Power control device and method for controlling a reverse link common channel in a CDMA communication system
First Claim
1. A method for controlling a reverse link common channel in a code division multiple access (CDMA) communication system, comprising the steps of:
- receiving, at a base station, a signal transmitted from a mobile station via a reverse link common channel;
designating, at the base station, a spreading code to be used for the reverse link common channel; and
transmitting to the mobile station a power control command for controlling a transmission power of the reverse link common channel.
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Accused Products
Abstract
A common power control channel transmission device for a base station in a CDMA communication system is provided having a selector for receiving power control commands to be transmitted to multiple subscribers and multiplexing the received power control commands; and a spreading modulator for spreading an output of the selector by multiplying the output of the selector by a spreading sequence. The common power control channel transmission device can be used to control power of a reverse link common channel. For the power control of the reverse link common channel, the base station receives a signal from a mobile station via the reverse link common channel, and transmits to the mobile station a power control command for controlling a transmission power of the reverse link common channel according to a measured strength of the received signal.
142 Citations
37 Claims
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1. A method for controlling a reverse link common channel in a code division multiple access (CDMA) communication system, comprising the steps of:
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receiving, at a base station, a signal transmitted from a mobile station via a reverse link common channel;
designating, at the base station, a spreading code to be used for the reverse link common channel; and
transmitting to the mobile station a power control command for controlling a transmission power of the reverse link common channel. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 28, 29)
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14. A method for controlling a reverse link common channel in a CDMA communication system, comprising the steps of:
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transmitting, at a base station, a permission command to use a spreading code via a forward link common channel, to designate a spreading code to be used for a reverse link common channel to a mobile station;
receiving, at the base station, a signal that the mobile station transmits by spreading a reverse link common channel using the designated spreading code; and
sending, at the base station, to the mobile station a power control command for controlling a transmission power of the reverse link common channel according to a strength of the received signal.
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15. A method for controlling a reverse link common channel of a mobile station in a CDMA communication system, comprising the steps of:
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transmitting, at the mobile station, a signal to a base station via a reverse link common channel;
receiving, at the mobile station, a power control command from the base station after transmission of the signal, and a spreading code to be used for a reverse link common channel designated by the base station; and
controlling, at the mobile station, a transmission power of the reverse link common channel according to the received power control command. - View Dependent Claims (16, 17, 18, 19, 20, 21, 22, 23, 24, 25, 26, 27, 30)
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27. The method as claimed in claim 15, wherein the mobile station determines an initial transmission power of the reverse link common channel based on a formula given by:
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30. The method as claimed in claim 15, wherein a long code is designated from a plurality of previously provided long codes used by other mobile stations, so as to prevent a collision between a signal spread by said designated long code and reverse link common channels for other mobile stations.
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31. A base station device for a CDMA communication system, comprising:
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a common power control channel transmitter for forming a common power control channel for controlling transmission powers of reverse link common channels for multiple subscribers, transmitting power control commands for the corresponding subscribers via the common power control channel, and assigning, at the base station, a spreading code to be used for a reverse link common channel; and
at least one subscriber channel transmitter for transmitting data and control commands to the multiple subscribers via a forward link. - View Dependent Claims (32, 33, 34, 35, 36, 37)
an encoder for encoding data on a subscriber channel into symbol data;
a puncture position controller for generating a pseudo-randomized puncture position control signal; and
a puncturer for receiving in sequence the symbol data output from the encoder and puncturing the symbol data according to the puncture position control signal.
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33. The base station device as claimed in claim 31, wherein the common power control channel transmitter comprises:
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a selector for receiving the power control commands to be transmitted to the multiple subscribers and multiplexing the received power control commands; and
spreading modulator for spreading an output of the selector by multiplying the output of the selector by a spreading sequence, and then transmitting the spread signal.
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34. The base station device as claimed in claim 33, further comprising a slot controller for controlling the selector in such a manner that the power control commands, output from the selector, for the respective subscriber are arranged, in the respective power control groups, at pseudo-randomized positions.
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35. The base station device as claimed in claim 34, wherein the common power control channel is used by multiple subscribers on a time-division basis.
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36. The base station device as claimed in claim 34, wherein the common power control channel transmitter uses a single orthogonal code.
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37. The base station device as claimed in claim 34, wherein the subscriber channel transmitter comprises:
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an encoder for encoding data on the subscriber channel into symbol data; and
an orthogonal spreader for orthogonally spreading the encoded symbol data with an orthogonal code.
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Specification