Abstract:
PROBLEM TO BE SOLVED: To reduce search time during handover between different frequencies.SOLUTION: Increased forward link power control indices are increased, and a first part of a first frame in a pair of frames selected by discrimination at an increased power level. Forward transmission is suspended in a period of a second part of a first frame in the selected pair of frames and in that of a first part of a second frame in the selected pair of frames, and a second part of a second frame in the selected pair of frames is transmitted at a power level determined by the increased forward link power control indices.
Abstract:
PROBLEM TO BE SOLVED: To provide a method and apparatus for coordinating the time at which a mobile station performs searches for alternative systems to which a hard handoff will occur.SOLUTION: In one system, the mobile station receives a command which instructs the mobile station as to when to tune to alternative frequencies in order to search for indications of the presence of an alternative system. In the alternative system, predetermined times are defined with respect to a reference point in time that is common to both the origination base station and a mobile station. The mobile station tunes to the alternative frequencies to perform searches only during these predetermined times. In addition, the mobile station coordinates the transmission of reports which indicate the results of searches for the alternative systems such that these reports are only transmitted from the mobile station when the mobile station is tuned to the origination frequency.
Abstract:
A method and apparatus for coordinating the time at which a mobile station (5) performs searches for alternative systems to which a hard handoff will occur. In one system which includes the present invention, the mobile station (5) receives a command which instructs the mobile station (5) as to when to tune to alternative frequencies in order to search for indications of the presence of an alternative system. In another system which includes the present invention, predetermined times are defined with respect to a reference point in time that is common to both an origination base station (10) and a mobile station (5). The mobile station (5) tunes to alternative frequencies to perform searches only during these predetermined times. In addition, the mobile station (5) coordinates the transmission of reports which indicate the results of searches for alternative systems such that these reports are only transmitted from the mobile station (5) when the mobile station (5) is tuned to the origination frequency.
Abstract:
A method and apparatus are provided for coordinating times at which a mobile station (5) monitors alternative frequencies with times at which an origination base station (10) transmits short messages. The origination base station (10) determines when the mobile station (5) can be tuned to frequencies other than an origination frequency and transmits a signal commanding the mobile station to tune to an alternative frequency at a particular time. The mobile station (5) first receives commands from the origination base station (10). The commands indicate when the mobile station (5) can be tuned to receive frequencies other than an origination frequency. Based on the commands, the mobile station (5) can select time periods during which it will be tuned to frequencies other than the origination frequency. Short messages are transmitted from the origination base station (10) only at times when the mobile station (5) is known to be tuned to receive the origination frequency based on the knowledge of when the mobile station will be tuned to frequencies other than the origination frequency. A window may be created during which the mobile station (5) can cease receiving information over the origination frequency without any reduction in a total amount of data.