VOLTE parameter in Attach Request/Accept message

VOLTE字面上是:Voice over LTE. 但是人们所提到的VOLTE,实际上是指“Voice over LTE utilizing IMS”

Attach Request/Accept消息中包含了VOLTE相关的参数。

 1. Attach request

参考: 3GPP 24.301 – 8.2.4

关注红框内的3个参数：

SrvccToGeranOrUtranCapability

参考： 3GPP 24.008 – 10.5.5.12

SRVCC to GERAN/UTRAN capability

0 SRVCC from UTRAN HSPA or E-UTRAN to GERAN/UTRAN not supported

1 SRVCC from UTRAN HSPA or E-UTRAN to GERAN/UTRAN supported

UE usage setting/voice preference 

参考： 3GPP 24.008 – 10.5.5.28

? 关于Voice centric 和Data centric

参考3GPP 23.221 – 7.2a

 

以上这一段话，可以这样来理解：

· UE设置为“Voice centric”, 将确保语音业务能够进行。比如： 如果网络不支持CSFB和IMS voice, 那么UE 将disable LTE,从而是UE 重选至2G/3G cell, 从而保证语音业务能够进行；

· UE设置为“Data centric”, 如果所驻留的网络不支持CSFB和IMS voice，UE 也会继续驻留在LTE cell.

? 关于Voice preference

如果LTE网络及支持CSFB,也支持IMS VOICE,那么通话时，应该选哪个呢？这是就要看这个参数了。

2. Attach accept

如何确定网络是否支持CSFB以及是否支持IMS呢？可以通过ATTACH ACCEPT消息.

参考： 3GPP 24.301 – 8.2.1

IMS voice over PS session indicator (IMS VoPS)

0:  IMS voice over PS session in S1 mode not supported

1:  IMS voice over PS session in S1 mode supported

这一参数来表示网络是否支持IMS(Voice over LTE utilizing IMS)

时间： 2024-10-12 20:09:53

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