Method and apparatus of forward link and reverse link power control in a cellular wireless communication system

A cellular wireless communication system wherein a forward link power control is performed by a closed loop power control, the cellular wireless communication system comprising a base transceiver station for tracking a mobile station with reference to a tracking threshold value, the base transceiver station including:

• a decoder for decoding a forward link power control bit from a reverse power control sub-channel embedded on a reverse pilot channel in one power control group;
• a threshold setter for setting a forward link power control bit validation threshold for determining whether the decoded forward link power control bit is valid, the forward link power control bit validation threshold being independent of the tracking threshold;
• a detector for detecting a signal level of the signal produced by the fingers of the finger processor in one power control group in relation to the forward link power control bit;
• and
• a comparator for comparing the value of the detected signal level to the set forward link power control bit validation threshold, so as to determine whether the decoded forward link power control bit in relation to one power control group is valid.

A method for controlling transmission power in a cellular wireless communication system including a plurality of base transceiver stations tracking a mobile station, the method, performed by the mobile station comprising:

• decoding a reverse link power control bit from a forward pilot channel with respect to each of the plurality of base transceiver stations;
• estimating an energy level of communication between the mobile station and each of the plurality of base transceiver stations;
• determining whether each decoded reverse link power control bit is valid in response to the corresponding energy estimation;
• and
• selecting the decoded reverse link power control bit in response to the determination of validity of the reverse link power control bit, the decoded reverse link power control bit determined as valid and selected being provided for the reverse link power control;
• wherein the plurality of base transceiver stations includes first and second base transceiver stations:
• the decoding step includes
• decoding a reverse link power control bit from a forward power control sub-channel embedded in the forward fundamental channel with respect to the first base transceiver station, thereby obtaining a first decoded reverse link power control bit;
• and
• decoding a reverse link power control bit from a forward power control sub-channel embedded in the forward fundamental channel with respect to the second base transceiver station, thereby obtaining a second decoded reverse link power control bit,
• the estimating step includes
• estimating an energy level of communication between the mobile station and the first base transceiver station, thereby obtaining a first energy estimation;
• and
• estimating an energy level of communication between the mobile station and the second base transceiver station, thereby obtaining a second energy estimation,
• the determining step includes
• determining whether the first decoded reverse fink power control bit is valid, in response to the first energy estimation;
• and
• determining whether the second decoded reverse link power control bit is valid, in response to the second energy estimation, and
• the selecting step includes
• selecting the first decoded reverse link power control bit or the second decoded reverse link power control bit in response to the determinations of validity of the first and second reverse link power control bits.

An apparatus for controlling transmission power in a cellular wireless communication system including a plurality of base transceiver stations which track a mobile station, the apparatus comprising:

• a decoder for decoding a reverse link power control bit from a power control sub-channel embedded on a forward pilot channel with respect to each of the plurality of base transceiver stations;
• an estimator for estimating an energy level of communication between the mobile station and each of the plurality of base transceiver stations;
• a determinator for determining whether the decoded reverse link power control bit is valid in response to the energy estimation;
• and
• a selector for selecting the decoded reverse link power control bit in response to the determination of validity of the reverse link power control bit, the decoded reverse link power control bit determined as valid and selected being provided for the reverse link power control;
• wherein the plurality of base transceiver stations include first and second base transceiver stations,
• the decoder including:
• a first decoder for decoding a reverse link power control bit from a power control sub-channel embedded on a forward pilot channel with respect to the first base transceiver station, thereby obtaining a first decoded reverse link power control bit;
• and
• a second decoder for decoding a reverse link power control bit from a power control sub-channel embedded on a forward pilot channel with respect to the second base transceiver station, thereby obtaining a second decoded reverse link power control bit,
• the estimator including:
• a first estimator for estimating an energy level of communication between the mobile station and the first base transceiver station, thereby obtaining a first energy estimation;
• and
• a second estimator for estimating an energy level of communication between the mobile station and the second base transceiver station, thereby obtaining a second energy estimation,
• the determinator including:
• a first determinator for determining whether the first decoded reverse link power control bit is valid, in response to the first energy estimation;
• and
• a second determinator for determining whether the second decoded reverse link power control bit is valid, in response to the second energy estimation,
• the selector including:
• a selector for selecting the first decoded reverse link power control bit or the second decoded reverse link power control bit in response to the determinations of validity of the first and second reverse link power control bits.

A method for controlling transmission power in a cellular wireless communication system including at least first and second base transceiver stations and at least one mobile station, each base transceiver station including a finger processor formed by a RAKE receiver, the finger processor having fingers for producing a signal in response to a reverse data traffic from the mobile station, each base transceiver stations tracking the mobile station with reference to a tracking threshold value determined by communication conditions, each base transceiver station and the mobile station being operably connected by a closed loop power control, the method comprising, performed by each of the base transceiver stations:

• decoding a forward link power control bit from a reverse power control sub-channel embedded on a reverse pilot channel;
• setting a forward link power control bit validation threshold for determining whether the decoded forward link power control bit is valid, the forward link power control bit validation threshold being independent of the tracking threshold;
• detecting a signal level of the signal produced by the fingers of the finger processor in one power control group in relation to the forward link power control bit;
• and
• comparing the value of the detected signal level to the set forward link power control bit validation threshold, so as to determine whether the decoded forward link power control bit in relation to one power control group is valid, the decoded forward link power control bit determined as valid being provided for the forward link power control, the method further comprising, performed by the mobile station:
• decoding a reverse link power control bit from a forward pilot channel with respect to the first base transceiver station, thereby obtaining a first decoded reverse link power control bit;
• decoding a reverse link power control bit from a forward pilot channel with respect to the second base transceiver station, thereby obtaining a second decoded reverse link power control bit;
• estimating an energy level of communication between the mobile station and the first base transceiver station, thereby obtaining a first energy estimation;
• estimating an energy level of communication between the mobile station and the second base transceiver station, thereby obtaining a second energy estimation;
• determining whether the first decoded reverse link power control bit is valid, in response to the first energy estimation;
• determining whether the second decoded reverse link power control bit is valid, in response to the second energy estimation;
• and
• selecting the first decoded reverse link power control bit or the second decoded reverse link power control bit in response to the determinations of validity of the first and second reverse link power control bits, the decoded reverse link power control bit determined as valid and selected being provided for the reverse link power control.