Radio Resource Control
|The OSI model|
|7 Application layer|
|6 Presentation layer|
|5 Session layer|
|4 Transport layer|
|3 Network layer|
|2 Data link layer|
|1 Physical layer|
- Functions for connection establishment and release,
- Broadcast of system information,
- Radio bearer establishment/reconfiguration and release,
- RRC connection mobility procedures,
- Paging notification and release,
- Outer loop power control.
There can only be one RRC connection open to a UE at any one time.
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.
3GPP 25.331 specification - Radio Resource Control.
- 3GPP TS 25.331
- "Energy Consumption of Always-On Applications in WCDMA Networks". In Proceedings of the 65th Semi-Annual IEEE Vehicular Technology Conference (Dublin, Ireland). April 2007.
- L. de Bruynseels, “Tuning Inactivity Timer Settings in UMTS”, white paper, Commsquare Ltd., 2005
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