![]() ![]() Reliable Data Delivery: Delivers sequenced data in a stream (Elimination of head-of-line blocking): SCTP ensures the sequenced delivery of data with multiple unidirectional streams, without blocking the chunks of data in other direction.A SCTP association can have multiple addresses at each end. Association setup: An association is a connection that is set up between two endpoints for data transfer, much like a TCP connection. ![]() SCTP provides reliable delivery on top of the existing IP framework. SCTP (Stream Control Transmission Protocol)is a transport protocol that uses the services of Internet Protocol (IP) to provide a reliable datagram delivery service to the adaptation modules, such as the S1AP.The integrated S1 MME interface stack consists of IP, SCTP, S1AP. MME supports the S1 interface with eNodeB. This stack consists of the S1-MME stack, which supports S1-MME interface with eNodeB, and the S11 stack, responsible for supporting the S11 interface with Serving Gateway. Within the EPC protocol stack are unique, and identifiable MME protocols. This achieves load balancing between S-GWs. Load Balancing Between S-GWs: Directs UEs entering an S-GW pool area to an appropriate S-GW.Lawful Intercept: Since MME manages the control plane of the network, MME can provide the whereabouts of a UE to a law enforcement monitoring facility.Tracking Area Management: Allocates and reallocates a tracking area identity list to the UE.UE Reach-ability: MME manages communication with the UE and HSS to provide UE reach-ability and activity-related information.Roaming Management: MME supports outbound and inbound roaming subscribers from other LTE/EPC systems and legacy networks.The use cases become more complex depending on a change in MME, S-GW, P-GW or inter-working across other wireless networks. Providing seamless inter-working has multiple use cases such as Inter-eNB and Inter-RAT, among others. Mobility Management: One of the most complex functions MME performs.Radio Resource Management: MME works with the HSS and the RAN to decide the appropriate radio resource management strategy (RRM) that can be UE-specific.It also facilitates UE access to the network to gain IP connectivity. Network Access Control: MME manages authentication and authorization for the UE.In whitepaper Mobility Management Entity in LTE EPC Networks, tellabs also highlights MME as the main control node in the LTE access network and breaks down MME’s critical functions and interfaces as follows: MME also plays a vital part in handover signaling between LTE and 2G/3G networks. Multiple MMEs can be grouped together in a pool to meet increasing signaling load in the network. MME connects to the evolved node b (eNB) through the S1-MME interface and connects to S-GW through the S11 interface. MME retains location information at the tracking area level for each user and then selects the appropriate gateway during the initial registration process. According to LTE University, LTE MME is responsible for initiating paging and authentication of the mobile device. In fact, MME is the main signaling node in the EPC. Mobility Management Entity (MME) plays an important role in LTE EPC architecture. The main component of the SAE architecture is the Evolved Packet Core (EPC). They must also adhere to the core network architecture of 3GPP’s LTE wireless communication standard, known as System Architecture Evolution (SAE). As mobile network operators and carriers transition into Long Term Evolution (LTE) technology, they are faced with the challenge of marrying a successful, running network with increased capacity demands. ![]()
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