Fast-Lipschitz Power Control and User-Frequency Assignment in Full-Duplex Cellular Networks
2017 (English)Article in journal (Refereed) Submitted
In cellular networks, the three-node full-duplex transmission mode has the po-tential to increase spectral efficiency without requiring full-duplex capability ofusers. Consequently, three-node full-duplex in cellular networks must deal with self-interference and user-to-user interference, which can be managed by power controland user-frequency assignment techniques. This paper investigates the problem ofmaximizing the sum spectral efficiency by jointly determining the transmit powersin a distributed fashion, and assigning users to frequency channels. The problem is for-mulated as a mixed-integer nonlinear problem, which is shown to be non-deterministicpolynomial-time hard. We investigate a close-to-optimal solution approach by dividingthe joint problem into a power control problem and an assignment problem. The powercontrol problem is solved by Fast-Lipschitz optimization, while a greedy solution withguaranteed performance is developed for the assignment problem. Numerical resultsindicate that compared with the half-duplex mode, both spectral and energy efficienciesof the system are increased by the proposed algorithm. Moreover, results show that thepower control and assignment solutions have important, but opposite roles in scenarioswith low or high self-interference cancellation. When the self-interference cancellationis high, user-frequency assignment is more important than power control, while powercontrol is essential at low self-interference cancellation.
Place, publisher, year, edition, pages
IEEE Communications Society, 2017.
full-duplex, power control, assignment, cellular networks
Research subject Telecommunication
IdentifiersURN: urn:nbn:se:kth:diva-204605OAI: oai:DiVA.org:kth-204605DiVA: diva2:1085598
QC 201704192017-03-292017-03-292017-04-19Bibliographically approved