通过所述第一终端与所述网络设备之间的上行和/或下行通信链路与所述第一终端进行数据传输之前，所述方法还包括：
    所述网络设备通过所述第二终端向所述第一终端分配所述第一终端专用的小区无线网络临时标识C-RNTI。
  14. 如权利要求13所述的方法，其特征在于，所述网络设备通过所述第二终端向所述第一终端分配所述第一终端专用的小区无线网络临时标识C-RNTI，包括：
    所述网络设备通过所述第二终端向所述第一终端发送RRC连接重配置消息，其中，所述RRC连接重配置消息中携带分配给所述第一终端的所述C-RNTI。
  15. 如权利要求13或14所述的方法，其特征在于，所述网络设备通过所述第二终端向所述第一终端分配所述第一终端专用的小区无线网络临时标识C-RNTI之前，所述方法还包括：
    所述网络设备通过所述第二终端接收所述第一终端发送的直通链路预中断指示，所述直通链路预中断指示用于指示所述第一终端与所述第二终端之间的通信即将中断。
  16. 如权利要求11-15任一项所述的方法，其特征在于，所述网络设备切换为通过所述第一终端与所述网络设备之间的上行和/或下行通信链路与所述第一终端进行数据传输之前，所述方法还包括：
    所述网络设备通过所述第二终端向所述第一终端配置所述直通链路质量门限。
  17. 一种终端，其特征至于，包括：
    通信模块，用于以第二终端作为中继设备与网络设备通信；
    处理模块，用于确定所述终端与所述第二终端之间的直通链路质量低于直通链路质量门限，则触发将数据传输从所述终端与所述第二终端之间的直通链路切换至所述终端与所述网络设备之间的上行和/或下行通信链路。
  18. 如权利要求17所述的终端，其特征在于，所述通信模块还用于：
    以第二终端作为中继设备与网络设备通信之前，通过所述第二终端与所述网络设备建立无线资源控制RRC连接。
  19. 如权利要求18所述的终端，其特征在于，所述处理模块具体用于：
    触发采用所述终端专用的小区无线网络临时标识C-RNTI，将数据传输从所述终端与所述第二终端之间的直通链路切换至所述终端与所述网络设备之间的上行和/或下行通信链路。
  20. 如权利要求19所述的终端，其特征在于，所述通信模块还用于：
    通过所述第二终端获取所述网络设备分配给所述终端的所述C-RNTI。
  21. 如权利要求20所述的终端，其特征在于，所述通信模块具体用于：
    通过所述第二终端获取所述网络设备发送的RRC连接重配置消息，其中，所述RRC连接重配置消息中携带分配给所述终端的所述C-RNTI。
  22. 如权利要求20或21所述的终端，其特征在于，所述通信模块还用于：
    通过所述第二终端获取所述网络设备分配给所述终端的所述C-RNTI之前，通过所述第二终端向所述网络设备发送直通链路预中断指示，所述直通链路预中断指示用于指示所述终端与所述第二终端之间的通信即将中断。
  23. 如权利要求17-22任一项所述的终端，其特征在于，所述通信模块还用于：
    通过所述第二终端获取所述网络设备配置的所述直通链路质量门限。
  24. 如权利要求18-22任一项所述的终端，其特征在于，所述通信模块具体用于：
    向所述第二终端发送RRC连接请求消息，由所述第二终端将所述RRC连接请求消息发送给所述网络设备；
    接收所述网络设备通过所述第二终端中转发送的RRC连接建立消息；
    向所述第二终端发送RRC连接建立完成消息，由所述第二终端将所述RRC连接建立完成消息发送给所述网络设备。
  25. 一种网络设备，其特征在于，包括：
    通信模块，用于以第二终端作为中继设备与第一终端通信；
    处理模块，用于将所述通信模块切换为通过所述第一终端与所述网络设备之间的上行和/或下行通信链路与所述第一终端进行数据传输，其中，由所述第一终端在确定所述第一终端与所述第二终端之间的直通链路质量低于直通链路质量门限后，触发将数据传输从所述第一终端与所述第二终端之间的直通链路切换至所述第一终端与所述网络设备之间的上行和/或下行通信链路。
  26. 如权利要求25所述的网络设备，其特征在于，所述通信模块还用于：
    以第二终端作为中继设备与第一终端通信之前，通过所述第二终端与所述第一终端建立无线资源控制RRC连接。
  27. 如权利要求26所述的网络设备，其特征在于，所述通信模块还用于：
    通过所述第二终端与所述第一终端建立无线资源控制RRC连接之后，切换为通过所述第一终端与所述网络设备之间的上行和/或下行通信链路与所述第一终端进行数据传输之前，向所述第一终端分配所述第一终端专用的小区无线网络临时标识C-RNTI。
  28. 如权利要求27所述的网络设备，其特征在于，所述通信模块具体用 于：
    通过所述第二终端向所述第一终端发送RRC连接重配置消息，其中，所述RRC连接重配置消息中携带分配给所述第一终端的所述C-RNTI。
  29. 如权利要求27或28所述的网络设备，其特征在于，所述通信模块还用于：
    通过所述第二终端向所述第一终端分配所述第一终端专用的小区无线网络临时标识C-RNTI之前，通过所述第二终端接收所述第一终端发送的直通链路预中断指示，所述直通链路预中断指示用于指示所述第一终端与所述第二终端之间的通信即将中断。
  30. 如权利要求25-29任一项所述的网络设备，其特征在于，所述通信模块还用于：通过所述第二终端向所述第一终端配置所述直通链路质量门限。
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