Base station

摘要

A use signal determining section determines the use of a first known signal for array transmission control, when a downlink priority is higher than a threshold value. The use signal determining section determines the use of a second known signal for the array transmission control, when the downlink priority is lower than the threshold value. When the first known signal is used for the array transmission control for a communication terminal performing downlink communication therewith, a scheduling executing section determines to perform uplink communication with the communication terminal. When the second known signal is used for the array transmission control for a communication terminal performing downlink communication therewith, the scheduling executing section determines whether or not to perform uplink communication with the communication terminal by using an uplink priority for the communication terminal.

主权项

1. A base station for communicating with communication terminals, comprising:
a communication section for communicating with a plurality of communication terminals by using a plurality of antennas, the communication section controlling a transmission directivity of the plurality of antennas, based on known signals from the plurality of communication terminals when performing downlink communications with the plurality of communication terminals, a scheduling executing section for determining, from the plurality of communication terminals, any communication terminals performing uplink communication of data and any communication terminals performing downlink communication of data in a scheduling target time period including an uplink communication time period and a downlink communication time period, and for allocating an uplink radio resource for use in communication with each communication terminal performing uplink communication of data to each communication terminal performing uplink communication of data and allocating a downlink radio resource for use in communication with each communication terminal performing downlink communication of data to each communication terminal performing downlink communication of data, said known signal including first and second known signals, said first known signal being transmitted using part of a data uplink radio resource allocated to a respective communication terminal, performing uplink communication of data, as the uplink radio resource which the communication terminal performing uplink communication of data uses for data transmission, said second known signal being transmitted using an uplink radio resource usable for the transmission of said second known signal and determined separately from said data uplink radio resource, a transmission mode determining section for determining a transmission frequency band and a transmission cycle of said second known signal for one or more of the plurality of communication terminals, and a use signal determining section for determining the known signal which the communication section uses for the control of the transmission directivity of the plurality of antennas in said scheduling target time period from among said first and second known signals, wherein, upon receipt of notification about the transmission frequency band and the transmission cycle of said second known signal from said base station, each of the plurality of communication terminals is configured to transmit response data to the notification to said base station, and thereafter transmit said second known signal, based on the transmission frequency band and the transmission cycle, wherein said scheduling executing section determines an uplink priority which is a priority of uplink communication for each communication terminal performing uplink communication of data, and determines one or more of the communication terminals performing uplink communication of data in said scheduling target time period based on the uplink priority, wherein said scheduling executing section determines a downlink priority which is the priority of downlink communication for each communication terminal performing downlink communication of data so that the downlink priority increases with an increase in said uplink priority for that communication terminal, and determines one or more of the communication terminals performing downlink communication of data in said scheduling target time period based on the downlink priority, wherein, for each communication terminal performing downlink communication of data, when said downlink priority for the communication terminal is higher than a threshold value, said use signal determining section determines said known signal which the communication section uses for the control of the transmission directivity of the plurality of antennas during the downlink communication with the communication terminal in said scheduling target time period as said first known signal, wherein, for each communication terminal performing downlink communication of data, when said downlink priority for the communication terminal is lower than said threshold value, said use signal determining section determines said known signal which the communication section uses for the control of the transmission directivity of the plurality of antennas during the downlink communication with the communication terminal in said scheduling target time period as said second known signal, wherein, for each communication terminal performing downlink communication of data, when said first known signal is determined to be used for the control of the transmission directivity of said plurality of antennas for the communication terminal determined to perform downlink communication in said scheduling target time period, said scheduling executing section determines to perform uplink communication with the communication terminal in said scheduling target time period without using said uplink priority for the communication terminal, and wherein, for each communication terminal performing downlink communication of data, when said second known signal is determined to be used for the control of the transmission directivity of said plurality of antennas for the communication terminal determined to perform downlink communication in said scheduling target time period, said scheduling executing section determines whether or not to perform uplink communication with the communication terminal in said scheduling target time period by using said uplink priority for the communication terminal.