KR20020065824A - Apparatus and method for transmitting data of multi-media in mobile communication system - Google Patents

Abstract

PURPOSE: An apparatus and method for transmitting multimedia data in a mobile communication system is provided to be suitably adapted to the situation of a channel and smoothly support a service for requesting various QoS(Quality of Service) by applying an MQC(Multiple Quality Control channel) concept for transmitting a packet which requests an inter-different transmission dominance and a QoS in one application service to an asynchronous transmission scheme. CONSTITUTION: An RLP(Radio Link Protocol) layer forms a logic channel of data transmitted by each service according to a class of an application service stream. A multiplexing layer(110) multiplexes the data outputted from the RLP layer according to QoS by a transport unit and outputs the multiplexed data. A DRQ(Data Rate reQuest) controller(170) receives a DRQ value transmitted from a terminal and outputs the received DRQ value. A transmitting/receiving request controller(180) generates transmitting and receiving request signals of transmitted data and outputs the generated transmitting and receiving request signals. A controller determines a mapping value and a redundancy value according to the quality of the transport unit data. MQCs adds a CRC(Cyclic Redundancy Check) code to each transport unit data, and performs an encoding, a redundancy selection, and a mapping according to the QoS. A physical channel serial concatenation(140) combines the outputs of quality channels in serial for converting the outputs of the quality channels into transmitting data.

Description

Apparatus and method for transmitting multimedia data in mobile communication system {APPARATUS AND METHOD FOR TRANSMITTING DATA OF MULTI-MEDIA IN MOBILE COMMUNICATION SYSTEM}

The present invention relates to a mobile communication system capable of providing a multimedia data service, and more particularly, to a system capable of providing a service according to transmission order and quality of service in a mobile communication system capable of providing a multimedia data service.

In general, mobile communication systems have been developed to secure mobility of users. The mobile communication system starts from a basic voice service and is recently progressing in a form that can accommodate a data service and a high speed data service. A typical system in such a mobile communication system is a code division multiple access (CDMA) mobile communication system. Much research has been conducted to enable high-speed data transmission in the code division multiple access mobile communication system.

Recently, in order to supplement the shortcomings of the 1XEV-DO system (HDR (High Data Rate) system), which is a packet data transmission system, a new research is being conducted in the 3rd Generation Partnership Project 2 (3GPP2).

The research is progressing to provide a system that can be used not only for high-speed data transmission but also for services requiring real time such as voice. In other words, research is being conducted toward providing a multimedia service. In order to support multimedia services, several new technologies need to be combined.

On the other hand, the recent trend is becoming clear that even in the case of the general Internet protocol, it is necessary to separate and process packets that require different transmission importance and real-time. However, currently implemented mobile communication systems do not consider much of the above trends and process all packets with the same transmission superiority and quality of service (QoS) requirements. There are various attempts to implement hybrid ARQ (HARQ) technique applied to the mobile communication system as efficiently as possible. This will be described with reference to FIG. 1.

1 is a timing diagram for transmitting data using a HARQ scheme in a synchronous transmission scheme. The method illustrated in FIG. 1 will be described below.

Basically, data (n, n + 1, n + 2, n + 3, ..., n + 8) requiring data transmission is sequentially transmitted in the order of transmission. In addition, the data is not received or the abnormal reception signal (NACK) is not received within a predetermined time, for example, after the transmission is made, for example, a time period for receiving a normal reception signal (ACK) or an abnormal reception signal (NACK). If received, retransmission is made for data for which an abnormal reception signal (NACK) has been received or for which no signal has been received. That is, the method of FIG. 1 is a synchronous transmission method, in which a packet is retransmitted at a predetermined time point.

Next, a large amount of data transmission according to the asynchronous transmission method will be described with reference to FIG. 2. 2 is a timing diagram for transmitting data using an HARQ scheme in an asynchronous transmission scheme. In the method of FIG. 2, when transmitting the generated data, when a response to the transport packet is received, retransmission is performed according to a channel condition. That is, when an abnormal reception signal (NACK) is received after data to be transmitted (n, n + 1, n + 2, n + 3, ...) is transmitted, retransmission is performed when the channel is in good condition. .

In addition, in the structure of FIG. 2, data may be transmitted through the method of FIG. 3. 3 is a conceptual diagram of an apparatus for performing puncturing and repetition of data in which retransmission is performed according to various data rates. As shown in FIG. 3, the transmitted data may be converted into data of various codes through repetition and puncturing of coded symbols coded by an encoder and transmitted. That is, as shown in FIG. 3, the input packet is configured to have input packets of various sizes (768/1536/3072/7680 bits, etc.) according to channel conditions. It is also transmitted through an appropriate modulation scheme (QPSK / 8PSK / 16QAM) to support the transmission of the packet data.

The method of FIG. 1 described above is configured to continuously perform retransmission even when the channel condition is not good, resulting in waste of resources. The method of FIG. 2 described above has a problem that it cannot be used for data requiring real time.

On the other hand, the HDR system proposed to transmit data at high speed has the same level of quality of service (QoS) for data information transmitted on the same physical channel. Therefore, it is not possible to control QoS according to the importance between each input data or between respective parts of the same input data. For example, when various services such as an internet data service, a voice service, and a multimedia service are simultaneously performed, QoS cannot be applied differently according to each service. Therefore, HDR systems cannot provide different QoS between intra-media.

In addition, while providing the multimedia services requiring the various qualities, it should be able to dynamically provide transmission data according to the environment of the channel and the characteristics of the application service. However, the above systems cannot provide multimedia services that provide various qualities. Therefore, the above systems have a problem that the transmission data cannot be dynamically provided according to the characteristics of the channel environment and the application service together with the multimedia service of various quality.

Accordingly, an object of the present invention is to provide an apparatus and method capable of performing efficient retransmission while dynamically providing transmission data according to the characteristics of a multimedia service in a mobile communication system.

Another object of the present invention is to provide a multimedia service, and to provide an apparatus and method for a mobile communication system capable of retransmitting data in a synchronous or asynchronous manner.

An apparatus of the present invention for achieving the above objects is a device for transmitting multimedia data in a mobile communication system, radio link protocol layer for forming a logical channel according to the class of the application service stream to transmit data according to each service, A multiplexing layer for multiplexing and outputting data output from the radio protocol layer in transmission units according to a quality of a service; a data request rate controller for receiving and outputting a data request rate (DRQ) value transmitted from a terminal; A transmission / reception request controller for generating and outputting data transmission and reception request signals, a controller for determining and outputting mapping values and redundancy values according to the quality of the transmission unit data, and a code for checking the transmission unit data , Encoding, redundancy selection and service offerings And the channel quality (MQC) that maps to the output in accordance with, is composed of a series combination to convert transmit data to the series combination of the outputs of the channel quality is characterized in that it transmits data.

In addition, the preamble of the transmitted data can be transmitted including the value of the coded symbol.

The controller;

When the real time of the data to be transmitted is required, the transmission unit may be set to a packet having a size that can accommodate the real time, and if the data of the transmission unit require different quality of service, The mapping value and the redundancy value may be determined and output.

In addition, when retransmission is required, the retransmission rate may be determined according to the coded symbol value inserted into the preamble from the terminal.

1 is a timing diagram for transmitting data using a HARQ scheme in a synchronous transmission scheme;

2 is a timing diagram for transmitting data using an HARQ scheme in an asynchronous transmission scheme,

3 is a conceptual diagram of an apparatus for performing puncturing and repetition of data in which retransmission is performed according to various data rates;

FIG. 4 is a block diagram illustrating each layer of a basic transmitter / receiver according to an exemplary embodiment of the present invention.

5 is a flowchart of a process of constructing an input packet and generating a TU which is an input of an MQC channel;

FIG. 6 is a flowchart for generating a subpacket having a different coding rate for adaptive transmission of a TU input to each MQC channel. FIG.

7 is a flowchart illustrating a case in which a subpacket is generated during retransmission for adaptive transmission of a TU input to each MQC channel;

8A is a diagram illustrating the structure of a channel in the case where all configurations of the identifier table according to the present invention are configured as preambles;

8B illustrates the structure of a channel when the configuration of the identifier table according to the present invention sends a QMI to a coding channel separate from the preamble.

Hereinafter, exemplary embodiments of the present invention will be described in detail with reference to the accompanying drawings. First of all, in adding reference numerals to the components of each drawing, it should be noted that the same reference numerals have the same reference numerals as much as possible even if displayed on different drawings. Also, in the following description, many specific details such as components of specific circuits are shown, which are provided to help a more general understanding of the present invention, and the present invention may be practiced without these specific details. It is self-evident to those of ordinary knowledge in Esau. 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.

Detailed operation and structure of the present invention will be described with reference to the accompanying drawings.

4 is a block diagram of each layer of a basic transmitter / receiver according to an exemplary embodiment of the present invention. Hereinafter, the configuration of a transmitter / receiver according to a preferred embodiment of the present invention will be described in detail with reference to FIG. 4.

The configuration of FIG. 4 shows interfaces and functional blocks of an RLP layer, a MUX layer, and a physical layer, which are upper layers. FIG. 4 is a protocol structure for providing different QoS using physical layer subchannels, and illustrates a structure in which pure user information is transmitted instead of user plane, that is, control information. In the case of indicating a control plane, logical channels are mapped to specific control channels, and physical layer subchannels are mapped 1: 1 to specific logical channels. Each functional block can be applied to the control plane as it is.

Next, operations of each part according to the configuration of FIG. 4 will be described in detail below.

The RLP layer (RLP0, RLP1, RLP2, ..., RLP M-2, RLP M-1) 100 forms a logical channel that can be determined according to the class of the application service stream. Accordingly, the RLP layer 100 may be configured with a plurality of logical channels according to the class of the application service. Each logical channel may be provided with an independent RLP or one RLP. When each independent RLP is provided, an RLP instance may be generated as many as the number of classified logical channels. In this case, the RLP provides a management and segmentation function of a sequence number of data transmitted through each logical channel. However, when one RLP manages a plurality of logical channels, it is necessary to manage comprehensive logical channels rather than independent logical channels. Therefore, different RLP functions are required than in the independent case. In the following description, an independent RLP is provided for each logical channel as an example. The transmission unit of the data transmitted through the logical channel may be determined according to the source data rate generated from the application service, and the transmission unit of the configured data is larger than the transmission unit provided by the physical layer sub-channel. It is small or of equal size. The data configured as described above is transferred to the MUX layer 110.

The MUX layer 110 provides a mapping function between logical channels and physical layer subchannels. The logical channel input to the MUX layer 110 is mapped to the physical layer subchannel through three functions as follows.

(1) Multiplexing functionality: If the length of data transmitted from the logical channel is smaller than the data unit (TU: transport unit) transmitted to the physical layer subchannel, another logical channel is configured to form a fixed length data unit. It is assembled with data transmitted through.

(2) Switching functionality: If the length of data transmitted from a logical channel is the same as the length of a TU transmitted to a physical layer subchannel, the specific physical layer without assembly with data transmitted to other logical channels. It may be mapped to a subchannel. In addition, it is possible to map data generated from logical channels having the same or similar QoS to physical layer subchannels that provide a specific QoS, or to appropriately distribute data transmitted from logical channels to always activate the physical layer subchannels. to provide.

(3) QoS control functionality: Data transmitted on a logical channel may be transmitted on a physical layer subchannel according to transmission priority. In this case, the assigned priority may be determined according to the characteristics of the logical channel, and may be applied when control information is transmitted together with user data information or signaling information for transmitting system information is transmitted along with other data information.

Each transmission unit (TU0, TU1, ...) represents a physical layer subchannel. Each of the transmission units becomes a channel through which data generated in the RLP layer 100 is transmitted through the MUX layer 110. Accordingly, each physical layer subchannel may be composed of a plurality of channels. Each transport unit (TU) constituting the physical layer subchannel may have a different quality of service (QoS) guaranteed according to a functional block provided in the physical layer. In addition, the length of the transmission unit transmitted to the physical layer subchannel may be set differently according to the case of the forward and the reverse direction. The forward / reverse direction may consist of a fixed length TU or a variable length TU, and the forward direction consists of a fixed length TU and the reverse direction of a variable length TU, or the forward direction of a variable length TU or the reverse direction of a fixed length It may be configured as a TU. The physical layer subchannels, in which QoS may be differently set by functional blocks provided in the physical layer, may be mapped to TUs generated through the MUX layer 110. The QoS of the transmitted TU may determine the actual QoS of the physical layer subchannel according to an assigned value of QM (QoS Matching) which is a function of the physical layer.

Each of the TUs is matched with one channel, and the subsequent operations perform the same operation according to each QoS. Hereinafter, the transmission units (TU0) 120 mapped to one channel will be examined. That is, each channel provides different QoS and performs the same configuration and operation.

The size of the input packet processed by the MUX layer 110 may be determined according to a service or cell environment (state of cell power, walsh resources, etc.) or each time a new packet is transmitted. When the size of the input packet is determined, the number of TUs is automatically allocated, and each TU enters a multiple quality control channel (MQC), which is appropriate for the corresponding quality of service. As described above, the size (195/384/768/1536/2048/3072) of the data block generating multiple information sources (RLP frames) can be adjusted to fill a fixed TU. In this case, when only a data block having a size smaller than the TU needs to be transmitted, the data can be transmitted even if the TU cannot be filled.

In an embodiment of the present invention, a data block of an input packet is mapped to a TU allocated to one MQC channel. Adjust the size of the input packet to be a multiple of TU. The adjusted TU is divided into inputs of several MQC channels.

The MQC channel 130 matching the TU0 120 includes the CRC 131, the channel coder 132, the redundancy selectors 133a, 133b, 133c, and 133d and the respective QM units 134a, 134b, 134c, and 134d. It is provided. The CRC 131 added to each TU may be used as a retransmission unit according to a transmission scheme provided by a lower layer, that is, ARQ.

In addition, the data processed by the CRC 131 is input to the channel coder 132. The channel coder 132 may be configured as a turbo encoder. In the following description, it is assumed that the channel coder 132 is configured as a turbo encoder. TUs transmitted on different physical layer subchannels are transmitted to respective turbo encoders. The turbo encoder 132 encodes the input TU, and the coding rate may be applied differently for each TU transmitted to each physical layer subchannel. Alternatively, the coding rate may be equally applied to all TUs. In another method of retransmission using HARQ, when retransmission due to an error of initially transmitted data, a coding rate may be determined to be different from the initial transmission.

Redundancy selection units (Redundanct Selection) (133a, 133b, 133c, 133d) may be useful when using the HARQ Type II / III (Hybrid ARQ) as a link transmission method. For example, when retransmission is failed after initial transmission (in the present invention, retransmission between TUs is possible), a combining performance of a receiver is transmitted by transmitting a redundancy matrix different from the initial transmission, that is, a supplementary code. Used to raise In addition, in the present invention, the same TU may be configured to perform different repetition and puncturing processes to generate transmission symbols of various sizes. The additional code used above must specify a complex additional code that can have complementarity in each repetition and puncturing as well as the retransmission order. This is because each TU must undergo a different repetition and puncturing process.

In the above-described process, a coded symbol capable of supporting a corresponding data rate should be generated according to a data rate request (DRQ) transmitted from a terminal. To this end, it receives the DRQ of the terminal and delivers it to the controller 160, and generates transmission symbols according to the scheduling result. If retransmission is requested from the terminal, the DRQ controller 170 which receives the retransmission is combined to generate a coded symbol having an appropriate data rate by combining the results of the DRQ.

QMs (QoS Matching) 134a, 134b, 134c, 134d substantially provide different QoS to each TU. That is, the value of QM is appropriately adjusted using puncturing and repetition. This will be described in more detail below. The value of QM is a value that can be assigned to a fixed value or dynamically provided when a channel is established. When the QM value is fixed, it is determined when the channel between the base station and the mobile station is set for data transmission. On the other hand, when the QM value changes dynamically, the QM value is transmitted to the receiver through the control channel when each TU is transmitted. The QM value that is assigned to a fixed value or that can change dynamically during initial transmission or retransmission is a relative value between physical layer subchannels and is used as an important parameter for differently setting the quality of the physical layer subchannels according to the characteristics of the application service. do.

Coded symbols generated for each MQC channel are determined based on the transmission rate transmitted from the terminal and transmit corresponding subpackets. In this case, determining an appropriate subpacket based on the DRQ value transmitted from the terminal to the base station is performed through an initial / retransmission subpacket transmission rate controller 160. In this case, the transmission rate is determined in consideration of the resources (eg Walsh / power) of the base station.

The MQC 130 is configured to generate multiple transmission symbols to support various subpacket transmission rates. However, the ratio of weight applied to each MQC channel is always processed equally for one input packet. Through this, one transmission symbol supporting the same transmission rate among various types of transmission symbols for each MQC channel for each subpacket transmission rate is selected and outputted to the physical channel serial combiner 140.

Physical Channel Serial Concatenation (140) performs a previous operation for inputting TUs into the channel interleaver. That is, the data received through each MQC channel are serially combined and output to the channel interleaver 150. In this way, the data inputted to the channel interleaver 150 is channel interleaved and then mapped to a transmission slot of a physical channel. The mapped data is transmitted through the physical channel.

The generation of the QM value is performed in the controller 160 and is determined according to the type and transmission speed of the data to be transmitted, which may use values as shown in Table 1 below. Table 1 below uses QMI to support 384 or 192 bits in order to be able to transmit small packet data.

QMI QMI 1 QMI 2 QMI 3 QMI 4 Number of TUs Number of Info Sources One 00000 1.0 1 TU 1RLP 2 0001 1.0 1.0 2 TU 3 00010 1.0 1.0 1.0 3 TU 4 00011 1.0 1.0 1.0 1.0 4 TU 5 00100 1.0 1 TU 2RLP 6 00101 1.2 0.8 2 TU 7 00110 1.2 0.6 1.2 3 TU 8 00111 1.2 0.9 0.9 9 01000 1.3 0.9 0.9 0.9 4 TU 10 01001 1.1 0.7 1.1 1.1 11 01010 1.2 0.8 1.2 0.8 12 01011 1.0 1 TU 3RLP 13 01100 1.2 0.8 2 TU 14 01101 1.2 1.0 0.8 3 TU 15 01110 1.1 1.0 0.8 1.1 4 TU 16 01111 1.2 1.0 0.8 1.0 17 1000 1.4 1.0 0.8 0.8 18 10001 1.2 One One 0.8 4 TU 4RLP 19 10010 1.0 0 0 0 1 / 2TU 1RLP 20 10011 1.0 0 0 0 1/4 TU 4RLP

When the asynchronous rate adaptive retransmission scheme is used, the retransmission packet is a value obtained by encoding the same input packet. However, retransmission symbols of various sizes are generated through repetition and puncturing to support different transmission rates in retransmission. Therefore, in the present invention, the number of TUs constituting the transmission symbol is determined according to the size of the input packet. That is, when the size of the input packet entering the encoder is determined, the number of TUs is determined accordingly. When the number of TUs is determined, the QMI value to be applied is determined accordingly.

The principle of constructing QMI values is to ensure that values delivered from information sources with the same grade have the same weight. According to the transmission rate, the data remaining in the packet is filled with the TU delivered from the higher level information source. However, when the data generation rate of the lower level information source is fast, the data of the lower level information source is filled first. The weight is adjusted so that the sum of processed symbols in the QM block of each TU is equal to the interleaver size based on the interleaver size possible at each transmission rate.

When retransmitting HARQ, the same QMI (Quality Matching Index) may be transmitted in the forward and reverse directions, respectively, or may be transmitted by applying different QMI. It can work as determined which option to use when setting up the initial service environment. In case of retransmission, since retransmission is possible for each TU, one of the appropriate initial negotiated QM values may be indexed or the same weight may be used for each TU position.

In the asynchronous transmission scheme of the HARQ, the QMI for the retransmission packet may be the same as the synchronous transmission scheme, or may be transmitted using different weights when retransmitting. At this time, the criteria for allocating the QMI depends on the size of the input packet. In the present invention, it is assumed that the service negotiation process of the IS-2000 system is used in setting up a service to select a type of QM value to be used in a corresponding application service or an operation of a QM to be used for retransmission of HARQ. In the case of the QM value, different QoS parameters may be required for each corresponding application service, and an appropriate value may be used according to a situation in the current cell area.

5 is a flowchart illustrating a process of constructing an input packet and transmitting the input packet to a TU which is an input of an MQC channel. The operation of the MUX & QoS layer is described in the structure shown in FIG.

Hereinafter, a process of generating a TU according to the present invention will be described in detail with reference to FIGS. 4 to 5. The configuration of FIG. 4 may be used in common for the base station and the terminal. However, in the embodiment of FIG. 5, it is assumed that the flow is processed in the base station.

In step 200, the number of services having various grades is identified. The number of services refers to data in which data shown in PPP in FIG. 4 are input to RLPs. That is, in step 200, the number of data to be transmitted and a service grade according to each data are checked. And check the QoS requirements of the application service for each data to be transmitted. Thereafter, the process proceeds to step 202 to check the number of users currently in service, superiority, or available resources (walsh, power state) of the current base station. In step 204, the size of the input packet of the data to be transmitted is determined according to the check result of the steps 200 and 202. The input packet is determined at one of 384/768/1536/3072 according to the transmission rate and the serviceable state. In this case, in case of a service requiring real time operation, a small sized input packet may be generated and transmitted according to a parameter such as a delay required. In addition, when a service that allows a certain amount of delay is added, it is configured to transmit large packets at once. In this way, the real-time and resources of the transmitted data can be used efficiently. The above criteria may be changed depending on the type of service and the needs of the operator.

If the size of the input packet is determined in step 204, the flow proceeds to step 206 to generate a data block for each stream to fit the determined input packet to the size of the TU. In this case, the sum of each generated TU is equal to the determined size of the input packet, and if possible, the same service mapping for each TU. However, if the same service is not mapped for each TU, two or more different streams may configure one TU. In step 208, if the input packet is completed according to the size, the process proceeds to step 210; otherwise, the process proceeds to step 204 to process the input data.

When generation of the stream is completed through the above-described process, in step 210, each TU is sent to the MQC channel. Here, each MQC channel guarantees different transmission quality. The mapping of each TU acts as a transmission advantage between services based on this. A unit of the TU transmitted in the above process may be configured to 768 bits. However, transmission of smaller transmission units is possible and larger units are possible. If only a packet smaller than 768 is waiting for transmission, transmission of a packet smaller than that is also supported (192/384 bits).

In the above, determining the size of the subpacket symbol according to the transmission rate is determined by looking at the DRQ. The value returned through the DRQ feedback enters the controller and determines the size of the symbol to be generated based on the resource status of the base station. At this time, the controller inputs this value to each MQC channel to generate an appropriate symbol. The retransmission request block checks the ACK / NAK value coming from the terminal and raises the retransmission request to the controller. In this case, the controller determines the transmission rate in consideration of the DRQ value and lowers the corresponding parameter to each block.

FIG. 6 is a flowchart of generating sub-packets having different coding rates for adaptive rate transmission of TUs input to each MQC channel. Hereinafter, a process of generating a subpacket having different coding rates for adaptive transmission according to the present invention will be described in detail with reference to FIGS. 4 to 6.

In step 300, each TU processed through FIG. 5 is received for each MQC channel, and CRC is inserted and then encoded. In this case, the coding rate may be defined in various ways to support various transmission states. Thereafter, in step 302, an iteration, a puncturing process, or a redundancy selection process is performed to support various data rates. This is to support various subpacket transmission rates combined with the encoding process. In operation 304, a symbol supporting multiple data rates is generated through the redundancy selection process. At this time, the generated symbols should be generated to support all transmission rates within the maximum transmission rate supported according to the size of the input packet.

After performing the above processes, the process proceeds to step 306 to perform QM for each MQC channel, which is a function to be supported by the present invention. This is to perform a repetition and puncturing process by varying weights for different MQC channels with respect to the coded symbols as described above, and different reception probability for each TU. At this time, the MQC channel, which has a relatively superior weight, has a relatively large weight and is adjusted to increase the relative reception probability.

In this case, if an abnormal reception signal (NACK) is received from the mobile terminal, HARQ retransmission is performed. In the case of retransmission, transmission is performed to support DRQ according to a symbol of a transmission rate requested from the mobile terminal. A successful TU in retransmission for each TU may be configured to repeat the symbol of the failed TU once excluded from the retransmission target. That is, it can be configured to retransmit only the TU that requires retransmission. The retransmitted symbols must each perform self-decodable.

The normal case then continues. In step 306 to step 308, the DRQ received from the mobile station is examined. In step 310, a symbol having an appropriate size is selected to support the transmission rate of the checked DRQ. Steps 308 and 310 perform the same operation for each MQC channel. In operation 312, the TUs of the MQC channels are combined, and the outputs of the respective MQC channels are connected to the interleaver 150. In step 314, the interleaver interleaves it and transmits it.

7 is a flowchart illustrating a case of generating a subpacket upon retransmission for adaptive rate transmission of a TU input to each MQC channel. Hereinafter, a process of generating a subpacket upon retransmission for adaptive transmission of TUs input to an MQC channel according to the present invention will be described in detail with reference to FIGS. 4 to 7. 4, the configuration of the MQC will be described with reference to the MQC 130 of CH0.

In step 400, each TU output through the process of FIG. 5 is received through an MQC channel. Then, CRC is attached and encoding is performed. In step 402, since retransmission is being performed, the DRC transmitted from the UE is received. Check the received DRC. The retransmission data is allocated a transmission order through scheduling. The process proceeds to step 404 to perform an iteration and puncturing process or a redundancy selection process. This is performed in one of the redundancy selectors 133a, 133b, 133c, and 133d, and the various redundancy selectors are required to select redundancy according to each data rate. This ensures complementarity in retransmission.

Thereafter, the process proceeds to step 406 to generate the coded symbols of the subpacket for transmission through the above-described process. In step 408, QM matching is performed for each MQC channel. This is to perform a repetition and puncturing process by varying weights for different MQC channels with respect to the coded symbol to change the reception probability for each TU. Thereafter, the process proceeds to step 410 to select the subpacket of the TU according to the transmission rate. In step 412, the serial combination unit 140 serially combines MQC channels according to TUs and outputs the serial combinations to the channel interleaver 150. The channel interleaver 150 then interleaves and transmits them.

When the UE receives the abnormal reception signal (NACK) after performing step 400, since retransmission is requested from the terminal, the above-described processes may be performed whenever retransmission is performed according to the corresponding transmission rate. Successful TUs for each TU retransmission are excluded from the retransmission target. And the transmission repeats the symbol of the failed TU. In addition, the retransmitted symbols must each be self-decodable.

In order to perform the above process, various identifiers required for transmitting encoded symbols may be generated. If a change in the number of bits is required when transmitting the code symbol, each identifier may be transmitted through a preamble of a subpacket for each transmission according to the characteristics of the physical channel. Alternatively, the identifier may be transmitted through a separate physical channel. Table 2 below is a table added with identifiers and descriptions thereof. In the following description, the following Table 2 is referred to as an identifier table.

Identifier Explanation beat Sub-Packet Sequence Number (SPSN) Identifies the order of retransmission packets (separate initial / retransmission) 2 bits Input Pcaket Index (IPI) Identify input packets during continuous transmission (supports asynchronous transmission) 2 bits Quality Matching Index (QMI) Identifies weight ratio of quality mating 5-7 buts

In addition, the transmission / reception side may be configured to always have the same expected identifiers for the retransmitted symbols to prevent malfunction. The configuration of the identifiers and the transmission frame is shown in FIGS. 8A to 8B.

8A is a diagram illustrating a case in which all of the configuration of the identifier table is configured as a preamble, and FIG. 8B is a diagram illustrating a case where the configuration of the identifier table sends QMI in a coding channel separate from the preamble. 8A to 8B can be configured to smoothly transmit data between the base station and the mobile terminal through the identifier.

As described above, in the present invention, by applying the MQC concept for transmitting packets requiring different transmission superiority and quality of service in one application service to the asynchronous transmission method, the service requiring various quality of service by appropriately adapting to the channel situation It will be able to support smoothly.

Claims (15)

An apparatus for transmitting multimedia data in a mobile communication system, A radio link protocol layer for forming a logical channel according to the class of the application service stream for data to be transmitted according to each service; A multiplexing layer for multiplexing and outputting data output from the radio protocol layer into a transport unit according to a quality of service; A data request rate controller for receiving and outputting a data request rate (DRQ) value transmitted from the terminal; A transmission and reception request controller for generating and outputting transmission and reception request signals of the transmitted data; A controller for determining and outputting a mapping value and a redundancy value according to the quality of the transmission unit data; Multiple quality control channels (MQCs) for adding a code (CRC) for checking to each transmission unit data and mapping and outputting them according to encoding, redundancy selection, and quality of service; And a serial combination unit for serially combining the outputs of the quality channels and converting the outputs of the quality channels into data to be transmitted. The method of claim 1, And transmitting the identifier information in the preamble of the transmitted data. The method of claim 1 or 2, wherein the controller, When the real-time of the data to be transmitted is required, the multimedia data transmission apparatus in the mobile communication system, characterized in that the transmission unit is set to a packet of a size that can accommodate the real-time. The method of claim 3, wherein the controller, The data of the transmission unit is a multimedia data transmission device in the mobile communication system characterized in that it determines and outputs the mapping value and the redundancy value according to the quality that can accommodate this different quality of service. The method of claim 4, wherein the controller, And a retransmission rate is determined according to the coded symbol value inserted in the preamble from the terminal when retransmission is required. The method of claim 1, The multimedia data transmission device in a mobile communication system, characterized in that the transmission including the identifier information via a separate physical channel with the transmitted data. The method of claim 6, wherein the controller, When the real-time of the data to be transmitted is required, the multimedia data transmission apparatus in the mobile communication system, characterized in that the transmission unit is set to a packet of a size that can accommodate the real-time. The method of claim 7, wherein the controller, The data of the transmission unit is a multimedia data transmission device in the mobile communication system characterized in that it determines and outputs the mapping value and the redundancy value according to the quality that can accommodate this different quality of service. The method of claim 8, wherein the controller, The retransmission rate is determined according to the data request rate (DRQ) requested from the terminal when retransmission is requested. In the method for transmitting multimedia data in a mobile communication system, Checking the type of application service to be transmitted and the nature of the data; Determining a size of an input packet by examining a resource state in a base station; Performing multiplexing on each of the quality channels and dividing them into transmission units and outputting the corresponding quality channels; Puncturing / repeating the data output through the quality channel and generating a subpacket multiple transmission rate of a transmission unit symbol; Performing a quality mapping according to the quality required for each transmission unit and determining a subpacket according to a transmission rate of data of each transmission unit; And serially combining the outputs of the respective quality channels and converting the outputs of the quality channels into transmission data. The method of claim 10, And retransmitting the data requested for retransmission from the mobile terminal based on the data rate requested from the mobile terminal when there is a retransmission request from the mobile terminal. In the method for transmitting multimedia data in a mobile communication system, Checking the type of application service to be transmitted and the nature of the data; Determining a size of an input packet by examining a resource state in a base station; Performing multiplexing on each of the quality channels and dividing them into transmission units and outputting the corresponding quality channels; Selecting a redundancy of the data output through the quality channel to generate a subpacket multiple transmission rate of a transmission unit symbol; Performing a quality mapping according to the quality required for each transmission unit and determining a subpacket according to a transmission rate of data of each transmission unit; And serially combining the outputs of the respective quality channels and converting the outputs of the quality channels into transmission data. The method of claim 12, And retransmitting the data requested for retransmission from the mobile terminal based on the data rate requested from the mobile terminal when there is a retransmission request from the mobile terminal. In the method for transmitting multimedia data in a mobile communication system, Checking the type of application service to be transmitted and the nature of the data; Determining a size of an input packet by examining a resource state in a base station; Performing multiplexing on each of the quality channels and dividing them into transmission units and outputting the corresponding quality channels; Generating a transmission unit and performing error checking data addition and coding; Performing puncturing / repetition according to a transmission rate requested from the terminal and generating a subpacket of a coded symbol; Performing a quality mapping of each transmission unit and selecting a subpacket of the transmission unit according to a transmission rate; And serially combining the quality channel outputs of the transmission units. The method of claim 14, And retransmitting the data requested for retransmission from the mobile terminal based on the data rate requested from the mobile terminal when there is a retransmission request from the mobile terminal.