Section: 4.11.3 Handling multiple tracking area codes from the lower layers
Content: When a UE camps on a satellite E-UTRAN cell, the UE may receive multiple TACs from the lower layers. The UE shall construct TAIs from the multiple TACs (i.e. concatenate the identity of the current PLMN and each of the TACs) and select a TAI as follows: a) if at least one TAI belongs to the TAI list of the UE, the UE shall select a TAI which belongs to the TAI list. If there are multiple TAIs which belong to the TAI list the UE shall consider each of these TAIs equal and: - if the UE can determine a TAI which represents the best the tracking area of the UE's geographical location, the UE shall select a TAI which represents the best the tracking area of the UE's geographical location; and - otherwise, the UE shall select a TAI in an implementation-specific way. b) if no TAI belongs to the TAI list of the UE and: 1) there is a TAI which belongs to neither the list of "forbidden tracking areas for roaming" nor the list of "forbidden tracking areas for regional provision of service", the UE shall select a TAI which belongs to neither the list of "forbidden tracking areas for roaming" nor the list of "forbidden tracking areas for regional provision of service". In this case, if there are multiple TAIs which belong to neither the list of "forbidden tracking areas for roaming" nor the list of "forbidden tracking areas for regional provision of service", then the UE shall consider each of these TAIs equal and: - if the UE can determine a TAI which represents the best the tracking area of the UE's geographical location, the UE shall select a TAI which represents the best the tracking area of the UE's geographical location; and - otherwise, the UE shall select a TAI in an implementation-specific way. 2) all TAIs belong to the list of "forbidden tracking areas for roaming" or the list of "forbidden tracking areas for regional provision of service", then the UE shall consider each of these TAIs equal and: - if the UE can determine a TAI which represents the best the tracking area of the UE's geographical location, the UE shall select a TAI which represents the best the tracking area of the UE's geographical location; and - otherwise, the UE shall select a TAI in an implementation-specific way. The UE shall consider the selected TAI as the current TAI. The UE shall select a TAI as described above when: a) the UE receives multiple TACs from the lower layers; or b) the UE has received multiple TACs from the lower layers upon starting to camping on the current cell and the TAI list, the list of "forbidden tracking areas for roaming", or the list of "forbidden tracking areas for regional provision of service" is updated. Handling of the list of "forbidden tracking areas for roaming" and the list of "forbidden tracking areas for regional provision of service" is specified in clause 5.3.2.