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善于提问，勤于回答，你也是专家
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问题已开启
(普通问题)
什么事non-EPS服务
看协议，detach的服务有EPS services和non-EPS services。
这个non-EPS services是什么？是指短信这样的业务吗？
这个non-EPS services是什么？是指短信这样的业务吗？
再问个问题，关于LTE detach类型，看了一下协议再搜了搜网上的说法
EPS detach --- 这个比较好理解，就是非关机去附着，不做业务。
IMSI detach --- 有些人说是关机去附着，有些人说是正常去附着的一种。到底是关机还是正常去附着呢？如果是正常去附着，又是哪种去附着呢？
combined EPS/IMSI detach --- 这个又怎么理解呢？
EPS detach --- 这个比较好理解，就是非关机去附着，不做业务。
IMSI detach --- 有些人说是关机去附着，有些人说是正常去附着的一种。到底是关机还是正常去附着呢？如果是正常去附着，又是哪种去附着呢？
combined EPS/IMSI detach --- 这个又怎么理解呢？
提问者:
• SA语音业务EPSFB回落4G后不进行volte，GSMCALL超时、失败 2020-09-02
• 5G语音EPSFB的全信令流程 2020-08-04
• 个EPS承载唯一标识某一个ue和一个服务网关之间同一种qos的所有业务流 2017-06-07
• 请教大神们·EPSAKA中MME发送SNID有什么用 2017-06-01
• LTEPS业务态下重定向到2G路由更新失败 2017-04-12
• lte中，NAS层的EPSbeareridentity如何定义的啊 2017-03-09
• LTEPSS/SSS 2017-02-23
• 哪位大神有华为EPS01B的使用手册 2016-11-23
• 5G语音EPSFB的全信令流程 2020-08-04
• 个EPS承载唯一标识某一个ue和一个服务网关之间同一种qos的所有业务流 2017-06-07
• 请教大神们·EPSAKA中MME发送SNID有什么用 2017-06-01
• LTEPS业务态下重定向到2G路由更新失败 2017-04-12
• lte中，NAS层的EPSbeareridentity如何定义的啊 2017-03-09
• LTEPSS/SSS 2017-02-23
• 哪位大神有华为EPS01B的使用手册 2016-11-23
问题答案
( 1 )
根据3GPP 24301中的介绍
attach的目的：
The attach procedure is used to attach to an EPC for packet services in EPS.
The attach procedure is used for three purposes:
- by a UE in PS mode of operation to attach for EPS services only;
- by a UE in CS/PS mode 1 or CS/PS mode 2 of operation to attach for both EPS and non-EPS services; or
- to attach for emergency bearer services.
detach 的目的：
by the UE to detach for EPS services only;
- by the UE to disconnect from the last PDN it is connected to;
- by the UE in CS/PS mode 1 or CS/PS mode 2 of operation to detach for both EPS services and non-EPS services or for non-EPS services only via a combined detach procedure;
- by the network to inform the UE that it is detached for EPS services or non-EPS services or both;
- by the network to disconnect the UE from the last PDN to which it is connected; and
- by the network to inform the UE to re-attach to the network and re-establish all PDN connections.
The detach procedure also applies to the UE which is IMSI attached for "SMS only".
attach的目的：
The attach procedure is used to attach to an EPC for packet services in EPS.
The attach procedure is used for three purposes:
- by a UE in PS mode of operation to attach for EPS services only;
- by a UE in CS/PS mode 1 or CS/PS mode 2 of operation to attach for both EPS and non-EPS services; or
- to attach for emergency bearer services.
detach 的目的：
by the UE to detach for EPS services only;
- by the UE to disconnect from the last PDN it is connected to;
- by the UE in CS/PS mode 1 or CS/PS mode 2 of operation to detach for both EPS services and non-EPS services or for non-EPS services only via a combined detach procedure;
- by the network to inform the UE that it is detached for EPS services or non-EPS services or both;
- by the network to disconnect the UE from the last PDN to which it is connected; and
- by the network to inform the UE to re-attach to the network and re-establish all PDN connections.
The detach procedure also applies to the UE which is IMSI attached for "SMS only".
回答者：
OscarDon
回答时间：2013-12-10 15:22
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