Method and system for mobile communications
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Accused Products
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.
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Citations
82 Claims
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1-78. -78. (canceled)
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79. A method for determining a radio zone and an uplink transmission power, characterized in that
each of base stations transmits broadcast information indicating a perch channel transmission power level and an uplink interference level via a corresponding perch channel; - and
a mobile station receives the broadcast information from near base stations around the mobile station;
detects respective reception levels of the perch channels for the near base stations;
calculates respective path losses between the mobile station and respective near base stations on the basis of the respective reception levels and the respective perch channel transmission power levels within the broadcast information;
calculates respective necessary uplink transmission power levels between the mobile station and respective near base stations on the basis of the calculated respective path losses, the respective uplink interference levels within the broadcast information; and
required signal-to-interference ratios involved in reception by the near base stations;
selects a radio zone in which the necessary uplink transmission power level is minimum among the respective necessary uplink transmission power levels, the base station of the selected radio zone being ready for communication with the mobile station or being able to commence communication with the mobile station after handover; and
controls an uplink transmission power in the selected radio zone based on the necessary uplink transmission power level of the selected radio zone.
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80. A base station comprising means for transmitting broadcast information indicating a perch channel transmission power level and an uplink interference level via a perch channel.
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81. A mobile station characterized in that it
receives broadcast information from near base stations around the mobile station via respective perch channels, the broadcast information from each of the near base stations indicating a perch channel transmission power level and an uplink interference level; -
detects respective reception levels of the perch channels for the near base stations;
calculates respective path losses between the mobile station and respective near base stations on the basis of the respective reception levels and the respective perch channel transmission power levels within the broadcast information;
calculates respective necessary uplink transmission power levels between the mobile station and respective near base stations on the basis of the calculated respective path losses, the respective uplink interference levels within the broadcast information, and respective signal-to-interference ratios involved in reception by the respective near base stations;
selects a radio zone of which the necessary uplink transmission power level is minimum among the respective necessary uplink transmission power levels, the base station of the selected radio zone being ready for communication with the mobile station or being able to commence communication with the mobile station after handover; and
controls an uplink transmission power in the selected radio zone based on the necessary uplink transmission power level of the selected radio zone.
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82-99. -99. (canceled)
Specification