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The Radio Resource Control (RRC) protocol belongs to the Universal Mobile Telecommunication System, Wideband Code Division Multiple Access (W-CDMA (UMTS)) stack and handles the control plane signalling of Layer 3 between the User Equipment (UE) and the UMTS Terrestrial Radio Access Network (UTRAN). The major functions of the RRC protocol include connection establishment and release functions, broadcast of system information, radio bearer establishment,reconfiguration and release, RRC connection mobility procedures, paging notification and release and outer loop power control. By means of the signalling functions the RRC configures the user and control planes according to the network status and allows for Radio Resource Management strategies to be implemented. The operation of the RRC is guided by a state machine which defines certain specific states that a UE may be present in. The different states in this state machine have different amounts of radio resources associated with them and these are the resources that the UE may use when it is present in a given specific state. Since different amounts of resources are available at different states the quality of the service that the user experiences and the energy consumption of the UE are influenced by this state machine. == RRC inactivity timers == The configuration of RRC inactivity timers in a W-CDMA network has considerable impact on the battery life of a phone when a packet data connection is open. The RRC idle mode (no connection) has the lowest energy consumption. The states in the RRC connected mode, in order of decreasing power consumption, are CELL_DCH (Dedicated Channel), CELL_FACH (Forward access channel), CELL_PCH (Cell Paging channel) and URA_PCH (URA Paging channel). The power consumption in the CELL_FACH is roughly 50 percent of that in CELL_DCH, and the PCH states use about 1-2 percent of the power consumption of the CELL_DCH state.〔 The transitions to lower energy consuming states occur when inactivity timers trigger. The T1 timer controls transition from DCH to FACH, the T2 timer controls transition from FACH to PCH, and the T3 timer controls transition from PCH to idle.〔 Different operators have different configurations for the inactivity timers, which leads to differences in energy consumption.〔L. de Bruynseels, “Tuning Inactivity Timer Settings in UMTS”, white paper, Commsquare Ltd., 2005〕 Another factor is that not all operators use the PCH states.〔 抄文引用元・出典: フリー百科事典『 ウィキペディア（Wikipedia）』 ■ウィキペディアで「Radio Resource Control」の詳細全文を読む スポンサード リンク
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