Telecommunications – Transmitter and receiver at same station – Radiotelephone equipment detail
Reexamination Certificate
2006-10-10
2006-10-10
Beamer, Temica (Department: 2617)
Telecommunications
Transmitter and receiver at same station
Radiotelephone equipment detail
C455S446000, C455S455000, C455S453000, C370S335000, C370S342000
Reexamination Certificate
active
07120467
ABSTRACT:
A base station is configured to transmit a downlink signal to a mobile station located in a sector managed by the base station. The downlink signal is spread using a scrambling code. The base station has a monitor configured to monitor a change of a reception condition of an uplink common channel of the mobile station in the sector, a DOA estimator configured to estimate a direction of arrival of an uplink signal transmitted from the mobile station, in response to the change, an area border setter configured to separate the sector into a plurality of areas, by setting an area border in the sector in accordance with the estimated direction, a scrambling code assigner configured to assign a different scrambling code to each of the separated areas and a spreader configured to spread the downlink signal using the assigned scrambling code in each of the separated areas.
REFERENCES:
patent: 6275482 (2001-08-01), Jevremovic et al.
patent: 6487416 (2002-11-01), Bundy et al.
patent: 6804214 (2004-10-01), Lundh et al.
patent: 2004/0136342 (2004-07-01), Pedersen et al.
patent: WO 00/51368 (2000-08-01), None
Nakamura Takehiro
Okawa Koichi
Tanaka Shinya
Umesh Anil
Beamer Temica
NTT DoCoMo Inc.
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