UE:
It is the mobile terminal authorized to be used in and LTE Network.
An IMS Powered UE :
It required two components:-
UICC (Universal Intergrated circuit card):
UE must contain one UICC and UICC may have one or more modules .
SIM: used by GSM network
USIM: Used by UMTS or LTE network
CSIM: used by CDMA neytwork
ISIM: used by IMS network .It contains IMPI(IP Multimedia Private Identity) , IMPU(IP multimedia Public identity) and secret key . IMPI is global identity given by home network. IMPU acts like telephone number or SIP URI.Secret key is used for user authentication and sip registration.
SIP UA (SIP USerAgent)
its acts as UAS and UAC
EnodeB:
The E-UTRAN handles the radio communications between the mobile and the evolved packet core( EPC)and just has one component, the evolved base stations, called eNodeB.
Each eBN connects with the EPC by means of the S1 interface used for signalling and it can also be connected to nearby base stations by the X2 interface for packet forwarding during handover.
EPC (Evolved Packet Core):
MME:
mobility management entity (MME) controls the high-level operation of the mobile by means of signalling messages and Home Subscriber Server (HSS).
HSS:
The Home Subscriber Server (HSS) component is a central database that contains information about all the network operator's subscribers.
SGW(Serving Gateway):
Acts as a router, and forwards data between the base station and the PDN gateway.
PGW(PDN Gateway):
Packet Data Network Gateway communicate with outside network using Sgi Interface.Each PDN is identified by APN(Access Point Name).
PCRF(Policy Control and Charging Rules):
The interface between the serving and PDN gateways is known as S5/S8. s5 if two devices in same network s8 if devices in differenet network.
For VolteIMS Prospective two nodes are important in EPC
IMS Core:
IMS Core handles session management and media control.
IMS Core has following nodes:-
CSCF: Establishes monitor ,supports and releases multimedia sessions.
PCSCF : it is intial point of contact for any SIP UA,it handles all request from UE.
SCSCF: has knowledge about user and what applications are available for user.SCSCF decides wheter sip messages should go to application server or not.
ICSCF: ICSCF query with HSS and assign the SCSCF to the user
HSS:
HSS is a database that maintains user profiles and location information.HSS is also responsible for authentication and authorization.
SLF: Subscriber location Function) assigns HSS to user in home network. to acheive func it keep track of all HSS.
It is the mobile terminal authorized to be used in and LTE Network.
An IMS Powered UE :
It required two components:-
UICC (Universal Intergrated circuit card):
UE must contain one UICC and UICC may have one or more modules .
SIM: used by GSM network
USIM: Used by UMTS or LTE network
CSIM: used by CDMA neytwork
ISIM: used by IMS network .It contains IMPI(IP Multimedia Private Identity) , IMPU(IP multimedia Public identity) and secret key . IMPI is global identity given by home network. IMPU acts like telephone number or SIP URI.Secret key is used for user authentication and sip registration.
SIP UA (SIP USerAgent)
its acts as UAS and UAC
EnodeB:
The E-UTRAN handles the radio communications between the mobile and the evolved packet core( EPC)and just has one component, the evolved base stations, called eNodeB.
Each eBN connects with the EPC by means of the S1 interface used for signalling and it can also be connected to nearby base stations by the X2 interface for packet forwarding during handover.
EPC (Evolved Packet Core):
MME:
mobility management entity (MME) controls the high-level operation of the mobile by means of signalling messages and Home Subscriber Server (HSS).
HSS:
The Home Subscriber Server (HSS) component is a central database that contains information about all the network operator's subscribers.
SGW(Serving Gateway):
Acts as a router, and forwards data between the base station and the PDN gateway.
PGW(PDN Gateway):
Packet Data Network Gateway communicate with outside network using Sgi Interface.Each PDN is identified by APN(Access Point Name).
PCRF(Policy Control and Charging Rules):
The interface between the serving and PDN gateways is known as S5/S8. s5 if two devices in same network s8 if devices in differenet network.
For VolteIMS Prospective two nodes are important in EPC
IMS Core:
IMS Core handles session management and media control.
IMS Core has following nodes:-
CSCF: Establishes monitor ,supports and releases multimedia sessions.
PCSCF : it is intial point of contact for any SIP UA,it handles all request from UE.
SCSCF: has knowledge about user and what applications are available for user.SCSCF decides wheter sip messages should go to application server or not.
ICSCF: ICSCF query with HSS and assign the SCSCF to the user
HSS:
HSS is a database that maintains user profiles and location information.HSS is also responsible for authentication and authorization.
SLF: Subscriber location Function) assigns HSS to user in home network. to acheive func it keep track of all HSS.
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