Signaling Requirements to Support Interference Coordination in OFDMA Based Systems
AssigneeTexas Instruments Incorporated
InventorAris Papasakellariou
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Abstract
The invention provide methods for classifying user equipments (UEs) communicating with a serving base station (Node B) according to their experienced average interference in subsets of frequency or time resources. The classification utilizes existing channel quality indication (CQI) reports the UEs send to their serving Node B for the purposes of data scheduling. Multiple CQI reports are averaged to practically eliminate short term variations caused by fast fading and capture the long term interference and signal-to-interference and noise ratio (SINR) that the UEs experience. By capturing this average interference and SINR, a reference Node B can apply interference co-ordination through fractional frequency reuse or fractional time reuse.
Claims14
In a cellular network having a plurality of Node Bs, a method to perform scheduling of user equipments (UEs) communicating with a reference Node B from said plurality of Node Bs, said method comprising:
- receiving a plurality of metrics at said reference Node B from at least one of said UEs wherein each of said plurality of metrics indicates a signal quality;
- averaging said plurality of metrics at said reference Node B;
- and
- scheduling at said reference Node B a signal transmission to or from said at least one of said UEs using resources from a subset of resources, said subset of resources determined from a set of resources by said averaging of said plurality of metrics.
In a cellular network comprising a plurality of Node Bs, a method to classify UEs communicating with a reference Node B from said plurality of Node Bs according to the average interference said UEs experience in their signal transmission or reception, said method comprising:
- at least one of said UEs computing a metric indicating a signal quality;
- periodically sending said metric to said reference Node B;
- receiving a plurality of said metrics at said reference Node B;
- averaging said a plurality of said metrics at said reference Node B;
- and
- determining at said reference Node B the average interference experienced by the signal transmission or reception for said at least one of said UEs in a set of resources from said averaging of multiple said metrics.
Dependencies are inferred from the claim text.