WO2016165458A1 - 一种语音通话的方法及终端 - Google Patents

一种语音通话的方法及终端 Download PDF

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Publication number
WO2016165458A1
WO2016165458A1 PCT/CN2016/073520 CN2016073520W WO2016165458A1 WO 2016165458 A1 WO2016165458 A1 WO 2016165458A1 CN 2016073520 W CN2016073520 W CN 2016073520W WO 2016165458 A1 WO2016165458 A1 WO 2016165458A1
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bearer
terminal
service information
voice service
network
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PCT/CN2016/073520
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English (en)
French (fr)
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于欣
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中兴通讯股份有限公司
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Publication of WO2016165458A1 publication Critical patent/WO2016165458A1/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
    • H04W36/142—Reselecting a network or an air interface over the same radio air interface technology

Definitions

  • This document relates to, but is not limited to, the field of communications, and in particular to a method and terminal for a voice call.
  • the voice solutions under the LTE network are mainly as follows: CSFB (CSFallback, circuit domain fallback), single card dual standby, and VOLTE (Voice over LTE, based on IMS (IP Multimedia Subsystem, IP Multimedia Subsystem) voice service, where VOLTE is the real voice solution for LTE networks.
  • CSFB Cell-to-Binto-Binto-Binto-Binto-Binto-Bin
  • IMS IP Multimedia Subsystem
  • IP Multimedia Subsystem IP Multimedia Subsystem
  • a VOLTE voice call is performed on a network that supports the VOLTE function
  • a new network that does not support the VOLTE function
  • the terminal obtains the support capability of the network.
  • the terminal may directly disconnect the voice call with the network, or keep the link but cannot guarantee the voice service, such as no sound or poor call quality.
  • the terminal transmits signaling on the original cell, and when the network responds, the terminal has arrived at the new cell, and the signaling cannot be retransmitted, resulting in a call delay. .
  • the embodiment of the invention provides a method and a terminal for a voice call to ensure the call security of the VOLTE terminal.
  • the embodiment of the invention provides a method for a voice call, including:
  • the monitoring terminal switches from the VOLTE network to the non-VOLTE network during the call;
  • the foregoing method further has the following feature: the reselecting the bearer to transmit the voice service information, including:
  • the status of the bearer in the bearer list is searched, and the bearer request resource is selected in the order of priority to transmit the voice service information; if the available bearer is not found, the dedicated bearer is requested to perform the voice service information transmission; or
  • the foregoing method further has the following feature: after the requesting to establish a dedicated bearer for transmitting the voice service information, the method further includes:
  • the voice call is hanged up, or the status of the bearer in the bearer list is searched, and the bearer request resource is selected in priority order for voice service information transmission.
  • the foregoing method further has the following feature: after the monitoring bearer changes, the method further includes:
  • the voice data of the terminal is expanded to a common attribute.
  • the above method further has the following features:
  • the bearer is monitored for changes. If the change is made, the changed bearer information is extracted, and the bearer list is updated according to the specified priority.
  • the foregoing method further has the following feature: whether the monitoring bearer changes, including:
  • the embodiment of the invention further provides a terminal, which includes:
  • the network monitoring module is configured to monitor the terminal to switch from the VOLTE network to the non-VOLTE network during the call;
  • the call processing module is configured to transmit the voice service information by using the designated bearer on the new network, or to re-select the bearer to transmit the voice service information when the bearer changes.
  • the foregoing terminal further has the following features:
  • the call processing module re-selects the bearer to transmit the voice service information, including: searching for the status of the bearer in the bearer list, and selecting the bearer request resource to transmit the voice service information according to the priority order; if the available bearer is not found, Requesting to establish a dedicated bearer for the delivery of voice service information, or directly requesting the establishment of a dedicated bearer for the delivery of voice service information.
  • the foregoing terminal further has the following features:
  • the call processing module after requesting to establish a dedicated bearer for transmitting the voice service information, is further configured to: if the response message is not received within the specified time period or the rejection command is received, the voice call is hung up, or the bearer list is searched The state of the bearer, the bearer request resource is selected in the order of priority to transmit the voice service information.
  • the foregoing terminal further has the following features:
  • the call processing module is further configured to: expand the voice data of the terminal into a common attribute after the monitoring bearer changes.
  • the foregoing terminal further has the following features:
  • the bearer monitoring module is configured to monitor whether the bearer changes, such as a change, extracting information of the changed bearer, and updating the bearer list according to the specified priority.
  • the foregoing terminal further has the following features:
  • the bearer monitoring module which detects whether the bearer has changed, includes: extracting a bearer status reported by the terminal, where the bearer status includes a first evolved packet system bearer status cell value (EBI) in the routing area update request signaling; a bearer status of the terminal, where the bearer status includes a second EBI cell value in the routing area update acceptance signaling; if the first EBI cell value and the second EBI cell value are inconsistent, determining that the bearer changes.
  • EBI evolved packet system bearer status cell value
  • the embodiments of the present invention provide a method and a terminal for a voice call, which can ensure the call security of a VOLTE terminal, that is, after switching from a VOLTE network to a non-VOLTE network. And guarantee the quality of the call.
  • FIG. 1 is a schematic diagram of a terminal according to an embodiment of the present invention.
  • FIG. 2 is a flowchart of a method for a voice call according to an embodiment of the present invention.
  • the terminal in the embodiment of the present invention includes: a network monitoring module, a bearer monitoring module, and a call processing module, where
  • the network monitoring module is configured to monitor whether the terminal switches from the VOLTE network to the non-VOLTE network during the call, and mainly detects whether the terminal moves to a non-VOLTE cell, and whether the voice call is at risk.
  • the bearer monitoring module is configured to determine a bearer state of the network after the network is changed to determine how the terminal guarantees the voice call.
  • the bearer monitoring module includes: a bearer list update submodule and a bearer change monitoring submodule, where
  • the bearer list update sub-module is configured to monitor the bearer between the terminal and the network, including bearer establishment/modification/deletion, extract corresponding bearer information, and update the bearer list in time according to a certain priority.
  • the bearer information includes bearer IDs and their corresponding QCI (QoS Class Identifier) and TFT (Traffic Flow Template).
  • QCI QoS Class Identifier
  • TFT Traffic Flow Template
  • the bearer change monitoring sub-module is configured to monitor whether the bearer changes after the network changes.
  • the VOLTE service is essentially a special data service that needs to be transmitted on a dedicated bearer. And for a non-VOLTE network, can the terminal continue to provide the dedicated bearer currently in use? The pre-protocol is not specified. Therefore, after the network status changes, how does the call continue? Depending on whether the dedicated bearer still exists, whether the corresponding bearer changes after the TAU (Tracking area update), the terminal and the network The EBI cell is informed by the TAU Request (TAU Request) and TAU Accept (TAU Receive) signaling.
  • the call processing module includes a bearer selection submodule and a call hold submodule, and is configured to determine how to ensure call security according to the state of the network, and use the designated bearer on the new network to transmit voice service information, or in the bearer monitoring module.
  • the bearer is re-selected or the bearer is applied to establish the bearer to transmit the voice service information.
  • the bearer monitoring module detects that the bearer has not changed, the voice call is continuously maintained on the original bearer.
  • the network informs the terminal that the current network does not support the VOLTE function through the VOPS (IMS voice over PS session indicator) cell in the TAU Accept signaling, and the dedicated bearer used by the VOLTE corresponding has also been released, it is required. Re-select the bearer and deliver the voice service information on the selected bearer. If the corresponding dedicated bearer still exists, then the call is guaranteed to continue instead of dropped calls or no sound.
  • VOPS IMS voice over PS session indicator
  • the bearer selection sub-module is configured to re-select the bearer, including searching for the current bearer status in the bearer list, selecting the optimal bearer, and negotiating the resource with the network, and confirming whether the bearer can guarantee the terminal voice call according to the network condition. If yes, the terminal transmits voice service information on the bearer, and if not, requests the resource on the first priority bearer. If no available bearers are found, the network is requested to establish a dedicated bearer to guarantee the call. If the bearer cannot be established, hang up the call and give a message.
  • the call processing module is further configured to expand the voice data of the terminal into a common attribute after the bearer monitoring module detects that the bearer has changed.
  • the data can be transmitted on the specific bearer and must meet the requirements of the bearer TFT parameter. Therefore, if the voice data can be transmitted on the selected bearer, the data must be selected.
  • the TFT parameters of the bearer are fixed, so in this case, the general TFT attribute of the voice data will be given.
  • the bearer selection further includes: when the original bearer of the terminal disappears, the call holding submodule is configured to establish a dedicated bearer, including: the terminal requests the network to perform resource allocation, and after receiving the terminal request, the network confirms whether it can be given according to the network condition.
  • the terminal allocates a dedicated contract that can be used for VOLTE If enabled, the dedicated bearer setup procedure is initiated; if not, the network does not respond to the endpoint or respond to the reject command. If the terminal does not receive the information or receives the reject command within a certain period of time, the terminal hangs up the call, or searches for the status of the bearer in the bearer list, and selects the bearer request resource in priority order to transmit the voice service information.
  • FIG. 2 is a flowchart of a method for a voice call according to an embodiment of the present invention. The method is applied to a terminal, and includes the following steps:
  • step 11 the terminal monitors switching from the VOLTE network to the non-VOLTE network during the call.
  • Step 12 The terminal uses the designated bearer on the network to transmit the voice service information, or when the monitoring bearer changes, re-select the bearer to transmit the voice service information.
  • the terminal may further include: the terminal voice data is expanded into a universal attribute, and the universal attribute has the capability of transmitting on all the bearers.
  • the terminal when the terminal establishes a link with the network, multiple bearers are established, and the terminal monitors the network bearer update information. If the bearer is established, modified, and/or deleted, the corresponding bearer information is extracted, and is updated in time according to a certain priority. In the list of hosts.
  • the bearer information includes a bearer ID and corresponding bearer parameters such as QCI and TFT.
  • the bearer includes a dedicated bearer and a default bearer. Different QCIs, the TFT parameters indicate the type of service that the bearer can bear.
  • the dedicated bearer is in the front, and the default bearer is in the back; the GBR is carried in the front, the non-GBR is carried in the back; the voice related bearer is in the front, and the non-voice related bearer is in the back.
  • the terminal After the terminal enters a new cell, if the TAI (Tracking Area Identity) of the cell is not in the terminal TAI list, the terminal initiates a normal TAU (Tracking Area Update) process.
  • the TAU accept signaling is used to inform the terminal whether the current network status supports VOLTE, that is, the value of VOPS (1 is supported, 0 is not supported).
  • the network change monitoring in the embodiment includes the following steps:
  • Step S101 The VOLTE terminal starts a VOLTE voice call and is in motion
  • Step S102 The VOLTE terminal starts monitoring whether the terminal moves to a cell of a different TA, if it is to proceed to step 103, if not, no action is performed;
  • Step S103 Extracting whether the network changes parameters, such as a VOPS cell value in the TAU Accept signaling;
  • Step S104 Determine whether the current network supports VOLTE by using a network state change parameter (such as a VOPS value). If yes, no action is taken. If not, the voice call flow is started.
  • a network state change parameter such as a VOPS value
  • Whether the terminal network changes include, but is not limited to, whether the terminal has a TAU process, and whether the corresponding network parameter changes.
  • the network parameters include, but are not limited to, VOPS cell values in TAU Accept signaling.
  • the following is an example of how the wireless terminal moves from a VOLTE-enabled cell to a non-VOLTE, different TA cell, and how to monitor whether the network EPS bearer changes, including the following steps:
  • Step S201 If the network change module detects that the network changes, the bearer change monitoring process is started.
  • Step S202 Extract the bearer status reported by the terminal.
  • Step S203 extracting, by the network, the bearer status of the terminal
  • Step S204 Compare whether the bearer changes, if yes, enter the bearer update process, and if not, enter the call guarantee module.
  • the bearer status reported by the terminal includes an EBI (EPS bearer context status information element) (EPS) EBI1 in the TAU Request signaling, and the bearer status delivered by the network includes a TAU Accept message.
  • EBI EPS bearer context status information element
  • the comparison bearer changes whether EBI1 and EBI2 change, such as whether the reprint required for the voice call is released, so as to decide to continue the call.
  • the following is an example to illustrate the process of ensuring a normal call after a wireless terminal moves from a VOLTE-enabled cell to a non-VOLTE, different TA cell, including the following steps:
  • Step S401 The terminal starts a VOLTE voice call.
  • Step S402 monitoring whether the network status changes, if not changed, repeat step S402, if the change, then proceeds to step S403;
  • Step S403 monitoring whether the bearer status changes, if the change, then proceeds to step S404, if not changed, proceeds to step S405;
  • Step S404 ensuring that no call is dropped on the original bearer to ensure the quality of the call
  • Step S405 Find the current network bearer, and perform priority ordering according to certain rules.
  • Step S406 Select an optimal bearer and negotiate with the network to confirm whether the voice call can be guaranteed. If yes, go to step S408, if no, go to step S407.
  • Step S407 Select the second bearer and negotiate with the network to confirm whether the voice call can be guaranteed. If yes, go to step S408; if not, go to step S409.
  • Step S408 Perform voice information transmission on the selected bearer, and continue to hold the call;
  • Step S409 It is requested whether the network can establish a dedicated bearer. If yes, a dedicated bearer is established and the call is held on the bearer; if not, the call is hung up and a corresponding prompt is made.
  • the embodiment of the present invention is to determine whether the network bearer needs to be re-established and to continue to hold the call, and also consider that the default bearer must exist on the new cell, and the continuation of the terminal VOLTE call is ensured by using the default bearer.
  • all or part of the steps of the above embodiments may also be implemented by using an integrated circuit. These steps may be separately fabricated into individual integrated circuit modules, or multiple modules or steps may be fabricated into a single integrated circuit module. achieve.
  • the devices/function modules/functional units in the above embodiments may be implemented by a general-purpose computing device, which may be centralized on a single computing device or distributed over a network of multiple computing devices.
  • each device/function module/functional unit in the above embodiment When each device/function module/functional unit in the above embodiment is implemented in the form of a software function module and sold or used as a stand-alone product, it can be stored in a computer readable storage medium.
  • the above mentioned computer readable storage medium may be a read only memory, a magnetic disk or an optical disk or the like.
  • the call security of the VOLTE terminal can be ensured, that is, after the handover from the VOLTE network to the non-VOLTE network, the call is not dropped and the call quality is guaranteed.

Abstract

一种语音通话的方法及终端，该方法包括：监测终端在通话过程中从VOLTE网络切换到非VOLTE网络；利用网络上的指定承载进行语音业务信息的传递，或者监测承载发生变化时，重新选择承载进行语音业务信息的传递。通过本发明实施例可以保证VOLTE终端的通话安全性，即从VOLTE网络到非VOLTE网络切换后不掉话并保证通话质量。

Description

一种语音通话的方法及终端 技术领域
本文涉及但不限于通信领域，特别是涉及一种语音通话的方法及终端。
背景技术
随着LTE(Long Term Evolution，长期演进系统)网络的发展，LTE网络下的语音解决方案主要有如下几种：CSFB(CSFallback，电路域回落)，单卡双待以及VOLTE(Voice over LTE，基于IMS(IP Multimedia Subsystem，IP多媒体子系统)的语音业务)，其中，VOLTE才是真正的LTE网络的语音解决方案。对于一个网络是否支持VOLTE，是通过网络信令告知终端，若不支持，则终端不能在该网络下进行VOLTE业务。
因此，对于一个在支持VOLTE功能的网络下进行VOLTE语音通话时，又来到一个新的不支持VOLTE功能的不同TA(Tracking area，跟踪区)的网络下，并且终端获取到了网络的支持能力为不支持VOLTE后，终端可能直接断开与网络的语音通话链接，或者保持链接但不能够保证语音服务，如无声音或通话质量差。此外，如果在终端发起或挂断VOLTE通话过程中发生小区切换，则存在终端在原小区上传输信令而当网络回应时终端已经到达了新小区，无法接收信令需要重新传递而导致通话延时。
发明内容
以下是对本文详细描述的主题的概述。本概述并非是为了限制权利要求的保护范围。
本发明实施例提供一种语音通话的方法及终端，以保证VOLTE终端的通话安全性。
本发明实施例提供了一种语音通话的方法，包括：
监测终端在通话过程中从VOLTE网络切换到非VOLTE网络；
利用网络上的指定承载进行语音业务信息的传递，或者监测承载发生变 化时，重新选择承载进行语音业务信息的传递。
可选地，上述方法还具有下面特点：所述重新选择承载进行语音业务信息的传递，包括：
查找承载列表中的承载的状态，按优先级次序选择承载请求资源进行语音业务信息的传递；若找不到可用承载，则请求建立专用承载以进行语音业务信息的传递；或者
直接请求建立专用承载以进行语音业务信息的传递。
可选地，上述方法还具有下面特点：所述请求建立专用承载以进行语音业务信息的传递之后，还包括：
若在指定时长内未收到响应信息或收到拒绝指令，则挂断语音通话，或者查找承载列表中的承载的状态，按优先级次序选择承载请求资源进行语音业务信息的传递。
可选地，上述方法还具有下面特点：所述监测承载发生变化后，还包括：
将所述终端的语音数据扩展为通用属性。
可选地，上述方法还具有下面特点：还包括，
监测承载是否发生变化，若变化，则提取发生变化的承载的信息，按照指定优先级更新承载列表。
可选地，上述方法还具有下面特点：所述监测承载是否发生变化，包括：
提取终端上报的承载状态，该承载状态包括路由区更新请求信令中的第一演进分组系统承载状态EBI信元值；
提取网络下发终端的承载状态，该承载状态包括路由区更新接受信令中的第二EBI信元值；
若所述第一EBI信元值和所述第二EBI信元值不一致，则判断承载发生变化。
本发明实施例还提供了一种终端，其中，包括：
网络监测模块，设置为监测终端在通话过程中从VOLTE网络切换到非VOLTE网络；
通话处理模块，设置为利用新网络上的指定承载进行语音业务信息的传递，或者监测承载发生变化时，重新选择承载进行语音业务信息的传递。
可选地，上述终端还具有下面特点：
所述通话处理模块，重新选择承载进行语音业务信息的传递，包括：查找承载列表中的承载的状态，按优先级次序选择承载请求资源进行语音业务信息的传递；若找不到可用承载，则请求建立专用承载以进行语音业务信息的传递，或者直接请求建立专用承载以进行语音业务信息的传递。
可选地，上述终端还具有下面特点：
所述通话处理模块，请求建立专用承载以进行语音业务信息的传递之后，还设置为：若在指定时长内未收到响应信息或收到拒绝指令，则挂断语音通话，或者查找承载列表中的承载的状态，按优先级次序选择承载请求资源进行语音业务信息的传递。
可选地，上述终端还具有下面特点：
所述通话处理模块，监测承载发生变化后，还设置为：将所述终端的语音数据扩展为通用属性。
可选地，上述终端还具有下面特点：还包括，
承载监测模块，设置为监测承载是否发生变化，如变化，则提取发生变化的承载的信息，按照指定优先级更新承载列表。
可选地，上述终端还具有下面特点：
所述承载监测模块，监测承载是否发生变化包括：提取终端上报的承载状态，该承载状态包括路由区更新请求信令中的第一演进分组系统承载状态信元值(EBI)；提取网络下发终端的承载状态，该承载状态包括路由区更新接受信令中的第二EBI信元值；若所述第一EBI信元值和所述第二EBI信元值不一致，则判断承载发生变化。
综上，本发明实施例提供一种语音通话的方法及终端，可以保证VOLTE终端的通话安全性，即从VOLTE网络到非VOLTE网络切换后不掉 话并保证通话质量。
在阅读并理解了附图和详细描述后，可以明白其他方面。
附图概述
图1为本发明实施例的终端的示意图；
图2为本发明实施例的一种语音通话的方法的流程图。
本发明的较佳实施方式
下文中将结合附图对本发明的实施例进行详细说明。需要说明的是，在不冲突的情况下，本申请中的实施例及实施例中的特征可以相互任意组合。
如图1所示，本发明实施例的终端包括：网络监测模块、承载监测模块以及通话处理模块，其中，
网络监测模块，设置为监测终端在通话过程中是否从VOLTE网络切换到非VOLTE网络，主要实现检测终端是否移动到一个非VOLTE小区，语音通话是否存在风险。
所述承载监测模块，设置为通过分析网络变化后承载状态，以决定终端如何保障语音通话；所述承载监测模块包括：承载列表更新子模块及承载变化监测子模块，其中，
承载列表更新子模块，设置为监测终端与网络之间的承载，包括承载建立/修改/删除，提取对应承载信息并按照一定优先级及时更新在承载列表中。所述承载信息包括承载ID及其对应的QCI(QoS Class Identifier，服务质量类别标识)、TFT(Traffic flow template，数据业务流模板)等承载参数。所述按照一定优先级包括专用承载在前，默认承载在后；GBR(Guaranteed Bit Rate，保证比特速率)承载在前，非GBR承载在后；语音相关承载在前，非语音相关承载在后等。
所述承载变化监测子模块，设置为监测网络变化后承载是否发生变化。
VOLTE业务实质上是一种特殊的数据业务，需要在专用承载上传输。而对于一个非VOLTE网络，能否给终端继续提供当前使用的专用承载在当 前协议中并没有明确规定，因此，网络状态发生变化后，通话如何继续取决于专用承载是否仍然存在，而进行TAU(Tracking area update，路由区更新)后，对应的承载是否变化，终端和网络都会通过TAU Request(TAU请求)及TAU Accept(TAU接收)信令中EBI信元告知对方。
所述通话处理模块，包括承载选择子模块和通话保持子模块，设置为根据网络的状态决定如何保证通话安全，利用新网络上的指定承载进行语音业务信息的传递，或者在所述承载监测模块监测到承载发生变化时，重新选择承载或申请建立承载进行语音业务信息的传递，在所述承载监测模块监测到承载未发生变化时，在原有承载上继续保持语音通话。
例如，当网络通过TAU Accept信令中的VOPS(IMS voice over PS session indicator，基于IMS的语音)信元告知终端当前网络不支持VOLTE功能，并且VOLTE对应所使用的专用承载也已经释放，则需要重新选择承载并在所选择的承载上进行语音业务信息的传递。若对应的专用承载仍然存在，则保证通话继续而不是掉话或无声音。
所述承载选择子模块设置为重新选择承载，包括查找承载列表中当前承载状态，选择最优承载并与网络协商请求资源，根据网络情况确认该承载是否可以保证终端语音通话。如果是，则终端在该承载上传递语音业务信息，如果不是，在第次优先承载上请求资源。如果找不到可用承载，则请求网络建立专用承载以保证通话。若也无法建立承载，则挂断通话并给出提示信息。
在一可选实施例中，所述通话处理模块，还设置为在所述承载监测模块监测到承载发生变化后，将所述终端的语音数据扩展为通用属性。
由于网络数据传输使用哪个承载需要用TFT过滤器过滤，数据能在特定承载上传输必须符合该承载TFT参数要求，因此，若保证语音数据能够在所选择承载传输，则必须保证该数据能够通过选定承载的TFT参数，因此该情况下，将赋予语音数据通用TFT属性。
所述的承载选择还包括，当终端原有承载消失，所述通话保持子模块设置为建立专用承载，包括：终端请求网络进行资源分配，网络收到终端请求后，根据网络情况确认是否可以给终端分配一个可以用于VOLTE的专用承 载，如果可以，则启动专用承载建立流程；如果不可以，则网络不回应终端或回应拒绝指令。终端在一定时间内未收到信息或收到拒绝指令，则挂断通话，或者查找承载列表中的承载的状态，按优先级次序选择承载请求资源进行语音业务信息的传递。
图2为本发明实施例的一种语音通话的方法的流程图，应用于终端，包括如下步骤：
步骤11，终端监测在通话过程中从VOLTE网络切换到非VOLTE网络。
步骤12，终端利用网络上的指定承载进行语音业务信息的传递，或者监测承载发生变化时，重新选择承载进行语音业务信息的传递。
其中，终端重新选择承载进行语音业务信息的传递之前，还可以包括：终端语音数据扩展为通用属性，通用属性具有在所有承载上传输的能力。
本实施例中，当终端和网络建立链接时会建立多个承载，终端监测网络承载更新信息，如承载建立、修改和/或删除，则提取对应承载的信息，并按照一定优先级及时更新在承载列表中。所述承载信息包括承载ID及其对应的QCI、TFT等承载参数。承载包括专用承载及默认承载，不同的QCI，TFT参数标志着该承载可以承担的业务类型。
所述按照一定优先级包括专用承载在前，默认承载在后；GBR承载在前，非GBR承载在后；语音相关承载在前，非语音相关承载在后等。
当终端进入一个新的小区后，当该小区的TAI(Tracking Area Identity，跟踪区标识)不在终端TAI list中，则终端会发起正常的TAU(Tracking area update，跟踪区更新)流程。通过TAU accept信令告知终端当前网络状态是否支持VOLTE，即VOPS的值(1为支持，0为不支持)。实施例中的网络变化监测包括如下步骤：
步骤S101：VOLTE终端开始VOLTE语音通话并处于移动中；
步骤S102：VOLTE终端开始监测终端是否运动到不同TA的小区，如果是进入步骤103，如果不是，不做动作；
步骤S103：提取网络是否变化参数，如TAU Accept信令中VOPS信元值；
步骤S104：通过网络状态变化参数(如VOPS值)判断当前网络是否支持VOLTE，如果是，则不做动作，如果不是，则启动保障语音通话流程。
所述的终端网络是否变化包括但不限于终端是否发生TAU过程，并且对应的网络参数是否发生变化。所述的网络参数包括但不限于TAU Accept信令中的VOPS信元值。
以下以一个例子说明无线终端从一个支持VOLTE的小区移动到一个非VOLTE，不同TA的小区后，如何监测网络EPS承载是否变化的流程，包括如下步骤：
步骤S201：若网络变化模块监测到网络发生变化，则启动承载变化监测流程；
步骤S202：提取终端上报的承载状态；
步骤S203：提取网络告知终端的承载状态；
步骤S204：比较承载是否发生变化，如果是，则进入承载更新流程，如果不是，则进入通话保证模块。
所述的终端上报的承载状态包括TAU Request信令中EBI(EPS bearer context status information element，EPS(演进分组系统)承载状态信元值)EBI1，所述的网络下发的承载状态包括TAU Accept信令中的EBI EBI2，所述的比较承载是否发生变化即比较EBI1及EBI2是否发生变化，如语音通话所需的转载是否释放，以此决定继续保持通话的方案。
以下以一个例子说明无线终端从一个支持VOLTE的小区移动到一个非VOLTE，不同TA的小区后，保证正常通话的流程，包括以下步骤：
步骤S401：终端开始VOLTE语音通话；
步骤S402：监测网络状态是否发生变化，如果未变化，则重复步骤S402，如果变化，则进入步骤S403；
步骤S403：监测承载状态是否发生变化，如果变化，则进入步骤S404，如果未变化，则进入步骤S405；
步骤S404：在原有承载上保证不掉话，保证通话质量；
步骤S405：查找当前网络承载，并按照一定规则进行优先级排序；
步骤S406：选择最优承载并与网络协商，确认是否可以保证语音通话。如果是，进入步骤S408，如果不是，进入步骤S407。
步骤S407：选择第二承载并与网络协商，确认是否可以保证语音通话，如果是，则进入步骤S408；如果不是，则进入步骤S409。
步骤S408：在选择的承载的进行语音信息传输，继续保持通话；
步骤S409：请求网络是否可以建立专用承载，如果是，则建立专用承载并在此承载上保持通话；如果不是，则挂断电话，并做出对应提示。
本发明实施例是针对网络承载是否变化决定是否需要重新建立专用承载还继续保持通话，另外也可以考虑在新小区上默认承载一定存在，利用默认承载上保证终端VOLTE通话的继续。
本领域普通技术人员可以理解上述实施例的全部或部分步骤可以使用计算机程序流程来实现，所述计算机程序可以存储于一计算机可读存储介质中，所述计算机程序在相应的硬件平台上(如系统、设备、装置、器件等)执行，在执行时，包括方法实施例的步骤之一或其组合。
可选地，上述实施例的全部或部分步骤也可以使用集成电路来实现，这些步骤可以被分别制作成一个个集成电路模块，或者将它们中的多个模块或步骤制作成单个集成电路模块来实现。
上述实施例中的各装置/功能模块/功能单元可以采用通用的计算装置来实现，它们可以集中在单个的计算装置上，也可以分布在多个计算装置所组成的网络上。
上述实施例中的各装置/功能模块/功能单元以软件功能模块的形式实现并作为独立的产品销售或使用时，可以存储在一个计算机可读取存储介质中。上述提到的计算机可读取存储介质可以是只读存储器，磁盘或光盘等。
工业实用性
通过上述技术方案可以保证VOLTE终端的通话安全性，即从VOLTE网络到非VOLTE网络切换后不掉话并保证通话质量。

Claims (13)

  1. 一种语音通话的方法，包括：
    监测终端在通话过程中从基于长期演进的语音业务VOLTE网络切换到非VOLTE网络；
    利用网络上的指定承载进行语音业务信息的传递，或者，
    监测用于传递语音业务信息的承载发生变化时，重新选择承载进行语音业务信息的传递。
  2. 如权利要求1所述的方法，其中，所述重新选择承载进行语音业务信息的传递，包括：
    查找承载列表中的承载的状态，按优先级次序选择承载请求资源进行语音业务信息的传递；若找不到可用承载，则请求建立专用承载以进行语音业务信息的传递；或者
    直接请求建立专用承载以进行语音业务信息的传递。
  3. 如权利要求2所述的方法，还包括：所述请求建立专用承载以进行语音业务信息的传递之后，
    若在指定时长内未收到响应信息或收到拒绝指令，则挂断语音通话，或者查找承载列表中的承载的状态，按优先级次序选择承载请求资源进行语音业务信息的传递。
  4. 如权利要求1所述的方法，还包括：所述监测承载发生变化后，
    将所述终端的语音数据扩展为通用属性。
  5. 如权利要求1-4任一项所述的方法，还包括：
    监测用于传递语音业务信息的承载是否发生变化，若变化，则提取发生变化的承载的信息，按照指定优先级更新承载列表。
  6. 如权利要求5所述的方法，其中，所述监测承载是否发生变化，包括：
    提取终端上报的承载状态，该承载状态包括路由区更新请求信令中的第一演进分组系统承载状态EBI信元值；
    提取网络下发终端的承载状态，该承载状态包括路由区更新接受信令中的第二EBI信元值；
    若所述第一EBI信元值和所述第二EBI信元值不一致，则判断承载发生变化。
  7. 一种终端，包括：
    网络监测模块，设置为监测终端在通话过程中从VOLTE网络切换到非VOLTE网络；
    通话处理模块，设置为利用新网络上的指定承载进行语音业务信息的传递，或者监测用于传递语音业务信息的承载发生变化时，重新选择承载进行语音业务信息的传递。
  8. 如权利要求7所述的终端，其中：
    所述通话处理模块是设置为通过如下方式实现重新选择承载进行语音业务信息的传递：
    查找承载列表中的承载的状态，按优先级次序选择承载请求资源进行语音业务信息的传递；若找不到可用承载，则请求建立专用承载以进行语音业务信息的传递，或者直接请求建立专用承载以进行语音业务信息的传递。
  9. 如权利要求8所述的终端，所述通话处理模块，还设置为请求建立专用承载以进行语音业务信息的传递之后，若在指定时长内未收到响应信息或收到拒绝指令，则挂断语音通话，或者查找承载列表中的承载的状态，按优先级次序选择承载请求资源进行语音业务信息的传递。
  10. 如权利要求7所述的终端，所述通话处理模块，还设置为监测承载发生变化后将所述终端的语音数据扩展为通用属性。
  11. 如权利要求7-10任一项所述的终端，还包括：
    承载监测模块，设置为监测用于传递语音业务信息的承载是否发生变化，如变化，则提取发生变化的承载的信息，按照指定优先级更新承载列表。
  12. 如权利要求7-11任一项所述的终端，其中：
    所述承载监测模块，监测承载是否发生变化包括：提取终端上报的承载 状态，该承载状态包括路由区更新请求信令中的第一演进分组系统承载状态标识EBI信元值；提取网络下发终端的承载状态，该承载状态包括路由区更新接受信令中的第二EBI信元值；若所述第一EBI信元值和所述第二EBI信元值不一致，则判断承载发生变化。
  13. 一种计算机可读存储介质，存储有程序指令，当该程序指令被执行时可实现权利要求1-6中任一项所述的方法。
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