Patent Document ID: 9338753
Application ID: 14073459
Patent Flag: 1

Claim One:
1. A method for performance management through power control in a wireless backhaul network comprising a plurality of fixed nodes, each node comprising a transmitter, receiver and directional antenna, said nodes being arranged as plurality of hubs and a plurality of Remote Backhaul Modules (RBM), wherein each hub i serves a respective cluster i of a set of RBMs j through hub-RBM wireless radio links ij, comprising both downlink and uplink channels, the method comprising: for each transmit frame, defining one or more power zones, each power zone comprising a set of radio resources operating at one transmit power level P i for cluster i, and such that the same power zone is defined over the same set of radio resources across all other clusters k, wherein the transmit power level P i is between a minimum power level P min and a maximum power level P max , and power zone boundaries are synchronized in time across all clusters of the backhaul network; for each radio link ij, obtaining channel data comprising a channel gain g ij ; for each power zone, determining the transmit power level P i to be applied simultaneously in all clusters using the same set of radio resources, by steps comprising optimization of a weighted sum utility function across the network using a rate expression based on a carrier to interference and noise ratio (CINR) function, wherein the weighted sum utility function across the network comprises a summation of the weighted logarithm of the rate expression plus a non-negative constant value c, and wherein, based on a Newton's method approach, the optimization is defined by: max P i ⁢ ∑ i ⁢ ∑ j ∈ S i ⁢ w ij ⁢ log ⁡ ( log ⁡ ( 1 + CINR ij ) + c ) s. t. ⁢ CINR ij = g ij ⁢ P i Γ ⁡ ( ∑ k ≠ i ⁢ g kj ⁢ P k + α ⁢ ⁢ g ij ⁢ P i + σ ij 2 ) P m ⁢ ⁢ i ⁢ ⁢ n ≤ P i ≤ P ma ⁢ ⁢ x where: S i is the set of RBMs belonging to the network cluster of Hub i in a particular power zone; w ij represents the weight selected for hub i and RBM j; and g ij is the channel gain for radio link ij; selecting the value of c to provide a chosen balance of proportional fairness and data throughput, and applying the respective transmit power level P i simultaneously to each power zone of transmit frames transmitted by hubs and RBMs in all clusters using the same set of radio resources.