4G Cell Broadband - LTE Network Architecture and Protocol Stack

ABSTRCT

The target?defense pdu from the LTE normal is always to create requirements to get a new radio-access technological innovation geared to increased details rates, small latency and greater spectral effectiveness. The spectral performance concentrate on with the LTE technique is three to four times better compared to the recent HSPA program. These intense spectral effectiveness targets involve working with the engineering envelope by using highly developed air-interface techniques for example low-PAPR orthogonal uplink several entry dependant on SC-FDMA(single-carrier frequency division numerous obtain) MIMO multiple-input multiple-output multi-antenna technologies, inter-cell interference mitigation techniques, minimal latency channel construction and single-frequency community (SFN) broadcast. The scientists and engineers working on the normal occur up with new progressive technological know-how proposals and ideas for method effectiveness advancement. Because of the very aggressive typical enhancement timetable, these scientists and engineers are usually not able to publish their proposals in conferences or journals, etc. Inside the standards progress period, the proposals go through substantial scrutiny with various resources analyzing and simulating the proposed technologies from procedure functionality enhancement and implementation complexity perspectives. Hence, only the highest-quality proposals and ideas eventually make to the typical.

Key phrases: LTE Architecture, UDP, GDP, MIMO, MIME, MCCH, MBMS, QOS

1. INTRODUCYION

The LTE network architecture is developed using the intention of supporting packet-switched site visitors with seamless mobility, quality of services (QoS) and nominal latency. A packet-switched approach lets for that supporting of all solutions such as voice by way of packet connections. The result inside of a really simplified flatter architecture with only two types of node namely developed Node-B (eNB) and mobility management entity/gateway (MME/GW). That is in distinction to a lot of more community nodes during the present-day hierarchical network architecture of the 3G process. One important alter is usually that the radio community controller (RNC) is eliminated from the details route and its features are now included in eNB. Some of the benefits of a single node within the entry network are lessened latency as well as the distribution with the RNC processing load into many eNBs. The elimination with the RNC from the entry community was doable partly for the reason that the LTE system will not help macro-diversity or soft-handoff.

two. LTE Network ARCHITECTURE

Every one of the network interfaces are based on IP protocols. The eNBs are interconnected by the use of an X2 interface also to the MME/GW entity via an S1 interface as revealed in Figure1. The S1 interface supports a many-to-many relationship between MME/GW and eNBs.

The purposeful split amongst eNB and MME/GW is demonstrated in Determine 2 Two rational gateway entities particularly the serving gateway (S-GW) and also the packet facts network gateway (P-GW) is outlined. The S-GW acts as being a neighborhood mobility anchor forwarding and receiving packets to and from the eNB serving the UE. The P-GW interfaces with exterior packet information networks (PDNs) including the Online and the IMS. The P-GW also performs quite a few IP functions such as deal with allocation, plan enforcement, packet filtering and routing.

The MME is a signaling only entity and therefore consumer IP packets will not go through MME. An advantage of the different community entity for signaling is that the community capacity for signaling and website traffic can increase independently. The principle functions of MME are idle-mode UE get to skill such as the manage and execution of paging retransmission, tracking spot listing administration, roaming, authentication, authorization, P-GW/S-GW range, bearer administration including devoted bearer institution, safety negotiations and NAS signaling, and so forth.