KR20020015297A - Data delivery method for hybrid ARQ type 2/3 on the wide-band wireless communication system - Google Patents

Abstract

PURPOSE: A method for transporting data for a hybrid ARQ type 2/3 in a broadband radio communication system is provided to perform a coding of a physical layer effectively, by transporting a repeat version number to a primitive between each layer(RLC-MAC,MAC-physical layer) additionally. CONSTITUTION: According to the method for transporting data during a hybrid ARQ type 2/3 for effective data transportation in radio communication system, in an RCL(Radio Link Control) layer, a repeat version number is added to a primitive between an RLC layer and a MAC(Medium Access Layer) layer and is transferred to the MAC layer through a logic channel(401). And a repeat version number is added to the primitive between the MAC layer and a physical layer and is then transferred to the physical layer through a transport channel(403). And, in the physical layer, a data transport block transferred to the transport channel is encoded, using the repeat version number transferred through the primitive between the MAC layer and the physical layer.

Description

Data delivery method for hybrid ARQ type 2/3 on the wide-band wireless communication system

The present invention provides a data transmission method for hybrid automatic retransmission request type 2/3 (Hybrid Automatic Repeat for reQuest (IIQ) type II / III) in a broadband wireless communication system and a computer readable recording program for realizing the method. Regarding a recording medium, a retransmission relationship number indicating a number of retransmissions is added to a primitive parameter between a Radio Link Control (RLC) layer, a Medium Access Control (MAC) layer, and a MAC layer-physical layer. In this way, the coding of the physical layer can be efficiently performed.

FIG. 1 is a diagram illustrating a configuration of a general broadband wireless communication network (W-CDMA), and illustrates an example of a UTRAN (UTMS Terrestrial Radio Access Network).

As shown in FIG. 1, an asynchronous mobile communication network (UTRAN) includes an asynchronous mobile station (UE) 10, an asynchronous radio network (RNS) 20, and a wireless communication core network. (For example, the European asynchronous GSM-MAP core network 30 is organically connected and configured, and the protocol stack structure in each interworking structure is shown in FIG.

Here, an efficient hybrid ARQ II / III scheme is a technique applied between the mobile station 10 and the asynchronous radio network 20, and is used when a request is made from the receiving side to the transmitting side when there is an error in the received data. Technology.

In general, the asynchronous mobile communication system (UTRAN: UMTS Terrestrial RadioAccess Network (UTRAN) checks the data transmitted from the transmitting side to the receiving side, if there is an error in the received data (data), There is an Automatic Repeat ReQuest (ARQ) method, which is divided into three types: Automatic Retransmission Request (ARQ) types I, II, and III. The technical characteristics of each method are as follows.

Automatic retransmission request (ARQ) is an error control protocol that automatically detects that an error occurred during transmission and receives the block in which the error occurred. That is, one of the error control methods in data transmission is a system that automatically generates a retransmission request signal when an error is detected and retransmits it from a wrong signal.

In the next generation mobile communication system, an ARQ scheme for requesting retransmission of an error-prone packet may be used to transmit packet data.

However, due to the instability of the wireless channel environment, when using this ARQ scheme, the number of retransmission requests may increase, thereby reducing throughput, which is an amount of data that can be sent in unit time. Therefore, in order to reduce such a problem, ARQ can be used together with a Forward Error Correction Coding (FEC) method, which is called a hybrid ARQ.

Hybrid ARQs include types I, II, and III according to the scheme.

In the case of hybrid type I, one coding rate (e.g., No Coding, Rate 1/2, Rate 1 / in convolutional coding) according to the channel environment or required Quality of Service (QoS). If one of the 3) is determined, it continues to use it, and the receiving end removes the previously received data upon retransmission request, and the transmitting end retransmits it at the previously transmitted coding rate. In this case, since the coding rate does not change according to the variable channel environment, the throughput may be reduced compared to Types II and III.

In the case of hybrid type II, when the receiver requests retransmission of data, the receiver does not remove the data, but stores the data in a buffer and combines the retransmitted data. That is, the first coding rate is transmitted at a high coding rate, and when retransmission is requested, the coding rate is transmitted at a lower coding rate, thereby combining with previously received data. performance can be significantly improved compared to Type I by performing maximal ratio combining. For example, if there is a mother code having a convolutional coding rate of 1/4, the punching rate is used to make a coding rate of 8/9, 2/3, 1 A coding rate such as / 4 can be created, which is called a "Rate Compatible Punctured Convolutional" code. This is shown in FIG. 3.

Meanwhile, a code obtained by punching a turbo code is called a "Rate Compatible Punctured Turbo" code. In the first transmission, if the transmission rate is transmitted at a coding rate of 8/9, and the retransmission relationship is ver (0), the CRC (Cyclic Redundancy Check) is checked and an error is found. It will store it in a buffer and request a retransmission. In this case, retransmission is performed at a coding rate of 2/3, and the retransmission relation is ver (1). Here, the receiving end combines ver (0) stored in the buffer and ver (1) received, and decodes this value to check the CRC. Repeat this process until no error is found in the CRC test, and the recently transmitted ver (n) is combined with the previously transmitted ver (n-a) (0 <a ≦ n).

Hybrid type III is almost the same as hybrid type II. The difference is that before recombining the retransmitted data, ver (n) with ver (na), first decode and then check the CRC. Otherwise, this value is sent to the upper layer. If an error occurs, it is combined with ver (n-a) and the CRC is checked to determine whether to retransmit.

As such, in the asynchronous W-CDMA system, a hybrid ARQ II / III method is used for efficient data transmission. Hybrid ARQ II / III schemes are initially coded at high rates, and are recoded at low rates when retransmitted and combined at the receiving end for throughput. ). Therefore, in order to combine, the protocol data unit (PDU) sequence number, the number of retransmissions, and the version must be known in advance, and the information can be obtained at a low coding rate regardless of the retransmission coding rate. The coding rate should be used to ensure quality.

As described above, in the case of Hybrid ARQ Type II / III, an error about a header portion of the RLC-PDU (Radio Link Control-Protocol Data Unit) is transmitted at a high coding rate in the initial transmission. The likelihood of an error increases. Therefore, it is necessary to more stably transmit a retransmission relationship number and a sequence number included in the RLC-PDU header. In this manner, the RLC-HARQ-Control-PDU may be created using RLC-PDUs according to data and header information of the PDUs. In this case, the header information can be transmitted more stably, but since the information in the PDU is unknown in the physical layer, the retransmission relationship number required for coding cannot be known.

In summary, in order to efficiently support Hybrid ARQ type II / III, RLC-HARQ-control-PDU is generated from RLC-PDU generated by RLC and its header information, and the information contained in the header can be viewed more. Stable transmission In this case, when coding is performed on the RLC-PDU as shown in FIG. 3, the coding rate should be variable by punching according to a retransmission relationship number. Since the layer cannot check the retransmission relationship number included in the side information (SI) transport block according to the RLC-HARQ-control-PDU, the primitive ( Must be sent in the form of a primitive parameter. Therefore, a retransmission relationship number is added to primitives between RLC-MACs transmitting RLC-PDUs and primitives between MAC-physical layers, or RLC-transmitting RLC-HARQ-control-PDUs. A retransmission relationship number should be added to primitives between MACs and primitives between MAC and physical layers.

Therefore, in order to efficiently support Hybrid ARQ type II / III in an asynchronous W-CDMA system, it is necessary to add a retransmission relationship number (version number) to each primitive (RLC-MAC, MAC-physical layer) and transfer method thereof. Is required.

The present invention has been proposed in order to meet the above-mentioned requirements. In the implementation of Hybrid ARQ type II / III for efficient packet data service in a wireless communication system, between layers (RLC-MAC, MAC-physical layer) A data transfer method for efficiently performing physical layer coding and a computer-readable recording medium recording a program for realizing the method by transmitting a retransmission relationship number to a primitive The purpose is to provide.

1 is an exemplary configuration diagram of a general broadband wireless communication network (W-CDMA).

2 is a protocol stack diagram of a general asynchronous mobile communication system (UTRAN).

3 is an explanatory diagram showing a general RCPC or RCPT code.

4 is a flowchart of an embodiment of a data delivery method according to the present invention;

5 is a flowchart of another embodiment of a data delivery method according to the present invention;

6 is a flowchart of another embodiment of a data delivery method according to the present invention;

* Explanation of symbols for the main parts of the drawings

10: mobile station (UE) 20: asynchronous radio network (RNC)

30: wireless communication core network

In order to achieve the above object, the present invention provides a data transfer method in a hybrid ARQ type II / III application, which is a hybrid automatic retransmission request for efficient data transmission in a wireless communication system. In a layer, adding a retransmission relationship number to a primitive between an RLC layer and a medium access control (MAC) layer and delivering it to the MAC layer through a logical channel; A second step of adding a retransmission relationship number to a primitive between the MAC layer and the physical layer in the MAC layer, and transmitting it to the physical layer through a transport channel; And a third step of encoding, by the physical layer, a data transmission block transmitted through a transport channel by using a retransmission relationship number transmitted through a primitive between the MAC layer and the physical layer. do.

Meanwhile, the present invention provides a wireless ARQ type II / III (hybrid ARQ type II / III) for hybrid automatic retransmission request for efficient data transmission, in a radio link control (RLC) layer, in an RLC layer. A first function of adding a retransmission relationship number to a primitive between a MAC and a Medium Access Control (MAC) layer and transmitting the same to the MAC layer through a logical channel; A second function of adding a retransmission relationship number to a primitive between the MAC layer and the physical layer in the MAC layer and transmitting the version number to the physical layer through a transport channel; And a program for realizing a third function of encoding a data transport block transmitted through a transport channel by using a retransmission relationship number transmitted through a primitive between the MAC layer and the physical layer in the physical layer. Provide a computer readable recording medium.

In order to support Hybrid ARQ type II / III, puncturing of a coded value should be performed according to a retransmission relationship number in the physical layer, and to support this, a retransmission relationship number (version number) Must be transmitted in the form of a primitive parameter that can be identified at the physical layer. Accordingly, the present invention adds a retransmission relationship number to the primitives between the RLC-MACs and the primitives between the MAC-physical layers.

The above objects, features and advantages will become more apparent from the following detailed description taken in conjunction with the accompanying drawings. Hereinafter, exemplary embodiments of the present invention will be described in detail with reference to the accompanying drawings.

In the present invention, the following notation is used in each layer (RLC, MAC, Node B).

Data to be transmitted is represented as an RLC-PDU in the RLC layer, a MAC-PDU or a data transport block in the MAC layer, and a data transport block in the physical layer.

Meanwhile, side information including header information is transmitted from the RLC layer to the RLC-HARQ-control-PDU, and the MAC layer transmits the MAC-HARQ-control-PDU or side information (SI). In the block (transport block) and the physical layer in the SI transport block (transport block).

In the case of the asynchronous mobile communication system (UTRAN), it has a protocol stack structure as shown in FIG. 2, and exchanges data between each protocol entity using SAP and primitives. At this time, the primitives used are provided with necessary parameters in addition to the data exchanged to facilitate smooth interworking between protocol layers. The basic types of primitives used between protocol entities are as follows.

"MAC-data-REQ" and "MAC-data-IND" are used between the RLC protocol entity and the MAC protocol entity. Here, MAC-data-REQ is used for transmitting data from the RLC protocol entity to the MAC protocol entity, and MAC-data-IND is used for transmitting data from the MAC protocol entity to the RLC protocol entity.

Meanwhile, "PHY-data-REQ" and "PHY-data-IND" are used between the MAC protocol entity and the physical layer. Here, PHY-data-REQ is used to transmit data from the MAC protocol entity to the physical layer, and PHY-data-IND is used to transmit data from the physical layer to the MAC protocol entity.

4 to 6 below correspond to downlink, and a Control Radio Radio Controller (CRNC) for managing a common channel of a wireless network (MAC-C / SH (Medium Access Control Common / Shared Entity) is Location) and a Serving Radio Network Controller (SRNC) providing a service to the mobile station (where a Medium Access Control Dedicated Entity (MAC-D) is located) are present at the same or different locations. And, Figure 5 corresponds to the case of uplink (uplink).

Here, MAC-D is a part for processing the general user part in the MAC layer, MAC-C / SH is a part for processing the shared / shared channel part in the MAC layer.

First, when using a downlink shared channel (DSCH) and a dedicated CHannel (DCH) transport channel to transmit a data transport block and an SI transport block with reference to FIG. Let's take a look at the transfer procedure of retransmission relationship number.

As shown in FIG. 4, when a data transport block and an SI transport block are delivered through a downlink shared channel (DSCH) and a dedicated CHannel (DCH) transport channel, retransmission is performed. The addition of a version number may be made to the primitive parameters of the MAC-data-REQ sending the RLC-PDU (401, 402, 404, 405) or to the primitive parameters of the MAC-data-REQ sending the RLC-HARQ-control-PDU. (401, 403, 405).

First, the RLC transmits a retransmission relationship number (version number) to the MAC-D (401). That is, a MAC-data using a Dedicated Traffic Channel (DTCH) logical channel is added by adding a version number to a MAC-data-REQ primitive parameter for an RLC-PDU or an RLC-HARQ-contol-PDU. Pass it to D.

Thereafter, the MAC-D transmits a retransmission relationship number (version number) from the MAC-C / SH (but only when adding a retransmission relationship number (vesion number) to the primitive parameter of the RLC-PDU) (402). That is, the RLC-PDU together with the retransmission relationship number (version number) is transferred to the MAC-C / SH.

The MAC-D transmits a retransmission relationship number (version number) to the physical layer (403). That is, a retransmission relationship number is added to the parameter of the DCH PHY-data-REQ primitive for the SI transport block and transmitted to the physical layer using a DCH transport channel.

Meanwhile, when adding a retransmission relationship number to a primitive parameter of the RLC-PDU, if a retransmission relationship number is transmitted from MAC-D to MAC-C / SH (402), MAC-C / SH In step 404, a retransmission relationship number is transmitted to the physical layer. That is, a retransmission relationship number is added to a parameter of a DSCH PHY-data-REQ primitive for a data transport block and transmitted to a physical layer using a DSCH transport channel.

Finally, in the physical layer, a data transport block delivered to a DSCH transport channel using a retransmission relationship number transmitted through a DSCH PHY-data-REQ or a DCH PHY-data-REQ. (405).

Meanwhile, referring to FIG. 5, when a DCH transport channel is used to transmit a data transport block and an SI transport block, a transfer procedure of a retransmission relationship number will be described. Let's look at it.

As shown in FIG. 5, when transmitting a data transport block and an SI transport block through a DCH transport channel, first, a retransmission relationship number from a RLC to a MAC-D (version number) (501). That is, a retransmission relationship number is added to the MAC-data-REQ primitive parameter for the RLC-PDU or the RLC-HARQ-contol-PDU and transmitted to the MAC-D using a DTCH logical channel.

Thereafter, the MAC-D transmits a retransmission relationship number (version number) to the physical layer (502). That is, a DCH transport channel is added by adding a retransmission relationship number to a parameter of a DCH PHY-data-REQ primitive for a data transport block and / or an SI transport block. Transfer to the physical layer using.

Next, the physical layer encodes a data transport block transmitted through a DCH transport channel using a retransmission relationship number transmitted through the DCH PHY-data-REQ. (503).

On the other hand, referring to Figure 6 when the DSCH transport channel (transport channel) for transmitting the data transport block (transport data) and the SI transport block (transport channel) to use the transmission procedure of the retransmission relationship number (version number) Let's look at it.

As shown in FIG. 6, when transmitting a data transport block and an SI transport block through a DSCH transport channel, first, a retransmission relationship number (version number) from the RLC to the MAC-D is provided. (601). That is, a retransmission relationship number is added to the MAC-data-REQ primitive parameter for the RLC-PDU or the RLC-HARQ-contol-PDU and transmitted to the MAC-D using a DTCH logical channel.

Thereafter, a retransmission relationship number (version number) is transmitted from MAC-D to MAC-C / SH (602). That is, a retransmission relationship number is transmitted to the MAC-C / SH together with the MAC-PDU and the MAC-HARQ-control-PDU.

Next, a retransmission relationship number (version number) is transmitted from the MAC-C / SH to the physical layer (603). That is, a DSCH transport channel is added by adding a version number to a parameter of a DSCH PHY-data-REQ primitive for a data transport block and / or an SI transport block. Transfer to the physical layer using.

Finally, the physical layer encodes a data transport block transmitted through a DSCH transport channel using a DSCH PHY-data-REQ transferred version number (604). ).

The method of the present invention as described above may be implemented as a program and stored in a computer-readable recording medium (CD-ROM, RAM, ROM, floppy disk, hard disk, magneto-optical disk, etc.).

The present invention described above is not limited to the above-described embodiments and the accompanying drawings, and various substitutions, modifications, and changes can be made in the art without departing from the technical spirit of the present invention. It will be apparent to those of ordinary knowledge.

According to the present invention as described above, when the Hybrid ARQ II / III scheme is used, the coding of the physical layer is efficiently performed by adding a retransmission relationship number to the primitive parameter between the RLC-MAC and the MAC-physical layer. There is an effect that can be performed.

Claims (11)

In the data transmission method in the hybrid ARQ type II / III application for the hybrid automatic retransmission request for efficient data transmission in a wireless communication system, A first step of adding a retransmission relationship number to a primitive between an RLC layer and a medium access control (MAC) layer in a radio link control (RLC) layer and transmitting it to the MAC layer through a logical channel; A second step of adding a retransmission relationship number to a primitive between the MAC layer and the physical layer in the MAC layer, and transmitting it to the physical layer through a transport channel; And A third step of encoding a data transmission block delivered to a transport channel by using a retransmission relationship number transmitted through a primitive between the MAC layer and the physical layer in the physical layer; Data transmission method for a hybrid automatic retransmission request 2/3 scheme in a broadband wireless communication system comprising a. The method of claim 1, Adding the retransmission relationship number (version number) of the first step, MAC-data between the RLC layer and the medium access control (MAC) layer transmitting an RLC-PDU (Radio Link Control-Protocol Data Unit) or an RLC-HARQ-control-PDU containing information about the RLC-PDU A data transmission method for a hybrid automatic retransmission request 2/3 scheme in a broadband wireless communication system, characterized by adding a retransmission relationship number to a primitive parameter of REQ. The method of claim 1, Adding the retransmission relationship number (version number) of the second step, Hybrid automatic retransmission request 2/3 scheme in a broadband wireless communication system, wherein a retransmission relationship number is added to a primitive parameter of a PHY-data-REQ transmitting a data transmission block or an additional information (SI) transmission block Data delivery method for business. The method according to any one of claims 1 to 3, The first step is, In the RLC layer, a retransmission relationship number is added to a primitive parameter of the MAC-data-REQ for the RLC-PDU or the RLC-HARQ-control-PDU, through a Dedicated Traffic Channel (DTCH) logical channel. And a medium access control dedicated entity (MAC-D) for processing a general user part in the MAC layer. 2. The method of claim 4, wherein The second step, The MAC-D transmits a retransmission relationship number along with the RLC-PDU to a MAC-C / SH (Medium Access Control Common / Shared Entity) that processes a shared / shared channel portion in the MAC layer. A fourth step of adding a retransmission relationship number to a parameter of a Dedicated CHannel (DCH) PHY-data-REQ primitive for an information (SI) transport block and transmitting it to the physical layer through a DCH transport channel; And A fifth number added to a parameter of a downlink shared channel (DSCH) PHY-data-REQ primitive for a data transport block in the MAC-C / SH to transmit a version number to a physical layer through the DSCH transport channel; step Data transmission method for a hybrid automatic retransmission request 2/3 scheme in a broadband wireless communication system comprising a. The method of claim 5, The third step, The data layer transmits a data transmission block transmitted through a DSCH transmission channel using a retransmission relationship number (version number) transmitted through the DSCH PHY-data-REQ or the DCH PHY-data-REQ in the physical layer. Data transmission method for hybrid automatic retransmission request 2/3 in wideband wireless communication system. The method of claim 4, wherein The second step, The MAC-D adds a retransmission relationship number (version number) to a parameter of a dedicated CHannel (DCH) PHY-data-REQ primitive for a data transport block or a side information (SI) transport block and transmits the physical layer through the DCH transport channel. A data transmission method for a hybrid automatic retransmission request 2/3 method in a broadband wireless communication system, characterized in that for transmitting. The method of claim 7, wherein The third step, In a wideband wireless communication system, a data transmission block transmitted through a DCH transport channel is encoded using a retransmission relationship number transmitted through a DCH PHY-data-REQ in the physical layer. Data delivery method for hybrid automatic retransmission request 2/3 method. The method of claim 4, wherein The second step, The MAC-C / SH (Medium Access Control Common / Shared Entity) that processes the shared / shared channel part in the MAC layer in the MAC-D, together with the MAC-PDU and the MAC-HARQ-control-PDU, retransmission relationship number (version) a fourth step of delivering number); And In the MAC-C / SH, a retransmission relationship number is added to a parameter of a downlink shared channel (DSCH) PHY-data-REQ primitive for a data transport block or a side information (SI) transport block, and then a DSCH transport channel is added. A fifth step of transferring to the physical layer Data transmission method for a hybrid automatic retransmission request 2/3 scheme in a broadband wireless communication system comprising a. The method of claim 9, The third step, Hybrid automatic retransmission request in a wideband wireless communication system, characterized in that the data transmission block transmitted to the DSCH transmission channel is encoded using a retransmission relationship number transmitted from the DSCH PHY-data-REQ in the physical layer. Data delivery method for three methods. In order to implement Hybrid ARQ type II / III (Hybrid ARQ type II / III) for efficient data transmission, A first function of adding a retransmission relationship number to a primitive between an RLC layer and a medium access control (MAC) layer in a radio link control (RLC) layer and transmitting the version number to a MAC layer through a logical channel; A second function of adding a retransmission relationship number to a primitive between the MAC layer and the physical layer in the MAC layer and transmitting the version number to the physical layer through a transport channel; And A third function of encoding a data transport block transmitted through a transport channel using a version number transmitted through a primitive between the MAC layer and the physical layer in the physical layer A computer-readable recording medium having recorded thereon a program for realizing this.