Telecommunications – Transmitter and receiver at separate stations – Plural transmitters or receivers
Reexamination Certificate
1999-07-08
2001-09-04
Maung, Nay (Department: 2681)
Telecommunications
Transmitter and receiver at separate stations
Plural transmitters or receivers
C455S069000
Reexamination Certificate
active
06285886
ABSTRACT:
FIELD OF THE INVENTION
This invention relates to wireless communication systems and more particularly to a method for controlling power for a communications system having multiple traffic channels per subscriber.
BACKGROUND
Wireless communication systems may use power control schemes to reduce interference among mobile subscribers or to increase subscriber traffic capacity. Adequate power control is particularly important for proper performance of a subscriber's mobile station in a code-division multiple-access environment. The evolution of wireless communication systems is contemplated in which a single mobile station may operate over multiple channels simultaneously. Therefore, a need exists for a power control scheme which is sufficiently adaptable to handle single-channel or multiple-channel communications per each mobile station in a wireless communications network.
SUMMARY OF THE INVENTION
In accordance with the invention, the power control method may be applied to downlink power control, uplink power control, or both to support different quality of service levels for multiple traffic channels per each subscriber. In the context of downlink power control, a wireless communications system establishes a first communications channel and a second communications channel for contemporaneous operation between a mobile station and a base station. The mobile station recognizes a first quality of service target for the first communications channel and a second quality of service target for the second communications channel. A mobile station measures a first quality of service parameter and a second quality of service parameter. The mobile station transmits control data over the first communications channel, the second communications channel, or a control channel to control downlink transmit power of the base station. The control data includes incremental update data based upon the first quality of service parameter and the first quality of service target for the first communications channel. The control data may contain incremental offset data based upon a second quality of service parameter and a second quality of service target. The incremental offset data is defined with reference to the incremental update data. Advantageously, the incremental offset data may be transmitted efficiently over a single channel between the mobile station and the base station on an as-needed basis to reduce overhead control traffic.
In the context of uplink power control, the base station measures the first quality of service parameter and the second quality of service parameter. The base station transmits control data over the first communications channel, the second communications channel, or a control channel to control uplink transmit power of the mobile station. Accordingly, the power control roles of the base station and the mobile station are interchanged for uplink versus downlink power control. The method for controlling power is well-suited for conserving system resources by reducing, or otherwise minimizing, the volume of control data transmitted between the base station and a multi-channel mobile station.
REFERENCES:
patent: 5485486 (1996-01-01), Gilhousen et al.
patent: 5574979 (1996-11-01), West
patent: 5678187 (1997-10-01), Meidan et al.
patent: 5806003 (1998-09-01), Jolma et al.
Telecommunication Industry Association (TIA) /Electronics Industry Assocuation (EIA), International Standard (IS)-2000.2 Section 2.1.3.1.11.3.
Kamel Raafat Edward
Kuo Wen-Yi
Meyers Martin Howard
Weaver Carl Francis
Wu Xiao Cheng
Lucent Technologies - Inc.
Maung Nay
Vuong Quochien B.
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