4G Mobile Broadband - LTE Network Architecture and Protocol Stack

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ABSTRCT

The objective?http://www.raptorpowersystems.com/pdu-s with the LTE typical will be to make technical specs for a new radio-access engineering geared to higher details charges, minimal latency and bigger spectral efficiency. The spectral effectiveness target for the LTE technique is a few to 4 periods better compared to recent HSPA technique. These intense spectral efficiency targets have to have working with the engineering envelope by utilizing state-of-the-art air-interface tactics for instance low-PAPR orthogonal uplink many accessibility based on SC-FDMA(single-carrier frequency division a number of accessibility) MIMO multiple-input multiple-output multi-antenna systems, inter-cell interference mitigation methods, reduced latency channel composition and single-frequency community (SFN) broadcast. The researchers and engineers working on the standard come up with new progressive technological innovation proposals and ideas for technique effectiveness enhancement. On account of the highly aggressive standard improvement schedule, these scientists and engineers are usually not able to publish their proposals in conferences or journals, and many others. In the expectations progress phase, the proposals endure in depth scrutiny with various sources evaluating and simulating the proposed technologies from technique functionality advancement and implementation complexity views. Consequently, only the highest-quality proposals and concepts at last make in to the regular.

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

1. INTRODUCYION

The LTE network architecture is designed using the purpose of supporting packet-switched traffic with seamless mobility, high-quality of support (QoS) and nominal latency. A packet-switched solution allows for that supporting of all solutions which include voice as a result of packet connections. The result inside of a hugely simplified flatter architecture with only two types of node particularly progressed Node-B (eNB) and mobility administration entity/gateway (MME/GW). This is certainly in distinction to many a lot more community nodes during the present-day hierarchical network architecture of your 3G procedure. 1 big transform is always that the radio community controller (RNC) is removed within the information path and its functions are actually incorporated in eNB. A number of the advantages of a one node inside the obtain community are decreased latency and also the distribution with the RNC processing load into multiple eNBs. The elimination with the RNC within the accessibility network was feasible partly since the LTE system will not support macro-diversity or soft-handoff.

2. LTE Network ARCHITECTURE

Each of the community interfaces are based on IP protocols. The eNBs are interconnected by way of an X2 interface also to the MME/GW entity through an S1 interface as demonstrated in Figure1. The S1 interface supports a many-to-many marriage among MME/GW and eNBs.

The purposeful break up involving eNB and MME/GW is proven in Figure two Two sensible gateway entities particularly the serving gateway (S-GW) and the packet info community gateway (P-GW) is outlined. The S-GW functions being a area mobility anchor forwarding and receiving packets to and from your eNB serving the UE. The P-GW interfaces with exterior packet facts networks (PDNs) including the World-wide-web along with the IMS. The P-GW also performs many IP capabilities including tackle allocation, plan enforcement, packet filtering and routing.

The MME is often a signaling only entity and hence user IP packets do not endure MME. An advantage of a independent community entity for signaling is always that the network potential for signaling and site visitors can increase independently. The principle features of MME are idle-mode UE access potential including the regulate and execution of paging retransmission, tracking area list management, roaming, authentication, authorization, P-GW/S-GW range, bearer administration including committed bearer establishment, safety negotiations and NAS signaling, and many others.