DISTRIBUTED ANTENNA SYSTEM BASE STATION AND RADIO RESOURCE CONTROL METHOD
First Claim
1. A distributed antenna system comprising:
- a base station that transmits and receives data by using a plurality of antennas disposed in the distributed antenna system, a plurality of clusters including one or more of some of the antennas being formed in accordance with the position of a mobile terminal, at least two clusters sharing at least one antenna,wherein the base station performs an operation comprising;
when a new communication is initiated or a mobile terminal is moved, provisionally determining a first antenna and a second antenna for a first mobile terminal and a first cluster containing the first antenna and the second antenna;
formulating an overload judgment to determine whether the provisionally determined first and second antennas are overloaded;
when the first antenna is judged to be overloaded, selecting a third antenna and a fourth antenna as changed communication antennas for a second mobile terminal communicating with the first and third antennas and a second cluster containing the third and fourth antennas as a change destination cluster for load reduction purposes;
selecting the provisionally determined first and second antennas and the first cluster as the antennas and cluster for the first mobile terminal;
conveying at least one of identification information about the selected first and second antennas and identification information about the first cluster to the first mobile terminal and conducting subsequent communication by using the antennas whose identification information has been conveyed; and
conveying at least one of identification information about the third and fourth antennas, which are selected as change destinations, and identification information about the second cluster to the second mobile terminal and conducting subsequent communication by using the antennas whose identification information has been conveyed.
1 Assignment
0 Petitions
Accused Products
Abstract
Disclosed is a distributed antenna system that selects an antenna in accordance with the position of a mobile terminal and reduces the variation in the total number of mobile terminals using each antenna while maintaining adequate communication quality. In the distributed antenna system in which a large number of antennas are distributively disposed, an antenna group including antennas having good communication quality is selected in accordance with the position of a mobile terminal. Further, in accordance with the communication quality and load status of a current antenna group and with the communication quality and load status of a post-change antenna group, which is obtained by changing some antennas in the current antenna group, the post-change antenna group is formed by changing some antennas in the current antenna group with which a mobile terminal using a heavily loaded antenna communicates.
91 Citations
14 Claims
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1. A distributed antenna system comprising:
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a base station that transmits and receives data by using a plurality of antennas disposed in the distributed antenna system, a plurality of clusters including one or more of some of the antennas being formed in accordance with the position of a mobile terminal, at least two clusters sharing at least one antenna, wherein the base station performs an operation comprising; when a new communication is initiated or a mobile terminal is moved, provisionally determining a first antenna and a second antenna for a first mobile terminal and a first cluster containing the first antenna and the second antenna; formulating an overload judgment to determine whether the provisionally determined first and second antennas are overloaded; when the first antenna is judged to be overloaded, selecting a third antenna and a fourth antenna as changed communication antennas for a second mobile terminal communicating with the first and third antennas and a second cluster containing the third and fourth antennas as a change destination cluster for load reduction purposes; selecting the provisionally determined first and second antennas and the first cluster as the antennas and cluster for the first mobile terminal; conveying at least one of identification information about the selected first and second antennas and identification information about the first cluster to the first mobile terminal and conducting subsequent communication by using the antennas whose identification information has been conveyed; and conveying at least one of identification information about the third and fourth antennas, which are selected as change destinations, and identification information about the second cluster to the second mobile terminal and conducting subsequent communication by using the antennas whose identification information has been conveyed. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11)
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12. A base station comprising:
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a plurality of antennas that form clusters in accordance with the position of a mobile terminal, are shared by at least two of the clusters, and communicate data with the mobile terminal; wherein an operation performed by the base station includes provisionally determining a first antenna and a second antenna for a first mobile terminal and a first cluster containing the first antenna and the second antenna when a new communication is initiated or a mobile terminal is moved, formulating an overload judgment to determine whether the provisionally determined first and second antennas are overloaded, when the first antenna is judged to be overloaded, selecting a third antenna and a fourth antenna as changed communication antennas for a second mobile terminal communicating with the first and third antennas and a second cluster containing the third and fourth antennas as a change destination cluster for load reduction purposes, selecting the provisionally determined first and second antennas and the first cluster as the antennas and cluster for the first mobile terminal, conveying at least one of identification information about the selected first and second antennas and identification information about the first cluster to the first mobile terminal and conducting subsequent communication by using the antennas whose identification information has been conveyed, and conveying at least one of identification information about the third and fourth antennas, which are selected as change destinations, and identification information about the second cluster to the second mobile terminal and conducting subsequent communication by using the antennas whose identification information has been conveyed. - View Dependent Claims (13)
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14. A radio resource control method for a distributed antenna system that includes a base station, the base station transmitting and receiving data by using a plurality of antennas disposed in the distributed antenna system in which a plurality of clusters including one or more of some of the antennas are formed in accordance with the position of a mobile terminal, at least two clusters sharing at least one antenna, the radio resource control method comprising the steps of:
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when a new communication is initiated or a mobile terminal is moved, causing the base station to provisionally determine a first antenna and a second antenna for a first mobile terminal and a first cluster containing the first antenna and the second antenna; causing the base station to formulate an overload judgment to determine whether the provisionally determined first and second antennas are overloaded; when the first antenna is judged to be overloaded, causing the base station to select a third antenna and a fourth antenna as changed communication antennas for a second mobile terminal communicating with the first and third antennas and a second cluster containing the third and fourth antennas as a change destination cluster for load reduction purposes; causing the base station to select the provisionally determined first and second antennas and the first cluster as the antennas and cluster for the first mobile terminal; causing the base station to convey at least one of identification information about the selected first and second antennas and identification information about the first cluster to the first mobile terminal and conduct subsequent communication by using the antennas whose identification information has been conveyed; and causing the base station to convey at least one of identification information about the third and fourth antennas, which are selected as change destinations, and identification information about the second cluster to the second mobile terminal and conduct subsequent communication by using the antennas whose identification information has been conveyed.
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Specification