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| Multiplexing digital communication system |
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| Distributed clocking system |
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| Distributed clocking system |
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| Docking station |
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Method and apparatus for determining the assignment of a mobile station to equipment lists
| Details |
Inventors: Pfundstein, Matthias;
Assignee: Alcatel SEL Aktiengesellschaft (Stuttgart, DE)
Primary Examiner: Eisenzopf; Reinhard J.
Assistant Examiner: Nguyen; Lee
Attorney, Agent or Firm: Ware, Fressola, Van Der Sluys & Adolphson
In the prior art, equipment lists (B, G, W) are searched successively, or a list is searched which contains all equipment numbers (MEI.sub.1 to MEI.sub.n) along with the respective equipment lists to which they are assigned. Thus mobile stations (MEI.sub.1 to ME.sub.n) are assigned to one of several equipment lists (B, G, W; black, grey, white list). This assignment must be checked by the mobile switching center (MSC) prior to the establishment of a connection. The present method uses an algorithm where each equipment number (MEI.sub.1 to MEI.sub.n) is assigned a search key (KEY.sub.1 to KEY.sub.p ; KEY) such that groups of equipment numbers (MEI.sub.1 to MEI.sub.n) correspond with a respective one of the search keys (KEY.sub.1 to KEY.sub.p ; KEY), and that the search key (KEY.sub.1 to KEY.sub.p ; KEY) covers a number of different structural elements (S.sub.1 to S.sub.q ; DAT). In a corresponding apparatus for determining the assignment of a mobile station (ME.sub.1 to ME.sub.n) to equipment lists (B, G, W) containing a number of equipment numbers (MEI.sub.1 to MEI.sub.n), a memory device (MEM) has as a memory device for different structural elements (S.sub.1 to S.sub.q ; DAT), and the controller is provided with a converting device (GEN) for generating a search key (KEY.sub.1 to KEY.sub.p ; KEY) from an equipment number (MEI.sub.1 to MEI.sub.n), with a comparator (COMP) for determining the association of an equipment number (MEI.sub.1 to MEI.sub.n) with a structural element (S.sub.1 to S.sub.q ; DAT), and has an access device (ACC) for reading different structural elements (S.sub.1 to S.sub.q ; DAT) from the memory device (MEM), the access device (ACC) being designed to access the structural elements (S.sub.1 to S.sub.q ; DAT) by means of a search key (KEY.sub.1 to KEY.sub.p ; KEY). |
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DETAILED DESCRIPTION It is the object of the invention to determine which equipment list a mobile station is assigned to.
The invention takes account of the recognition that the assignment of equipment numbers to equipment lists is not completely random.
For example, adjacent equipment numbers frequently belong to the same equipment list, preferably to the white list.
The equipment numbers of the black list mostly stand alone.
Thus, when assigning equipment numbers to equipment lists, these differing characteristics should be taken into account.
The fundamental idea of the invention is to describe the assignment of the equipment numbers to the equipment lists by means of structural elements, and to access the structural elements by means of search keys.
A structural element is a data structure which assigns an equipment number or a range of equipment numbers to an equipment list.
A search key addresses several of these structural elements.
This also has the advantage that equipment numbers can be represented in the structural elements in shortened form, since the search key already represents part of the address of an equipment number.
The invention thus offers the advantage that through the use of structural elements and search keys, the size of a data set required to represent the assignment of the equipment numbers to the equipment lists is reduced.
The use of search keys also speeds up the search for a given equipment number, since the range of numbers to be searched is greatly reduced.
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Multiplexer-related 
