METHOD AND SYSTEM FOR MOBILE COMMUNICATIONS

• US 20090149182A1
• Filed: 02/03/2009
• Published: 06/11/2009
• Est. Priority Date: 04/24/1997
• Status: Active Grant

• Current Assignee: NTT Mobile Communications Network Inc. (Nippon Telegraph and Telephone Corporation)
• Original Assignee: NTT Mobile Communications Network Inc. (Nippon Telegraph and Telephone Corporation)
• Inventors: Watanabe, Yasuyuki, Sato, Takaaki, Hata, Masafumi, Tamura, Motoshi, Uchiyama, Nobuhide, Igarashi, Daisuke, Uchikoshi, Akihiro, Okamoto, Akiko, Ishikawa, Nobutaka, Hagiwara, Junichiro, Miki, Mutsumaru, Hamajima, Takuya, Yunoki, Kazufumi, Yasuda, Yoshiyuki, Kusunose, Kenya, Yamagata, Katsuhiko
• Granted Patent: US 8,331,935 B2
• Time in Patent Office: Days
• US Class Current: 455/436
• CPC Class Codes: H04B 7/022 Site diversity; Macro-diversity using two or more spaced independent antennas H04B7/04
• CPC Class Codes: H04W 12/03 Protecting confidentiality, e.g. by encryption
• CPC Class Codes: H04W 12/06 Authentication
• CPC Class Codes: H04W 36/08 Reselecting an access point
• CPC Class Codes: H04W 36/18 for allowing seamless reselection, e.g. soft reselection
• CPC Class Codes: H04W 52/04 TPC
• CPC Class Codes: H04W 52/12 Outer and inner loops
• CPC Class Codes: H04W 80/04 Network layer protocols, e.g. mobile IP [Internet Protocol]
• CPC Class Codes: H04W 84/042 Public Land Mobile systems, e.g. cellular systems
• CPC Class Codes: H04W 88/06 adapted for operation in multiple networks or having at least two operational modes, e.g. multi-mode terminals
• CPC Class Codes: H04W 88/12 Access point controller devices

Abstract

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.

Claims

1. A branch controlling method for a mobile station capable of treating a plurality of calls simultaneously, characterized in that when a new call occurs while the mobile station treats an existent call, at least either of branch structures for both of the calls or at least either of communication frequency bands for both of the calls is controlled, so that the branch structures are the same as each other and the communication frequency bands are the same as each other.

2. A method according to claim 1, wherein the existent call is assigned to diversity handover branches and the new call is also assigned to the same diversity handover branches if possible.

3. A branch controlling method for a mobile station capable of treating a plurality of calls simultaneously, characterized in that when a new call occurs while the mobile station treats an existent call, the a branch structure and a communication frequency band, being the same as those for the existent call, are assigned to the new call.

4. A mobile station capable of treating a plurality of calls simultaneously, characterized in that when a new call occurs while the mobile station treats an existent call, the mobile station uses a branch structure and a communication frequency band, being the same as those for the existent call, for the new call in accordance with an instruction from a network.

5. A base station controller adapted for a mobile station capable of treating a plurality of calls simultaneously, characterized in that when a new call occurs while the mobile station treats an existent call, the base station controller controls at least either of branch structures for both of the calls or at least either of communication frequency bands for both of the calls, so that the branch structures are the same as each other and the communication frequency bands are the same as each other.

6. A base station controller adapted for a mobile station capable of treating a plurality of calls simultaneously, characterized in that when a new call occurs while the mobile station treats an existent call, the base station controller assigns a branch structure and a communication frequency band, being the same as that for the existent call, to the new call.

7. A branch controlling method adapted for a mobile station capable of treating a plurality of calls simultaneously, characterized in that when a new call occurs while the mobile station treats an existent call and when it is impossible to assign a branch structure or a communication frequency band, being the same as the branch structure or the communication frequency band for the existent call, to the new call, another branch structure or another communication frequency band which can continue both of the existent and new calls is selected, and the selected branch structure or communication frequency band is assigned to both of the existent and new calls.

8. A mobile station capable of treating a plurality of calls simultaneously, characterized in that when a new call occurs while the mobile station treats an existent call and when it is impossible to assign a branch structure or a communication frequency band, being the same as the branch structure or the communication frequency band for the existent call, to the new call, the mobile station assigns another branch structure or another communication frequency band, which can continue both of the existent and new calls, to both of the existent and new calls in accordance with an instruction from a network.

9. A base station controller adapted for a mobile station capable of treating a plurality of calls simultaneously, characterized in that when a new call occurs while the mobile station treats an existent call and when it is impossible to assign a branch structure or a communication frequency band, being the same as the branch structure or the communication frequency band for the existent call, to the new call, the base station controller selects another branch structure or another communication frequency band which can continue both of the existent and new calls, and assigns the selected branch structure or communication frequency band to both of the existent and new calls.