CELL SELECTION IN MOBILE RADIO SYSTEMS
First Claim
1. A method for cell selection in a cellular mobile communications system having a plurality of cells, each with at least one Base Station, and a Mobile Station for communicating with said mobile system, using an air interface scheme supported by the at least one Base Station and the Mobile Station, through an air interface link to one of said at least one Base Stations, comprising the steps of:
- measuring the quality of the links between said Mobile Station and said Base Stations;
said method characterized by further comprising the following steps;
determining the communications capabilities of said Base Stations and of said Mobile Station;
estimating a Quality of Service value for each possible link between said Mobile Station and said Base Stations; and
selecting the cell with the Base Station having the highest estimated Quality of Service.
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Accused Products
Abstract
The present invention relates generally to the problem of cell selection, for e.g. cell handover, in mobile telecommunication systems, and more particularly to the problem of selecting the optimum cell among cells with differing capabilities due to different air interface modes. Known algorithms for cell selection and handover are extended by applying additional criteria that take into account the capabilities, due to different modulation and coding schemes, of the mobile station and the base stations that are possible candidates. The quality of service (“QoS”) is predicted for the different cell candidates based on a combination of signal strength or C/I, different cell capabilities, multislot capability, etc. Then the cell is selected for which the predicted QoS is maximum. In another embodiment the invention is extended by taking into account further criteria which are suitable from a system point of view, e.g. to avoid a significant increase of average outage probability or interference level. The present invention increases the use of base stations supporting high data rates. The result is an increase in overall system throughput.
109 Citations
22 Claims
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1. A method for cell selection in a cellular mobile communications system having a plurality of cells, each with at least one Base Station, and a Mobile Station for communicating with said mobile system, using an air interface scheme supported by the at least one Base Station and the Mobile Station, through an air interface link to one of said at least one Base Stations, comprising the steps of:
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measuring the quality of the links between said Mobile Station and said Base Stations;
said method characterized by further comprising the following steps;
determining the communications capabilities of said Base Stations and of said Mobile Station;
estimating a Quality of Service value for each possible link between said Mobile Station and said Base Stations; and
selecting the cell with the Base Station having the highest estimated Quality of Service. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15, 16, 17, 18, 19, 20)
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21. A system for cell selection in a cellular mobile communications system having a plurality of cells, each with at least one Base Station, and a Mobile Station for communicating with said mobile system through an air interface link to one of said at least one Base Stations, comprising:
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means for measuring the quality of the links between said MS and said Base Stations;
and further characterized by said Mobile Station and said Base Stations supporting at least one air interface scheme;
means for determining the capabilities of said Base Stations and of said Mobile Station;
means for estimating a Quality of Service value for each possible link between said Mobile Station and said Base Stations; and
means for selecting the cell with the Base Station having the highest estimated Quality of Service. - View Dependent Claims (22)
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Specification