WIRELESS COMMUNICATION SYSTEM, TRANSMISSION POWER CONTROL METHOD, AND NETWORK CONTROL APPARATUS

摘要

The objective of the invention is to improve the communication performance of a secondary system within such a range that does not affect a primary system. A wireless communication system comprises: a primary system that can use a given frequency on a priority basis; secondary wireless communication systems each of which is operated with the same frequency; and a network control apparatus that controls the secondary wireless communication systems. The network control apparatus comprises: a primary system information acquiring unit that acquires information of the primary system; a secondary system information acquiring unit that acquires communication quality information of the secondary wireless communication systems; and an optimum computing unit that calculates, on the basis of the primary and secondary system information acquiring units, the transmission powers of a plurality of base stations of the secondary wireless communication systems.

主权项

1. A wireless communication system comprising:
a primary system that includes a wireless station and is able to primarily use a certain frequency; one or a plurality of wireless communication systems, having a base station (BS), which are a secondary system that secondarily use the same frequency as that of the primary system; and a network control apparatus that controls the one or the plurality of wireless communication systems, wherein the network control apparatus includes:
a secondary system communication quality information set unit that stores a communication quality information set including identification information regarding the BS of the secondary system, identification information regarding a wireless terminal, used frequency channel information, and received power, anda control unit, wherein, when the network control apparatus receives a frequency channel sharing trigger indicating that a frequency channel operated so that a frequency does not overlap with that of an adjacent cell is insufficient from each BS of the secondary system, the control unit generates a received power classification table which classifies signal power and interference power between each wireless terminal, and the wireless station of the primary system and each BS of the secondary system, with reference to the secondary system communication quality information set unit and based on the identification information regarding the BS, the identification information regarding the wireless terminal, and the received power, the control unit calculates a transmission power amplification rate or transmission power of each secondary system using the received power classification table, and the control unit transmits a transmission power change instruction packet storing the calculated transmission power amplification rate or transmission power to each BS sharing the frequency channel of the one or the plurality of secondary systems.