Access profile

The doctoral programme is designed for students who have taken master’s degrees in telecommunications or computer science and wish to examine a topic or area in greater depth to contribute knowledge. Although we could say that this is the ideal starting point, it is not the only one. Students with other educational backgrounds could also be accepted, although they may need to take bridging courses.

The doctoral programme is designed for people with technological interests who are creative and want to advance the state-of-the-art in the subject. This activity requires an attitude to technology that goes beyond user knowledge to reach an understanding of technology itself, which the doctoral student will know how to improve as a result. Doctoral studies have two benefits. First, they meet personal needs to understand things, and second they train the person, providing them with methodology and knowledge that they can use in their professional activity in positions that require technological creativity.

Research and development departments in companies or the creation of emerging companies are places where this knowledge could be exploited to the maximum.

The natural route into the doctoral programme is via the various master’s degrees in Telecommunications Engineering at the UPC taught by the ETSETB and the EETAC, in which case bridging courses are not required. For students from other master’s programmes, the academic committee of the doctoral programme will analyse applicants’ academic record and the area in which they will develop their thesis. Based on this information, the committee will decide whether students need to take bridging courses up to a maximum of 30 credits. As a general rule, students who hold a master’s degree in telecommunications (or an equivalent qualification) from other Spanish or European universities can access the research phase directly. Students with a master’s degree in computer science may be asked to take a bridging course in the subject area of telecommunication networks. Students who come from other master’s degrees should take additional credits so that they can gain the knowledge they need rapidly. The range of topics and approaches used to carry out the research makes it difficult to establish specific admission requirements (some theses have a high mathematics content, others are more focused on application). However, in general, knowledge of tools that can be used for performance evaluation will be assessed. Hence, applicants must be able to handle mathematical models, numerical methods, simulation tools such as ns-3, OMNET, Matlab or have knowledge of programming in Java, C++, C or Python for the construction of prototypes. Knowledge of written and spoken English is essential, as this is the language that will be used in the doctoral degree, for training, generation of publications and reports, and the exchange of knowledge with other researchers.

Output profile

Doctoral candidates who complete a doctoral degree will have acquired the following competencies, which are needed to carry out quality research (Royal Decree 99/2011, of 28 January, which regulates official doctoral studies):

a) A systematic understanding of the field of study and a mastery of the research skills and methods related to the field.
b) An ability to conceive, design or create, put into practice and adopt a substantial process of research or creation.
c) An ability to contribute to pushing back the frontiers of knowledge through original research.
d) A capacity for critical analysis and an ability to assess and summarise new and complex ideas.
e) An ability to communicate with the academic and scientific community and with society in general as regards their fields of knowledge in the manner and languages that are typical of the international scientific community to which they belong.
f) An ability to foster scientific, technological, social, artistic and cultural progress in academic and professional contexts within a knowledge-based society.

The award of a doctoral degree must equip the graduate for work in a variety of settings, especially those requiring creativity and innovation. Doctoral graduates must have at least acquired the personal skills needed to:

a) Develop in contexts in which there is little specific information.
b) Find the key questions that must be answered to solve a complex problem.
c) Design, create, develop and undertake original, innovative projects in their field.
d) Work as part of a team and independently in an international or multidisciplinary context.
e) Integrate knowledge, deal with complexity and make judgements with limited information.
f) Offer criticism on and intellectually defend solutions.

Finally, with respect to competencies, doctoral students must:
a) have acquired advanced knowledge at the frontier of their discipline and demonstrated, in the context of internationally recognised scientific research, a deep, detailed and well-grounded understanding of theoretical and practical issues and scientific methodology in one or more research fields;
b) have made an original and significant contribution to scientific research in their field of expertise that has been recognised as such by the international scientific community;
c) have demonstrated that they are capable of designing a research project that serves as a framework for carrying out a critical analysis and assessment of imprecise situations, in which they are able to apply their contributions, expertise and working method to synthesise new and complex ideas that yield a deeper knowledge of the research context in which they work;
d) have developed sufficient autonomy to set up, manage and lead innovative research teams and projects and scientific collaborations (both national and international) within their subject area, in multidisciplinary contexts and, where appropriate, with a substantial element of knowledge transfer;
e) have demonstrated that they are able to carry out their research activity in a socially responsible manner and with scientific integrity;
f) have demonstrated, within their specific scientific context, that they are able to make cultural, social or technological advances and promote innovation in all areas within a knowledge-based society;
g) have demonstrated that they are able to participate in scientific discussions at the international level in their field of expertise and disseminate the results of their research activity to audiences of all kinds.

Number of places

8

Duration of studies and dedication regime

Duration
The maximum period of study for full-time doctoral studies is three years, counted from the date of admission to the programme to the date of submission of the doctoral thesis. The academic committee of the doctoral programme may authorise a doctoral candidate to pursue doctoral studies on a part-time basis. In this case, the maximum period of study is five years, counting from the date of admission to the programme to the date of submission of the doctoral thesis. For calculating these periods, the date of admission is considered to be the date of the first enrolment for tutorials, and the date of submission the moment in which the Doctoral School officially deposits the doctoral thesis.

For full-time doctoral candidates, the minimum period of study is two years, counted from the date of an applicant's admission to the programme until the date on which the doctoral thesis is deposited; for part-time doctoral candidates it is four years. When there are justified grounds for doing so, and the thesis supervisor and academic tutor have given their authorisation, doctoral candidates may request that the academic committee of their doctoral programme exempt them from the minimum period of study requirement.

The calculation of periods of study will not include periods of absence due to illness, pregnancy or any other reason provided for in the regulations in force. Students who find themselves in any of these circumstances must notify the academic committee of the doctoral programme, which, where appropriate, must inform the Doctoral School. Doctoral candidates may also temporarily withdraw from the programme for up to one year, and this period may be extended for an additional year. Doctoral candidates who wish to interrupt their studies must submit a justified request to the academic committee of the doctoral programme, which will decide whether or not to approve the request. Each programme will establish conditions for readmission to doctoral studies.

Extension
If full-time doctoral candidates have not applied to deposit their thesis by the end of the three-year period of study, the academic committee of the programme may authorise an extension of up to one year. In exceptional circumstances, a further one-year extension may be granted, subject to the conditions established by the corresponding doctoral programme. In the case of part-time doctoral candidates, an extension of two years may be authorised. In both cases, in exceptional circumstances a further one-year extension may be granted by the Doctoral School's Standing Committee, upon the submission of a reasoned application by the academic committee of the doctoral programme.

Dismissal from the doctoral programme
A doctoral candidate may be dismissed from a doctoral programme for the following reasons:

• The doctoral candidate submitting a justified application to withdraw from the programme.
• The maximum period of study and of extensions thereof ending.
• The doctoral candidate not having enrolled every academic year (unless he or she has been authorised to temporarily withdraw).
• The doctoral candidate failing two consecutive assessments.
• The doctoral candidate having disciplinary proceedings filed against him or her that rule that he or she must be dismissed from the UPC.

Dismissal from the programme implies that doctoral candidates cannot continue studying at the UPC and the closing of their academic record. This notwithstanding, they may apply to the academic committee of the programme for readmission and the committee must reevaluate them in accordance with the criteria established in the regulations.

Enrollment aid

Do not exist.

Organization

• Hesselbach Serra, Xavier

• Aguilar Igartua, Mónica
• Calveras Auge, Anna
• de Andrade Jardim, Marilet
• Martin Escalona, Israel
• Serrat Fernandez, Juan
• Soriano Ibañez, Miquel

• Department of Network Engineering (PROMOTORA)

Agreements with other institutions

There are various joint supervision agreements with European and international universities, for example, with Uruguay, Mexico and Lebanon, among other countries, and projects such as 5GAuRA, which is part of the H2020 Marie Curie Programme.

In addition, verbal agreements have been made with European universities for short-term visits of our doctoral students. As a result, doctoral students have been able to carry out research visits of at least three months in the universities or technology schools of Amsterdam, Grenoble, Glasgow, Milan, Louvain and China (Changsha), among other places.

Joint supervision is also carried out with the Telecommunications Technology Centre of Catalonia (CTTC) in the area of wireless technology, fixed networks and security.

Access profile

The doctoral programme is designed for students who have taken master’s degrees in telecommunications or computer science and wish to examine a topic or area in greater depth to contribute knowledge. Although we could say that this is the ideal starting point, it is not the only one. Students with other educational backgrounds could also be accepted, although they may need to take bridging courses.

The doctoral programme is designed for people with technological interests who are creative and want to advance the state-of-the-art in the subject. This activity requires an attitude to technology that goes beyond user knowledge to reach an understanding of technology itself, which the doctoral student will know how to improve as a result. Doctoral studies have two benefits. First, they meet personal needs to understand things, and second they train the person, providing them with methodology and knowledge that they can use in their professional activity in positions that require technological creativity.

Research and development departments in companies or the creation of emerging companies are places where this knowledge could be exploited to the maximum.

The natural route into the doctoral programme is via the various master’s degrees in Telecommunications Engineering at the UPC taught by the ETSETB and the EETAC, in which case bridging courses are not required. For students from other master’s programmes, the academic committee of the doctoral programme will analyse applicants’ academic record and the area in which they will develop their thesis. Based on this information, the committee will decide whether students need to take bridging courses up to a maximum of 30 credits. As a general rule, students who hold a master’s degree in telecommunications (or an equivalent qualification) from other Spanish or European universities can access the research phase directly. Students with a master’s degree in computer science may be asked to take a bridging course in the subject area of telecommunication networks. Students who come from other master’s degrees should take additional credits so that they can gain the knowledge they need rapidly. The range of topics and approaches used to carry out the research makes it difficult to establish specific admission requirements (some theses have a high mathematics content, others are more focused on application). However, in general, knowledge of tools that can be used for performance evaluation will be assessed. Hence, applicants must be able to handle mathematical models, numerical methods, simulation tools such as ns-3, OMNET, Matlab or have knowledge of programming in Java, C++, C or Python for the construction of prototypes. Knowledge of written and spoken English is essential, as this is the language that will be used in the doctoral degree, for training, generation of publications and reports, and the exchange of knowledge with other researchers.

Access requirements

Applicants must hold a Spanish bachelor’s degree or equivalent and a Spanish master’s degree or equivalent, provided they have completed a minimum of 300 ECTS credits on the two degrees (Royal Decree 43/2015, of 2 February)

In addition, the following may apply:

• Holders of an official degree awarded by a university in Spain or any other country in the European Higher Education Area, pursuant to the provisions of Article 16 of Royal Decree 1393/2007, of 29 October, which establishes official university course regulations, who have completed a minimum of 300 ECTS credits on official university degrees, of which at least 60 must be at the master's degree level.
• Holders of an official Spanish bachelor’s degree comprising at least 300 credits, as provided for by EU regulations. Holder of degrees of this kind must complete bridging courses unless the curriculum of the bachelor’s degree in question included research training credits equivalent in value to those which would be earned on a master's degree.
• Holders of an official university qualification who, having passed the entrance examination for specialised medical training, have completed at least two years of a training course leading to an official degree in a health-sciences specialisation.
• Holders of a degree issued under a foreign education system. In these cases, homologation is not required, but the UPC must verify that the degree certifies a level of training equivalent to an official Spanish master's degree and qualifies the holder for admission to doctoral studies in the country where it was issued. Admission on this basis does not imply homologation of the foreign degree or its recognition for any purpose other than admission to doctoral studies.
• Holders of a Spanish doctoral qualification issued under previous university regulations.

Note 1: Doctoral studies entrance regulations for holders of an undergraduate degree awarded before the introduction of the EHEA (CG 47/02 2014)

Note 2: Governing Council Decision 64/2014, which approves the procedure and criteria for assessing the fulfilment of academic admission requirements for doctoral studies by holders of non-homologated foreign degrees (CG 25/03 2014)

Admission criteria and merits assessment

Ultimately, admission to the doctoral programme will be regulated by the academic committee of the doctoral programme. As described in Section 8 of this document, this body is directed by the coordinator of the doctoral programme, assisted by a committee comprised of lecturers who participate in the programme who are put forward by the research groups. If the ex officio members of the committee consider it necessary, they may propose other lecturers who represent relevant research areas. The composition of the academic committee of the doctoral programme should be approved by the board of the Department.

The function of the academic committee is to ensure the quality of the doctoral programme by participating in the processes of admission, monitoring, evaluation and assessment. If there is no proposal of a thesis supervisor, the academic committee is responsible for assigning one. Based on the applicants’ thesis topic preferences, the member of the academic committee who is most closely associated with this area will propose a supervisor. If the person responsible for this area cannot meet the requirement, another area will be sought and the request will be repeated. If a supervisor cannot be found after consulting all members of the academic committee, the application cannot be accepted.

If a thesis supervisor is available, applicants are then assessed on the following aspects, with a score of 0 to 10 given for each one and the following weightings:

• Academic record and academic background (30%).
• Research experience (10%).
• Language knowledge (10%).
• Other relevant aspects described in the CV that are not considered in the three previous points (5%).
• Evaluation by the doctoral thesis supervisor (30%).
• Evaluation by the academic committee of the doctoral programme (15%).

Students will be accepted if they have a score of 7 points or over. In all cases, applicants will be notified of the decision, and will be given a report on the overall and partial evaluations. So that the decision is not personalised, the supervisor’s and academic committee director’s evaluations will be averaged, and this will be the score that is announced.

Along with admission, the academic committee will provide enrolment recommendations if bridging courses are required. The recommended credits (up to a maximum of 30) for bridging courses correspond to subjects in the area of telematics that can be taken in the shortest time possible.

Training complements

The academic committee for the programme may require that doctoral students pass specific bridging courses. In this case, it will monitor the bridging courses that are taken and establish suitable criteria to limit their duration.

The bridging courses will be on research training, but doctoral students will never be asked to enrol for a number equal to or above 60 ECTS. The academic regulations of doctoral studies state that bridging courses may also be cross-disciplinary. However, this point is likely to be amended so that bridging courses are only associated with research credits, particularly when an applicant enters the doctoral programme with a bachelor’s degree worth 300 ECTS.

Considering the doctoral student activity report (DAD), the academic committee of the programme could propose additional measures to those established in the regulations that lead to the withdrawal of doctoral students who do not meet the established criteria.

The natural route into the doctoral programme is via a master’s degree in Telecommunications Engineering at the UPC, in which case it is not necessary to complete bridging courses. For students from other master’s degree programmes, the academic committee of the doctoral programme will analyse the applicant’s academic record and decide the area in which they will prepare their thesis, as well as whether it is necessary to complete bridging courses, up to a maximum of 30 credits.

Currently, bridging courses are offered in the framework of master’s degrees in Telecommunications Engineering at the UPC taught by the ETSETB and the EETAC (https://eetac.upc.edu/en/study/masters-degrees/masteam, https://matt.masters.upc.edu/).

Below are some of the subjects that are currently offered on these master’s degrees:

Enrolment period for new doctoral students

Students enrolling in the doctoral programme for the first time must do so by the deadline specified in the admission decision.

Unless otherwise expressly indicated, enrolments corresponding to admission decisions issued from the second half of April on must be completed within the ordinary enrolment period for the current academic year.

More information at the registration section for new doctoral students

Enrolment period

Ordinary period for second and successive enrolments: first half of October.

More information at the general registration section

Procedure for the preparation and defense of the research plan

Doctoral candidates must submit a research plan, which will be included in their doctoral student activity report, before the end of the first year. The plan may be improved over the course of the doctoral degree. It must be endorsed by the tutor and the supervisor, and it must include the method that is to be followed and the aims of the research.

At least one of these annual assessments will include a public presentation and defence of the research plan and work done before a committee composed of three doctoral degree holders, which will be conducted in the manner determined by each academic committee. The examination committee awards a Pass or Fail mark. A Pass mark is a prerequisite for continuing on the doctoral programme. Doctoral candidates awarded a Fail mark must submit a new research plan for assessment by the academic committee of the doctoral programme within six months.

The committee assesses the research plan every year, in addition to all of the other activities in the doctoral student activity report. Doctoral candidates who are awarded two consecutive Fail marks for the research plan will be obliged to definitely withdraw from the programme.

If they change the subject of their thesis, they must submit a new research plan.

Formation activities

Activity: Tutorial.
Hours: 288.
Type: compulsory.

Activity: Mobility.
Hours: 480.
Type: optional.

Activity: Assessment based on doctoral student activity report (DAD) and research plan.
Hours: 4.
Type: compulsory.

Activity: Training in information skills.
Hours: 1.5.
Type: optional.

Activity: Research methodology.
Hours: 12.
Type: optional.

Activity: Innovation and creativity.
Hours: 8.
Type: optional.

Activity: Language and communication skills.
Hours: 18.
Type: optional.

Activity: Courses and seminars.
Hours: 18.
Type: compulsory.
At least six seminars will be held per year. Students should attend at least three.

Activity: Specific programme workshops.
Hours: 6.
Type: compulsory.
This doctoral programme participates in an annual workshop, which is already in its third edition. The Barcelona Forum on PhD workshop. Research in Information and Communication Technologies takes one day.

Activity: Publications.
Hours: 50.
Type: compulsory.
Description: training objective and content.
The doctoral programme determines that each student must have at least one relevant JCR publication (as well as other types of publications) to complete their doctoral thesis. Publications can be completed in any phase of the three years of the doctoral degree.

Activity: Other workshops.
Hours: 72.
Type: optional.

Procedure for assignment of tutor and thesis director

The academic committee of the doctoral programme assigns a thesis supervisor to each doctoral candidate when they are admitted or enrol for the first time, taking account of the thesis supervision commitment referred to in the admission decision.

The thesis supervisor will ensure that training activities carried out by the doctoral candidate are coherent and suitable, and that the topic of the candidate’s doctoral thesis will have an impact and make a novel contribution to knowledge in the relevant field. The thesis supervisor will also guide the doctoral candidate in planning the thesis and, if necessary, tailoring it to any other projects or activities undertaken. The thesis supervisor will generally be a UPC professor or researcher who holds a doctoral degree and has documented research experience. This includes PhD-holding staff at associated schools (as determined by the Governing Council) and UPC-affiliated research institutes (in accordance with corresponding collaboration and affiliation agreements). When thesis supervisors are UPC staff members, they also act as the doctoral candidate’s tutor.

PhD holders who do not meet these criteria (as a result of their contractual relationship or the nature of the institution to which they are attached) must be approved by the UPC Doctoral School's Standing Committee in order to participate in a doctoral programme as researchers with documented research experience.

The academic committee of the doctoral programme may approve the appointment of a PhD-holding expert who is not a UPC staff member as a candidate’s thesis supervisor. In such cases, the prior authorisation of the UPC Doctoral School's Standing Committee is required. A UPC staff member who holds a doctoral degree and has documented research experience must also be proposed to act as a co-supervisor, or as the doctoral candidate’s tutor if one has not been assigned.

A thesis supervisor may step down from this role if there are justified reasons (recognised as valid by the committee) for doing so. If this occurs, the academic committee of the doctoral programme will assign the doctoral candidate a new thesis supervisor.

Provided there are justified reasons for doing so, and after hearing any relevant input from the doctoral candidate, the academic committee of the doctoral programme may assign a new thesis supervisor at any time during the period of doctoral study.

If there are academic reasons for doing so (an interdisciplinary topic, joint or international programmes, etc.) and the academic committee of the programme gives its approval, an additional thesis supervisor may be assigned. Supervisors and co-supervisors have the same responsibilities and academic recognition.

The maximum number of supervisors of a doctoral thesis is two: a supervisor and a co-supervisor.

For theses carried out under a cotutelle agreement or as part of an Industrial Doctorate, if necessary and if the agreement foresees it this maximum number of supervisors may not apply. This notwithstanding, the maximum number of supervisors belonging to the UPC is two.

More information at the PhD theses section

Permanence

The academic committee of the programme may authorise an extension of up to one year for full-time doctoral candidates who have not applied to deposit their thesis by the end of the three-year period of study, in the terms outlined in the Academic Regulations for Doctoral Studies of the Universitat Politècnica de Catalunya. In the case of part-time candidates, an extension of two years may be authorised. In both cases, in exceptional circumstances a further one-year extension may be granted by the Doctoral School's Standing Committee, upon the submission of a reasoned application by the academic committee of the doctoral programme.

A doctoral candidate may be dismissed from a doctoral programme for the following reasons:

• The doctoral candidate submitting a justified application to withdraw from the programme.
• The maximum period of study and of extensions thereof ending.
• The doctoral candidate not having enrolled every academic year (unless he or she has been authorised to temporarily withdraw).
• The doctoral candidate failing two consecutive assessments.
• The doctoral candidate having disciplinary proceedings filed against him or her that rule that he or she must be dismissed from the UPC.

Dismissal from the programme implies that doctoral candidates cannot continue studying at the UPC and the closing of their academic record. This notwithstanding, they may apply to the academic committee of the programme for readmission and the committee must reevaluate them in accordance with the criteria established in the regulations.

International Mention

The doctoral degree certificate may include International Doctorate mention. In this case, the doctoral candidate must meet the following requirements:

a) During the period of study leading to the award of the doctoral degree, the doctoral candidate must have spent at least three months at a respected higher education institution or research centre outside Spain to complete courses or do research work. The stays and activities carried out must be endorsed by the thesis supervisor and authorised by the academic committee of the programme. The candidate must provide a certifying document issued by the person responsible for the research group of the body or bodies where the stay or activity was completed. This information will be added to the doctoral student’s activity report.
b) Part of the thesis (at least the summary and conclusions) must be written and presented in one of the languages commonly used for science communication in the relevant field of knowledge, which must not be an official language of Spain. This rule does not apply to stays and reports in Spanish or to experts from Spanish-speaking countries.
c) At least two PhD-holding experts belonging to a higher education institution or research centre outside Spain must have issued officially certified reports on the thesis.
d) The thesis examination committee must have included at least one PhD-holding expert from a higher education or research institution outside Spain who was not responsible for the candidate’s stay abroad (point a) above).
e) The thesis defence must have taken place on UPC premises or, in the case of joint programmes, at the location specified in the collaboration agreement.

List of authorized thesis for defense

Last update: 16/10/2021 04:47:07.

List of lodged theses

Last update: 16/10/2021 04:30:36.

List of defended theses by year

• HAMOUDA, AHMED MOHAMED ABDELATY ELMEKKAWI: Resource Allocation and Management under Priorities Based on the Squatting-Kicking Model for Multi-Slice 5G Networks
  
  Author: HAMOUDA, AHMED MOHAMED ABDELATY ELMEKKAWI
  Thesis file: (contact the Doctoral School to confirm you have a valid doctoral degree and to get the link to the thesis)
  Programme: DOCTORAL DEGREE IN NETWORK ENGINEERING
  Department: Department of Network Engineering (ENTEL)
  Mode: Normal
  Reading date: 30/09/2021
  Thesis director: HESSELBACH SERRA, XAVIER | PINEY DA SILVA, JOSE RAMON
  

  Committee:
       PRESIDENT: AGÜERO CALVO, RAMÓN
       SECRETARI: REMONDO BUENO, DAVID
       VOCAL: BASMADJIAN, ROBERT
  Thesis abstract: The upcoming Beyond Fifth Generation networks aim to meet network services characterized by low latency and high reliability among others in different slices to provide a high-quality user experience. However, existing best-effort networking schemes that implement traditional methods of controlling and allocating network and computing resources do not meet such strict service requirements well. In International Telecommunication Union-Telecommunication sector, future services are defined as Network 2030 Services under a chartered Focus Group on Networks 2030 (FG-NET2030). The results from the FG-NET2030 analysis suggests that current networks cannot accommodate real-time applications with low latency and high bandwidth requirements. Moreover, current networks lack the capabilities to dynamically aggregate and share network resources through multiple flows, which is essential for future services.However, to satisfy the strict requirements of those services, intelligent algorithms and techniques that incorporate 5G enablers are needed to introduce novel network management systems. These intelligent algorithms shall not only result in efficient utilization of network resources but also guarantee the required quality of service for the priority slices. Moreover, cognizant of the strict latency requirements of the different services, such algorithms should include delay constraints of requests. Despite the advantages expected from future services are real-time applications, should benefit from reduced physical and logical paths between end-users and data or service hosts. However, all the above requirements are not intended for the network slicing paradigm alone. Therefore, in addition to network slicing, we want to leverage technologies and components that have features such as network programming, dynamic network reconfiguration and orchestration to enable improved performance and efficient resource management. Such technologies include NFV and SDN among others.Consequently, the main objective of this PhD thesis is to develop a service deployment algorithm that uses Squatting and Kicking techniques intelligence to effectively allocate, manage, and control slice resources under several constraints in a real-time multi-slice scenario, such as priority, bandwidth, and E2E delay with targeting to maximize the total resource usage in the substrate network.The proposed online algorithm allocates the available resource to different priority demands from source node to destination node along the routed path according to more realistic constraints, such as links' bandwidth and E2E delay. Moreover, the benefits of the new proposed algorithm will be reflected in creating real-time demands for 5G applications that are sensitive to delay, in addition to solving the resource allocation problem for large scale networks, using fewer resources and generating lower costs. Further, the proposed algorithm is adaptable to meet various QoS requirements of services, guaranteeing high QoS levels and providing high admission for higher priority classes under congested scenarios.In terms of managing bandwidth resources in a multi-slice scenario, Bandwidth Allocation Models offer improved metrics over best effort models. The proposed algorithm outperforms the others by far especially, during congested scenarios. To this end, this thesis proposes a resource allocation model called Squatting and Kicking model (SKM) to maximize the number of successfully embedded demands while maximizing the utilization in the multi-slice networks by choosing less congested paths through the efficient allocation of demands on the network. Moreover, this thesis analyzes the impact of delay constraint on the performance of an online resource allocation algorithm based on an intelligent efficient SKM, proved in this work to be the most effective up to the present time yet.
  

• IRAZABAL BENGOA, MIKEL: Enhanced Quality of Service mechanisms for 5G networks
  
  Author: IRAZABAL BENGOA, MIKEL
  Thesis file: (contact the Doctoral School to confirm you have a valid doctoral degree and to get the link to the thesis)
  Programme: DOCTORAL DEGREE IN NETWORK ENGINEERING
  Department: Department of Network Engineering (ENTEL)
  Mode: Normal
  Reading date: 10/09/2021
  Thesis director: LOPEZ AGUILERA, MARIA ELENA | DEMIRKOL, ILKER SEYFETTIN
  

  Committee:
       PRESIDENT: KATSALIS, KONSTANTINOS
       SECRETARI: GARCIA VILLEGAS, EDUARD
       VOCAL: BRUNSTÖM, ANNA KARIN
  Thesis abstract: The heterogeneous services with stringent requirements that are envisioned to co-exist under the fifth generation of cellular networks (5G), inexorably challenge the current Long-Term Evolution (LTE) cellular network¿s features. Consequently, an important amount of effort has been invested to reduce current latency while increasing the throughput and the reliability. As an example, 5G¿s uplink granted free transmission procedure permits reserving Resource Blocks(RBs) in advance for a set of User Equipments (UEs), and thus, reduce the latency by eliminating the UEs resource request procedure. Likewise, the cellular network stack has experience major changes in different layers. Examples of it is the new Radio Link Controller (RLC) Packet Data Unit (PDU) that enables a faster packet forming at the expense of reducing the compression ratio. These solutions address latency causes that lie in 5G¿s protocol stack, and will unquestionably enhance 5G¿s capability to meet the rigorous services¿ latency requirements. In addition, 5G has introduced a new sublayer (i.e., Service Data Adaptation Protocol (SDAP)), and has defined a new Quality of Service (QoS) Flow Indicator(QFI) as its finest quality granularity indicator. However, delays generated by the pace at which data packets are forwarded or its sizes, can significantly impact the latency in contemporary cellular networks, and ruin the stringent timing guarantees required by delay-sensitive services if they are not carefully considered. One of the problems associated with the pace at which the data packets are forwarded is the bufferbloat, and will specifically occur in 5G¿s Radio Access Network RAN since contemporary wired links are orders of magnitude faster than wireless links, and are provided with large buffers to always fulfill the fluctuating radio link capacity.Being the RAN the bottleneck and having large buffers together with the fact that most of contemporary data is transported through the loss-based congestion control algorithm, Transmission Control Protocol (TCP) Cubic, suffice to bloat the buffers and increase the latency. In this thesis we provide quantitative results of the bufferbloat problem in contemporary cellular networks. We first thoroughly explain 5G¿s QoS hierarchical multi-queuing and show how the bufferbloat increases the latency. Following, we propose the (enhanced)5G Bandwidth Delay Product ((e)5G-BDP), the Dynamic RLC Queue Limit (DRQL) and the UPF-SDAP Pacer (USP) solutions, enhancing the current 5G QoS multi-queuing architecture, and approaching through two different paradigms. We evaluate our proposed solutions in an emulator, as well as in a testbed, against state-of-the-art solutions and conclude that a new QoS hierarchical multi-queuing architecture is needed in 5G to fulfill the latency requirements for which it is envisioned. Moreover, since information in the wired link is transported in packets, while in the RAN is transmitted through RBs, packets that do not fit in the assigned RBs, are segmented and transmitted during different Transmission Time Intervals (TTIs). Such mechanism prevents wasting the scarce wireless transmission opportunities. However, the segmented information at the receiver cannot be forwarded until all the remaining information from the packet is reassembled, which in the best case occurs during the next transmission opportunity. We exhaustively study the problem and propose a RB scheduling algorithm named Elastic Quantum Partition (EQP) to address this challenge and compare it quantitatively against a Fixed Partition (FP) RB distribution in different scenarios in a testbed with dynamic Modulation and Coding Scheme (MCS), off-the-shelf equipment and slices. The outcome shows a latency reduction when scheduling the RBs elastically rather than using a fixed scheduler. In summary, in this thesis we shed some light in the bufferbloat phenomenon and the segmentation/reassembly procedure in current cellular netw
  

Last update: 16/10/2021 05:11:51.

Research groups

• BAMPLA-Design and Evaluation of Broadband Networks and Services
• GRXCA-Research Group on Cellular and Ad-hoc Networks
• ISG-Information Security Group
• MAPS-Management, Pricing and Services in Next Generation Networks
• SISCOM-Smart Services for Information Systems and Communication Networks
• WNG-Wireless Networks Group

Teachers

• Aguilar Igartua, Mónica
• Agusti Torra, Anna
• Alins Delgado, Juanjo
• Barcelo Arroyo, Francisco
• Calveras Auge, Anna
• Casademont Serra, Jordi
• Casals Ibañez, Lluis
• Cervello Pastor, Cristina
• Cruz Llopis, Luis Javier de la
• Domingo Aladren, Maria del Carmen
• Esparza Martin, Oscar
• Fernandez Muñoz, Marcel
• Forne Muñoz, Jordi
• Garcia Villegas, Eduard
• Gomez Montenegro, Carles
• Gorricho Moreno, Juan Luis
• Guasch Murillo, Daniel
• Hernandez Serrano, Juan Bautista
• Hesselbach Serra, Xavier
• Lopez Aguilera, Maria Elena
• Martin Escalona, Israel
• Mata Diaz, Jorge
• Melus Moreno, Jose Luis
• Muñoz Tapia, Jose Luis
• Pallares Segarra, Esteve
• Paradells Aspas, Jose
• Parra Arnau, Javier
• Pegueroles Valles, Josep
• Postigo Boix, Marcos
• Remondo Bueno, David
• Rico Novella, Francisco Jose
• Rincon Rivera, David
• Sallent Ribes, Sebastian
• Serrat Fernandez, Juan
• Soriano Ibañez, Miquel
• Vidal Ferre, Rafael
• Zola, Enrica Valeria