Mobile communication system and base station control apparatus
First Claim
1. A wireless communication system comprising:
- one or plural base stations each of which has one or plural sectors and transmits neighbor sector information including, for each sector, a sector identifier of another sector adjacent to the sector and/or information to identify a radio wave from the another sector, to a wireless terminal for each sector; and
a base station control part which includes a connection history table storing, for each terminal identifier of the wireless terminal and correspondingly to a time, a sector identifier of a sector with which the wireless terminal communicates, and is for changing the neighbor sector information transmitted from the base station, whereinthe base station transmits the terminal identifier acquired from the wireless terminal and the sector identifier of the sector communicating with the wireless terminal to the base station control part,the base station control part receives the terminal identifier and the sector identifier, and stores the sector identifier into the connection history table correspondingly to the terminal identifier and a reception time,the base station control part refers to the connection history table, judges that in a case where plural different sector identifiers are stored correspondingly to each terminal identifier in a previously determined time period from an arbitrary time, a first sector and a second sector among the plural different sector identifiers are neighbor sector candidates, and counts the number of times they are judged to be the neighbor sector candidates correspondingly to a first sector identifier of the first sector and a second sector identifier of the second sector, andthe base station control part transmits, with respect to the first and the second sector identifiers in which the counted number of times is a previously determined threshold or more, a change request, which includes the second sector identifier and/or information to identify a radio wave from the second sector and is for changing the neighbor sector information from the base station, to the base station corresponding to the first identifier.
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Accused Products
Abstract
A neighbor sector is automatically set to effectively perform soft handover. A base station corresponding to a first sector to communicate with a wireless terminal and a base station corresponding to a second sector to start communication with the wireless terminal due to movement of the wireless terminal or the like transmit a terminal identifier acquired from the wireless terminal, a time and a sector identifier to a base station control part (control part in the following). The control part successively stores the received sector identifier into a table correspondingly to the terminal identifier and the time received from the base station. Besides, the control part refers to the table, judges whether different sector identifiers are stored in a previously determined time range, regards a pair of the two different sector identifiers as neighbor sector candidates and counts the number of times they are regarded as the neighbor sector candidates. With respect to the neighbor sector candidates in which the counted number of times is a threshold or more, the control part transmits, to the base station corresponding to one sector of the neighbor sector candidates, a change request including the neighbor sector information concerning the other sector.
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Citations
11 Claims
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1. A wireless communication system comprising:
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one or plural base stations each of which has one or plural sectors and transmits neighbor sector information including, for each sector, a sector identifier of another sector adjacent to the sector and/or information to identify a radio wave from the another sector, to a wireless terminal for each sector; and a base station control part which includes a connection history table storing, for each terminal identifier of the wireless terminal and correspondingly to a time, a sector identifier of a sector with which the wireless terminal communicates, and is for changing the neighbor sector information transmitted from the base station, wherein the base station transmits the terminal identifier acquired from the wireless terminal and the sector identifier of the sector communicating with the wireless terminal to the base station control part, the base station control part receives the terminal identifier and the sector identifier, and stores the sector identifier into the connection history table correspondingly to the terminal identifier and a reception time, the base station control part refers to the connection history table, judges that in a case where plural different sector identifiers are stored correspondingly to each terminal identifier in a previously determined time period from an arbitrary time, a first sector and a second sector among the plural different sector identifiers are neighbor sector candidates, and counts the number of times they are judged to be the neighbor sector candidates correspondingly to a first sector identifier of the first sector and a second sector identifier of the second sector, and the base station control part transmits, with respect to the first and the second sector identifiers in which the counted number of times is a previously determined threshold or more, a change request, which includes the second sector identifier and/or information to identify a radio wave from the second sector and is for changing the neighbor sector information from the base station, to the base station corresponding to the first identifier. - View Dependent Claims (2, 3, 4)
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5. A wireless communication system comprising:
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one or plural base stations each of which has one or plural sectors and transmits neighbor sector information including, for each sector, a sector identifier of another sector adjacent to the sector and/or information to identify a radio wave from the another sector; and a base station control part to change the neighbor sector information transmitted from the base station, wherein the base station acquires, from a wireless terminal, one or plurality of captured radio wave information indicating radio waves captured from one or plural sectors by the wireless terminal and transmits the captured radio wave information to the base station control part, the base station control part receives the captured radio wave information from the base station, judges whether plurality of captured radio wave information are received, judges that a first sector and a second sector are neighbor sector candidates among plural sector identifiers each of which corresponds to the plurality of captured radio wave information, and counts the number of times they are judged to be the neighbor sector candidates correspondingly to a first sector identifier of the first sector and a second sector identifier of the second sector, and the base station control part transmits, with respect to the first and the second sector identifiers in which the counted number of times is a previously determined threshold or more, a change request, which includes the second sector identifier and/or information to identify a radio wave from the second sector and is for changing the neighbor sector information from the base station, to the base station corresponding to the first identifier. - View Dependent Claims (6, 7, 8, 9)
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10. A wireless base station control apparatus comprising:
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an interface to transmit/receive information to/from a base station having one or plural sectors; a connection history table in which a sector identifier of a sector with which a wireless terminal communicates is stored for each terminal identifier of the wireless terminal and correspondingly to a time; and a processing part to change neighbor sector information which is transmitted from the base station having one or plural sectors to the wireless terminal and includes, for each sector, a sector identifier of another sector adjacent to the sector and/or information to identify a radio wave from the another sector, wherein the processing part receives, from the base station, a terminal identifier from the wireless terminal and a sector identifier of a sector communicating with the wireless terminal, the processing part stores the sector identifier into the connection history table correspondingly to the terminal identifier and a reception time, the processing part refers to the connection history table, judges that in a case where plural different sector identifiers are stored correspondingly to each terminal identifier in a previously determined time period from an arbitrary time, a first sector and a second sector among the plural different sector identifiers are neighbor sector candidates, and counts the number of times they are judged to be the neighbor sector candidates correspondingly to a first sector identifier of the first sector and a second sector identifier of the second sector, and the processing part transmits, with respect to the first and the second sector identifiers in which the counted number of times is a previously determined threshold or more, a change request, which includes the second sector identifier and/or information to identify a radio wave from the second sector and is for changing the neighbor sector information from the base station, to the base station corresponding to the first identifier.
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11. A wireless base station control apparatus comprising:
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an interface to transmit/receive information to/from a base station having one or plural sectors; and a processing part to change neighbor sector information which is transmitted from the base station to a wireless terminal and includes, for each sector, a sector identifier of another sector adjacent to the sector and/or information to identify a radio wave from the another sector, wherein the processing part receives, from the base station, one or plurality of captured radio wave information indicating radio waves captured by the wireless terminal from one or plural sectors, judges whether plurality of captured radio wave information are received, judges that a first sector and a second sector among plural sector identifiers corresponding to the plurality of captured radio wave information are neighbor sector candidates, and counts the number of times they are judged to be the neighbor sector candidates correspondingly to a first sector identifier of the first sector and a second sector identifier of the second sector, and the processing part transmits, with respect to the first and the second sector identifiers in which the counted number of times is a previously determined threshold or more, a change request, which includes the second sector identifier and/or information to identify a radio wave from the second sector and is for changing the neighbor sector information from the base station, to the base station corresponding to the first sector identifier.
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Specification