All posts by Azar

WHAT PROTOCOLS ARE INVOLVED IN THE CONTROL PLANE OF LTE ? CAN YOU EXPLAIN THEIR FUNCTIONALITY BRIEFLY ?

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The question is specifically asking about the LTE Control plane protocols from the Radio Interface perspective. Therefore, lets focus specifically on the radio interface including the control plane protocols involved as shown below. The protocols from the RAN perspective in control plane are shown above. The brief functionality of each of the protocol layer is […]

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WHAT IS THE ENODE-B FUNCTIONALITY?

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eNodeB is the RAN node in the EPS architecture that is responsible for radio transmission and reception from UEs in one or more cells.The eNode B is connected to Core Network nodes by means of an S1 interface. The eNodeB may also be connected to its neighbor eNdoeBs by means of the X2 interface. The […]

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WHY DO WE NEED POOLING OF MME AND S-GW?

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Pooling is mainly used to avoid network and node failures. In order to eliminate the risk,that one node failure may cause parts of the network to be out of service. This is only possible because of many to many relation interfaces between eNodeBs and core network nodes, where each eNode B is associated with a […]

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WHAT IS THE FUNCTIONALITY OF THE P/S-GW NODE?

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The P/S-GW is the anchor point for the user plane for a UE moving between eNode Bs. The S-GW is only changed when the UE move to a new S-GW pool area while the P-GW is normally kept as long as the UE is attached to the network. Functionality of P/S-GW functionality is very similar […]

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WHAT IS THE FUNCTIONALITY OF THE MME NODE?

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MME is a dictator node. Even though it exist only in the core network. It’s responsibilities are pretty diverse. It has core network control functionality. The control plane protocols terminate at the MME. It also manages the mobility contexts (Either in Idle or connected mode) of the UEs Same MME remains in control of a UE as long as the […]

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