Interference Control Technics in Mixed Networks: Downlink Power Control for GPRS

R. Rodríguez, J. Martínez, and J. Romero (Spain)


Downlink Power Control (DLPC), General Packet Radio System (GPRS), Packet Switched (PS), Circuit Switched (CS)


Packet Switched (PS) services are being introduced gradually in already existing GSM networks. This GSM evolution is known as GPRS (General Packet Radio Service) and it allows cellular wireless data services. Since circuit and packet switched services share the same physical resources, a notably increase in the interference level is appreciated in the whole system. In order to smooth this negative effect, Downlink Power Control (DLPC) for GPRS is considered. DLPC for GPRS reduces considerably the interference introduced by the PS services and therefore increases the system capacity. In this paper a basic DLPC algorithm is presented together with results obtained from dynamic simulations in mixed scenarios (voice and data). Next results show important capacity improvements in mixed environments with PS traffic (FTP, WWW and Mail); i.e. around 50% capacity gain, maintaining the same quality in speech communications. Finally, it is demonstrated that DLPC allows the operator to control the impact of PS over CS by tuning a DLPC parameter, which is an offset of the transmitted power, increasing notably the number of satisfied voice users.

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