Patent ID: 8358631
Filing Date: 2013-01-22
Classification: H04B,H04W

Abstract:
1. A method performed by a controller for determining a beam forming vector for use in transmitting data from a transmission point to a first mobile device connected to the transmission point, comprising: (A) determining a first set of beam forming vectors using a first set of virtual dual uplink transmit powers, wherein the first set of beam forming vectors comprises a first beam forming vector for the first mobile device and a first beam forming vector for a second mobile device; (B) determining a first set of downlink transmit powers and a first maximum worst-case signal to interference-plus-noise ratio (SINR) margin defined by using the first set of beam forming vectors, wherein the first set of downlink transmit powers comprises a first downlink transmit power for the first mobile device and a first downlink transmit power for the second mobile device; (C) determining a second set of virtual dual uplink transmit powers using the first maximum worst-case SINR margin, wherein the first set of virtual dual uplink transmit powers comprises a first virtual dual uplink transmit power for the first mobile device and a first virtual dual uplink transmit power for the second mobile device; (D) determining a second set of beam forming vectors using the second set of virtual dual uplink transmit powers, wherein the second set of beam forming vectors comprises a second beam forming vector for the first mobile device and a second beam forming vector for the second mobile device; (E) determining a second set of downlink transmit powers and a second maximum worst-case SINR margin defined by using the second set of beam forming vectors, wherein the second set of downlink transmit powers comprises a second downlink transmit power for the first mobile device and a second downlink transmit power for the second mobile device; and (F) determining whether the maximum worst-case SINR margin has converged using the first maximum worst-case SINR margin and the second maximum worst-case SINR margin.