CA2546389C - Transmission power control apparatus in wireless communication system and method therefor - Google Patents

Transmission power control apparatus in wireless communication system and method therefor Download PDF

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Publication number
CA2546389C
CA2546389C CA 2546389 CA2546389A CA2546389C CA 2546389 C CA2546389 C CA 2546389C CA 2546389 CA2546389 CA 2546389 CA 2546389 A CA2546389 A CA 2546389A CA 2546389 C CA2546389 C CA 2546389C
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Canada
Prior art keywords
channel
gain
reverse
gain value
mobile terminal
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CA 2546389
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French (fr)
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CA2546389A1 (en
Inventor
Chan Ho Kyung
Jong Hoe An
Young Woo Yun
Suk Hyon Yoon
Ki Jun Kim
Soon Yil Kwon
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LG Electronics Inc
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LG Electronics Inc
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Publication date
Priority to US51972903P priority Critical
Priority to US60/519,729 priority
Priority to KR1020030083270A priority patent/KR20050049622A/en
Priority to KR10-2003-0083270 priority
Priority to US52737403P priority
Priority to US60/527,374 priority
Priority to US60/528,428 priority
Priority to US52842803P priority
Priority to PCT/KR2004/002936 priority patent/WO2005048498A2/en
Application filed by LG Electronics Inc filed Critical LG Electronics Inc
Publication of CA2546389A1 publication Critical patent/CA2546389A1/en
Application granted granted Critical
Publication of CA2546389C publication Critical patent/CA2546389C/en
Application status is Expired - Fee Related legal-status Critical
Anticipated expiration legal-status Critical

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Classifications

    • HELECTRICITY
    • H04ELECTRIC COMMUNICATION TECHNIQUE
    • H04WWIRELESS COMMUNICATION NETWORKS
    • H04W52/00Power management, e.g. TPC [Transmission Power Control], power saving or power classes
    • H04W52/04TPC
    • H04W52/38TPC being performed in particular situations
    • H04W52/48TPC being performed in particular situations during retransmission after error or non-acknowledgment
    • HELECTRICITY
    • H04ELECTRIC COMMUNICATION TECHNIQUE
    • H04WWIRELESS COMMUNICATION NETWORKS
    • H04W52/00Power management, e.g. TPC [Transmission Power Control], power saving or power classes
    • H04W52/04TPC
    • H04W52/06TPC algorithms
    • H04W52/16Deriving transmission power values from another channel
    • HELECTRICITY
    • H04ELECTRIC COMMUNICATION TECHNIQUE
    • H04WWIRELESS COMMUNICATION NETWORKS
    • H04W52/00Power management, e.g. TPC [Transmission Power Control], power saving or power classes
    • H04W52/04TPC
    • H04W52/30TPC using constraints in the total amount of available transmission power
    • H04W52/32TPC of broadcast or control channels
    • H04W52/325Power control of control or pilot channels
    • HELECTRICITY
    • H04ELECTRIC COMMUNICATION TECHNIQUE
    • H04WWIRELESS COMMUNICATION NETWORKS
    • H04W52/00Power management, e.g. TPC [Transmission Power Control], power saving or power classes
    • H04W52/04TPC
    • H04W52/38TPC being performed in particular situations
    • H04W52/50TPC being performed in particular situations at the moment of starting communication in a multiple access environment

Abstract

The present invention provides an apparatus and method for controlling transmission powers of R-CQICH (reverse-channel quality indicator channel) and R-ACKCH (reverse-acknowledgement channel) independently. The present invention includes the steps of receiving a first parameter corresponding to the R-CQICH
and a second parameter corresponding to the R-ACKCH form a base station via an overhead message and independently determining transmission powers of the R-CQICH and the R-ACKCH using the first and second parameters.

Description

1 ' TRANSMISSION POWER CONTROL APPARATUS IN
WIRELESS COMMUNICATION SYSTEM AND METHOD THEREFOR
Field of the Invention The present invention relates to a power control method applicable to mobile communication systems, and more particularly, to a transmission power control apparatus and method using reverse channel quality indicator and acknowledgment indicator.
Background Art In radio communications, channel environment varies according to the drift of mobile terminal's location. Hence, it is preferable that the modulation and coding scheme are modified to fit the channel quality for each situation.

With regard to setting a modulation scheme, when the channel quality is good (i.e., less interference), the communication system is able to use modulation enabling high-speed data transfer, such as QAM (quadrature amplitude modulation) and M-ary PSK
(phase shift keying). However, in case that channel quality is poor, it is able to use such modulation as BPSK (binary phase shift key) resistant against interference.

With regard to setting a coding scheme, when the channel quality is good, less redundancy (thus, a high coding rate) is possible, so that data can be transmitted with higher data rate. However, when the channel environment is poor, the channel coding is performed with more redundancy (lower coding rate), so that data can be transmitted with a lower data rate.

In order to vary the modulation and coding scheme appropriately according to the variation of the channel quality, information about the current channel quality is needed. A
forward channel quality is measured by a mobile terminal and is transmitted to a base station via a reverse channel quality indicator channel (R-CQICH). It should be noted that the term reverse channel is denoted as communication originating from a mobile terminal and transmitted to a network, such as a base station.

H-ARQ (hybrid automatic repeat request) is a method for improving reliability and throughput in a manner of combining ARQ (automatic repeat request) and FEC
(forward error correction). ARQ is a method for improving transmission reliability in a manner of requesting retransmission of the same information until receiving errorless information if error exists in the transmitted information. And, FEC is a method for improving reliability in a manner of correcting errors having occurred during transmission.

During good channel quality, the frequency of errors in the received information is low.
Hence, a retransmission is requested using ARQ, whereby reliability of the received information can be maintained. However, during poor channel quality, the frequency of errors in the received information is high. If ARQ is used without FEC, it may cause the increase of the number of retransmissions. Hence, the throughput of the system will be decreased since ARQ does not have any error-correction function.

Since such a problem can be solved by FEC, the H-ARQ system using both ARQ and FEC has been proposed. As one sort of H-ARQ, there is the IR (incremental redundancy) system. In the IR system, a transmitting side initially transmits data encoded with high coding rate which have small number of redundant bits. If the receiving side receives data with errors, it requests retransmission. In response to the request, the transmitting side transmits additional redundant bits, which are caused by low rate encoding.

A receiving side combines to decode the already received data and the redundant bits.
In doing so, the retransmitted bits are to compensate the previously sent packet.

In the HARQ system of a wireless communication system, a mobile terminal decodes a received packet to check a presence or non-presence of errors and should feed back an ACK (acknowledgment) or NAK (negative acknowledgment) signal to a base station according to a result of the check. A base station having received the NAK
signal retransmits the packet. By combining to decode the retransmitted packet and the initially transmitted packet, the mobile terminal has a diversity or coding gain. The ACK/NAK
signal transmitted from the mobile terminal to the base station is transmitted to the base station via a reverse acknowledgment channel (R-ACKCH).

In a typical wireless communication system, nominal attribute gain for R-ACKCH
is set to -3dB. During the course of implementation, it has been determined that this gain was set too low for a proper ACK operation. In other words, current nominal attribute gain for R-ACKCH makes false alarm probability (probability that the base station receiver detects ACK even when the transmitter does not transmit anything on R-ACKCH) too high resulting in a large number of RLP retransmissions.

To identify the problem, simulations were performed with current nominal adjustment gain value for R-ACKCH under AWGN channel. The simulations were performed with 9600bps R-FCH on top of R-ACKCH. The pilot level was power controlled so that 1 % FER
could be achieved for R-FCH.

In FIG. 1, the line 2 represents the CDF of demodulator output when ACK signal is transmitted. The line 4 is the complementary CDF of demodulator output when the transmitter does not transmit anything. The line 6 is the complementary CDF of demodulator output when NAK signal is transmitted.

For ease of explanation, the following probabilities can be defined.
PA_N : Probability that the ACK signal is falsely detected as NAK.
PN_A: Probability that the NAK signal is falsely detected as ACK.

PNO_A : Probability that the receiver detects ACK signal even when the mobile station doesn't transmit anything on R-ACKCH.

In this example, it is assumed that one threshold is given to the output of base station demodulator so that the base station detects ACK or NAK. It should be noted that 'no signal' does not need to be differentiated from `NAK' since the base station behavior might be the same for these two cases. The criteria used for determining the threshold level is to maintain the PAN and PN_A below certain level. The choice of this level should be implementation dependent. However, PAN of 0.01 seems to be reasonable choice.
From FIG. 1, PN_A is 0.001 for this threshold, which seems quite reasonable.
However, it turns out that PNo_A is 0.3, which is a bit high for proper operation. The high PNO_A may lead to some erroneous event.

The erroneous event due to this false alarm on R-ACKCH can be explained as follows.
When a mobile terminal completely misses the forward packet data control channel given to it, the mobile terminal will not transmit any signal on the R-ACKCH. For about 30% of these situations, the base station falsely decides that ACK signal was transmitted from the mobile terminal and is going to proceed with new packet for that ARQ channel, resulting in RLP layer retransmission for that packet. Therefore, it is suggested that the channel gain (i.e., transmission power) for R-ACKCH needs to be modified to resolve this problem.

Transmission power of R-CQICH is determined using a R-CQICH power adjustment 5 gain and a R-ACKCQICH gain to a pilot power (RLGAIN ACKCQICH_PILOT). The R-CQICH power adjustment gain is individually transmitted to each mobile terminal from a base station. And, the R-ACKCQICH gain to a pilot power is commonly transmitted to the all mobile terminals from the base station.

Similarly, transmission power of R-ACKCH is determined using a R-ACKCH power adjustment gain and a R-ACKCQICH gain to a pilot power (RLGAIN
ACKCQICH_PILOT).
The R-ACKCH power adjustment gain is individually transmitted to each mobile terminal from a base station. And, the R-ACKCQICH gain to a pilot power is commonly transmitted to all the mobile terminals from the base station.

As mentioned in the foregoing description, in determining each of the R-CQICH
and R-ACKCH transmission powers, the R-ACKCQICH gain to a pilot power (RLGAIN ACKCQICH_PILOT) is commonly used. However, because the common factor (RLGAIN ACKCQICH_PILOT) is used in determining both the R-CQICH and the R-ACKCH transmission powers, the following problems are inevitable.

For all mobile terminals in a cell, it may occur that the transmission power of R-ACKCH
needs to be increased but the transmission power of R-CQICH need to be maintained. In such a case, the R-ACKCH power adjustment gain should be transmitted to all mobile terminals in the cell individually.

This is because the transmission power of R-CQICH is increased as well as that of R-ACKCH, if the R-ACKCQICH gain to a pilot power (RLGAIN
ACKCQICH_PILOT) is transmitted to all mobile terminals in a cell using an overhead message.

For instance, in detecting ACK/NAK, the base station performs a threshold detection using the receiving power of R-ACKCH. Hence, in case that the transmission power of R-ACKCH is too small, the base station may incorrectly detect No-signal as NAK. If the R-ACKCQICH gain to a pilot power (RLGAIN ACKCQICH_PILOT) is transmitted to all mobile terminals to solve the problem, the transmission power of R-CQICH is unnecessarily increased to be inefficient. Meanwhile, if the base station transmits the R-ACKCH power adjustment gain to each of the mobile terminals, a message load transmitted to the mobile terminal increases and the corresponding transmission process gets very complicated.
Disclosure of Invention According to an aspect of the present invention, there is provided a method of controlling, by a mobile terminal, transmission power in a mobile communication system, the method comprising: receiving a packet data from a base station; receiving a first gain value and a second gain value from the base station, wherein the first gain value is associated with controlling transmission power of an acknowledgment channel for transmitting acknowledge information for the packet data, and the second gain value is associated with controlling transmission power of a channel quality indicator channel for transmitting channel quality information; and determining an acknowledgment channel power for the acknowledgment channel by using the first gain value, wherein the acknowledgment channel power is determined by: acknowledgment channel power = mean pilot channel output power + Y*(Nominal_Reverse Acknowledgment_Channel_Attribute_Gain + Reverse_ Channel Adjustment_Gain for the acknowledgment channel -Multiple_Channel Adjustment_Gain for the acknowledgment channel +
first gain value), where the mean pilot channel output power is a mean power value of a reverse pilot channel, the Y is a constant, the Nominal-Reverse-Acknowledgment-Channel-Attribute-Gain is a gain value previously known to the mobile terminal, the Reverse Channel Adjustment_Gain is a gain value that the base station informs the mobile terminal via message, and the Multiple-Channel Adjustment_Gain is a gain value used when at least two code channels as well as the reverse pilot channel are assigned to the mobile terminal.

According to another aspect of the present invention, there is provided a method of controlling, by a base station, transmission power in a mobile communication system, the method comprising: transmitting a packet data to a mobile terminal; transmitting a first gain value and a second gain value to the mobile terminal, wherein the first gain value is associated with controlling transmission power of an acknowledgment channel for transmitting acknowledge information for the packet data, and the second gain value is associated with controlling transmission power of a channel quality indicator channel for transmitting channel quality information; and receiving the acknowledge information from the mobile terminal through the acknowledgment channel transmitted at an acknowledgment channel power determined by the mobile terminal using the first gain value, wherein the acknowledgment channel power is determined by: acknowledgment channel power =
mean pilot channel output power + Y*(Nominal_Reverse Acknowledgment_Channel_Attribute_Gain + Reverse-Channel-Adjustment-Gain for the acknowledgment channel -Multiple-Channel-Adjustment-Gain for the acknowledgment channel + first gain value), where the mean pilot channel output power is a mean power value of a reverse pilot channel, the Y is a constant, the Nominal-Reverse-Acknowledgment-Channel-Attribute-Gain is a gain value previously known to the mobile terminal, the Reverse-Channel-Adjustment-Gain is a gain value that the base station informs the mobile terminal via message, and the Multiple-Channel-Adjustment-Gain is a gain value used when at least two code channels as well as the reverse pilot channel are assigned to the mobile terminal.

Some embodiments are directed to a transmission power control method of R-CQICH (reverse-channel quality indicator channel) and R-ACKCH
(reverse-acknowledgement channel) that may substantially obviate one or more problems due to limitations and disadvantages of the related art.

Some embodiments may provide an apparatus and method for controlling transmission powers of R-CQICH (reverse-channel quality indicator channel) and R-ACKCH
(reverse-acknowledgement channel) independently.

Additional advantages and features of some embodiments of the invention will be set forth in part in the description which follows and in part will become apparent to those having ordinary skill in the art upon examination of the following or may be learned from practice of the invention. The objectives and other advantages of some embodiments of the invention may be realized and attained by the structure particularly pointed out in the written description and claims hereof as well as the appended drawings.

In another aspect, a method of controlling transmission power in a mobile communication system comprises receiving a packet data from a network and determining whether the packet data is received correctly, receiving a first gain value (for example, RLGAIN_ACKCH_PILOT) and a second gain value (for example, RLGAIN_CQICH_PILOT) from the network, wherein the first gain value is associated with controlling transmission power for transmitting data acknowledge information (ACK), and the second gain value is associated with controlling transmission power for transmitting channel quality information independent from the first gain value, and the first and second gain values are capable of being received by a plurality of mobile terminals associated with the network;
and determining an acknowledgement channel power by using at least a nominal reverse acknowledgement channel attribute gain and the first gain value.

According to one embodiment, the method further comprises determining a channel quality indicator channel power by using at least a nominal reverse channel quality indicator channel attribute gain and the second gain value.

According to another embodiment, at least one of the first gain value and the second gain value is received through an overhead message from the network, the overhead message capable of being received by mobile terminals in at least one cell controlled by the network. Preferably, the overhead message comprises at least one of ESPM
(Extended System Parameters Message) and MCRRPM (MC-RR Parameters Message). The first and the second gain values are transmitted using at least one of UHDM (Universal Handoff Direction Message) and ECAM (Extended Channel Assignment Message).

According to another embodiment, the acknowledgement channel power is determined by:

acknowledgement channel power = mean pilot channel output power + Y
(Nominal-Reverse-Acknowledgement-Channel-Attribute-Gain + Reverse Channel-Adjustment-Gain for the acknowledgement channel -Multiple_Channel Adjustment_Gain for the acknowledgement channel + first gain value), wherein the mean pilot channel output power is a mean power value of a reverse pilot channel, the Y is a constant, the Nominal_Reverse Acknwoledgement_Channel Attribute_Gain is a gain value previously known to the network and the mobile terminal, the Reverse_ChannelAdjustment Gain[R-ACKCH] is a gain value that the network informs each mobile terminal via message, the Multiple_Channel Adjustment_Gain is a gain value used when at least two code channels are assigned to the mobile terminal as well as the reverse pilot channel, wherein the value of Y is preferably 0.125.

According to another embodiment, the method further comprises determining a channel quality indicator channel power by using at least a nominal reverse channel quality indicator channel attribute gain and the second gain value.

According to another embodiment, the channel quality indicator channel power is determined by:

channel quality indicator channel power = mean pilot channel output power +
Y *(Nominal Reverse Channel Quality_Indicator Channel_Attribute_Gain +
Reverse_Channel_Quality_lndicator Channel Attribute Adjustment_Gain + Reverse-Channel-Adjustment-Gain for a channel quality indicator channel - Multiple-Channel-Adjustment-Gain for the channel quality indicator channel +
second gain value), wherein the mean pilot channel output power is a mean power value of a reverse pilot channel, the Y is a constant, the Nominal_Reverse_Channel_Quality_Indicator_Channel Attribute_Gain is a gain value previously known to the network and the mobile terminal, the Reverse_Channel_Quality_Indicator_ChannelAttribute Adjustment_Gain is a gain value that the network informs each mobile terminal via message, the Reverse-Channel Adjustment_Gain is a gain value that the network informs each terminal via message, the Multiple_Channel Adjustment_Gain is a gain value used when at least two code channels are assigned to the mobile terminal as well as the reverse pilot channel. The value of Y is preferably 0.125.

According to another aspect, a mobile terminal for controlling transmission power in a mobile communication system comprises means for receiving a packet data from 5 a network and determining whether the packet data is received correctly;
means for receiving a first gain value and a second gain value from the network, wherein the first gain value is associated with controlling transmission power for transmitting data acknowledge information, and the second gain value is associated with controlling transmission power for transmitting channel quality information independent from the first gain value, and the first and second 10 gain values are capable of being received by a plurality of mobile terminals associated with the network; and means for determining an acknowledgement channel power by using at least a nominal reverse acknowledgement channel attribute gain and the first gain value.

According to another aspect, a method of controlling transmission power comprises transmitting a packet data to a mobile terminal; transmitting a first gain value and a second gain value to the mobile terminal, wherein the first gain value is associated with controlling transmission power for transmitting data acknowledge information, and the second gain value is associated with controlling transmission power for transmitting channel quality information independent from the first gain value, and the first and second gain values are capable of being received by a plurality of mobile terminals associated with the network; and receiving the data acknowledgement information from the mobile terminal through an acknowledgement channel transmitted at acknowledgement channel power determined by the mobile terminal using at least a nominal reverse acknowledgement channel attribute gain and the first gain value.

According to one embodiment, the network further comprises receiving a channel quality indicator through a channel quality indicator channel transmitted by the mobile terminal with channel quality indicator channel power determined by using at least a nominal reverse channel quality indicator channel attribute gain and the second gain value.

Some embodiments enable efficient control of the transmission powers of the R-CQICH and R-ACKCH. Some embodiments reduce overhead messages being transmitted from the base station to the mobile terminal.

It is to be understood that both the foregoing general description and the following detailed description of some embodiments of the present invention are exemplary and explanatory and are intended to provide further explanation of the invention as claimed.

Brief Description of The Drawings The accompanying drawings, which are included to provide a further understanding of the invention and are incorporated in and constitute a part of this application, illustrate embodiment(s) of the invention and together with the description serve to explain the principle of the invention. In the drawings:

FIG. I is simulation results with R-ACKCH nominal attribute gain of -3dB.
FIG. 2 is a flowchart of a transmission power control method of R-CQICH.
FIG. 3 is a flowchart of a transmission power control method of R-ACKCH.
FIG. 4 is an exemplary diagram of an overhead message format including RLGAIN_CQICH_PILOT and RLGAIN ACKCH_PILOT values.

FIG. 5 illustrates a mobile communication device according to one embodiment of the present invention.

Best Mode for Carrying Out The Invention Reference will now be made in detail to the preferred embodiments of the present invention, examples of which are illustrated in the accompanying drawings.
Wherever possible, the same reference numbers will be used throughout the drawings to refer to the same or like parts. Although the present invention is illustrated with respect to a mobile terminal, it is contemplated that the present invention may be utilized anytime it is desired to provide new transport configurations for establishing a connection between a mobile communication device and a network (also referred to as a base station).

FIG. 2 is a flowchart of a transmission power control method for R-CQICH.
Referring to FIG. 2, a mobile terminal receives a signal transmitted from a base station (S11) and then estimates a current forward channel quality (S12). And, the mobile terminal computes an R-CQICH transmission power using a CQICH power gain to a reverse pilot power value RLGAIN_CQICH_PILOT received from the base station (SI3, S14). It should be noted that the steps of estimating the current forward channel quality (SI 2) and receiving RLGAIN_CQICH_PILOT from the base station (S13) may be interchanged.

Preferably, the transmission power of R-CQICH is computed using Equation 1.
[Equation 1] PRCQICH = mean pilot channel output power + 0.125 *(Nominal_ Reverse_Channel_Quality_Indicator_Channel_Attribute_Gain + Reverse_Channel_Quality_Indicator Channel Attribute_Adjustment Gain + Reverse_Channel_Adjustment_Gain[R-CQICH]

- Multiple-Channel-Adjustment Gain[R-CQICH]+ RLGAIN_CQICH_PILOT) In Equation 1, the mean pilot channel output power is a mean power value of a reverse pilot channel, Nominal_Reverse_Channel_Quality_Indicator Channel_Attribute_Gain is a gain value previously known to a base station and a mobile terminal, Reverse_Channel_Quality_lndicator Channel_Attribute_Adjustment Gain[R-CQICH]
is a gain value that the base station informs each mobile terminal via message if necessary, Reverse_ChannelAdjustment Gain[R-CQICH] is a gain value that the base station informs each mobile terminal via message if necessary, Multiple-Channel Adjustment_Gain[R-CQICH] is a gain value used when at least two code channels are assigned to the mobile terminal as well as the reverse pilot channel, and RLGAIN_CQICH_PILOT is a gain value of R-CQICH power to a reverse pilot channel power that the base station informs the all mobile terminals in a cell via an overhead message.

FIG. 3 is a flowchart of a transmission power control method for R-ACKCH.
Referring to FIG. 3, data are preferably transmitted at high data rate between the base station and the mobile terminal in a following manner.

A base station transmits a packet to a mobile terminal. And, the mobile terminal having received the packet (S21) performs decoding thereon (S22).

If the decoding is successful (S22) (i.e., there is no error in the decoded data), the mobile terminal transmits an acknowledgment (ACK) signal to the base station to inform the successful decoding. The base station having received the ACK signal transmits a next packet.

If the decoding fails (S22), the mobile terminal transmits a non-acknowledgement (NAK) signal to the base station to inform the decoding failure (S25). The base station having received the NAK signal retransmits the packet.

The ACK/NAK signal is transmitted via a R-ACKCH. The transmission power of R-ACKCH is computed using the ACKCH power gain to a reverse pilot power value (RLGAIN ACKCH_PILOT) received from the base station (523, S24). And, the ACK/NAK
signal is transmitted to the base station with the computed transmission power (S25).

Preferably, the transmission power of R-ACKCH is computed using Equation 2.
[Equation 2] PACKCH = mean pilot channel output power + 0.125 * (Nominal_ReverseAcknowledgement_Channel_Attribute_Gain + Reverse_ Channel Adjustment_Gain[R-ACKCH]

- Multiple-Channel-Adjustment-Gain [R-ACKCH] + RLGAIN ACKCH_PILOT) In Equation 2, the mean pilot channel output power is a mean power value of a reverse pilot channel, Nominal-Reverse-Acknowledgement-Channel-Attribute-Gain is a gain value previously known to a base station and mobile terminal, Reverse_ChannelAdjustment Gain[R-ACKCH] is a gain value that the base station informs each mobile terminal via message if necessary, Multiple_ChannelAdjustment Gain[R-ACKCH] is a gain value used when at least two code channels are assigned to the mobile terminal as well as the reverse pilot channel, and RLGAIN ACKCH_PILOT as a gain value of R-ACKCH power to a reverse pilot channel power that the base station informs the all mobile terminals in a cell via an overhead message.

FIG. 4 is an exemplary diagram of an overhead message format including RLGAIN_CQICH_PILOT and RLGAIN ACKCH_PILOT values. Such message is transmitted from a base station to a mobile station residing in a cell controlled by such base station.

Referring to FIG. 4, RLGAIN_CQICH_PILOT and RLGAIN ACKCH_PILOT values for computing the transmission powers of R-CQICH and R-ACKCH, respectively, can be transmitted using one or more fields of ESPM (Extended System Parameters Message), 5 MCRRPM (MC-RR Parameters Message), UHDM (Universal Handoff Direction Message), and ECAM (Extended Channel Assignment Message). The ESPM and MCRRPM are common channel messages which are provided to a plurality of mobile terminals in a cell.
On the other hand, UHDM and ECAM are dedicated messages which are provided to a specific mobile terminal in a cell.

10 Accordingly, the present invention efficiently controls the transmission powers of each of the R-CQICH and R-ACKCH. And, the present invention reduces the amount of data being transmitted from the base station to the mobile terminal.

Referring to FIG. 5, a block diagram of a mobile communication device 400 of the present invention is illustrated, for example a mobile phone for performing the methods of 15 the present invention. The mobile communication device 400 includes a processing unit 410 such as a microprocessor or digital signal processor, an RF module 435, a power management module 405, an antenna 440, a battery 455, a display 415, a keypad 420, a storage unit 430 such as flash memory, ROM or SRAM, a speaker 445, a microphone 450, and, optionally, a SIM card 425.

A user enters instructional information, such as a telephone number, for example, by pushing the buttons of the keypad 420 or by voice activation using the microphone 450.
The processing unit 410 receives and processes the instructional information to perform the appropriate function, such as to dial the telephone number. Operational data may be retrieved from the storage unit 430 to perform the function. Furthermore, the processing unit 410 may display the instructional and operational information on the display 415 for the user's reference and convenience.

The processing unit 410 issues instructional information to the RF section 435, to initiate communication, for example, by transmitting radio signals comprising voice communication data. The RF module 435 includes a receiver and a transmitter to receive and transmit radio signals. The antenna 440 facilitates the transmission and reception of radio signals. Upon receiving radio signals, the RF module 435 may forward and convert the signals to baseband frequency for processing by the processing unit 410.
The processed signals may be transformed into audible or readable information output, for example, via the speaker 445.

It will be apparent to one skilled in the art that the steps described in FIGS. 2 - 4 may be readily implemented using, for example, the processing unit 410 or other data or digital processing device, either alone or in combination with external support logic.

Although the present'invention is described in the context of mobile communication, the present invention may also be used in any wireless communication systems using mobile devices, such as PDAs and laptop computers equipped with wireless communication capabilities. Moreover, the use of certain terms to describe the present invention should not limit the scope of the present invention to certain type of wireless communication system, such as CDMA. The present invention is also applicable to other wireless communication systems using different air interfaces and/or physical layers, for example, TDMA, FDMA, WCDMA, UMTS, etc.

The preferred embodiments may be implemented as a method, apparatus or article of using standard programming and/or engineering techniques to produce manufacture software, firmware, hardware, or any combination thereof. The term "article of manufacture" as used herein refers to code or logic implemented in hardware logic (e.g., an integrated circuit chip, Field Programmable Gate Array (FPGA), Application Specific Integrated Circuit (ASIC), etc.) or a computer readable medium (e.g., magnetic storage medium (e.g., hard disk drives, floppy disks, tape, etc.), optical storage (CD-ROMs, optical disks, etc.), volatile and non-volatile memory devices (e.g., EEPROMs, ROMs, PROMs, RAMs, DRAMs, SRAMs, firmware, programmable logic, etc.).

Code in the computer readable medium is accessed and executed by a processor.
The code in which preferred embodiments are implemented may further be accessible through a transmission media or from a file server over a network. In such cases, the article of manufacture in which the code is implemented may comprise a transmission media, such as a network transmission line, wireless transmission media, signals propagating through space, radio waves, infrared signals, etc. Of course, those skilled in the art will recognize that many modifications may be made to this configuration without departing from the scope of the present invention, and that the article of manufacture may comprise any information bearing medium known in the art.

The logic implementation shown in the figures described specific operations as occurring in a particular order. In alternative implementations, certain of the logic operations may be performed in a different order, modified or removed and still implement preferred embodiments of the present invention. Moreover, steps may be added to the above described logic and still conform to implementations of the invention.

It will be apparent to those skilled in the art that various modifications and variations can be made in the present invention. Thus, it is intended that the present invention covers the modifications and variations of this invention provided they come within the scope of the appended claims and their equivalents.

Claims (14)

1. A method of controlling, by a mobile terminal, transmission power in a mobile communication system, the method comprising:

receiving a packet data from a base station;

receiving a first gain value and a second gain value from the base station, wherein the first gain value is associated with controlling transmission power of an acknowledgment channel for transmitting acknowledge information for the packet data, and the second gain value is associated with controlling transmission power of a channel quality indicator channel for transmitting channel quality information; and determining an acknowledgment channel power for the acknowledgment channel by using the first gain value, wherein the acknowledgment channel power is determined by:

acknowledgment channel power = mean pilot channel output power + Y*(Nominal_Reverse Acknowledgment_Channel_Attribute_Gain +
Reverse_ Channel Adjustment_Gain for the acknowledgment channel -Multiple_Channel Adjustment_Gain for the acknowledgment channel +
first gain value), where the mean pilot channel output power is a mean power value of a reverse pilot channel, the Y is a constant, the Nominal Reverse Acknowledgment Channel_Attribute_Gain is a gain value previously known to the mobile terminal, the Reverse_Channel_Adjustment_Gain is a gain value that the base station informs the mobile terminal via message, and the Multiple_Channel Adjustment Gain is a gain value used when at least two code channels as well as the reverse pilot channel are assigned to the mobile terminal.
2. The method of claim 1, further comprising:

transmitting the acknowledgment channel at the acknowledgment channel power to the base station.
3. The method of claim 1, further comprising:

determining a channel quality indicator channel power for the channel quality indicator channel by using the second gain value, wherein the channel quality indicator channel power is determined by:

channel quality indicator channel power = mean pilot channel output power + Y*(Nominal_Reverse_Channel_Quality_Indicator_Channel Attribute_Gain + Reverse_Channel_ Quality_Indicator Channel_Attribute_Adjustment_Gain + Reverse_Channel_Adjustment_Gain for the channel quality indicator channel_Multiple_Channel_Adjustment_Gain for the channel quality indicator channel + second gain value), where the mean pilot channel output power is a mean power value of a reverse pilot channel, the Y is a constant, the Nominal_Reverse_Channel_Quality_Indicator_Channel_Attribute_Gain is a gain value previously known to the mobile terminal, the Reverse_Channel_Quality_Indicator_Channel_Attribute_Adjustment_Gain is a gain value that the base station informs the mobile terminal, the Reverse_Channel_Adjustment_Gain is a gain value that the base station informs the mobile terminal via message, and the Multiple_Channel_Adjustment_Gain is a gain value used when at least two code channels as well as the reverse pilot channel are assigned to the mobile terminal.
4. The method of claim 3, further comprising:

transmitting the channel quality indicator channel at the channel quality indicator channel power to the base station.
5. The method of any one of claims 1 to 4, wherein at least one of the first gain value and the second gain value is received from the base station through an overhead message that the base station transmits to all mobile terminals within at least one cell controlled by the base station.
6. The method of claim 5, wherein the overhead message comprises at least one of ESPM (Extended System Parameters Message) and MCRRPM (MC-RR
Parameters Message).
7. The method of claim 1, wherein the first and the second gain values are transmitted using at least one of UHDM (Universal Handoff Direction Message) and ECAM (Extended Channel Assignment Message).
8. The method of any one of claims 1 to 4, wherein the Y is 0.125.
9. A method of controlling, by a base station, transmission power in a mobile communication system, the method comprising:

transmitting a packet data to a mobile terminal;

transmitting a first gain value and a second gain value to the mobile terminal, wherein the first gain value is associated with controlling transmission power of an acknowledgment channel for transmitting acknowledge information for the packet data, and the second gain value is associated with controlling transmission power of a channel quality indicator channel for transmitting channel quality information; and receiving the acknowledge information from the mobile terminal through the acknowledgment channel transmitted at an acknowledgment channel power determined by the mobile terminal using the first gain value, wherein the acknowledgment channel power is determined by:

acknowledgment channel power = mean pilot channel output power + Y*(Nominal_Reverse_Acknowledgment_Channel_Attribute_Gain + Reverse_ Channel_Adjustment_Gain for the acknowledgment channel -Multiple_Channel_Adjustment_Gain for the acknowledgment channel + first gain value), where the mean pilot channel output power is a mean power value of a reverse pilot channel, the Y is a constant, the Nominal_Reverse_Acknowledgment_Channel_Attribute_Gain is a gain value previously known to the mobile terminal, the Reverse_Channel_Adjustment_Gain is a gain value that the base station informs the mobile terminal via message, and the Multiple_Channel Adjustment_Gain is a gain value used when at least two code channels as well as the reverse pilot channel are assigned to the mobile terminal.
10. The method of claim 9, further comprising:

receiving the channel quality indicator from the mobile terminal through the channel quality indicator channel transmitted at a channel quality indicator channel power determined by the mobile terminal using the second gain value, wherein the channel quality indicator channel power is determined by:

channel quality indicator channel power = mean pilot channel output power + Y*(Nominal_Reverse_Channel_Quality_Indicator_Channel_Attribute_Gain + Reverse_Channel_Quality_Indicator_Channel_Attribute_Adjustment_Gain + Reverse-Channel_Adjustment_Gain for the channel quality indicator channel -Multiple_Channel_Adjustment_Gain for the channel quality indicator channel + second gain value), where the mean pilot channel output power is a mean power value of a reverse pilot channel, the Y is a constant, the Nominal_Reverse_Channel_Quality_Indicator_Channel_Attribute_Gain is a gain value previously known to the mobile terminal, the Reverse_Channel_Quality_Indicator_Channel_Attribute_Adjustment_Gain is a gain value that the base station informs the mobile terminal, the Reverse_Channel_Adjustment_Gain is a gain value that the base station informs the mobile terminal via message, and the Multiple_Channel_Adjustment_Gain is a gain value used when at least two code channels as well as the reverse pilot channel are assigned to the mobile terminal.
11. The method of claim 9 or 10, wherein at least one of the first gain value and the second gain value is transmitted to the mobile terminal through an overhead message that the base station transmits to all mobile terminals within at least one cell controlled by the base station.
12. The method of claim 11, wherein the overhead message comprises at least one of ESPM (Extended System Parameters Message) and MCRRPM (MC-RR
Parameters Message).
13. The method of claim 9, wherein the first and the second gain values are transmitted using at least one of UHDM (Universal Handoff Direction Message) and ECAM (Extended Channel Assignment Message).
14. The method of claim 9 or 10, wherein the Y is 0.125.
CA 2546389 2003-11-13 2004-11-12 Transmission power control apparatus in wireless communication system and method therefor Expired - Fee Related CA2546389C (en)

Priority Applications (9)

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US51972903P true 2003-11-13 2003-11-13
US60/519,729 2003-11-13
KR1020030083270A KR20050049622A (en) 2003-11-22 2003-11-22 Method of power control for r-cqich and r-ackch in mobile communication
KR10-2003-0083270 2003-11-22
US52737403P true 2003-12-05 2003-12-05
US60/527,374 2003-12-05
US52842803P true 2003-12-09 2003-12-09
US60/528,428 2003-12-09
PCT/KR2004/002936 WO2005048498A2 (en) 2003-11-13 2004-11-12 Transmission power control method in a wireless communication system

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US7561893B2 (en) 2002-04-10 2009-07-14 Koninklijke Philips Electronics N.V. Communication system using ARQ
US7965683B2 (en) * 2008-06-16 2011-06-21 Motorola Mobility, Inc. Mechanism for maximizing uplink bandwidth by overlapping control regions in WiMAX systems
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US6628956B2 (en) 1999-03-15 2003-09-30 Telefonaktiebolaget Lm Ericsson (Publ) Adaptive power control in a radio communications systems
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US7379434B2 (en) 2001-10-19 2008-05-27 Koninklijke Philips Electronics N.V. Radio communication system
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