Abstract: When a strength of an electric field for receiving wireless in downlink is equal to or smaller than a predetermined strength, the mobile communication terminal device 105 transmits a retrieval request to the retrieval server 102 through the first wireless station 103 to cause the retrieval server to start selecting a new wireless station, changes at least one of profiles (UTP) for transmitting wireless in uplink, and notifies the first wireless station 103 of the changed profile(s). The first wireless station 103 changes a profile or profiles (URP) for receiving wireless in uplink, corresponding to the changed profile(s) (UTP) for transmitting wireless in uplink, received from the mobile wireless terminal device, changes at least one of profiles (DTP) for transmitting wireless in downlink, and notifies the mobile wireless terminal device of the changed profile(s) (DTP) for transmitting wireless in downlink.

Abstract: When a strength of an electric field for receiving wireless in downlink is equal to or smaller than a predetermined strength, the mobile communication terminal device 105 transmits a retrieval request to the retrieval server 102 through the first wireless station 103 to cause the retrieval server to start selecting a new wireless station, changes at least one of profiles (UTP) for transmitting wireless in uplink, and notifies the first wireless station 103 of the changed profile(s). The first wireless station 103 changes a profile or profiles (URP) for receiving wireless in uplink, corresponding to the changed profile(s) (UTP) for transmitting wireless in uplink, received from the mobile wireless terminal device, changes at least one of profiles (DTP) for transmitting wireless in downlink, and notifies the mobile wireless terminal device of the changed profile(s) (DTP) for transmitting wireless in downlink.

Abstract: When a strength of an electric field for receiving wireless in downlink is equal to or smaller than a predetermined strength, the mobile communication terminal device 105 transmits a retrieval request to the retrieval server 102 through the first wireless station 103 to cause the retrieval server to start selecting a new wireless station, changes at least one of profiles (UTP) for transmitting wireless in uplink, and notifies the first wireless station 103 of the changed profile(s). The first wireless station 103 changes a profile or profiles (URP) for receiving wireless in uplink, corresponding to the changed profile(s) (UTP) for transmitting wireless in uplink, received from the mobile wireless terminal device, changes at least one of profiles (DTP) for transmitting wireless in downlink, and notifies the mobile wireless terminal device of the changed profile(s) (DTP) for transmitting wireless in downlink.

Abstract: A wireless LAN system of the present invention is provided with a wireless LAN client terminal (40) and a wireless LAN access point (10) which performs wireless communication with the wireless LAN client terminal (40) to connect the wireless LAN client terminal (40) to an external network, and the wireless LAN access point (10) is attached to a lighting apparatus.

Abstract: A voice interruption, which occurs during handover between mobile communication networks that are different from each other, is notified to a speaker. A mobile communication terminal, which has a function to handover between mobile communication networks that are different from each other, has a notification unit that performs a notification operation to notify the speaker of a handover between mobile communication networks. The notification unit is kept operating for a predetermined time to cover at least an instantaneous break period of voice data, caused by a handover between mobile communication systems, either (1) when radio units are switched because communication methods are switched or (2) when the voice data methods are switched because communication methods are switched.

Abstract: An antenna diversity transceiver selects at least one of a plurality of antennas with a good condition during a standby state before communication. Preferably, the transceiver selects the antennas having the highest reception electric field level when a predetermined user operation, such as opening an upper unit, extending an extendable external antenna, or operating input keys, is detected. The transceiver may select the antennas before the transceiver transmits or receives a signal to or from said based station during a standby state.