 there is no need to plan and optimize neighbour lists. Caching rules and implementation is not specified and is UE dependent. 2 Obviously, the 3G SIB scheduling should be optimized by default even without DMCR and CSFB as it has major impact on cell access time and UE battery consumption [4]. LTE Small Cell Optimization CSFB with PS Handover CSFB with PS handover can be made with or without target RAT measurements. The measure- ment quantity is either received level (RSCP for 3G and RSSI for 2G) or signal quality (Ec/NO for 3G). The measurement-based handover is especially beneficial in interference prone areas such as high-rise buildings because the UE can be handed over to the least interfered layer. Therefore, one important use case for PS handover is the capability to use Ec/NO measurements to select the target layer. CSFB PS handover may also improve the call setup time relative to redirect. If the handover is preceded by measurements however, part of this speed-up is consumed by measurement configuration in source LTE cell, target RAT measurements and handover preparation. For 3G target RAT, these components amount roughly to the following: Time to first measurement report from Extended Service Request depends on the length of the 3G neighbour list and time to trigger. The range is from 0.1 seconds to more than 1 second. Handover preparation to target RAT is typically about 0.3 seconds. From Handover Command in LTE to Handover Complete in target 3G cell is about 0.3 seconds. The total time to access 3G is typically around 1 second; obviously this assumes optimized neighbour list and target RAT with sufficient radio quality. This is faster than blind redirect with DMCR or redirect with pre-stored SIBs, but slower than blind redirect with system information. On the other hand, the resources in target system have already been reserved during preparation phase and UE can send the initial NAS message very quickly after the handover is completed. With 13.6 kbps signalling bearer this saves another 0.3 seconds re