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LTE 承载建立修改释放流程学习整理-修订版

作者:高考题库网
来源:https://www.bjmy2z.cn/gaokao
2021-02-08 09:40
tags:

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2021年2月8日发(作者:rolly)


LTE


专有承载建立,修改,释放



组网和接口图:




UTRAN



SGSN



GERAN



S1-MME



HSS



S3



MME



S11



LTE- Uu



UE



E-UTRAN



S1-U



S10



S6a



PCRF



S12



S4



Serving



Gateway



S5



Gx



PDN



Gateway



SGi



Rx



Operator's IP


Services



(e.g. IMS, PSS etc.)




LTE


中用户数据传输流程:







Application / Service Layer



UL Traffic Flow Aggregates



UL-TFT



?


UL-TFT




RB-ID




1-TEID



RB-ID



?


S


DL Traffic Flow Aggregates



DL-TFT




DL-TFT



?




S5/S8-TEID



S1-TEID



?


S5/S8-TEID




UE



Radio Bearer










eNodeB


eNB


Serving GW



S1 Bearer



S5/S8 Bearer



PDN GW




EPS


承载是什么?



我理解就是


UE



PGW


的一个用户数据传输通道。



< p>
EPS


承载


ID


作用?< /p>



唯一的标识


EPS

承载。


MME


分配。


EPS RB ID



EPS bearer ID


是 一对一的,


对应关系


E-NodeB


维 护。




承载建立场景:



EPS


专有承载建立目的是为了满足用户特定的


QOS


(核 心网提供)需求,建立之前必须有缺


省的


EPS


承载。



通过网络侧触发数据承载建立流程,其触发条 件可以是


IP


多媒体子系统


(IMS)


会话中的策略


与计费规则功能实体


(P CRF)


交互、初始附着时移动性管理实体


(MME)


指示,或是由


UE


请求,


从而方便未来很多由网络端发起的业务的


QoS


及策略控制。



建立的信令流程:




UE



eNodeB



MME



Serving GW



(A)



PDN GW



PCRF



1. IP-CAN Session


Modification


2. Create Bearer Request




3. Create Bearer Request



4. Bearer Setup Request/


Session Management Request


5. RRC Connection Reconfiguration



6. RRC Connection Reconfiguration Complete




7. Bearer Setup Response



8. Direct Transfer



9. Session Management Response



10. Create Bearer Response



11. Create Bearer Response



12. IP-CAN Session


Modification


(B)





关键信令消息字段:



1.



PCC decision provision



Qos Policy

< br>(动态


PCC


时才需要)



2.



Create Bearer Request



IMSI, PTI


(只用于


UE


请求的承载资源修改流程)


, EPS Bearer QoS,


TFT,


S5


/S8 TEID


(给专有承载新分配的)


, Charging Id, LBI


(连接的


EPS


承载< /p>


ID


,即默认承


载的

ID



, Protocol Configuration Options


(用于在


UE< /p>



PGW


之间传输应用级参数,


透明


传输在


MME


和< /p>


SGW




3.



Create Bearer Request



IMSI, PTI, EPS Bearer QoS, TFT,


S1-TEID


, LBI, Protocol Configuration


Options


4.



Session


Management


Request

NAS


消息发给


UE


< p>
PTI,


TFT,


EPS


Bearer


QoS


parameters


(excluding ARP), Protocol Configuration Options, the EPS Bearer Identity and the Linked EPS


Bearer Identity (LBI)


Bearer Setup Request


发给


E-NODEB



EPS Bearer Identity, EPS Bearer QoS, Session


Management Request,


S1-TEID



5.



RRC Connection Reconfiguration



Radio Bearer QoS, Session Management Request, EPS RB


Identity


(透传


NAS


消息 )



7. Bearer Setup Response



EPS Bearer Identity,


S1-TEID



8. Session Management Response



Direct Transfer




UE


< p>
nas


层建立此消息,


携带


EPS Bearer


Identity


9. Session Management Response



E-nodeB


转发这个上行


NAS


传 输给


MME


10. Create Bearer Resp onse


(消息


7


< br>9


都收到之后发送)




EPS Bearer Identity,


S1-TEID



11. Create Bearer Response



EPS Bearer Identity,


S5


/S8-TEID




承载修改场景


1



PGW


发起的,由于


QOS


更新触发的承载修改流程。




信令流程:




UE



eNodeB



MME



Serving GW



(A)



PDN GW



PCRF



1. IP-CAN Session


Modification


2. Update Bearer request



3. Update Bearer Request



4. Bearer Modify Request/


Session Management Request



5. RRC Connection Reconfiguration



6. RRC Connection Reconfiguration Complete



8. Direct Transfer



9. Session Management Response



10. Update Bearer Response



11. Update Bearer response



12. IP-CAN Session


Modification


(B)



7. Bearer Modify Response









关键信令消息字段:



2. Update Bearer Request



PTI



用于


UE


发起的修 改流程)


, EPS Bearer Identity,


EPS Bearer QoS


,


APN-AMBR, TFT


3. Update Bearer Request



PTI, EPS Bearer Identity, EPS Bearer QoS, TFT, APN-AMBR


4.


Session


Management


Request


发送给


UE



PTI, EPS Bearer


QoS


parameters (


包括


ARP), TFT,


APN-AMBR, EPS Bearer Identity


,这个过程


UE


不应该拒绝。



发送


Bearer


Modify < /p>


Request



E-Nodeb



EPS


Bearer


Identity,


EPS


Bearer


QoS,


Session


Management Request, UE-AMBR


5.


RRC


Connection


Reconfiguration



Radio


Bearer


QoS,


Session


Management


Request,


EPS


RB


Identity


7. Bearer Modify Response



EPS Bearer Identity



EnodeB


告诉

< br>MME



EPS


承载能否被建立



8. Direct Transfer (Session Management Response)



EPS Bearer Identity



NAS

层创建



Bearer Response



EPS Bearer Identity


11. Update Bearer Response



EPS Bearer Identity



承载修改场景


2



HSS


发起的,由于用户签约 信息


QOS


更新触发的承载修改流程。




PS


:这里更新的

< br>QOS


信息是用户签约信息(


HSS

发起的


Insert


Subscriber

< p>
Data


,插入的就是


用户签约信息)

< p>




信令流程:




UE



eNodeB



MME



Serving GW



PDN GW



PCRF



HSS



1. Insert Subscriber data



1a. Insert Subscriber data Ack



. 2a. UE Ctxt Update



2b. Modify Bearer Command



3. Modify Bearer Command



(A)



4. PCEF Initiated IP-CAN


Session Modification




5. Update Bearer Request



6. Procedure as in TS 23.401, steps 3 to 10 of


Figure 5.4.2.1-1 or steps 3 to 8 of Figure 5.4.3-1



(B)



7. Update Bearer Response



8. Provision Ack





关键信令消息字段:



1. Insert Subscriber Data



IMSI, Subscription Data



EPS subscribed QoS (QCI, ARP)



subscribed


UE-AMBR and APN- AMBR




1a. Insert Subscriber Data Ack



IMSI


2a. UE Context Modification Procedure



eNB


MME


UE CONTEXT MODIFICATION REQUEST


UE CONTEXT MODIFICATION RESPONSE



-


the


Security Key


IE.


-


the


Subscriber Profile ID for RAT/Frequency priority


IE.


-


the


UE Aggregate Maximum Bit Rate


IE.


-


the


CS Fallback Indicator


IE.


-


the


UE Security Capabilities


IE.



-


the


CSG Membership Status


IE.


-


the


Registered LAI


IE.



2.


如果修改的


UE- AMBR


,触发


S1-AP


UE


Context


Modification


Procedure


;如果修改的


QCI,ARP


,APN-AMBR


,并且有激活的


PDN


连接触发


2b


2b. Modify Bearer Command



EPS Bearer Identity, EPS Bearer QoS, APN-AMBR


3. Modify Bearer Command



EPS Bearer Identity, EPS Bearer QoS, APN-AMBR


5. Update Bearer Request



EPS Bearer Identity, EPS Bearer QoS, TFT, APN-AMBR


< br>承载修改场景


3



< p>
PGW


发起的,非


QOS


更新触发的承载修改流程。



这个流程用于为激活的默认承载或 者专有承载更新


TFT


(与承载相对应,提供包过滤功能来


选择对应的专有承载)


,或者用于更新


AP N-AMBR


(需要,


PGW


协商后应 用的


ANP-AMBR



经过


SGW



MME



E-NodeB


通知给


UE





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