Best server selection in layered cellular radio system
First Claim
1. A method of performing server selection for a mobile station operating within a cellular radio system in a region in which radio channels are provided by cells having different service areas, said method comprising:
- providing for the mobile station a list of neighboring cells;
assigning a threshold radio channel signal strength level which is acceptable for service of a mobile station in each of said neighboring cells;
assigning to each of said neighboring cells on said list a category of preference with respect to a currently serving cell;
measuring the strength of the radio signals providing communication between the mobile station and the base station of each of the neighboring cells; and
selecting as a server for the mobile station the base station of a neighboring cell on said list whose preference category is preferred with respect to the currently serving cell and whose measured strength of the radio signal providing communication therewith is greater than the assigned threshold radio channel signal strength level by a largest margin in comparison to other preferred neighboring cells.
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Abstract
A multi-level layered cellular radio architecture serves mobile subscriber stations moving within the system. Best server selection is performed for the mobile stations by assigning within each cell a preference value to each other one of the cells with which is associated by proximity of service area. The strength of the radio signal received by the mobile from the serving cell as well as the radio channels of associated cells is measured. A decision as to the best serving cell for the mobile station is made based upon both the preference value of the associated cells and the signal strength of their respective radio channels.
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Citations
20 Claims
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1. A method of performing server selection for a mobile station operating within a cellular radio system in a region in which radio channels are provided by cells having different service areas, said method comprising:
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providing for the mobile station a list of neighboring cells; assigning a threshold radio channel signal strength level which is acceptable for service of a mobile station in each of said neighboring cells; assigning to each of said neighboring cells on said list a category of preference with respect to a currently serving cell; measuring the strength of the radio signals providing communication between the mobile station and the base station of each of the neighboring cells; and selecting as a server for the mobile station the base station of a neighboring cell on said list whose preference category is preferred with respect to the currently serving cell and whose measured strength of the radio signal providing communication therewith is greater than the assigned threshold radio channel signal strength level by a largest margin in comparison to other preferred neighboring cells. - View Dependent Claims (2)
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3. A method of performing server selection for a mobile station operating within a cellular radio system in a region in which radio channels are provided by multiple levels of cells, each of said cells being provided with radio service by a base station the broadcast power of which and the resultant service area which varies in size from larger for higher level cells to smaller for lower level cells, said method comprising:
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providing for the mobile station a list of neighboring cells; assigning a threshold radio channel signal strength value which is acceptable for service to a mobile station in each of said neighboring cells; measuring the strength of the radio signals providing communication between the mobile station and the base station of each of the neighboring cells; and selecting as a server for the mobile station from among the neighboring cells the cell having both the smallest relative service area size and a measured radio signal strength which is greater than the threshold radio channel signal strength by a largest margin in comparison to other smallest neighboring cells.
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4. A method for control channel reselection in a cellular telephone system including a plurality of cells, the plurality of cells including, with respect to a given cell associated with a currently selected control channel, an identified plurality of neighboring cells each being assigned a signal strength threshold and a category of preference with respect to the given cell, comprising the steps of:
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filtering the identified plurality of neighboring cells to determine candidate cells for control channel reselection which have a measured signal strength exceeding their assigned signal strength threshold and have a category of preference of preferred over the given cell; and choosing for control channel reselection the candidate cell whose measured signal strength exceeds its assigned signal strength threshold by a best margin in comparison to other preferred neighboring cells. - View Dependent Claims (5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15, 16, 17, 18)
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19. A method for filtering a plurality of neighboring cells to determine candidate cells for control channel reselection in a cellular telephone system, the plurality of neighboring cells each being assigned a signal strength threshold and a category of preference with respect to a given cell associated with a currently selected control channel, comprising the steps of:
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measuring received signal strength with respect to each of the identified plurality of neighboring cells; determining the category of preference with respect to each of the identified plurality of neighboring cells; and identifying as candidate cells for control channel reselection those ones of the identified plurality of neighboring cells which have a measured received signal strength exceeding their assigned signal strength threshold and have a category of preference of preferred over the given cell. - View Dependent Claims (20)
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Specification