KR20100094924A - Method for performing hybrid automatic repeat request operation in wireless mobile communication system - Google Patents

Abstract

PURPOSE: A hybrid automatic retransmission request operation method in a wireless mobile communications system is provided to flexibly execute a HARQ transmission operation by flexibly configurating a HARQ operation timing. CONSTITUTION: A transmitting end transmits data burst allocation information and DL data burst through a DL frequency band in the first DL sub-frame(300) of i-th frame. A receiving end transmits HARQ feedback through a UL frequency band in 5th UL sub-frame(310) of i-th frame. The retransmission of data burst according to the HARQ feedback is executed in the first DL sub-frame(320) of the i+1 frame with the transmitting end. The feedback for the retransmission is executed in the fifth DL sub-frame(330) of the (i+1)-th frame.

Description

METHODO FOR PERFORMING HYBRID AUTOMATIC REPEAT REQUEST OPERATION IN WIRELESS MOBILE COMMUNICATION SYSTEM}

The present invention relates to a wireless mobile communication system, and more particularly, to a method of performing a hybrid automatic repeat request (HARQ) operation in a wireless mobile communication system.

The wireless mobile communication system has been developed in the form of providing various services such as broadcasting, multimedia image, multimedia message to the user. In particular, next generation wireless mobile communication systems are being developed to provide data services of 100 Mbps or more for users moving at high speed, and 1 Gbps or more data services for users moving at low speed.

In a wireless mobile communication system, a base station (BS) and a mobile station (MS) need to reduce control overhead and short latency to transmit and receive reliable data at high speed. A hybrid automatic repeat request (HARQ) scheme may be considered as a method for reducing the control overhead and supporting short latency.

In a wireless mobile communication system using the HARQ scheme, when a transmitting end transmits a signal including data, the receiving end transmits an acknowledgment (ACK) or a negative acknowledgment (NACK) indicating whether the data is normally received to the transmitting end. . The transmitting end initially transmits new data according to the reception of the ACK or NACK or retransmits previously transmitted data according to the HARQ scheme. Here, the HARQ scheme may be a Chase Combining (CC) scheme or an Incremental Redundancy (IR) scheme.

In the conventional HARQ scheme, since the transmission / reception operation is performed in units of frames, the short latency cannot be satisfied. Therefore, there is a need for a new frame structure for transmitting and receiving a signal that satisfies shorter latency and a HARQ operation timing structure according to the new frame structure.

The present invention provides a method of controlling HARQ operation in a wireless mobile communication system.

The present invention provides a method for determining a transmission or retransmission timing of a data burst after receiving a HARQ feedback signal in a wireless mobile communication system.

The present invention provides a method for flexibly determining the HARQ operation timing according to the length of a data burst transmission interval and system capability in a wireless mobile communication system.

The first method of the present invention; A method for operating a hybrid automatic repeat request (HARQ) in a wireless mobile communication system using frames consisting of a plurality of subframes for communication in accordance with a frequency division multiplexing (FDD) method,

Data burst allocation information is transmitted through DL downlink (DL) subframe of frame i and data burst through at least one subframe including downlink subframe m of frame i. Transmitting the data, receiving the feedback on the data burst through the n uplink subframe of the j frame after the i frame, and in response to the feedback, the m downlink of the k frame in response to the feedback. And transmitting or retransmitting a data burst through at least one subframe including the subframe.

The second method of the present invention; A method for operating a hybrid automatic repeat request (HARQ) in a wireless mobile communication system using frames consisting of a plurality of subframes for communication in accordance with a frequency division multiplexing (FDD) method,

transmitting data burst assignment information through downlink subframe l of frame i and receiving data burst through at least one subframe including downlink subframe m of frame i And transmitting feedback indicating whether the data burst has been successfully received through the n uplink subframe of the j frame after the i frame, and m down in the k frame according to the feedback. Receiving a burst of data transmitted or retransmitted through at least one subframe including the link subframe.

The third method of the present invention; A method for operating a hybrid automatic repeat request (HARQ) in a wireless mobile communication system using frames consisting of a plurality of subframes for communication in accordance with a frequency division multiplexing (FDD) method,

at least one subframe including transmitting data burst assignment information through downlink subframe l of frame i, and uplink subframe m of frame j after frame i Receiving a data burst through the, and after the j frame, the step of transmitting a feedback indicating whether the success of the data burst through the l downlink subframe of the frame k, and the feedback, corresponding to the feedback, and receiving the data burst transmitted or retransmitted through at least one subframe including the downlink subframe m of the p frame.

Fourth method of the present invention; A method for operating a hybrid automatic repeat request (HARQ) in a wireless mobile communication system using frames consisting of a plurality of subframes for communication in accordance with a frequency division multiplexing (FDD) method,

receiving data burst allocation information transmitted through DL downlink (DL) subframe of frame i and including uplink subframe m of frame j after frame i; Transmitting a data burst through at least one subframe, receiving a feedback on the data burst through frame l downlink subframe of frame k after frame j, and responding to the feedback The method may include transmitting or retransmitting a data burst through at least one subframe including uplink m subframe of frame p.

The fifth method of the present invention; A method for operating a hybrid automatic repeat request (HARQ) in a wireless mobile communication system using frames consisting of a plurality of subframes for communication according to a time division multiplexing (TDD) method,

Data burst allocation information is transmitted through DL downlink (DL) subframe of frame i and data burst through at least one subframe including downlink subframe m of frame i. Transmitting the data, receiving the feedback on the data burst through the n uplink subframe of the j frame after the i frame, and in response to the feedback, the m downlink of the k frame in response to the feedback. And transmitting or retransmitting a data burst through at least one subframe including the subframe.

The fifth method of the present invention; A method for operating a hybrid automatic repeat request (HARQ) in a wireless mobile communication system using frames consisting of a plurality of subframes for communication according to a time division multiplexing (TDD) method,

Data burst allocation information is transmitted through DL downlink (DL) subframe of frame i and data burst through at least one subframe including downlink subframe m of frame i. Transmitting a signal, receiving a feedback on the data burst through frame n, uplink (UL) subframe of frame j, and responding to the feedback, m of frame k And transmitting or retransmitting a data burst through at least one subframe including the first downlink subframe.

Sixth method of the present invention; A method for operating a hybrid automatic repeat request (HARQ) in a wireless mobile communication system using frames consisting of a plurality of subframes for communication according to a time division multiplexing (TDD) method,

transmits data burst allocation information transmitted through DL downlink (DL) subframe of frame i, and through at least one subframe including downlink subframe m of frame i Receiving the transmitted data burst, transmitting the feedback indicating whether the data burst has been successfully received through the n uplink subframe of the j frame after the i frame, and corresponding to the feedback and receiving the burst of data transmitted or retransmitted through at least one subframe including the m downlink subframe of the k frame.

Seventh method of the present invention; A method for operating a hybrid automatic repeat request (HARQ) in a wireless mobile communication system using frames consisting of a plurality of subframes for communication according to a time division multiplexing (TDD) method,

at least one subframe including transmitting data burst assignment information through downlink subframe l of frame i, and uplink subframe m of frame j after frame i Receiving a data burst through the, and after the j frame, the step of transmitting a feedback indicating whether the success of the data burst through the l downlink subframe of the frame k, and the feedback, corresponding to the feedback, and receiving the data burst transmitted or retransmitted through at least one subframe including the uplink subframe m of the p frame.

Eighth method of the present invention; A method for operating a hybrid automatic repeat request (HARQ) in a wireless mobile communication system using frames consisting of a plurality of subframes for communication according to a time division multiplexing (TDD) method,

receiving data burst allocation information transmitted through DL downlink (DL) subframe of frame i and including uplink subframe m of frame j after frame i; Transmitting a data burst through at least one subframe, receiving feedback on the data burst through frame l downlink subframe of frame k after frame j, and responding to the feedback The method includes transmitting or retransmitting a data burst through at least one subframe including uplink m subframe of frame p.

According to the present invention, by flexibly configuring the HARQ operation timing in a wireless mobile communication system, the present invention provides a method for configuring a frame according to system bandwidth, various ratios of downlink (DL) and uplink (UL), and coexistence mode with other systems. Accordingly, HARQ transmission can be flexibly performed. In addition, it may support a synchronized relationship between the DL and the UL.

As described above, the synchronized relationship can reduce the number of subframes that the receiver should monitor, thereby minimizing power waste. In addition, by using the predefined operation timing, there is an advantage that the mobile station has a high degree of freedom for communicating with another system.

Hereinafter, exemplary embodiments of the present invention will be described in detail with reference to the accompanying drawings. In the following description, only parts necessary for understanding the operation of the present invention will be described, and other background art will be omitted so as not to distract from the gist of the present invention.

In this specification, frequency division multiplex (Frequency Division Duplex, hereinafter referred to as 'FDD') mode, or time division multiplex (Time Division Duplex, hereinafter referred to as 'TDD'), or H-FDD (hereinafter referred to as 'H-FDD'). In the wireless mobile communication system to which both the FDD 'mode and the FDD mode and the TDD mode are applied, the present invention proposes a HARQ operation method having a constant HARQ retransmission delay time. The frame structure used in the wireless mobile communication system to which the TDD mode or the H-FDD mode is applied may have various resource occupancy rates between the downlink period and the uplink period. That is, the corresponding relationship between uplink and downlink may have a symmetrical or asymmetrical form.

Hereinafter, an operation of transmitting and receiving a signal between a base station (BS) and a mobile station (MS) in accordance with the HARQ scheme under the super frame structure will be described. Each superframe includes at least one frame, and each frame includes at least one subframe. Hereinafter, a term having the same meaning as the subframe will be described by mixing a time slot. Each time slot or each subframe includes at least one orthogonal frequency division multiple access (OFDMA) symbol.

Each of the base station and the mobile station includes a controller for determining when to perform HARQ transmission according to a frame structure and HARQ operation timing to be described later, and at least for transmitting and receiving data burst allocation information and data burst and HARQ feedback at timing according to the control of the controller. It is configured to include one HARQ processor. As an example, the data burst allocation information may be transmitted in the form of a MAP information element (IE) indicating resource allocation, and the data burst may be transmitted in the form of a HARQ subpacket generated according to an HARQ operation. Can be.

1 is a diagram illustrating an example of a superframe structure of the FDD scheme according to an embodiment of the present invention.

Referring to FIG. 1, the superframe 100 is composed of four frames, and each frame 110 is composed of eight subframes. In the case of the FDD scheme, a downlink (DL) subframe 120 used for transmission from a base station to a mobile station and an uplink (UL) subframe 130 used for transmission from a mobile station to a base station are respectively provided. Operates in different frequency bands.

2 is a diagram illustrating an example of a frame structure of a TDD mode according to a preferred embodiment of the present invention.

Referring to FIG. 2, the superframe 200 is composed of four frames, and each frame 210 is composed of eight subframes. In the TDD mode, a predetermined number of subframes are operated as DL subframes in each frame 210, and the remaining number of subframes are operated as UL subframes. In FIG. 2, DL: UL = 5: 3, which shows five DL subframes within a DL period and three UL subframes within a UL period. A TTG (Transmit / Receive Transition Gap) exists between a DL subframe and a subsequent UL subframe, and a Receive / transmit Transition Gap (RTG) exists between a UL subframe and a subsequent DL subframe.

1 and 2 illustrate and describe a case in which each superframe consists of four frames and each frame consists of eight subframes, the number of frames and the number of subframes are determined by the wireless mobile communication system. It may have different values according to bandwidth and subcarrier spacing. For example, in a wireless mobile communication system of an Orthogonal Frequency Division Multiplexing (OFDM) / OFDMA system having 5, 10, and 20 MHz (hertz) channel bandwidth, the number of subframes per frame may be eight. In case of an OFDM / OFDMA wireless mobile communication system having a channel bandwidth of 8.75 MHz, the number of subframes per frame is 7, and in an OFDM / OFDMA wireless mobile communication system having a channel bandwidth of 7 MHz, The number of subframes per frame may be six.

In the HARQ scheme, a timing of initial transmission and a timing of retransmission may have a predetermined correspondence relationship, and this correspondence relationship is called an HARQ operation timing structure or an HARQ interlace. The HARQ operation timing structure or HARQ interlace may include a relationship between a subframe in which a MAP message indicating resource allocation information (ie, control information) is provided and a subframe in which a signal is transmitted corresponding thereto, and a subframe in which the signal is transmitted. This means a relationship between a subframe in which feedback corresponding thereto is transmitted and a subframe in which the feedback is transmitted and a subframe in which data corresponding thereto is initially transmitted or retransmitted. This will be described below.

(1) Data burst allocation information (Information Element (IE)): Indicates allocation of DL data burst or UL data burst and is provided through a DL subframe.

(2) Data Burst: The transmitting end transmits a data burst using resources allocated according to the data burst allocation information.

(3) HARQ feedback on data burst transmission: The receiver transmits an acknowledgment (ACK) or a negative-acknowledgement (NACK) according to whether the data burst is determined as an error.

(4) Initial Transmission or Retransmission of Data Burst According to HARQ Feedback: When the HARQ feedback is NACK, the transmitter retransmits the data burst. In this case, allocation information for retransmission may be additionally provided. On the other hand, when HARQ feedback is ACK, a new data burst is initially transmitted.

The HARQ scheme may be classified into an asynchronous HARQ and an synchronous HARQ. In the case of asynchronous HARQ, it is necessary to define the HARQ operation timing structure for (1) to (3), and in the case of synchronous HARQ, the definition of the HARQ operation timing structure for (1) to (4) is necessary. In order to define the HARQ operation timing, a constant correspondence between at least one subframe in the DL period and at least one subframe in the UL period is required.

Hereinafter, HARQ operation timing in the FDD communication mode and the TDD communication mode will be described in detail.

3 is a diagram illustrating a HARQ operation timing structure for DL data burst transmission in an FDD scheme according to an embodiment of the present invention. As shown, reference is made to the FDD frame structure of FIG. 1. Here, F = 8, N = 4, and the transmission and reception processing time (Tx / Rx processing time) is assumed to be 3 subframes, respectively, z = 0, u = 0. Herein, the transmission processing time refers to the time required for the transmitter to send the next data after receiving the HARQ feedback, and the reception processing time refers to the time required for transmitting the HARQ feedback after the receiver receives the data.

Referring to FIG. 3, the transmitting end transmits data burst allocation information and DL data burst through DL frequency band in DL subframe 300 of frame i and frame 5 receives a UL subframe 5 of subframe i of frame i. In step 310, HARQ feedback is transmitted through the UL frequency band. Retransmission of the data burst according to the HARQ feedback is performed in the DL subframe 320 of frame i + 1 by the transmitter, and the feedback thereof is performed in DL subframe 330 of frame 5 of the i + 1 frame. Is done.

Referring to Table 1 below, the subframe index n through which HARQ feedback is transmitted is determined to be {ceil (1 + 4) mod 8} = 5, and the frame index j through which HARQ feedback is transmitted. Is determined by {i + floor (ceil (1 + 4) / 8) +0} mod 4 = i, and the frame index k at which the HARQ data burst is retransmitted is {j + floor ((5 + 4) / 8) + 0} Determined by mod 4 = i + 1. The ceil function rounds up the value after the decimal point. The Floor function rounds down the value below the decimal point.

Table 1 below shows an embodiment of a DL HARQ operation timing structure of the FDD scheme.

,

,

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이다.In Table 1, N means the number of frames constituting one superframe, and F means the number of subframes constituting one frame. For example, N = 4 and F = 8 in the 5/10/20 MHz bandwidth. And i, j and k denote DL frame index or UL frame index, l denotes an index of DL subframe where data burst allocation information is provided, and m denotes an index of DL subframe where data burst transmission starts. N means an index of a UL subframe in which HARQ feedback is transmitted for transmission of a data burst. In addition, z means a DL HARQ feedback offset, and u means a DL HARQ Tx offset. Where z and u are in frame units. therefore,

,

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to be.

이다.N _{A - MAP} means a period in subframe units in which data burst allocation information is provided. The data burst assignment information is conveyed in a conventional MAP message or in an advanced MAP message used in an improved system. N _{A - MAP} = 1 when data burst allocation information is provided in every DL subframe, and N _{A - MAP} = 2 when data burst allocation information is provided in two DL subframe intervals. If N _{A - MAP} = 2,

to be.

In the DL HARQ transmission / reception of the FDD scheme shown in FIG. 3, F = 8, N = 4, z = 0, u = 0. DL data burst allocation information provided in DL subframe 300 of frame i indicates frame DL subframe m of frame i. If data burst allocation information is provided for each DL subframe (ie N _A-MAP = 1), the data burst allocation information provided in each DL subframe indicates the starting position of the data burst at which transmission starts in that DL subframe. Instruct. M becomes 'l'. On the other hand, if two DL subframes each being provided with a data burst allocation information (i.e., _{N A-MAP = 2),} l number of data burst allocation information provided from the sub-frame number is l DL sub-frame and the l +1 times the sub Indicates the transmission position of the data burst at which transmission begins in a frame. That is, m indicates one of 'l' and 'l + 1', and the transmitting end informs the value of m through data burst allocation information.

The data burst indicated by the data burst allocation information may be transmitted through one or more subframes, and the length of a transmission time interval (TTI) of the data burst starting transmission in DL subframe m is N _TTI. It is called. Information on N _TTI is indicated by data burst allocation information.

HARQ feedback for the data burst started in DL subframe m of frame i is transmitted in UL subframe n of frame j. N is determined by Equation 1 below by the subframe index m through which the data burst is transmitted.

n = ceil (m + F / 2) mod F

The UL frame index j is determined by the subframe index m and the frame index i through which the data burst is transmitted. In this case, a frame offset is generated by a time interval between when the transmission of the data burst ends and when HARQ feedback is transmitted. Here, the time interval is defined as Gap1 and is defined by Equation 2 below.

Here, N _{DL - Tx} is the length (subframe unit) of the data burst transmission interval according to the DL HARQ operation, and F is the number of subframes constituting each frame. In the FDD system, since each link period is continuous, Gap1 is determined by the DL burst transmission period and the number of subframes in the frame regardless of the subframe index.

In the DL HARQ, the value of the DL HARQ feedback offset z is determined such that Gap1 of Equation 2 is not smaller than (ie, greater than or equal to) the reception processing time. For example, z = 0 if Gap1 is not less than the receive processing time, while z = 1 if Gap 1 is less than the receive processing time. Here, the z value is adjusted such that HARQ feedback is transmitted in the same subframe index of the delayed frame. That is, the z value means an offset in units of frames, and does not mean a change in the subframe index.

When z thus determined is considered, j becomes Equation 3 below.

When retransmitting a DL data burst according to asynchronous HARQ, the retransmission time point of the DL data burst is indicated by a retransmission indicator included in the data burst allocation information. When retransmitting a DL data burst in consideration of synchronous HARQ, the retransmission of the DL data burst is performed in subframe m of frame k. In Table 1, the frame index k is determined by the frame index j and the subframe index n through which HARQ feedback is transmitted. At this time, the frame offset is generated by the time interval between the transmission time of HARQ feedback and the start time of data retransmission. The time interval is defined as Gap2 and is determined as in Equation 4 below.

Here, N _{UL - Tx} is the length of the data burst transmission interval according to the UL HARQ operation, and F is the number of subframes constituting each frame. In the FDD system, since each link interval is continuous, Gap2 is determined by the UL burst transmission interval and the number of subframes in the frame regardless of the subframe index. In general, HARQ feedback has a transmission period of one subframe.

In the DL HARQ, the value of the DL HARQ transmission offset u is determined so that Gap2 of Equation 4 is not smaller than (ie, greater than or equal to) the transmission processing time. For example, u = 0 if Gap2 is not less than the transmission processing time, while u = 1 if Gap 2 is less than the transmission processing time. Here, the u value is adjusted such that the next HARQ data is transmitted in the same subframe index of the delayed frame. That is, the u value means an offset value in units of frames, and does not mean a change in the subframe index.

When u thus determined is considered, k is determined as in Equation 5 below.

As described above, when the time required for processing the transmission signal is not secured, the HARQ retransmission time point may be delayed by one frame (that is, u = 1). In the present specification, the term 'sufficient time' refers to a case where the time required for signal transmission processing (transmission processing time) and the time required for signal reception processing (reception processing time) exceed a known reference value. Here, the reference value is initially set or broadcast by the system.

If the frame index j, k is greater than or equal to the total number N of frames constituting one superframe, the superframe index s is increased by 1, and the frame index j, k is expressed by Equation 3 or 5> has the rest of the modulo operation.

Referring to Equation 2 and Equation 4, the DL HARQ feedback offset z and the DL HARQ transmission offset u in FDD are the length of a transmission interval for HARQ operation (burst or feedback), and the system (transmitter and receiver). It can be determined according to the signal processing ability of the. Information about the signal processing capability is predefined or broadcast by the system. In another embodiment, w and v may be broadcast via system configuration information, depending on the manner of operation in the system.

4 is a diagram illustrating a HARQ operation timing structure for UL data burst transmission in an FDD scheme according to an embodiment of the present invention. Here, F = 8, N = 4 and Tx / Rx processing time are w = 0 and v = 0, assuming 3 subframes, respectively.

Referring to FIG. 4, when data burst assignment information is transmitted through a DL frequency band in DL subframe 400 of frame i, the transmitter transmits a UL frequency band in UL subframe 410 of frame 5 of i frame. Transmit UL data bursts through In DL subframe 420 of the i + 1 frame, the receiver transmits HARQ feedback based on whether an error of the UL data burst is detected through the DL frequency band. When the HARQ feedback in the DL subframe 420 is NACK, retransmission of the data burst is performed by the transmitting terminal through the UL frequency band in UL subframe 430 of frame i + 1. In this case, when burst allocation information indicating UL burst retransmission is transmitted in the DL subframe 420, burst retransmission is performed according to the allocation indication information.

Referring back to the above operation with reference to Table 2, the frame index j through which the UL data burst is transmitted is determined as (i + floor (ceil (1 + 4) / 8) +0) mod 4 = i, The subframe index m on which the UL data burst is transmitted is determined as {ceil (1 + 4) mod 8} = 5. The frame index k for which HARQ feedback is performed is determined as (j + floor ((5 + 4) / 8) +0) mod 4 = i (j = i) +1, and the subframe index for which HARQ feedback is performed is 1 It is determined as a subframe. If HARQ feedback is NACK, the frame index p at which retransmission of the HARQ data burst is performed is determined as (k + floor (ceil (1 + 4) / 8) +0) mod 4 = i + 1, and the subframe index m is Is determined by 5. It is assumed here that allocation information for burst retransmission is not transmitted.

Table 2 below shows an embodiment of the UL HARQ operation timing structure of the FDD scheme.

,

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이다.In Table 2, N means the number of frames constituting one superframe, and F means the number of subframes constituting one frame. I, j, k, and p mean a DL frame index or an UL frame index, l means a DL subframe index for which data burst allocation information is provided, and m indicates an index of a subframe at which data burst transmission starts. Means. In addition, w means UL HARQ feedback offset, and v means UL HARQ transmission offset. Where w and v are in frame units. therefore,

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to be.

이다. In addition, N _A-MAP means a period in which data burst allocation information is provided. When data burst allocation information is provided in every DL subframe, N _A-MAP = 1 and N _A-MAP = 2 when data burst allocation information is provided in two DL subframe intervals. If N _{A - MAP} = 2,

to be.

In the UL HARQ transmission / reception of the FDD scheme, the UL data burst allocation information provided in DL subframe of l (lowercase letter L) of frame i indicates that data burst transmission starts in UL subframe m of frame j. do. When data burst allocation information is provided in every DL subframe (ie, N _A-MAP = 1), the data burst allocation information provided in each DL subframe indicates that data burst transmission starts in n subframes. . That is, m = n. When data burst allocation information is provided for every two DL subframes (ie, N _A-MAP = 2), the data burst allocation information provided in subframe l may be the UL subframe n and the UL subframe n + 1. Indicates the transmission of a data burst in a frame. That is, m is one of n or n + 1, and relevance information indicating this is indicated through data burst allocation information. N is defined as n = ceil (l + F / 2) mod F by DL subframe index l through which data burst allocation information is transmitted.

The data burst indicated by the data burst allocation information may be transmitted through one or more subframes, and information on the length N _TTI of the burst transmission interval is indicated by the data burst allocation information.

HARQ feedback for a data burst started in UL subframe m of frame j is transmitted in DL subframe l (lowercase letter L) in frame k. That is, data burst allocation information and HARQ feedback are transmitted in the same subframe index. Where k is determined by m and j as described in Table 2.

V and w described in Table 2 are UL HARQ transmission offsets and UL HARQ feedback offsets, respectively, and may be calculated using Equations 2 and 4 described above. The UL HARQ transmission offset v is considered for burst transmission or retransmission when data burst allocation information or HARQ feedback is received.

When retransmitting a UL data burst in consideration of asynchronous HARQ, the retransmission time point of the UL data burst is indicated by a transmission position of data burst allocation information and a retransmission indicator included in the data burst allocation information. When retransmitting the UL data burst in consideration of synchronous HARQ, the retransmission of the UL data burst is performed in subframe m of frame p. As described in Table 2, the frame index p is determined by k and l.

The UL HARQ transmission offset v is a time interval in units of frames between when the DL burst allocation information or the DL HARQ feedback is transmitted and when the UL data burst is transmitted. _DL-Tx ) is determined in consideration of Gap1 'calculated by applying the transmission interval of data burst allocation information or the transmission interval of HARQ feedback. In general, the transmission interval of data burst allocation information or HARQ feedback is one subframe.

In UL HARQ, the value of v is adjusted such that Gap1 'calculated as described above is not smaller than the transmission processing time. For example, if Gap1 'is not less than the transmission processing time, v = 0, whereas if Gap1' is less than the transmission processing time, it is v = 1.

The UL HARQ feedback offset w is a time interval in units of frames between the transmission of the UL data burst and the transmission of the DL HARQ feedback. The UL burst is transmitted instead of the data burst transmission interval according to the UL HARQ operation in Equation 4. It is determined in consideration of Gap2 'calculated by applying the interval.

In the UL HARQ, the w value is adjusted such that Gap2 'calculated as described above is not smaller than the reception processing time. For example, w = 0 if Gap2 'is not less than the receive processing time, whereas w = 1 if Gap 2' is less than the receive processing time.

As described above, the UL HARQ transmission offset v and the UL HARQ feedback offset w are determined according to the length of the transmission interval for HARQ operation (burst or feedback) and the processing capability of the system (transmitter and receiver). The processing power is predefined or broadcast by the system. In another embodiment, w and v may be broadcast via system configuration information, depending on the manner of operation in the system. In Table 2, if the frame index j, k, p is greater than or equal to N, the superframe index s is increased by 1, and the frame index j, k, p is the modulo operation of Table 2. Has the remainder.

Each frame in TDD communication mode includes DL subframes and UL subframes. In a preferred embodiment of the present invention, a link having a larger number of subframes is divided based on a link having a smaller number of subframes so that DL subframes and UL subframes have a constant correspondence. Each divided region is composed of one or more subframes and has a correspondence with any one subframe in a link having a smaller number of subframes. That is, M subframes are divided into N regions (M> N), and each subframe has a corresponding relationship according to the present invention. Detailed description of the correspondence will be described later.

5 is a diagram illustrating a DL HARQ operation timing structure of a 5: 3 TDD mode according to an embodiment of the present invention. As shown, reference is made to the TDD frame structure of FIG. 2.

Referring to FIG. 5, the transmitter transmits data burst allocation information and DL data burst in DL subframe 500 of frame i, and the receiver transmits HARQ feedback in UL subframe 510 of frame 0 of frame i. Send. Retransmission of the DL data burst according to the HARQ feedback is performed in DL subframe 520 of frame i + 1 by the transmitter. In this case, data burst allocation information indicating transmission of a DL data burst may be transmitted in the first DL subframe 520. HARQ feedback on this is performed in UL subframe 530 of frame i + 1.

The operation will be described again with reference to Table 3 below.

Table 3 below shows an embodiment of a DL HARQ operation timing structure in TDD mode when DL: UL = D: U. Here, D represents the length of the DL interval (the number of subframes), and U represents the length of the UL interval (the number of subframes).

,

,

,

,

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이다.In Table 3, D denotes the number of DL subframes constituting one DL frame, U denotes the number of UL subframes constituting one UL frame, and N denotes one superframe. Means the number of frames. The number of subframes constituting one frame is F = D + U and i, j and k are frame indexes, l is a subframe index to which data burst allocation information is transmitted, and m is a transmission of data bursts. This means the index of the starting subframe, and n means the subframe index on which HARQ feedback is transmitted. Z denotes a DL HARQ feedback offset and u denotes a DL HARQ transmission offset. therefore,

,

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to be.

이다.In addition, N _A-MAP means a period in which data burst allocation information is provided. When data burst allocation information is provided in every DL subframe, N _A-MAP = 1 and N _A-MAP = 2 when data burst allocation information is provided in two DL subframe intervals. If N _{A - MAP} = 2,

to be.

The parameter K is defined as in Equation 7 or Equation 8 below. That is, K may be K _c or K _f , depending on the system bandwidth, processing interval, and transmission period (N _{A - MAP} ) of data burst allocation information considered by the system. The determination of the K value may vary depending on the system configuration. In general, K _f is used, but K _c can be used when D <U / N _{A - MAP with} F having odd system characteristics.

K _c and K _f have zero or a positive value when D is greater than or equal to U, and a negative value otherwise.

In DL HARQ transmission / reception in the TDD mode, DL data burst allocation information provided in DL subframe of frame i indicates that data burst transmission starts in DL subframe of frame m of frame i. When data burst allocation information is provided in every DL subframe (ie, N _{A - MAP} = 1), the data burst allocation information provided in each DL subframe indicates that data burst transmission is started in the corresponding DL subframe. M becomes l. On the other hand, when data burst allocation information is provided for every two DL subframes (ie, N _{A - MAP} = 2), the data burst allocation information provided in subframe l is the DL subframe l and l + 1. Indicates that transmission of data bursts starts in a subframe. That is, m is one of l or l + 1, and the transmitting end informs the value of m through data burst allocation information.

The data burst indicated by the data burst allocation information may be transmitted through one or more subframes.

HARQ feedback for the data burst started in DL subframe m of frame i is transmitted in UL subframe n of frame j. N may correspond to one or more DL subframe indexes according to the DL and UL ratio (D: U). If D ≦ U, each UL subframe corresponds to one DL subframe. However, if D> U, each UL subframe corresponds to one or more DL subframes. As defined in Table 3, the subframe index n is determined by K and m, and j is determined by i and z.

Here, z denotes a DL HARQ feedback offset as described in the FDD DL HARQ timing structure of Table 1, and is used to adjust the frame index on which the HARQ feedback operation is performed to secure sufficient reception processing time as described above. do. In the TDD system, since the DL subframe and the UL subframe are transmitted in time in one frame, Gap3 calculated as in Equation 9 is used to determine the DL HARQ feedback offset z.

Referring to Equation 9, M _DATA is the number of subframes in which the data burst is transmitted, a is the subframe index at which the data burst starts, N _TTI is the length of the transmission interval of the data burst, and b Is a subframe index on which HARQ feedback is transmitted. Therefore, applying Table 3, M _DATA = D, a = m, and b = n.

In DL HARQ in the TDD mode, the DL HARQ feedback offset z is adjusted so that the Gap3 calculated through Equation 9 is not smaller than the reception processing time. For example, z = 0 if Gap3 is not less than the receive processing time, while z = 1 if Gap3 is less than the receive processing time.

When retransmitting a DL data burst in consideration of asynchronous HARQ, the retransmission of the DL data burst is indicated by a retransmission indicator included in the data burst allocation information. When retransmitting a DL data burst in consideration of synchronous HARQ, the retransmission of the DL data burst is performed in subframe m of frame k. In Table 3, the frame index k is determined by the frame indexes j and u through which HARQ feedback is transmitted. Further, the DL burst retransmission is retransmitted according to the content of the allocation information when burst allocation information indicating retransmission of the DL data burst is transmitted.

Here, u represents a DL HARQ transmission offset as described in the FDD DL HARQ timing structure of Table 1, and is determined according to Gap4 calculated as in Equation 10 below. Gap4 represents the time interval between the transmission time of HARQ feedback and the start time of data retransmission in the TDD mode.

Here, M _CTRL is the number of subframes in which HARQ feedback is transmitted, b is a subframe index in which HARQ feedback is transmitted, and a is a subframe index in which retransmission of the data burst starts after HARQ feedback. Therefore, applying Table 3, M _CTRL = U, b = n, a = m.

In DL HARQ in the TDD mode, the DL HARQ transmission offset u is adjusted so that the Gap4 calculated through Equation 10 is not smaller than the transmission processing time. For example, u = 0 if Gap4 is not less than the transmission processing time, while u = 1 if Gap4 is less than the transmission processing time. If u = 1, since the time required for transmission signal processing is not secured, the HARQ retransmission time point is delayed by one frame.

In Table 3, if the frame indexes j and k are greater than or equal to the total number N of frames constituting one superframe, the superframe index s is increased by 1, and the frame index is modulo in Table 3. It has the remainder of the (modulo) operation.

In another embodiment, the DL HARQ feedback offset z and the DL HARQ transmission offset u are mapping relations between data DL subframes and UL subframes, lengths of HARQ operation (burst or feedback) transmission intervals, and / or signal processing capabilities of the system. It can be determined according to.

6 illustrates a HARQ operation timing structure for UL data burst transmission in the TDD mode according to an embodiment of the present invention.

Referring to FIG. 6, when data burst allocation information is transmitted in DL subframe 600 of frame i, the transmitter transmits UL data burst in UL subframe 610 of frame 0. The receiving end transmits HARQ feedback according to whether the UL data burst is successfully received in DL subframe 620 of frame i + 1. Retransmission of the data burst according to the HARQ feedback is performed in UL subframe 630 of frame i + 1 by the transmitter. When burst allocation information indicating retransmission of a UL data burst is transmitted in DL subframe 620, burst retransmission is performed by the burst allocation information.

The operation will be described again with reference to Table 4 below.

Table 4 below shows an embodiment of the UL HARQ operation timing structure in the TDD mode.

,

,

,

,

,

,

,

이다.In Table 4, D denotes the number of subframes constituting one DL frame, U denotes the number of subframes constituting one UL frame, and K denotes Equation 7 or Math. A parameter defined as in Equation 8>, where N means the number of frames constituting one superframe. I, j, k, and p denote a frame index, l denotes a subframe index in which data burst allocation information is transmitted, and m denotes a subframe index in which data burst transmission starts. In addition, w means UL HARQ feedback offset, and v means UL HARQ transmission offset. therefore,

,

,

,

,

,

,

,

to be.

이다.In addition, N _A-MAP means a period in which data burst allocation information is provided. When data burst allocation information is provided in every DL subframe, N _A-MAP = 1 and N _A-MAP = 2 when data burst allocation information is provided in two DL subframe intervals. If N _{A - MAP} = 2,

to be.

In the UL HARQ transmission / reception in the TDD mode, the UL data burst allocation information provided in DL subframe l of frame i indicates transmission of a data burst starting from UL subframe m of frame j. M may correspond to one or more DL _subsubframes according to a DL and UL ratio (D: U) and an allocation information period N _A-MAP . If ceil (D / N _A-MAP ) ≥U, i.e., the number of DL subframes providing DL control information (data burst allocation information or HARQ feedback) is greater than or equal to the number of UL subframes, Each UL subframe corresponds to one or more DL subframes. However, if ceil (D / N _A-MAP ) <U, that is, the number of DL subframes providing DL control information (data burst allocation information or HARQ feedback) is less than the number of UL subframes, each DL sub The frame corresponds to one or more UL subframes.

In addition, when the number of DL subframes for which data burst allocation information is provided is equal to or greater than the number of UL subframes (ceil (D / N _A-MAP ) ≥ U), data burst transmission in one UL subframe may be performed. It may be indicated in the DL subframe. That is, when l is smaller than K, data burst allocation information in DL subframe l indicates that data burst is transmitted in UL subframe 0, and when l is equal to or larger than K and smaller than U + K. Data burst allocation information in DL subframe of l indicates that data burst is transmitted in subframe (lK). If l is equal to or greater than U + K, data burst allocation information in DL subframe of l is Indicates that data burst is transmitted in subframe U-1.

On the other hand, if the number of DL subframes provided with the data burst allocation information is smaller than the number of UL subframes (ceil (D / N _A-MAP ) <U), one in the DL subframes provided with the data burst allocation information Data burst transmission in the above UL subframe may be indicated. For example, data burst allocation information of DL subframe 0 indicates that data burst is transmitted in UL subframes 0 to (l-K + N _{A - MAP} -1).

When the data burst allocation information is provided only through one DL subframe (ceil (D / N _A-MAP ) = 1), data burst transmission in all UL subframes is indicated in the corresponding DL subframe. The transmission interval (TTI) of the data burst may be indicated through data burst allocation information, and the frame index j is determined by i and v.

V and w described in Table 4 indicate UL HARQ transmission offsets and UL HARQ feedback offsets as described in the FDD UL HARQ timing structure of Table 2, respectively. The UL HARQ transmission offset v is considered to determine a time point for transmission or retransmission of the data burst after receiving data burst allocation information or HARQ feedback, and as described above, transmission of the data burst to ensure sufficient transmission processing time. Used to adjust the frame index on which the operation is performed.

를 데이터 버스트 할당 정보 또는 HARQ 피드백과 같은 제어 정보가 전송되는 DL 서브프레임 개수를 나타내는 D로 정의하고, b를 데이터 버스트 할당 정보 또는 HARQ 피드백이 전송되는 서브프레임 인덱스를 나타내는 l로 정의하고, a를 데이터 버스트가 전송 또는 재전송되는 서브프레임 인덱스를 나타내는 m으로 정의함으로써 계산되는 Gap4'에 따라 결정된다.In UL HARQ in the TDD mode, the UL HARQ transmission offset v is expressed by Equation 10,

Is defined as D representing the number of DL subframes in which control information such as data burst allocation information or HARQ feedback is transmitted, and b is defined as l indicating a subframe index at which data burst allocation information or HARQ feedback is transmitted, and a The data burst is determined according to Gap4 'which is calculated by defining m as the subframe index to be transmitted or retransmitted.

According to a result of comparing the Gap4 'with the transmission processing time required for transmission of the data burst after the HARQ feedback, v = 1 is obtained when the Gap4' is smaller than the transmission processing time, and otherwise v = 0.

In addition, in the UL HARQ mode of the TDD mode, the UL HARQ feedback offset w is a subframe in which M burst is transmitted in M _DATA in Equation 9 to adjust a transmission time of HARQ feedback after reception of a data burst. It is determined according to Gap3 'which is calculated by defining the number U.

According to a result of comparing the Gap3 'with the reception processing time required for transmission of the HARQ feedback after the UL data burst, w = 1 when the Gap3' is smaller than the reception processing time, and w = 0 otherwise.

HARQ feedback for the data burst transmitted in UL subframe m of frame j is performed in DL subframe l of frame k. That is, data burst allocation information and HARQ feedback are transmitted in the same subframe index. Where k is determined by j.

When retransmitting a UL data burst in consideration of asynchronous HARQ, the retransmission time point of the UL data burst is indicated by a retransmission indicator included in data burst allocation information. When retransmitting the UL data burst in consideration of synchronous HARQ, the retransmission of the UL data burst is performed in subframe m of frame p. As described in Table 4, the frame index p is determined by the UL HARQ transmission offset v and the subframe index k through which HARQ feedback is transmitted. If the frame index j, k, p is greater than or equal to N, the superframe index s increases by 1, and the frame index j, k, p has the remaining values by the modulo operation of Table 4.

HARQ  Calculation of Feedback / Transmit Offset

Hereinafter, embodiments for obtaining HARQ feedback offset w, z and HARQ transmission offset v, u will be described.

HARQ feedback offset w, z and HARQ transmission offset v, u are mapping relations between DL subframe and UL subframe, length of transmission interval for HARQ operation (burst or feedback) and / or system (transmitter and / or receiver) It can be determined according to the signal processing performance of. In another embodiment, the feedback offsets may be defined by a constant value and broadcast by the system instead of being obtained by the information. Definition of offsets according to the HARQ operation can be summarized as follows.

The HARQ feedback offset z and the HARQ transmission offset u for the DL HARQ operation according to the FDD mode are calculated by Equation 11 below.

Here, Rx_Time1 represents the reception processing time for the data burst, which is determined by the capability of the receiver, and Tx_Time1 represents the transmission processing time of the data burst, which is determined by the performance of the transmitter. Here, the reception processing of the data burst includes multiple input multiple output (MIMO) reception processing (Rx processing), demodulation, decoding, and the like. The transmission processing of the data burst includes encoding, modulation, MIMO transmission processing, and the like. Since DL HARQ, the receiving end is mainly a terminal and the transmitting end considers a base station. In addition, the HARQ feedback transmission interval has considered 1 subframe, and the burst transmission interval is N _TTI .

The HARQ feedback offset v and the HARQ transmission offset w for the UL HARQ operation according to the FDD mode are calculated by Equation 12 below.

Here, Rx_Time2 represents the reception processing time for the data burst, which is determined by the capability of the receiver, and Tx_Time2 represents the transmission processing time of the data burst, which is determined by the performance of the transmitter. However, since UL HARQ, the receiving end means the base station and the transmitting end means the terminal.

The HARQ feedback offset z and the HARQ transmission offset u for the DL HARQ operation according to the TDD mode are calculated by Equation 13 below.

Here, Rx_Time3 and Tx_Time3 represent a reception processing time and a transmission processing time.

The HARQ transmission offset v and the HARQ feedback offset w for the UL HARQ operation according to the TDD mode are calculated by Equation 14 below.

Here, Rx_Time4 and Tx_Time4 represent a reception processing time and a transmission processing time.

In consideration of synchronous HARQ, the transmission processing time in UL HARQ operation may be considered differently according to initial transmission or retransmission. That is, in Equations 12 and 14, Tx_Time2 and Tx_Time4 may be replaced with Tx_Time_NewTx and Tx_Time_ReTx depending on whether the transmission is initially performed. Here, Tx_Time_NewTx means transmission processing time for initial transmission and Tx_Time_ReTx means transmission processing time for retransmission. As described above, the initial transmission should encode the burst according to the burst allocation information, but the encoding in the retransmission indicated by NACK may be performed by recycling the burst previously encoded in the initial transmission. Therefore, the HARQ transmission offset is adjusted by considering the transmission processing time required for initial transmission and retransmission differently.

In addition, according to a retransmission triggering method, a transmission processing time for retransmission may be divided into Tx_Time_ReTx1 and Tx_Time_ReTx2. As a retransmission triggering method, only NACK is indicated or allocation information for NACK and retransmission may be transmitted. Tx_Time_ReTx1 means transmission processing time for retransmission triggered by NACK only, and Tx_Time_ReTx2 means transmission processing time for retransmission triggered by allocation information for retransmission.

와

로 구분되어 조정될 수 있다. 여기서

는 Tx_Time_NewTx의 송신 처리 시간을 고려한 버스트의 초기 전송을 위한 UL HARQ 전송 오프셋이고,

는 Tx_Time_ReTx의 송신 처리 시간을 고려한 버스트의 재전송을 위한 UL HARQ 전송 오프셋이다.Similarly, HARQ transmission offsets in <Table 2>, <Table 4>, <Equation 12>, and <Equation 14> take into consideration the transmission processing time according to initial transmission or retransmission, respectively.

Wow

Can be adjusted. here

Is the UL HARQ transmission offset for the initial transmission of the burst taking into account the transmission processing time of Tx_Time_NewTx,

Is a UL HARQ transmission offset for retransmission of the burst in consideration of the transmission processing time of Tx_Time_ReTx.

coexistence mode

The Institute of Electrical and Electronics Engineers (IEEE) 802.16m wireless mobile communication system may coexist with the IEEE 802.16e wireless mobile communication system with a predetermined frame offset within a superframe structure. That is, each frame of the 16m mode includes a frame offset to compensate for the difference with respect to the frame of the 16e mode together with the DL subframes and the UL subframes. In this case, the HARQ operation timing structure of the TDD mode follows the HARQ operation timing structures of Tables 3 and 4 corresponding to the DL and UL ratios in the interval in which the network node and the terminal operate in the IEEE 802.16m mode.

The mapping relationship between the DL subframe and the UL subframe is determined according to the DL / UL ratio in the interval in which the network node and the terminal operate in the IEEE 802.16m mode. That is, the subframe index and the number of transmission intervals for HARQ operation are determined according to the DL / UL ratio. However, the frame index is determined based on the total DL / UL ratio in the TDD system, not the DL / UL ratio in the section operating in the 16m mode.

Here, the number of subframes of each link period in the 16m mode is referred to as D 'and U', and the index of the subframe according to D ': U', which is the DL / UL ratio in the section operating in the 16m mode, is denoted by l 'and m. It is called ', n'. HARQ operation timing in the 16m mode, except for the legacy section operating in the 16e mode using the sub-frame index aligned in D ': U' using the <Table 3> and <Table 4 Has a timing structure defined in However, the frame indices i, j, and k, which are determined according to the HARQ feedback offset z or w and the HARQ transmission offset u or v, use the subframe index within D: U.

7 is a diagram illustrating a HARQ operation timing structure according to DL data burst transmission in a 5: 3 TDD mode in a mode where two systems coexist according to an embodiment of the present invention. As shown in FIG. 7, two DL subframes and a UL FDM region are used for the legacy mode, and subframe indexes are rearranged in a section other than the section used in the legacy mode. That is, the DL frame is composed of DL subframes 0 to 4, wherein DL subframes 2 to 4 have rearranged DL subframe indexes 0, 1, and 2, respectively. Therefore, the frame operating in the 16m mode consists of three DL subframes and three UL subframes.

Referring to FIG. 7, since D '= 3 and U' = 3, K = 0. In transmission of TDD DL HARQ data burst in coexistence mode, data burst allocation information and data burst are transmitted in DL subframe 0 of frame i, and HARQ feedback is transmitted in UL subframe 0 of frame i. do. Retransmission of the HARQ data burst is performed in DL subframe 0 of frame i + 1. Feedback on this is performed in DL subframe 0 of frame i + 1. In this case, the transmission / reception processing time was considered as 2 subframes, respectively.

8 is a diagram illustrating a HARQ operation timing structure according to UL data burst transmission in a TDD mode in a mode where two systems coexist according to an embodiment of the present invention.

Referring to FIG. 8, since D ′ = 3 and U ′ = 3 according to the same frame structure as that of FIG. 7, K = 0. In the transmission of the TDD UL HARQ data burst in the coexistence mode, data burst allocation information is transmitted in DL subframe 0 of frame i, and transmission of UL data burst for this transmission is performed in UL subframe 0 of frame i. Is performed. HARQ feedback is performed in DL subframe 0 of frame i + 1, and retransmission of the HARQ data burst is performed in UL subframe 0 of frame i + 1. In this case, data burst allocation information indicating transmission of a UL data burst may be transmitted in the DL subframe. In this case, the transmission / reception processing time was considered as 2 subframes, respectively.

Meanwhile, resources used in the IEEE 802.16e wireless mobile communication system exist in the frame offset period shown in FIGS. 7 and 8.

Long transmission interval ( long TTI )

The HARQ operation timing structure proposed in Tables 1 to 4 is determined according to the subframe index at which data burst transmission starts regardless of the length of the data burst transmission interval. Therefore, when synchronous HARQ is used, HARQ feedback is periodically transmitted only in a specific subframe, so that a receiving end can save power for monitoring reception of HARQ feedback and efficiently support co-located coexistence (CLC).

However, as another embodiment of the present invention, when the data burst is transmitted over two or more subframes, that is, in the HARQ timing according to a long TTI, the above-described Tables 1 to 4 described above In order to support faster ACK timing than the HARQ timing structure, the HARQ feedback timing may be determined according to the subframe index where the data burst ends, instead of the subframe index where the data burst starts. This determination method may be used for fast ACK timing mainly in the asynchronous HARQ method.

In Table 1, the timing of the HARQ feedback is adjusted as follows. That is, indexes of UL subframes and frames in which HARQ feedback is transmitted according to m '(= m + N _TTI- 1), which is the last subframe index of the data burst transmission interval, instead of m, the first subframe index of the data burst transmission interval, Is determined.

9 is a diagram illustrating a HARQ operation timing structure for DL data burst transmission in an FDD scheme according to another embodiment of the present invention. Here, N _TTI = 4, F = 8, N _{A -MAP} = 1, and the transmission and reception processing time is assumed to be 3 subframes or less, respectively, DL HARQ feedback offset z and DL HARQ transmission offset u is each 0.

Referring to FIG. 9, the data burst allocation information provided in DL subframe 1 of frame i may include DL data bursts in a burst transmission interval 900 from DL subframe 1 to DL subframe 4 of frame i. Indicates that is transmitted. HARQ feedback for the DL data burst is UL subframe 910 of frame (i + 1) corresponding to DL subframe 4 of frame i according to the subframe index where the transmission of the data burst ends. Is sent from. That is, n = 0 (= ceil (1 + 4-1 + 4) mod 8) and j = i + 1 (= (i + floor (ceil (1 + 4-1 + 4) / 8) mod 4) ))to be. In the case of synchronous HARQ, the data burst transmission 920 after HARQ feedback starts in DL subframe 0 of frame i + 2, which is the same subframe position as before.

As described above, in determining the HARQ feedback timing in Tables 1 to 2, instead of the subframe index m at which transmission of the data burst starts, the last subframe of at least one subframe in which the data burst is transmitted. HARQ feedback timing may be determined using m ', which is an index of.

Similarly in the DL HARQ operation timing structure of the TDD mode, for faster ACK timing, instead of m, which is a subframe index at which data burst transmission starts, m '(= m + N _TTI , which is a subframe index at which data burst transmission ends). _- 1) for the HARQ feedback it may be determined by applying a timing in <Table 3> mentioned above.

FIG. 10 illustrates a HARQ operation timing structure for DL data burst transmission in a TDD mode according to another embodiment of the present invention. Here, N _TTI = 4, D = 4, U = 4, the transmission and reception processing time is 3 subframes, respectively, K = 0, z = 0.

Referring to FIG. 10, data burst allocation information provided in DL subframe 1 of frame i may include DL data bursts in a burst transmission interval 1000 from DL subframe 0 to DL subframe 3 of frame i. Indicates that is transmitted. HARQ feedback for the DL data burst is transmitted in UL subframe 1010 of frame i corresponding to DL subframe 3 of frame i, according to Table 3. That is, n = 3 (= 3-0) and j = i (= (i + 0) mod 4). In the case of synchronous HARQ, the data burst transmission 1020 after the HARQ feedback is started in DL subframe 0 of frame i + 2, which is the same subframe position as before.

However, in a HARQ timing structure for long TTI transmission in a TDD system, a method of providing fast HARQ feedback timing according to a DL: UL ratio and transmission / reception processing time is different. As an example, HARQ feedback timing for a long TTI (5 subframes) for DL HARQ in a 5: 3 TDD mode will be described when a transmission / reception process time is 3 subframes and a TTI is an entire period of a corresponding link.

When the HARQ feedback timing is provided according to the transmission start time of the data burst, the HARQ feedback is provided in the UL subframe 0 of the next frame corresponding to the DL subframe 0 where the transmission of the data burst starts. On the other hand, when the HARQ feedback timing is provided according to the transmission end time of the data burst, the HAQR feedback is provided in the UL subframe 3 of the next frame corresponding to the DL subframe 4 where the transmission of the data burst ends. As such, when a long TTI is used in a DL HARQ in a 5: 3 TDD mode, using a data burst transmission start time provides faster HARQ feedback timing for a longer TTI than using a data burst transmission end time. .

As another example, feedback timing for a long TTI (4 subframes) for DL HARQ in the 4: 4 TDD mode is described.

When the HARQ feedback timing is provided according to the transmission start time of the data burst, the HARQ feedback is provided in the UL subframe 0 of the next frame corresponding to the DL subframe 0 where the transmission of the data burst starts. On the other hand, when the HARQ feedback timing is provided according to the transmission end point of the data burst, the HARQ feedback is provided in the UL subframe 3 of the same frame corresponding to the DL subframe 4 where the transmission of the data burst ends. As such, in the 4: 4 DL mode HARQ, unlike in the 5: 3 DL mode, using a data burst transmission end point provides fast HARQ feedback timing for a TTI longer than using a data burst transmission start point. do.

Therefore, in the embodiment of the present invention, the appropriate HARQ operation timing structure is selected according to the DL / UL ratio and the transmission / reception processing time. Specifically, in determining the HARQ feedback timing in Tables 1 to 4, instead of the subframe index m at which the data burst starts, the index of the last subframe among the at least one subframe in which the data burst is transmitted. m '(= m + N _TTI- 1) may be used. The information on the HARQ operation timing structure may be provided through, for example, a DL common control channel as system information.

HARQ  Change in Feedback / Transmit Offset

Hereinafter, other embodiments of the DL and UL HARQ operation timing structure of the TDD mode proposed by the present invention will be described. In detail, changes in the HARQ feedback offset and the HARQ transmission offset according to the subframe position where DL or UL transmission is performed will be described.

11A and 11B show a HARQ operation timing structure for N _{A - MAP} = 1 when D + U = 8.

FIG. 11A illustrates a HARQ operation timing structure when D: U = 5: 3 and a burst transmission interval is 1 subframe. Referring to FIG. 11A, when the transmission / reception processing time is 2 subframes, HARQ feedback / transmission offset = 0. That is, since processing for transmission of each DL subframe can be completed in two subframes (that is, since Gap3 and Gap4 are greater than 2), corresponding UL transmissions are made without delay in subsequent UL intervals. Similarly, since the processing for transmission of each UL subframe is completed in two subframes (that is, since Gap3 and Gap4 are greater than 2), corresponding DL transmission is performed without delay in the subsequent DL period.

On the other hand, when the transmission and reception processing time is three subframes, respectively, the HARQ UL transmission timing associated with the fourth DL subframe is delayed by one frame period. It takes 3 subframes to process the transmission of DL subframe 4, but it is difficult to perform UL transmission in 2 subframes (= 5-4-1 + 2), which is an interval to the corresponding UL 2 subframe. Because. Accordingly, the UL transmission in the second UL subframe corresponding to the fourth DL subframe is delayed by one frame, that is, the next i + 1 frame.

FIG. 11B illustrates a HARQ operation timing structure for a case where D: U = 3: 5 and a burst transmission interval is 1 subframe. Referring to FIG. 11B, when the transmission / reception processing time is 2 subframes, HARQ feedback / transmission offset = 0. On the other hand, when the transmission and reception processing time is 3 subframes, respectively, since Gap = 3-0-1-0 = 2, the UL transmission timing in the UL subframe 0 associated with the DL subframe 0 is delayed by one frame period. Since, Gap = 5-4-1 + 2 = 2, the DL transmission timing in DL subframe 2 associated with UL subframe 4 is delayed by one frame period. This is because each gap is not greater than the send or receive processing time.

12A and 12B show the HARQ operation timing structure for D + U = 7.

12A illustrates a HARQ operation timing structure when D: U = 4: 3 and N _A-MAP = 1 and a burst transmission interval is 1 subframe. Referring to FIG. 12A, when the transmission / reception processing time is 2 subframes, HARQ feedback / transmission offset = 0. On the other hand, when the transmission and reception processing time is 3 subframes, respectively, since Gap = 4-3-1 + 2 = 2, the HARQ UL transmission timing in the UL subframe 2 associated with the DL subframe 3 is delayed by one frame period. do.

FIG. 12B illustrates a HARQ operation timing structure for a case where D: U = 3: 4, N _{A - MAP} = 1, and a burst transmission interval is 1 subframe. In this case, K _c (= -1) was used because D + U is odd and D <U. Referring to FIG. 12B, since N _{A - MAP} = 2, DL control information is transmitted in DL subframes 0 and 2. If the transmission / reception processing time is 2 subframes, respectively, HARQ feedback / transmission offset = 0. On the other hand, if the transmission and reception processing time is 3 subframes, respectively, HARQ UL transmission timing is delayed by one frame period in UL subframe 0 associated with DL subframe 0.

13A and 13A show a HARQ operation timing structure for N _{A - MAP} = 1 when D + U = 6.

FIG. 13A illustrates a HARQ operation timing structure for a case where D: U = 4: 2 and a burst transmission interval is 1 subframe. Referring to FIG. 13A, when the transmission / reception processing time is 2 subframes, the HARQ UL transmission timing associated with DL subframe 3 is delayed by one frame period. In addition, when the transmission and reception processing time is three subframes, respectively, HARQ DL transmission timing associated with UL subframe 0 is delayed by one frame period, and HARQ UL and DL after associated with DL subframes 1 and 2 Each transmission timing is delayed by one frame period. In addition, HARQ UL transmission timing associated with DL subframe 3 is delayed by one frame period.

FIG. 13B illustrates a HARQ operation timing structure for D: U = 3: 3 and a burst transmission interval for one subframe. Referring to FIG. 13B, when the transmission / reception processing time is 2 subframes, HARQ feedback / transmission offset = 0. When the transmission / reception processing time is 3 subframes, respectively, the HARQ feedback / transmission offsets are all delayed by 1, that is, by one frame period.

Relay structure

Hereinafter, a HARQ operation timing structure in a wireless mobile communication system supporting a relay structure according to a preferred embodiment of the present invention will be described.

When supporting the relay structure, the base station and the mobile station communicate directly or through at least one relay station (RS), and the relays between the base station and the mobile station are odd-hop RS or even-hop. It is classified as a relay station (Even-Hop RS). Each relay station includes a controller for determining when to perform HARQ transmission according to a frame structure and HARQ operation timing to be described later, and at least one of transmitting and receiving data burst allocation information, data burst, and HARQ feedback at timing according to the control of the controller. It is configured to include a transceiver.

In the present specification, an HARQ operation timing structure of a section in which a relay station and a mobile station operate in a 16m mode will be described.

14 illustrates a frame structure of a wireless mobile communication system supporting a relay structure according to a preferred embodiment of the present invention.

Referring to FIG. 14, a frame 1410 of a base station includes a DL access area 1412 transmitted directly from a base station to a mobile station, a DL transmission area 1414 transmitted from a base station to a mobile station or a relay station, and a network coded reception area (Network). Coding Receive Zone 1416, UL access area 1418 received from a mobile station, and UL reception area 1420 received from a mobile station or relay station. A gap (Gap) 1422 exists between the transmission areas 412 and 1414 and the reception areas 1416, 1418 and 1420 for switching between transmission and reception.

The frame 1420 of an odd-hop relay station includes a DL access area 1432 transmitted to a mobile station, a DL transmission area 1434 transmitted to a mobile station or an even-hop relay station, and a DL reception area received from an even-hop relay station or a base station. 1444, a network coded transmission region 1438, a UL reception region 1440 received from a mobile station or even-hop relay station, and an UL transmission region 1442 transmitted to an even-hop relay station or base station. There is an interval 1444, 1446, and 1448 for transmission / reception switching between the transmission areas 1432, 1434, 1438, and 1442 and the reception areas 1434 and 1440.

Frame 1450 of an even-hop relay station includes a DL access area 1452 transmitted to the mobile station, a DL reception area 1454 received from an odd-hop relay station, and an DL transmission area 1456 transmitted to an odd-hop relay station or mobile station. And a network coded reception area 1458, an UL transmission area 1460 transmitted to an odd-hop relay station, and an UL reception area 1462 received from a mobile station or odd-hop relay station. There is an interval 1464, 1466, 1468, and 1470 for transmitting / receiving switching between the transmission areas 1452, 1456, and 1460 and the reception areas 1454, 1458, and 1462.

As described above, in the region in which at least one relay station communicates with the mobile station, the HARQ operation timing structure has a subframe index according to the mapping relationship between the DL subframe and the UL subframe, similar to the HARQ operation in the coexistence mode described above. The frame index is determined according to the DL: UL ratio in the frame of the frame, and the frame index is determined according to the subframe index determined based on the DL: UL ratio.

15A and 15B illustrate an example of a RS frame structure in a TDD mode according to an embodiment of the present invention. Here, the TDD frame structure with D: U = 4: 4 is shown, and the network coded transmission / reception area is omitted.

Referring to FIG. 15A, DL subframes 0 to 2 in frame i used by an odd-hop relay station are used for DL transmission, that is, for transmission from a relay station to a mobile station or a lower relay station, and the other DL subframe is used. DL reception, i.e. reception from a base station. In addition, UL subframes 0 and 1 are used for UL reception, i.e., reception from a mobile station, and the remaining two UL subframes are used for UL transmission, i.e., transmission to an upper relay station or a base station.

Referring to FIG. 15B, in the frame i used by the even-hop relay station, the subframes 0 and 1 positioned at the beginning of the DL interval are used for DL transmission, that is, for transmission from the relay station to the mobile station. Two DL subframes located at are used for DL reception, i.e., reception from an upper odd-hop relay station. In addition, UL subframes 0 and 1 located at the end of the UL interval are used for UL reception, i.e., reception from a mobile station, and two UL subframes located in front are used for UL transmission, that is, transmission to an upper odd-hop relay station. do.

16A and 16B illustrate an HARQ operation timing structure for an odd-hop relay station according to an embodiment of the present invention. Where D: U = 3: 2.

FIG. 16A illustrates a HARQ operation timing structure in consideration of K _f . As illustrated, HARQ UL transmission timing corresponding to DL subframe 2 is delayed by one frame period. FIG. 16B illustrates a HARQ operation timing structure considering K _c . As illustrated, HARQ UL transmission timing corresponding to DL subframes 1 and 2 is delayed by one frame period.

17 illustrates an HARQ operation timing structure for an even-hop relay station according to an embodiment of the present invention. Where D: U = 2: 2. As illustrated, the HARQ DL transmission timing corresponding to the UL subframe 0 is delayed by one frame period.

As described above, a value of K that can provide faster HARQ timing needs to be selected according to the DL / UL ratio and the transmission / reception processing time. The system operator can select an appropriate HARQ operation timing structure and a value of K according to system configuration information such as a DL / UL ratio and a transmission / reception processing time that the system operates. The system configuration information is provided through a DL common control channel. .

Long transmission interval ( long TTI For) HARQ  Timing structure

In the following, HARQ timing structure according to allocation information for long TTI transmission will be described with reference to Tables 3 and 4.

In DL HARQ, when allocation information indicating transmission of a data burst having a long TTI is transmitted in a certain DL subframe, if the long TTI transmission indicated by the allocation information is not possible in the same frame as the allocation information, the data burst is The first DL subframe of the next frame is transmitted, and feedback thereto is transmitted in an UL subframe corresponding to the DL subframe of a subsequent frame. And if the long TTI transmission indicated by the allocation information provided in a certain DL subframe in UL HARQ is not possible in the same frame, the data burst is transmitted in the first UL subframe of the next frame, and the feedback for this is determined by It is transmitted in a DL subframe having the same index as the DL subframe. Detailed description thereof is as follows.

For DL HARQ, referring to <Table 3>, allocation information transmitted in DL subframe l (lowercase L) of frame i is N _{A - MAP.} According to the burst transmission in DL subframe m. However, in the case of long TTI transmission, the transmission start position of the data burst is determined by the DL subframe index m and the transmission interval N _TTI . Therefore, the long TTI transmission starts in DL subframe h of frame a and the corresponding HARQ feedback is transmitted in UL subframe f of frame b. If the UL HARQ feedback is NACK, retransmission is performed in DL subframe h or subsequent DL subframes of frame c. Here, frame indexes a, b, c and subframe indexes h, f are indexes i, l and m obtained from allocation information, corresponding UL subframe index n, and transmission interval N _TTI . Is determined as follows.

That is, the long TTI transmission indicated by the allocation information starts at subframe m of frame i when Dm≥N _TTI , so a = i and h = m. On the other hand, if the Dm <N _TTI, long TTI transmission from 0 sub-frame of m times DL sub because the remaining period of the subsequent frame may be a burst of N _TTI length of transport is smaller than N _TTI next frame (i + 1) is Since a = i + 1 and h = 0.

In order that the UL HARQ feedback is not driven in a specific UL subframe, the UL HARQ feedback for the transmitted burst is transmitted in the next frame, so b = a + 1 (= i + 2). The UL subframe index f through which UL HARQ feedback is transmitted is determined by the DL subframe index l through which allocation information is transmitted. Here, the relationship between l and f follows the relationship between m and n defined in <Table 3>.

번 프레임의 2번 DL 서브프레임에서 전송되는 할당 정보에 대한 버스트 전송은, 5(=D) - 2(=m) < 5(=N_TTI)이므로, i+1 (=a)번 프레임의 0 (=h)번 DL 서브프레임에서 시작되고, 이에 대한 UL HARQ 피드백은 i+2 (=b)번 프레임의 l (=n)번 UL 서브프레임에서 전송된다. For example, if N _TTI = 5, N _{A - MAP} = 1 and Tx / Rx Processing time = 3 in a 5: 3 TDD structure,

The burst transmission for the allocation information transmitted in DL subframe 2 of frame 1 is 5 (= D)-2 (= m) <5 (= N _TTI ), so 0 in frame i + 1 (= a) Starting at DL subframe (= h), UL HARQ feedback is transmitted in UL subframe l (= n) of frame i + 2 (= b).

) 및 이에 대응되는 UL 프레임 및 서브프레임 인덱스 (

), 전송 구간(N_TTI)에 의해 다음과 같이 결정된다. For UL HARQ, referring to Table 4, allocation information transmitted in DL subframe l of frame i is performed in UL subframe m of frame j according to N _{A - MAP} and DL subframe index l. Indicate the starting burst transmission. In the case of long TTI transmission, the transmission start position of the data burst is determined by the UL subframe index m and the transmission interval N _TTI . Therefore, the long TTI transmission starts at UL subframe h of frame a and the corresponding HARQ feedback is transmitted at DL subframe f of frame b. If the DL HARQ feedback is NACK, retransmission is performed in UL subframe h of frame c. Where frame index a, b, c and subframe index h, f are indexes indicated by allocation information (

) And corresponding UL frame and subframe indexes (

), Is determined as follows by the transmission interval (N _TTI ).

That is, when j = i, the long TTI transmission indicated in the allocation information starts at subframe m of frame j when Um ≥ N _TTI , so a = i and h = m, whereas Um <N _TTI case, since the m times UL sub remaining interval after frame N smaller than the _TTI N _TTI length of the burst is not be transmitted the next frame (i + 1) of # 0 UL subframe long TTI transfer is started on, a = i +1 and h = 0. If j = i + 1, since long TTI transmission starts at UL subframe 0 of frame i + 1, a = i + 1 and h = 0. The DL HARQ feedback is provided at DL DL subframe index, so f = l. Referring to Equation 14, if UhN _TTI + l ≥ Rx_Time4, DL HARQ feedback is provided at frame b = a + 1. If UhN _TTI + l <Rx_Time4, DL HARQ feedback is provided at frame b = a + 2. Is provided. If the DL HARQ feedback is NACK, the retransmission begins at UL subframe h in frame c, where similar to calculating frame index a, c = b if a = i, c for a = i + 1. = b + 1.

For example, in a 5: 3 TDD structure, when N _TTI = 3, N _{A - MAP} = 1, and Tx / Rx Processing time = 3, it is transmitted in DL subframe 2 of frame i. The UL burst transmission for the allocation information starts at UL subframe 0 (= h) of frame i + 1 (= a), since 3 (= U)-1 (= m) <3 (= N _TTI ). DL HARQ feedback for this is 3 (= U)-0 (= h)-3 (= N _TTI ) + 2 (= l) <3 (= Rx_Time), so frame i + 2 (= b) Is transmitted in 2 (= f) times of UL subframe. If DL HARQ feedback is NACK, retransmission is transmitted in UL subframe 0 of frame i + 3 (= b + 1) as calculated as a = i + 1.

18 and 19 show an operation flowchart between a base station and a terminal for a DL and UL HARQ timing structure according to a preferred embodiment of the present invention, respectively.

Referring to FIG. 18, in step 1802, system configuration information is transmitted from the base station BS to the terminal MS. The system configuration information is broadcast from the base station or obtained through negotiation between the base station and the terminal to enable system access of the terminal. Specifically, the system configuration information is information required for operating the HARQ timing structure, and includes bandwidth (total number of subframes), number of subframes (D and U) of each link, transmission / reception processing time of a base station, transmission / reception processing time of a terminal, and the like. It includes.

After the terminal acquires the system information through the system configuration information and accesses the base station, in step 1804, the base station and the terminal may perform data communication.

In step 1806, allocation information including or indicating a frame index, a subframe index, a long TTI length, and MAP relevance for the HARQ operation timing is transmitted from the base station to the terminal. (DL subframe 1 of frame i) The UE decodes the allocation information to extract necessary information, and in particular, the frame index and subframe index on which each HAQR operation is performed by the frame index and subframe index on which the previous HARQ operation is performed according to the method defined in the present invention. Decide

In step 1808, the base station transmits a DL HARQ burst in subframe h of frame a according to the allocation information, and the terminal decodes the DL HARQ burst according to the allocation information. In step 1810, the HARQ feedback based on the decoding result is transmitted to the base station in subframe f of frame b.

Subsequently, in step 1812, the next allocation information may be transmitted in subframe h of frame c, which is a designated period. In addition, when the HARQ feedback is detected as NACK, the DL HARQ burst may be retransmitted in step 1814.

19, the system configuration information is transmitted from the base station BS to the terminal MS in step 1902. After the UE acquires the system information through the system configuration information and accesses the base station, in step 1904, the base station and the terminal may perform data communication.

In step 1906, allocation information including or indicating a frame index, a subframe index, a long TTI length, and MAP related information (relevance) for HARQ operation timing is transmitted from the base station to the terminal. (DL subframe 1 of frame i) The UE decodes the allocation information to extract necessary information, and in particular, the frame index and subframe index on which each HAQR operation is performed by the frame index and subframe index on which the previous HARQ operation is performed according to the method defined in the present invention. Decide

In step 1908, the UE transmits a UL HARQ burst in subframe h of frame a according to the allocation information, and the base station decodes the UL HARQ burst according to the allocation information. In step 1910, HARQ feedback or next allocation information according to the decoding result is transmitted to the terminal in subframe f of frame b. When the HARQ feedback is detected as NACK, in step 1912, the DL HARQ burst may be retransmitted in subframe h of frame c, which is a designated period.

Meanwhile, in the detailed 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 limited to the described embodiments, but should be determined not only by the scope of the following claims, but also by the equivalents of the claims.

1 is a diagram illustrating an example of a superframe structure of the FDD scheme according to an embodiment of the present invention.

2 is a diagram illustrating an example of a superframe structure in a TDD mode according to a preferred embodiment of the present invention.

3 is a diagram illustrating a HARQ operation timing structure for DL data burst transmission in an FDD scheme according to an embodiment of the present invention.

4 is a diagram illustrating a HARQ operation timing structure for UL data burst transmission in an FDD scheme according to an embodiment of the present invention.

5 is a diagram illustrating a HARQ operation timing structure for DL data burst transmission in a TDD mode according to an embodiment of the present invention.

6 illustrates a HARQ operation timing structure for UL data burst transmission in the TDD mode according to an embodiment of the present invention.

7 is a diagram illustrating a HARQ operation timing structure according to a DL data burst transmission in a TDD mode in a mode where two systems coexist according to an embodiment of the present invention.

8 illustrates a HARQ operation timing structure according to UL data burst transmission in TDD mode in a mode in which two systems coexist according to an embodiment of the present invention.

9 illustrates a HARQ operation timing structure for DL data burst transmission in an FDD scheme according to another embodiment of the present invention.

10 illustrates a HARQ operation timing structure for DL data burst transmission in the TDD mode according to another embodiment of the present invention.

11A and 11B, 12A and 12B, and 13A and 13B illustrate a HARQ operation timing structure according to ratios of DL and UL.

14 illustrates a frame structure of a wireless mobile communication system supporting a repeater according to a preferred embodiment of the present invention.

15A and 15B illustrate an example of a RS frame structure in a TDD mode according to an embodiment of the present invention.

16A and 16B illustrate an HARQ operation timing structure for an odd-hop relay station in accordance with an embodiment of the present invention.

17 illustrates a HARQ operation timing structure for an even-hop relay station according to an embodiment of the present invention.

18 and 19 show an operation flowchart between a base station and a terminal for a DL and UL HARQ timing structure according to a preferred embodiment of the present invention, respectively.

Claims (20)

A method for operating a hybrid automatic repeat request (HARQ) in a wireless mobile communication system using frames consisting of a plurality of subframes for communication in accordance with a frequency division multiplexing (FDD) method, Data burst allocation information is transmitted through DL downlink (DL) subframe of frame i and data burst through at least one subframe including downlink subframe m of frame i. Sending a message, Receiving the feedback on the data burst through the n uplink subframe of the j frame after the i frame; In response to the feedback, transmitting or retransmitting a data burst through at least one subframe including the m downlink subframe of the k frame. Each frame and subframe is HARQ operation method characterized in that each index is determined by the following table.

In the table, N is the number of frames constituting the superframe, F is the number of subframes constituting each frame, i, j and k is the frame index, l is the subframe index provided with the data burst allocation information M is a subframe index at which the transmission of the data burst starts, n is a subframe index at which the feedback is transmitted, z is a downlink HARQ feedback offset, u is a downlink HARQ transmission offset, and N _{A - MAP} means a period in which the data burst allocation information is provided, and when the data burst allocation information is provided in every downlink subframe, N _{A - MAP} = 1 and the data at two downlink subframe intervals. When burst allocation information is provided, N _{A - MAP} = 2, and N _{A - MAP} = 2

being. The method of claim 1, U is determined as 1 when the HARQ transmission processing time exceeds the first reference time interval, and is determined as 0 when the first reference time interval is not exceeded, and z is the second HARQ reception processing time. When the reference time interval is exceeded, it is determined as 1, and when the second reference time interval is not exceeded, it is determined as 0, and the u and z are frame units. A method for operating a hybrid automatic repeat request (HARQ) in a wireless mobile communication system using frames consisting of a plurality of subframes for communication in accordance with a frequency division multiplexing (FDD) method, Data burst allocation information is transmitted through DL downlink (DL) subframe of frame i and data burst through at least one subframe including downlink subframe m of frame i. Receiving the process, After the frame i, transmitting feedback indicating whether the data burst has been successfully received through the n uplink subframe of the frame j; And corresponding to the feedback, receiving a burst of data transmitted or retransmitted through at least one subframe including the m downlink subframe of the k frame. Each frame and subframe is HARQ operation method characterized in that each index is determined by the following table.

In the table, N is the number of frames constituting the superframe, F is the number of subframes constituting each frame, i, j and k is the frame index, l is the subframe index provided with the data burst allocation information M is a subframe index at which the transmission of the data burst starts, n is a subframe index at which the feedback is transmitted, z is a downlink HARQ feedback offset, u is a downlink HARQ transmission offset, and N _{A - MAP} means a period in which the data burst allocation information is provided, and when the data burst allocation information is provided in every downlink subframe, N _{A - MAP} = 1 and the data at two downlink subframe intervals. When burst allocation information is provided, N _{A - MAP} = 2, and N _{A - MAP} = 2

being. The method of claim 3, U is determined as 1 when the HARQ transmission processing time exceeds the first reference time interval, and is determined as 0 when the first reference time interval is not exceeded, and z is the second HARQ reception processing time. When the reference time interval is exceeded, it is determined as 1, and when the second reference time interval is not exceeded, it is determined as 0, and the u and z are frame units. A method for operating a hybrid automatic repeat request (HARQ) in a wireless mobile communication system using frames consisting of a plurality of subframes for communication in accordance with a frequency division multiplexing (FDD) method, transmitting data burst assignment information (signature IE) through downlink subframe l of frame i; After the frame i, receiving a data burst through at least one subframe including the uplink subframe m of frame j; After the j frame, transmitting feedback indicating whether the data burst has been successfully received through the l downlink subframe of the k frame; In response to the feedback, receiving a burst of data transmitted or retransmitted through at least one subframe including the downlink subframe of m of the p frame; Each frame and subframe is HARQ operation method characterized in that each index is determined by the following table.

In the table, N means the number of frames constituting the superframe, F means the number of subframes constituting each frame, i, j, k and p means the frame index, l is the data burst Allocation information or a subframe index provided with the feedback, m means a subframe index from which the transmission of the data burst starts, w means an uplink HARQ feedback offset, and v means a downlink HARQ transmission offset N _{A - MAP} means a period in which the data burst allocation information is provided, and when the data burst allocation information is provided in every downlink subframe, N _{A - MAP} = 1, and two downlink sub when the frame interval to be provided by the data burst allocation information N _{a -} and _MAP = 2, N _{a -} if the _MAP = 2

being. The method of claim 5, The v is determined as 1 when the HARQ transmission processing time exceeds the first reference time interval, and is determined as 0 when the second reference time interval is not exceeded, and w is the second HARQ receiving processing time. When the reference time interval is exceeded, it is determined as 1, and when the second reference time interval is not exceeded, it is determined as 0, and v and w are frame units. A method for operating a hybrid automatic repeat request (HARQ) in a wireless mobile communication system using frames consisting of a plurality of subframes for communication in accordance with a frequency division multiplexing (FDD) method, receiving data burst allocation information transmitted through DL downlink (DL) subframe of frame i, and Transmitting the data burst after the frame i through at least one subframe including the uplink subframe m of frame j; Receiving the feedback on the data burst through the l downlink subframe of the k frame after the j frame; In response to the feedback, transmitting or retransmitting a data burst through at least one subframe including the uplink subframe m of the p frame. Each frame and subframe is HARQ operation method characterized in that each index is determined by the following table.

In the table, N means the number of frames constituting the superframe, F means the number of subframes constituting each frame, i, j, k and p means the frame index, l is the data burst Allocation information or a subframe index provided with the feedback, m means a subframe index from which the transmission of the data burst starts, w means an uplink HARQ feedback offset, and v means a downlink HARQ transmission offset N _{A - MAP} means a period in which the data burst allocation information is provided, and when the data burst allocation information is provided in every downlink subframe, N _{A - MAP} = 1, and two downlink sub When the data burst allocation information is provided at the frame interval, N _{A - MAP} = 2, and when N _{A - MAP} = 2,

being. The method of claim 7, wherein The v is determined as 1 when the HARQ transmission processing time exceeds the first reference time interval, and is determined as 0 when the first reference time interval is not exceeded, and w is the second HARQ receiving processing time. When the reference time interval is exceeded, it is determined as 1, and when the second reference time interval is not exceeded, it is determined as 0, and v and w are frame units. A method for operating a hybrid automatic repeat request (HARQ) in a wireless mobile communication system using frames consisting of a plurality of subframes for communication according to a time division multiplexing (TDD) method, Data burst allocation information is transmitted through DL downlink (DL) subframe of frame i and data burst through at least one subframe including downlink subframe m of frame i. Sending a message, Receiving the feedback on the data burst through the n uplink subframe of the j frame after the i frame; In response to the feedback, transmitting or retransmitting a data burst through at least one subframe including the m downlink subframe of the k frame. Each frame and subframe is HARQ operation method characterized in that each index is determined by the following table.

In the above table, D means the number of subframes constituting the DL interval in each frame, U means the number of subframes constituting the UL interval in each frame, N is the number of frames constituting one superframe I, j and k mean a frame index, l means a subframe index where the data burst allocation information is transmitted, m means a subframe index where the data burst transmission starts, n denotes a subframe index in which the feedback is transmitted, z denotes a downlink HARQ feedback offset, u denotes a downlink HARQ transmission offset, and N _{A - MAP} is a period in which the data burst allocation information is provided. the means, and if provided, the data burst allocation information per downlink sub-frame N _{a -} and _MAP = 1, two and effort subframe interval If provided in which the data burst allocation information N _{A -} and _MAP = 2, N _{A -} if the _MAP = 2

K has a value of K _c or K _f defined as in the following equation.

10. The method of claim 9, U is determined to be 1 when the HARQ transmission processing time exceeds the first reference time interval, and is determined to be 0 when the second reference time interval is not exceeded, and z is the second HARQ reception processing time. When the reference time interval is exceeded, it is determined as 1, and when the second reference time interval is not exceeded, it is determined as 0, and the u and z are frame units. A method for operating a hybrid automatic repeat request (HARQ) in a wireless mobile communication system using frames consisting of a plurality of subframes for communication according to a time division multiplexing (TDD) method, Data burst assignment information transmitted through downlink subframe l of frame i is transmitted and data transmitted through at least one subframe including downlink subframe m of frame i Receiving bursts, After the frame i, transmitting feedback indicating whether the data burst has been successfully received through the n uplink subframe of the frame j; And corresponding to the feedback, receiving a burst of data transmitted or retransmitted through at least one subframe including the m downlink subframe of the k frame. Each frame and subframe is HARQ operation method characterized in that each index is determined by the following table.

In the above table, D means the number of subframes constituting the DL period in each frame, U means the number of subframes constituting the UL period in each frame, N means the number of frames constituting the superframe I, j and k denote a frame index, l denotes a subframe index in which the data burst allocation information is transmitted, m denotes a subframe index in which the data burst transmission starts, and n denotes It means a subframe index in which the feedback is transmitted. Z denotes a downlink HARQ feedback offset, u denotes a downlink HARQ transmission offset, and N _{A - MAP} denotes a period in which the data burst allocation information is provided, and the data in every downlink subframe When burst allocation information is provided, N _{A - MAP} = 1, when the data burst allocation information is provided in two downlink subframe intervals, N _{A - MAP} = 2, and N _{A - MAP} = 2

K has values of K _c and K _f defined as in the following equation.

The method of claim 11, U is determined as 1 when the HARQ transmission processing time exceeds the first reference time interval, and is determined as 0 when the first reference time interval is not exceeded, and z is the second HARQ reception processing time. When the reference time interval is exceeded, it is determined as 1, and when the second reference time interval is not exceeded, it is determined as 0, and the u and z are frame units. A method for operating a hybrid automatic repeat request (HARQ) in a wireless mobile communication system using frames consisting of a plurality of subframes for communication according to a time division multiplexing (TDD) method, transmitting data burst assignment information (signature IE) through downlink subframe l of frame i; After the frame i, receiving a data burst through at least one subframe including the uplink subframe m of frame j; After the j frame, transmitting feedback indicating whether the data burst has been successfully received through the l downlink subframe of the k frame; And corresponding to the feedback, receiving a burst of data transmitted or retransmitted through at least one subframe including uplink subframe m in frame p. Each frame and subframe is HARQ operation method characterized in that each index is determined by the following table.

In the above table, D means the number of subframes constituting the DL interval in each frame, U means the number of subframes constituting the UL interval in each frame, N is the number of frames constituting one superframe I, j and k mean a frame index, and l means a subframe index where the data burst allocation information or the feedback is transmitted, and m denotes a subframe index where the data burst transmission starts. W denotes an uplink HARQ feedback offset, v denotes a downlink HARQ transmission offset, and N _{A - MAP} denotes a period in which the data burst allocation information is provided, and in each downlink subframe When data burst allocation information is provided, N _{A - MAP} = 1, and the data burst allocation information is provided at intervals of two downlink subframes. If a _MAP = 2, the N _A-MAP = 2, _- if provided, N _A

K has a value of K _c or K _f defined as in the following equation.

The method of claim 13, The v is determined as 1 when the HARQ transmission processing time exceeds the first reference time interval, and is determined as 0 when the first reference time interval is not exceeded, and w is the second HARQ receiving processing time. When the reference time interval is exceeded, it is determined as 1, and when the second reference time interval is not exceeded, it is determined as 0, and v and w are frame units. A method for operating a hybrid automatic repeat request (HARQ) in a wireless mobile communication system using frames consisting of a plurality of subframes for communication according to a time division multiplexing (TDD) method, receiving data burst allocation information transmitted through DL downlink (DL) subframe of frame i, and Transmitting the data burst after the frame i through at least one subframe including the uplink subframe m of frame j; Receiving the feedback on the data burst through the l downlink subframe of the k frame after the j frame; In response to the feedback, transmitting or retransmitting a data burst through at least one subframe including the uplink subframe m of the p frame. Each frame and subframe is HARQ operation method characterized in that each index is determined by the following table.

In the above table, D means the number of subframes constituting the DL interval in each frame, U means the number of subframes constituting the UL interval in each frame, N is the number of frames constituting one superframe I, j and k mean a frame index, and l means a subframe index where the data burst allocation information or the feedback is transmitted, and m denotes a subframe index where the data burst transmission starts. W denotes an uplink HARQ feedback offset, v denotes a downlink HARQ transmission offset, and N _{A - MAP} denotes a period in which the data burst allocation information is provided, and in each downlink subframe When data burst allocation information is provided, N _{A - MAP} = 1, and the data burst allocation information is provided at intervals of two downlink subframes. If a _MAP = 2, the N _A-MAP = 2, _- if provided, N _A

K has a value of K _c or K _f defined as in the following equation.

The method of claim 15, The v is determined as 1 when the HARQ transmission processing time exceeds the first reference time interval, and is determined as 0 when the first reference time interval is not exceeded, and w is the second HARQ receiving processing time. When the reference time interval is exceeded, it is determined as 1, and when the second reference time interval is not exceeded, it is determined as 0, and v and w are frame units. The method according to any one of claims 9 to 16, D and U are HARQ operation method, characterized in that the number of downlink subframes and uplink subframes used for direct communication between the base station and the mobile station or between the relay station and the mobile station, respectively. The method according to any one of claims 1 to 16, If the number of subframes used for transmission of the data burst is two or more, determining the index of the frame and subframe to which the feedback is transmitted using the index of the last subframe in which the data burst is transmitted. HARQ operating method, characterized in that. The method according to any one of claims 1 to 16, When the number of subframes used for the transmission of the data burst is two or more, the index of the subframe in which the transmission of the data burst starts or the data burst according to the ratio of the D and the U and the transmission and reception processing time. And determining the index of the frame and subframe through which the feedback is transmitted by using the index of the last subframe in which is transmitted. The method according to any one of claims 1 to 16, Each of the indexes of the subframe is HARQ operation method, characterized in that the rearranged subframe index in the interval operating in the IEEE 802.16m mode.

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