 dedicated RRC signaling is used for sending the component carrier's system information which is necessary for component carrier transmission/reception similar to 3GPP LTE Rel-8 for handover. Detection of a component carrier failure by the UE does not necessarily trigger re-establishment of a connection. The RRC connection re-establishment triggers by the UE include the failure of all component carriers on which the UE is configured to receive PDCCH, loss of all uplink communications, or an indication from the RLC sub-layer that the maximum number of re- transmissions has been reached. The UE sees a component carrier as any other carrier frequency and a measurement object needs to be set up for a component carrier for the UE to measure it. Inter-frequency neighbor measurements, in which no serving cell is defined for measurement purposes, include all the carrier frequencies which are not configured as component carriers. The 3GPP LTE Rel-8 idle mode mobility procedures are applied to a network with carrier aggregation. It is possible for a network to configure only a subset of component carriers for idle mode operation. Table 11-3 shows four scenarios that are being investigated for the carrier aggregation in 3GPP RAN4 [21,24]. As mentioned earlier, the impacts of carrier aggregation on the RF requirements for the base station and mobile station need to be carefully considered. The areas which are impacted include transmitter aspects (base station output power, transmitted signal quality, unwanted emissions, transmitter spurious CHAPTER 11 Multi-Carrier Operation Table 11-3 Carrier Aggregation Scenarios under Consideration in 3GPP LTE Release 10 Option Deployment Scenarios Single-band contiguous allocation for FDD (UL: 40 MHz; DL: 80 MHz) Single-band contiguous allocation for TDD (100 MHz) Multi-band non-contiguous allocation for FDD (UL: 40MHz; DL: 40 MHz) Multi-band non-contiguous allocation for TDD (90 MHz) Table 11-4 Transmit/Receive Characteristics for Carrier Aggregation Scenarios Transmit Characteristics I