4G Mobile Broadband - LTE Network Architecture and Protocol Stack

ABSTRCT

The purpose?http://www.raptorpowersystems.com/pdu-s with the LTE standard is to generate specifications to get a new radio-access know-how geared to better info costs, small latency and better spectral efficiency. The spectral performance concentrate on to the LTE procedure is 3 to 4 times increased compared to the present HSPA method. These aggressive spectral performance targets have to have applying the engineering envelope by using sophisticated air-interface strategies like low-PAPR orthogonal uplink a number of entry based upon SC-FDMA(single-carrier frequency division numerous entry) MIMO multiple-input multiple-output multi-antenna systems, inter-cell interference mitigation methods, very low latency channel construction and single-frequency network (SFN) broadcast. The scientists and engineers focusing on the standard arrive up with new progressive technologies proposals and concepts for technique overall performance enhancement. On account of the highly intense conventional enhancement timetable, these researchers and engineers are normally not able to publish their proposals in conferences or journals, and so forth. In the requirements growth phase, the proposals endure extensive scrutiny with multiple sources evaluating and simulating the proposed systems from process overall performance improvement and implementation complexity perspectives. As a result, just the highest-quality proposals and ideas eventually make in to the common.

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

one. INTRODUCYION

The LTE network architecture is intended along with the purpose of supporting packet-switched traffic with seamless mobility, excellent of services (QoS) and minimum latency. A packet-switched technique lets with the supporting of all services including voice by means of packet connections. The result inside of a remarkably simplified flatter architecture with only two kinds of node namely advanced Node-B (eNB) and mobility management entity/gateway (MME/GW). This is certainly in distinction to numerous extra community nodes while in the present hierarchical network architecture on the 3G method. A single major alter is the fact that the radio community controller (RNC) is eradicated within the data path and its functions at the moment are included in eNB. Some of the benefits of a single node during the entry network are lessened latency as well as distribution in the RNC processing load into many eNBs. The elimination in the RNC inside the obtain network was attainable partly due to the fact the LTE method would not aid macro-diversity or soft-handoff.

2. LTE Network ARCHITECTURE

Each of the network interfaces are based upon IP protocols. The eNBs are interconnected by way of an X2 interface and to the MME/GW entity via an S1 interface as revealed in Figure1. The S1 interface supports a many-to-many partnership concerning MME/GW and eNBs.

The useful break up involving eNB and MME/GW is revealed in Determine two Two rational gateway entities specifically the serving gateway (S-GW) plus the packet information community gateway (P-GW) is defined. The S-GW acts as being a community mobility anchor forwarding and acquiring packets to and within the eNB serving the UE. The P-GW interfaces with exterior packet information networks (PDNs) like the Internet and the IMS. The P-GW also performs quite a few IP capabilities for example handle allocation, policy enforcement, packet filtering and routing.

The MME is really a signaling only entity and therefore consumer IP packets tend not to go through MME. A benefit of a separate community entity for signaling is the fact the network ability for signaling and targeted visitors can grow independently. The principle functions of MME are idle-mode UE access capacity including the handle and execution of paging retransmission, monitoring area checklist management, roaming, authentication, authorization, P-GW/S-GW assortment, bearer management which include focused bearer institution, protection negotiations and NAS signaling, and many others.