KR20060039843A - Base station and subscriber station for efficiently transmitting message and methods thereof - Google Patents

Abstract

In the wireless access communication system employing the HARQ transmission scheme, the present invention is configured such that the terminal transmits "MSS buffer capability" information, which is the memory capability of the terminal supporting HARQ, to the base station. The terminal buffer capability information may be transmitted to the base station in an initialization phase, a handoff phase, etc. between the terminal and the base station. The base station allocates downlink HARQ burst information based on the memory capability of the terminal. Accordingly, inappropriate downlink HARQ burst allocation at the base station can be prevented.

Terminal buffer capability, HARQ

Description

BASE STATION AND SUBSCRIBER STATION FOR EFFICIENTLY TRANSMITTING MESSAGE AND METHODS THEREOF             

1 is a block diagram illustrating a general broadband wireless access communication system;

2 is a diagram illustrating a configuration of a conventional HARQ encoder packet;

3 is a diagram for explaining a HARQ scheme in a broadband wireless access communication system;

4 is a view for explaining an IR scheme according to FEC coding;

5 is a flowchart illustrating a message for transmitting a memory capability of a terminal during an initialization step between a terminal and a base station according to an embodiment of the present invention;

6 is a diagram showing an index value corresponding to MSS buffer capability according to an embodiment of the present invention;

7 is a diagram showing an MSS buffer capability value according to an embodiment of the present invention;

FIG. 8 is a diagram illustrating SS capability encodings including such MSS buffer capability. FIG.

9 is a block diagram of a terminal according to an embodiment of the present invention;                 

10 is a diagram illustrating a buffer capability information processing procedure in a terminal according to an embodiment of the present invention;

11 is a diagram illustrating a format configuration IE;

12 illustrates a CQICH control IE;

13 is a block diagram of a base station according to an embodiment of the present invention;

14 is a diagram illustrating a buffer capability information processing procedure at a base station according to an embodiment of the present invention.

The present invention relates to a base station, a terminal, and a method for efficient message transmission in a wireless access communication system.

1 is a diagram illustrating a configuration of a general broadband wireless access communication system. Referring to FIG. 1, each mobile subscriber station (MSS) 10, 12 is generally mobile and is connected to a backbone network 30 through a base station (BS) 20, 22, respectively. The terminals 10 and 12 allow access between the base stations 20 and 22 and the subscribers. Base stations 20 and 22 provide control, management, and connectivity to terminals 10 and 12. The backbone network 30 is connected to an authentication and service authorization server (ASA) 40 for authentication and service authentication of the terminals 10 and 12.

The wireless access communication system configured as described above may adopt a hybrid automatic request (HARQ) scheme to ensure data transmission between the base stations 20 and 22 and the terminals 10 and 12. The HARQ scheme is an optional function of the MAC supporting the broadband wireless access communication system and may be performed on a per-terminal basis. The HARQ scheme is a data transmission scheme proposed to have a stronger error correction capability for a data transmission channel by adding a forward error correction (FEC) to the existing ARQ scheme. The HARQ scheme is a mixture of an ARQ scheme for transmitting an ACK for data reception and an FEC scheme for inserting an error correction code into the transmitted data.

Meanwhile, in order to properly operate the HARQ scheme in the broadband wireless access communication system, the terminal (hereinafter referred to as MSS) and the base station (hereinafter referred to as BS) exchange parameters necessary for HARQ transmission in an initialization step. One or more MAC PDUs may be concatenated for such H-ARQ transmission, and a HARQ encoder packet (also referred to as Hep) is formed by adding a cyclic redundancy check (CRC) for error detection to these concatenated results. 2 is a diagram illustrating a configuration of a conventional HARQ encoder packet. Referring to FIG. 2, Hep includes one or more MAC PDUs 2, CRC 4, and parity bits 6. A case in which the base station transmits such a Hep to the terminal through the HARQ scheme will be described with reference to FIG. 3.

3 is a view for explaining the HARQ scheme in a broadband wireless access communication system. Referring to FIG. 3, the base station 20 transmits an HARQ encoder packet to the terminal 10 in step 60. When the terminal 10 receives the HARQ encoder packet, the terminal 10 proceeds to step 62 and attempts to demodulate the HARQ encoder packet. In step 64, the terminal 10 determines whether demodulation of the HARQ encoder packet is successful. If demodulation succeeds, the terminal 10 transmits an ACK to the base station 20 in step 66. However, if demodulation fails, the terminal 10 transmits a NAK to the base station in step 68. When the base station 20 receives the NAK, the base station 20 attempts to transmit a second HARQ to the terminal 10. The base station 20 may repeat the transmission of HARQ until the terminal 10 successfully demodulates the corresponding Hep and transmits an ACK.

Meanwhile, the HARQ scheme employs a CC (Chase Combining) scheme and an IR (Incremental Redundancy) scheme to efficiently combine existing received data and retransmitted received data to increase decoding performance. Of these, the IR method will be described with reference to FIG. 4.

4 is a view for explaining an IR scheme according to FEC coding. For reference, since the Chase combining method is a part of the IR method, only the IR method will be described in connection with FIG. 4. Referring to FIG. 4, if the data 70 is coded at 1/3 FEC coding rate, the data is of length as shown in the upper part of FIG. 4 and coded at 1/6 FEC coding rate. Data of length as shown in the lower part of FIG. That is, the FEC-coded data consists of systematic bits 70, which are actual data, and redundancy bits 80, for error recovery. When transmitting such FEC coded data according to an IR scheme, a plurality of transmission data versions exist. For example, suppose there are two versions of the transmit data version for 1/3 FEC coded data, the first version of the transmit data is part of the systematic bits (70) and part a of the redundancy bits (80) for error recovery. The second transmission data consists of systematic bits 70 and part b of redundancy bits 80 for error recovery. For example, the base stations 20 and 22 transmit the first version of the transmission data to the terminals 10 and 12 and then receive the NAK from the terminals 10 and 12 and then transmit the second version of the transmission data. The terminal 10, 12 performs demodulation using part (a) of the redundancy bits 80 when receiving the first version of the transmission data, and part of the redundancy bits 80 when receiving the second version of the transmission data. Demodulation is performed by combining a and b. Accordingly, the redundancy bits 80 for error correction increase as the number of retransmissions increases, thereby increasing the error correction success rate.

In order to indicate a new Hep transmission after successful transmission of the Hep in this IR scheme, a 1-bit HARQ identifier sequence number (AI_SN) is transmitted while being toggled between 0 and 1 values for each HARQ transmission attempt. When the UE detects that the AI_SN value has been changed, it recognizes that this HARQ transmission attempt delivers a new Hep.

Meanwhile, the HARQ transmission method basically operates as a SAW (Stop and Wait) protocol. The HARQ DL ACK delay offset parameter is included in a DCD message transmitted irregularly from the base stations 20 and 22 to the terminal 10. The DCD message is a broadcast message including information indicating a downlink channel status, that is, an AMC table, system parameters, and the like.                         

When the terminal 10 or 12 receives a successful Hep, the terminal 10 or 12 transmits the ACK after a delay equal to the HARQ DL ACK delay offset parameter value when transmitting the ACK to the base station 20 or 22 as a response. However, unlike ACK transmission, the retransmission time point of Hep is not fixed. The terminals 10 and 12 transmit ACK / NAK through HARQ bitmap.

In addition, the HARQ transmission scheme may allocate a plurality of HARQ channels to one HARQ-enabled terminal. How many HARQ channels are used is determined by the base station. These HARQ channels may be distinguished from each other by HARQ channel identifier (ACID). The reason why the HARQ scheme is used is that HARQ has a strong error correction capability against channel state and interference change compared to the conventional ARQ scheme. That is, the HARQ scheme can improve performance due to the SNR gain and time diversity effects caused by combining the received packet in error state and the retransmitted packet.

In this H-ARQ transmission scheme, the UE and the base station negotiate related parameters for more efficient HARQ operation. In this case, in order for the terminal to smoothly receive downlink HARQ data from the base station, a memory to be used for combining and a memory to be used for reordering performed to deliver successfully demodulated downlink MAC PDUs to its upper layer in the order of the base station transmission. It must be fully equipped. However, the memory capability of the terminal to support the H-ARQ is not discussed in the negotiation process between the terminal and the base station mentioned above. The size of the H-ARQ encoder packet that can be received may be determined according to the memory capability of the terminal supporting the H-ARQ. However, if the base station side does not know the memory capacity for the HARQ operation of the MSS, the UE may allocate a downlink HARQ packet that the terminal does not receive properly. In this case, even if the channel state between the MSS and the BS gradually improves, unnecessary retransmission may occur because the demodulation process may not be performed properly due to insufficient memory of the terminal. In addition, this retransmission requires additional resource allocation and increases traffic transmission delay.

Accordingly, an object of the present invention is to improve data transmission efficiency between a terminal and a base station in a broadband wireless access communication system.

In a wireless access communication system according to an embodiment of the present invention, a terminal includes a buffer for storing received data, a message generator for generating a message including its buffer capability information, and the generated message to the predetermined base station. It includes a transmitting and receiving unit.

A method for efficient message transmission in a terminal in a wireless access communication system according to an embodiment of the present invention includes generating a message including its buffer capability information, and transmitting the generated message to the predetermined base station. do.

A base station in a wireless access communication system according to an embodiment of the present invention includes a transceiver for receiving a terminal buffer capability from a terminal and a downlink controller for allocating a downlink HARQ burst according to the terminal buffer capability.

A method for efficient message transmission in a base station in a wireless access communication system according to an embodiment of the present invention includes receiving a terminal buffer capability from a terminal and allocating a downlink HARQ burst according to the terminal buffer capability. .

Hereinafter, exemplary embodiments of the present invention will be described in detail with reference to the accompanying drawings. In addition, detailed descriptions of well-known functions and configurations that may unnecessarily obscure the subject matter of the present invention will be omitted.

In an embodiment of the present invention, in a wireless access communication system employing a HARQ transmission scheme, a terminal is configured to transmit "MSS buffer capability" information, which is a memory capability of a corresponding terminal supporting HARQ, to a base station. The terminal buffer capability information may be transmitted to the base station in an initialization phase, a handoff phase, etc. between the terminal and the base station. The base station allocates downlink HARQ burst information based on the memory capability of the terminal. Accordingly, inappropriate downlink HARQ burst allocation at the base station can be prevented.

5 is a diagram illustrating a message flow for transmitting the memory capability of the terminal during the initialization step between the terminal and the base station according to an embodiment of the present invention.

In a broadband wireless access communication system employing a HARQ transmission scheme according to an embodiment of the present invention, a terminal manages its buffer or memory size to support HARQ. According to an embodiment of the present invention, the terminal includes MSS buffer capability according to the size of its buffer or memory in SS capability encodings, and includes the SS capability encoding in the network entry process. It can transmit to the base station 20. According to another embodiment of the present invention, the terminal may transmit MSS buffer capability according to the size of its buffer or memory to the base station 20 in the handoff process. The time point at which the MSS buffer capability is transmitted to the base station may be any time point at which the base station allocates a downlink HARQ burst to the terminal. Therefore, the timing of transmitting the MSS buffer capability to the base station is not limited to the above embodiments.

Accordingly, the base station 20 allocates downlink HARQ burst information based on the memory capability of the corresponding terminal. Accordingly, inappropriate downlink HARQ burst allocation at the base station can be prevented.

Hereinafter, a detailed network entry process will be described with reference to FIG. 5.

Referring to FIG. 5, the terminal 10 needs to successfully complete a network entry process with a predetermined base station 20 in order to communicate on a network. The network entry process involves downlink (DL) channel synchronization, initial ranging, capabilities negotiation, authentication message exchange, registration and IP connectivity steps ( stages). When the network entry process is completed, the terminal 10 generates one or more service flows and transmits data to the base station 20.

Referring to the capability negotiation step in these network entry processes, after successful completion of the initial ranging, the terminal 10 transmits a capability request message (SS Basic Capability (SBC) -REQ) to the base station 20 in step 100. This capability request message describes the capability of the terminal 10 in relation to the modulation level, coding scheme and rate and duplexing method supported. The base station 20 accepts or rejects the terminal 10 by sending a response message (SBC-RSP) in step 102 based on its capability request message.

When the registration step is described in the network entry process, the terminal 10 registers with the network after successful completion of authentication. In more detail, if the terminal 10 transmits a registration request message (REG-REQ) to the base station 20 in step 110, the base station 20 transmits a registration response to the terminal 10 in step 112.

According to an embodiment of the present invention, the terminal 10 transmits SS capability encoding values including the aforementioned MSS buffer capability through a capability request message (SSBC (SS Basic Capability) -REQ). Transmit to base station 20. According to another embodiment of the present invention, the terminal 10 transmits SS capability encoding values including the MSS buffer capability to the base station 20 through the registration request message REG-REQ. send. Accordingly, in step 120, the base station 20 allocates downlink HARQ burst information based on the memory capability of the terminal.

In addition, according to another embodiment of the present invention, the terminal may transmit an MSS buffer capability according to the size of its buffer or memory to the base station during the handoff process. For example, the terminal performs ranging when handing off to another base station, and may transmit MSS buffer capability information to the base station through an RNG-REQ / RSP message transmitted and received with the base station. The MSS buffer capability may be delivered in the form of information promised between the terminal and the base station, for example, such as a specific index value or an acceptable maximum buffer value (bit number). Then, the base station can know the buffer capacity of the terminal (eg, a value less than the maximum acceptable capacity) depending on the specific index or the maximum buffer value, thereby exceeding the buffer capacity (maximum buffer capacity) of the terminal and downlink HARQ burst HARQ is performed appropriately without worries of allocating / transmitting the MS. As another example, when the terminal sends its total buffer capacity or HARQ buffer capacity, the base station may calculate and allocate only the packet size Nep per HARQ channel to the terminal. Alternatively, if the terminal sends its buffer capacity information as much as the buffer capacity (or packet size (Nep)) per HARQ channel, the base station may accept and transmit the corresponding amount of transmission to the terminal. . In addition, the UE informs its buffer capacity in various ways, and the base station accepts it so that a transmission / reception error does not occur. (Nep is Encoded Packet size, Channel coding Encoder Packet size)

6 illustrates an index value corresponding to MSS buffer capability according to an embodiment of the present invention. Referring to FIG. 6, each unique index corresponds to a buffer capacity. When the terminal 10 transmits this index value to the base station 20, the base station 20 recognizes the buffer capability corresponding to the received index as the capability of the terminal.

FIG. 7 is a diagram illustrating an MSS buffer capability value according to an embodiment of the present invention. FIG. Referring to FIG. 7, the MSS buffer capability may be 1 byte in length, and the value may be an index defining MSS buffer capability as described above. This MSS buffer capability may be transmitted to the base station in the capability negotiation phase or registration phase in the network entry process.

FIG. 8 is a diagram illustrating SS capability encodings including such MSS buffer capability. As shown in Figure 8, the SS capability encoding value includes MSS buffer capability in accordance with the present invention. This SS capability encoding value is included in the capability request message (SBC-REQ) and forwarded to the base station.

Hereinafter, the configuration and operation of the terminal according to an embodiment of the present invention.

9 is a block diagram of a terminal according to an embodiment of the present invention. Referring to FIG. 9, the terminal 300 includes a buffer 302, a buffer manager 304, a buffer capability information processor 306, a message generator 307, and a transceiver 308. The terminal 300 stores the data received from the base station in the buffer 302. The buffer manager 304 supports the HARQ transmission scheme, manages the size of a buffer to be used for reordering, and provides the buffer capacity information processor 306 with available capacity information of the current buffer 302. In addition, the buffer manager 304 sets a memory to demodulate the downlink (DL) HARQ burst and perform reordering based on the available capacity information provided to the buffer capability information processor 306.

 When the buffer capacity information processing unit 306 receives the available capacity of the current buffer 302 from the buffer management unit 304, the buffer capacity information processing unit 306 processes and stores the MSS buffer capability. The buffer capability information processor 306 provides the MSS buffer capability information to the message generator 307. When the message generator 307 receives the MSS buffer capability information from the buffer capability information processor 306, the message generator 307 inserts the MSS buffer capability information into either the SBC-REQ message or the REG-REQ message. According to another exemplary embodiment, the message generator 307 may insert MSS buffer capability information into the MAC management message. According to another embodiment, the message generator 307 may insert the MSS buffer capability information into an RNG-REQ / RSP message transmitted / received with the terminal during handoff.

When the MSS buffer capability information is inserted into the SBC-REQ message, the MSS buffer capability information may be inserted into the SS capability encodings field of the SBC-REQ message. The transceiver 308 transmits an SBC-REQ message, a REG-REQ message, etc. from the message generator 307 to the base station. The transceiver 308 receives an SBC-RSP message or a REG-RSP message, which is a response message to the SBC-REQ message or the REG-REQ message, from the base station.

On the other hand, the configuration of the terminal according to the embodiment of the present invention described above can be changed by those skilled in the art. For example, the buffer manager 304, the buffer capability information processor 306, and the message generator 307 may be configured separately as in the present invention, but may be integrated into one and implemented in the modem of the terminal. Therefore, the present invention is not limited by the terminal configuration according to the above-described embodiment.

10 is a diagram illustrating a process of processing buffer capability information in a terminal according to an embodiment of the present invention. Referring to FIG. 10, when the buffer management unit 304 of the terminal 300 provides the available capacity information of its buffer to the buffer capability information processing unit 306 in step 310, the buffer capability information processing unit 306 may determine the size of the buffer. The available capacity information is processed and stored in MSS buffer capability. If the message generator 307 inserts the MSS buffer capability information into the SBC-REQ message or the REG-REQ message in step 312, the transceiver 308 transmits the SBC-REQ message or the REG-REQ message to the base station. Subsequently, the terminal 300 checks whether the SBC-RSP or REG-RSP message is received from the base station in step 313. Upon receiving the SBC-RSP or REG-RSP message, the terminal 300 confirms the approval of the MSS buffer capability information transmitted by the terminal 300. Subsequently, the terminal 300 receives a downlink HARQ burst through the Compact DL-MAP IE after receiving the downlink HARQ subpacket in step 314 after entering the state where normal service is available. The terminal 300 uses the format configuration IE and the CQICH control IE shown in FIGS. 11 and 12 transmitted from the base station to receive the appropriate downlink HARQ packet. That is, the terminal 300 uses HARQ-related control information transmitted from the base station.

In step 316, the terminal 300 determines whether reception of the downlink HARQ burst is successful. If the reception of the downlink HARQ burst is successful, the terminal 300 proceeds to step 320 to transmit an ACK to the base station. If the reception of the downlink HARQ burst fails, the terminal 300 proceeds to step 318 to transmit a NAK to the base station. Retransmission of the corresponding HARQ packet is requested. The terminal 300 may perform combining on the HARQ subpacket when demodulating the HARQ packet.

Hereinafter, the configuration and operation of a base station according to an embodiment of the present invention.

13 is a block diagram of a base station according to an embodiment of the present invention. Referring to FIG. 13, the base station 400 includes a transceiver 402, a buffer capability information processor 404, a downlink controller 406, and a message generator 408. The transceiver 402 receives an SBC-REQ message or a REG-REQ message from the terminal 300. The buffer capability information processor 404 extracts and stores an MSS buffer capability value from the received SBC-REQ message or REG-REQ message. The buffer capability information processing unit 404 provides the MSS buffer capability value to the downlink control unit 406. The downlink controller 406 performs downlink HARQ burst size, number of HARQ channels, and scheduling based on MSS buffer capability information provided from the terminal 300.

Meanwhile, the message generator 408 forms a response message SBC-RSP message or REG-RSP message for the received SBC-REQ message or REG-REQ message and provides the message to the transceiver 402. The transceiver 402 transmits an SBC-RSP message or a REG-RSP message from the message generator 408 to the terminal 300.

14 is a diagram illustrating a buffer capability information processing procedure in a base station according to an embodiment of the present invention. Referring to FIG. 14, the transceiver 402 of the base station 400 transmits the format configuration IE information to the terminal 300 to the terminal 300 in step 410. Subsequently, the base station 400 determines whether to receive buffer capability information from the terminal in step 412. For example, the buffer capability information processor 404 of the base station 400 extracts and stores the MSS buffer capability information through the SEB-REQ message or the REG-REQ message. Subsequently, the downlink controller 406 of the base station 400 allocates the downlink HARQ burst of the corresponding terminal according to the buffer capability information received in step 414. As described above, the buffer capability information may be an index corresponding to the buffer capability. At this time, when allocating the downlink HARQ burst, an appropriate amount of HARQ burst is allocated to the corresponding UE through the following method.

Specifically, the default N _EP size for index / 16 = 0, which is buffer capacity information, is 144, and the default N _EP size is 192 for index 1, and thus the N _EP size is determined for the index, which is buffer capacity information. Finally, the default N _EP size for index / 16 = 13 is 2400. The base station 400 should not allocate more bits than the (default N _EP size corresponding to the signaled index) * ((index% 16) +1) as a downlink HARQ burst for the terminal. The base station 400 must also allocate a downlink HARQ burst for the terminal notifying its HARQ buffer capability index i (i = 0, ..., 223) as follows.

If M * S ≦ (default size corresponding to i) * ((i% 16) +1), the base station may allocate an M HARQ channel to the MSS, and N _EP = S for each HARQ channel. You can send bits. Here, M means the number of HARQ channel (s) that the base station can actually allocate to the MSS. S denotes the actual N _EP allocated to the terminal by the base station, and may not be the same as the default size for the index informed by the terminal to the base station.

As another example, the terminal sends a negotiation field of 8 bits, and 0 or 1 is set as the upper 4 bits. Here, 0 may represent the total buffer capacity, and 1 may represent the buffer capacity per HARQ channel. The buffer capacity may be expressed as the next 4 bits or as Nep. (Of course 0 and 1 might change). Number of HARQ channels can also be negotiated using about 1 byte in the same or different fields. In the case of the total buffer capacity, the base station interprets it as (Number of HARQ channels) * (number of bits corresponding to Nep), and in case of buffer capacity per HARQ channel, it can be interpreted as (number of bits corresponding to Nep) per HARQ channel Can be. Here, the number of bits corresponding to Nep is only one example, and any value may be sufficient as long as the number of bits promised between the terminal and the base station.

On the other hand, as another example, the buffer capability information of the terminal is reserved b7-b5 corresponding to the upper 3 bits of the 8 bits as a reserved area (reserved), the next b4 indicates whether or not the aggregate buffer capacity, and The next four bits of b3-b0 may indicate and transmit the number of bits (or packet size Nep). The buffer capability information of the terminal can be displayed in a manner similar to or similar to that described above for downlink as well as uplink. For example, capacity information may be delivered to downlink and / or uplink in SBC or RNG. For example, a total of 2 bytes may be allocated, and the first 1 byte may be transmitted by indicating a downlink (DL) and then one byte uplink (UL).

Subsequently, the downlink controller 406 of the base station 400 transmits HARQ burst information of the specific terminal allocated in step 416 to the terminal through the compact DL-MAP IE, and also allows the terminal 300 to correctly receive the HARQ burst. Transfers HARQ control IE control information. The base station 400 determines whether an ACK has been received from the terminal. If the ACK is received from the UE, the flow proceeds to step 422 to transmit the next HARQ packet. If there is no response from the terminal within a predetermined time or if the NAK is received, the base station 400 proceeds to step 424 to retransmit the corresponding HARQ packet.

In the above description of the present invention, specific embodiments have been described, but various modifications may be made without departing from the scope of the present invention. Therefore, the scope of the present invention should not be defined by the described embodiments, but should be determined by the equivalent of claims and claims.

According to the present invention as described above, the MSS buffer Capability parameter is transmitted to the BS in the initialization phase of the terminal and the base station. This signaling method does not increase the additional message signaling complexity by using existing SBC-REQ / SBC-RSP and REG-REQ / REG-RSP message exchange methods. Through the signaling of the MSS buffer capability parameter, the base station determines the memory capacity of the MSS to which the downlink HARQ burst is allocated. Based on this parameter value, the BS assigns the appropriate size HARQ burst to the MSS. do. The MSS performs a normal HARQ reception operation in receiving downlink HARQ bursts of an appropriate size for its memory capacity, and significantly reduces the possibility of receiving HARQ bursts exceeding its memory capacity. The HARQ burst is received by utilizing the original characteristics to the maximum. The retransmission request is minimized through the downlink HARQ burst reception and demodulation process that utilizes the characteristics of HARQ. Minimization of the retransmission request leads to efficient use of resources, which can minimize the delay of the corresponding traffic transmission. If the present invention is not applied, the possibility of not making full use of HARQ's inherent error correction capability may increase, resulting in increased retransmission requirements, inefficient use of resources, and delayed traffic transmission. Can be.

Claims (32)

A terminal in a wireless access communication system, A buffer to store the received data,  A message generator for generating a message including its buffer capability information, And a transceiver for transmitting the generated message to the predetermined base station. The terminal of claim 1, wherein the message generator generates a capability request message (SBC-REQ) including the buffer capability information. The terminal of claim 2, wherein the message generator includes the buffer capability information in an SS capability encoding value of the capability request message. The terminal of claim 1, wherein the message generator generates a registration request message (REG-REQ) including the buffer capability information. The terminal of claim 1, wherein the message generator generates a MAC management message including the buffer capability information. The terminal of claim 1, wherein the message generator generates a ranging request message (RNG-REQ) including the buffer capability information. The terminal of claim 1, wherein the terminal uses the buffer for CC combining or incremental redundancy combining or reordering. The terminal of claim 1, further comprising a buffer manager configured to set a memory to demodulate downlink (DL) HARQ bursts and perform reordering according to the transmitted buffer capacity. A terminal in a wireless access communication system, Generating a message including its buffer capability information, Transmitting the generated message to the predetermined base station. 10. The method of claim 9, wherein generating the message comprises generating a capability request message (SBC-REQ) including the buffer capability information. 11. The method of claim 10, wherein generating the message further comprises including the buffer capability information in an SS capability encoding value of the capability request message. 10. The method of claim 9, wherein generating the message comprises generating a registration request message (REG-REQ) including the buffer capability information. 10. The method of claim 9, wherein generating the message comprises generating a MAC management message including the buffer capability information. 10. The method of claim 9, wherein generating the message comprises generating a ranging request message (RNG-REQ) including the buffer capability information. 10. The method of claim 9, wherein the buffer capacity information thereof is at least one of a specific index or a maximum buffer capacity (maximum number of acceptable bits) promised with the base station. The method of claim 9, wherein the buffer capacity information of the own A method comprising: one or a combination of its total buffer capacity, a buffer capacity for HARQ, or a buffer capacity (or packet size Nep) per HARQ channel. 17. The method of claim 15 or 16, wherein the base station allocates and transmits a corresponding amount of transmission to the terminal depending on the buffer capacity information of the terminal. The method according to claim 15 or 16, wherein the base station allocates and transmits a transmission amount corresponding to a buffer capacity (or packet size Nep) per HARQ channel to the terminal depending on the buffer capacity information of the terminal. . A base station in a wireless access communication system, A transceiver for receiving a terminal buffer capability from the terminal; And a downlink controller for calculating and assigning a downlink HARQ burst according to the terminal buffer capability. 20. The base station of claim 19, wherein the terminal buffer capability information is transmitted through a capability request message (SBC-REQ). 20. The base station of claim 19, wherein the terminal buffer capability information is transmitted through a registration request message (REG-REQ). 20. The base station of claim 19, wherein the terminal buffer capability information is transmitted through a MAC management message. 20. The base station of claim 19, wherein the terminal buffer capability information is transmitted through a ranging request message (RNG-REQ). A base station in a wireless access communication system, Receiving a terminal buffer capability from the terminal; Allocating a downlink HARQ burst according to the terminal buffer capability. 25. The method of claim 24, wherein the terminal buffer capability information is transmitted via a capability request message (SBC-REQ). The method of claim 24, wherein the terminal buffer capability information is transmitted through a registration request message (REG-REQ). The method of claim 24, wherein the terminal buffer capability information is transmitted through a MAC management message (REG-REQ). 25. The method of claim 24, wherein the terminal buffer capability information is transmitted via a ranging request message (RNG-REQ). 25. The method of claim 24, wherein the downlink HARQ burst size does not exceed a buffer capacity or a maximum buffer capacity of the terminal. 25. The method of claim 24, wherein the buffer capability information of the terminal is one or a combination of its total buffer capacity, HARQ buffer capacity, or buffer capacity per HARQ channel (or packet size Nep). Characterized in that the method. 31. The method of claim 30, wherein the base station allocates and transmits corresponding transmission amount to the terminal depending on the buffer capacity information of the terminal. 31. The method of claim 30, wherein the base station allocates and transmits a transmission amount corresponding to only one buffer capacity (or packet size Nep) per HARQ channel, depending on the buffer capacity information of the terminal.

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