ns-3 LTE模块ppt.pdf

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An LTE module for the Network Simulator 3 Giuseppe Piro, Nicola Baldo, Marco Miozzo - 25 March 2011 - Wns3 2011 – Barcelona (Spain)

Outline  About the Long Term Evolution (LTE)  Development of the LTE module for ns-3  Module description  Network devices (UE and eNB)  Radio Bearer Management and the RRC Entity  Channel and PHY models  AMC module and CQI feedbacks  Control Messages  Limitation and Future works 25 Mar. 2011 Wns3 2011

About the Long Term Evolution Long Term Evolution represents an emerging and promising technology for providing a broadband ubiquitous Internet access. First 3GPP release: Release 8 (Dec. 2004) (the “release of the release"is2008) LTE has been designed for guaranteeing high capacity and data rates, low cost deployments for cellular networks. LTE will be the 4-th generation of cellular networks. We need for a complete LTE simulator for testing network performance and for implementing newer 25 Mar. 2011 Wns3 2011 algorithms/protocols

Development of the LTE module for ns-3 The development of the LTE module for ns-3 was carried out during the Google Summer of Code 2010. The module is built completely in C++. It comprises 89 classes and approximately 9000 lines of code. The module has been merged into ns-3.10 ! LTE is a very complex standard, and for this reason, at this time, it is not yet possible the simulation a complete LTE system  However this contribution is fundamental since it set the basis for developing such a complete tool  25 Mar. 2011 Wns3 2011

LTE module description (1) What features have been implemented ?  Network devices: User Equipment (UE) and enhanced NodeB (eNB)  Part of Radio Resource Control (RRC)  MAC queues and the RLC instances (TM)  Data Radio Bearers (with their QoS parameters)  PHY layer model with Resource Block level granularity  Outdoor E-UTRAN channel model  DL Channel Quality Indicator (CQI) management  Adaptive Modulation and Coding (AMC) scheme for the downlink  Support for the downlink packet scheduler 25 Mar. 2011 Wns3 2011

LTE module description (2) Implemented E-UTRAN devices: UE and eNB. the LTE module is The core of composed by both MAC and PHY layers of an LTE device. The LTE device has been conceived as a container of several entities: the IP classifier, MAC entity, and the PHY layer. the RRC entity, the Their actual integration is device-dependent, due the intrinsic ifferences between the entities involved (UE vs. eNB). The implementation of each of these entities depends on which the device have to do. 25 Mar. 2011 Wns3 2011

The eNB network device UPPER LAYERS Classify packet into a proper queue IP Classifier ForwardUp Radio bearer RLC entity MAC queue AMC Packet Scheduler SendPacketBurst SendIdealControlMessages ReceiveIdealControlMessages DL PHY UL PHY RRC MAC PHY 25 Mar. 2011 Wns3 2011 DL Channel UL Channel

The UE network device UPPER LAYERS IP Classifier ForwardUp SendPacketBurst Radio bearer RLC entity MAC queue Create CQI feedbacks AMC SendIdealControlMessages ReceiveIdealControlMessages DL PHY UL PHY RRC MAC PHY 25 Mar. 2011 Wns3 2011 DL Channel UL Channel

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