GRANT UTILIZATION BASED OTHER CELL INTERFERENCE ESTIMATION

摘要

Mobile broadband traffic has been exploding in wireless networks resulting in an increase of interferences and reduced operator control. Networks are also becoming more heterogeneous putting additional demand in interference management. Scheduler schedules uplink transmissions from based on a load prediction algorithm that typically assumes worst case. However, UEs do not always use full power granted, and thus, much of granted radio resources are wasted. To address these and other issues, technique(s) to accurately predict/estimate other cell interferences and thermal noise separately and to accurately predict/estimate grant utilization probability and variance is(are) described. Inventive estimation technique(s) can be used to schedule UEs to more fully utilize available radio resources. Extended Kalman filtering can be adapted for use in estimation providing low order computational complexity.

主权项

1. A method performed at a radio network node corresponding to a cell of interest in a wireless network, the method comprising:
estimating a grant utilization probability pgrant(t1) based at least on a grant utilization probability estimate {circumflex over (p)}grant(t1) and an interference-and-noise sum estimate {circumflex over (P)}other(t0)+{circumflex over (P)}N(t0) applicable at a time t0 to obtain a grant utilization probability estimate {circumflex over (p)}grant(t1) applicable at a time t1, wherein t1−t0=T>0; estimating an interference-and-noise sum Pother(t1)+PN(t1) based at least on the grant utilization probability estimate {circumflex over (p)}grant(t1) and the interference-and-noise sum estimate {circumflex over (P)}other(t0)+{circumflex over (P)}N(t0) to obtain an interference-and-noise sum estimate {circumflex over (P)}other(t1)+{circumflex over (P)}N(t1) applicable at the time t1; and estimating an other cell interference Pother(t1) based at least on the interference-and-noise sum estimate {circumflex over (P)}other(t1)+{circumflex over (P)}N(t1) and a thermal noise estimate {circumflex over (P)}N(t1) to obtain an other cell interference estimate {circumflex over (P)}other(t1) applicable at the time t1, wherein the grant utilization probability pgrant(t1) expresses a relationships between radio resource grants scheduled to one or more cell terminals and radio resource grants used by the same cell terminals applicable at a time t, each cell terminal being a wireless terminal in the cell of interest, and the grant utilization probability estimate {circumflex over (p)}grant(t) being an estimate thereof, wherein the interference-and-noise sum Pother(t)+PN(t) expresses a sum of undesired signals, other than an own cell load Pown(t), applicable at the time t, and the interference-and-noise sum estimate {circumflex over (P)}other(t)+{circumflex over (P)}N(t) being an estimate thereof, wherein the own cell load Pown(t) expresses a sum of signals due to wireless activities in the cell of interest applicable at the time t, wherein the other cell interference Pother(t) expresses a sum of interferences present in the cell of interest due to wireless activities applicable at the time t in one or more cells other than in the cell of interest, and the other cell interference estimate {circumflex over (P)}other(t) being an estimate thereof, and wherein a thermal noise PN(t) expresses a sum of undesired signals present in the cell of interest at the time t other than the own cell load Pown(t) and other than the other cell interference Pother(t) and the thermal noise estimate {circumflex over (P)}N(t) being an estimate thereof.