KR100827087B1 - Method and apparatus for transmission power control for user equipment in cdma mobile communication system - Google Patents

Abstract

The present invention relates to an apparatus and method for uplink power control in a communication system using a channel for High Speed Downlink Packet Access (hereinafter referred to as HSDPA) in a mobile communication system using CDMA. The advantage of the scheme proposed in the present invention is that the control channel for the downlink high-speed transmission and the control for the other channels and power control of the data channel can be performed together.

HSDSCH, DPDCH, P-DPCCH, S-DPCCH, TTI

Description

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

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.

The present invention relates to an apparatus and a method for controlling uplink 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 an uplink dedicated physical channel for the present invention.

In general, a high speed downlink packet access method (hereinafter referred to as "HSDPA") is a downlink data channel for supporting downlink 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 downlink 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 downlink data channel according to a channel state between a base station or a cell and a terminal or 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 scheme and the coding scheme is referred to as 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 method, an acknowledgment (ACK) or a non-acknowledgement signal (NACK.) Is exchanged with a retransmission packet 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 Wait ARQ scheme, after receiving one packet, an ACK or a NACK was received, and then another packet was 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 downlink control information and downlink data and uplink control information and uplink 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 a structure of channels transmitted downward in FIGS. 2A to 2C, and a diagram of a structure of channels transmitted upward in FIG. 1 is FIGS. 3A to 3B.

2A to 2C illustrate a structure of channels transmitted downward to a UE using HSDPA, and FIGS. 3A to 3B illustrate a structure of channels transmitted upward 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, and 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 one time slot having a length of 2560 chips. The time slots are gathered together to form one radio frame having a length of 10 ms. 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 (UL). 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 periods. The channel quality indicator 325 may also be transmitted during one or three time slot periods. 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 and 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 transmit the HS_PDSCH and the 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 the DL_DPCH and the 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 transmits the HSDPA. The S_UL_DPCCH, which is essential for transmission, 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.

An object of the present invention for solving the above problems is an apparatus capable of separately controlling the transmission power for each channel, when there are two or more channels in the upstream in a mobile communication system using a code division multiplexing method; In providing a method.

Another object of the present invention is to provide an apparatus and method for power control of uplink control channels separately 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 uplink 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.

It is still another object of the present invention to provide a power control apparatus and method for preventing excessive generation of 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.

According to an embodiment of the present invention, the base station to control the transmission power control of the uplink dedicated physical channel and the second uplink dedicated physical control channel for the terminal located in the cell overlap area serviced by at least two base stations. A method for transmitting a transmit power control command corresponding to a dedicated physical channel and a transmit power control command corresponding to the second uplink dedicated physical control channel to the terminal, the method comprising: uplink dedicated physical from the uplink dedicated physical channel received from the terminal; Receiving a pilot field of a control channel, analyzing the received pilot field to determine whether the pilot field corresponds to the second uplink dedicated physical control channel, and If it is determined that the corresponding pilot field, the transmission power control command to be applied to the second uplink dedicated physical control channel Generating a transmission power control command to be applied to the uplink dedicated physical channel; and determining the transmission field to be applied to the uplink dedicated physical channel. And transmitting power control commands to the terminal.
In addition, according to an embodiment of the present invention, a terminal located in a cell overlap area serviced by at least two base stations, and transmit power control command for a second uplink dedicated physical control channel received from the at least two base stations; A method of controlling the transmit power of the second uplink dedicated physical control channel and the uplink dedicated physical channel according to a transmit power command for an uplink dedicated physical channel, wherein when a transmit power control command for the uplink dedicated physical channel is received, Interpreting the transmission power control command to determine transmission power of the uplink dedicated physical channel, and determining transmission power of the second uplink dedicated physical control channel according to the determined transmission power of the uplink dedicated physical channel; Transmit power control command for the second uplink dedicated physical control channel from each of the at least two base stations Receiving a second transmission power control command for the second uplink dedicated physical control channel, the second power for determining the transmission power of the second uplink dedicated physical control channel and the transmission power of the uplink dedicated physical channel, respectively; A third step of determining the transmission power of the second uplink dedicated physical control channel as the threshold value when the transmission power of the second uplink dedicated physical control channel determined in the second step exceeds a predetermined threshold value; At the time of pilot transmission for controlling the transmit power of the 2-uplink dedicated physical control channel, the transmit power of the uplink dedicated physical channel is determined according to the transmit power of the second uplink dedicated physical control channel determined in the second process or the third process, Transmitting the second uplink dedicated physical control channel and the uplink dedicated physical channel to the base station, respectively, at the determined transmission power; At a time other than the pilot transmission time for controlling the transmit power of the control channel, the transmit power of the uplink dedicated physical channel determined in the first process and the transmit power of the second uplink dedicated physical control channel determined in the second process or the third process are determined. Accordingly, the method includes transmitting the second uplink dedicated physical control channel and the uplink dedicated physical channel to a base station, respectively.
In addition, according to an embodiment of the present invention, in order to control the transmission power control of the uplink dedicated physical channel and the second uplink dedicated physical control channel for the terminal located in the cell overlap area serviced by at least two base stations, A base station apparatus for transmitting a transmit power control command corresponding to a dedicated physical channel and a transmit power control command corresponding to the second uplink dedicated physical control channel to the terminal, the base station apparatus comprising: receiving from the uplink dedicated physical channel received from the terminal; Analyze a pilot field of an uplink dedicated physical control channel, determine whether the pilot field corresponds to the second uplink dedicated physical control channel, and if it is determined that the pilot field corresponds to the second uplink dedicated physical control channel, Generate a transmit power control command to be applied to a 2-up dedicated physical control channel, and And a controller for generating a transmission power control command to be applied to the uplink dedicated physical channel if it is determined that the pilot field does not correspond to a null and transmitting the generated transmission power control commands to the terminal at a predetermined transmission time. Shall be done.
In addition, according to an embodiment of the present invention, located in a cell overlap area serviced by at least two base stations, and transmit power control command and uplink dedicated for the second uplink dedicated physical control channel received from the at least two base stations In the terminal device for controlling the transmission power of the second uplink dedicated physical control channel and the uplink dedicated physical channel according to the transmission power command for a physical channel, when the transmission power control command for the uplink dedicated physical channel is received, Interpret a transmit power control command to determine a transmit power of the uplink dedicated physical channel, and determine a transmit power of the second uplink dedicated physical control channel according to the determined transmit power of the uplink dedicated physical channel; And transmit power for the second uplink dedicated physical control channel from each of the at least two base stations. When the commands are received, a second process of determining transmit power of the second uplink dedicated physical control channel and transmit power of the uplink dedicated physical channel by interpreting transmit power control commands for the second uplink dedicated physical control channel is performed. And 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 determined as the threshold and the second value is determined. At the time of pilot transmission for controlling the transmit power of the uplink dedicated physical control channel, the transmit power of the uplink dedicated physical channel is determined according to the transmit power of the second uplink dedicated physical control channel determined in the second process or the third process, And transmit the second uplink dedicated physical control channel and the uplink dedicated physical channel to the base station at the determined transmission power, respectively, At a time other than the pilot transmission time for controlling the transmit power of the control channel, the transmit power of the uplink dedicated physical channel determined in the first process and the transmit power of the second uplink dedicated physical control channel determined in the second process or the third process are determined. And a controller for transmitting the second uplink dedicated physical control channel and the uplink dedicated physical channel to a base station, respectively.

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

In the present invention, in performing the power control of the downlink and uplink dedicated physical control channel for 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 uplink dedicated physical control channels is provided. In addition, for the sake of convenience in describing the present invention, 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 uplink 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 a UL_DPCCH transmitting a pilot for power control of UL_DPCCH is transmitted, and time slot #j 831 is a time slot in which a 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 812 is transmitted with the transmission power determined 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.

(850)를 더한 송신전력으로 상기 파일럿 필드(832)를 전송한다. 상기 전력 옵셋

(850)는 S_UL_DPCCH의 전송 전력과 상기 UL_DPCCH의 TPC 필드(835), TFCI 필드(833), FBI 필드(834)와의 송신 전력차를 의미한다. 종래의 기술에서는 UL_DPCCH의 각 필드들이 모두 동일한 전송 전력으로 전송되었다. 하지만, 본 발명에서 제안된 방법에서는 UL_DPCCH의 각 라디오 프레임 중 임의의 몇 개의 타임 슬롯들에서는 UL_DPCCH의 파일럿 필드들이 S_UL_DPCCH의 전송 전력으로 전송됨으로 인해, 상기 UL_DPCCH를 수신하는 기지국에서 상기 S_UL_DPCCH의 전송 전력이 적합한가를 판정하여 상기 S_UL_DPCCH를 위한 TPC를 생성할 수 있도록 해준다.The structure of the UL_DPCCH transmitted in the time slot #j 831 includes 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 in the time slot #j 831 enables the base station receiving the S_UL_DPCCH to generate a TPC command for controlling the transmission power of the S_UL_DPCCH while receiving the UL_DPCCH. The difference between UL_DPCCHs transmitted in the time slot #i 811 and the time slot #j 831, respectively, is a difference in the magnitude of the transmit power of the pilot field of each UL_DPCCH. The UL_DPCCH for generating a TPC for power control of the S_UL_DPCCH in the time slot #j 831 is the power offset of FIG. 8.

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 any pilot time slots of the UL_DPCCH are transmitted at the transmission power of the S_UL_DPCCH in any of several time slots of each of the radio frames of the UL_DPCCH, the transmission power of the S_UL_DPCCH at the base station receiving the UL_DPCCH is reduced. Determination of suitability allows the generation of 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 a TPC for UL_DPCH and a 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 location of the timeslot #i 811 is 0,1,3,4,6,7 of 15 timeslots. The timeslot #j (831) may be the 2nd, 5th, 8th, 11th, and 14th time slots 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-described 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_DPCH if the pilot field of the UL_DPCCH is transmitted at the transmission power of the UL_DPCH and 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 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, data rate, channel condition, signal size, and importance of 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, transmission rates of the TPC command for the UL_DPCH and the TPC command for the 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 in configuring DL_DPCH. That is, the multiplexer 420 forms a DL_DPCCH using the TPC 402, the pilot 403, and the TFCI 404 as inputs, and user data 411 or higher signaling control information is convolutionally encoded through the encoder 412. Alternatively, after turbo encoding, the DL_DPDCH is configured by inputting a signal output after being processed into a form suitable for transmission through a physical channel by the rate matching unit 413. The rate matching unit 413 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 an initial transmission packet or a retransmission packet, and the characteristics 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 has occurred.

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 antenna 501 of FIG. 5 is converted to baseband by the RF unit 502 and then demixed using the scrambling code used by the UE in the multiplier 504. The scrambling code used by the UE serves to distinguish signals between a plurality of UEs received by the base station. The signal of the UE output from the multiplier 504 is input to the despreader 510, the despreader 520, and the despreader 530, respectively, and is divided into UL_DPCCH, UL_DPDCH, and S_UL_DPCCH. The despreader 510, the despreader 520, and the despreader 530 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 despreader 510 is demodulated by the demodulator 560, only the pilot field 512 is separated from the demultiplexer 511, input to the channel estimator 513, and is upwardly transmitted from the UE to the base station. Used to estimate the channel environment, and after the pilot signal is estimated, the base station uses 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 estimator estimated by the channel estimator 513, input to the demultiplexer 515, and demultiplexed to the TPC 516, the TFCI 517, and the FBI 518. .

The UL_DPDCH output from the despreader 520 of FIG. 5 is demodulated by the demodulator 561 and then corrected using the channel estimate value of the channel estimator 513 in the multiplier 521, and then the inverse rate matcher 522. After reverse rate matching, the signal is input to the decoder 523 and recovered to the I-th user data or an upper layer signaling message. The reverse rate matching unit 522 means that the data is restored to the original data by reversing the puncturing or repetition process in the rate matching process at the transmitter of the UE. 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 the demodulator 562 and then input to the multiplier 533 to compensate for the channel using the channel estimate of the channel estimator 513.

The channel-compensated S-UL-DPCCH in the multiplier 533 of FIG. 4 is input to the demultiplexer 535 and separated into an ACK / NACK and a channel report message (hereinafter referred to as CQI), respectively. The decoder 536 and the decoder 538 are inputted to recover the CQI 537 and the ACK / NACK. The decoder 536 and the decoder 538 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 a pilot field of 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 time slot #i 811 of FIG. 8, it is used to generate a TPC for UL_DPCH, and if transmitted as transmitted in time slot #j 831, S_UL_DPCCH. Used to generate TPC for

6 is an example of a terminal transmitter for the base station receiver of FIG. 5, 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 channel gain 651 applied to the UL-DPCH, a channel gain 670 applied to the pilot 611 of the UL_DPCCH, and a channel gain 652 applied to the S_UL_DPCCH. It plays a role of controlling uplink transmission power of UL_DPCH and S_UL_DPCCH. The controller 601 receives a plurality of TPCs transmitted from a base station and uses channel TPCs for S-UL-DPCCH and TPCs for Ul-DPCH, respectively, for channel gain 670, channel gain 652, and channel gain 651. Create The channel gain 652 of FIG. 6 may be directly determined by using the TPC for S_UL_DPCCH received by the base station transmitting the HSDPA, and the other channel generated by the S_UL_DPCCH in the cell overlap region because the channel gain to which the received TPC is applied is too high. If the amount of interfering signal for the signal is too large, it may be determined as a specific threshold. The specific threshold value may be determined as a ratio of relative transmit power to UL_DPCH, and may also be determined as an 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, or may be a value previously promised and used by the base station and the UE. .

The channel gain 651 of FIG. 6 is a channel gain applied to UL_DPCH, and may be determined by receiving the TPC for UL_DPCH, and the channel gain applied to multiplier 635 of FIG. 6 is applied to the channel gain 651. It is a value that is added to or subtracted from. 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 channel gain 670 of FIG. 6 is determined by the controller 601. The channel gain 670 of FIG. 6 is 1 when the controller 601 transmits a pilot signal of UL_DPCCH to generate a TPC for UL_DPCH, and generates a TPC for S_UL_DPCCH. In the case of transmitting a pilot signal of UL_DPCCH, it may be defined as the difference between the channel gain 652 and the channel gain 651 of FIG. 6. The pilot 611 to which the channel gain 670 is applied is multiplied by the channel gain 651 for the UL_DPCH in the multiplier 617 of FIG. 6 to obtain the same transmission power as the channel gain 652 of FIG. S_UL_DPCCH is transmitted to the base station transmitting.

The multiplexer 615 of FIG. 6 receives the TPC 612, the pilot 611, the TFCI 613, and the FBI 614 for controlling downlink transmission power to configure the UL_DPCCH. The UL_DPCCH output from the multiplexer 615 is modulated in a suitable manner by the modulator 660, and then spread by the spreader 616 with the channel code applied to the UL_DPCCH, and then by the multiplier 617 and the channel gain 651 It is multiplied and input to summer 640.

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

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

The summer 640 sums up the input upstream signals and outputs the summed up signals to the multiplier 641. Since the uplink signals summed by the summer 640 can be distinguished by different channel codes, the base station receiving the signals can reproduce appropriate signals. In the multiplier 641, 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 multiplier 641 are input to the RF unit 643 to become a signal of a carrier band and then transmitted to the base station through the antenna 644.

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

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

Outputs of the demultiplexer 711 and the demultiplexer 731 of FIG. 7 are input to the summer 712 and summed. The summed signals are input to the demultiplexer 770 so that only the pilot 771 is distinguished and input to the channel estimator 720. The channel estimation result of the pilot signals 771 input to the channel estimator 720 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 channel estimator 720 is input to the multiplier 713 to be used for channel compensation of the DL_DPCH output from the summer 712, and the channel-compensated DL_DPCH is input to the demultiplexer 715 to receive TFCI ( 717) and DL_DPDCH. The DL_DPDCH output from the demultiplexer 715 is reverse rate matched by the reverse rate matching unit 718 and then input to the decoder 719. The reversed-matched DL_DPDCH is decoded by the decoder 719 and then restored to user data 720 or higher layer signaling information.

The HS_PDSCH output from the despreader 740 of FIG. 7 is input to the demodulator 772, demodulated, and then input to the multiplier 741 to be channel compensated for the channel estimation result of the channel estimator 720. Will be displayed. The HS-DSCH output from the multiplier 741 is reverse-lay matched by the reverse ray matching unit 742 and then decoded by the decoder 743 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 by the decoder 743 may be used for the operation of the N-channel SAW HARQ as described above.

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

The controller 760 of FIG. 7 receives signal estimation results of all TPCs and the pilot field of the DL_DPCCH received by the UE, and determines 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 is for the UL_DPCH, the transmission power of the UL_DPCH may be determined including the TPC command, and after receiving the TPC command, the S-UL-DPCCH If the TPC command for the S_UL_DPCCH is not received at the time of transmission, the transmit power of the S_UL_DPCCH to be transmitted currently may be determined using the transmit power of the S_UL_DPCCH used immediately before, and by applying a predetermined power offset to the transmit power of the UL_DPCH. The transmit power of S_UL_DPCCH may be determined. In addition, if the TPC transmitted by the base station transmitting the HSDPA is a TPC for S_UL_DPCCH, the transmission power of the UL_DPCH is determined by using other TPC commands in a situation other than the TPC, and the transmission power of the S_UL_DPCCH uses the TPC for the S_UL_DPCCH. Can be determined.

An example of an operation flowchart of a base station controller and an example of a terminal controller operation flowchart of the uplink 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. When the base station receives the UL_DPCCH from the upstream at 901, 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, since the base station transmitting and receiving with the UE is only one base station transmitting the HS-DSCH, the UE transmits the transmission power of the pilot field of the UL_DPCCH to control the transmission power of the S_UL_DPCCH. There is no need to change. Accordingly, when the UE is not located in the cell overlap region, the UL_DPCCH may be transmitted in the time slot #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, UL_DPCCH used for time slot #i and time slot #j of FIG. 8 are alternately used.

In step 902 of FIG. 9, the base station interprets the pilot field received at 901, and at 903, the base station determines whether the pilot field received at 901 is for S_UL_DPCCH or UL_DPCH, and if it is determined that the pilot field is for UL_DPCH, 911 Generates a TPC command to be applied to the UL_DPCH, and if the pilot field received at 901 is determined for the S_UL_DPCCH, the TPC command is generated at 904 to the S_UL_DPCCH.

In 905 of FIG. 9, after determining downlink transmission power according to a downlink power control command received at 901, 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 uplink transmission power of the UE is controlled through a normal power control algorithm that controls only the uplink transmission power of the UL_DPCH in 907, otherwise it 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 the TPC command received from the 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. 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. When the received TPC for UL_DPCH indicates a higher transmit power, the transmit power of the S_UL_DPCCH is increased, and when the received UL_DPCH TPC indicates a lower transmit power, the transmit power of the S_UL_DPCCH is transmitted immediately before the S_UL_DPCCH is transmitted. The transmission power may be transmitted as it is. 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 the S_UL_DPCCH at 1013 transmits the UL_DPCH and the 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 received. Determine whether there is no DSCH. If it is out of the cell overlap region or there is no more HS-DSCH to receive, the normal power control algorithm for the downlink dedicated channel and the uplink dedicated channel is performed at 1010, and soft handover is not terminated at 1009 or the cell overlap region If it is determined that there is more HS-DSCH to receive, 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 in step 1001 of FIG. 10 that the TPC for S_UL_DPCCH has been received, the TPC for S_UL_DPCCH and the UL_DPCH TPC transmitted from another base station are separated and analyzed in 1002. In 1002, the transmission power for S_UL_DPCCH and UL_DPCH are determined in 1003 according to the analyzed TPC for S_UL_DPCCH and TPC for UL_DPCH, 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 from causing excessive interference noise to other UEs or base stations in the cell overlap region. The threshold may be a transmission power value of S_UL_DPCCH relative to the transmission power of UL_DPCH 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 determining 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 relatively large, the transmission power of UL_DPCH will be relatively small. Therefore, the threshold applied to the transmission power of S_UL_DPCCH can be increased. If the number of base stations in the cell overlap region is relatively small, the transmission of UL_DPCH is relatively small. Since the power can be large, the threshold to be applied to the transmit power of the S_UL_DPCCH can be small. 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 in 1004 of FIG. 10 that the transmit power of the S_UL_DPCCH exceeds the threshold, the transmit power of the S_UL_DPCCH is determined by applying the threshold for the S_UL_DPCCH at 1005, and at 1006, it is determined whether or not it is the TPC pilot time of the S_UL_DPCCH. . If it is determined at 1004 that the transmit power of the S_UL_DPCCH does not exceed a threshold value, it is determined at 1006 whether or not the S_UL_DPCCH is a TPC pilot time. If it is determined at 1006 that the TPC pilot transmission time of the S_UL_DPCCH is determined, 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 in the 1003, 1005 and 1007 is determined in 1008. The pilot fields of S_UL_DPCCH and UL_DPCCH are transmitted. If it is determined that the timing of the TPC pilot transmission of the S_UL_DPCCH in step 1006, the UL_DPCH and S_UL_DPCCH is transmitted using the transmission power determined in the 1003 or 1005 in 1008.

10, the UE transmitting the UL_DPCH and 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 there is no HS-DSCH to receive any more. Judge. If it is determined that the UE is out of the cell overlap region or there is no more HS-DSCH to receive, the UE performs a normal power control algorithm for the downlink dedicated channel and the uplink dedicated channel at 1010 and the soft handover is not terminated at 1009 or If there are more HS-DSCHs 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.

In the present invention, in the uplink power control method of a base station and a mobile station communicating using HSDPA, uplink power control for a conventional uplink dedicated physical channel for downlink dedicated channel and a second uplink dedicated physical control channel for transmitting uplink control information of HSDPA. 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. And methods for creating a separate It was presented.

Claims (16)

Transmit power corresponding to the uplink dedicated physical channel at the base station to control transmission power control of an uplink dedicated physical channel and a second uplink dedicated physical control channel for a terminal located in a cell overlap region serviced by at least two base stations A method for transmitting a control command and a transmission power control command corresponding to the second uplink dedicated physical control channel to the terminal, Receiving a pilot field of an uplink dedicated physical control channel from the uplink dedicated physical channel received from the terminal; Analyzing the received pilot field to determine whether the 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 if it is determined that the pilot field corresponds to the second uplink dedicated physical control channel; Generating a transmission power control 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 transmitting the generated transmission power control commands to the terminal at a predetermined transmission time point. The method of claim 1, The transmission time is determined according to a predetermined power control ratio, The power control ratio is transmitted to the terminals in the base station via a common channel for transmitting system information in the base station. The method of claim 1, The transmission time is determined according to a predetermined power control ratio, The power control ratio is the power control method, characterized in that the terminal is received from the base station in the call setup step with the base station. The method of claim 1, The transmission time is determined according to a predetermined power control ratio, The power control ratio is a power control method characterized in that the base station is transmitted to the terminal when the terminal enters the cell overlap region. A terminal located in a cell overlap area serviced by at least two base stations includes a transmit power control command for a second uplink dedicated physical control channel and a transmit power command for uplink dedicated physical channel received from the at least two base stations. In the method for controlling the transmission power of the second uplink dedicated physical control channel and the uplink dedicated physical channel, When a transmission power control command for the uplink dedicated physical channel is received, the transmission power control command is interpreted to determine the transmission power of the uplink dedicated physical channel, and the second uplink according to the determined transmission power of the uplink dedicated physical channel. Determining a transmission power of a dedicated physical control channel; When transmission power control commands for the second uplink dedicated physical control channel are received from each of the at least two base stations, interpreting the transmission power control commands for the second uplink dedicated physical control channel to control the second uplink dedicated physical control. A second process of determining transmission power of a channel and transmission power of the uplink dedicated physical channel, respectively; A third step of determining, when 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 as the threshold value; The transmission power of the uplink dedicated physical channel is determined according to 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 for controlling the transmit power of the second uplink dedicated physical control channel. And transmitting the second uplink dedicated physical control channel and the uplink dedicated physical channel to the base station at the determined transmission power, respectively. The transmission power of the uplink dedicated physical channel determined in the first process and the second uplink dedicated physical physics determined in the second process or the third process at a time other than a pilot transmission time for transmission power control of the second uplink dedicated physical control channel. And transmitting the second uplink dedicated physical control channel and the uplink dedicated physical channel to a base station according to the transmission power of the control channel. The method of claim 5, The first process, And determining, as a transmission power of the second uplink dedicated physical control channel, a value obtained by adding a predetermined offset value to the uplink dedicated physical channel. The method of claim 5, The first process, And transmitting power of the second uplink dedicated physical control channel as transmission power of the second uplink dedicated physical control channel. The method of claim 5, The threshold is And a transmission power ratio of the second uplink dedicated physical control channel to the uplink dedicated physical channel. Transmit power control corresponding to the uplink dedicated physical channel to control transmit power control of an uplink dedicated physical channel and a second uplink dedicated physical control channel for a terminal located in a cell overlap region serviced by at least two base stations. In the base station apparatus for transmitting a command and a transmission power control command corresponding to the second uplink dedicated physical control channel to the terminal, Analyze a pilot field of an uplink dedicated physical control channel received from the uplink dedicated physical channel received from the terminal to determine whether the pilot field corresponds to the second uplink dedicated physical control channel, and determine the second uplink dedicated channel. If it is determined that the pilot field corresponds to a physical control channel, a transmission power control command to be applied to the second uplink dedicated physical control channel is generated; and if it is determined that it is not a pilot field corresponding to the second uplink dedicated physical control channel, the uplink only And a controller for generating a transmission power control command to be applied to a physical channel, and transmitting the generated transmission power control commands to the terminal at a predetermined transmission time point. The method of claim 9, The transmission time is determined according to a predetermined power control ratio, The power control ratio is transmitted to the terminals in the base station via a common channel for transmitting system information in the base station. The method of claim 9, The transmission time is determined according to a predetermined power control ratio, The power control ratio is characterized in that the terminal is received from the base station in the call setup step with the base station. The method of claim 9, The transmission time is determined according to a predetermined power control ratio, And the power control ratio is transmitted by the base station to the terminal when the terminal enters the cell overlap region. Located in a cell overlap area serviced by at least two base stations, in accordance with a transmit power control command for a second uplink dedicated physical control channel and a transmit power command for an uplink dedicated physical channel received from the at least two base stations. In the terminal device for controlling the transmission power of the second uplink dedicated physical control channel and the uplink dedicated physical channel, When a transmission power control command for the uplink dedicated physical channel is received, the transmission power control command is interpreted to determine the transmission power of the uplink dedicated physical channel, and the second uplink according to the determined transmission power of the uplink dedicated physical channel. Performing a first process of determining transmission power of a dedicated physical control channel; When transmission power control commands for the second uplink dedicated physical control channel are received from each of the at least two base stations, interpreting the transmission power control commands for the second uplink dedicated physical control channel to control the second uplink dedicated physical control. Performing a second process of determining transmission power of a channel and transmission power of the uplink dedicated physical channel, respectively; If the transmission power of the second uplink dedicated physical control channel determined in the second step exceeds a predetermined threshold, performing a third process of determining the transmission power of the second uplink dedicated physical control channel as the threshold value; At the time of pilot transmission for controlling the transmit power of the second uplink dedicated physical control channel, the transmit power of the uplink dedicated physical channel is determined according to the transmit power of the second uplink dedicated physical control channel determined in the second process or the third process. And transmit the second uplink dedicated physical control channel and the uplink dedicated physical channel to the base station at the determined transmission power, respectively. The transmission power of the uplink dedicated physical channel determined in the first process and the second uplink dedicated physical physics determined in the second process or the third process at a time other than a pilot transmission time for transmission power control of the second uplink dedicated physical control channel. And a controller for transmitting the second uplink dedicated physical control channel and the uplink dedicated physical channel to a base station according to the transmission power of the control channel. The method of claim 13, The controller may determine, in the first process, a value obtained by adding a predetermined offset value to the uplink dedicated physical channel as the transmission power of the second uplink dedicated physical control channel. The method of claim 13, In the first step, the controller determines the transmission power of the second uplink dedicated physical control channel as the transmission power of the second uplink dedicated physical control channel. The method of claim 13, The threshold is And the transmission power of the second uplink dedicated physical control channel to the uplink dedicated physical channel is determined.

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