User terminal, communication control method and chipset
摘要
說(shuō)明書(shū)
Here, “ChannelUtilizationWLAN” is included in a WLAN beacon or a probe response, and indicates a WLAN channel usage rate, i.e., a WLAN radio load level. “BackhaulRateDlWLAN” and “BackhaulRateUlWLAN” are provided from an ANQP (Access Network Query Protocol), and indicate an available transmission rate of WLAN backhaul, i.e., a WLAN backhaul load level. “BeaconRSSI” indicates received signal intensity of a beacon signal measured at the UE 100. “ThreshChUtilWLAN, Low”, “ThreshBackhRateDLWLAN, High”, “ThreshBackhRateULWLAN, High”, and “ThreshBeaconRSSIWLAN, High” are included in the assistance information, and are threshold values for switching to the WLAN 30.
Next, an example of a switching from the WLAN communication to the cellular communication, that is, a switching from the WLAN 30 to the E-UTRAN 10 will be described. The UE 100 performs, on the basis of a third determination condition regarding the cellular and a fourth determination condition regarding the WLAN, a switching determination regarding whether or not to switch from the WLAN communication to the cellular communication. Specifically, when one of the third determination condition and the fourth determination condition is satisfied, the UE 100 performs the switching from the WLAN communication to the cellular communication.
The third determination condition is the following conditions for an E-UTRAN target cell:
RSRPmeas>ThreshServingOffloadWLAN, HighP; and
RSRQmeas>ThreshServingOffloadWLAN, HighQ
Here, “ThreshServingOffloadWLAN, HighP” and “ThreshServingOffloadWLAN, HighQ” are included in the assistance information, and are threshold values for switching to the E-UTRAN 10.
