DISTRIBUTED ANTENNA SYSTEM, COMMUNICATION CONTROL METHOD, AND BASE STATION DEVICE,申请号JP20110035578-传众专利搜索

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发明名称	DISTRIBUTED ANTENNA SYSTEM, COMMUNICATION CONTROL METHOD, AND BASE STATION DEVICE
摘要	<P>PROBLEM TO BE SOLVED: To achieve reducing of overhead of a reference signal such as a pilot signal and increasing of selection width of antenna candidates exhibiting an effect as MIMO communication on a base station side in a distributed antenna system, thereby improving throughput of the MIMO communication. <P>SOLUTION: In a distributed antenna system, a sounding signal is transmitted from a terminal at maximum transmission power or transmission power of an antenna selecting threshold or more at a certain time interval. This increases the number of receiving antenna candidates on a base station side in the distributed antenna system so that a combination of antennas with good orthogonality is selected by searching a situation of a radio propagation channel between a terminal and a base station. When a terminal transmits a sounding signal, interference due to packet collision of the sounding signal between terminals is avoided by reserving transmission timing of the sounding signal in advance or performing carrier sensing on whether or not a signal is transmitted from surrounding terminals. <P>COPYRIGHT: (C)2012,JPO&INPIT
申请公布号	JP2012175412(A)	申请公布日期	2012.09.10
申请号	JP20110035578	申请日期	2011.02.22
申请人	HITACHI LTD	发明人	HASHIMOTO KOICHI;TAMAKI TAKESHI
分类号	H04W16/28;H04B7/04;H04J99/00;H04W28/18	主分类号	H04W16/28
代理机构		代理人
主权项
地址

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