[ca] L'Uplink and downlink decoupling és una innovadora tècnica que ha sigut proposada recentment per reduir el problema de l'uplink and downlink imbalance. L'uplink and downlink imbalance es dona a les heterogeneus networks (HetNets) degut a la disparitat de potències entre les diferents antenes. Durant aquest projecte, tenint en compte la recent recerca sobre DUDe (sobretot sobre la probabilitat d'associació), s'utilitza per calcular la capacitat a qualsevol SCell. Aquesta situació és molt important d'analitzar ja que pot ser possible que algunes no estiguin accessibles per sobrecàrrega. Per aquest motiu, un dels principals objectius del projecte és avaluar la millora de capacitat entre realitzar el DUDe a qualsevol SCell i mantenir l'associació amb la MCell com s'havia fet fins ara, el que es coneix com downlink receive power (DRP). El DUDe també comporta moltes millores a la outage probability, indicador que també s'avalua a l'estudi. En els estudis més recents també treballen amb dual connectivity per millorar les prestacions. Tot i que dividir la transmissió a l'enllaç de pujada pot comportar perdre capacitat degut a la baixa potència de l'usuari, es compara la capacitat amb el DUDe en un escenari de dual connectivity amb el cas de single best association. Els resultats mostren que el fet de desacoblar l'accés augmenta la capacitat de la connexió tot i tenir algunes SCells inabastables. També s'ha demostrat que el DUDe funciona perfectament amb la dual connectivity.

[en] Uplink and downlink decoupling (DUDe) is a disruptive technique that has been proposed recently to reduce the uplink and downlink imbalance problem, which occurs in HetNets due to the strong transmit power disparities between macro and small cells. In this thesis, previous research done on DUDe, in particular the association probability derivation, is used to calculate how the capacity is affected when the association is made to any SCell in the scenario. This specific situation is highly realistic since one or several small cells might be unavailable due to overload reasons. Therefore, one of the main objectives of this thesis is to evaluate and compare the potential capacity gains of decoupling to any other small cell in the scenario with respect to the macro cell, association that follows classical downlink received power policies. Decoupling uplink from the macro cell can improve as well the uplink outage, metric also evaluated and compared in this study. Moreover, there is a strong trend in research to empower multi-connectivity solutions, where one user has more than one uplink connection. We refer to this case as a dual connectivity scenario, and the uplink is further studied by allowing decoupled associations in dual connectivity scenarios. Dual connectivity in the uplink is highly controversial, since the user has limited power to share between two different access points. Therefore, a part from comparing the decoupled association performance with the downlink received power policies, this study compares the performance of multi-connectivity against having one single serving cell. In this case, a comparison is done with respect to the best uplink serving cell. Results show that decoupling the access increases the capacity even if there are some SCells unreachable and presents great performance on DC scenario.