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Project Background

Long Term Evolution represents an emerging and promising technology for providing a broadband ubiquitous Internet access. For this reason, several research groups are working on LTE to provide newer and innovative solutions, able to optimize its performance.

Unfortunately, no ns-3 modules have been developed to simulate LTE networks. This project consist of a development of a framework to simulate LTE networks on ns-3, composed by both PHY and MAC models.


The development of the LTE module for ns-3 is composed by two consecutive steps. The first one is the development of the PHY model and the second one is the development of the MAC mode. The module will be implemented into the src/device/lte folder.

Regarding the PHY model, starting from the Nicola's spectrum framework proposed in [1] will be implemented the following features: (i) a new PHY spectrum for the LTE, (ii) the LTE spectrum model, and (iii) the LTE propagation Loss model. For the PHY model, a couple of half-duplex PHY will be defined, one for the downlink and one for the uplink. In this way it is possible to provide the support for the FDD channel access. The LTE spectrum model will take into the account that the whole LTE bandwidth (20Mhz @ 2GHz) is divided into 100 sub channel of 180 KHz. The the LTE propagation Loss model will be used to obtain the received spectrum spectrum. According to [2], four models (shadowing, multipath, path loss, and penetration loss) will be chained into a single model. For wath concern the spactrum channel, it will be used the SingleModelSpectrum Channel proposed with the spectrum framework.

Regarding the MAC model, the LTE network devices (eNB and UE) will be implemented. For each device will be defined the following elements: (i) the LTE Spectrum Physical, (ii) the AMC Module, (iii) the Bearer Manager. For the eNB will be defined also the following elements: (i) Downlink Scheduler, (ii) Frame Manager, and (iii) list of registered UE. A bearer class will be implemented to manage one LTE flow between eNB and UE. For each Bearer a MAC queue will be also developed.