EP0660633A2
Expired / Lapsed
EP
⏱️ 0.0 years remaining
Mobile communication system for radio zones each divided into sectors
Assignee: NEC Corp
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Filing: 1994-12-14
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Granted: —
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Expires: 2014-12-14
Abstract
Abstract Each of base stations 2 is positioned in a radio zone composed of three sectors and has a base station controller 3. The base station controller 3 measures upstream interference signal levels in all directions with receiving sector antennas 11, 13, 15 or omnidirectional antenna 17, determines candidate channels for assignment to the mobile stations 18, indicates the candidate channels to the mobile stations 18, instructs each of the mobile stations 18 to measure and report downstream interference signal levels to the base station controller 3, and then determines channels to be assigned. When determining candidate channels for assignment to the mobile stations 18, the base station controller 3 rearranges candidate channels into an order of an ascending order of upstream interference signal levels based on the measured upstream interference signal levels, and assigns candidate channels to groups of mobile stations 18.
Inventors
- 👤 Tetsuro C/O Nec Corporation Ueda
Bibliographic Details
Application Number
—
Jurisdiction
EP
Data Source
google_patents
Last Synchronized
2026-10-31 03:20
CPC Classifications
H; H04; H04W; H04W72/00; H04W72/50; H04W72/54; H04W72/541; H04W16/00; H04W16/24
Claims Analysis
Total Claims: 7
Claim 1
Independent Claim
238 words
A mobile communication system comprising: a plurality of base stations positioned respectively in a plurality of radio zones each divided into a plurality of sectors; a plurality of sector antennas serving respectively the sectors of each of the radio zones; and a plurality of mobile stations that can be connected to the base stations through radio transmission paths, the arrangement being such that the mobile communication system is capable of transmitting and receiving a call by way of dynamic channel assignment based on simultaneous use of the same frequency or time slot under conditions acceptably free of mutual interference between base stations; each of said base stations comprising: upstream interference signal level measuring means for measuring upstream interference signal levels in communication channels of the mobile stations from all sectors effectively continuously; means for determining candidate channels for assignment to the mobile stations based on the upstream interference signal levels measured by said upstream interference signal level measuring means; and means for indicating channel numbers of the candidate channels for assignment to all the mobile stations in the radio zone in which the base station is positioned; each of said mobile stations comprising: means for receiving the channel numbers of the candidate channels and measuring downstream interference signal levels in the candidate channels; and means for simultaneously reporting the downstream interference signal levels in the candidate channels to the base station when a call is transmitted and received.
Claim 2
Dependent Claim
238 words
A mobile communication system comprising: a plurality of base stations positioned respectively in a plurality of radio zones each divided into a plurality of sectors; a plurality of sector antennas serving respectively the sectors of each of the radio zones; and a plurality of mobile stations that can be connected to the base stations through radio transmission paths, the arrangement being such that the mobile communication system is capable of transmitting and receiving a call by way of dynamic channel assignment based on simultaneous use of the same frequency or time slot under conditions acceptably free of mutual interference between base stations; each of said base stations comprising: upstream interference signal level measuring means for measuring upstream interference signal levels in communication channels of the mobile stations from all sectors effectively continuously; means for determining candidate channels for assignment to the mobile stations based on the upstream interference signal levels measured by said upstream interference signal level measuring means; and means for indicating channel numbers of the candidate channels for assignment to all the mobile stations in the radio zone in which the base station is positioned; each of said mobile stations comprising: means for receiving the channel numbers of the candidate channels and measuring downstream interference signal levels in the candidate channels; and means for simultaneously reporting the downstream interference signal levels in the candidate channels to the base station when a call is transmitted and received.
Claim 3
Dependent Claim
36 words
A mobile communication system according to claim 1, wherein said upstream interference signal level measuring means comprises means for measuring upstream interference signal levels with all the sector antennas associated with each of the base stations.
Claim 4
Dependent Claim
53 words
A mobile communication system according to claim 1, further including an omnidirectional antenna and an omnidirectional receiver connected to the omnidirectional antenna associated with each of the base stations, said upstream interference signal level measuring means measures upstream interference signal levels from the mobile stations using said omnidirectional antenna and the omnidirectional receiver.
Claim 5
Dependent Claim
60 words
A mobile communication system according to Claim 1, wherein said means for determining candidate channels for assignment to the mobile stations comprises means for rearranging the candidate channels into an ascending order of upstream interference signal levels based on the measured upstream interference signal levels in the communication channels, and assigning the candidate channels to groups of the mobile stations.
Claim 6
Dependent Claim
164 words
In a mobile radio communication system in which mobile stations communicate with one of a plurality of base stations by way of dynamic communication channel assignment based on simultaneous use of the same frequency under conditions free of unacceptable interference between base stations, a method of channel assignment comprising: - measuring at a base station upstream interference signal levels in channels usable by said station; - determining candidate channels for assignment to mobile stations based on said upstream interference signal levels; - indicating said candidate channels to mobile stations served by said basic station; - measuring at each mobile station the downstream interference signal levels in said indicated candidate channels - when a call is to be made or received by said mobile station, reporting simultaneously from that station the downstream interference signal levels in at least some of the candidate channels to the base station; and - assigning a communication channel forsaid call based on the upstream and reported downstream interference signal levels.
Claim 7
Dependent Claim
164 words
In a mobile radio communication system in which mobile stations communicate with one of a plurality of base stations by way of dynamic communication channel assignment based on simultaneous use of the same frequency under conditions free of unacceptable interference between base stations, a method of channel assignment comprising: - measuring at a base station upstream interference signal levels in channels usable by said station; - determining candidate channels for assignment to mobile stations based on said upstream interference signal levels; - indicating said candidate channels to mobile stations served by said basic station; - measuring at each mobile station the downstream interference signal levels in said indicated candidate channels - when a call is to be made or received by said mobile station, reporting simultaneously from that station the downstream interference signal levels in at least some of the candidate channels to the base station; and - assigning a communication channel forsaid call based on the upstream and reported downstream interference signal levels.
References Cited (Backward Citations)
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