Mobile-assisted handoff technique
First Claim
1. A method of estimating handoff of a mobile in a mobile cellular communications system, the system comprising a mobile communicating with a serving base station, there also being a plurality of adjacent base stations transmitting signals, wherein the method comprises the steps of:
- measuring by the mobile signals received from the adjacent base stations to give mobile signal measurements;
reporting the mobile signal measurements to the serving base station;
adjusting at least some of the reported mobile signal measurements to predict measurements that the adjacent base stations would make of signals received from the mobile, to give a set of predicted signal measurements and,comparing at least the set of predicted signal measurements so as to select a preferred adjacent base station for a possible handoff.
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Abstract
A mobile-assisted handoff technique for a cellular mobile communications system. A mobile makes measurements of adjacent base stations and reports the measurements to the serving base station. The measurements are adjusted to predict signal measurements that the adjacent base stations would make of the mobile. A full set of adjusted measurements, or a combined set of adjusted measurements and true measurements, made by those base stations with locate receivers, may be used in determining the best cell to hand-off the mobile to.
54 Citations
13 Claims
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1. A method of estimating handoff of a mobile in a mobile cellular communications system, the system comprising a mobile communicating with a serving base station, there also being a plurality of adjacent base stations transmitting signals, wherein the method comprises the steps of:
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measuring by the mobile signals received from the adjacent base stations to give mobile signal measurements; reporting the mobile signal measurements to the serving base station; adjusting at least some of the reported mobile signal measurements to predict measurements that the adjacent base stations would make of signals received from the mobile, to give a set of predicted signal measurements and, comparing at least the set of predicted signal measurements so as to select a preferred adjacent base station for a possible handoff. - View Dependent Claims (2, 3, 4, 5, 6)
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7. A method of performing handoff of a mobile in a mobile cellular communications system, the system comprising a mobile communicating with a serving base station, there also being a plurality of adjacent base stations transmitting signals, wherein the method comprises the steps of:
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monitoring by the serving base station quality of communication with the mobile; measuring by the mobile signals received from the adjacent base stations to give mobile signal measurements; reporting the mobile signal measurements to the serving base station; adjusting at least some of the reported mobile signal measurements to predict signal measurements that the adjacent base stations would make of signals received from the mobile to give a set of predicted signal measurements; comparing, in response to the quality of communication with the mobile changing, at least the set of predicted signal measurements so as to select a preferred adjacent base station associated with the best signal measurement and, handing off the mobile to the preferred base station. - View Dependent Claims (8, 9, 10)
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11. A mobile cellular communications system comprising a mobile communicating with a serving base station, there also being a plurality of adjacent base stations transmitting signals, wherein:
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the mobile includes measuring means to measure signals received from the base stations and reporting means to report the signal measurements to the serving base station, and the network further includes; computing means to predict, from the signal measurements reported by the mobiles, signal measurements that the adjacent base stations would make of signals received from the mobile to give a set of predicted signal measurements; comparison means to compare at least the set of predicted signal measurements and to select a preferred base station associated with the best signal measurement. - View Dependent Claims (12, 13)
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Specification