WO2018177345A1 - 实现wlan和lte网络自动切换的方法及通信终端 - Google Patents

实现wlan和lte网络自动切换的方法及通信终端 Download PDF

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Publication number
WO2018177345A1
WO2018177345A1 PCT/CN2018/081005 CN2018081005W WO2018177345A1 WO 2018177345 A1 WO2018177345 A1 WO 2018177345A1 CN 2018081005 W CN2018081005 W CN 2018081005W WO 2018177345 A1 WO2018177345 A1 WO 2018177345A1
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Prior art keywords
wlan
signal measurement
lte network
measurement parameter
network
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PCT/CN2018/081005
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English (en)
French (fr)
Inventor
钟彩锦
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捷开通讯(深圳)有限公司
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Priority to US16/497,794 priority Critical patent/US11122484B2/en
Publication of WO2018177345A1 publication Critical patent/WO2018177345A1/zh

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Classifications

    • 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
    • H04W36/0072—Transmission or use of information for re-establishing the radio link of resource information of target access point
    • 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
    • H04W36/0083—Determination of parameters used for hand-off, e.g. generation or modification of neighbour cell lists
    • H04W36/00837—Determination of triggering parameters for hand-off
    • 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
    • H04W36/0083—Determination of parameters used for hand-off, e.g. generation or modification of neighbour cell lists
    • H04W36/0085—Hand-off measurements
    • 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
    • H04W36/144—Reselecting a network or an air interface over a different radio air interface technology
    • H04W36/1446—Reselecting a network or an air interface over a different radio air interface technology wherein at least one of the networks is unlicensed
    • 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
    • H04W36/0077—Transmission or use of information for re-establishing the radio link of access information of target access point
    • 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
    • H04W36/249—Reselection being triggered by specific parameters according to timing information
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04W—WIRELESS COMMUNICATION NETWORKS
    • H04W84/00—Network topologies
    • H04W84/02—Hierarchically pre-organised networks, e.g. paging networks, cellular networks, WLAN [Wireless Local Area Network] or WLL [Wireless Local Loop]
    • H04W84/10—Small scale networks; Flat hierarchical networks
    • H04W84/12—WLAN [Wireless Local Area Networks]

Definitions

  • the present invention relates to the field of mobile communications technologies, and in particular, to implementing a WLAN (Wireless Local Area) Networks, WLAN and LTE (Long Term Evolution) network automatic switching methods and communication terminals.
  • WLAN Wireless Local Area
  • LTE Long Term Evolution
  • the IMS IP Multimedia Subsystem, The IP Multimedia Subsystem
  • the quality of communication services in LTE networks in closed environments is often poor, and network optimization techniques in these places are difficult and costly.
  • the WLAN terminal can be connected to the mobile Internet through the LTE wireless router to achieve coverage of the WLAN.
  • the current WLAN and LTE network switching generally only depends on the preset information of the network priority.
  • the IMS preferentially carries the IMS communication service in advance. If the communication terminal enters the outdoor open area from the closed environment, the network condition of the LTE network is better. WLAN, at this time, still carries the communication service by the WLAN with poor signal quality, which not only affects the communication service quality, but also increases the network connection time, thereby reducing the network connection efficiency.
  • the present invention provides a method and a communication terminal for implementing automatic handover of a WLAN and an LTE network, which can automatically select a bearer IMS communication service with the best network condition in the WLAN and the LTE network, ensure communication service quality, and improve network connection efficiency.
  • the reporting period of the WLAN is smaller than the reporting period of the LTE network
  • the network priority is used to identify a network that is preferentially used to carry the communication service when the WLAN and the LTE network coexist, and the preset information of the network priority includes the first preset information, And one of the preset information and the third preset information, where the first preset information is a bearer communication service with the best signal quality in the WLAN and the LTE network, and the second preset information is preferentially
  • the WLAN carries the communication service
  • the third preset information is preferentially carried by the LTE network to carry the communication service;
  • the preset information of the network priority is the first preset information, comparing the signal measurement parameters of the WLAN and the LTE network; when the signal measurement parameter of the WLAN is greater than the signal measurement parameter of the LTE network, generating a switching instruction for carrying a communication service by the WLAN; when the signal measurement parameter of the WLAN is smaller than a signal measurement parameter of the LTE network, generating a handover instruction for carrying the communication service by the LTE network;
  • the preset information of the network priority is the second preset information, comparing the signal measurement parameter of the WLAN with a first preset threshold, where the signal measurement parameter of the WLAN is greater than or equal to the first
  • a switching instruction for continuing the communication service by the WLAN is generated; when the signal measurement parameter of the WLAN is smaller than the first preset threshold, the signal measurement parameters of the WLAN and the LTE network are compared;
  • the signal measurement parameter of the WLAN is greater than or equal to the signal measurement parameter of the LTE network, generating a handover instruction that continues to be carried by the WLAN; and when the signal measurement parameter of the WLAN is smaller than the signal measurement parameter of the LTE network, generating Replacing the handover command of the WLAN bearer communication service by the LTE network;
  • the preset information of the network priority is the third preset information, comparing the signal measurement parameter of the LTE network with a second preset threshold; the signal measurement parameter of the LTE network is greater than or equal to the And generating, by the second preset threshold, a handover instruction that continues to be carried by the LTE network; and when the signal measurement parameter of the LTE network is smaller than the second preset threshold, performing signal measurement parameters of the WLAN and the LTE network Comparing; when the signal measurement parameter of the LTE network is greater than or equal to the signal measurement parameter of the WLAN, generating a handover instruction that continues to carry the communication service by the LTE network; the signal measurement parameter of the LTE network is smaller than the signal of the WLAN When the parameters are measured, a handover instruction is generated by the WLAN to carry the communication service.
  • a handover operation is performed according to the signal measurement parameters and preset information of the network priority to select one bearer communication service from the WLAN and the LTE network.
  • a communication terminal for implementing automatic switching connection between a WLAN and an LTE network includes a transceiver, a memory, and a processor connected to the transceiver and the memory, where
  • the transceiver is configured to receive signal measurement parameters reported by the WLAN and the LTE network for identifying signal quality;
  • the memory is configured to store preset information of a network priority, where the network priority is used to identify a network that is preferentially used to carry a communication service when a WLAN and an LTE network coexist;
  • the processor is configured to perform a handover operation according to the signal measurement parameter and preset information of a network priority to select a bearer communication service from the WLAN and the LTE network.
  • the present invention also uses signal measurement parameters of WLAN and LTE networks as a basis for network handover, that is, introduces network conditions as a selection WLAN and LTE network bearer communication service (for example, IMS).
  • the communication service enables automatic selection of a bearer communication service with the best network condition in the WLAN and LTE networks, thereby ensuring communication service quality and improving network connection efficiency.
  • FIG. 1 is a schematic flowchart of a method for implementing automatic handover between a WLAN and an LTE network according to a first embodiment of the present invention
  • FIG. 2 is a schematic flowchart of measurement parameters of a signal reported by a WLAN and an LTE network
  • FIG. 3 is a schematic flowchart of a method for implementing automatic handover between a WLAN and an LTE network according to a second embodiment of the present invention
  • FIG. 4 is a schematic flowchart of a method for implementing automatic handover of a WLAN and an LTE network according to a third embodiment of the present invention
  • FIG. 5 is a schematic flowchart of a method for implementing automatic handover of a WLAN and an LTE network according to a fourth embodiment of the present invention
  • FIG. 6 is a schematic flowchart of a method for implementing automatic handover of a WLAN and an LTE network according to a fifth embodiment of the present invention
  • FIG. 7 is a schematic structural diagram of a communication terminal that implements an automatic handover connection between a WLAN and an LTE network according to an embodiment of the present invention.
  • FIG. 1 is a method for implementing automatic handover of a WLAN and an LTE network according to a first embodiment of the present invention.
  • the method may include steps S11 to S13.
  • S11 Receive signal measurement parameters for identifying signal quality reported by the WLAN and the LTE network respectively.
  • the WLAN and LTE networks can periodically report their respective signal measurement parameters. Since the coverage of the WLAN is generally smaller than the coverage of the LTE network in the actual application scenario, the communication terminal can easily enter and leave the coverage of the WLAN, that is, the probability that the communication terminal is in the WLAN is generally smaller than the probability of being in the LTE network. Therefore, this embodiment may The reporting period of the WLAN is set to be smaller than the reporting period of the LTE network.
  • the LTE network when the registration status of the IMS service management module is successfully registered by the WLAN and the LTE network, the LTE network sends a signal measurement parameter to the IMS service management module according to the reporting period T1.
  • the WLAN sends a signal measurement parameter to the IMS service management module according to the reporting period T2, where T2 is less than T1.
  • the WLAN and the LTE network stop reporting the respective signal measurement parameters.
  • the signal measurement parameters are used to identify the signal quality of each network. For example, the higher the signal measurement parameter, the better the signal quality and the better the communication quality. On this basis, different types of networks can select different types of signal measurement parameters, as long as the signal quality can be identified.
  • the signal measurement parameter reported by the LTE network may be RSRP (Reference Signal Receiving Power, Reference signal received power) and RSRQ (Reference Signal Receiving Quality, The reference signal receiving quality parameter), and the signal measurement parameter reported by the WLAN may include RSSI (Received Signal Strength Indicator, Receive signal strength indication parameter).
  • S12 Acquire preset information of a network priority, where the network priority is used to identify a network that is preferentially used to carry a communication service when the WLAN and the LTE network coexist.
  • S13 Perform a handover operation according to the signal measurement parameter and preset information of the network priority to select a bearer communication service from the WLAN and the LTE network.
  • the signal measurement parameters of the WLAN and the LTE network are also used as the basis for network handover, that is, the network condition is introduced as the WLAN and LTE network bearer communication service (for example, the IMS communication service). ), enabling automatic selection of a bearer communication service with the best network conditions in WLAN and LTE networks to ensure communication service quality and improve network connection efficiency.
  • the following uses the preset information of the three network priorities shown in FIG. 3 to FIG. 5 as an example to illustrate the principle and process of performing handover in the present invention.
  • the method may include the following steps S31 to S35. .
  • S31 Receive signal measurement parameters for identifying signal quality reported by the WLAN and the LTE network respectively.
  • S32 Acquire preset information of a network priority, where the preset information of the network priority is a bearer communication service with the best signal quality in the WLAN and the LTE network.
  • the network priority is not set, and only the network with the best signal quality is selected according to the signal measurement parameter to replace the network bearer communication service with poor signal quality.
  • the present embodiment needs to convert two types of signal measurement parameters into the same unit level.
  • the Q_LTE is defined as the signal quality of the LTE network
  • the Q_WLAN is the signal quality of the WLAN
  • the M_LTE is the signal measurement parameter reported by the LTE network
  • the M_WLAN is the signal measurement parameter reported by the WLAN
  • the signal measurement parameter in the WLAN is smaller than the signal measurement parameter of the LTE network, that is, Q_WLAN ⁇
  • the communication service is carried by the LTE network. If the network currently carrying the communication service is a WLAN, a network switching operation is performed. If the network currently carrying the communication service is an LTE network, there is no need to perform a network switching operation.
  • the signal measurement parameter in the WLAN is larger than the signal measurement parameter of the LTE network, that is, Q_WLAN >
  • Q_LTE the signal measurement parameter of the LTE network
  • a handover instruction for carrying a communication service by the WLAN is generated. If the network currently carrying the communication service is a WLAN, the network switching operation is not performed. If the network currently carrying the communication service is an LTE network, a network switching operation needs to be performed.
  • the preset information in the network priority is the second preset information, that is, the user pre-sets that when the WLAN and the LTE network coexist, the WLAN carries the communication service preferentially, the method may include the following step S41. ⁇ S47.
  • S41 Receive signal measurement parameters for identifying signal quality reported by the WLAN and the LTE network respectively.
  • S42 Acquire preset information of the network priority, where the preset information of the network priority is preferentially carried by the WLAN when the WLAN and the LTE network coexist.
  • the first preset threshold may be understood as a preset threshold for identifying a good and poor signal quality of the WLAN, and the threshold may be customized by the user as needed.
  • the signal measurement parameter of the WLAN is greater than or equal to the first preset threshold, that is, Q_WLAN ⁇ the first preset threshold, indicating that the signal quality of the WLAN is good, and a good communication service can be provided. Since the communication service is currently carried by the WLAN, there is no need to perform a network switching operation.
  • S45 Compare signal measurement parameters of the WLAN and the LTE network when the signal measurement parameter of the WLAN is less than the first preset threshold.
  • the signal measurement parameter of the WLAN is smaller than the first preset threshold, that is, Q_WLAN ⁇ When the first preset threshold is used, it indicates that the signal quality of the WLAN is poor, and there is a risk of dropping the network.
  • the embodiment In order to avoid the poor signal quality of the LTE network at this time, and the WLAN network takes over the WLAN to further affect the communication service quality, the embodiment also needs to perform steps S46 and S47 to compare the signal quality of the WLAN and the LTE network to select the most signal quality. A good bearer communication service.
  • the signal measurement parameter in the WLAN is greater than or equal to the signal measurement parameter of the LTE network, that is, Q_WLAN ⁇
  • Q_LTE the signal measurement parameter of the LTE network
  • the signal measurement parameter in the WLAN is smaller than the signal measurement parameter of the LTE network, that is, Q_WLAN ⁇
  • Q_LTE the signal measurement parameter of the LTE network
  • the preset information in the network priority is the third preset information, that is, the user presets that when the WLAN and the LTE network coexist, the communication service is preferentially carried by the LTE network, the method may include the following steps. S51 ⁇ S57.
  • S51 Receive signal measurement parameters for identifying signal quality reported by the WLAN and the LTE network, respectively.
  • S52 Acquire preset information of the network priority, where the preset information of the network priority is that the communication service is preferentially carried by the LTE network when the WLAN and the LTE network coexist.
  • the second preset threshold may be understood as a preset threshold for identifying a good and poor signal quality of the LTE network, and the threshold may be customized by the user as needed.
  • the signal measurement parameter of the LTE network is greater than or equal to the second preset threshold, that is, Q_LTE ⁇ the second preset threshold, it indicates that the signal quality of the LTE network is good, and a good communication service can be provided. Since the communication service is currently carried by the TE network, there is no need to perform a network switching operation.
  • S55 Compare signal measurement parameters of the WLAN and the LTE network when the signal measurement parameter of the LTE network is less than the second preset threshold.
  • the signal measurement parameter in the LTE network is smaller than the second preset threshold, that is, Q_LTE ⁇ When the second preset threshold is used, it indicates that the signal quality of the LTE network is poor, and there is a risk of dropping the network.
  • the embodiment In order to avoid the poor signal quality of the WLAN at this time, and the WLAN to take over the LTE network further affects the communication service quality, the embodiment also needs to perform steps S56 and S57 to compare the signal quality of the WLAN and the LTE network to select the best signal quality.
  • One of the bearer communication services is used.
  • the signal measurement parameter in the LTE network is greater than or equal to the signal measurement parameter of the WLAN network, that is, Q_LTE ⁇
  • Q_WLAN the signal measurement parameter of the WLAN network
  • the signal measurement parameter in the LTE network is smaller than the signal measurement parameter of the WLAN, that is, Q_LTE ⁇
  • Q_WLAN When Q_WLAN, it indicates that the communication service should be carried by the WLAN.
  • network switching operations need to be performed.
  • the present invention can determine whether to perform the network switching operation according to the handover instruction in the embodiments of FIG. 3 to FIG. 5 through the ping-pong switching algorithm. As shown in FIG. 6, the method includes:
  • S61 Receive signal measurement parameters for identifying signal quality reported by the WLAN and the LTE network respectively.
  • S62 Acquire preset information of a network priority, where the network priority is used to identify a network that is preferentially used to carry a communication service when the WLAN and the LTE network coexist.
  • S63 Generate a switching instruction according to the signal measurement parameter and preset information of the network priority.
  • the switching instruction of this embodiment includes the switching instruction generated in the embodiment of FIGS. 3 to 5.
  • the effective time represents a duration of a trigger condition for generating the handover instruction
  • the trigger condition includes a comparison result of signal measurement parameters of the WLAN and the LTE network, a comparison result of the signal measurement parameter of the WLAN and the first preset threshold, and A comparison result of a signal measurement parameter of the LTE network with a second preset threshold.
  • the signal measurement parameter of the WLAN when the signal measurement parameter of the WLAN is greater than or equal to the first preset threshold, a switching instruction for continuing the communication service by the WLAN is generated, and if the switching instruction is generated and after 10 seconds, the WLAN is If the signal measurement parameter is smaller than the first preset threshold and the signal measurement parameter of the WLAN is smaller than the signal measurement parameter of the LTE network, the WLAN bearer communication service should be replaced by the LTE network, and the handover instruction is changed, and the handover command by the WLAN bearer communication service is invalid. . Then, 10 seconds is the effective time.
  • a switch in a certain direction needs to be performed, for example, when the LTE network needs to be switched to the WLAN, a timer of 10 seconds is started, and if the switch in the same direction occurs during the running, the The second switching, if the timer occurs in a different direction after the end of the operation, the switching is performed.
  • the preset time of the ping-pong switching algorithm is a preset threshold value for preventing frequent switching of the WLAN and the LTE network due to factors such as network signal jitter, and the threshold value can be customized by the user as needed.
  • step S65 If the effective time of the switching instruction reaches the preset time of the ping-pong switching algorithm, indicating that the switching instruction can be executed, step S65 is performed. If the valid time of the switching instruction does not reach the preset time of the ping-pong switching algorithm, indicating that the switching instruction does not need to be executed, step S66 is performed.
  • S65 The switching instruction is valid, and the switching operation is performed according to the switching instruction.
  • S66 The handover instruction is invalid, and the network currently carrying the communication service continues to carry the communication service.
  • the embodiment After the handover operation is completed, the embodiment performs corresponding registration according to the switched network type. If the communication service is carried by the LTE network after the handover, the communication terminal initiates a PDN to the LTE network (Public Data Network, public data network) connection, and SIP (Session Initiation Protocol, After the session initiation protocol is registered, the LTE network is accessed. If the communication service is carried by the WLAN after the handover, the communication terminal initiates an ePDG (evolved Packet Data) to the WLAN. Gateway, Evolved Packet Data Gateway) connects, then initiates a PDN connection, and accesses the WLAN after SIP registration is completed.
  • ePDG evolved Packet Data
  • FIGS. 1 to 6 can be combined with each other, and the above functions can be stored in an electronic device readable storage if implemented in the form of software functions and sold or used as a stand-alone product.
  • the present invention also provides a storage device storing program data, the program data can be executed to implement the method of the above embodiment, and the storage device can be, for example, a USB flash drive, an optical disk, a server, or the like.
  • various embodiments of the present invention may be embodied in the form of a software product that includes instructions for causing a smart terminal to perform all or part of the steps of the methods described in the various embodiments.
  • the communication terminal 70 can include a transceiver 71, a memory 72, and a processor 73 that can be coupled to the transceiver 71 and memory 72 via a communication bus 74.
  • the transceiver 71 is configured to receive signal measurement parameters reported by the WLAN and the LTE network for identifying signal quality.
  • the memory 72 is configured to store preset information of a network priority, where the network priority is used to identify a network that is preferentially used to carry communication services when the WLAN and the LTE network coexist.
  • the processor 73 is configured to perform a handover operation according to the signal measurement parameter and preset information of the network priority to select one bearer communication service from the WLAN and the LTE network.
  • the preset information of the network priority may include one of the first preset information, the second preset information, and the third preset information.
  • the first preset information is a bearer communication service with the best signal quality in the WLAN and the LTE network
  • the second preset information is preferentially carried by the WLAN bearer communication service
  • the third preset information is preferentially carried by the LTE network to carry the communication service.
  • the processor 73 is configured to: compare the signal measurement parameters of the WLAN and the LTE network. When a signal measurement parameter of the WLAN is greater than a signal measurement parameter of the LTE network, generating a handover instruction by the WLAN bearer communication service; when the signal measurement parameter of the WLAN is smaller than a signal measurement parameter of the LTE network, generating a communication carried by the LTE network Switching instructions for the service.
  • the processor 73 is configured to compare the signal measurement parameter of the WLAN with a first preset threshold. When the signal measurement parameter of the WLAN is greater than or equal to the first preset threshold, generating a handover instruction that continues to be carried by the WLAN; and when the signal measurement parameter of the WLAN is less than the first preset threshold, The signal measurement parameters of the WLAN and LTE networks are compared. When the signal measurement parameter of the WLAN is greater than or equal to the signal measurement parameter of the LTE network, generating a handover instruction that continues to be carried by the WLAN; and when the signal measurement parameter of the WLAN is smaller than the signal measurement parameter of the LTE network And generating a handover instruction that replaces the WLAN bearer communication service by the LTE network.
  • the processor 73 is configured to compare the signal measurement parameter of the LTE network with a second preset threshold. And generating, when the signal measurement parameter of the LTE network is greater than or equal to the second preset threshold, a handover instruction that continues to be carried by the LTE network; and the signal measurement parameter of the LTE network is smaller than the second preset threshold
  • the signal measurement parameters of the WLAN and LTE networks are compared. And generating, when the signal measurement parameter of the LTE network is greater than or equal to a signal measurement parameter of the WLAN, a handover instruction that continues to carry a communication service by the LTE network; and the signal measurement parameter of the LTE network is smaller than the signal measurement parameter of the WLAN. At this time, a handover instruction for carrying the communication service by the WLAN is generated.
  • the processor 73 is further configured to determine whether the effective time of the handover instruction reaches a preset time of the ping-pong handover algorithm, in order to prevent the communication service from frequently switching between the WLAN and the LTE network due to network signal jitter. If so, the processor 73 determines that the switching instruction is valid and performs a switching operation according to the switching instruction; if not, the processor 73 determines that the switching instruction is invalid and continues to carry the communication service by the network currently carrying the communication service.
  • the above-described structural elements of the communication terminal 70 of the present embodiment correspond to the method of the above-described respective embodiments, and have the same technical effects.

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Abstract

本发明公开一种实现WLAN和LTE网络自动切换的方法及通信终端。所述方法包括：接收WLAN和LTE网络上报的信号测量参数；获取网络优先级的预置信息，所述网络优先级用于标识在WLAN和LTE网络共存时优先用于承载通信服务的网络；根据信号测量参数以及网络优先级的预置信息执行切换操作。

Description

实现WLAN和LTE网络自动切换的方法及通信终端
【技术领域】
本发明涉及移动通信技术领域，具体涉及一种实现WLAN（Wireless Local Area Networks, 无线局域网络）和LTE（Long Term Evolution, 长期演进）网络自动切换的方法及通信终端。
【背景技术】
随着LTE网络在全球范围内的覆盖越来越完善，其承载的IMS（IP Multimedia Subsystem, IP多媒体子系统）通信服务也随之迅猛发展。但是LTE网络在地下室、地铁、高楼大厦等封闭环境中的通信服务质量往往较差，并且这些地方的网络优化技术难度很大，成本高昂。由于WLAN在封闭环境中的覆盖已经比较完善且成本非常低廉，当前可以通过LTE无线路由器将WLAN终端接入移动互联网以实现WLAN的覆盖。但是，当前WLAN和LTE网络的切换一般只依赖于网络优先级的预置信息，例如预先设置由WLAN优先承载IMS通信服务，如果通信终端由封闭环境进入室外开阔地带，LTE网络的网络状况优于WLAN的，此时仍然由信号质量较差的WLAN承载通信服务，不仅会影响通信服务质量，而且会增加网络连接时间，从而降低网络连接效率。
【发明内容】
鉴于此，本发明提供一种实现WLAN和LTE网络自动切换的方法及通信终端，能够自动选择WLAN和LTE网络中网络状况最好的一个承载IMS通信服务，确保通信服务质量，提高网络连接效率。
本发明一实施例的实现WLAN和LTE网络自动切换的方法，包括：
周期性接收WLAN和LTE网络上报的用于标识信号质量的信号测量参数，所述WLAN的上报周期小于LTE网络的上报周期；
获取网络优先级的预置信息，所述网络优先级用于标识在WLAN和LTE网络共存时优先用于承载通信服务的网络，所述网络优先级的预置信息包括第一预置信息、第二预置信息和第三预置信息中的一个，所述第一预置信息为由所述WLAN和LTE网络中信号质量最好的一个承载通信服务，所述第二预置信息为优先由WLAN承载通信服务，所述第三预置信息为优先由LTE网络承载通信服务；
在所述网络优先级的预置信息为第一预置信息时，将所述WLAN和LTE网络的信号测量参数进行比较；在所述WLAN的信号测量参数大于LTE网络的信号测量参数时，产生由WLAN承载通信服务的切换指令；在所述WLAN的信号测量参数小于LTE网络的信号测量参数时，产生由LTE网络承载通信服务的切换指令；
在所述网络优先级的预置信息为第二预置信息时，将所述WLAN的信号测量参数与第一预设阈值进行比较，在所述WLAN的信号测量参数大于或等于所述第一预设阈值时，产生继续由WLAN承载通信服务的切换指令；在所述WLAN的信号测量参数小于所述第一预设阈值时，将所述WLAN和LTE网络的信号测量参数进行比较；在所述WLAN的信号测量参数大于或等于所述LTE网络的信号测量参数时，产生继续由WLAN承载通信服务的切换指令；在所述WLAN的信号测量参数小于所述LTE网络的信号测量参数时，产生由LTE网络接替WLAN承载通信服务的切换指令；
在所述网络优先级的预置信息为第三预置信息时，将所述LTE网络的信号测量参数与第二预设阈值进行比较；在所述LTE网络的信号测量参数大于或等于所述第二预设阈值时，产生继续由LTE网络承载通信服务的切换指令；在所述LTE网络的信号测量参数小于所述第二预设阈值时，将所述WLAN和LTE网络的信号测量参数进行比较；在所述LTE网络的信号测量参数大于或等于所述WLAN的信号测量参数时，产生继续由LTE网络承载通信服务的切换指令；在所述LTE网络的信号测量参数小于所述WLAN的信号测量参数时，产生由WLAN承载通信服务的切换指令。
本发明一实施例的实现WLAN和LTE网络自动切换的方法，包括：
接收WLAN和LTE网络上报的用于标识信号质量的信号测量参数；
获取网络优先级的预置信息，所述网络优先级用于标识在WLAN和LTE网络共存时优先用于承载通信服务的网络；
根据所述信号测量参数以及网络优先级的预置信息执行切换操作，以从WLAN和LTE网络中选择一个承载通信服务。
本发明一实施例的实现WLAN和LTE网络自动切换连接的通信终端，包括收发器、存储器及与收发器和存储器连接的处理器，其中，
所述收发器用于接收WLAN和LTE网络上报的用于标识信号质量的信号测量参数；
所述存储器用于存储网络优先级的预置信息，所述网络优先级用于标识在WLAN和LTE网络共存时优先用于承载通信服务的网络；
所述处理器用于根据所述信号测量参数以及网络优先级的预置信息执行切换操作，以从WLAN和LTE网络中选择一个承载通信服务。
有益效果：本发明在网络优先级的预置信息的基础上，还通过WLAN和LTE网络的信号测量参数作为网络切换的依据，即引入了网络状况作为选择WLAN和LTE网络承载通信服务（例如IMS通信服务），使得能够自动选择WLAN和LTE网络中网络状况最好的一个承载通信服务，从而确保通信服务质量，提高网络连接效率。
【附图说明】
图1是本发明第一实施例的实现WLAN和LTE网络自动切换的方法的流程示意图；
图2是WLAN和LTE网络上报信号测量参数的流程示意图；
图3是本发明第二实施例的实现WLAN和LTE网络自动切换的方法的流程示意图；
图4是本发明第三实施例的实现WLAN和LTE网络自动切换的方法的流程示意图；
图5是本发明第四实施例的实现WLAN和LTE网络自动切换的方法的流程示意图；
图6是本发明第五实施例的实现WLAN和LTE网络自动切换的方法的流程示意图；
图7是本发明一实施例的实现WLAN和LTE网络自动切换连接的通信终端的结构示意图。
【具体实施方式】
下面将结合本发明实施例中的附图，对本发明所提供的各个示例性的实施例的技术方案进行清楚、完整地描述。在不冲突的情况下，下述各个实施例以及实施例中的特征可以相互组合。
请参阅图1，为本发明第一实施例的实现WLAN和LTE网络自动切换的方法。所述方法可以包括步骤S11~S13。
S11：接收WLAN和LTE网络分别上报的用于标识信号质量的信号测量参数。
WLAN和LTE网络可以周期性的上报各自的信号测量参数。由于在实际应用场景中WLAN的覆盖范围通常小于LTE网络的覆盖范围，通信终端容易进入和离开WLAN的覆盖范围，即通信终端处于WLAN的概率通常小于处于LTE网络的概率，因此，本实施例可以设置WLAN的上报周期小于LTE网络的上报周期。
结合图2所示，以IMS通信服务为例，当WLAN和LTE网络接收到IMS服务管理模块的注册状态为注册成功时，LTE网络会按照上报周期T1向IMS服务管理模块发送信号测量参数，而WLAN会按照上报周期T2向IMS服务管理模块发送信号测量参数，其中T2小于T1。当WLAN和LTE网络接收到IMS服务管理模块的注册状态为注销成功时，WLAN和LTE网络则停止上报各自的信号测量参数。
信号测量参数用于标识各个网络的信号质量，例如信号测量参数越高，表示信号质量越好，通信质量越好。在此基础上，不同类型的网络可以选取不同类型的信号测量参数，只要能够标识信号质量即可。例如， LTE网络上报的信号测量参数可以为RSRP（Reference Signal Receiving Power, 参考信号接收功率）和RSRQ（Reference Signal Receiving Quality, 参考信号接收质量参数），而WLAN上报的信号测量参数可以包括RSSI（Received Signal Strength Indicator, 接收信号强度指示参数）。
S12：获取网络优先级的预置信息，所述网络优先级用于标识在WLAN和LTE网络共存时优先用于承载通信服务的网络。
S13：根据所述信号测量参数以及网络优先级的预置信息执行切换操作，以从WLAN和LTE网络中选择一个承载通信服务。
本实施例在网络优先级的预置信息的基础上，还通过WLAN和LTE网络的信号测量参数作为网络切换的依据，即引入了网络状况作为选择WLAN和LTE网络承载通信服务（例如IMS通信服务），使得能够自动选择WLAN和LTE网络中网络状况最好的一个承载通信服务，以确保通信服务质量，提高网络连接效率。下面以图3~图5所示的三种网络优先级的预置信息为例阐述本发明执行切换的原理及过程。
请参阅图3所示，在网络优先级的预置信息为第一预置信息，即由WLAN和LTE网络中信号质量最好的一个承载通信服务时，所述方法可以包括如下步骤S31~S35。
S31：接收WLAN和LTE网络分别上报的用于标识信号质量的信号测量参数。
S32：获取网络优先级的预置信息，所述网络优先级的预置信息为由WLAN和LTE网络中信号质量最好的一个承载通信服务。
S33：将WLAN和LTE网络的信号测量参数进行比较。
S34：在WLAN的信号测量参数大于LTE网络的信号测量参数时，产生由WLAN承载通信服务的切换指令。
S35：在WLAN的信号测量参数小于LTE网络的信号测量参数时，产生由LTE网络承载通信服务的切换指令。
本实施例相当于未设置网络优先级，仅根据信号测量参数选取信号质量最好的网络接替信号质量较差的网络承载通信服务。
对于WLAN和LTE网络上报的信号测量参数的类型不同的情况，为了实现比较，本实施例需要将两种类型的信号测量参数转变为具有相同单位级。例如，定义Q_LTE为LTE网络信号质量、Q_WLAN为WLAN的信号质量，定义M_LTE为LTE网络上报的信号测量参数、M_WLAN为WLAN上报的信号测量参数，如果Q_LTE = M_LTE，则Q_WLAN = M_WLAN +C +Offset，其中C为表示不同单位级差值的常量，Offset为自定义偏移值。也就是说，以LTE网络的信号测量参数的单位级标识信号质量，需要引入C和Offset这两个常量对WLAN的信号测量参数进行转换，使得转换后两种类型参数的单位级相同。
在WLAN的信号测量参数小于LTE网络的信号测量参数，即Q_WLAN < Q_LTE时，由LTE网络承载通信服务。如果当前承载通信服务的网络为WLAN，则执行网络切换操作。如果当前承载通信服务的网络为LTE网络，则不需要执行网络切换操作。
在WLAN的信号测量参数大于LTE网络的信号测量参数，即Q_WLAN > Q_LTE时，产生由WLAN承载通信服务的切换指令。如果当前承载通信服务的网络为WLAN，则不执行网络切换操作。如果当前承载通信服务的网络为LTE网络，则需要执行网络切换操作。
请参阅图4所示，在网络优先级的预置信息为第二预置信息，即用户预先设定当WLAN和LTE网络共存时优先由WLAN承载通信服务时，所述方法可以包括如下步骤S41~S47。
S41：接收WLAN和LTE网络分别上报的用于标识信号质量的信号测量参数。
S42：获取网络优先级的预置信息，所述网络优先级的预置信息为当WLAN和LTE网络共存时优先由WLAN承载通信服务。
S43：将WLAN的信号测量参数与第一预设阈值进行比较。
所述第一预设阈值可以理解为预先设置的用于标识WLAN的信号质量良好和较差的门限值，该门限值可由用户根据需要自定义。
S44：在WLAN的信号测量参数大于或等于第一预设阈值时，产生继续由WLAN承载通信服务的切换指令。
在WLAN的信号测量参数大于或等于第一预设阈值，即Q_WLAN≥第一预设阈值时，表示WLAN的信号质量良好，能够提供良好的通信服务。鉴于当前由WLAN承载通信服务，故不需要执行网络切换操作。
S45：在WLAN的信号测量参数小于第一预设阈值时，将WLAN和LTE网络的信号测量参数进行比较。
在WLAN的信号测量参数小于第一预设阈值，即Q_WLAN <第一预设阈值时，表示WLAN的信号质量较差，有掉网的风险。为了避免此时LTE网络的信号质量较差，而由LTE网络接替WLAN更加影响通信服务质量，本实施例还需要执行步骤S46和S47，通过比较WLAN和LTE网络的信号质量，以选取信号质量最好的一个承载通信服务。
S46：在WLAN的信号测量参数大于或等于LTE网络的信号测量参数时，产生继续由WLAN承载通信服务的切换指令。
在WLAN的信号测量参数大于或等于LTE网络的信号测量参数，即Q_WLAN ≥ Q_LTE时，表示应该由WLAN承载通信服务。鉴于当前由WLAN承载通信服务，故不需要执行网络切换操作。
S47：在WLAN的信号测量参数小于LTE网络的信号测量参数时，产生由LTE网络接替WLAN承载通信服务的切换指令。
在WLAN的信号测量参数小于LTE网络的信号测量参数，即Q_WLAN < Q_LTE时，表示应该由LTE网络承载通信服务。鉴于当前由WLAN承载通信服务，因此需要执行网络切换操作。
请参阅图5所示，在网络优先级的预置信息为第三预置信息，即用户预先设定当WLAN和LTE网络共存时优先由LTE网络承载通信服务时，所述方法可以包括如下步骤S51~S57。
S51：接收WLAN和LTE网络分别上报的用于标识信号质量的信号测量参数。
S52：获取网络优先级的预置信息，所述网络优先级的预置信息为当WLAN和LTE网络共存时优先由LTE网络承载通信服务。
S53：将LTE网络的信号测量参数与第二预设阈值进行比较。
所述第二预设阈值可以理解为预先设置的用于标识LTE网络的信号质量良好和较差的门限值，该门限值可由用户根据需要自定义。
S54：在LTE网络的信号测量参数大于或等于第二预设阈值时，产生继续由LTE网络承载通信服务的切换指令。
在LTE网络的信号测量参数大于或等于第二预设阈值，即Q_LTE≥第二预设阈值时，表示LTE网络的信号质量良好，能够提供良好的通信服务。鉴于当前由TE网络承载通信服务，故不需要执行网络切换操作。
S55：在LTE网络的信号测量参数小于第二预设阈值时，将WLAN和LTE网络的信号测量参数进行比较。
在LTE网络的信号测量参数小于第二预设阈值，即Q_LTE <第二预设阈值时，表示LTE网络的信号质量较差，有掉网的风险。为了避免此时WLAN的信号质量较差，而由WLAN接替LTE网络更加影响通信服务质量，本实施例还需要执行步骤S56和S57，通过比较WLAN和LTE网络的信号质量，以选取信号质量最好的一个承载通信服务。
S56：在LTE网络的信号测量参数大于或等于WLAN的信号测量参数时，产生继续由LTE网络承载通信服务的切换指令。
在LTE网络的信号测量参数大于或等于WLAN网络的信号测量参数，即Q_LTE ≥ Q_WLAN时，表示应该由LTE网络承载通信服务。鉴于当前由LTE网络承载通信服务，故不需要执行网络切换操作。
S57：在LTE网络的信号测量参数小于WLAN的信号测量参数时，产生由WLAN承载通信服务的切换指令。
在LTE网络的信号测量参数小于WLAN的信号测量参数，即Q_LTE < Q_WLAN时，表示应该由WLAN承载通信服务。鉴于当前由LTE网络承载通信服务，因此需要执行网络切换操作。
为了防止因网络信号抖动导致通信服务在WLAN和LTE网络之间频繁切换，本发明可以通过乒乓切换算法判断是否根据图3~图5实施例中的切换指令执行网络切换操作。如图6所示，所述方法包括：
S61：接收WLAN和LTE网络分别上报的用于标识信号质量的信号测量参数。
S62：获取网络优先级的预置信息，所述网络优先级用于标识在WLAN和LTE网络共存时优先用于承载通信服务的网络。
S63：根据信号测量参数以及网络优先级的预置信息产生切换指令。
本实施例的切换指令包括图3~图5实施例中产生的切换指令。
S64：判断切换指令的有效时间是否达到乒乓切换算法的预设时间。
所述有效时间表示产生所述切换指令的触发条件的持续时间，所述触发条件包括WLAN和LTE网络的信号测量参数的比较结果、WLAN的信号测量参数与第一预设阈值的比较结果、以及LTE网络的信号测量参数与第二预设阈值的比较结果。
以图4所示实施例为例，在WLAN的信号测量参数大于或等于第一预设阈值时，产生继续由WLAN承载通信服务的切换指令，如果该切换指令产生且经过10秒后，WLAN的信号测量参数小于第一预设阈值且WLAN的信号测量参数小于LTE网络的信号测量参数，则应该由LTE网络接替WLAN承载通信服务，切换指令发生了改变，至此由WLAN承载通信服务的切换指令无效。则，10秒即为所述有效时间。
在本实施例中，当需要发生某一方向的切换，例如需要将LTE网络切换为WLAN时，开启一10秒的定时器，如果该定时器在运行过程中同一方向的切换发生，则忽略该次切换，如果该定时器在运行结束后不同一方向的切换发生，则进行切换。
乒乓切换算法的预设时间是预先设置的为了防止因网络信号抖动等因素导致WLAN和LTE网络频繁切换的门限值，该门限值可由用户根据需要自定义。
如果切换指令的有效时间达到乒乓切换算法的预设时间，表示可以执行切换指令，则执行步骤S65。如果切换指令的有效时间未达到乒乓切换算法的预设时间，表示不需要执行切换指令，则执行步骤S66。
S65：所述切换指令有效，并根据切换指令执行切换操作。
S66：所述切换指令无效，并由当前承载通信服务的网络继续承载通信服务。
在切换操作完成后，本实施例根据切换后的网络类型进行对应的注册。如果切换后由LTE网络承载通信服务，则通信终端向LTE网络发起PDN（Public Data Network, 公用数据网）连接，并在完成SIP（Session Initiation Protocol, 会话初始协议）注册之后，接入LTE网络。如果切换后由WLAN承载通信服务，则通信终端向WLAN发起ePDG （evolved Packet Data Gateway, 演进分组数据网关）连接，而后发起PDN连接，并在完成SIP注册之后，接入WLAN。
应该理解到，上述图1~图6的各个实施例之间可以相互结合，并且上述功能如果以软件功能的形式实现并作为独立的产品销售或使用时，可存储在一个电子设备可读取存储介质中，即，本发明还提供一种存储有程序数据的存储装置，所述程序数据能够被执行以实现上述实施例的方法，该存储装置可以为如U盘、光盘、服务器等。也就是说，本发明的各个实施例可以以软件产品的形式体现出来，其包括若干指令用以使得一台智能终端执行各个实施例所述方法的全部或部分步骤。
请参阅图7，为本发明一实施例的实现WLAN和LTE网络自动切换连接的通信终端。所述通信终端70可以包括收发器71、存储器72以及处理器73，所述处理器73可以通过通信总线74连接所述收发器71及存储器72。
收发器71用于接收WLAN和LTE网络上报的用于标识信号质量的信号测量参数。
存储器72用于存储网络优先级的预置信息，所述网络优先级用于标识在WLAN和LTE网络共存时优先用于承载通信服务的网络。
处理器73用于根据所述信号测量参数以及网络优先级的预置信息执行切换操作，以从WLAN和LTE网络中选择一个承载通信服务。
其中，所述网络优先级的预置信息可以包括第一预置信息、第二预置信息和第三预置信息中的一个。第一预置信息为由WLAN和LTE网络中信号质量最好的一个承载通信服务，第二预置信息为优先由WLAN承载通信服务，第三预置信息为优先由LTE网络承载通信服务。
在网络优先级的预置信息为第一预置信息时，所述处理器73用于：将所述WLAN和LTE网络的信号测量参数进行比较。在所述WLAN的信号测量参数大于LTE网络的信号测量参数时，产生由WLAN承载通信服务的切换指令；在所述WLAN的信号测量参数小于LTE网络的信号测量参数时，产生由LTE网络承载通信服务的切换指令。
在网络优先级的预置信息为第二预置信息时，所述处理器73用于：将所述WLAN的信号测量参数与第一预设阈值进行比较。在所述WLAN的信号测量参数大于或等于所述第一预设阈值时，产生继续由WLAN承载通信服务的切换指令；在所述WLAN的信号测量参数小于所述第一预设阈值时，将所述WLAN和LTE网络的信号测量参数进行比较。在所述WLAN的信号测量参数大于或等于所述LTE网络的信号测量参数时，产生继续由WLAN承载通信服务的切换指令；在所述WLAN的信号测量参数小于所述LTE网络的信号测量参数时，产生由LTE网络接替WLAN承载通信服务的切换指令。
在网络优先级的预置信息为第三预置信息时，所述处理器73用于：将所述LTE网络的信号测量参数与第二预设阈值进行比较。在所述LTE网络的信号测量参数大于或等于所述第二预设阈值时，产生继续由LTE网络承载通信服务的切换指令；在所述LTE网络的信号测量参数小于所述第二预设阈值时，将所述WLAN和LTE网络的信号测量参数进行比较。在所述LTE网络的信号测量参数大于或等于所述WLAN的信号测量参数时，产生继续由LTE网络承载通信服务的切换指令；在所述LTE网络的信号测量参数小于所述WLAN的信号测量参数时，产生由WLAN承载通信服务的切换指令。
为了防止因网络信号抖动导致通信服务在WLAN和LTE网络之间频繁切换，所述处理器73还用于判断所述切换指令的有效时间是否达到乒乓切换算法的预设时间。若达到，则处理器73判定所述切换指令有效，并根据切换指令执行切换操作；若未达到，则处理器73判定所述切换指令无效，并由当前承载通信服务的网络继续承载通信服务。
本实施例的通信终端70的上述结构元件对应执行上述各个实施例的方法，具有与其相同的技术效果。
需要说明，以上所述仅为本发明的实施例，并非因此限制本发明的专利范围，凡是利用本发明说明书及附图内容所作的等效结构或等效流程变换，例如各实施例之间技术特征的相互结合，或直接或间接运用在其他相关的技术领域，均同理包括在本发明的专利保护范围内。

Claims (18)

  1. 一种实现无线局域网络WLAN和长期演进LTE网络自动切换的方法，其中，所述方法包括：
    周期性接收WLAN和LTE网络上报的用于标识信号质量的信号测量参数，所述WLAN的上报周期小于LTE网络的上报周期；
    获取网络优先级的预置信息，所述网络优先级用于标识在WLAN和LTE网络共存时优先用于承载通信服务的网络，所述网络优先级的预置信息包括第一预置信息、第二预置信息和第三预置信息中的一个，所述第一预置信息为由所述WLAN和LTE网络中信号质量最好的一个承载通信服务，所述第二预置信息为优先由WLAN承载通信服务，所述第三预置信息为优先由LTE网络承载通信服务；
    在所述网络优先级的预置信息为第一预置信息时，将所述WLAN和LTE网络的信号测量参数进行比较；在所述WLAN的信号测量参数大于LTE网络的信号测量参数时，产生由WLAN承载通信服务的切换指令；在所述WLAN的信号测量参数小于LTE网络的信号测量参数时，产生由LTE网络承载通信服务的切换指令；
    在所述网络优先级的预置信息为第二预置信息时，将所述WLAN的信号测量参数与第一预设阈值进行比较，在所述WLAN的信号测量参数大于或等于所述第一预设阈值时，产生继续由WLAN承载通信服务的切换指令；在所述WLAN的信号测量参数小于所述第一预设阈值时，将所述WLAN和LTE网络的信号测量参数进行比较；在所述WLAN的信号测量参数大于或等于所述LTE网络的信号测量参数时，产生继续由WLAN承载通信服务的切换指令；在所述WLAN的信号测量参数小于所述LTE网络的信号测量参数时，产生由LTE网络接替WLAN承载通信服务的切换指令；
    在所述网络优先级的预置信息为第三预置信息时，将所述LTE网络的信号测量参数与第二预设阈值进行比较；在所述LTE网络的信号测量参数大于或等于所述第二预设阈值时，产生继续由LTE网络承载通信服务的切换指令；在所述LTE网络的信号测量参数小于所述第二预设阈值时，将所述WLAN和LTE网络的信号测量参数进行比较；在所述LTE网络的信号测量参数大于或等于所述WLAN的信号测量参数时，产生继续由LTE网络承载通信服务的切换指令；在所述LTE网络的信号测量参数小于所述WLAN的信号测量参数时，产生由WLAN承载通信服务的切换指令。
  2. 根据权利要求1所述的方法，其中，在产生所述切换指令的步骤之后，所述方法还包括：
    判断所述切换指令的有效时间是否达到乒乓切换算法的预设时间；
    若达到，则判定所述切换指令有效，并根据切换指令执行切换操作；
    若未达到，则判定所述切换指令无效，并由当前承载通信服务的网络继续承载通信服务。
  3. 根据权利要求1所述的方法，其中，所述LTE网络上报的信号测量参数包括参考信号接收功率RSRP和参考信号接收质量参数RSRQ中的至少一个，所述WLAN上报的信号测量参数包括接收信号强度指示参数RSSI。
  4. 根据权利要求3所述的方法，其中，所述将所述WLAN和LTE网络的信号测量参数进行比较的步骤之前，所述方法包括：
    将所述WLAN和LTE网络的信号测量参数转变为具有相同单位级。
  5. 一种实现无线局域网络WLAN和长期演进LTE网络自动切换的方法，其中，所述方法包括：
    接收WLAN和LTE网络上报的用于标识信号质量的信号测量参数；
    获取网络优先级的预置信息，所述网络优先级用于标识在WLAN和LTE网络共存时优先用于承载通信服务的网络；
    根据所述信号测量参数以及网络优先级的预置信息执行切换操作，以从所述WLAN和LTE网络中选择一个承载通信服务。
  6. 根据权利要求5所述的方法，其中，所述网络优先级的预置信息包括第一预置信息、第二预置信息和第三预置信息中的一个，所述第一预置信息为由所述WLAN和LTE网络中信号质量最好的一个承载通信服务，所述第二预置信息为优先由WLAN承载通信服务，所述第三预置信息为优先由LTE网络承载通信服务。
  7. 根据权利要求6所述的方法，其中，
    在所述网络优先级的预置信息为第一预置信息时，所述根据所述信号测量参数以及网络优先级的预置信息执行切换操作，包括：
    将所述WLAN和LTE网络的信号测量参数进行比较；
    在所述WLAN的信号测量参数大于LTE网络的信号测量参数时，产生由WLAN承载通信服务的切换指令；
    在所述WLAN的信号测量参数小于LTE网络的信号测量参数时，产生由LTE网络承载通信服务的切换指令。
  8. 根据权利要求6所述的方法，其中，
    在所述网络优先级的预置信息为第二预置信息时，所述根据所述信号测量参数以及网络优先级的预置信息执行切换操作，包括：
    将所述WLAN的信号测量参数与第一预设阈值进行比较；
    在所述WLAN的信号测量参数大于或等于所述第一预设阈值时，产生继续由WLAN承载通信服务的切换指令；
    在所述WLAN的信号测量参数小于所述第一预设阈值时，将所述WLAN和LTE网络的信号测量参数进行比较；
    在所述WLAN的信号测量参数大于或等于所述LTE网络的信号测量参数时，产生继续由WLAN承载通信服务的切换指令；
    在所述WLAN的信号测量参数小于所述LTE网络的信号测量参数时，产生由LTE网络接替WLAN承载通信服务的切换指令。
  9. 根据权利要求6所述的方法，其中，
    在所述网络优先级的预置信息为第三预置信息时，所述根据所述信号测量参数以及网络优先级的预置信息执行切换操作，包括：
    将所述LTE网络的信号测量参数与第二预设阈值进行比较；
    在所述LTE网络的信号测量参数大于或等于所述第二预设阈值时，产生继续由LTE网络承载通信服务的切换指令；
    在所述LTE网络的信号测量参数小于所述第二预设阈值时，将所述WLAN和LTE网络的信号测量参数进行比较；
    在所述LTE网络的信号测量参数大于或等于所述WLAN的信号测量参数时，产生继续由LTE网络承载通信服务的切换指令；
    在所述LTE网络的信号测量参数小于所述WLAN的信号测量参数时，产生由WLAN承载通信服务的切换指令。
  10. 根据权利要求5所述的方法，其中，所述根据所述信号测量参数以及网络优先级的预置信息执行切换操作，包括：
    根据所述信号测量参数以及网络优先级的预置信息产生切换指令；
    判断所述切换指令的有效时间是否达到乒乓切换算法的预设时间；
    若达到，则判定所述切换指令有效，并根据切换指令执行切换操作；
    若未达到，则判定所述切换指令无效，并由当前承载通信服务的网络继续承载通信服务。
  11. 根据权利要求5所述的方法，其中，所述LTE网络上报的信号测量参数包括参考信号接收功率RSRP和参考信号接收质量参数RSRQ中的至少一个，所述WLAN上报的信号测量参数包括接收信号强度指示参数RSSI。
  12. 根据权利要求11所述的方法，其中，所述将所述WLAN和LTE网络的信号测量参数进行比较的步骤之前，所述方法包括：
    将所述WLAN和LTE网络的信号测量参数转变为具有相同单位级。
  13. 一种实现无线局域网络WLAN和长期演进LTE网络自动切换连接的通信终端，其中，所述通信终端包括收发器、存储器以及与所述收发器和存储器连接的处理器，其中，
    所述收发器用于接收WLAN和LTE网络上报的用于标识信号质量的信号测量参数；
    所述存储器用于存储网络优先级的预置信息，所述网络优先级用于标识在WLAN和LTE网络共存时优先用于承载通信服务的网络；
    所述处理器用于根据所述信号测量参数以及网络优先级的预置信息执行切换操作，以从WLAN和LTE网络中选择一个承载通信服务。
  14. 根据权利要求13所述的通信终端，其中，所述网络优先级的预置信息包括第一预置信息、第二预置信息和第三预置信息中的一个，所述第一预置信息为由所述WLAN和LTE网络中信号质量最好的一个承载通信服务，所述第二预置信息为优先由WLAN承载通信服务，所述第三预置信息为优先由LTE网络承载通信服务。
  15. 根据权利要求14所述的通信终端，其中，
    在网络优先级的预置信息为第一预置信息时，所述处理器用于：
    将所述WLAN和LTE网络的信号测量参数进行比较；
    在所述WLAN的信号测量参数大于LTE网络的信号测量参数时，产生由WLAN承载通信服务的切换指令；
    在所述WLAN的信号测量参数小于LTE网络的信号测量参数时，产生由LTE网络承载通信服务的切换指令；
    在网络优先级的预置信息为第二预置信息时，所述处理器用于：
    将所述WLAN的信号测量参数与第一预设阈值进行比较；
    在所述WLAN的信号测量参数大于或等于所述第一预设阈值时，产生继续由WLAN承载通信服务的切换指令；
    在所述WLAN的信号测量参数小于所述第一预设阈值时，将所述WLAN和LTE网络的信号测量参数进行比较；
    在所述WLAN的信号测量参数大于或等于所述LTE网络的信号测量参数时，产生继续由WLAN承载通信服务的切换指令；
    在所述WLAN的信号测量参数小于所述LTE网络的信号测量参数时，产生由LTE网络接替WLAN承载通信服务的切换指令；
    在网络优先级的预置信息为第三预置信息时，所述处理器用于：
    将所述LTE网络的信号测量参数与第二预设阈值进行比较；
    在所述LTE网络的信号测量参数大于或等于所述第二预设阈值时，产生继续由LTE网络承载通信服务的切换指令；
    在所述LTE网络的信号测量参数小于所述第二预设阈值时，将所述WLAN和LTE网络的信号测量参数进行比较；
    在所述LTE网络的信号测量参数大于或等于所述WLAN的信号测量参数时，产生继续由LTE网络承载通信服务的切换指令；
    在所述LTE网络的信号测量参数小于所述WLAN的信号测量参数时，产生由WLAN承载通信服务的切换指令。
  16. 根据权利要求15所述的通信终端，其中，所述处理器还用于判断所述切换指令的有效时间是否达到乒乓切换算法的预设时间；若达到，则所述处理器判定所述切换指令有效，并根据切换指令执行切换操作；若未达到，则所述处理器判定所述切换指令无效，并由当前承载通信服务的网络继续承载通信服务。
  17. 根据权利要求13所述的通信终端，其中，所述LTE网络上报的信号测量参数包括参考信号接收功率RSRP和参考信号接收质量参数RSRQ中的至少一个，所述WLAN上报的信号测量参数包括接收信号强度指示参数RSSI。
  18. 根据权利要求17所述的通信终端，其中，在将所述WLAN和LTE网络的信号测量参数进行比较之前，所述处理器还用于将所述WLAN和LTE网络的信号测量参数转变为具有相同单位级。
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