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VoLTE到底是啥?4G网络常见名词解释 - 站长搜索
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VoLTE到底是啥?4G网络常见名词解释

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2016-01-13 12:03:05 转载来源: 网络整理/侵权必删

VoLTE的全称是Voice over LTE(LTE通话),它是一种IP数据传输技术,无需2G/3G网,全部业务承载于4G网络上,可实现数据与语音业务在同一网络下的统一,而且通话质量得到较大提升,目前各家运营商都在进行VoLTE的布局,未来全面商用是个趋势,不过由于对全网改造力度大,因此实施起来并不容易。由于目前的4G网络没有实现VoLTE,因此4G网络本身无法提供通话功能,主流的4G通话方案主要有两种:CSFB(即Circuit Switched Fallback,电路域回落),即通话的时候从4G网络回落到3G/2G网络,通话完毕再切换到4G网络,在手机上方的信号栏,你只会看到一个4G信号

VoLTE的全称是Voice over LTE(LTE通话),它是一种IP数据传输技术,无需2G/3G网,全部业务承载于4G网络上,可实现数据与语音业务在同一网络下的统一,而且通话质量得到较大提升,目前各家运营商都在进行VoLTE的布局,未来全面商用是个趋势,不过由于对全网改造力度大,因此实施起来并不容易。

VoLTE到底是啥?4G网络常见名词解释

由于目前的4G网络没有实现VoLTE,因此4G网络本身无法提供通话功能,主流的4G通话方案主要有两种:

CSFB(即Circuit Switched Fallback,电路域回落),即通话的时候从4G网络回落到3G/2G网络,通话完毕再切换到4G网络,在手机上方的信号栏,你只会看到一个4G信号。目前,iPhone 6采用的就是这种方案。优势是成本较低,缺点就是中间可能会有1秒钟左右的延迟,而且通话的时候手机上网会中断。

SGLTE(即Simultaneous GSM and LTE,GSM网络和LTE网络同步支持),通俗的讲就是双待机,或叫单卡双待,在手机上多加装了一颗基带芯片,提供单独的2G网待机,仅用于通话。手机只要插入一张SIM卡,就能够同时工作在LTE网络和2G/3G网络环境下,这就是双待机模式,采用该模式的4G手机上方的信号栏会看到两个信号。缺点是成本较高,且耗电大影响手机续航。

而VoLTE则是在4G LTE网络中单独划分一部分带宽,将语音转化为数据,使用这部分带宽发送,从而在4G网络下直接实现通话。具备呼叫等待时间更短、音质更好、视频通话更清晰等优点,要优于CSFB和SGLTE,但前提是整个4G网络覆盖已经很好,VoLTE才能有效发挥作用,否则遇到没4G信号的情况下,电话将无法拨通。

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标签: VoLTE 到底 4G 网络 常见 名词解释


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