01 RA41211EN30GLA0 RL30 Overview Ppt

8/12/2019 01 RA41211EN30GLA0 RL30 Overview Ppt

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LTE Functionalities & Features Overview

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HSS: Home subscriber server ( part of IMS)


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UDP: User Datagram Protocol ( L4 Transport Layer) . Similar to TCP but onlyprovides connectionless service.


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SCTP: Stream Control Transmission Protocol. For IP signalling. Ensures reliable, in-sequence transport of messages with congestion control Similar to TCP but withadvantages:

Multi-homing support, where one (or both) endpoints of a connection can consist ofmore than one IP address, enabling transparent fail-over between redundant networkpaths.

Transaction-oriented, it transports data in one or more messagesinstead of in bytestreams ( TCP)

GTP: GPRS Tunnelling Protocol ( same as for UMTS Rel 99): user plane traffic


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Downlink

Normal Cyclic Prefix considered and 10MHz BW

Following overheads not reduced: CRC, L2/L3 headers, IP headers

Following overheads reduced

Synchronization, reference, PBCH, PCFICH, PHICH and 1 PDCCH symbol

Relative overheads

Reference symbol overhead 9.5% with 2x2 MIMO

PDCCH overhead 4.76% with single symbol (two symbols with 1.4MHz)(12*Numpdcch symbol-4*RS)/(12*7*2subframes)

Other overheads


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01 RA41211EN30GLA0 RL30 Overview Ppt

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