Adaptative power control algorithm for 3G cellular CDMA networks

Jad Nasreddine (1) , Loutfi Nuaymi (1) , Xavier Lagrange (1)

1 RSM - Département Réseaux, Sécurité et Multimédia

In this paper, we study adaptive power control algorithms for the Universal Mobile Telecommunications System (UMTS) and we propose an evolution for these algorithms. The proposed algorithm can be used in both link directions of the Frequency Division Duplex (FDD) mode and in the downlink of the Time division Duplex (TDD) mode of UMTS, where the same closed-loop power control is used. Unlike the standardized closed-loop power control algorithm of UMTS, adaptive power control algorithms have a dynamic transmitted power update step. For these algorithms, power control steps depend on the instantaneous mobile command and the command history. Our proposed algorithm adds Some intelligence to mobiles and base stations in order to limit oscillations around the target signal-to-interference ratio (SIR). When the received SIR is close to the target SIR, the receiver sends alternative up and down commands. These alternatives commands are interpreted by the transmitter. In this case, the transmitter stabilizes its transmitted power. Simulations are performed in order to evaluate the proposed algorithm performance. Simulations have shown that the proposed algorithm decreases the outage probability and dramatically reduces the transmitted power, which are the main objectives of power control algorithms.

Mots clés: CDMA networks

Domaines: Multimédia [cs.MM]; Réseaux et télécommunications [cs.NI]

Jad Nasreddine, Loutfi Nuaymi, Xavier Lagrange. Adaptative power control algorithm for 3G cellular CDMA networks. IEEE VTC Spring 2004 : Vehicular Technology Conference, 17-19 may, Milan, Italy, May 2004, Milan, Italie. pp.984 - 988, ⟨10.1109/VETECS.2004.1388978⟩. ⟨hal-02127054⟩