H - Electricity – 04 – W
Patent
H - Electricity
04
W
H04W 12/00 (2009.01) H04W 12/06 (2009.01) H04W 36/00 (2009.01) H04W 52/00 (2009.01) H04W 72/00 (2009.01) H04W 76/02 (2009.01) H04W 76/06 (2009.01) H04W 80/08 (2009.01) H04B 7/216 (2006.01) H04L 9/28 (2006.01) H04L 12/28 (2006.01) H04Q 3/47 (2006.01)
Patent
CA 2411996
When a network pages the temporary user mobile identifier of a mobile station, the mobile station sends a response to the network. Next, the network checks the authenticity of the user using a ciphering key, corresponding to the temporary user mobile identifier and a random number. If the temporary user mobile identifier is authenticated, a normal incoming call acceptance procedure is executed. If the mobile station is authenticated although the temporary user mobile identifier is wrong, the network reassigns a new temporary user mobile identifier to the mobile station and stops the current communication. In communication, the network and the mobile station mutually notify encipherment-onset time and negotiate about encipherment manner with each other. In addition, diversity handover is commenced upon a call attempt. Furthermore, if a branch replacement is necessary, the current branch is replaced by new branches capable of executing the diversity handover. Additionally, when a new call occurs to or from the mobile station capable of treating a plurality of calls simultaneously, the mobile station uses the same branch structure and the same communication frequency band for all of calls. Additionally, when a new call occurs to or from the mobile station capable of treating a plurality of calls simultaneously, a branch structure and a communication frequency band, which can continue all of the calls, are selected and used. Therefore, the mobile communications system is suitable for transmission of various sorts of data in accordance with the development of multimedia.
Hagiwara Junichiro
Hamajima Takuya
Hata Masafumi
Igarashi Daisuke
Ishikawa Nobutaka
Kirby Eades Gale Baker
Ntt Mobile Communications Network Inc.
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