TDD Aggregation Figure 3.7 Using FDD band as the coverage band with FDD-TDD CA LTE-Advanced Evolution in Releases 12-13 The 3GPP is working on further FDD-TDD band combinations beyond Release 12, with more being added to the work program for 2015. Even if a new band combination is added in Release 13 or later, it is added as Release-independent band combination, thus can be implemented on top of Release 12 without having to wait for any other Release 13 features. Band 8 (900 MHz) and Band 40 (2300 MHz). This was completed as part of the original TDD-FDD carrier aggregation work item [7] in June 2014 as the example band combination. In this case also, only one uplink is supported together with two downlinks (as with all cases covered in Release 12 timeline for FDD-TDD carrier aggregation). Band 1 (2100 MHz) and Band 41 (2600 MHz) Band 1 (2100 MHz) and Band 42 (3.5 GHz) Band 1 (2100 MHz) and Band 40 (2300 MHz) Band 3 (1800 MHz) and Band 38 (2600 MHz Europe) Band 3 (1800 MHz) and Band 40 (2300 MHz) Band 5 (850 MHz) and Band 40 (2300 MHz) Band 20 (800 MHz) and Band 40 (2300 MHz) WLAN-Radio Interworking As part of 3GPP Release 12 work was done to address the problem of a UE with good LTE connection selecting a poor performing WLAN network. The solutions are designed to operate together (not necessary requiring) with the Access Network Discovery and Selection Function (ANDSF) functionality specified on the core network side. The 3GPP did first a study [8] that identified the following three options to be considered: Solution 1 considers both ANDSF and RAN guidance and policies for WLAN off-loading control. In this approach, eNodeB provides RAN assistance information to the UE (broadcast or dedicated signalling) The UE would use the RAN assistance information, UE measure- ments and information provided by WLAN and policies that are obtained via the ANDSF to guide the WLAN selection. Solution 2 was based on providing the offloading rules from eNodeB via Radio Resource Control (RRC) signalling (dedicated or broadcasted), 