Intracell handover with antenna arrays
AssigneeTelefonaktiebolaget LM Ericsson
InventorsUlf Forssen, Bjorn Gudmundsson
Life of this patent
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Abstract
An intra-cell handover method in a cellular communication system which utilizes spatial information from an antenna array is disclosed. The spatial information is measured with the antenna array. A determination is then made on whether an intra-cell handover is desirable for a mobile station based upon said measured spatial information. The mobile station is then handed over from a first channel to a second channel when desirable and spatial filters in transceivers for mobile stations using the first and second channels are computed based on the spatial information.
Claims21
An intra-cell handover method in a cellular communication system having adaptive antenna arrays, comprising the steps of:
- measuring spatial information inside a sector with an antenna array;
- determining whether an intra-cell handover is desirable for a mobile station based upon said measured spatial information;
- handing over said mobile station from a first channel to a second channel within the same sector when desirable;
- and
- computing spatial filters in transceivers for said mobile station and other mobile stations operating on the first and second channels based on the measured spatial information.
An intra-cell handover method in a cellular communication system having adaptive antenna arrays, comprising the steps of:
- measuring spatial information inside a sector with an antenna array;
- determining whether an intra-cell handover is desirable for a mobile station based upon said measured spatial information;
- handing over said mobile station from a first channel to a second channel within the same sector when desirable;
- and
- computing spatial filters in transceivers for mobile stations using the first channel based on the measured spatial information.
An intra-cell handover method in a cellular communication system having adaptive antenna arrays, comprising the steps of:
- determining whether an intra-cell handover is necessary;
- measuring the power level of a mobile station which needs to be handed off;
- assigning said mobile station to a channel based upon said measured power level;
- computing the relative uplink disturbance on the mobile station;
- computing the relative uplink disturbance on other mobiles from said mobile station;
- computing the downlink disturbance to check existing downlinks;
- selecting a best channel using said computed information;
- and
- modifying spatial filters of all transceivers using the selected channel and the old channel according to new disturbance situation.
Dependencies are inferred from the claim text.