Abstract: Systems and methods are disclosed herein that related to determining and using a codebook in a virtualized Active Antenna System (AAS). In some embodiments, a first radio node that is configured to communicate with a second radio node comprises a radio interface and processing circuitry configured to transform a first codebook that is in a non-virtualized antenna domain to a second codebook that is in a virtualized antenna domain based on a port to antenna mapping matrix used to transform a signal from the virtualized antenna domain to the non-virtualized antenna domain prior to transmission of the signal in a corresponding virtualized cell or sector. The processing circuitry is further configured to receive a transmit signal from the second radio node to thereby provide a received signal and perform Precoding Matrix Indication (PMI) estimation based on the received signal using the second codebook in the virtualized antenna domain.

Abstract: Systems and methods are disclosed herein that related to determining and using a codebook in a virtualized Active Antenna System (AAS). In some embodiments, a first radio node that is configured to communicate with a second radio node comprises a radio interface and processing circuitry configured to transform a first codebook that is in a non-virtualized antenna domain to a second codebook that is in a virtualized antenna domain based on a port to antenna mapping matrix used to transform a signal from the virtualized antenna domain to the non-virtualized antenna domain prior to transmission of the signal in a corresponding virtualized cell or sector. The processing circuitry is further configured to receive a transmit signal from the second radio node to thereby provide a received signal and perform Precoding Matrix Indication (PMI) estimation based on the received signal using the second codebook in the virtualized antenna domain.

Abstract: Uplink traffic control device, method and computer program product to determine that predictive scheduling is to be applied for the mobile station. Thereafter an uplink transmission scheme is determined for the predictive scheduling. Thereafter, periodic messages comprising uplink transmission grants, according to the uplink transmission scheme, are sent to the mobile station, the messages further comprising a request for a downlink channel quality indicator (CQI) report.

Abstract: A radio access node comprises four logical antenna ports respectively mapped to four physical antennas. Responsive to a loss of data transmission from one of the four physical antennas, the radio access node transmits reference signals representing the four logical antenna ports on the remaining three physical antennas. Each reference signal represents a respective antenna port of the four logical antenna ports. The radio access node also scales transmission power of a physical antenna transmitting more than one of the reference signals based on the number of the reference signals the physical antenna transmits.

Abstract: Uplink traffic control device, method and computer program product to determine that predictive scheduling is to be applied for the mobile station. Thereafter an uplink transmission scheme is determined for the predictive scheduling. Thereafter, periodic messages comprising uplink transmission grants, according to the uplink transmission scheme, are sent to the mobile station, the messages further comprising a request for a downlink channel quality indicator (CQI) report.

Abstract: Uplink traffic control device, method and computer program product to determine that predictive scheduling is to be applied for the mobile station. Thereafter an uplink transmission scheme is determined for the predictive scheduling. Thereafter, periodic messages comprising uplink transmission grants, according to the uplink transmission scheme, are sent to the mobile station, the messages further comprising a request for a downlink channel quality indicator (CQI) report.

Abstract: A radio access node comprises four logical antenna ports respectively mapped to four physical antennas. Responsive to a loss of data transmission from one of the four physical antennas, the radio access node transmits reference signals representing the four logical antenna ports on the remaining three physical antennas. Each reference signal represents a respective antenna port of the four logical antenna ports. The radio access node also scales transmission power of a physical antenna transmitting more than one of the reference signals based on the number of the reference signals the physical antenna transmits.

Abstract: Uplink traffic control device, method and computer program product to determine that predictive scheduling is to be applied for the mobile station. Thereafter an uplink transmission scheme is determined for the predictive scheduling. Thereafter, periodic messages comprising uplink transmission grants, according to the uplink transmission scheme, are sent to the mobile station, the messages further comprising a request for a downlink channel quality indicator (CQI) report.

Abstract: The disclosure relates to a method, performed in a multi-antenna radio access node comprising four logical antenna ports mapped to corresponding physical antennas, of transmitting data using three physical antennas. The method comprises determining (S51) loss of data transmission from one physical antenna of the four physical antennas. A required multi-antenna transmission scheme is determined (S52). An antenna mapping matrix prestored in the radio access node is selected (S53), the selected antenna mapping matrix adapted to the required multi-antenna transmission scheme. Data on the four logical antenna ports are re-mapped (S54) to the remaining three physical antennas by using the selected antenna mapping matrix, whereupon the data is transmitted (S55) from the remaining three physical antennas.

Abstract: Uplink traffic control device, method and computer program product to determine that predictive scheduling is to be applied for the mobile station. Thereafter an uplink transmission scheme is determined for the predictive scheduling. Thereafter, periodic messages comprising uplink transmission grants, according to the uplink transmission scheme, are sent to the mobile station, the messages further comprising a request for a downlink channel quality indicator (CQI) report.

Abstract: The embodiments herein provide a method and apparatus for scheduling users of a communication system, based on an advantageous pre-scheduling scheme. As a first scheduler process during a current scheduling interval, first users selected for scheduling in the current scheduling interval are regularly scheduled to thereby make radio resource reservations for the first users. As a second scheduler process during the current scheduling interval, second users not among the first users are identified as having scheduling deadlines falling in a subsequent scheduling interval. As a further operation of the second scheduler process, the second users for the subsequent scheduling interval are prescheduled to thereby make radio resource reservations in the subsequent scheduling interval for the second users. The second scheduling may be performed using processing resources that would otherwise be left idle by the first scheduler process during the current scheduling interval.

Abstract: The disclosure relates to a method, performed in a multi-antenna radio access node comprising four logical antenna ports mapped to corresponding physical antennas, of transmitting data using three physical antennas. The method comprises determining (S51) loss of data transmission from one physical antenna of the four physical antennas. A required multi-antenna transmission scheme is determined (S52). An antenna mapping matrix prestored in the radio access node is selected (S53), the selected antenna mapping matrix adapted to the required multi-antenna transmission scheme. Data on the four logical antenna ports are re-mapped (S54) to the remaining three physical antennas by using the selected antenna mapping matrix, whereupon the data is transmitted (S55) from the remaining three physical antennas.

Abstract: Uplink traffic control device, method and computer program product to determine that predictive scheduling is to be applied for the mobile station. Thereafter an uplink transmission scheme is determined for the predictive scheduling. Thereafter, periodic messages comprising uplink transmission grants, according to the uplink transmission scheme, are sent to the mobile station, the messages further comprising a request for a downlink channel quality indicator (CQI) report.

Abstract: The present disclosure concerns a method, uplink traffic control device and computer program product. The method comprises determining that predictive scheduling is to be applied for the mobile station. Thereafter an uplink transmission scheme is determined for the predictive scheduling. Thereafter periodic messages comprising uplink transmission grants, according to the uplink transmission scheme, are sent to the mobile station, said messages further comprising a request for a downlink channel quality indicator, CQI, report.

Abstract: In a mobile communication network, a radio node and related method for reducing a signal-to-noise-and-interference ratio (SINR) requirement for a transmission in a scheduling interval. The node estimates a frequency resource utilization in the scheduling interval and compares the estimated utilization with a first threshold. When the estimated utilization is equal to or below the first threshold, the node increases the frequency resource utilization for the transmission, and adjusts a link adaptation for the transmission based on the increased frequency resource utilization. Optionally, the node may decrease the transmit power for the scheduling interval based on the adjusted link adaptation.

Abstract: A low power RBS and a method therein for scheduling downlink transmission to a UE are provided. The low power RBS is associated to at least one macro RBS and the low power RBS is configured to provide radio coverage in a cell of a heterogeneous cellular communication network for scheduling downlink transmissions to a UE connected to the low power RBS. The method comprises receiving (210) a measurement report comprising a channel quality measurement from the UE and adjusting (220) a current SINR value based on the received measurement report for a period of an Almost Bland Subframe, ABS, of the macro RBS. The method further comprises determining (230) downlink transmission parameters based on the adjusted SINR value, and scheduling (240) a downlink transmission to the UE in a subframe of the low power RBS coinciding with an ABS of the macro RBS using the determined downlink transmission parameters.

Abstract: The present disclosure concerns a method, uplink traffic control device and computer program product. The method comprises determining that predictive scheduling is to be applied for the mobile station. Thereafter an uplink transmission scheme is determined for the predictive scheduling. Thereafter periodic messages comprising uplink transmission grants, according to the uplink transmission scheme, are sent to the mobile station, said messages further comprising a request for a downlink channel quality indicator, CQI, report.

Abstract: In a mobile communication network, a radio node and related method for reducing a signal-to-noise-and-interference ratio (SINR) requirement for a transmission in a scheduling interval. The node estimates a frequency resource utilization in the scheduling interval and compares the estimated utilization with a first threshold. When the estimated utilization is equal to or below the first threshold, the node increases the frequency resource utilization for the transmission, and adjusts a link adaptation for the transmission based on the increased frequency resource utilization. Optionally, the node may decrease the transmit power for the scheduling interval based on the adjusted link adaptation.

Abstract: In a wireless communication system, a base station adaptively schedule CQI reports form mobile stations. By adaptively prioritizing the CQI report from the mobile station against the uplink traffic and control data, the CQI reporting rate avoids unnecessary overhead in the uplink while maintaining good performance. The CQI reports are requested in response to a calculated weighting factor which is based on channel coherence time that can be estimated by the base station. The adaptivity in the CQI reporting allows achieving an optimal tradeoff between uplink traffic data and downlink control feedback signaling.

Abstract: In a wireless communication system, a base station adaptively schedule CQI reports form mobile stations. By adaptively prioritizing the CQI report from the mobile station against the uplink traffic and control data, the CQI reporting rate avoids unnecessary overhead in the uplink while maintaining good performance. The CQI reports are requested in response to a calculated weighting factor which is based on channel coherence time that can be estimated by the base station. The adaptivity in the CQI reporting allows achieving an optimal tradeoff between uplink traffic data and downlink control feedback signaling.