Smart Integrated Systems-Articles

Publications

Team Publications include the following topics:

  1. Sensorial Systems
  2. Communication Systems and Networks
  3. Simulation and Visualization Environments

 

Development of a Middleware to support adaptive selection of heterogeneous networks based on QoS and performance criteria

Scope:

The scope of the diploma thesis involves the design and development of a middleware to facilitate various types of files exchange from a folder or DB over heterogeneous fixed and mobile networks towards a remote location. The focus is given on implementing a certain logic that considers QoS and performance criteria of the utilised networks.

Within the diploma thesis there will be capturing of the standardised QoS and performance requirements of various mobile and wired technologies such as: GPRS, UMTS, HSPA, LTE, SATCOM, TETRA, Wi-Fi, WiMAX, ADSL and VDSL. The requirements shall consider various paradigms of underlying access and transport networks. For each technology, simulations will be performed (OPNET, NS-2, NS-3) considering a simple architecture with minimum nodes (e.g. 2 or 3) under best, medium and worst case scenarios to conclude with QoS and performance thresholds that allow uncorrupted file exchange.

Based on the results above, middleware logic will be developed and implemented on a virtual machine capable of receiving in parallel multiple inputs of network behavior (i.e. simulation above) and assign the optimum access path for files of variable size to be exchanged from source to destination. A non-exhaustive list of QoS and performance criteria follows:

  • Throughput-The rate at which the packets go through the network. Maximum rate is always preferred.
  • Delay-This is the time which a packet takes to travel from one end to the other. Minimum delay is always preferred.
  • Packet Loss Rate-The rate at which a packet is lost. This should also be as minimum as possible.
  • Packet Error Rate-This is the errors which are present in a packet due to corrupted bits. This should be as minimum as possible
  • Reliability-The availability of a connection. (Links going up/down).

 

Required:

  • Mobile Communications and Networks, Multimedia Services
  • Java, C++

 

The successful completion of the below courses will be considered an asset:

ΚΟΡΜΟΥ:  Προγραμματιστικές Τεχνικές , Εισαγωγή στην Επιστήμη των Υπολογιστών

ΡΟΗ Υ: ΥΠΟΛΟΓΙΣΤΙΚΑ ΣΥΣΤΗΜΑΤΑ - Τεχνολογία Πολυμέσων, Τεχνολογία και Ανάλυση Εικόνων και Βίντεο

ΡΟΗ Λ: ΛΟΓΙΣΜΙΚΟ Η/Υ  - Γλώσσες Προγραμματισμού Ι , Γλώσσες Προγραμματισμού ΙΙ ,

ΡΟΗ Δ: ΕΠΙΚΟΙΝΩΝΙΕΣ ΚΑΙ ΔΙΚΤΥΑ ΥΠΟΛΟΓΙΣΤΩΝ  - Δίκτυα Επικοινωνιών, Δίκτυα Υπολογιστών, Ψηφιακή Τηλεόραση και Επικοινωνίες Πολυμέσων, Δίκτυα Κινητών και Προσωπικών Επικοινωνιών, Διαδίκτυο και Εφαρμογές, Εξομοίωση Συστημάτων Επικοινωνιών, Δίκτυα Ευρείας Ζώνης

ΡΟΗ Τ: ΚΥΜΑΤΑ ΚΑΙ ΤΗΛΕΠΙΚΟΙΝΩΝΙΕΣ  - Συστήματα Κινητών Τηλεπικοινωνιών, Δορυφορικές Επικοινωνίες

 

Supervisors:

Νικόλαος Ουζούνογλου nuzu@cc.ece.ntua.gr

Άγγελος Αμδίτης angelos@esd.ece.ntua.gr


Further info: Αθανασία Τσέρτου atsertou@iccs.gr, Ευάγγελος Σδόγγος esdongos@iccs.gr

Study and simulations on TCP Algorithms, QoS and Packet Scheduling techniques to increase performance for LTE and Satellite networks (focus on the critical communications perspective)

Scope:

LTE and LTE advanced have tremendously altered today’s arena of mobile communications in terms of satisfying enormous throughputs maintaining at the same time acceptable (cost-wise and subscribers-wise) coverage schemas. At the same time a contralateral background is present for the satellite communications which remain closed systems for dedicated purposes and albeit their wide coverage and broadband capabilities technical challenges still remain to ensure their integration with public next generation wireless systems. The above standards highly employ the Transmission Control Protocol over the underlying networks to facilitate reliable transfer of  the large loads of data with multimedia functions. However, TCP’s behavior is still subjected to optimisation so that throughput, latency and delay guarantee the highest possible degree of trust for the users that communicate and exchange total conversation data (i.e. voice, text, video) as well as request for next generation services such as proximity services and M2M interaction. smartintegratedsystems1At the same time QoS compromisation is presente when the above technoclogies interwork. The latter attributes are determined by various parameters such as TCP window size, Round-Trip-Time and loss probability, to name a few.

Apart from TCP algortihms, QoS and packet sceduling schemes have been studied from the infantry of packet switched data exchange (i.e.PRIO, LIFO, RR). However, simply applying those or the modern ones (i.e. HFQ, HFS, WFQ, etc.) in the newly introduced LTE networks do not provide the optimum results to satisfy QoS requirements in terms of bandwidth, delay, jitter, bit error rate, fairness, etc. For the satellite links long and variable RTT combined with high BER affect the respective TCP performance.

Enhancements on the previous parameters are expected on one hand to increase QoS from PHY to Application layer (i.e. from packet transmission fairness to QoE) for the conventional public mobile next generation communications and the potential interworking with SATCOM while on the other hand would encourage the wide adoption of these technologies from the PPDR community that pays significant attention to communication attributes dealing with delay and reliability.

Within this diploma thesis it is expected to study the TCP algorithms and the packet scheduling techniques applied to LTE, LTE advanced and Satellite networks and comparatively set up simple network simulations (e.g. NS2/NS3, OPNET, QRM, TEMPEST, C2ML) towards recommendations on novel schemas that increase QoS.

Required:

  • Mobile/Satellite Communications and Networks, Multimedia Services
  • Unix

 

The successful completion of the below courses will be considered an asset:

ΚΟΡΜΟΥ:  Προγραμματιστικές Τεχνικές , Εισαγωγή στην Επιστήμη των Υπολογιστών

ΡΟΗ Λ: ΛΟΓΙΣΜΙΚΟ Η/Υ  - Γλώσσες Προγραμματισμού Ι

ΡΟΗ Δ: ΕΠΙΚΟΙΝΩΝΙΕΣ ΚΑΙ ΔΙΚΤΥΑ ΥΠΟΛΟΓΙΣΤΩΝ  - Δίκτυα Επικοινωνιών, Δίκτυα Υπολογιστών, Ψηφιακή Τηλεόραση και Επικοινωνίες Πολυμέσων, Δίκτυα Κινητών και Προσωπικών Επικοινωνιών, Διαδίκτυο και Εφαρμογές, Εξομοίωση Συστημάτων Επικοινωνιών, Δίκτυα Ευρείας Ζώνης

ΡΟΗ Τ: ΚΥΜΑΤΑ ΚΑΙ ΤΗΛΕΠΙΚΟΙΝΩΝΙΕΣ  - Συστήματα Κινητών Τηλεπικοινωνιών, Δορυφορικές Επικοινωνίες


Supervisors:

Νικόλαος Ουζούνογλου nuzu@cc.ece.ntua.gr

Άγγελος Αμδίτης angelos@esd.ece.ntua.gr

 

Further info: Αθανασία Τσέρτου atsertou@iccs.gr, Ευάγγελος Σδόγγος esdongos@iccs.gr