All posts by Azar

WHAT IS THE COMPOSITION OF E-UTRAN?

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Evolved Universal Terrestrial Radio Access Network (E-UTRAN) or RAN side (LTE side) consists of eNode B nodes. eNodeB nodes are are connected to each other via the X2 interface. Both the S1 and the X2 interface can be divided into control plane and user plane  The S1 and X2 are multi-to- multi capable interfaces meaning […]

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WHAT IS THE COMPOSITION OF EPC?

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Evovled Packet Core (EPC) also known as core network is made up of control plane node called Mobility Management Entity (MME) and two other nodes named as Serving Gateway (SGW) and Packet Data Network abberviated as PGW. As shown below. Non-Roaming Case: In non-roaming case, the S-GW and P-GW functionalities are both located within one operators […]

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WHAT IS THE BEARER CONCEPT SUPPORTED BY THE EPS?

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The concept of Evolved Packet System (EPS) bearer in LTE exists for supporting end user data services. EPS bearer is defined between UE and Packet Data Network Gateway (P-GW) in the Evolved Packet Core (EPC). E-UTRA Radio Bearer and E-UTRAN Access Bearer From the diagram above , you can see EPS bearer is further sub-divided […]

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OVERALL EPS OVERVIEW: WHAT IS EPS?

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EPS Stands for Evolved Packet System (EPS) . It is made up of EPC(Core Network ) and E-UTRAN (RAN). As shown in the figure below. EPC High level Information The EPC provides access to external data networks. ( e.g., internet , corporate networks etc.) and operator services. It also performs services such as security related […]

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WHAT IS THE IMPACT TO L1/L2 CONTROL SIGNALLING FOR LTE TDD?

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First of all, the discontinuous transmission (DTX) on UL and DL will impact the timing relations, such as UL scheduling and HARQ. This in turn may have an impact on performance such as latency. The following major impacts are: UL grant addressing multiple UL sub-frames. This is a need for asymmetric configurations with more UL sub-frames […]

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