| 摘要 |
When a frequency channel is shared between adjacent cells in a wireless communication system of time-division duplex operation utilizing a white space, more efficient communications can be achieved. In a wireless communication system of time-division duplex operation utilizing a white space, which is a temporally and spatially unused frequency, to perform wireless communications and having frames in which downstream and upstream subframes are alternately arranged on the time axis, a network controller calculates a common split position, which is to be used in synchronization between base stations sharing a frequency, from collected information in response to a frequency sharing trigger and synchronizes the determined split position between the base stations, thereby allowing the frequency channel to be shared. |
| 主权项 |
1. A wireless communication system comprising:
one or a plurality of base stations (BSs) that perform a data service in a normal mode in which a channel is not shared between adjacent cells, or in a first sharing mode in which a split position of a downstream subframe and an upstream subframe of each frame in which a frequency channel is shared is used in common, and the downstream subframe and the upstream subframe are alternately disposed on a time axis so that the base stations do not give interference to each other; and a network controller (NC), wherein the NC includes
a channel sharing information table that stores channel sharing information including BS identification information, a use channel, the present split position, a requested split position, and a common split position, in relation to the one or the plurality of BSs under the competence of the NC; anda processing unit that determines a common split position of the frame, wherein the BS transmits a base station information including BS identification information, a use channel, the present split position, and a requested split position, the NC receives the base station information and stores the base station information in the channel sharing information table, when the BS acquires a usable channel, in a case where the BS determines that channel acquisition fails due to a channel shared by an adjacent cell being selected, the BS determines whether or not a wireless terminal belonging to another BS adjacent thereto is located at a position where interference is given to the BS, and in a case where there is no interference from the wireless terminal, the BS transmits a channel sharing start trigger including BS identification information and a use channel to the NC, the NC receives the channel sharing start trigger from the BS, and the processing unit determines a common split position candidate at which first estimated channel use efficiency is the maximum as common split position information and sends the common split position information to the BS, wherein the first estimated channel use efficiency is a value which becomes worse as the common split position candidate gets away from the requested split position from one of the plurality of BSs, and the BS receives the common split position information determined by the NC, adjusts a split position according to the common split position information, and performs a data service by using channel sharing based on a first sharing mode. |
