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Wireless communication system, wireless communication method, cooperation control apparatus, terminal apparatus, and licensed band base station apparatus

  • US 10,477,407 B2
  • Filed: 08/20/2015
  • Issued: 11/12/2019
  • Est. Priority Date: 08/21/2014
  • Status: Active Grant
First Claim
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1. A wireless communication system comprising:

  • a plurality of terminal apparatuses that perform wireless communication using a first frequency band in which wireless communication based on a random access scheme is performed and a second frequency band which is different from the first frequency band;

    a first base station apparatus that performs wireless communication with the terminal apparatuses using the first frequency band;

    a second base station apparatus that performs wireless communication with the terminal apparatuses using the second frequency band; and

    a cooperation control apparatus that selects a terminal apparatus that transmits user data via the first base station apparatus from among the plurality of terminal apparatuses based on one or both of first communication quality in the wireless communication which is performed between the first base station apparatus and the terminal apparatuses and second communication quality in the wireless communication which is performed between the second base station apparatus and the terminal apparatuses and selects which of the first base station apparatus and the selected terminal apparatus acquires access right for transmission of the user data,wherein the cooperation control apparatusdetermines a communication condition in the first frequency band including at least designation of an access right acquiring apparatus from information input from one or both of the first base station apparatus and the second base station apparatus,generates an unlicensed channel (UC) communication initiation signal for notifying one or both of the first base station apparatus and the second base station apparatus of the communication condition, andoutputs the UC communication initiation signal to the first base station apparatus and the second base station apparatus,the first base station apparatuswaits until the user data or a UC transmission request signal is received without performing transmission to the selected terminal apparatus if the selected terminal apparatus is designated as the access right acquiring apparatus, andperforms transmission of the user data to the selected terminal apparatus or transmission of the UC transmission request signal for causing the selected terminal apparatus to perform transmission using the first frequency band to the selected terminal apparatus based on information provided by the UC communication initiation signal if the selected terminal apparatus is not designated as the access right acquiring apparatus,the second base station apparatus collects information on user data waiting for transmission in the selected terminal apparatus and transmits the UC communication initiation signal to the selected terminal apparatus,the selected terminal apparatus, based on the UC communication initiation signal received from the second base station apparatus,transmits the user data or the UC transmission request signal for causing the first base station apparatus to perform transmission to the first base station apparatus if the selected terminal apparatus is designated as the access right acquiring apparatus, andwaits until the user data or the UC transmission request signal is received without performing transmission to the first base station if the selected terminal apparatus is not designated as the access right acquiring apparatus, andthe cooperation control apparatus controls acquisition of the access right in the first frequency band using communication in the second frequency band.

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