KR20030088614A - Data transmitting/receiving method for wireless communicatio system - Google Patents

Abstract

PURPOSE: A method for transceiving data of a wireless communication system is provided to inform a terminal of an antenna to which an HSDPA channel is transmitted, through additional information, when transmit diversity is not applied to the HSDPA channel, thereby improving receiving performance of the terminal. CONSTITUTION: A wireless communication system selects one of antennas while transmitting a specific channel. The wireless communication system informs a receiving terminal of the selected antenna transmitting the specific channel. The wireless communication system transmits data of the specific channel through the selected antenna. The wireless communication system informs the receiving terminal of an antenna to which an HSDPA channel is transmitted, with another bit information, when transmit diversity is not applied to the HSDPA channel.

Description

DATA TRANSMITTING / RECEIVING METHOD FOR WIRELESS COMMUNICATIO SYSTEM}

The present invention relates to a wireless communication system, and more particularly, to a data transmission / reception method of a wireless communication system supporting transmission diversity.

Currently, Space Time Transmit Diversity (STTD) is adopted as an open loop transmit diversity scheme in 3GPP. Here, the open loop means that the feed back is not received from the receiving end.

The prior art STTD is intended to obtain not only temporal diversity but also spatial diversity gain by using two antennas and simple coding in space-time between symbols transmitted from the two antennas.

The prior art configuration requires two antennas and a space time coding block for coding between symbols transmitted by the two antennas.

Here, spatial means that two antennas are separated from each other spatially. Usually, if the distance is more than four times the wavelength, there is a diversity effect. Temporal means changing the order of transmission bits.

There are two types of conventional STTD, closed loop transmit diversity and open loop transmit diversity.

A conceptual diagram of STTD, which is a kind of open loop transmit diversity in the prior art, is illustrated in FIG. In addition, a simple configuration of closed loop transmit diversity is illustrated in FIG.

Conventional closed-loop transmit diversity measures the channel state at the terminal to obtain the optimal transmission weight according to the channel state, returns it to the base station, and applies the weight to the transmit antenna array at the time of transmission to improve the reception performance at the terminal. It's a way to improve.

Such closed loop transmit diversity requires a separate circuit for multiplying each antenna with a weight for applying transmit diversity to the base station transmitter. In addition, a common pilot channel (CPICH) for distinguishing each antenna must be transmitted differently from each antenna. Also, since a closed loop transmission diversity system is used for a terminal receiver, a terminal estimates and transmits a CPICH transmitted from each antenna of a base station. A separate part is needed to calculate the weight multiplied by the antenna angle.

In the case of open-loop transmit diversity, STTD has been proposed that obtains diversity effect through space-time block coding, in which a channel coding technique mainly applied on a time axis in a base station is expanded in space. Closed loop transmit diversity is a method of improving reception performance by measuring a channel state at a terminal to obtain an optimal transmission weight according to the channel state, and returning the result to a base station to apply a weight at the time of transmission.

Such open loop transmit diversity requires a separate STTD decoder for a base station transmitter, requires two transmit antennas, and a separate STTD decoder for a terminal receiver.

In these two approaches, there must be multiple antennas at the base station. Currently, the use of two transmit antennas is reflected in the standard.

Hereinafter, a brief description of the conventional STTD.

As an open-loop transmit diversity method, an STTD has been proposed that obtains a diversity effect through space-time coding in which a channel coding technique mainly applied on a time axis is extended to a space.

This scheme is applicable to all downlink physical channels except SCH of WCDMA. Since the STTD method does not require a feedback signal, there is no advantage in performance change with speed. The operation principle of STTD can be expressed as shown in [Table 1] below.

Time t Time t + T Antenna 0 Antenna 1

In Table 1, T is the symbol period.

As shown in Table 1, the symbol to be transmitted is STTD encoded and transmitted to antennas 0 and 1 according to a time sequence. A signal transmitted to each antenna passes through different independent channels, and assuming that the channel at time t and the channelley at t + T are the same, the receiving antenna stage receives the signals as follows.

here, , Denotes a channel between the transmitting antennas 0 and 1 and the receiving antenna, respectively. , Means complex noise at the receiver.

Each channel can be estimated as a pilot signal, and when the received signals are combined as follows, the same value as that of the Maximum Radio Conbining (MRC) scheme of the reception diversity can be obtained, and the transmitted symbol can be estimated based on this.

On the other hand, the description of the HSDSCH technology as follows.

UMTS (Universal Mobile Telecommunications System) is a third generation mobile communication system that evolved from the Global System for Mobile Communications (GSM) system, which is a European second generation mobile communication standard.The GSM Core Network and Wideband Code Division Multiple Access (WCDMA) It aims to provide better mobile communication service based on access technology.

The first generation mobile communication refers to the analog method, the second generation mobile communication means the evolution to the digital method, and the third generation method is commonly called IMT-2000, and it means a breakthrough in communication capability.

For the international standardization of UMTS, in December 1998, national or national standards-setting bodies such as ETSI in Europe, ARIB / TTC in Japan, T1 in the United States, and TTA in Korea were established by the Third Generation Mobile Standardization Group (Third Generation). The Partnership Project (hereinafter abbreviated as 3GPP) is formed, and through this 3GPP, detailed specification of UMTS, a European IMT-2000 system, is defined.

In 3GPP, UMTS standardization work is divided into 5 Technical Specification Groups (hereinafter abbreviated as TSG) in consideration of the independence of network components and their operation for the rapid and efficient technology development of UMTS. I'm going.

Each TSG is responsible for the development, approval, and management of standards within the relevant areas, among which the Radio Access Network (hereinafter referred to as RAN) group (TSG-RAN) is a WCDMA access technology (asynchronous) in UMTS. Develop specifications for the functions, requirements, and interfaces of the UMTS Terrestrial Radio Access Network (hereinafter referred to as UTRAN), a new radio access network to support CDMA).

The TSG-RAN Group is again composed of a Plenary Group and four Working Groups.

Working Group 1 (WG1) develops standards for the Physical Layer (WG1), while the second Working Group (WG2) works with the Data Link Layer (2nd Layer) and Network Layer (WG2). Role of the third tier).

In addition, the third operation group defines standards for interfaces between base stations, radio network controllers (hereinafter referred to as RNCs) and core networks in the UTRAN, and the fourth operation group relates to radio link performance. Discuss requirements and requirements for radio resource management.

3 is a block diagram showing the structure of the UTRAN of the 3GPP system.

Referring to FIG. 3, the UTRAN 310 is composed of one or more Radio Network Sub-systems (hereinafter referred to as RNS) 320, 330, and each RNS 320, 330 is one RNC (321, 331) and its It consists of one or more base stations (Node Bs) 322, 323, 332, 333 managed by RNCs 321, 331. In addition, the RNCs 321 and 331 are connected to a mobile switching center (MSC) 341 for circuit switched communication with a GSM network, and SGSN (for packet switched communication with a general packet radio service (GPRS) network). Serving GPRS Support Node) 342.

And, the base station (Node B) (322,323) (332,333) is managed by the RNC (321,331) and receives information sent from the physical layer of the terminal 350 in the uplink, and the terminal 350 in the downlink It serves as an access point of the UTRAN to the terminal transmitting to.

The RNCs 121 and 131 are in charge of allocating and managing radio resources. The RNC, which is responsible for the direct management of the base station Node B, is called a control RNC (CRNC), and is in charge of managing a common radio resource.

A place that manages dedicated radio resources allocated to each terminal is called a serving RNC (SRNC).

The control RNC and the responsible RNC may be the same, but when the terminal moves out of the area of the responsible RNC to the area of another RNC, the control RNC and the responsible RNC may be different.

The various components in the UMTS network can be in different locations, so an interface is needed to connect them.

The base station Node B and the RNC are connected by an Iub interface, and the RNC is connected through an Iur interface. The interface between the RNC and the core network is called Iu.

Figure 4 shows the structure of the interface protocol of the 3GPP radio access network standard for the terminal and the network to connect wirelessly over the air.

4, the radio access interface protocol is composed of a physical layer (PHY), a data link layer and a network layer horizontally, and vertically transmits a control plane and data information for transmitting control signals. It is divided into user planes. Here, the user plane is an area in which traffic information of the user is transmitted, such as voice or IP packet transmission, and the control plane is an area in which control information is transmitted, such as interface or network maintenance and management of a network.

The protocol layers of FIG. 4 are based on the lower three layers of the Open System Interface (OSI) reference model of seven layers, which are well known in communication systems, and include the first layer L1, the second layer L2, It may be divided into a third layer (L3).

The first layer L1 serves as a physical layer (PHY) for the air interface, and a transport channel with a medium access control layer (hereinafter referred to as MAC) layer on the upper layer. It is connected through the channels and transmits the data delivered to the physical layer through the transport channel to the receiver using various coding and modulation methods suitable for the wireless environment.

The transport channel existing between the physical layer (PHY) and the MAC layer is a dedicated transport channel and a common transport depending on whether the terminal can be used exclusively or shared by multiple terminals. It is divided into channels (Common Transport Channel).

The second layer L2 serves as a data link layer, and allows multiple terminals to share radio resources of the WCDMA network. The second layer (L2) is the MAC layer, Radio Link Control (hereinafter referred to as RLC) layer, Packet Data Convergence Protocol (hereinafter referred to as PDCP) layer, and broadcast / multicast control (Broadcast / Multicast Control; hereinafter abbreviated as BMC) is divided into layers.

The MAC layer transfers data through an appropriate mapping relationship between logical channels and transport channels.

Logical channels are provided with various logical channels according to the type of information transmitted to the channels connecting the upper layer and the MAC layer.

In general, a control channel is used to transmit control plane information, and a traffic channel is used to transmit information of the user plane.

The RLC layer configures an appropriate RLC PDU suitable for transmission by a segmentation and concatenation function of an RLC SDU transmitted from an upper layer, and performs an automatic repeat request for retransmitting the lost RLC PDU during transmission; ARQ) function can be performed.

The RLC SDU or RLC PDU descended from the upper layer operates in three ways: transparent mode, unacknowledged mode, and acknowledgment mode, depending on the method of processing the RLC SDU from the upper layer. There is an RLC buffer for storing them.

The PDCP layer is located on top of the RLC layer and makes data transmitted through a network protocol such as IPv4 or IPv6 suitable for transmission in the RLC layer.

In particular, a header compression technique that compresses and transmits header information of a packet may be used for efficient transmission of an IP packet.

The BMC layer enables a message transmitted from a cell broadcast center (CBS) to be transmitted through an air interface. The main function of the BMC is to schedule and transmit a cell broadcast message transmitted to a terminal, and generally transmits data through an RLC layer operating in an unresponsive mode.

For reference, since the PDCP layer and the BMC layer transmit only user data, they are located only in the user plane. Unlike these, the RLC layer may belong to the user plane or to the control plane depending on the layer connected to the upper layer. In the case of belonging to the control plane corresponds to the case of receiving data from the radio resource control (hereinafter referred to as RRC) layer, otherwise it corresponds to the user plane.

In general, a service of transmitting user data provided to the upper layer by the second layer L2 in the user plane is defined as a radio bearer (RB), and the upper layer by the second layer L2 in the control plane. The transmission service of the control information provided by is defined as a signaling radio bearer (SRB).

In addition, as shown in FIG. 4, in the case of the RLC layer and the PDCP layer, several entities may exist in one layer. This is because one terminal has several radio carriers, and generally only one RLC entity and PDCP entity are used for one radio carrier. Entities of the RLC layer and the PDCP layer may perform independent functions in each layer.

The RRC layer located at the bottom of the third layer L3 is defined only in the control plane, and is responsible for control of transport channels and physical channels in connection with setting, resetting, and releasing radio carriers. In this case, the radio carrier setup (RB setup) refers to a process of defining characteristics of a protocol layer and a channel necessary for providing a specific service and setting each specific parameter and operation method.

The WCDMA system described above aims at a transmission rate of 2Mbps in a indoor and pico-cell environment and 384kbps in a general wireless environment. However, as the wireless Internet is becoming more common and the number of subscribers is increasing, more various services are emerging, and higher speeds are required to support them.

Therefore, 3GPP is currently evolving the WCDMA network to provide a high speed transmission rate, and one of the representative systems is High Speed Downlink Packet Access (hereinafter abbreviated as HSDPA). have.

Based on WCDMA, the HSDPA system can support speeds of up to 10Mbps in downlink, and can provide shorter latency and improved capacity. The techniques employed in the HSDPA system to provide improved transmission rates and capacities include Link Adaptation (LA), Hybrid Automatic Repeat Request (HARQ), and fast cell selection. Fast Cell Selection (hereinafter referred to as FCS), and Multiple Input Multiple Output (hereinafter referred to as MIMO) antenna techniques.

The link adaptation technique (LA) uses a modulation and coding scheme (abbreviated as MCS) according to the state of the channel. If the channel state is good, a high modulation such as 16QAM and 64QAM is used. In case the channel condition is not good, a low modulation method such as QPSK is used.

In general, the low-modulation method has a smaller amount of transmission than the high-modulation method, but it shows excellent transmission success rate when the channel environment is not good. Therefore, it may be considered to be advantageous when the influence of fading or interference is large. .

On the contrary, the high modulation methods have a much higher frequency utilization efficiency than the low modulation methods, and can provide a transmission rate of 10 Mbps using the 5 MHz bandwidth of the WCDMA. However, it is very sensitive to the effects of noise and interference.

Therefore, when the terminal is located close to the base station, it is possible to increase the transmission efficiency by using 16QAM or 64QAM, and when the terminal is located at the cell boundary or the influence of fading is low, a low modulation method such as QPSK is useful. Do.

The HARQ method is a retransmission method having a different concept from that of a packet retransmission performed in the RLC layer. This ensures higher decoding success rates by combining data used and retransmitted in conjunction with the physical layer with previously received data. In other words, the packet that failed to be transmitted is stored without being discarded, and the packet is re-transmitted and decoded by combining in the previous step. Therefore, when used together with the LA technique, the packet transmission efficiency can be greatly increased.

The FCS method is similar to the conventional soft handover. Although the terminal may receive data from multiple cells, the terminal may receive data from a cell having the best channel state in consideration of the channel state of each cell. Conventional soft handover is a method of receiving data from multiple cells and increasing the transmission success rate using diversity, but the FCS method receives data from only one specific cell in order to reduce interference between cells.

MIMO antenna technique is a method that can improve the data transmission speed by using several independent channels in a channel environment where scattering is high. It is a system that is composed of several transmitting antennas and several receiving antennas to obtain diversity gain by reducing the correlation between radio waves received for each antenna.

Meanwhile, the HSDPA system is based on the existing WCDMA network and tries to introduce a new technology while keeping the WCDMA network as it is. However, some modifications are inevitable to incorporate new technologies. Representatively, the example is an improvement of the existing base station (Node B) function. That is, in the WCDMA network, most of the control functions are located in the RNC, but most of the new technologies for the HSDPA system are managed by the base station (Node B) in order to adapt to the channel situation more quickly and reduce the delay time to the RNC. However, the extended function of the base station (Node B) is not a replacement for the RNC, and from the standpoint of the RNC, it can be seen that the functions for the high speed data transmission are in charge of the supplementary functions added.

Therefore, unlike the existing WCDMA system, the base station Node B has been modified to perform a part of the MAC function, and a layer for performing this is called a MAC-hs sublayer.

The MAC-hs sublayer may be located above the physical layer to perform packet scheduling or HARQ and LA functions. In addition, a transport channel called HS-DSCH (HSDPA Downlink Shared Channel), which is different from the existing transport channel, is used for data transmission for HSDPA.

The HS-DSCH has a short transmission time interval (TTI) (3 slots, 2 ms), unlike the DSCH defined in the conventional WCDMA system standard R'99 / R'4, and has a high data rate. It supports various modulation code set (MCS) that can be used.

Optimum performance can be obtained by selecting the best MCS for the channel situation.

To this end, hybrid ARQ (HARQ) technology, which combines automatic repeat request (ARQ) technology and channel coding technology, ensures reliable transmission and uses code division multiplexing (CDM). It is proposed to support up to four users at the same time. The physical channel corresponding to the transport channel HS-DSCH is the same as before.

As described above, control information is required for HS-DSCH, and the information is transmitted through a shared control channel (HS-SCCH) introduced in the HSDPA standard.

For reference, Release 1 and Release 2 are the standard versions for Global System for Mobile Communication (GSM) respectively, and R'99 is the abbreviation of Release 1999, referring to the standard version of 3GPP. , Same as Release 3).

R4 refers to the standard version of 3GPP and is an acronym for Release 4 (released in March 2001, same as Release 2000).

In addition, Release 5 is the version currently in the process of standardization and supports HSDPA.

A physical channel corresponding to the transport channel HS-DSCH will be described.

The 3GPP system supports high speed packet data service in downlink with HS-DSCH transmission.

To this end, a new structure of a transport channel called HS-DSCH and control signaling for it have been proposed.

5 illustrates a subframe structure of a physical channel HS-PDSCH to which an HS-DSCH is mapped.

The HS-PDSCH is transmitted in one or multiple SF = 16 codes. The HS-DSCH subframe consists of three slots. HS-PDSCH is modulated with QPSK or 16 QAM.

As described above, transmission of control information for the HS-DSCH is required. This information is transmitted through the physical channel shared control channel (HS-SCCH). Control information can be largely divided into transport format and resource related information (TFRI) and HARQ-related information. The TFRI includes information on the HS-DSCH transport channel set size, the modulation method, the coding rate, and the number of multicodes, and the HARQ-related information includes information such as a block number and a redundancy version. In addition, information about UE identification (UE Id) is transmitted to indicate which user's information. UE Id-related information performs a CRC operation together with TFRI and HARQ information to transmit only the resulting CRC.

6 is an exemplary diagram illustrating a subframe structure of a downlink shared control channel for transmitting downlink control information.

7 is a signal flow diagram illustrating a downlink shared control channel transmission configuration of the HS-SCCH for one UE. Here, the number M = 4 of HS-SCCHs configurable to one UE.

However, in the current WCDMA system, when the channel for the newly proposed High Speed Downlink Packet Access (HSDPA) system and the existing channel for Rel99 and Rel4 are transmitted through the same base station antenna, the HSDPA is proposed. When no transmit diversity is applied to a channel, there is no way to tell which antenna transmits the HSDPA channel.

Therefore, in the related art, if the transmitting antenna is not known, the reception of the pilot signal of the CPICH may be confusing, thereby degrading the quality of signal reception.

Accordingly, the present invention relates to a data transmission / reception method of a wireless communication system supporting transmission diversity created to improve a conventional problem.

That is, the present invention does not apply transmit diversity to an HSDPA channel when a channel for a newly proposed HSDPA system and an existing channel for Rel99 and Rel4 are transmitted through the same base station antenna in order to increase forward capacity in a WCDMA system. An object of the present invention is to propose a method of transmitting information for designating an antenna for transmitting an HSDPA channel.

In addition, the present invention is to promise that in a system supporting STTD to inform the receiving terminal to transmit the specific channel to the receiving terminal when transmitting a specific channel by selecting one antenna in a specific channel transmission The present invention relates to a method for transmitting and receiving a received signal and a method for using a terminal specific number.

That is, the present invention transmits to the existing Rel99 and Rel4 channels, for example, the DPCH for Rel99 and Rel4 in the DPCH, which is not a channel for HSDPA in the transmission diversity application, that is, a channel for HS-SCCH and HS-DSCH and HSDPA. When diversity is applied, but transmit diversity is not applied to a channel for HSDPA, a method for informing which antenna to transmit a channel for HSDPA from among a plurality of antennas is proposed.

1 is a conceptual diagram of a conventional open loop transmit diversity system.

2 is a conceptual diagram of a conventional closed loop transmit diversity system.

3 is a configuration diagram of the UTRAN of the 3GPP system.

4 is an exemplary view showing an interface protocol structure of a radio access network standard of a 3GPP system.

5 is an exemplary view showing a subframe structure of an HS-PDSCH channel.

6 is an exemplary diagram showing a subframe structure of an HS-SCCH channel.

7 is a signal flow diagram illustrating a transmission structure of an HS-SCCH channel for a UE.

According to an aspect of the present invention, there is provided a wireless communication system supporting STTD with at least two transmission antennas, in order to achieve the above object, selecting one antenna among the antennas in a specific channel transmission, and transmitting a specific channel to a receiving terminal. And transmitting the data of the specific channel through the selected antenna.

In this method, when transmit diversity is applied to a DPCH for WCDMA, but transmit diversity is not applied to a channel for HSDPA, a separate information is provided to indicate which antenna is to transmit a channel for HSDPA. It features.

In the above method, when the communication between the base station and the terminal is started, the terminal informs the terminal which antenna to transmit the HSDPA channel when the transmit diversity is not used for the HSDPA channel through the RRC signaling.

In the method, the new data indicator bit of the HS-SCCH channel indicates to which antenna an HSDPA channel is transmitted.

In addition, the present invention provides a wireless communication apparatus for receiving an STTD signal transmitted through at least two transmission antennas to achieve the above object,

Receiving information indicating that one of the antennas is selected for transmission of a specific channel from a transmission system; receiving a control signal for the specific channel through the selected antenna; and selecting data of the specific channel. And receiving data through an antenna, and decoding the received signal by using the received control information.

Meanwhile, the present invention provides a wireless communication system supporting STTD with at least two transmission antennas in order to achieve the above object. Selecting one of the antennas, and transmitting data of the specific channel through the selected antenna to achieve data transmission.

In addition, the present invention in the wireless communication device for receiving the STTD signal transmitted through at least two transmission antennas in order to achieve the above object, selecting one of the antennas based on the identification number assigned to them Receiving a control signal for the specific channel through the selected antenna, receiving data of the specific channel through the selected antenna, and decoding the received signal using the received control information. It characterized in that to achieve the data reception, including the step of.

Hereinafter, the present invention will be described in detail with reference to the drawings.

The range to which the present invention is applied can be considered as shown in Table 2 below.

Whether transmit diversity is applied Whether transmit diversity is applied Rel99 and Rel4 Channel (DPCH) Enable STTD Closed Loop Transmit Diversity HSDPA Channel Disable transmit diversity Disable transmit diversity

One embodiment of the present invention is as follows.

Initially, when communication between the base station and the terminal is started, the terminal informs the terminal of which antenna to transmit the HSDPA channel when the transmit diversity is not used for the HSDPA channel through RRC signaling (signal transmission through a lower layer between the RRC layers). do.

In this case, since two antennas are used for transmit diversity for Rel99 and Rel4, only one additional bit needs to be added to indicate which of the two antennas transmits the HSDPA channel.

In addition, when the base station needs more antennas for transmit diversity in the future, only additional bits need to be added considering the number of cases to select which antenna to use for HSDPA.

In addition, another embodiment of the present invention will be described.

This is to indicate which antenna is to be used for a field that is not used when transmitting the first HS-SCCH among several fields of the HS-SCCH.

HS-SCCH is composed of the following contents.

1) Transport Format and Resource related Information (TFRI)

(1) Channelization code set: 7bits

(2) Modulation scheme: 1bit

(3) Transport-block size: 6 bits

2) Hybrid-ARQ Information

(1) HARQ process number: 3 bits

(2) Redundancy version: 3 bits

(3) New data indicator: 1bit

3) UE ID: 10bits

Among these fields, a field that may not be used when the first communication between the terminal and the base station is a new data indicator, and of course new data will be transmitted at first, so it may be added to indicate which antenna to use. In other words, assuming that the new data indictor bit is transmitted as 1 when the first data is transmitted, if the antenna transmitting HSDPA is transmitted as it is first, and if it transmits to 0 in the second case, the HSDPA channel is transmitted to a certain antenna. I can tell you. This is only the case when considering two antennas currently under consideration in WCDMA.

Meanwhile, another embodiment of the present invention will be described.

By determining the even / odd number of the ID (UE ID and defined in the specification) of the terminal using the HSDPA to determine which antenna to transmit the HSDPA channel.

For example, for even UEs, the HSDPA channel is transmitted to the first of two antennas and for the odd UEs, the HSDPA channel is transmitted to the second antenna. Of course, even / odd assignment can be performed in the same way.

As described in detail above, the present invention aims to increase the forward capacity in the current WCDMA system, when the channel for the newly proposed HSDPA system and the existing channel for Rel99 and Rel4 are transmitted in the same base station antenna. When the city is not applied, the reception performance in the terminal can be improved by notifying the terminal through additional information about which antenna is to transmit the HSDPA channel.

Claims (9)

In a wireless communication system supporting STTD with at least two transmit antennas, Selecting one antenna among the antennas in a specific channel transmission; Informing a receiving terminal of an antenna for transmitting the specific channel; Transmitting data of the specific channel through the selected antenna A data transmission method in a wireless communication system comprising a. The method of claim 1, wherein when the transmit diversity is applied to the DPCH for WCDMA but not to the channel for HSDPA, separate bit information is used to indicate to which of the plurality of antennas the channel for HSDPA is to be transmitted. A data transmission method of a wireless communication system characterized by The method according to claim 1, wherein when the communication between the base station and the terminal is first started, when the transmit diversity is not used for the HSDPA channel through the RRC signaling to the terminal, the HSDPA channel is transmitted to an antenna using an unused field among the fields of the HS_SCCH. And a method for transmitting data in a wireless communication system. The method of claim 1, wherein the bit for indicating which antenna of the HS-SCCH channel to transmit the HSDPA channel to is a new data indicator bit. 2. The method of claim 1, wherein the antenna determines a specific antenna for which the HDPD channel is to be transmitted using a UE ID using HSPDA. The method of claim 5, wherein the transmission of the HSPD channel is determined by dividing an even number of terminal IDs. In the wireless communication device for receiving the STTD signal transmitted through at least two transmit antennas, Receiving from the transmission system information indicating that one of the antennas is selected for transmission on a particular channel; Receiving a control signal for the specific channel through the selected antenna; Receiving data of the specific channel through the selected antenna; And decoding a received signal by using the received control information. In a wireless communication system supporting STTD with at least two transmit antennas, Selecting one of the antennas based on the identification number given to the terminal receiving the specific channel in transmission of the specific channel; And transmitting the data of the specific channel through the selected antenna. In the wireless communication device for receiving the STTD signal transmitted through at least two transmit antennas, Selecting one of the antennas based on the identification number assigned to the user; Receiving a control signal for the specific channel through the selected antenna; Receiving data of the specific channel through the selected antenna; And decoding a received signal by using the received control information.