System Architecture Evolution (SAE) is the network architecture and designed to simplify the network to other IP based communications network. SAE uses an eNB and Access Gateway (aGW) and removes the RNC and SGSN from the equivalent 3G network architecture, to make a simpler mobile network. This allows the network to be built as an “All-IP” based network architecture. SAE also includes entities to allow full inter-working with other related wireless technology (WCDMA, WiMAX, WLAN, etc.)
In LTE the architecture is differente from 3G network architecture :
E-NB ----------> BTS+BSC (IN 2G)
----------> RNC + NODE-B (IN 3G)
HSS-------------> HLR+AUC
P-GW------------> GMSC+GGSN
S-GW ------------->MSC+SGSN
MME-----------------> VLR
NOTE THAT : cs and ps components be in one component based on(( OVER IP TECHNOLOGY )).
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LTE from GSM and UMTS
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E-NB Functions
No RNC is provided anymore, The evolved Node Bs take over all radio management functionality.
This will make radio management faster and hopefully the network , architecture simpler
RBS 6201 LTE BS MOTOROLA
-At RX SC-FDMA demodulator
-channel coding (error correction and detection)
-radio frequency fuctions: 1- power amplifier 2-low noise amplifier
-segmentation
-ciphering and deciphering
-resources assignment
-channel deundancy schedule
-handover
-adaptive frequency function
-broadcatsting information
-paging
RRM, Radio Bearer Control, Radio Admission Control,Connection Mobility Control, Scheduling for uplink and downlink,IP header compression and encryption of user data stream,Selection of an MME at UE attachment, Routing of user plane data towards SAE Gateway,Scheduling and transmission of paging messages originated from MME,Scheduling and transmission of broadcast information originated
from MME or O&M, Measurement and measurement reporting configuration
Distribution of paging messages to eNBs
Security parameters Control
Idle state mobility control attach and detach for user
location area update
Ciphering and integrity protection of NAS Signaling وThe non-access stratum (NAS) protocol terminated in the MME on the network side and at the UE on the terminal side performs functions such as EPS (evolved packet system) bearer management,authentication and security control
Mobility Management. Provides the necessary support for subscriber mobility within the network, as well as support for mobility between networks. It keeps track of the current location of all subscribers including the states of their user device.
S-GW FUNCTIONS
serving gate way : serving of subscribers in there location
route users packets in the network and to packet gateway
serving the user in ip assignment
S-GW (Serving Gateway) is responsible for the transport, forwarding and route switch over of LTE user data.
-channel coding (error correction and detection)
-radio frequency fuctions: 1- power amplifier 2-low noise amplifier
-segmentation
-ciphering and deciphering
-resources assignment
-channel deundancy schedule
-handover
-adaptive frequency function
-broadcatsting information
-paging
RRM, Radio Bearer Control, Radio Admission Control,Connection Mobility Control, Scheduling for uplink and downlink,IP header compression and encryption of user data stream,Selection of an MME at UE attachment, Routing of user plane data towards SAE Gateway,Scheduling and transmission of paging messages originated from MME,Scheduling and transmission of broadcast information originated
from MME or O&M, Measurement and measurement reporting configuration
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MME FUNCTIONS :Distribution of paging messages to eNBs
Security parameters Control
Idle state mobility control attach and detach for user
location area update
Ciphering and integrity protection of NAS Signaling وThe non-access stratum (NAS) protocol terminated in the MME on the network side and at the UE on the terminal side performs functions such as EPS (evolved packet system) bearer management,authentication and security control
poling mode : this mode to connect all MME S together
S-GW FUNCTIONS
serving gate way : serving of subscribers in there location
route users packets in the network and to packet gateway
serving the user in ip assignment
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PDN -GW FUNCTIONS
packet data network gateway interfaces the network to external networks , responsible ip versions it makes packet filtering .
manages the connection of mobile terminal and external packet data network. It allocates IP address for terminal and is responsible for the egress route of user service data. Besides, it works as the anchor point inside mobile network, and always keeps service continuity. when user moves.
HOME SUBSCRIBER SERVER(HSS)
Centrlal dta base for the home network , generate security parameters, delivery of user information to MME at initial registration ,policy and charging resources function, it manages user subscription and authentication information .
FINALLY :
ecns600 core network
The Enterprise Core Network System 600 (eCNS600) is developed by Huawei for the enterprise Evolved Packet Core (EPC), and it applies only to the Long Term Evolution (LTE)/System Architecture Evolution (SAE) architecture. It integrates the subscriber management functions of the SAE-HSS, the Mobility Management Entity (MME) functions, and the Serving Gateway (S-GW)/PDN Gateway (P-GW) and Policy and Charging Rules Function (PCRF) functions. The eCNS600 is operated and maintained in a centralized manner.
thanks
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