Method and system for mobile communications

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.

Description

TECHNICAL FIELD [0001] The present invention generally relates to a method and system for mobile communication and especially relates to a method and system adopted to transmission of various sorts of data in accordance with the development of multimedia. BACKGROUND ART [0002] Conventionally, portable telephones have been widely spread, and TDMA (time division multiple access) and FDMA (frequency division multiple access) were used for access methods for portable telephones. In these days, CDMA (code division multiple access) is being adopted instead of TDMA and FDMA because of various merits, such as high efficiency at usage of frequency band, facility of change of transmission rate, and preservation from eavesdropping. [0003] However, CDMA according to prior art is prepared mainly for voice transmission and therefore is not suitable for data communication. In recent years, as the development of multimedia, not only voice but also various kinds of data that can be processed in comp...

AI Technical Summary

Benefits of technology

[0021] Additionally, the present invention provides a method for controlling a system for mobile communication including a mobile station which is able to conduct diversity reception, a plurality of radio base stations, and a base station controller communicating via the radio base stations under control of a switching center, the method comprising the steps of: enciphering information that should be processed only in one or more layers which are the same as or higher than layer 3 of the OSI reference model; and facilitating notification between layers of different devices corresponding to layer 2 of the OSI reference model about an onset of transmission of enciphered information.

[0125] By virtue of the aspects of the invention as set forth, it is possible to minimize the number of reassignments or rearrangements of code resources for channels, and call generations do not involve the rearrangement of code resource. Therefore, it is possible to reduce connection time delay.

Problems solved by technology

However, CDMA according to prior art is prepared mainly for voice transmission and therefore is not suitable for data communication.

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