KR20020030543A - Forward link transmitter for packet data service in mobile telecommunication system supporting multimedia service and transmission method thereof - Google Patents

Abstract

PURPOSE: A forward link transmitter for a packet data service in a mobile communication system for supporting a multimedia service and a signal transmitting method thereby are provided to perform an efficient packet data service of the mobile communication system capable of supporting the multimedia service including a voice service and a data service. CONSTITUTION: A scrambler(211) scrambles channel-coded bits of a traffic. A channel interleaver(212) interleaves the output of the scrambler(211). A symbol modulator(213) performs a symbol modulation of the output of the interleaver(212). A sequence repeater/symbol puncher(214) repeats/punches the output of the symbol modulator(213) according to a transmission rate. A symbol demultiplexer(215) demultiplexes the output of the sequence repeater/symbol puncher(214). A Walsh spreader(216) performs a Walsh spreading of the output of the symbol multipelxer(215). An adder(218) performs a chip level adding of the output of the Walsh spreader(216). A signal point mapper(201) performs a signal point mapping of a preamble signal. A Walsh spreader(202) performs a Walsh spreading of the output of the signal point mapper(201). A sequence repeater(203) repeats the output of the Walsh spreader(202) according to a sequence transmission rate. A signal point mapper(221) performs a signal point mapping of a pilot signal. A Walsh spreader(222) performs a Walsh spreading of the output of the signal point mapper(221). A gain controller(223) controls a gain of the output of the Walsh spreader(222).

Description

Forward link transmitter and packet transmission method for packet data service in mobile communication system supporting multimedia service {FORWARD LINK TRANSMITTER FOR PACKET DATA

The present invention relates to a mobile communication system supporting a multimedia service including voice and data services, and more particularly, to a forward link transmitter and a signal transmission method for a packet data service of the communication system.

A typical mobile communication system, for example, a code division multiple access (CDMA) mobile communication system such as IS-2000, only supports voice service. However, as technology advances along with user demands, mobile communication systems tend to develop in the form of supporting data services. Mobile communication systems such as so-called "High Data Rate (HDR)" are systems for supporting only high speed data services.

As such, the existing mobile communication system is considered to support only a voice service or only a data service. That is, although the mobile communication system needs to simultaneously service a voice service and a data service, the existing mobile communication system supports each service separately. Therefore, there is a need and implementation of a mobile communication system capable of supporting data services while supporting existing voice services.

Accordingly, an object of the present invention is to provide a forward link transmitter and a signal transmission method for an efficient packet data service of a mobile communication system capable of supporting a multimedia service including a voice service and a data service.

Another object of the present invention is to provide a structure of new channels constituting the forward link.

Another object of the present invention is to provide a new slot structure that is the minimum unit of data transmission.

According to the present invention for achieving the above objects, a forward link transmission apparatus for packet data services in a mobile communication system supporting a multimedia service including voice and data services includes a first channel transmitter, a second channel transmitter and a third channel. It includes a transmitter. The first channel transmitter performs time division multiplexing on data traffic, a preamble signal for designating a corresponding terminal for the traffic, and a pilot signal which is an amplitude reference value for synchronous demodulation. The second channel transmitter outputs quality of service matching indication information related to quality of service (QoS) matching of the traffic, reverse activity indication information for adjusting a traffic load of a reverse link, and a base station that can be allocated to the traffic. Time-division multiplexed Walsh spatial information of the output. The third channel transmitter outputs common power control information for power control of a physical channel for a data service operating in a dedicated line scheme in a reverse link. By using the existing 1x bandwidth, the forward link transmission apparatus may simultaneously support data services while being compatible with a mobile communication system supporting only voice services.

Is a diagram illustrating a forward link data traffic channel structure for a packet data service according to an embodiment of the present invention.

1B is a diagram illustrating a forward link data traffic MAC channel structure for a packet data service according to an embodiment of the present invention.

2 shows a configuration of a forward link transmitter for a data traffic channel according to an embodiment of the present invention.

3 illustrates a configuration of a forward link transmitter for a data traffic MAC channel according to an embodiment of the present invention.

4 illustrates a configuration of a forward link transmitter for a common power control channel (CPCCH) according to an embodiment of the present invention.

5 illustrates a configuration for orthogonal spreading and high frequency (RF) band frequency transition for a forward link channel according to an embodiment of the invention.

DETAILED DESCRIPTION A detailed description of preferred embodiments of the present invention will now be described with reference to the accompanying drawings. It should be noted that reference numerals and like elements among the drawings are denoted by the same reference numerals and symbols as much as possible even though they are shown in different drawings. In the following description of the present invention, if it is determined that a detailed description of a related known function or configuration may unnecessarily obscure the subject matter of the present invention, the detailed description thereof will be omitted.

First of all, the present invention relates to a forward link of a mobile communication system capable of supporting a multimedia service including voice service and data service using 1x bandwidth. The transmitter, channel, and receiver structure for supporting the voice service remains the same as the transmitter, channel, and receiver structure of the existing 1x system, respectively. Here, 1x bandwidth refers to a frequency bandwidth of 1.25MHz used in the existing IS-95 series North American synchronous system, and 1x system refers to a system supporting 1x bandwidth. The data service may be broadly classified into a circuit mode operation and a packet mode operation according to the type of circuit connection for the service. The data service may be various video services such as a video conference, an internet service, or the like. The dedicated line data service uses the structure of the transmitter, channel, and receiver of the existing 1x system. Therefore, in the following invention, a transmitter, channel, and receiver structure for a packet data service will be described.

First, a summary of channels required for packet data service in a forward link of a mobile communication system according to an embodiment of the present invention is shown in Table 1 below.

Channels for Forward Link Packet-Based Data Services channel Usage Remarks Pilot channel Multiplexed with the preamble subchannel and the data traffic subchannel, the pilot symbol provided through the pilot channel is used as an amplitude reference value for synchronous demodulation and can be used as an auxiliary means to increase the accuracy of the CIR measurement for rate control. . Data Traffic Channel Preamble Subchannel It is transmitted multiplexed with the pilot channel and the data traffic subchannel, and is used for the purpose of designating the corresponding terminal for the data packet transmitted by the base station. Data Traffic Channel Data Traffic Subchannel The channel is multiplexed with the pilot channel and the preamble subchannel to actually transmit the payload. Data Traffic Channel QoS Matching Indication Channel QoS matching technique is used to guarantee different QoS for each data service, and it is a channel for transmitting information related to QoS matching. Data TrafficMAC Channel Walsh Space Indication Subchannel A channel for transmitting Walsh spatial information of a base station that can be allocated to a data traffic subchannel through dynamic Walsh allocation. Data TrafficMAC Channel Reverse Activity Indication Subchannel Broadcast channel for controlling the traffic load of the reverse link. Data TrafficMAC Channel

Referring to Table 1, the channels for the forward link packet data service according to the embodiment of the present invention are largely divided into a data traffic channel and a data traffic MAC channel. The data traffic channel includes a pilot channel, a preamble subchannel, and a data traffic subchannel. The data traffic MAC channel includes a Quality of Service (QoS) Matching Indication Channel, a Walsh Space Indication Subchannel, and a Reverse Activity Indication Subchannel. . The pilot channel is multiplexed with the preamble subchannel and the data traffic subchannel, and the pilot symbol provided through the pilot channel is used as an amplitude reference value for synchronous demodulation and also as an auxiliary means for increasing the accuracy of the CIR measurement for rate control. Can be utilized. The preamble subchannel is multiplexed with a pilot channel and a data traffic subchannel, and is used for the purpose of designating a corresponding terminal for a data packet transmitted by a base station. The data traffic subchannel is a channel multiplexed with a pilot channel and a preamble subchannel to actually transmit a payload. The QoS matching indication channel uses a QoS matching technique to guarantee different QoS for each data service, and is a channel for transmitting information related to QoS matching. The QoS match indication channel becomes an I-ch component of the data traffic MAC channel. The Walsh space indication subchannel is a channel for transmitting Walsh space information of a base station that can be allocated to a data traffic subchannel through dynamic Walsh allocation. The Walsh spatial indication subchannel is multiplexed with the backward active indication subchannel to become the Q-ch component of the data traffic MAC channel. The reverse active indication subchannel is a broadcast channel for controlling the traffic load of the reverse link, and is multiplexed with the Walsh space indication subchannel to become a Q-ch component of the data traffic MAC channel.

In addition to the channels described in Table 1, a channel for a forward link packet data service according to an embodiment of the present invention is common for power control of a physical channel for a data service that operates in a dedicated line over a reverse link. There is a common power control channel (hereinafter referred to as "CPCCH").

FIG. 1A illustrates a forward link data traffic channel structure for a packet data service according to an embodiment of the present invention, and FIG. 1B illustrates a forward link data traffic MAC channel structure for a packet data service according to an embodiment of the present invention. Drawing. 1A and 1B, a minimum transmission unit of a physical layer for packet data service is a slot configured of 1,536 chips, which has a duration of 1.25 msec.

Referring to FIG. 1A, one slot of a data traffic channel (DTCH) is divided into two half slots composed of 768 chips. The first 128 chip section of each half slot is allocated to a pilot channel (PICH) for inserting a pilot symbol. The remaining 640 chips except the portion allocated to the PICH in each half slot are allocated to a data traffic subchannel (DTSCH) for payload. In the case of an idle slot in which no payload exists, the DTSCH is gated off to reduce interference to a service connected to a dedicated line and adjacent base station signals.

Referring to FIG. 1B, a data traffic MAC channel (DTMACCH) includes a first channel (I-ch) and a second channel (Q-ch). The first channel I-ch is used as a matching matching indication channel (QMICH). The second channel Q-ch is used as a Walsh Space Indication Subchannel (WSISCH) and a Reverse Activity Indication Subchannel (RAISCH). During one slot, the WSISCH and RAISCH occupy 1,280 chips and 256 chips, respectively, and these channels are multiplexed to form a second channel Q-ch of the DTMACCH.

Meanwhile, preamble subchannels (PSCHs) not shown in FIGS. 1A and 1B are multiplexed with PICH and DTSCH and transmitted through DTCH. Since the PSCH is used for the purpose of designating a corresponding terminal for a data packet transmitted by a base station, the PSCH must exist in the first slot of the DTCH for transmission of a physical layer packet. The preamble symbol may have only a value of '0'.

2 is a diagram illustrating a configuration of a forward link transmitter for a data traffic channel according to an embodiment of the present invention. The forward link transmitter for the data traffic channel transmits the preamble subchannel (PSCH) signal, the data traffic subchannel (DTSCH) signal, and the pilot channel (PICH) signal by time division multiplexing (TDM). It is done.

Referring to FIG. 2, a preamble symbol having a value of '0' is input to a signal point mapper 201 and mapped to '+1'. The output symbol of the signal point mapper 201 is input to a Walsh spreader 202, and a specific 64-ary biorthogonal Walsh code (or index) corresponding to a user's unique MAC identifier (ID) (or index). Or sequence). The Walsh spreader 202 outputs a sequence of a first channel and a sequence of a second channel. The output sequence of the Walsh spreader 202 is input to a sequence repeater 203 and subjected to sequence repetition according to a transmission rate. The sequence repeater 203 allows the output sequence of the Walsh spreader 202 to repeat the sequence up to 16 times according to the transmission rate. Therefore, the PSCH included in one slot of the DTCH may last from 64 chips up to 1,024 chips depending on the transmission rate. The output (I, Q) sequence of the sequence repeater 203 is input to a time division multiplexer 230 and multiplexed with PICH and DTSCH.

The channel coded bit sequence is input to a scrambler 211 and scrambling. The output sequence of the scrambler 211 is input to a channel interleaver 212 and interleaved. In this case, the size of the channel interleaver 212 is also applied differently according to the size of the physical layer packet. The output sequence of the channel interleaver 212 is input to an M-ary symbol modulator 213 and mapped to an M-ary symbol. The M-ary symbol modulator 213 operates as a quadrature phase shift keying (QPSK), a phase shift keying (8-PSK), or a quadrature amplitude modulation (16-QAM) modulator according to a transmission rate, and a physical layer packet unit whose transmission rate can be changed. The modulation method can also be changed. The (I, Q) sequence of M-ary symbols output from the M-ary symbol modulator 213 is input to a sequence repeater / symbol puncturer 214, and the sequence repetition / symbol puncture is performed according to a transmission rate. The (I, Q) sequence of M-ary symbols output from the sequence repetition / symbol puncturer 214 is input to a symbol demultiplexer 215. The (I, Q) sequences of the M-ary symbols input to the symbol demultiplexer 215 are demultiplexed into N Walsh code channels available for DTSCH and output. The number N of Walsh codes used for the DTSCH is variable, and information about this is broadcast through the WSISCH, and the terminal determines the transmission rate of the base station in consideration of this information and requests the base station. Accordingly, the UE can know the allocation status of the Walsh code used for the currently received DTSCH. Output (I, Q) symbols of the symbol demultiplexer 215, which are demultiplexed into N Walsh code channels and output, are input to the Walsh spreader 216 and are spread by a specific Walsh code for each channel. The output (I, Q) sequences of the Walsh spreader 216 are input to a Walsh Channel Gain Controller 217 and are output after gain control. The N output (I, Q) sequences output from the Walsh channel gain controller 217 are input to the Walsh Chip Level Summer 218, added in units of chips, and then output. The (I, Q) chip sequence output from the Walsh chip summer 218 is input to the time division multiplexer 230 and multiplexed with PICH and PSCH.

The pilot symbol may have only a value of '0'. The pilot symbol is input to the signal point mapper 221 and mapped to '+1'. The output symbol of the signal point mapper 221 is input to the Walsh spreader 222. The output symbols of the signal point mapper 221 input to the Walsh spreader 222 are spread by a particular 128-ary Walsh code assigned to the PICH. The output sequence of the Walsh spreader 222 is input to the PICH gain controller 223 and is controlled after gain control. The chip I sequence output from the PICH gain controller 223 is input to the time division multiplexer 230 and multiplexed with a PSCH and a DTSCH.

The time division multiplexer 230 multiplexes the I-channel signal of the PICH, the I-channel signal of the DTSCH, and the I-channel signal of the PSCH and outputs the A-channel signal. The I channel signal of the PICH is an I sequence from the sequence repeater 203, the I channel signal of a DTSCH is an I sequence from the Walsh chip summer 218, and the I channel signal of the PSCH is an output signal of the gain controller 223. The time division multiplexer 230 multiplexes the Q channel signal of the PICH, the Q channel signal of the DTSCH, and the Q channel signal of the PSCH, and outputs the B signal. The Q channel signal of the PICH is the Q sequence from the sequence repeater 203, the Q channel signal of the DTSCH is the Q sequence from the Walsh chip summer 218, and '0' is input to the Q channel signal of the PSCH.

3 is a diagram illustrating a configuration of a forward link transmitter for a data traffic MAC channel according to an embodiment of the present invention.

In FIG. 3, the QMICHs 301 to 304 are subchannels of the DTMACCH for transmitting information on QoS matching used to guarantee different QoS for each data service. Information about QoS matching is provided by 7 bits per slot. Information about the 7-bit QoS matching is input to a channel encoder 301. The channel encoder 301 may use a block code or a convolution code for channel encoding of 7-bit information regarding the QoS matching. As an example, a (24,7) block code may be used as the block code of the channel encoder 301. The output symbols of the channel encoder 301 are input to the signal point mapper 302. The output symbol '0' of the channel encoder 301 is mapped to '+1' by the signal point mapper 302, and the output symbol '1' of the channel encoder 301 is mapped to '-1' by the signal point mapper 302. And output. The output symbols of the signal point mapper 302 are input to the Walsh spreader 303 and spread by a particular 64-ary Walsh code assigned to the DTMACCH. The chip sequence output from the Walsh spreader 303 is input to the gain controller 304 and gain controlled after being output. The output of the gain controller 304 becomes a signal component of I-ch, which is the first channel of the DTMACCH.

RAISCH, which is referred to by reference numerals 311 to 314, is a broadcasting channel for adjusting the traffic load of the reverse link and is a subchannel of the DTMACCH. Information for adjusting the traffic load of the reverse link is provided by 1 bit for each slot. The 1-bit reverse activity indication (RAI) information is input to a symbol repeater 311, and the symbol repeater 311 repeatedly outputs an input symbol four times. The output symbols of the symbol repeater 311 are input to a signal point mapper 312. The symbol '0' among the output symbols of the symbol repeater 311 is mapped to '+1' by the signal point mapper 312, and the symbol '1' is mapped to '-1' by the signal point mapper 312. Is output. The output symbols of the signal point mapper 312 are input to a Walsh spreader 313 and spread by a particular 64-ary Walsh code assigned to the DTMACCH. The chip sequence output from the Walsh spreader 313 is input to the gain controller 314 and gain controlled after being output. The output of the gain controller 314 is input to the time division multiplexer 330 and multiplexed with the WSISCH, which becomes a signal component of Q-ch, which is the second channel of the DTMACCH.

WSISCH, which is formed by reference numerals 321 to 324, is a channel for transmitting information about a base station Walsh space that can be allocated to a DTSCH through dynamic Walsh allocation, which is a subchannel of DTMACCH. For example, if a Walsh code other than the Walsh code assigned to the dedicated circuit physical channel is used in the DTSCH at a spreading factor of 32, up to 28 32-ary Walsh codes may be allowed in the DTSCH. have. As another example, when a Walsh code other than the Walsh code allocated to the dedicated circuit physical channel is used in the DTSCH at the spreading index level of 64, up to 56 64-ary Walsh codes may be used for the DTSCH. As another example, when a Walsh code other than the Walsh code allocated to the dedicated line physical channel is used in the DTSCH at the spreading index level, a maximum of 112 128-ary Walsh codes may be used for the DTSCH. Hereinafter, an example in which a maximum of 28 32-ary Walsh codes are used in the DTSCH using the Walsh codes other than the Walsh codes allocated to the dedicated line physical channel at the spreading index level 32 will be described. If the Walsh code used for the PICH is defined to be used in the DTSCH, information about the Walsh space may be transmitted as 27 bits by using flag bits for each of the remaining 27 32-ary Walsh codes. If the flag bits for 27 Walsh codes are specified to be transmitted by dividing 3 bits per slot over 9 slots, information about the Walsh space is provided by 3 bits per slot.

Information about the 3-bit Walsh space is input to the channel encoder 321. The channel encoder 321 may use a block code or a convolution code for channel encoding of 3-bit information about a Walsh space. For example, a (20,3) block code or a (180,27) block code may be used as a block code of the channel encoder 321 for channel encoding of 3-bit information about Walsh space. The output symbols of the channel encoder 321 are input to the signal point mapper 322. The symbol '0' among the output symbols of the channel encoder 321 is mapped to '+1' by the signal point mapper 322, and the symbol '1' among the output symbols of the channel encoder 321 is the signal point mapper 322. Is mapped to '-1' and output. The output symbols of the signal point mapper 322 are input to a Walsh spreader 323 and spread by a particular 64-ary Walsh code assigned to the DTMACCH. The chip sequence output from the Walsh spreader 323 is input to the gain controller 324 and gain controlled and then output. The output of the gain controller 324 is input to the time division multiplexer 330 and multiplexed with the RAICH, and this multiplexed signal becomes a component of the Q-ch signal, which is the second channel of the DTMACCH.

4 is a diagram illustrating a configuration of a forward link transmitter for a common power control channel (CPCCH) according to an embodiment of the present invention. This transmitter is the transmitter of the forward link to the CPCCH for power control of the physical channel for data services operating in a dedicated circuit on the reverse link.

Through the CPCCH configured as shown in FIG. 4, power for the reverse physical channel may be controlled in units of slots. In this case, the CPCCH is divided into a first channel I-ch and a second channel Q-ch, and transmits power control commands for eight reverse physical channels through the first channel I-ch and the second channel Q-ch. Can be. Power control command bits for eight reverse physical channels are multiplexed on the first channel I-ch of the CPCCH, and power control command bits for eight reverse physical channels are multiplexed on the second channel I-ch. Different initial offsets are given for each of the eight reverse physical channels for multiplexing. Initial offsets 0-7 are given for the first channel I-ch, and initial offsets 8-15 are given for the second channel Q-ch.

The long code generator 401 inputs a long code mask for the CPCCH and generates a long code at a clock of 1.2288 MHz. The output of the long code generator 401 is input to a decimator 402, and the decimator 402 decimates an input symbol and outputs the decimator 402. For example, the decimator 402 may output one symbol for every 192 input symbols. At this time, the output signal of the decimator 402 is driven with a clock 192 times lower than the input signal. The output symbol of the decimator 402 is input to a relative offset calculator 403. The relative offset calculator 403 calculates and outputs a relative offset from the symbol output from the decimator 402.

The multiplexer 411 multiplexes the power control command bits for the eight reverse physical channels using the initial offsets 0-7 for the eight reverse physical channels and the output of the relative offset calculator 403. The multiplexer 411 may output a signal having a data rate of 6400bps. The output symbols of the multiplexer 411 are input to a symbol repeater 412, and the symbol repeater 412 repeats an input symbol three times. Output symbols from the symbol repeater 412 may have 19200 bps. The output symbols of the symbol repeater 412 are input to a signal point mapper 413. The signal point mapper 413 maps and outputs a symbol '0' to '+1' and a symbol '1' to '-1' among the input symbols. In this case, when there is no input symbol, the signal point mapper 413 outputs '0'. The output symbols of the signal point mapper 413 are input to a gain controller 414 and gain controlled. The output symbols of the gain controller 414 are input to a Walsh spreader 415 and spread by a particular 64-ary Walsh code assigned to the CPCCH. The signal output from the Walsh spreader 415 is an I-ch signal, which is the first channel of the CPCCH, and is power control command bits for eight reverse physical channels.

The multiplexer 421 multiplexes the power control command bits for the eight reverse physical channels using the initial offsets 8-15 for the eight reverse physical channels and the output of the relative offset calculator 403. The multiplexer 421 may output a signal having a data rate of 6400bps. The output symbols of the multiplexer 421 are input to a symbol repeater 422, and the symbol repeater 422 repeats the input symbol three times. Output symbols from the symbol repeater 422 may have 19200 bps. The output symbols of the symbol repeater 422 are input to a signal point mapper 423. The signal point mapper 423 maps the symbol '0' to '+1' and the symbol '1' to '-1' among the input symbols. In this case, when there is no input symbol, the signal point mapper 423 outputs '0'. The output symbols of the signal point mapper 423 are input to a gain controller 424 for gain control. The output symbols of the gain controller 424 are input to a Walsh spreader 425 and spread by a particular 64-ary Walsh code assigned to the CPCCH. The signal output from the Walsh spreader 425 is a Q-ch signal, which is a second channel of the CPCCH, and power control command bits for eight reverse physical channels and eight reverse physical channels that are power controlled through the I-ch.

5 is a diagram illustrating a configuration for orthogonal spreading and radio frequency (RF) band frequency transition for a forward link channel according to an embodiment of the present invention. This figure shows an operation of orthogonally spreading various channel signals of the forward link as shown in FIGS. 2 to 4 and transmitting them as a signal suitable for transmission to a terminal by frequency shifting to a signal of an RF band.

Referring to FIG. 5, the first summer 501 is a signal component of I-ch which is a first channel of DTCH, a signal component of I-ch which is a first channel of DTMACCH, and I-ch which is a first channel of CPCCH. The signal components are summed and output. The signal component of I-ch, which is the first channel of the DTCH, is the A output of the multiplexer 230 of FIG. 2, and the signal component of I-ch, which is the first channel of the DTMACCH, is the output of the gain controller 304 of FIG. 3, and the CPCCH The signal component of I-ch, which is the first channel of, is the output of Walsh spreader 415 in FIG. The first summer 501 adds and outputs the input signals of the first channel in units of chips. The second summer 502 sums the signal component of Q-ch, which is the second channel of the DTCH, the signal component of Q-ch, which is the second channel of the DTMACCH, and outputs the signal component of Q-ch, which is the second channel of the CPCCH. do. The signal component of Q-ch, which is the second channel of the DTCH, is the B output of the multiplexer 230 of FIG. 2, and the signal component of Q-ch, which is the second channel of the DTMACCH, is the output of the multiplexer 330 of FIG. The signal component of the second channel, Q-ch, is the output of the Walsh spreader 425 of FIG. The second summer 502 adds and outputs the input signals of the second channel in units of chips.

Quadrature spreader 510 uses a spreading sequence consisting of a first channel (I-ch) spreading sequence and a second channel (Q-ch) spreading sequence to a first summer 501 and a second summer 502. After complex spreading (or complex multiplying) the input signal, the first channel I-ch signal and the second channel Q-ch signal are output. The first channel I-ch signal from the quadrature spreader 510 is inputted to the low pass filter 521 to be low pass filtered. The second channel Q-ch signal from the quadrature spreader 510 is inputted to the low pass filter 522 to be low pass filtered. The output of the low pass filter 521 is input to the frequency shifter 531 and shifted to the RF band by the product of the first frequency cos2fct. The output of the low pass filter 522 is input to the frequency shifter 532 and multiplied by the second frequency sin2fct. Transition to the RF band. Summer 540 sums the output signal of frequency shifter 531 and the output signal of frequency shifter 532. The sum signal by the summer 540 is radiated through an antenna (not shown).

Meanwhile, in the detailed description of the present invention, specific embodiments have been described, but various modifications are possible without departing from the scope of the present invention. Therefore, the scope of the present invention should not be limited to the described embodiments, but should be determined not only by the scope of the following claims, but also by the equivalents of the claims.

As described above, the present invention provides a forward link transmitter having a new channel structure and transmission structure for efficient packet data service in a mobile communication system capable of supporting a multimedia service including a voice service and a data service. Such a forward link transmitter has an advantage of being compatible with a mobile communication system that supports only voice service and simultaneously supporting data service by using the existing 1x bandwidth.

Claims (38)

A forward link transmission apparatus for packet data service in a mobile communication system supporting a multimedia service including voice and data services, the apparatus comprising: A first channel transmitter for time division multiplexing and outputting data traffic, a preamble signal for designating a corresponding terminal to the traffic, and a pilot signal which is an amplitude reference value for synchronous demodulation; Time-division multiplexing information indicating quality of service indication related to quality of service (QoS) matching of traffic, reverse activity indication information for adjusting the traffic load of a reverse link, and Walsh space information of a base station allocated to the traffic; A second channel transmitter for outputting And a third channel transmitter for outputting common power control information for power control of a physical channel for a data service operating in a dedicated line scheme in a reverse link. The method of claim 1, wherein the first channel transmitter, A first signal processor interleaving, symbol modulating, repeating / perforating according to a transmission rate, demultiplexing, and Walsh spreading; A second signal processor to Walsh spread the preamble signal and repeat the preamble signal according to a sequence rate; A third signal processor for Walsh spreading the pilot signal; And a multiplexer for time division multiplexing and outputting the processed signals to each signal processor. The method of claim 2, wherein the first signal processor, A scrambler that scrambles bits of the channel encoded traffic; An interleaver for interleaving the output of the scrambler; A symbol modulator for symbol modulating the output of the interleaver; A repeater / puncturer for repeating / punching the output of the symbol modulator according to the transmission rate; A demultiplexer for demultiplexing the output of the repeater / puncturer; A Walsh diffuser for Walsh spreading the output of the demultiplexer; And a summer for chip level summing the output of the Walsh diffuser. The method of claim 3, wherein the first signal processor, And a gain controller connected between the Walsh diffuser and the summer, the gain controller controlling the gain of the output of the Walsh diffuser. The method of claim 2, wherein the second signal processor, A signal point mapper which maps the preamble signal to a signal point; A Walsh spreader for Walsh spreading the output of the signal point mapper, And a sequence repeater for repeating the output of the Walsh spreader according to the sequence rate. The method of claim 2, wherein the third signal processor, A signal point mapper which maps the pilot signal to a signal point; And a Walsh spreader for Walsh spreading the output of the signal point mapper. 7. The apparatus of claim 6, wherein the third signal processor further comprises a gain controller that controls the gain of the output of the Walsh spreader. The method of claim 1, wherein the second channel transmitter, A first signal processor for channel coding the quality of service indication information and Walsh spreading; A second signal processor for repeating the reverse activity indication information and Walsh spreading; A third signal processor for channel coding the Walsh spatial information and spreading the Walsh space; And a multiplexer for time division multiplexing the output of the second signal processor and the output of the third signal processor. The method of claim 8, wherein the first signal processor, A channel encoder for channel encoding the quality of service indication information; A signal point mapper for mapping the output of the channel encoder to the signal point; And a Walsh spreader for Walsh spreading the output of the signal point mapper. 10. The apparatus of claim 9, wherein the first signal processor further comprises a gain controller that controls the gain of the output of the Walsh spreader. The method of claim 8, wherein the second signal processor, A repeater for repeating the reverse activity indication information; A signal point mapper for mapping the output of the repeater to a signal point; And a Walsh spreader for Walsh spreading the output of the signal point mapper. 12. The apparatus of claim 11, wherein the second signal processor further comprises a gain controller for controlling the gain of the output of the Walsh spreader. The method of claim 8, wherein the third signal processor, A channel encoder for channel encoding the Walsh spatial information; A signal point mapper for mapping the output of the channel encoder to the signal point; And a Walsh spreader for Walsh spreading the output of the signal point mapper. 14. The apparatus of claim 13, wherein the third signal processor further comprises a gain controller that controls the gain of the output of the Walsh spreader. The method of claim 1, wherein the third channel transmitter, A long code generator for generating a long code for common power control, A decimator for decimating the long code, A calculator for calculating a relative offset with respect to the output of the decimator, A first common power control information generator for multiplexing the relative offset and the first initial offset, and symbolly repeating the multiplexing result and spreading the Walsh to output first common power control information; And a second common power control information generator for multiplexing the relative offset and the second preset initial offset, symbolly repeating the multiplexing result, and Walsh spreading to output second common power control information. The method of claim 15, wherein the first common power control information generator, A multiplexer multiplexing the relative offset and the first initial offset; A symbol repeater for symbol repeating the output of the multiplexer; A signal point mapper which maps an output of the symbol repeater to a signal point; And a Walsh spreader for Walsh spreading the output of the signal point mapper. 17. The apparatus of claim 16, wherein the first common power control information generator further comprises a gain controller connected between the signal point mapper and the Walsh spreader and controlling the gain of the output of the signal point mapper. The apparatus described above. The method of claim 15, wherein the second common power control information generator, A multiplexer multiplexing the relative offset and the second initial offset; A symbol repeater for symbol repeating the output of the multiplexer; A signal point mapper which maps an output of the symbol repeater to a signal point; And a Walsh spreader for Walsh spreading the output of the signal point mapper. 19. The apparatus of claim 18, wherein the second common power control information generator further comprises a gain controller connected between the signal point mapper and the Walsh spreader, the gain controller controlling the gain of the output of the signal point mapper. The apparatus described above. A forward link transmission method for packet data service in a mobile communication system supporting a multimedia service including voice and data services, the method comprising: A first channel transmission process of time-division multiplexing data traffic, a preamble signal for designating a corresponding terminal for the traffic, and a pilot signal, which is an amplitude reference value for synchronous demodulation, and outputting the same; Time-division multiplexing information indicating quality of service indication related to quality of service (QoS) matching of the traffic; A second channel transmission process of outputting And a third channel transmission process of outputting common power control information for power control of a physical channel for a data service operating in a dedicated line scheme in a reverse link. The method of claim 20, wherein the first channel transmission process, A first signal processing process for interleaving the traffic, symbol modulation, repeating / perforating according to a transmission rate, demultiplexing, and Walsh spreading; A second signal processing step of spreading the preamble signal by Walsh and repeating the preamble signal according to a sequence rate; A third signal processing step of Walsh spreading the pilot signal; And time-division multiplexing and outputting the processed signals to each signal processor. The method of claim 21, further comprising: processing the first signal; Scrambling bits of said channel encoded traffic; Interleaving the output of the scrambler; Symbol modulating the output of the interleaver; Repeating / punching the output of the symbol modulator according to the rate; Demultiplexing the output of the repeater / perforator; Walsh spreading the output of the demultiplexer; And chip level summing the output of the Walsh diffuser. 23. The method of claim 22, wherein said first signal processing further comprises controlling a gain of said Walsh spread processed output. The method of claim 21, wherein the second signal processing process, Mapping the preamble signal to a signal point; Walsh spreading the output of the signal point mapper; Repeating the output of the Walsh spreader according to the sequence rate. The method of claim 21, wherein the third signal processing process, Mapping the pilot signal to a signal point; And Walsh spreading the output of the signal point mapper. 27. The method of claim 25, wherein the third signal processing further comprises controlling a gain of an output of the Walsh spreader. The method of claim 20, wherein the second channel transmission process, A first signal processing process of channel coding the quality of service indication indication information and Walsh spreading; A second signal processing step of repeating the reverse activity indication information and Walsh spreading; A third signal processing process of channel coding the Walsh spatial information and Walsh spreading; And time-division multiplexing the output of the second signal processor and the output of the third signal processor. The method of claim 27, wherein the first signal processing process, Channel coding the quality of service indication information; Mapping signal output of the channel encoder to a signal point; And Walsh spreading the output of the signal point mapper. 29. The method of claim 28, wherein the first signal processing further comprises controlling a gain of the Walsh spread output. The method of claim 27, wherein the second signal processing process, Repeating the reverse activity indication information; Mapping the output of the repeater to a signal point; And Walsh spreading the output of the signal point mapper. 31. The method of claim 30, wherein the second signal processing further comprises controlling a gain of the Walsh spread output. The method of claim 27, wherein the third signal processing process, Channel coding the Walsh spatial information; Mapping the output of the channel encoder to signal points; And Walsh spreading the output of the signal point mapper. 33. The method of claim 32, wherein said third signal processing further comprises controlling the gain of said Walsh spread output. The method of claim 20, wherein the third channel transmission process, Generating a long code for common power control, Decimating the long code, Calculating a relative offset with respect to the output of the decimator, A first common power control information generation process of multiplexing the relative offset and the first initial offset preset, symbol repeating the multiplexing result, and Walsh spreading to output first common power control information; And generating second common power control information by multiplexing the relative offset and the second preset initial offset, symbolly repeating the multiplexing result, and Walsh spreading the second common power control information. The process of claim 34, wherein the first common power control information generation process comprises: Multiplexing the relative offset and the first initial offset; Symbolly repeating the output of the multiplexer; Mapping the output of the symbol repeater to a signal point; And Walsh spreading the output of the signal point mapper. 36. The method of claim 35, further comprising the step of generating the first common power control information and controlling the gain of the signal point mapped output. 35. The method of claim 34, wherein the second common power control information generation process comprises: Multiplexing the relative offset and the second initial offset; Symbolly repeating the output of the multiplexer; Mapping the output of the symbol repeater to a signal point; And Walsh spreading the output of the signal point mapper. 38. The method of claim 37, wherein the generating of the second common power control information further comprises controlling a gain of the signal point mapped output.