LTE: All Network Element functions in one
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This slide is compilation of functions of all the network elements in one slide.
![Policy and Charging Rule functions
(PCRF)
• QoS policy negotiation with PDN
• Charging Policy: determines hoe
packets should be accounted
• PCRF to provide Policy Charging
Control every time a new bearer,
has to be set up
Packet Data Network (PDN) SAE Gateway
• Mobility anchor for mobility between 3GPP access
systems and non-3GPP
• access Systems. This is sometimes referred to as the SAE
Anchor function
• policy & Charging Enforcement (PCEF)
• Per user based Packet Filtering (i.e. deep packet
inspection)
• Charging Support
• Lawful Interception support
• IP Address Allocation for UE
• Packet Routing/Forwarding between Serving GW and
external Data Network
• Packet screening (firewall functionality)
Serving SAE Gateway
• Local Mobility Anchor Point: Switching the user plane to a new eNB in case of
Handover
• Mobility anchoring for inter-3GPP mobility. This is sometimes referred to as the
3GPP Anchor function
• Packet Buffering and-notification to MME for UEs in Idle Mode
• Packet Routing/Forwarding between eNB, PDN GW and SGSN
• It support Lawful interception and Charging functionalities
MME Functions
• Control Plane NE in EPC , Non-Access-Stratum (NAS) Signalling
• Idle State Mobility Handling
• Tracking Area updates .Subscriber attach/detach
• Signalling coordination for SAE Bearer setup/Release & HO
• Security (Authentication, Ciphering, integrity protection)
• Trigger and distribution of Paging Messages to eNB
• Roaming Control (S6a interface to HSS)
• Inter-CN Node Signalling (S10 interface), allows efficient inter -MME tracking area
updates and handovers
Home Subscriber Server (HSS)
• Permanent and central subscriber database
• Stores mobility and service data for every
subscriber
• Contains the Authentication Centre (AuC)
functionality
eNB/LTE
• Radio resource management(RRM)
• Radio bearer control: Setup, modification & release of radio resources
• Connection management control: UE state mgmt., MME-UE connection
• Radio admission control
• eNB measurements collection & evaluation
• Dynamic resource allocation (Scheduler)
• IP Header compression/ de-compression[IP Header Compression/De-
compression: the purpose of this technique is to avoid sending
repetitively the same or sequential data in the IP header. ]
• Access layer security: ciphering & integrity protection on the radio
interface
• MME selection at attach of UE
• User data routing to the SAE GW
• Transmission of paging message coming from MME
• Transmission of broadcast info (system info, MBMS)
LTE NE functions](https://image.slidesharecdn.com/lteneall-160708130740/85/LTE-All-Network-Element-functions-in-one-1-320.jpg)
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LTE: All Network Element functions in one
- 1. Policy and Charging Rule functions (PCRF) • QoS policy negotiation with PDN • Charging Policy: determines hoe packets should be accounted • PCRF to provide Policy Charging Control every time a new bearer, has to be set up Packet Data Network (PDN) SAE Gateway • Mobility anchor for mobility between 3GPP access systems and non-3GPP • access Systems. This is sometimes referred to as the SAE Anchor function • policy & Charging Enforcement (PCEF) • Per user based Packet Filtering (i.e. deep packet inspection) • Charging Support • Lawful Interception support • IP Address Allocation for UE • Packet Routing/Forwarding between Serving GW and external Data Network • Packet screening (firewall functionality) Serving SAE Gateway • Local Mobility Anchor Point: Switching the user plane to a new eNB in case of Handover • Mobility anchoring for inter-3GPP mobility. This is sometimes referred to as the 3GPP Anchor function • Packet Buffering and-notification to MME for UEs in Idle Mode • Packet Routing/Forwarding between eNB, PDN GW and SGSN • It support Lawful interception and Charging functionalities MME Functions • Control Plane NE in EPC , Non-Access-Stratum (NAS) Signalling • Idle State Mobility Handling • Tracking Area updates .Subscriber attach/detach • Signalling coordination for SAE Bearer setup/Release & HO • Security (Authentication, Ciphering, integrity protection) • Trigger and distribution of Paging Messages to eNB • Roaming Control (S6a interface to HSS) • Inter-CN Node Signalling (S10 interface), allows efficient inter -MME tracking area updates and handovers Home Subscriber Server (HSS) • Permanent and central subscriber database • Stores mobility and service data for every subscriber • Contains the Authentication Centre (AuC) functionality eNB/LTE • Radio resource management(RRM) • Radio bearer control: Setup, modification & release of radio resources • Connection management control: UE state mgmt., MME-UE connection • Radio admission control • eNB measurements collection & evaluation • Dynamic resource allocation (Scheduler) • IP Header compression/ de-compression[IP Header Compression/De- compression: the purpose of this technique is to avoid sending repetitively the same or sequential data in the IP header. ] • Access layer security: ciphering & integrity protection on the radio interface • MME selection at attach of UE • User data routing to the SAE GW • Transmission of paging message coming from MME • Transmission of broadcast info (system info, MBMS) LTE NE functions