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Energy conservation is critical for third generation (3G) cellular systems. In particular, future high-speed packet data services are expected to exhaust the energy of a mobile station rapidly. In 3GPP systems, the radio resource is mainly controlled by the radio resource control (RRC). This paper quantifies the energy consumption and the reconnection ratio for 3GPP systems based on the RRC state machine. Bursty and streaming packet data services are investigated. Through analytic models and comprehensive simulation with various traffic models, the impacts of diverse timer values on the RRC state machine are illustrated. In addition to quantifying energy consumption, appropriate timer values are suggested.