KR20030043314A - Methods and apparatus for transmission power control for User Equipment IN CDMA MOBILE COMMUNICATION SYSTEM - Google Patents

Abstract

PURPOSE: A method and a device for controlling transmission power of a terminal device in a CDMA(Code Division Multiple Access) mobile communication system are provided to control transmission power for each channel separately, if more than two channels are arranged in the uplink. CONSTITUTION: A base station decides whether a UE(User Equipment) receiving an HS-DSCH(High Speed-Downlink Shared CHannel) from the base station is arranged in a soft handover region(900). The base station receives a pilot field of a UL_DPCCH(UpLink_Dedicated Physical Control CHannel) and a TPC(Transmit Power Control command) transmitted through the UL_DPCCH from the UE(901). The base station interprets the pilot field of the UL_DPCCH(902). The base station discriminates whether the received pilot field for an S-UL_DPCCH(Secondary_UL_DPCCH) or for a UL_DPCH(UpLink_Dedicate Physical CHannel)(903). If, for the UL_DPCH, the base station generates a TPC to be applied to the UL_DPCH(911), and if, for the S-UL_DPCCH, the base station generates a TPC to be applied to the S-UL_DPCCH(904). The base station decides downward transmission power according to the TPC received in the step 901, and transmits the TPC decided in the step 911 or 904 to the UE(905). If the UE is out of the soft handover region or the transmission of the HS-DSCH to the UE is completed(906), uplink transmission power to the UE is controlled through a normal power control algorithm(907).

Description

TECHNICAL FIELD AND METHOD AND APPARATUS FOR TRANSMISSION POWER CONTROL FOR USER EQUIPMENT IN CDMA MOBILE COMMUNICATION SYSTEM}

The present invention relates to an apparatus and a method for controlling reverse transmission power of a mobile station in a base station of a code division multiple access communication system. In particular, a high speed downlink shared channel (hereinafter referred to as "HS-DSCH") An apparatus and method for power control of a reverse dedicated physical channel for

In general, a high speed downlink packet access method (hereinafter referred to as "HSDPA") is a forward data channel (high speed-downlink shared channel) for supporting forward high speed packet transmission in a third generation asynchronous mobile communication system. The control channel and data channels associated with the HS-DSCH and the service using the channels are collectively referred to.

Three new technologies have been introduced in the HSDPA to support forward high speed packet transmission.

First, the new technology used in the HSDPA is an adaptive modulation and coding (AMC) technique. The AMC scheme determines a modulation scheme and a coding scheme of a forward data channel according to a channel state between a base station or a cell and a terminal or a user equipment (hereinafter referred to as "UE"). This enables high-speed packet transmission to the UE, thereby increasing the data rate of the entire cell. The combination of the modulation method and the coding method is called a modulation and coding scheme (hereinafter referred to as "MCS"). The MCS may be defined as a plurality of MCSs from level 1 to level n. The AMC refers to a method of adaptively determining a level of the MCS according to a channel state between a user and a cell, thereby increasing overall data transmission efficiency.

Secondly, a new technology used for HSDPA is a multi-channel Stop And Wait Hybrid Automatic Retransmission Request (hereinafter referred to as "n-channel SAW HARQ"). The n-channel SAW HARQ scheme is described as follows.

In the conventional automatic retransmission scheme, an acknowledgment (ACK) or a non-acknowledgement signal (hereinafter referred to as NACK) and a retransmission packet are exchanged by signaling of an upper layer in a UE and a base station control period. In 3GPP, the base station controller is referred to as a radio network controller (hereinafter, referred to as "RNC"). However, in HSDPA, some of the medium access control (MAC) functions of the conventional RNC are moved to the base station, and the ACK and the retransmission packet are transmitted through the physical channel between n UEs and the base station. Exchange. Some of the MAC functions transferred to the base station are referred to as "MAC-HS-DSCH", and 3GPP uses the base station as the term Node-B.

In addition, n logical channels are configured to transmit multiple packets even when the base station or cell does not receive an ACK or NACK from the terminal. This will be described below. In the conventional Stop and WaitARQ scheme, after receiving a packet, after receiving an ACK or a NACK for the packet, other packets can be transmitted or retransmitted. The conventional stop-standby automatic retransmission scheme is simple to operate, and although a terminal or a base station can transmit a packet, it has a disadvantage of waiting for an ACK or NACK response. In the n-channel SAW HARQ used in the HADPA, n logical channels are established between the UE and the base station, and the channels are identified by a specific time or explicit channel number, thereby transmitting an ACK or NACK for a packet received by the UE. At the same time, other packets can be received from the base station or the cell. The UE may know which channel the packet received at any point in time by prior appointment with the base station or cell, and reconstruct the packets in the order transmitted by the base station or cell after reception.

Finally, Fast Cell Selection (hereinafter referred to as "FCS") is a new technology used in DSDPA. The FSC technique is described below.

When the UE receiving the HSDPA enters a soft handover region, it selects a cell or base station that maintains the best channel state, receives a packet only from the cell or base station, and receives a data rate. It is a technique to reduce the overall interference (interference) by using a single transmission base station or cell of the high-speed HSDSCH.

In order to apply the newly used techniques by introducing HSDPA as described above, new control signals are exchanged between the UE and the base station or cell. The information to be transmitted from the base station or cell to the UE is basically a multi code transmission method for high-speed transmission, so information related to decoding and information on packets to which the HS-DSCH is transmitted That is, the number of packets of which channel, the HARQ information related to whether the initial transmission or retransmission should be transmitted. The decoding-related information includes information about channel codes on which the HS-DSCH is transmitted, MCS level used for the HS-DSCH, and code unit information necessary for interpreting the HS-DSCH after receiving the HS-DSCH. The information to be transmitted from the UE to the base station or cell includes ACK or NACK information on the received packets, and measurement information on channel conditions between the UE and the base station or cell for supporting AMC and FCS. In addition, when the cell having the best channel state is changed in the FCS, the UE should transmit the information to the base station or the cell to provide the UE with the information so that the selected optimal cell can correctly transmit the HS-DSCH.

FIG. 1 is a diagram illustrating transmission of forward control information and forward data and transmission of backward control information and backward data for HSDPA with base stations when the UE is located in a cell overlap region.

In FIG. 1, the number of cells in the cell overlapping region is limited to two for convenience of description. However, even when the number of cells in the cell overlapping region is two or more, the problem described in the description of FIG. 1 may occur.

The cell # 1 101 of FIG. 1 is a cell for transmitting the HS-DSCH to the UE 111 and is called a primary cell. Cell # 2 103 of FIG. 1 transmits a downlink dedicated physical channel (hereinafter referred to as "DL DPCH") to the UE 111 and an uplink dedicated physical channel (hereinafter referred to as "DL DPCH"). Cell called "UL DPCH".

1 is a diagram illustrating the structure of the channels transmitted in the forward direction is shown in Figures 2a to 2c, the structure of the channels transmitted in the reverse direction in Figure 1 is 3a to 3b.

2A to 2C illustrate structures of channels transmitted in a forward direction to a UE using HSDPA, and FIGS. 3A to 3B illustrate structures of channels transmitted in a backward direction by a UE using HSDPA. One drawing.

FIG. 2A illustrates a structure of a high speed physical downlink shared channel (hereinafter, referred to as "HS-PDSCH") transmitted by the 101 cell # 1 of FIG. 1 to the UE 111. The HS_PDSCH is transmitted based on three time slots (Slot # 1, Slot # 2, Slot # 3) having a length of 0.67 ms. The transmission rate of the HS_PDSCH is determined by the MCS level used and how many channel codes are used. The channel code is a channel used for distinguishing different up / down channels in an asynchronous mobile communication system and has a length defined from 4 to 512. The length of each channel code means a spread rate of data.

FIG. 2B is a diagram illustrating a structure of a downlink dedicated physical channel (hereinafter, referred to as "DL_DPCH") transmitted from 101 cell # 1 and 103 cell # 2 of FIG. 1 to a 111 UE. The DL_DPCH includes a downlink dedicated physical data channel (hereinafter referred to as "DL_DPDCH") and a downlink dedicated physical control channel (hereinafter referred to as "DL_DPCCH"). The first data field 212 and the second data field 215 of FIG. 2B are areas for transmitting user data such as higher layer signaling or voice data. A transmit power control command (TPC) field 213 is a field for transmitting a power control command for power control of an uplink transmission channel from a UE to a cell. The TFCI field 214 is a field for transmitting a transmitted format combination indicator (hereinafter referred to as "TFCI"). The TFCI field 214 transmits information necessary for transmission rates, channel configuration types, and channel decoding of the first data field 212 and the second data field 215. The pilot field 216 of FIG. 2B is a field used to allow the UE to estimate the downlink channel environment from the cell to the UE. From the first data field 212 to the pilot field 216 constitutes a time slot having a length of 2560 chips. 15 timeslots form one radio frame having a length of 10ms. The radio frame is the most basic physical transmission unit used in 3 GPP, which is a standard for asynchronous mobile communication. The DL_DPCH is a channel transmitted by all cells or base stations in the cell overlap area when the UE is located in the cell overlap area. For example, FIG. 1 illustrates a channel transmitted from the cell # 1 101 and the cell # 2 103 of FIG. 1 to the UE 111.

2C illustrates a structure of a shared control channel (hereinafter referred to as SHCCH). The SHCCH is a channel for transmitting control information necessary for reception of the HS_DSCH transmitted from the cell # 1 101 of FIG. 1 to the UE 111, and is alternately received by UEs in a corresponding base station or a cell providing an HSDPA service. It is a shared channel. The SHCCH may transmit control information necessary for reception of the HS-DSCH to one UE or a plurality of UEs at any time. The SHCCH 221 of FIG. 2C has three time slots (Solt # 1, Slot # 2, Slot # 3) as a basic unit, and transmits a format resource indicator during the period of the three time slots. (Hereinafter referred to as "TFRI") information 223 and HARQ information 225 is transmitted. The TFRI information 223 includes MCS level used for the HS_DSCH, the number and type of channel codes, and information necessary for decoding the HS-DSCH. The HARQ information 225 indicates the number of channels to be transmitted in the HSDPA using the n-channel STW HARQ system, and whether the packet to be transmitted through the HS_PDSCH is an initial transmission packet or an error is retransmitted. Tells whether or not The SHCCH is a channel transmitted only to the UE receiving the HSDPA from the cell transmitting the HSDPA, and is a channel only received from the cell transmitting the HSDPA even if the UE is located in a cell overlap region. Referring to FIG. 1, only cell # 1 101 that transmits HS_DSCH transmits the SHCCH to UE 111.

3A to 3B correspond to downlink channels shown in FIGS. 2A to 2C, and are diagrams showing uplink channels from a UE to cells.

3A illustrates an uplink dedicated physical channel (UL_DPCH) and an uplink dedicated physical data channel (UL_DPDCH) and an uplink dedicated physical control channel (UPlink Dedicated). Physical Control Channel: hereinafter referred to as "UL_DPCCH". The UL_DPDCH is a channel for transmitting uplink control information or user information from a UE to a cell or cells. The UL_DPCCH is a channel through which physical control information is transmitted. The function of each field is basically the same as that of DL_DPCCH. The UL_DPCCH and UL_DPDCH are channel coded through different channel codes, and are transmitted through I and Q channels of Quadrature Phase Shift Keying (QPSK). The basic transmission unit of the UL_DPCH is a 10 ms radio frame, and the 10 ms radio frame consists of 15 timeslots. Each of the timeslots consists of a pilot field 312, a TFCI field 313, an FBI field 314, and a TPC field 315. The pilot field 312 is used by the cell or cells that receive the UL_DPCH to estimate the up channel environment from the UE to the cell. The TFCI field 313 is a field for transmitting TFCI information of the UL_DPDCH 301 of FIG. 3A. The TFCI field 313 indicates a channel code used for the UL_DPDCH, a transmission rate, information necessary for decoding, or a type of data transmitted through the UL_DPDCH. The feedback information field 314 transmits control information for the closed loop antenna scheme when the downlink transmission scheme from the base station or the cell to the UE uses the closed loop antenna scheme. In addition, when a UE located in a cell overlap region uses a Site Selection Diversity Transmission (hereinafter referred to as "SSDT") to receive DL_DPDCH only from one base station having a good downlink channel environment, it supports SSDT. This field is used to transmit control information. The SSDT is a new technology introduced to HSDPA, which is developed from a function called FCS. The TPC field 315 is a field for transmitting a power control command for controlling transmission power of downlink channels from a base station or a cell. The uplink dedicated channel of FIG. 3A is a channel that all cells in the cell overlap region receive when the UE exists in the cell overlap region. Referring to FIG. 1 as an example, both the cell # 1 101 and the cell # 2 103 receive the UL_DPCH transmitted by the UE 111.

The second uplink dedicated physical control channel (hereinafter, referred to as “S-UL_DPCCH”) of FIG. 3B is a channel for transmitting control information from a UE using HSDPA. As described above, the UE using the HSDPA needs to transmit an ACK or NACK for a packet received from a base station or a cell transmitting the HSDPA, and can transmit channel measurement information for selecting an MCS level or an optimal cell. The above information is transmitted through the S-UL_DPCCH, and only ACK / NACK information 323 may be transmitted during one time slot or three time slot intervals. The channel quality indicator 325 may also be transmitted during one or three time slot intervals. The introduction of the S-UL_DPCCH into the HSDPA is for compatibility with 3GPP communication systems that do not support the conventional HSDPA by introducing a new channel without touching the structure of the conventional UL_DPCH. The S_UL_DPCCH is a channel transmitted only for the cell transmitting the HSDPA, and is transmitted only to the cell or the base station transmitting the HSDPA even if the UE is located in the cell overlap region. Referring to FIG. 1 as an example, the UE 111 transmits S_UL_DPCCH only to cell # 1 101, but does not transmit to cell # 2 103.

In the transmission and reception of the channels described above with reference to FIGS. 2A to 2C and 3A to 3B, a power control method in a conventional cell overlap region uses a power control method in a cell overlap region that is commonly used. have. The power control method in the conventional cell overlap region will be described with reference to FIG. 1 as an example. Cell # 1 101 and cell # 2 103 receive the UL_DPCH transmitted by the UE 111. Thereafter, the cell # 1 101 and the cell # 2 103 analyze the UL_DPCCH from the UL_DPCH to determine whether the received signal exceeds an appropriate value. If the received signal in any one of the cell # 1 101 and the cell # 2 103 exceeds an appropriate value, the cell overlap region due to the excessive transmission power of the UE in the cell where the received signal exceeds the appropriate value In order to suppress the occurrence of interference noise within the transmission of the uplink transmission power control command requesting the UE 111 to lower the uplink transmission power. The basis of whether the cell # 1 101 and the cell # 2 103 increase or decrease the transmit power of the UE 111 with respect to the magnitude of the pilot signal of the UL_DPCCH is transmitted from the base station controller to the base stations. Since the UE 111 receives the DL_DPCH transmitted from the cell # 1 101 and the cell # 2 103 at the same time for the downlink reception signal, if the received signal size of the DL_DPCH exceeds the appropriate line, the UE 111 may receive the downlink signal. A downlink transmit power control command is sent to the cells in the cell overlap region that require the downlink transmit power to be lowered to suppress the occurrence of interference noise. The cell and the UE using the HSDPA for the up / down power control command also transmit HS_PDSCH and S_UL_DPCCH, which are not transmitted to other base stations in the cell overlap region, in the same manner as the transmission power of DL_DPCH and UL_DPCH, respectively.

However, if the above-described power control method in the conventional cell overlap region is used for power control of uplink transmission power of a UE using HSDPA, there are the following problems.

The UL_DPCH transmitted from the UE 111 of FIG. 1 is received in two cells of Cell # 1 101 and Cell # 2 103 and interpreted by the RNC. Accordingly, the UE 111 transmits the UL-DPCH with a value that is typically smaller in the cell overlap region than the uplink transmission power when communicating with only one cell. However, S_UL_DPCCH is information necessary only for cell # 1 101 that transmits HSDPA. Accordingly, since the cell # 2 103 does not receive the S_UL-DPCCH, if the UE 111 transmits the S_UL_DPCCH to the 101 cell # 1 using the transmission power applied to the UL_DPCH as described above, the 101 cell # 1 is The S_UL_DPCCH, which is essential for transmitting HSDPA, may not be interpreted correctly. If the information of the S_UL_DPCCH is not correctly received by the 101 cell # 1, the HSDPA itself may not operate correctly because the HARQ mechanism and the MCS level selection or the optimal cell selection in the FCS cannot operate correctly.

Accordingly, an object of the present invention for solving the above problems is that in the mobile communication system using a code division multiplexing scheme, when two or more channels exist in the reverse direction, transmission power for each channel can be controlled separately. An apparatus and method are provided.

Another object of the present invention is to provide an apparatus and method for separately controlling power of reverse control channels in a mobile communication system supporting downlink high speed packet transmission.

Another object of the present invention is to provide an apparatus and method for power control of reverse channels when a UE receiving the downlink high speed packet transmission is located in a cell overlap region in a mobile communication system supporting downlink high speed packet transmission. have.

Another object of the present invention is to provide an apparatus and method for performing power control by separately generating an uplink transmit power control command for UL_DPCH and an uplink transmit power control command for S_UL_DPCCH.

Another object of the present invention is to provide a power control apparatus and method for changing the signal transmission power of the pilot field of the UL_DPCH.

Another object of the present invention is to provide a power control apparatus and method for separately transmitting an uplink transmit power control command for UL_DPCH and an uplink transmit power control command for S_UL_DPCCH.

Another object of the present invention is to provide a power control apparatus and method for preventing excessive generation of excessive signal interference noise in an overlapping region of an uplink transmission power of S_UL_DPCCH.

It is still another object of the present invention to provide an apparatus and method for separately controlling transmission power of UL_DPCH and S_UP_DPCCH when a UE receiving HSDPA is located in cell overlap.

The present invention according to the first aspect for achieving the above object is characterized in that the terminal uses a pilot field of the UL_DPCCH in generating a TPC for power control of the S_UL_DPCCH in the terminal of the mobile communication system.

The present invention according to the second aspect for achieving the above object is characterized by measuring the pilot field of the UL_DPCH received at the base station of the mobile communication system for the TPC of the UL_DPCCH and the TPC of the S_UL_DPCCH, respectively.

The present invention according to the third aspect for achieving the above object applies an arbitrary threshold value so that the transmission power of S_UL_DPCCH does not cause excessive interference noise in the cell overlap region in the method of determining the uplink transmission power in the terminal of the mobile communication system. It is characterized by.

1 is a diagram illustrating signal transmission and reception between a terminal and a base station in a handover area of a conventional system.

2 illustrates a structure of downlink channels used in a conventional system.

3 is a structure of uplink channels used in a conventional system

4 illustrates an example of a base station transmitter according to the present invention;

5 illustrates an example of a base station receiver according to the present invention;

6 illustrates an example of a terminal transmitter according to the present invention.

7 illustrates an example of a terminal receiver according to the present invention.

8 is a structure of an uplink channel according to the present invention;

9 illustrates a procedure in a base station controller according to an embodiment of the present invention.

10 illustrates a procedure in a terminal controller according to an embodiment of the present invention.

Hereinafter, exemplary embodiments of the present invention will be described in detail with reference to the accompanying drawings.

In the present invention, in performing power control of the forward and reverse dedicated physical control channels for the HSDPA, to maintain compatibility between the existing asynchronous mobile communication terminal and base station that does not support the HSDPA service and the terminal and base station supporting the HSDPA service A method of separately performing power control of reverse dedicated physical control channels is provided. In addition, for the sake of convenience in describing the present invention, the HSDPA in 3GPP, which is a standard of the third generation asynchronous mobile communication method, is described as an example, but other communication systems for simultaneously controlling power of two or more reverse channels. In the present invention can also be applied to the bar proposed.

8 is a slot structure of UL_DPCCH proposed to separately control the transmission power of UL_DPCH and S_UL_DPCCH according to an embodiment of the present invention.

8 shows a radio frame of UL_DPCCH. Time slot #i 811 is a time slot in which UL_DPCCH transmitting a pilot for power control of UL_DPCCH is transmitted, and time slot #j 831 is a time slot in which UL_DPCCH transmitting a pilot for power control of S_UL_DPCCH is transmitted. to be. Although not shown in FIG. 8, it is assumed that UL_DPDCH for transmitting user data and higher layer signaling is transmitted in the structure shown in FIG. The UL_DPCCH transmitted to the timeslot #i 811 is a pilot field 812, a TFCI field 813, an FBI field 814, and a TPC field 815. The role, structure, and operation of the fields are the same as the pilot field 312, the TFCI field 313, the FBI field 314, and the TPC field 315 of FIG. 3. The pilot field 312 is transmitted by determining the transmission power in the same manner as the pilot field transmitted in the conventional UL-DPCCH. The transmission power determination method is a method of transmitting the same transmission power to be applied to all fields of the UL_DPCCH according to the contents of the downlink TPC. Meanwhile, the transmission power of the UL_DPDCH is determined in consideration of the difference between the transmission rates of the UL_DPCCH and the UL_DPDCH. For example, if the spread rate of the channel code of the UL_DPCCH is 256 and the spread rate of the UL_DPDCH is 128, the transmission power of the UL_DPDCH is about 3 dB higher than that of the UL_DPCCH.

The structure of the UL_DPCCH transmitted to the time slot #j 831 is composed of a pilot field 832, a TFCI field 833, an FBI field 834, and a TPC field 835. The roles, operations, and structures of the fields are the same as the pilot field 312, the TFCI field 313, the FBI field 314, and the TPC field 315 of FIG. 3. The UL_DPCCH transmitted to the time slot #j 831 allows the base station receiving the S_UL_DPCCH to generate a TPC command for controlling the transmit power of the S_UL_DPCCH while receiving the UL_DPCCH. The difference between UL_DPCCHs transmitted to the timeslot #i 811 and the timeslot #j 831, respectively, is the difference in the magnitude of the transmit power of the pilot field of each UL_DPCCH. UL_DPCCH for generating a TPC for power control of S_UL_DPCCH in time slot #j 831 is the power offset of FIG. The pilot field 832 is transmitted at the transmission power plus 850. The power offset 850 denotes a difference in transmission power between the S_UL_DPCCH transmission power and the TPC field 835, the TFCI field 833, and the FBI field 834 of the UL_DPCCH. In the prior art, each field of UL_DPCCH was transmitted with the same transmission power. However, in the method proposed in the present invention, since the pilot fields of the UL_DPCCH are transmitted at the transmission power of the S_UL_DPCCH in any of several timeslots of each radio frame of the UL_DPCCH, the transmission power of the S_UL_DPCCH is received at the base station receiving the UL_DPCCH. It is possible to determine a suitable value to generate a TPC for the S_UL_DPCCH.

In FIG. 8, the base station that receives the UL_DPCCH and provides an HSDPA service to a UE transmitting the UL_DPCCH transmits the TPC for UL_DPCH and the TPC for S_UL_DPCCH according to a ratio of the time slot #i 811 and the time. The location of slot #j 831 may be determined. For example, if the ratio of transmitting the TPC for the UL_DPCH and the TPC for the S_UL_DPCCH is 2: 1, the position of the timeslot #i 811 is 0,1,3,4,6,7 of 15 timeslots. The timeslot #j (831) may be the 2,5,8,11,14th timeslot of the 15 timeslots. . The transmission rate of the TPC for the UL_DPCH and the TPC for the S_UL_DPCCH may be a power control ratio of the UL_DPCH and the S_UL_DPCCH.

Accordingly, the power control ratio is information to be provided from the base station to the UEs, and three methods may be proposed to provide the same to the UEs. In a first method, the power control ratio is transmitted to all UEs in the base station through a common channel for transmitting system information in the base station. For example, the common channel may be a primary common control physical channel (hereinafter, referred to as "P-CCPCH") in which a broadcast channel is transmitted. This is to allow UEs receiving the HSDPA service to perform power control of the UL_DPCH and the S_UL_DPCCH with a common value. In the second method, the power control ratio may be received by the UE that intends to use the HSDPA in the call setup step with the base station supporting the HSDPA. The third method is a value that the base station transmitting the HSDPA can transmit to the UE when the UE intending to use the HSDPA enters a cell overlap region.

In addition to the above three methods of informing the power control ratio through higher layer signaling information between the base station transmitting the HSDPA and the UE receiving the HSDPA, a pilot field for generating a TPC of the UL_DPCH and a TPC of the S_UL_DPCCH are generated. The pattern of the pilot field can be used differently. If the pilot field is used differently as described above, the TPC for UL_DPCH and the TPC for S_UL_DPCCH can be generated separately without higher layer signaling. That is, the base station receiving the pilot field may generate and transmit the TPC for UL_DPCH and the TPC for S_UL_DPCCH according to the pattern used for the pilot field.

4 is a diagram illustrating a configuration of a base station transmitter in a code division multiple access mobile communication system according to an embodiment of the present invention.

Referring to FIG. 4, the controller 401 inputs a channel estimation result 451 of the pilot field of the UL_DPCCH received through the base station receiver. The controller 401 generates a TPC command to be applied to the UL_DPCCH if the pilot field of the UL_DPCCH is transmitted at the transmission power of the UL_DPCH and is received at the base station receiver. In addition, the controller 401 generates a TPC command to be applied to the S_UL_DPCCH if the pilot field of the UL_DPCCH is transmitted at the transmission power of the S_UL_DPCCH and is received at the base station receiver. The controller 401 inputs the TPC command applied to the UL_DPCH or the TPC command applied to the S_UL_DPCCH to the multiplexer 420 at a suitable time.

In the method of determining the transmission time of the TPC command of the UL_DPCH and the T_command of the S_UL_DPCCH, the controller 401 may consider various matters as follows. First, the data rate, channel condition, signal size and importance of the UL_DPDCH transmitted by the UE. Second, the channel status and signal size of the S_UL_DPCCH, and third, the power control ratio of the UL_DPCH and S_UL_DPCCH and the transmission length of the S_UL_DPCCH. In the present invention, for convenience of description, it is assumed in FIGS. 4 to 7 that the TPC command for S_UL_DPCCH is transmitted once after the TPC command for UL_DPCH is transmitted twice. However, the transmission rate of the TPC command for the UL_DPCH and the transmission rate of the TPC command for S_UL_DPCCH may be adjusted according to circumstances. In addition, the adjustment ratio may be transmitted to the UE through an upper layer signaling message or a physical channel control message, or may be changed by an advance appointment between the base station and the UE.

The multiplexer 420 plays a role of configuring a DL_DPCH, and inputs a TPC 402, a pilot 403, and a TFCI 404 as inputs to configure a DL_DPCCH, and 411 user data or higher signaling control information is 412. After convolutional coding or turbo coding through an encoder, the DL-DPDCH is configured by using the output signal after being processed into a form suitable for transmission through a physical channel in the 413 rate matching unit. The 413 rate matching unit performs a process of repetition or puncturing the data in order to process the transmission data into a form suitable for a physical channel. Perforation is used if the length of the data is longer than the length that can be transmitted on the physical channel, and repetition is used if the length of the data is shorter than the length that can be transmitted on the physical channel.

The DL_DPCH output from the multiplexer 420 is modulated by a suitable modulation method in the modulator 470 and then provided to the spreader 421. The DL_DPCH is channel spread by the spreader 421 to the channel code used for the DL_DPCH, and the channel spread DL_DPCH is multiplied by the channel gain value applied to the transmit power of the DL_DPCH in the multiplier 422 to add up to a totalizer. 460). The DL_DPCH multiplied by the channel gain is summed by the summer 460 with other downlink transmission channels. The channel gain value applied to the transmission power of the DL_DPCH may be set in consideration of the transmission rate of the DL_DPCH and a TPC command received in an uplink channel.

The I-th user's data 431 to be transmitted through the HS_PDSCH is encoded by an appropriate predetermined channel encoding method in the encoder 412 and then processed into a form suitable for transmission on the physical channel by the rate matching unit 413. The data processed and output from the rate matching unit 413 is modulated by a suitable modulation method in the modulator 471, and then channel spread in the spreader 434, and multiplied by an appropriate channel gain in the multiplier 435, and then summed. The input signal 460 is added to other downlink channels. The combination of modulation methods used in the encoder 432 and modulator 471 can be the MCS level described above. In the spreader 434, the number of channel codes may be several as described above, and the speed of downlink data transmission may be increased by using the plurality of channel codes.

The TFRI information 441 is information indicating a channel code used for the HS_PDSCH, an MCS level, and values applied to the HS-DSCH in the rate matching unit 433. The UE correctly interprets the HS-DSCH by receiving the TFRI information. can do. The HARQ information 442 is information that indicates to the UE whether the packet transmitted through the HS_PDSCH is the initial transmission packet or the retransmission packet. The information on the nature of the packet transmitted to the currently received HS-PDSCH through the information These can be identified and used for each appropriate purpose. In the case of a packet that has been retransmitted, the appropriate purpose may be reproduced as an appropriate signal in combination with a packet in which a previously received error occurs.

The TFRI information 441 and the HARQ information 442 are encoded in an appropriate manner through the encoder 443 and the encoder 444, respectively, and are input to the multiplexer 445. The TFRI information 441 and the HARQ information 442 may be transmitted in the form of simple information or may be transmitted in a separate encoding method to increase reliability. It may also be transmitted repeatedly. The multiplexer 445 configures SHCCH by using the outputs of the encoder 443 and the encoder 444, and outputs the configured SHCCH. The signal output from the multiplexer 445 is modulated in a suitable manner by the modulator 472 and then input to the spreader 446 to be spread with the channel code for the SHCCH. The SHCCH spread with the predetermined channel code is multiplied by the channel gain for the SHCCH in the multiplier 447 and then input to the summer 460.

The summer 460 sums up the DL_DPCH, the HS-PDSCH, the SHCCH, and downlink common channels for transmitting control signals of a base station and channels of other users not described in FIG. 4. Since the channel codes are multiplied so that the downlink channels can be distinguished from each other, the UE can properly interpret only signals received from the UE. The signals output from the summer 460 are mixed with the scrambling code used by the base station in the multiplier 461, and then the signals are raised in the carrier band by the RF unit 463 and then transmitted to the UE through the antenna 464. . The scrambling code used in the multiplier 461 is used to distinguish the downlink signal between each base station or cells.

5 is an example of a base station receiver according to the present invention.

The signal of the UE received through the 501 antenna of FIG. 5 is converted to baseband in the 502 RF unit, and then de-mixed using the scrambling code used by the UE in the multiplier 504 again. The scrambling code used by the UE serves to distinguish signals between a plurality of UEs received by the base station. Signals of the UE output from the 504 multiplier are input to 510 despreader, 520 despreader, and 530 despreader, respectively, and are classified into UL_DPCCH, UL_DPDCH, and S_UL_DPCCH. The 510 despreader, the 520 despreader, and the 530 despreader multiply the channel codes used for the UL_DPCCH, UL_DPDCH, and S_UL_DPCCH, respectively, to perform the despreading process. After the UL_DPCCH output from the 510 despreader is demodulated by the demodulator 560, only 512 pilot fields are separated from the demultiplexer 511, input to the channel estimator 513, and used to estimate an up channel environment from the UE to the base station. After the size of the pilot signal is estimated, the base station uses the size of the pilot signal to generate a TPC command for power control of UL_DPCH. The UL_DPCCH input to the multiplier 514 is corrected by the channel estimate estimated by the channel estimator 513 and input to the 515 demultiplexer to be demultiplexed into 516 TPC, 517 TFCI, and 518 FBI.

The UL_DPDCH output from the despreader 520 of FIG. 5 is demodulated in a 561 demodulator, corrected using a channel estimate value of a 513 channel estimator in a 521 multiplier, and then reverse-matched in a 522 reverse rate matching unit, and then a 523 decoder. It is inputted as and recovered to the I-th user data or higher layer signaling message. The operation of the 522 reverse rate matching unit means that the data is restored to the original data by reversing a puncturing or repetition process in a rate matching process in a transmitter of the UE, and the puncturing or repetition is performed. The position of the data symbols is a value previously promised between the UE transmitting the UL_DPDCH and the base station receiving the UL_DPDCH.

The S-UL_DPCCH output from the despreader 530 of FIG. 5 is demodulated by a 562 demodulator, input to a 533 multiplier, and channel compensated by the channel estimate of the 513 channel estimator.

The channel-compensated S-UL-DPCCH in the 533 multiplier of FIG. 4 is input to the 535 demultiplexer, separated into an ACK / NACK and a channel report message (hereinafter referred to as a CQI), and then the 536 decoder and It is input to the 538 decoder and recovered to 537 CQI and ACK / NACK. The 536 decoder and the 538 decoder are defined as decoders having a decoding function for code and repetitive transmission in the same manner used by the UE.

The controller 550 of FIG. 5 receives a signal estimation result of the pilot field of the UL-DPCCH estimated by the channel estimator 513 and generates a TPC command suitable for each channel. The pilot field of the UL_DPCCH input to the controller 550 is used to generate a TPC for UL_DPCH or a TPC for S_UL_DPCCH, respectively, according to the transmission power of the pilot field. That is, if the pilot field of the UL_DPCCH is transmitted as transmitted in 811 timeslot #i of FIG. 8, it is used to generate a TPC for UL_DPCH, and the pilot field of the UL_DPCCH is transmitted in 831 timeslot #j of FIG. 8. If sent as is used to generate a TPC for S_UL_DPCCH.

6 is an example of a terminal transmitter for the base station receiver of FIG. 4, and is an example of a UE transmitter located in the same situation as that of FIG. 1.

The controller 601 of FIG. 6 generates a 651 channel gain applied to the UL-DPCH, a 670 channel gain applied to the 611 pilot of the UL-DPCCH, and a 652 channel gain applied to the S-UL-DPCCH, thereby generating UL_DPCH and S_UL_DPCCH. It is responsible for controlling the uplink transmission power. The controller 601 receives a plurality of TPCs transmitted from a base station. TPC for S-UL-DPCCH and TPC for Ul-DPCH are used to generate 670 channel gain, 652 channel gain, and 651 channel gain, respectively. The 652 channel gain of FIG. 6 can be directly determined using the TPC for S_UL_DPCCH received by the base station transmitting the HSDPA, and the channel gain to which the received TPC is applied is too high and is generated by the S-UL-DPCCH in the cell overlap region. If the amount of the interference signal for the other signal is too large, it may be determined as a specific threshold value. The specific threshold may be determined by the ratio of the relative transmit power to the UL-DPCH, and may also be determined by the magnitude of the absolute transmit power. The ratio of the relative transmission power or absolute transmission power relative to the UL-DPCH may be transmitted from the base station to the UE using higher layer signaling or a physical layer signal, and may be a value previously promised and used by the base station and the UE. Can be.

The 651 channel gain of FIG. 6 is a channel gain applied to UL_DPCCH, and may be determined by receiving the TPC for UL_DPCCH. The channel gain applied to the 635 multiplier of FIG. 6 is added or subtracted from a predetermined value with respect to the 651 channel gain. Value. The predetermined value may be determined by a difference between spreading rates according to a channel code of UL_DPCCH and a channel code of UL_DPDCH.

The 670 channel gain of FIG. 6 is determined by the controller 601. The 670 channel gain is 1 when the controller 601 transmits a pilot signal of UL_DPCCH to generate a TPC for UL_DPCH, and generates a pilot signal of UL_DPCCH to generate a TPC for S_UL_DPCCH. In the case of transmission, it may be defined as the difference between the channel gain 652 and the channel gain 651 of FIG. 6. The 611 pilot to which the channel gain 670 is applied is multiplied by the channel gain 651 for the UL_DPCCH in the multiplier 617 of FIG. 6 and transmitted to the base station transmitting the S_UL_DPCCH at the same transmit power as the channel gain 652 of FIG. 6.

The 615 multiplexer of FIG. 6 configures a UL-DPCCH by receiving 612 TPC, 611 pilot, 613 TFCI, and 614 FBI as inputs for controlling downlink transmission power. The Ul-DPCCH output from the 615 multiplexer is modulated in a suitable manner in the 660 modulator, then spread to the channel code applied to the Ul-DPCCH in the 616 spreader, and then multiplied by the 651 channel gain in the 617 multiplier and input to the summer 640. do.

The 631 user data or higher layer signaling information of FIG. 6 is encoded by an appropriate code in the 632 encoder, and then processed to be suitable for the physical channel transmission form in the 633 rate matching unit. The signal output from the 633 rate matching unit is input to the 661 modulator, modulated by a suitable modulation scheme, and then input to the 634 spreader to become UL_DPDCH. The UL_DPDCH output from the 634 spreader is multiplied by the channel gain for the UL-DPDCH in the 635 multiplier and then input to the summer 640. The channel gain applied in the 635 multiplier may be determined by the difference in transmission rates between Ul_DPCCH and UL_DPDCH with respect to the channel gain applied in the 617 multiplier.

The multiplexer 627 of FIG. 6 configures S-Ul-DPCCH by receiving 625 ACK / NACK, which is control information for N-channel HARQ, as a value encoded by the 626 encoder and 623 CQI as a value encoded by the 624 encoder. . The S-UL_DPCCH output from the multiplexer 627 is modulated in a suitable manner in the 662 modulator and then spread in the 628 spreader. The S_UL_DPCCH spread in the 628 spreader is multiplied by the channel gain 652 in the multiplier 629 and input to the 640 summer.

The summer 640 sums up the input upstream signals and outputs the summed up signals to the 641 multiplier. Since the uplink signals added by the 640 summer can be distinguished by different channel codes, the base station receiving the signals can reproduce appropriate signals. In the 641 multiplier, an uplink scrambling code used by a UE performs a mixing process that can distinguish uplink signals from the UE from uplink signals of other UEs. The signals output from the 641 multiplier are input to the 643 RF unit, become a signal of a carrier band, and then transmitted to the base station through the 644 antenna.

7 is an example of a UE receiver for the situation of FIG. 1 as an example of a UE receiver for the base station transmitter of FIG.

The downlink signal received through the 701 antenna of FIG. 7 is converted into a baseband signal by the 702 RF unit and then input to the 704 multiplier. The 704 multiplier performs a demixing process on the downlink signals using the same downlink scrambling code used at the base station. The demixed downlink signals are input to the 710 despreader, 730 despreader, 740 despreader, and 750 despreader of FIG. 7, respectively, to receive DL_DPCH, HS-PDSCH, and SHCCH from other base stations that do not transmit DL_DPCH, HS-DSCH. Separated by.

The DL_DPCH of the base station transmitting the HS-DSCH output from the 710 despreader is input to the demodulator 770, demodulated, and then input to the demultiplexer 711 to be separated from the 721 TPC. The DL_DPCH of the base station which does not transmit the HS-DSCH output to the 730 despreader is demodulated by the demodulator 771 and then input to the demultiplexer 731 to be separated from the 723 TPC. The 721 TPC and the 723 TPC are input to the controller 760 of FIG. 7 and used to determine uplink transmission power of the UL_DPCH and the S-UL-DPCCH of the UE.

The outputs of the 711 demultiplexer and the 731 demultiplexer of FIG. 7 are input to the summer 712 and summed. The summed signals are input to a 770 demultiplexer so that only 771 pilots are distinguished and input to a 720 channel estimator. The channel estimation result of the 771 pilot signals input to the 720 channel estimator is input to the controller 760 and used to generate a TPC command for controlling downlink transmission power of base stations communicating with the UE. The channel estimation result of the 720 channel estimator is input to the 713 multiplier and used for channel compensation of the DL_DPCH output from the 712 summer. The DL_DPDCH output from the 715 demultiplexer is derate matched in the 718 derate rate matching unit and then input to the 719 decoder. The reversed-matched DL_DPDCH is decoded in the 719 decoder and then restored to 720 user data or higher layer signaling information.

The HS_PDSCH output from the despreader 740 of FIG. 7 is input to the 772 demodulator, demodulated, input to the 741 multiplier, and channel compensated for the channel estimation result of the 720 channel estimator, and then output to the 742 decoder. The HS-DSCH output from the 741 multiplier is reverse-lay matched by the 742 reverse ray matching unit and then decoded by the 743 decoder, and then returned to user data. In the present invention, a detailed N-Channel SAW HARQ is not described for convenience of description, but the HS-DSCH decoded through the 743 decoder process may be used for the operation of the N-channel SAW HARQ as described above.

The SHCCH output from the 750 despreader of FIG. 7 is channel compensated by the channel estimation result output from the 720 channel estimator in the 751 multiplier. The channel compensated SHCCH in the 751 multiplier of FIG. 7 is input to a 752 demultiplexer and separated into TFRI information and HARQ information, and the TFRI information and HARQ information are separated into 755TFRI information and 756 HARQ information through a 753 decoder and a 754 decoder, respectively. And then used for each purpose.

The controller 760 of FIG. 7 receives a signal estimation result of all TPCs and a pilot field of DL_DPCCH received by the UE to determine the uplink transmission power of the UL-DPCH and the uplink transmission power of the S-DL-DPCCH. . If the TPC command transmitted from the base station transmitting the HSDPA to the UE using the receiver of FIG. 7 was for the UL-DPCCH, the transmission power of the UL-DPCH may be determined including the TPC command, and after receiving the TPC command, If the TPC command for the S-UL-DPCCH is not received at the time of transmission of the UL-DPCCH, the transmission power of the S-UL_DPCCH to be transmitted currently may be determined using the transmission power of the S_UL_DPCCH used immediately before. The transmit power of the S-UL-DPCCH may be determined by applying a constant power offset to the transmit power of the -DPCH. In addition, if the TPC transmitted from the base station transmitting the HSDPA is a TPC for the S-UL-DPCCH, the transmission power of the UL-DPCH is determined using other TPC commands in a situation other than the TPC, and the TPC of the S-UL-DPCCH The transmit power can be determined using the TPC for the S-UL_DPCCH.

An example of an operation flowchart of a base station controller and an example of a terminal controller operation flowchart of the reverse power control method according to the present invention are shown in FIGS. 9 and 10, respectively, and assume the situation of FIG. 1 for convenience of description of the present invention. Will be explained.

9 is an example of a base station controller algorithm according to the present invention.

In 900 of FIG. 9, the base station determines whether a UE receiving an HS-DSCH from the base station is in a cell overlap region. The determination of whether the UE is in the cell overlap area is to allow the UE to communicate with other base stations in the cell overlap area after receiving information about the size of signals of other base stations measured by the UE. Since it is controlled by the base station, it can be sufficiently determined by the base station. In 901 of FIG. 9, the base station receives the UL_DPCH from the UE and receives the TPC transmitted through the pilot field and the UL_DPCCH in the UL_DPCCH of the UL_DPCH. In 901, when the base station receives the UL_DPCCH from the reverse direction, the structure of the UL-DPCCH when the UE is located in the cell overlap region and when the UE is not located in the cell overlap region may be different. That is, when the UE is not located in the cell overlap region, the base station transmitting and receiving with the UE is only one base station transmitting the HS-DSCH, so that the UE can control the UL-DPCCH to control the transmission power of the S-UL-DPCCH. There is no need to change the transmit power of the pilot field. Accordingly, when the UE is not located in the cell overlap region, the UL-DPCCH may be configured to be formed in timeslot #i shown in FIG. 8 of the present invention. In the description of FIG. 9, the UE is located in the cell overlap region. Since it is assumed to be located, UL_DPCCH used for timeslot #i and timeslot #j of FIG. 8 are alternately used.

In step 902 of FIG. 9, the base station generates a TPC command to be transmitted downward using the pilot field received in step 901. In step 903 of FIG. 9, the base station determines whether the pilot field received in step 901 is for S_UL_DPCCH or UL_DPCH. When the pilot field is determined to be for UL_DPCH, the base station generates a TPC command to be applied to UL_DPCH in step 911. If the received pilot field is determined for the S_UL_DPCCH, a TPC command to be applied to the S_UL_DPCCH is generated at 904.

In 905 of FIG. 9, the downlink transmission power is determined according to the forward power control command received at 901, and then the TPC command determined at 911 or 904 is transmitted together with other downlink signals transmitted from the base station to the UE.

In step 906 of FIG. 9, it is determined whether the UE communicating with the base station is out of the cell overlap region or whether the transmission of the HS-DSCH to the UE is completed. If the out of or the HS-DSCH transmission to the UE is completed, the reverse transmission power of the UE is controlled at 907 through a normal power control algorithm that controls only the reverse transmission power of the UL-DPCH, and otherwise repeats from 901.

FIG. 10 is a flowchart illustrating an operation of the terminal controller of FIG. 9.

In 1001 of FIG. 10, the UE determines whether a TPC command received from a base station is for UL_DPCH or S_UL_DPCCH. If the TPC received at 1001 is for the UL_DPCH, a determination is made at 1011 to determine whether the content of the received TPC is to increase or decrease the transmit power of the UL_DPCH and determine the transmission power to be applied to the UL_DPCH in 1012 of FIG. In 1013 of FIG. 10, the transmission power for the S_UL_DPCCH is determined. The transmission power for the S_UL_DPCCH may be used as the transmission power of the S_UL_DPCCH to be transmitted at this time by using the transmission power of the S_UL_DPCCH transmitted immediately before the transmission of the S_UL_DPCCH. And The transmission power of S_UL_DPCCH may be determined according to the TPC for UL_DPCH. There may be various criteria for determining transmission power of S_UL_DPCCH according to the TPC for UL_DPCH. For example, the following criteria may be used. If the received TPC for UL_DPCH indicates a higher transmit power, the transmit power of S_UL_DPCCH is increased, and if the received UL_DPCH TPC indicates a lower transmit power, the transmit power of the S_UL_DPCCH is transmitted just before the time of transmitting the S_UL_DPCCH. The transmission power of S_UL_DPCCH may be used as it is and transmitted. In the description of FIG. 10, a criterion is that the transmission power of S_UL_DPCCH is changed only when the TPC for S_UL_DPCCH is received. The UE that determines the transmit power of S_UL_DPCCH at 1013 transmits UL_DPCH and S_UL_DPCCH at the determined transmit power at 1008, and at 1009, whether the UE is out of the cell overlap region or the UE is located in the cell overlap region but is no longer to be received If it is determined whether there is no DSCH, and it is determined that there is no HS-DSCH out of the cell overlap region or no longer to be received, the normal power control algorithm for the forward dedicated channel and the reverse dedicated channel is performed at 1010, and 1009. If the soft handover is not terminated or if there is more HS-DSCH to receive in the cell overlap region, the process is repeated from step 1001. In addition, whether the UE is out of the cell overlap region or the reception of the HS_DSCH is finished at 1009 may be determined by higher layer signaling from the base station to which the UE receives the HSDPA service.

If it is determined that the TPC for S_UL_DPCCH has been received in 1001 of FIG. 10, the TPC for S_UL_DPCCH and UL_DPCCH transmitted from another base station are separately analyzed in 1002. According to the TPC example for S_UL_DPCCH and UL_DPCCH analyzed in 1002, the transmission power for S_UL_DPCCH and UL_DPCH are determined in 1003, and in 1004, it is determined whether the transmission power of S_UL_DPCCH determined in 1003 exceeds a threshold value. do. The threshold applied at 1004 may be used to prevent excessive transmission noise of S_UL_DPCCH, causing excessive interference noise to other UEs or base stations in a cell overlap region, and the threshold may be used for the transmission power of UL_DPCH. It may be a relative transmit power value of S_UL_DPCCH or may be given as an absolute value. If the threshold value is determined as the transmission power value of S_UL_DPCCH relative to the transmission power of UL_DPCH, the matter that can be considered in the determination of the threshold value may be the number of base stations in the cell overlap region. That is, if the number of base stations in the cell overlap region is large, the transmission power of UL_DPCH will be relatively small. Therefore, the threshold value applied to the transmit power of S_UL_DPCCH can be increased. If the number of base stations in the cell overlap region is relatively small, Since the transmit power can be increased, the threshold to be applied to the transmit power of S_UL_DPCCH can be made smaller. The threshold is a value that can inform the UE in the same manner as the signaling method for the power control rate of the UL_DPCH and S_UL_DPCCH described in FIG. 8.

If it is determined that the transmission power threshold of S_UL_DPCCH is exceeded in 1004 of FIG. 10, after determining the transmission power of S_UL_DPCCH by applying the threshold for S_UL_DPCCH in 1005, it is determined whether the pilot time for the TPC of S_UL_DPCCH in 1006. If it is determined in step 1004 that the threshold of the transmit power of the S_UL_DPCCH is not exceeded, it is determined in step 1006 whether it is the TPC pilot time of the S_UL_DPCCH. If it is determined that the S_UL_DPCCH is the TPC pilot transmission time in 1006, the pilot field transmission power of the UL_DPCCH is determined in consideration of the transmission power of the determined S_UL_DPCCH in 1007, and UL_DPCH, the transmission power determined in the 1003, 1005 and 1007 in 1008. The pilot fields of S_UL_DPCCH and UL_DPCCH are transmitted. In step 1006, it is not determined that the S_UL_DPCCH is a TPC pilot transmission time, and in 1008, UL_DPCH and S_UL_DPCCH are transmitted using the transmission power determined in 1003 or 1005.

10, the UE transmitting the UL_DPCH and the S_UL_DPCCH in 1008 of FIG. 10 determines whether the UE is out of the cell overlap region or whether the UE is located in the cell overlap region but no further HS-DSCH is received. In step 1010, if it is determined that the HS-DSCH is out of the cell overlap region or there is no more reception, the normal power control algorithm for the forward dedicated channel and the reverse dedicated channel is performed and the soft handover is not terminated at 1009. Otherwise, if there is more HS-DSCH to be received in the cell overlap region, the process is repeated from step 1001. In addition, whether the UE is out of the cell overlap region or the reception of the HS_DSCH is finished at 1009 may be determined by higher layer signaling from the base station to which the UE receives the HSDPA service.

According to the present invention, in the reverse power control method of a base station and a mobile station communicating using HSDPA, uplink dedicated physical channel for downlink dedicated channel and second uplink dedicated physical control channel for transmitting uplink control information of HSDPA are transmitted. The present invention provides an apparatus and a method for correctly receiving the secondary uplink dedicated physical control channel at a base station receiving a secondary uplink dedicated physical control channel, and further, the uplink dedicated physical channel and the secondary uplink dedicated physical control. In the method for separately controlling power of a channel, a method of changing transmission power of a pilot field of a primary uplink dedicated physical control channel is introduced, and the base station performs power control commands for the uplink dedicated physical channel and the secondary uplink dedicated physical control channel. Devices that can create a separate Presented the way.

Claims (5)

A transmission corresponding to the uplink dedicated physical channel at a base station to control transmission power control of an uplink dedicated physical channel and a second uplink dedicated physical control channel from a mobile terminal located in a cell overlap region serviced by at least two base stations A method of transmitting a power control command and a transmission power control command corresponding to the second uplink dedicated physical control channel to the mobile terminal, the method comprising: Receiving an uplink dedicated physical control channel from the mobile terminal, receiving a pilot field and a transmission power control command of the uplink dedicated physical control channel; Interpreting the received pilot field and determining whether the interpreted pilot field corresponds to the second uplink dedicated physical control channel; Generating a transmission power control command to be applied to the second uplink dedicated physical control channel when it is determined that the pilot field corresponds to the second uplink dedicated physical control channel; Generating a transmission power command to be applied to the uplink dedicated physical channel if it is determined that the pilot field corresponds to the second uplink dedicated physical control channel; And determining downlink transmission power according to the transmission power control command received from the mobile terminal and transmitting the generated transmission power command to the mobile terminal. In a mobile terminal located in a cell contiguous area serviced by at least two base stations, a transmit power control command for a second uplink dedicated physical control channel from the at least two base stations and a transmit power command for an uplink dedicated physical channel. In the method for controlling each of the transmission power of the second uplink dedicated physical control channel and the uplink dedicated physical channel, When the transmit power command for the uplink dedicated physical channel is received, the transmit power command is interpreted to determine the transmit power of the uplink dedicated physical channel, and the second uplink dedicated physical control is performed by the determined transmit power of the uplink dedicated physical channel. A first process of determining transmission power of a channel; When the transmission power control command for the second uplink dedicated physical control channel is received from each of the at least two base stations, the signal is separated and interpreted, and then the transmission power of the second uplink dedicated physical control channel and the transmission power of the uplink dedicated physical channel are analyzed. The second process of determining If the transmission power of the second uplink dedicated physical control channel determined in the second step exceeds a predetermined threshold, the transmission power of the second uplink dedicated physical control channel is applied by applying a threshold value for the second uplink dedicated physical control channel. The third process of determining, The transmission power of the uplink dedicated physical control channel is determined in consideration of the transmission power of the second uplink dedicated physical control channel determined in the second process or the third process at the time of pilot transmission time for controlling the transmission power of the second uplink dedicated physical control channel. Determining and transmitting the second uplink dedicated physical control channel and uplink dedicated physical channel to the base station at the determined transmission power; When the pilot power for the transmission power control of the second uplink dedicated physical control channel is not at the time of pilot transmission, the base station selects the second uplink dedicated physical control channel and the uplink dedicated physical channel by the transmission power determined in the second process or the third process. The method comprising the step of transmitting to. Transmission of the uplink dedicated physical control channel and the second uplink dedicated physical control channel from the mobile station by a base station of a code division multiple access mobile communication system providing a high speed data packet access service to a mobile terminal transmitting an uplink dedicated physical control channel. In the method for transmitting a power control command, Generating a transmission power control command of the uplink dedicated physical control channel and a transmission power control command of the second uplink dedicated physical control channel according to a predetermined power control ratio, and transmitting the generated command to the mobile terminal; A time slot in which the uplink dedicated physical control channel is transmitted from the mobile station by the predetermined power control ratio among 15 time slots constituting a transmission frame from the base station to the mobile station and the second uplink dedicated physical control channel. Determining the timeslot to be transmitted. The method of claim 3, The transmission power control command of the uplink dedicated physical control channel transmitted to the mobile terminal by the predetermined power control ratio is 2: 1 when the ratio of the transmission power control command of the second uplink dedicated physical control channel is 2: 1. And a timeslot in which an uplink dedicated physical control channel is transmitted is determined as 0th, 1st, 3rd, 4th, 6th, 7th, 9th, 10th, 12th, 13th time slots of the 15 timeslots. The method of claim 3, The transmission power control command of the uplink dedicated physical control channel transmitted to the mobile terminal by the predetermined power control ratio is 2: 1 when the ratio of the transmission power control command of the second uplink dedicated physical control channel is 2: 1. And a timeslot in which the second uplink dedicated physical control channel is transmitted is determined as the 2nd, 5th, 8th, 11th, and 14th time slots of the 15 time slots.