EP0531090A2
Expired / Lapsed
EP
⏱️ 0.0 years remaining
Cells re-use partition in a mobile communication system
Assignee: NTT Docomo Inc
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Filing: 1992-09-01
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Granted: —
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Expires: 2012-09-01
Abstract
Abstract A re-use partition of cells in a mobile communication system has an outer cell (30) and an inner cell (20) which is provided in said outer cell (30). Interval of cells using the same channel or the same frequency in inner cells is shorter than interval in outer cells, as nature of re-use partition. Communication between a base station and a mobile station is carried out by using a channel of higher received level of an outer cell channel or an inner cell channel. A base station has a first beam tilt antenna having tilt angle ( theta out) for an outer cell (30), and a second beam tilt antenna having tilt angle ( theta in) so that theta in is larger than theta out. A speech channel and a control channel are provided for each of said first antenna and said second antenna. <IMAGE>
Inventors
- 👤 Teruya Fujii
- 👤 Masayuki Sakamoto
Bibliographic Details
Application Number
—
Jurisdiction
EP
Data Source
google_patents
Last Synchronized
2026-10-26 11:20
CPC Classifications
H; H04; H04W; H04W16/00; H04W16/24; H04W16/30; H04W16/02; H04W16/12; H04W16/28; H04W16/32
Claims Analysis
Total Claims: 14
Claim 1
Independent Claim
180 words
A mobile communication system having a plurality of radio cells for a service area, each cell being assigned a respective channel, and the same channel being used in a plurality of cells which are spaced apart from each other by more than a predetermined spacing comprising a first small cell provided in a radio cell by a first antenna provided in a base station, and a second small cell, which is smaller than said first small cell, provided in said first small cell by a second antenna provided in said base station, a cell interval such that the same channel used in the second cell has a cell interval smaller than a cell interval of that same channel used in the first small cell, wherein each small cell has a respective channel; a control channel covering each small cell, and wherein communication between a mobile station and a base station is effected through a channel having a higher received level in a first channel and a second channel than at least one of a communication channel and a control channel.
Claim 2
Dependent Claim
29 words
A mobile communication system according to claim 1, wherein each of said first antenna and said second antenna is a beam tilt antenna having a respective beam tilt angle.
Claim 3
Dependent Claim
26 words
A mobile communication system according to claim 1 or claim 2, wherein effective input power to an antenna depends upon each antenna for each small cell.
Claim 4
Dependent Claim
22 words
A mobile communication system according to any preceding claim, wherein said first small cell and said second small cell are in omni-structure.
Claim 5
Dependent Claim
26 words
A mobile communication system according to any of claims 1 to 3, wherein said first small cell and said second small cell are in sector structure.
Claim 6
Dependent Claim
27 words
A mobile communication system according to any of claims 1-3, wherein said first small cell is in sector structure, and said second small cell is in omni-structure.
Claim 7
Dependent Claim
34 words
A mobile communication system according to any preceding claim, wherein comparison of received levels of two channels relating to each small cell and selection of small cells are carried out in a mobile station.
Claim 8
Dependent Claim
28 words
A mobile communication system according to claim 7, wherein selection of small cells is effected based upon received level of a control channel provided for each small cell.
Claim 9
Dependent Claim
37 words
A mobile communication system according to any of claims 1 to 6, wherein comparison of received levels of two channels relating to each small cell and selection of small cells are carried out in a base station.
Claim 10
Dependent Claim
34 words
A mobile communication system according to claim 9, wherein selection of small cells is effected in a base station based upon received level of a control channel which is common to each small cell.
Claim 11
Dependent Claim
26 words
A mobile communication system according to claim 9, wherein selection of small cells is effected in a base station upon received level of a speech channel.
Claim 12
Dependent Claim
48 words
A mobile communication system according to any preceding claim, wherein a third antenna provides a third small cell within said second small cell, a third speech channel and a third control channel are provided, and communication is carried out by using the highest receive level of three channels.
Claim 13
Dependent Claim
53 words
A mobile communication system according to any preceding claim, wherein when all the channels in a second small cell are full and some of the channels in a first small cell are available, a channel in a first small cell is assigned to a mobile station which stays in a second small cell.
Claim 14
Dependent Claim
52 words
A mobile communication system according to claim 13, wherein a mobile station which stays in a second small cell, and is assigned a speech channel of a first small cell, hands over a speech channel to that of a second small cell, when a channel in a second small cell becomes available.
References Cited (Backward Citations)
No citation records indexed.
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