MX2007007459A - Supporting hybrid automatic retransmission request in orthogonal frequency division multiplexing access radio access system. - Google Patents

Abstract

A method of supporting a hybrid automatic retransmission request (HARQ) in an orthogonal frequency division multiplexing access (OFDMA) radio access system is disclosed. Preferably, the method comprises receiving a downlink data frame comprising a data map information element and a data burst comprising a plurality of layers, wherein each layer is encoded with a corresponding channel encoder, and wherein the data map information element is configured to support multiple antennas to achieve space time transmit diversity by providing control information associated with each one of the plurality of layers, wherein the control information comprises allocation of acknowledgement status channels corresponding to the plurality of layers, and transmitting in an uplink data frame a plurality of acknowledgement status, each acknowledgement status being associated with whether a corresponding layer of the plurality of layers is properly decoded.

Description

APPLICATION SUPPORT FOR HYBRID AUTOMATIC RETRANSMISSION IN FREQUENCY DIVISION MULTIPLEX ACCESS RADIO ACCESS SYSTEM TECHNICAL FIELD The present invention relates to an Orthogonal Frequency Division Multiplex Access Access (OFDMA) radio access system, and more in particular, with supporting a request for hybrid automatic retransmission (HARQ) in the OFDMA radio access system. Although the present invention is suitable in a wide range of applications, it is particularly appropriate to reduce the generated totality of the retransmission despite the non-existence of transmission error. Whether a signal is transmitted through a plurality of antennas through the same uplink or downlink data burst when a multi-antenna system is used in the OFDMA radio access system supporting the HARQ. PREVIOUS BOX Generally, an automatic repeat request (ARQ) is a response message reported by the receiving side to a transmitting side after receiving the data transmitted from the transmitting side. The ARQ informs the transmitting side if the data was correctly received.

Additionally, the ARQ can be classified into three systems, as shown in Figures IA to 1C, respectively. Figure IA shows an ARQ system of 'return to N', in which the transmitting side eeperates after the transmission of data to receive an ACK or NACK message. The transmission side then sends new data or retransmits the previous data. Figure IB shows an ARQ system of 'dam to N', in which a transmitting side continuously transmits data independently of a response from a receiving side. After receiving a NACK signal, the transmitting side retransmits the data from a corresponding portion. Figure 1C is an ARQ system of 'selective repetition', in which a transmitting side continuously transmits data independently of a response from a receiving side. After receiving a NACK signal, the transmitting side transmits the corresponding data to the received NACK signal only. The hybrid ARQ (HARQ) is proposed to solve the problem that occurs when a major error occurs through a channel as a higher coding regime (c = 5/6, 1/4), or higher order modulation (Mod = 16-QAM, 64-QAM) and the like are selected due to a demand for a data rate higher than 2Mbps, lOMbps or higher in a packet transmission communication system. The erroneous transmission rate is stored in a buffer to have advance error correction (FEC) applied to it and combined with the information retransmitted in the HARQ system. In contrast, the erroneous data in transmission is discarded in the ARQ system. The HARQ system is a type of system generated by combining FEC and ARQ together. In addition, the HARQ can be classified mainly in the following four systems. In the first system, a HARQ Type I system shown in Figure 2, the data is always set to an error detection code to preferably detect FEC (forward error correction). If an error remains in a packet, retransmission is requested. An erroneous packet is discarded and a retransmitted packet is used with the same FEC code. In the second system, a HARQ Type II system called IR ARQ (Increment Redundancy ARQ) shown in Figure 3, an erroneous packet is not discarded but stored in a buffer to be combined with the retransmitted redundancy bits. In the retransmission, the Parity bits, except data bits, are retransmitted only. The retransmitted parity bits are changed every retransmission. In the third system, a HARQ Type III system shown in Figure 4, which is a special case of the HARQ Type II system, each packet is self-decoding. The package is configured with an erroneous part and the data to be retransmitted. This system can be decoded more accurately than the HARQ Type II system but is disadvantageous in the aspect of coding gain. In the fourth system, a HARQ system 'Type I with soft combination' shown in Figure 5, a data function initially received and stored by a transmitting side with retransmitted data is added to the HARQ Type I system. The HARQ system 'Type I with soft combination' it is called a metric combination or a search combination system. This system is advantageous in the aspect of signaling to signal-to-interference plus noise (SINR) and always uses the same parity bits of the retransmitted data. Recently, many efforts have been made to look for a develop OFDM (orthogonal frequency division multiplexing) or OFDMA (multiplexing access of orthogonal frequency division) appropriate for high-speed data transmission through a wired / wireless channel. In OFDM, the frequency usage efficiency is raised using a plurality of carrier waves having mutual orthogonality. A modulation / demodulation process of a plurality of carrier waves in transmission / reception has the same result as reality IDFT (Inverse Discrete Fourier Transformation / DFT (Discrete Fourier Transformation) and can be implemented at a high speed using (IFFT (transformation fast reverse Fourier) / FFT (fast Fourier transformation) An OFDM principle is to reduce the relative dispersion in a time domain by multipath delay scattering in a way to increase a symbol duration by dividing a data stream of high speed in a plurality of low speed data streams and simultaneously transmitting a plurality of the low speed data streams using a plurality of subcarriers, and, a data transmission by the OFDM uses a transmission symbol as a unit. that the modulation / demodulation in the OFDM It can be collectively for all subcarriers using DFT (discrete Fourier transform), it is unnecessary to design a modulator / demodulator for each of the individual subcarriers. Figure 6 illustrates a configuration of an orthogonal frequency division multiplexing modulator / demodulator (OFDM). Referring to Figure 6, a stream of data admitted in series is transformed into parallel data streams totaling the number of subcarriers. The inverse discrete Fourier transformation (IFDT) is carried out in each of the parallel data streams. For fast data processing, IFFT is used (Inverse fast Fourier transformation). The inverse Fourier transform data is then converted into serial data again to be transmitted through frequency conversion. A receiving side receives the corresponding signal to demodulate through a reverse process. In a mobile communication system, resources include frequency channels, i.e., frequency bands. Multiple access is a methodology of distributing frequency bands limited to users for efficient use. Duplication is a connection methodology to identify an uplink (UL) connection and a downlink (DL) connection in bidirectional communication. Multiple access radio and multiplexing systems are the basic platform technology of radio transmission to use the limited frequency resource efficiently and depend on an assigned frequency band, the number of users, a data regime, a structure of cell, a radio environment, etc. OFDM (Orthogonal Frequency Division Multiplexing), which is a class of MCM (multiple bearer transmission / modulation) system that uses several bearers, is a system that makes input data parallel as well as the number of bearers used to transmit the data. data loaded on the corresponding carriers. The OFDM is a strong candidate for a radio transmission technology that fills the requirements of a fourth generation mobile communication infrastructure and can be classified into frequency division multiple access OFDM (OFDM-FDMA), multiple access OFDM time division (OFDM-TDMA) and OFDM code division multiple access (OFDM-CDMA) in accordance with a multiple user access system. Each of the OFDM-FDMA, OFDM-TDMA and OFDM-CDMA systems has its merits and demerits. In addition, there are schemes to compensate for demerits. The OFDMA-FEMA (OFDMA), which is appropriate for fourth-generation macro / micro cellular infrastructure, has no interference between cells, high frequency reuse efficiency and excellent modulation and adaptation granularity. Using scattered frequency hop, multiple antennas, powerful coding and the like to begin the demerits of the OFDMA-FDMA, diversity can be raised and the influence of interference between cells can be reduced. The OFDMA can efficiently distribute resources by distributing the number of subcarriers differently in accordance with a data regime requested by each user. In addition, OFDMA can increase transmission efficiency since it is unnecessary for each user to perform initialization using a preamble before receiving data such as OFDM-TDMA. In particular, OFDMA, which is appropriate for a case using numerous subcarriers (e.g., a case where an FFT size is large), is efficiently applied to a radio communication system that has a cell area relatively broad. Likewise, the frequency hopping OFDMA system is used to raise a frequency diversity effect and obtain an intermediate interference effect overcoming a case where a deep fade subcarrier exists in a radio channel or a case where there is subcarrier interference caused by another user. Figure 6 shows the OFDMA system, in which a distributed grid performs frequency hopping in a frequency domain in accordance with a time slot. Figure 7 is a structural diagram of a data frame in the OFDMA radio communication system in accordance with the related branch. Referring to Figure 7, a horizontal axis is a time axis represented by a symbol unit and a vertical axis is a frequency axis represented by a subchannel unit. The subchannel refers to a beam of a plurality of subcarriers. In particular, in a physical OFDMA layer, the active carriers are divided into groups to be transmitted to different receiving ends, respectively. In this way, the group of subcarriers transmitted to a receiving end is called a subchannel. In this case, the carriers that configure the subchannel may be adjacent to each other or may be spaced evenly spaced from one another. A slot distributed to each user, as shown in Figure 7, is defined by a region of data to a two-dimensional space, which is a set of consecutive subchannels distributed by a burst. In the OFDMA, a region of data, as shown in Figure 7, can be represented as a rectangle determined by time and subchannel coordinates. This data region can be distributed to a specific user uplink. Likewise, a base station may transmit said data region to a specific downlink user. In the OFDM / OFDMA radio communication system of the related branch, in case there is the data to be transmitted to a mobile subscriber station (MSS), the base station (BS) distributes a region of data that is will transmit through DL-MAP (downlink-MAP). The mobile subscriber station receives the data through the distributed region (bursts from DL # 1 to # 5 in Figure 7). In Figure 7, a downlink subframe begins with a preamble used for synchronization and balance in a physical layer and a structure in a complete frame is defined through broadcast formatted downlink MAP (DL-MAP) and outbound messages. uplink-MAP (UL-MAP) that define locations and uses of bursts distributed to the uplink and downlink, respectively.

The DL-MAP message defines distributed burst use at a downlink interval in a physical burst mode layer, and the UL-MAP message defines the use of burst distributed to an uplink interval. In an information element (IE) which configures the DL-MAP message, a downlink traffic interval is identified at a user end by DIUC (downlink interval use code) and position information (v.gr) ., subchannel deviation, symbol deviation, subchannel number, symbol number) of the burst. Meanwhile, in an information element that configures the UL-MAP message, the use is determined by UIUC (use code of uplink interval) by CID (connection ID) and a position of a corresponding interval is regulated by duration. ' In this case, the use per interval is determined in accordance with a UIUC value used in the UL-MAP. Each interval starts from a point that has a distance away from an earlier IE starting point, where the distance is as far as the 'duration' regulated by the UL-MAP IE. A DCD message (downlink channel descriptor) and a UCD message (uplink channel descriptor) include types of modulation, types of FEC code and the like as associated parameters of physical layer to be applied to the burst intervals distributed in descending letter and uplink, respectively. Also, the necessary parameters (eg, K. R, etc., of R-S code) in accordance with various types of advance error correction code are provided. These parameters are provided by burst profiles provided for the UIUC (uplink interval use code) and DIUC (downlink interval use code) in the UCD and DCD, respectively. In the OFDMA communication system, the burst distribution method can be classified into a general MAP method and a HARQ method according to whether the HARQ system is supported. The downlink general MAP burst distribution method shows a rectangular shape, as shown in Figure 7, configured with time and frequency axes. To say, it teaches a start symbol number (symbol deviation), and start subchannel number (subchannel deviation), the number of symbols used (symbols of No. OFDMA) and the number of subchannels used (No.

Subchannels). Since a method of distributing bursts to a symbol axis in sequence is used in the link Ascending, uplink bursts can be distributed by teaching the number of symbols used only. Figure 8 is a diagram of a data frame in accordance with a HARQ MAP. Referring to Figure 8, in the HARQ MAP, a method for distributing bursts along a subchannel (subcarrier) axis in sequence is used in both uplink and downlink, which is different from that of a general MAP, in the HARQ MAP, a length of one burst is reported only. In this method, the bursts, as shown in Figure 8, are distributed in sequence. A start position of a burst corresponds to a position where a previous burst ends and occupies a radio resource that totals a distributed length from the start position. The method explained in the following relates to a method for distributing bursts in a cumulative manner along a frequency axis. A method for distributing outbursts along an axis of time follows the same principle. In the HARQ MAP, a MAP message can be divided into a plurality of MAP messages (eg, NARQ MAP # 1, HARQ MAP # 2, ..., HARQ MAP # N) so that each of the messages Split MAPs can have information of a pop random. For example, a MAP # 1 message may include information from a burst # 1, a MAP # 2 message may include information from a burst # 2, and a MAP # 3 message may include burst information # 3- # 5. As mentioned in the previous description, the OFDMA system uses the HARQ MAP to support the HARQ. Since an HARQ MAP IE pointer is included in the DL MAP, there is a method for distributing bursts in sequence along a downlink subchannel axis in the HARQ MAP if a position of the HARQ MAP is reported. A start position of a burst corresponds to a position where a previous burst ends and occupies a radio resource that totals a distributed length from the start position, which is applied to the uplink as it is. In the HARQ MAP, the control information must be reported. Table 1 shows a data format of an HARQ control IE to indicate the control information. . { Table 1.}. Syntax Size (bis) Notes HARQ_Control_IB (). { Prefix 0 = HARQ temporary incapacitated 1 = HARQ trained Yes (Prefix ===) AI_SN 1 ID HARQ Sec. No SPID 2 ID Subpackage ACID 4 ID HARQ CH} O well . { reserved 3 Will be set to zero} } The control information includes AI_SN, SPID, SCID, etc. The AI_SN is a value, which is articulated between '0' and '1' if a burst transmission is successful through the same ARQ channel, to indicate whether a burst transmitted is a new burst or corresponds to a retransmission of a previous burst . Four classes of redundancy bits are reserved for the data bits put in each burst for HARQ transmission. The SPID is a value to select a different redundancy bit during each retransmission. The SCI is a HARQ channel ID. An ACK signal region of the uplink is reported via an ACK / NACK signal if the transmitted data burst was received successfully. If a mobile subscriber station receives a burst on the 1st burst, the ACK / NACK signal is sent to the ACK signal region of the uplink of a frame (1 + 1). A value of "1" is send through the UCD. When distributing the ACK signal region, there is a method for distributing the ACK signal region to the uplink for each HARQ message. There is another method wherein at least two of a plurality of HARQ MAP messages in a frame uses an ACK signal region. A method wherein slots of an ACK / NACK signal of a burst indicated by a HARQ MAP message is reported in sequence by deciding a HARQ ACK region of a frame as one is explained in detail as follows. Figure 9 is a diagram of a method for distributing a HARQ signal region in a HARQ MAP message. In a message from HARQ MAP, an ACK signal region is distributed to an uplink using a start position of the ACK signal region and four information classes (OFDMA symbol deviation, subchannel deviation, OFDMA Symbols No., Subchannel No.). Each mobile subscriber station sequentially inputs an ACK / NACK signal to the ACK signal region (Figure 9) distributed to the uplink to indicate whether a respective burst has been successfully received. A starting position of the ACK / NACK signal corresponds to a position next to that of the previously received ACK / NACK information. A sequence of ACK / NACK signals follows a sequence of bursting of a downlink within the HARQ MAP message. To say, as the sequence of bursts # 1 to # 7, the ACK / NACK signals within the distributed HARQ ACK region of the uplink are sent in a sequence corresponding to the sequence of bursts # 1 to # 7. Referring to Figure 9, a MAP # 1 message includes pops distribution information # 1 t # 2, a MAP # 2 message includes popping distribution information # 3 and # 4, and a MAP # 3 message includes information from distribution of bursts # 6 and # 7. The mobile subscriber station # 1 (MSS # 1) reads the burst information # 1 in the contents of the MAP message # 1 and then reports an initial slot within the HARQ ACK signal region indicated by a HARQ MAP message if the data transmitted was satisfactorily received. MSS # 2 knows the position within the HARQ ACK signal region recognizing that it is sequentially next to that of the signal slot ACK / NACK of pop # 1 within the ACK signal region (The position within the HARQ ACK region is known by increasing a burst count # 1 within the contents of the MAP # 1 message). MSS # 3 knows its position within the HARQ ACK region by calculating the total number of slots in bursts # 1 and # 2 of the MAP # 1 message. This l Thus, the positions within the HARQ ACK region can be known in sequence. In case a mobile subscriber station supporting multiple antennas to a downlink burst area loads data in the same area to transmit or in case several mobile subscriber stations load data in the same area to transmit, the signal ACK is sent only if there is no error in a cyclic redundancy check (CRC) for all layers. Otherwise, the NACK signal is sent. In this case, a layer means a coding unit of the transmitted data and the number of layers corresponds directly to the number of antennas depending on how the data is transmitted. For example, if the complete data to be transmitted is encoded, a CRC is then inserted into the encoded data. This is then divided by the number of antennas. If the split data is transmitted through all the antennas, the number of layers is equal to one. In another example, if the cato to be loaded on each antenna is encoded a CRC is then inserted into the encoded data. If the encoded data is transmitted, the number of layers is equal to the number of antennas (see Figure 10). The situation explained above is applicable to a case where a mobile subscriber station transmits an outbound link ascending and a case where a base station having received the burst sends an ACK signal in downlink. The related branch method explained above can be simply applied to a system that is not a multi-antenna system. However, in the case of the multiple antenna system, the related branch method causes a waste of resources. For example, if a base station detects a case in which two mobile subscriber stations # 1 and # 2 load their data in burst # 2, the number of layers is 2. In addition, the burst of subscriber station # 1 Mobile is wrong. The base station then sends a NACK signal to both mobile subscriber stations # 1 and # 2 in accordance with the aforementioned principles of the related branch. If so, both of the mobile subscriber stations must send the data again. Consequently, the error-free data from mobile subscriber station # 1 is discarded for retransmission, which is a waste of resources. In addition, the same uplink problem can be applied directly to the case of the downlink. EXHIBITION OF THE INVENTION The present invention is directed to transmit packet data in a wireless communication system configured to support multiple inputs and multiple outputs. Further features and advantages of the invention will be set forth in the description that follows, and in part will be evident from the description, or can be learned by practicing the invention. The objects and other advantages of the invention will be realized and achieved by the structure particularly noted in the written description and the claims hereof as well as the accompanying drawings. To achieve these and other advantages and in accordance with the purpose of the present invention, as it is modalized and broadly described, the present invention is modalized in a method for transmitting packet data in a wireless communication system configured to support multiple inputs and multiple outputs, the method comprising receiving a downlink data frame comprising a data map information element and a data burst comprising a plurality of layers, wherein each layer is encoded with a corresponding channel encoder, and in where the data map information element is configured to supporting multiple antennas to achieve space time transmission diversity by providing control information associated with each of the plurality of layers, wherein the control information comprises distribution of knowledge state channels corresponding to the plurality of layers, and transmitting in an uplink data frame a plurality of knowledge states, each state of knowledge being associated with whether a corresponding layer of the plurality of layers is appropriately decoded. In one aspect of the invention, the control information for each of the plurality of layers comprises at least one of a traffic interval, a channel identifier, a retransmission state and a value for selecting a different redundancy bit during the retransmission In a further aspect of the invention, the channel encoder comprises an advance error correction encoder. In another aspect of the invention, the data map information element comprises a map information element HARQ. In one aspect of the invention, a subchannel means is use for each state of knowledge. In a further aspect of the invention, at least part of the plurality of knowledge states is represented by code words. In another aspect of the invention, the data map information element is an uplink map information element and a downlink map information element. In accordance with another embodiment of the present invention, a method for transmitting packet data in a wireless communication system configured to support multiple inputs and multiple outputs comprises receiving a first downlink data frame comprising a map information element. data, wherein the data map information element is configured to support multiple antennas to achieve space time transmission diversity by providing control information associated with one of a plurality of layers, wherein the control information comprises distribution of knowledge state channels corresponding to the plurality of layers, transmitting in a uplink data frame a data burst comprising the plurality of layers, wherein each layer is encoded with a corresponding channel encoder, and receiving a second downlink data frame comprising a plurality of knowledge states, each state of knowledge being associated with whether a corresponding layer of the plurality of layers is appropriately decoded. In one aspect of the invention, the control information for each of the plurality of layers comprises at least one traffic interval, a channel identifier, a retransmission state and a value for selecting a different redundancy bit during retransmission. In a further aspect of the invention, the channel encoder comprises an advance error correction encoder. In another aspect of the invention, the data map information element comprises a map information element HARQ. In one aspect of the invention, a sub-channel means is used for each state of knowledge. In a further aspect of the invention, at least part of the plurality of knowledge states is represented by code words.

In another aspect of the invention, the data map information element is one of an uplink map information element and a downlink map information element. According to another embodiment of the present invention, a method for transmitting packet data in a wireless communication system configured to support multiple inputs and multiple outputs comprises transmitting to a receiver device a downlink data frame comprising an information element. of data map and a burst of data comprising a plurality of layers, wherein each layer is encoded with a corresponding channel encoder, and wherein the data map information element is configured to support multiple antennas to achieve space time transmission diversity by providing control information associated with each of the plurality of layers, wherein the control information comprises distribution of knowledge state channels corresponding to the plurality of layers, and receiving an uplink data frame comprising a plurality of knowledge states, each state of knowledge being associated with if a corresponding layer of the plurality of layers is properly decoded by the receiving device. In one aspect of the invention, the control information for each of the plurality of layers comprises at least one traffic interval, a channel identifier, a retransmission state and a value for selecting a different redundancy bit during retransmission. In a further aspect of the invention, the channel encoder comprises an advance error correction encoder. In another aspect of the invention, the data map information element comprises a map information element HARQ. Preferably, the method further comprises retransmitting data associated with a corresponding layer upon receiving an acknowledgment indicating that the corresponding layer was not appropriately decoded by the receiving device. In one aspect of the invention a subchannel means is used for each state of knowledge. In a further aspect of the invention, at least part of the plurality of knowledge states is represented by code words.

In another aspect of the invention, the data map information element is an uplink map information element and a downlink map information element. In accordance with another embodiment of the present invention, a wireless communication apparatus for transmitting packet data comprises a plurality of antennas to achieve space time transmission diversity, a plurality of channel encoders, each associated with a corresponding antenna, and a controller configured to recognize a transmission data frame comprising a data map information element and a data burst comprising a plurality of layers, wherein each layer is encoded with a corresponding channel encoder, and wherein the data map information element comprises control information for each of the plurality of layers, wherein the controller is further configured to recognize a reception data frame comprising a plurality of knowledge states, each state of knowledge being associated with whether a corresponding layer of the plurality of layers is rec ibe appropriately by a receiving device.

In one aspect of the invention, the control information for each of the plurality of layers comprises at least one traffic interval, a channel identifier, a retransmission state and a value for selecting a different redundancy bit during retransmission. In a further aspect of the invention, the channel encoder comprises an advance error correction encoder. In another aspect of the invention, the data map information element comprises a map information element HARQ. In one aspect of the invention, a sub-channel means is used for each state of knowledge. In a further aspect of the invention, at least part of the plurality of knowledge states is represented by code words. In another aspect of the invention, the data map information element is one of an uplink map information element and a downlink map information element. It should be understood that both the foregoing general description and the following detailed description of the present invention are exemplary and explanation and BRIEF DESCRIPTION OF THE DRAWINGS The accompanying drawings, which are included to provide further understanding of the invention and are incorporated into and constitute a part of this specification, illustrate embodiments of the invention. and together with the description serve to explain the principles of the invention. The particularities, elements and aspects of the invention having reference to the same numbers in different figures represent particularities, elements or aspects equal, equivalent or similar according to one or more modalities. Figures IA to 1C illustrate different types of application systems for automatic repetition (ARQ) in accordance with the related branch. Figures 2 to 5 illustrate the particularities of the different types of ARQ systems in accordance with the related branch. Figure 6 illustrates a configuration of an orthogonal frequency division multiplexing modulator / demodulator (OFDM).

Figure 7 illustrates a data frame in an orthogonal frequency division multiplex access (OFDMA) access radio communication system in accordance with the related branch. Figure 8 illustrates a data box that distributes a HARQ burst in accordance with the related branch. Figure 9 illustrates a method for distributing a HARQ signal region in a HARQ MAP message in accordance with the related branch. Figure 10 illustrates a layer coding method in accordance with the related branch. Figure 11 illustrates a data chart of an OFDMA radio access system in accordance with a preferred embodiment of the present invention. Figure 12 illustrates a distribution sequence of an ACK / NACK transport channel in accordance with a preferred embodiment of the present invention. Figure 13 illustrates a method for distributing ACK / NACK transport channels within ACK uplink and downlink signal regions in accordance with a preferred embodiment of the present invention.

Figure 14 illustrates a method for distributing ACK / NACK transport channels within ACK uplink and downlink signal regions in accordance with a preferred embodiment of the present invention. Figure 15 illustrates a method for distributing ACK / NACK transport channels within ACK uplink and downlink signal regions in accordance with a preferred embodiment of the present invention. BEST MODE FOR CARRYING OUT THE INVENTION The present invention relates to hybrid automatic retransmission request (HARQ) support in an orthogonal frequency division multiplexing access radio (OFDMA) access system. Specifically, the present invention relates to transmitting packet data in a wireless communication system configured to support multiple inputs and multiple outputs. Reference will now be made in detail to the preferred embodiments of the present invention, examples of which are illustrated in the accompanying drawings. Whenever possible, the same reference numbers will be used throughout the drawings to refer to the same or similar parts.

The present invention describes a method for sending an ACK or NACK signal per layer when a multi-antenna system is applied to a burst of uplink or downlink data. In other words, the ACK / NACK signal transport channels that totalize the number of layers distributed to the data burst are distributed to the uplink or downlink data that the multi-antenna system has applied thereto. When a mobile subscriber station that supports multiple antennas in a downlink burst sends data loaded in the same frame or in case several mobile stations send data loaded in the same frame, the signals of all the layers are loaded in the same frame . However, a receiving side detects the signals and identifies the signal through the layer. And, it is able to know the presence or absence of signal error per layer by performing a cyclic redundancy check (CRC) for the signal of the identified layer. The present invention intends to allow a transmission side to know the presence or absence of error of the signal per layer transmitting an ACK or NACK signal. To support this, the distribution of an ACK or NACK channel per layer is needed so that the presence or absence of error can be made. Through the channels, one side that has transmitted a burst can receive the ACK or NACK signal per layer and then decide the next form of transmission. For example, retransmitting the signal of the layer corresponding to the received NACK or stopping the signal transmission of the layer corresponding to the received ACK until other layers receive the ACK signals in accordance with a system implementation method, the interference with other signals is reduced . Loading the other data, the system is capable of increasing a transmission capacity. In this way, to use a different transmission method per layer, control information must be provided to each layer. For example, in the related branch, the combined control information is provided since all the layers receive the ACK or NACK together. However, in accordance with the present invention, various kinds of control information are preferably provided, such as information indicating whether each layer receives the ACK or NACK, whether to provide a new burst, whether to retransmit a previous burst (AI: SN ), whose four-type redundancy bit (SPID) will be provided and information regarding an H-ARQ (SCID) ID channel.

Figure 11 is a diagram of a data frame in an ORDMA radio access system in accordance with a preferred embodiment of the present invention. Preferably, an ACK / NACK transport channel distribution method driven by a base station that transmits data by two layers to a plurality of mobile subscriber stations that apply a multi-antenna system are shown. Referring to Figure 11, a base station distributes a downlink ACK region (DL-ACK SIGNAL REGION) to a downlink sub-frame (DL) and an uplink ACK signal region (UL SIGNAL REGION- ACK) to a sub-link uplink (UL). The downlink ACK signal region is a distributed region for an ACK or NACK signal transmitted by the base station in response to data transmitted from a plurality of mobile subscriber stations. The uplink ACK signal region is a distributed region for ACK or NACK signals transmitted by one or more of the mobile subscriber stations in response to the data transmitted from the base station. In the event that the base station transmits bursts of data comprising two layers, the mobile subscriber stations that receive data bursts by the two layers verify a transmission error of the data transmitted by each layer of the base station (eg, CRC check). If there is no transmission error per layer in accordance with a verified result, a corresponding mobile subscriber station transmits an ACK signal. If the transmission error exists, a corresponding mobile subscriber station transmits a NACK signal. An ACK / NACK transport channel is distributed to the mobile subscriber stations that receive the burst of data transmitted with a layer by the base station. Consequently, the transport channels of ACK / NACK # 1-1, # 1-2, # 2-1, # 2-2, # 3, # 4 ..., which totalizes the same number of layers used for the station The base transmit data bursts are distributed to the uplink ACK signal region of the uplink sub-frame for the mobile subscriber stations, respectively. Within the downlink ACK signal region, the base station distributes the ACK / NACK transport channels # 2-1 and # 2-2 per layer for the mobile subscriber station transmitting data by two layers and one channel of transmission. transport of ACK / NACK # 1, # 3, # 4 or similar for each of the mobile subscriber stations that use one layer each. The base station checks a transmission error for data transmitted from the corresponding mobile subscriber station (eg, CRC check). If there is no transmission error per layer according to a verified result, the base station transmits an ACK signal, if there is a transmission error, the base station transmits a NACK signal. The ACK / NACK transport channel may be distributed in sequence along a time axis within the uplink ACK signal region and the downlink ACK signal region, along a frequency axis, or along frequency and time axes alternately. Alternatively, a subchannel means may be used by an ACK or NACK signal to be distributed along frequency and time axes alternately in order, as shown in Figure 12. Preferably, the subchannel means includes twenty-four subcarriers. Figure 13 is an exemplary diagram of a method for distributing ACK / NACK transport channels within uplink and downlink ACK signal regions in accordance with another embodiment of the present invention. Preferably, an uplink or downlink ACK region for a mobile subscriber station having a multi-antenna system is distributes separately within an uplink ACK signal region and a downlink ACK signal region. Referring to Figure 13, for a mobile subscriber station that transmits a burst of data by two layers (2-layers) within a downlink ACK region, a transport channel # 2-1 of ACK / NACK for a first layer of distributed together with an ACK / NACK transport channel for a mobile subscriber station that transmits a burst of data through a layer. The other channel # 2-2 of ACK / NACK transport for a second layer is distributed by establishing a separate ACK region within the downlink ACK region. Preferably, the same method is applied to an uplink ACK region (UL-ACK region). In Figure 13, a base station transmits a burst # 2 HARQ DL for four layers (4-layers). The separated ACK region distributed for the second or higher order layer is then preferably distributed to the region to which the ACK / NACK transport channel for the first layer is distributed. Figure 14 is an example diagram of a method for distributing the ACK / NACK transport channels with Uplink and downlink ACK signal regions according to another embodiment of the present invention. In Figure 14, an uplink or downlink ACK region for a mobile subscriber station having a multi-antenna system is distributed separately within an uplink ACK signal region and a downlink ACK signal region. The method shown in Figure 14 differs from the modalized method in Figure 13 in that a plurality of channels # 2-2, # 2-3 and # 2-4 transport ACK / NACK for the same burst of data that has a The plurality of layers applied thereto is distributed as an ACK / NACK transport channel using a codeword. To say, in the example shown in Figure 14, the code word is used to reduce a scale of the uplink ACK region because the scale of the uplink ACK region can be unnecessarily extended if it is raised the number of layers. Table 2 and Table 3 show examples of code words to support Figure 14.. { Table 2.}. Code word. { layer4, layer3, group games (total 24 layer2 } subcarriers) CO. { O O 0.}. G0 G0 GO Cl. { O O 1.}. G4 G7 G2 C2. { O 1 0.}. G7 G2 G4 C3. { O 1 1.}. G2 G4 G7 C4. { 1 OR 0.}. Gl G3 G5 C5. { 1 OR 1.}. G3 Gl G3 C6. { 1 1 0.}. G5 Gl G3 C7. { 1 1 1.}. G6 G6 G6. { Table 3.} Group game Signal of 8 subcarriers to transmit G0 P0, Pl, P2, P3, P0, Pl, P2, P3 Gl PO, PE, P2, Pl, PO, P3, P2, Pl G2 PO, PO, Pl, Pl, P2, P2, P3, P3 G3 PO , PO, P3, P3, P2, P2, Pl, Pl G4 PO, PO, PO, PO, PO, PO, PO, PO G5 PO, 02, PO, P2, PO, P2, PO, P2 G6 PO, P2 , PO, P2, P2, PO, P2, PO G7 PO, P2, P2, PO, P2, PO, PO, P2 In the transmission of an uplink ACK / NACK signal, as mentioned in the previous description, a subchannel means includes twenty-four subcarriers by an ACK or NACK signal. If the code word in Table 2 or Table 3 is used, it is capable of transmitting one to three ACK or NACK signals using the twenty-four subcarriers. The examples in Table 2 and Table 3 define the code word for four layers, which are applicable to two or three layers as well. Preferably, for the data burst that has three layers applied to it, the code word associated with layer-4 in Table 1 and Table 3 is ignored. For the data burst that has two layers applied to it, the code words associated with layer-4 and layer 3 in Table 1 and Table 3 are ignored. Meanwhile, in case of downlink, as the related branch method, the need to use the codeword is reduced if an ACK / NACK signal is transmitted using a bit. Figure 15 is an exemplary diagram of a method for distributing ACK / NACK transport channels within uplink and downlink ACK signal regions in accordance with another embodiment of the present invention. Referring to Figure 15, the ACK region for a mobile subscriber station that uses a burst of data and that has a multi-antenna system applied thereto is distributed separately from the Same way as Figure 13 or Figure 14. The ACK / NACK transport channels are distributed to the rest of the uplink or downlink ACK region. Therefore, an ACK signal is sent only if a CRC is not wrong for all layers. Otherwise, the NACK signal is sent. Table 4 and Table 5 show compact DL-MAP IE formats of MIMO and compact MIMO UL-MAP IE in accordance with one embodiment of the present invention, respectively. . { Table 4.} Syntax Size Notes (bits) DL-MAP IE () Compact MIMO Type Compact_DL-MAP 3 Type = 7 Subtype DL-MAP 5 MIMO = 0x01 Length 4 Length of IE in Bytes Matrix indicator 2 Matrices DL_STC (see 8.4.8.3) Layer No. 2 Number of multiple layers of coding / modulation layer 00 - 1 layer 01 - 2 layer 10 - 3 layer 11 - 4 For (j = l • < Null_layer j ++ This loop specifies the Nep for layers 2 and above when required for STC The same Nach and RCID applied on each layer Si (Mode H-ARQ = CTC Mode H-ARQ is specified Incremental Redundancy). { in the IE Nep format} Compact? _DL-MAP from H-ARQ Or if (H-ARQ Mode = to Switch to HARQ Mode Generic Search). { DIUC CQIQ Feedback_Type 3 CQICH content type for this SS 000 = Fault feedback 001 = Width matrix of percoding weight 010 = Channel matrix H 011 = MIMO mode and permutation zone 100-111 = reserved CQICH No. Total number of CQICHs assigned to this MSS is (CQICH_Núm * 1) For (1 = 1; i <CQICH Num; i ++; Index index distribution to identify unique way the additional CQICH resources allocated to the SS H-ARQ Variable IE Control Fill variable Fill bits are used to ensure that IE size is integer number of bytes Table 5.}. Size Notes (bits; Syntax MIMO Comparct UL-MAP IB Type Compact UL-MAP 3 Type = 7 UL-MAP Subtype 5 MIMO = 0x01 Length 4 IE Length in Bytes Matrix indicator 2 UL-STC matrices (see 8.4.8.4) For 2-antennas SS, 0 = Matrix A 1 = Matrix B For Collaboration SM capable SS, 0 = Pilot pattern A 1 = Pilot pattern B Layer number Number of layers of multiple coding / modulation 00 = 1 layer 01 = 2 layer For (j =) j < Núm capai ++ (. {This circuit specifies the Nep for 2 layers and higher when required for STC The same Nac and RCID applied for each layer If "Mode H-ARQ = CTC 1 Mode H-ARQ is specified Incremental Redundancy). { in the IE training of H-ARQ Nep) Compact_CL-MAP for O si (H-ARQ Mode = Search Change Generic HARQ Mode ( {DIUC H-ARQ Variable Control-IE Variable fill The fill bits are used to ensure that the size of IE is an integer number of bytes} Since it is unable to provide control information per layer, the related information element (IE) is not able to support the present invention. Therefore, the MIMO Compact DL / UL MAP information message IE) to support the HARQ of multiple antennas must be provided for various kinds of control information to allow each layer to have a different operation. In this case, the various kinds of control information include information indicating whether a new burst will be provided or a previous burst will be retransmitted in accordance with ACK or NACK provided to each layer (AI SN), information indicating which bit of redundancy of the four types will be provided (SPID), and channel ID information H-ARQ (SCID). The various kinds of control information may have fields directly arranged in the information message (Compact DE MIMO IE / UL MAP) which supports the HARQ of multiple antennas if necessary. Alternatively, the diverse control information clauses can be used in a way to insert the related field information element 'Control-IE' into the information message (MIMO Compact DL / UL MAP IE) supporting the multiple antenna's HARQ. Accordingly, in the present invention, in the event that the multi-antenna system transmits signals over a plurality of antennas through the same uplink or downlink data burst, the ACK or NACK signal is transmitted per layer. Therefore, the present invention can reduce the generated totality of the retransmission independently of the transmission error. Although the present invention is described in the context of mobile communication, the present invention can also be used in any wireless communication system using mobile devices, such as laptops, such as PDAs and computers. laptops equipped with wireless communication capabilities. Preferred embodiments can be implemented as a method, apparatus or article of manufacture using conventional programming and / or engineering techniques to produce software, firmware, hardware or any combination thereof. The term "article of manufacture" as used herein refers to code or logic implemented in hardware logic (eg., an integrated circuit chip, Field Programmable Gate Arrangement (FPGA), Application Specific Integrated Circuit (ASIC), etc.) or a computer readable medium (eg, magnetic storage medium (e.g. , hard disk drives, soft disks, tape, etc. =, optical storage (CD-ROMs, optical discs, etc.), volatile and non-volatile memory devices (eg, EEPROMs, ROMs, PROMs, RAMs, DRAMs, SPRAMs, firmware, programmable logic, etc.) The code in the computer readable medium is accessed and executed by a processor The code in which the preferred modalities are implemented can also be accessed through a transmission medium or a file server through a network, in these cases, the article of manufacture in which the code is implemented 4 it may comprise a transmission medium, such as a network transmission line, wireless transmission medium, signals propagating through space, radio waves, infrared signals, etc. Of course, those skilled in the art will recognize that many modifications can be made to this configuration without departing from the scope of the present invention, and that the article of manufacture may comprise any medium containing information known in the art. Preferably, the present invention can be modalized in a mobile communication device comprising the processor described above together with a plurality of antenna and channel encoders, as illustrated in Figure 10, and the components described in Figure 6. It will be evident to those skilled in the art that various modifications and variations may be made in the present invention without abandoning the spirit or scope of the inventions. Thus, it is intended that the present invention cover the modifications and variations of this invention as long as they fall within the scope of the appended claims and their equivalents. INDUSTRIAL APPLICABILITY The present invention is applicable to a wireless communication system such as an access system broadband wireless, a mobile communication system, or a portable internet system, etc.

Claims (29)

1. CLAIMS 1. A method for transmitting packet data in a wireless communication system configured to support multiple inputs and multiple outputs, the method comprising: receiving a downlink data frame comprising a data map information element and a data link data burst comprising a plurality of layers, wherein each layer is encoded with a corresponding channel encoder, and wherein the data map information element is configured to support multiple antennas to achieve space time transmission diversity providing control information associated with each of the plurality of layers, wherein the control information comprises distribution of knowledge state channels corresponding to the plurality of layers; and transmitting in a uplink data frame a plurality of knowledge states, each state of knowledge being associated with whether a corresponding layer of the plurality of layers is appropriately decoded. 2. The method according to claim 1, wherein the control information for each of the
2. The plurality of layers comprises at least one traffic interval, a channel identifier, a retransmission state and a value for selecting a different redundancy bit during retransmission.
3. 3. - The method of compliance with the claim 1, wherein the channel encoder comprises an advance error correction encoder.
4. 4. - The method according to claim 1, wherein the data map information element comprises a map information element HARQ.
5. 5. - The method according to claim 1, wherein a subchannel medium is used for each state of knowledge.
6. 6. - The method according to claim 1, wherein at least part of the plurality of states of knowledge is represented by code words.
7. 7. - The method of compliance with the claim 1, wherein the data map information element is one of an uplink map information element and a downlink map information element.
8. 8. - A method for transmitting packet data in a wireless communication system configured for support multiple inputs and multiple outputs, the method comprising: receiving a first downlink data box comprising a data map information element, wherein the data map information element is configured to support multiple antennas to achieve diversity transmitting space time providing control information associated with each of a plurality of layers, wherein the control information comprises knowledge state channel distribution corresponding to the plurality of layers, transmit in the uplink data frame a burst of data comprising the plurality of layers, wherein each layer is encoded with a corresponding channel encoder; and receiving a second downlink data frame comprising a plurality of knowledge states, each state of knowledge being associated with whether a corresponding layer of the plurality of layers is properly decoded.
9. 9. The method according to claim 8, wherein the control information for each of the plurality of layers comprises at least one range of traffic, a channel identifier, a retransmission state and a value to select a different redundancy bit during retransmission.
10. 10. The method according to claim 8, wherein the channel encoder comprises an advance error correction encoder.
11. 11. The method according to claim 8, wherein the data map information element comprises a HARQ map information element.
12. 12. The method according to claim 8, where a subchannel means is used for each state of knowledge.
13. 13. The method according to claim 8, wherein at least part of the plurality of states of knowledge is represented by code words.
14. 14. The method according to claim 8, wherein the data map information element is one of an uplink map information element and a downlink map information element.
15. 15.- A method to transmit packet data in a wireless communication system configured to support multiple inputs and multiple outputs, the method comprising: transmitting to a receiver device a downlink data frame comprising a data map information element and a data burst comprising a plurality of data layers, wherein each layer is encoded with a corresponding channel encoder, and wherein the data map information element is configured to support multiple antennas to achieve space time transmission diversity by providing control information associated with each of them. the plurality of layers, wherein the control information comprises distribution of knowledge state channels corresponding to the plurality of layers; and receiving an uplink data frame comprising a plurality of state of knowledge, each state of knowledge being associated with whether a corresponding layer of the plurality of layers is appropriately decoded by the receiving device.
16. 16. The method according to claim 15, wherein the control information for each of the plurality of layers comprises at least one of a traffic interval, a channel identifier, a retransmission state and a value to select a different redundancy bit during retransmission.
17. 17. The method according to claim 15, wherein the channel encoder comprises an advance error correction encoder.
18. 18. The method according to claim 15, wherein the data map information element comprises a HARQ map information element.
19. 19. The method according to claim 15, further comprising retransmitting data associated with a corresponding layer upon receiving a knowledge indicating that the corresponding layer was not appropriately decoded by the receiver device.
20. 20. The method according to claim 15, wherein a subchannel means is used for each state of knowledge.
21. 21. The method according to claim 15, wherein at least part of the plurality of knowledge state is represented by code words.
22. 22. The method of compliance with the claim 15, wherein the information data map element is one of an uplink map information element and a downlink information element.
23. 23. A wireless communication apparatus for transmitting packet data, the apparatus comprising: a plurality of antennas to achieve diversity of space time transmission; a plurality of channel encoders, each associated with a corresponding antenna; and a controller configured to recognize a transmission data frame comprising a data map information element and a data burst comprising a plurality of layers, wherein each layer is encoded with a corresponding channel encoder, and wherein the data map information element comprises control information for each of the plurality of layers, wherein the controller is further configured to recognize a reception data frame comprising a plurality of knowledge state, each state of knowledge being associated with whether a corresponding layer of the plurality of layers is properly received by a receiving device.
24. 24. - The apparatus according to claim 23, wherein the control information for each of the plurality of layers comprises at least one of a traffic interval, a channel identifier, a retransmission state and a value for selecting a bit of different redundancy during retransmission.
25. 25. The apparatus according to claim 23, wherein the channel encoder comprises an advance error correction encoder.
26. 26. The apparatus according to claim 23, wherein the data map information element comprises a HARQ map information element.
27. 27. The apparatus according to claim 23, wherein a subchannel half is used for each state of knowledge.
28. 28. The apparatus according to claim 23, wherein at least part of the plurality of states of knowledge is represented by code words.
29. 29. The apparatus according to claim 23, wherein the data map information element is one of a map information element of uplink and a downlink map information element.