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it Carrier Indicator Field, referred as CIF, indicates which CC the PDSCH 8 allocation in the PDCCH isfor.Note that assignment of DL/UL data resources is never done using the cross-carrier scheduling method.Figure 8 is taken from 3GPP and illustrates the two scheduling methods that can be in used when CA isapplied. [4]Figure 8. Scheduling Alternatives for CA (FDD Configuration).5.4 MOBILITY SCENARIOS WITH CAIn LTE networks today, mobility is based on event-triggered measurements that enable handovers to aneighbor cell. The device reports measurement information in accordance with the measurementconfiguration as provided by E-UTRAN. As shown in Table 6, 3GPP Release 8 defines the followingmeasurement events that can be configured to trigger mobility.Table 6. Event Triggers for Handovers.Event A1Event A2Event A3Event A4Event A5Event B1Event B2Serving becomes better than absolute thresholdServing becomes worse than absolute thresholdNeighbor becomes offset better than servingNeighbor becomes better than thresholdServing becomes worse than threshold1 and neighbor becomesbetter than threshold2Inter RAT neighbor becomes better than thresholdServing becomes worse than threshold1 and inter RAT neighborbecomes better than threshold28 The PDSCH is the channel that carries all user data and all signaling messages.4G Americas LTE Carrier Aggregation October 2014 24