LTE MME Function

MME (Mobility Management Entity) adalah signaling utama node  dalam EPC, yang bertanggung jawab untuk memulai paging signal dan authentication pada mobile device . 

hal ini juga menyimpan informasi lokasi pada tracing area level pada setiap user dan mempengaruhi dalam hal memilih gateway yg sesuai selama proses awal regristrasi , MME tersambung ke eNB  melalui S1-MME interface dan terhubung ke S-GW via S11 interface, 

multiple MME bisa di kelompokan bersama di dalam satu pool untuk mencapai peningkatan load signaling load pada jaringan, dan MME juga memainkan peranan penting dalam menghubungkan signaling antara LTE dan 2G/3G network 

Fungsi MME secara garis besar dapat disebutkan sebagai berikut ;

NAS signalling

NAS signalling security

AS Security control 

Inter CN node signalling for mobility between 3GPP access networks

Idle mode UE Reachability (including control and execution of paging retransmission)

Tracking Area list management (for UE in idle and active mode)

PDN GW and Serving GW selection

MME selection for handovers with MME change

SGSN selection for handovers to 2G or 3G 3GPP access networks

Roaming

Authentication

Bearer management functions including dedicated bearer establishment

Support for PWS (which includes ETWS and CMAS) message transmission

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LTE eNB Functions

Berdasarkan overview dari dokumen 3GPP relase 8 , eNB host mempunyai fungsi sebagai berikut;

• Radio Resource Management
• Radio Barrier Control
• Radio Admission Control
• Connection Mobility Control
• Dynamic Allocation of resource to UE's in both up link and down link (scheduling)

• IP header compression and encryption pada aliran data user
• Selection of an MME at UE attachment  when no routing to an MIME can determined from the information provided by the UE
• Routing of user plane data towards serving gateway
• Scheduling and transmission of paging message (originate from the MME)
• Scheduling and transmission of broadcast information (originate from  the MME or O&M )
• Measurement and measurement reporting  configuration for mobility and scheduling.

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