4G Cell Broadband - LTE Network Architecture and Protocol Stack

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ABSTRCT

The goal?http://www.raptorpowersystems.com/pdu-s with the LTE regular is usually to build specs for any new radio-access technology geared to bigger info premiums, reduced latency and increased spectral performance. The spectral efficiency concentrate on for the LTE program is a few to four moments larger compared to present-day HSPA method. These aggressive spectral efficiency targets need employing the technologies envelope by using highly developed air-interface approaches which include low-PAPR orthogonal uplink various accessibility dependant on SC-FDMA(single-carrier frequency division numerous access) MIMO multiple-input multiple-output multi-antenna systems, inter-cell interference mitigation methods, reduced latency channel structure and single-frequency community (SFN) broadcast. The scientists and engineers focusing on the regular come up with new ground breaking technology proposals and ideas for technique overall performance advancement. Because of the extremely aggressive normal improvement agenda, these researchers and engineers are generally not able to publish their proposals in conferences or journals, and so forth. In the criteria advancement period, the proposals experience intensive scrutiny with many resources assessing and simulating the proposed systems from procedure efficiency improvement and implementation complexity views. Therefore, just the highest-quality proposals and concepts finally make in to the common.

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

one. INTRODUCYION

The LTE community architecture is built along with the purpose of supporting packet-switched traffic with seamless mobility, good quality of company (QoS) and minimum latency. A packet-switched tactic allows for that supporting of all providers which include voice through packet connections. The end result in the very simplified flatter architecture with only two types of node namely evolved Node-B (eNB) and mobility management entity/gateway (MME/GW). This really is in contrast to lots of extra community nodes within the existing hierarchical community architecture from the 3G procedure. One main alter is that the radio community controller (RNC) is removed in the facts path and its capabilities are now incorporated in eNB. Several of the advantages of the one node during the obtain network are diminished latency and the distribution in the RNC processing load into various eNBs. The elimination on the RNC inside the obtain community was attainable partly since the LTE method will not help macro-diversity or soft-handoff.

two. LTE Network ARCHITECTURE

The many network interfaces are determined by IP protocols. The eNBs are interconnected by means of an X2 interface and also to the MME/GW entity by the use of an S1 interface as shown in Figure1. The S1 interface supports a many-to-many connection concerning MME/GW and eNBs.

The practical split in between eNB and MME/GW is proven in Figure 2 Two sensible gateway entities namely the serving gateway (S-GW) along with the packet knowledge community gateway (P-GW) is described. The S-GW functions like a regional mobility anchor forwarding and obtaining packets to and with the eNB serving the UE. The P-GW interfaces with external packet knowledge networks (PDNs) such as the World-wide-web as well as the IMS. The P-GW also performs various IP features for example handle allocation, plan enforcement, packet filtering and routing.

The MME is really a signaling only entity and therefore consumer IP packets tend not to undergo MME. A benefit of a individual community entity for signaling is the fact that the community ability for signaling and targeted traffic can increase independently. The most crucial capabilities of MME are idle-mode UE access means including the control and execution of paging retransmission, monitoring area checklist administration, roaming, authentication, authorization, P-GW/S-GW variety, bearer administration such as dedicated bearer institution, safety negotiations and NAS signaling, and so forth.