Method and system for mobile communications

• US 20060251038A1
• Filed: 04/06/2006
• Published: 11/09/2006
• 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 7,664,507 B2
• Time in Patent Office: Days
• US Class Current: 370/342
• 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 36/302 due to low signal strength
• 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

1-88. -88. (canceled)

89. A radio mobile communication system wherein a plurality of channels can be established on a single carrier frequency by code division multiplex access, characterized in that the system comprises code resource assigning means for assigning at least a part of an assignable code resource to one of the channels in accordance with a transmission rate necessary for the corresponding channel, the part corresponding to a certain bandwidth corresponding to the transmission rate.

90. A radio mobile communication system according to claim 89, further comprising channel-assigning means for assigning one of the channels, to which a part of the assignable code resource is assigned, to a mobile station in accordance with a transmission rate necessary for the mobile station.

91. A radio mobile communication system wherein a plurality of channels can be established on a single carrier frequency by code division multiplex access, characterized in that the system comprises a plurality of assignable code resources, each of code resources corresponding to a certain bandwidth and being independent of the other code resources;

and reassigning means for reassigning a part of an assignable code resource to one of the channels to which a part of another assignable code resource is already assigned if there is not an unused code resource corresponding to a bandwidth suitable for a necessary transmission rate when assigning an unused assignable code resource to one of the channels in accordance with the necessary transmission rate.

92. A radio mobile communication system according to claim 91, further comprising unused-code-resource determining means for determining if there is an unused code resource having a code resource length suitable for a necessary transmission rate or not when assigning an unused assignable code resource to one of the channels in accordance with the necessary transmission rate necessary.

93. A radio mobile communication system according to claim 91, wherein at least one standard code resource corresponding to a predetermined bandwidth is preselected and the system comprises assignment-possibility-determining means for determining at predetermined moments if there is at least one unused standard code resource or not, the reassigning means reassigning a part of an assignable code resource to one of the channels to which a part of another assignable code resource is already assigned until an unused standard code resource is reserved if the determination result by the assignment possibility determining means has been negative.

94. A radio base station for which a plurality of channels can be established on a single carrier frequency by code division multiplex access, characterized in that it comprises code-resource-assignment-possibility-determining means for determining whether or not it is possible to assign at least a part of an assignable code resource to one of channels in accordance with a transmission rate necessary for the corresponding channel, the part corresponding to a certain bandwidth corresponding to the transmission rate.

95. A base station controller for controlling the radio base station according to claim 94, further comprising channel assigning means for assigning a channel, to which a part of assignable code resource is assigned, to a mobile station in accordance with a transmission rate necessary for the mobile station.

96. A method for controlling a radio mobile communication system wherein a plurality of channels can be established on a single carrier frequency by code division multiplex access, characterized in that the method comprises code-resource-assigning step for assigning at least a part of an assignable code resource to one of the channels in accordance with a transmission rate necessary for the corresponding channel, the part corresponding to a certain bandwidth corresponding to the transmission rate.

97. A method for controlling a radio mobile communication system including a plurality of assignable code resources, each of code resources corresponding to a certain bandwidth and being independent of the other code resources, a plurality of channels being capable of being established on a single carrier frequency by code division multiplex access, characterized in that in order to assign an unused assignable code resource to one of the channels in accordance with a necessary transmission rate, the method comprises the steps of

determining whether or not there is an unused code resource having a code resource length in accordance with the necessary transmission rate;

and

reassigning a part of an assignable code resource to one of the channels to which a part of another assignable code resource is already assigned if the determination indicates that there is not an unused code resource having a bandwidth suitable for the necessary transmission rate.

98. A method for controlling radio base station for which a plurality of channels can be established on a single carrier frequency by code division multiplex access, characterized in that it comprises a code-resource-assignment-possibility-determining step for determining whether or not it is possible to assign at least a part of an assignable code resource to one of channels in accordance with a transmission rate necessary for the corresponding channel, the part corresponding to a certain bandwidth corresponding to the transmission rate.

99. A method for controlling a radio base station according to claim 98, comprising a channel assigning step for assigning a channel, to which a part of an assignable code resource is assigned to a mobile station in accordance with a transmission rate necessary for the mobile station.