Location determination and handover in mobile radio systems
First Claim
1. A system for determining the location of a mobile unit in a micro-cellular radio network having a plurality of base stations each providing radio coverage over a respective micro-cell and able to communicate with mobile units within the respective micro-cell, the system comprising:
- means for storing with respect to each of one or more locations a corresponding order pair of measured distance and measured signal characteristic associated with that location;
means for forming a current order pair for a mobile unit including means for determining a current distance of a mobile unit from a base station and means for measuring a current characteristic of a radio signal transmitted between a mobile unit and a base station; and
means for comparing a stored order pair with a current order pair for the mobile unit to determine the current location of the mobile unit.
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Accused Products
Abstract
A handover initiation system for a cellular radio network comprises means for determining both the distance of a mobile user from a cell base station based on propagation delay techniques and means for measuring the signal strength to determine the path taken by the mobile user. In a busy area microcells are constituted by single streets. The propagation characteristics of adjoining streets in a larger macrocell can be distinguished from the propagation characteristics of the street constituting the micro-cell such that the handover initiation of a mobile user within one of the surrounding streets can be determined.
401 Citations
20 Claims
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1. A system for determining the location of a mobile unit in a micro-cellular radio network having a plurality of base stations each providing radio coverage over a respective micro-cell and able to communicate with mobile units within the respective micro-cell, the system comprising:
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means for storing with respect to each of one or more locations a corresponding order pair of measured distance and measured signal characteristic associated with that location; means for forming a current order pair for a mobile unit including means for determining a current distance of a mobile unit from a base station and means for measuring a current characteristic of a radio signal transmitted between a mobile unit and a base station; and means for comparing a stored order pair with a current order pair for the mobile unit to determine the current location of the mobile unit. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9)
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10. A base station for a mobile radio network including:
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receiving means for receiving a signal; control means for controlling calls to and from mobile units; means for determining the distance of the mobile unit from the base station; means for storing a set of signal characteristics of at least one possible mobile unit path in the area around the base station, each constituent of the set being associated with a location on the path; means for determining the presence of a constituent of the set of signal characteristics in the received signal; means for combining the determined distance with the presence of said constituent to identify the location of the mobile unit on a particular path based on the stored set; and means for initiating a handover from one base station to another base station on the basis of the identified location. - View Dependent Claims (11, 12)
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13. A method for determining the location of a mobile unit in a micro-cellular radio network having a plurality of base stations each providing radio coverage over a respective micro-cell and able to communicate with mobile units within the respective micro-cell, the method comprising:
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storing with respect to each of one or more locations a corresponding order pair of measured distance and measured signal characteristic associated with that location; forming a current order pair for a mobile unit by determining a current distance of a mobile unit from a base station and measuring a current characteristic of a radio signal transmitted between a mobile unit and a base station; and comparing a stored order pair with a current order pair for the mobile unit to determine the current location of the mobile unit. - View Dependent Claims (14, 15, 16, 17, 18)
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19. A method for determining the location of a mobile radio transceiver with respect to a fixed base station radio transceiver in a cellular radio-telephone network, said method comprising the steps of:
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measuring the relative signal propagation time between said mobile and fixed base radio transceivers; measuring a further signal characteristic for signals propagated between said mobile and fixed base radio transceivers; and processing said measured signal propagation time and said measured further signal characteristic with predetermined and pre-stored data to determine the location of the mobile radio transceiver. - View Dependent Claims (20)
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Specification